JP2006159880A - Apparatus for cleaning cylinder of printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for cleaning a printing cylinder in which cleaning effect is not lowered by keeping a degree of cleaning of a roll brush. <P>SOLUTION: A scraper 3 is made into a round rod shape, and a process for cleaning the scraper is provided in a self-cleaning process for the brush 2. In the scraper cleaning process, the degree of cleaning of the scraper is held by a method wherein while the scraper with a round rod shape is rotated, the whole region of the surface of the scraper is rubbed with the brush containing a cleaning liquid through a unidirectional clutch or a unidirectional bearing 20 capable of transmitting rotation only when the brush is reversely rotated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a printing cylinder cleaning device in a printing press.

  A conventional cylinder cleaning device for a printing press using a roll brush has a nozzle that sprays the cleaning liquid facing the roll brush, sprays the cleaning liquid onto the roll brush to moisten it, and rubs the cleaning liquid against the cylinder surface by rotating the roll brush. The surface of the printing cylinder is cleaned by a method of swelling or dissolving the adhering ink or paper powder and scraping it off. In the cleaning device, a scraper is pressed against the roll brush, and ink and paper dust stains scraped from the printing cylinder and adhering to the roll brush are collected in a drain pan together with a contaminated cleaning solution by cleaning the cylinder. It is made like that.

  The cleaning principle of such a conventional apparatus requires that the roll brush be kept clean. More specifically, in this method, since the roll brush rubs the surface of the printing cylinder and the dirt substance on the cylinder surface is transferred to the brush repeatedly by rotation, the contamination state of the brush is determined by the printing cylinder. The dirt on the surface of the printing cylinder is scraped off by the brush until it is equal to the contamination level of the ink.However, when the dirt on the brush is equal to the dirt on the printing cylinder, the dirt on the surface of the printing cylinder is kneaded with dirt. If there is more dirt than the printing cylinder, the printing cylinder is smeared. That is, the ability of the brush to scrape dirt material from the print cylinder is inversely proportional to the degree of dirt on the brush, so it is clear that the function of cleaning the print cylinder depends on the condition of the brush being less dirty. Therefore, in the roll brush type cylinder cleaning device, it is necessary to scrape off the dirt adhering to the brush with a scraper, and the brush is separated from the printing cylinder before and after cleaning and as a self-cleaning step of the brush as appropriate during cleaning. There is a need to keep the brush clean by scraping off dirt substances adhering to the brush by a scraper by a method of spinning idly by forward rotation and reverse rotation while spraying the cleaning liquid.

In recent years, as production companies have been striving to reduce environmental pollution caused by industry, paper used for printing has been changed to recycled paper, and oleophilic solvents have been replaced with oleophilic cleaning liquids with low environmental pollution. Measures have been taken. For this reason, a decrease in paper quality increases the paper dust contamination of the printing cylinder, and the lipophilic cleaning liquid with a low environmental pollution level has insufficient cleaning power, increasing the number of cleanings and extending the spraying time of the cleaning liquid. Countermeasures such as stopping spraying of cleaning liquid and increasing the time to scrape, development of emulsion type cleaning agent supplemented with hydrophilic cleaning components, switching between lipophilic cleaning liquid and hydrophilic cleaning liquid, etc. Various measures have been studied and implemented. However, there is still a result that the printing quality deteriorates due to the residue on the printing cylinder.
JP 2002-103570 A

  In a conventional printing cylinder cleaning device, the brush tip and scraper tip are rubbed together to scrape off brush contaminants and adhere to the scraper, both in the printing cylinder cleaning state and in the brush self-cleaning process. Contaminants are also poured into the drain pan along with the cleaning liquid. In this way, the tip of the roll brush is always kept cleaner than the dirt on the blanket surface.

  However, the scraper has a portion that is not in contact with the brush, and in the portion that is not in contact with the brush, the contaminants are merely washed away by the flow of the cleaning liquid. For this reason, the ink adhering to the portion of the scraper that is not in contact with the brush and the pollutant consisting of paper dust gradually accumulate and become icicles during long-term use. The icicles caused by such contaminants will eventually grow thick and long, reducing the ability of the contaminants to flow into the drain pan with the cleaning liquid, necessitating a longer time for brush self-cleaning to clean the brush. . In addition, in order to maintain the function of the printing cylinder cleaning device, it is necessary to perform maintenance work such as periodically cleaning the scraper.

  In the maintenance work described above, the scraper inside the cylinder cleaning device attached to the narrow part of the printing press is wiped away by hand, or the heavy cleaning device is removed from the space of the narrow printing press so as not to damage the printing press. There are operations that require skill such as cleaning, workability is poor, ink stains adhere to the hands and the periphery, and problems such as paper stains immediately after the start of printing occur.

  In recent years, with the diversification and spread of information, the price of information provision has been drastically reduced and printing costs have also been affected. Therefore, there has been a strong demand for reducing the cost of printing cylinder cleaning devices and running costs related to cleaning. It has become. That is, it is desired to shorten the time required for maintenance and extend the maintenance interval.

  In the present invention, as a means for extending the maintenance interval of the cleaning device and consequently reducing the running cost, the scraper having a square cross section which has been conventionally used is formed into a round bar shape, and the process of cleaning the scraper in the self-cleaning process of the brush Is provided. In the scraper cleaning process, the entire surface of the scraper is rubbed with a brush containing cleaning liquid while rotating the round bar-shaped scraper via a one-way clutch or one-way bearing that can transmit rotation only when the brush is reversed. Therefore, it was possible to keep the scraper clean and to prevent the scraper from deteriorating, to reduce the number of maintenances and to shorten the brush self-cleaning time.

  FIG. 1 (A) shows a state where the cleaning device according to the present invention is cleaning the printing cylinder, and FIG. 1 (B) shows a state where the cleaning device according to the present invention is cleaning the roll brush and the scraper. In the figure, 1 is the surface of the printing cylinder, 2 is a roll brush, 3 is a round bar-shaped scraper, 4 is a nozzle for spraying a cleaning liquid, 5 is a drain pan for collecting ink and paper dust scraped off by the scraper, and 6 is A motor for rotating the brush, 7 is a pressing metal for determining the position of the scraper, 8 is a fixing metal for fixing the position of the pressing metal, and 9 is for moving the cleaning device between the printing cylinder cleaning state, the brush self-cleaning state, and the scraper cleaning state. The arrow 10 indicating the moving direction is the rotation direction of the printing cylinder, the arrow 11 is the rotation direction of the roll brush in the printing cylinder cleaning state and the brush self-cleaning state: normal rotation, and 12 is the rotation direction of the roll brush in the state of cleaning the scraper: Reverse rotation is shown respectively.

  FIG. 2 is a view for explaining the relationship between a round bar-shaped scraper and a roll brush. FIG. 2C shows a state where the printing cylinder is being cleaned, and FIG. 2D shows a state where the scraper is being cleaned. In the figure, 1 indicates the surface of the printing cylinder in a cleaning state where the brush is pressed, and 26 indicates the printing cylinder away from the brush when the cleaning unit is retracted in the case of brush cleaning and scraper cleaning. 2 shows a roll brush, 3 is a round bar-shaped scraper, 11 is a roll brush rotation direction in a printing cylinder cleaning state and a brush self-cleaning state: forward rotation, and 12 is a roll in a state of cleaning the scraper. Rotation direction of brush: reverse rotation, 13 is the direction of rotation of the scraper in the scraper cleaning state, 14 is the ink and paper dust stains that the scraper scrapes off from the brush during printing cylinder cleaning and self-cleaning of the brush, 15 is in the scraper cleaning state Dirt substance consisting of ink and paper dust accumulated in the scraper that flows down with the cleaning liquid. Schematic view showing a state in which a part of the accumulated icicles scraped ink and paper dust from a. Further, a is a distance between the brush and the scraper in the printing cylinder cleaning state and the brush self-cleaning state, and b is a diagram showing a distance between the brush and the scraper in the scraper cleaning state. The relationship between the distance values a and b is a <b. In the printing cylinder cleaning state (A), the scraper is strongly pressed against the brush, and the dirt substance and cleaning liquid scraped off the cylinder surface are squeezed out from the brush. The dirt flows off along the surface of the brush, and the brush bristles bounce off the dirt. On the other hand, in the state (b) in which the scraper is being cleaned, the scraper is lightly rubbed with a brush while rotating, and the ink and paper dust accumulated on the surface of the round bar is flowing down together with the cleaning liquid.

