Patent GB-478432-A (GB)
Abstract: 478,432. Calculating-apparatus. BURROUGHS ADDING MACHINE CO. July 18, 1936, No. 19984. Convention date, July 19, 1935. [Class 106 (i)] In a machine with amount differential actuator mechanism arranged to cooperate with one or more totalizers, the differential mechanism is controlled by settable members through the keys of interchangeable keyboards of the tenkey or multiple-bank type. Ten-key machine. The machine is of a general construction, Figs. 1, 2, 5 and 6, with a movable platen carriage C, upper and lower totalizers 6, 7, actuator sectors 8, co-operating type bars 3, and cam members mounted on the main operating shaft 18. The sectors 8 have a forward arm 21 pin-and-slot connected to the corresponding type bars 3 ; each type bar 3 is provided at its lower end with a receptacle 24 for settable stop pins 26 for the digits 0 to 8 and a projecting fixed stop 26a for the digit 9. These stops are set by pins 30 of a slidable and reciprocable carriage 31 during the initial part of the cycle of operation. The pins 30 are rendered effective by the depression of the keys 64 pivoted on a shaft 65 and each having an arm 67 with a lug 68 co-operating with the appropriate pin 30. The carriage on each key depression moves laterally step-bystep under the control of an escapement mechanism comprising pawls 46, 75, Fig. 5, co-operating with a rack 44 on the carriage and operated by a link 72 connected to a pivoted bail member 70 underlying projections 69 on the key levers. After the amount has been set up on the carriage, the motor bar 76, Fig. 6, is depressed to complete the motor circuit, the motor driving a worm shaft 19 and a one revolution clutch mechanism to impart a revolution to the main operating shaft 18. As this shaft starts to rotate, a cam 29 thereon reciprocates a plate 28, Fig. 3, to restore the pins 26 from their previous setting ; thereafter a cam 63, Figs. 7 and 7a, with interchangeable plates 82, 83 is operative to rock a bell-crank by the engagement of the projection 83a with a roller 61 on the crank so as to cause it to rock anticlockwise and by the engagement of a pin 57 thereon with the hooked end of a link 56 connected to the carriage frame 49 pulls the carriage rearwardly to project the pins 26 according to the set pins 30. A bar 34 extending in the direction of movement of the carriage projects the zero stop pins for denominations beyond the highest significant figure. As the roller 62 on the lower arm of the bell-crank 58 rides out of the depression 63a of the cam, the crank and carriage are returned to normal position so that a second item may then be set on the pins 30. The return movement of the carriage to its normal righthand position is effected by a cam 39 which rocks a bell-crank 41, the upper arm of which is pivoted to an arm 42 on a pivot 42b and connected at its lower end to a tape 38 secured to the carriage; when the crank 41 is rocked clockwise the upper end of the arm 42 is moved rearwardly until it strikes a stud 43, whereupon the stud acts as a pivot and the lower end of the arm 42 moves to the rear to restore the carriage. The plate 82 on the cam 63 is provided for the purpose of closing the depression 63b. To enable the same amount to be entered on successive operations, a repeat key (not shown) is depressed to raise the stud 43 out of. the range of the arm 42 so that the arm 42 moves idly and has no action on the tape 38. After the pins 26 have been set and the carriage 30 is restored, continued rotation of the shaft 18 through the action of its cam 17 and a cooperating arm 14 lowers a bail 12 so as to permit the sectors 8 and type bars 3 to take up their differential positions by the set pins 26 engaging a fixed stop plate 27. Multiple-bank machine. The keyboard, Figs. 11, 12 and 15, has a plurality of rows of keys 100 urged upwardly by an elongated coil spring 101 and each row has a detent bail 102 for latching a key in depressed position and a differential stop slide 110 carrying a pin 113 engaging the slotted arm 114 of a bell-crank, the other arm 117 of which supports a slotted bar 119 with a projection 120 for setting the carriage pins 30. The arms 117 and bars 119 are normally held in raised position by a bail 125, Fig. 16, on arms 126 secured to a shaft 116 on which is an arm 146 held by a hooked arm 143 on a shaft 142. On depression of a motor bar 133, the shaft 142 is rocked to free the arm 146 which rocks the shaft 116 until a roller 130 on a bell-crank 129, operatively connected to the shaft, engages a cam 131 on the main operating shaft. The further clockwise movement of the crank 129 lowers the bail 125 to permit the differential setting of the bars 119. In those banks of keys in which no key has been depressed, a slight movement of the bars 119 is permitted to align the projections 120 with the zero pins 30. In this form of machine the pin carriage is secured in its left-hand position, with the pins 30 aligned with the stops 26, by fixing collars on the shafts 36 along which the carriage slides ; the cam plate 63 is modified by replacing the plate 82 by a plate 150, Fig. 9. At the same time as roller 130 reaches low part of cam 131 the projection 150a meets the roller 62 of the bellcrank 58 and through the link 56 imparts a forward movement to the pin carriage causing the projections 120 to set the pins 30. After this setting and the return of the carriage, the cam projection 83a of the plate 83, Figs. 7 and 9, engages the roller 61 and rocks the bell-crank 58 to pull the link 56 rearwardly to cause the selected pins 30 to set the stops 26. The cam 131 acts to restore the bail 125 and bars 119 after about a quarter of a revolution, whereupon all depressed keys are released by operation of the bails 102 through a slide 160, bellcrank 161, and a lever 163 co-operating with a cam 164. A second item may be set up while the machine is performing the major portion of its cycle. Total-taking operation. The type bars are under the control of a totalizer during the first part of the cycle of operation. Depression of a total key 84, Fig. 6, rocks a lever 85, a downwardly extending arm of which has a stud 93 to depress the forward end of the link 56, thereby freeing the hooked end from the pin 57 of the bell-crank 58 so that the carriage reciprocating movement is suspended. Rigidly secured to the link 56 is an arm 87 so arranged that when the rear end of the link is raised the hooked end of the arm 87 will engage a stud 89 on a crank 90. This crank has two rollers 91, 92 engageable with the total-taking cam 95 and plates 96, 97, Figs. 8 and 8a. Immediately after the type bars have been set on the totalizer reaching the zero position, the cam projection 97a engages roller 91 and rocks crank 90 so that the pin carriage is moved towards the stops 26 causing the bar 34 to project those pins aligned therewith, which pins engage the fixed bar 27 and prevent further movement of the type bars after the totalizer is withdrawn. During the latter half of the operation, the bail 12 operates to restore the sectors and type bars to normal position and release of the total key restores the link 56 for amount entering operations. In the multiple bank construction, a total key 84, Fig. 16, rocks a lever 85 which is operatively connected to the shaft 142 that starts the motor and releases the latch 143, 144. When the shaft 18 begins its operation the bars 119 have been set into their zero positions and the totaltaking cam 95, which has been modified by the substitution of a plate 155, Fig. 10, for the plate 96, operates to move the pin carriage towards the bars 119 whereby the zero pins 30 are projected. After the totalizer has been zeroized and the type bars set thereby, the pin carriage is moved rearwardly so that the set zero pins project the stops 26 directly below the stationary plate 27. Specifications 265,135, [Class 106 (i)], and 380,777 are referred to.