JP2009226630A - Paper powder removal apparatus, rotary printing machine, and method for removing paper powder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper powder removal apparatus which enables the secure removal of paper powder adhered to printing paper. <P>SOLUTION: The paper powder removal apparatus 12A applied for the offset rotary printing machine 10 contacts the surface of a roll-like web W which is printing paper to be transferred and at the same time removes the paper powder adhered on the web W, including a first paper powder removal roller 31-1 with water immersed therein which abuts one side of the web W, and removes the paper powder adhered to the web W and a first damping water circulation apparatus 32-1 which supplies the damping water S onto the surface of the first paper powder removal roller 31-1 and at the same time collects the adsorbed paper powder along with the damping water S. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a paper dust removing device, a rotary printing machine and a paper dust removing method for removing paper dust adhering to the surface of printing paper.

  Conventionally, paper powder that cannot be removed at the manufacturing stage remains and adheres to paper products such as printing paper manufactured by a paper manufacturing apparatus. If such paper dust remains and adheres to the surface of paper products, etc., a phenomenon of stains called “hicky” that causes partial white spots and stains in non-image areas occurs. Since characters and the like are printed on the surface of such paper products, it is required to reliably remove paper dust from the entire paper products without damaging the printed surface. In order to remove such paper dust, various paper dust removing devices for removing paper dust such as paper products have been proposed.

  An example of the configuration of a conventional paper dust removing device is shown in FIG. As shown in FIG. 4, the conventional paper dust removing device 100A includes a roller 102 that rotates with the travel of the printing paper P on the inlet side of the printing paper P below the path of the printing paper P in the housing 101, and printing. A pair of upper and lower air ejection heads (ejection means) 103 on the downstream side of the roller 102 at the upper and lower positions of the paper P feeding path and a pair of upper and lower air on the downstream side of the air ejection head 103 at the upper and lower positions of the printing paper P feeding path. A suction head (suction means) 104 is provided. Further, in the housing 101, there are provided an air introduction pipe 103a, an air suction pipe 104a, and a pair of upper and lower hoods 105 each having an outer peripheral edge attached to both side walls of the housing 101, and these hood 105 and printing paper. A chamber 106 is formed with P (see Patent Document 1).

  The air sent to the air introduction pipe 103a from the air injection nozzle 103b of each air introduction pipe 103a of the pair of upper and lower air ejection heads 103 is ejected toward the printing paper P. Then, the paper dust released from the printing paper P is sucked and removed into the air suction pipe 104a by the air ejected by the air ejection head 103 from the air suction nozzle 104b of each of the upper and lower air suction heads 104a. I am doing so. Further, the cross-sectional shape of the roller that conveys the printing paper is polygonal so that paper dust is more effectively removed.

  FIG. 5 shows another configuration of the conventional paper dust removing device. As shown in FIG. 5, another conventional paper dust removing device 100 </ b> B includes a plurality of guide rollers 111 arranged along the traveling direction so as to contact the surface of the printing paper P, and the surface of the printing paper P. A pair of an endless belt 112 which is a wiping material in contact with the water tank 113 and a water tank 113 for collecting paper dust attached to the endless belt 112 are provided. The paper powder adhering to the endless belt 112 is moved by pressing the endless belt 112 against both sides of the printing paper P, removing paper dust adhering to the printing paper P while rubbing the paper surface, and immersing it in the water tank 113. Is supposed to be recovered. And the paper dust adhering to the printing paper P is removed again using the endless belt 112 from which the paper dust has been removed (see Patent Document 2).

JP 2007-22710 A Japanese Patent No. 2540277

  However, in the method of blowing air onto the surface of the conventional printing paper P as shown in FIG. 4 and blowing off the paper powder adhering to the surface of the printing paper P, the printing paper P is not in contact with the printing paper P. There is a problem that paper dust adhering to the surface of P is poorly removed and cannot be removed sufficiently.

  Further, in the conventional method of making the cloth contact with the printing paper P and wiping off the paper dust adhering to the printing paper P like the endless belt 112 moistened with water as shown in FIG. The paper dust adhering to the printing paper P can be reliably removed because of the contact, but there is a problem that the paper dust accumulated on the endless belt 112 is transferred to the printing paper P again as it is.

  Further, since it is necessary to replace the endless belt 112, there is a problem that the cost increases and the apparatus becomes large.

  In view of the above problems, an object of the present invention is to provide a paper dust removing device that reliably removes paper dust adhering to printing paper while suppressing cost.

  A first invention of the present invention for solving the above-described problem is a paper dust removing apparatus that removes paper dust adhering to the printing paper while contacting at least one surface of the printing paper to be conveyed. At least one paper dust removing roller impregnated with moisture that removes paper dust adhering to the printing paper in contact with one surface of the printing paper, and supplying moisture to the surface of the paper dust removing roller In addition, the present invention provides a paper dust removing device having a moisture circulation device that collects adsorbed paper dust together with moisture.

  A second invention is the paper dust removing device according to the first invention, wherein the moisture circulating device has a partition plate that partitions the moisture supplied into the main body and the moisture recovered from the paper dust. .

  According to a third invention, in the first or second invention, a first driving means for adjusting a feeding speed of the printing paper, a second driving means for driving and rotating the paper dust removing roller, the first driving means, The paper dust removing apparatus has a drive control means for driving and controlling the second driving means, wherein a rotation speed of the paper dust removing roller is different from a feeding speed of the printing paper.

  A fourth invention is the paper dust removing apparatus according to any one of the first to third inventions, wherein a rotation speed of the paper dust removing roller is faster than a feeding speed of the printing paper.

  A fifth invention is characterized in that, in any one of the first to fourth inventions, the moisture circulating device has a paper dust scraping means for peeling the paper dust attached to the paper dust removing roller. Located in the powder remover.

  A sixth aspect of the present invention is the paper dust removing device according to any one of the first to fifth aspects, wherein the rotational speed of the paper dust removing roller is faster than the normal rotational speed of the paper dust removing roller. It is in.

  A seventh invention is the paper dust removing device according to any one of the first to fifth inventions, wherein the rotational speed of the paper dust removing roller is slower than the normal rotational speed of the paper dust removing roller. It is in.

  An eighth invention is the paper according to any one of the first to seventh inventions, wherein the moisture circulating device uses the moisture again after removing the paper dust from the moisture recovered from the paper dust. Located in the powder remover.

  A ninth invention is characterized in that, in any one of the first to eighth inventions, the moisture circulating device supplies moisture to the paper dust removing roller via at least one moisture adjusting roller. In the paper dust removal device.

  A tenth invention is the paper dust removing device according to any one of the first to ninth inventions, wherein the moisture is dampening water.

  An eleventh aspect of the present invention is the paper feeding device that feeds out a roll-shaped web and the paper feeding device according to any one of the first to tenth aspects of the invention that removes paper dust on at least one surface of the web fed out from the paper feeding device. Paper dust removing device, printing device for printing on the web, drying device for drying the ink printed on the web, cooling device for cooling the web after drying, and discharging the web after cooling A rotary printing machine having a paper discharge device for paper.

  A twelfth aspect of the invention is a paper dust removing method characterized by removing paper dust adhering to printing paper conveyed using the paper dust removing device of any one of the first to tenth inventions.

  According to the present invention, at least one paper dust removing roller impregnated with moisture that removes paper dust attached to the printing paper in contact with one surface of the printing paper, and the paper dust removing roller Since it has a moisture circulation device that supplies moisture to the surface and collects the adsorbed paper dust together with moisture, the paper dust adhering to the printing paper can be reliably removed. In addition, the paper dust adhering to the paper dust removing roller is dampened and washed away with the water in the water circulation device, and the water is supplied to the paper dust removing roller so that the paper dust removed from the printing paper is removed. It can be used without being transferred again to the printing paper.

  Further, according to the present invention, the moisture circulating device has a partition plate that partitions the moisture supplied into the main body and the moisture from which the paper dust is collected, so that fresh moisture is constantly supplied to the paper dust removing roller. It is possible to remove the paper dust adhering to the printing paper without transferring the paper dust removed from the printing paper to the printing paper again.

  According to the present invention, the first driving means for adjusting the feeding speed of the printing paper, the second driving means for driving and rotating the paper dust removing roller, the first driving means and the second driving means are provided. Drive control means for driving and controlling the rotational speed of the paper dust removing roller and the feeding speed of the printing paper, so that the rotational speed of the paper dust removing roller and the feeding speed of the printing paper are set to a desired value. By making the speed, that is, the difference between the peripheral speeds appropriate, paper dust adhering to the printing paper can be more reliably removed. Thereby, generation | occurrence | production of a hickey can be prevented and print quality can be improved.

