JP2005300283A - Electronic timepiece with chronograph function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic timepiece with a chronograph function having a miniaturized movement size and stable chronograph operation. <P>SOLUTION: The section of a working cam 140 is laminated so as to have at least two hierarchies having different plane shapes, and the section of the working cam 140 is decomposed into three layers, namely, an upper layer, a middle layer and a lower layer. A start-and-stop operation transfer member 152 and a working cam jumper 151 are arranged on the lower layer 141 of the working cam 140. A state detection member 160 of a safety mechanism for detecting the starting state of a chronograph pointer and preventing flyback operation caused by wrong operation of a flyback operation member is arranged on the middle layer 142 of the working cam 140. A primary position setting member 155 of a flyback mechanism for moving the flyback mechanism to a waiting position and a chronograph gear train stopping member 154 for stopping temporarily a part of a chronograph gear train are arranged on the upper layer 143 of the working cam 140. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a movement structure of an electronic timepiece with a chronograph function.

  Conventionally, there is an electronic timepiece with a chronograph function as one of multifunction watches. Such a timepiece has chronograph hands for hours, minutes, and seconds, for example, and measures time by performing a start / stop operation with a start / stop button provided on the timepiece. Then, the chronograph pointer is reset to the zero return position by performing a reset operation with a reset button provided on the timepiece.

  As an operation mechanism for such a start, stop, and reset operation of the timepiece, an operation cam is often used, and the start, stop, and reset of the chronograph function are controlled according to the rotation position of the operation cam. Yes. The start / stop electrical switching mechanism is provided with a special switch lever that operates according to the rotational position of the operation cam, and the switch portion provided on the switch lever is in contact with or separated from the pattern on the circuit board. The electrical switching is performed in (see, for example, Patent Document 1).

  In the mechanical nulling mechanism, the reset operation is performed mainly by pressing the hammer portion provided on the hammer in the heart cam portion provided on the chronograph pointer. In this case, it is known that when hammering is released, the hammer portion and the heart cam portion are separated from each other to generate a frictional force, and the chronograph pointer flare is generated by the backlash of the chronograph wheel train. In order to prevent this, a brake part is usually provided in the chronograph wheel train (see, for example, Patent Document 2). In addition, in the case of an electronic timepiece using a battery as a power source, it is known that torque generated by impact of a hammer causes a phase shift of the rotor, and even from this point, a brake part is provided in the chronograph wheel train. Measures are taken.

Japanese Patent No. 3446604 (pages 5-9, FIGS. 5-15) German Patent No. 1673729 (columns 4-5, FIG. 4)

  The operation mechanism of the start, stop, and reset operations described above is controlled according to the rotational position of the operation cam, but the members constituting this operation mechanism require many chronograph members due to the complexity of the mechanism. . Therefore, since many chronograph members related to start, stop, and reset must be arranged in a plane centering on the operating cam, it has been a big problem in the design in which the movement size is limited. As a means for solving this problem, a conventional structure has been adopted in which the working cam has a two-layer structure, and the chronograph member is distributed to each layer to suppress planar diffusion of the chronograph member. However, when aiming at further miniaturization of the movement size, the two-layer structure of the operating cam as described above is insufficient. Moreover, by making the operation cam into a two-layer structure, the chronograph members may be arranged in steps, or the chronograph member may require a bent portion, thereby significantly reducing the transmission efficiency between the members, In addition to not being able to obtain an appropriate feeling of operation, there is a problem that an excessive load is applied to the chronograph member and the member that pivotally supports the chronograph member.

  Further, in the electrical switching mechanism of the start / stop, as shown in FIG. 7 to FIG. 9 of Patent Document 1, the switch portion that operates by obtaining the mechanical synchronization with the rotation of the operation cam and contacting the pattern on the circuit board is provided. Must have a switch lever with. Therefore, the number of chronograph members increases, causing a malfunction due to variations in the dimensional accuracy of the members, and hinders effective utilization of the design space. In addition, there has been a problem that the cost of the members increases in terms of processing, assembly, and management.

  In the mechanical nulling mechanism, the reset operation is performed mainly by pressing the hammer portion provided on the hammer in the heart cam portion provided on the chronograph pointer. In this case, when the hammer is released, the contact between the hammer portion and the heart cam portion is released. Therefore, there is a problem that the chronograph pointer flare is generated by the backlash of the chronograph train due to the friction generated between the two.

  Furthermore, in the case of an electronic timepiece using a battery as a power source, a rotor having a weak rotational holding force is used from the viewpoint of extending the life of the battery, and the torque generated by impact at the time of hammering passes through the chronograph wheel train. There is a problem that the rotor is shifted in phase. As means for solving these problems, there is means for providing a brake portion in the chronograph wheel train. However, in this case, it becomes necessary to provide a dedicated brake member, and the same problem as the above-described switch lever occurs. Further, the chronograph mechanism is synchronized with the electrical switching mechanism of the chronograph function and the brake portion of the chronograph train wheel, and the switch lever having the switch portion that comes into contact with the pattern on the circuit board and the brake portion described above If configured separately as described above, it is difficult to achieve synchronization due to variations in the dimensional accuracy of each member, and it causes a destabilization of operation.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and provides an electronic timepiece with a chronograph function which is smaller in movement size than a conventional electronic timepiece with a chronograph function and stable in chronograph operation. There is to do.

  To achieve the above object, the present invention provides a start / stop switching operation member for operating and stopping a chronograph mechanism, a start / stop operation transmitting member operated by the start / stop switching operation member, and the start / stop operation transmission. An operation cam having a plurality of teeth rotating by operation of the member, a hammer operation member for performing a hammer operation of the chronograph mechanism, a hammer operation transmission member operated by the hammer operation member, and the hammer operation transmission A chronograph function for controlling start, stop and reset of the chronograph pointer in accordance with the rotational position of the operating cam. In the attached electronic timepiece, the cross sections of the operating cams are stacked so as to have at least two layers having different planar shapes, and the cross sections of the operating cams are divided into an upper layer, a middle layer and a lower layer. In the lower layer of the operating cam, a start / stop operation transmitting member and an operating cam jumper for regulating the rotational position of the operating cam are arranged, and in the middle layer of the operating cam, a chronograph A hammer detecting mechanism for detecting the start state of the pointer and preventing a hammer operation due to an erroneous operation of the hammer operating member is disposed, and a hammer mechanism for moving the hammer mechanism to a standby position above the operating cam The initial position setting member and a chronograph train wheel stop member for stopping a part of the chronograph train wheel are arranged.

In this way, the cross section of the operating cam is disassembled into three layers, an upper layer, a middle layer, and a lower layer, and a start / stop operation transmission member, an operating cam jumper, a state detection member, an initial position setting member, and a chronograph By disposing the train wheel stop member in cross-section, it becomes possible to gather these chronograph members around the operating cam and further suppress the planar diffusion of the chronograph members, thereby further reducing the movement size. Can be achieved. Furthermore, it is possible to effectively utilize the planar space of the movement, simplifying the chronograph member shape and securing a sufficient stroke amount of the chronograph member, which contributes to stabilization of the chronograph operation. it can.

  The chronograph train wheel stop member includes a detection lever portion that meshes with the operation cam and detects a state of the operation cam, a brake portion that has a spring portion and stops a part of the chronograph train wheel, An electric contact lever part that contacts a pattern formed on a circuit board on which a control unit for controlling the chronograph wheel train is mounted and sends a start signal to the control unit, and the detection lever part to the operating cam It is desirable that the return spring portion for stably pressing is integrally formed.

  In this way, it is not necessary to divide the brake part and the electrical contact lever part into separate members. Therefore, the influence of the dimensional accuracy and assembly accuracy of the members is reduced, and it becomes easy to synchronize the electrical switching and the brake, and the chronograph operation can be stabilized. Furthermore, the number of chronograph members can be reduced, which can contribute to reduction of processing, assembly, and management costs, effective use of design space, and downsizing of the movement size.

  Further, in the electronic timepiece having the chronograph function as described above, the hammer mechanism is composed of the initial position setting member and the hammer lever, and the initial position setting member and the hammer lever are arranged at the same height. It is desirable that

  In this case, since the transmission of force acts on the plane between the initial position setting member and the hammer, the twist of the initial position setting member and the previous hammer can be suppressed. Therefore, it is possible to reliably reduce the mechanical resistance force such as a decrease in transmission efficiency caused by twisting and excessive friction with the shaft support member, and it is possible to provide an appropriate operational feeling to the operator. In addition, since an excessive load is not applied to the member, the life of the watch can be extended.

As described above, according to the present invention, the movement size can be reduced, the design space can be made effective, the processing / assembly / management costs can be reduced, the power transmission efficiency can be improved, and the chronograph operation can be sufficiently stabilized. be able to.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a plan view of an electronic timepiece with a chronograph function according to the present invention as viewed from the back cover side, and is a plan view showing a schematic configuration of a start / stop and reset operating mechanism of the chronograph unit 100. FIG. 1 is a cross-sectional view showing a schematic configuration of the main part of FIG. 1, FIG. 3 is a plan view when the chronograph function of the electronic timepiece with chronograph function of FIG. 1 is in an inoperative state, and FIG. 4 is an electronic with chronograph function of FIG. FIG. 5 is a plan view showing the operation at the time of stopping the chronograph function of the electronic timepiece with the chronograph function in FIG. 1, and FIG. 6 is a chronograph function in FIG. It is a top view which shows the action | operation at the time of reset of the chronograph function of an attached electronic timepiece.

First, the configuration of the present invention will be described with reference to the drawings. As shown in the figure, the start / stop and reset operation mechanism of the chronograph unit 100 is configured such that the start / stop and reset are mechanically performed according to the rotation position of the operation cam 140 according to the rotation. Further, as shown in FIG. 2, the operating cam 140 is laminated so as to have two layers by two types of cams having different planar shapes, and the cross section of the operating cam 140 is composed of a lower layer 141, a middle layer 142, and an upper layer 143. It is a cylindrical composite cam broken down into the functions of two layers. Fourteen teeth 141a having a constant pitch are provided on the side surface of the lower layer portion 141, seven teeth 142a having a constant pitch are provided on the side surface of the middle layer portion 142, and the same pitch as the teeth 142a is provided on the side surface of the upper layer portion 143. 7 teeth 143a are provided. In this embodiment, the operation cam 140 is stacked so as to have two layers by two types of cams having different planar shapes. However, it is obvious that the operation cam 140 may be configured to have three layers by three types of cams. It is.

  101 is a start / stop button which is a start / stop switching operation member for operating and stopping the chronograph mechanism, and 152 is a start / stop lever which is a start / stop operation transmitting member which is operated by the start / stop button 101. The operation cam jumper 151 locked to the lower layer part 141 regulates the rotational phase (position) when stationary, and the operation cam pressing part 152a provided on the start / stop lever 152 is operated by the operation of the start / stop lever 152. The cam 140 is rotated clockwise.

  121 is a 1/5 second chronograph wheel to which a 1/5 second chronograph hand (not shown) is fixed, 123 is a 1/5 second chronograph intermediate wheel (1), and 124 is a 1/5 second chronograph intermediate wheel (2 , 301 is a rotor which is an output of a step motor (not shown); rotor 301, 1/5 second chronograph intermediate wheel (2) 124, 1/5 second chronograph intermediate wheel (1) 123, 1/5 second. The chronograph wheel 121 constitutes a 1/5 second chronograph train.

  111 is a minute chronograph wheel to which a minute chronograph hand (not shown) is fixed, 113 is a minute chronograph intermediate wheel (1), 114 is a minute chronograph intermediate wheel (2), 115 is a minute chronograph intermediate wheel (3) Rotor 301, 1/5 second chronograph intermediate wheel (2) 124, minute chronograph intermediate wheel (3) 115, minute chronograph intermediate wheel (2) 114, minute chronograph intermediate wheel (1) 113, minute chronograph A minute chronograph train wheel is constituted by the graph wheel 111.

  Reference numeral 131 denotes an unillustrated hour chronograph wheel when the chronograph hand is fixed, 133 denotes an hour chronograph intermediate wheel (1), 134 denotes an hour chronograph intermediate wheel (2), and 135 denotes an hour chronograph intermediate wheel (3). 136 is the hour chronograph intermediate wheel (4), rotor 301, 1/5 second chronograph intermediate wheel (1) 123, hour chronograph intermediate wheel (4) 136, hour chronograph intermediate wheel (3) 135, hour The chronograph intermediate wheel (2) 134, the hour chronograph intermediate wheel (1) 133, and the hour chronograph wheel 131 constitute an hour chronograph wheel train.

[Chronograph start / stop operation mechanism]
Next, the start / stop operation mechanism of the electronic timepiece with a chronograph function according to the present invention will be described with reference to FIGS. (Note that FIG. 3 shows the chronograph function inoperative). The start / stop mechanism includes an operation cam 140, an operation cam jumper 151 that regulates the rotational position of the operation cam 140, and a start / stop button that is a start / stop switching operation member that performs an operation operation and a stop operation of the chronograph mechanism. 101, a start / stop lever 152 that is a start / stop operation transmission member that is operated by the start / stop button 101, a start / stop lever return spring 153, and a chronograph train wheel stop member that stops a part of the chronograph train wheel. A chronograph stop lever (1) 154, a transmission lever 155 as an initial position setting member for moving a hammer mechanism for performing a hammer of a chronograph pointer, which will be described later, to a standby position, and a hammer (1 ) 156, hammer (2) 157, hammer return spring 158, and chronograph pointer to be described later. A restriction lever 159 that is a restriction member for releasing the restriction of the hammer mechanism, and a switching lever 160 that is a state detection member of a safety mechanism that detects a start state of the chronograph pointer and prevents a hammer operation due to an erroneous operation of the hammer operation member. A switching lever return spring 161, a chronograph stop lever (2) 162 that is a chronograph train stop member for stopping a part of the chronograph train, a restricting vehicle (1) 163, and a restricting vehicle (2) 164.

The start / stop lever 152 is provided with a start / stop button pressing portion 152b configured in a bent state at one end, a semi-elliptical opening 152c, and a pin 152d, and an operating cam pressing portion 152a at the other end. Is provided. The start / stop lever 152 follows the shape of the opening 152c around the pin 201 provided on the movement side by engaging the start / stop lever return spring 153 with the pin 152d provided on the start / stop lever 152. Reciprocate.

  The chronograph stop lever (1) 154 comes into contact with a pattern formed on the circuit board 202 on which one end is mounted with a control unit for electrically controlling the chronograph train wheel, and sends a start signal to the control unit. An electric contact lever portion 154a configured in a bent state to be fed, a detection lever portion 154b for detecting the state of the operation cam 140 at the other end portion and meshing with the upper layer portion 143 of the operation cam 140, and a detection lever portion 154b at the center portion. Return spring portion 154c for stably pressing the brake, and a brake portion 154d for braking the 1/5 second chronograph intermediate wheel (2) 124 which has a spring portion at the other end and is part of the chronograph wheel train. Are integrally formed, and are configured to rotate about a pin 203 provided on the movement side. Therefore, the chronograph stop lever (1) 154 is configured as an electrical switching mechanism of the chronograph function, with the electrical contact lever portion 154a repeatedly contacting and non-contacting with the pattern on the circuit board 202 by its rotational movement. The brake portion 154d is configured as a braking mechanism for the chronograph wheel train.

  The transmission lever 155 has a meshing portion 155a with the upper layer portion 143 of the operating cam 140 at one end portion and a pressing portion 155b with the hammer (1) 156 at the other end portion, and is provided on the movement side. The pin 204 is rotated about the axis.

  The hammer (1) 156 is arranged at the same height as the transmission lever 155, a pressing portion 156a with the transmission lever 155 at one end, a pressing portion 156b with the hammer return spring 158 at the other end, It has a hooking part 156c with the regulating lever 159. Further, a pin 156d is provided and is inserted into a slot 157a of a hammer (2) 157 described later. Further, it has a hammer portion 156e for returning the minute chronograph heart cam 112 and a hammer portion 156f for returning the 1/5 second chronograph heart cam 122, and a pin 205 provided on the movement side is pivoted. As a result, the chronograph pointer is returned to zero.

  The hammer (2) 157 has a parallel two-stage bend at one end, and further has an elongated hole 157a to which the pin 156d of the hammer (1) 156 is locked. The other end portion has a hammer portion 157b for returning the hour chronograph heart cam 132, performs a rotational motion around the pin 206 provided on the movement side, and returns the chronograph pointer to zero.

  The regulating lever 159 has a pressing portion 159a at one end portion, and the pressing portion 159a is always pressed in the direction A by the side pressure spring 207 provided on the movement side, and the pin 208 provided on the movement side is A rotational force is applied counterclockwise as the rotation axis. The other end portion has a hooking portion 159b with the hammer (1) 156, and plays a role of a trigger in a transition stage from a stop state to a reset state, which will be described later.

  An example of the operation of the chronograph start / stop operation mechanism having the above-described configuration will be described with reference to FIGS. 3 to 5 separately for the chronograph function non-operation, start, stop, and restart. .

[Chronograph stop state]
In the state of FIG. 3, the detection lever portion 154b of the chronograph stop lever (1) 154 is pressed by the upper layer portion 143 of the operating cam 140, and the electric contact lever portion 154a is not in contact with the pattern on the circuit board 202. (Non-contact state), there is no electrical input for the chronograph function. The brake unit 154d laterally presses and brakes the 1/5 second chronograph intermediate wheel (2) 124 (the brake is applied).

  In the hammer (1) 156, the elastic force in the B direction shown in the figure due to the initial deflection of the hammer return spring 158 is applied to the pressing portion 156b, and the rotational force is applied in the counterclockwise direction about the pin 205 as the rotation axis. The hammer portion 156e is the minute chronograph heart cam 112, the hammer portion 156f is the 1/5 second chronograph heart cam 122, the pressing portion 156a is the pressing portion 155b of the transmission lever 155, and the pin 156d is the hammer of the hammer (2) 157. The long hole portion 157a is pressed.

  Accordingly, the hammer (2) 157 receives a rotational force in the clockwise direction about the pin 206 as a rotation axis by the engagement between the substantially elongated hole 157a and the pin 156d provided on the hammer (1) 156. The hammer portion 157d presses the hour chronograph heart cam 132.

  When the transmission lever 155 is pressed by the hammer (1) 156, a clockwise rotational force is applied to the pressing portion 155b. At this time, the meshing portion 155a is located between the two teeth 143a and the teeth 143a of the upper layer portion 143 of the operating cam 140.

  The switching lever 160 is positioned between the teeth 142a and 142a of the middle layer portion 142 of the operating cam 140, the pressing portion 160a is pressed by the switching lever return spring 161, and the pin 209 provided on the movement side is used as a rotation shaft. A rotational force is applied in the clockwise direction. Further, the switching lever 160 is provided with a protrusion 160b and a protrusion 160c, and a chronograph stop lever that rotates around the pin 209 is provided in a groove-like locking portion 160d between the protrusions 160b and 160c. (2) The lower bent portion 162a of 162 is locked, the pressing portion 162b brakes the 1/5 second chronograph wheel 121 via the regulation vehicle (1) 163 (the brake is applied), and the pressing portion 162c is the regulation vehicle. (2) The minute chronograph wheel 111 is braked via 164 (the brake is applied).

[Chronograph start operation]
In order to start the chronograph function from this state, the push button pressing portion 152b of the start / stop lever 152 is pressed by the operator pressing the start / stop button 101 in the direction of the arrow A as shown in FIG. The start / stop lever 152 moves linearly along the opening 152c, applies a rotational force to the lower layer portion 141 of the operating cam 140 by the operating cam pressing portion 152a, and the operating cam 140 rotates clockwise.

  With this operation, the transmission lever 155 is pushed up in the direction of the arrow B by the upper layer portion 143 of the operating cam 140, and the transmission lever tip portion 155a moves to the top of the tooth 143a of the operating cam upper layer portion 143.

  The hammer (1) 156 is rotated in the direction indicated by the arrow C by the pressing portion 155b of the transmission lever 155 arranged at the same height, so that the minute chronograph heart cam 112 and the 1/5 second chronograph heart cam 122 return to zero. Is released, and the hammer (2) 157 is rotated in the direction of the arrow D in the figure to release the zero return state of the hour chronograph heart cam 132.

  Then, the hammer return spring 158 is displaced in the direction of the arrow E by the pressing portion 156b of the hammer (1) 156, and the stored strain energy becomes a zero return force at the time of reset.

As described above, the restriction lever 159 is pressed in the direction indicated by the arrow F by the side pressure spring 207 provided on the movement side, so that the hook portion of the restriction lever 159 enters the hook portion 156c of the hammer (1) 156, The hammer (1) 156 is regulated at the position shown in FIG.

  Further, the switching lever 160 is pushed up in the direction of the arrow G by the middle layer 142 of the operating cam 140, and the switching lever tip 160e moves to the top of the tooth 142a of the middle layer 142 of the working cam. By this operation, the locking portion 160d of the switching lever 160 rotates in the direction indicated by the arrow H in the drawing.

  Accordingly, in the chronograph stop lever (2) 162, the lower bent portion 162a is rotated in the direction of the arrow I by the latching portion 160d of the switching lever, and the pressing portion 162b is 1/5 via the regulating wheel (1) 163. The brake of the second chronograph wheel 121 is released, and the pressing portion 162c releases the brake of the minute chronograph wheel 111 via the regulation wheel (2) 164. At this time, the protrusion 160b of the switching lever 160 causes the hammer transmission lever 165 used at the time of reset to enter the path of the restriction lever pressing portion 165c, completely restricting the operation of the hammer transmission lever 165, and in the start state. It serves as a safety mechanism that disables the reset operation.

  Further, the detection lever portion 154b of the chronograph stop lever (1) 154 enters the gap between the teeth 143a and 143a of the upper layer portion 143 of the operating cam 140 by the elastic force of the return spring portion 154c, and the brake portion 154d is 1 / Leave the 5-second chronograph intermediate wheel (2) 124 and release the brake. The electrical contact lever portion 154a comes into contact with the pattern on the circuit board 202, and a start signal is input. As a result, a drive signal is input to a step motor (not shown), and the chronograph trains of 1/5 seconds, minutes, and hours are driven by the step motor, 1/5 second of a chronograph (not shown), The hands are moved to indicate the minute and hour.

  In the series of operations described above, at the start, the operator applies the finger pressing force via the start / stop button 101, the start / stop lever 152, the operation cam 140, the transmission lever 155, and the hammer (1) 156, and then returns the hammer. Must be transmitted to the spring 158. Therefore, a decrease in transmission efficiency between these members becomes a load and is added to the finger pressing force of the operator. Therefore, as in the present invention, if the transmission lever 155 and the hammer (1) 156 have the same cross-sectional height, the twisting of both members in force transmission can be suppressed, and the frictional force between the transmission lever 155 and the pin 204, A frictional force between the hammer (1) 156 and the pin 205, and a decrease in transmission efficiency between the transmission lever pressing portion 155b and the hammer pressing portion 156a can be suppressed. Therefore, the finger pressing force of the operator is efficiently transmitted to the hammer return spring 158, and as a result, an appropriate finger pressing force can be provided to the operator.

  FIG. 5 shows a state when the chronograph function is stopped. As in the start, when the start / stop button 101 is pushed in the direction of the arrow A by the operator, the start / stop button pressing portion 152b of the start / stop lever 152 is pressed, and the start / stop lever 152 is moved along the opening 152c. The actuating cam 140 is rotated clockwise by applying a rotational force to the lower layer part 141 of the actuating cam 140 by the actuating cam pressing part 152a.

  Along with this operation, the teeth 143a of the operating cam upper layer portion 143 further pushes up the distal end portion 155a of the transmission lever 155, and the distal end portion 155a enters between the teeth 143a and 143a. At this time, the pressing portion 155b of the transmission lever 155 is unloaded, and the transmission lever 155 is in a free state as a whole.

Further, the switching lever 160 rotates in the direction of the arrow B in accordance with the rotation of the operating cam 140, the pressing portion 160a is pressed by the switching lever return spring 161, and enters between the teeth 142a and 142a of the operating cam middle layer portion 142. .

  Then, due to the engagement relationship between the switching lever 160 and the chronograph stop lever (2) 162, the pressing portion 162b of the chronograph stop lever (2) 162 is connected to the 1/5 second chronograph wheel via the regulating wheel (1) 163. 121 is braked, and the pressing portion 162 c brakes the minute chronograph wheel 111 via the regulation wheel (2) 164.

  Further, the detection lever portion 154b of the chronograph stop lever (1) 154 is pushed up in the direction of the arrow C by the teeth 143a of the operating cam upper layer portion 143, and the brake portion 154d is a 1/5 second chronograph intermediate wheel (2). Contact 124 and brake. Then, the electric contact lever portion 154a is separated from the pattern on the circuit board 202 and is in a non-contact state, and the start signal is electrically cut off. As a result, the drive signal is released to the step motor (not shown), and the drive of the chronograph train wheel by the step motor for 1/5 second, minute, and hour is stopped, and 1/5 of the chronograph (not shown). The hands indicating seconds, minutes and hours are also stopped.

[Chronograph restart operation]
When shifting from this state to the restarting state, the hammer takes the same form as the starting state of FIG. 4 except that the hammer (1) 156 is previously regulated by the regulating lever 159.

[Chronograph hammering mechanism]
As shown in FIG. 6, the reset operation mechanism (return mechanism) includes the operation cam 140, the operation cam jumper 151, a reset button 102 that is a hammer operation member for performing a hammer operation of the chronograph mechanism, A hammer transmission lever 165 that is a hammer operation transmission member, a hammer (1) 156, a hammer (2) 157, a hammer return spring 158, a restriction lever 159, a switching lever 160, A switching lever return spring 161, a 1/5 second chronograph heart cam 122, a minute chronograph heart cam 112, and an hour chronograph heart cam 132 are configured.

  The hammer transmission lever 165 is provided with a reset button pressing portion 165a configured in a bent state at one end and a regulating lever pressing portion 165b at the tip of the other end. Further, a switching lever pressing portion 165c is provided at another end adjacent to the regulating lever pressing portion 165b. The hammer transmission lever 165 rotates around the pin 212 provided on the movement side as a rotation axis by engaging the return spring portion 211 provided on the movement side with the pin 165d provided on the hammer transmission lever 165. Reciprocate.

[Reset Chronograph]
The operation of the chronograph reset operating mechanism configured as described above will be described with reference to FIGS.

  As described above, in the reset operation mechanism in the start state as shown in FIG. 4 or the restart state in the same form as that shown in FIG. 4, the protrusion 160b provided on the switching lever 160 is the restriction lever of the hammer transmission lever 165. Operation becomes impossible by a safety mechanism that enters the track of the pressing portion 165c. Therefore, the reset operation can be performed only in the stop state as shown in FIG.

As shown in FIG. 6, when the reset button 102 is pressed in the direction of the arrow A by the operator and the reset button pressing portion 165a of the hammer transmission lever 165 is pressed, the hammer transmission lever 165 is moved in the direction of the arrow B. Rotate. The restriction lever pressing portion 165b rotates the restriction lever 159 in the direction of the arrow C in the figure, and the hooking portion 159b of the restriction lever 159 is the hammer (1) 15
6 is disengaged from the hook portion 156c.

  Accordingly, there is no restriction on the position of the hammer (1) 156, and the hammer (1) 156 rotates in the direction indicated by the arrow D by the restoring force of the hammer return spring 158. / 5 second chronograph heart cam 122 is returned to zero, and hammer portion 156e returns minute chronograph heart cam 112 to zero. Along with this operation, the hammer (2) 157 is rotated in the direction of the arrow E by the pin 156d provided on the hammer (1) 156, and the hammer portion 157b returns the hour chronograph heart cam 132 to zero. As a result, the hands indicating 1/5 second, minute and hour of the chronograph (not shown) are forcibly moved to the position indicating “0” of the elapsed time, and the state returns to the state of FIG.

It is a top view of the electronic timepiece with a chronograph function showing an embodiment of the present invention, and is a plan view seen from the back cover side. It is sectional drawing which shows schematic structure of the principal part of FIG. It is a top view when the chronograph function of the electronic timepiece with a chronograph function of FIG. 1 is in a non-operation state. It is a top view which shows the action | operation at the time of the start of the chronograph function of the electronic timepiece with a chronograph function of FIG. It is a top view which shows the action | operation at the time of the stop of the chronograph function of the electronic timepiece with a chronograph function of FIG. It is a top view which shows the action | operation at the time of the reset state of the chronograph function of the electronic timepiece with a chronograph function of FIG.

Explanation of symbols

100 Chronograph part 101 Start / stop button 102 Reset button 111 minute chronograph wheel 112 minute chronograph heart cam 121 1/5 second chronograph wheel 122 1/5 second chronograph heart cam 124 1/5 second chronograph intermediate wheel (2)
132 Chronograph heart cam 140 Actuating cam 151 Actuating cam jumper 152 Start / stop lever 154 Chronograph stop lever (1)
155 Transmission lever 156 Return lever (1)
157 hammer (2)
159 Regulating lever 160 Switching lever 162 Chronograph stop lever (2)
163 regulated vehicles (1)
164 Regulation vehicle (2)
165 hammer transmission lever 200 movement 202 circuit board 301 rotor

Claims (3)

A start / stop switching operation member that performs an operation operation and a stop operation of the chronograph mechanism, a start / stop operation transmission member that is operated by the start / stop switching operation member, and a plurality of teeth that are rotated by the operation of the start / stop operation transmission member An operating cam, a hammer operation member that performs a hammer operation of the chronograph mechanism, a hammer operation transmission member that is operated by the hammer operation member, and a hammer that performs a hammer return by the hammer operation transmission member An electronic timepiece having a chronograph function that controls a start, stop, and reset of a chronograph pointer according to a rotation position of the operating cam. Laminating so that there are at least two layers with different planar shapes, and disassembling the cross section of the operating cam into the functions of three layers, an upper layer, a middle layer, and a lower layer,
A start / stop operation transmission member and an operation cam jumper for restricting the rotational position of the operation cam are arranged in the lower layer of the operation cam, and a start operation of the chronograph pointer is detected in the middle layer of the operation cam. An initial position setting member of a hammer mechanism for moving a hammer mechanism to a standby position and a chronograph wheel train are arranged on the upper layer of the operation cam to prevent a hammer operation due to an erroneous operation of the member. An electronic timepiece with a chronograph function, wherein a chronograph train wheel stopping member for stopping a part of the chronograph is arranged. The chronograph train wheel stopping member is electrically connected to the operating cam, detects a state of the operating cam, a detecting lever part, a brake part that stops a part of the chronograph wheel train, and electrically An electric contact lever part that contacts a pattern formed on a circuit board on which a control unit for controlling the chronograph train is mounted and sends a start signal to the control unit, and the detection lever part is stabilized by the operating cam. 2. An electronic timepiece with a chronograph function according to claim 1, wherein a return spring portion for pressing is integrally formed. The said hammer mechanism consists of the said initial position setting member and a hammer, and the said initial position setting member and the said hammer are arrange | positioned at the same height. Electronic clock with chronograph function.

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