JP3441023B2 - Multicolor printing method and multicolor printing apparatus using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multicolor printing method and a multicolor printing apparatus using the same.

[0002]

2. Description of the Related Art One of printing apparatuses is a stencil printing apparatus. This printing apparatus winds a stencil master having holes corresponding to an original image by a punching process corresponding to a plate making process on a plate cylinder having an ink permeable structure, and supplies ink to the plate cylinder. The image is printed by leaching the ink from the mechanism and transferring the ink to the printing paper pressed against the plate cylinder.

By the way, one type of printing is multicolor printing in which a full-color original such as a color photograph or poster is used and an image of a color corresponding to the original is printed. When this printing is performed, high-level technology such as fine adjustment such as color matching is required, and thus it is almost impossible with the above-mentioned stencil printing apparatus.

Recently, by the exchange of the drum, but not full, and text so overprinting of multicolor capable stencil printing machine is proposed, that the multi-color printing with 2-5 colors is performed It is becoming possible.

In particular, among the multicolor printing, it is easy to print a mixture of two color images on one printing sheet.
It is said to be used frequently.

As an example of performing the above-mentioned two-color printing, there is a method in which a drum is replaced and a print image of each color is printed. To explain this case is as follows. The document reading unit is provided with a configuration in which a color CCD or a monochrome CCD and a color filter are combined, and color separation is performed for each color when reading the document, and the image information is stored in the control unit. Plate-making process for manufacturing work stencil master for using the color based on the color image information stored in the control unit is performed to apply a stencil master in terms of the MekuSo plate making has been stencil master plate cylinder Printing is performed with color inks. Next, after waiting for the first printed image to dry, the image information of the color separated by color separation is stored in the control unit. The plate making process of the image master is executed in the same manner as when printing the color according to the image information stored in the control unit, and the stencil master made is different from the plate cylinder wound with the stencil master of the first color. After being wrapped around the plate cylinder,
By supplying ink, the next color is printed on the same printing paper.

[0007]

However, the above multicolor printing method has the following problems.

As the first problem, since it is necessary to prepare a plate cylinder for each color to be printed, the number of parts must be increased and the maintenance must be maintained. The reason for using such a plurality of plate cylinders is that if different color inks are used in the same plate cylinder, color mixing easily occurs. This is because it becomes necessary and avoids forcing the user to perform a troublesome operation.
The second problem is that when printing is performed for each color,
Possibility that printing time required for color printing will be lengthening Ru is Ah <br/>. The lengthening of the printing time is also increased by the need to dry the printed image after the first printing is completed. As the third problem, the work of exchanging the plate cylinder is required in connection with the first problem, and the workability of printing is poor. Since it is necessary to replace the plate cylinder according to the number of colors to be printed, the replacement work becomes more troublesome as the number of colors increases, and the working time also increases. The fourth problem is that when printing the next color after the plate cylinder is replaced,
The consistency of the print position with the previously printed image tends to deteriorate, and alignment as a process for this is required. The more the number of colors to be printed, the more the alignment is performed by the work of trial printing, and therefore the workability of the printing work will be deteriorated even from now on. A fifth problem is that when the plate cylinder is exchanged multiple times, the operator's hands and clothes are easily soiled by the ink adhering to the plate cylinder surface when the plate cylinder is attached and detached.

In view of the above-mentioned problems in the conventional multicolor printing method, an object of the present invention is to reduce the number of parts and cost in managing the parts, and to improve the workability . It is to provide a multicolor printing apparatus using the same.

[0010]

In order to achieve this object, the invention according to claim 1 is a master reading step of color-separating a multi-color original and registering image information for each color, and a master. On the other hand, a plate making process for making a plate according to image information,
And MekuSo the master plate cylinder surface, in multicolor printing method comprising a printing step of performing printing on the printing sheet by transfer of ink from the master, multicolor indicia based on the multicolor original
When printing is performed , a first image is formed by forming an image pattern corresponding to the image information of the first color among the image information for each color separated as described above by an ink jet to form an image pattern. The master process is performed according to the forming process and the image information of the second color of the image information for each color that has been color-separated .
Formed by supplying ink to perforation of the stencil master by MekuSo stencil master which is plate-making by the plate process plate cylinder surface
The possible second image forming step to the second image forming step
Stencil master used and run continuously as target, first, the stencil image obtained by the second image forming process
It is characterized by having a transfer step of transferring from the master to the printing paper.

[0011] The invention of claim 2, wherein, in addition to the first aspect of the invention, by the first and second image forming process
The image obtained is a stencil used in the second image forming step.
Formed on the surface of the master that contacts the printing paper
It is characterized in.

The invention according to claim 3 is the invention according to claim 1 or 2.
A multi- color printing apparatus using the multi- color printing method described, which is rotatable and has a single plate cylinder having a large number of perforations formed on the surface thereof, and a first image forming step, An ink jet device having a nozzle facing the master wound on the surface of the plate cylinder, and contacting the master surface for performing the plate making step in the second image forming step.
And a thermal head for punching a position corresponding to the image information of the second color, and a position facing the image transfer position in the plate cylinder for performing the second image forming step, An ink supply mechanism that supplies ink corresponding to the second color, and the transfer step,
A press roller that can be placed in contact with and separated from the ink supply mechanism across the plate cylinder, and the transfer process is performed, so that printing paper can be fed toward the image transfer position on the plate cylinder. and Do sheet feeding apparatus, with the ink jet device and the thermal head is connected to the output side, by inputting the image information, the colors
And a controller that controls the drive of the inkjet device and the thermal head according to the image information of the image.

According to a fourth aspect of the present invention, in the multicolor printing apparatus according to the third aspect, the master has a thermoplastic resin on at least a side facing the thermal head, and the master has a surface on which the ink is applied. It is characterized by a laminated structure having a permeation part that can permeate.

[0014]

[Action] In the present invention of claim 1 Symbol placement, multi based multicolor original
When performing color printing, the first image type capable of forming a master image of the first color as an image pattern by the flight of the ink
The process of forming and the image of the second color are processed by the master plate making process.
Second image formation that can be formed using a master that has been reprinted
And a stencil master used in the second image forming step.
For the first and second image forming process.
Transfer the image obtained from the above from the above master to printing paper
Since it has a transfer process for
This makes it unnecessary to replace the plate cylinder. Moreover, the same
The image pattern and the first image formed by the first image forming process on the master
The print image is continuously formed by the second image forming process, and the second image is formed.
The image obtained in the first image forming step during the image forming step is also
Can be transcribed. In the invention described in claim 2, the first and second
The image obtained by the image forming process of
Contact with printing paper in commonly used stencil masters
Since it is formed on the surface, the printing paper can be
The image can be transferred just by performing the first and second image formation.
The images obtained in the process and can be continuously transferred to printing paper.
It

According to the third aspect of the invention, the image formed by the ink jet and the image formed by the stencil printing are transferred from one master to the printing paper.

According to the fourth aspect of the present invention, the ink can be leached during the stencil printing, and the ink ejected to the surface of the master by the ink jet device is printed without being permeated into the master. Transferred to paper.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 1 is a schematic diagram for explaining the overall structure of a multicolor printing apparatus for two colors out of the multicolor printing apparatus used in the embodiment of the present invention. The schematic configuration and operation of the multicolor printing apparatus will be described below with reference to FIGS. 1 and 2.

In FIG. 1, the multicolor printing apparatus 1 is provided with a plate cylinder 2 which can be rotated in the forward and reverse directions about a rotary shaft 2A.
A large number of perforations are formed on the peripheral surface of the plate cylinder 2 except for a part thereof, and a thin layer mesh screen (not shown) made of, for example, synthetic fiber is attached to the surface thereof. It is also possible to use a metal as the material of this mesh screen. Although not shown, a stage made of a magnetic material having a mounting surface along one generatrix of the plate cylinder 2 is swingably supported at a position where no perforation is formed on the peripheral surface of the plate cylinder 2. A clamper including a holding member that can be brought into and out of contact with the stage is provided. The stage can mount the tip of the stencil master 11, and the stencil master 11 having the tip mounted on the stage is sandwiched and fixed by a gripping member. Areas other than the tip of the stencil master 11 are adapted to adhere to the surface of the plate cylinder by the adhesive force of ink supplied from the ink supply mechanism 3 described later toward the surface of the plate cylinder 2.

An ink supply mechanism 3 is provided inside the plate cylinder 2. The ink supply mechanism 3 is arranged directly below the rotary shaft 2A, and includes an ink roller 3A and a doctor roller 3B as main parts. Ink roller 3A
Is below the rotation shaft 2A of the plate cylinder 2, a metal roller arranged at a position opposed to the press roller 4 to be described later, Do contact with the inner circumferential surface of the plate cylinder 2 is al Rotation, doctor roller Three
The ink, the amount of which is supported by B, can be supplied into the perforations of the plate cylinder 2 and the mesh screen. The ink, the amount of which is carried by the doctor roller 3B, is dropped from the ejection port 2A1 formed on the rotary shaft 2A into the ink reservoir 3C as shown in FIG. The ink applied to the ink supply mechanism 3 is black used for monochrome printing. The ink roller 3A is arranged at a position facing a press roller 4 described later, and thus functions as a backup roller that prevents deformation of the plate cylinder 2 when the press roller contacts the plate cylinder 2. ing.

The press roller 4 arranged at a position facing the ink roller 3A is a rotary member provided so as to be able to come into contact with and separate from the plate cylinder 2, and a printing paper S is fed from a paper feeding device 5 described later. As the printing paper S can be pressurized toward the surface of the plate cylinder 2 are disposed at an image transfer position where it is possible to relocation ink leached from the stencil master 11 to the printing paper S when it is fed.

A paper feeding device 5 is provided near the press roller 4. The paper feeding device 5 is provided so as to be able to come in contact with and separate from the uppermost one of the printing papers S stored in the paper feeding tray 5A, and feeds the printing papers S in the feeding direction corresponding to the arrow direction in the drawing. The roller 6 and the separation roller pair 7 and 8 which are arranged so as to face each other across the feeding path of the printing paper S and are rotatable in a direction capable of preventing the double feeding of the fed printing paper S, and the plate. The registration roller 9 is configured to feed the print sheet S by setting the feeding timing of the print sheet S toward the position where the cylinder 2 and the press roller 4 are in contact with each other. In the sheet feeding device 5, the feeding roller 6 comes into contact with the uppermost one of the printing sheets S accommodated in the sheet feeding tray 5A and rotates to feed the printing sheet S, and the separating rollers 7 and 8 feed the printing sheet S to the uppermost position. Only the upper printing paper S is fed toward the registration roller 9. Printing paper S
Is clamped by the registration roller 9, and the press cylinder 4 and the press cylinder 4 are pressed with the timing of aligning the image position of the stencil master 11 and the print start position on the printing paper S with reference to the timing of contact of the press roller 4 with the plate cylinder 2. The sheet is fed toward the contact position with the roller 4.

In FIG. 1, a plate making section 10 is arranged above one side of a vertical line passing through the center of the plate cylinder 2. The plate making unit 10 has a stencil master 11. As shown in FIG. 3, the stencil master 11 is a Japanese paper or a synthetic fiber, which is a porous support 11C capable of penetrating ink from the plate cylinder 2 into a thin thermoplastic resin film 11B having a thickness of about 1 to 2 μm, or A laminate structure in which a mixture of these materials is pasted is used, and the thermoplastic resin film 11B is wound around the plate cylinder 2 while being positioned on the outer surface.

Such a stencil master 11 has a core material 11A.
It can be rolled up and rolled out in sequence. In FIG. 1, the stencil master 11 fed from the roll is pressed against the thermal head 12 by a platen roller 13, and the heating elements of the thermal head 12 are selectively heated to scan in the main scanning direction and the sub-scanning direction. Perforated in the area of direction. Thermal head 12
Is configured to perform perforation by setting a selective heat generation position of the heat generating element in the scanning direction by energization control using a drive signal from a control unit described later.

The platen roller 13 is provided with a stepping motor (not shown) as a drive source, and by performing stepwise rotation, the stencil master 11 can be fed in the sub-scanning direction corresponding to the feeding direction. ing. On the downstream side of the platen roller 13 in the feeding direction of the stencil master 11, a carrying roller 14 capable of sandwiching and carrying the stencil master 11 is arranged. The conveyance roller 14 can be interlocked with the stepping motor via a torque limiter (not shown), and a rotation speed at which a conveyance speed slightly higher than the conveyance speed of the stencil master 11 set by the platen roller 13 is obtained. Has been set. As a result, the stencil master 11 applies a preset tension by the torque limiter in the range from the position where it contacts the thermal head 12 to the position where it is nipped by the transport roller 14 due to the speed difference between the platen roller 13 and the transport roller 14. The platen roller 13 suppresses the occurrence of slack and wrinkles at the position pressed by the thermal head 12. In this case, the main scanning direction corresponds to the axial direction of the platen roller 13, and the sub-scanning direction is a direction perpendicular to the main scanning direction and corresponds to the feeding direction of the stencil master 11. The stencil master 11 that has completed the perforating process is cut into a required length by a cutter 15, is fed in the tangential direction of the plate cylinder 2, and the tip is gripped and fixed by the clamper. As the configuration of the cutter 15, as shown in FIG. 1, a guillotine type having a movable blade capable of moving up and down with respect to a fixed blade located on the transport path of the stencil master 11 and a rotary blade rotatable with respect to the fixed blade A rolling type is used.

An image reading unit 100 is installed above the multicolor printer 1. The image reading unit 100 is
A conveyance roller 102 disposed on both sides of the document scanning unit 101 using contact glass across the document feeding direction in the direction of the arrow, a light source 103 for illuminating a document P passing over the document scanning unit 101, and a document P. Reflected light from the color CC
Mirror 105 and lens 10 introduced toward D104
6 is provided. The original P used in this case is a multicolor original having red and black images. In the document reading section 100, the reflected light from the document P is colored C
Color separation is performed by the CD 104, and image information for each color is output to the control unit 20 described later.

FIG. 2 is a block diagram for explaining the configuration of the control unit 20. In FIG. 2, the control unit 20 uses a main controller 20A having a storage device such as a ROM and a RAM. Main controller 20A
Is an image format via an I / O interface (not shown).
Members related to the production work are connected, and as the members related to the present embodiment, the operation unit 21 and the color CC are provided on the input side.
Original reading data from D104 is A / D converter 2
2, 23 , A / D converted and taken as image information
A CCD image processing unit 24 for inserting a thermal head image processing unit 25, which is a driving unit of the thermal head 12, and an inkjet device 11 described later are connected to the output side.
An inkjet drive unit 110A for driving 0 is connected.

In the control unit 20, the stencil master 11 is executed based on the color-separated image information for each color, which is used when executing a program for sequence-controlling the overall printing process stored in the ROM and executing multicolor printing. The plate making process by the punching process and the image forming process by the drive control of the inkjet device 110 are executed.

In FIG. 1, a position corresponding to the upstream side of the position where the ink supply mechanism 3 is disposed inside the plate cylinder in the downstream side of the plate making section 10 in the clockwise direction of rotation of the plate cylinder 2,
The inkjet device 110 is arranged. The inkjet device 110 is a device used in multicolor printing, and as shown in FIG. 3, the moving direction of the stencil master 11 in the stencil printing using the stencil master 11 wound on the plate cylinder 2 ( In the direction indicated by the arrow), the plate cylinder 2 and the press roller 4
The stencil master 11 before the image transfer position composed of
On the stencil master 11 which has a nozzle at a position opposed to, and is wound on the surface of the plate cylinder 2, ink is ejected in a dot shape at an image forming position corresponding to red image information to form an image pattern. Are formed. The inkjet device 110 is installed at a position where image formation can be performed before image formation by ink supply from the plate cylinder 2, and constitutes a first image forming unit.
Therefore, the ink supply mechanism 3 used for stencil printing capable of image transfer using the stencil master 11 after image formation by the inkjet device 110 constitutes a second image forming means. In the present embodiment, the inkjet device 110 is used for the purpose of performing two-color printing of red and black, and is designed to eject red ink that is a color corresponding to the image information of the first color. There is. Inkjet apparatus 110 having the function as described above, together with blocking the main scanning direction along parallel modulo line of the plate cylinder 2 orientation structure or a multiple-nozzle head of the nozzle head are arranged in parallel with respect to the plate cylinder 2 A configuration in which the blocked nozzle head is moved in the main scanning direction is used.

In FIG. 1, the plate discharge section 3 is located at a position facing the plate making section 10 across a vertical line passing through the center of the plate cylinder 2.
0 is placed. The plate discharge unit 30 is configured by a pair of belts 32 that are wound around one roller 30A that is accessible to the plate cylinder 2 and the other roller 30B that is located on the plate discharge box 31 side. When the body 2 rotates counterclockwise, the rear end of the stencil master 11 is received and transferred to the plate discharge box 31. A compression member 33 that can move up and down is provided on the upper part of the plate discharge box 31 so as to compress the stencil master 11 stored in the plate discharge box 31 and prepare a storage space for the stencil master 11 to be discarded next. Has become. Plate ejection box 3
When the inside of 1 is filled with the stencil master 11, the used stencil master 11 housed by taking out the plate discharge box 31 to the outside of the multicolor printing apparatus 1 is discarded.

In FIG. 1, reference numeral 40 indicates a peeling claw for peeling the printing paper S from the plate cylinder 2, and reference numeral 41 indicates.
Reference numeral 42 denotes a discharge tray for the document P, and reference numeral 42 denotes a transport device for transporting the print sheet S toward the discharge tray 43.

In this embodiment, the following procedure is executed by using the multicolor printing apparatus having the above-mentioned configuration. Placed on the operation unit 21
To form a multi-color image and a monochrome image instead of a multi-color image
When and are selected, the
The first image forming unit and the second image forming unit are the control unit 20.
Controlled in. In the case of a monochrome image, the inkjet device 110, which is the first image forming means, is not used and is maintained in an inoperative state .
The above-mentioned inkjet which is the first and second image forming means
Image transfer using device 110 and stencil master 11 is possible
Image forming means used for simple stencil printing.
The operation of the feeding mechanism 3 is controlled. When a print start switch (not shown) provided on the operation unit 21 is turned on, the plate cylinder 2 rotates counterclockwise and the plate discharge process is performed.
It In the plate discharging process, the stencil master 11 wound on the plate cylinder 2 is sandwiched by the belt 32 of the plate discharging unit 30 and is transferred from the plate cylinder 2 toward the plate discharging box 31 to be removed.

In the plate making section 10, heat generation control of the heat generating elements of the thermal head 12 is performed via the control section 20 in accordance with image information from the document reading section 100, and punching processing is executed in accordance with the document image. Thereby, as shown in FIG. 3, perforations 11D are formed in the stencil master 11, and the stencil master 11 is subjected to plate making. Plate-making master 11
Is clamped at its tip by a clamper located on the plate cylinder 2 and wound around the peripheral surface of the plate cylinder 2. As the stencil master 11 reaches the position of the ink supply mechanism 3, the printing paper S is fed from the paper feeding device 5, and the image transfer timing is set by the registration roller 9 and then the printing paper S is moved to a position facing the ink supply mechanism 3. It is fed and pressed by the press roller 4 toward the surface of the plate cylinder 2. As a result, the plate cylinder 2
Ink that has passed through the mesh screen of Stencil Master 1
Printing is performed by passing through the first perforation 11D and transferring to the surface of the printing paper S.

In the case where the original is a multicolor original of two colors, when the operation section 21 issues a command to print an image of a color corresponding to the original, the following procedure is executed. First, in the document reading unit 100, the reflected light from the document is transferred to the color CCD 10.
A document reading process is performed in which the color separation is performed by the image processing unit 4, and the color information is input to the control unit 20 as image information for each color via the CCD image processing unit 24. The control unit 20 controls the punching process by the thermal head 12 in the plate making unit 10 and the image forming process by the inkjet device 110 according to the image information for each color. The image information of the first color input to the control unit 20 in the document reading process is used in the first image forming process by the inkjet device 110,
The image information of the second color is used in the second image forming process by stencil printing performed by the stencil master 11 punched in the plate making process performed by the plate making unit 10. Therefore, the control unit 20 drives the inkjet device 110 via the drive unit 110A based on the input image information of the first color so that the ink is ejected to the image forming position corresponding to the image information. To do. As a result, ink is ejected from the nozzles of the inkjet device 110, as indicated by reference numeral J in FIG. 3, and adheres to the surface of the thermoplastic resin film 11B of the stencil master 11 to form a dot-shaped image pattern J1. Further, the control unit 20 is configured to execute a punching process for the stencil master 11 in the plate making unit 10 according to the image information based on the input image information of the second color.

The stencil master 11 perforated by the plate making section 10 is wound around the plate cylinder 2 and moved in accordance with the rotation of the plate cylinder 2, as in the case of monochrome printing. Stencil master 11
In the process of moving, the inkjet device 110
When the ink jets from the ink jet device 110, the image pattern J1 (the portion shown by the curved shape in FIG. 3) corresponding to the image information of the first color is formed. The image forming process is performed. Since the image formed in the first image forming step is formed by the ink adhering to the surface of the thermoplastic resin film 11B in the stencil master 11,
The stencil master 11 is dried in a state where image disturbance due to ink permeation is prevented. The stencil master 11 that has undergone the first image forming step reaches an image transfer position facing the press roller 4 as the plate cylinder 2 rotates. By the time the stencil master 11 reaches the image transfer position, the printing paper S is fed from the paper feeding device 5 to the image transfer position via the registration rollers 9, and the fed printing paper S is pressed by the press roller 4. The surface of 11 is pressurized.

As a result, the ink supplied from the ink supply mechanism 3 in the plate cylinder 2 is leached from the plate cylinder 2 and the perforations 11D of the stencil master 11 into the printing paper S, whereby the second color of the second color is obtained. Image D2 corresponding to the image information (in FIG. 3,
The second image forming step in which a portion indicated by a rectangle is printed is performed, and an image corresponding to the image information of the first color formed in the first image forming step and the image forming step are continuously formed. As shown in FIG. 3 , the image corresponding to the image information of the second color formed in the second image forming step to be performed is
On the same side of the star 11, in other words, on the printing paper S
It is continuously transferred in the state of being formed on the contact surface .

The printing paper S on which the images formed in the first and second image forming steps are transferred is conveyed by the conveying device 42 and discharged to the paper discharge tray 43.

Such an image forming process is repeated as many times as the number of sheets required.

According to the present embodiment, the inks of a plurality of colors can be continuously supplied during one rotation of the plate cylinder 2, so that it is possible to carry out the work of re-feeding the printing paper S for each color. It becomes unnecessary.

In the above embodiment, the case where two color original images are individually formed has been described, but the first and second image forming steps are carried out at the same image forming position of the stencil master 11. By doing so, it becomes possible to polymerize each color. Further, the inkjet device 110 can be increased not only in the number corresponding to the image information of the first color but also in accordance with the number of colors of the original image.

[0041]

According to the first aspect of the invention, the ink adhered by the ink jetting performed on the master according to the image information of the first color in the image formation on the printing paper via the master. And the image corresponding to the image information of the second color is formed by stencil printing. In particular, since the multi-color image is formed in the first image forming step prior to the second image forming step in which the stencil printing is performed, the second image that can be formed by using one master is used.
By continuously performing the image forming process of 1) on one stencil master, images of different colors can be formed. This makes it possible to reduce the number of parts required for plate cylinder replacement work and multicolor printing. Moreover, since it is not necessary to replace the plate cylinder, it is possible to prevent the operator's hands and clothes from being soiled. Further, according to the invention described in claim 2, it is obtained by the first and second image forming steps.
Image to be used in the second image forming step
Is formed on the surface that comes in contact with the printing paper, so transfer
In the process, you can print images continuously by simply facing them.
It will be possible to copy images, drying processing of images for each color and image
Improve workability by eliminating the need for technician alignment
It becomes possible.

According to the third aspect of the present invention, the image formed by the ink flight and the image formed by the stencil printing are transferred from one master to the printing paper, which is necessary for multicolor printing. It is possible to reduce the number of plate-making steps performed, which enables shortening of printing time.
Moreover, it is possible to improve the consistency of the image forming position for each color by controlling the inkjet device via the control unit and controlling the heat generation position of the thermal head in the plate making unit.

According to the fourth aspect of the present invention, the ink can be leached out during the stencil printing, and the ink that has been ejected and adhered to the master surface by the ink jet device does not permeate into the master. Since it is transferred to the printing paper with, there is no transfer of ink due to contact like in the printing process.
Ku without image is faint or even when an image is formed on the master in a non-contact state, the degradation of image quality can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a main configuration of a multicolor printing apparatus used in an embodiment of the present invention.

FIG. 2 is a block diagram for explaining a configuration of a control unit of the multicolor printing apparatus shown in FIG.

FIG. 3 is a schematic diagram for explaining a printing state according to an embodiment of the present invention.

[Explanation of symbols]

1 Multicolor printing device 2 plate body 3 Ink supply mechanism 5 Paper feeder 10 Plate making department 11 Stencil master 12 Thermal head 20 Control unit 100 original reading section 104 color CCD 110 inkjet device

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41M 1/12-1/14 B41J 2/01 B41L 13/04

Claims (4)

(57) [Claims] 1. A document reading step of color-separating one multicolor original and registering image information for each color, a plate making step of making a master according to the image information, and a master of the master. and MekuSo the surface, in the multicolor printing method comprising a printing step of performing printing on the printing sheet by transfer of ink from the master, in the case of performing multi-color printing based on the multicolor original is the color among the image information of the decomposed for each color, the image forming corresponding to the first color image information of an image pattern by the flight of the ink
And a stencil master made by the plate making step of the master according to the image information of the second color among the image information for each color separated as described above. Image forming step which can be formed by winding the ink on the surface of the plate cylinder and supplying ink to the perforations of the stencil master.
And a pair of stencil masters used in the second image forming step .
A multicolor printing method comprising a transfer step of continuously executing as an elephant and transferring the images obtained by the first and second image forming steps from the stencil master to a printing paper. 2. The multicolor printing method according to claim 1, wherein an image obtained by the first and second image forming steps.
In the stencil master used in the second image forming process.
A multi-color printing method, wherein the multi-color printing method is formed on a surface that comes into contact with a printing paper . 3. A multicolor printing apparatus using the multicolor printing method according to claim 1, wherein the single plate cylinder is rotatable and has a large number of perforations formed on the surface thereof. In order to carry out the image forming step, the ink jet device having a nozzle facing the master wound on the surface of the plate cylinder, and on the master surface for carrying out the plate making step in the second image forming step. a thermal head for perforating a position corresponding to the second color image information of contacts, in order to implement the second image forming step, are provided in the image transfer position facing the position of the plate in the cylinder hand,
An ink supply mechanism that supplies ink corresponding to the second color, and a press roller that is provided so as to face and face the ink supply mechanism across the plate cylinder so as to come into contact with and separate from the ink supply mechanism so as to perform the transfer process. In order to carry out the transfer step, a paper feeding device capable of feeding the printing paper toward the image transfer position on the plate cylinder, the inkjet device and the thermal head are connected to the output side, and the image information is A multicolor printing apparatus comprising: a control unit that controls the drive of the inkjet apparatus and the thermal head according to the image information of the image for each color . 4. The multicolor printing apparatus according to claim 3, wherein the master has a thermoplastic resin at least on a side facing the thermal head, and an ink penetrating portion capable of penetrating ink on the plate cylinder surface side. A multi-color printing device having a laminated structure having a.