Patent ID: 8503922
Filing Date: 2013-08-06
Classification: B41J,G03G

Abstract:
1. A duplex printing apparatus provided with a circulating transfer route including a sheet reversing path, and configured to transfer a sheet printed on a front side thereof in a circulating manner along the circulating transfer route, reversing front to rear, to make a print on a rear side thereof in an interleaf control method, the duplex printing apparatus comprising: a printer adapted for image formation onto a sheet of a sheet width Lp in a transfer direction, with a sheet spacing Lg and a printing transfer speed Vg; a constant speed transferrer adapted for constant speed transfer of sheet at the printing transfer speed Vg from a register for sheet registration via the printer to a prescribed speed change position in the circulating transfer route; a variable speed transferrer adapted for transfer of sheet from the speed change position via the sheet reversing path to the register, and a transfer controller configured to control transfer speeds of sheet in the variable speed transferrer, the variable speed transferrer comprising sections configured for sheet transfer, including a combination of a deceleration section and an acceleration section adapted for sheet reversal at the sheet reversing path, and a constant speed section adapted for transfer at a transfer speed Vr, the transfer controller being adapted to, in the case of two or more sheets: