Image forming apparatus and method of controlling same

Details Image forming apparatus and method of controlling same Image forming apparatus and method of controlling same

1997-07-08

2001-03-20

Zimmerman, Mark (Department: 2671)

Facsimile and static presentation processing

Static presentation processing

Detail of medium positioning

C355S117000

Reexamination Certificate

active

06204927

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an image forming apparatus and a method of controlling the image forming apparatus.
2. Description of the Related Art
Heretofore, there is known an apparatus wherein an electrostatic latent image is formed on a photosensitive drum in accordance with input image information data and developed by depositing toner on it, a developed toner image is transferred onto an intermediate transfer body, and the toner image transferred onto the intermediate transfer body is secondary-transferred onto a recording medium.
Meanwhile, Models CLC 700/800 manufactured by Canon Inc. are known as apparatus wherein images in yellow (Y), magenta (M), cyan (C) and black (Bk) are formed frame-sequentially on a sheet of recording paper without using an intermediate transfer body (i.e., without secondary transfer). In these apparatus, a full-color hard copy can be produced by superposing toner images in yellow (Y), magenta (M), cyan (C) and black (Bk) one above another. Further, in a full-color image forming apparatus such as Canon CLC 700/800, it is also possible to form a monochrome image (in black, for example) and form images on both sides of a paper sheet.
However, conventional both-side recording in such an apparatus still has a room for further improvement because the both-side recording is always performed in the same sequence or timed relation and accompanies with a problem from the standpoint of efficiency in image forming.
Further, the image forming apparatus without using an intermediate transfer body has a problem that an apparatus size is increased. If a both-side image forming function is added to that apparatus, a reversing unit for reversing a recording medium upside down would require to be added, resulting in a problem of further increasing the apparatus size.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an image forming apparatus which has succeeded in solving the problems stated above.
The present invention intends to provide an image forming apparatus in which optimum both-side recording can be performed at a high speed by changing an image forming sequence, a method of controlling the image forming apparatus, and a storage medium storing the control method. Additionally, the present invention intends to provide a controller which can inform the host side (external device) of a time required for forming desired images in accordance with the image forming sequence when it is determined.
Another object of the present invention is to provide an image forming apparatus which can realize a both-side image forming function without increasing an apparatus size so much.
According to one embodiment of the present invention, there is provided an image forming apparatus for forming a plurality of images successively on recording mediums, the apparatus comprising intermediate transfer means capable of retaining an image corresponding to the image to be formed, transfer means for transferring the image on the intermediate transfer means onto a recording medium, and reversing means for reversing the recording medium so that an image is to be formed on the rear side of the recording medium having the image transferred onto the front side thereof.
Still another object of the present invention is to provide an image forming apparatus having a novel function, and a method of controlling the image forming apparatus.
The features of the present invention will be apparent from the following description of an embodiment and the accompanying drawings.


REFERENCES:
patent: 5095342 (1992-03-01), Farrell et al.
patent: 5276875 (1994-01-01), Satoh
patent: 5504568 (1996-04-01), Saraswat et al.

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