Pneumatically operated stop for advanced workpieces
US4828446A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 23, 1988 |
| Grant date | May 9, 1989 |
| Priority date | — |
| Expiry date | Jun 23, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/764
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A pneumatically operated stop for advanced workpiece comprises a pneumatic cylinder with a displaceable piston rod on which a stop is secured. A limit stop coacting with the extended piston rod defines the setpoint position of the stop. A precision limit switch for sensing the setpoint position of the stop generates a command signal when the stop moves away from its setpoint position. This signal controls a valve which is connected with the pneumatic cylinder. This valve connects the pneumatic cylinder in an unpressurized manner with the ambient atmosphere when the stop is occupying the setpoint position and no workpiece is resting against the stop. Once the stop has been displaced from its setpoint position by an advanced workpiece, pressure is applied to the cylinder by this valve in order to return the stop together with the workpiece to the setpoint position, and this pressure is maintained for a preselected amount of time by the valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.