JPH04265782A - Multicolor printing press - Google Patents

Abstract

PURPOSE:To prevent the cost increase or scaling-up of a multicolor printing press caused by expanding the span between a plurality of printing drums or by providing a dryer between the printing drums. CONSTITUTION:A belt 14 (or a rotary body such as a large diameter roller) having clamps 15 is provided in order to respectively circulate a plurality of papers on a predetermined track surface and a plurality of printing drums 9a-9d are provided so as to be capable of being brought into contact with and separated from the track surface. One printing drum is allowed to act at each time when one paper is circulated on the track surface once - several times and the different printing drum is allowed to act at the time of the next circulation and, by repeating this operation, multicolor printing due to the respective printing drums is performed. By allowing the printing drums different from each other to act between respective papers, the printings using a plurality of the papers are simultaneously processed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multicolor printing machine that prints using inks of a plurality of colors.

0002

2. Description of the Related Art Conventionally, various types of multicolor printing machines have been provided that can print in multiple colors with a single machine. For example, in a rotary press, a pair of print drums and press rollers that rotate while in contact with each other are arranged as one unit, and the number of these units is lined up in a number corresponding to the number of colors, and printing paper is sequentially placed between the print drum and press roller of each unit. It is known that printing in multiple colors is performed by passing the light through.

0003

[Problems to be Solved by the Invention] As this type of multicolor printing machine, in an offset printing machine, in order to prevent the ink transferred from the printing drum to the paper from transferring to the printing drum of the next unit, there is a gap between each unit. It is known that a dryer is installed in the dryer. However, configuring the printing press in this manner requires a large number of dryers, which poses a problem in that the cost of the apparatus increases.

[0004] As a method for drying ink, in addition to providing a dryer, for example, lengthening the span between each unit can be considered. However, this method has the problem of increasing the size of the printing press.Especially in printing presses that use a relatively large amount of ink, such as stencil printing machines, it is necessary to maintain a considerable distance between each unit, making the equipment It is too big and difficult to realize.

[0005] Therefore, the technical problem to be solved by the present invention is to provide a multi-color printing machine that can suppress the increase in cost and size of a printing machine that uses only one color of ink, and that is especially suitable for a stencil printing machine. Our goal is to provide the following.

[0006]

[Means for Solving the Problems, Actions and Effects] In order to solve the above-mentioned technical problems, the multicolor printing press according to the present invention is constructed as follows. That is, it includes a plurality of printing drums and a paper conveying means having a paper holding means that circulates on a predetermined orbital surface, and each printing drum and the orbital surface are arranged so as to be able to approach and separate from each other. and a paper feeding means for supplying paper to the paper holding means of the conveying means;
A paper ejecting means that takes out the paper from the paper holding means of the conveyance means, and a control means that presses a different printing drum and the orbital surface relative to each other each time a sheet of printing paper circulates on the orbital surface, sandwiching the paper therebetween. It is equipped with

In the above configuration, the printing paper is supplied from the paper feeding means to the holding means and circulated on the orbital surface of the conveying means. At this time, each time the printing paper circulates on the orbital surface, a different printing drum and the orbital surface are pressed against each other with the paper in between. Therefore, by changing the color of ink printed on each print drum, printing can be performed in a different color each time the paper circulates. In addition, in this configuration, in order to completely dry the printed ink, depending on the length of the orbit, once every two or three times the paper is circulated.
It is preferable to print each color.

[0008] In the printing press configured as described above, the plurality of drums do not operate while the paper circulates at least once. Therefore, since the ink transferred to the paper can be sufficiently dried during its circulation, it is possible to prevent the printing machine from increasing in size due to widening the span between each printing drum, and even with a stencil printing machine, multicolor printing is possible. It becomes possible. In addition, sufficient drying of the ink can be obtained by circulating the paper several times without providing a drying means, thereby preventing an increase in the cost of the printing press.

[0009] In the above structure, the paper conveyance means is provided with the same number of press rollers as the printing drums, and a belt means that is passed around the press rollers and passes between the printing drums and has paper holding means. and a driving means for circulating the belt means, each press roller can be configured to be able to approach and separate from the corresponding printing drum individually, and furthermore, a drying means can be provided around the belt means. .

[0010] With this structure, by circulating the belt means with the printing paper held by the holding means and pressing the press roller against the printing drum each time the printing paper circulates on the orbital surface, one Printing can be performed one color at a time. In this configuration, since the drying means is provided around the belt, the ink can be completely dried each time the paper circulates once. Furthermore, since the drying means only needs to be provided at one location, it is possible to prevent the device from becoming larger and from increasing costs.

Further, in the above structure, the paper conveyance means is composed of a single paper conveyance roller having a diameter larger than that of the print drum and having a paper holding means on its surface, and a drive means for rotationally driving this roller, The printing drum can be configured to be able to approach and separate from the surface of the conveyance roller, and furthermore, a drying means can be provided around the conveyance roller.

[0012] Even with this configuration, it is possible to print one color each time the paper is circulated around the conveyance roller once, and by providing the drying means in one place, it is possible to reduce the size and cost of the apparatus. It can be prevented.

Furthermore, in each of the above configurations, it is preferable that at least the same number of paper holding means as the printing drums are provided on the orbital surface of the conveying means.

With this configuration, at least the same number of sheets as the printing drums circulate on the orbital surface at the same time. Therefore, by pressing a separate printing drum onto each sheet of paper, printing can be performed using different inks in sequence on different sheets of paper, making it possible to perform multicolor printing extremely efficiently.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A multicolor printing press according to a first embodiment of the present invention shown in FIGS. 1 to 14 will be described in detail below. FIG. 1 is a schematic internal configuration diagram of this printing press. In the figure, 1 is a document reading section that first reads the document for plate making, 2 is a document tray with a cover 2a that can be opened and closed, and 3 is a device for irradiating light onto the document placed on the tray 2. Fluorescent lamp 4 is a color CCD (charge-coupled device) that outputs an electrical signal corresponding to the color of the original by guiding the light reflected from the original surface by several mirrors as shown by the dashed line. be. Note that the light source and mirror can be moved to the left from the illustrated position in order to scan the document surface.

Reference numeral 5 designates a plate-making and printing unit consisting of a plate-making unit 5a that performs plate-making based on the output signal from the color CCD 4, and a printing unit 5b that prints using the plate. The plate making section 5a is composed of a base paper roll 6 wound with a long base paper, a thermal head 7a, a platen roller 7b that presses the base paper against the thermal head 7a, and several feed rollers 8. The base papers are made into plates corresponding to the colors of the originals (black, blue, red, and yellow in this embodiment). On the other hand, the printing section 5b includes print drums 9a to 9d, and press rollers 12a to 12a, which are configured to be driven by an air cylinder or the like and can be placed in contact with or away from the print drums 9a to 9d. 12d. Each of the printing drums 9a to 9d is hollow and has two rollers 22a and 22b inside, and by the rotation of these rollers, the ink is uniformly kneaded between each roller and the back side is printed on the screen 23 (Fig. 2). It is designed to be applied from Each of the printing drums 9a to 9d includes, in order from the top,
Black, blue, red, and yellow inks are provided. Also, Figure 2
As shown in the figure, each printing drum 9a to 9d has a clamp 10A for holding the base paper wrapped around its surface.
~10D. The clamps 10A to 10D can be opened and closed about a shaft 10c, and are each composed of a pair of claws 10a and 10b provided in a plurality in the longitudinal direction of the shaft 10c, and a cam follower 10d fixed to the end of the shaft 10c. There is. And the cam (
By driving the cam follower 10d (not shown) as necessary, the cam follower 10d is swung to open and close the claws 10a and 10b.

As shown in FIG. 1, press rollers 12a~
A belt 14 is stretched around the drive roller 12d, a drive roller 13a, and a tension roller 13b arranged on the right side thereof, and these constitute a printing paper conveying means 11. Clamps 15 are provided at four locations on the belt 14 as paper holding means for holding four sheets of printing paper at different positions. In addition, each printing drum 9
At a position on the front side in the paper traveling direction (indicated by an arrow in the figure) with respect to a to 9d, the paper is sprayed onto the belt 14 side, and each printing drum 9a to 9d and press roller 12a to 1
A fan 16 is arranged to stabilize the entry of paper into the space 2d. In addition, two infrared lamps 17 are installed as an ink drying means in an empty area around the belt 14 on the rear side of the printing drum 9a in the paper traveling direction (in this embodiment, the lower right area of the drive roller 13a). One ultraviolet lamp 18 is provided. In addition, each lamp 17, 18
Three fans 19 are also arranged at a rear position in the paper traveling direction to urge the paper toward the belt 14, similarly to the respective printing drums 9a to 9d.

Here, a paper feeding means 20 is provided for supplying paper to the clamp 15, and a paper on which printing has been completed is transferred to the clamp 1.
The paper discharging means 21 for taking out the paper from the paper 5 will be explained. The paper feeding means 20 is composed of a combination of large and small rollers, and the paper is sent out one by one from the stocked part to the clamp 15 by the rotation of a large diameter roller 20a that presses the upper surface of the stocked printing paper. Also, the belt 14
As the details are shown in FIG. 3, two toothed belts 14a
and a screen 14b located therebetween. The clamp 15 consists of two toothed belts 14.
A plurality of claws 15a formed on a shaft 15c fixed in a direction perpendicular to a, and a rotating shaft 1 extending in the same direction as the shaft 15c.
5d, and a cam follower 1 fixed to the end of the shaft 15d to rotate the shaft 15d.
5e, and can hold the paper by sandwiching it between the claws 15a and 15b. Further, if necessary, the paper can be released by driving a cam (not shown) on the main body of the printing press.

On the other hand, a guide plate 21 shown in FIG. 4, which is a perspective view seen from below, is provided as a paper ejection means. This guide plate 21 has a shape in which the end on the belt 14 side is curved upward, and a notch 21 is formed in that part.
a are formed at regular intervals. The claws 15a and 15b of the clamp 15 provided on the belt 14 can pass through this notch 21a, and by opening the claws 15a and 15b at this time, the paper can be received from the belt 14. ing.

Next, the control relationship of this printing press will be explained using the block diagram shown in FIG. In the figure, 100 is a plate-making control CPU that controls the operation of each part during plate-making.
(central processing unit), 101 is a plate-making control circuit, 1
02 is a printing control C connected to the plate making control CPU 100 so as to be able to exchange signals with each other.
It is PU. The plate-making control CPU 100 includes a scanner motor 104 that moves the light source 3 and the like to scan the document surface when an operation panel 103 provided on the outer surface of the printing press is operated, and the above-mentioned platen roller 7b.
These motors 104 and 105 are connected to start the platen motor 105 for driving the motor. In addition, the plate-making control circuit 101 includes a color CCD sensor 4 and an external interface 106 (for example, by connecting a word processor, printing is performed based on electrical signals without printing the original).
, and the thermal head 7a, and starts the thermal head 108 in response to signals from the CCD sensor 4, external interface 106, and plate-making control CPU 100.

On the other hand, the print control CPU 102
It is connected to the operation panel 103, a drum encoder 107 that detects the status of the print drums 9a to 9d, and a belt encoder 108 that detects the status of the belt 14. Signals from these are input, and the print drum 9a
9d, press rollers 12a to 12d, and a main motor 109 that drives the drive roller 13a. The print control CPU 102 also controls the press rollers 12a to 12d separately from the print drum 9a during printing.
Solenoid valves 110a to 110 that switch actuators such as air cylinders to press against 9d
d. Opening/closing clamps 10A-1 for each printing drum 9a-9d
Motors 111a to 111 for respectively opening and closing 0D
d, and motors 112a to 112d provided to finely move the printing drums 9a to 9d in order to adjust for color shift that may occur because each color is printed with a separate roller.

In this printing machine, when a document is read, four plates are created corresponding to each color of the surface of the document. Then, each plate is moved from the feed roller 8 to the clamp 1 of the belt 14.
5, one by one, and further sent to the print drum corresponding to each color. FIG. 6 shows a state in which the plates are transferred from the belt 14 to each of the drums 9a to 9d (however, the plates are omitted). Claws 15a, 1 of clamp 15 of belt 14
5b is formed so as to be located between the claws 10a and 10b of the clamps 10A to 10D of the printing drums 9a to 9d, as shown in the figure. Therefore, when the clamp 15 holding the plate-made base paper passes through the portion of the clamp 10 on the printing drum side, the claws 10a, 10 of the clamp 10
b is opened, the part of the original paper that is not held between the claws of the belt-side clamp 15 enters between the claws 10a and 10b of the printing drum-side clamps 10A to 10D. At this time, the claw 10 of the drum side clamp 10
Almost at the same time as closing the printing drums a and 10b, the printing drums 9a to 9
d is moved downward in the figure by the above-mentioned fine motors 112a to 112d (the claw 15b of the belt side clamp 15 is moved by the drum 9
a to 9d) and by opening the claws 15a and 15b of the belt-side clamp 15, the raw paper is transferred from the belt 14 to the printing drum. Thereafter, printing can be performed by supplying ink to the plate in the manner described above and pressing the printing paper against each of the drums 9a to 9d.

Next, the movements of the paper, press roller, etc. during printing will be explained using FIGS. 7 to 14. FIG. 7 shows a state in which the first sheet of paper is fed by the paper feeding means 20 to the clamp 15A provided on the belt 14. At this time, the press rollers 12a to 12d are all set at positions away from the printing drums 9a to 9d. On the other hand, as shown in FIG.
The lowest drum 9d and press roller 12d are held by
When passing between the solenoid 110 described in FIG.
d is switched and the press roller 12d is switched to the printing drum 9.
It is pressed to the d side and the first color (yellow) is printed. As the sheet passes between the printing drums 9b-9d above it and the press rollers 12b-12d, each press roller 12b-12d maintains a position apart from the respective printing drum 9b-9d. Therefore, at this stage, the paper passes through a section provided with lamps 17 and 18, as shown in FIG. 9, without being printed in the second or subsequent colors, and the yellow ink is dried there.

