| 摘要 |
<p>A method of making a unitary component part of a tape reel by injection molding is described. The said part is shaped to comprise a cylindrical hub (2) closed at one end by means of an end wall (5) and flanged at its other end to define a side plate (1) for the reel, with the end wall (5) being formed firstly, with an axially disposed protrusion defining a centre of rotation for the reel and secondly, with a plurality of upstanding fixing bosses (7) disposed about the protrusion. A capstan (4) for receiving tape is molded on the side plate (1) concentric with and surrounding the hub (2) with radial reinforcing ribs (3) extending between the hub (2) and the capstan (4); the wall of the capstan (4) being interrupted between a pair of the ribs (3) to leave a gap bounded by end points (9) of the wall of the capstan (4). The bosses (7) are intended for interfitment with holes in a second companion side plate (13) formed separately from and adapted subsequently to be fixed to the unitary component being molded, to form the completed tape reel. The method of the invention is characterised in that in order to mold the said unitary reel component, resin is injected into a mold by way of an injection gate (16), said gate being located on or at the said end wall (5) at a location in sectorial regions (10 in Figures 1, 2 and 6), being two areas of the end wall (5) which are within and bounded by notional lines (and extensions thereof) connecting the axial centre of the tape reel and both end points (9) of the gap in the capstan wall (4). The invention extends to a device for performing the said method and it encompasses components and reels made directly thereby.</p> |
