Maxson Automatic Machinery Company has developed a low roll diameter detection design that aids an operator by automatically slowing a sheeter to stop when a preset roll diameter is reached at the roll stand. This feature allows the operator to monitor other aspects of the sheeting process yet still allows the line to stop before a roll completely expires, thereby protecting the sheeter from damage caused by a flailing tail running through the cutter and the associated downtime or rethreading a sheeter rather than splicing the leading edge of the new roll to the end of the old web.
The automatic tension system uses a proportional control design. A sensor fixed on the roll stand’s brake mounting plate monitors the number of rotations. Using these inputs, the controller calculates the diameter of the roll, lessening brake pressure automatically as the circumference reduces.