JPH025582B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ink roller cleaning device for a printing device.

[Prior Art] In a printing device, when printing is completed or when ink color is changed, it is necessary to remove ink adhering to each roller of the inking device that conveys ink from the pot roller to the plate surface.

Traditionally, ink roller cleaning in offset printing presses involves rotating a series of rollers in the inking unit while disconnected from the printing plate and pot rollers.
In this state, spray the cleaning liquid from the nozzle onto the first oscillating roller and the rolling-in side of the kneading roller, and wash each roller surface with the cleaning liquid. This is done by scraping off the ink and cleaning fluid. Note that a large number of nozzles are arranged along the axial direction of the roller, so that the cleaning liquid is supplied over the entire length of the roller.

[Problems to be Solved by the Invention] In this cleaning operation, if too much cleaning liquid is supplied, slips will occur between the first swinging roller and the kneading roller, making it impossible to perform effective cleaning. Therefore, conventionally, cleaning is performed by reducing the amount of cleaning liquid supplied. In other words, the inking rollers, mixing rollers, etc. of the printing press's inking rollers are not driven, but are rotated together by frictional force, and there is a slight touch pressure that allows just the right amount of ink to land on the rollers. When this cleaning liquid is supplied to these rollers, this liquid acts as a lubricant, reducing the frictional force and causing the roller slip phenomenon.

However, if the amount of cleaning liquid supplied is small, the cleaning effect will be low and cleaning will take time. Further, even if the amount of cleaning liquid is reduced, it is not necessarily possible to completely prevent the occurrence of slips, and the reliability of cleaning is also low.

On the other hand, when the supply amount of cleaning liquid becomes less than a certain amount,
There is also a possibility that the friction between the doctor blade and the roller with which the doctor blade is in contact becomes too large, causing damage to the doctor blade and the roller.

[Means for Solving the Problems] The present invention solves the above-mentioned problems, provides a cleaning device with high cleaning efficiency for ink rollers, and prevents damage to the doctor blade and the rollers that come into contact with it. An ink device that sprays cleaning liquid from a nozzle onto one roller near the pot roller of an inking device that has a series of rollers that receive ink from the pot roller and supply ink to the plate surface to remove ink that adheres to each roller. In roller cleaning, the nozzles are divided along the axial direction of the roller and arranged in large numbers to form at least two groups, and when spraying the cleaning liquid, they are sprayed alternately and intermittently for each group except for the final time. The cleaning liquid is repeatedly sprayed multiple times. Further, ink and cleaning liquid adhering to the roller near the plate surface are recovered by a doctor blade that comes into contact with the roller after the roller surface is sufficiently wetted with the cleaning liquid.

[Function] The present invention provides an ink roller cleaning device for an inking device configured as described above, so that two or more groups divided along the axial direction of one roller near the pot roller are used. Cleaning liquid is sprayed from multiple nozzles repeatedly and alternately and intermittently for each group, except for the last time, and the cleaning effect is enhanced on the areas where the cleaning liquid is sprayed, while the areas that are not sprayed are cleaned. It has frictional force and does not cause slips.

In addition, after the cleaning liquid reaches the roller that the doctor blade contacts, the doctor blade comes into contact with the peripheral surface of the roller, so the area between the doctor blade and the roller is always sufficiently wet when they make contact. , the friction between the two will not become too large.

[Example] The present invention will be explained below with reference to Examples.

FIG. 1 is a schematic front view showing the main parts of a cleaning device for an inking device according to an embodiment of the present invention, FIG. 2 is an explanatory view showing the cleaning liquid spraying state, and FIG. 3 is a timing chart of each part.

In this example, an offset inking device is shown. As shown in FIG. 1, the inking device 1 consists of a large number of roller groups.
After receiving the ink 4 from the plate and making it uniform, the ink 4 is supplied to the plate surface 6 of the plate cylinder 5. That is, the ink 4 of the pot roller 3 is supplied to the first swinging roller 7 of the roller group by the feeding roller 8. The calling roller 8 is the fulcrum 9
It is rotatably supported at the tip of a lever 10 that swings around , swings to the left and contacts the pot roller 3 to receive ink 4 from the pot roller 3, and swings to the right to transfer the ink to the calling roller 8. The ink 4 adheres to the circumferential surface and is supplied by bringing it into contact with the swinging roller 7.

A kneading roller 11 is in contact with the swinging roller 7, and a distribution roller 12 is in contact with the kneading roller 11. Two transfer rollers 13 are in contact with the distribution roller 12, and each transfer roller 13 has an oscillating roller 1.
4 and 15 touch. In addition, these swing rollers 1
4 and 15 have one or two ink forming rollers 1
6 to 18 are in contact. Each ink forming roller 16
to 18 respectively come into contact with the plate surface 6 on the outer peripheral surface of the plate cylinder 5.

Further, as a cleaning device, a winding part (not necessarily a winding part, but this part is most effective) where the swinging roller 7 and kneading roller 11 contact each other.
A nozzle 20 is provided for spraying a cleaning liquid 19 onto the cleaning liquid 19. As shown in FIG. 2, four nozzles 20, 20a to 20d, are arranged along the axial direction of the kneading roller 11, and two each are attached to separate cleaning liquid pipes 21 and 22. There is. Solenoid valves X1 and X2 are separately attached to both cleaning liquid pipes 21 and 22, respectively, and when the solenoid valve X1 is turned on, the two nozzles 20 on one side are
The cleaning liquid 19 is injected from a and 20b, and the solenoid valve
The other two nozzles 20c and 20d are turned ON when
The cleaning liquid 19 is sprayed from the inside. These nozzles 20a to 20d inject cleaning liquid alternately (alternately) in two groups by alternately and intermittent ON operation of electromagnetic valves X1 and X2, as shown in the timing chart of FIG.

Further, a container 24 having a doctor blade 23 is provided as a recovery device for waste liquid (mixed liquid consisting of ink and cleaning liquid) in the cleaning device. This container 24 is moved backward (separated) during printing, but when the cleaning operation begins, it moves forward, bringing the doctor blade 23 at the tip into contact with the circumferential surface of the swinging roller 14 that contacts the ink forming roller 16, and swinging it. dynamic roller 1
The waste liquid 25 adhering to the circumferential surface of 4 is removed. Waste liquid 2
5 is housed in the container 24. Note that if the circumferential surface of the swinging roller 14 is not sufficiently wet, the circumferential surface of the swinging roller 14 will be damaged by contact with the doctor blade 23. Therefore, as shown in the timing chart of FIG. 3, the cleaning liquid 19 is injected from all the nozzles 20 of the doctor blade 23, and the cleaning liquid 19 that is sequentially transmitted through each roller is transferred to the swinging roller that the doctor blade 23 contacts. After time _t2 when the roller 14 reaches the circumferential surface of the roller 14, the roller moves forward and comes into contact with the swinging roller 14.

In such a structure, during printing, ink 4 is sequentially supplied to the plate surface 6 by the inking device 1;
When cleaning, the inking device 1 is connected to the pot roller 3 and plate surface 6.
cut off from Specifically, the calling roller 8 is brought into contact with the swinging roller 7 to break the contact with the pot roller 3, and the contact between the plate surface 6 and the inking device 1 is broken by shifting the positions of the inking rollers 16 to 18. . Thereafter, as shown in the timing chart of FIG. 3, each part is operated to clean each roller of the inking device 1. That is, at the cleaning start time t ₀ , each roller of the inking device 1 is cleaned for one cycle.
Rotate over T ₃ . The rotation speed of each roller during this cleaning is best at a circumferential speed of about 120 m/min in terms of cleaning efficiency; if it is too fast, the cleaning liquid will scatter, which is not preferable. Also, a group of nozzles 20
The solenoid valve X1 for opening and closing the valve that injects the cleaning liquid 19 from a and 20b is operated for only T ₁ hour from the cleaning start time t _0.
It is turned on and a large amount of cleaning liquid 19 is sprayed onto about half of the swinging roller 7 and kneading roller 11 along the axial direction. At this time, because a large amount of the cleaning liquid 19 adheres to the roller, about half of the roller will slip, but even if a small amount of cleaning liquid flows into the remaining half of the roller, this remaining area will slip. Since the frictional force is large in about half of the area, no slip occurs between the rollers 7 and 11. Therefore, the cleaning effect of about half the area to which the cleaning liquid is directly sprayed is much greater than in the past.

