JP4109024B2 - Liquid supply device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid supply apparatus that supplies liquid supplied from an upstream side to a plate cylinder via a form roller.
[0002]
[Prior art]
The most typical example of this type of liquid supply apparatus is an ink supply apparatus for a printing press. As shown in FIG. 4, the ink supply apparatus of this printing machine includes an ink fountain 4 in which a blade 1 and a fountain roller 2 are provided and ink 3 is stored, and an erection roller 2 and a kneading roller 5 alternately. It is composed of a calling roller 6 that reciprocates while contacting, and an ink transfer roller group 7 provided on the downstream side of the kneading roller 5. The ink transfer roller group 7 is provided on the upstream side of the four ink form rollers 9 that are in contact with the plate cylinder 8, the pair of swing rollers 10 and 10 that are in contact with the ink form roller 9, and the swing rollers 10 and 10. The kneading roller 11, the kneading roller 12 in contact with the kneading roller 5, the rider roller 13 in contact with each of the ink forming roller 9 and the kneading roller 11, and the like.
[0003]
A water supply device 15 includes a water source roller 17 that rotates in the water boat 16 and a transfer roller 18 that rotates in a direction opposite to the water source roller 17. A metering roller 19 that rotates in the direction contacts, and a transfer roller 18 contacts a swimsuit roller 20 that contacts the plate cylinder 8. A rider roller 20 a is in contact with the swimsuit roller 20. A notch 21 for mounting a plate vise (not shown) for mounting the 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 reed roller 2 is transferred to the kneading roller 5 by the calling roller 6, and the kneading roller 12 of the ink transfer roller group 7 and the swinging roller are swung. It is leveled horizontally and vertically by the roller 10, and ink is supplied to the plate surface of the plate cylinder 8 via the ink form roller 9. Further, the dampening water stored in the water boat 16 is supplied from the water source roller 17 through the metering roller 19 and the transfer roller 18 to the plate surface of the plate cylinder 8 from the swimsuit roller 20, and together with the ink supplied to the plate surface, An image is formed on the printing plate.
[0005]
[Problems to be solved by the invention]
In the above-described conventional ink supply device of a printing press, when the ink form 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 form roller 9. In this state, as shown in FIG. 5A, when the ink 30 a is transferred to the pattern portion of the plate cylinder 8, a step portion 31 having an ink film thickness is generated on the peripheral surface of the ink form roller 9. The stepped portion 31 is reduced to some extent by the ink 30 being supplied from the swinging roller 10 when passing through the nip of the swinging roller 10, but the stepped portion 31 is not completely eliminated.
[0006]
Therefore, a large amount of ink 30a is transferred in the first rotation of the ink form roller 9. On the other hand, in the second rotation of the ink form roller 9, a smaller amount of the ink 30b is transferred, so that the ink 30a and the ink 30b having different film thicknesses are transferred to the printing plate 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 the paper, the step 31a of the ink film thickness appears as a linear shading in the left-right direction of the printed matter, and a line that becomes a printing obstacle is formed.
[0007]
Further, when the ink form roller 9 comes into contact with the plate cylinder effective surface from the notch portion 21 of the plate cylinder 8, as shown in FIG. 6, it comes into contact with the plate corner 21 a of the notch portion 21 and rebounds. Due to the shock at the time of rebounding, the ink film thickness of the ink form roller 9 partially changes, and a line called a shock is sometimes generated.
[0008]
Thus, the occurrence of the streak referred to as a shock or repeat is caused by the formation of a step portion of the ink film thickness on the peripheral surface of the ink form 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 striations.
[0010]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 is characterized in that a liquid is supplied from the upstream side, a roller that is in contact with the roller, and a liquid that is in contact with the roller and is supplied from the roller. In the liquid supply apparatus including the plate cylinder, the diameter of the forming roller or the diameter of the roller is changed so that the nip formed between the forming roller and the roller alternates between the wide portion and the narrow portion in the axial direction. As shown in FIG. 2, the roller is formed so as to have two or more large diameter portions and two or more small diameter portions so as to gradually change in the axial direction of the forming roller or in the axial direction of the roller.
Accordingly, the nip width between the form roller and the roller and the nip width between the form roller and the plate cylinder are formed so as to gradually change without being formed to have the same width in the axial direction of the form roller.
[0011]
According to a second aspect of the present invention, the radial thickness of the elastic body formed on the core portion of the forming roller or the core portion of the roller is gradually changed in the axial direction of the forming roller or the axial direction of the roller. It is formed to have two or more large-diameter portions and small-diameter portions so as to be large and small.
Accordingly, the nip width between the form roller and the roller and the nip width between the form roller and the plate cylinder are formed so as to gradually change without being formed to have the same width in the axial direction of the form roller.
[0012]
According to a third aspect of the present invention, there is provided a liquid supply apparatus comprising: a form roller that is supplied with liquid from an upstream side; and a plate cylinder that is in contact with the form roller and is supplied with liquid from the form roller. The diameter of the roller is gradually changed in the axial direction of the forming roller so that the nip of the forming roller alternately forms the wide portion and the narrow portion in the axial direction, and the large diameter portion and the small diameter portion are alternately increased and decreased. Are formed so as to have two or more.
Accordingly, the nip width between the form roller and the plate cylinder is not formed to be the same width in the axial direction of the form roller but is formed so as to gradually change.
[0013]
The invention according to claim 4 is the invention according to claim 3, wherein the radial thickness of the elastic body formed on the core portion of the form roller is gradually changed in the axial direction of the form roller and alternately increased and decreased. In this way, it is formed so as to have two or more large-diameter portions and small-diameter portions.
Accordingly, the nip width between the form roller and the plate cylinder is not formed to be the same width in the axial direction of the form roller but is formed so as to gradually change.
[0014]
DETAILED DESCRIPTION OF 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 form roller according to the present invention, FIG. 1B is a cross-sectional view taken along line I (b) -I (b) in FIG. 1A, and FIG. It is I (c) -I (c) sectional view taken on the line in (a). 2A is a front view showing a state where the ink form roller and the swing roller are in contact with each other, FIG. 2B is a side view, and FIG. 2C is a view between the ink form roller and the swing roller. It is a top view which shows the shape of the nip formed. FIG. 3A is a plan view showing the overall shape of a conventional line, and FIG. 3B is a plan view showing the overall shape of the line when the ink form roller according to the present invention is used. In FIG. 1, for the sake of convenience of explanation, the thickness of the rubber 93 is made larger than the actual thickness, and the step between the large diameter portion 93a and the small diameter portion 93b is greatly exaggerated.
[0015]
As shown in FIG. 1 (a), the ink form roller 9, which is a feature of the present invention, is composed of a metal shaft portion 90 and rubber 93 as an elastic body. The shaft portion 90 is formed by a core portion 91 and end shafts 92 and 92 that are formed to protrude from both ends of the core portion 91. The rubber 93 is formed in a substantially cylindrical shape and is formed around the core portion 91. The thickness T of the rubber 93 in the radial direction is gradually changed in the axial direction of the ink form roller 9, and alternately has a large thickness T1 and a small thickness. It is formed at T2. That is, the ink form roller 9 is provided with a plurality of alternating large-diameter portions 93a formed on the diameter R1 and small-diameter portions 93b formed on the diameter R2 so as to gradually change the diameter R in the axial direction. ing.
[0016]
In such a configuration, as shown in FIGS. 2A and 2B, the ink form roller 9 and the swing roller 10 are brought into contact with each other with a predetermined nip pressure. Large diameter portions 93a and small diameter portions 93b are alternately provided in the ink form roller 9 in the axial direction. For this reason, the nip pressure at the large diameter portion 93 a of the ink form roller 9 is slightly higher than the nip pressure at the small diameter portion 93 b of the ink form roller 9. Accordingly, the nip 40 formed between the ink form roller 9 and the swing roller 10 is formed with a wide portion 40a having a width L and a width l, as shown in FIG. The narrow portions 40b are alternately formed in the left-right direction (arrow EF direction).
[0017]
By forming such a nip 40, even if a step portion of the ink film thickness that causes the generation of the streak is formed on the ink form roller 9 linearly in the axial direction, this ink film thickness Are distributed in a direction perpendicular to the axial direction when passing through the nip between the ink form roller 9 and the swing roller 10. Therefore, as shown in FIG. 3A, the stripes 51 that are formed linearly in the direction of the arrow EF in the conventional printed product 50 are dispersed in the direction of the arrow CD (the vertical direction) in the direction of the arrow EF. Therefore, as shown in FIG. 5B, the streak 51 is formed in a wave shape.
[0018]
This is because the nip shape is the shape shown in FIG. 2C, so that the ink in the wide portion 40a is transferred to the plate cylinder 8 before the ink in the narrow portion 40b. Accordingly, in FIG. 3 (b), the ink of the wide portion 40a is relatively preceded and printed as the peak portion 51a on the paper 50 traveling in the direction of arrow C during printing, and the ink of the narrow portion 40b is relatively This is because it is printed as the valley portion 51b with a delay. For this reason, the streak 51 becomes difficult to see, in other words, becomes inconspicuous, so that the streak 51 is apparently reduced after all.
[0019]
In this case, since only the ink form roller 9 is replaced to reduce the stripes, no other mechanism is required, so it can be easily applied to any printing machine regardless of the model, and is versatile. Since it is expensive, not only the manufacturing cost can be reduced, but also replacement is facilitated. Further, since the change in the ink film thickness generated in the plate cylinder 8 is reduced by the ink form roller 9 that directly contacts the plate cylinder 8, the lines are further reduced.
[0020]
【Example】
The interval between the large diameter portions 93a and 93a is preferably in the range of 50 mm to 100 mm. The step between the small diameter portion 93b and the large diameter portion 93a is preferably in the range of 0.5 mm to 1 mm.
[0021]
In this embodiment, the diameter of the ink form roller 9 in contact with the plate cylinder 8 is formed so as to gradually change in the axial direction. However, the diameter of the swing roller 10 or the rider roller 13 in contact with the ink form roller 9 is changed. It is formed so as to gradually change in the axial direction, and the step portion of the ink film thickness formed on the plate cylinder 8 can be indirectly reduced. In this case, the radial diameter of the rubber formed on the core portion of the rider roller 13 is gradually changed in the axial direction of the rider roller 13 so that the large diameter portion and the small diameter portion are alternately formed. Good. Further, the swing roller 10 formed entirely of metal may be formed with a large-diameter portion and a small-diameter portion so that the outer periphery gradually changes in the axial direction and alternately becomes larger and smaller. Further, the diameter of the swimsuit roller 20 that contacts the plate cylinder 8 may be formed so as to gradually change in the axial direction. In this case, the stepped portion of the dampening water film thickness on the plate cylinder 8 is reduced. Therefore, an image can be formed on the plate cylinder 8 with high accuracy. Further, although the plurality of large-diameter portions 93a and small-diameter portions 93b of the rubber 93 are alternately provided, at least two may be provided.
[0022]
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, and the stepped portion of the fountain solution film formed on the plate cylinder 8 can be indirectly reduced. . In this case, the radial diameter of the rubber formed on the core portion of the rider roller 20a is gradually changed in the axial direction of the rider roller 20a so that the large diameter portion and the small diameter portion are alternately formed. Good. Furthermore, the present invention can also be applied to a varnishing roller of a varnishing device that supplies a varnish to a plate cylinder via a roller. As described above, in the present embodiment, the ink is described as the liquid in which the streak is generated. However, the liquid may be dampening water or varnish. Further, by changing the interval between the large diameter portion 93a and the small diameter portion 93b for each of the four ink form rollers 9, the step portions of the ink film thickness can be further dispersed, and therefore the stripes can be further reduced. . Moreover, although the example using rubber | gum 93 as an elastic body was shown, it is good also as resin.
[0023]
【The invention's effect】
As described above, according to the present invention, it is possible to reduce repeat eyes and shock eyes called lines. In addition, only the roller is replaced to reduce the stitches, and no other mechanism is required, so it can be applied to any printing machine regardless of the model, and the versatility is high, reducing the manufacturing cost. Not only can it be done, it is also easy to replace.
[0024]
Further, according to the invention according to claim 3 or 4, the effect is greater since the lines generated in the plate cylinder are reduced by the attaching roller that directly contacts the plate cylinder.
[Brief description of the drawings]
1A is a sectional view of an ink form roller according to the present invention, FIG. 1B is a sectional view taken along line I (b) -I (b) in FIG. ) Is a cross-sectional view taken along line I (c) -I (c) in FIG.
FIG. 2 (a) is a front view showing a state where an ink form roller and a swing roller according to the present invention are in contact with each other, FIG. 2 (b) is a side view, and FIG. It is a top view which shows the shape of the nip formed between swing rollers.
FIG. 3 (a) is a plan view showing the overall shape of a conventional strip, and FIG. 3 (b) is a plan view showing the overall shape of the strip when the ink form roller according to the present invention is used. is there.
FIG. 4 is a configuration diagram of an ink supply device of a general printing press.
FIG. 5A is an enlarged front view showing a state in which the ink form roller has passed through the notch of the plate cylinder and then transferred from the ink form roller to the plate cylinder, and FIG. It is a front view which expands and shows the state by which the ink was transcribe | transferred.
FIG. 6 is an enlarged front view showing a state in which an ink form roller is in contact with a plate angle of a notch of a plate cylinder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 8 ... Plate cylinder, 9 ... Inking roller, 10 ... Swing roller, 20 ... Swimsuit roller, 21, 26, 28 ... Notch, 21a ... Plate angle, 25 ... Rubber drum, 27 ... Impression roller, 30 ... Ink, 31a ... Step part of ink film thickness, 40 ... Nip, 40a ... Wide part, 40b ... Narrow part, 50 ... Print, 51 ... Strip, 90 ... Shaft part, 91 ... Core part, 93 ... Rubber, 93a ... Large diameter part , 93b ... small diameter part.

Claims (4)

A form roller to which liquid is supplied from the upstream side;
A roller that contacts the landing roller;
In a liquid supply apparatus comprising a plate cylinder that is in contact with the form roller and is supplied with liquid from the form roller,
The diameter of the form roller or the diameter of the roller is determined so that the nip formed between the form roller and the roller alternately forms wide portions and narrow portions in the axial direction. The liquid supply apparatus is characterized by being formed so as to have two or more large-diameter portions and two or more small-diameter portions so as to gradually change in the axial direction and to alternately become larger and smaller. The liquid supply apparatus according to claim 1, wherein
A large-diameter portion so that the thickness of the elastic body formed in the core portion of the forming roller or the core portion of the roller gradually changes in the axial direction of the forming roller or the axial direction of the roller, and alternately increases or decreases. A liquid supply apparatus characterized in that it has two or more small diameter portions. A form roller to which liquid is supplied from the upstream side;
In a liquid supply apparatus provided with a plate cylinder that is in contact with the form roller and is supplied with liquid from the form roller,
The diameter of the form roller, wear as nip rollers to form alternately a wide portion and a narrow portion in the axial direction, form roller larger diameter portion and so that large and small alternately gradually changing in the axial direction of the A liquid supply apparatus characterized in that it has two or more small diameter portions. The liquid supply apparatus according to claim 3.
The elastic body formed in the core portion of the forming roller has a thickness in the radial direction that is gradually changed in the axial direction of the forming roller so as to have two or more large-diameter portions and small-diameter portions alternately. The liquid supply apparatus characterized by the above-mentioned.

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