JP2002370863A - Paper ejecting machine for paper sheet printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper ejecting machine for a paper sheet printing machine capable of dropping an inputted dropping sheet softly, thus preventing the sheet from being damaged, by forming an air layer at the lower part of the inputted dropping sheet. SOLUTION: This paper ejecting machine for the paper sheet printing machine, which permits a printing sheet 10 conveyed after the completion of prescribed printing to be inputted and dropped onto a paper ejecting table 11 and butt against a paper butting device 9 to align the printing sheets 10, is provided with an air spraying means A structured so as to spray air toward the central side of the sheet 10 from both sides near the paper butting device 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet discharging device for a sheet-fed printing press that stably discharges and stacks printed sheets onto a discharge table in a sheet-fed printing press. is there.

[0002]

2. Description of the Related Art There are various types of sheet-fed printing presses, and those illustrated in FIG. 6 mainly include a sheet feeding device 1, three sets of printing devices 2a to 2c, a coating unit 3, and a sheet discharging device. 4
And so on.

The function of the sheet-fed printing press will be briefly described. First, a sheet feeding device 1 stacks sheets (printing paper) 10 as printing materials on a sheet feeding table 20, Are sequentially supplied to the printing apparatus 2 in the next step one by one from the uppermost side. The printing device 2 is generally a unit in which a plurality of printing device units 2a to 2n having different ink colors are arranged side by side, and is a unit for performing predetermined printing on a sheet 10 continuously supplied from the paper feeding device 1. Yes,
In this example, three-color printing can be performed.
The printed sheets are sequentially transported through the intermediate cylinder 22.

[0004] Next, the coating unit 3 is a unit for applying a varnish coating to the printing surface of the sheet 10 which has been printed in the printing apparatus 2 in the previous process so as to have gloss, waterproofness and the like.

The sheet discharging device 4 includes a sheet transporting device 5 and a sheet stacking device 6. The sheet transporting device 5 has a sheet
An endless chain 19 provided with a chain gripper 7 for gripping the chain 0 is provided. Below the endless chain 19, a paper discharge table 11 suspended from a chain around which a sprocket is wound is provided. An elevating motor is connected to a part of the sprocket shaft, and the discharge table 11 can be arbitrarily raised and lowered by driving the motor.

Under the above configuration, the sheet (printed paper) 10 which has been subjected to the predetermined printing and coating is supplied to the endless chain 19 by the driven shaft 18 from the printing apparatus 2 in the preceding process.
After being transferred to the chain gripper 7 and transported to the discharge table 11 in a gripped state, it is released at a predetermined position and is dropped and stacked on the discharge table 11. Since the height of the upper surface of the uppermost sheet stacked on the discharge table 11 is increased by the thickness of the sequentially stacked sheets 10, the height is continuously increased to maintain a predetermined height (a drop from the chain gripper 7). Or, it is controlled to descend stepwise.

[0007] When a predetermined number of sheets are stacked, a partition plate is inserted into the sheet input section, and the succeeding sheet 10 is stacked on the sheet partition plate. At the same time, the discharge table 11 is lowered, and at the lowermost position, the sheets 10 stacked together with the lowermost pallet (board plate) are carried out via a forklift or the like to the outside. Subsequently, a new pallet is placed on the empty sheet discharge table 11 and then raised again to set it to the initial position. Then, the sheet 10 temporarily supported by the partition plate is received, and the operation of the sheet stacking device 6 is restarted. Thereafter, printing can be continuously performed by repeating the same operation.

By the way, the sheet stacking device 6 is provided with FIG.
A paper pad 9 is provided above the downstream side as shown in FIG.
The sheet 10 gripped and transported by the chain gripper 7 is released from the chain gripper 7 at an appropriate position in the sheet advancing direction via the paper release cam 8, falls, abuts on the paper abutment 9, and has a front end. The sheets are stacked on the discharge table 11 in the aligned state. As means for braking the speed when the sheet 10 falls and controlling the attitude, a vacuum suction wheel 21 is provided at the upper entrance of the sheet stacking device 6.
Is installed to eliminate the problem of collision with the paper pad 9. Normally, the vacuum suction wheel 21 increases or decreases the braking force by changing the rotation speed, that is, the peripheral speed with respect to the traveling speed of the seat 10, and thereby increases or decreases the braking force.
It is configured so that the mounting position can be changed appropriately according to the total length of the.

In the sheet stacking unit 6 of the general sheet discharging device 4, variations occur at the height position where the dropped sheet 10 comes into contact with the paper pad 9. For example, depending on various conditions such as the printing operation speed, the specification and deformation state of the sheet, the speed setting value of the vacuum suction wheel 21, and the like, the sheet 10 once collides with the paper pad 9 and then falls directly. When it falls on the upper surface of the sheet 10 before it reaches
There can be various states.

If the sheet 10 falls before reaching the paper pad 9, the front end of the sheet 10 comes into contact with the upper surface of the already stacked sheets 10 and moves in a rubbed state. In particular, when a varnish is coated on the printing surface of a thick paper having a solid print on the end face of the paper, the paper tends to curl (warp), and the same phenomenon may occur at the rear end or the center of the sheet.

[0011]

That is, according to the above prior art, the following problems occur. (1) The varnish on the sheet printing surface piled up at the paper edge of the falling sheet is scraped off, causing a problem that countless stains, abrasions, etc. are caused. (2) Although the scratches can be resolved by lowering the posture of the sheet that falls dropping technically horizontally, the type of paper, particularly the vertical streaks, the paper shrinkage due to dampening water, or the curl at the end of the claw gripper during paper conveyance In this case, it is difficult to completely prevent scratching.

According to the present invention, a sheet-fed printing press capable of solving the above-mentioned problems and forming an air layer below the input / falling sheet allows the sheet to fall softly and prevents damage to the sheet. It is an object of the present invention to provide a paper ejection device.

[0013]

According to the present invention, in order to solve the above-mentioned problems, a printing sheet which has been conveyed after predetermined printing is dropped on a discharge table and is applied to a paper application device. In a sheet discharging device of a sheet-fed printing press for aligning print sheets, air blowing means configured to blow air from both sides near the sheet contacting device toward the sheet central side is arranged.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. The sheet-fed printing press includes the paper feeding device 1, the printing devices 2a to 2n, the coating unit 3, and the paper discharging device 4 in FIG.
The unit includes a sheet conveying device 5 and a sheet stacking device 6. Above the sheet stacking unit 6, a paper release cam 8 that is in contact with and separates from the chain gripper 7 is provided.
Further, a paper contact device 9 and a side jogger (paper alignment device) (not shown) for defining a sheet side end position are provided downstream of and above the sheet stacking device 6 as a paper contact device. Since these basic configurations are the same as those described in the section of the related art, description thereof will be omitted.

The present invention is directed to a paper discharging device 4 in order to solve the problems remaining in the prior art described above, and the main part of the device is configured as shown in FIGS.

In the present embodiment, in the printing apparatus 2 and the coating unit 3, a sheet (printed paper) 10 on which printing and coating have been completed is conveyed to the sheet discharging apparatus 4, and the sheet stack disposed at the downstream end of the section. Discharge table 11 of the heavy equipment 6
As a means for stably stacking on the (board), in addition to the structure of the ordinary sheet stacking device 6, an apparatus near the paper pad 9, and an air duct 12 as an air blowing means A on both sides in the width direction. It is arranged.

Various methods such as fixing the air duct 12 to a bracket 13 supported by a side jogger or a frame at both ends of the sheet discharging device 4 can be adopted. The air outlets 14 of the air ducts 12 located on both sides are arranged in directions facing each other, that is, toward the center of the sheet 10.
5. It is connected to a compression pump or air blower 17 which is an air supply source via a control device 16.

The structure of the air duct 12 can be of various types. Duct 1 shown in FIGS. 4A and 4B
2 is a type in which the air blowout holes 14 provided on the surface of the opposed duct 12 are arranged in the horizontal direction, and FIG. This is a type that is arranged upward. or,
FIG. 4D shows a form in which the surface of the duct 12 is formed in an arc shape, and the air blowing holes 14 are arranged in a direction perpendicular to the surface. The air duct 12 and the air outlet 14 may have various structures other than those described above. The air is blown out continuously during the operation of the printing apparatus 2, but may be intermittently made in conjunction with the drop of the sheet 10. Also, the duct 12 is tilted,
It is configured to be able to move.

In the first embodiment of the present invention, the printed sheets 10 are stacked as described in the preceding paragraph,
When a predetermined number of bundles are to be taken out, the sheet 10 is gripped by a chain gripper 7 provided on an endless chain 19 that runs around a driven shaft 18 and is transported above the sheet stacking device 6. Subsequently, by the action of the paper release cam 8 provided above the apparatus 6, the sheet 10 is released from the chain gripper 7 and falls, and the sequentially falling sheet 10 abuts on the paper abutment 9 and its front end is aligned. In the state
The sheets are stacked on the discharge table 11 of the sheet stacking device 6.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

When the sheets are stacked, compressed air is blown from the air duct 12 toward the front end of the sheet 10 before being dropped and brought into contact with the paper pad 9. The blowing direction, (height, angle) and air volume of the compressed air are adjusted as appropriate by visually checking the falling posture of the sheet.

According to the above embodiment, the following effects can be obtained. By forming an air layer on the lower part of the dropped sheet 10, the sheet 10 can be dropped softly, and scratches can be prevented. In particular, the curled sheet 10 is also blown up with the front end by air,
It can greatly reduce the impact when falling. By blowing air, drying of the printing surface and the varnish-applied surface can be promoted, and dirt and scratches on the undried portion due to rubbing and sliding can be prevented (reduced).

It is needless to say that the present invention is not limited only to the above-described embodiment, and can be carried out with appropriate changes within a scope not changing the gist of the present invention.

[0024]

As described above, the sheet discharging device for a sheet-fed printing press according to the present invention has the following effects. In a sheet discharging device of a sheet-fed printing press in which a printed sheet conveyed after predetermined printing is dropped onto a sheet discharge table and the printed sheet is aligned by contacting the sheet contacting device, a sheet near the sheet contacting device is used. Air blowing means configured to blow air from both sides toward the center of the sheet is arranged, so by forming an air layer at the bottom of the dropped sheet, it is possible to drop the sheet softly, It is possible to prevent it. In particular, by blowing the front end of the curled sheet with air, the impact at the time of falling can be greatly reduced. Also, by blowing air,
It promotes drying of the printing surface and the varnish-applied surface, and can prevent (reduce) dirt and scratches on the undried portion due to rubbing and sliding.

[Brief description of the drawings]

FIG. 1 is a plan view showing a basic configuration of a sheet discharging device in a sheet-fed printing press equipped with a scratch preventing means according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view of FIG. 1;

4A and 4B are configuration diagrams of an air duct unit provided in the paper discharge device, wherein FIG. 4A is a cross-sectional view, FIG. 4B is a side view of FIG.
And (d) is a sectional view showing a modification of the air duct portion.

FIG. 5 is a conceptual diagram illustrating the configuration and functions of a paper discharge unit provided in a conventional sheet-fed printing press.

FIG. 6 is a conceptual diagram illustrating an overall schematic configuration of a general sheet-fed printing press.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper feeder 2 Printing device 3 Coating unit 4 Discharge device 5 Sheet transport device 6 Sheet stacking device 7 Chain gripper 8 Paper release cam 9 Paper contact 10 Sheet (printed paper) 11 Discharge table 12 Air duct 13 Bracket 14 Air Blow-out hole 15 Piping 16 Control device 17 Compression pump or air blower 18 Follower shaft 19 Endless chain 20 Feeding table 21 Vacuum suction wheel 22 Intermediate cylinder P: Sheet-fed printing press

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuyuki Sunada 1-1-1 Kotobuki-cho, Mihara-shi, Hiroshima Prefecture Inside Mihara Rishige Engineering Co., Ltd. (72) Inventor Mihoko Furui 1-1-1 Kotobuki-cho, Mihara-shi, Hiroshima Pref. F-term (reference) 2J020 AA14 3F049 AA02 FA01 LA06 LB03 3F054 AA01 AC04 BA02 BB16 BG04 BH05 DA11

Claims (3)

[Claims] 1. A sheet discharging device for a sheet-fed printing press, in which a printing sheet conveyed after predetermined printing is dropped onto a sheet discharging table, and is applied to a sheet contacting device to align the printing sheets. A sheet discharging device for a sheet-fed printing press, comprising air blowing means configured to blow air from both sides near a paper contacting device toward a sheet center. 2. A sheet discharging device for a sheet-fed printing press according to claim 1, wherein an adjusting mechanism is provided in said air blowing means so that the amount and direction of the blown air can be appropriately adjusted. 3. A sheet discharging device for a sheet-fed printing press according to claim 2, wherein a control device for controlling said air adjusting mechanism is attached to said air pipe.