JP2003266634A - Powder spray scattering prevention device - Google Patents

Abstract

(57) [Problem] In a delivery section of a sheet-fed printing press, powder to be sprayed in a delivery section in order to prevent set-off of printed paper before sequentially loading printed paper on a paper stacking board. To provide a powder spray scattering prevention device that shields and protects powder and minimizes the amount of powder. In a powder spraying apparatus for spraying, a powder for preventing set-off from a powder spray nozzle on a surface of a printed paper, the powder for preventing set-off from the powder spray nozzle is shielded and printed. The powder is spread evenly in a band.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a delivery section of a sheet-fed printing press, in which a powder for preventing set-off of the printed paper in the delivery section before the printed sheets are sequentially stacked on the stacker. The present invention relates to a powder spray scattering prevention device for a sheet-fed printing machine.

[0002]

2. Description of the Related Art Generally, in a delivery unit of a sheet-fed printing press, printed papers are stacked one by one, and the stacked papers are stacked so that the first stacked papers are sequentially discharged later. The compressive load is applied by the weight of the coming paper. For this reason, a printing failure called so-called blocking occurs in which the ink of the printed paper that is stacked is transferred to the back surface of the printed paper that is stacked next.
This set-off significantly reduces the value of printed matter and is a major factor in print complaints. For this reason, the settling prevention powder is sprayed from the powder spray nozzle on the surface of the printed paper in order to improve the settling of the printed paper and the inconvenience caused by the adhesion of the paper. The anti-setoff powder is generally 70 μm or less, particularly 10 μm to 30 μm, and is atomized by a spraying device to be sprayed in a strip shape, and the powder of the printed paper conveyed in the delivery part is conveyed. Let it deposit on the surface.

As described above, the powder scattered on the surface of the printed paper is not necessary for the original printing itself, so that
It is desirable to minimize the amount of powder that is sprayed onto the printed paper.

However, since the powder dispersed on the printed paper is fine particles as described above, the entire amount of the powder sprayed from the powder spray nozzle does not adhere to the printed paper, and about 2 / 3 is scattered around.

Further, as the printing speed increases, the powder spray nozzle must be sprayed in a short time, so that the powder amount and the jetting pressure also increase and the printed paper corrugates, whereby the powder particles are swirled and further scattered. It is difficult to spread the powder evenly on the printed paper and deposit it.

Further, although a dust collector is provided in the delivery section, the scattered powder is mixed with the lubricating oil in the delivery chain and the machine to deteriorate the lubrication function and deteriorate the performance of the printing machine itself. There is.

The printed paper stacked on the paper stack of the delivery section of the sheet-fed printing press has a larger compressive load as the printed paper stacked underneath, and has a greater compressive load as the printed paper stacked above. Since the load is small, set-off is more likely to occur in the printed paper stacked below, and the amount of powder to be sprayed is kept to be adjusted according to the sprayed amount of the printed paper below. Because of this, the upper printed paper is sprinkled with excess powder.

Further, the width of the powder to be sprayed in the sheet-fed printing machine to prevent set-off is matched with the maximum printing width dimension of the sheet-fed printing machine, and the powder is spread on the surface of the printed paper being conveyed in the delivery section. It is given to be done.

For this reason, when the width of the printed paper is narrow, the powder outside the printed paper width region excessively floats in the delivery section and adheres to the devices and devices to print the paper being conveyed in the delivery section. The image is spilled and the quality of the printed matter deteriorates.

Further, in order to prevent the powder and the like adhering to the apparatus and devices from being dropped on the printed paper which is being conveyed in the delivery section, the printing machine is stopped for a long time and cleaned. If the utilization rate of the is extremely low, a big problem will occur.

Therefore, the powder sprayed from the powder spray nozzle is efficiently and uniformly deposited on the printed paper as much as possible, and the inconvenient powder is deposited on the printing machine and the function of the machine is deteriorated. To avoid it, the Federal Republic of Germany utility model registration application publication No. 29517283U1
Japanese Patent Publication No. 2001-523605 and Japanese Patent Publication No. 2001-512.
In addition to a powder nozzle or a powder spraying device for reducing the scattering of settling prevention powder, there is a method of magnetizing fine particles of powder to recover an inconvenient powder by using a magnetic field. Special table 2
No. 000-517259.

However, the method of magnetizing powder fine particles to utilize a magnetic field is expensive in terms of equipment cost and adversely affects the equipment, and in addition, a magnetic field generating member or the like is generated by a lateral flow of printed paper conveyed by a gripper. It is difficult to evenly disperse the paper, as it is damaged by contact with the paper printed on the paper.
Another proposal is that air and powder are layered and directed toward the surface of the printed paper as an air impact flow, so the printed paper hinders the conveyance by the gripper nails, and the waviness phenomenon occurs and the powder is evenly swirled. No spraying is desired and undesired powder splattering is not reduced. Further, it is known that the scattered powder is captured by providing a guide plate or a suction device in the delivery section. This kind of means is expensive, but the powder capturing effect is low.

[0013]

SUMMARY OF THE INVENTION The present invention focuses on the above-mentioned conventional problems and is applied to prevent set-off of printed paper stacked on a paper stack plate of a delivery section of a sheet-fed printing press. To prevent the powder from scattering, the powder is scattered almost vertically to the printed paper in a belt shape that is not an impact flow, is covered and protected by the air spray nozzle and is evenly distributed, and the powder adhesion rate is improved, and the powder is scattered. It is possible to prevent the deterioration of the performance of the printing machine and the like, and to reduce the number of times the printing machine is stopped and cleaned dramatically, which improves the operating rate of the printing machine and the quality of the printed matter. An object is to provide a spray splattering prevention device.

[0014]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to a first aspect of the present invention in which a printed sheet discharged from an impression cylinder at the end of a printing unit is delivered to a delivery section. In the delivery section of a sheet-fed printing machine that transfers and stacks the sheet paper to the sheet pile section by an endless chain, the printed sheet is conveyed to the sheet pile section.Powder for preventing settling of the printed matter on the surface of the printed sheet A spray dispersal device, which sprays powder onto the printed paper conveyed into the device, and the powder spray nozzle to the front side and the rear side in the conveying direction of the printed paper. Equipped with an air spray nozzle for injecting air to prevent scattering of the powder sprayed from the powder spray nozzle at the corresponding location. A powder spray scattering prevention device according to claim.

Next, in the invention according to claim 2 of the present invention, the powder spray nozzle for injecting powder mixed with the above-mentioned set-off prevention air and the air spray nozzle for injecting air not containing powder are powder. The powder spray scattering prevention device according to claim 1, wherein one or more spray nozzles are provided in front of and behind the spray nozzle, respectively.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A powder spray scattering prevention device of the present invention will be described in detail below with reference to the drawings along with embodiments. FIG. 1 is a configuration diagram showing a schematic configuration of a delivery unit of a sheet-fed printing machine equipped with a powder spray scattering prevention apparatus according to an example of the present invention, and FIG. 2 is a sheet-fed printing machine according to an example of the present invention. FIG. 4 is a block diagram showing the configuration of the powder spray scattering prevention device, FIG. 3 is a plan view of the powder spray scattering prevention device attached to the delivery portion of the sheet-fed printing press according to one embodiment of the present invention, and FIG. FIG. 5 is a front view showing the arrangement and formation of the powder spray nozzle and the air spray nozzle of the powder spray scattering prevention device of the sheet-fed printing press according to one embodiment of the invention, and FIG. The front view of the air spray nozzle of the powder spray scattering prevention device, FIG. 6 is a cross-sectional view of the air spray nozzle of the powder spray nozzle scattering prevention device of the sheet-fed printing press according to one embodiment of the present invention,

FIG. 1 is a schematic diagram showing the construction of a delivery section 1 of a sheet-fed printing press equipped with a powder spray scattering prevention device 20 according to the present invention, with reference to FIG. The delivery unit 1 is located at the final stage of a sheet-fed printing machine (not shown), and is provided at a position for transferring the printed paper 3 discharged from the impression cylinder 2 of the final printing unit to the sheet pile unit 5. The delivery part 1 is surrounded by a delivery frame 10 formed so as to surround a conveying path from the impression cylinder 2 to the sheet pile part, but is printed on the upper surface part of the sheet pile part 5 from the lower impression cylinder 2. In order to transfer the paper 3, the gripping claws 7 are horizontally mounted on the pair of left and right endless chains 6 arranged along the transport direction, and the gripping claws 7 are arranged at regular intervals to grip the tip of the printed paper 3. I try to carry it. The endless chain 6 is wound around a pair of left and right transfer sprockets 8 rollingly contacting the impression cylinder 2.
The paper 3 on which the gripper 7 moving along with the orbiting movement of the paper 3 is conveyed to the sheet pile portion 5, and the release action of the gripper 7 causes the paper 3 printed on the paper stack plate 11 of the sheet pile portion 5 to be printed. It is stacked on the uppermost surface of the stacked and sequentially printed papers 3. Due to the sheet piling, the lower side of the revolving endless chain 6 is fed and conveyed as an outward path, and the upper side of the chain is returned as a return path to return the gripper 7 to the transfer sprocket 8 side.

When the gripper claw 7 of the endless chain 6 is opened by the cam 9a at a position facing the impression cylinder 2 and the printed paper 3 is delivered to and from the impression cylinder 2, the gripper claw 7 is moved to the cam 9b. Then, the printed paper 3 is closed and is conveyed by the endless chain 6 to the sheet pile unit 5.

Further, the paper pile plate 11 of the sheet piling section 5
The gripper 7 is opened by the cam 9c to release the pinching of the printed paper 3. The paper 3 printed by the release of the pinching is stacked on the stacking plate 11 and can be moved up and down on the stacking table 12. It is stacked on the stack plate 11.

At the same time as the printed papers 3 are stacked on the paper stacking plate 11 and sequentially stacked on the uppermost surface, the paper stacking table 12 which can be raised and lowered is lowered and the height of the uppermost surface on the endless chain 6 and the paper stacking plate 11 is lowered. Are always held in place.

A powder spray nozzle in which powder mixed with air from the settling prevention powder is applied to the printed paper 3 being conveyed in the delivery section 1 from the powder spray scattering device. 14, an air spray nozzle 18,
It is jetted with 19 powderless air.
The powder spray splattering preventive device 20 is arranged along the width direction of the printed paper 3 in the course of the conveyance of the printed paper 3 and is atomized downward from the upper position of the conveyance surface. Scatter the powder particles into a strip.

The printed paper 3 is conveyed to the sheet pile section 5 by the gripper 7 on the endless chain 6 in the forward path, so that the printed paper 3 is not damaged during the conveyance. The transport guide plate 13 or the sheet guide plate 16
And so on.

The powder sprayed from the powder spray nozzle 14 to prevent set-off is generally starch or talc, which is a fine powder having a particle size of 70 μm or less, particularly 10 μm to 30 μm.

The powder sprayed from the powder spray nozzle conveys the powder mixed with the air from the powder spray spraying device 15 through the powder blower pipe 22 and is ejected from the powder spray nozzle 14.

Further, the air sprayed from the air spray nozzles 18 and 19 which is not mixed with the powder is supplied from the blower 17 provided in the printing machine to the air blowing hose 21.
Is blown to the air spray nozzles 18 and 19.

Next, the structure of the powder spray scattering prevention apparatus 20 of the sheet-fed printing press according to the present invention will be described with reference to FIG. The operation unit 23 controls the paper quality, paper size,
Input is made including paper conditions such as paper weight, printing patterns, printing density, printing speed, printing conditions such as ink type, and parameter settings such as the amount of spraying. Control unit 2
A designation signal including these parameters is displayed on the operation unit 23.
In addition to being input from the printer, a printing operation signal, a powder spraying timing signal and the like are input from the printing machine.

The powder spraying timing signal is a spraying start signal when the paper 3 printed by the delivery unit 1 is conveyed by the endless chain 6 and the end of the end of the paper 3 printed by the powder spray scattering prevention device reaches. The powder mixed with air from the powder spray nozzle 14 is sprayed in a band shape on the printed paper 3 which is shielded and protected by the air sprayed from the air spray nozzles 18 and 19, and when the trailing end of the printed paper 3 reaches the end. A spray stop signal to stop the injection is obtained.

The powder supply device 15 has a powder storage tank 27 for storing powder and a powder tank 25 below the storage tank 27. In addition to signals such as the powder amount, the powder spraying timing, and the air volume, the powder is supplied from the control unit. A powder amount adjusting dial 26 that can independently adjust the powder amount and the like is provided in the supply device 15. The powder tank 2 is controlled by a signal from the control unit 24 or the powder amount adjusting dial 26 unique to the powder supply device 15.
The powder mixed with the air supplied from the blower 17 to the powder 5 and mixed with the air atomized by the powder blower pipe 22 is conveyed to the powder spray nozzle 14.

Next, referring to FIG. 3, the powder spray nozzle 14 and the air spray nozzles 18 and 1 in the powder spray scattering prevention device 20 of the sheet-fed printing press according to the present invention.
9 formation will be described. The powder spray scattering prevention device 20 sprays the powder mixed with the air, and the air sprayed from the powder spray nozzle 14 and the air sprayed from the powder spray nozzle 14. It consists of spray nozzles 18, 19.

An air spray nozzle 1 for injecting unmixed air in front of and behind the powder spray nozzle 14 for spraying powder mixed with air to shield and protect the powder mixed with air.
8 and 19 are provided.

In the powder spray nozzle 14, powder mixed with air from the powder spray device 15 is connected by a powder blow pipe 22, and a powder mixed with air is sprayed from the powder spray nozzle 14 in response to a signal from the control unit 24. In addition, the air spray nozzles 18 and 19 for spraying the air mixed with the air sprayed from the powder spray nozzle to shield and protect the powder mixed with the air are blown from the blower 17 to the air blower pipe 2.
1 is connected to the L-shaped vinyl pipe joint, and air free from powder is jetted from the air spray nozzles 18 and 19 in response to a signal from the control unit 24.

Next, referring to FIG. 4, the powder mixed with the air sprayed from the powder spray nozzle 14 of the powder spray scattering prevention device 20 of the sheet-fed printing press according to the present invention is the powder of the air spray nozzles 18 and 19. The formation that is shielded and protected by the air that is not mixed will be described. The spray holes of the powder spray nozzle 14 and the air spray nozzles 18 and 19 are provided facing the surface of the printed paper 3. As a powder spray spraying device for spraying powder mixed with air, a widely used device can be used. The spray holes of the powder spray nozzle 14 are applied almost vertically to the printed paper 3 to disperse the powder mixed with air.

Further, the air spray nozzles 18 and 19 for shielding and protecting the scattered powder in a strip shape are attached to the individual air blowing members 30, and the jet direction of the air spray nozzle 18 is conveyed to the printed paper. It is set to incline about 10 ° to 25 ° in the direction of the powder spray nozzle 14 with respect to a perpendicular assumed to the three surfaces,
Further, the spray direction of the air spray nozzle 19 is set so as to be inclined in the opposite direction to the powder spray nozzle 14 by about 10 ° to 25 °.
A plurality of 19 are also provided in the paper width direction of the printed paper 3, so that the scattered powder can be prevented from scattering and the scattered powder can be efficiently deposited on the printed paper 3.

Further, the timing of spraying from the powder spray nozzle 14 and the air spray nozzles 18 and 19 is such that the printed paper 3 is conveyed by the endless chain 6 and the end of the printed paper 3 is a device for preventing scattering of the powder spray. When it reaches 20, the injection is started by the signal from the control unit, the powder mixed with the air is ejected from the powder spray nozzle 14, and at the same time, the air spray nozzles 18, 19
When non-powdered air is ejected from the end and the trailing edge of the printed paper 3 reaches the end, all ejection is stopped by the ejection stop signal.

Next, the construction of the air spray nozzles 18, 19 of the powder spray scattering prevention apparatus 20 for sheet-fed printing according to the present invention will be described with reference to FIG. The air spray nozzles 18 and 19 are joined together with the powder spray nozzle 14 to a mounting bracket 28 provided on the delivery frame 10 by air blower pipe brackets 29 at both ends of the air blower pipe member 30. The cross section of the air blower pipe member 30 has a tubular structure, and the L-shaped hose pipe joint 26 is provided on the upper surfaces of both ends.
However, ten air spray nozzle bodies 31 for injecting air are provided on the lower surface. The L-shaped hose pipe joints 26 at both ends are joined to the air blower pipe 21 that sends the air from the blower 17 to the air blower pipe member 30, and the air without the powder is jetted from the air spray nozzles 18 and 19.

The air spray nozzle body 31 provided on the lower surface of the air blower pipe member 30 is formed in a staggered shape with the powder spray nozzle body 32 to shield and protect the powder mixed with air from the powder spray nozzle body 32. There is.

