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Shown and described is a device which supports sheets against the platen in the area between feed rollers and paper bail in a printer.
English (United States)
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Shown and described is a device which supports sheets against the platen in
the area between feed rollers and paper bail in a printer.
During print operation, sheet 1 is driven about platen 2 by feed rollers 3. Bail
roller 4 pulls the sheet against platen 2. Print area 5 is located between feed
rollers 3 and bail 4. Occasionally, problems of paper buckling in this area occur.
To eliminate this situation sheet support structure 6 was conceived. Support
structure 6 also acts as a deflector in that part of the feed path between drive
rollers 3 and bail 4.
Sheet support structure 6 has a cavity 7 molded therein with an inclined
surface 8 of predetermined angle. Resting in cavity 7 is freerolling ball 9 which
exerts a hold-down force on the sheet just above print area 5 and thereby
eliminates buckling which could cause a print distortion. Sheets of varying
thickness, as well as carbons or multipart paper, can be used with this device.
Ball 9 rolls up inclined surface 8 as the sheet thickness increases, yet gravity
causes the holddown force to continue.
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