JP2000043229A - Perfecting sheet offset printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a perfecting sheet offset printer scarcely causing a printing fault having a reduced machine-size at a fart printing speed by alternately connecting a plurality of front surface printing units to a plurality of rear surface printing units via impression cylinders for constituting the respective units in a horizontal direction. SOLUTION: Front surface printing units 5a to 5d and rear surface printing units 6a to 6d are connected by horizontally connecting impression cylinders 11a to 11d, 12a to 12d for constituting the respective units 5a, 6a in such a manner that axial centers of the cylinders are coupled substantially linearly. Accordingly, a sheet P is delivered from a transfer cylinder 4 to the cylinder 11a of the unit 5a, its surface is printed with a first color, then transferred to the cylinder 12a of the unit 6a, and printed on its rear surface with the first color. Thereafter, similarly, the sheet P is alternately printed on both the front and rear surfaces of the sheet P by the second to four units 5b to 5d and the second to fourth units 6b to 6d with the second to the fourth colors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided printing sheet-fed offset printing press, and more particularly, to one-color or multiple-color offset printing on both sides of a sheet in a single pass. It relates to a printing press capable of doing so.

[0002]

2. Description of the Related Art Heretofore, as a sheet-fed offset printing press of this kind, a so-called reversing double-sided printing system, so-called B-
A type B double-sided printing type or another type is known.

The reversing type double-sided printing system includes a back side printing section, a front side printing section, a paper reversing section, and the like. After printing a plurality of colors on the back side of a sheet by the back side printing section, There is a printer in which the sheet is reversed by a paper reversing unit and transferred to a front-side printing unit, and a plurality of colors are printed on the surface of the sheet by the front-side printing unit (for example, see Japanese Patent Publication No. 1-56672).

In the above-mentioned BB type double-sided printing system, a plurality of blanket cylinders and impression cylinders having rubber blankets attached thereto are alternately arranged in the horizontal direction, and the upper portion of each blanket cylinder and each pressure cylinder are arranged. At the bottom of the cylinder, a plate cylinder, an ink mechanism, a dampening water mechanism, etc. are provided respectively to constitute a printing unit.Grippers are provided for each blanket cylinder and impression cylinder, and both sides of the blanket cylinder and impression cylinder are transported while the sheet is transported. Japanese Patent Application Laid-Open No. 58-14 / 1983
No. 7364 discloses this.

In another system, two pairs of plate cylinders and blanket cylinders arranged side by side are connected to a common impression cylinder having a diameter three times as large as those cylinders and having paper holding claws. A five-cylinder two-color printing unit is formed, and two sets of printing units are alternately arranged in the vertical direction so that the relative positions of the plate cylinder and the blanket cylinder with respect to the impression cylinder are different from each other. Each of the impression cylinders is connected so that the straight line connecting the axis of the cylinder forms a zigzag shape.The paper feeder is connected to the impression cylinder located at the bottom, and the paper ejection device is connected to the top impression cylinder. Japanese Patent Publication No. 3-21346 discloses a double-sided printing sheet-fed offset printing press configured to print four colors in two color units on both sides of paper.

[Problem] However, in the above-mentioned reversing type double-sided printing system, single-sided printing is carried out because of the mechanism in which the rear end of the sheet conveyed by the reversing cylinder and folded is gripped by a gripper. The printing speed is lower than that of the press, and the register accuracy of printing is easily lost. When changing the sheet size of the sheet, it takes time and effort to change the gripper changing position by the gripper at the rear end of the sheet. There is a limit to the paper size that can be supported. Since the reversing mechanism requires two paper transfer cylinders and a reversing cylinder, there are disadvantages such as an increase in the overall length of the printing press.

In the above-described BB type double-sided printing system, since printing is performed simultaneously on both sides of a sheet, the structure is
Since the printing paper may come into contact with the blanket cylinder to which the ink has adhered to cause printing troubles such as stains and double phenomena, a countermeasure is required. Due to an error in the blanket thickness, there may be a case where a slight difference occurs in the tailoring dimensions of the two blanket cylinders, causing double filing or the like. The BB double-sided printing method has a disadvantage that the printed matter is not sharp because there is no impression cylinder serving as a reference surface when printing pressure is applied.

The double-sided printing press described in Japanese Patent Publication No. 3-21346 is suitable for printing small-sized paper sheets, and prints relatively large-sized paper sheets. Such a configuration is not realistic considering the overall height of the printing press and the building of the printing factory.

[0009]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above, and simultaneously solves the above-mentioned various inconveniences so that the printing speed is high, the printing trouble hardly occurs, and the machine size is reduced. It is an object of the present invention to provide a new double-sided printing sheet-fed offset printing press.

[0010]

In order to achieve the above object, a double-sided printing sheet-fed offset printing press according to a first aspect of the present invention comprises a blanket cylinder, a plate cylinder, And an inking mechanism is provided to form the front printing unit, and a blanket cylinder, a plate cylinder and an inking mechanism are provided below the impression cylinder provided with a paper holding claw to form a back printing unit, and the front printing unit and The printing unit is characterized in that the printing units are connected to the back side printing units by an impression cylinder constituting each printing unit.

According to a second aspect of the present invention, a double-sided printing sheet-fed offset printing press forms a front printing unit by providing a blanket cylinder, a plate cylinder, and an inking mechanism above an impression cylinder provided with a paper holding claw. A backside printing unit is formed by providing a blanket cylinder, a plate cylinder, and an inking mechanism below the impression cylinder provided with paper holding claws, and the front side printing unit and the backside printing unit, and the impression cylinder constituting each of the printing units. In this case, a plurality of connections are alternately provided in the horizontal direction.

Further, in the double-sided printing sheet-fed offset printing press according to the third aspect, a blanket cylinder, the plate cylinder, and the inking mechanism are provided above the impression cylinder provided with a paper holding claw and having the same diameter as the plate cylinder. To form a front side printing unit, a paper holding claw is provided, and a blanket cylinder, a plate cylinder and an inking mechanism are provided below an impression cylinder having the same diameter as the plate cylinder to form a back side printing unit. Two printing presses forming the front and back printing units are connected in the horizontal direction to form one unit of front and back printing unit, and the one front and back printing unit is provided with paper holding claws. , A plurality of them are connected in a horizontal direction via an intermediate body.

According to the above construction, in the two-sided sheet-fed offset printing press according to the first aspect, the sheet is supplied to the paper holding claw provided on the impression cylinder of the front side printing unit and the impression cylinder of the back side printing unit. The paper is sequentially changed by the provided paper holding claw and conveyed. During the transfer, a blanket cylinder provided at the upper part of the impression cylinder, a surface printing unit formed by the plate cylinder and the inking mechanism, and a blanket cylinder formed at the lower part of the impression cylinder, the plate cylinder and the inking mechanism were formed. The back side printing unit can print on both sides of a sheet.

Further, in the double-sided printing sheet-fed offset printing press according to the second aspect, the sheet is provided by a paper holding claw provided on the impression cylinder of the front side printing unit and a paper holding claw provided on the impression cylinder of the back side printing unit. They are sequentially changed and conveyed in the horizontal direction. During the transfer, a blanket cylinder provided at the upper part of the impression cylinder, a surface printing unit formed by the plate cylinder and the inking mechanism, and a blanket cylinder provided at the lower part of the impression cylinder,
The back printing unit formed by the plate cylinder and the inking mechanism can print a plurality of colors alternately on both the front and back surfaces of a sheet.

Further, in the double-sided printing sheet-fed offset printing press according to the third aspect, the sheet is formed from a paper gripper provided on the impression cylinder of the front side printing unit to a paper gripper provided on the impression cylinder of the back side printing unit. In addition, it is transported horizontally. During the transfer, a surface printing unit formed by a blanket cylinder, a plate cylinder and an inking mechanism provided at the upper part of the impression cylinder, and a surface printing unit formed by a blanket cylinder, a plate cylinder and an inking mechanism provided at the lower part of the impression cylinder One unit of the front and back printing unit including the back printing unit can print one color on each of the front and back surfaces of the sheet. Next, the sheet is transferred to the two intermediate cylinders by the grippers and then to the impression cylinder of the next one-side printing unit. Then, the second color printing can be performed on both sides of the sheet by the front and back printing units.
Hereinafter, a plurality of colors can be printed on both sides of the sheet by the same process as described above. In that case, when the impression cylinders of the front side printing unit and the back side printing unit are connected in the horizontal direction with the same diameter as the plate cylinder, and a plurality of units are connected via two intermediate cylinders using them as one unit. Thus, the overall height of the printing press can be kept low. Further, maintenance and other operation spaces can be formed between the plurality of front side printing units and between the plurality of back side printing units.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to nine illustrated embodiments.

FIG. 1 is a schematic side view of a double-sided sheet-fed offset printing press according to a first embodiment, in which a sheet P piled on a feeder body 1 includes a feeder board 2. Is fed to the printing unit A via the swing device 3 and the transfer cylinder 4, and is printed on both front and back sides of the sheet P.

The printing section A includes one front printing unit 5a and one back printing unit 6a. The front side printing unit 5a includes a blanket cylinder 7a,
A plate cylinder 9a, an impression cylinder 11a provided with a paper holding claw (not shown) and having the same diameter as the plate cylinder 9a, an inking mechanism 13a, and a water supply mechanism
The blanket cylinder 7a, the plate cylinder 9a, the inking mechanism 13a and the water supply mechanism 15a are provided above the impression cylinder 11a.
Are formed.

The back printing unit 6a is provided with a blanket cylinder 8a, a plate cylinder 10a, and a paper holding claw (not shown) as in the above-described front printing unit 5a.
impression cylinder 12a, inking mechanism 14a and water supply mechanism having the same diameter as a
16a and the like, and is formed by connecting a blanket cylinder 8a, a plate cylinder 10a, an inking mechanism 14a, and a water supply mechanism 16a to a lower portion of the impression cylinder 12a.

In the double-sided printing sheet-fed offset printing press of the first embodiment, the front side printing unit 5a and the back side printing unit 6a formed as described above are connected. In that case, the impression cylinders constituting the printing units 5a and 6a on the front and back sides
11a and 12a are connected in the horizontal direction, and each of the impression cylinders 11a and 12a is connected so that a line connecting the axis of the impression cylinder becomes oblique.
12a may be connected. Reference numeral 17 denotes each of the impression cylinders 11a and 12 described above.
This is an ink drying device provided near a.

With such a configuration, the sheet P is transferred from the transfer cylinder 4 to the impression cylinder 11a of the front printing unit 5a, the printing is performed on the front surface, and then transferred to the impression cylinder 12a of the back printing unit 6a. The back side is printed.

Reference numeral 20 denotes a delivery cylinder connected to the impression cylinder 12a, reference numeral 21 denotes a sprocket, and reference numeral 22 denotes a delivery chain with a gripper driven by the sprocket 21, and the sheet P after printing is delivered from the impression cylinder 12a. The paper is discharged onto a paper discharge table 23 by a chain 22 with a gripper via a drum 20.

In the first embodiment, the impression cylinder 11a of the front printing unit 5a and the impression cylinder 12a of the back printing unit 6a have been described as having the same diameter as the plate cylinders 9a and 10a. An impression cylinder having a diameter twice or more as large as 10a may be used. Further, the rear side of the back side printing unit 6a may be used. Further, the front side printing unit 5a may be connected to the rear side of the back side printing unit 6a.

[Second Embodiment] FIG. 2 is a schematic side view of a two-sided four-color printing sheet-fed offset printing press according to a second embodiment.
The sheet P piled in the feeder main body 1 is fed to the printing unit B via the feeder board 2, the swing device 3, and the transfer cylinder 4, and is printed on each of the front and back sides of the sheet P in four colors. Is what is done.

The printing section B includes four front side printing units 5a to 5d and four back side printing units 6a to 6d. The first to fourth color front side printing units 5a to 5d are the front side printing units 5a of the first embodiment.
The back printing units 6a to 6d of the first to fourth colors are formed in the same manner as the back printing unit 6a of the first embodiment, except that the impression cylinders 11a and 12a have twice the diameter of the plate cylinders 9a and 10a. Therefore, the same reference numerals are given to the drawings and detailed description is omitted.

The two-sided, four-color, sheet-fed offset printing press of the second embodiment has the front side printing units 5a, 5b, 5c, 5d and the back side printing units 6a, 6 formed respectively as described above.
b, 6c, 6d are connected alternately, for example, the first color front side printing unit 5a, the first color back side printing unit 6a, and then the second color front side printing unit 5b. It is. In this case, the impression cylinders 11a to 11 that constitute the printing units 5a to 5d and 6a to 6d on the front and back sides, respectively.
d, 12a to 12d are connected in the horizontal direction, and as shown in FIG. However, the impression cylinders 11a to 11d and 12a to 12d may be connected so that the line segment connecting the impression cylinder axes becomes zigzag. Reference numeral 17 denotes an ink drying device provided near each of the impression cylinders 11a to 11d and 12a to 12d.

With such a configuration, the sheet P is transferred from the transfer cylinder 4 to the impression cylinder 11a of the first front-side printing unit 5a, and the first color printing is performed on the front side thereof. The first color is transferred to the impression cylinder 12a of 6a and printed on the back surface thereof. Then, the second to the same as above
The fourth front side printing units 5b to 5d and the second to fourth back side printing units 6b to 6d alternately print the second to fourth colors on both the front and back sides of the sheet P.

Reference numeral 20 denotes a delivery cylinder connected to the last impression cylinder 12a, reference numeral 21 denotes a sprocket, and reference numeral 22 denotes a sprocket 21 thereof.
The sheet P after printing is discharged from the impression cylinder 12a via the delivery cylinder 20 to the sheet discharge table 23 by the gripper chain 22 via the delivery cylinder 20.

Third Embodiment FIG. 3 shows a third embodiment and is a schematic side view of a two-sided two-color sheet-fed offset printing press. In this case, the printing unit C is the first of the second embodiment,
Using the same as the second front side printing units 5a, 5b and the first and second back side printing units 6a, 6b, the impression cylinders 11a, 11b, 12a, 12b forming the printing units are connected in a horizontal direction. It is composed. The other parts of the configuration are the same as those of the second embodiment.

[Fourth Embodiment] FIG. 4 shows a fourth embodiment and is a schematic side view of a two-sided four-color printing sheet-fed offset printing press. In this case, the printing unit D is the same as the four front-side printing units 5a to 5d and the four back-side printing units 6a to 6d of the second embodiment, and is used for the first-color back-side printing unit 6a. Next, the first color front side printing unit 5a
Is followed by a second color printing unit 5b for each of the front and back surfaces, such as a printing unit 6b for the second color.
d are connected alternately, and the impression cylinders 11a to 11d and 12a to 12d forming the printing unit are connected in the horizontal direction.

With this configuration, the sheet P is directly transferred from the feeder board 2 to the impression cylinder 12a of the first back side printing unit 6a by the swing device 3 without the transfer cylinder 4 and the first color is printed on the back side. And then transferred to the impression cylinder 11a of the first surface printing unit 5a, where the first color printing is performed on the surface. Thereafter, printing of the second to fourth colors is performed alternately on the front and back surfaces of the sheet P in the same manner as described above. The rotation of the impression cylinder 11d is the delivery chain 22 with the gripper.
Is rotated in the opposite direction, the sheet P on which the printing of the fourth color has been completed is directly transferred to the chain 22 with the gripper without the delivery cylinder 20, and is discharged onto the discharge tray 23. The configuration of the other parts is the same as that of the second embodiment. Therefore, the structure is simplified by the absence of the transfer cylinder 4 and the delivery cylinder 20, and the machine length is also reduced.

Fifth Embodiment FIG. 5 shows a fifth embodiment and is a schematic side view of a two-sided two-color sheet-fed offset printing press. In this case, the printing unit E is the first of the fourth embodiment,
Using the same units as the second back side printing units 6a, 6b and the first and second front side printing units 5a, 5b, the impression cylinders 11a, 11b, 12a, 12b forming the printing units are connected in a horizontal direction. It is composed. The configuration of other parts is the same as that of the fourth embodiment, and therefore, the same reference numerals are given to the drawings and detailed description is omitted.

As shown in FIGS. 1, 2, 3, 4 and 5, spaces 18a to 18d provided between the back side printing units 6a to 6d are used for the back side printing units 6a to 6d.
It is configured to be able to perform maintenance and other operations on the.

Sixth Embodiment FIG. 6 shows a sixth embodiment of the present invention. FIG. 6 is a schematic side view of a single-sided, four-color sheet-fed offset printing press. The sheet P is fed to a printing unit via the board 2, the swing device 3, and the transfer cylinder 4, and printed on each of the front and back surfaces of the sheet P in four colors.

Hereinafter, the front printing unit 5a and the back printing unit 6a of the first color will be described for convenience. The front side printing unit 5a includes a blanket cylinder 7a, a plate cylinder 9a,
A paper holding claw (not shown) is provided and comprises an impression cylinder 11a, an inking mechanism 13a, a water supply mechanism 15a, and the like having the same diameter as the plate cylinder 9a. A blanket cylinder 7a, a plate cylinder 9a, It is formed by connecting the king mechanism 13a and the water supply mechanism 15a.

The back side printing unit 6a is provided with a blanket cylinder 8a, a plate cylinder 10a, and a paper holding claw (not shown) as in the case of the front side printing unit 5a.
impression cylinder 12a, inking mechanism 14a and water supply mechanism having the same diameter as a
16a and the like, and is formed by connecting a blanket cylinder 8a, a plate cylinder 10a, an inking mechanism 14a, and a water supply mechanism 16a to a lower portion of the impression cylinder 12a.

The impression cylinder 12a of the back side printing unit 6a is connected to the rear side of the impression cylinder 11a of the front side printing unit 5a in the horizontal direction, and the front and back printing unit G of the first color as one unit is formed.
Is configured. Since the front and back printing units H to J of the second to fourth colors are configured in the same manner as the front and back printing unit G of the first color, detailed description is omitted.

The double-sided four-color printing sheet-fed offset printing press according to the sixth embodiment includes the first to fourth colors formed as described above.
The color printing units G to J are connected in the horizontal direction by two intermediate cylinders 17 and 18 provided between the units. In that case, each printing unit 5 on the front and back
impression cylinders 11a to 11d, 12a constituting a to 5d, 6a to 6d
The first to fourth color front and back printing units G to J are connected so that the center axes of the intermediate cylinders 17 and 18 and the six intermediate cylinders 17 and 18 are substantially linear. However, the first to fourth color front and back printing units G to J may be connected so that the line connecting the trunk axis becomes zigzag.

With such a configuration, the sheet P is transferred from the transfer cylinder 4 to the impression cylinder 11a of the front printing unit 5a constituting the front and back printing unit G of the first color, and the first color is transferred to the front surface. Is printed, and then the back side printing unit 6
a is transferred to the impression cylinder 12a, and the first color is printed on the back surface. Thereafter, the sheet P is made up of two intermediate cylinders 17, 18
Are sequentially sent to the front and back printing units H of the second color, and further to the front and back printing units I and J of the third and fourth colors, and the front and back surfaces of the second to fourth printing colors are respectively applied to the front and back surfaces. It is to be printed.

Reference numeral 20 denotes a delivery cylinder connected to the last impression cylinder 12d, reference numeral 21 denotes a sprocket, and reference numeral 22 denotes the sprocket 21.
The sheet P after printing is moved from the last impression cylinder 12d to the delivery cylinder 20
Paper tray 23 by the delivery chain 22 with gripper
The paper is ejected on top.

Seventh Embodiment FIG. 7 shows a seventh embodiment and is a schematic side view of a two-sided two-color sheet-fed offset printing press. In this case, the printing unit uses the first and second printing units G and H of the first color and the second color of the sixth embodiment,
11a, 12a, 11b, 12b and intermediate cylinders 17, 18 are connected in a horizontal direction. As a result, the sheet P is made up of the impression cylinders 11a, 12a, the two intermediate cylinders 17, 18 and the impression cylinders 11b, 12b.
, And two colors can be printed on both sides of the sheet P. The configuration of other parts is
Since the sixth embodiment is the same as the sixth embodiment, the same reference numerals are given to the drawings and detailed description is omitted.

[Eighth Embodiment] FIG. 8 shows an eighth embodiment and is a schematic side view of a two-sided four-color printing sheet-fed offset printing press. In this case, the front side printing units 5a to 5d and the back side printing units 6a to 6d are the same as those in the sixth embodiment, and the front side printing units 5a to 5d are respectively provided behind the back side printing units 6a to 6d. The first to fourth color front and back printing units G1, H1, I1, and J1 are connected to form a first and fourth color printing units G1, H1, I1, and J1, and are connected in the horizontal direction by two intermediate cylinders 17 and 18 provided between the respective units G1 to J1. It is configured as follows.

Thus, the sheet P is transferred from the transfer drum 4 to the first
It is delivered to the impression cylinder 12a of the back printing unit 6a constituting the front and back printing unit G1 of the color, the first color printing is performed on the back surface, and then the impression cylinder 11 of the front printing unit 5a.
a, and the first color printing is performed on the surface. Thereafter, the sheet P is printed via the two intermediate cylinders 17 and 18 on the front, back and back printing units H1, I1,
The paper is sequentially fed to J1, and the printing of the second to fourth colors is performed on the front and back surfaces, respectively. Since the rotation of the impression cylinder 11d is opposite to the rotation of the delivery chain 22 with the gripper, the sheet P on which the printing of the fourth color is completed is directly transferred to the chain with the gripper 22 without the delivery cylinder 20. The paper is discharged onto the paper discharge table 23. The other parts of the configuration are the same as those of the sixth embodiment. Therefore, the structure is simplified by the absence of the delivery cylinder 20, and the machine length is also reduced. When the upper swing is used, the transfer drum 4 can be omitted.

[Ninth Embodiment] FIG. 9 shows a ninth embodiment, and is a schematic side view of a two-sided two-color sheet-fed offset printing press. In this case, the printing unit uses the first and second color front and back printing units G1 and H1 of the eighth embodiment,
The impression cylinders 12a, 11a, 12b, 11b and the intermediate cylinders 17, 18 are connected horizontally. As a result, the sheet P is made up of the impression cylinders 12a, 11a, the two intermediate cylinders 17, 18, the impression cylinder 12b,
11b, two colors can be printed on both sides of the sheet P. The other parts of the configuration are the same as those of the above-described eighth embodiment. When the upper swing is used, the transfer drum 4 can be omitted.

As shown in FIGS. 6, 7, 8, and 9, the front side printing units 5a to 5d and the back side units 6a to 6d
Impression cylinders 11a to 11d and 12a to 12d and two intermediate cylinders 17,
When 18 is connected in the horizontal direction with the same diameter as the plate cylinders 9a to 9d and 10a to 10d, the overall height of the printing press can be minimized. Further, the above-described front side printing unit 5
a and the back-side printing unit 6a constitute one unit of front-and-back-side printing units G, G1, and a plurality of similarly configured front-and-back-side printing units H, H1, I, I1, J, J1 are respectively intermediate two units. Since the connection is made via the cylinders 17 and 18, between the plurality of front side printing units 5a to 5d and the back side printing unit 6a
A space for maintenance and other operations is formed between 6 and 6d.

[0045]

The double-sided multicolor sheet-fed offset printing press according to the first aspect of the present invention comprises a blanket cylinder, a plate cylinder, and an inking mechanism provided above the impression cylinder provided with a paper holding claw. While forming the front side printing unit, a blanket cylinder, a plate cylinder and an inking mechanism are provided below the impression cylinder provided with a paper holding claw to form a back side printing unit, and the front side printing unit and the back side printing unit, the Because they were connected by the impression cylinder that composes each printing unit,
Since the sheet is delivered by the impression cylinder of the back side printing unit, printing can be performed on the front and back sides of the sheet. Therefore, there is an effect that the curl of the sheet can be extremely reduced.
Further, with the above configuration, there is an effect that the inconvenience in the reversing type / BB type / other type double-sided printing press can be solved.

According to a second aspect of the present invention, there is provided a double-sided multicolor printing sheet-fed offset printing press, in which a blanket cylinder, a plate cylinder, and an inking mechanism are provided above an impression cylinder provided with a paper holding claw to form a front printing unit. A backside printing unit is formed by providing a blanket cylinder, a plate cylinder, and an inking mechanism below the impression cylinder provided with paper holding claws, and the front side printing unit and the backside printing unit, and the impression cylinder constituting each of the printing units. Because, by connecting multiple alternately in the horizontal direction,
In addition to the above effects, the overall height of the printing press can be made relatively small, which is particularly effective for designing a large sheet size.

Further, in the double-sided multicolor printing sheet-fed offset printing press according to the third aspect, a blanket cylinder, the plate cylinder and the inking mechanism are provided on the impression cylinder provided with a paper holding claw and having the same diameter as the plate cylinder. Along with forming the front side printing unit, a paper holding claw is provided and a blanket cylinder, a plate cylinder and an inking mechanism are provided below the impression cylinder having the same diameter as the plate cylinder to form a back side printing unit. An impression cylinder that forms the front side printing unit and the back side printing unit is connected in the horizontal direction to form one unit of the front and back side printing unit, and the one unit of the front and back side printing unit is provided with two paper holding claws. Since a plurality of connections are made in the horizontal direction via the cylinder, in addition to the above effects, the overall height of the printing press can be reduced with the same printing dimensions. Further, a space for performing maintenance and other operations can be formed between the front side printing units and between the back side printing units.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a first embodiment of a double-sided multicolor printing sheet-fed offset printing press to which the present invention is applied.

FIG. 2 is the same view of the second embodiment.

FIG. 3 is the same view of the third embodiment.

FIG. 4 is the same view of the fourth embodiment.

FIG. 5 is the same view as that of the fifth embodiment.

FIG. 6 is the same view as in the sixth embodiment.

FIG. 7 is the same view as that of the seventh embodiment.

FIG. 8 is the same view as in the eighth embodiment.

FIG. 9 is the same view as in the ninth embodiment.

[Explanation of symbols]

5a, 5b, 5c, 5d Front side printing unit 6a, 6b, 6c, 6d Back side printing unit 7a, 7b, 7c, 7d Front side printing unit 5a-5
d blanket cylinder 8a, 8b, 8c, 8d Back side printing units 6a-6
d blanket cylinder 9a, 9b, 9c, 9d Surface printing units 5a-5
d cylinder 10a, 10b, 10c, 10d Backside printing units 6a-6
d plate cylinders 11a, 11b, 11c, 11d impression cylinders 12a, 12b, 12c, 12d impression cylinders 13a, 13b, 13c, 13d surface printing units 5a to 5d
d inking mechanism 14a, 14b, 14c, 14d Backside printing units 6a to 6d
d inking mechanism

Claims (3)

[Claims] A blanket cylinder, a plate cylinder, and an inking mechanism are provided on an upper part of an impression cylinder provided with a paper holding claw to form a surface printing unit, and a blanket cylinder is provided below the impression cylinder provided with a paper holding claw. A double-sided sheet-fed offset printing characterized by providing a plate cylinder and an inking mechanism to form a back side printing unit, and connecting the front side printing unit and the back side printing unit by an impression cylinder constituting each printing unit. Machine. 2. A blanket cylinder, a plate cylinder and an inking mechanism are provided on an upper part of an impression cylinder provided with a paper holding claw to form a surface printing unit, and a blanket cylinder is provided below the impression cylinder provided with a paper holding claw. A printing cylinder and an inking mechanism are provided to form a back side printing unit, and a plurality of the front side printing unit and the back side printing unit are alternately connected in a horizontal direction by an impression cylinder constituting each printing unit. Double-sided printing sheet-fed offset printing press. And a blanket cylinder, said plate cylinder, and an inking mechanism are provided on an upper portion of an impression cylinder having the same diameter as the plate cylinder to form a front surface printing unit. An impression cylinder which is provided and has a blanket cylinder, a plate cylinder, and an inking mechanism provided below the impression cylinder having the same diameter as the plate cylinder to form a back printing unit, and forms the front printing unit and the back printing unit. Are connected in the horizontal direction to form one unit of the front and back printing unit, and a plurality of the one unit of the front and back printing unit are connected in the horizontal direction via two intermediate cylinders provided with paper holding claws. Features a two-sided offset printing press.