JP2015098100A - Inking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inking device capable of suppressing the volatilization amount of a solvent component in ink collected after being dripped or scattered from a proximity position between a plate cylinder and a finisher roll.SOLUTION: An inking device includes: a plate cylinder; a finisher roll arranged in proximity to the plate cylinder; an external wall part which is provided on the opposite side of the finisher roll from the plate cylinder, and forms an ink pool part in an upper region of the finisher roll together with the plate cylinder; a surplus ink receiving pan which extends continuously from a lower end of the external wall part toward the plate cylinder; and an ink circulation device which circulates ink collected from a bottom part of the surplus ink receiving pan to the ink pool part.

Description

  The present invention relates to an inking device used for a gravure printing machine, a gravure coater, and the like.

  In this type of inking apparatus, an inking apparatus called a furnisher blade bank system is conventionally known (see, for example, Patent Document 1).

  As disclosed in Patent Document 1, the inking device of the system includes a plate cylinder, a finisher roll disposed so as to be close to the plate cylinder, and a finisher roll on the opposite side of the plate cylinder. And an outer wall portion (sometimes called an applicator) that forms an ink reservoir in the upper region of the finisher roll together with the plate cylinder.

  In such an inking device, the ink in the ink reservoir is continuously applied to the plate cylinder by the rotation of the finisher roll. The ink applied to the plate cylinder is then applied to the web to be printed, so that printing on the web is performed.

  In such an inking device, ink drops or scatters from a position adjacent to the plate cylinder and the finisher roll. For this reason, a surplus ink receiving pan is conventionally provided below the plate cylinder and the finisher roll. Usually, the ink collected by the surplus ink receiving pan is circulated to the ink reservoir and applied again to the plate cylinder. In addition, the surplus ink receiving pan usually extends to a region below the doctor that scrapes the ink.

JP 2002-59535 A

  By the way, in a conventional furnisher blade bank type inking apparatus, the surplus ink receiving pan is disposed relatively far from the plate cylinder and the furnisher roll. In this case, it takes a long time for the ink recovered from the excess ink receiving pan by dripping or scattering from the proximity position between the plate cylinder and the finisher roll to be exposed to air, and the volatilization amount of the solvent component in the ink increases. .

  For this reason, with this type of conventional inking apparatus, the viscosity of the recovered ink tends to increase. When ink with increased viscosity is recycled, the print quality becomes unstable. Therefore, when the viscosity of the ink is increased, it is necessary to use a large amount of a dropping solvent for adjusting the viscosity, which causes a problem in terms of the cost of the solvent and the environmental load.

  On the other hand, in this type of inking device, when changing the printing item (ink change), it is necessary to replace or clean the finisher roll, the surplus ink receiving pan, etc. Naturally, it is desirable that the work can be performed as easily as possible.

  The present invention has been created based on the above findings. An object of the present invention is to provide an inking device capable of suppressing the volatilization amount of a solvent component in ink recovered after being dropped or scattered from a proximity position between a plate cylinder and a finisher roll.

  The present invention is provided on a plate cylinder, a finisher roll disposed so as to be close to (contact with ink) the plate cylinder, and on the opposite side of the plate cylinder of the finisher roll, An outer wall portion that forms an ink reservoir in the upper region of the finisher roll together with the plate cylinder, an excess ink receiving pan that continuously extends from the lower end of the outer wall portion toward the plate cylinder side, and And an ink circulation device that circulates the ink collected from the bottom of the surplus ink receiving pan to the ink reservoir.

  According to the present invention, since the surplus ink receiving pan is disposed so as to continuously extend from the lower end of the outer wall portion to the plate cylinder side, the distance between the finisher roll and the plate cylinder and the surplus ink receiving pan is short. The time for which the ink is exposed to the air until it is dropped or scattered from the close position of the furnisher roll and the plate cylinder and collected in the surplus ink receiving pan is suppressed, and the volatilization amount of the solvent component of the ink is suppressed. . For this reason, an increase in the viscosity of the ink is suppressed, the stability of the print quality can be ensured, and the cost and environmental burden of the solvent for adjusting the viscosity can be suppressed.

