JP3368324B2 - Paper feeder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a sheet-fed printing machine,
Paper deformation such as "warp" and "curl" and "blocking"
The present invention relates to a paper feeding device that can be easily and properly fed without being affected by the above.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 1, a sheet feeding device of a sheet-fed printing press has an air blower () for a rear portion of a laminated sheet P stacked on a paper stack (not shown). By 6)
A sheet separating tool that blows air to make the upper part of the laminated sheet P stand up and sucks the uppermost sheet by the first suction sucker (7) and also detects the height of the laminated sheet P. (5) intervenes in the direction of arrow A to press the sheet next to the uppermost sheet, and the second suction sucker (8) supplies only one sheet in the direction of arrow B. ing. In FIG. 1, (18) and (19) are guides for regulating the lateral and rearward positions of the laminated sheet P with respect to the sheet feeding direction B, and (22) is a front cover for regulating the forward position. Is.

In printing sheets, the paper changes in humidity,
Deformation of the paper such as "warp" and "curl" occurs due to the double-sided property and the fiber orientation. Especially when printing on both sides of the paper, the tendency is due to the mechanical stress at the time of pre-printing. It has become noticeable. Therefore, when the sheets are stacked on the sheet stacking plate of the sheet-fed printing press, the shape of the laminated sheet P becomes wavy, which is far from the ideal horizontal state for feeding. On the other hand, Japanese Utility Model Application Laid-Open No. 61-105339, "Sabaki Blowing Tool," proposes a configuration in which the angle of the front surface of the air blowing tool can be adjusted arbitrarily. In Japanese Utility Model Application Laid-Open No. 1-88637, "Sheet-fed printing press", a staggered pattern of air-blowing holes of an air-blowing device is proposed. However, these proposals are effective when the deformation of the paper is small, but cannot be applied when the deformation of the paper is large, such as when printing on both sides of the paper.

Therefore, when the deformation of the sheet is large, the sheet shown in FIG.
As shown in Fig. 2, various wedges (1), (2), (3) and (4) having different sizes as shown in Fig. 2 are combined and inserted between the stacked sheets, or the insertion depth is changed. By doing so, the shape of the stacked sheets is corrected. In addition, when printing on both sides of the paper one by one, blocking phenomenon may occur in which the printed materials adhere to each other due to the stickiness of the ink during pre-printing. Handles the paper manually to remove the adhesion between the sheets according to the degree of blocking. If the correction by the “wedge” is insufficient, the paper does not have a shape and height suitable for the first suction sucker (7) and the second suction sucker (8) in FIG. 1, and stable feeding cannot be performed. For this reason, as the work progresses, a subtle “wedge” insertion adjustment is required according to the state of the paper at that time, which requires continuous monitoring work by an expert. Further, when the sorting work is insufficient, two or more sheets are fed at the same time because the sheets are adhered to each other, resulting in defective printing or mechanical stoppage due to the operation of the two-sheet feeding defect detection device. However, there was a problem that work efficiency was reduced.

[0005]

In the conventional paper feeding device,
If the paper is warped or curled, the deformation of the paper becomes more noticeable as the number of stacked sheets increases.Therefore, insert a “wedge” between the papers to ensure that the paper is fed correctly. There is a problem that work to perform correction is required, the work requires a high degree of skill, and continuous monitoring work is required, and when blocking occurs, handling work is poor because it requires sorting work. Had. The present invention has been made in view of the problems that cannot be solved by the above-described conventional technology, and an object of the present invention is to use it for correcting the shape of a sheet in a sheet feeding unit of a sheet-fed printing press. It is an object of the present invention to provide a paper feeding device that is not affected by deformation and adhesion of paper without using the "wedge" that has been used.

[0006]

In order to achieve the above object, the present invention relates to a sheet feeding device of a sheet-fed printing press, in which the uppermost sheet of laminated sheets is sucked and transferred by suction sucker and sent to a conveying roller. A compressed air blowing nozzle that is installed opposite to the laminated sheet at a desired distance from the laminated sheet, a ceiling guide installed at a desired distance above the laminated sheet, and a laminated sheet. It is characterized in that a sheet side regulation guide is installed on the lateral upper part of the paper sheet so as to be in contact with the paper sheet, and a gripping edge guide is installed at an upper rear part of the laminated sheet paper so as to be in contact with the paper sheet. To do.

More specifically, as shown in FIG. 3, the paper feeding apparatus of the present invention blows compressed air from the compressed air blowing nozzle (9) to the side surface of the paper so that the paper above the laminated paper is floated. It is to feed. The compressed air blowing nozzle (9) has a mechanism in which the blowing angle, the blowing position, and the blowing distance can be arbitrarily adjusted according to the deformation of the paper, and when a plurality of nozzles are used, they can be individually adjusted.

This floated sheet is held at a constant height and at a constant position by the upper guide (17), the sheet side surface regulating guide (18) and the movable gripper edge guide (19) shown in FIG. It holds the shape, height and position most suitable for the soccer (7) and the second suction soccer (8).

In order to ensure the paper feeding by the paper feeding device according to the present invention, the gripping edge suction (20) always sucks and holds the second sheet from the top, so that a plurality of sheets can be fed simultaneously. Use a mechanism that does not feed paper.

Further, it is desirable that the gripper butt guide (19) has a mechanism that flips up backward by 90 ° or more by a hinge means or the like. This is because if the machine is stopped during printing, the trial printing paper can be easily inserted in the upper portion of the laminated paper in preparation for reprinting.

Further, in order to adjust the height of the laminated sheets, a height detecting capacitance sensor is installed at a desired distance from the laminated sheets at a substantially boundary between the floating sheet and the fixed sheet.

[0012]

With the compressed air blowing mechanism, air is generated between the laminated sheets, and the sheets are lifted while being separated one by one, and the upper guide (17), the sheet side regulating guide (18), and the movable gripper are also provided. Since the shape correction and the height / position regulation are performed by the butt guide (19), the state in which the paper can be reliably fed can be maintained regardless of the deformation and adhesion of the paper.

[0013]

EXAMPLES Specific examples of the present invention will now be described with reference to the drawings, but the present invention is not limited thereto. 3 and 4 show a sheet feeding device of the present invention, and FIG. 3 is a schematic view of a sheet feeding unit in which the sheet feeding device of the present invention is installed. Figure 4
FIG. 3 is a schematic view showing a mechanism of a compressed air blowing nozzle in the paper feeding device of the present invention.

As shown in FIGS. 3 and 4, the compressed air blowing nozzle (9) has a blowing distance adjusting slide (1).
0), the spraying position adjusting slide (11), and the spraying angle adjusting slide (12) are connected to each other, and they are located on the side of the laminated sheet P and are properly attached to a printing machine frame (not shown) ( 14). Compressor (1
The compressed air discharged from 6) has a mechanism that can be adjusted by a blowing strength adjusting valve (13) according to the shape of the paper.
The upper guide (17) is fixed to a mounting tool (15) that is appropriately attached to a printing machine frame (not shown), and the height of the paper floated by compressed air is regulated, so that the paper becomes prominent when the paper is stacked. The mechanism is capable of maintaining the proper height and shape of the paper without being affected by the deformation, and has a lattice shape, but the shape may be a fork shape as shown in FIG. The paper side surface regulation guide (18) is fixed to a mounting tool (15) properly attached to a printing machine frame (not shown), and regulates the left and right position of the paper which is floated by the compressed air of the compressed air blowing nozzle.

FIG. 6 is a schematic view showing the mechanism of the movable gripper edge guide (19) in the paper feeding device of the present invention. Movable gripper butt guide (19) as shown in FIG. 3 above.
Is fixed to the printer frame (not shown) to regulate the front and rear position of the floated paper by the compressed air of the compressed air blowing nozzle, and to easily load the trial printing paper on the top of the paper when the machine is stopped. The mechanism is such that, by means of hinge means or the like, it is flipped up backward by 90 ° or more around the fulcrum (23) (position indicated by dotted line in FIG. 6).

FIG. 7 is a perspective view showing the gripping edge suction in the paper feeding device of the present invention. 3 and 7 described above.
As shown in, the gripping edge suction (20) is installed at both ends of the paper, and the second paper is sucked from the top of the paper to prevent a plurality of simultaneous paper feeds, and the first suction sucker (7). It is installed at both ends of the paper in order to effectively operate the gripper suction (20).

Further, the height of the entire sheet is fixed to a mounting tool (15) appropriately attached to a printing machine frame (not shown) for detecting the height, and the boundary between the floating sheet and the fixed sheet is detected. Control by that.

[0018]

INDUSTRIAL APPLICABILITY The paper feeding device of the present invention is effective for the overprinting in which the deformation of the printing paper is severe, especially for the postprinting in the overprinting of the intaglio printing, and requires the skill so far.
It is possible to omit the “wedge” insertion work and the paper separation work that require continuous monitoring work.

Further, the sheet is floated by the jet of compressed air, and the upper guide (17) and the sheet side surface regulating guide (18).
Also, since the movable gripper edge guide (19) regulates the height and the positions of the front, rear, left, and right, stable feeding is always performed regardless of the deformation of the paper, and work is performed when many sheets are continuously printed. Even when docking the supply paper, which is necessary for the progress of the paper feed, the paper is kept at the proper height without being affected by the deformation of the paper and sudden changes in the paper height. The number of machine stoppages caused by defects is reduced, and since the above-mentioned skill-consuming "wedge" correction work is no longer required, anyone can easily work. Workability and work efficiency can be improved in combination with the reduction of paper troubles.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a conventional sheet feeding device in a sheet-fed printing press.

FIG. 2 is a perspective view showing the form of a “wedge”.

FIG. 3 is a perspective view of a paper feeding unit in which the paper feeding device of the present invention is installed.

FIG. 4 is a schematic view showing a mechanism of a compressed air blowing nozzle in the paper feeding device of the present invention.

FIG. 5 is another example of the upper guide in the paper feeding device of the present invention.

FIG. 6 is a perspective view showing a mechanism of a movable gripper edge guide in the paper feeding device of the present invention.

FIG. 7 is a perspective view showing the gripping edge suction in the paper feeding device of the present invention.

[Explanation of symbols]

1,2,3,4 wedge 5 Paper handling tools 6 air blower 7 First suction soccer 8 second suction soccer 9 Compressed air blowing nozzle 10 Spraying distance adjustment slide 11 Blow position adjustment slide 12 Blow angle adjustment slide 13 Spraying strength adjustment valve 14,15 Attachment 16 compressor 17 Upper guide 17 'upper guide 18 Paper side regulation guide 19 Movable Mouth Butt Guide 20 Mouth ass suction 21 Height sensor 22 Front cover 23 Movable Mouth Butt Guide Splashing Support Point

Claims (5)

(57) [Claims] 1. A sheet which is provided with a plurality of sheet regulation guides installed around the laminated sheet so as to be substantially in contact with the sheet, and sucks and conveys the uppermost sheet of the laminated sheet with a suction sucker and sends it to a conveying roller. In a sheet feeding device of a leaf printing machine, a compressed air blowing nozzle is provided at a lateral upper part of a laminated sheet so as to face the laminated sheet at a desired distance, and a desired distance is provided above the laminated sheet. A sheet feeding device for a sheet-fed printing press, which is provided with a lattice-shaped or fork-shaped upper guide installed. 2. The sheet feeding device according to claim 1, wherein the compressed air blowing nozzle can arbitrarily adjust the compressed air blowing strength according to the shape of the laminated sheet by a valve. 3. The paper feeding device according to claim 1, wherein the gripper edge guide installed at the rear portion with respect to the sheet conveying direction is configured to be flipped up backward by 90 ° or more by a hinge means or the like. 4. Installed on the upper side and both ends of the laminated sheet,
2. The sheet feeding device according to claim 1, further comprising a gripping edge suction for sucking the next sheet of the sheets sucked by the first suction sucker and holding the sheet at a fixed position. 5. A capacitance sensor for detecting the height of the laminated sheet is provided at a side of the laminated sheet and at a substantially boundary between the floating sheet and the fixed sheet with a desired distance from the laminated sheet. The sheet feeding device according to claim 1, wherein the sheet feeding devices are opposed to each other.