Electric heating – Metal heating – Cutting or disintegrating
Patent
1989-04-13
1990-05-29
Leung, Philip H.
Electric heating
Metal heating
Cutting or disintegrating
198628, 226172, B23H 702, B65G 1514, B65H 5100
Patent
active
049298097
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a wire drive apparatus for use in a wire-cut electric discharge machine, and more particularly, to a wire drive apparatus which is capable of effecting smooth wire extension by the use of a single drive source, and of avoiding wear of belts and variation in wire feed speed.
BACKGROUND ART
Typically, a conventional wire-cut electric discharge machine comprises a wire feed/drive system shown in FIG. 5, and is so arranged as to generate electric discharge between a wire 1 and a workpiece 106 for electric discharge machining while the wire 1 wound around a wire reel 101 rotatably supported by a column 100 is delivered by means of the wire feed/drive system. This wire feed/drive system comprises a brake device 102 consisting of a brake shoe and a brake pinch roller, a guide roller 103, upper and lower guide sections 104, 105, and upper and lower belt sections 108, 107 for wire feed. The lower belt section 107 is comprised of rollers r1-r3 and a belt stretched between these rollers, and the upper belt section 108 is comprised of rollers r4-r6 and a belt stretched therebetween, the roller r6 being coupled to a motor M2. Further, the wire feed/drive system comprises a wire guide 112, a feed roller 109 connected to a motor M1, and a pinch roller 110 disposed in urged contact with this roller.
During wire extension, the wire 1 is fed manually or by means of an automatic wire extension apparatus (not shown) from the upper guide section 104 toward an initial hole or the like, not shown, formed in the workpiece 106, and is then directed from the initial hole toward the upper and lower belt sections 108, 107 through a wire feed path in the lower guide section 105. Further, the wire is delivered under a condition that it is held between the belts of the belt sections which move with rotation of the motor M2, to be held between the feed roller 109 and the pinch roller 110 after passing the wire guide 112. After completion of wire extension in this manner, electric discharge machining is started, with the feed roller 109 and the upper belt section 108 driven by the motors M1, M2, respectively, so as to deliver the wire 1 held between the roller 109 and the pinch roller 110 and between the belts of the upper and lower belt sections 108, 107. The used wire then is cast away into a wire recover box 111.
As explained above, according to the conventional wire feed/drive system, the wire 1 is driven by the rollers 109, 110 and by the belt sections 108, 107 during electric discharge machining. Moreover, in order to feed the wire 1 in a stable manner, the motors M1, M2, associated with these rollers and the belt sections, respectively, are rotated in synchronism with each other. Further, the belt of each belt section is constructed so that two opposite ends thereof are connected in an endless manner, and hence a stepped portion is formed at the junction. Therefore, the belt is liable to rotate unevenly. Thus, even though the feed roller 109 is rotated accurately at a predetermined speed during the electric discharge machining, the wire feed speed is liable to vary, thereby possibly entailing variation in electric discharge machining characteristics. Moreover, since the wire and the belts are held in contact with one another, the belts can be easily worn away, and the wire can vibrate.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a wire drive apparatus for use in a wire-cut electric discharge machine, which is capable of effecting wire extension smoothly by the use of a single drive source, and preventing wear of a belt, variation in wire feed speed and occurrence of wire vibration.
In order to achieve the above-mentioned object, a wire drive apparatus according to the present invention, comprises: a pair of belt sections for wire feed each having a belt, the pair of belt sections being arranged to be movable relative to each other between a wire extension operation position where the belts are in urged contact with each other and a retracted p
REFERENCES:
patent: 3610500 (1971-10-01), Brown
patent: 4652716 (1987-03-01), Schneider et al.
patent: 4814572 (1989-03-01), Aso et al.
Arakawa Yasuo
Aso Toshiyuki
Evans Geoffrey S.
Leung Philip H.
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