JP2010094928A - Spray dampener apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent mist of dampening water in a housing of a spray dampener apparatus from leaking out of the housing, and to prevent foreign substances such as ink mist from invading inward from the outside of the housing. <P>SOLUTION: The housing 6 equipped with an opening toward dampening water roller accommodates a spray nozzle 5 which is provided in parallel in the longitudinal direction of the dampening water roller 1 and sprays the dampening water to the dampening water roller 1, has an upstream side partitioning wall 18 and a downstream side partitioning wall 19, equipped with openings 24 facing the surface of the dampening water roller, on an upstream end and a downstream end of the opening of the housing, each partitioning wall has drain holes 22 and 23 passing through the housing, respectively. As the partitioning walls catch effectively the mist and liquidize it thereby, passing through of the mist inside and outside of the housing can be effectively suppressed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a spray dampener device which is a spray-type dampening water supply device used in an offset printing press.

  The offset printing machine performs printing by adhering ink to the image area of the printing plate and adhering dampening water to the non-image area. A device that attaches dampening water to the printing plate is called a dampener device. There are several types of dampener devices depending on the operating principle. A typical type is a spray dampener using a fountain solution spray. The spray dampener includes a spray nozzle, and sprays dampening water in a spray form from the spray nozzle toward the dampening water roller.

  The basic structure of a spray dampener device that is widely used is such that spray nozzles are arranged in a row facing the dampening water roller and spray dampening water toward the dampening water roller. Furthermore, the spray dampener device is covered with a housing so as to surround the spray nozzle. The role of the housing is to prevent the dampening water sprayed from the spray nozzle from splashing around, and to prevent ink mist (mist-like ink particles) floating around the housing from entering the housing. There is a place to prevent.

  When a large amount of mist of fountain solution scatters outside the housing, it adheres to the components of the printing press and liquefies, and drops onto the printing paper and the passage of printing paper such as a cylinder used for printing. Water dripped onto the printing paper and the passage of the printing paper immediately causes printing defects such as white spots.

  When the ink mist enters the housing of the spray dampener device, it accumulates in the vicinity of the spray nozzle and the spray pattern as designed cannot be maintained. When the spray pattern is deformed, a partial dampening water shortage occurs, which causes printing defects such as background stains.

  Patent Documents 1 and 2 describe a technique for preventing dampening water from splashing outside the housing of the spray dampener device. The technique described in Patent Document 1 achieves the object by maintaining the inside of the housing at a negative pressure. However, the spray dampener apparatus shown here requires a negative pressure source and a mechanism for liquefying the collected dampening water.

  Patent Document 2 discloses a dampener device having a mechanism for ejecting air from ducts provided at both ends of a housing. The air blown out of the duct prevents the mist of fountain solution from leaking out of the housing. However, the dampener device must be combined with an air supply source, and the configuration is complicated.

  Patent Document 3 and Patent Document 4 show an ultraviolet irradiation device that prevents an inert gas from flowing out of the housing. The device shown here is a technique for sealing the inside and outside of the housing by utilizing the difference in pressure between the inside and outside of the housing.

JP 2000-141596 A Japanese Utility Model Sho 55-094834 JP2008-104957 JP2008-073597

The conventional spray dampener device is configured to prevent the mist of dampening water in the housing from going out of the housing or to prevent ink mist from entering the inside of the housing of the spray dampener device. There was a problem that is complicated.
The present invention improves the conventional spray dampener device, prevents the mist of dampening water in the housing of the spray dampener device from leaking to the outside of the housing, and ink mist etc. from the outside of the housing to the inside. The purpose is to prevent foreign objects from entering.

  The spray dampener device according to the present invention is arranged in parallel in the longitudinal direction of the fountain solution roller, the spray nozzle spraying the fountain solution onto the fountain solution roller, the spray nozzle accommodated therein, the fountain solution roller And a partition having an opening toward the surface of the dampening water roller at the end of the opening of the housing.

