METHOD OF UNSTRESSING A SHEET

摘要

The present invention concerns a method of relaxing or unstressing a sheet which is transferred from one bank of grippers in a rotary offset printing machine to the next bank of grippers. The invention reduces or eliminates stress in the front edge region of the sheet after the sheet has been transferred, yet before the next printing operation. This is accomplished by briefly opening or relaxing at least some of the grippers of the bank of grippers that are guiding the sheet. This invention reduces image imperfections caused by creasing, buckling or twisting of the sheet.