Guard device for machines such as bending presses, cutting...

Details Guard device for machines such as bending presses, cutting... Guard device for machines such as bending presses, cutting...

2005-07-19

2005-07-19

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C072S020200, C072S021300, C100S348000

Reexamination Certificate

active

06919555

ABSTRACT:
A guard device for machines such as bending presses, cutting machines, stamping machines or the like, has a first machine part which performs operative movements toward a second machine part. A laser photoelectric detector arrangement is attached to the first machine part and possesses at least one photoelectric detector, whose light beam shines in an adjustable secure distance from this machine part. On interruption of the light beam the operative motion is arrested. An abutment arrangement on the second machine part prevents interruption of the light beam. The photoelectric detector arrangement is either so laterally offset that an interruption of the light beam by the first machine part is excluded during further movement or the photoelectric detector arrangement is arranged on the first machine part in the working path thereof. A switch, able to be worked on reaching the abutting position, deactivates photoelectric detector.

REFERENCES:
patent: 4166369 (1979-09-01), Nakajima
patent: 4357820 (1982-11-01), Blanchard
patent: 5579884 (1996-12-01), Appleyard et al.
patent: 6316763 (2001-11-01), Appleyard et al.
patent: 6389860 (2002-05-01), Stalzer

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