JPH10119234A - Seasoning method in sheet offset press and its mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide additionally a seasoning mechanism directly to a printing part of a printing machine by a method wherein printed paper is stabilized in humidity by applying suitable humidity and pressure thereto just before printing. SOLUTION: A humidity stabilizing part S composed of a seasoning unit is additively provided between a paper feed part A of a perfecting four color sheet-fed offset rotary press and its printing part B. The humidity stabilized part S is composed of a humidifying device 1, a blanket cylinder 2, a transfer cylinder 4, a feed board 5, and a swing device 6. That is, an impression cylinder 3 is brought in continuos contact with an impression cylinder 16 of the printing part B, the blanket cylinder 2 and the transfer cylinder 4 are brought in continuous contact with the impression cylinder 3, the humidifying device 1 is further brought in continuous contact with the blanket cylinder 2, and the swing device 6 is brought in continuous contact with one side transfer cylinder 4. Further, the same effect is obtained for not only one side printing but also single color printing without being limited to the perfecting four color printing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-fed offset printing press, and more particularly, to a printing section of a single-color or multi-color or single-sided or double-sided sheet-fed offset printing machine, which is provided with a humidity control section comprising a seasoning unit. The present invention relates to a seasoning method and a mechanism for a sheet-fed offset printing press attached thereto.

[0002]

2. Description of the Related Art Conventionally, as a method for conditioning (conditioning) printing paper, there is a "natural humidity conditioning method", which is called hanging drying, or a method in which air having a controlled temperature and humidity is blown onto paper forcibly. "Forced humidity control" (seasoning machine), which changes the temperature and humidity of paper, "paper removal", which eliminates unevenness in paper humidity regardless of the humidity in the printing room, and an infrared lamp or "Heat drying method" that uses radiant heat by attaching a heater to the feeder of a printing press
(Another paper removal method). Since all of these methods are seasonings before printing,
If left as it is, the state of the paper changes and more space is required. That is, in the seasoning method in the conventional sheet-fed offset printing press, the seasoning mechanism is not directly provided in the printing unit. For example,
A conventional sheet-fed offset printing press has a structure as shown in FIG.

In a conventional sheet-fed offset printing press (double-sided printing) shown in FIG. 4, a sheet P piled in a feeder body 31 is sent to a printing section via a feeder board 32, a swing device 33 and a transfer cylinder 34. Fed, the sheet P
Are printed in four colors on both sides. The printing unit includes four front side printing units 35 and four back side printing units 36. In addition, in the two-sided four-color printing sheet-fed offset printing press, the front-side printing unit 35 and the back-side printing unit 36 formed respectively are, for example, a first printing unit.
The first-color backside printing unit 36 is connected alternately to the first-color backside printing unit 35, followed by the second-color front-side printing unit 35 next. In this case, the impression cylinders 41 and 42 constituting the printing units 35 and 36 on the front and back sides are connected in the horizontal direction, and are constituted by connecting the impression cylinder axes in a substantially straight line. However, the impression cylinders 41 and 42 may be connected so that the line segment connecting the impression cylinder axes becomes zigzag. Reference numeral 47 denotes an ink drying device provided near each of the impression cylinders 41 and 42.

[0004] With such a configuration, the sheet P is transferred from the transfer cylinder 34 to the impression cylinder 41 of the first front-side printing unit 35, and the first color printing is performed on the front side thereof. The print is transferred to the 36 impression cylinders 42, and the first color is printed on the back surface thereof. Then, as described above,
The second to fourth front-side printing units 35 and the second to fourth back-side printing units 36 alternately form the second side on the front and back sides of the sheet P.
From the fourth color. 50 is a delivery cylinder connected to the last impression cylinder 42, 51 is a sprocket,
Reference numeral 52 denotes a delivery chain with a gripper driven by a sprocket 51, and the sheet P after printing is
The paper is then discharged to a paper discharge table 53 by a gripper chain 52 via a delivery cylinder 50.

[0005]

In such a conventional sheet-fed offset printing press, a problem to be solved by the present invention is that a seasoning mechanism is directly attached to a printing section of a printing press having no seasoning mechanism in the printing section. There is.

