JP3053666U - Printer - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To suppress the amount of waste ink and waste liquid generated due to a change in print order and the like, and to perform collection / cleaning work in a short time. SOLUTION: An ink transfer roll 17 and a squeezing roll 18 are provided.
An ink pot 36 for storing flexographic ink is mounted on a mounting plate 35 movably disposed above an ink storage section A defined between the ink storage sections A. In addition, supply of the flexo ink to the ink storage section A or the storage section A
A first ink supply / recovery device 25 and a second ink supply / recovery device 26 for selectively recovering the flexo ink stored in the printer are provided. By driving the two devices 25 and 26 in opposite directions, the flexo ink in the ink pot 36 is supplied to the ink storage section A, and the flexo ink stored in the storage section A is supplied to the ink pot 36. A cycle of recovery is performed.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a printing press, and more particularly, to a printing press capable of suppressing the amount of ink that is wastefully discarded due to a change in a print order.

[0002]

[Prior art]

 A flexographic printing press used for printing a corrugated cardboard sheet is, for example, as disclosed in Japanese Utility Model Unexamined Publication No. 4-87244, in which a flexo roll supplied between a rotatable ink roll and a squeezing roll is used. The ink is transferred to the printing plate mounted on the plate cylinder via an ink roll. Since the flexographic ink used in this flexographic printing machine is highly quick-drying, it must be constantly circulated to prevent drying and solidification. Therefore, in the printing press, the ink in the ink tank is supplied between the two rolls via a pump and a supply pipe, and the ink retained in the ink tank is supplied from both ends of the two rolls to the gutter member and the collection pipe. A circulation mechanism for recovering the oil through the tank is employed.

[0003]

[Problems to be solved by the invention]

 In the above-mentioned conventional flexographic printing press, an ink tank is installed below the operation side (one end of both rolls in the axial direction) of the printing press from the viewpoint of easily changing colors according to a change in print order. . For this reason, the length of the supply pipe extending from the ink tank to approximately the center in the axial direction above the two rolls is long. Also, since the ink that stagnates between the rolls and flows out from both ends is received by the gutter members provided at both ends, the length of the collection pipe that runs from both gutter members to the ink tank also becomes longer. That is the current situation.

[0004] Recently, 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 been remarkable over the years. Considering this with respect to a printing press, 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, as described above, in conventional flexographic printing presses that have a long ink circulation system, it is necessary to wash the rolls and circulation system with a large amount of water when changing colors, and complete recovery of the ink is impossible without considerable loss. In addition to this, there is a problem that the cost of the treatment is increased due to the necessity of a cleaning waste liquid treatment facility from the viewpoint of pollution prevention measures. In addition, since it takes time to change colors, the amount of lost time has increased, leading to a decrease in production efficiency.

[0005]

[Purpose of the invention]

 In view of the above-mentioned drawbacks inherent in the conventional technology, this device has been proposed to solve the problem in a favorable manner. It is an object of the present invention to provide a printing press capable of suppressing the amount of waste liquid generated and performing collection and washing operations in a short time.

[0006]

[Means for Solving the Problems]

 In order to overcome the above problems and appropriately achieve the intended purpose, a printing press according to the present invention includes a plate cylinder equipped with a printing plate, and an impression cylinder arranged opposite to the plate cylinder. A printing press configured to transfer a corrugated sheet between the plate cylinder and the impression cylinder rotating in opposite directions to each other, and to perform required printing on the sheet. An ink transfer roll which rotates in contact with the printing plate of the plate cylinder; an adjusting means for adjusting the squeezing of the ink amount by contacting the ink transfer roll during printing; and both axial sides of the ink transfer roll and the adjusting means. And a pair of regulating members that define an ink storage section between the ink transfer roll and the adjustment means, and are arranged in close proximity to the ink storage section and are used for ink supply and recovery. A collection source; A first pipe body and a second pipe body having one opening inserted into the ink supply / recovery source and the other opening facing the ink storage unit, wherein the first tube and the second tube are provided. Each of the bodies is equipped with ink transfer means.

[0007]

[Embodiment of the invention]

 Next, the printing press according to the present invention will be described below with reference to the accompanying drawings by way of preferred embodiments. FIG. 1 is a schematic side view showing a state in which a flexographic printing press according to an embodiment prints on a corrugated cardboard sheet. The illustrated flexographic printing press 10 has a predetermined interval in a direction intersecting a feeding direction of a corrugated cardboard sheet 11. A printing cylinder 13, which is removably mounted between the machine frames 12 and 12 (only some of which are shown), is disposed above the pass line of the cardboard sheet 11, and a pass line of the cardboard sheet 11. The plate cylinder 14 and the impression cylinder 15 are rotatable in opposite directions to each other.

An ink transfer mechanism 16 for transferring flexographic ink to the printing plate 13 is provided above the plate cylinder 14. The ink transfer mechanism 16 includes an ink transfer roll 17 for directly transferring the supplied flexographic ink to the printing plate 13, a squeeze roll 18 as an adjusting means which is pressed against the roll 17 to adjust the amount of ink, and a squeeze. It basically comprises a swing mechanism 19 that can displace the ink transfer roll 17 within a required angle range around the rotation axis of the roll 18. By selectively operating the oscillating mechanism 19, the ink transfer roll 17 is brought into contact with the printing plate 13 to transfer the flexographic ink to the printing plate 13, as will be described later. It can be displaced from the plate 13 to an ink washing position where ink transfer is disabled.

That is, the ink transfer roll 17 is disposed so as to be able to approach and separate from the plate cylinder 14, and is rotatable in contact with the printing plate 13 mounted on the plate cylinder 14 when approaching. Anilox is formed on the surface of the ink transfer roll 17 by forming fine recesses in a required pattern, and these fine recesses store a fixed amount of flexographic ink and prevent ink scattering during rotation of the roll. It is functioning. Although an iron-based metal material is used for the ink transfer roll 17, a ceramic coating may be formed on the surface of the metal roll by explosive spraying or the like, and an anilox may be engraved on the ceramic coating. Further, as the ink transfer roll 17, an iron roll without engraving anilox (plated only) or a simple rubber roll can be suitably used.

The squeezing roll 18 disposed adjacent to the ink transfer roll 17 is always in contact with the ink transfer roll 17 during operation, and rotates at a lower speed than the ink transfer roll 17, thereby rotating the ink transfer roll 17. It functions to adjust the excess ink on the surface of the surface. The squeezing roll 18 is preferably made of a flexible material such as an iron-based metal material or 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.

In the ink transfer mechanism 16 including the ink transfer roll 17 and the squeezing roll 18, the swing mechanism 19 that can displace the ink transfer roll 17 in a required angle range around the rotation axis of the squeezing roll 18 is provided. Have been. That is, support brackets 20, 20 (only one is shown) are rotatably supported at both shaft ends of the squeezing roll 18 rotatably disposed on the machine frames 12, 12, facing the inside of the machine frame 12. An ink transfer roll 17 is rotatably supported between the support brackets 20,20. A piston rod 21a of an air cylinder 21 whose one end is pivotally supported by the corresponding machine frame 12 is rotatably connected to the upper end of each support bracket 20 on the side where the ink transfer roll 17 is pivotally supported. By urging the pair of air cylinders 21 and 21 in synchronization, the ink transfer roll 17 is brought into contact with the printing plate 13 to transfer the flexo ink, and the ink transfer roll 17 is separated from the printing plate 13 to flexographically transfer the ink. It is configured so that it can be selectively located at the ink washing position where ink transfer is disabled. The swinging mechanism 19 detects whether or not the corrugated cardboard sheet 11 is passed between the plate cylinder 14 and the impression cylinder 15 by an appropriate detecting means (not shown), and the sheet 11 is passed through. When paper is not printed, the ink transfer roll 17 is set to be automatically separated from the printing plate 13. Further, a mechanism for giving different rotations to the two rolls 17 and 18 is known per se, and a description thereof will be omitted.

A stopper bolt 22 is provided at a lower end of each of the support brackets 20, and an adjustment shaft 23 is rotatably supported between machine frames 12, 12 facing below the support brackets 20, 20. When the transfer roll 17 is positioned at the ink transfer position, each of the stopper bolts 22 is configured to abut on a corresponding eccentric ring 24 eccentrically disposed on the adjustment shaft 23. The adjusting shaft 23 is rotated by operating means such as a motor or an air cylinder (not shown), and the operating means rotates the eccentric wheels 24 and 24 at a required center angle to thereby transfer ink. The position of the ink transfer roll 17 at the position can be finely adjusted.

The ink transfer roll 17 and the squeezing roll 18 are configured such that, when the two rolls 17 and 18 are pressed against each other, an ink reservoir A can be defined in a contact area in the longitudinal direction of the two rolls. . The ink supply / recovery devices 25 and 26 functioning as two ink transfer means for selectively supplying the flexo ink to the ink storage section A or recovering the flexo ink stored in the storage section A are provided by: The rolls 17 and 18 are disposed close to and above the rolls 17 and 18. In the embodiment, each of the ink supply / recovery devices 25 and 26 is configured to also serve as an ink supply unit and an ink recovery unit.

The ink supply / recovery devices 25 and 26 of the embodiment are movably disposed over the entire width of the ink storage section A (the entire axial length of the two rolls 17 and 18). First, a description will be given. A horizontal girder 27 parallel to the ink transfer roll 17 and the squeezing roll 18 is installed between the upper ends of the machine frames 12, 12, and a guide rail 28 formed on the upper surface of the horizontal girder 27 as shown in FIG. A movable table 30 is supported movably via rollers 29,29. A pair of sprockets 31, 31 (only one is shown) are rotatably supported on the cross beam 27 by a predetermined distance in the longitudinal direction, and one sprocket 31 is rotated forward and reverse by a drive motor 32. It is configured as follows. An endless chain 33 is wound between the two sprockets 31, and a required portion of the endless chain 33 is fixed to the movable table 30. Therefore, by moving the endless chain 33 by urging the drive motor 32 in the forward and reverse directions, the movable table 30 reciprocates along the guide rail 28 as the chain 33 travels. Further, the drive motor 32 controls the rotation direction to be switched under the condition that one of a pair of position sensors (not shown) arranged apart in the moving direction of the moving base 30 detects the moving base 30. The movable table 30 is configured to reciprocate in a required area in the width direction of the ink storage section A. The rotation direction of the motor 32 may be controlled based on a signal from a rotation detector such as an encoder provided in the rotation system of the drive motor 32 to define the reciprocating range of the movable table 30. .

As shown in FIG. 2, a pair of brackets 34, 34 which are separated from each other in the moving direction of the moving table 30 hang down above the squeezing roll 18 and are mounted on the lower end of the moving table 30. The plate 35 is disposed horizontally. An ink pot 36 serving as an ink supply / recovery source used for supplying and recovering ink storing a predetermined amount of flexo ink is removably mounted on a mounting plate facing between the brackets 34, 34. The color change accompanying the order change can be handled by replacing the ink pot 36. Further, in the cleaning operation accompanying the color change, a cleaning liquid pot for storing the cleaning liquid (water) is mounted on the mounting plate, and the ink transfer rolls 17 and the cleaning liquid stored in the cleaning liquid pot are used as described later. The squeezing roll 18 is configured to be washed. Guide rollers 37, 37 are rotatably supported on the bottom surface of the mounting plate 35, and the guide rollers 37, 37 are slidably movable on guides 38 provided in parallel with the rolls 17, 18. The moving table 30 and the mounting plate 35 are configured to be able to move smoothly.

A first ink supply / recovery device 25 is provided on a mounting plate 35 extending outward from the one (right side in FIG. 2) bracket 34. The first ink supply / collection device 25 includes a first tubing pump 39 and a first reversible motor 40 for driving the pump 39. The first tubing pump 39 has a flexible first tube (first tube). One tube 41 is detachably inserted. One opening 41a of the first tube 41 is immersed in the flexo ink stored in the ink pot 36, and the other opening 41b is mounted on the first holder 42 to store the ink. I'm facing department A. The first holder 42 is moved up and down between a raised position and a lowered position by a first raising and lowering device 43 arranged on the mounting plate 35, and in the raised position, the first holder 42 is moved by liquid level sensors 44, 44 described later. It is set so that the other opening 41b of the first tube 41 is immersed in a flexo ink in which the liquid level stored in the ink storing section A is defined. When the first holder 42 is in the lowered position, the other opening 41b of the first tube 41 is made to face the bottom of the ink storing section A so that the remaining flexo ink can be collected to the maximum. I have.

A second ink supply / recovery device 26 is provided on a mounting plate 35 extending outward from the other (left side in FIG. 2) bracket 34. The second ink supply / recovery device 26 has the same configuration as the first ink supply / recovery device 25, and includes a second tubing pump 45 and a second reversible motor 46 for driving the pump 45. One opening 47a of a flexible second tube (second tube) 47 detachably inserted in the second tubing pump 45 is immersed in the flexo ink stored in the ink pot 36. The other opening 47b is attached to the second holder 48 and faces the ink storing section A. Similarly to the first holder 42, the second holder 48 is also moved up and down between a raised position and a lowered position by a second lifting device 49 provided on the mounting plate 35, and the other of the second tube 47 is moved. The opening 47b of the ink storage unit A can be exposed to a position where the opening 47b is immersed in the flexo ink or the bottom of the ink storage unit A. As described above, in the embodiment, since the two devices 25 and 26 have both functions of ink supply and ink recovery, the other openings 41b and 41b of the tubes 41 and 47 of the devices 25 and 26, respectively. 47b function as a supply port for ink supply and a recovery port for ink recovery, respectively.

Since the basic structure of the first and second tubing pumps 39 and 45 is known, the first tubing pump 39 will be described. The first tube is formed by a plurality of rollers 50 moving along a predetermined track. By squeezing 41, the flexo ink in the tube is extruded in a predetermined direction. When the first reversible motor 40 is driven to rotate forward and the roller 50 of the first tubing pump 39 is rotated clockwise in FIGS. 2 and 4, the flexo ink in the first tube 41 is supplied to the other opening. The ink is extruded to the side 41b, whereby the flexo ink of the ink pot 36 is supplied to the ink storage section A. When the first reversible motor 40 is driven in reverse to rotate the roller 50 in a counterclockwise direction, the flexographic ink in the first tube 41 is pushed out to one of the openings 41a, whereby the flexographic ink in the ink storage section A is moved. Can be collected in the ink pot 36. In the second tubing pump 45, when the second reversible motor 46 is driven to rotate forward and the roller 50 is rotated in the clockwise direction, the flexo ink in the ink storage section A is collected in the ink pot 36, and the second reversible ink is recovered. When the motor 46 is driven in the reverse direction to rotate the roller 50 in the counterclockwise direction, the flexo ink in the ink pot 36 is supplied to the ink storing section A.

That is, by driving the first and second reversible motors 40 and 46 in opposite directions, the flexo ink in the ink pot 36 is stored in the ink reservoir A by the first tubing pump 39 or the second tubing pump 45. While being supplied, the flexo ink stored in the storage section A is circulated in the ink pot 36 by the second tubing pump 45 or the first tubing pump 39, so that a highly quick-drying flexo ink is obtained. It is designed to prevent drying and solidification. Further, if the reversible motors 40 and 46 are driven while moving the movable base 30 in the left and right directions by the driving motor 32, the supply and the recovery of the flexographic ink are performed over the entire width of the ink storing section A. The circulation of the entire flexographic ink stored in the storage section A is efficiently achieved. In the embodiment, the driving direction of the first and second reversible motors 40 and 46 is selected according to the moving direction of the moving table 30. For example, in FIG. 4, when the moving table 30 moves to the left (the direction in which the second ink supply / collection device 26 is on the forward side), the first ink supply / collection device 25 supplies ink and When the ink is collected by the second ink supply / collection device 26 and the moving table 30 is moved rightward (the direction where the first ink supply / collection device 25 is on the forward side), the first ink supply / collection device is used. It is set so that ink is collected at 25 and ink is supplied at the second ink supply / collection device 26. That is, when one of the first tubes 41 functions as an ink supply tube, the other second tube 47 functions as an ink collection tube, and conversely, the first tube 41 functions as an ink collection tube. In this case, the second tube 47 is configured to function as an ink supply tube. The first reversible motor 40 and the second reversible motor 46 are set to have a higher capacity (rotation speed) during ink supply than during ink recovery. The ink is configured to be stored.

As shown in FIG. 1, an air cylinder 52 is disposed on each of the support brackets 20 via a support member 51, and a plate-shaped regulating member 53 is provided on a piston rod 52 a of the air cylinder 52. It can be moved up and down. Then, the regulating member 53 is lowered by the urging of the air cylinders 52 so as to be brought into close contact with the axial ends of the ink transfer roll 17 and the squeezing roll 18 as shown in FIG. The ink storage section A to be defined is closed, and the flexo ink supplied from the ink supply / recovery devices 25 and 26 can be stored in the storage section A. Further, a gutter member 54 is provided below both ends in the axial direction of the ink transfer roll 17 and the squeezing roll 18. During the cleaning operation, the regulating member 53 is raised by the reverse bias of the air cylinder 52 to move the ink reservoir A. When opened, the cleaning liquid flowing out of the storage section A is received by the gutter member 54 and collected in an ink pan 55 described later.

Liquid level sensors 44, 44 for detecting the liquid level (liquid level) of the flexographic ink stored in the storage section A during the printing operation are disposed above the vicinity of both ends in the width direction of the ink storage section A. The operation of the first and second ink supply / recovery devices 25, 26 is controlled in accordance with the detection conditions of the sensors 44, 44, so that a fixed amount of flexo ink is always stored in the ink storage section A. .

At a substantially tangential position close to the squeezing roll 18, a scraper 56 composed of a long blade-shaped plate for washing the flexographic ink when changing colors by changing the order or the like is arranged. ing. The tip of the scraper 56 is directed along the tangential direction in a direction opposite to the rotation direction of the squeezing roll 18. The scraper 56 is swung in the forward and reverse directions by an air cylinder 57 to freely contact and separate from the roll surface. Has become. In the cleaning operation, the air cylinder 57 is urged to bring the scraper 56 into contact with the squeezing roll 18, whereby the cleaning liquid transferred to the roll 18 is scraped up and removed. The removed cleaning liquid is discharged to an ink pan 55 provided below the scraper 56. A waste liquid pipe 58 communicating with a waste liquid tank (not shown) is connected to the ink pan 55, and the waste liquid discharged to the ink pan 55 is collected in a waste liquid tank provided at a required portion. During the washing operation, the ink transfer roll 17 is displaced around the rotation axis of the squeezing roll 18 by the swinging mechanism 19 provided in association with the ink transfer mechanism 16, and the ink separated from the printing plate 13. The setting is made so as to face the cleaning position.

[0023]

Operation of the embodiment

 Next, the operation of the flexographic printing press according to the above configuration will be described. During the printing operation, the regulating members 53, 53 provided at both axial ends of the ink transfer roll 17 and the squeezing roll 18 are at the lowered position, and close both longitudinal ends of the ink storage section A. Has formed. The moving table 30 is located on the right end side of the ink storage section A, and the first and second holders 42, 48 of the first and second ink supply / recovery devices 25, 26 are associated with corresponding lifting / lowering devices. The other opening portions 41b and 47b of the first and second tubes 41 and 47 are positioned at positions where they can be immersed in the flexo ink stored in the ink storing portion A, respectively. I'm facing you. The openings 41a and 47a of the first and second tubes 41 and 47 are immersed in the flexo ink stored in the ink pot 36 mounted on the mounting plate 35.

In this state, the drive motor 32 is rotated in a required direction to move the movable table 30 to the left, and the first reversible motor 40 and the second reversible motor 46 are respectively driven to rotate in the normal rotation direction. In this case, the roller 50 of the first tubing pump 39 rotates clockwise, squeezes the first tube 41 and pushes the internal flexographic ink toward the other opening 41b. That is, due to the continuous ironing of the first tube 41 by the roller 50, the flexo ink in the ink pot 36 passes through the first tube 41 between the rotating ink transfer roll 17 and the squeezing roll 18 (ink). It is supplied to the storage section A). This flexographic ink is stored in a state where it is regulated by regulating members 53, 53 facing the shaft ends of both rolls 17, 18. Further, the roller 50 of the second tubing pump 45 rotates clockwise, squeezes the second tube 47 and pushes the internal flexo ink toward the one opening 47a. That is, due to the continuous squeezing of the second tube 47 by the roller 50, the flexo ink supplied and stored from the first ink supply / recovery device 25 to the ink storage unit A passes through the second tube 47. The ink is collected in the ink pot 36.

As described above, while the first ink supply / recovery device 25 supplies the flexographic ink to the ink reservoir A, the flexo ink stored in the reservoir A is supplied to the ink pot 36 by the second ink supply / recovery device 26. , The flexo ink in the ink storage section A is circulated. As a result, the drying and solidification of the highly quick-drying flexo ink is reliably prevented. As described above, the rotation of the first and second reversible motors 40 and 46 is controlled so that the ink supply amount is set to be larger than the ink recovery amount. Flexo ink is stored.

When the movable base 30 is detected by the left position sensor, the drive motor 32 is rotated in the reverse direction to move the movable base 30 rightward, and the first reversible motor 40 and the second reversible motor 46 are driven to rotate in the reverse direction. In this case, the flexo ink stored in the ink storage section A by the first tubing pump 39 is collected in the ink pot 36 via the first tube 41, and the ink tub 36 is recovered by the second tubing pump 45. The flexo ink inside is supplied to the ink storage section A via the second tube 47.

In a state where the flexo ink is stored in the ink storage section A, when the corrugated paperboard sheets 11 are supplied one by one from the upstream stocker (not shown) between the plate cylinder 14 and the impression cylinder 15, The oscillating mechanism 19 is activated by sheet detection by an appropriate detecting means, and the ink transfer roll 17 of the ink transfer mechanism 16 comes into contact with the plate cylinder 14 (printing plate 13), and an appropriate amount of flexographic ink is applied to the surface of the printing plate 13. Is transferred, and the required printing is performed on the sheet 11. Since flexographic inks are highly quick-drying, they can be immediately sent to a post-process die cutter or folder glue after printing. In addition, since the flexo ink spreads over the entire area between the ink transfer roll 17 and the squeezing roll 18, color unevenness in the width direction does not occur at the time of printing, so that the operator does not need to constantly monitor the printing state.

When the flexo ink to be used is changed for color change accompanying a change in print order, etc., ink collection and washing are performed in the following procedure. At the time when the printing operation is completed and the cardboard sheet 11 is no longer passed between the plate cylinder 14 and the impression cylinder 15, the ink transfer roll 17 of the ink transfer mechanism 16 is moved by the swing mechanism 19. The printing plate has been moved to the ink washing position which is separated from the plate cylinder 14 (printing plate 13). First, while the rotation of the ink transfer roll 17 and the squeezing roll 18 is stopped, the first and second holders 42 and 48 are lowered to the lowered position, and the other of the first and second tubes 41 and 47 is stopped. Opening portions 41b and 47b face the bottom of the ink storing portion A, respectively. Then, the first reversible motor 40 is driven to rotate in the reverse direction, and the second reversible motor 46 is driven to rotate in the forward direction, so that the flexo ink stored in the ink storage section A is collected in the ink pot 36 via both tubes 41 and 47. I do. At this time, the moving table 30 is moved in the left-right direction, and the other openings 41b, 47b of the tubes 41, 47 are exposed to the entire width of the ink storage section A, so that the flexographic ink can be recovered in a short time. can do. That is, the flexo ink remaining in the ink storage section A without being used can be efficiently collected, and the ink can be prevented from being wasted.

Next, the ink pot 36 in which the unused flexo ink has been collected is replaced with a cleaning liquid pot in which the cleaning liquid is stored, and one opening 41a of both tubes 41 and 47 is provided inside the pot. , 47a to be immersed in the cleaning solution. Further, the air cylinder 57 is urged to bring the scraper 56 into contact with the squeezing roll 18 at an appropriate pressure, and the two regulating members 53, 53 are raised by the reverse urging of the air cylinders 52, 52 to store the ink. Open part A. Then, while the ink transfer roll 17 and the squeezing roll 18 are idly rotated at the same peripheral speed, and while the movable table 30 is moved in the left-right direction, the cleaning liquid in the cleaning liquid pot is discharged by both the ink supply / recovery devices 25 and 26. The ink is supplied to the ink storage section A. As a result, the cleaning liquid supplied to the ink storage section A and cleaning the flexo ink adhering to the two rolls 17 and 18 flows out from both ends in the width direction of the storage section A and flows through the gutter members 54 and 54 to form the ink pan. The cleaning liquid adhering to the surface of the squeezing roll 18 is scraped off and removed by the scraper 56 while being discharged to the ink pan 55, and the cleaning liquid is discharged to the ink pan 55. By supplying the cleaning liquid in the cleaning liquid pot to the ink reservoir A by the ink supply / recovery devices 25 and 26, the tubes 41 and 47 (the flexo ink circulation system) are also cleaned at the same time. Further, in the cleaning operation, the cleaning liquid may be supplied at a fixed position (for example, substantially at the center in the axial direction of both rolls 17 and 18) without moving the movable table 30.

After the above-described cleaning operation is completed, the cleaning liquid pot mounted on the mounting plate 35 is replaced with an ink pot 36 storing flexographic ink according to a new order, and the first and second tubes are replaced. The color change is completed by dipping one of the openings 41a and 47a in the ink pot 36 into the flexo ink.

In the flexographic printing press of the embodiment, the ink supply and the ink recovery are performed simultaneously by the two ink supply / recovery devices 25 and 26 disposed above and adjacent to the ink storage section A, so that the ink is supplied. The highly quick-drying flexo ink stored in the storage section A can be constantly circulated to prevent drying and solidification. Moreover, since the ink pot 36 and the ink reservoir A are close to each other, the length of the two tubes 41 and 47 constituting the ink circulation system is short, and the ink remaining in the tubes 41 and 47 remains. And the tubing pumps 39, 45 themselves do not need to be cleaned, so that ink loss can be reduced. Further, since the ink circulation system is short, the cleaning can be performed in a short time, 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. The amount of cleaning liquid used for ink cleaning was about 60 liters in the conventional flexographic printing press, but was only about 2 liters in the printing press. It can greatly contribute to pollution prevention.

In the embodiment, the first ink supply / recovery device 25 and the second ink supply / recovery device 26 have both been described as performing ink supply and ink recovery. A dedicated machine may be used, and the other device may be a machine dedicated to ink recovery. As a means for supplying the cleaning liquid to the ink storage section A during the cleaning operation, a cleaning liquid supply pipe connected to the cleaning liquid supply source and disposed toward the ink storage section A without using the cleaning liquid pot as described above. It can be used. However, in this case, since the tubes 41 and 47 in the ink supply / recovery devices 25 and 26 cannot be washed at the same time, the tubes 41 and 47 are washed outside together with the replacement of the ink pot 36, or another Need to be replaced with tube. Further, it is also possible to dispose the cleaning liquid supply pipe on the mounting plate 35, and to move the movable table 30 in the left and right directions when supplying the cleaning liquid, thereby quickly supplying the cleaning liquid to the entire ink storage section A. .

Further, a compressed air outlet is provided on the mounting table 35, and the cleaning liquid remaining in the ink storage section A is removed by the compressed air blown out from the outlet while moving the movable table 30 in the left-right direction. It can also be moved to the shaft end side and discharged to the gutter members 54, 54. In this case, the cleaning operation can be performed in a shorter time, which is preferable. The adjusting means for adjusting the amount of ink to the ink transfer roll is not limited to the squeezing roll of the embodiment, and the tip of the adjustment plate formed of a long plate is attached to the ink transfer roll with respect to the ink transfer roll. It is possible to adopt a configuration in which the ink amount on the surface of the ink transfer roll is adjusted by directing the ink in the forward direction with respect to the rotation direction and adjusting the distance between the tip of the adjusting plate and the roll surface.

[0034]

[About another embodiment]

 FIGS. 5 to 8 are schematic views respectively showing another embodiment of the ink supply / collection mechanism in the flexographic printing press, and the basic configuration thereof is the same as that described with reference to FIGS. Therefore, only different parts will be described. Also, the same members are given the same reference numerals.

[0035]

First Alternative Embodiment In a first alternative embodiment shown in FIG. 5, one ink supply / collection device 25 (for example, a first ink supply / collection device, which functions as ink supply means) ) Is arranged so that only the operation of supplying the flexo ink in the ink pot 36 to the ink storage section A is performed by the ink supply / recovery device 25 during the printing operation. Further, one opening 59b of the collection tube (second tube) 59 is inserted into the ink pot 36, and the other opening 59a of the tube 59 is connected to the one (ink ink 36 with the ink pot 36 therebetween). It is configured to be inserted into a required portion of the regulating member 53 (on the side opposite to the side where the supply / recovery device 25 is disposed) and to face the ink reservoir A. The collection tube 59 is inserted into a collection tubing pump 60 disposed at a predetermined position of the machine frame 12, and the pump 60 is driven by a motor 67 in a required direction, so that the collection tube A is stored in the ink storage section A. The stored flexo ink is collected in the ink pot 36 via a collection tube 59. That is, in the first alternative embodiment, an ink collection device (ink transfer device) 68 as ink collection means is constituted by the collection tube 59, the collection tubing pump 60, and the motor 67.

In the first alternative embodiment, the flexo ink in the ink pot 36 is supplied to the ink reservoir A by the ink supply / recovery device 25, and the flexo ink in the reservoir A is supplied to the ink recovery device 68 at the same time. The flexo ink is circulated by collecting the ink in the ink pot 36 through the collection tube 59. In this alternative example, it is not essential to move the ink supply / recovery device 25 (moving table 30) in the left-right direction during the printing operation, and it is sufficient to supply the fixo ink at a fixed position. In the cleaning operation, the flexo ink may be collected by driving only the ink collection device 68 while the operation of the ink supply / collection device 25 is stopped, or the ink supply / collection device 25 may be driven in reverse. Thus, it is also possible for the apparatus 25 to collect the ink in parallel. The washing operation can be performed in the same manner as in the above-described embodiment.

[0037]

[Second Alternative Embodiment] In a second alternative embodiment shown in FIG. 6, the first ink supply / collection device 25 and the second ink supply / collection device 26 are configured to exclusively perform ink collection only during a printing operation. ing. An ink tank (ink supply / recovery source) 61 for storing a required amount of flexo ink is mounted on the mounting portion of the mounting plate 35 where the ink pot is mounted, and is connected to the bottom of the tank 61 to store the ink. An opening (supply port) 62 a of the supply pipe (tube) 62 facing above A is configured to be openable and closable via a solenoid valve 63. That is, in this alternative embodiment, the supply pipe 62 and the solenoid valve 63 constitute an ink supply device 69 as ink supply means. The ink tank 61 is located at the upper center in the width direction of the ink storage section A, and the other openings 41b, 47b functioning as collection ports of the tubes 41, 47 of the ink supply / collection devices 25, 26 are The ink storage section A is set so as to face near the corresponding end in the width direction. In the second embodiment, both ink supply / recovery devices 25 and 26 function as ink recovery means.

In the second alternative embodiment, the opening 62 a of the supply pipe 62 is opened by the solenoid valve 63 of the ink supply device 69 during the printing operation, and the flexo ink is supplied from the ink tank 61 to the ink storage section A. At the same time, the flexographic ink in the storage section A is collected in the ink tank 61 by the two ink supply / recovery devices 25 and 26, thereby circulating the flexographic ink. In this alternative example, the flexo ink is collected at a fixed position without moving the ink supply / collection devices 25 and 26 in the left and right directions during the printing operation. At the time of the recovery / washing operation, the opening 62a of the supply pipe 62 is closed by the solenoid valve 63 of the ink supply device 69, so that the flexo ink in the ink reservoir A can be supplied to the two ink supply / recovery devices 25, 26 collects the ink in the ink tank 61. At the time of this ink recovery, the other openings 41b, 47b of the tubes 41, 47 are positioned at the lowered positions by the elevating devices 43, 49, respectively. In the cleaning operation in the second alternative embodiment, the ink tank 61 is replaced with a cleaning liquid tank in which the cleaning liquid is stored, and the cleaning liquid in the tank is supplied to the ink storage section A, or the cleaning liquid supply pipe connected to an external supply source. The cleaning is performed by supplying the cleaning liquid to the ink storage section A via the above.

[0039]

Third Embodiment A third embodiment shown in FIG. 7 has basically the same configuration as that of the second embodiment, and reciprocates the entire apparatus in the width direction of the ink storing section A. It is configured to supply and recover flexographic ink.

[0040]

Fourth Alternative Embodiment In a fourth alternative embodiment shown in FIG. 8, a single tubing pump 64, which is driven to rotate in a required direction by a motor 70 disposed on the mounting plate 35 of the moving mechanism, is provided. A flexible supply tube (first tube) 65 and a collection tube (second tube) 66 are commonly inserted. In this embodiment, an ink supply means is constituted by an operation device (ink transfer means) 71 comprising a motor 70 and a tubing pump 64 and a supply tube 65, and an ink collection means is constituted by the operation device 71 and a collection tube 66. Is configured. One opening 65a of the supply tube 65 is immersed in the flexo ink stored in the ink pot 36 mounted on the mounting plate 35, and the other opening 65b serving as a supply port is located above the ink storage portion A. Is facing. One opening 66b of the collection tube 66 faces the ink pot 36, and the other opening 66a serving as a collection port is immersed in the flexo ink stored in the ink storage section A. As shown in the drawing, when the tubing pump 64 is driven to rotate in one direction by the motor 70, the supply tube 65 and the collection tube 66 are inserted into the tubing pump 64 via the supply tube 65, as shown in FIG. The flexo ink in the ink pot 36 is supplied to the ink storage section A, and the flexo ink in the ink storage section A is collected in the ink pot 36 via the collection tube 66.

In the fourth alternative embodiment, the flexo ink in the ink pot 36 is supplied to the ink reservoir A through the supply tube 65 by rotating the tubing pump 64 in one direction during the printing operation. At the same time, the flexo ink in the ink reservoir A is collected in the ink pot 36 via the collection tube 66, and the flexo ink circulates. In the printing operation, the ink is supplied and collected while moving the movable table 30 in the left-right direction, so that the flexographic ink can be efficiently circulated over the entire width of the ink storing section A. In the recovery / cleaning operation in this alternative example, the movable table 30 is moved to the left and right while one opening 65a of the supply tube 65 is pulled up from the flexo ink of the ink pot 36 by appropriate means. If the tubing pump 64 is rotated in the same direction as the printing operation, the flexo ink in the ink storage section A is collected in the ink pot 36 by the collection tube 66. In the cleaning operation in the fourth alternative embodiment, only one opening 65a of the supply tube 65 is immersed in the cleaning liquid in the cleaning liquid pot while the ink pot 36 is replaced with the cleaning liquid pot in which the cleaning liquid is stored. By driving the pump 64, the cleaning liquid of the pot can be supplied to the ink storage section A.

[0042]

[About changes]

 In the printing press according to the embodiment and the other embodiment, it is assumed that a flexo ink that requires circulation is used, but the mechanism of the printing press does not need to circulate the ink, and has a low viscosity and a high speed. Printing can be performed using a dry glycol-based ink. For example, in the embodiment shown in FIGS. 1 to 4, an ink pot containing the glycol-based ink is mounted on a mounting plate, and for example, one opening of a first tube in a first ink supply / collection device is glycol-equipped. While immersing in the system ink, the other opening is exposed above the ink reservoir. In a printing operation with the second ink supply / collection device stopped, only the first ink supply / collection device is operated to supply glycol-based ink from the ink pot to the ink storage unit, and the collection / cleaning operation is performed. At this time, the glycol-based ink remaining in the ink storage section is collected in the ink pot by operating the first ink supply / collection device. Since this glycol-based ink does not require circulation, the ink required for conventional circulation can be omitted, the lot unit at the time of ink purchase can be reduced, and inventory costs can be reduced. Things. In such a configuration, the first tube of the first ink supply / recovery device also functions as the ink supply circuit and the ink recovery circuit.

Instead of the tubing pump employed in the ink supply / recovery device, a pump of a different type capable of forward / reverse biasing can be employed. For example, it is possible to employ a type in which the ink is supplied by setting the inside of the tank storing the flexo ink to a pressurized state, and the ink is recovered by setting the inside of the tank to a negative pressure.

[0044]

[Effect of the invention]

 As described above, according to the printing press of the present invention, the ink supply / recovery used for supplying and recovering the ink is provided near the ink reservoir defined between the ink transfer roll and the adjusting means. By arranging the sources, the ink circulation system can be shortened, and the amount of waste ink can be reduced to a very low level, resulting in significant savings of ink. In addition, since the ink circulation system is short, the amount of cleaning liquid during the cleaning operation can be reduced, and the amount of cleaning waste liquid is extremely small, which is extremely advantageous from the viewpoint of preventing pollution. Further, it is possible to shorten the washing time when changing colors due to a change in the print order, etc., and it is possible to suitably cope with various kinds of small lot printing.

[Brief description of the drawings]

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

FIG. 2 is a schematic front view of a main part showing an ink supply / recovery device in a flexographic printing press according to an embodiment.

FIG. 3 is a schematic perspective view of a main part showing an ink transfer mechanism in a flexographic printing press according to the embodiment.

FIG. 4 is a schematic configuration diagram of an ink supply / recovery device in a flexographic printing press according to an embodiment.

FIG. 5 is a schematic configuration diagram of an ink supply / recovery mechanism according to a first different embodiment.

FIG. 6 is a schematic configuration diagram of an ink supply / recovery mechanism according to a second alternative embodiment.

FIG. 7 is a schematic configuration diagram of an ink supply / recovery mechanism according to a third different embodiment.

FIG. 8 is a schematic configuration diagram of an ink supply / recovery mechanism according to a fourth different embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 corrugated cardboard 13 printing plate 14 plate cylinder 15 impression cylinder 17 ink transfer roll 18 squeezing roll (adjustment means) 25 first ink supply / recovery device (ink transfer means) 26 second ink supply / recovery device (ink transfer means) 36 Ink pot (ink supply / recovery source) 41 First tube (first tube) 41a One opening 41b The other opening 47 Second tube (second tube) 47a One opening 47b The other opening 53 Restriction member 59 Collection tube (second tube) 59a Opening of other side 59b One opening 61 Ink tank (ink supply / recovery source) 65 Supply tube (first tube) 65a One opening 65b The other Opening 66 Collection tube (second tube) 66a The other opening 66b One opening 68 Ink recovery device (ink transfer device) 71 Actuator (ink transfer device) A Ink storage section

Claims (2)

[Utility model registration claims] The printing plate (13) includes a plate cylinder (14) on which a printing plate (13) is mounted, and an impression cylinder (15) arranged opposite to the printing plate cylinder (14).
While transferring the ink to the corrugated cardboard sheet (11) between the plate cylinder (14) and the impression cylinder (15) rotating in opposite directions to each other.
And a printing press configured to perform required printing on the sheet (11), and an ink transfer roll (17) that rotates in contact with the printing plate (13) of the plate cylinder (14) during printing. An adjusting means (18) for adjusting the squeezing of the ink amount by contacting the ink transfer roll (17) at the time of printing; and ink adjusting rollers (17) arranged on both axial sides of the ink transfer roll (17) and the adjusting means (18). A pair of regulating members (53, 53) defining an ink reservoir (A) between the transfer roll (17) and the adjusting means (18)
And an ink supply / recovery source (36, 61) which is arranged in close proximity to the ink reservoir (A) and is shared for supplying and recovering ink.
And one opening (41a, 65) in the ink supply / recovery source (36, 61).
a, 47a, 59b, 66b) and the other opening (41
b, 65b, 47b, 59a, 66a) facing the ink reservoir (A).
A pipe (41, 65) and a second pipe (47, 59, 66), wherein each of the first pipe (41, 65) and the second pipe (47, 59, 66) has an ink. A printing machine comprising a transfer means (25, 26, 68, 71). 2. The first tube (41, 65) and the second tube (4).
7,59,66), at least the tube used for ink recovery
The printing press according to claim 1, wherein the openings (41b, 47b, 59a, 66a) of the (41, 47, 59, 66) are immersed in the ink stored in the ink storing section (A).