JPS618319A - Molding method of bearing member - Google Patents

Abstract

PURPOSE:To achieve a higher working efficiency of molding and a massproduction eliminating centering work depending on cutting as post-working, by mounting a rigid ring with the circumferential surface being a circular arc one mounted to an insert shaft as inserted thereinto to be arranged into a clearance of a bearing section in a cavity. CONSTITUTION:A ring 2 is mounted to an insert shaft as inserted thereinto beforehand. First, a shaft is set into a cavity, where a ring 2 is arranged in a clearance section of one centering bearing section 1a while the shaft is inserted through the clearance of the other bearing section 1b and then, the cavity is filled with a melt plastics. In this manner, the ring 2 of the clearance section is covered with plastics from the circular arc surface side and after the releasing of the molding from the mold, the ring 2 is fastened temporarily to the bearing section 1a. In the centering between a ring hole 2a of one bearing section 1a and a shaft hole 1b1 of the other bearing section 1b, first a shaft is inserted through the ring hole 2a and then, moved vertically and horizontally centered on the ring 2 to insert the tip thereof into the shaft hole 1b1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a forming force method for a bearing member such as a printer carriage having a bearing portion bearing coaxial or parallel axes.

Conventional technology Bearing members, which are plastic molded products such as carriers and ridges in chassis and printer heads, are deformed due to the ms, shape, etc. of the plastic after being demolded. Since the centers of the opposing shaft holes are misaligned, alignment work is required in the final stage of the product. Conventionally, this alignment work involves forming the inner diameter of the shaft hole of the bearing member into a small size in the molding stage in advance, cutting the entire inner circumference of each shaft hole after demolding, and aligning both shaft holes. There is.

Problems to be Solved by the Invention However, according to the conventional example, alignment work by cutting is required as a post-processing, and furthermore, this alignment is N degrees? Since it is not easy to take out the mold, the molding efficiency is low and there are many problems with poor reproductive performance.

Means for Resolving the Problems The present invention involves attaching a rigid ring whose outer peripheral surface is an arcuate surface to the insert shaft in an inserted state, and first inserting a plurality of bearings St in a cavity into each of the cavities formed by the ring. Core fI! 4. Place the above-mentioned ring in the cavity of the straightening bearing part, then fill the above-mentioned cavity with molten plastic, and open the shaft hole in the bearing part and the above-mentioned ring. A bearing member that meets the core adjustment bearing part that is temporarily attached inside? It is something to be molded. Alignment is performed by using the core metal reference of the bearing part between the opposing or parallel bearings for which the shaft hole is to be grown, and following this core with the core of the ring of the bearing part for core adjustment.

EXAMPLES Example 1 of the Present Invention A molded article, which is a bearing member shown in FIGS. 1 to 3, is molded by the injection molding force method using a stumbling mold, which will be explained based on the drawings.

This molded product 1 has bearing parts 1a on both sides facing inward, and a rigid ring 2 whose outer peripheral surface is an arcuate shape is temporarily embedded in the force center adjustment bearing 81a. . The hole 2a of the ring 2 and the external force bearing, that is, the in-length
After attaching the ring 2 to the shaft in an inserted state, first set it in the shaft r cavity. It is placed in the gap of the adjustment bearing part 1a, the shaft is inserted into the gap of the external force bearing part 1b, and then the cavity is completely filled with m-fusion plastic.

Ring 2 in the gap between the scrapers is covered with plastic from the arcuate side, and after demolding the molded product, the ring is attached to the bearing IfI11b.
Temporarily fastened.

Alignment between the ring hole 2a of one bearing part 1& and the shaft hole 1b of the other bearing part 1b is performed during product assembly 1) To explain this alignment, first, the shaft 3t ring hole 2& or For example, as shown in Fig. 4.5, first insert the shaft through the ring hole 2a, and then center the shaft around the ring 2 temporarily fixed to the bearing 1111a. Move the knife left and right to align the center of the shaft tip with the shaft hole lb, and insert the tip into the shaft hole. At the same time as this insertion, the ring 2 is aligned with respect to the shaft hole 1b. Therefore, the centers of bearings 1111a and 1b always coincide with the center of bearing slb.

Other examples of bearing members are shown in FIGS. 6 and 7.

In the example illustrated in dX6, bearings 11a and 11b are formed on the side wall of a chassis 11, which is a molded product, and a ring 2 is temporarily embedded in the force adjustment bearing 11a. The forming force method and alignment method in this example are also substantially the same as in the upper row.

In the molded product 111 shown in FIG. 7, bearing portions 111m are provided at three locations.
, 111b and 1llc are provided, the shaft 3 (i-supported by the bearing parts 111a and 1llb, and the remaining bearing part 111c
The shaft 3al is parallel to the shaft 3, and the bearing parts 111a and 1lle are each embedded with a ring 2.21 inside to serve as a center adjustment bearing part.

To explain the molding method, two in-length shafts are set in parallel to each other in the cavity, and attached to each shaft.
111at- is placed in the cavity to be formed, and the cavity is filled with molten plastic to form a molded product.

Also, to explain the centering of the bearings 111a, 111b, and 111e, move the shaft 3 from the ring 2 of the bearing 11111m to the bearing g (1111bo@hole 1.1 i b S
At the time when the T shell is penetrated, the core of the link 2 of the bearing portion 111a is aligned with the core of the shaft hole. Then, the shaft 3at is passed through the ring 2 of the bearing 1111111e, and the shaft 3a'jz is set parallel to the shaft 3 by moving the entire ring around the shaft. In this way, the core of the bearing @ 111c is aligned parallel to the core of the bearing portion 111b. In this case, axis 3 was used as a reference, but axis 3m4 may be used as reference.

In this example, the bearing part 111a may have the same configuration as the bearing @11 l b without having to be made into a fine core fA alignment bearing part. In this case, when aligning, the shaft 3 is used as a reference for the material, and the shaft 3a follows the shaft.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, as described in detail, a center adjustment bearing having a ring can be formed by IRI in the forming process.15. Since the ring is temporarily attached to the bearing part, there is no need for cutting work, which is labor-intensive and difficult to achieve precision due to the core, making the molding of the bearing member more efficient. It can be carried out efficiently and molded products can be produced from Sumitomo.

[Brief explanation of the drawing]

Figures 41 to 5 show an embodiment of the bearing member, and Figure 5g1 is a partially cutaway u+j front view, and Figure 2 is a line II-II line m in Figure 1.
Top view, Figure 3 is a partially cutaway half-view, Figure 4 is a partial #fr front view showing the state of insertion into the Rondo 7 force bearing, and Figure 5 is Figure 4 V-V. The line sectional view, FIGS. 6 and 7 are perspective views of shaft/receiving members of other embodiments, respectively. 1 , 11 , 111 ... Molded product, 1 a * 11
a e311 a, 111 c-base leg adjustment bearing part,
lb, 11b, 111b...l1II receiving part, 1b
1.11b, from 11th construction I...shaft hole, 2...ring, 3+3a...shaft. Above H 3rd garden

Claims (1)

[Claims] After arranging a rigid ring with an arcuate outer circumferential surface, which is inserted into the insert shaft and attached to the insert shaft, in the cavity of the core adjustment bearing part among the cavities forming each of the plurality of bearing parts in the cavity, the ring is melted into the cavity. 1. A method of molding a bearing member, which comprises filling the bearing member with plastic and molding the bearing member having a core adjustment bearing portion inside which holds the ring in a temporarily fixed state.