JP2009220401A - Sheet delivery device of printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet delivery device of a printing machine which can certainly wind a sheet around a conveying cylinder tightly. <P>SOLUTION: This sheet delivery device is structured in the following: a plurality of conveying cylinders 13 and 14, equipped with a gripper 11 for gripping the delivered sheet P by a click and a click rest, are arranged in the conveying direction, and a paper guide 22, for guiding the sheet P to be conveyed by the conveying cylinder 13 upstream in the conveying direction, is arranged. The sheet delivery device attached to the printing machine, forms an image by applying a colored ink to the sheet P by a roller. The paper guide 22 is equipped with a suction means 23 for sucking the sheet P to be conveyed by the conveying cylinder 13 upstream in the conveying direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes a plurality of transfer cylinders provided with grippers for holding a fed sheet with a nail base and a nail along a transfer direction, and is gripped by a gripper of a cylinder on the upstream side in the transfer direction. The present invention relates to a sheet delivery device in a printing press configured to deliver a sheet to a cylinder gripper on the downstream side in the transport direction.

Transfer the pattern of the ink or transfer film, for example, to the sheet delivered as described above, or print the image using an ultraviolet curable paint other than ink, and the ultraviolet rays on the printed sheet Various surface treatments may be performed on a sheet of paper, such as curing the paint by irradiating the curable paint with ultraviolet rays using a light emitting diode.
When the surface treatment is performed, for example, when the sheet is wound in a state of being floated with respect to the drum, the distance to the surface of the sheet is changed from the set distance, and thus the surface treatment is performed favorably. There are times when you can't.
Also, when performing double-sided printing, when the paper bottom of the sheet is gripped with a gripper in order to print the back side of the sheet on which the front side is printed, the sheet is placed on the cylinder as described above. If it is not in close contact, the gripping position of the paper bottom will deviate from the predetermined position, causing inconvenience that backside printing cannot be performed with high accuracy.

Therefore, the sheet is pressed against the paper guide wall plate arranged on the lower side of the feed cylinder by blowing air from an arc-shaped control slit provided in the feed cylinder.
In this way, a structure is proposed in which a frictional resistance force is generated between the paper guide wall plate and the sheet, and the sheet can be wound while closely contacting the impression cylinder on the delivery side. (For example, refer to Patent Document 1).
In addition, an opening is formed in the peripheral wall of the transfer drum to blow out air, and a fan for sending air into the barrel is attached to the partition plate provided at the end of the transfer drum in the width direction. The sheet is pressed against the sheet guide plate disposed on the lower side of the transfer cylinder by blowing out the air through the opening to the outside of the cylinder.
Accordingly, there is also proposed a configuration in which the sheet is wound while being in close contact with the drum on the downstream side in the transport direction by using the frictional resistance generated between the sheet guide plate and the sheet (for example, Patent Document 2).
Japanese Utility Model Publication No. 7-21344 (see FIG. 8) Japanese Patent No. 2786433 (see FIGS. 1 to 4)

In the configuration of Patent Document 1, a sheet of paper is applied to the cylinder on the downstream side in the conveyance direction by using frictional resistance generated when the sheet is pressed against the paper guide wall board using air from the control slit. However, when the sheet is wrapped around the surface of the cylinder on the downstream side in the conveying direction, the sheet floats from the cylinder. Or fluttered, and the sheet could not be sufficiently adhered to the trunk.
Similarly, the configuration of Patent Document 2 is a configuration in which air is blown out over the entire circumference of the cylinder, so that the sheet is lifted or fluttered from the cylinder in the same manner as described above. Could not be sufficiently adhered to the torso.
In addition, by reducing the gap between adjacent cylinders in the conveying direction, the sheet can be forcibly sandwiched between the cylinders at the transfer section of the cylinder and the sheets can be forcibly adhered to the transfer cylinder. Although it is conceivable, since the problem of scratches on the printing surface cannot be avoided, the gap between the cylinders adjacent in the transport direction is set to be larger than the thickness of the thickest sheet. .

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a sheet delivery device in a printing press capable of reliably winding a sheet while being in close contact with the cylinder.

The sheet delivery device in the printing machine of the present invention includes a plurality of transfer cylinders along a transfer direction, each having a gripper that holds a fed sheet with a nail base and a nail, and the transfer A sheet delivery device in a printing press having a paper guide for guiding a sheet conveyed by a cylinder on the upstream side in the direction, and applying colored ink to the sheet with a roller to form an image The paper guide includes a suction unit for sucking a sheet conveyed by a cylinder on the upstream side in the conveyance direction, and the sheet guide is sucked by the suction unit by a suction resistance. It is characterized in that a tension is applied to the sheet that is wound around the drum on the downstream side.
As described above, by applying a tension to the sheet wound around the cylinder on the downstream side in the transport direction by the suction resistance by which the sheet is sucked by the suction means, the sheet becomes a cylinder on the downstream side in the transport direction. The sheet can be wound while closely contacting the surface of the cylinder on the downstream side in the transport direction without any gaps.

  A blower pipe for blowing air blow on the sheet conveyed by the upstream cylinder in the conveying direction is provided inside the cylinder, and the sheet is applied to the paper guide by blowing air blow from the blower pipe. It may be pressed.

  The suction means includes a plurality of suction holes formed in the paper guide and a vacuum device for sucking air from the suction holes. Of the opening area per unit area by the suction holes, the sheet The opening area on the downstream side in the transport direction may be made larger than the opening area on the upstream side in the transport direction.

  You may form the guide surface of the conveyance direction downstream end part of the said paper guide so that it may follow the tangential direction in the sheet | seat delivery part of the trunk | drum downstream of this conveyance direction.

  A reversing mechanism capable of performing double-sided printing by reversing the printing surface of the sheet may be provided.

  By applying tension to the sheet that is wound around the drum on the downstream side in the conveyance direction by the suction resistance by which the sheet is sucked by the suction means, air is blown to the sheet and the sheet is guided to the sheet guide wall plate. When transporting in a predetermined posture while pressing the paper, the sheet does not float or flutter from the cylinder on the downstream side in the transport direction, and the sheet on the surface of the cylinder on the downstream side in the transport direction It is possible to provide a sheet delivery device in a printing machine capable of winding a paper while making sure that the paper is firmly attached without a gap.

A blower pipe for blowing an air blow to a sheet conveyed by a cylinder on the upstream side in the conveying direction is provided inside the cylinder, and the sheet is applied to the paper guide by blowing an air blow from the blower pipe. By pressing, a large frictional resistance force is generated between the sheet and the paper guide due to a synergistic effect with the suction force, and the sheet is more firmly adhered to the cylinder than in a configuration in which no frictional resistance is applied. It can be wound around.
Further, since the sheet is pressed against the paper guide, the printing surface of the sheet is not brought into contact with the cylinder, and the generation of scratches on the printing surface due to the contact can be avoided.
Further, since the air blow from the blower pipe is blown onto the sheet, there is an advantage that the ink transferred onto the printing surface of the sheet can be quickly dried.

  The suction means includes a plurality of suction holes formed in the paper guide and a vacuum device for sucking air from the suction holes. Of the opening area per unit area by the suction holes, the sheet By increasing the opening area on the downstream side in the transport direction more than the opening area on the upstream side in the transport direction, especially by increasing the tension force in the downstream region in the transport direction of the sheet that requires suction force, The paper can be wound in a state in which the paper is more closely attached to the cylinder.

  The sheet in a state of being sucked by the paper guide by forming the guide surface at the downstream end portion in the transport direction of the paper guide along the tangential direction in the sheet delivery section of the drum on the downstream side in the transport direction. By further increasing the tension force on the paper sheet, the sheet can be wound in a state where the sheet is more firmly adhered to the cylinder.

Hereinafter, an embodiment of a sheet delivery device in a printing machine according to the present invention will be described with reference to the drawings.
FIG. 1 shows a printer capable of switching between single-sided printing and double-sided printing.
This printing machine is a four-color printing machine, and a sheet feeding unit 1 for feeding sheets P one by one from a sheet stacking unit by a feeder device or a sheet separating device, and a sheet from the sheet feeding unit 1 A printing unit 2 for printing an image on the paper P and a paper discharge unit 3 for discharging the printed sheet are provided. The image is formed by applying colored ink such as cyan, magenta, yellow, and black to a sheet with a roller.

  The printing unit 2 includes four printing units 4, 5, 6, and 7, and is a sheet of paper between the second printing unit 5 and the third printing unit 6 counted from the paper feeding unit 1. A delivery device A is provided.

The printing units 4 to 7 are provided with printing impression cylinders 4A to 7A, and each of the printing impression cylinders 4A, 5A, 6A, and 7A includes an impression cylinder 5A on the downstream side in the transport direction of the sheet P. The transfer cylinder 8 or 9 for delivering to 7A is provided. A transfer cylinder 10 having a smaller diameter than other cylinders, which is also called a sheet feeding cylinder, is provided on the upstream side of the impression cylinder 4A located on the start end side in the transport direction.
Plate cylinders 4B-7B and rubber cylinders 4C-7C are provided for the impression cylinders 4A-7A.

  Each of the cylinders 4A to 7A and the transfer cylinders 8 and 9 includes grippers 11 for gripping the fed sheet P with the claw base and the claw at two places in the circumferential direction. Although not shown, the transfer cylinder 10 having a small diameter is provided with a gripper for gripping the sheet P with a claw base and a claw at one place in the circumferential direction.

  When single-sided printing is performed by the printing machine having the above-described configuration, the four printing units 4 to 7 can perform four-side printing on one side of the sheet P without reversing the front and back of the sheet with the reversing cylinder 12 described later. When performing color printing and duplex printing, two upstream printing units 4 and 5 print two colors on one side, and then the reversing cylinder 12 (described later) provided in the sheet delivery apparatus A is used. Then, the sheet is turned upside down, and the other side is printed in two colors by the printing units 6 and 7 on the downstream side. 2A, 2 </ b> B, and 2 </ b> C show a case where a sheet is received without reversing the front and back of the sheet by the reversing cylinder 12 in order to perform four-color printing on one side of the sheet P. Is shown. When the sheet is turned upside down by the reversing cylinder 12 to perform double-sided printing, the sheet is conveyed by the transfer cylinder 14 by the gripper 11 of the reversing cylinder 12 as described in FIG. In order to grip the paper bottom of the sheet P, the transfer cylinder 14 is positioned at a position rotated approximately 90 degrees from the rotation position in the figure. Then, after gripping the bottom edge of the sheet P at the rotational position, the gripper 11 is inverted and the sheet P being gripped is inverted and transferred to the impression cylinder 6A.

The sheet delivery apparatus A receives a sheet P from the second impression cylinder 5A in the conveying direction and a sheet P from the first delivery cylinder 13 and receives the sheet P from the first transfer cylinder 13. A second transfer cylinder 14 to be transferred to 12, and a reverse state in which the sheet P from the second transfer cylinder 14 is received and reversed to be transferred to the third impression cylinder 6A and without being inverted. The reversing cylinder 12 can be switched to the normal state to be transferred to the third impression cylinder 6A.
The reversing cylinder 12 is configured to have a smaller diameter than the other transfer cylinders 13 and 14, and is provided with a gripper for gripping the sheet P with a claw base and a claw at one place in the circumferential direction.

  As shown in FIG. 3, the first transfer cylinder 13 has a gripper 11 that holds the sheet P conveyed by the second impression cylinder 5 </ b> A with a nail base and a nail in the circumferential direction. To provide a large number (13 in FIG. 3) at predetermined intervals along the rotation axis direction in each of the two locations, and to blow air toward the transfer portion of the sheet P to the second transfer cylinder 14 The air supply means B is provided so that the sheet P delivered to the surface of the second transfer cylinder 14 can be pressed by the air from the air supply means B.

  The air supply means B includes a plurality of blower pipes 15 provided in the first transfer cylinder 13 in a state substantially parallel to the rotation axis X of the cylinder 13 and at predetermined intervals along the circumference. 2 (the number is 18 in FIG. 2), and a blower 16 for supplying air to the plurality of blower pipes 15 is provided.

As shown in FIG. 3, the blower pipe 15 is formed of a cylindrical pipe, and is laid between disk-shaped rotating members 17 and 18 that are positioned at both ends in the left-right width direction constituting the first transfer cylinder 13. .
More specifically, one end (left end) of the blower pipe 15 is embedded in one (left side) rotating member 17, and the open end of one end (left end) of the blower pipe 15 is closed, and the other end ( The right end is penetrated by the other (right side) rotating member 18.
A disc-shaped plate member 19 is fitted on the outer end (right end) of the other (right side) rotation member 18 so as not to rotate on the rotation shaft 13A of the first transfer cylinder 13. An arc-shaped air supply groove 19M is formed over a predetermined area on the circumference.

  The air supply groove 19M functions as a groove for supplying air from the blower 16 to the blower pipe 15 in communication with the blower pipe 15 as the first transfer cylinder 13 rotates. Yes. A disc-shaped closing member 20 for closing the right end of the plate member 19 in which the air supply groove 19M is formed is provided, and air from the blower 16 is supplied to the closing member 20 to the air supply groove 19M. A through hole 20K is formed. The through hole 20K includes a vertical hole communicating with the air guiding hose 21 connected to an opening formed at the lower end of the closing member 20, and a horizontal hole communicating with the air supply groove 19M from the vertical hole. .

Accordingly, air is ejected radially from the nine blower pipes 15 located between the delivery part that receives the sheet P from the impression cylinder 5A and the delivery part of the sheet P to the second delivery cylinder 14. Be able to. That is, as shown in FIGS. 2A, 2B, and 2C, the sheet P received until the sheet P received from the impression cylinder 5A is transferred to the second transfer cylinder 14 is obtained. The blow can be blown from a direction substantially perpendicular to the surface of the film.
In particular, at the position shown in FIG. 2A, that is, at the transfer section that transfers to the second transfer cylinder 14, blow is blown from the direction substantially perpendicular to the surface of the sheet P to the second transfer cylinder 14. The sheets P can be wound while being in close contact with each other from the winding start position. The blower pipe 15 is formed with a large number of air ejection holes at a predetermined interval in a line in the longitudinal direction of the pipe, but the air ejection holes are formed in two or more rows or randomly arranged in an unaligned manner. However, it is particularly preferable that the direction of the air from the air ejection hole is substantially perpendicular to the surface of the sheet.

  Two paper guides 22 and 22 are disposed below the first transfer cylinder 13 along the conveying direction, and air from the blower pipe 15 is supplied to the impression cylinder 5A at a place other than the transfer section. The sheet P is pressed against the paper guides 22 and 22 by spraying on the sheet P being received and conveyed from the sheet, and the contact generated between the paper guides 22 and 22 and the sheet P is thereby caused. The resistor can be delivered while being in close contact with the second delivery cylinder 14. In addition, by blowing air from the blower pipe 15 at the transfer portion, that is, at the winding start position of the sheet P as described above, the sheet P is prevented from being lifted particularly at the winding start position of the sheet P. Therefore, the sheet P can be wound while being more closely attached to the surface of the second transfer cylinder 14.

  The paper guide 22 is provided with suction means 23 for sucking the sheet to be conveyed, and by applying a large tension to the sheet P, the sheet P is transferred to the surface of the second transfer cylinder 14. Thus, it is possible to wind the wire while making it more securely contacted.

As shown in FIGS. 2 and 4, the suction means 23 includes a plurality of suction holes 22A formed on the surface of the paper guide 22 formed in a box shape on the first transfer cylinder 13 side, and air from the suction holes 22A. And a suction device 24 for sucking.
Out of the opening area per unit area by the suction hole 22A, the opening area on the downstream side in the conveyance direction of the sheet P is increased more than the opening area on the upstream side in the conveyance direction, whereby the downstream side in the conveyance direction of the sheet P The suction force in the region is made stronger than the upstream region in the transport direction so that the degree of adhesion of the sheet P to the surface of the second transfer cylinder 14 can be increased. In FIG. 4, the distance between the suction holes 22 </ b> A in the transport direction is configured to become smaller toward the downstream side in the transport direction of the sheet P, so that the suction force increases toward the downstream side in the transport direction of the sheet P. ing.

  The second transfer cylinder 14 has grippers 11 for gripping the sheet P conveyed by the first transfer cylinder 13 between the claw base and the claw in two circumferential directions in the direction of the rotation axis. A number of paper adsorbing devices 25 for sucking the paper bottom of the sheet P gripped by the gripper 11 are provided at two locations in the circumferential direction, respectively. The sheet P is wound around the two transfer cylinders 14 while being in close contact with each other, and when the paper bottom of the sheet P comes into close contact with the second transfer cylinder 14, the sheet is adsorbed by the paper adsorbing device 25. ing.

In FIG. 6, the guide surface 22A at the downstream end in the transport direction of the paper guide 22 located on the downstream side in the transport direction among the paper guides 22, 22, 22 shown in FIG. It is formed along the direction of the tangent S in the 14 sheet delivery section H.
By forming in this way, the tension force on the sheet P in the state of being sucked by the paper guide 22 may be further increased. That is, by pulling the sheet P in a direction substantially orthogonal to the guide surface 22A of the paper guide 22, the sheet P is pulled compared to the case where the sheet P is pulled in a direction intersecting the guide surface 22A. The force does not act in the direction of peeling P, the tension force by suction is efficiently applied to the sheet P, and the sheet P can be delivered smoothly.

  Although the sheet delivery apparatus A according to the present invention has been described with the reversing cylinder 12, as shown in FIGS. 5A, 5B, and 5C, the structure without the reversing cylinder 12 that can perform only single-sided printing. It may be. 5 is the same as FIG. 2 except that the paper guides 22, 22, and 22 are configured, and the same reference numerals are given.

Further, as shown in FIGS. 6 and 7, a sheet delivery device A that is transported to the surface treatment device 26 may be configured. This surface treatment device 26 is a resin varnish coating device 27 disposed in the preceding process, and applies a resin varnish to the printed surface to give it gloss, and then feeds out the film F from there to give a gold foil, embossed pattern or hologram pattern. The printing surface can be processed by transferring the like.
The impression cylinder 28 when pressing the film F against the sheet corresponds to the second transfer cylinder 14, and the cylinder 29 on the upper side in the transport direction passing to the impression cylinder 28 corresponds to the first transfer cylinder 13. Three paper guides 22, 22, 22 are provided below 29. FIG. 6 shows a printing machine including five color printing units 30, 31, 32, 33, and 34.

  Further, the printing machine is not limited to a single-sided printing machine or a double-sided printing machine, but may be a printing machine such as a gravure or a flexo in addition to an offset printing machine.

  In addition, the air blowing range is set so that the air from the blower pipe 15 can be blown up to the range where the sheet P is pressed against the paper guide 22 as well as the winding start position of the sheet P. The structure which blows the air from the blower pipe 15 only to the winding start position of the leaf paper P may be sufficient. Although the blower pipe 15 is used here, other various configurations may be used as long as air can be blown.

1 is an overall side view of a printing press. (A), (b), (c) is a side view which shows operation | movement of a sheet delivery apparatus. It is sectional drawing of a 1st transfer drum. It is a bottom view of a paper guide. (A), (b), (c) is a side view which shows operation | movement of the sheet delivery apparatus which abbreviate | omitted the inversion cylinder. It is a side view which shows the sheet delivery apparatus incorporating the paper guide from which a shape differs. It is a whole side view which shows another printing machine. It is a side view of the principal part in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Paper feed part, 2 ... Printing part, 3 ... Paper discharge part, 4, 5, 6, 7 ... Printing unit, 4A-7A ... Impression cylinder, 4B-7B ... Plate cylinder, 4C-7C ... Rubber cylinder, 8 9, 10 ... barrel, 11 ... gripper, 12 ... reversing barrel, 13, 14 ... barrel, 15 ... blower pipe, 16 ... blower, 17, 18 ... rotating member, 19 ... plate member, 19M ... air supply groove, 20 ... members, 21 ... air guide hose, 22 ... paper guide, 22A ... hole, 23 ... suction means, 24 ... suction device, 25 ... paper adsorption device, 26 ... surface treatment device, 27 ... resin varnish application device, 28 ... Impression cylinder, 29 ... cylinder, 30, 31, 32, 33, 34 ... printing unit, A ... sheet delivery device, B ... air supply means, F ... film, P ... sheet, X ... rotational axis

Claims (5)

A sheet of paper that is provided with a plurality of transfer cylinders along the transfer direction and that is provided with grippers for gripping the fed sheet with the nail base and the nail, and is conveyed by the transfer cylinder upstream in the transfer direction. A sheet delivery device in a printing press that forms an image by applying colored ink to the sheet with a roller.
The paper guide includes a suction unit for sucking a sheet transported by a cylinder on the upstream side in the transport direction, and is provided on the downstream side in the transport direction by a suction resistance by which the sheet is sucked by the suction unit. A sheet delivery device in a printing machine, wherein tension is applied to the sheet wound around a cylinder.   A blower pipe for blowing air blow on the sheet conveyed by the upstream cylinder in the conveying direction is provided inside the cylinder, and the sheet is applied to the paper guide by blowing air blow from the blower pipe. 2. The sheet delivery device in a printing machine according to claim 1, wherein the sheet delivery device is pressed.   The suction means includes a plurality of suction holes formed in the paper guide and a vacuum device for sucking air from the suction holes. Of the opening area per unit area by the suction holes, the sheet 3. The sheet delivery apparatus for a printing press according to claim 1, wherein the opening area on the downstream side in the transport direction is made larger than the opening area on the upstream side in the transport direction.   The guide surface of the downstream end portion in the transport direction of the paper guide is formed so as to be along the tangential direction in the sheet delivery portion of the cylinder on the downstream side in the transport direction. The sheet delivery apparatus in the printing machine as described in 2.   The sheet delivery apparatus in a printing machine according to any one of claims 1 to 4, further comprising a reversing mechanism capable of performing duplex printing by reversing the printing surface of the sheet.

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