JPS6293684A - Torque transmission structure of electronic timepiece - Google Patents

Abstract

PURPOSE:To reduce the thickness of a timepiece body by setting a piezoelectric element being a driving body and a pawl lever on a plane, by providing a pulley pin being a projection to a pulley being a rotary member and engaging said pulley pin with the pawl lever being a slide member. CONSTITUTION:A pulley pin 201 being a projection is provided on a pulley 209 being a rotary member so as to be engaged with a pawl lever 211 being a slide member. In this constitution, the torque transmitted to the pulley 209 is transmitted to the pawl lever 211 through the pulley pin 210 provided on the pulley 209 and the pawl lever 211 is guided into plane linear motion with respect to a main plate 201. By this method, a piezoelectric element 1 being a driving body and the pawl lever 211 can be set on a plane and the thickness of a timepiece body can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a torque transmission structure for an electronic timepiece that converts rotational torque into linear motion.

[Summary of the invention]

The present invention provides a structure for converting rotational torque in a cross-sectional direction with respect to the main plate of an electronic timepiece into planar linear movement F, JJ with respect to the main plate, in which a rotating member that transmits rotational torque has a convexity in the normal line/direction of the center of rotation. The convex part engages in a plane with a sliding member disposed parallel to the main plate in cross section, thereby reducing the cost of the watch and increasing its commercial value.

[Prior art]

Conventionally, there has been no electronic timepiece that has a member that rotates in a cross-sectional direction relative to the main plate and converts the movement into a planar linear motion relative to the main plate.

[Problems and Objectives to be Solved by the Invention] The present invention aims to reduce the thickness of an electronic timepiece and increase its commercial value.

[Means for solving problems]

The torque transmission structure of the electronic timepiece of the present invention is a structure that converts rotational torque in a cross-sectional direction with respect to the main plate of the electronic timepiece into planar linear motion with respect to the main plate. It is characterized in that a convex portion is provided in the direction, and the convex portion engages in a plane with a sliding member disposed parallel to the base plate in cross section.

Further, triangular bell-shaped holes 0fff are provided on both end surfaces of the rotating member.
E., triangular bell-shaped protrusions having angles different from the apex angle of the rotating member are arranged at two locations on the rotation axis of the rotating member parallel to the base plate, and at least one of the triangular bell-shaped protrusions It is characterized in that it slides in the axial direction, and the two convex portions engage with triangular bell-shaped holes on both end faces of the rotary member.

Further, the rotating member is characterized in that it includes a slope portion whose apex angle is centered on a normal line parallel to the base plate.

[Effect]

According to the above configuration of the present invention, the torque transmitted to the rotating member is transmitted to the sliding member via the convex portion provided on the rotating member, and guides the sliding member to planar linear motion with respect to the base plate.

〔Example〕

FIG. 1 shows a plan view of an embodiment of the present invention, and FIG. 2 shows a sectional view thereof. FIG. 3 shows a sectional view of the vibration-proof part, and FIG. 4 shows a plan view thereof. Fig. 5 shows a control signal diagram of the piezoelectric element, Fig. 6 shows a detailed view of the pawl lever and second gear, Fig. 7 shows a sectional view of the transmission section, and Fig. 8 shows its plan view. indicates the same part.

From Figures 1 and 2, an oscillation circuit equipped with a crystal resonator that oscillates using electrical energy, a frequency divider circuit that divides the frequency of the signal transmitted by the crystal resonator, and a booster circuit that increases the voltage of the frequency-divided signal. , Detection to check the state of the bimorph piezoelectric element 1, in which two piezoelectric materials made of a material exhibiting a piezoelectric phenomenon, such as barium titanate, are sandwiched between shims made of an elastic material such as metal or carbon fiber. The circuit is implemented in a circuit block 10. Note that the bimorph type piezoelectric element 1 will be referred to as a piezoelectric element 1 from now on.

The piezoelectric element 1 has a base plate 2 made of metal or synthetic resin, etc.
It overlaps with 01 two-dimensionally. The piezoelectric element 1 is located above the slide plate 204 made of metal or synthetic resin, and the element holding plate 2 is made of metal or synthetic resin.
It is located below 05. Piezoelectric element 1 is slide plate 2
It is guided to the bottles 25 and 26 planted in the container 04, and is fixed by pressure contact with a screw through an element holding plate 205. Slide plate 204 and element holder +Ii 205 is piezoelectric element l
It also serves as electrical continuity to. An insulating plate 206 made of an insulating material is provided with a piezoelectric element l provided on the slide plate 204.
The piezoelectric element 1 is pushed into a groove parallel to the longitudinal end surface of the
The piezoelectric element 1 rises in the planar gap between the slide plate 204 and the slide plate 204
The slide plate 204 is insulated from the longitudinal end face of the slide plate 204, and also serves as a guide for the piezoelectric element 1 in the planar direction. Furthermore, the pin 104 planted on the ground plate 2°I also serves as a guide for the piezoelectric element 1 in the plane direction. The slide plate 204 has holes 101 and 102 for sliding completely parallel to the end face of the piezoelectric element 1 in the longitudinal direction. From this, the slide plate 204 is the bottle 1 planted on the main plate 201.
It is guided by Miki pins 01, 102, and 103 and fixed with screws. Note that the slide plate 204. When the element retainer 20'5 is made of synthetic resin, it is sufficient if it is thickened so as to be electrically conductive with the piezoelectric element 1, and the same applies when the base Fi 201 is made of synthetic resin. Furthermore, the slide plate 204 and the insulating plate 206 may be omitted.
The piezoelectric element 1 may be placed directly between the piezoelectric element 1 and the element holding member 205.

The piezoelectric element 1 is fixed on one side by an element holding plate 205,
A pulley 20 whose other end is made of metal or synthetic resin, etc.
8 is engaged. The pulley 209 is provided with an inclined surface 209a whose apex angle is centered on a normal line substantially parallel to the ground body 201, and is engaged with the piezoelectric element 1 (see FIGS. 7 and 8).
. Further, a pulley bin 210 made of metal or synthetic resin is planted on the pulley 209 in a normal direction substantially perpendicular to the main plate 201 in cross section. The pulley bin 210 is provided with a circular arc shape 1210a.

Note that the pulley pin 210 may be integrated with the pulley 209, the groove 210a of the pulley bin 210 may have a square shape or may be omitted, and both sides of the pulley 209 are provided with bearing portions 209b having triangular bell-shaped holes. ing. The pulley 209 is supported from both ends by bearing pins 212 made of metal, synthetic resin, or the like and having an apex angle different from that of the bearing portion 209b. The bearing pin 212a is embedded in a metal or synthetic resin pulley holder (lower) 208 whose position is determined by throwing it into a bin 1'4.15 planted on the base plate 201. The pulley holder (upper) 207 made of metal or synthetic resin is attached to the base plate 2.
The bearing pin 212b is guided to the bottle 14.15 that was planted in the plant 01 and fixed with a screw. Further, a track-shaped hole 14.15 is provided which is long in the direction of the rotational axis of the pulley 209, and the bearing portion 209b of the pulley 209 and the bearing pins 212a, b are engaged with each other. Note that the pulley receivers 207 and 208 and the bearing pin 212 may be integrated.

A claw lever 211 that slides in a plane direction with respect to the base plate 201 is interposed between a train wheel bridge 202 and a claw lever receiver 203 made of metal, synthetic resin, or the like.

The pawl lever 211 is provided with an elastic portion 211a, and the pulley bin 210 has an arc-shaped elastic portion 211a. I210a and elastic part 2
11a are engaged by a tightening margin.

From this, the arc-shaped 'tR210a of the pulley bin 210
The elastic portion 21.1a of the pawl lever 211 is in point contact with the claw lever 211 to reduce friction as much as possible. The elastic portion 211a of the pawl lever 211 has a hole shaped like II in plan view.

The shape of the elastic portion 211a may be any shape as long as it bends in the cross-sectional direction with respect to the claw lever 211, and the engagement between the pulley bin 210 and the claw lever 211 may be either pressure contact or matching 3M fit. The other end of the claw lever 211 is provided with elastic portions 211b and 211c extending in two different directions in a plane, and the tips of the elastic portions 211b and c are provided with claw portions 211d and 211e, respectively (see FIG. 6).
. There is a hole 10 in the track shape 4 in the center of the pawl lever 211.
3 is provided on a straight line connecting the second wheel and the pulley bin 210, and is engaged with a pin 103 planted in the main plate 201. The pawl portion 211d of the pawl lever 211, +3 is the second gear 4
is engaged with. As described above, the pawl lever 211 engages with the pulley bin 210, second gear 4, and pin 103, and the bearing portion 20
It is located between the two-degree planar convex portion 202a.

The second gear 4 is provided with saw-shaped teeth, and the second gear 4 is supported via a pawl lever receiver 203, a center pipe 2131 planted in the main plate 201, and a minute wheel 2. Claw portion 211d
. The position is shifted by approximately half a pitch (see Figures 3 and 4).The center of rotation of the center of rotation between the center of rotation of the center of rotation between the center of rotation of the center of gravity 222a, which is positioned to sandwich the piezoelectric element 1 that overlaps the base plate 201 with a gap therebetween. An elastic portion 22 is provided between one fulcrum 223 and another fulcrum 224.
The elastic part 222b of the anti-vibration lever 222 provided with the
A mass portion 225 made of metal, synthetic resin, or the like is provided. The fulcrums 223 and 224 are the anti-vibration lever 22
2 is planted on one side of the anti-vibration light 220 and 221, which are arranged so as to sandwich the two from both sides in a plane. Vibration resistance 2
20.221 is bottle 1 planted on the main plate 201
6 and is fixed to the base plate 201 with screws.

The anti-vibration light 220 and 221 are made of metal or synthetic resin, and the anti-vibration lever 222 and the mass part 225, as well as the anti-vibration light 220 and the fulcrum 222°223, may be integrated.
J, the pond is arranged so as to overlap the base plate 201 and a part of the piezoelectric element in a plane.

An oscillation circuit equipped with a crystal oscillator that oscillates with electrical energy, and a drive signal generated by the oscillation circuit (a frequency divider circuit that divides the frequency of No. 3) and a booster circuit that increases the voltage of the frequency-divided signal is , connect the positive potential electrode to the pin planted on the ground plate 201, slide it from the ground plate 201 to the element holder 204 through the pins 25 and 26.
5). The slide manual pressure 204 is the pin 101
, 102° 103 and guided by Miki's pins, the piezoelectric element 1 slides in a plane until it joins with the pulley 209. The negative electrode is connected directly to the shim material of the piezoelectric element 1 by a conductive wire 214. Note that the direction of the positive and negative electrodes does not matter, and the conduction to the shim material does not need to be a conductive wire.

The piezoelectric element 1 applied by the drive signal transmitted from the booster circuit bends upward in the cross-sectional direction with respect to the ground plane 201. If the polarity is reversed, it will deflect downward. If the polarity is reversed, it will deflect downward. When the piezoelectric element 1 is deflected, the pulley 209 engaged with the piezoelectric element 1 rotates about the bearing pin 212. The bearing pin 212 b 'fc (Jfft) The pulley bearing (upper) 207 is the
pin 1 in the direction of the rotation axis of pulley 209 until it joins pin b.
4. Slide using 15 as a guide. It is good to have guidance at two or more locations.

As the pulley 209 rotates, the pulley pin 210 installed on the pulley 209 rotates, causing the pawl lever 211 to slide away from the second gear 4 (see FIG. 6). A hole provided in the center of the pawl lever 211 and the pin 103 are connected to determine the sliding amount of the pawl lever. The initial state is shown in (a), and the state when voltage is applied is shown in (b).

At this time, the pawl portion 211e of the pawl lever 211 is engaged with the bottom 4a of the second gear 4, causing the second gear 4 to rotate counterclockwise in the plan view. Furthermore, at this time, the other claw portion 211d is attached to the elastic portion 21
1b deflects and climbs over the teeth of the second gear 4, and the tooth bottom 4a of the next tooth
to fall. The torque transmitted to the seconds gear 4 is transmitted to the fifth wheel 31, the minute wheel 21, the minute wheel 8, and the hour wheel to move the hands and display the time.The piezoelectric element 1 is short-circuited by the zero-order drive signal and returns to its original state. At this time, the charge stored inside the piezoelectric element 1 leaves the piezoelectric element 1 and is stored again in the capacitor provided in the booster circuit. The charge that has entered the capacitor is raised to a high voltage again by the booster circuit and output as a drive signal. Now, the pulley 209 is short-circuited and returns to its original state.
rotates, the pawl lever 211 slides in the direction approaching the second gear 4, and the pawl portion 211d pushes the tooth bottom 4a of the second gear 4.
Rotate counterclockwise on the plan view. The time is displayed by manipulating the series of waveforms of the drive signal. The driving signal may be applied not only in one direction but also in both directions. The piezoelectric element 1 is greatly deflected due to disturbances such as impact, and this deflection causes the claw portion 211d to
, e push and pull the teeth of the second gear 4 to rotate it.Now, when the piezoelectric element 1 is deflected, it generates a voltage. Voltage and deflection are in a proportional relationship, and the state of the piezoelectric element 1 can be easily determined from the voltage of the piezoelectric element 1. From Figure 5,
The voltage waveform generated by the piezoelectric element 1 due to the impact is shown in (a). The voltage waveform (A) is sampled by the detection circuit at fixed time intervals, is digitized by D/A conversion inside the circuit, and is outputted by the booster circuit as a reverse voltage (B) having the same voltage as that at the time of sampling. As a result, an electric field is applied to the piezoelectric element 1 in the opposite direction to the deflection direction caused by the disturbance, the piezoelectric element l is forcibly deflected in the opposite direction, the position of the piezoelectric element l is controlled, and the voltage waveform of the piezoelectric element l becomes (U). become that way. However, the detection circuit has limitations, and if a strong impact is applied, the vibration-proof lever 222 will cause an impact. 3 and 4, the natural frequencies of the anti-vibration lever 222 and the piezoelectric element 1 are set to be almost the same so that the piezoelectric element 1 and the mass part 225 vibrate in the same direction and in the same way. The degree determining portion 222a of the anti-vibration lever 222 is supported by a fulcrum 223, which is the center of rotation, and vibrates in the opposite direction to the mass portion 225. From this, the degree determining part 2
22a and the piezoelectric element 1 vibrate in opposite directions, and the degree determining part 222a contacts one end surface of the piezoelectric element 1.

The piezoelectric element 1 and the anti-vibration lever 222 cancel each other's kinetic energy and attenuate it. Further, the amplitude of the anti-vibration lever 222 is determined by the mass portion 225 hitting the end surfaces of the holes 220, 221a-b provided in the anti-vibration supports 220, 221. These anti-vibration levers 222 and the detection circuit prevent malfunctions caused by shocks.

〔Effect of the invention〕

As described above, according to the present invention, the pulley, which is a rotating member, is provided with a pulley pin, which is a convex portion, and is engaged with the pawl lever, which is a sliding member, so that the piezoelectric element, which is a driving body, and the pawl lever are engaged with each other. This has the effect of reducing the thickness of the watch body and improving its product value.

Furthermore, the pulley bearing with the bearing pin, which is a triangular bell-shaped convex part, slides in the direction of the rotation axis of the pulley, making it possible to assemble the pulley from the plane, improving ease of assembly. By engaging the bearing part of the pulley, which is the part, with the bearing pin, point contact is maintained, resulting in low frictional resistance and high durability. Furthermore, even if the bearing pins are misaligned to some extent, the structure according to the present invention can move accurately. Therefore, the structure is suitable for mass production.

By providing the pulley with a slope portion whose apex angle is centered on a normal line parallel to the ground plane, the torque generated from the piezoelectric element can be easily transmitted to the pulley.

From the above, the present structure is simple, easy to assemble, mass-producible, and reliable, and provides an optimal torque transmission structure for electronic watches.

[Brief explanation of drawings]

Fig. 1: A plan view of an embodiment of the present invention Fig. 2 (5) fb) (C1: A sectional view of an embodiment of the present invention Fig. 3: Vibration resistance of an embodiment of the present invention) Figure 4: Cross-sectional view of the section.
・Plan view of the vibration-proof part of one embodiment of the present invention FIG. 5 ・Control signal diagram of the piezoelectric element of one embodiment of the present invention FIG. 6 ・Details of the pawl lever and second gear of one embodiment of the present invention Figure 7: Cross-sectional view of the transmission section of an embodiment of the present invention Figure 8:
- Plan view 1 of the transmission part of an embodiment of the present invention... Piezoelectric element 201 - Ground fabric 207 - Pulley receiver (upper) 208 - Pulley receiver (lower) 209 - Pulley 210 - Pulley pin 211・Claw lever or higher

Claims (3)

[Claims] (1) In a structure that converts rotational torque in the cross-sectional direction of the main plate of an electronic watch into planar linear motion with respect to the main plate,
A rotating member that transmits rotational torque is provided with a convex portion in the normal direction of the center of rotation, and the convex portion engages in a plane with a sliding member disposed parallel to the main plate in cross section. Torque transmission structure. (2) Triangular bell-shaped holes are provided on both end faces of the rotating member, and triangular bell-shaped convex portions having angles different from the apex angle of the rotating member are arranged at two locations on the rotation axis of the rotating member parallel to the main plate. At least one of the triangular bell-shaped protrusions slides in the direction of the rotating shaft, and the two protrusions engage with triangular bell-shaped holes on both end faces of the rotating member. A torque transmission structure for an electronic timepiece according to claim 1. (3) The torque transmission structure for an electronic timepiece according to claim 1, wherein the rotating member includes a slope portion whose apex angle is centered on a normal line parallel to the base plate.