JP2011220753A - Electronic timepiece - Google Patents

Abstract

There is provided an electronic timepiece having a driven body that is temporarily subjected to a high load and capable of reliably driving the driven body even under a high load while suppressing an increase in energy consumption.
An electronic timepiece includes a CG motor 31, a secondary battery 73, a CG display control means 91 for controlling the CG motor 31, a CG motor driving means 92, and a high load torque detecting means 93. The high load torque detecting means 93 detects a low load torque period in which only the second CG wheel is driven and a high load torque period in which the minute CG wheel is also driven. The CG motor drive unit 92 outputs a first drive pulse during the low load torque period, and outputs a second drive pulse having a larger energy than the first drive pulse when the high load torque period is detected.
[Selection] Figure 10

Description

  The present invention relates to an electronic timepiece.

  In an analog electronic timepiece that drives a pointer with a step motor, the driving torque of the step motor is very small. Therefore, when a mechanism having a driven part (load) such as a pointer is driven by the step motor, the necessary driving torque can be obtained. It is common to drive with a reduction ratio set to.

By the way, a timepiece having a mechanism in which the load of the driven part temporarily becomes a high load is known. For example, there is a chronograph timepiece equipped with a mechanism for feeding a minute CG wheel (minute chronograph wheel) regulated by a jumper with a minute CG feed claw provided on the second CG wheel (see Patent Document 1).
In this chronograph timepiece, when the chronograph is operated, the minute CG wheel is intermittently driven every minute, and at the timing when the minute CG wheel is driven, the second CG wheel and the minute CG wheel are simultaneously driven. Therefore, the load is temporarily high.

In addition, in a watch having a calendar mechanism that performs date display with the 1st place date plate and the 10th place date plate, the 1st place date plate is rotated by a date wheel and the 10th place drive tooth formed on the 1st place date plate. The tenth date wheel is driven to rotate the tenth date plate (see Patent Document 2).
In this timepiece, when the date display is switched from the 9th to the 10th and when the date display is switched from the 19th to the 20th, for example, when the 1st place date plate and the 10th place date plate are simultaneously rotated, the load is temporarily high.

JP 2007-240237 A JP 2009-250912 A

In Patent Document 1, the second CG wheel and the minute CG wheel are driven by the mainspring drive. However, when these are driven by the step motor having a small drive torque, there are the following problems.
That is, the reduction ratio from the step motor to the second CG wheel is uniquely determined according to the operation cycle of the step motor, and the reduction ratio from the second CG wheel to the minute CG wheel is also uniquely determined. The step motor for driving the second CG wheel is normally operated every second to step the second CG wheel. As described above, when the step motor is operated at a cycle of 1 second, it is impossible to obtain the torque necessary for driving the CG vehicle by the jumper by setting the reduction ratio.
In addition, if the stepping motor cycle of the step motor is shortened to less than 1 second and the reduction ratio is increased to increase the torque, the current consumption increases according to the operating cycle, and the torque is not required (with a feed claw). There was a problem that wasteful energy was consumed and the battery life was reduced while the minute CG vehicle was not being sent.

  Further, Patent Document 2 cannot provide an independent motor for the calendar mechanism, and if the calendar mechanism must be driven by power from a basic clock motor, or provides an independent motor for the calendar mechanism. However, when the space for placing the reduction gear train cannot be secured, especially when both the 10th date plate and the 1st date plate are rotated simultaneously, the necessary torque cannot be obtained and the drive cannot be performed. was there.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic timepiece having a driven body that is temporarily subjected to a high load and capable of reliably driving the driven body even at a high load while suppressing an increase in energy consumption. .

  An electronic timepiece according to the present invention includes a step motor, a power source that supplies power to the step motor, a control unit that controls driving of the step motor, and a driven unit that is driven by the step motor. The driven portion generates a low load torque period that can be driven by the first torque and a high load torque period that can be driven only by the second torque that is higher than the first torque. The control unit includes torque period detection means for detecting each torque period, and drive pulse output means for outputting a drive pulse to the step motor. The drive pulse output means is a low load torque by the torque period detection means. When the period is detected, a first drive pulse is output, and when the high load torque period is detected by the torque period detection means, the first drive pulse is output. And outputting a second larger drive pulse of energy.

According to the present invention, when the driven part is in the high load torque period, the second drive pulse is output to the step motor, so that the driven part having a high load can be reliably driven. For this reason, the driven part can be driven by the step motor even under a restrictive condition in which the reduction ratio cannot be arbitrarily set.
In addition, when the driven part is in the low load torque period, it is driven by the first drive pulse, so that it is possible to reduce energy consumption compared to the case where the driven part is continuously driven only by the second drive pulse.
Therefore, in an electronic timepiece having a driven body that is temporarily subjected to a high load, the driven body can be reliably driven even at a high load while suppressing an increase in energy consumption.

  In the present invention, a duration display means for displaying a duration based on the remaining energy of the power source is provided, and the duration display means is operated in an operation mode in which the high load torque period is periodically generated. The energy consumed by the first drive pulse during the low load torque period, the energy consumed by the second drive pulse during the high load torque period, the generation interval of the high load torque period, It is preferable to display the duration calculated based on the remaining energy of the power source.

According to the present invention, since the duration display means is provided, the user can check the remaining duration of the electronic timepiece, and the electronic timepiece stops when the duration becomes zero hours without the user's intention. Can be prevented.
In addition, in the operation mode in which the high load torque period is periodically generated, the duration is displayed in consideration of the generation interval of the high load torque period and the energy consumption at that time. The time can be displayed, and the user can accurately grasp how long the operation can be continued in the operation mode.

For example, in an electronic timepiece having a chronograph mechanism, when the chronograph mechanism is in a non-driven state and only the basic timepiece that indicates the current time is being driven, it is calculated from the energy required for moving the hand of only the basic timepiece. Displays the duration that will be played.
On the other hand, when the minute CG wheel is operated with a chronograph mechanism that is intermittently driven every minute, energy consumption required for a high load torque interval every minute and energy consumption required for other low load torque intervals The duration calculated by taking into account is displayed.
In particular, when the chronograph mechanism is operated, the energy consumption is greatly increased as compared with the case where only the basic timepiece is operated. Also in this case, since the duration is recalculated based on the increased energy consumption, the user can easily grasp how long the duration is when the chronograph mechanism is continuously operated. Therefore, it is possible to prevent the user from losing energy unexpectedly and stopping the electronic timepiece.
In addition, when the chronograph mechanism is stopped, the duration is recalculated based on the energy consumed by the operation of the basic clock, so the correct duration when only the basic clock is operating is given to the user. I can inform you.

  Further, in an electronic timepiece with a calendar mechanism having a tenth date plate and a first date plate, a high load torque period is generated every 10 days when the tenth date wheel is rotated. Therefore, the duration is displayed by taking into account the energy consumption required for this high load torque period and the energy consumption required for other low load torque periods. For this reason, when calculating the duration, the correct duration can be calculated in consideration of the energy consumption of the high load torque period that occurs every 10 days, and the accurate duration can be displayed.

  In the present invention, it is preferable that the drive pulse output means sets at least one of the pulse width or voltage of the second drive pulse to be larger than that of the first drive pulse.

  According to the present invention, the first drive pulse and the second drive pulse can be set only by pulse control, and the output torque of the step motor can be easily controlled only by pulse control.

  In the present invention, a rotation determination unit that determines whether or not the rotor of the step motor has rotated, the drive pulse output means detects that the torque period detection means is the low load torque period, When the rotation determination unit determines that the rotor is not rotating when the first drive pulse is output to the motor, the energy is greater than the first drive pulse and the energy is greater than the second drive pulse. It is preferable to output a small correction drive pulse.

According to the present invention, since the correction drive pulse is provided, the first drive pulse can be set to a pulse having a small energy. For example, even during the low load torque period, the motor may not be driven with the first drive pulse due to the position of the watch. In such a case, the step motor can be reliably driven by further outputting a correction drive pulse having energy larger than that of the first drive pulse.
For this reason, the energy consumption of the first drive pulse normally used in the low load torque period can be reduced, and the motor can be driven reliably even if the load fluctuates.

  In the present invention, the driven portion is a chronograph mechanism having a second CG wheel driven by the step motor and a minute CG wheel driven intermittently by a feed claw provided in the second CG wheel, The torque period detection means measures an elapsed time from the start of operation of the chronograph mechanism, and when the elapsed time is a preset feed pawl engagement period, determines that it is a high load torque period, The other period is preferably determined as a low load torque period.

  In the present invention, the period in which only the second CG wheel is driven is driven by the first drive pulse, and the feeding claw of the second CG wheel is engaged with the minute CG wheel and each CG wheel is simultaneously driven (for example, During the period from 56 seconds to 60 seconds per minute from the start of the chronograph), the second drive pulse is used. For this reason, it is possible to achieve both reduction of power consumption and reliable driving at high load torque.

  In the present invention, the driven part is a calendar mechanism including a 1st date indicator driven by the step motor and a 10th date indicator driven by a 10th date driving tooth provided in the 1st date indicator. Preferably, the torque period detection means detects a high load torque period by detecting the start of rotation of the tenth date wheel.

In the present invention, during the period in which only the 1st date indicator is driven, it is driven by the first drive pulse, and the 10th drive tooth of the 1st date indicator is engaged with the 10th date indicator, so that each date indicator is driven simultaneously. Period (for example, when switching from 9 days to 10 days, when switching from 19 days to 20 days, when switching from 29 days to 30 days, when switching from 30 days to 31 days, from 31 days to 1 day) ) Is driven by the second drive pulse, so that both reduction in power consumption and reliable driving at high load torque can be achieved.
The torque period detection means may be any means that can detect the high load torque period by detecting the rotation start of the tenth date wheel. For example, the rotation time of the tenth date wheel (tenth date feeding period) is slightly determined depending on the gear reduction ratio, etc., although there is some variation. Therefore, if the rotation start of the tenth date wheel is detected, the period from the rotation start to the rotation end, that is, the high load torque period can be detected.

  In the present invention, the power source is composed of a rechargeable secondary battery, and a power generation device that supplies power to the secondary battery or a charging device that supplies power from an external power supply source to the secondary battery. It is preferable to provide.

If the power generation device and the charging device are provided, the energy consumed for the secondary battery can be supplemented.
Furthermore, if a duration display means is provided, the user can grasp the remaining energy level of the secondary battery to be increased or decreased, and can be used according to the remaining energy level, and can prompt generation and charging as necessary. it can.

It is a front view which shows the electronic timepiece of 1st Embodiment of this invention. It is a top view which shows the movement of 1st Embodiment. It is sectional drawing which shows the principal part of the movement of 1st Embodiment. It is sectional drawing which shows the principal part of the movement of 1st Embodiment. It is a figure explaining operation | movement of a minute CG vehicle drive mechanism. It is a figure explaining the drive operation of a minute CG wheel. It is a figure explaining the drive operation of a minute CG wheel. It is a figure explaining the zero return operation of a minute CG wheel. It is a figure explaining the zero return operation of a minute CG wheel. It is a block diagram which shows the circuit structure of the electronic timepiece of 1st Embodiment. It is a timing chart which shows the drive pulse of the CG motor of 1st Embodiment. It is a graph which shows the relationship between a drive pulse width and minute hand torque. It is a graph which shows the relationship between a drive pulse width and current consumption. It is a top view which shows the date display mechanism of 2nd Embodiment. It is an enlarged plan view which shows the tenth date drive mechanism of 2nd Embodiment. It is a top view which shows the tenth feed timing detection means of 2nd Embodiment. It is sectional drawing which shows the tenth feed timing detection means of 2nd Embodiment.

[First Embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
The electronic timepiece 1 of the first embodiment is an analog electronic timepiece having a power generation mechanism, a remaining energy (duration, power reserve) display mechanism, and a chronograph mechanism.
As shown in FIG. 1, the electronic timepiece 1 includes a dial 2, a pointer for a basic timepiece for displaying the current time, a CG (chronograph) hand 3 for chronograph, and a power reserve for displaying remaining energy. A needle (PR needle) 4, a crown 5, and buttons 6 and 7 are provided.

  The pointer includes an hour hand 2A, a minute hand 2B, and a second hand 2C. The hour hand 2 </ b> A and the minute hand 2 </ b> B are disposed at the center position of the dial 2, and the second hand 2 </ b> C is disposed at a position shifted from the center of the dial 2 in the 6 o'clock direction.

The CG hand 3 includes a second CG hand 3A and a minute CG hand 3B. The second CG hand 3 </ b> A is disposed coaxially with the hour hand 2 </ b> A and the minute hand 2 </ b> B, and the minute CG hand 3 </ b> B is disposed at a position shifted in the 2 o'clock direction with respect to the center of the dial 2.
The power reserve needle 4 is arranged at a position shifted in the 9 o'clock direction with respect to the center of the dial 2.

FIG. 2 is a plan view showing a configuration of a movement for driving each pointer. 3 and 4 are sectional views of the movement.
FIG. 2 is a view of the movement viewed from the back cover side of the electronic timepiece 1, and the 3, 6, 9, and 12 o'clock directions on the dial 2 are as described in the drawing.
3 is a cross-sectional view showing a basic watch wheel train 22 and a CG train wheel 32, which will be described later, and FIG. 4 is a cross-sectional view showing a train wheel that drives the minute CG hand 3B of the CG train wheel 32.

  The electronic timepiece 1 includes a power generation means 10, a basic timepiece driving means 20, a CG driving means 30, and a power reserve display means 50.

[Power generation means]
The power generation means 10 includes a power generation device 11. This power generator 11 is a general AC generator including a stator 13 in which a rotor 12 is rotatably arranged and a coil block 15 around which a coil 14 is wound.
The power generation device 11 rotates the rotor 12 with mechanical energy transmitted from a rotary weight (not shown) arranged inside the case of the timepiece 1 or mechanical energy transmitted by a rotation operation of the crown 5. It generates electricity. Since the specific configuration of the automatic winding power generation using the rotating weight and the manual winding power generation using the crown 5 is a known technique that has been conventionally known, the description thereof will be omitted.

[Basic clock driving means]
The basic timepiece driving means 20 includes a basic timepiece motor 21 and a basic timepiece wheel train 22. The basic timepiece motor 21 is generally a step motor including a stator in which a rotor 21A is rotatably arranged and a coil block around which a coil is wound.

As shown in FIG. 3, the basic clock train 22 includes the fifth wheel 23, the fourth wheel 24, the third wheel 25, the second wheel 26, the eighth wheel (rear wheel) 27, the hour wheel 28, and the like. It is a train wheel for general basic timepieces equipped with. Accordingly, the minute hand 2B is attached to the second wheel 26 and the hour hand 2A is attached to the hour wheel 28.
Since the second hand 2C is provided at a position different from the hour hand 2A and the minute hand 2B, the second wheel 29 to which the second hand 2C is attached meshes with the fifth wheel 23 as shown in FIG. Accordingly, the rotational energy transmitted from the rotor 21A to the fifth wheel 23 is transmitted to the fourth wheel 24 and the second wheel 29.

[CG drive means]
The CG drive means 30 includes a CG motor 31, a second CG wheel drive mechanism for transmitting the rotation of the CG motor 31 to the second CG wheel 36 and the second CG hand 3A, and the rotation of the second CG wheel 36 to the minute CG wheel 46 and the minute CG. And a CG vehicle drive mechanism for transmitting to the needle 3B.
Similar to the basic timepiece motor 21, the CG motor 31 is a general step motor including a CG rotor 31A.

[Second CG car drive mechanism]
As shown in FIG. 3, the second CG wheel drive mechanism transmits a rotational force from the CG motor 31 to drive the second CG wheel 36, as shown in FIG. 3, the second CG first intermediate wheel 33, the second CG second wheel. An intermediate wheel 34 and a second CG third intermediate wheel 35 are provided. For this reason, when the CG rotor 31A rotates, it is decelerated via the intermediate wheels 33 to 35, and the second CG wheel 36 rotates.

[Second CG car]
As shown in FIG. 4, the second CG wheel 36 includes a second CG true 361, a heart cam 362, a second CG gear 363, a minute CG feed pawl stop seat 41, and a second balancer 368 serving as a rotation axis. The second balancer 368 is a balancer that mainly corrects the weight imbalance due to the heart cam 362 so that the center of gravity position in the plane direction of the second CG wheel 36 becomes the second CG true 361 portion.

The second CG gear 363 is loosely fitted to the second CG true 361 so as to be rotatable, and is pressed against the collar portion of the second CG true 361 by the elastic force of the slip spring 365. The slip spring 365 presses the second CG gear 363 with a certain amount of bending by pressing and fixing the slip spring holding seat 366 to the second CG true 361.
For this reason, the second CG gear 363 and the second CG true 361 are frictional forces due to the pressing of the slip spring 365 and rotate together during the chronograph measurement. In the present embodiment, the rotation of the CG rotor 31A is decelerated at a reduction ratio of 1/300 by the CG wheel train 32, and the second CG wheel 36 and the second CG hand 3A are driven by the 1/10 second hand movement in one minute. Rotate once.