  Further, according to the present invention, since the rotation speed of the paper dust removing roller is faster than the feeding speed of the printing paper, the paper dust removing roller is attached to the printing paper by slipping the printing paper. The paper dust that has been removed can be peeled off by the paper dust removing roller so that the paper dust adhering to the printing paper is not taken directly to the printing side. Thereby, the paper dust adhering to the printing paper can be more effectively removed.

  Further, according to the present invention, the dampening water circulation device has paper dust scraping means for peeling off the paper dust adhered to the paper dust removing roller, so that the paper dust scraping means is connected to the paper dust removing roller. By contacting, paper dust can be removed from the paper dust removal roller, and paper dust removal performance can be improved. Thereby, the paper dust adhering to the paper dust removing roller can be more effectively removed.

  Further, according to the present invention, since the rotational speed of the paper dust removing roller is faster than the normal rotational speed of the paper dust removing roller, the slip ratio between the printing paper and the paper dust removing roller is increased, The removal efficiency of the paper dust adhering to the printing paper can be further increased.

  Further, according to the present invention, the rotational speed of the paper dust removing roller is slower than the normal rotational speed of the paper dust removing roller, so that moisture is removed when removing the paper dust adhering to the printing paper. It can be prevented from splashing.

  Further, according to the present invention, the dampening water circulation device uses the water again after removing the paper dust from the water from which the paper dust has been collected, so the running cost of the device can be reduced.

  Further, according to the present invention, the dampening water circulation device supplies moisture to the paper dust removing roller via at least one dampening water adjusting roller. An appropriate amount of dampening water can be supplied without supplying water.

  Further, according to the present invention, since dampening water is used as the water, the running cost of the apparatus can be suppressed.

  According to the present invention, a paper feeding device that feeds out a roll-shaped web, and any one of the paper dust removing devices that removes paper dust on at least one surface of the web fed from the paper feeding device. A printing device that prints on the web, a drying device that dries the ink printed on the web, a cooling device that cools the dried web, and a paper discharge that discharges the cooled web Therefore, the printing quality can be improved.

  In addition, according to the present invention, the paper dust adhering to the printing paper conveyed using any one of the above paper dust removing devices is removed, so that the paper dust adhering to the printing paper is surely removed. In addition, the paper dust removed from the printing paper can be used without being transferred again to the printing paper.

  Exemplary embodiments of a paper dust removing device and an offset rotary printing press according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

  1 is a schematic configuration diagram of an offset rotary printing press to which a paper dust removing device according to a first embodiment of the present invention is applied. FIG. 2 is a simplified configuration of the paper dust removing device in the offset rotary printing press according to the first embodiment. It is a conceptual diagram shown in FIG.

  As shown in FIG. 1, an offset rotary printing press 10 to which the paper dust removing device of Example 1 is applied includes a paper feeding device 11, a paper dust removing device (infeed device) 12 </ b> A, a printing device 13, and a drying device. The apparatus 14 includes a cooling device 15, a web pass device 16, and a folding device 17. The printing apparatus 13 includes a plurality of printing units 21 and 22 for each of the four ink colors Cyan, Magenta, yellow, and black. , 23, 24. In this embodiment, four ink colors are used. However, the present invention is not limited to single colors, two colors, six colors, and the like. In this embodiment, the paper dust removing device 12A and the second paper dust removing device 12A-2 are provided on both surfaces of the web W as the paper dust removing device 12A.

  Accordingly, a roll-shaped web (paper) W provided in the paper feeding device 11 is fed out by the paper dust removing device 12A, and multicolor printing is performed by the printing units 21, 22, 23, 24 in the printing device 13, The printed web W is dried by the drying device 14, cooled by the cooling device 15, and conveyed to the folding device 17 through the web pass device 16, where a signature is created. In addition, the rotational speeds of the plurality of rollers provided in each apparatus and around which the web W is wound are appropriately controlled so that the tension between the rollers of the web W is optimized.

  The printing units 21, 22, 23, and 24 constituting the printing apparatus 13 have substantially the same configuration. For example, as illustrated in FIG. 1, the printing unit 21 includes an upper unit 25 that performs printing on the front surface of the web W and a lower unit 26 that performs printing on the back surface of the web W. , 26 can be printed on both sides of the web W.

