JP2945348B2 - Printing press water supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply device for a printing press, in which dampening water in a watercraft is transferred to a plurality of rolls and then supplied to a plate surface of a plate cylinder by a supply roller. It removes dust and the like.

[0002]

2. Description of the Related Art In a printing press, an image is formed on a surface of a plate mounted on a peripheral surface of a plate cylinder by ink and dampening water supplied by an inking device and a water supply device. Alternatively, the image is transferred to paper passing between cylinders via a blanket cylinder and printed.

In such a printing operation, a dried film of the ink mixes with the ink and sticks to the plate surface.
Paper dust generated during cutting of the supplied paper may be scattered and adhere to the plate surface.If printing is continued as it is,
A print failure called a "hickey" occurs in which the printed portion is partially spotted. Therefore, various types of dust removing apparatuses for removing dust such as ink residue and paper dust adhering to the plate surface in order to prevent the printing trouble have been proposed.

[0004] As a conventional dust removing device, for example, a dust removing rod provided to be able to advance and retreat is inserted from between an inking device and a water supply device, and a leading doctor blade is pressed against a plate surface on a rotating plate cylinder. Removes dust by using a cloth wrapped around a drum instead of a doctor blade, and presses it against the plate to take up the dust every time dust is removed, or multiple scrapers in the width direction of the plate cylinder The scraper of the selected portion is extruded by air pressure or the like to scrape off dust attached to the plate surface.

[0005] However, in such a dust removing apparatus, every time a hitkey is generated on the printed matter, the place where the dust is attached must be searched and the dust removing rod must be moved forward and backward in a narrow work space. There was a problem that work efficiency was poor.

In view of the above, an apparatus in which the swimsuit roll is also used as a trash removal roll is disclosed in Japanese Utility Model Laid-Open No. 2-19531.
It has been proposed as. FIG. 4 schematically shows a water supply device of a printing press having a conventional dust removal device.

As shown in FIG. 4, a plate cylinder 103 having a plate 102 mounted on its peripheral surface is pivotally supported on the frame 101. The other of the plate cylinder 103 is a watercraft storing dampening water. 104 are provided. The lower portion of the water roll 105 that is rotated by a drive motor (not shown) is immersed in dampening water in the watercraft 104. The drain roll 106 is in contact with the water roll 105. Also,
A transfer roll 107 rotatably supported by the head roll 105 and a swimsuit roll 108 are respectively in contact with the water roll 105 in this order. The control device can adjust the peripheral speed of the supply roller 108 according to the peripheral speed of the plate cylinder 103.

At the time of normal printing, the rolls are rotated in the direction shown by the arrow in FIG. 4 by the drive motor, and the dampening water in the watercraft 104 is pulled up by the water roll 105 and adheres to the surface thereof. Then, the amount of adhered water is adjusted by the draining roll 106. Water adhering to the water source roll 105 is transferred to the swimsuit roll 108 via the transfer roll 107, and is supplied to the plate surface of the plate 102 by the swimsuit roll 108. At this time, the peripheral speed of the plate cylinder 103 and the
8 is the same as the peripheral speed. Then, when dust or the like adheres to the surface of the plate 102, the control device changes the peripheral speed of the supply roller 108 relative to the peripheral speed of the plate cylinder 103. Then, the peripheral surface of the supply roll 108 and the surface of the plate cylinder 103 slide, and dust and the like attached to the surface of the plate 102 are removed.

[0009]

In the water supply device for a printing press having the above-described conventional dust removing device, the swimsuit roll 108 is driven to rotate to supply water to the plate 102. In order to remove dust and the like adhering to the roller, the supply roller 108 is rotated. Therefore, the vibration of the drive system causes the supply swimsuit roll 108 and plate 1
There is a problem that printing troubles such as a water grain and a gear grain may occur. Further, in this conventional dust removing apparatus, dust and the like attached to the surface of the plate 102 are removed by the swimsuit roll 108,
There is a possibility that dust or the like adheres to the swimsuit roll 108, the amount of water supplied changes only at that portion, and printing trouble occurs.

An object of the present invention is to provide a water supply device for a printing press, in which printing failure due to work for removing dust from a printing plate is prevented to improve the reliability of the device. And

[0011]

According to the present invention, there is provided a printing press water supply apparatus for transferring a dampening solution to a group of rolls and then supplying the dampening solution to a plate surface of a plate cylinder by a swimsuit roll. In the water supply device, a foreign matter removing roll that is driven and rotated at a peripheral speed different from the peripheral speed of the plate cylinder is provided in contact with the plate cylinder on the upstream side in the rotation direction of the plate cylinder from the water supply swimsuit roll , The foreign material removal roll is
Rolls on the upstream side of the roller group from the swimsuit roll
It is characterized by touching .

Therefore, at the time of printing, the foreign matter removing roll is in contact with the plate cylinder at a position on the upstream side in the rotation direction of the plate cylinder with respect to the supply roller, and is driven to rotate at a peripheral speed different from that of the plate cylinder. The peripheral surface of the foreign matter removing roll and the surface of the plate cylinder slide, and dust and the like attached to the surface of the plate are removed by the foreign matter removing roll. It does not enter.

The water supply device for a printing press according to the present invention is a water supply device for a printing press, in which dampening water is transferred to a group of rolls and then supplied to the plate surface of the plate cylinder by a swimsuit roll. A foreign matter removing roll that can be driven and rotated at different peripheral speeds, by using the plate cylinder and one of the rolls in the roll group .
It is characterized in that it is movable between a position where it is in contact with and a position where it is separated from both .

Therefore, during normal printing, the foreign matter removing roll is moved to a position away from the plate cylinder, and the dampening solution is transferred to the group of rolls and then reliably supplied to the plate surface of the plate cylinder by the supply swim roll. On the other hand, when removing dust or the like adhering to the surface of the plate, the foreign matter removing roll is moved to a position in contact with the plate cylinder and one of the rolls. At this time, since the foreign matter removing roll is rotationally driven at a peripheral speed different from that of the plate cylinder, the peripheral surface of the foreign matter removing roll and the surface of the plate cylinder slide, and dust attached to the surface of the plate is removed. .

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an outline of a water supply device of a printing press according to an embodiment of the present invention, FIG. 2 shows an outline of a water supply device of the printing press during normal printing, and FIG. An outline is shown.

In the water supply device for a printing press according to the present embodiment,
As shown in FIG. 1, a frame 1 (not shown)
The plate cylinder 12 on which the plate cylinder 1 is mounted is pivotally supported.
A watercraft 13 in which dampening water is stored is disposed on the other of the two. The lower part of the water roll 14, which is rotated by a drive motor (not shown), is immersed in dampening water in the watercraft 13. In addition, a metering roll 15, a water supply swing roll 16, and a swimsuit roll 17, which are rotatably supported, are sequentially in contact with the water source roll 14, respectively. And
The swimsuit roll 17 is in contact with the plate cylinder 12. In addition, in FIG.
Reference numerals 0, 21 and 22 denote ink-applying rolls, and reference numeral 23 denotes a blanket cylinder.

Below the water supply roll 16 adjacent to the plate cylinder 12, that is, upstream of the plate cylinder 12 in the rotational direction, the plate 11
Dust removal roll 31 for removing dust attached to the surface of
Are arranged. One end of the dust removing roll 31 is rotatably supported by the other end of an operating lever 33 pivotally supported by a fulcrum 32. The operating lever 33 is connected to the tip of a driving rod 35 of an air cylinder 34. . Therefore, the dust removing roll 31 is separated from the plate cylinder 12 and the water supply swing roll 16 by a driving of the air cylinder 34 (the position indicated by a two-dot chain line in FIG. 1). The position (position indicated by a solid line in FIG. 1) can be moved.

As shown in FIG. 3, a gear 36 having a pitch circle diameter d ₁ larger than the roll diameter D ₁ is fixed to the feed water swing roll 16, while a roll diameter D ₂ is fixed to the dust removal roll 31. A gear 37 having a smaller pitch circle diameter d ₂ is fixed. The gears 36 and 37 are always in mesh with each other. Therefore, the driving force of the feed water swinging roll 16 is transmitted to the dust removing roll 31 via the gears 36 and 37, and the dust removing roll 31 is rotated. Are different. Therefore, a slip occurs when the rolls 16 and 31 are in contact with each other, and the peripheral speed slip ratio can be represented by 1- (D ₁ · d ₂ ) / (d ₁ · D ₂ ). Since the water supply swing roll 16, the water supply swim roll 17, and the plate cylinder 12 are driven by a nip, the peripheral speeds of the rolls 16, 17, and 12 are the same.
The peripheral speeds of the dust removing roll 31 and the plate cylinder 12 are different, and a slip occurs between the rolls 31 and 12 even when the rolls 31 and 12 are in contact with each other.

When a motor (not shown) is driven during normal printing by the printing press, the plate cylinder 12 and the blanket cylinder 23, the ink wiping rolls 18, 19, and the ink applying rolls 20, 2 are provided.
Each of the printing cylinders 1, 2 and 22 (not shown) rotates. Also,
With the rotation of these cylinders, the water roll 1
4. The metering roll 15, the water supply swing roll 16, and the swimsuit roll 17 rotate respectively. At this time, the air cylinder 3
4 is not operating, and the dust removing roll 31 is located at a position separated from the plate cylinder 12 as shown by a solid line in FIG. The rotation direction of each cylinder and each roll is the direction indicated by the arrow in the figure. Accordingly, the dampening water in the watercraft 13 is pulled up by the rotating water roll 14 and adheres to the surface thereof, the amount of the adhering water is adjusted by the metering roll 15 and transferred to the water supply swinging roll 16 and then transferred to the water supply swimsuit. It is supplied to the plate surface of the plate 11 of the plate cylinder 12 by the roll 17.

At this time, the dust removing roll 31
As shown in FIG. 2, the plate cylinder 12 and the water feed swing roll 1
6, the gear 37 integral with the dust removal roll 31 meshes with the gear 36 of the water supply swing roll 16. Accordingly, although the peripheral speeds of the dust removal roll 31 and the feed water swing roll 16 are different from each other, the nip is in a detached state, so that even if the dust removal roll 31 continues to rotate for a long time, the plate cylinder 12 and the water feed swing roll 16 cannot rotate. There is no wear on the surface.

On the other hand, when dust such as ink residue or paper dust adheres to the surface of the plate 11, the air cylinder 34 is driven, the drive rod 35 is extended, and the operation lever 33 is rotated to thereby rotate the dust removal roll 31. Is moved to a position in contact with the plate cylinder 12 and the water supply swing roll 16 as shown by a two-dot chain line in FIG. At this time, the dust removing roll 31 has the gear 37 meshed with the gear 36 of the water supply swing roll 16, the nip is in the worn state, and the peripheral speeds are different from each other. Further, the nip of the dust removing roll 31 is also attached to the plate cylinder 12, and their peripheral speeds are different. Therefore, the surface of the dust removal roll 31 slips between the plate cylinder 12 and the peripheral surface of the water supply swinging roll 16, and the dust adhered to the peripheral surface of the plate 11 contacts the plate 11 with the supply swimsuit roll 17. Before entering the portion, the dust is removed by a dust removing roll 31, and the removed dust is removed by a water supply swing roll 16, transferred to the metering roll 15 and the water roll 14, and removed to the watercraft 13.

As described above, in the water supply device of the present embodiment, the dust removing roll 31 that is driven and rotated at a peripheral speed different from the peripheral speed of the plate cylinder 12 is provided to the plate cylinder 12 more than the swimsuit roll 17.
Is provided so as to be in contact with the plate cylinder 12 on the upstream side in the rotation direction of the plate 11 so that the peripheral surface of the dust removal roll 31 and the plate 11 of the plate cylinder 12 slide, and dust attached to the surface of the plate 11 31 is removed and does not enter between the surface of the plate 11 and the peripheral surface of the feeding roller 17 and printing trouble is prevented. In addition, when removing dust such as ink residue and paper dust attached to the surface of the plate 11, the air cylinder 34 may be operated from a remote position, which facilitates the dust removal operation. Since the plate cylinder 12 (plate 11) is nip-fitted over the entire width of the plate 11, it is not necessary to check the position where dust is generated, and the work can be performed quickly and in a short time.

Also, in the water supply device of the present embodiment,
Only when the dust on the surface of the plate 11 is removed, the dust removing roll 31 having a peripheral speed different from that of the plate cylinder 12 and the water supply swing roll 16.
Is brought into contact with the peripheral surfaces of the plate cylinder 12 and the water supply roll 16, thereby causing slippage between the two and removing dust. Therefore, the dust removing roll 31 and the plate cylinder 1
2 and the water supply swing roll 16 can be minimized to reduce the wear on each other's surface. Since the dust removal roll 31 is brought into contact with the water supply swing roll 16 in front of the swimsuit roll 17, the dust is removed from the generation of dust on the plate 11, and the density of the printed matter until the final printing is stabilized. As a result, loss of paper due to test printing or the like can be reduced.

Further, the plate cylinder 12 is generally provided with a holding portion for fixing the plate 11. When the supply roller 17 supplies water to the plate 11 of the plate cylinder 12, the holding portion is provided. Does not contact the plate 11, so that a part of the water film on the peripheral surface of the supply roll 17 corresponding to the holding portion becomes thicker,
This thick water film transfers to the plate 11. However, since the dust removing rolls 31 having different peripheral speeds are in contact with the plate cylinder 12 on the upstream side of the plate cylinder 12, by removing an excess water film attached to the plate cylinder 12, the partial density is reduced. The change in the difference is eliminated, and printing trouble is prevented.

In the above-described embodiment, the dust removing roll 3 for contacting the plate cylinder 12 when removing dust is used.
Although the movement of 1 is configured to be performed by the operating lever 33 and the air cylinder 34, the water supply device of the present invention is not limited to this configuration. You may use it. Further, the dust removing roll 31 is brought into contact with the feed water swing roll 16 and the driving rotational force thereof is obtained from the feed water swing roll 16, but this may be the metering roll 15 or the like. A dedicated drive motor may be provided. Further, the gear 37 of the dust removing roll 31 is always meshed with the gear 36 of the water supply swing roll 16, but this is for improving the meshing property of the dust removing roll 31 at the time of movement. At the time of use, the engagement between them may be released.

[0027]

As described in detail in the above embodiment, according to the water supply device of the printing press of the present invention, the dampening solution is transferred to the roll group, and then supplied to the plate surface of the plate cylinder by the swimsuit supply roll. In the water supply device of the machine, a foreign matter removing roll that is driven and rotated at a peripheral speed different from the peripheral speed of the plate cylinder is provided on the upstream side in the rotation direction of the plate cylinder relative to the swimsuit roll in contact with the plate cylinder, and the foreign matter removing roll is provided . Swimsuit low when removing foreign matter
In contact with the roll on the upstream side of the water supply in the roller group arrangement
As a result , the foreign material removing roll has its peripheral surface slipped between the surface of the plate cylinder and dust and the like attached to the surface of the plate are removed by the foreign material removing roll before reaching the supply roll. There is no dust or dirt entering between the surface of the plate cylinder and the peripheral surface of the swimsuit roll, preventing the occurrence of printing troubles and ensuring the removal of dust from the plate surface to improve the reliability of the device. Can be.

According to the water supply device for a printing press of the present invention, in the water supply device for a printing press, the dampening solution is transferred to a group of rolls and then supplied to the plate surface of the plate cylinder by a swimsuit roll.
The foreign matter removing roll, which can be driven and rotated at a peripheral speed different from the peripheral speed of the plate cylinder , can be freely moved between a position in contact with both the plate cylinder and one of the rolls and a position apart from the same. Therefore, the foreign matter removing roll is separate from the dampening solution supply path and separates from the plate cylinder during normal printing, so that the vibration of the drive system does not affect the swimsuit roll and the plate, etc. The generation of dust is prevented, and the work of removing dust from the plate surface can be reliably performed, so that the reliability of the apparatus can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a water supply device of a printing press according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a water supply device of a printing press during normal printing.

FIG. 3 is a schematic diagram of a water supply device of the printing press at the time of dust removal.

FIG. 4 is a schematic view of a water supply device of a printing press having a conventional dust removal device.

[Explanation of symbols]

 11 plate 12 plate cylinder 13 water boat 14 water roll 16 water supply swing roll 17 swimsuit roll 31 dust removal roll (foreign matter removal roll) 33 operating lever 34 air cylinder 36, 37 gear

Claims (2)

(57) [Claims] 1. A foreign matter removing roll driven and rotated at a peripheral speed different from a peripheral speed of a plate cylinder in a water supply device of a printing press for supplying dampening water to a roll group and then supplying the plate surface of the plate cylinder by a swimsuit roll. Is provided on the upstream side in the rotation direction of the plate cylinder relative to the supply roller, in contact with the plate cylinder ,
The material removal roll is located before the swimsuit roll when removing foreign matter.
A water supply device for a printing press, wherein the water supply device is in contact with a roll on an upstream side of water supply in an arrangement of the roller group . 2. A water supply device for a printing press, wherein a dampening solution is transferred to a group of rolls and then supplied to a plate surface of a plate cylinder by a swimsuit roll, wherein a foreign matter driven and rotatable at a peripheral speed different from the peripheral speed of the plate cylinder is removed. A water supply device for a printing press, wherein a roll is freely movable between a position at which the roll is in contact with and a position at which the roll is separated from both of the plate cylinder and one of the rolls.