JPH11157197A - Rotary mimeograph printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong the transfer period of ink to paper, and raise a quality of print by setting (n) pieces of print rollers to be in contact with paper concurrently on an image transfer part, in a matter where ink is transferred to paper for forming a signal color image on one surface through once passage of paper in the image transfer part. SOLUTION: A drum 2 includes a number of holes made on its peripheral surface except a part thereof, and a thin layer mesh screen consisting of synthetic resin or the like removably spread over the outside surface thereof. Also, a clamber 2B is provided on a part of the peripheral surface of a printing drum 2 for holding the distal end of a stencil mask, and an ink supply roller 3A is arranged on the inner surface of the printing drum 1. In this instance, two pieces of printing rollers 4a, 4b are furnished in the lower proximity of the outer peripheral surface of the printing drum being opposite to the ink supply roller 3A. These printing rollers 4a, 4b are installed shiftably on a printing position where they are put in press contact with the outer peripheral surface of the printing drum 2 and on non-printing position where they are spaced apart from the printing drum 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary printing press.

[0002]

2. Description of the Related Art A printing drum having an outer peripheral surface for holding a base paper and having an ink roller provided on the inner side, and a printing roller provided in contact with the outer peripheral surface of the printing drum, is provided. 2. Description of the Related Art A rotary transfer printing press is known in which an ink is transferred to a sheet at an image transfer section provided to form a single-color image on one side by one pass of the sheet at the image transfer section.

[0003] In the above-mentioned conventional rotary printing press, generally only one printing roller 102 is provided corresponding to the ink roller 101 inside the printing drum 100 as shown in FIG. With one print roller, the transfer time of the ink to the paper is short, the image becomes thinner when the printing speed is increased, and the transfer speed of the ink to the paper becomes slower when the environment is low. There is a problem that an image becomes thin. Further, when the image is thinned, if the pressure of the print roller on the print drum is increased in order to increase the printing pressure and obtain the image density, the mechanical load on the print drum increases.

As means for solving the above-mentioned problem, there is disclosed an invention in which a belt press roller 103 composed of an endless belt is used instead of the print roller 102 in FIG. No. 5-162430). However, according to this known technique, the intermediate portion of the endless belt constituting the belt press roller 103 is pressed against the printing drum 100, and there is a problem that the printing pressure cannot be increased so much.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotary copying machine capable of extending the transfer time of ink to paper while maintaining a predetermined printing pressure suitable for printing.

[0006]

The present invention has the following configuration to achieve the above object.

(1) A printing drum having an ink roller provided on the inner side and an outer peripheral surface for holding the base paper on the outer side, and a printing roller provided so as to be in contact with the outer peripheral surface of the printing drum. A rotary transfer printing machine that transfers ink to paper at an image transfer unit provided with the image transfer unit and forms a single-color image on one side by one pass of the paper at the image transfer unit. There are provided n (n is an integer of 2 or more) print rollers that can be brought into contact at the same time (claim 1).

(2) In the rotary transfer printing press described in (1), each of the n printing rollers is provided with contacting / separating means for enabling contact with / separating from the printing drum (claim 2).

(3) In the rotary transfer printing press described in (2), each of the contacting / separating means operates in accordance with a printing speed at the image transfer section to change the number of contact of the printing roller with the printing drum. (Claim 3).

(4) In the rotary copying machine according to (2) or (3), each of the contacting / separating means operates individually in accordance with an ink temperature or the like in the image transfer section, so as to move the printing drum relative to the printing drum. The number of contacts of the print roller can be changed (claim 4). (5) In the rotary transfer printing press according to (1), (2), (3), or (4), when the number of the ink rollers is one, the plurality of the printing rollers correspond to each other, and In the case of a plurality of printing rollers, the printing rollers are provided so as to correspond to one ink roller at a time (claim 5).

(6) In the rotary copying machine according to (1), (2), (3), (4) or (5), the paper is applied to an area between the printing rollers. An air blowing means for blowing air in a direction to press the printing drum is provided.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) Example of an image forming apparatus suitable for carrying out the present invention FIG. 7 shows an overall configuration of a rotary copying machine suitable for carrying out the present invention. Part 10,
It comprises a plate discharging section 30, a printing drum 2, printing rollers 4a and 4b, a sheet feeding section 5, a sheet discharging section 41, a sheet discharging tray 52, and the like.

