Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorTakeshi Tsuchida
Life of this patent
Estimating the term…
Abstract
An image forming apparatus in that a sheet having an image formed on a first side thereof by an image forming portion is again transported to the image forming portion so that an image may be formed on an opposite or second side of the sheet, the image forming apparatus including a sheet feeding portion, a re-transport path, a pair of registration rollers provided upstream of the image forming portion, and a loop forming space provided upstream of the pair of registration rollers so as to form the loop, wherein an entrance to the loop forming space for the sheet having passed along the re-transport path is formed downstream of an entrance to the loop forming space for the sheet fed from the sheet feeding portion.
Claims8
An image forming apparatus in which a sheet having an image formed on a first side thereof by an image forming portion is again transported to said image forming portion so that an image may be formed on a second side of the sheet, said image forming apparatus comprising:
- a sheet feeding portion for feeding a sheet to said image forming portion;
- a re-transport path along which the sheet having the image formed on the first side thereof and again transported to said image forming portion passes;
- registration means provided upstream of said image forming portion for contacting with the sheet fed from said sheet feeding portion or the sheet having passed along said re-transport path, wherein the registration means forms a loop in the sheet to thereby correct the skew feed of the sheet, and thereafter transports the sheet toward said image forming portion at predetermined timing;
- and
- a loop forming space provided upstream of said registration means so as to form the loop,
- wherein an entrance to said loop forming space for the sheet having passed along said re-transport path is formed downstream of an entrance to said loop forming space for the sheet fed from said sheet feeding portion.
An image forming apparatus in which a sheet having an image formed on a first side thereof by an image forming portion is again transported to said image forming portion so that an image may be formed on a second side of the sheet, said image forming apparatus comprising:
- a sheet feeding portion having feeding rollers and a sheet cassette which are disposed under the image forming portion;
- registration rollers disposed between said sheet feeding portion and the image forming portion, wherein the registration rollers are form a loop in the sheet to thereby correct the skew feed of the sheet, and thereafter transports the sheet toward said image forming portion at predetermined timing;
- an entry route connecting said sheet feeding portion with the registration rollers;
- a re-transport path along which the sheet having the image formed on the first side thereof and again transported to said registration rollers passes, and
- a loop forming space provided upstream of the registration rollers,
- wherein an entrance of the re-transport path to the loop forming space is formed downstream of an entrance of the entry route to said loop forming space.
Dependencies are inferred from the claim text.