公开(公告)号：US3619513A

公开(公告)日：1971-11-09

申请号：US3619513D

申请日：1968-12-04

Applicant: DIGITAL INFORMATION DEVICES

Inventor： MORELLO HERBERT ,  KELLY LEONARD J

IPC: G11B15/675 ,  G11B23/087 ,  G21C17/02 ,  G11B5/54

CPC classification number: G11B23/087 ,  G11B15/675 ,  G21C17/02

Abstract: A tape head assembly is made retractable from the perpendicularly deck in order to permit passage of the tape during automatic threading of the tape deck. The tape is preferably supplied in a cartridge which is automatically positioned and tape is drawn from the cartridge into a tape loop box in which the head assembly is locate and from which it is withdrawn as tape is drawn into the loop box. The head assembly is replaced after the tape loop is past, whereupon the tape is drawn back into operating position over the tape head assembly. The mounting plate for the tape head assembly in this case is withdrawn perpendicularly from the tape deck, using a king post as a guide. The mounting plate for the head assembly is attached to a slidable support which rides on the king post. The slidable support is moved up by attachment to the slidable support of a flexible band which extends about the periphery of an eccentrically mounted circular cam. The band is made adjustable by including in its length a tension spring. Compression spring means is also provided between the cam and the slidable support, whereby the slidable support is urged downwardly away from the cam. The compression spring is further compressed, however, when the head mounting plate bottoms against an indexing surface of the tape deck urging said plate more firmly against the indexing surface.