JP6334217B2 - Wheel train mechanism, movement and watch - Google Patents

Description

  The present invention relates to a train wheel mechanism, a movement, and a timepiece.

  A so-called “backlash”, which is a gap intentionally provided in the rotation direction, is set between gears that transmit power from a power source and mesh with each other and rotate. And since the friction between the tooth surfaces of the meshing gear is moderately suppressed by the backlash, the gear rotates.

Thus, the backlash is indispensable for rotating the gears, but due to the gap set as backlash, the gears rotate unintentionally within the range of the gap, It may cause so-called “rattle”.
Due to this “rattle”, for example, in a fourth wheel with a second hand attached, a phenomenon of so-called “wobble” occurs in which the second hand unintentionally rotates clockwise or counterclockwise.

More specifically, in the fourth wheel and the like to which the second hand is attached, the moment of inertia of the entire gear is increased by integrating the second hand and the fourth wheel. Due to this increased moment of inertia, the fourth wheel is able to move the gap set as backlash clockwise even after the transmission of power from the power source is stopped (for example, the rotation of the rotor in an analog quartz watch stops). Or it is rotated counterclockwise. This phenomenon is “flickering”.
This wobbling may not occur when the fourth wheel has a small moment of inertia (for example, when a relatively small and light second hand is attached). For example, a large and heavy second hand is attached to the fourth wheel. For example, it is known that the frequency of occurrence increases as the moment of inertia increases.

In recent years, a variety of designs has been required due to market demands, and in order to achieve this, it is required to mount larger and heavier pointers on the movement.
If the moment of inertia acting on the fourth wheel is further increased by mounting a larger and heavier pointer, the fourth wheel will continue to rotate even after rotating by the gap set as backlash. Further, the fourth wheel hits the tooth tip of the following wheel train (for example, the fifth wheel, etc.), rotates the train wheel, and then opposes the reaction force (reaction) received from the train wheel by the collision. It may rotate in the direction and stop. As the fourth wheel is rotated in the clockwise or counterclockwise direction in the range in which it collides with the gap and the train wheel set as backlash and rotates in the opposite direction, the “stagger” is increased.

  Furthermore, if a large moment of inertia is applied to the rotating fourth wheel by mounting a larger and heavier pointer, the fourth wheel stops randomly within the clearance set as backlash. The stop position of the second hand is not stable, and the second hand instruction unevenness increases, leading to uneven hand movement.

  In view of this, there has been proposed a mechanism for suppressing the movement of unevenness for suppressing the fluctuation of the pointer, the unevenness of the operation of the needle, and the like. As a needle movement unevenness suppression mechanism, for example, as disclosed in Patent Document 1 below, a configuration is disclosed that includes a pointer suppression spring that presses a pointer gear against a train wheel receiving side in the axial direction. Specifically, the pointer restraining spring presses the pointer gear toward the train wheel receiving side from the ground plate side in the axial direction at the other end portion between the bent portion sandwiched between the train wheel bridge and the ground plate at one end portion. And a pressing portion.

  According to this configuration, when the train wheel bridge is assembled to the base plate, the train wheel bridge is assembled to the ground plate while pressing the bent portion of the pointer suppression spring, so that a biasing force is applied to the pointer suppression spring. Thereby, the sliding force according to the urging | biasing force of the pointer suppression spring is provided with respect to the pointer gear by pressing the pointer gear toward the train wheel bridge by the pressing portion of the pointer suppression spring. As a result, it is considered that when the needle movement is stopped, the pointer gear can be prevented from rotating in the direction of closing backlash due to inertia, and the above-described wobbling of the pointer, uneven movement of the needle, and the like can be suppressed. In Patent Document 1 below, the train wheel bridge contacts the bent portion in a state where the pointer gear meshes with the transmission gear and the shaft portion (tenon) of the pointer gear is inserted into the shaft support hole of the train wheel bridge. Thus, the length of the shaft portion is set.

JP 2003-215267 A

Recently, it has been studied to further reduce the thickness of the timepiece (movement) by shortening the shaft length of the shaft portion or the like.
However, in the configuration of Patent Document 1 described above, when the shaft portion is shortened, the train wheel bridge is received before the train wheel bridge is assembled to the main plate (before the shaft portion is inserted into the shaft support hole of the train wheel bridge). By contacting the bent portion of the pointer restraining spring, the pointer gear may be pressed against the wheel train receiving side. As a result, the assembling property may be lowered, such as the meshing between the pointer gear and the transmission gear is disengaged, or the shaft portion of the pointer gear is not inserted into the shaft support hole of the train wheel bridge.
In particular, in the configuration of Patent Document 1, when the train wheel bridge is assembled, the pointer gear and the transmission gear are covered with the train wheel bridge, so the positions of the transmission gear and the shaft support hole with respect to the pointer gear cannot be visually observed. . This is also a factor in the decrease in assemblability.

  An object of the present invention is to provide a gear train mechanism, a movement, and a timepiece capable of realizing a reduction in thickness and an improvement in assembling performance while suppressing wobbling, uneven hand movement, and the like due to gear inertia.

In order to solve the above problems, the following means were adopted.
The gear train mechanism of the present invention includes a gear having both ends of an axle rotatably supported with respect to the mounting portion, a pressing member held by the mounting portion so as to press a flat portion of the gear, and the gear. However, it is characterized by comprising a pressing force applying portion that presses the pressing member toward the flat portion of the gear in a state assembled to the mounting portion and applies a pressing force to the pressing member.

According to this structure, the sliding resistance according to the pressing force of a press member is provided with respect to the plane part of a gear by pressing a gear with a press member. Thereby, at the time of a hand movement stop, it can suppress that a gear rotates between the backlashes set between the gear and the transmission gear by inertia. As a result, it is possible to suppress wobbling, uneven hand movement, and the like.
In particular, in the state where the gear is assembled to the mounting portion, the pressing member is pressed toward the plane portion of the gear, and the pressing force applying portion for applying the pressing force to the pressing member is provided, so that the axle is assembled to the mounting portion. It is possible to suppress the gear from being pressed by the pressing member before. As a result, it is possible to prevent the gear from rattling at the time of assembling the mounting portion, so that it is possible to improve the assemblability while reducing the thickness of the axle such as by shortening the axle length.

In the train wheel mechanism according to the present invention, the pressing member may be elastically deformable, and the pressing force applying unit may urge the pressing member toward the gear.
According to this configuration, a stable pressing force can be applied to the gear by biasing the pressing member toward the gear.

In the train wheel mechanism of the present invention, the pressing member may press the gear in a direction along the axis.
According to this configuration, by pressing the gear in the direction along the shaft center, it is possible to suppress the shaft shake of the axle and the like to stably rotate the gear.

In the train wheel mechanism of the present invention, the pressing force applying part may be provided on a battery plus terminal disposed outside the attaching part, and the pressing member may be pressed through the attaching part.
According to this configuration, since the pressing force applying portion is provided on the existing battery plus terminal, an increase in the number of parts can be suppressed.

Further, in the train wheel mechanism according to the present invention, the pressing force applying part may be provided on a back object holder disposed outside the attaching part, and the pressing member may be pressed through the attaching part.
According to this structure, since the pressing force application part is provided in the existing back object holder, the increase in the number of parts can be suppressed.

In the train wheel mechanism according to the present invention, the pressing force applying portion is formed on the mounting portion, the pressing member can be locked, and the pressing member has the gear mounted on the mounting portion. In this state, it may be configured to be movable toward a locking position locked to the pressing force applying portion.
According to this configuration, an increase in the number of parts can be suppressed by providing the attaching portion with the pressing force application portion.

The movement according to the present invention includes the above-described train wheel mechanism according to the present invention and a power source that applies a rotational force to the train wheel mechanism.
A timepiece according to the present invention includes the above-described movement according to the present invention.
According to this configuration, it is possible to provide a high-quality and thin movement and timepiece in which hand movement unevenness is suppressed.

  According to the present invention, it is possible to realize a reduction in thickness and an improvement in assembling performance while suppressing wobbling, uneven hand movement, and the like due to gear inertia.

1 is an external view showing a timepiece 1 according to an embodiment. It is the fragmentary top view which looked at the movement 10 which concerns on 1st Embodiment from the front side. 1 is a sectional view of a movement 10. FIG. 3 is a cross-sectional view showing an assembly process of the movement 10. FIG. 3 is a perspective view showing an assembly process of the movement 10. FIG. It is sectional drawing which shows the assembly process of the movement 10 following FIG. It is a perspective view which shows the movement 10 assembly process following FIG. It is a fragmentary sectional view showing movement 110 concerning a 2nd embodiment. FIG. 10 is a partial cross-sectional view showing an assembly process of the movement 110. It is sectional drawing which shows the movement 210 which concerns on 3rd Embodiment. It is the perspective view which looked at the movement 210 which concerns on 3rd Embodiment from the front side. FIG. 10 is a cross-sectional view showing an assembly process of the movement 210. FIG. 5 is a perspective view showing an assembly process of the movement 210.

  Embodiments of the present invention will be described with reference to the drawings. In the present embodiment, an analog quartz watch will be described as an example.

<First Embodiment> [Clock]
In general, a machine body including a driving part of a timepiece is referred to as a “movement”. A state in which a dial and a pointer are attached to the movement, and the dial is put into a watch case to form a finished product is referred to as “complete” of the watch.
Of the both sides of the base plate constituting the base of the watch, the side of the watch case with the glass, that is, the side with the dial is referred to as the “back side” of the movement. Of the two sides of the main plate, the side of the watch case with the case back, that is, the side opposite to the dial is referred to as the “front side” of the movement.

FIG. 1 is an external view showing a timepiece 1 according to an embodiment of the present invention.
As shown in FIG. 1, the complete timepiece 1 includes a movement 10, a dial 11, and hands 12 to 14 inside a timepiece case 3 made of a case back cover (not shown) and glass 2.
The dial plate 11 has at least a scale indicating information about time. The hands 12 to 14 include an hour hand 12 indicating the hour, a minute hand 13 indicating the minute, and a second hand 14 indicating the second.

[Clock movement, train wheel mechanism]
FIG. 2 is a plan view of the movement 10 according to the first embodiment of the present invention as viewed from the front side. FIG. 3 is a cross-sectional view of the movement 10.
As shown in FIGS. 2 and 3, the movement 10 includes a main plate 20 and a train wheel bridge 29 (see FIG. 3, an example of the “attachment portion” of the present invention).
As shown in FIG. 3, a battery plus terminal 28 that covers the train wheel bridge 29 from the front side is disposed on the front side of the train wheel bridge 29. The battery plus terminal 28 is fastened together with the main plate 20 and the train wheel bridge 29 by a set screw 30.

The main plate 20 constitutes the base of the movement 10.
On the back side of the main plate 20, the above-described dial 11 is disposed so as to be visible through the glass 2. The ground plane 20 is provided with a crystal unit, a circuit board, a step motor (power source), a battery, a train wheel mechanism 23, and the like (not shown).

