US3887782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
EDM electrode vibration control system
Assignee: ELTEE PULSITRON ENTIRE
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Filing: 1973-10-12
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Granted: 1975-06-03
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Expires: 1993-10-12
Abstract
Abstract An EDM electrode is vibrated relative to a workpiece by modulating the servo signal which maintains an optimum spark gap spacing between the electrode and workpiece. The modulating signal is derived from a rectified, sinusoidal oscillating signal of sonic frequency limiting the vibratory stroke of the electrode so as to prevent any decrease in the gap spacing from that of the optimum spark gap.
Inventors
- 👤 Leonard M Wohlabaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:21
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/14; B23H7/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
149 words
In combination with a servo control system for effecting relative displacement between a workpiece and an electrode as a function of the spacing therebetween to maintain an optimum spark gap; a source of electrical oscillating signals, vibration generating means connecting said source to the servo control system for modulating said relative displacement between the electrode and workpiece with a vibratory motion of preselected frequency and amplitude, and stroke control means connected to the vibration generating means for substantially preventing any reduction in the spacing between the workpiece and the electrode from a distance equal to that of the optimum spark gap, said source of oscillating signals comprising a signal generator producing a sinusoidal output, signal comparator means connected to the signal generator for regulating the output thereof at a preselected amplitude, and filter means connecting the signal comparator to the signal generator for predetermining the frequency of the output.
Claim 2
Dependent Claim
149 words
In combination with a servo control system for effecting relative displacement between a workpiece and an electrode as a function of the spacing therebetween to maintain an optimum spark gap; a source of electrical oscillating signals, vibration generating means connecting said source to the servo control system for modulating said relative displacement between the electrode and workpiece with a vibratory motion of preselected frequency and amplitude, and stroke control means connected to the vibration generating means for substantially preventing any reduction in the spacing between the workpiece and the electrode from a distance equal to that of the optimum spark gap, said source of oscillating signals comprising a signal generator producing a sinusoidal output, signal comparator means connected to the signal generator for regulating the output thereof at a preselected amplitude, and filter means connecting the signal comparator to the signal generator for predetermining the frequency of the output.
Claim 3
Dependent Claim
27 words
The combination of claim 1 wherein said stroke control means includes current limiting means connecting the source to the servo control system for rectifying the oscillating signal.
Claim 4
Dependent Claim
74 words
The combination of claim 2 wherein said servo control system includes means connected to the electrode and the workpiece for producing a control signal reflecting the spacing of the spark gap, servo motor means connected to the electrode for displacement thereof, and signal converter having an output connected to the servo motor means and a pair of inputs respectively connected to the source through the stroke control means and to the control signal means.
Claim 5
Dependent Claim
21 words
The combination of claim 3 wherein said stroke control means includes means for rectifying the regulated output of the signal generator.
Claim 6
Dependent Claim
122 words
In combination with a servo control system for effecting relative displacement between a workpiece and an electrode as a function of the spacing therebetween to maintain an optimum spark gap; a source of electrical oscillating signals, vibration generating means connecting said source to the servo control system for modulating said relative displacement between the electrode and workpiece with a vibratory motion of preselected frequency and amplitude, and stroke control means connected to the vibration generating means for substantially preventing any reduction in the spacing between the workpiece and the electrode from a distance equal to that of the optimum spark gap, said stroke control means including current limiting means connecting the source to the servo control system for rectifying the oscillating signal.
Claim 7
Dependent Claim
122 words
In combination with a servo control system for effecting relative displacement between a workpiece and an electrode as a function of the spacing therebetween to maintain an optimum spark gap; a source of electrical oscillating signals, vibration generating means connecting said source to the servo control system for modulating said relative displacement between the electrode and workpiece with a vibratory motion of preselected frequency and amplitude, and stroke control means connected to the vibration generating means for substantially preventing any reduction in the spacing between the workpiece and the electrode from a distance equal to that of the optimum spark gap, said stroke control means including current limiting means connecting the source to the servo control system for rectifying the oscillating signal.
Claim 8
Dependent Claim
122 words
In combination with a servo control system for effecting relative displacement between a workpiece and an electrode as a function of the spacing therebetween to maintain an optimum spark gap; a source of electrical oscillating signals, vibration generating means connecting said source to the servo control system for modulating said relative displacement between the electrode and workpiece with a vibratory motion of preselected frequency and amplitude, and stroke control means connected to the vibration generating means for substantially preventing any reduction in the spacing between the workpiece and the electrode from a distance equal to that of the optimum spark gap, said stroke control means including current limiting means connecting the source to the servo control system for rectifying the oscillating signal.
Claim 9
Dependent Claim
122 words
In combination with a servo control system for effecting relative displacement between a workpiece and an electrode as a function of the spacing therebetween to maintain an optimum spark gap; a source of electrical oscillating signals, vibration generating means connecting said source to the servo control system for modulating said relative displacement between the electrode and workpiece with a vibratory motion of preselected frequency and amplitude, and stroke control means connected to the vibration generating means for substantially preventing any reduction in the spacing between the workpiece and the electrode from a distance equal to that of the optimum spark gap, said stroke control means including current limiting means connecting the source to the servo control system for rectifying the oscillating signal.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |