Patent ID: 8121510

Claim:
A printer comprising: a printing mechanism comprising: a sheet transfer portion configured with a first drive member for transfer of a sheet as positioned thereto; and an image former configured to form an image on the sheet as positioned to provide a sheet as image-formed; a sheet circulating transfer route including: the sheet transfer portion of the printing mechanism; a transfer section having a second drive member for transfer of the sheet as image-formed configured in a position at a prescribed path distance from the image former of the printing mechanism; and a sheet invert portion configured to invert the sheet as image-formed; a printing condition determiner configured to determine a set of printing conditions including a first condition that a sheet to be positioned in the printing mechanism is equal in length to or longer than the prescribed path distance and a long sheet to be printed on both sides thereof; and a drive controller configured to control the first drive member to establish a first transfer speed of the sheet as positioned and the second drive member to establish a second transfer speed of the sheet as image-formed in accordance with the set of printing conditions determined by the printing condition determiner, the drive controller being adapted, in conformity to the first condition, to set the second transfer speed as identical to the first transfer speed, and in non-conformity to the first condition, to set the second transfer speed as greeter than the first transfer speed.