US3716983A - Calendar watch - Google Patents

Calendar watch Download PDF

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Publication number
US3716983A
US3716983A US00155433A US3716983DA US3716983A US 3716983 A US3716983 A US 3716983A US 00155433 A US00155433 A US 00155433A US 3716983D A US3716983D A US 3716983DA US 3716983 A US3716983 A US 3716983A
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Prior art keywords
month
date
calendar
dial
feed
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US00155433A
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English (en)
Inventor
K Tanaka
A Tsuzuki
T Matsumura
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Citizen Watch Co Ltd
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Citizen Watch Co Ltd
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    • 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

  • ABSTRACT This invention relates to the feed mechanism of the above kind, by which a plurality of calendar teeth are automatically fed at every end of small or even months, so as to obviate otherwise troublesome manual calendar feed operation to be carried out at such every month end above referred to.
  • the improvement resides in the provision of a small month end driver rotatably mounted on said date dial and adapted for performing a complete revolutionper month together therewith said driver being controlled in its position by saidcam and in close proximity of every month end.
  • This invention relates to improvements in and relating to the feed device for the calendar mechanism of a timepiece, especially watch. More specifically, it relates to the feed mechanism of the above kind, by which a plurality of calendar'teeth are automatically fed at every end of small or even months, so as to obviate otherwise troublesome manual calendar feed operation to be carried out at such every month end above referred to.
  • a representative one of the above improved mechanisms having a simplest design and structure comprises a specific wheel called date feed wheel which performs a complete revolution per 24 hours and so acts upon a lever pivotably mounted on the conventional plate of the timepiece movement, thereby said lever being driven for making a swivelling movement.
  • the pivotable lever has substantially large dimensions and requires a substantial space for performing its pivotal movement in combination with its related and cooperating mechanical parts. It is therefore highly difficult to use such conventional feed lever and its related parts in the smaller timepieces, especially watches which must be as small and thin as possible so as to meet with recent consumers demands.
  • this conventional date feed mechanism is designed so that torque is transmitted from the date feed wheel through the pivotable lever to the date calendar-dial only with an inferior transmission efficiency.
  • the dailyregular date calendar feed is performed with a return spring attached to said lever being substantially deformed, thereby imposing a substantial counter load upon the timepiece movement.
  • a further object is to provide the calendar feed mechanism of the above kind, capable of arranging its main working parts substantially on a plane and the whole structure is highly simplified and represents the smallest possible number of constituent parts.
  • a still further object is to provide a calendar dial feed mechanism as referred to above, capable of being combined with the regularly adopted ring-shaped date calendar dial and applicable to the wrist watch movement.
  • a further object is to provide the calendar dial feed mechanism of the above kind, capable of consuming very little energy for drive of the mechanism.
  • FIG. 1 is a plan view of a first embodiment of the invention, wherein, however, several parts thereof are shown only partially and the full lines and dotted lines represent the constituent parts in their position occupied at the end of a smaller month, while the chaindotted lines represent the position of the actuator at the end of a large or odd month.
  • FIG. 2 is a similar view of FIG. 1, illustrating a second embodiment of the invention.
  • FIG. 3 is a similar view to FIG. 2, illustrating the second embodiment again and more specifically showing the feeding mode of the month dial.
  • FIG. 4 is a similar view to FIG. 1, illustrative, however, of a third embodiment of the invention in its relative position at the end of a smaller month.
  • FIG. 5 is a similar view to FIG. 1, illustrative of a fourth embodiment of the invention and showing the relative position of constituent parts at the end of a small or even month with exception of February.
  • FIG. 6 is a similar view to FIG. 5, illustrative of the fourth embodiment again and showing the relative position of the main working parts at the end of a large or odd month.
  • the numeral I represents partially a conventional plate of a watch movement, said plate being shown in a highly simplified way several recesses and openings for attachment of several working parts not belonging to the inventive mechanism have been omitted for simplicity.
  • the reference numeral 2 represents a conventional month star wheel having twelve separate radial projections or teeth 2a and rotatably mounted on the plate 1 by means of a stud 1a.
  • a month discriminating cam 3 is concentrically and fixedly mounted on the month star wheel 2, so as to perform a unitary rotation therewith.
  • This cam 3 is a substantially circular disc'formed on its peripheral surface alternately with low and high cam edges 3a and 3b corresponding to the respective large or odd months which consist of January, March, May, July, August, October and December, and to the respective smaller months which consist of February, April, June, September and November.
  • numerals 1-12 radially arranged in radial registration of said projections or teeth 2a and in correspondence to the calendar months from January to December, respectively.
  • Star wheel 2 and discriminator cam 3 are made integral with each other by press fit, soldering, welding, bulging and hammering or riveting or the like conventional fixing procedure, so as to form, in combination, a month calendar dial 4 which is pivotably mounted on said plate 1 by means of stud 1a, as was described in the foregoing.
  • a jumper spring 5 only partially shown, has its root portion, not shown, fixedly mounted on the plate 1, the
  • This dial ring 6 is formed inside peripheral teeth 6a corresponding to respective date calendar symbols 1-31.
  • the dial ring 6 is provided fixedly with a month feed pin 6b and subjected to a spring pressure exerted by a jumper similar to that shown at 5, although not shown. This jumper is also fixedly attached at its root end on the plate 1 as before.
  • Numeral 7 represents a date feed member, preferably formed into a pawl which is mounted fixedly on a date feed wheel 8 which wheel is driven, as conventionally from the conventional time-keeping and time-indicating gear train, not shown, of the watch movement and performs a complete revolution per 24 hours, said pawl 7 and said wheel 8 being rotatably mounted on the plate 1 by a common stud 1b.
  • Month feed pin 6b is so designed and arranged that it engages with the teeth 2a on month star wheel 2 for performing one step feed thereof when the date dial 6 is fed from its 31st day display position of a certain large month to its 1st day display one of the next following month.
  • a small month end feed lever 9 is pivotably mounted at 6c on the rear surface of date dial 6, said lever having an end pawl 9a adapted for engagement with said date feed pawl 7.
  • the feed lever 9 is further formed with a projection 9b in proximity to the opposite end to said end pawl 9a, said projection 9b being adapted for engagement with month discriminator cam 3 and said opposite end being formed into an elongated spring 9c which is kept in pressure contact with month feed pin 6b.
  • lever 9 With pressure contact of end spring with month feed pin 6b, the lever 9 is resiliently urged to rotate counter-clockwise in FIG. 1, but this rotation is limited by contact with a circular and concentric shoulder 6d formed on the dial 6. This extremely rotated position of lever 9 is shown by chain-dotted line in FIG. 1.
  • the conventional time-indicating dial is a dial
  • the date feed pawl 7 which rotates a complete revolution per 24 hours in unison with date feed wheel 8 only schematically represented will drive the date dial 6 one tooth pitch per day (24 hours) by engagement with one of the teeth 6a, as conventionally by receiving motion from the regular time-keeping and time-indicating gear train of the watch movement, not shown, so as to display a proper and different date symbol per day through window 10.
  • the date symbol 30" becomes visible through date display window 10
  • smallmonth-end feed lever 9 is brought into engagement by its projection 9b with one of the peripheral parts on month discriminator cam 3.
  • month feed pin 6b will feed the month star wheel by a tooth pitch in the direction as shown by an arrow 8" shown in FIG. 1, thus the month display symbol appearing at the month-viewing window 11 being altered correspondingly to show the new calendar month.
  • the calendar must be manually adjusted at each end of February, regardless of the year being leap or regular one.
  • numeral 101 represents a plate as at l in the foregoing and 102 shows a month star wheel which corresponds that shown at 2 in the foregoing.
  • numeral 103 represents a month discriminator cam as at 3 in the foregoing.
  • This cam 103 is formed alternatively again low and high peripheral parts 103a and 103b and carries thereon twelve month symbol representations 1-12 covering a year round.
  • Month star wheel 102 and month discriminator cam 103 are rigidly united together as before, so as to provide a month calendar dial 104 which is rotatably mounted on a conventional cannon wheel 150 constituting a member of the conventional time-keeping and time-indicating gear train, not shown, of the watch movement.
  • Jumper spring 105 is also provided which is similar in its design and operation to that shown at 5 in the foregoing.
  • Date dial 106 corresponds to that shown at 6 in the foregoing.
  • This date dial carries thereon a series of date display symbols 1-31 covering a large or odd month as before, although not shown only for simplicity.
  • Inside date feed teeth 106a corresponding to said date symbols 1-31 are also formed on the inside periphery of the date dial again as before.
  • This dial 106 has a stepped cross-section as shown by numeral 106g.
  • Pins 1060, 106e and 106f and an opening 106d are provided on and in the date dial 106 as seen, the latter being naturally rotatably mounted on the plate 101, although its bearing means for this purpose has been omitted from the drawing for simplicity.
  • This date dial is also kept in fed position by contact with a further jumper spring, although not shown.
  • Numeral 107 represents a date feed member as at 7 in the foregoing and preferably formed again into a feed pawl.
  • This feed pawl 7 is fixedly mounted on the date feed wheel 108 which is similar in its structure and operation to that shown at 8 in the foregoing.
  • This wheel 108 performs a complete revolution per 24 hours and adapted for daily feed of date dial 106 in the direction of an arrow D.
  • Date feed wheel 108 and date feed 107 rigid therewith are commonly mounted rotatably around a pin 101a.
  • Numeral 109 represents a small month end feed lever and rotatably mounted as before by means of a stud pin 106b on the rear surface of the dial 106 and having a thickened pawl end 109a which is adapted for engagement with said date feed pawl 107.
  • the feed lever 109 is formed at the opposite end by press job with a projection 10% which is adapted for engagement with a month discriminator lever 121 to be described, at the end of the month.
  • a wire spring having its one end kept in fixed position by engagement with opening 106d and kept by its intermediate part in pressure engagement with pin 106a.
  • the wire spring 120 has its opposite or free end kept in pressure engagement with the small month end feed lever 109 so that the latter is always urged resiliently to turn in counter clockwise direction in FIGS. 2 and 3 and finally and normally kept in pressure engagement with stud pin 106e.
  • Numeral 121 represents a month discriminator lever which is rotatably mounted on the plate 101 around a pin 101b studded thereon. One end 121a of this lever 121 is kept in pressure engagement with discriminator cam 103, while the opposite end 1211) of said lever 121 is ready for engagement with the projection 10% on lever 109 at the end of the month.
  • the lever end 121a is brought into engagement with one of high peripheral parts 103b of cam 103, as shown in full line in FIG. 2 and the other lever end 121b is brought into engagement with the projection 109b, so as to urge the lever 109 to turn in the clockwise direction and against the action of wire spring 120 until it is brought into and kept in pressure engagement with stop pin 106f.
  • the pawl end 1090 of said feed lever 109 protrudes beyond an imaginary circle connecting the addendum ends of date dial teeth 106a towards the center of the watch movement, not shown, said center coinciding the rotational center of the date dial 106.
  • the lever end 121a is kept in engagement with one of the low peripheral parts 103a of month discriminator cam 103, while the opposite lever end 12,1b is thus unengageable with the projection 10% and the end pawl 109a of feed lever 109 does not protrude beyond said imaginary tooth end circle of date dial 106.
  • Numeral 122 represents a month feed lever which is formed at its central zone with an elongated slot 122a in which a studded pin 1010 on the plate 101 is slidably and pivotably received, said lever 122 being provided at its one end with a pawl 122b adapted for feed of the star wheel 102 when engaged therewith, and at its opposite end with a tail part 122c adapted for engagement with the pawl end 109a of small month end feed lever 109.
  • a wire spring 123 is fixedly mounted at its root end, not shown, on the plate 101, while the free end of said spring 123 is kept in pressure contact with a stop pin 122d mounted fixedly on month feed lever 122 which is thus resiliently urged to move leftwards and to swivel counter-clockwise in FIG. 2.
  • the lever122 is normally kept in pressure contact with a stop pin 101d fixedly mounted on the plate 101, thereby its pawl end 12% being kept in separation from contact with month star wheel 102 as shown in FIG. 2.
  • a stationary guide pin l01e is studded on the plate in proximity to the lever 122, so as to guide the movement thereof by contact with the outer convexedly curved edge of said lever 122.
  • the date calendar dial 106 is fed by a step corresponding to 24 hours per day under the action of date feed pawl 107, as in the similar way to the case of the first embodiment.
  • the end 121a of month discriminator lever 121 is brought into engagement with one of the high peripheral parts 103b on the month discriminator cam 103.
  • the date dial 106 is rotated until the projection on small month end feed lever 109 is brought into engagement with the opposite end 121b of lever 121 and when the date symbol 30 appears through the date symbol display window, not shown, which can be made as at 10 in FIG. 1, the lever 109 is driven to swivel clockwise in FIG. 2 and the pawl end 109a will protrude as shown therein in full line.
  • date feed pawl 107 will be brought into engagement with the thus protruded end pawl 109a and thus, the date dial 106 will be fed by 'a tooth pitch, so as to show the next calandar date symbol 3 1 through the display window.
  • the date dial 106 is headed from a slightly displaced position, as commonly known by the action of the related jumper spring, not shown.
  • the lever 109 is receded from contact with lever 121 and returns to the most counter-clockwise truned position as shown in chain-dotted line in FIG. 2.
  • date feed pawl 107 With further rotation of date feed pawl 107 in the direction shown by arrow E," it feeds the date dial as usual by a further tooth pitch, thus the following date display symbol l which represents the first date of the next following month, will become visible through the date display window.
  • month feed lever 122 will return to its position shown in Fib. 2 under the influence of spring force at 123.
  • a reverse rotation of month star wheel 102 is positively prevented, upon returning with the sliding contact of lever 122 with the guide pin 101d.
  • the discriminator lever 121 is kept in engagement with one of low peripheral part 103a of said cam 103 and small month end feed lever 109 will maintain its most counter-clockwise turned position even at arrival of 30th day of the month, as shown in chain-dotted line in FIG. 2, thus the date calendar dial 106 will be fed as usually by a tooth pitch per day.
  • month star wheel 102 At arrival of the 31st day of the month, month star wheel 102 will be fed a tooth as in the case of a small month as above referred to.
  • month discriminator 121 and month feed lever 122 as in the case of the present second embodiment, a certain design condition in the relative position between date calendar dial and month calendar dial can be substantially obviated, thus the design and structure of the related parts of the watch movement has a substantially broad freedom.
  • 201 represents the plate of the watch movement; 202 a month star wheel; 203 a month discriminator cam, said cam formed alternatively with low peripheral part 203a and high peripheral part 2013b.
  • Month star wheel 202 and cam 203 are mutually fixed to each other, so as to provide in combination a month calendar dial 204 which is pivotably mounted on the plate 201 by means of a common stud 201a.
  • Numeral 205 represents a month jumper spring as at 5 in the foregoing first embodiment; 206 a date calendar dial, having thirty one teeth 206a.
  • the dial 206 comprises the thus formed gear portion 206b and represents thereon the corresponding 3 1 date calendar symbols on its plate portion 206c, although these date symbols have been omitted from the drawing for simplicity.
  • a month feed pawl 206d adapted for engagement with said month star wheel 202 is fixedly and rigidly mounted on the dial 206.
  • a stud 201k is rigidly mounted on the plate 201 and serves for rotatable mounting of said dial 206.
  • a jumper spring or lever 224 is fixedly mounted at its root end as usual on the plate 201.
  • Numeral 207 represents a date feed pawl corresponding to that shown at 7 in the first embodiment, said pawl 207 being fixedly mounted on a date feed wheel 208 formed and mounted in the similar way as at 8 in the first embodiment.
  • This wheel 208 is rotatably mounted as before on the plate 201 by means of a stud 201C.
  • Numeral 209 represents a small month end feed member, preferably formed into a feed pawl as shown, as at 9 in the first embodiment, said feed pawl 209 is provided between the date symbol display part 206c and the gear part 206b and mounted on the latter.
  • the gear part 206b is provided thereon with three separate pins 206e, 206) and 206g.
  • the pawl 209 is formed with an elongated slot 209a and a peripheral recess 20% as shown for respective engagement with said pins 206e and 206f, thereby said pawl 209 being slidable in the radial direction relative to said gear part 206b.
  • said pawl 209 is formed further with a pawl proper 209c kept in a constantly over-lapping way with a tooth 206a formed on said gear part 206b and corresponding to the 30th calendar daily display.
  • a projection 209d is formed by pressing job on the pawl 209, said projection 209d being adapted for engagement with a month discriminator lever 221 to be described.
  • Numeral 220 represents a curved wire spring, one end of which is fixedly mounted by means of a pin 206g fixedly mounted on date dial 206, while its free end is kept in pressure engagement with said pawl 209, thus exerting a radially and outwardly directing resilient pressure relative to said gear part 206b upon said pawl 209.
  • the dial 206 comprises the thus formed gear portion 206b and represents thereon the corresponding thirty one dates calendar symbols on its plate portion 206e, although these date symbols have been omitted from the drawing for simplicity.
  • a month feed pawl 206b adapted for engagement with said month star wheel 202 is fixedly and rigidly mounted on the dial 206.
  • Numeral 221 represents a month discriminator lever which is pivotably mounted on the plate 201 by means of a studded pin 201d.
  • One end 221a of said lever 221 is kept in pressure engagement with discriminator cam 203 under the influence of spring 225 only partially shown, while the opposite end 221! is adapted for engagement with a projection 209d on the feed pawl 209.
  • date feed pawl 207 will act as usual to feed the gear part 206b by one step per 24 hours in the direction of an arrow G.
  • month discriminator lever 221 is kept in engagement with one of low peripheral parts 203a of cam 203, the lever 221 can not engage the projection 209d on feed pawl 209 even at the 30th day of the month.
  • the pawl 209 keeps its outermost peripheral position relative to the gear part 206b and its pawl proper 209c protrudes a small distance from the tip end of a specifically selected tooth on gear part 206b and corresponding to the 30th calendar date of the month.
  • date feed pawl 207 is brought into engagement with said pawl proper 209a so as to feed the date dial by two successive date steps for display of 1 corresponding the first date of the next following calendar month.
  • month feed pawl 206d will feed month star wheel 202 by a month step in the direction of arrow H," so as to display the next following month display.
  • discriminator lever 221 is kept in engagement with one of high peripheral parts 2031:.
  • small month end feed pawl 209 will receive pressure force through its projection 209d by engagement with lever end 221b, thus pawl proper 2090 being receded from its foregoing protruding position.
  • date feed pawl 207 is brought into engagement with a specific tooth 206a corresponding to the 30th date display symbol, so as to feed the gear part 206b by one tooth until the next following date display symbol or 31st calendar date will become visible through the related display window.
  • month star wheel 202 is fed just a tooth pitch, so as to display the next following calendar month.
  • a modification from the foregoing second and third embodiments may be such that the specific peripheral part on the discriminator cam 103 or 203, corresponding to calendar February, represents a higher peripheral part than those for other small or even months, so as to provide an automatic calendar date dial feed at the end of February of the year being of leap or of regular one.
  • the month discriminator can be formed with a group of cam steps corresponding to four successive years in a proper way, as easily occur to any person skilled in the art from the foregoing description of the discriminator cam, for obviating manual calendar adjustments at all, otherwise to be carried out at every month end.
  • reference numeral 310 represents a conventional plate; and reference numeral 303 denotes a month discriminator cam concurrently serving as month star wheel denoted at 2; 102 and 202 in the foregoing.
  • This cam 303 carries thereon twelve successive month display representations covering a year round, although not shown for simplicity.
  • the cam 303 is formed on its periphery, twelve teeth 303a in radial registration of these month calendar displays.
  • the tooth bottoms are of different heights as at 30%; 3030 and 303d.
  • the shallowest tooth bottoms 303b correspond to large or odd months, respectively.
  • Middle height tooth bottoms 3030 correspond to small or even months, respectively.
  • the sole deepest tooth bottom 303d corresponds to the regular Februa
  • This cam 303 is united concentrically with a month display disc 304a, carrying successive twelve months of the year, so as to provide, in combination, a month calendar display dial at 304, although not specifically shown for simplicity.
  • the month dial, briefly, at 304 is rotatably and concentrically mounted on the conventional cannon wheel 350, as in the foregoing several embodiments.
  • Numeral 306 represents, only partially, a date calendar display dial as at 6 and 206 in the foregoing, and as shown in chain-dotted line in FIG. 5, said dial being rotatably mounted on as usual the plate 301.
  • the date dial 306 carries thereon 'thirty one successive date display symbols 1-31 covering a large or odd month, although not shown.
  • This dial 306 is formedwith thirty one teeth 306a in radial registration of these date display symbols, respectively, although not shown for simplicity.
  • a projection 3061) is formed on a specifically selected tooth as shown.
  • Date feed pawl 307 and a small month end feed wheel 307a constitute in combination a date feed member is fixedly mounted on the date feed wheel 308.
  • Date feed wheel 308 is rotatably mounted on the plate 301 by means of a studded pin 301a, the rotational direction being shown by an arrow I.
  • the feed wheel 308 performs a complete revolution per 24 hours as be fore.
  • Numeral 309 represents a small month end feed member, preferably formed into a lever as shown, which is pivotably mounted on date dial 306 by means of a studded pin 3060.
  • This feed lever 309 is formed with a guide portion 309a; cam portion 30% and rack teeth portion 3090.
  • Main month discriminator lever 321 and auxiliary month discriminator lever 324 are pivotably mounted on the plate 301 by means of respective stud pins 301!) and 3011:.
  • Main discriminator lever 321 has its one end 321a adapted for engagement any one of tooth bottoms 303b; 303c and 303d on the cam 303, while the opposite lever end 321b is adapted for engagement with one end 324a of auxiliary discriminator lever 324.
  • the auxiliary lever 324 is formed at its opposite end with a holder part 324b adapted for provisional holding of said cam portion 30% on lever 309 at the middle of each calendar month.
  • On the holder part 324b there are formed two projections 324b' and 32412" for determination of the relative position between the teeth portion 3090 and small month end feed wheel 307a.
  • auxiliary lever 324 One end 324a of said auxiliary lever 324 is kept in pressure contact with a wire spring 325, only partially shown, thereby the levers 324 and 321 being urged resiliently to rotate clockwise and counterclockwise in FIG. 5, respectively. Therefore, it will be seen that the lever 321 may act as a jumper spring relative to the discriminator cam 303.
  • Month feed lever 322 is pivotably mounted on the plate 301 by means of a pivot pin 301d, the pawl end 322a of said lever 322 being positioned opposite the month discriminator cam 303 and the opposite lever end 322b being provided within the moving passage zone of the projection 306b on the date calendar dial 306.
  • a partially shown wire spring 323 is kept in pressure contact with a pin 3220 on month feed lever 322, the latter being held at its regular or stationary position shown in FIG. 5.
  • date calendar dial 306 is fed daily only by the cooperation with date feed pawl 307 in the direction shown by an arrow J.”
  • Lever end 321a is in this case kept is engagement with one of shallow tooth bottoms 303b and thus, month discriminator main lever 321 and auxiliary lever 324 are kept in their respective most clockwise turned and most counterclockwise turned position shown.
  • the guide portion 309a of small month end feed lever 309 which is mounted on date calendar dial 306 and brought to a proper position by rotation thereof, is brought to the position defined between two projections 324b' and 324b" for initiation of guided movement.
  • auxiliary lever 324 Since the auxiliary lever 324 is positioned at its most counter-clockwise turned position, the toothed portion 3090 of said lever can not be brought into meshing relationship with the teeth of small monthend feed wheel 3070 during the period covering 27th 30th calendar day; and at 31st day, it will occupy the position shown in FIG. 6.
  • date feed pawl 307 will feed the date calendar dial 306 just a tooth pitch at the end of 31st calendar day, and concurrently, the projection 306b on dial 306 will become engaged with the projection 322b of month feed lever 322, thereby the latter being turned clockwise and its pawl portion 322a acting upon the tooth 303a on cam 303 to feed it just a tooth pitch in the direction shown by an arrow I(.”
  • spring 323 will become effective to return month feed lever 322 back to its original position.
  • date calendar dial 306 will be daily fed as usual during the period from the first to the 30th day of the month, by the action of date feed pawl 307.
  • the cam portion 30% of lever 309 will be caught between two projections 324b' and 32411" on auxiliary lever 324.
  • month discriminator lever 321 is kept in engagement with one of middle height tooth bottoms 3030, thus being positioned its more counter-clockwise turned position.
  • the auxiliary lever 324 occupies in this case a clockwise turned position from that corresponding to the large or odd month.
  • small month end feed lever 309 will occupy a counter-clockwise turned position from that corresponding to the large month shown in FIG. 6, wherein toothed portion 309c has been brought into engagement with the tooth of the feed wheel 3070 as shown in FIG. 5, thereby the date dial 306 being fed just a further tooth pitch.
  • cam 303 is fed just a tooth pitch as in the case of a large month.
  • next month and date calendar displays corresponding to the first date of June will become visible through respective display windows.
  • the date dial 306 will be fed daily and regularly until arrival of the 28th calendar date.
  • month discriminator lever 321 is kept in engagement with the deepest tooth bottom on lever 303 and thus, it is positioned at a still further counterclockwise turned position from that shown in FIG. 5.
  • date feed pawl 307 feeds the date dial 306 just a tooth pitch and the toothed portion 309c initiates to engage the small month end feed wheel 3070.
  • the month discriminator cam 303 may be, if necessary, divided into two elements as at 3; 103 and 203 and 2', 102 and 202 appearing in the foregoing first to third embodiment.
  • the month discriminator cam, month star wheel and the like relations constituting the month calendar dial may be designed so as to cover 48 consecutive months, when necessary, although not shown.
  • the month discriminator cam may be formed with four different kinds of peripheral parts having mutually different heights, so as to correspond to large or odd months, small or even months, regular February and leap February, correspondingly.
  • the month discriminator cam 103 or 203 may be modified in such'that the specific peripheral part corresponding to February has a still larger height than those of the peripheral parts corresponding to regular small or even months, in order to provide an automatic month end calendar feed at the regular or leap February, as may easily occur to any skilled person in the art upon review of the foregoing description of the invention.
  • month star wheel or month discriminator cam may carry every month calendar display symbol thereon
  • a separate month calendar display dial or the like member may be provided in cooperation with them.
  • a conventionally known quick acting feed means may be added to the date feed wheel and within the time range for feeding the date dial, in any of the foregoing embodiments.
  • the date feed pawl may be divided into two elements one of which does not engage the date dial in the regular days, yet capable of engaging the small month end feeder at every small month ends for feeding the date dial, while the other of which is adapted for performing the daily regular feed of the date dial once per complete day and in a quick-acting way, in order to shorten the calendar change operation periods.
  • the date feed pawl and the small month end feed wheel in the fourth embodiment may be, when necessary, mounted on respective separate pivot pins.
  • a calendar watch comprising a plate, a date calendar dial ring mounted on said plate and having thirty one successive date calendar display symbols and thirty one correspondingly arranged teeth, a month calendar dial ring rotatably mounted on said plate and comprising a month discriminator cam having at least twelve successive month calendar display symbols, said month calendar dial ring adapted to rotate a month step for a complete revolution of said date dial ring, said discriminator cam having different peripheral parts having different radial heights depending on the length of the calendar months, date feed means operatively connected with a conventional time-keeping and time indicating gear train engaging and advancing said date calendar dial a single tooth daily, a small month driver member pivotally mounted on said date dial and adapted to perform a complete revolution per month together therewith, and follower means operatively interposed between said driver and said cam for shifting said driver into operative engagement with said feed means at the end of the month for advancing said date calendar dial at least two teeth.
  • a calendar watch as set forth in claim 1 wherein said date feed means is comprises of a date feed pawl rotatable through a comple e revolution per day for feeding said date dial ring by a single tooth and a small month end feed wheel rotatable with said pawl, said small month drive member having tooth means thereon for engagement with said wheel.
  • a calendar watch as set forth in claim 1 further comprising a month feed member mounted on said plate and disposed for operative engagement with said date dial ring and said month dial ring for advancing said month dial ring and said discriminator cam upon rotation of said date dial ring at the end of a month.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
US00155433A 1970-06-22 1971-06-22 Calendar watch Expired - Lifetime US3716983A (en)

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JP45054199A JPS515594B1 (enrdf_load_stackoverflow) 1970-06-22 1970-06-22

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US3716983A true US3716983A (en) 1973-02-20

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US00155433A Expired - Lifetime US3716983A (en) 1970-06-22 1971-06-22 Calendar watch

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US (1) US3716983A (enrdf_load_stackoverflow)
JP (1) JPS515594B1 (enrdf_load_stackoverflow)
DE (1) DE2131532A1 (enrdf_load_stackoverflow)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3827234A (en) * 1972-08-03 1974-08-06 K Imanishi Display device for calendar watch
US3841084A (en) * 1972-04-05 1974-10-15 Suisse Horlogerie Calendar mechanism for time-pieces
US4182109A (en) * 1977-08-22 1980-01-08 Citizen Watch Co., Ltd. Calendar mechanism for timepieces
US4234943A (en) * 1977-11-26 1980-11-18 Citizen Watch Co., Ltd. Month correcting mechanism for calendar timepieces
US4266289A (en) * 1977-11-30 1981-05-05 Kabushiki Kaisha Daini Seikosha Calendar correcting mechanism
US4276628A (en) * 1977-07-26 1981-06-30 Citizen Watch Company Limited Electronic timepiece
EP0987609A1 (fr) * 1998-09-14 2000-03-22 Frédéric Piguet S.A. Mécanisme de quantième annuel pour mouvement d'horlogerie
US6108278A (en) * 1998-09-11 2000-08-22 Frederic Piguet S.A. Annual calendar mechanism for clockwork movement
US6118734A (en) * 1997-01-30 2000-09-12 Girard-Perregaux, S.A. Train of clockwork with perpetual Julian date
US6295250B1 (en) * 1997-03-27 2001-09-25 Girard-Perregaux S.A. Time-setting mechanism for clock movement with perpetual julian date
US20050056691A1 (en) * 2003-09-11 2005-03-17 Kilian Eisenegger Device for date indication
US20070195649A1 (en) * 2003-08-12 2007-08-23 Frederic Crettex Calendar Corrector
US20090129207A1 (en) * 2007-11-21 2009-05-21 Mamoru Watanabe Calendar mechanism-attached timepiece having month indicator and date indicator
US20120213037A1 (en) * 2011-02-17 2012-08-23 Glashuetter Uhrenbetrieb Gmbh Program wheel of a calendar mechanism
CN102819213A (zh) * 2011-06-10 2012-12-12 精工电子有限公司 日历机构和具有该日历机构的钟表
US20130170325A1 (en) * 2011-12-01 2013-07-04 Seiko Instruments Inc. Calendar mechanism and timepiece having the same
US9477204B2 (en) * 2014-12-29 2016-10-25 Montres Breguet S.A. True perpetual calendar device
CH711049A1 (de) * 2015-05-08 2016-11-15 Bucherer Ag Jahreskalender für mechanische Uhren.
EP3567438A1 (fr) 2018-05-09 2019-11-13 Rolex Sa Systeme de calendrier horloger
EP4187327A1 (fr) * 2021-11-30 2023-05-31 Rolex Sa Système de calendrier horloger
EP4187329A1 (fr) * 2021-11-30 2023-05-31 Rolex Sa Système de transmission de mouvement pour calendrier horloger
EP4187328A1 (fr) * 2021-11-30 2023-05-31 Rolex Sa Système de calendrier horloger

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH710229A2 (fr) * 2014-10-13 2016-04-15 Montres Breguet Sa Quantième perpétuel à différentiel.

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US203640A (en) * 1876-10-12 1878-05-14 Improvement in calendar-watches
US563268A (en) * 1893-03-06 1896-07-07 Perpetual calendar for watches or clocks
US2286000A (en) * 1940-11-01 1942-06-09 Warren Telechron Co Calendar clock
US2483775A (en) * 1947-02-27 1949-10-04 Lodewyk Den Hartog Mechanical calendar
US2709885A (en) * 1951-12-28 1955-06-07 Marinus T Van Kampen Calendar mechanism
US3373558A (en) * 1965-08-30 1968-03-19 Makiri Uria Calendar clock or watch
FR1575397A (enrdf_load_stackoverflow) * 1967-07-26 1969-07-18

Patent Citations (7)

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Publication number Priority date Publication date Assignee Title
US203640A (en) * 1876-10-12 1878-05-14 Improvement in calendar-watches
US563268A (en) * 1893-03-06 1896-07-07 Perpetual calendar for watches or clocks
US2286000A (en) * 1940-11-01 1942-06-09 Warren Telechron Co Calendar clock
US2483775A (en) * 1947-02-27 1949-10-04 Lodewyk Den Hartog Mechanical calendar
US2709885A (en) * 1951-12-28 1955-06-07 Marinus T Van Kampen Calendar mechanism
US3373558A (en) * 1965-08-30 1968-03-19 Makiri Uria Calendar clock or watch
FR1575397A (enrdf_load_stackoverflow) * 1967-07-26 1969-07-18

