JP2001191489A - Varnish coating mechanism for perfecting press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To modify a conventional perfecting sheet-fed offset printing press into a varnish coating mechanism. SOLUTION: A surface printing unit and a back printing unit are formed by providing a blanket cylinder, a plate cylinder and an inking mechanism at the upper and the lower part of each of impression cylinders having a paper gripper. In addition, the surface and back of each of sheets are alternately printed by connecting both surface and back printing units to the impression cylinders. In the perfecting sheet-fed offset printing mechanism of the described operating function, the varnish coating mechanism for the perfecting press is characterized in that a varnish is applied to the front face and the back of the sheet and dried through each unit of an impression cylinder for a varnish coater of the surface and the back printing unit.

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 varnish coating mechanism in a two-sided printing press.

[0002]

2. Description of the Related Art A conventional double-sided printing sheet-fed offset printing press is disclosed in, for example, Japanese Patent Application Laid-Open No. 6-3360.
There is one disclosed in Japanese Patent Publication No. 03-203. In this conventional duplex printing machine, a blanket cylinder, a plate cylinder, and an inking mechanism are provided at the upper and lower portions of each impression cylinder provided with a paper holding claw, respectively, to form a front printing unit and a back printing unit. By being connected by the impression cylinders that constitute the front and back printing units, the printing is sequentially performed by each impression cylinder of the front and back printing units, so that printing is performed alternately on the front and back sides of the sheet. The effects are as follows. (A) Sheets are sequentially held 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, and are conveyed. During the transfer, the front printing unit formed by the blanket cylinder, plate cylinder, and inking mechanism provided above the impression cylinder, and the back surface formed by the blanket cylinder, plate cylinder, and inking mechanism provided below the impression cylinder The printing unit can print on both sides of a sheet. The sheet is successively held 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, and is conveyed in the horizontal direction. During the transfer, the front printing unit formed by the blanket cylinder, plate cylinder, and inking mechanism provided above the impression cylinder, and the back surface formed by the blanket cylinder, plate cylinder, and inking mechanism provided below the impression cylinder With the printing unit, a plurality of colors can be printed alternately on both sides of the sheet. C) The sheet is transferred from the paper holding claw provided on the impression cylinder of the front side printing unit to the paper holding claw provided on the impression cylinder of the back side printing unit, and is conveyed in the horizontal direction. During the transfer, the front printing unit formed by the blanket cylinder, plate cylinder, and inking mechanism provided above the impression cylinder, and the back surface formed by the blanket cylinder, plate cylinder, and inking mechanism provided below the impression cylinder One unit of the front and back printing unit including the printing unit can print one color on each of the front and back surfaces of the sheet.
D. Then, the sheet is transferred to the two intermediate cylinders by the holding claws, and then transferred to the impression cylinder of the next one unit of the front and back printing unit. Each of them can print the second color. Oh,
Hereinafter, a plurality of colors can be printed on both sides of the sheet by a similar process. In this case, printing is performed by connecting the impression cylinders of the front-side printing unit and the back-side printing unit to the plate cylinder in the horizontal direction with the same diameter as the plate cylinder, and connecting a plurality of units through two intermediate cylinders using them as one unit. The overall height can be kept low. F. 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.

Further, a specific double-sided printing sheet-fed offset printing press according to the conventional system will be described with reference to FIG. FIG. 3 shows a two-sided, four-color, sheet-fed offset printing press. Sheets P piled in a feeder main body 1 are printed by a printing unit via a feeder boat 2, a swing device 3, and a transfer cylinder 4. B, and is printed on the front and back sides of the sheet P for each of the four colors.

[0004] This two-sided, four-color printing sheet-fed offset printing press includes:
Front surface printing units 5a, 5b, 5c, 5d formed respectively
And the back printing units 6a, 6b, 6c, and 6d, the first color front printing unit 5a, the first color back printing unit 6a, and then the second color front printing unit 5
It is connected alternately as b. In that case,
The impression cylinders 11a to 11d and 12a to 12d constituting each of the printing units 5a to 5d and 6a to 6d on the front and back sides are connected in a horizontal direction, and the impression cylinder axes are connected substantially linearly as shown in FIG. It is composed. However, each of the impression cylinders 11a to 11d, 12 is formed so that a line segment connecting the axis of the impression cylinder becomes zigzag.
a to 12d may be connected. Reference numeral 17 denotes an ink drying device provided near each of the impression cylinders 11a to 11d and 12a to 12d.

[0005] With such a configuration, the sheet P is delivered 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. Thereafter, the second to fourth front side printing units 5b to 5d and the second to fourth back side printing units 6a to 6d alternately print the second to fourth colors on the front and back surfaces of the sheet P in the same manner as described above. Will be applied.

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

[0007]

By improving such a conventional double-sided printing machine, the front-side printing unit and the back-side printing unit can be coated and dried with varnish on the front and back sides through one varnish coater cylinder. However, there is a problem to be solved by the present invention.

[0008]

SUMMARY OF THE INVENTION The present invention has been developed in order to solve the above-mentioned problems. A blanket cylinder, a plate cylinder, and an inking mechanism are provided above and below each of the impression cylinders having paper holding claws. A double-sided printing sheet-fed offset printing mechanism that forms a front side printing unit and a back side printing unit, connects the front and back side printing unit to an impression cylinder, and prints alternately on the front and back sides of a sheet. The present invention provides a varnish coating mechanism in a double-sided printing machine characterized in that varnish coating on the front and back surfaces is performed on a back printing unit through a varnish coater for each varnish coater. A front varnish coater device and a front surface drying device are disposed on a varnish coater impression cylinder, and a back varnish coater device and a back surface drying device are provided on the back surface varnish coater impression cylinder. In the varnish coating mechanism according to the preceding paragraph, the varnish coating mechanism is arranged so as to be a front varnish coater and a drying unit and a rear varnish coater and a drying unit, and the arrangement is reversed. In the coating mechanism, the impression cylinder for the varnish coater has a diameter twice to four times the diameter of the plate cylinder and the blanket cylinder. The drying device uses an infrared (IR) system, an ultraviolet (UV) system, or other various systems. In the varnish coating mechanism described in the preceding paragraph, the printing cylinder diameter of the printing unit is set to the plate cylinder and blanket cylinder diameter. Of the same diameter and via an intermediate cylinder, or The present invention provides a varnish coating mechanism in a double-sided printing machine in which the diameter is doubled as a plate cylinder and a blanket cylinder and does not pass through an intermediate cylinder. It is to provide a varnish coating mechanism in a printing press.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention, a blanket cylinder, a plate cylinder, and an inking mechanism are provided above and below each impression cylinder having a paper holding claw to form a front printing unit and a back printing unit. In a double-sided printing sheet-fed offset printing mechanism that alternately prints on the front and back sides of a sheet by connecting the front and back printing units to the impression cylinder, the front side printing unit and the back side printing unit are each connected via one varnish coater impression cylinder. Since this is a varnish coating mechanism in a double-sided printing machine characterized in that varnish coating and drying are performed on the front and back surfaces, a print finish that cannot be obtained by a conventional method in which an ink drying device is simply provided is obtained.

Further, according to an embodiment of the present invention, in the varnish coating mechanism, a surface varnish coater device and a front surface drying device are provided on the impression cylinder for the front surface varnish coater, while the rear surface varnish coater device and the back surface drying device are provided on the pressure drum for the back surface varnish coater. And the varnish coater and the drying unit are arranged so as to be the front varnish coater and the drying unit and the back varnish coater and the drying unit, and the arrangement is reversed. The position of the unit can be freely changed, and even if it is changed, the same effect can be obtained.

In the embodiment of the present invention, the varnish coater and the drying device can be installed by setting the impression cylinder for the varnish coater in the varnish coating mechanism to have a diameter twice to four times as large as the plate cylinder and the blanket cylinder. be able to. In the embodiment of the present invention, the varnish coating mechanism uses a blanket coater method, a chamber method, or other various methods for the varnish coater device, and uses an infrared (IR) method or an ultraviolet (U) method for the drying device.
V) or other various methods can be used, so that it can be installed in any type of duplex printer.

Further, according to an embodiment of the present invention, in the varnish coating mechanism described in the preceding paragraph, the diameter of the impression cylinder of the printing unit is made equal to the diameter of the plate cylinder and the blanket cylinder and the intermediate cylinder is interposed, or the diameter of the impression cylinder and the impression cylinder is reduced. By making the diameter of the blanket cylinder double and not passing through the intermediate cylinder,
It can be installed in any body arrangement. Further, in the embodiment of the present invention, since the varnish coating mechanism uses a dedicated machine for a double-sided varnish coater without printing, the varnish coating mechanism can be frequently used for a wide range of models.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. The double-sided printing press of the present invention is a double-sided printing sheet-fed offset printing press developed by the present applicant and disclosed in Japanese Patent Application Laid-Open No. 6-336003. Therefore, only the main part of the present invention will be described in detail here.

First, as shown in FIG. 1, a two-sided printing press according to the present invention is a conventional two-sided printing sheet-feeding apparatus in which a front side printing unit and a back side printing unit are disposed between a paper feeding unit and a paper discharging unit. A front side varnish coater and a drying unit, and a back side varnish coater and a drying unit are installed between the paper discharge unit of the offset printing machine and the front and back side printing units. Next, the main part of the varnish coating mechanism according to the present invention will be described with reference to FIG. 2. A varnish coater impression cylinder having a diameter of 2 to 4 times the plate cylinder and blanket cylinder is provided, and a surface varnish coater impression cylinder W1 is provided. A surface varnish coater is provided via the plate cylinder, and a surface drying device is additionally provided. On the other hand, a back varnish coater device is also provided on the impression varnish W2 for the back varnish coater similarly to the front varnish coater device W1, and a back surface drying device B2 is additionally provided.

[0015] With this configuration, the sheet printed by the front-surface printing unit can be used as the impression cylinder W for the front-side varnish coater.
The varnish supplied from the surface varnish coater A1 sent to 1 is attached to the surface varnish coater impression cylinder via the plate cylinder, and the surface of the printing paper is further dried via the surface drying apparatus A2. On the other hand, the sheet printed by the back side printing unit is printed on the printing paper sent from the front side varnish coater impression cylinder W1 via the back side varnish coater apparatus B1 and the back side drying apparatus B2 in the back side varnish coater impression cylinder W2. The backside of the machine is varnished and dried.

That is, in the varnish coating mechanism of the present invention, the varnish coater device for the front and back surfaces and the drying device are provided on the impression cylinders for the front varnish coater and the back varnish coater, respectively. It is characterized in that the varnish coating and drying can be performed.

[0017]

According to the varnish coating mechanism of the present invention, a blanket cylinder, a plate cylinder and an inking mechanism are provided above and below each impression cylinder having a paper holding claw to form a front printing unit and a back printing unit. In a double-sided printing sheet-fed offset printing mechanism in which a back side printing unit is connected to an impression cylinder to alternately print on the front and back sides of a sheet, the front side printing unit and the back side printing unit are each connected via one varnish coater impression cylinder. A varnish coating mechanism in a double-sided printing machine characterized by performing varnish coating and drying of the front and back surfaces,
Further, in the varnish coating mechanism, a surface varnish coater device and a surface drying device are disposed on a pressure drum for a surface varnish coater, and a rear surface varnish coater device and a back surface drying device are disposed on a pressure drum for a back varnish coater; In the varnish coating mechanism, a front varnish coater and a drying unit and a back varnish coater and a drying unit are used, and the impression cylinder for the varnish coater has a diameter twice to four times as large as a plate cylinder and a blanket cylinder. Alternatively, a chamber system or other various systems are used, and an infrared (IR) system or an ultraviolet (UV) system or other various systems are used for the drying device. The same diameter and through the intermediate cylinder, And with a configuration in which without using the multiplication using merge in diameter transfer cylinder of the blanket cylinder, because those with print without duplex varnish coater dedicated machine has many advantages, such as:. A. In a conventional two-sided printing machine,
It is possible to completely and surely prevent the varnish viscosity and printing trouble of the original coating, which occur when varnish coating is performed after double-sided printing or when varnish is applied to the back surface in a state where the varnish applied on the front surface is not dried. (1) Since varnish coating (application) and drying can be performed in a continuous process using a single impression cylinder (cylinder) for a varnish coater, the operability can be enhanced. (C) By setting the impression cylinder for the varnish coater from a double diameter to a quadruple diameter of the plate cylinder and the blanket cylinder, the varnish coater device and the drying device can be installed, so that there is no problem in terms of arrangement.

Further, since the present invention is an improvement on the conventional double-sided printing sheet-fed offset printing press, the following effects which have been conventionally obtained are naturally obtained. A) A blanket cylinder, plate cylinder, and inking mechanism are provided above the impression cylinder provided with paper holding claws to form a surface printing unit, and blanket cylinders, plate cylinders, and ink are provided below the impression cylinder provided with paper holding claws. A king mechanism is provided to form a back side printing unit, and the front side printing unit and the back side printing unit are connected alternately in the horizontal direction by a plurality of impression cylinders constituting each printing unit. It is particularly effective for designing a sheet that can be made small and has a large sheet size.
(A) a paper holding claw is provided, and a blanket cylinder, a plate cylinder, and an inking mechanism are provided on an upper part of an impression cylinder having the same diameter as the plate cylinder to form a surface printing unit, and a paper holding claw is provided; A blanket cylinder, a plate cylinder, and an inking mechanism are provided below the impression cylinder having the same diameter as that of the impression cylinder to form a back side printing unit, and the impression cylinders forming the front side printing unit and the back side printing unit are horizontally connected to each other. A single unit of front and back printing unit is configured, and one unit of front and back printing unit is connected in a horizontal direction via two intermediate cylinders provided with paper holding claws. Can be lowered. Then, 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 an overall schematic diagram showing a varnish coating mechanism in a two-sided printing machine of the present invention.

FIG. 2 is a partially enlarged explanatory view showing a main part of the present invention shown in FIG. 1;

FIG. 3 is an overall schematic diagram showing a conventional double-sided printing sheet-fed offset printing press.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Feeder main body 2 Feeder board 3 Swing device 4 Transfer cylinder 5a-5d Front printing unit 6a-6d Back printing unit 7a-7d Blanket cylinder 8a-8d Blanket cylinder 9a-9d Plate cylinder 10a-10d
Plate cylinder 11a-11d Impression cylinder 12a-12d
Impression cylinder 13a-13d inking mechanism 14a-14d
Inking mechanism 15a-15d Water supply mechanism 16a-16d
Water supply mechanism 20 Delivery cylinder 21 Sprocket 22 Delivery chain with gripper 23 Discharge table B Printing paper P Sheet paper

Claims (7)

[Claims] 1. A front printing unit and a back printing unit are formed by providing a blanket cylinder, a plate cylinder, and an inking mechanism above and below each impression cylinder having a paper holding claw. In a double-sided printing sheet-fed offset printing mechanism that alternately prints on the front and back sides of a sheet by connecting, the front side printing unit and the back side printing unit are coated with varnish on the front and back sides and dried by one varnish coater impression cylinder. And a varnish coating mechanism in a double-sided printing machine. 2. The varnish coating mechanism according to claim 1, wherein
2. The double-sided printing press according to claim 1, wherein the surface varnish coater device and the surface drying device are provided on the impression cylinder for the surface varnish coater, and the back surface varnish coater device and the back surface drying device are provided on the impression cylinder for the back surface varnish coater. Varnish coating mechanism. 3. The varnish coating mechanism according to claim 1, wherein
3. The varnish coating mechanism in a double-sided printing machine according to claim 1, wherein the varnish coater and the drying unit are arranged so as to be a back varnish coater and a drying unit, and the arrangement is reversed. 4. The varnish coating mechanism according to the preceding claim,
2. The varnish coating mechanism in a double-sided printing machine according to claim 1, wherein the impression cylinder for the varnish coater has a diameter twice to four times the diameter of the plate cylinder and the blanket cylinder. 5. The varnish coating mechanism according to the preceding claim,
5. A method according to claim 1, wherein the varnish coater uses a blanket coater, a chamber, or various other methods, and the drying apparatus uses an infrared (IR) method, an ultraviolet (UV) method, or other various methods.
A varnish coating mechanism in the double-sided printing press described in the above. 6. The varnish coating mechanism according to the preceding claim,
The diameter of the impression cylinder of the printing unit is the same as the diameter of the plate cylinder and the blanket cylinder and the intermediate cylinder is interposed, or the diameter of the impression cylinder is double the diameter of the plate cylinder and the blanket cylinder and the intermediate cylinder is not interposed. Item 6. A varnish coating mechanism in a double-sided printing press according to items 1, 4 and 5. 7. The varnish coating mechanism according to the preceding claim,
Claim 1, wherein a printing-only double-sided varnish coater is used.
7. A varnish coating mechanism in the double-sided printing press according to 4, 5, and 6.