Patent GB-411884-A (GB)
Title: Improvements in or relating to paper cutting machines
IPC: B26D7/01
Filed: 1932-10-18
Abstract: 411,884. Paper - cutting apparatus. STEVENS, A. H., 5, Quality Court, Chancery Lane, London.-(Harris-Seybould-Potter Co. ; Union Trust Building, East 9th Street, Cleveland, Ohio, U.S.A.) Oct. 18, 1932, No. 29136. [Class 31 (i).] A paper-cutting apparatus comprises means for advancing a stack of sheets relatively to a knife, the advancing means being adapted to be rendered inoperative successively at a plurality of separate predetermined points by travelling members movable in a path proportionately to the travel of the advancing means and cooperating with a plurality of adjustable control or stop means settable in a common guideway along said path at predetermined points. In the construction described with respect to Figs. 1, 2, 4, 5, 10, 13, 15, 16, 20 and 24, a stack of sheets 2 is adapted to be moved forward to a knife 4 by means of a feed bar 3 which may be driven through friction gearing brought into operation manually or through toothed gearing involving clutch mechanism engaged electrically. The bar is connected through a clutch 132 with a chain 131 adapted to be driven by a shaft 113 provided with loosely-mounted gear wheels 114, 115 located in a box 99. These wheels are driven from shaft 100, the wheel 115 through reduction gearing, and are provided with cylinders 118 and clutch members 119. Each member 119 is pressed away from its associated cylinder 118 by a spring 120 adjustably compressed by a screw 121 and counterbalanced by springs 123. A clutch face 126 is provided for engagement with a clutch 128, which may be moved from the neutral position shown in Fig. 9, by means of a lever 142 whereby the shaft 113 is driven at high or low speed. The lever 142 is moved by actuation of a slidable bar 146 which is provided with pins 156, 157 engaging in slots 160 in brackets 158, 159. These brackets are pivotally mounted on shafts 109 110, respectively, Fig. 10, which constantly rotate and are provided with fixed ratchet wheels 111, 112. Movement of the bracket 158 is produced by the energization of either of two electromagnets 164, 171, the armatures of which are connected to pawls 161, 168 adapted to engage the ratchet wheel 111 when the corresponding electromagnet is energized. The magnet 171 acts to throw the clutch 128 from slow speed position to neutral position, and the magnet 164 to change the clutch from neutral position to high speed position. The bracket 159 is rocked by a pawl 175 engaging the ratchet wheel 112 on energization of the electromagnet 178. Cam means are provided for releasing the pawls from the ratchet wheels during the movement of the pawls. The movement of the bracket 159 throws the clutch 128 from high speed position to low speed position. The motion of the feed bar 3 is communicated through a connecting upright 59 to a chain 60 and thereby a transversely-movable slide 70, Figs. 1 and 15, provided with a scale-reading device 75 for co-operation with a scale bar 44. The bar has a dovetailed groove 46 to receive correspondinglyshaped lugs screwed to blocks 48. Each block has a stop roller 52 with a steel rim on an insulating core. An additional stop roller 54 Fig. 16, may be mounted in a block 55 which is adjustably mounted on the block 48 by a set screw 56 passing through a slot 57. The rollers 52, 54 are adapted to be engaged by rolls 84, 85, 92, 93, Fig. 20, carried by bell crank levers 81, 82, which are movable with the slide 70. Engagement of either of the large rolls 85, 93 with the corresponding roller 54 or 52 causes the upper end of the bell crank 81 to close contacts 87, 88, whereby electromagnet 178 operates to change the movement of the feed bar 3 from high to low speed. Further movement of the slide causes the roller 52 to bridge the gap between rolls 84 and 85 and complete a circuit through the electromagnet 171 whereby the feed bar 3 is stopped to permit the sheets 2 to be cut. The cut is made by the manual operation of a draw bar 41 which throws in a clutch to cause the knife 4 to move down and up. The upward movement closes switch contacts 214, 215 to feed forward the bar 3, which stops again when the roller 54 bridges the gap between the rolls 92 and 93. A second cut is then made near to the previous cut, after which the feed bar 3 again moves forward. At the end of its traverse it causes a pivoted contact 225 to engage contacts 226, 227 in turn whereby electromagnets 178 and 171 are energized and the feed bar is driven first at low speed and then stopped. The feed bar is returned to starting position by means shown in Figs. 4 and 5. The shaft 10 continuously rotating drives a shaft 13 provided at one end with a friction disc 14 engaging a friction roller 15 which is slidably mounted on shaft 18. The position of the roller 15 with respect to the axis of the shaft 13 may be varied by the operation of a handle 25 whereby a rod 17 is shifted longitudinally, the rod carrying a bracket 16 engaging the roller 15. The handle 25 may take up three positions with respect to a quadrant 26, corresponding to which positions the shaft 18 rotates in one direction or in the reverse direction or is stationary. By the operation of the handle the feed bar 3 is caused to return to its starting position. The feed bar may be moved forward without electrical means, by the manipulation of the handle 25, in which case clutch 132 and the wires leading to box 99 are disconnected. When the paper reaches near to the place for the required cut, switch 87, 88, is closed and a red light 222 is lit, whereupon the operator throws bell crank 24 to neutral and turns screw 32 by head wheel 36, until roller 52 or 54 completes the circuit between rolls 84 and 85 or 92 and 93 respectively, when a white light 223 is lit. Magnet 302 is then energized to free the draw rod 41 and magnet 184 is energized to stop rotation of screw 32 by effecting the engagement of a pawl with a ratchet 182 on the shaft 18. The cut is then made after which the pawl is disengaged by a lever which is lifted manually so that the screw 32 may again be operated. In a modification shown in Figs. 25, 29, 30, 31, and 34, a stack of labels 232 on a base board 231 is advanced towards a knife 235 by means of a pushboard 236. The pushboard carries four contact rollers 262 . . . 265 adapted to engage rollers on stops 244 which are adjustably fixed along a gauge plate 241 in positions determining where the stack of labels is to be cut. The four rollers are carried by two slides 256, 257 pressed outwardly by springs 267, 268. In operation, the pushboard 236 is advanced by power applied to a screw-threaded shaft 234 until the roller 262 engages the roller 251 of the first stop whereupon the slide 256 is pushed backwardly. Contacts 275, 276 are thereby closed to complete a circuit for a signal lamp 274. The operator disconnects the power source from the shaft 234 and turns it by means of the hand wheel 233. When the roller 251 bridges the rollers 262, 263 a circuit is complete through solenoid 279 whereby lever 287 is actuated and a pawl 286 is brought into engagement with teeth on a ratchet wheel 284. This prevents further operation of the hand wheel 233 so that the pushboard ceases to advance. The knife-operating mechanism is then operated to make the first cut on the stack of labels. The lever 287 is next raised to release the pawl 286 and power is applied to advance the pushboard. To prevent the knife from operating until the proper position for the cut has been reached, a pivoted bell crank lever 291 is provided in operative relation with a draw bar 291 controlling the actuation of the knife. A spring 293 normally holds the bell crank in engagement with a notch 294 in the draw bar, disengagement being effected by the energization of a solenoid 280, which is in parallel with the solenoid 279. The upper slide 257 on the pushboard 236 is brought into use when it is desired to make two cuts close to one another. An upper roller 295, Fig. 34, mounted on a plate 296 adjustably secured to a stop 244 is adapted to make contact with the rollers 264, 265 on the slide 257, the action being similar to that taking place when the first cut is being effected. After the final cut has been made and the labels have been removed, the pushboard is retracted by reverse operation of the shaft 234.