JPH0326474Y2 - - Google Patents

Description

[Detailed description of the invention] The invention relates to the structure of a movement of a pointer type watch. The purpose is to make the movement thinner and the structure simpler. First, a conventional example of the present invention will be explained. In the first conventional example, in the movement of the embodiment of the present invention (Fig. 1), which will be described later, the middle plate 4 is replaced with a commonly used thick and rigid metal plate, and the main plate 1 and the hour hand wheel It has a structure in which a thin plate-shaped ring spring called a dial washer is inserted into the gap between the dial washer and the needle washer to generate frictional torque that resists the movement of the hands. This prevents the hands from rattling due to the collision between the gear and the pinion, and maintains the parallelism between the hands and the dial surface. However, this structure requires two parts: the middle plate and the dial washer (the middle plate, which is a rigid body, serves as a bearing on the back side of the minute hand shaft, and also to prevent the thrust force of the dial washer from acting on the second hand shaft. However, there is a problem in that the structure is complicated and thick. The second conventional example is Utility Application No. 51-119323
No. 37563) As shown in Fig. 1, a leaf spring 9 is sandwiched between the minute hand wheel 8 and the second hand shaft 3 to press the minute hand wheel 8 toward the receiving plate 10, which also provides the frictional torque necessary for stable hand movement. be. This configuration is still a rigid receiving plate 10.
There is a problem that the thickness increases due to the presence of the minute hand shaft, and there is a problem that the minute hand shaft tends to tilt because there is no bearing fixed to the back side of the minute hand shaft. Frictional torque of the same order as the torque also acts on the second hand shaft. The torque that can be output from the second hand shaft is approximately 1/60 that of the minute hand shaft.
However, if you apply even the slightest amount of friction torque, there is an increased risk that the watch will stop immediately. On the other hand, if the friction torque is lowered to a safe level, the bump-crash suppressing effect tends to be insufficient, especially for the minute hand. Therefore, this structure makes it extremely difficult or impossible to manage frictional torque. The present invention focuses on these points, and aims to provide a movement structure that can provide an appropriate amount of frictional force to the minute hand shaft and hour hand shaft, and that can be simplified and thinned while reliably bearing the minute hand shaft. It is said that The present invention will be explained using drawings. FIG. 1 is a sectional view according to the present invention. 1 is the main plate, 2 is the hour hand wheel, and 3 is the minute hand gear. 4 is the middle plate. The dotted line shows the free state, and the solid line shows the built-in state. Reference numeral 5 denotes a spindle hole in the middle plate 4, which fits into the shaft portion 7 of the minute hand shaft 6 on the side opposite to the pointer. Minute hand axis 6
is rotatably supported by the main plate 1 and the middle plate 4 via the hour wheel 2. 8 shows the deformation of the intermediate plate 4 between the free state and the installed state. This deformation 8 is due to elasticity, and the stress accompanying the deformation is caused by the arrow 9 indicating the minute hand axis 6.
That is, it is pressed in the direction of the pointer (not shown). The force of arrow 9 is transmitted to arrow 10 and minute hand axis 6
The hour wheel 2 is supported by being lightly pressed by the middle plate 4 and the main plate 1. Light pressure results in light frictional torque. This friction torque prevents rattling caused by backlash between the tooth profiles 11 and 11' and other meshing pins (not shown). Furthermore, the parallelism of the pointer is stabilized. The middle plate 4 is made of a thin metal plate with spring properties, and does not need to be thick and allows the movement to be made thinner. Pressed products are generally cheaper than molded products. A second hand wheel 12 passes through a pipe-shaped hole in the minute hand shaft 6. 13 is a second presser spring. 14 is a receiving plate, and the base plate 1 is a fitting part 1.
Combined with 5. The end portion 16 of the middle plate 4 is the receiving plate 1
4 and deforms downward. The solid line diagram of the middle plate 4 becomes convex and produces a deformation 8. Reference numeral 17 denotes an end hole of the intermediate plate 4, which is fitted into a boss 18 of the base plate 1 to determine the surface coordinates of the intermediate plate 4. FIG. 2 is a plan view of the intermediate plate 4 according to the present invention. 5 is a hole in which the shaft portion 7 is supported.
17 is the end hole mentioned above. Three end holes 17 are provided at equal angular intervals. The end hole 17 has a further improved elongated hole shape, and the small diameter portion fits into the boss 18 without play. There is sufficient space between the large diameter portion and the boss 18. This margin allows free movement of the end hole 17 in the radial direction with respect to the boss 18 due to the deformation 8 described above.
However, this movement is the same amount at three locations at the same time, so hole 5
The position of remains unchanged. Therefore, the minute hand shaft 6 in FIG. 1 is correctly supported without passing through it. End hole 17
It is sufficient that the number of is three or more. Alternatively, a parallel lead may be used instead of a hole, and this may be guided by the base plate 1 or the receiving plate 14 so as to be movable in the radial direction. In the case of an alarm clock, a separate guide wheel may be provided. Furthermore, the hour wheel 2 may be located outside the main plate 1, and the middle plate 4 may pressly support only the minute hand shaft 6.

According to this invention, by integrating the middle plate (or receiving plate) and the hand seat (plate spring), the structure of the movement can be simplified and thinned while reliably bearing the rear end of the minute hand shaft, and the manufacturing cost can be reduced. Moreover, since large frictional torque does not reach the second hand shaft, an excellent effect is produced in that the output torque of the pointer is kept sufficiently large.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a timepiece movement which is an embodiment of the present invention, and FIG. 2 is a plan view of a middle plate 4 used in the same embodiment. 4... Middle plate, 6... Minute hand shaft.

Claims (1)

[Scope of utility model registration request] It has an intermediate plate consisting of a spindle hole and a plurality of end engaging portions provided around the spindle, and the entire plate is made of a thin plate with spring properties, and the spindle hole of the middle plate is located opposite to the minute hand axis. The end engaging portions are loosely engaged with the side shaft portions, and each of the end engaging portions engages with a portion of the base plate or the receiving plate to position the spindle hole and to determine the cross-sectional position of the spindle hole. , If the minute wheel is not present, the spindle hole is assembled so that it is slightly closer to the pointer than it would be if the minute wheel is supported on a bearing, so that the spindle hole is positioned slightly closer to the pointer than the minute hand shaft. A pointer-type watch movement that is characterized by generating pressure in a certain direction.