This printing paper further advances to the paper feeding means 20
After passing through the section, the second sheet of paper is fed to the next clamp 15B as shown in FIG. At this time, each press roller 12a-12d is connected to each print drum 9a-12d.
Therefore, the first sheet of paper is placed at a distance from the yellow ink drum 9d.
and the press roller 12d. Then, as shown in FIG. 11, this paper is printed on a red ink drum 9c
When passing between the press roller 12c and the press roller 12c, the press roller 12c is pressed against the print drum 9c side and printing with red ink is performed, and almost simultaneously the press roller 12d is pressed against the print drum 9d side to print the second sheet. The paper is printed using yellow ink. each drum 9a as these sheets proceed upwards from there.
, 9b, 9c, press rollers 12a, 12b, 1
2c is far away, so for the first sheet of paper it is blue,
Printing with black ink is not performed, and printing with red, blue, and black ink is not performed on the second sheet of paper. Then, each sheet advances to lamps 17 and 18 as shown in FIG.
The yellow ink is dried on the first sheet of paper.

When the belt 14 continues to rotate and the second sheet of paper passes through the paper feeding means 20, a third sheet of paper is fed to the belt 14, although not shown. Then, using almost the same movements as described above, the first sheet of paper was printed with blue ink, the second sheet of paper was printed with red ink, and the third sheet of paper was printed with yellow ink. Thereafter, each ink is dried by lamps 17 and 18.

When the third sheet passes through the sheet feeding means 20, the fourth sheet passes through the belt 14 as shown in FIG.
is supplied to the clamp 15D. Then, by pressing the press roller corresponding to each sheet of paper toward the print drum, printing is performed with black ink on the first sheet, blue ink on the second sheet, red ink on the third sheet, and yellow ink on the fourth sheet. It will be done. Then, in order to ensure that the ink on the first sheet of paper is dried, the belt 14 is rotated one more time, and then the first sheet of paper is ejected from the guide plate 21 as shown in FIG. , another paper is supplied to the clamp 15A that was holding this paper. When printing is completed in this manner, the base paper that has been wound around the printing drums 9a to 9d is wound up by the base paper winding roller 24 (FIG. 1) provided on the left side thereof.

In this manner, the printing machine described above has 1
For each sheet of paper, paper feeding, yellow printing, drying, red printing, drying, blue printing, drying, black printing, drying, drying (the last drying process can also be omitted to shorten printing time) - Since the ink is dried while the paper is discharged and the printing paper is circulated, there is no problem of increasing the size of the apparatus by increasing the span between the printing drums. Furthermore, even if the lamps 17 and 18 are not necessarily provided, it is possible to sufficiently dry the ink by printing one color each time the paper is circulated several times, thereby further reducing the cost of the printing machine. Although it is possible to reduce the drying time, in this embodiment, lamps 17 and 18 are provided as drying means in order to shorten the time required for printing.

Next, a second embodiment of the present invention shown in FIG. 15 will be described. Note that the document reading unit provided at the top of the printing press has the same configuration as the first embodiment, so its explanation will be omitted. In this printing machine, the paper conveying means 50 is not composed of a plurality of press rollers, belts, etc., but is composed of a single large roller 57. And on the top of this roller 57, from the left, yellow,
Four printing drums 5 that print with red, blue, and black ink
1, 51b, 51c, and 51d are rollers 57, respectively.
It is provided so that it can take a position in contact with and a position away from the surface 50a. Further, 52 is a base paper roll, 53 is a paper feeding means for feeding printing paper to an openable/closable clamp 55 provided on the surface of the roller 57;
Reference numeral 54 denotes a paper discharge means for taking out the printed paper from the clamp 55. In the open area below the roller 57, several lamps 56 are arranged as drying means, similar to the first embodiment.

