Press with control circuit arrangement
US5115735A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1990 |
| Grant date | May 26, 1992 |
| Priority date | — |
| Expiry date | Jun 27, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B19/416
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A press (2) having a three phase, brushless, direct current drive motor (26) driving a press ram (22) by a way of an eccentric shaft (78) is provided with a control circuit arrangement (89) comprising an incremental encoder (30) for measuring the angular position of the drive shaft (78), and Hall effect sensors (94) for continuously measuring the speed of the drive motor (26). The control circuit arrangement (89) also comprises a computer (108) having registered therein a desired motor speed program (112), and a motor control circuit (104) for comparing the outputs of the encoder (30) and the sensors (94) with the program (112) and feeding the result of the comparison to a motor drive pulse generator (96) to control the speed of the motor (26) in accordance with the program (112) and to stop motor (26) upon the press ram (22) reaching a position at least proximate to its home position (0.degree.) at the end of a cycle thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.