CN216889208U - Paper feeding device for offset press - Google Patents

Abstract

The utility model discloses a paper conveying device for an offset press, which belongs to the technical field of paper conveying and comprises a paper conveying belt, wherein the paper conveying belt is provided with an upper paper end and a lower paper end and is used for conveying paper from the upper paper end to the lower paper end; the paper pressing roller is arranged above the paper conveying belt and used for increasing the friction force between the paper conveying belt and paper; the blowpipe sets up in defeated paper tape top and is located the upper reaches of pressing the paper gyro wheel, and the blowpipe has the air outlet that sets up towards paper end preceding paper tail end down for make down paper end preceding paper tail end and back paper head end separation. The paper conveying belt is provided with the paper pressing roller and the blowing pipe, paper is stabilized on the paper conveying belt through the rolling action of the paper pressing roller on the paper, the front paper is separated from the rear paper through the blowing action of the blowing pipe on the tail end of the front paper, the normal separation of adjacent paper is realized, each paper is ensured to enter the gauge mechanism correctly, and the faults and the stop times of the offset press are reduced.

Description

A paper feeding device for an offset printing machine

technical field

The utility model relates to the technical field of paper conveying, in particular to a paper conveying device for an offset printing machine.

Background technique

As shown in FIG. 4 , the working principle of the suction-type paper-feeding platen offset press is to use negative pressure suction to absorb the paper 60 on the paper-feeding belt 10 of the paper-feeding platen, and the paper 60 passes through the gap between the paper-feeding belt 10 and the paper 60 . The friction between the paper 60 and the conveyor belt 10 is synchronously conveyed forward, so that the paper 60 separated by the paper separating mechanism 70 of the upper paper end 11 of the paper conveying belt 10 enters the regulation mechanism 80 of the lower paper end 12 of the paper conveying belt 10 successively. .

However, when an offset press is used to print special paper with a smooth and smooth surface, the front and rear paper on the conveyor belt often sticks and cannot be separated normally and enter the regulation mechanism correctly, resulting in printing failure and downtime.

SUMMARY OF THE INVENTION

After research, it is found that when using the existing offset printing machine to print special paper, the reason for the failure is: the surface of the special paper is smooth and smooth, and the strong negative pressure suction will put the front and rear paper in the conveying process of the special paper on the paper belt. The air between the two sheets is squeezed clean, resulting in serious adhesion between the front and rear sheets (refer to the physical properties of the "Madeburg Hemisphere Experiment"), resulting in the inability to completely separate the front and rear sheets, and the inability to enter the regulation mechanism correctly, and then cause printing failures.

In view of this, the purpose of the present invention is to provide a paper feeding device for an offset printing press, so as to solve the technical problem of paper sticking existing in the existing paper feeding device.

The technical scheme adopted by the utility model is: a paper feeding device for an offset printing machine, which is used for conveying the paper separated by the paper separating mechanism to the regulation mechanism, comprising:

a paper conveying belt, the paper conveying belt has an upper paper end and a lower paper end, and the paper conveying belt is used for conveying the paper from the upper paper end to the lower paper end;

a paper pressing roller, the paper pressing roller is arranged above the paper conveying belt, and is used for increasing the friction between the paper conveying belt and the paper;

The blowing pipe is arranged above the paper conveying belt and upstream of the platen roller. The trailing end of the front paper is separated from the leading end of the trailing paper on the lower paper end.

Preferably, the air outlet pressure of the air outlet of the blowing pipe is 1 bar to 5 bar.

Preferably, the air outlet pressure of the air outlet of the blowing pipe is 2 bar to 3 bar.

Preferably, the blowing angle of the blowing pipe is 10°˜45°.

Preferably, the blowing angle of the blowing pipe is 15°˜30°.

Preferably, the blowing pipe is a shapeable pipe, an air inlet end of the shapeable pipe is connected to an air source, and an air outlet end is disposed toward the tail end of the front paper on the lower paper end.

Preferably, the shapeable tube is a universal bamboo tube.

Preferably, the air volume of the blowing pipe is adjustable.

Preferably, the blowing pipe is provided with a regulating valve for adjusting the air volume of the blowing pipe.

Preferably, the paper feeding device further comprises a reversible paper pressing frame arranged above the paper feeding belt, the paper pressing roller is rotatably arranged on the paper pressing frame; the blowing pipe is arranged along the paper feeding The belt is arranged in the width direction, and the two ends of the blowing pipe are fixedly connected with the platen frame, and a plurality of air outlets are linearly distributed on the blowing pipe.

The beneficial effects of the present utility model:

1. The utility model is provided with a paper pressing roller and a blowing pipe on the paper conveying belt, the paper is stabilized on the paper conveying belt by the rolling action of the pressing paper roller on the paper, and the front The paper is separated from the back paper to realize the normal separation of adjacent papers, to ensure that each paper enters the regulation mechanism correctly, and to reduce the failure and downtime of the offset printing machine.

2. The blowing pipe in this utility model is a universal bamboo tube that can be shaped, which is not only convenient to adjust the position and angle of the air outlet of the blowing pipe above the paper conveying belt, but also can quickly blow the blower when the paper is jammed. The tube is removed to prevent the blowing tube from interfering with the upward turning of the platen frame.

3. In the utility model, the air output of the blowing pipe can be adjusted, so that the offset printing machine can be applied to the printing operation of different special papers.

4. The blowing pipe in the utility model is arranged along the width direction of the paper conveying belt and is connected with the paper pressing frame, which is convenient for turning the pressing paper frame upwards when the paper is jammed, and at the same time, the blowing pipe can be quickly reset.

Description of drawings

Fig. 1 is one of the structural representations of the paper feeding device for an offset printing press of the present invention;

2 is a partial enlarged view of the paper feeding device for an offset printing press of the present invention;

3 is the second schematic diagram of the structure of the paper feeding device for an offset printing press of the present invention;

FIG. 4 is a schematic structural diagram of a conventional sheet feeding device for an offset printing press.

Description of the reference numbers in the figure:

10. Paper belt;

11. Upper paper end;

12. Lower paper end;

20. Platen roller;

30. Blow pipe;

31. Air outlet;

32. Control valve;

40. Pressed paper frame;

50. Wind source;

60. Paper;

61. Front paper;

62. Back paper;

70. Paper separation mechanism;

80. Rules and regulations.

Detailed ways

The specific embodiments of the present utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "horizontal", "upper", "lower", "front", "rear", "left", "right", The orientation or positional relationship indicated by "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplified description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; may be mechanical connection or electrical connection; may be direct connection, or indirect connection through an intermediate medium, or internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

An embodiment, as shown in Figures 1-3, is a paper feeding device for an offset printing press, which is used for feeding the paper 60 separated by the paper separating mechanism 70 to the regulating mechanism 80; the device includes:

a paper conveying belt 10, the paper conveying belt 10 has an upper paper end 11 and a lower paper end 12, the paper conveying belt 10 is used for conveying the paper 60 from the upper paper end 11 to the lower paper end 12;

at least one set of paper pressing rollers 20, the paper pressing rollers 20 are arranged above the paper conveying belt 10 for increasing the friction between the paper conveying belt 10 and the paper 60, and maintaining the stability of the paper 60;

A blowing pipe 30, the blowing pipe 30 is arranged above the paper conveying belt 10 and upstream of the platen roller 20, the blowing pipe 30 has an air outlet 31 disposed toward the tail end of the upper front paper 61 at the lower paper end 12, and the air outlet 31 blows out The positive pressure wind can separate the trailing end of the front sheet 61 from the leading end of the trailing sheet 62 on the lower sheet end 12 .

In the present application, a paper pressing roller 20 and a blowing duct 30 are arranged on the paper conveying belt 10. The paper 60 is stabilized on the paper conveying belt 10 by the rolling action of the pressing roller 20 on the paper 60, and the front paper 61 is blown by the blowing duct 30. The blowing action of the tail end separates the front paper 61 and the rear paper 62, realizes the normal separation of the adjacent paper 60, ensures that each paper 60 enters the guide mechanism 80 correctly, and reduces the failure and downtime of the offset printing machine.

In a specific embodiment, the air outlet pressure of the air outlet 31 of the blowing pipe 30 is 1 bar˜5 bar. In this way, when the air outlet pressure of the air outlet 31 of the blowing pipe 30 is stronger than 5 bar, the stability of the paper 60 on the paper conveying belt 10 will be affected, resulting in unstable paper output, so that the paper 60 cannot enter the regulation mechanism 80 stably. When the air outlet pressure of the air outlet 31 of the blowing pipe 30 is less than 1 bar, the trailing end of the front sheet 61 cannot be lifted, and the separation of the adjacent sheets 60 cannot be achieved.

Preferably, the air outlet pressure of the air outlet 31 of the blowing pipe 30 is 2 bar˜3 bar.

In a specific embodiment, as shown in FIGS. 1 and 2 , the blowing angle of the blowing pipe 30 is 10°˜45°; it should be noted that the blowing angle refers to the air outlet direction of the air outlet 31 of the blowing pipe 30 . The included angle with the upper surface of the paper belt 10 . In this way, when the blowing angle of the blowing pipe 30 is greater than 45°, part of the blowing cannot act on the lifted paper 60 because the blowing angle is too large, resulting in a waste of air volume; when the blowing angle of the blowing pipe 30 is less than 10°, Because the blowing angle is too small, the leading end of the paper 60 is lifted up and separated from the paper conveying belt 10, so that the paper 60 cannot be conveyed normally.

Preferably, the blowing angle of the blowing pipe 30 is 15°˜30°.

In a specific embodiment, as shown in FIG. 1 and FIG. 2 , the blowing pipe 30 is a shapeable pipe, which means that the operator can arbitrarily change the shape of the blowing pipe 30 and fix it, and the blowing pipe after the shape is fixed 30 will not change its shape due to its internal wind pressure; the two ends of the shapeable pipe are the air inlet end and the air outlet end, respectively, and the air inlet of the air inlet end is directly connected to the air source 50, and can also be connected to the air source through the air supply pipe. 50 is connected, and the air source 50 is used to supply positive pressure air for the blowing pipe 30; the air outlet 31 at the air outlet end is set towards the tail end of the upper front paper 61 on the lower paper end 12, so that the positive pressure air blown out through the air outlet 31 will blow the front paper. The trailing end of 61 is lifted upwards, thereby realizing separation of adjacent sheets 60 . With this arrangement, because the shape of the blowing pipe 30 can be arbitrarily changed and fixed, the operator can adjust the position and position of the air outlet 31 of the blowing pipe 30 on the paper conveying belt 10 by changing the shape of the blowing pipe 30 according to the characteristics of the paper 60 . The air outlet angle is used to achieve separation of adjacent sheets 60 and ensure stable conveyance of sheets 60 .

Preferably, the shapeable tube is a universal bamboo tube, and the air outlet 31 of the universal bamboo tube is a flat rectangular air outlet.

In a specific embodiment, as shown in FIG. 1 , the air volume of the blowing pipe 30 is adjustable. This setting is because the surface finish of different papers 60 is different, resulting in different degrees of adhesion between adjacent papers 60. The air output of the blowing pipe 30 is set to be adjustable in size, and the size of the air output of the blowing pipe 30 can be adjusted by adjusting the size of the air output of the blowing pipe 30. , suitable for conveying different paper 60.

Preferably, a regulating valve 32 for adjusting the air output of the blowing pipe 30 is provided on the blowing pipe 30 ; In this way, the adjustment of the air volume of the blowing pipe 30 can be realized by controlling the regulating valve 32 .

In a specific embodiment, as shown in FIG. 1 and FIG. 2 , the paper conveying belt 10 is obliquely arranged between the paper separating mechanism 70 and the regulation mechanism 80 , and the upper end of the paper conveying belt 10 in a high position is the upper paper end 11 , and the upper The paper end 11 is set close to the paper separation mechanism 70, and is used to receive the paper 60 separated by the paper separation mechanism 70; the lower end 12 of the paper conveying belt 10 is located at the lower end, and the lower paper end 12 is set close to the regulation mechanism 80 and is used to separate the paper 60. The paper 60 is conveyed to the guide mechanism 80 . A plurality of paper pressing frames 40 are provided on the paper conveying belt 10 , and the plurality of paper pressing frames 40 are arranged in sequence along the conveying direction of the paper 60 , and the paper pressing frames 40 can extend to the width direction of the paper conveying belt 10 . One side is turned over, wherein the overturned connection between the paper pressing frame 40 and the paper conveying belt 10 is in the prior art, and will not be repeated here; The rollers 20 are a group, and a platen frame 40 is provided with a group of platen rollers 20. When a paper jam occurs on the paper conveying belt 10, the platen frame 40 can be turned upward to facilitate handling of jammed paper.

In a specific embodiment, as shown in FIG. 3, the blowing pipe 30 is a plastic pipe, the plastic pipe is arranged along the width direction of the paper conveying belt 10, and the two ends of the plastic pipe are fixedly connected with the paper pressing frame 40 through the support plate, One end of the plastic pipe is closed, and the other end is connected to an air source 50 (preferably a fan) through an air supply pipe (preferably a plastic hose). In this way, fixing the blowing pipe 30 to the paper pressing frame 40 can not only avoid the interference phenomenon between the paper pressing frame 40 and the blowing pipe 30 when the paper pressing frame 40 is turned upward, but also can quickly realize the reset of the blowing pipe 30 and reduce the Adjustment time of the blowpipe 30.

The use process of the tooling of the present utility model is as follows:

In the present application, a blowing pipe 30 with an adjustable air volume is installed on the paper conveying belt 10. The blowing pipe 30 sends the air between the front sheet 61 and the rear sheet 62 at the regulation mechanism 80 to destroy the atmospheric pressure formed by the vacuum. Further, the adsorption between adjacent sheets 60 is eliminated, so as to achieve the purpose of conveying the sheets 60 normally.

The blowing pipe 30 of the present application can adjust the size of the blowing volume, and the blowing pipe 30 only slightly blows the tail of the front paper 61 at the regulating mechanism 80, and blowing a small amount of air between the sheets 60 in the vacuum state can damage the paper 60. However, the head and middle of the front paper 61 are still adsorbed on the paper conveying belt 10 by the negative pressure suction holes on the paper conveying belt 10, so the stability of the paper 60 on the paper conveying belt 10 will not be damaged.

Compared with the prior art, the present application at least has the following beneficial technical effects:

In the present application, by adding a universal bamboo tube with adjustable air volume above the paper conveying belt 10, the problem of adsorption and adhesion of all special papers 60 is fundamentally solved, and the uninterrupted and stable transportation of the paper 60 is realized. Paper, ink, and labor losses caused by paper adhesion no longer exist, which improves production efficiency and quality.

The universal bamboo tube with adjustable air volume in the present application has low purchase and installation costs, does not cause any environmental pollution and additional energy loss, and is very convenient to operate.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, some improvements and replacements can be made without departing from the technical principles of the present invention. These improvements And replacement should also be regarded as the protection scope of the present invention.

Claims (10)

1. A paper feeding device for an offset printing press, for conveying the paper separated by a paper separating mechanism (70) to a regulation mechanism (80), characterized in that, comprising: A paper conveying belt (10), the paper conveying belt (10) has an upper paper end (11) and a lower paper end (12), and the paper conveying belt (10) is used for conveying the paper (60) from the upper paper end (12). 11) Conveying to the lower paper end (12); a paper pressing roller (20), the paper pressing roller (20) is arranged above the paper conveying belt (10), and is used for increasing the frictional force between the paper conveying belt (10) and the paper (60); A blowing pipe (30), the blowing pipe (30) is arranged above the paper conveying belt (10) and upstream of the platen roller (20), the blowing pipe (30) has a direction toward the lower paper The air outlet (31) provided at the rear end of the front paper (61) on the end (12) is used to separate the rear end of the front paper (61) from the head end of the rear paper (62) on the lower paper end (12). . 2 . The paper feeding device for an offset printing press according to claim 1 , wherein the air outlet pressure of the air outlet ( 31 ) of the blowing pipe ( 30 ) is 1 bar to 5 bar. 3 . 3 . The paper feeding device for an offset printing press according to claim 2 , wherein the air outlet pressure of the air outlet ( 31 ) of the blowing pipe ( 30 ) is 2 bar to 3 bar. 4 . 4 . The paper feeding device for an offset printing press according to claim 1 , wherein the blowing angle of the blowing pipe ( 30 ) is 10°˜45°. 5 . 5 . The paper feeding device for an offset printing press according to claim 4 , wherein the blowing angle of the blowing pipe ( 30 ) is 15°˜30°. 6 . 6 . The paper feeding device for an offset printing press according to claim 1 , wherein the blowing pipe ( 30 ) is a shapeable pipe, and the air inlet end of the shapeable pipe is connected to an air source (50 ). 7 . , the air outlet end is disposed toward the trailing end of the front paper (61) on the lower paper end (12). 7 . The paper feeding device for an offset printing press according to claim 6 , wherein the shapeable tube is a universal slub tube. 8 . 8 . The paper feeding device for an offset printing press according to claim 1 , wherein the air outlet volume of the blowing pipe ( 30 ) is adjustable. 9 . 9 . The paper feeding device for an offset printing press according to claim 8 , wherein the blowing pipe (30) is provided with a regulating valve (32) for adjusting the air volume of the blowing pipe (30). 10 . . 10 . The paper feeding device for an offset printing press according to claim 1 , wherein the paper feeding device further comprises a reversible pressing frame ( 40 ) arranged above the paper feeding belt ( 10 ), so that the The paper pressing roller (20) is rotatably arranged on the paper pressing frame (40); the blowing pipe (30) is arranged along the width direction of the paper conveying belt (10), and the blowing pipe (30) Both ends of the air blowing pipe (30) are fixedly connected with the paper pressing frame (40), and a plurality of air outlets (31) are linearly distributed on the blowing pipe (30).

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