JP3694131B2 - Screen printing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a screen printing apparatus, and more particularly to a screen printing apparatus provided with a printing paste receiving means for preventing printing paste such as ink dropped from a squeegee from hindering the operation of the apparatus.
[0002]
[Prior art]
Screen printing equipment is used not only for general screen printing using screen printing ink, but also for printing paste such as cream solder and insulator paste on the substrate in the production process of electronic circuit boards (hereinafter abbreviated as substrates). It is also used for coating purposes. Here, a screen printing apparatus that applies the cream solder to the substrate will be described. FIG. 2 is a front view showing a main configuration of a screen printing apparatus for applying cream solder to a predetermined position of a circuit pattern on a substrate.
[0003]
In FIG. 2, a screen printing apparatus 20 is mounted on a table at a supply position, a print head drive unit 4 for moving the squeegee 9 to a predetermined printing range, a screen 2 on which a printing opening corresponding to a circuit pattern is formed. The stage 5 is configured to move and position the placed substrate 5 below the screen 2.
[0004]
The stage unit 3 is moved in the direction of the arrow by the ball screw mechanism 6, and when the substrate 5 is supplied from a loader (not shown) at the supply position, it moves below the screen 2 as shown in FIG. The stage unit 3 is provided with a positioning mechanism 7 for positioning the substrate 5 on the screen 2 by driving in the horizontal direction, the vertical direction, and the horizontal plane rotation direction. When the substrate 5 is positioned at a predetermined position below the screen 2, the squeegee 9 that moves in the direction indicated by the arrow by the print head drive unit 4 passes the cream solder 8 supplied on the screen 2 through the printing opening of the screen 2. Printing on the substrate 5.
[0005]
[Problems to be solved by the invention]
In the above configuration, when the substrate 5 to be printed is changed and replaced with the screen 2 corresponding to this, as shown in FIG. 3, the stage unit 3 is retracted to the supply position, and the screen 2 is not shown in the setting replacement position. Move to. At this time, if the cream solder 8 adhering to the squeegee 9 falls, it adheres to a drive mechanism portion such as the ball screw mechanism 6 and causes malfunction of the apparatus. Since the cream solder 8 has a high viscosity, as shown in FIGS. 4A, 4B, and 4C, when the squeegee 9 is lifted by the print head drive unit 4 and is separated from the screen 2, the squeegee 9 tends to adhere. When the amount of adhesion increases, there is a problem that it falls and adheres to the drive mechanism part, causing malfunctions or contaminating the apparatus.
[0006]
The present invention was devised to solve the above problems, and an object of the present invention is to provide a screen printing apparatus provided with a printing paste receiving means for preventing the printing paste dripping from the squeegee from adhering to the apparatus structure. It is what.
[0007]
[Means for Solving the Problems]
The present invention includes a squeegee that is moved by a print head drive unit, a screen that is disposed at a printing position below the squeegee at the time of printing, and that moves to a setup change position at the time of setup change, and a substrate placed on a table at a supply position. In a screen printing apparatus including a stage unit that moves a printed product to a lower portion of the screen disposed at a printing position and a driving unit that drives the stage unit, the print attached to the squeegee when the screen is replaced. One end of the printing paste receiving means to be received when the paste falls is fixed at a required position of the stage portion, and the stage portion moves below the squeegee as the driving means moves from the printing position to the supply position. It is configured as described above .
[0009]
The printing paste receiving means can be characterized in that one end of the belt wound up in a roll shape by a rewinding mechanism is fixed to a required position of the stage portion.
[0010]
Furthermore, a scraping means that abuts on the belt so as to scrape off the printing paste adhering to the belt when the belt is rewound can be provided.
[0011]
Furthermore, a scraping print paste storing means for storing the print paste scraped off by the scraping means can be provided.
[0012]
If the printing paste attached to the squeegee falls during screen changeover, there is no screen below the squeegee, and the dropped printing paste may adhere to the drive mechanism of the device and cause malfunctions. According to the present invention, since it is received by the printing paste receiving means, there is no malfunction or contamination of the apparatus. The printing paste receiving means is configured to move below the squeegee in conjunction with the movement of the stage portion that moves to the supply position when the screen is replaced . This configuration can be realized as a belt whose one end is fixed to the stage portion, and when the screen is replaced, the stage portion is retracted to the supply position, so that the movement pulls out from the rewinding mechanism, covers the lower part of the squeegee, and falls. Printing paste can be received with a belt. The printing paste received on the belt is removed by the scraping means, and the scraped printing paste can be accommodated in the printing paste accommodating means.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
[0014]
FIG. 1 is a front view showing the configuration of the main part of a screen printing apparatus according to an embodiment of the present invention. FIG. 1 (a) shows the state when the screen is replaced, and FIG. 1 (b) shows the received printing. The removal state of cream is shown. In addition, the same code | symbol is attached | subjected to the element common to the structure shown in the prior art example, and the description is abbreviate | omitted.
[0015]
1A, in the screen printing apparatus 1 according to the present embodiment, a belt (printing paste receiving means) in which one end is fixed to the stage unit 3 and the other end side is wound up in a roll shape by the rewinding mechanism 11. ) 10 is provided. Since one end of the belt 10 is fixed to the stage unit 3, the belt 10 is pulled out or unwound from the rewinding mechanism 11 as the stage unit 3 is moved by the ball screw mechanism 6. When the belt 10 has a width exceeding the length of the squeegee 9 (in the depth direction in the drawing) and the stage unit 3 is in the supply position shown in FIG. 1A, the belt 10 is pulled out and moved by the print head drive unit 4. Covers a structure such as the ball screw mechanism 6 with a length exceeding the range. Accordingly, as shown in the figure, when the screen 2 (see FIG. 2) is moved from the lower side of the squeegee 9 by changing the setup, even if the cream solder (print paste) 8 attached to the squeegee 9 drips down, As shown in the figure, it is received by the belt 10 and does not contaminate the structure and cause a malfunction in the drive mechanism portion or the like.
[0016]
As shown in FIG. 1B, the screen printing apparatus 1 is provided with a scraping tool (scraping means) 12, and the cream solder 8 that has fallen on the belt 10 has the stage portion 3 at the printing position. When the belt 10 is rewound to the rewinding mechanism 11 as it moves, it is scraped off by the scraper 12 whose tip abuts against the belt 10. The cream solder 8 scraped off by the scraper 12 flows on the scraper 12 and is stored in a container (print paste storage means) 13. The cream solder 8 stored in the container 13 can be appropriately processed by taking the container 13 out of the apparatus at any time.
[0017]
In the embodiment described above, the example in which the screen printing is applied to the cream solder application to the electronic circuit board has been described. Can be applied to.
[0018]
【The invention's effect】
As described above, according to the present invention, when the printing paste attached to the squeegee falls during the screen changeover, there is no screen below the squeegee, and the dropped printing paste adheres to the drive mechanism portion of the apparatus. Although there is a risk of malfunction, since it is received by the printing paste receiving means, the malfunction and contamination of the apparatus are eliminated. The printing paste receiving means is configured to move below the squeegee in conjunction with the movement of the stage portion that moves to the supply position when the screen is replaced . This configuration can be realized as a belt whose one end is fixed to the stage portion, and when the screen is replaced, the stage portion is retracted to the supply position, so that the movement pulls out from the rewinding mechanism, covers the lower part of the squeegee and falls. Printing paste can be received with a belt. The printing paste received on the belt is removed by the scraping means, and the scraped printing paste can be accommodated in the printing paste accommodating means.
[0019]
Therefore, in the screen printing apparatus having the above-described configuration, it is not necessary to manually clean the printing paste attached to the squeegee when changing the screen, and malfunction or contamination caused by the dropped printing paste adhering to the drive mechanism portion. Can be prevented.
[Brief description of the drawings]
FIGS. 1A and 1B are front views showing the configuration of a main part of a screen printing apparatus according to an embodiment of the present invention, in which FIG.
FIG. 2 is a front view showing a main configuration of a screen printing apparatus according to a conventional configuration.
FIG. 3 is a front view illustrating a problem of a screen printing apparatus according to a conventional configuration.
FIG. 4 is a schematic diagram for explaining the behavior of cream solder adhering to a squeegee with (a), (b), and (c).
[Explanation of symbols]
1 Screen Printer 3 Stage 4 Print Head Drive 8 Cream Solder (Print Paste)
9 Squeegee 10 Belt (print paste receiving means)
11 Rewinding mechanism 12 Scraper (scraping means)
13 Container (printing paste storage means)

Claims (1)

A squeegee that is moved by the print head drive unit, a screen that is disposed at a printing position below the squeegee at the time of printing, and that moves to the setup change position at the time of setup change, and a substrate placed on the table at the supply position is the print position. A screen printing apparatus comprising: a stage unit that is moved to a lower portion of the screen disposed in the screen; and a driving unit that drives the stage unit .
A printing paste receiving means for receiving when the printing paste attached to the squeegee falls at the time of changing the screen is fixed at one end to a required position of the stage section, and the stage section is moved from the printing position by the driving means. A screen printing apparatus configured to move below a squeegee as it moves to a supply position .

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