Patent GB-191021842-A (GB)
Title: Improvements in and relating to Calculating Machines.
Inventor: KEIGHLEY CHARLES WILLIAM
Filed: 1910-09-20
Granted: 1911-09-20
Abstract: 21,842. Keighley, C. W. Sept. 20. Type-lever actions.-In a key-set lever-operated adding-machine the types are carried in bows 66 attached to spindles 67 mounted in a carriage 62, from which they project on either side alternately. The spindles are cranked and linked to spring-controlled levers 70, which bear against spring plungers 75 mounted in a central bar in the carriage. These plungers are engaged by rollers 76 on racks 30 adapted as described below to be set from the keyboard, the types being struck in succession as the carriage is moved across the machine. The carriage is traversed by means of a band 88 engaging sprocket-wheels on shafts on either side of the machine, one of which is bevelgeared to a pinion driven by the main crank. The pence - fractions types are mounted on a stirrup 176, Fig. 14, pivoted in a frame 178 and actuated by a cranked spindle 177 and a spring lever 183, which has a roller 185 for engagement by a projection on the type-carriage 62 at the end of its movement. The frame 178 is set by a pin 192 engaging a lever, on the other end of which engages the end of the pencefractions rack 30. The keys are pin-and-slot geared to nested sets of levers 27, the bent ends 29 of which stop racks 30, which gear with wheels 37 having weights 40 or springs to urge the racks forwards. The item indicators 60 are attached to the wheels 37 and are read through an aperture 61. Pins 48 on the key stems engage bevelled notches in sliding rods 50 so as to retract spring catches 45 from stoppins on the wheels 37. Friction catches 46 are simultaneously withdrawn from similar stoppins 42. The friction catches are only withdrawn by key action or by the lever 161 carrying the transfer-pawl by means of levers 163 and 166. By this means, wheels 37 to the left of the highest significant figure are prevented from moving from the blank to the " zero " position, so that useless ciphers are not shown or printed. The adding-wheels are carried on a shaft 112 mounted in a frame 113 rocked about a pivot 114 by a cam 118 to throw them into and out of gear with the wheels 37, the amount on the wheels 37 being transferred to the adding-wheels by the cam 127 zeroizing the wheels 37 by means of the lever 124, link 123, and yoke bar 119. After disengagement with the adding-wheels, the wheels 37 are brought to the " blank " position by a further surface 128 on the cam. The keys have bevelled projections to latch over stirrups which are withdrawn by a lever 171 and cam on the main shaft. Paper-carriages; letter-spacing mechanism; line-spacing mechanism.-The paper is mounted on rolls in a carrier, which slides on guides on the type-carrier 62 and is driven by a band 92 and sprocket - wheels, these being smaller than the sprocket-wheels 88 which drive the type-carriage so as to give the paper a relative movement for letter-spacing. Line-spacing is given by a special groove in the paper winding- on spindle 103 driving a ratchet-wheel acting on the return of the carriage to initial position. Ink-ribbon mechanism.- The ribbon 218 is carried on spools one of which is engaged by a pawl on the type-carrage, the feed taking place during the return of the carriage.