Patent GB-190905204-A (GB)
Title: Improvements in and relating to Adding or Calculating Machines.
Inventor: HUNTER JOHN PIRRONG
IPC: G06C23/02
Filed: 1909-03-03
Granted: 1910-02-03
Abstract: 5204. Hunter, J. P. March 3. Electric driving-mechanism; alarms.-In motoroperated addiog and number-printing machine, having a continuously-running motor, and an intermediate shaft adapted to be coupled to the motor shaft and to the main operating rock-shaft of the machine, by a clutch as described in Specification 7823/08, means are provided for controlling and regulating the power-transmitting mechanism and for locking the manually-operated starting- bar : (1) against accidental operation until the motor has been properly energized, (2) until the motor has attained a predetermined speed, and (3) until the operating rock-shaft has returned from the preceding operation towards its initial position. To the base of the machine is attached the shell containing the clutch mechanism and a worm-shaft 124, which is detachably secured to the motor shaft 125. The control ring 131 of the clutch, Fig. 13, mounted on the clutch shaft 130, has one of its toes 132 held by a roller 133 mounted on an arm 134 and until freed by tilting this arm prevents the temporary coupling of the motor to the shaft 130. The arm 134 is rocked from the starting-bar 142 through the elbow levers 138, link 145, crank 146, rock-shaft 147, link 148, and arm 150 ; the arm 150 being secured to the rock-shaft on which the arm 134 is mounted. Secured to the shaft 130 is a crank 154 having a number of arms 155, each provided with a roller 156. Between the cranks and the main rock-shaft 2, Fig. 1, is mounted a rack bar 160 guided to move in a straight line by a pin 162 moving in a slot 161 and by a roller 170 engaging a flange on the nnderside of the rack bar. Teeth 164 on the rack bar are adapted to engage the teeth 158 of a wheel 157 secured to the rock-shaft 2. The roller 170 is supported by a frame 167 and can be adjusted in such a position that the rack bar can be disengaged from the gear 157 so that there is no operative connexion between the shafts 2 and 130, in which case a handle is placed on the shaft 2 to actuate the machine. (1) The arm 134 is prevented from moving before the motor is energized, by the engagement of a latch 193, Fig. 6, on an extension 192 of the push-button 184 of the motor-sorting switch 176 with a latch on the link 148 of the starting-bar. Electric conductors 185, 186 are in circuit with the switch 176, and, when this is in the position shown in Fig. 6, the circuit is completed and the motor is energized ; at the same time the latch 193 is moved out from engagement with the latch on the link 148. An electric lamp in the motor circuit indicates completion of the circuit, and a bell is rung by the arm 196 on the extension 192 tripping the bell hammer. (2) Secured to the end of the worm-shaft 124 is a controller comprising a hub 210, Fig. 11, attached to the shaft, provided with a disk 211 having a number of slots 212 and a groove 213, through which passes a corresponding number of pins 214. On the other side of the disk is provided the same number of radial pins 215, each adapted to receive a sector 216 with pins 219 passing through the slots 212 and connected to the pins 214 by springs. Mounted on the rock-shaft 151 is a locking-arm 225 with a tip 226 which rests against the annular flange 221 of the sector 216 when the roller 133 is engaging one of the toes 132, so that the arm 134 cannot be tilted until the shaft rotates with sufficient velocity to allow the tip 226 to fall inwards, centrifugal action causing the sectors to move out radially. The inner edges of the flanges 221 are made sloping to facilitate disengagement from the tip 226. (3) A locking-arm 230 on the crank 146 is provided with a slot 231 and with a projecting flange 233 to co-operate with a lock plate 235, loosely mounted to oscillate on a pivot 234 and provided with flanges 237, 239, adapted to engage the flange 233 and to be engaged by a stop foot 4 on the oscillating plate 3 respectively. When the starting-bar is depressed, the shaft 130 is coupled to the shaft 124 and the plate 3 is oscillated with the shaft 2, thus causing the foot 4 to move away from the flange 239 to bring the flanges 233, 237 into locking position, so that the bar 142 cannot be moved until the return movement of the plate 3, whereupon the foot 4 comes into contact with the flange 239, and restores the parts to their initial position.