The crystal unit has a crystal resonator that oscillates at a predetermined frequency and is connected to the circuit board described above.
In the battery, the positive electrode and the plus pattern of the circuit board are conducted through the battery plus terminal 28 described above, and the minus electrode and the minus pattern of the circuit board are conducted through a battery minus terminal (not shown).
The circuit board is composed of, for example, a C-MOS or PLA, and an oscillation unit (oscillator) that outputs a reference signal based on vibration of a crystal resonator, and a frequency dividing unit that divides the output signal of the oscillation unit (Divider) and a drive unit (driver) that outputs a motor drive signal for driving the step motor based on the output signal of the frequency divider.
The step motor applies rotational force to the fifth wheel & pinion 40 described later, and includes a coil block, a stator and a rotor not shown.

As shown in FIGS. 2 and 3, the train wheel mechanism 23 includes a fifth wheel 40, a fourth wheel 41, a third wheel 42 (see FIG. 2), a second wheel 43, and a minute wheel 55 (see FIG. 2). ), The hour wheel 44 (see FIG. 3), and the hand movement unevenness suppressing mechanism 31.
The fifth wheel & pinion 40 rotates based on the rotation of the step motor (rotor) described above. The fourth wheel 41 rotates based on the rotation of the fifth wheel 40. The third wheel & pinion 42 rotates based on the rotation of the fourth wheel & pinion 41. The second wheel & pinion 43 rotates based on the rotation of the third wheel & pinion 42. The minute wheel 55 rotates based on the rotation of the center wheel & pinion 43. The hour wheel 44 rotates based on the rotation of the minute wheel 55.

  The fifth wheel (transmission gear) 40 has a fifth gear 40 a and a fifth upper pinion 40 b and is rotatably supported by the main plate 20 and the train wheel bridge 29. That is, in the fifth wheel & pinion 40, the upper shaft portion is pivotally supported by the bearing portion of the train wheel bridge 29, and the lower shaft portion is pivotally supported by the bearing portion of the main plate 20. The fifth gear 40a meshes with the rotor of the step motor. Thereby, the fifth wheel & pinion 40 rotates with the rotation of the rotor.

As shown in FIG. 3, the fourth wheel 41 is arranged between the fifth wheel 40 and the third wheel 42 (see FIG. 2), and has an axle 60, a fourth lower pinion 61, and a fourth gear 62. ing.
The axle 60 is supported so as to be rotatable about the axis O with respect to the main plate 20 and the train wheel bridge 29. The fourth lower pinion 61 is formed on the axle 60, and the fourth gear 62 is fixed to the axle 60. In the following description, the direction along the axis O of the fourth wheel 41 (axle 60) is defined as the axial direction, and in the axial direction, the train wheel bridge 29 side (front side) is the upper side and the main plate 20 side (back side) is the upper side. Sometimes called down.

The axle 60 is rotatably inserted into the second wheel 43 with the fourth pinion 61 positioned above the upper opening end of the second wheel 43. The upper shaft portion 60 a of the axle 60 is pivotally supported by the tenon frame 63 of the train wheel bridge 29.
The tenon frame 63 has a disk shape made of a material (for example, a metal material) harder than the train wheel bridge 29 (for example, a resin material), and is fitted into a bearing hole 64 provided in the wheel train bridge 29. . A through hole 63a penetrating in the axial direction is formed in the center portion of the tenon frame 63, and the upper shaft portion 60a of the axle 60 is rotatably inserted into the through hole 63a.

  A lower shaft portion 60b of the axle 60 projects downward from the center wheel 43, and a second hand (pointer) 14 is attached to the projecting portion. The fourth lower pinion 61 meshes with the third gear 42a (see FIG. 2) of the third wheel 42.

  The fourth gear (gear) 62 is located above the lowermost pinion 61 and is fixed to the axle 60 by, for example, driving and fixing. The fourth gear 62 meshes with the fifth upper kana 40 b of the fifth wheel 40. As a result, the fourth wheel 41 rotates with the rotation of the fifth wheel 40.

As shown in FIG. 2, the third wheel & pinion 42 has a third gear 42 a and a third lower pinion (not shown), and is rotatably supported by the main plate 20 and the train wheel bridge 29.
The third gear 42 a meshes with the lowermost pinion 61 (see FIG. 3) of the fourth wheel 41. Thereby, the third wheel & pinion 42 rotates with the rotation of the fourth wheel & pinion 41.

As shown in FIGS. 2 and 3, the second wheel & pinion 43 is arranged coaxially with the axis O of the fourth wheel & pinion 41 and is rotatably attached to a cylindrical portion 52 disposed on the main plate 20. The second wheel & pinion 43 has a second gear 43a that meshes with the third lower pinion of the third wheel & pinion 42. Thereby, the center wheel & pinion 43 rotates with the rotation of the center wheel & pinion 42.
The second wheel & pinion 43 is configured to be rotated once per hour while the minute hand 13 is attached to the lower end portion. The minute hand 13 is located closer to the dial 11 than the second hand 14 attached to the fourth wheel & pinion 41.

The hour wheel 44 is disposed coaxially with the axis O of the fourth wheel 41 and is rotatably inserted into the cylindrical portion 52. The hour wheel 44 has a cylindrical gear 44 a that meshes with the center wheel & pinion 43 via a minute wheel 55 (see FIG. 2) and the like. Thereby, the hour wheel 44 rotates based on the minute wheel 55.
The hour wheel 44 is attached to the hour hand 12 and is configured to rotate once in 12 hours. The hour hand 12 is located closer to the dial 11 than the minute hand 13.

As shown in FIGS. 1 and 2, a winding stem 24 is rotatably incorporated in a winding stem guide hole 25 (see FIG. 2) formed in the main plate 20. The winding stem 24 is used for time adjustment for rotating the minute hand 13 and the hour hand 12 to correct the time display (hour and minute display). A crown 53 (see FIG. 1) located on the side of the watch case 3 is attached to the tip of the winding stem 24.
As shown in FIG. 2, the winding stem 24 can be pulled out stepwise in its extending direction, and includes a setting lever 56, a crown 57, a crown spring (not shown) and the like disposed on the front side of the main plate 20. The position in the extending direction is determined by the switching device 54.

  When the minute wheel 55 is rotated while the winding stem 24 is pulled out, it rotates via the pinion wheel 58 and the small iron wheel 59. When the minute wheel 55 rotates, the second wheel 43 and the hour wheel 44 are configured to rotate. Thereby, time adjustment is possible.

[Handle unevenness suppression mechanism]
Here, as shown in FIGS. 2 and 3, the hand movement unevenness suppressing mechanism 31 of the present embodiment includes a pressing member 70 that can press the fourth wheel 41, a support portion 80 that supports the pressing member 70, and a pressing member. A pressing force applying unit 90 that presses 70 toward the fourth gear 62 and applies a pressing force to the pressing member 70.

First, the support portion 80 includes a support base 81 formed on the upper surface of the main plate 20 and a pair of guide pins 82 a and 82 b erected from the support base 81.
The support base 81 extends along one direction C from the outer peripheral side of the main plate 20 toward the inner peripheral side (the fourth wheel 41 side) among the in-plane directions orthogonal to the axis O. Specifically, the upper surface of the support base 81 is an inclined surface that extends upward from the outer peripheral side along the one direction C toward the inner peripheral side. Note that the support base 81 is not limited to the inclined surface, and the outer peripheral side may be positioned above the inner peripheral side. As shown in FIG. 2, the one direction C described above overlaps with the fourth wheel & pinion 41 while being offset with respect to the axis O.

  As shown in FIGS. 2 and 3, the guide pins 82 a and 82 b are separately arranged on the outer peripheral side and the inner peripheral side on the support base 81. The upper ends of the guide pins 82a and 82b are housed separately in the housing holes 85a and 85b formed in the train wheel bridge 29, respectively.

  The pressing member 70 is an elongated metal member extending along one direction C, and is elastically deformable along the thickness direction. Specifically, the pressing member 70 includes a pressing portion 71, a flexible portion 72, and a fixed portion 73 that are continuously provided from the distal end side (inner circumferential side in one direction C) to the proximal end side (outer circumferential side in one direction C). Have

The pressing portion 71 has a curved shape projecting upward, and presses the lower end surface (lower end surface (planar portion) 62b) of the fourth gear 62 so as to be slidable from below.
The flexible portion 72 is a portion of the pressing member 70 that is connected to the proximal end side with respect to the pressing portion 71 and is the longest elongated portion of the pressing member 70. The flexible portion 72 is bent in a state where the central portion bulges upward, and urges the pressing portion 71 toward the fourth gear 62.

  In the pressing member 70, the fixed portion 73 is connected to the base end side with respect to the flexible portion 72, and almost the entire surface thereof is supported on the support base 81 of the base plate 20. Accordingly, the fixed portion 73 is supported on the support base 81 in an inclined state upward from the outer peripheral side along the one direction C toward the inner peripheral side (the fourth wheel 41 side). Further, in one direction C, support holes 73 a and 73 b that penetrate the pressing member 70 in the thickness direction are formed at both ends of the fixed portion 73. The above-described guide pins 82a and 82b are inserted into the support holes 73a and 73b, respectively. Thereby, positioning of the pressing member 70 with respect to the ground plane 20 is performed in the in-plane direction orthogonal to the axial direction.

  The pressing force applying portion 90 is formed in a portion of the battery plus terminal 28 that overlaps with the base end portion of the fixed portion 73 in the axial direction integrally with the battery plus terminal 28 and has a rod shape that extends downward. ing. The pressing force applying part 90 is inserted into a notch part 29 a formed in the train wheel bridge 29. The lower end portion of the pressing force applying portion 90 extends to a position close to the support base 81 of the base plate 20, and the base end portion (support hole 73 b) of the fixed portion 73 between the support base 81 of the base plate 20. More proximal side).

  Thus, in the pressing member 70, the base end portion of the fixed portion 73 is pressed toward the base plate 20 side (downward) by the pressing force applying portion 90, while the pressing portion 71 is urged upward. Is pressed against the lower end surface 62b of the fourth gear 62. That is, the pressing member 70 is formed between the base plate 20 and the train wheel bridge 29 with the distal end portion (near the support hole 73a) of the fixed portion 73 as a fulcrum, the proximal end portion of the fixed portion 73 as a force point, and the pressing portion 71 as an action point. It is held like a lion.

  In the illustrated example, the distance between the fulcrum and the force point along one direction C and the distance between the fulcrum and the action point are the same. Thereby, a stable pressing force can be reliably applied to the fourth gear 62 via the pressing portion 71. In addition, when securing a pressing force with respect to the fourth gear 62, it is preferable to shorten the distance between the fulcrum and the force point. In order to suppress variations in the pressing force applied to the fourth gear 62, It is preferable to shorten the distance between the fulcrum and the action point.

