JP2019138654A - Escapement of timepiece - Google Patents

Abstract

To provide the escapement of a timepiece with which it is possible to shorten a blank period of torque transmission from an escape wheel to a pallet and improve the efficiency of torque transmission.SOLUTION: The escapement comprises an escape wheel having teeth 11, and a pallet having an in-claw 21 and an out-claw and oscillating in linkage with a balance wheel. In a range exceeding a prescribed distance D1 along an impulse face 25 of the in-claw 21 from a locking corner 22 of the in-claw 21, there is formed a step surface 23 projecting from the impulse face 25 of the in-claw 21, at which a locking corner 12 of teeth 11 of the escape wheel slides, and in a range exceeding a prescribed distance d1 along an impulse face 15 of the teeth 11 from the locking corner 12 of the teeth 11, there is formed a step surface 13 projecting from the impulse face 15 of the teeth 11, at which a leaving corer 24 of the in-claw 21 slides.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a timepiece escapement.

  A so-called Swiss lever type escapement is known as one type of escapement for a mechanical watch. This escapement has a configuration equipped with an escape wheel, an ankle, and a balance rocking rocker placed on a swing seat, and has high safety and excellent restartability (for example, patent Reference 1).

JP 2013-185982 A

  However, when the ankle claw (entry claw, exit claw) hanging on the tooth of the escape wheel is released (when releasing the stop), that is, the locking corner of the ankle claw (corresponding to the rear side in the rotation direction of the escape wheel) The escape wheel slightly rotates backward when the corner is disengaged from the locking corner of the escape wheel tooth (the front corner in the direction of rotation).

  As a result, the tooth of the escape wheel and the pawl of the ankle are momentarily separated (jumping state of the escape wheel), and torque cannot be transmitted until the locking corner of the escape wheel tooth begins to contact the impulse surface of the ankle claw. A blank period occurs.

  Also, the escape wheel from the escape wheel until the rocking corner of the escape wheel teeth slides on the impact surface of the ankle claw and reaches the leaving corner of the ankle claw (the corner corresponding to the front side in the rotation direction of the escape wheel). The first corner that transmits torque to the escape wheel and the locking corner of the escape wheel teeth move away from the leaving claw of the ankle claw, and the ankle leaving corner slides on the impulse driving surface of the escape wheel and the ankle claw leaving corner. Until the second driving force is reached, the direction of the load from the escape wheel teeth toward the ankle claws changes momentarily between the second impulse for transmitting torque from the escape wheel to the ankle.

  Therefore, even between the first impulse and the second impulse, the tooth of the escape wheel and the nail of the ankle are instantaneously separated (jumping state of the escape wheel), and the leaving corner of the ankle nail is the impulse of the escape wheel. There is a blank period during which torque cannot be transmitted before it begins to contact the surface.

  The present invention has been made in view of the above circumstances, and provides a timepiece escapement that can improve the torque transmission efficiency by shortening the blank period of torque transmission from the escape wheel to the ankle. Objective.

  According to a first aspect of the present invention, there is an escape wheel having a plurality of teeth that rotates around an axis, and a claw that receives a torque from the escape wheel by contact with the teeth while switching between rotation and stop of the escape wheel. And an ankle that swings in conjunction with the balance, and projects from the impact surface of the claw within a range beyond a predetermined distance along the impact surface of the claw from the locking corner of the claw, and the escape wheel This is a timepiece escapement in which a stepped surface on which the locking corners of the teeth slide is formed.

  According to a second aspect of the present invention, there is an escape wheel having a plurality of teeth that rotates about an axis, and a claw that switches between rotation and stop of the escape wheel and receives torque from the escape wheel by contact with the teeth. And an ankle that swings in conjunction with the balance, and protrudes from the tooth impact surface within a range beyond a predetermined distance along the tooth impact surface from the tooth locking corner. It is a timepiece escapement in which a step surface on which a claw leaving corner slides is formed.

  According to the timepiece escapement of the present invention, it is possible to shorten the blank period of torque transmission from the escape wheel to the ankle and improve the torque transmission efficiency.

It is a perspective view which shows the escapement in the portable timepiece (for example, wristwatch) which is one Embodiment of this invention. It is a perspective view which shows the escape wheel of the escapement shown in FIG. It is the enlarged view to which the A section (including the tooth | gear of an escape wheel) in the escape wheel shown in FIG. 2 was expanded. It is a perspective view which shows the ankle of the escapement shown in FIG. It is the enlarged view to which the B section (including the nail | claw of an ankle) shown in FIG. 4 was expanded. It is a schematic diagram showing the state of the first impulse in which the locking corner of the escape wheel teeth slides on the step surface of the ankle nail from the state immediately before the stop release in which the engagement nail of the ankle comes off the escape wheel tooth, Indicates the state immediately before the stop is released. It is a schematic diagram showing the state of the first impulse in which the locking corner of the escape wheel teeth slides on the step surface of the ankle nail from the state immediately before the stop release in which the engagement nail of the ankle comes off the escape wheel tooth, The jumping state of the escape wheel immediately after the stop is released. It is a schematic diagram showing the state of the first impulse in which the locking corner of the escape wheel teeth slides on the step surface of the ankle nail from the state immediately before the stop release in which the engagement nail of the ankle comes off the escape wheel tooth, The start state of the first impulse after the escape wheel jump is shown. From the end of the first impulse state in which the locking corner of the escape wheel teeth slides on the step surface of the hook of the ankle, the second impulse in which the leaving corner of the hook of the ankle slides on the step surface of the tooth of the escape wheel It is a schematic diagram which shows the state of, and shows the state immediately before the state of the 1st impulse is complete | finished. From the end of the first impulse state in which the locking corner of the escape wheel teeth slides on the step surface of the hook of the ankle, the second impulse in which the leaving corner of the hook of the ankle slides on the step surface of the tooth of the escape wheel It is a schematic diagram which shows this state, and shows the jump state of the escape wheel immediately after the state of the first impulse. From the end of the first impulse state in which the locking corner of the escape wheel teeth slides on the step surface of the hook of the ankle, the second impulse in which the leaving corner of the hook of the ankle slides on the step surface of the tooth of the escape wheel It is a schematic diagram which shows this state, and shows the start state of the 2nd impulse after the escape wheel jump. It is the graph which showed the torque transmission rate according to the rotation angle [deg] of the balance with respect to a nail | claw from an escape wheel. It is the graph which showed the torque transmission rate according to the rotation angle [deg] of the balance with respect to the nail | claw from an escape wheel.

  Hereinafter, embodiments of a timepiece escapement according to the present invention will be described with reference to the drawings.

<Escapement configuration>
FIG. 1 is a perspective view showing an escapement 1 in a portable watch (for example, a wristwatch) according to an embodiment of the present invention. FIG. 2 is a perspective view showing an escape wheel 10 of the escapement 1 shown in FIG. 3 is an enlarged view of an A portion (including the tooth 11 of the escape wheel 10) in the escape wheel 10 shown in FIG. 2, and FIG. 4 is a perspective view showing the ankle 20 of the escapement 1 shown in FIG. 5 is an enlarged view of an enlarged B portion (including the nail 21 of the ankle 20) shown in FIG.

  The escapement 1 of the present embodiment is a Swiss lever type escapement provided with an escape wheel 10 and an ankle 20 as shown in FIG. Note that the escape wheel & pinion 10 does not apply torque to other rotating bodies other than the ankle 20. For example, if the escape wheel applies torque to another rotating body such as a balance other than an ankle such as a coaxial escapement, the escape wheel and the ankle must be set to a large size, and It is necessary to increase the rotation angle per vibration. As a result, a larger torque than that of the escapement 1 is required to drive the escape wheel and the ankle.

(Gangi car)
As shown in FIGS. 1 and 2, the escape wheel 10 rotates in the clockwise direction R <b> 1 shown around the axis C <b> 1 by a driving force (torque) applied via a train wheel (not shown). The escape wheel & pinion 10 includes an inner ring portion 10a close to the center portion on the side of the axis C1, an outer ring portion 10b far from the center portion, and four link portions 10c extending radially connecting the inner ring portion 10a and the outer ring portion 10b. A kana 10d is fixed to the inner ring portion 10a, and a driving force is applied to the kana 10d from a train wheel. In the outer ring portion 10b, a plurality of teeth 11 extending outward while being inclined toward the front in the rotational direction (clockwise direction R1) with respect to the radial direction are formed at equal intervals along the circumferential direction. .

  The escape wheel & pinion 10 shown in FIGS. 1 and 2 includes 15 teeth 11. The number of the teeth 11 of the escape wheel & pinion 10 is not limited to 15 in this embodiment, and may be more than 15 or less than 15.

  As shown in FIG. 3, the outwardly facing surface 13 (step surface) of the tooth 11 of the escape wheel 10 is in contact with the input claw 21 and the output claw 26 of the ankle 20, respectively. Torque is applied from the escape wheel 10 to the ankle 20 by pushing the claw 21 and the exit claw 26.

  Here, as shown in FIG. 6 to be described later, within a range that exceeds a predetermined distance d1 along the impulse surface 15 of the tooth 11 from the rocking corner (the front corner in the rotation direction of the escape wheel & pinion) 12 of the tooth 11. A stepped surface that protrudes outward from the impulse surface 15 of the tooth 11 and slides on a leaving corner 24 (see FIG. 4) of an input claw 21 of an ankle 20 and a leafing corner 29 (see FIG. 4) of an output claw 26 described later. 13 is formed.

  Conventionally, the stepped surface 13 is provided with torque on the ankle 20 by sliding the leaving corner 24 and the leaving corner 29 of the ankle 20 instead of the impulse surface 15 on which the leaving corner 24 and the leaving corner 29 of the ankle 20 slide. It is a plane which gives.

  The step surface 13 protrudes most at the edge of the predetermined distance d1 along the impulse surface 15 of the tooth 11 from the rocking corner 12, and the protrusion amount is d2, and the leaving corner of the tooth 11 (the rotation of the escape wheel 10). The protrusion amount is zero at the corners 14 on the rear side in the direction, and the step surface 13 is inclined with respect to the impulse surface 15.

(Uncle)
The ankle 20 switches between the rotation of the escape wheel & pinion 10 in the clockwise direction R1 and the stop to stop the rotation. As shown in FIGS. 1, 4, and 5, the ankle 20 includes an input claw 21 and an output claw 26 that receive torque from the escape wheel 10 by contact with the teeth 11 of the escape wheel 10, and a sao 31.

  The sao 31 is formed with a space called a box 32 through which a rock stone (not shown) that moves in conjunction with a swinging balance (not shown) enters and exits. As the rock stone intermittently enters and leaves the box 32, the ankle 20 swings in the clockwise direction R1 and the counterclockwise direction R2 around the axis C2 in conjunction with the balance. In addition, the ankle 20 imparts rocking energy to the balance via the rocking stone by the torque received from the escape wheel 10.

  As shown in FIG. 6, the input claw 21 of the ankle 20 is a predetermined along the impulse surface 25 of the input claw 21 from the locking corner (corner corresponding to the rear side in the rotation direction of the escape wheel 10) 22 of the input claw 21. A stepped surface 23 that protrudes outward from the impulse surface 25 of the input claw 21 and slides on the locking corner 12 of the tooth 11 of the escape wheel 10 (see FIG. 3) is formed in a range exceeding the distance D1. .

  Conventionally, the stepped surface 23 provides torque from the escape wheel 10 to the ankle 20 by sliding the locking corner 12 of the escape wheel 10 instead of the impulse surface 25 on which the locking corner 12 of the escape wheel 10 slides. It is a plane to do.

  The step surface 23 protrudes most at the end of a predetermined distance D1 from the locking corner 22 along the impulse surface 25 of the input claw 21, and the amount of protrusion is D2, and the leaving corner of the input claw 21 (the escape wheel 10). The protrusion amount is zero at the corner portion 24 corresponding to the front side in the rotation direction, and the step surface 23 is inclined with respect to the impulse surface 25.