  On the other hand, at the time of return to zero, the heart cam 362 is forced to rotate by pressing the side surface with a hammer of a hammer 630 described later, so the second CG true 361 and the second CG gear 363 slip, and the heart cam 362 and the second CG The true 361 rotates and returns the second CG hand 3A to the 0 second position. At this time, the second CG gear 363 and the CG wheel train 32 from the second CG third intermediate wheel 35 to the CG rotor 31A do not rotate and maintain the normal meshing.

[Minute CG car drive mechanism]
The minute CG wheel drive mechanism transmits the rotation of the second CG wheel 36 and drives the minute CG wheel 46. The detailed configuration of the CG vehicle drive mechanism will be described with reference to FIGS. In FIG. 5, the arrangement position of the minute CG intermediate wheel 45 with respect to the minute CG feed pawl stop seat 41 and the minute CG wheel 46 is different from that shown in FIG. Since the position of the minute CG intermediate wheel 45 can be adjusted as long as the rotation can be transmitted from the second CG wheel 36 to the minute CG wheel 46, the rotation operation is the same as in FIGS. Therefore, the detailed configuration of the minute CG vehicle driving mechanism will be described with reference to FIG.

  The minute CG wheel drive mechanism has a minute CG feed claw stop seat 41 to be inserted into the second CG wheel 36, a minute CG feed claw 42 attached to the minute CG feed claw stop seat 41, and a minute CG feed claw 42. A minute CG feed claw spring 43 as an elastic member urging the position and a minute CG intermediate wheel 45 that engages with the minute CG feed claw 42 and intermittently drives the minute CG wheel 46 are configured. .

[Minute CG feed claw stop]
The minute CG feed claw stop seat 41 is fitted and fixed to the second CG true 361, and a minute CG feed claw guide portion 41A protruding in a peninsular shape is formed on the outer peripheral portion. Furthermore, the minute CG feed claw stop seat 41 is provided with a minute CG feed claw spring guide shaft 411 and a minute CG feed claw guide shaft 412 at positions facing each other with the second CG true 361 interposed therebetween.

[Minute CG feed claw]
The minute CG feed claw 42 is inserted into the upper part (back cover side) of the minute CG feed claw stop seat 41. The minute CG feed claw 42 has a U-groove shape in which a first guide portion 42A whose front end is bent downward and contacts the side surface of the minute CG feed claw guide portion 41A and the minute CG feed claw guide shaft 412 is disposed. A second guide part 42B and a claw part 42C provided between the guide parts 42A and 42B are formed.

[Minute CG feed claw spring]
The minute CG feed claw spring 43 is placed on top of the minute CG feed claw stop seat 41. The minute CG feed claw spring 43 is formed with a hole through which the second CG feed claw 361 is inserted and a hole through which the minute CG feed claw spring guide shaft 411 is inserted, and these holes are passed through the second CG feed 361 and the minute CG feed. It is positioned by being inserted through the claw spring guide shaft 411.
Further, the minute CG feed claw spring 43 has a simple leaf spring-like spring portion 43 </ b> A extending outward from the main body portion. Further, the minute CG feed claw spring 43 has a peninsular protrusion 43B extending from the main body portion toward the minute CG feed claw guide 41A of the minute CG feed claw stop seat 41.

The spring portion 43A is disposed below the projecting portion 43B, and the tip thereof is extended upward, and is in contact with the side surface of the first guide portion 42A.
As a result, the spring portion 43A of the minute CG feed claw spring 43 biases the minute CG feed claw 42 outward. Therefore, in the minute CG feed claw 42, normally, as shown in FIG. 5, the first guide portion 42A and the second guide portion 42B abut on the minute CG feed claw guide portion 41A and the minute CG feed claw guide shaft 412. Placed in position.

  Accordingly, the minute CG feed claw 42 rotates around the CG feed claw guide shaft 412 while the second guide portion 42B is engaged with the minute CG feed claw guide shaft 412, and the first guide portion 42A is separated. It is biased to a position where it abuts on the CG feed claw guide 41A. For this reason, the tip of the claw portion 42C has moved to a position where the minute CG intermediate wheel 45 can be driven. The minute CG intermediate wheel 45 is driven by the claw portion 42C.

At this time, since the second CG wheel 36 rotates once per minute, the CG feed claw stop seat 41 fixed to the second CG true 361 also rotates once per minute.
When the minute CG feed claw stop seat 41 makes one rotation per minute, the minute CG feed claw 42 engages with the minute CG intermediate gear 451 of the minute CG intermediate wheel 45 and rotates the minute CG intermediate wheel 45.

[Minute CG intermediate car]
The minute CG intermediate wheel 45 includes a minute CG intermediate gear 451 and a minute CG intermediate pinion 452. The minute CG intermediate gear 451 has intermittent tooth portions in which seven tooth portions 451A that engage with the claw portions 42C of the minute CG feed claw 42 are provided at equal intervals. The minute CG intermediate kana 452 is also formed with seven teeth. This minute CG intermediate pinion 452 meshes with the minute CG wheel 46.

A minute CG jumper 47 is engaged with the minute CG intermediate wheel 45. The minute CG jumper 47 is pivotally supported with respect to the minute CG jumper support shaft 471 on one end side. A minute CG jumping portion 472 is provided at the other end of the minute CG jumper 47. The minute CG jumper 47 is urged by the minute CG jumper spring 48 and presses the minute CG jumping portion 472 against the minute CG intermediate pinion 452 of the minute CG intermediate wheel 45.
Further, the top portion of the minute CG jump control portion 472 is substantially at the center of each tooth portion of the minute CG intermediate pinion 452, and the rotation stop position of the minute CG intermediate wheel 45 is restricted by the inclined surface with substantially equal pressing force. .

[Minute CG car]
The minute CG wheel 46 includes a minute CG wheel true 461, a minute CG gear 462 and a heart cam 463 fixed to the minute CG true wheel 461. The minute CG gear 462 meshes with the minute CG intermediate pinion 452 of the minute CG intermediate wheel 45, and the rotational force of the minute CG intermediate wheel 45 is transmitted.

  The minute CG wheel stem 461 is provided with the minute CG hand 3B. The dial plate 2 is composed of two upper and lower plates, and the dial plate on the surface side is notched at the portion where the minute CG hand 3B, the second hand 2C, and the power reserve hand 4 are arranged, so that the dial plate 2 is a single plate. It is configured. Thereby, the arrangement | positioning height of each hand can be made low, and it is made not to interfere with the hour hand 2A etc. FIG.

[Chronograph nulling mechanism]
Next, a configuration for mechanically performing a zero return operation using the heart cams 362 and 463 of each second CG wheel 36 and minute CG wheel 46 will be described with reference to FIG. The configuration of the present embodiment is the same as that of the mechanism described in Japanese Patent No. 42444633.
Here, the button 6 is a button for performing a chronograph start / stop operation, and the button 7 is a button for performing a reset operation.

  In the present embodiment, a transmission lever 610, a hammer transmission lever 620, a hammer transmission lever 630, an operation lever 640, a chronograph setting lever 650, and a zero return press 660 are provided as a configuration for performing a zero return operation.

The transmission lever 610 is a lever that can rotate around a shaft 611 when the button 7 is pressed.
One end of the transmission lever 610 is connected to one end of the hammer transmission lever 620 via a shaft and a track hole.

  The hammer transmission lever 620 is a lever that can rotate around a shaft 621. At the other end of the hammer transmission lever 620, an operating shaft 622 having two stepped portions having different diameters is planted. The large diameter portion of the operating shaft 622 is engaged with a substantially rectangular hole 632 of the hammer 630. The small diameter portion of the operating shaft 622 is engaged with the click spring 661. The click spring 661 is a member for positioning the hammer transmission lever 620 and is integrally formed with the zero return press 660.

A hammer 630 that is interlocked with the hammer transmission lever 620 is provided so as to be rotatable about a rotation shaft 631. The hammer 630 is provided with a hammer-like second return zero part 633 that contacts the heart cam 362 of the second CG wheel 36 and a hammer-like zero return part 634 that contacts the heart cam 463 of the minute CG wheel 46. Yes.
The hammer 630 has a substantially triangular hole 635 in addition to the substantially rectangular hole 632, and is engaged with an operating shaft 641 formed on the operating lever 640.

The operation lever 640 is provided so as to be rotatable about a rotation shaft 642 and is rotated by contacting the button 6. Further, the operation lever 640 is integrally formed with a switch input terminal 643, and when the start / stop button 6 is pushed, it is electrically connected to a circuit board (not shown) to control the CG motor 31 on / off. It has been made possible.
Further, the operating lever 640 is formed with a shaft 644. The shaft 644 is engaged with a click spring 662 formed on the nulling presser 660.

The chronograph setting lever 650 is provided so as to be rotatable about a rotation shaft 651. Further, one end of the chronograph setting lever 650 is in contact with the shaft 652, thereby biasing the setting portion 653 into contact with the second CG second intermediate wheel 34.
The chronograph setting lever 650 has a beak-shaped tip 654 that can be engaged with the engaging portion 645 of the operating lever 640 and a hole 655 that can be engaged with the engaging portion 623 of the hammer transmission lever 620. Is provided.

As described above, since the same configuration as that of Japanese Patent No. 42444633 is provided, when the buttons 6 and 7 are operated, the operations described in detail in the above publication are performed. Therefore, although not described in detail, the operation is summarized as follows.
That is, during the start operation of the chronograph, the operation lever 640 is pushed by pushing the start / stop button 6, and the operation shaft 641 moves through the hole 635 to the outer peripheral side of the watch. For this reason, the hammer 630 rotates in the clockwise direction in FIG. 2 around the rotation shaft 631, and the hammer 362 and 463 are located at positions where the second return zero part 633 and the minute return zero part 634 are separated from the heart cams 362 and 463. The lever 630 is moved.
At the same time, the engaging portion 645 contacts the tip portion 654 and moves the chronograph setting lever 650 to release the setting of the second CG second intermediate wheel 34 by the setting portion 653.

Further, the switch input terminal 643 is connected to the start / stop input pattern, the start switch input is turned ON, and the chronograph measurement is started.
The operating shaft 622 of the hammer transmission lever 620 is moved to the starting position of the recess at the tip of the click spring of the click spring 661. The hammer transmission lever 620 moves the transmission lever 610 to a position where the reset button 7 can be operated. When the operation of the start / stop button 6 is released, the operation lever 640 is returned to the fixed position by the click spring 662 and is held, and the other levers are held in their positions.

  When the stop operation is performed, the start / stop button 6 is pressed to push the operating lever 640 to the position over the concave slope of the click spring 662 to connect the switch input terminal 643 to the start / stop input pattern and stop. The input is turned on, the chronograph measurement is stopped, and the chronograph time can be read. At this time, the other levers do not operate. When the operation of the start / stop button 6 is released, the operation lever 640 is returned to and held at the same fixed position as the start operation by the click spring 662.

  In the zero return operation, in the chronograph stop state, the transmission lever 610 is pushed by the pressing operation of the reset button 7, and the hammer transmission lever 620 is moved to the next position from the fixed position when the click spring 661 is stopped. The hole is moved to the slope portion of the zero return fixed position, and the hole 632 is pushed by the operating shaft 622. As a result, the hammer 630 moves counterclockwise about the rotation shaft 631. Then, each second return zero part 633 and minute return zero part 634 press the heart cams 362 and 463 of the second CG wheel 36 and the minute CG wheel 46 to return to zero. At the same time, since the engaging portion 623 also moves, the setting portion 653 of the chronograph setting lever 650 presses against the second CG second intermediate wheel 34 with the spring force of the chronograph setting lever 650 and sets it. At this time, the reset switch is turned ON to reset the electronic circuit.

[Drive operation of second and minute CG vehicles]
Next, the operation of the second CG wheel 36 and the minute CG wheel 46 during the chronograph operation will be described.
When the chronograph is started by operating the button 6, the CG motor 31 and the CG wheel train 32 cause the second CG wheel 36 to move counterclockwise in FIGS. 5 and 6 (in the direction of arrow R1 in FIG. Start rotating clockwise (see clockwise). Then, when almost one round, as shown in FIG. 6, the claw portion 42C of the minute CG feed claw 42 is engaged with the tooth portion 451A of the minute CG intermediate gear 451.

When the second CG wheel 36 further rotates while the claw portion 42C and the tooth portion 451A are engaged, the minute CG intermediate wheel 45 rotates in the clockwise direction (arrow R2 direction) in FIG.
Since the minute CG intermediate pinion 452 of the minute CG intermediate wheel 45 is engaged with the minute CG gear 462, the minute CG wheel 46 is rotated counterclockwise in FIG. 5 (clockwise as viewed from the clock face side). . Further, the minute CG jumper 47 is gradually pushed up by the tooth portion of the minute CG intermediate pinion 452.

Then, when the minute CG intermediate wheel 45 and the minute CG wheel 46 continue to rotate due to the rotation of the second CG wheel 36, the tooth portion of the minute CG intermediate pinion 452 is replaced by the minute CG jumping portion 472 as shown in FIG. 7. Reach the apex. At this time, the claw portion 42C is still engaged with the tooth portion 451A.
When the second CG wheel 36 further rotates from the state of FIG. 7, the engagement between the claw portion 42C and the tooth portion 451A is released. At this time, the minute CG intermediate wheel 45 is not rotated to the equivalent of one minute of the minute CG wheel 46.
However, when the tooth portion of the minute CG intermediate kana 452 gets over the apex of the minute CG jump control portion 472, the minute CG intermediate wheel 45 is rotated in the clockwise direction R2 by the slope of the minute CG jump control portion 472, and is shown in FIG. It will be in the state restricted to the rotation stop position shown. Accordingly, the minute CG wheel 46 is also rotated to a position corresponding to one minute.

  By repeating such driving, the minute CG wheel 46 rotates by one pitch every time the second CG wheel 36 makes one rotation, that is, is intermittently driven by one minute. Since the minute CG hand 3B is attached to the minute CG wheel 46, the minute CG hand 3B rotates by one step (12 degrees) and can indicate a scale at intervals of one minute.

In the present embodiment, when the second CG wheel 36 is rotated once (60 seconds) by the CG motor 31, the minute CG feed claw 42 is engaged with the minute CG intermediate wheel 45 and the minute CG wheel 46 is rotated. Is about 4 seconds. That is, since the minute CG feed claw 42 is not engaged with the minute CG intermediate wheel 45 while the second CG hand 3A of the second CG wheel 36 indicates 0 second to about 56 seconds after the chronograph operation is started, A load for driving the minute CG wheel 46 is not generated. This period is a low load torque period in which only the second CG wheel 36 needs to be driven as the driving load of the CG motor 31.
On the other hand, while the second CG hand 3A indicates about 56 seconds to about 60 seconds, the minute CG feed pawl 42 is engaged with the minute CG intermediate wheel 45, and thus a high load torque period is set.
In the present embodiment, as described later, the drive control of the CG motor 31 is switched between the low load torque period and the high load torque period.

[Returning to zero and minute CG cars]
Next, an operation when the reset button 7 is pressed to return the second CG hand 3A and the minute CG hand 3B to zero will be described.
As described above, in the second CG wheel 36, the second CG true 361 and the second CG gear 363 are integrated by the frictional force generated by the slip spring 365, so that the heart cam 362 is moved to the second return zero portion 633 of the hammer 630. If a force greater than the frictional force is applied by hitting with, the second CG true 361 rotates with respect to the second CG gear 363, and the second CG hand 3A also returns to the 0 position.
Note that the minute CG feed claw 42 attached to the minute CG feed claw stop seat 41 may engage with the minute CG intermediate wheel 45 during the zero return operation of the second CG wheel 36. This is the same as the zero return operation of the minute CG wheel 46 described below.

  On the other hand, since the minute CG wheel 46 is integrated with the heart cam 463, when the heart cam 463 is hit by the minute return portion 634 of the hammer 630, the minute CG wheel 46 and the minute CG intermediate wheel 45 rotate together. Then, the minute CG hand 3B also returns to the 0 position.

At this time, the tooth portion 451A of the minute CG intermediate wheel 45 may come into contact with the claw portion 42C. In this case as well, the minute CG feed claw 42 escapes, so that the rotation of the minute CG intermediate wheel 45 is not restricted. The minute CG hand 3B can be returned to the 0 position.
A detailed description will now be given of the zero return operation of the CG wheel 46. The minute CG wheel 46 has a different rotation direction when returning to zero depending on the position of the heart cam 362. And how to escape the minute CG feed claw 42 differs depending on the rotation direction at the time of return to zero. FIG. 8 shows a case where the minute CG intermediate wheel 45 rotates relative to the second CG wheel 36 in the direction of arrow R3 (counterclockwise direction in the drawing), and FIG. 9 shows the reverse direction (direction of arrow R4). This is the case when it is rotated.

As shown in FIG. 8, when the minute CG intermediate wheel 45 rotates in the R3 direction and returns to zero, the minute CG feed claw 42 urged by the spring portion 43A is applied with a force greater than the spring force. The first guide portion 42A and the minute CG feed claw guide portion 41A rotate in the R5 direction with the contact portion as a fulcrum. At this time, the second guide portion 42B is separated from the minute CG feed claw guide shaft 412.
In this way, the minute CG feed claw 42 moves from the position indicated by the two-dot chain line in FIG. 8 to the position indicated by the solid line. Accordingly, the claw portion 42C is removed from the rotation locus of the tooth portion 451A of the minute CG intermediate wheel 45, and the minute CG intermediate gear 451 and the minute CG wheel 46 are rotated to the 0 position without being obstructed by the minute CG feed claw 42.

As shown in FIG. 9, when the minute CG intermediate wheel 45 rotates in the R4 direction and returns to zero, the minute CG feed claw 42 biased by the spring portion 43A is applied with a force greater than the spring force. Then, the second guide portion 42B and the minute CG feed claw guide shaft 412 rotate in the R6 direction around the rotation center. At this time, the first guide part 42A is separated from the minute CG feed claw guide part 41A.
Thus, the minute CG feed claw 42 moves from the position indicated by the two-dot chain line in FIG. 9 to the position indicated by the solid line. Accordingly, the claw portion 42C is removed from the rotation locus of the tooth portion 451A of the minute CG intermediate wheel 45, and the minute CG intermediate gear 451 and the minute CG wheel 46 are rotated to the 0 position without being obstructed by the minute CG feed claw 42.

  In order to perform the above operation, the minute CG wheel 46 is not provided with a slip structure such as the slip spring 365 of the second CG wheel 36. However, the minute CG wheel 46 may also be provided with a slip structure. That is, the minute CG wheel stem 461, the heart cam 463, and the minute CG hand 3B may be configured to rotate by slipping with respect to the minute CG gear 462. In this case, the minute CG gear 462 and the minute CG intermediate wheel 45 are stopped at positions regulated by the minute CG jumper 47. At this time, even when the minute CG feed claw 42 comes into contact with the tooth portion 451A of the minute CG intermediate wheel 45 by the zero return operation of the second CG wheel 36, the minute CG feed claw 42 is moved by the operation of FIGS. In order to escape, the zero return operation of the second CG wheel 36 is not hindered.

[Power reserve display]
As shown in FIG. 2, the power reserve display means 50 includes a duration display motor 51, an intermediate wheel 52 rotated by the duration display motor 51, a display wheel 53 rotated by the intermediate wheel 52, and a display. And a power reserve needle 4 attached to the vehicle 53. Since this power reserve display means 50 is also a conventionally known general configuration, description thereof is omitted.

[Motor drive circuit]
Next, drive control of each motor in the present embodiment will be described.
FIG. 10 is a circuit block diagram of the electronic timepiece 1.
The electronic timepiece 1 includes a power generation means 10, a rectification means 71, a current detection means 72, a secondary battery 73 as a power source, a duration calculation means 74 constituted by an integration means, a duration display control means 75, and a duration display. Motor drive means 76, duration display motor 51, oscillation means 81, frequency dividing means 82, time display control means 83, time display motor drive means 84, basic timepiece motor 21 for time display, CG display control means 91, CG motor driving means 92, CG motor 31, and high load torque detecting means 93 are provided.

As described above, the power generation means 10 includes the power generation device 11 and is configured to perform automatic power generation using the rotary weight 16 and manual winding power generation using the crown 5.
The rectifying means 71 rectifies the alternating current output from the power generation device 11, and a known rectifier circuit such as a full-wave rectifier circuit or a half-wave rectifier circuit can be used.
As the current detection means 72, a known current detection circuit configured to be able to detect the magnitude of the current rectified by the rectification means 71 can be used.

  The power source is composed of a secondary battery 73 capable of charging a generated current. The output of the power generation device 11 is rectified by the rectifying means 71 and charged in the secondary battery 73 via the current detecting means 72. The power source is not limited to the secondary battery 73, and a capacitor may be used. Further, when the power generation means 10 is not provided, a primary battery or the like may be used as a power source.

  The duration calculation unit 74 calculates the duration from the charging current by the power generation unit 10 and the consumption current in the electronic timepiece 1. Specifically, it is constituted by an integrating means such as a counter. The duration calculation means 74 calculates an average charging current value based on the detection result signal output from the current detection means 72, integrates the average charging current value to increase the duration, and the basic timepiece motor 21. The remaining duration is calculated by subtracting the duration by integrating the average consumption current value when driving and the average consumption current value when driving the CG motor 31.

The duration display control means 75 controls the duration display motor drive means 76 based on the output of the duration calculation means 74.
The duration display motor driving means 76 controls driving of the duration display motor 51 by inputting a drive pulse to the duration display motor 51 based on the drive control signal output from the duration display control means 75. is doing.
The duration display control means 75 calculates the duration based on the average current consumption value when the basic timepiece motor 21 is driven when the chronograph mechanism is not operated, and the duration position The duration display motor 51 is controlled so as to instruct.
On the other hand, when the chronograph mechanism is operated, the duration display control means 75 calculates the duration based on the average current consumption value when the CG motor 31 is driven, and determines the duration position. The duration display motor 51 is controlled as instructed.
Thus, the duration display control means 75 switches the duration display according to the actual operation mode.

On the other hand, the circuit configuration for displaying the normal time is a configuration of a conventional general analog quartz timepiece, and thus detailed description thereof is omitted.
That is, the oscillating means 81 is composed of a crystal resonator and outputs a signal having a predetermined frequency. The frequency dividing means 82 divides the signal from the oscillating means 81 and outputs a reference signal of 1 Hz, for example.
The time display control unit 83 outputs a drive signal to the time display motor driving unit 84 based on the reference signal of the frequency dividing unit 82. Normally, each time a 1 Hz reference signal is input from the oscillation means 81, a drive signal is output. The time display motor driving means 84 inputs the drive signal to the basic timepiece motor 21, and the basic timepiece motor 21 steps the hour hand 2A, the minute hand 2B, and the second hand 2C.
Note that the time display motor drive means 84 is configured to shift to a sleep mode in which the hand movement is stopped when the duration becomes 0 by a control signal from the duration display control means 75.

[Chronograph control circuit]
Next, a chronograph control circuit that is a control unit that drives and controls the CG motor 31 will be described. The chronograph control circuit includes CG display control means 91, CG motor drive means 92 as drive pulse output means, and high load torque detection means 93 as torque period detection means.

The CG display control means 91 detects the start and stop of the chronograph operation by operating the button 6 and outputs a control signal to the CG motor driving means 92 according to the operation.
At this time, as described above, after the chronograph operation is started, the low load torque period (0 second to about 56 seconds) until the minute CG feed pawl 42 is engaged with the minute CG intermediate wheel 45, and the high load being engaged. The torque period (about 56 seconds to about 60 seconds) repeatedly occurs.
For this reason, the high load torque detection means 93 measures the elapsed time from the start of operation of the chronograph mechanism, determines the low load torque period from 0 seconds to 56 seconds, and 56 seconds to 60 seconds (0 seconds). ) During the high load torque period.
The CG display control means 91 controls the CG motor drive means 92 so that a drive pulse for high torque output is output when the high load torque detection means 93 determines that the load period is high. .

  As shown in FIG. 11A, the CG motor driving unit 92 outputs a driving pulse P1, which is a first driving pulse for driving the second CG wheel 36, at regular intervals during the low load torque period. In this embodiment, since the second CG wheel 36 is driven by 1/10 second hand movement, the drive pulse P1 for driving the CG motor 31 is output at intervals of 0.1 second. For this reason, 600 drive pulses are output in 60 seconds. Among them, about 560 driving pulses P1 are output in the low load torque period (0 second to about 56 seconds). In FIG. 11, the width of the drive pulse is shown larger than the output interval of each drive pulse so that the difference in the width of each drive pulse can be grasped.

  After the drive pulse P1 is output, a rotation detection pulse for detecting the rotation of the CG rotor 31A of the CG motor 31 is output from the CG motor driving means 92. When the level of the detection pulse is less than the threshold value, the non-rotation of the CG rotor 31A is detected. Detected. In this case, the CG motor driving means 92 outputs a correction driving pulse P2 having an output torque larger than that of the driving pulse P1, and reliably rotates the CG rotor 31A. Accordingly, the CG display control unit 91 and the CG motor driving unit 92 constitute a rotation determination unit that determines whether or not the CG rotor 31A of the CG motor 31 has rotated.

