US3912899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Straightening device for wire electrode used in an electro-erosion machining apparatus
Assignee: Ateliers des Charmilles SA
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Filing: 1974-08-19
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Granted: 1975-10-14
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Expires: 1994-08-19
Abstract
Abstract A device for straightening a wire electrode fed through the machining zone between the electrode and a workpiece in an electro-erosion machining apparatus, comprising a heating and straightening zone having means for heating the wire while simultaneously placing it under traction. The wire is passed through the heating and straightening zone prior to passing through the machining zone, and means are provided for maintaining the wire under a greater traction while simultaneously maintaining its temperature at a lower temperature while passing through the machining zone.
Inventors
- 👤 Hans Lehmann
- 👤 Roger Girardin
- 👤 William Morf
- 👤 Roger Delpretti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:59
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/02; B23H7/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
An apparatus for electro-eroding a workpiece by means of a wire electrode continuously fed at a predetermined velocity to the machining zone between a workpiece and said wire electrode, said apparatus comprising means for straightening said wire electrode by passing said wire through a heating zone in which said wire electrode is heated prior to feeding said wire electrode to the machining zone, means for subjecting said wire electrode during passage through said heating zone to a predetermined traction, means for cooling said wire electrode prior to feeding it through said machining zone, and means for increasing the traction exerted on said wire electrode while passing through said machining zone.
Claim 2
Independent Claim
110 words
An apparatus for electro-eroding a workpiece by means of a wire electrode continuously fed at a predetermined velocity to the machining zone between a workpiece and said wire electrode, said apparatus comprising means for straightening said wire electrode by passing said wire through a heating zone in which said wire electrode is heated prior to feeding said wire electrode to the machining zone, means for subjecting said wire electrode during passage through said heating zone to a predetermined traction, means for cooling said wire electrode prior to feeding it through said machining zone, and means for increasing the traction exerted on said wire electrode while passing through said machining zone.
Claim 3
Dependent Claim
26 words
The apparatus of claim 1 wherein said wire is maintained in a substantially straight line while being fed from said heating zone to said machining zone.
Claim 4
Dependent Claim
73 words
The apparatus of claim 2 wherein means for longitudinally feeding said wire electrode are disposed beyond said machining zone, and further comprising first mechanical braking means disposed ahead of said heating zone and second mechanical braking means disposed ahead of said machining zone, wherein that the traction exerted on the wire electrode between said first and second braking means is less than the traction exerted on the wire electrode in said machining zone.
Claim 5
Dependent Claim
95 words
The apparatus of claim 2 wherein first feeding means are provided for said wire electrode beyond said machining zone, second feeding means are provided between said heating zone and said machining zone, and third feeding means are provided prior to said heating zone, said first, second and third feeding means being driven by a common motor, and means for driving said feeding means from said common motor arranged such that more traction is exerted on said wire electrode between said first and second feeding means than is exerted between said second and third feeding means.
Claim 6
Dependent Claim
20 words
The apparatus of claim 2 further comprising means for sizing said wire electrode disposed in advAnce of said heating zone.
Claim 7
Dependent Claim
54 words
The apparatus of claim 5 wherein said sizing means comprises a drawing die, means for feeding said wire electrode disposed beyond said drawing die, and means for adjusting the speed of feeding of said wire by said means as a function of the length of a wire loop formed ahead of said heating zone.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |