Patent GB-542516-A (GB)
Abstract: 542,516. Calculating apparatus. MONROE CALCULATING MACHINE CO. Sept. 12, 1940, No. 14149. Convention date, Sept. 30, 1939. [Class 106 (i)] In a machine for effecting multiplication by repeated addition the multiplier is set up on wheels adapted to control the sequence of operation either directly through the differential actuators or through devices in which a constant multiplier has been stored. The invention is shown applied to a machine as described in Specification 509,747 and according to the present arrangement the storing devices are constituted by intermediate transmission gears movable into and out of mesh with the multiplier control gears and clearing means is provided to zeroize the storing gears while out of engagement with the control gears. In the known manner the multiplier, set on the keyboard 18, Fig. 1, is entered on the actuators 6 and transmitted thereby, on rotation of the shaft 7 through intermediate gearing 376, 377, to the multiplier control wheel 3 ; the multiplicand is then set up and entered on the actuators 5 and the shaft 4 is repeatedly rotated under control of the wheels 3 to transmit the products to the totalizer 13. As the control wheels 3 return successively to zero position a control means as described in the above-mentioned Specification serves to interrupt the drive to the shaft 4, to shift the totalizer carriage, and to resume operation in the next higher denomination. If a value is to be retained as a constant multiplier the amount is first entered in the control wheels 3 through the intermediate gears 376, 377, these gears are then shifted out of mesh, cleared to zero and then shifted back into mesh before the multiplying operation is commenced. Thus as the control wheels step back to zero the values are transmitted to the gears 377. To set a stored multiplier into the control wheels the gears 377 are reset to zero while in mesh with the wheels. The intermediate gears are loosely mounted on shafts 9, 384 in a laterally movable frame and each gear 377 is formed with a zero tooth 426, Fig. 4 to co-operate with a toothed slide 417 splined to the shaft 384 when the latter is rotated. The multiplier setting and constant storage operations are controlled by one-revolution clutches 26, 407, Fig. 7, on shafts 430, 432 driven by gearing from an electric motor and connected to the shafts 7 and 384 respectively. The clutch pawls 25 are normally held by the action of detents 381, 406 in co-operation with a rocker 379 pivotally mounted on a slidable plate 378. Adjustment of the rocker 379 for operation of one or other clutch is effected by a link 404 yieldingly connected to a lever 401 in operative relation with a hand lever 300. To operate the selected clutch the plate 378 is raised by means of a lever 15, link 14 and lever 12 operatively connected to the operation key 1 depression of which also closes motor circuit contacts 99. As the plate 378 reaches its upper position pins thereon displace the rocker 379 to its central position thereby releasing the detent to free the clutch. With the hand lever 300 located in its forward position, Fig. 7, depression of operation key 1 will operate clutch 26 to set the multiplier control wheels 3 from the actuators 6. To set up a constant multiplier a hand lever 410 must be moved rearwardly. This operation serves (1) to throw the lever 300 into its rear position to select the clutch 407, (2) to displace a link 411 to rock a shaft 413 whereby a cam 414 thereon rocks a bifurcated lever 415, Fig. 4, to displace the laterally movable frame and disengage the intermediate gears 377 from the control wheels 3, and (3) to rock a lever 419 through a link 418 to rock the lever 12 and operate the clutch rocker 379. The shaft 384 is thereby rotated through one revolution to zeroize the intermediate gears. Release of the lever 410 returns the gears to engaging position but leaves the lever 300 in its rear position for adjustment as necessary. The usual bail 74 which engages notches in cams 68 in the normal position is raised during the setting operations by rocker arms 435, Fig. 5, on the bail shaft 73 engaging notched plates on the shafts 430, 431. A lock is provided to co-operate with the bail to prevent operation of the key 1 or lever 410 so long as a value remains set on the wheels 3.