Wire electrode supplying apparatus for wire electric discharge machine

• US 5,036,174 A
• Filed: 04/20/1990
• Issued: 07/30/1991
• Est. Priority Date: 04/28/1989
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Iwasaki, Takeshi, Sakai, Akihiro, Yatomi, Takeshi
• Primary Examiner(s): Evans, Geoffrey S.
• Application Number:
  US07/511,702
• Time in Patent Office: 466 Days
• Field of Search: 219/69.12, 219/69.14, 219/69.13
• US Class Current: 219/69.12
• CPC Class Codes: B23H 7/10 Supporting, winding or electrical connection of wire-electrode
• CPC Class Codes: B23H 7/102 Automatic wire threading

Abstract

A wire electrode supplying apparatus for a wire electric discharge machine to effect the machining of a workpiece by inserting a wire electrode through the workpiece and allowing electric discharge to take place between the workpiece and the wire electrode. In this apparatus, a wire electrode feeding section is provided for inserting the wire electrode through the workpiece, as well as a feeding-side guide section and a receiving-side guide section are provided with the workpiece placed therebetween for the positioning of the wire electrode. The wire electrode is formed of a small-diameter wire, and the feeding-side guide section and the receiving side guide section are respectively provided with small openings for constraining the direction of its movement. The passage of the wire electrode through the small openings is aided by reducing the speed of feeding the wire electrode when the wire electrode passes through the small openings. A vertically movable jet nozzle is provided for allowing a working fluid to be jetted from the vicinity of the feeding-side guide section toward the receiving-side guide section so that the wire electrode after passing through the feeding-side guide section heads toward the receiving-side guide section. By starting the jetting of the working fluid after passing through the jet nozzle, the wire electrode is guided positively.

Claims

1. A wire electrode supplying apparatus for a wire electric discharge machine, comprising:

a feeding section for feeding a wire electrode;

a feeding-side guide section through which the wire electrode fed from said feeding section is passed through and which is adapted to constrain the direction of movement of the wire electrode;

a receiving-side guide section for guiding the wire electrode, said receiving-side guide section being disposed in such a manner as to oppose said feeding-side guide section, and the wire electrode fed from said feeding-side guide section being passed through said receiving-side guide section;

a feeding amount detecting means for detecting an amount of the wire electrode fed from said feeding section;

a jet nozzle for constraining the direction of movement, toward said receiving-side guide section, of the wire electrode fed from said feeding-side guide section, as a jet of working fluid flows toward said receiving-side guide section; and

control means for controlling the supply of the jet to said jet nozzle in correspondence with the detected result of said feeding amount detecting means.

2. A wire electrode supplying machine for a wire electric discharge machine according to claim 1, wherein said control means ascertains the position of a tip of the wire electrode on the basis of the detected result of said feeding amount detecting means and allows the jetting of the working fluid to be started after the tip of the wire electrode passes through said jet nozzle.

3. A wire electrode supplying machine for a wire electric discharge machine according to claim 2, wherein said jet nozzle is movable in the direction of feeding of the wire electrode by means of hydraulic pressure of the working fluid jetted, and said control means allows the jetting of the working fluid to be started when the tip of the wire electrode has passed beyond the position of said jet nozzle located after its movement.

4. A wire electrode supplying machine for a wire electric discharge machine according to claim 3, further comprising a working fluid injection nozzle disposed forwardly of said jet nozzle in the direction of feeding of the wire electrode, and said control means allows the jetting of the working fluid to be started when the tip of the wire electrode is located between the position of said nozzle after movement thereof and the position of said working fluid injection nozzle.

5. A wire electrode supplying machine for a wire electric discharge machine according to claim 1, wherein said feeding section has a roller for feeding the wire electrode as said roller is brought into contact with the wire electrode and rotates, and said feeding amount detecting means includes a rotary encoder for outputting a pulse signal in correspondence with the rotation of said roller.

6. A wire electrode supplying machine for a wire electric discharge machine according to claim 5, wherein said feeding amount detecting means includes a counter for counting the number of pulses outputted from said rotary encoder and a comparator for comparing the counted result of said counter with a predetermined value.

7. A wire electrode supplying machine for a wire electric discharge machine according to claim 1, wherein said feeding section has a belt for feeding the wire electrode as said belt is brought into contact with the wire electrode and rotates and a pulley for moving said belt, and said feeding amount detecting means includes a rotary encoder for outputting a pulse signal in correspondence with the rotation of said pulley.

8. A wire electrode supplying machine for a wire electric discharge machine according to claim 1, wherein said feeding section has a belt on which optically detectable marks are provided at predetermined intervals and which is adapted to feed the wire electrode as said belt is brought into contact with the wire electrode and rotates, and said feeding amount detecting means includes a photosensor for optically detecting the marks provided on the belt at the predetermined intervals.

9. A wire electrode supplying apparatus for a wire electric discharge machine, comprising:

a feeding section for feeding, a wire electrode;

a feeding-side guide section through which the wire electrode fed from said feeding section is passed through and which is adapted to constrain the direction of movement of the wire electrode;

a receiving-side guide section for guiding the wire electrode, said receiving-side guide section being disposed in such a manner as to oppose said feeding-side guide section, and the wire electrode fed from said feeding-side guide section being passed through said receiving-side guide section;

a feeding amount detecting means for detecting an amount of the wire electrode fed from said feeding section;

a jet nozzle for constraining the direction of movement, toward said receiving-side guide section, of the wire electrode fed from said feeding-side guide section, as a jet of working fluid flows toward said receiving-side guide section; and

control means for controlling the speed of feeding the wire electrode in said feeding section in correspondence with the detected result of said feeding amount detecting means.

10. A wire electrode supplying machine for a wire electric discharge machine according to claim 9, wherein said feeding-side guide section has at its tip a small opening for positioning the wire electrode, and said control means ascertains the position of the tip of the wire electrode on the basis of the detected result of said feeding amount detecting means, and lowers the speed of feeding the wire electrode immediately before the tip of the wire electrode reaches said small opening in said feeding-side guide section, and increases the speed of feeding the wire electrode immediately after the tip of the wire electrode passes said small opening.

11. A wire electrode supplying machine for a wire electric discharge machine according to claim 10, wherein said receiving-side guide section has at its tip a small opening for positioning the wire electrode, and said control means ascertains the position of the tip of the wire electrode on the basis of the detected result of said feeding amount detecting means, and lowers the speed of feeding the wire electrode immediately before the tip of the wire electrode reaches said small opening in said receiving-side guide section, and increases the speed of feeding the wire electrode immediately after the tip of the wire electrode passes said small opening.

12. A wire electrode supplying machine for a wire electric discharge machine according to claim 9, wherein said receiving-side guide section has at its tip a small opening for positioning the wire electrode, and said control means ascertains the position of the tip of the wire electrode on the basis of the detected result of said feeding amount detecting means, and lowers the speed of feeding the wire electrode immediately before the tip of the wire electrode reaches said small opening in said receiving-side guide section, and increases the speed of feeding the wire electrode immediately after the tip of the wire electrode passes said small opening.

13. A wire electrode supplying machine for a wire electric discharge machine according to claim 9, wherein said feeding section has a roller for feeding the wire electrode as said roller is brought into contact with the wire electrode and rotates, and said feeding amount detecting means includes a rotary encoder for outputting a pulse signal in correspondence with the rotation of said roller.

14. A wire electrode supplying machine for a wire electric discharge machine according to claim 13, wherein said feeding amount detecting means further includes a counter for counting the number of pulses outputted from said rotary encoder and a comparator for comparing the counted result of said counter with a predetermined value.

15. A wire electrode supplying machine for a wire electric discharge machine according to claim 9, wherein said feeding section has a belt for feeding the wire electrode as said belt is brought into contact with the wire electrode and rotates and a pulley for moving said belt, and said feeding amount detecting means includes a rotary encoder for outputting a pulse signal in correspondence with the rotation of said pulley.

16. A wire electrode supplying machine for a wire electric discharge machine according to claim 9, wherein said feeding section has a belt on which optically detectable marks are provided at predetermined intervals and which is adapted to feed the wire electrode as said belt is brought into contact with the wire electrode and rotates, and said feeding amount detecting means includes a photosensor for optically detecting the marks provided on the belt at the predetermined intervals.

17. A wire electrode supplying apparatus for a wire electric discharge machine, comprising:

a feeding section for feeding a wire electrode;

a feeding-side guide section through which the wire electrode fed from said feeding section is passed through and which is adapted to constrain the direction of movement of the wire electrode;

a receiving-side guide section for guiding the wire electrode, said receiving-side guide section being disposed in such a manner as to oppose said feeding-side guide section, and the wire electrode fed from said feeding-side guide section being passed through said receiving-side guide section;

a feeding amount detecting means for detecting an amount of the wire electrode fed from said feeding section;

a jet nozzle for constraining the direction of movement, toward said receiving-side guide section, of the wire electrode fed from said feeding-side guide section, as a jet of working fluid flows toward said receiving-side guide section; and

control means for controlling the speed of feeding the wire electrode in said feeding section and controlling the supply of the jet to said jet nozzle in correspondence with the detected result of said feeding amount detecting means.

18. A wire electrode supplying machine for a wire electric discharge machine according to claim 17, wherein said feeding section has a roller for feeding the wire electrode as said roller is brought into contact with the wire electrode and rotates, and said feeding amount detecting means includes a rotary encoder for outputting a pulse signal in correspondence with the rotation of said roller, a counter for counting the number of pulses outputted from said rotary encoder, and a comparator for comparing the counted result of said counter with a predetermined value.

19. A wire electrode supplying machine for a wire electric discharge machine according to claim 17, wherein said feeding section has a belt for feeding the wire electrode as said belt is brought into contact with the wire electrode and rotates and a pulley for moving said belt, and said feeding amount detecting means includes a rotary encoder for outputting a pulse signal in correspondence with the rotation of said pulley.

20. A wire electrode supplying machine for a wire electric discharge machine according to claim 17, wherein said feeding section has a belt on which optically detectable marks are provided at predetermined intervals and which is adapted to feed the wire electrode as said belt is brought into contact with the wire electrode and rotates, and said feeding amount detecting means includes a photosensor for optically detecting the marks provided on the belt at the predetermined intervals.