JPH10250035A - Winding-up type rotary press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of crease lines or meandering of a web in an idling printing unit of a winding-up type rotary press. SOLUTION: A web conveying means, which can change a running pathway of a web 3 by moving positions of an impression cylinder 12 and a guide roller 21 for introducing the web 3 to the impression cylinder 12 or a guide roller 22 for guiding the web 3 from the impression cylinder 12, independently or together with each other, and can convey the web 3 by separating the web 3 from the impression cylinder 12, is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to web running of a web-fed rotary printing press, and more particularly, to a press cylinder or a guide around the press cylinder when a wrinkle occurs around an empty printing unit of the press. The present invention relates to a web-type rotary printing press capable of moving a roller to separate a web from an impression cylinder and suppressing generation of wrinkles.

[0002]

2. Description of the Related Art Generally, various kinds of materials such as paper, film, metal foil, woven fabric, non-woven fabric, or a composite material or a laminate material of these materials are used as a printing object to be printed. Have been. When printing on these webs and sheets, depending on the characteristics of the material, a gravure printing machine,
Various printing presses such as offset printing presses and letterpress printing presses are used. In these printing presses, printing is often performed by a single printing press on webs and sheets made of various types of paper such as materials, thicknesses, widths, and lengths, or films and foils.

As an example of such a printing press, there is a roll-type rotary printing press of a gravure printing system. Gravure printing is
This method uses a printing plate made by photoengraving or engraving and printing with a low-viscosity solvent-type ink. Compared with other printing methods, it is difficult to stabilize the quality, but the printing method is simple. The principle of printing is that printing is performed by filling an image portion of a concave portion of a plate surface with ink, passing a printing medium between a printing plate and a rubber roller called an impression cylinder, and transferring the ink by applying pressure. Gravure printing is widely used in photographic printing, making use of its rich gradation expression. In addition, the ink is a low-viscosity, solvent-type ink that is rich in fluidity and quick-drying, so high-speed printing is possible. Is possible, and
Printing can be performed on a wide range of substrates by changing the solvent, pigment, and resin that constitute the ink. Utilizing these features, gravure printing is used in a wide range of fields, such as flexible packaging printing, paper container printing, building material printing, as well as publication printing, and in particular, there are few restrictions on printing materials, and large quantities and high speed printing Taking advantage of its characteristics, it is used favorably for a wide variety of long winding, ie, web printing.

FIG. 5 is a partial sectional view showing a part of a printing section of a gravure printing machine. In the figure, reference numeral 10 denotes a printing unit. The printing unit 10 includes a plate cylinder 11 on the surface of which a pattern to be printed, that is, a concave gravure cell forming an image portion is formed.
An ink supply device such as an ink pan 13 and a forming roller 14 for supplying the ink 4 to the plate cylinder 11; a doctor device 15 for scraping off ink in a non-image area attached to the plate cylinder 11; And an impression cylinder 12 for transferring the ink embedded in the gravure cell to the web 3.

[0005] The plate cylinder 11 is a sturdy cylindrical body having a body processed from a steel pipe. The outer periphery of the plate cylinder 11 is finished with high precision, and is plated with copper, polished, gravure-plated, and further processed by a doctor device. In order to prevent abrasion, the surface is hard chrome plated and polished again. In addition, since the impression cylinder 12 prints on paper with the pressing force against the plate cylinder 11, it is of a strength that can withstand it and is made of a steel pipe core made of synthetic rubber. The diameter of the impression cylinder is not so large to improve the effectiveness of the printing pressure. When the printing medium is paper, such as for publishing printing, a thick steel tube is used to obtain high printing pressure.However, for packaging printing, the impression cylinder is replaced with a change in the width of the printed material. Consider the use of relatively thin steel pipe. The impression cylinder is wound with rubber, the thickness is 10 to 15 mm, and an appropriate rubber hardness is selected according to the type of the printing medium. Generally, plastic films need to be soft, and paper and rough kraft paper need to be hard. Nitrile rubber is often used because the rubber material is required to have resistance to ink and solvents.

[0006] The plate cylinder 11 and the impression cylinder 12 are respectively supported on the pivot of the printing unit 10 by a bearing mechanism (not shown), and connected to a prime mover such as a motor via a drive shaft to rotate in the direction shown. The impression cylinder 12 is supported by a pivot via a not-shown attachment / detachment mechanism for pressing the web 3 against the plate cylinder 11 or, conversely, separating the web 3 from the plate cylinder 11. Printing on the web 3 is performed at a contact position between the plate cylinder 11 and the impression cylinder 12, and the ink embedded in the gravure cell on the surface of the plate cylinder 11 is pressed by the pressing force acting on the contact position. The transfer is made to the web 3 wound around.

In the ink pan 13 shown in the figure, a fixed amount of the ink 4 is stored, and the lower portion of the plate cylinder 11 is immersed in the ink. Although not shown, an ink tank for storing the ink and an ink pump for sucking the ink from the ink tank and supplying the ink to the ink pan 13 are provided to supply a predetermined amount of the ink 4 to the ink pan 13. And the ink pan 1
The ink stored in 3 is configured to be collected in an ink tank through an overflow pipe. Further, a forming roller 14 is provided inside the ink pan 13,
The plate 4 is rotated in the same direction as the rotation of the plate cylinder 11 so as to push the ink 4 into the concave gravure cells formed on the surface of the plate cylinder 11.

[0008] In the rotation direction of the plate cylinder 11, the
Is provided with a doctor device 15 for scraping off the ink 4 attached to the surface of the plate cylinder 11, and the blade thereof is pressed against the plate cylinder 11. This doctor device 15 is used for the plate cylinder 1.
1 is fixed to the pivot of the printing unit 10 via an adjusting mechanism (not shown) which can adjust the contact angle and the contact pressure with respect to the printing unit 1.

In the printing unit 10, in order to transfer the ink embedded in the gravure cell of the image portion formed on the surface of the plate cylinder 11 to an accurate position on the web 3, Is provided with a web introduction guide roller 21 for guiding the web 3 to an accurate position and direction with respect to the impression cylinder 12 around which the web 3 is wound. This web introduction guide roller 21 is generally called a twist roller. A web for transferring the ink 4 to which the ink 4 has been transferred at the press contact portion between the impression cylinder 12 and the plate cylinder 11 without pulling out and displacing the web 3 is provided at the exit side of the printing unit 10. An output guide roller 22 is provided. These guide rollers 21 and 22 are usually made of metal and provided with air vent grooves on the roller surface.

FIGS. 6 and 7 are cross-sectional views for explaining the web traveling path of the gravure printing machine in more detail. In the drawing, reference numeral 30 denotes a drying unit for drying the ink printed on the web 3 in the printing unit shown in FIG. 5, and 23 denotes a web for guiding the web 3 to the drying unit 30. It is a supply guide roller. The traveling path of the web in the printing press is first wound around the impression cylinder 12 via a web introduction guide roller 21 provided on the entrance side of the printing unit. The web 3 wound around the impression cylinder 12 of the printing unit
Is guided into the drying unit 30 via a web guide roller 22 provided on the exit side of the printing unit and a web supply guide roller 23 provided on the entrance side of the drying unit 30.

When the web 3 is passed through the above-mentioned printing machine, FIG.
As shown in FIG. 7, when the impression cylinder 12 is retracted from the press contact portion with the plate cylinder 11 and printing starts, as shown in FIG.
The impression cylinder 12 descends and conveys the web 3 while holding the web 3 at a pressure contact portion with the plate cylinder 11. The guide rollers 21, 22, and 23 provided on the web running path usually have no drive source, and are configured to rotate by friction acting between the roller surface and the web 3.

In the gravure printing machine configured as described above, the material and thickness of the web 3, the ink 4 and drying conditions to be used, the tension applied to the web 3, the running speed, and the pressure between the plate cylinder 11 and the impression cylinder 12. Depending on conditions such as pressing force, wrinkles and meandering may occur in the web 3 during printing. If the wrinkles or meandering occur on the web, printing cannot be performed normally. Therefore, the occurrence of wrinkles is suppressed by adjusting the parallelism of the guide rollers provided near the places where the wrinkles and the like occur and the surface properties of the rollers. However, when the generation of wrinkles cannot be suppressed only by the guide rollers normally provided in the printing press, the guide rollers are replaced with guide rollers for removing various wrinkles, such as an expander roller and a herringbone roller, to suppress wrinkles and meandering.

FIG. 8 is a side perspective view showing a part of a web-type rotary printing press for multicolor printing in which a large number of printing units constituted by the printing section, the guide roller group, and the drying section are arranged in series. FIG. The web-fed rotary printing press 1 generally includes a web feeding unit (not shown) and a plurality of printing units 2a, 2b,
2c and a paper discharge unit (not shown) provided with a web winding device, a folding device, a cutting device, and the like, and FIG. 8 shows a printing unit portion thereof.

Each printing unit 2a, 2b, 2c of the printing press
Comprises a plurality of guide roller groups 20a, 20b, 20c;
A printing unit 10 including an impression cylinder, a plate cylinder, a doctor device, and an ink supply device such as an ink pan shown in FIG.
a, 10b, 10c and the printing units 10a, 10b, 10c
And drying sections 30a, 30b, and 30c for drying the inks printed on the web 3 respectively. The guide roller group, the printing section, and the drying section are fixed to pivots disposed on both sides of the printing press. ing.

When printing is performed on the web 3 in the printing press 1 having the above-described configuration, the web 3 is pulled out from a not-shown take-up / feed unit by an infeed roller, and is first wound around the first printing unit 2a. In the printing unit 2a, it is wound around the impression cylinder of the printing unit 10a through the guide roller group 20a, and then guided to the guide roller group 20b of the second printing unit 2b through the drying unit 30a. Also in the second printing unit 2b, after being wound around the printing unit 10b and the drying unit 30b through the guide roller group 20b, it is guided to the third printing unit 2c. In the third printing unit 2c, similarly to the other printing units, the web 3 is wound around the printing unit 10c and the drying unit 30c through the guide roller group 20c, and then guided to a paper discharge unit (not shown) to be wound. Can be In printing a publication such as a book, the web 3 is discharged via a folding device or a cutting device.

The above-described web-type rotary printing press for multicolor printing is used in a wide range of fields such as flexible packaging printing, paper container printing, and building material printing as well as publishing printing. In packaging and paper container printing, printing may be performed with a smaller number of colors than the number of printing units provided in the printing press. In such a case, for example, as in the printing unit 2b shown in FIG. 8, the web 3 is wound around the printing unit 2b without mounting the plate cylinder and supplying ink to the ink supply device for the plate cylinder. Operate the printing press with it turned. Further, when the drying property of the ink used is low and sufficient drying cannot be obtained by only the drying unit of one printing unit, only the drying unit of the subsequent printing unit may be used. In such a printing unit 2b on which printing is not performed, the web 3 passes through the same web running path as in the case of performing normal printing as shown in FIG.

However, as described above, when printing the web 3 through the blank printing unit on which no printing is performed,
Depending on the material and thickness of the web, drying conditions of the pre-printing unit, and conditions such as tension applied to the web 3 and running speed,
In the empty printing unit, wrinkles and meandering may occur in the web 3. If wrinkles or meandering occur on the web, it will not be possible to print properly in the subsequent printing unit, so adjust the parallelism of the guide roller provided near the place where wrinkles occur and the surface properties of the roller to reduce the occurrence of wrinkles. I am holding it down. However, when the generation of wrinkles cannot be suppressed only by the guide rollers normally provided in the printing press, the guide rollers are replaced with various wrinkle removing guide rollers to suppress wrinkles and meandering.

[0018]

In order to replace the guide rollers, the printing press is stopped to stop the web conveyance, the guide rollers mounted on the printing press are removed, and the guide rollers are replaced with other guide rollers. Since the guide rollers need to be replaced manually, the printing press must be stopped during replacement.
The operation efficiency of the printing press is reduced, and more labor is required. In addition, since the adjustment of the assembly of the guide rollers requires precision, skilled skills are required, the work time required for replacement work is long, and in the case of a wide printing machine, the guide rollers are long and heavy. The burden is heavy and the labor is heavy. Accordingly, an object of the present invention is to provide a web-fed rotary printing press that can suppress the occurrence of wrinkling of a web in an empty printing unit without replacing a guide roller.

[0019]

Means for Solving the Problems The present inventors have earnestly conducted research on the occurrence of wrinkles and meandering of the web in the idle printing unit of the web-type rotary printing press as described above,
The cause was found to be due to the impression cylinder wound around the web. In other words, the impression cylinder used in the gravure or letterpress web-type rotary printing press is usually coated on its surface with rubber, and therefore, the frictional characteristics and the friction acting between the web and the impression cylinder are reduced. It has been found that wrinkles and meandering occur because the lubricating properties become inappropriate during non-printing.

For example, when normal printing is performed using a plate cylinder, a web introduction guide roller 21 disposed between a press-contact portion between the impression cylinder and the plate cylinder and a preceding printing unit causes the press-contact portion. The biased tension of the web introduced into the press unit can be equalized, and the biased tension of the web derived from the press contact portion can also be similarly reduced by the web guide guide roller 22 disposed between the web and the subsequent printing unit. Can be equalized,
The occurrence of wrinkles and meandering can be suppressed. However, in the case of the blank printing unit, there is no press-contact portion between the plate cylinder and the impression cylinder, and therefore, the web travels between the pre-printing unit and the post-printing unit, that is, in almost twice the normal path, and Because it comes into contact with the impression cylinder coated with rubber having high friction, wrinkles and meandering are likely to occur. In particular, the web running at high speed in the idle printing unit tends to be more unstable than usual because an air layer is formed between the web and the impression cylinder.

As a result of various experimental studies, the present inventors have determined that the position of the guide roller that separates the impression cylinder from the web travel path or introduces the web into the impression cylinder or guides the web from the impression cylinder is determined. It was found that by moving the web away from the impression cylinder, the web did not wrinkle or meander. That is, the present invention has solved the above-described problem by a web-fed rotary printing press having a web transport unit capable of running a web away from an impression cylinder in a printing unit. Further, as described in claim 2, in addition to the invention of claim 1, the position of the impression cylinder, the position of the guide roller for introducing the web into the impression cylinder, or the position of the guide roller for guiding the web from the impression cylinder The above problem was solved by a roll-type rotary printing press capable of changing the traveling route of a web by moving the web independently or in combination.

[0022]

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

(Structure of Apparatus) First, the structure of the web-fed rotary printing press of the present invention will be described. FIG. 1 is a side perspective view showing an example of a traveling path of a web in a printing section of a web-fed rotary printing press according to the present invention. In the figure, 3 is a web, 11 is a plate cylinder, and 12 is an impression cylinder. Also, 2
1, 22 and 23 are guide rollers for guiding the web.

The guide roller 21 includes a plate cylinder 11 and an impression cylinder 12.
Is introduced to the printing section composed of The guide roller 22 guides the web 3 from the printing unit 10. Further, the guide roller 23 is connected to the printing unit 10.
Is guided to the drying unit 30. These guide rollers are made of iron, aluminum, or alloys of which the surface is abrasion-resistant, the web is not slippery, and the surface is appropriately treated so as not to cause abrasion on the web. Is a cylindrical or hollow cylinder formed by a bearing, and is supported on a support shaft via a bearing such as a bearing, and the support shaft is fixed to a pivot of a printing press.

These guide rollers 21, 22, 23
Is mounted on a printing machine so that the web 3 can be freely rotated by friction with a roller surface accompanying the running of the web 3. In addition, it is preferable that the surface of the roller has an air vent groove so that an air layer is formed between the guide roller and the web by the web 3 running at a high speed and the web does not slip.

