JP2000229399A - Cylinder arrangement of perfecting multi-color sheet offset press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce paper supply changing frequency and to improve the efficiency of work for changing a plate and others by a method in which in cylinder arrangement, plate and rubber cylinders are interlocked with an impression cylinder on the upper and lower sides of the impression cylinder, each plate cylinder shaft center is set on the vertical tangential line on the periphery of the impression cylinder, and each rubber cylinder shaft center is set at a position shifted slightly in the impression cylinder shaft center direction. SOLUTION: Eight plate cylinders 1 and eight rubber cylinders 2 have equal diameters, the diameters of four impression cylinders 3 are four times as large as those of the plate cylinders and the rubber cylinders, and a five cylinder type two-color printing unit is formed by the combinations A, B, C, D of two plate cylinders 1, two rubber cylinders, and one impression cylinder. In A and C, the rubber cylinders 2 are contacted with each other above the impression cylinder 3, the plate cylinders 1 are contacted with each other above the rubber cylinders 2. In B and D, the rubber cylinders 2 are contacted with each other below the plate cylinders 3, and the plate cylinders are contacted with each other below the rubber cylinders 2 so that the impression cylinders 3 are connected horizontally to each other. The shaft center O1 of the plate cylinder 1 is on the vertical tangential line 5 of the impression cylinder 3, and the shaft center O2 of the rubber cylinder 2 is at a position shifted slightly in the direction of a vertical center line 6 passing through the shaft center O3 of the impression cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a single sheet of paper.
The present invention relates to a cylinder arrangement of a unit-type sheet-fed double-sided multicolor offset printing press capable of performing multicolor printing on both sides of a sheet by continuous threading.

[0002]

2. Description of the Related Art When performing multi-color offset printing on both the front and back sides of a sheet of paper, there have been known various types of special-purpose machines for double-sided multi-color printing which perform the printing by passing the printing machine only once. ing. One such example is disclosed in Japanese Patent Publication No. Hei 3-21346, which was previously proposed by the present applicant. It is a five-cylinder two-color printing unit in which a common impression cylinder in contact with the two blanket cylinders from the lateral direction is three times the plate and the blanket cylinder diameter, and the arrangement of the blanket cylinder with respect to the impression cylinder is left and right. This is a double-sided four-color printing offset printing press having a cylinder arrangement in which a plurality of sets of different printing units are provided and printing units of different printing units are alternately connected in a zigzag manner in the vertical direction. More specifically, the sheet fed to the printing press is transported upward from below while being held between the impression cylinders, and is transferred between the printing units (intermediate cylinder). Does not exist.

The above-described apparatus is intended to improve registration accuracy by reducing the number of times of paper change by the cylinder as compared with a conventionally known two-sided four-color printing machine, and to reduce the size of the machine. It was intended to improve the operability, and a reasonable effect could be expected. However, as is apparent from the description of the embodiment, in this configuration, the size of the sheet to be printed is in the Kikuhan trial (469 mm).
The paper size is relatively small (about 636 mm). Since the paper width is short, it is not expected that a printing worker will work between plate cylinders of each printing unit.
The work required to install and remove the plate, clean, rubberize, clean the blanket cylinder, and perform other maintenance is done by reaching out from both sides of the machine.

By the way, a unit-type single-sided multi-color printing press that is now in general use has been examined.
× 1091 mm) or chrysanthemum paper (636 mm × 939 m)
In a large-sized printing press for large-sized paper such as m), the above-mentioned printing operation is usually performed by a person entering a work space formed between plate cylinders of a printing unit.

[0005] This has been followed by unit-type double-sided multi-color printing machines which have become more popular in recent years, and the mainstream printing units are those which are connected in the horizontal direction. One example can be seen in the description of JP-A-6-336003. This is plate, rubber, pressure 3
A single-color printing unit including a plurality of cylinders is used to perform double-sided multi-color printing.In this embodiment, the printing cylinders of the printing units are connected horizontally and the printing cylinders of each printing unit are connected. In FIG. 2, there is shown one that is connected horizontally with two intermediate cylinders (transfer cylinders) interposed therebetween. In detail, the single-color printing unit functions as a front-side printing unit in which the plate cylinder / rubber cylinder is located above the impression cylinder and a back-side printing unit in which the plate cylinder / rubber cylinder is located below the impression cylinder. They are connected alternately as described above. Incidentally, the diameter of the impression cylinder is twice as large as the diameter of the plate cylinder / rubber cylinder, and the diameter of the three cylinders is the same.

Examining the total number of cylinders used for each of the four-color printings on both sides disclosed in the above-mentioned publication, it is necessary to use 24 impression cylinders using double cylinders and 30 impression cylinders up to the same diameter. . In addition, the number of gripping by the claws between the impression cylinders at the time of sheet conveyance is 7 times, and when the intermediate cylinder is included, the number is further increased by 1.
It turns out that it is twice.

[0007] Further, the back side printing part by the above-mentioned cylinder arrangement is:
The back printing unit is lined up with a blanket cylinder and a plate cylinder located below the impression cylinder, while workers enter during maintenance,
Other operations are performed. This is clear from the comparison between man and machine in the attached drawings of the publication and the description of the specification, and it can be read that the size is large in consideration of the size of the target printing paper (for example, 488 m2 paper 788 m2).
mx 1091 mm), Kikuzen paper (636 mm x 939 m)
m). This torso arrangement is now tentatively forty-six and a half trials (545 mm x
788 mm) and a relatively small paper size of about half a chrysanthemum trial (469 mm × 636 mm). It is reasonable and efficient to select a small body diameter in design. Inevitably, the machine will be downsized, but the operators who handle it will remain the same. In order to be able to work between printing units, the lower half of the machine must be raised only for that purpose until it is comparable to a large machine (even in the case of the example drawings, In addition, if the diameter of the cylinder is reduced, the interval between the printing units becomes dull. In short, this cylinder arrangement cannot be applied to a two-sided multicolor printing machine that prints on a paper size about half a chrysanthemum.

[0008] In recent years, demand for small-sized multi-color printing machines mainly for printing in the size of a quarter-trim and half-trim has been expected. However, the structure disclosed in the Japanese Patent Publication No. 3-213346 proposed by the applicant of the present application does not become popular with existing workers because of its special form as described above and hinders its spread.

In a multicolor printing machine, it is extremely desirable from the viewpoint of working efficiency that the rotational phase of each plate cylinder is always the same throughout all printing units. This is because, for example, if the rotation phases of the plate cylinders of all the printing units are the same at the time of plate change, the plate changing operation of all the plate cylinders can be performed simultaneously by different workers. In the case where the impression cylinders of the five-cylinder printing unit are connected in a zigzag manner as in the above-described two-sided four-color printing offset printing press, the height of the cylinder is reduced, although the height is reduced and the effect is reduced. The phases cannot be aligned.

[0010]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances, and in performing double-sided multicolor printing on paper of the size of a 46-half trial and a chrysanthemum half-trial, the number of paper grips to be changed by a torso nail. As much as possible, with a small number of cylinders without transfer cylinders, and a work space that allows people to enter and work between plate cylinders. Another object of the present invention is to provide a cylinder arrangement for a sheet-fed double-sided multi-color offset printing press for the above-mentioned purpose.

Further, the following describes the invention achieved with the above-mentioned intention as a base and discloses as an improved invention thereof. The printing paper is seasoned in the first place, but if printing pressure is applied, it is inevitable that the printing paper will be stretched. In particular, the maximum elongation is measured during the first printing. Therefore, if the paper can be pressurized and stretched in advance, the above-mentioned amount of stretching becomes extremely small, and a good result can be obtained in the register accuracy in multicolor printing. Therefore, the improved invention is intended to press the unprinted sheet in the process of being conveyed on the impression cylinder with a simple configuration, and aims at further improving the registration accuracy. . Incidentally, the above-mentioned pressurizing means can be specially provided only in the cylinder arrangement configuration described in claim 1 of the claims.

[0012]

Means for Solving the Problems The present invention has the following arrangement to achieve the above object. That is, in a unit-type sheet-fed double-sided multicolor offset printing press, in which the cylinder arrangement of each connected printing unit is a five-cylinder two-color printing unit in which the printing units are mutually different, The impression cylinder in the two-color printing unit is
To have a diameter equal to four times the diameter of the plate or blanket cylinder,
There are two types of cylinder arrangements, the upper and lower sides of the plate and blanket cylinder being interlocked with the impression cylinder above the impression cylinder and the lower side being interlocked with the impression cylinder. In addition, each plate cylinder axis of the printing unit is specified so as to be located on a vertical tangent line on the outer periphery of the impression cylinder, and each blank cylinder axis is set at a position slightly shifted in the direction of the impression cylinder axis. And a cylinder arrangement of a sheet-fed double-sided multicolor printing offset printing machine characterized by a configuration in which one or more sets of printing units having different arrangements are arranged and connected so that their impression cylinders are arranged horizontally. .

[0013] The improved invention is based on the premise that a substrate having a cylinder arrangement of the above-described sheet-fed double-sided multicolor offset printing press is used as a base, and the pressure in the printing unit located on the paper feeder side is adjusted. A paper having the same diameter as the blanket cylinder and being interlocked with the blanket cylinder is provided in a space around the barrel, that is, a large peripheral space formed because the impression cylinder is four times the diameter of the plate and blanket cylinder. 1 is a cylinder arrangement of a sheet-fed double-sided multicolor offset printing press, characterized in that a stretching cylinder is specially provided.

[0014]

It is needless to say that all of the above impression cylinders are provided with paper holding claws at four locations around the circumference of the cylinder. Since the change of the paper between the printing units is performed at the place where the paper gripping claw is encountered, the number of times of the paper between the printing cylinders is reduced when the two-sided four-color printing machine is configured, that is, the total of two sets of the printing units which are different from each other is 4 in total. Three times when the printing units are alternately connected, and once when the two-color two-color printing machine is configured, that is, once when the printing units having the different colors are connected to each other.

In addition, the sheet from the paper feed mechanism is printed on the first impression cylinder in two colors on the front side, and this printing paper is replaced with the next impression cylinder and printed on the two colors on the back side. By adopting a configuration in which a paper discharge mechanism is connected to the impression cylinder, multicolor printing of two colors for each side can be achieved by a single paper change. In the case of a two-sided four-color printing machine, since four impression cylinders are connected, there are three locations between the cylinders, and the paper gripper is connected three times to the paper discharge mechanism. The reason that the number of times of paper holding between the cylinders is small is an advantage that the present invention employs a five-cylinder two-color printing unit to form a two-sided multicolor printing cylinder arrangement as described above.

In particular, according to the present invention, the impression cylinders of each printing unit are connected in a horizontal line without any unevenness in the horizontal direction, and each plate cylinder axis is specified so as to be positioned on a vertical tangent line on the outer periphery of the impression cylinder. The spacing between the plate cylinders is constant and the diameter of the impression cylinder is four times larger than the diameter of the plate cylinder and the diameter of the blanket cylinder. Even so, a sufficient working space between the plate cylinders can be secured.

Further, according to the present invention, among the plate cylinders of the printing unit arranged for surface printing, the rotation phases of the first color plate cylinder and the third color plate cylinder become the same phase, and the second color plate cylinder and the fourth color plate are rotated. The torso is in phase. Similarly, the rotation phases of the plate cylinders belonging to the printing unit arranged for the reverse printing are the same in the rotation phases of the first color cylinder and the third color cylinder, and the second color cylinder and the fourth color cylinder are the same. Phase. Furthermore, the rotational phase of the plate cylinder with respect to the impression cylinder of the printing unit for reverse printing is completely identical to the rotational phase of the printing unit with respect to the impression cylinder of the front printing unit. This helps to improve the efficiency of printing operations such as plate change.

It is to be noted that setting each blanket cylinder axis at a position slightly shifted in the direction of the impression cylinder axis is to prevent interference between the body gear of the blanket cylinder and the body gear of the impression cylinder in the continuous printing unit. It is a measure.

According to the improved invention, the blanket cylinder and the blanket cylinder are formed in the space around the impression cylinder as described above, that is, in the large peripheral space formed because the diameter of the impression cylinder is four times the diameter of the plate and blanket cylinder. Since the rolling cylinder for paper stretching having the same diameter is arranged and linked to the impression cylinder, it is possible to press the unprinted sheet immediately before printing with a simple configuration.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic side view showing an entire sheet double-sided multi-color offset printing press according to the present invention as a double-sided four-color printing press according to one embodiment. FIG. 2 is a detailed explanatory view showing a trunk arrangement mode which is a main part of the present invention. In the drawings, illustrations of an inking mechanism, a dampening mechanism, and the like, which are not related to the description of the main parts of the present invention, are omitted, and the same reference numerals are given to parts that indicate common parts throughout the drawings. is there.

Reference numeral 1 in the drawing indicates eight plate cylinders,
Reference numeral 2 denotes eight blanket cylinders. The plate cylinder 1 and the blanket cylinder 2 have the same diameter. Reference numeral 3 denotes four impression cylinders. The impression cylinder has a diameter four times that of the plate cylinder and the blanket cylinder, and a paper holding claw 4 is provided at a position equally divided on the peripheral surface 4. A, B, C, and D each indicate a so-called five-cylinder two-color printing unit formed by combining the plate cylinder 1 and the blanket cylinder 2 with two cylinders and one impression cylinder. Among them, A and C are modes in which the blanket cylinder 2 contacts the impression cylinder 3 and the plate cylinder 1 contacts the blanket cylinder 2. B and D are provided below the impression cylinder 3.
Are in contact, and the plate cylinder 1 is in contact with the blanket cylinder 2 below.
In other words, A and C and B and D are vertically different from each other. A and B, C, D alternately
Are connected so that the impression cylinders 3 are horizontal.

FIG. 2 shows the above-described five-cylinder two-color printing unit and a cylinder arrangement formed by connecting the units. Axis O ₁ of the plate cylinder 1 is located on the vertical tangent 5 of the impression cylinder 3, the position of the axis O ₂ of the blanket cylinder 2 in the vertical center line 6 direction passing through the axis O ₃ of the impression cylinder 3 , Is set at a slightly shifted position. That is, gear interference between the blanket cylinder gear (not shown) and the impression cylinder gear (not shown) is prevented, and the gap between the blanket cylinders on the impression cylinder is positioned as wide as possible.

With the above construction, the intervals 7, 8, 9, 10 between the plate cylinders on the impression cylinder and the intervals 1 between the printing units 1
Both 1 and 12 have the same interval. As for the blanket cylinder interval, the interval on the impression cylinder of the printing units A and C for front side printing and the interval on the impression cylinder of the printing units B and D for backside printing are both the same and slightly smaller than the plate cylinder interval. However, the gap between the blanket cylinders between the printing units is widened accordingly, but the difference is so small that there is no hindrance to the formation of the work space.

A paper feed mechanism comprising a swing mechanism 13 and a paper feed transfer cylinder 14 is connected to the impression cylinder 3 of the paper feed side printing unit A, and the paper discharge cylinder 15 is attached to the impression cylinder 3 of the paper discharge side print unit D. And a paper discharge mechanism including the chain transport device 16 are connected. Reference numeral 17 denotes a sheet that has been discharged and stacked, and reference numeral 18 denotes a paper feeder 19.
The reference numeral 20 denotes a sheet feed plate. The outline 21 indicates the frame of the entire printing press including the frame of the sheet discharging device, and is formed by combining appropriately divided parts in manufacturing.

In the above-described printing machine, after the sheet 18 of the paper feeder 19 is held from the paper feed transfer cylinder 14 to any of the paper holding claws 4 (not shown) of the impression cylinder 3 of the printing unit A, FIG. Is sent to the paper discharge cylinder 15 via the path shown by the bold line. Replacement of the paper between the impression cylinders is where the nail 4 encounters 2
Three times at 2, 23, and 24 points. During transport, the sheet is printed in two colors on the front side in the printing unit A, two colors on the back side in B, and two colors on the front side in C and D on the back.
, Two additional colors are printed on the back side, and four-color printing on both sides is completed.

Although the illustration is omitted, in order to implement the present invention for two-sided two-color printing, the printing units A and D in the above embodiment are directly connected, and the printing units B and C are omitted. What is necessary is just to configure. Two-color printing on both sides can be achieved with only one change of paper between impression cylinders. Others are the same as the first embodiment.

In order to implement the present invention for double-sided six-color printing (not shown), the five-cylinder two-color printing units A, B, C, and D shown in FIG. , A, B, C, B, C, and D.

Next, the structure of FIG. 1 will be described in further detail with reference to FIG. 2 by referring to FIG. 2. According to the present invention, the size of the paper to be printed is, for example, a quarter-size trial (545 mm).
× 788mm), half chrysanthemum trial (469mm × 636mm)
It is suitable for double-sided multi-color printing of relatively small paper size such as. (If the body diameters for the 46 and half trials and the chrysanthemum trial are designed to be the same, there will be more common parts in the configuration, which is advantageous for parts management).

If the plate and blanket cylinder diameter is set to 240 mm, the diameter of the impression cylinder is 960 mm, which is four times as large as that of the press cylinder. Therefore, the space between the plate cylinder axes is also 960 mm. , 9, 10, and 1 between each printing unit
That of 1, 12 is 720 mm. Although the working space is smaller than that of the dampening mechanism (not shown), it does not hinder a person from intervening and working. By the way, although there is a slight dislike in the case of the present example as the body diameter used in the four-and-a-half trial and the chrysanthemum half trial, the present invention has many advantages as compared with the conventional machine, so there is no room to cover it. The selection of the body diameter is not limited to this example, and the design to further reduce the diameter in consideration of the working space is free.

Next, the rotational phase of the plate cylinder will be described. When a printing plate for 46-half cut paper printing is wound around a plate cylinder having a diameter of 240 mm, the angle including the circumference becomes 260 degrees or more. For easy understanding, FIG. And presented. As can be seen at a glance, since the impression cylinders of the respective printing units are arranged side by side and connected to each other, the printing units A and C and B and D have the relative positions of the impression cylinder 3 blanket cylinder 2 plate cylinder 1. It will be exactly the same. That is, since the rotation phases are aligned, the first color and the third color can be simultaneously changed, and the second color and the fourth color can be changed simultaneously by slightly rotating.

As shown in the drawing, the structure of the improved invention which is still another embodiment is as shown in the drawing. A rolling cylinder 25 for stretching the paper is arranged in the space between the two. The rolling cylinder 25 for paper stretching has the same diameter as the blanket cylinder 2 and is formed in the same shape as the blanket cylinder 2, and is interlocked with the impression cylinder 3. The adjustment of the contact pressure to the impression cylinder 3 is also configured such that the cylinder itself is advanced and retracted similarly to the blanket cylinder 2. Since this device is a well-known matter, the description is omitted. Since the improvement of the present invention can press the unprinted sheet in the transport state immediately before printing, it is possible to further improve the registration accuracy in combination with the configuration in which the number of paper grips by the impression cylinder is small. Improvement can be expected. If necessary, a dampening mechanism may be added to the rolling cylinder 25 for stretching the paper, so that the printing paper being conveyed can be pressurized simultaneously with humidification. The dampening water mechanism may have the same configuration as that of a conventionally known plate.

[0032]

As described above, the present invention provides a five-body type 2
In addition to reducing the number of paper grips between impression cylinders with a configuration in which color printing units are connected without using a transfer cylinder,
Since the impression cylinder is arranged in a horizontal line and connected horizontally in the same manner as the above-mentioned constitution in which the impression cylinder is particularly a quadruple cylinder, when it is carried out on a two-sided multi-color printing machine of the size of a half-trim and half-trim, It is easy to set up a work space between plate cylinders. In addition, since the rotational phases of the plate cylinders are in the odd-numbered and even-numbered phases, respectively, the rotational phases of the plate cylinders are in the same phase. According to this configuration, the printing is performed between the rubber and the impression cylinders instead of the printing through the paper between the blanket cylinders as performed in a so-called BB type double-sided printing press.
Sharp printing with better rubbing compared to the type is possible.

The improved invention can be implemented only by using the above-mentioned cylinder arrangement as shown above. Regardless of the type of the conventional unit-type printing press, it is impossible to provide the rolling machine for paper stretching as described in the present application in the printing press itself. This is because there is no installation space. In the present application, a paper stretching process can be added immediately before an unprinted paper is subjected to a printing pressure between the impression cylinder and the blanket cylinder, so that the intended purpose can be achieved with a simple configuration without requiring a large-scale device.

[Brief description of the drawings]

FIG. 1 is an overall side schematic view showing a sheet-fed double-sided multicolor offset printing press according to the present invention, together with its cylinder arrangement.

FIG. 2 is a detailed explanatory view showing a trunk arrangement mode which is a main part of the present invention.

[Explanation of symbols]

1 ... plate cylinder, 2 ... blanket cylinder, 3 ... impression cylinder,
4 ... gripper, 5 ... vertical tangent line of the impression cylinder (plate cylinder center line), 6 ... vertical center line of the impression cylinder, 7, 8, 9,
10, 11, 12 ... interval between plate cylinders, A, B,
C, D ... 5 cylinder 2-color printing unit, 13.
・ Swing mechanism, 14 ・ ・ ・ Paper feeding cylinder, 15 ・ ・ ・
Paper discharge cylinder, 16 ... Chain transport device, 19 ...
Paper feeder, 21 ... frame outline, 22, 23, 2
4 ... the impression cylinder claws of the encounter point, 25 ... paper stretched out for a rolling body, _{O 1,} ··· plate cylinder axis, _O 2 ··· blanket cylinder _{axis, O} 3 ··· impression cylinder axis heart.

Claims (2)

[Claims] 1. A unit-type sheet-fed double-sided multicolor offset printing press, wherein the cylinder arrangement of each connected printing unit is a five-cylinder two-color printing unit which is different from each other. The impression cylinder in the five-cylinder two-color printing unit is configured to have a diameter four times as large as the diameter of the plate / rubber cylinder which is the same diameter. The two types are provided in such a way that the upper and lower sides of the form interlocking with the impression cylinder and the form interlocking with the impression cylinder at the lower side are different from each other. It is specified to be located on a direct line, and each blanket cylinder axis is set to a position slightly shifted in the direction of the impression cylinder axis. Arrange and connect the impression cylinders horizontally Configuration cylinder arrangement of the sheet double-sided multicolor offset printing press, wherein a. 2. A unit-type sheet-fed double-sided multicolor offset printing press, wherein the cylinder arrangement of each connected printing unit is a five-cylinder two-color printing unit which is mutually different. The impression cylinder in the five-cylinder two-color printing unit is configured to have a diameter four times as large as the diameter of the plate / rubber cylinder which is the same diameter. The two types are provided in such a way that the upper and lower sides of the form interlocking with the impression cylinder and the form interlocking with the impression cylinder at the lower side are different from each other. It is specified to be located on a direct line, and each blanket cylinder axis is set to a position slightly shifted in the direction of the impression cylinder axis. Arrange and connect the impression cylinders horizontally In addition, the impression cylinder of the printing unit located on the paper feeder side has a roll cylinder for stretching the paper which has the same diameter as the blanket cylinder and is linked to the impression cylinder. The cylinder arrangement of a sheet-fed double-sided multi-color offset printing press, which is specially provided.