Patent GB-217203-A (GB)
Title: Improvements in and relating to printing mechanism for calculating machines
IPC: G06C11/00
Filed: 1924-05-26
Abstract: 217,203. Lindstr÷m Akt.-Ges., C. June 7, 1923, [Convention date]. Adding and subtracting apparatus with printing mechanism; printing totals and sub-totals. - In machines particularly of the Thomas type the printing of the totals and sub-totals in addition to that of the items set by the keys is permitted by the provision of an intermediate totalizing-counter mechanism adapted to control the position of notched segments which serve to limit the travel of the type. setting devices. The depression of a key 2, Fig. 1, in any bank rocks a corresponding lever 4 to set a pinion 7 with respect to a stepped barrel 9 the rotation of which in the usual manner transmits the value of the keys depressed to a main totalizing-counter mechanism 13. At the same time a roller 48 on an arm 6 of the lever 4 rolls on a cam surface 47 of a lever 42 and rocks. the said lever about its pivot 34 so as to set the notched segment 43 on the rear end thereof. Movement of the operating crank or lever 58 moves a cross-bar 59 and springs 60 control the type-setting segments 45 until the pin 61 thereon is arrested by the segment 43. Toward the end of the operation the type wheels 44 are rocked by a rod 62 against a platen 63. To print totals and eub-totals the position of the notched segments 43 are controlled by an intermediate totalizing-counter mechanism 18 actuated by one or other of a pair of bevel wheels 14, 15 mounted on the shaft of the pinion 7. The mechanism 18 is mounted on a frame 17 carried by arms pivoted at 30 and each denominational pinion is provided with a cam or stepped disc 19 with each of which is adapted to co-operate a spring-controlled plunger 21. The plungers are moved to engage the stepped discs 19 by means of corresponding spring-controlled rods 38 guided in frames 36 mounted on bell-crank levers 35 fixed to the shaft 34 and connected by a link 33 to a total-taking lever 32. The guide rods 38 have pins 41 which engage the levers 42 to set the notched segments 43 in accordance with the position of the stepped discs. The main and intermediate totalizing-counters may be reset to zero by mechanism operated by one and the same lever. The mechanism shown, Figs. 1 and 2, for zeroizing the totalizing-counter 18 comprises a slide 31 mounted on the frame 17 and having a projecting pin 28 engaging a slotted cam plate 29 so arranged that when a zeroizing lever 25 is operated the frame 17 is rocked by means of a link 24 to release the totalizing-counter from the bevel wheels 14, 15 and the slide 31 is moved for the purpose of returning the wheels to the zero position by known means. The results of a multiplication and division may be printed as above described: to print the factors as such the multiplier keys 52 are provided which are mounted on key-bars 50 each of which is under the control of a spring 53 and retaining pawls 54. Each key-bar 50 has a guide surface 51 adapted to engage a roller 49 on an arm 46 of the lever 42 carrying the notched segments, and has a rack 56 co-operating with numeral discs 57. A common adjusting device may also be provided to effect the change from addition to subtraction or multiplication to division in both totalizing- counters.