[Image Reading Unit] The image reading unit 100 includes an image scanning unit 99 below a document table 101 installed on the upper surface of the apparatus main body, and an automatic document feeder 9 above.
8 The automatic document feeder 98 has a well-known configuration in this type of image forming apparatus. In the course of conveyance, the size of the original P fed out from the original placing unit 60 is detected by a sensor for detecting the size of the original P, and the light emitted from the light source 103 of the image scanning unit 99 is floated to form an image. Is read, and is sent out onto a document discharge tray 96 for originals.

The image scanning unit 99 includes a light source 103 for illuminating the original P, a mirror M, an image forming optical system 106, and the like.
With respect to the original P placed on the upper side, the reflected light from the light source 103 is passed through a mirror M, an image forming optical system 106 and the like to a CCD 104.
As an electrical signal. The read image information is taken into the control unit. Although not shown in detail, the control unit receives input of read data of the document read by the image scanning unit 99 and information on the document and the print paper size, and a thermal head provided in the plate making unit 10 according to the input information. The control of the drive unit 12 and the selection control of the printing paper are performed.

[Plate making section] The plate making section 10 is arranged above one of the vertical lines passing through the center of the printing drum 2. In the plate making section 10, the stencil master 11 wound in a roll by the core material 11A is made of a thin thermoplastic resin film having a thickness of about 1 to 2 μm and is made of Japanese paper or synthetic fiber as a porous support, or a mixture of these two materials. A laminating structure is used by laminating a gauze.

The stencil master (base paper) 11 fed from the core material 11A in a rolled state is pressed against the thermal head 12 by a platen roller 13, and the control unit is controlled by the control unit. The heat generating element is selectively heated by the energization control using the drive signal from the controller. The stencil master 11 that has finished punching is the transport roller 1
4, cut into a required length by a cutter 15, fed in a tangential direction of the printing drum 2, and provided on an outer peripheral surface of the printing drum 2 so as to be openable and closable.
The tip is grasped and fixed by B.

[Plate discharging unit] The plate discharging unit 30 is disposed at a position facing the plate making unit 10 with the longitudinal center line of the printing drum 2 interposed therebetween. The plate discharging section 30 includes one roller 30A and the other roller 30B that are accessible to the printing drum 2.
When the printing drum 2 rotates counterclockwise, it receives the rear end of the stencil master 11 and receives the stencil discharge box 31 when the printing drum 2 rotates counterclockwise. Transfer to. The vertically movable compression member 33 is a stencil master 1 housed in the stencil discharge box 31.
Then, a space for accommodating the stencil master 11 to be discarded next is prepared.

[Printing Drum] The printing drum 2 is made of a cylindrical body made of stainless steel extending in a direction parallel to the rotation center axis O, and has a large number of perforations formed on the peripheral surface except for a part thereof. A thin mesh screen (not shown) made of, for example, synthetic fibers is attached to the outer surface. The printing drum 2 is driven to rotate in a direction indicated by an arrow around a rotation center axis O by a drive motor (not shown). An ink supply roller 3A that supplies ink to the inner peripheral surface of the printing drum 1 with an openable and closable clamper 2B that sandwiches the leading end, and an ink supply roller that is arranged in parallel with the ink supply roller 3A with a small gap therebetween; 3A, a doctor roller 3B for forming an ink reservoir (not shown), and an ink supply pipe 2A for rotatably supporting the printing drum 2 and supplying ink to the ink reservoir (not shown). Here, the ink supply pipe 2A, the ink supply roller 3A, and the doctor roller 3B constitute the ink supply device 3.

The clamper 2B is located at a position on the peripheral surface of the printing drum 2 where no perforations are formed, and swings in opposition to a stage made of a magnetic material having a mounting surface along one generatrix of the printing drum 2. The stage is movably supported and is configured as a gripping member that can freely move toward and away from the stage. The stage can place the tip of the stencil master 11,
The stencil master 11 whose tip is placed on the stage is fixed by being sandwiched between the stage and the clamper 2B. The area other than the leading end of the master 11 adheres to the plate cylinder surface due to the adhesive force of the ink supplied from the ink supply device 3 described below toward the surface of the printing drum 2.

[Printing Roller] Printing rollers 4a and 4b are provided near the outer peripheral surface of the printing drum 2 facing the ink supply roller 3A, and are in pressure contact with the outer peripheral surface of the printing drum 2 via the printing paper S. I have. These printing rollers 4a,
4b, a printing position (a position on the outer peripheral surface of the printing drum 2 corresponding to the image printing range b) and a non-printing position separated from the outer peripheral surface of the printing drum 2 (a non-image printing range shown in FIG. In accordance with a, the contact / separation means is controlled so as to selectively occupy a position separated from the outer peripheral surface of the clamper 2B in the centrifugal direction so as not to interfere with the clamper 2B.

[Sheet Feeding Unit] The sheet feeding unit 5 includes printing rollers 4a,
4b, it is provided on the upstream side in the transport direction of the paper S and near the printing rollers 4a and 4b. The paper feeding unit 5 includes a feeding roller 6, separation rollers 7, 8, a registration roller 9, and the like. The feed-out roller 6 is provided so as to be capable of coming into contact with and separating from the uppermost sheet S contained in the sheet feed tray 5A, and feeds out the print sheet S in a feeding direction corresponding to the direction of the arrow shown in the figure. Separating rollers 7 and 8 are paper S
The paper S fed from the feed roller 6 is separated and fed one by one.
The registration roller 9 sets and feeds the sheet S sent from the separation rollers 7 and 8 toward a position where the printing drum 2 and the printing rollers 4a and 4b are in contact with each other.

[Discharge Unit] The discharge unit 41 includes a separation claw 40 disposed near the outer peripheral surface of the print drum 2 for separating the sheet S from the print drum 2, an air knife 47 for jetting air, and a separation claw 40. The transport belt 42 is configured to transport the sheet S separated from the printing drum 2 to the discharge tray 52.
A suction fan 46 is disposed below the transport belt 42 to suck and transport the paper S to the transport belt 42 [discharge tray]. The discharge tray 52 is provided from a flat discharge tray. An end fence 203 for aligning the paper S in the transport direction and a side fence 201 for aligning the paper S in a direction perpendicular to the transport direction are provided.

[Overview of Printing Process] The following printing process is executed in the rotary copying machine having the above configuration. First, the printing drum 2 rotates counterclockwise. By this rotation, the used stencil master 11 wound around the print drum 2 is nipped by the belt 32 of the plate discharge unit 30, transferred to the plate discharge box 31, and removed from the print drum 2.

Next, the automatic document feeder 98 separates and feeds the original on the original placing section 60 by one sheet, is read by the CCD 104 of the image scanning section 99, and the information is sent to the control section as digital image data. Is stored. Based on the image data from the control unit, the stencil master 11 is perforated by the stencil making unit 10 and the perforated stencil master 11 is wound around the printing drum 2 using the clamper 2B.

In this state, the sheet S separated only by the sheet feeding section 5 is sent out from the registration roller 9 while synchronizing with the clockwise rotation of the printing drum 2 and sent out from the registration roller 9.
The sheet S is pressed against the printing drum 2 via the stencil master 11 by a and 4b. In this process, the ink supply device 3
The ink that has permeated into the mesh screen of the printing drum 2 passes through the perforations of the stencil master 11 and transfers to the surface of the paper S, and the original image is transferred and printed.

The printed paper S is separated from the printing drum 2 by the separation claw 40 and is brought into close contact with the transport belt 42 by the air ejected from the air knife 47. Is discharged.

(2) Examples Corresponding to the Claims The present invention employs n (n) printing rollers instead of the conventional one.
Is an integer of 2 or more), so that the contact surface of the sheet S with the print drum 2 in the image transfer portion is widened. In this case, as shown in FIGS. 1 to 5 and FIG. 7, two (or three or more) printing rollers 4a and 4b are provided opposite one ink roller 3A in the same image transfer portion. As shown in FIG. 6, in the same image transfer portion, 1
One printing roller 4'a is provided to face one ink roller 3'A, and one printing roller 4 "a is provided to face another ink roller 3" A.
There is a method of providing a plurality of sets of one ink roller and one printing roller.

Here, the image transfer portion refers to a portion where the image is transferred from the printing drum to the paper, and one image transfer portion is a single-color image formed on one side of the paper S by one pass of the paper S. An image transfer portion that can be formed.

The plurality of printing rollers 4a, 4b and 4 '
a, 4 ″ a are relative to the printing drum 2 so that the number of the printing drums 2 to be used can be changed according to conditions such as printing speed, ink viscosity, environmental temperature, and environmental humidity. 1 to 4, a specific example of the printing rollers 4a and 4b will be described with reference to FIGS. 'a, 4 "a can be similarly provided.

The contacting / separating means is provided so that the printing rollers 4a, 4b are separated from the peripheral surface of the printing drum 2 only during the passage of the clamper 2B in order to prevent the damper 2B from colliding with the printing rollers 4a, 4b when passing through the clamper 2B. And the print rollers 4a and 4b can be held in a state of being retracted from the peripheral surface of the print drum 2.

Hereinafter, the contact / separation means will be described. In FIG. 1, the printing drum 2 is integrally formed with a rotary copying machine, and is supported by a pair of frames (only one is denoted by reference numeral 60) reinforced by a bridging member 60a. On both sides of the printing drum 2 in the axial direction, a pair of cams 22L, 22
22R is provided substantially integrally with the printing drum 2.

Each of the cams 22L and 22R has a disk shape made of a synthetic resin, and has the same diameter contoured peripheral surface portion 22c of the printing drum 2 having the same diameter as the peripheral surface portion on which the stencil master 11 is wound. It has a gently mountain-shaped convex diameter portion 22a whose maximum height is larger than the outer peripheral contour of the same diameter contour peripheral portion 22c and the clamper 2B. These convex diameter portions 2
2a is provided at the same phase position on the left and right sides of the clamper 2B.

The convex diameter portion 2 of each cam 22L, 22R
2a, as shown in FIG. 2, the same-diameter contour peripheral surface portion 22c is located in the print roller separation range a which is the installation region of the clamper 2B.
Are positioned so as to correspond to the print roller contact area b, which is the non-installation area of the clamper 2B.

In FIG. 1, the printing roller 4 a is a synthetic rubber roller extending in parallel with the rotation center axis O of the printing drum 2 corresponding to the area of the image transfer portion, and is fixed to the shaft 70. The shaft 70 extends on both sides of the print roller 4a, supports roller-like cam followers 9L and 9R provided at positions facing the cams 22L and 22R, and is supported by arms 72L and 72R.

The intermediate portions of the arms 72L and 72R are penetrated while being supported by a shaft 74, and both ends of the shaft 74 are fixed to a frame 60 (a front side is not shown). With such a configuration, the arms 72L and 72R can swing about the shaft 74. Arm 72L, 72
Each free end of R is pulled by elastic springs 75L, 75R, and the arms 72L, 72R are biased to rotate counterclockwise about the shaft 74.

The rotation of the arms 72L, 72R by the urging of the springs 75L, 75R is performed by the cam followers 9L, 9R.
Abut on the cams 22L, 22R. In the print roller contact range b, the cam follower 9
L, 9R are the same-diameter contour peripheral surface portions 22c of the cams 22L, 22R.
The outer diameter of the cam followers 9L and 9R is slightly smaller than the outer diameter of the print roller 4a so that the paper is pressed between the outer peripheral surface of the print drum 2 and the print roller 4a when the print roller 4a is in contact. Have been.

With such a configuration, the cam followers 9L, 9L
When R is in the print roller contact range b, the print roller 4
a is held at a position in contact with the peripheral surface of the printing drum 2, and when the cam followers 9L and 9R are in the printing roller separation range a, the printing roller 4a is moved by an amount sufficient to allow the passage of the clamper 2B. 2, the interference with the clamper 2 </ b> B is automatically avoided with the rotation of the printing drum 2.

As shown in FIG. 1, the arms 72L, 72R
Each free end is cut out in a U-shape,
6L and 76R are formed. These engaging portions 76
L and 76R are solenoids 80L. It is formed in a size that can be engaged with the prismatic engaging elements 80L1 and 80R1 formed at the respective ends of the 80R.

The relationship between the solenoid 80R and the arm 72R will be described with reference to FIGS.
The engaging element 81R1 is formed at the tip of the plunger of the solenoid 80R as described above. This engaging element 81
The base of R1 is formed with a flange-shaped stopper 81R2 having a larger diameter than the engaging portion 76R.
An extensible spring 81R3 is provided between 1R2 and the main body side of the solenoid 80R.

By the action of the spring 81R3, the plunger of the solenoid 80R is urged in the direction in which the solenoid 80R is pulled out. And in the ON state, the spring 81R3
Is retracted into the body of the solenoid 80R against the elasticity of the solenoid 80R.

Therefore, as shown in FIG.
When the solenoid 80R is on the top of the convex diameter portion 22a and the solenoid 80R in the ON state is turned off, the solenoid 80R is moved to a position where the engaging element 81R1 enters the engaging portion 76R. It is fixed to a frame (provided corresponding to the frame 60 but not shown) as a stationary member. By attaching the solenoid 80R in this manner, as shown in FIG. 3, when the cam follower 9R is at the top of the convex diameter portion 22a, the solenoid 80R that is in the on state is turned off, and as shown in FIG. As described above, the print roller 4a can be held in a state of being separated from the print drum 2 by fitting the engagement element 81R1 into the engagement portion 76R as described above, and the print roller 4a can be brought into contact with the print drum 2 by being turned on in a timely manner. can do.

The solenoid 80R and the arm 72
If the mechanism in combination with R is referred to as contacting / separating means 90R which enables the printing roller to contact / separate from the printing drum, the same configuration as the contacting / separating means 90R will be applied to the solenoid 80L and the arm 7R.
2L, which is referred to as a contacting / separating means 90L, the contacting / separating means 90L and 90R are controlled at exactly the same timing to control the contact / separation of the printing roller 4a with respect to the printing drum 2. can do.

The printing roller 4b is also supported on the frame 60 with the same configuration as that of the printing roller 4a.
A cam follower that rotates in contact with the cams 22L, 22R is provided, and a contact / separation unit having the same configuration as the contact / separation units 90L, 90R is provided. Of these contacting / separating means around the printing roller 4b, those provided opposite to the contacting / separating means 90L are referred to as contacting / separating means 92L (not shown), and those provided opposite to the contacting / separating means 90R are referred to as contacting / separating means. Release means 92R (see FIG. 1)
Called.

These contact / separation means 90L, 90R, 92
The ON timing of each of the solenoids L and 92R is performed based on a signal from the paper detection sensor Sa provided at a position immediately after the registration roller 9 shown in FIG. Also, the timing of turning off is determined by the convex diameter portion 2
A point in time at which the cam follower of each contacting / separating means corresponds to the top of 2a is detected by a sensor (not shown), and is controlled by the signal.

As described above, the contact / separation means 90L and 90R and the contact / separation means 9 correspond to the printing rollers 4a and 4b, respectively.
2L and 92R, the printing rollers 4a, 4
A case where only an arbitrary one of b is brought into contact with the print drum 2 to function as a print roller and a case where both of them function as a print roller can be selected.

The control of the contact / separation means is appropriately performed in accordance with the ink temperature, the ink viscosity at the image transfer portion, the environmental temperature in the printing machine, and the like.
If the transfer state of the ink to the paper is desired to be good, control is performed such that two inks are used as shown in FIG. 2, and if the transfer state becomes excessive, only one ink is used as shown in FIG.

As described above, when the two transfer rollers 4a and 4b are provided in the image transfer portion, the paper is not directly contacted between the print rollers 4a and 4b by the print rollers. In some cases, the paper conveyance force is insufficient. In such a case, as shown in FIG. 5, a blowing means 95 for blowing air in a direction to press the sheet against the printing drum 2 is provided in a region between the printing roller 4a and the printing roller 4b. Thus, the blowing means 9
Even when 5 is provided, the above-mentioned contact / separation means is appropriately attached.

In the above example, two printing rollers 4a, 4a are provided for one ink roller 3A in the image transfer section.
Although the example corresponds to b, it is of course possible to provide three or more printing rollers as needed.

