Process for controlling the force on a moving web of material
AssigneeErhardt & Leimer GmbH
InventorsDieter Peltzer, Heinz Hermanns, Hans Seibold
Life of this patent
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Abstract
An process for controlling the force exerted on a moving web of material, including a batten roller having an adjustable drive and a fixing roller having a pressure sensor. An amplifier is coupled between the pressure sensor and the adjustable drive. A web pulling device pulls the web in a downstream direction across the batten roller and the fixing roller. The pressure sensor generates a first signal representing the tensile force on the web as it passes the fixing roller. The first signal is amplified to provide a control signal to the drive for adjusting the speed of the batten roll.
Claims2
A process for controlling the force exerted on a moving web of material, comprising the steps of:
- selecting a predetermined tension valve;
- pulling the web across a guiding and breadth-stretching roller and a fixing roller to guide and spread the web;
- generating a first signal representative of the force exerted on the web as it passes the fixing roller;
- generating a second signal representative of the rotational speed of a driven wheel located downstream of the fixing roller;
- generating a control signal by
- (i) comparing the first signal to the predetermined tension value, and
- (ii) compensating for the running speed of the web based on the second signal;
- amplifying the control signal;
- and
- controlling the speed of the guiding and breadth-stretching roller dependent upon the amplified control signal so that a constant predetermined force is exerted on the moving web whereby difficult and sensitive fabrics are spread without creating undesirable distortions in the fabric.
Dependencies are inferred from the claim text.