JPS6111662Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to internally illuminated clocks installed in stations, buildings, etc., and is particularly designed to prevent the movement for driving the pointers and the support member that supports it from appearing as a shadow on the scale plate. This is related to the improvement of.

As is generally known, internally illuminated watches use a milky-white translucent plate for the scale plate, and the illumination light source and pointer drive movement are attached to the back of the plate, and the pointer shaft protruding from the movement is attached to the dial. A clock and a minute hand or, if necessary, a second hand are attached to the tip of the dial to display the time along the scale plate. A transparent glass plate is attached to the outside of these points to prevent dirt, rainwater, etc. from entering the inside from the outside.

Since the scale plate is constructed of a semi-transparent plate and is illuminated from the back side, there is a drawback that the movement appears as a shadow when viewed from the front side.

In particular, when the movement 2 is mounted directly on the back side of the scale plate 1 as shown in Fig. 1, and a light source 3 such as an annular fluorescent lamp is placed behind it, when viewed from the front side (direction of arrow 4), Movement 2 appears as a shadow. In FIG. 1, 5 is a transparent glass plate, 6 is a pointer shaft protruding from the movement 2, 7 is an hour hand, 8 is a minute hand, and 9 is a tightening boss for tightening the movement 2 to the scale plate 1. Also, although the figure shows a case with a single-sided display, there are also watches with a double-sided display.

Various structures have been considered in the past in order to prevent the movement 2 from appearing as a shadow. FIG. 2 shows an example. The example in FIG. 2 shows a case where the movement 2 is attached to the scale plate 1 via a spacer 10. By lifting the movement 2 from the back surface of the scale plate 1 using the spacer 10 in this way, the shadow of the movement 2 can be prevented from appearing on the front side.

However, in order to attach the spacer 10 to the scale plate 1, it is necessary to screw the screw 11 into the spacer 10 from the front side of the scale plate 2. Therefore, there is a drawback that the head of the screw 11 is exposed on the front side of the scale plate 1.

For this reason, conventionally, as shown in FIG. 3, a support 13 is generally installed at the center of the interior of the case 12, and the movement 2 is mounted on the support 13. By attaching the movement 2 to the pillar 13 in this way, the heads of the screws for attaching the movement 2 do not appear on the scale plate 1, and the shadow of the movement 2 does not appear on the front side, which is convenient. good.

However, when the movement 2 is mounted on the support 13, it is difficult to align the axis of the pointer shaft 6 with the axis of the scale plate 1, which has the disadvantage that adjustment work for alignment is time-consuming. . However, in order to ensure that the axes are aligned accurately, the mounting accuracy of the support 13 to the case 12 and the positional accuracy of the mounting hole for the movement 2 formed in the support 13 are required, which increases the cost accordingly. There are also some drawbacks.

The purpose of this invention was to simplify the structure to prevent the shadow of the movement from appearing on the front side, and to make it easy to assemble and to mount the pointer shaft on the scale plate while aligning the axis accurately. It is possible to provide internally illuminated clocks.

An embodiment of this invention will be described below in detail with reference to the drawings.

FIG. 4 shows an embodiment of this invention. In this invention, the pointer shaft 6 protrudes from the movement 2.
, one end of this sleeve 14 is fixed to the movement 2, and the other end is fixed to the back side of the scale plate 1, and in this way, the movement 2 is attached to the back side of the scale plate 1 via the sleeve 14. It is composed of

The sleeve 14 has a flange surface 14a at one end, and this flange surface 14a is brought into contact with the lead-out surface of the pointer shaft 6 of the movement 2. A protrusion 14b is formed on the flange surface 14a as necessary, and this protrusion 14
b is inserted into a hole formed in the surface of the movement 2 to prevent the sleeve 14 and the movement 2 from rotating relative to each other. A cylindrical portion 14c is formed at the other end of the sleeve 14 so as to surround the center hole, and this cylindrical portion 14c is inserted into a hole formed in the scale plate 1, thereby connecting the axis of the sleeve 14 and the scale plate. 1
are aligned with the axes of. On the other hand, a tightening boss 9 is inserted into the center hole of the sleeve 14. Tightening boss 9
A screw 9a is formed at the tip of the movement 2, and this screw 9a is screwed into a female thread (this is conventionally formed in the movement) formed at the lead-out portion of the pointer shaft 6 of the movement 2. A flange 9b is formed on the other end side of the tightening boss 9, and this flange 9
A clamping force is applied between the movement 2, the sleeve 14, and the scale plate 1 by b, and the movement 2 is supported on the back side of the scale plate 1.

