Recorders – Electric recording – Electrochemical
Patent
1992-06-11
1994-01-25
Moses, R. L.
Recorders
Electric recording
Electrochemical
355327, G01D 1506, G03G 1501
Patent
active
052819817
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an image forming apparatus having a plurality of image forming sections and, more particularly, to an apparatus and method for forming a color image.
2. Related Background Art
A color copying apparatus is constructed so as to form an image by overlapping three colors of cyan, magenta and yellow or four colors including black. In recent years, an apparatus for forming an image of a better reproducibility by digital image processes has been proposed. By using the digital image processes, not only is the image improved but also various functions such as color conversion, trimming, and the like can be realized.
SUMMARY OF THE INVENTION
As mentioned above, color copying apparatus generally can execute various image processes, such as a divisional block copy function. According to this function, an image is generated to an independent recording medium for each output color like a block copy which is used for printing. According to the divisional block copy function, since an image is formed to an individual recording medium for each color, there is a problem that it takes a long output time as compared with the case of the ordinary output where images are overlappingly printed onto the same medium.
Particularly, in an image forming apparatus in which a plurality of image forming sections are arranged in parallel and a recording medium is conveyed among the forming sections, there are still many points to be improved even when such a divisional block copy function is provided.
It is an object of the invention to provide the divisional block copy function even to an image forming apparatus in which a plurality of image forming sections are arranged in parallel and a recording medium is conveyed among the image forming sections.
The other objects and features of the present invention will be apparent from the following description of the embodiment.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram of a color copying apparatus which embodies the present invention;
FIG. 2 is a schematic diagram of an image processing section of the color copying apparatus which embodies the invention; and
FIGS. 3(a) and 3(b) are diagrams showing the image forming operation.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows a cross section of a digital color copying apparatus which embodies the present invention. In the diagram, reference numeral 100 denotes an operating section which is provided to set a paper size to form an image and a divisional block copy mode. Reference numeral 101 denotes a reader section to read an original; 102 a printer section to perform a copy output on the basis of the read image signal; 301 a polygon scanner to scan a laser beam onto a photo sensitive drum; and 302 an image forming section of magenta (M) at the first stage. Image forming sections each having a construction similar to the above construction are designated by reference numerals 303, 304 and 305 with respect to respective colors of cyan (C), yellow (Y) and black (K).
In the image forming section 302, reference numeral 318 denotes a photo sensitive drum to form a latent image by the exposure of a laser beam and 313 a developing device to develop a toner image onto the drum 318. Reference numeral 314 in the developing device 313 denotes a sleeve for applying a developing bias and performing a toner development; 315 indicates a primary charging device for charging the photo sensitive drum 318 to a desired potential; 317 denotes a cleaner to clean the surface of the drum 318 after completion of the copy transfer, 316 denotes an auxiliary charging device for discharging the surface of the drum 318 which has been cleaned by the cleaner 317, thereby obtaining a good charging state by the primary charging device 315; 330 denotes a pre-exposing lamp to erase the residual charges on the drum 318; and 319 denotes a copy transfer charging device for discharging from the back surface of a copy transfer belt 306 and for copy transferring the
REFERENCES:
patent: 4578688 (1986-03-01), Okuno
patent: 4761046 (1988-08-01), Funato
patent: 4887101 (1989-12-01), Hirose et al.
patent: 4893179 (1990-01-01), Ito
patent: 4916547 (1990-04-01), Katsumata et al.
patent: 5081528 (1992-01-01), Hiyashi et al.
Canon Kabushiki Kaisha
Moses R. L.
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