Roller feed

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Roll feeds are often found on presses with automatic or continuous stroke modes. The roller feed is usually attached to the machine table and is infinitely variable in height, either via a thread system or a hydraulic lifting unit or electrically.

Structure of a roller feed

The roller feed consists of

  • Leadership roles
  • lower role
  • upper role
  • Pneumatics or hydraulic cylinders
  • electrical control

At the infeed (front part of the feed) are the guide rollers, which incline depending on the curvature of the material and thus allow the material to be guided "cleanly". Before the material reaches the feed rollers, a sensor is used to check whether the tape is present. Then the material is drawn in by the feed rollers. The feed rollers consist of the upper and lower roller. The upper roller is adjustable and can therefore be adjusted to any material thickness. Furthermore, the ventilation cylinder is attached to the upper roller. The aeration cylinder not only lifts the roller, it also puts pressure on the roller to properly advance the material.

Automatic process

The tape is inserted into the feed, the machine has been switched to automatic and now takes over the start command for the feed. At time X, the material is drawn in by the feed rollers and transported into the interior of the machine. In certain production processes it is necessary that the feed rollers let go of the material as soon as the material is processed, e.g. B. in punching processes in metal processing. This "letting go" is called intermediate ventilation and is made possible by the lifting cylinder. Depending on the material thickness, the feed is used with hydraulic (for thick material) or pneumatic (thin material usually up to 7 mm) intermediate ventilation. After finishing the material processing, the upper roller is lowered again and pressed on to enable the material to be advanced again.

Electric control

The feed time and the time for the intermediate ventilation is usually implemented via a cam switch mechanism or a rotary encoder on the press shaft. The start command is then programmed in the feed control using the angle information. Start commands from 0 to 360 ° are possible.

literature

  • Eugen Kaczmarek: Practical stamping. Third volume, composite tools, automatic feeding means and flow path systems, Springer Verlag, Berlin 1954.

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