JP2015166717A - Timepiece display mechanism, timepiece movement and timepiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To return an indication unit to an initial position by continuous hand operation, while controlling reset-to-zero speed.SOLUTION: There is provided a time display mechanism 24 including an indication unit 40 rotating based on an initial position, a display 14 for displaying time information based on rotation of the indication unit, a restoration part 41 for restoring the indication unit to the initial position based on end instruction of display of the time information, and a rotation suppression part 42 for suppressing rotation speed of the indication unit until the indication unit is restored to the initial position.

Description

  The present invention relates to a timepiece display mechanism, a timepiece movement, and a timepiece.

  Conventionally, many watches equipped with a chronograph mechanism are known (see, for example, Patent Document 1). In the chronograph mechanism, the zero return structure for returning the chronograph hands to the initial position (zero position) is generally intermittent using the mechanical zero return method of hitting the heart cam and the rotational force of the motor. It is roughly divided into two methods, that is, a motor zeroing method for returning by hand movement.

Japanese Patent No. 5341494

In the case of the mechanical zero return method, the heart cam that is press-fitted into the chronograph shaft to which the chronograph needle is attached is struck back, so that the chronograph hand can be rotated at high speed and the return is instantaneous. There is an advantage that zero can be done.
However, since the chronograph hands return instantaneously, an excessive load (impact force) is likely to act on the chronograph hands at the start of return to zero or at the end of return to zero, and the chronograph hands may be deformed. There is. Therefore, it is necessary to design the chronograph hands in consideration of the load, and there is a problem that the size and shape of the chronograph hands are restricted.
In addition, since an excessive load is applied to the fastening portion between the chronograph needle and the chronograph shaft, the chronograph needle is easily loosened. Therefore, in order to prevent this loosening, there are measures such as increasing the fastening torque by forming the press-fitting portion of the chronograph needle on the chronograph shaft into a special shape, for example, a quadrilateral shape in cross section. There was a problem that was necessary and that would still cause restrictions.

  On the other hand, in the case of the motor nulling method, the rotation of the motor is used to nullify the chronograph hands, so the nulling speed is slower than the mechanical nulling method and the chronograph can be restarted smoothly. It was difficult to do. In addition, the chronograph hands return with an intermittent hand movement, so they do not look good and have room for improvement. Furthermore, there are cases where the zero return speed differs depending on whether the motor is rotating forward or backward, and there is room for improvement.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a time display mechanism that can return the indication unit to the initial position by continuous hand movement while controlling the zero return speed. It is to provide a watch movement and a watch.

(1) The time display mechanism according to the present invention is based on an instruction unit that rotates with reference to an initial position, a display unit that displays time information based on the rotation of the instruction unit, and an instruction to end display of the time information. A return unit that returns the indication unit to the initial position, and a rotation suppression unit that suppresses the rotation speed of the indication unit until the indication unit returns to the initial position. And

According to the time display mechanism, the time information is displayed based on the rotation of the instruction unit that rotates with the display unit as a reference, so that, for example, time measurement can be accurately performed. Then, in order to stop the time measurement, when an instruction to end the display of time information is issued, the return unit returns the indication unit to the initial position (returns to zero). Thereby, the positions of the instruction unit and the display unit can be reset to the original positions, and can be prepared for the next time measurement.
By the way, the rotation suppression unit suppresses the rotation speed of the instruction unit until the instruction unit is returned to the initial position by the return unit. As a result, it is possible to control the return zero speed of the instruction unit, and it is possible not to instantaneously return the instruction unit to the initial position but to return it while continuously operating the desired zero return speed.

  Therefore, it is possible to prevent an excessive load from acting on the instruction unit and the display unit, and it is possible to eliminate design restrictions in consideration of the load. In addition, since the instruction unit and the display unit can be returned while continuously moving at a desired return zero speed, it is possible to quickly prepare for the next time display (time measurement), The appearance of the movement of the display section can be improved and the design can be improved.

(2) The return unit rotates with the rotation of the instruction unit, rotates with the rotation of the instruction unit, and is forcibly rotated based on the end instruction, so that the initial position A heart cam positioned at a specified position associated with the heart cam, and elastically deforming along with the forced rotation of the heart cam, and rotating the first rotating body to follow the forced rotation of the heart cam by restoring deformation, And an elastic body that returns the indication unit to the initial position.

In this case, when the indicating unit rotates with the initial position as a reference, the first rotating body and the heart cam rotate together with the indicating unit. Here, when an instruction to end the display of time information is issued, the heart cam is forcibly rotated, for example, by being hit, and positioned at a specified position. At this time, since the elastic body is elastically deformed with the forced rotation of the heart cam, the heart cam can be rotated in advance. When the heart cam is positioned at the specified position, the elastic body is restored and deformed, and the first rotating body is rotated with a delay so as to follow the forced rotation of the heart cam. Thereby, the positions of the instruction unit and the display unit can be reset to the original positions.
In this manner, the heart cam is forcibly rotated first, and then the indicating unit is returned to zero using the restoring deformation by the elastic body, so that it can be reset with smoother continuous hand movement.

(3) The elastic body is wound so as to have an initial elastic force, an outer end portion is connected to the first rotating body, and an inner end portion is connected to the heart cam or a train wheel connected to the heart cam. A hairspring can be used.

  In this case, since the bending deformation of the hairspring can be used, it is possible to return the indicating unit with high accuracy over a long period of time and to improve the reliability.

(4) The hairspring may include a first hairspring and a second hairspring wound in a direction opposite to the first hairspring.

  In this case, since the first and second hairsprings whose winding directions are opposite to each other are used, at the time of restoration deformation, one of the hairsprings is elastically deformed to reduce the diameter, and the other hairspring is The mainspring can be elastically deformed to expand its diameter. As described above, since the first and second springs having opposite directions of restoration deformation can be used, the indicating unit can be more stably and quickly stopped with respect to the initial position, and the indicating unit can be returned more precisely. Can be made.

(5) The rotation suppressing unit may include a second rotating body that rotates in accordance with the rotation of the instruction unit, and a resistor that provides rotational resistance to the second rotating body.

  In this case, the resistor provides rotational resistance to the second rotating body, thereby suppressing the rotation speed of the indicating unit. Therefore, adjusting the resistor controls the nulling speed of the indicating unit. It becomes possible. Therefore, the zero return speed can be easily controlled, the movement (behavior) of the instruction unit and the display unit at the time of return zero can be freely designed, and the design can be improved.

(6) The resistor may provide a rotational resistance proportional to the angular velocity of the second rotating body.

