Device for clamping a workpiece
US5330168A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 26, 1993 |
| Grant date | Jul 19, 1994 |
| Priority date | — |
| Expiry date | Jan 26, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B5/16
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A clamping device which holds a workpiece at a predetermined position during a machining operation of the workpiece comprises a clamper for clamping a workpiece, a feed device for moving the clamper in the axial direction, a load sensor which is fixed to the clamper and detects a clamping force acting on the workpiece, and a memory in which a target clamping force corresponding to the shape of the workpiece and a method of machining operation is stored. The control device compares the clamping force detected by the load sensor with the target clamping force stored in the memory and controls the clamper in response to the deviation between the detected clamping force and the target clamping force. The clamping device also has a position detecting means for detecting the axial position of the clamper. The control device compares the present position detected by the position detecting means with a stop position which is detected during the initial clamping and is stored in the memory, and controls the clamper in proportion to the deviation between the detected position and the stored stop position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.