Patent GB-190807823-A (GB)
Title: Improvements in and relating to Adding Machines.
Inventor: SEFTON-JONES HERBERT
Filed: 1908-04-08
Granted: 1909-04-08
Abstract: 7823. Jones, H. Sefton-, [Adder Machine Co.]. April 8. Typewriters and like machines.-In motor-driven adding and listing machines, upon depression of a starting-key, a friction clutch transmits the power from the continuously rotating motor shaft to the oscillating shaft of the machine. The motor 100, Fig. 9, drives a worm-wheel 103 through a shaft 101 and worm 102 ; the worm-wheel is loose on the shaft 105 and has attached to it a shell 104 provided with a friction ring 106. To connect the motor to the shaft 105, a carrier 107 fixed to the shaft 105 supports a plate 108 having radial arms 109, 110 ; a clutch arm 117 having terminal surfaces 118 is pivoted on each arm 110 and is controlled by springs 119 attached to pins 120 on the arms 109. The clutch arms 117 each have a piu 20 engaging a slot 121 in a control ring 113, which is loosely mounted on the flange 99 of the disk 112. The hub 111 of the carrier 107 is provided with a cam disk 115 having three depressions 116 ; a roller 154 on the arm 153, Fig. 1, connected to the starting-key engages the periphery of the cam disk and is pivoted to a shaft 150 on which is fixed an arm 151 having a holder 152 engaging one of the toes 114 of the control ring 113, and also an arm 146, the other end of which is pivoted to the lower end of the starting-key 140. The outer end of the shaft 105 has a plate 130, Fig. 1, provided with three arms 131, each having a roller 132 adapted to engage an arm 135 mounted on the main shaft 136 of the adding-machine. In the normal position, Fig. 8, the surfaces 118 are held out of contact with the ring 106 by engagement of the pins 20 with the sides of the slots 121 of the ring 113, which is maintained in a stationary position by the holder 152. In operation, the key 140 is depressed to swing the arm 146, rock the shaft 150, and move the holder 152 out of engagement with the toe 114 ; simultaneously the roller 154 moves into contact with the cam disk 115. The pin 20 is now no longer prevented from moving as the control ring is free, whereupon the surface 118 engages the ring 106, communicates the motion of the shell 104 to the shaft 105 and to the plate 130, and brings one of the rollers 132 into contact with the arm 135 to oscillate the main shaft 136. By this oscillation the arm 160 moves away from the lip 157 of the latch 155 causing the latch to press against the key stem 141. When the key 140 is raised by the action of the roller 154 on the depressions 116 of the cam disk 115, the lip 158 of the latch 155 is drawn under the notch 145 holding the key in its normal position and preventing its depression until the arm 160 returns and releases the lip 158 from the notch 145. At the same time the roller 154 restores the holder 152 to its position against the toe 114 and holds the ring 113, the clearance of the pin in the slot 121 causing the parts to move a slight distance and disengage the surface 118 from the ring 106 and thereby interrupt the motion. This movement stretches the spring 119, which then brings the parts back to their normal positions, in which they are maintained by the pawl 126. In the arrangement shown, the oscillating shaft is actuated three times for each rotation of the shaft 105 owing to the provision of three rollers 132, three toes 114 of the control ring 113, and three depressions upon the cam disk 115. [Reference has been directed under Section 7 of Patents &c. Act, 1907, to Specifications No. 9588, A.D. 1903, and Nos. 4669 and 18,628, A.D. 1906, [Abridgment Class Registering &c.].]