JP2534949B2 - Printing machine for corrugated sheet - Google Patents

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 more particularly, to a printing order when using a glycol-based ink having a low viscosity and a high quick-drying property, which is newly developed by the applicant. The present invention relates to a printing machine configured to collect ink of the old order that remains due to changes in the above, reduce the amount of ink that is wasted, and quickly change the ink.

[0002]

2. Description of the Related Art Generally, conventional corrugated board printing machines can be roughly classified into two types. That is, the vertical rotary printing press shown in FIG. 7 and the flexographic printing press shown in FIG. 8 have different configurations depending on the properties of the ink used, and have advantages and disadvantages as described below. They are in conflict.

First, the vertical rotary printing press will be described.
This name is given because the corrugated cardboard sheet is passed in the longitudinal direction at right angles to the step. However, at present, it is widely used in printers / slotters that print corrugated cardboard sheets horizontally and also perform processes such as slotting, and in the industry it is called a Prislo printing machine. I shall. This Prislo printing machine uses a glycol-based ink having a high viscosity, kneads the ink with many rubber rolls to make it uniform, and then transfers the ink to a printing plate mounted on a plate cylinder.
For example, FIG. 7 shows various roll groups of the Prislo printing machine,
Corrugated board sheet 16 is passed between plate cylinder 12 on which printing plate 10 is mounted and impression cylinder 14 that is arranged opposite to plate cylinder 12, and appropriate printing is performed. Further, the ink in the ink reservoir 20 is transferred to the printing plate 10 via the calling roll 22, the intermediary roll 24 and the series of transfer rolls 18.

The above-mentioned Prislo printing machine has its own advantages and disadvantages, which are listed below.
It can be said that these advantages and disadvantages are basically due to the use of a highly viscous glycol-based ink. <Advantages> (a) Since the printing is performed on the sheet surface in a raised form, the finish of printing has gloss. (B) Since the ink needs to be supplied only to the necessary portions of the printing plate, the ink consumption can be small (the ink is not circulated). (C) When changing colors, the ink on the roll is simply removed by scraping. Therefore, order change can be performed in a short time, and various small quantities of small lot printing can be supported. Also, unlike flexographic printing, which will be described later, there is almost no waste liquid from washing, so
There is no need to install a costly waste liquid treatment facility. <Disadvantages> (a) Glycol-based inks of recent years are mainly fast-drying inks, and in recent years, further improvements have been made to that extent. However, as compared with the flexographic printing described later, it takes a considerable time to dry after printing. Therefore, it cannot be directly connected to a die cutter, a folder gluer or the like in the subsequent process. (B) Since it is necessary to uniformly knead the high-viscosity ink, the rolls for transferring the ink are multi-staged and the mechanism becomes complicated. Further, when the rolls are worn, complicated work for adjusting the interval between the rolls is required. (C) When the ink is supplied, the amount of ink transferred to the sheet is large, so that the image is printed darkly, and as the ink is consumed, the amount of ink transferred to the sheet is decreased and the image is printed thinly, and therefore unevenness in printing is likely to occur. For this reason, the operator always needs to perform complicated operations such as monitoring the color density and lightness and supplying ink when the color becomes light.

Next, the flexographic printing machine uses a low-viscosity water-based ink which is rich in fluidity, unlike the Prislo printing machine, and has a characteristic that ink drying is extremely fast. For example, FIG. 8 schematically shows various roll groups of a flexographic printing machine, in which a corrugated cardboard sheet 16 is passed between a plate cylinder 12 on which a printing plate 10 is mounted and an impression cylinder 14 which is arranged to face the plate cylinder 12. Then, appropriate printing is performed. Also the plate cylinder 12
The ink roll 26 and the squeeze roll 28 are rotatably disposed in the vicinity of the ink roll 26, and the ink supplied between the two rolls 26, 28 is applied to the printing plate 10 of the plate cylinder 12 by the ink roll 26.
Is transferred through. Since flexo ink is highly quick-drying, it is necessary to constantly circulate it to prevent it from drying and solidifying, unlike the above-mentioned Prislo printing. Therefore, FIG.
As shown in FIG. 3, the ink in the tank 30 is supplied between the rolls 26 and 28 via the pump 32 and the supply pipe 34, and the ink accumulated in the ink is stored in the rolls 2 and 2.
From both ends of 6, 28, dams 36, 36 and recovery pipe 3
A circulation mechanism is used to collect the liquid in the tank 30 via

The advantages and disadvantages of the above flexographic printing machine are listed below. These advantages and disadvantages are also due to the properties of the ink used, i.e. low viscosity and highly quick-drying. <Advantages> (a) Since a quick-drying ink is used, it can be immediately sent to the next step such as a die cutter or a folder gluer after printing. (B) Since the ink spreads entirely between the ink roll and the squeeze roll, color unevenness in the width direction does not occur during printing. Therefore, the operator does not need to constantly monitor the print status. (C) The ink transfer mechanism is extremely simple. <Disadvantages> (a) Since a system that constantly circulates the ink is adopted, it is necessary to wash the roll and the circulation system with a large amount of water when changing colors. Therefore, complete recovery of the ink is not possible and a considerable loss occurs, and a cleaning waste liquid treatment facility is required from the standpoint of pollution prevention measures, resulting in a high cost. (B) Since it takes time to change colors, it is not suitable for printing small lots of various kinds in small lots. (C) It is less glossy than that of Prislo printing.

[0007]

As described above, the Prislo printing machine and the flexographic printing machine have their respective advantages and disadvantages, which are almost contradictory to each other, depending on the properties of the ink used. In the industry, attention has been paid to the advantages of the flexographic printing machine described above, and the conversion from the prism printing machine to the flexographic printing machine has been widely performed. That is, although the flexographic printing machine has its own drawbacks, even if it is taken into consideration, it can be said that the result has been recognized in the industry as having the merit of being introduced over the Prislo printing machine.

By the way, the recent industry is under pressure to cope with small lots for processing a wide variety of small amounts of corrugated cardboard sheets, and the tendency becomes remarkable year by year. Considering this with respect to a printing machine, it means that it is necessary to change colors within a limited time in order to cope with printing of various types and small amounts of corrugated board sheets. However, with respect to the frequent request for order change associated with the printing of the small lot, as described above in the disadvantage of the flexographic printing machine, it is not sufficient to take time to change colors. There is also an inherent problem of treating the cleaning waste liquid.

For such a small lot printing, since the color change time is short, the above-mentioned Prislo printing machine can be preferably used. However, the Prislo printing machine requires the experience and intuition for the operator to maintain the printing condition optimally, and it takes time to dry after printing, and it does not directly connect to the subsequent process. There is. Therefore, users are not always satisfied with the above-mentioned Prislo printing machines for the small lot printing of various types and small quantities, which is increasing recently, and the color change time is shorter than that of flexographic printing. For this reason, the Prislo printing machine is merely used.

In other words, the color change time is shortened and it is possible to sufficiently cope with small lot printing, and it is not necessary for the operator to constantly monitor during printing, and after printing, it is possible to directly connect to the subsequent process. Although there is a strong potential demand from users for equipped printing machines, the reality is that it has not yet been realized. In order to put into practical use a printing machine that has the advantages of so-called so-called Prislo and flexographic printing, the development of an ink that meets the above specifications is a key point. It is similar that both types of printing machines depended on the nature of the ink used, respectively). In this regard, the applicant has made a tie-up with an ink maker to meet the above-mentioned potential demand on the user side, and as a result of fundamentally working on the improvement of the ink itself, a glycol having a low viscosity and a quick drying property similar to flexo ink. Succeeded in developing a system ink.

However, as a result of various tests of the newly developed ink, it was found that the conventional Prislo printing machine cannot bring out the characteristics of the ink to the maximum. Further, although it is possible to use the ink in a flexographic printing machine, it is not necessary to circulate the ink because the ink is not as low in viscosity and quick-drying as the original flexographic ink. Therefore, there is no point in providing an ink circulation mechanism peculiar to a flexographic printing machine, and when changing colors, cleaning time is required and small lots cannot be dealt with, resulting in waste of ink. This is, of course, because each type of printing machine employs a structure that exhibits the properties of a high-viscosity glycol-based ink and a low-viscosity water-based ink, as described above.

Therefore, the applicant who provides the user with a printing machine for corrugated cardboard sheets has found the invention "printing on corrugated cardboard sheets" for a printing machine according to a new concept that can maximize the characteristics of the ink according to this newly developed. Printing method and device ”. In the printing device according to the previous application, by adopting a mechanism that transfers ink to the printing plate and a new mechanism that cleans ink when changing colors, the ink consumption during printing operation can be reduced and the printing order can be reduced. It is possible to quickly change the ink due to the change of No. 1 and the like, and moreover, it is possible to directly connect to the subsequent process, and to make clear and beautiful printing on the corrugated cardboard sheet. However, the previous application proposes a basic configuration including a plurality of embodiments that can bring out the characteristics of the newly developed ink to the maximum extent, and the points of the effect exhibited in each embodiment are different. . Moreover, when putting the printing device into practical use, while satisfying the effect most desired by the user,
It was necessary to clear various conditions (for example, installation space, cost, etc.) that occur when introducing the device, and it was not known at the time of application which of the proposed embodiments was the most suitable.

[0013]

It is an object of the present invention to put an ink transfer mechanism into practical use when putting into practical use a printing machine capable of maximizing the properties of the newly developed ink, especially focusing on the work involved in changing the printing order. It is an object of the present invention to provide a printing machine capable of preventing waste of the ink relating to the old order remaining in the above and wasteful of the ink, and capable of changing ink quickly.

[0014]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems and achieve an intended object, the present invention provides a plate cylinder having a printing plate, an impression cylinder arranged to face the plate cylinder, and the plate cylinder. Close to
It is arranged so that it can come into contact with and separate from it, and when it comes close to it, it is attached to the plate cylinder.
The ink transfer roll that rotates in contact with the printing plate
When the transfer roll is in operation, it constantly comes into contact with the roll and is rotated and supplied.
A squeeze roll for squeezing and adjusting the amount of ink
Ink is transferred to the printing plate through an ink transfer roll, and a corrugated cardboard sheet is passed between the plate cylinder and the impression cylinder that rotate in mutually opposite directions to perform required printing on the sheet. In the printing machine for corrugated cardboard sheets described above, the ink transfer roll and the squeezing roll are arranged at both ends in the axial direction, and both ends in the longitudinal direction of the ink storage portion defined between the rolls are closed. Weir member and front
Serial disposed above the inking roller and squeezing roll is movable parallel to the roll, supply and for supplying and recovering the residual ink of the low viscosity and highly quick-drying ink to the ink reservoir selectively and a recovery device, the test
The supply / recovery device is movable along the ink storage section.
The holding means arranged and the reversible model arranged on the holding means.
Tubing pump that is biased forward and backward by the
Detachable and replaceable on the tubing pump
The ink in the ink pot whose opening is arranged in the holding means is
While immersing it in the ink, and the other opening to the ink reservoir.
A tube facing the at least the pump
A tube with flexibility in the part inserted in (95)
The ink in the ink pot by the urging of the reversible motor.
Ink is supplied to the ink reservoir, and the motor is reversely energized.
To transfer the residual ink in the ink storage area to the ink pot.
It is characterized in that it is configured to fit .

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a corrugated board sheet printing machine according to the present invention will be described below with reference to the accompanying drawings with reference to preferred embodiments. FIG. 1 is a schematic side view of a printing machine according to an embodiment, showing a printing state on a corrugated board sheet, and FIG. 4 is a schematic side view showing an ink washing state after the printing of the printing machine is completed. . The illustrated printing machine 40 includes a printing plate 4 between machine frames 51, 51 (only a part of which is shown) that are separated by a predetermined distance in a direction intersecting the feeding direction of the corrugated board sheet 43.
A plate cylinder 44 to which 2 is detachably mounted, and an impression cylinder 46 that is opposed to the lower side of the corrugated paperboard sheet 43 across the pass line are rotatably provided.
6 are rotated in mutually opposite directions.

An ink transfer mechanism 48 for transferring ink to the printing plate 42 is arranged above the plate cylinder 44.
The ink transfer mechanism 48 applies the supplied ink to the printing plate 4
2, an ink transfer roll 50 that transfers the ink directly to the sheet 2, a squeeze roll 52 that is pressed against the roll 50 to adjust the amount of ink, and the ink transfer roll 50 is displaced about a rotation axis of the squeeze roll 52 within a required angular range. It is basically composed of a swinging mechanism 53 that can be driven. Then, by selectively operating the swinging mechanism 53, an ink transfer position at which the ink transfer roll 50 is brought into contact with the printing plate 42 to transfer the ink to the printing plate 42, as described later,
It can be displaced from the printing plate 42 to an ink cleaning position where the ink cannot be transferred.

That is, the ink transfer roll 50 is disposed so as to be able to come close to and away from the plate cylinder 44, and when it comes close to the plate cylinder 44, the ink transfer roll 50 comes into contact with the printing plate 42 mounted on the plate cylinder 44 and can rotate. Anilox is formed on the surface of the ink transfer roll 50 by forming fine depressions in a desired pattern. These fine depressions function to store a certain amount of ink and prevent ink from scattering during roll rotation. ing. An iron-based metal material is used for the ink transfer roll 50, but 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 50, an iron roll not engraved with anilox (one plated only) or a simple rubber roll can be preferably used.

The squeezing roll 52 disposed adjacent to the ink transfer roll 50 is in constant contact with the ink transfer roll 50 during operation, and rotates at the same speed or at a low speed as the ink transfer roll 50. It functions to adjust the squeeze of excess ink on the surface of 50. The squeeze roll 52 is preferably made of a ferrous metal material or a flexible material such as rubber. When a rubber-based material is used, it is recommended that its hardness be appropriately selected within the range of, for example, a Shore hardness of 50 to 75 degrees according to the length of the roll.

In the ink transfer mechanism 48 including the ink transfer roll 50 and the squeeze roll 52, the ink transfer roll 5 is rotated about the rotation axis of the squeeze roll 52.
A swinging mechanism 53 that can displace 0 within a required angle range is provided. That is, at both shaft end portions of the squeezing roll 52 rotatably arranged in the machine frames 51, 51 facing the inside of the machine frame 51,
The support brackets 62, 62 (only one of which is shown) are rotatably supported, and the ink transfer roll 50 is rotatably supported between the support brackets 62, 62. A holding member 64 is provided on the upper end of the support bracket 62 on the side where the ink transfer roll 50 is pivotally supported, and is eccentrically provided on a switching shaft 66 that is rotatably supported by the machine frames 51, 51. The corresponding eccentric ring 68 is rotatably supported on each holding member 64. The switching shaft 66 is driven to rotate by a motor or an air cylinder (not shown). Therefore, by energizing the motor or the air cylinder to rotate the eccentric wheels 68, 68 at a predetermined central angle, the ink transfer roll 50 is brought into contact with the printing plate 42 as shown in FIG. It is possible to select an ink transfer position to be performed and an ink cleaning position which is separated from the printing plate 42 and disables ink transfer, as shown in FIG. The swinging mechanism 53 is provided with an appropriate detecting means (not shown).
No.) between the plate cylinder 44 and the impression cylinder 46.
The sheet 43 is detected by detecting whether or not the sheet 43 is fed.
When 43 is not fed, the ink transfer roll 50
Is set to be automatically separated from the printing plate 42.
It A mechanism for imparting different rotations to both rolls 50 and 52 is known per se, and therefore its explanation is omitted.

In the ink transfer roll 50 and the squeezing roll 52, when the two rolls 50, 52 are brought into pressure contact with each other, the ink storage portion A can be defined in the longitudinal contact area between the two rolls. There is. A supply / collection device 54 that supplies ink to the ink storage section A and recovers the ink remaining in the storage section A is disposed above the rolls 50 and 52.

The supply and recovery unit 54 this is, 如shown in FIG. 2
In addition, the ink can be quickly supplied over the entire width of both rolls 50 and 52 . That is, the machine frame 5
Horizontal girder 8 parallel to both rolls 50, 52 between the upper ends of 1, 51
5 is erected, and a movable base 88 is movably supported by guide rails 86 formed on the upper surface of the cross beam 85 via rollers 87, 87. A pair of sprockets 89, 89 are rotatably supported by the transverse beam 85 at predetermined intervals in the longitudinal direction, and one of the sprockets 89 is rotated forward and backward by a drive motor 90. Further, an endless chain 91 is wound between both sprockets 89, and a required portion of the endless chain 91 is fixed to the moving base 88. Therefore, by driving the drive motor 90 forward and backward to move the endless chain 91, the movable base 88 moves the guide rail 8 as the chain 91 travels.
Move back and forth along 6.

As shown in FIG. 2, a substantially U-shaped bracket 92 that hangs above the squeeze roll 52 is disposed on the moving base 88, and a predetermined amount of ink is stored in the bracket 92. The pot 58 is detachably attached. A support plate 94 is disposed on the bracket 92 above the ink pot 58, and the tubing pump 95 and the pump 9 are mounted on the support plate 94.
A reversible motor 96 for driving 5 is arranged. A flexible tube 60 is detachably inserted into the tubing pump 95, and one opening 60 of the tube 60 is inserted.
A is immersed in the ink stored in the ink pot 58. Further, the other opening 60b of the flexible tube 60
Faces above the ink reservoir A. In addition,
Connect the tank pot 58 and the tubing pump 95 to the upper and lower
The pot 58 and the pump 95 may be replaced by a structure in which the pot 58 and the pump 95 are arranged.
And may be arranged in parallel at the same level.

The basic structure of the tubing pump 95 is known, and by squeezing the flexible tube 60 by means of rollers 97 that move along a predetermined path,
The ink in the tube is extruded in a predetermined direction.
Then, when the reversible motor 96 is urged in the forward direction to move the roller 60 of the tubing pump 95 in the clockwise direction, the ink in the flexible tube 60 is pushed out toward the opening 60b side, whereby the ink pot 58 is formed. The above ink is supplied to the ink storage portion A. When the reversible motor 96 is biased in the reverse direction to move the roller 97 in the counterclockwise direction,
The ink in the flexible tube 60 is extruded toward the opening 60a side, whereby the ink in the ink storage portion A is set to be collected in the ink pot 58.

Therefore, the reversible motor 96 is rotated in the forward direction.
Opening portion 60b of the flexible tube 60 while urging
To Rukoto to move the in the axial direction of the rolls 50 and 52
Therefore , the ink can be quickly supplied over the entire width of both rolls 50 and 52 . The ink used in the printing machine 40 is a low-viscosity and highly quick-drying glycol-based ink newly developed by the applicant as described above, and it is not necessary to circulate the ink like a flexographic printing machine. Absent.

As shown in FIG. 1, a holder 98, into which the flexible tube 60 extending to the right of the tubing pump 95 is inserted, is vertically mounted on the bracket 92 so that the holder 98 can pass through the holder 98. The lower end opening 60b that is inserted and hangs down faces the ink storage portion A. Further, an air cylinder 99 is placed upside down on the bracket 92, and a holder 98 is connected to a piston rod 99a of the air cylinder 99. The cylinder 99 is biased forward and backward so that the height position of the opening 60b can be displaced. . That is, when changing the ink due to a change in the printing order, the opening 60b of the flexible tube 60 can be dipped in the ink of the old order remaining in the ink storage portion A. When the reversible motor 96 is urged in the reverse direction in this state, the ink remaining in the ink storage portion A is removed from the ink pot 5.
8 can be collected (see FIG. 3). Note that reference numeral 10
0 is a flexible tube 60 depending from the holder 98.
2 shows a guide that supports and holds the opening portion 60b above the ink storage portion A in a stable manner. Further, as a means for changing the height position of the opening 60b, the tubing pump 9 is lifted by raising and lowering the support plate 94 via an air cylinder.
The 5 itself may be moved up and down. Also the support plate
An air cylinder is hung vertically on the lower surface of 94 to support the cylinder.
The holder installed on the piston rod facing the top of the plate requires
A rigid pipe bent into a shape is detachably installed
I do. And at one end of the pipe, the tubing
Opening 6 of flexible tube 60 extending from pump 95
0b is connected and the other end (open end) is connected.
It faces above the ink storage portion A. And like this
When using a rigid pipe, in the ink reservoir A
When collecting the remaining old order ink,
Dip the open end of the ink into the ink remaining in the ink reservoir A.
Energize the air cylinder to lower the pipe
When opening, ensure that the opening end is near the bottom of the ink reservoir A.
It becomes possible to face.

A guide roller 9 is provided on the bottom surface of the bracket 92.
3, 93 are rotatably supported by the guide rollers 93,
As shown in FIG. 1, 93 is configured to slidably contact a guide 56 provided in parallel with both rolls 50 and 52 so that the bracket 92 can move smoothly.

A cleaning liquid supply pipe (not shown) is arranged on the bracket 92, and an opening of the cleaning liquid supply pipe faces the ink storage portion A. A cleaning liquid tank arranged at an appropriate fixed position is connected to the cleaning liquid supply pipe via a pipe (none of which is shown), and the cleaning liquid stored in the tank is pumped to the supply pipe by compressed air. It is supposed to be done. That is, the supply / collection device 54 is arranged horizontally along the guide rail 86 during the printing operation.
It runs in the opposite direction , and supplies ink to the above-mentioned ink storage portion A via the flexible tube 60. In addition, the corrugated board sheet 43
When changing colors due to changes in the print order in
The old order ink remaining in the ink storage section A is collected, and the storage section A is supplied via a cleaning liquid supply pipe (not shown).
Is configured to supply the cleaning liquid to. Note that the cleaning liquid
As a supply means of the
Parallel pipes with multiple through holes at specified intervals in the hand direction
And arranged to supply a cleaning liquid to the pipe by a suitable air pressure
By doing so, all of the rolls 50, 52 can be passed through each through hole.
The cleaning liquid may be simultaneously supplied over the width.

Here, the tubing pump 95 is used.
When recovering the ink remaining in the ink reservoir A
Of the ink stored in the storage portion A by the printing operation.
The viscosity increases, and the residual ink from the pump 95 is smoothed.
It may not be possible to make a proper recovery. So, for example
The supply / recovery device 54 is a device for supplying a diluting liquid such as water.
Or above the ink transfer roll 50 and the squeeze roll 52.
, And the ink is supplied through the supply means before the ink recovery operation.
Apply an appropriate amount of diluting solution to the ink storage area A to make the ink viscosity
Is recommended to be reduced.

