METHOD AND DEVICE FOR SHEET MOTION GUIDING IN SHEET QUALITY CONTROL Russian patent published in 2002 - IPC

FIELD: printing. SUBSTANCE: method of sheet motion guiding in quality control of sheets treated in printing machine or in sheet treatment machine is realized with use of transmitting television device facing the first side or second side of sheet and with the help of holding device transporting the sheet. In this case, front part of sheet subject to control is caught by the first holding device, and then, rear part of sheet is caught by the second holding device. Then sheet is straightened in circular and axial directions by at least one traveling holding device. After sheet straightening, one side of sheet is controlled with switching-on of transmitting television device by the device realizing claimed method. Television device faces the first side or second side of sheet and located at drum transporting the sheet. Drum has the first holding device catching the front part of sheet. Drum has at least one second holding device catching the rear part of sheet and executing motion of straightening the sheet in circular and axial directions before control of the first side of sheet. Invention provides for proper holding of sheets on drum in straightened state during quality control. EFFECT: higher efficiency. 9 cl, 2 dwg