Patent GB-363470-A (GB)
Abstract: 363,470. Calculating-apparatus. MARCHANT CALCULATING MACHINE CO., Oakland, California, U.S.A.-(Assignees of Ayery, H. T. ; 3400, Richmond Boulevard, and Lerch, G. ; 478, Moss Avenue, both in Oakland, California, U.S.A.) Nov. 5, 1930, No. 33289. Convention date, Nov. 6, 1929. [Class 106 (i).] Multiplying and dividing apparatus.-A powerdriven machine with a laterally movable totalizing- counter carriage such as described in Specification 229,642, [Class 106 (i), Calculating &c.], is provided with means for shifting the carriage automatically during multiplication and division operations the direction of movement of the carriage being predetermined under the control of the operator. Means are also described for signalling when the capacity of the totalizer is exceeded the operating mechanism therefor being under the control of the usual division control mechanism. The Specification also describes a releasing means for the multiplier keys, an arrangement of special keys, and interlocking mechanism between the keyboard and the various clutches of the operating mechanism. In the machine shown the motordrive and clutch mechanism 112, Fig. 1, the reversing mechanism 130 .. 134, Fig. 3, for the rotary differential actuators and the positive and negative rotation control keys 200, 220, Fig. 1, are similar to those described in Specifications 305,540, [Class 106 (i), Calculating &c.], 342,044. An add key and 250, Fig. 10, for ensuring release of the depressed keys at the end of each cycle of operation is also provided. Carriage shift mechanism. This mechanism which is similar to that described in Specification 212,207, [Class 106 (i), Calculating &c.], comprises a pivoted plate 502, Fig. 5, with a notch engaging a pin 504 movable laterally to engage the shift pawls. Movement is imparted to the plate 502 through a pin 553 thereon abutting spring-controlled arms 555 pivotally mounted on a slidable link 550 provided at the opposite end with notches 560, 5601, co-operating with peripheral cams 561, 5611 on carriage shift clutches 562, 5621 serving to slide the link in one or other direction respectively. These clutches, which are similar in type to the main clutch, can be controlled manually by keys 570, 5701, the right-hand key 5701 being operated to permit the carriage to move into a lower denominational position. The key 5701 is mounted on a lever provided with a pin 5691, Fig. 6, adapted to operate the clutch control lever 5661. In order to control the engagement of one or other of these clutches automatically during a multiplication or division operation a tripping finger or cam 580, Figs. 3 and 7, mounted on the shaft 581 carrying the transfer pin drums for the revolutions or quotients counter, is operative in the additive direction of rotation to depress a slide 582 carrying a pin 593 adapted to engage the tail 574, 5741, Figs. 18 and 19, of one or other of the control levers. The selection is effected by interposing the head 5764 of a member 576 between the pin 593 and one or other tail 574, 5741. The member 576 is pivoted to a strap 5762 journalled on a shaft 5763 and is adjustable in a horizontal direction by contact of a projection 5765 thereon with a manually operable lever 577 movable between stops 5772. The slide 582 is normally ineffective and is moved to its operative position by a depending lever 596, Fig. 7, on a control shaft 595 operated at appropriate times during a cycle. The slide is retained in active position by a latch 585 until the shift clutch is actuated whereupon a cam 590 on the corresponding clutch rocks the latch to force the slide to ineffective position. Engaging carriage-shift clutch automatically. In performing division operations the machine operates automatically by the provision of mechanism similar to that described in Specifications 305,540, and 342,044, the division control member 630, Fig. 5, is modified however as hereinafter described. The usual division slide 610 is utilized to move the interposing member 576 over the tail 5741 of the clutch lever 5661. The slide 610 is provided with a cam part 612, Fig. 12, which on movement displaces a shaft 615 to move a fork member 616, Fig. 5, into position to engage the restart clutches 617. This fork 616 is provided with a depending arm 6161, Fig. 18, engaging an upstanding arm 5767 on the member 576 to move it to the right over the tail 5741. The engagement of the clutch is effected by a pivoted lever 670, Fig. 5, with a projection 672 overlying the usual main clutchcontrol link 121 and with a nose overlying the division slide locking pawl 605 and the end 674 of a lever 673, Fig. 10, fixed to the control shaft 595 which is thereby rocked to engage the clutch when the link 121 is raised to arrest the main differential actuators. Towards the end of the shift cycle a cam 680 on the clutch 5621, Fig. 5, rocks an arm 681, Fig. 18, on a shaft 682 and through the clutch 617 rocks this shaft permitting an arm 683, Fig. 1, thereon to rock the main clutch lever 115 effecting its re-engagement. In multiplication operations the main clutch is released at the end of a selected predetermined numbers of rotations by a trip slide 700, Fig. 10, acting in a manner similar to that described in Specification 229,642. When this action has been effected a member 760 pivoted to the slide 700 by engagement with the end 762 of an arm 763 on the control shaft 595 rocks this shaft to move the trip slide 582 to operative position the slide being then depressed by the cam 580 to engage the shift clutch 562. Movement of the carriage shift slide 550 is utilized to release the depressed multiplier key. For this purpose a pair of lugs on the slide 550 act upon a release lever co-operating with the key-latching slide. Division operation control and capacity signal. The control lever 630, Figs. 13 and 17, is pivoted to the frame at 631 for movement in a vertical plane by action of a transfer lever 425 of known kind and to the lever 630 is pivoted for movement in a horizontal plane a bifurcated member 633 under the control of a lever 650 co-operating with the division slide in known manner. The operation of the lever 630 is timed to take place before the differential actuator reaches full cycle position, for which purpose the lever has a T-shaped end adapted to co-operate with the transfer levers 425 of the last three denominations. The highest order lever has a lug 4251 enabling it to rock the lever 630 but the other levers are only enabled to rock the lever by the interposition of a member 6301 pivoted to the lever 630 and controlled by the member 633 engaging a notch therein during division operations. In addition, subtraction, and multiplication operations the bifurcated member 633 is free of the " overdraft " control lever 634 and overlies the upper end of a link 454, Figs. 3 and 13, provided with a shoulder engaging a slotted lug on a clapper arm 451 of a bell 450A. When the capacity of the totalizing-counter is exceeded rocking of the member 633 by the pawl 425 rings the bell 450. The last three denominations are merely transfer arrangements and when the lowest order of these denominations is opposite the member 630 a projection 455 thereon actuates the member 633 and causes the alarm to be sounded. Operating-mechanism controls and interlocks. The means for terminating the operation automatically when the carriage reaches its home position or manually at the end of a particular series of cycles or at the end of any one cycle is of known construction. The " add " key 250, Fig. 10, depressed during adding and subtracting operations is used to disable the shift clutch control by means of a link 259 attached to the kev lever 252 and connected to the member 760 so as to raise said member free of the lever 763 when the kev is depressed thus preventing rocking of the clutchcontrol shaft 595. The member 760 when raised rocks a bell crank 675 the upper arm of which displaces the nose 674, slidably mounted on the lever 763, from engagement with the lever 670 that is operated by the main clutch-control link 121. The member 760 is provided with a hooked front end 7364 which on depression of the " add " key engages a pin 7363 on the multiplier key bank latching slide for the purpose of effecting release of said keys during the calculation of problems involving repeated addition. A " non-shift" key 770, Fig. 10, co-operates with the front end of the lever 760 and on depression disables the carriage shift control and connects up the key-releasing mechanism during multiplication operations. The electric circuit to the motor is controlled in a known manner by spring contacts 800, Fig. 1, associated with means co-operating with the main-clutch lever 115 and with the various clutch controls on the shaft 820, Fig. 8. When this shaft is operated by any one of the controls an arm 815 thereon is rocked to block oscillation of the shaft 807 to prevent operation of the main clutch lever 115. Similarly when the lever 115 is operated movement of the arm 815 is prevented an interlock being thus provided between the clear keys 450. 475, the shift keys 570, 5701, and the main clutch. An interlock to prevent engagement of the main clutch when either of the shift clutches is functioning comprises an arm 860 pivotally mounted on the latch 585 which on the operation of the clutch is depressed by the cam to cause a lug 863 on the arm 860 to engage a pin on the arm 815 to lock it in position. A plate 865, Fig. 12, on the main division slide 610 disables the lock during division operations. An interlock between the two shift clutches is provided by a pivoted plate member 870 having shoulders co-operating with the tails 574, 5741 of the clutch control levers. The clear keys 450, 475, Fig. 9, which reset the registers as described in Specification 272,174, [Class 106 (i), Calculating &c.], and the shift keys 570, 5701 are interlocked by means of a pivoted