JP3316524B2 - Squeegee device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squeegee apparatus for a screen printing machine for printing a solder paste on a printed board, which is a printing substrate, through a screen plate having a plurality of holes having a predetermined print pattern.

[0002]

2. Description of the Related Art At the bottom, a pair of front and rear spatulaes that come into contact with the upper surface of a screen plate, and a horizontally long supply port configured to be opened and closed by a rear spatula among the pair of spatulaes. A housing provided with a space for accommodating the solder paste to be dispensed onto the screen plate through the supply port, and the supply port being closed when not printing and being opened only at each printing. And the rear spatula slides on the top surface of the screen plate to perform screen printing only when the housing is advanced for printing. A squeegee device configured to function as a squeegee is already known (Japanese Patent Laid-Open No. 4-24 / 1990).
No. 2993).

In this type of squeegee apparatus, when mounting a chip-shaped electronic component on a printed circuit board, a solder is formed by kneading a solder alloy powder and a high-viscosity liquid flux prior to the mounting operation. -It is very convenient because the conductor pattern on the printed circuit board can be screen printed while the paste is automatically supplied on the screen plate. The screen plate used for screen printing includes a silk screen and a metal screen. The latter is generally made of a thin stainless steel sheet, and is superior in mechanical strength and the like. Widely used for screen printing.

[0004]

In screen printing, the squeegee slides in contact with the upper surface of the screen plate, and the sliding causes the viscous printing material to be forcibly fed into the holes of the screen plate. Through the squeegee and the screen printing plate, and the frictional contact between the squeegee and the screen printing plate is performed by mechanical reversal. It is likely that one or both need to be replaced with new ones early.
In particular, when the printing material is a solder paste, since a large number of fine solder particles are contained in the printing material, the solder particles move between the lower end of the squeegee and the upper surface of the screen plate during movement of the squeegee. When it enters, it performs a rubbing action like a file.

In a conventional squeegee device of the type described above, the rear spatula acting as a squeegee is slidably operatively connected to a supply port opening / closing mechanism, and is integrally formed with the movable rear wall of the housing. Because of the opening and closing movement, there is a tendency for vibration during printing and fluctuations in printing pressure on the screen plate to occur easily, and a gap generated between the lower end of the squeegee and the upper surface of the screen plate due to the vibration or fluctuation. In addition, the solder paste containing solder particles and flux enters, causing not only friction to occur, but also leakage backward from the gap, causing the solder paste to leak, and the leaked paste remains on the screen plate. Solder particles with insufficient flux will fill the holes of the screen plate at the next printing, resulting in uneven print finish. Inconvenient situation that leads to a decrease in printing accuracy was also occur.

Further, since the paste easily leaks from the gap between the lower portions of the side walls of the housing and the lower portions of the side surfaces of the spatula, the above-mentioned inconvenience occurs. Furthermore, the supply of the paste stored in the space of the housing onto the screen plate tends to be excessive or lack smoothness. In this type of conventionally known squeegee apparatus, these points are not always sufficiently considered.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the squeegee apparatus, and has no disadvantages or disadvantages as described above. SUMMARY OF THE INVENTION It is a main object of the present invention to provide a squeegee device for a screen printing machine for solder paste on a printed circuit board, which is capable of realizing high density and the like.

[0008]

In order to achieve the above object, a squeegee device for a screen printing machine according to the present invention is provided.
A bottom is provided with a pair of front and rear spatulas in contact with the upper surface of the screen plate, and a horizontally long supply port located between the pair of spatulas and configured to be openable and closable. And a housing having a space for storing the solder paste when the printing is not performed, and releasing the solder paste stored in the space on the screen plate at each printing. When the housing is advanced for printing, the back spatula of the pair of spatulas slides on the screen plate along with the housing when the housing is advanced for printing. A squeegee device for a screen printing machine configured to act as a squeegee. When the supply port is released, the solder paste stored in the space is guided to the guide path and discharged from the supply port. The amount of solder paste to be dispensed on the screen plate is limited by the cross-sectional area of the guide passage, so that the necessary and sufficient amount of paste is discharged and supplied for printing at each printing. It is characterized by having comprised in.

In the squeegee device according to the present invention, the housing is a pair of side walls parallel to each other in a moving direction of the housing, a rear wall fixed to an opposing inner wall surface at a rear portion of the side wall, and the side wall. A movable front wall that can swing so as to advance and retreat with respect to the rear wall in a state in contact with a front portion of each inner wall surface, and a rear spatula body is provided on the fixed rear wall with a front spatula shape. A body is fixed to the movable front wall by tilting it obliquely rearward and downward, and the movable front wall is operatively connected to the supply port opening / closing mechanism. Further, the squeegee device according to the present invention may be configured such that, in any one of the above-described ones, the pair of spatula-shaped bodies of the solder paste discharged and supplied from the supply port through the guide passage to a lower portion of both side walls of the housing. A leakage preventing means for preventing leakage from a lower portion of the side surface is provided. Furthermore, the squeegee device according to the present invention is characterized in that, in any one of the above-mentioned ones, each of the spatula-shaped members is formed of a thin strip-shaped steel plate, and a lower end that comes into contact with the upper surface of the screen plate is rounded. It is assumed that. In addition, the squeegee device according to the present invention, in any one of the above, by axially providing a roller that is rotated forward and reverse by a reversible motor attached to the housing in the space, and by rotating the roller forward. While applying discharge pressure to the paste in the space,
By reversing the roller, the paste around the roller is urged upward to prevent the paste from flowing down.

Further, the squeegee device for a screen printing machine according to the present invention has a pair of front and rear spatula-shaped members which are in contact with the upper surface of the screen plate at the bottom, and are located between the pair of spatula-shaped bodies so as to be opened and closed. A housing having a horizontally long supply port configured therein, and a housing having a space for accommodating the solder paste therein, and the supply port closed during non-printing and stored in the space during each printing. A supply port opening / closing mechanism configured to be releasable to dispense the solder paste onto the screen plate, and when the housing is advanced for printing, the pair of spatula-shaped members are accordingly attached. A squeegee device for a screen printing machine, wherein a rear spatula of the body slides on the screen plate to function as a squeegee; Are a pair of side walls parallel to each other in the direction of movement, a rear wall fixed to the opposing inner wall of the rear part of the side wall, and a rear wall in contact with the front part of each inner wall of the side wall. A movable front wall capable of swinging so as to advance and retreat, a rear spatula being attached to the fixed rear wall, and a front spatula being attached to the movable front wall via a clamp assembly. The movable front wall is operatively connected to the supply opening / closing mechanism, and the movable front wall is connected at one end to a paste supply device for forcibly feeding solder paste into the space. An opening for connecting the other end of the conduit is provided.

In the squeegee device according to the present invention, since the space of the housing is formed so as to form the above-described guide passage at least at a lower portion thereof, the solder paste is applied to the upper surface of the screen plate. Discharge supply is performed smoothly, and the supply amount during printing is stabilized. In addition, the rear spatula acting as a squeegee is fixed to the rear wall of the housing by being inclined obliquely downward and rearward, so that the rear spatula has stability, and the printing pressure on the screen plate during screen printing is stable. Is minimized. Other functions will be described later in connection with the embodiment.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings showing embodiments thereof.

In the drawing, reference numeral A denotes a pair of front and rear spatula-shaped members 2A and 2B at the bottom which come into contact with the upper surface of the screen 1, and a horizontally elongated supply port located between the pair of spatula-shaped bodies and configured to be openable and closable. 3 and a space 5 for accommodating a solder paste 4 as a viscous printing material to be dispensed onto the screen 1 through the supply port 3 therein, and the squeegee device according to the present invention comprises: Housing A
A supply port opening / closing mechanism B configured so that the supply port 3 is closed during non-printing and the solder paste stored in the space can be released for dispensing onto the screen at each printing. When the housing A is advanced in the direction of arrow X shown in FIG. 1 for printing, a pair of the spatula-shaped bodies 2A is
Of the 2B, the rear spatula 2B slides on the screen 1 so as to function as a squeegee for filling the solder paste into the pattern opening 1A.

The housing A has a pair of side walls 6A and 6B substantially parallel to each other in the direction of movement, a rear wall 7 fixed to the opposing inner wall at the rear part of the side walls, and the side walls 6A and 6B.
A movable front wall 8 which can swing so as to advance and retreat with respect to the rear wall 7 in contact with the front part of each inner wall surface of B, and an upper opening of a space 5 defined inside these four peripheral walls is opened and closed. And a sealable structure.

As can be clearly seen from FIGS. 2 and 3, the fixed rear wall 7 extends obliquely downward toward the movable front wall 8 and extends at right angles to the direction of movement of the housing A. The movable front wall 8 includes a stepped portion 7A, and the movable front wall 8 extends obliquely downward toward the fixed rear wall 7, and includes a bottom wall portion 8A that extends perpendicular to the moving direction of the housing A. A mounting surface 8D for the front spatula 2A is formed at the rear of the bottom wall 8A. Numeral 10 indicates that the front wall is
A pivot is pivotally supported by A and 6B so as to be able to swing back and forth.

The movable front wall 8 is operatively connected to the above-described supply port opening / closing mechanism B, as will be described later. The front spatula 2A is fixed to the movable front wall 8 and the rear spatula 2B is fixed. Each is fixed to the rear wall 7. Both spatula 2A, 2
In the illustrated example, B is formed of a thin strip-shaped steel sheet produced from a steel sheet having high elasticity and rigidity such as a carbon steel strip or an alloy steel strip used as a thin leaf spring material. The lower ends 2A 'and 2B', which are in contact with the screen, are each formed in a round shape in order to minimize friction when sliding in contact with the upper surface of the screen.

Among the front and rear spatula-shaped bodies 2A and 2B (hereinafter, for convenience, the former is referred to as a leading blade and the latter is referred to as a trailing blade), the attaching means for fixing to the movable front wall 8 of the leading blade 2A is In the example shown in the figure, there is one clamp assembly 14 comprising an L-shaped elongated fastening member 11, an elongated fastening member 12 having a right-angled triangular cross section, and a plurality of fastening screws 13. Is held between the two tightening members 11 and 12 fastened by the screws 13, and the clamp assembly 14 as shown in FIG. The outer surface 11A 'of one side 11A of the L-shaped tightening member 11 is screwed to 8D to be fixed to the movable front wall 8. On the other hand, mounting means for fixing the trailing blade 2B serving as a squeegee to the fixed rear wall 7 is as follows.
In the illustrated example, one clamp assembly 18 includes an elongated fastening member 15 having an L-shaped cross section having a short side and a long side, an elongated fastening member 16 having a rectangular cross section, and a plurality of fastening screws 17. The trailing blade 2B is connected to the two fastening members 15, 1 fastened by the screw 17.
The clamp assembly 18 is screwed to another assembly 19, which will be described later, which is attached to the receiving step 7A of the fixed rear wall 7 as in the case of the leading blade 2A. In this way, the two assemblies 18 and 19 are integrally assembled to form a coupling unit 20 and the coupling unit 20 is fixed to the stationary rear wall 7 by attaching the coupling unit 20 to the receiving step 7A. . This makes it possible to efficiently perform the mounting work and the replacing work of the leading blade 2A and the trailing blade 2B on the movable front wall 8 and the fixed rear wall 7, respectively.

In the example shown, the assembly 19 attached to the receiving step 7A of the fixed rear wall 7 includes a block-shaped mounting member 27 screwed to the receiving step 7A and a thin strip-shaped steel plate described later. And a partition plate 28 made of
The front end face 2 of the mounting member 27 in a state where
The assembly 19 comprises an elongated fastening member 29 having a short side and a long side, and having an L-shaped cross section, and is attached to the receiving step 7A.
When the assembly 18 or the assembly 25 is screwed to the assembly 9, they are connected to each other, and the partition plate 28, the outer surface of the elastic short side 29 A of the L-shaped tightening member 29 and the elastic short side of the L-shaped tightening member 15 or 21. The outer surface of 15A or 21A faces the outer surface 11A 'of one side 11A of the L-shaped tightening member 11 attached to the movable front wall 8 described above. A coupling unit 20 between the assembly 18 and the assembly 19 or a coupling unit 26 between the assembly 25 and the assembly 19
Is attached to the receiving step 7A, an opposing surface is formed in the same manner as in the above case. In any case, in the illustrated example, the movable front wall 8 approaches the fixed rear wall 7 and the outer surface of one side 11A of the member 11 is connected to the member 15 or 2.
When it comes into contact with the outer surface of the short side 15A or 21A, the elongated supply port 3 is closed.

