Insulation stripping apparatus

Claim 1

Apparatus for removing a selected length of the insulation from along the run of a roll of insulated wire to leave undisturbed insulation on either side of such length and to expose a corresponding length of underlying wire, such corresponding length being greater than the diameter of the insulated wire, such apparatus comprising: (a) a stripping station including: (i) a first and a second electrical heating element, each one having a length substantially equal to the selected length of insulation to be removed and a cross-sectional shape substantially corresponding to one-half of the cross-sectional shape of the insulated wire; (ii) movable mounting means frictionally engaging the first and the second electrical heating elements to position such elements on opposite halves of the insulated wire around the selected length of the insulation to be removed and for providing electrical connections to such elements; (iii) means for periodically actuating the mounting means to cause the first and the second electrical heating elements to engage opposite halves of each selected length of the insulation to be removed for a selected period of time and then to retract the first and second heating elements; and (iv) means, operative during the selected period of time, for applying electrical power through the mounting means to the first and the second heating elements to decompose completely the insulation to be removed to expose a corresponding length of underlying wire with undisturbed insulation on either side of such length; and (b) means periodically operable to unroll predetermined lengths of the insulated wire from the roll thereof successively to position each selected length of the insulation to be removed between the first and the second electrical heating element.