JPH07178887A - Printing apparatus - Google Patents

Abstract

PURPOSE:To execute printing satisfactorily without blurring even in the case where fine patterns are printed. CONSTITUTION:A printed board 3 is brought into contact with the underside of a printing mask 1 that is equipped with an opening for printing, and a squeegee 36 is moved in the direction Y along the surface of the mask 1 and printing is made on the printed board 3 with solder paste supplied to the surface of the printing mask 1 squeezed onto the printed board 3 through the opening of the printing mask 1. The printing apparatus as mentioned above is equipped with a first driving cylinder 40 that lowers the squeegee 36 for touching the surface of the printing mask with a specified pressure and is equipped with a control device 43 that controls the amount of descent for the squeegee 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus for performing screen printing, for example, a printing apparatus for printing solder paste on each electrode pad of a wiring pattern on a printed circuit board. .

[0002]

2. Description of the Related Art For example, a large number of electronic components may be surface-mounted on a printed circuit board by soldering. In such a case, a reflow soldering method is generally used, which is capable of soldering a large number of electronic components collectively.

This reflow soldering is carried out in advance on each electrode pad of the wiring pattern of the printed circuit board.
Stroke-shaped solder (hereinafter referred to as "solder paste") is supplied, and the electronic component is placed on the printed circuit board so as to face the terminals of the electronic component and the electrode pads (solder paste). Place it.

When all the electronic components are mounted on the printed circuit board, the printed circuit board together with the electronic components is inserted into the reflow oven. With this, the solder paste
The strike melts and the electronic components are collectively surface-mounted on the printed circuit board.

In order to perform such reflow soldering with high accuracy, the solder paste is placed on each electrode pad of the wiring pattern, especially when the electrode pads are provided at a fine pitch. Need to be supplied to

As described above, there is a screen printing method as a method for accurately supplying the solder paste onto the printed circuit board. This screen printing is performed, for example, as shown in FIG.

Reference numeral 1 in the figure denotes a printing mask (hereinafter referred to as "mask").
That is). The mask 1 is formed by providing a screen-shaped thin plate with openings 1a ... Corresponding to each wiring pattern of the printed circuit board. The edge portion of the mask 1 is held by the frame member 2.

At the time of printing, the mask 1 is placed on the upper surface of the printed circuit board 2 shown by the dotted line in the figure. A squeegee indicated by 3 in the figure is elastically brought into contact with the upper surface of the mask 2, and the solder paste 4 supplied onto the mask 1 by the squeegee 2 is indicated by an arrow (a) in the figure. Move in the direction indicated by. As a result, each opening 1a of the mask 1 ...
Solder paste 4 is pushed into the box in sequence.

When the mask 1 is separated from the printed board 2, the solder paste 5 pushed into the opening 1a is transferred onto the electrode pad of the printed board 2.

[0010]

By the way, the conventional printing apparatus has the following problems to be solved. First
In addition, the printing state changes depending on the shape of the opening 1a formed in the mask 1.

For example, with respect to the advancing direction of the squeegee 3, between the vertically long opening 1a and the horizontally long opening 1a, the horizontally long opening 1a takes less time for the squeegee 3 to pass.
As a result, it may happen that the horizontally long opening 1a is more likely to be blurred than the vertically long opening 1a.

Second, there is a limit to the cleaning of the mask 3. In recent years, the openings 1a provided in the mask 1 have become finer and finer as the number of terminals of the electronic component has become narrower and the electronic components have been mounted at a higher density. Therefore, it is difficult to clean and remove the solder paste 5 clogged in the opening 1a of the mask 1, which causes blurring.

Thirdly, the mask 1 may be damaged. In order to prevent the solder paste 5 from being scratched, it is necessary to increase the printing pressure of the squeegee 3 in order to effectively push the solder paste into the fine opening 1a. However, in the run-up portion where the printed circuit board 3 is not located on the lower surface of the mask 1, the mask 1 may be pushed down too much and the mask 1 may be damaged.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a printing apparatus capable of performing excellent printing without causing blurring.

[0015]

According to a first aspect of the present invention, a substrate is relatively positioned on one surface side of a printing mask provided with an opening, and the substrate is aligned along the other surface of the printing mask. By moving the squeegee, the paste supplied to the other surface of the printing mask is pushed out from the opening of the printing mask to the other surface of the substrate, and the paste is printed on the substrate. In the printing apparatus, a driving mechanism for bringing the squeegee into contact with the other surface of the printing mask at a predetermined pressure, and a control means provided in the driving mechanism for controlling the driving amount of the squeegee. A printing device characterized by the above.

The second means is the printing apparatus of the first means, and the control means controls the one surface of the mask when the squeegee moves along the other surface of the printing mask. It is characterized in that the drive amount of the squeegee is changed depending on whether the substrate is located on the side or not.

A third means is to relatively position the substrate on one surface side of the printing mask provided with the opening and move the squeegee along the other surface of the printing mask. In the printing apparatus, the paste supplied to the other surface of the printing mask is extruded from the opening of the printing mask to the other surface of the substrate, and the paste is printed on the substrate. Is a squeegee body whose one end is brought into contact with the other surface of the substrate and moves in a predetermined direction, and a squeegee body oscillates in a direction orthogonal to the moving direction of the squeegee body in the moving direction front surface. An oscillating body which is movably provided and oscillates to oscillate the paste supplied to the front surface side of the squeegee body in a direction orthogonal to the moving direction of the squeegee body. It is characterized by doing.

A fourth means is to relatively position the substrate on one surface side of the printing mask provided with an opening and move the squeegee along the other surface of the printing mask. In the printing apparatus for extruding the paste supplied to the other surface of the printing mask from the opening of the printing mask to the other surface of the substrate and printing the paste on the substrate, An air supply unit located on the other surface side, which blows away the paste clogged in the opening of the printing mask by supplying air to the other surface of the printing mask, and one surface side of the printing mask. And a suction means for sucking the paste blown off by the air supply means.

A fifth means is to relatively position the substrate on one surface side of the printing mask provided with an opening and move the squeegee along the other surface of the printing mask. In the printing apparatus, the paste supplied to the other surface of the printing mask is extruded from the opening of the printing mask onto the other surface of the substrate, and the paste is printed on the substrate. The printing apparatus comprises a brush mechanism that comes into contact with one surface of the printing mask and scrapes out the paste clogged in the opening of the printing mask.

[0020]

According to the first and second means, the descending amount of the squeegee can be regulated to effectively prevent the printing mask from being excessively deformed. According to the third means, not only the paste supplied onto the printing mask is moved in the moving direction of the squeegee, but also in the direction orthogonal to the moving direction of the squeegee. Therefore, it is possible to perform excellent printing of the above-mentioned paste.

According to the fourth means, it is possible to satisfactorily remove the paste stuck in the opening of the printing mask. According to the fifth means, it is possible to satisfactorily remove the paste stuck in the opening of the printing mask.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Regarding the same components as the conventional example,
The same reference numerals are given and the description thereof is omitted. In the figure, 10 is a frame of this printing apparatus. On the pedestal 10, the printing portion 11 for printing the solder paste 5 (paste) on the printed circuit board 3 and the solder paste 5 attached to the printing mask 1 (hereinafter referred to as "mask") are washed and removed. Clear
The ning portion 12 is continuously provided in the X direction.

First, the printing section 11 will be described.
The printing unit 11 is provided with a printed circuit board supply device 9 that supplies the printed circuit board 3. The printed circuit board supply device 9 includes a Y guide rail 13 fixed on the pedestal 10 and a movable body 14 slidably held in the Y guide rail 13 in the Y direction (direction orthogonal to the paper surface). A ball screw mechanism 15 provided on the Y guide rail 13 for positioning and moving the moving body 14 in the Y direction.
And. A holding table 16 is provided on the upper surface of the moving body 14 for holding the printed circuit board 3 substantially horizontally on the upper surface thereof and driving it upward.

That is, this printed circuit board supply device 9
Allows the printed circuit board 3 to be conveyed in the Y direction and stopped at a predetermined position, and the printed circuit board 3 can be lifted and driven at that position.

On the other hand, above the printing unit 11 and the above-mentioned clear.
An X guide rail 35 that is long in the X direction is installed substantially horizontally above the turning portion 12. The X guide rail 35 is provided with a moving portion 37 for holding the mask 1 and a squeegee shown in FIG. 36 so as to be slidable in the X direction. The moving portion 37 is slidably attached to the X guide rail 35 and holds the mask 1 in a substantially horizontal direction, and a Y is provided on the upper surface of the holder 38.
And a gate-shaped frame 39 slidably provided in the direction (direction orthogonal to the paper surface).

On the upper surface of the upper end horizontal portion 39a of the frame 39, the axis is vertical, and the drive shaft 40a is projected from the lower surface of the upper end horizontal portion 39a. Mechanism) is attached. A strip plate-shaped squeegee 36 whose longitudinal direction is parallel to the X direction is fixed to the lower end of the drive shaft 40a of the first drive cylinder 40.

A pair of guide posts 41 are vertically provided on the upper end surfaces of both longitudinal ends of the squeegee 36 so as to vertically slide through the upper end horizontal portion 39a of the frame 39. There is. The pair of guide posts 41 extend higher than the upper surface of the first drive cylinder 40, and a plate-shaped stopper 42 is installed on the upper end in a substantially horizontal manner.

Further, between the stopper 42 and the upper surface of the first drive cylinder 40, a regulating means 43 for regulating the descending amount of the squeegee 36 is provided. The restricting means 43 is screwed onto the stopper 42, and the lower end of the bolt 4 is protruded from the lower surface of the stopper 42 by a predetermined amount.
4 and a direct drive type second drive cylinder 45 fixed to the upper surface of the drive cylinder 40 with the axis line horizontal,
A cam 46 having a right-angled triangular cross section, which is provided on the drive shaft 45a of the second drive cylinder 45 and is driven forward and backward in a direction facing the lower surface of the bolt 44, is formed.

That is, the lower end of the bolt 44 is brought into contact with the inclined surface of the cam 46, so that the squeegee 36 passes through the stopper 42 and the guide post 41.
Is regulated. Further, the second drive cylinder 45 drives the cam 46,
By changing the position of the inclined surface with which the bolt 44 abuts, the descending amount of the squeegee 36 is controlled. The second drive cylinder 45 is shown in FIG.
It is connected to the control unit indicated by.

Next, the structure of the squeegee 36 will be described. As shown in FIGS. 1 and 3 (b), the squeegee 36 includes a strip plate-shaped squeegee body 48 and the squeegee 36.
A swing drive section 49 attached to the upper part of the front surface of the main body 48 in the traveling direction, and a swinging body 50 connected to the swing drive section 49 and swingably driven on the front surface of the main body 48 in the traveling direction. It is equipped with.

This rocking body 50 is the squeegee body 48.
An inclined portion 50a which is formed in a smaller strip plate shape and is inclined at the lower end toward the lower end of the rocking body 50, and a partition plate 5 which partitions the inclined portion 50a in the X direction at predetermined intervals.
0b ... And are provided.

That is, this squeegee 36 is
As shown in (b), when the solder paste 5 is applied onto the mask 1, the solder paste 5 is inserted into the slope portion 50a partitioned by the partition plates 50b ... The solder paste 5 above
It can be swung in any direction.

Next, the cleaning section will be described. As shown in FIGS. 1 and 2, the cleaning unit 12 includes a first cleaning device indicated by 18 and a second cleaning device indicated by 19.

The first cleaning device 18 is located above the X guide rail 35 and is located above the X guide rail 35.
An air supply nozzle 20 for blowing gas onto the upper surface of the mask 1 conveyed along the mask 35 to blow away the solder paste clogged in the opening 1a of the mask 1 and the X guide rail 35. The suction nozzle 21 sucks the solder paste 5 blown off from the opening 1a of the mask 1 by the air supply nozzle 20.

The second cleaning device 19 includes a base 22 fixed on the mount 10 and the base 2.
2 and the opening 1a of the mask 1 is brought into contact with the lower surface of the mask 1 which is conveyed along the X guide rail 35.
Brush 25 for scraping the solder paste 5 stuck inside
And a wiping portion 26 which is also provided on the base 22 and wipes off the solder paste 5 attached to the lower surface of the mask 1.

The brush 25 is, as shown in FIG. 2, a swing plate 27 which is swingably provided on the upper surface of the base 22.
It is provided so as to be rotationally driven around a horizontal axis by a motor 28 fixed above. And this brush 2
5 is configured to perform the above-mentioned operation by being rotationally driven and rockingly driven.

Further, the wiping portion 26 stores a sheet 30 for wiping, which is wound up and is sequentially fed out.
And a take-up roll 32 for taking up the sheet 30. Between the pay-out roll 31 and the take-up roll 32,
A contact piece 33 for pressing the sheet 30 delivered from the delivery roll 31 against the lower surface of the mask 1 is provided in a protruding manner.

Next, the printing operation of this printing apparatus will be described. First, the moving unit 37 is driven in the X direction to move the mask 1 and the squeegee 36 to the printing unit 1.
Stop above 1. Then, the substrate supply device is operated to position the printed circuit board 3 below the mask 1.

As shown in FIG. 4 (a), when the printed circuit board 3 is positioned below the mask 1, the printed circuit board 3 is driven to rise and contacts the lower surface of the mask 1.

Then, the squeegee 36 is driven in the Y direction to push the solder paste 5 into the opening 1a of the mask 1 as shown in FIG. At this time, as shown in FIG. 3B, the rocking body 50 is rockingly driven to rock the solder paste 5. With this,
Since the solder paste 5 is driven not only in the Y direction but also in the X direction, the solder paste 5 is pushed in substantially uniformly regardless of the size and shape of the opening 1a.

At this time, the amount of lowering of the squeegee 36 is changed between the position A where the printed circuit board 3 is absent and the position B shown in FIG. 4B. That is, the squeegee 36 is driven downward by the first drive cylinder 40, and the lower end of the squeegee 36 is elastically brought into contact with the upper surface of the mask 1 to move the paste 5 to the opening 1 of the mask 1.
Although it is pushed into the inside a, at the position A where the printed circuit board 3 is not present, the mask 1 may be pushed down too much and the mask 1 may be damaged.

For example, the mask 1 has a thickness of 100 to 150.
It is a thin plate made of stainless steel having a thickness of μm and the pressing force of the squeegee 36 is 10 Kg. However, there is a large possibility that the mask 1 will be greatly distorted and the mask 1 will be damaged.

Therefore, the control section 47 of the regulating means 43.
In the position A where the printed circuit board 3 is not present (as shown in FIG. 1), the cam 46 is driven to project by the first cylinder 40, and the height of the slope contacting the bolt 44 is lowered to reduce the skiing. Decrease the descending amount of J 36. Then, at the position B where the printed circuit board 3 is located, the cam 46 is driven to be retracted to increase the height of the slope on which the bolt 44 abuts to increase the descending amount of the squeegee 36.

When the squeegee 36 is moved along the upper surface of the mask 1 by such an operation, the printed board 3 is lowered to separate the mask 1 from the printed board 3. As a result, the solder paste 5 is transfer-printed on the electrode pads of the printed circuit board 3.

When the printing of the solder paste 5 on one printed circuit board 3 is completed, the printed circuit board transporting device 9 ejects the printed circuit board in the Y direction and a new printed circuit board 3 is masked. Supply to the lower side of 1. Then, the printing apparatus prints the solder paste 5 on the new printed circuit board 3 by the above-described operation.

When the printing is completed a predetermined number of times, this printing apparatus moves the frame 39 to one end of the holding body 38 in the Y direction, and then moves the moving section 37 to the cleaning section 12. Is driven in the direction (X direction) provided with. As a result, the mask 1 is transferred to the cleaning section 12 and, as shown in FIG.
Then, the second cleaning portion 19 is sequentially passed.

In the first cleaning section 18, a gas having a predetermined pressure is blown from the air feeding nozzle 20 onto the upper surface of the mask 1 to blow off the solder paste 5 which is clogged in the opening 1a of the mask 1. The blown-off solder paste 5 is sucked by the suction nozzle 21.

In the second cleaning portion 19, first, the solder paste 5 in the opening 1a of the mask 1 is scraped out by the brush 25 which is rotationally driven and rockingly driven, and then this. The solder paste 5 attached to the lower surface of the mask 1 is wiped off.

Such a cleaning operation is performed by reciprocating the mask 1 with the first and second cleaning portions 18 and 19 at least twice.

When the cleaning is completed, the moving unit 37 moves again above the printing unit 11 to continuously print the solder paste 5 on the printed circuit board 3.

According to this structure, the following effects can be obtained. First, when the squeegee 36 is driven, the descending amount of the squeegee 36 is changed between the position A where the printed circuit board 3 is not present and the certain position B.

This effectively prevents the mask 1 from being excessively deformed and damaged.
Secondly, by providing the swing body 50 on the squeegee 36, in addition to moving the solder paste 5 in the Y direction, which is the moving direction of the squeegee 36, the squeegee 36 also moves. It can also be swung in the X direction orthogonal to the direction.

As a result, the opening 1a of the mask 1 is formed.
The solder paste 5 can be pushed into the inside substantially uniformly. Further, it does not prevent the rolling (rolling) of the solder paste 5 required for good printing, while the squeegee 36 is moved in the Y direction only. Since the strike 5 can be moved in the X direction and the Y direction, it is possible to obtain further effects with a simpler configuration than a printing apparatus having a squeegee mechanism that moves in the X direction and the Y direction.

Thirdly, in the first cleaning device 18, gas is blown from above and the solder paste 5 blown off below is sucked. This has the effect of enabling better cleaning.

That is, in the conventional cleaning device,
Only the opening 1a of the mask 1 was sucked from below. However, in this case, when the opening 1a of the mask 1 is miniaturized due to the recent narrowing of the number of terminals of the semiconductor element, effective cleaning may not be performed.

However, such a structure has an effect that effective cleaning can be performed even if the opening 1a of the mask 1 is further miniaturized. Fourthly, in the second cleaning device 19, the brush 25 is used to open the opening 1a.
After scraping out the solder paste 5 stuck inside, the wiping means 26 wipes off the solder paste 5 attached to the lower surface of the mask 1. This has the effect of better cleaning the mask 1.

Due to these first to fourth effects, it is possible to obtain a printing apparatus capable of performing excellent printing with less blur even when performing fine printing of solder paste.

The present invention is not limited to the above-mentioned embodiment, but can be variously modified without changing the gist of the invention. For example, in the above-described embodiment, the regulating means 43 for regulating the descending amount of the squeegee 36 is the second means.
The cylinder 45 and the bolt 44 are used, but the invention is not limited to this.

For example, the second cylinder 45 and the bolt 44 may not be provided, and the moving amount of the first cylinder 40 may be directly controlled to control the lowering amount of the squeegee 36. Further, instead of the first cylinder 40,
The squeegee 36 may be driven downward by using a direct drive type servo motor or a pulse motor.

In these cases, the area A where the printed circuit board 3 is not located and the area B where the printed circuit board 3 is located on the lower surface side of the mask 1 are input in advance to the control unit, and the frame is printed.
The descending amount of the squeegee 36 is controlled according to the movement of the frame 39. Even in this case, it is possible to obtain substantially the same effect as that of the above-mentioned embodiment.

Further, in the above-mentioned one embodiment, the printing apparatus of the solder paste used for the reflow soldering is shown as the printing apparatus, but the printing apparatus is not limited to this, and the screen printing is used for other purposes. It may be a printing device that performs printing. Therefore, although the solder paste is used as the paste in the above-described embodiment, it may be ink, for example.

[0062]

According to the first aspect of the present invention, the substrate is relatively positioned on one surface side of the printing mask provided with the opening, and the squeegee is arranged along the other surface of the printing mask. By moving the paste supplied to the other surface of the printing mask to the other surface of the substrate through the opening of the printing mask, in a printing device for printing the paste on the substrate. A drive mechanism for bringing the squeegee into contact with the other surface of the print mask at a predetermined pressure, and a control means provided in the drive mechanism for controlling the drive amount of the squeegee. Printing device.

According to a second configuration, in the printing apparatus of the first configuration, the control means causes the squeegee to move along the other surface of the printing mask when one surface of the mask is moved. It is characterized in that the drive amount of the squeegee is changed depending on whether the substrate is located on the side or not.

In the third structure, the substrate is relatively positioned on one surface side of the printing mask provided with the opening, and the squeegee is moved along the other surface of the printing mask. In the printing apparatus, the paste supplied to the other surface of the printing mask is extruded from the opening of the printing mask to the other surface of the substrate, and the paste is printed on the substrate. Is a squeegee body whose one end is brought into contact with the other surface of the substrate and moves in a predetermined direction, and a squeegee body oscillates in a direction orthogonal to the moving direction of the squeegee body in the moving direction front surface. An oscillating body which is movably provided and oscillates to oscillate the paste supplied to the front surface side of the squeegee body in a direction orthogonal to the moving direction of the squeegee body. It is characterized by doing.

In the fourth structure, the substrate is relatively positioned on one surface side of the printing mask provided with the opening, and the squeegee is moved along the other surface of the printing mask. In the printing apparatus for extruding the paste supplied to the other surface of the printing mask from the opening of the printing mask to the other surface of the substrate and printing the paste on the substrate, An air supply unit located on the other surface side, which blows away the paste clogged in the opening of the printing mask by supplying air to the other surface of the printing mask, and one surface side of the printing mask. And a suction means for sucking the paste blown off by the air supply means.

In the fifth structure, the substrate is relatively positioned on one surface side of the printing mask provided with the opening, and the squeegee is moved along the other surface of the printing mask. In the printing apparatus, the paste supplied to the other surface of the printing mask is extruded from the opening of the printing mask onto the other surface of the substrate, and the paste is printed on the substrate. The printing apparatus comprises a brush mechanism that comes into contact with one surface of the printing mask and scrapes out the paste clogged in the opening of the printing mask.

According to such a configuration, there is an effect that it is possible to provide a printing apparatus capable of performing excellent printing without causing blurring even when printing a fine pattern.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a part of the same in an enlarged manner.

3A and 3B are process diagrams showing a printing process.

FIG. 4A is a perspective view showing screen printing, and FIG.
Is also a side view.

FIG. 5 is a perspective view showing a general screen printing process.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mask (mask for printing), 1a ... Opening, 3 ... Printed circuit board (substrate), 5 ... Solder paste (paste), 3
6 ... Squeegee, 43 ... Regulation means (control means), 20 ... Air supply nozzle (air supply means), 21 ... Suction nozzle (suction means), 25 ... Brush (brush mechanism), 48 ... Squeegee body, 50 ... an oscillating body.

Claims (5)

[Claims] 1. A printing mask provided with an opening is relatively positioned on one surface side of the printing mask, and a squeegee is moved along the other surface of the printing mask to print the printing mask. In a printing apparatus for extruding the paste supplied to the other surface of the mask from the opening of the printing mask to the other surface of the substrate, and printing the paste on the substrate, the squeegee is applied to the printing mask. A printing apparatus comprising: a drive mechanism for contacting the other surface of the drive unit at a predetermined pressure; and a control unit provided in the drive mechanism for controlling the drive amount of the squeegee. 2. A printing apparatus according to claim 1, wherein said control means is such that when said squeegee moves along the other surface of the printing mask, the substrate is placed on one surface side of this mask. A printing apparatus, wherein the drive amount of the squeegee by the drive mechanism is changed depending on whether the drive mechanism is located or not. 3. A printing mask provided with an opening is relatively positioned on one surface side of the printing mask, and a squeegee is moved along the other surface of the printing mask to print the printing mask. In a printing apparatus that extrudes the paste supplied to the other surface of the mask from the opening of the printing mask to the other surface of the substrate, and prints this paste on the substrate, the squeegee has one end. A squeegee body which is brought into contact with the other surface of the substrate and moves in a predetermined direction, and a squeegee body which is swingable in a direction orthogonal to the moving direction of the squeegee body on the front side in the moving direction of the squeegee body. And a swinging body that swings the paste supplied to the front surface side of the squeegee body in a direction orthogonal to the moving direction of the squeegee body. And printing device. 4. A printing mask provided with an opening is relatively positioned on one surface side of the printing mask, and a squeegee is moved along the other surface of the printing mask to print the printing mask. In a printing device that pushes the paste supplied to the other surface of the mask through the opening of the printing mask onto the other surface of the substrate and prints this paste on the substrate, the other surface side of the printing mask. Located on the one side of the printing mask, and an air feeding means for blowing away the paste clogged in the opening of the printing mask by feeding the other side of the printing mask. A printing device comprising: suction means for sucking the paste blown off by the air supply means. 5. A printing mask provided with an opening is relatively positioned on one surface side of the printing mask, and a squeegee is moved along the other surface of the printing mask. In a printing device for extruding the paste supplied to the other surface of the mask from the opening of the printing mask to the other surface of the substrate, and printing the paste on the substrate, one surface of the printing mask. A printing apparatus comprising: a brush mechanism that comes into contact with the surface of the printing mask and scrapes out the paste clogged in the opening of the printing mask.