JPH0827360B2 - Wheels of pointer-type mobile watches - Google Patents

Description

TECHNICAL FIELD The present invention relates to a wheel train structure of a pointer type portable timepiece.

[Prior Art] In the conventional wheel train structure of a hand-held hand-held timepiece, a sliding mechanism is provided at any part of the train wheel train to correct the hand position at the time of so-called hand adjustment for adjusting the hand position at the current time. In particular, in the case of a pointer-type portable timepiece having a second hand, it is necessary to correct the hour and minute hands while fixing the second hand when correcting, and the minute wheel is fixed to correct the hour and minute hands by absorbing the external force from the external operating member. The slippery spring was used for the.

In addition, a measure of electronic correction using a device on the circuit is also taken, but in this case, since correction with a second hand consumes a large amount of energy and takes a long time to correct,
It is limited to correcting the minute hand.

[Problems to be Solved by the Invention] However, the train wheel structure having a sliding mechanism has the following problems.

1. A spring member is required to adjust the sliding torque, increasing the number of parts.

2. The strength of the gear wheel, especially the gear wheel, is required against the sliding torque load, which reduces the degree of freedom of the material. Cost reduction methods such as kana using a plastic material and integral molding of the watch wheel will not be possible.

Therefore, the present invention is intended to solve such a problem and to provide a structure for needle matching without using a sliding mechanism. More specifically, it will provide a more practical structure of the hand correction mechanism that corrects the seconds by cutting off part of the meshing of the minute and second wheels for fixing the minute and second hands of the above-mentioned wheel train. It is what

[Means for Solving the Problems] In the pointer type portable timepiece of the present invention, the gear portion and the pinion portion of a plastic watch wheel having at least a gear portion and a pinion portion having an outer diameter smaller than that of the gear portion are other parts. In a train wheel of a pointer type portable timepiece that constitutes a mesh train wheel and a plastic train wheel, one of the train wheels is pivotally supported by a bearing provided on one of the train wheels, The other is pivotally supported in a hole provided in a plastic support member that is movable in conjunction with an external operation member, and the support member moves when the support member moves in response to the operation of the external operation member. The pinion portion of the wheel & pinion pivotally supported by is disengaged from the other wheel and the gear portion is kept in mesh with the other wheel.

[Operation] According to the above configuration of the present invention, the movable wheel & pinion has a pinion portion and a gear portion, and each meshes with another wheel & pinion to form a wheel train. Further, the movable wheel & pinion is pivotally supported at two upper and lower positions, and one of them is pivotally supported by a movable member that interlocks with an external operation member. When the movable member is moved during the hand correction (time correction), the pivotally supported portion moves to cut off a part of meshing of the train wheel train. At this time, only the meshing of the pinion portion of the center wheel, which is pivotally supported by the movable member, is displaced so that the gear portion is meshed.

[Embodiment] FIG. 1 is a schematic plan view showing an embodiment of the present invention. 1
Is an external operating member, and 2 is a movable member which is interlocked with the operation of the external operating member via the engaging portion 2a. Reference numeral 2b is a click portion that improves the operation feeling, and also regulates the movement direction and position of the movable member.
The third wheel & pinion 3 is pivotally supported on one side by the movable member. The third wheel and pinion wheel 4 to which the second hand is fixed and the second wheel & pinion 5 to which the minute hand is fixed form a mesh wheel train. An intermediate wheel 6 is engaged with the external operation member when the external operation member 1 is in the hand correction state to correct the minute hand and the hour hand.

FIG. 2 is a sectional view of the train wheel train section in FIG. In the third wheel & pinion 3, the gear portion 3a and the pinion portion 3b are engaged with the pinion portion 4a of the fourth wheel and the gear portion 5a of the second wheel, respectively, to form a train wheel train. It is well known that the reduction ratio from the fourth wheel to the second wheel is 1/60.

FIG. 3 is a cross-sectional view showing the state of the third wheel & pinion when the external operating member is operated to be in the second correction state. At this time, it is important to disengage only the pinion 3b of the third wheel and pinion. This is necessary to prevent the occurrence of needle jump due to the meshing of gears interfering with each other in the process in which the third wheel is meshed again after the needle correction. Third wheel Kana 3b and second wheel Gear 5a
By disengaging only the mesh of, the needle jumper of the fourth wheel does not occur. Further, the needle jump of the minute hand caused by the circumferential pitch deviation between the third pinion portion and the second gear is large in the outer periphery of the second gear, and can therefore be held within a small range. This is the third wheel 3a
It is clear if it is compared with the needle jumper when the engagement between and the fourth pinion 4a is disengaged. To complete this structure, the position m / l of the third wheel and third kana should be as large as possible and at least 2
Double is needed.

EFFECTS OF THE INVENTION The present invention provides a plastic wheel and pinion having at least a gear portion and a pinion portion having an outer diameter smaller than that of the gear portion. In a train wheel of a pointer type portable timepiece that constitutes a train, one of the watch wheels is rotatably supported by a bearing provided on a plastic fixed member, and the other is movable in conjunction with an external operation member. A pin portion of a wheel & pinion pivotally supported by a hole provided in a plastic support member that is possible, and when the support member moves in response to an operation of the external operation member, Releases the meshing with the other wheel and the gear part holds the meshing with the other wheel, so needle correction can be performed with almost no load. Peripheral members are inexpensive because they require almost no strength In which the available plastics materials.

Furthermore, since the correction mechanism can be easily assembled simply by inserting the watch wheel into the hole of the indicating member, the number of assembly steps can be reduced and complicated parts processing is not required, so that the parts can be easily processed. It can be done.

[Brief description of drawings]

 FIG. 1 is a schematic plan view showing an embodiment of the present invention. FIG. 2 is a sectional view of a main part in FIG. FIG. 3 is a cross-sectional view of a main portion in a needle correction state.

Claims (1)

[Claims] 1. A gear wheel and a pinion portion of a plastic dial wheel having at least a gear portion and a pinion portion having an outer diameter smaller than that of the gear portion, and the gear portion and the pinion portion form a mesh train wheel train with another plastic dial wheel. In the wheel train of the pointer type portable timepiece, one of the watch wheels has one of which is pivotally supported by a bearing provided on a plastic fixing member and the other of which is movable in conjunction with an external operating member. When the support member is moved in response to the operation of the external operating member, the pinion portion of the wheel & pinion supported by the support member has a different number. A wheel train for a hand-held hand-held watch characterized by releasing the mesh with the car and retaining the mesh with the other wheel.