US3568029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant velocity drive control for machine tools and the like
Assignee: AO Smith Corp
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Filing: 1969-01-24
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Granted: 1971-03-02
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Expires: 1989-01-24
Abstract
Abstract This disclosure includes a pair of drive motors energized to move a weld head along two related perpendicular axes in a horizontal plane. The one motor is a variable speed motor. A closed servoloop includes a reference input to establish a constant velocity drive along the related axis for the variable speed motor. A separate cam and follower positions a potentiometer to generate a signal proportional to the velocity correction at each point on the path for lateral movement with respect to the one axis. The signal is combined with the reference input in the servo to establish a modified drive signal. This maintains the resultant horizontal velocity vector constant.
Inventors
- 👤 John G Bollinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:06
CPC Classifications
B; B23; B23Q; B23Q35/00; B23Q35/04; B23Q35/08; B23Q35/12; B23Q35/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
199 words
In a tracer control for moving a member in two perpendicular directions in a given plane to define a preselected path, comprising a sensing means connected to directly sense the desired position of said member in only a first of said perpendicular directions and establishing a variable control signal, a first variable drive means connected to move the member in said first direction in direct proportion to said variable signal, a second variable drive means for moving said member in a second of said perpendicular directions, a reference input means connected to said second variable drive means for establishing movement in the second direction at a selected reference velocity corresponding to a desired velocity in said plane, a correction means establishing a correction signal solely proportional to the velocity correction in the second direction associated with the movement in said first direction necessary to maintain the resultant movement of the member constant in the given plane and connected with the reference input signal to said second variable drive means to conjointly actuate said second variable drive means and vary the velocity in the second direction from said reference velocity to maintain the desired constant velocity in sAid given plane.
Claim 2
Dependent Claim
199 words
In a tracer control for moving a member in two perpendicular directions in a given plane to define a preselected path, comprising a sensing means connected to directly sense the desired position of said member in only a first of said perpendicular directions and establishing a variable control signal, a first variable drive means connected to move the member in said first direction in direct proportion to said variable signal, a second variable drive means for moving said member in a second of said perpendicular directions, a reference input means connected to said second variable drive means for establishing movement in the second direction at a selected reference velocity corresponding to a desired velocity in said plane, a correction means establishing a correction signal solely proportional to the velocity correction in the second direction associated with the movement in said first direction necessary to maintain the resultant movement of the member constant in the given plane and connected with the reference input signal to said second variable drive means to conjointly actuate said second variable drive means and vary the velocity in the second direction from said reference velocity to maintain the desired constant velocity in sAid given plane.
Claim 3
Dependent Claim
49 words
The tracer control of claim 1 having feedback means to sense the actual velocity, said second variable drive means having a second input means connected to said feedback means to actuate the second variable drive means to maintain and stabilize the selected constant resultant velocity in the given plane.
Claim 4
Dependent Claim
31 words
The tracer control of claim 1 wherein said second variable drive means includes a servo summing amplifier, said reference input means and said correction means being connected to the summing amplifier.
Claim 5
Dependent Claim
46 words
The tracer control of claim 1 wherein said correction means includes a control cam and follower positioned relative to each other in accordance with the relative position of the member along said path and a signal generator coupled to said follower to produce said correction signal.
Claim 6
Dependent Claim
125 words
The tracer control of claim 1 for moving a weld electrode having means for angular orientation in a vertical plane and a horizontal plane defining said given plane, comprising means to sense the velocity of the electrode in the two perpendicular directions in said given planes for angularly orienting the electrode in said given plane, said variable drive means including a motor coupled to the weld electrode for moving said electrode in the second direction and having a multiple input summing amplifier connected to the reference input means and to the correction means, and said correction means including a cam actuated signal generator having an input responsive to the positioning of the electrode in said first direction and an output proportional to the velocity correction.
Claim 7
Dependent Claim
133 words
The tracer control of claim 1 for moving a welding electrode means with a horizontal plane as said given plane and said path being defined by a X-coordinate and a Z-coordinate axis in said plane, wherein said first sensing means senses to position the member on the Z-coordinate axis, said variable drive means having a motor coupled to said member and having a closed loop servosystem for said motor, a first voltage signal means defining said reference input means and connected as a first input to the servosystem, a cam means and a follower coupled to said electrode means to establish said signal proportional to the velocity correction as a correction voltage and connected as a second input to said servosystem, a signal generator coupled to said motor and connected to said servosystem.
Claim 8
Dependent Claim
63 words
The tracer control of claim 1 wherein said first reference input means establishes a voltage signal having an amplitude proportional to the desired reference velocity, and said correction means establishes a corresponding correction voltage signal, and said second variable drive means having a summing means connected to summate said voltage signals and establish a drive proportional to the difference in said voltage signals.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |