GB620175A - Improvements in or relating to calculating, accounting and similar machines - Google Patents

Abstract

620,175. Calculating-apparatus. NILSSON, R. S. Nov. 7, 1946, No. 33103. [Class 106 (i)] The carriage of a calculating machine is moved step-by-step in one direction under the action of a spring and returned to its initial position by a second spring. A bracket 9 contains number of rollers 10, one under each key 3, so that when a key is depressed its end engages the corresponding roller and moves the bracket rearwards. This, via a connection 13, depresses a bell-crank lever 12 which releases a comb 1a and allows the carriage 4 to move one step to the left under the influence of a spring 37. One end of the spring is fixed at 38 and the other fastened to a pin 39 on the end of a bell-crank lever 40, the pin bearing against the end 43 of an operating bar 33, which is connected via a pin-and-slot arrangement 30, 31, a lever 27 and a link 28 to the carriage. At the end of the setting operation the main shaft 5 is rotated anticlockwise (Fig. 1) moving cams 16 and allowing type sectors 6 to be moved by springs 17. The noses 23 of the sectors move down until they abut the displaced setting elements (not shown), and a sector stop latch 24 engages a slot in a rack 25 to prevent the carriage returning. At the same time a release arm 44 is swung upwards and a pin 45 on it lifts a sector 47 which turns a bell-crank lever 41 and moves the pin 39 away from the end 43 to engage a shoulder 53 on a locking lever 52 which is urged upwardly by a spring 54. The spring 37 and a spring 50 connected between the pin 39 and a pin 51 on the operating bar 33 are thus tensioned. Subsequent clockwise rotation of the main shaft transfers the reading to the totalizer wheels, and the cams 16 and 19 return the type sectors 6. When the noses 23 are all clear of the carriage setting face 4a a balance weight 26 lifts the latch 24 and the carriage is returned to its initial position by the spring 50 which pulls the bar 33 rearward. Clockwise rotation of the main shaft also swings the arm 44 downwards and this depresses the locking lever 52 allowing the spring 37 to pull the pin 39 against the end 43 of the bar 33. Instead of employing the arm 44 to release the locking lever, the bar 33 may have a pin at its rear end which rides on a cammed surface of the locking lever to depress it.