Photo-cell Safety

Press, Volume CVI, Issue 31167, 17 September 1966, Page 12

Photo-cell Safety

A NEW kind of photoelectrie safety guard for power presses, guillotines and other equipment used in metal-working, printing and so forth is being introduced by Lightguards of Dunstable, reported Denis Desoutter in the 8.8. C. “Science and Industry” programme. These guards use beams of light projected across the front of the machine on to photocells on the opposite side. As with other photoelectric safety devices, an interruption of the beam, or even a failure of the photocell circuit, switches off the machine.

These new guards, which have been developed to meet the more stringent regulations soon to be introduced by the British Government, have anything from two to six beams of light set out horizontally in front of the machine—and slightly below the level of the working bed of

the machine. They are fitted to awns which extend forward, rather like the arms of an arm-chair, and the operator cannot enter between these arms without stopping the machine.

This arrangement differs from the usual one, where the beams of light form a vertical screen, like iron bars across a gaol window, and they have the advantage that there is complete freedom for the operator to feed in sheets of any thickness without interfering with the light beams. The makers claim tint as well as being safer than other guard systems, this new arrangement allows increased productivity by malting working conditions easier. They provide special plugin modules with which any faulty part in the circuit can be replaced, so that if the system goes wrong a machine need be out of action for only j a minute or two.”

Across I—Appointment about to be, put back causes a discus- . sion.(fi) 4—Went by and didn’t make a call. (6) 9 Get rare manner changed for a new disposition. (13) 10— A sect can show social distinction. (5) 11— The shape of cruel Ups extended? (7) 12— Disreputable dealers you’U find out in a back street (5) 13— Insignificant men on the board. (5) 18—Showing signs of overwork—in need of rewinding! (3, 4) 20— Put something into circulation for children. (5) 21— Theatrical shows that those who retire after long service get. (13) 22 Rogue making his contriI- bution to the senora's calamity. (6) >23—What the private and the 1 priest take. (6)

Down 1— To be a member of the management is straightforward. (6) 2 Metal workers could they be employed at the Mint? (5-8) 3 A lot of water to hire about the end of September. (7) s—Concerning superficial measurement for antenna, we hear. (5) •—A bit of a footpath between the banks. (8-5) 7 The obligations of the French restrictions. (8) 8— Rose may here—growing up or lying down! (2, P* lot « • traveller. (7) 15—Correct sort of ties for estates! (6) 18—What the worried needlewoman does with her brows! (5) 17—The man who takes this is out for the count. (6) 13—Words and musie are returned after a little work. (5) I [Solution Page 13] ' »’