US 1477678 A
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M. P. WETMCRE MACHINE FOR STRIPPING INSULATION FROM ELECTRIC WIRES Filed Feb. '7. 1921 Patented Deal8, 1923.
- *i MINER'P. WETMORE, OF NEWARK, NEW?. JERSEY.
l MCHINE FOR STRIPPXNG XNSULTON FROM ELECTR'KC WXRE.
Application tiled February 7, 1921. `Serial No. 4,422,901.
'Numerous pieces of 'such wire, from two to ten feet in length, are used in wiring the lighting, ignition, and other Vcircuits of a modern motor car, and' the insulation must be stripped oil' from the-inch or so of each end Aof each such piece of' wire in order to permit the bared Vwire to make good contact with the binding poststhrough which4 current is'to vbe conveyed.` My present invention supplies a convenient apparatus for thus removing such-portions of insulation rapidly and neatly. vThe best form of apparatus at present known to me embodying my in-4 vention is illustrated in g the accompanying sheet of drawin s' in which Fig. 1 is a si e .elevation of the machine, parts being shown' in section, and
Fig. 2 is an end` elevation, arts being broken away and ,others omitted).
Throughout the drawings like reference characters indicate likeparts. 1 is the end of a piece of wire in process of yhaving the Asheath of insulating material removed from fone, end which has been Yintroduced into the machine. 2 is a swinging member at 4, to the stationary member 3, W ich is mounted on'the main frame of the machine. The abutting surfaces of the arts 2 and 3 are cut away .to .leave a cylin rical space in which the wire 1 may be firmly grasped, as in a clamp, when the part 2 is swung in a counter-clockwise direction on pivot 4 by spring 26, connected to one extremity of the said moving member. 5 is a wire or other link connecting the vother extremity of the swinging member 2 and-the treadle 6 so that when said treadle is depressed the said member will be swung in a clockwise direction and the clamping faces on 2 and 3 thereby separated so `that the wire 1- may be placed'Y between them. When the treadle 6 is released the spring 26 will force the clamping faces together on vany wire placed heivoted i tween them andY hold it in the position shown in the drawings.
7 is-another wire or other link extending from'treadle 6, to the horizontal arm of a bell-crank 8, the vertical arm of'which bears against the end of the shaft 9, which is mounted in the rotatable sleeve 13, journaled 1n a housing on the main frame. The end of the shaft 9 is normally forced against the vertical arm of bell crank 8 by spring 22 confined between the end of sleeve 13 and a collar 21 fasten the shaft. The other end of shaft 9 carries the disc 10 which has a beveled edge. This beveled edge bears against correspondingly beveled shoulders 25, 25, one of which is formed on housing 11 pivoted at 12 to the side of pulley 16, and the other of which is formed on inger 14, also pivoted to pulley 16 at a point l5 opposite to the pivot 12.
Housing 11 serves as a pivoted journal bearing for shaft 24, which carries a disc cutter 17 on. its outer end and a pinion 18 on its inner end, which pinion meshes with a gear wheel 19, which is concentric with the axis of the rotatable frame formed b the sleeve 13 and the pulley 16, which axis is in line with the axis of the wire 1 held in v the clamp. This gear wheel 19 may be stationary, but .preferably it is rotatable on sleeve 13 and connected to a pulley 20, or other means for giving it a positive rotation in a direction opposite to vthat in which the pulley 16 is rotated.
23, 23, are springs tending to swing housing 11 and linger 14`toward each other so that they bear on the edge of beveled dlsc 10.
ln this position the end of linger 1t and the edge of disc cutter 17 bear on the insulating' .covering ot the wire 1 being held inthe clamp.
27, 27, represent Vilaring l1 s the clamp faces 2 and 3 w 1ch together form a bell-mouthed guide for the end of the wire being introduced into the clamp when said clamp `has been slightly opened by pressure on treadle 6.
The modeof operatlon of the particular `:form of my invention above described is as follows Normally, the parts are in the position shown in Fig. 1, the gear wheel 19 bemg rotated in one direction .and the rotatable frame formed' by pulley 1.6 and sleeve 13 being rotated inthe opposite dlrectlon. One spring 23 forces the end of finger 1t against'wire 1 and preventsl it bending away formed on lllltl is also being rapidly rotated on its axis by v pinion 18 and gear wheel 19. This cutter 17 soon severs the part of the insulating sleeve on the end of the wire 1, projecting through the clamp, from the remaining insulation. The' operator then pulls the wire out of the clamp. This strips the cut portion of insulation from the end of the wire, leaving the metallic strands thereof exposed and ready for attachment to the proper binding posts. The operator then presses treadle 6 downward, which both oscillates the swinging member 2 so as to open the clamp for introduction of the end of another wire, and moves disc 10 so that its bevelled edge wedges between bevelled surfaces 25, 25, swinging the disc cutter 17 and pressure finger 14 apart softhat the end of the wire may also pass between them. On releasing treadle 6, spring 22 withdraws bevelled disc 10, so that springs 23, 23, swing the disc cutter and pressure linger back into position to operate, as before described on the Wire, which is then held by closing of the clamp.
The slight necessary movement of housing 11 on pivot 12, is not sufficient to disengage pinion 18 from gear 19, so the'disc cutter 17 is rotated continuously.
Having described my invention, I claim:
1. The combination, with means adapted for loosely holding and guiding the end of an insulated wire, but ermitting motion of said wire along the l1ne of its axis, of a revoluble frame journalled so that its axis of revolution will be in line with the axis of the wire so held, a rotary disc knife-edged cutter having a yielding journal bearing on said frame in a position such that the edge of thecutter may bear on the surface of the wire so held, means for swinging said bearing so that the cutter may approach or recede from the Wire, and means for rotating both said frame and said cutter about their respective axes.
2.l The combination with a hinged clamp adapted for holding the end of an insulated wire and yielding means normally holding said clamp closed, of a revoluble frame journalled so that its axis of revolution will be in line with the axis of the Wire held in the clamp, a rotary disc cutter vhaving a journal bearing flexibly mounted on the rotary frame so that said cutter may approach or recede from the wire held in the clamp,
mechanism for rotating the frame and the j and means for simultaneously opening the Vclamp and swinging the cutter out ofz the' path of any wire being inserted in the clamp.
3. The combination with a rotary frame and means for rotating it, of a rotary cutting disc mounted on one end of a rotatable shaft, a journal bearing for the other end of said shaft hinged to the rotary frame so as to swing in the plane of the axis of said frame, a pressure finger similarly hinged to the rotary frame at a point opposite the cutter, spring means tending to swing the cutter and finger toward each other, means for rotating the frame and the cutting disc on their respective axes and mechanism adapted to be actuated by the operator for simultaneously swinging the cutter and finger away from each other.
4. A- combination such as set forth in claim 3 in which the mechanism for swinging the cutter and finger comprises a beveled disc concentric with the axis of the rotary frame lyinnr between the finger and the journal bearing for the cutter and cooperating w1th beveled surfaces on the latter, and means for shifting said beveled disc along the line of' its axis.
5. The combination with a main frame, a clamp hinged thereon and adapted to grasp an insulated wire, and a spring normally holding said clamp in grasping position, of a rotatable frame journaled in the main frame with its axis of rotation in line with a wire held by the clamp, a rotatable cutting disc mounted on a shaft, a. journal bearing for said .shaft hinged to the rotatable frame so that the disc may swing toward or from a wire held in the clamp, a pinion on the other end of the shaft, a gear wheel having its axis in line with that of the'rotatable frame and meshing with the pinion, a pressure fin- 'ger hinged to the rotatable frame and opposite to lthe rotary cutter, springs tending to force the cutter and finger toward each other, a disc having a beveled edge mounted on a shaft concentric with the rotatable fra-me and wedged in between the finger and the hinged journal bearing for the cutting disc shaft, said beveled disc shaft being movable endwise, a spring tending to force this shaft in a direction to permit the cutter and linger to approach one another, a treadle operated mechanism adapted to push this shaft in the opposite direction and at the same time to swing the clamp out of grasping position, and means for revolving the rotatable frame positively, and also relatively t0 the above mentioned gear wheel.
MINER P. lVETMORE.
Witnesses Ron'r. VAN BRUNT, CLIFFORD TiTCHEN.