In the printing machine having this configuration, when the first sheet of paper is fed, printing is performed only with yellow ink by controlling only the yellow ink printing drum 51a to be pressed against the roller 57. When the first sheet of paper is fed, the red ink drum 51b is pressed against the roller 57 when the first sheet passes, and the yellow ink drum 51a is pressed against the roller 57 when the second sheet passes. By pressing against them, the first sheet of paper is printed with red ink and the second sheet of paper is printed with yellow ink. By sequentially printing one color each time the roller 57 rotates once, it is possible to print each sheet of paper in each of the colors yellow, red, blue, and black, similarly to the first embodiment. The paper on which printing has been completed is discharged from the paper discharge means 54, a new paper is supplied to the empty clamp, and printing in each color is performed in the same manner. Also in this configuration, by having a configuration in which the printing paper is circulated, it is possible to prevent an increase in the cost and size of the printing machine.

[Brief explanation of the drawing]

FIG. 1 is a schematic internal configuration diagram of a multicolor printing press according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a print drum.

FIG. 3 is a perspective view of a belt-side clamp section for printing paper.

FIG. 4 is a perspective view of a paper ejection means.

FIG. 5 is a block diagram showing the control relationship of this printing press.

FIG. 6 is a perspective view showing the relationship between the belt and the printing drum.

FIG. 7 is a diagram showing the state of paper feeding to the belt.

FIG. 8 is a diagram showing the printing state of paper.

FIG. 9 is a diagram showing the dry state of paper.

FIG. 10 is a diagram showing the feeding state of the second sheet of paper.

FIG. 11 is a diagram showing the state of printing in different colors on each sheet of paper.

FIG. 12 is a diagram showing the dry state of paper.

FIG. 13 is a diagram showing the feeding state of the fourth sheet of paper.

FIG. 14 is a diagram showing the paper discharge state.

FIG. 15 is a schematic internal configuration diagram of a multicolor printing press according to a second embodiment.

[Explanation of symbols]

1 Original reading section 2　Manuscript stand 2a Lid 3. Light source 4 Color CCD 5　Prepress printing department 5a　Prepress department 5b Printing department 6 Base paper roll 7a Thermal head 7b Platen roller 8 Feed roller 9a-9d Printing drum 10 Clamp 10a, 10b Nail 10c axis 10d Cam follower 11 Paper transport means 12a-12d Press roller 13a Drive roller 13b Tension roller 14 Belt 14a Toothed belt 14b Screen 15 Clamp 15a, 15b Claw 15c, 15d axis 15e Cam follower 16 Fan 17 Infrared lamp 18 Ultraviolet lamp 19 Fan 20 Paper feeding means 20a Roller 21 Paper ejection means (guide plate) 22a, 22b Roller 23 Screen 24 Base paper take-up roller 50 Paper transport means 51a-51d Printing drum 52 Base paper roll 53 Paper feeding means 54 Paper ejection means 55 Clamp 56 Lamp 57 Conveyance roller 100 Prepress control CPU 101 Plate making control circuit 102 Print control CPU 103 Operation panel 104 Scanner motor 105 Platen motor 106 External interface 107 Drum encoder 108 Belt encoder 109 Main motor

Claims (4)

[Claims] 1. A paper conveying means (11, 50) having a plurality of printing drums (9, 51) and a paper holding means (15, 55) circulating on a predetermined orbital surface (14, 50a). Each of the printing drums (9, 51) and the track surface (14, 50a) are arranged so as to be able to approach and separate from each other, and the paper holding means (15, 55) of the transporting means (11, 50)
) a paper feeding means (20, 53) for supplying paper to the paper;
Paper holding means (15, 5) of the conveying means (11, 50)
5) a paper ejection means (21, 54) for taking out the paper from the 1
Each time a sheet of printing paper circulates on said track surface (14, 50a), a different printing drum (9, 51) and said track surface (1
4, 50a) and control means (102) for relatively pressing the paper with the paper in between. 2. The paper conveying means (11) includes the same number of press rollers (12) as the printing drums (9), and the printing drums (12) that are stretched around the press rollers (12).
9) and includes a belt means (14) having the paper holding means (15), and a driving means (109) for circulating the belt means (14), and each of the press rollers (12) 2. The multi-color printing apparatus according to claim 1, wherein said belt means (14) is arranged so as to be able to approach and separate from said printing drum individually, and a drying means (17, 18) is provided around said belt means (14). Printer. 3. The paper conveyance means (50) has a diameter larger than the print drum (51), and the paper holding means (55) has a larger diameter than the print drum (51).
) on the surface thereof, and a driving means (109) for rotationally driving the roller (57). 2. The multicolor printing machine according to claim 1, further comprising a drying means (56) arranged around the paper transport roller (57) so as to be able to move toward and away from the paper transport roller (57). 4. The paper holding means (15, 55) comprises:
Raceway surface (14, 50a) of the conveyance means (11, 50)
4. A multicolor printing press according to claim 1, 2 or 3, characterized in that at least the same number of printing drums (9, 51) as there are provided on the printing drum.