JPH10157079A - Corrugated sheet printing machine and method of operating the same - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To perform required printing on a corrugated cardboard sheet without circulating flexographic ink, and to perform color change accompanying a change in print order in a short time. SOLUTION: A hollow portion 21a of an ink transfer roll 21 is provided.
Is filled with cooling water. A supply / recovery device 28 for supplying and recovering the flexographic ink to and from the ink storage section A defined between the ink transfer roll 21 and the squeezing roll 22 is provided above the two rolls 21 and 22.
Above the ink reservoir A, a diluent supply pipe 53 for supplying a diluent to the ink reservoir A is provided. The ink transfer mechanism 20 is surrounded by a cover body 54. At a position close to the ink storage unit A, an ink amount detection unit 55 for detecting the amount of stored flexographic ink stored in the storage unit A is provided. Is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing machine for corrugated cardboard sheets and a method for operating the same, and more particularly, to printing on corrugated cardboard sheets by using flexo ink without circulation, and also for printing a print order. Recover old order flexo ink remaining due to changes, etc.
The present invention relates to a corrugated cardboard sheet printing press configured to reduce the amount of waste ink and to quickly replace the ink, and a method of operating the same.

[0002]

2. Description of the Related Art As a method for printing on a cardboard sheet, so-called flexographic printing is generally known. This flexographic printing uses a low-viscosity water-based ink (flexographic ink) that is rich in fluidity.Since ink drying is fast, it can be directly connected to the next process such as die cutter folder gluer after printing. In this case, the sheet after the printing process can be quickly transferred to the next step without temporarily storing the sheet. In addition, there is an advantage that the ink transfer mechanism can be made extremely simple.

[0003]

Since the flexographic printing employs a system for constantly circulating the flexographic ink, it takes time to collect the flexographic ink circulating in the printing press when changing colors, and A large amount of flexographic ink remains in the circulation path, and it is necessary to wash the roll and the circulation system with a large amount of water. For this reason, there is a disadvantage that the flexographic ink is lost, and a facility for treating the cleaning waste liquid is required, resulting in an increase in cost. In addition, when changing colors, it takes time to perform the above operation, which reduces the machine operating efficiency and significantly affects productivity.

[0004] In recent years, the industry has been required to cope with small lots for processing a large variety and a small amount of corrugated cardboard sheets, and the tendency has become remarkable over the years. Considering this with respect to a printing machine, it means that it is necessary to perform color change within a limited time in order to correspond to printing of various and small amounts of corrugated cardboard sheets. However, in the case of flexographic printing, it takes a long time to change colors, and therefore, the response to the frequent order change request accompanying the printing of the small lot is insufficient. Further, there is also a problem of treating the washing waste liquid, which is not suitable for printing such a small lot.

[0005]

The applicant of the present invention has noticed that the above-mentioned various problems in flexographic printing are caused by circulating flexographic ink, and the ink can be used without being circulated. Were tested in various ways. As a result, it was confirmed that even if the flexographic ink had an extremely high quick-drying property, good printing could be performed if a required amount of the ink was stored. However, even if the flexo ink is kept in a non-circulating storage state, it may be caused by the temperature rise of the flexo ink due to frictional heat when adjusting the squeezing between the squeezing roll and the ink transfer roll in the ink transfer mechanism, the surrounding atmosphere, etc. Then, it was confirmed that the viscosity of the ink was increased, which was a factor of reducing the printing accuracy. That is, they have found that the flexo ink can be used without being circulated by keeping the required amount of the flexo ink and suppressing the increase in the viscosity of the flexo ink during operation.

[0006] Accordingly, the present invention has been proposed in view of the above-mentioned problems inherent in the prior art, and has been proposed to solve the problem in a suitable manner. An object of the present invention is to provide a corrugated cardboard sheet printing press capable of performing a color change in response to a change in print order in a short time, and a method of operating the same.

[0007]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems and achieve the intended object, a printing machine for corrugated cardboard sheets according to the present invention comprises a plate cylinder on which a printing plate is mounted and a plate cylinder opposed to the plate cylinder. An impression cylinder, which is disposed so as to be close to and away from the plate cylinder,
A corrugated cardboard sheet comprising: an ink transfer roll that rotates in contact with the printing plate mounted on the plate cylinder when approaching; and an ink amount adjusting member that constantly contacts the ink transfer roll during operation and adjusts the amount of ink. And a weir located at both axial ends of the ink transfer roll and the ink amount adjusting member and closing both longitudinal ends of an ink reservoir defined between the transfer roll and the adjusting member. A member, disposed above the ink transfer roll and the ink amount adjusting member, and movable in the longitudinal direction of the ink storage section to selectively supply the flexographic ink to the storage section and recover the residual ink. Supply and recovery equipment,
A scraper disposed so as to be able to freely contact and separate from the ink amount adjusting member or the ink transfer roll, and scraping and removing the flexo ink transferred to the adjusting member or the transfer roll at the time of the contact; and a scraper stored in the ink storing section. And a cooling means for suppressing a rise in the temperature of the flexographic ink.

In order to achieve the above object, a method of operating a corrugated cardboard sheet printing machine according to another aspect of the present invention includes a plate cylinder having a printing plate mounted thereon, an impression cylinder disposed to face the plate cylinder, and the plate cylinder. The ink transfer roll, which is disposed so as to be able to approach and separate from the ink transfer roll and rotates in contact with the printing plate mounted on the plate cylinder at the time of close proximity, and always contacts the ink transfer roll during operation to adjust the ink amount. In the printing press for a corrugated cardboard provided with an ink amount adjusting member for performing the following, the longitudinal direction both ends of the ink reservoir defined between the ink transfer roll and the ink amount adjusting member are closed by a weir member. Storing the ink by supplying the flexo ink to the ink storage unit in a non-circulating manner from a supply / recovery device disposed above the ink storage unit and movable in the longitudinal direction of the storage unit; Saving The flexo ink stored in the portion is transferred to the printing plate via the ink transfer roll, and a corrugated cardboard sheet is passed between the plate cylinder and the impression cylinder rotating in opposite directions to each other. During the printing operation, the temperature of the flexo ink stored in the ink storage unit is suppressed by cooling means, and when the color is changed in accordance with the order change, the remaining amount of the flexo ink remains in the ink storage unit. Flexo ink is supplied and
The ink is recovered by a recovery device, and then a cleaning liquid is supplied between the ink transfer roller and the ink transfer member, and a scraper is brought into contact with the ink transfer member or the ink transfer roller to scrape off the cleaning waste liquid by the scraper. It is characterized by doing so.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a printing machine for corrugated paperboard sheets and a method for operating the same according to the present invention will be described below with reference to the accompanying drawings, by way of preferred embodiments.

[0010]

FIG. 1 is a schematic side view of a cardboard sheet printing machine according to a first embodiment, showing a printing state on a cardboard sheet. FIG. 2 shows a flexographic printer slotter provided with a printing press according to the first embodiment. The flexographic printer slotter 11 includes a supply device 13 for a corrugated cardboard sheet 12 and two printing presses 10 and 1.
0, the creaser 14 and the slotter 15 are arranged in series. Then, the corrugated cardboard sheet 12 passing through these units is printed as required, and various processes such as cleaning and slotting are sequentially performed.

The illustrated printing press 10 includes a corrugated cardboard sheet 12.
Frame 1 separated by a predetermined distance in the direction intersecting the feeding direction of
Between 6, 16 (only a part is shown), a plate cylinder 18 to which a printing plate 17 is removably mounted, and an impression cylinder 19 disposed below and opposed to the corrugated cardboard sheet 12 with a pass line interposed therebetween are rotatably provided. The plate cylinder 18 and the impression cylinder 19 are rotated in mutually opposite directions.

As shown in FIG. 1, an ink transfer mechanism 20 for transferring flexographic ink to the printing plate 17 is provided above the plate cylinder 18. This ink transfer mechanism 20
Is an ink transfer roll 21 for directly transferring the supplied flexographic ink to the printing plate 17; a squeezing roll 22 as an ink amount adjusting member which is pressed against the roll 21 to adjust the squeezing of the ink amount; It basically comprises a swing mechanism 23 that can displace the ink transfer roll 21 in a required angle range around the rotation axis. By selectively operating the oscillating mechanism 23, the ink transfer roll 21 is brought into contact with the printing plate 17 to transfer the flexographic ink to the printing plate 17.
(FIG. 5) and a stand-by position (FIG. 6) which is separated from the printing plate 17 to make the ink transfer impossible. That is, the ink transfer roll 21 is disposed so as to be able to approach and separate from the plate cylinder 18, and when approaching, the plate cylinder 18
And is rotatable in contact with the printing plate 17 attached to the printing plate 17.
On the surface of the ink transfer roll 21, anilox is formed in which fine depressions are concavely formed in a required pattern. These fine depressions serve to store a fixed amount of flexo ink and to prevent ink scattering when the roll rotates. doing. Although an iron-based metal material is used for the ink transfer roll 21, a ceramic coating may be formed on the surface of the metal roll by explosive spraying or the like, and anilox may be engraved on the ceramic coating. Further, as the ink transfer roll 21, an iron roll without anilox engraving (plated only) or a simple rubber roll can be suitably used.

A squeezing roll 22 disposed adjacent to the ink transfer roll 21 is always in contact with the ink transfer roll 21 during operation, and rotates at the same speed or a low speed as the ink transfer roll 21. It functions to adjust the excess ink on the surface of the surface 21. The squeezing roll 22 is preferably made of an iron-based metal material or a flexible material such as rubber. When a rubber material is used, it is recommended that the hardness be appropriately selected within a range of, for example, 50 to 75 degrees of Shore hardness according to the length of the roll.

The ink transfer roll 21 is formed in a hollow shape as shown in FIG. 1, and is configured so that a predetermined amount of cooling water 70 as cooling means can be filled in the hollow portion 21a. Then, the ink transfer roll 2 during the printing operation
By suppressing the generation of frictional heat due to the peripheral speed difference between the roll 1 and the squeezing roll 22, the cooling water 70 suppresses the temperature rise of the flexographic ink stored in the ink storing section A (described later). It has become.

The swing mechanism 23 of the ink transfer mechanism 20
Is a squeezing roll 2 rotatably disposed on the machine frames 16, 16.
2 is provided with a pair of support brackets 24, 24 (only one is shown in FIGS. 1 and 5) rotatably supported on both shaft ends facing the inside of the machine frame 16 in the support frame 24, 2
An ink transfer roll 21 is rotatably supported between the four. Ink transfer roll 2 in each support bracket 24
At the upper end on the side where 1 is pivotally supported, holding members 25 are respectively disposed, and a corresponding eccentric ring eccentrically disposed on a switching shaft 26 rotatably supported between the machine frames 16 and 16. 27,
Each holding member 25 is pivotally supported rotatably. The switching shaft 26 is rotatably driven by a motor or an air cylinder (not shown). Therefore, by rotating the eccentric wheels 27 at a predetermined center angle by urging the motor or the air cylinder, the ink transfer roll 21 is
As shown in FIG. 5, an ink transfer position where the flexo ink is transferred by contacting the printing plate 17 and a standby position where the transfer of the flexo ink is disabled as shown in FIG. Can be done. Further, a mechanism for giving different rotations to both rolls 21 and 22 is known per se, and a description thereof will be omitted. In addition,
The ink transfer roll 21 is set to be moved to the standby position via the swing mechanism 23 when performing ink replacement, which will be described later, and when the cardboard sheet 12 is no longer passed.

In the ink transfer roll 21 and the squeezing roll 22, when the two rolls 21 and 22 are pressed against each other, an ink reservoir A can be defined in a contact area in the longitudinal direction of the two rolls. I have. A supply / recovery device 28 for supplying the flexo ink to the ink storage section A and recovering the flexo ink remaining in the storage section A is provided above the two rolls 21 and 22. In addition, if the ink supply amount during printing is too small, the printing surface may be blurred or missing. Therefore, as shown in FIGS. 3 and 4, the supply / recovery device 28 can supply the flexographic ink to the necessary places in a focused manner by adjusting the ink supply amount to the pattern of the printed matter. That is, a guide rail 29 parallel to the two rolls 21 and 22 is provided between the upper ends of the machine frames 16 and 16, and a movable table 31 is movably supported on the rail 29 via a plurality of rollers 30. . The movable table 31 is connected to, for example, an endless chain (not shown) driven by a motor, and is configured to reciprocate along a guide rail 29.

A pair of brackets 32, 32 spaced apart in the moving direction of the moving table 31 hang down above the squeezing roll 22, and a mounting plate 33 is horizontally disposed at the lower end thereof. Have been. And both brackets 32, 32
An ink pot 34 in which a predetermined amount of flexo ink is stored is removably mounted on a mounting plate facing the space therebetween. Also, in FIG.
A tubing pump 35 and a reversible motor 36 for driving the pump 35 are arranged on a mounting plate 33 extending outward from the mounting plate 42 via a mount 42. A flexible tube 37 is detachably inserted into the tubing pump 35, and a rigid pipe 38 (for example, a copper pipe) is connected to one end 37 a of the tube 37. Is immersed in the flexo ink stored in the ink pot. The other end 37b of the flexible tube 37 is attached to a holder 45 described later and has one end facing the other end of a rigid pipe 40 (for example, a copper pipe) having one end facing above the ink reservoir A. Communication is established.

The basic structure of the tubing pump 35 is known, and the flexible tube 37 is continuously drawn down by a plurality of rollers 41 moving along a predetermined orbit so that the flexo ink in the tube is removed. Is extruded in a predetermined direction. That is, the reversible motor 36
When the roller 41 of the tubing pump 35 is moved clockwise in FIG. 7 by urging the ink in the forward direction, the flexo ink in the flexible tube 37 is pushed out from the end 37b to the pipe 40, thereby the ink pot The 34 flexographic inks are supplied to the ink storage section A. When the reversible motor 36 is urged in the reverse direction to move the roller 41 in the counterclockwise direction, the flexo ink in the flexible tube 37 is pushed out from the end 37a to the pipe 38. The flexo ink is set to be collected in the ink pot 34.

Mounting base 42 for tubing pump 35
As shown in FIG. 7, an air cylinder 44 is arranged upside down on the upper surface of a bracket 43 disposed in the cylinder 43.
The holder 45 is disposed on a piston rod 44a hanging down from the lower surface of the bracket 43 in FIG. This holder 4
5, a pipe 40 bent in the illustrated shape is detachably provided via a plurality of holders 46.
Is connected to an end 37b of a flexible tube 37 extending from the tubing pump 35.
(See FIG. 5). Further, the other end of the pipe 40 is
The nozzle 47 is suspended from the ink storage unit A by a predetermined length from 5 and is connected to a nozzle 47 at this end. That is, when the ink is changed in accordance with a change in the print order, the nozzle 47 connected to the pipe 40 is immersed in the old-order flexographic ink remaining in the ink reservoir A by urging the air cylinder 44 in a required direction. (See FIG. 9B). If the reversible motor 36 is urged in the reverse direction in this state, the flexographic ink remaining in the ink storage section A can be collected in the ink pot 34. Note that the tubing pump 35 itself can be raised and lowered by appropriate means to change the height position of the nozzle 47.

The mounting plate 33 is provided with a cleaning liquid supply pipe (not shown) via appropriate means, and an opening of the cleaning liquid supply pipe faces the ink storing section A. A cleaning liquid tank disposed at an appropriate fixed position is connected to the cleaning liquid supply pipe via a pipe (neither is shown), and the cleaning liquid stored in the tank is fed to the supply pipe by compressed air. It is supposed to be. That is, the supply and recovery device 2
8 supplies the flexographic ink to the above-described ink storage section A via the flexible tube 37 and the pipes 38 and 40 during the printing operation. When the color is changed due to a change in the printing order of the corrugated cardboard sheet 12, the old-order flexographic ink remaining in the ink storage section A is collected, and the cleaning liquid is supplied to the storage section A via a cleaning liquid supply pipe (not shown). It is configured to be.

As shown in FIG. 8, an air cylinder 49 is disposed on each of the support brackets 24 via a support member 48, and a piston rod 49a of the air cylinder 49 is provided.
Is provided with a plate-shaped dam member 50. This weir member 50
Is lowered by the urging of the air cylinder 49 during the printing operation, and is defined between the rolls 21 and 22 by bringing the weir member 50 into close contact with the axial ends of the ink transfer roll 21 and the squeezing roll 22. To close the ink reservoir A,
The flexo ink and the cleaning liquid supplied from the supply / recovery device 28 can be stored in the storage section A in a non-circulating state. When cleaning the ink, the weir member 5
0 is raised as necessary by the reverse bias of the air cylinder 49 to open the ink reservoir A, and the washing waste liquid that has washed away the flexo ink remaining in the reservoir A is discharged from both ends in the longitudinal direction. It is configured to be able to. A gutter member 51 is disposed below both ends of the ink transfer roll 21 and the squeezing roll 22 in the axial direction, and the gutter member 51 receives the cleaning waste liquid flowing out of the ink reservoir A by the opening operation of the weir member 50. Thus, the ink is collected in an ink pan 52 described later.

Above the ink storage section A, a diluting liquid supply pipe (diluting liquid supply means) 53 communicating with a diluting liquid supply source (not shown) such as water or a suitable solvent is provided. Tube 53
The diluting liquid can be supplied to the ink reservoir A through a supply hole 53a formed in the ink reservoir. That is, the viscosity of the flexographic ink stored in the reservoir A is always kept constant by supplying a required amount of the diluent to the ink reservoir A through the diluent supply pipe 53 at the appropriate time during the printing operation. Can be used to print. The dilution liquid supply pipe 53
Is supplied based on a detection value of a means (not shown) for detecting the viscosity of the flexographic ink stored in the ink storing section A, or at a predetermined time interval by a timer or the like. .

As shown in FIG. 1, the ink transfer mechanism 20 is surrounded by a cover body 54, and the amount of water of the flexographic ink stored in the ink storing section A is changed to the surrounding atmosphere.
(Mainly humidity), and is prevented from changing due to evaporation or drying due to the flow of air. The cover body 54 is formed in a box shape surrounding the ink transfer mechanism 20 and has a plate cylinder 1
An opening 54a is formed along the longitudinal direction to allow contact between the printing plate 17 and the ink transfer roll 21 provided in the printing plate 8. It is recommended that the cover 54 be formed of a transparent material whose inside is visible.

