JPS63268648A - Guide roller-cleaning method for rotary press - Google Patents

Abstract

PURPOSE:To wipe contaminants off a guide roller, by applying a cleaning liquid to a running paper, and causing a plurality of guide rollers on the paper- discharging side of a printing part to be rotated at a velocity relative to the paper. CONSTITUTION:A rotary press is set into a slow speed rotation condition, and a cleaning liquid 34 is applied to a running paper 22. The paper 22 wetted with the liquid 34 reaches a guide roller 26 on the paper-discharging side of a printing part 16, and when the guide roller 26 is rotated at a circumferential velocity different from the velocity of the paper 22, the paper 22 slips on the surface of the guide roller, and an ink or the like adhered to the surface is dissolved by the liquid 34. Thereafter, a part of the paper 22 to which the liquid is not adhered makes sliding contact with the guide roller 26, whereby the dissolved ink or the like is transferred onto the paper 22, and is wiped off. Usually, the surface of the guide roller has an extremely smooth surface condition because of the presence of chromium plating or the like, so that the contaminants are extremely easily removed by the slipping of the paper 22.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for automatically removing dirt from a large number of guide rollers disposed on the paper ejection side of a rotary printing press rather than the printing section. More specifically, the present invention relates to a guide roller cleaning method in which a cleaning liquid is applied to printing paper, brought into IS contact with the guide roller, and wiped off with a difference in relative speed between the two.

[Prior Art] A rotary press for printing newspapers usually has a configuration in which three to four printing units are arranged in parallel. An example is partially shown in FIG. 2, in which only two printing units are shown to simplify the drawing. Each printing unit 1o includes a printing section 16 including a blanket cylinder 12 and the like, and a paper feeding section 2o that holds a web 18. Paper feed section 20
The running paper 22 pulled out from the
The printer is guided by a plurality of guide rollers 26 to reach the printing section 16, where it is printed, and then guided by a plurality of guide rollers 26 to a folding machine (not shown).
Cutting and folding are then performed.

Usually, about 15 to 20 guide rollers 26 are installed on the paper discharge side of the printing section 16, that is, between the printing section 16 and the folding machine. These guide rollers 26, especially the four to six guide rollers close to the printing section 16, come into contact with the running paper immediately after printing, and therefore a large amount of ink and paper powder adheres thereto. Guide roller 2
The surface of No. 6 is polished and chrome-plated to make it smooth, making it difficult for ink and paper dust to adhere to it, but it still ends up getting dirty when a large amount of printing is done.

When the guide roller 26 becomes dirty, the surface of the printed paper becomes slightly soiled, and the running paper is likely to have vertical wrinkles due to unevenness caused by deposits, resulting in serious defects that reduce the quality of the printed matter.

Therefore, it is necessary to wipe off the dirt on the guide rollers when replacing the plate or when printing is finished.

In the case of blanket cylinders, special cleaning equipment has already been developed and cleaning can be carried out automatically, but suitable cleaning technology has not yet been developed for the large number of guide rollers, and the current state is that they rely on manual labor. It is.

[Problems to be Solved by the Invention] In the case of a newspaper rotary press having three to four printing units, printing work is usually performed by four to six workers. In this case, cleaning the guide roller requires 3 to 4 workers for 15 to 2 hours.
It takes about 0 minutes, which has the drawback of causing a very large time and economic loss. In addition, it is not only an unpleasant job that requires entering the inside of a complicated device that is covered with ink, etc., which stains the body and clothes, but also has other problems such as being dangerous due to the high place and slippery environment.

An object of the present invention is to provide a cleaning method that eliminates the drawbacks of the prior art as described above and can automatically wipe off dirt on guide rollers of a rotary printing press in a short period of time.

[Means for Solving the Problems] The present invention, which can achieve the above-mentioned objects, runs the rotary printing machine slowly while threading the paper and applying a regular back tension to the paper feed section. A cleaning liquid is applied to the running paper to moisten it, and multiple guide rollers that are in contact with the running paper on the paper ejection side than the printing section are rotated so that their circumferential speed is different from the speed of the running paper. This is a guide roller cleaning method that wipes away dirt with paper.

Here, "with the regular back tension applied" means:
In particular, this means that the back tension should not be weakened during this cleaning operation. Further, it is preferable that the application of the cleaning liquid is carried out in a plurality of times, and the means for applying the cleaning liquid and the means for rotationally driving the guide roller are completely arbitrary.

[Operation] Set the rotary printing press to slow operation mode (operate at a safe, slow speed in order to inspect and adjust each part of the printing press), and apply cleaning liquid to the running paper.

The traveling paper moistened with the cleaning liquid reaches a guide roller on the paper ejection side from the printing section. When this guide roller is rotated at a circumferential speed different from the speed of the running paper, the running paper slips on the surface of the guide roller, and the attached and hardened ink is dissolved by the cleaning liquid contained therein. After that, since the dry part (to which no cleaning liquid is attached) comes into sliding contact with the guide roller, the dissolved ink, etc. is transferred to the running paper. Since the surface is maintained in an extremely smooth state by the above methods, the slippage of 1η can be removed extremely easily by the slippage of the running paper.

[Example] FIG. 1 is a conceptual diagram showing an example of a guide roller cleaning device suitable for carrying out the method of the present invention.

This apparatus is comprised of a cleaning liquid coating device 30, a plurality of guide roller drive mechanisms 32, a control section for controlling the operation of these, an operation panel, a cleaning liquid tank (all not shown), and the like.

The cleaning liquid application device 30 is attached to the paper feed side of the printing unit 16 of the rotary printing press (for example, at the lower part of the arch in front of the blanket cylinder denoted by reference numeral A in FIG. 2). This cleaning liquid application device 30 includes a cleaning liquid tank 36 that holds a cleaning liquid 34,
It consists of a fantine roller 38 that rotates with its lower part immersed in it, a coat roller 42 that is swingable by an arm 40 so that it can simultaneously approach and separate from both the running paper 22 and the fantine roller 38. The mounting guide roller drive mechanism 32 is a motor attached to each guide roller 26 on the paper ejection side than the printing section 16,
For example, a gear portion 44 is formed at the end of the guide roller 26, and the transmission gear 46 that meshes with the gear portion 44 is driven by a motor ( The gear part 44 and the transmission gear 46 are attached to a rotating shaft (not shown) and swung by the arm 52 so that the gear part 44 and the transmission gear 46 can be engaged with each other and separated from each other. Such a guide roller drive mechanism 32 is attached to each guide roller 26 (especially 4 to 6 guide rollers immediately after the blanket cylinder) on the paper discharge side than the printing section 16.

In addition, in this device, as shown in FIG. 1, a rotation sensor 5 is provided near the guide roller 26 to detect the presence or absence of rotation thereof.
6 is attached, but it is not necessary.

A drag roller for running the paper is provided within the folding machine or just before it. If the pinch roller, which supports the running paper with pressure between it and the drag roller, has insufficient pressure, or if the pressure is only in a small area, apply sufficient pressure over the entire axial length of the drag roller. The structure should be designed so that it can be firmly compressed, and it should be improved so that strong tensile force can be applied evenly over the entire width of the running paper.

The present invention is carried out as follows in a zero-wheel printing machine, in which paper is threaded through the machine, and the running paper is pulled by a drag roller in or near the folding machine while being subjected to a regular back tensile run by the paper feed section 20 to perform slow operation. The bank tension run during the normal operation by the paper feed section 20 is about 10 to 20 kg, and the running paper is pulled by the drag roller and pinch roller, and resists the frictional force between the back tension run and the guide roller. You will have to drive with it.

Next, the coat roller 42 is swung to bring its surface into contact with the fantine roller 38 and the running paper 22. Then, the cleaning liquid 34 in the cleaning liquid tank 36 is transferred to the fan tin roller 3B.
As the coating material rotates, it is carried along the surface thereof, and can be applied to the running paper 22 via the coating roller 42. coat roller 4
The oscillating operation in step 2 is performed intermittently over several times depending on the dirt condition of the guide roller 26, and in the beginning, the application time is increased or the application time is changed between one application operation and the next application operation. It is desirable to make the time interval shorter at the beginning and longer at the end.

Note that since a petroleum-based solvent is generally used as the cleaning liquid, the tensile strength is unlikely to decrease even when applied to printing paper.

The running paper with the cleaning liquid attached will eventually reach the dirty guide roller 2.
Reach 6. A large number of guide rollers 26 are incorporated, and generally the guide rollers used differ depending on printing conditions.

In other words, the running paper does not always follow a fixed route, but the running route is determined by selecting a guide roller according to the printing conditions etc. The 0 rotation sensor 56 detects whether or not the guide roller 26 is rotating. It is determined whether the guide roller is Regarding the guide roller 26 to be cleaned (currently in use), the transmission gear 46 is engaged with the gear portion 44 of the guide roller, and the guide roller 26 is rotated at an appropriate speed by driving the motor. Since the speed is slow, about 15 to 2 orp, since the motor is running slowly, there is no problem even if the transmission gear 46 is suddenly engaged with the gear portion 44. All you have to do is rotate the guide roller 26 so that
It may be faster or slower than the running paper 22, and therefore may be rotated forward or reverse.

The adhering ink is dissolved by contact with the running paper 22 containing the cleaning liquid, and the next dry part of the running paper wipes off the dirt.

When the cleaning liquid is applied to the running paper 22 in several parts, the wet and dry parts alternately slide against the guide roller, leaving only a smooth surface that has been polished and chrome plated. Dirt can be wiped off very easily. When the wiping operation is completed, the transmission gear 46 is returned to its original position, and the guide roller 26 returns to a freely rotatable state and rotates at the speed of the running paper.

Although a preferred embodiment of the present invention has been described above in detail, it is a matter of course that the present invention is not limited to only such a configuration. It is preferable to apply the cleaning liquid on the paper feed side rather than the printing section as in the above example, but depending on the printer, it may also be placed on the paper ejection side rather than the printing section. Place it closer to the paper feed side than the dirty (used) guide roller.

The cleaning liquid may be applied by any method, for example, as shown in FIG.
The cleaning liquid may be applied by direct spraying, or the cleaning liquid may be applied not only from one side but also from both sides of the running paper.The timing and amount of application of the cleaning liquid may be adjusted as appropriate depending on the degree of dirt. Furthermore, the configuration for rotating each guide roller at an appropriate speed can be changed as appropriate. It is not necessarily necessary to rotate continuously, and rotation and stop may be repeated intermittently.

[Effects of the Invention] As described above, the present invention applies a cleaning liquid to the running paper and wipes off dirt by rotating a plurality of guide rollers on the paper ejection side than the printing section at a speed relative to the running paper. Because of its structure, it is relatively simple in terms of equipment, does not require much space, and can be easily incorporated into existing rotary printing presses. Above all, it eliminates the need for manual wiping work inside the narrow and intricate rotary printing press. It has an excellent effect.

In addition, with the present invention, since the paper remaining after the brush can be used for cleaning, there is no need to take the trouble of attaching a non-woven fabric for cleaning, and there is no need for complicated work such as weakening the back tensile strength. This has extremely excellent effects in terms of improving quality, shortening cleaning time, and improving work safety.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing an example of a guide roller cleaning device suitable for implementing the present invention, FIG. 2 is a partial explanatory diagram showing the schematic configuration of a rotary printing press, and FIG. 3 is a conceptual diagram showing an example of a guide roller cleaning device suitable for implementing the present invention. It is an explanatory diagram showing an example. lO...Printing unit, 16...Printing section, 20...
・Paper feeding unit, 22... Running paper, 24.26... Guide roller, 30... Cleaning liquid coating device, 32... Guy,
Troller drive mechanism, 42... Coat roller, 46...
・Transmission gear. Patent Applicant Ninka Co., Ltd. Managing Director Shigeru Minoru Figure 1

Claims (1)

[Scope of Claims] 1. Thread the paper through the rotary printing machine, operate it slowly with regular back tension applied to the paper feed section, apply cleaning liquid to the running paper to moisten it, and eject the paper from the printing section. Guide roller cleaning for a rotary printing press, characterized in that a plurality of guide rollers that are in contact with the running paper on the side are rotated so that their circumferential speed is different from the speed of the running paper, and dirt is wiped off by the running paper. Method. 2. The method according to claim 1, wherein the cleaning liquid is applied in multiple steps.