CENTRING BUSH FOR CENTRING LACQUE FOILS FOR VIDEO DISCS AND GRAMOPHONE RECORDS

摘要

1413207 Centering disc records TELDEC TELEFUNKEN-DECCA SCHALLPLATTEN GmbH 1 March 1973 [1 March 1972] 10026/73 Addition to 1367798 Heading G5R The lacquer disc 1 and its centering hollow core 2a, 2b described in parent Specification 1,367,798 are centred on the cutting plate 8 of the groove cutting apparatus by a bush 5 having a first bore 4 corresponding to the outer diameter of the part 2a of the core and a second bore 6 corresponding to the pin. 7 of the cutting plate.. As described in the parent a record negative or stamper is electroformed from the disc 1 with attached hollow core 2a, 2b.