  FIG. 3 shows a rotating mechanism of a round bar scraper. In the figure, 2 is a roll brush, 3 is a round bar-shaped scraper, 5 is a drain pan that collects dirty substances and cleaning liquid consisting of dirty ink and paper dust, 6 is a motor that rotates the brush, and 17 is a motor that transmits rotation. Belt 18, a driving gear for rotating the scraper, 19 a one-way rotating gear for transmitting the rotation only when the roll brush reversely rotates, 20 a one-way rotating bearing for transmitting only one-way rotation, 21 for one-way An arrow indicating the rotation direction of the rotary gear, 22 is a scraper support mechanism having a function of pressing the scraper against the brush, and 23 is an air cylinder that moves the entire cleaning device back and forth.

  FIG. 4 shows a scraper support mechanism. In the figure, 3 is a round bar-shaped scraper, 7 is a pressing metal for determining the position of the scraper, 8 is a fixing metal for fixing the position of the pressing metal, and 7 is formed with a recess 25 for regulating the position of the scraper. In the figure, the depression between the pressing metal that determines the position of the scraper and the fixing metal that fixes the pressing metal is an ellipse when viewed from the side, the shape is inclined from the upper right to the lower left, and the upper right is wide. The lower left is a narrow shape, and when the round scraper is on the upper right, it can rotate, but the lower left is sandwiched between the curved surfaces so that it does not rotate. FIG. 4C shows the printing cylinder cleaning state and the brush self-cleaning state. Since the brush rotates in the direction indicated by the arrow 10 in FIG. 2, the round scraper has a direction indicated by the arrow 24. As a result, the scraper is pushed out along the curved surface 25 of the scraper presser 7, so that the scraper stops rotating with the space between the presser fitting 7 and the fixing bracket 8 being small and the scraper stops rotating. It is fixed with a large amount of bite. FIG. 4 (D) shows a state in which the scraper is being cleaned. By rotating the brush in the reverse direction, the one-way rotating gear 19 shown in FIG. 3 transmits the rotation of the brush to rotate the driving gear 18 to move the scraper to an arrow. The rotating direction of the scraper rotated in the direction of 13 is opposite to the direction in which the round bar-shaped scraper is fixed. The scraper moves while rolling along the curved surface 25 formed on the pressing metal 7, and the pressing metal 7 and the fixing metal As a result, the fixing force is released and the pressing force against the brush is weakened, and it becomes easy to rotate.

  The printing cylinder cleaning device according to the present invention is in a resting state because it is separated from the printing cylinder by the cylinder 23 when the rotary press is in a printing state. After the printing is finished, the printer is stopped and the crawling (low-speed rotation for maintenance etc.) is performed in the cylinder-extracted state (the printing plate is separated from the printing cylinder). The cylinder 23 is operated to move the cleaning device, and the roll brush is pressed against the printing cylinder to start cleaning.

  In the state of cleaning the printing cylinder, the roll brush 2 is pressed against the printing cylinder 1 as shown in FIG. 1A, and the ink and paper dust remaining on the surface of the printing cylinder are scraped off while rotating. The ink and paper powder scraped off by the roll brush are further scraped off by the scraper 3 pressed against the roll brush 2 and are washed down together with the cleaning liquid to the drain pan. In this state, the surface of the round bar of the scraper flows down from the lower part of the scraper together with the dirt substance consisting of ink and paper dust rubbed by the brush and the cleaning liquid contained in the brush, and is collected in the drain pan 5. Further, a part of the ink and paper powder adhering to the brush tip is collected in the drain pan as the splash 14 when the brush is bent and flipped by the scraper.

  Since the cleaning liquid containing contaminants such as ink and paper powder when cleaning the printing cylinder has a relatively high viscosity, when it flows down from the scraper, it drops into an icicle as shown at 16 in FIG. In one cleaning operation, the growth of the icicles is minute and does not hinder the flow of the contaminated liquid, so that the state in which the brush is less contaminated can be maintained. However, if cleaning is repeated for a long time without cleaning the scraper, the lower part of the scraper repeats the generation and drying of icicles, and the icicles grow and eventually take in the droplets 14 and as a result of further growth the cleaning solution This hinders the flow from the scraper and reduces the ability to scrape contaminants from the brush.

  Therefore, in the present invention, a round bar-shaped scraper that can be easily cleaned after each cleaning is employed, and a method of brushing while rotating the scraper has been devised as a method for cleaning the scraper. In detail, the entire cleaning device is moved back by the air cylinder 23, the brush is pulled away from the printing cylinder, and the brush is rotated and sprayed with the cleaning liquid for several seconds to several tens of seconds to perform self-cleaning of the brush. At the same time, while rotating the scraper in the shape of a round bar as shown in the rotation direction 12, the surface is rubbed with a brush sufficiently containing a cleaning agent, and the contaminant on the surface of the scraper is poured into the drain pan together with the cleaning agent. is there.

  In the state where the surface of the scraper is cleaned, the direction of rotation of the brush is the direction indicated by the arrow 11, and if the scraper is strongly pressed against the brush, the tip of the brush rubbing the scraper splashes the liquid and the cleaning machine Dirt substances such as ink and paper dust are scattered inside. Therefore, in the present invention, the rotation speed of the roll brush is lowered and the pressing amount of the scraper and the roll brush is reduced in the cleaning state of the scraper.

  The scraper is supported by a support device as shown in FIG. 4. When the scraper is cleaned, the brush rotates in the direction indicated by 11 in FIG. Move towards. The curves of the presser bracket 7 and the fixing bracket 8 are narrower in the lower left direction and wider in the upper right direction in the figure, and are fixed to the lower left narrow portion by the frictional force in the forward rotation direction of the roll brush when the printing cylinder is washed. However, at the time of cleaning the scraper, the right-hand rotation of the round bar-shaped scraper easily rolls off the surface formed in the depression of the presser fitting 7 and moves out of the fixed state due to the wedge effect and moves to the wide upper right part. By this movement, the round bar-shaped scraper moves to a wide portion between the pressing metal and the fixing metal, and can be easily rotated. At the same time, the biting into the brush is reduced, and the brush lightly rubs the surface of the scraper. Further, in the step of cleaning the scraper, the rotation speed of the brush is lowered, and the speed is adjusted so as not to scatter the stains made of ink and paper powder from the brush tips, and also the cleaning liquid.

  Conventionally, a bar-shaped scraper having a square or polygonal cross section is generally used, but in the present invention, a bar-shaped scraper having a round cross section is used. The effect of the round bar is: After rotating and cleaning, any surface can be pressed against the brush to perform the same function, so the fixed state only needs to be managed by the amount of biting into the brush. 2. 2. The surface of the round scraper can be cleaned while rotating, so that the entire surface can be easily cleaned. Combining with a support device that narrows one side to exhibit the effect of a wedge makes it easy to press against the wedge and fix or rotate to release the fixed state, and to specify the stop position of rotation 3. Since it is not necessary, fixing by the wedge effect is easy and reliable. The effect of the conventional scraper, which uses the method of removing the brush tips by repelling the tips at the corners of the square, requires that the brush rotation speed be increased to some extent, and the splash of cleaning liquid generated from the cleaning device will deteriorate the working environment. In the scraper having a round cross section of the present invention, the contaminants and cleaning liquid stored in the gap between the brushes are compressed and squeezed out when the high-density roll brush tip is pressed against the round bar. Large, evenly flowing on the surface close to the opposite side of the round bar brush, it is no longer necessary to increase the rotation of the brush even during the self-cleaning of the brush. Effective for improvement.

  Each time the printing cylinder cleaning device finishes cleaning the printing cylinder by the scraper cleaning method having the above-described structure, the scraper pressed against the roll brush starts the cleaning operation from a clean state every time. As a result, the roll brush can maintain the same level of dirt, and the cleaning performance can be kept high without frequent maintenance and cleaning work. The processing time was shortened, the running cost was reduced, and the efficiency of the plate change was improved.

  In the first embodiment, in order to simplify the explanation, a device in which a one-way rotary bearing, a one-way rotary gear, and a scraper holding mechanism are combined has been described. The method of making it possible is also possible. Further, the round bar-shaped scraper can be always rotated or arbitrarily rotated by another rotating method. Further, if the roll brush and the round bar-shaped scraper have a peripheral speed difference, the roll brush and the scraper do not stick to the direction of rotation.

  In the present invention, the purpose of moving the scraper is a supplementary means that prevents splashes from splashing into the apparatus during cleaning of the scraper. This purpose can also be achieved using other means. That is: 1. Prevent splashes from splashing by reducing the rotational speed of the brush sufficiently during scraper cleaning. 2. Change the gear ratio to change the peripheral speed of the scraper and roll brush, and rotate the roll brush in the normal direction to clean the scraper and change the splash direction to the drain pan. Increase the suction force of the suction device used as a drain pan waste liquid recovery method to suppress the occurrence of splashes by sucking ink or paper powder droplets in the printing cylinder cleaning device, etc. By using this method, the object of the present invention can also be achieved by a method of rotating the scraper with a round bar shape fixed.

  Therefore, in the second embodiment, the cross-sectional shape of the space formed between the pressing metal fitting and the fixing metal fitting in FIG. 4 is made to be a part of a circle of a size that allows the round bar-shaped scraper to rotate, and the scraper rotates even when fixed. When the scraper is not moved, the brush rotation speed is lowered, and the suction device discharge rate is increased to discharge the liquid containing ink and paper dust collected in the drain pan. Thus, the same effect as that of the first embodiment can be expected by the method of suppressing the scattering of the droplets and preventing the accumulation in the cleaning device by suction.

  In the present invention, as a means for extending the maintenance interval of the cleaning device and consequently reducing the running cost, the scraper having a square cross section which has been conventionally used is formed into a round bar shape, and the process of cleaning the scraper in the self-cleaning process of the brush Is provided. In the scraper cleaning process, the entire surface of the scraper is rubbed with a brush containing cleaning liquid while rotating the round bar-shaped scraper via a one-way clutch or one-way bearing that can transmit rotation only when the brush is reversed. Therefore, it was possible to keep the scraper clean and to prevent the scraper from deteriorating, to reduce the number of maintenances and to shorten the brush self-cleaning time. Further, the apparatus according to the present invention is a method for transmitting the reverse rotational force of the brush without providing special rotational power for rotating the scraper, and the cost of the apparatus can be kept low.

  In recent years, printing paper has been recycled as a countermeasure against resource depletion, and paper dust stains on blankets have increased. Therefore, there is an increasing demand for reducing the cost of the printing cylinder cleaning device and reducing the running cost for cleaning. Also, wipe the scraper inside the cylinder cleaning device attached to the narrow part of the printing press by hand, or remove the heavy cleaning device from the narrow printing machine space and clean it without damaging the printing press. The number of technicians who can perform skilled work is decreasing, and it is possible to provide a function sufficient to meet the strong demand for shortening the maintenance time and extending the maintenance interval.

  It is sectional drawing explaining the cleaning state and self-cleaning state of the cylinder cleaning apparatus of this invention.   It is a relationship diagram between a roll brush and a round bar-shaped scraper, and is a diagram for explaining a printing cylinder cleaning state and a state in which the brush and the scraper are self-cleaning.   It is a figure explaining the mechanism which transmits rotation of a brush with a unidirectional rotation bearing, and rotates a round bar-shaped scraper.   It is a figure explaining a scraper holding mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printing cylinder surface 2 Roll brush 3 Round bar-shaped scraper 4 Nozzle 5 which injects washing liquid Drain pan 6 Motor 7 which rotates brush 7 Pressing bracket which determines the position of scraper 8 Fixing bracket 9 which fixes the position of pressing bracket 9 Washing device whole 10 direction of rotation of the printing cylinder 11 direction of rotation of the brush: forward rotation 12 direction of rotation of the roll brush in the state of cleaning the scraper: reverse direction 13 direction of rotation of the scraper when cleaning the scraper 14 cylinder cleaning state and brush self Dirty substance 15 scattered from the brush tip bounced by the scraper in the cleaning state 16 Dirty substance 16 flowing down with the cleaning liquid in the scraper cleaning state 17 Icicle-like dirt substance flowing down from the scraper Belt 18 Drive gear 19 for rotating the scraper Rotating gear 20 Unidirectional rotating bearing 21 Rotating direction of unidirectional rotating gear 22 Scraper support mechanism 23 Air cylinder 24 Direction of force applied when roll brush rotates forward 25 Depression formed in pressing metal: curved surface 26 Virtual surface of printing cylinder

Claims (2)

    A nozzle that sprays the cleaning liquid facing the roll brush is arranged, the cleaning liquid is sprayed onto the roll brush to moisten it, and the cleaning liquid is rubbed against the cylinder surface by the rotation of the roll brush. In a printing cylinder cleaning device that collects the soiled material that has been swollen or dissolved and scraped off the roll brush with a scraper pressed against the roll brush together with the cleaning liquid into a drain pan, the scraper is removed using a round bar scraper. A printing cylinder cleaning device that enables self-cleaning of the scraper and roll brush while rotating.     2. The printing cylinder cleaning apparatus according to claim 1, wherein a one-way rotary bearing is mounted on a central axis of the roll brush, a gear is provided on an outer ring of the one-way rotary bearing, and meshed with a gear provided at an end of the scraper. , A printing cylinder cleaning device that rotates the scraper only when the roll brush reverses.

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