JPH07266535A - Gravure printing press - Google Patents

Abstract

PURPOSE:To obtain a gravure printing press wherein reproducibility of printing is uniform and excellent, and exhange of a plate cylinder and its regulation in printing pressure are easily carried out. CONSTITUTION:A plurality of plate cylinder supporting devices wherein a height of a plate cylinder 32 can be adjusted are provided to a lower part of a printing unit. A pair of left and right connected slide plates 40 are in a slidable manner provided in a flow direction of a sheet material to an upper part of the printing unit i.e., above a support device of the plate cylinder. A plate cylinder 42, a backup roll 41, a skew roll 68, a runner roll 19, and a doctor unit 70 are supported with the slide plates 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to, for example, web, paper,
The present invention relates to a gravure printing apparatus that performs gravure printing on a film- or sheet-shaped printing substrate, and more particularly, to a gravure printing apparatus that can set and replace a plate cylinder in a short time.

[0002]

2. Description of the Related Art Conventionally, as an example of a gravure printing apparatus, a roll paper to be printed is rotatably supported, and while the roll paper is rotated, the paper is fed out to correct the curl of the paper and then, for example, yellow or the like is used. After passing the ink between the plate cylinder and the impression cylinder to transfer the ink to the surface of the paper, the ink on the paper is dried and the roll paper such as magenta can be sent between the plate cylinder and the impression cylinder. What is known is. In this printer, four yellow, magenta, cyan, and black inks are individually transferred, and the inks are transferred, dried, and then wound.

By the way, recently, in the gravure printing apparatus, there are increasing cases in which various kinds of printed matter are printed little by little. Therefore, in a printing unit for transferring each ink of yellow, magenta, cyan, and black, a plate cylinder and Research is being conducted on two sets of impression cylinders and two doctor units.

In such a printing unit, a plurality of plate cylinders (for example, a first plate cylinder and a second plate cylinder) and a plurality of impression cylinders (a first impression cylinder and a second impression cylinder) are provided in each printing unit. Further, each plate cylinder is provided with a doctor unit having a doctor blade.

The first impression cylinder is disposed above the first plate cylinder, and the first impression cylinder and the first plate cylinder relatively approach and separate from each other. In addition, the second impression cylinder is arranged above the second plate cylinder,
The second impression cylinder and the second plate cylinder relatively approach and separate from each other.
A skew roll for guiding the paper between the impression cylinder and the plate cylinder is provided on the upstream side of the first impression cylinder, and the paper emerging from the impression cylinder and the plate cylinder is provided on the downstream side of the second impression cylinder. There is a roll to guide you to.

In the case of printing with the first plate cylinder and the first impression cylinder, the first impression cylinder and the first impression cylinder are brought into contact with each other via paper, while the second impression cylinder and the second impression cylinder are contacted with each other. The plate cylinder is separated from the plate cylinder to allow the paper to pass through. The paper with the curl corrected from the roll paper passes from the skew roll to the nip point between the first plate cylinder and the first impression cylinder, and further, the space between the second plate cylinder and the second impression cylinder. It is designed to pass through and be guided to the color roll.

When printing with the second plate cylinder and the second impression cylinder, the first impression cylinder and the first impression cylinder are separated from each other, and the second impression cylinder and the second impression cylinder are separated from each other. Contact via paper. When printing with the second plate cylinder and the second impression cylinder, the paper extending from the roll paper passes from the skew roll through the space between the first plate cylinder and the first impression cylinder, and It passes through the nip point between the second plate cylinder and the second impression cylinder and is guided to the roller.

If the diameter of the plate cylinder before replacement is different from the diameter of the plate cylinder after replacement, the plate cylinder is raised until it comes into contact with the impression cylinder. In this conventional technique, adjustment of printing pressure raises the plate cylinder. It is adjusted by the force that pushes up the impression cylinder.

[0009]

However, in the case of such a gravure printing apparatus, the nip point A between the first plate cylinder and the first impression cylinder and the second plate are provided between the skew roll and the roller roll. Since the cylinder and the nip point B of the second impression cylinder are widely separated from each other, at the nip point A and the nip point B, the paper entry angle α with respect to the tangent line of each nip point A, B
1 and α2 are different from each other, and the exit angles β1 and β2 of the paper with respect to the tangent line of the nip points A and B are also different.
For this reason, there is a possibility that a defect may occur in the reproducibility of printing that requires that the print quality such as the tone of color tone and the lightness is uniform.

In addition, the printing pressure is adjusted by the force for lifting the plate cylinder, and when the diameter of the plate cylinder before replacement and the diameter of the plate cylinder after replacement are different and the weight difference of the plate cylinder is large, the accuracy of There is a problem that it is difficult to adjust high printing pressure.

Further, when replacing the first plate cylinder or the second plate cylinder, it is necessary to separate the doctor blade from each plate cylinder, but each doctor unit is placed in a narrow space near each plate cylinder. Since it is installed, there is also a problem that it is very difficult to rotate the doctor unit.

When the first plate cylinder and the second plate cylinder are replaced with those having a large diameter or a small diameter, the heights of the nip points A of the first impression cylinder and the first plate cylinder, and Since the heights of the nip points B of the second impression cylinder and the second plate cylinder are different,
It is very difficult to adjust the printing pressure of the second impression cylinder, and the entrance angles α3 and α4 and the exit angles β3 and β4 of the paper at the nip points A ′ and B ′ after the plate cylinder replacement are all different, and Another problem is that it is difficult to ensure reproducibility.

The gravure printing apparatus according to the present invention has been made in view of such a problem, and is a gravure printing apparatus in which a plurality of sets of impression cylinders and plate cylinders are provided in a printing unit for transferring one ink. In the apparatus, the entrance and exit angles of the printed matter at the nip point on the upstream side and the nip point on the downstream side are constant, and even if the plate cylinder is replaced with a thin or thick one, the upstream side The height of the nip point on the downstream side does not change, and the input and output angles of the printed matter do not change, resulting in uniform and good printing reproducibility. Easy to adjust,
It is an object of the present invention to provide a gravure printing device in which the doctor unit can be easily operated.

[0014]

In order to solve the above-mentioned problems, a gravure printing apparatus according to claim 1 of the present invention uses a doctor after depositing an ink to be transferred onto a printing substrate for printing on the surface. A nip in which a plate cylinder that scrapes off excess ink and an impression cylinder that presses the plate cylinder via the printing substrate are provided, and the plate cylinder and the impression cylinder make contact with each other via the printing substrate. At a position upstream of the printing base material from a point, a first roll that supports the printing base material so that the entering angle with respect to the horizontal plane of the printing base material at the nip point is constant is provided, and a downstream side from the nip point is provided. In a gravure printing apparatus having a second roll that supports the printing substrate so that the projection angle with respect to the horizontal plane of the printing substrate that comes out from the nip point is constant, the moving region of the printing substrate. The plate cylinder below A plurality of plate cylinder support unit for conversion movably supported is, is removably arranged so that each plate cylinder are arranged in parallel with respect to the impression cylinder, the left and right sides of the printing substrate,
A pair of left and right slide plates integrally coupled to each other is disposed so as to be slidable in the longitudinal direction of the printing substrate, and at least the first roll, the impression cylinder, and the second roll are provided between the pair of left and right slide plates. Are rotatably supported, respectively.

In the gravure printing apparatus according to a second aspect of the present invention, the mechanism for supporting the plate cylinder of each of the plate cylinder support devices is mounted on the plate cylinder regardless of the diameter of the plate cylinder to be mounted. A height adjusting mechanism that sets the height of the plate cylinder based on the height of the contact position of the plate cylinder is provided so that the height of the contact position that contacts the impression cylinder matches the height of the nip point. ,
The pair of slide plates is provided with a printing pressure adjusting mechanism that presses the impression cylinder toward the plate cylinder to adjust the printing pressure.

Further, the gravure printing apparatus according to claim 3 of the present invention is the gravure printing apparatus according to claim 1 or 2, wherein the doctor blade is in contact with the surface of the plate cylinder between the pair of left and right slide plates. A doctor unit for scraping off ink by means of is provided so that the rotation angle can be adjusted, and this doctor unit has a displacement mechanism for adjusting the rotation center line of this doctor unit in the approaching and separating direction with respect to the plate cylinder, It is characterized by being supported by the slide plate.

[0017]

According to the gravure printing apparatus of the first aspect of the present invention, since the first roll, the impression cylinder and the second roll are previously supported between the pair of left and right slide plates that are coupled to each other, the impression cylinder The entrance angle and the exit angle with respect to the tangent line of the printing substrate at the nip point between the plate cylinder and the plate cylinder are always constant. As a result, even if you change the plate cylinder that slides the slide plate from one plate cylinder to another and changes the printing, there is no change in ink transfer, and the print quality is uniform, such as shades of color and brightness. Reproducibility is improved. A plurality of plate cylinders can be supported by one impression cylinder and the first roll and the second roll. In addition, since each plate cylinder support device can be inserted and removed, it is easy to set and replace the plate cylinder.

According to the gravure printing apparatus of the second aspect of the present invention, the height adjusting mechanism for setting the height of the plate cylinder based on the height of the contact position of the plate cylinder with the impression cylinder is provided. Since the slide plate is equipped with a printing pressure adjustment mechanism that presses the impression cylinder against the plate cylinder to adjust the printing pressure, the diameter of the plate cylinder to be mounted differs before and after replacement, and the height of the top of the plate cylinder changes. Even if the height becomes low, the printing pressure is adjusted on the lighter impression cylinder side by raising the uppermost position of the plate cylinder after replacement to the height of the nip point between the impression cylinder and plate cylinder before replacement. be able to. That is, it is much easier to adjust the printing pressure after replacing the printing cylinder than to adjust the printing pressure on the heavy printing cylinder side.
The printing pressure adjustment accuracy is improved compared to the conventional case.

Further, the slide plate can slide between a plurality of plate cylinders while keeping the entrance and exit angles of the printing base material at the nip points between the plate cylinders and the impression cylinder constant, and the height of the nip points can be increased. Is constant, the length of the paper path between the nip points of the plurality of printing units is substantially constant. Therefore, the initial registration of the printing substrate can be simplified even when the plate cylinder is exchanged with one having a different diameter.

Further, since the height of the nip point between the impression cylinder and the plate cylinder becomes constant, the angle and position of the doctor blade contacting the plate cylinder become substantially constant, and the position where the doctor blade and the plate cylinder contact each other is adjusted. Can be reduced. Since the adjustment amount of the doctor blade is reduced, the doctor blade can be easily adjusted and the peripheral portion of the doctor unit can be simplified to improve the mechanical strength of the doctor blade, making it easier to achieve accuracy and printing reproducibility. It is improved, and the restrictions on the installation of ink pans and splash covers are free.

Further, according to the gravure printing apparatus of claim 3, by changing the plate cylinder, for example, by replacing a thick plate cylinder with a thin plate cylinder, the angle at which the doctor blade contacts the surface of the plate cylinder, and the plate cylinder. Even if the distance from the nip point between the platen and the impression cylinder to the contact position between the doctor blade and the plate cylinder differs before and after the plate cylinder replacement, the center of rotation of the doctor blade is moved closer to and away from the plate cylinder side. This makes it very easy to adjust the contact angle of the doctor blade and the distance from the nip point to the doctor blade.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A gravure printing apparatus according to embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 shows a schematic structure of the gravure printing apparatus of this embodiment, and 1 shows the entire gravure printing apparatus.

The gravure printing apparatus 1 prints a wallpaper sheet as an example of a printing base material wound in a roll shape, and in this embodiment, a surface decorative makeup paper for a building interior material of a house. However, the sheet-like material to be printed is a paper base such as a roll of paper such as a web or a plastic sheet,
Alternatively, a plastic film, unwoven cloth, or woven cloth may be used as a kind of sheet.

The sheet material 2 is wound into a roll and supported by the unwinding unit 3. Although the unwinding unit 3 supports two rolls, the sheet material 2 is unwound from one roll via a guide roll.
The sheet material 2 is unwound from the unwinding unit 3 and the curl is corrected by the straightening roll group 4.

After passing through the straightening roll group 4, the sheet material 2 passes through the printing units 5, 6, 7, 8 and the drying units 9, 10, 11, 12 at four places, and the guide roll group 1
The winding unit 14 is reached via 3. The sheet material 2 sent to the winding unit 14 is wound around a roll shaft rotated by a motor (not shown).

The straightening roll group 4 is supported by bearings of a pair of left and right infeed frames 16 that support one end of the lower beam 15. The guide roll group 13 is supported by a bearing of an outfeed frame 17 that supports the other end of the lower beam 15. Posts 18 and 19 are provided upright in the vicinity of both ends of the lower beam 15, and the upper beam 20 is supported by the posts 18 and 19.

Below the lower beam 15, four printing units 5, 6, 7, 8 are arranged, and between the upper beam 20 and the lower beam 15, drying units 9, 10 are provided. , 11, 12
Is provided.

Since the respective printing units 5, 6, 7, 8 have the same construction, the construction of one of the printing units 5, 5 will be explained, and the construction and operation of the remaining printing units 6, 7, 8 will be explained. The configuration and operation of the printing unit 5 are incorporated. Since the drying units 9, 10, 11, and 12 have the same configuration, the configuration and operation of the drying unit 9, which is one of them, will be described, and the configuration and operation of the other drying units 10, 11, 12 will be described. The explanation of the structure and operation of the drying unit 9 is incorporated in the explanation of 1.

The printing unit 5 is arranged between pillar-shaped lower frames 22, 23 and 24 which are erected between the lower beam 15 and the bed 21 on the floor. The lower frames 22, 23, 24 are arranged laterally at the left and right ends of the sheet material 2, and are provided at positions that do not hinder the traveling of the sheet material 2. Pits 21a and 21b are formed in the bed 21, and the plate cylinder support device 25 is located in the pits 21a and 21b.

6 and 7 show the construction of the plate cylinder supporting device 25. The plate cylinder support device 25 includes a frame 26 having four casters 26 a. A bearing portion 27 is provided upright on the upper portion of the frame 26. The pair of left and right bearing portions 27, 27 is a rotary shaft 31 of the plate cylinder 32. I support you. The bearing portion 27 is provided with a semi-arcuate fixing ring 27c that rotates around a pin 27a and is fixed by a bolt 27b. The end of the rotary shaft 31 rotates between the fixing ring 27c and the bearing portion 27. Held possible. The rotary shaft 31 of the plate cylinder 32 is connected to a servo motor (not shown) via a coupling portion 33 and a gear box 34, and a clutch in the gear box 34 connects and disconnects the rotary shaft 31 and the servo motor. It has become.

The height adjusting device of the plate cylinder supporting device 25 includes a wheel 28 provided on a side portion of the frame 26, a screw shaft 29 provided at a position facing the frame 26 of the lower frames 22, 23, 24. The block 30 has a nut portion, and a rotating means such as a handle (not shown) for rotating the screw shaft 29 via a gear mechanism. When the handle is rotated clockwise, for example, and the screw shaft 29 is rotated clockwise, the block 30 rises and the plate cylinder support device 25 rises via the wheels 28. When the handle is rotated counterclockwise, the screw shaft 29 descends, the block 30 descends, and the plate cylinder support device 25 descends via the wheels 28. The upper and lower parts of the screw shaft 29 are rotatably held by the lower frames 22, 23, 24, and the screw shaft 29 connects the line connecting the rotation centers of the plate cylinder 32 and the impression cylinder 42 to the sheet material 2. The uppermost portion Hp of the printing surface of the plate cylinder 32 is rotated to the position of the nip point Np, which is the intersection point of. Of course, the screw shaft 29 may be rotated by a motor or the like via a gear mechanism instead of the handle.

A protrusion 26b is provided on the lower end of the frame 26 on the gearbox 34 side, and the protrusion 26b is fixed by a tiltable L-shaped block 36c provided on a rod 36a of an air cylinder 36. Block 36c
The extension of the rod 36a causes the inclined surface of the slide plate 36d to move out of the region of the protrusion 26b, thereby allowing the protrusion 26b to slide. 27d is a grip for sliding the plate cylinder supporting device 25, 26c is an ink tank, and 26d is an ink tank 26.
It is a shaft that supports c.

Although the height adjusting device is constituted by the jack mechanism in the above embodiment, it may be constituted by a hydraulic cylinder, an air cylinder or a gear mechanism.

An upper frame 37 is attached to the upper portions of the lower frames 22, 23, 24 located upstream and downstream of the flow of the sheet material 2 of the printing unit 5, and the upper frame 37 is horizontally mounted. A pair of vertically extending guide shafts 38, 38 are provided. The upper frames 37 are placed opposite to each other so as to be located near the left and right ends of the sheet material 2. Reinforcing ribs 37a are provided on the upper and lower ends of the upper frame 37 to support the weight of the slide plate 40, the impression cylinder 42 and the backup roll 41.
Are formed.

The pair of upper and lower guide shafts 38, 38 constitutes the guide member of the present invention. Although this guide member is constituted by the guide shafts 38, 38 here, it may be constituted by a guide groove. Guide shaft 3
Although only one of the reference numerals 8 and 38 is shown in FIG. 2, the reference numerals 8 and 38 are disposed at both left and right ends of the sheet material 2 of the gravure printing apparatus 1, and the bearings of the slide plate 40 are provided on the left and right guide shafts 38 and 38, respectively. 39 is slidably mounted. The bearing 39 and the guide shafts 38, 38 are fitted by a concave groove so as to be precisely guided.

FIG. 5 shows a state in which the left and right slide plates 40 of this embodiment are integrally assembled.

The pair of left and right slide plates 40 includes a backup roll 41, an impression cylinder 42, a stay 40a, a synchronizing shaft 40b, and a skew roll 6 as a first roll.
8. The left and right slide plates 40, 40 are integrally connected to each other through the roller roll 69 serving as a second roll, and the pinion gear 40c provided at both ends of the synchronous shaft 40b and the rack 40d mesh with each other. And then slide in sync.

Hydraulic cylinders 43 (printing pressure adjusting mechanisms) are supported and fixed to the upper portions of the left and right slide plates 40, 40 by bearings 44, respectively.
The first support plate 46 is attached to the tip of the rod 45 that expands and contracts.
Is attached. A guide shaft 47 fixed to the surface of the slide plate 40 and extending in the up-down direction is provided on the surface of the first support plate 46 on the slide plate 40 side, and a slider 48 fitted by a dovetail groove protrudes from the guide shaft 47. It is set up. A bearing hole 49 is formed in the lower end portion of the first support plate 46, and the bearing 50 fixed to the rotating shaft 41 a of the backup roll 41 is fitted into the bearing hole 49. The backup roll 41 is provided so that the pressing force of the impression cylinder 42 is uniformly applied in the length direction.

The bearing 50 is fixed by a fixing plate 51 so as not to easily fall out of the bearing hole 49.
It can be removed from the bearing hole 49 by removing 1. A recess 46a is formed in the center of the first support plate 46 to reduce the weight and further increase the rigidity.

At both ends of the first support plate 46, a second support plate 53 for supporting the impression cylinder 42 is provided with a connection plate 54 and a connection pin 56.
Are connected via. The upper portion of the connecting plate 54 is fixed to both ends of the first supporting plate 46 by bolts, and the lower portion of the connecting plate 54 has an elongated hole 55 extending vertically. A connecting pin 56 is projectingly provided on both ends of the second support plate 53, and the connecting pin 56 is supported by the elongated hole 55 so as to be vertically movable. A bearing hole 57 is opened at the lower end portion of the second support plate 53, and a bearing cylinder portion 59 having a handle 58 is fitted into the bearing hole 57. The slide plate 40 is also attached to the surface of the second support plate 53 on the slide plate 40 side.
The slider 62 fitted with the guide shaft 47 and the dovetail groove is fixed.

The second support plate 53 and the first support plate 46 are separated by a clearance 63 formed by the connecting plate 54. The lower end of the first support plate 46 covers the upper end of the second support plate 53, and the backup roll 41
The impression cylinder 42 and the impression cylinder 42 can be brought into contact with and separated from each other at a position close to each other.

The hydraulic cylinder 43 is connected to the hydraulic pump P by a hydraulic circuit 64. The hydraulic circuit 64 is provided with a switching device 65 that switches the rod 45 of the hydraulic cylinder 43 so as to expand and contract.

The upper frame 37 is provided with a hydraulic cylinder 66 connected to the hydraulic pump P via a hydraulic circuit 66a as a driving means for the slide of the slide plate 40, and the slide plate is adjusted by the expansion and contraction of the hydraulic cylinder 66. Forty slide adjustments are made.

Further, the left and right slide plates 40, 4
Between 0, the skew roll 68 (first roll), the roller 69 (second roll), and the doctor unit 70
Is supported.

The skew roll 68 is for adjusting the distance between the left and right end portions of the sheet material 2 and the left and right end portions of the plate cylinder 32, and the left and right of the design of the plate cylinder 32 (the end portion of the plate cylinder 32 in the longitudinal direction). ) Is deviated in the vertical direction of the sheet material 2, the left and right end portions of the skew roll 68 and the left and right end portions of the plate cylinder 32 are approached or moved in accordance with the positional deviation of the pattern on the plate cylinder 32. By separating the sheets, the sheet material 2 that contacts the plate cylinder 32 is aligned. Color roll 6
Reference numeral 9 is a type of guide roll that guides the sheet material 2 to the guide roll group 79.

The skew roll 68 and the color roll 69 are
As shown in FIG. 9, a nip point N between the plate cylinder 32 and the impression cylinder 42
It is rotatably attached to the slide plate 40 so as to form constant angles α and β with respect to the horizontal line HL at p. In this embodiment, the slide plate 4
Slide 0 to a predetermined position and backup roll 4
When the pressure drum 42 is pressed by 1, the pressure drum 42 moves the sheet material 2
The plate cylinder 32 is pressed through the sheet cylinder 32, and the entrance angle α and the exit angle β of the sheet material 2 become constant with respect to the horizontal line HL at the nip point Np between the plate cylinder 32 and the impression cylinder 42.

In this embodiment, the nip point Np is a contact point where the plate cylinder 32 and the impression cylinder 42 come into contact with each other via the sheet material 2, and the center of rotation of each of the plate cylinder 32 and the impression cylinder 42. The intersection of the straight line connecting the lines and the circumferences of the plate cylinder 32 and the impression cylinder 42. In addition, the entry angle α at the nip point Np of the sheet material 2
Means the angle between the sheet material 2 and the horizontal line HL at the position where the sheet material 2 starts contacting with the impression cylinder 42, and the projection angle β of the sheet material 2 means that the sheet material 2 starts to separate from the impression cylinder 42. The angle between the sheet material 2 and the horizontal line HL at the position.
Further, the slide plate 40 is provided with an arm or a plurality of mounting holes or holders for detachably supporting the skew roll 68 and the roller roll 69, for example, by adjusting the angle of the arm or changing the mounting position of the rolls 68, 69. , Depending on the type of printing substrate,
It is also conceivable to change and adjust the angle .alpha.

For example, in the case of a printing machine having a low printing pressure such as printing of film, there is no backup roll 41, and the impression cylinder 42 is moved up and down by a hydraulic cylinder 43 to apply pressure. Good.

A doctor unit 70 is rotatably supported on the lower portion of the slide plate 40. The doctor unit 70 is rotatably supported via a mounting shaft 71, and in order to correspond to the plate cylinder 72 having a small diameter, the rotation center is displaced so that the rotation center can be shifted to a lower position. A displacement mechanism is provided.

FIG. 8 shows a displacement mechanism of the doctor unit 70.

The displacement mechanism of the doctor unit 70 is shown in FIG.
Shown in FIG. 7, a long hole 76 opened at the lower end portion 40 e on the left side of the slide plate 40, guide shafts 71 a and 71 a provided on both sides of the long hole 76, and a doctor unit 70.
Holder 71b for holding the mounting shaft 71 of
1b, a screw 71c, a bearing 71d rotatably provided at the lower end of the doctor unit 70, and a screw 7
1c and the nut 71e screwed together. The lower part of the holder 71b is slidably attached to the guide shafts 71a, 71a.
The mounting shaft 71 held by is rotatable.

The elongated hole 76 is inclined, and by rotating the nut 71e, the doctor unit 70 can be moved closer to the center of rotation of the thin plate cylinder 72, and the doctor unit 70 can be moved away from the plate cylinder 72. It has become.

The blade 73 at the tip of the doctor unit 70 is sandwiched by the blade holder 73a, and the blade holder 73a is rotated by the rotation of the tightening handle 74.
It can be attached and detached together with. Reference numeral 75 is a cover that prevents ink droplets from the blade 73.

The doctor unit 70 pressurizes the plate cylinder 32 via a doctor blade 73 by pressurizing an air cylinder (not shown) provided on a mounting shaft 71. In the doctor unit 70, the doctor blade 73 abuts on the surface of the plate cylinder 32 by the pressing force of the air cylinder after the plate cylinder 32 moves up to the nip point Np.

As indicated by the alternate long and short dash line in FIG. 1, the solid line 3
When the plate cylinder 72 having a diameter smaller than 2 is replaced, the uppermost part Hp of the printing surface of the plate cylinder 72 is raised to the nip point Np, and then the displacement center of the doctor unit 70 is used to rotate the center of rotation of the doctor blade 73. Is displaced diagonally downward. After fixing the displaced position, the doctor unit 70 is rotated by manual operation, and then the doctor blade 73 is brought into contact with the plate cylinder 72 by pressurizing the air cylinder.

When the doctor blade 73 is brought into contact with the plate cylinder 72, as shown in FIG. 8, even if the plate cylinder 32 and the plate cylinder 72 have different diameters, the uppermost portion Hp of the plate cylinder 72 is moved to the nip point Np.
Therefore, the distance 1 from the nip point Np to the position Tp where the doctor blade 73 contacts the plate cylinder 72 and the angle γ between the doctor blade 73 and the plate cylinder 72 are
Since it does not change much compared to the case of the plate cylinder 32, the position of the doctor blade 73 can be easily adjusted, a relatively simple and sturdy mechanism can be used without using a complicated mechanism, and the strength of the doctor unit 70 can be reduced. It can be prevented.

The drying unit 9 has a lower drier 77 arranged on the upper part of the lower beam 15, an upper drier 78 arranged on the upper part of the upper beam 20, and an arc shape on the lower drier 77. A group of guide rolls 79 arranged, a group of guide rolls 80 arranged in an arc shape in the upper dryer 78, an air supply duct 81 and an exhaust duct 82 provided in the lower dryer 77 and the upper dryer 78. , A turn roll 83 and a guide roll 84.

In the lower dryer 77, the sheet material 2 on the lower surface of which is placed on the plate cylinder 32 is guided by the guide roll group 79 and rises while drawing a circular arc, and is sent from the air supply duct 81 (for example, air). The drying of the ink is promoted by the hot air, and is further sent to the guide roll group 80 of the upper dryer 78. The upper dryer 78 is further dried by the dry air sent from the air supply duct 81. The sheet material 2 that has been dried by the upper dryer 78 is guided by the turn roll 83 and the guide roll 84 and sent to the printing unit 6 in the next step.

Reference numeral 85 is a guide roll provided on the lower frame 22, and 86 is a guide roll provided on the lower beam 15.

In the gravure printing apparatus of this embodiment, as shown in FIG. 3, the plate cylinder 32 on the upstream side in the flow of the sheet material 2 is used.
While printing is being performed, the plate cylinder 32 ′ on the downstream side in the flow of the sheet material 2 can be set.

When printing on the sheet material 2 with the plate cylinder 32 'on the downstream side, a desired plate cylinder 32' is set on the downstream side. At this time, the height of the uppermost portion Hp of the printing surface of the plate cylinder 32 'is lower than the nip point Np. During replacement of the plate cylinder 32, the sheet material 2 is running.

When the desired plate cylinder 32 ′ is set on the downstream side, the hydraulic cylinder 43 is contracted by the switching unit 65 to raise the upstream side impression cylinder 42 and separate the impression cylinder 42 from the plate cylinder 32. Next, the doctor blade 73 is rotated manually or automatically to separate it from the plate cylinder 32. When the doctor blade 73 is separated from the upstream plate cylinder 32, the screw shaft 29 is operated by the handle so that the height of the uppermost portion Hp of the printing surface of the upstream plate cylinder 32 becomes lower than the lowermost portion of the doctor unit 70. Rotate the plate cylinder 32 on the upstream side
Lower. This prevents the doctor unit 70 from contacting the plate cylinder 32 on the upstream side during sliding.

After lowering the plate cylinder 32 on the upstream side, a hydraulic pressure is applied from the hydraulic pump P to the hydraulic cylinder 66 by the switching device 67 to extend the rod, and the slide plate 40 is moved above the impression cylinder 32 'on the downstream side. .

When the bearing 39 provided on the back side of the slide plate 40 abuts on the projection 38a which is the positioning means of the guide shaft 38, the rotation center line of the impression cylinder 42 is perpendicular to the rotation center line of the plate cylinder 32 '. Located on the surface, the position of the slide plate 40 is locked on the downstream side.

When the slide plate 40 moves to the downstream side and locks the position, the plate cylinder 32 'on the downstream side is raised to adjust the height. The plate cylinder 32 ′ on the downstream side is adjusted by rotating the screw shaft 29 by operating the handle in the same manner as adjusting the height of the plate cylinder 32 on the upstream side.
Raise. When the uppermost portion Hp of the printing surface of the plate cylinder 32 ′ reaches the same height as the nip point Np between the plate cylinder 32 on the upstream side and the impression cylinder 42 when the plate cylinder 32 ′ is raised, the rotation operation of the screw shaft 29 is stopped. Then, the position of the uppermost portion Hp of the printing surface of the plate cylinder 32 'is kept constant.

A limit switch or an optical sensor is used to detect whether or not the uppermost position of the printing surface of the plate cylinder 32 'is at the same height as the nip point Np between the upstream plate cylinder 32 and the impression cylinder 42. Etc. For example, the plate cylinder support device 25
On the lower frames 22, 23, 24 on both sides of the plate cylinder 3
A limit switch or a light emitting element and a light receiving element are provided at a position where the uppermost position of the printing surface of 2'is located at the same height as the nip point Np between the plate cylinder 32 and the impression cylinder 42 on the upstream side. The detection is made by providing a protrusion or a reflection mirror on the side of the body supporting device 25 for contacting the limit switch and turning on the limit switch.

Before stopping the uppermost part of the printing surface of the plate cylinder 32 'at the height of the nip point Np, the plate cylinder 32' is connected to the output shaft of the servomotor via a gear mechanism and a clutch mechanism. .

Next, when the switch 65 is operated to supply the hydraulic pressure from the hydraulic pump P to the hydraulic cylinder 43 to extend the rod 44 of the hydraulic cylinder 43, the pressure is applied to the plate cylinder 32 'on the downstream side via the sheet material 2. The cylinder 42 contacts, and the backup roll 41 contacts the impression cylinder 42. As a result, a predetermined printing pressure can be applied to the sheet material 2 between the plate cylinder 32 ′ on the downstream side and the impression cylinder 42.

As described above, after the predetermined printing pressure is secured, since the entrance angle α and the exit angle β of the sheet material 2 can be made constant on the downstream plate cylinder 32 'side, the downstream plate cylinder 32'. However, printing can be performed under the same conditions as the plate cylinder 32 on the upstream side.

As described above, according to the gravure printing apparatus of this embodiment, the impression cylinder 42, the backup roll 41, the skew roll 68, and the roll roll 6 are attached to the slide plate 40.
9. Since the doctor unit 70 is integrally mounted and the slide plate 40 is slid, the plate cylinder 32 and the impression cylinder 42
The input angle α and the output angle β of the sheet material 2 are always constant at the nip point Np of the, and the reproducibility of the printed matter that uniform printing is improved, and high-quality, small-lot printed matter is printed at low cost. It becomes possible to do.

By operating the handle of the screw shaft 29 and the switching devices 65 and 67, the height of the plate cylinder supporting device 25, the slide of the slide plate 40, and the impression cylinder 42 and the backup roll 41 can be adjusted. Since the printing pressure can be adjusted easily, the printing pressure can be easily adjusted.
The time for stopping the traveling of the sheet material 2 at the time of exchanging 2 becomes extremely short, and it becomes possible to print a large amount of a small amount of printed matter in a short time.

Furthermore, since the height of the nip point Np between the impression cylinder 41 and the plate cylinder 32 is constant, the angle γ at which the doctor blade 73 hits the plate cylinder 32 and the distance 1 are substantially constant.
The adjustment of the contact position between the doctor blade 73 and the plate cylinder 32 can be reduced. Since the adjustment amount of the doctor blade 73 is reduced, the doctor blade 73 can be easily adjusted, and the peripheral portion of the doctor unit 70 can be simplified to improve the mechanical strength of the doctor blade 73 and improve the accuracy, thereby improving the printing accuracy. Reproducibility is improved,
Ink pans and splash covers can be installed freely.

Although the sliding movement of the slide plate 40 and the vertical movement of the pressure drum 42 and the backup roll 41 are performed by the hydraulic mechanism, they may be performed by an air cylinder, a gear mechanism or the like. Further, although the present embodiment is applied to the gravure printing apparatus, it can also be applied to a gravure coater, a dry laminator, and the like.

[0075]

According to the gravure printing apparatus of the present invention, a plurality of plate cylinders are removably arranged below the moving area of the sheet material, and a pair of left and right plates are arranged on both left and right sides of the sheet material. The slide plate is slidable in the longitudinal direction of the sheet material, and at least the first roll, the impression cylinder, and the second roll are provided between the pair of left and right slide plates. As a result, the plate cylinders to be printed can be exchanged very easily, and the entrance and exit angles of the sheet material are always constant at the nip point between the impression cylinder and each plate cylinder, so that a uniform Printing can be performed, and the time for stopping the entire printing apparatus when the plate cylinder is replaced can be significantly shortened, and the shortening of the printing time can be promoted.

Therefore, even when the plate cylinder needs to be replaced frequently, such as in the case of printing various kinds of small quantities, the time required for the plate cylinder replacement can be shortened and the cost of the printed product can be reduced. Since the miniaturization can be promoted, the low cost of the printing apparatus can be promoted.

According to the gravure printing apparatus of claim 2, in addition to the effects of the gravure printing apparatus of claim 1,
Since the height of the nip point between the impression cylinder and the plate cylinder becomes constant, the angle and position where the doctor blade hits the plate cylinder becomes almost constant, and the adjustment of the contact position between the doctor blade and the plate cylinder can be reduced. it can. Since the adjustment amount of the doctor blade is reduced, the doctor blade can be easily adjusted and the peripheral portion of the doctor unit can be simplified to improve the mechanical strength of the doctor blade, making it easier to achieve accuracy and printing reproducibility. It is improved, and the restrictions on the installation of ink pans and splash covers are free.

Further, according to the gravure printing apparatus of claim 3, by changing the plate cylinder, for example, a thick plate cylinder is replaced with a thin plate cylinder, the angle at which the doctor blade contacts the surface of the plate cylinder and the plate cylinder Even if the distance from the nip point between the platen and the impression cylinder to the contact position between the doctor blade and the plate cylinder differs before and after the plate cylinder replacement, the center of rotation of the doctor blade is moved closer to and away from the plate cylinder side. This makes it very easy to adjust the contact angle of the doctor blade and the distance from the nip point to the doctor blade.

[Brief description of drawings]

FIG. 1 is an enlarged view of a slide plate portion of a gravure printing apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a bearing portion of a slide plate portion of FIG.

FIG. 3 is an enlarged view of a plate cylinder supporting device of a gravure printing device according to an embodiment of the present invention.

FIG. 4 is a schematic diagram showing an overall configuration of a gravure printing apparatus according to an embodiment of the present invention.

5 is a perspective view of a slide plate portion of FIG.

6 is a front view showing the plate cylinder supporting device and the height adjusting device of FIG. 1;

7 is a side view showing the plate cylinder supporting device and the height adjusting device of FIG. 1. FIG.

8 is a diagram showing a configuration of a displacement device of the doctor unit of FIG.

9 is a diagram showing the relationship between the entry angle and the exit angle at the nip point between the plate cylinder and the impression cylinder of FIG.

[Explanation of symbols]

 1 Gravure printing device 2 Sheet material 5 Printing unit 9 Drying unit 25 Plate cylinder support device 28 Wheels 29 Screw shaft 30 Block 31 Rotating shaft 32 Upstream plate cylinder 32 'Downstream plate cylinder 38 Guide shaft 38a Protrusion 40 Slide plate 41 Backup roll 42 Impression cylinder 43 Hydraulic cylinder (printing pressure adjusting mechanism) 46 First support plate 47 Guide shaft 48 Slider 53 Second support plate 54 Connecting plate 55 Long hole 56 Connecting pin 64 Hydraulic circuit 65 Switching device 66a Hydraulic circuit 67 Switching device 68 Skew Roll (First Roll) 69 Coro Roll (Second Roll) 70 Doctor Unit 71a Guide Shaft 71b Oblong Hole

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masami Shiina 6-1-1 Aoto, Katsushika-ku, Tokyo Fuji Machine Industry Co., Ltd.

Claims (3)

[Claims] 1. A plate cylinder in which excess ink is scraped off by a doctor blade after depositing ink to be transferred onto a thin printing substrate such as web, paper, film, sheet, etc. An impression cylinder that presses through a printing substrate, and a position on the upstream side of the printing substrate from a nip point where the plate cylinder and the impression cylinder contact through the printing substrate, at the nip point. A first roll that supports the printing substrate is provided so that the entering angle of the printing substrate with respect to the horizontal plane is constant, and a horizontal plane of the printing substrate that comes out of the nip point is provided at a position downstream of the nip point. In a gravure printing apparatus provided with a second roll that supports the printing substrate so that the projection angle with respect to the printing substrate is constant, a plurality of plates that replaceably support the plate cylinder are provided below a moving region of the printing substrate. Each body support device The plate cylinders are removably arranged in parallel with the impression cylinder, and a pair of left and right slide plates integrally connected to the left and right sides of the printing base material in the longitudinal direction of the printing base material. A gravure printing apparatus, wherein at least the first roll, the impression cylinder, and the second roll are rotatably supported between the pair of left and right slide plates. 2. The gravure printing apparatus according to claim 1, wherein the mechanism for supporting the plate cylinder of each of the plate cylinder supporting devices comprises:
Based on the height of the contact position of the plate cylinder so that the height of the contact position of the plate cylinder in contact with the impression cylinder matches the height of the nip point regardless of the diameter of the plate cylinder to be mounted. A height adjusting mechanism for setting the height of the plate cylinder is provided, and the pair of slide plates is provided with a printing pressure adjusting mechanism for pressing the impression cylinder toward the plate cylinder to adjust the printing pressure. A gravure printing device characterized in that 3. The gravure printing apparatus according to claim 1 or 2, wherein a rotation angle of a doctor unit for scraping ink by a doctor blade in contact with the surface of the plate cylinder is adjustable between the pair of left and right slide plates. The doctor unit is supported by the slide plate via a displacement mechanism that adjusts the rotation center line of the doctor unit in the approaching and separating directions with respect to the plate cylinder. Gravure printing equipment.