JP2002179335A - Folding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a folding device for a folder of a printing machine such as a newspaper rotary press capable of forming a sheet with a folding line having a sufficient strength without generating an end folding phenomenon in the sheet (section). SOLUTION: In this folding device provided in the folder of the printing machine to fold the sheet cut through a sawing cylinder and a folding cylinder and fed by a folding blade, plural pairs of folding rollers 8a, 8b, 9a and 9b are arranged along the transferring direction of the sheet (section), and especially, an axial length W1 of the folding rollers 8a and 8b provided in the upstream side in the sheet carrying direction is formed shorter than a sheet cross dimension W0, and an axial length W2 of the folding rollers 9a and 9b provided in the downstream side in the sheet carrying direction is formed longer than the sheet cross dimension W0, and the folding line is formed by multi-stage folding rollers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding machine for a printing press such as a newspaper rotary press. The present invention relates to a folding device for transferring a sheet to an impeller of a next process after forming a fold on the sheet.

[0002]

2. Description of the Related Art Newspaper offset rotary presses (also simply referred to as newspaper rotary presses) include web feeders, printing devices, folding machines,
It is provided with a paper discharging device for carrying out a signature formed in the folding machine to the outside. FIG. 3 is a view for explaining the configuration of a general folding machine and a paper discharging unit in a newspaper rotary press.
The folding machine 2 and the paper output unit 16 are configured as shown in FIG. 3, and the printed web 3 is continuously conveyed from the pre-process printing apparatus via a drying unit, a cooling unit, a web pass unit, and the like. After that, it is folded in two along the longitudinal direction by a triangular plate 17 provided at the entrance of the folding machine 2. Folded web 3
Next, after being rotated and transported while being held between lead-in rollers 18a and 18b, nip rollers 19a and 19b, etc. disposed below the triangular plate 17, the intermediate portion between the saw cylinder 12 and the folding cylinder 6 is further moved. Sent to.

The saw cylinder 12 is provided with a saw table 20 along the axial direction on the outer peripheral surface, and the saw table 20 has a saw-shaped saw blade 13 incorporated therein. The folding cylinder 6 has a receiving table 1 formed of an elastic body such as rubber in the axial direction as a receiving member for the saw blade 13.
4, a needle device 21 and a folding blade 10 are attached. FIG. 4 is a diagram illustrating the configuration of the saw cylinder 12 and the folding cylinder 6. As shown in FIG. 4, the saw cylinder 12 and the folding cylinder 6
The phase is set so that the base 3 and the cradle 14 mesh with each other, and are configured to rotate in synchronism with each other.

The needle 22 of the needle device 21 is attached to the tip of a needle arm 23 mounted on a needle shaft.
At a predetermined phase position during rotation in conjunction with the rotation of
It comes in and out from the outer peripheral surface. That is, needle 2
Reference numeral 2 denotes a position immediately before the sheet (newspaper) is cut by the engagement between the saw blade 13 and the cradle 14, protrudes from the surface of the folding cylinder 6, stabs at the tip of the web 3, holds the tip of the web 3, The sheet 11 is rotatably transported along the outer peripheral surface of the folding drum 6. In this way, when the sheet 11 is rotated and transferred, and the central portion of the sheet 11 approaches the position immediately above the folding device 28, the needle 22 gradually comes off, and the sheet 11 is pushed out by the folding blade 10, and the folding rollers 24a, 24b
Is pushed into the intermediate engaging portion.

[0005] A plurality of such needles 22 are provided on the outer circumference of the folding cylinder 6 (here, two sets with a 180-degree phase shift (that is, at symmetrical positions)). The web 3 is engaged with the saw blade 13 and the pedestal 14 so that the leading end of the succeeding web 3 is hooked.
Is to be cut. Next, the folding blade 10
Is fixed to a folding shaft 25 incorporated in the folding cylinder 6,
In conjunction with the rotation of the folding cylinder 6, it enters and exits from the surface of the folding cylinder 6 at a predetermined phase position during the rotation. That is, the folding blade 10 applies the sheet (newspaper) wound around the folding cylinder 6 immediately below the folding cylinder 6 to the folding roller 24 (FIG. 3).
Ref.) And folded in half at the center.

As shown in FIG. 3, the folding roller 24 is composed of two sets of rollers 24a and 24b, and holds the signature 4 (sheet 11) pressed by the folding blade 10 of the folding cylinder 6. In the state folded in the width direction,
The impeller 15 is transferred to the downstream. In addition,
In FIG. 3, reference numeral 26 denotes a guide for guiding the folded signature 4 to the impeller 15. The impeller 15 is provided with the folding roller 24 described above.
This is a device that receives the signature 4 sent out via the a and 24b and arranges the signature 4 on the discharge conveyor 5 at a desired pitch, and is configured by a plurality of blades (blades) 27.

[0007]

By the way, as described above, the conventional folding device 28 provided in the folding machine 2 has a pair of folding rollers 24a and 24b arranged along the direction in which the signature 4 is transported. It was. Therefore, there are the following problems. That is, the folding rollers 24a and 24b are not shown in FIG.
As shown in (a), the signature is formed so as to have a length that covers the entire width of the signature 4, and is set so as to form a signature with a fold in the front width. However, at high speed, Fig. 5
As shown in (b), the end of the signature 4 is broken, a so-called end-bending phenomenon, and the commercial value is reduced.

Therefore, as shown in FIG. 6A, the lengths of the folding rollers 7a and 7b in the axial direction are made shorter than the width of the signature 4 and the non-folded portions (R ) Is also used in a form in which it is configured to be folded in a state where it is left. However, in the case of the type shown in FIG. 6 described above, the lateral edges (R portions in the figure) of the signature 4 are not creased (that is, the eyes are weak), and the force for spreading in a planar manner is not obtained. When the papers are transferred to the impeller 15 or the paper discharge conveyor 5, the parallelism with respect to the paper discharge conveyor 5 and the stacking pitch are likely to vary. The state is easily disturbed.

[0009] Such irregularities in the alignment of the signatures 4 may be caused by operations in a post-process, for example, operations of gripping the paper from the discharge conveyor 5 by a chain gripper of a carrier device (not shown).
Alternatively, the operation such as stacking a predetermined number of sheets becomes unstable, which causes various troubles. If a trouble occurs, it takes time to correct the trouble, resulting in a decrease in productivity.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above-described problem. It is another object of the present invention to provide a folding device capable of ensuring sheet quality and smoothly performing post-processing of signatures.

[0011]

For this reason, the folding device of the present invention is provided in a folding machine of a printing press, and cuts a sheet cut through a saw cylinder and a folding cylinder and sent out by a folding blade. In a folding device that is folded by a pair of folding rollers,
A plurality of sets of the folding rollers are provided along the sheet transport direction, and the plurality of sets of the folding rollers form a fold in multiple stages.

As the plurality of sets of folding rollers, a first folding roller disposed upstream in the sheet transport direction and a second folding roller disposed downstream in the sheet transport direction are provided. It is preferable that the axial length of the second folding roller is formed to be longer than the sheet lateral width.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a folding device according to an embodiment of the present invention; FIG. It is a figure which shows a structure, (a) is the side view,
FIG. 2B is a front view thereof, and FIG. 2 is a diagram showing a configuration of a saw cylinder, a folding cylinder, and a folding device according to the present embodiment.
(A) is the side view, (b) is the front view. 1 and 2, the same reference numerals are given to parts and parts common to those of the conventional example (FIGS. 3 and 4).

The folding device 1 according to the present embodiment is disposed below the saw cylinder 12 and the folding cylinder 6 as shown in FIG. Except for the folding device 1, the folding machine 2 has the same configuration as the conventional example shown in FIG. That is, as shown in FIG. 3, the web 3 after printing is removed from the printing apparatus in the previous process by the drying unit,
After being continuously conveyed through a cooling section and a web path section, it is folded in two along the longitudinal direction by a triangular plate 17 provided at the entrance of the folding machine 2, and a lead-in disposed below the triangular plate 17. After being held by the rollers 18a and 18b and the nip rollers 19a and 19b and rotated and transported, it is further fed into the middle between the saw cylinder 12 and the folding cylinder 6.

As shown in FIG. 2, the saw cylinder 12 is provided with a saw table 20 along the axial direction on the outer peripheral surface, and the saw table 20 has a saw-shaped saw blade 13 incorporated therein. Further, a receiving base 14 formed of an elastic body such as rubber in the axial direction as a receiving member of the saw blade 13, a needle device 21, and a folding blade 10 are attached to the folding cylinder 6. Further, the phases of the saw cylinder 12 and the folding cylinder 6 are set so that the saw blade 13 and the receiving table 14 mesh with each other, and are configured to rotate oppositely in synchronization with each other.

The needle 22 of the needle device 21 is attached to the tip of a needle arm 23 mounted on a needle shaft.
At a predetermined phase position during rotation in conjunction with the rotation of
The needle 22 protrudes from the surface of the folding cylinder 6 at the position immediately before the sheet (newspaper) is cut by the engagement between the saw blade 13 and the cradle 14, and the tip of the web 3 comes in and out of the outer peripheral surface. The sheet 11 after cutting while holding the leading end of the web 3 is rotated and transported along the outer peripheral surface of the folding drum 6.

When the sheet 11 is thus rotated and conveyed, and the central portion of the sheet 11 approaches the position immediately above the folding device 28, the needle 22 gradually comes off, and the sheet 11 is pushed out by the folding blade 10, and the folding rollers 24a and 24b are moved. It is pushed into the intermediate engagement part. A plurality of such needles 22 are provided on the outer circumference of the folding cylinder 6 (here, two sets with a phase shift of 180 degrees (that is, at a symmetrical position)). The web 3 is cut by engaging the saw blade 13 and the pedestal 14 so that the tip of the web 3 is hooked.

Further, the folding blade 10 is fixed to a folding shaft 25 incorporated in the folding cylinder 6 and moves in and out of the folding cylinder 6 surface at a predetermined phase position during the rotation in conjunction with the rotation of the folding cylinder 6. It is supposed to. That is, the folding blade 10
Is such that a sheet (newspaper) wound around the folding cylinder 6 at a position directly below the folding cylinder 6 is pushed into a folding roller 24 (see FIG. 3) and folded in half at the center.

The folding device 1 according to the present embodiment comprises:
As shown in FIG. 1 and FIG. 2, a plurality of sets (here, two sets) are arranged below the folding cylinder 6 provided in the folding machine 2 and are arranged side by side along the transfer direction of the signature 4. Storing rollers 8a, 8
b, 9a and 9b. The axial length W1 of the upstream first folding rollers (first-stage folding rollers) 8a and 8b is formed shorter than the horizontal width dimension W0 of the web 3, and the downstream second folding roller is formed. The axial length W2 of the (second-stage folding roller) 9a, 9b is formed to be longer than the horizontal width W0 of the web 3.

Therefore, the sheet 11 cut and separated from the web 3 is once folded by the first-stage folding rollers 8a and 8b, and then folded again by the second-stage folding rollers 9a and 9b. . As shown in FIG. 1, the shafts (roller shafts) 8c of the rollers 8a, 8b, 9a, 9b,
9c is rotationally driven by the driving device 30.

The folding device according to one embodiment of the present invention includes:
Since it is configured as described above, it is printed by the printing device in the previous process, the web 3 is cut at right angles to the running direction in the folding machine 2, and is folded through the folding device 1. The sheet is transferred to the impeller 15 and is transferred and stacked in a roof tile shape on the discharge conveyor 5 in the next process. At this time, the web 3 is cut by the engagement between the saw blade 13 of the saw cylinder 12 and the cradle 14 provided on the folding cylinder 6, and then the first web is passed through the folding blade 10 provided on the folding cylinder 6. Step folding roller 8a,
After being transferred and processed between 8b, it is further transferred to the second-stage folding rollers 9a and 9b for processing.

That is, the first-stage folding rollers 8a and 8b
Then, as shown in FIG. 2B, the sheet 11 is gripped, and a fold is made in a state where the non-folded portions R are left at both width ends of the sheet 11 (temporary folding). Subsequently, the signature 4 sent out from the first-stage folding rollers 8a and 8b is sent to the second-stage folding rollers 9a and 9b on the downstream side, and completely forms a fold over the entire area in the width direction ( Book fold).

As described above, since the sheet 11 is folded in two stages and the fold is formed in a state where both width edges of the sheet 11 are left as the first stage, the sheet 11 is folded by the front and rear edges of both width edges. It is possible to fold without bending the end portion or bending deformation, and it is possible to appropriately fold a required portion without causing end bending.

Since the folds are formed in the entire width direction of the sheet 11 as the second stage, the folds can be formed more reliably. Therefore, the folds of the signature 4 become strong, and the force of the signature 4 to spread in a plane is reduced. Therefore, when the signature 4 is transferred to the impeller 15 or when the signature 4 is transferred to the discharge conveyor 5. In addition, variations in parallelism and stacking pitch with respect to the discharge conveyor 5 are less likely to occur, and the signature 4 can be easily maintained in an orderly arrangement. For this reason, troubles such as poor gripping of the carrier in the post-process are eliminated.

In the fold formation by such a multi-step (two-step) process, the fold can be formed gradually without difficulty.
1, the running posture is stable, scars are less likely to occur, and a signature 4 with good appearance (quality) can be formed. The embodiments of the present invention have been described above. However, the present invention is not limited to the embodiments, and can be variously modified and implemented without departing from the gist of the present invention.

For example, in the above-described embodiment, the folds are formed by two-stage processing. However, the folds may be formed in more stages by providing a larger number of folding rollers. In any case, at least in the first-stage folding roller, it is effective to form a fold in a state where the non-fold portions R are left at both width ends of the sheet 11 in order to prevent the end folding phenomenon. It is effective to make a fold in the entire width direction up to both width ends of the sheet 11 in order to strengthen the fold of the signature 4 and to make the signature 4 run stably.

[0027]

As described above in detail, according to the folding device of the present invention, a sheet mounted on a folding machine of a printing press, cut through a saw cylinder and a folding cylinder, and fed by a folding blade. To
Since a plurality of sets of folding rollers are provided along the transfer direction of the sheet to form a fold in multiple stages, for example, the sheet is temporarily folded by an upstream folding roller and then fully folded by a downstream folding roller. (Signature)
In order to prevent the so-called end-bending phenomenon in which the edge of the sheet is broken, the sheet is creased with sufficient strength so that the sheet can be smoothly processed in the post-process. Will be possible.

As the plurality of sets of folding rollers, a first folding roller arranged upstream in the sheet conveying direction and a second folding roller arranged downstream in the sheet conveying direction are provided. The axial length of the second folding roller is formed to be shorter than the sheet lateral width, and the axial length of the second folding roller is longer than the sheet lateral width. A fold is made in a state where a non-folded portion where no fold is made at the width direction end (so-called temporary folding), and then the fold is made by the second folding roller over the entire width direction of the sheet (origami). Since it can be attached (so-called main folding), it is possible to prevent the occurrence of edge folding on the sheet (origami) and to ensure the quality of the sheet, Post-processing It is possible to smoothly perform so.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a folding device as one embodiment of the present invention, wherein (a) is a side view and (b) is a front view.

FIG. 2 is a view showing a configuration of a saw cylinder, a folding cylinder, and a folding device according to an embodiment of the present invention, where (a) is a side view thereof;
(B) is a front view thereof.

FIG. 3 is a side view illustrating a general configuration of a folding machine and a paper discharging device in a conventional newspaper rotary press.

FIG. 4 is a side view illustrating a general configuration of a saw cylinder and a folding cylinder in a conventional newspaper rotary press.

FIG. 5 is a view for explaining a problem of a folding device mounted on a conventional newspaper rotary press, wherein (a) is a front view of the folding device;
(B) is a front view of the sheet (signature) processed by the folding device.

6A and 6B are diagrams illustrating a conventional improved folding device, wherein FIG. 6A is a front view of the folding device, and FIG. 6B is a front view of a sheet (folder) processed by the folding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Folding device 2 Folding machine 3 Web 4 Flip book 5 Paper discharge conveyor 6 Folding cylinder 7a, 7b, 24a, 24b Folding rollers 8a, 8b: First folding rollers 9a, 9b: Second folding rollers 8c, 9c: Rollers Shaft 10 Folding blade 11 Sheet 12 Saw cylinder 13 Saw blade 14 Receiving stand 15 Impeller 16 Paper ejection device 17 Triangular plate 18 Lead-in roller 19 Nipping roller 20 Saw stand 21 Needle device 22 Needle 23 Needle arm 24 Folding roller 25 Shaft 26 Id 27 Blade (blade) 28 Folding device 30 Drive device R Non-folded part

Claims (2)

[Claims] 1. A folding device equipped in a folding machine of a printing press, wherein a sheet cut through a saw cylinder and a folding cylinder and fed by a folding blade is folded by a pair of folding rollers. Is provided in a plurality of sets along the sheet transfer direction, and the plurality of sets of folding rollers are used to make folds in multiple stages. 2. A plurality of folding rollers including a first folding roller arranged upstream in a sheet conveying direction and a second folding roller arranged downstream in the sheet conveying direction. The axial length of the folding roller is formed shorter than the sheet width dimension, and the axial length of the second folding roller is formed longer than the sheet width dimension. Folding device.