JPH05193124A - Cleaning device for screen mask - Google Patents

Abstract

PURPOSE:To effectively wash off cream solder stuck to brims of pattern openings provided to a screen mask. CONSTITUTION:The subject device of an air blowing part 31 which blows air sent under pressure from an air pressure device 50 onto the surface of a screen mask 1, a suction part 13 which is provided beneath the screen mask 1 and sucks, by vacuum pressure provided by an air suction device 51, cream solder 7' in pattern openings 6 opened to the screen mask 1 and a reciprocating movement means 34 which moves the air blowing part 31 and the air suction part 13 in horizontal reciprocation along the screen mask 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen mask cleaning device, and more particularly to a device for effectively cleaning cream solder adhering to the edges of pattern holes in a screen mask.

[0002]

Prior to mounting electronic parts such as ICs, LSIs, capacitor chips and resistor chips on a substrate,
A screen printing machine applies cream solder to the electrodes of the substrate. The screen mask of the screen printer is
A pattern hole is formed at an application position of the cream solder, and the cream solder is applied through the pattern hole by sliding a squeegee on the screen mask.

At this time, part of the cream solder leaks from the pattern hole to the back side of the screen mask and adheres to the back side. When the adhered cream solder is transferred to the substrate, it causes a short circuit or the like. Therefore, the back surface of the screen mask is regularly or appropriately cleaned by a cleaning device.

FIG. 6 is a side view of a conventional cleaning device. A soft tape-shaped paper 10 is attached to a roll 101.
2 is wound and this paper 102 is used as a screen mask 1
By sliding along the back surface of 03, the cream solder 105 leaked from the pattern hole 104 to the back surface was wiped off.

[0005]

However, with such a paper 102, only the cream solder 105 leaking from the pattern hole 104 to the back side can be wiped off, and the cream solder attached to the edge of the pattern hole 104. 1
05 'cannot be removed by cleaning, and as a result of the cream solder 105' remaining on the edge of the pattern hole 104, the effective opening area of the pattern hole 104 gradually becomes smaller, and the amount of cream solder 105 'applied becomes smaller. However, there was a problem that it gradually decreased.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a screen mask cleaning device capable of effectively cleaning and removing cream solder adhering to the edge of the pattern hole of the screen mask.

[0007]

To this end, the present invention is provided above the screen mask and below the screen mask, and an air blowing portion for blowing the air pressure-fed from the pneumatic device onto the upper surface of the screen mask. Then, the suction part for sucking the cream solder in the pattern hole opened in the screen mask by the vacuum pressure of the air suction device, and the air blowing part and the suction part are reciprocally moved in the horizontal direction along the screen mask. A screen mask cleaning device is composed of the reciprocating means.

[0008]

According to the above construction, the air blowing portion and the suction portion are horizontally reciprocated by driving the reciprocating means. Then, the cream solder adhering to the edge portion in the pattern hole is blown downward by the air jetted from the air blowing portion, or the adhesive force is weakened, and the vacuum pressure of the air suction device causes these Since the cream solder is sucked into the suction portion, the cream solder attached to the edge of the pattern hole of the screen mask can be effectively cleaned and removed.

[0009]

【Example】

(Embodiment 1) Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a screen mask cleaning device according to the present invention, and FIG. 2 is a side view of the same. 31
Is an air blowout part, which is above the screen mask 1 and blows air pressure-fed from the pneumatic device 50 onto the upper surface of the screen mask 1.

Reference numeral 32 denotes a tube connected to the air blowing portion 31, one end of which is connected to the pneumatic device 50.
When the air pressure device 50 is driven, the air that has been pressure-fed is blown from the tube 32 and the air blowing portion 31 onto the upper surface of the screen mask 1, and becomes a violent turbulent flow in the air blowing portion 31. Thereby, the pattern holes 6 of the mask 1
The cream solder 7'attached to the inner edge portion is blown off downward by the blown air, or the adhesive force is weakened.

A roller 2 is located below the screen mask 1 and wipes the cream solder 7 attached to the back surface of the mask 1 with a soft tape-shaped paper 3 wound around the roller peripheral surface. Reference numeral 4 is a pressing roller. Note that such a means for wiping the cream solder 7 is not always necessary.

Reference numeral 13 is a suction nozzle as a suction unit,
The cream solder 7'in the pattern hole 6 formed in the screen mask 1 below the screen mask 1
Aspirate. The suction nozzle 13 is arranged at a position facing the air blowing portion 31 with the screen mask 1 interposed therebetween. The air blower 31 is provided with the screen mask 1
Is a trumpet type that is close to the upper surface of the suction nozzle 1
3. The suction range of air by 3 is limited to increase the vacuum pressure, and the cream solder 7'is effective even with a relatively small suction force.
Can be sucked.

Reference numeral 8 denotes a casing in which the roller 2, the pressing roller 4, and the suction nozzle 13 are housed. Reference numeral 9 denotes a nut, which is provided at the bottom of the casing 8. 10 is a ball screw and M is a motor. In FIG. 2, reference numerals 33 and 36 denote brackets that connect the casing 8 and the air blowing portion 31. Reference numeral 33a is a hinge provided in the middle portion of the bracket 33, and 36a is a hooking member provided in the middle portion of the bracket 36 (see also FIG. 3). The air blower 31 is detached from the casing 8 by removing the hooking member 36a and rotating the hinge 33a around the hinge 33a.

When the motor M is driven, the ball screw 10
The air blower 31 and the suction nozzle 13 rotate horizontally along the screen mask 1 with the direction of arrow A in FIG. 1 as the direction of advance during cleaning and the direction of arrow B in FIG. 1 as the direction of advance during pullback. Move back and forth. These constituent parts 8 to 10, 33, 36, M constitute a reciprocating means 34.

FIG. 3 is a perspective view of an essential part inside the casing 8. Reference numeral 11 denotes a horizontally long main body portion housed in the casing 8, and the tube 12 is attached to the air suction device 51 (see FIG. 1).
Connected through. The suction nozzle 13 is urged on the main body 11 via a hinge 14 having a spring 14a. In FIG. 4, reference numeral 15 is a height adjusting bolt, which is erected in the casing 8 to adjust the height of the suction nozzle 13. Reference numeral 16 is a filter for the sucked cream solder 7 ', which is housed in the upper portion of the main body 11 in a replaceable manner. By driving the air suction device 51, the cream solder 7 ′ in the pattern hole 6 is sucked from the nozzle 13 and filtered by the filter 16. The replacement of the filter 16 is performed by tilting the nozzle 13 sideways around the hinge 14 and opening the upper part of the main body 11 as shown by the chain line in the figure.

The present apparatus has the above-mentioned structure, and its operation will be described below. As shown in FIG. 1, the motor M is driven to move the air blow-out portion 31 and the suction nozzle 13 to the arrow A in FIG.
The direction is set as the traveling direction, and the screen mask 1 is moved horizontally. Then, in FIGS. 2 and 4, the cream solder 7 ′ attached to the edge portion in the pattern hole 6
The air is blown off downward by the air blown from the air blowing portion 31, or the adhesive force is weakened by the jetted air or the air that has become a turbulent flow in the air blowing portion 31. At the same time, since the cream solder 7'is sucked into the suction nozzle 13 by the vacuum pressure of the air suction device 51, the cream solder 7'that adheres to the edge of the pattern hole 6 of the screen mask 1 is effective. Can be removed by cleaning.

Then, in FIG. 4, the cream solder 7 attached to the back surface of the mask 1 is wiped off by the paper 3 wound around the roller 2. In this way, not only the edge of the pattern hole 6 but also the back surface of the screen mask 1 can be cleaned.

In FIG. 1, when the cleaning operation of the screen mask 1 is completed, the motor M is rotated in the reverse direction and the driving is stopped, and the air blowing portion 31 and the suction nozzle 1 are stopped.
3 is moved to the original position in the direction of arrow B in the figure, and is put on standby for the next cleaning.

(Embodiment 2) FIG. 5 is a sectional view of a main part of a screen mask cleaning apparatus according to another embodiment of the present invention.
Is a nozzle as an air blowing portion, and its tip is arranged close to the upper surface of the screen mask 1. The nozzle 35 blows air on the upper surface of the screen mask 1 to clean and remove the cream solder 7 ′ adhering to the inside of the pattern hole 6.

[0020]

As described above, the present invention is provided above the screen mask and below the screen mask, and an air blowing portion for blowing the air pressure-fed from the pneumatic device to the upper surface of the screen mask. A suction part that sucks the cream solder in the pattern hole opened in the screen mask by the vacuum pressure of the air suction device, and a reciprocating movement that horizontally reciprocates the air blowing part and the suction part along the screen mask. Since it constitutes the screen mask cleaning device from the means,
During the cleaning work, the cream solder that adheres to the edge of the pattern hole is blown down by the air blown from the air blowing part, or the adhesion is weakened, and the vacuum pressure of the air suction device Since the cream solder is sucked by the suction portion, the cream solder attached to the edge portion of the pattern hole of the screen mask can be effectively cleaned and removed.

[Brief description of drawings]

FIG. 1 is a front view of a screen mask cleaning device according to a first embodiment of the present invention.

FIG. 2 is a side view of the device.

FIG. 3 is a perspective view of the main part of the device.

FIG. 4 is a sectional view of the main part of the device.

FIG. 5 is a cross-sectional view of essential parts of a screen mask cleaning device according to a second embodiment of the present invention.

FIG. 6 is a side view of a conventional screen mask cleaning device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screen mask 6 Pattern hole 7 Cream solder 7'Cream solder 13 Suction part 31 Air blowing part 34 Reciprocating moving means 35 Air blowing part 50 Air pressure device 51 Air suction device

Claims (1)

[Claims] 1. An air blow-out portion above a screen mask for blowing air pumped from an air pressure device onto the upper surface of the screen mask, and below the screen mask by a vacuum pressure of an air suction device. A suction unit for sucking the cream solder in the pattern hole opened in the mask, and a reciprocating means for reciprocating the air blowing unit and the suction unit in the horizontal direction along the screen mask. Screen mask cleaning device.