Browse Prior Art Database

Molding Technique

IP.com Disclosure Number: IPCOM000046174D
Original Publication Date: 1983-Jun-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Steen, MJ: AUTHOR [+2]

Abstract

A cantilevered head carriage is molded by using a molding tool which accurately locates a U-shaped flexure spring in the mold prior to mold injection.

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Molding Technique

A cantilevered head carriage is molded by using a molding tool which accurately locates a U-shaped flexure spring in the mold prior to mold injection.

Figs. 1 and 2 show the finished article, namely, a cantilevered head carriage 15 whose magnetic transducing head 17 reads and writes on the upper surface of diskette 22, as the head is moved from track to track by operation of cam 20 and roller bearing 19.

Carriage 15 is an injection molded article which includes a U- shaped metal spring 11 (Fig. 3).

Base 10 is non-rotatably mounted in Fig. 1, and the four exposed portions 23 of spring 11 (Fig. 2) are the points of flexure of a parallelogram.

The two extending arms of the spring are stiffened by plastic pieces 13. The spring's "U" supports plastic end block 26, which in turn supports head 17.

Fig. 3 shows spring 11 and the holes which are formed in the spring to insure that its various molded plastic parts securely hold the spring.

In order for head 17 to remain in exactly the same plane, parallel to the magnetic recording disk within diskette 22, for all positions of the head, spring portions 23 must occupy planes which are perpendicular to the plane of the disk.

Prior to molding, spring 11 is placed within the mold (Fig. 3), and is held by six metal pins 30.

Each pin 30 includes a slot which is just slightly larger than spring 11 is thick, for example .00l5 inch.

At the four flexure points 23, the mold includes a fixed metal wall member 31 whose...