Search International and National Patent Collections
Some content of this application is unavailable at the moment.
If this situation persists, please contact us atFeedback&Contact
1. (WO1980000036) INTRUSION DETECTOR FOR PRESS BRAKE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1980/000036 International Application No.: PCT/US1979/000379
Publication Date: 10.01.1980 International Filing Date: 05.06.1979
IPC:
F16P 3/14 (2006.01) ,G01V 8/20 (2006.01)
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16
ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
P
SAFETY DEVICES IN GENERAL
3
Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
12
with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
14
the means being photocells or other devices sensitive without mechanical contact
G PHYSICS
01
MEASURING; TESTING
V
GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
8
Prospecting or detecting by optical means
10
Detecting, e.g. by using light barriers
20
using multiple transmitters or receivers
Applicants:
Inventors:
Priority Data:
91325306.06.1978US
Title (EN) INTRUSION DETECTOR FOR PRESS BRAKE
(FR) DETECTEUR D"INTRUSION POUR PRESSE PLIEUSE
Abstract:
(EN) An intrusion detection system is disclosed for safeguarding an operator of an industrial machine such as a press brake. A light screen barrier (420) comprises sequentially pulsed beams (422) which are spaced far enough apart to permit penetration by a work piece (144) without obstructing more than one beam whereas penetration by the operator"s hand will obstruct at least two adjacent, successively pulsed beams. A pulse train of regularly spaced signal pulses (BRS) with each pulse corresponding to a light beam is produced when none of the light beams are obstructed. A missing pulse detector (600, 40") with a logic circuit (502) produces a control signal for stopping the machine only when two or more adjacent light beams are obstructed causing two or more successive missing pulses in the pulse train.
(FR) Un systeme de detection d"intrusion protege un operateur travaillant sur une machine industrielle telle qu"une presse plieuse. Une barriere a ecran lumineux (420) comprend des rayons pulses successifs (422) qui sont espaces suffisamment pour permettre l"introduction d"une piece a travailler (144) sans provoquer l"obstruction de plus d"un rayon tandis que la penetration de la main de l"operateur provoquera l"interruption d"au moins deux rayons pulses successifs adjacents. Un train pulse de signaux espaces regulierement (BRS) dont chaque pulsation correspond a un rayon lumineux est produit lorsqu"aucun des rayons lumineux n"est interrompu. Un detecteur d"absence de pulsations (600, 40") avec un circuit logique (502) produit un signal de commande pour arreter la machine seulement lorsque deux ou plusieurs rayons lumineux adjacents sont interrompus, provoquant l"absence de deux ou plusieurs pulsations successives dans le train de pulsations.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)