JP3592986B2 - Paper transport device for printing press - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a paper transport device of a sheet-fed printing press, and more particularly to a feeder board of a paper feed table that transports printing paper.
[0002]
[Prior art]
As shown in Japanese Patent Application Laid-Open No. Hei 4-223950, a paper transport device of a printing machine has a number of holes formed in a transport belt and a feeder board, and sucks a printing paper through the holes to reliably transport the paper. There is something.
[0003]
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 the suction force, the printing ink is peeled off, and the printing ink is removed on the feeder board. In some cases, the accumulated air may accumulate on the vent or adhere to another surface to stain the printed surface.
[0004]
This will be described with reference to FIG. 3 in which the sheet feeding device is viewed from the side, FIG. 4 in which the sheet feeding table is viewed from above, and FIG. The printing paper 13 taken out of the feeder 5 and fed onto the paper feed 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. At 14, the sheet is positioned in the width direction and supplied to the printing apparatus 1.
[0005]
A suction box 4 connected to a suction source is provided at a lower portion of the feeder board 3 to surely transport the printing paper 13 when the feeder board 3 moves, and a large number of holes 11 (transportation) are formed in the transport belt 6 and the feeder board 3. The belt (belt) and 10 (feeder board) are opened so that the printing paper 13 can be conveyed by suction.
[0006]
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, so that the air flows between the feeder board 3 and the transported printing paper 13. The air between them becomes thin, so that 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.
[0007]
In order to prevent this, a large 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 does not increase other than the transport belt 6. However, it is inevitable that the pressure around the transport belt is negative, though it is very small, so that the printing paper 13 is transported while in contact with the feeder board.
[0008]
However, one side of the printing paper 13 to be transported may already be printed. In this case, the printing surface comes into contact with the feeder board 3, and is further rubbed at the corners 15 of the above-described ventilation hole 12, and printed on the ventilation hole 12. In some cases, ink was deposited and stained the printed surface. In this 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]
[Problems to be solved by the invention]
In view of the above-described circumstances, the present invention provides a printing machine that does not rub off the printing ink even if the printing surface is on the feeder board side, and thus does not need to stain or clean the already-printed surface. The problem is to provide a paper transport device.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, as described in claim 1,
A paper having a paper feed table composed of an endless transport belt for adsorbing and transporting printing paper by arranging a large number of holes and a feeder board provided with a large number of suction holes provided below the transport belt. In a paper transport device of a double-sided printing press that transports printing paper having one side printed from the pile side to a printing device,
The conveyor belt near on the feeder board, the ventilation grooves opened to the atmosphere from the end of the feeder board to the edge along the print paper flow direction one or a plurality present, other than the suction conveyance belt portion of the feeder board is atmospheric pressure as single surface of the printed and the is characterized in that to prevent rubbing with vents and the feeder board.
[0011]
By in this way provided the ventilation grooves from the end of the feeder board to the end, there is nothing corresponding to the corners of conventional such vents, be already printed surface conveyed through the ink of the previously printed surface No scraping. Further, since the corner 17 of the ventilation groove is a part that is sufficiently opened to the atmosphere, the printing paper does not come into strong contact with the corner. Therefore, the printing ink does not accumulate on the printed surface (one side on which printing has been performed ) , 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.
[0012]
In the second invention, as described in claim 2,
A vent which is open to the atmosphere at a plurality of bottom ventilation grooves provided, migraine surface of printed as whole ventilation groove is on average atmospheric pressure, characterized in that to prevent rubbing with ventilation grooves .
[0013]
By doing so, the ventilation port 12 has no opening at the place where it contacts the printing paper on the feeder board 3, and does not scrape the printing ink. In addition, the presence of the ventilation port 12 makes the entire ventilation groove 16 evenly atmospheric pressure, thereby preventing one side of the printing paper that has been printed from rubbing against the feeder board 3 and preventing the already printed surface from being stained. Is improved.
[0014]
According to a third aspect of the present invention,
A paper having a paper feed table composed of an endless transport belt for adsorbing and transporting printing paper by arranging a large number of holes and a feeder board provided with a large number of suction holes provided below the transport belt. In a paper transport device of a printing press that transports printing paper from a pile side to a printing device,
In the vicinity of the transport belt on the feeder board, one or a plurality of ventilation grooves which are open to the atmosphere from one end of the feeder board to the other along the flow direction of the printing paper are provided. Is not rubbed by the ventilation groove.
[0015]
By thus rounding the corners of ventilation grooves, even without scraping off the printing ink as a finished print surface (one surface of the printed) is in contact with the feeder board, that pollute the already printed surface therefor Prevention to improve print quality.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be illustratively described in detail 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
[0017]
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. The same components as those of the above-described conventional apparatus are denoted by the same reference numerals.
[0018]
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, and 9 is a front side. Here, 14 is a horizontal needle, 16 is a ventilation groove, and 17 is a top corner of the ventilation groove 16.
[0019]
Among these, the ventilation groove 16 replaces the conventional ventilation port 12, which is located near both sides of the conveyor belt 6 on the feeder board 3 as shown in FIG. In addition to the provision of a groove in the direction, a ventilation port 12 is provided at the bottom of the groove to allow suction by the suction box 4, and the corner 17 on the upper surface of the ventilation groove 16 is rounded.
[0020]
The ventilation groove 16 may be formed as a single groove on each side of the conveyor belt 6 as shown in FIG. 2A, or as two or more as shown in FIG. 2B. .
[0021]
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 transported on the feeder board 3 by the endless transport belt 6 driven by the drive shaft 8, and is moved by the front end 9. The paper is supplied to the printing apparatus 1 after being positioned in the up-down direction and the width direction by the horizontal needle device 14.
[0022]
When the printing paper 13 is transported on the feeder board 3, the printing paper 13 is attracted 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, since the ventilation groove 16 penetrates to the end of the feeder board 3 along the flow direction of the printing paper 13 and the ventilation hole 12 is provided at the bottom of the groove, it is possible to prevent a portion other than the conveyor belt 6 from being under a negative pressure. it can. Therefore, the printing paper 13 is not strongly rubbed against the feeder board 3.
[0023]
Also, since the vent hole 12 of the vent groove 16 does not have the corner portion 15 existing on the feeder board 3 as in the conventional device and further has a rounded upper corner portion 17, even if the printing paper 13 rubs against the feeder board 3. Even if it is used, there is no portion for scraping the printing ink, and the occurrence of printing stains can be prevented.
[0024]
【The invention's effect】
As described above, according to the first aspect of the invention, since the ventilation groove is provided from one end of the feeder board to the other, there is no such thing as the corner of the ventilation hole as in the related art, and the printed surface is conveyed. It does not scrape the ink on the printed surface. Further, since the corner 17 of the ventilation groove is a part that is sufficiently opened to the atmosphere, the printing paper does not come into strong contact with the corner. 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.
[0025]
Further, according to the second aspect, the ventilation port 12 has no opening at a position where it comes into contact with the printing paper on the feeder board 3, and does not scrape the printing ink. 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.
[0026]
According to the third aspect of the present invention, the corners of the ventilation grooves are rounded to prevent the printing ink from being scraped off even if the printing surface comes into contact with the feeder board, thereby preventing the already printed surface from being stained. 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 the 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 device 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 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)

A paper having a paper feed table composed of an endless transport belt for adsorbing and transporting printing paper by arranging a large number of holes and a feeder board provided with a large number of suction holes provided below the transport belt. In a paper transport device of a double-sided printing press that transports printing paper having one side printed from the pile side to a printing device,
The conveyor belt near on the feeder board, the ventilation grooves opened to the atmosphere from the end of the feeder board to the edge along the print paper flow direction one or a plurality present, other than the suction conveyance belt portion of the feeder board is atmospheric pressure way printing press of the paper conveying apparatus-sided printing already is characterized in that to prevent rubbing with vents and the feeder board. A vent which is open to the atmosphere at a plurality of bottom ventilation grooves provided, migraine surface of printed as whole ventilation groove is on average atmospheric pressure, characterized in that to prevent rubbing with ventilation grooves A paper transport device for a printing press according to claim 1. A paper having a paper feed table composed of an endless transport belt for adsorbing and transporting printing paper by arranging a large number of holes and a feeder board provided with a large number of suction holes provided below the transport belt. In a paper transport device of a printing press that transports printing paper from a pile side to a printing device,
In the vicinity of the transport belt on the feeder board, one or a plurality of ventilation grooves which are open to the atmosphere from one end of the feeder board to the other along the flow direction of the printing paper are provided. There paper conveying apparatus of printing machine characterized in that to prevent rubbing with venting slots.

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