At a position close to the ink storing section A, an ink amount detecting means 55 for detecting the amount of the flexo ink stored in the storing section A is provided, and based on the detected value by the means 55, The operation of the reversible motor 36 for driving the tubing pump 35 of the supply / recovery device 28 is controlled so that the required amount of flexographic ink is always stored in the ink storing section A. This ink amount detecting means 55
Various means such as an opposing or reflective photoelectric sensor, a television camera or a float switch, or a stylus sensor are used as appropriate. It is recommended that the ink amount detecting means 55 be disposed near both ends in the longitudinal direction of the ink storage section A, respectively.

At a substantially tangential position close to the squeezing roll 22, a scraper 56 composed of a long blade-like plate for cleaning the old-order flexographic ink when changing the ink by changing the order or the like is provided. (Fig. 4
reference). The tip of the scraper 56 is directed along the tangential direction in a direction opposite to the rotation direction of the squeezing roll 22, and is rotated forward and reverse by an appropriate motor 57 so that the scraper 56 can freely contact and separate from the roll surface. . When cleaning the flexographic ink, the swing mechanism 23 provided in association with the ink transfer mechanism 20 is operated to
The ink transfer roll 21 is displaced in the counterclockwise direction around the rotation axis of the ink jet printer 1 as shown in FIG. Next, by urging the motor 57 to bring the scraper 56 into contact with the squeezing roll 22, the washing waste liquid and the flexographic ink transferred to the roll 22 are scraped up and removed. The removed washing waste liquid and flexographic ink are collected in an ink pan 52 provided below the scraper 57. A waste liquid pipe (both not shown) communicating with the waste liquid tank is connected to the ink pan 52, and the waste liquid collected in the ink pan 52 is collected in a waste liquid tank provided at a required portion. The gutter member 51
The washing waste liquid discharged into the tank may be directly guided to the waste liquid tank without passing through the ink pan 52. The disposition position of the scraper 56 is not limited to the position shown in FIG. 1, and may be set to any position as long as the cleaning waste liquid and the flexo ink removed by the scraper 56 do not flow into the ink storage section A. For example, in FIG. 1, it may be at the left or right position or the upper side of the rotation center of the squeezing roll 22. Further, even if the scraper 56 is provided on the ink transfer roll 21 side,
Acts similarly.

For the scraper 56, a flexible material such as an iron-based metal material or rubber is appropriately selected. When the squeezing roll 22 is made of a flexible material such as rubber, it is recommended that the scraper 56 be made of a material having a hardness lower than the hardness of the roll 22 (for example, a rubber plate having a low hardness). Thus, when the scraper 56 is brought into contact with the squeezing roll 22 to scrape the flexographic ink, the squeezing roll 22 can be prevented from being damaged. In this case, the scraper 56
It is not always necessary that the whole is made of a soft material, and a soft material may be separately provided at the tip of the scraper 56 made of a metal material. In the illustrated example, the tip of the scraper 56 is directed in a direction opposite to the rotation direction of the squeezing roll 22, but is not limited to this. Conversely, the scraper 56 may be configured to be able to freely contact and separate from the surface of the roll 22 in a state where the scraper 56 is directed in the forward direction with respect to the rotation direction of the squeezing roll 22. Further, as means for bringing the scraper 56 into contact with and separating from the squeezing roll 22,
A linear actuator such as an air cylinder can also be used.

[0027]

Next, the operation of the printing machine for a corrugated cardboard sheet of the first embodiment according to the above-described configuration will be described.
A description will be given in relation to the driving method. As a preparatory work for printing, the swing mechanism 23 described above is operated to
The ink transfer roll 21 is displaced clockwise about the rotation axis of. Thereby, as shown in FIG. 5, the ink transfer roll 21 of the ink transfer mechanism 20 is brought into contact with the plate cylinder 18 (printing plate 17). The scraper 56 is separated from the squeezing roll 22. Furthermore, both rolls 2
The weir members 50, 50 provided at both ends in the axial direction of 1, 22 are at the lowered position, and close both ends in the longitudinal direction of the ink storage section A. A flexible tube 37 inserted in the tubing pump 35 of the supply / recovery device 28
Has a pipe 38 connected to one end 37a immersed in the ink stored in the ink pot 34, and the other end 37b connected to one end of the pipe 40. The nozzle 47 connected to the other end of the pipe 40 faces above the ink storing section A (see FIG. 9A).

In this state, when the reversible motor 36 is urged in the forward direction, the roller 41 of the tubing pump 35 moves clockwise, and the roller 41 continuously squeezes the flexible tube 37, thereby causing the ink pot to move. The flexo ink 34 is supplied between the rotating ink transfer roll 21 and the squeezing roll 22 (ink storage section A). The flexographic ink is stored in a non-circulating state regulated by the weir members 50 facing the shaft ends of the rolls 21 22. If the supply / recovery device 28 is moved in the axial direction to supply the flexographic ink, the ink storage unit A
In a short time, a predetermined amount of flexographic ink can be stored.

Thus, an appropriate amount of flexographic ink is transferred to the surface of the printing plate 17 mounted on the plate cylinder 18 via the ink transfer roll 21. Under this condition, the supply device 13 removes the corrugated cardboard sheets 12 one by one from the plate cylinder 18.
And between the impression cylinder 19 and the
Is subjected to the required printing. Since the flexographic ink is quick-drying, it can be immediately sent to another printing press 10 and a post-process cleaner 14 or slotter 15 after printing. When the ink amount detecting means 55 detects that the flexo ink stored in the ink storing section A has been consumed and the amount of the stored flexo ink has become a predetermined value or less, the tubing pump 35 is operated by the reversible motor 36. Then, the flexo ink is supplied from the ink pot 34 to the storage section A. That is, the required amount of flexo ink is always stored in the ink storage section A, and the ink is stored in the ink transfer roll 2.
1 and the squeezing roll 22, the color is not uneven in the width direction at the time of printing, so that the operator does not need to constantly monitor the printing state.

In the above-described printing operation, frictional heat is generated in a longitudinal contact area between the ink transfer roll 21 and the squeezing roll 22 due to a peripheral speed difference between the two rolls. However, since the inside of the ink transfer roll 21 is filled with the cooling water 70, the ink transfer roll 21 is cooled by the cooling water 70, and the outer peripheral surface of the roll is always kept in a cooled state. Therefore, the generation of the frictional heat between the two rolls is effectively suppressed, and the temperature rise of the flexographic ink stored in the ink storing section A is suppressed. In addition, since the ink transfer mechanism 20 is surrounded by the cover body 54, the change in the viscosity of the flexographic ink due to the evaporation of the moisture of the flexo ink due to the change in the external atmosphere or the air flow is also suppressed. Therefore,
Even if the flexo ink is not circulated, it is possible to reliably prevent the occurrence of printing unevenness due to a change in ink viscosity.

Depending on the printing conditions and the like, even if the above-described configuration for suppressing a change in ink viscosity is employed, the flexo ink can be squeezed and adjusted by the ink transfer roll 21 and the squeezing roll 22 during the printing operation. It is also conceivable that the viscosity of the ink increases. However, in the printing press 10 according to the first embodiment, the diluting liquid is supplied to the ink storing section A through the diluting liquid supply pipe 53, so that the viscosity of the flexographic ink stored in the storing section A is Is always kept constant. Therefore, in the printing press 10,
With the flexo ink always kept in a good state, it is possible to print beautifully on the cardboard sheet 12. Further, since the flexo ink is not circulated, the flexo ink conventionally required for circulation can be omitted, the lot unit at the time of ink purchase can be reduced, and the inventory cost can be reduced.

The cardboard sheet 1 by the supply device 13
When the supply of ink is stopped, the swinging mechanism 23 is operated in reverse, and the ink transfer roll 21 is displaced counterclockwise about the rotation axis of the squeezing roll 22, and as shown in FIG. It is moved to a standby position separated from the plate 17). Note that the ink transfer roll 21 and the squeezing roll 22 are always rotating even in this standby position.

When the flexo ink to be used is changed for the color change accompanying the change of the printing order, etc., the ink is collected and washed in the following procedure. The tubing pump 35 is moved to the ink transfer mechanism 20 that has moved to the standby position because the corrugated cardboard sheet 12 is no longer passed.
In a state in which the ink supply is stopped, the air cylinder 44 is urged to extend the rod 44a, thereby lowering the pipe 40 and the nozzle 47 together with the holder 45, and as shown in FIG. 47 is immersed in the old-order flexographic ink remaining in the ink reservoir A.
Next, the reversible motor 36 is urged in the reverse direction to move the roller 41 of the tubing pump 35 in a counterclockwise direction, so that the ink remaining in the ink storage section A passes through the pipes 40 and 38 and the flexible tube 37. And is collected by the ink pot 34. Thereby, the flexographic ink remaining in the storage section A without being used can be collected, and the ink can be prevented from being wasted. At this time, if the supply / recovery device 28 is moved in the longitudinal direction of the ink storage section A and the recovery of the flexographic ink is performed at the same time, the recovery time can be reduced.

Most of the flexo ink remaining in the ink storage section A when the print order is changed is recovered by the supply / recovery device 28, but a small amount of flexo ink is stored in the anilox of the ink transfer roll 21. It remains. Therefore, the cleaning liquid is supplied to the ink storage section A defined between the rolls 21 and 22 via a cleaning liquid supply pipe disposed in the supply / recovery device 28. This reservoir A
Since both ends in the longitudinal direction are closed by the weir members 50, 50, the cleaning liquid is stored in a state of extending over the entirety in the axial direction. In this state, after performing a washing operation in which the ink transfer roll 21 and the squeezing roll 22 idle at the same peripheral speed for a predetermined time, the weir members 50,
When the ink storage unit A is opened by raising the ink tank 50, the cleaning waste liquid that has washed away the flexo ink remaining on the ink transfer roll 21 is discharged from both ends of the storage unit A to the gutter member 51. Further, the washing waste liquid is discharged from the gutter member 51 to the ink pan 52, and is recovered from here to a waste liquid tank (not shown). When the cleaning liquid is supplied to the ink storage section A, the cleaning time can be reduced by moving the supply / recovery device 28 in the longitudinal direction of the storage section A.

Next, with the ink transfer roll 21 and the squeezing roll 22 idle, the scraper 5 is rotated.
The cleaning waste liquid adhering to the roll 22 is scraped up and removed by bringing the 6 into contact with the squeezing roll 22. The cleaning waste liquid scraped up and removed by the scraper 56 is collected in the waste liquid tank via the ink pan 52.

As described above, when the color is changed in accordance with the order change, the flexo ink remaining in the ink storage section A can be recovered, so that the amount of the flexo ink wastefully discarded can be extremely reduced, and the flexo ink can be saved. Can be Further, the flexographic ink adhering to the ink transfer roll 21 can be reliably removed only by using an extremely small amount of the cleaning liquid. Further, since the flexo ink is not circulated, there is no need to clean the ink circulation system, so that the order can be changed in a short time and it is possible to suitably cope with various kinds of small lot printing. Further, since the amount of the cleaning liquid used for ink cleaning is small, the amount of the cleaning waste liquid can be extremely reduced, which can greatly contribute to the prevention of pollution.

When the ink is washed, in addition to the above-described method, after collecting the washing waste liquid, the scraper 56 is brought into contact with the squeezing roll 22 to remove the flexographic ink adhering to the roll 22. Is also good. Further, after the flexo ink on the squeezing roll 22 is scraped off by the scraper 56, the cleaning is performed by supplying a cleaning liquid between the ink transfer roll 21 and the squeezing roll 22 while keeping the scraper 56 in contact with the roll 22. Or after scraping off the flexo ink of the squeezing roll 22, once the scraper 56 is separated from the roll 22, and when the cleaning liquid has spread over the entire roll axis direction, the scraper 56 is squeezed again. 2
2, and the cleaning waste liquid may be collected in the ink pan 52. In the case of, the ink transfer roll 21
Most of the flexo ink remaining on the rolls 21 and 22 can be removed via the scraper 56, so that a very small amount of the cleaning liquid to be supplied between the rolls 21 and 22 can be used.

Further, by increasing the squeezing interval between the ink transfer roll 21 and the squeezing roll 22, the ink storage section A
The flexo ink remaining on the squeezing roll 22 is transferred to the surface of the squeezing roll 22 as a thick film,
May be scraped off. Then, after performing the operation in a state where the squeezing distance between the ink transfer roll 21 and the squeezing roll 22 is widened for a predetermined time, the scraper 56 is operated with the squeezing distance between the ink transfer roll 21 and the squeezing roll 22 narrowed. , A small amount of flexo ink remaining in the anilox of the ink transfer roll 21 is transferred to the squeezing roll 22 and is reliably removed. In addition, even in the case of removing the washing waste liquid, by performing the same process, the waste liquid can be removed reliably and in a short time.

[0039]

Second Embodiment FIG. 10 is a schematic side view showing a cardboard sheet printing machine according to a second embodiment.
The basic configurations of the plate cylinder 18, the impression cylinder 19, and the flexo ink supply / recovery device 28 are the same as those of the first embodiment. However, the ink transfer roll 21 in the ink transfer mechanism 20
The mechanism for adjusting the amount of ink is different. That is,
On a pair of support brackets 24, 24 on which the ink transfer roll 21 is rotatably supported, an adjusting plate 58 as an ink amount adjusting member formed of a long plate is provided in a forward direction with respect to the rotation direction of the transfer roll 21, The tip is directed along the tangential direction. An ink storage section A for storing the flexo ink supplied from the supply / recovery device 28 is defined between the ink transfer roll 21 and the adjustment plate 58, and both ends in the longitudinal direction of the storage section A are formed. Weir member 50,5
It is configured to be closed by 0.

The adjusting plate 58 is connected to a motor 59,
The forward and reverse biasing of the motor 59 adjusts the distance between the leading end and the roll surface, so that the ink transfer roll 21
Is configured to adjust the amount of ink on the surface. Note that the distance between the adjustment plate 58 and the ink transfer roll 21 may be adjusted by a linear actuator such as an air cylinder instead of the motor 59.

A scraper 60 made of a long plate is disposed at a position close to the ink transfer roll 21, and the scraper 60 is connected to a fluid pressure cylinder 61 and can freely contact and separate from the roll surface. . And the scraper 6
By contacting 0 with the ink transfer roll 21, the flexo ink and the washing waste liquid transferred to the roll 21 are removed, and the removed flexo ink and washing waste liquid are
The ink is collected by an ink pan 52 provided below the scraper 60. The drive source of the scraper 60 may be a motor as in the first embodiment. The disposition position of the scraper 60 is not limited to the position shown in FIG. 10, and may be set to any position as long as the flexo ink and the cleaning waste liquid removed by the scraper 60 do not enter the ink storing section A. For example, it may be on the right side or above the ink transfer roll 21 in FIG.

The ink transfer roll 21 is displaced between an ink transfer position where the flexo ink is transferred by contacting the printing plate 17 and a standby position where the ink transfer roll 21 is separated from the printing plate 17 and the transfer of the flexo ink is disabled. Swing mechanism 2
3 is basically the same as the first embodiment. However, each of the support brackets 24 is rotatably supported by the machine frame 16 via a protruding shaft 62 that protrudes outward (on the side away from the other opposing support bracket 24). Then, by rotating the switching shaft 26, the support brackets 24, 24 are rotated about the protruding shafts 62, 62, and the ink transfer roll 21 is displaced between the ink transfer position and the standby position.

[0043]

Next, the operation of the corrugated cardboard sheet printing machine according to the second embodiment will be described. Since the basic operation is the same as that of the first embodiment, only different parts will be described. As a preparatory work for printing, as shown in FIG.
The gap between the tip of the ink transfer roll 21 and the surface of the ink transfer roll 21 is adjusted to an appropriate value by urging the motor 59, and the scraper 60 is separated from the ink transfer roll 21. Then, the flexo ink is supplied to the ink storage section A defined between the adjusting plate 58 and the ink transfer roll 21 via the supply / recovery device 28 to store a required amount in a non-circulating state.

When the printing operation is started in this state, the corrugated paperboard sheet 12 supplied between the plate cylinder 18 and the impression cylinder 19 from the supply device 13 is subjected to required printing. In addition,
Also in the second embodiment, a required amount of flexo ink is always stored in the ink storage section A in a non-circulating state, and a diluting liquid is supplied in a timely manner so that the viscosity of the flexo ink is kept constant. Also, the cooling water 70 filled in the hollow portion 21a of the ink transfer roll 21 and the cover body 54 surrounding the ink transfer mechanism 20 suppress the change in the viscosity of the flexographic ink stored in the ink storage portion A, Good printing can be performed on the corrugated cardboard sheet 12. In addition, the cardboard sheet 1 by the supply device 13 is used.
When the supply of the ink transfer roller 21 is stopped, the swing mechanism 23 is operated in reverse, and the ink transfer roller 21 is displaced in the counterclockwise direction about the protruding shafts 62, 62, thereby bringing the ink transfer roller 21 to the standby position. I do.

When the flexo ink to be used is changed for the color change accompanying the change of the print order, etc., the ink is collected and washed in the following procedure. Flexo ink remaining in the ink storage unit A is collected by the supply / collection device 28 for the ink transfer mechanism 20 that has moved to the standby position because the corrugated cardboard sheet 12 is no longer passed. Next, the adjusting plate 58 is brought into contact with the roll 21 and, via a cleaning liquid supply pipe disposed in the supply / recovery device 28,
After the cleaning operation is performed for a predetermined time in a state where the cleaning liquid is supplied to and stored in the ink storage section A, the cleaning waste liquid is discharged from the ink storage section A to the outside. Further, by energizing the fluid pressure cylinder 61 and bringing the scraper 60 into contact with the ink transfer roll 21 at an appropriate pressure, the transfer roll 2
The cleaning waste liquid adhering to the surface of No. 1 is scraped up and removed by the scraper 60 and collected by the ink pan 52, thereby completing the ink cleaning.

After the flexo ink is collected, the flexo ink adhered to the ink transfer roll 21 is removed by the scraper 60 or the scraper 6 is removed.
After the flexo ink of the ink transfer roll 21 is scraped off by 0, the cleaning may be performed by supplying the cleaning liquid to the ink storage section A while the scraper 60 is kept in contact with the roll 21. Furthermore, a scraper 6
When the flexo ink is removed by 0, the distance between the ink transfer roll 21 and the adjustment plate 58 is increased so that the ink is adhered to the surface of the transfer roll 21 so that efficient scraping and removal can be performed. In addition, it goes without saying that other methods described with respect to the first embodiment can be appropriately adopted.

[0047]

[Modification] FIG. 11 shows a modification for cooling the ink transfer roll, wherein a hollow rotary shaft communicating with a hollow portion 21a is provided at both ends of a hollow ink transfer roll 21. 63, 63 are formed. The two hollow rotary shafts 63, 63 are connected to the support brackets 24, 2 respectively.
It is rotatably supported via bearings 64, 64 disposed in the same. Further, the support bracket 24 of the one rotating shaft 63
A cooling water supply pipe 66 is connected to the open end protruding outward from the support bracket 24 of the other rotating shaft 63 in a liquid-tight manner via a rotary joint 65. A cooling water discharge pipe 67 is connected in a liquid-tight manner via a rotary joint 65. Cooling water 70 is circulated and supplied from a cooling water supply source (not shown) to a pipe system including a cooling water supply pipe 66 and a cooling water discharge pipe 67.
The hollow portion 21a of the ink transfer roll 21 is filled with cooling water.

That is, in the modification of FIG. 11, when the printing press 10 is operated, the cooling water 70 is supplied to the hollow portion 21a of the ink transfer roll 21 of the ink transfer mechanism 20 via the pipe system during the rotation. Circulated supply. Accordingly, the generation of frictional heat generated between the ink transfer roll 21 and the squeezing roll 22 or between the ink transfer roll 21 and the adjustment plate 58 is effectively suppressed, and the temperature of the flexographic ink supplied to the ink storage unit A does not rise. In addition, it is possible to prevent a change in ink viscosity and the occurrence of uneven printing beforehand.

FIGS. 12 and 13 show the ink transfer mechanism 2.
0 shows a modification of the swing mechanism at 0, in which a piston rod 71a of an air cylinder 71 disposed on the machine frame 16 is mounted on each support bracket 24 on which the squeezing roll 22 and the ink transfer roll 21 are pivotally supported. Be linked. The ink transfer roll 21 is selectively moved between an ink transfer position and a standby position by urging the pair of air cylinders 71 forward and backward in synchronization.

In each of the above-described embodiments, the supply and recovery of the flexographic ink is performed by one supply / recovery device. However, the present invention is not limited to this. They may be arranged in series. in this case,
Since each supply / recovery device only needs to move in a short area, the flexo ink can be quickly supplied to a required portion of the ink storage section. In each of the embodiments, the case where the supply of ink to the ink storage unit and the collection of ink are performed using a tubing pump has been described. However, the present invention is not limited to this, and any pump that can be biased forward and backward is used. Other types may be employed, for example. For example, by changing the inside of the box housing the ink tank between a depressurized state and a pressurized state, the flexo ink in the tank is supplied to the ink storage section, and the flexo ink remaining in the storage section is recovered. Can be adopted.

The squeezing roll may be hollow, and the hollow portion may be filled with cooling water or circulated and supplied to cool the squeezing roll. It is also possible to circulate and supply cool air inside the ink transfer roll and the squeezing roll. Furthermore, by arranging a cooling device inside the cover body as a cooling means and adjusting the temperature inside the cover body by the cooling device, it is possible to suppress a rise in the temperature of the flexo ink stored in the ink storage unit. It is. Further, it is also possible to adopt a configuration in which the humidity inside the cover body is kept constant via an appropriate humidity adjusting means. Furthermore, a means for supplying the diluting liquid to the ink storing section may be provided in the supply / recovery device. In addition, the ink amount detecting means
A plurality of ink reservoirs can be arranged in the longitudinal direction.

[0052]

As described above, according to the corrugated cardboard sheet printing press and the method of operating the same according to the present invention, the supply and supply of the ink to the ink storage section defined between the ink transfer roll and the ink amount adjusting member is performed. A required amount of flexo ink is always stored in a non-circulating state via the recovery device, and the change in the viscosity of the ink is suppressed by suppressing the temperature rise of the flexo ink stored in the ink storage unit by the cooling means. I tried to keep it down. As a result, it is possible to use the flexo ink which has conventionally been required to be circulated without being circulated, and it is possible to reduce the amount of used ink and to omit a mechanism for constantly circulating the ink. Further, by supplying the diluting liquid to the ink storing section, the change in the viscosity of the flexographic ink can be further suppressed. Furthermore, by surrounding the ink storage section with a cover body, the flexo ink stored in the storage section can be prevented from undergoing a change in viscosity due to the influence of the external atmosphere, and printing can always be performed in a good state. Can be performed.

When changing colors due to a change in print order, etc.,
Since the flexo ink remaining in the ink storage section can be collected via the supply / collection device, the amount of the flexo ink that is wasted and discarded can be reduced to a very small amount, and the flexo ink can be saved and color change is required. Time can be significantly reduced. That is, it is possible to sufficiently cope with printing of various and small amounts of corrugated cardboard sheets. In addition, since there is no need to constantly circulate the flexo ink as described above, the amount of washing waste liquid is extremely small, so that the flexo ink can be largely saved and it is extremely advantageous from the viewpoint of preventing pollution. Further, since a flexographic ink circulation mechanism is not required, space saving and low cost can be realized. In addition, since the color change can be performed in a short time, the machine operation efficiency increases,
There is also an advantage that productivity is improved.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an entire printing press according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a flexo printer slotter including the printing machine according to the first embodiment.

FIG. 3 is a schematic perspective view of the entire printing press according to the first embodiment.

FIG. 4 is a schematic perspective view illustrating a schematic configuration of an ink transfer mechanism and a supply / recovery device of the printing press according to the first embodiment.

