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LASER HOLES IN VACUUM BELTS Disclosure Number: IPCOM000023124D
Original Publication Date: 1976-Oct-31
Included in the Prior Art Database: 2004-Mar-27

Publishing Venue

Xerox Disclosure Journal


Appropriately sized, spaced, and shaped vacuum holes can be laser perforated in copy sheet or document transport vacuum belts, Vacuum apertures can be provided of minimum background visibility yet providing a sufficient air flow per unit area of the belt to retain sheets thereagainst by a vacuum applied to the opposite side of the belt, Mylar or other suitable material formed into an endless imperforate belt can be rotated on a cylindrical mandrel under a pulsed high power laser beam source, The mandrel may be screw fed axially under the beam to punch a spiral pattern of small holes over the entire belt spaced according to the mandrel surface velocity and the pulse rate of the laser, For example, holes can be produced with a center-~to~centerdistance of approximately .028 inches and a maximum hole size of approximately .01 inches in width, The holes or passageways can be formed as an oval, non~cylindrical, shape with an opening larger at one belt surface than the other, which can be desirable to reduce internal contaminant clogging, A belt formed in layers of different materials with different laser burn rates can be used to form different shaped passage-~ ways in the belt or different surface openings,