Next, after time t has passed after the one solenoid valve X1 is turned off, the other solenoid valve X2 is turned off for T ₁ hour.
The ON operation is performed to inject the cleaning liquid 19 from the other groups of nozzles 20c and 20d, and the other half of the swinging roller 7 and the kneading roller 11 are cleaned in the same manner as described above.
After repeating this cleaning operation (T ₂ ) for the second group of nozzles 20a to 20d several times (after times t ₃ and t ₄ ; the number of times is set as necessary), the time
After _t5 , turn on both solenoid valves X1 and X2,
Cleaning liquid 19 is sprayed from all nozzles 20a to 20d. At this time, the swinging roller 7 and the kneading roller 1
Even if a certain amount of slip occurs during this time, there is no problem because the cleaning is almost completed and the process is to uniformly remove the amount of cleaning liquid remaining on each roller. Note that control of the electromagnetic valves X1 and X2, the operating times and operating times of the doctor blades, etc., is carried out by a normal and appropriate sequence control circuit.

On the other hand, the doctor blade 23 is cleaned at time t ₂ after all the nozzles 20a to 20d have been cleaned once.
From the elapsed time until the elapse of time _t6 , which is before the elapse of the cleaning processing time _T3 , it is activated by a suitable timer mechanism or the like, moves forward and comes into contact with the swinging roller 14, and collects the waste liquid 25.

According to this embodiment, since a structure is adopted in which the cleaning liquid is sprayed alternately on each half of the roller, even if a large amount of cleaning liquid is sprayed to efficiently clean one half of the roller, the frictional force of the other half is The roller continues to rotate. Therefore, this method of cleaning the roller halves alternately provides efficient cleaning. Note that since a large amount of cleaning liquid is similarly supplied to each roller that is linked to the kneading roller, all the rollers can be cleaned in a short time. Further, the settings of each of the above-mentioned times are appropriately set depending on the number and arrangement of the rollers constituting the inking device 1, and in this embodiment, _T1 is set to 0.5 seconds and _T2 is set to 10 seconds. Good results were obtained.

The present invention is not limited to the embodiments described above, but can be modified based on the technical idea of the present invention. For example, the nozzles may be divided into more groups, and the cleaning liquid may be alternately ejected from the nozzles in several groups. Further, each time such as the cleaning liquid injection time may also be freely adjustable. Further, even when the cleaning liquid is manually supplied to the rollers, by using the method of the present invention, the cleaning work can be standardized and the working time can be shortened.

[Effects of the Invention] According to the present invention, an ink roller is axially divided along the axial direction of the roller, a group of nozzles corresponding to each divided portion is arranged, and each nozzle is injected into each portion in turn. Since cleaning liquid will be supplied,
While sufficient cleaning progresses in the areas where the cleaning liquid is supplied, other areas have less residual cleaning liquid, making it difficult for roller slippage to occur, which reduces the amount of cleaning liquid supplied at one time. As a result, the cleaning efficiency can be improved and the time required for cleaning can be shortened. Also,
Since the area between the doctor blade and the roller with which the doctor blade comes into contact is always wet with the cleaning liquid at the time of contact, the friction between the two will not become too large and cause damage to both.

[Brief explanation of drawings]

FIG. 1 is a schematic front view showing the main parts of a cleaning device for an inking device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the cleaning liquid injection state, and FIG. 3 is a timing chart of each operating part. . 1... Inking device, 3... Urn roller, 6... Print plate, 7
... Swinging roller, 8... Calling roller, 11... Kneading roller, 14, 15... Swinging roller, 16-18... Ink forming roller, 19... Cleaning liquid, 20a-20d... Nozzle, 21, 22... Cleaning liquid piping, 23... Doctor blade, X1, X2...Solenoid valve.

Claims (1)

[Scope of Claims] 1. An inking device having a series of rollers that receives ink from a pot roller and supplies ink to a plate surface; a nozzle that injects a cleaning liquid to a roller near the pot roller; In an ink roller cleaning device having a doctor blade that contacts the roller and collects ink and cleaning liquid adhering to the roller, a large number of the nozzles are arranged so as to be divided into at least two groups along the axial direction of the roller. An ink roller cleaning device characterized in that each group of nozzles has a solenoid valve that injects cleaning liquid alternately except at the final time. 2. The ink roller cleaning device according to claim 1, wherein the doctor blade is arranged so as to be able to approach and separate from the corresponding roller.