JP2019060678A - Clock having retrograde display mechanism - Google Patents

Abstract

To reduce drive torque, as causing a retrograde display mechanism to appropriately act in a clock having the retrograde display mechanism.SOLUTION: A clock 1 comprises: a turning wheel 30 that consecutively turns; an actuation cam wheel 40 that has an actuation cam 41 engaging with the turning wheel 30 formed; a day-of-week actuation lever 50 of which a posture varies with a contact position change in a cam surface 41a in contact with the cam surface 41a of the actuation cam 41,; a day-of-week display part 20 that conducts retrograde actuation in accordance with the posture of the day-of-week actuation lever 50; a day-of-week wheel jumper 60 that urges in a direction of pressing the day-of-week actuation lever 50 against the cam surface 41; and a driving non-toothed member 34 and a driven non-toothed member 44 that mutually engage as a non-toothed mechanism converting consecutive turning of the turning wheel 30 to intermittent turning of the actuation cam wheel 40. The turning wheel 30 has the driving non-toothed member 34, and the actuation cam wheel 40 has the driven non-toothed member 44.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a watch having a retrograde indication mechanism.

  In the retrograde display mechanism, a pointer supported by a pointer shaft protruding from the main point (the center of a fan-shaped arc) of the fan-shaped index display portion formed on the dial is displayed from one end side of the fan to the other end When the pointer is turned to the side and the pointer reaches the other end of the fan, the pointer is instantaneously reversed (flyback) and returned to one end immediately (retrograde operation).

  The retrograde display mechanism is configured using a retrograde operating cam (hereinafter simply referred to as an operating cam) and a cam lever contacting the cam surface of the operating cam. The cam lever has a contact portion that contacts the cam surface of the actuating cam on one end side of the rotation center.

  The cam lever is in direct or indirect engagement with a display vehicle that displays a retrograde display. The attitude of the cam lever changes according to the movement of the actuating cam, the display car moves according to the change of the attitude of the cam lever, and the display car is moved by the sudden attitude change of the cam lever when passing through the abrupt step on the cam surface. A retrograde operation is performed instantaneously to perform retrograde display (see, for example, Patent Document 1).

  As the engagement between the cam lever and the display wheel, for example, a tooth (actuating lever tooth) is formed on the other end side of the cam lever across the rotation center, and this actuating lever tooth is used as a gear of the display wheel It may be engaged with the wheel gear).

Patent No. 5850767

  By the way, it is necessary to apply a biasing force to the cam lever so that the contact portion of the cam lever does not separate from the cam surface of the actuating cam. This biasing force is generated, for example, by providing a display wheel control lever (jumper) and meshing the teeth of the display wheel jumper with the display wheel gear. Specifically, the display car jumper biases the display car in the reverse rotation direction by its elastic force. The torque applied to the display wheel acts in the direction in which the contact portion of the cam lever presses the cam surface of the actuating cam. As a result, the cam lever does not separate from the cam surface of the actuating cam.

  On the other hand, the operating cam needs to be provided with a jumper (cam jumper) also on the operating cam so that the operating cam does not reversely rotate due to reaction force or posture change of the contact portion of the cam lever or an input impact.

  Therefore, when rotating the display wheel, it is necessary to rotate the actuating cam at a torque exceeding the torque of the braking force by the cam jumper and the torque of the braking force by the display vehicle jumper, and a reduction of the driving torque is required.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a watch having a retrograde display mechanism capable of reducing a driving torque while appropriately operating the retrograde display mechanism.

  According to the present invention, there is provided a continuously rotating driving wheel, a driven wheel engaged with the driving wheel having a retrograde operating cam, and a contact surface on the cam surface in contact with the cam surface of the retrograde operating cam. A cam lever whose posture changes in response to a change, a display unit that operates retrogradely in accordance with the posture of the cam lever, a jump control member that biases the cam lever in a direction to press the cam lever, and a continuous drive motor A driving missing tooth member and a driven missing tooth member that engage with each other as a missing tooth mechanism that converts a large rotation into the intermittent rotation of the driven vehicle, and the driving wheel has the above-mentioned driving missing tooth member, The driven wheel is a timepiece provided with a retrograde display mechanism having the driven toothless member at a position different from the retrograde operating cam in the axial direction of the driven wheel.

  According to the watch having the retrograde display mechanism according to the present invention, the drive torque can be reduced while appropriately operating the retrograde display mechanism.

