Wire-cut electrical discharge machine having wire electrode cutting device
First Claim
1. A wire-cut electrical discharge machine, comprising:
- a fixed frame;
a moving plate pivotally mounted to said fixed frame;
a wire guide mounted on said moving plate and disposed between a supply of the wire electrode and a workpiece, the wire guide introducing the wire electrode into a processing passage in which the wire electrode moves toward the workpiece;
a cutting means disposed between the supply of the wire electrode and the workpiece for cutting off the unusable length of the wire electrode;
a disposal portion for storing a scrap wire electrode which is cut off by the cutting means; and
a moving means for pivotally moving the moving plate so as to selectively position the wire guide in line with one of the processing passage and a disposal passage through which the scrap wire electrode moves to the disposal portion.
1 Assignment
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Accused Products
Abstract
A wire cutting mechanism for smoothly cutting a broken cutting wire of a wire electrode cutting device that positively guides the scrape position of the wire electrode to a disposal passage. The cutting mechanism has a feed mechanism positioned above a wire cutter to control the feed of the wire electrode during the cutting operation. Both the cutter and the feed mechanism are mounted on a plate that is displaceable in order to align the wire electrode feed with the disposal passage when the wire electrode has been broken and must be cut to ensure accurate feeds the cutting zone. The cutting mechanism, when positioned for cutting, feeds the broken end of the electrode wire for a predetermined time so that the wire electrode enters the disposal passage prior to cutting.
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Citations
21 Claims
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1. A wire-cut electrical discharge machine, comprising:
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a fixed frame; a moving plate pivotally mounted to said fixed frame; a wire guide mounted on said moving plate and disposed between a supply of the wire electrode and a workpiece, the wire guide introducing the wire electrode into a processing passage in which the wire electrode moves toward the workpiece; a cutting means disposed between the supply of the wire electrode and the workpiece for cutting off the unusable length of the wire electrode; a disposal portion for storing a scrap wire electrode which is cut off by the cutting means; and a moving means for pivotally moving the moving plate so as to selectively position the wire guide in line with one of the processing passage and a disposal passage through which the scrap wire electrode moves to the disposal portion.
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2. A method for cutting a wire electrode of an electrical discharge cutting machine, comprising the steps of:
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determining a breakage in the wire electrode; rewinding the wire electrode toward a supply spool; detecting when a broken end of the wire electrode has passed a predetermined point; stopping rewinding of the wire electrode; positioning a feed path of the wire electrode to be aligned with a disposal portion by displacement of a moving plate having a wire guide mounted thereon; feeding the wire electrode to a cutting position; and cutting off a damage portion of the wire electrode. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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9. An apparatus for cutting a wire electrode of an electrical discharge cutting machine, comprising:
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means for determining a breakage in the wire electrode; means for rewinding the wire electrode toward a supply spool; means for detecting when a broken end of the wire electrode has passed a predetermined point; means for stopping rewinding of the wire electrode; means for positioning a feed path of the wire electrode to be aligned with a disposal portion by displacement of a moving plate having a wire guide mounted thereon; means for feeding the wire electrode to a cutting position; and means for cutting off a damaged portion of the wire electrode. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An apparatus for cutting a wire electrode of an electrical discharge cutting machine, comprising:
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a fixed frame; an upstream wire guide mounted to said fixed frame; a moving plate pivotally mounted to said fixed frame; first feeding means mounted to said fixed frame between said upstream wire guide and said moving plate for engaging and feeding the wire electrode; cutting means mounted on said moving plate for cutting the wire electrode; a sensor mounted to said moving plate downstream, in the direction of wire electrode feed, of said cutting means; downstream wire guide means mounted to said moving plate for guiding the wire electrode; and moving means for pivotally moving said moving plate to position said downstream wire guide over one of a wire disposal portion and a feed passage to a workpiece cutting area. - View Dependent Claims (17, 18, 19, 20)
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21. A wire-cut electrical discharge machine comprising:
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a fixed frame; a moving plate movably mounted to said fixed frame; a wire guide mounted on said moving plate and disposed between a supply of the wire electrode and a workpiece, the wire guide introducing the wire electrode into a processing passage in which the wire electrode moves toward the workpiece; a cutting means disposed between the supply of the wire electrode and the workpiece for cutting off the unusable length of the wire electrode; a disposal portion for storing a scrap wire electrode which is cut off by the cutting means; and a moving means for moving the moving plate so as to selectively position the wire guide in line with one of the processing passage and a disposal passage through which the scrap wire electrode moves to the disposal portion.
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Specification