Patent GB-225253-A (GB)
Abstract: 225,253. Muldivo Calculating Machine Co., Ltd., and Hallahan, F. E. May 30, 1923. Multiplying and dividing apparatus of cam-disc and pin-wheel type. When division is being performed and an extra turn of the crank is given in any one denominational position of the counter carriage, the shifting of the highest transfer arm thus caused automatically reverses the drive between the crank and the barrel shaft to nullify the extra turn. The carriage is also unlocked and on the completion of the correcting turn may be automatically shifted one step. The drive from the crank shaft 1 to, the barrel shaft 2 takes place through a pinion 3, crown wheels 4, 5 arranged back to back on a transverse shaft and a pair of pinions 6, 6<a> slidable on the squared shaft 2 and controlled in position by a guided bracket 12. A cam 14 fixed on shaft 1 has alternative tracks for a follower 15 mounted on a lever 16 bifurcated to embrace a pin 17<a> on a lever 17 connected by a link 18 with the bracket 12. The follower normally occupies the right-hand track under the influence of a spring 15<a>, but when the transfer arm 19 corresponding to the highest denomination on the totalizer is operated, owing to an over turn of the crank, a pin 20 on the arm co-operating with a wing plate 21 rocks a shaft 22 and through a link 24, a lever 25 a wedge 25<a> on which shifts the lever 16 counter-clockwise to bring the follower into the left-hand track. The continued rotation of the crank shaft thereupon produces the shifting of bracket 12 to the right and the drive is reversed. At the end of one turn in this reverse direction a pin on the barrel rocks a detent 27 to release the shaft 22 and the spring 15<a> can thereupon return the lever 16 to its right-hand position to restore the drive to normal condition. To provide lost motion at the beginning or end of a rotation of the crank the gear wheels 5, 6, 6<a> are mutilated and means are provided to ensure re-engagement of the teeth at the end of the lost motion. The starting position of the crank shaft is determined by a pair of spring-controlled levers 28, 29 mounted on a bracket 30 and having their ends shaped to engage and stop a pin 14<a> on the crank shaft disc 14. A similar function is performed in the case of the barrel by a pair of bolts 38 slidable on stud 36 and maintained in the position shown by a spring 38 connecting two pivoted arms 37 bearing on a pivoted guide-way 33<a> for the bolts. A lug 34 on a disc 35 fixed on the barrel shaft 2 pushes back one of the bolts and lodges against the other. The barrel is freed at the first motion of the crank by an arm 32 attached to a shaft 31 and bearing against pins on the bolts. This shaft is rocked by the thrusting rearwardly of the bracket 30 by the pin 14<a>, the bracket being secured to the shaft. Selecting denomination.-The bracket 12 carries a vertically-slidable bolt 39 retained in its upper and inoperative position, Fig. 11, against spring action, by a rail 40 along which a lug 39<a> on the bolt can slide. When the bracket is moved to the right to reverse the drive, a notch 40<a> in the rail allows the bolt to descend into engagement with the teeth of a comb 41 connected to the carriage. The bolt also rocks a pivoted plate 43 and so, through lug 43<a>, rock-shaft 44 and arm 44<b>, raises the retaining latch 45 of the carriage. Owing to the interposition of a bridge portion 46<a> formed on a spring-controlled lever 46, the bolt 39 does not drop into the notch 40<a> until it has traversed the bridge. When the bracket is returned to normal position, however, the bolt passes under the bridge before rising and being still in engagement with the comb shifts the carriage one step to the left.