JPH10323963A - Printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing device which enables one-side printing and both-side printing of various kinds without replacing ink even if the device is of a compact type. SOLUTION: The printing device includes a first and second plate cylinders 11, 12 each holding a printing plate having on its periphery two image regions, a first and second blanket cylinders 13, 14 having the same diameter as the plate cylinders 11, 12, an impression cylinder 15, a paper feed cylinder 16, a delivery cylinder 17, and a reversal cylinder 18 each having a diameter half that of the cylinders 11, 12, 13, 14, ink feed devices 20a, 20b disposed so as to come into contact with the first plate cylinder 11, and ink feed devises 20c, 20d disposed so as to come into contact with the second plate cylinder 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset printing apparatus for supplying ink to a printing plate held on a plate cylinder and transferring the ink onto a printing paper held on an impression cylinder via a blanket cylinder. More particularly, the present invention relates to a printing apparatus that can selectively execute single-sided printing and double-sided printing, and that can be used for both simplex and duplex printing.

[0002]

2. Description of the Related Art For example, Japanese Patent Publication No. 3-53115 discloses a printing apparatus capable of selectively performing one-sided printing and two-sided printing. This Tokuhei 3-53
The printing apparatus described in Japanese Patent Publication No. 115 includes a plurality of printing units having a plate cylinder, a blanket cylinder, and an impression cylinder having a diameter twice as large as the plate cylinder and the blanket cylinder, and a printing apparatus having a printing cylinder between adjacent printing units. A reversing cylinder having the same diameter as the impression cylinder is provided.

[0003] In this printing apparatus, after printing is performed on the surface of the printing paper by the first printing unit, the printing paper is transferred from the impression cylinder to the reversing cylinder with the trailing end of the printing paper as the leading end. Is turned over, and then printing is performed on the back side of the printing paper by the next printing unit.

[0004] When four-color printing is performed by using such a printing apparatus using, for example, yellow (Y), magenta (M), cyan (C), and black (K) inks, the number of printing units is four. It is installed in series.

[0005]

[Problems to be Solved by the Invention]
In the conventional printing apparatus described in Japanese Patent Application Laid-Open Publication No. H10-207, in order to perform double-sided reverse printing of an arbitrary color when performing multi-color printing, a reversing mechanism having a large reversing cylinder is arranged between each printing unit. Therefore, there is a problem that the printing apparatus becomes complicated and large.

In the conventional printing apparatus described in Japanese Patent Publication No. 3-53115, the printing is performed by sequentially passing the printing paper through each printing unit. By supplying yellow, magenta, cyan, and black inks respectively,
When double-sided printing is performed after color printing, it is impossible to print on both sides of printing paper with the same color ink. For this reason, in order to perform printing with the same color ink on both sides of the printing paper, in order to change the color of the ink in each printing unit, remove and wash the ink, and apply the same color ink to a plurality of printing units. After the supply, it is necessary to perform double-sided printing. Similarly, when performing two-color printing using the same two-color ink on both sides of the printing paper and then performing four-color printing, it is necessary to replace the ink in each printing unit.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides a printing apparatus which can perform various single-sided and double-sided printing without changing inks, in a compact form. With the goal.

[0008]

According to a first aspect of the present invention, ink is supplied to a printing plate held by a plate cylinder, and the ink is supplied onto a printing paper held by an impression cylinder via a blanket cylinder. A printing apparatus for both single-sided printing and double-sided printing to be transferred, comprising first and second plate cylinders holding a printing plate having two image areas on the outer periphery thereof, and a printing plate on the first plate cylinder. Two ink supply means for supplying ink to the image area by contacting the image area at
Abutment with an image area of the printing plate on the second plate cylinder for supplying ink to this image area.
Ink supply means, a first blanket cylinder having the same diameter as the first plate cylinder, and having the same diameter as the second plate cylinder. A first blanket cylinder abutting the second plate cylinder, the first and second blanket cylinders;
[1/2] of the plate cylinder and the first and second blanket cylinders
An impression cylinder having a diameter twice as large as that of the first and second blanket cylinders and holding the printing paper on the outer periphery thereof; a printing paper supply means for supplying the printing paper to the impression cylinder; A printing sheet reversing means capable of receiving a printing sheet on which printing of the first side has been completed from the cylinder, performing a reversing operation of reversing the printing sheet after turning over the printing sheet, and performing necessary printing from the impression cylinder And a control means for selectively operating the printing paper reversing means.

According to a second aspect of the present invention, there is provided one-sided printing and two-sided printing in which ink is supplied to a printing plate held on a plate cylinder, and the ink is transferred onto a printing paper held on an impression cylinder via a blanket cylinder. A printing apparatus for printing, wherein n and m are natural numbers, and first and second plate cylinders for holding a printing plate having [2n] image areas on the outer periphery thereof; [2n] ink supply means for supplying ink to this image area by contacting the image area on the printing plate, and by contacting the image area on the printing plate on the second plate cylinder [2n] ink supply means for supplying ink to this image area, and a first blanket cylinder having the same diameter as the first plate cylinder and abutting on the first plate cylinder. Having the same diameter as the second plate cylinder, A first blanket cylinder in contact with the second plate cylinder, and a diameter of [(2m-1) / 2n] times that of the first and second plate cylinders and the first and second blanket cylinders; An impression cylinder that holds [2m-1] printing paper on its outer periphery and abuts the first and second blanket cylinders; a printing paper supply unit that supplies the printing paper to the impression cylinder; A printing sheet reversing means capable of receiving a printing sheet on which printing of the first side has been completed from the cylinder, performing a reversing operation of reversing the printing sheet after turning over the printing sheet, and performing necessary printing from the impression cylinder And a control means for selectively operating the printing paper reversing means.

According to a third aspect of the present invention, there is provided one-sided printing and two-sided printing in which ink is supplied to a printing plate held on a plate cylinder, and the ink is transferred onto a printing paper held on an impression cylinder via a blanket cylinder. A printing apparatus for printing, wherein n and m are natural numbers, and first and second plate cylinders holding a printing plate having [2n + 1] image areas on the outer periphery thereof; [2n +] for supplying ink to this image area by contacting the image area in the printing plate of
1] ink supply means, [2n + 1] ink supply means for supplying ink to the image area of the printing plate on the second plate cylinder by contacting the image area, 1 has the same diameter as the plate cylinder,
A first blanket cylinder abutting on the plate cylinder, a first blanket cylinder having the same diameter as the second plate cylinder and abutting on the second plate cylinder, and the first and second blanket cylinders; [2m / (2n +) of the plate cylinder and the first and second blanket cylinders
1)] An impression cylinder having a double diameter and holding 2 m of printing paper on the outer periphery thereof, and contacting the first and second blanket cylinders; and a printing sheet for supplying the impression paper to the impression cylinder A supply unit, a print sheet reversing unit capable of receiving a print sheet on which printing on the first surface has been completed from the impression cylinder, performing a reversal operation of reversing the print sheet after turning over the print sheet, The printing apparatus further comprises a printing paper discharging unit for discharging printing paper on which necessary printing has been completed from the impression cylinder, and a control unit for selectively operating the printing paper reversing unit.

[0011] The invention according to claim 4 is the invention according to claims 1 to 3.
In the invention described in any one of the embodiments, the printing paper reversing unit may move the printing paper, on which printing on the first surface has been completed, from the holding position at the time of printing the first surface on the outer periphery of the impression cylinder to the first and second printing papers. Is passed to a position where the phase is delayed by a distance that is an integral multiple of the outer circumference of the plate cylinder.

According to a fifth aspect of the present invention, in the fourth aspect of the invention, the printing paper reversing means holds the printing paper on which the printing of the first surface has been completed and rotates in one direction. The printing paper on which the printing of the first surface has been completed is held by the reversing cylinder with the trailing edge of the printing paper being the leading end, whereby the printing paper is turned over.

According to a sixth aspect of the present invention, there is provided one-side printing and two-sided printing in which ink is supplied to a printing plate held on a plate cylinder, and the ink is transferred onto a printing paper held on an impression cylinder via a blanket cylinder. A printing apparatus for printing, wherein X and Y are mutually prime, and a plate cylinder holding a printing plate having X image regions on its outer periphery is in contact with an image region of the printing plate on the plate cylinder. Thereby, X ink supply means for supplying ink to the image area, a blanket cylinder having the same diameter as the plate cylinder and abutting on the plate cylinder, and a blanket cylinder of the plate cylinder and the blanket cylinder are provided. An impression cylinder having a diameter of Y / X times and holding Y sheets of printing paper at its outer periphery and abutting against the blanket cylinder; printing paper supply means for supplying printing paper to the impression cylinder; In one holding area on the torso After receiving the printing paper from which printing has been completed from the one holding area and performing the reverse of the printing paper, the printing cylinder performs printing after [nX + Y] (n is a natural number) times from the one holding area. A printing paper reversing means capable of executing a reversing operation to be transferred to any one of the holding areas, a printing paper discharging means for discharging printing paper required for printing from the impression cylinder, and a selective printing paper reversing means And control means for causing the control device to operate.

[0014] The invention according to claim 7 is the invention according to claims 1 to 6.
In the invention described in any one of the embodiments, the ink supply unit can selectively contact an arbitrary image area of a printing plate in each of the first and second plate cylinders.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view of a printing apparatus according to the present invention.

In this embodiment, an image is recorded on a printing plate having no image recorded on the first and second plate cylinders 11 and 12 on which no image is recorded, and is then supplied to the printing plate. The present invention is applied to a printing apparatus that performs printing by transferring the transferred ink to printing paper S held on an impression cylinder 15 via first and second blanket cylinders 13 and 14.

This printing apparatus includes a first plate cylinder 11 movable between a first printing position shown by a solid line in FIG. 1 and an image recording position shown by a two-dot chain line, and a first printing cylinder 11 shown by a solid line in FIG. And a second plate cylinder 12 movable between the second printing position and the image recording position.

The first plate cylinder 11 moved to the first printing position
Around the printing plate, an ink supply device 20a for supplying black (K) ink to the printing plate, an ink supply device 20b for supplying magenta (M) ink to the printing plate, and a printing plate. A dampening water supply device 21 for supplying dampening water is arranged. Further, around the second plate cylinder 12 moved to the second printing position, an ink supply device 20c for supplying, for example, cyan (C) ink to the printing plate, and a yellow (Y) ink to the printing plate, for example. And a dampening solution supply device 22 for supplying dampening solution to the printing plate. Further, the first plate cylinder 11 moved to the image recording position
Alternatively, around the second plate cylinder 12, a plate supply section 23, a plate discharge section 24, an image recording device 25, and a development processing device 26 are arranged.

The printing apparatus includes a first blanket cylinder 13 provided to be able to contact the first plate cylinder 11 and a second blanket cylinder provided to be able to contact the second plate cylinder 12. A drum 14 and an impression cylinder 15 provided so as to be able to contact the first and second blanket cylinders 13 and 14 at positions different from each other;
A paper feed cylinder 16 for passing the printing paper S supplied from the paper feeding unit 27 to the impression cylinder 15, and a chain 19 for discharging the printed printing paper S received from the impression cylinder 15 to the paper ejection unit 28.
, A reversing cylinder 18 for reversing the printing paper S at the time of duplex printing, and a blanket cleaning device 29.

The paper feed cylinder 16, the discharge cylinder 17 and the reversing cylinder 18 constitute printing paper reversing means according to the present invention.

The first and second plate cylinders 11 and 12 are connected to first and second plate cylinder moving mechanisms 31 and 32, respectively, which will be described later. 31,3
By the drive of No. 2, it reciprocates between the above-described first or second printing position and the image recording position.

FIG. 2 shows first and second plate cylinder moving mechanisms 31 and 3.
FIG. 3 is a side sectional view of the first plate cylinder moving mechanism 31. FIG. In addition, the first and second plate cylinder moving mechanisms 31,
Since the reference numeral 32 has a similar configuration symmetrical to each other, members common to the first and second plate cylinder moving mechanisms 31 and 32 are denoted by the same reference numerals.

The first and second plate cylinder moving mechanisms 31 and 32
In order to move a pair of bearings 33 that support the support shafts 36 of the first and second plate cylinders 11 and 12, a slot 35 formed in the side plate 34 is provided. Only 35 is shown, and the illustration of the side plate 34 is omitted.) The bearing 33 is supported by a slide holder 38 that can move along a guide member 37. A nut 42 is provided on the slide holder 38. The nut 42 is screwed with a ball screw 41 connected to a drive shaft of the motor 39.

