US Patent: 2,741,732
|
| Motor Control System for Automatic Machine Tools
|
|
Patentee:
|
|
| Frederick W. Cunningham (exact or similar names) - Stamford, Fairfield County, CT |
| USPTO Classifications: |
|
234/69, 29/702, 318/575, 318/593, 318/630, 318/657, 318/663, 409/240, 409/80, 74/7R, 74/822, 82/118, 82/134
|
| Manufacturer: |
| Not known to have been produced |
|
|
Patent Dates:
|
| Applied: |
Aug. 02, 1951 |
| Granted: |
Apr. 10, 1956 |
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward
Joel Havens
|
|
Description: |
| Claim:
When controlling an engine lathe for example, the holes in the tape correspond to the longitudinal, transverse and angular positions to which the tool is to be driven, and govern the speed with which the tool is driven to that desired position.
In the preferred embodiment the tape perforations allow predetermined contact fingers to cooperate with contact drums thereby connecting certain transformer windings in series to produce voltages proportional in magnitude to the desired displacement of the tool from the defined zero position. This position signal is matched against the output of a potentiometer whose movable element is driven by the tool drive motor, and the error or difference voltage is applied to polarized relay windings which actuate one or another set of switches depending on the direction in which the tool is to be driven. The motor is energized by a constant voltage supply, the magnitude of which is controlled by a perforation in the tape, driving the tool towards the desired position at a constant rate. When the tool is very nearly in the correct position the motor control is transferred to the error signal, so that the motor continues to drive the tool, and the potentiometer movable element, until the error voltage is exactly zero and the tool is correctly positioned. |
|
