JPH0858059A - Screen printer - Google Patents

Abstract

PURPOSE: To print in a wide area of a matter to be printed with a high resolution. CONSTITUTION: In a screen printer 1 which moves a squeegee 5 from the one end side to the other end side of a screen 3 disposed on a matter 4 to be printed and coats the matter 4 to be printed, pressing members 7 for pressing the screen 3 are provided near both the ends of the squeegee 5.

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 for moving a squeegee from one end side to the other end side of a screen arranged on a printing material to apply a thick film paste onto the printing material.

[0002]

2. Description of the Related Art In a conventional screen printing machine 1, as shown in FIG. 6, a screen 3 stretched on a frame 2 having a rectangular frame shape is predetermined on a material to be printed 4 such as a ceramic substrate constituting a hybrid IC. Are arranged with a space of from the one end 3a side of the screen 3 to the other end 3 of the screen 3.
The squeegee rubber 5a attached to the lower end side of the squeegee 5 is moved to the side b with a constant pressing force (hereinafter referred to as squeegee pressure), and the thick film paste 6 supplied onto the screen 3 is applied onto the substrate 4 to be printed, A predetermined pattern is printed.

[0003]

However, in such a conventional screen printing machine 1, as shown in FIG. 7, the squeegee rubber 5a of the squeegee 5 abuts the screen 3 to apply a constant squeegee pressure A to each part. Frame 2
Since the tension B of the screen 3 stretched over the area is larger as it is closer to the frame 2, the actual pressing force C (hereinafter referred to as the printing effective pressure C) applied to the printing object 4 is smaller than that near the center of the lower edge of the squeegee rubber 5a. It becomes smaller near both ends.

Further, as shown in FIG. 8, from the one end 3a side of the screen 3 which is the starting point side of the movement of the squeegee 5 to the other end 3 of the screen 3 which is the ending point side of the movement of the squeegee 5.
Even when the squeegee 5 is moved to the side b at a constant squeegee pressure A, since the tension B of the screen 3 is large near the one end side and the other end side of the screen 3 close to the frame 2, the effective printing pressure C is the squeegee 5. The squeegee rubber 5a becomes smaller on the start point side and the end point side than in the vicinity of the middle of movement.

Therefore, there is a problem that the thickness of the thick film paste 6 applied to the printed material 4 is smaller in the vicinity of the edge portion than in the vicinity of the central portion.

Therefore, a main object of the present invention is to provide a screen printing machine capable of performing high-resolution printing over a wide area of a printed material by providing pressing members for pressing the screen near both ends of the squeegee. That is.

[0007]

In order to achieve the above-mentioned object, the present invention provides a thick film on a printed material by moving a squeegee from one end side to the other end side of a screen arranged on the printed material. In the screen printing machine for applying the paste, a pressing member for pressing the screen toward the printed material is provided near both ends of the squeegee.

Further, the pressing member is provided with an adjusting means for positioning in the height direction with respect to the screen, or with a spring portion capable of contracting in the height direction.

Further, the front end of the pressing member on the screen side is spherical, sled-shaped, or roller-shaped.

[0010]

According to the above structure, the pressing members provided near both ends of the squeegee press the screen toward the object to be printed, thereby depressing the tension of the screen between the pressing parts and performing a certain printing on the object to be printed. Pressure can be applied.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a screen printing machine according to the present invention will be described below with reference to the drawings. It should be noted that the same or equivalent parts as those of the conventional example are denoted by the same reference numerals and the description thereof will be omitted.

The present invention is characterized in that pressing members for pressing the screen 3 are provided near both ends of the squeegee 5.

In FIG. 1, reference numeral 7 is a pressing member made of a substantially cylindrical metal material or the like, which is attached to both ends of the squeegee 5 via connecting portions 8 so that its central axis is perpendicular to the surface of the screen 3. ing. In this case, the tip end portions of the pressing members 7, 7 on the screen 3 side are processed into a spherical shape, and are positioned so as to be at the same height as the lower edge portion of the squeegee rubber 5a.

In the above embodiment, the pressing members 7, 7 having a substantially cylindrical shape have been described, but the shape of the pressing members 7, 7 is not limited to the substantially cylindrical shape, and may be another shape such as a prismatic shape. Good.
Further, the tip end portions of the pressing members 7, 7 on the screen 3 side are processed into a spherical surface with less friction so as to slide on the screen 3 in conjunction with the squeegee 5, but as shown in FIG. 7 may be provided with a sled portion 11 at the tip end on the screen 3 side to increase the area in contact with the screen 3 to reduce friction with the screen 3 and suppress deterioration of the screen 3. As shown in
By providing the roller portion 12, the roller portion 12 may be rotated to eliminate friction with the screen 3 and suppress deterioration of the screen 3.

Further, the material of the pressing members 7, 7 is a metal material, but the material is not limited to the metal material, and other materials such as an elastic material and a plastic material may be used depending on the shape of the pressing members 7, 7 and the material of the screen 3. Materials may be used.

Further, when the squeegee rubber 5a of the squeegee 5 needs to be repositioned so that the lower tips of the pressing members 7 and 7 are at the same height as the lower edge of the squeegee rubber 5a, for example, when the squeegee rubber 5a is replaced. As shown in FIG. 4, a height adjustment capable of adjusting the vertical movement of the rotating shaft in units of 0.01 mm at the minimum scale by rotating the upper ends of the pressing members 7 and 7 with a precise screw such as used in a micrometer. It is convenient to provide the means 13. Further, as shown in FIG. 5, by providing the spring portion 14 at the upper tip end portion of the pressing members 7 and 7, this causes variation in height between the lower tip end portions of the pressing members 7 and 7 and the lower edge portion of the squeegee rubber 5a. It may be structured to absorb.

The screen printing machine 1 configured as described above
Then, when the squeegee rubber 5a of the squeegee 5 is brought into contact with the screen 3 and a constant squeegee pressure A is applied, at the same time, the pressing members 7, 7 attached to both ends of the squeegee 5 press the screen 3, and the space between the pressing members 7, 7 is increased. Since the tension B of the screen 3 is deenergized, the tension B of the screen 3 is not applied to the squeegee rubber 5a, and the effective printing pressure C is constant in each part of the substrate 4.

Further, when the squeegee rubber 5a of the squeegee 5 is moved from the one end 3a side of the screen 3 to the other end 3b side, the screen 3 is near the one end 3a side and the other end 3b side of the screen 3 close to the frame 2. Although the tension B becomes large, the pressing members 7 and 7 press the screen 3 and depress the tension B of the screen 3 between the pressing members 7 and 7, so that the tension B of the screen 3 is not applied to the squeegee rubber 5a. The effective printing pressure C is constant at each position where the squeegee 5 moves.

Therefore, the effective printing pressure C is equal to
Is constant in all parts, and the film thickness of the thick film paste 6 applied to the printing object 4 is also uniform.

[0020]

As described above, according to the screen printing machine of the present invention, the pressing members provided in the vicinity of both ends of the squeegee press the screen to cancel the tension of the screen between the pressing members. The squeegee rubber of the squeegee applies a certain print execution pressure to the printing material, and can perform high-resolution printing over a wide area of the printing material.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a screen printing machine according to an embodiment of the present invention.

FIG. 2A is a front view of relevant parts showing a state in which a sled portion is provided on a lower end of a pressing member, and FIG. 2B is a side view of relevant parts.

FIG. 2A is a front view of relevant parts showing a state in which a roller portion is provided at a lower end of a pressing member, and FIG. 2B is a side view of relevant components.

FIG. 4 is a side view of an essential part showing a state in which height adjusting means is provided on the upper end of the pressing member.

FIG. 5 is a cross-sectional view of essential parts showing a state where a spring portion is provided at the upper end of the pressing member.

FIG. 6 is a cross-sectional view of a main part of a conventional screen printing machine.

FIG. 7 is a cross-sectional view of relevant parts showing a state in which a squeegee rubber of a squeegee of a conventional screen printing machine is in contact with a screen.

FIG. 8 is a cross-sectional view of essential parts showing changes in squeegee pressure, screen tension, and printing execution pressure between the start point and the end point of movement of the squeegee of the conventional screen printing machine.

[Explanation of symbols]

 1 Screen printing machine 3 Screen 4 Printed material 5 Squeegee 7 Pressing member

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 2, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a screen printing machine according to an embodiment of the present invention.

FIG. 2A is a front view of relevant parts showing a state in which a sled portion is provided on a lower end of a pressing member, and FIG. 2B is a side view of relevant parts.

FIG. 3A is a front view of relevant parts showing a state in which a roller portion is provided at a lower end of a pressing member, and FIG. 3B is a side view of relevant components.

FIG. 4 is a side view of an essential part showing a state in which height adjusting means is provided on the upper end of the pressing member.

FIG. 5 is a cross-sectional view of essential parts showing a state where a spring portion is provided at the upper end of the pressing member.

FIG. 6 is a cross-sectional view of a main part of a conventional screen printing machine.

FIG. 7 is a cross-sectional view of relevant parts showing a state in which a squeegee rubber of a squeegee of a conventional screen printing machine is in contact with a screen.

FIG. 8 is a cross-sectional view of essential parts showing changes in squeegee pressure, screen tension, and printing execution pressure between the start point and the end point of movement of the squeegee of the conventional screen printing machine.

[Explanation of reference numerals] 1 screen printing machine 3 screen 4 printed material 5 squeegee 7 pressing member

Claims (6)

[Claims] 1. A screen printing machine for moving a squeegee from one end side to the other end side of a screen arranged on a material to be printed to apply a thick film paste on the material to be printed, in the vicinity of both ends of the squeegee. A screen printing machine comprising a pressing member for pressing the screen toward the printed material. 2. The screen printing machine according to claim 1, wherein the pressing member is provided with adjusting means for positioning in the height direction with respect to the screen. 3. The screen printing machine according to claim 1, wherein the pressing member is provided with a spring portion which can be contracted in a height direction with respect to the screen. 4. The screen printing machine according to claim 2, wherein the tip end of the pressing member on the screen side is spherical. 5. A sled shape is formed at the tip of the pressing member on the screen side.
Screen printing machine described. 6. The screen printing machine according to claim 2, wherein a tip portion of the pressing member on the screen side has a roller shape.