HK1110659B - Display device and calendar device of timepiece - Google Patents

Description

Display device and calendar device of clock

Technical Field

The present invention relates to a display device and a calendar device of a timepiece. In particular, the present invention relates to a display device and a calendar device of a clock which can display large characters and numbers.

Background

In the following description, a case where a calendar device using a clock displays calendar information with date in a clock with a large number will be described as an example of a display device.

Conventionally, in order to enable a large calendar display from a display window for calendar, it has been considered to share a calendar display with two date disks and to display calendar characters on the date disks from a display window for calendar provided on a dial plate. By making one of the two date plates stationary and making the other advance, and then making one advance and making the other stationary, it is possible to display characters on the two date plates. This can be found in swiss patent No. CH660941B5 (fig. 1, fig. 3).

Further, this idea can be found in japanese patent laid-open nos. 2005-156562 (fig. 4, 5, and 6) and 2005-156563 (fig. 2, 3, and 4) which are disclosed later than the priority date of the present application.

In the above 3 patent documents, it is common that the upper date plate of the two date plates includes 16 sectors and the lower date plate includes 17 sectors. Therefore, the number of teeth of the upper and lower date indicator disks is also 16 and 17, respectively, and is different. The 1-tooth difference is assumed to make the positional relationship of the teeth of the upper and lower date indicator different (offset) in a plane.

Therefore, as seen in CH660941B5 (fig. 1), japanese patent laid-open publication No. 2005-156562 (fig. 7) and 2005-156563 (fig. 5) which are published after the priority date of the present application, the lever needs to have two shapes, i.e., an upper date indicator and a lower date indicator, whose planar positions are also deviated. Therefore, a larger space and a complicated structure are required.

Further, if the arrangement position of the drive wheel is secured at the portion where the plane of the 1 tooth of the upper date indicator and the plane of the 1 tooth of the lower date indicator overlap, the tooth portion overlapping on the plane cannot be found, and the position of the date correction (correction) wheel cannot be obtained. Therefore, it is proposed that the date correction mechanism is not provided in the first swiss patent No. CH660941B5 (fig. 1) and japanese laid-open patent publication No. 2005-156563 (fig. 6) published after the priority date of the present application. When the date of the clock is different from the current date due to the end of a month of a small month, the start of the clock, or the replacement of the battery, a date correction mechanism for fast forwarding the date dial is necessary to make the date coincident, and there is a problem that the correction operation is complicated and inconvenient without the date correction mechanism. Therefore, in japanese patent laid-open No. 2005-156562 (fig. 8), the tooth portions having different positions (pitches) are superimposed on the tooth portion of the lower date indicator to form a two-piece tooth structure. This complicates the structure of the lower date indicator.

Disclosure of Invention

The present invention has been made in an effort to provide a display device and a calendar device of a timepiece capable of solving the problems of the related art and displaying a large amount of information.

In order to solve the above-described technical problem, in the present invention, there is provided a display device including: a first display wheel having a display portion for displaying a partial period of information and a plurality of teeth portions for being driven; a second display wheel having a display portion for displaying a period other than the period displayed by the first display wheel, an opening portion for exposing the first display wheel, and a plurality of teeth portions for being driven, the second display wheel being disposed to overlap the first display wheel; and a driving pawl for rotationally driving the first display wheel and the second display wheel; a display device including a display wheel drive control unit that displays information by driving the first display wheel and the second display wheel by the driving pawl every predetermined period and exposing the display portion of one display wheel from a window; the tooth part of the first display wheel and the tooth part of the second display wheel have the same number of teeth; the display wheel drive control unit includes: an engagement state generating mechanism that generates a first engagement state in which the drive pawl is engaged with the tooth portion of the first display wheel and the drive pawl is not engaged with the tooth portion of the second display wheel when the display portion of the first display wheel displays the information of the partial period through the opening portion of the second display wheel and the window, and generates a second engagement state in which the drive pawl is engaged with the tooth portion of the second display wheel and the drive pawl is not engaged with the tooth portion of the first display wheel when the display portion of the second display wheel displays the information of the other period through the window; and an engagement state switching mechanism for switching an engagement state of the drive pawl with respect to the tooth portions of the first indicator wheel and the second indicator wheel to switch the first engagement state and the second engagement state with each other; the meshing state generating mechanism includes an idle rotation generating portion that idly swings one display wheel by the driving pawl to stop one of the first display wheel and the second display wheel and drives only the other display wheel, depending on whether or not a non-toothed portion provided on the toothed portion of at least one of the first display wheel and the second display wheel is located within a driving locus of the driving pawl; the non-toothed portion is a thin toothed portion in which a part of the thickness direction of the toothed portion is cut off.

This makes it possible to increase the size of information display, to make the display easy to see, and to further reduce the size and simplify the structure. In the display device having such a configuration, the display wheel drive control unit including the meshing state generating mechanism for generating the first and second meshing states and the meshing state switching mechanism can realize a display in which the information display is enlarged and easily viewed while further downsizing and simplification of the structure are realized. Further, if the display device having such a configuration is used, it is possible to realize a display in which the information display is enlarged and easily observed while further downsizing and simplification of the structure are achieved, and if the display device is used in which the non-toothed portion is a thin toothed portion in which a part of the thickness direction of the toothed portion is cut off or a non-toothed portion in which the entire area of the toothed portion is cut off, it is possible to realize a display in which the information display is enlarged and easily observed while further downsizing and simplification of the structure are achieved.

Further, the meshing state switching mechanism includes a simultaneous driving mechanism that simultaneously drives the first display wheel and the second display wheel to move the position of the thin tooth portion within the driving locus of the driving pawl; with such a display device, it is possible to realize a display in which the information display is enlarged and easily viewed while further downsizing and simplification of the structure are achieved.

The number of teeth of the tooth portion of the first display wheel is 17, and the display portion of the first display wheel has 17 days to 31 days in the day period and two non-information portions continuously provided between 17 days and 31 days; the number of teeth of the tooth portion of the second display wheel is 17 teeth, and the display portion of the second display wheel has 1 day to 16 days of the day period and the opening portion provided between 1 day and 16 days; in each date feeding from 1 to 15 days, only the second display wheel is driven by the driving pawl; in the date feeding from 15 to 16 days and from 16 to 17 days, the first display wheel and the second display wheel are driven simultaneously; in each date feeding from 17 to 31 days, only the first display wheel is driven by the driving pawl; in the date feeding from 31 days to 1 day, the first display wheel and the second display wheel are driven simultaneously; with such a display device, it is possible to realize a display in which the information display is enlarged and easily viewed while further downsizing and simplification of the structure are achieved.

In this case, if the display device is configured such that the number of simultaneous driving operations of the simultaneous driving mechanism is increased by 1 to the number of non-information portions, it is possible to realize a display in which the information display is enlarged and easily viewed while further downsizing and simplification of the structure are achieved.

Further, if the simultaneous driving mechanism is a display device in which the projections provided on the respective display wheels and the grooves engaged with the projections are provided, it is possible to realize a display in which the information display is enlarged and easily viewed while further downsizing and simplification of the structure are achieved.

The driving pawl includes a first driving pawl for driving the tooth portion of the first display wheel and a second driving pawl for driving the tooth portion of the second display wheel; the meshing state generating mechanism is a path switching mechanism for disengaging the second driving pawl from a driving path when the first driving pawl drives the tooth portion of the first display wheel, so as to avoid meshing between the tooth portion of the second display wheel and the second driving pawl; with such a display device, the information display can be enlarged to be easily viewed, and further downsizing and simplification of the structure can be achieved.

The first drive pawl and the second drive pawl are drive pawls each having at least one contact portion that contacts the tooth portion; a clock mechanism which appears in a drive region of the first drive pawl during a predetermined period of time when the tooth portion of the first display wheel is driven, and which switches a drive path of the second drive pawl to an avoidance path by making contact with the contact portion of the first drive pawl; such a display device can promote further miniaturization and simplification.

In this case, if the display device is configured such that the first driving pawl and the second driving pawl are integrally formed, further downsizing and simplification can be achieved.

Further, if the timepiece structural member is a display device having the tooth portion of the first display wheel, further downsizing and simplification can be achieved.

The first display wheel and the second display wheel are configured to rotate in substantially the same path; the first drive pawl and the second drive pawl are configured to integrally rotate with respect to a predetermined rotation center; arranging the engaging portion of the first driving pawl at a position closer to the tooth portions of the first display wheel and the second display wheel than the engaging portion of the second driving pawl; if such a display device is formed, the structure can be simplified.

The first display wheel and the second display wheel are configured to rotate in substantially the same path; the first drive pawl and the second drive pawl are configured to integrally rotate with respect to a predetermined rotation center; a length from the predetermined rotation center to the engagement portion of the first drive pawl is formed longer than a length from the predetermined rotation center to the engagement portion of the second drive pawl; if such a display device is formed, the structure can be simplified as well.

Further, a toothless portion for allowing the tooth portion of the first display wheel to be swung in an idle manner and avoiding engagement with the first drive pawl is provided on the tooth portion of the first display wheel located in the drive path of the first drive pawl in accordance with a predetermined period during which the second drive pawl drives the tooth portion of the second display wheel; if such a display device is formed, the structure can be simplified.

Further, the second drive pawl is positioned in the drive path engaged with the toothed portion of the second display wheel by the abutment portion of the first drive pawl entering the non-toothed portion; such a display device can be constructed in a simplified manner.

Further, the first and second drive pawls have elongated holes whose rotational centers are variable with respect to a predetermined axis, and are urged toward the tooth portions of the first and second indicator wheels by spring members; with such a display device, reliable operation can be achieved with a compact structure.

In addition, the display device is provided with a correction wheel having a drive pawl for correcting and driving the teeth of the first display wheel and the second display wheel, and the display device having such a configuration can realize a correction mechanism.

The drive pawl of the correction wheel is configured to have a third drive pawl for correcting and driving the tooth portion of the first display wheel and a fourth drive pawl for correcting and driving the tooth portion of the second display wheel, and to be integrally rotationally driven with respect to a predetermined rotational center; the engaging portion of the third driving pawl is disposed closer to the tooth portions of the first display wheel and the second display wheel than the engaging portion of the fourth driving pawl; with such a display device, the correction mechanism can be realized with a simple configuration.

The drive pawl of the correction wheel is configured to have a third drive pawl for correcting and driving the tooth portion of the first display wheel and a fourth drive pawl for correcting and driving the tooth portion of the second display wheel, and to be integrally rotationally driven with respect to a predetermined rotational center; a length from the predetermined rotation center to an engagement portion of the third drive pawl is formed longer than a length from the predetermined rotation center to an engagement portion of the fourth drive pawl; with such a display device, the correction mechanism can be realized with a simple configuration as well.

A toothless portion for avoiding engagement with the third driving pawl is provided on the toothed portion of the first display wheel located in the driving path of the third driving pawl in correspondence with the predetermined period during which the fourth driving pawl drives the toothed portion of the second display wheel in a correcting manner; with such a display device, the correction drive structure can be simplified.

Further, if a display device is provided in which at least one of the third drive pawl and the fourth drive pawl is provided with a contact portion that contacts with the tooth portions of the first display wheel and the second display wheel, the correction drive structure can be simplified.

Further, if the display device is configured such that the contact portion of the third drive pawl enters the toothless portion and the fourth drive pawl is guided to the drive path that engages with the toothed portion of the second display wheel, the correction drive structure can be simplified.

Further, if a display device is provided in which the third driving pawl and the fourth driving pawl have a commutator mechanism in which the position of the rotation center is variable with respect to a predetermined axis, the correction driving structure can be simplified.

Further, if the display device is configured such that the first display wheel includes the first non-toothed portion for avoiding the engagement with the first drive pawl and the second non-toothed portion for avoiding the engagement with the third drive pawl, the integration of the drive structure and the correction drive structure of the display wheel can be realized with a simple structure.

Further, if the display device is configured such that the first toothless portion is provided on the upper side of the tooth portion of the first display wheel and the second toothless portion is provided on the lower side of the tooth portion of the first display wheel, the driving structure of the display wheel and the correction driving structure can be integrated with each other with a simple structure.

The number of teeth of the tooth portion of the first display wheel is 16, and the display portion of the first display wheel has 16 to 31 days in the day period; the number of teeth of the tooth portion of the second display wheel is 16, and the display portion of the second display wheel has 1 to 15 days of the day and the opening portion provided between 1 and 15 days; in each date feeding from 1 to 15 days, the first driving pawl causes the first non-toothed portion of the first display wheel to swing idly, and only the second display wheel is driven by the second driving pawl; simultaneously driving the first display wheel and the second display wheel by a simultaneous driving mechanism in date feeding from 15 days to 16 days; in each date feeding from 17 to 31 days, the second drive pawl is separated from the tooth portion of the second display wheel by the abutment portion abutting against the tooth portion of the first display wheel, and only the first display wheel is driven by the first drive pawl; in the date feeding from 31 to 1, the contact part and the first driving pawl enter the first non-toothed part, and only the second display wheel is driven by the second driving pawl; with such a display device, it is possible to increase the size of information display, to realize easy-to-see display, to further reduce the size and simplify the structure, and to integrate the drive structure of the display wheel with the correction drive structure with a simple structure.

The number of teeth of the tooth portion of the first display wheel is 16, and the display portion of the first display wheel has 16 to 31 days in the day period; the number of teeth of the tooth portion of the second display wheel is 16, and the display portion of the second display wheel has 1 to 15 days of the day and the opening portion provided between 1 and 15 days; in each correction from 1 to 15 days, the third driving pawl causes the second toothless portion to swing idly, and only the second indicator wheel is driven by the fourth driving pawl; simultaneously driving the first display wheel and the second display wheel by a simultaneous driving mechanism during the correction from 15 days to 16 days; in each correction from day 17 to day 31, the fourth drive pawl is separated from the tooth portion of the second display wheel by the abutment portion abutting against the tooth portion of the first display wheel, and only the first display wheel is driven by the third drive pawl; in the correction from 31 th to 1 th day, an abutting portion and the third driving pawl enter the second toothless portion, and only the second display wheel is driven by the fourth driving pawl; with such a display device, it is possible to increase the size of information display, to realize easy-to-see display, to further reduce the size and simplify the structure, and to integrate the drive structure of the display wheel with the correction drive structure with a simple structure.

In addition, in the case where the display device is a calendar device of a timepiece, it is possible to make the calendar display large, realize a display easy to observe, and further miniaturize and simplify the structure.

Drawings

Fig. 1 is a plan view of a calendar device of a timepiece as a display device of a first embodiment of the present invention, with a dial removed and a second day wheel (upper day wheel) partially removed. The first day wheel (lower day wheel) is in a normal drive state and the correction wheel is in a non-operation state. The calendar window of the dial is in the position of 12 hours in this example (i.e. the letter "26" on the first date wheel of fig. 1 is shown).

Fig. 2 is a top partial view of the calendar device of the timepiece of fig. 1, showing a second day wheel normally driven state.

Fig. 3 shows a cross-sectional view taken along line X3-X3 of fig. 2.

Fig. 4 is a top partial view of the calendar device of the timepiece of fig. 1, showing a first date indicator normal driving state.

Fig. 5 shows a cross-sectional view taken along line X5-X5 of fig. 4.

Fig. 6 is a plan view illustrating a state in which the day wheel of the calendar device of the timepiece of fig. 1 is normally driven, showing a state of display for 1 day, and also schematically showing a state of the simultaneous driving mechanism.

Fig. 7 is a plan view illustrating a state in which the day wheel of the calendar device of the timepiece of fig. 1 is normally driven, showing a state of 15-day display, and also schematically showing a state of the simultaneous driving mechanism.

Fig. 8 is a plan view illustrating a state in which the day wheel of the calendar device of the timepiece of fig. 1 is normally driven, showing a state of 16-day display, and also schematically showing a state of the simultaneous driving mechanism.

Fig. 9 is a plan view illustrating a state in which the day wheel of the calendar device of the timepiece of fig. 1 is normally driven, showing a state of display for 17 days, and also schematically showing a state of the simultaneous driving mechanism.

Fig. 10 is a plan view illustrating a state in which the day wheel of the calendar device of the timepiece of fig. 1 is normally driven, showing a state of displaying 30 days, and also schematically showing a state of the simultaneous driving mechanism.

Fig. 11 is a plan view illustrating a state in which the day wheel of the calendar device of the timepiece of fig. 1 is normally driven, showing a state of display for 31 days, and also schematically showing a state of the simultaneous driving mechanism.

Fig. 12 is a top partial view of the calendar device of the timepiece of fig. 1, showing a modified state of the second day wheel (upper day wheel).

FIG. 13 shows a cross-sectional view taken along line Y13-Y13 of FIG. 12.

Fig. 14 is a top partial view of the calendar device of the timepiece of fig. 1, showing a modified state of the first day wheel (lower day wheel).

FIG. 15 shows a cross-sectional view taken along line Y15-Y15 of FIG. 14.

Fig. 16 is a plan view of a calendar device of a timepiece as a display device of a second embodiment, in which a dial plate is removed from a plan view of the whole of the calendar device. The normal driving state of the second day wheel (upper day wheel) and the operation start state of the correction wheel are shown. The calendar window of the dial is in the position of 12 hours in this example (i.e. the letter "26" on the first date wheel shown in fig. 16 is shown).

Fig. 17 is a top partial view of the calendar device of the timepiece of fig. 16, showing a normal driving state (second engagement state) of the second day wheel.

Fig. 18 shows a cross-sectional view taken along line X7-X7 of fig. 17.

Fig. 19 is a sectional view of the calendar device of the timepiece of fig. 16, which is the same as fig. 18, showing a normal driving state (first engagement state) of the first day wheel.

Fig. 20 is a plan view illustrating a normal driving state of the day wheel of the calendar device of the timepiece of fig. 16, showing a state of 1 day display, and also schematically showing a state of the simultaneous driving mechanism.

Fig. 21 is a plan view illustrating a state of driving the day wheel of the calendar device of the timepiece of fig. 16, showing a state of displaying 15 days, and also schematically showing a state of the simultaneous driving mechanism.

Fig. 22 is a plan view illustrating a normal driving state of the day wheel of the calendar device of the timepiece of fig. 16, showing a state of displaying 16 days, and also schematically showing a state of the simultaneous driving mechanism.

Fig. 23 is a plan view illustrating a state of driving the day wheel of the calendar device of the timepiece of fig. 16 in a normal state, showing a state of displaying day 17, and also schematically showing a state of the simultaneous driving mechanism.

Fig. 24 is a plan view illustrating a normal driving state of the day wheel of the calendar device of the timepiece of fig. 16, showing a state of display for 31 days and also schematically showing a state of the simultaneous driving mechanism.

Fig. 25 is a top partial view of the calendar device of the timepiece of fig. 16, showing a modified state of the second day wheel (upper day wheel).

Fig. 26 shows a sectional view taken along line Y17-Y17 of fig. 25, in a modified state of the second day wheel.

Fig. 27 is a sectional view similar to fig. 26 in a state where the first day wheel (lower day wheel) is corrected.

Fig. 28 is an explanatory diagram illustrating an operation principle of a calendar of the calendar device of the timepiece of the second embodiment shown in fig. 16.

Detailed Description

Hereinafter, embodiments of the present invention will be described by way of examples with reference to the drawings.

(first embodiment)

Fig. 1 to 15 are views relating to the first embodiment.

(1) Fig. 1 is a plan view of a calendar device as a timepiece according to a first embodiment of the present invention, with a dial and a pressure plate removed and a second day wheel (here, an upper day wheel) partially removed.

The calendar device 2 of the timepiece 1 of this embodiment includes two superposed first date indicator 10 as a first display wheel, second date indicator 20 as a second display wheel, a date dial mechanism 26M, a date wheel drive control unit (in this example, a date turning mechanism) 30M, and a date correction mechanism 50M.

(2) First, the configuration of the day wheels 10 and 20, the date dial mechanism 26M, and the day wheel drive control unit (in this example, the date turning mechanism) 30M according to this embodiment will be described with reference to fig. 1 to 5. The overall plan view of the calendar device of the timepiece of fig. 1 shows a normal drive state of the first day wheel 10 (here, the lower day wheel, and the same applies hereinafter) and a non-operation state of the correction wheel 50. The dial display window (which may be referred to as a calendar window dial window) 100 is in this example in the position of 12 hours (i.e., showing the letter "26" on the first day wheel 10 of fig. 1). Fig. 2 is a top view of the calendar device of the timepiece of fig. 1, showing a normal driving state of the second day wheel 20 (here, the upper day wheel, the same applies hereinafter). Fig. 3 shows a cross-sectional view taken along line X3-X3 of fig. 2. Fig. 4 is a top partial view of the calendar device of the timepiece of fig. 1, showing a normal driving state of the first day wheel 10. Fig. 5 shows a cross-sectional view taken along line X5-X5 of fig. 4. In fig. 3 and 5 (also fig. 13 and 15) which are cross-sectional views, a platen 4 for pressing a date wheel or the like is shown.

(a) A first day wheel 10 and a second day wheel 20

The two overlapping first and second day wheels 10 and 20 include: a ring-shaped first date indicator 10 having a display portion 10b for displaying a period of time for which a part of a calendar is displayed on a surface thereof and a driven tooth portion 10 a; and a second annular day ring (upper day ring) 20 having a display portion 20b for displaying a period in which the first day ring 10 is not displayed on the surface, an opening portion 22 for exposing the first day ring 10, and a driven tooth portion 20 a. The teeth 10a and 10b of the first day wheel 10 and the second day wheel 20 are configured to rotate on the same path on a plane (completely overlap in plan view in the present embodiment).

In the day ring of this embodiment, a first day ring (lower day ring) 10 is provided with a day display from 16 days to 30 days on the upper surface side, and a groove partially interrupted in the middle, here, an arc-shaped groove 12 (schematically shown in a plan view in fig. 6 to 10). The second day wheel (upper day wheel) 20 has an opening 22 from day 1 to day 15, and a projection 24 that enters the arc-shaped groove 12 of the first day wheel 10. In this example, a simultaneous driving mechanism including a sun gear having an arc-shaped groove 12 and a projection 24 is provided, and an engagement state switching mechanism is configured.

In this example, the arc-shaped groove 12 is provided in the first day ring 10 and the projection 24 is provided in the second day ring 20, but the arc-shaped groove 12 may be provided in the second day ring 20 and the projection 24 may be provided in the first day ring 10 in reverse.

The toothed portion 10a of the first date indicator (lower date indicator) 10 includes a first non-toothed portion 10c (shown in fig. 2 and 3) into which a first drive pawl 35 and a subsequent contact portion 34 of a date indicator 30 described later enter when the display of 31 days is positioned below the display window 100 of the dial. When the display of the day wheel is changed from 31 days to 1 day by the first non-toothed part 10c, the first day wheel (lower day wheel) 10 is not fed, but the toothed part 20a of the second day wheel (upper day wheel) 20 is fed to 1 day by the second drive pawl 37. In this example, the null pendulum generating portion is configured to include the first non-toothed portion 10 c.

Further, as described later, due to the relationship with the correction wheel 50, similarly, the toothed portion 10a of the first day wheel (lower day wheel) 10 includes the second toothless portion 10d (shown in fig. 12 and 13) into which the third drive pawl 55 and the immediately adjacent contact portion 54 enter when the display of 31 days is positioned below the display window (window of the dial) 100 of the dial. When the display of the 1 date correction day wheel is performed from 31 days, the fourth driving claw 57 does not feed the first day wheel (lower day wheel) 10 but feeds the tooth portion 20a of the second day wheel (upper day wheel) 20 to 1 day by the second non-tooth portion 10 d. The first and second toothless portions 10c and 10d of the first day wheel 10 of the present embodiment are not a structure in which teeth are cut off, but only the teeth are thinned in the thickness direction, but the teeth exist over the entire day wheel.

(b) Date dial mechanism 26M

The date dial mechanism 26M has two date dials 26, 26 of the same shape for dialing two date wheels, and the date dials 26, 26 are arranged to overlap each other. The first and second sun gears 10 and 20 include: date levers 26, 26 which are contacted by the mountain-shaped lever portions 26a, and the spring portions 26c, 26c are extended to the opposite side with the rotation shaft 26b as the center; and a pressing portion 28 which abuts against the end portions of the spring portions 26c, 26c and is fixed to the substrate (here, the bottom plate 3); the above structure shifts the first day wheel 10 and the second day wheel 20. In this way, since the two date levers 26 and 26 having the same shape are arranged to overlap each other, the date levers 26 and the date dial mechanism 26M can be miniaturized on a plane. The first and second toothless portions 10c and 10d of the first day ring 10 of the present embodiment are not a structure in which the toothless portions are cut off, but only the toothless portions are thinned in the thickness direction, and the date dials 26 and 26 may be engaged between one toothless portion of the first and second day rings 10 and 20, and a lever having a general shape other than a special shape may be used.

(c) A day wheel drive control unit (in this example, a date turning mechanism) 30M

The day wheel drive control unit (in this example, the date turning mechanism) 30M includes a date turning wheel 30, a drive pawl (here, a date turning pawl) 33 placed on the date turning wheel 30 and rotationally driving the first day wheel 10 and the second day wheel 20, and a path switching mechanism 40 (here, including a contact portion 34 formed close to the date turning pawl 33 and a tooth portion 10a of the first day wheel 10 in contact therewith). The drive pawl (here, the date turning pawl) 33 causes the long hole 33c to be fitted to the shaft 30a of the date turning wheel 30, and causes the locking wall 33e to engage with the pin 30c of the date turning wheel 30. The drive pawl (here, the date turning pawl) 33 includes a first drive pawl 35 that drives the tooth portion 10a of the first day wheel 10 and a second drive pawl 37 that drives the tooth portion 20a of the second day wheel 20, and the first drive pawl 35 and the second drive pawl 37 are integrally configured, and here, the drive pawl includes the contact portion 34 that is a part of the path switching mechanism 40 as described above.

The second day wheel 20 is superposed on the first day wheel 10, and the day wheels are driven every predetermined period, whereby one day wheel surface is exposed from the display window 100 of the dial plate, thereby displaying the calendar. When the first drive pawl 35 drives the tooth 10a of the first day wheel 10, the path switching mechanism 40 disengages the second drive pawl 37 from the drive path so as to avoid the engagement between the tooth 20a of the second day wheel 20 and the second drive pawl 37. This is the first engagement state. The path switching mechanism 40 is a timepiece component (in this example, the tooth portion 10a of the first date indicator 10 as described above) which appears in the drive region of the drive pawl 33 during a predetermined period of time when the tooth portion 10a of the first date indicator 10 is driven, and which contacts the contact portion 34 of the drive pawl 33 to switch the drive path of the second drive pawl 37 to the avoidance path.

The teeth 10a and 20a of the first and second date indicator 10 and 20 are configured to rotate in substantially the same path (here, they are completely overlapped in a plan view), and the first and second drive pawls 35 and 37 are configured to be integrally rotationally driven with respect to a predetermined rotation center (in fig. 1, it is assumed that 33d is shown and it moves through the elongated hole 33 c), and the engagement portion 35a of the first drive pawl 35 is disposed at a position closer to the teeth 10a and 20a of the date indicator 10 and 20 than the engagement portion 37a of the second drive pawl 37. That is, the teeth portions 10a and 20a of the first date indicator 10 and the second date indicator 20 are configured to rotate in substantially the same path, the first drive pawl 35 and the second drive pawl 37 are configured to be integrally rotated and driven with respect to the predetermined rotation center 33d, and the length from the predetermined rotation center 33d to the engagement portion 35a of the first drive pawl 35 is formed longer than the length from the predetermined rotation center to the engagement portion 37a of the second drive pawl 37.

A first toothless portion 10c (shown by a broken line in fig. 1 and 2) for avoiding meshing with the first drive pawl 35 is provided in the toothed portion 10a of the first day wheel 10 located in the drive path of the first drive pawl 35 in accordance with a predetermined period in which the second drive pawl 37 drives the toothed portion 20a of the second day wheel 20. By the abutment portion 34 of the drive pawl 33 entering the first non-toothed portion 10c, the second drive pawl 37 is guided to the drive path meshing with the toothed portion 20a of the second day wheel 20. The first toothless portion 10c is a backlash generating portion that generates backlash of the first drive pawl 35 and meshes the second drive pawl 37 with the toothed portion 20a of the second day wheel 20. Further, this is the second engagement state.

Therefore, in this example, the meshing state generating mechanism that generates the first meshing state and the second meshing state is configured by the path switching mechanism 40 that has the toothless portion 10c and the contact portion 34 and disengages the first drive pawl 35 and the second drive pawl 37 from the drive path.

The meshing state switching mechanism for switching the first and second meshing states from each other has a simultaneous driving mechanism for simultaneously driving the first day ring 10 and the second day ring 20 to move the position of the first non-toothed portion 10c located in the driving locus of the driving pawls 35, 37. The simultaneous drive mechanism engages the arcuate groove 12 of the first day wheel 10 with the projection 24 of the second day wheel 20, and simultaneously feeds the day wheels 10, 20 by the push-pull relationship between the groove wall 14 of the arcuate groove 12 and the projection 24.

The drive pawl 33 has an elongated hole 33c whose rotational center position is changed with respect to a predetermined axis, and is biased toward the tooth portions 10a and 20a of the first date indicator 10 and the second date indicator 20 by a spring member (here, a restricting spring) 38. The regulating spring 38 presses the wall 33b inside the long groove provided in the drive pawl (date turning pawl) 33 by inserting the tip end thereof into the long groove 33a, thereby biasing the drive pawl 33 toward the teeth 10a and 20 a.

The first drive pawl 35 and the second drive pawl 37 may be formed separately. In the case of a separate structure, the rotation centers of the first driving pawl 35 and the second driving pawl 37 may be provided on the date indicator 30, or the first driving pawl 35 may be placed on the date indicator 30 and engaged with the shaft 30a and the elongated hole 33c, and the second driving pawl 37 may be engaged with the shaft provided as the rotation center of the first driving pawl 35. The contact portion 34 may be provided on at least one of the first drive pawl 35 and the second drive pawl 37.

(3) Next, basic operations of the first day wheel 10, the second day wheel 20, and the day wheel drive control unit (in this example, the date turning mechanism) 30M will be described with reference to fig. 1 to 5.

As shown in fig. 2 and 3, in the normal driving state of the second day wheel (upper day wheel) 20, the date turning wheel 30 receives the driving force from the hour wheel 5 rotating in the arrow C direction and rotates in the arrow B direction. The date turning pawl (driving pawl) 33 mounted on the date turning wheel 30 and formed with the long hole 33c also rotates in the arrow B direction. In the normal driving state of the second day wheel (upper day wheel) 20, the abutment portion 34 and the first drive pawl 35 enter the first non-toothed portion 10c of the toothed portion 10a of the first day wheel 10, so that only the toothed portion 20a of the second day wheel (upper day wheel) 20 is sequentially fed from dates 1 to 15 by the second drive pawl 37. The date is switched from 15 to 16 as described later.

As shown in fig. 4 and 5, in a normal state of the first day ring (lower day ring) 10, the date indicator 30 is rotated in the arrow B direction by receiving a driving force from the hour wheel 5 rotated in the arrow C direction. The date turning pawl (driving pawl) 33 mounted on the date turning wheel 30 and formed with the long hole 33c also rotates in the arrow B direction. In the normal driving state of the first date indicator (lower date indicator) 10, since the abutment portion 34 abuts on the tooth portion 10a of the first date indicator (lower date indicator) 10, the second drive pawl 37 is retracted, and the tooth portion 10a of the first date indicator (lower date indicator) 10 is sequentially fed from the dates 16 to 31 by the first drive pawl 35. The date is switched from 31 to 1 as will be described later.

(4) Next, the detailed operation of the first day wheel 10, the second day wheel 20, and the day wheel drive control unit (in this example, the date turning mechanism) 30M will be described with reference to fig. 6 to 11.

In fig. 6 to 11, only the display window 100 is shown with the dial removed. The top view will be described in a state where the day wheel is normally driven, and fig. 6 shows a state of display for 1 day. Fig. 7 shows a state of display for day 15, fig. 8 shows a state of display for day 16, and fig. 9 shows a state of display for day 17. Fig. 10 shows a state of display for day 30, and fig. 11 shows a state of display for day 31. Since the same as the embodiment of fig. 1, the day display window 100 of the dial is at the 12 th position DP on the upper side of the drawing. In the drawings, the positions of an arc-shaped groove 12 provided in a first day wheel (lower day wheel) 10 and a groove wall 14 of a broken portion of the groove are shown. Further, the protrusions 24 provided on the second day wheel (upper day wheel) 20, which engage with the arc-shaped grooves 12, also show corresponding positions in the drawings.

The positions of the teeth 10a and 20a of the date indicator 10 and 20 engaged with the date turning claw 33 are indicated by line F. The positions of the teeth 10a and 20a of the sun wheels 10 and 20 engaged with the correction claws 53 of the correction wheel 50 are indicated by E lines. The positions of the first non-toothed portion 10c and the second non-toothed portion 10d provided on the toothed portion 10a of the first day wheel in the drawings are shown. In fig. 6 to 11, the tooth 10a having the first non-tooth portion 10c is indicated by the symbol "DOWN" above, which indicates that the upper surface of the tooth is cut off and the tooth is provided on the lower surface side, and the tooth 10a having the second non-tooth portion 10d is indicated by the symbol "UP" above, which indicates that the lower surface of the tooth is cut off and the tooth is provided on the upper surface side, so that the understanding is easy. The first toothless portion 10c is related to control for switching drive from the first drive pawl 35 to the second drive pawl 37 at the time of normal date turning, and the second toothless portion 10d is related to control for switching drive from the third drive pawl 55 to the fourth drive pawl 57 at the time of date correction. Arrow a indicates the direction of rotation of the day wheel.

In fig. 6 showing the display state of 1 day of the month, the characters for 1 day of the second day wheel 20 are displayed on the display window 100. At this time, the 31 th day of the first day wheel 10 is located below the 1 st day of the second day wheel on the display window 100. At this time, the first toothless portion 10c of the first date indicator 10 is at the F-line position corresponding to the date turning claw 33. Therefore, in the display feed to the next day of 2 days, as described with reference to fig. 2, the first day wheel 10 is idly swung without being fed by the first drive pawl 35, and only the tooth portion 20a of the second day wheel 20 is driven by the second drive pawl 37, so that the display window 100 displays the display of 2 days. This operation, that is, the operation in which the first day wheel 10 is stopped and only the second day wheel 20 is driven for 1 day, is continued until 15 days shown in fig. 7 are reached.

In fig. 7 showing the display state of 15 days of the month, 15 days are displayed on the display window 100, and 31 days of the first day wheel 10 are present below the display window without moving from the time of fig. 6. The display of the next day of 16 days is below the opening 22 of the second day wheel 20. Immediately behind the groove wall 14 of the circular-arc-shaped groove 12, the projection 24 follows. In the feed from day 15 to day 16, the second drive pawl 37 drives only the tooth 20a of the second day wheel 20, and the projection 24 of the second day wheel 20 presses the groove wall 14 of the arcuate groove 12 of the first day wheel 10, and the second day wheel 20 is also linked with the first day wheel 10, and the state shown in fig. 8 is obtained.

In the first embodiment, the number of simultaneous driving of the first day wheel 10 and the second day wheel 20 is 1.

In fig. 8 showing a display state of 16 days of a month, the opening 22 of the second day wheel 20 is located below the display window 100, and the 16 days of the first day wheel 10 are visible from the display window through the opening 22. Since the first non-toothed portion 10c of the first day wheel 10 is shifted by 1 day in the arrow a direction from the F-line position corresponding to the date turning claw 33, as described with reference to fig. 4, the normal toothed portion 10a of the first day wheel 10 abuts on the abutment portion 34 of the date turning claw 33, the second drive claw 37 is separated from the toothed portion 20a of the second day wheel 20, and the toothed portion 10a of the first day wheel 10 is driven by the first drive claw 35. Therefore, the feed to the next 17 days is only the drive of the tooth portion 10a of the first day wheel 10 by the first drive pawl 35, the second day wheel 20 is not fed, and the opening 22 is stopped at this position.

Fig. 9 shows a display state for day 17. This operation from day 16 to day 17, i.e., the operation in which the second day wheel 20 is stopped and only the first day wheel 10 is driven for 1 day, is continued until day 31 shown in fig. 11 is reached.

Fig. 10 shows a display state for 30 days. The opening 22 of the second day wheel 20 is located below the display window 100, and 30 days of the first day wheel 10 are visible from the display window 100 through the opening 22.

In this state, the first non-toothed portion 10c of the toothed portion 10a of the first day wheel 10 is located 1 tooth before the F-line position. Therefore, the second day ring 20 is stopped, and only the first day ring 10 is driven for 1 day, and the display state of 30 days in fig. 10 is changed to the display state of 31 days in fig. 11.

Fig. 11 shows a display state for 31 days. The opening 22 of the second day wheel 20 is located below the display window 100, and 31 days of the first day wheel 10 are visible from the display window 100 through the opening 22. However, the first no-tooth portion 10c of the tooth portion 10a of the first day wheel 10 reaches the F-line position. Therefore, as shown in fig. 2, when the date turning claw 33 is fed to the next 1 day, since the contact portion 34 provided in the date turning claw 33 and the first driving claw 35 enter the first non-toothed portion 10c, only the second driving claw 37 drives the second day wheel 20, and the display window 100 displays 1 day, the first day wheel 10 is swung idly, and the lower side of the display window 100 is positioned for 1 day. This state is the 1 st display state of fig. 6. Thus, a monthly cycle display is performed.

In the case of a small month, the amount of less than 31 days is corrected by a hand-setting or day correction mechanism.

In order to correct this, when reverse hand setting is performed, the first drive pawl 35 and the second drive pawl 37 of the date turning pawl 33 have a slope portion (shown in fig. 1, 2, and 4) on the side opposite to the feeding direction, and the date turning pawl 33 can be retracted by this slope, so that neither the first day wheel 10 nor the second day wheel 20 rotates in the reverse direction.

(5) Next, the structure of the date correcting mechanism 50M according to the present embodiment will be described with reference to fig. 1 and 12 to 15. Fig. 12 is a top partial view of the calendar device of the timepiece of fig. 1, showing a corrected state of the second day wheel (upper day wheel) 20. FIG. 13 shows a cross-sectional view taken along line Y13-Y13 of FIG. 12. Fig. 14 is a top partial view of the calendar device of the timepiece of fig. 1, showing a corrected state of the first day wheel (lower day wheel) 10. FIG. 15 shows a cross-sectional view taken along line Y15-Y15 of FIG. 14.

The date correction mechanism 50M includes a correction wheel 50, a date correction transmission wheel III63 for transmitting a correction rotational force from the crown 6 via the stem 6a, a date correction transmission wheel II61, and a date correction transmission wheel I59. The date correcting pawl 53 is held by the correcting wheel 50, and the date correcting pawl 53 has a third drive pawl 55 for correcting and driving the tooth portion 10a of the first day wheel 10 and a fourth drive pawl 57 for correcting and driving the tooth portion 20a of the second day wheel 20, and is configured to be integrally rotationally driven with respect to a predetermined rotational center.

The engaging portion 55a of the third drive pawl 55 is disposed closer to the teeth 10a, 20a of the sun gears 10, 20 than the engaging portion 57a of the fourth drive pawl 57. That is, the length from the predetermined rotation center (the axial center of the correction wheel 50) 50a to the engagement portion 55a of the third drive pawl 55 is formed longer than the length from the predetermined rotation center (the axial center of the correction wheel 50) 50a to the engagement portion 57a of the fourth drive pawl 57. The shaft of the correction wheel 50 is vertically fitted into the arc-shaped elongated hole 3c of the bottom plate 3 and the elongated hole 4c of the pressure plate 4 having the same shape as the flat surface thereof, and the shaft of the correction wheel 50 slides in the elongated holes 3c and 4 c.

The second toothless portion 10d for avoiding the meshing with the third drive pawl 55 is provided in the tooth portion 10a of the first day wheel 10 located in the drive path of the third drive pawl 55 in correspondence with the predetermined period in which the fourth drive pawl 57 corrects and drives the tooth portion 20a of the second day wheel 20. The fourth driving pawl 57 is guided to the driving path engaging with the tooth portion 20a of the second day wheel 20 by the abutment portion 54 of the driving pawl (here, the date correcting pawl) 53 entering the second toothless portion 10 d. The third drive pawl 55 and the fourth drive pawl 57 constitute a diverter (リバ - サ) mechanism in which the position of the rotational center of a predetermined shaft (in this embodiment, the shaft 59a of the date correction transmission wheel I59) can be changed, that is, in this example, the diverter mechanism is constituted by the shaft of the correction wheel 50 sliding in the arc-shaped elongated holes 3c, 4 c.

As described above, the first date indicator 10 includes the first toothless portion 10c for avoiding the meshing with the first drive pawl 35 and the second toothless portion 10d for avoiding the meshing with the third drive pawl 55. The first toothless portion 10c removes the upper surface side of the tooth portion 10a of the first day wheel 10 and has a tooth portion on the lower surface side, and the second toothless portion 10d removes the lower surface side of the tooth portion 10a of the first day wheel 10 and has a tooth portion on the upper surface side.

(6) Next, the operation of the date correcting mechanism 50M will be described.

When the date correction transmission wheel II61 and the date correction transmission wheel I59 are rotated in the direction of an arrow G, H, I shown in fig. 1, 12 and 14 via the crown 6, the stem 6a and the date correction transmission wheel III63, the axial direction of the correction wheel 50 is pushed and moved in the direction of the outside of the sun gear toward the elongated holes 4c and 3c (3c is shown in fig. 13) of fig. 12 by the diverter mechanism. In fig. 12 and 13, the second toothless portion 10d of the first day wheel 10 is located opposite the third drive pawl 55. Therefore, in the display from day 1 to day 15, the fourth driving pawl 57 feeds the second day wheel 20 only in order in the arrow a direction of fig. 12. When the display is changed to 15 days, the projection 24 on the back surface of the second day wheel 20 presses the groove wall 14 of the arc-shaped groove 12 of the first day wheel 10, and both the day wheels 10, 20 are fed in an interlocking manner. Thus, as shown in fig. 14 and 15, when the date is shifted from 15 days to 16 days, the position of the second toothless portion 10d up to this point moves instead of the normal toothed portion 10a of the first date indicator 10, so that the contact portion 54 contacts the toothed portion 10a of the first date indicator 10, the fourth drive pawl 57 retracts, and the third drive pawl 55 sequentially shifts the toothed portion 10a of the first date indicator (next date indicator) 10 from 16 days to 31 days. At 31 days, the position of the second toothless portion 10d is returned to the position facing the third drive pawl 55 again, and the feed to the next 1 day is in a state where only the second day ring 20 is fed and the first day ring (lower day ring) 10 is stopped. Until the next 15 days, the same feeding as described above is repeated. Thus, date correction also cycles. In the present embodiment, the structure of the date correction mechanism 50M can be obtained without interfering with the date wheel drive control unit (in this example, the date turning mechanism) 30M.

(second embodiment)

Here, a second embodiment will be described next. Fig. 16 to 28 are views relating to the second embodiment. In the same manner as in the first embodiment, the first and second day wheels are provided with the same number of day display frames (including the opening portions), and the teeth of the first day wheel and the teeth of the second day wheel corresponding to these date display frames have the same number of teeth. However, the number of day display frames (including openings) of each day wheel in the second embodiment is 17, which is different from 16 in the first embodiment. In the second embodiment, since the toothless portion is provided also on the toothed portion of the second day wheel, the day wheel drive control unit (in this example, the date turning mechanism) (particularly, the day wheel drive control unit) and the date correcting mechanism (particularly, the drive pawl) corresponding thereto are simplified, unlike the first embodiment.

The structural elements of the second embodiment corresponding to those of the first embodiment are basically given a reference numeral with "200" added thereto in the case of a numeric reference numeral, and denoted by "2" added thereto in the case of a roman reference numeral.

(1) Fig. 16 is a plan view of the whole of a calendar device of a timepiece as a second embodiment of the present invention, with a dial plate and a pressure plate removed.

The calendar device 202 as the clock 201 of this embodiment includes: a first day wheel 210 (here, a lower day wheel, the same applies hereinafter) as a first display wheel, a second day wheel 220 (here, an upper day wheel, the same applies hereinafter) as a second display wheel, a date dial mechanism 226M, a day wheel drive control unit (in this example, a date turning mechanism) 230M, and a date correction mechanism 250M, which are overlapped with each other.

(2) First, the configuration of the day wheels 210 and 220, the date dial mechanism 226M, and the day wheel drive control unit (in this example, the date turning mechanism) 230M according to this embodiment will be described with reference to fig. 16 to 19. The overall plan view of the calendar device 202 of the timepiece of fig. 16 shows a normal drive state of the first date indicator 210, a state in which the upper date indicator 226 holds the second date indicator 220 at the steady position, a state in which the lower date indicator 226 holds the first date indicator 210 at the steady position, and a non-operation state of the correction wheel 250. The dial display window (window of dial which may be called calendar window) 300 is in the position of 12 hours in this example (i.e. the letter "26" on the first day wheel 210 shown in fig. 16 is displayed). Fig. 17 is a top partial view of the calendar device 202 of the timepiece of fig. 16, showing a normal driving state (second engagement state) of the second day wheel 220. Fig. 18 shows a cross-sectional view taken along line X7-X7 of fig. 17. Fig. 19 is a top view of the same portion as fig. 18 of the calendar device 202 of the timepiece of fig. 16, showing a normal driving state (first engagement state) of the first day wheel 210. In fig. 18 and 19 (also fig. 26 and 27) which are cross-sectional views, a platen 204 for pressing a date indicator or the like is shown.

(a) A first day wheel 210 and a second day wheel 220

The two overlapping first and second day wheels 210 and 220 include: the ring-shaped first day wheel 210 has a display part 210b for displaying a period of a part of the calendar on the surface, a driven tooth part 210a, and a ring-shaped second day wheel (upper day wheel) 220, and has a display part 220b for displaying a period of the first day wheel 210 not being displayed on the surface, an opening 222 for exposing the first day wheel 210, and a driven tooth part 220 a. The teeth 210a and 210b of the first day wheel 210 and the second day wheel 220 are configured to rotate on the same path on a plane (completely overlap in plan view in the present embodiment).

In the day ring of this embodiment, the first day ring (lower day ring) 210 has a day display including two blank portions (calendar-free portions) SP1 and SP2 from 17 to 30 days and a blank space on the upper surface side, and a groove, here an arc-shaped groove 212 (a plane is schematically shown in fig. 20 to 24) partially cut in the middle. The second day wheel (upper day wheel) 220 has an opening 222 for 1 to 16 days, and a projection 224 that enters the arc-shaped groove 212 of the first day wheel 210. In this example, a simultaneous drive mechanism including a sun gear having an arc-shaped groove 212 and a projection 224 constitutes an engagement state switching mechanism.

The tooth portion 210a of the first day wheel (lower day wheel) 210 includes a first non-tooth portion 210c, and when the display of the non-information portion (non-calendar portion) SP1 is positioned below the display window 300 of the dial, a drive pawl 233 of the date turning wheel 230 described later swings with the tooth portion 210a (shown in fig. 17 and 18). By this first non-toothed portion 210c, for example, when changing the day wheel display from 1 day to 2 days, the first day wheel (lower day wheel) 210 is not fed, but the drive pawl 233 is engaged with only the toothed portion 220a of the second day wheel (upper day wheel) 220 and fed to 2 days.

The toothed portion 220a of the second day wheel (lower day wheel) 220 includes a third non-toothed portion 220c, and when the opening 222 is positioned below the display window 300 of the dial, a drive pawl 233 of the date turning wheel 230 described later swings with the toothed portion 220a (shown in fig. 19). By the third non-toothed portion 220c, for example, when the day wheel display is changed from 17 days to 18 days, the toothed portion 220a of the second day wheel (lower day wheel) 220 is not fed, and the drive pawl 233 is engaged with only the toothed portion 210a of the first day wheel (lower day wheel) 210 to feed to 18 days.

These operations will be described in detail later with reference to fig. 20 to 24. In this example, the first toothless portion 210c or the third toothless portion 220c is included to constitute a null pendulum generating portion.

Further, as will be described later in detail, similarly to the relation with the correction wheel 250, the toothed portion 210a of the first day wheel (lower day wheel) 210 includes the second toothless portion 210d, and when the blank information portion (calendar-free portion) SP1 is positioned below the display window (window of the dial) 300 of the dial, the third drive pawl 255 of the correction wheel 250 described later is laid out with the toothed portion 210a (shown in fig. 26). With this second non-toothed portion 210d, for example, when the correction day wheel is displayed from 13 days to 14 days by the correction wheel 250, the first day wheel (lower day wheel) 210 is not fed, but the fourth driving claw 257 feeds only the toothed portion 220a of the second day wheel (upper day wheel) 220 to 14 days.

As will be described later in detail, similarly to the relation with the correction wheel 250, the toothed portion 220a of the second day wheel (upper day wheel) 220 includes the fourth non-toothed portion 220d, and when the opening 222 is positioned below the display window 300 of the dial, a fourth driving pawl 257 of the correction wheel 250 described later is swung with the toothed portion 220a (shown in fig. 27).

With this fourth toothless portion 220d, for example, when the correction day wheel 250 corrects the day wheel display from 18 days to 19 days, the second day wheel (upper day wheel) 220 is not fed, but the third drive pawl 255 feeds only the toothed portion 210a of the first day wheel (lower day wheel) 210 to 19 days.

In the second embodiment, the first and second toothless portions 210c and 210d of the first day wheel 210 and the third and fourth toothless portions 220c and 220d of the second day wheel 220 are not configured to be cut off, but only the teeth are thinned in the thickness direction, and the teeth are present on the entire day wheel.

(b) Structure of date dial mechanism 226M

The date dial mechanism 226M has two date dials 226, 226 having the same shape for dialing the two day wheels 210, 220, and the date dials 226, 226 are arranged to overlap each other. The first date indicator 210 includes, between the tooth portions 210a and the second date indicator 220 includes, between the tooth portions 220 a: date levers 226 and 226, which are contacted by the mountain-shaped lever parts 226a and 226a, and the spring parts 226c and 226c are extended to the opposite side with the rotation shaft 226b as the center; and a pressing portion 228 that abuts and is fixed to the substrate (here, the bottom plate) 203 at the end portions of the spring portions 226c, 226 c. This toggles the first day wheel 210 and the second day wheel 220. Since the two date levers 226 and 226 having the same shape are arranged to overlap each other, the date lever 226 and the date dial mechanism 226M can be miniaturized on a flat surface. In the present embodiment, the first and second toothless portions 210c and 210d of the first day wheel 210 and the third and fourth toothless portions 220c and 220d of the second day wheel 220 are not configured to have a tooth portion cut off, but only the tooth portions are thinned in the thickness direction, and the date levers 226 and 226 may be engaged between the first and second day wheels 210 and 220 at one tooth portion, and a lever having a general shape other than a special shape may be used.

(c) The structure of the day wheel drive control unit (in this example, the date turning mechanism) 230M

The date indicator driving control part (in this example, the date turning mechanism) 230M includes a date turning wheel 230, a driving pawl (here, the date turning pawl) 233 mounted and fixed on the date turning wheel 230 and rotationally driving the first date indicator 210 and the second date indicator 220, a tooth part 210a of the first date indicator 210 and a tooth part 220 of the second date indicator 220 in contact therewith, and a groove (in this example, an arc-shaped groove) 212 of the first date indicator 210 and a projection 224 of the second date indicator 220. The drive pawl 233 has a notch 233f formed in the rotational direction, and the drive pawl 233 has an elastic structure in which the tip of the drive pawl 233 bends and retreats when the drive pawl 233 is pressed against the teeth 210a and 220a of the sun gear from the direction opposite to the traveling direction a2 (from the back) by the correcting operation of the date correcting mechanism 250M. The first toothless portion 210c is provided on the tooth portion 210a of the first day wheel 210, and the third toothless portion 220c is provided on the tooth portion 220a of the second day wheel 220, which also constitutes a part of a day wheel drive control portion (in this example, a date turning mechanism) 230M.

The teeth 210a and 220a of the first date indicator 210 and the second date indicator 220 are configured to rotate in substantially the same path (here, they are completely overlapped in a plan view), and the drive pawl 233 fixed to the date indicator 230 rotates together with the date indicator 230 to feed the teeth 210a and 220 a. In this way, the second day wheel 220 is overlapped on the first day wheel 210, and the respective day wheels are driven every predetermined period, whereby one day wheel surface is exposed from the display window 300 of the dial plate, and the calendar is displayed.

For this purpose, the sun wheel drive control unit 230M includes: an engagement state generating mechanism which generates a first engagement state in which the drive pawl 233 is engaged with the tooth portion 210a of the first date indicator 210 but the drive pawl 233 is not engaged with the tooth portion 220a of the second date indicator 220 when the display portion 210b of the first date indicator 210 displays information of a section of the window (display window of the dial) 300 through the opening 222 of the second date indicator 220, and which generates a second engagement state in which the drive pawl 233 is engaged with the tooth portion 220a of the second date indicator 220 but the drive pawl 233 is not engaged with the tooth portion 210a of the first date indicator 210 when the display portion 220b of the second date indicator 220 displays information of another section through the window 300; the meshing state switching mechanism switches the meshing state of the drive pawl 233 with the tooth portions 210a and 220a of the first day wheel 210 and the second day wheel 220, and switches the first meshing state and the second meshing state with each other.

The meshing state generating mechanism includes a backlash generating section, in this example, a first toothless section 210c and a third toothless section 220c, and the drive pawl 233 causes one of the sun gears 210 or 220 to freewheel so as to stop one of the first sun gear 210 or the second sun gear 220 and drive only the other sun gear, depending on whether the toothless sections 210c and 220c provided on the toothed section 210a of the first sun gear 210 or the toothed section 220a of the second sun gear 220 are located within the drive locus of the drive pawl 233.

The meshing state switching mechanism has a simultaneous driving mechanism for simultaneously driving the first day wheel 210 and the second day wheel 220 and moving the positions of the toothless portions 210c and 220c located in the driving locus of the driving pawl 233. The simultaneous drive mechanism engages the arcuate groove 212 of the first day wheel 210 with the projection 224 of the second day wheel 220, and simultaneously feeds the day wheels 210, 220 by the push-pull relationship between the groove walls 214a, 214b of the arcuate groove 212 and the projection 224. In this example, the arc-shaped groove 212 is provided in the first day wheel 210 and the projection 224 is provided in the second day wheel 220, but the relationship may be reversed such that the arc-shaped groove 212 is provided in the second day wheel 220 and the projection 224 is provided in the first day wheel 210.

(3) Next, basic operations of the first day wheel 210, the second day wheel 220, and the day wheel drive control unit (in this example, the date turning mechanism) 230M will be described with reference to fig. 16 to 19.

As shown in fig. 17 and 18, in the normal driving state of the second day wheel (upper day wheel) 220, the date turning wheel 230 receives the driving force from the hour wheel 205 rotating in the arrow C2 direction and rotates in the arrow B2 direction. The rotation pawl (date turning pawl) 233 mounted on the date turning wheel 230 also rotates in the arrow B2 direction. In the normal driving state of the second day wheel (upper day wheel) 220, since the driving pawl 233 causes the first non-toothed portion 210c of the toothed portion 210a of the first day wheel 210 to swing freely, only the toothed portion 220a of the second day wheel (upper day wheel) 220 is sequentially fed from 1 to 15 by the driving pawl 233. The case where the date is switched from 15 to 16 and 16 to 17 will be described later.

As shown in fig. 19, in the normal state of the first day wheel (lower day wheel) 210, the date-turning wheel 230 also receives the driving force from the hour wheel 205 rotating in the arrow C2 direction, and rotates in the arrow B2 direction. The rotation pawl (date turning pawl) 233 mounted on the date turning wheel 230 also rotates in the arrow B2 direction. In the normal driving state of the first day wheel (lower day wheel) 210, since the driving pawl 233 causes the third toothless portion 220c of the toothed portion 220a of the second day wheel 220 to swing idly, only the toothed portion 210a of the first day wheel (lower day wheel) 210 is sequentially fed from 17 to 31 by the driving pawl 233. The case when the date is switched from 31 to 1 will be described later.

(4) Next, the detailed operation of the first day wheel 210, the second day wheel 220, and the day wheel drive control unit (in this example, the date turning mechanism) 230M will be described with reference to fig. 20 to 24.

In fig. 20 to 24, only the display window 300 is shown with the dial removed. The top view is explained for the state where the day wheel is normally driven, and fig. 20 shows the state of display for day 1. Fig. 21 shows a state of display for day 15, fig. 22 shows a state of display for day 16, and fig. 23 shows a state of display for day 17. Fig. 24 shows a display state for 31 days. In the second embodiment of fig. 16, the day display window 300 of the dial is located at the position DP2 when it is located at the upper 12 of the drawing. In the drawings, the state of the simultaneous drive mechanism is also schematically shown, and the positions of the arc-shaped groove 212 provided in the first day wheel (lower day wheel) 210 and the groove walls 214a and 214b of the broken portion of the groove are shown. Further, a projection 224 provided on the second day wheel (upper day wheel) 220 to engage with the arc-shaped groove 212 also indicates an engagement position in each drawing.

The positions of the tooth portions 210a and 220a of the day wheels 210 and 220 engaged with the driving pawl (date turning pawl in this example) 233 are indicated by F2 lines. The positions of the teeth 210a and 220a of the day wheels 210 and 220 engaged with the correction claws 253 of the correction wheel 250 are indicated by E2 lines. In addition, positions of the first non-toothed portion 210c (in fig. 20 to 24, a blank triangle Δ is added to the position of the first non-toothed portion) and the second non-toothed portion 210d (in the figure, a circle ● blackened to the position of the second non-toothed portion) provided in the toothed portion 210a of the first day wheel 210 in each figure are shown. Further, the positions of the third toothless portion 220c (in the figure, a black triangle a is added to the position of the third toothless portion) and the fourth toothless portion 220d (in the figure, a blank circle o is added to the position of the fourth toothless portion) provided in the toothed portion 220a of the second day wheel 220 in each figure are shown.

Here, the first and third toothless portions 210c and 220c are toothless portions for date feeding, and the second and fourth toothless portions 210d and 220d are toothless portions for correction. As shown in fig. 18, the first non-toothed portion 210c is formed by cutting off a portion of the tooth portion 210a of the first date indicator 210 on the upper surface side in the thickness direction to leave a thin tooth portion. As shown in fig. 19, the third non-toothed portion 220c is formed by cutting off a portion of the lower surface side in the thickness direction of the toothed portion 220a of the second day wheel 220 to leave a thin toothed portion. As shown in fig. 26, the second non-toothed portion 210d is formed by cutting off a portion of the lower surface side in the thickness direction of the toothed portion 210a of the first date indicator 210 to leave a thin toothed portion. As shown in fig. 27, the fourth non-toothed portion 220d is formed by cutting off a portion of the tooth portion 220a of the second day wheel 220 on the upper surface side in the thickness direction to leave a thin tooth portion.

The first toothless portion 210c is related to the stop of the first day wheel 210 during normal date rotation, and the second toothless portion 210d is related to the stop of the first day wheel 210 during date correction.

The third toothless portion 220c is related to the stop of the second day wheel 220 at the time of normal date rotation, and the fourth toothless portion 220d is related to the stop of the second day wheel 220 at the time of date correction.

Arrow a2 indicates the direction of rotation of the day wheels 210, 220. In each of fig. 20 to 24, the date display marked on the display portion 220b of the second day wheel 220 is described as it is, the date display marked on the display portion 210b of the first day wheel 210 is described as it is, the date display viewed from the opening 222 is described as it is, and other date displays are indicated by smaller numbers in the periphery.

In fig. 20 showing the display state of 1 day of the month, the characters for 1 day of the second day wheel 220 are displayed on the display window 300. At this time, the no information portion (blank portion) SP1 of the first day wheel 210 is positioned below the 1-day characters of the second day wheel on the display window 300. At this time, the first toothless portion 210c of the first date indicator 210 is at the position of line F2 corresponding to the date turning pawl (driving pawl) 233. Therefore, in the display feed for the next day of 2 days, the first day wheel 210 is not fed by the driving pawl 233, but the driving pawl 233 causes the first non-toothed portion 210c to swing freely, and only the toothed portion 220a of the second day wheel 220 is driven by the driving pawl 233, so that the display for the next day appears on the display window 300. This operation, that is, the operation in which the first day wheel 210 is stopped and only the second day wheel 220 is driven 1 day at a time, is continued until 15 days shown in fig. 21 are reached.

In fig. 21 showing the display state of 15 days of the month, 15 days are displayed on the display window 300, and the no information portion (blank portion) SP1 of the first day wheel 210 is located below the same from the time of fig. 20 without moving. On the other hand, the projection 224 follows immediately behind the groove wall 214b of the arc-shaped groove 212.

The display of day 16 on the next day is described on the second day wheel 220, and at this time, the tooth portion 220a of the second day wheel 220 is driven by the drive pawl 233 because the tooth portion 220 of the second day wheel 220 facing the drive pawl 233 has a normal shape, not the third non-tooth portion 220c, and the display of day 16 appears on the display window 300. Simultaneously with the rotation of the second day ring 220, the projection 224 of the second day ring 220 presses the groove wall 214b of the arc-shaped groove 212 of the first day ring 210, and the first day ring 210 is also interlocked with the second day ring 220, and the state shown in fig. 22 is achieved. That is, the no information portion (blank portion) SP2 of the first day wheel 210 comes below the display of the second day wheel 220 for 16 days.

In fig. 22, the first toothless portion 210c of the first day wheel 210 advances 1 tooth further to the F2 line position, and the third toothless portion 220c comes 1 tooth before the F2 line position. The opening 222 of the first date indicator 210 also reaches 1 tooth before the display window 300.

In the feed to the next day of 17 days, the normal tooth portion 210a of the first day wheel 210 and the normal tooth portion 220a of the second day wheel 220 are driven by the drive pawl 233, and the projection 224 of the second day wheel 220 presses the groove wall 214b of the arc-shaped groove 212 of the first day wheel 210 to operate in conjunction with the first day wheel 210, as in the case of the feed from 15 days to 16 days. Thus, the display state for day 17 shown in fig. 23 is achieved.

In the second embodiment, the number of simultaneous driving of the first day wheel 210 and the second day wheel 220 is 3 times obtained by adding 1 to the number 2 of non-information portions.

In fig. 23 showing a display state of 17 days of the month, the opening 222 of the second day wheel 220 comes below the display window 100, and the 17 days of the first day wheel 210 are visible from the display window 300 through the opening 222. Since the first non-toothed portion 210c of the first day wheel 210 is already shifted by 2 days from the position of line F2 facing the drive pawl (date turning pawl) 233, the normal toothed portion 210a of the first day wheel 210 is in a state of being able to mesh with the drive pawl 233, and the toothed portion 210a of the first day wheel 210 is in a state of being able to be driven by the drive pawl 233. On the other hand, the third toothless portion 220c of the second day wheel 220 comes to the position of line F2 opposite to the drive pawl 233.

Therefore, the feed to the next 18 days is only the drive of the tooth portion 210a of the first day wheel 210 by the drive pawl 233, the second day wheel 220 is not fed, and the opening 222 is stopped at the position shown in fig. 23. At this time, since the second day wheel 220 is stopped, the projection 224 does not move, the first day wheel 210 advances forward, and the groove wall 214b of the annular groove 212 moves forward away from the projection 224.

This operation from day 17 to day 18, i.e., the operation in which the second day wheel 220 is stopped and only the first day wheel 210 is driven for 1 day, is continued until day 31 shown in fig. 24 is reached.

Fig. 24 shows a display state for 31 days. The opening 222 of the second day wheel 220 is located directly below the display window 300, and the 31 days of the first day wheel 210 can be seen from the display window 300 through the opening 222.

In this state, the first toothless portion 210c of the toothed portion 210a of the first day wheel 210 is 1 tooth before the F2 line position, and the drive pawl is in the third toothless portion 220c position. Thus, it should be the amount by which the second day wheel 220 is stopped and the first day wheel 210 is driven only for 1 day by the drive pawl 233. However, at the same time, the groove wall 214a of the arc-shaped groove 212 of the first day ring 210 presses the projection 224 of the second day ring 220, and the first day ring 210 and the second day ring 220 rotate, and the display state of day 31 in fig. 24 changes to the display state of day 1 in fig. 20. This makes a monthly cycle display. In the case of a small month, the amount of less than 31 days is corrected by a hand-setting or day correction mechanism.

The above description based on fig. 20 to 24 will be more easily understood by referring to the operation principle explanatory diagrams of the calendar display of the second embodiment of fig. 28, which are displayed in a list.

Fig. 28 schematically shows a cycle from the azimuth PA of the day display to PB, PC, PD, PE, PF, and PA. In each orientation, the day display of the first day wheel is shown on the inside of the ring and the day display of the second day wheel is shown between the large and small rings. The display of the window from the text pad at the orientation is displayed within the frame of the window 300.

The relationship between the groove walls 214a and 214b of the arc-shaped groove 212 and the projection 224 is described between large and small rings in each orientation. In each orientation, a cross-sectional view drawn at the bottom is shown with attention paid to the meshing relationship between the drive pawl (date turning pawl) 233 and the toothed portions 210a and 220a of the first date indicator 210 and the second date indicator 220, and particularly with attention paid to the first toothless portion 210c and the third toothless portion 220 c.

In order to correct this, when reverse hand setting is performed, the drive pawl (date turning pawl) 233 has a bevel portion of the back of the pawl opposite to the feed direction and a notch 233f (shown in fig. 16 and 17) where the tip of the pawl can be bent, and the bevel and the bending allow the drive pawl (date turning pawl) 233 to escape, and neither the first day wheel 210 nor the second day wheel 220 rotates in the reverse direction.

(5) Structure of date correction mechanism 250M

Next, the structure of the date correction mechanism 250M according to the present embodiment will be described with reference to fig. 16 and 25 to 27. Fig. 25 is a top view of the calendar device of the timepiece of fig. 16, showing a corrected state of the second day wheel (upper day wheel) 220. FIG. 26 shows a cross-sectional view taken along line Y17-Y17 of FIG. 25.

The day correction mechanism 250M includes a correction wheel 250, a date correction transmission wheel III263 for transmitting a correction rotational force from the crown 206 via the stem 206a, a date correction transmission wheel II261, and a date correction transmission wheel I259. The date correcting pawl 253 is held by the correcting wheel 250, and the date correcting pawl 253 is configured to integrally include a third driving pawl 255 that drives the tooth portion 210a of the first day wheel 210 in a correcting manner and a fourth driving pawl 257 that drives the tooth portion 220a of the second day wheel 220 in a correcting manner, and is rotationally driven around a shaft 250a fixed to the base plate (bottom plate in this example) 203.

The third drive pawl 255 is shaped in plan with the fourth drive pawl 257. The correction wheel 250 is fitted to the shaft 250a, and the pressure plate 204 is pressed upward and stably held. In this example, the shaft 250a for the correction wheel 250 is not held in a manner to slide in the long hole, but the engagement between the date correction transmission wheel III263 and the date correction transmission wheel II261 is disengaged except when the correction rotation is transmitted via the stem 206a, and the correction wheel 250 performs the operation of canceling the rotation of the day wheel from the date turning mechanism 230M by the freely rotating mechanism.

A second toothless portion 210d for avoiding meshing with the third drive pawl 255 is provided in the toothed portion 210a of the first day wheel 210 positioned in the drive path of the third drive pawl 255 in correspondence with a predetermined period during which the fourth drive pawl 257 corrects and drives the toothed portion 220a of the second day wheel 220. At the second toothless portion 210d, the third drive pawl 255 swings freely. Further, a fourth toothless portion 220d for avoiding meshing with the fourth driving pawl 257 is provided on the toothed portion 220a of the second day wheel 220 positioned on the driving path of the fourth driving pawl 257, in correspondence with a predetermined period during which the third driving pawl 255 corrects and drives the toothed portion 210a of the first day wheel 210. At the fourth toothless portion 220d, the fourth driving pawl 257 swings freely.

As described above, the second toothless portion 210d has a toothed portion on the upper surface side by cutting off the lower surface side of the toothed portion 210a of the first day wheel 210 as shown in fig. 26, and the fourth toothless portion 220d has a toothed portion on the lower surface side by cutting off the upper surface side of the toothed portion 220a of the second day wheel 220 as shown in fig. 27.

(6) Next, the operation of the date correction mechanism 250M will be described.

The correction wheel 250, the date correction transmission wheel I259, and the date correction transmission wheel II261 rotate in the directions of arrows G2, H2, and I2 shown in fig. 16 and 25 via the crown 206, the stem 206a, and the date correction transmission wheel III 263. In fig. 25 and 26, the second toothless portion 210d of the first day wheel 210 is positioned opposite the third drive pawl 255.

Therefore, in the display from day 1 to day 15, the fourth driving claw 257 sequentially feeds only the second day wheel 220 in the direction of the arrow a2 of fig. 25. This state is shown in fig. 20 and 21. When the display is changed to 15 days, the projection 224 on the back surface of the second day wheel 220 presses the groove wall 214b of the arc-shaped groove 212 of the first day wheel 210, and both the day wheels 210 and 220 are fed in an interlocking manner. As a result, as shown in fig. 22 and 23, date feeding can be performed from 15 days to 16 days and 17 days. In fig. 23, since the second toothless portion 210d moves to this point, the fourth toothless portion 220d of the second day wheel 220 faces the fourth driving pawl 257 instead of the normal toothless portion 210a of the first day wheel 210, the third driving pawl 255 sequentially feeds the toothless portion 210a of the first day wheel (next day wheel) 210 from 17 days to 31 days. As shown in fig. 24, the fourth non-toothed portion 220d is positioned to face the fourth driving pawl 257 as it is at 31 days, but since the normal toothed portion 210a of the first date indicator 210 faces the third driving pawl 255, the first date indicator 210 is fed only for the next 1 day, and the projection 224 on the back surface of the second date indicator 220 is pressed by the groove wall 214a of the arc-shaped groove 212 of the first date indicator 210, so that both the date indicators 210 and 220 are fed in an interlocking manner. In this way, the state shown on day 1 of fig. 20 is returned. Thus, the correction also loops.

In the first and second embodiments described above, the date correction mechanism structure in which the date wheel drive control units (date turning mechanisms) 30M and 230M do not interfere with the date correction mechanisms 50M and 250M can be obtained, and the date wheel drive control units are not limited to specific portions as long as the positional relationship between the date wheel drive control units and the date correction mechanisms matches the positional relationship between the tooth portions.

In the above description, the first to fourth toothless portions 10c, 10d, 20c, 20d, 210c, 210d, 220c, and 220d have been described as thin teeth portions that remove a part of the teeth portions 10a, 20a, 210a, and 220a in the thickness direction, but may be formed of toothless portions that remove the entire regions of the teeth portions.

Although the first embodiment has been described with the tooth portions 10a and 20a being 16 teeth and the second embodiment with the tooth portions 210a and 220a being 17 teeth, a tooth portion having 17 or more teeth may be formed on the day wheel. For example, in the case of 18 teeth, the first day wheel (lower day wheel) is provided with 4 no-information parts from 18 days to 31 days, the second day wheel (upper day wheel) is provided with 1 day to 17 days and an opening part, and the number of simultaneous driving of the day wheels is 5.

In the above description, the tooth numbers of the teeth 10a, 20a, 210a, and 220a are 16 teeth, 17 teeth, and 18 teeth, but the present invention can be applied to the tooth number of the display wheel as long as it is 3 teeth or more.

