JP4671801B2 - Printing press with scraping blade - Google Patents

Description

  The present invention relates to a printing press having a scraping blade, and more particularly to a printing press capable of improving ink recovery efficiency and ink color change preparation efficiency.

Conventionally, a printing machine that transfers ink to a sheet such as a corrugated cardboard sheet through a printing plate on a roll has been used. In particular, in order to efficiently change the color of ink because of the necessity of dealing with recent small lots. In such a printing machine, it is desired to increase the efficiency of the ink collecting process after printing and the ink cleaning process.
Such a printing machine has a different structure depending on the type of ink used, and is roughly classified as follows.

  A printing machine that uses a low-viscosity and quick-drying flexographic ink is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-37857, and uses a flexographic ink in an ink reservoir defined by an ink transfer roll and an ink squeeze roll. And print. This printing machine has an ink pan under each end of both rolls, and during printing, the flexo ink in the ink reservoir is circulated through the ink pan to maintain a dynamic state and the ink solidifies. Is preventing. On the other hand, when collecting the ink, after collecting most of the ink remaining in the ink storage unit, a single scraping blade disposed in the ink storage unit so as to abut the side surfaces of both rolls is used in the axial direction of the roll. The recovery yield in the ink reservoir is improved by moving toward one end where the pan is provided. Further, when the ink is washed, after the ink is collected, the ink adhering to the ink reservoir and the roll is washed by supplying cleaning liquid or water into the ink reservoir.

  On the other hand, a high-viscosity glycol ink printer is disclosed in, for example, Japanese Patent Application Laid-Open No. 6-262755, and includes a glycol in an ink storage section defined by an ink transfer roll, an ink squeeze roll, and a pair of weir members. Print using ink. This printing machine has a single scraping blade disposed in the ink reservoir so as to contact the side surfaces of both rolls, as in the printing machine disclosed in JP-A-2000-37857. Is movable between one shaft end and the other shaft end in the axial direction of the roll, and has an air blowing nozzle with the blowing direction directed to the lower part of the blade on the moving direction advance side. According to such a printing machine, unlike the flexo ink printing machine, printing is performed without maintaining the ink in the ink reservoir in a dynamic state, unlike the flexo ink printing machine. Is possible. On the other hand, at the time of collecting ink, the yield of collecting ink in the ink storing section is obtained by blowing air from the air blowing nozzle while moving a single scraping blade in the axial direction of the roll toward one of the shaft ends. At the same time, it is possible to prevent ink from leaking to the blade movement direction delay side from between the scraping blade and the side surfaces of both rolls. Further, when the ink is washed, after the ink is collected, the ink adhering to the roll is washed by supplying a washing liquid or water into the ink reservoir.

As described above, in any type of printing machine, on the premise that the ink is squeezed by the ink squeeze roll, a scraping blade is provided in the ink storage section, and the scraping blade is rolled when collecting ink after printing. The recovery yield of the residual ink in the ink storage unit is improved by moving in the axial direction.
However, the conventional printing machine has the following technical problems.
As a first aspect, the efficiency of ink color change preparation is poor. More specifically, the ink recovery by the single scraping blade is performed on the ink that remains in the bottom of the ink storage part after recovering most of the ink remaining in the ink storage part after normal printing. . By collecting the ink while moving the single scraping blade in the roll axis direction, the ink adhering to the side surface of the roll is scraped off and guided into the ink reservoir, and is collected. When the ink storage section is defined by the weir member, the scraping blade is moved toward one of the weir members, thereby allowing the ink storage section to be partitioned by the scraping blade and one of the weir members. As a result, the liquid level of the ink rises, and it is possible to improve the ink recovery yield as a whole.

However, firstly due to the single scraping blade, the efficiency of the ink recovery process is low, and secondly due to the use of the scraping blade under the ink squeeze roll. Therefore, there is a technical problem in that the efficiency of the ink cleaning process is low.
Regarding the first point, the ink recovery cannot be completed until the single scraping blade is moved from one end to the other end in the roll axis direction, and the rising speed of the liquid level is slow. If the ink recovery nozzle is fixed to the scraping blade and recovered while moving in the axial direction together with the blade, the efficiency of ink recovery is reduced in order to secure the yield of ink recovery.

Regarding the second point, since the scraping blade partitions the ink storage part in the axial direction of the roll, rubber is usually attached to the curved side surface that contacts the side surface of the roll, and therefore, between the rubber and the side surface of the roll. Due to the high friction, the scraping blade is wound toward the bottom of the ink storing portion, that is, the rotating contact portion of both rolls by the rotation of the roll, and the blade itself may be damaged or the roll may be deformed. For this reason, while the scraping blade is installed in the ink reservoir, the rotation of the roll must be stopped. Therefore, the ink cleaning process, particularly the ink cleaning process that adheres to the side of the roll, It is necessary to carry out after the collecting step, and it is difficult to carry out the ink collecting step and the ink washing step in parallel. On the other hand, from the gap between the curved side surface of the scraping blade and the side surface of both rolls, the ink leaks to the side of the scraping blade that is delayed in the moving direction, thereby expanding the ink stain range on the side peripheral surfaces of both rolls. This adversely affects the subsequent ink cleaning process.
From the above, since the ink recovery efficiency is low and the ink recovery process and the ink cleaning process cannot be performed in parallel, the efficiency of the ink color change preparation is low, and it is not possible to cope with the recent small-lot production. It was enough.

  A second aspect is that it adversely affects printing after color change of ink. More specifically, by moving the scraping blade in the axial direction of the roll, the ink liquid level of the ink storage section on the movement advance side of the scraping blade rises, while the ink storage section on the movement delay side scrapes. As a result of scraping with the take-off blade, the moisture on the peripheral surface of the anilox roll is removed, and the side peripheral surface of the roll is dried over time. In particular, in the case of a quick-drying flexographic ink, an anilox roll having innumerable recesses on the entire peripheral side surface is adopted as an ink transfer roll, but the flexographic ink remaining in the innumerable recesses adheres to the surface of the anilox roll. Unlike ink, it is almost impossible to remove the ink by moving the scraping blade. Therefore, flexographic ink remaining in innumerable recesses tends to solidify in the recesses. Even if water is sprayed onto the surface of the anilox roll immediately after the ink is collected by the movement of the scraping blade, it is difficult to remove the flexographic ink once solidified. In this regard, when the ink is squeezed by the ink squeeze roll, as described above, the rotation of the anilox roll must be stopped while the scraping blade is moving. Even if moisture is supplied to the ink reservoir, it is difficult to keep the entire side peripheral surface of the anilox roll moisturized. When printing is performed using a new flexographic ink after cleaning, if the flexographic ink remaining in the concave portion is solidified and left, the new flexographic ink is not supplied to the concave portion, which may cause a printing failure.

  As a third aspect, there is a problem of roll wear caused by the scraping blade. More specifically, as described above, if the water is removed from the ink storage portion on the movement delay side due to the axial movement of the scraping blade, and the anilox roll is rotated during the movement of the scraping blade, In the contact portion with the ink squeeze roll, since there is no liquid sufficient to perform the lubrication function, the wear of the contact portion proceeds and the life of the printing press parts is shortened.

Accordingly, in view of the above problems of the prior art, an object of the present invention is to provide a printing machine capable of improving ink recovery efficiency and preventing the spread of ink stains on the roll side peripheral surface. There is to do.
An object of the present invention is to provide a printer capable of improving the efficiency of ink color change preparation by collecting ink that has not been used for printing and cleaning the ink transfer roll and doctor blade in parallel. Is to provide.
The object of the present invention is to clean the flexographic ink, clean the flexographic ink remaining in the numerous depressions on the side surface of the anilox roll, and suppress the progress of the anilox roll or doctor blade. It is to provide a printing machine for flexographic ink.

In order to solve the above problems, a printing machine according to the present invention includes:
An ink transfer roll for transferring ink to a printing plate, an ink squeezing member that extends in the axial direction of the ink transfer roll, and adjusts the amount of ink transferred by contacting the ink transfer roll, and the ink transfer roll And an ink reservoir defined by the ink squeezing member so as to extend in the axial direction of the ink transfer roll, an ink conduit having one end opening facing the ink reservoir, and the ink reservoir, A scraping blade provided in contact with each side surface of the ink transfer roll and the ink squeezing member, and a blade moving mechanism for moving the scraping blade in the axial direction, and stored in the ink storage section; In a printing machine that performs printing using ink,
The ink conduit has two ink recovery conduits, one end opening of one of the two ink recovery conduits is at one end of the ink reservoir, and the other end opening is the ink. Provided at the other end of the reservoir,
Further, a pair of scraping blades provided in contact with the side surfaces of the ink transfer roll and the ink squeeze body in the ink storage unit,
A blade moving mechanism for moving the pair of scraping blades in opposite directions toward the one end opening corresponding to the axial direction;
Each of the surfaces facing the pair of scraping blades has a cleaning liquid spray nozzle attached so as to be able to spray the cleaning liquid toward the side edge of the facing surface.

According to such a configuration, when collecting the ink remaining in the ink reservoir after printing, the pair of scraping blades are moved in the axial direction in opposite directions toward the one end opening of the corresponding ink collection conduit. Thus, each of the pair of scraping blades scrapes the ink adhering to the side peripheral surface of the ink transfer roll and the side surface of the ink squeezing body, and guides it into the ink storage section on the moving direction advance side of the pair of scraping blades. However, by collecting from the opening at one end by the ink collecting tube, the ink level in the ink reservoir is larger than when moving a single scraping blade axially from one shaft end to the other shaft end. It is also possible to reduce the restriction on the moving speed of the scraping blade due to the rising speed of the ink, so it is possible to improve the efficiency of ink recovery It made.
On the other hand, since the cleaning liquid spray nozzle moves together with the pair of scraping blades by spraying the cleaning liquid from the cleaning liquid spray nozzle provided on the facing surfaces of the pair of scraping blades toward the side edge of the facing surface, The cleaning liquid is ejected from the cleaning liquid ejecting nozzle toward the ink that has started to leak from the contact surface of the scraping blade and the side surfaces of the ink transfer roll and the ink squeezing body toward the delaying direction of the scraping blade. By ejecting the ink, it becomes possible to prevent the ink transfer roll of the leaked ink or the spread of the ink stain range on the side peripheral surface of the ink throttle body.

In addition, the ink squeezing body includes a doctor blade disposed so that a leading edge thereof is in axial contact with a side peripheral surface of the ink transfer roll, and the ink transfer roll includes the pair of scraping blades. Each is preferably rotated while being moved in opposite directions in the axial direction.
According to such a configuration, the surface of the pair of scraping blades facing each other from the cleaning liquid ejecting nozzle while rotating the ink transfer roll and moving the pair of scraping blades in the axial direction opposite to each other. By ejecting toward each side edge, the ink transfer roll is cleaned while cleaning the ink adhering to the entire side peripheral surface of the ink transfer roll without causing the pair of scraping blades to be caught below the ink reservoir. The cleaning liquid adhering to the side peripheral surface of the nozzle cleans the aperture edge of the diaphragm of the doctor blade that contacts the side peripheral surface of the ink transfer roll, and the cleaning liquid accumulated in the ink storage portion is made dynamic by the rotation of the ink transfer roll. Thus, the inner surface of the doctor blade that forms a part of the ink reservoir can be cleaned. Thereby, while moving the pair of scraping blades in the axial direction, it is possible to perform the recovery of the ink accumulated in the ink reservoir and the cleaning of the ink adhered to the ink transfer roll and the doctor blade in parallel. .

Further, the ink is made of flexographic ink, and the ink transfer roll is made of an anilox roll having a large number of recesses over the entire side peripheral surface, and the anilox roll and the anilox roll so that the flexographic ink is accumulated in the ink storage portion. It may further include a weir member provided at each end of the doctor blade, and spray water from the cleaning liquid spray nozzle.
According to such a configuration, by moving the pair of scraping blades in the axial direction opposite to each other, the low-viscosity flexographic ink is recovered while being dammed by the dam member, and the infinite number of recesses of the anilox roll Ink adhering to the side peripheral surface except the inside can be removed by a pair of scraping blades.
In that case, water is ejected from the water ejection nozzles toward the side edges of the opposing surfaces of the pair of scraping blades, thereby washing away the flexographic ink having quick-drying properties remaining in the innumerable recesses, thereby causing innumerable recesses. As the water is collected in the ink reservoir, the rotating contact part between the doctor blade and the anilox roll is moisturized, and the water functions as a lubricating liquid, which causes the surface of the expensive anilox roll to wear. It becomes possible to suppress.
At this time, in the next step, when printing is performed immediately after changing the color of the ink, water remaining in the infinite number of recesses can improve the compatibility of the new ink with the anilox roll. .
In the next process, when the main peripheral surface of the anilox roll is subjected to main cleaning, the flexographic ink remaining in countless recesses is prevented from solidifying so that the main cleaning can be performed efficiently. It is also possible to do.

Furthermore, the ink conduit connects the ink reservoir and the ink supply source so that flexographic ink can flow, and the ink conduit has an end portion for collecting each ink corresponding to the end of the ink reservoir. Two ink collection pipes arranged at one end, an ink supply one end opening for ink supply is arranged between the one end openings for ink collection, and an ink supply pipe facing the ink reservoir,
Thereby, at the time of printing, by supplying flexo ink from the ink supply source to the ink reservoir through the ink supply tube, the flexographic ink is recovered from the ink reservoir to the ink supply source through the ink recovery tube. , Maintaining the flexo ink in the ink reservoir in a dynamic state,
The blade moving mechanism is configured such that the pair of scraping blades correspond to each of the pair of scraping blades from an ink collection preparation position where each of the pair of scraping blades is located in the vicinity of the one end opening for ink supply. It is preferable to move in the opposite directions in the axial direction to the ink collection end position located in the vicinity of the one end opening for ink collection.
According to such a configuration, at the time of printing, it is possible to prevent the flexo ink from being solidified in the ink storage unit by circulating the flexo ink between the ink storage unit and the ink supply source. On the other hand, at the time of ink collection, the pair of scraping blades are moved toward the corresponding one end opening for ink collection, so that the quick-drying flexo ink in the ink reservoir can be quickly squeezed by the two ink collection tubes from both shaft ends. It can be recovered.

In addition, the doctor blade may be arranged to extend in the direction opposite to the rotation direction of the ink transfer roll.
Furthermore, the dam member has an internal flow path provided with a first outflow inlet at a lower portion of the inner surface facing the ink storage portion and a second outflow inlet at an upper surface of the dam member, The one end opening for collecting ink may communicate with the ink collecting pipe through the second outflow port.
Furthermore, the doctor blade comprises a doctor blade for ink squeezing and a doctor blade for scraping cleaning liquid,
And a crossbar extending in parallel with the ink transfer roll,
The crossbar has at least two inclined surfaces extending in the axial direction on the side surface, the doctor blade for ink squeezing is attached to one inclined surface, and the doctor blade for scraping cleaning liquid is attached to the other inclined surface,
And a first position where the ink squeezing doctor blade and the cleaning liquid scraping doctor blade are in contact with a side peripheral surface of the ink transfer roll; and the ink squeezing doctor blade and the cleaning liquid scraping doctor blade are the ink transfer roll. A crossbar rocking drive device for rocking the crossbar between a second position spaced from the side peripheral surface of the crossbar;
You may have a crossbar rotation drive device which rotates the said crossbar centering on a longitudinal direction.

A flexo ink printing machine according to an embodiment of the present invention will be described below in detail with reference to the accompanying drawings, taking as an example the case of printing a cardboard sheet.
FIG. 1 is a perspective view of a printing press according to a first embodiment of the present invention. FIG. 2 is a schematic side view of a printing unit of the printing machine of FIG. FIG. 3 is a diagram mainly showing a piping route of the printing machine of FIG. FIG. 4 is a schematic side view around the pair of scraping blades in FIG. 1. FIG. 5 is a schematic front view and a schematic side view of the ink blocking plate of FIG. FIG. 6 is a schematic front view showing the tubing pump. FIG. 7 is a schematic side view showing a tubing pump. FIG. 8 is a perspective view of the ink / cleaning liquid supply source switching device. FIG. 9 is a table showing a method of cleaning the constituent members when changing the ink color.

  As shown in FIG. 1, the printing press (10) includes an ink storage part (16) formed by an ink transfer roll (12) and a doctor blade (404, 406), and a lower part of the ink storage part (16). An installed ink supply source (302), an ink supply pipe (20) and an ink collection pipe (22, 24) for connecting flexographic ink to the ink reservoir (16) and the ink supply source (302). , A transfer pump (26A, B, C) for transferring ink in the ink supply pipe (20) and the ink recovery pipe (22, 24), and water in the ink supply pipe (20) and the ink recovery pipe (22, 24). A water supply pipe (28) for supplying water, and an air ejector (30A, B, C) for generating an air flow for removing and collecting the flexographic ink remaining in the ink supply pipe (20) and the ink collection pipe (22, 24). , Inn It is comprised roughly from a pair of scraping blade (102A, 102B) arrange | positioned so that a movement is possible in a storage part (16).

  As shown in FIG. 2, the ink reservoir (16) includes an ink transfer roll (12) and a doctor blade (404, 406) rotatably supported in contact with each other between a pair of machine frames (32, 34). And a pair of ink dam plates (36, 38) which are in sliding contact with both ends of the ink transfer roll (12) and the doctor blades (404, 406) and are fixed to a pair of machine frames. The ink transfer roll (12) and the doctor blade (404, 406) are positioned to abut during printing. The ink transfer roll (12) is an anilox roll having innumerable concave portions provided over the entire side peripheral surface thereof. A plate cylinder (40) is rotatably supported on the machine frame (32, 34) below the ink transfer roll (12), and a printing plate (42) in contact with the ink transfer roll (12) on the outer surface thereof. Is attached. Below the plate cylinder (40), the impression cylinder (44) is rotatably supported, and the corrugated cardboard sheet S supplied between the plate cylinder (40) and the impression cylinder (44) is printed on the printing plate (42). The flexographic ink is transferred by contacting with. The corrugated cardboard sheet to which the flexo ink has been transferred is sent to the next process by a pair of feed rolls (46, 48).

  As shown in FIG. 1, the ink supply source (302) is a container capable of storing ink, and is installed at the lowermost end. Each of the ink supply pipe (20) and the ink recovery pipe (22, 24) described later is provided. The end opening is positioned so as to face the inside of the ink supply source (302). Each time the color of the ink is changed, it is necessary to replace the ink supply source (302) filled with the desired color ink.

  As shown in FIG. 2, the crossbar (400) extends longitudinally parallel to the ink transfer roll (12) and has a square cross section. Each of the four corners is chamfered so as to form an inclined surface (402A, B, C, D) extending in the longitudinal direction, and one of the diagonally opposed corner inclined surfaces (402A, C) has an ink diaphragm The cleaning blade scraping doctor blade (406) is fixed to the other doctor blade (404). The leading edges of the ink squeezing doctor blade (404) and the cleaning liquid scraping doctor blade (406) are rotated in the direction of rotation of the ink transfer roll (12) when a cross bar (400) as described later is in the first position. Against the surface of the ink transfer roll (12) in a direction opposite to the surface of the ink transfer roll (12), the inner surface of the ink squeezing doctor blade (404) or the cleaning liquid scraping doctor blade (406), The ink reservoir (16) is formed by the side surfaces of the pair of blocking members (36, 38) and the cross bar (400). This improves the squeezing function of the ink transferred to the ink transfer roll (12) by the ink squeezing doctor blade (404) in the printing process, while the ink transfer by the cleaning liquid scraping doctor blade (406) in the cleaning process. The scraping function of the cleaning liquid adhering to the roll (12) is improved. The material of the ink squeezing doctor blade (404) is made of metal, while the material of the cleaning liquid scraping doctor blade (406) is preferably made of synthetic resin, but is not limited to this. As long as the squeezing or cleaning liquid scraping function is satisfactorily achieved, an appropriate material may be selected according to the type of ink, viscosity, and the like. In this way, by using the doctor blade separately for ink squeezing and cleaning liquid scraping, the abrasion progress of the expensive ink squeezing doctor blade is suppressed, while cleaning liquid scraping that requires less precision than the ink squeezing. Doctor blades can be handled with inexpensive materials.

  The crossbar (400) has a first position (indicated by a solid line in FIG. 2) where the crossbar (400) is close to the ink transfer roll (12) with the lower pivot position (408) of the crossbar (400) as the center. , Swingable between a second position (indicated by a dotted line in FIG. 2) where the crossbar (400) is spaced from the ink transfer roll (12), while opening the plunger (not shown). Thus, it can be manually rotated around the central axis of the square cross section. With such a configuration, when the cross bar (400) is in the first position, the ink squeezing doctor blade (404) or the cleaning liquid scraping doctor blade (406) is in contact with the surface of the ink transfer roll (12). When the crossbar (400) is in the second position, the doctor blade (404) contacts the ink transfer roll (12) by rotating the crossbar (400) by opening the plunger. , 406) can be selected as either an ink squeezing doctor blade (404) or a cleaning liquid scraping doctor blade (406).

According to such a configuration, when the ink squeezing doctor blade (404) is pressed against the ink transfer roll (12) during the printing process, the cleaning liquid scraping doctor blade (406) Since it is located on the side away from the roll (12), the cleaning liquid scraping doctor blade (406) can be easily accessed, so that the cleaning liquid scraping doctor blade (406) is maintained during the printing process. Inspection or replacement is possible. Similarly, during the cleaning process, maintenance inspection or replacement of the ink squeezing doctor blade (404) is possible.
When the cross bar (400) is in the first position, the leading edge of the ink squeezing doctor blade (404) or the cleaning liquid scraping doctor blade (406) extends over the entire length of each end of the cross bar (400). A pressing means (not shown) such as a provided piston cylinder mechanism is pressed against the surface of the ink transfer roll (12) with a predetermined pressing force.
As shown in FIG. 1, the ink supply pipe (20) is routed so that one opening faces the ink reservoir (16) and the other opening faces the ink supply source (302). The inner diameter and length of the ink supply pipe (20) may be appropriately determined according to the ink supply amount, the distance between the ink supply source (302) and the ink storage section (16), etc. It is made of transparent resin with a length of about 5 meters. In the ink supply pipe (20), the bracket (50) that supports the ink supply pipe (20) is measured in the direction from the ink reservoir (16) to the ink supply source (302), and the viscosity of the flexo ink described later is measured. A viscometer (52), a transfer pump (26A), which will be described later, and an open / close valve (54A) are attached. In the vicinity of the upper portion of the ink reservoir (16), a screw shaft (56) extends axially along the roll (12) while being screwed into the bracket (50). A drive motor (58) is attached, and the other end (not shown) is supported by a pair of machine frames (32, 34). By driving the drive motor (58), the screw shaft (56) rotates, whereby one opening of the ink supply pipe (20) can move along the ink reservoir (16). . The level of one opening is at least lower than the ink liquid level formed during printing and the cleaning liquid level formed during cleaning so that the ink and cleaning liquid stored in the ink reservoir (16) can be collected. Should be set. Note that the level of one opening may be movable in the vertical direction so that the level can be adjusted according to the liquid level.

  The water supply pipe (28) is above the ink storage part (16), and is divided into a straight pipe part (60) along the longitudinal direction of the ink storage part (16) and three branches branched from the straight pipe part (60), respectively. It is routed by the pipe part (62A, B, C). The straight pipe part (60) is provided with a valve (154) on the upstream side of the branch part. There are three branch positions, one in the vicinity of one end in the longitudinal direction of the ink reservoir (16), a substantially central portion, and a portion in the vicinity of the other end. A moisture supply source (64) is connected to the end opening of the straight pipe part (60), and the end opening of the branch pipe part (62A) at the substantially central part communicates with the ink supply pipe (20), while both end parts The end openings of the nearby branch pipe portions (62B, C) communicate with the ink recovery pipes (22, 24), respectively. With respect to the branch pipe section (62A), a moisture measuring device (66A) and an open / close valve (68A) are installed in a direction from the straight pipe section (60) to the ink storage section (16). With such a configuration, the water supply interval is appropriately changed by opening and closing the on-off valve (68A) while measuring the amount of water supplied through the ink supply pipe (20) by the water amount measuring device (66A). It becomes possible.

  Further, the water supply pipe (28) is connected to the water spray pipe (158) via a branch pipe (156) provided with a valve (152). The water sprinkling pipe (158) is arranged to extend in the axial direction of the roll (12) above the ink reservoir (16), and has a plurality of cleaning water jet nozzles (160) spaced apart from each other in the axial direction. Each cleaning water spray nozzle (160) is directed downward, and sprays cleaning water directly toward the ink reservoir (16), particularly toward the side surface of the ink transfer roll (12), so that the side surface is printed. The residual ink adhering to the ink is removed. The interval between adjacent cleaning water jet nozzles (160) may be determined as appropriate according to the amount of ink adhering to the roll (12). The washing water injection nozzle (160) may be movable in the axial direction. In addition, when using water as washing water, you may supply water from the several hole provided in the water spray pipe (158), without providing an injection nozzle.

  Below the roll (12), a primary high-pressure air supply pipe (70) is connected to a high-pressure air source (72) having an end opening of approximately 5 (kg / cm 2), and like the water supply pipe (28), Routing is performed by the straight pipe portion (74) and the three branch pipe portions (76A, B, C) branched from the straight pipe portion (74). Each branch pipe portion (76A, B, C) is connected to the air ejector (30A, B, C) through the on-off valve (78A, B, C) so as to be able to communicate therewith. The primary input side of the air ejector (30A) and the ink reservoir (16) side of the open / close valve (54A) of the ink supply pipe (20) are connected by a side path (80A), and the side path (80A) is opened and closed. A valve (82A) is installed, while the secondary output side of the air ejector (30A) is connected to the ink supply source (302) side of the open / close valve (54A) via a side path (84A).

  The air ejector (30) is conventionally known, and its operating principle is as follows. The air ejector (30) has a diffuser (not shown) inside and a diffusion chamber (not shown) communicating with the throttle side of the diffuser, and is throttled by a nozzle (not shown) in the diffusion chamber. When the primary compressed air is sent through the open / close valve (78), it expands and flows into the diffuser at a high speed. As a result, the pressure in the diffusion chamber decreases, and this pressure difference causes the air from the secondary side to open and close. It is drawn through the valve (82), mixed with the primary air ejected at high speed, passes through the diffuser, and is returned to the ink supply pipe (20) through the side passage (84).

  Next, the transfer pump (26A) will be described. As shown in FIG. 6 and FIG. 7, the rotational pressure is applied to the outer peripheral surface of the flexible tube so that the inside of the ink supply pipe (20) is filled. A conventionally known tubing pump for transferring flexographic ink. A motor (92) fixed to a base (90) has a rotor (94) for energizing rotational pressure on the outer peripheral surface of the ink supply pipe (20). A support device (98) supporting the ink supply pipe (20) is attached to the rod of the air cylinder (96) fixed to the base (90). The support device (98) moves along the guide bars (100, 102) fixed to the base (90) and fitted to both ends of the support device (98) by driving the air cylinder (96). The rotor (94) is configured to be close to and away from the rotor (94). When the flexo ink is transferred from the ink supply source (302) to the ink reservoir (16) by such a tubing pump, the support device (98) is brought close to the rotor (94) and the ink supply pipe (20 ) Is applied to the outer peripheral surface to transfer the flexographic ink. By switching the rotation direction between forward and reverse, the flexo ink transfer direction is from the ink supply source (302) toward the ink reservoir (16) and from the ink reservoir (16) toward the ink supply source (302). It is possible to switch between.

When releasing the rotational pressure urged by the ink supply pipe (20), the support device (98) is separated from the rotor (94) and released from squeezing by the rotor of the ink supply pipe (20). The means for moving the support device (98) close to and away from the rotor (94) may be replaced with an appropriate means such as a screw shaft in addition to the air cylinder. When the diameter of the ink supply pipe (20) changes, the biasing force by the rotor (94) can be adjusted by adjusting the position of the support device (98) with respect to the rotor (94).
The configuration around the collection pipes (22, 24) is basically the same except that the ink flow is in the opposite direction to the ink supply pipe (20). Are given the same reference numerals, and the description thereof will be omitted. Hereinafter, differences from the supply pipe (20) will be described in detail.

  As apparent from FIGS. 1 and 3, first, the viscometer (52) is installed in the supply pipe (20), but not in the recovery pipe (22, 24). Secondly, the tubing pump (26A) is provided on the ink supply source (302) side in the supply pipe (20), whereas the tubing pump (26B, 26) is provided in the collection pipe (22, 24). C) is provided on the ink storage part (16) side, and thirdly, the recovery pipes (22, 24) communicate with the pair of ink blocking plates (38, 36).

  Regarding the first difference, it is advantageous to install the viscometer (52) in the supply pipe (20) in that the viscosity of the ink can be detected before printing and / or during printing. If it is only necessary to detect the viscosity of the ink when the ink is collected, it may be installed in the collection pipe (22, 24).

  Regarding the second difference, from the viewpoint of reducing the resistance of the fluid as much as possible when the fluid is fed by the tubing pump, the supply pipe (20) is disposed on the ink supply source (302) side, and the collection pipe (22, 22). About 24), it installs in the ink storage part (16) side.

  Regarding the third difference, as shown in FIG. 5, the pair of ink blocking plates (38, 36) includes an outer edge (206) of the ink transfer roll, a doctor blade (404, 406), and a cross bar (400), respectively. A flow path (210) communicating with an inflow / outflow opening (204) provided in a lower portion of the inner surface (202) facing the ink storage portion (16) defined by the outer edge (208) of the ink is provided. The inflow / outflow opening (204) is provided in the vicinity of the bottom of the ink reservoir (16), that is, in the lower part of the inner surface (202). From the viewpoint of improving the recovery yield of the ink or cleaning liquid remaining in the ink reservoir (16), the position of the inflow / outflow opening (204) is preferably as close as possible to the bottom of the ink reservoir (16). The internal flow path (210) is bifurcated inside the ink blocking plate. One is a first connection opening (214) provided on the upper surface (205) of the ink damming plate, and the other is a second connection opening (216) similarly provided on the upper surface (205) of the ink damming plate. Communicate. The internal flow path (210) is connected to the ink recovery pipes (22, 24) via the first connection opening (214), while the water supply pipe (62B) is connected via the second connection opening (216). 62C). According to such a configuration, when the ink pan type printing machine is remodeled into a type having a pair of ink damming plates, the ink dam plate and the water supply line are respectively set to the ink dam plates (36, 38). By simply connecting to the first connection opening (214) and the second connection opening (216), the position of the outflow / inflow opening (204) can be easily fixed and supported by the ink / water conduit. ) Can be positioned in the vicinity of the bottom portion, and thus efficient remodeling can be realized.

  The pair of scraping blades (102A, 102B) has a shape that partitions the ink reservoir (16) in the axial direction when positioned in the ink reservoir (16), as shown in FIG. More specifically, as shown in FIG. 4A, the first curved side surface (101A, 101B) and the second curved side surface (109A, 109B) are tapered downward, and the first curved side surface ( 101A, 101B) on the side surface of the ink transfer roll (12), the second side surface (109A, 109B) is the inner surface, the third side surface of the ink squeezing doctor blade (404) (cleaning liquid scraping doctor blade (406)). (109A, 109B) are in contact with the side surfaces of the cross bar (400). As will be described later, the height of each blade (102A, 102B) is scraped with the ink blocking plate (36, 38) when the scraping blade (102A, 102B) is moved toward the axial end of the roll. What is necessary is just to set so that the liquid level stopped with a blade (102A, 102B) may not overflow.

  As shown in FIG. 4 (B), the pair of scraping blades (102A, 102B) are respectively attached to the support arms (104A, 104B), and the support arms (104A, 104B) are respectively moved up and down (106A). 106B). Both the lifting mechanisms (106A, 106B) are configured to move the lifting platform (108A, 108B), to which the support arms (104A, 104B) are attached, up and down by driving a cylinder (not shown), and the lifting platform (108A, 108B). ) Is moved up and down to move the pair of scraping blades (102A, 102B) into a lower operating position where ink or cleaning liquid can be scraped off in the ink reservoir (16), and upward standby to retract from the ink reservoir (16). Reciprocal movement between positions is possible.

  The elevating mechanisms (106A, 106B) are respectively provided in the moving mechanisms (110A, 110B), and the moving mechanisms (110A, 110B) are provided with a pair of scraping blades (102A, 102B) via the elevating mechanisms (106A, 106B). 102B) is configured to move linearly in the axial direction of the roll. More specifically, the rotary shaft (116A, 116B) screwed to the lifting mechanism (106A, 106B) is supported by the machine frame (112A, 112B) via the bearing (114A, 114B) in the roll axis direction. The rotating shafts (116A, 116B) extend and are connected to a rotating motor (122) supported on the machine casings (112A, 112B) via brackets (120). The rotating shafts (116A, 116B) are threaded in opposite directions at portions corresponding to the pair of scraping blades (102A, 102B), and the rotating shaft (116A, 116B) is rotated by the rotating motor (122). Thus, the pair of scraping blades (102A, 102B) are moved in the roll axis direction in opposite directions. More specifically, the pair of scraping blades (102A, 102B) includes a first axial position facing each other across one opening of the ink conduit (20) and the pair of scraping blades (102A). 102B) Each of the roll shaft ends can be reciprocated in the axial direction between the corresponding roll shaft ends, more precisely, the second position in the axial direction, which is the position immediately before contacting the inner surface of the ink blocking plate (36, 38). Yes.

As shown in FIG. 4B, the pair of scraping blades (102A, 102B) can spray the cleaning liquid toward the surfaces (103A, 103B) opposed to the pair of scraping blades (102A, 102B), respectively. The cleaning liquid injection nozzles (105A, 105B) are attached in this manner. As shown in FIG. 1, each of the cleaning liquid injection nozzles (105A, 105B) is connected to a moisture supply source (64) through cleaning liquid supply pipes (111A, 111B) and an open / close valve (113). The direction of the nozzles of the liquid jet nozzles (105A, 105B) is downward, and has an angle range that can be sprayed on the side peripheral surface of the ink transfer roll (12) and the inner side surface of the doctor blade (404, 406). Thus, when the pair of scraping blades (102A, 102B) moves in the axial direction of the roll, the cleaning liquid spray nozzles (105A, 105B) move with the corresponding scraping blades (102A, 102B), thereby Part of the ink reservoir (16) sandwiched between the scraping blade (102A) and the ink damming plate (36), and sandwiched between the scraping blade (102B) and the ink damming plate (38). A pair of scraping blades (102A, 102B) is directed from a part of each ink reservoir (16) toward a part of the ink reservoir (16) sandwiched between the pair of scraping blades (102A, 102B). Ink leaks from between the curved side and the side of the ink transfer roll (12) and doctor blade (404, 406). , So that the preliminary cleaning of the ink deposited on the ink transfer roll (12) and a doctor blade (404, 406) can be performed in parallel with the recovery of the ink.
Next, the ink / cleaning liquid supply source switching device (300) will be described with reference to FIG. The ink / cleaning liquid supply source switching device (300) includes an ink supply source (302), a cleaning liquid recovery source (304) aligned with the ink supply source (302), an ink supply source (302), and a cleaning liquid recovery source (304). There are a bracket (306) that fixes and supports the air cylinder (308), and an air cylinder (308) that reciprocates the bracket (306) in the direction of the arrow in the lateral direction. Inside the cleaning liquid recovery source (304), a cylindrical net (310) having an opening area capable of receiving the tip of the pipe is provided by the number of ink pipes, and the net (310) includes a net ( A brush (312) extending from the inner wall to the center of the nozzle 310 is provided, and the tip is cleaned when the tip of the nozzle is inserted into the net (310).

With such a configuration, when ink is supplied into the ink storage section (16) or when ink is recovered from the ink storage section (16), the lower end opening position of the ink recovery pipes 20, 22 and 24 is the ink position. The air cylinder (308) is driven to face the opening of the supply source (302) to move the bracket (306), and thus the ink supply source (302) to a predetermined position, and then the lower end opening position is set to the ink supply source. In (302), move down to a predetermined level. On the other hand, when recovering the cleaning liquid in the ink reservoir (16), the air cylinder (308) is driven so that the lower end opening position of the ink recovery pipes 20, 22 and 24 faces the opening of the cleaning liquid recovery source, After moving the bracket (306) and thus the cleaning liquid recovery source (304) to a predetermined position, the lower end opening position of each recovery pipe is housed in the net (310) and moved downward to a predetermined level. It is possible to efficiently clean the tip of the tube using the cleaning liquid sprayed from the hole provided in the tip of the tube inside the net (310). In particular, when the color of the ink is changed, the ink of the old order adhered to the tip nozzle of the ink tube by washing the tip nozzle of the ink tube in this way in the cleaning liquid recovery step which is the final step as color preparation. However, it is possible to immerse the tip nozzle of the ink tube as it is in the ink stored in the ink supply source (302) of the new order without being mixed with the new order of ink and changing the color.
When changing the ink color, the ink supply source (302) of the old order is removed from the bracket (306), and the ink supply source (302) of the desired color of the new order is simply installed on the bracket (306). Good.

  The operation of the printing press of the present invention having the above-described configuration will be described by dividing it into a pre-printing stage, a printing stage, an ink removal and collection stage after printing, and a washing stage. The ink removal and collection stage further comprises a main ink collection stage, and an ink collection stage using a scraping blade and an air ejector. The cleaning stage includes a cleaning stage using a water spray pipe, a cleaning blade and a cleaning liquid using an air ejector. It consists of a recovery stage.

(I) Pre-printing stage In the pre-printing stage, first, various valves are operated. More specifically, the opening / closing valve (54A) is opened to allow flexo ink to flow into the ink supply pipe (20), while the opening / closing valve (82A) is closed to allow the flexo ink to flow into the side passage (80A). In addition, the on-off valve (78A) is closed to prevent the flow of high pressure air from the high pressure air (72) into the air ejector (30A). Next, the air cylinder (96) of the transfer pump (26A) is driven, and the support device (98) is moved to the rotor so that the rotational pressure of the rotor (94) is biased to the outer peripheral surface of the ink supply pipe (20). (94). Further, the valve (152), the valve (154), the open / close valve (113) and the open / close valve (68A) are closed to prevent water from the water supply pipe (28) from flowing into the ink reservoir (16). . The pair of scraping blades (102A, 102B) is positioned at the upper standby level at the first position in the axial direction. Further, the crossbar (400) is swung from the first position to the second position around the lower pivot position (408), the plunger is released at that position, and the crossbar (400) is manually rotated. As shown by the arrow in FIG. 2, the ink squeezing doctor blade (404) is rotated to the circumferential angular position of the cleaning liquid scraping doctor blade (406). Next, the cross bar (400) is swung from the second position to the first position about the lower pivot position (408), and the ink squeezing doctor blade (404) is moved against the ink transfer roll (12) by the pressing means. Press.

(II) Printing Stage In the printing stage, the flexographic ink stored in the ink supply source (302) is supplied to the ink storage section (16) by operating the transfer pump (26A). At this time, by adjusting the rotation of the transfer pumps (26B, 26C), the ink recovery pipe is used as an ink supply pipe, and the flexo ink is transferred from the ink supply source (302) to the ink storage section by three ink transfer pipes. To (16). The supplied flexographic ink is stored in the ink storage section (16) without leaking from the ends of both rolls (12, 14) by the pair of ink blocking plates (36, 38). The stored flexographic ink is applied to the peripheral surface of the rotating ink transfer roll (12) in which a part of the peripheral surface is immersed in the ink reservoir (16), and is supported rotatably on the machine frame (32, 34). The printed plate cylinder (40) is transferred to the printing plate (42) and printed on the cardboard sheet S.

During printing, the ink supply pipe (20) continuously supplies more flexo ink than that used for printing on the corrugated cardboard sheet S, and the flexographic ink is immersed in both ends of the ink reservoir (16). By rotating the tubing pumps (26B, 26C) that engage with the (22, 24), the ink reservoir (16) via the internal flow paths (210) of the pair of ink blocking plates (36, 38). Of flexo ink is continuously collected in the ink supply source (302).
In this way, ink supply and recovery are continuously performed so that the flexo ink circulates between the ink supply source (302) and the ink reservoir (16) to maintain the dynamic state of the ink. As a result, the quick-drying flexographic ink is prevented from solidifying in the ink reservoir (16), and the viscosity of the flexographic ink is adjusted to the position in the width direction of the ink reservoir (16), the ink supply pipe (20) or Depending on the position of the ink collection tube (22, 24), it is possible to prevent printing unevenness. Further, the drive motor (58) is activated to rotate the screw shaft (56), thereby moving the bracket (50) supporting the ink supply pipe (20) along the longitudinal direction of the ink reservoir (16). The flexographic ink stored in a specific position of the ink storage unit (16) may be positively given a dynamic state. As described above, printing of one lot of cardboard sheets is completed.

(III) Ink Removal / Recovery Step (a) Ink Main Recovery Step In the ink removal / recovery step, first, the flexo ink remaining in the ink reservoir (16) is recovered to the ink supply source (302). More specifically, by continuing the operation of the tubing pumps (26B, 26C), the ink supply source (16) is supplied from the ink reservoir (16) via the internal flow path (210) and the ink recovery pipes (22, 24). 302) Collect the flexographic ink. At that time, the rotation of the transfer pump (26A) engaged with the ink supply pipe (20) is reversed from that during printing, and the ink supply pipe (20) is used as an ink recovery pipe, so that the flexo ink in the ink storage section (16) is used. Are collected in the ink supply source (302). This makes it possible to further reduce the time for collecting the flexo ink remaining in the ink reservoir (16).

(B) Ink collecting stage by scraping blade A pair of scraping blades (102A, 102B) at the first position in the axial direction as well as starting to collect the flexographic ink in the ink reservoir (16) to the ink supply source (302). Is moved downward from the upper standby level to the lower operation level, and the ink remaining in each of the ink reservoirs (16) partitioned into three locations by the immersion of the pair of scraping blades (102A, 102B) is supplied to the ink. The ink is collected in the ink supply source (302) by the tube (20) and the ink collection tubes (22, 24). Next, the pair of scraping blades (102A, 102B) are moved in the opposite directions in the axial direction toward the second axial position, that is, the corresponding shaft end, and the cleaning liquid is ejected from the cleaning liquid ejection nozzles (105A, 105B). Water is sprayed toward the side peripheral surface of the ink transfer roll (12) and the inner surface of the ink squeezing doctor blade (404). As a result, the pair of scraping blades (102A, 102B) adheres to the entire side peripheral surface of the ink transfer roll (12) excluding the innumerable recesses and to the side surface of the ink squeezing doctor blade (404). The remaining ink is scraped off and guided to the residual ink blocked by the pair of ink blocking plates (36, 38) and the pair of scraping blades (102A, 102B), and the pair of scraping blades (102A, 102B). ), The residual ink level gradually rises, and the residual ink can be collected with good yield through the inflow / outlet opening (204) of the ink blocking plate.

In this case, since the cleaning liquid ejecting nozzles (105A, 105B) move together with the pair of scraping blades (102A, 102B), the contact surfaces of the pair of scraping blades (102A, 102B) and the ink transfer roll (12 ) And the ink squeezing doctor blade (404), and the cleaning liquid ejecting nozzle (105A) toward the ink that has started to leak toward the movement direction delay side of the pair of scraping blades (102A, 102B). , 105B) to prevent the spread of the ink smudge area on the side peripheral surface of the ink transfer roll (12) (and the ink squeezing doctor blade (404)) of the leaked ink by jetting water from It becomes possible to do.
Furthermore, without causing the pair of scraping blades (102A, 102B) to be caught below the ink reservoir (16), the flexographic ink having quick drying properties remaining in the innumerable recesses is washed away so that the innumerable recesses are washed away. While cleaning, the tip end edge of the ink squeezing doctor blade (404) contacting the side peripheral surface of the ink transfer roll (12) is cleaned with water adhering to the side peripheral surface of the ink transfer roll (12). The inner surface of the ink squeezing doctor blade (404) that forms a part of the ink reservoir (16) in which the water accumulated in the ink reservoir (16) is brought into a dynamic state by the rotation of the ink transfer roll (12). Can be cleaned. Accordingly, the ink collecting unit 16 recovers ink while the pair of scraping blades 102A and 102B are moved in the axial direction, and the ink transfer roll 12 and the ink squeezing doctor blade 404. Ink adhering to the ink can be cleaned in parallel.

In addition, when water accumulates in the ink reservoir (16), the rotational contact portion between the ink squeezing doctor blade (404) and the ink transfer roll (12) is moisturized, and the water functions as a lubricating liquid. It becomes possible to suppress the progress of wear on the surface of the ink transfer roll (12), which is an expensive anilox roll, and on the tip edge (404) of the doctor blade for ink squeezing.
Further, in the next cleaning step, as will be described later, when the side peripheral surface of the ink transfer roll (12) is finally cleaned with water from the water spray pipe (158), it remains in innumerable recesses until then. It is also possible to prevent the flexographic ink from solidifying and to perform the main cleaning efficiently. On the other hand, for example, the ink transfer roll (12) or the ink squeezing doctor blade (404) is sufficiently cleaned by water ejection from the cleaning liquid ejection nozzles (105A, 105B) of the pair of scraping blades (102A, 102B). If the main cleaning can be omitted with water from the sprinkling pipe (158), the water remaining in the infinite number of recesses improves the compatibility of the new ink with the anilox roll (12), thereby reducing the color. It is also possible to prevent defective printing immediately after the replacement.
In addition, the water is sprayed from the cleaning liquid spray nozzles (105A, 105B) toward the facing surfaces (103A, 103B) of the pair of scraping blades (102A, 102B) and the inner surface of the crossbar (400), thereby facing each other. Ink adhering to the surface and the inner surface can be removed and washed.

(C) Ink collection stage by air ejector Next, the transfer pump (26A) engaged with the ink supply pipe (20) is stopped, the air cylinder (96) is driven, and the support device (98) is moved to the rotor ( 94), the ink supply pipe (20) is stopped from being squeezed by the rotor (94), and the valve (154) and the open / close valve (68A) are opened.
At this time, ink recovery is continuously performed on both outer side portions of the ink storing portion (16) partitioned by the scraping blade (102A, 102B).
Next, the open / close valve (82A, 82B, 82C) and the open / close valve (78A, 78B, 78C) are opened, and the air ejector (30A) and the ink recovery pipe (22, 24) connected to the ink supply pipe (20). High pressure air is supplied from a high pressure air source (72) to each of the air ejectors (30B, 30C) connected to the. By supplying high-pressure air as primary air to the air ejector, the ink supply pipe (20) and the ink recovery pipes (22, 24) from the ink reservoir (16) to the air ejectors (30A, 30B, 30C) are provided. Inside, a high-speed air flow is generated toward the ink supply source (302). On the other hand, the water supply pipe (28) is controlled by opening the valve (154) and controlling the open / close valves (68A, 68B, 68C) almost simultaneously with the supply of high-pressure air to the air ejectors (30A, 30B, 30C). From the above, water is added to the ink supply pipe (20) and the ink recovery pipes (22, 24) at appropriate time intervals. The time interval for adding water is adjusted by opening and closing the on-off valves (68A, 68B, 68C) connected to the water supply pipe (28). The appropriate time interval depends on, for example, the amount of flexographic ink adhering in the ink supply pipe (20) and the ink recovery pipe (22, 24), the high-speed air flow generated by the air ejectors (30A, 30B, 30C), and the like. Can be determined. Thus, by adding moisture, the flexographic ink whose moisture has evaporated by the high-speed air flow is solidified on the inner wall of the ink supply pipe (20) or the ink recovery pipe (22, 24) and adhered to the inner wall. The flexo ink remaining in the ink supply pipe (20) and the ink recovery pipe (22, 24) is removed from the pipe and recovered to the ink supply source (302), and the ink supply pipe (20) and the ink recovery pipe ( 22 and 24) can be cleaned.

  When the flexographic ink remaining in the ink supply pipe (20) and the ink collection pipe (22, 24) is not only washed and removed, but also collected in a reusable manner, the amount of water added is determined by the water metering device (66A, 66B). , 66C), the water content to be added is adjusted with respect to the total amount of flexographic ink collected in the ink supply source (302) to allow the water content to be allowed for reuse of the flexographic ink. In this case, if the amount of water added is too large to determine the allowable amount of water added, the viscosity of the recovered ink will decrease, and the color tone when printed on a cardboard sheet will be adversely affected. It is preferable to determine the allowable amount of water added according to the ink viscosity by monitoring the viscosity change of the recovered ink with an ink viscometer (52) installed in the tube (20). The moisture metering device may be connected to the downstream side of the open / close valve (68A, 68B, 68C) to adjust the amount of added water, or the ink viscometer may be connected to the ink recovery pipe (22, 24). Also good.

  The flexo ink adhering to the surfaces of the ink transfer roll (12) and the ink squeezing doctor blade (404) is a slight amount of about 50 cc, for example. It is preferable to scrape and discard. At this time, the ink to be removed from the roll surface is not collected via the ink supply pipe (20) and the ink collection pipe (22, 24), but is collected and disposed of by an appropriate means, whereby the ink supply pipe (20) and the ink collection are collected. It is possible to prevent the flexo ink from adhering again in the tubes (22, 24).

(IV) Cleaning stage (I) Cleaning stage with watering pipe First, the rotation of the ink transfer roll (12) is stopped once, and the pressure of the doctor blade (404, 406) on the ink transfer roll (12) by the pressing means is released. Then, as shown by the arrow in FIG. 2, the cross bar (400) is swung from the first position to the second position around the lower pivot position (408). Next, the plunger is opened, the cross bar (400) is manually rotated, and the cleaning liquid scraping doctor blade (406) is moved in the circumferential direction of the ink squeezing doctor blade (404) as shown by the arrow in FIG. Rotate to angular position. Next, the cross bar (400) is swung from the second position to the first position around the lower pivot position (408), and the cleaning blade scraping doctor blade (406) is moved against the ink transfer roll (12) by the pressing means. And press. Next, the ink / cleaning liquid supply source switching device (300) is switched from the ink supply source (302) to the cleaning liquid recovery source (304), and the tip nozzles of the tubes (20, 22, 24) are inserted into the net (310). Wash with brush (310).

  Next, in a state in which most of the flexographic ink in the ink reservoir (16) is collected, the valve (152) is opened, while the valve (154) and the valve (113) are closed, and the spray nozzle of the water spray pipe (158). The flexographic ink adhering to the side surface of the ink transfer roll (12) is rotated by rotating the ink transfer roll (12) while jetting cleaning water from (160) toward the side peripheral surface of the ink transfer roll (12). Wash. The inner surfaces of the pair of dam members (36, 38) that form part of the ink reservoir (16) are cleaned by a separately provided cleaning device (not shown). You may wash | clean with the washing water from an injection nozzle (160). In this case, the spray nozzles (160) positioned at both ends of the roll corresponding to the positions of the inner surfaces of the pair of blocking members (36, 38) can be cleaned directly by spraying with cleaning water. A spray nozzle having a predetermined spray angle is preferable.

(B) Recovery stage of cleaning liquid by scraping blade Next, the pair of scraping blades (102A, 102B) at the axial end positions of the rolls are returned to the first axial position and moved to the upper standby position. The pair of scraping blades (102A, 102B) may be returned during cleaning by the spray nozzle (160). Next, as in the case of ink recovery, the washing water collected in the ink reservoir (16) is collected by the three pipes (20, 22, 24), and thereby the washing accumulated in the ink reservoir (16). Most of the water is collected, and then the pair of scraping blades (102A, 102B) is moved to the lower operating position and moved toward the corresponding shaft end, while moving from the inlet / outlet opening (204) to the internal flow path (210 ) Through the ink pipes (22, 24), the remaining cleaning liquid can be recovered to the cleaning liquid recovery source (304) with a high yield. Next, a state in which the pair of scraping blades (102A, 102B) is arranged at the upper standby position for each curved side surface of the pair of scraping blades (102A, 102B) and the surface opposite to the facing surface (103A, 103B). Then, the adhering ink is removed by a separate cleaning means to prepare for color change.

  While moving the pair of scraping blades (102A, 102B), it is not necessary to eject water from the cleaning liquid ejecting nozzle (105) unlike the above-described ink removing and collecting stage, but the ink color is changed immediately after. In the case of printing with new ink, water may be ejected. In this case, the inside of the infinite number of recesses on the side peripheral surface of the ink transfer roll (12) is moisturized, so that the familiarity of the ink after the color change becomes good and the occurrence of unnecessary printing immediately after the start of printing is prevented. It becomes possible to do.

(C) Recovery stage of cleaning liquid by air ejector Next, the on-off valves (82A, 82B, 82C) connected to the side passages (80A, 80B, 80C) of the on-off valves and the on-off valves (78A, 78B, 78C) respectively Open the high pressure air from the high pressure air source (72) to the air ejector (30A) connected to the ink supply pipe (20) and the air ejector (30B, 30C) connected to the ink recovery pipe (22, 24). Supply. By supplying high-pressure air as primary air to the air ejector, the ink supply pipe (20) and the ink recovery pipes (22, 24) from the ink reservoir (16) to the air ejectors (30A, 30B, 30C) are provided. By generating a high-speed air flow toward the cleaning liquid recovery source (304) inside, the cleaning liquid adhering to the inner walls of the ink supply pipe (20) and the ink recovery pipes (22, 24) is removed, and the cleaning liquid recovery source (304 ).

  This completes the reusable removal / recovery of the flexographic ink adhering to the ink supply / recovery tube. In particular, when changing the color of the ink, it is possible to prevent printing defects caused by the ink remaining in the recesses of the anilox roll and solidified.

  In preparation for color change of ink, as described above, first, the ink transfer roll (12), the doctor blades (404, 406), the inner surface of the cross bar (400), and the pair of the ink storage unit (16). Dam member (36, 38), secondly, ink supply pipe (20) and ink collection pipe (22, 24) constituting the ink supply and recovery system, and thirdly, in the ink reservoir (16). As shown in FIG. 9, each of the scraping blades (102) immersed in the ink is washed with ink used in the old order in the ink collecting stage or the washing stage. However, depending on the amount and color of the old order ink adhering to each component, or the amount and color of the ink used in the new order, as shown in FIG. You may wash | clean in a collection | recovery step or a washing | cleaning step.

More specifically, the side peripheral surface of the ink transfer roll (12) is mainly cleaned by direct jetting of cleaning water (water) from the water spray pipe (158), but in addition to or in place of the cleaning. In particular, it is possible to perform direct water jet from the jet nozzle (160) of the scraping blade (102) or indirect cleaning with the cleaning water accumulated in the ink reservoir (16).
The inner side surface constituting the ink reservoir (16) of the doctor blade (404, 406) is mainly washed indirectly by the cleaning water accumulated in the ink reservoir (16). In particular, direct ejection from the ejection nozzle (160) of the scraping blade (102) or indirect cleaning with cleaning water accumulated in the ink reservoir (16) is also possible.
For the inner surface of the crossbar (400), the direct cleaning from the spray nozzle (160) of the scraping blade (102) is the main cleaning, but in addition or alternatively, from the sprinkler pipe (158). Cleaning by direct jetting of cleaning water or indirect cleaning with cleaning water stored in the ink storage section (16) is also possible.
For the facing surface (103) of the scraping blade (102), direct cleaning from the spray nozzle (160) of the scraping blade (102) is the main cleaning, but in addition or alternatively, ink storage Indirect cleaning with cleaning water accumulated in the section (16) is also possible.

  As a modification, a squeeze roll that contacts the side peripheral surface of the ink transfer roll (12) is employed as a substitute for the ink squeeze doctor blade (404) and the cleaning liquid scraping doctor blade (406) as in the prior art. Also good. In this case, regarding the technical significance of the pair of scraping blades (102) including the cleaning liquid ejecting nozzle (105), the ink transfer is performed while the pair of scraping blades (102) are moving in the opposite directions in the axial direction of the roll. If the roll (12) and the squeeze roll are rotated in the direction toward the lower side of the ink storage part (16), the pair of scraping blades (102) may be caught below the ink storage part (16). This is different from the cases of the ink squeezing doctor blade (404) and the cleaning liquid scraping doctor blade (406) as described below.

That is, when the pair of scraping blades (102) are moved in opposite directions to each other in the axial direction of the roll during the ink removal and recovery process and the cleaning process, the ink transfer roll (12) is stopped without rotating. Therefore, as described in the present embodiment, it is difficult to simultaneously collect the ink remaining without being collected in the ink reservoir (16) and cleaning the ink attached to the ink transfer roll (12). Further, since the contact portion between the ink transfer roll (12) and the squeeze roll does not constitute a movable portion, the problem of wear hardly occurs, and water is ejected from the cleaning liquid nozzle (105) provided on the pair of scraping blades (102). Thus, the contact portion is moisturized by the water accumulated in the ink reservoir (16), and the significance of suppressing the progress of wear is not recognized.
However, as in the present embodiment, the pair of scraping blades (102) are moved in the roll axis direction, and water is ejected from the cleaning liquid ejecting nozzle (105), whereby the ink is stored in the ink storage section (16). The remaining ink or cleaning liquid can be efficiently recovered, and the pair of scraping blades (102) at the portion of the ink storage section (16) sandwiched between the pair of scraping blades (102). It is possible to prevent the ink from leaking out from the contact portions between the ink transfer roll (12) and the squeeze roll, and spreading the ink contamination range on the peripheral side surfaces of both rolls.

While the embodiments of the present invention have been described in detail above, various changes and modifications can be made by those skilled in the art without departing from the scope of the present invention.
For example, in the present embodiment, the ink storage unit (16) and the ink supply source (302) are described as being connected via three ink conduits. As long as the ink can be circulated, there are at least an ink supply line and an ink recovery line. When collecting ink, the ink supply line is used for collecting ink, while when supplying ink, the ink collection line is used for supplying ink. It may be used for

1 is a perspective view of a main part of a printing press according to an embodiment of the present invention. The schematic side view which shows the printing part of the printing machine of FIG. The figure which shows the main piping routes of the printing machine of FIG. The schematic side view around a pair of scraping blades of FIG. FIG. 2 is a schematic front view and a schematic side view of the ink blocking plate in FIG. 1. The schematic front view which shows a tubing pump. The schematic side view which shows a tubing pump. FIG. 3 is a perspective view of an ink / cleaning liquid supply source switching device. The table | surface which shows the washing | cleaning method of the structural member at the time of ink color change.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Printing machine 12 Ink transfer roll 14 Ink squeeze roll 16 Ink storage part 20 Ink supply pipe 22, 24 Ink collection pipe 26 Tubing pump 28 Water supply pipe 30 Air ejector 32, 34 Machine frame 36, 38 Ink blocking plate 40 Plate cylinder 42 Stamping Plate 52 Ink Viscometer 54 Opening and Closing Valve 56 Screw Shaft 58 Motor 64 Moisture Supply Source 68 Moisture Measuring Device 72 High Pressure Air Source 94 Rotor 98 Supporting Device 101 First Curved Side 102 Pair of Scraping Blades 105 Cleaning Liquid Injection Nozzle 110 Movement Mechanism 111 Cleaning liquid supply pipe 112 Machine frame 113 Open / close valve 158 Sprinkling pipe 160 Spray nozzle 202 Inner surface 204 Outflow / inflow opening 205 Upper surface 210 Internal flow path 214 First opening for connection 216 Second opening for connection 300 Ink / cleaning liquid supply source switching device 302 I Click source 304 cleaning liquid recovery source 306 bracket 308 doctor blade 408 downward pivot position for scraping doctor blade 406 cleaning liquid air cylinder 400 crossbar 402 inclined surface 404 ink aperture

Claims (7)

An ink transfer roll for transferring ink to a printing plate, an ink squeezing member that extends in the axial direction of the ink transfer roll, and adjusts the amount of ink transferred by contacting the ink transfer roll, and the ink transfer roll And an ink reservoir defined by the ink squeezing member so as to extend in the axial direction of the ink transfer roll, an ink conduit having one end opening facing the ink reservoir, and the ink reservoir, A scraping blade provided in contact with each side surface of the ink transfer roll and the ink squeezing member, and a blade moving mechanism for moving the scraping blade in the axial direction, and stored in the ink storage section; In a printing machine that performs printing using ink,
The ink conduit has two ink recovery conduits, one end opening of one of the two ink recovery conduits is at one end of the ink reservoir, and the other end opening is the ink. Provided at the other end of the reservoir,
Further, a pair of scraping blades provided in contact with the side surfaces of the ink transfer roll and the ink squeeze body in the ink storage unit,
A blade moving mechanism for moving the pair of scraping blades in opposite directions toward the one end opening corresponding to the axial direction;
A cleaning liquid spray nozzle attached to each of the surfaces facing the pair of scraping blades so as to spray the cleaning liquid toward the side edges of the facing surfaces.
A printing machine characterized by that.   The ink squeezing body is composed of a doctor blade arranged such that a leading edge thereof is in axial contact with a side peripheral surface of the ink transfer roll, and the ink transfer roll includes the pair of scraping blades, The printing press according to claim 1, wherein the printing press is rotated while being moved in directions opposite to each other in the axial direction.   The ink is made of flexographic ink, and the ink transfer roll is made of an anilox roll having a large number of concave portions over the entire side peripheral surface, and the anilox roll and the doctor are arranged so that the flexographic ink is accumulated in the ink reservoir. The printing press according to claim 2, further comprising a weir member provided at an end of each blade, and jetting water from the cleaning liquid jet nozzle. The ink conduit connects the ink reservoir and the ink supply source so that flexographic ink can circulate, and the ink conduit has one end for collecting each ink disposed at a corresponding end of the ink reservoir. Two ink collection pipes, and an ink supply pipe having an ink supply one end opening disposed between the ink collection one end openings and facing the ink reservoir,
Thereby, at the time of printing, by supplying flexo ink from the ink supply source to the ink reservoir through the ink supply tube, the flexographic ink is recovered from the ink reservoir to the ink supply source through the ink recovery tube. , Maintaining the flexo ink in the ink reservoir in a dynamic state,
The blade moving mechanism is configured such that the pair of scraping blades correspond to each of the pair of scraping blades from an ink collection preparation position where each of the pair of scraping blades is located in the vicinity of the one end opening for ink supply. The printing press according to claim 3, wherein the printing presses are moved in the opposite directions in the axial direction to an ink recovery end position located in the vicinity of the one end opening for ink recovery.   The printing machine according to claim 2, wherein the doctor blade is arranged to extend in a direction opposite to a rotation direction of the ink transfer roll.   The dam member has an internal flow path provided with a first outflow inlet at a lower portion of an inner surface facing the ink storage portion and a second outflow inlet at an upper surface of the dam member, and the internal flow path includes the ink The printing press according to claim 3, wherein one end opening for recovery communicates with the ink recovery pipe via the second outflow port. The doctor blade comprises a doctor blade for ink squeezing and a doctor blade for cleaning liquid scraping,
And a crossbar extending in parallel with the ink transfer roll,
The crossbar has at least two inclined surfaces extending in the axial direction on the side surface, the doctor blade for ink squeezing is attached to one inclined surface, and the doctor blade for scraping cleaning liquid is attached to the other inclined surface,
A first position where the ink squeezing doctor blade and the cleaning liquid scraping doctor blade are in contact with a side peripheral surface of the ink transfer roll; and the ink squeezing doctor blade and the cleaning liquid scraping doctor blade are the ink transfer roll. A crossbar rocking drive device for rocking the crossbar between a second position spaced from the side peripheral surface of the crossbar;
The printing machine according to claim 5, further comprising: a crossbar rotation driving device that rotates the crossbar around a longitudinal direction.

Images