JPH11309937A - Method and apparatus for offset printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for allowing accurate printing many times without replacing a blanket in a short period of time even in large pattern formation. SOLUTION: The offset printing apparatus is to print ink patterns based on the patterns via an intaglio plate 1 having patterns formed on a plate and a blanket 6, and includes a blanket feeding roller 7 having the continuous blanket 6 wrapped therearound, a recovery roller 8 for recovering blanket after the use of printing, and a blanket roller 5 for receiving ink by putting the supplied blanket 6 in contact with the intaglio plate 1 and transferring the blanket 6 to print by moving this to a work 9. The blanket 6 after the use of printing is designed to be recovered to the recovery roller 8 passing through between the work 9 and the blanket roller 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset printing apparatus and method using a pattern-formed plate and a blanket for receiving and transferring ink on the plate.

[0002]

2. Description of the Related Art In a conventional offset printing apparatus and method using a pattern-formed plate, a step of filling the plate with ink, a step of receiving ink from the plate by a blanket, and transferring the ink from the blanket to a workpiece. The process is performed with an appropriate time lag using an apparatus corresponding to the pattern.

[0003]

However, such an apparatus and method have the following problems, especially when the pattern is long.

(1) The required time becomes long due to the work of moving and replacing the plate and the work.

(2) Since the entire pattern is received on the blanket, the diameter of the blanket roll becomes large, resulting in deterioration of workability and printing accuracy (a slight deviation of the angle greatly affects the circumference). In a printing method generally called gravure printing, a pattern-formed plate is used by attaching it to a cylindrical surface, and it is not necessary to receive all patterns in this way to transfer to a work while receiving ink,
On the other hand, to bend and use a pattern created with a flat plate,
It is difficult to increase the pattern precision, and therefore, in precision printing, it is used as a flat plate.

(3) Since the blanket absorbs the ink solvent and swells, if printing is continued, the solvent absorption capacity changes, and printing stability deteriorates. There are several ways to deal with the swelling of the blanket, such as extracting the solvent absorbed by the blanket by heating or contacting a solvent absorbing material on the device, or using a long blanket for one printing. A belt supply method that supplies only a small amount and recovers it after use is conceivable, but the former extraction method adds productivity to the printing tact because the time for extraction is added, and the latter belt method degrades productivity. In the supply method, since the blanket taken out for reception is rewound and transferred again, there is no advantage over the conventional method in terms of alignment accuracy and tact.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides an offset printing apparatus and method capable of performing accurate printing many times many times without exchanging blankets even in the formation of a long pattern. The purpose is to provide.

[0008]

SUMMARY OF THE INVENTION An offset printing apparatus of the present invention is an offset printing apparatus for printing an ink pattern based on a pattern on a plate having a pattern formed on a flat plate and a blanket, and winding a long blanket. A supply roll for the attached blanket and a collection roll for collecting the blanket after printing, and the supplied blanket is brought into contact with the plate to receive ink, transferred to a work and transferred to the blanket for printing. The blanket roll is provided, and the offset printing method of the present invention is characterized in that a blanket supply roll wound around a long blanket and a collection roll for collecting the blanket after printing are used, and a supplied blanket is used. A block that accepts ink and transfers a blanket that transfers it to the workpiece Using a device equipped with a blanket roll, a step of receiving the ink by contacting the blanket with the plate according to the movement while simultaneously moving the plate and the work, and a blanket receiving the ink continuously from the above step. The step of transferring to the work and the step of collecting the blanket after use of printing are performed simultaneously to perform printing.

According to the present invention, accurate printing can be performed many times in a short period of time without exchanging blankets even in forming a long and long pattern.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing a schematic configuration of an offset printing apparatus according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a printing process in an embodiment of the offset printing apparatus and method of the present invention. FIG. 2A is an explanatory view of an ink filling step, and FIG. 2B is an explanatory view of a step in which reception and transfer are performed simultaneously. It is needless to say that there is a time zone before and after the step in which the reception and the transfer are performed at the same time, in which only the reception and the transfer are performed and the table is moved. In FIG. 1, 1 is an intaglio made of a glass plate, 2 is a groove formed on the surface of the intaglio 1 by a process such as photoetching, 3 is ink, 4 is a doctor blade, 5 is a blanket roll, 6 is a blanket supply roll. The blanket after printing is supplied to the collecting roll 8 and supplied from the collecting roll 8. 9 is a work.

Hereinafter, a printing process using the printing machine configured as described above will be described. First, as shown in FIG. 2 (a), after the ink 3 is applied on the intaglio 1 and the doctor blade 4 is moved in the direction of the arrow to scrape the ink 3, the grooves 2 are formed.
Only the ink 3 remains, and a pattern is formed. Next, as shown in FIG. 2B, the intaglio 1 is moved in the direction of the arrow X and the work 9 is moved in the direction of the arrow Y, and the blanket roll 5 is rotated in the direction of the arrow Z to supply the ink from the supply roll 7. The blanket 6 receives the ink 3 from the intaglio 1 and transfers it to the work 9 after a half rotation,
After the pattern shape by the groove 2 on the intaglio 1 is formed on the work 9, the blanket 6 after printing is collected by the collection roll 8. These operations are performed simultaneously.

In this case, a large-diameter blanket roll for receiving all the patterns is not required, and ink receiving and transferring (printing) and most of the work of exchanging the plate and the work are simultaneously performed. In addition, since blanks are supplied and collected for use, the blanket is always printed with a new blanket in which the solvent absorption capacity has not deteriorated. Even in the case of a long pattern, accurate offset can be performed in a short time. Printing can be performed many times without changing blankets.

As described above, according to the present embodiment, most of the operations of receiving and transferring ink (printing) and replacing the plate and the work can be performed at the same time, and can easily cope with a long pattern. Yes, the number of blanket changes is greatly reduced, and productivity is improved.

The positional relationship between the intaglio and the work and the direction of supplying and collecting the blanket in the above embodiment are not limited to those described above. Instead of the intaglio, another so-called pattern forming plate may be used.

[0016]

As described above, according to the present invention, most of the operations of ink reception and transfer (printing) and replacement of a plate and a work can be performed at the same time, and even if the pattern becomes long, it can be easily handled. At the same time, the number of times of blanket replacement is greatly reduced, so that an advantageous effect that productivity can be improved can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of an embodiment of an offset printing apparatus according to the present invention.

FIG. 2 is an explanatory diagram of a printing process in an embodiment of an offset printing apparatus and method according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intaglio 2 Groove 3 Ink 4 Doctor blade 5 Blanket roll 6 Blanket 7 Supply roll 8 Collection roll 9 Work

Claims (2)

[Claims] 1. An offset printing apparatus for printing an ink pattern based on a pattern formed on a flat plate through a blanket and a blanket, comprising: a blanket supply roll wound with a long blanket; A collection roll for collecting the blanket, and a blanket roll for contacting the supplied blanket with the plate to receive ink, transferring the blanket to a work, and transferring the blanket for printing, and a blanket after printing use are provided. An offset printing apparatus characterized in that the sheet is collected by a collecting roll through the space between the work and a blanket roll. 2. An offset printing apparatus for printing an ink pattern based on a pattern formed on a flat plate and a blanket via a blanket, comprising: a blanket supply roll wound with a long blanket; and a blanket after printing. Roll and a blanket roll that transfers the blanket that transfers the blanket to the work.The plate and the work are simultaneously moved while facing each other. At the same time, the step of receiving the ink by bringing the blanket into contact with the plate, the step of transferring the blanket that has received the ink to the work, and the step of collecting the blanket after printing are performed simultaneously with the above-described printing. And an offset printing method.