  Similarly to the input claw 21, the output claw 26 of the ankle 20 also has a predetermined corner along the impulse surface 30 of the output claw 26 from the locking corner (corner corresponding to the rear side in the rotation direction of the escape wheel 10) 27 of the output claw 26. A stepped surface 28 that protrudes outward from the impulse surface 30 of the exit claw 26 and slides the locking corner 12 of the tooth 11 of the escape wheel 10 is formed in a range exceeding the distance D3.

  The stepped surface 28 conventionally applies torque from the escape wheel 10 to the ankle 20 by sliding the locking corner 12 of the escape wheel 10 instead of the impulse surface 30 on which the locking corner 12 of the escape wheel 10 slides. It is a plane to do.

  The step surface 28 protrudes most at the edge of the predetermined distance D3 from the rocking corner 27 along the impulse surface 30 of the exit claw 26, and the projection amount is D4. The protrusion amount is zero at the corner portion 29 corresponding to the front side in the rotation direction, and the step surface 28 is inclined with respect to the impulse surface 30.

<Action of escapement>
The operation of the escapement 1 of the embodiment configured as described above will be described below. 6, 7, and 8 show the steps of the locking corner 12 of the tooth 11 of the escape wheel 10 from the state just before the stop release in which the engaging claw 21 of the ankle 20 comes off the tooth 11 of the escape wheel 10. FIG. 6 is a schematic diagram showing a state of the first impulse sliding on the surface 23, FIG. 6 is a state immediately before the stop release, FIG. 7 is a jump state of the escape wheel 10 immediately after the stop release, and FIG. 8 is a jump of the escape wheel 10 The start state of the subsequent first impulse is shown. 6 to 8 also show enlarged views of a portion surrounded by an alternate long and short dash line.

  At a certain moment, the input claw 21 of the ankle 20 hits the tooth 11 of the escape wheel 10, and the escape wheel 10 stops its rotation. From this point, the pallet stone pushes the 32 side walls of the ankle 20 by the vibration of the balance, so that the ankle 20 rotates (swings) in the clockwise direction R1 around the axis C2 as shown in FIG. Thereby, the nail | claw 21 begins to remove | deviate from the tooth | gear 11, and will be in the state (state immediately before stop cancellation | release) just before the stop of the escape wheel & pinion 10 is cancelled | released. At this time, the locking corner 12 of the tooth 11 of the escape wheel 10 is in contact with the locking corner 22 of the input claw 21.

  Immediately after this, due to the rotation of the ankle 20 in the clockwise direction R1, the locking corner 22 of the input claw 21 is released from the locking corner 12 of the escape wheel 10 and the stop wheel is released, as shown in FIG. 10 rotates in the clockwise direction R1 by the driving force from the train wheel.

  At this time, the escape wheel & pinion 10 rotates in the counterclockwise direction R2 which is the reverse direction of the original rotation direction (clockwise direction R1) due to the movement of the ankle 20. Thereby, the jump state of the escape wheel & pinion 10 where the teeth 11 of the escape wheel & pinion 10 and the claw 21 of the ankle 20 are instantaneously separated occurs.

  The jumping state of the escape wheel 10 is an instantaneous phenomenon, and the escape wheel 10 immediately returns to the rotation in the clockwise direction R1 due to the driving force from the train wheel, and as shown in FIG. The locking corner 12 begins to contact the stepped surface 23 of the input claw 21 of the ankle 20. Thereafter, when the escape wheel 10 rotates in the clockwise direction R <b> 1, the rocking corner 12 of the escape wheel 10 slides on the step surface 23 of the input claw 21 of the ankle 20 until it reaches the leaving corner 24. Is applied in the clockwise direction R1 (first impulse state).

  9, 10, and 11 show a state in which the locking corner 12 of the tooth 11 of the escape wheel & pinion 10 slides on the stepped surface 23 of the engaging claw 21 of the ankle 20, and the releasing of the engaging claw 21 of the ankle 20 is completed. FIG. 9 is a schematic diagram showing a second impulse state in which the corner 24 slides on the stepped surface 13 of the tooth 11 of the escape wheel 10, FIG. 9 is a state immediately before the end of the first impulse state, and FIG. 10 is a first impulse. 11 shows the jump state of the escape wheel & pinion 10 immediately after this state, and FIG. 11 shows the start state of the second impulse after the escape wheel 10 jumps. 9 to 11 also show enlarged views of a portion surrounded by an alternate long and short dash line.

