JPS62205960A - Discharged paper adsorbing device for paper sheet printing machine - Google Patents

Abstract

PURPOSE:To permit adjustment of an adsorbing force, by providing a plurality of adsorbing ducts positioned between a driving pulley and a small diameter pulley, slidingly in contact with the rear surface of a flat belt and connected with an adsorbing air source through opening and closing means, respectively. CONSTITUTION:A blower 54 is rotated and valves 57 and 58 are opened to adsorb air onto a flat belt 51 from an air adsorbing port through both adsorbing chambers 52b, 52c and hoses 55, 46. When a printed paper sheet 28 is transported with its edges gripped by pawls 27 of a chain 26 in this condition, the paper sheet 28 is adsorbed onto the surface of the flat belt 51. One of the valves 57 (or 58) is closed when the paper sheet is thin and both the valves 57 and 58 are opened when the paper sheet is thick or hard. Thus, the paper 28 is brought into contact with the flat belt 51 and adsorbed by it over its long distance covering the two chambers 52b, 52c.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paper discharge suction device for a sheet-fed printing press that slides against and sucks the paper being conveyed after printing just before the paper is discharged. .

[Conventional technology]

In a sheet-fed printing press, the paper printed by the printing unit is conveyed while being gripped by the claws of a running paper ejection chain, and at the end of the conveyance, it is disassembled from the grip of the claws and ejected onto a paper stacking table. be done. Such a paper ejection device is provided with a paper ejection suction device that sucks and decelerates the conveyed paper immediately before ejection, and uses running inertia to eliminate paper disturbance during paper ejection.

1. Fig. 4 is a plan view of a conventional paper discharge suction device, and Fig. 5 is a plan view of a conventional paper ejection suction device.
To explain this based on the AAwr side view of the figure, there is a drive from the driving side between the left and right frames of the paper ejecting device. IAI] A drive shaft 1 that rotates in the direction shown by arrow B in the figure and a pipe 2 connected by a hose to a blower (not shown) are mounted parallel to each other. A plurality of suction wheels 3 are mounted in parallel in the axial direction. In this suction wheel 3, a plurality of grooves 3a opening to the circumferential surface and side surfaces are provided radially between the circumferential angles 90, and the side openings of the grooves 3a are closed by the disk 4. There is.

On the other hand, the arm 5, which is pivoted on the pipe 2 adjacent to each suction wheel 3, has its free end loosely attached to the drive shaft 1. A duct 5a is provided that allows the two to communicate with each other through a hole provided in the disc 4. γ
is an inverted-shaped plate-shaped guide plate provided between three adjacent suction wheels. The paper discharge suction device 8 configured as described above is provided on the paper conveyance path, and 9 indicates the paper released from the paper discharge chain and stacked on the paper stacking table.

FIG. 6 is a side view of the discharged paper suction device shown in correspondence with FIG. 5 to explain the suction operation. Numeral 11 denotes a gripping claw device (hereinafter referred to as "claw") consisting of a claw 11a and a claw base 11b, which are arranged in parallel on each of the claws supported at regular intervals between the left and right delivery chains 10. (abbreviated as 11). With this configuration, the discharging chain 1 is held by the claw 11 at its tip.
The paper 9 that has been conveyed by the 0-speed travel is brought into sliding contact with the circumferential surface of the suction wheel 3 at a portion other than the gripping end at the end of the conveyance. At this time, the circumferential speed of the suction wheel 3 is set lower than the running speed of the paper 9, and the phase is set so that the groove 3a faces upward when the paper 9 comes into sliding contact with the paper 9. , the inner hole of the pipe 2, and the suction force acting on the path of the duct 1-5a13a. Therefore, the paper 9 is the suction wheel 3
It is decelerated while sliding in contact with the pawl 11, becomes tense due to the speed difference with the pawl 11, and then is released from the grip of the pawl 11, so it does not run over the front piece due to running inertia or hit the front piece too hard and be damaged. There are no edges, and the paper edges are stacked evenly.

[Problem that the invention seeks to solve]

However, in such a conventional discharged paper suction device, as shown in FIG. 9, there is no problem when the paper 9 is thin paper, but there is a problem when the paper 9 is thick paper.

That is, FIG. 7 is a side view of the discharged paper suction device shown in correspondence with FIG. 6 to explain the suction state ylA in the case of thick paper. If the bent paper 9 is cardboard 9A, it is stiff, so the suction wheel 3
comes into line contact with the circumferential surface. Therefore, there is almost no braking effect on the paper 9A, so when the paper 9A is conveyed at high speed and is released from the grip of the claw 11, the paper 9A
A may hit the front plate at high speed, causing paper to break, or the recoil from the paper plate may cause the loaded paper to become uneven, and in the worst case, paper 9A may be caught in the machine, causing damage to the machine. I rarely had problems connecting.

[Means for solving problems]

In order to solve these problems, in the present invention, the suction wheels installed in parallel on the discharge paper conveyance path are supported by a drive pulley that is rotated and driven from the driving side, and a drive pulley that is supported at a distance from the drive pulley. A small-diameter pulley, a belt stretched between both pulleys and equipped with a plurality of air suction holes, and a suction air source that is located between both pulleys and whose opening end slides into contact with the back surface of the flat belt. It consists of a plurality of suction ducts that are individually connected through opening/closing means.

[Operation] When the drive pulley is driven and the suction air source is started, the drive pulley rotates and the flat belt runs, and the air on the flat belt running surface is sucked from the air suction hole of the flat belt through the suction duct. Therefore, the paper that is conveyed in surface contact with the flat belt is attracted and decelerated. The suction force is adjusted by opening and closing the opening/closing means provided in each suction duct according to the thickness and quality of the conveyed paper to draw suction from one chamber or two chambers.

〔Example〕

1 to 3 show an embodiment of the discharged paper suction device according to the present invention, FIG. 1 is a longitudinal sectional view of a suction wheel, FIG. 2 is a plan view thereof, and FIG. FIG. 2 is a schematic side view of the machine paper ejecting device. In the figure, a pair of front and rear sprocket shafts 22,
23 are pivotally supported, and each of these sprocket shafts 22.
Sprocket 2 with a pair of shafts attached to 23 on the left and right
4°25 and a sprocket on the printing unit side (not shown) runs in the direction shown by the arrow in the figure.

A pair of left and right paper ejection chains 26 are stretched.

A plurality of gripping claws 27 (hereinafter simply referred to as claws 27) each consisting of a claw and a claw base are arranged in parallel on each of the claw rods supported at regular intervals between the left and right paper ejection chains 26. 9. After printing, the paper 28 whose edge is gripped by the claw 27 is conveyed by the running of the paper ejection chain 26, and then released from the grip by the claw 2T opening in front of the sprocket 24 and falls. do. A paper stacking table 30 for stacking the falling papers 28 via a plate 29 is provided below the paper discharge frame 21 and is movable up and down, and automatically descends according to the amount of stacked papers. 31 is a front stopper that brings the front edge of the falling paper 28 into contact with it to align the paper edges. 32 is a side shifter that reciprocates in the paper width direction to vibrate the paper 28 and align the paper 28 in the width direction. It is.

In such a paper discharging device 20, a discharging paper suction device 40 is arranged close to the upper rear end of the stacked paper 28. That is, a drive shaft 41 that is driven from the driving side and rotates in the direction shown by arrow E in FIG. A medium Q-shaped support shaft 42 is fixedly supported between the left and right paper discharge frames 21. And these two axes 41.42
A plurality of suction wheels, generally designated by reference numeral 43, are arranged in parallel on the top. Each of these suction wheels 43 is equipped with a drive pulley 44 that is pivotally attached to a drive shaft 41.
4 is integrally formed with large diameter portions 44a on both sides and a small diameter portion 44b therebetween. In addition, a small diameter pulley formed in the shape of a mid-height hem with the same width as the drive pulley 44 is attached to the protruding bearing portion 45 & of the cylindrical bracket 45 which is pivotally attached to the support shaft 42 in correspondence with the drive pulley 44. 46 is rotatably supported on a shaft, and a pair of left and right bolts 48 that protrude obliquely downward from the outer periphery of the bracket 45 and are fixed with nuts 47 are equipped with small diameter tension pulleys that are also formed in the shape of a medium-high nut. 49 is supported by fitting holes provided in both end shafts. 5 oil'1. A nut is screwed onto the bolt 48 and rotated to adjust the movement of the tension pulley 49 in the radial direction. In this way 3
A flat belt 51 is attached to and stretched around three pulleys 44, 46, and 49 arranged in a rectangular shape, and the rotation of the drive pulley 44 causes the belt to move at a speed that is slightly slower than the transport speed of the υ paper 28. It is configured to run on. Note that the drive pulley 44
The peripheral surface of the flat belt 51 is knurled to prevent the belt 51 from slipping, and flanges are provided at both ends to prevent the flat belt 51 from coming off. Furthermore, a ball pair 7 is interposed at the end shaft portions of the small diameter pulley 46 and the tension pulley 49 to ensure smooth rotation. The flat belt 51 stretched in this manner is given tension by moving the tension pulley 49 outward by rotation of the nut 50. Reference numeral 52 denotes a suction duct formed in the shape of a rectangular box that opens upward, and is located between the drive pulley 44 and the small diameter pulley 46, and its front part is engaged with one of the small diameter parts 44b and 1 of the drive pulley 44. At the same time, the back surface of the flat belt 51 is in sliding contact with the upper opening end, and this suction duct 52 is connected to the adjacent suction wheel 40.
It is fixed to an inverted-shaped cover 53 fixed to the machine stand provided between the two.

Inside this suction duct 52, a pair of front and rear suction chambers 52b and 52c are defined by a partition plate 521L, and a hose port of each suction chamber 52b and 52c and a blower 54 provided on the machine base are connected to each other. They are connected by separate hoses 55, 56, and each hose 55, 56 is provided with a valve 57, 58 as an opening/closing means. Furthermore, a plurality of air suction holes 59 are formed in the flat belt 51 over its entire length, corresponding to the width of the duct 52. Reference numeral 60 denotes a guide formed in an arc shape to which the center portion of the flat belt 51 in the width direction is attached.

The operation of the paper ejecting device configured as above will be explained. Mark 111! During the work, the drive shaft 41 is constantly rotating and the belt 51 attached to the drive pulley 44 of the drive shaft 41 is running), and the blower 54 is rotating and the valve 57. 58 is opened, the air above the flat belt 51 is sucked from the air suction port 59 through both the suction chambers 52b and 52e and the hoses 55 and 56. In this state, when the printed paper 28 is conveyed with the paper end caught in the claw 2γ of the paper ejection chain 26, at the end of the conveyance, the paper 28 is separated from the metal belt 51 and the cover 5
Run while sliding in contact with 3. At this time, the paper 28 comes into surface contact with the flat belt 51, and the air suction hole 59 enters the suction chamber 52.
b, 52 (!) The paper 28 is decelerated by being attracted to the surface of the flat belt 51, which is running at a slow speed.
When it reaches in front of the sprocket 22, it is released from the grip of the pawl 27 and falls. Place the tip of the fallen paper 28 on the front 3
1 and stacked on the board 29 so that they are aligned in the vertical direction, and by being vibrated by the horizontal deflection 32, they are aligned in the left and right direction. In this case, since the paper 28 is decelerated by the suction wheel 43, it does not ride over the front cover 31 due to running inertia or strongly contact the front cover 31, causing the edges of the paper to become sticky.

The suction force of the suction wheel 43 can be adjusted depending on the opening degree of the pulps 57 and 58. For example, when the thickness of the paper 28 is thin, one of the pulps 57 (58)
) by closing one of the suction chambers 52b (528).
The suction from the machine will stop and appropriate suction force will be obtained. Also 1
Even if the paper 28 is thick or hard, if both pulps 57 and 58 are opened, the paper 28 will be in two chambers 52b and 52b.
Since the suction is carried out over a long distance of 52e in surface contact with the flat belt 51, a sufficient suction force can be obtained.

In this embodiment, the duct 52 has two suction chambers 52b'.
, 52c is shown, but three or more may be provided.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in the discharged paper suction device of a sheet-fed printing press, the suction wheels arranged in parallel on the discharged paper conveyance path are connected to a drive pulley that is rotatably driven from the driving side, and a drive pulley that is rotatably driven from the driving side. A small diameter pulley supported at a distance from the drive pulley, a flat belt stretched between these two pulleys and equipped with a plurality of air suction holes, and an upper open end located between both pulleys on the back side of the flat belt. The structure consists of a plurality of suction ducts that are in sliding contact with each other and are individually connected to the suction air source through opening/closing means, so that the paper conveyed by the paper delivery chain can be spread over a wide area on the running surface of the flat belt. Since the suction area makes surface contact and is suctioned, a strong suction force is obtained, and paper ejection function is improved by making it possible to eject sheets stably without paper alignment, defects, or scratches. In addition, by adjusting the opening degree of the opening/closing means, or by increasing the number of air suction chambers provided in the duct to one chamber (92 or more), the appropriate suction power can be maintained regardless of the thickness or quality of the paper. In addition, sufficient suction force can be obtained even when printing thick paper at high speeds, and stable paper ejection is possible.

[Brief explanation of drawings]

1 to 3 show an embodiment of the discharged paper suction device of a sheet-fed printing press according to the present invention, and FIG. 1 is a vertical A-I view of the suction wheel;
FIG. 2 is a plan view, FIG. 3 is a side view of a printing press discharge device in which the present invention is applied, FIG. 4 is a plan view of a conventional sheet-fed printing press discharge suction device, and FIG. The figure is AA@ in Figure 4.
Fig. 6 is a side view of a discharged paper suction device shown to explain the conventional suction operation, and Fig. 7 is a side view of the paper discharged suction device shown for explaining the conventional suction operation.
- Fig. 7 is a side view of the discharged paper suction device shown for explaining the suction operation in the case of -Ja. 26... Paper ejection chain, 27... Claw, 28...
...Paper, 4o... Paper discharge suction device, 41... Drive shaft, 42... Support shaft, 43... Suction wheel, 44...
...Drive pulley, 45...Bracket, 46...
・Small diameter pulley, 49...Tension pulley, 51・
... Belt, 52... ・Duct, 52a ・
...Partition plate, 52b. 52c...Air suction chamber, 54...Proa, 55
．． 56...Hose, 57.58...Pulp, 5
9...Air suction hole.

Claims (1)

[Claims] In a paper discharge suction device for a sheet-fed printing press, which includes a plurality of suction wheels that are arranged in parallel in a paper discharge conveyance path orthogonal to the conveyance direction and suction the conveyed paper by sliding the conveyed paper in sliding contact with the circumferential surface thereof, the suction wheels include: A drive pulley that is fixed on a drive shaft and driven to rotate, a small diameter pulley that is supported at a distance from the drive pulley, and a plurality of air suction units that are stretched so as to have a horizontal running surface between these two pulleys. A plurality of suction units are individually connected to a suction air source through opening/closing means between a flat belt having holes and a suction air source located between the two rollers and having an upper open end slidably in contact with the back surface of the flat belt. A discharge suction device for a sheet-fed printing press, characterized by comprising a duct.