[0006]

SUMMARY OF THE INVENTION The present invention has been developed to solve the above-mentioned problems, and is intended for use in a sheet-fed offset printing press comprising a paper feeding section, a printing section and a paper discharging section. Sheet-fed offset characterized by conditioning the printing paper by applying appropriate humidity and pressure to the printing paper immediately before printing to adjust the printing paper to make it easier to print by removing too dry or too wet paper. The present invention relates to a sheet-fed offset printing press for single-color or multicolor printing or single-sided or double-sided printing, comprising a paper feeding unit, a printing unit, and a paper discharging unit. The present invention provides a seasoning mechanism in a sheet-fed offset printing press characterized by being provided with a humidity control unit composed of a unit. A blanket and an impression cylinder supplied with moisture from a storage unit, and a transfer cylinder that supplies printing paper supplied from the paper supply unit via a swing device. Another object of the present invention is to provide a seasoning mechanism in a sheet-fed offset printing press using a humidifier.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment of the present invention is a sheet-fed offset printing press comprising a paper feeding section, a printing section, and a paper discharging section. This is a seasoning method in a sheet-fed offset printing press that adjusts the printing paper by applying appropriate humidity and pressure to the printing paper just before printing in order to make adjustments easily. Appropriate humidity and pressure can be applied.

Further, an embodiment of the present invention is a sheet-fed offset printing machine for one-color printing, multi-color printing, single-sided printing, or double-sided printing, which comprises a paper feeding unit, a printing unit, and a paper discharging unit.
Since this is a seasoning mechanism in a sheet-fed offset printing press in which a humidity control section composed of a seasoning unit is attached to the printing section, seasoning can be performed even in a printing section which has been impossible in the past.

Further, according to an embodiment of the present invention, the humidity control unit controls the humidifying device, the blanket and the impression cylinder humidified from the humidifying device, and the printing paper fed from the paper feeding unit via a swing device. It is a simple seasoning unit because it is composed of a transfer drum that feeds paper.

Further, in the embodiment of the present invention, since a humidifier is used in place of the humidifier of the humidity control section, a seasoning unit having a wide range of application can be provided.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a seasoning mechanism in a sheet-fed offset printing press of the present invention in a two-sided four-color printing sheet-fed offset printing press. This double-sided four-color printing sheet-fed offset printing press is basically the same as the printing press shown in FIG. 4 and includes a paper feed unit A, a print unit B, and a paper discharge unit C. Is that a humidity control section S according to the present invention is additionally provided between the sheet feeding section A and the printing section B. That is, in the conventional double-sided four-color sheet-fed offset printing press, the sheet P piled in the feeder body 7 is fed to the printing unit B via the feeder board 5, the swing device 6, and the transfer drum 4, The four-color printing is performed on both sides of the sheet P. The printing section B includes four back printing units 9. Further, the two-sided four-color printing sheet-fed offset printing press includes a front printing unit 8 formed respectively.
And the back side printing unit 9 are connected alternately, for example, the front side printing unit 8 of the first color, the back side printing unit 9 of the first color, and then the front side printing unit 8 of the second color. is there. In this case, the impression cylinders 16 constituting the printing units 8 and 9 on the front and back sides are connected in a horizontal direction, and are constituted by connecting the impression cylinder axes substantially linearly. However, the impression cylinders 16 may be connected so that the line connecting the impression cylinder axes becomes zigzag.

With such a configuration, the sheet P is transferred from the transfer cylinder 4 to the impression cylinder 16 of the first front-side printing unit 8 and the first color printing is performed on the front side thereof. And the first color printing is performed on the back surface thereof. After that, the second to fourth steps are performed as described above.
The front side printing unit 8 and the second to fourth back side printing pressure units 9 alternately print the second to fourth colors on the front and back sides of the sheet P. Reference numeral 19 denotes a delivery cylinder connected to the last impression cylinder 16, reference numeral 21 denotes a sprocket, reference numeral 22 denotes a delivery chain with a gripper driven by the sprocket 21, and a sheet P after printing is completed. The paper is discharged onto a paper discharge table by a chain 22 with a gripper through 19.

In the conventional double-sided four-color sheet-fed offset printing press having the above-described structure, a humidity control section S composed of a seasoning unit is provided between a sheet feeding section A and a printing section B. There are features of the present invention.

The humidity control section S comprising the seasoning unit of the present invention comprises a humidifier 1, a blanket cylinder 2, a transfer cylinder 4, a feeder board 5, and a slang device 6. That is, the impression cylinder 3 is connected to the impression cylinder 16 of the conventional printing section B, the blanket cylinder 2 and the transfer cylinder 4 are connected to the impression cylinder 3, and the blanket cylinder 2 is further connected to the humidifier 1. A slang device 6 is connected to one transfer cylinder 4. In the present embodiment, the case of two-sided four-color printing is described. However, the present invention is not limited to this, and the same effect can be obtained by one-sided printing or one-color printing.

FIGS. 2 and 3 show seasoning required for printing. FIG. 2 shows the absorption / dehumidification speed of the paper, and FIG. 3 shows that of an SP paper having a relative humidity of 50%. It shows the change in humidity and the rate of expansion and contraction based on the dimensions.
First, as shown in FIG. 2, the humidification of paper is faster than that of dehumidification, and under the same conditions, there is a difference of nearly two times, and humidification is easier than dehumidification. Further, paper generally has a lower elongation when dehumidified and equilibrated than when absorbed and equilibrated. Therefore, dimensional changes that occur during printing are greater for paper with a lower moisture content than for printing conditions than for paper with a higher moisture content. This indicates that humidifying the paper is higher than the necessity of dehumidifying. Further, the elongation rate when the paper absorbs moisture from the equilibrium state and the shrinkage rate when the paper dehumidifies do not significantly change in absolute value as shown in FIG. This means that the change in humidity after printing affects the dimensional change in both high and low humidity, so that humidity control in the printing room is important.

[0016]

According to the present invention, in a sheet-fed offset printing press comprising a paper feeding section, a printing section, and a paper discharging section, the printing paper is adjusted so as to remove excessively dry and excessively wet paper so as to facilitate printing. Since this is a seasoning method in a sheet-fed offset printing press that adjusts the humidity of the printing paper by conditioning the printing paper by applying a suitable humidity and pressure immediately before printing, the printing unit applies an appropriate humidity and pressure to the printing paper immediately before printing. Can be added.

The present invention is also a sheet-fed offset printing press for one-color printing, multi-color printing, single-sided printing or double-sided printing comprising a paper feeding unit, a printing unit and a paper discharging unit, wherein the printing unit comprises a seasoning unit. Since it is a seasoning mechanism in a sheet-fed offset printing press provided with a humidity control section, seasoning can be performed in a printing section which has been impossible in the past.

In the present invention, the humidity control section feeds a humidifier, a blanket and an impression cylinder humidified from the humidifier, and a printing paper fed from the paper feed section via a swing device. It is a very simple seasoning unit because it is composed of a transfer cylinder.

Further, since the present invention has a configuration in which a humidifier is used in place of the humidifying device of the humidity control section, a seasoning unit having a wide range of application can be provided.

According to the present invention having the above-described structure, by applying appropriate humidity and pressure to the printing paper, it is possible to prevent elongation due to water during printing. As described above, since the present invention is an in-line system, printing can be performed immediately after humidity control. As a result, it is possible to obtain a printed matter with high registration accuracy and to obtain an effect that a printing space is reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory schematic diagram in which a humidity control unit of the present invention is added to a two-sided four-color printing sheet-fed offset printing press.

FIG. 2 is an explanatory chart showing paper absorption / dehumidification rates during printing.

FIG. 3 is an explanatory chart showing a change in humidity and an expansion / contraction ratio of SP paper during printing.

FIG. 4 is an explanatory schematic diagram showing a conventional two-sided four-color printing sheet-fed offset printing press.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Humidifier 2 Blanket cylinder 3 Impression cylinder 4 Transfer cylinder 5 Feeder board 6 Slang device 7 Feeder body 8 Front printing unit 9 Back printing unit 10, 11 Inking mechanism 12, 13 Water supply mechanism 14, 15 Blanket cylinder 16 Impression cylinder 17 , 18 Plate cylinder 19 Intermediate cylinder 20 Delivery cylinder 21 Delivery cylinder 22 Delivery chain with gripper A Paper feed section B Printing section C Paper discharge section S Humidity control section P Sheet 31 Feeder body 32 Feeder board 33 Swing device 34 Transfer cylinder 35 Front printing unit 36 Back printing unit 37, 38 Blanket cylinder 39, 40 Plate cylinder 41, 42 Impression cylinder 43, 44 Inking mechanism 45, 46 Water supply mechanism 47 Ink dryer 48 Intermediate cylinder

Claims (4)

[Claims] In a sheet-fed offset printing press composed of a paper feeding unit, a printing unit, and a paper discharging unit, the printing paper is adjusted to remove excessively dry or excessively wet paper so as to facilitate printing.
A seasoning method in a sheet-fed offset printing press, wherein the printing paper is humidified (conditioned) by applying an appropriate humidity and pressure to the printing paper immediately before printing. 2. A sheet-fed offset printing press for one-color printing or multicolor printing or single-sided printing or double-sided printing comprising a paper feeding unit, a printing unit and a paper discharging unit, wherein the printing unit comprises a seasoning unit. A seasoning mechanism in a sheet-fed offset printing press, wherein a seasoning mechanism is provided with a wet portion. 3. The humidity control unit feeds a humidifier, a blanket and an impression cylinder humidified from the humidifier, and printing paper fed from the paper feed unit via a swing device. The seasoning mechanism in the sheet-fed offset printing press according to claim 2, comprising a transfer cylinder. 4. The seasoning mechanism in a sheet-fed offset printing press according to claim 3, wherein a humidifier is used in place of the humidifier of the humidity control section.