Printing – Rolling contact machines – Rotary
Patent
1994-09-30
1996-05-21
Eickholt, Eugene H.
Printing
Rolling contact machines
Rotary
226 3, 226 44, B41F 1356
Patent
active
055179142
ABSTRACT:
An apparatus for use with a printing press including a tension regulator for maintaining a substantially constant tension level on a web of printing medium passing through the printing press. The printing press has at least one dancer roller, and the tension regulator includes an actuator associated with the dancer roller for maintaining a constant biasing force on the dancer roller. The tension regulator also includes a reservoir which communicates with a first chamber of the actuator to define a second chamber larger than the first chamber. The volume of the second chamber is large enough that changes thereto are negligible to the extent that a piston of the actuator is displaced. Therefore, the pressure within the second chamber remains constant which permits a constant biasing force to be applied to the piston regardless of the displacement of the piston. With a constant biasing force applied to the dancer roller, the web tension is maintained constant regardless of instantaneous changes in feed and take-up rates of the web of printing material.
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