US4211512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary table with ballscrew drive
Assignee: Kearney and Trecker Corp
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Filing: 1978-12-20
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Granted: 1980-07-08
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Expires: 1998-12-20
Abstract
Abstract A rotary table is driven by a pair of perpendicularly disposed linear slides which are each driven by a ballscrew drive. One of the linear slides is mounted on the movable member of the other linear slide and is coupled to the rotary table by a crank stud. The linear slides are driven at speeds which vary in accordance with the sine and cosine of the table angle to translate the linear slide motion into rotary motion.
Inventors
- 👤 Frank Zankl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:59
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/33; G05B19/35; G05B19/351; B; B23; B23Q; B23Q1/00; B23Q1/25; B23Q1/44; B23Q1/50; B23Q1/52; B23Q1/522; B23Q1/56; B23Q1/60; B23Q1/62; B23Q1/621; Y; Y10; Y10T; Y10T409/00; Y10T409/30; Y10T409/30868; Y10T409/308792; Y10T74/00; Y10T74/14; Y10T74/1471; Y10T74/1488
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
97 words
A rotary table drive comprising: a frame; a tabel journaled to said frame for rotation about a first axis; a first linear slide slidably mounted on said frame for movement along a second axis perpendicular to said first axis; a second linear slide slidably mounted on said first linear slide for movement along a third axis perpendicular to both said first and second axes; a rotary crank coupling said second linear slide to said table; and means for simultaneously moving said first and second linear slides at variable linear speeds to cause rotary movement of said table.
Claim 2
Dependent Claim
97 words
A rotary table drive comprising: a frame; a tabel journaled to said frame for rotation about a first axis; a first linear slide slidably mounted on said frame for movement along a second axis perpendicular to said first axis; a second linear slide slidably mounted on said first linear slide for movement along a third axis perpendicular to both said first and second axes; a rotary crank coupling said second linear slide to said table; and means for simultaneously moving said first and second linear slides at variable linear speeds to cause rotary movement of said table.
Claim 3
Dependent Claim
75 words
A rotary table drive according to claim 1 wherein the last mentioned means includes a first ballscrew mechanism coupled to said first slide for moving the slide; a first servo motor coupled to said first ballscrew mechanism; a second ballscrew mechanism coupled to said second slide for moving the slide; a second servo motor coupled to said second ballscrew mechanism; and servo drive means for controlling the operation of said first and second servo motors.
Claim 4
Dependent Claim
102 words
A rotary table drive according to claim 2 wherein said servo drive means includes means for generating a drive velocity for said first servo motor and a drive velocity for said second servo motor which vary in accordance with the sine and cosine of the table angle θ in accordance with the following equations to generate respective distances X and Y that will generate the desired table angle θ with the cranking radius R: X=R(1-Cos θ); Y=R Sin θ for 0°≦θ≦90° X=R[1+Sin (θ-90°)]; Y=R Cos (θ-90°) for 90°≦θ≦180° X=R[1+Cos (θ-180°)]; Y=-R Sin (θ-180°) for 180°≦θ≦270° X=R[1-Sin (θ-270°)]; Y=-R Cos (θ-270°) for 270°≦θ≦360°.
Claim 5
Dependent Claim
35 words
A rotary table drive according to claim 1 wherein said rotary crank comprises a crank bearing in said rotary table and a crank stud projecting from said second linear slide and engaging said crank bearing.
Claim 6
Dependent Claim
28 words
A rotary table drive according to claim 4 wherein said crank bearing and crank stud are displaced from said first axis and rotate in a cranking circle therearound.
Claim 7
Dependent Claim
19 words
A rotary table drive according to claim 1 wherein both ballscrew mechanisms have anti-backlash nuts to prevent lost motion.
References Cited (Backward Citations)
US3587390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-08 | 1984-01-07 | 1984-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-08 | 1988-01-07 | 1988-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-08 | 1992-01-07 | 1992-07-08 | $7700.00 | Window Closed / Lapsed |