Abstract: A calendar electronic timepiece comprises a signal generating circuit for generating a date signal, a driving circuit for outputting a driving signal in accordance with the date signal generated by the signal generating circuit, and an ultrasonic motor driven by the driving signal outputted by the driving circuit. The ultrasonic motor is comprised of a piezoelectric vibrator having an electrode pattern and being driven by the driving signal outputted from the driving circuit to undergo expansion and contraction movement, a vibrating member connected to the piezoelectric vibrator and vibrationally driven by expansion and contraction movement of the piezoelectric vibrator, and a date dial disposed on the vibrating member to be frictionally driven by expansion and contraction movement of the piezoelectric vibrator.

Abstract: To provide an electronic timepiece enabling reliable detection of a state of rotation of an indication wheel such as a date dial.An ultrasonic motor 1130 has an ultrasonic rotor pinion 1134b. A date dial 1120 is disposed on a main plate 1102 in such a way as to rotate relative thereto. The ultrasonic rotor pinion 1134b is meshed with an intermediate date driving gear wheel 1142a. A date driving wheel 1150 is rotatably disposed on the main plate 1102. A date driving gear wheel 1150b is meshed with an intermediate date driving pinion 1142b. A date driving gear portion 1150b is meshed with a dial gear portion 1120a. A contact point spring 1160 is disposed on a spring guiding portion 1150d. The contact point spring 1160 rotates integrally with the date driving wheel 1150 through the rotation of the date driving wheel 1150. The state of rotation of the date driving wheel 1150 can be detected by contact of the contact point spring 1160 with the contact point pattern 1174.

Abstract: A timepiece has a gear train having a plurality of intermeshed gears including a 24 o'clock wheel. To avoid error, the phase angle of the 24 o'clock wheel at which a given detection state is assumed is equal to the phase angle of backlash of the gear train between forward and reverse rotations of the 24 o'clock wheel. An electrically conductive contact spring is mounted to the 24 o'clock wheel. A circuit board is provided with electrical contacts disposed to come into contact with the contact spring when rotated. A 24 o'clock detection circuit is connectd to the electrical contacts to input an angular position detection signal indicating the angular position of the 24 o'clock wheel when the contact spring contacts a respective one of the electrical contacts.

Abstract: A date movement for a clockwork movement including a member (8) for indicating the tens having four positions carrying a scale from <<zero>> to <<three>> or from <<one>> to <<three>> plus a blank, provided for effecting one step every ten days, and a member (10) for indicating the units arranged for effecting one step per day, characterised in that the units indicator member (10) can occupy thirty one positions and carries three successive scales from <<zero>> to <<nine>>, one of the three scales, called the modified scale, having an additional <<one>> inserted between its <<zero>> and its <<one>>.

Abstract: A multi-functional timepiece comprises a base, a wheel train mounted on the base for rotation, a cam member rotationally driven by the wheel train about a rotational center, and a rotary member mounted to undergo angular displacement in opposite directions. A display member is integrally connected to the rotary member for angular displacement therewith to display time or date information. An interconnecting member interconnects the cam member to the rotary member such that rotational motion of the cam member effects angular displacement of the rotary member in the opposite directions.

Abstract: A calendar watch comprises a calendar corrector setting wheel disposed on the dial side of a main plate and mounted for oscillation about a center of rotation within a second domain to correct a date indicator and a day corrector. The calendar watch also comprises a date normalizing device disposed on the dial side of the main plate for normalizing the date indicator within a third domain, a day indicator normalizing device for normalizing a day star within the second domain or the third domain, and a date indicator driving device and a day indicator driving device having a center of rotation within a fourth domain. A setting lever and a yoke are disposed on a side of the main plate opposite from the dial side.

Abstract: An illuminated date ring for a calendar wristwatch for viewing the date at night through a window in the dial, employs an electroluminescent (EL) lamp beneath a transparent date ring. The EL lamp electrodes extend around the ring, and flexible spring members make sliding contact with the electrodes as the ring rotates in the movement.

Abstract: A timepiece includes a date indicator with inner teeth moving angularly by one step per day. An indication control star meshes with the inner teeth of the indicator. A pinion that is integral and coaxial with the star drives an indicator wheel on which an indication arbor is centrally disposed. The rotary indicating structure is driven by the date indicator through the indication arbor and is intended to indicate cyclic parameters such as the date, the phase of the moon, the user's "cash balance," etc. Various types of indication, all controlled by the date indicator, make it possible to produce a wide range of watches of simple design with different display combinations.

Abstract: A timepiece such as a watch carries a date ring with a window display. The ring carries an engaging system capable of driving at the end of each month an annual ring having twelve or twenty four external teeth and five internal teeth. A calendar driving wheel set has a first finger capable of driving the date ring and a second finger capable of driving the annual ring. At the end of a month of thirty days, one of the five internal teeth of the annual ring appears on the path of the second finger and drives this ring in its travel, such ring, from being driven becomes a driving wheel and, via the engaging system, causes the date ring to advance to the first of the following month. A manual correction remains necessary at the end of the month of February.

Abstract: An analog electronic timepiece also having a display (4) for at least two other items of time information comprising a timekeeping circuit delivering a daily signal S.sub.j to a perpetual calendar circuit delivering, in response to a command signal S.sub.k, an order signal S.sub.c representing the ranking occupied by the information on the display (4), and a disc signal S.sub.D representing the value of the instantaneous ranking of the time information displayed, in which a comparator-subtractor analysing the signals S.sub.c and S.sub.D in recurring manner delivers a signal S.sub.R modifying the display (4) until S.sub.D =S.sub.C, said display (4) having at least two distinct zones (4a, 4b) provided with different symbols occupying successive rankings.

Abstract: A multifunctional holding plate for use in an analog wristwatch movement with a calendar date ring, a day of the week disc, an engageable time setting pinion and various gear members. The multifunctional holding plate is attached to the movement frame and has (1) retaining fingers to hold the gear members and date ring in place, (2) a flexible detenting spring leg to detent the date ring, (3) a flexible retaining leg to facilitate engagement of the timesetting pinion, and (4) a flexible detenting spring leg to detent the day disc.

Abstract: A horological piece includes a display (10) comprising a recurring cycle indicator (13) driven by an independent motor (11) and having a supplementary display position (14) at which a sign representative of the state of charge of an energy source controlling the display, is provided. The horological piece further includes a detection circuit (2, 16) adapted to, firstly, during the detection of a predetermined level of charge of the energy source, control the display so that the recurring cycle indicator is moved the required number of steps to display the representative sign and, secondly, jump the supplementary position during the normal operation of the horological piece.

Abstract: The annual calendar mechanism includes a calendar driving wheel (18) provided with a finger (17) adapted to drive a date wheel (19) through one step at the end of each month. An annual wheel (25), driven through two steps once per month by a long tooth (23) borne by an intermediate wheel (21), itself meshing with the date wheel (19), includes a plate (27) bearing five teeth (28). If one of these five teeth, corresponding to one of the months of less than thirty-one days, comes into the path of finger (17), the annual wheel, from being driven, becomes driving and drives the date wheel through an additional step via the intermediate wheel.

Abstract: A first mechanism (2, 5, 8, 18, 20) of the calendar drives a date indicator, bearing numbers 1 to 30, by one one-day step at the end of each day, off a rotary part (1) of an analog timepiece movement. A second mechanism (60, 62) causes the date indicator, in cooperation with the first mechanism, to move forward from the 29th to the 1st of the following month at the end of the even months. A third mechanism (75, 79, 95, 97) inhibits the action of the second mechanism at the end of the embolismic (or abundant) years whereby at the twelfth and final month of these years the date indicator displays 30 before proceeding to the 1st. The calendar is perpetual, and a date-corrector (11) and a month-corrector (54) enable the calendar to be updated.

Abstract: This invention concerns a timepiece of the mechanical and/or electromechanical type. Such piece comprises a first display mechanism (1), in particular a date display, a second display mechanism (2) such as a moon phase display, rapid correction means (4) for both display mechanisms (1, 2) and a driving organ (6) which controls such display mechanisms (1, 2) and which can absorb equally the displacement of one or the other of these mechanisms, such piece being characterized in that the rapid correction means (4) comprises meshing means (64) common to both mechanisms (1, 2), mounted for rotation and adapted to operate alternatively upon one or the other of such two mechanisms (1, 2) under the action of control means (72, 74). This invention is applicable to calendar and moon phase watches having a center date hand.

Abstract: A timepiece comprising a display (2) such as a data display and a driving motor (M1, M2) for driving the display is characterized in that the driving motor comprises a piezo-electric motor directly engaging the display.

Abstract: The wristwatch displays the date through a window in the dial. To achieve this, the watch comprises a rotatable disc (13) bearing a first series of numbers corresponding to some of the days of the month, and a second series of numbers corresponding to the remaining days, said series being arranged in two concentric circles. To ensure that the date numbers pass the hatch in chronological order, the disc is rotatably driven by a motor (70) combined with an endless screw (71), and translatably driven by a motor (72) combined with an endless screw (73) to pivot a circle sector (74) about a spindle (75). Both said motors are controlled by an electronic circuit (76).

Abstract: The device for implementing the method for the automatic initialisation of the date display of a perpetual calendar electronic watch comprising a face fitted with a window and a date disk permits, every time the watch stops, at the moment the electronic circuit is reconnected, the automatic identification of the date appearing in the window, by optically analysing a code attributed to this date and by memorizing this data by means of the electronic circuit. This optical device (10) comprises a source (11) emitting a beam of light (12), reflective surfaces (13) fixed onto the date disk (15) and a receiver (14). The beam (16) reflected by a surface (13) is intercepted by the receiver (14) which supplies a signal to the electronic circuit (17) which controls an electronic motor (18) driving the disk (15) by a system of reduction gears (19, 20).

Abstract: A wristwatch with analogue time display comprises a dial with a hatch (19), and a rotatable disc or hoop (10) bearing non-time indications. The disc is arranged in such a way that the indications provided thereon appear in the hatch via an opening provided in said disc and having a size which is equal to the size of each indication. Said opening reveals additional indications provided by an electro-optical display device (30) when said opening (21) coincides with said hatch (19).

Abstract: This chronograph-watch includes, superposed over one another and in the following order, a motor module (19), a chronograph module (27) and a dial (12). The motor module comprises a first date ring (17). The chronograph module includes a second date ring (28) located immediately under the dial and bearing indications (14) concerning the date which appear through an opening (13). The second ring (28) is controlled by the first ring (17), through a drive chain (32, 33, 34, 36) assembled in the chronograph module.

Abstract: The display of n+m symbols is achieved by means of an upper disk (1a), placed behind an aperture (2) in a cover plate, and of a lower disk (1b), placed behind the upper disk and comprising m sectors.One sector of the upper disk (1a) consists of a transparent window (4), the other n+m sectors of the two disks bearing the symbols.A gear-train (11, 12a, 12b, 13a, 13b) and a control cam (20), set in motion by a rotary driving member (10), cause the disks to rotate in steps of one sector, starting from a position in which the window (4) is located behind the aperture (2), such as to cause first the two disks to move forward together by one step, then the upper disk (1a) to move forward n successive steps, and finally the lower disk (1b) to move forward m-1 successive steps to return to the starting position.A positioning device (30a, 30b, 31a, 31b) blocks the disks (1a, 1b) when they are stationary, and releases them when required to move forward.

Abstract: A calendar display device for a timepiece having a spindle which selectively rotates to drive the timepiece. The display device includes a day of the week wheel selectively rotatably coupled to the spindle, and a dial overlying the day of the week wheel having a window, with the dial including indicia around the periphery of the window representative of each day of the week. The day of the week wheel includes a plurality of day of the week indicators spaced therearound along the circumference of a circle passing essentially through the center of the window so that it is the day of the week wheel is selectively rotated, the indicators sequentially appear through the window and point selectively to the indicia to indicate the actual day of the week. The dial may also include an elongated circumferential window therein with days of the month positioned on opposing sides of the window. A second wheel includes indicators thereon for pointing out the particular day of the month through the window.

Abstract: A calendar watch includes a central date indicator (4). The indicator is united with a crown wheel (9) comprising teeth (11) forming a circular crown (12) arranged to be perpendicular to a face (13) of said wheel. The teeth (12) are driven by a finger (14) rotating in a plane intersecting said crown in its height. The finger is united with a date driving wheel (15). The invention permits easy transformation of a watch having its date display in a dial aperture to a watch having a date indicator rotating about the center of the movement.

Abstract: A calendar display apparatus includes a reference signal generator, a calendar data generator, and rotational display members. The reference signal generator generates a reference signal every period of 24 hours. The calendar data generator generates year, month, date, and day data upon reception of the reference signal. The rotational display members are driven by signals from the calendar data generator so as to display a year, a month, a date, and a day. A scale corresponding to the rotational display member for displaying years is constituted by multiple circular scales. Scale marks representing years are sequentially and continuously formed on the multiple circular scales from its inner circumference to outer circumferences.

Abstract: A device for controlling or correcting the readout of the day of the week or date for an analog watch, comprising a crown cogged on the inside and integral with a date or day disk, a bi-directional drive motor and a drive wheel coupled to the drive motor, the drive wheel having two opposite spring-loaded clicks and an arcuate slot in which a fixed stud is engaged, the stud cooperating with the edges of the slot to limit the travel of the drive wheel. The drive mechanism of the date or day disk can thus be recentered automatically after the watch has stopped while simultaneously compensating the rated steps of the motor.

Abstract: The watch includes a time-keeping circuit, a first motor, hands driven by the motor to display the time, an index that moves forward by 1/35th of a revolution per 24 hours, a stationary graduation having inscribed thereon 35 days of 5 consecutive weeks, a mobile graduation divided into 35 parts and bearing numbers 1 to 31 for the ordinals of the month, a second motor that drives the mobile graduation in steps of 1/35th of a revolution, a calendar circuit issuing a signal that is representative of the month and a signal that is representative of the year, and a correction circuit connected to the calendar circuit and issuing a control signal to the second motor. At the end of each month, the mobile graduation is moved by the second motor through N steps (N=4,5,6 or 7) such that number 1 thereon comes to lie opposite the index at the beginning of the following month.

Abstract: A basic clockwork, initially arranged in such a way as to comprise two supplementary indicators, of the date and of the days of the week, which have been removed, is provided with an additional module carrying supplementary indicators, which can number two, three or even four. These indicators being separate from the basic clockwork, their position can be chosen very freely by a constructor. In order to prevent having to provide the clockwork with one or several supplementary control members, for the correction of said indicators, a correcting mechanism of the basic clockwork, comprising a control stem operating a sliding pinion is used. A shaft of the sliding pinion has been extended up to a frame of the additional module and carries a pinion meshing, according to the sense in which the control stem is operated, either with a wheel belonging to a correcting gear train of one of the supplementary indicators, or with a pinion belonging to a correcting gear train of another supplementary indicator.

Abstract: This invention is concerned with an analogue calendar watch able to display the hour, the day of the month perpetually, and whenever required, the number of the month via the day of the month display. The watch includes a first motor driving the time display in response to a time base signal, a perpetual calendar circuit including a day counter, a month counter and a year counter and receiving a daily signal supplied by a contact, a control circuit connected to the calendar circuit, and a second motor driving the day of the month display in response to a signal from the control circuit. The display of the number of the month is achieved with a reading circuit that receives from the calendar circuit signals representative of the contents of the day and month counters.

Abstract: A time indicator for a timepiece is driven by an arrangement comprising a driving train and a transmission assembly. The driving train includes a finger adapted to drive a pinion of small diameter and a circular flange adapted to block a pinion of large diameter. The small and large diameter pinions are coaxial, fixed to one another and compose the transmission assembly. In this manner the time interval in passing from one indication to another is diminished while avoiding the butting phenomenon of teeth resting on the circular flange.

Abstract: A watch having a crown for setting the motion work and having a device, which can be driven by the hour wheel of the movement of the watch, for the automatic display of the months and the days of the month in accordance with the Gregorian calendar. In this connection, the display of the day of the month can be driven by a date wheel 13 and the display of the month by a month wheel 22 of the device. A year wheel of a year display and a decade wheel 26 of a decade display and possibly a century drive of a century display form together with the wheelwork of the month display and the day of the month display a closed coupling-less calendar wheelwork train whose date wheel 13 can be set by a correction device.

Abstract: The operating mechanism for a watch indicating arrangement, especially for a date indicating structure of an electrically operated wristwatch provided with an indicating element which is advanced periodically and operated by a drive mechanism associated with the watch, the operating mechanism includes a non-uniform transmission gear structure with a driving and a driven gear which have at least one engagement mode in which the non-uniform rotational speed of the driven gear is relatively low while the available torque is relatively high and the driven gear has associated therewith means for engaging the indicating structure for advancing the indicating element a predetermined step with each revolution of the driven gear wherein the means for engaging the indicating element are so arranged that engagement of the indicating element for its advance takes place while the non-uniform transmission is in the highest torque providing engagement mode.

Abstract: The perpetual calendar mechanism of the invention comprises in addition to the months indicator a four year cycle indicator which displays successively the normal years and the leap-year. The four year cycle indicator is controlled directly or indirectly by a rotatable assembly journalled on the month star such assembly including a year cam and a Maltese cross enabling it to effect one revolution every four years. In one variant illustrated the mechanism includes a first ring bearing the year indications and a second ring concentric to the first ring bearing an index marker. At each year change the index marker is shifted a quarter turn relative to the indications borne by the first ring.

Abstract: The driving mechanism of the day of the month disk (18) comprises a driving wheel (14) and a transmission wheel (16) The driving wheel (14) comprises a toothed sector (26'a, 26'a) which can mesh with the pinion (44) of the transmission wheel (16) and peripheral wall surface (26'a) into which open the two ends (30' and 30") of an arcuate groove (30). The transmission wheel (16) also comprises a member constituted by four arms (48a to 48d) carrying four studs (50a and 50d) which can enter the groove (30) and a pinion (52) which meshes with the disk (18). Outside the driving phases, two of the studs abut against the peripheral wall surface (26'b) in order to lock the disk (18). This mechanism provides for a low torque which enables the energy to be applied to the motor of the watch to be reduced.

Abstract: The invention relates to an indexing gear for timekeeping devices comprising a toothed wheel having an indexing tooth, a pinion indexable two teeth at a time by means of the indexing tooth of the indexing wheel, said pinion being secured against rotation between indexing operations by a shoulder of the indexing wheel, and also comprising a driven toothed wheel meshing with the pinion, the pinion having, according to the invention, slotted teeth or teeth elastically deformable in some other way, which interact with the shoulder of the indexing wheel and the teeth of the toothed wheel, such that a gear drive is obtained which is completely without any play.

Abstract: A wristwatch with a stepping motor driving the hands through a normal gear train also includes a supplementary gear train driving a circumferential date ring showing the calendar date. The gear train includes a planetary gear assembly, which may also be selectively operated by an exterior manually rotatable button to change the date without interfering with the normal driving of the date ring from the stepping motor. Preferably the manually rotatable button is operable from the back of the watch using a ball-point pen or the like.

Abstract: The mechanism comprises a date-disc (8) actuated at midnight by a lever (1) supporting a rotary part (3) with catches (3a) gearing with the wheel (4) of 24 h. The mechanism is so designed that each transition from a date to the next is effected in less than one hour so that the calendar remains still in synchronism with the hours hand, even in the case of the changing of the indication of time-zones. The disc comprises pins (14) controlling at the end of each month through a star-wheel (13) the rotation of a first (17) and a second (20) cam. The cams bear finger-pieces (17a,17b,21) the ones (17a,17b) of the first cam having variable widths according to the different lengths of the months forming bankings for a catch (9) of the lever (1) for hindering the return motion of this lever thus prolonging the duration of the gearing of the rotary part (3) with the disc (8).

Abstract: This watch comprises a date crown or date disc (9) pivoted onto a plate (10) and completely independent of a driving gear train (1, 2, 3). A second micro-motor (14) drives this crown (9) in its angular displacements.

Abstract: An instantaneous calendar device is disclosed.The instantaneous calendar device comprises a stationary part, for example, a bridge, a date ring, a day disk, a rotary shifter, and an actuator. The rotary shifter operates the date ring and the day disk. The actuator is composed of a spring, a tappet, and a calendar wheel coaxial with a cam. The cam of the actuator is rigidly secured to the stationary part of the device, whereas the tappet and the spring are mounted on the rotary shifter.

Abstract: An electronic watch comprising a device for controlling and driving the day of the month disc, wherein the wheel train supplies the energy necessary for moving the day of the month disc, but does not determine the instant of the jump, which may be initiated at any moment by an electrical signal, independently of the position of the wheel train.The device comprises a mechanism driven by the wheel train and arranged so as to disengage when the moving bodies of the wheel train, controlling the display, turn continuously in clockwise direction and to re-engage when said moving bodies turn in anti-clockwise direction. A control circuit determines, in a portion of the driving cycle in an anti-clockwise direction of rotation with a rapid rate, the jump of the display disc of the day of the month mechanism.

Abstract: An electronic timepiece equipped with calendar display means adapted to be driven by a drive motor means provided independently of a drive motor means adapted for driving time indicating hands. The drive motor means for driving the calendar display means is driven by a drive system which comprises a calendar memory circuit responsive to a reference signal, i.e., a 00:00 AM signal indicative of midnight, to update the content of the calendar memory circuit, a drive signal setting circuit coupled to said calendar memory circuit and generating a calendar information signal in response to the content of said calendar memory circuit, and a driver circuit responsive to said calendar information signal to generate a drive signal for energizing said drive motor means for driving said calendar display means.

Abstract: A calendar display wheel guard for a calendar timepiece, for rotatably mounting a calendar display wheel and for spacing a dial plate of the timepiece from the calendar display wheel. The calendar display wheel guard comprises a body having a bore opening at a pair of opposite ends thereof, a first end portion having a major surface defining a first end face of the wheel guard, and a second end portion for fastening the wheel guard to a back plate. An intermediate portion of the wheel guard, between the first and second end portions thereof, extends through a central opening of the calendar display wheel to mount the display wheel for rotation. The first end of portion of the wheel guard has the maximum diameter of the wheel guard, and the end face of the first end portion of the wheel guard abuts a dial plate of the calendar timepiece so that the first end portion of the wheel guard maintains the dial plate spaced from the calendar display wheel.

Abstract: An electronic analog calendar timepiece includes a mechanism for automatically correcting the date indication at the ends of months having less than 31 days. A second motor activates the month correction-mechanism in short months to advance the date dial by additional indicated days. Such irregular advancements occur in accordance with the condition of switches associated with the 29th, 30th, and 31st day positions of the date dial, and in accordance with data stored in memory to correlate with the displayed month of the year. A conventional driving mechanism associates with conventional time keeping circuitry to advance the hands and the day, date, and month indicators for all days occurring in the month. The month-end correcting mechanism is linked to the conventional driving mechanism by actuation of the second motor.

Abstract: A drive mechanism for an additional mechanism of an electronic timepiece having a time-keeping system driven by a reversible stepping motor, in which an auxiliary driving source is arranged to accumulate energy utilizing a drive power transmitted from a time-keeping system for driving additional mechanism, and locking means maintains the energy stored in the auxiliary driving source.

Abstract: The date driving mechanism of a watch comprises a date driving wheel having a partially teethed portion engaged with teeth of a calendar driving wheel which in turn drives a calendar display dial so as to advance the calendar display dial a given amount each rotation of the date driving wheel. A cam integral with the date driving wheel engages a pivotal control member so as to hold the control member against the calendar driving wheel normally to restrain movement of the date dial. The cam has a flat side so as to release the calendar driving wheel from restraint when being driven by the teethed portion of the date driving wheel, thereby relieving load on the date driving wheel. The control member has a resilient arm which yields to permit manual correction of the calendar display.

Abstract: A watch contains a date indicator ring and a day of week indicator ring. A switching wheel is displaceable selectively into meshing engagement with the indicator rings to effect adjustment thereof. The switching wheel is actuated by a shaft which is axially displaceable between selection and working positions. In its selection position, the shaft can be rotated in either direction to selectively place the switching wheel in one of two preliminary locations corresponding to a date ring adjustment location and a day of week ring adjustment position. By then axially displacing the shaft to its working position, the switching wheel is displaced to a final location to effect the previously selected mode of adjustment. Such adjustment is effected by rotating the shaft in either direction to rotate the respective indicator ring in either direction.

Abstract: A day disk cooperates with a storage of mechanical energy via a seven-position Maltese mechanism. A Maltese cross of said mechanism is rigidly coupled to and coaxial with the day disk. A transfer pin of the Maltese cross is set on an intermediate gear of the storage. A driven disk includes a projection for the transfer of a toothed date ring. The locking surfaces of the Maltese cross lock on the driven disk. Provision is made of a free unloaded lever with one arm locking in position the date ring and the other arm of said lever resting against the projections of the Maltese cross, thereby relieving the moment of load of the calendar device on the gear train and improving the reliability of the timepiece.

Abstract: A month correcting mechanism for calendar timepieces comprises a month indicating dial having a toothing and a month dial correcting lever assembly adapted to be engaged with the toothing of the month indicating dial. By manually actuating the month dial correcting lever assembly, the month indicating dial may be rotated independently of the date dial to correct the indication of the month.

Abstract: A display device for calendar timepieces having a month display for the purpose of displaying the date indication in large size. To this end the device comprises a date dial and month dial, in which the month indication is displayed only at beginning of the month for informing the change of month. The month display may be performed by disclosing the month indication through an opening provided in the date dial through which the month indication is revealed or by utilizing a month indicating projection radially projected over the date dial.

Abstract: An electronic watch movement including a base plate having a pair of opposite major surfaces. A calendar ring is disposed confronting a first of the major surfaces, and a circuit board is disposed confronting the second major surface. The calendar ring has a narrow central annular portion, a wide peripheral skirt portion circumscribing the narrow central annular portion and a circular step portion extending between the narrow central annular portion and the wide peripheral skirt portion. The skirt portion of the calendar ring is spaced further from the base plate then the central annular portion of the calendar ring. The base plate has openings therethrough opposite the skirt portion of the calendar ring, and electronic watch components are mounted on the major surface of the circuit board and extend through the openings through the base plate beyond the narrow central annular portion of the calendar ring toward the wide peripheral skirt portion of the calendar ring.

Abstract: A calendar timepiece which does not require any manual date correction at the end of even months is disclosed. The timepiece comprises an even months date correction claw mounted on a date rotational wheel and displaced into a correction position when a claw driving coil is energized by a signal delivered from means for discriminating odd months from even months.