GB1122831A - Telegraph printers - Google Patents

Abstract

1,122,831. Teleprinters. TELETYPE CORP. 6 Oct., 1965 [15 Oct., 1964], No. 42342/65. Heading B6F. Machines with type on endless bands.-A page-width teleprinter comprises an endless continuously driven type-belt 52, Fig. 2, an electrically operated hammer carriage mechanism 83 advanced forwardly and backwardly along the printing line, a selector arrangement settable to any one of a plurality of conditions each representative of respective code combination signals, and means to determine the condition of the selector so as to operate the hammer as the required character passes or effect other functions. Hammer arrangement; letterspacing; carriage.-An electrically actuated hammer 51, Fig. 3 (not shown), is mounted on the carriage frame 83 slidable across the machine on rods 85, 86. It is drawn across in letter-spacing direction by a driving pulley 94 having a toothed flange 98 advanced by a pawl 99 cyclically reciprocated from one of a series of intelligence and function cam 153-155, Fig. 2. The carriage advancing cam 154 operates lever 156 with an arm 160 which is linked to the pawl 99. Power carriage-return; carriage-release.-The hammer carriage is returned by a spring in the pulley 94 which is wound up by the letterspacing power movements of the pawl 99. The pawl 99 is disconnected by operation of an electromagnet 111, Fig. 8, armature 112, and upper end of release lever engages a retaining pawl 100, which is moved away from the teeth of the ratchet and in turn disconnects the driving pawl 99. If a carriage-return signal is not received when the carriage reaches the righthand end of its travel it is automatically returned to its starting position because the carriage engages a switch mechanism 108-110 which operates the carriage-release magnet 111, Fig. 8. During carriage-return the pawls are latched clear by notched levers 117; this lever is released by a trip member 122 when carriagereturn is completed. Permutation selector mechanism.-The printer is cyclically operated and effects a character print or function each half-cycle under the control of a five level start-stop permutation code combination signals. Upon receipt of a spacing signal indicating the start of a code combination an electromagnet 136, Fig. 4, is released and a half-cycle rotation of a cam-shaft 135, Fig. 2, ensues to rotate five intelligence cams 153, the carriage driving cam 154 and a disc driving cam 155. The cams operate levers 165, Fig. 4, and push-levers 170. Each push-lever 170 has a selector member 173 and an actuator bail 175 operated from cam lever 177 and cam 155. The selector member 173 co-operates with two disc actuators 179, 180 to rotate five discs 181 variously notched so that only one pin 196 can pivot downwardly on its fulcrum plate 188. When the selected pin 196 pivots downwardly it causes an engagement with a cammed end 208 of a contact actuating spring 209 which causes electromagnetic operation of the hammer mechanism or other function at the requisite time. The type-belt is synchronized with the selector mechanism by a slot 74 and a feeler 80 mounted on the carriage. Line-spacing.-A paper web 36, Fig. 5, not shown, is advanced upon the operation of an electromagnet 25. This draws a blocking extension 29 out of the path of a clutch release arm of a half-revolution clutch 31. One of a pair of eccentrics is rotated and a paper engaging face 47 pushes the paper upwardly against a back-stop 37. Dust cover.-Printing is viewed through a window 57 covering the mechanism. Machine drive.-The motor driving the teleprinter is mounted at a slight angle, see Figs. 1 and 3 (not shown).