Patent GB-219923-A (GB)
Abstract: 219,923. Felt & Tarrant Manufacturing Co., (Assignees of Turck, J. A. V.). July 31, 1923, [Convention date]. Adding and subtracting apparatus; multiplying and dividing apparatus. - Relates to multiple key-bank machines for any of the four rules and consists in the provision of differential mechanism and a manuallycontrolled device whereby the differential actuators may operate direct as in a key operated machine, or function as in a key-set independently-operated machine. The invention also comprises a laterally shiftable totalizing-counter and a. revolutions-counter for registering the number of operations in one kind of drive. Keyboards; differentialmechanism.-The keys 25 are arranged in banks of nine keys and are provided with stems 26 which bear upon a corresponding differential actuating member 29, 30 and co-operate with the usual spring restoring devices 28 as de scribed in Specifications 13094/04, 26772/12, and 16036/13. The differential member 29, 30 is pivoted at 31 and the arm 29 carries a link 35<b> connected to an arm 35<a> pivotally mounted on a fixed shaft 32 on which is also mounted a totalizer actuating sector 33 that is flexibly connected to an abutment on the arm 35<a> by means of a spring 37 as more fully described in Specification 219,936. To the forward arm of the sector 33 is pivoted an abutment lever 105 the abutments 109 of which are at progressively different distances from the keystems and co-operate with the stems to limit the movement of the sector 33 in accordance with the value of the key depressed. Each differential member is provided with a dual flexible link mechanism which serves to restore the member to normal in key-operated machines and provides a yielding connection between the differential member and main actuator in key-set machines. The dual link mechanism comprises upper and lower mechanisms 42, 43 disposed on opposite sides of the pivot 31 and main actuator shaft 40 and each is constituted by a spring 44 and a ram 46; the spring is attached at one end to the differential member and at the other end to the head 47 of the ram which head is slotted to engage a pin 49 on a corresponding plate 41. In key-operated machines the plates 41 are held stationary but are oscillated in key-set machines by means of an arm keyed to the shaft. 40 and connected by a pitman to a crank arm or eccentric on the shaft 57 of the main operating crank 56. The rotation of the crank 56 is arrested at the end of each revolution by means of a notched disc 61, Fig. 9, on the end of the shaft 57 co-operating with a roller 64 on a spring-controlled arm 63. keyboard interlocks.-Actuation of the differential members by the main actuator in indedendently operated machines is prevented by means of latches 67 that are pivoted to a bar 66, Fig. 10 and have notches 69 adapted to be projected beneath the arms 29 of the differential members. Each latch is Controlled by a pin 74 on the depending arm 73 of a corresponding control bar 70 loosely supported on front and rear rods. Each bar 70 has a depending arm 75 with a slot 76 which receives a grooved portion of a shift rod 78 controlled as to its lateral position by a pivoted arm 79, Fig. 9, which is provided with a roller 82 co-operating with notches 89, 90 in the stem of a control key 83<1> designated " key drive." A notch 84 in the stem of this key receives one arm of a pivoted beam 85 the other arm of which engages a similar notch in the stem 88 of a second control key designated " crank drive. " Locking of the crank 56 is ensured when the key 83<1> is depressed by the end of the shift rod 78 entering a notch or hole in the notched disc 61. Each bar 70 is provided with nine depending lugs 92 which co-operate with notches in the numeral key stems whereby on the depression of a key the latches 67 are rocked to release the corresponding differential member and to retain the key in depressed position. Error keys and the like.-Each bar 70 is provided at its front end with a shoulder 99 on which rests the stem of a small column release key 101 the depression of which rocks the bar 70 to restore the depressed numeral key. All the depressed keys may be restored by depressing the " key drive " control key 83<1> or by depressing a"clear" key 98 the stem of which is notched to receive a roller 96 on a pivoted arm 95 the upper end thereof being slotted to engage one of the grooves of the shift rod 78. Totalizing-counters.-The totalizer is mounted in a carriage that is pivotally and slidably supported on a rod 120 and is held in its several denominational positions by a locking arm 123 adapted to engage one or other of a series of notches in a bed plate 121. The return movement of the sectors 33 is operative to effect the transmission of the setting to a pinion 111 associated with a ratchet wheel 112, lantern pinion 113, and gear wheel 114, the wheel 114 gearing with intermediate mechanism connected to the pinions 127 of the totalizer. The intermediate mechanism preferably comprises transfer-mechanism of the . type described in Specification 219,938. The carriage is also provided with a revolutions-counter comprising numeral wheels 168 having two ratchet wheels 171, 172 of which the wheel 172 co-operates with a pawl for preventing backward rotation of the wheels. The numeral wheels 168 are advanced by means of a pawl 178 actuating the ratchet wheel and operated by a bell-crank lever 177 in the units denomination rocked by a cam 181 on the main shaft 40. The resetting to zero of the numeral wheels of the totalizing-counter and revolutionscounter is preferably effected by the means described in Specification 219,937.