JPH0811285A - Screen printer - Google Patents

Abstract

(57) [Abstract] [Purpose] Efficiently and accurately position and hold the screen plate. A base on which a screen plate is placed, and a positioning member formed on the base for positioning a holding frame formed on the peripheral portion of the screen plate at a reference position.
A slide cylinder for inserting the clamp pin after moving the clamp pin on a positioning bush formed on a part of the positioned holding frame, and an air clamp for sandwiching the holding frame with the clamp pin inserted between the base and the base are provided. Hold the screen plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing apparatus for printing and applying a conductive paste on a green sheet by a screen printing method.

[0002]

2. Description of the Related Art Conventionally, this type of screen printing apparatus is
The squeegee is provided with a squeegee supported by a print head having a horizontal movement drive source, an air cylinder for advancing the squeegee toward the screen plate, and a screen plate placed on the paste application surface of the green sheet. The print head is horizontally moved while being pressed against the front surface of the screen plate to print the paste supplied to the front surface of the screen plate on the green sheet on the back surface of the screen plate.

In this case, in the conventional screen printing apparatus, when the screen plate is held, the screen plate is positioned and held by manually tightening the holding screw after positioning with reference to the outer end surface of the screen plate.

Further, the horizontal movement operation mechanism of the print head horizontally moves the first squeegee and the second squeegee on the screen plate so that the paste supplied to the front surface of the screen plate is printed on the green sheet on the back surface of the screen plate. However, only the first squeegee is provided as the horizontal movement position detection sensor for the first squeegee and the second squeegee.
The squeegee and the second squeegee are simultaneously moved down and up on the screen plate.

[0005]

However, in the conventional screen printing apparatus, since the operator operates the holding screw each time to hold the screen plate, the workability is extremely poor. was there.

Further, the positions of the relative positioning holes formed at the four corners of the screen plate surface deviate from the field of view of the recognition camera due to variations in the positioning precision by the operator and variations in the processing precision of the screen plate frame. However, there is a problem that the work of repositioning occurs again and the screen plate cannot be positioned with high accuracy.

An object of the present invention is to provide a screen printing apparatus capable of efficiently and accurately positioning and holding a screen plate.

[0008]

In order to achieve the above object, the present invention provides a base on which a screen plate is placed, and a holding frame formed on the base and formed on the peripheral portion of the screen plate. To a reference position, a slide cylinder into which the clamp pin is inserted after moving the clamp pin on a positioning bush formed in a part of the positioned holding frame, and the holding frame in the clamp pin inserted state as the base. It is characterized in that it is provided with an air clamp that is sandwiched between the two.

[0009]

According to the above means, when the screen plate is placed on the base, its holding frame is positioned by the positioning member. In this state, when the clamp pin of the slide cylinder is moved and then inserted onto the positioning bush formed on a part of the holding frame, the screen plate is accurately positioned on the base. In this state, the holding frame is held between the base and the air clamp.

As a result, the screen plate is positioned with high accuracy. Further, since it is only necessary to give an operation signal to the slide cylinder and the air clamp, workability is improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to illustrated embodiments.

FIG. 1 is a perspective view showing an embodiment of a screen plate positioning and holding mechanism which is a main part of the present invention, FIG. 2 is a perspective view showing the structure of the screen plate, and FIG. 3 is a screen positioning bush and an air clamp. FIG. 4 is a cross-sectional view showing the insertion relationship with the pin, and FIG. 4 is a cross-sectional view taken along the line AA of FIG.

In these figures, the metal screen plate 1 has a structure in which the ends thereof are adhered to the mesh 2 and the peripheral edge of the mesh 2 is fixed to the screen holding frame 3 so that the screen plate 1 is spread horizontally. Made of Also,
Positioning holes 4 for aligning with the green sheet are formed at four corners of the screen plate 1.
The position of the green sheet is recognized by a camera (not shown), and the position of the green sheet is aligned.

Further, a positioning bush 5 is formed on the pair of holding frames 3a and 3b of the screen holding frame 3.

An air clamp pin 6 is inserted into the positioning bush 5 as shown in FIG.

When the conductive paste is printed on the green sheet using the screen plate 1, the screen plate 1 is placed on the upper surface of the base 7 as shown in FIG. The green sheet is arranged on the back surface of the base 7.

The screen holding frame 3 is provided on the upper surface of the base 7.
A positioning stopper 8 is provided for positioning the to the reference position. The positioning stopper 8 is an air cylinder 8
a is configured to be able to move back and forth in the directions indicated by arrows a and b,
When positioning the screen plate 1, the air cylinder 8a
By applying an operation signal to the holding frame 3b, the holding frame 3b is advanced, and by pressing the holding frame 3 at the tip end, the horizontal position of the screen plate 1 is fixed.

The holding frame 3a facing the holding frame 3b is constrained by the fixed stopper 9.

On the upper surface of the base 7, a slide cylinder 10 for inserting the clamp pin 6 after moving the clamp pin 6 on a positioning bush 5 formed in a part of the screen holding frame 3.
And an air clamp 11 for sandwiching the holding frame 3 with the clamp pin inserted between it and the base 7.

As shown in FIG. 4, the slide cylinder 10 has a cylinder rod 13 advanced toward the holding frames 3a, 3b, and a slide held by a slide base 14 so as to be horizontally movable in the directions c, d shown in FIG. By pressing the plate 15 in the direction of arrow d, the air clamp cylinder 16 held at the tip of the slide plate 15 is moved to the upper part of the positioning bush 5.

The air clamp pin 6 is fixed to the tip of the rod 17 of the air clamp cylinder 16, and the air clamp pin 6 is inserted into the positioning bush 5 by moving the rod 17 in the direction of arrow e. ing.

On the other hand, the air clamp 11 includes the holding frame 4
The tip end portion 11b of the cylinder rod 11a is provided in each corner and is lowered in the direction of the arrow h so that the holding frame 3 is sandwiched between the holding frame 3 and the base 7.

The operation will be described below.

First, the screen holding frame 3 to which the screen 1 is attached is placed on the base 7, and an operation signal is given to the air cylinder 8a of the positioning stopper 8. Then
The tip of the rod of the air cylinder 8a advances toward the holding frame 3b and presses the holding frame 3. As a result, the horizontal position of the screen plate 1 is fixed.

Next, when a screen automatic clamp signal is given, the cylinder rod 13 of the slide cylinder 10 advances toward the holding frames 3a, 3b, and the slide plate 15 held by the slide base 14 so as to be horizontally movable is in the direction of arrow d. By pressing the holding frames 3a and 3b against the slide plate 1
The air clamp cylinder 16 held at the tip of the No. 5 is moved to the upper part of the positioning bush 5. After this, the air clamp pin 6 held at the tip of the rod 17 of the air clamp cylinder 16 descends in the direction of the holding frames 3a, 3b, and the air clamp pin 6 is inserted into the positioning bush 5.

As a result, the screen plate 1 is positioned with high accuracy.

When an operating signal is given to the air clamp 11 in this state, the tip portion 11a thereof descends toward the holding frame 3 and holds the holding frame 3 with the base 7, and the screen plate 1 passes through the holding frame 3. Is firmly fixed on the base.

Therefore, since it is only necessary to give an operation signal to the positioning stopper 8, the slide cylinder 10 and the air clamp 11, the efficiency of the positioning work is improved,
Moreover, the screen plate 1 can be positioned with high accuracy.

FIG. 5 is a top view of the print head 22 supporting the first squeegee 20 and the second squeegee 21, and FIG. 6 is a side view.

The print head 22 is configured to be horizontally movable in the j and k directions of FIG. 5 by a ball screw 23 and an LM guide 24 which are directly connected to a horizontal movement drive source, and the first squeegee 20 is provided at a substantially central portion. Further, air cylinders 24 and 25 for independently lowering the second squeegee 21 toward the screen plate 1 are provided.

The rod 2 of the air cylinders 24, 25
A first squeegee 20 and a second squeegee 21 are attached to the tips of 6, and 27. Both ends of the first squeegee 20 and the second squeegee 21 have shafts 28, 2
9 and 30, 31 supported by air cylinders 24, 2
The rods 26 and 27 of 5 rise and descend according to the descending motion,
It is configured to descend.

The screen plate 1 includes the first squeegee 2
0 and the table 32 below the second squeegee 21. The green sheet 33 is placed between the table 32 and the screen plate 1.

The print head 22 includes a first squeegee 20,
A first horizontal position detection sensor 34 and a second horizontal position detection sensor 35 that detect the horizontal position of the second squeegee 21 are provided.

The operation of printing the conductive paste will be described below.

First, the green sheet 33 is placed on the table 32.
When a print start signal is given in a state of being placed on the upper surface of the, the horizontal movement drive source (not shown) is activated, and the rotational movement of the ball screw 22 directly connected to the horizontal movement drive source becomes the horizontal movement movement of the print head 22. Converted and print head 22
Moves in the h direction in FIG.

When the first horizontal position detecting sensor 34 reaches the position of the fixed electrode 36 in this moving process, the first horizontal position detecting sensor 34 operates and gives an operation signal to the air cylinder 24.

As a result, the first squeegee 20 of the first squeegee 20 and the second squeegee 21 in the initial state of FIG. 7A descends onto the screen plate 1 as shown in FIG. 7B.

The print head 22 is further moved horizontally, and the second
When the horizontal position detection sensor 35 reaches the position of the fixed electrode 36, the second horizontal position detection sensor 35 operates and gives an operation signal to the air cylinder 25.

As a result, the second squeegee 21 is also shown in FIG.
It descends on the screen plate 1 as shown in (c).

After that, when the print head 22 horizontally moves to the print end position of the screen plate 1 as shown in FIG. 7D, the drive signal to the air cylinder 24 is released, and FIG.
As shown in (e), the first squeegee 20 is pulled up on the screen plate 1.

Further, when the second squeegee 21 horizontally moves to the print end position of the screen plate 1 as shown in FIG. 7 (f), the drive signal to the air cylinder 25 is released, and as shown in FIG. 7 (g). Then, the first squeegee 20 is pulled up on the screen plate 1.

By the horizontal movement of the first squeegee 20 and the second squeegee 21, the conductive paste supplied to the upper surface of the screen plate 1 is printed and applied to the green sheet 33 on the back surface of the screen plate 1.

Here, when only the first horizontal position detecting sensor is provided and the first squeegee 20 and the second squeegee 21 are simultaneously lowered, the printing loss corresponding to the mounting interval of the first squeegee 20 and the second squeegee 21 is lost. Occurs, but
In this embodiment, since each squeegee is lowered independently, printing loss can be reduced.

[0044]

As described above, according to the present invention, the base on which the screen plate is placed, and the holding frame formed on the base and formed on the peripheral portion of the screen plate are positioned at the reference position. The positioning member and the air that holds the holding frame with the clamp pin inserted between the slide cylinder and the base after the clamp pin is moved over the positioning bush formed on a part of the positioned holding frame. Since the clamp is provided to hold the screen plate, the screen plate can be positioned and held efficiently and highly accurately.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a screen plate positioning and holding mechanism which is a main part of the present invention.

FIG. 2 is a perspective view showing a configuration of a screen plate.

FIG. 3 is a sectional view showing an insertion relationship between a screen positioning bush and an air clamp pin.

FIG. 4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a top view showing a configuration of a horizontal movement mechanism of the print head.

FIG. 6 is a side view showing the configuration of a horizontal movement mechanism of the print head.

FIG. 7: Lowering of the squeegee attached to the print head,
It is explanatory drawing of a raising operation.

[Explanation of symbols]

1 ... Screen plate, 2 ... Mesh, 3 ... Screen holding frame, 5 ... Screen positioning bush, 6 ... Air clamp pin, 7 ... Base, 8 ... Positioning stopper, 10 ...
Slide cylinder, 11 ... Air clamp, 14 ... Slide base, 16 ... Air clamp cylinder, 20 ... First
Squeegee, 21 ... Second squeegee, 22 ... Print head, 3
2 ... table, 33 ... green sheet.

Claims (1)

[Claims] 1. A squeegee supported by a print head having a horizontal movement drive source, a screen plate placed on a paste application surface of a green sheet, and an air cylinder for advancing the squeegee toward the screen plate. In a screen printing apparatus for printing the paste supplied to the screen plate surface on a green sheet on the back surface of the screen plate by horizontally moving the print head in a state where the squeegee is pressed against the screen plate surface by the air cylinder. A base on which the screen plate is placed, a positioning member that is formed on the base and positions the holding frame formed on the peripheral portion of the screen plate at a reference position, and a part of the positioned holding frame. Slide cylinder to insert after moving the clamp pin on the formed positioning bush Screen printing apparatus characterized by comprising an air clamp for clamping between the base of the holding frame of the clamp pin inserted state.