Machine tool with protective light curtain and work stock holding mechanism
US4070940A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1977 |
| Grant date | Jan 31, 1978 |
| Priority date | — |
| Expiry date | Feb 1, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/7567
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A shear machine having a blade for cutting successive increments of material from flat sheet work stock has a cutting zone guarded by a curtain of light. Photosensitive means actuates a brake to stop blade motion if an object extends through the light curtain towards the cutting zone. Hold-down mechanism is operated by a lever or the like situated outside of the guarded region to enable the final portion of a sheet of work stock to be manually held in place at the cutting zone without penetrating the light curtain. The plane of the light curtain inclines towards the front of the shear machine enabling the hold-down mechanism control lever or the like to be situated on the machine above the cutting zone where it may be reached without interception of the light curtain by the operator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.