  In this case, since the resistor gives a rotational resistance proportional to the angular velocity of the second rotator, for example, after the return zero speed of the indicating unit is once increased, it is returned to the initial position while gradually decelerating. It is possible to add a change in zero speed. Accordingly, the movement of the instruction unit and the display unit at the time of returning to zero can be given a unique change different from the conventional one, and the design can be further improved and the added value can be increased.

(7) A timepiece movement according to the present invention includes the timepiece display mechanism.

  According to the timepiece movement, since the timepiece display mechanism described above is provided, it is possible to obtain a high-quality timepiece movement with no design restrictions and excellent operation performance.

(8) A timepiece according to the present invention includes the timepiece movement described above.

  According to the above-described timepiece, since the timepiece movement described above is provided, a high-quality timepiece having excellent operational performance can be obtained. In particular, it is suitable for a quartz watch having a chronograph mechanism.

  According to the present invention, it is possible to return the indication unit to the initial position by continuous hand movement while controlling the zero return speed.

It is a figure which shows 1st Embodiment which concerns on this invention, Comprising: It is an external view of a timepiece. It is a fragmentary sectional view of the movement shown in FIG. It is a top view which shows the relationship between the chronograph axis | shaft shown in FIG. 2, a transmission gearwheel, a heart cam, a hairspring, an oil rotor, and a hammer. FIG. 4 is a plan view showing a state in which the heart cam is positioned at a specified position using the hammer in the state shown in FIG. 3 and the chronograph shaft is reset to the initial position. It is a top view of the 1st hairspring shown in FIG. It is a top view of the 2nd hairspring shown in FIG. FIG. 4 is a plan view showing a state in which the hammer is actuated to apply an external force to the heart cam from the state shown in FIG. 3. FIG. 8 is a plan view showing a state in which the heart cam is positioned at a specified position using a hammer in the state shown in FIG. 7. It is a schematic plan view of the chronograph mechanism which shows 2nd Embodiment based on this invention. It is sectional drawing of the chronograph mechanism along the AA line shown in FIG. It is a schematic plan view which shows the modification of the chronograph mechanism of 2nd Embodiment. It is sectional drawing of the chronograph mechanism along the BB line shown in FIG. It is a schematic sectional drawing of the chronograph mechanism which shows 3rd Embodiment based on this invention. It is a top view which shows the relationship between the chronograph axis | shaft shown in FIG. 13, a transmission gear, a heart cam, an operating lever, an operating lever spring, an oil rotor, and a hammer. FIG. 15 is a plan view showing a state in which the heart cam is positioned at a specified position using a hammer in the state shown in FIG. 14. FIG. 16 is a plan view showing a state where the chronograph axis is reset to the initial position from the state shown in FIG. 15. It is a schematic sectional drawing which shows the modification of the chronograph mechanism which concerns on this invention. FIG. 18 is a plan view showing a relationship among a chronograph shaft, a transmission gear, a heart cam, an operating lever, an operating lever spring, a rotor, a spiral spring, and a hammer as shown in FIG. 17.

(First embodiment)
Hereinafter, a first embodiment according to the present invention will be described with reference to the drawings. In this embodiment, a quartz wristwatch (electronic timepiece) having a chronograph mechanism will be described as an example of a timepiece.

(Clock structure)
In general, a machine body including a driving part of a timepiece is referred to as a “movement”. A state in which a dial and hands are attached to the movement, and put into a watch case to form a finished product, is referred to as “complete” of the watch. Of the two sides of the base plate constituting the watch substrate, the side of the watch case with the glass (the side with the dial) is referred to as the “back side” of the movement. Further, of the both sides of the main plate, the side of the watch case with the case back (the side opposite to the dial) is referred to as the “front side” of the movement.
In the present embodiment, the direction from the dial toward the case back cover is described as the upper side, and the opposite side is described as the lower side.

  As shown in FIGS. 1 and 2, the timepiece 1 according to the present embodiment includes a dial 11 having a scale or the like indicating at least time information in a timepiece case 3 including a case back cover and a glass 2 (not shown). , A movement (a movement for a timepiece according to the present invention) 10.

An hour hand 12 indicating the hour and a minute hand 13 indicating the minute are disposed between the dial 11 and the glass 2 as a pointer for performing a normal time display, and a chronograph second hand 14 used for time measurement. Is arranged. These hour hand 12, minute hand 13 and chronograph second hand 14 are arranged coaxially. Further, in the present embodiment, a second hand 15 is disposed at, for example, the 3 o'clock position of the dial 11 as a pointer for performing normal time display.
However, the second hand 15 is not essential and may not be provided, and if provided, the second hand 15 is not limited to being arranged at the 3 o'clock position, and may be arranged at a free position. Furthermore, not only the chronograph second hand 14, but also a chronograph minute hand and a chronograph hour hand used for time measurement may be provided.

(Configuration of watch movement)
As shown in FIG. 2, the movement 10 includes a main plate 20, a train wheel receiver 21 arranged on the front side of the main plate 20, and a chronograph receiver 22 arranged on the front side of the train wheel receiver 21. Yes.
On the back side of the main plate 20, the dial plate 11 is disposed so as to be visible through the glass 2. On the front side of the main plate 20, there are a battery (not shown), a train wheel mechanism 23 for performing normal time display, a chronograph mechanism (time display mechanism according to the present invention) 24 for performing time measurement, and a train wheel mechanism 23. A first step motor 25 shown in FIG. 1 for operating and a second step motor 26 shown in FIG. 1 for operating the chronograph mechanism 24 are disposed at least.

  As shown in FIG. 1, the first step motor 25 includes a coil block 25a including a coil wire wound around a magnetic core, a stator 25b arranged so as to contact both end portions of the magnetic core of the coil block 25a, and a rotor magnet. And an integrated rotor 25c. The rotor 25c is disposed in a rotor hole formed in the stator 25b, and is rotatably supported by the main plate 20 and the train wheel bridge 21.

In addition, on the front side of the ground plane 20, a circuit board (not shown) connected to the battery is disposed. On this circuit board, a crystal unit (not shown) having a crystal resonator that oscillates at a predetermined frequency and an integrated circuit (IC) (not shown) are mounted.
The integrated circuit is composed of, for example, a C-MOS or PLA, and an oscillation unit (oscillator) that outputs a reference signal based on the vibration of a crystal resonator, and a frequency divider (divider) that divides the reference signal of the oscillation unit. And a drive unit (driver) that outputs a motor drive signal based on the output signal of the frequency dividing unit. And the 1st step motor 25 is driven based on the motor drive signal output from the drive part.

  Similar to the first step motor 25, the second step motor 26 includes a coil block 26a, a stator 26b, and a rotor 26c. The rotor 26c of the second step motor 26 is controlled by a chronograph driving unit (not shown) that operates based on the operation of the start / stop button 27 of the chronograph. The chronograph drive unit outputs a motor drive signal to the rotor 26c of the second step motor 26 when the start / stop button 27 is pressed and the chronograph is operated, and the start / stop button 27 is pressed again. When the chronograph stops, the output of the motor drive signal is stopped. As a result, the rotor 26c of the second step motor 26 rotates only when the chronograph is operated.

In the illustrated example, the start / stop button 27 is attached to the watch case 3 so as to be arranged at the 2 o'clock position of the dial 11. However, the present invention is not limited to this case, and the position of the start / stop button 27 may be freely set.
Further, a reset button 28 for resetting the chronograph is attached to the watch case 3 so as to be arranged at, for example, the 4 o'clock position of the dial 11. By pressing the reset button 28, it is possible to issue an instruction to end the display of time information, and it is possible to return (return to zero) the chronograph shaft 40 described later to the initial position P1. The initial position P1 is a position at which the chronograph second hand 14 indicates 12:00 (see FIGS. 1 and 4).

  As shown in FIG. 2, on the front side of the main plate 20, a fifth wheel (not shown) that rotates based on the rotation of the rotor 25 c in the first step motor 25 and a fourth wheel that rotates based on the rotation of the fifth wheel. A car (not shown), a third wheel (not shown) that rotates based on the rotation of the fourth wheel, a second wheel 30 that rotates based on the rotation of the third wheel, and the rotation of the second wheel 30 A minute wheel (not shown) that rotates and a hour wheel 31 that rotates based on the rotation of the minute wheel are arranged. Each of these vehicles constitutes the wheel train mechanism 23 on the front side.

  The fifth wheel, the fourth wheel, and the third wheel are all supported rotatably with respect to the main plate 20 and the train wheel bridge 21. The lower tenon portion of the axle of the fourth wheel protrudes toward the glass 2 from the dial 11, and the second hand 15 shown in FIG. 1 is attached to the protruding portion.

  The center wheel & pinion 30 is formed in a cylindrical shape, is disposed coaxially with an axis O1 of a chronograph shaft 40 described later, and is rotatably supported by a cylindrical portion 32 formed integrally with the main plate 20. . Specifically, the center wheel & pinion 30 is partially disposed inside the cylindrical portion 32, and the upper end side is rotatably mounted on the upper opening end of the cylindrical portion 32. As a result, the center wheel & pinion 30 can rotate stably.

  In the illustrated example, the second wheel 30 is engaged with a third wheel (not shown) via the first relay wheel 33 and the second relay wheel 34. Further, the center wheel & pinion 30 is configured to rotate once per hour, and the minute hand 13 is attached to the lower end portion. At this time, the minute hand 13 is positioned closer to the dial 11 than the chronograph second hand 14 attached to the chronograph shaft 40.

The hour wheel 31 is disposed coaxially with the axis O1 of the chronograph shaft 40, and is integrally connected to the cylinder body 31a and the cylinder body 31a that is rotatably fitted to the cylinder portion 32, and is not shown. A cylindrical gear 31b that meshes with the minute wheel. However, the cylinder main body 31a and the cylinder gear 31b do not have to be configured separately, and may be formed integrally.
The hour wheel 31 is configured to rotate once every 12 hours, and the hour hand 12 is attached to the lower end of the cylinder body 31a. At this time, the hour hand 12 is located closer to the dial 11 than the minute hand 13.

  By the way, the minute wheel is configured to rotate via a not-illustrated pinion wheel or the like arranged on the front side of the main plate 20 when rotated in a state in which a winding stem (not illustrated) is pulled out. Thereby, the second wheel 30 and the hour wheel 31 can be rotated via the minute wheel, and the time can be adjusted.

On the front side of the main plate 20, a reset lever (not shown) having a function of resetting the operation of the integrated circuit when the time is adjusted and releasing the engagement between the third wheel and the second wheel 30 is disposed. Yes. Thus, when the winding stem is pulled out, the third wheel and the second wheel 30 are disengaged, and the fourth wheel with the second hand 15 does not rotate. Accordingly, by rotating the winding stem through the crown 35 shown in FIG. 1, only the second wheel 30 to which the minute hand 13 is attached and the hour wheel 31 to which the hour hand 12 is attached are rotated to set the time. It is possible to correct.
The fourth wheel meshes with the rotor 25c of the first step motor 25 via the fifth wheel, but the rotor magnet has a force (index torque) to stay in place, so that the rotation There is nothing to do.

(Chronograph mechanism)
The chronograph mechanism 24 displays a measurement time (seconds) which is time information based on the rotation of the chronograph shaft (instruction unit according to the present invention) 40 rotating with respect to the initial position P1 and the chronograph shaft 40. A graph second hand (display unit) 14, a return unit 41 for returning the chronograph shaft 40 to the initial position P1 based on a chronograph reset instruction (time information display end instruction), and the chronograph shaft 40 at the initial position P1. A rotation suppression unit 42 that suppresses the rotation speed of the chronograph shaft 40 is provided until returning.

  The chronograph shaft 40 is an axle that rotates around the axis O1 based on a chronograph start instruction. An upper tenon portion 40a is formed at an upper end portion, and the chronograph second hand 14 is attached to a lower end portion. The lower end portion of the chronograph shaft 40 projects downward from the lower end portion of the center wheel & pinion 30. Therefore, the chronograph second hand 14 is disposed closer to the glass 2 than the minute hand 13.

The chronograph shaft 40 in the illustrated example has a first enlarged diameter portion 40b, a second enlarged diameter portion 40c, a third enlarged diameter portion 40d, a flange portion 40e, and a fourth enlarged diameter portion in order from the upper tenon portion 40a toward the lower end portion. The multi-stage shaft is provided with a continuous portion 40f.
The first enlarged diameter portion 40b is a portion whose diameter is larger than that of the upper tenon portion 40a, and a transmission gear 50 described later is fixed to this portion by, for example, press fitting. The second enlarged diameter portion 40c is a portion having a diameter larger than that of the first enlarged diameter portion 40b, and a heart cam 51 (to be described later) is rotatably fitted to the chronograph shaft 40 in this portion. The third enlarged diameter portion 40d is a portion whose diameter is larger than that of the second enlarged diameter portion 40c, and a chronograph gear 45 is rotatably fitted to the chronograph shaft 40 in this portion. The flange portion 40e is a portion further expanded in diameter than the third expanded diameter portion 40d, and the inner edge portion of the chronograph spring 46 is in pressure contact. The fourth enlarged diameter portion 40f is a portion that is smaller in diameter than the flange portion 40e and larger in diameter than the third enlarged diameter portion 40d.

  The chronograph shaft 40 configured in this manner is located on the upper open end of the center wheel & pinion 30 with the portion positioned below the fourth enlarged diameter portion 40f being disposed inside the center wheel & pinion 30. The fourth enlarged diameter portion 40f is rotatably mounted. The upper tenon portion 40 a of the chronograph shaft 40 is pivotally supported by a bearing 22 </ b> A provided on the chronograph receiver 22. As a result, the chronograph wheel can be stably rotated about the axis O1.

The chronograph gear 45 is formed with teeth on the entire outer edge thereof, and is rotated by the rotational force transmitted from the rotor 26c in the second step motor 26, and the inner edge of the gear main body 45a. And an annular bushing 45b fixed by press-fitting, for example, and is rotatably fitted to the third enlarged diameter portion 40d of the chronograph shaft 40 via the bushing 45b.
The rotational force of the chronograph gear 45 is transmitted to the chronograph shaft 40 via the chronograph spring 46.

The chronograph spring 46 is a ring-shaped leaf spring member extrapolated to the third enlarged diameter portion 40d, and is disposed below the chronograph gear 45, and includes a flange portion 40e of the chronograph shaft 40, a chronograph gear 45, and the like. Are attached in a state sandwiched in the direction of the axis O1.
The chronograph spring 46 has a plurality of leg portions 46a that are radially formed at equal intervals in a circumferential direction (a direction around the axis O1). The plurality of leg portions 46a are warped upward toward the outer side in the radial direction (the direction orthogonal to the axis O1), and the outer edge portion is pressed against the lower surface of the gear main body 45a of the chronograph gear 45. ing. Further, the inner edge portion of the chronograph spring 46 is in pressure contact with the flange portion 40e in a state of surrounding the third enlarged diameter portion 40d from the outside in the radial direction.

  Accordingly, the chronograph gear 45 that is rotatably fitted to the third enlarged diameter portion 40d is integrally connected to the chronograph shaft 40 via the chronograph spring 46, and at the time of chronograph operation, The rotational force of the chronograph gear 45 can be transmitted to the chronograph shaft 40 via the chronograph spring 46. Therefore, the chronograph shaft 40 rotates together with the chronograph gear 45 by the rotational force from the rotor 26 c in the second step motor 26.

  On the other hand, since the chronograph gear 45 is rotatably fitted to the third diameter-expanded portion 40d of the chronograph shaft 40, only the chronograph shaft 40 is moved along the axis line while the chronograph gear 45 is fixed. It is also possible to rotate around O1. At this time, the chronograph spring 46 rotates around the axis O <b> 1 together with the chronograph shaft 40, and the outer edge portion of the leg portion 46 a slides against the lower surface of the chronograph gear 45.

  As described above, in the chronograph shaft 40, the position where the chronograph second hand 14 points to 12:00 is the initial position P1 (see FIG. 4), and the chronograph is operated with reference to the initial position P1. Rotate.

  As shown in FIG. 2, the return part 41 rotates with the rotation of the transmission gear (first rotating body according to the present invention) 50 that rotates with the rotation of the chronograph shaft 40 and the rotation of the chronograph shaft 40. A heart cam 51 that is forcibly rotated based on a chronograph reset instruction and positioned at a specified position P2 (see FIG. 4), elastically deforms along with the forcible rotation of the heart cam 51, and transmits the transmission gear 50 by restoring deformation. A balance spring (an elastic body according to the present invention) 52 that rotates the chronograph shaft 40 to return to the initial position P1 by following the forced rotation of the shaft 51.

  As described above, the transmission gear 50 is fixed to the first diameter-expanded portion 40b of the chronograph shaft 40, and is disposed coaxially with the axis O1 of the chronograph shaft 40. Therefore, the transmission gear 50 rotates around the axis O1 together with the chronograph shaft 40. A tooth portion 50 a is formed on the outer edge portion of the transmission gear 50 over the entire circumference. The transmission gear 50 is formed with an annular transmission wall 50b that protrudes downward and surrounds the second enlarged diameter portion 40c of the chronograph shaft 40 from the outside in the radial direction. The transmission wall portion 50 b protrudes downward to the extent that it does not contact the heart cam 51.

  As described above, the heart cam 51 is rotatably fitted to the second enlarged diameter portion 40c of the chronograph shaft 40. At this time, a predetermined frictional force is secured between the second enlarged diameter portion 40 c and the heart cam 51, and the heart cam 51 can rotate together with the chronograph shaft 40. Therefore, the heart cam 51 rotates around the axis O1 together with the chronograph shaft 40 when the chronograph is operated.

  As shown in FIGS. 2 and 3, the heart cam 51 has a part of the outer peripheral surface which is a flat contact part 51a, and a part located on the opposite side of the contact part 51a in the radial direction across the axis O1. Is formed in the shape of a heart in a plan view with the protrusion 51b. A part of the heart cam 51 on the inner edge side is a protruding cylindrical portion 51c protruding upward.

The heart cam 51 is configured to be forcibly rotated by being hit by the hammer 53 when the chronograph reset instruction is issued, and to be positioned at a specified position P2 associated with the initial position P1. Has been.
Specifically, in the present embodiment, as shown in FIG. 4, when the chronograph shaft 40 is located at the initial position P1 and the chronograph second hand 14 indicates 12:00, the heart cam 51 has the projection 51b at 12:00. The position of the heart cam 51 at this time is the prescribed position P2. In FIG. 4, a second hairspring 56 described later is omitted (the second hairspring 56 is also omitted in FIGS. 7 and 8).

When the chronograph reset instruction is issued, the heart cam 51 is forcibly rotated with respect to the chronograph shaft 40 by being hit by the hammer 53 with an external force exceeding the friction force. Then, when the hammer 53 comes into contact with the contact portion 51a of the heart cam 51, the heart cam 51 is stably positioned at the specified position P2.
Thus, the heart cam 51 rotates with the chronograph shaft 40 when the chronograph is operated, and rotates with respect to the chronograph shaft 40 when the chronograph is reset.

  As shown in FIG. 2, the hammer 53 is arranged between the train wheel bridge 21 and the chronograph receiver 22 and operates when the reset button 28 is pressed to strike the heart cam 51 and apply external force. It is a watch part that adds.

  As shown in FIGS. 2 and 3, the hairspring 52 is wound so as to have an initial elastic force, and is disposed between the protruding cylindrical portion 51 c of the heart cam 51 and the transmission wall portion 50 b of the transmission gear 50. . In the illustrated example, the hairspring 52 is arranged with a first hairspring 55 and a space below the first hairspring 55, and a second hairspring wound in a direction opposite to the first hairspring 55. 56 and two hairsprings.

As shown in FIGS. 2, 3 and 5, the first hairspring 55 has an outer end portion 55 a connected to the inner surface of the transmission wall portion 50 b and an inner end portion 55 b connected to the protruding cylinder portion 51 c of the heart cam 51. It is connected to the whiskers 57. Thereby, the first hairspring 55 is connected to the heart cam 51 via the whisker ball 57.
In the first hairspring 55, the winding direction from the outer end 55a toward the inner end 55b coincides with the forced rotation direction T1 of the heart cam 51 at the time of resetting the chronograph. Accordingly, the first hairspring 55 is elastically deformed so as to reduce in diameter (in the direction of the arrow L1 shown in FIG. 5) with the forced rotation of the heart cam 51 at the time of resetting the chronograph.
The forced rotation direction T1 of the heart cam 51 when the chronograph is reset coincides with the rotation direction of the heart cam 51 when the chronograph is activated.

As shown in FIGS. 2, 3 and 6, in the same manner as the first hairspring 55, the second hairspring 56 is connected to the inner surface of the transmission wall portion 50 b and the inner end portion 56 b is the hairspring. It is connected to the ball 57. As a result, the second hairspring 56 is connected to the heart cam 51 via the whisker ball 57.
Since the second hairspring 56 is wound in the opposite direction to the first hairspring 55 as described above, the diameter is increased with the forced rotation of the heart cam 51 at the time of resetting the chronograph (arrow shown in FIG. 6). L2 direction).

  As shown in FIG. 2, the rotation suppressing unit 42 imparts rotational resistance to the oil rotor 60 (second rotating body according to the present invention) that rotates with the rotation of the chronograph shaft 40 and the oil rotor 60. A viscous fluid (resistor according to the present invention) 61.

The oil rotor 60 includes a rotor pinion 60a and a rotor disk 60b. An upper tenon portion is pivotally supported by a bearing 22B provided on the chronograph receiver 22, and a lower tenon portion is fixed to the train wheel bridge 21. The bearing groove 62a is pivotally supported. Thereby, the oil rotor 60 can be stably rotated around the axis O2.
The rotor pinion 60 a meshes with the tooth portion 50 a of the transmission gear 50. Thereby, the oil rotor 60 can be rotated with the rotation of the chronograph shaft 40. The rotor disk 60 b is disposed in the cavity 62 and is rotatable in the viscous fluid 61 filled in the cavity 62.

  The cavity 62 is formed in a bottomed cylindrical shape that opens upward, and is fixed to the train wheel bridge 21. The cavity 62 is filled with a viscous fluid 61. Further, an annular cap 63 that closes the opening is attached to the cavity 62, and the viscous fluid 61 is sealed in the cavity 62 in a liquid-tight manner, for example. The bearing groove 62 a that pivotally supports the lower tenon portion of the oil rotor 60 is formed in the central portion of the bottom surface of the cavity 62.

  The viscous fluid 61 is, for example, silicon oil having a predetermined viscosity, and imparts rotational resistance (viscous resistance) proportional to the angular velocity to the rotor disk 60b. Therefore, the rotation of the oil rotor 60 is suppressed while a larger rotation resistance is applied as the rotation speed increases.

(Clock action)
Next, the operation of the timepiece 1 configured as described above will be described.
First, the time display will be briefly described.
In this case, since the crystal unit in the crystal unit oscillates at a predetermined frequency, the oscillation unit built in the integrated circuit outputs a reference signal based on the vibration of the crystal unit, and the frequency division unit Divides the reference signal from the oscillator. And a drive part outputs the motor drive signal which drives the 1st step motor 25 based on the output signal of a frequency division part. Thereby, the stator 25b of the first step motor 25 shown in FIG. 1 is magnetized and the rotor 25c rotates.

  Then, the rotational force of the rotor 25c is transmitted to the fourth wheel via the fifth wheel, and the fourth wheel rotates once per minute to rotate the second hand 15 shown in FIG. 1 once per minute. Further, the rotational force transmitted to the fourth wheel is transmitted to the third wheel, the second wheel 30 and the hour wheel 31, and these vehicles rotate. At this time, the center wheel 30 rotates once per hour, and the hour wheel 31 rotates once per 12 hours. Thereby, the minute hand 13 shown in FIG. 1 is rotated once per hour, and the hour hand 12 is rotated once per 12 hours. In this way, accurate time can be recorded and time can be displayed.

Next, a case where the chronograph is operated will be described.
In this case, the start / stop button 27 shown in FIG. Then, since the chronograph drive unit outputs a motor drive signal to the rotor 26c of the second step motor 26, the stator 26b of the second step motor 26 is magnetized and the rotor 26c rotates. The rotational force of the rotor 26 c is transmitted to the chronograph gear 45 shown in FIG. 2 and is transmitted to the chronograph shaft 40 via the chronograph spring 46. Thereby, the chronograph shaft 40 can be rotated around the axis O1 with the initial position P1 as a reference. And as shown in FIG. 1, since the chronograph second hand 14 displays time information (measurement second) based on rotation of the chronograph shaft 40, time measurement can be performed accurately.

  When the chronograph is operated, the heart cam 51 and the transmission gear 50 are rotated together with the rotation of the chronograph shaft 40 as shown in FIGS. At this time, since the heart cam 51 and the transmission gear 50 rotate in synchronization with each other, the first hairspring 55 and the second hairspring 56 rotate following the heart cam 51 and the transmission gear 50 without elastic deformation. Further, the oil rotor 60 rotates around the axis O <b> 2 as the transmission gear 50 rotates. At this time, since the rotor disk 60b rotates in the viscous fluid 61, rotational resistance is imparted. However, since the rotational speed at the time of chronograph operation is not large, the rotational resistance received from the viscous fluid 61 is also small. Not enough to affect performance.

Next, a case where the operation of the chronograph is stopped and then reset will be described.
In this case, the start / stop button 27 shown in FIG. Then, since the output of the motor drive signal from the chronograph drive unit is stopped, the rotor 26c of the second step motor 26 is stopped, and the rotation of the chronograph shaft 40 and the chronograph second hand 14 is stopped.
Next, when the reset button 28 shown in FIG. 1 is pushed in and a reset instruction is issued, the return unit 41 returns (returns to zero) the chronograph shaft 40 to the initial position P1. Thereby, the position of the chronograph shaft 40 and the chronograph second hand 14 can be reset to the original position, and the operation of the next chronograph can be prepared.

The above-described reset will be described in detail.
When a reset instruction is issued, as shown in FIG. 7, the hammer 53 is actuated to strike the outer peripheral surface of the heart cam 51 and apply an external force. Then, as shown in FIG. 8, the heart cam 51 is forcibly rotated around the axis O <b> 1 by an external force from the hammer lever 53 and is positioned at the specified position P <b> 2 by the hammer lever 53. At this time, the heart cam 51 receives an external force exceeding the frictional force between the heart cam 51 and the second enlarged diameter portion 40 c of the chronograph shaft 40, and thus rotates in advance with respect to the chronograph shaft 40.

