| 摘要 |
1,157,249. Copying and editing magnetic records. INTERNATIONAL BUSINESS MACHINES CORP. May 23, 1968 [June 8, 1967], No.24575/68. Heading G5R. A shortened version of a recording on a master tape 10 is produced on a copy tape 20 by intermittent engagement and contact printing between the two tapes, the master being moved on relative to the copy when they are out of engagement. As shown, the copy tape 20 is held by a brake 62 against the pull of a slipping clutch 37 on a take-up reel 22 but moves with the master tape 10 when the two tapes are intermittently brought together by means of a mutilated roller 14 or a roller (14E) Fig.9 (not shown) movable under the control of a solenoid (81). At each disengagement the copy-tape 20 is backspaced slightly by a spring arrangement 70 to minimise the length of distorted recording produced at the times of engagement and disengagement. These distorted portions may be eliminated by switching off the bias field source 26 at such times Figs .7 and 9 (not shown). The brake 62 and backspacing means 70 may be combined as a single block of resilient rubber (61), Fig. 7 (not shown). |
