Patent GB-1118861-A (GB)
Title: Wire cutting and stripping machine
IPC: B26D5/20
Filed: 1966-11-23
Abstract: 1,118,861. Wire cutting and stripping; shearing. ARTOS ENG. CO. 23 Nov., 1966 [12 Sept., 1966], No. 52449/66. Headings B3A and B3W. A wire cutting and stripping machine has driving means, cutting and stripping means operable by the driving means and transport means driven by said driving means to convey wire to the cutting and stripping means, said - transport means comprising wire feed means selectively engaging the wire and a reciprocable wire guide movable toward said cutting and stripping means to guide the wire thereto and movable away from said cutting and stripping means during the cutting and stripping operation. General description.-The machine 30, Fig. 1, comprises a base 32 on which are mounted an opposed-belt type wire feed mechanism 88 and 90, a tubular wire guide 168 which reciprocates axially, a pair of wire cutting blades 254 and 256 and two pairs of insulation cutting and stripping blades 260, 262, 264 and 266. At the entry to the machine there are a wire lock 194 and a wire holder 192 and at the exit from the machine there is a wire lock mounted on the right hand stripping arm 300. The various mechanisms are operated by plate cams mounted on a vertical spindle 326 which is driven by an electric motor and which also carries a hand wheel 364. Wire feed mechanism.-The feed-belts 118, 120 are driven by pulleys 104, 106 and pass over tension adjusting pulleys 114, 116. The line of the belts is adjusted by idler pulleys 126, 128. The frames 92 and 94 supporting the pulley assemblies are each pivotable about the axis of their respective driving pulley to move the belts into and out of contact with the wire. The frame 94 is oscillated by a bell crank lever, one arm 150 of which bears on the frame 94 through a spring 160 and the other arm of which is connected by a cable to a cam operated lever. The corner 148 of the other arm engages a notch 434 in a lever 246 to look the frames in the wire engaging position. Wire guides and clamps.-Wire 87 entering the machine passes through a tightly coiled spring guide 167 to the reciprocable tube 168. While the wire is being fed by the belts the guide is moved so that its exit end is between the cutting and stripping blades. At the end of the feed cycle the belts move apart and the guide moves to the position shown in Fig. 5. The guide is reciprocated by an endless cable 169 which passes over four pulleys 170, 172, 174, 176 mounted on a base 178. The cable 169 is reciprocated by a crescent-shaped lever 190, Fig. 2, operated by cams 370, 372. The entry wire holder 192 holds the wire 87 while the tube 168 is moved towards the cutting and stripping blades in preparation for feeding the wire. It consists of an anvil 218 and a jaw 220 which is moved towards the anvil by a spring (226), Fig. 9 (not shown). The jaw is moved away from the anvil by a pivoted lever 228 actuated by a cam 356. The wire lock 194 comprises an anvil 196 and a hammer 204, which is biased towards the anvil by a spring 212 and moved away from the anvil by a lever 440, which is operated through a reset rod 444, lever 448 and a cam 392. The exit wire lock 195 is mounted on the arm 300 and has a downwardly extending anvil against which the wire is forced by a hammer (228), Fig. 10 (not shown). The hammer is spring-loaded towards the anvil and is moved away from it by the lever 246. Wire cutting and stripping blades.-The wire cutting blades comprise a blade 254, Fig. 22, the position of which is adjustable by a micrometer screw 258 and which is reciprocated by a cam 392, and a co-operating blade 256 which is reciprocated by a cam 390. Two insulation cutting and stripping blades 260, 262, Fig. 11, are mounted on opposite sides of the blade 254 for adjustment therewith. Co-operating blades 264 and 266 are mounted on opposite sides of the cutter blade 256. After the wire has been severed and the insulation cut, the newlyformed ends of the wire are drawn apart to strip the insulation, which falls into a shoot 270. The stripping means on the exit side comprises the stripping arm 300 which is pivoted on a pin 280 to swing in a small arc. The entry stripping arm 294 is similary mounted on a pivot 296. A wire gripper 286 is slidably mounted on the arm 300 and clamps the wire against an anvil (226), Fig. 12 (not shown) and a similar gripper 302 is slidably mounted on the arm 294. The stripping arms are driven by links 308 and 310 which are pivoted on a common mounting 312 and each extend to one of the grippers 286, 302. The mounting 312 is reciprocated along a bar 272 by identical eccentrics 410, 412 and the links 308, 310 move the grippers forward to clamp the wire. When the grippers are unable to move further forward the continued movement of the mounting 312 causes the arms 294 and 300 to swing outwards, drawing the wire through the stripper blades. Driving mechanism.-The cam-shaft 326 is driven by the motor 36 through a step-down belt drive including a belt 44 and a pulley 48. The pulley 48 is connected to the shaft 326 by a one-revolution clutch 330, see also Fig. 19 (not shown). The pulley 48 includes a downwardly extending collar 332 which is mounted on the outer race of a bearing 334 on the shaft 326. Keyed to the shaft 326 is a plate 336, one end of the key 338 projecting beyond the periphery of the plate 336. A coil spring 342 surrounds the collar 332 and the plate 336, one end of the spring being engaged in a notch 346 in a sleeve 344 surrounding the spring and the other end entering a hole 348 in the plate 336. A radial stop face 350 is formed on a lug projecting from the sleeve and is engaged by the end face of a pivoted lever 352, Fig. 19 (not shown). When the lever 352 is disengaged from the stop face the spring contracts to its natural diameter and drive is transmitted from the collar 332 to the plate 336. Due to the winding of the spring the stop face 350 advances a small angular distance relative to the side face of the key, with which it was previously aligned. After one revolution the lever 352 re-engages the lug so that the spring expands and the drive ceases. The shaft 326 is stopped exactly in its original position by the key 338 abutting the lever.