Device for processing of a strip-shaped workpiece

To enable continuation of the transport of a strip-shaped workpiece, its delivery from a delivery reel (1) and its take-up onto a take-up reel (2) even for strip-shaped workpieces that have through openings, such as device holes or the like, in portions thereof, an upper sensor (21,23) and a lower sensor (22,24) are provided for detecting sagging of the workpiece at two points, one above the other, and a control element controls the drive of the delivery reel (1) based on the outputs of the upper sensor (21) and the lower sensor (22) which are located between the delivery reel (1) and processing part. Additionally, the control element controls the drive of the take-up reel (2) based on the outputs of a second upper sensor (23) and a second lower sensor (24) located between the processing part and the take-up reel (2). The strip-shaped workpiece is subjected to processing and transport with a preset frequency, and upon occurrence of a state in which the upper sensor has determined the absence of sagging of the workpiece on the delivery side of the processing part and the lower sensor of this side has determined the presence of the workpiece, a fault is recognized, and processing and transport are interrupted if the state by the above described state does not change during an interval that is a multiple of the preset frequency.