For this reason, the first plate cylinder 11 is
Is movable together with the slide holder 38. The first plate cylinder 11 is provided with a guide member 37.
Along with the ball screw 41 and a solid line in FIG.
Further, it moves between a first printing position indicated by a broken line in FIG. 2 and an image recording position indicated by a two-dot chain line in FIGS. 1 and 2. Similarly, the second plate cylinder 12 can be moved together with the slide holder 38 by driving the motor 39. Then, the second plate cylinder 12 is moved along the guide member 37 and the ball screw 41 by a solid line in FIG. 1 and by a second printing position indicated by a broken line in FIG. 2 and a two-dot chain line in FIGS. 1 and 2. Move to the indicated image recording position.

In the vicinity of the image recording position on the side plate 34, a stopper 44 that rotates around a shaft 43 is provided. The movement angle of the stopper 44 in the left-right direction is restricted by a pair of positioning pins 45. Motor 39
When the bearing 33 of the first plate cylinder 11 moved by the drive of the first plate cylinder 11 comes into contact with the stopper 44, the first plate cylinder 11
Is positioned and fixed at the image recording position. Also,
When the bearing 33 of the second plate cylinder 12 moved by the drive of the motor 39 comes into contact with the stopper 44, the second
Plate cylinder 11 is positioned and fixed at the image recording position.

In the vicinity of the first and second printing positions on the side plate 34, the first and second plate cylinders 11 and 1 are provided, respectively.
A fixing member (not shown) for fixing the second bearing 33 is provided. The first plate cylinder 11 is positioned and fixed at the first printing position by the fixing member, and the second plate cylinder 12 is fixed.
Is positioned and fixed at the second printing position by this fixing member.

Bearings 33 of the first and second plate cylinders 11 and 12
Is connected to a substantially circular detent member 46 having a notch in a part thereof. Further, a locking member 48 is provided on a side of the rotation stopping member 46. The locking member 48 is moved by the driving of the air cylinder 47 between a position where it engages with the notch of the rotation stopping member 46 and a position where it is separated from the notch. For this reason, the first and second plate cylinders 11 and 12 are driven by the air cylinder 47 so that the locking members 48 are moved.
Is engaged with the notch of the rotation stopping member 46,
The rotation angle position is positioned and fixed.

First, using the rotation stopping member 46 and the like,
The reason for positioning and fixing the rotational angle positions of the second plate cylinders 11 and 12 is as follows. That is, the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 1
If there is a shift in the rotational positional relationship of No. 4, problems such as print positional shift and collision between components occur, so that the positional relationship between the two needs to be always constant. At this time, at the image recording position, when recording an image on the printing plate held on the first and second plate cylinders by the image recording device 25 described later, the first and second plate cylinders 11, The rotation angle position 12 is monitored by a rotary encoder (not shown) or the like. However, when moving from the image recording position to the first and second printing positions, the first and second plate cylinders 11 and 12 rotate, and the first and second plate cylinders 11 and 12 and the first and second plate cylinders 11 and 12 are rotated. In some cases, the rotational positional relationship with the second blanket cylinders 13 and 14 may deviate. For this reason, the rotation stopping member 4
The rotation angle positions of the first and second plate cylinders 11 and 12 are positioned and fixed by utilizing 6 and the like.

The first blanket cylinder 13 and the first plate cylinder 11 moved to the first printing position, and the second blanket cylinder 14 and the second plate cylinder 12 moved to the second printing position. Are connected by gears attached to their ends. Therefore, when the two gears come into contact with each other, the locking member 48 is separated from the notch of the rotation stopping member 46, and the first and second plate cylinders 11 and 12 are moved while rotating, so that each The gears mesh with each other.

As described above, the plate feeding section 23 and the plate discharging section 24 are arranged around the first plate cylinder 11 or the second plate cylinder 12 moved to the image recording position. FIG. 4 shows the first plate cylinder 11 or the second plate cylinder 1 moved to the image recording position.
FIG. 2 is a schematic side view showing a plate 2 together with a plate feeding unit 23 and a plate discharging unit 24.

The plate supplying section 23 is composed of a magazine 52 for storing a long roll-shaped printing plate P on which no image is recorded in a light-tight state, and a pair of guide rollers 53 for this magazine 52.
Guide member 5 for guiding the leading end of the printing plate P drawn out from the first plate cylinder 11 or the surface of the second plate cylinder 12
5 and a guide roller 56, and a cutter 54 for cutting the long printing plate P into a sheet-shaped printing plate P.

The first and second plate cylinders 11 and 12 are provided with a holding claw 57 for holding the leading end of the printing plate P supplied from the plate supply unit 23. The gripper 57 opens and closes by bringing the cam follower portion 58 into contact with a cam (not shown) as the first plate cylinder 11 or the second plate cylinder 12 rotates. Incidentally, the first plate cylinder 11 or the second plate cylinder 12 moved to the image recording position is
Abuts on the friction wheel 62 rotating by the drive of the surface thereof,
The motor 61 rotates at a low speed by being driven.

After the printing is completed, the plate discharging section 24 moves the first plate cylinder 1
A claw 63 for peeling off the printing plate P held on the first or second plate cylinder 12, and a transport roller 65 for guiding the printing plate P peeled off by the action of the claw 63 to a plate discharge tray 64.
And a guide member 66.

The magazine 52 is driven by a pair of guide rollers 53.
Of the printing plate P pulled out from the claw 5
7, the first plate cylinder 11 or the second plate cylinder 1 with the rotation of the first plate cylinder 11 or the second plate cylinder 12.
2 around the outer periphery. The rear end of the printing plate P cut by the cutter 54 is suction-held by a suction device (not shown) provided on the outer peripheral portion of the first plate cylinder 11 or the second plate cylinder 12. In this state, the motor 6
1, while rotating the first plate cylinder 11 or the second plate cylinder 12 at a low speed, the outer peripheral portion of the first plate cylinder 11 or the second plate cylinder 12 by the image recording device 25 described in detail later. The modulated laser beam is irradiated on the surface of the printing plate P held in the printer, and an image is recorded.

The printing plate P mounted on the outer peripheral portion of the first plate cylinder 11 is applied to the printing plate P by the image recording device 25 as shown in FIG.
As shown in (1), an image area 67a and an image area 67b are recorded. 5B, an image area 67c and an image area 67d are recorded on the printing plate P mounted on the outer peripheral portion of the second plate cylinder 12, as shown in FIG. The image area 67a and the image area 67b are recorded at positions that are equally distributed (that is, 180 degrees apart from each other) when mounted on the outer peripheral portion of the first plate cylinder 11. Similarly, the image area 67c
The image area 67d is recorded at a position where the parts are equally distributed (that is, 180 degrees apart from each other) when mounted on the outer peripheral portion of the second plate cylinder 12.

On one side of the printing paper S, yellow, magenta,
When performing four-color printing using cyan and black inks, the image area 67a is used for printing with black ink, and the image area 67b is used for printing with magenta ink. The area 67c is used for printing with cyan ink and the image area 67d
Is used for printing with yellow ink. When performing two-color printing using two colors of ink on both sides of the printing paper, the image area 67a and the image area 67b are used for printing with the first color ink, and the image area 67c and the image area 67c are used for printing. The area 67d is used for printing with the second color ink. In the case where printing of one to three colors on one side or printing of one color on both sides is performed, one or two of the image areas 67a, 67b, 67c and 67d are not created.

In the above-described embodiment, in order to simplify the structure of the first plate cylinder 11 or the second plate cylinder 12, the outer periphery of the first plate cylinder 11 or the second plate cylinder 12 is provided. Two image areas 67a and 6
7b or 67c, 67d is provided. However, as shown in FIG. 6, the first plate cylinder 11 or the second plate cylinder 12 is provided with two grippers 57 each, whereby the first plate cylinder 11 or the second plate cylinder is provided. Each of the printing plates P may hold two printing plates P. Also in this case, the first printing plate P is equally distributed so that the image areas formed by the respective printing plates P are equally distributed (that is, 180 degrees apart from each other). It needs to be held on the plate cylinder 11 or the second plate cylinder 12.

In this case, as described above, when printing in one to three colors on one side or in printing in one color on both sides, etc., the image areas 67a and 67 shown in FIG.
It is not necessary to dispose the printing plate P at a position corresponding to one or two of the image areas b, 67c and 67d.

FIG. 7 is a perspective view showing the structure of the image recording device 25 described above.

The image recording device 25 applies a laser beam in the main scanning direction to the printing plate that moves in the sub-scanning direction by the rotation of the first plate cylinder 11 or the second plate cylinder 12 that has moved to the image recording position. The image is recorded by scanning 91. The image recording device 25 includes a semiconductor laser 92 that emits a laser beam 91 as a recording beam modulated based on an image signal, and a lens group 93 that focuses the laser beam 91 emitted from the semiconductor laser 92.
, A polygon mirror 94 as a deflecting device, a scanning lens group 95, and a folding mirror 96. The laser beam 91 emitted from the semiconductor laser 92 is deflected by the action of the polygon mirror 94 to become a scanning beam directed in the main scanning direction, and scans the entire printing plate along with the movement of the printing plate in the sub-scanning direction. Record the desired image on the printing plate.

Referring again to FIG. 1, as described above, around the first plate cylinder 11 moved to the first printing position, the ink supply devices 20a and 20b are provided. An ink supply device 20c and an ink supply device 20d are arranged around the second plate cylinder 12 moved to the second printing position. These ink supply devices 20a, 20
b, 20c and 20d (when these are collectively referred to as “ink supply device 20”), a pair of left and right side plates 7
It has a plurality of ink rollers 68 and an ink fountain 69 pivotally supported between the two.

The ink supply devices 20a and 20b perform a swinging operation by rotating a pair of side plates 72 about a shaft 71 by the action of cams 81 and 82 described later. And
Due to this swinging operation, the two image areas 67a and 67b formed on the printing plate P held on the outer peripheral portion of the first plate cylinder 11
When the ink roller 68 of the ink supply device 20a or 20b comes into contact with an arbitrary image area, ink can be supplied only to a necessary image area. Similarly, the ink supply devices 20c and 20d also
The pair of side plates 72 are moved by the shafts 7 by the action of cams 81 and
The swinging operation is performed by rotating about 1. Then, by the swinging operation, two image areas 67c formed on the printing plate P held on the outer peripheral portion of the second plate cylinder 12,
67d, an ink supply device 20
By contacting the ink roller 68 of c or 20d, ink can be supplied only to a necessary image area.

FIG. 8 is a schematic view showing the swing mechanism of the ink supply device 20 described above, and FIG. 9 is a plan view of the cams 81 and 82.

Each of the cams 81 and 82 has an arc shape, and the cams 81 and 82 are 18
They are arranged in a positional relationship separated by 0 degrees. These positional relationships match the positional relationship between the two image regions 67a, 67b or 67c, 67d formed on the printing plate P.

On the other hand, the side plate 7 in the ink supply device 20
A support shaft 73 is slidably inserted through 2. One end of the support shaft 73 is provided with a bearing 74 as a cam follower. The support shaft 73 is configured such that its axial position can be displaced by a cylinder mechanism 77 connected to the support shaft 73 via a connecting rod 75 and an L-shaped bracket 76.

The movement of the support shaft 73 in the axial direction is performed by the support shaft 7.
3 is carried out at a position facing a concave portion 78 (see FIG. 9) formed by the cam 81 and the cam 82. And the bearing 74 is
Along with the movement of the support shaft 73, a first position indicated by a solid line in FIG. 8, a second position where the position of the bearing 74 matches the position of the cam 81 in the axial direction of the support shaft 73,
The position of the bearing 74 moves between the position of the cam 82 and the third position which coincides with the position of the cam 82 with respect to the axial direction.

In a state where the bearing 74 attached to the support shaft 73 is located at the first position shown in FIG. 8, the ink roller 68 of the ink supply device 20 is always in contact with the printing plate, and Ink is supplied to the entire two image areas 67a, 67b or 67c, 67d formed in P.

The bearing 7 attached to the support shaft 73
When the first plate cylinder 11 or the second plate cylinder 12 rotates, the bearings 7 are in a state where the first plate cylinder 4 is disposed at the second position.
4 rides on the cam 81 so that the side plate 72
1, the ink supply device 20 swings. At this time, since the cam 81 has the same positional relationship as the image area 81a or 81c, the ink supply device 20
The ink roller 68 supplies ink only to one of the two image areas 67a, 67b or 67c, 67d formed on the printing plate P.

Further, when the bearing 74 attached to the support shaft 73 is located at the third position, the bearing 74 is attached to the cam 82 as the first plate cylinder 11 or the second plate cylinder 12 rotates. By riding, the side plate 72 rotates about the shaft 71, and the ink supply device 20 swings.
At this time, the ink roller 68 of the ink supply device 20
One of the two image areas 67a, 67b or 67c, 67d formed on the printing plate P has one of the image areas 67a, 67d.
The ink is supplied only to 7c.

Therefore, the printing paper S
When printing in four colors of yellow, magenta, cyan, and black on one side, black ink is supplied to the ink supply device 20a, magenta ink is supplied to the ink supply device 20b, and cyan ink is supplied to the ink supply device 20c. And the yellow ink are supplied to the ink supply device 20d. And the ink supply devices 20a,
0c, the bearing 74 is located at the third position,
In the ink supply devices 20b and 20d, the bearing 7 is used.
4 in the second position. Thereby, the image area 67
a, black ink from the ink supply device 20a;
The image area 67b receives magenta ink from the ink supply device 20b, and the image region 67c receives the ink supply device 20c.
, And yellow ink from the ink supply device 20d to the image area 67d.

In the case of performing two-color printing of cyan and magenta on both sides of the printing paper subsequent to the one-sided four-color printing, the bearings 74 are arranged at the first positions in the ink supply devices 20b and 20c. Also,
The ink supply devices 20a and 20d are retracted in a direction away from the first and second plate cylinders 11 and 12 by swinging the side plate 72 about the shaft 71 by a drive source (not shown). Thus, magenta ink can be supplied from the ink supply device 20b to the image regions 67a and 67b, and cyan ink can be supplied from the ink supply device 20c to the image regions 67c and 67d.

As shown in FIG. 1, among the four ink supply devices 20a, 20b, 20c and 20d, the ink supply devices 20b and 20c are provided for the first and second plate cylinders 11 and 12 described above. When moving, the first and second plate cylinders 11, 1
In order to avoid the interference with FIG.
Is configured to move to a position indicated by a two-dot chain line. Similarly, two dampening water supply devices 21, 2
One of the dampening water supply devices 22 is a second plate cylinder 1
In order to avoid interference with the second plate cylinder 12 at the time of the movement of 2, the drive source (not shown) is configured to move to a position shown by a two-dot chain line in FIG.

Referring again to FIG. 1, the dampening solution supply device 2
Reference numerals 1 and 22 are for supplying dampening water to the printing plate before the ink is supplied to the printing plate by the ink supply device 20. In addition, the dampening water supply devices 21 and 22 are the first,
Although one for each of the second plate cylinders 11 and 12 is provided, two for each of the first and second plate cylinders 11 and 12 may be provided. In this case, each fountain solution supply device supplies the fountain solution only to the corresponding printing plate, as in the case of the ink supply device 20 described above.

Below the first plate cylinder 11 or the second plate cylinder 12 that has moved to the image recording position, the above-described developing device 26 is provided. The developing device 26 includes a developing unit, a stabilizing unit, and a washing unit, and is configured to be able to move up and down between a standby position indicated by a solid line and a developing position indicated by a two-dot chain line in FIG.

When developing the printing plate on which an image is recorded by the image recording device 25 by the developing device 26, the first plate is driven by the motor 61 shown in FIG.
The developing plate, the stabilizing unit, and the washing unit are sequentially brought into contact with the printing plate rotating with the plate cylinder 11 or the second plate cylinder to develop, stabilize, and wash the printing plate. It should be noted that a squeezing section for squeezing the liquid from the printing plate surface may be further provided.

The first and second blanket cylinders 13 and 14, which are provided so as to be able to contact the first and second plate cylinders 11 and 12,
It has the same diameter as the first and second plate cylinders 11 and 12, and a blanket for ink transfer is mounted on the outer periphery thereof. Then, the first and second blanket cylinders 13, 1
Numeral 4 is configured to be able to freely contact and separate from the first and second plate cylinders 11 and 12 and the impression cylinder 15 by a cylinder insertion mechanism described later.

The diameters of the first and second blanket cylinders 13 and 14 having a soft blanket mounted on the outer periphery thereof are slightly reduced by contact with the first and second plate cylinders 11 and 12. The same diameter described in this specification is
This includes the case where a slight error occurs due to such a change in diameter. Further, an impression cylinder 15, a paper feed cylinder 16, a paper discharge cylinder 17, and a reversing cylinder 18, which will be described later, include first and second plate cylinders 11 and 12, and first and second blanket cylinders 13,
It has a diameter of [1/2] of the diameter of 14 but also in this case, it includes an error generated due to a change in the diameter as described above.

FIG. 10 shows the first blanket cylinder 13.
FIG. 2 is a schematic diagram showing a body insertion mechanism. The mechanism for inserting the second blanket cylinder 14 also has the same configuration as the mechanism for inserting the first plate cylinder 13 shown in FIG.

An eccentric shaft 102 having a center different from that of the shaft 101 is continuously provided beside the shaft 101 that rotatably supports the first blanket cylinder 13. Further, around the eccentric shaft 102, an eccentric bearing 103 whose center is further different from the shafts 101 and 102 is provided. Therefore, as shown in FIG. 10, the center 104 of the shaft 101 (that is, the center of the first blanket cylinder 13), the center 105 of the eccentric shaft 102,
The centers 106 of the eccentric bearings 103 are arranged at different positions.

The fixed plate 107 fixed to the eccentric shaft 102 and the fixed plate 108 fixed to the eccentric bearing 103 are connected by two connecting plates 111 and 112 constituting a link mechanism. The connecting portion between the two connecting plates 111 and 112 has a cylinder rod 114 of the air cylinder 113.
The tip is connected. The main body of the air cylinder 113 is connected to one end of a rotation plate 116 that rotates around a shaft 115. Further, the other end of the rotating plate 116 is
It is connected to a fixed plate 118 fixed to the eccentric bearing 103 via a rod 117.

The rotating plate 116 and the shaft 120 of the eccentric member 119 are connected to the two connecting plates 12 constituting the link mechanism.
1, 122. The distal end of a cylinder rod 124 of an air cylinder 123 fixed to the apparatus main body is connected to a connecting portion between the two connecting plates 121 and 122. Further, the worm wheel 125 connected to the eccentric member 119 is screwed with a worm gear 127 rotated by driving of the motor 126.

In this configuration, when the cylinder rods 114 and 124 of the air cylinders 113 and 123 are contracted, as shown in FIG. 10, the surface of the first blanket cylinder 13 and the first plate cylinder 11 And impression cylinder 1
5 are separated by a small distance.

In this state, when the cylinder rod 114 is extended by driving the air cylinder 113, 2
The first blanket cylinder 13 moves in the direction of the first plate cylinder 11 by the action of the link mechanism by the connecting plates 111, 112, etc., and the first blanket cylinder 13 is inserted into the first plate cylinder 11.

In this state, when the cylinder rod 124 is extended by driving the air cylinder 123, the first blanket cylinder 13 is moved by the action of the link mechanism constituted by the two connecting plates 121, 122 and the like. It moves in the direction of the impression cylinder 15, and is inserted into the impression cylinder 15.
At this time, since the rotating plate 116 also rotates counterclockwise about the shaft 115, the first blanket cylinder 13 moves not only in the direction of the impression cylinder 15 but also in the direction of the first plate cylinder 11.
Therefore, the state of the first blanket cylinder 13 being inserted into the first plate cylinder 11 is maintained.

When the eccentric member 119 is rotated, the shaft 120 of the eccentric member 119 moves slightly. For this reason,
The contact pressure between the impression cylinder 15 and the first plate cylinder 11 and the first blanket cylinder 13 is adjusted by rotating the worm wheel 125 connected to the eccentric member 119 by driving the motor 126 and finely moving the shaft 120. can do.
Therefore, the printing pressure at the time of printing using the first blanket cylinder 13 can be adjusted.

Referring to FIG. 1 again, the blanket cleaning device 29 disposed between the first and second blanket cylinders 13 and 14 moves from the unwinding roll to the winding roll via a plurality of pressure rollers. The cleaning liquid is supplied to a long cleaning cloth stuck on the path leading to the first and second blanket cylinders 13 and 14, and then the cleaning liquid is slid. , The surfaces of the second blanket cylinders 13 and 14 are cleaned. The cleaning cloth was applied to the impression cylinder 1
The surface of the impression cylinder 15 may also be cleaned by contacting the surface of the impression cylinder 5.

As described above, the impression cylinder 15 provided so as to be in contact with the first and second blanket cylinders 13 and 14 is provided with the first and second plate cylinders 11 and 12 and the first and second plate cylinders. It has a diameter [1/2] of the diameter of the blanket cylinders 13,14.
Further, the impression cylinder 15 has a gripper 83 for holding and transporting the leading end of the printing paper S. As the printing paper S passes between the impression cylinder 15 and the first and second blanket cylinders 13 and 14, ink is transferred to the surface thereof,
Printing is performed.

The paper feed cylinder 16 disposed adjacent to the impression cylinder 15 has the same diameter as the impression cylinder 15. The paper feed cylinder 16 holds the leading end of the printing paper S supplied one by one from the paper feed unit 27 by the reciprocating suction plate 131 to the gripper 8.
4 and transported. When the printing paper S is transferred from the paper feed cylinder 16 to the impression cylinder 15, the leading end of the printing paper S held by the gripper 84 is gripped by the gripper 83 of the impression cylinder 15.
Is held by

The paper discharge cylinder 17 disposed adjacent to the impression cylinder 15 has the same diameter as the impression cylinder 15. The paper discharge cylinder 17 has a structure in which a pair of chains 19 are wound around both ends thereof. Grippers 85 are disposed on three connecting members (not shown) that connect the pair of chains 19. I have. The leading end of the printing paper S held by the gripper 83 of the printing drum 15 is used to transfer the printing paper S from the printing drum 15 to the paper discharging cylinder 17.
5 is held. Then, the printing paper S is conveyed onto the paper discharge unit 28 as the chain 19 moves and is discharged.

Further, the reversing cylinder 18 disposed below the impression cylinder 15 has the same diameter as the impression cylinder 15. The reversing cylinder 18 is used for performing the reverse of the printing paper S when performing double-sided printing on the printing paper S.

As shown in FIG. 11, the reversing cylinder 18
The gripper 86 rotates while holding the rear end of the printing paper S held on the outer peripheral portion of the paper discharge cylinder 17, and receives the printing paper S held by the gripper 86 from the gripper 86, rotates the printing paper S, and rotates the printing paper S. And a gripper 87 which passes the rear end of the paper S to the gripper 84 of the paper feed cylinder 16 with the rear end as the leading end. These grippers 86 and 87 are provided in the longitudinal direction of the reversing cylinder 18 (FIG. 11).
In the direction perpendicular to the plane of the drawing) are arranged at different positions that do not interfere with each other.

The gripper 86 and the pedestal 1 of the gripper 86
51 is supported by a gear 153 rotatable about a shaft 152 provided on the reversing cylinder 18. This gear 153
, A gear 159 is arranged concentrically. The gripper 87 and the pedestal 154 of the gripper 87 are provided with a gear 1 rotatable about a shaft 155 provided on the reversing cylinder 18.
56 supported. The gears 153 and 156 mesh with each other.

Further, the substantially L-shaped arm 157 is
8 is provided so as to be able to swing around a shaft 158 provided on the same. One end of the arm 157 has a rack surface 161.
Are formed. The rack surface 161 meshes with the gear 159. Further, at the other end of the arm 157, a cam follower 162 which is in contact with a cam (not shown) is provided.

Therefore, the cam follower 162 abuts on a cam (not shown) and swings, whereby the gripper 8 is rotated.
6, 87 rotate about the axis of shafts 152 and 155 as a center of rotation. Then, when the grippers 86 and 87 move to the positions indicated by the two-dot chain lines in FIG. 11, the transfer of the printing paper S from the gripper 86 to the gripper 87 is executed as described later.

