JP2012189491A - Detent escapement for timepiece, and mechanical timepiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detent escapement for a timepiece and a mechanical timepiece that are capable of effectively utilizing a restoring force of a return spring, and easily and reliably securing a desired swing angle of a balance.SOLUTION: A detent escapement for a timepiece includes: an escape wheel 2; a balance 5 having a swing jewel 3 contactable with a tooth part 2a of the escape wheel 2, and an unlocking jewel 4, and swinging freely about a balance staff 9; an operating lever 23 having a locking jewel 6 contactable with the tooth part 2a of the escape wheel 2, and supported separably from the escape wheel 2; and a return spring for energizing the operating lever 23 to return to an original position. The restoring force of the return spring energized to the operating lever 23, which is displaced according to the free swinging of the balance 5, is transferred to the escape wheel 2 through the operating lever 23 and the locking jewel 6, to increase a rotational torque of the escape wheel 2, and further to transfer the rotational torque to the balance 5.

Description

  The present invention relates to a watch detent escapement and a mechanical watch using the same.

Conventionally, a detent escapement is known as an escapement for maintaining the rate of a mechanical watch. This detent escapement includes a escape wheel, a balance that freely vibrates around the balance, and an operating lever.
The balance with a balance wheel that can come into contact with the tooth portion of the escape wheel and a removal stone that can come into contact with the operating lever, and is free to vibrate through the hairspring. The actuating lever is supported via a return spring so as to be able to contact and separate from the escape wheel. The return spring biases the operating lever to return to the original position. Further, the operating lever is provided with a retaining stone that can come into contact with the tooth portion of the escape wheel.

Then, when the unlocking stone rotates in the direction to move the operating lever away from the escape wheel due to the free vibration of the balance with hairspring, the operating lever is separated from the escape wheel and the stop that was in contact with the tooth portion of the escape wheel The stone will come off and the escape wheel will rotate one tooth. Subsequently, while the escape wheel rotates by one tooth, the restoring force of the return spring acts on the operating lever, and the operating lever returns to the original position. Thereby, a stop stone contacts the tooth part of the escape wheel again, and the rotation of the escape wheel stops.
Here, when the escape wheel rotates by one tooth, the tooth portion of the escape wheel comes in contact with the balance wheel of the balance wheel, and the rotational energy of the escape wheel is transmitted to the balance via the rotation stone. Thus, the free vibration of the balance with hairspring is maintained (see, for example, Patent Document 1, Patent Document 2, Patent Document 3, and Non-Patent Document 1).

JP 2009-510425 A JP 2010-145396 A JP 2010-181223 A

George Daniel, "The Practical Watch Escapment", Premier Print Limited, 1994 (first edition), 39-47

By the way, in a general mechanical type timepiece, the balance of the balance with the balance obtained by obtaining a desired swing angle can contribute to the improvement of the timing accuracy. For this reason, there is a demand for ensuring that the starch can secure a desired swing angle. Therefore, in the detent escapement, it is required to improve the transmission efficiency of the energy transmitted from the power spring through the train wheel so that the balance with the input energy can be obtained with a smaller input energy. Along with this, by reducing the size and thickness of the mainspring with the same capacity barrel, it contributes to the improvement of the time duration of the watch.
However, in the above-described prior art, the restoring force of the return spring is used only to return the operating lever to the original position, and it is difficult to say that the elastic force of the return spring is effectively used. is there.

  Therefore, the present invention has been made in view of the above-described circumstances, and provides a detent escapement for a watch and a mechanical watch that can effectively use the restoring force of a return spring and improve energy transmission efficiency. To do.

  In order to solve the above problems, a detent escapement for a watch according to the present invention (for example, detent escapement 1) includes a escape wheel (eg escape wheel 2) and the escape wheel. A calculus (e.g., calculus 3) that can come into contact with the other teeth (e.g., tooth 2a), and a calculus (e.g., calculus 4). It has a free-vibrating balance (for example, a balance 5) and a stop stone (for example, a stop stone 6) that can come into contact with the tooth portion of the escape wheel, and is supported so as to be able to contact and separate from the escape wheel. An actuating lever (for example, the actuating lever 23), a return spring (for example, the return spring 22) that urges the actuating lever to return to its original position, and the displacement of the balance with free vibration of the balance. Restoring force transmission that transmits the restoring force of the return spring biased by the operating lever to the escape wheel And a stage to increase the rotational torque of the escape wheel by using the restoring force transmitted by the restoring force transmitting means, further the rotational torque, characterized in that to transmit to the balance.

  By comprising in this way, since the restoring force of a return spring can be transmitted to a balance with a escape wheel, the energy transmission efficiency of a timepiece detent escapement can be improved. That is, the restoring force of the return spring can be effectively used to increase the rotational energy of the balance.

  In the watch detent escapement according to the present invention, the restoring force transmitting means is also used by the operating lever and the retaining stone, and the restoring force is transmitted to the cancer via the operating lever and the retaining stone. It is transmitted to the gear.

  With this configuration, it is possible to easily transmit the restoring force of the return spring to the escape wheel using existing parts without providing a separate restoring force transmitting means.

  In the timepiece detent escapement according to the present invention, the restoring force transmitting means is a protrusion (for example, an assist stone 86, an assist stone) that is provided on the operating lever and can contact the tooth portion of the escape wheel. A pin 87), and when the protrusion comes into contact with a tooth portion of the escape wheel, the restoring force is transmitted to the escape wheel via the operating lever and the protrusion. It is characterized by.

  With this configuration, it is possible to easily transmit the restoring force of the return spring to the escape wheel with a simple structure.

The watch detent escapement according to the present invention includes a first corner portion (for example, a rocking corner 75) that contacts the stop stone at a tip of a tooth portion of the escape wheel, and the first corner portion. A stop surface (for example, stop surfaces 6a and 61a) that forms a second corner (for example, a leaving corner 76) disposed on the side opposite to the stop stone, and that the stop stone contacts the first corner. And a lower surface (for example, the lower surface 6b) disposed on the opposite side of the stop surface from the first corner, and a stop stone connected to the stop surface and the lower surface and disposed on the escape wheel side. A back surface (e.g., back surface 6d), and by pressing the back surface of the retaining stone against the second corner portion of the tooth portion of the escape wheel, the restoring force is transmitted to the escape wheel. It is characterized by that.
In this case, the tooth portion of the escape wheel includes a contact surface on the stop stone side (for example, a contact surface 71) and a back surface of the tooth portion disposed on the opposite side of the contact surface to the stop stone (for example, The stop stone is connected to the stop surface contacting the contact surface, the lower surface of the stop surface opposite to the contact surface, and the stop surface and the lower surface. , A stop stone back surface arranged on the escape wheel side, a third corner portion (for example, a rocking corner 6e) forming a cross ridge line portion between the stop surface and the stop stone back surface, the lower surface and the stop A fourth corner portion (for example, a leaving corner 6f) that forms an intersecting ridge line portion with the stone back surface, and the fourth corner portion of the stop stone is pressed against the back surface of the tooth portion of the escape wheel. Thus, the restoring force may be transmitted to the escape wheel.

  By comprising in this way, the restoring force of a return spring can be efficiently transmitted to a escape wheel via an operation lever and a stop stone.

In the detent escapement for a watch according to the present invention, the tooth portion of the escape wheel includes a contact surface on the stop stone side, and a back surface of the tooth portion disposed on the opposite side of the contact surface to the stop stone. The stop stone is connected to the stop surface contacting the contact surface, the lower surface of the stop surface opposite to the contact surface, the stop surface and the lower surface, and the cancer A stop stone back surface disposed on the side of the wheel, and centering on the shaft portion (for example, the shaft portion 19) of the escape wheel, the shaft portion, the stop stone, and the escape wheel The back surface of the stop stone is fixed to the tangent line (for example, tangent line SL1) at the contact portion in a virtual circle (for example, virtual circle KC1) having a radius between the contact portion and the contact portion as a radius. It is formed so as to be inclined toward the vehicle side, and an angle between the back surface of the retaining stone and the tangent is θ1, The surface, when the angle θ2 between the back of the teeth of the escapement wheel, the angle .theta.1, and the angle θ2 is,
θ1 ≧ 0 °
θ2 ≧ 0 °
It is set so that it may satisfy | fill.

  With this configuration, the restoring force of the return spring can be reliably transmitted to the balance via the escape wheel without disturbing the rotation of the escape wheel, and the watch detent escapes. The energy transfer efficiency of the machine can be improved.

In the detent escapement for a watch according to the present invention, the tooth portion of the escape wheel includes a contact surface on the stop stone side, and a back surface of the tooth portion disposed on the opposite side of the contact surface to the stop stone. The stop stone is connected to the stop surface contacting the contact surface, the lower surface of the stop surface opposite to the contact surface, the stop surface and the lower surface, and the cancer A back surface disposed on the side of the wheel, and forming a curved surface portion (for example, a curved surface 61c) on the back surface of the stop stone, and pressing the curved surface portion against the back surface of the tooth portion, The detent escapement for a watch according to claim 2, wherein the escapement is transmitted to a escape wheel, wherein the axle portion, the retaining stone, and the escape wheel are centered on an axle portion of the escape wheel. In a virtual circle (for example, virtual circle KC2) having a radius (for example, radius R2) as a distance between the contact portion and the contact portion with which the tooth portion contacts Tangent at the contact portion (e.g., tangent SL2) and the angle θ3 between the tangent (e.g., tangential SL3) in the contact portion of the curved portion of the locking stone,
θ3 ≧ 0 °
It is set so that it may satisfy | fill.

  By configuring in this way, even if the contact angle between the tooth portion of the escape wheel and the stop stone changes due to rotation of the escape wheel, the tooth portion of the escape wheel and While the stone is in contact with the stone, the direction of the force applied to the tooth of the escape wheel by the stone is fixed, or the tooth thickness of the escape wheel is set to be thick. The transmission efficiency can be further improved by increasing the strength of the teeth and reducing the completion moment of the escape wheel.

The watch detent escapement according to the present invention is characterized in that a round chamfered portion (for example, a round chamfered portion 78) is formed in each of the first corner portion and the second corner portion.
In addition, a round chamfer is formed at each of the third corner and the fourth corner.

  By comprising in this way, the tooth part of a escape wheel and a stop stone can be made to contact smoothly, and it becomes possible to reduce the contact resistance which arises between a tooth part and a stop stone.

  A mechanical timepiece according to the invention is a timepiece detent escapement according to any one of claims 1 to 9, a mainspring (for example, mainspring 111) constituting a power source, and the mainspring is rewound. And a front train wheel (for example, the front train wheel 105) that is rotated by the rotational force of the time, and the rotation of the front train wheel is controlled by the timepiece detent escapement.

  By comprising in this way, the mechanical timepiece which mounts the detent escapement for timepieces excellent in energy transmission efficiency can be provided.

According to the present invention, since the restoring force of the return spring can be transmitted to the balance via the escape wheel, the energy transmission efficiency of the watch detent escapement can be improved.
In addition, it is possible to easily transmit the restoring force of the return spring to the escape wheel by using existing parts without separately providing restoring force transmitting means.

It is the top view which looked at the movement of the mechanical timepiece in 1st embodiment of this invention from the back cover side. It is a perspective view of a detent escapement in a first embodiment of the present invention. It is a top view of the detent escapement in the first embodiment of the present invention. It is the A section enlarged view of FIG. It is operation | movement explanatory drawing of the detent escapement in 1st embodiment of this invention. It is operation | movement explanatory drawing of the detent escapement in 1st embodiment of this invention. It is operation | movement explanatory drawing of the detent escapement in 1st embodiment of this invention. It is operation | movement explanatory drawing of the detent escapement in 1st embodiment of this invention. It is a state explanatory view of FIG. It is the B section enlarged view of FIG. It is operation | movement explanatory drawing of the detent escapement in 1st embodiment of this invention. It is operation | movement explanatory drawing of the detent escapement in 1st embodiment of this invention. It is operation | movement explanatory drawing of the detent escapement in 1st embodiment of this invention. It is operation | movement explanatory drawing of the detent escapement in 1st embodiment of this invention. It is a graph which shows the change of the balance angular velocity in 1st embodiment of this invention. It is a graph which shows the change of the rotational torque which the balance in 1st embodiment of this invention received from the escape wheel. It is the graph which compared the change of the balance angle of the balance in 1st embodiment of this invention, and the change of the balance of the balance of the balance in the past. It is a principal part enlarged view of the detent escapement in 2nd embodiment of this invention. It is a principal part enlarged view of the detent escapement in 3rd embodiment of this invention. It is a principal part enlarged view of the detent escapement in 4th embodiment of this invention. It is a top view of the detent escapement in 5th embodiment of this invention, Comprising: (a) shows the state which the escape wheel has stopped, (b) shows the restoring force of a return spring to an operating lever. The state which is transmitting to the escape wheel via is shown. It is a top view of the detent escapement in 6th embodiment of this invention, Comprising: (a) shows the state which the escape wheel has stopped, (b) is an operating lever with the restoring force of a return spring. The state which is transmitting to the escape wheel via is shown. It is a schematic block diagram of the tooth part of the escape wheel & pinion in other examples of the present invention.

(First embodiment)
(Mechanical watch)
Next, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a plan view of a movement of a mechanical timepiece as viewed from the back cover side.
As shown in FIG. 1, the mechanical timepiece 100 includes a movement 101. The movement 101 has a base plate 102 that constitutes the substrate of the movement 101. A winding stem guide hole 103 is formed in the base plate 102, and a winding stem 104 is rotatably incorporated therein.

Further, on the back side of the movement 101 (the back side in the drawing in FIG. 1), a switching device (not shown) including a setting lever, a yoke and a yoke presser is arranged. The position of the winding stem 104 in the axial direction is determined by this switching device.
On the other hand, on the front side of the movement 101 (the front side in FIG. 1), a fourth wheel 106, a third wheel 107, a second wheel 108, and a barrel complete 110 that constitute the front wheel train 105 are arranged. A detent escapement 1 that controls the rotation of the front wheel train 105 is disposed.

The barrel wheel 110 has a mainspring 111, and when the winding stem 104 is rotated, a not-illustrated pinion wheel is rotated, and further, via a chi-wheel, a round hole wheel, and a square hole wheel (all not shown). The mainspring 111 is wound up. The barrel wheel 110 is rotated by the rotational force when the mainspring 111 is rewound, and the center wheel & pinion 108 is further rotated.
The second wheel & pinion 108 has a second pinion that meshes with a barrel wheel (not shown) of the barrel complete 110 and a second gear (both not shown). When the second wheel & pinion 108 rotates, the third wheel & pinion 107 is configured to rotate.

The third wheel & pinion 107 has a third pinion (not shown) that meshes with the second gear of the second wheel 108 and a third gear (both not shown). When the third wheel & pinion 107 rotates, the fourth wheel & pinion 106 is configured to rotate.
The fourth wheel & pinion 106 has a fourth pinion (not shown) that meshes with the third gear of the third wheel 107 and a fourth gear (both not shown). The detent escapement 1 is driven by the rotation of the fourth wheel & pinion 106. When the detent escapement 1 is driven, the fourth wheel & pinion 106 is controlled to rotate once per minute, and the second wheel & pinion 108 is controlled to rotate once per hour.

(Detent escapement)
FIG. 2 is a perspective view of the detent escapement, and FIG. 3 is a plan view of the detent escapement.
As shown in FIGS. 2 and 3, the detent escapement 1 includes a escape wheel 2 that rotates when the fourth wheel & pinion 106 rotates, and a retaining stone that can contact the tooth portion 2 a of the escape wheel 2. 6, a pallet 3 that can come into contact with the teeth 2 a of the escape wheel 2, and a balance 5 that has a removal stone 4 that can come into contact with the detent 7.

The escape wheel 2 has an escape wheel 8 that meshes with a fourth gear (not shown), and is rotated by a main plate 102 (see FIG. 1) and a train wheel bridge (not shown) via a shaft portion 19. It is pivotally supported. Further, a plurality (for example, fifteen in this embodiment) of tooth portions 2 a of the escape wheel 2 are formed on the outer peripheral portion of the escape wheel 2.
The escape wheel 2 configured in this manner is given a rotational force in the clockwise direction (see arrow CW1) in FIG.

The balance with hairspring 5 freely oscillates around the balance stem 9, which is the rotation axis. In addition to the balance stem 9, the balance wheel 10 disposed concentrically with the balance stem 9, and a substantially disc-like shape A large brim 11 and a hairspring 51 are provided. Then, the upper shaft portion of the balance stem 9 (not shown) is rotatably supported, and the lower shaft portion of the balance 9 is rotatably supported by the base plate 102, whereby the main plate 102 and the balance rest are supported. The balance 5 is pivotally supported.
The hairspring 51 is a thin plate spring formed in a spiral shape, and the balance 5 is freely oscillated when the hairspring 51 is wound or unwound.

Further, the big brim 11 is provided with a rock stone 3 and a removal stone 4. The pallet stone 3 is formed in a rectangular parallelepiped shape so that the cross-sectional shape becomes longer along the radial direction of the large brim 11, and the tooth portion of the escape wheel 2 out of the two faces facing in the cross-sectional short direction. The contact surface 3a which contacts 2a is formed so as to protrude from the large brim 11 as compared with the other surfaces.
The removal stone 4 can come into contact with a later-described one-side actuating spring 24 provided in the detent 7. The detent 7 is activated by the removal stone 4.

  The detent 7 is fixed to the main plate 102 via a fixed washer 12. The fixed washer 12 includes a large-diameter washer 12a and a small-diameter washer 12b, and the detent 7 is formed by the washers 12a and 12b in a state where the large-diameter washer 12a is disposed on the base plate 102 side (lower side in FIG. 2). Is pinched. In this state, the detent 7 is fixed via the pair of fixing pins 13a and 13b.

  Further, the fixed washer 12 is connected to the rotating lever 14 provided on the opposite side with the ground plate 102 interposed therebetween via an adjustment bolt 15. The adjustment bolt 15 is provided so as to penetrate the center of the fixed washer 12 in the radial direction. The rotation lever 14 is for adjusting the attachment angle of the detent 7 and can be removed after adjusting the attachment angle of the detent 7.

(Detent)
The detent 7 includes a disc-shaped detent fixing portion 21 sandwiched between a large-diameter washer 12a and a small-diameter washer 12b of the fixed washer 12, and an operating lever 23 supported by the detent fixing portion 21 via a return spring 22. And the one-side actuating spring 24 that can come into contact with the removal stone 4 are integrally formed.
Here, as a method for performing the integral molding, for example, a detent 7 is formed by electroforming, or an LIGA (Lithographie) that adopts an optical technique such as photolithography.
It is possible to form the detent 7 by a Galvanoform Abform) process, DRIE, or MIM.

  The diameter of the detent fixing portion 21 is set to be substantially the same as the diameter of the small diameter washer 12 b that constitutes the fixed washer 12. A bolt insertion hole (not shown) through which the adjustment bolt 15 can be inserted is formed in the center of the detent fixing portion 21 in the radial direction, and a pair of fixing pins 13a and 13b can be inserted on both sides of the bolt insertion hole. Two pin insertion holes 26a and 26b are formed. Of the two pin insertion holes 26a, 26b, one pin insertion hole 26b is formed in an oval shape so as to absorb manufacturing errors of each component.

  In addition, a concave portion 27 is formed on the balance 5 side (upper side in FIG. 3) on the outer peripheral portion of the detent fixing portion 21, and a return spring 22 is erected here. The return spring 22 is formed in a plate shape along a straight line L that connects the base end 22a and the center (axial center) of the balance 9 of the balance 5. The return spring 22 is preferably formed of an elastic material such as nickel.

  The actuating lever 23 provided at the distal end of the return spring 22 is a rectangular parallelepiped arm portion 28 along the straight line L, and is disposed on the distal end side of the arm portion 28 and has a wider stone fixing portion than the arm portion 28. 29 and a cuboid-shaped distal end portion 30 which is disposed on the distal end side than the retaining stone attaching portion 29 and is thinner than the arm portion 28 are integrally formed. The stop stone attaching portion 29 is provided with a stop stone 6 that can come into contact with the tooth portion 2 a of the escape wheel 2.

FIG. 4 is an enlarged view of a portion A in FIG.
As shown in detail in FIG. 4, the retaining stone 6 is formed in a substantially trapezoidal shape such as an artificial ruby so that the cross-sectional shape gradually becomes wider toward the distal end portion 30 of the operating lever 23. It has been done.

  More specifically, the stop stone 6 is a stop surface 6a that is substantially orthogonal to the straight line L and located on the tip side (upper side in FIG. 4) in a state where the arm portion 28 of the operating lever 23 is along the straight line L. And the lower surface 6b facing the stop surface 6a, the stop surface 6a and the lower surface 6b on the opposite side of the escape wheel 2 (right side in FIG. 4), and substantially on the stop surface 6a and the lower surface 6b. It has a side surface 6c that is orthogonal, and a back surface 6d that is positioned on the escape wheel 2 side (left side in FIG. 4) of the stop surface 6a and the lower surface 6b and is inclined with respect to the straight line L. And the intersection ridgeline part of the stop surface 6a and the back surface 6d is made into the rocking corner 6e, and the intersection ridgeline part of the lower surface 6b and the back surface 6d is made into the reeve corner 6f.

Here, the tooth portion 2a of the escape wheel 2 is positioned in front of the rotation direction of the escape wheel 2 (the direction of the arrow CW1 in FIGS. 3 and 4), and a contact surface 71 that contacts the retaining stone 6; The contact surface 71 is opposed to the back surface 73 positioned rearward in the rotational direction, and the tooth tip surface 74 is located radially outside and connects the contact surface 71 and the back surface 73. The intersecting ridge line portion between the contact surface 71 and the tooth tip surface 74 is a rocking corner 75, and the intersecting ridge line portion between the back surface 73 and the tooth tip surface 74 is a leaving corner 76.
Further, the contact surface 71 is configured by an inclined surface 71 a that is inclined with respect to the radial straight line KL of the escape wheel 2. The inclined surface 71a is inclined toward the shaft portion 19 side of the escape wheel 2 with respect to the radial straight line KL.

  1 to 3, one end of the one-side actuating spring 24 is integrally formed on the base end side of the arm portion 28 of the actuating lever 23. On the other hand, the distal end portion 30 of the operating lever 23 is arranged so that the center thereof is slightly offset from the straight line L toward the side opposite to the escape wheel 2 (right side in FIG. 3). The tip of the one-side actuating spring 24 is in contact with the contact surface 30a on the escape wheel 2 side of the tip 30 thus offset.

The one-side actuating spring 24 is formed in a substantially six shape in plan view, and includes an arc portion 31 extending from the base end portion of the arm portion 28 and a tip portion 30 of the actuating lever 23 from the tip end of the arc portion 31. It is comprised by the linear part 32 extended toward. The arc portion 31 and the linear portion 32 are elastically deformed along the contact / separation direction with respect to the operating lever 23.
The arc portion 31 extends from the base end portion of the arm portion 28 toward the side opposite to the escape wheel 2 (the right side in FIGS. 3 and 4) and along a direction substantially orthogonal to the straight line L. After that, it is formed in an arc shape so as to surround about 3/4 of the periphery of the detent fixing portion 21.

  On the other hand, the straight portion 32 extends from the tip of the arc portion 31 so as to be gently inclined with respect to the straight line L, and the straight portion 32 is straighter than the gentle slope portion 32a from the tip of the gentle slope portion 32a. A steeply inclined portion 32b extending so as to incline with respect to L and having a tip abutting against the tip portion 30, and a tongue piece portion 32c extending along the tip portion 30 from the steeply inclined portion 32b. It is configured.

The gently inclined portion 32 a extends from the tip of the arc portion 31 to a position corresponding to the stop stone attaching portion 29. That is, the linear portion 32 is formed to extend from the tip of the arc portion 31 toward the tip portion 30 of the operating lever 23 so as to avoid interference with the stop stone mounting portion 29 of the operating lever 23.
Further, the tongue piece portion 32 c is formed to extend so that the tip thereof slightly protrudes from the tip portion 30 of the operating lever 23. The removal stone 4 of the balance 5 comes into contact with the portion protruding from the tip 30 of the tongue piece 32c.

The actuating lever 23 of the detent 7 configured as described above can be brought into and out of contact with the escape wheel 2 with the base end 22a of the return spring 22 as a fulcrum 23a. In other words, the return lever 22 is elastically deformed so as to be centered on the base end 22 a, whereby the operating lever 23 is displaced in the contact and separation direction with respect to the escape wheel 2.
Note that the one-side actuating spring 24 is desirably formed of an elastic material such as nickel, for example, like the return spring 22.

  The return spring 22 biases the operating lever 23 to return to the original position. That is, as shown in FIG. 3, the return spring 22 is biased so as to return to a position where the longitudinal direction of the arm portion 28 of the operating lever 23 is on the straight line L. On the other hand, the one-side actuating spring 24 is set to have such a spring force that the tongue piece portion 32 c of the one-side actuating spring 24 can always come into contact with the tip end portion 30 of the actuating lever 23.

  The removal stone 4 that can come into contact with the tongue piece portion 32c of the one-side actuating spring 24 is formed such that the contact surface 4a that comes into contact with the surface of the tongue piece portion 32c opposite to the tip portion 30 is along the tongue piece portion 32c. Yes. On the other hand, an inclined surface 4b is formed on the side opposite to the contact surface 4a of the removal stone 4 by flattening. Thereby, the detachment stone 4 is tapered as it goes to the radially outer side of the large brim 11 such that the cross-sectional shape is trapezoidal. The removal stone 4 is positioned so that the locus of the tip during free vibration of the balance 5 is in a position where it cannot contact the operating lever 23 and can be contacted with the tongue piece 32c of the one-side operating spring 24. Be placed.

By configuring the removal stone 4 and the detent 7 in this way, the operating lever 23 can be moved away from the escape wheel 2 or brought close to it with free vibration of the balance 5 (details will be described later). .
Here, the base plate 102 is provided with a stopper 40 that regulates the displacement of the operating lever 23 in the direction approaching the escape wheel 2. The stopper 40 has a stopper arm 41 and a stopper pin 42 erected on the tip of the stopper arm 41. The proximal end side of the stopper arm 41 is fixed to the main plate 102 via a fixing pin 43.

The stopper pin 42 comes into contact with the arm portion 28 of the operating lever 23 from the escape wheel 2 side. Thereby, the displacement toward the direction which approaches the escape wheel 2 of the operating lever 23 is controlled.
In addition, the stopper arm 41 is provided so as to be rotatable about the fixed pin 43 so that the position of the stopper pin 42 can be adjusted. By adjusting the position of the stopper pin 42, the movement restriction position of the operating lever 23 is such that the stop stone 6 can contact the tooth portion 2a of the escape wheel 2 and the longitudinal direction of the arm portion 28 is on the straight line L. Is set to a position.

(Operation of detent escapement)
Next, based on FIGS. 5-14, operation | movement of the detent escapement 1 is demonstrated.
5 to 8 and FIGS. 11 to 14 are operation explanatory views of the detent escapement.
As shown in FIG. 5, when the operating lever 23 of the detent 7 is located at a position along the straight line L, the stop 2 of the escape wheel 2 and the stop stone 6 provided on the operating lever 23 are stopped. The surface 6a is in contact with each other, the two and 6 are engaged, and the escape wheel is stopped.

Then, the balance 5 freely vibrates, so that the large brim 11 rotates in the direction of the arrow CCW1 (counterclockwise direction in FIG. 5), and the contact surface 4a of the release stone 4 provided on the large brim 11 When the tip of the tongue piece portion 32c of the one-side actuating spring 24 comes into contact, the operation of the actuating lever 23 is started (actuating lever operation start state).
Here, as shown in FIG. 4, the contact surface 71 of the tooth portion 2 a of the escape wheel 2 is inclined toward the escape wheel 2 side with respect to the radial straight line KL of the escape wheel 2. It is comprised by the inclined surface 71a. For this reason, the rocking corner 75 of the tooth portion 2a is in contact with the stop surface 6a of the retaining stone 6.

As shown in FIG. 6, when the balance 5 further freely vibrates from the operation lever operation start state, the operation lever 23 is pressed by the release stone 4 via the tongue piece portion 32 c. And it displaces toward the direction away from the escape wheel 2 (refer arrow Y1 in FIG. 6).
When the operating lever 23 is displaced in a direction away from the escape wheel 2, the retaining stone 6 provided on the operating lever 23 is detached from the tooth portion 2 a of the escape wheel 2, The combination is released (the escape wheel stop is released).
As a result, the escape wheel 2 rotates in the direction of the arrow CW1 (clockwise direction in FIG. 6).

  Subsequently, as shown in FIG. 7, the escape wheel 2 almost simultaneously starts when the escape wheel 2 starts to rotate in the direction of the arrow CW1 by the rotation of the large brim 11 in the direction of the arrow CCW1. The contact surface 3a of the granite 3 comes into contact with the tooth portion 2a. Then, the rotational torque of the escape wheel 2 is transmitted to the balance 5 via the flutes 3. At this time, the balance with the balance 5 is applied with the rotational torque in the direction of the arrow CCW1 (the balance with the rotation of the balance with the balance).

  As shown in FIG. 8, while the rotational torque of the escape wheel 2 is transmitted to the balance 5 via the rock stone 3, the operating lever 23 is moved by the restoring force of the return spring 22 that supports the operating lever 23. In order to return to the position, it is displaced toward the direction approaching the escape wheel 2 (see arrow Y2 in FIG. 8). Then, the back surface 6d of the stop stone 6 provided on the operating lever 23 comes into contact with the back surface 73 side of the tooth portion 2a of the escape wheel 2 (tooth portion back surface, stop stone back surface contact state).

This contact state will be described in detail with reference to FIGS.
FIG. 9 is an explanatory diagram of the state of FIG. 8, and FIG. 10 is an enlarged view of part B of FIG.
As shown in FIGS. 9 and 10, the actuating lever 23 is displaced toward the direction away from the escape wheel 2 by the removal stone 4, and then the actuating lever 23 is actuated by the restoring force of the return spring 22. When displaced toward the direction approaching the vehicle 2, the back surface 6 d of the retaining stone 6 comes into contact with the reeve corner 76 of the tooth portion 2 a of the escape wheel 2.

Here, the inclination angles of the escape wheel 2 and the back surfaces 73 and 6d of the retaining stone 6 that are in contact with each other are set based on predetermined conditions. More specific description will be given below.
In setting the condition of the inclination angle, first, the reed of the tooth portion 2a, which is a contact portion where the tooth portion 2a of the escape wheel 2 and the stop stone 6 are in contact with each other, with the shaft portion 19 of the escape wheel 2 being the center. A virtual circle KC1 having a radius R1 as a distance between the corner 76 and the shaft portion 19 of the escape wheel 2 is formed. In this imaginary circle KC1, the angle between the tangent line SL1 corresponding to the leaving corner 76 of the tooth portion 2a and the back surface 6d of the stop stone 6 is θ1, and the back surface 6d of the stop stone 6 and the back surface of the tooth portion 2a When the angle between the angle 73 and θ2 is θ2,
These angles θ1, θ2 are
θ1 ≧ 0 ° (1)
θ2 ≧ 0 ° (2)
It is set to satisfy.

  By setting the inclination angle of the back surface 6d of the retaining stone 6 and the inclination angle of the back surface 73 of the tooth part 2a so that the angles θ1 and θ2 satisfy the expressions (1) and (2), respectively. When the back surface 6d of the retaining stone 6 comes into contact with the reeving corner 76, the component force F2 of the pressing force F1 that the retaining stone 6 presses the tooth portion 2a by the restoring force of the return spring 22 is the rotational direction of the escape wheel 2 ( Acts in the direction of arrow CW1). Thereby, the rotational torque of the escape wheel 2 is increased. The increased rotational force of the escape wheel & pinion 2 is further transmitted to the balance with hairspring 5 through the flutes 3.

More precisely, since the angle θ1 is defined by the friction coefficient μ at the contact portion between the leaving corner 76 of the tooth portion 2a and the back surface 6d of the stop stone 6,
tan θ1> μ (3)
Is preferably set.

As shown in FIG. 11, the escape wheel 2 continues to rotate in the direction of arrow CW1 (clockwise direction in FIG. 11), so that the tooth portion 2a is separated from the stop stone 6 (the back of the tooth portion, the stop stone). Back contact end state).
After this, as shown in FIG. 12, the collar 11 of the balance 5 to which rotational torque is applied from the escape wheel 2 rotates in the direction of the arrow CCW1 (counterclockwise direction in FIG. 12), and the tooth portion The swing stone 3 is separated from 2a (the balance with the balance with the balance with the balance with hairspring).

  Subsequently, as shown in FIG. 13, the locking corner 75 of the tooth portion 2 a comes into contact again with the stop surface 6 a of the retaining stone 6 of the operating lever 23 returned to the original position. Then, the escape wheel 2 and the retaining stone 6 are engaged, and the rotation of the escape wheel 2 is stopped. Here, the escape wheel 2 rotates by one tooth after the engagement between the escape wheel 2 and the stop stone 6 is released and then again (engaged with the escape wheel). .

Then, as shown in FIG. 14, the balance with the balance spring 51 provided on the balance 5 is wound up in the balance 5 to which the rotational force in the direction of the arrow CCW <b> 1 is applied by the escape wheel 2. Further, when the hairspring 51 is wound up by a predetermined amount of energy applied by the escape wheel 2, the restoring force of the hairspring 51 and the rotational force of the balance 5 are reversed, and the rotation direction of the large brim 11 is indicated by an arrow. It turns in the CW2 direction (clockwise direction in FIG. 14).
When the large brim 11 rotates in the direction of the arrow CW2, the inclined surface 4b of the removal stone 4 comes into contact with the tip of the tongue piece portion 32c of the one-side actuating spring 24. Further, when the large brim 11 further rotates, the tongue piece 32c of the one-side actuating spring 24 is pressed toward the direction away from the actuating lever 23, that is, the direction toward the escape wheel 2 (see arrow Y3). The Then, the one-side actuating spring 24 is elastically deformed so as to expand the linear portion 32.

  Further, when the large brim 11 rotates in the direction of the arrow CW2 and reaches a predetermined angle, the stone 4 is removed from the tongue piece 32c of the one-side actuating spring 24. Then, due to the restoring force of the one-side actuating spring 24, the tongue piece 32c is displaced toward the actuating lever 23 side (see arrow Y4 in FIG. 14) and returns to the original position.

  On the other hand, the hairspring 51 provided on the balance 5 is rewound while the large brim 11 is rotating in the direction of the arrow CW2. When the hairspring 51 is rewound by a predetermined amount, the restoring force of the hairspring 51 and the rotational force of the balance 5 are reversed, and the rotation direction of the large collar 11 is again in the direction of the arrow CCW1 (counterclockwise direction in FIG. 14). Turn to.

By repeating this, the balance 5 freely vibrates around the balance 9 and the detent 7 repeats the state shown in FIGS. For this reason, the escape wheel 2 is always released from being stopped and rotated at regular intervals.
Under such an operation, the restoring force of the return spring 22 that supports the operating lever 23 can be transmitted to the balance 5 via the operating lever 23, the retaining stone 6, the escape wheel 2, and the gangue 3. Therefore, the energy transmission efficiency of the detent escapement 1 can be improved.

More specifically, description will be made based on FIGS.
FIG. 15 is a graph showing changes in the balance angular velocity when the ordinate is the balance angular velocity (rad / s) and the abscissa is the elapsed time (ms), and FIG. 16 is the rotational torque received by the balance 5 on the ordinate. It is a graph which shows the change of the rotational torque which the balance 5 received from the escape wheel 2 when it is set as (N * mm) and a horizontal axis is made into elapsed time (ms).
As shown in FIGS. 15 and 16, the balance 5 that is freely oscillating receives resistance from the operation lever 23 in the operation lever operation start state (see FIG. 5), and the balance speed of the balance is slightly decreased. Furthermore, since the operating lever 23 is displaced toward the direction away from the escape wheel 2 by the balance 5 thereafter, the angular velocity of the balance 5 is further reduced.

After this, the load applied to the balance with hairspring 5 is slightly reduced through the escape wheel stop release state (see FIG. 6), and then the rotational torque of the escape wheel 2 is changed from the balance rotation torque application start state (see FIG. 7). The balance is transmitted to the balance 5 and the angular speed of the balance 5 is increased.
Subsequently, the restoring force of the return spring 22 that further supports the operating lever 23 by the contact state of the back surface of the tooth portion and the back surface of the stop stone (see FIG. 8) 3 is transmitted to the balance 5 as rotational torque. For this reason, the angular velocity of the balance 5 is increased again.

  Here, as in the prior art, the angular speed of the balance with the balance 5 when not in contact with the back of the tooth portion and the back of the stone (see FIG. 8) is that the restoring force of the return spring 22 is transmitted to the balance 5 as the rotational torque. There is no. For this reason, the angular speed of the balance with hairspring 5 is not increased in part C in FIG. 15 (see the two-dot chain line in FIG. 15). Therefore, in this first embodiment, the balance angle of the balance 5 is increased by the amount that the restoring force of the return spring 22 is transmitted to the balance 5 as rotational torque.

FIG. 17 shows the change in the swing angle of the balance with the balance of the first embodiment when the vertical axis is the swing angle (deg) of the balance 5 and the horizontal axis is the elapsed time (ms). It is the graph which compared with the change.
As shown in the figure, it can be confirmed that the swing angle of the balance with hairspring 5 of the first embodiment is larger than the conventional one.

  Therefore, according to the first embodiment described above, the restoring force of the return spring 22 that supports the operating lever 23 can be effectively used to increase the rotational energy of the balance 5. For this reason, it is possible to provide the mechanical timepiece 100 with improved energy transmission efficiency of the detent escapement 1 and improved duration.

  Further, when the operating lever 23 is displaced to the original position, the restoring force of the return spring 22 is transmitted to the escape wheel 2 by pressing the retaining stone 6 against the tooth portion 2 a of the escape wheel 2. is doing. That is, the restoring force of the return spring 22 is transmitted to the escape wheel 2 via the operating lever 23 and the retaining stone 6. For this reason, it is not necessary to separately provide a device (restoring force transmitting means) for transmitting the restoring force of the return spring 22 to the escape wheel 2, and the restoring force of the return spring 22 can be increased by using existing parts. It can be transmitted to the wheel 2. Therefore, the detent escapement 1 that is small in size, excellent in energy transmission efficiency, and low in cost can be provided.

  Further, when the back surface 73 of the tooth portion 2a of the escape wheel 2 and the back surface 6d of the stop stone 6 come into contact with each other, the back surface 6d of the stop stone 6 comes into contact with the leaving corner 76 of the tooth portion 2a. For this reason, the tooth part 2a and the stop stone 6 are in line contact. Therefore, it is possible to efficiently transmit force from the stop stone 6 to the tooth portion 2a, and to minimize the contact resistance between the tooth portion 2a and the stop stone 6.

  Then, as shown in FIG. 9, the angle between the tangent SL1 at the position corresponding to the leaving corner 76 of the tooth portion 2a and the back surface 6d of the stop stone 6 in the virtual circle KC1 is θ1, and the stop stone 6 When the angle between the back surface 6d and the back surface 73 of the tooth portion 2a is θ2, these angles θ1 and θ2 are set so as to satisfy the expressions (1) and (2), respectively. By setting in this way, it becomes possible to reliably transmit the restoring force of the return spring 22 to the balance 5 via the escape wheel 2 without hindering the rotation of the escape wheel 2. It is possible to provide the detent escapement 1 and the mechanical timepiece 100 which are excellent in energy transmission efficiency and excellent in operation stability.

  In the first embodiment described above, the chamfering process is applied to the rocking corner 6e and the leaving corner 6f of the retaining stone 6 and the rocking corner 75 and the leaving corner 76 of the tooth portion 2a of the escape wheel 2. Explained the case without. However, the present invention is not limited to this. Desirably, a round chamfered portion 78 (indicated by a two-dot chain line in FIG. 4) may be formed in each of the corners 6e, 6f, 75, and 76. By comprising in this way, the tooth part 2a and the stop stone 6 can be made to contact smoothly, and it becomes possible to further reduce the contact resistance of the tooth part 2a and the stop stone 6. FIG.

  In the first embodiment described above, when the back surface 73 of the tooth portion 2a of the escape wheel 2 and the back surface 6d of the stop stone 6 come into contact with each other, the back surface 6d of the stop stone 6 is brought into contact with the reeve corner 76 of the tooth portion 2a. The case of contact was explained. However, the portion where the tooth portion 2a and the retaining stone 6 are in contact with each other is not limited to the leaving rib 76 and the back surface 6d, and the restoring force of the return spring 22 is transmitted to the tooth portion 2a via the retaining stone 6. Thus, the tooth part 2a and the stop stone 6 should just contact.

For example, as for the pattern of the portion where the tooth portion 2a and the stop stone 6 are in contact with each other, the following pattern is given in addition to the first embodiment.
(1) The back surface 73 of the tooth portion 2a and the back surface 6d of the stop stone 6 are in contact with each other (2) The back surface 73 of the tooth portion 2a and the reeving corner 6f of the stop stone 6 are in contact with each other (3) Contact with the rocking corner 6e of the stone 6 (4) Contact between the rocking corner 75 of the tooth portion 2a and the back surface 6d of the stop stone 6 The tooth portion 2a and the stop stone 6 are in the patterns shown in (1) to (4). Even if it is a case where it contacts, the effect similar to the above-mentioned 1st embodiment can be show | played.

  Furthermore, in the first embodiment described above, the case where the operating lever 23 is supported on the detent fixing portion 21 via the return spring 22 has been described. However, the present invention is not limited to this, and like the so-called pivot detent escapement, the operating lever 23 is rotatably supported via a rotating shaft (not shown), and thereby the operating lever is connected to the escape wheel 2. You may comprise 23 so that contact / separation is possible. In this case, instead of the return spring 22, a spiral spring (not shown) or a leaf spring (for example, the return spring of Patent Document 3) is provided so as to surround a rotation shaft (not shown). And, by urging the operating lever 23 to return to the original position by these springs, the same effect as in the first embodiment described above can be obtained.

(Second embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same aspect as 1st embodiment, and description is abbreviate | omitted (same also about the following embodiment).
FIG. 18 is an enlarged view of a main part of the detent escapement according to the second embodiment, and shows a contact state on the back surface of the tooth portion and the back surface of the retaining stone (a state corresponding to FIG. 9 of the first embodiment described above). .

  In this second embodiment, the mechanical timepiece 100 is provided with a movement 101, the detent escapement 1 for controlling the rotation of the front train wheel 105 is disposed on the front side of the movement 101, and the detent removal. The advance machine 1 includes a escape wheel 2 that rotates when the fourth wheel & pinion 106 rotates, a detent 7 that includes an operating lever 23 that is supported so as to be movable toward and away from the escape wheel 2, and a cancer. The basic configuration such as the pallet stone 3 that can come into contact with the wheel 2 and the balance with the balance stone 4 that can come into contact with the detent 7 is the same as that of the first embodiment described above (hereinafter referred to as the first embodiment). The same applies to the above embodiment).

Here, as shown in FIG. 18, the difference between the first embodiment described above and the second embodiment is that the shape of the retaining stone 6 of the first embodiment provided on the operating lever 23 and the second embodiment are as follows. There exists in the point from which the shape of the stop stone 61 of 2 embodiment differs.
That is, the stop stone 61 of the second embodiment is a stop surface that is substantially orthogonal to the straight line L and located on the tip side (upper side in FIG. 18) in a state where the arm portion 28 of the operating lever 23 is along the straight line L. 61a, the side of the stop surface 61a opposite to the escape wheel 2 (the right side in FIG. 18) and the side surface 61b along the straight line L, and the back side so as to straddle the stop surface 61a and the side surface 61b ( A curved surface 61c that is curved is formed on the left side in FIG.

  Under such a configuration, in the contact state of the back surface of the tooth portion and the back surface of the stop stone, the curved surface 61c of the stop stone 6 is in contact with the back surface 73 of the tooth portion 2a. That is, a part of the back surface 73 of the tooth part 2a and a part of the curved surface 61c of the retaining stone 6 are in line contact. Hereinafter, this line contact portion will be referred to as a contact portion 62 and described.

Here, the curved shape of the curved surface 61c of the retaining stone 6 is determined based on the following conditions.
First, in setting this condition, an imaginary circle KC2 is formed with the shaft portion 19 of the escape wheel 2 being the center and the distance between the shaft portion 19 and the contact portion 62 being a radius R2. When the angle between the tangent line SL2 at the position corresponding to the contact portion 62 of the virtual circle KC2 and the tangent line SL3 of the contact portion 62 on the curved surface 61c of the retaining stone 6 is θ3, the angle θ3 is
θ3 ≧ 0 ° (4)
It is set to satisfy.
The angle θ3 may be an angle between the tangent line SL2 at a position corresponding to the contact portion 62 of the virtual circle KC2 and the back surface 73 of the tooth portion 2a.

