JP2000141589A - Mechanism for cleaning doctor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the disadvantage due to sticking of ink to a doctor blade and further to improve the efficiency of use of ink. SOLUTION: In order to scrape off the ink sticking to the edge 204 of a doctor which gives the ink 203 to an intaglio 201 and simultaneously scrapes off surplus ink with the relative movement with the intaglio 201, in an offset printing apparatus, a plate-shaped member 208 is disposed at a position where it can scrape off the ink having stuck to the edge 204 of the doctor with the relative movement with the intaglio 201 continued. Besides, a collecting part 207 disposed for recovery of collected ink so that the ink scraped by the plate- shaped member 208 is collected therein is provided below the plate-shaped member 208.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning mechanism for a blade of a doctor blade in offset printing using an intaglio printing plate.

[0002]

2. Description of the Related Art Conventionally, various methods have been considered as a method for producing an electron source substrate in which elements such as a circuit board, a liquid crystal display element, and an image forming apparatus and wiring are arranged on the substrate. As a method, there is a method in which all device electrodes, wirings, and the like are formed by photolithography. For example, when forming fine-patterned wiring, the photolithography method first forms a conductive layer, forms a resist layer thereon, and then exposes and develops the resist layer. The layer is etched and the remaining resist layer is stripped off.

On the other hand, the printing method is suitable for forming a large-area pattern. A large number of surface conduction electron-emitting devices are formed on a substrate by forming device electrodes of the surface conduction electron-emitting device by the printing method. It can be formed. It is also advantageous in terms of cost. In the formation of element electrodes by a printing method, an offset printing technique suitable for forming a thin film is used. An example in which this offset printing technique is applied to a circuit board is disclosed in JP-A-4-290295. In the substrate disclosed in this publication, angles of a plurality of bonding electrodes connected to circuit components are changed in order to eliminate bonding defects due to variations in electrode pitch dimensions due to pattern expansion and contraction during printing. . Japanese Patent Application Laid-Open No. 4-290295 describes that an electrode pattern is formed by offset printing.

A general offset printing apparatus and printing method for forming an electrode pattern, a color filter and the like will be described below. FIG. 4 is a plan view showing a conventional flatbed proofing machine type offset printing apparatus that performs an offset printing method. In FIG. 1, reference numeral 101 denotes an ink mixing table on which ink 107 is spread by an ink roller 104; and 102, a platen for fixing an intaglio 105. Reference numeral 103 denotes a work surface plate for fixing a work 106 to be printed, which is fixedly disposed on the main body frame 108. Two rack gears 109 and 110 are arranged on both sides of the three platens arranged in a row, and the rack gears 109 and 11 are arranged.
A blanket 113 in which the gears 111 and 112 are engaged is disposed on the zero. The axis of the blanket 113 is fixed by carriages 114 and 115 at both ends, and the carriages 114 and 115 move forward and backward by the crank operation of the crank arm from the lower part of the main body. And on the work 106 in order. A rubber-like blanket rubber is attached to the surface of the blanket 113. The position information of the ink pattern printed on the work 106 is taken in by the alignment scope, and the position of the work surface plate 103 is finely adjusted every time the work 106 is exchanged to align the work 106 at a predetermined position.

FIGS. 5A to 5D are views showing an offset printing process. In the figure, 101 is an ink mixing stand, 105 is an intaglio, and 106 is a glass substrate serving as a work, which are arranged in series on the same plane. 10
Reference numeral 4 denotes an ink roll, which transfers the ink 107 kneaded on the ink kneading table 101 onto the intaglio 105 (FIG. 5).
(A)). Reference numeral 117 denotes a blade that slides on the upper surface of the intaglio 105 to scrape out of the transferred ink 107 other than the ink filled in the recesses (FIG. 5B). Reference numeral 113 denotes a blanket, which is an intaglio 105 and a glass substrate 10.
6, the ink filled in the concave portions of the intaglio 105 is received by rotating contact with the upper surface of the intaglio 105 (FIG. 5C), and the ink 107 is transferred onto the glass substrate 106 in the pattern of the intaglio 105 (FIG. 5C). 5 (d)).

[0006] Thus, the printing process is completed. The printing ink 107 can be appropriately selected depending on the function of the pattern to be formed. That is, ink containing organic Au metal called Au resinate paste is mainly used for an electrode pattern of a recording thermal head or the like, and R, G, and B color pigments are used for a color filter used in a liquid crystal display device or the like. Dispersed inks, inks containing organic dyes, and the like are used. In such offset printing,
After supplying ink to the intaglio pattern portion, the pattern is filled with ink by scratching the plate surface with a doctor blade, and unnecessary ink is removed from the plate with a doctor blade. Then, the filled ink is transferred to a blanket in a pattern, and further transferred to a printing medium to obtain a desired print pattern.

[0007]

However, in such prior art, extra ink not filled in the intaglio plate adheres to the blade edge of the doctor blade due to the above-described ink supply and doctoring operation. At the same time, the ink attached to the blade edge gradually increases due to the doctoring operation in continuous printing, and eventually drops down. Therefore, it is necessary to perform a cleaning operation for wiping ink adhered to the blade edge of the doctor blade every time or every several times after the printing operation. This complicated wiping operation depends on humans, is inefficient, and has a problem that the printing tact is extended and the working efficiency is reduced.
Further, most of the supplied ink becomes excess ink at the time of doctoring, and is wiped off and discarded, so that there is a problem in the efficiency of ink use.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art and to solve the problems caused by the adhesion of ink to a doctor blade in offset printing, and to improve the efficiency of ink use.

[0009]

In order to achieve this object, a doctor cleaning mechanism according to the present invention fills an intaglio plate with ink by relative movement with the intaglio plate in an offset printing apparatus and, at the same time, scrapes off excess ink. In order to scrape off the ink attached to the doctor, a plate-shaped member is provided at a position where the ink attached to the blade of the doctor can be scraped off by continuing the relative movement.

[0010] According to this, since the excess ink adhering to the blade of the doctor after the doctor ring comes into contact with the plate-shaped member of the doctor cleaning mechanism every time, the blade of the doctor is always refreshed, and the blade of the doctor is always refreshed. This eliminates the necessity of wiping the ink accumulated in the ink. Therefore, the printing work efficiency is improved. In addition, by collecting and reusing the ink scraped from the doctor by the plate-shaped member, the use efficiency of the ink is improved.

[0011]

In a preferred embodiment of the present invention, a reservoir for collecting the accumulated ink is disposed below the plate-like member so as to collect the ink scraped off by the plate-like member. Have. Thus, the scraped ink is automatically collected and easily reused. The plate-like member and the pool may be provided in a non-image area of the intaglio.

The plate-like member has, for example, elasticity or flexibility. When the relative movement of the intaglio and the doctor is continued during the doctor ring, the plate-like member comes into contact with the blade edge of the doctor at an acute angle, and then contacts the blade. While scraping, remove the ink adhering to the blade of the doctor. In this case, the plate-like member can be made of an elastic steel material for a leaf spring, a flexible resin or an elastomer.

Further, the plate-shaped member may be provided so as to be rotatable around an axis parallel to the blade edge of the doctor. In this case, a highly rigid plate-like member can be used.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing a doctor cleaning mechanism according to an embodiment of the present invention, and is a cross-sectional view showing a state in which a doctor blade has made contact with a plate-shaped projection of the cleaning mechanism after a doctor ring operation. Intaglio 2
01 is a glass or metal substrate (Ni-C
A large number of rectangular pad patterns having a width of 150 μm, a length of 300 μm, and a depth of 8 μm are arranged in the pattern portion 202. In addition, as the ink 203, a Pt resinate paste made of an organic metal (MO Paste E-3100, manufactured by NE Chemcat Co., Ltd.) diluted with a BCA solvent is used.

As the doctor blade 204, an MDC doctor blade (precision hardened steel strip, blade thickness 650 μm, width 0.2 mm, hardness Hv580) is used, and the protrusion from the doctor holder 205 is adjusted to 5 mm. The doctor rake angle in the traveling direction is 60 degrees, and the pushing amount is set to 2 mm.

The doctor cleaning mechanism is constructed by attaching an elastic stainless steel plate 208 to an acrylic resin flat plate 206. The stainless plate 208 has a thickness of 0.2 mm, a width of 4 mm, and a length of 350 mm, and is adjusted to a rake angle of 45 degrees in a direction with respect to the doctor blade 204, so that the stainless plate 208 is positioned in parallel with the intaglio 201 and parallel to the doctor blade 204. It is installed in. Also stainless plate 2
A recessed groove 207 having a width of 10 mm is formed in the acrylic resin flat plate 206 below 08.

In this configuration, the doctor blade 204, which has completed the doctoring operation, moves on the non-image portion of the intaglio 201 while dragging the ink 203, and directly moves the acrylic resin flat plate 206 of the doctor cleaning mechanism.
Move up. Then, as shown in FIG. 1A, the tip of the stainless steel plate 208 contacts the upper part of the blade edge on the back side of the doctor blade 204 at an angle. At this time, extra ink 203 adheres to the inside of the doctor blade 204, but as shown in FIG.
As the stainless steel plate 208 is brought into contact with the stainless steel plate 208 due to elasticity as it moves, the extra ink 203 is scraped off by the stainless steel plate 208. Further, as shown in FIG. 1C, the accumulated ink 203 is removed from the groove 207 immediately below.
And can be easily collected in another container.

As described above, the surplus ink 203 on the cutting edge can be removed and the ink 203 can be easily recovered by only a simple moving operation of the doctor blade 204. Therefore, the ink use efficiency can be improved.

In the above description, the doctor cleaning mechanism is constructed by attaching the stainless steel plate 208 to the acrylic resin flat plate 206.
A doctor cleaning mechanism may be formed by forming a plate-like projection on the first non-image area and processing an ink reservoir groove. This also has a similar doctor cleaning effect.

As a plate-like projection member for scraping off excess ink from the doctor blade 204, a flexible resin plate 209 as shown in FIG. A 4 mm PET material or an elastomer can also be used. This also makes it possible to contact the doctor blade 204 and remove excess ink.

Further, instead of the projection member such as the stainless steel plate 208, a member 210 attached so as to be capable of rotating as shown in FIG. 3 may be used.
In this case, as the member 210, a general metal material having high rigidity or a material having no elasticity such as ceramics can be used.

[0022]

As described above, according to the present invention, the ink adhering to the blade of the doctor is automatically scraped by the continuous moving operation after the scraping of the ink by the doctoring operation. For example, printing time can be improved by eliminating time loss such as the above. Further, by collecting and reusing the ink scraped from the doctor, the use efficiency of the ink can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a doctor cleaning mechanism according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a doctor cleaning mechanism according to another embodiment of the present invention.

FIG. 3 is an explanatory view showing a doctor cleaning mechanism according to still another embodiment of the present invention.

FIG. 4 is a top view showing an offset printing apparatus according to a conventional example.

FIG. 5 is a side view showing an offset printing process according to a conventional example.

[Explanation of symbols]

201: intaglio, 202: pattern portion, 203: ink,
204: doctor blade, 205: doctor holder, 20
6: acrylic resin flat plate, 207: concave groove, 208: stainless steel plate, 209: PET plate, 210: metal plate.

Continued on the front page (72) Inventor Riko Midorikawa 3-30-2 Shimomaruko, Ota-ku, Tokyo F-term in Canon Inc. (reference) 2C250 DC10 FA17 FB06

Claims (7)

[Claims] In the offset printing apparatus, the relative movement is continued by filling the ink into the intaglio by the relative movement with the intaglio and simultaneously scraping the ink attached to the blade edge of the doctor who has scraped off the excess ink. A doctor cleaning mechanism, comprising: a plate-shaped member arranged at a position where the ink attached to the blade of the doctor can be scraped off. 2. The ink jet printer according to claim 1, further comprising: a reservoir for recovering the accumulated ink, disposed below the plate-like member so as to collect the ink scraped off by the plate-like member. The doctor cleaning mechanism as described. 3. The doctor cleaning mechanism according to claim 2, wherein the plate-like member and the pool are provided in a non-image area of the intaglio. 4. The plate-like member has elasticity or flexibility, and due to the continuation of the relative movement, first comes into contact with the blade edge of the doctor at an acute angle downward, and then adheres to the blade edge of the doctor while bending. The doctor cleaning mechanism according to any one of claims 1 to 3, wherein the doctor cleaning mechanism is configured to scrape off the ink. 5. The doctor cleaning mechanism according to claim 1, wherein the plate-like member is made of an elastic steel material for a leaf spring. 6. The doctor cleaning mechanism according to claim 1, wherein the plate member is made of a flexible resin or an elastomer. 7. The doctor according to claim 1, wherein the plate-shaped member is provided so as to be rotatable around an axis parallel to a blade edge of the doctor. Cleaning mechanism.