JPH0230986B2 - RYOMENSATSUMAIYOR INTENINSATSUKINOHAISHISOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a paper discharge device for conveying printed paper and discharging it onto a paper stacking table in a double-sided sheet-fed rotary printing press.

[Prior art]

In a sheet-fed rotary press, the paper printed by the printing unit is transferred from the impression cylinder's claws to the paper ejection chain's claws, and at the end of the conveyance, it is released from the claws and falls, and then is loaded onto the paper stacking table. be done. Since the paper conveyed in this type of conveyance device is only held at the leading end by the claws, the tail of the paper may flap, or when the paper is released from the claws, inertia may remain, causing the stacking. Sometimes, the edges of the paper are not aligned, so in order to prevent this, a pair of suction wheels are installed in parallel in the width direction of the paper near the end of the conveyance. The running of the paper is slowed down by attaching the paper.

However, this suction wheel is good if the printing press is single-sided printing, but if it is installed in a double-sided printing press, the printing surface will come into sliding contact with the suction wheel, so if the width of the non-printing area is narrower than the width of the suction wheel, it will not work. The printed surface often gets dirty or scratched, resulting in a decline in the quality of the printed material and waste paper. In such cases, conventional methods have been to suck air from the suction wheel and switch to blow-up mode, but this degrades the paper deceleration function and greatly impairs paper alignment when ejecting the paper. However, it is unavoidable to slow down the operating speed of the machine, which not only significantly reduces productivity, but also makes it impossible to properly control the air other than the suction wheel, which often causes work to be interrupted due to poor paper ejection. There was something I had to do.

[Summary of the invention]

The present invention has been made in view of the above points, and includes a ring made of an elastic material, which is removably fitted into an annular groove provided on the circumferential surface of a suction wheel.
By configuring a part of the ring to protrude from the circumferential surface of the suction wheel when it is fitted, the non-printing part facing the circumferential surface of the suction wheel can handle double-sided printing paper whose width is smaller than the width of the suction wheel. A paper ejection device for double-sided sheet-fed rotary printing presses that prevents contact with the surrounding surface of the suction wheel, enables high-speed operation, prevents dirt and scratches, and improves productivity and reduces the amount of paper waste. It provides: Embodiments of the present invention will be described in detail below with reference to the drawings.

[Embodiment] Figures 1 to 5 show an embodiment of the paper discharge device according to the present invention, in which Figure 1 is a schematic side view, Figure 2 is a plan view of the vicinity of the suction wheel, and Figure 3 is a ring A cross-sectional view of the outer periphery of the suction wheel shown to explain the reversing operation of
Figure 4 is a cross-sectional view of the same location as in Figure 2, and Figure 5 is a cross-sectional view along AA of Figure 2. In the figure, a paper discharge device 1 of a printing press is equipped with a pair of left and right paper discharge frames 2 connected to a printing unit, and a pair of left and right sprockets 4 are attached to a sprocket shaft 3 pivotally supported at the front end of a horizontal member. It is attached to the shaft. A pair of left and right paper discharge chains 6 running in the direction shown by arrow B in the figure are stretched between the sprockets 5 for changing the direction of the left and right sprockets 4 and the sprockets of a printing unit (not shown). Between the left and right paper ejection chains 6, gripping claw devices (hereinafter referred to as "claws") 7, which consist of a claw shaft, a claw stand shaft, and claws and claw stands arranged in parallel on both shafts, are arranged at regular intervals. Multiple sets are provided. This pawl 7 picks up the printed paper 8 from a pawl provided on the impression cylinder of the printing unit, conveys it as the paper discharge chain 6 runs, and abuts a cam (not shown) near the sprocket 4. It is configured to open and release the paper 8 from the grip. A paper stacking table 9 that can be raised and lowered is provided below the conveyance end of the paper discharging chain 6 and is supported by the paper discharging frame 2 side. Paper 8 released from and falling
is loaded. The paper stacking table 9 is configured to automatically descend according to the amount of paper 8 loaded.

In front of the falling path of the paper 8 in such a paper ejecting device 1, a pair of left and right front guards 11 are provided to abut and align the front ends of the papers 8 to be dropped and stacked, and behind them, A pair of left and right side shifting plates 12 are provided to bring the side edges of the falling papers 8 into contact and reciprocate in the paper width direction to align the edges of the papers when stacked. Furthermore, a suction device 13, which is shown in detail in FIGS. 2 to 5, is provided behind the side plate 12. That is, in front of the stay 14 that connects the left and right paper discharge frames 2, a drive shaft 15 that is parallel to the stay 14 and rotates by being driven from the driving side is pivotally supported by the left and right paper discharge frames 2. Reference numeral 16 denotes a pair of left and right air ducts, which are fitted into a flanged bush 17 that is slidably fitted onto the drive shaft 15, and whose rear U-shaped portion is engaged with the stay 14. Rotation is regulated by matching. And the bush 17 has a bolt 18 screwed into its flange.
The movement in the axial direction is adjusted by loosening the bushing 1, and after adjustment, the set screw 18 is tightened to remove the synthetic resin bush 1.
By pressing the drive shaft 9 against the drive shaft 15, the drive shaft 9 can be positioned and fixed at any desired location.
On the bush 17, a liner 20 and a suction wheel 24, which will be described later, are fitted on both sides of the air duct 16, and a thrust ring 21 is interposed between the liner 20 and the air duct 16. The liner 20 is prevented from coming off the bush 17 by a snap spring 22. Further, a wave washer 23 having a resilient force for pressing the suction wheel 24 toward the air duct 16 is interposed between the suction wheel 24 and the flange of the bush 17.

The suction wheel 24 is integrally formed with a boss portion having approximately the same diameter as the circular arc portion of the air duct 16 and a suction portion having a slightly larger diameter.
An annular air passage 25 that opens to the side surface on the 6 side is provided. In addition, there is an air passage 2 on the circumference of the suction part.
A plurality of intake holes 26 are provided in two rows in parallel in the width direction, and are arranged in parallel in the circumferential direction and communicate between the air intake hole 5 and the outside. Further, on the circumferential surface of the central part in the width direction of the suction part, there is an annular groove 2 having a convex cross-sectional shape that is narrower on the axis side.
7 is provided. The reference numeral 28 is a dirt prevention ring formed in an annular shape with a convex cross section, which is suitable for rubber as an elastic material.
7, and due to its elasticity, the annular groove 27
It can be attached to and detached from the body, and the narrow side is the inner circumferential side as shown in Figure 3a, and the narrow side is the inner peripheral side as shown in Figure 3b.
It is configured so that it can be reversed to a state where the narrow side is the outer peripheral side as shown in FIG. In other words, Figure 3a
In the state shown in , the narrow part of the ring 28 is in the annular groove 27
The ring 28 is engaged in the narrow width portion of the ring 28 so that the peripheral surface of the suction wheel 24 becomes flat, and the small diameter portion of the ring 28 protrudes from the peripheral surface of the suction wheel 24 in the state shown in FIG.

On the other hand, the air duct 16 is provided with a Z-shaped air passage 29 that opens toward the side surface on the side of the suction wheel 24 and communicates the annular air passage 25 with the outside below the stay 14. One end of a hose 31 is connected to an air intake source (not shown), and the other end of the hose 31 is attached to the inserted hose port 30 . In addition,
The suction wheel 24 is crimped to the air duct 16 by a wave washer 23 and fixed to the bush 17 by a set screw 32, and its rotational speed is set so that its circumferential speed is slightly slower than the conveyance speed of the paper 8. It is set.

The operation of the paper ejecting device configured as above will be explained. The paper 8 printed by the printing unit is transferred from the claw of the impression cylinder to the claw 7 of the paper delivery chain 6, and is conveyed by the paper delivery chain 6 running in the direction of arrow B. The gripping end of the paper 8 being conveyed is the suction device 13
After passing above, the non-holding part of the paper 8 comes into sliding contact with the suction wheel 24, and outside air is sucked from the suction hole 26 of the suction wheel 24 by the suction source via the hose 31 and the air passages 29, 25. Therefore, paper 8 is suction wheel 2
Since the circumferential speed of the suction wheel 24 is slightly slower than the conveyance speed of the paper 8, the speed of the suction portion of the paper 8 is reduced compared to the speed of the end of the paper 8 being held in the mouth. Therefore, the paper 8 is slightly pulled backward and becomes tense, and at the same time as the tail of the paper leaves the suction wheel 24, it is released from the grip of the claw 7 and falls. The paper 8 is conveyed by the claws 7 and decelerated by the suction wheel 24 so that it falls diagonally forward while being given appropriate running inertia, so that the front end contacts the front pad 11 and is aligned in the vertical direction.
Further, the sheets are stacked on the paper stacking board 10 while being aligned in the width direction by the side shifting board 12.

In a paper ejecting device that operates in this manner, when the printed matter is single-sided printed, or double-sided printed, and the width of the non-printing margin on the printed surface that becomes the lower surface during transportation is wider than the suction part width of the suction wheel 24, As shown in FIG. 3a, after fitting the ring 28 into the annular groove 27 with the narrow width facing toward the inner circumference, loosen the set screw 18 and position the suction device 13 according to the paper size. Since the circumferential surface of the suction wheel 24 becomes flat by performing the above-mentioned operation, a good suction effect can be exerted as in the case without the ring 28.

In addition, if the printed matter is double-sided printing and the width of the non-printing margin on the printing surface on the suction wheel 24 side is narrower than the width of the suction wheel 24, the ring 2
8 is inserted into the annular groove 27 so that the narrow side becomes the outer circumferential side, and then the suction device 13 is positioned and the suction wheel is placed on the printing surface of the paper 8 other than the portion where it slides into contact with the narrow width portion of the ring 28. 24, so if the suction device 13 is positioned so that the narrow portion corresponds to the non-printing margin, the printed surface will not be stained or damaged. Although the suction effect is slightly lower than that shown in FIG. 3a, it is still sufficient to decelerate the paper 8.

In this embodiment, the annular groove 27 is formed to have a convex cross section, and the narrow part of the ring 28 is connected to the suction wheel 24.
An example has been shown in which the ring 28 is inverted and housed in the annular groove 27 when the ring 28 is not to protrude from the circumferential surface of the suction wheel 24. It may also be left loose on the drive shaft 15 or the boss portion of the suction wheel 24. In this case, the annular groove 27
It is not necessary to have a convex cross section, but a rectangular cross section is sufficient. Further, the ring 28 and the annular groove 27 do not necessarily have to have a convex or rectangular cross-sectional shape.
As long as a portion of the ring 28 protrudes from the circumferential surface of the suction wheel 24 when fitted, a ring with a circular cross section and an annular groove with a semicircular cross section may be provided, for example.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in the paper discharge device of a double-sided sheet-fed rotary printing press,
A ring formed in an annular shape made of elastic material is provided, and when the width of the non-printing area is smaller than the width of the suction wheel in double-sided printing, this ring is fitted into the annular groove provided on the circumference of the suction wheel to suck a part of it. By configuring it to protrude from the circumferential surface of the car, in the case of such printed matter, the printed part of the printed matter is separated from the circumferential surface of the suction wheel without having to switch the suction wheel to blow up, thereby preventing stains and scratches on the printed matter. This improves the quality of printed matter and reduces the amount of waste paper generated.In addition, by being able to work in suction mode, the suction wheel can reduce the speed and reduce the speed when paper is ejected without having to operate at low speed. Since the paper alignment function can be secured, speeding up is possible and productivity is significantly improved. Furthermore, in the case of single-sided printed matter or double-sided printed matter with a large non-printing area, the printed matter can be brought into close contact with the circumferential surface of the suction wheel by simply removing the ring, inverting it, and storing it in the annular groove. This makes it possible to further improve the deceleration function, and also to reduce the labor required when switching between printed materials.

[Brief explanation of drawings]

1 to 5 show an embodiment of a sheet discharge device for a double-sided sheet-fed rotary printing press according to the present invention, FIG. 1 is a schematic side view thereof, FIG. 2 is a plan view near the suction wheel,
Fig. 3 is a cross-sectional view of the outer circumference of the suction wheel shown to explain the reversing operation of the ring, Fig. 4 is a cross-sectional view of the same location as Fig. 2, and Fig. 5 is a cross-sectional view along AA of Fig. 2. . 1... Paper discharge device, 8... Paper, 24... Suction wheel,
27... annular groove, 28... ring.

Claims (1)

[Claims] 1. An annular groove is provided on the circumferential surface of a suction wheel disposed in the paper conveyance path, and a ring formed in an annular shape made of an elastic material is partially protruded from the circumferential surface of the suction wheel so that it can be freely attached to and detached from the annular groove. A sheet discharge device for a double-sided sheet-fed rotary printing press, characterized in that the sheet-fed rotary printing press is fitted with a double-sided sheet-fed rotary printing press.