JP2008213184A - Guiding structure of recording medium, printing machine and coating equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress damaging of a printing surface of a recording medium. <P>SOLUTION: A gas blowing pipe 20 which blows air A against an impression cylinder 11 is provided in a gap 10G of a plate cylinder 10. On the occasion when a printing sheet S passes through an clearance C between the plate cylinder 10 and the impression cylinder 11, the air A is blown against the impression cylinder 11 from the gas blowing pipe 20. Since the printing sheet S passing through the clearance C is subjected thereby to a pressing force directed to the impression cylinder 11, the irregularity of the position of the printing sheet S due to jumping is suppressed. Since the contact of the printing surface of the printing sheet S with the plate cylinder 10 or a peripheral structure thereof is thereby suppressed, damaging of the printing surface can be suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a recording medium guide structure, a printing machine, and a coating apparatus that can suppress scratches on a printing surface.

  2. Description of the Related Art A sheet guide device used to introduce a sheet into a blanket cylinder or a gap formed between a plate cylinder and an impression cylinder in a sheet printing machine is known. For such a sheet guide device, in order to satisfactorily introduce a printed material into the gap, for example, Patent Document 1 discloses a sheet that causes blowing air to flow out from a plurality of openings and applies pressure energy to the printing unit. A leaf paper guide device is disclosed.

Japanese Patent No. 3269608, paragraph numbers 0019 and 0020, FIG.

  However, in the technique disclosed in Patent Document 1, the sheet guide device projects to the upstream side in the conveyance direction of the recording medium. For this reason, when the holding of the recording medium by the impression cylinder and the intermediate cylinder (or the reversing device) is finished, particularly in the recording medium having high rigidity, the rear end portion in the traveling direction of the recording medium jumps up, and the recording medium There is a risk that the posture may be disturbed and contact the sheet guide device. As a result, scratches may occur on the printing surface of the recording medium.

  Therefore, the present invention has been made in view of the above, and an object of the present invention is to provide a recording medium guide structure, a printing machine, and a coating apparatus that can suppress damage to the printing surface of the recording medium. To do.

  In order to solve the above-described problems and achieve the object, the recording medium guide structure according to the present invention has a structure in which the recording medium passes through a gap formed between opposing cylinders. During the passage of the recording medium, gas blowing means for blowing gas toward one cylinder is provided on one cylinder.

  As a result, the recording medium passing through the gap formed between the opposing cylinders is given a force from the cylinder provided with the gas blowing means toward the cylinder facing the cylinder. As a result, it is possible to suppress the recording medium from coming into contact with the drum and its surrounding structures, and thus it is possible to suppress damage to the printing surface of the recording medium.

  As a preferred aspect of the present invention, in the recording medium guide structure according to the present invention, the gas spraying means is provided on a cylinder to which a coating agent transfer means for transferring the coating agent to the recording medium is attached. Is preferred. Since it is fed by a cylinder opposite to the cylinder on which the coating agent transfer means is mounted, it tends to move away from the cylinder surface due to centrifugal force, and this causes damage to the printing surface of the recording medium due to contact with the structure around the cylinder. Likely to happen. However, since the printing surface of the recording medium can be repelled while being held along the surface of the cylinder opposite to the cylinder to which the coating agent transfer means is attached by blowing the gas, the printing surface of the recording medium Scratches can be more effectively suppressed.

  As a desirable mode of the present invention, in the recording medium guide structure according to the present invention, it is preferable that the gas spraying unit is provided inside a coating agent transfer unit fixing portion that fixes the coating agent transfer unit. Thereby, it is possible to suppress the gas blowing means from protruding from the surface of the cylinder, and it is possible to effectively use the space in which the coating agent transfer means fixing portion is free.

  As a desirable mode of the present invention, in the recording medium guide structure according to the present invention, when gas is blown from the gas blowing means, the gas blowing port of the gas blowing means is made to face the other cylinder. Is preferred. Accordingly, it is possible to reliably blow the gas onto the recording medium, forcibly suppress the movement of the recording medium to move away from the other cylinder, and suppress the contact of the recording medium.

  As a desirable mode of the present invention, in the recording medium guide structure according to the present invention, the gas spraying means is a gas spray tube in which a plurality of gas spray ports are formed as the gas spray ports, The gas injection port is preferably formed along the tube axis of the gas spray tube. As a result, the gas can be blown substantially uniformly in the width direction of the recording medium, and the posture of the recording medium can be stabilized during the conveyance of the recording medium.

  As a desirable aspect of the present invention, in the recording medium guide structure according to the present invention, the gas spraying means is opposed to a cylinder provided with the gas spraying means from a rotation shaft of the cylinder provided with the gas spraying means. It is preferable that the gas is blown toward the rotation axis of the cylinder. Accordingly, the recording medium can be moved away from one cylinder by efficiently using the force of the gas, so that the scratch on the printing surface of the recording medium can be more effectively suppressed.

  As a desirable mode of the present invention, in the recording medium guide structure according to the present invention, the cylinder provided with the gas blowing means intermittently drives a driving force for driving the cylinder provided with the gas blowing means. It is preferable to have a driving force interrupting means. Thereby, the direction which a gas spraying means blows gas can be fixed reliably.

  As a desirable aspect of the present invention, in the guide structure of the recording medium according to the present invention, at least one of the gas blowing amount and the blowing pressure according to the conditions for recording the image line image on the recording medium. It is preferable to change one. Further, as a desirable aspect of the present invention, it is preferable that the direction in which the gas blows out is also changed in the recording medium guide structure according to the present invention. Thereby, for example, the gas blowing condition can be changed according to the rigidity of the recording medium, so that the recording medium can be more reliably moved away from one cylinder. As a result, scratches on the printing surface of the recording medium can be more reliably suppressed.

  In order to solve the above-described problems and achieve the object, the printing machine according to the present invention is configured such that, in the guide structure of the recording medium, the gas spraying means transfers ink transferred from a plate to the recording medium. It is provided in a blanket cylinder, and the gas is blown out toward the impression cylinder with respect to the blanket cylinder.

  As a result, in a unit that does not require transfer in offset printing, the recording medium passing through the gap formed between the blanket cylinder and the impression cylinder facing the unit is pressed from the blanket cylinder by the gas blowing means. A force toward the trunk is applied. As a result, it is possible to suppress the recording medium from coming into contact with the blanket cylinder and the surrounding structures, so that the printing surface of the recording medium can be prevented from being damaged.

  In order to solve the above-described problems and achieve the object, a printing machine according to the present invention provides a gas jetting image formed on a printing plate by using the gas blowing means in the recording medium guide structure. It is provided in a plate cylinder to be transferred to the recording medium, and the gas is blown out toward the impression cylinder with respect to the plate cylinder.

  As a result, in printing in which a line image is directly transferred from a printing plate to a recording medium, the recording medium passing through a gap formed between a printing cylinder on which the printing plate is mounted and an impression cylinder facing the printing cylinder is not used. The gas blowing means applies a force from the plate cylinder to the impression cylinder. As a result, since the recording medium can be prevented from coming into contact with the plate cylinder and the surrounding structure, it is possible to suppress damage to the printing surface of the recording medium.

  In order to solve the above-described problems and achieve the object, a coating apparatus according to the present invention includes a recording medium guide structure in which the gas spraying unit is coated with a protective agent such as a varnish for protecting a printing surface. It is provided in the plate cylinder transferred to the printing surface of the recording medium, and the gas is blown out toward the impression cylinder with respect to the plate cylinder.

  Thus, in a coating apparatus for applying a protective agent such as varnish to the printing surface of the recording medium, a plate cylinder on which a coating plate for applying the protective agent is applied when coating is not required. The recording medium passing through the gap formed between the plate cylinder and the pressure cylinder is applied with a force from the plate cylinder toward the pressure cylinder by the gas blowing means. As a result, since the recording medium can be prevented from coming into contact with the plate cylinder and the surrounding structure, it is possible to suppress damage to the printing surface of the recording medium.

  The recording medium guide structure, the printing machine, and the coating apparatus according to the present invention can suppress scratches on the printing surface of the recording medium.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited by the best mode for carrying out the invention (hereinafter referred to as an embodiment). In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Although the example which applied this invention to the coating apparatus which apply | coats the varnish after printing is demonstrated below, the application object of this invention is not limited to a coating apparatus. Regardless of the printing method of the printing press, what is printed on a recording medium via a so-called blanket, such as offset printing, or directly from a plate, not via a blanket, such as flexographic printing or gravure printing You may print to. Ink and varnish correspond to the coating agent transferred to the recording medium, and the varnish also corresponds to a protective agent for protecting the printing surface.

  In the present embodiment, when a recording medium passes through a gap formed between opposing cylinders, at least while the recording medium passes through the gap, from one cylinder to the other cylinder. By blowing the gas, the printing sheet passing through the gap gives a force toward the other cylinder to control the posture of the printing sheet, and the printing surface of the printing sheet comes into contact with the cylinder and surrounding structures. It is characterized in that this is suppressed.

  FIG. 1 is an overall configuration diagram of a printing press according to the present embodiment. A printing machine 1 shown in FIG. 1 includes a paper feeding unit 2 that feeds and feeds printing sheets S, which are recording media to be used for printing, one by one, and a printing sheet S conveyed along the traveling direction of the printing sheet S. A printing unit 3 for printing on the cylinder, a cylinder extension unit 4, a coating device 5 for applying a varnish to the printed surface of the printed sheet S, a paper discharge extension unit 6, and a coated printing sheet S. And a paper discharge unit 7 for paper discharge. The printing press 1 is controlled by the printing press control device 25. Further, an electric motor 18 is used as a driving unit of the printing machine 1.

  The printing unit 3 includes a plurality of printing units 3A to 3E so that different colors can be printed to realize color printing. Each of the printing units 3A to 3E is provided along the traveling direction of the printing sheet S for each color to be printed. Each of the printing units 3A to 3E includes a plate cylinder DH, a blanket cylinder DB, and an impression cylinder DP. The plate cylinder DH, the blanket cylinder DB, and the impression cylinder DP are disposed so as to contact each other in this order from the upper side to the lower side in the vertical direction. Thus, the printing machine 1 is a so-called offset printing machine. The plate cylinder DH, the blanket cylinder DB, and the impression cylinder DP are each formed in a cylindrical shape, and are provided so that the rotation axis thereof intersects the traveling direction of the printing sheet S horizontally. The plate cylinder DH, the blanket cylinder DB, and the impression cylinder DP are provided so as to be rotatable about the rotation axis.

  The plate cylinder DH is mounted with a printing plate for forming a printed image on the peripheral surface. A blanket formed of an elastic material is attached to the peripheral surface of the blanket cylinder DB. The blanket is transferred to the printing plate included in the plate cylinder DH, and the ink that forms the image is transferred to the blanket. The blanket cylinder DB transfers the image to the printing sheet S. In other words, the blanket is a coating agent transfer unit that transfers the coating agent ink to a recording medium. Note that in a method of transferring ink directly from a printing plate to a recording medium, such as flexographic printing or gravure printing, the printing plate serves as a coating agent transfer means.

  The impression cylinder DP applies a predetermined printing pressure to the printing sheet S in cooperation with the blanket cylinder DB. The diameter of the impression cylinder DP is twice the diameter of the plate cylinder DH and the blanket cylinder DB. Thus, the impression cylinder DP is configured as a so-called double cylinder with respect to the plate cylinder DH and the blanket cylinder DB.

  The printing sheet S supplied from the paper supply unit 2 is first supplied between the blanket cylinder DB and the impression cylinder DP of the printing unit 3A located on the most upstream side, and then the pressure of the downstream printing unit 3B. By being transferred to the cylinder DP, it is conveyed through the printing units 3A to 3E, and ink is transferred one after another in the process.

  The cylinder extension unit 4 includes a drying device 4H. For example, an infrared heater or a hot air drying device is used as the drying device 4H. Further, when an ultraviolet curable ink is used, an ultraviolet lamp is also used as the drying device 4H. The cylinder extension unit 4 dries the printed sheet S that has been printed by the printing unit 3 before the varnish is applied by the coating device 5.

  The coating device 5 is a device that applies varnish to the printing surface of the printing sheet S that has been dried by the cylinder extension unit 4 as a pretreatment for varnish coating. The coating device 5 includes a varnish base roller 13, a varnishing roller 12, a plate cylinder 10, and an impression cylinder 11. Then, the varnish on the surface of the plate cylinder 10 is applied to the printing surface of the printing sheet S in the process in which the printing sheet S passes between the plate cylinder 10 and the impression cylinder 11.

  The paper discharge extension unit 6 is for drying the varnish of the printing sheet S having the printing surface coated with the varnish by the coating device 5. The paper discharge extension unit 6 dries the varnish coated on the print sheet S by the drying device 6H in the process of transporting the print sheet S coated with the varnish by the coating device 5 toward the paper discharge unit 7. . Here, the paper discharge unit 7 conveys the print sheets S that have passed through the paper discharge extension unit 6 and stacks them in an aligned state.

  2 and 3 are overall configuration diagrams showing another configuration example of the printing press according to the present embodiment. The printing machine 1a shown in FIG. 2 has the same configuration as that of the printing machine 1 shown in FIG. 1, but is different in that it includes two coating devices. That is, the printing machine 1a includes a first coating device 5a and a second coating device 5b. The print sheet S on which the image line image is printed by the printing unit 3 is coated with varnish in the order of the first coating device 5a and the second coating device 5b.

  The printing machine 1b shown in FIG. 3 has the same configuration as the printing machine 1 shown in FIG. 1, except that it includes more printing units than the printing machine 1 shown in FIG. 1 and two cylinder extension units. Different. That is, the printing press 1b includes six printing units 3A to 3F, and includes a first cylinder extension unit 4A and a second cylinder extension unit 4B. Here, the printing machines 1, 1 a, and 1 b shown in FIGS. 1, 2, and 3 are configured to print on one side of the printing sheet S by providing a printing unit on one side of the printing sheet S that is a recording medium. A printing unit may be provided on both sides of the printing sheet S so that printing can be performed on both sides of the printing sheet S.

  FIG. 4 is a side view showing the configuration of the coating apparatus provided in the printing press according to the present embodiment. A concave portion is formed in the outer peripheral portion of the plate cylinder 10 constituting the coating apparatus 5 in parallel with a rotation axis (referred to as a plate cylinder rotation axis) Zh of the plate cylinder 10. This recess is referred to as a gap 10G. Both ends of the coating plate 16 are held in the gap 10G by a fixture 10F provided in the gap 10G. Here, the gap 10G and the fixture 10F constitute a coating agent transfer means fixing portion.

  The fixture is composed of an attachment claw 10T and a clamp 10C. One end of the coating plate 16 is hung on the attachment claw 10T, and the other end is fixed by the clamp 10C. As a result, the coating plate 16 is wound around and mounted on the outer peripheral portion of the plate cylinder 10. Further, the plate cylinder 10 provided in the coating apparatus 5 according to the present embodiment includes a gas blowing pipe 20 as a gas blowing means in the gap 10G, more specifically, in an empty space in the gap 10G, and a varnish Used when not coated. Thus, the gas spraying means is provided in an empty space inside the coating agent transfer means fixing portion. That is, the gas spraying means is provided inside the coating agent transfer means fixing portion and adjacent to the fixtures (that is, the mounting claws 10T and the clamp 10C) constituting the coating agent transfer means fixing portion.

  The coating plate 16 is in contact with a varnishing roller 12, and the varnishing roller 12 is in contact with a varnishing roller 13. The varnish former roller 13 pumps out the varnish N in the varnish cage 15 and adheres it to the varnishing roller 12. The varnish N adhering to the surface of the varnishing roller 12 moves to the surface of the coating plate 16 to form a coating film of the varnish N. The printed sheet S after printing conveyed from between the intermediate cylinder 14 and the impression cylinder 11 passes between the impression cylinder 11 and the plate cylinder 10. In the process, the varnish N on the coating plate 16 is applied to the printing surface of the printing sheet S. As described above, the coating plate 16 corresponds to a coating agent transfer unit that coats the varnish N that is a coating agent (protective agent) onto the printing surface of the printing sheet S that is a recording medium. Next, a case where no varnish is applied to the printed printing sheet S will be described.

  FIG. 5 is an enlarged side view showing a state of the coating apparatus according to the present embodiment when no varnish is applied. FIG. 6A is a conceptual diagram illustrating the behavior of a print sheet when no varnish is applied. FIG. 6B is a conceptual diagram illustrating the behavior of the print sheet in the present embodiment when no varnish is applied. When varnish N is not applied to the printed printing sheet S, a predetermined gap C is provided between the plate cylinder 10 and the impression cylinder 11. Then, the printing sheet S conveyed from between the intermediate cylinder 14 and the impression cylinder 11 passes through the gap C and is sent out to the paper discharge extension unit 6 shown in FIGS. When the printing sheet S passes between the impression cylinder 11 and the intermediate cylinder 14, the traveling direction of the printing sheet S (the direction indicated by the arrow L in FIG. 6-1, the traveling direction of the printing sheet) as shown in FIG. The end S_T on the rear side jumps up and tends to disturb the posture of the print sheet S. This is particularly noticeable in a highly rigid printed sheet such as cardboard or resin sheet.

  When the varnish N is applied, the printing sheet S is suppressed by the plate cylinder 10 and the impression cylinder 11 even if the end of the printing sheet S on the rear side in the traveling direction jumps up. However, when the varnish N is not applied, the gap C between the plate cylinder 10 and the impression cylinder 11 does not suppress the disorder of the posture of the print sheet S, and the print sheet S is not removed from the plate cylinder 10 or peripheral components. There is a risk of contact. If the printing surface comes into contact with the plate cylinder 10 while the printing sheet S is being conveyed, the printing surface of the printing sheet S may be damaged.

  Therefore, in the coating apparatus 5 according to the present embodiment, the printing sheet S that is a recording medium is conveyed by the following recording medium guide structure. As shown in FIG. 6B, this recording medium guide structure blows gas (air A in this embodiment) from the gas blowing tube 20 provided in the gap 10G toward the impression cylinder 11. . As a result, the printing surface of the printing sheet S and the plate cylinder are controlled by applying a pressing force to the printing sheet S toward the impression cylinder 11 and suppressing the disorder of the posture caused by the jumping of the printing sheet S or the like. 10 is suppressed. The gas blown from the gas blowing tube 20 to the printing sheet S is not limited to the air A.

  The printing sheet S conveyed by the impression cylinder 11 is separated from the cylinder (impression cylinder 11) by centrifugal force. At this time, the printing sheet S bounces up, and the posture of the printing sheet S is disturbed. Therefore, between the opposing cylinders, the gas blowing port of the gas blowing tube 20 as the gas blowing means faces the cylinder facing the cylinder (the impression cylinder 11) that conveys the printing sheet S that is the recording medium, and the printing sheet. Air A, which is a gas, is blown toward the cylinder around which S is wound. Thereby, the disorder | damage | failure of the attitude | position of the printing sheet S can be suppressed effectively, and the damage | wound of a printing surface can be reduced.

  Here, in the offset printing, the gas blowing tube 20 is disposed in a gap that is provided on the blanket cylinder and attaches the blanket. Further, in a system in which ink is directly transferred from a printing plate to a recording medium, such as flexographic printing or gravure printing, a gas blowing tube 20 is disposed in a gap provided on a plate cylinder and attached to the printing plate.

  As shown in FIG. 6B, the blowing direction of the air A blown from the gas blowing pipe 20 is preferably a direction from the plate cylinder rotation axis Zh toward the rotation axis (impression cylinder rotation axis) Zp of the impression cylinder 11. . That is, in a plan view from a direction parallel to the plate cylinder rotation axis Zh (or the impression cylinder rotation axis Zp), the direction is preferably parallel to a straight line DX connecting the plate cylinder rotation axis Zh and the impression cylinder rotation axis Zp. . In this way, since the kinetic energy of the air A blown onto the printing sheet S can be efficiently converted into pressure (static pressure), the posture disorder of the printing sheet S can be effectively suppressed. .

  In addition, the blowing direction of the air A blown from the gas blowing pipe 20 is not limited to the said direction. For example, the blowing direction of the air A may be inclined with respect to the front or rear of the print sheet traveling direction L. Since the air A can be blown toward the end S_T of the printing sheet S on the rear side of the printing sheet traveling direction L when the blowing direction of the air A is inclined with respect to the rear of the printing sheet traveling direction L, the air A The jumping of the end portion S_T can be reduced, and the disorder of the posture of the printing sheet S can be more effectively suppressed. It is preferable that the blowing direction of the air A blown from the gas blowing pipe 20 is appropriately changed according to the conditions for recording the line image on the recording medium, that is, the printing conditions.

  FIG. 7 is a plan view showing a configuration of a plate cylinder provided in the coating apparatus according to the present embodiment. FIG. 8 is a view taken along the line BB in FIG. The plate cylinder 10 to which the recording medium guide structure described above is applied includes a plate cylinder drive shaft 10S by a frame (operation side frame) FC on the operation side of the printing press 1 and a frame (drive side frame) FD on the drive side. It is supported rotatably through the. Here, the operation side is the side on which the operation panel and the monitor 26 of the printing press control device 25 that controls the printing press 1 are arranged, and the drive side is a drive mechanism that drives the plate cylinder 10 and the impression cylinder 11. Is the side where it is placed.

  The gas blowing tube 20 described above is fixed in the gap 10G of the plate cylinder 10. The gas spray tube 20 may be removable and may be attached when varnish is not applied. By disposing the gas spray tube 20 in the gap 10G, when the air A is sprayed onto the printing sheet S when the varnish N is not applied, the coating plate 16 does not have to be removed from the plate cylinder 10, Workability is improved. The gas blowing tube 20 is hollow, and a plurality of gas injection ports (gas blowing ports of the gas blowing means) 21 are provided on the outer peripheral portion thereof in parallel with the tube axis direction. Since the gas blowing tube 20 is disposed in the gap 10G so that the tube axis direction is parallel to the plate cylinder rotation axis Zh, the gas injection ports 21 are arranged in a direction parallel to the plate cylinder rotation axis Zh. Accordingly, the gas ejection ports 21 are arranged in a direction substantially orthogonal to the traveling direction of the printing sheet S (the direction indicated by the arrow L in FIG. 5).

  As shown in FIG. 7, one end of the gas spray tube 20 is sealed with a sealing member 20E, and a gas introduction part 20I is provided at the other end. When the varnish N is not applied, the blower 24 serving as a gas supply unit and the connection member 22 attached to the gas introduction part 20I are connected by the gas supply pipe 23. When air is supplied from the blower 24 to the gas blowing tube 20, the gas blows out from the gas ejection port 21 toward the printing sheet S.

  The gas injection port 21 provided in the gas spray tube 20 may be directly formed in the gas spray tube 20 by perforating the outer periphery of the gas spray tube 20. However, as shown in FIG. 8, a nozzle 20 </ b> N having a throttle portion 20 </ b> NS may be provided on the outer peripheral portion of the gas blowing tube 20, and the outlet of the throttle portion 21 </ b> NS provided in the nozzle 20 </ b> N may be used as the gas injection port 21. This is preferable because the flow rate of the air A can be increased by the throttle portion 20NS of the nozzle 20.

  A drive mechanism for the plate cylinder 10 is disposed on the operation side of the plate cylinder 10 (that is, on the operation side frame FD side). The plate cylinder 10 is driven by a driving force of an electric motor 18 that is a drive source of the printing press 1 via a plate cylinder driving gear 10IG attached to the plate cylinder driving shaft 10S. Between the plate cylinder driving gear 10IG and the plate cylinder 10, a clutch 17 which is a driving force interrupting means is attached. The clutch 17 is a so-called dog clutch, and includes two clutch plates 17A and 17B that mesh with each other. The clutch plate 17A is attached to the plate cylinder drive shaft 10S, and the clutch plate 17B is coupled to the plate cylinder drive gear 10IG. . When the two mesh with each other, the driving force is transmitted from the plate cylinder driving gear 10IG to the plate cylinder driving shaft 10S. When the meshing between both is released, the driving force is transmitted from the plate cylinder driving gear 10IG to the plate cylinder driving shaft 10S. Is released. The format of the clutch 17 is not limited to the format of the present embodiment.

  With such a configuration, in the recording medium guide structure according to the present embodiment, when the varnish N is not applied to the printing sheet S, the clutch 17 is released and the driving force of the electric motor 18 to the plate cylinder 10 is released. Is cut off. Thereby, when the varnish N is not applied, the pressure drum 11 can freely rotate even when the plate cylinder 10 is stopped, so the gas spray tube 20 provided in the plate cylinder 10 is fixed, Gas can be blown onto the printing sheet S passing between the plate cylinder 10 and the impression cylinder 11.

  Further, in the recording medium guide structure applied to the coating apparatus 5 according to the present embodiment, a plate cylinder braking device 19 for stopping the rotation of the plate cylinder 10 is provided in the drive side frame FD. The plate cylinder braking device 19 stops the rotation of the plate cylinder 10 by applying a frictional force to the plate cylinder drive shaft 10S. As a result, when air is blown from the gas blowing tube 20 to the printing sheet S, it is fixed to the drive side frame FD which is a stationary system, so the direction of the air A blown from the gas blowing tube 20 is kept constant. Thus, the disorder of the posture of the printing sheet S can be suppressed stably.

  In the present embodiment, engagement and disengagement of the clutch 17 is controlled by a clutch control actuator 17C. The clutch control actuator 17C, the plate cylinder braking device 19, the electric motor 18, and the blower 24 are controlled by a printing press control device 25. This makes it possible to automate a series of controls for blowing air from the gas blowing tube 20 to the print sheet S when the varnish N is not applied. Note that the engagement and release of the clutch 17, the braking and release of the plate cylinder braking device 19, the ON / OFF of the blower 24, and the like may be performed manually regardless of the printing press control device 25. In this way, the clutch control actuator 17C is not necessary, and the cost can be reduced accordingly.

  FIG. 9 is a flowchart showing an example of the procedure for controlling the posture of the print sheet when no varnish is applied. Note that the printing sheet orientation control is executed on the condition that the operation of the printing machine 1 shown in FIG. 1 or the printing machine 1a (hereinafter referred to as the printing machine 1) shown in FIG. 2 is stopped. When the varnish N is not applied, first, the printing press control apparatus 25 shown in FIG. 7 selects a unit that is not used (step S101). In this example, since the varnish N is not applied, the unit not used is the coating device 5. In the printing press 1b shown in FIG. 3, a printing unit that is not used for printing may be selected from the printing units 3A to 3F.

  When the unit not to be used is selected, the printing press control device 25 shown in FIGS. 1 and 7 acquires the printing conditions in the next job (step S102), and based on this, the air blown from the gas blowing tube 20 to the printing sheet S The balloon condition for A is set (step S103). The printing conditions include, for example, the type of the printing sheet S, the thickness of the printing sheet S, the printing speed, the temperature, the humidity, and the density of the image line image. If the printing conditions such as the type of the printing sheet S and the thickness of the printing sheet S are different, the behavior of the printing sheet S when passing through the gap C between the plate cylinder 10 and the impression cylinder 11 may be different. Depending on the printing conditions such as the type of the sheet S and the thickness of the printing sheet S, the blowing angle of the air A is changed or the blowing amount of the air A is adjusted.

  Here, the printing press control apparatus 25 according to the present embodiment is configured to store the printing conditions and the air A blowing conditions once set. When printing is performed again under similar printing conditions, the stored air A blowing conditions are called, and air A is blown out under these conditions. Thereby, the trouble of setting the air A blowing condition can be reduced.

  For example, when the thickness of the printing sheet S is large, the rigidity of the printing sheet S tends to be higher, so that the rebound when the regulation by the intermediate cylinder 14 and the impression cylinder 11 is released becomes stronger, and the plate cylinder 10 There is also a high risk of contact. Therefore, for example, the print sheet S becomes thicker and the amount of air A blown out is increased. Thereby, the contact of the printing sheet S can be suppressed more reliably. The method for setting the air A blowing conditions based on the printing conditions is not limited to this.

  When the blowing condition of the air A blown from the gas blowing tube 20 to the printing sheet S is set (step S103), the blanket cylinder of the unused unit selected in step S101 or the clutch of the plate cylinder is released (step S104). In this example, since the unit that is not used is the coating device 5, the printing press control device 25 sends a clutch release command to the clutch control actuator 17 </ b> C shown in FIG. 7 and the clutch 17 (the coating device 5 shown in FIG. 7). The clutch provided in the plate cylinder 10 is released. Next, the printing press controller 25 sends a braking command to the plate cylinder braking device 19 shown in FIG. 7 to place the plate cylinder braking device 19 in a braking state, thereby fixing the plate cylinder 10 to the drive side frame FD. (Step S105).

  In principle, the plate cylinder 10 has a gas injection port 21 of the gas blowing tube 20 facing the impression cylinder 11, and, as shown in FIG. 6-2, a straight line connecting the plate cylinder rotation axis Zh and the impression cylinder rotation axis Zp. Although it is fixed at a position where the gas injection port 21 is arranged on DX, it is not limited to this depending on printing conditions. For example, depending on the printing conditions, the gas ejection port 21 is arranged behind or in the traveling direction of the print sheet S, and the blowing direction of the air A from the gas ejection port 21 is directed toward the rear or front of the printing sheet S. May be inclined. The release of the clutch 17 in step S102 and the fixing of the plate cylinder 10 in step S103 may be reversed. Further, the release of the clutch 17 and the fixing of the plate cylinder 10 may be performed manually.

  When the clutch 17 is released and the plate cylinder 10 is fixed, the connecting member 22 is attached to the gas introduction part 20I of the gas blowing pipe 20, and the connecting member 22 and the blower 24 are connected by the gas supply pipe 23 (step S106). When the printing press control device 25 receives a command to start printing, the printing press control device 25 drives the blower 24 to supply air A to the gas blowing tube 20 (step S107). Then, when the air A starts to blow out from the gas injection port 21 of the gas blowing tube 20, the printing press control device 25 starts printing (step S108). In this way, when the printing sheet S passes between the plate cylinder 10 and the impression cylinder 11 by starting printing after the air A starts to be blown out from the gas ejection port 21, the air is reliably supplied to the printing sheet S. A can be blown out. As a result, the disorder of the posture of the printing sheet S can be reliably suppressed, and the scratching of the printing sheet S can be suppressed.

  10 and 11 are schematic views showing modifications of the attachment position of the gas blowing tube. The gas blowing tube 20 provided in the plate cylinder 10 of the coating apparatus 5 is preferably arranged at the center of the gap 10G in the circumferential direction of the plate cylinder 10 as shown in FIG. However, when the gas blowing tube 20 cannot be disposed in the center due to the structure of the gap 10G, it is disposed in front of the print sheet traveling direction L as shown in FIG. 10, or as shown in FIG. You may arrange | position behind the advancing direction L. In this case, the blowing direction of the air A is set to be parallel to a straight line DX connecting the plate cylinder rotation axis Zh and the impression cylinder rotation axis Zp at a position where the gap 10G of the plate cylinder 10 is opposed to the impression cylinder 11. It is preferable to do.

  FIG. 12 is a schematic diagram showing a modified example of the gas blowing tube mounting structure. FIG. 13 is an explanatory diagram showing the operation of the gas blowing tube. As shown in FIG. 13, the gas blowing tube 20 shown in FIG. 12 is configured to be rotatable about the tube axis Zc. The gas blowing tube 20 may be rotated using a dedicated actuator, or may be manually rotated. As shown in FIG. 13, by rotating the gas blowing tube 20 around the tube axis Zc (in the direction of arrow R in FIG. 13), the direction of the nozzle 20N changes, so the direction of the air blown from the gas injection port 21 also changes. To do.

  In this embodiment, at the position where the gap 10G of the plate cylinder 10 faces the impression cylinder 11, the air blowing direction is in principle parallel to the straight line DX connecting the plate cylinder rotation axis Zh and the impression cylinder rotation axis Zp. (Arrow A1 in FIGS. 12 and 13). When the gas blowing tube 20 is rotated about the tube axis Zc, the air blowing direction is set to the rear of the printing sheet traveling direction L without rotating the plate cylinder 10 (arrow A2 in FIG. 12), or the printing sheet proceeds. Or forward in the direction L (arrow A3 in FIG. 12).

  Thus, the air blowing direction can be changed even after the plate cylinder 10 is fixed. Further, since the gas blowing pipe 20 is disposed at a position away from the plate cylinder rotation axis Zh in the radial direction of the plate cylinder 10, the change in the air blowing direction with respect to the rotation of the plate cylinder 10 becomes large, and the air It is difficult to fine-tune the blowing direction of On the other hand, in this modified example, since the gas blowing tube 20 itself arranged at a position closer to the print sheet S is rotated around the tube axis Zc of the gas blowing tube 20, the air blowing with respect to the rotation of the gas blowing tube 20 is performed. The change in direction can be reduced. As a result, fine adjustment can be performed more easily than when the plate cylinder 10 is rotated to finely adjust the air blowing direction.

  Furthermore, since the air blowing direction can be changed even during printing, the air blowing direction can be changed without rotating the plate cylinder 10 even when environmental conditions such as humidity and temperature change during printing. That is, when the plate cylinder 10 is rotated, it is necessary to engage the clutch 17 shown in FIG. 7, and for this purpose, it is necessary to stop printing once, which may cause a decrease in productivity. However, in this modified example, since the air blowing direction can be changed while the plate cylinder 10 is fixed, it is not necessary to stop printing, and productivity does not decrease. In addition, since the printing sheet S can be monitored in a jumping state, and the air blowing direction can be feedback-controlled according to the monitoring state, the posture of the printing sheet S passing between the plate cylinder 10 and the impression cylinder 11 can be improved. It can be controlled precisely. Thus, in this modification, the freedom degree at the time of controlling the attitude | position of the printing sheet S can improve, and a precision can be improved.

  FIG. 14A and FIG. 14B are schematic diagrams illustrating a modification of the guide structure of the recording medium. FIG. 15 is a schematic diagram showing a cross section of the guide structure of the recording medium shown in FIGS. 14-1 and 14-2. In the recording medium guide structure according to this modification, the gas blowing pipe 20 is not provided in the gap 10G, but a plurality of gas injection ports 10N are provided in the outer peripheral portion of the plate cylinder 10a while avoiding the gap 10G. The plurality of gas injection ports 10N are arranged in parallel with the plate cylinder rotation axis Zh. Further, it is disposed in the vicinity of the gap 10G (about 1/5 to 1/2 of the width of the gap 10G in the circumferential direction of the plate cylinder 10).

  In the example shown in FIG. 14A, since the coating plate 16 is mounted on the plate cylinder 10a at the time of varnish coating, the coating plate 16 is removed when air is blown from the gas injection port 10N. There is a need. In the example shown in FIG. 14B, the opening 16H is formed in the coating plate 16 at the position where the gas injection port 10N is provided. For this reason, in the example shown to FIGS. 14-2, when air is blown out from 10 N of gas injection ports, it is not necessary to remove the coating plate 16 and workability | operativity improves. As shown in FIG. 15, a gas supply passage 10AS is formed at the center of the plate cylinder 10a, and the gas injection port 10N is connected to the gas supply passage 10AS inside the plate cylinder 10a. By supplying air to the gas supply passage 10AS, the air A is blown out from the respective gas injection ports 10N toward the printing sheet S.

  Since the plate cylinder 10b rotates at a high speed, it is necessary to consider the centrifugal force due to the rotation of the plate cylinder 10b when the gas blowing tube 20 is attached. In this modification, it is necessary to provide the gas blowing tube 20 on the plate cylinder 10b. Therefore, it is not necessary to consider the centrifugal force due to the rotation of the plate cylinder 10b. This facilitates design. With the configuration as in this modified example, the posture of the printing sheet S passing between the plate cylinder 10a and the impression cylinder 11 may be controlled when the varnish N is not applied.

  FIG. 16 is a schematic diagram showing a modification of the guide structure of the recording medium. FIG. 17 is a schematic view showing a cross section of the guide structure of the recording medium shown in FIG. In the recording medium guide structure according to this modification, the gas blowing pipe 20 is not provided in the gap 10G, but a plurality of gas injection ports 10N are provided directly in the gap 10G. The plurality of gas injection ports 10N are arranged in parallel to the plate cylinder rotation axis Zh in the gap 10G. As shown in FIG. 16B, a gas supply passage 10AS is formed at the center of the plate cylinder 10b, and the gas injection port 10N is connected to the gas supply passage 10AS inside the plate cylinder 10b. By supplying air to the gas supply passage 10AS, the air A is blown out from the respective gas injection ports 10N toward the printing sheet S.

  According to this configuration, there is no need to provide the gas blowing pipe 20 in the gap 10G, so the number of parts can be reduced. Further, since the plate cylinder 10b rotates at a high speed, it is necessary to consider the centrifugal force due to the rotation of the plate cylinder 10b when the gas blowing tube 20 is attached. In this modification, the gas blowing tube 20 is provided on the plate cylinder 10b. Since there is no need to provide it, it is not necessary to consider the centrifugal force caused by the rotation of the plate cylinder 10b. This facilitates design. With the structure as in this modification, the posture of the printing sheet S passing between the plate cylinder 10a and the impression cylinder 11 may be controlled when the varnish N is not applied.

  In the above description, the case where the varnish is not applied by the coating apparatus 5 provided in the printing machine 1 or the like shown in FIG. 1 or the like is taken as an example, but the printing unit 3 of the printing machine 1 or the like is the same as the coating apparatus 5. In addition, the guide structure of the recording medium according to the present embodiment and its modification can be applied. For example, when the printer 1b shown in FIG. 3 is provided with multicolor printing units 3A to 3F, there are printing units that are not used depending on printing conditions. In this case, since the printed printing sheet S passes through the gap between the blanket cylinder DB and the impression cylinder DP of the printing unit, the printing sheet S is provided by the guide structure of the recording medium according to the present embodiment and its modification. Suppresses the posture disorder.

  As described above, in the present embodiment and the modifications thereof, when the printing sheet as the recording medium passes through the gap formed between the opposing cylinders, at least while the recording medium passes through the gap, By blowing gas from one cylinder to the other cylinder, the posture of the printing sheet passing through the gap is controlled, and the printing surface of the printing sheet is prevented from coming into contact with the cylinder and surrounding structures. . Thereby, the damage | wound which generate | occur | produces on a printing surface can be reduced. In particular, when the recording medium is a sheet that is not a continuous sheet, the recording medium is restricted by the impression cylinder and the intermediate cylinder when the recording medium passes through the gap between the plate cylinder and the impression cylinder. When the recording medium is released and the posture of the recording medium is disturbed, the effect of suppressing scratches on the printing surface is great.

  As described above, the recording medium guide structure, the printing machine, and the coating apparatus according to the present invention are useful when the recording medium passes through the gap formed between the cylinders facing each other. Suitable for suppressing scratches on the surface.

1 is an overall configuration diagram of a printing press according to an embodiment. It is a whole block diagram which shows the other structural example of the printing machine which concerns on this embodiment. It is a whole block diagram which shows the other structural example of the printing machine which concerns on this embodiment. It is a side view showing the composition of the coating device with which the printer concerning this embodiment is provided. It is an enlarged side view which shows the state of the coating device which concerns on this embodiment in the case of not coating a varnish. It is a conceptual diagram which shows the behavior of the printing sheet when not coating a varnish. It is a conceptual diagram which shows the behavior of the printing sheet in this embodiment in the case of not applying varnish. It is a top view which shows the structure of the plate cylinder with which the coating apparatus which concerns on this embodiment is provided. It is a BB arrow line view of FIG. It is a flowchart which shows the example of a procedure of the attitude | position control of a printing sheet in the case where varnish is not applied. It is a schematic diagram which shows the modification of the attachment position of a gas blowing tube. It is a schematic diagram which shows the modification of the attachment position of a gas blowing tube. It is a schematic diagram which shows the modification of the attachment structure of a gas blowing tube. It is explanatory drawing which shows operation | movement of a gas blowing tube. It is a schematic diagram which shows the modification of the guide structure of a recording medium. It is a schematic diagram which shows the modification of the guide structure of a recording medium. It is a schematic diagram which shows the cross section of the guide structure of the recording medium shown to FIGS. 14-1 and 14-2. It is a schematic diagram which shows the modification of the guide structure of a recording medium. FIG. 17 is a schematic diagram showing a cross section of the guide structure of the recording medium shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a, 1b Printing machine 2 Paper feed part 3 Printing part 4 Cylinder extension unit 5 Coating apparatus 6 Paper discharge extension unit 7 Paper discharge part 10, 10a, 10b Plate cylinder 10AS Gas supply path 1
10G Gap 10IG Plate cylinder drive gear 10N Gas injection port 10S Plate cylinder drive shaft 11 Pressure cylinder 12 Varnishing roller 13 Varnishing roller 14 Intermediate cylinder 16 Coating plate 16H Opening 17 Clutch 18 Electric motor 19 Plate cylinder braking device 20 Gas spraying Pipe 21 Gas injection port 24 Blower 25 Printer control device

Claims (12)

In a structure in which the recording medium passes through a gap formed between opposing cylinders,
A recording medium guide structure characterized in that a gas blowing means for blowing gas toward one of the cylinders is provided at least while the recording medium passes through the gap.   2. The recording medium guide structure according to claim 1, wherein the gas spraying means is provided on a cylinder to which a coating agent transfer means for transferring the coating agent to the recording medium is attached.   The guide structure for a recording medium according to claim 2, wherein the gas blowing unit is provided inside a coating agent transfer unit fixing portion that fixes the coating agent transfer unit.   4. The recording medium guiding structure according to claim 2, wherein when the gas is blown from the gas blowing unit, a gas blowing port of the gas blowing unit is opposed to the other cylinder.   The gas spraying means is a gas spray tube in which a plurality of gas spray ports are formed as the gas spray ports, and the plurality of gas spray ports are formed along a tube axis of the gas spray tube. The recording medium guide structure according to any one of claims 1 to 4.   The gas blowing means blows the gas from a rotating shaft of a cylinder provided with the gas blowing means toward a rotating shaft of a cylinder facing the cylinder provided with the gas blowing means. 6. A recording medium guide structure according to any one of 5 above.   The cylinder provided with the gas blowing means includes driving force interrupting means for interrupting a driving force for driving the cylinder provided with the gas blowing means. The guide structure of the recording medium as described in the above item.   8. The apparatus according to claim 1, wherein at least one of the blowing amount and the blowing pressure of the gas is changed according to a condition for recording a line image on the recording medium. Guide structure of the recording medium.   The recording medium guide structure according to claim 8, wherein the direction in which the gas blows is also changed.   The recording medium guide structure according to any one of claims 1 to 9, wherein the gas blowing means is provided in a blanket cylinder that transfers ink transferred from a plate to the recording medium, A printing machine configured to blow out the gas toward an impression cylinder.   The recording medium guide structure according to any one of claims 1 to 9, wherein the gas blowing means is provided on a plate cylinder that transfers an image line image of an ink formed on a printing plate to the recording medium. A printing machine characterized by being provided and configured to blow out the gas toward an impression cylinder with respect to the plate cylinder.   The recording medium guide structure according to any one of claims 1 to 9, wherein the gas blowing means is provided on a plate cylinder that transfers a protective agent for protecting a printing surface to the printing surface of the recording medium, A coating apparatus configured to blow out the gas toward an impression cylinder with respect to the plate cylinder.

Images