Patent ID: 6744490
Filing Date: 2004-06-01
Classification: G03B,G03F

Abstract:
Device for processing of a strip-shaped workpiece, comprising:a delivery reel for supplying a strip-shaped workpiece wound thereon; a processing unit located downstream the delivery reel at which a treatment is performed on a portion of said strip-shaped workpiece; a take-up reel located downstream of the processing unit for taking up the strip-shaped workpiece after processing thereof in the processing unit; a transport mechanism for transporting the strip-shaped workpiece from the delivery reel to the processing part; wherein: an upper sensor and a lower sensor which are located one above the other at locations below a direct path between delivery reel and the processing part, said sensors being adapted to determine the presence and absence of the strip-shaped workpiece sagging between the delivery reel and the processing part; a drive device for driving the delivery reel; and a control element which controls processing and transporting of the strip-shaped workpiece with a preset frequency that corresponds to a preset number of transport and treatment cycles performed by said transport mechanism and processing unit, and which, upon occurrence of a state in which the upper sensor has determined the absence of the workpiece and the lower sensor has determined the presence of the workpiece, detects a fault and interrupts processing and transport if said state remains throughout a delay interval spanning a multiple of said preset frequency.