Patent US3595106A successfully refreshed from Google Patents.
US3595106A
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Digital position control device for apparatus such as machine-tools having a rotatable member
Assignee: TIM SpA
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Filing: 1968-09-16
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Granted: 1971-07-27
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Expires: 1988-09-16
Abstract
Abstract A numerical control device for machine-tool operation in which a tool or workpiece, or both, must be both translated linearally and rotated. The two motions are correlated as necessary, for instance, to cut a screw thread.
Inventors
- 👤 Piero Pomella
- 👤 Luciano Lauro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:22
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/182; G05B19/186; Y; Y10; Y10T; Y10T82/00; Y10T82/10; Y10T82/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
264 words
A digital control device for positioning a movable member on an equipment, such as a machine tool, along at least one linear axis and around a rotary axis having an interpolating means for computing increments of position coordinates representing the displacement along the linear axes and around the rotary axis in successive cycles of operation and for supplying information to several mechanisms on each said linear axis causing said servomechanisms to carry out a positioning operation, comprising, program means for communicating signals to said interpolating means corresponding to the discontinuous position orders, said discontinuous position orders comprising extreme coordinates of the path segment to be traveled along each said linear axis, displacement increments along each said linear axis for each revolution of the movable member around said rotary axis and a constant rotational speed of said movable member around said rotary axis, rotary position measuring means for comparing the present position of said movable member relative to said rotary axis with a position computed by said interpolating means, said interpolating means being coupled to an input of said position measuring means so as to communicate thereto a signal corresponding to said computer position, said position measuring means supplying an output error signal corresponding to the error between said compared positions, and means coupling said output error signal to said interpolating means for controlling the computing operation thereof in a manner such that the amount of displacement increment of said movable member computed in each interpolating cycle for each of said linear axes per revolution around the rotary axis equals the corresponding programmed displacement increment.
Claim 2
Dependent Claim
264 words
A digital control device for positioning a movable member on an equipment, such as a machine tool, along at least one linear axis and around a rotary axis having an interpolating means for computing increments of position coordinates representing the displacement along the linear axes and around the rotary axis in successive cycles of operation and for supplying information to several mechanisms on each said linear axis causing said servomechanisms to carry out a positioning operation, comprising, program means for communicating signals to said interpolating means corresponding to the discontinuous position orders, said discontinuous position orders comprising extreme coordinates of the path segment to be traveled along each said linear axis, displacement increments along each said linear axis for each revolution of the movable member around said rotary axis and a constant rotational speed of said movable member around said rotary axis, rotary position measuring means for comparing the present position of said movable member relative to said rotary axis with a position computed by said interpolating means, said interpolating means being coupled to an input of said position measuring means so as to communicate thereto a signal corresponding to said computer position, said position measuring means supplying an output error signal corresponding to the error between said compared positions, and means coupling said output error signal to said interpolating means for controlling the computing operation thereof in a manner such that the amount of displacement increment of said movable member computed in each interpolating cycle for each of said linear axes per revolution around the rotary axis equals the corresponding programmed displacement increment.
Claim 3
Dependent Claim
184 words
A digital control device according to claim 1, wherein the programmed displacement increment is furnished by the program unit to the memory of the interpolating unit as a minimum displacement increment for a given minimum rotary increment per interpolating cycle and wherein the interpolating unit is arranged in a synchronizing phase, during which the said computed displacement for each linear axis is not incremented, to multiply the said minimum increments by the same amounts until the multiplied minimum rotary increment reaches a predetermined value, and then to accumulate rotary position increments increasing by an amount equal to said predetermined value in each interpolating cycle until the rotary displacement increment computed in each interpolating cycle corresponds to the actual programmed speed of rotation of the member rotating about the rotary axis and the double of the rotary displacement computed for the rotary coordinate is equal to the rotary displacement actually covered by said rotating member, and wherein the interpolating unit is thereafter arranged to increment the computed displacement for each said linear axis by the corresponding value attained by the displacement increment per interpolating cycle.
Claim 4
Dependent Claim
65 words
Digital positIon control device according to claim 1, including means providing thresholds for the error fed by the output of the rotary position measuring transformer, said interpolating means being operable upon the error exceeding one of said thresholds to modify the amount of the position increment accumulated in each interpolation cycle in order to follow the speed of said movable member about said rotary axis.
Claim 5
Dependent Claim
48 words
Digital control device according to claim 3 in which said threshold means provides at least one positive and at least one negative threshold indicating the direction and the amount of the error of the computed rotary position with respect to the proper rotational position of the movable member.
Claim 6
Independent Claim
178 words
The method of continuously positioning a movable member of equipment, such as a machine tool, along at least one linear axis and around a rotary axis, comprising the steps of: providing a program containing discontinuous position orders for said movable member, said discontinuous position orders including the extreme coordinates of path segments to be traveled along each said linear axis, the displacement increments along each said linear axis for each rotation of the movable member about said rotary axis, and the constant rotational speed of said movable member about said rotary axis, rotating said movable member around said rotary axis at a constant rotational speed, interpolating on the bases of said program in successive interpolation cycles to compute displacement increments for each of said linear axes such as to maintain said linear axes in synchronism with the constant rotational speed and the rotary displacement of said rotary member, and moving said member along each of the said linear axes in accordance with the linear displacement increments computed during the interpolating step conjointly with the said rotary position increments.
Claim 7
Independent Claim
178 words
The method of continuously positioning a movable member of equipment, such as a machine tool, along at least one linear axis and around a rotary axis, comprising the steps of: providing a program containing discontinuous position orders for said movable member, said discontinuous position orders including the extreme coordinates of path segments to be traveled along each said linear axis, the displacement increments along each said linear axis for each rotation of the movable member about said rotary axis, and the constant rotational speed of said movable member about said rotary axis, rotating said movable member around said rotary axis at a constant rotational speed, interpolating on the bases of said program in successive interpolation cycles to compute displacement increments for each of said linear axes such as to maintain said linear axes in synchronism with the constant rotational speed and the rotary displacement of said rotary member, and moving said member along each of the said linear axes in accordance with the linear displacement increments computed during the interpolating step conjointly with the said rotary position increments.
Claim 8
Dependent Claim
44 words
The method defined in claim 5 wherein said interpolating step is accomplished in such a manner as to compute an increment for each linear axis during a single revolution of said member which is equal to the corresponding displacement increment provided by said program.
References Cited (Backward Citations)
US3174367A
Cited
US3381557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |