JPH0710310Y2 - Pointer-type clock display structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an improvement in the structure of the display portion of a pointer type timepiece.

[Conventional technology]

The hour hand is not a rod shape but a disk shape so that the image of the hour hand (needle shape or a mark that serves as an arbitrary index or conversely a number representing "hour" corresponding to a fixed mark) is printed or plated. The dial, which is the background of the hour and minute hands, is omitted (fixed numbers and indicators of the other hand for the hour hand image are printed on the underside of the windshield, for example). The watch is made thinner by the thickness of the dial. Has already been proposed. (For example, Japanese Patent Application Sho 61
-189195 etc.) [Problems to be solved by the invention] However, since the disc-shaped hour hand plate was press-fitted into the shaft of the hour hand wheel (the hour wheel) like the conventionally known ordinary bar-shaped hour hand, cleaning of the timepiece etc. It was not easy to remove the pointer. That is, when a jig is applied to the outer circumference of the hour hand plate to remove it, the hour hand plate is likely to be deformed. Therefore, in the above-mentioned conventional example, it is proposed to insert a flat plate with a slit behind the hour hand plate and lift it to remove it, but prepare a special jig that is not necessary for a very ordinary watch. I have to
Also, since the flat plate is inevitably thin, the hour hand plate may be deformed depending on how it is handled, and quick work cannot be performed.

[Means for solving problems]

In the present invention, the hour hand plate and the hour hand shaft are loosely engaged with each other, and a step portion for pressing the outer peripheral portion of the hour hand plate is provided in the case.

[Action]

When the movement is stored in the case, the step of the case prevents the hour hand plate from coming off from the hour hand shaft. When the movement is removed from the case, since the hour hand plate is loosely engaged with the hour hand shaft, it can be easily removed with a small force without fear of deformation. For example, it is easy to arrange the disk to drop when the display surface faces downward.

〔Example〕

FIG. 1 is a sectional view of a timepiece according to an embodiment of the present invention. 1 is a movement of an analog timepiece, 2 is a central axis fixed to the movement, 3 is a minute hand wheel fitted to the central axis,
The minute hand 5 is press-fitted and fixed to the shaft portion. Reference numeral 4 is an hour hand wheel (cylinder wheel), and an hour hand plate 6 (a circular plate made of a metal plate, a plastic plate or a film, on which an hour hand image 6a is printed) is fitted on the shaft portion thereof. Reference numeral 4a denotes a protrusion on the hour hand wheel 4 which has an anti-rotation function at the hour hand plate engaging portion,
On the other hand, the hour hand plate 6 is loosely fitted. The degree of fitting is such that, when the display surface faces downward, the hour hand plate 6 is
It should either fall naturally or be easily removable by grasping the outer circumference of the hour hand plate with a light force.

Reference numeral 7 is a case body, and 8 is a windshield (not shown), but a scale or a number indicating the time is printed on the lower surface (inner surface) thereof.
Reference numeral 9 is a ring-shaped packing for press-fitting the windshield into the case, and 10 is a back lid. Reference numeral 11 denotes an hour hand plate pressing portion, which prevents the hour hand plate 6 from falling out of the movement 1 fixed in the case, and causes the hour hand plate 6 to face downward so that the hour hand plate 6 moves downward.
Even when the hour hand plate 6 moves in the direction of, the hour hand plate 6 is at a height position where a necessary clearance can be secured without touching the minute hand 5.
Is a stepped portion that presses the outer peripheral portion of. However, rather than pressing firmly, a slight clearance is provided as shown. Further, the height of the step is set so that the hour hand plate 6 does not come into contact with the minute hand 5 even if it hits the hour hand plate pressing portion 11.

When the completed timepiece is turned down, the hour hand plate 6 falls and comes into contact with the time plate holding portion 11, but since the load is about the friction torque due to the own weight of the hour hand plate 6, the hour hand shaft is sufficiently decelerated from the motor. Since it is there, it does not matter much. Further, since the speed reduction ratio of the minute hand shaft is only 1/12 of the hour hand shaft and the output torque is small, if the minute hand 5 and the hour hand plate 6 which are greatly different in rotation speed come into contact with each other, the minute hand shaft will stop due to friction due to "sliding". The risk increases. However, since the hour hand plate pressing portion 11 is set at the sectional height position for preventing the hour hand plate 6 and the minute hand 5 from contacting each other, the minute hand is always guaranteed to be freely rotated. A module pressing portion 12 positions the movement 1 with respect to the case 7 by abutting the outer peripheral portion thereof, and is provided below the hour hand plate pressing portion 11 and has a larger diameter. Further, as a modified example of the embodiment not shown, the structure of the rotation preventing portion is not limited to the pin type, but may be a non-circular shaft or hole such as a D shape, or a middle frame may be used between the movement and the case. . These and other variations are conceivable in various combinations with known structures.

[Effect of device]

According to the present invention, a special jig is not required for removing the hour hand plate, deformation of the hour hand plate can be prevented, and an extremely thin timepiece that does not cause "slip" between the hour hand plate and the minute hand can be obtained. .

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention. 1 ... Movement, 3 ... Minute hand wheel, 4 ... Hour wheel, 4a
...... Hour hand plate engaging part, 5 ...... minute hand, 6 ...... hour hand plate, 7 ......
Case body, 8 ... windshield, 11 ... hour hand plate retainer, 12 ... module retainer.

Claims (1)

[Scope of utility model registration request] 1. A timepiece having a minute hand fitted to the tip of a minute hand shaft and an hour hand printed on the hour hand plate behind the minute hand, the hour hand plate being fitted to the shaft part of the hour hand wheel. The hour hand plate and the hour hand wheel are loosely fitted together with a detent shape, and the timepiece has a module holding portion for positioning the movement and a slight movement of the outer edge portion of the hour hand plate in the axial direction. The hour hand plate pressing portion having an inner diameter smaller than that of the module pressing portion is provided at a cross-sectional position for preventing the hour hand plate from falling off from the movement and preventing the minute hand and the hour hand plate from contacting each other. The structure of the display part of the pointer-type timepiece characterized by that.