JPH08295007A - Dust collector of delivery part on leaf printer - Google Patents

Abstract

PURPOSE: To obtain a dust collector which is capable of collecting dust effectively by improving the efficiency of powder sticking to a printing sheet to be transported at the time of collecting floating dust of a blocking preventive powder in the delivery part of a printer. CONSTITUTION: This dust collector serves for the delivery part of a leaf printer over which a blocking preventive powder is spread. A cover 44 which extends across the air exhaust side of a fan 42 for causing a printing sheet to be transported, to stick to a transported printing sheet guide plate arranged in a leaf transport path, is provided on the guide plate. In addition, a fan 50 which aspirates an air in the cover is arranged in an aspiration passage (aspiration duct 48) connected to the cover. Further, a filter 54 is arranged halfway through a path which aspirates the air in the cover, and a cyclone dust collection means 52 is provided in the upstream aspiration side of the filter. A filter 54a is likewise arranged in a path leading to an aspiration means 50 connected to the suction roller 34 of the delivery part so that the aspiration means 50 is sucked to the suction roller 34. At the same time, the cyclone dust collection means 52a is provided in the upstream aspiration side of the filter 54a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collector for a delivery section of a sheet-fed printing press, and is particularly suitable for application to a delivery section in which powder for preventing blocking of printing paper is sprinkled in the delivery section. The present invention relates to a dust collector for a delivery unit of a sheet-fed printing press.

[0002]

2. Description of the Related Art Generally, in a sheet-fed printing press, a paper after printing is conveyed to a delivery portion, and an anti-blocking powder is sprinkled on the paper to improve the problems caused by show-through and adhesion of the paper. It has become. This anti-blocking powder is generally 70 μm or less, especially 10 to 3
The powder is in the range of 0 μm, and is made into an atomized state by a spraying device and sprayed so that the powder adheres to the surface of the printing paper being conveyed in the delivery section. If such anti-blocking powder floats in the delivery housing, it will adhere to the equipment and cause problems such as dripping onto the conveyed printing paper.Therefore, a dust collector has been conventionally installed in this printing machine delivery section. Has been done.

In the conventional dust collector, a suction hood is attached to the upper cover of the delivery section housing, the air in the housing is sucked together with the floating blocking blocking powder through a suction passage connected to the hood, and the powder is collected by a filter. I am trying to do it.

[0004]

However, in the conventional dust collector, the capacity of the delivery portion housing is large, and the front surface of the housing facing the seat piling device is also opened, which contributes to the dust collection. There is a problem that the effect is low, and there is a drawback that the suction and dust collecting device becomes large in size as a countermeasure. Actually, if the dust collection function is increased by increasing the size of the dust collecting device, the scattered blocking prevention powder will not adhere to the transport printing paper and the original purpose cannot be achieved, so there is a limit to the size increase of the device. It has to be used in a state where the dust effect is low. Therefore, a suction device such as a suction roll that sucks the conveyed printing paper in the delivery unit sucks the powder, and the filters attached to these suction devices can be clogged early and the filter replacement can be accelerated. there were.

In view of the above-mentioned conventional problems, the present invention collects excess floating powder that has not adhered to the conveyed printing paper by spraying the blocking prevention powder in the delivery section of the printing machine and collects dust inside the delivery section. Provides a dust collector for the delivery section of the sheet-fed printing press that improves the efficiency of powder adhesion to the transport printing paper and at the same time can effectively collect dust and does not increase the equipment for dust collection. The purpose is to do.

[0006]

In order to achieve the above object, a dust collecting apparatus for a delivery section of a sheet-fed printing press according to the present invention comprises:
A dust collector in the delivery section of a sheet-fed printing press to which blocking-preventing powder is sprayed, and the exhaust side of a suction fan that adsorbs the conveyed printing paper to a sheet-conveyed printing paper guide plate that is arranged in the sheet-conveying path. And a suction means for sucking the air in the cover is arranged in a suction passage connected to the cover, and a cyclone-type dust collecting means is provided in the middle of the path leading to the air suction means in the cover. It is a feature. In this case, a filter can be arranged on the downstream side of the cyclone type dust collecting means.

Further, a dust collector of a delivery section of a sheet-fed printing press according to another structure of the present invention is a dust-collection apparatus in a delivery section of a sheet-fed printing machine in which blocking prevention powder is sprayed. The present invention is characterized in that a cyclone-type dust collecting means is provided in the middle of a path from the suction section for sucking the conveyed printing paper to the suction means on the conveying line surface arranged on the conveying path.

Also in this case, a filter can be arranged on the downstream side of the cyclone type dust collecting means. Further, the conveyed printing paper suction unit is a curl removing device (hereinafter referred to as a sheet decurler) or a suction roller, and the cyclone type dust collecting means is arranged in each of these suction passages, or a filter is arranged downstream thereof. It is possible to use this suction effect to collect dust.

[0009]

According to the above construction, the printing paper flows along the carrying line in the delivery section, but it is installed on the carrying line to correct the curl of the carrying printing paper or to improve the carrying speed for piling. A suction unit is provided so that the conveyed printing paper coincides with the conveying line in order to lower the pressure. In the path from the suction part of the suction means to the suction means such as a suction fan or a vacuum pump, the powder-containing air sucked directly from the conveyed printing paper side is introduced to the cyclone type dust collecting means in the preceding stage of the suction path. It Most of the powder as powder is removed by this cyclone type dust collecting means, and the powder directly flows to the suction means, or the air containing a trace amount of powder thereafter is introduced into the filter in the subsequent stage. As a result, the powder is almost completely collected. Since the dust collection function is installed in the suction part of the delivery printing paper provided in the delivery part, it does not modify the housing of the delivery part, and is attached to match the delivery printing paper with the delivery line in the delivery part. Since it is only provided in the suction passage of the suction means, it can be easily installed in the current device, and since it directly sucks from the conveyed printing paper side, it has the effect of attaching blocking blocking powder to the conveyed printing paper. The advantages are that the dust collection effect is improved while increasing the dust collection rate, and the filter maintenance is extended.

In order to prevent fluttering of the edges of the transported printing paper, when a suction fan is used to suck air directly onto the lower surface of the transport line, a duct is provided by providing a cover for the exhaust side. Is formed, and a suction port is provided in this cover to connect to suction means such as a suction fan or a vacuum pump,
Similarly, a cyclone-type dust collecting means alone or a filter provided subsequently to the cyclone-type dust collecting means works similarly in the path leading to the suction means.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the dust collecting device of the delivery section of the sheet-fed printing press according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view of the delivery section of a sheet-fed printing press equipped with a dust collector according to the embodiment. Delivery department 1
0 is located at the final stage of the printing machine (not shown), and is provided at a position where the printing paper 14 discharged from the impression cylinder 12 of the final printing unit is transferred to the sheet pile device 16. The delivery part 10 is surrounded by a delivery housing 18 formed so as to surround a conveying path from the impression cylinder 12 to the sheet pile device 16, but the delivery part 10 is printed on the upper surface of the sheet pile device 16 from the lower impression cylinder 12. In order to transfer the paper 14, the gripping claws 22 are horizontally mounted on the pair of left and right endless chains 20 arranged along the transporting direction, and the gripping claws 22 are arranged at regular intervals and are transported by gripping the leading end of the printing paper 14. I am trying. The endless chain 20 is wound around a transfer sprocket 24 rollingly contacted with the impression cylinder 12 and a reversing sprocket 26 arranged at the upper part of the sheet pile device 16, and moves along with the revolving movement of the endless chain 20. The claw 22 conveys the sheet of printing paper 14 to the sheet pile device 16 and is stacked on the uppermost surface of the printing paper stacked on the sheet pile device 16 by the release action of the gripper 22. An endless chain 20 that revolves due to seat piling.
The lower side of the chain 20 is conveyed as the forward path, and the upper side of the chain 20 is used as the return path to return the gripper 22 to the transfer sprocket 24 side for transfer.

