GB2042225A - Instantaneous calendar device for timepieces - Google Patents
Instantaneous calendar device for timepieces Download PDFInfo
- Publication number
- GB2042225A GB2042225A GB7906859A GB7906859A GB2042225A GB 2042225 A GB2042225 A GB 2042225A GB 7906859 A GB7906859 A GB 7906859A GB 7906859 A GB7906859 A GB 7906859A GB 2042225 A GB2042225 A GB 2042225A
- Authority
- GB
- United Kingdom
- Prior art keywords
- geneva wheel
- date ring
- locking
- disk
- storage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004146 energy storage Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B19/00—Indicating the time by visual means
- G04B19/24—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars
- G04B19/243—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars characterised by the shape of the date indicator
- G04B19/247—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars characterised by the shape of the date indicator disc-shaped
- G04B19/253—Driving or releasing mechanisms
- G04B19/25333—Driving or releasing mechanisms wherein the date indicators are driven or released mechanically by a clockwork movement
- G04B19/25373—Driving or releasing mechanisms wherein the date indicators are driven or released mechanically by a clockwork movement driven or released stepwise by an energy source which is released at determined moments by the clockwork movement
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromechanical Clocks (AREA)
Abstract
In a timepiece calender mechanism having a date ring 8 and day disc 12 and a spring storage device for rapid advance of the date ring by means of a projection 7 on the output member 6 of the storage device, the day disc is attached to a seven-lobed Geneva wheel 11 which is normally restrained by the output member 6 and holds a jumper 13, 14 in position to block the date ring. When the output member 6 is released to advance the date ring, a pin 10 thereon also advances the Geneva wheel (and day disc), thus momentarily unblocking the jumper. The use of a spring-loaded jumper is thereby avoided. <IMAGE>
Description
SPECIFICATION
Instantaneous calendar device for timepieces
The present invention relates to mechanical calender devices and can be used primarily in timepieces.
It is the object of the present invention to eiiminate the disadvantages set out below of prior art calendar devices for timepieces and to develop a novel improved mechanism for the purpose.
The present invention is aimed at solving the technical problem of modifying the cooperation of the date ring with the lock and coupling of the day disk with the storage of mechanical energy in such a manner as to reduce considerably the consumption of energy required for the functioning of the calendar device and at the same time, improve the reliability of locking in position of the date ring and the day disk.
In order to accomplish this and other objects of the present invention, there is provided an instantaneous calendar device for timepieces, comprising a date ring with a toothed rim, locked in position by a lever member, and a day disk cooperating via intermediate member with a storage of mechanical energy having a driven disk with a projection for moving said date ring; the herein disclosed device is characterized in that said driven disk of the storage is coupled with said day disk via seven-position Geneva mechanism whose Geneva wheel serves as said intermediate member while the locking arcs of said wheel close up alternately on the side surface of the driven disk carrying a pin for moving the Geneva wheel.
This technical solution helps considerably reduce the consumption of energy required forthe operation of the calendar mechanism by providing a kinematic, rather than power, closing of the date ring of the calender mechanism. In so doing, the toothed member stays immobile while the spring of the energy storage is being wound.
In accordance with one embodiment of the present invention, disclosure is made of an instantaneous calendar device for timepieces, characterized in that said Geneva wheel is rigidly coupled with the day disk for coaxial rotation therewith, the curvature of the locking surfaces of the Geneva wheel being greater than the curvature of the side surface of the driven disk of the storage.
This technical improvement offers the optimum coupling of the Geneva wheel with the day disk and the most favourable curvilinear shape and size of the locking portions of the Geneva wheel.
In accordance with another embodiment of the present invention, disclosure is made of an instantaneous calendar device for timepieces, characterized in that cooperating with projections of said
Geneva wheel, formed at the junctions of the locking surfaces thereof, is a thrust arm of said locking member of the date ring, said member presenting a free lever having a shape such that at the moment said arm is held at a projection of the Geneva wheel its locking portion is held between the teeth of the date ring, the length of said thrust arm being less than the distance from the center of rotation of the lever to the recess in the locking surface of the
Geneva wheel.
This technical solution, in particular, guarantees a free (independent of the springs) setting of the lever lock and provides, owing to precision geometry, for appropriate closing of the lever with the locking surfaces of the Geneva wheel and with the teeth of the date ring.
This invention will be better understood upon considering the following detailed description of an examplary embodiment thereof, with reference to the accompanying drawings in which:
Figure lisa general sectional view of the herein disclosed calendar device;
Figure 2 is a plan view of the device according to the invention at the moment of locking the date ring; and
Figure 3 illustrates the device shown in Figure 2, with the lever unlocked.
Referring now to Figure 1 of the accompanying drawings, set on a shaft 1 is an hour wheel 2 in mesh with a 24-hour wheel 3 of an energy storage arrangement. Mounted coaxially with the 24-hour wheel 3 is an intermittent gear 4 of the storage, said latter gear having in a sector of about 75" a recess through the depth of the teeth. The gear 4 is in mesh with a wheel 5 mounted coaxially with the hour wheel 2. Pressed in the intermittent gear 4 is a driven disk 6 of the storage having a projection 7 cooperating once a day with the date ring 8 (Figures 2, 3). A spring 9 is forced in the storage between the driven disk 6 and the 24-hour wheel 3.