  The upper unit 25 includes a plate cylinder 25a on which a plate on which a print image is formed is mounted, an inking device (not shown) that supplies ink to the plate cylinder 25a, and an image of the plate mounted on the plate cylinder 25a. It has a blanket cylinder 25b as a printing cylinder to be transferred to the surface. On the other hand, the lower unit 26 includes a plate cylinder 26a on which a plate on which a printed image is formed is mounted, an inking device (not shown) that supplies ink to the plate cylinder 26a, and an image of the plate mounted on the plate cylinder 26a. And a blanket cylinder 26b as a printing cylinder to be transferred to the surface.

  Accordingly, the blanket cylinder 25b of the upper unit 25 and the blanket cylinder 26b of the lower unit 26 are in contact with each other with a predetermined printing pressure, and the web W conveyed to the printing unit 21 is separated from the upper blanket cylinder 25b. The paper is supplied to a nip portion between the blanket cylinder 26b, and printing is performed on both sides of the web W by passing through the nip portion.

FIG. 2 is a conceptual diagram schematically showing the configuration of the paper dust removing apparatus according to Embodiment 1 of the present invention.
In this embodiment, in order to remove paper dust on both sides of the web W, a pair of paper dust removing devices 12A are provided on both sides of the web W, and the first paper dust removing device is provided on one surface of the web W. 12A-1 is provided, and a second paper dust removing device 12A-2 is provided on the other surface of the web W.

As shown in FIG. 2, the first paper dust removing device 12 </ b> A- 1 according to the present embodiment is a paper attached on the web W while being in contact with the surface of the roll-shaped web W that is a printing paper to be conveyed. In the paper dust removing device that removes the powder, a first paper dust removing roller 31-1 that is impregnated with moisture that contacts one surface of the web W and removes the paper dust adhering to the web W; A dampening water S is supplied to the surface of one paper dust removing roller 31-1, and a first dampening water circulation device 32-1 that collects the adsorbed paper dust together with the dampening water S is provided.
In the drawing, reference numerals 33a to 33c are guide rollers that are provided so as to be in contact with the web W and convey the web W.
In the present embodiment, dampening water is used as the moisture. Here, the dampening water refers to water that damps the plate surface so that ink does not adhere to the non-image area of lithographic printing, and includes normal water.

  The web W is stretched around a plurality of guide rollers 33 arranged along the traveling direction so as to come into contact with one surface thereof. The web W travels in contact with the plurality of guide rollers 33, and after the paper dust adhering to the web W is removed by the first paper dust removing roller 31-1, printing by the rotary offset printing press 10 is performed. It reaches the device 13 and is printed.

  The fountain solution S is supplied from the outside into the main body 37 through the supply passage 37a, and is discharged out of the main body 37 through the discharge passage 37b. Then, when the first paper dust removing roller 31-1 is rotated while the first paper dust removing roller 31-1 is in contact with the web W, the paper dust removing roller is moved from the first water circulation device 32-1. The fountain solution S is pumped up by 31-1, and the fountain solution S is supplied to the surface of the first paper dust removing roller 31-1 and attached thereto. Since the first paper dust removing roller 31-1 is in contact with the surface of the web W, the fountain solution S adhering to the surface of the first paper dust removing roller 31-1 is the first paper dust. Along with the rotation of the removing roller 31-1, the surface of the first paper dust removing roller 31-1 on which the dampening water S is attached contacts the surface of the web W. Since the first paper dust removing roller 31-1 rotates in contact with the web W, the paper dust is adsorbed by the dampening water S and can be removed from the web W. Adhering paper dust can be reliably removed.

  The first paper dust removing roller 31-1 removes the paper dust adhering to the web W and then the first paper dust removing roller 31-1 adsorbing the paper dust adhering to the web W. The surface is fed to the first dampening water circulation device 32-1. The paper dust adhering to the first paper dust removing roller 31-1 is washed away with the dampening water S in the first dampening water circulating device 32-1, and the first paper dust removing roller 31-1 is wet. Since the water S is supplied and adhered, the paper powder removed from the web W can be used without being transferred to the web W again.

Further, on the other side of the web W on the downstream side of the first paper dust removing device 12A-1, a second paper dust removing device 12A-2 is provided, which is the same as the first paper dust removing device 12A-1. In addition, the paper dust on the other side of the web W is removed.
In this embodiment, the pair of paper dust removing devices 12A-1 and 12A-2 are provided on both sides of the web W, but may be provided only on one side of the web W.

  Further, a first drive motor (first drive means) (not shown) that adjusts the feed speed of the web W, the first paper dust removal roller 31-1, and the second paper dust removal roller 31-2 are driven to rotate. A second drive motor (second drive means) 35 and a control device (drive control means) 36 that controls the drive of the first drive motor and the second drive motor 35 (not shown). The control device 36 controls the drive speeds of the first drive motor and the second drive motor 35 (not shown) according to the operation state of the rotary printing press etc., so that the rotational speed of the web W and the first paper dust are controlled. The rotational speeds of the removing roller 31-1 and the second paper dust removing roller 31-2 are independently controlled.

  And the control apparatus 36 drive-controls the rotation speed of the 1st paper dust removal roller 31-1, the 2nd paper dust removal roller 31-2, and the feed speed of the web W so that it may differ, and it is 1st paper. The rotational speed of the dust removing roller 31-1 and the second paper dust removing roller 31-2 and the feed speed of the web W are set to a desired speed, that is, the difference between the peripheral speeds is appropriate. Thereby, the paper dust adhering to the web W can be more reliably removed. Thereby, generation | occurrence | production of a hickey can be prevented and print quality can be improved.

  Specifically, the printing speed, that is, the rotation speed of the web W is determined according to the type of design, sheet paper, ink, and the like, and the first paper dust removing roller 31-1, the second rotation speed of the web W is determined. The rotational speed of the second paper dust removing roller 31-2 is determined. Then, in consideration of the paper dust generation situation in the web W, the rotational speed of the first paper dust removing roller 31-1, the second paper dust removing roller 31-2 and the feeding speed of the web W are set and set appropriately. The rotational speeds of the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2 are adjusted and controlled in a stepless manner so as to be a value.

  That is, in the first dampening water circulation device 32-1 and the second dampening water circulation device 32-2, moisture is applied to the surfaces of the first paper dust removal roller 31-1 and the second paper dust removal roller 31-2. The water S is supplied, adhered, and brought into contact with the web W, whereby a predetermined amount of dampening water S is supplied to the web W to remove the paper dust adhering to the web W.

  Further, the rotational speeds of the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2 are made faster than the web W feed speed. Thereby, the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2 are slipped with respect to the surface of the web W, and the paper dust adhering to the web W is changed to the first paper dust. The paper dust on the web W can be prevented from being peeled off by the removal roller 31-1 and the second paper dust removal roller 31-2, and taken to the printing side as it is. Can be removed more effectively.

  Further, the first dampening water circulation device 32-1 and the second dampening water circulation device 32-2 partition the dampening water S supplied into the main body 37 and the dampening water S from which the paper dust is recovered. A partition plate 38 is provided. By separating the new dampening water S supplied to the main body 37 and the dampening water S containing paper dust by the partition plate 38, the first paper dust removing roller 31-1 and the second paper dust removing roller 31. -2 can be always supplied with fresh dampening water S. For this reason, the 1st paper dust removal roller 31-1 and the 2nd paper dust removal roller 31-2 do not use the dampening water S containing paper dust, but always use the fresh dampening water S to the web W. Since it can be supplied, the paper dust attached to the web W can be effectively removed without transferring the paper dust removed from the web W again to the newly fed web W.

  The first dampening water circulation device 32-1 and the second dampening water circulation device 32-2 are in pressure contact with the first paper dust removal roller 31-1 and the second paper dust removal roller 31-2, and The brush 39 is provided as a paper dust scraping means for removing the paper dust adhered to the paper dust removing roller 31-1 and the second paper dust removing roller 31-2. For this reason, the brush 39 contacts the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2, so that the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2 are in contact with each other. Paper dust can be removed from the roller 31-2, and paper dust removal performance can be improved. Thereby, the paper dust adhering to the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2 can be more effectively removed.

  Further, the paper powder can be lifted by the brush 39 from the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2 to reduce the adhesion force. Thus, the first paper dust removing roller 31-1 and the second paper dust removing roller 31 in the dampening water S of the first dampening water circulating device 32-1 and the second dampening water circulating device 32-2. -2 can be easily removed.

  Further, the paper dust adhering to the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2 can be scraped off by the brush 39, and the paper dust scraped off by the brush 39 can be used. Falls as it is and is collected in the main body 37 of the first dampening water circulation device 32-1 and the second dampening water circulation device 32-2. In addition to the brush, for example, a scraper, a removing roller, a brush roller, or the like is used as the paper dust scraping means, but the present invention is not limited to this.

  The rotational speeds of the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2 are adjustable, and the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2 are adjustable. By making the rotation speed of the roller 31-2 faster than the normal rotation speed of the first paper dust removing roller 31-1, the second paper dust removing roller 31-2, the web W and the first paper dust removing are performed. By increasing the slip ratio between the roller 31-1 and the second paper dust removing roller 31-2, the efficiency of removing the paper dust adhering to the web W can be further increased.

  Further, the normal rotational speeds of the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2 are determined and adjusted by the rotational speed of the web W as described above. There is no particular limitation.

  Further, the rotation speeds of the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2 are set to normal values of the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2. When the paper powder adhering to the web W is removed, the fountain solution S can be prevented from being scattered.

  The first dampening water circulation device 32-1 and the second dampening water circulation device 32-2 are used again after removing the paper dust in the dampening water S containing paper dust. . That is, the fountain solution S is supplied from the outside into the main body 37 through the supply passage 37 a and is discharged out of the main body 37 through the discharge passage 37 b. The discharged fountain solution S is removed from the paper powder in the fountain solution S by a filtration device (not shown), and then supplied again into the main body 37 through the supply passage 37a and used. Thereby, the running cost of an apparatus can be held down.

  As described above, according to the paper dust removing devices 10A and 10B according to the present embodiment, the paper dust adhered to the web W in contact with one surface of the web W is adsorbed by the dampening water S and removed. A dampening solution S is applied to the surfaces of the first paper dust removing roller 31-1, the second paper dust removing roller 31-2, the first paper dust removing roller 31-1, and the second paper dust removing roller 31-2. The first dampening water circulation device 32-1 and the second dampening water circulation device 32-2 that adsorb paper dust and adsorb paper dust and collect the recovered dampening water S are provided. Therefore, the paper dust adhering to the web W can be surely removed, and the paper dust adhering to the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2 is moistened. Since it is washed away with water S, fresh dampening water S is added to the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2. Supplied, the paper powder can be used without being transferred back to the web W.

  Further, in the paper dust removing apparatus 10A according to the present embodiment, the rotation direction of the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2 and the feeding direction of the web W are set in the same direction. However, the rotation direction of the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2 and the feeding direction of the web W may be reversed. Thereby, the paper dust adhering to the web W can be more efficiently peeled off by the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2.

  In the powder removing apparatus 10A according to the present embodiment, the pair of the first paper dust removing roller 31-1 and the second paper dust removing roller 31-2 are provided on the front and back surfaces of the web W. The present invention is not limited to this, and a paper dust removing roller may be provided only on one side of the web W. Further, two or more sets of paper dust removing rollers may be provided on the front and back surfaces of the web W.

  The present invention can be used in a rotary printing press, but is not limited to this, and can be applied to an image forming apparatus such as a copying machine, a facsimile, or a printer. In addition to removing paper dust such as cardboards or paper products, the present invention can also be applied to removing dust such as sheet-like plastic plates.

A paper dust removing apparatus according to a second embodiment of the present invention will be described with reference to FIG.
FIG. 3 is a conceptual diagram schematically showing the configuration of the paper dust removing device in the rotary offset printing press according to the second embodiment of the present invention. In addition, about the member similar to Example 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted. Further, the description of the entire rotary offset printing press is omitted, and only the portion of the paper dust removing device is described.

As shown in FIG. 3, in the rotary offset printing press 10 to which the paper dust removing device of Example 1 is applied, the first dampening water circulation device 32-1 has a first paper dust removing roller 31 via a roller. The dampening water S is supplied to -1.
That is, as shown in FIG. 3, the paper dust removing device 12B-1 according to the present embodiment is a first between the first dampening water circulation device 32-1 and the first paper dust removing roller 31-1. Has a first dampening water adjusting roller 41-1 for supplying the dampening water S of the dampening water circulation device 32-1 to the first paper dust removing roller 31-1. The rotational speed of the dampening solution adjusting roller 41-1 is controlled by the controller 36 by a drive motor (not shown).

  Therefore, by supplying the dampening water S to the first paper dust removing roller 31-1 via the first dampening water adjusting roller 41-1, the paper dust removing device 12B according to the present embodiment, the first An appropriate amount of dampening water S can be supplied to the paper dust removing roller 31-1 without supplying excessive dampening water S.

  Moreover, the 1st dampening water adjustment roller 41-1 arrange | positioned between the 1st dampening water circulation apparatus 32-1 and the 1st paper dust removal roller 31-1 is not limited to one. There may be two or more.

  Further, a second paper dust removing device 12B-2 is provided on the other side of the web W on the downstream side of the first paper dust removing device 12B-1, and the same as the first paper dust removing device 12B-1. A second dampening water adjusting roller 41-2 may be provided to supply an appropriate amount of dampening water S to the second paper dust removing roller 31-2.

  In the present embodiment, the first dampening water adjusting roller 41-1 and the second dampening water adjusting roller 41-2 are provided in both of the pair of paper dust removing devices 12A-1 and 12A-2. However, it may be provided only on one side.

  The paper dust removing apparatus according to the present invention improves the printing quality by removing paper dust attached to the printing paper using a paper dust removing roller to which dampening water is supplied and the dampening water is attached to the surface. It can be applied to any type of rotary printing press.

It is a schematic block diagram of the offset rotary printing press to which the paper dust removal apparatus which concerns on Example 1 of this invention was applied. It is a conceptual diagram which shows simply the structure of the paper dust removal apparatus in the offset rotary printing press of Example 1 of this invention. It is a conceptual diagram which shows simply the structure of the paper dust removal apparatus which concerns on Example 2 of this invention. It is a figure which shows an example of a structure of the conventional paper dust removal apparatus. It is a figure which shows the other structure of the conventional paper dust removal apparatus.

Explanation of symbols

12 paper dust removing device 12A-1, 12B-1 first paper dust removing device 12A-2, 12B-2 second paper dust removing device 31-1 first paper dust removing roller 31-2 second paper Powder removal roller 32-1 First dampening water circulation device 32-2 Second dampening water circulation device 33 Roller 35 Second drive motor (second drive means)
36 Control device (drive control means)
37 Main body 38 Partition plate 39 Brush 41-1 and 41-2 Dampening water adjustment roller W Web S Dampening water

Claims (12)

In the paper dust removing device that removes the paper dust adhering to the printing paper while contacting at least one surface of the printing paper to be conveyed,
At least one paper dust removing roller impregnated with moisture that contacts one surface of the printing paper and removes paper dust adhering to the printing paper;
A paper dust removing device comprising a moisture circulating device for supplying moisture to the surface of the paper dust removing roller and collecting the adsorbed paper dust together with moisture. In claim 1,
The paper dust removing device, wherein the water circulation device has a partition plate for partitioning the water supplied into the main body and the water recovered from the paper dust. In claim 1 or 2,
First driving means for adjusting the feeding speed of the printing paper;
Second driving means for driving and rotating the paper dust removing roller;
Drive control means for drivingly controlling the first drive means and the second drive means,
A paper dust removing device, wherein a rotation speed of the paper dust removing roller is different from a feeding speed of the printing paper. In any one of Claims 1 thru | or 3,
A paper dust removing device, wherein a rotation speed of the paper dust removing roller is faster than a feeding speed of the printing paper. In any one of Claims 1 thru | or 4,
The paper dust removing device, wherein the water circulation device has a paper dust scraping means for peeling the paper dust attached to the paper dust removing roller. In any one of Claims 1 thru | or 5,
A paper dust removing device characterized in that the rotational speed of the paper dust removing roller is made faster than the normal rotational speed of the paper dust removing roller. In any one of Claims 1 thru | or 5,
A paper dust removing device, characterized in that a rotation speed of the paper dust removing roller is slower than a normal rotating speed of the paper dust removing roller. In any one of Claims 1 thru | or 7,
The paper dust removing device, wherein the moisture circulating device uses the moisture again after removing the paper dust from the moisture recovered from the paper dust. In any one of Claims 1 thru | or 8,
The paper dust removing device, wherein the moisture circulating device supplies moisture to the paper dust removing roller via at least one moisture adjusting roller. In any one of Claims 1 thru | or 9,
A paper dust removing device, wherein the water is dampening water. A paper feeder for feeding a roll-shaped web;
The paper dust removing device according to any one of claims 1 to 10, wherein paper dust on at least one surface of the web fed from the paper feeding device is removed.
A printing device for printing on the web;
A drying device for drying the ink printed on the web;
A cooling device for cooling the web after drying;
A rotary printing machine comprising a paper discharge device for discharging the web after cooling.   A paper dust removing method, comprising: removing paper dust adhering to printing paper conveyed using the paper dust removing device according to any one of claims 1 to 10.

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