JP3361380B2 - Sheet ejection device for sheet-fed printing press - Google Patents

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, and more particularly, to a sheet discharger, which has been printed, being conveyed onto a sheet discharge tray by a chain gripper and dropped. The present invention relates to a sheet discharging device for a sheet-fed printing machine loaded on top.

[0002]

2. Description of the Related Art Conventionally, in this type of paper discharge device,
In order to stack the sheets at the correct position on the paper ejection tray, a fan group having at least 4 rows and 4 rows arranged in the sheet conveying direction and the sheet width direction is arranged at the front, rear, left and right, and the center front and rear 2 When divided into four groups, each group is provided with means for simultaneously adjusting the air volume of the fan in each group, and when the sheet quality or paper thickness changes,
The air volume is adjusted while observing the state of the paper in each group, and the optimum air volume adjustment position is found (see Japanese Utility Model Publication No. 4-48709). Since it is installed and air is sucked from the upper part of the paper guide, there is no accumulation of air on the paper surface on the paper guide, the paper sheet is stuck on the paper guide, and the flapping of the paper bottom is prevented,
I try to stack them neatly on the output tray (actual fairness 4-
See Japanese Patent No. 3800).

[0003]

However, in the above-mentioned one, it is necessary to adjust the air volume of each group every time the paper quality of the sheet changes, and especially in the case of thin paper, it is necessary to adjust the air volume of the fan only. Cannot be removed, and even if it is, the air in the center cannot be removed by just sucking the fan motor, and the paper alignment becomes unstable. Is generally practiced.

Therefore, the present invention has been made in view of the above circumstances, and even if the sheet is a thin sheet, air can be sufficiently released, and the sheet can be accurately and easily aligned. An object of the present invention is to provide a sheet discharging device.

[0005]

In order to solve the above-mentioned problems, a sheet discharging device of a sheet-fed printing machine according to the present invention conveys a sheet, which has been printed by a printing section, onto a sheet-discharging table by a chain gripper. In a sheet discharging device of a sheet-fed printing press that is dropped and stacked, a fan is provided toward the sheet above the sheet drop portion, and the sheet is placed between the fan and the sheet. It is equipped with an air rectifier that moves the blowing air position on the paper from the center to both sides.In addition, the sheets that have been printed in the printing section are conveyed and dropped by the chain gripper onto the paper ejection tray and stacked. In the sheet discharge device of the sheet-fed printing press, a fan is provided toward the sheet above the sheet drop portion, and a blowing air for the sheet is provided between the fan and the sheet. Installed an air rectifier that moves the position from the center to both outsides. , Above the fan speed, to follow the rotational speed of the printing press is obtained by controlling to rotate.

[0006]

According to the above construction, air is blown by the fan onto the sheets falling on the falling portion of the sheet. The blown air moves from the center of the sheet to both outsides by the air rectifier. Since the air flows between the sheets, the air between the sheets can be released without accumulation, and the sheets can be accurately aligned.

Further, as the rotational speed of the printing machine becomes faster, the interval between the sheets falling in the drop section becomes shorter, and accordingly, the rotational speed of the fan is made faster to increase the air blowing amount, so that the speed can be increased. The sheets can be deflated to align the paper.

[0008]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a side view showing a sheet discharge device of a sheet-fed printing machine according to the present invention, FIG. 2 is a front view showing a sheet discharge device of a sheet-fed printing machine according to the present invention, and FIG. It is a front view which shows the operating state of a paper apparatus. FIG. 1 shows a sheet discharging device of a sheet-fed printing machine according to the present invention (hereinafter simply referred to as a sheet discharging device). The sheet discharging device is configured to print a sheet 2 printed by a printing unit (not shown). A fan 6 is provided toward the sheet 2 above the drop portion 5 of the sheet 2 when the chain gripper 3 conveys and drops the sheet 2 onto the sheet discharge tray 4, and further stacks the fan 6 and the sheet 2 together. And an air rectifier 7 for moving the blowing air position for the sheet 2 from the central portion to both outer sides.

The sheet 2 is printed by passing between the blanket cylinder and the impression cylinder of the printing unit, and then the leading end of the sheet 2 is clamped by the chain gripper 3 and conveyed to above the paper discharge table 4. Then, the chain gripper 3 is opened and the sheet is released,
It falls on the falling part 5.

The fan 6 is connected to a variable speed motor, and its rotation speed is controlled by a signal from a tachometer (not shown) that detects the rotation speed of the printing press. That is, when the rotation speed of the printing machine becomes faster, the interval between the paper release timing of the printed sheet 2 and the paper release timing of the next sheet becomes shorter in time, so that it is necessary to increase the air velocity. Therefore, the rotation of the fan 6 is made to follow the rotation speed of the printing machine to increase the air. On the contrary, if the rotation speed of the printing machine becomes slower, the interval of the paper release timing becomes longer,
Slowly rotate the fan 6 to reduce the amount of air.

The air rectifier 7 has rectifying plates 12 and 13 fixed to rotary shafts 10 and 11 which are rotatably supported by a rectifier frame (not shown) of FIG. The operating mechanism of FIG.
With 14, the rotary shafts 10 and 11 are operated as a center as shown by an arrow A in FIG. In this operating mechanism 14, one end of a link 15 is fixed to the rotating shaft 10, the center portion of the V-shaped link 16 is fixed to the rotating shaft 11, and the other end of the link 15 and one end of the V-shaped link 16 are fixed. Both ends of the link 17 are rotatably connected between the two. The center portion of the L-shaped link 20 is rotatably attached to the shaft 19 fixed to the frame 18, and both ends of the link 21 are provided between one end of the L-shaped link 20 and the other end of the V-shaped link 16. Is rotatably connected. The cam 22 is rotatably attached to a frame (not shown) by a shaft 23.
One end is in contact with a link 25 fixed to a shaft 24 via a roller 26, and both ends of a link 27 are rotatably connected between the other end of the link 25 and the other end of the L-shaped link 20. This cam
The shaft 23 of 22 rotates in association with one rotation of the printing machine.
Each time a sheet is conveyed and dropped to the drop section 5 of the paper discharge device, the straightening plates 12 and 13 of the air straightening device 7 are moved from the position indicated by the solid line in FIG. To return to. Therefore, the air blown from the fan 6 is
The sheets 2 are supplied from the center of the sheet 2 to both outer sides, and the air between the sheets is blown out.

Next, the operation of the sheet discharging device 1 of the sheet-fed printing press having the above-mentioned structure will be described. First, the sheets are fed one by one from the paper feeding section of the printing machine and printed by the printing section, then held by the chain gripper 3 of the paper ejecting apparatus and conveyed to reach the dropping section 5. Is released and the sheet 2 falls. At this time, the rotation speed of the fan 6 is set according to the rotation speed of the printing machine, and necessary and sufficient air is blown onto the sheet 2 from the fan 6. Immediately after the falling sheet 2 has dropped onto the most recently aligned sheet 2, the air rectifier 7
The straightening vanes 10 and 11 of FIG. 3 are at the positions shown by the solid lines in FIG. 3, and the air from the fan 6 is blown onto the central portion of the sheet 2,
Gradually, the straightening vanes 10 and 11 are moved to the positions shown by the chain double-dashed line in FIG. 3, and are blown so as to discharge the air between the sheets 2 to both outsides, so that the sheets 2 are properly arranged. Paper alignment is performed.

[0013]

As described above in detail, according to the sheet discharging device of the sheet-fed printing machine of the present invention, air is blown by the fan to the sheet falling on the drop portion of the sheet. The blown air moves from the center of the sheet to both outer sides by the air rectifier, so that the air between the sheets can escape without accumulating and the sheets can be accurately aligned. Therefore, even if the sheet is thin, even if the sheet is thin, the air can be surely evacuated, so that there is an effect that the sheet can be neatly stacked on the discharge tray.

Further, as the rotation speed of the printing machine becomes faster, the interval between the sheets falling on the drop portion becomes shorter, and accordingly, the rotation speed of the fan is made faster to increase the amount of air blown, thus promptly. The sheets can be deflated to align the paper. Therefore, in addition to the above-mentioned effect, even if the printing speed becomes faster, the sheets can be neatly loaded on the paper discharge tray by following the speed.

[Brief description of drawings]

FIG. 1 is a side view showing a sheet discharge device of a sheet-fed printing press according to the present invention.

FIG. 2 is a front view showing a sheet discharge device of the sheet-fed printing press according to the present invention.

FIG. 3 is a front view showing an operating state of the sheet discharge device of the sheet-fed printing press according to the present invention.

[Explanation of symbols]

2 Sheets of paper 3 Chain gripper 4 Paper ejection stand 5 Drop part 6 Fan 7 Air straightener

Claims (2)

(57) [Claims] 1. A sheet discharging device of a sheet-fed printing machine, in which a sheet, which has been printed by a printing section, is conveyed and dropped by a chain gripper onto a sheet-discharging table, and is stacked above the sheet dropping section. Is provided with a fan toward the sheet, and an air rectifier for moving the blowing air position for the sheet from the center to both outsides is provided between the fan and the sheet. Paper ejection device for sheet-fed printing press. 2. A sheet discharging device of a sheet-fed printing machine, in which a sheet, which has been printed by a printing unit, is conveyed and dropped by a chain gripper onto a sheet-discharging table, and is stacked above the sheet dropping unit. A fan is installed toward the sheet, and an air rectifier that moves the blowing air position for the sheet from the center to both outsides is provided between the fan and the sheet. Is controlled so as to rotate following the rotation speed of the printing machine.