Gill Box machines

  1. Design of closed loop position and speed controllers in PLC programming of Gill Box machines of spinning industry to increase the efficiency and quality of roving produced.
  2. Increasing the accuracy and quality of the roving produced by removing the mechanical Auto-Leveller and adding servo drive and adjusting to control the position and speed and creating the structure of electronic Auto-Leveller in Gill Box machines of spinning industry.
Gill box machine

The roving produced by the carding machine stored in the ” Quarry bank ” are then fed to the “passage” or “gill box” machines.

Gill box machine, is a machine in which 3 to 8 roving are fed and mixed together. Due to the tension applied to the handle of the fed roving, the fibers are parallel and mixed with each other, at the end a roving comes out of the machine. The traction system of this machine uses a set of needles mounted on a chain. Moving the needles along the length of the roving causes the fibers to comb.

In general, the most important tasks of the Gill box machine are mixing roving, stretching and parallelizing the fibers using chain combs, and increasing the uniformity of the output roving.

Usually at the beginning of the first Gill box machine, there is a fiber water lubrication system that prevents the fibers from easily slipping and tearing when combed by the machine’s chain combs. After passing through the traction zone and being exposed to a tension of about 6 units, they turn into roving and are wrapped together like a carding machine inside a Quarry bank.

In the semi-fastoni spinning line, three stages of gill box operation are performed; In fact, the operations described in the first gill box are repeated in the machines of the second and third gill boxes, so that while the fibers are smoothed better, the final roving is completely uniform and a very suitable mixture of fibers of different fed roving is obtained.


To control the uniformity of the thickness of the output roving in the second and third Gill box machines, the Auto-Leveller system is used. Production speed in Gill box machines is between 300 and 400 meters per minute.

The linear density of the roving is smaller (thinner) from the first to the third gill box, which will lead to more parallel fibers in the end gills.

The number of roving fed to the first Gill box machine is 6 to 8 roving, the second Gill box is 6 roving and for the third Gill box, 3 to 4 roving. The output roving linear density of the third Gill box is about half the output roving of the previous two Gill boxes and is about 10 to 12 gram per meter.

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