JP2004034485A - Liquid feeding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To decrease such streaks as a shock-streak and a repeat-streak caused by a step difference part of ink film thickness formed on the peripheral face of a forme roller. <P>SOLUTION: In the forme roller 9, a core part 91 made of a metal is provided at the center, and a rubber 93 formed in an approximately cylindrical shape is formed on the circumference of the core part 91. The diameter of the core part 91 is gradually changed in the axial line direction, and a plurality of large diameter parts 91a and small diameter parts 91b are alternately provided. The rubber 93 is formed so as to make the diameter of the outer peripheral face to be the same in the axial line direction. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid supply device that supplies liquid supplied from an upstream side to a plate cylinder via a setting roller.
[0002]
[Prior art]
The most typical liquid supply device of this type is an ink supply device of a printing press. As shown in FIG. 7, the ink supply device of this printing press is provided with a blade 1 and a fountain roller 2 and alternately switches between an fountain roller 4 in which ink 3 is stored and a fountain roller 2 and a kneading roller 5. It is composed of a call roller 6 that reciprocates while making contact, and an ink transfer roller group 7 provided downstream of the kneading roller 5. The ink transfer roller group 7 includes four ink forming rollers 9 in contact with the plate cylinder 8, a pair of oscillating rollers 10, 10 in contact with these ink forming rollers 9, and an upstream side of the oscillating rollers 10, 10. It comprises a kneading roller 11, a kneading roller 12 in contact with the kneading roller 5, and rider rollers 13, 13 in contact with the ink forming roller 9 and the kneading roller 11, respectively.
[0003]
Reference numeral 15 denotes a water supply device, which includes a water supply roller 17 rotating in a watercraft 16 and a transfer roller 18 rotating in the opposite direction to the water supply roller 17. A metering roller 19 rotating in the direction is in contact with the transfer roller 18, and a swimsuit roller 20 in contact with the plate cylinder 8 is in contact with the transfer roller 18. A rider roller 20a is in contact with the swimsuit roller 20. A notch 21 for mounting a plate vise (not shown) for mounting a plate is provided on the peripheral surface of the plate cylinder 8 so as to extend in the entire axial direction of the plate cylinder 8. ing.
[0004]
In such a configuration, when the printing press is operated, the film-like ink formed on the peripheral surface of the fountain roller 2 is transferred to the kneading roller 5 by the call-up roller 6, and the kneading roller 12 of the ink transfer roller group 7 and the shaking roller 12 are moved. The ink is supplied to the plate surface of the plate cylinder 8 via the ink setting roller 9 by leveling the ink in the horizontal and vertical directions by the rollers 10. Further, the dampening water stored in the watercraft 16 is supplied from the water source roller 17 to the metering roller 19, via the transfer roller 18, from the swimsuit roller 20 to the plate surface of the plate cylinder 8, and together with the ink supplied to the plate surface, the plate surface. To form an image.
[0005]
[Problems to be solved by the invention]
In the above-described ink supply device for a conventional printing press, when the ink forming roller 9 passes through the notch 21 of the plate cylinder 8, no ink is supplied to the plate cylinder 8. Is not consumed, and an excessive amount of ink is transferred onto the ink forming roller 9. In this state, as shown in FIG. 8A, when the ink 30a is transferred to the pattern portion of the plate cylinder 8, a step 31 of the ink film thickness is generated on the peripheral surface of the ink forming roller 9. The step portion 31 is reduced to some extent by the supply of the ink 30 from the swing roller 10 when passing through the nip of the swing roller 10, but the step portion 31 is not completely eliminated.
[0006]
Therefore, in the first rotation of the ink setting roller 9, a large amount of the ink 30a is transferred. On the other hand, at the second rotation of the ink setting roller 9, a smaller amount of the ink 30b is transferred, so that the inks 30a and 30b having different film thicknesses are transferred to the plate surface as shown in FIG. A step portion 31a having a linear ink film thickness is formed on the plate cylinder 8 in the axial direction. When this is transferred to paper, the step portion 31a of the ink film thickness appears as a linear shading in the left and right direction of the printed matter, and a streak as a printing obstacle is formed.
[0007]
Further, when the inking roller 9 comes into contact with the plate cylinder effective surface from the notch 21 of the plate cylinder 8, as shown in FIG. Due to the shock at the time of the rebound, the ink film thickness of the ink forming roller 9 is partially changed, and a line called a shock eye may occur.
[0008]
The occurrence of a streak called a shock or a repeat as described above is caused by the formation of a step portion of the ink film thickness on the peripheral surface of the ink forming roller 9.
[0009]
The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to reduce the number of articles.
[0010]
[Means for Solving the Problems]
In order to attain this object, the invention according to claim 1 is directed to a forming roller to which liquid is supplied from an upstream side, a roller in contact with the forming roller, and a liquid supplied from the forming roller in contact with the forming roller. In the liquid supply device having the plate cylinder described above, the forming roller or the roller includes a core portion and an elastic body formed outside the core portion, and the elastic body is provided outside the core portion. The diameter of the formed portion is different in the axial direction.
Therefore, the nip width between the setting roller and the roller or the nip width between the setting roller and the plate cylinder is formed so as not to be the same width in the axial direction of the setting roller but to be gradually changed.
[0011]
According to a second aspect of the present invention, in the first aspect of the invention, the diameter of the outer peripheral surface of the elastic body is formed to be the same in the axial direction.
Therefore, the nip pressure at a portion where the core portion of the wearing roller is large is relatively higher than the nip pressure at a portion where the core portion of the wearing roller is small.
[0012]
According to a third aspect of the present invention, in the first aspect of the invention, the diameter of the outer peripheral surface of the elastic body is gradually changed in the axial direction so as to be alternately larger and smaller.
Therefore, the nip pressure at the portion where the diameter of the elastic body of the wearing roller is large is relatively higher than the nip pressure at the portion where the diameter of the elastic body of the wearing roller is small.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1A is a cross-sectional view of an ink forming roller according to the present invention, FIG. 1B is a cross-sectional view taken along the line I (b) -I (b) in FIG. 1A, and FIG. FIG. 2 is a cross-sectional view taken along the line I (c) -I (c) in FIG. FIG. 2A is a front view showing a state where the ink forming roller and the swing roller are in contact with each other, FIG. 2B is a side view, and FIG. FIG. 3D is a plan view showing the shape of a nip formed between the ink forming roller and the swing roller. FIG. 3A is a plan view showing the entire shape of a conventional streak, and FIG. 3B is a plan view showing the entire shape of a streak when the ink forming roller according to the present invention is used. In FIGS. 1 and 2C and FIGS. 4 to 6 described later, for convenience of explanation, a step between the large diameter portion 91a and the small diameter portion 91b of the core portion 91 and the large diameter portion 93a and the small diameter portion of the rubber 93 are shown. The step with 93b is greatly exaggerated.
[0014]
As shown in FIG. 1A, the ink forming roller 9 which is a feature of the present invention is formed by a metal shaft portion 90 and a rubber 93 as an elastic body. The shaft portion 90 is formed by a core portion 91 and end shafts 92 formed at both ends of the core portion 91. The core portion 91 is provided with a plurality of large-diameter portions 91a formed with a diameter R1 and a plurality of small-diameter portions 91b formed with a diameter R2 alternately so that the diameter is gradually changed in the axial direction. Around the core portion 91, a rubber 93 as an elastic body formed in a substantially cylindrical shape is formed. The diameter of the outer peripheral surface of the rubber 93 is formed to be the same in the axial direction.
[0015]
In such a configuration, as shown in FIGS. 2A and 2B, the ink forming roller 9 and the swing roller 10 are brought into contact with each other by a predetermined nip pressure. Since the large-diameter portion 91a of the core portion 91 has slightly higher rigidity than the small-diameter portion 91b, the stress S1 generated in the large-diameter portion 91a by the nip pressure from the swing roller 10 as shown in FIG. Is relatively slightly larger than the stress S2 generated in the small diameter portion 91b. Therefore, the reaction force R1 from the swing roller 10 acting on the portion A1 corresponding to the large-diameter portion 91a on the peripheral surface of the ink forming roller 9 corresponds to the small-diameter portion 91b on the surface of the ink forming roller 9. The reaction force R2 from the swing roller 10 acting on the portion A2 is relatively slightly larger. In other words, the nip pressure at point A1 is relatively slightly higher than the nip pressure at point A2. Therefore, the nip 40 formed between the inking roller 9 and the oscillating roller 10 includes a wide portion 40a having a width L corresponding to the portion A1 and a wide portion 40a, as shown in FIG. A narrow portion 40b having a width of l corresponding to A2 is formed alternately in the left-right direction (the direction of arrow EF).
[0016]
By forming such a nip 40, even if a step portion of the ink film thickness which causes a streak is formed on the ink forming roller 9 in a straight line in the axial direction, the ink film thickness is not changed. Are distributed in a direction orthogonal to the axial direction when passing through the nip between the ink forming roller 9 and the swinging roller 10. Therefore, as shown in FIG. 3A, the streaks 51 formed linearly in the arrow EF direction on the conventional printed matter 50 are dispersed in the arrow CD direction (top and bottom direction) in the arrow EF direction. Therefore, the stitches 51 are formed in a wavy shape as shown in FIG.
[0017]
This is because the nip shape is the shape shown in FIG. 2D, so that the ink in the wide portion 40a is transferred to the plate cylinder 8 before the ink in the narrow portion 40b. Therefore, in FIG. 3B, the ink of the wide portion 40a is printed as the peak portion 51a relatively earlier on the paper 50 which advances in the arrow C direction during printing, and the ink of the narrow portion 40b is relatively printed. This is because printing is performed as the valley portion 51b with a delay. For this reason, the line 51 becomes difficult to see, in other words, becomes inconspicuous, so that the line 51 is apparently reduced.
[0018]
In this case, in order to reduce the number of lines, only the ink forming roller 9 is replaced, and no other mechanism is required. Therefore, the present invention can be easily applied to any printing machine regardless of the model, and the versatility can be improved. Due to the high cost, not only the manufacturing cost can be reduced, but also the replacement becomes easy. Further, since the change in the ink film thickness occurring on the plate cylinder 8 is reduced by the ink forming roller 9 which is directly in contact with the plate cylinder 8, the number of lines is further reduced.
[0019]
FIG. 4 is a sectional view of an ink forming roller according to the second embodiment of the present invention.
The difference between the second embodiment and the first embodiment is that the large diameter portion 91a and the small diameter portion 91b of the core portion 91 gradually change in the axial direction of the ink forming roller 9. Instead, it is formed in an uneven shape. With such an uneven shape, a step is formed at the boundary between the large-diameter portion 91a and the small-diameter portion 91b, but the core portion 91 faces the swing roller 10 via the rubber 93 that is an elastic body. Because of the contact, the stress is dispersed by the rubber 93 when the inking roller 9 comes into contact with the swing roller 10. Therefore, a sharp change in the nip pressure is restricted at the boundary between the large-diameter portion 91a and the small-diameter portion 91b, and the nip at the portion of the rubber 93 corresponding to the large-diameter portion 91a, as in the first embodiment. The pressure is relatively slightly higher than the nip pressure at a portion corresponding to the small diameter portion 91b of the rubber 93. Therefore, similarly to the above-described first embodiment, the nip 40 shown in FIG. 2D is formed, so that the number of lines is reduced.
[0020]
Further, in the second embodiment, the large-diameter portion 91a and the small-diameter portion 91b are formed in an uneven shape, so that the outer peripheral surface is formed so as to gradually change as in the above-described first embodiment. It is easier to manufacture as compared with the one, and the manufacturing cost can be reduced.
[0021]
FIG. 5 is a sectional view of an ink forming roller according to a third embodiment of the present invention.
The difference between the third embodiment and the first embodiment is that the thickness of the rubber formed on the core portion 91 is the same in the axial direction. Accordingly, the diameter of the outer peripheral surface of the rubber 93 gradually changes in the axial direction, and the outer peripheral surface of the rubber 93 is formed with a large diameter portion 93a and a small diameter portion 93b alternately in the axial direction. When the ink forming roller 9 and the swing roller 10 are in contact with each other, the nip pressure at the large diameter portion 93a becomes relatively higher than the nip pressure at the small diameter portion 93b. Therefore, as shown in FIG. 2D, the nip 40 formed between the ink application roller 9 and the swing roller 10 has a wide portion 40a corresponding to the large diameter portion 93a and a small diameter portion 93b. A narrow portion 40b is formed correspondingly. Therefore, the number of lines can be reduced in the same manner as in the above-described first embodiment.
[0022]
FIG. 6 is a sectional view of an ink forming roller according to a fourth embodiment of the present invention.
In the fourth embodiment, the thickness of the rubber 93 is alternately formed in a thick portion and a thin portion in the axial direction, and the thick portion is formed in the small diameter portion 91b of the core portion 91 to form the large diameter portion 93a. Then, a thin portion is formed on the large diameter portion 91a of the core portion 91 to form a small diameter 93b. As described above, by gradually changing the diameter of the outer peripheral surface of the ink forming roller 9 in the axial direction and alternately providing the large-diameter portions 93a and the small-diameter portions 93b, the number of stitches can be reduced as in the above-described third embodiment. It is possible to do.
[0023]
【Example】
The interval between the large diameter portions 91a, 91a is preferably in the range of 10 mm to 20 mm. The step between the small diameter portion 91b and the large diameter portion 91a is desirably in the range of 1 mm to 3 mm.
[0024]
In the present embodiment, the diameter of the core portion 91 of the ink forming roller 9 is formed so as to be alternately larger and smaller in the axial direction. It is possible to indirectly reduce the step of the ink film thickness formed on the plate cylinder 8 by alternately forming the ink cylinder in the direction. Further, the diameter of the core portion of the swimsuit roller 20 in contact with the plate cylinder 8 may be formed so as to be alternately large and small in the axial direction. Since the step portion can be reduced, an image can be formed on the plate cylinder 8 with high accuracy.
[0025]
Further, the diameter of the rider roller 20a in contact with the swimsuit roller 20 is formed so as to gradually change in the axial direction, so that the step portion of the film thickness of the dampening solution formed on the plate cylinder 8 can be indirectly reduced. . Furthermore, the present invention can be applied to a varnishing roller of a varnishing device that supplies varnish to a plate cylinder via a roller. As described above, in the present embodiment, the ink has been described as the liquid that generates the streaks, but a dampening solution or a varnish may be used as the liquid. Further, by changing the distance between the large diameter portion 91a and the small diameter portion 91b for each of the four ink forming rollers 9, the step portion of the ink film thickness can be more dispersed, so that the number of lines can be further reduced. . In addition, although an example in which the rubber 93 is used as the elastic body has been described, a resin may be used. Further, a plurality of large diameter portions 91a and small diameter portions 91b of the core portion 91 are provided alternately, but at least two may be provided.
[0026]
【The invention's effect】
As described above, according to the present invention, it is possible to reduce the number of repetitions or shocks, which are referred to as “lines”. In addition, since only the rollers are replaced to reduce the number of lines and no other mechanism is required, it can be applied to any printing press regardless of the model, and its high versatility reduces manufacturing costs. Not only can it be done, but it is also easy to replace.
[Brief description of the drawings]
1A is a cross-sectional view of an inking roller according to the present invention, FIG. 1B is a cross-sectional view taken along the line I (b) -I (b) in FIG. 1A, and FIG. () Is a sectional view taken along the line I (c) -I (c) in FIG.
FIG. 2A is a front view showing a state in which an ink forming roller and a swing roller according to the present invention are in contact with each other, FIG. 2B is a side view, and FIG. (D) is a plan view showing the shape of a nip formed between the ink forming roller and the swing roller.
FIG. 3A is a plan view showing the entire shape of a conventional streak, and FIG. 3B is a plan view showing the entire shape of a streak when the ink forming roller according to the present invention is used. is there.
FIG. 4 is a sectional view of an ink forming roller according to a second embodiment of the present invention.
FIG. 5 is a sectional view of an inking roller according to a third embodiment of the present invention.
FIG. 6 is a sectional view of an inking roller according to a fourth embodiment of the present invention.
FIG. 7 is a configuration diagram of an ink supply device of a general printing press.
FIG. 8A is an enlarged front view showing a state in which the inking roller has passed through a notch in the plate cylinder and then transferred from the inking roller to the plate cylinder; FIG. FIG. 4 is an enlarged front view showing a state in which the ink is transferred to the printer.
FIG. 9 is an enlarged front view showing a state where the ink forming roller is in contact with a plate angle of a notch of the plate cylinder.
[Explanation of symbols]
Reference numeral 8: plate cylinder, 9: inking roller, 10: swing roller, 20: swimsuit roller, 21, 26, 28: notch, 21a: plate angle, 25: rubber cylinder, 27: impression cylinder, 30: ink, 31a ... step portion of ink film thickness, 40 ... nip, 40a ... wide portion, 40b ... narrow portion, 50 ... printed matter, 51 ... line, 90 ... shaft portion, 91 ... core portion, 91a ... large diameter portion, 91b ... small diameter Part, 93: rubber, 93a: large diameter part, 93b: small diameter part.

Claims (3)

A setting roller to which liquid is supplied from the upstream side,
A roller that comes into contact with the wearing roller,
A liquid supply device comprising: a plate cylinder that is in contact with the forming roller and is supplied with liquid from the forming roller;
The wearing roller or the roller includes a core portion and an elastic body formed outside the core portion,
A liquid supply device, wherein a diameter of a portion where an elastic body is formed outside the core portion is different in an axial direction. The liquid supply device according to claim 1,
A liquid supply device characterized in that the outer peripheral surface of the elastic body has the same diameter in the axial direction. The liquid supply device according to claim 1,
A liquid supply device characterized in that the diameter of the outer peripheral surface of the elastic body is gradually changed in the axial direction so as to be alternately larger and smaller.

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