Patent GB-317092-A (GB)
Abstract: 317,092. White, A. E., (Burroughs Adding Machine Co.). Aug. 10, 1929. [A Specification was laid open to inspection under Sect. 91 of the Acts, Aug. 12, 1929]. Transfer mechanism.-The mechanism comprises transfer members each connected to lock higher and lower adjacent numeral wheels by planetary gearing and normally held by detent mechanism which is released when an intermediate member, connected with the lower numeral wheel, is moved to a predetermined amount, the inter- .mediate member then returning to normal and moving the transfer member to shift the higher numeral wheel. The mechanism permits simultaneous actuation and transfer and also transfer in both directions. .Counter pinions 10 rotatable on a shaft 11 are each engaged by a respective actuator rack 12, the racks being raised into engagement with the pinions only when the machine is being operated. For an addition the racks are moved to the left, Fig. 5, and for a subtraction to the right, Fig. 6. The pinions 10 are locked by spring-controlled pawls 13 which, after the racks are moved into engagement with the pinions, release all the latter by the co-operation of a bail 17 with all the pawls 13. Before the racks are moved out of engagement With the pinions, the latter are locked again by a reverse motion of the bail and pawls. Each pinion 10 is connected to a gear 20 meshing with a second gear 21 pivoted on a cross shaft 22. Each second gear 21 has an arm 24 extending outwardly from its hub, upon which arm is pivoted a planet gear 25 meshing with a normally stationary sun gear 26 and also with an internal gear 27 attached to the numeral wheel 28. The sun gear 26 of units order, is fixedly mounted on the side plate 23, Fig. 2. A clockwise rotation of the pinions 10 in the adding operation, Fig. 5, thus causes a counterclockwise rotation of the numeral wheels. The transfer mechanism proper, of which there is one set between each pair of numeral wheels, one set only being described, comprises a sun gear 31 attached to its adjacent lower numeral wheel 28 and gearing with a planet pinion 33 fixed to a shaft 34 journaled in an arm 35 which can swing about the cross shaft 22. Fast to the pinion shaft 34 is another pinion 36 meshing with an internally toothed transfer gear 37, the hub of which has a pinion 26 forming the sun gear 26 for operating the adjacent higher numeral wheel 28. The transfer wheel 37 is normally locked against movement in either direction by an addition detent 40 and a subtraction detent 41, the two detents being connected by a spring 42. The lower end of the swinging arm 35 is connected by a link to a yokeshaped member 52 pivoted on a shaft 53 and having an arm 54 controlled by a spring 55 connected to a bail 56 which can be moved from its addition position, Fig. 5, in which it urges the swinging lever 35 clockwise, to its subtraction position, Fig. 6, in which it urges the swinging lever counterclockwise. For transfer during addition the units numeral wheel 28 is rotated counterclockwise from its rack 12 and thereby causes the clockwise rotation of the planet pinion 33 which, the transfer wheel 37 being locked, moves the arm 35 counterclockwise. When the units numeral wheel passes from its " 9 " to its " 0 " position, the end of the swinging arm 35 lifts the detent 40, Fig. 5, and is then returned by its spring to its normal position, causing a clockwise rotation of the released transfer wheel 37 and its associated pinion 26. The counter pinions 10 are engaged by their racks during these movements, although they may be simultaneously operated from their respective racks during the transfer operation. The clockwise rotation of the pinion 26 attached to the units transfer wheel 37 causes the counterclockwise rotation of the tens numeral wheel 28 through the planet pinion 25, the latter being prevented from rotating about the cross shaft 22 by the engagement of the corresponding counter pinion 10 with its rack. Transfers during subtraction are similarly effected, the motion of the parts being reversed, as shown in Fig. 6, and the opposite detent 41 being moved by the lever 35 to free the transfer wheel 37. Zeroizing-mechanism. - Zeroizing is effected after an adding operation by the upward movement of a hand lever 60 attached to a cam plate 62 secured to a cross shaft 63, Figs. 3 and 4. The cross shaft 63 is of semi-circular section and when rotated clockwise, as seen in Fig. 3, by the operation of the hand lever, moves the pawl 13 to free the counter pinions 10. To the same shaft 63 are also attached fingers 64, Fig. 3, which engage the yokes 52 and cause the clockwise rotation of the swinging levers 35. The cam plate 62 is controlled by a spring 65, the hand lever 60 normally resting on a stud 66 secured to a member 67 attached to a shaft 68. The member 67 also carries a stud 69 which is engaged by the cam plate 62 when the lever 60 is moved upwards in such a manner as to rock the shaft 68 in a counterclockwise direction, Fig.3. The shaft 68 carries stop arms 70 which, by this counterclockwise rotation, are brought into the paths of stops 71 on the numeral wheels. The clockwise movement of the swinging links 35, caused by the operation of the hand lever 60, causes a counterclockwise motion of the pinions 36, 33, since the transfer wheels 37 are locked by the detents 40, 41. The latter pinion 33 moves the pinion 31 and its attached counter wheel 28 in a clockwise direction until the counter wheel reaches its zero position, at which time its stop 71 contacts with the corresponding arm 70. If zeroizing is required after a subtracting operation, the spring-carrying bail 56 is automatically moved from its lower position, Fig. 6, into its upper position, Fig. 5, through its engagement with the end of a lever 81 which is moved upwards about its pivot 82 upon the operation of the hand lever 60.