The present invention includes the following configurations (1) to (7).
(1) The partition wall is composed of a plurality of rows.
(2) The distance between the surface of the dampening water roller and the end of the partition wall is in the range of 0.5 mm to 5.0 mm.
(3) A partition wall is provided inside the housing.
(4) A partition wall is provided outside the housing.
(5) The partition walls are provided on both the inside and outside of the housing.
(6) The partition has a drain part for discharging the liquid retained in the partition.
(7) The drain part of the partition wall guides liquefied water into the housing.

  According to the first aspect of the present invention, since the partition wall provided in the housing of the spray dampener device effectively captures and liquefies mist, the circulation of mist inside and outside the housing is effectively suppressed. As a result, the mist of the fountain solution in the housing is captured by the partition wall and liquefied, and therefore hardly flows out of the housing. Ink mist floating outside the housing hardly penetrates into the housing. This effect can be confirmed by experiments.

  According to invention of Claim 2, the partition is comprised from the some row | line | column. This feature adds some complexity to the structure but makes the septum effect more complete.

  According to the invention of claim 3, the distance between the surface of the dampening water roller and the end of the partition is closely related to the effect of the partition. According to experiments, the distance is preferably in the range of 0.5 mm to 5.0 mm, preferably 4.0 mm or less. However, when it exceeded 5.0 mm, the result that the effect of a partition could not be expected very much was obtained.

  According to the invention of claim 4, the partition wall is provided inside the housing. If it does so, the external dimension of the conventional spray dampener apparatus and the spray dampener apparatus of this invention can be made the same. Therefore, it becomes possible to easily replace the conventional spray dampener device.

  According to the invention of claim 5, the partition wall is provided outside the housing. If it does in this way, compared with the conventional spray dampener device, the external dimension will become large for the part which provided the partition. However, even if the external dimensions of the spray dampener device are increased, there is an advantage that the partition wall does not interfere with the spray pattern inside the housing if it can be mounted.

  According to invention of Claim 6, the partition was provided so that it might straddle the inner side and the outer side of a housing. This reduced the increase in the external dimensions of the spray dampener even in the spray dampener device with the partition added. Also, the structure is such that the partition walls are unlikely to obstruct the spray pattern inside the housing.

  According to the seventh aspect of the present invention, the drain portion provided in the partition wall discharges liquefied water out of the partition wall. As a result, the water captured by the partition wall does not accidentally drop onto the printing paper or the printing paper path.

  According to the invention of claim 8, the drain portion provided in the partition wall guides water into the housing. Originally, the spray dampener device has a structure for discharging dampening water adhering to the inside of the housing. This is because part of the dampening water sprayed from the nozzle does not reach the surface of the dampening water roller. If the drain part provided in the partition wall guides water into the housing, it is possible to use a structure for discharging dampening water originally provided in the spray dampener device.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of a first embodiment of the present invention. Reference numeral 1 denotes a dampening water roller. The dampening water roller 1 rotates clockwise as indicated by an arrow 2. 3 is a spray dampener device. 5 is a spray nozzle. 6 is a housing. The housing 6 is a rectangular box as a whole. The spray nozzle 5 is attached to the bottom plate 7 of the housing 6.

  Reference numeral 8 denotes an opening of the housing 6. The length of the dampening water roller 1 is about 1600 mm. The length of the housing 6 is also substantially the same as that of the dampening water roller 1. The housing 6 is formed by an upstream side plate 10, a downstream side plate 11, a bottom plate 7, a first horizontal plate 12, and a second horizontal plate that faces the horizontal plate 12 (not shown). The first horizontal plate 12 and the second horizontal plate are disposed at both ends of the fountain solution roller 1. A plurality of spray nozzles 5 are arranged at equal intervals along the length direction of the dampening water roller 1.