The grippers 83, 84, and 8 described above are used.
Reference numerals 5, 86, and 87 execute opening and closing operations thereof by cam mechanisms (not shown). At this time, depending on whether to perform double-sided printing or single-sided printing on the printing paper S, each gripper 83,
It is necessary to change the opening / closing operation of 84, 85, 86, 87. Similarly, whether to perform the transfer operation by the grippers 86 and 87 needs to be changed depending on whether to perform double-sided printing or single-sided printing on the printing paper S. These operations are changed by a command from the control unit 140 described later, the cam followers provided on the grippers 83, 84, 85, 86, and 87 and the cam followers 162 provided on the ends of the arms 157 abut. This is done by changing the shape of the cam.

The grippers 83, 84, 8
Instead of performing the opening / closing operation of 5, 86, 87 and the delivery operation by grippers 86, 87 by the above-described cam mechanism,
This may be performed using another actuator such as an air cylinder or a motor.

As described above, the paper feed cylinder 16, the discharge cylinder 17 and the reversing cylinder 18 use the printing cylinder to print the printing paper on which the first surface has been printed from the impression cylinder 15 when performing double-sided printing. After receiving and turning over the printing paper,
The printing paper reversing means for performing the reversing operation of the paper to be transferred to the impression cylinder 15 again is constituted.

Hereinafter, the operation of turning over the printing paper S will be described. 12 to 14 are explanatory views showing the operation of turning over the printing paper S by the printing paper reversing mechanism. In these figures, the impression cylinder 15,
Grippers 83 and 8 in the paper feed cylinder 16 and the paper discharge cylinder 17
4 and 85 are not shown.

The impression cylinder 15 and the first and second blanket cylinders 1
The leading end of the printing paper S that has passed between the printing papers 3 and 14 and has been printed is held by the gripper 85 of the paper discharge cylinder 17 as shown in FIG. Then, as shown in FIG. 12 (b), the printing paper S is
By moving with the chain 9, it is transported along the chain 19. The rear end of the printing paper S is the discharge cylinder 1
7 is held by the suction mechanism 163 provided on the sheet discharge drum 17 and is held on the surface of the paper discharge cylinder 17.

Subsequently, as shown in FIG. 13A, the rear end of the printing paper S is held by the gripper 86 of the reversing cylinder 18. Then, as shown in FIG.
8 rotates the printing paper S from the discharge cylinder 17 to the reverse cylinder 1
8 passed.

While the reversing cylinder 18 is rotating, the cam follower 162 of the arm 157 provided on the reversing cylinder 18 comes into contact with a cam (not shown), whereby the arm 157 swings. Accordingly, as shown in FIG.
6 and 87 rotate to transfer the printing paper S between them. Then, as shown in FIG.
Is further rotated, the printing paper S is held by the gripper 87 with the rear end thereof at the top, and is conveyed in the direction of the paper feed cylinder 16. This printing paper S is
As in the case of the printing paper S newly supplied from the paper supply unit 27, the printing paper S is supplied to the impression cylinder 15 via the paper supply cylinder 16.

As described above, the printing paper S is passed from the impression cylinder 15 to the discharge cylinder 17, the reversing cylinder 18 and the paper feeding cylinder 16 in order until it is transferred to the impression cylinder 15 again. Is performed.

The position of the printing paper S when the leading end of the printing paper S is separated from the outer periphery of the impression cylinder 15 is different from the position when the rear end of the printing paper S is held again by the outer periphery of the impression cylinder 15. The position of the printing paper S is delayed in phase by a distance twice the outer circumference of the impression cylinder 15. Therefore, the printing paper S is subjected to the first and second plate cylinders 1 in the impression cylinder 15 after performing the reverse operation.
Impression cylinder 15 whose phase is delayed by the same distance as the outer circumference of 1 and 12
Will be passed to the upper position.

Referring again to FIG. 1, the paper feed cylinder 16
The motor 133 is connected via a belt 132.
Then, the paper feed cylinder 16, the impression cylinder 15, the discharge cylinder 17, and the reversing cylinder 1
8, the first and second blanket cylinders 13 and 14 are respectively connected by gears attached to their ends. Furthermore, the first blanket cylinder 13 and the first plate cylinder 11 moved to the first printing position, and the second blanket cylinder 1
4 and the second plate cylinder 12 moved to the second printing position are connected to each other by a gear attached to an end thereof. Accordingly, these sheet feeding cylinders 1 are driven by the driving of the motor 133.
6, impression cylinder 15, discharge cylinder 17, reversing cylinder 18, first and second blanket cylinders 13, 14, first and second plate cylinders 11, 1
2 rotate in synchronization with each other.

The surfaces of the first and second blanket cylinders 13 and 14 are brought into contact with the first and second plate cylinders by the operation of the first and second blanket cylinders 13 and 14 shown in FIG. The first and second blanket cylinders 13 and 14 and the first and second plate cylinders 11 and 12 even when the cylinders 11 and 12 and the impression cylinder 15 are in an uncut state slightly separated from the surface thereof.
The gears attached to the ends of the impression cylinder 15 are engaged with each other within the range of the toothing, so that the rotational driving force can be transmitted.

FIG. 15 is a block diagram showing a main electrical configuration of the printing apparatus. This printing apparatus has a ROM 141 storing operation programs necessary for controlling the apparatus.
And a RAM 1 in which data and the like are temporarily stored during control.
And a control unit 140 including a CPU 143. The control unit 140 controls the ink supply device 20, the image recording device 25, the development processing device 26, the blanket cleaning device 29, the first and second plate cylinder moving mechanisms 31, 32, the first and the second via the interface 144. The driving unit in the mechanism for inserting the second blanket cylinders 13 and 14 and the like, and a driving circuit 145 for generating a driving signal for the motor 133 are connected. The printing apparatus is controlled by the control unit 140, and executes a plate making operation and a printing operation described later.

Further, as described above, the control section 140 also functions as control means for selectively operating the printing paper reversing means for performing the reversing operation of the printing paper S as necessary.

Next, plate making and printing operations by this printing apparatus will be described. FIG. 16 is a flowchart showing an outline of a plate making and printing operation by the printing apparatus.

First, a plate making process for recording an image on a printing plate on the first and second plate cylinders 11 and 12 and performing a developing process is executed (step S1). This plate making process is executed according to the process shown in the flowchart of FIG. 17 as a subroutine.

That is, first, the first plate cylinder 11 is
Is moved to the plate making position indicated by the two-dot chain line (step S11). The movement of the first plate cylinder 11 is executed by moving the slide holder 38 along the guide member 37 by driving the motor 39 shown in FIG.

Next, a printing plate is supplied to the outer periphery of the first plate cylinder 11 (step S12). The supply of this printing plate is shown in FIG.
The leading edge of the printing plate P pulled out of the magazine 52 is held by a holding claw 57 by a pair of guide rollers 53 shown in FIG. 5 and the rear end of the printing plate P cut by the cutter 54 is sucked and held by a suction device (not shown). Is executed by

Subsequently, an image is recorded on the printing plate held on the outer periphery of the first plate cylinder 11 (step S13). This image is recorded by rotating the first plate cylinder 11 at low speed by driving the motor 61 shown in FIG.
The process is performed by irradiating a modulated laser beam to the printing plate held on the outer periphery of the first to fifth printing plate cylinders 5 to 5.

Next, the printing plate on which the image has been recorded is developed (step S14). In this developing process, after the developing device 26 is raised to the developing position indicated by the two-dot chain line in FIG. 1, the developing unit, the stabilizing unit, and the washing unit are sequentially rotated on the first plate cylinder 11 rotating at a low speed. It is performed by contact.

When the developing process is completed, the first plate cylinder 1
1 is moved to a first printing position indicated by a solid line in FIG. 1 (step S15).

Subsequently, by the same operation as in steps S11 to S15, a plate making process for the printing plate held on the outer periphery of the second plate cylinder 12 is executed (steps S16 to S2).
0).

When the plate making on the printing plate held on the outer periphery of the first and second plate cylinders 11 and 12 is completed, the plate making process is completed.

Referring to FIG. 16 again, when the plate making process is completed, a printing process for printing on printing paper using the printing plates on first and second plate cylinders 11 and 12 is executed (step S).
2). The operation of the printing apparatus in this printing step will be described later in detail.

When the printing process is completed, the printing plate used for printing is discharged (step S3). In order to discharge the printing plate, first, the first plate cylinder 11 is moved to a plate making position indicated by a two-dot chain line in FIG. Then, the first plate cylinder 11 is rotated counterclockwise by the drive of the motor 61 shown in FIG. 4, and the end of the printing plate held on the first plate cylinder 11 is peeled off by the claws 63. The printing plate is guided by a conveying roller 65 and a guide member 66 and discharged onto a plate discharge tray 64. Then, after returning the first plate cylinder 11 to the first printing position, the second plate cylinder 12
Is moved from the second printing position to the plate making position, and the same operation as described above is executed, whereby the printing plate held on the second plate cylinder 12 is discharged onto the plate discharge tray 64.

When the printing plate discharging process is completed, the first and second blanket cylinders 13 and 14 are washed (step S).
4). At the time of cleaning the first and second blanket cylinders 13 and 14, the first and second blanket cylinders 13 and 14 are cleaned by the cylinder insertion mechanism shown in FIG.
The blanket cylinders 13 and 14 of the first and second plate cylinders 11,
After being separated from the impression cylinder 15 and the impression cylinder 15, the first and second blanket cylinders 13 and 14 are rotated. In this state, the cleaning cloth supplied with the cleaning liquid in the blanket cleaning device 29 is brought into contact with the surfaces of the first and second blankets 13 and 14 and then slid, thereby causing the first and second cleaning cloths to slide.
Of the blanket cylinders 13 and 14 of FIG.

When the cleaning of the first and second blanket cylinders 13 and 14 is completed, it is confirmed whether or not another printing work is to be performed (step S5). To perform another printing operation, the operations of steps 1 to 4 are repeated.

When the printing operation has been completed, the ink is washed (step S6). The cleaning of the ink is performed by removing and cleaning the ink adhered to the ink roller 68 and the ink fountain 69 in each ink supply device 20 by an ink cleaning device (not shown) provided in each ink supply device 20. .

When the ink washing step is completed, all the steps are completed.

In the printing apparatus according to the above-described embodiment, the first plate cylinder 11 is moved between the image recording position facing the image recording device 25 and the first printing position contacting the first blanket cylinder 13. First plate cylinder moving mechanism 3 for moving between plates
1 and a second plate cylinder moving mechanism 32 for moving the second plate cylinder 12 between the image recording position and a second printing position in contact with the second blanket cylinder 14, so that printing is performed. The image recording device 25 and the development processing device 26 used in the plate making process, the first and second blanket cylinders 13 and 14 used in the printing process, the ink supply device 20 or the dampening solution supply devices 21 and 22, Can be placed in separate locations that do not interfere with each other. For this reason, it is easy to secure a space for arranging them, and it is possible to improve the degree of freedom of the arrangement relationship. Further, since images can be recorded on the printing plates held by the first and second plate cylinders 11 and 12 using a single image recording device 25, the device can be simplified and the price of the entire device can be reduced. Can be reduced.

Next, the operation of the printing apparatus in the above-described printing process will be described. First, this printing device
A case where printing is performed on only one side of the printing paper will be described.

FIGS. 18 to 20 are explanatory views showing a printing operation of single-sided four-color printing in which printing is performed on one side of printing paper S using yellow, magenta, cyan, and black inks by this printing apparatus.

In FIGS. 18 to 20, the first plate cylinder 11 and the first blanket cylinder 13 are shown for convenience of explanation.
Of the first printing cylinder 11 and the first blanket cylinder 13 of the side used for magenta ink printing. M, the area C of the second plate cylinder 12 and the second blanket cylinder 14 on the side used for printing the cyan ink, and the second plate cylinder 1
Areas on the side of the second and second blanket cylinders 14 used for printing yellow ink are denoted by the letter Y.

In the plate making process prior to the printing process, the first
The printing plate P mounted on the outer peripheral portion of the plate cylinder 11 of FIG.
As shown in (a), an image area 67a for printing with black ink and an image area 67b for printing with magenta ink are recorded, and the outer peripheral portion of the second plate cylinder 12 is recorded. As shown in FIG. 5B, an image area 67c for printing with cyan ink and an image area 67d for printing with yellow ink are recorded on the printing plate P attached to the printing plate P. It is assumed that Also, black ink is supplied to the ink supply device 20a, magenta ink is supplied to the ink supply device 20b, and
Cyan ink is supplied to 0c, and yellow ink is supplied to the ink supply device 20d.

Further, in the ink supply devices 20a and 20c, the bearing 74 shown in FIG. 8 is arranged at the third position, and in the ink supply devices 20b and 20d, the bearing 74 is arranged at the second position. In the image area 67a of the printing plate P shown in FIG. 5, black ink is supplied from the ink supply device 20a, the image region 67b is supplied with magenta ink from the ink supply device 20b, and the image region 67c is supplied with cyan ink from the ink supply device 20c. However, the yellow ink is supplied to the image area 67d from the ink supply device 20d.

First, the first and second blanket cylinders 13 and 14 are moved to the impression cylinder 1 by the operation of the cylinder inserting mechanism shown in FIG.
5, the body is in a state of being pulled out. In this state, the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14 are rotated. At this time, the impression cylinder 15, the paper supply cylinder 16, the paper discharge cylinder 17, and the reversing cylinder 18 also rotate in synchronization.

In this state, each dampening water supply device 2
1 and 22 are brought into contact with the printing plates held on the first and second plate cylinders 11 and 12, respectively. Further, each ink supply device 20 is brought into contact only with a corresponding image area of the printing plate held on the first and second plate cylinders 11 and 12. As a result, dampening water is supplied to each of the image regions 67a, 67b, 67c, and 67d, and the image region 67a is supplied from the ink supply device 20a, and
b, black, magenta, cyan, and yellow inks are respectively supplied from the ink supply device 20c to the image region 67c and from the ink supply device 20d to the image region 67d. Then, this ink is transferred to corresponding areas of the first and second blanket cylinders 13 and 14.

By repeating this operation, ink is supplied to the printing plates on the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14. This ink supply operation is repeatedly performed until the printing process is completed.

When the ink supply to the printing plate on the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14 is completed, as shown in FIG. The printing paper S is supplied to the paper feeding cylinder 16, and the leading end of the printing paper S is held by the gripper 84 of the paper feeding cylinder 16. This printing paper S
Is transferred from the gripper 84 of the paper feed cylinder 16 to the gripper 83 of the impression cylinder 15.

Then, the impression cylinder 15 is further rotated, and the impression cylinder 1 is rotated.
When the leading end of the printing paper S held on the outer periphery of the first blanket 5 moves to a position facing the first blanket cylinder 13, the first blanket cylinder 1 is moved by the operation of the cylinder inserting mechanism shown in FIG.
3 is set in a cylinder-inserting state in which it comes into contact with the impression cylinder 15. In this state, as shown in FIG. 18B, the leading end of the printing paper S comes into contact with the end of the region on the surface of the first blanket cylinder 13 on the side used for printing black ink. The first blanket cylinder 13 has an area on the surface used for printing black ink on the surface thereof.
Area 67a in the printing plate held by plate cylinder 11
Has been transferred to black ink. Therefore, the first blanket cylinder 13 and the impression cylinder 15 are further rotated, so that the black ink is transferred to the printing paper S.

When the impression cylinder 15 further rotates and the leading end of the printing paper S held on the outer periphery of the impression cylinder 15 moves to a position facing the second blanket cylinder 14, the operation of the cylinder insertion mechanism shown in FIG. As a result, the second blanket cylinder 14 is brought into the cylinder insertion state in which the second blanket cylinder 14 comes into contact with the impression cylinder 15. In this state, as shown in FIG. 19A, the leading end of the printing paper S comes into contact with the end of the area of the surface of the second blanket cylinder 14 on the side used for printing the cyan ink. The area of the surface of the second blanket cylinder 14 on the side used for printing cyan ink is provided with the second plate cylinder 1.
The cyan ink has been transferred from the image area 67c in the printing plate held in No. 2. Therefore, when the second blanket cylinder 14 and the impression cylinder 15 are further rotated, cyan ink is further transferred to the printing paper S on which black ink has already been transferred.

In this state, the impression cylinder 15 is
Continue rotating with the blanket cylinders 13 and 14 of
As shown in FIG. 19B, the printing paper S is completely wound around the outer periphery of the impression cylinder 15. And the impression cylinder 15
Has a diameter of [1/2] of the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14, so that the printing wound around the outer periphery of the impression cylinder 15 Paper S is
In the second rotation, the surface of the first blanket cylinder 13 comes into contact with an area on the side used for printing magenta ink. Then, magenta ink is transferred from an image area 67b of the printing plate held by the first plate cylinder 11 to a region on the surface of the first blanket cylinder 13 which is used for printing magenta ink. . Therefore, as the first blanket cylinder 13 and the impression cylinder 15 further rotate, the magenta ink is further transferred to the printing paper S on which the black and cyan inks have already been transferred.

When the impression cylinder 15 further rotates, the printing paper S comes into contact with the end of the area on the surface of the second blanket cylinder 14 on the side used for printing the yellow ink. In the area on the surface of the second blanket cylinder 14 that is used for printing the yellow ink,
Image area 6 on printing plate held by second plate cylinder 12
The yellow ink is transferred from 7d. For this reason, the second blanket cylinder 14 and the impression cylinder 15 are further rotated, so that the yellow ink is further transferred to the printing paper S on which the black, cyan and magenta inks have already been transferred, and the four-color printing is performed. Is completed.

As shown in FIG. 20A, the leading end of the printing paper on which the printing of four colors has been completed is gripped by the gripper 8 of the impression cylinder 15.
From 3 is passed to the gripper 85 of the paper discharge cylinder 17. After the printing paper S to be printed next is supplied to the paper feed cylinder 16, it is transferred from the gripper 84 of the paper feed cylinder 16 to the gripper 83 of the impression cylinder 15.

The printing paper S on which printing of four colors has been completed
As shown in FIG. 20B, by driving the pair of chains 19, the paper is conveyed to the discharge unit 28 together with the gripper 85 of the discharge cylinder 17 and discharged.

As described above, in this printing apparatus, the impression cylinder 15 has a diameter [1/1] of the diameter of the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14.
2], the first and second plate cylinders 11,
12 and the first and second blanket cylinders 13 and 14 are 1
During rotation, the impression cylinder 15 makes two rotations. And the impression cylinder 15
Is rotated twice, printing of four colors of yellow, magenta, cyan, and black is performed on the printing paper S held on the outer peripheral portion of the impression cylinder 15. For this reason, by supplying new printing paper S from the paper feed cylinder 16 every time the impression cylinder 15 rotates twice, it is possible to continuously execute printing of four colors.

In this printing apparatus, when performing one-sided printing as described above, one-sided four-color printing in which printing is performed on one side of printing paper S with four colors of ink is used. It is also possible to carry out printing with the above ink.

For example, when printing is performed on only one side of printing paper with black ink only, the same image is formed in the image areas 67a and 67b of the printing plate held by the first plate cylinder 11. Then, in the ink supply device 20a, the bearing 74 shown in FIG. 8 is arranged at the first position. In addition, the other ink supply devices 20b, 20c, 2
Od is separated from the first and second plate cylinders 11 and 12.

In this state, a new print sheet S is supplied from the paper feed cylinder 16 every time the impression cylinder 15 makes one rotation. Thus, every time the impression cylinder 15 makes one rotation, an image of black ink from the image area 67a or 67b where the same image is formed is transferred to the printing paper S held on the outer periphery of the impression cylinder 15, Single-sided single-color printing can be performed.

In this case, the second plate cylinder 1
The second and second blanket cylinders 14 are not used. Accordingly, the second blanket cylinder 14 may be set in the cylinder-extracted state by the cylinder insertion mechanism shown in FIG. Further, during printing using the first plate cylinder 11 and the first blanket cylinder 13, the second plate cylinder 12 is moved to the image recording position, and the second plate cylinder 12 is moved to the image recording position. The plate making process may be performed on the above.

When two-color printing is performed on one side of the printing paper with cyan and magenta inks, the image area 67a of the printing plate held by the first plate cylinder 11 is used.
The same image to be printed with magenta ink is formed on each of 67b. The same image to be printed with cyan ink is formed in each of the image areas 67c and 67d on the printing plate held by the second plate cylinder 12. Then, in the ink supply devices 20b and 20c, the bearing 74 shown in FIG. 8 is arranged at the first position. The ink supply devices 20a and 20d are provided with the first and second plate cylinders 1 respectively.
Separate from 1 and 12.

In this state, a new print sheet S is supplied from the paper feed cylinder 16 every time the impression cylinder 15 makes one rotation. Thus, every time the impression cylinder 15 makes one rotation, an image formed of magenta ink from the image area 67a or 67b where the same image is formed on the printing paper S held on the outer periphery of the impression cylinder 15 and the same Image region 67c in which the image of
Alternatively, images of cyan ink from 67d are sequentially transferred, and single-sided two-color printing can be performed.

[0126] Even in the single-sided two-color printing described above, when two-color printing is performed using black and magenta inks, new printing paper S is supplied every time the impression cylinder makes two rotations. There is a need. That is, in this case, an image to be printed with black ink on the image area 67a of the printing plate held by the first plate cylinder 11, and an image to be printed with magenta ink on the image area 67b. To form Then, the bearing 74 shown in FIG. 8 is arranged at the third position in the ink supply device 20a and at the second position in the ink supply device 20b. Also, the ink supply devices 20c and 20d
Is separated from the second plate cylinder 12.

In this state, a new print sheet S is supplied from the paper feed cylinder 16 every time the impression cylinder 15 rotates twice. Thus, every time the impression cylinder 15 makes one rotation, the image of the black and magenta inks from the image areas 67a and 67b is transferred to the printing paper S held on the outer circumference of the impression cylinder 15, and the one-sided two-color printing is performed. It can be carried out.

In this case as well, the second plate cylinder 1
The second and second blanket cylinders 14 are not used. Accordingly, the second blanket cylinder 14 may be set in the cylinder-extracted state by the cylinder insertion mechanism shown in FIG. Further, during printing using the first plate cylinder 11 and the first blanket cylinder 13, the second plate cylinder 12 is moved to the image recording position, and the second plate cylinder 12 is moved to the image recording position. The plate making process may be performed on the above.

Further, when printing is performed on one side of the printing paper with three color inks of yellow, magenta, and cyan, the image area 67b of the printing plate held by the first plate cylinder 11 is printed with magenta ink. Is formed, and an image to be printed with cyan and yellow inks is formed on an image area 67c of the printing plate held by the second plate cylinder 12 in 67d. And the bearing 74 shown in FIG. 8 is arrange | positioned in the 3rd position in the ink supply apparatus 20c, and the 2nd position in the ink supply apparatuses 20b and 20d. In addition, the ink supply device 20a is separated from the first plate cylinder 11.

In this state, a new print sheet S is supplied from the paper feed cylinder 16 every time the impression cylinder 15 rotates twice. Thus, every time the impression cylinder 15 rotates twice, the image areas 67b, 67c, and 6 are printed on the printing paper S held on the outer periphery of the impression cylinder 15.
An image with magenta, cyan and yellow inks from 7d is transferred, and one-sided three-color printing can be performed.

Next, a case where printing is performed on both sides of the printing paper S by the printing apparatus will be described.

FIGS. 21 to 25 show that this printing apparatus
FIG. 4 is an explanatory diagram illustrating a printing operation of two-sided two-color printing in which printing is performed using two colors of cyan and magenta inks on the front surface and the back surface of a printing paper S.

In FIGS. 18 to 20, the first plate cylinder 11 and the first blanket cylinder 13 are shown for convenience of explanation.
Area on the side used for printing on the surface of the printing paper S with magenta ink (hereinafter referred to as “M1 area”)
), And a region on the side of the first plate cylinder 11 and the first blanket cylinder 13 that is used for printing on the back surface of the printing paper S with magenta ink (hereinafter, referred to as “M1”). M2 area ”). Further, of the second plate cylinder 12 and the second blanket cylinder 14, a region (hereinafter referred to as a “C1 region”) on a side used for performing printing with cyan ink on the surface of the printing paper S is shown. C1 is denoted by C1, and an area on the side used for printing on the back surface of the printing paper S with cyan ink (hereinafter referred to as “C2 area”) is denoted by C2.

In the plate making process prior to the printing process, the first
The printing plate P mounted on the outer peripheral portion of the plate cylinder 11 of FIG.
As shown in (a), an image region 67a for printing on the front surface of the printing paper S with magenta ink and an image region 67b for printing on the back surface of the printing paper S with magenta ink are provided. As shown in FIG. 5B, on the printing plate P which has been recorded and is mounted on the outer peripheral portion of the second plate cylinder 12, the printing plate P is for printing on the surface of the printing paper S with cyan ink. It is assumed that an image area 67c and an image area 67d for printing on the back surface of the printing paper S with cyan ink are recorded. As in the case of single-sided four-color printing, magenta ink is supplied to the ink supply device 20b and cyan ink is supplied to the ink supply device 20c.

Further, the ink supply devices 20b and 20b
In c, the bearing 74 shown in FIG. 8 is arranged at the first position. In addition, the ink supply devices 20a and 20d
By oscillating the side plate 72 about the shaft 71 by a drive source (not shown), the side plate 72 is retracted in a direction away from the first and second plate cylinders 11 and 12. Thus, magenta ink is supplied from the ink supply device 20b to the image regions 67a and 67b, and cyan ink is supplied from the ink supply device 20c to the image regions 67c and 67d.

First, the first and second blanket cylinders 13 and 14 are moved by the operation of the cylinder inserting mechanism shown in FIG.
5, the body is in a state of being pulled out. In this state, the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14 are rotated. At this time, the impression cylinder 15, the paper supply cylinder 16, the paper discharge cylinder 17, and the reversing cylinder 18 also rotate in synchronization.

In this state, each dampening water supply device 2
1 and 22 are brought into contact with the printing plates held on the first and second plate cylinders 11 and 12, respectively. In addition, the ink supply devices 20b, 2
0c is brought into contact with the printing plate held on the first and second plate cylinders 11,12. Thereby, each image area 67a, 67
While b, 67c and 67d are supplied with dampening water,
The image regions 67a and 67b are supplied with magenta ink from the ink supply device 20b, and the image regions 67c and 67d are supplied with cyan ink from the ink supply device 20c. Then, this ink is transferred to corresponding areas of the first and second blanket cylinders 13 and 14.

By repeating this operation, ink is supplied to the printing plates on the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14. This ink supply operation is repeatedly performed until the printing process is completed.

When the ink supply to the printing plates on the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14 is completed, as shown in FIG. The printing paper S is supplied to the paper feeding cylinder 16, and the leading end of the printing paper S is held by the gripper 84 of the paper feeding cylinder 16. This printing paper S
Is transferred from the gripper 84 of the paper feed cylinder 16 to the gripper 83 of the impression cylinder 15.

Then, the impression cylinder 15 is further rotated, and the impression cylinder 1 is rotated.
When the leading end of the printing paper S held on the outer periphery of the first blanket 5 moves to a position facing the first blanket cylinder 13, the first blanket cylinder 1 is moved by the operation of the cylinder inserting mechanism shown in FIG.
3 is set in a cylinder-inserting state in which it comes into contact with the impression cylinder 15. In this state, as shown in FIG. 21B, the leading end of the surface of the printing paper S comes into contact with the end of the first blanket cylinder 13 at M1. And in this M1 area,
Image area 6 in printing plate held by first plate cylinder 11
Magenta ink is transferred from 7a. Therefore, the first blanket cylinder 13 and the impression cylinder 15 are further rotated, so that magenta ink is transferred to the surface of the printing paper S.

When the impression cylinder 15 further rotates and the leading end of the printing paper S held on the outer periphery of the impression cylinder 15 moves to a position facing the second blanket cylinder 14, the operation of the cylinder insertion mechanism shown in FIG. As a result, the second blanket cylinder 14 is brought into the cylinder insertion state in which the second blanket cylinder 14 comes into contact with the impression cylinder 15. In this state, as shown in FIG. 22A, the leading end of the printing paper S comes into contact with the end of the second blanket cylinder 14 in the C1 region. The second plate cylinder 1 is located in the area C1.
The cyan ink has been transferred from the image area 67c in the printing plate held in No. 2. For this reason, when the second blanket cylinder 14 and the impression cylinder 15 further rotate, cyan ink is further transferred to the surface of the printing paper S on which magenta ink has already been transferred. In parallel with this, the second printing paper S is supplied to the paper feeding cylinder 16, and the leading end of the printing paper S is held by the gripper 84 of the paper feeding cylinder 16. This second printing paper S is the first printing paper S
Similarly, the paper is transferred from the gripper 84 of the paper feed cylinder 16 to the gripper 83 of the impression cylinder 15.

In this state, the impression cylinder 15 is
Continue rotating with the blanket cylinders 13 and 14 of
As shown in FIG. 22B, the first printing paper S is transferred from the gripper 83 of the impression cylinder 15 to the gripper 85 of the paper discharge cylinder 17 and then conveyed along a pair of chains 19. In parallel with this, the surface of the second printing paper S is M2
Contact the area. Here, since the second printing paper S comes into contact with the M2 area where printing should be originally performed on the back side, the image of the image area 67b to be printed on the back side is printed on the front side. Therefore, the second printing paper S is discarded later.

The impression cylinder 15 is the first and second blanket cylinder 1
When the rotation is further continued together with 3 and 14, FIG.
As shown in (2), the surface of the second printing paper S is in contact with the area C2. In parallel with this, the third printing paper S
Is supplied to the paper feed cylinder 16, and the leading end of the printing paper S is held by the gripper 84 of the paper feed cylinder 16.

When the impression cylinder 15 is further rotated, as shown in FIG. 23B, the rear end of the first printing paper S conveyed along the pair of chains 19 becomes the reversing cylinder 1
8 is held by the gripper 86. Then, the rear end of the first print sheet S is transferred from the gripper 86 to the gripper 87 by the operations shown in FIGS. In parallel with this, the third printing paper S is fed to the paper feed cylinder 1
6 to the gripper 83 of the impression cylinder 15.

When the impression cylinder 15 is further rotated, the first printing paper S is conveyed in the direction of the paper supply cylinder 16 by the gripper 87 of the reversing cylinder 18 as shown in FIG. In parallel with this, the second printing paper S is held by the gripper 85 of the paper discharge cylinder 17 and a pair of chains 19
Conveyed along. Further, the front end of the surface of the third printing paper S is the M1 in the first blanket cylinder 13.
Abuts the edge of the area. Then, as the first blanket cylinder 13 and the impression cylinder 15 further rotate, magenta ink is transferred to the surface of the third printing paper S.

When the impression cylinder 15 is further rotated, FIG.
As shown in (b), the first printing paper S is the paper feed cylinder 16
The gripper 84 is transported with its tip held. Then, the leading end of the first printing paper S is transferred from the gripper 84 of the paper feed cylinder 16 to the gripper 83 of the impression cylinder 15.
As a result, the first printing sheet S for which printing on the front side has been completed
Is supplied to the impression cylinder 15 again with its rear end at the top after performing the inversion. At this time, as described above, the printing paper S is placed on the impression cylinder 15 in the first and second positions.
Is transferred to a position where the phase is delayed by the same distance as the outer circumferences of the plate cylinders 11 and 12. For this reason, the phase of the printing paper S is shifted,
The back surface of the printing paper S abuts on the M2 area of the first blanket cylinder 13. Therefore, the surface first
It is possible to prevent the back surface of the printing paper S that has come into contact with one area from coming into contact with the M1 area again.

At this time, as described above, the printing paper S
Is transported to a position on the impression cylinder 15 which is delayed by the same distance as the outer circumferences of the first and second plate cylinders 11 and 12.
In other words, from another viewpoint, the printing paper S is returned to the impression cylinder 15 which has been rotated twice after the printing has been performed on the front surface thereof, and the printing paper S has been printed by the impression cylinder 15 at the third rotation counted from the printing on the front surface. Printing on the back side is performed. That is, the rear end of the printing paper S is moved on the discharge cylinder 17, the reversing cylinder 18 and the paper supply cylinder 16 at the same speed as the outer circumference of the impression cylinder 15 at the same speed as the first and second plate cylinders 11, 1
This is realized by extra transport by a distance obtained by subtracting the length of the printing paper S from the outer peripheral length of the print paper S. In this printing apparatus, the transport path of the printing paper S is set to an integral multiple of the length of the printing paper S, so that the inverted printing paper S can be easily returned to an appropriate position.

In the state shown in FIG.
The leading end of the second printing paper S is held by the gripper 85 of the paper discharge cylinder 17, and is conveyed along the pair of chains 19. Further, the third printing paper S comes into contact with the C1 area in the second blanket cylinder 14. This allows
Third printing paper S on which magenta ink has already been transferred
The cyan ink is transferred to the surface of.

When the impression cylinder 15 is further rotated, FIG.
As shown in (a), the leading end of the back surface of the first printing paper S abuts on the end of M2 in the first blanket cylinder 13. Then, magenta ink is transferred to the M2 region from the image region 67b of the printing plate held by the first plate cylinder 11. For this reason, when the first blanket cylinder 13 and the impression cylinder 15 further rotate, magenta ink is transferred to the back surface of the printing paper S. The second printing paper S on which the images of the image areas 67b and 67d which should be printed on the back side are printed on the front side, without the printing on the back side.
Emitted to 8 and discarded.

When the impression cylinder 15 is further rotated, FIG.
As shown in (b), the leading end on the back surface of the first printing paper S abuts on the end of the second blanket cylinder 14 in the C2 region. The C2 region includes the second
Area 67d in the printing plate held by plate cylinder 12 of FIG.
Is transferred from the ink. Therefore, the second
Is further rotated, cyan ink is transferred to the back surface of the printing paper S on which magenta ink has already been transferred. As a result, both sides of the first printing paper S are printed with magenta and cyan inks.
The first printing paper S on which the two-sided two-color printing is completed is held by the gripper 85 of the paper discharge cylinder 17, is conveyed along the pair of chains 19, and is discharged to the paper discharge unit 28.

In the state shown in FIG.
The third printing paper S having magenta and cyan inks transferred to its surface is conveyed along a pair of chains 19 with its leading end held by a gripper 85 of the paper discharge cylinder 17. This third printing paper S is subjected to the same process as the first printing paper S described above, and magenta and cyan inks are also transferred to the back surface, thereby performing two-sided two-color printing. .

Further, in the state shown in FIG. 25B, the fourth printing paper S is supplied to the paper feed cylinder 16. This four-sided printing paper S is also subjected to two-sided two-color printing in the same process as the first and third printing papers S.

As described above, in this printing apparatus, the impression cylinder 15 has a diameter [1/1] of the diameter of the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14.
2], the first and second plate cylinders 11,
12 and the first and second blanket cylinders 13 and 14 are 1
During rotation, the impression cylinder 15 makes two rotations. And the impression cylinder 15
During the two rotations of the printing paper S, two printing papers S are held on the outer peripheral portion of the impression cylinder 15 alternately with the front and back facing outward.
Color printing is performed. For this reason, by supplying new printing paper S from the paper feed cylinder 16 every time the impression cylinder 15 rotates twice, it is possible to continuously perform two-sided two-color printing.

In particular, the two colors on each surface are not fixed. For example, as in the above-described embodiment, each ink supply device 20 is provided on any of the printing plates held by the first and second plate cylinders 11 and 12. If ink can be supplied to the image areas 67a, 67b, 67c, 67d, one color from black or magenta and one color from cyan or yellow can be selected and printed.

When performing the above-described two-sided printing in this printing apparatus, one-color printing is performed on both sides of the printing paper S instead of two-sided two-color printing in which printing is performed on both sides of the printing paper S with two colors of ink. It is also possible to perform double-sided single-color printing, which performs printing with ink, or single-sided, two-color, single-sided printing in which printing is performed with two colors of ink on one side of printing paper and one color of ink on the other side. .

In this case, the image areas 67a, 67
Only necessary image areas are created among 7b, 67c and 67d. In addition, the ink supply device 20 supplies ink to the corresponding regions among the created image regions 67a, 67b, 67c, and 67d. By performing the same operation as the above-described two-sided two-color printing, two-sided single-color printing or one-sided two-color one-sided single-color printing can be performed.

For example, in the case where printing is performed with magenta ink on the front surface of the printing paper S and printing is performed with cyan ink on the back surface, an image for printing with magenta ink is created in the image area 67a. An image for printing with cyan ink is created in the image area 67d. Also,
The bearing 74 shown in FIG. 8 is arranged at the third position in the ink supply device 20b, and is arranged at the second position in the ink supply device 20c. Further, the ink supply devices 20a and 20d are separated from the first and second plate cylinders 11 and 12, respectively. By supplying new printing paper S from the paper feed cylinder 16 every time the impression cylinder 15 rotates twice,
It is possible to continuously perform printing for transferring the magenta and cyan images on the front and back of the printing paper S.

In the case where printing is performed on both sides of the printing paper s with black ink, an image to be printed on the surface of the printing paper S is formed in the image area 67a of the printing plate held by the first plate cylinder 11. Is created, and an image to be printed on the back surface of the printing paper S is created in the image area 67b. Further, the bearing 74 shown in FIG.
In a, it is arranged at the first position. Further, the ink supply devices 20b, 20c and 20d are provided with the first and second plate cylinders 1 respectively.
Separate from 1 and 12. Then, by supplying new printing paper S from the paper feeding cylinder 16 every time the impression cylinder 15 rotates twice, it is possible to continuously execute printing for transferring a black image on both sides of the printing paper S. .

In the case where only one of the first and second blanket cylinders 13 and 14 is used, for example, when printing is performed on both sides of the printing paper S with the same color ink as described above. , The other blanket cylinder
The body can be pulled out by the body insertion mechanism shown in FIG. Further, while printing is performed using one plate cylinder and a blanket cylinder, the other plate cylinder may be moved to an image recording position, and the plate making process may be performed on the plate cylinder at this position. .

In the printing apparatus described above, the first and second
Each of the printing plates held on the plate cylinders 11 and 12 has two image areas 67a, 67b and 67c and 67d, and the first and second plate cylinders 11 and 12 and the first and second plate cylinders.
Although the impression cylinder 15 having a diameter of [1/2] of the diameter of the blanket cylinders 13 and 14 is used, the present invention is not limited to such a form.

For example, when n and m are natural numbers,
When the number of image areas formed on the first and second plate cylinders is [2n], the diameter of the impression cylinder is set to the diameter of the first and second plate cylinders and the diameter of the first and second blanket cylinders. [(2m-1) / 2
n] times. Thereby, the impression cylinder rotates [2n] while the first and second plate cylinders and the first and second blanket cylinders rotate [2m-1]. Then, [2n] and [2m-
[1] and [2m-1] printing paper S held on the outer circumference of the impression cylinder,
During the [n] rotation, the [2n] images formed on the first and second plate cylinders are transferred once each. Therefore, printing of [4n] color on one side of the printing paper S or printing of [2n] color on both sides of the printing paper S can be executed.

FIG. 26 is an explanatory diagram illustrating the configuration of a printing apparatus according to such an embodiment. In FIG. 26, the impression cylinder 215 and the first and second plate cylinders 11 and 12 similar to the printing apparatus shown in FIG.
And first and second blanket cylinders 13 and 14 are shown. Other configurations are the same as those of the printing apparatus shown in FIG. 1 described above.

In this printing apparatus, the natural number n is set to 1 and m is set to 2. That is, in this printing apparatus, the diameter of the impression cylinder 215 is different from that of the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 1.
4 is 3/2 times the diameter. For this reason, in this printing apparatus, while the impression cylinder 215 makes two rotations, the first,
The second plate cylinders 11, 12 and the first and second blanket cylinders 13, 14 make three rotations. Further, three grippers 83 are arranged at equal intervals on the outer peripheral portion of the impression cylinder 215, so that three printing papers S can be held.

When performing single-sided, four-color printing in this printing apparatus, when the impression cylinder 215 makes two rotations while holding three printing papers S, the three printing papers S become yellow, magenta, cyan, and black. Are printed. For this reason, by supplying three new printing papers S from the paper feed cylinder 16 every time the impression cylinder 215 makes two rotations, it is possible to continuously execute printing of four colors.

In this printing apparatus, for example, when printing is performed with magenta and cyan inks on the front side of printing paper S and printing is performed with black and yellow inks on the back side, the same as the printing apparatus shown in FIG. Of the printing paper S is used. Then, the printing paper S, the printing of which has been completed with magenta and cyan inks, is received from the impression cylinder 215, and after the printing paper S is turned over, the printing paper S is transferred to the first and second printing cylinders 215 on the impression cylinder 215. Plate cylinder 11, 1
2 is passed to a position where the phase is delayed by a distance that is an integral multiple of the outer circumference of 2.
At this time, 2 (ie, [2n]) and 3 (ie, [2n]
m-1]) is even and odd, so that the phase of the printing paper S is shifted, and the back surface of the printing paper S is printed with black and yellow inks.

At this time, as described above, the printing paper S
Is conveyed to a position on the impression cylinder 215 which is delayed by a distance that is an integral multiple of the outer circumference of the first and second plate cylinders 11 and 12. In other words, from another point of view, the printing paper S is positioned on the impression cylinder 215 at an integer multiple of 2 of the length of the printing paper S (ie, the first and second printing plates) from the position on the front surface where printing was performed. By being transported to a position delayed by a distance of an integer multiple of the number of image areas on the cylinders 11 and 12, the printing paper held by the impression cylinder 215 is increased to an integer multiple of 2 from the printing on the front side (ie, the impression paper 215). (The number of S's) and the first and second
In the printing by the plate cylinders 11 and 12, printing on the back surface is performed.

In this case, a phenomenon occurs in which black and yellow inks are printed on the surface of the second printing paper S before the first printing paper S has completed printing on both sides. . The printing paper S on which the front and back sides have been printed in this way is discarded as necessary.

Similarly, the diameters of the impression cylinders are changed to the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 1.
4 may be 5/2 times or 7/4 times the diameter. In the former case, the first and second plate cylinders 11 and
12 and the first and second blanket cylinders 13 and 14 are 5
The printing is performed in a single-sided, four-color or two-sided, two-color manner on the five printing sheets S held by rotating the impression cylinder. In the latter case, the first and second plate cylinders 1 are rotated while the impression cylinder rotates four times.
1, 12 and first and second blanket cylinders 13, 14
Is rotated seven times, and printing of eight colors on one side or four colors on both sides is performed on the seven printing sheets S held on the outer periphery of the impression cylinder.

When n and m are natural numbers, the number of image areas formed on the first and second plate cylinders is [2n + 1].
, The diameter of the impression cylinder is set to [2 m / (2n +) of the diameters of the first and second plate cylinders and the first and second blanket cylinders.
1)] times. Thus, the impression cylinder rotates [2n + 1] while the first and second plate cylinders and the first and second blanket cylinders rotate [2m]. Since [2n + 1] and [2m] have an odd-numbered and even-numbered relationship, [2m] printing paper S held on the outer periphery of the impression cylinder has an impression cylinder of [2n +
1] [2] formed on the first and second plate cylinders during rotation
[n + 1] images are transferred one by one. Therefore, printing of [2 (2n + 1)] colors on one side of the printing paper S or printing of [2n + 1] colors on both sides of the printing paper S can be executed.

FIG. 27 is an explanatory diagram illustrating the configuration of a printing apparatus according to such an embodiment. FIG. 27 illustrates an impression cylinder 216, first and second plate cylinders 211 and 212, and first and second blanket cylinders 213 and 214 in the configuration of the entire printing apparatus. Although not shown, the first and second plate cylinders 211 and 212 are not shown.
Outside, are provided three ink supply units each similar to the ink supply unit 20 shown in FIG. Other configurations are the same as those of the printing apparatus shown in FIG. 1 described above.

In this printing apparatus, the natural numbers n and m are both set to 1. That is, in this printing apparatus, the diameter of the impression cylinder 216 is different from that of the first and second plate cylinders 211 and 212 and the first and second blanket cylinders 21.
3, 2/3 times the diameter of 214. For this reason,
In this printing apparatus, the first and second plate cylinders 211 and 212 and the first and second plate cylinders 211 and 212 are rotated while the impression cylinder 216 rotates three times.
The blanket cylinders 213 and 214 rotate twice. Further, two grippers 83 are arranged at equal intervals on the outer peripheral portion of the impression cylinder 216, so that two printing papers S can be held.

To perform six-color printing on one side in this printing apparatus, when the impression cylinder 216 rotates three times while holding two printing papers S, the two printing papers S are printed on the two printing papers S with inks of 1 to 6 colors. Is performed using 6 colors. For this reason, by supplying two new sheets of printing paper S from the paper feed cylinder 16 every time the impression cylinder 216 rotates three times, it is possible to continuously execute printing of six colors. In addition to the normal four-color inks, it is conceivable that inks of other colors called spot colors are used, or a transparent varnish or the like is used.

In this printing apparatus, for example, any four colors of ink (for example,
When printing is performed with two colors out of one to three colors and two colors out of four to six colors (total of four colors), and printing is performed on the back surface with ink of two colors, FIG. 1 uses the same reversing means of the printing paper S as the printing apparatus. That is, the printing paper S, which has been printed with four colors of ink on the surface thereof by rotating the impression cylinder 216 twice, receives the printing paper S from the impression cylinder 216, and after performing the reverse of the printing paper S, the printing paper S The impression cylinder 216
Is transferred to a position delayed in phase by a distance that is an integral multiple of the outer circumference of the first and second plate cylinders 211 and 212 in FIG. At this time, 3
(Ie, [2n + 1]) and 2 (ie, [2m]) have an odd-numbered and even-numbered relationship, so that the phase of the printing paper S is shifted, and when the impression cylinder 216 is rotated once, two colors appear on the back surface of the printing paper S. Printing is performed with ink of the minute color. Note that two-color printing on the front side of the printing paper S and four-color printing on the back side are also possible.

At this time, as described above, the printing paper S
Is transported to a position on the impression cylinder 216 that is delayed by a distance that is an integral multiple of the outer circumference of the first and second plate cylinders 211 and 212. That is, from another point of view, the printing paper S is
On the impression cylinder 216, an integer multiple of 3 of the length of the printing paper S (that is, the first and second
(Integral multiple of the number of image areas in the plate cylinders 211 and 212)
Is moved to a position delayed by a distance of 2 to an integer multiple of 3 counted from the printing on the front surface (ie, the impression cylinder 216).
In the printing by the first and second plate cylinders 211 and 212 after the number obtained by adding the number of printing papers S held in the first and second printing drums, printing on the back surface is performed.

In this case, before the first sheet of printing paper S has been printed on both sides, printing should be performed on the front side of the second or third sheet of printing paper S and on the back side. The phenomenon that ink is printed and the phenomenon that printing is performed in a different printing order occur. As described above, the printing paper S on which the printing different from the normal printing is performed is discarded as necessary.

Similarly, the diameters of the impression cylinders are changed to the first and second plate cylinders 211 and 212 and the first and second blanket cylinders 21.
The diameter may be 4/3 times or 6/5 times the diameter of 3, 214.
In the former case, the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and
14 rotates four times, and printing of six colors on one side or a total of six colors on both sides is performed on four printing sheets S held on the outer peripheral portion of the impression cylinder. In the latter case, the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14 make six rotations while the impression cylinder makes five rotations. Printing of 10 colors on one side or a total of 10 colors on both sides is performed on the held six printing sheets S.

Here, in the above case, when the number of image areas on the plate cylinder is X and the number of printing papers held on the outer peripheral portion of the impression cylinder is Y, X and Y are relatively prime ( If it has no common divisor other than 1), it is possible to perform one side and both sides similarly to the above-described embodiments.

In this case, the printing paper S by the impression cylinder
Is assumed to continue, the printing paper S
, The images of all the printing plates on each plate cylinder are printed. Therefore, if the printing paper S can be instantly reversed without changing the holding position of the printing paper S on the impression cylinder, an image of a part of the printing plate on the plate cylinder is printed on one surface of the printing paper S, An image of another printing plate can be printed on the other side of the printing paper.

However, it is difficult to instantly reverse the printing paper S without changing the holding position of the printing paper S on the impression cylinder. For this reason, the printing paper S on which printing on one side is completed is returned from the position where the printing paper S is taken out from the impression cylinder to a position where the phase is delayed by a distance that is an integral multiple of the outer circumference of the plate cylinder.
As a result, the images of all the printing plates on each plate cylinder are printed on both sides of the printing paper S in the same order as when the printing paper S is instantly reversed at the same position on the impression cylinder. Become. At this time, printing on the back surface of the printing paper is printing (nX + Y) times counting from printing on the front surface.

In the embodiment shown in FIG. 26 and FIG. 27, as in the embodiment shown in FIG. 4 and FIG.
By recording a plurality of images at positions where the plurality of images are evenly distributed on one printing plate P held on the outer peripheral portions of the first and second plate cylinders 11, 12, 211 and 212, respectively. , The equipment has been simplified. However, as in the embodiment shown in FIG. 6, the first and second plate cylinders 11, 12, 21
By disposing a plurality of holding claws 57 on the first and second 212, respectively, the first and second plate cylinders 11, 12, 211 and 212 are provided.
May hold a plurality of printing plates P. Also in this case, the first and second plate cylinders 11 are arranged in such a manner that the plurality of printing plates P are evenly distributed so that the image areas of the respective printing plates P are uniformly distributed.
12, 211, and 212 need to be held.

[0181]

According to the first aspect of the present invention, printing of one to four colors on one side of printing paper and one or two colors of printing on both sides of printing paper can be performed without changing ink. Can be. At this time, since the impression cylinder can be used in common, it is possible to make the printing apparatus compact.

According to the second aspect of the present invention, the 1- [4n] color printing on one side of the printing paper and the 1- [2n] color printing on each side of the printing paper are executed without replacing the ink. can do. At this time, since the impression cylinder can be used in common, it is possible to make the printing apparatus compact.

According to the third aspect of the present invention, ink is exchanged between 1- [2 (2n + 1)] color printing on one side of printing paper and 1- [2n + 1] color printing on each side of printing paper. It can be performed without. At this time, since the impression cylinder can be used in common, it is possible to make the printing apparatus compact.

According to the fourth aspect of the present invention, the printing paper reversing means moves the printing paper, on which printing on the first surface has been completed, from the holding position of the first printing surface on the outer periphery of the impression cylinder to the first and second printing positions. Is transferred to a position where the phase is delayed by an integral multiple of the outer circumference of the plate cylinder, so that different images can be printed on both sides of the printing paper.

According to the fifth aspect of the present invention, the printing paper reversing means includes a reversing cylinder which rotates in one direction while holding the printing paper on which printing on the first surface has been completed, and completes printing on the first surface. Since the printing paper is reversed by holding the rear end of the printing paper on the reversing cylinder with the rear end as the head, the printing paper can be reversed by a simple mechanism.

According to the sixth aspect of the present invention, 1-X color printing on one side of printing paper and one side of printing paper on both sides are combined.
X-color printing can be performed without changing ink. At this time, since the impression cylinder can be used in common, it is possible to make the printing apparatus compact.

According to the seventh aspect of the present invention, the ink supply means can selectively contact any image area of the printing plate in the first and second plate cylinders. Printing can be performed by selecting an ink of an arbitrary color from the inks supplied from the respective ink supply units.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a printing apparatus according to the present invention.

FIG. 2 is a plan view of first and second plate cylinder moving mechanisms 31 and 32.

FIG. 3 is a side sectional view of a first plate cylinder moving mechanism 31;

FIG. 4 is a schematic side view showing the first plate cylinder 11 or the second plate cylinder 12 moved to an image recording position, together with a plate feeding unit 23 and a plate discharging unit 24.

FIG. 5 is an explanatory diagram showing an arrangement of image areas on a printing plate P;

FIG. 6 is a schematic diagram showing the first plate cylinder 11 or the second plate cylinder 12 moved to the image recording position, together with the plate supply unit 23 and the plate discharge unit 24.

FIG. 7 is a perspective view illustrating a configuration of an image recording device 25.

FIG. 8 is a schematic diagram showing a swing mechanism of the ink supply device 20.

FIG. 9 is a plan view of the cams 81 and 82. FIG.

FIG. 10 is a schematic view showing a mechanism for inserting the first blanket cylinder 11;

FIG. 11 is a schematic view showing a rotation mechanism of grippers 86 and 87 in the reversing cylinder 18.

FIG. 12 is an explanatory diagram showing the operation of turning over the printing paper S by the printing paper reversing mechanism.

FIG. 13 is an explanatory diagram showing the operation of turning over the printing paper S by the printing paper reversing mechanism.

FIG. 14 is an explanatory diagram showing the operation of turning over the printing paper S by the printing paper reversing mechanism.

FIG. 15 is a block diagram illustrating a main electrical configuration of the printing apparatus.

FIG. 16 is a flowchart illustrating an outline of plate making and printing operations performed by the printing apparatus.

FIG. 17 is a flowchart showing a plate making process.

FIG. 18 is an explanatory diagram illustrating a printing operation of the printing apparatus when performing single-sided four-color printing.

FIG. 19 is an explanatory diagram illustrating a printing operation of the printing apparatus when performing single-sided four-color printing.

FIG. 20 is an explanatory diagram illustrating a printing operation of the printing apparatus when performing single-sided four-color printing.

FIG. 21 is an explanatory diagram illustrating a printing operation of the printing apparatus when performing two-sided two-color printing.

FIG. 22 is an explanatory diagram illustrating a printing operation of the printing apparatus when performing two-sided two-color printing.

FIG. 23 is an explanatory diagram illustrating a printing operation of the printing apparatus when performing two-sided two-color printing.

FIG. 24 is an explanatory diagram illustrating a printing operation of the printing apparatus when performing two-sided two-color printing.

FIG. 25 is an explanatory diagram illustrating a printing operation of the printing apparatus when performing two-sided two-color printing.

FIG. 26 is an explanatory diagram illustrating a configuration of a printing apparatus according to another embodiment.

FIG. 27 is an explanatory diagram illustrating a configuration of a printing apparatus according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 1st printing cylinder 12 2nd printing cylinder 13 1st blanket cylinder 14 2nd blanket cylinder 15 Impression cylinder 16 Paper feed cylinder 17 Discharge cylinder 18 Reversing cylinder 19 Chain 20 Ink supply device 21 Dampening solution supply device Reference Signs List 22 dampening solution supply device 23 plate supply unit 24 plate discharge unit 25 image recording device 26 development processing device 27 paper supply unit 28 paper discharge unit 57 gripper 83, 84, 85, 86, 87 gripper 140 control unit 211 first plate Cylinder 212 second plate cylinder 213 first blanket cylinder 214 second blanket cylinder 215, 216 impression cylinder P printing plate S printing paper

Claims (7)

[Claims] 1. A printing apparatus for both single-sided printing and double-sided printing, which supplies ink to a printing plate held by a plate cylinder and transfers the ink onto a printing paper held by an impression cylinder via a blanket cylinder. A first and a second plate cylinder holding a printing plate having two image regions on the outer periphery thereof, and contacting the image region of the printing plate on the first plate cylinder with the image region. 2 for supplying ink
A plurality of ink supply means for supplying ink to the image area by contacting the image area on the printing plate on the second plate cylinder;
A first blanket cylinder having the same diameter as the first plate cylinder, and having the same diameter as the second plate cylinder; and a first blanket cylinder abutting on the first plate cylinder. A first blanket cylinder in contact with the second plate cylinder, a diameter of [1/2] times that of the first and second plate cylinders and the first and second blanket cylinders, and an outer periphery thereof An impression cylinder that holds the printing paper in the section and abuts on the first and second blanket cylinders; a printing paper supply unit that supplies the printing paper to the impression cylinder; Printing paper reversing means for receiving the printed printing paper, turning over the printing paper, and passing the printing paper back to the impression cylinder again, and printing the printed paper from the impression cylinder where necessary printing has been completed. Paper discharging means, and control means for selectively operating the printing paper reversing means. Printing apparatus characterized by the. 2. A printing apparatus for both single-sided printing and double-sided printing in which ink is supplied to a printing plate held by a plate cylinder, and the ink is transferred onto a printing paper held by an impression cylinder via a blanket cylinder. Where n and m are natural numbers, and first and second plate cylinders that hold a printing plate having [2n] image regions on the outer periphery thereof; and image regions in the printing plate on the first plate cylinder. [2n] ink supply means for supplying ink to the image area by contacting the image area; and ink to the image area by contacting the image area on the printing plate on the second plate cylinder. [2n] ink supply means for supplying, a first blanket cylinder having the same diameter as the first plate cylinder and abutting on the first plate cylinder, and a second plate cylinder And has the same diameter as that of the second plate cylinder. A first blanket cylinder, [(2m-1) / 2n] times the diameter of the first and second plate cylinders and the first and second blanket cylinders, and [2m- 1] an impression cylinder that holds a sheet of printing paper and abuts on the first and second blanket cylinders; a printing paper supply unit that supplies the printing paper to the impression cylinder; and printing of the first surface from the impression cylinder. Receiving the printing paper that has been completed, performing a reversal operation of passing the printing paper over to the impression cylinder again, and discharging the printing paper having completed the required printing from the impression cylinder. And a control unit for selectively operating the printing paper reversing unit. 3. A printing apparatus for both single-sided printing and double-sided printing in which ink is supplied to a printing plate held by a plate cylinder and the ink is transferred via a blanket cylinder onto printing paper held by an impression cylinder. Where n and m are natural numbers, and first and second plate cylinders holding a printing plate having [2n + 1] image areas on the outer periphery thereof; and image areas in the printing plate on the first plate cylinder. [2n + 1] ink supply means for supplying ink to this image area by contacting the image area; and ink to this image area by contacting the image area of the printing plate on the second plate cylinder. [2n + 1] ink supply means for supplying, a first blanket cylinder having the same diameter as the first plate cylinder and abutting on the first plate cylinder, and a second plate cylinder The second plate having the same diameter as A first blanket cylinder in contact with the cylinder, having a diameter [2m / (2n + 1)] times that of the first and second plate cylinders and the first and second blanket cylinders; 2m] printing paper holding the printing paper and contacting the first and second blanket cylinders; printing paper supply means for supplying printing paper to the impression cylinder; and printing the first surface from the impression cylinder. Receiving the printing paper that has been completed, performing a reversal operation of passing the printing paper over to the impression cylinder again, and discharging the printing paper having completed the required printing from the impression cylinder. And a control unit for selectively operating the printing paper reversing unit. 4. The printing apparatus according to claim 1, wherein the printing paper reversing unit prints the printing paper on which printing on the first surface has been completed on the outer periphery of the impression cylinder. A printing device that passes the position from the holding position at the time to a position whose phase is delayed by a distance that is an integral multiple of the outer circumference of the first and second plate cylinders. 5. The printing apparatus according to claim 4, wherein the printing paper reversing means includes a reversing cylinder that rotates in one direction while holding the printing paper on which printing on the first surface has been completed. A printing apparatus that reverses the printing paper by holding the rear end of the printing paper on which the printing of the surface has been completed with the reversing cylinder as the leading end. 6. A printing apparatus for both single-sided printing and double-sided printing in which ink is supplied to a printing plate held by a plate cylinder, and the ink is transferred via a blanket cylinder onto printing paper held by an impression cylinder. X and Y are mutually prime, and a plate cylinder holding a printing plate having X image areas on the outer periphery thereof; and X ink supply means for supplying ink, a blanket cylinder having the same diameter as the plate cylinder and abutting on the plate cylinder, and a diameter Y / X times the plate cylinder and the blanket cylinder. An impression cylinder that holds Y sheets of printing paper on its outer periphery and abuts on the blanket cylinder, a printing paper supply unit that supplies the printing paper to the impression cylinder, and one holding region in the impression cylinder. Printing finished printing The paper receiving from the one holding area, after reversing of the printing paper, from the one holding area [n
X + Y] (n is a natural number) times, a printing paper reversing means capable of performing a reversing operation to pass to any one holding area of the impression cylinder performing printing, and a printing completed from the impression cylinder required printing A printing apparatus, comprising: printing paper discharging means for discharging paper; and control means for selectively operating the printing paper reversing means. 7. The printing apparatus according to claim 1, wherein the ink supply unit selectively contacts an arbitrary image area of a printing plate in the first and second plate cylinders. Possible printing device.