  In addition, since the outer wall portion and the excess ink receiving pan constituting the ink reservoir portion are integrated, the number of parts can be suppressed and the production efficiency can be improved, and the outer wall portion and the excess ink receiving pan can be integrally attached and detached. The work such as replacement is facilitated.

  In order to sufficiently suppress the volatilization amount of the solvent component of the ink, the surplus ink receiving pan is preferably provided at a position 10 to 50 mm below the lower end of the plate cylinder.

  In addition, the surplus ink receiving pan usually has an inclined inner surface. In this case, since the ink can be smoothly guided by the inclined inner surface of the surplus ink receiving pan, the ink can be efficiently collected.

  Moreover, it is preferable that the side wall part extended upward is provided in the both ends of the said excess ink receiving pan in the axial direction of the said plate cylinder and the said finisher roll. In this case, the ink collected in the surplus ink receiving pan is suppressed from flowing out from both ends of the surplus ink receiving pan, and the ink can be efficiently collected.

  The inking device according to the present invention includes a frame disposed above the plate cylinder and the finisher roll, a pair of bearings that pivotally support the finisher roll, and the outer wall portion, respectively. And a pair of support arm portions that are supported at the distal end portions. And the base end part of the said support arm part may be supported by the said frame so that rocking | fluctuation is possible. In this case, the finisher roll and the outer wall are swung so that the finisher roll approaches the plate cylinder at a desired angle (contacts via ink) corresponding to each of a plurality of types of diameter cylinders. ).

  According to the present invention, since the surplus ink receiving pan is disposed so as to continuously extend from the lower end of the outer wall portion to the plate cylinder side, the distance between the finisher roll and the plate cylinder and the surplus ink receiving pan is short. In addition, the time during which the ink recovered from the excess ink receiving pan by dripping or scattering from the close position between the finisher roll and the plate cylinder is exposed to air is suppressed, and the volatilization amount of the solvent component of the ink is suppressed. For this reason, an increase in the viscosity of the ink is suppressed, the stability of the print quality can be ensured, and the cost and environmental burden of the solvent for adjusting the viscosity can be suppressed.

It is a schematic longitudinal cross-sectional view of the inking apparatus by the 1st Embodiment of this invention. It is a top view of the inking device by a 1st embodiment. It is a side view of the inking device by a 1st embodiment. It is a front view of the inking device by a 1st embodiment. It is a schematic side view of the inking apparatus by the 2nd Embodiment of this invention. It is a figure which shows the state by which the finisher roll and the excess ink receiving pan in the inking apparatus were rock | fluctuated from the state of FIG. It is a figure which shows the state by which the finisher roll and the excess ink receiving pan in the inking apparatus were rock | fluctuated from the state of FIG.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic longitudinal sectional view of an inking device 1 according to a first embodiment of the present invention. FIG. 2 is a top view of the inking device 1, FIG. 3 is a side view of the inking device 1, and FIG. 4 is a front view of the inking device 1.

  As shown in FIG. 1, the inking device 1 according to the present embodiment includes a plate cylinder 10 and a finisher roll 11 arranged so as to be close to the plate cylinder 10. In the present embodiment, the plate cylinder 10 and the finisher roll 11 are arranged side by side in a positional relationship in which the axes C1 and C2 are parallel to each other.

  The plate cylinder 10 is supported so as to be rotatable around its axis C1, and the finisher roll 11 is supported so as to be rotatable around its axis C2. As shown in FIGS. 2 to 4, the plate cylinder 10 has a shaft portion 10A protruding at both end portions in the axial direction, and the finisher roll 11 has a shaft portion 11A protruding at both end portions in the axial direction. doing.

  The plate cylinder 10 and the finisher roll 11 are pivotally supported by bearings at their shaft portions 10A and 11A, and are driven to rotate about the respective axes C1 and C2 by a drive portion such as a motor. Yes. In the illustrated example, as shown by arrows R1 and R2 in FIG. 1, the plate cylinder 10 is rotated clockwise, and the finisher roll 11 is rotated counterclockwise. It has become.

  The inking device 1 according to the present embodiment is a so-called finisher blade bank type inking device. The finisher roll 11 and the finisher roll 11 are disposed on the opposite side of the finisher roll 11 from the finisher cylinder 10. An outer wall portion 12 adapted to form an ink reservoir portion 13 is provided in the upper region.

  As shown in FIG. 2, the outer wall portion 12 is a plate-like member extending in the direction of the axis C <b> 2 of the finisher roll 11. The ink reservoir 13 is a part that forms a space for storing ink, and stores ink supplied from an ink circulation device 20 described later.

  In the present embodiment, the outer wall portion 12 is formed in a shallow V shape in a sectional view. That is, the outer wall portion 12 includes a vertically extending portion 12A that extends in the vertical direction of the finisher roll 11, and an inclined extending portion 12B that forms an obtuse angle with respect to the vertically extending portion 12A from the lower end of the vertically extending portion 12A. ,have. The inclined extending portion 12 </ b> B is close to or in contact with the outer peripheral surface of the finisher roll 11.

  In the present embodiment, the inking device 1 is provided with an excess ink receiving pan 14 that continuously extends from the lower end of the outer wall portion 12, that is, the lower end of the inclined extending portion 12 </ b> B, toward the plate cylinder 10. That is, the outer wall portion 12 and the surplus ink receiving pan 14 are integrated.

  The surplus ink receiving pan 14 has an inner surface that is inclined in a sectional view. Specifically, as shown in FIGS. 2 to 4, the surplus ink receiving pan 14 is composed of a plate-like member bent at an obtuse angle and forms a shallow V-shape as a whole, and the V-shape. A horizontal portion 14B extending from the portion 14A to the inclined extending portion 12B of the outer wall portion 12. The bottom portion of the V-shaped portion 14 </ b> A is located in a region substantially immediately below the center of the plate cylinder 10. Further, the surplus ink receiving pan 14 has a larger width dimension than the finisher roll 11 in the direction of the axis C <b> 2 of the finisher roll 11.

  In FIG. 1, the symbol H <b> 1 indicates the vertical distance between the lower end of the plate cylinder 10 and the innermost bottom portion of the V-shaped portion 14 </ b> A of the surplus ink receiving pan 14, and the symbol H <b> 2 is below the finisher roll 11. The vertical distance between the end and the lowermost inner surface of the V-shaped portion 14A is shown. Here, the distance H1 is preferably in the range of 10 to 50 mm.

  That is, it is preferable that the surplus ink receiving pan 14 (the lowermost inner surface of the V-shaped portion 14 </ b> A) is provided at a position 10 to 50 mm below the lower end of the plate cylinder 10.

  As shown in FIGS. 2 to 4, in the present embodiment, the surplus ink receiving pan 14 is provided at both ends of the plate cylinder 10 and the finisher roll 11 in the direction of the axis (C1, C2). And a front wall portion 14F provided on the opposite side of the horizontal portion 14B and extending upward. The outer wall portion 12 also has side wall portions 12S at both ends in the axis (C1, C2) direction of the plate cylinder 10 and the finisher roll 11, and the side wall portion 14S and the side wall portion 12S are continuous.

  Further, as shown in FIG. 1, above the plate cylinder 10 on the front wall portion 14 side, it is in a state of being close to or in contact with the outer peripheral surface of the plate cylinder 10 in order to scrape the ink applied to the plate cylinder 10. An arranged doctor 30 is provided. The surplus ink receiving pan 14 extends so that the front wall portion 14 </ b> F is located in a region below the doctor 30.

  The ink circulation device 20 includes an ink tank 21 for storing ink, a drawing tube 22 having one end inserted into the ink tank 21, an ink pump 23 to which the other end of the drawing tube 22 is connected, and one end to the ink pump 23. The supply pipe 24 that is connected and the other end penetrates the upper part of the upper and lower extension part 12A of the outer wall part 12 and an opening (drain port) provided on the bottom surface of the V-shaped part 14A of the surplus ink receiving pan 14 And a drain pipe 25 having one end connected and the other end inserted into the ink tank 21.

  Further, in FIG. 1, reference numeral 40 denotes an impression cylinder disposed so as to be close to the plate cylinder 10 above the plate cylinder 10. Reference sign W indicates a web to be printed that is fed out as the plate cylinder 10 and the impression cylinder 40 rotate.

  Next, the operation of the inking device 1 of the present embodiment will be described.

  When the ink pump 23 of the ink circulation device 20 is driven, the ink stored in the ink tank 21 is drawn from the drawing tube 22, supplied from the supply tube 24 to the ink reservoir 13, and stored in the ink reservoir 13. . The ink in the ink reservoir 13 is continuously applied to the plate cylinder 10 by the rotation of the finisher roll 11. The ink applied to the plate cylinder 10 is then applied to the web W to be printed, so that printing on the web W is performed.

  At this time, as indicated by an arrow α in FIG. 1, ink that has been excessively applied to the plate cylinder 10 is dropped or scattered from a position adjacent to the plate cylinder 10 and the finisher roll 11. The dropped or scattered ink is collected by the surplus ink receiving pan 14. The ink collected from the V-shaped portion 14 </ b> A of the surplus ink receiving pan 14 returns to the ink tank 21 through the drain pipe 25. The ink returned to the ink tank 21 is circulated to the ink reservoir 13 by driving the ink pump 23.

  In the inking device 1 according to the present embodiment, the surplus ink receiving pan 14 is disposed so as to continuously extend from the lower end of the outer wall portion 12 toward the plate cylinder 10, thereby the finisher roll 11 and the plate cylinder 10. The distance from the surplus ink receiving pan 14 is short. For this reason, the time during which the ink is exposed to the air until it is dropped or scattered from the close position between the finisher roll 11 and the plate cylinder 10 and collected in the surplus ink receiving pan 14 is suppressed, and the solvent component of the ink is volatilized. The amount is suppressed. For this reason, an increase in the viscosity of the ink is suppressed, the stability of the print quality can be ensured, and the cost and environmental burden of the solvent for adjusting the viscosity can be suppressed.

  In the present embodiment, since the outer wall portion 12 constituting the ink reservoir 13 and the surplus ink receiving pan 14 are integrated, the number of parts can be suppressed and the production efficiency can be improved, and the outer wall portion 12 and the surplus ink can be improved. Since the receiving pan 14 can be attached and detached as a unit, work such as replacement is facilitated.

  The surplus ink receiving pan 14 has an inclined inner surface. Since the ink can be smoothly guided by the inclined inner surface of the excess ink receiving pan 14, the ink can be efficiently collected.

  Side walls 14 </ b> S that extend upward are provided at both ends of the excess ink receiving pan 14 in the axial direction of the plate cylinder 10 and the finisher roll 11. For this reason, it is suppressed that the ink collect | recovered by the surplus ink receiving pan 14 flows out from the both ends of the surplus ink receiving pan 14, and can collect ink efficiently.

  Next, an experiment will be described in which the volatilization amount of the ink solvent component of the inking device 1 in the present embodiment is compared with the volatilization amount of the ink solvent component of the conventional inking device.

  In this experiment, the surplus ink receiving pan 14 (the lowermost inner surface of the V-shaped portion 14A) of the inking device 1 was disposed at a position 20 mm below the lower end of the plate cylinder 10. As a result, the surplus ink receiving pan 14 was disposed at a position below the furnisher roll 11 by a distance slightly larger than 20 mm from the lower end.

  On the other hand, the surplus ink receiving pan of the conventional inking device is disposed at a position 160 mm below the lower end of the plate cylinder. As a result, the conventional inking device is disposed at a position below the furnisher roll by a distance slightly larger than 160 mm from the lower end.

  Then, while printing is not being performed, the plate cylinder and the finisher roll are rotated, and the ink is circulated by driving the ink pump of the ink circulation device. Calculated as

  As a result of the experiment, the ink volatilization amount of the inking device 1 according to the present embodiment was about 37% smaller at any time than the ink volatilization amount of the conventional device.

  Next, FIG. 5 is a side view of the inking device 2 according to the second embodiment of the present invention. 6 and 7 are views showing a state where the finisher roll and the surplus ink receiving pan are swung from the state of FIG. 5 to 7, the same reference numerals are given to the same components as those in the first embodiment, and the detailed description thereof will be omitted.

  As shown in FIG. 5, the inking device 2 according to the present embodiment includes a frame F disposed above the plate cylinder 10 and the finisher roll 11, and a pair of bearings 16 that pivotally support the finisher roll 11. And a pair of support arm portions 15 that integrally support the outer wall portion 12 at each tip portion 15A. Each support arm portion 15 has a base end portion 15B supported by the frame F so as to be swingable.

  The distal end portion 15A of the support arm portion 15 is disposed so as to be positioned outside the finisher roll 11 in the direction of the axis C2. The base end portion 15B can swing around a swing axis C3 parallel to the axis C2. The support arm portion 15 accommodates the bearing 16 at each of the pair of tip portions 15 </ b> A, and pivotally supports the shaft portion 11 </ b> A of the finisher roll 11 via the bearing 16.

  According to the present embodiment, the position of the finisher roll 11 and the outer wall portion 12 is brought closer to or away from the axis C1 of the plate cylinder 10 by swinging the support arm portion 15 about the swing axis C3. Therefore, the finisher roll 11 can be brought close to (in contact with ink) the plate cylinder 10 so as to correspond to each of the plate cylinders 10 having a plurality of types of diameters.

  Specifically, in the state of FIG. 5, the finisher roll 11 is brought close to the plate cylinder 10 having a diameter Ra. As shown in FIG. 6, when the plate cylinder 10 having a diameter Rb smaller than the diameter Ra is used in the inking device 2, the finisher roll is made by swinging the support arm portion 15 about the swing axis C <b> 3. 11 can be brought close to the plate cylinder 10 having a diameter Rb.

  On the other hand, as shown in FIG. 7, when the plate cylinder 10 having a diameter Rc larger than the diameter Ra is used in the inking device 2, the support arm portion 15 is swung around the swing axis C3, whereby The finisher roll 11 can be brought close to the plate cylinder 10 having a diameter Rc.

  In this embodiment as well, since the surplus ink receiving pan 14 is arranged so as to continuously extend from the lower end of the outer wall portion 12 to the plate cylinder 10 side, each case where the plate cylinders 10 having different diameters are used. , The increase in the viscosity of the ink is suppressed, the stability of the printing quality can be secured, and the cost and environmental burden of the solvent for adjusting the viscosity can be suppressed.

  In the present embodiment, since the surplus ink receiving pan 14 has the V-shaped portion 14A, the surplus ink receiving pan 14 can easily approach the plate cylinders 10 having different diameters without interfering with each other.

  When a plate cylinder significantly larger than the diameter Rc shown in FIG. 7 is used, the shape of the surplus ink collection pan 14, the diameter of the finisher roll 11, the length of the support arm portion 15, and the support arm portion Similarly, the finisher roll 11 can be brought close to the plate cylinder 10 by appropriately adjusting the support position of the 15 finisher rolls 11.

DESCRIPTION OF SYMBOLS 1, 2 Inking apparatus 10 Plate cylinder 11 Finisher roll 12 Outer wall part 13 Ink reservoir part 14 Excess ink receiving pan 15 Support arm part 16 Bearing 20 Ink circulation apparatus

Claims (5)

Plate cylinder,
A finisher roll disposed so as to be close to the plate cylinder;
An outer wall portion provided on the opposite side of the plate cylinder of the furnisher roll and configured to form an ink reservoir in the upper region of the finisher roll together with the plate cylinder;
An excess ink receiving pan extending continuously from the lower end of the outer wall portion to the plate cylinder side;
An ink circulation device for circulating the ink collected from the bottom of the excess ink receiving pan to the ink reservoir,
An inking device characterized by comprising: 2. The inking apparatus according to claim 1, wherein the surplus ink receiving pan is provided at a position 10 to 50 mm below the lower end of the plate cylinder. The inking apparatus according to claim 1, wherein the surplus ink receiving pan has an inclined inner surface. The inboard according to any one of claims 1 to 3, wherein side walls extending upward are provided at both ends of the excess ink receiving pan in the axial direction of the plate cylinder and the finisher roll. King device. A frame disposed above the plate cylinder and the finisher roll;
A pair of bearings that pivotally support the furnisher roll and a pair of support arm portions that integrally support the outer wall portion at each tip portion;
Is further provided,
The inking device according to any one of claims 1 to 4, wherein a base end portion of the support arm portion is swingably supported by the frame.

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