Electric heating – Metal heating – Cutting or disintegrating
Patent
1984-01-05
1987-10-06
Pellinen, A. D.
Electric heating
Metal heating
Cutting or disintegrating
219 69D, B23H 702, B23H 110
Patent
active
046984763
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an automatic wire feeder for a wire cut electrical discharge machining apparatus. More particularly, it is concerned with an automatic wire feeder for a wire cut electrical discharge machining apparatus which reduces the load bearing on the wire during its automatic feeding, and ensures the successful automatic feeding of the wire for a long period of time.
BACKGROUND ART
A conventional automatic wire feeder for a wire cut electrical discharge machining apparatus is shown in FIG. 1.
A wire supply reel 1 is connected to a torque motor (not shown), so that a torque for reverse rotation may be given to the reel to provide a brake force which prevents the sagging of an electrode wire 2. A brake roller 3 is connected to an electromagnetic brake (not shown). A holding roller 4 is held against the brake roller 3 by a spring. The electrode wire 2 is held between the brake roller 3 and the holding roller 4, and is maintained at a constant tension without slipping. Numeral 5 denotes a direction changing roller. A positioning die 6 has an inside diameter which is slightly larger than the diameter of the electrode wire 2. A pinch roller 7 for wire feeding is rotated by a pinch roller motor 10 mounted on a vertically movable plate 9, only when the wire is automatically fed. A holding roller 8 for wire feeding is held by a spring against the roller 7. The electrode wire 2 is held between the rollers 7 and 8 so that it may be fed downwardly without slipping. The positioning die 6 holds the electrode wire 2 in position between the rollers 7 and 8.
The vertical movement of the vertically movable plate 9 is effected by the rotation of a ball screw 13 connected to a motor 11 by a coupling 12. The vertically movable plate 9 is provided on its reverse side not visible in the drawing with a ball nut which converts the rotation of the ball screw 13 to a linear vertical motion. The ball screw 13 has one end supported on a motor mounting base 15 attached to a vertical guide 14, while the other end of the ball screw 13 is supported by a bearing 16.
The vertical guide 14 guides the vertical movement of the vertically movable plate 9 so that it may accurately perform linear vertical motion.
A pipe guide 17 is secured to the vertically movable plate 9 by a guide fixing member 18. The pipe guide 17 is adapted for vertical movement with the vertically movable plate 9, and is supported by a bearing 19 so that it may not swing during its vertical movement. The pipe guide 17 has one end to which a die guide 20 is attached for supporting the electrode wire 2. The bearings 16 and 19, and the vertical guide 14 are attached to a fixed plate 21.
A motor 22 for cutting and a motor 23 for arm rotation are secured to a case 24. A wire cutting station comprises a wire cutter 25, a cutting arm 26, and a tray 27 for receiving any waste produced when the wire is cut. The case 24 and the tray 27 are mounted on the fixed plate 21. The case 24 and the wire cutter 25 will hereinafter be described in further detail.
The pipe guide 17 is held against a V-grooved plate 28 by a holding plate 29. The V-grooved plate 28 has a V-groove in which the pipe guide 17 is held in position. The V-grooved plate 28 is secured to a box 30 mounted on the fixed plate 21. The box 30 has a nozzle 33 through which a jet of a working fluid 31 is supplied to a working station 32.
The pipe guide 17 has three notches through which three pins 34 and 35 are brought into contact with the electrode wire 2 to supply electricity thereto. The electricity supplying pin 34 is secured to a movable plate 36 which is moved to the right so that the pin 34 may not contact the pipe guide 17 when the pipe guide is vertically moved. The pins 35 are secured to a movable plate 37, and movable to the left with the holding plate 29. The material 38 to be worked is placed on a table 39.
A lower die guide 40 and a lower electricity supplying die 41 are both secured to a box 42 which is supported on a lower arm 43. The box 42 has a nozzle 78 through which a je
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Yamamoto Masahiro
Yatomi Takeshi
Evans Geoffrey S.
Mitsubishi Denki & Kabushiki Kaisha
Pellinen A. D.
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