Gap voltage detector in a wire-cut electric discharge machine
First Claim
1. A gap voltage detector in wire-cut electric discharge machine, comprising:
- means for detecting a first voltage between a first conductor and a workpiece;
means for detecting a second voltage between said workpiece and a second conductor which is disposed in a position opposite said first conductor; and
means for detecting a gap voltage on the basis of the sum of the thus detected first and second voltages.
1 Assignment
0 Petitions
Accused Products
Abstract
A gap voltage detector in a wire-cut electric discharge machine is provided, which is capable of eliminating an adverse effect due to a variation in an electric discharge position, thereby detecting a gap voltage between a wire electrode and a workpiece in an accurate manner. An operational amplifier (11) of the gap voltage detector is supplied at one input terminal with the sum of a voltage between an upper conductor (4) and the workpiece detected by a voltage divider (R11, R12) and a voltage between a lower conductor (5) and the workpiece detected by another voltage divider (R21, R22), and is supplied at another input terminal through variable resistors (RV1, RV2) with an output from a detection coil (10) corresponding to a differentiation of the electric discharge current and an output from an integration circuit (12) corresponding to the electric discharge current, as a signal for correcting the voltage drop components attributable to the wire resistance and inductance between the conductors, to thereby generate the corrected sum by using the voltage drop components as a gap voltage.
4 Citations
2 Claims
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1. A gap voltage detector in wire-cut electric discharge machine, comprising:
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means for detecting a first voltage between a first conductor and a workpiece; means for detecting a second voltage between said workpiece and a second conductor which is disposed in a position opposite said first conductor; and means for detecting a gap voltage on the basis of the sum of the thus detected first and second voltages. - View Dependent Claims (2)
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Specification