FIG. 1 is an external view showing a date-time electronic timepiece that is an embodiment of a timepiece having a retrograde display mechanism according to the present invention. It is the perspective view which looked at the retrograde display mechanism in the day display part of a timepiece through the dial. It is the top view which looked at the action | operation cam wheel from upper direction. It is a top view which shows the outline shape (cam surface) of the action | operation cam of an action | operation cam wheel. It is a perspective view showing a turning wheel. It is a schematic diagram which shows the engagement state of the driving missing member of a turning wheel and the driven missing tooth member of the operating cam wheel, wherein the convex arc surface of the driving missing tooth member contacts the concave surface of the driven missing tooth member A state in which the rotation of the driving missing member is not transmitted to the driven missing member is shown. It is a schematic diagram which shows the engagement state of the driving missing member of a turning wheel and the driven missing tooth member of the actuating cam, and the arc surface starts to separate from the concave and the teeth of the driving missing member start pushing the side of the concave Show the condition. It is a schematic diagram which shows the engagement state of the driving missing member of a turning wheel and the driven missing tooth member of the actuating cam, and the teeth of the driving missing member and the teeth of the driven missing tooth member are engaged with each other. State of rotation of the wheel is transmitted to the driven toothless member. It is a schematic diagram which shows the engagement state of the driving missing member of a turning wheel and the driven missing tooth member of the actuating cam, and the teeth of the driving missing member separate from the teeth of the driven missing tooth member and the arc surface becomes concave. Indicates a state where contact has begun. It is an enlarged view of a portion where the arc surface of the driving missing tooth member has a protrusion formed on the arc face and the concave surface of the driven missing tooth member is in contact. It is an enlarged view which shows the state which a circular arc surface (protrusion part) separates from a concave surface. It is an enlarged view of a portion in which a circular arc surface of a driving missing tooth member and a concave face of a driven missing tooth member are in contact. It is an enlarged view which shows the state which a circular arc surface (without a protrusion part) leaves | separates from a concave surface.

  Hereinafter, an embodiment of a watch having a retrograde display mechanism according to the present invention will be described with reference to the drawings.

<Configuration of Electronic Clock>
FIG. 1 is an external view showing a daytime electronic timepiece 1 (hereinafter simply referred to as a timepiece 1) which is an embodiment of a timepiece having a retrograde display mechanism according to the present invention, and FIG. 70 is a perspective view of the dial 10 seen through. FIG. The upper side of FIG. 1 is, for example, the 12 o'clock direction, and the left side is, for example, the 9 o'clock direction.

  As shown in FIG. 1, the watch 1 indicates the dial 10 (numbers and letters are not shown) on which the numbers or characters of the time (hereinafter referred to as digits) are displayed, and the numbers of the dial 10, etc. An hour hand 16, a minute hand 17, and a second hand 18 which rotate around a center C0, a movement 3, a day display unit 20, and a date display unit 8 are provided. In addition to these, the timepiece 1 includes a battery as a power source and a small hand for displaying various functions, but the explanation thereof will be omitted since it is not directly related to the present invention.

  A small window 11 is opened in the direction of 3 o'clock indicated by the hour hand 16 of the dial 10. The small window 11 exposes any one of the numbers from "1" to "31" representing the date of the calendar displayed on the date wheel 9 disposed on the back side of the dial plate 10. . The date display unit 8 is configured of a small window 11 and a date wheel 9.

  A day display unit 20 is formed in the direction of 9 o'clock indicated by the hour hand 16 of the dial 10. The day display unit 20 includes a sector-shaped indicator 21 formed on the dial 10 and a day hand 22. In the indicator portion 21, seven letters 21 a (“S” (Sunday), “M” (Monday),... “S” (Saturday)) representing the day of the week are shown clockwise in the sector-shaped arc portion. They are displayed side by side at equal angular intervals. On the axis (true) of the weaver 23, the day hand 22 penetrates the dial 10 from the back side of the dial 10 and protrudes to the front side in the vicinity of the fan-shaped essential point (center) of the index portion 21. It is fixed. The day hand 22 indicates the day of the week by pointing to one of seven characters 21a representing the day of the week according to the movement around the center C5 of the axis of the day wheel 23.

  The day wheel 23 constitutes a part of the retrograde display mechanism 70 shown in FIG. 2, and the retrograde display mechanism 70 allows the day hand 22 to start from the letter 21a of "S" at the lower end representing Sunday, The character 21a, the character 21a of "T", the character 21a of "W", the character 21a of "T", the character 21a of "F", the character 21a of "S" at the top representing Saturday, and so on; In other words, a retrograde operation is performed, which is a back-and-forth movement back and forth (fly back) to a position pointing to the lowermost "S" character 21a representing Sunday. 2 is a view seen through the dial 10, the clockwise rotation of the day wheel 23 in FIG. 1 corresponds to the clockwise rotation of the day wheel 23 in FIG.

  The retrograde display mechanism 70 is provided in the movement 3 and, as shown in FIG. 2, the turning wheel 30 (motor wheel), the retrograde operating cam wheel 40 (follower car, hereinafter referred to as the operating cam wheel 40), and the day The operating lever 50 (cam lever), the drive wheel 23, and the drive wheel 60 (vibrating member) are provided.

  FIG. 3 is a plan view of the actuating cam wheel 40 as viewed from above, and FIG. 4 is a plan view showing the contour shape (cam surface 41a) of the retrograde actuating cam 41 (hereinafter referred to as actuating cam 41) of the actuating cam wheel 40. . The operating cam wheel 40 rotates about an axis C2. As shown in FIG. 3, in the actuating cam wheel 40, an actuating cam 41, which is an example of a retrograde actuating cam, and a driven toothless member 44 are integrated at different positions in the axial center C2 direction with the axial centers C2 aligned. It is formed.

A contact portion 52 of a day operating lever 50, which will be described later, contacts a cam surface 41a which is a contour surface of the operating cam 41. The cam surface 41a is opposite to the rotational direction (for example, clockwise direction in FIG. 4) of the operating cam wheel 40.
(1) In the angle range A, the distance from the axial center C2 to the cam surface 41a is a minimum constant length,
(2) In the angular range C, the distance from the axial center C2 to the cam surface 41a is a fixed length longer than the distance in the angular range A,
(3) In the angle range E, the distance from the axial center C2 to the cam surface 41a is a fixed length longer than the distance in the angle range C,
(4) In the angle range G, the distance from the axial center C2 to the cam surface 41a is a fixed length longer than the distance in the angle range E,
(5) In the angle range I, the distance from the axial center C2 to the cam surface 41a is a fixed length longer than the distance in the angle range G,
(6) In the angle range K, the distance from the axial center C2 to the cam surface 41a is a fixed length longer than the distance in the angle range I,
(7) In the angle range M, the distance from the axial center C2 to the cam surface 41a is formed to be the longest fixed length longer than the distance in the angle range K.

  In the angular range M, in addition to the portion of the longest length in the above (7), the portion where the distance from the axial center C2 to the cam surface 41a is formed to the same minimum fixed length as the angular range A The angle range M and the angle range A are integrated in a portion which is formed and formed to have a minimum fixed length.

Further, the cam surface 41 a is opposite to the rotational direction of the actuating cam wheel 40,
(8) In the angular range B between the angular range A and the angular range C, the distance from the axial center C2 to the cam surface 41a gradually increases from the distance in the angular range A to the distance in the angular range C,
(9) In the angular range D between the angular range C and the angular range E, the distance from the axial center C2 to the cam surface 41a gradually increases from the distance in the angular range C to the distance in the angular range E,
(10) In the angular range F between the angular range E and the angular range G, the distance from the axial center C2 to the cam surface 41a gradually increases from the distance in the angular range E to the distance in the angular range G,
(11) In the angle range H between the angle range G and the angle range I, the distance from the axial center C2 to the cam surface 41a gradually increases from the distance in the angle range G to the distance in the angle range I,
(12) In the angular range J between the angular range I and the angular range K, the distance from the axial center C2 to the cam surface 41a gradually increases from the distance in the angular range I to the distance in the angular range K,
(13) In the angular range L between the angular range K and the angular range M, the distance from the axial center C2 to the cam surface 41a gradually increases from the distance in the angular range K to the distance in the angular range M.

  The driven toothless member 44 is formed larger than the operating cam 41. The driven toothless member 44 engages with the driving toothless member 34 of the turning wheel 30 described later, and forms a toothless mechanism with the driven toothless member 34 and the driven toothless member 44. The tooth loss mechanism converts continuous rotation of the driving tooth missing member 34 into intermittent rotation of the driven tooth missing member 44, and maintains a non-rotational stop state for a non-rotation period in intermittent rotation. A mechanism to perform the

  The driven toothless member 44 has a tooth portion 43 having four teeth 43a and a concave surface 42 recessed inward in the radial direction from the axial center C2. Seven concave surfaces 42 are formed at equal angular intervals in the circumferential direction around the axial center C2. The tooth portion 43 is formed between two adjacent concave surfaces 42 and 42, and seven tooth portions 43 are also formed at equal angular intervals in the circumferential direction. One tooth portion 43 and one concave surface 42 are provided for each character 21 a of the day of the week indicated by the day hand 22. Details of the teeth 43 and the concave surface 42 will be described later.

  FIG. 5 is a perspective view showing the turning wheel 30. As shown in FIG. The movement 3 is provided with a step motor and a drive wheel train which are not shown. Then, continuous rotation of the step motor is transmitted to the gear (not shown) of the turning wheel 30 via the driving wheel train, and the turning wheel 30 continuously rotates, for example, counterclockwise in the figure.

  As shown in FIG. 5, the turning wheel 30 is provided with a driving missing tooth member 34 engaged with the driven missing tooth member 44 of the operating cam wheel 40. The driving missing tooth member 34 constitutes a missing tooth mechanism together with the driven missing tooth member 44, and intermittently rotates the driven missing tooth member 44 clockwise with respect to the continuous counterclockwise rotation of the driving missing tooth member 34. Rotate.

  The motor drive toothless member 34 has an outer peripheral portion formed by an arc surface 32 which is a convex arc surface and a tooth portion 33 formed of five teeth 33 a. The arc surface 32 and the teeth 33 are alternately formed at two positions in the circumferential direction. The two arc surfaces 32, 32 are disposed to face each other (at equal angular intervals of 180 [degree]) across the axial center C1 as the rotation center, and the two teeth 33, 33 also sandwich the axial center C1. It is an arrangement (of equal angle intervals of 180 degrees) facing each other. Each tooth portion 33 is formed so that the dimension in the radial direction from the axial center C <b> 1 is larger than that of the arc surface 32, and protrudes outward in the radial direction from the arc surface 32.

  FIGS. 6, 7, 8 and 9 are schematic views showing the engaged state of the driving missing member 34 of the turning wheel 30 and the driven missing member 44 of the operating cam wheel 40. As shown in FIG. Here, FIG. 6 shows a state where the convex circular arc surface 32 of the driving missing member 34 contacts the concave surface 42 of the driven missing tooth member 44 and the rotation of the driving missing tooth member 34 is not transmitted to the driven missing tooth member 44. 7 shows a state where the arc surface 32 starts to separate from the concave surface 42, and the teeth 33a of the driving missing member 34 start pushing the side surface of the concave 42, and FIG. 8 shows the teeth 33a and the teeth 43a of the driven missing member 44 and 9 shows the state in which the rotation of the driving missing member 34 is transmitted to the driven missing tooth member 44, and FIG. 9 shows the state where the tooth 33a is separated from the tooth 43a and the arc surface 32 starts to contact the concave surface 42.

  The driven toothless member 44 of the actuating cam wheel 40 is disposed at the same axial position as the driving toothless member 34 of the turning wheel 30, and engages with the driving toothless member 34. Each concave surface 42 of the driven toothless member 44 is in contact with the circular arc surface 32 at two places, and the convex portion of the circular arc surface 32 is in a state in which the convex portion of the circular arc surface 32 rushes into the space between the two places.

  Since the arc surface 32 has a constant radius from the axial center C1, as shown in FIGS. 5 and 6, it can rotate around the axial center C1 even when in contact with the concave surface 42, but the concave surface 42 It can not go over the convex part of the circular arc surface 32 and rotate around the rotation center (axis C2). Therefore, not only the rotation of the driving missing member 34 is not transmitted to the driven missing member 44, but the driving missing member 34 keeps the driven missing member 44 in a stopped state.

  When the driving tooth missing member 34 rotates counterclockwise and the arc surface 32 separates from the concave surface 42 of the driven tooth missing member 44 as shown in FIG. 7, the restraint of the driven tooth missing member 44 is released, and the axial center It is possible to rotate clockwise around C2. Then, when the tooth portion 33 protruding beyond the arc surface 32 hits the side surface of the concave surface 42, it is pushed by the tooth 33a of the tooth portion 33 and the driven toothless member 44 rotates about the axis C2. When the driving missing member 34 further rotates, the teeth 33 (teeth 33 a) of the driving missing teeth 34 mesh with the teeth 43 (the teeth 43 a) of the driven missing teeth 44, and the meshing causes the driving missing teeth 34 to The rotation is transmitted to the driven toothless member 44, and the driven toothless member 44 rotates as the driving toothless member 34 rotates.

  When the rotation of the driving missing member 34 advances and the tooth 33 separates from the tooth 43, the rotation of the driven missing tooth member 44 stops, and the arc surface 32 of the driving missing tooth member 34 becomes the concave surface 42 of the driven missing tooth 44 The driven toothless member 34 keeps rotating while the driven toothless member 44 is kept stopped. Thus, the toothless mechanism constituted by the driving toothless member 34 and the driven toothless member 44 converts continuous rotation of the driving toothless member 34 into intermittent rotation of the driven toothless member 44.

  In the actuating cam wheel 40, the actuating cam 41 and the driven toothless member 44 are integrally formed, so that the intermittent rotation of the driven toothless member 44 results in the intermittent rotation of the actuating cam 41. Since seven concave surfaces 42 of the driven toothless member 44 are formed at equal intervals in the circumferential direction, the operation cam 41 stops seven times during one rotation.

  As shown in FIG. 2, the day operating lever 50 swings about a center C3 as a rotation center. In the day operation lever 50, a contact portion 52 in contact with the cam surface 41a of the operation cam 41 is formed at one end, and a tooth 51 along the circumferential direction around the center C3 is formed at the other end . The teeth 51 mesh with the gear 24 of the drive wheel 23. The cam surface 41a with which the contact portion 52 of the day operation lever 50 is in contact by the rotation of the operation cam 41 in FIG. 2 in the clockwise direction is the above (1) → (8) → (2) → (9) → 3) → (10) → (4) → (11) → (5) → (12) → (6) → (13) → (7) and so on, the distance from the axial center C 2 becomes longer .

  Therefore, when the cam surface 41a in contact with the contact portion 52 is in the period of (1) → (8) → ... → (7), the day actuating lever 50 stops and rotates counterclockwise around the center C3 in FIG. Repeat the movement. At this time, the day operating lever 50 in contact with the cam surface 41a repeats the stop and the clockwise rotation around the center C3.

  When the cam surface 41a with which the contact portion 52 of the day operation lever 50 is in contact is the above (1), the day hand 22 fixed to the date wheel 23 represents the Sunday of the index portion 21 shown in FIG. It corresponds so that the character 21a of "S" may be designated.

  Similarly, when the cam surface 41a with which the contact portion 52 is in contact is the above (2), the day hand 22 indicates the character 21a of "M", and the cam surface 41a with which the contact portion 52 is in contact is the above (3) When the day hand 22 indicates the character 21a of "T" (Tuesday), and the cam surface 41a in contact with the contact portion 52 is the above (4), the day hand 22 indicates the character 21a of "W" and makes contact When the cam surface 41a with which the portion 52 is in contact is the above (5), the day hand 22 indicates the character 21a of "T" (Thursday), and when the cam surface 41a with which the contact portion 52 is in contact is the above (6) The day hand 22 indicates the letter 21a of "F", and when the cam surface 41a with which the contact portion 52 is in contact is the above (7), the day hand 22 indicates the letter 21a of "S" (Saturday) doing.

  When the cam surface 41a with which the contact portion 52 of the day operation lever 50 is in contact is the above (1), (2), (3), (4), (5), (6), (7) Even if the operation cam 41 slightly rotates, since the distance from the axial center C2 to the cam surface 41a is constant, the day operation lever 50 does not rotate, and the day needle 22 does not rotate. That is, the above (1), (2), (3), (4), (5), (6) and (7) form a dead zone (inoperative area) in which the day hand 22 does not rotate. The needle 22 maintains the indication of the indicated character 21a.

  On the other hand, the range of movement from (8), (9), (10), (11), (12), (13) and (13) to (1) above is the working area where The character 21a designated by the day hand 22 is sequentially changed.

  Here, when the cam surface 41a with which the contact portion 52 of the day operation lever 50 is in contact is the above (1), (2), (3), (4), (5), (6), (7) The correspondence relationship is set such that the concave surface 42 of the driven toothless member 44 is in contact with the arc surface 32 of the driving toothless member 34.

  Also, when the cam surface 41a with which the contact portion 52 of the day operation lever 50 is in contact is the above (8), according to the clockwise rotation of the operation cam 41, the day hand 22 fixed to the date wheel 23 is It turns so that the character 21a of "M" may be designated from the character 21a of "S" (Sunday).

  Similarly, when the cam surface 41a with which the contact portion 52 is in contact is the above (9), the day hand 22 is rotated from the letter 21a of "M" to "T" (Tuesday) according to the clockwise rotation of the operation cam 41. When the cam surface 41a which is rotated to point to the character 21a and in contact with the contact portion 52 is the above (10), the day hand 22 is "T" (Tuesday) according to the clockwise rotation of the operation cam 41. When the cam surface 41a in contact with the contact portion 52 is the above (11) according to the rotation of the operating cam 41 in the clockwise direction, the day hand is rotated so as to designate the character 21a of "W" from the character 21a. 22 rotates so as to indicate the character 21a of "T" (Thursday) from the character 21a of "W", and when the cam surface 41a with which the contact portion 52 is in contact is the above (12), clockwise rotation of the operation cam 41 Day hand 22 according to the direction of rotation It rotates so that the character 21a of "F" can be indicated from the character 21a of "T" (Thursday), and when the cam surface 41a with which the contact part 52 is in contact is the above (13), clockwise direction of the operation cam 41 In accordance with the rotation of the day hand 22, the day hand 22 rotates so as to indicate the character 21 a of “S” (Saturday) from the character 21 a of “F”.

  In addition, in a period in which the cam surface 41a in contact with the contact portion 52 moves from (13) to (1), the day actuating lever 50 rotates clockwise about the center C3 in FIG. At this time, the day hand 22 fixed to the day wheel 23 is momentarily rotated counterclockwise so as to indicate the character 21a of "S" (Sunday) from the character 21a of "S" (Saturday) (Fly Back).

  Here, when the cam surface 41a with which the contact portion 52 of the day operation lever 50 is in contact is the above (8), (9), (10), (11), (12), (13), and (13) In the period of movement from (1) to (1), the correspondence relationship is set such that the teeth 43 of the driven toothless member 44 mesh with the teeth 33 of the driving toothless member 34.

  The date indicator jumper 60 is formed of an elastic member such as resin or metal. The day wheel jumper 60 is formed in a substantially U-shape as shown in FIG. The day wheel jumper 60 is rotatably supported at a center C4 formed at a position deviated from the vicinity of the U-shaped arc-shaped curved portion. Among the parts of the U-shaped jumper 60 extending from the arc-shaped curved portion to the two tips, teeth are formed along the circumferential direction around the center C4 at the tip on the side where the center C4 is formed. A meshing portion 61 is formed. The teeth of the meshing portion 61 mesh with the gear 24 of the drive wheel 23. In the U-shaped jumper 60 of the U-shaped portions extending from the arc-shaped curved portion to the two tips, the base C of the movement 3 is radially directed to the tip of the U-shaped side extending to the other side where the center C4 is not formed. The press part 62 which contacted from the outer side of is formed.

  The drive gear 60 is elastically deformed in a state where the pressing portion 62 is in contact with the base plate or the like, and the elastic force generated by the elastic deformation causes the meshing portion 61 to rotate the drive gear 23 counterclockwise with respect to the drive gear 23. The torque to be rotated is applied to the gear 24. The torque applied to the gear 24 by the elastic force causes the torque for rotating the day actuating lever 50 in the clockwise direction to act on the day actuating lever 50 via the gear 24 and the contact portion 52 is separated from the cam surface 41 a. Prevent or inhibit

<Function>
The operation of the timepiece 1 configured as described above will be described below. First, for example, with the contact portion 52 of the day operation lever 50 in contact with the cam surface 41 a of (4), the arc surface 32 of the driving missing member 34 engages with the concave 42 of the driven missing member 44 When it is in contact (in two places), the day hand 22 stops by designating the character 21a of "W" shown in FIG. In this state, since the arc surface 32 is engaged with the concave surface 42, the actuating cam wheel 40 does not rotate, the day actuating lever 50 does not move, and the day hand 22 indicates the letter 21a of "W" maintain.

  Here, temporarily, there is some play between the arc surface 32 of the driving missing member 34 and the concave surface 42 of the driven missing member 44, and the operating cam wheel 40 rotates in a slight angle range according to the play. Even when moving, since the cam surface 41a of the operating cam 41 forms a dead zone with respect to the day operating lever 50 in the range of the above (4), the day operating lever 50 does not move. The day hand 22 maintains the state in which the character 21a of "W" is designated.

  In this state, since the drive wheel jumper 60 exerts on the drive lever 50 the torque for rotating the drive lever 50 clockwise through the gear 24 of the drive wheel 23, the contact portion 52 is a cam surface I will never leave 41a. Also, a load according to the torque of the day actuation lever 50 acts from the contact portion 52 on the cam surface 41a, and the actuation cam wheel 40 receives torque rotating by this load acting on the cam surface 41a. The engagement between the arc surface 32 of the member 34 and the concave surface 42 of the driven toothless member 44 keeps the actuating cam wheel 40 stopped.

  From this state, when a push button provided on the timepiece 1 is pressed or the like to input an operation to change the day of the calendar, the control IC provided on the movement 3 receives the input. The control IC outputs a command for driving the step motor in order to turn the day hand 22 clockwise in FIG. 1 in response to the input of the received operation. The step motor rotates the rotor of the step motor by a predetermined number of rotations in accordance with the drive command. The predetermined number of rotations is set by the control IC in accordance with the time during which the push button or the like is pressed.

  The day of the calendar may of course be changed by a command from the control IC based on, for example, the clocking of around 24 o'clock when the date changes. In this case, although an external operation such as a push button is not input, the control IC detects that a predetermined time has come, and instructs the step motor to drive the day hand 22 clockwise. Output The step motor rotates the rotor by a predetermined number of revolutions according to the drive command. The predetermined number of rotations corresponds to an angle at which the day hand 22 is rotated by one of the characters 21a.

  When the rotor rotates, the drive wheel train meshed with the rotor is rotated, and the turning wheel 30 is continuously rotated counterclockwise around the center C1. Then, as shown in FIG. 6, the arc surface 32 of the driving missing member 34 of the turning wheel 30 starts to come off the concave surface 42 of the driven missing member 44, and the teeth 33 a protruding from the arc surface 32 start Start pushing. Thus, the operating cam wheel 40 including the driven toothless member 44 starts to rotate clockwise around the center C2.

  When the rotor further rotates, as shown in FIG. 7, the teeth 33 a of the driving missing member 34 and the teeth 43 a of the driven missing member 44 mesh with each other, and the actuating cam wheel 40 rotates according to the turning wheel 30.

  When the actuating cam wheel 40 is rotated and the contact portion 52 of the day actuating lever 50 comes into contact with the cam surface 41 a in the range shown in (11) above, the contact of the day actuating lever 50 is performed as the actuating cam wheel 40 rotates. The part 52 is displaced in the direction away from the axial center C2. As a result, the day operating lever 50 pivots around the center C3 against the biasing force (elastic force) by the day driving jumper 60, and the day wheel 23 engaged with the teeth 51 of the day operating lever 50 has the center C5. Rotate clockwise around. By the rotation of the day wheel 23, the day hand 22 starts moving from the state where it is pointing to the character 21a of "W" to the character 21a of the next "T" (Thursday).

  By rotation of the rotor, as shown in FIG. 9, the teeth 33a move away from the teeth 43a, and when the arc surface 32 engages with the concave surface 42 in the same manner as shown in FIG. The rotation of the actuating cam wheel 40 is stopped. At this time, the contact portion 52 of the day operation lever 50 comes into contact with the cam surface 41 a in the range shown in the above (5) and stops, and the day hand 22 points to the character 21 a of “T” (Thursday) Stop at

  Repeating the above operation, the day hand 22 is in a state of pointing to the character 21a of "S" (Saturday), and further, the contact portion 52 of the day operation lever 50 is moved from the cam surface 41a to the above (13) to (1). When moving, the day operation lever 50 instantaneously pivots clockwise around the center C3, and the day hand 22 begins to point to the letter 21a of "S" (Saturday) "S" (Sunday) It moves instantaneously (flyback) to the state which points to the character 21a.

  According to the timepiece 1 of the present embodiment configured as described above, the stepper motor is continuously driven by the toothless mechanism including the driving toothless member 34 of the turning wheel 30 and the driven toothless member 44 of the operation cam wheel 40. The continuous rotation of the rotary wheel 30, i.e., can be converted into the intermittent rotation of the operating cam wheel 40.

  In the tooth loss mechanism, the convex portion of the arc surface 32 protrudes into a concave space formed between two places where the arc surface 32 of the driving tooth loss member 34 contacts the concave surface 42 of the driven tooth loss member 44. Therefore, in the state where the driven tooth missing member 44 is stopped, the driven tooth missing member 44 is reliably held in the stopped state. Therefore, even if a torque that causes the actuating cam wheel 40 to rotate from the actuating lever 50 to the actuating cam wheel 40 due to the elastic force of the day wheel jumper 60, this torque prevents or suppresses the actuating cam wheel 40 from rotating. It is not necessary to separately provide a cam jumper (protrusion member) to be engaged with the operating cam wheel 40 in order to do this.

  Therefore, the timepiece 1 according to the present embodiment does not have the cam jumper engaged with the actuating cam wheel 40, and thus the step motor for driving the turning wheel 30 as compared with the timepiece provided with the cam jumper engaged with the actuating cam wheel 40. Torque can be reduced. As a result, the reduction gear ratio of the drive wheel train can be reduced.

  Further, the timepiece 1 according to the present embodiment can reduce the number of components by providing no cam jumper, as compared with the case where the cam jumper is provided. Therefore, in the movement 3 of the timepiece 1, the arrangement space of the parts is increased as compared with the case in which the cam jumper is provided, and the restriction of the arrangement of the parts can also be alleviated.

  Moreover, the timepiece 1 of this embodiment can also reduce the diameter of the gear of a driving wheel train by the structure which does not provide a cam jumper.

  In addition, the actuating cam wheel 40 receiving torque from the day actuating lever 50 does not have a jumper that prevents the actuating cam wheel 40 from rotating in reverse, in order to maintain a stopped state by the tooth missing mechanism. , And the retrograde display mechanism 70 can be properly operated.

  Further, in the timepiece 1 of the present embodiment, the actuating cam wheel 40 has the driven toothless member 44, and the turning wheel 30 has the driving toothless member 34. These driving toothless member 34 and the driven toothless member 44 Thus, by configuring the tooth-loss mechanism that intermittently rotates the operation cam wheel 40, it is not necessary to separately provide a tooth-loss mechanism in addition to the operation cam wheel 40 and the turning wheel 30. Therefore, the number of components of the watch having the retrograde display mechanism can be reduced.

  Further, in the timepiece 1 of the present embodiment, five teeth 33 a are formed on the teeth 43 of the driving missing member 34, and four teeth 43 a meshing with the five teeth 33 a are located on the teeth 43 of the driven missing tooth 44. Since it is formed, the driving torque can be distributed to the five teeth 33a in order to rotate the actuating cam wheel 40 1/7 to send the day hand 22 by one of the characters 21a of the day of the week. Therefore, the load fluctuation during one rotation of the turning wheel 30 can be reduced as compared with the case where the actuating cam wheel 40 is rotated 1/7 with only one tooth 33a. Therefore, the torque of the step motor which drives the turning wheel 30 can be reduced.

  Further, in the timepiece 1 of the present embodiment, the cam surface 41a has a plurality of operating areas (angular ranges B, D, and so on) formed by increasing the radius from the axial center C2 corresponding to the rotational angle around the axial center C2. F, H, J, L) and a non-operating region (angular range A, having a constant radius from the center C2 regardless of the rotation angle around the center C2 formed between two adjacent operating regions) C, E, G, I, K, M). Since the day actuating lever 50 does not rotate in the inoperative region, the watch 1 according to the present embodiment has some rattling between the arc surface 32 of the driving missing member 34 and the concave surface 42 of the driven missing member 44. Even if the actuating cam wheel 40 rotates a little, it is possible to prevent the day needle 22 from moving unintentionally (intentionally) without actuating the actuating lever 50 in contact with the inoperative area.

  FIG. 10 is an enlarged view of a portion where the projecting portion 35 is formed on the arc surface 32 of the driving missing member 34, but the arc surface 32 and the concave surface 42 of the driven missing tooth member 44 are in contact. FIG. 12 is an enlarged view showing a state in which (the protrusion 35 is present) separates from the concave surface 42. FIG. 12 is a portion where the arc surface 32 (without the protrusion) of the driving missing member 34 contacts the concave 42 of the driven missing tooth 44. FIG. 13 is an enlarged view showing a state where the circular arc surface 32 (without the protrusion) is separated from the concave surface 42. FIG.

  In the timepiece 1 of the present embodiment, the arc surface 32 of the driving missing member 34 engaged with the concave surface 42 of the driven missing member 44 is a perfect perfect circular arc surface. As shown, it is preferable that a part of the arc surface 32 be formed with a projecting portion 35 that protrudes outward in the radial direction from the axial center C1 than the arc of the arc surface 32. The projecting portion 35 is formed between the two contacting portions in a state where the arc surface 32 is in contact with the concave surface 42 at two points, and the projection length from the arc surface 32 is the concave surface It needs to be a length that does not hit 42.

  Further, among the two portions where the concave portion 42 contacts the arc surface 32, in the protrusion 35, one contact portion on the upstream side (rear side) in the rotational direction of the driving missing member 34 separates from the arc surface. After that, it is preferable that one contact portion on the downstream side (front side) in the rotational direction of the motive missing member 34 be formed at a position corresponding to the timing of riding up.

  According to the toothless mechanism in which such a projecting portion 35 is formed on the circular arc surface 32, as shown in FIG. 10, the circular arc surface 32 of the driving toothless member 34 and the concave surface 42 of the driven toothless member 44 engage. When the protrusion portion 35 is separated from the concave surface 42 as shown in FIG. 11 from the above state, the protrusion portion 35 is in contact with the arc surface 32, and the end portion of the concave surface 42 is in contact. Is pushed forward in the direction of rotation. The driven toothless member 44 pushed forward in the rotational direction slightly rotates about the center C2.

  By this slight rotation, the point at which the tooth 33a comes into contact with the concave surface 42 from the axial center C1 of the driving missing member 34 when the tooth 33a subsequently hits the side surface of the concave surface 42 and pushes the concave surface 42 in the rotational direction. The length up to (contact point) P is r1.

  On the other hand, in the case shown in FIG. 12 in which the projecting portion 35 is not formed on the arc surface 32, as shown in FIG. The toothless member 44 does not rotate. In this case, the point at which the tooth 33a comes in contact with the concave surface 42 from the axial center C1 of the driving missing tooth member 34 when the tooth 33a subsequently hits the side surface of the concave surface 42 and pushes the concave surface 42 in the rotational direction Assuming that the length to Q) is r2, the length r1 from the axis C1 to the contact point P is shorter than the length r2 from the axis C1 to the contact point Q.

  That is, in the case where the projecting portion 35 is formed on the arc surface 32, the contact point when the driven missing tooth member 34 causes the driven missing tooth member 44 to rotate can be close to the axial center C1 of the driven missing tooth member 34. Thereby, the torque of the step motor which drives the turning wheel 30 can be reduced.

  In the watch 1 of the present embodiment, the retrograde display mechanism 70 causes the day hand 22 to perform retrograde operation, but the watch having the retrograde display mechanism according to the present invention is not limited to the retrograde operation of the day hand. A day hand other than a day hand (a pointer that displays a number of numbers indicating the date side by side and indicates one of the numbers), a date indicator, a plurality of characters indicating a month (1 to 12) Pointers that are displayed side by side and indicate any of the characters), moon wheel, city indicator hand (a pointer that displays a plurality of characters indicating the city name in the circumferential direction, and that indicates any of the characters) The present invention is similarly applicable to a timepiece having a retrograde display mechanism having display hands or display cars displaying various information such as a city display car, a moon phase, etc.

DESCRIPTION OF SYMBOLS 1 day date electronic timepiece 20 day display part 23 day wheel 30 turn wheel 34 driving missing tooth member 40 operating cam wheel 41 operating cam 41 a cam surface 44 driven missing tooth member 50 day operating lever 60 day car jumper 70 retrograde display mechanism

Claims (4)

A motor that rotates continuously,
A driven vehicle formed with a retrograde operating cam, which engages with the driving vehicle;
A cam lever whose posture changes in accordance with a change in the contact position on the cam surface, being in contact with the cam surface of the retrograde operation cam;
A display unit that operates retrograde according to the attitude of the cam lever;
A jump control member for biasing the cam lever in a direction to press the cam surface;
And a driven toothless member and a driven toothless member engaged with each other as a toothless mechanism for converting continuous rotation of the driving wheel to intermittent rotation of the driven vehicle,
The motive motor has the motive-force missing member.
The timepiece according to the present invention includes a retrograde display mechanism having the driven toothless member at a position different from the retrograde operation cam in the axial center direction of the driven vehicle. The driving missing tooth member has a tooth portion that meshes with the driven missing tooth member to rotate the driven missing tooth member,
The timepiece provided with a retrograde display mechanism according to claim 1, wherein the tooth portion protrudes in the radial direction more than a portion other than the tooth portion of the driving missing tooth member. The driven toothless member has a concave surface and a tooth formed radially inward of the concave surface,
The driving missing member has a circular arc surface which is convex outward, and a tooth portion which protrudes outward in the radial direction with respect to the circular arc surface.
The timepiece provided with the retrograde display mechanism according to claim 1 or 2, wherein the circular arc surface has a protrusion projecting outward in a radial direction of the circular arc of the circular arc surface.   The cam surface is formed between a plurality of adjacent operating regions and a plurality of operating regions formed by increasing the radius from the rotation center corresponding to the rotation angle around the rotation center. The timepiece provided with the retrograde display mechanism according to any one of claims 1 to 3, having an inoperative area having a constant radius from the rotation center regardless of the rotation angle around the center.