Slide driving device for presses
US6085520A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1997 |
| Grant date | Jul 11, 2000 |
| Priority date | — |
| Expiry date | Nov 18, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB30B1/188
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A slide driving device employs a variable-displacement pump/motor for driving a rotating element of the slide driving device. The displacement volume of the variable-displacement pump/motor, whose output drives the slide, is varied in response to deviation of measured driver parameters from commanded driver parameters. An energy storage device temporarily absorbs excess energy during a portion of a molding cycle, and returns the energy to the system for re-use. In one embodiment, the energy storage device is an accumulator. In a second embodiment, the energy storage device is a flywheel. The combination of variable displacement volume and energy storage maintains the fluid pressure substantially constant during a cycle of the slide driving device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.