Patent GB-146273-A (GB)
Title: Improvements in and relating to keyboard setting mechanism for adding-machines
IPC: G06C7/06
Filed: 1920-06-23
Abstract: 146,273. Optische Anstalt C. P. Goerz Akt.-Ges. Sept. 12, 1917, [Convention date]. Adding-apparatus; keyboards. - In k e y - s e t independently - operated multiple-bank machines having flexible keyboards, means is provided whereby a second key in a bank can be depressed before the value of the first key has been registered upon the totalizer. Adjacent to each key is a spindle 14, upon which are mounted three bellcrank yoke-shaped levers 13, 18, 23. The lever 13 has a depending leg to co-operate with the usual notched latch-plate 26 and a bent portion 15 engaging a notch in the key-stem. The lever 18 has a lug 19 to bear against the lever 13 and constitutes by means of its end 10 the stop device for the differential rack-bar 4. A spring 17 connected to the lever 18 tends to keep its lug 19 in contact with the lever 13. The third lever 23 has a pin 20 and also a bent-over part 29 to bear on lever 18, and under the influence of a spring 25 connecting the two levers. Upon depressing a key, its lever 13 locks with the latch-plate and so holds the levers in position for the pin 20 to be engaged drawn down and held by a hook on the detent plate 21 which is moved for this purpose at the commencement of the operation of the machine by means of a rod 27, Fig. 10, and resiliently coupled levers 28, 33. The stop 10 is now therefore in set position to transmit the value of the depressed key to the differential rack-bar. If another key in the same bank is then depressed, its lever 13 causes the unlatching of the first key and its lever 13 through the latch-plate 26, but its pin 20 meets the upper surface of the honk on the detent plate 21, and the spring 25 becomes tensioned. When therefore the detent-plate 21 is subsequently withdrawn this spring ensures the descent of the pin 20 with its lever 23 so that on the next operation of the machine the detent plate can engage the pin and consequently position the lever 18 and stop 10. When no key in a bank is depressed, a similar pair of levers 18<1>, 23<1>, Fig. 6, is drawn down by the detent-plate which now travels slightly farther than when a value key has been depressed and the stop 10<1> is thus lowered to prevent all movement of the differential rack-bar. Multiplying by repetition. - Normally, the latch-plates 26 are rocked to release the depressed keys bv the transverse movement of a slide 39, Fig. 12, acting through an inclined projection 40. The slide is moved by a rocking-bar lever 34 adapted to engage a nose 35 on a slide bar 36 provided with a claw 37 to push against a roller 38 on the slide 39. Upon depressing the repeat key 41 a lever 42 is rocked so as to raise the claw 37 out of engagement with the roller 38 to break the connexion of the operating-mechanism with the latch-plate. Differential-mechanism.-The differential rackbar 4, Fig. 8, has four projections 9 for cooperating with the stops 10 appertaining to the four lowest value keys, but the projections for keys of values 5 - - 8 are on an auxiliary bar which can slide freely on the main bar to an extent corresponding to four units. No projection is provided for the nine key, as the rackbar 4 when not prevented by a stop 10 slides to its fullest extent as determined by a slot and so registers the highest value.