JP4957958B2 - Blanket cylinder dust remover - Google Patents

Description

The present invention is an apparatus for removing dust adhering to a blanket mounted on the surface of a blanket cylinder in an offset printing machine, and is a technique particularly suitable for a rotary printing machine having a large number of plate cylinders.

Generally, dust adhering to the blanket mounted on the surface of the blanket cylinder in an offset printing machine will lead to deterioration of the quality of the printed product, and of course it will not be generated. Is required. These dust removal means are performed by running an endless brush coated with a solvent in the axial direction of the blanket in contact with the surface of the blanket. In such an apparatus, the brush of the endless brush runs on the outer peripheral surface of the blanket in the direction of the center line of the blanket cylinder by the rotation of the pulley, while the solvent is sprayed from the nozzle toward the brush, and the dust on the outer peripheral surface of the blanket is However, the dust adhering to the brush is removed together with the solvent adhering to the brush by the brush cleaning device, and the solvent containing the dust falls on the collecting tray and opens to the collecting tray. To a predetermined place through a collecting pipe. After the dust removal by the endless brush is completed, the wiper roll is brought into contact with the surface of the blanket and rotated in the same direction as the blanket (the traveling direction of the contact surface is opposite), and the solvent adhering to the outer peripheral surface of the blanket is removed.

The blanket dust removing device in the offset printing machine of the above-described conventional configuration uses a solvent, which is a petroleum product, and thus wastes valuable petroleum resources and may cause environmental pollution depending on how the used cleaning liquid is processed. There is a problem to say. In addition, if the dust removal device is operated while the printing machine is in operation, the printing paper printed during that time will be damaged, so the printing machine may sometimes be stopped and implemented, which is an inefficient operation and printing. It was not always effective, such as an increase in downtime due to machine stoppage.

Therefore, the first and second rotating brushes are in contact with the outer peripheral surface of the blanket mounted on the surface layer of the blanket cylinder in the offset printing machine, and the rotating body is disposed in contact with the first and second rotating brushes. The first and second rotating brushes remove dust such as ink from the outer peripheral surface of the blanket, the dust adhering to the first and second rotating brushes is scattered by the rotating body, and the scattered dust is first, There is a configuration in which the dust collected by the second rotating brush and the cover covering the rotating body is collected by a vacuum dust collector. There is also a dust removing device for a blanket cylinder of an offset printing press that is provided on the upstream side of the first rotating brush with respect to the blanket and is configured to include a dryer that dries the surface of the blanket (see, for example, Patent Document 1).

Utility Model Registration No. 2566949

According to the above-described invention of Patent Document 1, dust such as ink adhering to the surface of the blanket is dried by the dryer and then peeled off by the rotating brush, so that the dust is reliably removed. Also, since no solvent is used, valuable oil resources are not wasted, and no processing equipment for used solvent is required, and a nozzle that sprays and applies a solvent to a brush that removes dust from the outer peripheral surface of the blanket and a solvent for the nozzle This means that not only the device configuration is simplified but also the endless brush longer than the blanket is not required, and the entire dust removal device can be made compact. Have advantages.

However, since the invention of Patent Document 1 rubs the blanket surface with a brush, when carried out during printing, the ink transferred from the plate surface onto the blanket is not a little in contact with the transferred ink, and the printed matter is damaged. Product quality is degraded. The printed product thus obtained could not meet the quality standards and was treated as waste paper. In addition, there were not a few gaps between the brushes, so extremely small dust may not be removed, which is an inefficient operation such as sometimes stopping the printing machine and cleaning the blanket. It was. Considering the various problems described above, there was a considerable room for development of a blanket cylinder dust removing device in an offset printing press.

An object of the present invention is to provide a dust removal device for a blanket cylinder that can completely and efficiently remove dust adhering to the surface of the blanket.

As a means for solving the problems of the present invention, in a dust removing apparatus for removing dust adhering to a blanket in offset printing, the dust removing device is disposed so as to face the blanket and rotates while moving in contact with the blanket. A dust removing roller for removing the dust, a driving unit for rotating and moving the dust removing roller, a cleaning unit for cleaning dust adhering to the dust removing roller, and a control unit for controlling the driving unit and the cleaning unit. Device.

Further, the dust removing roller has an adhesive layer on the surface layer of the shaft core serving as a base shaft of the roller, and has a rubber layer containing at least polyvinyl chloride resin on the upper layer of the adhesive layer.

