JP2003146535A - Folding machine for rotary press and method for setting timing of web cutting and needle drawing in folding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve folding accuracy of a web while controlling a web edge crease, wrinkle or the like. SOLUTION: Relative positions of folding body 8 and a saw body 7 are set to complete cut of a web 3 before a folding blade 13 starts folding operation of the web 3, the needle 12 is removed from the web 3 after the folding blade 13 starts the folding action of the web 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folder for a rotary press and a method for setting a web cutting timing.

[0002]

2. Description of the Related Art FIG. 6 conceptually shows an example of a folder 1 of an offset rotary press for newspapers. In this folding machine 1, a plurality of laminated printed webs are fed to a triangular plate 4 via a drag roller 2, and the triangular web 4 causes the laminated web to move in a vertical direction, that is, in a traveling direction of the webs. Folded. And this folded web 3
Are lead-in rollers 5, 5 and nipping rollers 6, 6
And the like, and then sent between the saw cylinder 7 and the folding cylinder 8.

As shown in FIG. 7, the saw cylinder 7 has a double cylinder structure, and on its outer peripheral surface, two saw blades 10 supported by a saw base 9 are located at symmetrical positions about their axes. It is installed in. Further, the folding cylinder 8 that rotates in synchronization with the saw cylinder 7 has a triple cylinder structure and pierces the web 3 with three saw blade receivers 11 having a function as a receiving member of the saw blade 10. And three needles 12 for conveying the web 3,
3 for folding the central part of the web 3 cut by the saw blade 10
The individual folding blades 13 are attached at an angular interval of 120 °.

The needle 12 is attached to the tip of a needle arm 12b assembled to the needle shaft 12a. The needle 12 and the folding blade 13 move in and out of the peripheral surface of the folding cylinder 8 at a predetermined rotational phase position of the folding cylinder 8.

The operation of the saw cylinder 7 and the folding cylinder 8 in the conventional rotary press will be described below with reference to FIGS. FIG. 7 shows a state in which the leading end of the web 3 is moved to a position immediately before a predetermined needle pull-out position by the counterclockwise rotation of the folding cylinder 8. When the folding cylinder 8 is further rotated from this state and the needle 12 is moved to the needle pulling position, the needle 1
2 is pulled out from the leading end of the web 3 and the restraint at the leading end is released. The needle 12 is projected and retracted from the peripheral surface of the folding cylinder 8 by the rotation of the needle arm 12b around the shaft 12a.

FIG. 8 shows the state in which the folding cylinder 8 is rotated until the saw blade 10 of the saw cylinder 7 approaches the saw blade receiver 11 of the folding cylinder 8. Thereafter, when the saw blade 10 contacts the saw blade receiver 11 of the folding cylinder 8, the web 3 is cut and the rear end of the web 3 corresponding to the leading end is formed. In the state of FIG. 8, the tip of the folding blade 13 is rotationally moved to a position on the circumferential surface of the folding cylinder 8, that is, to a position where it abuts on the web 3. Therefore,
The folding blade 13 pushes the web 3 toward the folding roller 14 by the clockwise rotation of the folding blade 13 accompanying the rotation of the folding cylinder 8. And folding blade 1
When the folding cylinder 8 rotates until the projection 3 extends from the circumferential surface of the folding cylinder 8 by a predetermined length, the web 3 is folded by the folding blade 13 between the folding rollers 14 and 14 and is perpendicular to the plane of FIG. It is folded in two along the straight line.

With the subsequent rotation of the folding cylinder 8, as shown in FIG. 9, the folding blade 13 protrudes most, and then the folding blade 13 shown in FIG.
As shown in, the tip of the folding blade 13 moves to the position of the peripheral surface of the folding cylinder 8. Then, when the folding cylinder 8 is rotated to the state of FIG. 11, the signature 18 is formed by the folded web 3.
Is formed. The signature 18 is placed on the discharge conveyor 20 by the impeller 19 shown in FIG.

[0008]

By the way, as described above, in the conventional rotary press, the needle 12 is fed from the leading end of the web 3.
After the web is removed, the web 3 is folded between the folding rollers 14 and 14 by the folding blade 13. Therefore, when the web 3 is folded, the leading end of the web 3 may flutter, and the leading end may be broken or wrinkled. Further, when the web 3 is folded, the leading end position of the web 3 moves to the folding rollers 14, 14 side,
The folding position of the web 3 deviates from the central position of the web 3, that is, the folding accuracy decreases.

The present invention has been made in view of the above circumstances, and suppresses edge breakage, wrinkles and the like of the web, and
An object of the present invention is to provide a folder for a rotary press that can improve the folding accuracy of the web, and a method for setting the timing of cutting the web and the timing of removing the needle in the folder.

[0010]

SUMMARY OF THE INVENTION A folding machine for a rotary press according to the present invention has a triple-fold structure in which a tip of a web is pierced by a needle to transport the web and the web is folded by a folding blade into a pair of folding rollers. A folding machine of a rotary press including a folding cylinder having a cylinder structure and a saw copper having a double cylinder structure for cutting the web in cooperation with the folding cylinder, wherein the folding blade starts a folding operation of the web. The relative position of the folding cylinder and the saw cylinder is set so that the cutting of the web is completed before, and the needle is pulled out from the web after the folding blade starts the folding operation of the web. It is characterized in that it is provided with a needle actuating means for actuating the withdrawal of the needle.

The web cutting timing setting method according to the present invention has a triple cylinder structure in which the tip of the web is pierced with a needle to transfer the web and the web is folded by a folding blade into a pair of folding rollers. The present invention is applied to a folder of a rotary press including a folding cylinder and a saw copper having a double cylinder structure for cutting the web in cooperation with the folding cylinder, and the folding blade is configured to perform the folding operation of the web before starting. Setting the relative position of the folding cylinder and the saw cylinder so that the cutting of the web is completed, and removing the needle so that the needle is removed from the web after the folding blade starts the folding operation of the web. And a step of setting an operation timing. According to the folding machine of the rotary press and the method for setting the timing of cutting the web and the timing of removing the needle in the folding machine according to the present invention, the folding operation of the folding blade is started while the needle is pierced at the leading end of the web.

[0012]

1 to 5 are conceptual views showing the essential parts of an embodiment of a folding machine of a rotary press and a method for setting a web cutting and needle removal timing according to the present invention. In addition,
In FIGS. 1 to 5, elements common to those shown in FIGS. 7 to 11 are designated by the same reference numerals. Since the specific configuration and operation of this common element are as described above, the description thereof will be omitted below.

The folding machine according to this embodiment has the above-mentioned 2
A saw cylinder 7 having a double cylinder structure and a folding cylinder 8 having a triple cylinder structure are provided, and the relative positions of these cylinders 7, 8 are different from those of the conventional folding machine shown in FIGS. That is, in this embodiment, since the cutting of the web 3 by the saw cylinder 7 is completed before the folding blade 13 starts the pushing operation against the web 3, the saw cylinder 7 is positioned above the saw cylinder 7 of the conventional folding machine. Is located in.

In this example, the relative positional relationship between the cylinders 7 and 8 is set so that the axial center of the saw cylinder 7 and the axial center of the folding cylinder 8 are located in the same horizontal plane. It is not necessary to set such relative positional relationship. in short,
It suffices that a relative positional relationship is set in which the cutting of the web 3 is completed before the folding blade 13 starts the pushing operation.

On the other hand, in this embodiment, as shown in FIG. 1, the needle pull-out position is the rotational direction (counterclockwise direction in FIG. 2) of the folding cylinder 8 by an angle α (about 30 ° in this example) from the horizontal line. Rotation) is set to a position closer to the opposite side. In the conventional folding machine, as shown in FIG. 7, the needle pull-out position is at an angle β (β> β) from the horizontal line.
α, which is set at a position of about 45 ° in this example.

The needle pull-out position is a needle pull-out timing position at which the needle 12 provided on the folding cylinder 8 is pulled out from the web 3,
It is set by a needle actuation mechanism (not shown) that operates to insert and remove the needle. The needle actuating mechanism is configured to rotate the shaft 12a that supports the needle arm 12b by, for example, a cam mechanism that interlocks with the rotation of the folding cylinder 8.
The needle 12 is projected and retracted by the rotation of a. The needle missing position can be adjusted by changing the cam position of the cam mechanism, and in this embodiment, the angle α
The cam position of the cam mechanism is set so that the needle 12 is retracted from the peripheral surface of the folding cylinder 8 when the needle 12 moves to the line.

The operation of the folding machine according to this embodiment will be described below. FIG. 1 shows a state immediately after the web 3 is cut by the saw blade 10 of the saw cylinder 7 and the saw blade receiver 11 of the folding cylinder 8. At this time, the tip of the folding blade 13 is not in contact with the web 3, and the needle 12 stuck at the leading end of the web 3 has not reached the needle pull-out position. As is clear from this figure, in this embodiment, the folding blade 13
The cutting of the web 3 has already been completed before the web contacts the web 3.

FIG. 2 shows a state in which the tip of the folding blade 13 is rotationally moved to the position where it comes into contact with the web 3 as the folding cylinder 8 rotates. In this state, the needle 12 has not moved to the needle pull-out position, and therefore the tip of the web 3 is held by the needle 12 on the peripheral surface of the folding cylinder 8.

Thereafter, as the folding cylinder 8 rotates, the folding blade 13 further rotates in the clockwise direction, so that the web 3 is pushed to the folding roller 14 side. At this time, since the tip of the web 3 is held on the peripheral surface of the folding cylinder 8, there is no risk of the tip of the web 3 fluttering.
So-called end folds and wrinkles do not occur at the tip of the. Further, since the folding blade 13 rotates while squeezing the surface of the web 3 to define the folding position of the web 3, the folding accuracy of the web 3 is also improved.

FIG. 3 shows a state in which the folding blade 13 is most protruded, that is, the blade 13 is rotated to an intermediate position of the folding roller 14. In this embodiment, the needle removal is performed so that the needle 12 is retracted at the timing when the folding blade 13 is rotated to the position immediately before the position shown in FIG. 3, that is, at the timing when the folding position of the web 3 is defined. The position angle α is set. When the needle 12 is retracted, the holding of the web 3 by the needle 12 is released, so that the web 3 is folded between the folding rollers 14 and 14 as shown in FIG.

As shown in FIG. 4, when the folding blade 13 is further rotated and the tip of the folding blade 13 is positioned on the peripheral surface of the folding cylinder 8, the folding operation of the web 3 by the rollers 14 and 14 considerably progresses. Then, when the folding cylinder 8 is rotated to the state shown in FIG. 5, the folding operation of the web 3 by the rollers 14 and 14 is almost completed, and the signature 18 is formed.

As described above, according to this embodiment, the cutting of the web 3 is completed before the folding blade 13 starts the folding operation of the web 3, so that the needle 12 is attached to the web 3.
Although the folding operation of the web 3 by the folding blade 13 is started in the state where the stab is stuck, this folding operation is smoothly executed. Since the folding operation of the web 3 by the folding blade 13 is executed in the state where the needle 12 is pierced into the web 3, fluttering of the leading end portion of the web 3 during this folding operation is suppressed, and the leading end portion is suppressed. It is possible to prevent edge breakage and wrinkles from occurring.

Further, according to this embodiment, since the leading end side of the web 3 is not pulled to the folding roller 14 side when the web 3 is pushed by the folding blade 13, the folding position of the web 3 can be accurately measured. Can be set.

As mentioned above, after cutting the web 3, the rear end of the web 3 formed by this cutting is left in a free state. However, since the rear end portion is transported in the same direction as the peripheral surface moving direction of the folding cylinder 8, there is no fluttering phenomenon that causes end bending or wrinkles. In short, the fluttering phenomenon that causes edge breaks and wrinkles is caused by the folding cylinder 8
Occurs remarkably on the leading end side of the web 3 transported in the direction opposite to the circumferential surface moving direction, and according to the above embodiment, the flapping phenomenon on the leading end side is effectively suppressed.

[0025]

As is apparent from the above description, according to the present invention, the relative positions of the folding cylinder and the saw cylinder are adjusted so that the cutting of the web is completed before the folding blade starts the folding operation of the web. The needle is pulled out of the web after it has been set and the folding blade has started the folding operation of the web. Therefore, fluttering of the leading end portion of the web when the web is folded between the folding rollers is suppressed, and it is possible to prevent the leading end portion from wrinkling or wrinkling.
Further, since the leading end side of the web is not drawn to the folding roller side when the web is pushed by the folding blade, the folding position of the web can be set with high accuracy.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a main part of a folding machine according to the present invention, showing a state immediately after a web is cut.

FIG. 2 is a conceptual view of the main parts of the folding machine, showing a state immediately before the folding blade starts folding the web.

FIG. 3 is a conceptual diagram of a main part of the folding machine, showing a state in which a folding blade is most protruded.

FIG. 4 is a conceptual diagram of a main part showing a folding operation of a folding roller in the folding machine.

FIG. 5 is a conceptual diagram of a main part showing a state where the folding operation of the folding roller is almost completed.

FIG. 6 is a conceptual diagram illustrating the basic configuration of a folder for a rotary press.

FIG. 7 is a conceptual diagram of a main part of a conventional folding machine showing a state immediately before a web is cut.

FIG. 8 is a conceptual diagram of a main part of the conventional folding machine, showing a state immediately before the folding blade starts folding the web.

FIG. 9 is a schematic view of a main part of the conventional folding machine, in which the folding blade is in the most protruding state.

FIG. 10 is a conceptual diagram of a main part showing a folding operation of a folding roller in the conventional folding machine.

FIG. 11 is a conceptual diagram of a main part showing a state where the folding operation of the folding roller is almost completed.

[Explanation of symbols]

1 folding machine 3 Web 4 triangular plate 7 saw body 8,8 'folding cylinder 10 saw blade 11 saw blade receiver 12 needles 13 folding blade 14 Folding roller

Claims (2)

[Claims] 1. A folding cylinder having a triple cylinder structure in which a needle is pierced at the tip of the web to transport the web, and the web is folded into a pair of folding rollers by a folding blade, and the folding cylinder cooperates with the folding cylinder. A folding machine for a rotary press, comprising a double copper saw blade for cutting a web, wherein the folding cylinder is configured to complete the cutting of the web before the folding blade starts the folding operation of the web. A relative position of the saw cylinder is set, and needle actuating means for activating the needle so that the needle is withdrawn from the web after the folding blade starts the folding operation of the web is provided. Folding machine for rotary press. 2. A folding cylinder having a triple cylinder structure in which a needle is pierced at the tip of the web to transfer the web, and the web is folded into a pair of folding rollers by a folding blade, and the folding cylinder cooperates with the folding cylinder. The present invention is applied to a folding machine of a rotary press including a double copper saw blade for cutting a web, wherein the folding cylinder is configured to complete the cutting of the web before the folding blade starts the folding operation of the web. A step of setting a relative position of the saw cylinder; and a step of setting a timing of the needle withdrawal operation so that the needle is withdrawn from the web after the folding blade starts the folding operation of the web. A method for setting the timing of cutting a web and the timing of removing a needle in a folding machine of a characteristic rotary press.