JPS61275867A - Image forming device - Google Patents

Abstract

PURPOSE:To make the formation of multi-color images without positional deviation possible by providing a means for detecting the rates of the positional deviations corresponding respectively to the moving direction of a material to be transferred and the direction orthogonal therewith and storage means for storing the rates of the positional deviations. CONSTITUTION:The rate 1x of the horizontal positional deviation of the paper P fed to a copying machine A and the rate 1y of the vertical positional deviation are detected by the 1st and 2nd optical detectors 130, 134. The rates 1x, 1y are stored in a quick disk Qd. The error between the rate of the positional deviation stored in the disk Qd of a copying machine B and the rate of the positional deviation to be detected in the machine B is determined and a lens block for variable powers is moved in accordance with the error at the same time,the operation timing of a resist roller pair 19 is shifted, then the copying operation is executed. The formation of the image complying with the reference position of the paper is thus made possible even if the position of the paper to be supplied to the transfer part deviates horizontally or vertically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus applied to, for example, an electronic copying machine.

[Technical background of the invention and its problems]

Generally, in a copying machine that has different color developing units independently, the content of the original is overlapped, that is, after copying is done with a copying machine equipped with a black developing unit, a copying machine with a red developing unit is used. A system that overlaps the contents of manuscripts has been developed.

By the way, with the above-mentioned copying machine, if the paper is misaligned in the vertical and horizontal directions when copying first, the next copy will be made without taking this misalignment into account. There is a problem.

(Object of the Invention) The present invention has been made in view of the above circumstances, and its object is, for example, to form an image using developing devices of different colors between two or more image forming apparatuses. In this case, it is possible to compensate for the vertical or horizontal positional misalignment of the transfer material with respect to the document on which the image was previously formed, when performing image formation in the next image forming apparatus.
It is possible to form multi-color images with minimal vertical or horizontal positional misalignment e), forming high-quality images.
There is a system C which attempts to provide an image forming apparatus capable of performing four functions.

[Summary of the invention]

This defense can be traced back to the case where 11 images are formed using developing devices of different colors between two or more image forming apparatuses, and for example, an optical detector is installed near the register 1 roller. −
It detects the vertical or horizontal positional deviation of the J1 set, and also detects the paper Il detected by this detector.
1) Store the data in a removable storage medium lζ in a quick disk, set this quick disk in another image forming apparatus, and transfer it to another image forming apparatus. In the state where the paper is fed in a lit position, the paper feed rate or exposure scanning timing is controlled according to the positional deviation stored in the quick disk. , an image has already been formed, and the image formation IQ position for the two sets is complemented 1F-4-b.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

4 to 7 schematically show image forming apparatuses of the present invention, such as copying machines A and B. That is,
Reference numeral 1 denotes a main body of a copying machine, and a document table (transparent glass plate) 2 is fixed to the upper surface of the main body 1 to support a document. A fixed scale 21 serving as a reference for the document is mounted on the document table 2, and a document knob bar 11 and a work table 12, which can be opened and closed, are provided near the document table 2. .

Further, an operation panel 3 is sprayed with acid on the upper surface of the main body 1, and a quick disk device 30 is provided on this operation panel 3. This Quick Disc M 30 is an ink disc.
When the button 301 is operated, the recovery 302 is opened as indicated by the dotted line.
In this state, the quick disk Qd, which is a rotatable magnetic recording medium, can be inserted and removed.

Further, this quick disk device 130 is detachably attached to the main body '1, as shown in FIG. 'cJ
That is, a connecting terminal 303 is provided protruding from the side surface of the quick disc device 30, and this connecting terminal 303 is inserted into and removed from the insertion opening 13 provided in the book 141. When the connecting terminal 303 is inserted into the insertion port 13, one connecting terminal f is connected to a connecting portion (not shown) provided inside the main body 1.

Furthermore, as shown in FIG. 6, a storage section 14 for a quick disk Qd is provided on the front surface of the main body 1. This storage section 14 is as shown in FIG.

The interior is made up of a metal shield case 15, for example, and a holding member 16 for holding the quick disc Q (1) in an upright position is provided inside the shield case 15. 7 covering 14
] The bar 17 has an installation frame that can be opened and closed freely.

Further, the quick disk Qd stores information such as operation information in advance, and also stores the amount of paper deviation (l x, ly ), which will be described later.

On the other hand, as shown in FIG.
．． 6.7. An exposure optical system consisting of a lens block 8 and a fixed mirror 9 movable in the optical axis direction is provided, and by optically scanning the document surface with this optical system,
The image of the original is formed on the surface (slit exposure). The photosensitive drum 10 rotates in the direction of arrow C in the figure, and its surface is first charged by the charging device 11.
The image is then exposed to slit light to form an electrostatic latent image on the surface. This electrostatic latent image is made visible by applying toner by a developing device 12. Note that the developing device 12 in copying vs.
is for black color, and the developing device 12 in copying machine B is for red color.

On the other hand, the paper (image-forming object) P is taken out one by one from the selected upper paper feed cassette 13 or the lower paper feed force cera 1 through -0-14 (via 1-915 or 16). , is guided through the inner path 17 or 18 to the resist [1-ra pair 19], and this register (~1"
41 are guided to the transfer section by 1-R pairs 19. Here, 1-recording force set I to 13.17'I
is removably attached to the lower right end of the main body 1, and either -h can be selected on an operation panel (not shown). <7 Oh, I-Name feed h
Lets 13 and 14 are connected to force sensor 1 to force detection switch 60+ and 602, respectively -C7Jt? ] The helicopter is detected. These cullet rise detection switches 60t and 602 have 11 different sizes.]
・A plurality of microphones 1 and 1 are turned on and off in response to the input of the microphone.

Thus, the paper P sent to the transfer section is transferred to the transfer charger 2.
Due to the action of the charger 200, the photosensitive drum 1 (1) is brought into close contact with the surface of the photosensitive drum 10 at the portion 0
, 1-0 Tonneau-m is transferred. The transferred paper P is electrostatically peeled off from the photoreceptor drum 10 by the action of a peeling charger 21 and conveyed on a conveyor belt 22, and is placed on a stage 1 at the end of the conveyor belt 22, and is placed on a heat roller 23 as an Ic fixing device. The transferred image is fixed by passing through this area. After fixing, the MP is discharged onto a tray 25 outside the main body 1.

Further, the photoreceptor drum 10 after the transfer is transferred to a charger 26 for removing static electricity.
After the charge is removed by the cleaner 27, residual toner on the surface is removed, and the afterimage is erased by the charge removal lamp 28, thereby returning to the initial state. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

Figure 9 does not show the operation panel 3 installed on the main body 1. 31 is the copy 4 = -132 which commands the start of copying.
is a display section consisting of, for example, a liquid crystal driver 1 to a matrix display, and the display information stored in the quick disk Qd is switched and displayed according to each mode. Around this display section 320, depending on the display mode, for example, there is a numeric keypad for setting the number of copies or an fA for setting the copy magnification.
l Setting key.

The power to select IR for the 1st stage and lower stage paper feeding power Z13.14? A plurality of setting keys 3a to 3r, which are set to 16 functions different from the selection keys, etc., are arranged 1iQt''J.

An example of the drive source configuration of each drive unit of a copying machine configured as shown in FIG. That is, 31 (J lens motor) is a motor for moving the position of the lens block 8 for changing the magnification by 1!'. 32 is a mirror motor for changing the magnification. Distance 11i11 (optical path length) between mirror 5 and mirror 6.7 for i11
This is a motor for changing the

A scanning motor 33 is a motor for moving the exposure lamp 4, the mirror 5, and the mirror 6.7 for scanning the original. 341, Shatta Tanabata...
Yes, there is a screen 1 for adjusting the charging width of the photoreceptor drum 10 by the charger 11 during zooming. This is a motor for moving ivy (not shown). 35 is a developing motor, and the developing motor 1g! [ ] - This is a motor for driving the 4T etc. 36 is the drum motor (・
Yes, this is Tanabata for driving the photosensitive drum 10. 37 is a fixing motor, which connects the paper conveyance path 20 and the fixing roller pair 2.
This is a motor for driving 1.

38 is a paper feed motor, and the feed []-ra 1711
~143. This is a motor for driving 151 to 153. 39 is a paper feed motor, and the resist [1-
This is a septa for driving the rotor pair 17. 40 is a fan motor for driving the cooling fan 29; 401 is a pair of rollers 24.28b, 28c, 28;
This is a motor for driving d, etc.

FIG. 11 shows a driving mechanism for reciprocating the optical system. That is, the mirror 5 and the exposure lamp 4 are supported by the first kittridge 411, and the mirror 6.7 is supported by the second carriage 422.
The seven ridges 411 and 412 are guided by guide rails 421 and 422 and are movable in parallel in the direction of arrow a.

That is, the 4-phase pulse motor 33 drives the pulley 43! 1II
Ill.

Endless bells 1 to 45 are disposed between the pulley 43 and the idle pulley 44, and one end of a first carriage 41+ for supporting the mirror 5 is fixed to a midway portion of the belt 45. On the other hand, two pulleys 47.47 are rotatably installed in the guide portion 46 of the second carriage 422 that supports the mirror 6.7, spaced apart in the axial direction of the 17-rule 422. Wire 4 between .47
8 is hanging. One end of this wire 48 is connected to the fixed part 4
9, the other end is fixed to a single fixing portion 49 via a coil spring 50. Also, -1-Wai A
One end of the first carriage 411 is fixed to the middle part of 748. Therefore, when the pulse motor 33 rotates, the bells i to 45 rotate and the first carriage 4
1+ moves, and the second carriage 422 moves accordingly.
also move. At this time, pulley 47.47 is 1 of the movable pulley.
In order to make 9 stitches, the 2nd carriage is
The carriage 422 moves in the same direction at 1/2 speed.

The moving directions of the first and second carriages 41+ and 412 are controlled by switching the direction of rotation of the pulse motor 33.

Further, the copyable range corresponding to the designated sheet is displayed on the @ stacking table 2. That is, if the paper 4 noise specified by the paper selection key is (P x, Py) and the copy magnification specified by the magnification setting key is K, then
Copyable range (X, V), rx=Px/KJ, ry=P
It becomes y/KJ. Of this copyable range (x, y),
The X direction is displayed by a finger button 5L 52 provided on the back surface of the document table 2, and the X direction is displayed by a scale 53 provided on the upper surface of the first carriage 411.

The above pointers 51 and 52 are connected to the pulley 5 as shown in FIG.
4.55, and is provided on a wire 57 that is suspended via a spring 56. The pulley 55 is connected to the motor 5
This motor 5
The distance between the hands 51 and 52 can be changed by rotating B in accordance with the paper rise and magnification.

Also, the first carriage 41! is moved to a predetermined position (home position according to the magnification) by driving a motor 33 according to the paper size and magnification. When the copy key 31 is pressed, the first carriage 411 is first moved toward the second carriage 412, and then the lamp 4 is turned on and moved away from the second carriage 412. When scanning of the original is completed, the lamp 4 is turned off and the first carriage 411 is returned to the home position.

FIG. 13 shows a drive mechanism for the conversion lens block 8. As shown in FIG. The motor 31 is connected to a first carriage 411
A lead screw 61 disposed along the moving direction (X direction) is rotated. Bushes 631 and 632 provided at one end of the male plate 62 are screwed into this lead screw 61.
1 is rotated, the substrate 62 is moved in the X direction.

A guide member 621 is provided at the other end of the substrate 62, and the guide member 621 is slidably engaged with the guide rail 64. Further, the substrate 62 includes a substrate 62 .
A movable body 65 is provided, which is movable in a direction (X direction) orthogonal to the above, and to which the variable magnification lens block 8 is attached. That is, supports 65s are provided at both ends of the moving body 65.
, 652 are provided, and this support 651.652
are guided and held by guide members 661 and 662 provided on the substrate 62. Further, a rack 653 is provided on the longitudinal side surface of the support body 651, and a pinion 68 rotated by a pulse motor 67 provided on the base plate 62 is meshed with this rack 653. Therefore, the variable magnification lens block 8 is operated by the motor 67.
is moved in the X direction by being driven. The microswitches 69r and 692 are for detecting the initial positions of the substrate 62 and the moving body 65, respectively.

Next, the relationship between the operation of the variable magnification lens block 8 and the image formed will be explained. In FIG. 14(a), the focal length of the variable power lens block 8 is f, the optical path length from the document table 2 to the variable power lens block 8 is ya, and from the variable power lens block 8 to the photosensitive drum 10. If the optical path length is yb1 and the total optical path length from the document table 2 to the photosensitive drum 10 is yc, then the optical equation is expressed as follows.

1 / f -1/ V a + 1 y'y b Also, the magnification] (is expressed as K = yb 7' V a . The focal length of the variable magnification lens block 8 is 1Il
Since lf is constant, it can be seen that in order to focus during zooming, it is necessary not only to change the total optical path length yc, but also to change ya or yb. This ya
, yb can be changed by moving the variable power lens block 8 in the X direction. Also, the total optical path length y
c moves the second carriage 412 to remove the mirror 6.7.
It can be changed by changing the position of.

On the other hand, as shown in FIG. 14(b), the distances between the document table 2, the variable magnification lens block 8, and the photosensitive drum 10 are kept constant, and the variable magnification lens block 8 is moved in the X direction by the motor 67. For example, the distance
The 0-V image is moved by a distance x 2 expressed by the following equation.

x2-Xl xyb,/ya Also, in the case of equal size copying, X2 = 2Xt. In this way, by moving the variable magnification lens block 8 in the X direction, the center of the copied image can be moved.

FIG. 15 shows the overall control circuit, including the main processor group 71 and the main processor group 71. 2nd subprocessor group 72.73
It is mainly composed of. The main processor group 71 includes an operation panel 3 and various switches and sensors, such as the cassette size detection switch 60+, 602, 603.
a high-voltage transformer 76 that detects input from an input device 75 such as, and drives the various chargers; the static elimination lamp 27;
The blade solenoid 26a of the cleaner 26, the heater 21a of the pair of fixing rollers 21, the exposure lamp 4, and each of the motors 31 to 40, 58, 67, etc. are controlled to perform the above-described copying operation. The optical detectors 130, 134 and memories 137, 142 of No. 2 are used to detect deviations in the horizontal and vertical positions of the paper, and adjust the position of the image to be formed on the paper according to the detected state. The display section 32 is controlled by controlling the quick disk device 30 and the memory 142. Further, the main processor group 71 is configured such that the storage contents of the quick disk device 30, that is, the guidance display data and the positional deviation 1 (lx, ly) are stored in the memory 142.

The above Quick Disc M30 is a Quick Disc Q
A motor 173 that rotates Qd at a constant speed, and a reading head 1 that loads or reads data into or from the quick disk Qd that rotates at a constant speed.
74, etc.

Note that details of the first and second optical detectors 130 and 134 will be described later.

Among the above motors 31 to 40,58,67, motor 3F
z, 352.37, 40.401 and the 1-ner motor 77 that supplies 1-ner to the current acidifier 12 is controlled by the main holder group 71 via a motor driver 78, and the motors 31-34. 67 is the pulse motor driver 7
The motors 36, 39° 38.58 are controlled by the first sub-processor group 72 via the pulse motor driver 8.
It is controlled by the second sub-processor group 73 via 0 and 1.

Further, the exposure lamp 4 is controlled by the main processor 71 via a lamp regulator 81, and the heater 21
a is connected to the main processor 4J group 7 via the heater control section 82.
Controlled by 1. And main processor 1! $7
1 to 1st. Commands to drive and stop each motor are sent to the second sub-processor group 72 and 73, and status signals indicating the drive and stop status of each motor are sent from the first and second sub-processor groups 72 and 73 to the main processor group 71. It will be done. The first sub-processor group 72 also includes motors 31 to 31.
Position information from a position sensor 83 that detects each initial position of 3/1.67 is input.

FIG. 16 shows seven configuration examples of the main processor group 71. Namely, 911. , tl non-chip microcomputer (simply abbreviated as MY-1 after 1),
Via the Okawa J-Boat 92, various display controls (I<E) are performed using keys on the operation panel (not shown).

Maruko, \'-(Con 91 is a crowded Kapo-1~93~96
It has been extended with J. A high-voltage transformer 76, a motor driver 78, a lamp E nokicolator 81, a filter 81, and other outputs are connected to the passenger boat 93, and an input/output boat 94 is connected to a paper rise detecting device 1J.
The IJ switch and other human power are connected, and the IJ image condition setting switch and other human power are connected to the human output boat 91.

Note that the input/output boat 96 is for the A busine.

FIG. 17 shows an example of the structure of the first rib prosthesis 72. 1(')1 is a microcomputer, which is connected to the main J Rosselli group 71.

102 is a program for controlling the phase switching interval time of the pulse motor.
It is a grammar interval timer, and microcontroller 1
As the setting candy is changed from 01 to 1 to 1, a 1J untoshi, 1 to 1 to 1 to 1 end pulse is outputted to the F+11 included line of the microcomputer 101. ) = The timer 102 receives a pulse according to l:LM. Further, the microcomputer 101 receives position information from the position P unit 83 and is connected to input/output boats 103 and 104. Then, motors 31 to 34.67 are connected to the input and output horn boats 1 to 104 via the pulse motor driver 79.

In addition, the input/output capo-j-103 above is the main input/output card for each pulse Tanabata status bow.
\Used when outputting.

FIG. 18 shows the configuration 4 of the second rib processor 73. That is, '111' is a microcomputer, which is connected to the main 1[] Pisa group 71. , 112 is a -1 [1 Grammar Interval Timer F] for controlling the pulse smoke phase switching interval time, and the microcomputer 111
When the setting value is changed from 1 to 1, a termination pulse is output based on the input value. This termination pulse is latched by the latch circuit 113, and its output is The input/output capo 1-11/'I is connected to the interrupt J line and the input/output capo of the main line 111. Motors 36, 38, 3 are connected to the input/output capos 1 to 11/I via the pulse motor driver 80.
9.58 is connected.

Figure 19 shows the control circuit of the pulse motor.
-jO-1, 114) is connected to a pulse motor driver 122 (corresponding to pulse motor driver 79, 80 in FIG. 12), and this pulse motor driver 122 is connected to a pulse motor 123 (the pulse motors 31 to 34. 3
6.38.39.58.67) 8 windings A, B,
A, 13 is connected.

Figure 20 shows a j* degree sub-control method for a pulse motor. Figure (a) is the speed curve of the IJ pulse motor,
The figure (b) shows the phase switching interval. As is clear from this figure, the phase switching interval is long at first, gradually shortened, and
Eventually, they become evenly spaced and gradually become more dense, reaching 1,411 peaks. However, this indicates slew-up and slew-down of the pulse motor, starting from the self-starting region to 1-1.
This means that it is used in a high-speed region and eventually stops. Note that tl, t2...tx indicate the phase switching interval time. l.

Next, the main parts of this invention will be explained. In this embodiment, it is possible to correct paper misalignment. That is, as shown in FIGS. 1(a) and 1(b), in front of the register I to the roller pair 17 with respect to the traveling direction of the working MP, there is a sensor for detecting the lateral (i7-it deviation) of the working MP. The first optical detector 130 is installed.
0 is constituted by a light-emitting element 131 and a light-receiving element group 133 including a plurality of light-receiving elements 132, which are arranged at predetermined intervals in a direction perpendicular to the front and back sides of the paper P, for example. The light receiving element group 133 is shown in FIG.
), a plurality of light receiving elements 13 are arranged in a straight line.
2 is aligned with the transport reference position ST of the paper P.

Therefore, if the paper P deviates from the reference 11 "I 100 S" as P2 or P2 = 22-, the light receiving element 8\13
In order to form the foundation for the revenge of 3, this is the × on the paper P.
It is possible to detect 1m1x in the direction of (17°)
·be. Preferably, this detected (C! Place - M based on lx, if the copy 18 rate is the same size, the previous tf14
Use the variable magnification lens and move the ntsuk 8 in the x direction l x , -'
2, move IJ, etc. 11 (in the case of 1, 1), find the compensation iE IjA by the method described above, and follow this correction.
> 7, if you move [Nonzubu 1] Tsuk 8 for variable magnification,
It is also possible to form an image "Y" at the reference position of the paper.

Moreover, there is a positional deviation (hereinafter, longitudinal A second optical detector 134 is provided for detecting the positional deviation (referred to as the positional displacement). This detector 14 is composed of a light-emitting water droplet 135 and a light-receiving element 136, which are spaced a predetermined distance from the resistance 1-roller pair 19, and are spaced a predetermined distance from each other on the front and back sides of the sheet [ ]. .

In this case, J3 is in the vertical configuration, and the paper P is misaligned in the vertical direction (after the paper P is taken out from the paper feed cassette 13. , is determined by the temporal timing. That is, when the copy key 31 is operated, the delivery roller 15.1
The pair 19 is driven. Among the motors that drive these rollers, the motor 39 that drives the register 1-roller pair 19 is a pulse motor as described above, so the main processor group 71 calculates the number of pulses supplied to this motor 39 by 81. , if these four numbers are stopped in a state where the leading edge of the paper P is detected by the second optical detector 134, the paper P is determined from this H1 value.
The distance traveled can be found.

Therefore, by setting a reference value corresponding to the moving distance of the paper in advance, it is possible to determine the error (vertical positional deviation fly of the paper P) with respect to this reference value.

In the above configuration, the operation will be explained with reference to the flowchart shown in FIG. 2 and the operation state diagram shown in FIG. When the copy key 31 of the operation panel 3 is pressed after the original to be processed is placed, the main processor 4jR\71 displays the J-NO[]- as shown in FIG.
Operation control is performed from step 1 to step 6.

In other words, 15, in step S1, paper P is fed from the selected paper feed cassette, and in step S2, the first
, second optical detectors 130 and 134 detect displacements lxl and lyl of the MP in the lateral force direction and the vertical direction. The detected positional deviations MIXt, lVt are stored in the quick disk Qd in step S3. Thereafter, in step S4, a normal copying operation is performed. When this copying operation is completed, in step S5, the paper P on which the black copy a has been made is ejected to the tray 35, and all operations are completed. After one copy, copying is performed on the other sheet 1 in the same manner, and the positional deviations MIXt and IVI are also stored in the quick disk Qd. Then, take out the quick disc Qd (
S6).

After that, for example, place another original, that is, an original to be copied in red, on the original platen 2 placed in the copy 1 [3], and then
Insert the recording paper P into the paper feed cassette. In addition, the copy 1
The quick disk Qd used in 1A is set in the quick disk device 30 (S7). As a result, the stored contents of the reic disk Qd, that is, the amount of positional deviation, are stored in the memory 142.
is stored <S8).

When the copy key 31 is operated, the main processor group 71 performs operation control according to the flowcharts 1 to 14 shown in FIG.

That is, in step S1, at this time, in step 810, the horizontal and vertical positional deviation lx of the sheet P is again determined.
2, lV2 is detected, and in step S11, this detected positional deviation suspension IX2. lV2 and the memory 1
The positional deviations Jilxl and lVx stored in 42 are subtracted, and the error EX=(lX+-1x2 >, Ey-
(IVI-1y2) is calculated. In step 812, the variable magnification lens block 8 is operated based on the calculated error Ex, and the image forming position is moved in accordance with the lateral positional deviation of the paper P.

In this case, the amount of movement of the variable magnification lens block 8 is EX/2 when the copying magnification is equal to the same magnification.

Thereafter, in step 3131, the copying operation is started, and at this time, the operation timing of the lenses 1-19, for example, λ, is changed depending on the vertical error Ey thus determined. , the timing of supplying the paper to the transfer section is changed.Therefore, the paper P has the same horizontal direction as before and this time.
An image is formed by correcting the vertical positional deviation. When this copying operation is completed, in step 814, the paper P h<
1 to 35, and all operations are completed.

In addition, if there are multiple copies to be made, first copy machine A.
The horizontal direction of each detected paper corresponds to copying in
The vertical positional deviations are each stored in the quick disk Qd, and the copied sheets are stored in the stacking section 28a. Thereafter, when copying is performed in the copying machine B, there are misaligned items detected corresponding to the sheets on which black copies are being sequentially supplied from the paper feed cassette to the transfer section, and the memory 142 (quick Errors are calculated from the amount of positional deviation stored on the disk Qd), and the image forming position is corrected according to this error.

According to the above embodiment, the first and second optical detectors 130 and 134 in the copying machine A detect the horizontal positional deviation llx and the vertical positional deviation Mly of the fed paper P, and Store these positional deviations llx and ly in the quick disk Qd, and calculate the error between the positional deviations stored in the quick disk Qd in another copy 111B and the positional deviation amount detected in this copy IB,
In response to this error, the variable magnification lens block 8 is moved and the operation timing of the registration roller pair 19 is shifted to perform the copying operation. Therefore, even if the position of the paper supplied to the transfer section is shifted in the horizontal and vertical directions, it is possible to form an image according to the reference position of the paper. This makes it possible to improve the quality of the copied images, especially when multiple copies are made using different copying machines, since positional deviations between the devices are taken into account and no deviations occur in the formed images. It is something.

In the actual example, a plurality of light receiving elements 132 were used as the light receiving element group 133, but the present invention is not limited to this, and as shown in FIG. 3, for example, a CCD line sensor (J140) may be used. With this configuration, it is possible to detect paper misalignment with high accuracy.

Furthermore, as a vertical correction (1 pair of registration rollers)
The present invention is not limited to the method of changing the operation timing of 9. For example, the timing of haze scanning may be changed with respect to the paper supply timing.

It goes without saying that various other modifications can be made without departing from the gist of the invention.

[Effects of the Invention 1] As detailed above, according to the present invention, for example, in an image forming apparatus in which two or more image forming apparatuses use developing devices of different colors, uniform formation is first performed. It is possible to correct vertical or horizontal positional misalignment of the transferred material with respect to the transferred original when forming images on the next image forming device. It is possible to provide an image forming apparatus that is capable of forming both edges and forming high-quality images.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of an image forming apparatus according to the present invention. FIG. FIGS. 4 to 6 are perspective views of the main parts of the optical detector, showing examples.
The figures are respectively an external perspective view showing the structure of the image forming apparatus, FIG. 7 is a side sectional view showing the main parts of FIG. 6, FIG. 8 is a side sectional view showing the structure of the image forming apparatus, and FIG. 9 10 is a plan view showing the structure of the operation panel, FIG. 10 is a perspective view showing the structure of the drive section, FIG. 11 is a perspective view schematically showing the drive mechanism of the optical system, and FIG. 12 is a perspective view showing the drive mechanism of the waste paper. 13 is a perspective view of the main part showing the structure of the lens block for variable magnification. FIG. 14 is a diagram for explaining the operation of the lens block for variable magnification. FIG. 15 (J) is a block diagram showing the overall control circuit, FIG. 16 is a block diagram showing the main processor group, and FIG. 17 is a block diagram showing the 11th processor IJ.
4M diagram, Fig. 18 is a block diagram without showing the 2nd if 7 process 1) group, Fig. 19 is a schematic block diagram showing the control circuit of the pulse motor, and Fig. 20 is the speed control of the pulse motor.
FIG. 21, which is a diagram for explaining the method, is a diagram for explaining the operating state. A, [3... Copying machine, 1... Main body, 2... Original table, 3... Operation panel, 8... Lens block for variable magnification, 10... Photosensitive drum, 12...・Developer, 19・
...Registration roller pair, 30...Quick disk 8
iw, 71... mainp [] seri group, 130.13
4...first and second optical detectors, 131.135...
・Light-emitting element, 132.136... Light receiving element, 142・
...Memory, 140...CCD line sensor, Qd.
・・Quick disc, 173・・Motor, 174・
··head. Applicant's agent Patent attorney Takehiko Suzu

Claims (3)

[Claims] (1) In an image forming apparatus comprising a scanning means for optically scanning a document placed on a document table, and a transfer means for transferring an image corresponding to the document image guided by the scanning means to a transfer material. , a detection means provided near the transfer means for detecting the amount of positional deviation corresponding to the moving direction of the transferred material and the amount of positional deviation corresponding to the direction orthogonal to the moving direction; 1. An image forming apparatus comprising: storage means for storing the amount of positional deviation in a removable storage medium. (2) The image forming apparatus according to claim 1, wherein the detection means comprises a light receiving element. (3) The image forming apparatus according to claim 1, wherein the storage medium is a rotatable quick disk.