The new ZDDM 050T sheet sensor from Baumer has been designed to ensure high quality of bound print products in collating machines. For this task, a 60 x 80 mm image is taken of every sheet at a specified point in rapid sequence and this image is compared to a previously programmed reference image. The fully integrated image analysis system activates a simple switching output for sheet acceptance or rejection. Based on this information corrective actions can be initiated in the machine. The accept/reject signal is presented on a display together with additional sheet recognition information and can also be transmitted via Ethernet for remote monitoring and report generation.
The sheet sensor combines complex image recognition with the simplicity of a switching sensor
An intelligent teach-in process performed at the beginning of every print run ensures optimal recognition of the sheets. In run mode, up to 10 sheets per second are analysed at a speed of up to 3 m per second. The sheets, which may be printed either matt or gloss, may be between 110 and 500 mm in length and up to 5 mm thick. The sensor tolerates shifts in position of about 10 m along the x and y axes, as well as rotations of up to 3 degrees.
Thanks to its compact housing, 100 x 50 x 60 mm, the sensor can be mounted directly on the feeder. It is synchronised with the machine by means of the sheet start signal (external sensor), encoder pulses (CHA/CHB) or via an image trigger pulses from the control system. As the imaging optics, LED lighting, image analysis system and the interfaces (digital I/O and Ethernet) are integrated in the sensor, no additional equipment is necessary.
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