JPS60191959A - Paper discharge device for printer for separate sheets of paper - Google Patents

Abstract

PURPOSE:To prevent the upward curling, contamination, damage and the like of paper, by moving a paper front edge holder synchronously with the rotation of a printing cylinder, and using a suction unit to suck the paper after printing. CONSTITUTION:A paper front edge holder 8, in which openable and closable clampers 12 are attached to a support bar 11 attached to a pair of endless flexible conveying members 9 each having a length which is integer times as much as the circumference of a printing cylinder 5, in moved synchronously with the rotation of the printing cylinder, by a driver, so that paper being moved while being held by the holder 9 after printing is suched on the bottom of the paper by a suction unit 14. The upward curling, jamming and damage of the paper, the contamination of printed image, and the like are thus prevented, so that the printed paper with the sharp image is surely discharged. In addition, the constitution is made simple and compact.

Description

[Detailed description of the invention] Technical field The present invention relates to a paper discharge device for a sheet-fed printing press.

Prior Art Examples of conventional sheet-fed printing presses include a small-sized rotary copying machine shown in FIG. 1, a vehicle-mounted offset printing machine shown in FIG. 2, and a large-sized offset printing press (not shown). I can do it.

(1) In the rotary copying machine, the sheet-fed printing paper A placed on the paper feed stand 31 is transferred to the paper feed roller 32, separation roller 33,
When the feed roller set 34 transports the paper below the base paper 36 attached to the screen wound around the printing cylinder 35, the pressure roller 37 rises from the dotted line position to the solid line position and presses the paper against the base paper 36. printed. After printing, the paper A is peeled off by the paper ejection claw 38 located above it, which is inserted between it and the original paper 36, and is moved by the paper ejection roller set 39 as shown by the dotted line arrow to the paper ejection table 40. Paper is ejected.

(2) In a tabletop offset printing machine, paper A placed on a paper feed tray 41 is fed to an impression cylinder 47 by a paper feed roller 42 and a feed roller set 44, and is held by a gripping claw 51. , is pressed against the blanket cylinder (printing cylinder) 46 and printed.

After printing, the paper A is released by the gripping claw 51 of the impression cylinder 47, and the ejection f4L claw 48 located below is inserted between the paper A and the impression cylinder 47 and is peeled off. 49, the paper moves as indicated by the dotted arrow and is ejected onto the paper ejection table 50.

(3) Finally, in large offset printing presses, after printing is completed, the gripping claws of the impression cylinder release the paper, and the clamper attached to the flexible endless conveyance section removes the paper from the tip. 116
After the paper is held and moved to the paper ejection tray, the clamper releases the paper and ejects it to the paper ejection tray.

By the way, in the above (1), the paper discharge section 3"8 is the original M
31i ``eThere must be a gap between the two to prevent damage, so if paper A is thin, curled, or has a flat print on the leading edge,
Disadvantages include problems such as the paper A curling up without being completely peeled off, jamming, or the leading edge of the paper ejection section 38 getting stuck in the paper A, which requires the machine to be stopped and removed each time. was there.

In addition, in (2) above, when the paper A peeled off by the paper discharge section 48 is conveyed by the paper discharge roller set 49, the printed surface is rubbed by the rollers, and ink adheres to this. Since the ink may stain the image, there is a drawback that the position of the roller must be adjusted in a straight line or in accordance with the size of the paper to avoid this.

In addition, in the case of (3) above, since the trailing edge of the paper must be flanged until it is completely separated from the impression cylinder, the moving distance of the clamp e becomes large, and the space in the paper ejection section becomes large. The disadvantage was that the entire machine became larger.

Purpose The purpose of the present invention is to eliminate the drawbacks of the various conventional devices as described above, to prevent the occurrence of paper curling, jamming, damage, and smearing of images, and to eliminate the complicated adjustment of a set of paper ejection rollers. To provide a paper ejecting device that does not require a mechanism and does not increase the size of the whole.

4(.'1) The 414th component of this invention will be explained with reference to the embodiments shown in FIG. 3 and below.

Reference numeral 1 designates a feed tray, which is provided with a feed roller 2, a separation roller 3, a feed roller set 4, a pressure roller 7, and a paper discharge tray 10 as in the case of (1) above, and instead of the printing power 35. In this case, a printing cylinder 5 consisting of a plate cylinder is provided. In theory, if the printing method changes, the printing cylinder 5 will be changed to correspond to the change.

Reference numeral 6 indicates a paper discharge device installed below the printing cylinder 5. This paper ejecting device 66 has a length of 1 to 44% of the circumference of the printing cylinder 50.
A pair of flexible members 91M having a length of
1, there is a paper leading edge holding member 8 (FIG. 4) to which an opening/closing opening 2, which will be described in detail later, is attached, and a machine for driving this holding member 8 in synchronization with the rotation of the printing cylinder 5. A plurality of pulleys 13 are installed horizontally on the frame and the conveying member 9 is suspended, and a holding member 8 is positioned in front of the paper A in the moving direction.
It also includes a paper suction device 14 which is located further down and will be described in detail later.

The details of the clamper 12 are shown in FIGS. 5 and 6, and the support rod 11 is provided with a slit 15 in the vertical direction, into which a rotating shaft 16 is fitted, and both ends thereof are provided at both ends of the slit 15. The rotary shaft 16 is rotatably supported by a hanging wall, and the rotary shaft 16 is always urged to rotate counterclockwise in the figure by a torsion spring 17 interposed between the rotary shaft 16 and the support rod 11. . The base of an opening/closing piece 18 that can be opened and closed at the rear in the direction of movement (in the direction of the arrow) at a predetermined interval is fixed to such a rotating shaft 16, and is constantly attached to the upper surface of the support rod 1'l by the biasing force of a spring 17. An opening/closing arm 19 is provided vertically on the rotating shaft 1t.

FIG. 7 shows an enlarged paper suction device f14. In this device 14, a casing 20 is installed below the holding member 8 between the printing cylinder 5 and the paper table 10, and the upper opening of the casing 20 is installed below the holding member 8. In the section, an endless belt 21 consisting of a plurality of round belts, flat belts, etc. is stretched around a pair of rollers 22 and moves in the paper ejection direction shown by the arrow, and a suction fan 23 is installed below it. The air is discharged from the J/1 pores 24 provided in the casing 20 in the 1:J1 paper direction toward the paper discharge tray 10.

FIG. 8 shows another embodiment 14' of the suction device. In this embodiment, instead of the endless belt 21, a roller controller having a plurality of rollers 24 is used, and a suction fan 23 is used.
' is designed to exhaust air downward.

The effects of the above will be explained.

In FIG. 3, when the leading edge of paper A sent out by the feed roller set 4 approaches the holding member 8 in the same way as in the conventional case, the holding member 8 is The opening/closing arm 19, which is suspended from the rotating shaft 16 of the crank/e12, is rotated clockwise as shown by the arrow in FIG. After opening against the force of the spring 17, the force on the opening/closing arm 19 is removed when the leading edge of the paper A is inserted therein, and the opening/closing piece 18 closes by the force of the spring 17 to clamp the leading edge of the paper A. and move to the right in Figure 3.

At this time, when the clamps 12 move above the pressure roller 'l, the pressure roller 7 is lowered to the dotted line position by an actuating device 1'E (not shown), and when the clamper 12 passes, it is raised to the solid line position to hold the paper A. Printing is performed by pressing against the plate cylinder 5.

After printing, the paper A is brought onto the pulling suction device 14 and its back side is suctioned, so it is rolled up onto the plate cylinder 5 by the adhesive force of the ink. This caused a tendency for the sheet A to be pulled away due to the inhibition, and in this way the area of the sheet A covering the suction device 14 became larger, ensuring that the suction force was greater than the winding force by the plate cylinder 5. However, in other words, the conveying member 9 is bent and clamped.
At the point where ξ12 changes from lateral movement to downward movement, clamper L2''f opens again in the same manner as described above, and the flange of paper A is completely released. It will be released in 4th year.

It goes without saying that the above-mentioned members may have other configurations as long as they achieve equivalent functions.

Effects This invention is as described in gMJ, and has a pair of flexible endless conveyors 1"if (1"if) having a length twice as long as the circumference of the printing side (j). If possible, the paper leading edge holding member to which the run 8 is attached is moved by a drive member in synchronization with the rotation of the printing cylinder, and after printing, the paper held by this holding member and moving is sucked from the underside by a suction device. Because of this, it is possible to prevent the occurrence of paper curling, jamming, damage, and image staining, and to reliably extract clear printed matter.Moreover, its simple structure prevents the machine from increasing in size. It has excellent effects such as

[Brief explanation of drawings]

Figures 1 and 2 respectively relate to the discharge device of a branch printing press.
FIG. 3 is a longitudinal sectional front view of the main parts of two types of conventional intangible products; FIG. 3 is a longitudinal sectional front view of the comparative part of the embodiment of the present invention;
5th perspective view of part of the paper light 91'M holding member in ``2''
The figure is an enlarged perspective view of part A in Fig. 4, Fig. 6 is a sectional view along the line B-B in Fig. 4, Fig. 7 is an enlarged view of the main part of Fig. 3, and Fig. 8 is an enlarged perspective view of part A in Fig. 4. FIG. 7 is a longitudinal sectional front view showing a modification of the one in FIG. 6; 4... Feed roller set 5... Printing cylinder (plate cylinder) 6...
・Paper discharge device 7...Pressure roller 8...Paper leading edge holding member 9...Transport unit control 0...
・Paper output tray 11...Support rod 12...Kranzuku 13...Zori 14...Paper suction device 16...Rotary shaft 17...Torsion gear 18
...Opening/closing piece 20...Casing 23...Suction fan i par 1 "I1 Flk)-e+ Ijnl r1'; 3 ltsu1;; ("shi・'11'-'/1 ε'lT> 5

Claims (1)

[Claims] 1. A sheet-fed printing machine that is equipped with a printing cylinder and a pressing roller that is removably attached to the printing cylinder, and that prints by pressing the sheet-fed printing paper that passes between them onto the printing cylinder with a pressing roller, A pair of flexible endless conveyor members having a length that is an integral multiple of the circumference of the printing cylinder is provided with a support rod perpendicular to the direction of movement thereof, and a run that can be opened and closed is attached to this support rod. Paper destination ψ:
fli holding direction, a drive unit that moves this holding member in synchronization with the rotation of the printing cylinder, and a paper suction device b located in front of the printing cylinder in the paper movement direction and below the paper leading edge holding member. A general paper ejecting device characterized by: