Patent GB-351698-A (GB)
Abstract: 351,698. Calculating-machines. MATHYS, A. W., 52, Chancery Lane, London.-(Monroe Calculating Machine Co. ; 555, Mitchell Street, Orange, New Jersey, U.S.A.) May 27, 1930, No. 16335. [Class 106 (i).] In a machine for dividing automatically and having a link between the power train and the carriage-shifting train normally operable at the conclusion of an additive operation only, a control member is adjustable to render the link operable at the end of any operation. The setting of the same member also causes the shifting mechanism to operate upon the release of the plus and minus keys when the machine is not in use for division. The invention is shown applied to a Monroe machine as described in Specifications 216,174 and 334,045, [both in Class 106 (i), Calculating &c.], and provides means whereby the mode of operation of the machine in division may be changed from the normal " subtractadd-shift " method to the subtractshift-add-shift method. Movement of the division lever 318 initiates division by the former method, a pawl 319 on the lever engaging an extension 207 of the clutch lever 111 to start a subtractive operation, a tooth 209 being simultaneously moved and locked in its forward position. The carriage-shifting clutch 61 is also moved into operative position. The passage of the highest numeral wheel through the zero position depresses a lever 31 to release a lever 25 which then comes in the path of a rocking arm 22 driven from the actuating shaft 4 through a link 21. A stop arm 24 is rocked to the right, an extension 145 moving the clutch lever 111 into neutral position and on the return movement of the stop-arm 24 a member 220 engages the tooth 209 and moves the clutch lever into its additive position. A lever 47 pivoted to the stop arm 24 engages a lever 52 connected by a spring 54, lever 55, cam 60, Fig. 4, and clutch 61 to a carriage-shifting shaft 46. When the shaft 4 is rotating anticlockwise at the end of an additive operation, a pin 50 on the link 21 depresses the lever 47 and so causes the shifting of the carriage, but at the end of a subtractive operation the shaft 4 is rotating clockwise and no carriage-shift occurs. To change to the second mode of operation, a plate 371 is rocked about a pivot 400 by a knob 370 a roller 53 on the plate then contacting with the end of lever 47 to hold the latter permanently against the lever 52 so that the carriage is moved whenever the direction of operation is changed. A projection 372 of the plate 371 is also brought into the path of motion of a continuously oscillating lever 158 so that the lever 371 is moved to rock a connected lever 301 which then moves into operative position a clutch 62 and a cam 59 similar to the clutch 61 and cam 60. The lever 301 is latched by a latch 340 which is released at the end of an additive or subtractive operation by the engagement therewith of the stop arm 24. The latch is also released when the carriage reaches its extreme left-hand position, by the contacting of a pin 198 on the carriage with a lever 349 connected to the latch by a link 350. The pin 198 also depresses a lever 223 to bring a rod 311 into the path of movement of a lever 313 reciprocated from the shaft 4, this lever then contacting with the division lever 318 and returning it to its inactive position.