JPH0248949A - Offset printing method - Google Patents
Offset printing methodInfo
- Publication number
- JPH0248949A JPH0248949A JP63200351A JP20035188A JPH0248949A JP H0248949 A JPH0248949 A JP H0248949A JP 63200351 A JP63200351 A JP 63200351A JP 20035188 A JP20035188 A JP 20035188A JP H0248949 A JPH0248949 A JP H0248949A
- Authority
- JP
- Japan
- Prior art keywords
- printing
- magnetic
- image area
- ink
- magnetic drum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007645 offset printing Methods 0.000 title claims description 8
- 238000000034 method Methods 0.000 title claims description 6
- 230000005291 magnetic effect Effects 0.000 claims abstract description 42
- 238000007639 printing Methods 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 230000005389 magnetism Effects 0.000 claims description 2
- 239000011553 magnetic fluid Substances 0.000 abstract description 4
- 239000003086 colorant Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000004140 cleaning Methods 0.000 description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- -1 C o-N1P Inorganic materials 0.000 description 1
- 229910020630 Co Ni Inorganic materials 0.000 description 1
- 229910002440 Co–Ni Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Printing Plates And Materials Therefor (AREA)
- Rotary Presses (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、刷版を不要としたオフセット印刷方法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an offset printing method that does not require a printing plate.
従来のオフセット印刷は、製版機で２例えばディジタル
画像データから刷版を作成し、同刷版を版胴に装着し１
版に湿し水及びインキを供給し。In conventional offset printing, a printing plate is created using a plate-making machine, for example, from digital image data, and the printing plate is mounted on a plate cylinder.
Supply dampening water and ink to the plate.
そのインキをブランケット胴を介して印刷紙に転移させ
て行われている。The ink is transferred to the printing paper via a blanket cylinder.
従来のオフセット印刷では刷版の製作及びその取りつけ
が必要であった。刷版の製作作業、その装着作業及び見
当合わせ作業に時間を必要とするので小ロフト印刷のカ
ラー印刷には対応できないのが実情である。又、刷版の
製作装置２版胴に刷版を装着する装置が必要であるし、
刷版も含めてそれらに要する経費が高い。Conventional offset printing requires the production and installation of printing plates. The reality is that it is not possible to support color printing in small loft printing because it takes time to produce the printing plates, install them, and register them. In addition, a device for mounting the printing plate on the second plate cylinder of the printing plate manufacturing device is required.
The costs involved, including printing plates, are high.
本発明は前記の点を解決するために提案されたもので１
機上に製版機能を持たせたオフセット印刷方法を提供し
ようとするものである。The present invention was proposed to solve the above points.
The objective is to provide an offset printing method that has an on-machine plate-making function.
本発明は、従来の版胴に替えて１表面部に磁性体層を有
する磁気ドラムを設け、同磁気ドラムの非画線部に対応
する部分を磁気ヘッドで磁化して磁気潜像を形成し、前
記磁気ドラムの磁化された部分に磁気を利用して湿し水
を供給し２次いで前記磁気ドラムの表面にインキを供給
し、磁気ドラム表面のインキをブランケット胴を介して
印刷紙に転移させて印刷することを課題を解決するため
の手段とする。The present invention replaces the conventional plate cylinder with a magnetic drum having a magnetic layer on one surface, and magnetizes the portion of the magnetic drum corresponding to the non-image area with a magnetic head to form a magnetic latent image. , Supplying dampening water to the magnetized portion of the magnetic drum using magnetism, 2. Next, supplying ink to the surface of the magnetic drum, and transferring the ink on the surface of the magnetic drum to the printing paper via the blanket cylinder. The solution to the problem is to print with
第１図及び第２図に示す本発明方法を実施する４色刷枚
葉オフセット印刷機について説明する。A four-color sheet-fed offset printing machine that implements the method of the present invention shown in FIGS. 1 and 2 will be described.
第２図に印刷機の全体概略構造を、第１図に印刷ユニッ
ト部の概略構造を示している。１は磁気ドラムであり、
その表面は耐摩耗性がありかつ疏水性（親油性）がある
材料で表面処理されている。FIG. 2 shows the general structure of the printing press, and FIG. 1 shows the general structure of the printing unit. 1 is a magnetic drum;
Its surface is treated with a wear-resistant and hydrophobic (oleophilic) material.
又その下層は、磁性材料１例えばＦｅ３Ｏ４（フェライ
ト） 、 １−Ｆｅ３０４ （マグネタイト）、 Ｃ
ｏ−Ｎ１Ｐ、 Ｃｏ−Ｎｉ＋Ｃｏ−Ｐ、Ｃｏ−Ｃｒ、Ｃ
ｏＦｅ２Ｏ４等でアンダーコートされている。２は磁気
ヘッドで画像データ演算部１１より送られて来る画像デ
ータに対応して磁気ドラム表面上を部分的に磁化し磁気
潜像を形成する。３は湿し水供給装置であり、水性の磁
性流体１例えば′７グネタイト等の強磁性体を７０人〜
１４０人の微粉にし、界面活性剤処理をして水の溶剤中
に分散させたものを磁気ドラムの表面に供給する。４は
インキ供給装置である。５は磁気ドラムの表面をかき取
るブレードを有するクリーニング装置である。なおりリ
ーニング装置６は溶剤で洗浄するものでもよい。６は磁
気ドラムの磁気を消磁する消磁ヘッドである。７はブラ
ンケット胴、８は圧胴、９は給紙装置である。なお、磁
気ヘッド２と消磁ヘッド７には磁気ドラムが回転してい
る時ドラム回転方向にベツドが平行移動しながら、磁化
あるいは消磁するシリアルタイプとヘッドが磁気ドラム
の幅と同寸法のものが固定して設けられ、電気的に走査
して磁化あるいは消磁するラインタイプ等があるが、ど
ちらのタイプでもよい。画像データ演算部１１は、カラ
ースキャナ。The lower layer is made of magnetic material 1 such as Fe3O4 (ferrite), 1-Fe304 (magnetite), C
o-N1P, Co-Ni+Co-P, Co-Cr, C
It is undercoated with oFe2O4 or the like. A magnetic head 2 partially magnetizes the surface of the magnetic drum in response to image data sent from the image data calculation section 11 to form a magnetic latent image. 3 is a dampening water supply device, in which water-based magnetic fluid 1 is supplied with a ferromagnetic material such as '7 gnetite, etc.
140 powder, treated with a surfactant and dispersed in a water solvent, is supplied to the surface of a magnetic drum. 4 is an ink supply device. 5 is a cleaning device having a blade for scraping the surface of the magnetic drum. The cleaning device 6 may be one that cleans with a solvent. 6 is a demagnetizing head that demagnetizes the magnetic drum. 7 is a blanket cylinder, 8 is an impression cylinder, and 9 is a paper feeding device. In addition, the magnetic head 2 and the demagnetizing head 7 are fixed to a serial type whose bed is magnetized or demagnetized while moving in parallel in the direction of drum rotation when the magnetic drum is rotating, and a type whose head has the same size as the width of the magnetic drum. There is a line type that is provided as a magnet and is electrically scanned to magnetize or demagnetize, but either type may be used. The image data calculation unit 11 is a color scanner.
磁気ディスク、画像伝送等外部からの画像データを受は
入れ黒色を含む４原色に色分解されたデータに対しそれ
ぞれ適当な画素数及び階調数に分割演算する機能を持っ
ている。そして、各原色に対応した磁気ヘッド２に画像
信号を送る。It has a function of receiving image data from an external source such as a magnetic disk or image transmission, and dividing the data separated into four primary colors including black into an appropriate number of pixels and gradations. Then, image signals are sent to the magnetic heads 2 corresponding to each primary color.
つぎに、印刷作業について説明する。まず、外部より画
像データ演算部に入ったディジタル画像データはシアン
、マゼンタ、イエロ、ブラックの漬各原色に対応したデ
ータに分割される。分割された各々の色のデータは、１
鴫あたり１６６画素上で表現され、またその１画素も６
４階調以上の会調数で表現される様演算処理される。磁
気ドラム１が回転し、その全表面が消磁ヘッド６で消磁
される。前記画像データは磁化すべき非画線部データに
変換され磁気ヘッド２に送られ２回転している磁気ドラ
ム１の非画線部に対応している部分を磁化する。なお、
まず磁気ドラム１の全表面を磁化し１次に画像データの
画線部に対応する位ｊを消磁ヘッド６で消磁して非画線
部を磁化してもよい。この状態で印刷作業に入る。湿し
水供給装置３から数ミクロンメータの薄膜の水性の磁性
流体からなる湿し水が供給される。湿し水は磁化された
非画線部の磁力により非画線部に付着する。画線部は消
磁されたままであり、磁気ドラム１の表面は疏水性処理
がしであるので湿し水は付着しない。次にインキ供給装
置５でインキが供給されるが、インキは湿し水のない画
線部に付着する。磁気ドラム１表面の画線部のインキは
ブランケット胴７の表面に転移し、更に給紙装置９から
圧胴８上を運ばれる印刷用紙が圧胴８とブランケット胴
７の間を通過する時に印刷用紙に転移し印刷が行われる
。印刷用紙は中間胴を経由して次の圧胴８に運ばれ順次
４色印刷され排紙される。所定枚数の印刷が完了すると
、クリーニング装置５のブレードで磁気ドラム１の表面
のインキと磁性流体をかき取る。そして、消磁ヘッド６
で磁気ドラム１の全表面を消磁して作業終了となる。Next, printing work will be explained. First, digital image data input from the outside into the image data calculation unit is divided into data corresponding to each primary color of cyan, magenta, yellow, and black. The data of each divided color is 1
Each pixel is expressed on 166 pixels, and each pixel is 6
Arithmetic processing is performed to represent the number of tones of four or more gradations. The magnetic drum 1 rotates and its entire surface is demagnetized by a demagnetizing head 6. The image data is converted into non-image area data to be magnetized and sent to the magnetic head 2, which magnetizes the portion of the magnetic drum 1 which is rotating twice, corresponding to the non-image area. In addition,
First, the entire surface of the magnetic drum 1 may be magnetized, and then the portion j corresponding to the image area of the image data may be demagnetized by the degaussing head 6 to magnetize the non-image area. In this state, print work begins. A dampening water supply device 3 supplies dampening water consisting of an aqueous magnetic fluid in a thin film of several micrometers. The dampening water adheres to the non-image area due to the magnetic force of the magnetized non-image area. The image area remains demagnetized, and since the surface of the magnetic drum 1 has been subjected to hydrophobic treatment, dampening water does not adhere to it. Next, ink is supplied by the ink supply device 5, but the ink adheres to the image area where there is no dampening water. The ink on the image area on the surface of the magnetic drum 1 is transferred to the surface of the blanket cylinder 7, and when the printing paper carried over the impression cylinder 8 from the paper feeder 9 passes between the impression cylinder 8 and the blanket cylinder 7, printing is performed. Transferred to paper and printed. The printing paper is conveyed to the next impression cylinder 8 via an intermediate cylinder, sequentially printed in four colors, and then discharged. When a predetermined number of sheets have been printed, the blade of the cleaning device 5 scrapes off ink and magnetic fluid from the surface of the magnetic drum 1. And the degaussing head 6
The entire surface of the magnetic drum 1 is demagnetized and the work is completed.
（発明の効果〕
このように１本発明によると、印刷機上で画像データか
ら直接版が形成できるので、従来別途作成していた刷版
が不要となった。それにより、刷版の製作、装着作業が
不要となり、小ロフトのカラー印刷にも対応できるし１
かつそれに要する経費が不要となった。また、印刷機上
で画像データから直接版が形成できるので見当合わせ作
業も不要とできる。(Effects of the Invention) As described above, according to the present invention, a printing plate can be formed directly from image data on a printing press, so there is no longer a need for printing plates that were previously prepared separately. No installation work is required, and it can also be used for color printing in small lofts.
Moreover, the expenses required for this became unnecessary. Furthermore, since a plate can be formed directly from the image data on the printing press, registration work can be eliminated.
第１図及び第２図は本発明方法を実施ずＳ４色刷枚葉オ
フセット印刷機を示し、第１図は印刷ユニット部の概略
構成を示す、側面図、第２図は印刷機の全体概略構成を
示す側面図である。
１・・磁気ドラム、２・・磁気へ・ノド。
３・・湿し水供給装置、４・・インキ供給装置５・・ク
リーニング装置、６・・消磁ヘッド莞１０Figures 1 and 2 show an S4 color sheet-fed offset printing machine without implementing the method of the present invention, Figure 1 is a side view showing the schematic configuration of the printing unit section, and Figure 2 is the overall schematic configuration of the printing press. FIG. 1. Magnetic drum, 2. Magnetic throat. 3. Dampening water supply device, 4. Ink supply device 5. Cleaning device, 6. Demagnetizing head can 10
Claims (1)
する部分を磁気ヘッドで磁化して磁気潜像を形成し、前
記磁気ドラムの磁化された部分に磁気を利用して湿し水
を供給し、次いで前記磁気ドラムの表面にインキを供給
し、磁気ドラム表面のインキをブランケット胴を介して
印刷紙に転移させてなることを特徴とするオフセット印
刷方法A magnetic latent image is formed by magnetizing a portion of a magnetic drum having a magnetic layer on its surface corresponding to a non-image area using a magnetic head, and dampening water is applied to the magnetized portion of the magnetic drum using magnetism. An offset printing method characterized by supplying ink to the surface of the magnetic drum, and transferring the ink on the surface of the magnetic drum to printing paper via a blanket cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63200351A JPH0248949A (en) | 1988-08-11 | 1988-08-11 | Offset printing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63200351A JPH0248949A (en) | 1988-08-11 | 1988-08-11 | Offset printing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0248949A true JPH0248949A (en) | 1990-02-19 |
Family
ID=16422854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63200351A Pending JPH0248949A (en) | 1988-08-11 | 1988-08-11 | Offset printing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0248949A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5992323A (en) * | 1993-01-14 | 1999-11-30 | Nipson | Printing process employing removable erasable image portions |
| JP2007176155A (en) * | 2005-11-18 | 2007-07-12 | Jds Uniphase Corp | Magnetic plate for printing with optical effect |
| JP2011126074A (en) * | 2009-12-16 | 2011-06-30 | Process Bunkado:Kk | Magnetic printing plate and printing method using the same |
-
1988
- 1988-08-11 JP JP63200351A patent/JPH0248949A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5992323A (en) * | 1993-01-14 | 1999-11-30 | Nipson | Printing process employing removable erasable image portions |
| JP2007176155A (en) * | 2005-11-18 | 2007-07-12 | Jds Uniphase Corp | Magnetic plate for printing with optical effect |
| JP2011126074A (en) * | 2009-12-16 | 2011-06-30 | Process Bunkado:Kk | Magnetic printing plate and printing method using the same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3350098B2 (en) | Direct-to-press imaging systems and processes | |
| JPH0497848A (en) | Offset printing method and printing press | |
| CA1324803C (en) | Printing method and printed product | |
| EP1309175A3 (en) | Printing color management system, and printing color management method | |
| JPH0248949A (en) | Offset printing method | |
| EP0821320A3 (en) | Marking material saving method | |
| JPH01232366A (en) | Xerographic printing machine and multi- color printing | |
| JPH0248947A (en) | Offset press | |
| JPS63135248A (en) | Offset press | |
| JPH0248948A (en) | Offset press | |
| JP3105388B2 (en) | Printing method and printing machine for implementing the method | |
| US6782824B2 (en) | Printing unit with reversible image setting and digital changeover | |
| JPS6371347A (en) | Offset printing press | |
| JPS6371346A (en) | Offset printing press | |
| JPS60127154A (en) | Sheet-fed offset press | |
| JPS63134242A (en) | Offset press | |
| JPS63134241A (en) | Offset press | |
| US5309175A (en) | Imaging system for a printing press | |
| JPS63151456A (en) | Offset press | |
| JPS63151455A (en) | Offset press | |
| JPH07101045A (en) | Rotary press for newspaper | |
| JPH02122975A (en) | Multicolor printing method for curved-surface body | |
| US20050243377A1 (en) | Method for generating non-printing dots in a screened representation of an image | |
| JP3752111B2 (en) | On-press plate-fed printing press | |
| JP4354444B2 (en) | Plate making method and apparatus |