Method and apparatus for operating clutch and brake control device of machines having intermittent, undirectional operation
US4506771A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1982 |
| Grant date | Mar 26, 1985 |
| Priority date | — |
| Expiry date | Jul 26, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/1524
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for operating a switching device such as a clutch or brake for a moveable element such as a shaft which is driveable by a prime mover such as a rack and pinion device. The clutch selectively connects the shaft to the prime mover and the brake alternately and selectively connects the shaft to the housing. A motor sinusoidally reciprocates the rack by way of an eccentric drive and the rack drives a pinion on the input side of a pneumatic clutch and brake unit. The clutch is always operated in only one direction of movement and the moveable shaft can thereby be intermittently driven in one direction. A continuously rotating motor shaft carries a signal generator disc having a signal generating track in the form of recesses which are scanned photoelectrically. An operating signal which holds the clutch engaged during one half period is received by the signal generator and delivered by a control device. Switching devices such as clutches and brakes possess a certain reaction time between the occurrence of the operating signal and the instant when the clutch or brake becomes effective. The reaction time creates a problem relative to the desired requirement that the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.