The roll paper input system
Functionality
This system keeps the roll in place and ensures controlled rotation.
It contains the rewinder, which rewinds the paper for paper ejection, and provides an opposite tension
to the paper advance for better paper control.
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The Left Support encloses the Rewinder Motor and Encoder, containing a set of gears that transmit
the Rewinder motion to the spindle. There is a V-shaped spring to load and fix the spindle in
position.
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The Right Support holds the spindle in position to rotate over passive rollers.
In the T520, the right support also contains the dampers for the roll cover opening movement
control (the internal dampers perform a braking action preventing sudden movement during the
opening operation).
NOTE: The right support for the T120 models does not contain dampers. The T120 and T520
have two different assemblies from the factory, nevertheless both can be replaced by the damper
option of T520 (identical from the external point of view), and there is only one service part
available.
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The spindle is designed to hold the paper rolls, and receive the motion from the rewinder gear in
the Left Support. It consists of a central bar and two hubs; the right hub is fixed to determine the
right-side loading position of the paper, and the moveable left hub adjusts to the width of the
paper.
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The Roll Cover (T520 only) shields the roll from dust.
NOTE: The Roll Cover is a passive part, with no sensor: the printer does not know its status.
12 Chapter 1 Printer fundamentals ENWW
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