Patent GB-1340132-A (GB)
Title: Device for cutting and stripping back electric wires and cables
IPC: H02G1/12
Filed: 1971-04-19
Abstract: 1340132 Stripping cables ING C OLIVETTI & C SpA 19 April 1971 [21 March 1970] 24735/71 Heading H2C A device for cutting insulated wires and stripping end portions of their insulation comprises a pair of jaws 1, for clamping, and a pair 2, for cutting and notching. The clamping jaws 1 comprise a pair of arms 9 and 10 being pivotally connected to one another by a pin 13. Another pin (14) (Fig. 2, not shown), perpendicular to pin 13 and at the rear of arm 9, permits jaws 1 to rotate away from jaws 2. The cutting and notching jaws comprise a lower immovable arm 16 and an upper arm 17 pivotally connected to arm 16 by means of a pin 18. A slide with a cross-member 19, longitudinally movable above jaws 1 and 2, has a tongue 22, integral with a rod 20 actuated by a piston 21, the tongue sliding in a slot (23) (Fig. 2, not shown). A small wheel (24) mounted on the slide (Figs. 3 and 4, not shown) rolls on the surface of wall 5, both tongue and wheel providing guiding means. The slide has two cams, in the form of inclined planes, a first plane 25 being situated on its lower surface and a second plane 26 being disposed on one of the sides of the slide, plane 25 coacting with wheels 27 and 28, on arms 10 and 17 respectively, the wheels being arranged so that plane 25 comes into cooperation with wheel 27 before wheel 28. In addition, plane 26 is adapted to coact with roller 30 on arm 10, the roller being arranged' so that it will only coact with plane 26 after the wheel 28 has been deflected to its lowermost position by plane 25. The slide is operated by pneumatic means provided by piston 21 sliding in a chamber 33 and controlled by a lever 45 operating on a valve stem 39, the piston operating against spring 34. Springs 50 and (51) (Fig. 4, not shown) hold arms 10 and 17 respectively, away from their co-operating lower arms and a tension spring (53) (Fig. 3, not shown) holds jaws 1 against jaws 2, jaws 1 being provided with plane surfaces 54 (Fig. 5), abutting against notching blades 55 secured to each arm of jaw 2, the arms also being provided with cutting edges 60 and 63. A thin layer of soft material 68, e.g. rubber, is preferably fastened to the front of arm 10. An insulated wire 71 is inserted through jaws 1 and 2 and the operating lever 45 depressed, thus allowing compressed air to enter via connection 38 and to push piston 21 and the slide to the left. Inclined plane 25 then co-operates with wheels 27, 28 and 30, in that order, so that jaws 1 are closed, clamping the wire, jaws 2 are closed, shearing the end of the wire and notching the insulation, jaws 1 are rotated away from jaws 2 to pull the notched insulation from the end of the wire (Figs. 6 to 9, not shown) and finally, further rotation of the jaws causes wheel 27 to be removed from under the slide allowing arm 10 to spring away from arm 9, thus releasing the cable. By releasing lever 45, the air valve disconnects the compressed air line from the chamber (35) (Fig. 2, not shown) which is then connected to atmosphere, allowing piston 21 to move back to the  rest position.