JPH0866998A - Screen printer - Google Patents

Abstract

PURPOSE: To keep a printing ink coated without exposing a printing pattern of a screen printing plate at the time of squeezing by forming a plate section in the width direction at least on a part of a squeezing section of a screen printer with scraper. CONSTITUTION: In a squeezing section 4, an air cylinder 8 is stretched, and a squeegee plate 4a is lowered in a manner of stretching a screen printing plate 7a and pressing and bringing the screen printing plate into contact with the upper face of a body 6 to be printed, and then the screen printing plate is moved horizontally and passed through a printing pattern 7b reproduced on the printing plate 7a, and excessive ink I is scraped while ink I is transferred to the upper face of the body 6 to be printed. Of the ink I to be scraped to the left of the plate 4a, the ink I on a section above a squeegee plate lower end 4d of the plate 4a of the squeezing section 4a is discharged from a slit 4b to the rear face side of the plate 4a. The exposure of the face of the printing plate 7a is eliminated by the discharged ink I, and the drying of ink I adhered to a reproduced section 7b and also the clogging of the printing plate 7a can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing machine using a screen printing plate.

[0002]

2. Description of the Related Art The prior art will be described with reference to the drawings. The screen printing machine is shown in FIG. 6 for explaining the operation of the screen printing machine.
As shown in the drawing on the outline side, the platen 1 for holding the screen printing plate 7a appropriately made into a plate and mounting and fixing the substrate 6 to be printed and the printing ink I supplied to the screen printing plate 7a A squeegee portion 4 for transferring the material to be printed 6 through the screen printing plate 7a and a scraper portion 5 for coating and supplying the printing ink I on the surface of the screen printing plate 7a are provided.

FIGS. 6 (a) to 6 (g) are schematic side views for explaining the printing operation when a colored pattern is formed by printing on a printing medium using the conventional screen printing machine described above. As shown in FIG. 6 (a), the positioned printing medium 6 is placed and fixed on the printing platen 1, and the printing ink I is previously supplied onto the screen printing plate 7a surface.

Subsequently, as shown in FIG. 6B, the squeegee portion 4 is moved downward from the position where the squeegee portion 4 is above the right edge of the screen printing plate 7a in the drawing, and the screen printing plate 7a is printed. The upper surface of the body 6 is contacted.

Subsequently, as shown in FIG. 6 (c), the squeegee portion 4 is moved horizontally relative to the screen printing plate 7a in the left direction of the drawing, and the screen printing plate 7a is printed. It is pressed against the upper surface, and through the printing pattern 7b made on the screen printing plate 7a, onto the upper surface of the object 6
The pattern-shaped printing ink I is transferred, and the excess ink I is scraped off. (This operation is called squeezing)

Subsequently, as shown in FIG. 6 (d), the squeegee portion performs a rising return operation. After that, FIG. 6 (e)
As shown in, the scraper unit 5 is moved down from the position where the scraper unit 5 is above the left corner of the screen printing plate.

Subsequently, as shown in FIG. 6 (f), the scraper unit 5 horizontally moves the printing ink I gathered at the left corner on the screen printing plate 7a,
It is spread on the screen printing plate 7a with a predetermined film thickness, and as shown in FIG. 6 (g), it is moved to the right corner of the screen printing plate 7a, the printing ink I is coated on the screen printing plate 7a, and the supply is performed. Immediately after that, the ascending return operation is immediately performed, and the one-cycle printing operation is completed.

However, in the above method, the surface of the screen printing plate 7a covered with the printing ink I is exposed by squeezing, and the printing ink I attached to the printing pattern 7b of the screen printing plate 7a is dried at this time. Therefore, there is a problem that the printing pattern 7b of the screen printing plate 7a is clogged.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a mechanism for keeping the printing ink I always covered without exposing the printing pattern 7b of the screen printing plate 7a during squeezing. An object is to provide a characteristic screen printing machine.

[0010]

In order to solve the above problems, the present invention provides a printing plate for holding a plate frame of a screen printing plate horizontally and arranging an object to be printed below the screen printing plate. A squeegee that can be moved up and down in the printing width direction above the board and the screen printing plate and horizontally movable in the printing direction relative to the screen printing, and can be moved up and down in parallel with the squeegee. A screen printing machine provided with a scraper capable of moving horizontally in the printing direction relative to the screen printing plate, wherein at least a part of the squeegee section is provided with a slit section in the width direction. Further, in the above screen printing machine, another squeegee portion may be provided instead of the scraper.

[0011]

In the screen printing machine of the present invention, the squeegee section 4 is provided with the slit section 4b in the printing width direction. Therefore, the screen printing plate 7a coated with the printing ink I is provided for each cycle of the printing machine. When squeezing the surface, the printing ink I pushed by the squeegee plate 4a is pushed out to the back side (right side in the drawing) of the squeegee plate 4a from the slits 4b provided in the squeegee plate 4a, and at the same time as the squeegee screen. Since the surface of the printing plate 7a is covered again, the surface of the screen printing plate 7a is not exposed, preventing the printing ink I adhering to the plate-made printing pattern 7b from drying and preventing clogging of the screen printing plate 7a. it can. This effect is the same even if the scraper part is replaced with a squeegee part.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the screen printing machine of the present invention will be described with reference to the drawings. In FIG. 1, the printing platen 1 is provided with a chuck mechanism (clamper chuck or vacuum chuck) for mounting and fixing the printing medium 6.

A screen plate frame holding frame portion 2 is provided so as to cover the printing platen 1 and holds the plate frame 7 horizontally. The screen frame holding frame 2 can be moved up and down by a driving mechanism such as a pneumatic or hydraulic cylinder, and in the lowering operation (bottom stop position), the lower surface of the screen printing plate 7a and the printing platen. A slight gap is formed between the upper surface of the printing medium 6 mounted and fixed on the first substrate 1.

The movable mount 3 is fitted to a linear guide horizontally provided on the screen plate frame holding frame 2 so as to straddle the screen printing plate 7a, and is driven by a driving mechanism such as a pneumatic or hydraulic cylinder. It is equipped so that it can move horizontally along it.

The movable base 3 is provided with a scraper portion 5 which can be moved up and down in a vertical direction (a substantially vertical direction or a direction slightly inclined to the right side in the drawing), and a vertical direction on the right side in the drawing adjacent to the scraper portion 5. The squeegee portion 4 is capable of moving up and down (almost vertically or in a direction slightly inclined to the left in the drawing).

A scraper 5a is attached to the lower end of the scraper unit 5, and in the lowering operation (lower stop position), the lower end of the scraper plate 5a and the screen printing plate 7 are attached.
a A slight gap is formed between the upper surface of the printing ink I and
Can be coated on the surface of the screen printing plate 7a with a film thickness within the range of the gap. The scraper part 5 is
At the tip of the downward operating rod 9a of the air cylinder 9,
The scraper plate 5a is attached almost vertically or in an inclined direction in which the upper part approaches the squeegee 4.

At the lower end of the squeegee portion 4, a squeegee plate 4a
Is attached, and in the lowering operation (bottom stop position), the screen printing plate 7a is extended, and the lower surface of the screen printing plate 7a is brought into contact with the upper surface of the printing medium 6. The squeegee 4 has a squeegee plate 4a attached to a tip end portion of a downward actuating rod 8a of an air cylinder 8 in an inclined direction in which a squeegee plate 4a is substantially vertical or an upper portion approaches a scraper portion 5.

FIG. 2 is a partially enlarged explanatory view of the squeegee portion. In the structure shown in FIG. 2A, a squeegee plate 4a is attached to the lower end portion of an operating rod 8a that expands and contracts downward in the air cylinder 8 via a mounting jig 4c. The squeegee 4a is attached in a vertical direction or an inclined direction, and a slit 4b is provided in the printing width direction slightly above the lower end 4d of the squeegee plate. In this embodiment, a slit 4b having a width of 10 mm and a width of 10 mm from the lower end 4d of the squeegee plate is provided in the printing direction. The width of the squeegee and the distance from the lower end 4d of the squeegee plate may be appropriately selected according to printing conditions such as the angle of the squeegee, the squeegee speed, and the ink amount.

2B, a square squeegee 4e is attached to the lower end of the operating rod 8a of the air cylinder 8 via a fixture 4c, and the fixture 4c slightly above the square squeegee 4e. In addition, the slit 4b may be provided in the print width direction.

FIG. 3 is a view for explaining the function of the slit 4b. As shown in FIG. 3, the squeegee unit 4 extends the operating rod 8a of the air cylinder 8 to extend the squeegee plate 4a to the screen printing plate 7a and to print the printed material 6
After descending so as to be pressed against the upper surface, the ink I is transferred in a pattern shape onto the upper surface of the printing object 6 through the printing pattern 7b made on the screen printing plate 7a by moving horizontally relative to the left in the drawing. While doing so, scrape off excess ink I.

The squeegee portion 4 has a portion of the printing ink I scraped off to the left in the drawing by the squeegee plate 4a.
The printing ink I, which is located above the lower end 4d of the squeegee plate 4a of the squeegee plate 4a, is discharged from the slit 4b to the back side of the squeegee plate 4a. The ink I discharged to the back side can eliminate the exposure of the surface of the screen printing plate 7a, prevent the printing ink I adhering to the plate-formed pattern portion 7b from drying, and prevent clogging of the screen printing plate 7a. it can.

Next, the printing operation of the screen printing machine according to the embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 4A, the positioned printing medium 6 is placed and fixed on the printing platen 1, and the printing ink I is previously supplied onto the surface of the screen printing plate 7a.

Subsequently, as shown in FIG. 4 (b), the squeegee portion 4 is moved downward from the position where the movable frame 3 is above the right end of the screen printing plate 7a in the drawing, and the screen printing plate 7a is extended to extend it. The upper surface of the printed body 6 is contacted.

Subsequently, as shown in FIG. 4 (c), the movable frame 3 is moved horizontally relative to the screen printing plate 7a in the left direction of the drawing to move the screen printing plate 7a to the upper surface of the printing medium 6. The printing ink I having a pattern shape is transferred to the upper surface of the printing target 6 through the printing pattern 7b formed on the screen printing plate 7a.
Scrape off. At this time, the scraped ink I is pushed out to the back side of the squeegee plate 4a from the slits 4b formed in the squeegee plate 4a, and covers the screen printing plate 7a surface again.

Subsequently, as shown in FIG. 4 (d), when the movable gantry 3 reaches the left corner of the screen printing plate 7a in the drawing, the squeegee unit 4 moves up and returns.

Subsequently, as shown in FIG. 4 (e), the scraper unit 5 is moved down from the position where the movable base 3 is above the left end of the screen printing plate 7a in the drawing.

Subsequently, as shown in FIG. 4 (f), the ink supply base 3 is horizontally moved relative to the screen printing plate 7a in the right direction of the drawing, and the printing ink I on the surface of the screen printing plate 7a is moved. It is evenly spread on the screen printing plate 7a with a predetermined film thickness, and as shown in FIG. 4 (g), the ink supply base 3 is moved to a position above the right corner of the screen printing plate 7a, and the printing ink I is printed. 7a is coated and supplied, and immediately after that, the scraper unit 5 performs an ascending return operation, and one cycle of the printing operation is completed.

As another embodiment of the present invention, there is a double squeegee system in which two squeegee plates 4 are provided in parallel in a printing width direction on a movable base 3 as shown in FIG. 5, which is a squeegee. At the same time, since the ink is applied onto the plate, the squeegee operation can be immediately performed with the other squeegee, and the printing speed can be increased. The squeegee portion 4 is attached to the tip end portion of the downward operating rod 8a of the air cylinder 8 in a tilting direction in which the squeegee plates 4a are substantially vertical or the upper portions thereof approach each other. In this embodiment, separate squeegees are used in the left-right direction, but a mechanism for changing the angle or the like in the left-right direction is provided, or a single squeegee can be used by using a square squeegee as shown in FIG. 2B. .

Although the screen printing plate 7a is held so as to have a slight gap from the upper surface of the material 6 to be printed in the above-mentioned one embodiment or another embodiment, in the present invention, this is used. However, the structure is not limited to this, and may have a structure in which the screen printing plate 7 a is brought into contact with and held by the printing medium 6.

[0030]

The screen printing machine of the present invention has a slit 4b formed in the print width direction on at least a part of the squeegee portion 4 of the movable base 3 so as to prevent
In order to prevent the screen printing plate 7a from being exposed, the excess ink I of the scraped ink I is extruded to the back surface side of the squeegee plate 4a and covered again on the surface of the screen printing plate 7a. There is an effect of preventing clogging of the screen printing plate 7a due to the impression of the attached ink I at the time of exposure.

[0031]

[Brief description of drawings]

FIG. 1 is a schematic side view illustrating an embodiment of the present invention.

FIG. 2 is a partially enlarged explanatory view of a squeegee portion of the screen printing machine of the present invention.

FIG. 3 is an explanatory view showing the action of a slit 4b in the present invention.

FIG. 4 is an explanatory diagram of a printing operation by the screen printing machine according to the embodiment of the present invention.

FIG. 5 is a schematic side view illustrating another embodiment of the present invention.

FIG. 6 is a diagram illustrating a printing operation performed by a conventional screen printing machine.

[Explanation of symbols]

1 ... Printing surface plate 2 ... Screen plate frame holding frame 3 ...
Mobile stand 4 ... Squeegee part 4a ... Squeegee plate 4b ...
Slit 4c ... Squeegee plate attachment jig 4d ... Squeegee plate lower end 4e ... Square squeegee 5 ... Scraper part
5a ... Scraper plate 6 ... Printed body 7 ... Plate frame 7a
... screen printing plate 7b ... printing pattern 8, 9 ... air cylinders 8a, 9a ... operating rod
I ... Ink

Claims (2)

[Claims] 1. A screen printing plate holding a plate frame horizontally,
A printing platen for arranging an object to be printed below the screen printing plate, and can be moved up and down in the printing width direction above the screen printing plate and horizontally in the printing direction relative to the screen printing. At least one of a squeegee unit in a screen printing machine including a movable squeegee and a scraper that is adjacent to and parallel to the squeegee and that can vertically move and horizontally move in a printing direction relative to a screen printing plate. A screen printing machine characterized in that a slit portion is provided in the width direction in the portion. 2. The screen printing machine according to claim 1, wherein a squeegee having a slit portion in the width direction is provided in at least a part of the scraper instead of the scraper.