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Browse Prior Art Database

Multiple Print Station Paper Feed System

IP.com Disclosure Number: IPCOM000117981D
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 75K

Publishing Venue

IBM

Related People

Lee, HC: AUTHOR [+3]

Abstract

For a multiple print station thermal transfer printer, the key hurdles that must be overcome are: to be able to determine the precise location of the paper at all times in order to be able to accurately place dots on paper; to prevent slippage of the paper as it traverses from one print station to the other; to easily load new ribbon (or consumables) at each print station, and to be able to maintain proper, uniform pressure between the print head and the paper ribbon sandwich.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Multiple Print Station Paper Feed System

      For a multiple print station thermal transfer printer, the key
hurdles that must be overcome are: to be able to determine the
precise location of the paper at all times in order to be able to
accurately place dots on paper; to prevent slippage of the paper as
it traverses from one print station to the other; to easily load new
ribbon (or consumables) at each print station, and to be able to
maintain proper,  uniform pressure between the print head and the
paper ribbon sandwich.

      Paper is driven by a drive motor through a set of drive
rolls.  The motor is driven at constant velocity via a feedback
scheme using an encoder attached to the drive motor shaft.  The paper
is wrapped  around a drum whose outside surface is made of an
appropriate dielectric  material.  The drum is mounted on low
friction bearings and is free to  rotate.  The drum inertia tends to
keep the paper moving at constant velocity as well.  The drum surface
is charged to an appropriate level  with the drum charger, which can
be a corona wire.  The paper from the  supply spool or paper supply
is kept in tension by an electric braking  device applied to the
paper supply support shaft.  The constant tension  is obtained by
adjusting the electric braking device proportional to the  paper
capacity server output.  From the paper supply roll, the paper goes
around a set of idler rolls and to a paper charging station.  The
idler rolls can be crowned if additional paper guidance is required.
At this  point, the paper is charged via a corona or some alternative
means. The  paper is charged to the opposite polarity of the
di-electric surface of  the drum.  This creates a very strong
attractive force between the paper  and the drum, and thus a very
strong friction or driving force.  This insures that the paper will
not slip relative to the drum.  The paper next e...