JPH1034881A - Paperboard conveying apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To damp a resistance by collision and to smoothly feed a sheet by disposing conveying rollers of adjacent lateral shafts in a zigzag manner, and disposing many guide rollers slightly protruding at circumferential surfaces from a lower plate so that a distribution of a suction pressure near the rollers becomes substantially equivalent over entire surface of a lower paperboard. SOLUTION: A sheet S is conveyed by a frictional force in contact with a bottom surface of a conveying roller 14 of a clockwise rotation in a direction of an arrow. At this time, a hood becomes a vacuum pressure therein. The sheet S is sucked at an entire surface so that an upward suction pressure distribution becomes equivalent from gaps of circumferences of guide rollers 14, 20. Since bottom surfaces of the rollers 20 are disposed at an upper position from the bottom surfaces of the rollers 14, the sheet S is prevented from being moved in vertical zigzag manner without contact with a lower plate 11. When an end of the sheet S is brought into contact with the rollers 14, it is guided to the vicinity of the bottom surfaces by the rollers 20 of this side and the rollers 14 are disposed in a zigzag manner. Accordingly, the rollers 14 attached to one lateral shaft 13 are less and damp at the collisions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for transporting paperboard, especially corrugated cardboard sheets.

[0002]

2. Description of the Related Art In a conventional flexographic printing press, each unit for printing or the like is directly connected during operation. However, when a lot is changed, it is necessary to replace a printing plate of a printing unit or clean an ink roller. This space is configured to be movable in the sheet feeding direction so that the space can be formed between the units. However, in such a configuration, each time the units are separated and reconnected, there is a problem that a meshing state of the connecting portion changes and printing shift occurs, and various measures have been taken against such a problem.

In Japanese Patent Publication No. Hei 7-29713, there is provided a space in which sheets can be conveyed while being accurately aligned between units, and a space for performing a lot change operation is provided between the units. In brief, a technique is disclosed in which a transport roller is adjacent to a lateral axis in a series, and a lower portion of the transport roller protrudes from a lower plate lower surface having a plurality of holes to transport the transport roller. The sheet is arranged so as to leave a slight gap around the protrusion of the roller, and the sheet is vacuum-adsorbed and conveyed to the lower surface of the conveying roller by a suction device mounted above, thereby shortening the set-up time. Was.

[0004]

Problems to be Solved by the Invention Japanese Patent Publication No. Hei 7-2
No. 9713 discloses no problem as long as the rigidity of the sheet is very high.
As shown in (1), the sheet is bent against the vacuum pressure, and particularly in the case of a thin and soft sheet, it comes into contact with the lower plate so as to be almost stuck. Further, the leading end of the sheet collides with a position where the lower surface of the lower plate of the conveying roller protrusion is steeply inclined. Such a contact and a collision become resistance to the running of the sheet, and a shift occurs in the printing position between the units. If more colors are used, the number of connected units also increases, so that the traveling distance of the seat becomes longer and the shift width is added.
For this reason, it has the same problems as the mobile type,
Cosmetic printing required by the recent differentiation orientation has not been satisfactory in accuracy between colors.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention eliminates frictional resistance without contacting a sheet with a lower plate when the sheet is conveyed.
In addition, the end of the sheet is brought into contact with the bottom surface of the conveying roller as much as possible to reduce the resistance due to the collision, and to smoothly move the sheet so as to minimize the displacement between the units.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, a lower plate is disposed below a transport roller fitted to a group of a plurality of parallel horizontal axes so that the peripheral surface of the transport roller slightly projects. In a paperboard transport device that surrounds the upper side with a hood connected to a suction device and sucks and transports the transported paperboard with vacuum pressure formed in a gap between a hole formed in a lower plate and a transport roller, the transport rollers on the adjacent horizontal axis are staggered. A large number of guide rollers whose peripheral surfaces slightly protrude from the lower plate are arranged so that the suction pressure distribution near the transport rollers is substantially uniform over the entire lower paperboard. Preferably, the horizontal shaft group is such that a synchronization belt is wound around a drive pulley fitted on a drive shaft of a drive motor and a driven pulley fitted on the horizontal shaft, and further, a guide roller bottom surface is positioned higher than a transport roller bottom surface. It is.

[0007]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a main part side view schematically showing a flexographic printing press. In the printing unit 2, a plate cylinder 4 on which a printing plate is wound and an impression cylinder 6 disposed above the plate cylinder 4 with a sheet running surface therebetween. An ink roll 5 for spreading ink on the projections of the printing plate is provided below the plate cylinder. A paperboard conveying device 1 embodying the present invention is provided above a sheet running surface between units.
Is provided, and an appropriate space 3 is provided below. The plate cylinder 4 and the ink roll 5 are accessible from the front of the unit.

FIGS. 2 and 3 show the paperboard conveying device 1.
Shown in FIG. 2 is a plan view of the transport device as viewed from the arrow X in FIG. Horizontal beam 12 as the outer frame of this device
Is formed in a rectangular shape, and is fixed so as to include the impression cylinder 6 and connect the units. A lower plate 11 having a plurality of holes from which a conveying roller and a guide roller, which will be described later, protrude is attached to the lower surface of the beam. The lower plate 11 has a slight gap with respect to the impression cylinder.

A plurality of horizontal shafts 13 are rotatably arranged in the beam 12 in the direction in which the sheet S is conveyed, and one end of the beam 12 extends out of the beam 12 and a timing pulley 15 is attached thereto. A timing belt 16 is attached to the timing pulley.
Are engaged, and the plurality of horizontal axes are synchronously driven by a drive motor (not shown). Conveyance rollers 14 are attached to the horizontal axis 13 at appropriate intervals, and the conveyance rollers attached to the adjacent horizontal axis are arranged in a staggered manner. The lower portion of the transport roller 14 protrudes from the lower plate 11, and a slight gap is formed around the protruding portion with a hole of the lower plate. The bottom surface of the transport roller 14 coincides with the bottom surface of the impression cylinder 6 to form a running surface of the sheet, and can be adjusted in the vertical direction by the thickness of the sheet.

On the other hand, as shown in FIG. 2, a pair of guide rollers
Is rotatably disposed with its lower part slightly projecting from the lower plate 11. The bottom surface of the protrusion is positioned higher than the bottom surface of the transport roller so as not to hinder the running of the sheet, and a slight gap is formed around the protrusion with the hole of the lower plate. I have. The guide roller is made of a resin having a small inertia so as not to cause resistance when the running sheet comes into contact with the guide roller, and is not particularly provided with a drive unit. It may be provided.

Further, a hood 9 is provided above the beam 12.
Are connected, and a suction device 10 is attached to the upper portion thereof (see FIG. 1). By evacuating the hood, the sheet S can be sucked from a gap around the conveying roller 14 and the guide roller 20.

Next, the operation of this embodiment will be described.
In the activated conveying device, the sheet S contacts the bottom surface of the conveying roller 14 rotating in the clockwise direction as shown in FIG. 3 and is conveyed in the direction of the arrow by frictional force. At this time, the inside of the hood 9 becomes vacuum pressure by the operation of the suction device 10, and the sheet is sucked over the entire surface from the gap around the conveying roller and the guide roller so that the suction pressure distribution becomes substantially uniform. For this reason, the frictional force described above is sufficiently transmitted without being pressed by the transport roller and slipping. Here, since the bottom surface of the guide roller 20 is positioned higher than the bottom surface of the transport roller, if the sheet S has sufficient rigidity, there is no contact. Even if the guide roller is arranged to be deformed by a suction force from above, the guide roller is provided, so that the sheet does not contact the lower plate 11, and the sheet is prevented from meandering up and down.

At the moment when the leading edge of the sheet S abuts on the conveying roller 14, if the sheet has sufficient rigidity, there is almost no upward warpage and the inclination of the outer periphery of the conveying roller 14 is almost horizontal regardless of the guide roller 20. Contact near. Similarly to this state, even if the tip is warped due to the suction force from above, the guide roller is forcibly guided to the vicinity of the bottom surface by the front guide roller, and the collision at the time of contact is reduced. In addition, since the transport rollers are arranged in a staggered manner, the number of transport rollers attached to one horizontal shaft 13 is small, so that there are few places where the leading end of the sheet comes into contact, and the collision is alleviated.

Since the impression cylinder 6 is included in the hood 9 and the sheet S is sucked before and after the hood 9, it is not necessary to provide a separate feed roller in the printing unit 2, and a printing plate for printing only a part of the printing unit 2. Even if there is a part that is not pinched, it is transported firmly.

[0015]

As described above, according to the present invention, the conveying rollers are arranged in a zigzag pattern and a number of small-diameter guide rollers are provided in the vicinity thereof so that any paperboard does not contact the lower plate regardless of the rigidity. There is an effect that cosmetic printing with good accuracy between colors can be performed without any deviation between colors. In addition, even when units such as a die cutter and a slotter are connected, there is an effect that processing with high positional accuracy can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a flexographic printing press provided with a paperboard transport device embodying the present invention.

FIG. 2 is a plan view of the paperboard transport device as viewed from an arrow X in FIG.

FIG. 3 is an enlarged sectional side view of a main part of the paperboard conveying device of the present invention.

FIG. 4 is a cross-sectional side view showing a main part of a conventional paperboard conveying device.

[Explanation of symbols]

 S sheet 1 paperboard transport device 9 hood 10 suction device 11 lower plate 14 transport roller 20 guide roller

Claims (3)

[Claims] 1. A lower plate is arranged below a transport roller fitted to a group of a plurality of parallel horizontal axes so that a peripheral surface of the transport roller slightly projects, and a portion above the horizontal axis is used as a suction device. In a paperboard transport device that is surrounded by a connected hood and transports the transported paperboard by vacuum pressure formed in the gap between the hole formed in the lower plate and the transport roller, the transport rollers on the adjacent horizontal axis are arranged in a zigzag and transported A paperboard conveying device comprising a plurality of guide rollers whose peripheral surfaces slightly protrude from a lower plate so that a suction pressure distribution near a roller is substantially uniform over the entire lower paperboard. 2. The paperboard transport device according to claim 1, wherein the horizontal shaft group has a synchronization belt wound around a drive pulley fitted to a drive shaft of a drive motor and a driven pulley fitted to the horizontal shaft. . 3. The paperboard transport device according to claim 1, wherein the guide roller bottom surface is positioned higher than the transport roller bottom surface.