On the other hand, in the high load torque period, the CG motor driving unit 92 outputs a drive pulse P3 that is a second drive pulse corresponding to a high load, as shown in FIG. During this high load torque period (about 56 seconds to about 60 seconds), about 40 drive pulses P3 are output.
Here, the pulse widths of the drive pulses P1 to P3 are set to, for example, 2.9 msec, 3.9 msec, and 7.8 msec. That is, in this embodiment, the energy of each drive pulse P1 to P3 is set by changing the pulse width of the drive pulse. For this reason, the output torque of the CG motor 31 can be easily set.

FIG. 12 shows the relationship between the pulse widths of these drive pulses P1 to P3 and the minute hand output torque. For example, in the driving pulse P1, the minute hand output torque is 1 × 10 ⁻⁴ Nm. Further, in the correction drive pulse P2, the minute hand output torque is 2 × 10 ⁻⁴ Nm. Further, in the driving pulse P3, the minute hand output torque is 3 × 10 ⁻⁴ Nm.

Here, when the minute hand output torque 3 × 10 ⁻⁴ Nm is converted into the second hand output torque, assuming that the reduction ratio is 1/60 and the transmission efficiency per stage is 90%, 3 / (60 × 0.9 ² ) = 6.2 × 10 ⁻⁶ Nm. With regard to the second CG wheel 36 of the present embodiment, since it is a 1/10 second hand movement, it becomes 10 times the normal second hand output torque, and becomes 6.2 × 10 ⁻⁵ Nm.
If the load torque of the present embodiment is 2 × 10 ⁻⁵ Nm in the second CG wheel 36, the safety factor of the drive torque with respect to the load torque is 6.2 / 2 = 3.1, and the chronograph component CG even with the drive force of the step motor. The intermittent feeding of the vehicle 46 can be realized.

Further, as shown in FIG. 13, the current consumption during driving of the CG motor 31 increases as the pulse width of the drive pulse increases. However, since the low load torque period and the high load torque period are known in advance, the energy consumption can be calculated from the elapsed time of the chronograph drive.
Therefore, the high load torque detection means 93 detects the start and end of the high load torque period and notifies the duration calculation means 74 so that the duration calculation means 74 accurately grasps the energy consumption of the chronograph drive operation. And the duration can be displayed.

In the present embodiment, when the chronograph is driven (when CG is driven), the CG motor 31 moves 1/10 second in addition to the movement of the basic timepiece motor 21 every second. For this reason, during CG driving, the motor current consumption is 11 times that during CG non-driving.
Therefore, the duration calculation means 74 and the duration display control means 75 calculate and display the duration when the normal hand movement is continued when the CG is not driven, and when the CG drive is continued as it is when the CG is driven. The duration of is calculated and displayed.
Therefore, the user can know how to use the remaining energy (duration) and use it according to the remaining energy.

According to this embodiment, there are the following effects.
(1) The electronic timepiece 1 detects a low load torque period in which only the second CG wheel 36 is driven and a high load torque period in which the minute CG wheel 46 is also driven by the high load torque detecting means 93 when the chronograph is driven. In the low load torque period, the drive pulse P1 with low current consumption is output, and in the high load torque period, the current consumption increases, but the drive pulse P3 that can reliably drive the minute CG wheel 46 is output. For this reason, the CG wheel 46 can be reliably driven as much as the load becomes temporarily high, and the current consumption can be reduced and the duration can be increased compared to the case where the drive pulse P3 is output even during the low load torque period. .

(2) When the minute CG wheel 46 is driven by a gear rotated by the CG motor 31, the minute CG hand 3 </ b> B rotates little by little every rotation step of the CG motor 31. For this reason, the minute CG hand 3B does not always indicate a scale, and there is a problem that it is difficult to read at the time of reading after measurement.
On the other hand, in the present embodiment, the second CG wheel 36 and the minute CG wheel 46 are driven by the CG motor 31 and the intermittent feeding of the minute CG wheel 46 is realized, so that the minute CG hand 3B always has a scale. Pointing and reading ability can be greatly improved.

(3) Since the duration can be displayed by the duration display motor 51 and the power reserve hand 4, the user can check the remaining duration of the electronic timepiece 1, and the electronic timepiece 1 stops without the user's intention. Can be prevented.
Furthermore, when the CG mechanism is driven, the duration when the drive is continued is displayed. When the CG mechanism is not driven, the duration when only the basic clock is activated is displayed. It is possible to accurately grasp whether the operation can be continued for a certain amount of time.

(4) Even when driven by the first drive pulse P1, when the CG rotor 31A is not rotating, the correction drive pulse P2 is output, so that the CG rotor 31A can be reliably rotated. Further, since the correction drive pulse P2 is output at the time of non-rotation, the first drive pulse P1 can be set to a pulse having a somewhat small energy, and therefore, energy consumption in a low load torque period can be reduced.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
As shown in FIG. 14, the electronic timepiece 100 of this embodiment includes a date display mechanism 200. The date display mechanism 200 includes a first date plate 220, a first date drive mechanism 230, a tenth date plate 240, and a tenth date drive mechanism 250. The first date plate 220 and the tenth date plate 240 are visible from a date display window formed on a dial plate (not shown).

[Configuration of 1st date plate and 1st date drive mechanism]
The first date plate 220 is formed in a substantially annular shape, and a plurality of first scales indicating the first digit of the date are arranged on the surface facing the dial. Specifically, on the first date plate 220, 31 first scales 221 are evenly arranged at predetermined intervals in an annular area facing the first date display hole 201. As shown in FIG. 14, these first-order scales 221 are arranged in order along the clockwise direction from the first scale 221A from “1” to “9”, and then from the middle scale from “0” to “9”. 221B, followed by a late scale 221C from “0” to “9”, followed by two non-display scales 221D in which numbers are not displayed are arranged in succession.

Further, the first date plate 220 is formed with five tenth drive teeth 222 protruding along the inner peripheral surface. Specifically, the tenth drive teeth 222 are respectively positioned between “1” and “2” of the first scale 221A on the inner peripheral surface of the first date plate 220, and “2” and “3”. Between “1” and “2” of the middle scale 221B, between “1” and “2” of the late scale 221C, and between “1” of the non-display scale 221D and the early scale 221A It is provided in the position to do.
The 1st date dial 220 is connected to the 1st date indicator 232 of the 1st date drive mechanism 230 by a connecting member 223 and is driven to rotate along the outer peripheral edge of the movement in conjunction with the 1st date indicator 232.

The first date driving mechanism 230 includes a date indicator driving wheel 231, a first date driving wheel 232, and a first jumper 233.
The date indicator driving wheel 231 meshes with a date drive transmission gear 102B that rotates integrally with an hour wheel to which an hour hand of a basic timepiece is attached, and a driving force is transmitted from the date drive transmission gear 102B to be driven to rotate. Here, the date driving wheel 231 is set to a 1/2 gear ratio with respect to the date drive transmission gear 102B, and this date driving wheel 231 rotates once while the date drive transmission gear 102B rotates twice. To do. That is, the date driving wheel 231 makes one rotation in 24 hours.

The date indicator driving wheel 231 has teeth that can mesh with the date drive transmission gear 102B, and one of these teeth constitutes a date dial driving tooth 231A that protrudes to the outer diameter side from the other teeth. . The date dial driving teeth 231A can be meshed with the first driving teeth 232A provided on the inner peripheral surface of the first date driving wheel 232. As a result, the date indicator driving wheel 231 drives the first date indicator 232 only when the date indicator driving tooth 231A meshes with the first driving tooth 232A during rotation. That is, the date indicator driving wheel 231 advances the first date indicator 232 one step at a frequency of once every 24 hours.
Further, the date indicator driving wheel 231 is circular in the clockwise direction along the outer peripheral edge of the date indicator driving wheel 231 from between the date indicator driving tooth 231A and the teeth adjacent in the counterclockwise direction of the date indicator driving tooth 231A. An arc-shaped cutout 231B is formed. Accordingly, one piece portion provided with the date dial driving tooth 231A at the tip on the outer peripheral side from the notch portion 231B has elasticity. For example, when correcting the date manually, excessive stress is applied to the date dial driving tooth 231A. Since the buffering force acts even when applied to the wheel, it is possible to prevent the date indicator driving teeth 231A from being damaged.

  The first date indicator 232 is an annular member that is rotatably disposed along the outer peripheral edge of the guide plate 205. The 1st date dial 232 is stacked on the 1st date plate 220. As described above, the 1st date indicator 232 includes the date plate connecting piece 232B protruding in the outer diameter direction, and the 1st date indicator 232 and the 1st date date plate 220 are connected via the connecting member 223. Have been integrated. Therefore, the 1st date date wheel 232 and the 1st date date plate 220 are integrally rotated by the driving force of the date driving wheel 231.

