US3757192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural stepping motor numerical feed control device
Assignee: Toyoda Koki KK
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Filing: 1971-01-04
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Granted: 1973-09-04
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Expires: 1991-01-04
Abstract
Abstract A numerical feed control device is disclosed in which a worktable is driven by a pair of pulse motors, each of which moves a different distance when actuated by a driving pulse. The two motors are mechanically coupled so that their respective movements are added together. A control system is provided for permitting the pulse motors to be selectively driven so that the resolution of the system can be adjusted, where resolution is defined as the movement of the work table for each driving pulse applied to the system. The control system includes decoding equipment for properly selecting resolution commands from input numerical instruction words, and a network of logic gates for appropriately driving the two pulse motors in response to a particular resolution command.
Inventors
- 👤 T Kawamata
- 👤 H Asano
- 👤 T Koide
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:44
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/40; G05B2219/00; G05B2219/30; G05B2219/34; G05B2219/34182; G05B2219/41; G05B2219/41264
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
196 words
A numerical feed control device comprising: at least one movable member slidably mounted on a machine tool; first and second pulse motors for moving said movable member, said first pulse motor having a first resolution and siad second pulse motor having a second resolution different from said first resolution, wherein resolution is defined as the distance of movement of said movable member for each pulse applied to one of said motors; engaging means for operatively engaging said pulse motors with said movable member; and, a control circuit connected to said pulse motors for controlling the rotation thereof, said control circuit comprising first control means for synchronously rotating both said pulse motors in one direction, second control means for selectively rotating either one of said pulse motors in one direction and stopping the other thereof, and third control means for rotating one of said pulse motors in said one direction and for synchronously rotating the other thereof in the reverse direction, whereby four separate resolutions are obtained by operating said first and second pulse motors individually and by additively and subtractively combining said first and second resolutions by means of said first, second, and third control means.
Claim 2
Dependent Claim
196 words
A numerical feed control device comprising: at least one movable member slidably mounted on a machine tool; first and second pulse motors for moving said movable member, said first pulse motor having a first resolution and siad second pulse motor having a second resolution different from said first resolution, wherein resolution is defined as the distance of movement of said movable member for each pulse applied to one of said motors; engaging means for operatively engaging said pulse motors with said movable member; and, a control circuit connected to said pulse motors for controlling the rotation thereof, said control circuit comprising first control means for synchronously rotating both said pulse motors in one direction, second control means for selectively rotating either one of said pulse motors in one direction and stopping the other thereof, and third control means for rotating one of said pulse motors in said one direction and for synchronously rotating the other thereof in the reverse direction, whereby four separate resolutions are obtained by operating said first and second pulse motors individually and by additively and subtractively combining said first and second resolutions by means of said first, second, and third control means.
Claim 3
Dependent Claim
94 words
A numerical feed control device as set forth in claim 1, wherein said engaging means comprises a feed screw shaft connected with one of said pulse motors which is mounted on said machine tool; a nut member rotatably mounted on said movable member and operatively engaged with said feed screw shaft; a worm mounted on the other pulse motor which is mounted on said movable member; and, a worm wheel concentrically keyed to said nut member and operatively engaged with said wheel, whereby said movable member is moved by means of said pulse motors.
Claim 4
Dependent Claim
94 words
A numerical feed control circuit as set forth in claim 1, wherein said control circuit further comprises a reader for reading input information; a decoder connected to said reader for decoding said input information; a main control circuit connected between said decoder and said first, second, and third control means; and, a pulse generator connected to said main control circuit and to said pulse motors through said first, second, and third control means, whereby said pulse motors are selectively rotated in response to said input information through said first, second, and third control means.
Claim 5
Dependent Claim
28 words
A numerical feed control device as set forth in claim 3, wherein said first, second, and third control means include a plurality of AND gates and OR gates.
Claim 6
Dependent Claim
23 words
A numerical feed control device as set forth in claim 4, wherein said first, second, and third means further include a NOR gate.
Claim 7
Dependent Claim
38 words
A numerical feed control device as set forth in claim 3, wherein said control circuit still further includes a counter for stopping said pulse generator and resetting said main control circuit upon the reaching of a predetermined count.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |