WO2001001203A1

WO2001001203A1 - Mechanical timepiece with timed annular balance rotating angle control mechanism

Info

Publication number: WO2001001203A1
Application number: PCT/JP1999/003488
Authority: WO
Inventors: Takeshi Tokoro
Original assignee: Seiko Instruments Inc.
Priority date: 1999-06-29
Filing date: 1999-06-29
Publication date: 2001-01-04
Also published as: EP1109081A1; CN1324457A; EP1109081A4

Abstract

A mechanical timepiece, comprising a timed annular balance rotating angle control mechanism formed so that it generates a static electricity when the rotating angle of a timed annular balance (140) comes to a specified threshold value or higher and does not generate the static electricity when it does not exceed the specified threshold value, wherein the control mechanism can be controlled so that the deflection angle of the timed annular balance comes within a specified range, whereby the mechanical timepiece becomes accurate because a variation in its rate is small even when a time elapses after it is fully wound.

Description

Description Mechanical watch with balance rotation angle control mechanism

〔Technical field〕

The present invention relates to a mechanical timepiece with a balance rotation angle control mechanism configured to apply a force to suppress the rotation of the balance with hairspring to the balance with hairspring.

(Background technology)

In a conventional mechanical timepiece, as shown in FIGS. 12 and 13, the movement (mechanical body) 110 of the mechanical timepiece has a main plate 1102 constituting a substrate of the movement. . The winding stem 111 is rotatably incorporated into the winding guide hole 111a of the main plate 111. The dial 1 104 (shown in phantom in FIG. 13) is attached to the movement 110.

In general, of the two sides of the main plate, the side with the dial is called the “back side” of the movement, and the side opposite to the side with the dial is called the “front side” of the movement. The train wheel built into the “front side” of the movement is called “front train wheel”, and the train wheel built into the “back side” of the movement is called “back train wheel”.

The axial position of the winding stem 1 1 1 0 is determined by a switching device that includes the setting 1 1 9 0, the bar 1 1 92, the spring 1 1 94, and the back 1 1 96. The wheel 1 1 1 2 is rotatably provided on the guide shaft of the winding stem 1 1 1 0. When the winding stem 1 11 0 is rotated in a state where the winding stem 1 110 is located at the first winding stem position (the 0th stage) closest to the inside of the movement along the rotation axis direction, The wheel 1 1 1 2 rotates through the rotation of the wheel. The round hole wheel 1 1 1 4 is rotated by the rotation of the wheel 1 1 1 2. The square wheel 1 1 16 rotates with the rotation of the round wheel 1 1 14. When the square wheel 1 1 1 6 rotates, the mainspring 1 1 22 housed in the barrel box 1 1 20 is wound up. The second wheel 1 1 24 is rotated by the rotation of the barrel 1 1 20. The escape wheel 1 1 30 rotates through the rotation of the 4th wheel 1 1 28, the 3rd wheel 1 1 2 6, and the 2nd wheel 1 1 24. The barrel car 1 120, the second wheel 1 1 24, the third wheel 1 1 26, and the fourth wheel 1 1 28 constitute a front wheel train.

The escapement / governing device for controlling the rotation of the front train wheel includes a balance 1140, an escape wheel 1130, and an ankle 1142. The balance 1140 includes a balance 1140a, a balance wheel 114Ob, and a hairspring 1140c. Based on the rotation of the second wheel & pinion 1 1 24, the cannon pinion 1 1 50 rotates simultaneously. The minute hand 1 152 attached to the tube pinion 1 1 50 indicates “minute”. The cylinder pinion 1 150 is provided with a slip mechanism for the second wheel 1 1 24. Based on the rotation of the cannon pinion 1 150, the hour wheel 1 1 54 rotates through the rotation of the minute wheel. The hour hand 1 156 attached to the hour wheel 1 1 54 indicates "hour".

The barrel car 1 120 is rotatably supported with respect to the main plate 1 102 and the barrel holder 1 160. The second wheel 1 1 24, the third wheel 1 1 2 6, the fourth wheel 1 1 28, and the escape wheel 1 1 30 are rotatable with respect to the main plate 1 102 and the train wheel bridge 1 1 62. Supported. The ankle 1142 is supported so as to be rotatable with respect to the main plate 1 102 and the ankle receiver 1 164. The balance with hairspring 1 140 is supported so as to be rotatable with respect to the main plate 1 102 and the balance with hairspring 1 1 6 6.

The hairspring 1 140c is a thin leaf spring in a spiral shape with multiple windings. The inner end of the hairspring 1 140 c was fixed to the beard ball 1 140 d fixed to the balance 1 140 a, and the outer end of the hairspring 1 140 c was fixed to the balance 1 1 6 6 It is fixed by screwing through the beard holder 1 170a attached to the beard holder 1 170. A speed / recess needle 1 16 8 is rotatably mounted on the balance with hairspring 1 1 6 6. The whiskers 1 3 4 0 and the whiskers 1 3 4 2 are attached to the needle 1 1 6 8. A portion near the outer end of the beard is located between the beard holder and the beard bar.

In general, in a typical conventional mechanical watch, as shown in Fig. 8, the mainspring torque is gradually increased as the mainspring is unwound from a state in which the mainspring is completely wound up (full winding state) and the duration elapses. Decreases. For example, in the case of Fig. 8, the mainspring torque is about 27 g'cm in the fully wound state, becomes about 23 gcm after 20 hours from the fully wound state, and is 4 g from the fully wound state. Approximately 18 g · cm after 0 hours.

Generally, in a typical conventional mechanical timepiece, as shown in Fig. 9, when the mainspring torque decreases, the swing angle of the balance with hairspring also decreases. For example, in the case of Fig. 9, when the mainspring torque is 25 to 28 cm, the swing angle of the balance with hairspring is about 240 to 270 degrees, and the mainspring torque is 20 to 25 g In cm, the swing angle of the balance with hairspring is about 180 to 240 degrees.

Referring to FIG. 10, there is shown a transition of an instantaneous rate (a numerical value indicating the precision of a watch) with respect to a swing angle of a balance with a typical conventional mechanical timepiece. Here, the "instantaneous rate" is defined as "when the mechanical watch is left for one day while maintaining the state and environment, such as the swing angle of the balance when measuring the rate, The rate value indicating the advance or delay of a mechanical watch. In the case of FIG. 10, when the swing angle of the balance with hairspring is 240 degrees or more, or 200 degrees or less, the instantaneous rate is delayed. For example, in a typical conventional mechanical timepiece, as shown in Fig. 10, when the swing angle of the balance with hairspring is about 200 to 240 degrees, the instantaneous rate is about 0 to 5 seconds / day. However, when the swing angle of the balance with hairspring is about 170 degrees, the instantaneous rate is about 20 seconds / day (about 20 seconds behind each day) . FIG. 11 shows the transition of the elapsed time and the instantaneous rate when the mainspring is rewinded from the fully wound state in a typical conventional mechanical timepiece. Here, in conventional mechanical watches, the “rate”, which indicates the advance or the delay of the watch per day, is the elapsed time when the mainspring is unwound from the entire winding, as indicated by the fine line in Fig. 11. It is obtained by integrating the instantaneous rate for 24 hours.

In general, in a conventional mechanical timepiece, as the mainspring is unwound from the fully wound state and the duration time elapses, the mainspring torque decreases and the swing angle of the balance with hairspring decreases, so that the instantaneous rate is delayed. For this reason, in the case of a conventional mechanical watch, the momentary rate when the mainspring is fully wound is advanced in advance in anticipation of the delay of the watch after the duration of 24 hours has elapsed, and the clock per day It was adjusted in advance so that the “rate” indicating the advance of the watch or the delay of the clock became positive.

For example, in a typical conventional mechanical timepiece, as shown by the fine line in Fig. 11, the instantaneous rate is about 3 seconds / day in the fully wound state (approximately 3 seconds per day). After 20 hours from the winding state, the instantaneous rate is about 3 seconds / day (about 3 seconds behind each day), and after 24 hours from the full winding state, the instantaneous rate is about 8 seconds / day. (Approx. 8 seconds late per day), after 30 hours from full winding, the instantaneous rate is about 16 seconds Z days (approximately 16 seconds late per day).

A conventional balance angle adjusting device for a balance with hairspring is provided with a swing angle adjusting plate that applies a braking force to the balance with an overcurrent generated each time the magnet of the balance approaches and swings. It is disclosed in Japanese Patent Application Publication No. 544-141675.

An object of the present invention is to provide a mechanical timepiece provided with a balance rotation angle control mechanism that can control a swing angle of a balance with hairspring to fall within a certain range.

It is a further object of the present invention to provide a highly accurate mechanical timepiece with a small change in the rate even after a lapse of time from the fully wound state. [Disclosure of the Invention]

The present invention relates to a mainspring constituting a power source of a mechanical timepiece, a front train wheel that rotates by a rotational force when the mainspring is unwound, and an escapement / governing device for controlling the rotation of the front train wheel. This escapement and speed governing device has a balance that rotates clockwise and counterclockwise, an escape wheel that rotates based on the rotation of the front train wheel, and an escape wheel that rotates based on the operation of the balance. A mechanical watch that is configured to include an ankle for controlling the balance, and when the rotation angle of the balance with hairspring exceeds a predetermined threshold or value, static electricity is generated, and the rotation angle of the balance with hairspring reaches a predetermined threshold. The balance is characterized by having a balance with hairspring rotation angle control mechanism configured to prevent generation of static electricity when the rotation speed does not exceed.

In the mechanical timepiece of the present invention, the balance rotation angle control mechanism includes a balance spring insulating plate provided on the balance with hair, and a ground plate insulating plate disposed on the ground plate. There is a gap between them.

Further, in the mechanical timepiece of the present invention, the balance with hairspring rotation angle control mechanism is mounted on a switch lever rotatably mounted on the balance with hairspring and rotatably mounted on the switch lever, and operates in contact with the hairspring. And a contact member for determining the position of the hairspring switch member, the rotation of the hairspring switch member causes a balance between the balance spring insulating plate and the base plate insulating plate. It is preferable to configure so that the generation of static electricity can be controlled.

By using the balance rotation angle control mechanism configured as described above, the rotation angle of the balance with the mechanical watch can be effectively controlled, thereby improving the accuracy of the mechanical watch.

[Brief description of drawings]

FIG. 1 is a plan view showing a schematic shape of a front side of a movement of a mechanical timepiece of the present invention. Yes (in Fig. 1, some parts are omitted, and the receiving member is shown with phantom lines).

FIG. 2 is a schematic partial cross-sectional view of the movement of the mechanical timepiece of the present invention (in FIG. 2, some parts are omitted).

FIG. 3 is an enlarged partial plan view showing a schematic shape of a balance portion of a mechanical timepiece of the present invention in a state where a circuit is closed.

FIG. 4 is an enlarged partial sectional view showing a schematic shape of a balance portion of the mechanical timepiece of the present invention in a state where a circuit is closed.

FIG. 5 is an enlarged partial plan view showing a schematic shape of a balance portion of a mechanical timepiece of the present invention in a state where a circuit is open.

FIG. 6 is an enlarged partial sectional view showing a schematic shape of a balance portion of a mechanical timepiece according to the present invention in a state where a circuit is open.

FIG. 7 is a block diagram showing the operation when the circuit is open and the operation when the circuit is closed in the mechanical timepiece of the present invention.

FIG. 8 is a graph schematically showing the relationship between the elapsed time of unwinding from a full turn and a mainspring torque in a mechanical timepiece.

FIG. 9 is a graph schematically showing a relationship between a swing angle of a balance with hairspring and a mainspring torque in a mechanical timepiece.

FIG. 10 is a graph schematically showing the relationship between the swing angle of the balance with hair and the instantaneous rate in a mechanical timepiece.

FIG. 11 is a graph schematically showing the relationship between the elapsed time and the instantaneous rate from the entire winding in the mechanical timepiece of the present invention and the conventional mechanical timepiece.

FIG. 12 is a plan view showing a schematic shape of a front side of a movement of a conventional mechanical timepiece (in FIG. 12, some parts are omitted, and a receiving member is indicated by an imaginary line). FIG. 13 is a schematic partial cross-sectional view of a movement of a conventional mechanical timepiece (some parts are omitted in FIG. 13). [Best mode for carrying out the invention]

An embodiment of a mechanical timepiece according to the present invention will be described below with reference to the drawings.

