JPH09301564A - Paper sheet guiding device in paper feeder of printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the quality of printing by preventing a mistake in catching in a swing device. SOLUTION: The topmost paper sheet of stacked paper sheets 10 is separated from the lower paper sheets by air blown from a blowing leg of a sucker device and fed to a guide plate 23. The paper sheet 10 fed to the guide plate 23 is guided from the guide plate 23 to a feeder board 24 and conveyed to an inserting plate by a conveying belt 30. The guide plate 23 is formed into a circular-arc shape in viewing from the side so that the front end 23a and the rear end 23b of the guide plate 23 may be bent downward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet guide device for guiding a sheet from a sheet feeding device to a printing unit in a printing machine, and more particularly to a guiding device interposed between the sheet feeding device and a feeder board. It is about improvement.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show a sheet guide device in a sheet feeding device of a conventional printing machine. FIG. 3 is a side view showing the whole, and FIG. 4 (a) is a side view showing an essential part. The figure and (b) are IVb arrow views in (a). The sheet guide device in the sheet feeding device of the conventional printing machine will be described with reference to these drawings. The sheet guide device generally indicated by reference numeral 1 is provided with left and right sheet feeding frames 2 and each sheet feeding device is provided. A pair of left and right sucker frames 3 horizontally project from the upper rear end of the frame 2 to the rear side, and a sucker device generally designated by 4 is supported on the sucker frame 3.

The sucker device 4 includes a plurality of vertically movable first suction ports 5 arranged side by side in the machine width direction, and a plurality of vertically moving and back-and-forth movement arranged in two rows in the machine width direction in front of the first suction ports 5. The second suction port 6 and the blower foot 7 directed to the front side are provided behind the first suction port 5, and the first and second suction ports 5 and 6 are vacuum as an air source (not shown). It is connected to a pump, and the blow foot 7 is connected to a compression pump (not shown) as an air source.

When the first suction port 5 is lowered, the paper 10 is stacked on the paper stacking platform 8 which can be raised and lowered through the chain 9.
The rear end of each of the upper layers is sucked and raised one by one, and the second suction port 6 sucks the central portion of the paper 10 sucked by the first suction port 5 and ascends, and then advances. The front end of 10,
A paper feed roller 14 which will be described later and is rotating in contact with the top and bottom.
And the paper feed roller 17 are configured to be captured. Air is blown from the blower foot 7 between the uppermost layer of paper sucked up by the first and second suction ports 5 and 6 and the lowermost sheet of paper, whereby the uppermost layer of paper and the lowermost layer of paper are separated from each other. It is configured such that the separated papers 10 are fed one by one by the first and second suction ports 5 and 6.

Reference numeral 11 is a front pad for aligning the front ends of the papers 10 stacked on the paper stacking platform 8, and a paper feed restricting member 12 which is erected and laid down by a cam mechanism is provided at the upper end.
The paper feed restricting member 12 is configured to fall down in synchronism with the uppermost paper being fed to the paper feed roller 14 by the first and second suction ports 5 and 6. Paper feed roller 1
4 is rotatably driven by the paper feed frame 2 and axially supported so as to be positioned in a gap 13 formed between the paper feed restriction member 12 and the front end of a guide plate 23 described later.
Two arms 7 are formed in a small width and are provided in a direction orthogonal to the conveyance direction of the paper 10, and one end of which is fixed to a shaft 15 which is driven to reciprocally rotate in the paper feed frame 2 and is pivotally supported. The other end of 16 is rotatably supported. The paper feed roller 17 is pressed against the paper feed roller 14,
The arm 16 swings around the shaft 15 so that the paper feed roller 17 is separated from the paper feed roller 14 in synchronization with the feeding of the uppermost sheet by the suction ports 5 and 6. ing.

Reference numeral 19 denotes a paper regulation guide rod formed in a side-view substantially "shi" shape for regulating the lifting of the paper 10, and is fixed to a stud 20 which is horizontally mounted between the paper feed frames 2. The base portion is attached to the holder 21 and the paper regulating portion 19a at the other end is positioned above the guide plate 23 so as to be close thereto. The guide plate 23 is formed of an elongated rectangular flat plate, and is attached to a holder 22 a fixed to a stud 22 that is horizontally mounted on the paper feed frame 2. The uppermost paper sheet 10 separated from the lower layer paper sheet 10 by the air from the blowing foot 7 and captured by the paper feed roller 14 and the paper feed roller sheet 17 is moved upward by the paper sheet regulation portion 19 a of the paper sheet regulation guide 19. The movement is restricted, and the sheet is guided by the feeder board 24 while being attached to the guide plate 23. Reference numeral 27 denotes a drive roller that faces a gap 25 formed between the guide plate 23 and the feeder board 24, and a plurality of drive rollers are arranged side by side in a direction orthogonal to the transport direction of the paper 10, and a frame of a printing machine (not shown). Further, it is fixed to a drive shaft (not shown) that is rotatably driven in conjunction with the prime mover of the printing machine and is axially supported.

Reference numeral 28 denotes a driven roller which is located at the rear end of the feeder board 24 and is rotatably supported by a shaft (not shown) horizontally mounted on the frame of the printing machine. A plurality of sheets 10 are arranged side by side in a direction orthogonal to the conveying direction. Reference numeral 30 denotes a conveyor belt stretched between the rollers 27 and 28 via a tension roller 29, and a plurality of conveyor belts are arranged side by side in a direction orthogonal to the conveying direction of the paper 10 and horizontally laid on the frame of the printing machine. A guide roller 32 rotatably supported on the shaft is attached. Therefore, the paper 10 guided on the feeder board 24 by the guide plate 23 is nipped by the conveyor belt 30 and the guide rollers 32, and is conveyed on the feeder board 24 by the traveling of the conveyor belt 30. After being sent to the omitted slip plate, the front end provided on the front end of the slip plate aligns the tips, and then the jaws are gripped by the swing device and replaced by the claws of the impression cylinder of the printing unit.

[0008]

In recent years, there has been an increasing demand for speeding up of printing presses. With this demand, the air pressure from the blowing feet 7 of the sucker device 4 is increased, and the papers 1 loaded on the paper stack 8 are loaded.
It is designed to ensure that 0s are separated one by one. In this way, when the air pressure from the blowing feet 7 of the sucker device 4 is increased and the paper 10 is fed at high speed, the paper 10 is sent to the guide plate 23 while the air remains under the paper 10. Information board 23
Then, the paper regulating portions 19a of the plurality of paper regulating guide rods 19 are partially pressed to the guide plate 23 side at intervals in the direction orthogonal to the transport direction of the paper 10. Therefore, paper 1
The paper 10 in which air has accumulated below 0 has a space between the paper regulating guides 19, particularly a central portion 1 as shown by a two-dot chain line in FIG.
The air 0a swells upward by the air staying on the lower side without coming into close contact with the guide plate 23, which becomes remarkable especially in the case of thin paper. The paper 10 guided on the feeder board 24 in such a bulged state is
On the feeder board 24, the guide roller 32 and the conveyor belt 30 partially sandwich the sheet 10 at intervals in the direction orthogonal to the conveying direction of the paper 10, so that the central portion 10a does not stick to the feeder board 24 and expands. It will be conveyed to the front contact side of the difference plate as it is. For this reason, even if the front end of the slip plate is aligned, it is gripped by the claws of the swing device as it is and is replaced by the claws of the impression cylinder. As a result, a double image is generated due to this, which causes a deterioration in print quality. In addition, when the amount of upward swelling of the feeder board 24 is remarkable, it cannot be gripped by the claws of the swing device, which may cause a paper jam or a failure of the printing machine.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a sheet guide device in a sheet feeding device of a printing machine, which is intended to improve printing quality. To do.

[0010]

In order to achieve this object, a sheet guiding device in a sheet feeding device of a printing machine according to the present invention is a sucker device for feeding stacked sheets one by one. And a feeder board, which is provided between the feeder board and the lower surface of the sheet, guides the sheet to the feeder board, and guides the air blown from the sucker device to the feeder board downward. Is. Therefore, the air blown to the lower side of the sheet is not guided to the feeder board side by the guide member but is guided below the guide member. Further, the sheet guiding device in the sheet feeding device of the printing machine according to the present invention is such that the upper surface of the guiding member is formed in an arc shape along the air blowing direction. Therefore, the air blown to the lower side of the sheet has a reduced flow velocity when passing through the central portion of the upper surface of the guide member, and a flow along the arc-shaped upper surface is generated. Further, the sheet guiding device in the sheet feeding device of the printing machine according to the present invention is such that the guide member has a hole penetrating downward. Therefore, the air staying on the lower side of the sheet is guided from the hole of the guide member to the lower side of the guide member and the floating of the sheet is corrected, so that the sheet sticks to the feeder board. The guide member guides the feeder board.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a main part of a sheet guide device in a sheet feeding device of a printing machine according to the present invention, and FIG. 2 is a perspective view showing the whole guide plate. In these figures, the same or equivalent members described in the prior art shown in FIGS. 3 and 4 described above are designated by the same reference numerals, and detailed description thereof will be omitted.

The feature of the present invention is that the front end portion 23a and the rear end portion 23b of the guide plate 23 attached to the holder 22a are lowered by a screw (not shown) inserted into a hole 23c formed in the central portion. It is a point that is curved to form an arc shape in a side view. By doing so, the paper 1
In addition to the function of guiding 0 to the feeder board 24, air flowing from the sucker device 4 to the feeder board 24 side below the paper 10 is guided to the lower side of the guide plate 23 from the gap 25 formed behind the rear end portion 23b. And release it,
It also has the function of controlling the floating of the paper.

That is, as in the above-mentioned conventional technique, the uppermost paper 10 is moved by the sucker device 4 to the paper feed roller 14.
When the paper is fed between the paper feed roller 17 and the paper feed roller 17,
An air flow is generated below 0 toward the feeder board 24. This air flows along the upper surface of the guide plate 23, and when flowing over the rear end portion 23b, the rear end portion 23b is curved downward, so that the flow velocity decreases and
In addition to the flow toward the feeder board 24 side, a flow along the curved rear end portion 23b occurs.

Due to the decrease in the flow velocity of the air in this way, it becomes difficult for the air to pass through the narrow gap between the paper regulating portion 19a of the paper regulating guide bar 19 and the front end of the feeder board 24, and moreover along the rear end portion 23b. Due to the flow, most of the air is guided downward (in the direction indicated by A in the figure) from the gap 25 formed between the rear end portion 23b and the feeder board 24. Therefore, the air flowing below the paper 10 is removed on the upstream side of the feeder board 24, so that the paper 10 is prevented from floating up over almost the entire area.

Therefore, the paper 10 is guided to the feeder board 24 so as to be in close contact with the guide plate 23, so that the paper 10 guided to the feeder board 24 is conveyed on the feeder board 24 by the conveyor belt 30 and the guide rollers 32. And are conveyed so as to be in close contact with the feeder board 24. Since the paper 10 is conveyed so as to be in close contact with the feeder board 24, the paper 10 whose front end is aligned with the front plate of the difference plate
Can be securely gripped by the claws of the swing device, and therefore, it is possible to prevent the occurrence of a paper jam and the failure of the printing machine without damaging the grip. Further, the paper 10 that is gripped by the swing device from the claw of the swing device to the claw of the pressure drum
Since wrinkles do not occur in the sheet, it is possible to prevent printing defects such as double marks. Further, since the guide plate 23 can be curved and formed from a single flat plate material, the manufacture becomes easy.

In the present embodiment, the guide plate 23 is formed in an arcuate shape when viewed from the side, but the shape is not limited to this and may be, for example, a so-called wing shape in fluid dynamics. Further, the guide plate 23 may be formed as a flat plate and bent so that the tip end portion is inclined downward. In that case, since the flat plate-shaped guide plate 23 may be bent, the work is facilitated. Further, a large number of holes penetrating downward may be formed in the guide plate 23, and air may be guided downward through these holes. In that case, the guide plate 23 does not necessarily have to be formed in an arc shape in plan view. Instead, it may be flat.

Further, in the present embodiment, the air is guided downward mainly through the gap 25 from the rear end 23b of the guide plate 23, but by forming the paper feed roller 14 in a small width, Air can be guided downward through the gap 13 formed on the front end portion 23a side of the guide plate 23.
That is, a part of the air blown from the sheet feeding device side hits the front end portion 23a which is curved downward and is guided downward from the gap 13 side. By doing so, the lifting of the paper 10 is more effectively performed. Can be stopped.

[0018]

As described above, according to the present invention, it is positioned between the feeder board and the sucker device for feeding the stacked sheets one by one, and supports the lower surface of the sheets. By providing a guide member for guiding the sheet to the feeder board and guiding the air blown from the sucker device to the feeder board side, the air blown from the sucker device side to the lower side of the sheet is guided. The sheet is guided not to the feeder board side but to the lower side of the guide member, so that the sheet is prevented from rising upward, and the sheet is guided in close contact with the guide member. For this reason, the sheet guided by the guide member to the feeder board is conveyed so as to be in close contact with the feeder board. It can be gripped securely, and therefore, it is possible to prevent the occurrence of paper jam and the failure of the printing machine without damaging the grip.
In addition, wrinkles do not occur on the paper that is gripped by the claws of the swing device to the claws of the impression cylinder and adheres closely to the peripheral surface of the impression cylinder. Is improved.

According to the present invention, since the upper surface of the guide member is formed in an arc shape along the air blowing direction, the air blown downward from the sheet feeding device side to the sheet is on the upper surface of the guide member. Since the sheet is guided below the guide member, the sheet is prevented from rising upward, and the sheet is guided in close contact with the guide member. For this reason, it is possible to prevent the occurrence of a paper jam and the failure of the printing machine without causing the gripping loss, and it is possible to prevent the occurrence of a printing defect such as a double print, thereby improving the printing quality. Further, the guide member only needs to be formed by bending one plate member, which facilitates manufacturing,
Manufacturing costs are reduced.

Further, according to the present invention, since the guide member is provided with the hole penetrating downward, the air that has conventionally stayed below the sheet is removed, so that the sheet moves upward. Of the sheet is prevented, and the sheet is guided in close contact with the guide member. For this reason, it is possible to prevent the occurrence of a paper jam and the failure of the printing machine without causing the gripping loss, and it is possible to prevent the occurrence of a printing defect such as a double print, thereby improving the printing quality.

[Brief description of drawings]

FIG. 1 is a side view showing a main part of a sheet guide device of a printing machine according to the present invention.

FIG. 2 is a perspective view showing the entire guide plate of the sheet guide device of the printing machine according to the present invention.

FIG. 3 is a side view of a sheet guide device of a conventional printing machine.

FIG. 4A is a side view showing a main part of a sheet guide device of a conventional printing machine, and FIG. 4B is a view on arrow IVb in FIG.

[Explanation of symbols]

1 ... Sheet guide device, 4 ... Sucker device, 7 ... Blowing foot, 1
0 ... paper, 23 ... guide plate, 24 ... feeder board, 25
... Gap, 30 ... Conveyor belt.

Claims (3)

[Claims] 1. A sucker which is located between a sucker device for feeding stacked sheets one by one and a feeder board, supports the lower surface of the sheet and guides the sheet to the feeder board, and a sucker A sheet guiding device in a sheet feeding device of a printing machine, comprising a guide member for guiding downward air blown from the device to the feeder board side. 2. The sheet guide device in the sheet feeding device of the printing machine according to claim 1, wherein the upper surface of the guide member is formed in an arc shape along the air blowing direction. Sheet guide device in paper machine. 3. The sheet guiding apparatus for a sheet feeding device of a printing machine according to claim 1, wherein the guide member is provided with a downwardly penetrating hole. Paper guide device.