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
  • G04B19/25353—Driving or releasing mechanisms wherein the date indicators are driven or released mechanically by a clockwork movement driven or released stepwise by the clockwork movement
  • G04B19/2536—Driving or releasing mechanisms wherein the date indicators are driven or released mechanically by a clockwork movement driven or released stepwise by the clockwork movement automatically corrected at the end of months having less than 31 days

Definitions

• the present invention relates to a date mechanism comprising a date mobile equipped with a toothing of 31 teeth, a date display controlled by the date mobile, a driving mobile arranged to drive the date mobile and carrying a first finger and a second finger staggered angularly and vertically, the first finger being arranged to drive each day one step of the teeth of the date mobile, and further comprises a cam mounted months free to pivot concentrically to the mobile date and arranged to rotate a twelfth of a turn for each turn made by the date mobile, the date mobile bearing a rocker provided with at least one tooth, the rocker being arranged to occupy either an active position or an inactive position depending on the position angular of the cam months, said tooth of the rocker being arranged to be in the path of the second finger of the mob
• the trainer is set when the rocker is in the active position and the date display displays the "30".
• Patent document CH 685 585 describes an annual calendar mechanism that has all of the features listed above.
• this mechanism comprises a driving carrier which carries two fingers offset at the same time angularly and vertically and which are arranged to drive the date mobile.
• the first and the second fingers are not fixed rigidly to the driving mobile, but instead are integral with a disk which is itself freely fitted to the mobile coach.
• a pin is still attached to the mobile trainer to drive the rotating disk. With this feature, the first and second fingers are free to pivot forward away from the pin. The choice of this particular construction is motivated by considerations related to safety.
• the security system that has just been described, however, has certain disadvantages. For example, when the hands indicate a time that is early in the morning, and the wearer of the watch then manually steps back the hands until they indicate a time that is the night before, this change of the displayed time is not accompanied by a corresponding change in the date. Indeed, the security system prevents the fingers of the moving trainer to drive the date mobile back.
• One solution to this problem might be to do without the security system.
• this expedient does not solve all the problems.
• the annual calendar mechanism described in the aforementioned prior document has all the characteristics listed in the definition given in the preamble.
• its mobile date has a rocker arranged in an eccentric position.
• This rocker is provided with a single tooth.
• the rocker is arranged to occupy selectively one or the other of two positions, one for which the tooth of the rocker is in the path of the second finger of the mobile driver, so that the second finger can rotate one step the mobile date , and the other for which the tooth is outside the path of the second finger.
• the angular position of the cam of the months is such that the tooth of the rocker is in the path of the second finger of the driving mobile.
• the passage of the second finger has the effect of causing the latch and advance by one step the wheel set which thus passes from the position corresponding to the 30th day of the month corresponding to the 31 th. A few minutes or tens of minutes later, it is the first finger which, like every day, carries one of the 31 teeth of the date wheel, thus moving it from the position corresponding to the 31 st day of the month to the corresponding one. the 1st of the following month.
• the mobile date can not move back than a single step.
• the date display thus shows the 31 th day of the month, even when it is a month of 30 days.
• the second finger does not have the ability to drive back the tooth of the latch when the mobile date has the angular position corresponding to the 31 st day of the month.
• the tooth of the rocker is not on the path of the second finger when the date mobile is in the position corresponding to the 31 st day of the month.
• An object of the present invention is to overcome the disadvantages of the prior art which have just been explained.
• the present invention achieves this and other objects by providing a time setting device according to the appended claim 1.
• the rocker is provided with a forward drive tooth and a rear drive tooth, the two teeth of the rocker being contiguous so as to form a portion of teeth. , the tooth portion being concentric with the teeth of 31 teeth when the rocker occupies said one of the two positions, and the two teeth of the rocker being separated from each other by an angle equal to one step of the mobile date .
• Figure 1 is a partial plan view of an annual calendar mechanism corresponding to a particular embodiment of the invention, the partial view showing in particular the driving mobile and the date mobile;
• Figure 2 is a partial perspective view of the annual calendar mechanism of Figure 1, the perspective view showing the movable carrier in engagement with the date mobile;
• Figure 3 is a plan view of the annual calendar mechanism of Figures 1 and 2.
• FIG. 1 is a partial plan view of an annual calendar mechanism corresponding to a particular embodiment of the invention.
• the date mechanism is arranged in a timepiece so as to be driven by the movement of the timepiece.
• an hour wheel (referenced 1 1) forming part of the abovementioned clock movement (not shown) and a driving wheel 13 which, in the present example, is arranged to be driven from the hour wheel 1 1 through a gear (not shown) ratio 1/2.
• the driving mobile 13 carries a first finger 15 and a second finger 17 which are rigidly fixed to the mobile 13 in angularly and vertically offset positions.
• Each turn of the driving mobile 13, the first finger 15 advances a step of a date wheel 19 which is provided to complete a complete turn in thirty-one steps.
• Figure 1 also shows a cam of months 25 which is mounted freely to pivot concentrically to the date wheel.
• the cam profile for months 25 has an alternation of troughs and levees, and as will be seen in more detail later, the troughs correspond to the months of 31 days and the troughs correspond to the month of less than 31 days.
• a rocker 27 is pivotally mounted on the board of the date wheel 19.
• the latch 27 has two teeth 29, 31 which are contiguous and together form a tooth portion. It can be observed that, in the illustrated example, the spacing between the teeth 29 and 31 is substantially the same as the spacing between the teeth of the toothing 21 of the date wheel.
• a motive of the months which includes a star of the months 33 equipped with twelve teeth and a return 35 fixed rigidly in the coaxial position on the star months.
• the return 35 is provided with a toothing which meshes with the toothing of a wheel of the months 37 which is integral and coaxial with the cam of the months 25.
• the drive wheel completes a complete revolution while the hour wheel accomplishes two.
• the driving wheel is arranged to be driven by the movement of the timepiece at the rate of a turn in 24 hours.
• the timepiece is also equipped with a time setting for manually controlling the position of the minute hands and hours from outside the timepiece.
• the time setting is engaged with the timer train, so that it actuates respectively the two needles via the roadway and the hour wheel 1 1.
• the mobile of drive 13 is kinematically connected to the hour wheel, it will be understood that setting the time of the timepiece also controls the drive wheel and the date mechanism as a whole.
• the date wheel 19 is provided with a toothing having thirty-one teeth 21, and the first finger 15 is arranged to advance one step of one of the teeth 21 of the toothing each turn of the mobile drive 13.
• the rocker 27 is provided with a portion of teeth formed of two teeth 29 and 31.
• the rocker 27 also comprises a cam follower 32 which is permanently biased against the cam 25.
• the cam follower moves from a depression to a lifting of the cam, or vice versa, so that the rocker is caused to pivot between the one and the other two extreme positions depending on whether the Current month counts 30 or 31 days.
• the tooth portion formed by the two teeth 29, 31 is, in the active position, superimposed on the toothing of the date wheel 19, while when the follower cam is in a recess of the cam, the tooth portion is retracted.
• the two teeth 29 and 31 are respectively a forward drive tooth and a rear drive tooth.
• the forward drive tooth 29 is in the path of the second finger 17 of the driving wheel 13 when the date wheel 19 is in the position angular corresponding to the date 30, and the rear drive tooth 31 is on this path when the date wheel is in the angular position corresponding to the date 31.
• the second finger meets the one of the teeth 29 or 31, it pushes it in front of it so as to rotate the date wheel 19 by a step.
• the date wheel 19 further comprises a finger 23 arranged to cooperate with one of the twelve teeth of the star of the months 33 so as to take it one step each turn of the date wheel.
• the motive of the months and its star 33 are arranged to be driven by a twelfth of a turn for each complete turn made by the date wheel 19.
• the motive of the months also includes a reference 35 which is fixed rigidly in coaxial position on the star of the months.
• the gearing of the gear 35 meshes with the toothing of a wheel 37 months, itself integral and coaxial with the cam of months 25.
• the gear ratio is equal to 1 so that the wheel of 37 months and the cam 25 months are rotated at the same speed as the reference 35 and the star of the months 33.
• FIG. 3 is an overall plan view of the same annual calendar mechanism.
• the view of FIG. 3 shows in particular the date display which, in a manner known per se, comprises a ring 41 divided into 31 sectors each bearing the indication of one of the numbers from 1 to 31.
• the crown is arranged to turn step by step under the dial of the timepiece so that the numbers from 1 to 31 are successively visible through a window (not shown).
• the ring 41 still has an internal toothing 43 formed of 31 teeth.
• the step-by-step drive of the crown 41 is provided by a driving mobile of the display (referenced 45).
• the mobile driving of the display is itself actuated from the date wheel 19 via a gear wheel 47.
• the display also includes a disk of the months 51 divided into 12 sectors which each bear the indication of one of the twelve months of the year.
• the disc of months 51 is fixed rigidly on the mobile months so it is driven step-by-step with the star of the month 33. It will therefore be understood that the display of the month passes from the indication of one month to that of the following month each time the finger 23 of the date wheel 19 returns to advance one step of the teeth of the star of the month 33.
• flip-flop 27 is provided with a forward drive tooth 29 and a rearward drive tooth 31.
• the forward drive tooth 29 performs exactly the same function as the tooth of the rocker of the annual calendar mechanism of the prior art described above.
• the forward driving tooth 29 is in the path of the second finger 17 of the driving wheel 13.
• the forward and rearward drive teeth 29 are separated from each other by an angle equal to one step of the date wheel 19. Moreover, the rearward driving tooth 31 is arranged one step behind the forward driving tooth 29.
• the date wheel 19 occupies the angular position corresponding to the 31st day of the month so that the rear drive tooth 31 is on the trajectory the second finger 17.
• the second finger is attached to the drive, and it travels its circular path to the rhythm of a turn in 24 hours.
• the passage of the second finger 17 has the effect of advancing by one step the date wheel 19 which passes from the position corresponding to the 30th day of the month to that corresponding to the 31st.
• the driving wheel rotates a few degrees further, the passage of the first finger 15 will have the effect, as every day, to still lead one of the 31 teeth of the date mobile.
• the date mobile thus moves from the position corresponding to the 31st day of the month to that corresponding to the first day of the following month.
• the rearward drive tooth 31 has not been solicited. She was briefly on the path of the second finger 17, but as it passes only once a day, the rear drive tooth 31 did not have the opportunity to meet him before that the date mobile 19 still advances one step to the position corresponding to the first day of the month.
• the passage of the first finger 15 will have the effect of still one step back one of the 31 teeth of the mobile 19. It should be noted that during this retrograde process, the forward drive tooth 29 has not been solicited. It was in the path of the second finger 17 for almost a turn of the drive wheel 13, but as the latter rotates back, the passage of the first finger 15 takes place before the passage of the second 17, the tooth of rearward drive 31 therefore did not have the opportunity to meet the second finger 17 before the date wheel 19 again steps back to the position corresponding to the 29th day of the month.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Electromechanical Clocks (AREA)

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Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Cited By (1)

Families Citing this family (1)

Citations (3)

• 2018
  • 2018-04-04 EP EP18165750.3A patent/EP3550382A1/de not_active Withdrawn
• 2019
  • 2019-02-13 WO PCT/IB2019/051143 patent/WO2019193430A1/fr unknown
  • 2019-02-13 EP EP19708901.4A patent/EP3776095B1/de active Active

Patent Citations (4)

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