JP2004299260A - Ink feeding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink feeding apparatus capable of forming an ink film with a uniform film thickness over the whole outer periphery of a form roller. <P>SOLUTION: An ink fountain 5 is formed between apex faces of a pair of side plates 3 provided on both end parts of a bottom plate 1, the form roller 4 and the bottom plate 1. An agitating roller 14 which is freely rotatable at a specified interval between the form roller 4 is provided in an ink in the ink fountain 5, and the agitating roller 14 is rotated by bringing it into contact with the ink flowing by rotating the form roller 4 to reduce a pressure loaded on a contact part between the form roller 4 and a doctor blade 7 and to make the ink film formed on the outer periphery of the form roller 4 uniform. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an ink supply device for supplying ink onto a printing plate wound around the outer circumference of a plate cylinder.
[0002]
[Prior art]
A pair of side plates are provided at both ends of a bottom plate having an inclined upper surface, and the front side of the side plates is brought into contact with both ends of an ink forming roller as an ink roller, and an ink fountain is provided between the ink forming roller and the bottom plate. The ink filled in the inside is adhered to the outer circumference of the ink forming roller which is rotated in one direction, and the adhered ink is scraped off with a doctor blade to adjust the ink film thickness. 2. Description of the Related Art An ink supply device for transferring a printing plate to a printing plate on a plate cylinder opposed to a printing plate has been conventionally known.
[0003]
In the above-described ink supply device, when the ink supply roller is rotated to transfer the ink onto the printing plate, the ink that contacts the ink supply roller flows toward the contact portion between the ink supply roller and the doctor blade. , A pressure is applied to the contact portion.
[0004]
By the way, in the conventional ink supply device, since the contact area between the ink forming roller and the ink is large, the flow rate of the ink flowing toward the contact portion between the ink forming roller and the doctor blade due to the contact with the ink forming roller is high, A relatively large pressure is applied to the contact portion.
[0005]
At this time, the contact pressure between the inking roller and the doctor blade is rarely uniform over the entire length of the inking roller in the axial direction due to problems in processing accuracy of the two parts, and the contact pressure is strong due to the load of the pressure. In some areas, the amount of ink passing is small, while in areas where the contact pressure is weak, the amount of ink passing increases, and the thickness of the ink adhering to the outer periphery of the ink forming roller becomes uneven, resulting in uneven density in printed matter. There was an inconvenience.
[0006]
In order to eliminate such inconvenience, a shielding plate extending between the pair of side plates is provided in the ink fountain so that the lower end thereof is close to the outer periphery of the ink forming roller, so that the contact area of the ink with the ink forming roller can be reduced. The applicant of the present application has already proposed an ink supply device which aims to make the ink film adhered to the outer periphery of the ink forming roller uniform by reducing the pressure applied between the contact portion of the ink forming roller and the doctor blade. (See Patent Document 1).
[0007]
[Patent Document 1]
JP 2001-212938 A
[Problems to be solved by the invention]
By the way, in the ink supply device described in Patent Document 1, since the contact area between the ink forming roller and the ink is small, the ink in the ink fountain is less likely to be agitated by the rotation of the ink forming roller, and the flow of the ink is small. The surface of the ink becomes uneven between the high and low ink consumption areas, and as the remaining ink quantity decreases, the ink film becomes thinner in the high ink consumption areas and becomes uniform on the outer circumference of the ink application roller. There is a possibility that a thick ink film cannot be formed.
[0009]
In addition, the presence of the shielding plate makes it difficult to clean the ink fountain after the printing operation.
[0010]
SUMMARY OF THE INVENTION An object of the present invention is to provide an ink supply device that can easily form an ink film having a uniform thickness on the outer periphery of an ink roller and that can be easily cleaned.
[0011]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, a bottom plate having an inclined upper surface, a pair of side plates provided at both ends of the bottom plate, and an ink forming an ink fountain between the bottom plates between the side plates. In an ink supply device comprising a roller and a doctor blade for adjusting a film thickness of ink adhering to the outer periphery of the ink roller between the outer periphery of the ink roller and a facing portion of the tip of the bottom plate, the ink roller includes: In this configuration, a rotatable stirring roller is provided which is arranged substantially parallel to the ink roller and rotates by contact with ink flowing in the circumferential direction of the roller by the rotation of the ink roller.
[0012]
According to the above configuration, the ink that comes into contact with the ink roller flows toward the contact portion between the ink roller and the doctor blade due to the rotation of the ink forming roller, and the stirring roller rotates by contact with the flowing ink. Therefore, the force of the ink flowing toward the contact portion between the ink roller and the doctor blade is weakened, and the pressure applied to the contact portion is reduced, so that the ink film having a uniform thickness is formed on the outer periphery of the ink forming roller. Can be formed.
[0013]
In addition, since the ink in the ink fountain is agitated by the rotation of the agitating roller, it is possible to suppress a decrease in the fluidity of the ink, and to prevent a level difference from occurring on the ink surface in a portion where the ink consumption is large and a portion where the ink consumption is small. Thus, even when the amount of remaining ink is reduced, a uniform ink film can be formed on the outer periphery of the ink roller.
[0014]
In the ink supply device according to the present invention, a guide groove extending from a rear end to a front end of the side plate and a locking recess at a front end of the guide groove are provided on opposed inner surfaces of the pair of side plates, and both ends are formed by the guide groove. Parts are supported, one end of a pair of arms is fixed to an arm support shaft held in a stopped state by engagement with the locking recess, and the stirring roller is rotatably supported at the other end of each arm, The side plate prevents the arm from swinging toward the ink roller while the arm support shaft is engaged with the locking recess, and holds the stirring roller in a state where a predetermined gap is formed between the side plate and the ink roller. By providing the stopper, the arm support shaft can be pulled out from the opening end of the guide groove, so that the stirring roller can be taken out of the ink fountain, and the ink fountain can be removed from the ink fountain after the printing operation is completed. It can be easily cleaned.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the upper surface of the bottom plate 1 is an arc-shaped inclined surface 2, and the front side surfaces of a pair of side plates 3 provided at both ends of the bottom plate 1 are formed by an ink forming roller 4 as an ink roller. An ink fountain 5 is provided between the bottom plate 1 and the ink forming roller 4 between the pair of side plates 3 so as to contact the outer periphery of both ends.
[0016]
A doctor blade 7 is provided between the bottom plate 1 and a support 6 for supporting the same. The doctor blade 7 is opposed to the outer periphery of the ink forming roller 4 with a small gap therebetween, and comes into contact therewith to adjust the film thickness of the ink adhering to the outside of the ink forming roller 4. This ink film is transferred to a printing plate (not shown) on the plate cylinder 8 brought into contact with the ink forming roller 4.
[0017]
A guide groove 9 extending from the rear end to the front end of the side plate 3 is formed on the opposing inner surfaces of the pair of side plates 3. A first locking recess 10 is formed at the front end of the bottom surface of the guide groove 9, and a second locking recess 11 is provided at the rear end of the bottom surface, and both ends are formed by the first locking recess 10. The supported arm support shaft 12 is movable along the guide groove 9 and can be freely inserted and removed from an opening at the rear end of the guide groove 9.
[0018]
One end of a pair of arms 13 is fixed to both ends of the arm support shaft 12, and both ends of the stirring roller 14 are rotatably supported by the other ends of the pair of arms 13.
[0019]
On the inner surface of the side plate 3, a first stopper 15 is provided on a lower side of the first locking recess 10, and a second stopper 16 is provided on a lower side of the second locking recess 11. One end of the arm 13 contacts the first stopper 15 in a state where both ends of the arm support shaft 12 are supported, and the arm 13 is held in an inclined state by the contact, and the stirring roller 14 is moved to the ink fountain. The ink storage roller 5 is disposed at the bottom of the stored ink, and is maintained at a predetermined distance from the ink forming roller 4.
[0020]
When the arm 13 moves the arm support shaft 12 toward the open end of the guide groove 9, the arm 13 comes into contact with the second stopper 16 as shown by a chain line in FIG. When the arm 13 is rotated upward in the contact state, both ends of the arm support shaft 12 are fitted into the second locking recesses 11.
[0021]
In addition, the stopper surface 13a provided at one end of the arm 13 is brought into contact with the second stopper 16 in a state where both ends of the arm support shaft 12 are supported by the second locking concave portion 11, so as to be shown in FIG. Thus, the arm 13 can be locked and held with the stirring roller 14 pulled up.
[0022]
Now, for example, both ends of the arm support shaft 12 are supported by the first locking recess 10, and one side of the arm 13 abuts on the first stopper 13, and the stirring roller 14 is contained in the ink filled in the ink fountain 5. When the inking roller 4 is rotated in the direction of the arrow in FIG. 1 while the ink is immersed, the ink adhering to the outer periphery of the inking roller 4 is scraped off by the doctor blade 7 to adjust the film thickness of the ink. The image is transferred to a printing plate wound around the outer periphery of the cylinder 8.
[0023]
When the ink is supplied as described above, the ink in the ink fountain 5 flows toward the contact portion between the ink forming roller 4 and the doctor blade 7 by contact with the ink forming roller 4, and is stirred by the contact with the flowing ink. The roller 14 rotates.
[0024]
As described above, a part of the kinetic energy of the ink flowing due to the contact with the ink forming roller 4 is consumed by the energy for rotating the stirring roller 14, and thus flows toward the contact portion between the ink forming roller 4 and the doctor blade 7. The speed of the moving ink will be reduced. For this reason, the pressure applied between the inking roller 4 and the doctor blade 7 is reduced, and an ink film having a uniform film thickness can be formed on the outer periphery of the inking roller 4 by reducing the pressure. .
[0025]
In addition, the rotation of the stirring roller 14 stirs the ink in the ink fountain 5, and the stirring reduces a decrease in the fluidity of the ink. For this reason, the ink in the portion where the ink consumption is small flows smoothly to the portion where the ink consumption is large, and an ink film having a uniform film thickness is formed on the entire outer periphery of the ink forming roller 4 even when the ink storage amount is small. can do.
[0026]
Although not shown in the drawings, the position of the bottom plate 1, the pair of side plates 3 and the base 6 as a whole can be freely adjusted with respect to the inking roller 4, and by adjusting the position, the contact pressure of the doctor blade 7 with respect to the inking roller 4 can be reduced. It can be adjusted.
[0027]
After the end of the printing operation, after the remaining ink in the ink fountain 5 is collected, the arm 13 is rotated upward around the arm support shaft 13 and the rotatable stirring roller 14 supported by the arm 13 is moved to the position shown in FIG. As shown in (2), the agitating roller 14 is brought into contact with the upper portion of the outer periphery of the inking roller 4 and the stirring roller 14 is rotated by the rotation of the inking roller 4 to transfer the ink on the outer periphery of the agitating roller 14 to the inking roller 4 and remove it.
[0028]
On the other hand, the ink on the outer periphery of the ink setting roller 4 is scraped off with a scraper or wiped off with a cloth.
[0029]
When cleaning the inner surface of the ink fountain 5 or wiping the ink, the arm support shaft 12 is moved along the guide groove 9, and the arm support shaft 12 is engaged with the second locking recess 11 as shown in FIG. Then, the stirring roller 14 is held in a pulled-up state by the engagement of the stopper surface 13 a with the second stopper 16, or the arm support shaft 12 is pulled out from the opening at the rear end of the guide groove 9, and the arm support shaft 12, the arm 13 and The assembly of the stirring roller 14 is removed.
[0030]
By removing the assembly, a large space can be secured on the ink fountain 5, so that operations such as cleaning can be easily performed.
[0031]
【The invention's effect】
As described above, in the present invention, the stirring roller is rotated by the contact with the ink flowing by the rotation of the ink roller, so that the pressure applied to the contact portion between the ink roller and the doctor blade is reduced. Thus, an ink film having a uniform thickness can be formed over the entire outer periphery of the ink roller.
[0032]
Further, since the ink in the ink fountain can be agitated by the rotation of the agitating roller, a decrease in the fluidity of the ink can be suppressed. For this reason, the ink can flow smoothly to the portion where the ink consumption is large, and even if the amount of the ink remaining in the ink fountain decreases, an ink film having a uniform film thickness is formed on the outer periphery of the ink roller. Can be.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of an ink supply device according to the present invention. FIG. 2 is a partially cutaway plan view of FIG. 1. FIG. 3 is a cross-sectional view showing a state where a stirring roller is brought into contact with the outer periphery of an ink forming roller. FIG. 4 is a sectional view showing a state in which the stirring roller is lifted from the ink fountain.
1 bottom plate 3 side plate 4 ink application roller (ink roller)
5 ink fountain 7 doctor blade 9 guide groove 10 first locking recess 12 arm support shaft 13 arm 14 stirring roller 15 first stopper

Claims (2)

A bottom plate having an inclined upper surface, a pair of side plates provided at both ends of the bottom plate, an ink roller forming an ink fountain between the side plate and the bottom plate, and an outer periphery of the ink roller and a front end of the bottom plate facing each other. A doctor blade for adjusting the film thickness of ink adhering to the outer periphery of the ink roller between the parts, wherein the ink roller is disposed in the ink fountain substantially parallel to the ink roller, and is rotated by rotation of the ink roller. An ink supply device comprising a rotatable stirring roller that rotates by contact with ink flowing in a roller circumferential direction. On the opposing inner surfaces of the pair of side plates, a guide groove extending from the rear end to the front end of the side plate, and a locking recess at the front end of the guide groove are provided. One end of a pair of arms is fixed to an arm support shaft which is held stopped by engagement, the stirring roller is rotatably supported at the other end of each arm, and the side plate has an arm support in a locking recess. 2. A stopper according to claim 1, further comprising a stopper for preventing the arm from swinging toward the ink roller when the shaft is engaged, and holding the stirring roller in a state where a predetermined gap is formed between the arm and the ink roller. Ink supply device.

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