JPS6139077A - Formation method of superposed picture - Google Patents

Abstract

PURPOSE:To superpose a fixed toner picture to a transfer material on which distortion has been already generated and to obtain a precisely superposed picture by previously making the transfer material clear and then passing the transfer material through a fixing means. CONSTITUTION:A latent image formation process is not executed in the 1st carrying process and transfer paper 2 kept clear on its copying surface side is sent to a fixing means, unevenly expanded/contracted by a heat roller 14 and a press roller 15 and stacked on an intermediate tray 31 under the state that so-called distortion has been already generated. Then, the transfer paper 2 is fed to a drum 10. Since an electrostatic latent image formation process is in the working state at that time, the toner image of the 1st original is formed on the transfer paper 2 in accordance with the normal single side copying operation and the transferred paper 2 is carried to a fixing means by a carrying belt 13. When a copying start signal for the 2nd original is applied after setting the 2nd original on an original setting board, the transferred paper 2 waiting on the intermediate tray 31 is carried to the drum 10 similarly to the 1st original copying operation and the toner image of the 2nd original is transferred to the picture copying surface side of the 1st original and then the copied paper 2 is carried to the fixing means.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a superimposed image forming method in which images of a large number of original documents are superimposed to obtain a single image.

(Background of the Invention) Conventionally, a method for stacking a large number of documents, for example, two documents to form a single image, involves creating a latent image on an image holding member with the first document, and then developing it. 1 on this image holding member
After the toner image is transferred to one transfer material, it is fixed, and then the second
There is a method in which a latent image is formed and developed on a sheet of original, and the toner image on the image holding member is transferred again to the transfer material.

However, in such a method, once the transfer material passes through the fixing device, it is dried and compressed and expands and contracts unevenly, which tends to cause misalignment between the preceding image and the subsequent image. there were.

(Object of the Invention) An object of the present invention is to form a fixed toner image superimposed on one side of the transfer material by repeating the process of passing the transfer material visualized on the latent image carrier through a fixing means. An object of the present invention is to provide a superimposed image forming method capable of superimposing a preceding image and a subsequent image without any deviation to obtain an accurate superimposed image.

(Summary of the Invention) The gist of the present invention is to repeat the process of passing a transfer material onto which a developed toner image has been transferred onto a latent image carrier through a fixing means. In the superimposed image forming method for forming a fixed toner image superimposed on one side of the transfer material, the superimposition method is characterized in that prior to the above process, the transfer material is made in advance and passed through the fixing means in a blank state. In the combined image forming method.

(Embodiment of the Invention) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows an apparatus used to carry out the superimposed image forming method according to the present invention.
is a cassette stand, 2ii is a transfer paper stacked on a force set table 1, 3 is a paper feed row 5.4.5Fi conveyance guide plate, 6.7
is L/distro roller, 8, lt transfer section conveyance guide plate, 1
o is a photosensitive drum. Then, the transfer paper 2 is fed to the resist 0-56.7 by the paper feeder 0-ra 3, and the guide plate 4
．． 5 to form a loop. Thereafter, it rotates at a prescribed timing and is fed to a latent image carrier, for example, the photosensitive drum 10, by a cyst 0-56.7.

11 is a transfer charger, 12 is a separation charger, 13 is a conveyance belt, 14 is a fixing roller with a built-in heater, 15 is a pressure roller, 16u upper separation claw, 17 is a child separation claw, 18 and 19 are conveyance Guide plates 20 and 21 are paper discharge rollers, 22 is a paper discharge tray, and 23 is a flapper driven by a solenoid (not shown). The transfer paper fed to the photosensitive drum 10 is separated from the photosensitive drum 10 after transferring the toner image formed on the photosensitive drum 10 through a transfer charger 11 and a separation charger 12. The toner image is transported by the transport belt 13 to the fixing means, passes between the fixing roller 14 and the pressure roller 515, is heated and pressurized, and is fixed, and then passes through the transport guides 18 and 19 to the discharge roller 20. ．． '21, the paper is discharged onto the paper discharge tray 22. At that time, the transfer paper 2 that has passed through the fixing means is separated by separation claws 16 and 17.
It can be easily separated from the fixed fixing 0-514 and the pressurizing 0-515.

Incidentally, since the latent image formation process is well known, it will not be explained in detail here.

The above explanation is about the normal one-sided copying process, and the flapper 234
It has been rotated to the position shown by the solid line in the figure.

Next, the superimposed image forming step VC will be explained. In the figure, 25.26 is a conveyance guide plate, 27.28 and 29
．． 30 is a pair of conveyors 0-5, 31 is an intermediate toy,
Reference numeral 32 indicates intermediate tray paper feeding 0-5, 33, and 34 are conveyor kite plates, 35, 36 are conveyor rows 5, 37, and 38 are registration rows 5 having the same functions as the resistors 0-56 and 7. First, the operator selects the superimposed image function using a button on the operation panel, places the first document on the document tray, and sets the desired number of copies, for example, 2 copies per copy.
Select. At this time, the flapper 23 is rotated to the B position shown by the broken line in the figure, so that the transfer paper that has passed through the fixing means is guided to the conveyance guide plates 25 and 26. Then, two sheets of transfer paper 2 are sequentially fed from the cassette table 1 to the registers 0-56, 7 by the paper feeder 3, and then to the drum 10 by the conveyor belt 13 to the fixing means. sent to. In this first conveyance process, the latent image forming process is not performed, and the transfer paper 2Vi is sent to the fixing means with its copy side in a blank state. Then, the blank transfer paper 2 is heated and pressed by a heating roller 0-514 and a pressure roller 515, and then guided to a flapper 23 and transferred to a conveyor bite plate 25, 25.
and is loaded onto the intermediate tray 31. That is, 1
The transfer paper 2 stacked on the intermediate tray 31 during the second conveyance process is non-uniformly expanded and contracted by heating 0-514 and pressure [1-515]. The sheets are stacked on the intermediate tray 31 in a state where so-called distortion has already occurred.

Next, the transfer paper 2 is automatically transferred to the paper feed row 532 and the transport O-
The paper is fed to the registration row 537.3B by the registration roller 35.36, and the sheet is fed to the registration row 537.3B at a specified timing.
It is fed to the drum 10 with 38 rotations. At this time, the electrostatic latent image forming unit is in operation, and a toner image of the first document is formed on the transfer paper 2 according to the normal single-sided copying operation described above, and is transported to the fixing means by the transport belt 13. Ru. The position of the flapper 23 is maintained at position B even during the copying operation of the first original, and the transfer paper 2 that has completed the first image copying through the fixing means is again stacked one after another on the intermediate tray 31, and the second Waits until the original copy start signal is given. After setting the second original on the original placing table, when the copy button is pressed, that is, when a second original copy start signal is given, the transfer paper 2 waiting on the intermediate paper tray 31 is moved as described above. In the same manner as the first original copying operation, the drum 1
0, the toner image of the second original is transferred to the first original image copying side, and the toner image of the second original is transported to the fixing means.

Further, when a second original copy start signal is given, the flapper 23 is rotated from position B to position A, and the transfer paper 2 on which the toner image of the second original is fixed by the fixing means is transferred to the paper ejection roller 20. .21 and is conveyed to the paper ejection tray 22.

(Effects of Embodiments of the Invention) As described above, according to this embodiment, before forming an image on a document,
By passing the transfer paper as a blank sheet through the fixing means and causing distortion caused by evaporation or suppression of water in advance, distortion will not occur when it passes through the fixing means thereafter, so that the image of the second original is transferred to the transfer paper. It becomes possible to copy the image so that it overlaps with the copied image of the first original at a desired position,
The effect of forming accurate superimposed images can be obtained.

Note that although this embodiment has explained overlapping copying,
It may also be applied to compositing parts of a document or copying multiple images by changing the color of the image.

Further, although two originals, the first original and the second original, are superimposed on the transfer paper, more than that may be used.

(Effects of the Invention) As described above, according to the method of the present invention, it is possible to superimpose a fixed toner image on a transfer material in which distortion has already occurred, so that an accurate superimposed image can be obtained.

[Brief explanation of the drawing]

FIG. 1 shows a schematic diagram of the apparatus used to carry out the superimposed image forming, force forming method according to the present invention. 1...Cassette stand 2...Transfer paper 3...Paper feed 0
-Ra 4.5... Conveyance guide plate 6.7... Resist 0-5 8.9... Pre-transfer conveyance guide plate 10... Photosensitive drum 11... Transfer charger 12...
・Separation charger 13...Transport belt 14...Fixing 0
-515...Pressure 0-516.17...Separation claw 18.19...Transport guide plate 20.21...Sheet discharge 0-5 22...Sheet discharge tray 23...Flapper 25 .2
6... Conveyance guide plate 27.28.29.30... Conveyance o-531... Intermediate tray 32... Intermediate tray paper feed roller 33.34... Conveyance guide plate 35.36. ...Conveyance row 5

Claims (1)

[Claims] In a superimposed image forming method in which a fixed toner image superimposed on one side of a transfer material is formed by repeating a process in which a toner image visualized on a latent image carrier is transferred as a transfer material and passes through a fixing means. . A superimposed image forming method, characterized in that prior to the above process, a transfer material is prepared in advance and passed through the fixing means in a blank state.