JP2777760B2 - Corrugated sheet printing machine - 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 the use of a glycol-based ink having a low viscosity and a high quick-drying property according to a new development of the present applicant. The present invention relates to a printing press capable of rapidly changing inks in accordance with a change in a printing order of a sheet and the like, and capable of minimizing a waste liquid amount.

[0002]

2. Description of the Related Art Conventional cardboard sheet printing machines can be generally classified into two types. That is, a vertical rotary printing press shown in FIG. 6 and a flexographic printing press shown in FIG. 7 have different configurations according to the properties of the ink used, and have advantages and disadvantages as described later. Conflicting.

[0003] First, a vertical rotary press will be described.
It has this name because the corrugated cardboard sheet is passed in a vertically long direction at right angles to the corrugated sheet. However, at present, it is widely used in printers / slotters that print corrugated cardboard sheets horizontally and also performs processes such as slotting.In the industry, it is called a pre-slot printing machine. Shall be. This pre-slot printing machine uses a glycol-based ink having a high viscosity, kneads the ink with many rubber rolls, makes the ink uniform, and transfers the ink to a printing plate mounted on a plate cylinder.
For example, FIG. 6 shows various roll groups of a pre-slot printing machine,
A corrugated cardboard sheet 16 is passed between a plate cylinder 12 on which the printing plate 10 is mounted and an impression cylinder 14 arranged opposite to the plate cylinder 12 to perform appropriate printing. Further, the ink in the ink reservoir 20 is transferred to the printing plate 10 via a pick-up roll 22, an intermediate roll 24, and a series of transfer rolls 18.

[0004] The above-described pre-slot printing press has its own advantages and disadvantages, which are listed below.
These advantages and disadvantages can basically be attributed to the use of glycol-based inks having high viscosity. <Advantages> (a) The print is glossy because it is printed in a raised shape on the sheet surface. (b) Since ink needs to be supplied only to necessary portions of the printing plate, the amount of ink consumption is small (the ink is not circulated). (c) In changing the color, the ink on the roll is removed only by scraping. Therefore, you can change orders in a short time,
It can correspond to various kinds of small lot printing. Unlike flexographic printing, which will be described later, almost no cleaning waste liquid is generated, so that it is not necessary to provide a waste liquid treatment facility which increases costs. <Disadvantages> (a) In recent years, glycol-based inks are mainly quick-drying inks, and recently the degree of improvement has been further improved. However, compared to flexographic printing described below, drying after printing still requires a considerable amount of time. Therefore, it cannot be directly connected to a die cutter, folder glue, or the like in a later process. (b) Since it is necessary to knead the high-viscosity ink uniformly, the number of rolls for ink transfer is increased and the mechanism becomes complicated. When the rolls are worn, a complicated operation for adjusting the interval between the rolls is required. (c) At the time of supplying the ink, the ink is transferred to the sheet with a large amount of ink, so that the printing is dark, and as the ink is consumed, the amount of ink transferred to the sheet is reduced and the printing is performed lightly. For this reason, the operator always needs to monitor the darkness and lightness of the color and perform a complicated operation such as supplying ink when the color becomes light.

Next, a flexographic printing press uses a low-viscosity water-based ink which is rich in fluidity unlike a pre-slot printing press, and has a feature that ink drying is extremely fast. For example, FIG. 7 schematically shows various roll groups of a flexographic printing press. A corrugated cardboard sheet 16 passes between a plate cylinder 12 on which a printing plate 10 is mounted and an impression cylinder 14 arranged opposite to the plate cylinder 12. Then, appropriate printing is performed. Plate cylinder 12
The anilox roll 26 and the ink roll 28 are rotatably disposed in the vicinity of the roller, and the ink supplied between the two rolls 26, 28 is transferred to the printing plate 10 of the plate cylinder 12 via the anilox roll 26. You. Since the flexographic ink is highly quick-drying, unlike the above-described pre-slot printing, it is necessary to constantly circulate the ink to prevent drying and solidification. For this reason, as shown in FIG. 8, the ink in the tank 30 is supplied between the two rolls 26 and 28 via a pump 32 and a supply pipe 34, and the ink retained therein is discharged from the two rolls 26 and 28. From both ends of the dam
In addition, a circulation mechanism for collecting the liquid in the tank 30 through a collecting pipe 38 is employed.

The advantages and disadvantages of the above-described flexographic printing press are listed below. These advantages and disadvantages are also attributable to the properties of the ink used, ie, low viscosity and high speed drying. <Advantages> (a) Since quick-drying ink is used, it can be immediately sent to the next process such as a die cutter or folder glue after printing. (b) Since ink spreads all over the anilox roll and the ink roll, color unevenness in the width direction does not occur during printing. Therefore, the operator does not need to constantly monitor the printing status. (c) The ink transfer mechanism is extremely simple. <Disadvantages> (a) Since a system that constantly circulates ink is adopted, it is necessary to wash the roll and circulation system with a large amount of water when changing colors. Therefore, complete recovery of the ink is impossible and causes a considerable loss. In addition, from the viewpoint of measures for preventing pollution, a facility for treating a cleaning waste liquid is required, which increases the cost. (b) Since it takes time to change colors, it is unsuitable for small lot printing of various kinds and small quantities. (c) There is no gloss as compared to pre-slot printing.

[0007]

As described above, the pre-slot printing press and the flexographic printing press have almost mutually contradictory advantages and disadvantages depending on the properties of the ink used. In the industry, attention has been paid to the advantages of the above-described flexographic printing press, and the conversion from the prislot printing press to the flexographic printing press has been widely performed. That is, although the flexo printing press has its own drawbacks, it can be said that even if this is taken into consideration, it is recognized in the industry that there is a merit of introduction over the prislot printing press.

In recent years, the industry has been required to cope with small lots for processing a large variety and a small amount of corrugated cardboard sheets, and the tendency has been remarkable over the years. Considering this with respect to a printing machine, it means that it is necessary to perform color change within a limited time in order to correspond to printing of various and small amounts of corrugated cardboard sheets. However, in response to the request for frequent order change accompanying the printing of the small lot, as described in the above-mentioned disadvantage of the flexographic printing press, it is insufficient to take time to change colors. In addition, there is also a problem of treating the washing waste liquid.

For such a small lot printing, the color change time is short, so that the above-described pre-slot printing machine can be suitably used. However, preslot printing machines require the operator's experience and intuition in order to maintain the printing state optimally, and also have the drawbacks described above, such as that drying after printing takes time and does not directly lead to subsequent processes. I have. Therefore, users are not always satisfied with the use of the pre-slot printing machine for a large number of small-lot printings that have been increasing recently, and the color changing time is shorter than that of flexographic printing. For this reason, the pre-slot printing machine is merely used.

Conversely, the color change time is shortened, and it is possible to cope with small lot printing. It does not require constant monitoring by the operator during printing, and has a function that can be directly connected to the subsequent process after printing. There is a strong potential demand of users for equipped printing presses, but the reality is that they have not been realized yet. In order to put such a printing machine having the advantages of so-called pre-slot and flexographic printing into practical use, the key point is to develop an ink suitable for satisfying the above-mentioned specifications (this is described above. Just as both types of printing presses each depended on the nature of the ink used). In this regard, the applicant tied up with an ink manufacturer to meet the potential demand on the user side mentioned above, and as a result of fundamentally working on improving the ink itself,
We have succeeded in developing a glycol-based ink that has low viscosity and fast-drying properties similar to flexographic inks.

However, as a result of various tests on the ink according to the newly developed method, it was found that the characteristics of the ink cannot be maximized with a conventional preslot printing press. Although it is not impossible 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 fast drying as the original flexographic ink. Therefore, there is no point in providing an ink circulation mechanism peculiar to the flexographic printing press. In addition, when changing colors, a washing time is required, so that it is not possible to cope with small lots, resulting in waste of ink. This is a matter of course, as described above, since each type of printing press employs a structure that exhibits the characteristics of a high-viscosity glycol-based ink and a low-viscosity aqueous ink.

The applicant, who provides a printing machine for cardboard sheets to the user, has developed a printing machine according to a new concept that can maximize the characteristics of the ink according to the newly developed invention, and describes the invention "Corrugated cardboard sheet. Printing Method and Apparatus ". The printing apparatus according to the earlier application employs a mechanism for transferring ink to a printing plate and a new mechanism for washing ink when changing colors, thereby reducing ink consumption during a printing operation and reducing printing order. Ink can be quickly changed in accordance with the change of the ink and the like, and can be directly connected to the subsequent process, so that clear and beautiful printing can be performed on the corrugated cardboard sheet. However, in the earlier application, the basic configuration including a plurality of embodiments capable of maximizing the characteristics of the ink according to the newly developed technology was proposed, and the points of the effects achieved in each embodiment were different. . Also, when the printing device is put to practical use, while satisfying the effects most desired by the user,
It was necessary to clear various conditions (for example, installation space, cost, etc.) generated when introducing the apparatus, and at the time of filing, it was not known which of the proposed embodiments was optimal.

[0013]

An object of the present invention is to provide a printing press capable of maximizing the characteristics of an ink according to a newly developed ink jet printer. It is an object of the present invention to provide a printing machine which can be performed quickly, can reduce the amount of washing waste liquid extremely, and is excellent in printing workability.

[0014]

[0015]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems and achieve the intended object, the present invention provides a plate cylinder on which a printing plate is mounted, an impression cylinder opposed to the plate cylinder, and the plate cylinder. It is disposed so that it can approach and separate from the printing plate, and when approaching, it rotates while contacting the printing plate mounted on the plate cylinder and transfers ink to the printing plate.
It is possible to separate from the printing plate at the time of separation.
An ink transfer roll that disables ink transfer, a squeezing roll that rotates while always in contact with the ink transfer roll during operation, and adjusts the amount of ink; and an axial end of the ink transfer roll and the squeezing roll. A dam member that is disposed and that can select the closing or opening and closing both ends in the longitudinal direction of the ink reservoir defined between the two rolls, without being supplied to the ink reservoir and circulating.
The stored ink is transferred to the printing plate via the ink transfer roll, and a corrugated cardboard sheet is passed between the plate cylinder and the impression cylinder rotating in opposite directions to each other, so that the sheet needs to be transferred. In a printing machine for corrugated cardboard sheets configured to carry out printing, the ink storage unit is disposed so as to be movable in the axial direction above the ink transfer roll and the squeezing roll, and requires a low-viscosity, highly-drying circulation in the ink storage unit. Shina
Supply means for supplying a new ink and / or a cleaning liquid;
The roller extends in parallel to substantially the entire length in the axial direction in proximity to the squeezing roll, and is disposed so as to be able to freely contact and separate from the surface below the rotation center of the roll, and is directly attached to the squeezing roll. The contacting part is made of a scraper made of a material having a hardness equal to or lower than the hardness of the squeezing roll, and the ink transfer roller is used for color change accompanying a change in printing order;
While supplying a cleaning liquid to the ink reservoir as well as separate the Lumpur from the plate cylinder, the table rolls squeeze the scraper
The waste liquid transferred to the squeezing roll is scraped off by directly contacting the surface and rotating the squeezing roll.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a printing machine for cardboard sheets according to the present invention.

[0017]

FIG. 1 is a schematic side view of a printing press according to a first embodiment, showing a printing state on a corrugated cardboard sheet, and FIG. It is a schematic side view which shows a washing state. Printing machine 4 shown
Reference numeral 0 denotes a plate cylinder 44 on which the printing plate 42 is detachably mounted, and an impression cylinder 46 disposed below and opposed to the corrugated paperboard sheet 43 with the pass line interposed therebetween. The rotation in the opposite direction is made.

Above the plate cylinder 44, an ink transfer mechanism 48 for transferring ink to the printing plate 42 is provided.
The ink transfer mechanism 48 transfers the supplied ink to the printing plate 4.
2, a squeezing roll 52 which is pressed against the roll 50 to squeeze the ink amount, and displaces the ink transfer roll 50 in a required angle range around the rotation axis of the squeezing roll 52. And a swing mechanism 53 that can be driven. By selectively operating the rocking mechanism 53, 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 to an ink washing position where it is separated from the printing plate 42 to make the ink transfer impossible. That is, the ink transfer roll 50 is disposed so as to be close to and away from the plate cylinder 44, and is rotatable in contact with the printing plate 42 mounted on the plate cylinder 44 when approaching. On the surface of the ink transfer roll 50, anilox having fine recesses formed in a required pattern is formed. These fine recesses function to store a certain amount of ink and to prevent ink scattering when the roll rotates. ing. Although an iron-based metal material is used for the ink transfer roll 50, 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 without anilox engraving (plated only) or a simple rubber roll can be suitably used.

The squeezing roll 52 as an adjusting member disposed adjacent to the ink transfer roll 50 is always in contact with the ink transfer roll 50 during operation, and is also in contact with the ink transfer roll 50.
Rotating at the same speed or low speed as 0, ink transfer roll 5
It functions to adjust the squeezing of the surplus ink on the surface of 0. The squeezing roll 52 is made of a soft material such as rubber, and its hardness is appropriately selected, for example, in the range of 50 to 75 degrees of Shore hardness according to the length of the roll.

In the ink transfer mechanism 48 including the ink transfer roll 50 and the squeezing roll 52, the ink transfer roll 5
A swing mechanism 53 capable of displacing 0 in a required angle range is provided. That is, the support bracket 6 is attached to both shaft ends of the squeezing roll 52 rotatably disposed on a machine frame (not shown).
2, 62 (only one is shown) is rotatably pivotally supported, and an ink transfer roll 50 is rotatably supported between the support brackets 62, 62. A holding member 64 is provided at the upper end of the support bracket 62 on the side where the ink transfer roll 50 is pivotally supported, and a corresponding eccentrically disposed switching shaft 66 is rotatably supported on the machine frame. Eccentric wheel 68
Are rotatably supported by the holding members 64. The switching shaft 66 is driven to rotate by a motor (not shown). Therefore, by rotating the eccentric wheels 68, 68 at a predetermined center angle by urging the motor, the ink transfer roll 50
As shown in FIG. 1, an ink transfer position where ink is transferred by bringing the ink into contact with the printing plate 42, and an ink washing position where the ink is transferred away from the printing plate 42 to disable the transfer of ink as shown in FIG. 2. You can choose. The swing mechanism 53
Detects whether or not the corrugated cardboard sheet 43 is passed between the plate cylinder 44 and the impression cylinder 46 by an appropriate detecting means (not shown), and detects whether the sheet 43 is not passed. Is set to automatically separate the ink transfer roll 50 from the printing plate 42. And both rolls 50,5
The mechanism for giving different rotations to 2 is well known per se, and will not be described.

Above the ink transfer roll 50 and the squeezing roll 52, when the two rolls 50, 52 are pressed against each other, an ink reservoir A is formed in a contact area in the longitudinal direction of the two rolls. Has become. A supply device 54 for selectively supplying ink or cleaning liquid to the ink storage section A is provided above the two rolls 50 and 52. The supply device 54 is configured to supply ink quickly over the entire width of both rolls 50 and 52. That is, a head 58 for storing a predetermined amount of ink is mounted on a guide rail 56 provided horizontally with the rolls 50 and 52 so as to run in the axial direction of the rolls 50 and 52, and extends from the head 58. Ink supply pipe 60
Has its opening facing the ink reservoir A.
Therefore, the ink from the supply pipe 60 is supplied between the ink transfer roll 50 and the squeezing roll 52, and is stored in the roll axis direction. However, as described above, the ink used in the printing press 40 is a glycol-based ink newly developed by the applicant which has a low viscosity and a high speed drying, and requires ink circulation as in a flexographic printing press. There is no.

The supply device 54 has a cleaning liquid supply pipe.
(Not shown) is provided, and the opening of the cleaning liquid supply pipe faces the ink storing section A. The cleaning liquid supply pipe is connected via a pipe (neither is shown) to a cleaning liquid tank arranged in the vicinity of a driving means for moving the head 58 along the guide rail 56, and is stored in the tank. The cleaning liquid is sent to the supply pipe by compressed air. That is, the supply device 54 travels in a horizontal direction along the guide rail 56 during the printing operation, and supplies the ink to the above-described ink storage section A via the ink supply pipe 60. Further, when changing the color of the corrugated cardboard sheet due to a change in the printing order, etc., the ink storage section A
The cleaning liquid is supplied through a cleaning liquid supply pipe (not shown). As a cleaning liquid supply means, a pipe having a plurality of through holes formed at predetermined intervals in the longitudinal direction is disposed in parallel above the two rolls 50 and 52, and the cleaning liquid is supplied to the pipe by an appropriate air pressure. By supplying
The cleaning liquid may be supplied simultaneously over the entire width of the rolls 50 and 52 via the through holes.

As shown in FIG. 1, an air cylinder 72 is disposed on the support bracket 62 via a support member 70, and a plate-shaped dam member 74 is disposed on a piston rod 72a of the air cylinder 72. I have. This weir member 74
Is always lowered by the urging of the air cylinder 72 as shown in FIG. Then, the weir member 74 is brought into close contact with the axial ends of the ink transfer roll 50 and the squeezing roll 52 to close the ink reservoir A defined between the two rolls 50 and 52, and the supply device The ink and the cleaning liquid supplied from 54 can be stored in the storage section A (see FIG. 1). A gutter member 76 is provided below both ends of the ink transfer roll 50 and the squeezing roll 52 in the axial direction. The gutter member 76 receives the ink and the cleaning liquid that slightly flow out of the ink reservoir A through the weir member 74. Are collected in an ink pan 78 described later. When a large amount of ink is consumed in the central portion in the axial direction of the ink storage section A during the printing operation and a large amount of ink remains near both ends in the axial direction, before the cleaning operation is started, the dam member is used. 74 can be raised by the reverse bias of the air cylinder 72 to open the ink reservoir A, and the ink remaining in the reservoir A can be discharged from both ends in the longitudinal direction.

At a substantially tangential position close to the squeezing roll 52, a scraper 80 formed of a long blade-like plate for washing the ink when changing colors by changing the order or the like is provided. The tip of the scraper 80 is directed along the tangential direction in a direction opposite to the rotation direction of the squeezing roll 52, and is rotated forward and reverse by an appropriate motor 82 so as to freely contact and separate from the roll surface. . When cleaning the ink, the motor 82 is energized to bring the scraper 80 into contact with the squeezing roll 52, whereby the ink or cleaning liquid transferred to the roll 52 is scraped up and removed. The removed ink or cleaning liquid is discharged to an 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, and the waste liquid discharged to the ink pan 78 is collected in a waste liquid tank provided at a required portion. When the ink is washed, the ink transfer roll 50 is displaced in the counterclockwise direction about the rotation axis of the squeezing roll 52 by the swing mechanism 53 provided in association with the ink transfer mechanism 48 as shown in FIG. Then, it is exposed to an ink washing position separated from the printing plate 42.

The scraper 80 is preferably made of a material having a hardness equal to or lower than the hardness of the squeezing roll 52 made of a flexible material such as rubber (for example, a rubber plate having a low hardness). Is brought into contact with the squeezing roll 52 to scrape the ink or the cleaning liquid.
2 is set to prevent damage. It is not always necessary that the entire scraper 80 is made of a soft material, and a separate soft material may be provided at the tip of the scraper 80. Although the tip of the scraper 80 in the illustrated example is directed in a direction opposite to the rotation direction of the squeezing roll 52, the present invention is not limited to this. Conversely, the scraper 80 may be configured to be able to freely contact and separate from the surface of the roll 52 in a state where the scraper 80 is directed in the forward direction with respect to the rotation direction of the squeezing roll 52. Further, a linear actuator such as an air cylinder can be used as a means for bringing the scraper 80 into contact with and separating from the squeezing roll 52.

[0026]

Next, the operation of the corrugated cardboard sheet printing machine according to the first embodiment will be described. As a preparatory work for printing, the swing mechanism 53 described above is operated, and the ink transfer roll 5 is rotated about the rotation axis of the squeezing roll 52.
0 is displaced clockwise. Thereby, as shown in FIG. 1, the ink transfer roll 50 of the ink transfer mechanism 48 is brought into contact with the plate cylinder 44 (printing plate 42). The scraper 80 is also separated from the squeezing roll 52. Furthermore, weir members 74, provided at both axial ends of both rolls 50, 52,
Numeral 74 is always at the lowered position, and closes both longitudinal ends of the ink storage section. Then, ink is supplied between the rotating ink transfer roll 50 and the squeezing roll 52 via a supply pipe 60 extending from the head 58. The ink is stored in a state where it is regulated by weir members 74, 74 facing the shaft ends of both rolls 50, 52.

As a result, an appropriate amount of ink is transferred to the surface of the printing plate 42 mounted on the plate cylinder 44 via the ink transfer roll 50. Under this condition, the cardboard sheets 43 are transferred one by one from the upstream stocker (not shown).
4 and the impression cylinder 46, the sheet 4
3 is subjected to required printing. Since the ink is quick-drying, it can be immediately sent to a post-process die cutter, folder glue or the like after printing. In addition, since the ink is distributed entirely between the ink transfer roll 50 and the squeezing roll 52, 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 ink to be used is changed in order to change the color accompanying a change in the print order, etc., the ink is washed in the following procedure. First, the supply pipe 6 in the head 58
The ink supply from 0 is stopped. At the time when the printing operation is completed and the cardboard sheet 43 is no longer passed between the plate cylinder 44 and the impression cylinder 46, the ink transfer roll 50 of the ink transfer mechanism 48 is rotated by the swing mechanism 53.
Automatically moves to the ink cleaning position separated from the plate cylinder 44 (printing plate 42) (see FIG. 2). Then, the motor 82 is energized to bring the scraper 80 into contact with the squeeze roll 52 at an appropriate pressure. When the ink transfer roll 50 and the squeezing roll 52 are idled at the same peripheral speed, the ink adhering to the surface of the squeezing roll 52 is scraped up and removed by the scraper 80, and the ink is collected in the ink pan 78. . Further, as described above, when a large amount of ink is consumed in the central portion in the axial direction of the ink storage portion A during the printing operation and a large amount of ink remains near both ends in the axial direction, the dam member 74 is moved to the air cylinder 72. May be raised by the reverse bias to open the ink storage section A, and the ink remaining on the shaft end side of the storage section A may be discharged to the gutter member 76. In this case, the ink scraping time can be reduced.

Although most of the ink remaining in the ink reservoir is removed by the scraper 80, a small amount of ink remains in the anilox of the ink transfer roll 50. Then, the scraper 80 is separated from the squeezing roll 52, and the cleaning liquid is supplied to the ink storage section A defined between the two rolls 50 and 52 via the cleaning liquid supply pipe provided in the supply device 54. Since the storage section A is closed at both ends in the longitudinal direction by the weir members 74, 74, the cleaning liquid is stored in a state of being entirely spread in the axial direction. In this state, the scraper 80 is again brought into contact with the squeezing roll 52 at an appropriate pressure, and the ink transfer roll 50 and the squeezing roll 52 are idled at the same peripheral speed. The cleaning liquid is scraped off and discharged to the ink pan 78. When the cleaning liquid is supplied to the ink reservoir A, the head 5 is supplied in the same manner as when the ink is supplied.
If the cleaning liquid is supplied while moving the roller 8 in the axial direction of both rolls 50 and 52, the time required for cleaning can be shortened, which is effective.

Further, the ink reservoir A may be opened by raising the weir members 74, 74, and the cleaning liquid stored in the reservoir A may be discharged from the shaft end. In order to further reduce the cleaning time, the cleaning waste liquid stored in the ink storing section A may be positively moved toward the end of the roll and discharged. For example, the head 58
The compressed air discharge port is disposed so as to be directed toward the ink storage section A, and the dam members 74 are raised to raise the storage section A.
Is released, the head 58 is moved in the axial direction of the rolls 50 and 52 while blowing compressed air from the discharge port. As a result, the cleaning waste liquid stored in the ink storage section A is positively moved toward the roll end by the compressed air, and can be discharged in a short time.

As described above, when the color is changed in accordance with the order change, the ink adhering to the ink transfer roll 50 can be reliably removed only by using a very small amount of cleaning liquid after scraping most of the ink with the scraper 80. . That is, order change can be performed in a short time, and it is possible to suitably cope with small lot printing of various kinds and small quantities, and ink can be saved. The amount of cleaning liquid used for ink cleaning was about 60 liters in the conventional flexographic printing press, but was about 100 cc when newly developed ink was used. It is possible to reduce pollution and greatly contribute to pollution prevention.

[0032]

FIG. 4 is a schematic side view of a printing press according to a second embodiment, in which a plate cylinder 44 and an impression cylinder 46 are shown.
The basic configuration of the ink supply device 54 is the same as that described with reference to FIGS. However, printing plate 42
The mechanism 48 for adjusting the amount of ink on the ink transfer roll 50 in the mechanism 48 for transferring ink to the ink is different. That is, an adjusting plate 110 as an adjusting member formed of a long plate is provided on a pair of support brackets 62, 62 on which the ink transfer roll 50 is rotatably supported, in a forward direction with respect to the rotation direction of the transfer roll 50. The tip is directed along the tangential direction. The adjustment plate 110 is connected to a motor 112, and the forward and reverse biases of the motor 112 allow the distance between the leading end and the roll surface to be adjusted so as to adjust the amount of ink on the surface of the ink transfer roll 50. Function. Note that the distance between the adjustment 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.

An ink reservoir A is defined above the ink transfer roll 50 and the adjusting plate 110 in the longitudinal direction of both members, and both longitudinal ends of the reservoir A are
It is configured to be always closed by the weir members 74, 74 described above. The longitudinal ends of the ink storing section A may be closed by an air curtain. For example, a pair of air blowing pipes connected to a blowing source face upwards near the both ends of the ink storage section A, and air is blown from the air blowing pipe toward the storage section A to dampen the ink or the ink cleaning liquid. stop.

A scraper 80 made of a long plate is disposed at a position close to the ink transfer roll 50, and the scraper 80 is connected to a fluid pressure cylinder 114 and can freely contact and separate from the roll surface. . Then, as shown in FIG. 5, when the scraper 80 comes into contact with the ink transfer roll 50, the ink transferred to the roll 50 is removed. The removed ink is discharged to an ink pan 78 provided below the scraper 80. The drive source of the scraper 80 may be a motor as in the first embodiment.

The ink transfer roll 50 is displaced between an ink transfer position at which the ink is transferred by bringing the ink transfer roll into contact with the printing plate 42 and an ink washing position at which the ink transfer roller 50 is separated from the printing plate 42 and cannot transfer the ink. The swing mechanism 53 is basically the same as in the first embodiment. However, each of the support brackets 62 is rotatably supported by the machine frame via a protruding shaft 116 that protrudes outwardly (on the side away from the other opposing support bracket 62). And the switching shaft 66
, The support brackets 62, 62 rotate about the protruding shafts 116, 116, and move the ink transfer roll 50 to the ink transfer position (FIG. 4) and the ink cleaning position.
(FIG. 5).

[0036]

Next, the operation of the corrugated cardboard sheet printing machine according to the second embodiment will be described. As a printing preparation operation, as shown in FIG. 4, the ink transfer roll 50 is brought into contact with the plate cylinder 44 (printing plate 42), and the scraper 80 is separated from the ink transfer roll 50.
Further, the gap between the tip of the adjusting plate 110 and the surface of the ink transfer roll 50 is adjusted to an appropriate value by urging the motor 112. Further, the weir members 74, 74 are always at the lowered position, and close both ends in the longitudinal direction of the ink storing section A. When ink is supplied between the adjusting plate 110 and the rotating ink transfer roll 50 via a supply pipe 60 extending from the head 58, the ink is stored in a state where the ink is regulated by the weir members 74, 74. Stored in section A.

Thus, an appropriate amount of ink is transferred to the surface of the printing plate 42 mounted on the plate cylinder 44 via the ink transfer roll 50. Under this condition, the cardboard sheets 43 are transferred one by one from the upstream stocker (not shown).
4 and the impression cylinder 46, the sheet 4
3 is subjected to required printing. Since the ink is quick-drying, it can be immediately sent to a post-process die cutter, folder glue or the like after printing. Further, since the ink spreads entirely between the ink transfer roll 50 and the adjustment plate 110, 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 ink to be used is changed in order to change the color accompanying a change in the printing order, etc., the ink is washed in the following procedure. First, the supply pipe 6 in the head 58
The ink supply from 0 is stopped. When the printing operation is completed and the cardboard sheet 43 is no longer passed between the plate cylinder 44 and the impression cylinder 46, the ink transfer roll 50 of the ink transfer mechanism 48 is moved by the swing mechanism 53 to the plate. It is automatically moved to the ink washing position separated from the cylinder 44 (printing plate 42) (see FIG. 5). Then, the fluid pressure cylinder 114 is urged to bring the scraper 80 into contact with the ink transfer roll 50 at an appropriate pressure. When the distance between the ink transfer roll 50 and the adjustment plate 110 is increased, most of the ink remaining in the ink storage unit A adheres to the surface of the transfer roll 50, and the ink is scraped up and removed by the scraper 80 to the ink pan 78. Is discharged.

Next, the scraper 80 is separated from the ink transfer roll 50, the distance between the adjusting plate 110 and the roll 50 is reduced, and the ink is transferred through the cleaning liquid supply pipe provided in the supply unit 54. The cleaning liquid is supplied to the storage section A. Since the storage section A is closed at both ends in the longitudinal direction by the weir members 74, 74, the cleaning liquid is stored in a state of being entirely spread in the axial direction. In this state, the scraper 80 is again brought into contact with the ink transfer roll 50 at an appropriate pressure, and the ink transfer roll 5
When the distance between the control roll 110 and the adjustment plate 110 is increased, the transfer roll 50
The cleaning liquid adhering to the surface is scraped up and removed by the scraper 80 and discharged to the ink pan 78. After the ink on the ink transfer roll 50 is scraped off by the scraper 80, the cleaning is performed by supplying the cleaning liquid to the ink reservoir A while keeping the scraper 80 in contact with the ink transfer roll 50. Is also good.

The supply device for selectively supplying the ink or the cleaning liquid is not limited to one as in the embodiment, and a plurality of supply devices may be arranged in series. In this case, since each supply device only needs to move in a short area, it is possible to quickly supply ink to a necessary portion of the ink storage unit. Further, one supply device may be fixedly arranged at a fixed position, or a plurality of supply devices may be fixedly arranged at predetermined intervals in the longitudinal direction of the ink storing section. Also shown in FIG.
In the embodiment, the ink transfer roll 50 and the squeeze roll 52
The gutter members 76, 76 disposed below both ends in the axial direction
Ink pan 78 collects the sunk ink
However, other configurations are possible. For example, FIG.
As shown in FIG.
Gutter members 76, 76 are configured to be able to store cleaning fluid.
And a drain pipe communicating with the drain tank to each gutter member 76.
86 without connecting the ink pan 78
And the cleaning liquid may be collected in the waste liquid tank.
No. The ink pan 78 or the two gutter members 76, 7
Separate the waste liquid or ink and cleaning liquid discharged from 6.
Collected in a common waste tank or a common waste tank.
Can be recovered. Also use multiple waste tanks.
In such cases, the capacity of the tank can be reduced.
You. This configuration can also be applied to the embodiment shown in FIG.
Things.

[0041]

As described above, the cardboard sheet printing machine according to the present invention uses a newly developed low-viscosity and quick-drying glycol-based ink so that it can be immediately sent to a post-process after printing. And the operator does not need to constantly monitor the printing state because color unevenness does not occur. Further, there is an advantage that the mechanism can be simplified since there is no need to constantly circulate the ink, and the ink can be supplied only to the necessary portions of the printing plate, so that the ink consumption can be reduced. When changing colors due to a change in print order, etc., supply the cleaning liquid between both rolls and
Since the waste liquid transferred to the printer can be reliably scraped and removed by a scraper , order change can be performed in a short time, and it is possible to suitably cope with various kinds of small lot printing. In addition, since there is no need to constantly circulate the ink as described above, the amount of washing waste liquid is extremely small, so that the ink can be largely saved and it is extremely advantageous from the viewpoint of preventing pollution. Also, since there is no need for an ink mixing or circulation mechanism,
Space saving and low cost can be realized. In addition,
Squeeze the roll against the surface below the center of rotation
And can be removed by a scraper.
There is no danger that the waste liquid will adhere to the squeeze roll again.
Can reduce the time required for removal.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a printing press according to a first embodiment of the present invention, showing a printing state on a cardboard sheet.

FIG. 2 is a schematic side view showing a state of ink washing after printing is completed in the printing press shown in FIG. 1;

FIG. 3 is a perspective view of a main part showing a schematic configuration of an ink transfer mechanism in the printing press shown in FIG.

FIG. 4 is a schematic side view of a printing press according to a second embodiment of the present invention, showing a printing state on a cardboard sheet.

FIG. 5 is a schematic side view showing a state of ink washing after printing is completed in the printing press shown in FIG. 4;

FIG. 6 is a side view schematically showing various roll arrangements in a pre-slot printing machine according to the related art.

FIG. 7 is a side view schematically showing various roll arrangements of a flexographic printing press according to the related art.

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

FIG. 9 is a schematic side view showing a modified example of the printing press according to the first embodiment of the present invention.

[Explanation of symbols]

 42 Printing plate 43 Corrugated cardboard sheet 44 Plate cylinder 46 Impression cylinder 50 Ink transfer roll 52 Squeezing roll 54 Supply device 72 Air cylinder 74 Weir member 80 Scraper 110 Adjustment plate

Continuation of the front page (56) References JP-A 1-257051 (JP, A) JP-A 60-1119539 (JP, U) JP-A 56-41645 (JP, U) JP-A 55-45568 (JP, U) , U) Japanese Utility Model Showa 62-78435 (JP, U) Japanese Utility Model Showa 57-121538 (JP, U) Japanese Utility Model Showa 60-119539 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB Name) B41F 35/00 B41F 35/04 B41F 31/02 B41F 31/20

Claims (4)

(57) [Claims] 1. A plate cylinder (44) equipped with a printing plate (42).
An impression cylinder (46) arranged opposite to the plate cylinder (44);
The printing cylinder (44) is disposed so as to be close to and away from the printing drum (44). When the printing cylinder (44) is close to the printing drum (44), the printing cylinder (44) rotates while being in contact with the printing plate (42) and transfers ink to the printing plate (42). Allowed
And at the time of separation, separate from the printing plate (42)
An ink transfer roll (50) for disabling ink transfer to the plate (42); and a squeezing roll (52) for constantly adjusting and rotating the ink amount while in contact with the ink transfer roll (50) during operation. And both ends in the longitudinal direction of the ink reservoir (A) which are arranged at both axial ends of the ink transfer roll (50) and the squeezing roll (52) and are defined between the two rolls (50, 52). A weir member (74, 74) that can be selected to be closed or closed and opened, and stored in the ink storage section (A) without being circulated.
The transferred ink is transferred to the printing plate (42) via the ink transfer roll (50), and the ink is transferred between the plate cylinder (44) and the impression cylinder (46) rotating in opposite directions. In a corrugated cardboard sheet printing machine configured to pass a corrugated cardboard sheet (43) and perform required printing on the sheet (43), the ink transfer roll (50) and the squeezing roll (5)
Supply means (2) for supplying ink and / or cleaning liquid which is movably arranged in the axial direction above the ink storage section (2) and which does not require a low-viscosity, highly-quick-drying circulation to the ink storage section (A); 5
And 4) extending parallel to substantially the entire length in the axial direction in proximity to the squeezing roll (52), and arranging so as to freely contact and separate from the surface of the roll (52) below the rotation center. Established
The portion directly in contact with the squeezing roll (52) is a scraper (80) made of a material having a hardness equal to or lower than the hardness of the squeezing roll (52), and is used for changing colors when a print order is changed. , The ink transfer
While the transfer roll (50) is separated from the plate cylinder (42) and the cleaning liquid is supplied to the ink reservoir (A), the scraper (80) is directly squeezed onto the surface of the squeezing roll (52). A printing machine for corrugated cardboard sheets, wherein the waste liquid transferred to the squeezing roll (52) is scraped off by rotating the squeezing roll (52) while making contact with the squeezing roll (52). 2. The scraper (80) is provided with the squeezing roll.
(52) Claim that is directed in a direction opposite to the rotation direction.
2. The printing press for corrugated cardboard sheets according to 1 . 3. The scraper (80) is provided with the squeezing roll.
2. The corrugated cardboard sheet printing machine according to claim 1 , wherein the printing machine is directed in a forward direction with respect to the rotation direction of (52). 4. An ink pan below the scraper (80) for collecting ink removed by the scraper (80).
(78) is disposed, and the ink and the ink cleaning liquid flowing out of the ink reservoir (A) are located below both ends in the axial direction of the ink transfer roll (50) and the squeezing roll (52). The cardboard sheet printing machine according to any one of claims 1 to 3, wherein a receiving gutter member (76) is provided, and the gutter member (76) is open toward the ink pan (78).