The dust removing roller is made of a material selected from the group consisting of polyvinyl chloride resin (PVC), dibutyl phthalate (DBP), tricresyl phosphate (TCP), dibutyltin dilaurate (DBTDL), and nitrile rubber (NBR). The

The drive unit moves between a first drive unit that instructs the rotation direction of the dust removing roller, a second drive unit that instructs the movement direction on the blanket, and a dust removal point of the blanket and the cleaning unit. 3 driving means.

The cleaning unit also includes a tray for storing liquid for removing dust attached to the dust removal roller, a blade for scraping dust and excess liquid attached to the dust removal roller, and a liquid for supplying liquid to the tray. And a supply device.

The control unit includes a first control unit that controls the rotation direction of the dust removing roller via the drive unit, a second control unit that controls a moving direction on the blanket, a dust removal point of the blanket, and a cleaning unit. Third control means for controlling movement, speed control means for controlling the rotational speed and moving speed of the dust removing roller, cleaning time control means for controlling the cleaning time of the dust removing roller in the cleaning section, Liquid supply amount control means for controlling the liquid supply amount.

The dust removing roller has a surface adhesive strength of 2N to 5N.

The dust removal roller has a surface hardness of 10 HS to 30 HS (spring type A type).

The dust removal roller has a surface average roughness of 2 μm to 10 μm.

The dust removing roller includes at least a metal oxide.

Furthermore, the liquid stored in the tray of the cleaning unit is water whose hydrogen ion concentration is adjusted to pH 6 to pH 9.

The blanket cylinder dust removing device of the present invention can remove dust completely without damaging the printed pattern on the blanket transferred from the printing plate, so that a high quality and uniform product can be continuously obtained as a printed product. The effect is that stable production is possible.

Further, it is possible to remove dust appropriately during printing operation, and it is not necessary to stop the machine. This brings about the effect that the downtime of the printing machine can be reduced and the work efficiency can be improved.

In addition, the dust removal roller of the dust removal device can recover its stickiness by supplying a liquid (for example, water) and can be used repeatedly, so that it is not necessary to use petroleum as a cleaning liquid as in the prior art. There is an effect that improvement can be achieved.

In addition, the dust removal device can instantly remove dust on the blanket, greatly reduce the number of abnormal products generated during the production of high-quality printed products, and reduce downtime due to machine stoppage. There is an effect that the cost for the cost can be reduced.

Embodiments of the present invention will be described with reference to the drawings, taking a dust removing device in an offset printing machine as an example. FIG. 1 is a schematic view of a blanket cylinder dust removing device according to the present invention. 2 is an enlarged schematic diagram of the dust removing device, FIG. 3 is a schematic diagram of a dust removing roller in the dust removing device, and FIG. 4 is an example of a schematic diagram of a conventional blanket cylinder dust removing device.

This will be described as appropriate based on the schematic diagrams shown in FIGS. As shown in FIG. 1, the dust removing device (1) of the present invention removes dust adhering to the surface of a blanket (3) mounted on a blanket cylinder (2) facing the impression cylinder (4). It is arranged opposite to 3). The dust removing device (1) has a dust removing roller (5) having an adhesive rubber layer (6) on the surface layer, and water (10) is retained for supplying liquid (for example, water) to the dust removing roller (5). A receiving tray (9), a liquid supply device (24) for supplying the liquid (10) to the receiving tray (9), and a blade (21) for removing dust and excess water adhering to the surface of the dust removing roller (5). Cleaning section (25), first driving means (30) for instructing the rotational direction of dust removing roller (5), second driving means (31) for instructing the moving direction on blanket (3), dust removal of blanket A drive unit (22) comprising a third drive means (32) for moving between the location and the cleaning unit, and a first direction for controlling the rotational direction of the dust removing roller (5) via the drive unit (22). Control means (35), the direction of movement on the blanket Second control means (36) to be controlled, third control means (37) to control the movement of the dust removal point of the blanket and the cleaning unit, speed control means (38) to control the rotational speed and movement speed of the dust removal roller The control unit (23) includes a cleaning time control unit (39) for controlling the cleaning time of the dust removing roller in the cleaning unit, and a liquid supply amount control unit (40) for controlling the amount of liquid supplied to the tray of the cleaning unit. It is composed of

Further, as shown in FIG. 3, the dust removal roller (5) has an adhesive layer (7) on the surface of the shaft core (8) which is a basic shaft, and directly contacts the blanket (3) on the upper layer. It has a roller configuration having a rubber layer (6). Moreover, this rubber layer (6) has adhesiveness and can adsorb dust. When this adhesiveness falls, adhesiveness can be recovered | restored by immersing in the liquid (10) shown in FIG. Further, when the adhesive layer (7) or the rubber layer (6) deteriorates, it can be peeled off from the shaft core (8) to provide a new adhesive layer (7) or rubber layer (6).

The rubber layer (6) of the dust removing roller (5) comprises 20% to 25% polyvinyl chloride resin (PVC), 42% to 48% dibutyl phthalate (DBP), and 2% to 6% tricresyl phosphate (TCP). %, Dibutyltin dilaurate (DBTDL) 2% to 6%, nitrile rubber (NBR) 25% to 35% paste was poured into a cylindrical mold having a shaft (8) as a main axis, and heated. It was produced by heating and polymerizing at a set temperature of 100 ° C. to 250 ° C. (in this example, set to 200 ° C.) in an apparatus (for example, a high temperature thermostatic bath DH type manufactured by Futaba Kagaku Co., Ltd.) The produced dust removing roller (5) is only one example, and the embodiment is not particularly specified as long as the rubber layer (6) has adhesiveness.

In addition, as shown in FIG. 2, the liquid (10) can be retained in the tray (9), and the liquid (10) is supplied from the liquid supply device (24). Here, the liquid (10) in the tray (9) can be automatically supplied by a level sensor (not shown) when the arbitrarily set quantity is not satisfied. Further, the liquid supply device (24) can be notified by an alarm device (not shown) (for example, a buzzer) when the liquid stored in the tank does not satisfy the predetermined amount.

As shown in FIG. 4, the dust remover of the blanket cylinder (2) in a general offset printing machine is such that the dryer (11) dries and removes viscous materials such as ink on the outer peripheral surface of the blanket cylinder (2). Easy dust condition. Next, the first and second rotating brushes (13, 14) come into contact with the blanket cylinder (2), and the dried dusty state on the outer peripheral surface of the blanket cylinder (2) is peeled off. The removed dust rotates in a direction in which the first rotating brush (13) and the second rotating brush (14) approach each other, so that the first and second rotating brushes (13, 14) and the blanket cylinder are rotated. Collected in the space formed by (2). Further, dust adhering to the first and second rotating brushes (13, 14) is impacted by the rotating body and shaken off. Further, the cover (12) covers the first rotating brush (13), the second rotating brush (14), the rotating body (15), etc., and is sucked by the vacuum dust collecting device (16) and placed in one place. It is what is collected.

On the other hand, as shown in FIG. 2, the dust removing device (1) of the blanket (3) mounted on the blanket cylinder (2) in the offset printing machine of the present invention removes dust (not shown) adhering to the surface of the blanket (3). For this purpose, a dust removal roller (5) having a rubber layer (6) having an adhesive force applied to the surface layer is disposed at a position facing the blanket (3). The dust removing roller (5) receives a command from the control unit (23), and the rotation direction, the moving direction, and the moving speed are controlled via the driving unit (22). The dust removal roller (5) is used while being in contact with the blanket (3), and the rotation of the blanket cylinder (2) is transmitted to the dust removal roller (5) itself. Will rotate in the same direction as the direction of rotation. In addition, the rotation direction of the dust removing roller (5) can be arbitrarily set by a command from the control unit (23). Further, the dust removal roller (5) can be rotated alone by the power from the drive unit (22), and the rotation speed of the dust removal roller (5) can be arbitrarily changed. Furthermore, the dust removal roller (5) can be shifted during the removal operation of dust attached to the surface of the blanket (3).

After removing the dust adhering to the blanket (3), the dust removal roller (5) is immersed in water (10) adjusted in hydrogen ion concentration stored in the tray (9) in order to restore adhesiveness. The dust and excess water are removed by the blade (21) located on the downstream side where the dust removing roller (5) rotates.

Further, the dust removing roller (5) used for dust removal of the blanket (3) has a surface hardness of 18HS (spring type A type), a surface average roughness of 5 μm, and a dust removing roller (30) by the first driving means (30). 5) The rotation direction of the blanket (3) is opposite to the rotation direction of the blanket (3), and the dust removing roller (5) is set at a position where dust is present on the blanket (3) by the second driving means (31). The pressing force on the blanket (3) was set to 0.8 MPa by the third driving means (32) that moves between the dust removal location of (3) and an arbitrary predetermined position, and the dust removal state was confirmed. The dust removal roller (5) used at this time was colored so that the removed dust can be easily visually observed. For coloring, 1% of titanium white as a metal oxide was added as a pigment to make the surface color white. The liquid stored in the tray (9) has a hydrogen ion concentration of pH8. If the hydrogen ion concentration is set to be strongly acidic (for example, pH 5), the dust removing roller (5) itself is deteriorated. Conversely, if it is set to be alkaline (for example, pH 10), the dust removing roller (5) is used. In addition to reducing the adhesive strength, the printed pattern transferred onto the blanket is hindered.

