Patent US3872365A successfully refreshed from Google Patents.
US3872365A
Expired / Lapsed
US
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Methods of and devices for braking and indexing the spindle of a machine tool rotating at high speed
Assignee: Renault SA
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Filing: 1973-09-20
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Granted: 1975-03-18
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Expires: 1993-09-20
Abstract
Abstract A method of braking and indexing a mechanical member rotating at high speed, notably a machine tool spindle, wherein the starting point of the high-speed indexing phase is triggered and the braking phase is monitored at least partially according to an optimum velocity/space curve of parabolic shape; this invention further comprises a device for carrying out this method.
Inventors
- 👤 Jean-Pierre Vignaud
- 👤 Claude Sebire
- 👤 Pierre Riss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:54
CPC Classifications
B; B23; B23Q; B23Q15/00; B23Q15/20; B23Q15/22; B23Q15/26; F; F16; F16D; F16D71/00; G; G05; G05B; G05B2219/00; G05B2219/30; G05B2219/43; G05B2219/43006
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
A method of braking and indexing a mechanical member rotating at high speed comprising triggering the starting point of a Highspeed indexing phase, and monitoring a braking action at least partially according to an optimum velocity/space curve of parabolic shape during three successive phases, the first phase being along a substantially linear section of a velocity/time curve corresponding to the velocity-space curve of parabolic shape having a numerical or digital definition, the second phase being along a linear velocity/time curve defined by a function generator and released below a certain threshold of said first phase, and the third phase being a final locking phase started in response to a predetermined final numerical information of said numerical or digital definition.
Claim 2
Independent Claim
119 words
A method of braking and indexing a mechanical member rotating at high speed comprising triggering the starting point of a Highspeed indexing phase, and monitoring a braking action at least partially according to an optimum velocity/space curve of parabolic shape during three successive phases, the first phase being along a substantially linear section of a velocity/time curve corresponding to the velocity-space curve of parabolic shape having a numerical or digital definition, the second phase being along a linear velocity/time curve defined by a function generator and released below a certain threshold of said first phase, and the third phase being a final locking phase started in response to a predetermined final numerical information of said numerical or digital definition.
Claim 3
Dependent Claim
246 words
A braking and indexing device for a mechanical member rotating at high speed comprising a first pick-up to receive multiple pulses transmitted as a function of the angular position of said mechanical member, a second pick-up for receiving braking-action starting pulses transmitted in a predetermined angular position of said mechanical member, a preselectable digit-state down-counter to which said first pick-up is connected, a count-down permitting circuit responsive to a braking order, said count-down permitting circuit being interposed between said second pick-up and said digit-state down-counter for permitting the count down only from a specific pulse, a D/A or digit/analog converter for converting the output signals of said digit-state down-counter, an analog square-root extractor, connected to the output of said digit-state down-counter, for producing a first signal representing a preset speed of the mechanical member, a threshold device responsive to a predetermined threshold of said first signal during its linear evolution and co-acting with a linear-function generator for emitting a second signal representing the preset speed of said mechanical member, switching means responsive to said threshold device for transmitting in succession said first and second signals to a comparator to which a signal generator which generates signals representing the actual speed of said mechanical member is connected, a spindle braking control device responsive to an error signal transmitted from said comparator, and a comparator forcing circuit having a maximum braking control state responsive to a predetermined numerical state of the final count down of said digit-state down-counter.
Claim 4
Dependent Claim
246 words
A braking and indexing device for a mechanical member rotating at high speed comprising a first pick-up to receive multiple pulses transmitted as a function of the angular position of said mechanical member, a second pick-up for receiving braking-action starting pulses transmitted in a predetermined angular position of said mechanical member, a preselectable digit-state down-counter to which said first pick-up is connected, a count-down permitting circuit responsive to a braking order, said count-down permitting circuit being interposed between said second pick-up and said digit-state down-counter for permitting the count down only from a specific pulse, a D/A or digit/analog converter for converting the output signals of said digit-state down-counter, an analog square-root extractor, connected to the output of said digit-state down-counter, for producing a first signal representing a preset speed of the mechanical member, a threshold device responsive to a predetermined threshold of said first signal during its linear evolution and co-acting with a linear-function generator for emitting a second signal representing the preset speed of said mechanical member, switching means responsive to said threshold device for transmitting in succession said first and second signals to a comparator to which a signal generator which generates signals representing the actual speed of said mechanical member is connected, a spindle braking control device responsive to an error signal transmitted from said comparator, and a comparator forcing circuit having a maximum braking control state responsive to a predetermined numerical state of the final count down of said digit-state down-counter.
Claim 5
Dependent Claim
20 words
A braking and indexing device according to claim 2, wherein said linear function generator comprises an adder and an integrator.
Claim 6
Dependent Claim
25 words
A braking and indexing device according to claim 2, wherein said comparator forcing circuit comprises an adder interposed between said switching means and said comparator.
Claim 7
Dependent Claim
16 words
A braking and indexing device according to claim 2 wherein said mechanical member comprises a spindle.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |