JPS62924Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a guide roll holding device intended for gravure printing machines, especially gravure printing machines for building materials.

Generally, there are various types of printing sheets for printing building materials such as wood grain patterns, and for example, thin paper, titanium paper, and vinyl chloride film are often used.

Gravure printing machines for building materials are equipped with printing units for each color in order to perform multicolor printing on these rolled sheets. Each printing unit is equipped with a plate cylinder and an impression cylinder, and the sheet to be printed passes between these cylinders of each printing unit and is printed in multiple colors.In each printing unit, after printing, the sheet rises upward and is injected with ink. It is designed to pass through a drying device. Therefore, the sheet to be printed runs in a circular arc toward the impression cylinder located above the plate cylinder.

However, when printing on vinyl chloride film or the like as a printing sheet, if the film draws an arc immediately after passing between the impression cylinder and the plate cylinder and contacts the impression cylinder side for too long, the printing ink may transfer. It was found that sex worsened.

In order to prevent this, the present invention installs a new guide roll immediately after the contact point between the plate cylinder and the impression cylinder so that the film comes out in the common tangential direction of both cylinders, thereby improving ink transferability. It is something that we try to do.

Furthermore, in gravure printing machines, the diameter of the plate cylinder varies depending on the type of plate pattern (wood grain pattern, etc.).
If the plate cylinder diameters differ, the vertical contact position between the impression cylinder and the plate cylinder will vary. The present invention is further devised so that the position of the guide roll can be easily adjusted in order to respond appropriately to this variation.

In addition, while the synthetic resin sheet is traveling through the printing press, it comes into contact with impression cylinders, plate cylinders, guide rolls, etc. and is charged with static electricity, but this static electricity can work to prevent ink transfer or even cause sparks. It is also a cause of fires.

It is thought that a large amount of this static electricity is generated especially immediately after passing through the impression cylinder, so in the present invention, a device for removing this static electricity is provided in the vicinity of the guide roll in the form of a rod and is moved integrally with the guide roll. It has been devised so that it can be done.

Furthermore, if the synthetic resin film is very thin, vertical wrinkles will occur due to the tensile force in the running direction that is applied during running, reducing the value of the product.

Furthermore, a similar phenomenon occurs when printing on thin paper or the like. To prevent such a situation from occurring, printing presses are usually provided with expander rolls. This is a guide roll in which a flexible rubber tube is inserted through an eccentric shaft via a ball bearing.

This is provided only when printing the above-mentioned thin material.

Therefore, in the present invention, in order to make this expander roll replaceable depending on the difference between the guide roll and the sheet to be printed, we devised a means for holding the guide roller, thereby making the printing machine more versatile. It is a diagram.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1 to 3 show a first embodiment of the present invention.

In the figure, the guide roll 10 is provided on or near a plane that includes a common tangent at the contact area between the plate cylinder 12 and the impression cylinder 14 in each unit of the gravure printing machine, and on the discharge side of the printing sheet 16. .

The guide roll 10 is fixed at both ends of its shaft 18 to a bracket 20 so as not to rotate. The roll 10 is an idle roll in which a roll body 22 and a shaft 18 are loosely fitted.

Bracket 20 is further secured to a block 24 which engages a screw 28 along a vertical plane of press frame 26.

Therefore, the guide roll 10 can be moved in the vertical direction by the rotation of the screw 28.

The screw 28 is housed in a box 30, which is fixed to the frame 26 by a support piece 32. Above the screw 28, a rotating shaft 36 equipped with a handle 34 is supported by the frame for rotating the screw.
A bevel gear 38 provided on this rotating shaft and a bevel gear 40 provided at the upper end of the screw 28 are engaged with each other. A bracket 42 for supporting the rotating shaft 36 on the frame is provided with a fixing screw 44, and by rotating the handle 34, the guide roll 10 is aligned with the plate cylinder 12 on the running path of the printing sheet 16 as shown in the second figure. After the cylinder 14 is moved on or near a plane including the common tangent at the contact portion and its position is set, it is used to prevent the vertical register from shifting due to inadvertent movement.

Note that the running path of the printing sheet indicated by a chain line 46 is a conventional one, and as shown in the figure, both cylinders 12,
Even after passing between 14 and 14, the ink still comes into contact with the impression cylinder 14, which deteriorates the transferability of the ink and makes it more likely to be charged with static electricity.Furthermore, there is a risk that vibration may occur and cause horizontal wrinkles.

By installing the guide roller 10 of the present invention, the above-mentioned problems can be made less likely to occur.

In addition, as mentioned above, the contact position between the impression cylinder 14 and the plate cylinder 12 differs depending on the type of printing plate pattern, so when the plate is replaced, the contact position between the impression cylinder 14 and the plate cylinder 12 is as shown in the upper 48 or lower 5 as shown in the figure.
According to the present invention, the guide roll 10 can be easily followed each time.

Next, this apparatus is provided with a device for removing static electricity generated during printing.
That is, another bracket 52 extending toward the impression cylinder 14 and plate cylinder 12 is connected to the bracket 20 or the shaft 18 of the guide roll so as to be freely rotatable within a predetermined angle. A rod-shaped static electricity remover 54 and a guide roll 56 for preventing the printed sheet 16 from coming into contact with this static electricity remover are held.

The static electricity eliminator 54 has a structure as shown in FIG.
2 is further fixed with a bolt nut 64. The static eliminating sheet 60 faces the printing sheet 16 running from a slit 66 provided in the pipe 58, and its opposite end is formed in a jagged manner.

Further, the static eliminating sheet 60 is formed of, for example, aluminum foil, a grafted carbon sheet, etc., and the static electricity accumulated on the printing sheet 16 is removed by the static eliminating sheet 60.
It is sucked up by the metal pipe 58 and escapes to the frame 26 of the printing press.

The purpose of making the other bracket 52 rotatable is to soften the shock applied to the printing sheet 16 when the printing sheet 16 starts running. Measures are taken such that a fixed rod 70 rests on it.

In addition, in FIGS. 1 and 2, 72 is a paper threading chain, and 74 is a normal guide roll with a sprocket.

Next, FIGS. 5 to 7 show embodiments of the present invention.

In this embodiment, the expander roll 78 uses an eccentric shaft 76 instead of the straight shaft 18.
is attached as a guide roll, giving the printing machine versatility so that it can print on both thin paper and PVC sheets, or both thin and thick materials.

In the figure, the bracket 80 differs from the previous embodiment in that it is a split mold split on a slope, one split mold 82 is fixed to the block 24 side, and the other split mold 84 is movable by a hinge 86. It has become a ceremony.

Further, in order to fix the shaft 76 of the guide roll to the bracket 80, the split die 82 has a locking pin 8 that is rotatable in the direction of the other split die 84.
8 is provided, and the other split mold 84 is provided with a groove 90 into which the locking pin 88 is inserted, and the locking pin 88 has a threaded rod 92 in order to clamp the two split molds and fix the shaft 76. connected.

At the bottom of the bracket 80 are an impression cylinder 14 and a plate cylinder 1.
Another bracket 94 extending toward the other end is connected to the shaft 96 so as to be rotatable within a predetermined angle.
4 and an auxiliary guide roll 56 are provided.

The rotation of the bracket 94 is restricted by placing a rod 98 fixed to the bracket 94 on a rod 96 fixed to a shaft 96.

Note that the expander roll 78 has its eccentric shaft 7
6 is rotated at a desired angle to spread the running printing sheet 16 in the width direction and prevent the occurrence of vertical wrinkles, and as shown in FIG. Even if the shaft 76 rotates due to frictional contact with the shaft 16, only the rotation of the shaft 76 can be adjusted independently.

That is, a worm gear 104 that meshes with a worm 102 is fixed to the shaft 76, a hollow shaft 108 is protruded from a gear box 106 that encloses the worm gear 102, and the shaft 76 is inserted into the hollow shaft.

A bushing 110 is interposed between the shaft 76 and the hollow shaft 108, and the hollow shaft 108 is connected to the bracket 80.
Since the shaft 76 is tightened and fixed by
can be freely rotated with respect to the bracket 80 by the rotation of the worm 102.

Further, since the bush 110 and the shaft 76 are fixed with a sliding key, the lateral position of the expander roll can be freely determined during 3-scale printing, 4-screen printing, and 5-screen printing.

Now, since the guide roll holding device according to the present invention has the above-described configuration, by replacing plate cylinders and impression cylinders with different diameters, even if the contact portion of both cylinders moves in the vertical direction, Since the position of the guide roll can be easily and quickly followed,
Particularly when printing on a synthetic resin film, printing efficiency can be improved and ink transfer can be improved.

In addition, since the guide roll can be attached and detached,
The printing machine can be made versatile enough to print both thin and thick materials.

Furthermore, since the static electricity removing device is also movable together with the guide roll, static electricity generated on the sheet can be removed immediately after printing.

Therefore, it is possible to prevent ink transfer failure due to static electricity during printing in the next unit.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention,
FIG. 1 is a partially cutaway front view showing only the right side of one unit, FIG. 2 is a side view, and FIG. 3 is a sectional view taken along the line -- in FIG. FIG. 4 is a vertical sectional view of the static electricity eliminator. 5 to 7 show other embodiments, and FIG. 5 is the same as in FIG. 6.
FIG. 6 is a side view, and FIG. 7 is a sectional view taken along the line. 10... Guide roll, 12... Plate cylinder, 14...
... impression cylinder, 16 ... printing sheet, 18 ... shaft, 20 ... bracket, 22 ... roll body,
24...Block, 26...Frame, 28...
Screw, 34... Handle, 36... Rotating shaft, 38, 40... Bevel gear, 44... Fixing screw, 52... Bracket, 54... Static eliminator, 56... Guide roll, 68, 70... rod,
76...shaft, 78...expander roll, 80...bracket, 82,84...split mold,
86...Hinge, 88...Pin, 90...Groove, 9
2...Bar, 94...Bracket, 96,98...
Rod, 108...Hollow shaft.

Claims (1)

[Claims for Utility Model Registration] (1) On or near a plane that includes a common tangent at the contact area between the plate cylinder and the impression cylinder of a gravure printing machine, and on the discharge side of the printing sheet, the printing sheet A guide roll is rotatably provided with respect to the shaft, a screw extending vertically is rotatably provided on the vertical surface of the frame of the printing press, and above the screw is a screw for rotating the screw. A rotating shaft equipped with a handle is supported by the frame, and a bevel gear provided on the rotating shaft is meshed with a bevel gear provided at the upper end of the screw. A block is engaged so as to be slidable in the vertical direction, and a bracket for fixedly supporting the shaft is fixed to the block, and another bracket extending toward the impression cylinder and plate cylinder is fixed to the bracket or to the shaft of the guide roll. are arranged in series so that they can freely rotate within a predetermined angle, and the other bracket holds a rod-shaped static electricity remover and an auxiliary guide roll that prevents the printing sheet from coming into contact with the static electricity remover. A guide roll holding device for a gravure printing press, which allows the guide roll to move up and down in the vertical direction by rotating the screw. (2) The bracket is divided on the slope to form split molds, one split mold is fixed to the block side and the other split mold is movable, and the shaft of the guide roll is fixed to the bracket. The scope of claim for utility model registration, which comprises a tightening means for
A guide roll holding device for a gravure printing machine as described in (1). (3) The guide roll is a guide roll or an expander roll in which the roll body and the shaft are loosely fitted.Claim (1) or (2) of the utility model registration claim
A guide roll holding device for a gravure printing machine as described in 2.