[Movement assembly process]
Next, an assembly process of the above-described movement 10 will be described. In the following description, the train wheel assembly assembly step of assembling the train wheel bridge 29 to the ground plate 20 after the train wheel mechanism 23 is assembled to the ground plate 20 will be described. FIG. 4 is a cross-sectional view showing an assembly process of the movement 10. FIG. 5 is a perspective view showing an assembly process of the movement 10.

  First, as shown in FIGS. 4 and 5, the pressing member 70 is held in a natural length state below the fourth gear 62 before the train wheel assembly step. Specifically, in the pressing member 70, the pressing portion 71 approaches or abuts the lower end surface 62 b of the fourth gear 62 from below. On the other hand, in the fixed portion 73, the guide pins 82a and 82b are inserted into the support holes 73a and 73b, respectively, and the base end portion is lifted from the support base 81. Therefore, a gap K that allows the downward movement of the fixed portion 73 is formed between the fixed portion 73 and the support base 81. Each wheel of the train wheel mechanism 23 is assembled to the main plate 20 in a meshed state.

FIG. 6 is a cross-sectional view showing an assembly process of the movement 10 subsequent to FIG.
As shown in FIG. 6, in the wheel train assembly step, the upper shaft portion of each wheel (for example, the upper shaft portion 60a of the fourth wheel 41) and the bearing portion (for example, the through hole 63a) of the wheel train 29 ), And the train wheel bridge 29 is lowered with respect to the main plate 20. Then, the upper shaft portion of each wheel is pivotally supported by the bearing portion of the train wheel bridge 29 and the lower surface of the train wheel bridge 29 abuts against the upper surface of the main plate 20. Thereby, the train wheel assembly step is completed.

  Here, at the time of the train wheel assembly assembly process, the train wheel bracket 29 is lowered to a position where it abuts or approaches the fixed portion 73 of the pressing member 70 as in the illustrated example. Does not press the fixed portion 73 downward, so that no pressing force is applied to the pressing member 70. Therefore, the pressing member 70 is held at the natural length even after the train wheel assembly step.

FIG. 7 is a perspective view showing an assembly process of the movement 10 subsequent to FIG. In FIG. 7, the train wheel bridge 29 described above is omitted.
As shown in FIGS. 3 and 7, in the pressing force application step, the battery plus terminal 28 is assembled from above the train wheel bridge 29 in a state where the base plate 20 and the train wheel bridge 29 are assembled. At this time, in the battery plus terminal 28, the battery holder 29 and the battery plus terminal 28 are aligned with each other so that the pressing force applying portion 90 enters the notch 29a of the train wheel bridge 29. The positive terminal 28 is lowered. Then, the pressing force applying portion 90 of the battery plus terminal 28 enters the base plate 20 and the train wheel bridge 29 through the notch portion 29a, and then comes into contact with the base end portion of the fixed portion 73 from above. In this state, when the battery plus terminal 28 is pushed further downward, the base end portion of the fixed portion 73 is pushed downward.

  On the other hand, when the fixed portion 73 is pushed downward by the pressing force applying portion 90, the pressing member 70 rotates like a lever with the distal end portion (near the support hole 73a) of the fixed portion 73 as a fulcrum. . Then, the pressing portion 71 of the pressing member 70 contacts the lower end surface 62b of the fourth gear 62 from below and pushes up the fourth wheel 41 upward. After that, the upward movement of the fourth wheel 41 (axle 60) is restricted by the train wheel bridge 29 (tenon frame 63) or the like, so that the upward movement of the pressing portion 71 is restricted.

Furthermore, when the battery plus terminal 28 is pushed further downward, the base end portion of the fixed portion 73 is pushed to a position where it contacts the support base 81 of the main plate 20. As a result, the fixed portion 73 is sandwiched between the pressing force applying portion 90 and the support base 81 of the main plate 20. In this state, the fixed portion 73 is almost entirely in contact with the support base 81. Thereby, the dispersion | variation in the movement amount (rotation amount) of the press member 70 in a pressing force provision process can be suppressed, and an assembly | attachment precision can be improved. Furthermore, it is possible to suppress the deformation of the fixed part 73 by suppressing the local action of stress on the fixed part 73.
On the other hand, when the pressing member 70 is rotated around the tip end portion (near the support hole 73a) of the fixed portion 73 in a state where the upward movement of the pressing portion 71 is restricted, the flexible portion 72 is mainly elastically deformed. start. Thereby, the pressing portion 71 of the pressing member 70 can be biased toward the fourth gear 62.

  Thereafter, the battery plus terminal 28 is fastened to the main plate 20 and the train wheel bridge 29 together with the set screw 30 to complete the pressing force applying step. That is, in the pressing member 70, the base end portion of the fixed portion 73 is pressed toward the base plate 20 side (downward) by the pressing force applying portion 90, while the pressing portion 71 is urged upward. It is pressed against the lower end surface 62 b of the fourth gear 62.

  As described above, in this embodiment, the pressing portion 71 of the pressing member 70 presses the fourth gear 62, so that the sliding resistance corresponding to the pressing force of the pressing member 70 is applied to the fourth gear 62. . Accordingly, when the hand movement is stopped, the fourth wheel 41 can be prevented from rotating between backlashes set between the fourth gear 62 and the fifth upper pinion 40b due to inertia. As a result, it is possible to suppress wobbling, uneven hand movement, and the like.

In particular, in this embodiment, in a state where the axle 60 is assembled to the main plate 20 and the train wheel bridge 29, the pressing member 70 is pressed against the fourth gear 62 to apply a pressing force to the pressing member 70. 90.
According to this configuration, since the fourth wheel 41 can be suppressed from being pressed by the pressing member 70 before the axle 60 is assembled to the main plate 20 and the train wheel bridge 29, when assembling the main plate 20 and the train wheel bridge 29. It is possible to prevent the fourth wheel 41 from rattling. As a result, it is possible to improve the assembling property while reducing the thickness of the axle 60, for example, by shortening the shaft length.
In addition, in this embodiment, since the pressing force applying unit 90 is provided on the existing battery plus terminal 28, an increase in the number of parts can be suppressed.

In addition, since the pressing member 70 of the present embodiment presses the fourth gear 62 in the axial direction, it is possible to stably rotate the fourth wheel 41 by suppressing shaft shake of the axle 60 and the like. it can. In addition, in the present embodiment, the fourth wheel 41 is pushed upward by the pressing member 70, so that the fourth wheel 41 (axle 60) can be brought into contact with the train wheel bridge 29 (tenon frame 63). In this case, for example, wear and scraping can be suppressed as compared with a configuration in which the fourth wheel 41 is pushed downward (for example, a configuration in which the fourth pinion 61 and the second wheel 43 are in contact with each other).
Furthermore, the pressing force applying unit 90 can apply a stable pressing force to the fourth gear 62 by urging the pressing portion 71 of the pressing member 70 toward the fourth gear 62.

  And according to the timepiece 1 and the movement 10 including the train wheel mechanism 23 of the present embodiment, it is possible to provide a high-quality and thin timepiece 1 and the movement 10 in which hand movement unevenness is suppressed.

Second Embodiment
Next, a second embodiment of the present invention will be described. FIG. 8 is a partial cross-sectional view showing a movement 110 according to the second embodiment of the present invention. The hand movement unevenness suppressing mechanism 131 of the present embodiment is different from the first embodiment described above in that the pressing force applying unit 190 is formed on the back object holder 130. In the following description, detailed description of the same components as those in the first embodiment will be omitted, and only different portions will be described.
As shown in FIG. 8, in the movement 110 of the present embodiment, the hand movement unevenness suppressing mechanism 131 includes a pressing member 170, a support portion 180, and a pressing force applying portion 190.

The support portion 180 includes a support base 181 formed on the upper surface of the main plate 20, and guide pins 182 standing from the support base 181.
The support base 181 is a flat surface, and the train wheel bridge 29 approaches from above.
The guide pin 182 is disposed on the inner peripheral side on the support base 181, and the upper end portion thereof is accommodated in the accommodation hole 101 formed in the train wheel bridge 29.

The pressing member 170 has the same outer shape as the pressing member 70 of the first embodiment described above, and includes a pressing part 71, a flexible part 72, and a fixed part 173.
The fixed portion 173 has a support hole 173a penetrating in the thickness direction at the tip. The fixed portion 173 is sandwiched between the support base 181 and the train wheel bridge 29 in a state where the guide pin 182 is inserted into the support hole 173a.

  The pressing force application unit 190 is formed integrally with a flat plate-shaped back object holder 130 disposed between the main plate 20 and the dial plate 11. Specifically, the pressing force applying part 190 is formed in a bar shape extending upward from a portion of the back object holder 130 that overlaps the flexible part 72 in the axial direction, and is inserted into the insertion hole 102 formed in the base plate 20. Has been. The pressing force applying portion 190 is extended to a position where the upper end portion is close to the lower surface of the train wheel bridge 29 and pushes the flexible portion 72 upward. Thereby, the pressing member 70 is in a state where the fixed portion 173 (base end portion) is sandwiched between the main plate 20 and the train wheel bridge 29 and the pressing portion 71 (tip end portion) is biased upward. The lower end surface 62b of the fourth gear 62 is slidably pressed. That is, in the pressing member 170 of this embodiment, the fixed portion 173 functions as a fulcrum and the flexible portion 72 functions as a power point. The back object holder 130 is fixed to the main plate 20 by a set screw 132.

[Movement assembly process]
Next, an assembly process of the above-described movement 110 will be described. FIG. 9 is a partial cross-sectional view showing an assembly process of the movement 110. In the following description, the pressing force applying process for assembling the back object holder 130 will be mainly described.

  As shown in FIG. 9, the pressing force application process of the present embodiment performs the same wheel train assembly process as that of the first embodiment described above, and then the battery plus terminal 28 is connected to the main plate 20 and the set screw 30 with the set screw 30. It is performed after being fastened together with the train wheel bridge 29. Therefore, before the pressing force application step, the pressing member 170 is held in a natural length state between the main plate 20 and the train wheel bridge 29. Specifically, of the pressing member 170, the pressing portion 71 approaches or abuts the lower end surface 62 b of the fourth gear 62 from below. On the other hand, the fixed portion 173 has a guide pin 182 inserted through the support hole 173a and is sandwiched between the main plate 20 and the train wheel bridge 29 and is restricted from moving in the axial direction.

  Then, as shown in FIG. 8, in the pressing force application step, the back object holder 130 is assembled from below the main plate 20. At this time, among the back object holders 130, the back object holders 130 are raised in a state in which the base plate 20 and the back object holders 130 are aligned so that the pressing force applying portion 190 enters the insertion hole 102 of the base plate 20. Let Then, the pressing force applying part 190 of the back object holder 130 enters the base plate 20 and the train wheel bridge 29 through the insertion hole 102, and then comes into contact with the flexible part 72 from below. In this state, when the back object presser 130 is further raised, the flexible portion 72 is pushed upward.

