Patent GB-1338578-A (GB)
Title: Magnetic recording-reproducing device
IPC: G11B15/18
Filed: 1970-11-10
Abstract: 1338578 Magnetic recording and playback system CANON KK 10 Nov 1970 [13 Nov 1969] 53427/70 Heading G5R In a magnetic recording and playback system, particularly for teaching or dictation purposes, each unit of information pre-recorded on a master tape in reel-reel cassette 4, is played back by a first record/playback device and re-recorded in an endless track in a second record/playback device including a cassette 5 and subsequently played back as often as required by the second device. When used for teaching the endless track of the second device, which can be on endless tape, is at least twice as long as that required for recording the longest unit of information and a further track is provided on which a student can record an attempt at repeating the information. With both cassettes in the machine operation of playback key 17 moves a slide lever 207 whereby brake arm 110 is actuated to release the brakes on the rims 105 and 106 of the reels of cassette 4 and drive roller 107 is urged into contact with rim 106 of the tape up reel. In addition a plate 120 is moved to pinch the master tape between capstan 118 and pinch roller 119, to move heads 126, 127 into contact with the tape and to move a second movable plate 154, which changes over switch SW2 to energize a common drive motor 161 and amplifying apparatus. The plate 154 also acts via levers 151, 153 to pivot a pinch roller urge arm 134 to move the tape in cassette 5 into contact with drive capstan 136. Thus a unit of information on the master tape is played back via loud-speaker 154 and is also recorded on the endless tape in cassette 5. On operation of the stop key 16 the apparatus is returned to its initial position. Figs. 4 and 5 (not shown) indicate the fast forward drive and rewind drive arrangements for the tape in the reel-to-reel cassette 4 which are actuated on operation of keys 18, 19. Where the master tape cassette has been pre-recorded its identifying recess is detected by member 129 which acts on member 128 to prevent operation of record key 20. For repeated playback of the information transferred to the tape in cassette 5, repeat key 15 is actuated. This moves movable plate 154 which as previously indicated actuates the motor and amplifier switches and also pivots the pinch roller urge arm 134 to move the tape into contact with capstan 136. By operation of a switch 10 on hand microphone 9 a student can record his version of the information on a second track on the tape 131 and can then hear this played back with or after the transferred recording.  Figs. 14 and 15 (not shown) indicate respectively the system control circuit for motor drive, head switching &c. and the bias oscillation circuit with constant output control.  The cassette 5 is provided with a pair of recesses on each side wall 149, 150, 301, 302 which co-operate with rollers 144, 145 to hold the cassette in operative and inoperative positions. In addition tape pads 139, 140 are provided for urging the tape into contact with heads 142, 143, the heads being mounted on a support arm 141 which is urged outwardly by plate spring 138. Figs. 10-13 (not shown) show further pad support arm and spring arrangements.