Press machine
US9138794B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 2011 |
| Grant date | Sep 22, 2015 |
| Priority date | — |
| Expiry date | May 15, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB30B15/183
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A press machine includes a lifting mechanism that selectively lowers and lifts a die on a movable side. The lifting mechanism includes a motor driven lifting unit using a servomotor as a drive source thereof, and a hydraulically driven lifting unit using a hydraulic actuator as a drive source thereof. The lifting mechanism is controlled so as to enable the motor driven lifting unit to move the die on the movable side from a standby position to a drive system changeover position immediately before a press start position at which the die on the movable side starts contacting a workpiece to be processed and so as to enable the hydraulically driven lifting unit to move the die on the movable side from the drive system changeover position to a top dead center position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.