JP3782207B2 - Rotary printing press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary printing press provided with a folding machine .
[0002]
[Prior art]
A rotary printing machine is generally provided with a folding machine for folding a printed web. Such a folding machine includes an upper nipping roller and a lower nipping roller for pulling the web, a horizontal sewing cylinder disposed between the upper nipping roller and the lower nipping roller and placing a horizontal perforation on the web, and a lower nipping roller. A cutting cylinder is provided on the downstream side of the web running direction to cut the web horizontally.
[0003]
In a rotary printing press equipped with such a folding machine, when printing is started, the web is passed through to the position immediately before the cutting cylinder of the folding machine, and an operator tears the leading end side of the web for a predetermined length. After removal, the web is passed through a cutting cylinder. That is, when the web is passed between the nipping rollers and the web is passed to the position just before the cutting cylinder of the folding machine, water droplets or the like of the cooling roller adhere to the front end side of the web, and the web Since the leading end side gets wet and the web is threaded, the leading end side of the web is wrinkled or torn, so the operator tears the leading end side of the web as waste paper.
[0004]
[Problems to be solved by the invention]
As described above, when the operator tears off the front end side of the web, as shown in FIG. 7, the new front end 100a of the web 100 becomes an indefinite shape (wave shape). Therefore, when the web 100 having such a tip shape is passed through the cutting cylinder, as shown in FIG. 7, when the web 100 is cut along the dotted line A by the cutting cylinder as shown in FIG. As shown in FIG. 7, since the cut paper piece 101a of the cut web 100 has an integral shape, the cut paper piece 101a can be easily removed, but the web 100 is cut along the dotted line B as shown in FIG. 8b, as shown in FIG. 8B, the cut paper piece 101b of the web 100 has a large number of fine shapes, making it difficult to remove all the cut paper pieces 101b. End up. If printing is started with such a piece of paper 101b left behind, a problem such as a paper jam may occur.
[0005]
For this reason, in a rotary printing press provided with such a folding machine, it has been strongly required to always remove the cut pieces of the cut web.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, a rotary printing press according to the present invention is a rotary printing press provided with a folding machine having a cutting cylinder that cuts a web over a width direction of the web at a predetermined interval along a running direction. A lower nipping roller disposed upstream of the cutting cylinder in the folding machine in the running direction of the web, and disposed between the cutting cylinder and the lower nipping roller in the folding machine, and running the web in the running direction. And the downstream end in the running direction of the web is cut to the full length in the width direction of the web so that the front end side of the web passed to the position immediately before the cutting cylinder can be cut along the width direction of the web. over characterized in that it comprises a web guide which forms a linearly.
In the rotary printing machine, a protrusion that bends away from the web toward the upstream side in the traveling direction of the web is formed at an upstream end of the web guide in the traveling direction of the web.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a rotary printing press according to the present invention will be described with reference to FIGS. 1 is a side view of the main part, FIG. 2 is a front view, and FIG. 3 is a plan view.
[0008]
In FIG. 1, 113 is a horizontal sewing machine cylinder, 114 is a horizontal sewing machine cylinder, 115 and 116 are lower nipping rollers, 117 is a cutting cylinder, and 118 is a folding cylinder.
[0009]
The horizontal sewing machine drum 113 and the horizontal sewing machine drum 114 are capable of preventing air from being trapped inside the folded web 100, preventing the occurrence of creases and improving the accuracy of the folds. The perforation is made along the width direction of the web 100 at a predetermined interval along the running direction of the web 100.
[0010]
The lower nipping rollers 115 and 116 are provided on the downstream side in the running direction of the web 100 of the horizontal sewing machine drum 113 and the horizontal sewing machine drum 114, and are provided on the upstream side of the horizontal sewing drum 113 and the horizontal sewing machine drum 114 in the running direction of the web 100. The web 100 can be held at a predetermined tension in cooperation with the upper nipping roller (not shown).
[0011]
The cutting cylinder 117 is provided downstream of the lower nipping rollers 115 and 116 in the traveling direction of the web 100, and cooperates with the folding cylinder 118 to move the web 100 in the width direction of the web 100 at predetermined intervals along the traveling direction. The sheet is cut and transferred to the folding cylinder 118.
[0012]
The folding cylinder 118 is provided so as to make a pair with the cutting cylinder 117, and a folding blade (not shown) is provided on the outer peripheral surface of the folding cylinder 118. A central portion (folded portion) of the paper received from the cutting cylinder 117 is formed by the folding blade. By lifting (protruding) from the outer peripheral surface and holding the blade portion of the paper in the adjacent holding cylinder (not shown), the paper can be delivered to the holding cylinder while being folded.
[0013]
1 to 3, the web 100 between the horizontal sewing machine cylinder 113, the horizontal sewing machine cylinder 114 and the lower nipping rollers 115, 116 is on the folding cylinder 118 side, and the web 100 runs between them. A plurality of guide plates 11 that guide the travel of the web 100 over the entire length in the direction are provided with a predetermined gap in the width direction of the web 100 so that the travel state of the web 100 can be confirmed. Are attached to attachment beams 13a and 13b fixed to a frame (not shown). These guide plates 11 are bent away from the web 100 toward the upstream side so that the upstream side in the running direction of the web 100 can easily receive the web 100.
[0014]
As shown in FIGS. 1 to 3, the web 100 between the horizontal sewing machine drum 113 and the horizontal sewing machine drum 114 and the lower nipping rollers 115, 116 is disposed downstream of the web 100 in the traveling direction. A plurality of guide plates 12 that guide the travel of the web 100 closer to the web 100 are disposed with a predetermined gap in the width direction of the web 100 so as to face the guide plate 11 with the web 100 interposed therebetween. These guide plates 12 are attached to an attachment beam 13c fixed to a frame (not shown). The guide plates 12 are bent so that the upstream side in the running direction of the web 100 can easily receive the web 100 so that the upstream side is away from the web 100, and the downstream side in the running direction of the web 100 is separated from the web 100 as the downstream side. It is bent like so.
[0015]
On the other hand, as shown in FIGS. 1 and 2, the web 100 between the lower nipping rollers 115, 116 and the cutting cylinder 117 and the folding cylinder 118 is closer to the upstream side in the running direction of the web 100. A guide plate 1 for guiding the travel of the web 100 over the entire length in the width direction of the web 100 is provided, and the guide plate 1 is attached to an attachment beam 3a fixed to a frame (not shown). The guide plate 1 has a protrusion 1a formed at the upstream end in the running direction of the web 100. The projection 1a is bent away from the web 100 toward the upstream in the running direction of the web 100, and The nipping roller 116 is immersed in a groove (not shown) formed along the circumferential direction on the outer peripheral surface of the nipping roller 116.
[0016]
As shown in FIGS. 1 and 2, the web 100 between the lower nipping rollers 115, 116 and the cutting cylinder 117 and the folding cylinder 118 is on the side of the cutting cylinder 117, the upstream side of the web 100 in the running direction. A guide plate 2 which is a web guide according to the present invention for guiding the travel of the web 100 over the entire length in the width direction of the web 100 is provided, and the guide plate 2 is attached to a mounting beam 3b fixed to a frame (not shown). It is attached. In the guide plate 2, an end 2 b on the downstream side in the running direction of the web 100 forms a straight line over the entire length in the width direction of the web 100, and a protrusion 2 a is formed at the upstream end in the running direction of the web 100. The protrusion 2a bends away from the web 100 toward the upstream side in the running direction of the web 100, and enters the groove 115a formed along the circumferential direction on the outer peripheral surface of the lower nipping roller 115. ing.
[0017]
When printing is started in a rotary printing machine provided with a folding machine having such a guide plate 2, first, the web 100 is threaded to a position immediately before the cutting cylinder 117 and the folding cylinder 118. When the web 100 is threaded in this way, water droplets or the like of the cooling roller adhere to the leading end side of the web 100 and the leading end side of the web 100 gets wet, and the leading end side of the web 100 is wrinkled during the threading. Since the web 100 is unwound, the wet portion and the damaged portion are wound up.
[0018]
Next, the operator grasps the winding portion on the leading end side of the web 100, and as shown in FIG. 4, the web 100 is applied to the end 2b of the guide plate 2 so as to be along the end 2b. When the web 100 is torn, the cutting end surface of the web 100 is cut along the end 2b of the guide plate 2, that is, as shown in FIG.
[0019]
After the web 100 is cut in this way and the winding portion is removed as waste paper, the web 100 is cut when the new leading end 100a side of the web 100 is passed between the cutting cylinder 117 and the folding cylinder 118. As shown in FIG. 6, a piece of paper 101 a having an integral shape is always generated regardless of where the drum 117 is cut.
[0020]
Therefore, the cut paper piece 101a can be surely removed without leaving, so that the occurrence of paper jam or the like during printing can be greatly reduced.
[0021]
In the present embodiment, the end portion 2b of the guide plate 2 is merely a straight line, but it may be a straight line having a saw blade shape.
[0022]
【The invention's effect】
In the rotary printing press according to the present invention , when the leading end side of the web is removed as waste paper prior to passing the paper between the cutting cylinder and the folding cylinder, the web is cut so that the new leading end of the web becomes a straight line. Therefore, when the paper is passed between the cutting cylinder and the folding cylinder of the web, a piece of paper having an integral shape is always generated regardless of where the cutting cylinder cuts the web. As a result, the cut pieces of paper can be reliably removed without leaving them, and the occurrence of paper jams or the like during printing can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a side view of an essential part of an embodiment of a rotary printing press according to the present invention.
FIG. 2 is a front view.
FIG. 3 is a plan view.
FIG. 4 is an operation explanatory diagram.
FIG. 5 is a plan view of the front end of the web removed with the front end side as waste paper.
FIG. 6 is a plan view of a piece of paper on the leading end side of the web cut when the paper is passed between the cutting cylinder and the folding cylinder.
FIG. 7 is a plan view of a conventional tip of a web with the tip side removed as waste paper.
FIG. 8 is a plan view of a conventional paper piece on the front end side of a web cut when a paper is passed between a cutting cylinder and a folding cylinder in a folding machine attached to a rotary printing press.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Guide plate 2 Guide plate 2a Protrusion part 2b End part 3a, 3b Attachment beam 100 Web 100a Tip 101a Paper piece 115,116 Lower nipping roller 117 Cutting cylinder 118 Folding cylinder

Claims (2)

In a rotary printing press provided with a folding machine having a cutting cylinder for cutting a web over the width direction of the web at a predetermined interval along the running direction,
A lower nipping roller disposed upstream of the cutting cylinder in the folding machine in the running direction of the web;
The webbing is disposed between the cutting cylinder and the lower nipping roller in the folding machine, guides the web in the running direction, and the downstream end of the web in the running direction passes to a position just before the cutting cylinder. the web of the distal so as to be cut along the width direction of the web, a rotary printing press, characterized by comprising a web guide which forms a straight line across the width direction entire length of the web. In claim 1,
A rotary printing press, wherein a protrusion that bends away from the web toward the upstream side in the running direction of the web is formed at an upstream end of the web guide in the running direction of the web.

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