POSTPRESS: Taming the top sheets
If the uppermost sheets in a stack to be cut are domed and not level, they will shift when the material is placed against the backgauge. The top sheets move upwards against the backgauge, leading to differences in cuts. The operator often tries to bend or roll up the corners of the uppermost sheets, but if it is not done in the right way, the upper sheets will be damaged and no longer useable.
A hold-down clamp at the backgauge ensures that the upper sheets are retained on the loaded material, all of which can then be positioned against the backgauge. Even with the hold-down clamp activated, the material can be pushed against the backgauge and correctly aligned. To guide the uppermost sheets, the hold-down clamp is furnished with additional rollers.