GB1160251A - Improvements in or relating to Selective Printing Apparatus - Google Patents

Abstract

1,160,251. Selective printing. INTERNATIONAL COMPUTERS Ltd. 18 July, 1967 [30 July, 1966], No. 34343/66. Heading B6F. [Also in Division G4] Type-cylinder machines; disposition of characters.-The type-cylinder of the machine carries a plurality of circumferential bands of typecharacters 3a, 4a, 3b, 4b &c., each band including some characters which are different from the characters included in adjacent bands, has a line of print hammers 5 selectively operable to print characters on a record medium 7, and has means to produce relative movement between the record medium and the typecylinder in a direction parallel to its axis to select a particular circumferential band. The arrangements allows a greater number of characters to be printed without increasing the diameter of the cylinder. The arrangement of characters may be such that each band contains a common first set of characters and part of a second set being different for each group of bands. A print cycle may be started at any time and a time gap is allowed before the starting of a subsequent cycle to allow time for movement of the web or type cylinder. A set of characters may extend over say up to four bands and include both Roman and Cyrillic type. Cylinder drive and line-spacing.-A motor 10 continuously rotates the type-cylinder and linespacing is effected through a gearing 25 which gives a step feed. Pin-tractor feed and transverse movement of web.-Pin tractors are adjustable to suit different width papers and are axially shifted, so that hammers may print from different columns of type, by shifting housings 16 carrying the sprocket wheels. The housings 16 slide axially each half-cycle of a cam 21 in response to a pin 22 riding on it. A spring 23 biases the housing 16 and the pin into continuous contact with the cam 21. Axial movement of type-cylinder.-This may be effected in a similar manner to the movement of the tractor feeds.