  Reference numeral 9 denotes a spray mist discharged from the nozzle 5. The spray mist 9 reaches the outer peripheral surface 4 of the fountain solution roller 1 exposed to the opening 8 through the opening 8. Reference numeral 13 denotes a discharge duct. The discharge duct 13 includes a drain pan 14 and a drain pipe 15. The drain pan 14 has substantially the same length as the housing 6 along the housing 6. The discharge duct 13 receives all excess water discharged from the spray dampener device 3 by the drain pan 14 and drains it from the drain pipe 15.

  Reference numerals 16 and 17 denote drain holes provided in the housing 6 and are provided at locations where liquefied dampening water is accumulated as shown in the figure. Part of the spray mist 9 sprayed from the spray nozzle 5 adheres to the side plates 10 and 11 of the housing 6 and liquefies. The drain holes 16 and 17 guide the fountain solution liquefied inside the housing 6 to the discharge duct 13. The drain holes 16 and 17 do not have to be one, and a plurality of drain holes may be provided.

  18 is an upstream partition, and 19 is a downstream partition. The upstream partition 18 is formed by a side plate 10 and a wall plate 20 having a cross-sectional shape similar to the letter L. The downstream partition wall 19 is formed by the side plate 11 and the wall plate 21. The partition walls 18 and 19 are formed integrally with the housing 6 and have substantially the same length as the housing 6. Reference numeral 22 denotes a drain hole serving as a drain portion provided in the upstream partition wall 18, and reference numeral 23 denotes a drain hole serving as a drain portion provided in the downstream partition wall 19.

  FIG. 2 is an enlarged view of the upstream partition 18 shown in FIG. The downstream partition wall 19 can be realized with substantially the same structure as the upstream partition wall 18. The partition wall 18 forms an opening 24 toward the outer peripheral surface 4 of the dampening water roller 1. A boundary layer is formed on the outer peripheral surface 4 of the rotating dampening water roller 1, and the boundary layer includes ink mist and the like. The partition wall 18 collects ink mist drawn from the outside of the housing 6 toward the inside. The collected mist is liquefied and guided from the drain part 22 to the inside of the housing 6. Then, the exhaust duct 13 is reached through the drain hole 16 shown in FIG.

  According to the above-described embodiment, the spray dampener device 3 can prevent the mist of the fountain solution in the housing 6 from going out of the housing 6. Most of the mist 9 discharged from the spray nozzle 5 that has not reached the outer periphery 4 of the fountain solution roller 1 adheres to the inside of the housing 6 and liquefies. Then, the drain hole 16 reaches the discharge duct 13. Further, the excess mist of fountain solution tends to flow out of the housing 6 through the gap between the housing 6 and the outer peripheral surface 4 of the fountain solution roller 1. However, most of the dampening water mist is recovered by the partition wall and reaches the discharge duct 13. Therefore, it is possible to prevent the mist of dampening water leaking from the spray dampener device 3 from being liquefied outside the spray dampener device 3 and inadvertently dropping onto the printing paper or the passage route of the printing paper.

On the other hand, most of the ink mist that tries to enter the inside from the outside of the housing 6 is also captured by the partition wall.
Among the partition walls shown in FIG. 2, there is an appropriate distance between the outer peripheral surface 4 of the dampening water roller 1 and the partition wall 18. The gap between the end 25 of the side plate 10 and the outer peripheral surface 4 is G1, and the distance between the end 26 of the wall plate 20 and the outer peripheral surface 4 is G2. The distance between G1 and G2 affects the effect of the present invention. In the experiment, a white paper having a side of 20 mm was fixed to the nozzle portion shown in FIG. 1, the printer was actually operated for a predetermined time, and the state of the ink mist adhering to the white paper was visually observed. The comparative example was a spray dampener apparatus in which the partition walls 18 and 19 before the present invention were removed. In this comparative example, only G1 exists and the distance is 3 mm.

First, in the comparative example, it was observed that ink mist adhered to the white paper. Further, leakage of mist of dampening water from the periphery of the housing 6 could be confirmed visually. On the other hand, the present invention was implemented and G1 and G2 were experimented at various distances. As a result, it was found that when G1 and G2 were 6 mm, it was not much different from the comparative example when the present invention was not carried out. That is, the ink mist adhered to the white paper, and the leakage of the fountain solution mist was confirmed visually. When G1 and G2 were 5 mm, it was considerably improved and the effect of the partition wall could be confirmed. However, when the distance between G1 and G2 is 5 mm, it is an improvement effect compared to the comparative example, and the more effective is when G1 and G2 are 4 mm or less. Therefore, G1 and G2 should be 5 mm or less, preferably 4 mm or less. This distance is applicable to both partition walls 18 and 19 shown in FIG.
G1 and G2 should be as close as possible, but in practice they cannot be made extremely close. At least the outer peripheral surface 4 of the fountain solution roller 1 and the end of the partition wall should not contact in any case. However, since the printing cylinders have heavy cylinders rotating at a high speed, vibration of the printing machine itself is unavoidable, and the spray dampener device is an elongated structure, and G1 and G2 are It is desirable that it is 0.5 mm or more.

FIG. 3 shows another embodiment of the present invention. The upstream partition 27 shown in FIG. 3 has two rows of partitions. The first column is indicated by 28 and the second column is indicated by 29. The first row 28 is formed by the side plate 10 and the partition wall 30, and the second row 29 is formed by the partition wall 30 and the partition wall 31. Reference numerals 32 and 33 denote drain holes as drain portions. The drain holes may be provided as shown in 34 and 35, or may be combined. It is sufficient that the water captured by the partition walls of the first row 28 and the second row 29 does not stay in the partition walls.
As shown in FIG. 3, when the partition wall 27 has a two-row structure such as the first row 28 and the second row 29, the structure becomes complicated, but the sealing effect which is the original function of the partition wall can be enhanced.

  FIG. 4 shows a second embodiment of the present invention. The difference from the spray dampener device 3 shown in FIG. 1 is that an upstream partition 36 and a downstream partition 37 are provided outside the housing 6. That is, the partition wall 36 is located outside the housing 6 with respect to the side plate 10, and the partition wall 37 is located outside the housing 6 with respect to the side plate 11. Reference numeral 38 denotes a drain portion of the upstream partition wall 36, and reference numeral 39 denotes a drain portion of the downstream partition wall 37.

  As shown in FIG. 4, the opening 8 of the housing 6 is widened by providing the upstream partition wall 36 and the downstream partition wall 37 outside the housing 6. If a place can be secured on the side of the printing press, it is preferable because the partition wall does not disturb the spray mist 9 of the fountain solution.

FIG. 5 shows a third embodiment of the present invention. The difference from the embodiment shown in FIG. 1 is that the opening end of the housing 6 is located at the position of the upstream partition 40 and the position of the downstream partition 41. The upstream partition 40 is formed by a partition 44 and a partition 45 provided on both sides with the side plate 10 in the center. The downstream partition 41 is formed by a partition 46 and a partition 47 provided on both sides with the side plate 11 in the center. 42 is a drain part of the upstream partition 40, and 43 is a drain part of the downstream partition 41.
According to the present embodiment, it is possible to widen the opening 8 of the housing 6 without greatly changing the outer dimension of the housing 6 due to the partition walls 40 and 41.

  FIG. 6 shows a fourth embodiment of the present invention. The fountain solution device 3 shown in FIG. 6 is an example when the housing 6 is substantially horizontal. 48 is an upstream partition, and 49 is a downstream partition. The side plate 10 is the same as in the other embodiments. Unlike the other embodiments, the wall plate 50 is deformed. The wall plate 50 is modified so as to form a groove 51 as a drain portion. The groove 51 retains the water captured by the partition wall 48. Although not shown, the water staying in the groove 51 may be guided to the end of the partition wall 48 and merged with the drainage path of the housing 6. With such a configuration, it is possible to prevent the water captured by the partition wall 48 from being inadvertently dropped on the outer surface 4 of the dampening water roller 1 or other portions.

  Similarly, in the partition wall 49, the side plate 11 has a groove 52 formed in the partition wall 49. Although not shown, the water staying in the groove 52 may be guided into the housing 6 from the end of the partition wall 49. The wall plate 53 forming the partition wall 49 is not required to have a groove, but when the excess mist of the spray mist 9 adheres, the wall plate 53 does not carelessly drip onto the outer peripheral surface 4 of the water roller 1. It is desirable. With such a structure, it is possible to prevent the water captured by the partition wall 49 from dripping inadvertently onto the outer surface 4 of the dampening water roller 1 or other portions.

  FIG. 7 is a partially enlarged view showing a modification of the partition wall shown in FIG. The wall plate 20 is attached to the side plate 10 of the housing 6. The drain portion 22 shown in FIG. 2 is provided in a row on the bottom portion 61 along the side plate 10. However, as shown in FIG. 7, the drain portion 62 may be provided at the end of the partition wall 18. In this case, the bottom 61 of the wall plate 20 can be inclined so that water can be discharged more actively.

The discharge duct 13 shown in FIG. 1 has a role to prevent the liquefied water from dripping inadvertently into the printing paper or the passage of the printing paper. Part of it. However, since it is sufficient to prevent inadvertent dripping of water, it may be omitted depending on the printing press.
In addition, the partition walls described in the embodiments are illustrated as drain holes in which a drain portion is positively provided. However, since the partition wall can be realized by sheet metal processing or synthetic resin processing, it can be sufficiently realized by a structural gap instead of a hole, and can also be realized by a slit shape.
Furthermore, although the upstream partition and the downstream partition have been described as being symmetrical in principle, the structure may be asymmetric, including the distance between the partition and the outer peripheral surface of the dampening water roller.

It is sectional drawing of 1st Embodiment of the spray dampener apparatus which concerns on this invention. It is an enlarged view of the upstream partition shown in FIG. It is an enlarged view which shows the modification of an upstream partition. It is sectional drawing which showed 2nd Embodiment of the spray dampener apparatus which concerns on this invention. It is sectional drawing which showed 3rd Embodiment of the spray dampener apparatus which concerns on this invention. It is sectional drawing which showed 4th Embodiment of the spray dampener apparatus which concerns on this invention. It is the elements on larger scale which show the modification of the partition shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dampening water roller 3 Spray dampener device 5 Spray nozzle 6 Housing 7 Bottom plate 8 Housing opening 9 Spray mist 10 Upstream side plate 11 Downstream side plate 12 Horizontal plate 13 Discharge duct 14 Drain pan 15 Drain pipe 16, 17 Drain Hole 18 Upstream partition 19 Downstream partition 20, 21 Wall plate 22, 23 Drain hole 24 Opening

Claims (8)

  A spray nozzle arranged in parallel in the longitudinal direction of the dampening water roller, spraying dampening water onto the dampening water roller, a housing containing the spray nozzle, and having an opening toward the dampening water roller; A spray dampener apparatus comprising a partition wall provided with an opening toward the surface of the dampening water roller at an end of the opening of the housing.   The spray dampener device according to claim 1, wherein the partition wall includes a plurality of rows.   The spray dampener device according to claim 1 or 2, wherein a distance between a surface of the dampening water roller and an end of the partition wall is in a range of 0.5 mm to 5.0 mm.   The spray dampener device according to any one of claims 1 to 3, wherein the partition wall is provided inside the housing.   The spray dampener device according to any one of claims 1 to 3, wherein the partition wall is provided outside the housing.   The spray dampener device according to any one of claims 1 to 3, wherein the partition walls are provided on both inner and outer sides of the housing.   The spray dampener device according to any one of claims 1 to 6, wherein the partition wall includes a drain portion that discharges the liquid retained in the partition wall.   The spray dampener device according to claim 7, wherein the drain portion provided in the partition guides liquefied water into the housing.

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