FIG. 5 is a schematic side view of the printing press according to the first embodiment, showing a printing state on a cardboard sheet.

FIG. 6 is a schematic side view of the printing press according to the first embodiment, showing an ink cleaning state after printing is completed.

FIG. 7 is a schematic front view showing a supply / recovery device of the printing press according to the first embodiment.

FIG. 8 is a schematic front view of a main part showing an arrangement portion of a weir member of the printing press according to the first embodiment.

FIG. 9 is an explanatory diagram showing an ink supply state and an ink recovery state of the supply / recovery device in the printing press according to the first embodiment.

FIG. 10 is a schematic side view showing a printing press according to a second embodiment of the present invention.

FIG. 11 is an explanatory view showing a modified example of a configuration for cooling an ink transfer roll.

FIG. 12 is a partial explanatory side view showing a modified example of the swing mechanism in the ink transfer mechanism.

FIG. 13 is a partial explanatory front view showing a modified example of the swing mechanism in the ink transfer mechanism.

[Explanation of symbols]

 REFERENCE SIGNS LIST 12 corrugated cardboard sheet 17 printing plate 18 plate cylinder 19 impression cylinder 21 ink transfer roll 22 squeezing roll (ink amount adjusting member) 28 supply / recovery device 50 dam member 53 diluent liquid supply pipe (diluent liquid supply means) 54 cover body 55 ink amount Detecting means 56 Scraper 58 Adjusting plate (ink amount adjusting member) 60 Scraper 70 Cooling water (cooling means) A Ink storing section

Claims (7)

[Claims] 1. A plate cylinder (18) on which a printing plate (17) is mounted, an impression cylinder (19) arranged opposite to the plate cylinder (18), and a plate cylinder (18) which can be freely moved toward and away from the plate cylinder (18). The plate cylinder (18)
The ink transfer roll (21), which rotates in contact with the printing plate (17) mounted on the ink transfer roll (21), is always in contact with the ink transfer roll (21) during operation, and the ink amount adjusting member (2) controls the squeezing of the ink amount.
2) the cardboard sheet printing machine comprising: the ink transfer roll (21) and an ink amount adjusting member (22)
Weir members (50, 50) located at both ends in the axial direction of the ink storage unit (A) defined between the transfer roll (21) and the adjustment member (22). ), The ink transfer roll (21) and an ink amount adjusting member (22)
And a supply / collection device which is movable above the ink storage portion (A) in the longitudinal direction of the ink storage portion (A) and selectively supplies the flexographic ink to the storage portion (A) and recovers the residual ink.
(28), the ink amount adjusting member (22) or the ink transfer roll (21)
The adjusting member (2
2) or a scraper (56, 60) for scraping and removing the flexo ink transferred to the transfer roll (21), and a cooling means for suppressing a rise in the temperature of the flexographic ink stored in the ink storage section (A) ( 70). A printing machine for corrugated cardboard sheets, comprising: 2. A liquid (70) as a cooling means is filled in the ink transfer roll (21), and the liquid (70) suppresses heat generation in the ink transfer roll (21), thereby forming a flexographic ink. 2. The corrugated cardboard sheet printing machine according to claim 1, wherein the temperature rise is suppressed. 3. The printing for a corrugated cardboard sheet according to claim 1, wherein a diluting liquid supplying means (53) for supplying a diluting liquid to the storing section (A) is provided above the ink storing section (A). Machine. 4. An ink amount detecting means (55) for detecting an amount of stored flexographic ink in the ink storing section (A), and the supply / recovery device (5) is provided based on a value detected by the detecting means (55). 28) By controlling 28), a required amount of flexographic ink is always stored in the ink storing section (A).
A printing machine for corrugated cardboard sheets according to any one of the above. 5. The ink storage section (A) is surrounded by a cover body (54) so as to suppress the influence of an external atmosphere on the flexo ink stored in the storage section (A). The printing machine for corrugated cardboard sheets according to any one of claims 1 to 4. 6. A plate cylinder (18) on which a printing plate (17) is mounted, an impression cylinder (19) arranged opposite to the plate cylinder (18), and a plate cylinder (18) which can be freely moved toward and away from the plate cylinder (18). The plate cylinder (18)
The ink transfer roll (21), which rotates in contact with the printing plate (17) mounted on the ink transfer roll (21), is always in contact with the ink transfer roll (21) during operation, and the ink amount adjusting member (2) controls the squeezing of the ink amount.
2) the cardboard sheet printing machine comprising: the ink transfer roll (21) and an ink amount adjusting member (22)
While the longitudinal ends of the ink reservoir (A) defined between them are closed by dam members (50, 50), the ink reservoir (A)
A non-circulating supply of flexographic ink to the ink storage unit (A) from a supply / recovery device (28) which is disposed above the storage unit (A) and is movable in the longitudinal direction of the storage unit (A) supplies the ink. Flexo ink stored in the ink storage section (A) is transferred to the printing plate (17) via the ink transfer roll (21), and the plate cylinder ( 18)
And a corrugated cardboard sheet (12) between the impression cylinder (19) and
The required printing is performed on the sheet (12). During this printing operation, the temperature rise of the flexographic ink stored in the ink storing section (A) is suppressed by the cooling means (70), and the color accompanying the order change is reduced. When replacing, the ink storage unit
Flexo ink remaining in (A) is recovered by the supply / recovery device (28), and then a cleaning liquid is supplied between the ink transfer roll (21) and the ink amount adjusting member (22). Ink amount adjusting member (2
2) Or a scraper (56, 60) is brought into contact with the ink transfer roll (21) to scrape off the washing waste liquid by the scraper (56, 60). Method. 7. After the flexo ink remaining in the ink storage section (A) is recovered by the supply / recovery device (28), the ink amount adjusting member (22) and the ink transfer roll
While rotating (21) in contact, the scraper (56, 60) is brought into contact with the ink amount adjusting member (22) or the ink transfer roll (21) to scrape the flexo ink with the scraper (56, 60). To remove the flexo ink remaining between the ink transfer roll (21) and the ink amount adjusting member (22),
7. The method according to claim 6, wherein the cleaning liquid is supplied thereafter.