US3579073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spindle growth compensator
Assignee: Individual
•
Filing: 1970-05-20
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Granted: 1971-05-18
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Expires: 1990-05-20
Abstract
Abstract A device for automatically compensating for the expansion and contraction of the spindle of a machine tool due to different operating temperatures. A thermistor, impedance network is utilized to provide a corrective predetermined control signal to the spindle positioning control circuit.
Inventors
- 👤 Richard Johnstone
- 👤 Richard E Stobbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:42
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/33; G05B19/404; G05B2219/00; G05B2219/30; G05B2219/49; G05B2219/49206
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
164 words
In a device for sensing and compensating for the thermal induced dIsplacement of a movable component of a machine tool from a reference position; power means operably connected to activate said movable component in its movement; a positioning control system operably connected to supply a control signal to regulate the operation of said power means to effect accurate positioning of said movable component; a temperature compensation control selectively presettable to modify said control signal in response to a variation in temperature; an element in said temperature compensation control whose resistance changes with temperature, said element being disposed in said movable component and operable to change its resistance in response to changes in operating temperatures; and, means operably connected with said element and operating in combination therewith to modify the control signal to compensate for the displacement of the operating end of said positioning component of the machine tool from a reference point due to a variation in the operating temperature of the machine tool.
Claim 2
Dependent Claim
164 words
In a device for sensing and compensating for the thermal induced dIsplacement of a movable component of a machine tool from a reference position; power means operably connected to activate said movable component in its movement; a positioning control system operably connected to supply a control signal to regulate the operation of said power means to effect accurate positioning of said movable component; a temperature compensation control selectively presettable to modify said control signal in response to a variation in temperature; an element in said temperature compensation control whose resistance changes with temperature, said element being disposed in said movable component and operable to change its resistance in response to changes in operating temperatures; and, means operably connected with said element and operating in combination therewith to modify the control signal to compensate for the displacement of the operating end of said positioning component of the machine tool from a reference point due to a variation in the operating temperature of the machine tool.
Claim 3
Dependent Claim
12 words
A device according to claim 1, wherein said element is a thermistor.
Claim 4
Dependent Claim
64 words
A device according to claim 2, wherein said temperature compensation control in response to a variation in the operating temperature in the movable component operates to provide a corrective phase shift of the control signal to compensate for the displacement of the operating end of said movable component of the machine tool due to the variation in the operating temperature of the machine tool.
Claim 5
Dependent Claim
13 words
A device according to claim 3, wherein said means is a reactive component.
Claim 6
Dependent Claim
34 words
A device according to claim 4, including: an adjustable resistor connected to said reactive component and operative to modify said control signal a predetermined amount in response to a resistance change in said thermistor.
Claim 7
Dependent Claim
210 words
In a device for sensing and compensating for the displacement of the operating end of a movable component of a machine tool from a reference position wherein such displacement is due to temperature variations; power means operably connected to activate said movable component within its movement; a positioning control system operably connected to supply a control signal to regulate the operation of said power means to effect accurate positioning of said movable component; a temperature sensing means connected to sense the variations in the operating temperature of the component of the machine tool and the ambient temperature of the surroundings and operable to produce a predetermined differential signal to modify the operation of said positioning control system; a plurality of elements in said temperature sensing means whose resistance changes with temperature, said elements being disposed in said machine tool and operable to change its resistance in response to changes in operating and ambient temperatures; and, means operably connected to each of said elements and operating in combination therewith to modify the control signal to compensate for the displacement of the operating end of said movable component of the machine tool from a reference point due to a variation in the operating temperature of the machine tool over the ambient temperature.
Claim 8
Dependent Claim
210 words
In a device for sensing and compensating for the displacement of the operating end of a movable component of a machine tool from a reference position wherein such displacement is due to temperature variations; power means operably connected to activate said movable component within its movement; a positioning control system operably connected to supply a control signal to regulate the operation of said power means to effect accurate positioning of said movable component; a temperature sensing means connected to sense the variations in the operating temperature of the component of the machine tool and the ambient temperature of the surroundings and operable to produce a predetermined differential signal to modify the operation of said positioning control system; a plurality of elements in said temperature sensing means whose resistance changes with temperature, said elements being disposed in said machine tool and operable to change its resistance in response to changes in operating and ambient temperatures; and, means operably connected to each of said elements and operating in combination therewith to modify the control signal to compensate for the displacement of the operating end of said movable component of the machine tool from a reference point due to a variation in the operating temperature of the machine tool over the ambient temperature.
Claim 9
Dependent Claim
11 words
A device according to claim 6, wherein said elements are thermistors.
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |