JPH04345435A - Paper feeding method and feeding equipment - Google Patents

Abstract

PURPOSE:To feed sheets of paper stably by providing a guide bending a conveyor belt running to a paper feeding direction at a specified distance from the upper surface of loaded paper so as that a part of the belt is contacted to the upper surface rear end of the uppermost sheet of the loaded paper to separate and reverse it, and attracting the sheet through the belt. CONSTITUTION:A conveyor belt 1 covered over a driving roller 2 and a roller 3 is moved to a paper feeding direction at a specified distance from the upper surface of loaded paper 5, and the roller 3 side of the belt is arranged with a belt guide 1a so as that the belt is contacted to the end of the loaded paper 5 slantingly at an angle of about 45 deg.. Hence the loaded sheets of paper 5 are separated from others at the end one by one and vacuum attracted with an attracting jig 4 through the belt 1 and conveyed one by one while being reversed. A brush wheel 8 is provided at a corner to assist the reverse of the sheet by the belt 1. On the belt 1, projections for separation are provided, and the sheets of paper can be fed stably one by one without bending with the cooperation of the projections and the brush wheel 8.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding method and a paper feeding device for sheet-fed printing machines.

0002

2. Description of the Related Art Paper feeding devices for sheet-fed printing presses generally use conveying means using a suction mechanism. FIG. 8 shows an outline of such a conventional paper feeding device. First adsorber 12
After partially separating the paper 5 one by one, air is blown from the nozzle 13 to completely separate the paper. After that, P1
At the point, the second suction device 14 suctions the paper, and at the same time, the first suction device 12 releases the paper. The second suction device 14 moves forward while holding the paper, releases the paper at point P2, and is sent to the paper conveying section, completing one cycle of paper feeding.

[0003] The operation of the first and second adsorbers is performed by a link mechanism 15.
The vacuum pump 30 is used for adsorption and air blowing.
and an air pump 31. These air controls are also controlled by a rotary valve 11 built into the paper feeder main body 10.
This is done by Note that each device is connected by hoses 32. FIG. 9 shows the work process of the above-mentioned paper feeding work. Note that the white arrows in the figure indicate air flow.

[0004] Normally, a pair of first and second suction devices are provided in the left and right direction of the paper, but two pairs may be provided in order to maintain the posture of the paper.

[0005]

[Problems to be Solved by the Invention] Sheet-fed printing machines transport and print paper sheet by sheet. At this time, the paper is held by a number of claws installed on the printing cylinder, but the important point is that the paper fed from the paper feeder must always be in a fixed position. Otherwise, it will not be possible to print at a fixed position on the paper surface and problems will occur during cutting.

A major problem with the prior art is paper bending caused by the inability to feed the paper into a fixed position during paper feeding. If this paper bending is small, it can be corrected with a straightening device attached to the printing machine, but if it exceeds the straightening range, the printing machine will stop. Generally, this correctable range is up to about 5 mm. In the prior art, the operation of the adsorber and the separation of paper all rely on pneumatic operation, and the operation speed is also fast. For example, in the case of 10,000 sheets/hour, a high response characteristic of 0.36 seconds/cycle is required, but slight differences in this response often cause paper bending. Furthermore, the flapping of the paper due to the air blow for paper separation causes the suction timing to be lost and a similar result (paper bending) to occur.

[0007] The present invention provides a paper feeding section of a sheet-fed printing machine, in which:
It is an object of the present invention to provide a paper feeding method and a paper feeding device that prevent paper bending.

[0008]

Means for Solving the Problems A conveyor belt having a paper separating protrusion is used as a paper separating and conveying means, and the paper is reversed by the conveyor belt. The paper is fixed to the surface of the belt by a suction jig provided on the back side of the belt, and the paper is conveyed by the movement of the belt. Also, at this time, the belt material is made of a breathable material. For example, there is a mesh type or a pore type. Furthermore, in order to ensure separation at the edge of the paper, it is also effective to use an auxiliary jig such as a brush wheel to improve performance.

[0009]

[Operation] The edge of the paper is caught by the protrusion of the paper conveyance belt above the stacked paper surface, and the paper is reversed as the belt moves. At this time, in order to separate the paper one by one and make the hooking operation by the belt protrusion more accurate, a brush wheel-like machine is installed near both ends of the conveyor belt that partially separates the edge of the paper one by one using rotational force. Install auxiliary equipment. The reversed paper is sucked through the conveyor belt by a suction jig installed along the back surface of the conveyor belt, and is suctioned and fixed to the surface of the conveyor belt and conveyed. As a result, it is possible to prevent the conventional paper from bending due to flapping or the like.

0010

[Embodiment] In FIGS. 1 to 3, there is a conveyor belt 1 passed between a drive roller 2 and a roller 3.
The paper is reversely conveyed one by one. The roller 3 side of the conveyor belt 1 is inclined at an angle of about 45° due to the belt guide 1a, etc., and is arranged so as to be in contact with the corner of the end surface of the stacked paper.

The belt guide in this embodiment has a structure in which a large number of guide books 16 are provided on the conveyor belt 1 at equal intervals and draw a curve along the rail of the belt guide 1a. This belt guide 1a can be moved back and forth depending on the size of the paper. In addition, a suction jig 4 is attached inside the loop-shaped conveyor belt 1 along the back surface of the belt 1, and has the role of suctioning the reversed paper 55 through the belt 1 and fixing it on the belt 1. . In order to assist the paper reversing operation by the conveyor belt 1, a paper edge separating brush wheel 8 is attached. To separate and convey the paper one by one, the edges of the paper are separated by a brush wheel 8 and hooked onto protrusions 7 formed at equal intervals on the conveyor belt 1, and the paper 55 is reversed. At the same time, the paper 55 is suctioned and fixed onto the belt 1 by the suction jig 4 on the back surface of the belt 1 and is conveyed.

[0012] As the belt material, a breathable material, for example, a mesh type or a pore type material is used. Transport paper 5
5 is directly sent to the paper feed roller 9 and supplied to the printing machine. 4 and 5 show specific operating states. The exhaust blower 30 shown in FIG. 5 has a capacity of about 100 to several hundred mmAq.

FIG. 6 shows the details of the brush wheel 8 for paper edge separation, and such a paper edge separation method is as follows:
Methods such as air blowing, lifting the paper with a suction valve-like device, and separating methods can be used. Further, FIG. 7 shows a mechanism for ensuring paper edge separation by the brush wheel 8, in which the paper guide 6 moves back and forth (in the direction of the arrow) and operates in a direction to push out the upper surface of the stacked paper 5 by more than 10 mm. As a result,
Paper separation by the brush wheel 8 is ensured, contributing to improved performance of the paper feeding function.

Although the embodiments have been shown above, the width of the paper conveying belt varies depending on the paper size, but the width of the narrow belt can be
You can also line up three in parallel. Further, changes in the longitudinal direction of the paper can also be dealt with by moving the belt guide.

[0015]

Effects of the Invention: The present invention uses a protrusion provided on the surface of the conveyor belt to invert the paper, and uses a vacuum suction mechanism to securely feed the paper to the conveyor belt, thereby ensuring stable paper feeding without bending the paper. It becomes possible. Also, for speeding up,
Rotation control allows for more accurate paper feeding. Furthermore, even when printing on the back side, there is no need to turn the printed paper over beforehand, and the paper can be fed as is.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a paper feeding device according to an embodiment of the present invention.

FIG. 2 is a view taken along arrow A in FIG. 1;

FIG. 3 is a sectional view taken along line XX in FIG. 2;

FIG. 4 is a side view of FIG. 1;

FIG. 5 is a side view showing suction of paper by the conveyor belt.

FIG. 6 is a side view of the paper edge separation brush wheel.

FIG. 7 is a side view of the paper edge separation paper guide.

FIG. 8 is a schematic diagram of a conventional paper feeding device.

9 is a diagram showing a working process of the conventional device shown in FIG. 8. FIG.

[Explanation of symbols]

1 Conveyor belt 4 Suction jig 5 Loading paper 55 Transport paper 8 Brushing wheel

Claims (3)

[Claims] [Claim 1] A paper feeding method characterized by separating the rear end of the upper surface of the stacked sheets in the paper feeding unit from the lower surface stacked paper, and inverting and conveying the stacked paper so that the trailing edge becomes the leading edge in the paper feeding direction. . 2. A conveyance belt running in the paper feeding direction at a predetermined distance from the top surface of the stacked papers of the paper feeding unit, and a part of the conveyance belt touching the rear end of the top surface of the stacked papers to separate and invert the stacked papers. A paper feeder comprising: a guide for bending the conveyor belt; and a suction jig for suctioning the reversed loaded paper through the conveyor belt. 3. The paper feeding device according to claim 2, wherein a plurality of protrusions are provided at equal intervals on the surface of the conveyor belt.