Automatic wire-threading device for electroerosion machines
OwnerJose M. Onandiainventor
Life of this patent
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Abstract
An automatic wire threading device with a threading mechanism having a first free wheel and a second free wheel each having an inner traction surface and an outer traction surface. When a central processing unit (4) detects wire breakage, drives a pneumatic cylinder (25) against the action of a spring (22) that separates the free wheels so that pivoting arm (23) positions the wheel carried by it against the other wheel. The central processing unit then orders rotation of a threading motor which by a gear train drives the wire. A cutting mechanism cuts the wire to improve threading. A guide water circuit is provided downstream of the cutting mechanism.
Claims5
Automatic wire-threading device for electroerosion machines having an upper head and a lower head and a wire that travels from the upper head to the lower head, characterized in that said device comprises a traction threading mechanism comprising:
- a) a first free wheel and a second free wheel, each of the wheels having an inner traction surface and an outer loose surface;
- b) a pivoting arm bearing the second wheel;
- c) a fluid mechanical means for reversibly moving the pivoting arm and the second wheel from a first position to a second position in which the second wheel is in contact with the first wheel for dragging said wire;
- d) a threading motor which, under threading conditions, drives the first and second wheels by a gear train;
- e) a cutting mechanism and a fine-jet guide water circuit;
- f) a central processing unit controlling the pivoting arm, the threading motor, and the cutting mechanism.
Dependencies are inferred from the claim text.