The embodiment of FIG. 1 shows an example of a gravure printing machine. In this blank printing unit, since printing is not performed on the web 3, the plate cylinder 11 is not mounted on the printing unit. On the other hand, since the impression cylinder 12 is difficult to remove even in an empty printing unit in which printing is not performed on the web 3, the impression cylinder 12 is mounted as it is. That is, as described above, since the impression cylinder 12 prints on paper with the pressing force against the plate cylinder 11, the impression cylinder 12 is made of a steel pipe core made of synthetic rubber and has the strength to withstand the printing. The rubber thickness is 10
It has a suitable hardness suitable for printing and a resistance to inks and solvents.

In the printing section of the web-fed rotary printing press of the present invention,
Even when printing is not performed on the web 3, the web 3 is run while the web 3 is wound around the impression cylinder 12. If wrinkles or the like occur in the web 3, the occurrence of the wrinkles is suppressed. Therefore, as shown in the figure, in order to separate the impression cylinder 12 from the traveling path of the web 3, the impression cylinder 12 is moved up in the direction of the arrow. The movement of the impression cylinder 12 includes, for example, a bearing (not shown) that supports a support shaft that supports the impression cylinder 12,
The drive shaft of the impression cylinder 12 can be moved up and down by being supported by disk-shaped eccentric wheels provided on the pivots on both sides of the printing press and rotating the eccentric wheels. The eccentric wheel is provided with a worm gear mechanism coaxially with the center of the disk, and a handwheel provided on the worm shaft is rotated, or preferably, pneumatic or hydraulic drive means is provided, and the drive means is provided. Drive to rotate the eccentric wheel. Further, desirably, a fixing means for fixing an eccentric wheel for vertically moving the support shaft of the impression cylinder 12 to the pivot of the printing press may be provided.

(Operation of Apparatus) Next, the operation of the idle printing unit of the printing press according to the present invention will be described. First, as shown in FIG. 1, the web 3 includes a web introduction guide roller 21, an impression cylinder 12, a web derivation guide roller 22,
It is guided to the drying unit 30 via the web supply guide roller 23 and the like. Although not shown, a heat-resistant guide roller is provided in the drying unit 30 to convey the non-printed surface of the web. Note that the drying unit 30 can be heated as needed.

In the web-type rotary printing press for multicolor printing shown in FIG. 8, the printing units 10a, 10b and 10c are not shown, but have a so-called register mechanism for adjusting the phase of each printing unit. The support shafts of the plate cylinder and the impression cylinder are both connected to a common drive source. Incidentally, the register mechanism may be constituted by a movable roller (not shown) for adjusting the cycle length of the web 3 between the printing units. In FIG. 8, guide roller groups 20a, 20
As shown in FIG. 1, b and 20c are composed of guide rollers 21, 22, 23 and the like. Although the printing unit shown in FIG. 8 shows only three colors for convenience, the gist of the present invention is not limited to this, and can be applied to a printing machine that performs printing of two or more colors.

Next, in the web-fed rotary printing press for multicolor printing shown in FIG. 8, the plate cylinder is prepared. In the case of multicolor printing, plate cylinders for four colors of yellow, red, and blue inks are usually made by using a gravure printing machine or a gravure engraving machine, if necessary. To the bearings of the printing units 10a and 10c in a predetermined order. However, it is not necessary to attach a plate cylinder to the printing unit 10b of the blank printing unit. Next, ink corresponding to the printing colors of the printing units 10a and 10c is supplied, and ink is supplied to each plate cylinder. The ink is supplied to the plate cylinder by supplying ink to an ink tank (not shown) provided for each printing unit, sucking the ink from the ink tank using an ink pump, and feeding the ink to the ink pan 13 as shown in FIG. This is done by storing a fixed amount of ink. The ink in the ink pan is returned to the ink tank through the overflow pipe, and when the ink supply to the ink pan 13 is stabilized, the printing units 10a and 1
While driving the plate cylinder of No. 0c, the doctor devices are respectively brought into contact with the plate cylinder to scrape off the ink in the non-image areas adhering to the plate cylinder and to supply an appropriate amount of ink to the gravure cells on the plate surface.

Next, each printing unit 2a of the printing press 1
While synchronously transporting the web 3 passed through 2b and 2c, the impression cylinders of the printing units 10a and 10c are respectively pressed against the plate cylinder to start printing. The impression cylinder of the printing unit 10b is not press-contacted because printing is not performed. Usually, at the start of printing, first, in the printing units 2a and 2c, the register (position) of an image to be sequentially printed on the web 3 is adjusted.
Further, for each printing unit, the density of the ink image printed on the web, that is, the color tone of the printed image is adjusted.
The adjustment of the ink density is performed by adjusting the contact angle and the contact pressure of the doctor blade with respect to the plate cylinder to adjust the amount of ink applied to the plate surface. If the quality of the image printed on the web 3 is stable even after performing these adjustments, the pressing force of the impression cylinder against the plate cylinder and the tension applied to the web are adjusted. When the printing of the image on the web 3 is stabilized in this way, while monitoring the quality of the printed image, the ink from the ink tank is removed from the ink tank by the ink pump in order to maintain a constant amount of the ink in the ink pan printed and consumed on the web 3. Recirculate.

If, at the start of printing or during printing, the web 3 of the printing units 10a, 10b, and 10c has waviness, wrinkles, meandering, misalignment, curl, sagging, folds, etc. The pressing force of the impression cylinder against the plate cylinder of the printing unit and the tension applied to the web 3 are adjusted, and the presence or absence of eccentricity, poor rotation, scratches, and dirt of each guide roller provided in the guide roller groups 20a, 20b, and 20c is checked. Remove. If the occurrence of wrinkles cannot be suppressed in the blank printing unit, as shown in FIG. 1, the impression cylinder 12 is moved upward to separate from the web travel path,
Stabilizes print quality by suppressing wrinkles.

In general, the material and thickness of a web that can be stably printed by one printing press, or the types of inks that can be used, are limited to some extent. These constraints depend on the operating experience of the printing press, the printing experience, and the like. It is almost determined by the accumulation of tests. Also, for wrinkle-prone webs,
The types and arrangement of guide rollers suitable for wrinkle removal are almost fixed. . Therefore, by providing the web conveying means capable of separating the web from the impression cylinder as in the present invention, it is possible to suppress at least wrinkles and meandering of the web caused by the impression cylinder. (1) The number of types of webs that can be used in one printing press can be increased, and the effect of removing wrinkles is particularly large when printing on thin paper having a thin web. Further, since the range that can be applied to various other printing conditions is expanded, it is preferable to provide the above-described web transport unit in all the printing units.

(Other Embodiments) In the embodiment of FIG. 1, the impression cylinder 12 is moved in order to separate the web 3 from the impression cylinder 12, but the impression cylinder used in a gravure printing machine or the like has a printing cylinder. It is heavy and needs strength to obtain the pressing force at the time,
A robust moving mechanism must be provided.

In the embodiment shown in FIG. 2, a moving mechanism is provided on guide rollers 21 and 22 disposed in front of and behind the impression cylinder 12, and the two guide rollers are moved downward, whereby the web 3 is moved.
Are configured to be separated from the impression cylinder 12. The amount of movement of the guide rollers 21 and 22 is substantially the same as the amount of movement of the impression cylinder of the first embodiment, but the weight of the guide roller is lighter than that of the impression cylinder, and the movement mechanism can be simplified. For example, the support shafts of the guide rollers 21 and 22 are fixed to the arm ends, and the
The system can be configured to be driven by a pneumatic or hydraulic piston.

Further, as another embodiment, as shown in FIGS. 3 and 4, an impression cylinder 12, a guide roller 21,
Or 22 is provided with a moving mechanism with one of the guide rollers, the impression cylinder 12 is raised, and the guide rollers 21 and
Alternatively, it may be configured to descend the 22. The other guide roller is fixed. In the examples shown in FIGS. 3 and 4, the moving amount of the impression cylinder 12 can be substantially halved as compared with the example of FIG. 1, so that the moving mechanism for the impression cylinder can be reduced.

Further, a moving mechanism is provided in all the guide rollers 21 and 22 including the impression cylinder 12, and, for example, as shown in FIG. When the above-described effect of removing wrinkles is not obtained, the position of the guide rollers 21 and 22 disposed before and after the impression cylinder is moved as shown in FIG. 2, or the web is drawn out as shown in FIG. With the position of the guide roller 22 fixed, a method of raising the impression cylinder 12 in conjunction with lowering the web introduction guide roller 21 may be used.
Also, as shown in FIG.
In a state where the position is fixed, the web leading guide roller 22 may be lowered together with the impression cylinder 12 being raised. That is, by changing the running path of the web 3 variously within a range where the web 3 does not contact the impression cylinder 12, the winding angle of the web around the guide roller 21 or 22 is changed, and the web 3 and the guide roller 21 are changed. , And 22, the state of friction and lubrication acting on the web changes, resulting in a web running without wrinkles and meandering.

Furthermore, if the web 3 can be separated from the impression cylinder 12, simply raise the position of the impression cylinder 12, or simply lower the position of the web introduction guide roller 21, or simply Any method that only lowers the position of the guide roller 22 may be used. Furthermore, when wrinkles are less likely to occur when the web 3 is in contact with the impression cylinder 12, the web 3 is moved to the impression cylinder 12.
By moving the position of the impression cylinder 12, the guide roller 21, or 22 without completely separating the web 3, the direction and strength of each load applied to the web 3 can be changed to prevent the web from wrinkling. become.

[0039]

As described in detail above, the web-fed rotary printing press according to the present invention, as described in claim 1, has a printing section in which the web can be transported so that the web can run away from the impression cylinder. Since it has means, it is possible to eliminate the occurrence of wrinkles due to the influence of friction and slip acting between the impression cylinder and the web, so that the occurrence of defective printing can be reduced, and the preparation time for printing can be shortened, The productivity of web printing is improved, and the cost of printed products can be reduced. further,
By providing the web transport means of the present invention in a web-fed rotary printing press, it is possible to widen the range of web types, widths, thicknesses, ink types and characteristics, and other printing conditions applicable to one printing press. Thus, it is possible to produce printed materials using various webs and various inks with a small number of printing presses.

According to a second aspect of the present invention, there is provided a web-fed rotary printing press according to the present invention, in addition to the first aspect, the position of the impression cylinder and the position of the guide roller for introducing the web into the impression cylinder. Or, by moving the position of the guide roller that derives the web from the impression cylinder singly or in combination, the running path of the web can be varied in various ways, so depending on the material, thickness, width, etc. of the web Even if wrinkles occur, by changing the running route of the web in various ways, it is possible to easily determine the conditions for selecting a running route that does not cause wrinkles on the web. Therefore, it is possible to easily and quickly manufacture a printed material using a web, ink, or the like, which easily causes wrinkles.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a web traveling path according to a first embodiment.

FIG. 2 is a cross-sectional view illustrating a web traveling path according to a second embodiment.

FIG. 3 is a cross-sectional view illustrating a web traveling path according to a third embodiment.

FIG. 4 is a cross-sectional view illustrating a web traveling route according to a fourth embodiment.

FIG. 5 is a cross-sectional view illustrating an example of a configuration of a printing unit of the web-fed rotary printing press.

FIG. 6 is a cross-sectional view illustrating a web traveling path of a printing unit.

FIG. 7 is a cross-sectional view illustrating a web traveling path during printing of a printing unit.

FIG. 8 is a side perspective view illustrating a schematic configuration of a printing unit of a web-fed rotary printing press.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 web-fed rotary printing press 2a, 2b, 2c printing unit 3 web 4 ink 10 printing section 10, 10a, 10b, 10c printing section 11 plate cylinder 12 impression cylinder 20, 20a, 20b, 20c guide roller group 21 web introduction guide roller 22 web Outgoing guide roller 23 Web supply guide roller 30, 30a, 30b, 30c Drying section

Claims (2)

[Claims] 1. A web-fed rotary printing press, characterized in that a printing section is provided with web transport means capable of running the web away from the impression cylinder. 2. The travel of the web by moving the position of the impression cylinder, the position of the guide roller for introducing the web into the impression cylinder, or the position of the guide roller for leading the web from the impression cylinder, alone or in combination. 2. The web-fed rotary printing press according to claim 1, wherein the web-conveying means changes a path.