JPH0430203Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is used in a sheet-fed printing press, in which paper is fed onto a slip plate by a feeding device, and is adjusted vertically and vertically by a registration device at the tip of the slip plate.
This relates to a paper tensioning device that tensions paper that can be registered in the left and right directions so as not to wave.

[Conventional technology]

In a sheet-fed printing press, the paper stacked on the paper stacking table of the paper feeder is sucked up one by one by the suction device, starting from the top layer, and transported forward, where it is captured by rotating upper and lower paper feed rollers. After that, the paper is sent out onto the feeder board, and then sent out onto the differential plate by the paper feeding tape on the feeder board. At the tip of the difference plate, there is a front stopper that brings the tip of the fed paper into contact with it to adjust the vertical register, and one end of the paper that is pulled in so that it hits the gauge with the upper and lower rotating rollers. A transverse needle device for directional register is provided. The edge of the paper thus registered is conveyed by the grip of the swing device or the claw of the paper feed cylinder, and the paper surface is printed while being transferred by being gripped by the claw of the printing cylinder.

[Problem that the invention attempts to solve]

However, in conventional sheet-fed printing presses, only one side of the horizontal needle device, which is provided on both the left and right sides of the difference plate, is always used, for example on the left side for front printing and on the right side for back printing. Because one side of the paper is not held, the paper may not be tensioned in the left-right direction, causing it to sag and become wavy. If the paper is fed as is to the printing device, printing problems such as misregistration may occur. It was hot. This has become a particular problem in recent years, where printing has become more diversified and paper called lightweight paper, which is thin in paper thickness, has become increasingly used in order to reduce costs.

[Means for solving problems]

In order to solve these problems, the present invention provides left and right needles with a plurality of air suction holes located in the paper running path and opened on the upper surface of the paper receiving plate provided in each of the left and right horizontal needle devices. A pair of ducts were provided, each duct and a suction air source were connected by air pipes, and an on-off valve and a switching valve were provided in the air pipes.

[Effect]

After setting one side needle device to the operating state and moving the other non-operating side needle device to the position where the paper edge passes over the paper receiving plate according to the paper size, switch the switching valve to the non-operating side and print. When the work begins, the leading edge of the paper fed onto the insert plate by the paper feeder hits the front plate and aligns the paper in the vertical direction. A moment later, the on-off valve opens and sucks air from the air suction hole in the paper receiving plate, thereby adsorbing the paper end to the paper receiving plate. At this time, the other horizontal stitching device intermittently repeats the operation of pulling the edge of the paper with the upper and lower rollers, so that the paper hits the gauge while being stretched in the left-right direction, and is aligned in the left-right direction. In this state, at the same time as the front cover is removed, the claw of the swing device grips the leading edge of the paper and transports it to the printing unit.

〔Example〕

1 to 4 show an embodiment of the paper sheeting device for a sheet-fed printing press according to the present invention, in which FIG. 1 is a front view as seen from the paper feeding device side, FIG. 2 is a plan view, and FIG. The figure is an enlarged front view of the horizontal needle device on the paper suction side and the paper tensioning device, and FIG. 4 is a plan view of the same. In the figure, between the left and right machine frames 1, a feeder board 2 is located in front of a paper feeding device (not shown) and is supported at a gentle inclination. A plurality of paper feeding tapes 4 are stretched in parallel in the width direction of the machine, and carry the fed paper 3 by holding it between feeding rollers and the like. A corner stay 5 located in front of the feeder board 2 and supported between the machine frame 1
A rear difference plate 6 divided into a plurality of pieces in the width direction of the machine is supported on the top, and as the horizontal stitching device 9 moves to change the paper size, which will be described later, several pieces of this rear difference plate 6 are is configured to be detachable.
Furthermore, a fixed type difference plate 7 is provided in front of the rear difference plate 6.
is supported by the left and right machine frame 1 sides and installed slightly inclined, and the front edge of this difference plate 7 is provided with a plurality of grooves 7a arranged in parallel in the width direction of the machine. Reference numeral 8 denotes a plurality of front supports that align the leading edge of the paper 3 fed from the feeder board 2 side in the vertical direction, and have their base ends fixed to a lower shaft. When the claw grips the edge of the paper 3 and conveys it, the front cover 8 is configured to move diagonally downward from the position shown in the figure by rotation of the shaft.

Next, the left and right horizontal needle devices 9 provided on both sides of the rear differential plate 6 will be explained. That is, between the left and right machine frames 1, a cam shaft 11 that is connected to the drive side shaft by a coupling ring 10 and rotates is mounted below the square stay 5, and the left and right cross needle devices 9 are formed completely symmetrically to each other, and are located close to the left and right frames 1, respectively, and are connected to the camshaft 1.
1 and a corner stay 5. Reference numeral 13 denotes a paper holder having an L-shape when viewed from the front, and is fixed to the square stay 5 through a square hole so as to be movable and adjustable in the width direction of the paper. An inner ring of a cam 14 having cam surfaces 14a and 14b on its outer periphery is fixed, and an outer ring of the cam 14 is fitted and fixed to a circular boss 13a of a paper holder 13. 15 inserts a part of the outer periphery into a hole provided in the paper receiving plate 13b of the paper receiving stand 13, so that the paper receiving stand 13
The paper receiving roller is pivotally supported by a bearing part, and is positioned so that its upper end is at the same height as the surface of the paper receiving plate 13b, and a roller 16 that contacts the cam surface 14b is pivotally mounted on the outer periphery of the paper receiving roller. It is worn. A tension spring 18 that presses the roller 16 against the cam surface 14b is stretched between the pivot of the roller 16 and a spring hook 17 provided on the paper holder 13 side, and the cam 14 rotates together with the cam shaft 11. Accordingly, paper receiving roller 15
is configured to reciprocate in the direction shown by arrow A in the figure at a predetermined period while expanding and contracting the tension spring 18. Further, a horizontal roller arm 19 is rotatably supported on a bearing portion 13c provided on the paper holder 13 with a three-pronged cam lever 20 in the same phase back and forth. The presser roller 21 pivotally attached to the free end of the paper receiving roller 15
It is located directly above and in contact with this. Also,
A roller 22 pivotally attached to the lower end of the cam lever 20
is in contact with the cam surface 14a of the cam 14.
A compression coil spring 23 is interposed between the roller arm 19 and the cam lever 20, and the compression coil spring 23 resiliently rotates them in opposite directions. A bolt 24 with a regulating knob is screwed into the cam lever 20 with its tip in contact with the cam lever 20 so that its rotation can be adjusted freely, and a nut 2 that fixes it in the rotation adjustment position is inserted into the bolt 24.
5 are screwed together. A bolt 26 is screwed into the roller arm 19 to adjust the elastic force of the compression coil spring 23, and a nut 27 fixes the bolt 26 at the adjusted position. Further, 28 is a guide bolt which is screwed into the roller 19 and whose tip end is engaged with a hole in the cam lever 20, and a fixing nut 29 is screwed into this. And cam lever 2
A compression coil spring 30 is installed in a hole in the paper holder 13 below the horizontal free end of the cam lever 20, and applies a rotational force to the cam lever 20 in the direction of pressing the roller 22 against the cam surface 14a. On the other hand, roller arm 19
A presser plate 31 that is in contact with the paper receiving plate 13b of the paper receiving stand 13 is integrally formed at the tip of the paper receiving plate 13, and the paper 3 fed to the rear insert plate 6 by the paper feed tape 4 is transferred to the open presser plate. 31 and the paper receiving plate 13b. 33 is a gauge that brings the side edges of the hook 3 into contact to align the left and right direction. Furthermore, although not shown in FIG. 3, as shown in FIG. 4, a rectangular parallelepiped-shaped block 34 is fixed to the corner stay 5 with a bottle 35 with a knob, and the block 34 is movably adjustable. Adjacent to the block 34, another block 36 is fixed with a bolt 37 with a knob so as to be movable and adjustable together with the paper holder 13. When the size of the paper 3 changes, the bolts 35 and 37 are loosened, and the entire horizontal needle device 9 is moved on the square stay 5 to roughly position it, and then the bolt 35 is tightened and both blocks 34 and 36 are moved. After fine adjustment is made using a fine adjustment device 38 with left and right screws which are connected to each other, the bolt 37 is tightened and fixed. The cross-needle device 9 on the opposite side is also shaped symmetrically with the cross-needle device 9 described above, and has exactly the same configuration.

With the above configuration, when paper feeding is started and the camshaft 11 rotates, the cam 14 rotates, and the cam surface 14b causes the paper receiving roller 15 to move in the direction of the arrow with one reciprocation per rotation of the cam 14. Move back and forth in the A direction. Also, the cam lever 20 is connected to the cam surface 14.
Due to the action of a, the compression coil spring 30 rotates reciprocatingly while expanding and contracting at a rate of one reciprocation per rotation of the cam 14, and the elastic force of the compression coil spring 23 causes the bolt 24 to rotate.
The roller arm 19 which is brought into contact with the cam lever 20 also swings together. Therefore, the presser roller 21
moves up and down so as to be in contact with and away from the paper receiving roller 15. Then, when the presser roller 21 is raised and the presser plate 31 and paper receiving plate 13b are open, the paper 3 is fed onto the rear insert plate 6 and placed between the presser plate 31 and the paper receiving plate 13b. At the same time as the paper is inserted, the presser roller 21 descends and the paper receiving roller 15 rotates counterclockwise in the figure, so the paper 3 is held by both rollers 21 and 15 and moves to the left in the figure, until it reaches the edge. By bringing the edge into contact with the gauge 33, the register in the left and right direction is adjusted.

The horizontal needle device 9 that operates in this manner may be in an activated state or in an inactive state. In other words, when the sheets 3 that have been registered in the above operation and printed on the front side are stacked up at the paper output section, and then turned over and printed on the back side, the side that is the reference for registration is Since the edge is on the opposite side, the left side needle device 9 in the traveling direction of the paper 3 shown in the figure is made inactive, and the right side needle device 9 is put in the activated state. In this case, when the nut 25 is loosened and the bolt 24 is tightened at the lowered position of the presser roller 21, the roller arm 19 rotates counterclockwise while compressing the compression coil spring 23, and the presser roller 21 is moved to the paper receiving roller. Rise away from 15. After this, the nut 25 is tightened to fix the bolt 24. As a result, even if the cam 14 rotates, the presser rollers 21 only move up and down in the raised position, and do not clamp the paper 3, resulting in a non-operating state. Then, the cross needle device on the opposite side is changed from the non-operating state to the operating state by the above-mentioned reverse operation.

The horizontal needle device 9, which operates as described above, is provided with a paper tensioning device that suctions the opposite side of the paper 3 that is drawn in and stretches the paper 3 thereon. That is, ducts 41 formed in the shape of a rectangular box in plan view are fixed to the back surfaces of the paper receiving plates 13b of the left and right horizontal needle devices 9, and each duct 41 has a duct 41 formed in the shape of a rectangular box in plan view. A plurality of open air suction holes 42 are provided in parallel in the front and back. Flexible hoses 43 and 44 are connected to hose holes in the center of the bottom of each of the left and right ducts 41, and these hoses 43 and 44 extend in one direction of the frame on one side. . On the other hand, a vacuum pump 45 as a suction air source is provided on the frame 1 side.
An air pipe 46 is connected to this vacuum pump 45. The air pipe 46 and both hoses 43 and 44 are connected via a switching valve 47, and by switching the switching valve 47 as shown by the solid line and chain line in FIG. is configured to selectively communicate with the hose 43 side and the hose 44 side. Further, a timing valve 48 is provided in the air pipe 46 as an on-off valve that opens and closes at a predetermined timing, and opens and closes once per rotation of the machine, just before the paper 3 is drawn in by the horizontal needle device 9. It is configured to open and close at the same time as the horizontal needle device 9 releases the paper 3 from retraction.

The operation of the paper pasting device configured as above is as follows.
The case of reverse printing will be explained as an example. In the case of reverse printing, the horizontal needle device 9 on the right side when looking from the paper feeder side
is activated, and the left cross needle device 9 is deactivated by the operation described above. Further, the bolts 35 and 37 are loosened according to the paper size, and the horizontal needle devices 9 on both sides are moved. In this case, the horizontal needle device 9 on the active side is fixed so that the gauge 33 is in the correct position, and the horizontal needle device 9 on the non-active side is fixed so that the edge of the paper 3 is above the paper receiving plate 13b. Position and fix it so that it passes through. The switching valve 47 of the papering device is switched to the solid line position in FIG. 3 so that the air pipe 46 and the hose 43 communicate with each other. After this, when the printing operation is started, the paper 3 fed onto the feeder board 2 by the paper feeding device is conveyed by the paper feeding tape 4 and feeding rollers, and is sent out onto the feeding plate 7 via the rear feeding plate 6. In this case, when the paper 3 passes through the horizontal stitching device 9, the right end enters between the presser plate 31 and the paper receiving plate 13b whose entrance side is curved upward, and passes between the upper and lower rollers 21 and 15. However, at this time, the paper receiving roller 15 is reciprocating in the direction of arrow A by a predetermined angle, and the presser roller 21 is moving up and down, so the paper 3 is held against the upper and lower rollers 21, 1.
At step 5, the edge of the paper is pulled in until it touches the gauge 33, and the left and right registers are aligned.
By abutting the front end of the front support 8 against the front support 8, the vertical register can be adjusted. When registering by the horizontal needle device 9, the upper and lower rollers 21, 15 are aligned with the paper 3 by timing regulation of the timing valve 48.
Timing valve 48 opens a moment before pulling in,
Since the pressure inside the hose 43 is reduced, the air suction hole 42
The left end of the paper 3 passing over the paper receiving plate 13b is attracted to the paper receiving plate 13b.
Therefore, the left end of the paper 3, which is drawn to the right by the horizontal needle device 9 on the operating side, is stopped from moving to the right by the paper receiving plate 13b, and the paper 3 is tightly stretched without waving. It will be done. After the paper 3 comes into contact with the front cover 8, when the presser roller 21 starts its next upward movement, the timing valve 48 closes and the front cover 8 moves diagonally downward from the kerf 7a. At this time, the claw of the swing device grips the front end of the paper 3, conveys it, and supplies it to the printing device. At this time, since the paper 3 is supplied to the printing device in a tensioned state and printing is performed, printing failures such as misregistration do not occur.

[Effect of idea]

As is clear from the above explanation, according to the present invention, in a sheet-fed printing press, a pair of left and right ducts each having a plurality of air suction holes opened on the upper surface of the paper receiving plate of each of the left and right horizontal needle devices are provided. By connecting the duct and the suction air source with an air pipe and providing an on-off valve and a switching valve in this air pipe, the switching valve is switched to the non-operating side needle device. When the horizontal needle device on the active side is activated while conveying the paper so that the edge of the paper passes over the receiving plate, the opening/closing valve opens and the edge of the paper is sucked to the paper receiving plate. The paper being registered by the horizontal stitching device is tensioned without waving, and printing failures such as poor registration do not occur even if the paper is conveyed as it is to the printing device, and the quality of printed matter is improved.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the paper sheeting device for a sheet-fed printing press according to the present invention, in which FIG. 1 is a front view as seen from the paper feeding device side, FIG. 2 is a plan view, and FIG. The figure is an enlarged front view of the horizontal needle device and paper tensioning device on the side that sucks paper, and FIG. 4 is a plan view of the same. 2...Feeder board, 3...Paper, 4...Paper feeding tape, 6...Rear difference plate, 7...Difference plate, 8...
Front cover, 9...Horizontal needle device, 13...Paper holder, 1
3b...Paper receiving plate, 15...Paper receiving roller, 21...
...presser roller, 33...gauge, 41...duct,
42... Air suction hole, 43, 44... Hose, 4
5...Vacuum pump, 46...Air pipe, 47...Switching valve, 48...Timing valve.

Claims (1)

[Scope of utility model registration request] There is a difference plate supported between the paper feeding device and the printing unit, and one of the plates is disposed on the left and right sides of the difference plate in the paper feeding direction, and one of them is selectively used to feed the paper onto the difference plate. In a sheet-fed printing press equipped with a pair of horizontal needle devices that are movable and adjustable in the left-right direction for adjusting left-right registration, each of the horizontal needle devices includes a paper receiving plate located in a side edge passage path of the paper; A pair of left and right ducts each having a plurality of air suction holes opened on the upper surface of the paper receiving plate are provided, and these ducts are connected to a suction air source through an air pipe, and the air pipe is connected to the air pipe. The air pipe is switched so that an on-off valve that opens and closes at a predetermined timing in synchronization with the operation of the horizontal needle device and the duct on the side where the horizontal needle device is not used of the pair of ducts is connected to the suction air source. A paper tensioning device for a sheet-fed printing press, characterized in that it is provided with a switching valve.