JP6090903B2 - Rotary screen printing machine - Google Patents

Description

  The present invention relates to a rotary screen printer.

  As a rotary screen printing machine that performs screen printing on a sheet, for example, the one described in Patent Document 1 below is known. In the rotary screen printing machine described in Patent Document 1 or the like, two rotary screen cylinders are brought into contact with one impression cylinder, and two types of screen printing can be performed on the sheet. ing.

Japanese Patent No. 4260885 JP 2002-011847 A

  In the rotary screen printing machine described in Patent Document 1 and the like as described above, if the ink printed on the sheet by the first rotary screen cylinder comes into contact with the next rotary screen cylinder, the ink is pressed. The area to be printed on the sheet by the first rotary screen cylinder and the area to be printed on the sheet by the next rotary screen cylinder must not overlap with each other because rubbing will result in poor printing. Each of the rotary screen cylinders has limited the areas that can be printed on the sheet.

  In view of the above, an object of the present invention is to provide a rotary screen printing machine that can perform screen printing on a sheet without any problem even if areas to be printed on the sheet overlap by a plurality of rotary screen cylinders.

In order to solve the above-described problems, a rotary screen printing machine according to the present invention includes a sheet feeding unit that feeds a sheet, and a first sheet that receives, holds, and transports the sheet from the sheet feeding unit . An impression cylinder, and a first rotary screen cylinder that screen-prints the sheet held on the first impression cylinder in contact with a side of the first impression cylinder on the side of the sheet feeding unit. A first screen printing unit, and a first screen printing unit disposed downstream of the first screen printing unit in the sheet conveying direction, wherein the sheet from the first impression cylinder of the first screen printing unit is disposed above Screen printing on the second impression cylinder to be received, held and conveyed, and the sheet held on the second impression cylinder in contact with the side of the second impression cylinder on the side of the paper feed unit Apply A second screen printing unit having two rotary screen cylinders; and the second screen printing unit disposed on the upstream side in the sheet conveyance direction of the second screen printing unit and printed by the first screen printing unit. And a first drying means for drying the printed surface.

  The rotary screen printing machine according to the present invention is the rotary screen printing machine described above, wherein the first drying means is disposed so as to face the first impression cylinder of the first screen printing unit. It is characterized by.

  The rotary screen printing machine according to the present invention is the rotary screen printing machine described above, wherein the rotary screen printing machine is disposed between the first screen printing unit and the second screen printing unit. A reversing unit is provided that holds and conveys the sheet so that one side and the other side of the sheet from the unit are reversed and delivered to the second screen printing unit.

The rotary screen printing machine according to the present invention is the rotary screen printing machine described above, wherein the first rotary screen cylinder of the first screen printing unit and the second rotary screen of the second screen printing unit. The cylinder has a cylindrical plate having a small hole corresponding to the pattern, and the screen printing liquid that is disposed inside the plate and accumulates at the top as the plate rotates is provided at the tip. And a squeegee which is pushed out from the small hole of the printing plate and supplied to the impression cylinder side .
Further, the rotary screen printing machine according to the present invention is the rotary screen printing machine described above, wherein the first screen cylinder of the first screen printing unit rotates more than the contact position with the first rotary screen cylinder. A cylinder that receives the sheet from the first impression cylinder in contact with the downstream side in the direction is disposed at a position that contacts the first impression cylinder on the side rotating from the lower side toward the upper side, Receiving the sheet from the second impression cylinder by contacting the second impression cylinder of the second screen printing unit to the downstream side in the rotational direction from the contact position of the second impression cylinder with the second rotary screen cylinder. The cylinder to be performed is disposed at a position in contact with the second impression cylinder on the side rotating from the lower side toward the upper side.
The rotary screen printing machine according to the present invention is the above-described rotary screen printing machine, wherein the cylinder and the second screen receive the sheet from the first impression cylinder of the first screen printing unit. The cylinder that receives the sheet from the second impression cylinder of the printing unit is configured to hold and convey the sheet.

  According to the rotary screen printing machine of the present invention, after the sheet screen-printed by the first rotary screen cylinder of the first screen printing unit is dried by the first drying means, the second screen printing unit Since screen printing can be performed with the second rotary screen cylinder, the liquid for screen printing printed on the sheet with the first rotary screen cylinder of the first screen printing unit is transferred to the second rotary screen cylinder of the second screen printing unit. It is possible to remarkably suppress the occurrence of printing defects even if pressed, rubbed, and screen printed on a sheet by the first rotary screen cylinder of the first screen printing unit. Second rotary of area and second screen printing unit Since there is no cause restrictions between the regions screen printing on the sheet by the clean cylinder, even overlap the area, it can be subjected to screen printing without problems on the sheet.

1 is a schematic configuration diagram of a main embodiment of a rotary screen printing machine according to the present invention. It is a schematic block diagram of the principal part of the 1st screen printing unit of the rotary screen printer of FIG. It is a schematic block diagram of the principal part of the 2nd screen printing unit of the rotary screen printer of FIG.

  Embodiments of a rotary screen printing machine according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments described with reference to the drawings.

[Main embodiments]
A main embodiment of a rotary screen printing machine according to the present invention will be described with reference to FIGS.

  As shown in FIG. 1, a transfer cylinder 120a is disposed on the front end side of a feeder board 112 of a sheet feeding device 110 that is a sheet feeding unit that feeds sheets 1 on a sheet feeding table 111 one by one. The transfer cylinder 120a can receive the sheets 1 from the feeder board 112 one by one via the swing device 113. The transfer cylinder 120a is in contact with the transfer cylinder 120a. The transfer cylinder 120b is in contact with the transfer cylinder 120b. The transfer cylinder 120d is in contact with the transfer cylinder 120c.

  A pressure drum (first pressure drum) 121 of the first screen printing unit 120 is in contact with the lower side of the transfer drum 120d. In other words, the transfer cylinder 120 d is in contact with the impression cylinder 121 so as to be positioned above the impression cylinder 121. A rotary screen cylinder (first rotary screen cylinder) 122 is in contact with a side of the impression cylinder 121 on the downstream side in the rotational direction from the position of contact with the transfer cylinder 120d. Is set so that its axial position is substantially the same height as the axial position of the impression cylinder 121.

  As shown in FIG. 2, the rotary screen cylinder 122 is replaced by the holding device (sheet holding device) 121b of the impression cylinder 121 from the transfer cylinder 120d, and the outer side of the sheet 1 conveyed on the impression cylinder 121. The screen can be screen printed.

  The rotary screen cylinder 122 is wound with a screen 122a, which is a cylindrical plate material in which small holes are etched according to a pattern, and both ends are supported by a frame so that the screen 122a can move in the radial direction. A squeegee shaft 122b for supplying squeegee or varnish (liquid for screen printing), and a squeegee 122c for extruding the ink or varnish supplied from the squeegee shaft 122b through a small hole of the screen 122a and supplying the squeegee shaft 122b to the impression cylinder 121 side The squeegee portion is constituted by the squeegee 122c and the squeegee shaft 122b, and the angle (squeegee installation angle) θ between the horizontal plane H passing through the tip of the squeegee 122c and the squeegee 122c is 0 °. The squeegee portion is set so as to satisfy the above (θ ≧ 0 °).

  A gap guard 121c having a guide surface 121ca having substantially the same curvature as the outer peripheral surface of the impression cylinder 121 is provided between one end and the other end of the notch 121a of the impression cylinder 121. The outer periphery of the impression cylinder 121 is arranged so as to cover the notch 121a.

  The holding device 121b is disposed in the notch 121a of the pressure drum 121, and the claw 121bb can be opened and closed by the rotation of the claw shaft 121ba to hold and release the sheet. ing. On the outer surface of the claw 121bb, there is a guide surface 121bba having substantially the same curvature as the outer peripheral surface of the impression cylinder 121 so as to be continuous with the outer peripheral surface of the impression cylinder 121 at one end portion of the notch 121a. Thus, the rotary screen cylinder 122 can be prevented from falling into the notch 121a or dented by the claw 121bb, and the life of the screen 122a can be extended. ing.

  As shown in FIG. 1, the suction cylinder 131 of the reversing unit 130 is located on the downstream side in the rotational direction of the pressure cylinder 121 of the first screen printing unit 120 from the position of contact with the rotary screen cylinder 122. It touches. A reversing cylinder 132 is in contact with the suction cylinder 131 on the downstream side in the rotational direction from the position of contact with the pressure cylinder 121. A transfer drum 140a is in contact with the reversing drum 132 on the downstream side in the rotational direction from the position of contact with the suction drum 131.

  The reversing unit 130 conveys the sheet 1 transferred from the impression cylinder 121 of the first screen printing unit 120 while holding the one surface and the other surface without reversing the sheet 1. It is possible to select and switch between delivery to 140a and transfer to the transfer cylinder 140a by holding and transporting the one surface and the other surface so as to be reversed. (For the specific structure, see, for example, Patent Document 2).

  Between the contact position of the pressure drum 121 with respect to the rotary screen cylinder 122 and the downstream side of the rotation direction with respect to the position of contact with the suction cylinder 131, the rotary screen cylinder 122 A first dryer 151, which is a first drying means for drying ink, varnish, etc. (screen printing liquid) on the printing surface screen-printed on the sheet 1, is disposed so as to face the impression cylinder 121. Yes.

  A pressure drum (second pressure drum) 141 of the second screen printing unit 140 is in contact with the transfer drum 140a on the downstream side in the rotation direction from the contact position with the reversing drum 132. In other words, the transfer drum 140a is in contact with the pressure drum 141 so as to be positioned above the pressure drum 141. A rotary screen cylinder (second rotary screen cylinder) 142 is in contact with a side of the pressure cylinder 141 on the downstream side in the rotational direction from the position of contact with the transfer cylinder 140a. Is set so that its axial position is substantially the same height as the axial position of the impression cylinder 141.

  As shown in FIG. 3, the second screen printing unit 140 is configured in the same manner as the first screen printing unit 120. Specifically, similar to the rotary screen cylinder 122, the rotary screen cylinder 142 is replaced by a holding device (sheet holding device) 141b of the impression cylinder 141 from the transfer cylinder 140a, and the upper surface of the impression cylinder 141 is changed. Screen printing can be performed on the outer surface of the conveyed sheet 1.

  The rotary screen cylinder 142 includes a screen 142a, a squeegee shaft 142b, and a squeegee 142c, similar to the rotary screen cylinder 122, and the squeegee 142c and the squeegee shaft 142b constitute a squeegee portion. The squeegee portion is set so that an angle (squeegee installation angle) θ between the horizontal plane H passing through the tip of the squeegee 142c and the squeegee 142c is 0 ° or more (θ ≧ 0 °).

  Further, in the impression cylinder 141, like the impression cylinder 121, a gap guard 141c having a guide surface 141ca is disposed in the notch portion 141a.

  The holding device 141b is disposed in the notch portion 141a of the impression cylinder 141 similarly to the holding device 121b, and the claw 141bb is opened and closed by the rotation of the claw shaft 141ba to hold and release the sheet. In addition, the guide surface 141bba is formed on the outer surface of the claw 141bb to prevent the rotary screen body 142 from falling into the notch 141a or being dented by the claw 141bb. Thus, the life of the screen 142a can be extended.

  As shown in FIG. 1, a discharge device 160, which is a discharge unit, is located downstream of the contact position of the pressure drum 141 of the second screen printing unit 140 with the rotary screen drum 142 in the rotation direction. The sheet discharge drum 161 is in contact. The paper discharge drum 161 is provided with a sprocket (not shown) coaxially. An endless paper discharge chain 162 provided with a plurality of hooks is wound around the sprocket. Below the paper discharge chain 162, a plurality of (three in this embodiment) paper discharge trays 163A to 163C are arranged along the traveling direction of the paper discharge chain 162.

  Above the paper discharge chain 162, a sheet guide 164 is provided that conveys and guides the sheet 1 added to the claw hook of the paper discharge chain 162 without fluttering. Below the sheet guide 164, the second drying for drying ink, varnish, etc. (liquid for screen printing) on the printing surface screen-printed on the sheet 1 by the rotary screen cylinder 142 of the second screen printing unit 140. A second dryer 152 as a means is arranged so that the paper discharge chain 162 is interposed therebetween.

  In addition, the pressure drum 141 of the second screen printing unit 140 is downstream in the rotational direction from the contact position with the rotary screen drum 142 and the upstream in the rotation direction from the contact position of the paper discharge drum 161. An inspection camera 171 that inspects the printing state of the outer surface of the sheet 1 that is held and conveyed by the impression cylinder 141 is disposed between the inspection camera 171 and the sheet.

  Next, the operation of the rotary screen printer 100 according to this embodiment will be described.

  For example, when two types of screen printing are performed on only one surface of the sheet 1, first, the one surface and the other surface of the sheet 1 from the impression cylinder 121 of the first screen printing unit 120 are reversed. The reversing unit 130 is set so as to be transferred to the transfer drum 140a without any change.

  When the sheets 1 on the sheet feeding table 111 are fed one by one from the sheet feeding device 110, the sheets 1 are delivered from the feeder board 112 to the transfer cylinder 120a by the swing device 113. One surface of the rotary screen cylinder 122 is transferred to the impression cylinder 121 of the first screen printing unit 120 through the transfer cylinders 120b to 120d and is held and conveyed with the one surface facing outward. Ink, varnish, etc. (liquid for screen printing) are screen-printed and then dried by the first dryer 151, and then the suction cylinder 131, the reversing cylinder 132 and the transfer cylinder 140a of the reversing unit 130 are used. And is held by the impression cylinder 141 of the second screen printing unit 140 with one surface facing outward. While it is transported.

  The sheet 1 held on the pressure cylinder 141 with one side facing outward is further screen-printed with ink, varnish, or the like (screen printing liquid) on the one side by the rotary screen cylinder 142. At this time, ink, varnish, or the like (screen printing liquid) previously screen-printed on one surface of the sheet 1 by the rotary screen cylinder 122 of the first screen printing unit 120 is transferred to the first dryer. Since it is already dried at 151, even if the rotary screen cylinder 142 comes into contact and is pressed or rubbed, there is no printing failure.

  The sheet 1 that has been further screen-printed on one side by the second screen printing unit 140 is inspected by the inspection camera 171, and then the discharge drum 161 of the paper discharge device 160 is removed. The second screen 152 is rotated by the second drier 152 while the sheet guide 164 suppresses the fluttering while being held by the claw hooks of the paper discharge chain 162. Ink, varnish, and the like (screen printing liquid) further screen-printed on one surface are dried by the cylinder 142.

  The sheet 1 dried with all screen-printed ink, varnish, etc. (screen printing liquid) is discharged when the printing state is normal based on the inspection result of the inspection camera 171. On the other hand, when the printing state is poor, the sheets are discharged and stacked on the discharge table 163C.

  On the other hand, for example, when screen printing is performed on one side and the other side of the sheet 1, the one side and the other side of the sheet 1 from the impression cylinder 121 of the first screen printing unit 120 are reversed. The reversing unit 130 is set so as to be delivered to the transfer drum 140a.

  Then, when the sheets 1 on the sheet feeding table 111 are fed one by one from the sheet feeding device 110, the sheets 1 are fed from the feeder board 112 by the swing device 113 in the same manner as described above. After being transferred to the transfer cylinder 120a, it is transferred to the impression cylinder 121 of the first screen printing unit 120 through the transfer cylinders 120b to 120d and is held and conveyed with one surface facing outward. While the rotary screen cylinder 122 is screen-printed with ink, varnish, or the like (liquid for screen printing) on one side, the first dryer 151 is used to dry the suction cylinder 131 and the reversing unit 130. It is reversed by the reversing cylinder 132 (see, for example, the above-mentioned Patent Document 2 for specific operation), and the second cylinder via the transfer cylinder 140a. It is conveyed while being held to direct the other side outside the impression cylinder 141 of the screen printing unit 140.

  The sheet 1 held on the pressure drum 141 with the other surface facing outward is screen-printed with ink, varnish, or the like (screen printing liquid) on the other surface by the rotary screen drum 142. At this time, ink, varnish, or the like (screen printing liquid) that has been screen-printed on one surface of the sheet 1 by the rotary screen cylinder 122 of the first screen printing unit 120 is transferred to the first dryer 151. Since it has already been dried, even if the rotary screen cylinder 142 comes into contact with the sheet 1 and is pressed against or rubbed against the impression cylinder 141, there is no printing failure.

  The sheet 1 that has been further screen-printed on the other side in the second screen printing unit 140 in this way is inspected by the inspection camera 171 and then discharged as in the case described above. It is held and conveyed by the claw hook of the paper discharge chain 162 via the paper discharge drum 161 of the apparatus 160, and the second dryer 152 controls the second drier while suppressing fluttering by the sheet guide 164. Ink and varnish (screen printing liquid) screen-printed on the other surface is dried by the rotary screen cylinder 142 of the screen printing unit 140.

  The sheet 1 dried with all screen-printed ink, varnish, and the like (screen printing liquid) is printed in the same manner as described above based on the inspection result of the inspection camera 171. Is normal, the paper is discharged and stacked on the paper discharge trays 163A and 163B. On the other hand, when the printing state is poor, the paper is discharged and stacked on the paper discharge tray 163C.

  That is, in the rotary screen printing machine 100 according to the present embodiment, the sheet 1 on which ink, varnish, or the like (screen printing liquid) is screen-printed by the rotary screen cylinder 122 of the first screen printing unit 120 is used as the first screen. After drying with one dryer 151, ink, varnish, or the like (liquid for screen printing) is screen-printed with the rotary screen cylinder 142 of the second screen printing unit 140.

  For this reason, in the rotary screen printing machine 100 according to the present embodiment, the ink, varnish, or the like (screen printing liquid) printed on the sheet 1 by the rotary screen cylinder 122 of the first screen printing unit 120 is Even if the rotary screen cylinder 142 of the second screen printing unit 140 comes into contact with the rotary screen cylinder 142 and is pressed or rubbed, it is possible to remarkably suppress the occurrence of printing defects.

  Therefore, according to the rotary screen printing machine 100 according to the present embodiment, the area of the first screen printing unit 120 screen-printed on the sheet 1 by the rotary screen cylinder 122 and the rotary of the second screen printing unit 140. Since there is no restriction between the screen cylinder 142 and the area to be screen-printed on the sheet 1, even if the areas overlap, the sheet 1 can be screen-printed without any problem.

  For this reason, for example, as described in Patent Document 1 or the like, it is necessary to form a screen, which is a cylindrical plate material, of the rotary screen cylinder in an uneven shape or to form a squeegee in a comb shape. As a result, not only can the cost of the screen and squeegee be reduced, but also the deterioration of the screen and squeegee can be suppressed, and the squeegee's pressing force against the screen can be prevented from being lowered. Screen printing can be maintained.

  The rotary screen cylinders 122 and 142 of the first and second screen printing units 120 and 140 are disposed so as to be in contact with the sides of the impression cylinders 121 and 141, that is, the rotary screen cylinder. Since the impression cylinders 121 and 142 are not positioned below the 122 and 142, even if the screens 122 a and 142 a of the rotary screen cylinders 122 and 142 are broken for some reason during printing, the rotary screen cylinder 122, It is possible to minimize damage caused by ink, varnish, and the like (screen printing liquid) inside 142 to the impression cylinders 121, 141, etc., and to improve reliability.

  Further, since the reversing unit 130 is disposed between the first screen printing unit 120 and the second screen printing unit 140, screen printing is performed on one or both of one side and the other side of the sheet 1. Can be applied.

[Other Embodiments]
In the above-described embodiment, the first dryer 151 is disposed so as to face the impression cylinder 121 of the first screen printing unit 120, so that the first screen printing unit 120 is arranged. The rotary screen cylinder 122 is used to dry the ink, varnish, or the like (screen printing liquid) screen-printed on the sheet 1. However, as another embodiment, the reversing unit 130 is omitted, for example, When two transfer cylinders are provided instead of the suction cylinder 131 and the reversing cylinder 132, the first dryer 151 is disposed so as to face the transfer cylinder provided instead of the reversing cylinder 132. By doing so, the ink screen-printed on the sheet 1 by the rotary screen cylinder 122 of the first screen printing unit 120 It is also possible to drying varnish or the like (screen printing liquid).

  The rotary screen printing machine according to the present invention screen-prints on a sheet by the first rotary screen cylinder of the first screen printing unit and the second rotary screen cylinder of the second screen printing unit. There is no restriction between the areas, and even if the areas overlap, the sheet can be screen-printed without any problem, so that it can be used extremely beneficially in the printing industry.

DESCRIPTION OF SYMBOLS 1 Sheet | seat 100 Rotary screen printer 110 Paper feeder 111 Paper feeder 112 Feeder board 113 Swing apparatus 120 First screen printing unit 120a-120d Transfer cylinder 121 Impression cylinder (first)
122 Rotary screen cylinder (first)
130 Inversion unit 131 Adsorption cylinder 132 Inversion cylinder 140 Second screen printing unit 140a Transfer cylinder 141 Pressure cylinder (second)
142 Rotary screen cylinder (second)
151 First dryer 152 Second dryer 160 Paper discharge device 161 Paper discharge drum 162 Paper discharge chain 163A to 163C Paper discharge table 164 Sheet guide 171 Inspection camera

Claims (6)

A paper feeding unit for feeding sheets;
A first impression cylinder that receives, holds, and conveys the sheet from the sheet feeding unit, and a first pressure cylinder that is in contact with a side of the first impression cylinder on the side of the sheet feeding unit. A first screen printing unit having a first rotary screen cylinder for applying screen printing to the sheet held on the cylinder;
The second screen is disposed downstream of the first screen printing unit in the sheet conveyance direction , and receives and holds the sheet from the first impression cylinder of the first screen printing unit upward and conveys the second sheet. And a second rotary screen cylinder that screen-prints the sheet held on the second impression cylinder in contact with a side of the second impression cylinder on the side of the sheet feeding unit. A second screen printing unit having
A first drying unit disposed on the upstream side of the second screen printing unit in the sheet conveying direction and drying the printed surface of the sheet printed by the first screen printing unit. Rotary screen printing machine characterized by. The rotary screen printing machine according to claim 1.
The rotary screen printing machine, wherein the first drying means is disposed so as to face the first impression cylinder of the first screen printing unit. In the rotary screen printing machine according to claim 1 or 2,
The second screen printing unit is disposed between the first screen printing unit and the second screen printing unit, and reverses the one side and the other side of the sheet from the first screen printing unit. A rotary screen printing machine comprising a reversing unit that holds and conveys the sheet so as to be delivered to a screen printing unit. In the rotary screen printing machine according to any one of claims 1 to 3,
The first rotary screen cylinder of the first screen printing unit and the second rotary screen cylinder of the second screen printing unit;
Cylindrical plate material with small holes according to the pattern,
A squeegee that is disposed inside the printing plate and accumulates at the top as the printing plate rotates and pushes the liquid for screen printing from the small hole of the printing plate at the tip and supplies the liquid to the impression cylinder side;
Rotary screen printing machine, characterized in that it comprises. In the rotary screen printing machine according to any one of claims 1 to 4,
Receiving the sheet from the first impression cylinder in contact with the first impression cylinder of the first screen printing unit on the downstream side in the rotational direction from the contact position of the first impression cylinder with the first rotary screen cylinder. The cylinder to perform is disposed at a position where it contacts the first impression cylinder on the side rotating from the lower side toward the upper side,
Receiving the sheet from the second impression cylinder by contacting the second impression cylinder of the second screen printing unit to the downstream side in the rotational direction from the contact position of the second impression cylinder with the second rotary screen cylinder. The cylinder to be performed is disposed at a position in contact with the second impression cylinder on the side rotating from the lower side toward the upper side.
A rotary screen printing machine characterized by that. The rotary screen printing machine according to claim 5,
The cylinder for receiving the sheet from the first impression cylinder of the first screen printing unit and the cylinder for receiving the sheet from the second impression cylinder of the second screen printing unit; The sheet is held and conveyed
A rotary screen printing machine characterized by that.

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