JPS6079922A - Manufacture of plastic parts - Google Patents

Abstract

PURPOSE:To obtain the plastic parts without necessity of secondary processing by a method in which after perforating plastic parts forming windows and the holes for holding parts have been formed on a belt like member, the parts (holding portion) and bridges are injection molded in each specified portion and further the bridges are cut. CONSTITUTION:The pilot holes 2 serving both the perforation for injection molding and the perforation for automatic assembling, the windows 3 for forming parts and the holes 4 for holding parts are formed on the belt like member 1 made of a metal, etc. by the means such as a press, etc. Next, a plastic parts 5 are integrally formed with said parts forming windows 3 by an injection molding machine, while setting said perforation as the reference, and the holding portions 6 of the parts are integrally formed with said hole 4 for holding parts in the same manner, and further bridges 7 are also integrally formed with the joint portions of said forming parts windows 3 and the holes 4 for holding parts similarly. Then, said bridges and the parts 5 are cut, and the objective parts are obtained by performing automatic assembling. Further, projected spacer pins 8 are preferably formed on said belt like member based on the thickness of the parts.

Description

[Detailed description of the invention] Introduction to the manufacturing method of tick parts.

Conventionally, the main manufacturing method for small plastic parts has been molding for funeral products. However, in recent years, as the automatic assembly of ILT watches has progressed, the method of supplying parts using a belt-shaped carrier has been replaced as an effective method for supplying parts, compared to the conventional method. The 1'L product manufacturing method required additional secondary processing such as tape packing.

The present invention is a method for manufacturing plastic parts that eliminates these drawbacks.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in Fig. 1, a pilot hole 2, which also serves as a feed hole for injection molding and a feed hole for automatic assembly, a part molding hole 3, and a part holding hole 4 are formed in a metal 6 carrier 1 by means such as a press. Next, the parts 5, part holding parts 6, connecting bridges 7, and spacer bins 8 for lamination are injection molded.Later, during automatic assembly, 1% + l
The bridge 7 and the ττIS product 5 are cut and automatically assembled. In addition, the A-AI sectional view in FIG. 1 is shown in FIG. 2, and the B-AI sectional view in FIG.
It is shown in FIG. 3, which is a cross-sectional view of Bl.

As described above, according to the present invention, secondary processing such as newly packing a single item with tape becomes unnecessary. In addition, the spacer bins 8 arranged on both sides of the strip material avoid contact between parts, and have the effect of preventing scratches on parts and smoothing automatic assembly and supply.

[Brief explanation of drawings]

1, 2, and 3 show an embodiment of the method for manufacturing plastic parts according to the present invention, and FIG. 1 is a plan view, and FIG.
The figure is an A-AI sectional view, and FIG. 3 is a B, -] 31 sectional view. 10. Metal carrier 20. Byron) K360 parts molded window 400 parts holding large 5. . Parts 60. Holding part 70. Bridge 8. ,, Spacer pins and above Applicant Seiko Electronic Industries Co., Ltd. Agent Patent Attorney Mogami Figure 1 Figure 2 J13 Figure 6

Claims (1)

[Claims] ←) A step of forming a feed hole for injection molding, a plastic part molding window, and a part holding hole for holding the part in a strip material such as metal, a step of forming a feed hole for injection molding, a plastic part molding window, and a part holding hole for holding the part, to the feed hole as a t-reference. a plastic component in the plastic component molding window, a component holder in the component holding hole, and a bridge that connects the plastic component to the contact holder at a connecting portion between the plastic component molding window and the component holding hole. A method of manufacturing a plastic part, comprising the steps of integrally injection molding the bridge, and cutting the bridge. (2) The band-shaped material is formed with a spacer pin T-molded which has a convex shape according to the thickness of the part.
Method of manufacturing plastic parts described in Section 1.