US 5,481,354 A · Image forming apparatus

Abstract

In an image forming apparatus having two-face copy mode, an image reader can read a document image placed on a platen along a subscan scan direction and along a direction reverse to the subscan direction. The image reader includes an image sensor for reading a document image along a main scan direction and along a direction reverse to the main scan direction. In the normal image mode and in the reverse image mode, a normal image and a reverse image of a document are formed by controlling the reading direction and the subscan direction. When a stapler is used to staple a plurality of copy papers, but at positions in the papers which are not appropriate to turn over them if normal images are formed on the papers, the reverse image mode is set for forming a normal image of the document. Further, when a back face is printed in two-face copy mode, it is decided if the back face is placed on the platen so that the image in the back face is reproduced as a reversed image to the image in the front page according to document direction (portrait document or a landscape document), a position of margin, and a direction of the document with respect to document feed direction. The scan mode is changed when it is decided that the document is placed on the platen so that the image in the back face is reproduced as a reversed image to the image in the front page.

Claims10

Dependent claims

An image forming apparatus comprising:

an image sensor for detecting an image of a line in a document along a first direction or along a second direction reverse to the first direction;
a scan system which can shift a line detected by said image sensor along a third direction perpendicular to the first direction when said image sensor detects the line of the document along the first direction or along a fourth direction reverse to the third direction;
an image forming means for forming an image on a sheet of paper according to the image detected by said image sensor;
a stapler for stapling a plurality of papers received from said image forming means, which stapler stacking the papers so as to have an appropriate staple position when images of documents are detected by said image sensor along the first direction;
a staple mode selection means for selecting staple mode using said stapler or non-staple mode not using said stapler;
and
a control means for making said image sensor read a document image along the first line and for making said scan system move along the third direction when said staple mode selection means selects the staple mode.

4 more elements

An image forming apparatus comprising:

an image sensor for detecting an image of a line in a document along a first direction or along a second direction reverse to the first direction;
a scan system which can shift a line detected by said image sensor along a third direction perpendicular to the first direction when said image sensor detects the line of the document along the first direction or along a fourth direction reverse to the third direction;
an image forming means for forming an image on a sheet of paper according to the image detected by, said image sensor;
a stapler for stapling a plurality of papers received from said image forming means, which stapler stacking the papers so as to have an appropriate staple position when images of documents are detected by said image sensor along the first direction;
a staple mode selection means for selecting staple mode using said stapler or non-staple mode not using said stapler;
a document feeder for feeding a document onto the platen;
a document status decision means for deciding if the staple position of said stapler is appropriate in a reproduced image of a document or not;
a scan control means for making said image sensor read a document image along the first line and for making said scan system move along the third direction when the staple mode is set by said staple mode selection means;
and
a mode change means for reversing the detection direction by said image sensor and the shift direction by said scan system when said document status decision means decides that the staple position of said stapler is not appropriate for an image of a document to be reproduced.

7 more elements

Dependencies are inferred from the claim text.

Image forming apparatus

Life of this patent

Image forming apparatus

Life of this patent

Abstract

Claims10