As shown in FIG. 1, an air cylinder 72 is placed upside down on the support bracket 62 via a support member 70, and a plate-like dam member 74 is arranged on a piston rod 72a of the air cylinder 72. There is. This dam member 74
2 is always lowered by the urging force of the air cylinder 72, as shown in FIG. Then, the dam member 74 is brought into close contact with the axial end portions of the ink transfer roll 50 and the squeezing roll 52 to close the ink storage portion A defined between the two rolls 50, 52, and to supply the supply The ink and the cleaning liquid supplied from the recovery device 54 can be stored in the storage portion A (see FIG. 1). The inking roller 5
0 and the gutter member 76 downward from the axial ends of the squeeze rolls 52 are disposed, from said ink reservoir A dam member 74
Ink and cleaning liquid that flow out slightly through this gutter
Received by the material 76 and collected in the ink pan 78 described later.
Growling. Ink storage during printing operation
A lot of ink is consumed in the axial center of part A,
If a large amount of ink remains near both ends,
Before shifting to the rolling, the weir member 74 is attached to the air cylinder 72.
The ink reservoir A is opened by raising it by the reverse bias of
Then, the ink remaining in the reservoir A is removed at both ends in the longitudinal direction.
It can also be discharged from the section.

A scraper 80 made of a long blade-shaped plate for cleaning ink when changing colors by changing the order is arranged at a position substantially tangential to the squeeze roll 52. The scraper 80 has its tip oriented along the tangential direction in a direction opposite to the rotation direction of the squeeze roll 52, and is rotated in the normal and reverse directions by an appropriate motor 82 so that it can be brought into contact with and separated from the roll surface. . And when the cleaning of the ink, the scraper 80 biases the motor 82, by contacting the squeeze roll 52, also the ink has spread to the roll 52
The cleaning liquid is scraped off and removed. This removed ink
Alternatively, the cleaning liquid is discharged to the ink pan 78 provided below the scraper 80. A waste liquid pipe 84 communicating with a waste liquid tank (not shown) is connected to the ink pan 78,
Waste liquid discharged to the ink pan 78 that has come to be collected in a waste liquid tank provided in the required site. In addition,
When cleaning, before installing in association with the ink transfer mechanism 48
With the swing mechanism 53, the rotation axis of the squeeze roll 52 is centered.
As shown in FIG. 4, the ink transfer roll 50
Ink washing that is displaced in the clockwise direction and is separated from the printing plate 42
It faces the clean position.

For the scraper 80, a ferrous metal material or a flexible material such as rubber is appropriately selected. When the squeezing roll 52 is made of a flexible material such as rubber, it is recommended that the scraper 80 be made of a material having a hardness equal to or lower than the hardness of the roll 52 (for example, a rubber plate having a low hardness). Thereby, the scraper 80 is squeezed by the squeeze roll 5
It is possible to prevent the squeeze roll 52 from being damaged when the ink or the cleaning liquid is scraped by coming into contact with the second roll 2. In this case, the entire scraper 80 does not necessarily have to be made of a soft material, and a soft material may be separately provided on the tip of the scraper 80 made of a metal material. Further, the scraper 80 in the illustrated example has its tip end oriented in a direction opposite to the rotation direction of the squeeze roll 52, but the invention is not limited to this. On the contrary, with the scraper 80 oriented in the forward direction with respect to the rotation direction of the squeeze roll 52, the roll 5
It may be configured such that it can be brought into and out of contact with the surface of 2. Further, a linear actuator such as an air cylinder can be used as a means for bringing the scraper 80 into contact with and away from the squeeze roll 52.

[0032]

Next, the operation of the corrugated board sheet printing machine having the above-described structure will be described. As a preparatory work for printing, the scraper 80 is separated from the squeeze roll 52.
Let Further, the dam members 74, 74 provided at both axial end portions of both rolls 50, 52 are always in the lowered position to close both longitudinal end portions of the ink storage portion A. Further, the flexible tube 60 inserted into the tubing pump 95 of the supply / collection device 54 has one opening 60a immersed in the ink stored in the ink pot 58, and the other opening 60b formed in the ink storage section. It faces above A.

When the reversible motor 96 is biased in the normal direction in this state, the roller 97 of the tubing pump 95 moves clockwise, squeezing the flexible tube 60 to move the ink inside to the opening 60b side. Extrude. That is, the continuous ironing of the tube 60 by the roller 97 causes the ink in the ink pot 58 to pass through the flexible tube 60 between the rotating ink transfer roll 50 and the squeezing roll 52 (ink storage portion A). Is supplied to. This ink is
It is stored in a state of being regulated by the dam members 74, 74 facing the shaft ends of both rolls 50, 52.

[0034] Under this state, from the stocker upstream, not shown, and supplies the cardboard sheets 43 between the one by one plate cylinder 44 and impression cylinder 46, the swing mechanism 53 is suitably
Ink transfer machine that operates by detecting the sheet by the detection means
The ink transfer roll 50 of the structure 48 is the plate cylinder 44 (printing plate 42).
Contact with the surface of the printing plate 42 to transfer an appropriate amount of ink.
Is, printing of Tokoro is needed the sheet 43 is applied. Since the ink is quick-drying, it can be immediately sent to a die cutter, a folder gluer or the like in a subsequent process after printing. Further, since the ink is spread over the entire space between the ink transfer roll 50 and the squeeze roll 52, color unevenness in the width direction does not occur during printing, and therefore the operator does not need to constantly monitor the printing state.

Here, the consumption amount of the ink stored in the ink storage portion A does not decrease uniformly in the axial direction, but varies depending on the printing position and the printing area of the corrugated board sheet 43. Therefore, in this case, the drive motor 90 is urged to move the moving base 88 along the guide rail 86, and the opening 60b of the flexible tube 60 is set to a place where the ink consumption amount in the ink storage portion A is large. To face. Then, the ink in the ink pot 58 is replaced with the tube 60.
By supplying the ink to the storage portion A via the ink, it is possible to supply the necessary amount of ink to a portion corresponding to the ink consumption amount . Because it is not circulating in the or ink, it is possible to omit the ink was required for conventional circulation, it is possible to reduce the lot unit at the time of ink purchase, can and reduce the inventory costs.

When the ink to be used is changed in order to change the color due to the change of the printing order, the ink is collected and washed in the following procedure. First, the reversible motor 9
6 is stopped and the ink supply by the flexible tube 60 is stopped. Further, the air cylinder 99 is urged in the direction in which the rod 99a is extended to lower the flexible tube 60 together with the holder 98, and as shown in FIG.
Is immersed in the ink of the old order remaining in the ink storage portion A. Next, the bracket 92 is attached to both rolls 50, 5
By moving the reversible motor 96 in the reverse direction while moving it in the axial direction of 2 and moving the roller 97 of the tubing pump 95 in the counterclockwise direction, the ink remaining in the ink storage portion A is transferred to the flexible tube 60. It is sucked up via the ink and collected in the ink pot 58. This allows
The ink remaining in the storage portion A without being used can be recovered, and the ink can be prevented from being wastefully discarded. The ink is stored in the ink storage unit A by the printing operation.
If the viscosity of the ink being used is high,
Prior to the ink recovery operation, an appropriate amount of diluted ink was stored in the ink storage area A.
Spray the liquid to reduce the viscosity of the ink.

Next, Ru increases the opening 60b reversely biased air cylinder 99. In addition, after the printing operation is completed
A corrugated cardboard sheet 43 is provided between the plate cylinder 44 and the impression cylinder 46.
When the paper is no longer fed, the ink transfer mechanism 48
The transfer roller 50 is mounted on the plate cylinder 44 by the swing mechanism 53.
Moved to the ink cleaning position away from (printing plate 42)
I have. Therefore, the motor 82 is energized to move the scraper 8
0 is brought into contact with the squeeze roll 52 at an appropriate pressure. When the ink transfer roll 50 and the squeeze roll 52 are idly rotated at the same peripheral speed, the ink adhering to the surface of the squeeze roll 52 is scraped up and removed by the scraper 80,
The ink is discharged to the ink pan 78. Further, as described above, the center of the ink reservoir A in the axial direction during printing operation
A lot of ink is consumed in some parts, and many ink is consumed near both ends in the axial direction.
If a certain amount of ink remains, the dam member 74 is
The ink is stored in the ink reservoir A by raising it by the reverse urging of the binder 72.
The ink remaining on the shaft end side of the reservoir A is released.
It may be discharged to the gutter member 76. in this case
Can shorten the ink scraping time.

Most of the ink remaining in the ink storage portion A without being recovered by the supply / recovery device 54 is removed by the scraper 80, but a small amount of ink is left in the anilox of the ink transfer roll 50. It remains. Therefore, the scraper 80 is separated from the squeezing roll 52, and the cleaning liquid is supplied to the ink storage portion A defined between the rolls 50 and 52 via the cleaning liquid supply pipe arranged in the supply / collection device 54. . Since both ends of the storage portion A in the longitudinal direction are closed by the dam members 74, 74, the cleaning liquid is stored in a state of being spread over the entire axial direction. Scraper 8 again in this state
0 is brought into contact with the squeeze roll 52 at an appropriate pressure, and
The transfer roll 50 and the squeeze roll 52 are emptied at the same peripheral speed.
When rotated, the cleaning liquid stored in the ink reservoir A
The cleaning liquid is scraped off by the scraper 80, and the cleaning liquid is removed.
It is discharged to the ink pan 78. In addition, when supplying the cleaning liquid to the ink storage portion A while moving the bracket 92 in the axial direction of both rolls 50 and 52, the cleaning time can be shortened. Also, the weir members 74, 7
4 is raised to open the ink storage portion A,
The stored cleaning liquid may be discharged from the shaft end.
Yes.

Further, the ink pot 58 mounted on the bracket 92 of the supply / recovery device 54 is replaced with one storing ink for a new order, and the flexible tube 60 is removed from the tubing pump 95. After the flexible tube 60 is washed outside the apparatus, it is inserted into the tubing pump 95 again and the opening 6 of
The color change is completed by immersing 0a in the ink stored in the ink pot 58 and exposing the other opening 60b above the ink storage A.

The ink pot 58 and the ink reservoir A
Since close to the length dimension of the flexible tube 60 is short, it is possible to reduce the ink you attached residual into the tube 60, the cleaning of the tubing pump 95 itself is not required, Ink loss can be reduced. Further, if the washed flexible tube 60 is prepared in advance when changing the order, it is possible to change the color in an extremely short time for replacing the tube 60.

In this way, when the color is changed due to the order change, the ink remaining in the ink storage portion A can be collected, so that the wasteful ink can be suppressed to a very small amount, and the ink can be saved. Also scraper 80
Thus, the ink adhering to the ink transfer roll 50 can be reliably removed by using an extremely small amount of cleaning liquid after scraping most of the ink. Further, if the flexible tube is replaced, it is not necessary to clean the pump and the ink circulation system, so order change can be performed in a short time and it is possible to suitably cope with small lot printing of various small quantities. . The amount of cleaning liquid used for ink cleaning was about 60 liters in the conventional flexographic printing machine, whereas it was 100 when the newly developed ink was used.
It can be reduced to about cc, the amount of cleaning waste liquid can be suppressed to an extremely small amount, and it can greatly contribute to pollution prevention.

[0042]

[Regarding another embodiment] FIG. 5 is a schematic side view of a printing machine according to another embodiment. The basic configuration of the plate cylinder 44, the impression cylinder 46, and the ink supply / collection device 54 is as shown in FIG. This is the same as that described with reference to FIG. However, the mechanism for adjusting the ink amount of the ink transfer roll 50 in the mechanism 48 for transferring the ink to the printing plate 42 is different. That is, the adjustment plate 110 made of a long plate is tangentially connected to the pair of support brackets 62, 62 on which the ink transfer roll 50 is rotatably supported, in the forward direction with respect to the rotation direction of the transfer roll 50. It is oriented along the direction. This adjusting plate 110 is connected to a motor 112, and the motor 1
By the forward and reverse biasing of 12, the distance between the tip of the roll and the roll surface is adjustable, and it functions to adjust the amount of ink on the surface of the ink transfer roll 50. The distance between the adjusting plate 110 and the ink transfer roll 50 may be adjusted by a linear actuator such as an air cylinder instead of the motor 112.

Above the ink transfer roll 50 and the adjusting plate 110, the ink storage portion A is formed in the longitudinal direction of both members.
And the longitudinal ends of the storage portion A are always closed by the dam members 74, 74 described above. Incidentally, in the closed configuration of the longitudinal ends of the ink reservoir A, it may be performed by the air curtain. For example, a pair of air blowing pipes connected to a blower source are exposed above the vicinity of both ends of the ink storage portion A, and air is blown from the air blowing pipe toward the storage portion A during printing operation of the printing machine. dam the ink by Ru.

A scraper 80 made of a long plate is disposed at a position close to the ink transfer roll 50. The scraper 80 is connected to a fluid pressure cylinder 114 and can be brought into and out of contact with the roll surface. . Then, as shown in FIG. 6, when the scraper 80 comes into contact with the ink transfer roll 50, the ink transferred to the roll 50 or
The cleaning liquid is removed. Ink removed or washed
The liquid is placed in an ink pan 78 below the scraper 80.
It is supposed to be discharged . Further, the drive source of the scraper 80 may be a motor as in the embodiment shown in FIG.

The ink transfer roll 50 is displaced between an ink transfer position where ink is transferred by contacting the printing plate 42 and an ink cleaning position where the transfer of ink is disabled by separating from the printing plate 42. The swing mechanism 53 is basically the same as the embodiment shown in FIG. However, each of the support brackets 62 is rotatably supported by the machine frame via a protruding shaft 116 that is provided on the outside (a side that is separated from the other opposing support bracket 62). Then, by rotating the switching shaft 66, the support brackets 62,
62 is configured to rotate about the protruding shafts 116, 116 to displace the ink transfer roll 50 between the ink transfer position (FIG. 5) and the ink cleaning position (FIG. 6).

[0046]

[Operation of Another Embodiment] Next, the stepped bobbin according to another embodiment described above.
The operation of the printing machine for a sheet will be described. Preparation for printing
As a work, as shown in FIG.,Scraper 80
It is separated from the ink transfer roll 50. Also, Adjustment plate 1
The gap between the tip of 10 and the surface of the ink transfer roll 50,
The motor 112 is energized to adjust to an appropriate value. Change
To The weir members 74,74AlwaysIn the lowered position, in front
By closing both longitudinal ends of the ink storage portion A,
There is. And the adjusting plate 110 and the rotating ink transfer roll
Extends from the tubing pump 95 during 50
When ink is supplied through the flexible tube 60, the ink
The ink is stored in the state that the ink is regulated by the dam members 74, 74.
Stored in Part A.

[0047] Under this state, from the stocker upstream, not shown, and supplied to between the corrugated cardboard sheet 43 one by one plate cylinder 44 and impression cylinder 46, the swing mechanism 53 is suitably
Ink transfer machine that operates by detecting the sheet by the detection means
The ink transfer roll 50 of the structure 48 is the plate cylinder 44 (printing plate 42).
Contact with the surface of the printing plate 42 to transfer an appropriate amount of ink.
Is, printing of Tokoro is needed the sheet 43 is applied. Since the ink is quick-drying, it can be immediately sent to a die cutter, a folder gluer or the like in a subsequent process after printing. Further, since the ink is spread over the entire space between the ink transfer roll 50 and the adjusting plate 110, color unevenness in the width direction does not occur during printing, and therefore the operator does not need to constantly monitor the printing state.

When the ink to be used is changed in order to change the color due to the change of the print order, the ink is washed by the following procedure. First, the ink supply by the flexible tube 60 extending from the tubing pump 95 is stopped. Further, the tubing pump 95 is reversely operated in a state where the flexible tube 60 is lowered and the opening portion 60b is immersed in the ink remaining in the ink storage portion A, thereby collecting the residual ink in the ink pot 58. .

Next, the flexible tube 60 is raised . What
After the printing operation is completed, the plate cylinder 44 and the impression cylinder 46 are
When the corrugated cardboard sheet 43 is no longer passed between
The ink transfer roll 50 of the ink transfer mechanism 48 is
Separated from the plate cylinder 44 (print plate 42) by the swing mechanism 53.
Has been moved to the ink cleaning position (see FIG. 6). Therefore, the fluid pressure cylinder 114 is urged to move the scraper 8
0 is brought into contact with the ink transfer roll 50 at an appropriate pressure. When the distance between the ink transfer roll 50 and the adjusting plate 110 is increased, most of the ink remaining in the ink storage portion A without being collected by the flexible tube 60 is transferred roll 50.
The ink adheres to the surface of the ink, is scraped up by the scraper 80, and is discharged to the ink pan 78.

Next, the scraper 80 is separated from the ink transfer roll 50, and the adjusting plate 110 is attached to the roll 5.
0, and the cleaning liquid is supplied to the ink storage portion A via the cleaning liquid supply pipe arranged in the supply / collection device 54. Since both ends of the storage portion A in the longitudinal direction are closed by the dam members 74, 74, the cleaning liquid is stored in a state of being spread over the entire axial direction. In this state, the scraper 80 is again placed on the ink transfer roll 50.
Contact with an appropriate pressure and adjust with the ink transfer roll 50.
When the distance between the knot plate 110 and the transition plate 50 is increased, the surface of the transfer roll 50 is
The cleaning liquid adhering to the
The ink is removed and discharged to the ink pan 78. In addition,
The ink on the ink transfer roll 50 is scratched by the reaper 80.
After removing the scraper 80 to the ink transfer roll 50
Supply the cleaning liquid to the ink reservoir A in the contact state
You may make it wash | clean by this.