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3841084A (en) * 1972-04-05 1974-10-15 Suisse Horlogerie Calendar mechanism for time-pieces
US3827234A (en) * 1972-08-03 1974-08-06 K Imanishi Display device for calendar watch
US4276628A (en) * 1977-07-26 1981-06-30 Citizen Watch Company Limited Electronic timepiece
US4182109A (en) * 1977-08-22 1980-01-08 Citizen Watch Co., Ltd. Calendar mechanism for timepieces
US4234943A (en) * 1977-11-26 1980-11-18 Citizen Watch Co., Ltd. Month correcting mechanism for calendar timepieces
US4266289A (en) * 1977-11-30 1981-05-05 Kabushiki Kaisha Daini Seikosha Calendar correcting mechanism
US6118734A (en) * 1997-01-30 2000-09-12 Girard-Perregaux, S.A. Train of clockwork with perpetual Julian date
US6295250B1 (en) * 1997-03-27 2001-09-25 Girard-Perregaux S.A. Time-setting mechanism for clock movement with perpetual julian date
US6108278A (en) * 1998-09-11 2000-08-22 Frederic Piguet S.A. Annual calendar mechanism for clockwork movement
EP0987609A1 (fr) * 1998-09-14 2000-03-22 Frédéric Piguet S.A. Mécanisme de quantième annuel pour mouvement d'horlogerie
CN100589047C (zh) * 2003-08-12 2010-02-10 弗勒里耶沃谢制造股份有限公司 日历校正器
US20070195649A1 (en) * 2003-08-12 2007-08-23 Frederic Crettex Calendar Corrector
US7333397B2 (en) * 2003-08-12 2008-02-19 Vaucher Manufacture Fleurier S.A. Calendar corrector
US20050056691A1 (en) * 2003-09-11 2005-03-17 Kilian Eisenegger Device for date indication
US7266050B2 (en) * 2003-09-11 2007-09-04 Richemont International Sa Device for date indication
US8059492B2 (en) * 2007-11-21 2011-11-15 Seiko Instruments Inc. Calendar mechanism-attached timepiece having month indicator and date indicator
US20090129207A1 (en) * 2007-11-21 2009-05-21 Mamoru Watanabe Calendar mechanism-attached timepiece having month indicator and date indicator
US8811125B2 (en) * 2011-02-17 2014-08-19 Glashuetter Uhrenbetrieb Gmbh Program wheel of a calendar mechanism
US20120213037A1 (en) * 2011-02-17 2012-08-23 Glashuetter Uhrenbetrieb Gmbh Program wheel of a calendar mechanism
US8861313B2 (en) * 2011-06-10 2014-10-14 Seiko Instruments Inc. Calendar mechanism and timepiece having the same
JP2012255752A (ja) * 2011-06-10 2012-12-27 Seiko Instruments Inc カレンダ機構及びこれを有する時計
US20120314544A1 (en) * 2011-06-10 2012-12-13 Shigeo Suzuki Calendar mechanism and timepiece having the same
CN102819213A (zh) * 2011-06-10 2012-12-12 精工电子有限公司 日历机构和具有该日历机构的钟表
CN102819213B (zh) * 2011-06-10 2016-06-15 精工电子有限公司 日历机构和具有该日历机构的钟表
US20130170325A1 (en) * 2011-12-01 2013-07-04 Seiko Instruments Inc. Calendar mechanism and timepiece having the same
US8848489B2 (en) * 2011-12-01 2014-09-30 Seiko Instruments Inc. Calendar mechanism and timepiece having the same
US9477204B2 (en) * 2014-12-29 2016-10-25 Montres Breguet S.A. True perpetual calendar device
CH711049A1 (de) * 2015-05-08 2016-11-15 Bucherer Ag Jahreskalender für mechanische Uhren.
WO2016179714A1 (de) * 2015-05-08 2016-11-17 Bucherer Ag Jahreskalender für mechanische uhren
US10317844B2 (en) 2015-05-08 2019-06-11 Bucherer Ag Annual calendar for mechanical watches
EP3567438A1 (fr) 2018-05-09 2019-11-13 Rolex Sa Systeme de calendrier horloger
US11347186B2 (en) 2018-05-09 2022-05-31 Rolex Sa System for a watch calendar
EP4187327A1 (fr) * 2021-11-30 2023-05-31 Rolex Sa Système de calendrier horloger
EP4187329A1 (fr) * 2021-11-30 2023-05-31 Rolex Sa Système de transmission de mouvement pour calendrier horloger
EP4187328A1 (fr) * 2021-11-30 2023-05-31 Rolex Sa Système de calendrier horloger

Also Published As

Publication number Publication date
JPS515594B1 (enrdf_load_stackoverflow) 1976-02-20
DE2131532A1 (de) 1971-12-30

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