Laser apparatus for repetitively marking a moving sheet

Details Laser apparatus for repetitively marking a moving sheet Laser apparatus for repetitively marking a moving sheet

B - Operations, Transporting

23

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95/32, 327/1.4

B23K 26/18 (2006.01) B23K 26/06 (2006.01) B23K 26/067 (2006.01) B23K 26/08 (2006.01) B41J 2/44 (2006.01) B41M 5/24 (2006.01)

Patent

CA 1310072

34 ABSTRACT OF THE DISCLOSURE A laser beam is used to mark a longitudinally moving web of paper both at intervals along its length and at plural locations across its width so that each of the sheets finally cut from the web bears a mark. The web passes over a cylinder having windows bearing masks carrying a logo or the like to be marked on the web. Mirrors are arranged on a drum assembly coaxially located in the cylinder to rotate therewith. The mirrors are disposed in helical sets extending along the axis of the drum to successively intercept a laser beam directed parallel to the axis of the drum and to reflect the beam to successive mask windows. The mirrors are plane mirrors set at 45° to the axis and cause the beam to scan the mask in the circumferential direction. The beam is collimated but not focussed and has a diameter that encompasses the transverse width of the mask. A ring mode laser beam is preferred.

591264

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