Patent GB-190218853-A (GB)
Title: Improvements in Calculating Machines.
Inventor: DYMOND GEORGE CECIL
Filed: 1902-08-27
Granted: 1903-05-28
Abstract: 18,853. Dymond, G. C., [Howieson, J. T., and Spiekerman, F.]. Aug. 27. Calculating-apparatus.-Relates to calculating- apparatus which is especially designed for use as an attachment to a type-writing machine, although it may be used separately. As described in connection with a type-writer, when the numeral keys are operated, the registering devices are thrown into position by a spring-pressed cam-plate. which is adjustably mounted upon a bar carried by the paper carriage or other moving part of the machine actuating the ends 19 of a series of tripping devices 18. The depression of the numeral keys also actuates, through the connecting-links 41, the corresponding pivoted levers 33, causing projections 35, the positions of which are varied according to the numeral value of the different levers, to come into contact with arms 9, and rock the main shaft 7 in which the arms 9 are adjustably mounted. The arm 23, swung forward by its tripping-device 18, depresses a pivoted pawl 53, so that when the shaft 7 is rocked, an arm 9 engages the hooked end 63 and draws forward both the pawl 53 and the pawl carrier 51. During the forward movement of the pawl carrier 51, a roller 67 thereon comes into contact with the underside of a flange 68 and lifts the cam plate 55. The upper side of the flange 68 then comes into contact with a roller 74 and lifts its segmental rack 56. Simultaneously, the finger 72 of the cam plate 55 depresses a pivoted pawl 54 until its hooked end 81 lies in the path of an arm 9. The further movement of this arm 9 carries the pawl 54, its carrier 52, and the segmental rack 56 forward, and effects the rotation of the registering- wheel 16. As the lever 33 is depressed, a pin 86 enters a cam-slot 87 and rocks a plate 29 to throw the arm 30 into position to strike the forward edge of the rack 56, to stop it at the completion of its movement. The point at which the arms 30 stop their respective racks are determined by the shapes of the slots 87. The completion of the full stroke of the lever 33 releases the locking-dog of a fullstroke device, the main shaft 7 with the arms 9 being returned to normal position by a spring. As the arm 9, which was engaged with the hook 63, returns, it strikes and returns the pawl carrier 51 and the parts attached thereto. The cam plate 55, being no longer supported by the roller 67, drops, and with it the rack 56, both being returned to normal position by the spring 76. To ensure a full stroke of the lever 33, a toothed arm 99 moves along under the toothed dog 97 when the plate 29 is rocked by the engagement of the pin 86 with the cam slot 87, but is prevented from moving backward until the dog 97 is raised by the projection 36 lifting the cross bail 89. The lifting of the bail 89 causes a projection 95 to raise the dog 97 and permit the rocking-plate 29 to return to its normal position. At the same time, the finger 94 engages a lever 96 and holds the bail 89 and the dog 97 in the raised position until the lever 96 is released by an adjustable stop 102 on the arm 99. The carrying-mechanism of the registering-wheels comprises mainly a radial pin 105, a ratchet-wheel 106, and a pivoted double-armed pawl 28, the two arms 107, 108 of which are respectively arranged in the planes of the radial pin 105 of a lower registering-wheel and of the ratchet-wheel 106 of the next higher registering- wheel. A weighted pawl 111, pivoted to the arm 108, engages the ratchet 106, overthrowing being prevented by a stop 114'. When the fork 109 of the arm 107 is depressed by the pin 105, the upper fork 110 rides upon a cut-away portion of the registering-wheel, and subsequently passes on to the periphery of the wheel and raises the arm 108 and its pawl 111 to free the registering-wheel. The arm 108 and the pawl 111 are also lifted directly by an arm 115 on the cam plate 55. The registering mechanism is disconnected from the type-writer keys by the engagement of arms 118 on the levers 49 with spring latches 119 when the links 41 are pushed backward to disconnect them from the numeral keys. Spaces for printing commas or separating periods between the numbers are obtained by shifting the tripping-devices longitudinally by the engagement of specially-shaped slots in plates 123, 124 carried by pivoted levers 126 with pins 22<1> on the sleeves 22 which carry the arms 23. The slots of a third plate 125 engage the pins 22<1> in any position to which they may have been shifted, so that, when this plate is depressed, it will return the sleeves and the tripping-devices to normal position. The levers 33 may be operated independently of the type-writer keys by means of the handles 33<1>, and by means of a screw the operating cam plate can be forced out of position, when the total may be written without effecting any further operation of the registering- devices. The re-setting of the registering-wheels to zero is preferably effected by moving the rod 15 longitudinally so that the pins 143 engage with the pins 105. Sleeves and collars are provided to prevent lateral movement of the registering-wheels and of the pivoted pawls respectively, and the form and arrangement of the several elements of the machine may be varied.