GB800638A - Improvements in or relating to magnetic recorders and reproducers - Google Patents

Abstract

800,638. Magnetic recording and reproducing apparatus. PHILIPS ELECTRICAL INDUSTRIES, Ltd. June 7, 1956 [June 10, 1955], No. 17633/56. Class 40 (2). A magnetic record apparatus employs detachable cassettes containing spools driven by means of friction wheels 19 provided in the cassettes in proximity to their edge and brought into and out of engagement with a driving-shaft 3 or 6 by the tilting of the cassette about supports constituting a tilting axis. The cassette 10, which is insertable into an opening 2 in the apparatus, contains turntables 17 frictionally coupled to supply and take-up spools carrying the record tape 21 which passes from one spool to the other over guide pulleys 23 and a roller 14 supported between ears 13 acting as a guide for the tape. The friction wheels 19 are coupled to the turntables 17 by belts 20. The cassette is provided with domes 12 which engage sockets 7a in the supports 7 and form the tilting axis for the cassette, which is held in the neutral position, shown in Fig. 2, by spring arms 8 which engage notches 9 in the cassette. A normal forward drive is effected by tilting the cassette to the right, as shown by the chain-dotted position in Fig. 2, in which position tape 21 is gripped between the driving capstan shaft 6 and one of the wheels 19 whereby the tape is drawn across the erazing head 4 and record/reproduce head 5, in which position the cassette is held by the engagement of the springs 8 with further notches 9a. A fast rewind is effected by tilting the cassette back through the neutral position until the tape 21 is gripped between driving roller 3 and the other wheel 19, in which position it is again held by springs and notches (not shown) on the other side of the cassette. A fast forward drive may be carried out by removing the cassette and replacing it in the reverse position and again tilting it to the left. Means indicating the amount of tape on a particular spool is provided by a pointer 26 pivoted at 25 and drawn across a scale 38 by a duplex slotted arm 30 pivoted at 29 and having a pin 31 which engages the surface of the tape on one of the spools. Contacts 37 at each end of the scale 38 are provided to complete an electrical circuit with the pointer 26 for the purpose of releasing the cassettes to the neutral position by means of an electromagnetic device, and for the same purpose a sliding contact 39, Fig. 6, is provided for carrying out a similar operation at any desired part of the tape. The electromagnetic device comprises spring-loaded latches 45 which hold the cassette down in the tilted position against a leaf-spring 49 until a current in the coil releases them. A plurality of apertures may be arranged side-by-side so that several cassettes may be loaded into the apparatus at the same time, and one cassette may be released to an operative position automatically by the electromagnetic device at the same time that a previous cassette has been released to either a neutral or rewind position.