With this configuration, when the movement 2 is internally illuminated by the light source 3 placed behind it, the shadow of the movement 2 will not appear on the front side because the movement 2 is floating from the back side of the scale plate 1 by the sleeve 14. There is no. Since the sleeve 14 is made of a transparent material such as acrylic resin, the shadow of the sleeve 14 can be completely hidden from the front side even if the diameter of the sleeve is larger than the width of the hands 7 and 8. Therefore, the sleeve 14 and the scale plate 1 come into contact with each other over a relatively wide contact surface, and are stably held.

Moreover, since the sleeve 14 is placed over the tightening boss 9 and the tightening boss 9 passes through the center hole of the scale plate and is tightened, there is no play between the tightening boss 9 and the through hole of the sleeve 14. By making small the play between the center hole of the scale plate 1 and the circumferential surface of the cylindrical part 14c formed in the sleeve 14, the axes of the pointer shaft 6 and the scale plate 1 are automatically aligned. Not only do they match and are easy to assemble, but also the axis of the pointer shaft 6 and the scale plate 1
It is possible to obtain an internally illuminated clock whose axis accurately matches the axis of the clock.

As explained above, according to this invention, the sleeve 14 is attached to the movement 2 in advance and integrated.
By attaching the sleeve 14 to the scale plate 1, the movement 2 can be attached to the back side of the scale member 1. This makes assembly extremely easy. Moreover, the relationship between the pointer shaft 6 and the scale plate 1 is such that their axes automatically coincide when the cylindrical portion 14c is inserted into the hole in the scale plate 1, so no adjustment is required to align the axes.

As described above, according to this invention, it is possible to obtain an internally illuminated timepiece that is easy to assemble and in which the axis of the scale plate 1 and the pointer shaft 6 coincide with each other with high accuracy, and a significant reduction in cost can be expected.

Further, in the above description, the movement 2 is attached to the back side of the scale plate 1 using the tightening boss 9, but the invention is not limited to this. For example, screws can be screwed into the sleeve 14 from the front side of the scale plate 1, and 14
may be configured to be attached to the scale plate 1, and even in this case, since the screw for attaching it is within the diameter range of the sleeve 14, this screw is hidden by the hands 7 and 8, so it cannot be seen from the front side. You can reach your initial goal without being visible.

[Brief explanation of the drawing]

1 to 3 are sectional views explaining the internal structure of a conventional internally illuminated timepiece, and FIG. 4 is an enlarged sectional view showing an embodiment of this invention. 1: Scale plate, 2: Movement, 3: Light source,
5: Transparent glass, 6: Pointer shaft, 7, 8: Pointers,
9: Tightening boss, 14: Sleeve.

Claims (1)

[Scope of utility model registration request] A mounting hole is formed at the axial center position of the sleeve formed of a transparent material, and a pointer shaft protruding from the movement is inserted through this mounting hole, and the sleeve is placed over the pointer shaft, so that the sleeve faces the movement. A flange surface having an area approximately equal to the opposing surface of the movement is formed at one end, a contact surface that contacts the back surface of a scale plate is formed at the other end of the sleeve, and the scale plate is provided with the pointer. A center hole is formed through which the shaft is inserted, and a cylindrical portion protruding from the contact surface is formed around the mounting hole, and by inserting this cylindrical portion into the center hole, the pointer shaft and the scale plate are connected. An internally illuminated timepiece, the axes of which are aligned, a light source is provided at the rear of the sleeve to illuminate the scale plate from the back side, and the movement is fixed to the back side of the scale plate via the sleeve.