JPS6225726Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hand rotation device for a watch.

Conventionally, knobs for adjusting pointers such as the minute hand are directly fixed to a shaft that protrudes from the watch body, and protrudes outward from the rear frame. With the recent demand for common parts, the same mechanical body is sometimes attached to various frames and used as watches of various designs. At this time, if used for a frame with a large depth, the length that the knob protrudes from the frame will be small, and if the frame is small in depth, the length that the knob will protrude will be large, so that the length of the knob that protrudes is constant. I couldn't change it. In order to prevent this, it was necessary to prepare a wide variety of products by changing the lengths of the knobs and shafts, which led to an increase in the number of parts and went against the demand for common parts. In addition, to prevent the shaft protruding from the watch body from constantly rotating, a connecting mechanism is provided inside the watch body, but in order to avoid complicating the mechanical body, the connecting mechanism must be built in, otherwise the shaft would protrude outside. The knobs on the handle rotated in conjunction with the shaft all the time, which was not desirable from the standpoint of both the load and the manual handling. Furthermore, in order to prevent contact between the rear frame and the knob, the diameter of the hole through which the knob protrudes was made large, which not only allows dust to get in, but also causes many other inconveniences, such as strength problems when the shaft is long. It was hot.

This invention solves the above problems, and increases versatility by allowing the same machine body to be applied to frame bodies of different depths, and also enables the machine body to be simplified even when the mechanism is not equipped with a connecting mechanism. To provide a pointer rotating device in which a protruding knob does not rotate.

Embodiments of the present invention will be described below based on the drawings.

In Figures 1 and 2, the mechanical body 1 does not have a built-in connecting mechanism, and for this reason, the shaft 2 for adjusting the pointer, which is constantly rotating, is oriented toward the rear frame 3 of the frame body. It stands out. The shaft 2 is a spline shaft having parallel key-shaped teeth 2a of equal pitch formed on its outer circumference.

The knob 4 is directly rotatably and slidably inserted into the hole 5 of the rear frame 3, and has a sufficiently long hollow part 4a in the longitudinal direction formed in the center facing the shaft 2. Several rows of vertical grooves 6 that can mesh with the teeth 2a of the shaft 2 are formed on the inner circumferential surface. A claw part 7 is formed on the outer periphery of the tip of the knob 4 located inside the frame body to prevent it from coming off from the frame body, and a claw part 7 is formed between the claw parts from the center to the outer periphery. A split groove 8 towards the direction and from the weak end to near the center in the longitudinal direction.
...is being drilled. The central shaft portion 9 extending in the longitudinal direction from the claw portions 7 has a shaft diameter that can be inserted into the hole 5, and is made to protrude outward from the rear frame 3 and has a length corresponding to a desired sliding distance. The collar portion 10 is provided to protrude. The rear end portion of the knob 4 protrudes further rearward than the collar portion 10 to form a grip portion 11 . A coil spring 12, which is an elastic body, is loosely fitted into the central shaft portion 9 and is interposed between the collar portion 10 and the rear frame 3 to constantly press the knob 4 rearward. Around the hole 5 of the rear frame 3, a cylindrical part 13 having an inner diameter substantially the same as the outer periphery of the collar part 11 is provided to protrude rearward to protect the outer periphery of the coil spring 12.

Next, the effect will be explained.

The machine body 1 is fixed to a front frame (not shown),
The shaft 2 protrudes toward the rear frame 3. Central shaft part 9
After inserting the coil spring 12 into the hole 5 of the rear frame, place the tip end facing the hole 5 of the rear frame and push it into the hole 5.
The tip part is distorted inward from the center by the split groove 8..., and the claw part 7... penetrates the hole 5 and engages with the inner side around the hole of the rear frame 3, and the coil spring 12 is connected to the rear frame 3 and the collar part. 10 to press the knob 4 backward at all times. Then, the front frame and the rear frame 3 may be engaged with each other. In this case, shaft 2 is inside the frame.
and knob 4 are always separated.

When adjusting the pointer, use the coil spring 12.
When the knob gripping portion 11 is pressed in the axial direction against the repulsive force of Therefore, the knob and the shaft are connected, and the tip of the knob can no longer bend, so the knob will not fall off. In this state, knob 4
You can modify the guideline by turning the . The depth at which the shaft 2 fits into the hollow portion 4a corresponds to the depth of the frame. That is, when the depth of the frame is large, the fitting depth becomes small, and when the depth is small, the fitting depth becomes large. In any case, it is sufficient that the fitting is deep enough to transmit the rotation of the knob.

The third figure shows an example in which a connecting mechanism is built into the machine body, and in this case, when connecting the shaft and the knob, it is necessary to press the shaft to connect the connecting mechanism. For this reason, in this example, the stepped pointer adjustment shaft 1
02 is used. As a result, the knob 4 is pressed and the teeth 102a of the shaft 102 are inserted into the longitudinal grooves 6 of the hollow portion 4a...
After being fitted into the inside, the tip of the knob comes into contact with the stepped portion 102b of the shaft 102, and the shaft 102 is pushed in through this to connect the connecting mechanism. After that, rotate the knob 4 to correct the pointer. Note that the shaft is not limited to being stepped, and the hollow portion may be stepped and the stepped portion may be brought into contact with the tip end surface of the shaft. Further, in this example, since the shaft is always stationary, when the front frame and the rear frame are assembled, the tip of the shaft may be slightly fitted into the hollow part of the knob.

Further, the teeth 2a, 102a of the shaft may be formed of serrations, in which case a vertical groove that can be fitted into the hollow portion is formed in the hollow portion. In addition, both may be formed in a non-circular shape so that the shaft is linked to the rotation of the knob.

As explained above, according to the present invention, the knob is rotatably and slidably fitted into the frame, and the knob is always elastically pressed backwards, so the knob can be moved back and forth as necessary to allow the shaft to move freely. It is possible to connect with the machine body or to connect with the connecting mechanism built into the machine body. For this reason, it can be used in machines with a built-in connecting mechanism, and since the knob can be kept stationary at all times by separating it from the shaft, it can be used in machines with a simple structure that does not use a connecting mechanism. It is versatile because it can be used with a frame body, and it can also accommodate differences in the depth of the frame body. In addition, the length of the knob that protrudes to the outside can be made constant, and the dustproof effect is also great.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a sectional view of the main part, FIG. 2 is an enlarged sectional view taken along the line of FIG. 1, and FIG. 3 is a sectional view of the main part of another example. 1... Mechanical body, 2,102... Axis, 2a, 10
2a... Teeth of shaft, 3... Frame, 4... Knob, 4
a...Hollow part, 6...Vertical groove, 9...Central shaft part, 1
0...Brim part, 12...Coil spring.

Claims (1)

[Scope of Claim for Utility Model Registration] A shaft for rotating the pointer that protrudes from the machine body and has a non-circular tip, and a shaft that is rotatably and slidably inserted into the frame, with a longitudinal hollow in the center. The inner peripheral surface of the hollow part is formed into a non-circular shape that can be fitted with the tip of the shaft, and the central shaft protruding outward from the frame has a collar. , an elastic body loosely fitted into the central shaft part and interposed between the collar part and the frame body, and by pressing the knob, the tip of the shaft is applied to the inner circumferential surface of the hollow part. A pointer rotation device that adjusts the pointer by fitting the two together and rotating a knob.