JP3000249B2 - Double-sided printing sheet-fed offset printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-sided printing sheet-fed offset printing press, and more particularly to a printing method capable of performing offset printing of a plurality of colors on each of the front and back surfaces of a sheet in a single pass. It is about the machine.

[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.

[0003] The above-mentioned reversal type double-sided printing system includes a back side printing unit / front side printing unit, a paper reversing unit, and the like. 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. Plate cylinder, ink mechanism,
A dampening mechanism and the like are provided, respectively, to constitute a printing unit, and a gripper is provided on each blanket cylinder and impression cylinder, and a plurality of colors are simultaneously printed on both sides of the sheet while the sheet is being conveyed. The configuration is disclosed in Japanese Patent Application Laid-Open No. 58-1473.
No. 64 discloses this.

[0005] 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. 5
A cylinder-type two-color printing unit is formed.
The printing units of each set are arranged alternately in the vertical direction, and the respective impression cylinders are connected so that the straight line connecting the axis of the impression cylinder becomes zigzag. Japanese Patent Publication No. Hei 3-21346 discloses a double-sided printing sheet-fed offset printing press in which a paper discharge device is connected to the uppermost impression cylinder, and four-color printing is performed in two-color units on both sides of the sheet. It is disclosed in the gazette.

[0006]

However, in the above-mentioned reversing type double-sided printing system, the rear end of the sheet conveyed by the reversing cylinder and being crushed is gripped by a gripper to change the one side. The printing speed is lower than that of a printing press, and the registration 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 staining 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.

The present invention has been proposed in view of the above, and an object of the present invention is to provide a novel double-sided sheet-fed offset printing press which simultaneously eliminates the various disadvantages described above.

[0010]

SUMMARY OF THE INVENTION The present invention has been developed to solve the above-mentioned problems, and has one blanket cylinder and one plate on the upper part of an impression cylinder provided with a paper holding claw. A surface printing unit on which a cylinder and an inking mechanism are arranged;
One blanket cylinder, one plate cylinder, and a back-side printing unit in which an inking mechanism is arranged below the other impression cylinder provided with a paper holding claw, and these two impression cylinders are arranged horizontally or obliquely. The front and back printing units are connected in a single unit to form a front and back printing unit, and a plurality of units of the front and back printing units are arranged in a horizontal direction, the impression cylinder diameter is the same as the plate cylinder and blanket cylinder diameter, and each unit is A configuration in which an intermediate cylinder is interposed between the front and back printing units or a configuration in which the diameter of the impression cylinder is made twice as large as the diameter of the plate cylinder and the blanket cylinder so that the intermediate cylinder is not interposed, and the axis of the impression cylinder or the cylinder of the impression cylinder and the intermediate cylinder An object of the present invention is to provide a double-sided printing sheet-fed offset printing press characterized by alternately printing the front surface and the back surface of a printing paper by connecting the axes in a substantially linear or zigzag shape.

[0011]

According to the above construction, the sheet is sequentially held by the paper holding claw provided on the impression cylinder of the front side printing unit and the paper holding claw provided on the impression cylinder of the back side printing unit, and is conveyed in the horizontal direction. You. During the conveyance, the surface printing unit formed by the blanket cylinder, plate cylinder, and inking mechanism provided at the upper part of the impression cylinder, and the surface printing unit formed by the blanket cylinder, plate cylinder, and inking mechanism provided at the lower part of the impression cylinder The back side printing unit can print a plurality of colors alternately on both sides of the sheet.

Further, the sheet is transferred from the paper gripper provided on the impression cylinder of the front side printing unit to the paper gripper provided on the impression cylinder of the back side printing unit, and is conveyed in the horizontal direction. During the transfer, the surface printing unit formed by the blanket cylinder, plate cylinder, and inking mechanism provided at the upper part of the impression cylinder, and the surface printing unit formed by the blanket cylinder, plate cylinder, and 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. Then, after the sheet is delivered to the two intermediate cylinders by the holding claws,
It is delivered to the impression cylinder of the next unit of front and back printing units.
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 / other operation spaces can be formed between the plurality of front side printing units and between the plurality of back side printing units.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic side view of a single-sided, four-color sheet-fed offset printing press according to a first embodiment of the present invention, in which a sheet P piled on a feeder main body 1 includes a feeder board 2 and a swing device 3. The sheet P is fed to the printing unit B via the transfer drum 4 and printed on each of the front and back sides of the sheet P in four colors.

The printing section B includes four front side printing units 5a to 5d and four back side printing units 6a to 6d. The first color surface printing unit 5a is provided with a blanket cylinder 7a, a plate cylinder 9a, and a paper holding claw (not shown), and an impression cylinder having a diameter twice as large as that of the plate cylinder 9a.
11a, an inking mechanism 13a, a water supply mechanism 15a, etc.,
On the upper part of the impression cylinder 11a, a blanket cylinder 7a, a plate cylinder 9a,
It is formed by connecting the inking mechanism 13a and the water supply mechanism 15a. Surface printing units 5b to 5 for the second to fourth colors
The same applies to d.

The back printing unit 6a for the first color is provided with a blanket cylinder 8a, a plate cylinder 10a, and a paper holding claw (not shown), similarly to the front printing unit 5a. Is composed of an impression cylinder 12a, an inking mechanism 14a, a water supply mechanism 16a and the like having a diameter twice as large as the above, but a blanket cylinder 8a, a plate cylinder 10a, an inking mechanism 14a, and a water supply mechanism 16a are connected to the lower part of the impression cylinder 12a. It is formed as follows. The same applies to the back printing units 6b to 6d for the second to fourth colors.

The first embodiment of the present invention is a two-sided four-color printing sheet-fed offset printing press having front-side printing units 5a, 5b, 5c, and 5d and back-side printing units 6a, 6b, 6c, and 6d formed as described above. For example, after the first color front side printing unit 5a, the first color back side printing unit 6
a are alternately connected next to the second color front side printing unit 5b. In that case, the impression cylinders forming the printing units 5a to 5d and 6a to 6d on the front and back sides
11a to 11d and 12a to 12d are connected in a horizontal direction.
As shown in the figure, the impression cylinder axis is connected in a substantially straight line. 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 the above arrangement, 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. And the first color printing is performed on the back surface of the impression cylinder 12a. Then, as described above, the second to fourth
The 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 impression cylinder 12d, reference numeral 21 denotes a sprocket, and reference numeral 22 denotes a delivery chain with grippers driven by the sprocket 21. The paper is discharged onto a paper discharge table 23 by a chain 22 with a gripper through the.

In this embodiment, the impression cylinders 11a to 11d of the front side printing units 5a to 5d and the back side printing unit 6
Although the impression cylinders 12a to 12d having the diameters twice as large as those of the plate cylinders 9a and 10a have been described.
An impression cylinder having the same diameter as a.10a may be used. Also, the front side printing unit 5 is provided behind the back side printing unit 6a.
a may be connected.

FIG. 2 shows a second embodiment and is a schematic side view of a two-color two-color printing sheet-fed offset printing press. In this case, the printing unit C is replaced with the first and second front side printing units 5a and 5b and the first and second back side printing units 6 of the first embodiment.
The printing units 11a, 11b, 12a, and 12b forming the printing unit are connected in the horizontal direction using the same units as those of the printing units a and 6b. Since the configuration of other parts is the same as that of the first embodiment, the same reference numerals are given to the drawings and detailed description is omitted.

FIG. 3 shows a third embodiment and is a schematic side view of a single-sided, four-color printing sheet-fed offset printing press. In this case, the printing unit D is replaced with the four front printing units 5a to 5d and the four back printing units 6a to 6d of the first embodiment.
The same backing printing unit 6 for the first color
The printing unit 5a for each of the front and back surfaces 5a to 5d and 6a to 6d are alternately connected, such as a front printing unit 5a for the first color, a back printing unit 6b for the second color, and a back printing unit 6b for the second color. , The impression cylinders 11a to form the printing unit
11d, 12a to 12d are connected in the horizontal direction. With this configuration, the sheet P is placed on the feeder board 2.
Even if the transfer cylinder 4 is not provided, the swing unit 3 directly transfers the print cylinder 12a of the first backside printing unit 6a to perform printing of the first color on the backside, and then performs the printing of the first side printing unit 5a. 11a, the first color printing is performed on the surface. Thereafter, printing of the second to fourth colors is performed on both sides of the sheet P alternately in the same manner as described above. Since the impression cylinder 11d is connected to 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 22 with the gripper without the delivery cylinder 20, and The paper is discharged onto 23. The configuration of the other parts is the first
Since this embodiment is the same as the embodiment, the same reference numerals are given to the drawings and the detailed description is omitted. 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.

FIG. 4 shows a fourth embodiment, and is a schematic side view of a two-sided two-color printing sheet-fed offset printing press. In this case, the printing unit E is connected to the first and second back side printing units 6a and 6b and the first and second front side printing units 5 of the third embodiment.
The printing units 11a, 11b, 12a, and 12b forming the printing unit are connected in the horizontal direction using the same units as those of the printing units a and 5b. The other parts of the configuration are the same as those of the third embodiment.

As shown in FIGS. 1, 2, 3, and 4, a space 18 provided between the back side printing units 6a to 6d is provided.
The configuration is such that maintenance and other operations can be performed on the back side printing units 6a to 6d at a to 18d.

FIG. 5 shows a fifth embodiment of the present invention. FIG. 5 is a schematic side view of a single-sided, four-color sheet-fed offset printing press.
The sheet P is fed to the printing unit via the swing unit 3 and the transfer cylinder 4, and is printed on each of the front and back surfaces of the sheet P in four colors.

Hereinafter, the first color front side printing unit 5a and the back side 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 includes 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, and a blanket cylinder 7a, a plate cylinder 9a, and the like are provided above the impression cylinder 11a. It is formed by connecting the inking 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 front side printing unit 5a.
Impression cylinder 12a having the same diameter as 10a, inking mechanism 14a, water supply mechanism
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 printing unit 6a is connected horizontally to the rear side of the impression cylinder 11a of the front printing unit 5a to form a first color front / back printing unit G as one unit. Second color to fourth color front and back printing unit H
J has the same configuration as that of the first color front and back printing unit G described above, and thus a detailed description is omitted.

In the fifth embodiment of the present invention, the two-sided four-color printing sheet-fed offset printing press has the first
The color-grain / fourth-color front / back printing units G to J are connected in the horizontal direction by two intermediate cylinders 17 and 18 provided between the units. 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.
The first to fourth color front and back printing units G to J are connected such that the shaft axes of d, 12a to 12d, and the six intermediate cylinders 17 and 18 are substantially linear. However, the first color to the fourth color are so arranged that the line segment connecting the trunk axis becomes zigzag.
In some cases, the color printing units G to J are connected.

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

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

FIG. 6 shows a sixth 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 GH of the fifth embodiment to form the impression cylinders 11a, 12a, and 11b.
-It is configured by connecting the 12b and the intermediate cylinders 17 and 18 in the horizontal direction. As a result, the sheet P becomes the impression cylinders 11a and 12a,
Since the two intermediate cylinders 17 and 18 and the impression cylinders 11b and 12b are sequentially delivered, two-color printing can be performed on both sides of the sheet P. The configuration of the other parts is the same as that of the above-described fifth embodiment.

FIG. 7 shows the seventh embodiment and is a schematic side view of a single-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 fifth 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 an intermediate cylinder 17, 18 provided between each of the units G1 to J1.
In the horizontal direction. Thus, the sheet P is transferred from the transfer cylinder 4 to the impression cylinder 12a of the back printing unit 6a constituting the first color front and back printing unit G1, and the first color is printed on the back surface, and then the front surface is printed. It is delivered to the impression cylinder 11a of the printing unit 5a, and the first color is printed on the surface thereof. After that, the sheet P
The sheets are sequentially sent to the second, third, and fourth color front and back printing units H1, I1, and J1 via the two intermediate cylinders 17 and 18, and the second to fourth color printings are respectively printed on the front and back surfaces. Will be applied. Impression cylinder
Since 11d is connected to the delivery chain 22 with the gripper, 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 placed on the delivery tray 23. Is discharged to The configuration of the other parts is the fifth
Since this embodiment is the same as the embodiment, the same reference numerals are given to the drawings and the detailed description is omitted. 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.

FIG. 8 shows the eighth 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 seventh embodiment to form the impression cylinders 12a and 11a.
12b and 11b and intermediate cylinders 17 and 18 are connected in the horizontal direction. As a result, the sheet P is transferred to the impression cylinders 12a and 11
a, the two intermediate cylinders 17 and 18 and the impression cylinders 12b and 11b are sequentially delivered, and two-color printing can be performed on both sides of the sheet P. The configuration of the other parts is the same as that of the above-described seventh embodiment. When the upper swing is used, the transfer drum 4 can be omitted.

As shown in FIGS. 5, 6, 7, and 8, 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 the front and back side printing units G, G1, and a plurality of similarly structured front and back side printing units H, H1, I, I1, J, J1 are respectively intermediate two units. Since they are connected via the cylinders 17 and 18, a plurality of printing units 5a to 5d and a back printing unit 6a
A space for maintenance and other operations is formed between 6 and 6d.

[0035]

According to the present invention, there is provided a double-sided printing sheet-fed offset printing press comprising a surface printing unit having one blanket cylinder, one plate cylinder, and an inking mechanism disposed above an impression cylinder provided with a paper holding claw. , One below the other impression cylinder with paper grippers
A blanket cylinder, a back printing unit having a plate cylinder and an inking mechanism, and connecting these two impression cylinders horizontally or diagonally to form a front and back printing unit. A plurality of units of the front and back printing units are arranged in the horizontal direction, the diameter of the impression cylinder is made equal to the diameter of the plate cylinder and the blanket cylinder, and an intermediate cylinder is interposed between each one unit of the front and back printing units. The diameter is double the diameter of the plate cylinder and blanket cylinder, and the intermediate cylinder is not interposed.The axis of the impression cylinder, or the axis of the impression cylinder and the intermediate cylinder are connected in a substantially linear or zigzag manner. Since the front and back sides of a plurality of colors are printed by alternately printing the front and back sides of the printing paper, there are many effects as follows. A, by the impression cylinder of each printing unit on the front and back,
Since the printed paper is delivered, printing can be performed on the front and back surfaces of the sheet, so that the curl of the sheet can be extremely reduced. Further, all the disadvantages of the reversing type, BB type, and other types of double-sided printing machines can be eliminated.

In addition, since the overall height of the printing press can be made relatively small, it is particularly effective for designing a large-sized sheet.

Furthermore, 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 secured 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 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.

[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-6
d inking mechanism

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-52-86801 (JP, A) JP-A-58-147364 (JP, A) JP-A-63-87234 (JP, A) JP-A-58-87234 118254 (JP, A) Japanese Utility Model Showa 62-121930 (JP, U) Japanese Utility Model Showa 62-102532 (JP, U) Japanese Utility Model Utility Model 1-166532 (JP, U) Japanese Patent Publication 3-21346 (JP, B2) US Patent 1282642 (US, A) US Patent 511095 (US, A) US Patent 2888551 (US, A) UK Patent 26911 (GB, B) German Patent 233984 (DE, C2)

Claims (1)

(57) [Claims] 1. A blanket cylinder , a plate cylinder, and an inking mechanism are arranged on an upper part of an impression cylinder provided with a paper holding claw.
A front surface printing unit and, to constitute a back printing unit arranged one blanket cylinder and one plate cylinder and inking mechanism at the bottom of the other impression cylinder provided with a paper gripper, this
Connect these two impression cylinders horizontally or diagonally to
The front and back printing unit is used as a unit.
Multiple units of the knit are arranged in the horizontal direction ,
A table of the same size as the plate cylinder and blanket cylinder diameter and one unit for each
A configuration in which an intermediate cylinder is interposed between backside printing units or an impression cylinder
Make the diameter twice as large as the plate cylinder and blanket cylinder and pass through the intermediate cylinder.
And the impression cylinder's shaft center, or the impression cylinder and the intermediate cylinder
A double-sided printing sheet-fed offset printing machine characterized in that the cylinder axis of the printing paper is connected in a substantially straight line or zigzag shape, and the front and back surfaces of the printing paper are alternately printed.