JP2000095409A - Sucking device in paper sheet rotary printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make paper arrangement favorable to improve quality by providing at least a pair of air discharging nozzles under a sheet-like object sandwiching the center in the width direction of the sheet-like object, and directing the air discharge direction from these nozzles outside the width direction of the sheet-like object between sucking devices. SOLUTION: Because the bent parts of respective nozzles from 50A to 50F are directed outside paper 20, air 60 discharged from the blowoff ports from the nozzles 50A to 50F acts on both end sides in the width direction of the paper 20 so as to pull each other. Consequently, because the paper 20 is tensed in the width direction to be flat, both end parts of the paper 20 are not detached from flat belts 13 positioned on both ends, and both end parts of the paper 20 are sucked with these flat belts 13. Consequently, carrying speed of the paper 20 can be sufficiently decelerated, the paper 20 is prevented from flapping, hence arrangement of the paper end does not become bad at loading the paper on a blanking plate 16, and because the paper does not contact with brackets 9, the printing surface is not injured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-fed rotary printing machine provided in a sheet discharge device of a sheet-fed rotary printing press for reducing the speed of a sheet by sucking a sheet while sliding the sheet. The suction device in the machine.

[0002]

2. Description of the Related Art In a sheet-fed rotary printing press, paper printed by a printing unit is conveyed by being changed from a claw of an impression cylinder to a claw of a discharge chain, and a grip by a claw at a peripheral end of the conveyance is released. Is dropped and loaded on a paper platform. In such a paper ejection device, the paper to be conveyed is merely held at its tip by a nail, so that when the paper butt flutters or when the paper is released from the held state and falls, the traveling inertia increases. And the paper edges may not be aligned during loading. In order to prevent this, a plurality of suction wheels provided with a suction surface near the transport end portion are arranged side by side in the width direction of the paper, and the paper released from the holding state of the claws is adsorbed on the peripheral surface, whereby the paper is removed. It has been practiced to decelerate the running of the car. This suction device is provided with a suction wheel that rotates at a peripheral speed lower than the transport speed of the printing paper on the upstream side in the paper discharging direction of the paper discharging device,
A suction surface which is connected to a suction air source and suctions the paper while sliding the paper is provided on a peripheral surface of the suction wheel. When this suction device is used in a two-sided printing machine, if the suction wheel is positioned within a pattern printed on the back of the paper, the suction surface of the suction wheel will damage the image area printed on the paper and cause the printing to fail. Due to the reduced quality, it was necessary to position the suction wheel in the non-image area where no printing was performed.

[0003]

However, when the number of non-image areas is small, the number of suction wheels is limited.
In addition, since the width of the non-image area is small, the width of the suction wheel cannot be made sufficiently large, so that the central portion of the paper sags between the suction wheels, that is, a so-called curling occurs. If this occurs, both ends of the paper will come off the suction wheel, so the paper transport speed cannot be reduced sufficiently, and the paper will flutter. There was a problem that the printing surface was damaged due to contact with the bracket of the car.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to improve the quality of a sheet-fed rotary printing press while improving the sheet alignment in a sheet discharging device. To provide a suction device.

[0005]

In order to achieve the above object, according to the present invention, there is provided a sheet discharging device for discharging a sheet-like material, and the sheet-like material upstream of the sheet discharging device in a sheet discharging direction. The suction device in a sheet-fed rotary printing press provided with a plurality of suction surfaces provided on a lower side in a width direction of the sheet-like material and connected to a suction air source and suctioning the sheet-like material while sliding the sheet-like material, Below the sheet-like material, at least one pair of nozzles for discharging air that blows up the sheet-like material upwards are provided on both sides of the sheet-like material across the center in the width direction, and the direction of air discharge from these nozzles is between the suction devices. In addition, the sheet is directed outward in the width direction of the sheet. Therefore, the sheet-shaped material is straightened by the air from below, and the air is blown obliquely upward, so that the sheet-shaped material is uniformly lifted without being partially lifted by the air, and the sheet-shaped material is lifted uniformly. The sheet is flattened, and both ends of the sheet are pulled outward in the width direction, so that the sheet is taut.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a suction device in a sheet-fed rotary printing press according to the present invention, FIG.
3 is a sectional view taken along the line III-III in FIG. 1, and FIG.
FIG. 4 is a sectional view taken along line IV-IV. 1 and 2 are divided into left and right sides for convenience, and the divided parts are arranged vertically. In FIG. 1, between a left and right sub-frames 2 and 3, a support shaft 4 is suspended, a drive shaft 5 is rotatably supported, and an air pipe 6 is horizontally supported via support members 7, 7. It is suspended. The drive shaft 5 is configured to be rotationally driven by a drive device (not shown) on the subframe 2 side, and five drive pulleys 8 are mounted on the drive shaft 5.

[0007] Five brackets 9 extending to the drive shaft 5 are fixed to the support shaft 4 corresponding to the drive pulley 8, and two guide pulleys shown in FIG. 10, 11 and the tension pulley 12 are rotatably supported. These guide pulleys 10, 1
1, tension pulley 12 and drive pulley 8 described above
, An endless flat belt 13 is stretched, and the above-described drive shaft 5 is driven to rotate in the direction of arrow A in the figure via a drive pulley 8.

A large number of suction ports 14 are formed in the flat belt 13, and corresponding to the suction ports 14, suction holes (not shown) connected to an air duct 15 are provided at the upper end surface of the bracket 9. Z) is provided. The air duct 15 is connected to the air pipe 6, and when a suction air source (not shown) is operated, the air is sucked from the suction port 14 and the conveyed paper 20 travels at a speed lower than the conveying speed. It is configured to be decelerated by being sucked into the vehicle, to have its running inertia weakened, and to be dropped and loaded on the plate removing plate 16 (see FIG. 2). Reference numeral 21 denotes a star wheel having a large number of narrow star wheels, rotatably supported by a support member 22 fixed to the support shaft 4, and via a ring 23 and a rubber ring 24 axially mounted on the drive shaft 5. The drive shaft 5 is configured to be rotationally driven with the rotation of the drive shaft 5.

In FIG. 2, reference numerals 25 and 26 denote a pair of left and right discharge frames. Inside these discharge frames 25 and 26, brackets 27 for fixing a chain guide for guiding a discharge chain (not shown) are provided. Is attached. Reference numeral 30 denotes an air pipe connected to a discharge air source. The air pipe 30 is provided with a number of nozzles 31 for blowing air onto the paper 20 from above. One end of the air pipe 30 is connected to the subframe 3 via a bracket 33.
, And a bracket 35 for rotatably supporting the roller 34 is fixed to the other end, and the roller 34 is placed on the fixing member 28 of the bracket 27.

Inside the pair of left and right sub-frames 2 and 3 are fixed supporting members 35 and 35 having screw portions formed in the directions of arrows AB in the drawing, and the above-mentioned supporting members 7 and 7 are fixed. Also, threaded portions formed on the same axis as the threaded portions of the bearing members 35, 35 are formed. The support member 7 and the threaded portion of the support member 35 include a pair of screw rods 3.
The screw rods 36, 36 are rotatably supported by the paper discharge frames 25, 26 via brackets, and are configured to rotate in synchronization with each other by a drive source (not shown). Have been.

Therefore, when the screw rods 36, 36 are driven to rotate, the left and right sub-frames 2, 3 move in the vertical direction of the paper 20 (the direction of the arrow AB), and accordingly, the flat belt 13 and the star wheel 21 are moved. Also moves in the vertical direction of the paper 20 according to the size of the paper 20. In addition, air pipe 3
The roller 34 moves integrally with the sub-frame 3 via the bracket 33 in the vertical direction of the paper 20 while rolling on the fixing member 28. In FIG. 2, reference numeral 37 denotes an abutment which is urged by a spring so that the tip thereof abuts on the board 16, so that the paper 20 dropped on the board 16 does not fall from the board 16. Is what you do.

Next, an operation of sucking the conveyed paper 20 in the suction device of the sheet-fed rotary printing press thus configured will be described. After printing, the paper 2 which is held in a holding claw device of a delivery chain (not shown) and conveyed in the direction of arrow A in the figure
0 indicates a paper 20 when the grip ends pass the five flat belts 13.
Run in sliding contact with these flat belts 13. At this time,
The drive shaft 5 is also driven to rotate, and the drive pulley 8 also rotates, so that the five flat belts 13 travel in the direction of arrow A.
In addition, a suction air source (not shown) has been started, and
Since the outside air around the flat belts 13 is sucked into the suction port 14, the paper 20 is conveyed while being suctioned to the peripheral surface of the flat belt 13.

Also, a discharge air source (not shown) is operating, and air discharged from the nozzle 31 of the air pipe 30 is blown in the direction of arrow E in FIG. Let it. Accordingly, the speed of the paper becomes slower than the conveying speed on the grip side, and the paper 20 becomes taut and the traveling inertia is attenuated, so that the paper alignment at the time of drop loading on the board 16 is improved. The suction device described above does not differ significantly from the suction device of a conventionally used sheet-fed rotary printing press.

Next, the nozzles 50A to 50F for blow-off air, which is a feature of the present invention, will be described. Since the structure for fixing these nozzles 50A to 50F to the support shaft 4 via the bracket 40 is the same,
Only the fixing structure of B will be described. On the support shaft 4 described above, three pairs of brackets 40 are attached on the left and right with respect to the center line GG in the width direction of the paper 20. That is,
As shown in FIG. 3, a U-shaped groove 41 is formed at the front end of the bracket 40, and the inner diameter of the groove 41 is slightly larger than the outer diameter of the support shaft 4.
A screw portion 42 reaching the groove 41 is formed at the front end of the “0”. Reference numeral 43 denotes a screw with a knob, which is screwed into the screw portion 42 of the bracket 40 and presses the support shaft 4 at the distal end, whereby the support shaft 4 is sandwiched between the distal end of the screw 43 with the knob and the groove 41. 40 is fixed to the support shaft 4. Reference numeral 44 denotes a round nut, which is screwed into the screw 43 with a knob and pressed against the surface of the bracket 40 to
The loosening of the thumb screw 43 is restricted.

At the rear end of the bracket 40, an upper part of an L-shaped support member 45 as viewed from the front is fixed by bolts, and a lower part of the support member 45 is provided with an insertion hole 46 penetrating in the directions of arrows AB. The insertion hole 46
Is provided with a screw portion 47 formed in the direction of arrow C-D communicating with. Reference numeral 50B denotes an L-shaped nozzle viewed from the side, which includes a horizontal portion 51 and a vertical portion 52, and has an outer diameter slightly smaller than the inner diameter of the insertion hole 46 of the support member 45, and an upper portion of the vertical portion 52 A bent portion 53 is formed so as to be inclined by an angle α in a front view, and an outlet 54 is provided at a tip of the bent portion 53. This nozzle 5
0B, when the horizontal portion 51 is inserted through the insertion hole 46 of the support member 45 and the set screw 55 is screwed into the screw portion 47, as shown in FIG. It is attached to the bracket 40 so as to be inclined. Reference numeral 56 denotes a hose having one end connected to the horizontal portion 51 of the nozzle 50B, and the other end connected to a discharge air source (not shown).

The bending direction of the bent portion 53 of the nozzles 50A to 50F attached to the six brackets 40 is the nozzle 50A positioned on the right side in the drawing with respect to the center line GG in the width direction of the paper. 50C to 50C are directed to the right, and the nozzles 50D to 50F positioned to the left are directed to the left. That is, the bent portion 53 of each of the nozzles 50A to 50F is directed to the outside of the paper 20.

The nozzle 50A positioned on the right side
The distance 1 between the nozzle 50A and the nozzle 50B located on the outside in the width direction of the paper 20 is
Nozzle 50C and Nozzle 50 located at the center in the width direction of
The interval is set to be shorter than the interval L between B. Similarly, the nozzles 50D to 50F positioned on the left side
The interval between the nozzles 5 is located outside the paper 20 in the width direction.
The distance 1 between the nozzle 50E and the nozzle 50E is equal to the distance L between the nozzle 50D and the nozzle 50E located on the center side of the paper 20 in the width direction.
It is set to be shorter than

Next, the operation of discharging air by the nozzles 50A to 50F for blowing air will be described with reference to FIG. After printing, the paper 20 conveyed while being held by the holding claw device of the discharge chain (not shown) is drawn by the outside air around the five flat belts 13 into the suction port 14 as described above. The paper 20 is conveyed while being attracted to the peripheral surface of the flat belt 13. At this time, the nozzle 5
The discharge air sources 0A to 50F are also started, and the air 60 discharged from the discharge ports 54 of the nozzles 50A to 50F is blown from below the paper 20. For this reason, even if the paper 20 is drooped between the flat belts 13, the paper 20 is blown up by the air 60 blown from below the paper 20, so that the dripping is corrected.

At this time, the nozzles 50A to 50A
Since the bent portion 53 of 0F is directed to the outside of the paper 20,
The air 60 discharged from the outlets 54 of the nozzles 50 </ b> A to 50 </ b> F acts on the paper 20 so as to pull each other at both ends in the width direction of the paper 20. Therefore, paper 2
0 is tensioned in the width direction of the paper 20 and flattened, so that both ends of the paper 20 do not come off from the flat belts 13 and 13 positioned at both ends. , 13. Therefore, the conveyance speed of the paper 20 can be sufficiently reduced,
Since the flapping of the paper 20 is prevented, when the paper 20 is stacked on the board 16, the alignment of the paper edges does not deteriorate,
Since there is no contact with the bracket 9, there is no possibility that the printed surface is damaged.

Further, since the bent portion 53 of each of the nozzles 50A to 50F is directed to the outside of the paper 20 and the bent portion 53 is inclined by the angle α in a front view, compared with the case where the nozzle is not inclined, As shown in FIG.
The range W sprayed to 0 becomes wider. Therefore, paper 20
Is blown up uniformly as a whole without being partially blown up, so that when the paper 20 is conveyed while being adsorbed on the peripheral surface of the five flat belts 13, the paper 20 becomes flat, and The transport speed can be sufficiently reduced. Further, since the range of the air 60 blown onto the paper 20 is increased, the air volume of the air 60 per unit area of the paper 20 is reduced. The amount of adjustment of the air volume can be set finely. Furthermore, since the air 60 is blown toward the outside of both ends of the paper 20, even if the size of the paper 20 increases, the air 60 is blown to both ends of the paper 20. Can also respond.

The interval 1 between the nozzle 50A and the nozzle 50B located outside the paper 20 in the width direction is shorter than the interval L between the nozzle 50C and the nozzle 50B located at the center in the width direction of the paper 20. It is set as follows. The interval 1 between the nozzle 50F and the nozzle 50E located on the outer side in the width direction of the paper 20 is set to be shorter than the interval L between the nozzle 50D and the nozzle 50E located on the center side in the width direction of the paper 20. I have. Therefore, the amount of air blown to the outer portion in the width direction of the paper 20 increases, and the tensile force for pulling both ends in the width direction of the paper 20 to each other increases, and the tension in the width direction of the paper 20 becomes more reliable.

Here, the size of the paper 20 is changed,
When it becomes necessary to adjust the tension applied to the support member 45, the set screw 55 is loosened from the screw portion 47 of the support member 45 and the horizontal portion 51 of the nozzle 50B is inserted into the insertion hole 46 of the support member 45 in FIG. To change the inclination angle α.

FIG. 5 is a sectional view taken along the line IV-IV in FIG. 3 showing the second embodiment of the present invention. In the second embodiment, the bent portion 53 and the vertical portion 52 of the nozzle 50B are separated, the bent portion 53 is rotatably supported on the upper portion of the vertical portion 52, and is fixed by the set screw 61. It is configured as follows. Therefore, the set screw 61 is loosened and the bent portion 5
3 is rotated with respect to the vertical portion 52, so that the air discharge direction is not limited to the paper width direction as in the first embodiment described above, but is combined with the paper width direction and the top-to-bottom direction. Direction.

In the present embodiment, the paper 20 is slid on the endless flat belt 13, but it may be performed by a suction device using a suction wheel having a suction surface. Further, in this embodiment, the bracket 40 extends toward the air pipe 6 and the nozzles 50A to 50F are provided inside the suction device, that is, between the support shaft 4 and the air pipe 6, It may be provided outside the shaft 4 and the air pipe 6.

[0025]

As described above, according to the present invention, the dripping of the paper is reduced, and the air is inclined and ejected, so that the entire paper is conveyed while maintaining a flat shape and located at both ends. Both ends of the paper do not come off from the suction member. Therefore, a predetermined braking is applied to the paper,
The alignment of the paper is improved, and it is possible to prevent the back surface of the paper from contacting the bracket of the suction member and damaging the printing surface. Also, by blowing the air at an angle,
The adjustment of the amount of air blown to the paper becomes easy, and even when the size of the paper is changed and the size is increased, the air is blown to both ends in the width direction of the paper.

[Brief description of the drawings]

FIG. 1 is a plan view of a suction device in a sheet-fed rotary printing press according to the present invention.

FIG. 2 is a rear view of the suction device in the sheet-fed rotary printing press according to the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is a sectional view taken along the line IV-IV in FIG. 3, showing a second embodiment of the suction device in the sheet-fed rotary printing press according to the present invention.

[Explanation of symbols]

13 flat belt, 14 suction port, 20 paper, 40 bracket, 50A to 50F nozzle, 53 bent part,
60 ... air.

Claims (1)

[Claims] A sheet discharging device for discharging a sheet-like material; a suction device provided in the width direction of the sheet-like material on an upstream side in a sheet discharging direction of the sheet discharging device and below the sheet-like material; In a suction device of a sheet-fed rotary printing press provided with a plurality of suction surfaces that are connected to an air source and suction the sheet while sliding the sheet, the sheet is blown upward below the sheet. At least one pair of nozzles for discharging air are provided on both sides of the center of the sheet in the width direction, and the direction of air discharge from these nozzles is directed between the suction devices and outward in the width direction of the sheet. A suction device for a sheet-fed rotary printing press.