GB1227834A - - Google Patents

Abstract

1,227,834. Making printing type. BURROUGHS CORP. 1 Nov., 1968 [16 Nov., 1967 (2); 28 Feb., 1968], No. 51854/68. Heading B6W. [Also in Division B3] A method of making printing types comprises punching a pair of substantially parallel, elongated apertures 12, 13 in a metal strip 10, shaping the metal between the apertures into type blanks each with integrally connected head and shank portions 1, 2 by passing the strip through progressive dies, severing each blank from the strip, and forming a printing type character on the head portion 1. The strip 10, which is preferably of soft steel, is fed from a coil through eight working stations in the progressive die. The operations comprise (1) perforating pilot holes 11; (2) punching the apertures 12, 13; (3) forming a blank with the integral head and shank portions 1, 2 which results in excess metal 15 being formed; (4) trimming the excess metal 15; (5) punching a retaining slot 3; (6) finally sizing the blank; (7) partially severing the blank from the strip; and (8) finally severing the blank from the strip. The forming operation at station (3) work hardens the shank portion 2, but as the head portion 1 is not operated on it remains soft. The blanks are deburred by being tumbled in an abrasive filled container. The blank is then secured in a holding fixture comprising a pair of blocks 28, 29, which provide an aperture 30 for accommodating the shank portion 2 of the blank. A cylindrical aperture 31 is formed in the block 28 which communicates with the aperture 30 via a rectangular slot 32. A plug 33 is located in the aperture 31 and comprises a metal disc 34, a resilient body 35, in which is embedded a pin 36 formed with a rectangular extension 37. The extension 37 is located in the slot 32. The blank is supported at the lower end of its head portion 1 by shoulders 38, 39 on the assembled blocks and additional support is provided by a member (41) underneath the shank portion 2, Fig. 7 (not shown). The holding fixture is placed in a die holder A along with a wedge shaped member B. A clamping spindle D exerts pressure on the member B to force the fixture against the opposite wall of the die holder, thereby compressing the body 35 of the plug 33 so that the extension 37 enters into the slot 3 in the blank. A print character is then formed on the head portion 1 by a kneading process.