JPH059669Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a watch case structure that positions the case on the bottom surface of the back cover during automatic assembly of the watch exterior.

[Conventional technology]

FIG. 4 is a sectional view of a case positioning structure conventionally considered, and FIG. 5 is a plan view of FIG. 11 is a watch case, 12 is a watch case transporting pallet, and 12a is a guide pin provided on the transporting pallet 12. The watch case 11 is placed on a conveyor pallet 12 and conveyed by a belt conveyor, and a movement 13, dial 15, hands 16, cover glass 17, etc. are to be attached to the case 11.

[Problem that the invention attempts to solve]

However, in the above-mentioned prior art, a new conveying pallet is required each time the outer shape of the case changes. Automatic assembly, which requires high dimensional accuracy of hands etc., is difficult when positioning in the horizontal direction based on the outer shape of the case and vertical positioning based on the entire bottom of the case back. It was common to have a movement with built-in hands.
The present invention is intended to solve these problems, and its purpose is to provide a watch case that is cost-competitive and allows for fully automated assembly.

[Means for solving problems]

The watch case structure of the present invention includes a case and a movement disposed in the case, and the case has a plurality of protrusions formed to protrude inside the bottom of the case, and the case corresponds to the protrusions. The movement has a blind hole formed in the bottom surface, a plurality of holes are formed in the movement to engage with the projections, and the movement is positioned and fixed to the case.

[Example] Figures 1 and 2 are sectional views of essential parts showing examples of the present invention, and Figure 3 is a plan view showing the relationship between the movement and the case in Figures 1 and 2. Four blind holes 1b for positioning the case are provided in the bottom 1a of the watch case 1 in which the case back and body are integrated. 2 is a pallet used for transporting case 1 during automatic assembly and for positioning during automatic assembly. It is placed on a belt conveyor and used during automatic assembly, and after automatic assembly is completed, it is repeatedly used as pallet 2 for another case 1. Make use of it. 2a is a pallet guide pin used for positioning the case 1. A projection 1c for horizontal positioning with respect to the movement 3 is provided above the blind hole 1b. The movement 3 is guided by the slope 1f of the tip of the protrusion 1c of the case 1, and is assembled into the case 1. The tip 1e of the protrusion 1c is made into the collar 1k by ultrasonic staking, thereby positioning the movement 3 in the upward direction. The direction is determined by the case 1g section. The direction of rotation of the dial plate 5 is determined with respect to the case 1 by a notch 5a. Therefore, for automatic assembly, case 1 is placed on pallet 2,
Case battery cover diameter 1h, battery cover 8, protrusion 1c
a movement 3 having a positioning hole 3a with the
Tariyuzu 4, dial plate 5, integrated with winding stem 4a,
This is done in the order of needle 6 and glass 7. The case 1 is made of a plastic material such as ABS or polycarbonate, and the blind holes 1b and projections 1c can be easily formed therein.

In addition, if the protrusion 1c is provided on a plastic case, the bottom surface 1d usually sinks during molding, making it unsightly, so providing the blind hole 1b under the protrusion 1c brings about a good result in terms of the appearance of the case back. .

Furthermore, by providing the blind hole 1b within the planar external shape of the movement 3 and in the immediate vicinity, it can be used at a common position in all cases, from small to large. Further, the blind hole 1b may be a through hole.

In addition, there is a battery cover inlet diameter 1h into which the battery cover 8 is inserted, a protrusion 1e for positioning with the movement 3, and a lever 4.
The case glue hole 1l into which the dial 5 is inserted, the dial entry diameter 1i of the case into which the dial 5 is inserted, and the case glass entry diameter 1j into which the glass 7 is inserted are the blind hole 1b and the reference plane 1d in the range of A provided near the blind hole. Since it is simultaneously injection molded using plastic as a reference, it is possible to control the position in the horizontal and vertical directions with extremely high precision.

[Effect of idea]

As described above, according to the present invention, the blind holes provided in the bottom of the case enable positioning on the conveying pallet, and assembly using an automatic assembly machine becomes possible. Furthermore, when the case is made of a material such as plastic and a protrusion is provided on the inside of the case, there is a problem that sink marks tend to occur on the bottom surface on the opposite side. By matching the positions, it is possible to eliminate sink marks and obtain a good appearance.

Furthermore, since the protrusion is configured to engage with the hole in the movement, it can be assumed that the size of the movement is approximately constant regardless of the model, so the position of the protrusion, in other words, the position of the blind hole, is One way is determined regardless of the model. In other words, only one type of guide pin for the pallet that engages with the blind hole is required;
Each model can be assembled using different types of transport pallets.
Automatic case assembly can be achieved without the need to replace transport pallets. Therefore, there is no need to replace pallets depending on the model, which was necessary in the past, and it is possible to assemble the exterior of cases from small to large cases on the same line and with the same tools. Moreover, it goes without saying that the cost reduction effect resulting from this is very large.

[Brief explanation of the drawing]

1 and 2 are sectional views of essential parts showing an embodiment of the present invention, and FIG. 3 is a plan view showing the relationship between the movement and the case shown in FIGS. 1 and 2. FIG. 4 is a sectional view showing a conventional embodiment. FIG. 5 is a plan view of FIG. 4. 1...Case, 1a...Bottom, 1b...Blind hole,
1c...Protrusion, 1d...Reference surface, 2...Pallet, 2a...Guide pin, 3...Movement, 4
...Ryuuzu, 5...Dial board, 6...Hand, 7...
glass.

Claims (1)

[Scope of utility model registration request] The case has a case and a movement disposed in the case, and the case has a plurality of protrusions formed to protrude inside the bottom of the case, and a blind hole formed in the bottom of the case corresponding to the protrusions. A watch case structure, characterized in that the movement is formed with a plurality of holes that engage with the protrusions, and the movement is positioned and fixed to the case.