Although the display device has been described above using a calendar device of a timepiece as an example, the present invention can be applied to a display device that displays information by a rotating display wheel, for example, display mode switching information, a day of the week, a lunar calendar, the morning and the afternoon, and a city name of a world clock.

Industrial applicability

As described above, the display device and the calendar device of the timepiece according to the present invention are useful as a device for making the display of characters and numerals of the display device large, and are particularly applicable to display devices which tend to be small in display, such as display devices, watches, and small-sized clocks.

Claims (26)

1. A display device, comprising:

a first display wheel having a display portion for displaying a partial period of information and a plurality of teeth portions for being driven;

a second display wheel having a display portion for displaying a period other than the period displayed by the first display wheel, an opening portion for exposing the first display wheel, and a plurality of teeth portions for being driven, the second display wheel being disposed to overlap the first display wheel; and

a driving pawl for rotationally driving the first display wheel and the second display wheel;

a display device including a display wheel drive control unit that displays information by driving the first display wheel and the second display wheel by the driving pawl every predetermined period and exposing the display portion of one display wheel from a window;

it is characterized in that the preparation method is characterized in that,

the tooth part of the first display wheel and the tooth part of the second display wheel have the same number of teeth;

the display wheel drive control unit includes:

an engagement state generating mechanism that generates a first engagement state in which the drive pawl is engaged with the tooth portion of the first display wheel and the drive pawl is not engaged with the tooth portion of the second display wheel when the display portion of the first display wheel displays the information of the partial period through the opening portion of the second display wheel and the window, and generates a second engagement state in which the drive pawl is engaged with the tooth portion of the second display wheel and the drive pawl is not engaged with the tooth portion of the first display wheel when the display portion of the second display wheel displays the information of the other period through the window; and

an engagement state switching mechanism configured to switch an engagement state of the drive pawl with respect to the tooth portions of the first indicator wheel and the second indicator wheel, and to switch the first engagement state and the second engagement state with each other;

the meshing state generating mechanism includes an idle rotation generating portion that idly swings one display wheel by the driving pawl to stop one of the first display wheel and the second display wheel and drives only the other display wheel, depending on whether or not a non-toothed portion provided on the toothed portion of at least one of the first display wheel and the second display wheel is located within a driving locus of the driving pawl;

the non-toothed portion is a thin toothed portion in which a part of the thickness direction of the toothed portion is cut off.

2. The display device of claim 1,

the meshing state switching mechanism includes a simultaneous driving mechanism that simultaneously drives the first display wheel and the second display wheel to move the position of the thin tooth portion within the driving locus of the driving pawl.

3. The display device of claim 1,

the number of teeth of the tooth portion of the first display wheel is 17 teeth, and the display portion of the first display wheel has 17 days to 31 days in the day period and two non-information portions continuously provided between 17 days and 31 days;

the number of teeth of the tooth portion of the second display wheel is 17 teeth, and the display portion of the second display wheel has 1 day to 16 days of the day period and the opening portion provided between 1 day and 16 days;

in each date feeding from 1 to 15 days, only the second display wheel is driven by the driving pawl;

in the date feeding from 15 to 16 days and from 16 to 17 days, the first display wheel and the second display wheel are driven simultaneously;

in each date feeding from 17 to 31 days, only the first display wheel is driven by the driving pawl;

in the date feeding from 31 to 1 day, the first display wheel and the second display wheel are driven simultaneously.

4. The display device according to claim 3, wherein the number of simultaneous driving times of the simultaneous driving mechanism is a number obtained by adding 1 to the number of the non-information portions.

5. The display device according to claim 2, wherein the simultaneous driving means is a projection provided on each of the display wheels and a groove engaged with the projection.

6. The display device of claim 1,

the driving pawl has a first driving pawl for driving the tooth portion of the first display wheel and a second driving pawl for driving the tooth portion of the second display wheel;

the meshing state generating mechanism is a path switching mechanism that disengages the second drive pawl from a drive path when the first drive pawl drives the tooth portion of the first display wheel, so as to avoid meshing between the tooth portion of the second display wheel and the second drive pawl.

7. The display device of claim 6,

the first drive pawl and the second drive pawl are drive pawls each having at least one contact portion that contacts the tooth portion;

the path switching mechanism is a clock component which appears in the drive region of the first drive pawl during a predetermined period of time when the tooth portion of the first display wheel is driven, and which contacts the contact portion of the first drive pawl to switch the drive path of the second drive pawl to the avoidance path.

8. The display apparatus of claim 6, wherein said first drive pawl is integrally formed with said second drive pawl.

9. The display device according to claim 7, wherein the timepiece structural member is a tooth portion of the first display wheel.

10. The display device of claim 6,

the tooth portion of the first display wheel and the tooth portion of the second display wheel are configured to rotate in substantially the same path; and is

The first drive pawl and the second drive pawl are configured to integrally rotate with respect to a predetermined rotation center;

the engaging portion of the first driving pawl is disposed closer to the tooth portions of the first indicator wheel and the second indicator wheel than the engaging portion of the second driving pawl.

11. The display device of claim 6,

the tooth portion of the first display wheel and the tooth portion of the second display wheel are configured to rotate in substantially the same path; and is

The first drive pawl and the second drive pawl are configured to integrally rotate with respect to a predetermined rotation center;

the length from the predetermined rotation center to the engagement portion of the first drive pawl is formed longer than the length from the predetermined rotation center to the engagement portion of the second drive pawl.

12. The display device according to claim 7, wherein a non-toothed portion for allowing the toothed portion of the first display wheel to swing freely and avoiding engagement with the first drive pawl is provided in the toothed portion of the first display wheel located in the drive path of the first drive pawl in accordance with a predetermined period during which the second drive pawl drives the toothed portion of the second display wheel.

13. The display device according to claim 12, wherein the second drive pawl is located in a drive path engaging with the toothed portion of the second display wheel by an abutment portion of the first drive pawl entering the non-toothed portion.

14. The display device according to claim 7, wherein the first driving pawl and the second driving pawl have elongated holes whose rotational centers are changeable with respect to a predetermined axis, and are urged toward the tooth portions of the first display wheel and the second display wheel by spring members.

15. The display device according to claim 1, wherein a correction wheel having a driving pawl for correcting and driving the teeth of the first display wheel and the second display wheel is provided.

16. The display device of claim 15,

a drive pawl of the correction wheel having a third drive pawl for correcting and driving the tooth portion of the first display wheel and a fourth drive pawl for correcting and driving the tooth portion of the second display wheel, and being configured to be integrally rotationally driven with respect to a predetermined rotational center;

the engaging portion of the third driving pawl is disposed closer to the tooth portions of the first indicator wheel and the second indicator wheel than the engaging portion of the fourth driving pawl.

17. The display device of claim 15,

a drive pawl of the correction wheel having a third drive pawl for correcting and driving the tooth portion of the first display wheel and a fourth drive pawl for correcting and driving the tooth portion of the second display wheel, and being configured to be integrally rotationally driven with respect to a predetermined rotational center;

the length from the predetermined rotation center to the engagement portion of the third drive pawl is formed longer than the length from the predetermined rotation center to the engagement portion of the fourth drive pawl.

18. The display device according to claim 16 or 17,

and a toothless portion for avoiding engagement with the third driving pawl is provided on the toothed portion of the first display wheel positioned in the driving path of the third driving pawl corresponding to the predetermined period during which the fourth driving pawl drives the toothed portion of the second display wheel in a correcting manner.

19. The display device according to claim 16 or 17, wherein at least one of the third driving pawl and the fourth driving pawl is provided with an abutting portion which abuts against the tooth portions of the first display wheel and the second display wheel.

20. The display device according to claim 18, wherein the fourth driving pawl is guided to the driving path engaging with the tooth portion of the second display wheel by the abutting portion of the third driving pawl entering the toothless portion.

21. The display device according to claim 16 or 17, wherein the third driving pawl and the fourth driving pawl have a commutator mechanism whose rotational center position is variable with respect to a predetermined axis.

22. The indicating device of claim 16 or 17 wherein said first indicator wheel has a first toothless portion for avoiding engagement with said first drive pawl and a second toothless portion for avoiding engagement with said third drive pawl.

23. The display device according to claim 22, wherein the first toothless portion is provided on an upper surface side of the tooth portion of the first display wheel, and the second toothless portion is provided on a lower surface side of the tooth portion of the first display wheel.

24. The display device of claim 23,

the number of teeth of the tooth portion of the first display wheel is 16, and the display portion of the first display wheel has days 16 to 31;

the number of teeth of the tooth portion of the second display wheel is 16, and the display portion of the second display wheel has 1 to 15 days of the day and the opening portion provided between 1 and 15 days;

in each date feeding from 1 to 15 days, the first driving pawl causes the first non-toothed portion of the first display wheel to swing idly, and only the second display wheel is driven by the second driving pawl;

simultaneously driving the first display wheel and the second display wheel by a simultaneous driving mechanism in date feeding from 15 days to 16 days;

in each date feeding from 17 to 31 days, the second drive pawl is separated from the tooth portion of the second display wheel by the abutment portion abutting against the tooth portion of the first display wheel, and only the first display wheel is driven by the first drive pawl;

in the date feeding from 31 to 1 day, the contact portion and the first driving pawl enter the first non-toothed portion, and only the second display wheel is driven by the second driving pawl.

25. The display device of claim 23,

the number of teeth of the tooth portion of the first display wheel is 16, and the display portion of the first display wheel has days 16 to 31;

the number of teeth of the tooth portion of the second display wheel is 16, and the display portion of the second display wheel has 1 to 15 days of the day and the opening portion provided between 1 and 15 days;

in each correction from 1 to 15 days, the third driving pawl causes the second toothless portion to swing idly, and only the second indicator wheel is driven by the fourth driving pawl;

simultaneously driving the first display wheel and the second display wheel by a simultaneous driving mechanism during the correction from 15 days to 16 days;

in each correction from day 17 to day 31, the fourth drive pawl is separated from the tooth portion of the second display wheel by the abutment portion abutting against the tooth portion of the first display wheel, and only the first display wheel is driven by the third drive pawl;

in the correction from day 31 to day 1, the contact portion and the third driving pawl enter the second toothless portion, and only the second display wheel is driven by the fourth driving pawl.

26. A calendar device of a timepiece, wherein the display device according to any one of claims 1 to 25 is a calendar device of a timepiece.