JPS628173A - Image forming device - Google Patents

Abstract

PURPOSE:To sort copies by the number of sheets easily at low cost by performing image formation of a color different from an original image formation color every time a number of originals are copied. CONSTITUTION:When a print key 33 is depressed, a CPU21 judges that originals mounted on a document feeder are copied, group by group, and sends out a command signal to a print control circuit 26 and a printer part 27 to set the 2nd developing device (red) 4 through a conversion cam 9, thereby copying the entire surface of the 1st sheet for sorting in red (what is called solid red). The 2nd developing device 4 is replaced with the 1st developing device (black) 3 through an eccentric cam 8 to copy the originals on the document feeder in regular black. The 1st developing device (black) 3 is replaced with the 2nd developing device (red) 4 to take one copy for sorting in solid red. The 2nd developing device 4 is replaced with the 1st developing device (black) 3 and the originals on the document feeder are copied in black. This operation is repeated until a set number of originals are all copied.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to sorting of images formed in a plurality of copies in an image forming apparatus, particularly an image forming apparatus capable of forming images in multiple colors.

[Conventional technology]

In a conventional image forming apparatus, such as a copying machine, in the case of so-called group copying, in which multiple copies of a document consisting of multiple sheets are made, the paper output side (exit) of the copying machine is equipped with a document feeder for originals. A sorter (device for sorting) was installed to sort each part of the copy.

However, in such a case, a relatively expensive sorter or the like is required in addition to the copying device.

Generally speaking, for users who make only a small number of copies, the disadvantage is that the cost of the sorter is relatively high, making it uneconomical.

〔the purpose〕

The present invention has been made in view of the problems of the prior art as described above, and allows document images to be processed between each part of formed images of multiple copies of a multiple-sheet original without being equipped with a conventional expensive sorter or the like. The purpose is to facilitate sorting of each part at low cost by forming an image in a color different from the forming color.

〔Example〕

The present invention will be explained below based on examples. FIG. 1 is an explanatory diagram of a schematic configuration of an embodiment of an electrophotographic copying machine according to the present invention. Reference numeral 1 denotes a photoreceptor drum as an image carrier that rotates at a predetermined speed in the direction of arrow X with 0 as the center, and 2 a charging member located at the most upstream side of the rotation path for uniformly positively charging the surface of the photoreceptor. 5 is an exposure duct for isolating the original image light flux from the optical system from the surroundings; 6 is a blank exposure device for erasing charges in unnecessary parts outside the image area; 7 is the surface of the photoreceptor drum L; a potential sensor for measuring potential, 3 a first developer (the toner is black, for example);
4 is a second developing device (the toner is, for example, red); 8 and 9 are eccentric cams for converting and operating the first developing device 3 and the second developing device 4, respectively; 10 is an image transfer and transfer device; A charger 11 for paper separation is a cleaner for removing residual toner after transfer.

FIG. 2 is an explanatory diagram of the operation of the first/second developing device 3/4, which is operated by each eccentric cam 8.9 and is switched between a non-developing position shown by a solid line and a developing position shown by a dashed-dotted line. It is structured so that it can be used.

In addition, FIG. 3 shows a control circuit block diagram of this embodiment.
21 is a CPU (central processing unit) mainly composed of a microcomputer; 22 is a ROM (read-only memory);
23 is RAM (random access memory), 24 is
LED ()A photodiode) for displaying the number of copies, and
25 is an I/F (interface section), which connects the CPU 21.
This is for connecting the ROM 22, RAM 23, etc. and external input/output devices. 26 is a printer (copying machine) control circuit, 27 is a printer section, 28 is a + (plus) key for setting the number of copies, 29 is a - (minus) key, and 30 is a black button (for selecting a copy color (developing device)). 31 is a black (black) key, 31 is a same (red) key, 32 is a group key for setting the number of copies, and 33 is a print key for copying.

Next, the operation of this embodiment in one or more configurations will be explained with reference to FIGS. 1 to 4. FIG. 4 is an operation sequence flowchart of this embodiment.

An example in which regular original copies are colored black and sorted copies are colored red will be described. first.

Place multiple originals on a document feeder (not shown), and use the + key 28 (and/or - key 29 together)
Set the number of copies by pressing until the desired number of copies is displayed on the LED 24. jXX cocopy color, black key 30
Select black, and then press the group (number of copies) key 32.
When the user presses the button to set the group copy mode and then presses the print key 33, the CPU 21 determines that the document placed on the document feeder is to be group copied, and sends a command signal to the print control circuit 26 and printer section 27. Then, the second development I! (Red) 4.

It is set via the conversion cam 9, and the first sheet is first sorted into a full red (so-called solid red) copy (for the purpose of explanation, it is a solid red copy, but a half or partial red copy is also acceptable).
When this is completed, the second developing device 4 is released and the first developing device is replaced.
The developing device (black) 3 is set using the eccentric cam 8. With this, the original on the document feeder is properly copied in black. When this copying is completed, the first developing device (black) 3 is released and the second developing device (red) 4 is set in preparation for copying the next group. Sort by this.

Make another copy in red, then use the second developing device 4.
After releasing the first developing device (black) 3 and setting the first developing device (black) 3, the document on the document feeder is copied in black. Thereafter, the above-described operation is repeated until the set number of copies is completed.

As described above, copies different from the original copy color are inserted into the group (number of copies) sorting section, so sorting can be facilitated without using a sorter or the like.

Although the flowchart in FIG. 4 is exemplified in the case where black is used as the original copy color and seven colors are used as the copy color for sorting, it goes without saying that the colors may be the other way around. Further, the bypass flow in the figure shows the case of single copy, and since this flow is the same as the conventional example, the explanation will be omitted.

Further, in the above embodiment, the sorting copy is performed before the first copy of each group, but it is of course possible to perform the sorting copy after the last copy of the group.

Furthermore, although the above-mentioned embodiments have been described in the case of a two-color developing electrophotographic copying apparatus, the present invention is not limited to this, and may be applied to other image forming apparatuses using two or more colors that require this type of sorting. can also be applied.

〔effect〕

As described above, according to the present invention, an image is formed in a color different from the original image forming color between each copy. It is now possible to easily sort by number of copies at low cost without the need for expensive equipment such as.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the general configuration of one embodiment of the electrophotographic copying machine according to the present invention, FIG. 2 is an explanatory diagram of the operation of the first/second developing device, and FIG. Control circuit block diagram of
FIG. 4 is an operation sequence flowchart. 1......Photoreceptor drum 3/4...
...First/second developing device 8.9...Eccentric cam 21...CPU

Claims (1)

[Claims] In a multi-color image forming apparatus, when performing image formation on a plurality of copies of a plurality of originals, an image formation is performed between each of the plurality of copies in a color different from the original image forming color. Device.