Patent GB-1479755-A (GB)
Title: Magnetic tape recording and reproducing apparatus
IPC: G11B27/34
Filed: 1974-06-24
Abstract: 1479755 Mode selection in magnetic tape recorders MASUSHITA ELECTRIC INDUSTRIAL CO Ltd 24 June 1974 [28 June 1973 4 July 1973] 27989/74 Heading G5R A magnetic tape recording and playback apparatus has manually operable control members 224, 222 and 225 to select playback, rewind and fast forward wind respectively and members 222 and 225 can be selectively operated to interrupt a playback operation with a rewind or fast forward operation while the playback selector is maintained in its operative position during the interruption to facilitate return to playback immediately at the end of the interruption, a first slidable member 240 operating to lock the rewind 222 and fast forward 225 selectors in their operative positions and a second slidable member 239 operating to lock the playback selector 224 in its operative position, member 240 being shifted by playback selector 224 to a position in which it cannot lock members 222, 225 in their operative positions while the playback selector 224 is in its operative position. Stop 227, rewind 228, record 229, playback 230 fast forward 231 and pause 232 control knobs operate respective sliders 221 to 226, of which sliders 221 to 225 have respective protuberances 233 to 237 co-operating with notches and hooks in latching members 239, 240 movable in opposite directions against a spring 241 acting therebetween. On pushing in playback knob 230, pinch roller 214 engages capstan 215 and head plate 206 is advanced to engage record/playback head 207 with the tape, but an erase head 209 in aholder 208 pivoted to plate 206 does not contact the tape unless record knob 229 is operated simultaneously with play-back knob 230. Fast forward knob 231 or rewind knob 228 can be pushed in whilst in the record or playback mode, without going via STOP, to release pinch roller 214 from capstan 215 and engage fast forward or rewind. Sliders 225 and 222 are not latched by members 239, 240 in this state and release of manual pressure on knob 231 causes a return straight from fast forward to the previously selected record or playback state, but rewind slider 222 is not so releasable because of locking thereof by a hook 265 on a lever 262, a resettable tape counter 219 closing a switch therein when it has wound back to a predetermined count, e.g. 999, whereby a solenoid 266 is energized to pivot lever 262 so releasing rewind slider 222 causing an automatic change straight from rewind to record or playback. On operating rewind knob 228 or fast forward knob 231 from the stop state, the corresponding slider 222 or 225 is latched by member 240. On operating stop knob 227 in any mode members 239, 240 are slid in opposite directions to release any slider 222 to 225 which has been pushed to its operative position, and stop knob 227 or its slider 221 also pivots lever 262 whereby rewind slider 222, if in its operative position, is released from hook 265. Lever 262 may be arranged to lock rewind slider 222 in its operative position only when playback slider 224 is in its operative position. A further manual control knob (302), Fig. 8 (not shown), may be provided to pivot locking lever 262 to release rewind slider 222 without operating stop knob 227 and without waiting for solenoid 266 to be operated, whereby when rewind has been selected straight from record or playback the latter may be resumed immediately at any point on the tape by operation of knob (302).