  On the other hand, when the flexible portion 72 is pushed upward, the pressing member 170 rotates about the fixed portion 173 as a fulcrum. Then, the pressing portion 71 of the pressing member 170 abuts the lower end surface 62b of the fourth gear 62 from below and pushes up the fourth wheel 41 upward. Thereafter, the upward movement of the fourth wheel 41 is restricted, so that the upward movement of the pressing portion 71 is restricted.

  Further, when the back object presser 130 is further raised in a state where the upward movement of the pressing portion 71 is restricted, the flexible portion 72 mainly starts to elastically deform. Thereby, the pressing portion 71 of the pressing member 70 can be biased toward the fourth gear 62. When the back object holder 130 comes into contact with the main plate 20, the back object holder 130 is fixed to the main plate 20 with a set screw 132. Thus, the pressing force application process is completed. That is, among the pressing members 170, the flexible portion 72 is pressed toward the train wheel bridge 29 side (upward) by the pressing force applying portion 190, while the pressing portion 71 is urged upward in the fourth state. It is pressed against the lower end surface 62 b of the gear 62.

According to the present embodiment, in addition to the same effects as those of the first embodiment described above, the pressing force applying unit 190 is provided on the existing back object holder 130, so that an increase in the number of parts can be suppressed. .
Furthermore, since the pressing force application process can be performed after the main plate 20 and the train wheel bridge 29 are fixed by the set screw 30, it is possible to reliably prevent the fourth wheel 41 from rattling in the pressing force application process. As a result, the assembly property can be further improved.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. The hand movement unevenness suppressing mechanism 231 of the present embodiment is different from the above-described embodiment in that the pressing force applying part 290 is formed on the base plate 20. In the following description, detailed description of the same components as those in the first and second embodiments will be omitted, and only different portions will be described. FIG. 10 is a cross-sectional view showing a movement 210 according to the third embodiment. FIG. 11 is a perspective view of the movement 210 as viewed from the front side.

As shown in FIGS. 10 and 11, in the movement 210 of the present embodiment, the support portion 280 of the hand movement unevenness suppressing mechanism 231 includes a support base 81, a guide pin 282 erected from the support base 81, and a support base 81. And a pressing force imparting portion 290 formed on the outer peripheral side.
The pressing force application part 290 has a stepped shape continuously provided from the outer peripheral end of the support base 81. Specifically, the pressing force application unit 290 includes a rising portion 290a that rises upward, and an upper step portion 290b that extends from the upper edge of the rising portion 290a toward the outer peripheral side in one direction C.

The pressing member 270 includes a pressing portion 71, a flexible portion 72, and a fixed portion 273, and is assembled between the main plate 20 and the train wheel bridge 29 so as to be slidable along one direction C.
A locking claw 273 a that protrudes toward the outer peripheral side along one direction C is formed at the base end portion of the fixed portion 273. The locking claw 273a is locked to the above-described rising portion 290a. As a result, the fixed portion 273 is supported on the support base 81 in an inclined state upward from the outer peripheral side along the one direction C toward the inner peripheral side (the fourth wheel 41 side). Note that, in the train wheel bridge 29 according to the present embodiment, a notch 201 (see FIG. 10) that exposes the base end portion of the fixed portion 273 upward is formed.

  Further, a support hole 273b through which the guide pin 282 is inserted is formed at the distal end portion of the fixed portion 273. The support hole 273b is a long hole having one direction C as a major axis direction, and allows sliding movement along the one direction C of the pressing member 270 with respect to the guide pin 282. In the state where the locking claw 273a is locked to the rising portion 290a, the guide pin 282 is located on the outer peripheral side of the support hole 273b, and the movement of the pressing member 270 toward the inner peripheral side along the one direction C is not performed. Regulated (locking position).

[Movement assembly process]
Next, an assembly process of the above-described movement 210 will be described. FIG. 12 is a cross-sectional view showing the assembly process of the movement 210. FIG. 13 is a perspective view showing an assembly process of the movement 210. In the following description, a pressing force applying process for applying an urging force to the pressing member 270 will be mainly described.

  The pressing force application process of this embodiment is performed after the battery plus terminal 28 is fastened to the main plate 20 and the train wheel bridge 29 with the set screw 30 in the same manner as the second embodiment described above. Therefore, before the pressing force application step, the pressing member 270 is held in a natural length state between the main plate 20 and the train wheel bridge 29 as shown in FIGS. Specifically, in the fourth gear pressing spring 270, the pressing portion 71 is close to or abuts the lower end surface 62 b from below on the outer peripheral side of the fourth gear 62. On the other hand, the fixed portion 273 has a distal end portion sandwiched between the support base 281 and the train wheel bridge 29, and a proximal end portion supported on the upper step portion 290b of the pressing force applying portion 290, and a locking claw 273a. And the rising portion 290a are unlocked (unlocking position). In the state where the locking claw 273a and the rising portion 290a are unlocked, the guide pin 282 is located on the inner peripheral side of the support hole 273b, and toward the outer peripheral side along the one direction C of the pressing member 270. Movement is restricted.

  In the pressing force application step, the pressing member 270 is slid from the locking release position toward the locking position (arrow P in FIG. 13). Specifically, after pushing the base end portion of the fixed portion 273 toward the inner peripheral side along one direction C through the notch portion 201 of the train wheel bridge 29, the base end portion of the fixed portion 273 is further moved. Push down. When the fixed portion 273 is pushed downward, the pressing member 270 rotates like a lever with the distal end portion of the fixed portion 273 (near the support hole 273b) as a fulcrum. Thereby, the pressing part 71 of the pressing member 70 can be urged | biased toward the 4th gearwheel 62 similarly to 1st Embodiment mentioned above.

  In this state, the pressing member 270 is held at the locking position by locking the locking claw 273a of the fixed portion 273 with the rising portion 290a. Thus, the pressing force application process is completed.

Thus, in this embodiment, while exhibiting the effect similar to embodiment mentioned above, the increase in a number of parts can be suppressed by providing the base plate 20 with the pressing force provision part 290. FIG.
Furthermore, since the pressing force application process can be performed after the main plate 20 and the train wheel bridge 29 are fixed by the set screw 30, it is possible to reliably prevent the fourth wheel 41 from rattling in the pressing force application process. As a result, the assembly property can be further improved.

In order to securely lock the locking claw 273a and the rising portion 290a, an angle that forms a collar portion that covers the locking claw 273a from the upper side on the rising portion 290a, or an angle between the rising portion 290a and the support base 81 is formed. It is also possible to form an acute angle.
In one direction C, the length of the support hole 273b is preferably shorter than the length of the portion of the fixed portion 273 that is supported on the upper step portion 290b at the unlocking position. This also ensures that the locking claw 273a and the rising portion 290a can be locked in the pressing force application step.

As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included. For example, in the above-described embodiment, the case where the present invention is applied to the fourth wheel & pinion 41 to which the second hand 14 is attached has been described, but the present invention is not limited thereto. For example, the present invention may be applied to the third wheel 42 and the fifth wheel 40 that mesh with the fourth wheel 41.
When applied to the fifth wheel & pinion 40, one is that the rotational speed of the fourth wheel & pinion 41 is also suppressed by suppressing the rotational torque from the rotor, so that the rotation angle due to inertia is also reduced. The second is the inertia of the fourth wheel 41 after the hand movement is clogged with the backlash with the fifth wheel 40, and the force to rotate the fifth wheel 40 works, but the rotation is suppressed by the urging force of the pressing member. Overrun of the number wheel 41 is also suppressed.
Further, when applied to the third wheel 42, the third wheel 42 rotates due to the inertia of the fourth wheel 41 after the hand movement, but this rotation is suppressed by the urging force of the pressing member. Suppresses overruns. As a result, it is possible to suppress uneven movement of the hands. In addition, the present invention can be applied to various gears such as a gear to which a chronograph second is attached.
Further, in each of the above-described embodiments, the case where the present invention is applied to an analog quartz type timepiece has been described. However, the present invention is not limited to this, and the present invention may be applied to a mechanical type timepiece.

In the above-described embodiment, the configuration has been described in which the lower end surface 62b of the fourth wheel & pinion 41 is a flat portion and the flat portion is pressed in the axial direction. However, the configuration is not limited thereto, and the radial direction orthogonal to the axial direction is directed. The configuration may be such that the flat portion of the fourth wheel 41 is pressed.
Further, in the above-described third embodiment, the configuration in which the pressing member 270 is slid along the one direction C has been described. However, the pressing member 270 may be configured to rotate in an in-plane direction orthogonal to the axial direction.

  Further, for example, in the above-described embodiment, the configuration in which the pressing member is formed with the flexible portion and the pressing member is positively elastically deformed has been described. If there is, the design of the shape of the pressing member can be changed as appropriate.

  Furthermore, in the above-described embodiment, the case where the pressing force applying portion is provided on the existing members such as the battery plus terminal 28, the back object holder 130, and the base plate 20 has been described. A pressure applying unit may be provided, or a pressing force applying unit may be provided as a separate component from the existing member.

  In addition, in the range which does not deviate from the meaning of this invention, it is possible to replace suitably the component in the embodiment mentioned above by the known component, and you may combine each modification mentioned above suitably.

DESCRIPTION OF SYMBOLS 1 ... Clock 10, 110, 210 ... Movement 20 ... Base plate (mounting part)
23 ... Wheel train mechanism 28 ... Battery plus terminal 29 ... Wheel train bracket (mounting part)
41. Fourth wheel (gear)
60 ... Axle 62b ... Lower end surface (flat portion)
70, 170, 270 ... pressing member 90, 190, 290 ... pressing force applying portion O ... axial center

Claims (8)

A gear that is rotatably supported at both ends of the axle with respect to the mounting portion;
A pressing member held by the mounting portion so as to be able to press the flat portion of the gear;
A pressing force applying portion that presses the pressing member toward the flat surface portion of the gear and applies a pressing force to the pressing member in a state where the gear is assembled to the mounting portion ;
The pressing force applying part is provided on an existing part arranged outside the mounting part or a part different from the existing part, and presses the pressing member through the mounting part. Column mechanism. The pressing member is elastically deformable,
The train wheel mechanism according to claim 1, wherein the pressing force applying unit biases the pressing member toward the gear.   The train wheel mechanism according to claim 1 or 2, wherein the pressing member presses the gear toward a direction along an axis. The train wheel mechanism according to any one of claims 1 to 3, wherein the pressing force applying portion is provided on a battery plus terminal . The train wheel mechanism according to any one of claims 1 to 3, wherein the pressing force applying portion is provided on a back object presser . A gear that is rotatably supported at both ends of the axle with respect to the mounting portion;
A pressing member held by the mounting portion so as to be able to press the flat portion of the gear;
A pressing force applying portion that presses the pressing member toward the flat surface portion of the gear and applies a pressing force to the pressing member in a state where the gear is assembled to the mounting portion;
The train wheel mechanism is characterized in that the pressing force application part is formed in the attachment part, and the pressing member can be locked . The train wheel mechanism according to any one of claims 1 to 6,
And a power source for applying a rotational force to the train wheel mechanism.   A timepiece comprising the movement according to claim 7.

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