Patent GB-359750-A (GB)
Abstract: 359,750. Calculating-machines. MONROE CALCULATING MACHINE CO., 555, Mitchell Street, Orange, New Jersey, U.S.A. Nov. 10, 1930, No. 33868. Convention date, Nov. 20, 1929. [Class 106 (i).] Multiplying and dividing machines.-The totalizing- counter carriage is shifted by connection with the motor or other drive, the movement taking place upon release of the depressed shift key. The invention is described in connection with the Monroe machine of Specifications 216,174, [Class 106 (i), Calculating &c.], and 354,956. Between the plus and minus bars is a shift key adapted when depressed to rock a shaft 125, Fig. 3, provided with an arm 129 carrying a pawl 130 normally engaged at 133, Fig. 4, with a lug 134 on an arm 135 pivoted on shaft 125. Rigid with arm 135 is another arm 137 connected by a link 140 and lever 141, Fig. 9, with a slidable bar 143 adapted to abut against one end 145 of a bell crank 146 controlling a clutch 120, 121 on the carriage-shifting spindle 105. When the shift-key is depressed therefore, the pawl 130 draws arm 135 with it and through the connections described throws the clutch into engagement. At the end of the down stroke the arm 135 is released by the pawl 130 riding over a stud 155, and consequently the connections 137, 140, &c. return to their normal positions but the clutch is retained in engaged condition by a latch 151 seizing the bell-crank 146 and only releasing it at the end of the last cycle due to displacement by the usual stop-arm 92, Fig. 8. Unlocking the machine by the shift-key. When the slide-bar 143 is moved rearwardly as described above, a push-pawl 163, Fig. 8, carried by it rocks, through member 166, a lever 71 carrying the locking-arm 72. This results in the lever 71 being temporarily latched at 88 and the raising and latching of lock-lever 75. When the shift-key is fully depressed and the slide-bar released for return, the latch 88 releases the lever 71 for return but the locklever 75 is retained by a latch 175. As lever 71 rocks back to normal, it raises latch 78 so as to free member 91 and so provide for stopping the machine. Carriage shifted when shift-key is released. When the key is allowed to return, the pawl 130, Fig. 4, being in front of hook 160, draws this back with it and therefore frees a nose 181 from a shoulder on a spring-controlled lever 183 pivoted at 184. The lever in descending will then strike an extension of the clutch lever 79, Fig. 8, to cause operation of the main shaft. As however member 91 has been freed as above described only a partial cycle of operation will occur and the arm 92 being then rocked to stop the machine will also (1) release the latch 175 from holding lock-lever 75 and (2) through a push-lever 108, pivoted on arm 92 and guided by a pin 111 on link 76, operate the parts 113, 117 and clutch 120, 121 and so shift the carriage. The clutch-operating lever 183 is also reset at this time by a link mechanism actuated by the arm 92. Plus and minus bars and shift-key. When either of the bars is depressed and shaft 62, Fig. 4, therefore rocked, a pin 179 or 193 will disable hook 16Q to prevent release of the lever 183. Minus bar; automatic division. The pin 111, Fig. 8, guides the push-lever 108 for effecting the carriage-shift only when the machine is driven for an adding-operation. If however the minus bar together with the shift-key is depressed the carriage shift may still occur, the function of guiding the push-lever being now performed by a guide surface of a lever 195. If division is to be performed automatically by the " subtractadd-shift " method it is necessary to disable this lever and for this purpose it is linked at 201 with the control lever 40.