JPH01181681A - Plough folding device of printing machine - Google Patents

Abstract

PURPOSE:To prevent generation of wrinkle and flaw in the form of pitching at a plough folding part by, furnishing a cylinder, whose peripheral surface is put closely alongside the fold line of a web, in the neighborhood of the end top of a plough unit. CONSTITUTION:A web 2 is paid off by a drive roller 12a of an inlet side guide roller 14 and put closely alongside a fixed roller 17 and a tension roller 19 in S form, to be given a tension, and then is put closely alongside a plough unit 20 to then go toward an outlet side guide roller 16. At this time, the web 2 protruding at the end of the plough unit 20 is pressed to the end face of the plough unit 20 and folded. the folded web 2 is passed to a former 31 under guidance of drag rollers 29, 30 and folded into halves in the width direction. As in this plough folding, the neighborhood of the fold line of the web 2 is held by a guide roll 33 rotating, the running path of the web 2 is maintained constant within the elasticity range of the web 2, and no wrinkle or flaw will be generated in the neighborhood of the fold line.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a plow installed in the folding machine paper input section of a web rotary printing machine, which folds one or both sides of a running web and sends it to a downstream former folding device, etc. The present invention relates to a folding device.

[Conventional technology]

In web rotary printing machines, the web that has been dried and cooled after printing is either sent to a folding machine, subjected to various folds such as former folding, and then ejected, or fed into a sheet, cut, and then ejected. Ru. In such rolled paper rotary printing presses, a folding device called a plow folding device is sometimes provided in the paper input section of the folding machine. This plow folding device consists of a guide roller on the artificial side that attaches a running web, a plow unit that is disposed on the downstream side of the web traveling side of this guide roller and performs plow folding, and a web that is folded by this plow unit. and a guide roller on the exit side to which the With this configuration, after printing, the dried and cooled web is guided to the plow folding device in the sheet input section of the folding machine, and then guided from the input side guide roller to a shorter plow unit. It is plow-folded and guided to a guide roller on the exit side. Thereafter, when the web is fed into a former and folded in half in the width direction, the web is folded into three by plow folding and former folding.

(Problems to be Solved by the Invention) In the plow folding operation of a printing press such as a car, tension is applied to the web running attached to the plow unit, but the tension at the folded part held by the plow is Since the tension becomes extremely small (in fact, negative) and a large tension difference is created at the fold line between the roller and the roller attachment part, the tension is distributed until this tension difference returns to zero tension. During this tension distribution The tension step is absorbed by the elasticity of the web as it swells at the tip of the plow, but when the elastic limit of the web is exceeded, that is, the web length is larger than the running path length of the web due to the swell. When the length of the web becomes shorter than the travel path length, pitching-like wrinkles and scratches occur on the web, which has conventionally been unavoidable.

[Means to solve the problem]

In order to solve this problem, in the present invention, a cylindrical body whose peripheral surface is attached to the vicinity of the fold line of the web is provided near the apex of the end of the plow unit.

[Operation] The web guided from the entrance guide roller to a shorter plow unit is plow-folded and guided to the exit guide roller. During plow folding, by providing a cylindrical body near the apex of the end of the plow unit, the running path of the web is maintained constant within the elastic range of the web, and pitching-like wrinkles and scratches do not occur in the plow folded portion.

〔Example〕

1 to 3 show an embodiment of a plow folding device for a printing press according to the present invention, in which FIG. 1 is a schematic front view thereof, FIG. 2 is a perspective view of the vicinity of the plow unit, and FIG. 3 is an embodiment of the present invention. In Figure 0, which is a schematic front view of a cooling device and a folding machine paper input section of a printing machine that carried out this process, a web 2 that has been dried in a drying device after printing is placed between a folding machine 1 and a drying device (not shown). A cooling device 4 is provided which includes a plurality of cooling rollers 3 that are brought together for cooling. From the upper end of the frame 5 of the folding machine 1, a paper input frame 7 supported by a cooling device 4 by a support 6 projects horizontally toward the front. A guide roller group 8.9 consisting of a plurality of rollers is disposed at the front end of each of the guide rollers. The web 2 cooled by the cooling device 4 is guided to a guide roller 10.11 at the front end of the paper input frame 7 via a guide roller group 8.9.

A plow folding device, generally designated by the reference numeral 12, is placed and fixed on the upper surface of the paper input frame 7.
A driving roller 13a, an entrance-side guide roller 14, and an inlet-side guide roller 14 are arranged between these frames 13 in order from the upstream side of paper travel.
The folding mechanism 15 is equipped with a guide roller 16 on the exit side.

Of these, the entrance side guide roller 14 includes a rotatable fixed roller 17 and a tension roller 19 supported by a pair of swingable arms 18 with the fixed roller 17 as the center of swing. The web 2 from the roller 12a is attached to a fixed roller 17 and a tension roller 19 in an S-shape to be tensioned, and then guided to the folding mechanism 15. The folding machine tJ115 is equipped with a plow unit 20 supported on one side by the frame 13, and this plow unit 20 is connected to the roller 17.1 of the guide roller 14.
9, and its protruding end is supported by a semicircular bearing or the like. The web 2 from the entrance guide roller 14 is guided to the exit guide roller 16 after being attached, for example, two-thirds of its entire width to the upper peripheral surface of the plow unit 20 in a mountain shape. Outlet side guide roller 1
Reference numeral 6 includes a fixed roller 21 rotatably supported by a shaft, and a tension roller 23 supported by a pair of swingable arms 22 with this fixed roller as the center of vibration. are these two rollers 21
．． Tension is applied by being attached to 23 in an S-shape. The web 2 thus applied to the folding roller 20 under tension by the front and rear rollers 14, 16 has its entire width 173 projected from the projecting side end of the plow unit 20, and this projecting portion is plow unit 2
It is bent in the right angle direction so as to be attached to the end face of o.

Therefore, the web 2 attached to both the rollers 21 and 23 on the exit side described above is a web in a folded state. On the downstream side of the exit side guide roller 16 in the running direction of the web 2, there is a drag roller 27.28 and a guide roller 29.3.
0 is arranged, and the web 2 after plow folding is pulled out by drag rollers 27 and 28, guided by guide rollers, sent to an inverted triangular plate-shaped former 31, and folded in half in the width direction. It is configured. That is, the web 2 is folded 1/3 from one end by plow folding, and then folded in half by former folding, so that the web 2 is folded into three. Further, a sheeter (not shown) is disposed on the downstream side of the guide roller 29 via a guide roller 32, and the web 2, which is not folded by a former depending on the specifications of the printed material, is disposed on the downstream side of the guide roller 29.
is fed into this sheeter and cut into a predetermined length.

In this device, a guide roller 33 as a cylindrical body formed in a cylindrical shape near the apex of the end of the plow unit 20 is supported by a bracket 34 with its peripheral surface attached to the vicinity of the fold line of the web 2. The running path of the web 2 is maintained constant within the elastic range of the web 2.

The operation of the plow folding device configured as described above will be explained by taking the case of folding a web into three as an example. After printing, the web 2, which has been dried in the drying device, is cooled while running next to the cooling rollers 3 of the cooling device, and is guided to the plow folding device 12 via a guide roller group 8.9 and a guide roller 10.11. It will be destroyed. This web 2 is then moved to the entrance side guide roller 14.
After being fed out by the driving roller 12a, the fixed roller 1
7 and the tension roller 19 in an S-shape, tension is applied, and the web 2 is attached to the plow unit 20 and moves toward the exit side guide roller 16. At this time, the web 2 protruding from the end of the plow unit 20 Since the web 2 is pressed against the end face side of the plow unit 20 and bent, the web 2 is folded along the fold line at 1/3 from the end and attached to the fixed roller 21 and the tension roller 23 of the exit side guide 16 in an S-shape. It is folded while applying tension when it is touched. The web 2 folded in this way is pulled out by drag rollers 27.28 and guided by guide rollers 29.3.
0 and fed into the former 31, where it is folded in half in the width direction. As a result, the web 2 is folded into three by plow folding and former folding. In such plow folding, the guide rollers 33 press the web 2 near the fold line while rotating, so that the running path of the web 2 is aligned with the web 2.
The elasticity is maintained constant within the range of , and no wrinkles or scratches occur near the fold line.

In this embodiment, a rotatable guide roller 33 is provided as a cylindrical body provided near the apex of the end of the plow unit, but the guide roller 33 does not necessarily need to rotate.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in the plow folding device of a printing press, a cylindrical body whose circumferential surface is attached to the vicinity of the folding line of the web is provided near the apex of the end of the plow unit. During folding, the cylindrical body presses the lower part of the web close to the fold line, so the running path of the web is maintained constant within the elastic range of the web, preventing wrinkles or scratches from occurring near the fold line of the web, and improving the quality of the printed material. Quality is greatly improved.

[Brief explanation of the drawing]

1 to 3 show an embodiment of a plow folding device for a printing press according to the present invention, in which FIG. 1 is a schematic front view thereof, FIG. 2 is a perspective view of the vicinity of the plow unit, and FIG. 3 is an embodiment of the present invention. FIG. 2 is a schematic front view of a cooling device and a folding machine paper input section of a printing press in which the above-mentioned printing press was implemented. l-... Folding machine, 2... Web, 12... Plow folding device, 14... Population side guide roller, 16...
...Exit side guide roller, 20...Plow unit, 33...Guide roller.

Claims (1)

[Claims] A guide roller on the entrance side that is located at the paper input section of the folding machine and attaches the running web after printing, a plow unit that is arranged downstream of this guide roller and folds the web, and a plow unit that folds the web. In a plow folding device of a printing press, which is equipped with a guide roller on the exit side for attaching the ejected plow-folded web, the peripheral surface is attached to the vicinity of the fold line of the web near the apex of the end of the plow unit. A plow folding device for a printing press, characterized in that it is provided with a cylindrical body.