JPH0812152A - Paper discharge device for sheet-fed printer - Google Patents

Abstract

PURPOSE:To simplify a structure by dispensing with a suction chamber or a blower, a large number of rollers to constitute an under paper guide surface or the like. CONSTITUTION:When printing paper after being printed is gripped by a chain gripper and is supported by an under paper guide part 20 and is carried in the paper pile direction, air of a wedge-shaped space part formed between the sheet fed paper and an inclined face part 21 is discharged by travel of the sheet-fed paper, and the wedge shaped space part is put under lower pressure than the periphery, and the sheet fed paper is pressed against the under paper guide part 20, and does not flap, and the sheet-fed paper is stably moved along the under paper guide part 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet discharge device of a sheet-fed printing press.

[0002]

2. Description of the Related Art A conventional sheet discharge device of a sheet-fed printing press will be described with reference to FIG. 4. 1 is a blanket cylinder, 2 is an impression cylinder, 3 is a discharge cylinder, 4 is a sheet after printing, and 5 is a chain. , 6 are guide rollers, 7 is a chain gripper attached to the chain 5,
Reference numeral 8 is a stopper, 9 is a paper pile, and 10 is a paper bottom guide portion arranged below the movement path of the chain gripper 7.

In the sheet discharge device of the sheet-fed printing press shown in FIG. 4, the printed sheet 4 passing between the blanket cylinder 1 and the impression cylinder 2 is transferred from the impression cylinder 2 to the discharge cylinder 3. And then gripped by the chain gripper 7 and under the paper guide unit 1
It is supported by 0 and conveyed in the direction of the paper pile 9, separated from the chain gripper 7 at the position of the stopper 8, and stacked on the paper pile 9 one after another.

5A to 5C show details of the chain gripper 7. 11 is a chain gripper shaft,
Both ends of the chain gripper shaft 11 are supported by the chain 5, and pawl seats 13 are fixed to the chain gripper shaft 11 at a plurality of axial positions. 12 is an axis fixing jig 1
6 is a pawl shaft supported in parallel with the chain gripper shaft 11, and the pawl shaft 12 is rotatable about its own central axis. The pawl shaft 12 has a pawl shaft 12 at a position facing the pawl seat 13. 14 is fixed. Reference numeral 15 is a spring for urging the claw 14 toward the claw seat 13, and the printed sheet 4 has the claw 14 and the claw seat 1
It is designed to be gripped with 3.

[0005]

In the conventional sheet discharging device of the sheet-fed printing press shown in FIGS. 4 and 5, the sheet 4 being conveyed flaps, and the sheet 4 is wrinkled, scratched, Failure such as breakage may occur. This is caused by the fluctuation pressure of the air flow due to the relative movement between the sheet 4 and the air, and the inertial force due to the change in the direction of the sheet 4.

At the printing speeds up to now, both the aerodynamic force and the inertial force are relatively small with respect to gravity, and no particular trouble occurs. However, as the printing speed increases, both the aerodynamic force and the inertial force are secondary. Since the number increases functionally, the fluttering of the sheet 4 sharply increases, and the obstacle becomes apparent, which is an obstacle to speeding up the printing press. That is, in the conventional paper guide unit 10, as shown in FIG.
As shown in FIG. 6A, a curved plate-like member having a smooth surface only, and as shown in FIG. 6B, an escape hole 30 for an air blow (not shown) for ejecting the set-off prevention powder on the curved plate. However, these paper guide parts 10 do not have the function of positively suppressing the fluttering.

On the other hand, the under-paper guide portion 1 for preventing fluttering
As shown in FIGS. 7A and 7B, the paper lower guide surface is constituted by a large number of rollers 31, and air is sucked through the gaps between the rollers to set the sheet 4 to the paper lower guide portion. Although it is proposed that the paper lower guide portion 10 sucks to the 10 side, the paper lower guide portion 10 requires a chamber 32 and a blower 33 for suction, and the paper lower guide surface has a large number of rollers 3.
Since it is configured by 1, there are drawbacks such as a complicated structure.

The present invention has been proposed in view of the above problems, and the object thereof is to eliminate the need for a suction chamber, a blower, a large number of rollers constituting the paper guide surface, and the like. The point is to provide a sheet discharge device of a sheet-fed printing press that can be simplified.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a paper guide portion which holds a printed sheet by a chain gripper and is arranged below the chain gripper moving path. In a paper discharge device of a printing machine which is supported and conveyed by a sheet, a plurality of slanted surface portions with open front ends are gradually provided in the paper lower guide portion toward the downstream side in the sheet conveying direction. Are provided in parallel with each other in the conveying direction.

[0010]

The sheet discharge device of the sheet-fed printing press according to the present invention is configured as described above, and the printed sheet after printing is gripped by the chain gripper and supported by the lower paper guide portion to move in the paper pile direction. When conveyed, a wedge-shaped space is formed between the sheet and the inclined surface, and the air in this wedge-shaped space is discharged by the traveling of the sheet, and the wedge-shaped space becomes lower in pressure than the surroundings. , The sheet is pressed against the paper guide section,
The sheet does not flutter, and the sheet moves stably along the paper guide section.

[0011]

【Example】

(First Embodiment) Next, a paper discharge device of a sheet-fed printing press according to the present invention will be described with reference to a first embodiment shown in FIGS.
Reference numeral 0 denotes a paper bottom guide part, and a plurality of inclined surface parts 21 having a gap between the paper bottom guide part 20 gradually expanding toward the downstream side in the transport direction toward the downstream side in the transport direction and having an open front end are arranged in parallel in the paper transport direction. It is provided in the state. Reference numeral 22 is a flat portion formed around each inclined surface portion 21.

In this embodiment, the inclined surface portion 21 is the flat portion 22.
With respect to the angle .theta. = 3.degree. Also, slit pitch P = 50 mm, inclined surface length L = 30 mm
It has become. However, this value has an appropriate value depending on the printing speed, the type of paper, etc., and is set to this value. Next, the operation of the sheet discharge device of the sheet-fed printing press shown in FIGS. 1A and 1B will be described in detail.

When the printing paper after printing is gripped by the chain gripper 7 and supported by the paper lower guide portion 20 and conveyed in the direction of the paper pile 9, as shown in FIG. The air in the wedge-shaped space formed between the sheet 4 and the sheet 21 is discharged by the traveling of the sheet 4, the pressure in the wedge-shaped space becomes lower than the surroundings, and the sheet 4 is guided under the paper guide unit 20.
The sheet 4 is pressed against and does not flap, and the sheet 4 moves stably along the paper guide portion 20.

(Second Embodiment) FIGS. 2A and 2B show a second embodiment.
An example is shown. In this embodiment, the under-paper guide portion is composed of a plurality of fouir oils 23 each having an inclined surface and a fountain oil support 24 that supports both end parts of each fountain oil 23. The inclination angle, the installation interval, and the inclined surface length of the foil 23 are set to appropriate values determined by the printing speed, the type of paper, etc., as in the first embodiment.

Also in this embodiment, the same operation as in the first embodiment is performed.

[0016]

As described above, in the sheet discharging device of the sheet-fed printing press of the present invention, the printing paper after printing is gripped by the chain gripper and supported by the paper guide portion, and is conveyed in the paper pile direction. At this time, a wedge-shaped space portion is formed between the sheet and the inclined surface portion, and the air in the wedge-shaped space portion is discharged by the traveling of the sheet, so that the wedge-shaped space portion has a lower pressure than the surroundings, Since the sheet is moved stably along the paper guide without pressing it against the paper guide, the suction chamber, blower, and many rollers that make up the paper guide surface And the like can be eliminated, and the structure of the sheet discharge device of the sheet-fed printing press can be simplified.

[Brief description of drawings]

FIG. 1A shows a first sheet discharge device of a sheet-fed printing press according to the present invention.
The perspective view which shows an Example, (b) is a vertical side view which follows the arrow AA line of (a).

FIG. 2A is a perspective view showing a second embodiment of the paper discharge device, and FIG. 2B is a vertical sectional side view taken along the line BB of FIG.

FIG. 3 is an operation explanatory view of the paper discharge device.

FIG. 4 is a side view showing a paper discharge device of a conventional sheet-fed printing press.

5A is a front view showing a chain gripper of the paper discharge device, FIG. 5B is a front view showing a state of the chain gripper when gripping a paper, and FIG. 5C is a view c- of FIG. It is a vertical side view which follows the c line.

FIG. 6A is a perspective view showing an example of a conventional under-paper guide portion, and FIG. 6B is a perspective view showing another example of the under-paper guide portion.

FIG. 7A is a side view showing still another example of the conventional under-paper guide unit, and FIG. 7B is a perspective view of the under-paper guide unit.

[Explanation of symbols]

 20 Paper Bottom Guide Part 21 Inclined Surface Part 22 Flat Area around Inclined Surface Part 21

Claims (1)

[Claims] 1. A paper discharge device of a printing machine, wherein a printed paper sheet is gripped by a chain gripper and is supported and conveyed by a paper bottom guide portion arranged below the chain gripper moving path. Sheet-fed printing, characterized in that a plurality of slanted surface portions having openings at the leading end of the guide portion are gradually enlarged toward the downstream side in the sheet-feeding direction and are arranged in parallel in the sheet-fed direction. Machine ejector.