  By forming the curved surface 61c of the retaining stone 61 so that the angle θ3 satisfies Expression (4), when the curved surface 61c of the retaining stone 61 contacts the back surface 73 of the tooth portion 2a, the restoring force of the return spring 22 is restored. Thus, the component force F4 of the pressing force F3 that the stop stone 61 presses the tooth portion 2a acts toward the rotation direction of the escape wheel 2 (arrow CW1 direction). Thereby, the rotational torque of the escape wheel 2 is increased. The increased rotational force of the escape wheel & pinion 2 is further transmitted to the balance with hairspring 5 through the flutes 3.

More precisely, since the angle θ3 is defined by the friction coefficient μ at the contact portion between the reeving corner 76 of the tooth portion 2a and the back surface 61c of the retaining stone 61,
tan θ3> μ (5)
Is preferably set.

  Therefore, according to the second embodiment described above, the same effects as those of the first embodiment described above can be achieved. In addition, in the contact state of the back surface of the tooth portion and the back surface of the stop stone, the portion that contacts the tooth portion 2a of the stop stone 61 is a curved surface 61c, so that the escape wheel 2 is rotated to stop the tooth portion 2a. Even when the contact angle with the stone 61 changes, the direction of the force applied to the tooth portion 2a by the stop stone 61 can be made almost constant. For this reason, when transmitting the restoring force of the return spring 22 to the balance 5 via the escape wheel 2, the torque fluctuation of the escape wheel 2 does not occur, the energy transmission efficiency is excellent, and there is no fluctuation. Thus, the detent escapement 1 and the mechanical timepiece 100 capable of transmitting energy can be provided.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG.
FIG. 19 is an enlarged view of a main part of the detent escapement according to the third embodiment, and shows a contact state of the back of the tooth part and the back of the stone.
As shown in the figure, the difference between the second embodiment described above and the third embodiment is that the shape of the tooth portion 2a of the escape wheel 2 of the second embodiment is different from that of the third embodiment. The shape of the tooth portion 82 of the hand wheel 2 is different.

That is, the tooth portion 82 of the escape wheel & pinion 2 according to the third embodiment has a tooth tip surface 74, while the back surface 73 of the tooth portion 82 has a recess 83 formed on the tooth tip surface 74 side. . That is, a recess 83 is formed in a portion of the back surface 73 of the tooth portion 82 that contacts the retaining stone 61 of the operating lever 23. The recessed portion 83 is formed in a gentler curved shape than the curved surface 61c of the retaining stone 61, and the recessed portion 83 and the retaining stone 61 are in line contact with each other.
Here, the tangent line SL4 of the concave portion 83 in the contact portion 83a that is in line contact with the tangent line SL3 corresponding to the contact portion 83a of the curved surface 61c of the retaining stone 61 is coincident. The angle θ4 between the tangent line SL4 and the tangent line SL2 at the position corresponding to the contact part 83a of the virtual circle KC2 is
θ4 ≧ 0 ° (6)
It is set to satisfy. By satisfying Expression (6), when the curved surface 61c of the retaining stone 61 comes into contact with the concave portion 83 of the tooth portion 82, the amount of the pressing force F5 that the retaining stone 61 presses the tooth portion 82 by the restoring force of the return spring 22 is obtained. The force F6 acts toward the rotation direction of the escape wheel 2.

More strictly, the angle θ4 is defined by the friction coefficient μ at the contact portion 83a between the concave portion 83 of the tooth portion 82 and the curved surface 61c of the retaining stone 61.
tan θ4> μ (7)
Is preferably set.

  Therefore, according to the third embodiment described above, in addition to the same effects as those of the second embodiment described above, the tooth thickness of the tooth portion 82 of the escape wheel 2 can be set thick. Thus, the detent escapement 1 and the mechanical timepiece 100 in which the strength of the second tooth portion 82 is increased can be provided.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG.
FIG. 20 is an enlarged view of a main part of the detent escapement according to the fourth embodiment, and shows a contact state of the back of the teeth and the back of the stone.
As shown in the figure, the difference between the third embodiment described above and the fourth embodiment is that the shape of the tooth portion 82 of the escape wheel 2 of the third embodiment and the fourth embodiment are different. The shape of the tooth portion 84 of the hand wheel 2 is different.

In other words, the tooth portion 84 of the escape wheel & pinion 2 according to the fourth embodiment is formed with a curved surface 85 whose back side bulges in a curved shape, and the tooth portion 84 and the retaining stone 61 are in line contact with each other. It is like that.
Here, the tangent line SL5 of the curved surface 85 in the contact portion 85a in line contact with the tangent line SL3 corresponding to the contact portion 83a of the curved surface 61c of the retaining stone 61 is coincident with the tangent line SL3. The angle θ5 between the tangent line SL5 and the tangent line SL2 at a position corresponding to the contact portion 83a of the virtual circle KC2 is
θ5 ≧ 0 ° (8)
It is set to satisfy. By satisfying Expression (8), when the curved surface 61c of the retaining stone 61 comes into contact with the curved surface 85 of the tooth portion 84, the retaining force 61 of the retaining stone 61 presses the tooth portion 84 by the restoring force of the return spring 22. The component force F8 acts toward the rotation direction of the escape wheel 2.

  Therefore, according to the above-described fourth embodiment, in addition to the same effects as those of the above-described second embodiment, since the tooth portion 84 can be set small, the moment of inertia of the escape wheel 2 is reduced, and more It is possible to provide the detent escapement 1 and the mechanical timepiece 100 with improved rotational torque of the escape wheel 2 and more excellent energy transmission efficiency.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIG.
FIG. 21 is a plan view of the detent escapement according to the fifth embodiment. FIG. 21A shows that the escape wheel 2 and the operating lever 23 are engaged, and the escape wheel 2 is stopped. (B) shows a state in which the restoring force of the return spring 22 is transmitted to the escape wheel 2 via the operating lever 23.
Here, as shown in FIG. 21 (a), the difference between the first embodiment and the fifth embodiment is that the operating lever 23 of the fifth embodiment has an assist stone separately from the stop stone 6. 86 is provided.

The assist stone 86 is provided near the retaining stone attachment portion 29 of the arm portion 28 of the operation lever 23. The assist stone 86 is for transmitting the restoring force of the return spring 22 to the escape wheel 2 and increasing the rotational torque of the escape wheel 2.
That is, as shown in FIG. 21 (b), when the actuating lever 23 displaced in a direction away from the escape wheel 2 is returned to the original position by the restoring force of the return spring 22 (in FIG. 21 (b)). The assist stone 86 and the tooth portion 2a of the escape wheel 2 are in contact with each other.

Here, the detailed position of the tooth portion 2a that contacts the assist stone 86 may be any position on the back surface 73, the locking corner 75, and the leaving corner 76 (see FIG. 4).
When the assist stone 86 and the tooth portion 2a are in contact with each other, the tooth portion 2a and the retaining stone 6 are kept away from each other and are not in contact with each other.

  Therefore, according to the fifth embodiment described above, the restoring force of the return spring 22 can be transmitted to the escape wheel 2 without using the stop stone 6. For this reason, the variation of the detent escapement 1 can be increased, and it becomes possible to provide various detent escapement 1 according to a specification.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described with reference to FIG.
FIG. 22 is a plan view of the detent escapement according to the sixth embodiment. FIG. 22A shows the escape wheel 2 stopped by the engagement of the escape wheel 2 and the operating lever 23. (B) shows a state in which the restoring force of the return spring 22 is transmitted to the escape wheel 2 via the operating lever 23.
Here, as shown in FIG. 22 (a), the difference between the fifth embodiment described above and the sixth embodiment is that the operating lever 23 is provided with an assist pin 87 instead of the assist stone 86. There is in point.

That is, an assist pin 87 is provided on the arm portion 28 of the operating lever 23 near the retaining stone mounting portion 29. The assist pin 87 is for transmitting the restoring force of the return spring 22 to the escape wheel 2 and increasing the rotational torque of the escape wheel 2.
That is, as shown in FIG. 22B, when the actuating lever 23 displaced in the direction away from the escape wheel 2 is returned to the original position by the restoring force of the return spring 22 (in FIG. 22B). The assist pin 87 and the tooth portion 2a of the escape wheel 2 are in contact with each other.

Here, the detailed position of the tooth portion 2a that contacts the assist pin 87 may be any position of the back surface 73, the locking corner 75, and the leaving corner 76 (see FIG. 4).
When the assist pin 87 and the tooth portion 2a are in contact with each other, the tooth portion 2a and the retaining stone 6 are kept away from each other and are not in contact with each other.
Therefore, according to the above-described sixth embodiment, the same effects as in the above-described fifth embodiment can be achieved.

In the above-described fifth embodiment, the case where the restoring force of the return spring 22 is transmitted to the escape wheel 2 using the assist stone 86 separately instead of the stop stone 6 has been described. Further, in the above-described sixth embodiment, the case where the restoring force of the return spring 22 is transmitted to the escape wheel 2 using the assist pin 87 separately instead of the stop stone 6 has been described.
However, the configuration is not limited to this, and any configuration may be used as long as the restoring force of the return spring 22 is separately transmitted to the escape wheel 2 instead of the stop stone 6. That is, a restoring force transmission device that transmits the restoring force of the return spring 22 to the escape wheel 2 may be separately provided on the base plate 102 instead of on the operation lever 23.

The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where the tooth portions 2 a and 82 of the escape wheel 2 have the tooth tip surface 74 has been described. However, the present invention is not limited to this, and as shown in FIG. 23, the escape wheel 2 does not have the tooth tip surface 74 and does not have the leaving corner 76 and has only the locking corner 75. 92 may be formed.

1 Detent escapement (Detent escapement for watches)
2 Spur wheel 2a, 82, 84 Tooth part 3 Rolling stone 4 Removal stone 5 Balance 6, 61 Stopping stone 6a, 61a Stop surface 6b Bottom surface 6c, 61b Side surface 6d Back surface (stop stone back surface)
6e Rocking corner (third corner)
6f leaving corner (fourth corner)
9 Spring 19 Shaft 22 Return Spring 23 Actuating Lever 61c Curved Surface (Curved Surface)
62, 83a, 85a Contact portion 71 Contact surface 73 Back surface (back surface of tooth portion)
75 Rocking corner (first corner)
76 leaving corner (second corner)
78 Round chamfered portion 83 Recessed portion 85 Curved surface 86 Assist stone (projection portion)
87 Assist pin (protrusion)
105 Front wheel train 111 Mainspring KC1, KC2 Virtual circle R1, R2 Radius SL1, SL2, SL3 Tangent θ1-θ5 Angle

Claims (10)

With escape wheel,
A balance with a pallet that can come into contact with the teeth of the escape wheel and a removal stone, and a balance that freely vibrates around the balance,
An operating lever having a stop stone that can come into contact with the tooth portion of the escape wheel, and being supported so as to be able to contact and separate from the escape wheel;
A return spring that urges the operating lever to return to its original position;
A restoring force transmitting means for transmitting the restoring force of the return spring biased by the operating lever that is displaced along with the free vibration of the balance with the escape wheel,
A watch detent escapement characterized in that the restoring force transmitted by the restoring force transmitting means is used to increase the rotational torque of the escape wheel and further transmit this rotational torque to the balance. The restoring force transmitting means is shared by the operating lever and the retaining stone,
The detent escapement for a timepiece according to claim 1, wherein the restoring force is transmitted to the escape wheel via the operating lever and the retaining stone. The restoring force transmitting means is a protrusion that is erected on the operating lever and that can contact a tooth portion of the escape wheel,
2. The restoration force is transmitted to the escape wheel via the operating lever and the projection part when the projection part contacts a tooth part of the escape wheel. Detent escapement for watches described in 1. At the tip of the tooth portion of the escape wheel, a first corner that contacts the stop stone and a second corner disposed on the opposite side of the first corner from the stop stone are formed.
The stop stone is connected to the stop surface in contact with the first corner, the lower surface of the stop surface opposite to the first corner, the stop surface and the lower surface, and the cancer Having a retaining stone back arranged on the side of the wheel,
3. The timepiece according to claim 2, wherein the restoring force is transmitted to the escape wheel by pressing the back surface of the retaining stone against the second corner portion of the tooth portion of the escape wheel. 4. Detent escapement. The tooth portion of the escape wheel has a contact surface on the side of the stop stone, and a back surface of the tooth portion arranged on the opposite side of the contact surface to the stop stone,
The stop stone is connected to a stop surface that contacts the contact surface, a lower surface disposed on the opposite side of the stop surface from the contact surface, and the stop surface and the lower surface. A disposed stop stone back surface, a third corner portion forming an intersecting ridge line portion between the stop surface and the stop stone back surface, and a fourth corner portion forming an intersecting ridge line portion between the lower surface and the stop stone back surface; Have
The said restoring force is transmitted to the said escape wheel by pressing the said 4th corner | angular part of the said stop stone on the said tooth part back surface of the said escape wheel. Watch detent escapement. The tooth portion of the escape wheel has a contact surface on the side of the stop stone, and a back surface of the tooth portion arranged on the opposite side of the contact surface to the stop stone,
The stop stone is connected to a stop surface that contacts the contact surface, a lower surface disposed on the opposite side of the stop surface from the contact surface, and the stop surface and the lower surface. Having a stop stone back arranged,
The contact portion in a virtual circle centered on the shaft portion of the escape wheel and having a radius as a distance between the shaft portion, the stop stone, and a contact portion with which the tooth portion of the escape wheel contacts. With respect to the tangent line, the back surface of the stop stone is formed to be inclined toward the escape wheel side,
The angle between the back surface of the retaining stone and the tangent is θ1,
When the angle between the back surface of the stop stone and the back surface of the tooth portion of the escape wheel is θ2,
The angle θ1 and the angle θ2 are
θ1 ≧ 0 °
θ2 ≧ 0 °
The watch detent escapement according to claim 2, wherein the watch detent escapement is set to satisfy the following condition. The tooth portion of the escape wheel has a contact surface on the side of the stop stone, and a back surface of the tooth portion arranged on the opposite side of the contact surface to the stop stone,
The stop stone is connected to a stop surface that contacts the contact surface, a lower surface disposed on the opposite side of the stop surface from the contact surface, and the stop surface and the lower surface. Having a stop stone back arranged,
3. The watch detent escapement according to claim 2, wherein a curved surface portion is formed on the back surface of the retaining stone, and the curved surface portion is pressed against the back surface of the tooth portion to transmit the restoring force to the escape wheel. ,
The contact portion in a virtual circle centered on the shaft portion of the escape wheel and having a radius as a distance between the shaft portion, the stop stone, and a contact portion with which the tooth portion of the escape wheel contacts. The angle θ3 between the tangent line at and the tangent line at the contact portion of the curved stone surface is
θ3 ≧ 0 °
The watch detent escapement according to claim 2, wherein the watch detent escapement is set to satisfy the following condition.   The watch detent escapement according to claim 4, wherein rounded chamfered portions are formed in the first corner portion and the second corner portion, respectively.   6. The timepiece detent escapement according to claim 5, wherein round chamfered portions are formed in the third corner portion and the fourth corner portion, respectively. A watch detent escapement according to any one of claims 1 to 9,
The mainspring that constitutes the power source,
A front wheel train that rotates by a rotational force when the mainspring is unwound,
A mechanical timepiece in which the rotation of the front train wheel is controlled by the timepiece detent escapement.

Images