JP3348651B2 - Guide roll cleaning method and guide roll cleaning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for cleaning guide rolls of a printing press. The present invention relates to a guide roll cleaning method and a guide roll cleaning device.

[0002]

2. Description of the Related Art An offset rotary press used in a newspaper printing system is composed of a plurality of printing presses and a folding section for cutting a print web passing through the plurality of printing presses by superimposing them.

In such an offset rotary press,
The length of the web passing path between the printing press located farthest from the folding section and the folding section, that is, the length of the web passing path is several tens of meters, and the total number of guide rolls constituting the web passing path is a total of the set. In some cases, the number exceeds 100.

In the guide rolls described above, the surface often comes into contact with the printing surface of the print web, and ink residue or paper powder adheres to the surface of the guide roll in paste form, and the printed roll passes through the print web. In some cases, re-transfer may cause soiling of the paper surface, or the tension on the print web may not be applied uniformly, and the running of the print web may become unstable. Conventionally, in order to avoid such a situation, the surface of the guide roll is periodically wiped to prevent retransfer to the print web and to ensure stable running of the print web.

FIG. 5 is an explanatory view showing a conventional guide roll cleaning method. As shown in FIG.
Is for guiding the printing web 2 along the web passing path. In the guide roll 1, a driving motor 4 is attached to the support shaft 1a via an endless belt 3 or a transmission gear. When the guide roll 1 is washed, the printing web 2 impregnated with the washing liquid is run, and the driving motor 4 is operated, so that the peripheral speed difference between the guide roll 1 and the printing web 2 (v1-v2 or v2-v1), and the difference in peripheral speed causes the printing web 2 to wipe off the paste-like ink residue and paper dust 5 adhering to the surface of the guide roll 1.

As another method, a braking device is provided on the support shaft 1a of the guide roll 1, and the braking device is operated periodically when the guide roll 1 is washed, so that the guide roll 1 and the printing web 2 are connected to each other. It is also known to cause a peripheral speed difference between them.

[0007]

However, the conventional method of cleaning the guide roll has several problems. That is, as a first problem, at the time of guide roll cleaning, a peripheral speed difference is generated between the guide roll to be cleaned and the print web to exert a cleaning effect. Fluctuation of the tension applied to the print web in the web passing path becomes large (a fluctuation of about 0 to 50 kg occurs), and in the worst case, the print web may be cut. In order to prevent the cutting of the print web, the guide rolls are divided into several groups, and the rotation speed of the selected guide rolls is set to a positive side or a negative side with respect to the print web traveling speed, and the printing is performed. It is necessary to suppress the fluctuation of the tension applied to the web. Therefore, there has been a problem that the combination of the guide rolls and the operation sequence of the combined guide rolls are complicated.

[0008] Further, a number of guide rolls are arranged in the web passing path, and the space around the guide rolls is reduced. For this reason, the second problem is that it is difficult to install a device for generating a peripheral speed difference around the guide roll due to space limitations.

The present invention focuses on the above conventional problems, and
Secondly, it is an object of the present invention to provide a guide roll cleaning method and a guide roll cleaning apparatus capable of minimizing fluctuations in the tension of a print web, and secondly, enabling mounting in a limited narrow space. I do.

[0010]

According to the present invention, there is provided a method for cleaning a guide roll, comprising: running a print web along a web passing path; and cleaning the guide roll by contact between the print web and the guide roll. A method for cleaning a roll, comprising: applying vibration having a radial component to the guide roll to apply a vibration to the print web.
The cleaning was performed by varying the contact pressure of the guide roll .

Further, the guide roll cleaning apparatus according to the present invention is a guide roll cleaning apparatus for cleaning a guide roll constituting a web passing path, wherein vibration having a radial component of the guide roll can be generated. A vibration generating means is provided on the guide roll, and contacts the printing web.
The contact pressure is variable . Preferably, compressed air is used as power for the vibration generating means.

[0012]

According to the present invention constructed as described above, when vibration including the radial component is applied to the guide roll itself at the time of cleaning, the vibration causes minute contact and separation between the print web and the surface of the guide roll, The fluctuation of the contact pressure is repeated even without the contact. Then, the paste-like ink residue adhered to the surface of the guide roll or the like is transferred to the printing web due to contact / separation caused by vibration or fluctuation in contact pressure. In addition, dirt such as paper dust is separated from the surface of the guide roll by vibration of the guide roll and falls off.

According to the present invention, there is no need to forcibly drive or forcibly drive the guide rolls, and there is almost no fluctuation in the tension of the print web up to the folded portion. For this reason, it is not necessary to consider the cutting of the print web due to excessive tension, and it is not necessary to perform a sequence considering the balance of tension. Therefore, the control for performing the cleaning operation can be made inexpensive and simple.

The compressed gas can generate a large force with a small capacity. For this reason, if compressed air is used as the power of the vibration generating means that vibrates the guide roll, the vibration generating means can be reduced in size, and the vibration generating means can be mounted in a narrow space around the guide roll. It becomes possible.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a guide roll cleaning method and a guide roll cleaning apparatus according to the present invention will be described below in detail with reference to the drawings. FIG.
FIG. 2 is an enlarged view of a main part showing a state where the cleaning device according to the present embodiment is mounted on a guide roll, FIG. 2 is a side view and a front view of the device, and FIG. FIG.

As shown in these figures, an offset rotary press 10 for newspaper printing provided with a guide roll cleaning apparatus according to the present embodiment comprises a plurality of printing presses 12 and a printing web 14 passing through these printing presses. And a folded portion 16 for cutting.

The printing machine 12 prints the printing web 14 fed from a roll-shaped web 18 via a plurality of guide rolls 20, and includes a plate cylinder 22 for mounting a printing plate, and a plate cylinder 22 for mounting the printing plate. An ink roller 24 for supplying ink of each color to the cylinder 22, and a rubber blanket wrapped around the ink roller 24,
A blanket cylinder 25 for receiving the transfer of the ink from the plate cylinder 22 and printing the transferred ink on the printing web 14 is a main component.

A plurality of guide rolls 20 and a rail frame (not shown) are provided at the subsequent stage of the printing press 12, and a web passing course of the printing web 14 passing through the printing press 12 is set by selecting these guides as appropriate. Like that. A folding section 16 is provided at the end of the selected web passing course, and the print web 14 is introduced into the folding section 16.

The folding section 16 includes a guide roll 20a for superimposing the print webs 14, a folding cylinder 26 disposed at a subsequent stage of the guide roll 20a to fold the superimposed print webs 14, and The print web 14 includes a cutter unit 28 that is disposed at a subsequent stage of the folding cylinder 26 and cuts the folded print web 14 into a predetermined size. Superimposition, folding, and cutting can be performed continuously.

In the web passing course of each printing web 14, a compensator 30 as means for changing the web passing course length is provided on the upstream side of the folding section 16, and the position of the compensator 30 is determined by each printing. It can be adjusted for each web 14. Therefore, by moving the compensator 30 in the direction of the arrow 31,
The position of each print web 14 to be cut can be changed, so that the balance of the top and bottom margins at the time of cut can be adjusted for each print web 14.

The printing web 14 after passing through the printing press 12
Is guided by a plurality of guide rolls 20.
And the main guide roll 2 in the web passing path
0 is provided with a guide roll cleaning device 32 for cleaning the surface of the guide roll 20. Here, the guide roll cleaning device 32 has the same axis as the guide roll 20, and a bearing support block 38 attached to a support shaft 34 protruding from both end surfaces of the guide roll 20 via a bearing 36, The block 38 has a front end surface attached thereto and a bottom surface constituted by a vibration generator 40 attached to a support table (not shown).

At the center of the bearing support block 38, a mounting hole 42 corresponding to the outer diameter of the bearing 36 is provided, and the mounting hole 42 can be divided into two at the position of the maximum diameter (38U). , 38D). This is guide roll 2
The fixing of the support shaft 34 by the bearing support block 38 is performed by first fitting the outer diameter of the bearing 36 into the bearing support block 38D and supporting the bearing from above. Block 38
This is performed by putting U on and connecting the two with connecting means (not shown).

As described above, the vibration generator 40 has its distal end surface fixed to the bearing support block 38D, while the bottom surface 40D is mounted on a support table (not shown). The vibration generator 40 is connected to a compressed air supply source 4 installed outside.
4, compressed air can be introduced through a solenoid valve (not shown), and the introduction of the compressed air enables the vibration generator 40 to generate vibration in the radial direction (the direction of the arrow 46) of the guide roll 20. ing. In the vibration generator, the amplitude and frequency of the vibration can be arbitrarily adjusted. For this reason, when cleaning the guide roll 20, the parameters (amplitude and frequency) may be adjusted in consideration of the size and tension of the print web 14 so that the cleaning efficiency is maximized. Further, the vibration direction by the vibration generator 40 is the arrow direction 46 as described above, but this direction may be any radial direction of the guide roll 20,
For example, as shown in FIG. 2A, the winding angle of the print web 14 around the guide roll 20 is made to match the direction in which the entrance side and the exit side are equal, or as shown in FIG. May be rotated by an angle θ with respect to FIG. 1A, and the vibration direction may be set so as to be orthogonal to the print web 20 on the exit side.

A procedure for removing the paste-like ink residue and paper dust adhered to the surface of the guide roll 40 by using the vibration generator 40 having the above-described configuration will be described. In the offset rotary press 10, as printing is repeated, ink is transferred from the printed printing web 14 to the guide roll 2.
0 and adheres to the surface in a paste form.

When the paste-like ink residue or paper dust (hereinafter referred to as dirt) 48 adhered to the surface of the guide roll 20 is washed, printing is first stopped once, and the printing web 14 is started from the upstream side of the web passing course. Is sprayed on the web to impregnate the printing web with the cleaning solution. Simultaneously with this operation, the printing web 14 is caused to travel along the web passing path, and the printing web 14 impregnated with the cleaning liquid is brought into contact with the guide roll 20. After the printing web 14 is brought into contact with the guide roll 20 during the cleaning operation, the vibration generator 40 is then operated, and the arrow 46
The guide roll 20 to be cleaned is vibrated in the direction of.

FIG. 4 shows the guide roll 20 in a vibrated state.
It is explanatory drawing which shows the surface of. As shown in FIGS. 1A to 1C, when the guide roll 20 is vibrated, a slight gap 50 is formed between the surface of the guide roll 20 and the printing web 14, and fine contact and separation occur. repeat. For this reason, the dirt 48 adhering to the surface of the guide roll 20 is removed by the guide roll 2.
Guide roll 20 by contact and separation of print web 14
Moves from the surface to the printing web 14 side, and separates from the guide roll 20 as the printing web 14 travels.

Even if the gap 50 is not formed between the surface of the guide roll 20 and the printing web 14, the contact pressure fluctuates between them. Since the dirt 48 comes into close contact with the print web 14 due to the change in the contact pressure, when the print web 14 separates from the guide roll 20, the dirt 48 is torn and moves toward the print web 14 side. Since the guide roll 20 repeatedly contacts the print web 14 as the print web 14 travels, the stains 48 move one after another from the surface of the guide roll 20 to the print web 14,
Thus, the surface of the guide roll 20 can be cleaned.

After the cleaning of the guide roll 20 is completed, the jetting of the cleaning liquid to the printing web 14 is stopped,
The surface of the guide roll 20 may be wiped dry with the printing web 14 not impregnated with the cleaning liquid. The conditions under which the guide roll 20 and the print web 14 are repeatedly brought into contact with and separated from each other by vibrating the guide roll 20 vary depending on the size and tension of the print web 14 or the external dimensions of the guide roll 20. It may be adjusted individually by adjusting the actual item.

If the guide roll cleaning device 32 according to the present embodiment is used, the print web 14
Therefore, it is possible to minimize the fluctuation of the tension applied to the print web 14, thereby preventing the printing web 14 from being cut off by washing. For this reason, it is possible to simultaneously wash many guide rolls 20 to be washed, which are arranged in the web passage path, and it is possible to shorten the washing time.

Further, in the present embodiment, the support shaft 34 is projected from both end surfaces of the guide roll 20, and the bearing 36 attached to the support shaft 34 is held so that the guide roll 20 can be vibrated. However, when the guide roll 20 is rotatable with respect to the support shaft 34, the support shaft 34 may be directly held by the bearing support block 38 without the intervention of the bearing 36.

In this embodiment, compressed air is used as the power of the vibration generator serving as the vibration generating means for the purpose of reducing the size of the apparatus itself. However, the present invention is not limited to this. An electric or other vibration generator may be used.

[0032]

As described above, according to the present invention, a method for cleaning a guide roll, in which a print web is run along a web passing path and the guide roll is cleaned by contact between the print web and the guide roll. The guide roll is rolled and contacted with the print web, and vibration having a radial component is applied to the guide roll, so that excessive tension is not applied to the print web and the print web is cut. Can be prevented.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part showing a state in which a cleaning device according to the present embodiment is mounted on a guide roll.

FIG. 2 shows a side view and a front view of the same device.

FIG. 3 shows a schematic configuration diagram of an offset rotary press using the same device.

FIG. 4 is an explanatory diagram showing a surface of a guide roll 20 in a vibrating state.

FIG. 5 is an explanatory view showing a conventional guide roll cleaning method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide roll 2 Printing web 3 Endless belt 4 Driving motor 5 Paste ink residue and paper powder 10 Offset rotary press 12 Printing machine 14 Printing web 16 Folding part 18 Winding paper 20 Guide roll 22 Plate cylinder 24 Ink roller 25 Blanket cylinder 26 Folding cylinder 28 Cutter unit 30 Compensator 31 Arrow 32 Guide roll cleaning device 34 Support shaft 36 Bearing 38U, 38D Bearing support block 40 Vibration generator 42 Mounting hole 44 Compressed air supply source 46 Arrow 48 Paste ink residue or paper powder 50 Void

Continuation of front page (56) References JP-A-10-67100 (JP, A) JP-A-62-255150 (JP, A) JP-A-5-162295 (JP, A) JP-A-10-16199 (JP) JP-A-4-126252 (JP, A) JP-A-7-195681 (JP, A) JP-A-3-83646 (JP, A) JP-A-11-70641 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B41F 35/00

Claims (3)

(57) [Claims] 1. A method of cleaning a guide roll in which a print web is run along a web passing path, and the guide roll is cleaned by contact between the print web and the guide roll. By applying a vibration having a component of
A method of cleaning a guide roll, wherein the cleaning is performed by changing the contact pressure of the guide roll. 2. A guide roll cleaning device for cleaning a guide roll constituting a web passage path, wherein a vibration generating means capable of generating vibration having a radial component of the guide roll is provided on the guide roll. Providing the printing
A guide roll cleaning device characterized in that the contact pressure with the web is variable . 3. The guide roll cleaning apparatus according to claim 2, wherein compressed air is used as power for said vibration generating means.