Patent GB-576310-A (GB)
Title: Improvements in or relating to photographic type-composing apparatus
IPC: B41B15/02
Filed: 1943-08-19
Abstract: 576,310. Photographic type-composing machines. INTERNATIONAL BUSINESS MACHINES CORPORATION. Aug. 19, 1943, No. 13529. Convention date, Sept. 16, 1942. [Class 98 (i)] In a type-composing machine in which a line of transilluminable characters is set up for inspection by operation of a keyboard and then photographically recorded after necessary correction, the characters are set up on a number of units positioned side by side, each unit including means to set up any one of an entire set of characters from which the record may be composed, the units being set by setting means mounted on a carriage which escapes from one unit to the next as the keys are operated. As shown in Fig. 14, each unit comprises an opaque character slide 31 bearing transparent characters and six superimposed apertured shutter slides 32a-f normally preventing illumination of any character, but displaceable one or more at a time to illuminate at each setting a single character only. With displacement of slides c-f no character is illuminated. The character slide 31 is displaceable to change to upper case. Prisms of different angle are arranged above each pair of characters (lower and upper case) to bring all the images projected by the lamp 18 and reflector 17, Fig. 2. into the same line on screen 15. The composed line projected on screen 15 is viewed by means of the prism 22 in the verifying window 21. The camera 20 has a lens and shutter assembly 160 with a shutter trigger 161. Perforated film is fed from the spool 164 through exposure gate 191 to take-up spool 170 by sprockets driven by pawl-andratchet gear, the spool 170 being belt-driven from a sprocket shaft. A normally inoperative winding knob may be engaged with one sprocket shaft. The shutter trigger is actuated by a solenoid through a spring-restored member 'which, when released, operates a pawl to feed the film a line space. A lever 184 contacting the film roll opens contacts 185 when the film is exhausted, and the film if then wound on to the take-up spool by the winding knob. A normally raised, vertically movable shutter 23 is lowered on energization of a solenoid and closes contacts energizing the shutter operating solenoid. Completion of movement of the shutter operating member closes contacts energizing the carriage return solenoid and a solenoid releasing a detent for the bail of the recording key. The carriage 14, Fig. 3, is movable on rollers 51, 52 on frame 11 and carries at the level of the character slides seven interposer slides 53 having rear tongues 56 coacting with the related character or shutter slide and front tongues coacting with spring- biassed actuating levers having associated cams 68 co-operating with a constantly running roller 70, but normally held inoperative by the detent 71a on a spring-biassed bell-crank lever 71 connected to the armature of a solenoid 80. The seven solenoids are connected to wipers 120a-f and 120uc and to a common wiper 121 riding on contact bars 122. The key levers 125 having appropriate combinations of lugs 125x actuate the corresponding combination of bails 130a -i, Fig. 4, bails 130a-f being associated with shutter slides 32a-f. The space bar 133 has lugs 125x operating bails 130c-f, thus producing a blank setting but operating the escapement mechanism. The bail 130g is associated with the character slide 31 and is operated by one of the two case shift keys. The bail 130i is operated by the recording key and controls the circuit of the solenoid operating shutter 23. Energization of any solenoid 80 releases the detent 71a from lug 68a of cam 68 and places the detent 71b in the path of a second lug 68b. On release of the cam 68, a spring-urged lever 72 turns the cam far enough to contact with roller 70. The corresponding actuating lever is rocked to throw the interposer slide to the rear to set the corresponding shutter or character slide. The movement of cam 68, after leaving. roller 70, is completed by lever 72 and the lug 68b is brought successively against detents 71b and 71a. Operation of any of the actuating levers (except that corresponding to the character slide) moves the bar 109 to operate the carriage escapement mechanism to shift the carriage by one step. Energization of the carriage return solenoid trips a cam against roller 70 to close the clutch of a spool 216 carrying a tape 218 connected to the carriage, the clutch being released at the end of the return movement. Operation of the back-spacing key energizes solenoid 226 to trip cam 225 against roller 70 to operate rack mechanism moving the carriage back one space.