A sheet is wound up on a frictional carrier drum having a circumferential length longer than a sheet length so that the length of the wound-up sheet is a quarter or more of the circumferential length, and contact elements for pressing the sheet against the frictional carrier drum are provided at four or more positions around the frictional carrier drum so as not to generate a slip of the sheet, whereby it is possible to prevent a slip between the sheet and the frictional carrier drum, and it is also possible to prevent the superposition deviation of colors in a transfer process repeated several times.