By replacing the ink pot 58 of the supply / collection device 54 and removing the flexible tube 60 from the tubing pump 95 for cleaning, or by replacing it with a tube 60 prepared in advance, Color change is completed.

[0052] Incidentally, the ink selectively perform supply and recovery unit to supply and recovery is not limited to one group as in Example, it may be disposed a plurality of supply and recovery unit in series . In this case, since each supply / recovery device has only to move in a short area, it is possible to quickly supply the ink to the required portion of the ink storage section. Further, in the embodiment, the case where the ink supply to the ink storage portion and the ink recovery are performed by using the tubing pump has been described, but the present application is not limited to this, and any pump capable of forward and reverse biasing can be used. , Other types can also be adopted.

[0053]

As described above, according to the corrugated board sheet printing machine of the present invention, an ink reservoir is defined between the ink transfer roll and the squeezing roll, and the reservoir is closed by the dam member. Since it can be formed, the required amount of ink can be stored in the storage portion. Therefore, color unevenness does not occur, and the operator does not need to constantly monitor the printing state. Further, by configuring movably supply and recovery system of the ink along the ink reservoir, of the two rolls
Ink can be quickly supplied over the entire width . It is not necessary to circulate constantly duck ink, and there is the advantage that mechanism is simplified.

Further, when the color is changed due to the change of the printing order, the ink remaining in the ink storage portion can be recovered through the supply / recovery device, so that the wasteful ink can be suppressed to a very small amount. Ink saving is achieved. Moreover, as described above, since the ink is not always circulated, the amount of the waste liquid used for cleaning is extremely small, which greatly saves the ink and is extremely advantageous from the viewpoint of preventing pollution. Further, since no ink kneading mechanism or circulation mechanism is required, space saving and low cost can be realized.

Further, since the tubing pump is used to supply and recover the ink, it is not necessary to wash the pump itself when changing colors, and the amount of ink discarded due to washing can be reduced. Can be suppressed. Further, since the flexible tube can be easily removed from the pump, the tube can be easily washed in a short time, and the time required for color change can be extremely shortened. Further, if a flexible tube that has been washed is prepared in advance for color change, this can further shorten the time.

[Brief description of drawings]

FIG. 1 is a schematic side view of a printing machine according to an embodiment of the present invention, showing a printing state on a corrugated board sheet.

2 is a perspective view of essential parts showing a schematic configuration of an ink transfer mechanism and a supply / collection device in the printing machine shown in FIG.

FIG. 3 is a schematic side view showing a state of ink collection after printing is completed in the printing machine shown in FIG.

FIG. 4 is a schematic side view showing a state of ink cleaning after printing is completed in the printing machine shown in FIG.

FIG. 5 is a schematic side view of a printing machine according to another embodiment of the present invention, showing a printing state on a corrugated board sheet.

6 is a schematic side view showing a state of ink cleaning after printing is completed in the printing machine shown in FIG.

FIG. 7 is a side view schematically showing various roll arrangements of a conventional prism printing machine.

FIG. 8 is a side view schematically showing various roll arrangements of a flexographic printing machine according to the related art.

9 is a perspective view showing a schematic mechanism of an ink circulation supply system in the flexographic printing machine shown in FIG.

[Explanation of symbols]

 42 printing plate 43 cardboard sheet 44 plate cylinder 46 impression cylinder 50 ink transfer roll 52 squeezing roll 54 supply / collection device 58 ink pot 60 flexible tube 74 dam member 95 tubing pump 96 reversible motor A ink reservoir

Claims (1)

(57) [Claims] 1. A plate cylinder (44) fitted with a printing plate (42).
And an impression cylinder (46) arranged opposite to the plate cylinder (44),
An ink transfer roll (50), which is disposed so as to be able to come close to and away from the plate cylinder (44) and rotates in contact with the printing plate (42) mounted on the plate cylinder (44) when the plate cylinder (44) is in close proximity. A squeezing roll (52) that constantly contacts and rotates the roll (50) during operation to squeeze and adjust the amount of ink supplied.
And transferring ink to the printing plate (42) through the ink transfer roll (50), and between the plate cylinder (44) and the impression cylinder (46) which rotate in mutually opposite directions. The corrugated cardboard sheet (43) is passed through and the sheet (4
In the corrugated board sheet printing machine configured to perform the required printing in 3), the ink transfer roll (50) and the squeezing roll (52) are arranged at both axial ends of the roll and the space between the rolls (50, 52). A dam member (74, which closes both longitudinal end portions of the ink storage portion (A) defined by
74) and the rolls (50, 5) disposed above the ink transfer roll (50) and the squeezing roll (52).
2) which is movable in parallel with 2) and is provided with a supply / recovery device (54) for selectively supplying low-viscosity and highly quick-drying ink to the ink storage section (A) and collecting residual ink. The recovery device (54) is a holding means (92) movably arranged along the ink reservoir (A).
And a reversible motor (9) disposed on the holding means (92).
6) Tubing pump (95) that is biased forward and backward by
And is inserted into and removed from the tubing pump (95) so that the opening (60a) on one side can be held by the holding means (9).
2) A tube which is dipped in the ink in the ink pot (58) arranged in 2) and has the other opening (60b) facing the ink storage section (A), at least in the pump (95) thereof. The reversible motor (96), which comprises a tube (60) having flexibility in a portion to be inserted.
The ink in the ink pot (58) is supplied to the ink reservoir (A) by the bias of the motor, and the residual ink in the ink reservoir (A) is removed by the reverse bias of the motor (96). A printing machine for corrugated cardboard sheets, which is configured to be collected into.