  Thirty-one first drive teeth 232A are arranged at equal intervals on the inner peripheral surface of the first date indicator 232. The 1st date indicator 232 is rotated by one pitch when the date indicator driving tooth 231A of the date indicator driving wheel 231 is engaged with one of the 1st position driving teeth 232A and driven to rotate. Thereby, the 1st date plate 220 also rotates counterclockwise, and the 1st scale displayed from the 1st date display hole 201 is switched to the next 1st scale.

  Note that a first jumper 233 is engaged with the first drive tooth 232A. For this reason, when the 1st date indicator 232 is rotated by one pitch with the date indicator driving wheel 231, the position after the rotation is regulated by the 1st place jumper 233. Accordingly, the first date plate can be set so that the first scale 221 can be reliably displayed from the first date display hole 201 and the date dial driving tooth 231A is not engaged with the first driving tooth 232A. The position of 220 can be prevented from shifting.

[Configuration of 10th date plate and 10th date drive mechanism]
The tenth date plate 240 is formed in a substantially disk shape and is rotatably held by the tenth date wheel shaft 241. The tenth date plate 240 has a tenth scale 242 indicating the tenth digit of the date and the first digit of the last day of the month ("30th" and "31st") on the surface facing the dial. Has been.
Specifically, five tenth scales 242 are evenly arranged on the tenth date plate 240. The tenth scale 242 includes a normal tenth scale 242A and a month end tenth scale 242B.

Normally, the tenth scale 242A has one of “0”, “1”, and “2” arranged in the area facing the tenth date display hole 202, and is displayed first in the area facing the first date display hole 201. It is a scale in which the hole 243 is formed. On the other hand, the end-of-month tenth scale 242B is a scale in which “3” is arranged in the area facing the tenth date display hole 202 and “0” or “1” is arranged in the area facing the first date display hole 201. It is.
In the tenth date plate 240, a tenth scale 242 is arranged in the order of a normal tenth scale 242A and a month end tenth scale 242B in the clockwise direction, and the normal tenth scale 242A is further clockwise. The tenth digit 242B at the end of the month is “0”, “1” in the clockwise direction so that the tenth digit is “0”, “1”, “2” along the clockwise direction. Are arranged as follows.

The tenth date driving mechanism 250 includes a tenth date indicator 251 and a tenth date jumper 252. FIG. 15 is an enlarged view of the tenth date driving mechanism 250 in FIG.
The tenth date wheel 251 is coaxial with the tenth date wheel 240, that is, fixed to the tenth date wheel shaft 241, and is driven to rotate in conjunction with the tenth date wheel 240. In the tenth date indicator 251, as shown in FIG. 15, five engagement teeth 251A are evenly arranged on the outer peripheral surface in the circumferential direction. These engagement teeth 251A are provided so as to be able to engage with the tenth drive tooth 222 of the first date plate 220, and the tenth drive tooth 222 is engaged with the engagement teeth 251A by the rotation of the first date plate 220. The tenth date wheel 251 is driven to rotate.

Here, at the timing when the tenth date indicator 251 is rotated by the tenth position driving tooth 222 provided between “2” and “3” of the first scale 221A on the first date plate 220, the first date display hole is provided. The first tenth scale 221A “1” on the first date plate 220 moves opposite to the 201, and the tenth date 240 on the tenth date display hole 202 faces the tenth date display hole 202. 242A moves. Therefore, the date “01” is displayed.
Similarly, at the timing when the tenth date indicator 251 is rotated by the tenth position driving tooth 222 provided between “1” and “2” of the middle scale 221B on the first date plate 220, the tenth date display is performed. “1” of the tenth date plate 240 is displayed in the hole 202, and “0” of the first date plate 220 is displayed in the first date display hole 201.
Further, at the timing when the tenth date indicator 251 is rotated by the tenth position driving tooth 222 provided between “1” and “2” of the late scale 221C in the first position date plate 220, the tenth date display hole 202 is provided. “2” of the tenth date plate 240 is displayed, and “0” of the first date plate 220 is displayed in the first date display hole 201.

  On the other hand, at the timing when the tenth date wheel 251 is rotated by the tenth position driving tooth 222 provided between the non-display scale 221D and the first scale 221A of the first position dateplate 221A, The date “30” is displayed. Further, at the timing at which the tenth date wheel 251 is rotated by the tenth position driving tooth 222 provided between “1” and “2” of the first scale 221 </ b> A in the first position dateplate 220, The date “31” is displayed.

[Ten position feed timing detection means]
In the present embodiment, a tenth-place feed timing detection unit that detects the rotation timing of the tenth date indicator 251 and functions as a torque period detection unit is provided. As shown in FIGS. 16 and 17, the tenth feed timing detection means includes a contact spring 260 integrally attached to the tenth date indicator 251 and conductive patterns 271 and 272 formed on the circuit board 270. Has been.

The contact spring 260 is formed with five contact portions 261 extending in the same direction as the five engagement teeth 251A of the tenth date indicator 251.
The contact spring 260 is configured to be able to contact conductive patterns 271 and 272 formed on the circuit board 270. When the tenth date plate 240 and the tenth date indicator 251 are stopped, the contact portion 261 is in contact with only one conduction pattern 271, and the contact portion 261 is not in contact with the other conduction pattern 272. It becomes a state. For this reason, if a potential is applied to one of the conduction patterns 271 and 272, the potential of each conduction pattern 271 and 272 is different, and therefore the control circuit stops the tenth date plate 240 and the tenth date indicator 251. Can be detected.

  On the other hand, during rotation of the tenth date plate 240 and the tenth date dial 251, the contact portions 261 of the contact spring 260 simultaneously contact the conductive patterns 271 and 272. For this reason, when a potential is applied to one of the conduction patterns 271 and 272, the conduction patterns 271 and 272 are conducted by the contact spring 260 so that the respective potentials are the same. It can be detected that the date plate 240 is rotating.

  Each date indicator 232, 251 of the date display mechanism is driven when the basic clock is switched to 0 o'clock. In this case, in the case of a low load torque period in which only the date indicator 232 is rotated by the date to be switched. And there may be a high load torque period in which both the tenth date indicator 251 and the first date indicator 232 rotate. Therefore, while the tenth date indicator 251 and the tenth date dial 240 are detected to be rotating based on the output of the conduction pattern 271, the control circuit can determine that the period is a high load torque period.

As in the first embodiment, the electronic timepiece 100 includes an oscillating means 81, a frequency dividing means 82, a time display control means 83, a time display motor driving means 84, and a basic timepiece motor 21. The basic timepiece motor 21 drives the hour and minute hands and drives the date dials 232 and 251 of the date display mechanism.
At this time, the torque necessary for driving only the 1st date indicator 232 is about the same as the normal daily feed torque (2 to 3 × 10 ⁻⁵ Nm in minute hand output torque). On the other hand, when the tenth date indicator 251 is also driven simultaneously, a minute hand output torque of about 7 to 8 × 10 ⁻⁵ Nm is required. For this reason, when driving the tenth date wheel 251, the margin of the drive torque with respect to the load torque is reduced.
Further, the date driving wheel 231 is driven by transmission of power from the hour wheel with a gear, and is configured to rotate once in 24 hours. Since the reduction ratio is determined, the reduction ratio is increased to increase the torque. Can't get.
Therefore, in the present embodiment, the tenth-place feed timing detection means is provided, and the time display control means 83 uses the basic timepiece motor 21 in advance with a pulse for high torque output only during the high load torque period during which the tenth date indicator 251 is driven. Is controlled to drive.

In this embodiment as well, the same effect as the first embodiment can be obtained.
That is, during the low load torque period, the basic timepiece motor 21 is driven by a low torque output pulse with a narrow pulse width and a small current consumption, and during the high load torque period, the high torque with a wide pulse width and a high current consumption. Since the basic timepiece motor 21 is driven by the output pulse, the date wheels 232 and 251 can be reliably driven even during the high load torque period, and the high torque output pulse is output only during the high load torque period. An increase in current consumption can be suppressed.

  Further, since the contact spring 260 that rotates integrally with the tenth date indicator 251 and the conduction patterns 271 and 272 are provided as tenth feeding timing detection means, it is determined whether the tenth date indicator 251 is actually rotating. Can be detected automatically. For this reason, for example, the internal clock is initialized by battery replacement or the like, and the tenth date wheel 251 is rotating even when the hands and the positions of the date dials 232 and 251 are not synchronized with the internal clock. This can be reliably detected and the drive can be controlled.

[Other Embodiments]
It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements and the like within a scope that can achieve the object of the present invention are included in the present invention.

For example, the torque period detecting means is not limited to that of the above embodiment. That is, in the first embodiment, it is only necessary to detect that the minute CG feed claw 42 is engaged with the minute CG intermediate gear 451. In the second embodiment, the tenth date indicator 251 and the tenth date What is necessary is just to be able to detect that the plate 240 is rotating.
For example, the torque period detection means may be an optical sensor, a magnetic sensor, or the like that detects the position of the minute CG feed claw 42 or the rotation of the tenth date plate 240. Further, the contact of the minute CG feed claw 42 and the minute CG intermediate gear 451, the start of rotation of the tenth date wheel 251 and the tenth date plate 240, that is, the start point of the high load torque period is detected by a contact or the like. The end of the period may be detected by counting with a counter or timer.

  In addition, as a torque period detection means, when detecting a high load torque period, such as the elapsed time after the chronograph operation or the time when the date changes in the basic clock, the drive variation of the second CG wheel 36 or the tenth date wheel 251 and the like In consideration of the above, it is preferable to set a little wider.

In the first embodiment, the minute CG wheel 46 and the minute CG hand 3B are not limited to a 30-minute counter that rotates once in 30 minutes, but may be a 60-minute counter or a 45-minute counter. Further, the minute CG hand 3B makes one rotation, that is, the minute CG hand 3B is not limited to a circular scale, but the scale may be formed in a fan shape, and the minute CG hand 3B may be rotated within a predetermined angle range.
Further, the second CG wheel 36 and the second CG hand 3 </ b> A are not limited to those that move 1/10, but may be those that perform the same movement as a conventional CG mechanism, such as those that move 1/5 second.

In the first embodiment, the duration is indicated by the power reserve needle 4, but the time CG display is switched after a predetermined time (30 minutes or 1 hour) from the start of operation of the chronograph. You may set as follows.
Further, the instruction content of the power reserve needle 4 may be switched at any timing between a time CG display and a duration display by a user's predetermined operation.

  Furthermore, also in the second embodiment, the power reserve needle 4 may be provided to display the duration. In this case, in the date display, the timing for rotating the tenth date plate 240 can be grasped by the calendar information of the internal clock. For this reason, it is possible to calculate and display the duration in consideration of the timing of the high load torque period.

In the above-described embodiment, the drive energy is set by changing the pulse width in each drive pulse. However, the drive energy may be set by changing the voltage.
Further, the pulse width of each drive pulse in the above embodiment is merely an example, and may be set as appropriate together with various parameters of the step motor according to the required characteristics in each case such as the drive target.
Further, the pulse width of the first drive pulse P1 is not limited to a fixed one, and the pulse width may be varied to further reduce the energy consumption at low load. That is, when the rotor is rotated by the first drive pulse P1, the pulse width of the next first drive pulse P1 is narrowed to reduce energy consumption, and the rotor is non-rotated by the first drive pulse P1. When the drive pulse P2 is output and rotated, the width of the next first drive pulse P1 may be increased to control the rotor to rotate.

  Further, the first drive pulse P1 may be a comb pulse. In addition, when configured with comb-tooth pulses, the energy consumption may be further reduced by varying the duty ratio of the comb-tooth pulses depending on the result of rotation / non-rotation of the rotor.

Further, the driven part in the electronic timepiece of the invention is not limited to the ones in the above embodiments. For example, the driven unit may be periodically operated such as a moon age display mechanism, or may be operated by a user operation such as an alarm mechanism.
In short, the present invention can be widely applied to electronic devices including a driven part in which a high load torque period and a low load torque period are generated.

  DESCRIPTION OF SYMBOLS 1 ... Electronic timepiece, 2A ... Hour hand, 2B ... Minute hand, 2C ... Second hand, 3 ... CG hand, 3A ... Second CG hand, 3B ... Minute CG hand, 4 ... Power reserve hand (PR hand), 5 ... Crown, 6 ... start / stop button, 7 ... reset button, 10 ... power generation means, 11 ... power generation device, 20 ... basic clock drive means, 21 ... basic clock motor, 21A ... rotor, 22 ... basic clock train, 30 ... CG drive means 31 ... CG motor, 31A ... CG rotor, 32 ... CG train wheel, 36 ... second CG wheel, 41 ... minute CG feed claw stop, 42 ... minute CG feed claw, 42C ... claw part, 43 ... minute CG feed claw Spring, 45 ... minute CG intermediate wheel, 46 ... minute CG wheel, 47 ... minute CG jumper, 50 ... power reserve display means, 51 ... duration time display motor, 53 ... display wheel, 71 ... rectifying means, 72 ... current detection Means 73 ... secondary Pond, 74 ... duration calculation means, 75 ... duration display control means, 76 ... duration display motor drive means, 83 ... time display control means, 84 ... time display motor drive means, 91 ... CG display control means, 92 ... CG motor drive means, 93 ... High load torque detection means, 100 ... Electronic timepiece, 200 ... Date display mechanism, 220 ... First place date plate, 222 ... Tenth place drive tooth, 230 ... First place date drive mechanism, 232 ... 1st place date wheel, 233 ... 1st place jumper, 240 ... 10th place date plate, 250 ... 10th place date driving mechanism, 251 ... 10th place date wheel, 252 ... 10th place jumper, 260 ... contact spring, 261 ... contact part, 270 ... Circuit board, 271, 272 ... Conduction pattern, 361 ... Second CG true, 362 ... Heart cam, 363 ... Second CG gear, 451 ... Minute CG intermediate gear, 463 ... Heart cam, 610 ... Transmission lever , 620 ... hammer operating lever 630 ... hammer, 640 ... operating lever 650 ... chronograph setting lever, 660 ... zero-reset pressing.

Claims (7)

Step motor,
A power source for supplying power to the step motor;
A control unit for controlling the driving of the step motor;
In an electronic timepiece comprising a driven part driven by the step motor,
The driven portion generates a low load torque period that can be driven by the first torque and a high load torque period that can be driven only by a second torque higher than the first torque,
The controller is
Torque period detecting means for detecting each torque period;
Drive pulse output means for outputting a drive pulse to the step motor,
The drive pulse output means includes
When the low load torque period is detected by the torque period detection means, a first drive pulse is output, and when the high load torque period is detected by the torque period detection means, a second energy having a higher energy than the first drive pulse is output. An electronic timepiece that outputs a drive pulse. The electronic timepiece according to claim 1,
A duration display means for displaying the duration based on the remaining energy of the power source;
The duration display means includes
When operating in an operation mode in which the high load torque period periodically occurs,
Energy consumed by the first drive pulse during the low load torque period;
Energy consumed by the second drive pulse during the high load torque period;
The occurrence interval of the high load torque period;
The remaining energy of the power source;
An electronic timepiece characterized by displaying a duration calculated based on. The electronic timepiece according to claim 1 or 2,
The drive pulse output means includes
An electronic timepiece characterized in that at least one of a pulse width or a voltage of the second drive pulse is set larger than that of the first drive pulse. The electronic timepiece according to any one of claims 1 to 3,
A rotation determination unit for determining whether or not the rotor of the step motor has rotated;
The drive pulse output means includes
When the torque determination unit detects the low load torque period and outputs the first drive pulse to the step motor, the rotation determination unit determines that the rotor is not rotating, An electronic timepiece that outputs a correction driving pulse having energy larger than that of one driving pulse and lower energy than that of the second driving pulse. The electronic timepiece according to any one of claims 1 to 4,
The driven portion includes a second CG vehicle driven by the step motor;
A chronograph mechanism having a minute CG wheel that is intermittently driven by a feed claw provided in the second CG wheel;
The torque period detecting means is
The elapsed time from the start of operation of the chronograph mechanism is measured, and when the elapsed time reaches a preset feed pawl engagement period, it is determined as a high load torque period, and during other periods, the low load torque is determined. An electronic timepiece characterized by determining a period. The electronic timepiece according to any one of claims 1 to 4,
The driven portion is a calendar mechanism including a 1st date indicator driven by the step motor and a 10th date indicator driven by a 10th date driving tooth provided in the 1st date indicator,
The torque period detecting means is
An electronic timepiece that detects the start of rotation of the tenth date wheel and detects a high load torque period. The electronic timepiece according to any one of claims 1 to 6,
The power source is composed of a rechargeable secondary battery,
An electronic timepiece comprising: a power generation device that supplies power to the secondary battery; or a charging device that supplies power from an external power supply source to the secondary battery.

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