Blocking prevention powder is sprinkled on the printing paper 14 conveyed in the delivery section 10. This spraying device 28 is for printing paper 1
It is arranged along the width direction of the printing paper 14 in the middle of the transportation path of No. 4, and the powder particles of 70 μm or less are scattered from the upper position of the transportation surface to the downward atomized state.

In the delivery section 10 as described above, in the middle of the transport path from the transfer sprocket 24 to the upper part of the sheet pile device 16, the transport printing paper 14 is provided along the transport path.
Is provided with a sheet guide 30 for guiding the curl of the printing paper 14, a sheet decurler 32 for removing the curl of the printing paper 14, and a suction roller 34 for reducing the conveying speed to an appropriate speed for sheet pile. It is installed on the lower surface side of the printing paper 14.

As shown schematically in FIG. 2, the sheet guide 30 has a punching metal 36 formed in a curved shape along a conveying path, and the punching metal 36 is used as a guide surface. Air is sucked from the punch holes 38 so as to be in close contact with each other. A closed case 40 is provided to cover the lower surface side of the punching metal 36 for the suction action, and the sheet guide 30 is one curved thin container. A suction / exhaust fan 42 is attached to the lower surface of the container portion to suck air inside the sheet guide container to a negative pressure state so that the conveyed printing paper 14 is adsorbed to the surface of the punching metal 36 through the punch hole 38. There is. Since the printing paper 14 is forcibly transported by the gripper 22, the printing paper 14 is transported following the surface shape of the sheet guide 30. Since the suction / exhaust fan 42 is arranged on the lower surface of the sheet guide container, the suction air from the container is blown into the delivery housing 18.

As can be understood from FIGS. 1 and 2, the dust collector using the sheet guide 30 as described above uses the sheet guide 30 as one wall inside the delivery housing 18 to exhaust the air from the suction / exhaust fan 42. A cover 44 covering the side is formed. The cover 44 may use the delivery housing 18 itself, and in this case, since the front portion facing the sheet pile device 16 is usually open, it is only necessary to attach a plate covering the opening. In the case of the embodiment, a box-shaped cover 44 is separately housed inside the delivery housing 18 and is used as a dust container. A suction port 46 is opened on the bottom surface of the box-shaped cover 44, and a suction duct 48 formed by a pipe, piping or the like is connected to this as a suction passage, and the duct 48 is connected to a suction means 50. by this,
The air in the dust container is exhausted through the suction duct 48. Then, in the passage of the suction duct 48, a cyclone type dust collector 52 is arranged on the upstream side thereof, and an air filter 54 is arranged on the further downstream side thereof so that the air in the dust collecting container sucked by the suction means 50 is I am trying to pass these. Therefore, the air exhausted from the sheet guide 30 is temporarily exhausted into the dust collecting container surrounded by the cover 44, but this is first passed through the suction port 46 formed in the cover 44 to the cyclone type dust collector 52. Has been introduced to. As is well known, the cyclone type dust collector 52 introduces air as a swirling flow, and separates particles contained in the air inside by a difference in mass. As described above, the particles contained in the introduced air are the anti-blocking powder and have a very small mass, so that the swirling flow velocity is increased so that the powder can be separated. The separated powder particles are stored in a collection container 56 provided below the cyclone type dust collector 52, and the separated air is exhausted from the upper outlet of the cyclone type dust collector 52. Since the outlet of the cyclone type dust collector 52 is connected to the subsequent air filter 54, the powder particles which cannot be separated by the cyclone type dust collector 52 are collected again here and cleaned from the suction means 50 which follows. It is exhausted as air.

On the other hand, the structure of a dust collector using the suction roller 34 arranged on the conveying line will be described with reference to FIGS. 1 and 3. The suction roller 34 is shown in FIG.
As shown in detail in FIG. 3, a suction roller 60 is attached to the rotary drive shaft 58 at intervals.
The suction roller 60 has a suction through hole 62 formed on the outer peripheral surface thereof, and a negative suction pressure acts through the suction through hole 62 to suck the conveyed printing paper 14 and reduce the speed to a proper speed for piling. In order to apply a suction negative pressure to the suction rollers 60, a chamber 64 is arranged on the side surface portion of each suction roller 60, which is attached to the drive shaft 58 by a bearing or the like so as not to rotate, and an opening on the side surface of the roller 60 ( (Not shown). The chamber 64 is the connection pipe 6
The suction header 68 is connected to the suction header 68 via
Is further connected to the suction means 50 via a suction duct 48a as a suction passage. Therefore, the suction means 50
By the action of the suction roller 60 that is rotationally driven.
A negative suction pressure is applied through the suction passage hole 62 formed in the outer peripheral surface of the sheet, so that the conveyed printing paper 14 is sucked by the suction roller 6.
The speed is adjusted in synchronization with the rotation speed of zero.

In such a structure, in the air passage from the suction header 68 to the suction means 50, the cyclone type dust collector 52a is arranged on the upstream side, and the air filter 54a is arranged on the further downstream side. Suction means 50
The air sucked from the suction roller 60 passes through them. Therefore, the suction roller 60
The air sucked from the suction passage hole 62 is once introduced into the suction header 68, but this is guided to the suction duct 48a through the exhaust port 72 of the suction header 68 and first introduced into the cyclone type dust collector 52a. It is supposed to be done. As in the case of the sheet guide 30 side described above, this cyclone type dust collector 52a introduces air as a swirling flow and separates the particles contained in the air inside due to the difference in mass. The particles contained in the introduced air are the dust collector 5
The powder particles separated in 2a are collected in a collection container 56a provided in the lower part of the cyclone type dust collector 52a, and the separated air is exhausted from the upper outlet of the cyclone type dust collector 52a. Since the outlet of the cyclone type dust collector 52a is connected to the subsequent air filter 54a, the powder particles which could not be separated by the cyclone type dust collector 52a are collected again here and cleaned from the suction means 50 which follows. It is exhausted as air.

Since the decurler 32 is also constructed in the same manner as the suction roller 34, the same components are designated by the same reference numerals in FIG. 1 and their description is omitted.

In such an embodiment, the sheet guide 3
0, suction roller 34, and sheet decurler 32
Both of them are installed on the lower surface side of the blocking printing powder disperser 28 disposed above the transport printing paper 14 with the transport printing paper 14 sandwiched therebetween, and the air sucked by these is collected by the cyclone type collecting device. It is installed in a dust container or filter to collect dust. Therefore, the powder sprinkled from the powder sprinkling device 28 is atomized in the delivery housing 18, but the suction direction for collecting dust always flows toward the transport printing paper 14 so that the powder flows down. As a result, even if the dust collector is operated, the powder works to promote the adhesion of the powder to the transport printing paper 14 and does not hinder the adhesion.

In particular, in this embodiment, the sheet guide 30, the suction roll 34, the sheet decurler 32, etc. are all operated by the suction action of air, but this suction or exhaust path is utilized to achieve high efficiency. It can have a dust collecting function. This requires only the cyclone-type dust collectors 52 and 52a to be provided in front of the filter, which is originally located in the installation path of the fan for suction. Therefore, there are few modifications for the dust collecting equipment, and the cyclone type dust collector itself can be small in size. When actually using this device, the cyclone type dust collectors 52, 52a in the previous stage
The powder collection efficiency by the
% Has been reached. The collected powder is collected in containers 56, 56.
It can be easily removed by a.
6a can be reused. In addition, in combination with the higher collection efficiency, the maintenance efficiency of the filters 54, 54a is improved, and conventionally the cleaning is required to be performed once a week.
Although the replacement period was about 3 to 4 months, cleaning can be done once every 3 to 4 months, and the replacement period can be greatly extended. Since the filters 54 and 54a of this type cannot be reused, the maintenance cost can be significantly reduced.

[0022]

As described above, according to the present invention,
A cyclone-type dust collecting means and a filter in the intake or exhaust path of a sheet guide, suction roller, curl removing device, etc. equipped with a suction part that is installed in the delivery part of the sheet-fed printing press And arranged in series,
By sucking the internal air through these through the sheet guide of the delivery part, the powder such as the powder contained in the air can be removed with high efficiency, and the originally required suction passage can be used. Therefore, even if the facility cost for collecting dust is small, a large dust collecting improvement effect can be exhibited.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram of a delivery unit of a printing machine including a dust collector according to an embodiment.

FIG. 2 is a configuration diagram of a dust collector using a sheet guide.

FIG. 3 is a configuration diagram of a dust collector using a suction roll.

[Explanation of symbols]

 10 Delivery unit 12 Printing unit impression cylinder 14 Conveying printing paper 16 Sheet pile device 18 Delivery housing 20 Endless chain 22 Holding jaw 24 Transfer sprocket 26 Reverse sprocket 28 Blocking prevention powder spraying device 30 Sheet guide 32 Sheet decurler 34 Suction roller 36 Punching metal 38 Punch Hole 40 Closed case 42 Suction / exhaust fan 44 Cover 46 Suction port 48 Suction duct (suction passage) 50 Suction means 52, 52a Cyclone type dust collector 54, 54a Air filter 56, 56a Collection container 58 Rotation drive shaft 60 Suction roller 62 suction hole 64 chamber 66 connection pipe 68 suction header

Claims (5)

[Claims] 1. A dust collecting device in a delivery section of a sheet-fed printing press, on which blocking prevention powder is dispersed, which attracts the conveyed printing paper to a conveyed printing-paper guide plate arranged in a sheet-conveying path. A cover for covering the exhaust side of the fan is provided, suction means for sucking the air inside the cover is arranged in a suction passage connected to the cover, and a cyclone type dust collecting means is provided in the middle of the path to the air suction means for the cover. A dust collecting device for the delivery section of a sheet-fed printing press. 2. A dust collecting device in a delivery section of a sheet-fed printing press, on which blocking prevention powder is dispersed, which attracts the conveyed printing paper to a conveyed printing-paper guide plate arranged in a sheet conveyance path. A cover for covering the exhaust side of the fan is provided, suction means for sucking the air in the cover is arranged in a suction passage connected to the cover, and a filter is arranged in the middle of the path to the air suction means in the cover. A dust collecting device for a delivery section of a sheet-fed printing press, characterized in that a cyclone type dust collecting means is provided on the suction upstream side of the filter. 3. A dust collecting device in a delivery section of a sheet-fed printing press to which blocking prevention powder is sprayed, from a suction section for adsorbing the conveyed print sheet on a conveyance line surface arranged in a sheet conveyance path. A dust collecting device for a delivery section of a sheet-fed printing press, characterized in that a cyclone type dust collecting means is provided on the way to the suction means. 4. A dust collecting device in a delivery section of a sheet-fed printing press to which blocking prevention powder is sprayed, from a suction section for adsorbing the conveyed print sheet on a conveyance line surface arranged in a sheet conveyance path. A dust collecting device for a delivery section of a sheet-fed printing press, wherein a filter is arranged on the way to the suction means and a cyclone type dust collecting means is provided on the suction upstream side of the filter. 5. The dust collecting apparatus of the sheet-fed printing press delivery section according to claim 3, wherein the conveyed printing paper suction section is a curl removing device or a suction roller.