When the heart cam 51 is forcibly rotated, the rotation of the chronograph shaft 40 and the transmission gear 50 is stopped, and the hair ball 57 rotates together with the heart cam 51, so that the first hair spring 55 and the second hair spring 56 are elastically deformed. At this time, as shown in FIGS. 5 and 8, the first hairspring 55 is elastically deformed so as to reduce the diameter, and as shown in FIG. 6, the second hairspring 56 is elastically deformed so as to increase the diameter.
Therefore, when the heart cam 51 is positioned at the specified position P2, the first hairspring 55 and the second hairspring 56 begin to be deformed and deform, and the transmission gear 50 follows the forced rotation of the heart cam 51 as shown in FIG. Rotate with a delay. Thereby, the chronograph shaft 40 and the chronograph second hand 14 can be rotated around the axis O1 via the transmission gear 50, and can be reset to the original positions as shown in FIG.

  As described above, the heart cam 51 is forcibly rotated first, and thereafter, the chronograph shaft 40 and the chronograph second hand 14 are returned to zero using the restoring deformation by the first hairspring 55 and the second hairspring 56, so that the smoothness is smooth. It can be reset with continuous hand movement.

  By the way, as described above, the rotation suppressing unit 42 suppresses the rotation speed of the chronograph shaft 40 until the chronograph shaft 40 is returned to the initial position P1 by the return unit 41. As a result, the zero return speed of the chronograph shaft 40 can be controlled, and the chronograph shaft 40 is not instantaneously returned to the initial position P1, but can be returned while continuously operating the desired zero return speed. it can.

explain in detail.
When the transmission gear 50 is rotated by the restoring deformation by the first hairspring 55 and the second hairspring 56, the oil rotor 60 is rotated around the axis O2 with the rotation of the transmission gear 50 as shown in FIG. At this time, since the rotor disk 60 b rotates in the viscous fluid 61, the oil rotor 60 receives a rotational resistance proportional to the angular velocity from the viscous fluid 61. Therefore, the chronograph shaft 40 is not instantaneously returned to the initial position P1, but can be returned in a state where the zero return speed is suppressed.
The zero return speed can be adjusted by adjusting the type of the viscous fluid 61, the volume in the cavity 62, the shape of the rotor disk 60b, and the like.

  As described above, according to the chronograph mechanism 24 of the present embodiment, the chronograph shaft 40 and the chronograph second hand 14 can be reset to the original positions by continuous hand movement while controlling the zero return speed. Accordingly, it is possible to prevent an excessive load from acting on the chronograph shaft 40 and the chronograph second hand 14 and to eliminate design restrictions in consideration of the load. Further, since the chronograph shaft 40 and the chronograph second hand 14 can be returned while continuously moving at a desired zero return speed, it is possible to quickly prepare for the next time measurement, and at the same time, the chronograph shaft at the time of zero return. The appearance of the movement of the 40 and the chronograph second hand 14 can be improved, and the design can be improved.

  In particular, the transmission gear 50 tends to gradually increase in rotational speed as the first hairspring 55 and the second hairspring 56 are restored and deformed. Therefore, in the present embodiment, when the chronograph shaft 40 is returned to zero, it is possible to return to the initial position P1 while gradually increasing the return zero speed and then gradually decelerating the resistance from the viscous fluid 61. . Therefore, the movement of the chronograph shaft 40 and the chronograph second hand 14 at the time of zero return can be given a unique change different from the conventional one, and the design can be further improved and the added value can be increased.

Further, in the above embodiment, since the hairspring 52 having the first hairspring 55 and the second hairspring 56 is used, the bending deformation of the hairspring 52 can be used, and the chronograph shaft 40 can be accurately obtained over a long period of time. Can be nullified, and the reliability can be improved.
Furthermore, since the first balance spring 55 and the second balance spring 56 having opposite directions of restoring deformation are used, the chronograph shaft 40 can be more stably and quickly stopped with respect to the initial position P1, and the chronograph can be more accurately. The axis 40 can be nulled.

  Further, according to the movement 10 and the timepiece 1 of the present embodiment, since the chronograph mechanism 24 is provided, there are no design restrictions and the high-quality movement 10 and the timepiece 1 have excellent operation performance. be able to.

(Second Embodiment)
Next, a second embodiment according to the present invention will be described with reference to the drawings. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the first embodiment, the chronograph shaft 40 and the heart cam 51 are arranged coaxially, but in the second embodiment, they are arranged in a plane.

  As shown in FIGS. 9 and 10, the chronograph mechanism 70 of the present embodiment includes a heart cam wheel 72 having a chronograph shaft 40, a transmission wheel 71 and a heart cam 51 between a train wheel bridge 21 and a chronograph receiver 22. Are arranged in a plane. In FIGS. 9 and 10, the illustration of the watch parts is omitted as appropriate, and the drawings are simplified.

  A second chronograph gear 73 is fixed to the first enlarged diameter portion 40b of the chronograph shaft 40 by, for example, press fitting. A tooth portion 73 a is formed on the outer edge portion of the second chronograph gear 73 over the entire circumference, and meshes with the rotor pinion 60 a of the oil rotor 60.

The transmission wheel 71 includes a transmission wheel shaft 74 and a transmission gear 50 fixed to the transmission wheel shaft 74. The transmission axle 74 is pivotally supported by a bearing 22 </ b> C provided on the chronograph receiver 22 at the upper tenon portion, and supported by a bearing groove 21 </ b> A provided on the train wheel bridge 21 at the lower tenon portion. Thereby, the transmission wheel 71 can be stably rotated around the axis O3.
The transmission gear 50 is fixed to a portion of the transmission axle 74 located below the upper tenon portion. Further, the tooth portion 50 a of the transmission gear 50 of the present embodiment meshes with the tooth portion 73 a of the second chronograph gear 73. As a result, the transmission wheel 71 rotates around the axis O3 as the chronograph shaft 40 rotates.

A whisker ball 57 is rotatably fitted to a portion of the transmission axle 74 positioned below the transmission gear 50. Between the hair ball 57 and the transmission wall 50b of the transmission gear 50, a hairspring (elastic body according to the present invention) 75 wound to have an initial elastic force is disposed. The hairspring 75 has an outer end connected to the transmission wall portion 50 b and an inner end connected to the hairball 57.
In addition, an annular coupling gear 76 having a tooth portion 76 a formed on the outer edge portion around the entire circumference is fixed to the hair ball 57 so as to be disposed below the hairspring 75.

  A predetermined frictional force is ensured between the transmission axle 74 and the whiskers 57, and the whiskers 57 can rotate together with the transmission axles 74. Therefore, the whisker 57 and the connecting gear 76 rotate around the axis O3 together with the transmission axle 74 when the chronograph is operated.

The heart cam wheel 72 includes a heart cam axle 77, a heart cam 51 fixed to the heart cam axle 77, and a heart cam gear 78 having a circular shape in plan view fixed to the heart cam axle 77.
The heart cam axle 77 is pivotally supported by a bearing 22 </ b> D provided on the chronograph receiver 22, and a lower tenon is pivotally supported by a bearing groove 21 </ b> B provided on the train wheel bridge 21. Thereby, the heart cam wheel 72 can be stably rotated around the axis O4.

  The heart cam gear 78 is disposed between the upper tenon portion of the heart cam axle 77 and the heart cam 51, and a tooth portion 78a that meshes with the tooth portion 76a of the connecting gear 76 is formed on the outer edge over the entire circumference. . Thereby, when the chronograph is operated, the heart cam wheel 72 rotates around the axis O4.

  In the present embodiment, as described above, the inner end portion of the hairspring 75 is connected to the heart cam 51 via the hair ball 57, the coupling gear 76, the heart cam gear 78, and the heart cam axle 77. Accordingly, the whistle ball 57, the connecting gear 76, the heart cam gear 78, and the heart cam axle 77 serve as a wheel train 79 connected to the heart cam 51, and the inner end portion of the hairspring 75 and the heart cam 51 are connected via the wheel train 79. Has been.

(Operation of chronograph mechanism)
In the chronograph mechanism 70 configured as described above, when the chronograph is operated, the transmission wheel 71 rotates around the axis O3 and the heart cam wheel 72 rotates around the axis O4 as the chronograph shaft 40 rotates. The oil rotor 60 rotates about the axis O2. At this time, since the transmission gear 50 and the connection gear 76 rotate in synchronization, the hairspring 75 rotates following the transmission gear 50 and the connection gear 76 without elastic deformation.

  Next, when a reset instruction is issued after the operation of the chronograph is stopped, the hammer 53 hits the outer peripheral surface of the heart cam 51 to apply an external force, so that the entire heart cam wheel 72 is forcibly rotated around the axis O4. Accordingly, the connecting gear 76 and the whisker ball 57 rotate around the axis O <b> 3 with the forced rotation of the heart cam 51. At this time, the whisker ball 57 receives an external force exceeding the frictional force with the transmission axle 74, and thus rotates in advance with respect to the stopped transmission axle 74. As a result, the hairspring 75 is elastically deformed so as to reduce or expand the diameter.

  Then, the hairspring 75 starts to be deformed and deformed after elastic deformation, and rotates the transmission gear 50 with a delay so as to follow the forced rotation of the heart cam wheel 72 and the connecting gear 76. Thereby, the chronograph shaft 40 and the chronograph second hand 14 can be rotated around the axis O1 via the transmission gear 50 and the second chronograph gear 73, and can be reset to the original positions.

As described above, even in the case of the chronograph mechanism 70 of the present embodiment, the chronograph is forcibly rotated by first rotating the heart cam 51 and then using the restoring deformation by the hairspring 75, as in the first embodiment. The shaft 40 and the chronograph second hand 14 can be returned to zero and can be reset with a smooth continuous hand movement.
In particular, in the case of the present embodiment, since the heart cam wheel 72 having the chronograph shaft 40, the transmission wheel 71 and the heart cam 51 is arranged in a plane, it is possible to contribute to the thinning of the movement 10 and the timepiece 1. . Other functions and effects can achieve the same functions and effects as those of the first embodiment.

(Modification)
By the way, in the said 2nd Embodiment, although the one hairspring 75 was utilized, it is not limited to this case, 2nd of the 1st hairspring 55 and the 2nd hairspring 56 similarly to 1st Embodiment. Two hairsprings may be used. In particular, it is preferable to use two hairsprings having different winding directions because the chronograph shaft 40 can be easily stopped at the initial position P1.

In the second embodiment, the transmission gear 50 and the heart cam 51 are arranged in a plane, but they may be arranged coaxially as shown in FIGS. 11 and 12, for example.
In the chronograph mechanism 80 shown in FIGS. 11 and 12, the transmission wheel 71 includes a heart cam 51. Specifically, the heart cam 51 is fixed to a whisker ball 57 that is rotatably fitted to the transmission axle 74 in place of the connecting gear 76.
Even in the case of such a configuration, the same effects as those of the second embodiment can be achieved. In particular, in this case, since the heart cam wheel 72 can be omitted, the configuration can be simplified.

(Third embodiment)
Next, a third embodiment according to the present invention will be described with reference to the drawings. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the first embodiment, the first hairspring 55 and the second hairspring 56 are used as an example of the elastic body. However, in the third embodiment, an operating lever spring is used.

As shown in FIGS. 13 and 14, in the chronograph mechanism 90 of this embodiment, the operating lever 91 and the operating lever spring (the elastic body according to the present invention) 92 are attached to the lower surface of the transmission gear 50.
The operating lever 91 is disposed so as to overlap the lower surface of the transmission gear 50, the distal end portion 91 a is a free end, and the base end portion 91 b is rotated to the lower surface of the transmission gear 50 via the rotation pin 93. Attached so as to be rotatable around the pin 93.

  Similarly to the operation lever 91, the operation lever spring 92 is disposed so as to overlap the lower surface of the transmission gear 50, and is formed in an arc shape along the outer periphery of the transmission gear 50. One end side of the operating lever spring 92 is fixed to the lower surface of the transmission gear 50 via two fixing pins 94. The other end of the operating lever spring 92 is an elastically deformable free end 92a, and always biases the operating lever 91 toward the heart cam 51. Thereby, the operating lever 91 receives an elastic force (biasing force) by the operating lever spring 92, and the tip end portion 91 a always presses the outer peripheral surface of the heart cam 51. In the initial state, the distal end portion 91 a of the operating lever 91 presses the contact portion 51 a of the heart cam 51.

  The heart cam 51 of this embodiment is thicker than that of the first embodiment, and the hammer lever 53 strikes the outer peripheral surface of the heart cam 51 without interfering with the operating lever 91 and the operating lever spring 92. Is possible.

(Operation of chronograph mechanism)
In the chronograph mechanism 90 configured as described above, when the chronograph is operated, the transmission gear 50 and the heart cam 51 are rotated around the axis O1 in synchronization with the rotation of the chronograph shaft 40 as shown in FIG. Therefore, the operating lever 91 and the operating lever spring 92 rotate following the transmission gear 50 and the heart cam 51 without operating.

  Next, when a reset instruction is issued after the operation of the chronograph is stopped, as shown in FIG. 15, since the hammer 53 hits the outer peripheral surface of the heart cam 51 and applies an external force, the heart cam 51 is forced around the axis O1. It is rotated and positioned at the specified position P2 by the hammer 53. At this time, the heart cam 51 receives an external force exceeding the frictional force between the heart cam 51 and the second enlarged diameter portion 40 c of the chronograph shaft 40, and thus rotates in advance with respect to the chronograph shaft 40.

