Patent GB-824563-A (GB)
Title: Improvements in or relating to magnetic sound recording and reproducing apparatus
IPC: G11B15/10
Filed: 1955-05-16
Abstract: 824,563. Sound recording and reproducing apparatus. DAVIES, T. L. June 7, 1956 [May 16, 1955], No. 14011/55. Class 40 (2). In magnetic sound-recording and reproducing apparatus for tape or wire having control means whereby a presser roller, adapted to press the tape into engagement with a magnetic head or heads and with a capstan or driving roller, is maintained out of engagement with the capstan or driving roller when the apparatus is not in operation, and means whereby operation of the tape recording and reproducing controls cannot be effected when the apparatus has been set for rewinding the tape and vice versa, there are a number of selectively-operable push-rods which upon being selectively depressed actuate mechanism for applying and releasing braking means and comprising a plate member 12 pivotallydisposed at the end of a push-rod 5 and adapted to be engaged thereby, the member carrying a spring-loaded lever arm 17 pivotally attached to a lever arm 18 operatively connected to the brakes, push-rods 1, 2 which control the recording and reproducing operations and adapted to effect engagement with a plate member 11 pivotally mounted below the lower ends of the push-rods, the member being mounted on a spindle 7 carrying a link member 14 adapted to be displaced upon depression of either of the push-rods 1, 2, and push-rods 3, 4 which control the tape or wire winding operations and are adapted to engage a plate member 10 attached to a spindle 6 disposed at the lower ends of the push-rods, the spindle 6 carrying a link member 13 at one end thereof and a spring-loaded arm 15 at the other end which are adapted to be displaced upon actuation of either of the push rods 3, 4. As shown, a switch unit includes pushrods 1 . . . 5, the selective operation of which serves to control the desired operations of the apparatus, i.e. record, playback, fast forward, fast rewind, and stop, and the lever 14 can be interlockingly engaged by the lever 13, such interlocking being assisted by the spring-loaded arm 15 on the spindle 6. The spring-loaded arm 18 is adapted to apply the brakes, and the spindle 7 also mounts an arm 19 which is coupled to a rod 20 pivotally attached to an arm 21 secured to the tape presser mechanism. In operation, depression of push-rod 5 causes the arm 17 to apply the brakes, the setting of the push-rods for any previous operation being cancelled by known latch release mechanism embodied in the switch. When push-rods 1 or 2 are depressed push-rod 5 is released by the latch release mechanism and the arms 17 and 18 are retracted to release the brakes, the spindle 7 being rotated to move the link 14 into locking engagement with the link 13 to lock the plate member 10 and prevent operation of the pushrods 3 or 4; rotation of the spindle 7 effects, through the arms 19, 21, engagement of the pinch-wheel and presser pad assembly against the tape, capstan and recording heads to result in traction of the tape which is disposed between the pinch-wheel and the capstan. Operation of the push-rods 1 or 2 is cancelled by depression of the push-rod 5, and depression of push-rods 3 or 4 causes rotation of the spindle whereby the link 13 is engaged with the link 14 to lock the member 11 and prevent operation of the pushrods 1 or 2. In a modification, the link 14 has a notch or cut-away portion to provide a clearance between the co-operative face thereof and the extremity of the link 13, such clearance allowing the push-rods 3 or 4 to be depressed immediately following depression of the push-rods 1 or 2 and thereby eliminating the intermediate operation of the push-rod 5.