In removing the dust adhering to the blanket (3), the adhesive force of the dust removing roller (5) occupies a large weight. Therefore, the overall evaluation when the surface hardness is 18 HS, the surface roughness is 5 μm, the hydrogen ion concentration of water to be attached to the dust removal roller (5) is fixed at pH 8, and the adhesive force is changed in the range of 2N to 5N. went. The obtained results are shown in Table 1. As a result, a level of 3N adhesive strength was suitable.

As the rubber layer (6) of the dust removal roller (5), polyvinyl chloride resin is compounded in a ratio of 26%, dibutyl phthalate 46%, tricresyl phosphate 4%, dibutyltin dilaurate 4%, and nitrile rubber 20%. Using the produced dust removal roller (5), the surface hardness is 18 HS, the surface roughness is 5 μm, the hydrogen ion concentration of water to be adhered to the dust removal roller (5) is fixed at pH 8, and the adhesion force is 3N. Is disposed in the dust removal device (1), and the dust adhered to the blanket (3) is removed. As a result, the ink transferred to the blanket (3) is not removed and only the adhered dust is reliably removed. I was able to. Moreover, even if the dust removal operation described above was repeatedly performed, the effect was not changed.

Needless to say, by arbitrarily changing the characteristics of the dust removing roller (5), it is possible to remove dust and the like adhering to the cylinder of any printing machine. Furthermore, it is naturally conceivable that the metal oxide added contributes to the stabilization of the surface hardness of the roller as well as the pigment as the coloring of the surface of the dust removal roller (5).

As mentioned above, although it demonstrated using the figure in the Example, if the dust removal apparatus (1) used by this invention uses the dust removal roller (5) which has adhesiveness, it does not designate a dust removal means specially. Alternatively, another form of means may be used.

As an application example, when a sensor for observing the surface of a blanket is installed and dust is detected, it is possible to easily assume a case where a dust removing roller is automatically brought into contact with the location with a pressing force that is arbitrarily set.

It is the schematic of the blanket cylinder dust removal apparatus of this invention. It is the schematic which expanded a part of blanket cylinder dust removal apparatus of this invention. It is the schematic of the dust removal roller of the blanket cylinder dust removal apparatus of this invention. It is a figure which shows an example of the schematic of the conventional blanket cylinder dust removal apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dust removal device 2 Blanket cylinder 3 Blanket 4 Pressure drum 5 Dust removal roller 6 Rubber layer 7 Adhesive layer 8 Shaft core 9 Sauce tray 10 Liquid (water)
DESCRIPTION OF SYMBOLS 11 Dryer 12 Cover 13 1st rotary brush 14 2nd rotary brush 15 Rotating body 16 Vacuum dust collector 21 Blade 22 Drive part 23 Control part 24 Liquid supply apparatus 25 Cleaning part 30 1st drive means 31 2nd Drive means 32 Third drive means 35 First control means 36 Second control means 37 Third control means 38 Speed control means 39 Cleaning time control means 40 Liquid supply amount control means

Claims (1)

In a dust removing device that removes dust adhering to a blanket in offset printing , a shaft serving as a base shaft of a roller that is disposed opposite to the blanket and rotates and moves while contacting the blanket to remove the dust adhering to the blanket It has an adhesive layer on the surface layer of the core, and on the upper layer of the adhesive layer, polyvinyl chloride resin (PVC) 20% to 25%, dibutyl phthalate (DBP) 42% to 48%, tricresyl phosphate (TCP) 2% -6%, dibutyltin dilaurate (DBTDL) 2% to 6%, nitrile rubber (NBR) 25% to 35%, surface adhesion 2N to 5N, surface hardness 10HS to 30HS (spring type) A type) dust removal roller, a drive unit for rotating and moving the dust removal roller, and dust adhering to the dust removal roller A cleaning unit, a first control unit for controlling the rotation direction of the dust removing roller via the drive unit, a second control unit for controlling a moving direction on the blanket, a dust removal point of the blanket, and the cleaning unit Third control means for controlling the movement of the dust removal speed, speed control means for controlling the rotational speed and movement speed of the dust removal roller, a cleaning time control means for controlling the cleaning time of the dust removal roller in the washing section, A blanket cylinder dust removing device comprising: a control unit having a liquid supply amount control means for controlling the amount of liquid supplied to the tray .

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