JP2000103558A - Sheetlike article carrying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the printing quality by suppressing generation of traces caused by damages and scrapes. SOLUTION: A paper sheet 11 whose starting end is bitten by a biting claw device 8 is carried in the direction of an arrow A by traveling a paper discharge chain 7. A guide plate 18 is provided below the paper discharge chain 7, and a guide rod 19 corresponding to a non-printing area of the paper is provided between the guide plate 18 and the paper discharge chain 7. An air nozzle 30 directed approximately parallel to the traveling direction A in a direction opposite to the traveling direction A of the paper sheet 11 is provided opposite to the guide plate 18 across the paper discharge chain 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying apparatus for conveying a sheet printed at a sheet discharge section of a sheet-fed rotary printing press.

[0002]

2. Description of the Related Art A sheet-fed rotary printing press is provided with a paper discharging device for receiving paper printed by a printing unit from a printing cylinder, transporting the paper to a paper discharging position, and discharging the paper onto a paper stacking platform. The paper ejection device is provided with a paper ejection cylinder that is in contact with the impression cylinder of the printing unit and has the same diameter as the impression cylinder, and is coaxial with the ejection cylinder.
A pair of left and right sprockets are pivotally mounted close to the left and right discharge frames. A pair of left and right sprockets is also provided at the front end of the discharge frame, and a pair of right and left discharge chains are stretched between the front and rear sprockets.

[0003] A plurality of sets of claw rods each consisting of a claw shaft and a claw base shaft are supported at regular intervals between these left and right paper discharge chains. Are arranged in the axial direction so as to correspond to each other, and the claw and the claw base constitute a holding claw device. The pawls of the gripper device carry the paper together with the pawl base, and a paper platform for loading the paper that is released from the grip by the cam mechanism and falls is provided below the transport end. In the sheet discharging device of the sheet-fed rotary printing press configured as described above, a guide plate is provided below the sheet discharging chain along the sheet discharging chain. The guide plate is formed of an iron plate and is provided so as to extend between the left and right discharge chains.

[0004]

In the above-mentioned conventional sheet conveying apparatus, when the double-sided printed paper is conveyed, the printed back side slides on the guide plate, and the sheet is scratched or rubbed. Traces occur. In order to prevent this, a plurality of guide rods are provided between the guide plate and the paper to be conveyed so as to correspond to the non-image area on the back side of the printed paper. By receiving the paper, the printing surface on the back side of the paper does not slide on the guide plate. However, when there are few non-image areas,
Since the distance between the guide rods is increased, not only the paper receiving by the guide rods becomes unstable, but also the paper is loosened between the guide rods. For this reason, the slack portion sometimes comes into sliding contact with the guide plate, and the trace due to scratches or rubbing could not be completely eliminated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a sheet conveying apparatus which suppresses the generation of traces due to scratches and rubs and improves print quality. Is to do.

[0006]

In order to achieve this object, a sheet conveying apparatus according to the present invention transfers a printed sheet to a holding claw device of a paper discharge cylinder and guides the sheet. A sheet conveying device that conveys a sheet-like object to a sheet discharging unit along a member, and air is provided in a direction substantially opposite to a conveying direction of the sheet-like material on a side opposite to the guide member with respect to a conveyance path of the sheet-like material. Is provided with an air discharge device that discharges air. Therefore, the air forms an air layer above the sheet-like material, and the sheet-like material is prevented from fluttering or loosening.

[0007]

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 schematically showing a sheet discharging section of a sheet-fed rotary printing press to which a sheet-like material transporting apparatus according to the present invention is applied, FIG. 2 is a side view of the same main part, and FIG. FIG. In FIG. 1, a reference numeral 1 generally designates a sheet discharge device of a sheet-fed rotary printing press. The sheet discharge device 1 includes a pair of left and right discharge frames 2 and 2 facing each other (one of which is shown in the drawing). ) To support the whole. Reference numeral 3 denotes an impression cylinder of a printing unit (not shown). A discharge cylinder 4 having the same diameter as the impression cylinder 3 is brought into contact with the impression cylinder 3, and a pair of right and left Sprockets 5 and 5 (one of the sprockets 5 is not shown) are pivotally mounted close to the left and right discharge frames 2 and 2.

Reference numeral 6 denotes a pair of left and right sprockets (one of the sprockets 6 is not shown) rotatably supported at the front ends of the paper discharge frames 2 and 2. A pair of left and right paper discharge chains 7, 7 are stretched between the five. As the sprockets 5 and 6 rotate, a claw shaft 9 and a claw base shaft 10 are provided between the left and right discharge chains 7, 7 traveling in the direction of arrow A in the figure.
Are supported at regular intervals in the running direction of the paper discharge chain 7.

On the claw shaft 9 and the claw base shaft 10, a plurality of claw and claw bases (not shown) are arranged in the axial direction so as to face each other to form a grip claw device 8. The claw of the holding claw device 8 is configured to be opened and closed by a cam mechanism (not shown) so as to carry the paper 11 as a sheet-like material between the claw base and the claw base. A paper platform 12 on which the paper 11 that is released from the grip and falls is provided.

In FIG. 2, reference numerals 14 and 15 denote upper and lower chain guides, and bolts 16 are attached to the left and right discharge frames 2 and 2 so as to face up and down via a plurality of fixing brackets.
Has been fixed by. These upper and lower chain guides 14 and 15 are configured to guide the traveling of the left and right discharge chains 7 and 7 in the direction of arrow A with the above-described discharge chain 7 interposed therebetween. Reference numeral 18 denotes a guide plate formed of an iron plate, and is provided below the discharge chain 7 along the discharge chain 7.

Reference numeral 19 denotes a guide rod, which is a paper discharge chain 7.
And the guide plate 18 are provided at positions corresponding to the non-image portions on the back surface of the double-sided printed paper, and in the width direction of the paper corresponding to the change in the position of the non-image portions. It is supported so as to be movable. Reference numeral 20 denotes a fan that blows air, and is positioned above the travel path of the paper discharge chain 7. Reference numeral 21 denotes a suction device which has been widely known from the past, and which is released from the grip of the gripper device 8 and
This is for reducing the conveying speed of the paper 11 falling to 2. Reference numeral 22 denotes a fan that blows air toward the suction device 21, and reference numeral 23 denotes a cover that is supported on the frame 2 via a hinge 24 so as to be freely opened and closed.

In the paper discharge device of the sheet-fed rotary printing press thus constructed, one set of the gripper devices 8 is rotated in the directions of arrows B and C in FIG. At a position where it comes in from above, where the drum 3 and the paper discharge drum 4 are in contact with each other, and faces the gripper device (not shown) of the impression cylinder 3,
The paper is changed. Paper 11 which was replaced
Is transported obliquely upward by the gripper device 8 traveling, and the back surface of the paper is guided while sliding on the guide rod 19. Thereafter, when the paper is conveyed above the paper stack 12, the claw 9 a of the gripper device 8 is opened by the cam mechanism (not shown), and the paper is stacked on the paper stack 12.

The above-described sheet discharging or stacking apparatus is not particularly different from the sheet discharging apparatus of a sheet-fed rotary printing press which has been widely used in the past. A feature of the present invention is that a number of air nozzles 30 are provided on the side opposite to the guide plate 18 with the paper discharge chain 7 interposed therebetween. That is,
As shown in FIG. 3, a support plate 25 is provided at a position on the opposite side to the guide plate 18 with the paper discharge chain 7 therebetween.
6 and attached to the left and right frames 2 and 2 by bolts 27. The support plate 25 is formed in a curved shape in a side view along the paper discharge chain 7 and has a width slightly smaller than the interval between the left and right paper discharge chains 7.

Five air tubes 28 extending in the width direction of the paper are fixed to the support plate 25 through metal fittings 29. One end of each air tube 28 has an air supply source (not shown). Is connected. The air pipe 28 is provided with a number of air nozzles 30 as an air discharge device, and is configured such that air from an air supply source is blown out of the air nozzles 30 through the air pipe 28. . As shown in FIG. 2, the air nozzles 30 are directed in a direction opposite to the traveling direction A of the paper discharge chain 7 and substantially parallel to the traveling direction A, and illustrations provided in the respective air pipes 28 are omitted. It is configured such that the amount of air 31 blown out by the adjusted valve can be adjusted.

Next, a description will be given of a paper conveying operation in the sheet discharging device of the sheet-fed rotary printing press having such a configuration. Air 31 is blown from the air nozzle 30 to the paper 11 which is gripped from the gripper device of the impression cylinder 3 to the gripper device 8 of the discharge chain 7 and conveyed obliquely upward. At this time, since the air nozzle 30 is oriented so as to be opposite to the traveling direction A of the discharge chain 7 and substantially parallel to the traveling direction A, the traveling direction A A layer of air flowing in the opposite direction is formed. Therefore, the paper 11 to be conveyed is prevented from fluttering by the layer of air, and the flapping of the trailing edge of the paper 11 is reduced. Further, since the paper bottom is pulled by the air 31 in the direction opposite to the arrow A, the entire paper 11 is tensioned, the flapping of the paper 11 is prevented, and the fluttering of the paper bottom of the paper 11 is reduced.

Further, since the air 31 is blown out in the direction opposite to the traveling direction A of the paper 11 and the upper part of the paper 11 is sealed by the support plate 25, the paper 11 and the support plate 2 are closed.
5, a state lower than the atmospheric pressure is formed, so that a negative pressure is generated and the paper 11 is conveyed so as to float. Therefore, the guide rod 19 of the paper 11 during conveyance is
Since the slack in the gap is corrected and the sliding contact with the guide plate 18 is prevented, the printed surface on the back surface of the paper 11 can be prevented from being scratched or rubbed.

In this embodiment, the air nozzle 30 is provided at the rising portion between the paper discharge cylinder 4 and the suction device 21. However, when a plurality of paper stackers 12 are provided in the paper transport direction, It may be provided between the paper stackers 12. Also, an example in which the sheet is conveyed to the paper 11 has been described, but any printable sheet may be used. Further, although the air nozzle 30 as the air discharge device is provided in the air pipe 28, a hole for air discharge may be provided in the air pipe 30 without providing the air nozzle 30.

[0018]

As described above, according to the present invention, it is possible to prevent the print surface on the back surface of the sheet-like material from being scratched or rubbed, thereby improving the print quality.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a sheet discharging unit of a sheet-fed rotary printing press to which a sheet-like material conveying apparatus according to the present invention is applied.

FIG. 2 is a side view of a main part of the sheet conveying apparatus according to the present invention.

FIG. 3 is a view taken in the direction of the arrow III in FIG. 2;

[Explanation of symbols]

Reference numeral 1 denotes a discharge section of a sheet-fed rotary printing press; 7 denotes a discharge chain;
Gripper device, 11: paper, 18: guide plate, 19: guide rod, 25: support plate, 30: air nozzle, 31: air.

Claims (1)

[Claims] 1. A sheet conveying apparatus for transferring a printed sheet to a holding claw device of a sheet discharging cylinder and conveying the sheet to a sheet discharging section along a guide member. An apparatus for conveying a sheet-like material, comprising an air discharge means for discharging air in a direction substantially opposite to a conveying direction of the sheet-like substance on a side opposite to the guide member with a path therebetween.