Patent GB-147835-A (GB)
Title: Improvements in or relating to calculating machines
IPC: G06C11/02
Filed: 1920-07-09
Abstract: 147,835. Grimme, Natalis, & Co. Jan. 13, 1919, [Convention date]. Multiplying and dividing apparatus; transfer mechanism.-In a machine of the pin-wheel and camdisk type with a laterally-slidable totauzing-counter carriage for calculations according to the four rules, in which the revolutions-counting mechanism is in the main casing and. does not move laterally, means are automatically provided for (1) moving the reading-aperture shutter of the revolutions-counting mechanism according to whether a reading from the positive or the negative (complementary figures) is required, and (2) accounting for the '' fugitive one " as the revolutions-counting mechanism passes through zero reading. On the driving shaft 1 are mounted operating-disks carrying shifting pins and the necessary return cams for each denomination, each disk being associated with a shifting lever and counting-wheel. On a shaft 15 is slidably keyed a sleeve 16 carrying main and auxiliary cams 36, 17. The totalizing- counter is rigidly fixed to a rack 9 by an arm 45, said rack meshing with a pinion 10 fixed to the base-plate. A moving rack 11, which gears with the pinion 10, carries a bell-crank lever 13 one end of which has a vertical pin 29 and the other a fork 14 for moving the cam-sleeve. A yoke 28 pivoted at the bottom, and operated by the pushbar 27, swings the pin 29 and by means of a pin 30 on its other end frees the pawl 31, pivoted to the frame, thus locking the yoke in the deflected position. In zeroizing the revolutions counting-mechanism by rotating the shaft 24, the bar 27 is pushed in the direction of the arrow y (Fig. 4) by a notch 26 on the cam disk 25 mounted on the shaft 24, thus swinging the yoke clockwise (Fig. 2), rotating the bell-crank lever 13 in the direction x (Fig. 3) by means of the pin 29, and putting the auxiliary cam 17 into action. The reading aperture slide is rotated into position for a multiplication calculation by means of the V- lever 32, and the shifting-lever 7 is pressed into the operative position by means of a pin 40 fixed to the bar. On now rotating the shaft 1 in an addition or multiplication direction, the following sequence of operations takes place. The return cam 22 puts the lever 7 into the inoperative position, the shifting pin 6 passes the heel of the lever 7 without acting, the cam 17 is put out of action, and the cam 36 is put into action by the cam 43, releasing the yoke; the cam 36 re-sets the lever 7 in the operative position, and the pin 5, through the wheel 3 turns the counting wheel 4. Upon a negative rotation of the shaft 1 the following is the sequence. A deflecting stop 37 meeting the lever 7 in the operating position, is deflected and strikes the two-armed lever 39, which puts the slide in the negative position. A second pin 41 is deflected by the lever 7, and turns the wheels 3, 4, initiating a positive transfer throughout the whole counter. The return cam 21 presses the lever 7 into the inoperative position, the pin 5 passing the heel of the lever 7 without action, and the cam 43 presses the pawl 31 and the yoke 28 to act so that the cam 36 returns the lever 7 into the operative position. The tooth 6 is deflected by the heel of the lever 7, and turns the counting-wheel 4, and the return cam 22 puts the lever 7 out of action. If the first negative rotation after the zeroizing is for any other than the units denomination, the auxiliary cam 17 presses the corresponding shifting-lever into its working position.