JP4644325B2 - A method for sucking and conveying printing paper in a sheet-fed printing press and its paper discharge mechanism - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a sheet discharge mechanism in a sheet-fed printing machine, and more particularly to a sheet discharge method for discharging sheet-fed printing paper in which a print sheet bitten by a gripper is sucked and transported to a sheet stack and the sheet discharge mechanism.
[0002]
[Prior art]
As a conventional paper discharge device, the top of the paper is held by the gripper and conveyed to the top of the paper discharge stand, the gripper releases the paper, and when the paper falls, the air shower device blows air from above the paper. It is known that the paper bottom is configured to be sucked and advanced by a vacuum wheel that is driven to rotate and discharged. In addition, there is also known a configuration in which a fan motor is installed above the position of the air shower, that is, above the paper discharge table so that the paper is brought into close contact with the paper guide.
[0003]
An apparatus as shown in FIGS. 4 and 5 is disclosed in Japanese Utility Model Publication No. 4-3800 as an improvement of these conventionally known paper discharge apparatuses. As shown in FIG. 4, this paper discharge device is a device comprising an air shower device and a vacuum wheel. A fan motor is installed above the paper guide, and air flows out from the top of the paper guide. As a result, there is no accumulation of air, so that the paper can be securely adhered to the paper guide, and the paper can be prevented from flickering to stabilize the paper discharge.
[0004]
Such a conventionally known paper discharge device has caused printing troubles such as scratches on the printed surface on the back side by using such air particularly in the case of duplex printing.
[0005]
[Problems to be solved by the invention]
The problem to be solved by the present invention is to further solve the conventional problem by further improving the paper discharge mechanism in the conventional sheet-fed printing press improved by the applicant of the present application.
[0006]
[Means for Solving the Problems]
The present invention has been developed to solve the above-described problems, and in a paper discharge method in a sheet-fed printing machine that sucks and conveys printing paper bitten by a gripper to a paper stack, a delivery chain guide is provided. While gradually lowering the gripper in the traveling direction, the printing paper bitten by the gripper is sucked and conveyed to the paper stack at a high speed and continuously, and when the gripper passes over the suction wheel, When a slight gap is secured between the suction wheel and the suction wheel, the gap between the suction wheel and the printing paper is eliminated immediately before the suction wheel sucks the printing paper, and the gripper releases the printing paper. The printing paper is pushed down by the wind pressure caused by the gripper running, and the relationship between the gap S between the gripper and the suction wheel, the distance L between the gripper and the suction wheel, and the inclination angle α ° of the printing paper is α °. = Ta ^-1 holds the relationship of ^{S /} L, is configured as the trailing of the printing paper in the molded elevational relationship is the inclination angle of approximately α ° = 0.5 ° ~10 ° to somewhat upwardly from the horizontal A method of sucking and conveying printing paper in a sheet-fed printing machine, further sucking and conveying printing paper bitten by a gripper to a paper stacking platform, and feeding a chain guide wound around a delivery cylinder. It is attached with a slight inclination angle with respect to the paper contact direction of the loading platform, and the chain guide is gradually lowered with respect to the traveling direction of the gripper of the printing paper by the inclination of the chain guide, and is conveyed by suction. In order to secure a slight gap between the gripper and the suction wheel when passing over, the gap between the suction wheel and the printing paper is eliminated immediately before the suction wheel sucks the printing paper. , The gripper In the when to push down the printing paper in wind pressure caused by traveling of the gripper, relationship between the distance L and the inclination angle alpha ° printing paper and the clearance S the gripper and the suction wheel of the gripper and the suction wheel The relationship of α ° = tan ⁻¹ S / L is established, and in this relationship, the inclination angle of α ° = 0.5 ° to 10 ° is set so that the bottom side of the printing paper is slightly upward from the horizontal. The present invention provides a printing paper discharge mechanism in a sheet-fed printing machine.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
According to an embodiment of the present invention, in a sheet discharge method for a sheet-fed printing machine that sucks and conveys printing paper bitten by a gripper to a paper stack, a delivery chain guide is gradually lowered with respect to the traveling direction of the gripper. However, the printing paper bitten by the gripper is sucked and conveyed to the paper stack at high speed and continuously, and when the gripper passes over the suction wheel, a slight gap is secured between the gripper and the suction wheel. the suction wheel is such that without a gap between the printing paper and the suction wheel just before adsorbing the printing paper, a printing paper with wind pressure by running of the gripper when the gripper releases the printing paper A method of sucking and transporting printing paper, characterized in that it is pushed down. Further, in the relationship between the gap S between the gripper and the suction wheel, the distance L between the gripper and the suction wheel, and the inclination angle α ° of the printing paper. α ° = ta ^-1 holds the relationship of ^{S /} L, configured as trailing the printing paper in the molded elevational relationship is the inclination angle of approximately α ° = 0.5 ° ~10 ° to somewhat upwardly from the horizontal Since the printing paper is sucked and conveyed, since the printing paper is configured to be gradually lowered, the suction wheel can stably and reliably suck the bottom of the printing paper.
[0008]
In the embodiment of the present invention, a chain guide wound around a delivery cylinder in a paper discharge mechanism in a sheet-fed printing machine that sucks and conveys printing paper bitten by a gripper to the paper stacking board is used as a paper holder for the paper stacking board. This is a printing paper discharge mechanism that is attached with a slight inclination angle with respect to the direction, and is gradually lowered with respect to the running direction of the printing paper gripper by the inclination of the chain guide. Since it is run with its tip lowered, it is never hit when the paper is released.
[0009]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
The present invention is an improvement of the paper discharge device in the sheet-fed printing press shown in FIG. 4, and its basic structure is substantially the same, so only the features of the present invention will be described below.
[0010]
First, as shown in FIG. 1, the paper discharge mechanism main body 1 is attached to the paper discharge mechanism main body 1 in such a manner that the chain guide 3 mounted on the delivery cylinder 2 is inclined with respect to the direction 7 of the paper stack 6. It has been. By attaching the paper discharge mechanism main body 1 in this state, the gripper 5 attached to the chain 4 is inclined downward, so that the printing paper P bitten by the gripper 5 via the suction wheel 8 faces downward. Thus, the paper can be stably and reliably stacked on the paper tray 7 of the paper stack 6.
[0011]
Next, the relationship will be further described with reference to FIG. 2. First, when the gripper 5 passes over the suction wheel 8, the gripper 5, the suction wheel 8, and the conventional mechanism (b 1) and the present invention (a 1) Although it is possible to secure a slight gap between, between the conventional mechanism becomes a state immediately before the next suction wheel 8 adsorbs the print paper P (b2) to the print paper P and the suction wheel 8 for it is press down the printing paper P by the air source such as a fan or a nozzle to the gap occurs, the gap between the case of the present invention mechanism (a2) in the printing paper P and the suction wheel 8 does not occur The suction wheel 8 can stably and reliably convey the printing paper P and convey it. Further, when the gripper 5 releases the printing paper P, in the case of the conventional mechanism (b3), the air source (fan, nozzle, etc.) pushes the printing paper P in the direction of rising due to the wind pressure caused by the traveling of the gripper 5. would lower the gel, but the wind pressure by running if (a3) in the gripper 5 of the present invention mechanism can be justified stable and reliable Naru paper so acts in a direction to push down the printing paper P.
[0012]
Further, FIG. 3 explains the principle that enables stable suction conveyance of the printing paper P by tilting the discharge mechanism main body 1 which is a feature of the present invention mechanism. First, S: a gap between the suction wheel and the gripper (printing paper) Head)
L: Distance between suction wheel and gripper α °: Inclination angle of printing paper The following method is established.
[0013]
α ° = tan ^-1 S / L
Therefore, the following inclination angle is most desirable in order for the bottom side of the printing paper to be slightly upward from the horizontal.
α ° = 0.5 ° -10 °
As described above, in the paper discharge method of the conventional mechanism, a special technique is required for adjusting the air pressure in order to push down the printing paper by the air source (fan, nozzle, etc.). Although the paper alignment is poor, the paper discharge method of the mechanism of the present invention can provide a good paper alignment.
[0014]
【The invention's effect】
The present invention relates to a paper discharge method in a sheet-fed printing machine that sucks and conveys printing paper bitten by a gripper to a paper stack, while the delivery chain guide is gradually lowered with respect to the traveling direction of the gripper. Is a method for sucking and transporting printing paper in a sheet-fed printing machine, wherein the gripper passes over the suction wheel. sometimes when the gripper without a gap between the printing paper and the suction wheel is immediately before the suction wheel securing some clearance between the gripper and the suction wheel adsorbs printing paper releases the printing paper a suction conveying method for a printing paper in sheet-fed printing press depressing the printing paper in wind pressure caused by traveling of the gripper, also the inclination of the print paper and the distance L between the gap S and the gripper and the suction wheel of the gripper and the suction wheel Degree alpha holds the relationship of α ° = tan -1 S ^{/ L} in relation to the °, for trailing the printing paper somewhat upwardly from the horizontal in the molded elevational relationship α ° = 0.5 ° ~10 ° This is a method for sucking and conveying printing paper in a sheet-fed printing machine configured to have an inclination angle of about a degree, and further a paper discharge mechanism in a sheet-fed printing machine that sucks and conveys printing paper bitten by a gripper to a paper stack The chain guide wound around the delivery cylinder is attached with a slight inclination angle with respect to the paper contact direction of the paper stack, and gradually descends with respect to the printing paper gripper traveling direction due to the inclination of the chain guide Since the printing paper discharge mechanism in the sheet-fed printing press is characterized in that it is sucked and conveyed, it has the following many advantages over the conventional paper discharge mechanism. A) By improving the conventional paper discharge mechanism like the mechanism of the present invention, a stable and reliable suction conveyance method and mechanism that cannot be obtained by the conventional mechanism can be obtained. In the same manner, since the leading edge of the printing paper is inclined, the smearing phenomenon that occurred when the paper was released while traveling was completely eliminated. C, further according to the present invention, it is aligned paper is stable because acting on press under gel direction printing paper with wind pressure by running the gripper.
[Brief description of the drawings]
FIG. 1 is an explanatory schematic diagram showing a delivery unit which is a main part of a paper discharge mechanism according to the present invention.
FIG. 2 is a partially enlarged explanatory view showing a suction conveyance mechanism for printing paper, which is a main part of the present invention, in comparison with a conventional mechanism.
FIG. 3 is an explanatory schematic diagram illustrating the principle of suction conveyance of printing paper, which is a main part of the present invention.
FIG. 4 is an explanatory schematic diagram illustrating a conventional paper discharge device.
FIG. 5 is an explanatory schematic diagram showing a sheet-fed printing press used in the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Paper discharge mechanism body 2 Delivery cylinder 3 Chain guide 4 Chain 5 Gripper 6 Paper stack 7 Paper tray 8 Suction car P Printing paper

Claims (2)

In a sheet discharge method for sucking and transporting a printing paper bitten by a gripper to a paper stack, the gripper bites while gradually lowering a delivery chain guide with respect to the traveling direction of the gripper. The printing paper is sucked and conveyed to the paper stack at a high speed and continuously, and when the gripper passes over the suction wheel, a slight gap is secured between the gripper and the suction wheel, and the suction wheel prints. Immediately before adsorbing the paper, the gap between the suction wheel and the printing paper is eliminated, and when the gripper releases the printing paper, the printing paper is pushed down by the wind pressure caused by the traveling of the gripper. The relationship of α ° = tan ⁻¹ S / L is established in the relationship among the clearance S between the suction wheel, the distance L between the gripper and the suction wheel, and the inclination angle α ° of the printing paper. Ass A method for sucking and conveying printing paper in a sheet-fed printing machine, characterized in that the side is slightly upward from the horizontal and has an inclination angle of about α ° = 0.5 ° to 10 ° . In the paper discharge mechanism of a sheet-fed printing machine that sucks and conveys the printing paper bitten by the gripper to the paper stack, the chain guide wound around the delivery cylinder is slightly inclined with respect to the paper contact direction of the paper stack. It is attached with a corner, and is gradually lowered with respect to the traveling direction of the gripper of the printing paper by the inclination of the chain guide, and sucked and conveyed. When the gripper passes over the suction wheel, the gripper and the suction wheel When the gripper releases the printing paper so as to eliminate a gap between the suction wheel and the printing paper immediately before the suction wheel sucks the printing paper so as to secure a slight gap therebetween, the gripper of the press down the printing paper in the wind pressure by running, the gripper and the suction wheel and the gap S between the gripper and the in relation to the distance L between the suction wheel and the tilt angle alpha ° of printing paper alpha ° = ta ^-1 holds the relationship of ^{S /} L, is configured as the trailing of the printing paper in the molded elevational relationship is the inclination angle of approximately α ° = 0.5 ° ~10 ° to somewhat upwardly from the horizontal A printing paper discharge mechanism in a sheet-fed printing press.

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