JP2001225987A - Paper conveyance device for printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the disadvantages of a conventional paper conveyance device for a printing machine that a printed face comes into contact with a feeder board and is rubbed in a corner part of an air vent and printing ink is deposited, making the printed face dirty, because many holes are provided in a conveyance belt and the feeder board to suck and convey printing paper in the conventional paper conveyance device, but the printing paper adheres closely to the feeder board when the conventional paper conveyance device is used as it is an it is unavoidable that pressure in the vicinity of the convey ance belt becomes slightly negative pressure, although a device that many air vents are provided in the vicinity of the conveyance belt to prevent an increase of a degree of vacuum is taken. SOLUTION: A ventilation groove is provided from an end to the other end along the direction of flow of printing paper on the feeder board in the vicinity of the conveyance belt, and air vents are provided on a bottom of the ventilation groove to eliminate rubbing of the printed face and prevent the deposit of printing ink so that the printed face does not become dirty.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper transport device for a sheet-fed printing press, and more particularly to a feeder board of a paper feed table for transporting printing paper.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open No.
As disclosed in JP-A-23950, there is an apparatus in which a plurality of holes are formed in a conveying belt and a feeder board, and a printing paper is sucked through the holes to surely convey the sheet.

However, in the conventional apparatus configured as described above, when a surface that has already been printed for double-sided printing passes through the feeder board, the printing surface is rubbed by a suction force, and printing ink is peeled off. In some cases, the printed air was contaminated on the vent hole opened above or adhered to another surface to stain the printed surface.

This will be described with reference to FIG. 3 when the sheet feeding device is viewed from the side, FIG. 4 when the sheet feeding table is viewed from above, and FIG. 5 which shows a cross section taken along line BB of FIG. 2 piles 5
The printing paper 13 taken out of the printer and fed onto the paper feeding table 18 is transported on the feeder board 3 by an endless transport belt 6 driven by a drive shaft 8, and is moved by a front contact 9 in a vertical direction, a horizontal needle device 14. And is supplied to the printing apparatus 1.

When the printing paper 13 moves on the feeder board 3, a suction box 4 connected to a suction source is provided below the feeder board 3 so that the printing paper 13 can be transported reliably. 11 (conveying belt) and 10 (feeder board) are opened so that the printing paper 13 can be conveyed by suction.

However, when the printing paper 13 is sucked in this way,
External air is sucked from a gap between the feeder board 3 and the transport belt 6 or a gap between the printing paper 13 and the transport belt 6, and the air between the feeder board 3 and the transported printing paper 13 is diluted. The printing paper 13 comes into close contact with the feeder board 3, and the conveyance resistance of the printing paper 13 increases, which may disturb the conveyance shape.

In order to prevent this, a number of vents 12 are provided in the vicinity of the transport belt 6 of the feeder board 3 so that the degree of vacuum other than the transport belt 6 does not increase.
However, it is inevitable that the pressure around the conveyance belt is negative, though it is very small, so that the printing paper 13 is conveyed while in contact with the feeder board.

However, the printed paper 13 to be conveyed may have one side already printed. In this case, the printed surface comes into contact with the feeder board 3 and is further rubbed by the corners 15 of the above-described vent hole 12, and In some cases, printing ink was deposited on the print No. 12 to stain the printed surface. In such a case, it is necessary to clean the corners 15 of the vents 12, but since the number is large, cleaning is troublesome, the workability is poor, and the productivity is reduced.

[0009]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention does not rub off the printing ink even if the printing surface is on the feeder board side, so that the printed surface is not stained or cleaned. It is an object to provide a paper transport device for a printing press that does not need to do this.

[0010]

According to the present invention, there is provided an endless conveying belt for arranging a large number of holes to adsorb and convey a printing paper. A feeder table comprising a feeder board provided with a plurality of suction holes provided at a lower portion of the feeder belt, and a feeder for a printing press for feeding printing paper from a paper pile side to a printing apparatus; In the vicinity of the transport belt on the board, one or a plurality of ventilation grooves having the print paper side open from end to end of the feeder board along the flow direction of the print paper are provided, and the air pressure is applied to portions other than the transport belt portion. The printing surface is not rubbed by the ventilation groove.

Since the ventilation groove is provided from one end of the feeder board to the other as described above, there is no one corresponding to the corner of the ventilation hole as in the prior art. Never scrape. In addition, corner 1 of ventilation groove
7 is a portion which is sufficiently open to the atmosphere, so that the printing paper does not come into strong contact. Therefore, the printing ink does not accumulate and stain the already printed surface, and the printing quality is improved. Further, even if the corners are stained with printing ink, the ventilation grooves are continuous in the longitudinal direction, and are easy to clean, so that the workability is improved and the productivity is improved.

According to a second aspect of the present invention,
At several locations at the bottom of the ventilation groove, vent holes open to the atmosphere are provided,
It is characterized in that the printing surface is not rubbed by the ventilation groove so that the entire ventilation groove has an atmospheric pressure on average.

In this manner, the ventilation port 12 has no opening at the place where it comes into contact with the printing paper on the feeder board 3, and does not scrape the printing ink. Vent 1
Due to the presence of 2, the entire ventilation groove 16 is uniformly at atmospheric pressure, preventing the printing paper from rubbing with the feeder board 3 and preventing the already printed surface from being stained, thereby improving the printing quality.

According to a third aspect of the present invention,
The upper corner of the ventilation groove is rounded so that the printed surface is not rubbed by the ventilation groove.

By rounding the corners of the ventilation groove in this manner, even if the printing surface comes into contact with the feeder board, the printing ink is not scraped off, so that the printed surface is prevented from being stained. Quality is improved.

[0016]

Embodiments of the present invention will be illustratively described in detail below with reference to the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples. It's just

FIG. 1 is a top view of a sheet feeding table of the sheet feeding apparatus of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA of FIG. did.

In the figure, 3 is a feeder board having holes 10, 4 is a suction box, 6 is a conveyor belt having holes 11, 7 is a roller around which the conveyor belt 6 is wound, 8 is a drive shaft of the conveyor belt 6, 9 is a forehead, 14 is a horizontal needle, 16 is a ventilation groove,
Reference numeral 17 denotes a corner of the upper surface of the ventilation groove 16.

Among these, the ventilation groove 16 is formed by the conventional ventilation port 12.
This is provided with a longitudinal groove penetrating to the end of the feeder board 3 near both sides of the conveyor belt 6 on the feeder board 3 as shown in FIG. An opening 12 is provided so that suction can be performed by the suction box 4, and the upper surface corner 17 of the ventilation groove 16 is rounded.

The ventilation groove 16 may be formed as a single groove on both sides of the conveyor belt 6 as shown in FIG.
As shown in FIG. 2B, two or more lines may be provided.

The printing paper 13 taken out of the pile 5 of the paper feeding device 2 and supplied onto the paper feeding table 18 is
Is transported on the feeder board 3 by an endless transport belt 6 driven by the
At 4, the sheet is positioned in the width direction and supplied to the printing apparatus 1.

When the printing paper 13 is transported on the feeder board 3, the printing paper 13 is sucked to the transport belt 6 by suction from the suction box 4 through the holes 10 on the feeder board 3 and the holes 11 on the transport belt 6. . However, the ventilation groove 16
Penetrates along the flow direction of the printing paper 13 to the end of the feeder board 3 and has the ventilation port 12 at the bottom of the groove. Therefore, the printing paper 13 is not strongly rubbed against the feeder board 3.

Further, the vent 12 of the vent groove 16 does not have the corner 15 existing on the feeder board 3 as in the conventional apparatus, and the upper corner 17 is rounded. There is no portion for scraping the printing ink even when rubbed against the surface, and it is possible to prevent the occurrence of printing stains.

[0024]

As described above, according to the first aspect of the present invention, since the ventilation groove is provided from one end of the feeder board to the other, there is no longer a corner corresponding to the conventional ventilation opening, Even if the already printed surface is conveyed, the ink on the printed surface is not scraped. Further, since the corner 17 of the ventilation groove is a part which is sufficiently opened to the atmosphere, the printing paper does not come into strong contact. Therefore, the printed surface is not stained, and the print quality is improved. Also, even if the corners become dirty, the ventilation grooves are continuous in the longitudinal direction and are easy to clean, so that the workability is improved and the productivity is improved.

According to the second aspect of the present invention, there is no opening in the ventilation port 12 where it comes into contact with the printing paper on the feeder board 3, and the printing ink is not scraped off. In addition, the presence of the ventilation holes 12 makes the entire ventilation groove 16 evenly atmospheric pressure, thereby preventing the printing paper from rubbing against the feeder board and preventing the printed surface from being stained, thereby improving the printing quality.

According to the third aspect of the present invention, the corners of the ventilation grooves are rounded so that the printing ink is not scraped off even if the printing surface comes into contact with the feeder board, and therefore the already printed surface is stained. And print quality is improved.

[Brief description of the drawings]

FIG. 1 is a top view showing a configuration of a main part according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along a line AA in FIG.

FIG. 3 is a schematic side view of a conventional sheet feeding device.

FIG. 4 is a schematic top view of a paper feed table of a conventional paper feed device.

FIG. 5 is a sectional view taken along the line BB in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printing apparatus 2 Paper feeder 3 Feeder board 4 Suction box 5 Pile 6 Suction conveyance belt 7 Roller 8 Drive shaft 9 Forehead 10 Hole 11 Hole 12 Vent hole 13 Printing paper 14 Horizontal needle device 15 Vent corner 16 Vent groove 17 Vent Groove corner 18 Feeding table 19 Printing ink

Claims (3)

[Claims] 1. A paper feed table comprising an endless transport belt for arranging a number of holes to adsorb and transport printing paper, and a feeder board provided below the transport belt and having a plurality of suction holes. A paper transport device for a printing press that transports printing paper from a paper pile side to a printing device having a printing paper near the transport belt on the feeder board, from the end of the feeder board along the printing paper flow direction. A paper transport device for a printing press, wherein one or a plurality of ventilation grooves having open sides are provided, and the printing surface is prevented from being rubbed by the ventilation grooves by setting the pressure other than the transport belt at atmospheric pressure. 2. A ventilation port which is open to the atmosphere at a plurality of locations at the bottom of the ventilation groove, so that the entire ventilation groove has an atmospheric pressure on average so that the printing surface is not rubbed by the ventilation groove. The paper transport device for a printing press according to claim 1. 3. The ventilation groove has a rounded upper corner to prevent the printed surface from being rubbed by the ventilation groove.
A paper transport device for a printing press according to claim 2.