As shown in FIG. 6, in the image transfer portion,
Two ink rollers, an ink roller 3'A with a doctor roller 3'B and an ink roller 3 "A with a doctor roller 3" B, are provided, one for each of these ink rollers. It is also possible to provide the print rollers 4 "a facing each other. In this manner, if one ink roller corresponds to one print roller, two print rollers correspond to one ink roller. In this case, the deformation of the surface of the printing drum 2 which may occur in the case of the above can be solved without taking a solution involving an enlargement of the structure such as increasing the diameter of the ink roller.

In the configuration shown in Fig. 6, as required, contacting / separating means are provided for each of the printing rollers 4'a, 4 "a according to the above-described example.
According to the example shown in FIG. 5, a blowing means 95 'for blowing air is provided in a region of the printing drum 2 between the printing roller 4'a and the printing roller 4 "a.

In the above example in FIG. 6, the case where there are two sets of one ink roller and one printing roller in the image transfer portion is shown, but it is also possible to provide three or more sets.

[0052]

According to the first aspect of the invention, a single color image is transferred from a printing drum n times by n printing rollers, so that the transfer time of ink to paper is extended, and the printing speed is reduced. It is also possible to increase the speed and reduce the printing pressure, thereby improving the durability of the machine and reducing the printing noise.

According to the second and third aspects of the present invention, the number of contact of the printing roller with the printing drum can be controlled by the contact / separation means.
When the number of print rollers is small, the density difference with respect to the printing speed can be reduced by operating a small number of print rollers.

According to the fourth aspect of the invention, the image quality can be stabilized irrespective of the change in the printing conditions.

According to the fifth aspect of the present invention, a configuration in which one printing roller corresponds to one ink roller is caused when two printing rollers correspond to one ink roller. The possible deformation of the surface of the printing drum can be solved without taking a solution involving an enlargement of the structure, such as increasing the diameter of the ink roller.

According to the sixth aspect of the present invention, it is possible to eliminate the problem that the paper is peeled off from the print drum between the print rollers and rolled down by the wind pressure of the blower.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration of a contact / separation unit.

FIG. 2 is a front view illustrating a configuration of a contact / separation unit.

FIG. 3 is a front view illustrating a detailed configuration of a contact / separation unit.

FIG. 4 is a front view illustrating a detailed configuration of a contact / separation unit.

FIG. 5 is a front view illustrating the configuration of a print roller together with a blowing unit.

FIG. 6 is a front view illustrating the configuration of a print roller together with a blowing unit.

FIG. 7 is a diagram illustrating an outline of a configuration of a rotary copying machine suitable for carrying out the present invention.

FIG. 8 is an explanatory diagram of a conventional technique.

FIG. 9 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 3A, 3'A, 3 "A Ink rollers 4a, 4b, 4'a, 4" a Printing rollers 90L, 90R, 92L, 92R Contacting / separating means 95, 95 'Blowing means

Claims (6)

[Claims] 1. A printing drum having an ink roller provided on the inside and an outer peripheral surface for holding a base paper on the outer side, and a printing roller provided in contact with the outer peripheral surface of the printing drum, wherein the printing roller is provided. In a rotary transfer printing machine in which ink is transferred to a sheet at an image transfer section provided to form a single-color image on one side by one pass of the sheet at the image transfer section, the sheet is simultaneously transferred to the image transfer section. A rotary printing press, comprising n (n is an integer of 2 or more) print rollers that can be brought into contact with each other. 2. A rotary copying machine according to claim 1, wherein:
A rotary transfer printing press, wherein each of the n printing rollers is provided with a contacting / separating means for allowing contact with / separating from the printing drum. 3. A rotary copying machine according to claim 2,
The rotary copying machine according to claim 1, wherein each of the contacting / separating means operates in accordance with a printing speed at the image transfer unit to change the number of contact of the printing roller with the printing drum. 4. The rotary copying machine according to claim 2, wherein each of the contacting / separating means individually operates in accordance with an ink temperature or the like at the image transfer section, so that the printing roller moves with respect to the printing drum. A rotary printing press, wherein the number of contacts can be changed. 5. A rotary printing machine according to claim 1, wherein said plurality of printing rollers correspond to a plurality of said ink rollers when said one ink roller is provided. Wherein the printing roller is provided so as to correspond to each one of the ink rollers. 6. A rotary copying machine according to claim 1, wherein said paper is pressed against said print drum against an area between said print rollers. A rotary copying machine comprising a blowing means for blowing air.