JPS5946659A - Image forming apparatus - Google Patents

Abstract

PURPOSE:To prevent image and color mackling of a synthetic image, by installing a conveying drum rotated equally in peripheral speed to an image bearing drum and subjected to application of voltage apart from said image bearing drum by a distance shorter than the length of a transfer sheet in its movement direction, and stably conveying said sheet by means of the electrostatic force of the drum. CONSTITUTION:The transfer sheet is pressed with an insulating drum 205 charged and rotated at a peripheral speed equal to that of the first photosensitive drum 101 before reaching it to prevent bending, and fed stably to the drum 101 by the electrostatic force of the drum 205, resulting in transferring the first image to the prescribed position of the sheet. This transfer sheet is fed to the second photosensitive drum 102 stably by the electrostatic force while being pressed with the drum 101 to transfer the second image to the prescribed position of the sheet. The sheet is stably conveyed likewise from here to successively transfer the images without causing image mackling.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for combining a plurality of images 1 [(
Image formation in which a composite image is formed on the transfer material by transferring the images of each drum onto the transfer material while moving the transfer port along the two image-bearing drums. related to equipment, e.g.)
The L image has multiple photosensitive drums.
,;1, each different image of Drano-1- is 1
The composite image is then transferred onto one transfer material and then transferred to the T-Photography System N'+".

Below, we will transfer the colored images onto one roll.
7Eb
-f copy t% 44 The present invention will be explained with regard to tr'i. The i32.riI is also applicable to the image synthesis device that forms .

Color electronic copy J' [equipment 1'] of J'('6: R (red), G (green), B (v') on J1 + photosensitive drano) A color image is formed by exposing one A-linonal image three times through a filter divided into three colors.In other words, after charging, exposing, JJ,! images for the first color, , transfer the undeveloped toner image to the transfer material, and remove any dirt left on the photosensitive drum.
[Clean the second color again); [Repeat the charging, exposure, development, and transfer steps in 2, and repeat the same steps 3 or 4 times as in F1 to create a color image. obtain.

In addition, since the original image is optically formed on the photosensitive drum, there is a laser on the platform where the image is formed using the video signal No. 1 [i, Kii No. 11] corresponding to each color. Using electric-to-optical conversion elements such as light, LF, and D, perform ``Niba-mi'' and ``Nihon-V''(child's).

In any case, the conventional method of forming a color image using a single toner image carrier involves passing through an electrophotographic process for one color exposure; The same process must be done for the immortal color.

Therefore, when printing three colors, C14 colors, or more, the print speed is slow and the transfer system for transferring to the transfer port is complicated. In order to eliminate this drawback, a method was devised in which a plurality of photosensitive drums were prepared for each color and printing was performed continuously. According to this method, there is no need to perform all electrophotographic processes for one color before performing the next color ray process, and the print speed becomes extremely fast.However, unlike one drum, this method uses multiple One drawback is that the drums tend to cause color misalignment.

In this way, the color difference 1 of each color that occurs in the image created by overlapping the colors of the image, and generally speaking, dl
, a plurality of images are transferred to a transfer opening to form one composite image, and the transferred images are mainly It is caused by "tawami". The cause of this "tawami" is thick 6JK-C.
, there are the following two.

(1) The transfer force at the transfer port is weak.

(2) The transfer 4N is transferred to the belt portion (iJ), and is attracted to the parts such as the cornice around the iJ, such as the S11.

The unexploded IJ-1 eliminates the drawbacks of the conventional image forming apparatus 1') described above, increases the printing speed by using a plurality of both images J', !1r4 Drano. To form a composite image with a clear angle by preventing the transfer image 1; The purpose of this project is to provide an image forming bag jar' that can be used as an image forming bag.

Characteristics of the image forming apparatus according to the present invention ,
The difference between the length of transfer + A in the moving direction is 1'iM 11
'1, both ('k l'j'j on the holding drum?1n1-
Even when rotating with Ibaramen IJ [111〒11F applied or IY electric current sent Ill sending 12 Rano t'Σtrr(, te, transfer('' is at least 2 pieces including internal work carrying 1・゛ram) The transfer port is stably conveyed by the drum's electrostatic force in contact with the storage drum, and as a result, both images I' and 'lIl of the color electrophotographic apparatus are transferred. The purpose is to eliminate color shift.

Hereinafter, the present invention will be described as follows:
The explanation will be given with reference to the drawings, taking as an example the lifting platform that was built on the +I:'J river.

<T; Figure 1 (d, '#: 'l i'i, conventional color 11-mole photographic device 1 with photosensitive drum (#l))
Show ゛. In the figure, 101.102°103, ],
I) 4 &, l Arranged for each color [Pi-Silda Photosensitive Drum, 105, I O6, 1, (17, 1,08←Includes L Sugiyana/-De:]-Knit, 109 & Yo Transfer ( Paper feeding force that supplies 1, i i O, 1
,11,], ], 2.

113 is a transfer (transfer) supplied from the paper feeding power nut unit;
Transfer moonlight that detects -jI'lii beyond l: ri1ko detection 22;, 114゜115, 1], 6, l
17 is transfer band jb, Ar:, 118 rJ: transfer i4
] To send it to the general public! ';l':i+! 141>
y:'; Hair A/l i r-1, +4C feed chain, 119 is the conveyor belt or (general feed chain)
'g (=Jntagrino-gu-indicates J0 Sat ht: each /i p light drum], 0 ], , I 02, ]
03, I As is well known, there is a band around O/I.
■1, fog light, current 1;, process unit for transfer and cleaning is installed! '1', toner f'+: corresponding to each color is formed on each photosensitive drum. The transfer opening is fed with a paper feed angle of 10≦), i+f'+, and the transfer material tip detector 11.0 is detected.

Detector 1 ], O's 1-it signal → 3. It is sent to the laser unit 105 which includes a laser scanner, and by turning on the laser driver, a color image corresponding to the first color is irradiated onto the photosensitive drum 101, and the first color is placed on the photosensitive drum 101. A toner image is formed, and this toner image is transferred to a predetermined position on the transfer substrate. Il the first color toner image
Transfer material t", then (grino/'? for double feeding)
-119 to the photosensitive drum 102.

At this time, the leading edge of the transfer material is detected by the transfer material tip I step 111, and the tip of the transfer material is detected by the laser unit 1106, and a color corresponding to the second color is detected. The No. 15 image is irradiated onto the drum 102 of the photosensitive drum C, and the second color toner image is transferred to the fixed position of Phi on the transfer A:T. As a result, the transfer moonlight ☆;^1 is detected by the transfer phase detectors J, 12, and 113, which are arranged for each color, and the number 43 is transferred to the Ray unit I O7, 1.
.

In order to increase the transfer efficiency of the developer when the transfer material moves on the photosensitive drums 101 to 104, transfer bands Nlj,'V::'i ] ] 4 to 117 are installed on each drum, and The transfer material is electrically charged.

As mentioned above, the photosensitive drums 101 and 10 are transferred by the gripper 119 attached to the conveyor belt 118.
2, 103, 104. In this case, almost no color shift occurs at the leading edge of the transfer material due to the action of the detectors 110 to 113, but color shift may occur from the center to the rear j'iM portion of the transfer material. This is due to the difference between the speed of the gripper and the surface speed of the photoreceptors 101 to 1040, and the "deflection" of the transfer 71 due to the electrostatic force of the electric devices 114 to 117. /l into, r
7v of the drums at both ends of the jJ number of drums,
If the distance between the drums and the distance between the drums is longer than the length in the moving direction of transfer +/(, the color shift will be large. This is because if the length of the transfer material is longer than the distance between each drum, The ``deflection'' of the transfer material is held down by the electrostatic force of the drum at multiple points θ, but when the two ends of the drum are combined and the transfer (when the length of J in the moving direction is 6 shorter than the distance between each drum) This is because the transfer material can only be held down by the static Tg5 force at one D[.

Figure 2 01 Color 'ili shown in Figure 1, child photographic device 1
Part 7f of the present invention that improves the above-mentioned drawbacks in ``1''
Here is an example. In FIG. 2, parts similar to those shown in FIG. 1 are indicated by the same reference numerals, and detailed description thereof will be omitted.

In the embodiment shown in FIG. 2, a photosensitive drum 1 (11.

The first character in the columns 102, 103, and 104 is L.
In front of the drum 101, a charged drum 205 is installed at a distance fj, which is a distance 1'+'li longer than the length of the transfer material in the sliding direction. In the embodiment shown, the drum 205 consists of an insulating layer 205 with an insulating layer 1'' arranged opposite thereto.
Suspended and electrified by 20 G. Ha-hai drum 2f) 5
In the same way as the optical drum 101, the r
It is rotated f(+, re) at a surface speed equal to the surface speed of the l/h optical drum 101.

This collar 7 (f, at the lower J'13 device 1'1 degree, the paper feed unit - double charger 206 comes into contact with the electrically charged insulation 11 pin A205, and then the transfer month tip detection switch 110 A charger 206 is applied to the photosensitive drum 101 at a distance of 1 m.
may be a charger similar to the transfer charger 114 or A C
M electric appliances are also acceptable. However, as mentioned above, 1'rx between the photosensitive drum 101 and the 1st bond 205 is the transfer H.
In addition, the insulating drum 205 is driven to rotate in the same manner as the photosensitive drum 101, and the surface speed of the drum 205 is the same as the surface speed of the photosensitive drum 101.

Ichihi, ζThis person is at the peak of his ability.
, Drano, σ) At the beginning (7) of the row (7), just before it reaches the photosensitive drum 101, a forceful surface force is applied to the photosensitive drum.
It is pressed down by the electrically powered insulated drum 205 and transferred to the transfer material.
: The occurrence of "sway" that occurs when the conveying force is weak is prevented, and the photosensitive drum 1 is stably conveyed by the stationary force of the drum 205, so that the photosensitive drum 1
0 1 K i's and 7yL constant position R' on the transfer material
1', the first two images are shaped like I. Photosensitive drum 101
The image is shaped like Jk, inside i'7;'
, while being held down by the one-tone optical drum 101, is stably conveyed by the photosensitive drum 102 dimension by its electrostatic force, and a second image is formed at the desired position (:'+') on the transfer material. , Similarly, the transfer rollers are stably conveyed to the respective photosensitive drums 103 and 104, and tl'λ3 and the fourth iTii image are formed one after another without causing any image shift, resulting in a clear image. Form 111 compositions.

3M shows another embodiment of the present invention. The embodiment shown in FIG. Parts similar to those shown in FIG. 1 are indicated by the same reference numerals. However, the part shown in FIG. rjj, + is created so as to synthesize the three images.

In the embodiment shown in FIG. 3, three photosensitive drums 1, 01
, 102 , 103 as shown in the figure.
, 322, 323, 324 and conductive drum: 325, 3
26 , 327 , :328 self f'please'', insulated drums 321 to 324) j2 'T1.Drum 325
The transfer '4J is caused to pass between the drums 325 to 328, and the fd:Ac voltage is directly applied to the conductor drums 325 to 328. Of course, the surface speeds of the insulating drums 321 to 328 are set to be the same as those of the photosensitive drums 101 to 103.

3, the transfer material is relatively short, and the 70 process units such as the developing device, charger, cleaner, etc. around the photosensitive drums 101, 102, 103 are relatively large, and therefore the transfer material is long. It is more effective if IL is applied to a table with long intervals, but s,
1. + L is also limited to this, so irJ, i. Zunawa 1f, transfer 1; electronics 114 tel, developer transfer 1
Since it is a charger that transfers to 4' and 4', the ``warp'' of 4' does not necessarily act in the opposite direction. Group-), 1llJ, even if the photographic material is longer than 1♀1 between the g optical drums, 321 to 328 are applied to f, l/il L,, conductor 1b1 domme 325 to 328. By appropriately selecting the voltage for transfer, the "sway" of transfer (A) can be eliminated.

Furthermore, 1 ゛ram placed between the photosensitive drums is not necessarily 7]
It is only necessary to set tri ft < 47 numbers. That is, a plurality of charged drums including photosensitive drums may be in contact with each other along the length of the transfer material. As a result, the transfer material becomes electrically charged, and the developer, cleaner, and stay hemorrhoids that support the main body around the transfer material are charged.
C1 will be prevented if it is attracted by and causes "sway".

Note that for the 1° insulation on the image side, means for rubbing and cleaning the surface may be used as necessary.

-Explanation/-3, then this post]Nyoru picture f1
: Formation device jf"31.'J, image 4.I'! J'j+
Separately, Doshino and J are equipped with a charged Drano. ++! ii Jul! By eliminating the deviation of about %l of the image f3 transferred from the drums j' and +J over the entire transfer image f3, it is possible to create a composite image of the image f3.

Figure 1 shows a conventional color electrophotographic apparatus 7 (l'
! 11, FIG. 2 is a side view showing an embodiment of the present invention that is used in a color electrophotographic device of the type shown in FIG. 1, and FIG. FIG. 4 is a top view showing one example of another machine of the present invention used.

101 , 102 , ] (+ 3 , ] 04・
... Photosensitive drum] 05, I (16, 107,'
l O8...Rede unit 1 (19...Supply A'4℃ supply unit 110
, i l 1 , 112 , 113 ... transfer material leading edge detection \XL , 14 , 115 , l I G , 117.
. . . Transfer equipment 118 . . . General conveyance belt or conveyance unit 119 . . . Gripper 205 .
, 3 2 4 ... 4-color border l'' Jim 3 2
5, 3 2 6, 3 2 7,
:3 2 8...7 Floating 'ichi 1 dora person L'[
+I:X
j

Claims (1)

[Claims] A plurality of image-bearing drums each carrying an image (,i
In an image forming apparatus which transfers the images on these drums onto the transfer material while moving the transfer port along the drums holding these images, a composite image is formed. , the upstream and downstream sides (1111, length of the transfer port in the moving direction of the transfer 44) of both image-bearing drones, and the toner image f' at a short interval fi'f. An image forming apparatus in which a charged drum is rotated at a surface speed equal to that of a holding drum and a voltage is not applied to the drum, and a charged drum is distributed.