JP2015148546A - Energization structure of pointer wheel for clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an energization structure of a pointer wheel for a clock capable of accurately keeping the rotation of the pointer wheel by preventing the deformation of a press spring part formed integrally with the pointer wheel such as an hour hand wheel.SOLUTION: In the energization structure of a pointer wheel for a clock, a press spring part is formed integrally with an hour hand wheel 5, and an annular step part on which a slide part existing at the tip of the press spring part abuts and slides is disposed in a third case 3. Thus, the press spring part slides in a state in which the annular step part regulates a radial movement. Therefore, the deformation of the press spring part can be prevented, and the rotation of the hour hand wheel 5 can be accurately kept for a long term.

Description

  The present invention relates to an urging structure for a timepiece hand wheel for urging a hand wheel to which a hand is attached in an axial direction, and more particularly to a hand wheel for a radio wave timepiece that automatically corrects time by obtaining a time signal by radio waves. This relates to the biasing structure.

  Conventionally, in timepieces that display a pointer, a metal presser spring made of a washer provided with a spring is used to suppress the movement of the pointer and perform stable hand movement, such as a second hand wheel or hour hand wheel that drives the pointer. It was arranged coaxially with the gear. This presser spring is pressed by urging the gear in the axial direction due to its spring property, eliminating play of the hour hand wheel and the like and stabilizing the hand movement.

  In addition, in order to reduce the number of parts and the cost, there is a structure in which the presser spring is formed integrally with a gear such as a second hand wheel (see, for example, Patent Document 1, FIG. 4, Patent Document 2, and FIG. 8).

  Further, in a timepiece that automatically corrects the time based on the time signal, it has been proposed to form the presser spring integrally with the second hand wheel as described above (see Patent Document 3, FIG. 6, and FIG. 7).

Japanese Utility Model Publication No. 3-99389 Utility Model Registration No. 2594493 Japanese Patent No. 3625253

  In a timepiece that automatically corrects the time, not only the gear of the second hand wheel and the presser spring are integrally formed as in the above-described prior art, but also a through hole or the like that is drilled to form the presser spring portion is indicated as a pointer. It was considered desirable to use it for position detection as well. However, currently used gears are made of plastic, and there is a possibility that the presser spring portion formed in a part thereof is deformed. When the presser spring portion is deformed in this manner, the position of the pointer position detection portion changes, and there is a problem that the pointer position cannot be detected accurately.

  The problem to be solved by the present invention is to solve the above-mentioned problems of the prior art, prevent deformation of the presser spring portion formed integrally with the pointer wheel such as an hour hand wheel, and maintain the rotation of the pointer wheel with high accuracy. An object is to provide an urging structure for a pointer wheel for a watch.

  An urging structure for a timepiece wheel according to the present invention is an urging structure for a timepiece wheel that urges an indicator wheel that is attached to a case and faces the case in an axial direction, and is applied to the case of the pointer wheel. A plurality of presser spring portions having a tongue-shaped piece integral with the pointer wheel protruding in an arc shape in a through hole provided in a facing portion, and having a sliding portion at the released tip, An annular step portion provided at a portion facing the presser spring portion and in contact with the sliding portion to urge the pointer wheel in the axial direction.

  Further, the sliding portion in the urging structure of the timepiece wheel for a watch is provided with a convex portion, and the convex portion circulates in the annular step portion in a state where movement in the radial direction is restricted by the annular step portion. It slides in the direction. In addition, a plurality of the through holes are provided in the urging structure of the timepiece hand wheel, and a position detection unit for detecting the position of the hands is formed by the through holes.

  In the urging structure of the timepiece hand wheel of the present invention, the presser spring portion is formed integrally with the handwheel, and an annular step portion is provided on the case to which the sliding portion at the tip of the presser spring portion comes into contact and slides. Therefore, the presser spring portion slides in a state where movement in the radial direction is restricted by the annular step portion. Therefore, deformation of the presser spring portion can be prevented, and the rotation of the pointer wheel can be accurately maintained over a long period.

  In addition, when used in a radio-controlled timepiece that detects the position of the pointer from the pointer wheel when the time is automatically corrected, it is possible to keep the rotation of the pointer wheel accurately by preventing deformation of the presser spring as described above. Even if a through hole or the like formed in the pointer wheel is used to detect the pointer position, the detection accuracy does not decrease. Accordingly, it is not necessary to provide a hole or the like in the pointer wheel or the like exclusively for detecting the pointer position.

It is principal part sectional drawing of the movement for radio timepieces which shows the urging | biasing structure of the pointer wheel for timepieces which concerns on one Embodiment of this invention. It is a front view of the pointer wheel shown in FIG. It is sectional drawing of the pointer wheel shown in FIG. FIG. 3 is a rear view of the pointer wheel shown in FIG. 2. It is a rear view of the 3rd case shown in FIG. It is sectional drawing of the 3rd case shown in FIG. It is a principal part expanded sectional view which shows the urging | biasing structure part of the hour hand wheel shown in FIG.

  In the radio timepiece movement shown in FIG. 1, the case 4 includes a first case 1 that covers the pointer driving mechanism from the back side of the watch, and an intermediate plate that supports the pointer driving mechanism from the back side of the watch in the first case 1. And a third case 3 such as a lower plate that supports the pointer driving mechanism from the front side of the watch.

  The pointer wheel in the pointer drive mechanism in the present embodiment includes an hour hand wheel 5, a minute hand wheel 6, and a second hand wheel 7, and in this embodiment, a presser spring portion 5b for urging these pointer wheels in the axial direction is provided as an hour hand. It is provided in the car 5. That is, as shown in FIGS. 2 to 4, three substantially arc-shaped through holes 5 a are formed at a predetermined interval in the portion of the hour hand wheel 5 that faces the third case 3. In the through-hole 5a, a tongue-shaped presser spring portion 5b that protrudes in an arc shape in the circumferential direction is provided. In the present embodiment, the presser spring portion 5b is positioned at the radially inner portion of the through hole 5a and the position detecting hole portion 5c of the through hole 5a is positioned at the radially outer side. Yes. The presser spring portion 5b has a released tip having a spring property in the axial direction, and a protruding portion 5d is provided on the sliding portion 5f at the tip so as to protrude toward the third case 3.

  As shown in FIGS. 1, 5, 6 and 7, the third case 3 supporting the hour hand wheel 5 has a sleeve-like through portion 3a through which the cylindrical shaft portion 5e of the hour hand wheel 5 is inserted. Is provided, and an annular step portion 3b is provided at the edge portion thereof. The annular step portion 3b is provided at a position facing the presser spring portion 5b of the hour hand wheel 5, an annular flat surface 3c facing the sliding portion 5f of the presser spring portion 5b, and a shaft from its radially outer end. It has an annular peripheral surface 3d that rises in the direction.

  In the present embodiment, a structure for urging the hour hand wheel 5 in the axial direction is configured by the presser spring portion 5 b of the hour hand wheel 5 having the above-described configuration and the annular step portion 3 b of the third case 3. The engaged state of the presser spring portion 5b and the annular step portion 3b and the mutual action are as follows. As shown in FIGS. 1 and 7, when a pointer driving mechanism such as the hour hand wheel 5 is incorporated in the case 4, the presser spring portion 5 b of the hour hand wheel 5 and the annular step portion 3 b of the third case 3 face each other. At this time, the convex portion 5d of the sliding portion 5f at the released tip of the presser spring portion 5b contacts the flat surface 3c of the annular step portion 3b, and presses the flat surface 3c with the elasticity of the presser spring portion 5b. The hour hand wheel 5 is biased in the axial direction by the reaction of the pressing force of the presser spring portion 5b at this time. When the hour hand wheel 5 rotates, the convex portion 5d of the presser spring portion 5b slides while pressing the flat surface 3c of the annular step portion 3b.

  If the presser spring portion 5b is deformed, the sliding portion 5f of the presser spring portion 5b is predicted to shift in the radial direction. In the case of this embodiment, since the presser spring portion 5b is arranged on the inner side in the radial direction, the deviation toward the inner side in the radial direction is extremely small, and the rotation of the hour hand wheel 5 is hardly affected. However, since the position detecting hole 5c of the through-hole 5a is provided on the radially outer side, the displacement toward the radially outer side becomes large. Therefore, in this embodiment, even if the presser spring portion 5b is deformed and the sliding portion 5f tries to move outward in the radial direction, the sliding portion 5f or the convex portion 5d of the presser spring portion 5b is the peripheral surface of the annular step portion 3b. Since it abuts against 3d, the movement of the presser spring portion 5b to the outside in the radial direction is restricted, and the accuracy of rotation and urging of the hour hand wheel 5 can be maintained. In addition, by restricting the movement of the presser spring portion 5b in the radial direction in this way, it is possible to prevent the presser spring portion 5b from being deformed. In particular, it is effective in preventing deformation after manufacturing and deformation due to centrifugal force accompanying high-speed rotation when detecting the position of the pointer.

  The detection of the pointer position using the hour hand wheel 5 of the present embodiment is performed as follows. As shown in FIG. 1, a circuit board 10 on which a light emitting element 8 such as an LED and a light receiving element 9 such as a phototransistor are mounted is attached to the third case 3, and the light emitting element 8 and the light receiving element 9 are mounted. The light guide 11 is attached to the first case 1 so as to oppose the first case 1. Between the light emitting element 8 and the light guide 11, an hour hand wheel 5, a minute hand wheel 6, a second hand wheel 7, and the like are located, and through holes 5a, 6a, and 7a are respectively provided. The light emitted from the light emitting element 8 is set to pass through the through holes 5 a, 6 a, and 7 a, guided by the light guide 11, and irradiated to the light receiving element 9. Further, as shown in FIG. 2, a position detecting light-shielding portion 5g having a wide and narrow predetermined width is provided between the position detecting holes 5c of the through holes 5a. The position detection is performed by the position detection hole 5c and the position detection light-shielding part 5g serving as a position detection unit.

  The light emitted from the light emitting element 8 passes through the through holes 5a, 6a and 7a to reach the light guide 11, and is guided by the light guide 11 to reach the light receiving element 9, and the rotation of the hour hand wheel 5. May be blocked by the position detection light-shielding portion 5g. Thus, the position of the hour hand attached to the hour hand wheel 5 is detected from the on / off intervals when the light reaches the light receiving element 9 and when it is blocked. The position of the minute hand wheel 6 and the second hand wheel 7 can be similarly detected.

  In the present embodiment, as described above, since the position of the through hole 5a does not shift due to the deformation of the presser spring portion 5b, the hour hand wheel 5 has a through hole 5a for forming the presser spring portion 5b of the hour hand wheel 5. A part of the position detection hole 5c can be used for detection of the pointer position, and there is no need to provide another hole for detecting the pointer position. In particular, in the case where another hole for detecting the pointer position is provided, it is necessary to provide it in a place where it does not deform, and the structure is enlarged, for example, by securing a place where the gear is not enlarged and deformed. For this reason, size reduction can be achieved by using a part of the through hole 5a as the position detection hole 5c.

  In this embodiment, the hour hand wheel 5 is provided with the presser spring portion 5b and the third case 3 is provided with the annular step portion 3b. However, the second hand wheel 7 is provided with the presser spring portion, and the frame 12 in the case 4 or the like. It is also possible to form an annular step.

DESCRIPTION OF SYMBOLS 1 1st case 2 2nd case 3 3rd case 3a Through-hole part 3b Annular step part 3c Plane 3d Circumferential surface 4 Case 5 Hour hand wheel 5a Through hole 5b Pressing spring part 5c Position detection hole part 5d Projection part 5e Axis Part 5f Sliding part 5g Position detecting light shielding part 6 Minute hand wheel 6a Through hole 7 Second hand wheel 7a Through hole 8 Light emitting element 9 Light receiving element 10 Circuit board 11 Light guide body 12 Frame

Claims (3)

An urging structure for a timepiece indicating wheel for urging an indicator wheel attached to the case and facing the case in an axial direction;
A plurality of pressers having a tongue-like piece integral with the pointer wheel protruding in an arc shape in a through hole provided in a portion facing the case in the pointer wheel, and having a sliding portion at the released tip. A spring part,
An annular step portion provided at a portion facing the presser spring portion in the case and in contact with the sliding portion to urge the pointer wheel in the axial direction;
An urging structure for a watch indicating wheel characterized by comprising: The timepiece according to claim 1, wherein the sliding portion is provided with a convex portion, and the convex portion slides in the circumferential direction in the annular step portion in a state where movement in a radial direction is restricted by the annular step portion. The urging structure of the pointer wheel. The urging structure for a timepiece hand wheel according to claim 2, wherein a plurality of the through holes are provided, and a position detection unit for detecting a hand position is formed by the through holes.

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