The gear ratio of the hour wheel 2 and 24-hour wheel 3 relative to the wheel 5 and intermittent gear 4 is selected such that the mismatch upon rotation of these pairs is about 60 a day.
Rigidly secured on the intermittent gear 4 in the recessed sector is a pin 10 adapted to cooperate once a day with one of the grooves of a toothed member fashioned as a seven-position Geneva wheel 11 loosely-fitted on the shaft 1; a day disk 12 is rolled in the bushing of the Geneva wheel.
The lock of the date ring 8 is formed as a double-arm lever 13 whose one arm contacts projections of the next locking arc of the Geneva wheel 11 while the other, thrust arm 14 has a wedge-shaped end receivable between the teeth of the date ring 8.
The Geneva wheel 11 is rigidly coupled with the day disk 12 for coaxial rotation therewith, the curvature of the locking surfaces of the Geneva wheel 11 being greater than the curvature of the side surface of the driven disk 6 of the storage.
Cooperating with projections of the Geneva wheel 11,formed at the junctions of the locking surfaces thereof, is the thrust arm 14 of said lock of the date ring, said lock presenting a free lever 13 having a shape such that at the moment the arm 14 is held at a projection of the Geneva wheel its locking portion is held between the teeth of the date ring 8, the length of the thrust arm 14 being less than the distance from the center of rotation of the lever 13 to the recess in the locking surface of the Geneva wheel 11.
The calendar device according to the invention operates in the following manner.
Upon rotation of the clock shaft 1, the wheels 3, 4 of the storage turn in one direction, the wheel 3 overtaking the intermittent gear 4 to wind the spring 9 which stores the energy. While so doing, to the crest of one of the projections of the Geneva Wheel 11 there is interference pressed one of the arms of the lock the wedge-shaped end of whose thrust arm 14 locks the date ring 8.
The moment the intermittent gear 4 of the energy storage arrangement turns to face with its recess the mated wheel 5, it comes out of engagement and turns sharply under the effect of the spring 9. In so doing, the pin 10 enters the groove of the Geneva wheel 11 and turns the latterthrough 1/7th of a turn.
Upon turning, the Geneva wheel 11, similar to the cam, releases the lock; the projection 7 of the driven disk 6 comes to cooperate with the date ring 8 to move the latter through one step. The Geneva wheel 11 completes the turn, and the wedge-shaped end of the thrust arm 14 of the lock is again received in the recess in the date ring. Further, the cycle is repeated.
The herein disclosed calendar device is characterized by the kinematic (rather than power one) locking of the calendar date ring 8.
The locking of the date ring 8 by the lock having resilient arms serves to preclude the diverse effect of the calendar on the gear train when changing dates by hand. Inasmuch as the toothed member (irrespective of possibLe embodiments thereof) stays immobile in the course of winding the storage spring, energy losses are reduced considerably.
Claims (4)
1. An instantaneous calendar device fortimepieces, comprising: a date ring with a toothed rim; a day disk; a storage of mechanical energy coupled with the gear train and having a driven disk with a projection for moving said date ring; a sevenposition Geneva mechanism serving to interconnect said storage and said day disk and including a
Geneva wheel rigidly coupled to said day disk in coaxial relationship therewith, a pin for moving the
Geneva wheel, said pin set on the periphery of said driven disk of the storage, locking arcs of the Geneva wheel, closing on the side surface of said driven disk; and a lever lock of the date ring, cooperating with the toothed rim of the latter.
2. An instantaneous calendar device for timepieces as set forth in claim 1, wherein said Geneva wheel is rigidly coupled with the day disk for coaxial rotation therewith, the curvature of the locking surfaces of the Geneva wheel being greater than the curvature of the side surface of the driven disk of the storage.
3. An instantaneous calendar device for timepieces, as set forth in claim 1, wherein with projections of said Geneva wheel formed at the junctions of the locking surfaces thereof, there cooperates a thrust arm of said locking member of the date ring, said member presenting a free lever having a shape such that at the moment said arm is held at a projection of said Geneva wheel cross its locking portion is held between the teeth of the date ring, the length of said thrust arm being less than the distance from the center of rotation of the lever to the recess in the locking surface of the Geneva wheel.
4. An instantaneous calendar device for timepieces, as set forth in any one of the preceding claims and described in the specification with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7906859A GB2042225B (en) | 1979-02-27 | 1979-02-27 | Instantaneous calendar device for timepieces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7906859A GB2042225B (en) | 1979-02-27 | 1979-02-27 | Instantaneous calendar device for timepieces |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2042225A true GB2042225A (en) | 1980-09-17 |
| GB2042225B GB2042225B (en) | 1983-03-09 |
Family
ID=10503460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7906859A Expired GB2042225B (en) | 1979-02-27 | 1979-02-27 | Instantaneous calendar device for timepieces |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2042225B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4474920A1 (en) * | 2023-06-08 | 2024-12-11 | Manufacture d'Horlogerie Audemars Piguet SA | Timepiece mechanism comprising a jumping disc |
-
1979
- 1979-02-27 GB GB7906859A patent/GB2042225B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4474920A1 (en) * | 2023-06-08 | 2024-12-11 | Manufacture d'Horlogerie Audemars Piguet SA | Timepiece mechanism comprising a jumping disc |
| WO2024251693A1 (en) | 2023-06-08 | 2024-12-12 | Manufacture d’Horlogerie Audemars Piguet SA | Timepiece mechanism comprising a jumping disc |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2042225B (en) | 1983-03-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |