JPH04114142A - Form positioning device - Google Patents

Abstract

PURPOSE:To enable good-precision positioning by narrowing down the comparison range of the detected value of one positioning mark when the detected value of the other positioning mark is within a specific range. CONSTITUTION:The output voltage value VX1 of a front sensor 121a corresponding to the mark is within in the range between a 1st reference voltage V1 and a 2nd reference voltage V2 and 1st judging means 131a and 132a judge that the voltage value is within the range. A switching means 133 sets an output voltage value VX1 corresponding to the mark 121a as a new reference voltage value according to said judgement result, so the range H2 of the new reference voltage value becomes narrow. In this state, if an output voltage value detected by a rear sensor 121b is VX2, 2nd judging means 131b and 132b judges whether or not this output voltage value VX2 is between the 1st reference voltage value V1 and new reference voltage value VX1. Consequently, the output voltage value of the sensor is judged by using the narrow range to improve the detection accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper alignment device, and particularly to a color separation document used in an image recording device that aligns a color separation document used when creating a color image. This invention relates to improvements in alignment devices.

[Conventional technology]

For example, as a color image recording device, red (R), green (G), and blue (B) color separation mask originals (hereinafter referred to as originals) are created from a color original image, and these are sequentially stacked on the same side of a photosensitive recording medium. An image recording apparatus is known in which an exposure means performs color separation exposure using color light corresponding to each original plate, and records an image by forming a latent color image on a photosensitive recording medium ( For example, Japanese Patent Application No. 62-105843 filed by the applicant of the present invention).

In such a color image recording apparatus, it is necessary to align a plurality of original plates on the same photosensitive recording medium with high precision, so as shown in FIG. 7, alignment marks M1M2 are placed on the original plate MG. is printed, and the marks M, M are detected by a plurality of optical sensors (not shown) arranged at predetermined positions. And if, original version MG power)
If it does not come to the predetermined position, move the alignment device one turn forward, backward, left and right, and adjust it one turn so that it is placed at the predetermined position.
(For example, the applicant's patent application No. 62-25600
No. 0).

[Problem to be solved by the invention]

However, in the conventional alignment device,
As shown in the figure, marks M1 and M21 have alignment pass ranges G, G, . Therefore, the first optical sensor detects the pass range at the position of code A (position within mark M2, that is, a normal pass), and the second optical sensor detects the pass range at the position of code B (position outside mark M). Even when a passing range was detected, it was determined that the position was "passed".As a result, an image with shifted colors was output. As a simple means to eliminate the inconvenience of applying force, for example, (f, alignment passing range G, width W1 of SG2)
, W2 can be made narrower, but if the width is made narrower, there is a problem that alignment takes time and the hard copy output speed becomes slower.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a paper alignment device that can improve alignment accuracy without slowing down the alignment speed and, for example, can obtain hard copies without color misregistration.

[Means to solve the problem]

In order to achieve this object, the paper alignment device of the present invention provides a sensor corresponding to the alignment mark written on the paper, and moves the paper so that the output value thereof is within a predetermined output value range. In the sheet alignment device, a reference voltage generating means for generating a first reference voltage and a second reference voltage, and a reference voltage generating means for generating a first reference voltage and a second reference voltage, and a reference voltage generating means for generating a first reference voltage and a second reference voltage, and a reference voltage generating means for generating a first reference voltage and a second reference voltage, and a reference voltage generating means for generating a first reference voltage and a second reference voltage, and a reference voltage generating means for generating a first reference voltage and a second reference voltage, and a reference voltage generating means for generating a first reference voltage and a second reference voltage; Equipped with multiple sensors that generate output voltages depending on the state,
The paper alignment device includes a first determination unit that determines whether an output voltage value of the sensor corresponding to one alignment mark exists between the first reference voltage and the second reference voltage. , after moving the paper so that the output voltage value of the sensor corresponding to the - alignment marks exists between the first reference voltage and the second reference voltage, a first switching means for switching an output voltage value of a sensor corresponding to a new reference voltage to a new reference voltage; a new reference voltage outputted from the first switching means; and either the first reference value or the second reference value. In between, a second judgment means judges whether or not there is an output voltage value of the sensor corresponding to the remaining seven alignment marks, and the reference voltage is sequentially switched in this way, and the switched reference voltage is It has a set of determining means and switching means for moving the paper so that the detected output voltage of the sensor exists between the voltages, and at least the first determining means and the first determining means are provided.
It includes a switching means and a second determining means.

[Effect]

FIGS. 2(A) and 2(B) show diagrams of the operating principle of the present invention.

In the figure, symbols ■ and ■2 are reference voltage values set by the reference voltage generation means, and ■ or the first reference voltage value,
V2 is the second reference voltage value, and symbol H is the width of the reference voltage value.

The symbol ■X1 is the output voltage value of the sensor corresponding to the previous mark. Now, as shown in the figure (A), the output voltage value ■X
l is within the range of the first reference voltage value ■l and the second reference voltage value V, and it is determined by the first determining means that l is within this range.

Based on the judgment result of the first judgment means, the switching means sets the output voltage value X1 corresponding to the previous mark as the desired reference voltage value, as shown in FIG.

That is, the range of the new reference voltage value is as shown by the symbol H2.
It gets narrower.

In this state, it is assumed that the output voltage value detected by the later sensor is vX2. Then, the second determining means determines whether this output voltage value Vx2 is between the first reference voltage value vI and the new reference voltage value VXI.

Therefore, the output voltage value from the sensor can be determined within a narrower range, improving detection accuracy.

〔Example〕

Hereinafter, a first embodiment and a second embodiment embodying the present invention will be described with reference to FIGS. 1 to 6.

First, a color image recording apparatus C to which the present invention is applied will be explained based on FIG. Figure 3 shows a monochrome laser printer (hereinafter referred to as printer) 1 and an image recording bag a (hereinafter referred to as printer).
It is called a recording device. ) 20 in a combined arrangement. The color image recording apparatus C is common to the first embodiment and the second embodiment except for the "control section".

The printer 1 is loaded on top of the recording device 20, and inside the printer 1, an electrostatic latent image is formed using a laser beam, and the toner image is transferred onto plain paper or OHP paper through a predetermined process, and then fixed and hardened. Output as a copy.

Output paper from the printer 1 is sent to a monochrome paper ejection tray 11 or a paper ejection tray 7 connected to an automatic document feeder (hereinafter referred to as ADF) 14 if a "monochrome image" is required. Furthermore, if a "color image" is required, the image is sent to the paper discharge tray 7, then to the ADF (ADF) ray 12, and then taken into the recording device 20.

The paper sent to the ADF tray 12 is taken into the recording device 20 one by one by the ADF paper feed roller 13, and the monochrome printed paper 3 is output from the printer 1.
Mask original plates (hereinafter referred to as original plates) 15 (red, green, and blue original plates are individually 15R,
15G.

It is written as 15B. ) is used as.

The original plate 15R is an original plate in which toner, which is a light-shielding image, is placed on other parts of the microcapsules coated on the photosensitive recording medium 50 in order to harden the microcapsules having a cyan dye precursor. Similarly, the original version 15G is
In order to harden the microcapsules having a magenta dye precursor, and the original plate 15B has a toner as a light-shielding image on other parts, the microcapsules have a yellow dye precursor.

Next, the configuration of the recording bag 5 [20] will be explained.

An alignment device 31 that performs exposure is arranged at the bottom of the main body of the recording device 20, and the ADF tray 12 and the alignment device 31 are connected by an original transport path 21. On both the left and right sides of the alignment device 31, there are roller pairs 22, 23, 24, 25, 26, 27 and a gate 28.2 whose rotation direction can be controlled.
9 and an original storage unit 102 are provided. roller vs 2
An original discharge tray 30 for discharging used originals 15 is provided outside 6.27.

As shown in FIG. 4, the alignment device 31 includes a pair of rollers 32.3 for moving the original 15 in the transport direction (direction of arrow G).
3 is attached, and the roller pair 32, 33 is connected to the drive motor 11.
1 through multiple gears and shafts. The roller pairs 32 and 33 are attached to the device main body frame 112,
It is rotatably attached to an alignment frame 113 that is attached movably within the attached plane.

The alignment frame 113 is the frame 112 of the device main body.
against link 114 and lateral movement link 115.11
The position is regulated by 6. Lateral movement link 11
5.116 are configured to move in the directions of arrows H and I, respectively, by the driving force of lateral movement motors 17 and 118 and gears. A glass plate 34 is attached to the center of the alignment frame 113, and allows the guide of the original 15 between the pair of rollers 32, 33 and the exposure light from below to pass therethrough. Further, near the roller pair 32,
The sensor mounting member (not shown) is the frame 1 of the device main body.
12, and the sensor mounting member has an alignment mark MSM2 printed on the non-image area 15a of the original 15 in order to align the original 15 at a predetermined position.
Positioning sensor 21 a at a position approximately corresponding to
%121b and 121c are attached. Sensors for positioning 21 a, 12 l b, 121
All of c are reflective optical sensors using a combination of an LED and a photodiode, for example.

An exposure device 41 that is movable left and right along the alignment device 31 is arranged on the lower right side of the alignment device 31 . The exposure device 41 is a linear white light source (hereinafter referred to as a lamp).
42, a reflecting plate 43 that reflects light from the lamp 42, and a filter unit 44 including a red filter 44R, a green filter 44G, and a blue filter 44B. Below the alignment device 31, a control unit 130 (first
Example) and 130A (second example) are provided.

The photosensitive recording medium 50 is, for example, disclosed in Japanese Patent Application Laid-Open No. 62-14304.
The main material is a photocurable resin using a photopolymerization initiator known in Publication No. 4, and the photocurable resin cures when exposed to light of each wavelength of red, green, and blue, and each of cyan, magenta, and yellow. The cartridge 5 is constructed by coating microcapsules containing a dye precursor on a base sheet.
It is stored in 1. The photosensitive recording medium 50 is routed from inside the cartridge 51, passing between the glass plate 34 and the exposure table 52, passing through a buffer 55, a separating roller 64, a pressure developing device 70, and a driving roller 57, to the take-up roller 54. . The exposure table 52 is lowered by a cam 53 and brings the original 15 conveyed onto the glass plate 34 and the photosensitive recording medium 50 into close contact.

The fixed roller 56 is pressed against the left end of the exposure table 52 when the exposure table 52 is lowered to a predetermined position, and is arranged so as to fix the photosensitive recording medium 50 to the exposure table 52 during exposure of the original plate 15.

The color developer sheet 60 is constructed by coating a color developer disclosed in JP-A No. 58-88739 on a base paper, for example.
It is set in the cassette 61 with the developer coated side facing downward.

The pressure developing device 70 superposes the photosensitive recording medium 50 on which a latent image has been formed by exposure and the color developer sheet 60, and performs pressure development.

The heat fixing device 80 heats the color developer sheet 60 using a heater.

(1) First Embodiment (a) Structure A control system for aligning the original in the first embodiment will be explained with reference to FIG. Note that this control system is used only for the purpose of aligning the original, and a control system for controlling the main body of the apparatus is provided separately.

As shown in FIG. 1, the control system includes a control section 130 indicated by a dashed line, and other sensors, motors, and the like. Inside the control unit 130, there is an electronic control circuit 9 indicated by a chain double-dashed line.
0 is provided.

The electronic control circuit 90 includes a CPU 91 that executes arithmetic processing for various controls, a ROM 92 in which control programs and initial data necessary for the CPU 91 to execute the arithmetic processing are recorded in advance, and a ROM 92 that executes the arithmetic processing in the CPU 91. A RAM 93 in which data used for the process is temporarily stored;
It includes an input circuit 94 that inputs an input signal, an output circuit 95 that outputs an output signal, and the like.

The sensors 121 a, 12 l b, 121 c are
Comparators 131a, 13lb, 1, respectively
31c, and is also connected to one input end of comparators 132a, 132b, and 132c. Combare 9131 a.

At the other input terminals of 131b and 131c, there is a reference voltage generating circuit 1 that generates a first reference voltage V2 and a second reference voltage V2.
One output terminal (first reference voltage 1) of 20 is connected. The other output terminal (second reference voltage 2) of the reference signal generation circuit 120 is connected to the other input terminals of the comparators 132a and 132c, and the switching switch 13
It is connected to one input end of 3. The other input end of the changeover switch 133 is connected to the sensor 21a, and the output end of the changeover switch 133 is connected to the comparator 1.
32b.

The respective output terminals of the comparators 131b and 132b are connected to the respective input terminals of the two-person exclusive OR circuit 134b.

Output terminals of the comparators 131a and 132a are connected to respective input terminals of a two-person exclusive OR circuit 134a.

The respective output ends of the comparators 131c and 132c are connected to the respective input ends of the two-person exclusive OR circuit 134C.

The output terminals of the exclude OR circuits 134b and 134c are connected to the input circuit 94. The output terminal of the exclusive OR circuit 134a is connected to the input circuit 94 and to the switching control terminal of the changeover switch 133.

The output circuit 95 is connected to a drive circuit 99 that drives the drive motor 11 and the lateral movement motors 17 and 118, respectively.

(b) Operation Next, the operation of the first embodiment will be explained with reference to FIG. Note that the general operation of the color image recording apparatus will be explained later.

Alignment mark M 1M2 for original plate 15 (see Figure 4)
The sensor 21a, 12lb.

Detection signals indicating whether or not 121c has detected are sent to comparators 131a, 13lb, and 131c, respectively.
is input.

Now, as shown in FIG. 2(A), if the output voltage value vXl of the sensor 21a is smaller than the first reference voltage value v1 and larger than the second reference voltage value 2, the comparator 131a is at L level. Output. Moreover, the comparator 132a outputs H level. Therefore, exclude
Since the Shibu-OR circuit 134a outputs the H level, the selector switch 133 is switched to the dotted line side, and after switching, the other reference voltage value of the comparator 132b is
(See Figure 2 (B)). That is, the new reference voltage values are the first reference voltage values ■1 and ■X1, and the range is marked H.
narrowed down to 2.

Next, it is assumed that the mark M2 is read by the sensor 21b and its output value is VK2. Since vx2 is smaller than the first reference value ■ and larger than the new reference value x1, the comparator 131b outputs an L level, and the comparator 132b outputs an H level. Therefore, exclusive OR circuit 134b outputs H level and inputs it to input circuit 94. With this input, the CPU 91
Generates a signal to proceed to the next process (eg, exposure process).

Furthermore, when vx2 is above range H2, comparators 131b and 132b both output H level, and exclusive OR circuit 134b outputs L level. The CPU 91 receives this L level signal and outputs a predetermined signal to the output circuit 95 and the drive circuit 99.
is applied to various motors 111, 117, and 118 via. Then, these motors are driven as appropriate, and the alignment frame 113 (see FIG. 4) is also driven to align the original 15. After performing such alignment, the same operation as described above is performed again, and the output value of the sensor 21b is within the range H.
Repeat until reaching 2.

In addition, as shown in Figure 2 (C), the new standard is indicated by the symbol ■
may be set to the second reference voltage value v2, and the range I may be set to H3.

In addition, the sensor 21C detects a shift in the direction perpendicular to the arrow G in FIG. 4 (that is, the vertical direction of the original 15 in the figure), and the detected value of the sensor 21C is
Only when it is larger than V2, the exclusive OR circuit 134C outputs an H level and notifies the input circuit 94, so the CPU 91 drives, for example, the motors 17 and 118 to move the original 15.

Second Embodiment In this embodiment, reference values are switched using software. Note that the same parts as those explained in FIG. 1 are given the same reference numerals and their descriptions are omitted.

(a) Configuration As shown in FIG. 5, the input circuit 94 includes each sensor 12.
An A/D converter 98a that converts the detection signals from 1a, 12lb, and 121c into digital signals.
, 98b and 98c are connected. Software for switching the reference value is stored in the ROM 92.

(b) Operation Next, the operation will be explained with reference to FIG.

When the original 15 is transported to the alignment device 31 (step S1), the reference signal with which the detection signal of the sensor 121b is compared is set to the first reference (step S2). The alignment mark M1 printed on the original plate 15 is the sensor 121a.
The detection signal of the sensor 21a is detected by the A/D
The signal is converted into a digital signal by the converter 98a, and is input to the CPU 91 by the input circuit 94. sensor 2
If the detection signal 1a is not within the range of the first reference (step S3: NO), each alignment mark M printed on the original plate 15 is detected by the sensor 21a.
, 121b, 121cl: are detected, each detection signal is converted into a digital signal by each A/D converter 98a, 98b, 98c, and the original 15 is moved based on the detected result (step S4). Then, the detection signal of the sensor 21a is repeatedly detected, and the above-described operation is performed (step S3).

When the detection signal of the sensor 21a becomes a predetermined detection signal (step S3; YES), the reference signal with which the detection signal of the sensor 21b is compared is set to a second reference narrower than the first reference value. (Step S5). If the detection signal detected by each sensor 21a, 121b, 121c does not become the second reference (step S6
; NO), each sensor 121 a, 12 l b,
Original version 15 based on the results detected by 121 c.
is moved (step S7). Each sensor 121a.

The detection signals detected by 121b and 121c are
If it becomes the reference (step s6; YES), the alignment is finished and the next step, exposure processing, is performed.

■General operation Next, in the image recording device configured as above,
The operation of obtaining a plurality of color images from an IM original will be explained.

An original plate 15R for red is created by the printer 1, and after being sent to the ADF tray 12, the original plate 15R is fed into the recording device 2o by the ADF paper feed roller 13. The original 15R fed into the recording device 20 passes through the original transport path 21 and is sent to the alignment device 31 by the roller pair 24, 22.

At this time, the gate 28 is at the position indicated by the solid line.

The alignment device 31 transports the original 15R by a pair of rollers 32 to the appropriate exposure position on the glass plate 34, and then aligns the original 15R with the original 15R.
While reading the alignment mark printed on the sensor 5R, the drive motor 111, the lateral movement motor 117 .
By driving 118, the original 15R is moved to a predetermined position.

Immediately before positioning, the exposure table 52 moves the cam 5 to a predetermined position.
3, the fixed roller 56 is lowered to the left end of the exposure table 52.
is pressed to fix the photosensitive recording medium 50 to the exposure table 52. After the alignment is completed, the exposure table 52 is further lowered by the cam 53, contacts the glass plate 34 of the alignment device 31, and brings the original 15R and the photosensitive recording medium 50 into close contact.

When the exposure table 52 comes into close contact with the alignment device 31, the lamp 42
is turned on, and the exposure device 41 performs scanning exposure in the direction of arrow A in order to expose the photosensitive recording medium 50 with red light via the red filter 44R and the original plate 15R. When the exposure is completed, the lamp 42 turns off and the exposure device 41 moves in the direction of arrow B.
Move back in the direction of. At this time, the filter unit 44 of the exposure device 41 is moved by a drive source (not shown), and the green filter 44G is positioned above the lamp 42.

During the return movement of the exposure device 41, the exposure table 52 is raised by the rotation of the cam 53, and the photosensitive recording medium 50 is moved up by the alignment device 31.
and separated from the original plate 15R.

Even after the exposure of the original plate 15R for red is completed, the exposure table 52 only rises to a predetermined position, and the photosensitive recording medium 50 is fixed to the exposure table 52 by a fixed roller 56 pressed against the left end of the exposure table 52. It remains in its original state.

Next, green original plate 1 created by printer 1
When 5G passes through the ADF tray 12, ADF paper feed roller 13, and original transport path 21 and comes just before the roller pair 24, the roller pairs 22, 24, 25, 27, and the alignment device 31
The pair of rollers 32 and 33 are rotated in a direction to convey the original 15R to the right, and at the same time the original 15R is sent out from the alignment device 31, the original 15G is conveyed to the exposure position and stopped. At this time, the gates 28 and 29 are in the solid line position, and the exposed original plate 15R is sandwiched between the roller pair 27 and the rear end thereof has passed through the roller pair 27.
It is held by stopping the rotation at step 7.

The original 15G guided to the alignment device 31 is the original 15
As in the case of R, after alignment with the photosensitive recording medium 50, the exposure table 52 is lowered to come into close contact with the photosensitive recording medium 50. Thereafter, the lamp 42 is turned on and exposure to green light is performed via the green filter 44G. After the exposure is completed, the exposure table 52 is raised to a predetermined position. The exposure device 41 is moved back to the original position, and the blue filter 44 is
Can be switched to B.

Next, the blue original plate 1 created by the printer 1
5B is similarly fed to the recording device 20 and transported just before the roller pair 24, and the roller pairs 24, 22, 25, .
26 and roller pairs 32 and 33 of the alignment device 31 are rotated in a direction to convey the original 15G to the right, and the original 1
5G is sent out from the alignment device 31 and the original plate 15B
is transported to the exposure position and stopped. At this time, Kate 28
is at the solid line position, and the cage 29 is at the broken line position.The exposed original plate 15G is held between the roller pair 26 and with its rear end passing through the gate 29, when the roller pair 26 stops rotating.

The original 15B guided by the alignment device 31 is brought into close contact with the photosensitive recording medium 50 by a similar operation. Photosensitive recording medium 50
is exposed to blue light through the original plate 15B.

By the above operations, a latent image of a desired color image is recorded on the photosensitive recording medium 50.

Next, the exposure table 52 is raised to the initial position, the fixed roller 56 and the left end of the exposure table 52 are separated from each other, and the buffer 55 is moved in the direction of the arrow E to remove the unexposed portions of the photosensitive recording medium 50. is pulled out from inside the cartridge 51 below the exposure table 52. Drive roller 57
The photosensitive recording medium 50 is conveyed and stopped when the leading edge of the latent image reaches the pressure roller of the pressure developing device 70.

In synchronization with the movement of the photosensitive recording medium 50, the developer sheet 60
is taken out from the cassette and conveyed to a position where the leading edge of the developer sheet 60 corresponds to the leading edge of the latent image on the photosensitive recording medium 50, and then stopped.

Next, the pressure developing device 70 is driven by a drive device (not shown).
The pressure roller is pressed while rotating in the direction of the arrow. At this time, by lowering the exposure table 52 to a predetermined position again, the fixed roller 56 is pressed against the left end of the exposure table 52, and the photosensitive recording medium 50 is fixed to the exposure table 52.

The photosensitive recording medium 50 is stacked with the color developer sheet 60 and sent without being pressurized, and the uncured microcapsules on the photosensitive recording medium 50 are destroyed by the pressure, thereby forming the photosensitive recording medium 5.
A color image corresponding to the latent image on the color developer sheet 60 is developed on the color developer sheet 60.

The pressure roller of the pressure developing device 70 is rotated, and the buffer 55 is moved in the direction of arrow F.

The color developer sheet 60 is peeled off from the photosensitive recording medium 50 by a separation roller 64 and guided toward a heat fixing device 80 .

In the heat fixing device 80, the color developer sheet 60 is heated by air to promote color development of the color image. At the same time, the binder polymer (binder resin) for fixing the color developing medium to the base paper of the color developer sheet 60 is thermally melted, and the surface becomes smooth and the surface of the color developer sheet 60 has an appropriate gloss. can get.

The color developer sheet 60 that has been subjected to color development and gloss treatment is discharged to a paper discharge tray 63.

During the above-described series of development and color gloss processing, the photosensitive recording medium 50 is clamped and fixed by the exposure table 52 and the fixed roller 56, so that during the development processing for one screen, the next color image is displayed at the exposed location. The latent image can be exposed to light.

When starting the exposure of the second color image, first, the original 15B at the exposure position is sent to the left, and the roller pair is moved to send the original 15R held at the position of the roller pair 27 to the alignment device 31. 24, 22, 25, 27 and the roller pair 32, 33 of the alignment device 31 are rotated so as to convey the original 15R to the left. At this time, gate 28
．． 29 is at the solid line position. The original 15B is held between the pair of rollers 24, and the rotation of the pair of rollers 24 is stopped at the position where the rear end passes through the gate 28. Alignment device 3
The original plate 15R fed into the photosensitive recording medium 50 is aligned and brought into close contact with the photosensitive recording medium 50. The photosensitive recording medium 50 is the original plate 1
It is exposed to red light through 5R in the same manner as described above.

Next, the original plate 15R at the exposure position is sent out to the left,
In order to send the original 15G held at the position of the roller pair 26 to the alignment device 31, the roller pair 22.23.2
5.26 and the roller pair 32.33 of the alignment device 31 are rotated so as to convey the original 15G to the left. At this time, the gates 28 and 29 are at the dashed line position. The original plate 15R is held between the pair of rollers 23 and is held by stopping the rotation of the pair of rollers 23 at a position past the rear end of the gate 28. Original plate 15 sent to alignment device 31
G is aligned and brought into close contact with the photosensitive recording medium 50. The photosensitive recording medium 50 is exposed to green light via the original plate 15G in the same manner as described above.

Next, the original plate 15G at the exposure position is sent to the right,
A similar operation is performed to feed the original plate 15B held at the position of the roller pair 24 to the alignment device 31, a latent color image is formed on the photosensitive recording medium 50, and a color image is formed on the color developer sheet 60. form.

By repeating similar operations, a predetermined number of color images can be output from one set of original plates 15.

After obtaining the required number of color images from the same original 15, each original 15 is discharged from the roller pair 27 or the roller pair 26 to the paper discharge tray 30.

In addition, if the next original 15 is output from the printer 1 while a series of color images are being exposed, it is stored in the ADF tray 12 and fed into the ADF after the exposure of the previous set is completed. The sheets are fed into the recording device 20 one by one by the roller 13.

Further, when an original printed from another printer or a previously used original is to be used again, the original can be input into the main body of the apparatus by setting it on the ADF tray 12.

In the first and second embodiments, the number of switching stages is one, but if the number of switching stages is multiple, more precise alignment can be achieved.

〔Effect of the invention〕

As is clear from the detailed description above, according to the present invention,
When the detected value of one alignment mark is within a predetermined range, the comparison range of the detected values of the remaining alignment mark is further narrowed, so that highly accurate alignment can be performed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the control system of the first embodiment of the present invention. FIG. 2 (A), (B), and (C) are diagrams explaining the operating principle of the present invention. FIG. 3 is a block diagram showing the control system of the first embodiment of the present invention. 4 is a plan view of the alignment device according to the embodiment of the present invention, FIG. 5 is a block diagram showing the control system of the second embodiment of the present invention, and FIG. 6 is the above-mentioned A follow-up chart showing the operation of the second embodiment, FIG. 7 is a diagram explaining the conventional disadvantages. 15...Mask original (manuscript) 31...Positioning device 120...Reference signal generation circuit (reference signal generation means) 1
21a to 121c...sensor 130.130A...control unit 131a, 132a/comparator (first judgment means) 131b, 132b...comparator (second judgment means) 133...changeover switch (switching means) 134a・
- Exclusive OR circuit (first judgment means) 134b... Exclusive OR circuit (second judgment means)

Claims (1)

[Scope of Claims] A paper alignment device in which a sensor is provided corresponding to the alignment mark written on the paper, and the paper is moved so that the output value thereof is within a predetermined output value range, a reference voltage generating means for generating a first reference voltage and a second reference voltage; and a reference voltage generating means disposed corresponding to a plurality of alignment marks, each generating an output voltage according to a detection state of the alignment mark. and a plurality of sensors, the paper alignment device detects whether an output voltage value of the sensor corresponding to one alignment mark exists between the first reference voltage and the second reference voltage. a first determining means for determining; and after moving the paper such that the output voltage value of the sensor corresponding to the one alignment mark is between the first reference voltage and the second reference voltage. , a first switching means for switching the output voltage value of the sensor corresponding to the one alignment mark to a new reference voltage, a new reference voltage output from the first switching means, and the first reference value or a second determination means for determining whether or not a sensor output voltage value corresponding to the remaining alignment mark exists between one of the second reference values; and in this way, the reference voltage is sequentially switched; and a pair of determining means and switching means for moving the paper so that the detected output voltage of the sensor is present between the switched reference voltages, at least the first determining means and the first switching means. A paper alignment device comprising: and a second determining means.