GB1151527A - Improvements in and relating to Tape Recorder Sound Systems - Google Patents

Abstract

1,151,527. Tape recording apparatus. R. W. FRIEDEL. 10 Aug., 1967 [10 Aug., 1966], No. 35894/66. Heading G5R. A tape recording machine comprises a first electric motor capable of being coupled by friction gearing to drive a capstan at a first constant speed, a second electric motor continuously coupled with the capstan and arranged when energized to drive the capstan at a second, different, constant speed, and means controlled simultaneously with the energization of the second motor for disengaging the friction gearing. As shown, one of the slave (magnetic) machines of a language laboratory includes a plate 40 carrying laterally-displaceable bearings of two spool spindles 41, 42 and a main drive motor 43 having a spindle with drive surfaces 44 and 45 of different diameters. Playback or normal recording.-Surface 45 on the drive spindle drives the flywheel 46 of a capstan 48 through a spring-loaded friction wheel 47. The tape passes from a spool on spindle 42, past a head assembly, round capstan 48 and on to a spool on spindle 41 (tape, spools and head assembly not shown). The tape is pressed against capstan 48 by a pinch wheel 50 mounted on a movable carrier 51. Rapid wind or re-wind.-Either spindle 41 is moved laterally, to bring a drive surface 56 on a wheel on spindle 41 into contact with an intermediate pulley 57 contacting drive spindle surface 44, or spindle 42 is moved laterally to bring a drive surface 58 on a wheel on spindle 42 into contact directly with drive spindle surface 44. Higher-speed recording.-When. the " highspeed " button of array 52 is depressed, pinchwheel carrier 51 is moved so that a pin 65 extending from it operates a microswitch 64. After a delay of, e.g., half a second during which time the tape and spools are accelerated from rest by the normal-speed driving means, microswitch 64 energizes a solenoid 66, which disengages friction wheel 47 and operates a switch 67. Switch 67 switches on an auxiliary motor 60 which drives (61, 62) a further pulley 63 on the capstan. At the same time the pinch wheel is brought into contact with the capstan. The tape speed is now not less than twice, e.g. from four to ten times (preferably four times) the normal speed. Programme material on a master tape on the master machine is now reproduced there, and the signal is transmitted to the slave machine for re-recording on the first track of the slave tape. Preferably, for languagelaboratory use, microswitch 64 is omitted from the slave machines, and the operation of the master and slave machines is synchronized by providing switching means on the master console which control the operation of the solenoid 66. Parts required for normal-speed forward movement may be omitted from the master machine.