Patent GB-191515573-A (GB)
Title: Improvements in and relating to Calculating Machines.
IPC: G06C25/00
Filed: 1915-11-04
Abstract: 15,573. Marks, E. C. R., [Addometer Corporation]. Nov. 4. A d d i n g - a p p a r a t u s ; printing totals and subtotals ; adjusting for recording only; interlocking; t o t a l i z i n g-counters. - In machines having special keys such as total, sub-total, or non-add keys, means are provided for preventing the repetition of the corresponding operation or abnormal action of the machine upon subsequent movement of the main operating-member while the key is held depressed ; also for restoring the parts to normal positions after an operation due to one of the special keys. A pitman 2, supported from a side plate 1 by cranks 3, 4 by which it is oscillated forward and back at each operation of the prime-mover, is notched to form shoulders 5, 6 to engage a lug 18 on a bar 17, which is hinged to a rocker 11 pivoted at 12. The rocker 11 carries the totalizing-counter pinions 13, which are normally in gear with transfer segments 14, but may also engage the racks 15, the rocker being held in either position by a spring detent 16. The bar 17 is drawn upwards by a spring 19 attached to an arm 20 pivoted to the bar and forming an extension of the non-add key 21. In the normal operation of the machine, the pitman 2 moves the bar 17 by means of the shoulder 5, so that the pinions 13 engage the racks 15 after these have risen, the shoulder 6 at the end of the backward movement of the pitman separating the racks and pinions after descent of the racks. Depression of the key 21 swings the bar 17 clear of the shoulders 5, 6, but a stud 23 on the pitman strikes the arm 20, removing it from below the key 21, so that even if the key 21 is held down, normal operation ensues. The total key 24, Figs. 1 and 5, is formed with an arm 25 having a shoulder 26 to engage a stud 49, by means of which the bar 17 may be depressed ; this stud is carried by a arm 47 hinged to a lever 45, and also connected to the forward end of the lever by a spring 48. Depression of the key 24 rocks the lever 45 to cause the arm 50 to abut against a stud 51 on the bar 17 and draw it forward so as to engage the pinions 13 and racks 15. The pitman then moves forward near the end of its stroke, pushes the stud 49 from between the shoulder 26 and bar 17, so that the bar 17 can rise, but not completely,' owing to its end striking an arm 27 pivoted on the key 24. The shoulder 8 of a spring latch 7 on the pitman also engages a pin 53 on the bar 17, so that on return movement of the pitman, the bar is drawn back to disengage the rack and pinions. The sub-total key 28 is formed with an arm 29 also bearing on the stud 49, and the action which occurs is similar to that taking place when the total key is depressed, except that, when the stud 49 is pushed from between the arm 29 and bar 17, the bar 17 is free to rise clear of the latch 7, and the racks and pinions are therefore only disengaged by the shoulder 6 at the end of the oscillation of the pitman. The keys are locked in the depressed position during operation by one of the pins 35, 36, 37 entering the corresponding slot 32, 33, 34 in a sliding bar 31. When a key is depressed, this bar is thereby shifted and is held so by a hook 40 on a lever 39 being drawn into a recess 42 by a spring 41. A swinging latch 43 on the lever 39 co-operates with a stud 44 on the pitman to rock the lever 39 and allow the bar 31 to be retracted by a spring 38 at the end of the operation. The customary provision is made for releasing the the rack-bar and type-plate holding devices upon a total or sub-total operation, such devices being of the kind described in Specification 17,946/14.