Next, the structure of the air spray nozzle main body 31 of the powder spray scattering prevention apparatus 20 of the sheet-fed printing press according to the present invention will be described with reference to FIG. The air spray nozzle body 31 includes a nozzle cap 34 for sealing the cavity, a nozzle packing 35 for preventing air from leaking from the air blower pipe member 30, and a joint packing 3.
6 and a joint nut 36 for joining the air spray nozzle body 31 to the air blower pipe member 30. A vent hole 38 is formed in a central portion of the air spray nozzle main body 31 which is fitted into the air blower pipe member 30 to inject the powder-free air of the air blower pipe member 30 from the injection hole. . The size of the vent hole 38 is about 8.0 to 12 mm in diameter, but it is preferable that it is as large as possible.

Further, the injection holes 33 of the air spray nozzle body 31 have a diameter of 0.5 to 1.0 mm at intervals of 1.0 to 4.0 mm along the central circumference of the height of the air spray nozzle body 31. Three to six injection holes of about 0 mm are provided, and the air sprayed from the air spray nozzle body 31 is jetted in layers.

[0039]

According to the present invention, the powder mixed with the air sprayed from the powder spray nozzle on the printed paper surface is shielded and protected by the non-powdered air and is sprayed in the form of a strip, so that the powder is lost. The powder is sprayed evenly and uniformly. In addition, it is possible to prevent the machine from malfunctioning due to the powder being mixed in the lubricating oil of the printing machine due to the scattering of powder, and the number of cleanings can be reduced, which improves the machine operating efficiency and improves the printing quality due to dripping. It can be prevented from falling.

[Brief description of drawings]

FIG. 1 is a configuration diagram illustrating a schematic configuration of a delivery unit including a powder spray scattering prevention device of a sheet-fed printing press according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a powder spray scattering prevention device of a sheet-fed printing press according to an embodiment of the present invention.

FIG. 3 is a plan view showing formation of a powder spray scattering prevention device of a sheet-fed printing press according to an embodiment of the present invention.

FIG. 4 is a front view showing formation of a powder spray nozzle and an air spray nozzle of a powder spray scattering prevention device of a sheet-fed printing press according to an embodiment of the present invention.

FIG. 5 is a front view of an air spray nozzle of a powder spray scattering prevention device of a sheet-fed printing press according to an embodiment of the present invention.

FIG. 6 is an air spray nozzle AA ′ of a powder spray scattering prevention device of a sheet-fed printing press according to an embodiment of the present invention.
FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Delivery part 2 ... Impression cylinder (printing unit) 3 ... Printed paper 4 ... Reverse sprocket 5 ... Sheet pile part 6 ... Endless chain 7 ... Holding claw 8 ... Transfer sprocket 9a ... Holding claw opening / closing cam (opening side) 9b ... Claw for opening and closing the gripper jaw (closer side) 9c ... Cam for opening and closing the gripper jaw (opening side) 10 ... Delivery frame 11 ... Paper stacking plate 12 ... Paper stacking table 13 ... Conveying guide plate 14 ... Powder spray nozzle 15 ... Powder spray Spreading device 16 ... Sheet guide plate 17 ... Blower 18 ... Air spray nozzle 19 ... Air spray nozzle 20 ... Powder spray scattering prevention 21 ... Air blow hose stop device 22 ... Powder blow pipe 23 ... Operation part 24 ... Control part 25 ... Powder Tank 26 ... Powder amount adjustment dial 27 ... Powder storage tank 28 ... Mounting bracket 29 ... Blower tube Bracket 30 ... Air blower pipe member 31 ... Air spray nozzle 32 ... Powder spray nozzle main body 33 ... Injection hole 34 ... Nozzle cap 35 ... Nozzle packing 36 ... Joint nut 37 ... Joint packing 38 ... Vent 39 ... Hollow part

Claims (2)

[Claims] 1. A printed sheet discharged from an impression cylinder at the end of a printing unit is transferred by a delivery section endless chain to a sheet pile section for stacking, and the printed sheet is sheeted at a delivery section. A powder spray spraying device for preventing the settling of printed matter on the surface of the printed paper conveyed to the pile part, and a powder spray nozzle for injecting powder onto the printed paper conveyed into the device. And, to this powder spray nozzle, an air spray nozzle that sprays air to prevent the powder sprayed from the powder spray nozzle from scattering at the front and rear sides of the printed paper conveyance direction. A powder spray splattering prevention device, characterized by comprising: 2. A powder spray nozzle for injecting a powder mixed with the air for preventing set-off and an air spray nozzle for injecting air not containing the powder are arranged substantially in parallel in front of and behind the powder spray nozzle. The powder spray scattering prevention device according to claim 1, wherein the device is applied to the powder spray scattering prevention device.