  When the escape wheel 10 is rotated in the state of the first impulse shown in FIG. 8 and the rocking corner 12 of the escape wheel 10 reaches the leaving corner 24 of the input claw 21 of the ankle 20, as shown in FIG. 10 is the state immediately before the locking corner 12 of the tooth 11 is disengaged from the input claw 21 of the ankle 20 (the state immediately before the end of the first impulse state). At this time, the rocking corner 12 of the tooth 11 of the escape wheel 10 and the leaving corner 24 of the claw 21 of the ankle 20 are in contact with each other.

  Thereafter, the rocking corner 12 of the escape wheel 10 is disengaged from the engaging claw 21 of the ankle wheel 20, but instead, the leaving corner 24 of the engaging claw 21 of the ankle 20 is in contact with the stepped surface 13 of the tooth 11 of the escape wheel 10. . Due to the change of the contact portion, the direction of the load acting on the claw 21 of the ankle 20 from the tooth 11 of the escape wheel & pinion 10 changes instantaneously.

  As a result, as shown in FIG. 10, a jump state of the escape wheel & pinion 10 in which the teeth 11 of the escape wheel & pinion 10 are separated from the claws 21 of the ankle 20 occurs. In the jump state of the escape wheel 10, torque is not transmitted from the escape wheel 10 to the ankle 20, and thus the first impulse state ends at this point.

  The jumping state of the escape wheel 10 is also an instantaneous phenomenon. The escape wheel 10 is rotated in the clockwise direction R1 by the driving force from the train wheel and the movement of the ankle 20 as shown in FIG. The leaving surface 24 of the claw 21 of the ankle 20 starts to contact the step surface 13 of the tooth 11. Thereafter, when the escape wheel 10 rotates in the clockwise direction R <b> 1, the reeving corner 24 of the input claw 21 of the ankle 20 slides on the stepped surface 13 of the escape wheel 10 until reaching the leaving corner 14 of the tooth 11. Then, the escape wheel 10 applies a torque for rotating the ankle 20 in the clockwise direction R1 (second impulse state).

  FIG. 12 is a graph showing a torque transmission rate according to the rotation angle [deg] of the balance from the escape wheel 10 to the entry claw 21, and FIG. 13 is a rotation angle of the balance [deg] from the escape wheel 10 to the exit claw 26. ] Is a graph showing the torque transmission rate according to the above. 12 and 13, broken lines (both dense broken lines and coarse broken lines) indicate those caused by the escapement 1 of the present embodiment, and solid lines indicate those caused by a conventional escapement to which the present invention is not applied (comparative example). . However, the period from the stop start of the escape wheel 10 to the cancellation of the stop is the same as that according to the comparative example and that due to the escapement 1 of the present embodiment, and therefore, both are indicated by solid lines.

  According to the escapement 1 of the first embodiment configured and operated as described above, the stepped surface 23 protruding from the conventional impulse surface 25 of the ankle 20 is formed, and therefore the escape wheel 10 can be released from the stop state. A period (see FIG. 7) from the state (see FIG. 6) to the start of the first impulse state (see FIG. 8) in which the transmission of torque to the nail 21 of the ankle 20 is started (see FIG. 7; Period (blank period during which torque cannot be transmitted)) can be shortened.

  That is, in the escapement 1 of the present embodiment, the first impulse state starts from the state in which the locking corner 12 of the escape wheel 10 starts to contact the stepped surface 23 of the input claw 21 of the ankle 20. In the conventional escapement to which the present invention is not applied (comparative example), the locking corner of the escape wheel starts to come into contact with the impulse surface of the nail of the ankle. Here, the escapement 1 of the present embodiment is formed in a state in which the stepped surface 23 of the input claw 21 of the ankle 20 protrudes from the impulse surface 25 corresponding to the impulse surface of the conventional claw of the ankle. .

  Therefore, the reason why the rocking corner 12 of the jumping escape wheel 10 starts to contact the stepped surface 23 of the input claw 21 of the ankle 20 starts to contact the impulse surface 25 in a state where the stepped surface 23 is not formed. It will be earlier. That is, as shown in FIG. 12, the escapement 1 of the present embodiment (shown by a broken line in FIG. 12) is compared with the comparative example (shown by a solid line in FIG. 12) during the jump state of the escape wheel 10 (stopped). (Period from the release state to the start of the first impulse) can be shortened. As a result, the period of the first impulse for transmitting torque from the escape wheel 10 to the ankle 20 becomes longer, and the torque transmission efficiency can be improved.

  Moreover, since the step surface 23 is longer than the impulse surface 25 from the axis C2 of the ankle 20, the torque applied to the step surface 23 in the first impulse state is greater than the torque applied to the impulse surface 25. As a result, the transmission efficiency of the torque applied to the ankle 20 can be improved.

  Further, according to the escapement 1 of the embodiment configured and operated as described above, the step surface 13 projecting from the conventional impulse surface 15 of the escape wheel 10 is formed, so the state of the first impulse From the end (see FIG. 9) to the start (see FIG. 11) of the second impulse state (sliding between the stepped surface 13 of the tooth 11 of the escape wheel 10 and the leaving corner 24 of the engaging claw 21 of the ankle 20). The period (see FIG. 10; the period of the jump state of the escape wheel & pinion 10 (the blank period during which torque cannot be transmitted)) can be shortened.

  That is, in the escapement 1 of the present embodiment, the start of the second impulse state starts from a state in which the leaving corner 24 of the input claw 21 of the ankle 20 starts to contact the step surface 13 of the tooth 11 of the escape wheel 10. However, in the conventional escapement to which the present invention is not applied (comparative example), the leaving claw of the ankle of the ankle starts to contact the impulse surface of the escape wheel tooth. Here, the escapement 1 of the present embodiment is formed in a state where the stepped surface 13 of the tooth 11 of the escape wheel 10 protrudes from the impulse surface 15 corresponding to the impulse surface of the tooth of the conventional escape wheel. .

  Therefore, the leaving surface 24 of the claw 21 of the ankle 20 starts to come into contact with the stepped surface 13 of the tooth 11 of the jumping wheel 10 in the jump state on the impulse surface 15 in the state where the stepped surface 13 is not formed. The timing is earlier than the start of contact. That is, as shown in FIG. 12, the escapement 1 of the present embodiment (shown by a broken line in FIG. 12) is compared with the comparative example (shown by a solid line in FIG. 12) during the jump state of the escape wheel 10 (first The period from the end of one impulse to the start of the second impulse) can be shortened. As a result, the period of the second impulse for transmitting torque from the escape wheel 10 to the ankle 20 becomes longer, and the torque transmission efficiency can be improved.

  In addition, the step surface 13 is formed to be inclined with respect to the impulse surface 15, and the end edge on the side close to the locking corner 12 is at a position where the distance from the axis C <b> 1 is longer than the locking corner 12. Therefore, the direction of the load applied to the nail 21 perpendicular to the step surface 13 is different from the direction of the load applied to the nail 21 orthogonal to the impulse surface 15. As a result, in the state of the second impulse, the torque applied from the step surface 13 to the input claw 21 of the ankle 20 becomes larger than the torque applied from the impulse surface 15 to the input claw 21 of the ankle 20, The transmission efficiency of torque applied to the ankle 20 can be improved.

  Although the above description is about the relationship between the input claw 21 of the ankle 20 and the escape wheel 10, the escapement 1 of the present embodiment also has a conventional ankle applied to the output claw 26 as well as the input claw 21. 12 is formed between the protruding claw 26 and the escape wheel 10 shown in FIG. 13, since the step surface 28 is formed to protrude outward from the impulse surface 30 corresponding to the impulse surface of the protruding claw. The torque transmission efficiency can be improved by the same action and effect as the improvement of the torque transmission efficiency between the illustrated claw 21 and the escape wheel & pinion 10.

  The escapement 1 of the present embodiment is such that the step surface 13 is formed on the tooth 11 of the escape wheel 10 and the step surfaces 23 and 28 are formed on the input claw 21 and the output claw 26 of the ankle 20, respectively. The escapement of the timepiece according to the present invention is not limited to one in which step surfaces are formed on all the teeth of the escape wheel, the input and output claws of the ankle.

  That is, the escapement of the timepiece according to the present invention may be one in which the step surface 13 is formed only on the tooth 11 of the escape wheel 10 or the step surface 23 is formed only in the engaging claw 21 of the ankle 20. The step surface 28 may be formed only on the output claw 26 of the ankle 20, and among the teeth 11 of the escape wheel 10, the input claw 21 and the output claw 26 of the ankle 20, At least two stepped surfaces that protrude from the impulse surface may be formed. According to any of these aspects, each effect described in the embodiment can be obtained.

  It should be noted that the duration of operation of the balance can be extended by improving the torque transmission efficiency from the escape wheel to the ankle.

  In the escapement 1 of the embodiment described above, the step surface 13 is not formed in the range of the predetermined distance d1 from the locking corner 12 of the tooth 11 of the escape wheel 10, but the step surface 13 is formed in this range. However, since the jump state of the escape wheel & pinion 10 cannot be substantially shortened, it is not meaningful to form the step surface 13 in this range.

  On the other hand, by not forming the stepped surface 13 in this range, it is possible to save material in that range, which can contribute to weight reduction and manufacturing cost reduction.

  Similarly, the step surface 23 is not formed in the range of the predetermined distance D1 from the locking corner 22 of the input claw 21 of the ankle 20, and the step surface 28 is formed in the range of the predetermined distance D3 from the locking corner 27 of the output claw 26. Even if not, it can contribute to weight reduction and manufacturing cost reduction.

  The escapement 1 according to the present embodiment includes impact surfaces 15, 25, 30 (the locking corner 12 of the tooth 11 of the escape wheel 10, the locking corner 22 of the input claw 21 of the ankle 20, and the locking corner 27 of the output claw 26 of the ankle 20. ), The stepped surfaces 13, 23, and 28 are formed so as to shorten the jump state period of the escape wheel & pinion 10, respectively. However, it is adopted as a structure for shortening or eliminating the jump period. Compared to the rounding (R-shaped) of the rocking corner and the leaving corner, there is an index representing the safety factor of catching between the teeth 11 of the escape wheel 10 and the claws 21 and 26 of the ankle 20 in the rocking corner and the leaving corner. There is no reduction in the amount of safety and stoppage.

1 escapement 10 escape wheel 11 tooth 12, 22 locking corner 13, 23 step surface 14, 24 leaving surface 15, 25 impulse surface 20 ankle 21 entry claw 26 exit claw R1 clockwise direction R2 counterclockwise direction

Claims (5)

An escape wheel with a plurality of teeth rotating about an axis;
An ankle that switches between rotation and stop of the escape wheel and has a claw that receives torque from the escape wheel by contact with the teeth, and swings in conjunction with a balance.
A stepped surface that protrudes from the claw impulse surface and slides on the toothed corner of the escape wheel is formed in a range that exceeds a predetermined distance along the claw impulse surface from the claw locking corner. Watch escapement.   2. The timepiece escapement according to claim 1, wherein the stepped surface formed on the claw protrudes most at an end edge of the claw close to a locking corner, and the protruding amount is zero at the claw leaving corner.   A stepped surface that protrudes from the tooth impact surface and slides on the reaming corner of the claw of the ankle is formed in a range exceeding a predetermined distance along the tooth impact surface from the tooth locking corner. Item 3. An escapement for a timepiece according to item 1 or 2. An escape wheel with a plurality of teeth rotating about an axis;
An ankle that switches between rotation and stop of the escape wheel and has a claw that receives torque from the escape wheel by contact with the teeth, and swings in conjunction with a balance.
A timepiece in which a step surface protruding from the tooth impact surface and sliding on the leaving corner of the ankle claw is formed in a range exceeding a predetermined distance along the tooth impact surface from the tooth locking corner. Escapement.   5. The timepiece escapement according to claim 3, wherein the stepped surface of the tooth protrudes most at an end edge of the tooth close to the rocking corner, and the protruding amount is zero at the leaving corner of the tooth.