Sheet medium transport system, particularly for printers and plo

Details Sheet medium transport system, particularly for printers and plo Sheet medium transport system, particularly for printers and plo

1994-07-21

1995-04-11

Eickholt, Eugene H.

Typewriting machines

Sheet or web

Including friction-feed means

101228, 101232, 226 95, 226 7, 346136, 400636, B41J 1302

Patent

active

054052050

ABSTRACT:
The invention disclosed herein provides a method and apparatus for counteracting the effects of a localized drag on a sheet medium as it is being moved by a drive system, for example, in a printer or plotter to prevent misregistration of the sheet medium with the X-axis drive system as the sheet medium is moved past the print or plot head which creates a drag thereon. The sheet medium is stiffened in the region thereof which is contacted by the print or plot head by bending the sheet medium in a direction normal to the direction of movement of the sheet medium. The bend may be provided by a curved guide located between the print or plot head and the X-axis drive system. Friction is reduced between the sheet medium and the curved guide by mounting the curved guide, e.g., one or more rollers, to rotate freely under the action of the sheet medium moving thereover, or by pneumatically supporting the sheet medium above the curved guide as the sheet medium is moved thereover.

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