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The FE 52 color line sensor by Erhardt+Leimer has been on the market successfully for some time, being used for web guiding in the printing and converting industries, mainly in printing presses and slitter rewinders.  Now it adds significant value with an upgrade: the sensor now features a so-called trigger mode, allowing web guiding by an individual criterion within the print image. This individual criterion can be a color line or a contrast, for example an individual letter. For this, an additional print mark sensor and an incremental encoder connected to the FE 52 are required for synchronization. By means of the signals from these auxiliary sensors the FE 52 is always triggered to take a picture at the same position within the repeat. The advantage: if the guiding criterion is within the print image, no technical auxiliary lines are required that are used for web guiding only and are cut off after the printing process. This means that applying the trigger mode leads to significant material savings in the long term, with the result that the investment pays off rapidly in spite of the additional sensors required.

Erhardt + Leimer GmbH