JPH1129259A - Chopper folding machine for web press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chopper folding machine for a rotary press which prevents damage to a section and increases folding accuracy and sheet delivery accuracy. SOLUTION: In a chopper folding machine for a rotary press which is provided with a pair of chopper rollers 23 opposed to each other at a specified interval by the their energization in the direction that they are moved closely to each other and a chopper blade which is inserted into a clearance between the pair of chopper rollers 23 and in which a section A is pressed between the pair of chopper rollers 23 by the chopper blade and the section A is nipped by the pair of chopper rollers 23 for chopper folding, a nip part 23N located at both ends of the outer diameter of each chopper roller 23 of the pair of chopper rollers 23 is formed in the outside diameter slightly larger than the recessed part of the other outside diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chopper folding machine for a rotary printing press, which folds a printed web into signatures and folds the web in two.

[0002]

2. Description of the Related Art A conventional chopper folding machine has a pair of chopper rollers which are urged in a direction approaching each other and are opposed to each other with a certain gap, and a chopper blade inserted between the pair of chopper rollers. The signature is inserted between a pair of chopper rollers by the chopper blade, and the signature is nipped by the pair of chopper rollers to perform chopper folding. Moreover, FIG.
As shown in (1), the outer diameter of the pair of chopper rollers 101 is the same diameter D over the entire length.

[0003]

However, since the thickness of the signature side is slightly different from the thickness of the bag side (the fold side folded by the trunk ... side folding side) and the needle side (the side with the needle hole), Nip the bag side of the chopper roller 101 (left side in FIG. 4)
The nip pressure adjustment amount of the chopper roller 101 that nips the needle side of the signature differs from the nip pressure adjustment amount of the chopper roller 101 (the right side in FIG. 4), and the pair of chopper rollers 101 is slightly inclined.

For example, assuming that the gap on the left side (head side) in FIG. 4 is a and the gap on the right side (tail side) in FIG. 4 is d, the outer diameters of the pair of chopper rollers 101 are all the same. It becomes an unstable state of sucking the Ding,
The left side (head side) in FIG. 4, the right side (butt side) in FIG.
Changes from a to b to f and c to d to e. As a result, the signature sucked by the pair of nip rollers 101 becomes oblique, turns, and falls into the impeller device provided below.

Therefore, due to the instability of suction,
Folding accuracy is deteriorated, and damage such as scratches, rubs, and damage is caused, resulting in defective products. In addition, since the paper is obliquely dropped onto an impeller device provided below, the accuracy of paper discharge deteriorates, and paper jams occur in a paper discharge table, a stacker, or a bundler used in a subsequent subsequent process.

SUMMARY OF THE INVENTION An object of the present invention is to provide a chopper folder for a rotary printing press which prevents damage to a signature and improves the folding accuracy and paper ejection accuracy.

[0007]

In order to achieve the above object, a chopper folding machine for a rotary printing press according to the present invention according to claim 1 is urged in a direction approaching each other and opposed to each other at a certain gap. Chopper roller, and a chopper blade inserted between the pair of chopper rollers. The signature is pushed between the pair of chopper rollers by the chopper blade, and the signature is nipped by the pair of chopper rollers. In a chopper folding machine of a rotary printing press that performs folding, two nip portions at both ends of the pair of chopper rollers at both ends of the outer diameter of the chopper roller are formed with outer diameters slightly larger than relief portions of other outer diameters. It is characterized by having.

Therefore, the signature is pushed between the pair of chopper rollers by the chopper blade, and the pair of chopper rollers nips the signature to perform chopper folding.

[0009] The nip adjustment can be easily performed because the nip portion at the two ends of the outer diameter of each chopper roller of the pair of chopper rollers is formed with an outer diameter slightly larger than the relief portion of the other outer diameter. Since the signature is also dropped straight, the signature is not broken and the signature is prevented from being damaged. Thus, the folding accuracy is improved and the paper ejection accuracy is also improved.

According to a second aspect of the present invention, there is provided a chopper folding machine for a rotary printing press according to the first aspect of the present invention, wherein two nip portions at both ends of the outer diameter of the chopper roller are provided with a signature. About 20mm inside about 20mm from both ends
It is characterized in that the outer diameter is about 0.15 mm larger than the outer diameter of the relief part of the other outer diameter as well as the width.

Therefore, the same operation as in the first aspect is performed, and the signature is further prevented from being damaged, so that the folding accuracy and the sheet discharging accuracy are further improved.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIGS. 2 and 3, a chopper folding machine 1 includes a former 3 for vertically folding a web W;
A cylinder-type horizontal folding device 11 including a cutting cylinder 5, a ramming cylinder 7, and a biting cylinder 9; a transport belt device 13 for horizontally transporting the signature A cut and laterally folded by the cylinder-type horizontal folding device 11; A chopper folding device 17 that is horizontally conveyed by the belt device 13 and stopped by the stopper 15 to chopper-fold the signature A. The signature A that has been chopper-folded by the chopper folding device 17 is conveyed at a high speed and received by the impeller device 19, and then the impeller device 1
The paper is discharged at regular intervals on a paper discharge conveyor 21 provided below the printer 9.

As shown in FIG. 2, the chopper folding device 17 includes a pair of chopper rollers 23 and a chopper blade 2 inserted between the pair of chopper rollers 23.
5 is provided. The chopper blade 25 is supported by a chopper arm 29 of a chopper shaft 27.

The chopper shaft 27 is drivingly connected to a driving disk 33 by a crank arm 31. The driving disk 33 is reciprocally rotated by being driven to rotate by the folding machine body. Thereby, the chopper blade 25 reciprocates vertically in a relatively large arc with the chopper shaft 27 as an axis, and is inserted between the pair of chopper rollers 23.

The chopper rollers 23 are rotatably supported by bearing members 37 urged in directions approaching each other by springs 35, and are rotated by the folding machine body in synchronization with the vertical movement of the chopper blade 25.

As shown in FIG. 1, the pair of chopper rollers 23 has two nip portions 2 at both ends 23A.
3N is formed with an outer diameter (diameter D ₁ ) slightly larger than the other outer diameter portions (diameter D ₀ ). More specifically, the signature A has a width L, and is approximately 20 mm from both ends of the width L.
A nip 23N having a width of about 20 mm is formed from this point. The diameter D ₁ is about 0 for example than the diameter D _0.
It is about 15 mm larger. Note that the above numerical data is obtained from the results of various experiments.

With the above configuration, the nip 23N is located at both ends of the nip roller 23 and has a narrow width of about 20 mm, so that the nip can be easily adjusted, and the signature A falls straight. In addition, the outer diameter of the relief portion 23B is, for example, about 0.15.
mm, which is smaller than the nip portion 23N, thereby preventing the occurrence of a problem due to a difference in right and left pressing at the central portion of the signature A, without pressing the signature A moderately and rubbing the signature A with the nip portions 23N at both ends. Can firmly nip.

Therefore, when the signature A is sucked between the chopper rollers 23, the signature A does not become skewed, so that the folding accuracy is good and the damage such as scratches, rubbing, and damage is prevented. Can be. At the same time, the paper falls down in parallel with the impeller device 19 provided below the signature A, so that paper jam does not occur in a paper discharge stand, a stacker or a bundler used in the next subsequent process, and the paper discharge accuracy is improved. Can be planned.

The present invention is not limited to the above-described embodiment of the present invention, but can be embodied in other forms by making appropriate changes.

[0021]

As will be understood from the above description of the embodiment of the invention, according to the first aspect of the present invention, the signature is pushed between a pair of chopper rollers by a chopper blade, and the pair of choppers is pushed. The chopper is folded by nipping the signature with rollers.

The nip adjustment is facilitated by the fact that the nip portion at the two outer end portions of each chopper roller of the pair of chopper rollers is formed with an outer diameter slightly larger than the relief portion of the other outer diameter. Since the signature can be dropped straight, the signature can be prevented from being broken and the signature can be prevented from being damaged. Thus, it is possible to improve the folding accuracy and also improve the paper ejection accuracy.

According to the second aspect of the invention, the same effect as in the first aspect can be obtained, and the signature can be further prevented from being damaged, so that the folding accuracy and the paper discharging accuracy can be further improved. Can be.

[Brief description of the drawings]

FIG. 1 is a plan view of a pair of chopper rollers, showing a main part of the present invention.

FIG. 2 is a front view of a chopper folding machine embodying the present invention.

FIG. 3 is an enlarged view as viewed from an arrow III in FIG. 2;

FIG. 4 is a plan view of a conventional pair of chopper rollers.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chopper folding machine 17 Chopper folding device 19 Impeller device 21 Discharge conveyor 23 Chopper roller 23N Nip part 25A Both ends 23B Relief part 25 Chopper blade 35 Spring A signature

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[Procedure amendment]

[Submission date] July 25, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

For example, assuming that the gap on the left side (head side) in FIG. 4 is a and the gap on the right side (tail side) in FIG. 4 is d, the outer diameters of the pair of chopper rollers 101 are all the same. It becomes an unstable state of sucking the Ding,
The left side (head side) in FIG. 4, the right side (butt side) in FIG.
Changes from f to a and b to c to d to e. As a result, the signature sucked by the pair of nip rollers 101 becomes oblique, turns, and falls into the impeller device provided below.

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

Claims (2)

[Claims] A pair of chopper rollers which are urged in a direction approaching each other and are opposed to each other with a certain gap therebetween; and a chopper blade inserted between the pair of chopper rollers. In the chopper folding machine of a rotary printing press, which presses between the pair of chopper rollers and nips a signature by the pair of chopper rollers to perform chopper folding, the outer diameter end portions 2 of the respective chopper rollers in the pair of chopper rollers A chopper folder for a rotary printing press, characterized in that the nip portion at each of the locations has an outer diameter slightly larger than the relief portion of the other outer diameter. 2. The nip portion at two locations at both ends of the outer diameter of the chopper roller is about 20 mm inward from both ends of the signature.
2. The chopper folding machine for a rotary printing press according to claim 1, wherein the outer diameter is about 0 mm wide and about 0.15 mm larger than the outer diameter of the relief part of the other outer diameter.