Active charging in the feeder of a gathering machine

How does the gathering machine work?

Gathering machines consist of 15 - 25 individual stations (feeders). The individual products, which in the end make up a bound booklet, are conveyed via the feeders onto a carrier chain. Individual products can consist of 1 - 10 sheets. A cross accelerator then gives the product the required chain speed.

Can the printed products slip?

Due to the transverse acceleration, especially with gravure products, the inner pages slip more and more and move out of the bond. The jogger does not manage to change this state before perfect binding. The customer runs into waste and has machine downtime.

Our solution

A targeted electrostatic charging of each individual print product can prevent slippage.

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Which Eltex components are used?


The POWER CHARGER units cover various performance stages and charging applications. They can be operated either with a supply voltage of 24 V DC or a line voltage in the range of 85 V – 264 V AC. The output voltage is 75 or 150 watts. A membrane keyboard or an optionally available, integrated touch panel is used to control the generators. POWER CHARGER units can be operated using analog operation or via digital fieldbus interfaces. At the market launch, a control system that uses CANopen and ModbusTCP are available. The modular system is only prepared for integrating other fieldbus standards.   Protocol/device description files of the fieldbus interfaces for integration into the machine control: Information on fieldbus integration

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Heavy-duty precision bar for supply voltages up to 60 kV. The charge and field distribution have been substantially improved by the optimized arrangement of the individual bars. Separate current-limited tips prevent an increase in air ionization and high-energy brush discharges.

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