Referring to FIG. 1 and FIG. 2, in an embodiment of the mechanical timepiece of the present invention, a movement (mechanical body) 300 of the mechanical timepiece has a main plate 102 constituting a substrate of the movement. The winding stem 110 is rotatably incorporated into the winding stem guide hole 102a of the main plate 102. Dial 104 (shown in phantom in FIG. 2) is attached to movement 300.

The winding stem 110 has a corner and a guide shaft. A thumbwheel (not shown) is installed at the corner of the winding stem 110. The ratchet wheel has the same rotation axis as that of the winding pin 110. That is, the ratchet wheel has a square hole, and is provided so as to rotate based on the rotation of the winding stem 110 by fitting the square hole into the corner of the winding stem 110. The ratchet wheel has insteps and teeth. The instep is located at the end of the ratchet wheel closer to the center of the movement 300. The second tooth is located at the end of the wheel that is closer to the outside of the element 300.

Movement 300 is provided with a switching device for determining the position of winding stem 110 in the axial direction. The switching device includes a setting lever 190, a latch 1992, a latch spring 1994, and a back retainer 1996. The position of the winding stem 110 in the rotation axis direction is determined based on the rotation of the setting lever 190. Determine the position of the pinwheel in the direction of the rotation axis based on the rotation of the bolt 19. Based on the rotation of the setting lever 190, the bolt 1992 is positioned at two positions in the rotation direction.

The wheel 1 1 2 is rotatably provided on the guide shaft of the winding stem 110. The winding stem 1 110 is the first winding stem position closest to the inside of the movement 300 along the direction of the rotation axis.

When the winding stem 110 is rotated in the state of (0th stage), the wheel 112 is rotated through the rotation of the continuous wheel. The round hole car 1 1 4 turns the car 1 1 2 Is configured to rotate. The square hole wheel 1 16 is configured to rotate by the rotation of the round hole wheel 114.

The movement 300 uses a mainspring 122 housed in a barrel car 120 as a power source. The mainspring 1 2 2 is made of an elastic material having a spring property such as iron. The configuration is such that the mainspring 1 2 2 can be wound up by rotating the square wheel 1 1 6.

The second wheel & pinion 124 is configured to rotate by the rotation of the barrel wheel 120. The third wheel 1 2 6 is configured to rotate based on the rotation of the second wheel 1 2 4. 4th car

1 2 8 is configured to rotate based on the rotation of the third wheel 1 2 6. Escape wheel

130 is configured to rotate based on the rotation of the fourth wheel & pinion 128. The barrel car 1 2 0, the second wheel 1 2 4, the third wheel 1 2 6 and the fourth wheel 1 2 8 constitute a front wheel train.

Movement 300 is provided with an escape / governing device for controlling the rotation of the front train wheel. The escapement and governor operate the balance wheel 140, which rotates clockwise and counterclockwise at regular intervals, the escape wheel 1330, which rotates based on the rotation of the front train wheel, and the balance wheel 140, And an ankle 142 for controlling the rotation of the escape wheel 130 based on the

The balance 140 includes a balance 140a, a balance wheel 140b, and a hairspring 144c. The hairspring 140 c is made of a resilient material having a spring property such as “Erinba”. That is, the hairspring 140c is made of a metal conductive material.

Based on the rotation of the second wheel & pinion 1, 24, the cylindrical pinion 150 rotates simultaneously. The minute hand 152 attached to the cylindrical pinion 150 is configured to display "minute". The cannon pinion 150 is provided with a slip mechanism having a predetermined slip torque with respect to the center wheel & pinion 124.

The minute wheel (not shown) rotates based on the rotation of the cannon pinion 150. The hour wheel 154 rotates based on the rotation of the minute wheel. Hour hand 1 5 attached to hour wheel 1 5 4 6 is configured to display the hour.

The barrel barrel 120 is supported rotatably with respect to the main plate 102 and barrel barrel 160. The second wheel 1 2 4, the third wheel 1 2 6, the fourth wheel 1 2 8, and the escape wheel 1 330 are supported so that they can rotate with respect to the main plate 10 2 and the train wheel bridge 16 2 Is done. The ankle 142 is supported rotatably with respect to the main plate 102 and the ankle receiver 164. The balance with hairspring 140 is rotatably supported with respect to the main plate 102 and the balance with hairspring 166. In other words, the upper bell 140 a 1 of the balance 140 a is supported rotatably with respect to the balance upper bearing 166 a fixed to the balance holder 166. The balance-top bearing 1 66 a includes a balance-top stone and a balance-top stone. Top hole stones and top stones are made of insulating materials such as ruby.

The lower border 140a2 of the balance 140a is rotatably supported with respect to the balance lower bearing 102b fixed to the main plate 102. The balance wheel bearing 102b includes a balance hole stone and a balance stone. Hypothetical pits and trowels are made of insulating materials such as ruby.

The hairspring 140 c is a thin leaf spring having a spiral shape with a plurality of turns. The inner end of the hairspring 140 c is fixed to a beard ball 140 d fixed to a balance 140 a, and the outer end of the hairspring 140 c is a balance 16 1 It is fixed with screws via a beard holder 170a attached to a beard holder 170 rotatably fixed to the shaft. The balance 1 166 is made of a metal conductive material such as brass. Beard support 170 is made of a metal conductive material such as iron.

Next, the balance rotation angle control mechanism of the mechanical timepiece according to the present invention will be described. Referring to FIGS. 1 to 4, the switch lever 168 is rotatably mounted on the balance with hairspring 166. The first-degree contact member 340 and the second-degree contact member 342 are attached to the switch lever 168. The switch lever 168 is attached to the balance with hairspring 166, and is mounted so as to be rotatable around the rotation center of the balance with hairspring 140. The switch lever 168 is made of a plastic insulating material such as polycarbonate. The switch lead board 310 is disposed on the switch lever 168. The switch lead substrate 310 has a switch pattern 310a. The switch lead substrate 310 is composed of, for example, a double-sided substrate having a copper foil pattern on both sides, and the switch pattern 310a is made to conduct copper foil patterns provided on both sides by through-hole plating. Is formed. As a modification, a switch pin made of a conductive material such as brass may be provided instead of the switch pattern 310a.

The first contact member 340 and the second contact member 342 penetrate the switch lead board 310 and are fixed to the switch lever 168. It is preferable that the first-degree member 340 and the second-degree member 342 be made of a metal such as brass. The first contact member 340 and the second contact member 342 may be made of plastic. The hairspring switch member 3 1 2 is attached to the switch lever 1 168. The hairspring switch member 312 is made of a conductive material, and is preferably made of, for example, a metal such as brass. The hairspring switch member 312 is in a state where it is electrically connected to the switch pattern 3110a of the switch lead substrate 310 and in a state where it is not electrically connected to the switch pattern 3110a of the switch lead substrate 310. It is rotatably mounted on switch lever 168 so that it can assume two states. That is, in a state where the hairspring switch member 312 rotates and comes into contact with the first contact member 3440 or the second contact member 342, the hairspring switch member 312 is connected to the switch lead board 310. It is configured so as not to conduct with the switch pattern 3110a.

The hairspring switch member 3 1 2 is a hairspring receiving portion formed in a groove shape to receive a portion 140 c near the outer end of the hairspring 140 c.

With 3 1 2 h. The portion 140 ct near the outer end of the hairspring 140 c is located in the groove of the hairspring receiving portion 312 h. Hairspring 1 4 0 c The portion 140 ct near the outer end is in contact with the hairspring switch member 312.

The base plate insulating substrate 320 is fixed to the front surface of the base plate 102 by bonding or the like with a part thereof facing the base plate side surface of the balance wheel 140b. The base plate insulating substrate 320 is made of an insulating material such as polyimide. The base plate insulating plate 32 2 is attached to the front surface of the base plate insulating substrate 320 by bonding or the like so that a part thereof faces the base plate side surface of the balance wheel 14 Ob. The base plate insulating plate 3222 has a ring-like planar shape and is made of an insulating material such as polyimide, polycarbonate, and polyethersulfone. In addition, the base plate insulating plate 3 222 is formed in such a shape that the escape wheel 13 ◦ and the ankle 144 are shaded.

The balance insulating plate 3 2 4 is attached to the side of the base plate of the balance wheel 140 b so as to face the front surface of the base plate insulating plate 3 2 2. The balance insulating plate 324 has a ring-shaped planar shape and is made of an insulating material such as polyimide, polycarbonate, and polyethersulfone. The plane shape of the balance insulating plate 324 is substantially the same as the plane shape of the ground plate insulating plate 322, or is formed smaller than the plane shape of the ground plate insulating plate 322. The balance insulated plate 3 24 has a balance with one surface in contact with the ring-shaped rim of the balance wheel 14 Ob and the other surface facing the front surface of the base plate insulated plate 3 22. It is fixed to the surface of the 14 Ob on the base plate side by bonding or the like.

A gap is provided between the base plate insulating plate 3 22 and the balance balance insulating plate 3 24. The gap between the base plate insulation plate 3 2 2 and the balance insulation plate 3 2 4 is generated by the rotation of the balance wheel 140 b, the static electricity between the ± plate insulation plate 3 2 2 and the balance insulation plate 3 2 4 Is determined to be able to occur.

The resistor 3226 is attached to the front surface of the base plate insulating substrate 320 by bonding or the like. The resistance 326 is, for example, 100 ohm to 1 kohm. If the value of this resistor is too small, sparks will be scattered, and if the value of this resistor is too large, the brake will be applied too much. The value of this resistance can be calculated from the electrostatic force and the required braking force.

A first lead wire 330 is provided so as to connect one terminal of the resistor 326 to the switch pattern 310a of the switch lead board 310. When the rotation angle of the balance with hairspring 140 is smaller than a predetermined angle, the switch pattern 3100a is electrically connected to the hairspring switch member 312. The second lead wire 332 is provided so as to connect the ground plate insulating plate 3222 with the beard holder 170a. The third lead wire 334 is provided so as to connect the ground plate insulating plate 322 with the other terminal of the resistor 326. In FIGS. 2, 4 and 6, the thickness of the hairspring 140c (the thickness in the radial direction of the balance with hairspring) is exaggerated, but is, for example, 0.021 mm. A certain balance-spring insulating plate 324 has, for example, an outer diameter of about 9 millimeters, an inner diameter of about 7 millimeters, and a thickness of about 1 millimeter. The base plate insulating plate 322 has, for example, an outer diameter of about 10 mm, an inner diameter of about 6 mm, and a thickness of about 1 mm. The gap S T C between the base plate insulating plate 3 2 2 and the balance insulating plate 3 2 4 is, for example, about 0.4 mm.

Next, with reference to FIGS. 3, 4, and 7, the operation of the balance 140 when the circuit is closed will be described.

The hairspring 140 c expands and contracts in the radial direction of the hairspring 140 c according to the rotation angle of the balance 140. For example, in the state shown in FIG. 3, when the balance 140 rotates clockwise, the hairspring 140 c contracts in a direction toward the center of the balance 140, whereas the balance 14 4 As 0 rotates counterclockwise, the hairspring 140 c expands away from the center of the balance 140.

Therefore, in FIG. 4, when the balance 140 rotates in the counterclockwise direction, the portion 140 ct of the hairspring 140 c close to the outer end portion is formed by the hairspring switch member. Acts to make contact with the outside of the groove of the hairspring receiving part of 312 h. When the balance 140 rotates clockwise, the portion 140 ct of the hairspring 140 c close to the outer end portion receives the hairspring receiving portion 3 1 2 of the hairspring switch member 3 1 2. Acts to contact the inside of the groove of h.

If the rotation angle (swing angle) of the balance 140 is below a certain threshold value, for example, less than 180 degrees, the amount of expansion and contraction of the hairspring 140c in the radial direction is small. The hairspring 1 4 0 c is in contact with the hairspring receiving part 3 1 2 h of the hairspring switch member 3 1 2, and the hairspring switch member 3 1 2 is the switch lead board 3 1 0 switch pattern 3 1 It remains conductive with 0a.

Therefore, when the swing angle of the balance 140 is within the range of more than 0 degrees and less than 180 degrees, the outer portion of the hairspring receiving portion 3 1 2 h of the hairspring switch member 3 1 2 is Neither does it contact the first contact member 340, nor does it contact the second contact member 342.

In this state, the ground plate insulating plate 3 2 2 is electrically connected to the hairspring 140 c and the beard holder 170 a via the resistor 3 26. As a result, since the ground plate insulating plate 3 2 2 is in a short-circuit state, even if the balance with hairspring 140 rotates, static electricity is not generated between the ground plate insulating plate 3 2 2 and the balance plate insulating plate 3 2 4. Absent.

Next, with reference to FIGS. 5, 6, and 7, the operation of the balance 140 when the circuit is open will be described. That is, FIGS. 5 and 6 show the case where the swing angle of the balance with hairspring 140 is 180 degrees or more.

In FIG. 6, the thickness of the hairspring 140 c (the thickness in the radial direction of the balance with hairspring) is exaggerated.

If the rotation angle (swing angle) of the balance 140 is a certain threshold value, for example, 180 degrees or more, the amount of expansion and contraction of the hairspring 140c in the radial direction becomes sufficiently large. 2, hairspring 1 4 0 c is the hairspring switch member 3 1 2 beard The groove of the spring receiving portion 312h is pushed outward or inward, and the hairspring switch member 312 rotates, so that conduction with the switch pattern 310a of the switch lead substrate 310 is stopped. Then, the outer portion of the hairspring receiving portion 312h of the hairspring switch member 312 is brought into contact with the first contact member 340 and the second contact member 342 to be positioned.

In such a state, since the ground plate insulating plate 3222 is not short-circuited, static electricity is generated between the ground plate insulating plate 3222 and the balance insulating plate 3224. This static electricity exerts a force on the balance with hairspring 140 to suppress the rotational movement of the balance with hairspring 140. Then, by this action, a balance brake force for suppressing the rotation of the balance with hairspring 140 is applied to reduce the swing angle of the balance with hairspring 140.

When the swing angle of the balance 140 exceeds 0 ° and decreases to a range of less than 180 °, the rotation angle of the hairspring switch member 3 1 2 decreases, and the hairspring switch member 3 1 Numeral 2 leads to the switch pattern 31 1 a of the switch lead substrate 310. Then, as shown in FIGS. 3 and 4, the base plate insulating plate 3 2 2 is in a short-circuited state, so that even if the balance 140 rotates, the base plate insulating plate 3 2 2 and the balance plate insulating plate 3 2 4 No static electricity is generated between them.

In the mechanical timepiece of the present invention configured as described above, the rotation angle of the balance 140 can be efficiently controlled.

As described above, the present invention provides a balance with a balance with an escapement / governing device that repeats clockwise and counterclockwise rotation, an escape wheel and wheel that rotates based on the rotation of a front train wheel, and In a mechanical timepiece configured to include an ankle for controlling the rotation of the wheel, a configuration having a balance rotation angle control mechanism is employed, so that the mechanical timepiece can be operated without reducing the duration of the mechanical timepiece. Accuracy can be improved.

That is, in the present invention, attention is paid to the correlation between the instantaneous rate and the swing angle, and by keeping the swing angle constant, the change in the instantaneous rate is suppressed. I adjusted so that I could advance and reduce the delay.

In contrast, in conventional mechanical watches, the swing angle changes over time due to the relationship between the duration and the swing angle. Furthermore, the instantaneous rate changes over time due to the relationship between the swing angle and the instantaneous rate. For this reason, it was difficult to maintain a certain level of accuracy and to extend the duration of the clock.

Next, the result of a simulation on the instantaneous rate performed on the mechanical timepiece of the present invention developed to solve the problem of such a conventional mechanical timepiece will be described. First, the watch is adjusted to a state in which the instantaneous rate of the watch is advanced, as shown by the X-marked plot and the thin line in Fig. 11. In the mechanical timepiece of the present invention, when the balance with hairspring 140 rotates by a certain angle or more, the outer portion of the hairspring receiving member 3 1 2 h of the hairspring switch member 3 1 2 is a member 3 4 per first degree. Since the effective length of the hairspring 140c is shortened by being positioned in contact with the 0 and the second degree contact member 342, the instantaneous rate is further enhanced.

In the mechanical timepiece of the present invention, the outer portion of the hairspring receiving member 312h of the hairspring switch member 312 is separated from the first-degree member 3400 and the second-degree member 342. When the mainspring is completely wound up, the rate is about 18 seconds / day (approximately 18 seconds per day), as shown by the X-marked plot and the thin line in Fig. 11. After 20 hours from the state, the instantaneous rate is about 13 seconds / day (advanced about 13 seconds per day), and after 30 hours from the fully wound state, the instantaneous rate is about _2 seconds / day ( About 2 seconds late per day).

In this mechanical timepiece of the present invention, assuming that the balance rotation angle control mechanism is not operated, as shown in FIG. 11 by a triangular plot and a bold line, the balance spring switch member 3 1 2 When the outer part of the receiving part 3 1 2 h is positioned in contact with the first-degree member 3 40 and the second-degree member 3 42, the rate is about 25 with the mainspring fully wound up. Seconds / day (one day After about 20 seconds from the full winding state, the instantaneous rate becomes about 20 seconds / day (about 20 seconds per day), and instantly after 30 hours from the full winding state. The rate is about 5 seconds / day (about 5 seconds a day).

On the other hand, in the mechanical timepiece of the present invention, when the balance rotation angle control mechanism is operated, as shown by a black circle plot and a thick line in FIG. 11, the balance rotation angle control mechanism is operated, In other words, from the state where the mainspring is completely wound up, until the elapse of 27 hours, the instantaneous rate can be maintained for about 5 seconds Z days (maintain the state advanced for about 5 seconds per day). After 30 hours from the winding state, the instantaneous rate is about -2 seconds / day (about 2 seconds behind each day).

The mechanical timepiece having the balance with hairspring rotation angle control mechanism of the present invention controls the instantaneous rate of the timepiece by controlling the swing angle of the balance with hairspring, so that a square plot and a virtual line are shown in FIG. 11. Compared with the conventional mechanical timepiece shown in the figure, the elapsed time from the entire winding with an instantaneous rate of about 0 to 5 seconds / day can be extended.

That is, in the mechanical timepiece of the present invention, the duration at which the instantaneous rate is within about ± 5 seconds / day is about 32 hours. The value of this duration is about 1.45 times the duration of about 22 hours, in which the instantaneous rate of a conventional mechanical watch is within about ± 5 seconds / day.

Therefore, a simulation result was obtained in which the mechanical timepiece of the present invention was much more accurate than the conventional mechanical timepiece.

[Industrial applicability]

The mechanical timepiece of the present invention has a simple structure and is suitable for realizing a highly accurate mechanical timepiece.

6

Claims

The scope of the claims

1. The mainspring that constitutes the power source of the mechanical timepiece, the front train wheel that rotates by the rotational force when the mainspring is unwound, and the escapement / governing device that controls the rotation of the front train wheel The escapement and speed governor are equipped with a balance that alternates between clockwise and counterclockwise rotation, an escape wheel that rotates based on the rotation of the front train wheel, and an escape wheel that rotates based on the operation of the balance. In a mechanical timepiece configured to include an ankle for controlling the balance, a static electricity is generated when the rotation angle of the balance with hairspring (140) exceeds a predetermined threshold, and the rotation angle of the balance with hairspring (140) is reduced. A mechanical timepiece having a balance rotation angle control mechanism (322, 324, 326) configured to prevent generation of static electricity when a predetermined threshold value is not exceeded.

2. The balance rotation angle control mechanism (322, 324, 326) is composed of a balance insulation plate (324) provided on the balance with hairspring (140) and a base plate insulation plate (322) arranged with respect to the base plate (102). The mechanical type according to claim 1, wherein a gap is provided between the balance insulating plate (324) and the ground plate insulating plate (322).

3. The balance rotation angle control mechanism (322, 324, 326)

A switch lever (168) rotatably mounted on the balance with hairspring (166), and a hairspring switch mounted rotatably on the switch lever (168) and arranged to operate in contact with the hairspring. (312) and the spring contact (33) to determine the position of the hairspring switch (312)

40, 342) and

By rotating the hairspring switch member (3 12), the balance insulating plate

(324) and the ground plane insulation plate (322). Is configured to

3. The mechanical timepiece according to claim 2, wherein:

4. The balance rotation angle control mechanism (322, 324, 326)

4. The method according to claim 3, wherein the ground plate insulating plate is provided for short-circuiting the insulating plate and includes a resistor connected between the ground plate insulating plate and the hairspring switch member. The mechanical watch as described.

8