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Browse Prior Art Database

LASER HOLES IN VACUUM BELTS

IP.com Disclosure Number: IPCOM000023124D
Original Publication Date: 1976-Oct-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 210K

Publishing Venue

Xerox Disclosure Journal

Abstract

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,

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XEROX DISCLOSURE JOURNAL

LASER HOLES IN VACUUM BELTS Proposed Classification
Raymond Mileski U.S. Cl, 271/eR
mt. Ci, B65h 7/00

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,

Volume 1 Numbers 9/10 September/October 1976 33

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34 XEROX DISCLOSURE JOURNAL

Volume 1 Numbe...