GB190614680A - Improvements in Adding Machines. - Google Patents

Abstract

14,680. Roth, G. June 27. Calculating-apparatus.-In a singlebank key-set key - operated adding- machine, mechanism for the following purposes is described : (1) differential setting and actuation, (2) preventing overthrow of master setting- wheel, (3) key full-stroke, and (4) lateral spacing. (1) The key levers 66 are pivoted on a bar 17 and are pressed upwards against the casing 25 by springs 20. The free end of each lever is provided with a spur 23, each of different length according to the value of the key lever. A lever 19 pivoted at 17 ends in a segmental rack 10 in mesh with a wheel 11 keyed on the shaft 13, on which is loosely mounted the master setting-wheel 14. To ensure that only the downward movements of the rack 10 are transmitted to the wheel 14, a pawl-andratchet connexion 22, 12 is provided. The lever 19 carries a universal bar 44 which is operated by all the key levers. The downward movement of the key levers is arrested by a cross-bar 27 carried by a lever 24 pivoted at 78. (2) When a key lever has completed its downward movement, its pressure on the bar 27 raises the detent 26 to arrest the master setting-wheel. A brake 29 is constantly pressed on the hub 79 of the wheel 14 by a spring 31 acting through a lever 30. (3) To prevent the return of a key lever until pressed rigbt down, the bar 44 rocks the angle-lever 45, 46, bringing a pawl 49 on an arm 45 into engagement with a toothed lever 51, the other end of which engages by a pin-and slot connexion with the lever 24. This prevents the lever 45 from returning until the bar 27 is pressed by the spur 23. At the same time, the segment 10 is prevented from returning by a pawl 47 which engages with the rack on the arm 46. The key lever is prevented from returning by a pawl 48 which is attached to the arm 46 and engages with a tooth 41 on the spur 23. The pawl 48 extends the whole width of the keys and has a slot in it to allow the lever 19 to be depressed. (4) A hand-operated disk 72, Fig. 4, carries one or more spiral cams 73 which engage with notches 76, such as are described in Specification No. 25,882, A.D. 1905, in the carriage 21 of the totalizing-counter, by which a half-revolution of the disk moves the counter one space.