JPH058288Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paper conveying device for conveying printed paper in a sheet-fed rotary printing press for ejection.

[Conventional technology]

A sheet-fed rotary printing press is equipped with a paper transport device that receives paper printed by a printing unit from a printing cylinder and transports it to a paper discharge position. FIG. 1 is a schematic side view of a conventional paper conveying device. This will be explained based on this figure. An impression cylinder 1 of a printing unit is opposed to a paper discharge cylinder 2 having the same diameter as the impression cylinder 1. A pair of left and right sprockets 3 are coaxially mounted on the paper discharge cylinder 2 in close proximity to left and right paper discharge frames 4, respectively. Also, a pair of left and right sprockets 5 are provided at the rear end of the paper ejection frame 4, and a paper ejection chain 6 is stretched between the sprockets 3 and 5, respectively. A pawl shaft 7 and a pawl base shaft 8 are disposed between the left and right paper ejection chains 6, which run in the direction shown by arrow A in the figure as the sprockets 3 and 5 rotate.
A plurality of sets of nail rods consisting of are supported at regular intervals, and on each nail shaft 7 and nail base shaft 8, a nail 9 and a nail base 10 are arranged in parallel in correspondence with each other. ,
A paper gripping device 1 includes these nail rods, nails 9, and nail stands 10.
1 is configured. The claw 9 of the paper gripping device 11 is opened and closed by a cam mechanism to transport the paper 12 between the gripper 10 and the paper 12 that is released from the grip and falls below the end of the transport. A paper stacking table 13 is provided.

In the paper conveyance device configured in this way,
As the paper discharge chain 6 runs, the paper gripping device 11
When one set of paper 12 enters the contact area between the impression cylinder 1 and the paper discharge cylinder 2 rotating in the directions shown by arrows B and C in the figure from above and faces the paper gripping device of the impression cylinder 1, the paper 12
The paper 12 is transferred to the paper delivery cylinder 2.
After being conveyed obliquely upward while attached to the circumferential surface of the object, it is further conveyed horizontally and released from the grip.

In such paper conveyance and paper ejection operations, in order to improve the alignment of the sheets 12 stacked on the paper stacking table 13, it is desirable to slow down the conveyance speed of the paper 12, so as is clear in the figure. , while the paper discharge cylinder 2 has the same diameter as the impression cylinder 1, the reference circle diameter of the coaxial sprocket 3 is made 10 to 30% smaller than the diameter of the paper discharge cylinder 2, and the traveling trajectory of the toe holding the paper 12 in its mouth is determined. The diameter is the same as that of the paper discharge cylinder 2. By doing this, the traveling speed of the paper 12 when it is transferred from the claw of the impression cylinder 1 to the paper gripping device 11 is the same as the printing speed, and while the paper 12 is being wound around the paper delivery cylinder 2, However, when the paper gripping device 11 enters linear motion, the speed of the gripping end of the paper 12 is reduced to the same speed as the paper discharge chain 6. However, the second half of the paper 12 has a moment of inertia at high speed and tends to be conveyed at that speed, so this effect causes the paper 12 to flap as shown in FIG. Furthermore, in a high-pile type paper discharge device in which paper 12 is piled up high, when the paper discharge chain 6 travels diagonally upward and shifts to horizontal movement, the paper gripping device 11 moves in a circular arc opposite to that at the paper discharge cylinder position. Since the running speed of the toe that moves and holds the paper 12 in its mouth is reduced, the paper 12
It flutters. Such so-called paper fraying at two locations causes stains and scratches on the printed surface of the paper 12, and the alignment of the paper on the paper stacking table 13 deteriorates significantly.

[Problem that the invention attempts to solve]

Conventionally, air is used to suction the paper 12 to stabilize it, or negative pressure generated by blowing air is used to stabilize the paper 12.
Techniques for stabilizing the paper 12 have been proposed, but all of them have the disadvantage that the paper 12 comes into contact with a member that sucks or blows air and is damaged. In order to avoid this, some products are equipped with paper guide rods, but
It was not possible to eliminate the rubbing of the paper 12.

[Means for solving problems]

The present invention was developed in view of the above points, and includes a paper receiving plate that extends in a series along the travel path of paper transported by a paper discharge chain, and is connected to an air source using an air supply pipe. At least two stages of air blowing slits, upper and lower, for generating negative pressure are provided so that the wind direction is oriented toward the end of the paper.The uppermost slit is positioned at the upper end of the rising edge of the paper, and the lower sprocket is positioned horizontally at both ends of the paper width. The present invention provides a paper conveying device which is divided into a plurality of openings in the single paper receiving plate so as to include the paper receiving plate.

[Effect]

The air blown out from the slit creates negative pressure on the underside of the printing paper, and an air layer is formed between the back of the printing paper and the paper receiving plate, so the printing paper does not come into contact with the paper receiving plate. I'm drawn to it.

〔Example〕

2 to 4 show an embodiment of the paper transport device according to the present invention. FIG. 2 is a side view of a printing press paper delivery device in which the embodiment is implemented. FIG. 3 is a cross-sectional view of the paper receiving plate and an enlarged cross-sectional view of the main part. FIG. 4 is a cross-sectional view of the paper receiving plate.
1 is a front view of the left half of the device.
The same components as those in Fig. 1 are designated by the same reference numerals and therefore will not be described. An air blower 21 is provided between the delivery drum 2 and the pile table 13 as an air source, and an air supply pipe 22 extending upward is connected to the exhaust port. The component generally designated by the reference numeral 23 is a paper receiving plate formed in a gentle arc shape along the paper transport path of the delivery chain 6 and with a width approximately equal to the chain spacing dimension, and is fixed to a frame (not shown).
The air supply pipe 22 extends obliquely downward from the rising upper end of the paper delivery chain 6 along the paper delivery chain 6. That is, the air supply pipe 22 branches into a total of six pipes, three in the vertical direction and two in the horizontal direction, which is the paper width direction, and the tip of each branch pipe is connected to box-shaped air blowing boxes 24, 25, and 26, which are welded to the paper receiving plate 23 in three rows and two rows.
The uppermost air blowing box 24 of the 5 and 26 is located at the top end of the paper discharge chain 6, and has a slit 27 that directs the air toward the tail end of the paper 12 being transported. The air blowing boxes 25 and 26 are located at the center and top end of the paper discharge chain 6, and have slits 28 and 29 that are formed by cutting the paper receiving plate 23 into a U-shape and punching it out toward the back side, and direct the air toward the tail end. In particular, the slits 28 and 29 are elongated slits 28a and 29a that are located below the surface of the paper receiving plate 23 and open along the surface to direct the air upstream, as shown in Figures 3 and 4.
and inclined grooves 28b, 29b which are connected to the slits and open widely in the direction perpendicular to the surface. Therefore, there is no step between the upstream side and the downstream side of the slits 28, 29.
These three slits 27, 28, 29 are provided corresponding to the left and right air blowing boxes, respectively, and are divided in the paper width direction, and in this embodiment for a full-sized chrysanthemum printing plate, their left and right outer ends are positioned to include a line about 150 mm inward from both end edges of the paper receiving plate 23 so as to accommodate the largest paper. The dashed line L indicates the center line of the paper receiving plate 23 in the width direction.

Reference numerals 30 and 31 indicate seats for fixing the paper receiving plate 23 to a frame (not shown), and there are six seats in total, two rows up and down and three rows left and right.
As shown in FIG. 4, this paper receiving plate 23 has no openings other than the slits 27, 28, and 29, and is formed in series from a single sheet metal.

The operation of the paper conveyance device configured as above will be explained. As the paper discharge chain 6 travels, one set of paper gripping devices 11 enters from above into the contact area between the impression cylinder 1 and the paper discharge cylinder 2, which rotate in the directions shown by arrows B and C in the figure, and presses the impression cylinder 1. When facing the paper gripping device,
The paper 12 is replaced, and the paper ejection chain 6
The paper 12 held in the paper holding device 11 is conveyed obliquely upward along the rising portion by the running of the paper discharge chain 6. This paper 12 runs along the paper receiving plate 23 in the latter half of the rise, but between this paper 12 and the paper receiving plate 23, each slit 2
Since air is blown from 7, 28, and 29 as shown by the arrows in FIG. However, since there is an air layer there, paper 1
2 does not come into contact with the paper receiving plate 23. By being conveyed in this manner, the paper 12 is conveyed with the slack stretched out without flapping or coming into contact with the paper receiving plate 23, and is released from the paper gripping device 11 at the end of conveyance. and stacked on the paper stacking table 13. In this case, if the sizes of the slits 27, 28, and 29 are adjusted to make the wind force from the central slits 28 and 29 stronger than the wind force from the upper end slit 27, the paper 12 can be completely covered with air. Even without blowing, the slack is removed and the product is transported in the correct posture.

In this embodiment, an example is shown in which three stages of slits are provided, but if the paper size is small, two stages may be used.In this case, the wind force from the lower stage slits is made stronger than that from the upper stage. Further, if the paper size is large, four or more stages may be provided, and in this case, the wind force at the second stage from the top and below is made weaker than in the case of three stages because the number of stages is increased. In addition, in this embodiment, the slit 2
7, 28, 29 are divided into two in the paper width direction, but they may be divided into three or more rows. In this case, when the paper size is small, the outer slits 27, 2
All you have to do is turn off the air blowing from 8 and 29.

[Effect of idea]

As is clear from the above description, according to the present invention, in a paper conveying device of a sheet-fed rotary printing press, a paper receiving plate extending along the conveying path of paper conveyed by a paper discharge chain is provided, and the paper receiving plate At the top, there are at least two upper and lower sections divided in the width direction of the paper so as to include both ends of the paper width.
By opening the air blowing slit for generating negative pressure in the stage so that the wind direction is directed toward the paper tail, the conveyance speed of the paper will be different between the gripping edge and the paper tail, which will cause the paper to sag or flap. The air from the slit and the resulting negative pressure pull the paper toward the edge of the paper and stretch it to the extent that it does not touch the paper receiving plate, which eliminates stains and scratches on the paper and improves the quality of printed matter. be able to. Furthermore, the edges of the stacked papers are aligned well after they are discharged, eliminating the need for subsequent paper alignment, improving work efficiency and increasing the speed of the machine. In addition to improving paper stability and paper alignment, especially when the paper stacking position is high,
Since blowing air from a divided slit has the same effect as blowing air from a long undivided slit, the air supply device can be made smaller and provided at a lower cost.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a conventional paper conveying device for a sheet-fed rotary printing press, and FIGS. 2 to 4 show an embodiment of the paper conveying device for a sheet-fed rotary printing press according to the present invention. 3 is a sectional view of the paper receiving plate and an enlarged sectional view of its essential parts. FIG. 4 is the left half of the paper receiving plate when viewed from D in Fig. 2. FIG. 6... Paper discharge chain, 12... Paper, 21... Air blower, 22... Air supply pipe, 23... Paper receiving plate,
27, 28, 29...slit.

Claims (1)

[Scope of utility model registration request] A paper receiving plate 23 is provided that extends in series along the running path of the paper 12 conveyed by the paper discharge chain 6, and at least one paper receiving plate 23 is connected to the air source 21 by an air supply pipe 22 so that the wind direction is directed toward the paper trailing edge. Air blowing slits 27 and 28 for generating negative pressure are provided in upper and lower two stages, the uppermost slit 27 is positioned at the upper end of the rising edge of paper discharge, and the lower slit 28 is divided into a plurality of slits in the left-right direction so as to include both ends of the paper width. The lower slit 28 is opened in the paper receiving plate 23.
The slit 28a is located below the surface of the paper receiving plate 23 and opens toward the end of the paper. A paper conveyance device for a sheet-fed rotary printing press, characterized in that it is formed by a stamped inclined groove 28b.