  When the heart cam 51 is forcibly rotated, the distal end portion 91a of the operating lever 91 is moved relatively along the outer peripheral surface of the heart cam 51, and the distal end portion 91a is moved around the rotation pin 93 so that the distal end portion 91a moves outward in the radial direction. Rotate. As a result, the operating lever spring 92 is elastically deformed outward in the radial direction. Therefore, when the heart cam 51 is positioned at the specified position P <b> 2, the operating lever spring 92 begins to be restored and further presses the distal end portion 91 a of the operating lever 91 against the outer peripheral surface of the heart cam 51. At this time, since the operating lever 91 and the operating lever spring 92 receive the reaction force R from the heart cam 51, the operating lever 91 and the operating lever spring 92 receive a rotational moment at the center of the transmission gear 50, and the transmission gear 50 is delayed so as to follow the forced rotation of the heart cam 51. Rotate.

Accordingly, as shown in FIG. 16, the chronograph shaft 40 and the chronograph second hand 14 can be rotated around the axis O1 via the transmission gear 50, and can be reset to the initial position P1. By this reset, the distal end portion 91a of the operating lever 91 is in a state of pressing the contact portion 51a of the heart cam 51 again.
As described above, even in the case of the present embodiment, the heart cam 51 is forcibly rotated first, and then the chronograph shaft 40 and the chronograph second hand 14 are returned to zero using the restoring deformation by the operating lever spring 92. Can be reset with a smooth continuous hand movement. Other functions and effects can achieve the same functions and effects as those of the first embodiment.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in each of the above embodiments, the quartz type timepiece 1 has been described as an example, but the present invention may be applied to a mechanical type timepiece. Further, as described above, one or two hairsprings may be used as the elastic body, or a configuration other than the hairspring such as an operating lever spring may be employed.

  Further, in each of the above embodiments, the case where the chronograph shaft 40 to which the chronograph second hand 14 is attached is described as an example has been described, but the chronograph shaft 40 to which the chronograph minute hand and the chronograph hour hand are attached is described. It does not matter if it is zeroed.

  In each of the above embodiments, a resistance adjustment groove for adjusting the viscous resistance or a resistance protrusion such as a blade may be formed on the rotor disk 60b of the oil rotor 60. By doing so, the rotational resistance of the oil rotor 60 can be easily adjusted, and the zero return speed of the chronograph shaft 40 can be further easily controlled.

  In each of the above embodiments, the viscous fluid 61 is described as an example of the resistor, but the present invention is not limited to this case. For example, you may utilize gas, such as air and specific gas. Even in this case, rotation resistance can be applied by appropriately devising the shape of the rotor disk 60b and the like.

Furthermore, as shown in FIGS. 17 and 18, a spiral spring may be used.
The chronograph mechanism 100 shown in FIGS. 17 and 18 uses the third embodiment as an example, and the same components as those in the third embodiment are denoted by the same reference numerals and description thereof is omitted.
The chronograph mechanism 100 in this case includes a rotor (second rotating body according to the present invention) 101 that rotates as the chronograph shaft 40 rotates, and a spiral spring that provides rotational resistance to the rotor 101 (according to the present invention). And a rotation suppressing portion 103 having a resistor 102).

The rotor 101 has a rotor pinion 101a that meshes with the tooth portion 50a of the transmission gear 50, and a whisker ball 105 fixed to a portion located below the rotor pinion 101a. The spiral spring 102 is wound so as to have an initial elastic force, the inner end portion 102 a is fixed to the whistle ball 105, the outer end portion 102 b is a free end, and is in contact with the inner surface of the cavity 62. . At this time, the outer end portion 102b of the spiral spring 102 presses the inner surface of the cavity 62 from the inside. As a result, the spiral spring 102 rotates while the outer end portion 102 b always presses the inner surface of the cavity 62 as the rotor 101 rotates.
Therefore, even in this case, rotational resistance can be applied to the rotor 101, and the zero return speed of the chronograph shaft 40 can be suppressed.

P1 ... Initial position P2 ... Specified position 1 ... Clock 10 ... Movement (timepiece movement)
14 ... Chronograph second hand (display)
24, 70, 80, 90, 100 ... Chronograph mechanism (time display mechanism)
40 ... Chronograph axis (indicator)
41 ... Returning part 42, 103 ... Rotation suppressing part 50 ... Transmission gear (first rotating body)
51 ... Heart cam 52, 75 ... Hairspring (elastic body)
55 ... 1st hairspring 56 ... 2nd hairspring 60 ... Oil rotor (2nd rotary body)
61 ... Viscous fluid (resistor)
79 ... train wheel 92 ... actuating lever spring (elastic body)
101 ... Rotor (second rotating body)
102: Spiral spring (resistor)

Claims (8)

An indicator that rotates relative to the initial position;
A display unit for displaying time information based on rotation of the instruction unit;
Based on an instruction to end the display of the time information, a return unit that returns the instruction unit to the initial position;
A time display mechanism comprising: a rotation suppression unit that suppresses a rotation speed of the instruction unit until the instruction unit returns to the initial position. The timepiece display mechanism according to claim 1,
The return part is
A first rotating body that rotates in accordance with the rotation of the instruction unit;
A heart cam that rotates with the rotation of the instruction unit, is forcibly rotated based on the end instruction, and is positioned at a specified position associated with the initial position;
An elastic body that elastically deforms with the forced rotation of the heart cam, and rotates the first rotating body so as to follow the forced rotation of the heart cam by restoring deformation, and returns the indication unit to the initial position; A clock display mechanism comprising: The timepiece display mechanism according to claim 2,
The elastic body is wound so as to have an initial elastic force, an outer end is connected to the first rotating body, and an inner end is connected to the heart cam or a train connected to the heart cam. A clock display mechanism characterized by being. The timepiece display mechanism according to claim 3,
The hairspring is
With the first hairspring,
A timepiece display mechanism comprising: a second hairspring wound in a direction opposite to the first hairspring. The timepiece display mechanism according to any one of claims 1 to 4,
The rotation suppression unit is
A second rotating body that rotates in accordance with the rotation of the instruction unit;
A timepiece display mechanism comprising: a resistor that provides rotational resistance to the second rotating body. The timepiece display mechanism according to claim 5,
The timepiece display mechanism according to claim 1, wherein the resistor imparts a rotational resistance proportional to an angular velocity of the second rotating body.   A timepiece movement comprising the timepiece display mechanism according to any one of claims 1 to 6.   A timepiece comprising the timepiece movement according to claim 7.

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