JPH115657A - Web guide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a piece of paper which is cut from a web, to be surely removed at all times when a sheet of the web is fed between a cutting cylinder and a folding cylinder of the folding machine of a rotary press. SOLUTION: A guide plate 2 for guiding the travel of a web 100 in the upstream in the traveling direction of the web 100 between a cutting cylinder 117 and lower nipping rollers 115, 116, over the full length across the width of the web 100, and straightening the end part 2b in the downstream in the traveling direction of the web 100 over the full length across the width of the web 100, is provided on the cutting cylinder 117 side of the web 100 among the lower nipping rollers 115, 116, the cutting cylinder 117, and a folding cylinder 118. When the web 100 is fed up to the position right before the cutting cylinder 117 and the folding cylinder 118 and the tip side of the web 100 is removed as loss paper, the operator holds the tip side of the web 100 so that the web 100 abuts on the end part 2b of the guide plate 2, and tears the tip side of the web 100 along the end part 2b in order for the web 100 to be cut in a straight line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a web guide in a folding machine attached to a rotary printing press.

[0002]

2. Description of the Related Art A rotary printing press is generally provided with a folding machine for folding a printed web. Such folding machines include an upper nip roller and a lower nip roller that pull the web, a horizontal sewing machine cylinder that is disposed between the upper nip roller and the lower nip roller and that perforates the web, and a lower nip roller. And a cutting cylinder which is disposed downstream of the web running direction and traverses the web.

[0003] In a rotary printing press equipped with such a folding machine, when printing is started, the web is threaded to a position immediately before the cutting cylinder of the folding machine, and an operator moves the leading end side of the web by a predetermined length. After tearing and removing, the web is threaded through a trim cylinder. That is, when the web is passed between the nip rollers and the web is passed to a position immediately before the cutting cylinder of the folding machine, water droplets and the like of the cooling roller adhere to the leading end side of the web and the web is cut off. The leading end side becomes wet, and wrinkles and tears occur on the leading end side of the web during the paper threading. Therefore, the operator tears off the leading end side of the web as waste paper.

[0004]

As described above, when the operator tears off the leading end of the web, as shown in FIG.
The new tip 100a of the web 100 has an irregular shape (wavy shape)
Will be. For this reason, when the web 100 having such a tip shape is passed through the cutting cylinder and the web 100 is cut along the dotted line A by the cutting cylinder as shown in FIG. As shown, the cut web 1
Since the paper piece 101a of FIG. 00 has an integral shape, the cut paper piece 101a can be easily removed. However, if the web 100 is cut by a cutting cylinder along a dotted line B as shown in FIG. As shown in FIG.
Since the cut paper pieces 101b of the cut web 100 have a large number of fine shapes, it is difficult to remove all the cut paper pieces 101b. If printing is started with such a piece of paper 101b left behind,
There is a possibility that a problem such as a paper jam may occur.

[0005] For this reason, in a rotary printing press provided with such a folding machine, there has been a strong demand for always removing the paper pieces of the cut web reliably.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a web guide for guiding a web in a running direction, wherein a downstream end of the web in a running direction is provided in a width direction of the web. It is characterized by being linear over the entire length.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a web guide according to the present invention is provided at a predetermined position in a folding machine attached to a rotary printing press will be described with reference to FIGS. In addition, FIG.
FIG. 2 is a front view, FIG. 3 is a plan view, and FIG.

In FIG. 1, reference numeral 113 denotes a horizontal sewing machine cylinder;
4 is a horizontal sewing machine receiving cylinder, 115 and 116 are lower nip rollers, 117 is a cutting cylinder, and 118 is a folding cylinder.

Horizontal sewing machine cylinder 113 and horizontal sewing machine receiving cylinder 11
4 prevents the air from being trapped inside the folded web 100, and prevents the occurrence of folds and improves the accuracy of the folds along the running direction of the web 100. At a predetermined interval, the web 1
A perforation is made along the width direction of 00.

The lower nip rollers 115 and 116 are
Web 1 of horizontal sewing machine cylinder 113 and horizontal sewing machine cylinder 114
00, and holds the web 100 at a predetermined tension in cooperation with an upper nip roller (not shown) provided upstream of the web 100 of the horizontal sewing machine cylinder 113 and the horizontal sewing machine receiving cylinder 114 in the running direction of the web 100. You can do it.

The cutting cylinder 117 includes a lower nip roller 1
The web 100 is provided on the downstream side in the traveling direction of the web 100 and the web 100 is cut in the width direction of the web 100 at predetermined intervals along the traveling direction in cooperation with the folding cylinder 118 and received by the folding cylinder 118. It is supposed to pass.

The folding cylinder 118 is provided so as to form a pair with the cutting cylinder 117, and has a folding blade (not shown) protruding from the outer peripheral surface thereof. By lifting (protruding) the outer peripheral surface from the outer peripheral surface with a folding blade and attaching the blade portion of the paper to an adjacent gripping cylinder (not shown), the paper can be transferred to the gripping cylinder while being bent. I have.

As shown in FIGS. 1 to 3, the folding cylinder 11 of the web 100 between the horizontal sewing machine cylinder 113 and the horizontal sewing machine receiving cylinder 114 and the lower nip rollers 115 and 116.
On the side 8, a guide plate 11 for guiding the running of the web 100 over the entire length of the web 100 in the running direction has a predetermined gap in the width direction of the web 100 so that the running state of the web 100 can be checked. The guide plates 11 are provided with a plurality of mounting beams 13a, 1 fixed to a frame (not shown).
3b. These guide plates 11
Means that the upstream side in the traveling direction of the web 100 is
Is bent so as to be more distant from the web 100 on the upstream side so as to be easily received.

As shown in FIGS.
And horizontal sewing machine cylinder 114 and lower nip roller 11
5 and 116, a guide plate 12 that guides the traveling of the web 100 on the downstream side in the traveling direction of the web 100 between the cutting cylinder 117 and the guide plate 12 with the web 100 interposed therebetween. A plurality of guide plates 12 are provided with a predetermined gap in the width direction of the web 100 so as to oppose the guide plates 11, and these guide plates 12 are mounted on mounting beams 13 c fixed to a frame (not shown). . These guide plates 12 are arranged such that the upstream side in the running direction of the web 100 is more
00, and the downstream side in the running direction of the web 100 is bent further away from the web 100 toward the downstream side.

On the other hand, as shown in FIGS. 1 and 2, the lower nipping rollers 115 and 116, the cutting cylinder 117 and the folding cylinder 1
18 is provided on the folding cylinder 118 side of the web 100 between
A guide plate 1 is provided to guide the travel of 00 over the entire length of the web 100 in the width direction. The guide plate 1 is attached to an attachment beam 3a fixed to a frame (not shown). The guide plate 1 has a projection 1a formed at the upstream end of the web 100 in the traveling direction, and the projection 1a
The lower the nip roller 116 is, the more it is bent toward the upstream side in the traveling direction so as to be further away from the web 100, and is immersed in a groove (not shown) formed along the circumferential direction on the outer peripheral surface of the lower nip roller 116.

As shown in FIGS. 1 and 2, on the side of the cutting cylinder 117 of the web 100 between the lower nip rollers 115 and 116 and the cutting cylinder 117 and the folding cylinder 118, the upstream of the web 100 between them in the running direction. Near the web 100
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
Are provided, and the guide plate 2 is attached to an attachment beam 3b fixed to a frame (not shown). The guide plate 2 is a web 100
The end 2b on the downstream side in the traveling direction of the web 100 is linear over the entire length in the width direction of the web 100, and the projection 2a is formed at the upstream end of the web 100 in the traveling direction. The web 100 is bent further away from the web 100 toward the upstream side in the running direction, and is immersed in a groove 115 a formed in the outer peripheral surface of the lower nip roller 115 along the circumferential direction.

When printing is started in a rotary printing press 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. Thus, the web 100
When paper is passed through, water droplets and 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 becomes wet, and wrinkles and tears occur on the leading end side of the web 100 during the paper passing. The web 1
00 is wound up to wind up the wet portion and the damaged portion.

Next, an operator grips the wound portion on the leading end side of the web 100, and as shown in FIG.
To the end 2b of the guide plate 2,
When the web 100 is torn along the edge b, the cut surface of the web 100 is cut along the end 2b of the guide plate 2, that is, as shown in FIG. Can be

After the web 100 has been cut off in this way and the wound portion has been removed as waste paper, the web 1
00 at the new tip 100a side, the cutting cylinder 117 and the folding cylinder 11
8, the web 100 is cut by the cutting cylinder 11.
No matter what part is cut by 7, the paper piece 101a having an integral shape is always generated as shown in FIG.

Therefore, the cut piece of paper 101a can be reliably removed without being left behind, so that the occurrence of a paper jam or the like at the time of printing can be greatly reduced.

In the present embodiment, the end 2b of the guide plate 2 is merely a straight line, but it may be a straight line having a saw blade.

[0022]

In the web guide according to the present invention, since the downstream end in the running direction of the web is linear over the entire length in the width direction of the web, the web is applied to the downstream end of the web guide. If the front end side of the web is torn along the end, the web can be cut in a shape along the end of the web guide, that is, in a straight line. For this reason, if the web guide is disposed near the cutting cylinder in the folding machine attached to the rotary printing press and the upstream side of the folding cylinder in the web traveling direction, the leading end side of the web is passed between the cutting cylinder and the folding cylinder. If the web is cut off before the web is cut off, the web can be easily cut so that the new tip of the web is straight, so that when the web is passed between the cutting cylinder and the folding cylinder, No matter what part of the web the cutting cylinder cuts, a piece of paper that forms an integral shape will always be produced, so that the cut piece of paper can be reliably removed without being left behind. Can greatly reduce the occurrence of paper jams and the like.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of an embodiment when a web guide according to the present invention is provided at a predetermined location in a folding machine attached to a rotary printing press.

FIG. 2 is a front view.

FIG. 3 is a plan view.

FIG. 4 is an operation explanatory view.

FIG. 5 is a plan view of a front end of the web removed from the front end side as waste paper.

FIG. 6 is a plan view of a paper piece on the leading end side of a web cut when paper is passed between a cutting cylinder and a folding cylinder.

FIG. 7 is a plan view of a conventional leading end of a web from which the leading end has been removed as waste paper.

FIG. 8 is a plan view of a conventional paper piece on the leading end side of a web cut when 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 Projection part 2b End part 3a, 3b Mounting beam 100 Web 100a Tip 101a Paper piece 115, 116 Lower nipping roller 117 Cutting cylinder 118 Folding cylinder

Claims (1)

[Claims] 1. A web guide for guiding a web in a running direction, wherein a downstream end of the web in the running direction is linear over the entire length of the web in the width direction.