JP3709249B2 - Seasoning mechanism in sheet-fed offset printing press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet-fed offset printing machine, and more specifically, a sheet-fed offset formed by attaching a humidity control unit composed of a seasoning unit to a printing unit of a single-color printing, multi-color printing, single-sided printing, or double-sided printing. The present invention relates to a seasoning mechanism in a printing press.
[0002]
[Prior art]
Traditionally, humidity conditioning (conditioning) of printing paper is based on the “natural humidity control method”, which is called hanging drying, and the forced temperature and humidity of the paper is blown onto the paper by force. The “forced humidity control method” (seasoning machine) that changes the paper, the “paper waste removal method” that forces the paper wrinkles to eliminate unevenness in the paper humidity regardless of the humidity in the printing room, and an infrared lamp or heater on the press There are four types of methods: “heating drying method” (other paper removal method) using radiant heat attached to the feeder section. Since these methods are seasoning before printing, if left as they are, the state of the paper changes and a lot of 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.
[0003]
In the conventional sheet-fed offset printing machine (double-sided printing) shown in FIG. 4, the sheet P piled on the feeder body 31 is fed to the printing unit via the feeder board 32, the swing device 33 and the transfer cylinder 34. The four colors are printed on both front and back sides of the sheet P. The printing unit includes four front surface printing units 35 and four back surface printing units 36. In addition, the double-sided four-color sheet-fed offset printing machine includes a front surface printing unit 35 and a back surface printing unit 36 that are respectively formed, for example, the first color back surface printing unit 35 next to the first color front surface printing unit 35, Next, the second color surface printing unit 35 is connected alternately. In this case, the impression cylinders 41 and 42 constituting the printing units 35 and 36 on the front and back surfaces are connected in the horizontal direction, and the impression cylinder axes are connected 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 has a zigzag shape. Reference numeral 47 denotes an ink drying device provided in the vicinity of each of the impression cylinders 41 and 42 described above.
[0004]
With such a configuration, the sheet P is transferred from the transfer cylinder 34 to the impression cylinder 41 of the first front surface printing unit 35 and printed on the surface thereof with the first color, and then the pressure of the first back surface printing unit 36 is applied. It is delivered to the cylinder 42 and the first color is printed on its back surface. Thereafter, in the same manner as described above, the second to fourth front surface printing units 35 and the second to fourth rear surface printing units 36 alternately print the second to fourth colors on the front and back surfaces of the sheet P. Reference numeral 50 is a delivery cylinder connected to the last impression cylinder 42, 51 is a sprocket, 52 is a delivery chain with a gripper driven by the sprocket 51, and the sheet P after printing is transferred from the impression cylinder 42 to the delivery cylinder 50. Then, the paper is discharged onto a paper discharge tray 53 by a chain 52 with a gripper.
[0005]
[Problems to be solved by the invention]
In such a conventional sheet-fed offset printing press, there is a problem to be solved by the present invention in which a seasoning mechanism is directly attached to a printing unit of a printing press that does not have a seasoning mechanism in a printing unit.
[0006]
[Means for Solving the Problems]
The present invention has been developed to solve the above-described problems, and is a one-color printing or multi-color printing or single-sided printing or double-sided sheet-fed offset printing press composed of a paper feed unit, a printing unit, and a paper discharge unit. Therefore, in order to adjust the printing paper fed from the paper feeding unit to be easy to print by removing excessively dry and too wet printing, the printing paper is adjusted by applying appropriate humidity and pressure immediately before printing. A humidity control unit for moistening is provided in front of the printing unit, and the humidity control unit includes a humidity supply device, a blanket and an impression cylinder supplied from the humidity supply device, and a swing device. A transfer drum for feeding printing paper fed from the paper feed unit, and the humidity control unit is arranged so that the pressure drum of the humidity control unit is connected to the pressure drum of the printing unit And a humidifier is used instead of the humidifier of the humidity control unit. To.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
First, in an embodiment of the present invention, in a sheet-fed offset printing press composed of a paper feed unit, a printing unit, and a paper discharge unit, adjustment is made so that printing is easy by removing excessively wet or too wet printing paper. Since it is a seasoning mechanism in a sheet-fed offset press that pressurizes and adjusts the humidity level of the printing paper just before printing, it applies moderate humidity and pressure to the printing paper just before printing. be able to.
[0008]
An embodiment of the present invention is a one-color printing or multi-color printing or single-sided printing or double-sided sheet-fed offset printing machine including a paper feeding unit, a printing unit, and a paper discharging unit, and includes a seasoning unit in the printing unit. Since this is a seasoning mechanism in a sheet-fed offset printing press provided with a humidity control unit, seasoning can be performed even in a printing unit that has been impossible in the past.
[0009]
According to an embodiment of the present invention, the humidity control unit supplies a humidity supply device, a blanket and an impression cylinder supplied with moisture from the humidity supply device, and a printing paper supplied from the paper supply unit via a swing device. Because it is composed of a transfer drum, it is a simple seasoning unit.
[0010]
Furthermore, since the embodiment of the present invention is configured by using a humidifier instead of the humidifier of the humidity control unit, a seasoning unit having a wide application range can be provided.
[0011]
【Example】
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 machine of the present invention in a double-sided four-color sheet-fed offset printing machine. This double-sided four-color sheet-fed offset printing machine is basically the same as the printing machine shown in FIG. 4 and is composed of a paper feeding unit A, a printing unit B, and a paper discharging unit C. Is a humidity control section S according to the present invention provided between the paper feeding section A and the printing section B. That is, in the conventional double-sided four-color printing sheet offset printing machine, the sheet P piled on the feeder body 7 is fed to the printing unit B via the feeder board 5, the swing device 6, and the transfer cylinder 4, Four colors are printed on both the front and back sides of the sheet P. The printing part B is composed of four back surface printing units 9. In addition, this double-sided four-color sheet-fed offset printing machine includes a front surface printing unit 8 and a back surface printing unit 9 that are respectively formed, for example, the first color back surface printing unit 8 next to the first color back surface printing unit 9, Next, the second color surface printing unit 8 is connected alternately. In this case, the impression cylinders 16 constituting the printing units 8 and 9 on the front and back surfaces are connected in the horizontal direction, and the impression cylinder axes are connected in a substantially straight line. However, the impression cylinders 16 may be connected so that the line connecting the impression cylinder axes has a zigzag shape.
[0012]
With such a configuration, the sheet P is transferred from the transfer cylinder 4 to the impression cylinder 16 of the first front surface printing unit 8, the first color is printed on the surface, and then the impression cylinder of the first back surface printing unit 9. 16 and the first color is printed on the back side. Thereafter, similarly to the above, the second to fourth front surface printing units 8 and the second to fourth rear surface printing pressure units 9 alternately print the second to fourth colors on the front and back surfaces of the sheet P. Reference numeral 19 is a delivery cylinder connected to the last impression cylinder 16, 21 is a sprocket, 22 is a delivery chain with a gripper driven by the sprocket 21, and the sheet P after printing is transferred from the impression cylinder 16 to the delivery cylinder. The sheet is discharged onto a sheet discharge table by a chain 22 with a gripper via 19.
[0013]
The humidity control section S composed of a seasoning unit is provided between the paper feeding section A and the printing section B of the conventional double-sided four-color sheet-fed offset printing press configured as described above. There are features.
[0014]
The humidity control unit S configured by the seasoning unit of the present invention includes a humidifier 1, a blanket cylinder 2, an impression cylinder 3, a transfer cylinder 4, a feeder board 5, and a swing apparatus 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 humidifier 1 is connected to the blanket cylinder 2. A swing device 6 is connected to one transfer cylinder 4. In this embodiment, the case of double-sided four-color printing is described. However, the present invention is not limited to this, and the same effect can be obtained by single-sided printing or single-color printing.
[0015]
2 and 3 show the seasoning required for printing. FIG. 2 shows the speed of paper absorption and dehumidification, and FIG. 3 is based on the dimensions of SP paper with a relative humidity of 50%. The humidity change and the expansion / contraction rate are shown. First, as shown in FIG. 2, the humidification of the paper is quicker than the dehumidification, and there is a difference of nearly twice under the same conditions, and the humidification is easier than the dehumidification. Further, in general, paper has a lower elongation when it is dehumidified and equilibrated than when it is absorbed and equilibrated. Therefore, the dimensional change that occurs during printing is greater for paper with moisture lower than the printing conditions than for paper with higher moisture. This shows that the humidification of the paper is higher than the necessity of dehumidification. Further, the elongation rate when the paper is moisture-absorbed from the equilibrium state and the shrinkage rate when the paper is dehumidified are not significantly different in absolute value as shown in FIG. This means that the humidity change after printing means that the dimensional change is affected in the same way for both high humidity and low humidity.
[0016]
【The invention's effect】
The present invention is a sheet-fed offset printing press composed of a paper feed unit, a printing unit, and a paper discharge unit. Since this is a seasoning mechanism in a sheet-fed offset printing press that pressurizes and pressurizes the paper with appropriate humidity, it can apply appropriate humidity and pressure to the print paper immediately before printing in the printing unit.
[0017]
The present invention also relates to a single-color printing, multi-color printing, single-sided printing, or double-sided printing sheet-fed offset printing press comprising a paper feed unit, a printing unit, and a paper discharge unit, wherein the printing unit comprises a seasoning unit. Since this is a seasoning mechanism in a sheet-fed offset printing press provided with a wet section, seasoning can be performed in a printing section that has been impossible in the past.
[0018]
According to the present invention, the humidity control unit supplies a humidity supply device, a blanket and an impression cylinder supplied with moisture from the humidity supply device, and a transfer cylinder for feeding printing paper fed from the paper feeding unit via a swing device. It is a simple seasoning unit.
[0019]
Furthermore, since the present invention is configured by using a humidifier instead of the humidity supply device of the humidity control unit, a seasoning unit having a wide application range can be provided.
[0020]
The present invention configured as described above can prevent elongation due to water during printing by applying appropriate humidity and pressure to the printing paper. Thus, since the present invention is an in-line system, printing can be performed immediately after humidity adjustment. As a result, it is possible to obtain a printed material with high registration accuracy and to reduce the printing space.
[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 double-sided four-color sheet-fed offset printing press.
FIG. 2 is an explanatory chart showing paper absorption and dehumidification rates during printing.
FIG. 3 is an explanatory chart showing changes in humidity and expansion / contraction rate of SP paper during printing.
FIG. 4 is an explanatory schematic diagram showing a conventional double-sided four-color sheet-fed offset printing press.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Humidifier 2 Blanket cylinder 3 Pressure cylinder 4 Transfer cylinder 5 Feeder board 6 Slang apparatus 7 Feeder body 8 Front surface printing unit 9 Back surface 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 transfer cylinder
21 Delivery cylinder
22 Delivery chain with gripper A Feeding section B Printing section C Discharging section S Humidity control section P Sheet 31 Feeder body
32 Feeder board 33 Swing device
34 Transfer cylinder 35 Surface printing unit
36 Back side 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 (2)

A sheet-fed offset printing machine for one-color printing or multi-color printing or single-sided printing or double-sided printing composed of a paper feeding unit, a printing unit, and a paper discharging unit,
In order to adjust the printing paper fed from the paper feeding unit to be easy to print by removing excessively dry or too wet printing, to adjust the humidity by applying appropriate humidity and pressure to the printing paper immediately before printing The humidity control part is attached to the preceding stage of the printing part,
The humidity control unit feeds printing paper fed from the paper feeding unit via a humidifier, a blanket and an impression cylinder humidified from the humidifier, a feeder board, and a swing device. The torso, and
A seasoning mechanism in a sheet-fed offset printing machine, wherein the humidity control section is arranged so that the pressure cylinder of the humidity control section is connected to the pressure cylinder of the printing section.   The seasoning mechanism for a sheet-fed offset printing press according to claim 1, wherein a humidifier is used in place of the humidifier of the humidity control unit.

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