JPS61163861A - Photogravure printing unit - Google Patents

Abstract

PURPOSE:To enable plate barrel replacement and plate barrel or ink device cleaning work to be performed easily and rapidly by providing a device to inject detergent to a plate barrel, a device to inject detergent to the inner surface of an ink pan, a means to supply detergent to a jet device and a plate barrel changing device. CONSTITUTION:The upper openings of a plate barrel 2 and an ink pan 6 are hermetically sealed, and detergent is injected to the plate barrel by the first jet device 39 for cleaning the plate barrel. Detergent is collected into a lower ink pan so that is does not evaporate flying into the surrounding. After cleaning the plate barrel, the ink pan is moved downward to create space below the plate barrel so that the operation of a plate barrel changing device 10 may not become faulty. After carrying the plate barrel out a printing unit, the ink pan is again tightly sealed and detergent is injected by the second jet device 41 to clean the ink pan. Consequently, it is made possible to arrange the jet device for cleaning the ink pan at a suitable position for cleaning the ink pan and clean every corner of the ink pan sufficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a printing unit for a gravure printing press, and more particularly to a printing unit that facilitates cleaning of the plate cylinder and inking device and facilitates plate cylinder replacement.

In gravure printing, especially in the field of special printing where films and other materials are printed, when changing ink colors or replacing plate cylinders, whether in multi-color printing or single-color printing, the ink adhering to the first plate cylinder must be washed off, and the ink pan and its ink must be washed off. It is necessary to clean the inking system, which includes the circulation system. These days.

Gravure printing tends to have a wide variety of products and small lofts, and the frequency of replacing the single plate cylinder and cleaning the plate cylinder and ink device has become extremely high.

Conventionally, the replacement of the first plate cylinder has been carried out by holding the plate cylinder by hand or by using a transport cart equipped with a support base that can be raised and lowered. Immediately after printing, the plate cylinder is cleaned by rotating the plate cylinder at a low speed and dripping a cleaning solvent from above through a jaw or the like to wet the two plate surfaces and wiping it off with a rag or the like.

Furthermore, in order to clean the inking device, the ink pan and related piping are first removed from the printing press, transported to a cleaning location, and then carried out manually or by using a cleaning device.

The problem that the invention seeks to solve However, this method has various problems as follows.

fil Manually cleaning the plate cylinders of each unit is not only labor intensive but also takes an hour. Moreover, one worker inhales the vapor of the cleaning solvent during one operation, which is unfavorable from a sanitary standpoint.

(2) The manual method of replacing plate cylinders is extremely labor-intensive. In addition, the method of using a transport trolley equipped with a support stand that can be raised and lowered requires the transport trolley to be placed below the 9th edition cylinder.
Therefore, the inking device such as an ink pan located below the plate cylinder must be removed each time the plate cylinder is replaced, which is a laborious and time-consuming task.

(3) The work of removing the ink pans, ink piping, etc. of each unit from the printing press and transporting them to the washing area is a laborious and time-consuming task for the nine workers.

(4) Cleaning at the cleaning site is often done manually using solvents, which requires triple labor and time, and poses many problems in terms of environmental hygiene.

(5) Especially when transporting to the washing place, dirty ink dries and cleaning performance becomes very poor.
Cleaning work is hard work. Even if a cleaning device is used, ink stains cannot be completely removed and manual work is required.

(6) In addition, since more solvent than necessary is used, the solvent cost is also high.

(7) There have been attempts to improve cleaning efficiency by coating the dirty surface of the ink pan with a material that has good mold release properties, but in order to remove heavy dirt, physical scratching with a spatula-like object is necessary. It was often dropped, and the release surface was damaged, so the effect could not be expected.

As described above, the preparation work associated with changing the printing conditions is hard labor and time-consuming work, and in order to solve the problem of increasing productivity, it is important to simplify the preparation work and shorten the time by 9 hours.

The present invention has been made in view of the current situation, and an object of the present invention is to provide a gravure printing unit that mechanizes the cleaning work of the first plate cylinder and the second plate cylinder and the inking device, and that can be performed easily and quickly.

Means for Solving the Problems The present invention, which has been made to achieve the above objects, provides a printing unit of a gravure printing press, which includes a shaftless plate cylinder supported by plate cylinder support shafts protruding from unit frames on both sides, and an upper plate cylinder. an ink pan that is movable between an operating position and a lower standby position; an ink pan sealing device that surrounds and seals an upper surface opening of the ink pan located in the second operating position and a plate cylinder above the ink pan; a first injection device for injecting a cleaning liquid onto the inner surface of the ink pan, a second injection device for injecting the cleaning liquid onto the inner surface of the ink pan, a cleaning liquid supply means for supplying the cleaning liquid to the first injection device and the second injection device, and a circumferential surface of the fifth plate cylinder. The gravure printing unit is characterized by having a plate cylinder exchange device that supports and conveys the plate cylinders into and out of the printing unit.

Operation In the apparatus of the present invention, cleaning of the first plate cylinder and the inking device is carried out as follows. First, the plate cylinder is cleaned by injecting a cleaning liquid onto the plate cylinder using a first injection device while the top opening of the plate cylinder and ink pan are sealed. The cleaning liquid sprayed at this time is collected in the lower ink pan, evaporates, and
It will not be scattered around. Next, after the plate cylinder is cleaned, the ink pan is moved downward to create a space below the plate cylinder so that the operation of the plate cylinder changing device is not hindered. In this state, a plate cylinder support is placed below the plate cylinder to support the peripheral surface of the plate cylinder.

Thereafter, the ink pan is sealed again, and the second spray device sprays the cleaning liquid to clean the ink pan. At this time, since there is no plate cylinder above the ink pan, the injection device for cleaning the ink pan can be placed at a position suitable for cleaning the ink pan, and every corner of the ink pan can be cleaned well. Further, by circulating the cleaning liquid used at this time through the ink circulation system, cleaning can be performed on the spot without also removing the ink circulation system. After cleaning is completed, the ink pan is lowered again to create an operating space for the second plate cylinder exchange device, and the new plate cylinder outside is fed into the printing unit and the first plate cylinder is attached.

Example A preferred embodiment of the present invention shown in one drawing will be described below.

FIG. 1 is a side sectional view showing the printing unit of the present invention during printing, and FIG. 2 is a side sectional view showing the state in which the plate cylinder is removed and the ink pan is sealed and cleaned after printing is completed.

Figure 3 is its front sectional view, Figure 4 is its horizontal sectional view,
FIG. 5 is a schematic perspective view of the printing unit gear side with the plate cylinder removed and the ink pan sealing device opened. In the figure, 1 is a unit frame, 2 is a plate cylinder, 3 is a plate cylinder support shaft, 4 is an impression cylinder, and 5 is a furnisher roller.

Reference numeral 6 designates an ink pan, 7 an ink circulation system integrally fixed to the paper discharge side side surface of the ink pan 6, 8 a lifting platform that lifts and lowers the ink pan 6 on it, 9 a doctor, and 10 a plate cylinder changing device.

The unit frames 1 on both sides are provided with projecting portions 11 facing each other. This overhang portion 11 is
On its outer periphery, there is a lower sealing surface 11A that contacts the upper surface of the end of the ink pan 6 to exert a sealing effect, an upper sealing surface 11B that is curved in a convex shape, and a side that extends almost perpendicularly upward from one end of the lower sealing surface lIA. It has a sealing surface 11C. Near the lower end of the upper sealing surface 11B, that is, near the upper edge of the side of the ink pan on the paper discharge side of the printing unit, a stay 12 and a flexible sheet winding tool 13 are provided so as to extend over the overhangs 11 on both sides. Placed. The lower surface of the stay 12 forms a sealing surface for tightly sealing with the upper edge of the ink pan 6. As shown in an enlarged view in FIG. 6, the flexible sheet S attachment 13 is attached to an arm 16. Arm 1
Support rod 17 held at 6. The winding core 1'92 is supported by the support rod 17 via a spring 18, and the flexible sheet 20 is wound around the winding core 19 in the form of a roll. The spring 18 constantly biases the winding core 19 in the sheet winding direction.

Therefore, by pulling the leading edge of the sheet 20, the sheet 2o can be pulled out from the winding core 19, but when the leading edge of the sheet is released, the sheet 20 is automatically pulled out from the winding core 19.
It will be wound up.

The upper end of the vertical portion of the stay 12 is located at a height that matches the upper sealing surface 11B of the overhanging portion.

The sheet 20 is pulled out from this vertical portion side.

The sheet 20 has a width that can contact the upper sealing surfaces 11B of the overhanging portions on both sides, as can be clearly seen from the fourth figure. play a role. A rod 22 longer than the width of the sheet 20 is connected to the tip of the sheet 2o.

The rod 22 is movable along the upper sealing surface 11B.A wire 23 is connected to both ends of the rod 22.
This wire passes over the upper sealing surface 11B of the overhanging portion 11, and is wound via a pulley 25 onto a pulley 27 provided on a shaft 26 extending between the unit frames on both sides. The shaft 26 is a reversible rotary motor 2 with a brake.
．． It is connected to 8. These motors 28, pulleys 27. For the wire 23, etc., connect the rod 22 to the upper sealing surface 11B.
A drive mechanism is configured to move the vehicle along the Thus, when the motor 28 winds the wire 23 around the pulley 27,
The rod 22 slides on the upper sealing surface 11B and moves toward the doctor 9, pulls out the flexible sheet 2o, and covers the upper part of the ink pan with the sheet 20. Also, when the motor 28 is rotated in the reverse direction and the wire 23 is fed out. , flexible sea 1-
20 is wound onto the winding core 19, and the upper part of the ink pan is opened. Furthermore, when the tip of the sheet 20 is restrained, tension is applied to the sheet 2o by the winding force of the spring 8, and the sheet 20 is pressed against the upper sealing surface and sealed. 20 firmly against the upper edge of the stay 2 to seal this part. Note that not only the flexible sheet 20 is sealed with the upper sealing surface 11B and the stay 12, but also the sheet 20 can be pressed and sealed against the upper sealing surface and the stay with a frame having a shape corresponding to the upper sealing surface and the stay. Good too.

The doctor 9 is fixed to the doctor holder 30,
The doctor holder 30 has a shaft 33 held by a hanging arm 32.
installed on. This doctor holder 30 is the first
It is movable between the doctor operating position shown in the figure and the raised position shown in FIG. Furthermore, the doctor holder 30 has an arcuate outer peripheral surface 30A and a flat surface 30B at the tip, and the flat surface 30B touches the upper sealing surface 11B when the doctor 9 is raised and made almost horizontal as shown in FIG. The height is approximately the same as that of the upper sealing surface 11B so that the baffle 22 moving along the surface bumps against it. A sealing plate 35 is provided below the doctor holder 30. This sealing plate 35 is attached to a support (not shown) that is rotatable around the shaft 33, and is rotatable while its upper end contacts and seals the outer peripheral surface 30A of the doctor holder 30. The sealing plate 35 is the second
As shown in the figure, when the doctor holder 30 is in the raised position, it has a size that allows it to come into contact with the side sealing surfaces 11C of the overhanging portion 11 on both sides and the stay 37 extending over the lower end thereof,
In addition, the doctor hanging arm 32 is crimped onto these.
It is connected to an air cylinder 38 installed at Thus.

The sealing plate 35 opens and closes a region sandwiched between the side seal surfaces 11G on both sides. The stay 37, which extends over the lower ends of the side sealing surfaces of the projecting portions 11 on both sides, has a sealing surface that comes into close contact with the sealing plate 35, and also has a sealing surface that comes into close contact with the upper edge of the ink pan. Overhang part 11 explained above
．． Flexible sheet winding tool 13. The doctor holder 30, the sealing plate 35, and the like constitute an ink pan sealing device that surrounds the plate cylinder 2 and covers the upper opening of the ink pan. In the above embodiment, the sealing plate 35 was suspended from the doctor holder 30, but instead, the doctor holder was moved further upwards than the position shown in FIG. It may be held by a holding mechanism such that the side sealing surface and stay 37 are pressed for sealing.

A first injection device for cleaning the plate cylinder, which is composed of a number of nozzles 39, is attached to the sealing plate 35. As shown in Fig. 1, this injection nozzle 39 is hidden below the upper edge of the ink pan 6 during normal printing, but when raised to the position shown in Fig. 2, it is placed in a position where it can inject cleaning liquid onto the plate cylinder. . Nozzle 3
As can be clearly seen from Fig. 3, nozzles 9 are arranged in a straight line along the first plate cylinder 2, and the nozzles at both ends of 5 are used for cleaning the plate cylinder support shaft 3, and the other nozzles are used for cleaning the plate cylinder. Ru. As the nozzle 39, any commercially available one can be used as appropriate, but the nozzle for cleaning the plate cylinder support shaft 3, which is heavily contaminated, should be of a large flow rate type that sprays the cleaning liquid in a conical shape.

Further, the nozzle for cleaning the plate cylinder is preferably of a small flow rate type that sprays the cleaning liquid in a flat fan shape. In addition, the nozzle 39
The mounting position can be changed as appropriate.1 For example, it is located at an appropriate position on the arcuate outer peripheral surface of the doctor holder 30, that is, when the doctor is used as shown in FIG. 1, it is located outside the sealing plate 35.
When the doctor holder is rotated to the position shown in Fig. 2, it may be built in so that it faces the plate cylinder.
A pipe or rod parallel to the plate cylinder 2 with many nozzles attached to it is retracted into the overhang, and the plate cylinder 2 is removed during cleaning.
It may also be used by sending it out to a position facing the.

The mutually facing end surfaces of the overhanging portions H on both sides have a thickness of 4.
0 is formed in the recess 4o, and a second injection device 41 for cleaning the ink pan is accommodated in the recess 4o, as shown by the two-dot chain line in FIG. The injection device 41 is held in a support tube 42 extending through the wall of the overhang 11.
2 includes a mechanism 1 for moving the support tube 42 in its axial direction;
For example, an air cylinder or the like is connected. Thus, the injection device 41 is movable between a standby position within the recess 4o and an ink pan cleaning position shown in solid lines in FIG. 3 and FIG. 4.

Note that the injection device 41 does not necessarily have an overhanging portion 11.
It is not necessary to provide a recess 4o and store it inside the recess, as long as it can be evacuated to a position that does not hinder printing,
It is preferable to store it inside the printer because it prevents ink stains during printing. The spray device 41 sprays the cleaning liquid onto almost the entire inner surface of the ink pan 6 and the ink pan sealing device, as shown in FIG.

A nozzle assembly in which a large number of nozzles 44 are embedded in the surface of a polyhedral block 43 is suitable. The support tube 42 supports the spray device 41 and also serves to supply cleaning liquid to each nozzle. Note that the injection device 41 may be one in which the illustrated nozzle is embedded, or a nozzle of a type that rotates on its own axis due to the injection pressure of the liquid.

In Figures 2 and 3, the inking device that supplies ink to the first plate cylinder 2 consists of an ink pan 6 and an ink circulation system 7 attached to the side of the ink pan 6, and the ink tank is not used. This is to reduce the amount of water and to make cleaning of the ink circulation system 7 easier. The ink pan 6 consists of side plates 50 at both ends and a body plate 51 between the line side plates 50, and the body plate 51 has a smoothly curved bottom as can be clearly seen in FIG. Further, as can be clearly seen from FIG. 3, both ends of the body plate 51 are fixed to the side plates 50 in a smoothly curved state, and are inclined toward the center. This structure facilitates cleaning of the inner surface of the ink pan 6 and allows the liquid inside to always flow toward the deepest part in the center.

The inside of the ink pan is coated with Teflon to improve cleaning performance.

A connecting pipe 53 is provided at the deepest part of the ink pan 6, and the connecting pipe 53 is connected to an inlet pipe 5 of the ink circulation system 7.
4 is fixed. The ink circulation system 7 includes a connecting device 55° and an ink pump 56. Connector 57. Filter 58. Valve 59, bypass 60. It has a bypass valve 61 etc.

The outlet piping 62 is fixed to the upper part of the ink pan 6, and the ink circulation system 7 is integrated with the ink pan 6. Note that the pipe 6 is connected to the connection part of the pipe 62 of the ink pan 6.
Suitable means (not shown) are provided for supplying the ink discharged from 2 into the ink pan to the furnisher roller 5. A drain pipe 65 equipped with a drain valve 64 is connected to the lower connector 55 . As the ink pump 56, an air-driven diaphragm pump equipped with a check valve is suitable. The bypass 6o is for removing ink remaining in the piping above the pump when a diaphragm pump is used, and the bypass valve 61 is closed during operation. If a pump is used that allows ink to flow downward through the pump from above when the pump is stopped, the bypass 6o is not necessary.

As the filter 58, a magnetic filter having a built-in magnet is suitable so that metal powder mixed in the ink can be reliably removed.

A circular hole is formed in the side plate 50, and a disk 67 is rotatably held in the hole via a sealing material and a bearing.

This disc 67 is attached so that it is almost flush with the inner surface of the side plate 5o, and the nine disc 67 that facilitates cleaning of the side surface of the ink pan is located at an eccentric position away from the center of rotation.
The shaft 5A of the furniture roller 5 is rotatably held via a sealing material and a bearing. A pulley 68 is fixed to the end of one shaft 5A of the furniture social roller 5, and this pulley 68 is drivingly connected to a pulley 70 of an intermediate shaft 69 held at the center of the disc 67. The intermediate shaft 69 further holds a pulley 71, which is drivingly connected to a drive motor (not shown). As a result, no matter which position the first disc 67 rotates, the furniture social roller 5 can be rotated by a drive motor (not shown). Furthermore.

An air cylinder 7 shown in FIG. 8 is installed outside the ink pan 6.
2. Lever 73. Loft 74. A pin 75 is provided which connects the rod 74 to the disc 67 and forms a means for rotating the disc 67.

The side plate 50 of the ink pan 6 is fixed to a support stand 77, and casters 78 are attached to the support stand 77 to facilitate movement. The ink pan 6 is mounted at a predetermined position on the lifting table 8 of the printing unit.

FIG. 9 is a piping diagram showing the means for supplying cleaning liquid to the nozzle 39 for cleaning the plate cylinder and the injection device 41 for cleaning the ink pan. A filter 80 is installed in the nozzle 39 and the injection device 41.
．． It is connected to a cleaning liquid supply means having a cleaning liquid supply pump 81 and the like. The suction side of the pump 81 is connected to a new cleaning liquid supply source, and is also connected to the connecting pipe 53 at the bottom of the ink pan 6 via a pipe 82. Piping 82 is further connected to an exhaust blower (not shown). On the other hand, pump 8
The discharge side of No. 1 is connected to a waste cleaning liquid reservoir via a branch pipe 83. Furthermore, a carbon dioxide gas supply source is connected to the discharge side piping of the pump 83 via a piping 84 . The pump 81 used here includes the nozzle 39. A gear pump is preferable so that the pressure and discharge amount necessary for injection by the injection device 41 can be secured.

As shown in FIG. 10, the plate cylinder changing device 10 includes a rotating arm 92. It has a plate cylinder support 93 etc. rotatably held at its tip. The drive shaft 91 is rotatably driven by a rotary drive device (not shown), and pivots the supported swing arm 92. The plate cylinder support 93 is designed to support the peripheral surfaces of plate cylinders of various diameters.
It forms a seven-figure shape. In addition, the V-shaped inner surface (top surface)
instead of supporting the plate cylinder directly.

As shown in FIG. 11, the ninth plate cylinder support 93 may be provided with a freely rotating ball 94, or as shown in FIG. 12, a rotatable roller 95 may be provided. Such balls 94 and rollers 9
5, the first plate cylinder 2 can be rotated easily, and when the plate cylinder support shaft 3 is inserted into the first plate cylinder 2, the phase alignment between the two can be facilitated.

The plate cylinder support 93 has an axle 96 fixed thereto.

The shaft 96 is rotatably held in the pivot arm 92.

A pulley 97 is fixed to the tip of this shaft 96, and is connected by a belt 99 to a pulley 98 rotatably held by the drive shaft 91. The pulley 98 is fixed to the unit frame 1 by suitable means and does not rotate regardless of the rotation of the drive shaft 91. As a result, the drive shaft 9
Even if the swing arm 92 pivots due to the rotation of the plate cylinder 2, the plate cylinder support 93 at its tip does not rotate and remains in a constant direction, that is, in a horizontal state with the surface holding the plate cylinder facing upward. Always keep it in good condition. These pulleys 97.98. The belt 99 constitutes a leveling mechanism that maintains the plate cylinder support horizontally regardless of rotation of the pivot arm. Note that the leveling mechanism is not limited to the one using the illustrated pulley and belt, but may use other means 1, such as one using a link.

Near the printing unit, a rail 102 for running the plate cylinder carrier 101 is provided, and a stopper (not shown) for positioning the plate cylinder carrier 101 at a predetermined position is provided. The transport truck 101 has a plate cylinder support stand 103 that supports approximately the center of the plate cylinder, and the length of this support stand 103 is determined to be smaller than the interval between the pair of plate cylinder supports 93. The mounting position of the drive shaft 91 of the plate cylinder exchange device 10 is such that the plate cylinder supported by the first plate cylinder support 93 comes to the plate cylinder chucking position and the plate cylinder support stand 103 position of the transport cart by the rotation of the swing arm 92. determined. The mounting position of the drive shaft 91 is when the center of the plate cylinder on the 9th plate cylinder support 93 is aligned with the center of the plate cylinder support shaft 3.

Preferably, the pivot arm 92 is selected to be substantially horizontal. With this selection, when plate cylinders of various diameters are placed on the first plate cylinder support 93 and the swing arm is rotated to align the center of the plate cylinders with the same height as the center of the plate cylinder support shaft, the horizontal deviation will be can be made smaller.

Note that the plate cylinder exchange device 1o of the above embodiment has a first plate cylinder support 9.
3 is held at a predetermined position on the swing arm 92, but the second plate cylinder support is held by an auxiliary arm that can swing with respect to the swing arm, or it is held slidably with respect to the swing arm. Good too. In this way, 1
Since the plate cylinder support 93 can be moved relative to the rotating arm, the plate cylinder support 93 can be moved to any position (especially to a different position in the horizontal direction) in combination with the rotation of the rotating arm.
It can be moved, and the center of the plate cylinder held on the first plate cylinder support can be accurately positioned at the center of the plate cylinder support shaft 3, and the first plate cylinder can be lowered to different positions on the transport cart. benefits.

Next, the operation of the above device will be explained. Note that the following operations are performed automatically by a control device (not shown) or by push button operation, but since this control device itself can be easily designed by a person skilled in the art, a description thereof will be omitted.

During normal printing, the ink pan 6 is in the raised position as shown in FIG. 1, and its upper edge is pressed and sealed against the lower seal surfaces 11A of the projecting portions 11 on both sides and the lower surfaces of the stays 12, 37. Injection device 41 for ink pan cleaning
is housed in the recess 40 of the overhanging portion 11. Most of the flexible sheet 20 is wound up by the flexible sheet winding tool 13, and the rod 22 attached to the tip is located near the flexible sheet winding tool 13. In this state, since there is no flexible sheet above the ink pan 6 and the ink pan 5 is wide open, there is no problem in pressing the impression cylinder against the plate cylinder 2 or passing the paper to be printed. If necessary, the wire 23 is wound around the pulley 27 by the motor 28, and the rod 22 is pulled out to a position where it does not interfere with the running paper.

The upper part of the ink pan 6 is partially covered with a flexible sheet 20.

It may also be possible to limit the scattering of ink stains to the surroundings and the evaporation of solvents. On the other hand, the sealing plate 35 below the doctor holder 30 is pressed against the stay 37 pressing against the upper edge of the ink pan, and prevents the ink scraped by the doctor 9 from scattering to the outside. Further, at this time, the nozzle 39 is located below the sealing position between the stay 37 and the sealing plate 35, so that it is not contaminated by ink scraped off by the doctor 9 or ink scattered from the plate cylinder.

After printing is completed, the impression cylinder 4 is first moved upward, and secondly, the sealing plate 35 below the doctor holder 30 is opened once, and the doctor holder 30 is raised to the position shown in Fig. 2, and the doctor 9 becomes almost horizontal. 3. Then rotate the sealing plate 35
the side sealing surface 11C of the overhanging portion 11 and the stay 37.
6. Next, the motor 28 shown in FIG. 5 is activated to wind the wire 23 around the pulley 27, and the wire 22 attached to the tip of the flexible sheet 20 is pressed against the top of the ink pan to seal the upper side of the ink pan. 11B. The rod 22 is the flat surface 30B at the tip of the doctor holder 30.
When the rod 221 hits and stops, the motor 28 is stopped and the brake is applied, and the rod 221 remains in contact with the flat surface 30B at all times and is sealed. on the other hand,
Since the flexible sheet 20 covering the upper surface of the ink pan 6 is applied with tension by the spring 18 of the flexible sheet winding device I3, the flexible sheet 20 is pressed and sealed against the convex upper sealing surface 11B by its own tension. In addition, in FIG. 6, the tension acting on the flexible seal 20 is caused by the arm 16 holding the winding core.
is swung clockwise to press and seal the flexible sheet 20 against the upper end of the stay 12.

Thus, above the ink pan 6 is the flexible sheet 20. Doctor holder 30. The plate cylinder 2 is surrounded and sealed by a sealing plate 35, etc., and preparations for cleaning the first plate cylinder are made.

Next, the plate cylinder cleaning procedure will be explained with reference to FIG. After the ink pan is sealed, residual ink is first drained from the drain pipe 65 at the bottom of the ink pan 6. Next, carbon dioxide gas is supplied from the pipe 84 and injected into the ink pan 6 through the nozzle 39.
Reduce the oxygen concentration in the ink pan. this is.

This is to avoid the risk of explosion when a cleaning liquid such as a solvent is injected into the ink pan. After carbon dioxide gas is injected, while slowly rotating the third plate cylinder, fresh cleaning liquid is supplied to the nozzle 39 by the pump 81, and is sprayed from the nozzle 39 onto the plate cylinder to clean the first plate cylinder. After continuing cleaning with new cleaning solution.

The supply of new cleaning liquid is stopped, and the cleaning liquid accumulated in the ink pan 6 is supplied to the nozzle 39 by the pump 81 to continue cleaning the first plate cylinder. Thereafter, the cleaning liquid in the ink pan is discharged out of the system as waste cleaning liquid, and the plate cylinder is cleaned again using new cleaning liquid. After repeating this operation appropriately, the cleaning liquid in the ink pan is discharged as waste cleaning liquid, and cleaning of the plate cylinder by nozzle jetting is completed. After cleaning the plate cylinder, the inside of the ink pan 6 is connected to the piping 82.
to exhaust the solvent vapor in the ink pan.

Thereafter, the ink pan 6 is lowered by the lifting platform 8 to a position where the operation of the plate cylinder changing device 10 is not hindered.

Next, as shown in FIG. 13A, the swing arm 92 is rotated to position the plate cylinder support 93 at the tip under the plate cylinder 2, and in this state, the plate cylinder is unchucked to move the plate cylinder to the plate cylinder support. Posted on 93. Next, the pivoting arm 92 is pivoted as shown in FIG.
It is carried out to a higher position than the plate cylinder support stand 103 of No. 01. Next, as shown in FIG. 13C, the plate cylinder transport cart 101 is positioned below the plate cylinder, and the 7th plate cylinder 2 is transferred to the transport cart 101 by pivoting the swing arm 92 downward. This completes the removal of the used plate cylinder.

Next, the ink pan 6 is raised again and pressed against the lower surface of the projecting portion 11 and the stays 12, 37, and the ink pan 6 is sealed in the state shown in FIG. After sealing and exhausting through the piping 82, the injection device 4
1 is moved to the operating position shown in FIGS. 3 and 4, fresh cleaning liquid is sent from the pump 81, and the cleaning liquid is sprayed onto the inner surface of the ink pan 6 and the ink pan sealing device to clean it. After cleaning to a sufficient extent, the supply of new cleaning liquid is stopped and cleaning is continued using the cleaning liquid in the ink pan. At this time, the ink pump 56 of the ink circulation system 7 is operated to pass the cleaning liquid into the ink circulation system 7, thereby cleaning the ink circulation system 7 in parallel. When the cleaning liquid becomes dirty, cleaning is temporarily stopped, the cleaning liquid is discharged as waste cleaning liquid, and then cleaning with new cleaning liquid is started. Thereafter, by repeating the same cleaning process, the ink pan, its sealing device, and ink circulation system are cleaned. After cleaning is complete, evacuate the ink pan again and thoroughly discharge the solvent vapor.

Lower the ink pan 6 and prepare for mounting the new plate onto the cylinder.

To install the new version cylinder, first, as shown in Figure 13D, install the first version cylinder 2.
The transport cart 101 carrying the is positioned at a predetermined position.

Ru. Next, the transport cart is pulled out from below the scooped-up plate cylinder, and the swing arm 92 is turned as shown in FIG. 13E.
The plate cylinder 2 held at the tip is brought to a chucking position and stopped at that position. Thereafter, the second plate cylinder support shaft 3 is advanced and its tip is inserted into a hole in the side of the plate cylinder 2 to hold the plate cylinder 2. At this time, even if there is some deviation between the center of the 1st plate cylinder and the center of the plate cylinder support shaft, there is no problem because the tip of the 9th plate cylinder support shaft is tapered. If it is necessary to match the phase with the cylinder support shaft 3, the phase is adjusted by rotating the plate cylinder manually on the support 93 or by rotating the plate cylinder support shaft 3.

After holding the plate UA2 on the plate cylinder support shaft 3, the rotating arm 9
2 to the position shown in Fig. 13F to complete the installation of the 1st plate cylinder.

This completes the printing cylinder, inking device cleaning, and printing cylinder replacement work after printing is completed.

In addition, although the above embodiment is an application of the present invention to a printing unit using a fan print roller for ink supply, the present invention is not limited to this method, and may be applied to other ink supply methods, such as a cascade method. It is also applicable to other printing units. Furthermore, even when using a fan inosha roller, the holding mechanism for the fan inosha roller is not limited to what is shown in the drawings, and can be modified as appropriate. However, as shown in the second embodiment, a mechanism that holds a disc rotatably attached to the side of the ink pan at an eccentric position can easily accommodate changes in the diameter of the plate cylinder, prevent ink from scattering, and is easy to clean. This is preferable because it has advantages such as being easy to use.

Effects of the Invention As described above, according to the present invention, the first plate cylinder and the inking device (ink pan and ink circulation system) can be quickly and efficiently cleaned on the spot without removing them from the printing unit. For this reason, there is no need to manually clean the plate cylinders individually, remove the ink pan and ink circulation system from each unit, transport them to the cleaning location, and clean them as in the past, and each unit can be cleaned at the same time. This makes it possible to clean the plate cylinder and inking device in an extremely short time. In addition, the operator does not directly handle the solvent used as the cleaning liquid during cleaning, which is more hygienic, and there is less chance of contamination of the blade platform with the vapor of the molten m1.

Also, to replace the 1st plate cylinder, simply lower the ink pan.

Since this is possible using a plate cylinder changing device, there is no need to remove the ink pan as in the past (it can be done quickly and easily).Thus, the present invention not only makes the working environment cleaner, but also greatly shortens the printing preparation period. It has an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view showing the printing unit according to the present invention during printing, FIG.
The figure is a front sectional view, FIG. 4 is a horizontal sectional view, FIG. 5 is a schematic perspective view of the printing unit gear side with the plate cylinder removed and the ink pan sealing device opened, and FIG. 6 is a flexible sheet winding 7 is a side view of the cleaning liquid injection device 41, FIG. 8 is a schematic diagram showing the drive mechanism of the disc 67 holding the furnisher roller, and FIG. 9 is a cleaning liquid supply means used in the device of the present invention. Fig. 1O is a perspective view of the plate cylinder exchange device, Figs. 11 and 12 are perspective views of a modified example of the plate cylinder support of the plate cylinder exchange device, and Figs. 13A to 13F are plate cylinder exchange devices. It is an explanatory view of plate cylinder exchange operation by a cylinder exchange device. 1 - Unit frame 2 - Plate cylinder 6 - Ink handle Two ink 5H1t system 11
- Overhanging part 11 A - Lower sealing surface 11B -
Upper sealing surface 11 (, - Side sealing surface 13 - Flexible sheet winding tool 20 - Flexible sheet 30 - Doctor holder 35 - Sealing plate 39 - Nozzle (first injection device) 41 - -Second injection device 43--Polyhedral block 44--Nozzle Patent applicant Dai Nippon Printing Co., Ltd. Agent Patent attorney Kyo Matsu Figure 12

Claims (6)

[Claims] (1) In the printing unit of a gravure printing press, there is a shaftless plate cylinder supported by plate cylinder support shafts protruding from unit frames on both sides, and an ink pan that is movable between an upper operating position and a lower standby position. an ink pan sealing device that surrounds and seals the top opening of the ink pan located in the operating position and the plate cylinder above the ink pan; a first injection device that injects a cleaning liquid onto the plate cylinder; and an ink pan sealing device that injects a cleaning liquid onto the inner surface of the ink pan. It has a second injection device that injects the liquid, a cleaning liquid supply means that supplies cleaning liquid to the first injection device and the second injection device, and a plate cylinder exchange device that supports the peripheral surface of the plate cylinder and conveys it into and out of the printing unit. A gravure printing unit characterized by: (2) The ink pan sealing device is a protruding portion provided on unit frames on both sides of the printing unit so as to face each other, and has a lower sealing surface on the outer periphery that contacts the upper surface of the end portion of the ink pan in a sealing relationship; an overhang having a side sealing surface extending substantially perpendicularly upward from one end of the lower sealing surface, and an upper sealing surface extending from an upper end of the side sealing surface to the other end of the lower sealing surface; an openable and closable flexible sheet that contacts the upper sealing surface in a sealing relationship and covers an area sandwiched between the upper sealing surfaces; and a flexible sheet that is disposed below the doctor holder of the printing unit in contact with the lower surface of the doctor holder, and Claim 1, further comprising an openable and closable sealing plate that contacts the side sealing surfaces of the projecting portions on both sides in a sealing relationship and covers the area sandwiched between the side sealing surfaces. gravure printing unit. (3) The gravure printing unit according to claim 2, wherein the flexible sheet is wound into a roll by a flexible sheet winding tool disposed near the upper surface of a side portion of the ink pan. (4) The gravure printing unit according to claim 2 or 3, wherein the first injection device is composed of a plurality of injection nozzles attached to the sealing plate. (5) The second injection device is composed of a nozzle assembly in which a large number of injection nozzles are embedded in a polyhedral block, and the nozzle assembly is arranged at a standby position in a recess formed on the end surface of the overhang and above the ink pan. The gravure printing unit according to any one of claims 1 to 4, wherein the gravure printing unit is provided movably between an operating position and an operating position. (6) The plate cylinder exchange device includes a rotating arm that can pivot about an axis parallel to the central axis of the plate cylinder support shaft, and a plate cylinder support that is held by the rotating arm and supports the circumferential surface of the plate cylinder. and a horizontal maintenance mechanism that maintains the plate cylinder support horizontally regardless of rotation of the rotating arm. printing unit.