Reference numeral 30 denotes the partition plate 28 screwed to the lower end surface 31A of the inner wall 31 fixed vertically to the inner surface of the fixed rear wall 7 so as to project substantially horizontally from the inner surface of the rear wall.
A partition plate made of a thin strip-shaped steel plate similar to
The leading end portions 28A, 30A of the two partition plates 28, 30 are provided in the space 5 between the pair of side walls 6A, 6B by a reversible motor attached to the housing A so as to be rotatable forward and reverse. Is elastically contacted over its entire length in the longitudinal direction, and the solder paste 4
From the space 5 behind the roller 32 into the space 46 defined by the partition.

The space 5 of the housing A for storing the solder paste 4 is formed so that at least a lower portion thereof is inclined obliquely rearward and downward, and forms a guide passage 33 having a narrow front-rear interval that terminates in the horizontally long supply port 3. When the supply port 3 is formed and the supply port 3 is opened, the solder paste 4 stored in the space 5 is smoothly guided obliquely downward and rearward by the guide passage 33, and is discharged from the supply port to discharge the screen. The amount of solder paste to be dispensed onto the plate 1 is limited by the cross-sectional area of the guide passage 33, so that the amount of paste necessary and sufficient for printing is discharged and supplied at each screen printing. Shall be used. In the example shown in the figure, the guide passage 33 is a first guide surface on the movable front wall 8 side which is formed by an inclined inner wall surface 8B of the movable front wall 8 and a rear surface 11 'of one side 11A of the L-shaped member 11. and G _1, and the front 28B of the fixed rear wall 7 side of the lower partition plate 28, the short side portion 15A of the L-shaped member 15
'And front 29A of the short side portion 29A of the L-shaped member 29' front 15A and the second guide surface G ₂ consisting of a, side walls 6A,
6B and a lower portion of each inner wall surface.

The solder paste is a viscous fluid, and keeps deforming when a shear force acts. That is, it flows. At this point, the deformation rate is proportional to the shear force, and is essentially distinguished from the solid. Thus, the solder paste basically follows Newton's viscosity equation or law of viscosity in fluid dynamics or "rheology". Then, when the roller 32 is rotated forward, that is, rotated counterclockwise in FIG. 2, the discharge pressure acts on the paste 4 in the space 5, and the paste 4 passes through the released supply port 3 through the screen 3. 1 is pushed out to the upper surface. In this case, fluidization of the solder paste 4 is promoted with a decrease in viscosity due to shear deformation generated when passing through the guide passage 33, and the solder paste 4 is smoothly guided obliquely downward and rearward by the guide passage 33. The flow rate, and thus also the discharge rate, is not excessive, since it is limited by the narrow and limited cross-sectional area of the guide passage.
It becomes possible to make it appropriate. In other words, it is possible to supply a necessary and sufficient paste at every printing.

Next, when the roller 32 is rotated in the reverse direction, that is, rotated counterclockwise in FIG. 2, the solder paste 4 around the roller 32 is rotated by the pressure acting in the opposite direction due to the reverse rotation of the roller. Since it is urged upward and the flow is prevented, the outflow outside the supply port 3 is also prevented. Therefore, when the screen printing is completed, the supply port 3 is closed, but if the roller 32 is reversed just before that, the leakage of the solder paste before the completion of the closing can be prevented. It is desirable that the reversible motor M be connected to an acceleration / deceleration device so that the speed can be increased / decreased as necessary.

The supply port opening / closing mechanism B includes a housing side wall 6A.
And an operating mechanism 35 operatively connected to the actuator 34. In the illustrated example, the actuator 34 includes an air cylinder 34A and a piston rod. 34B, the piston rod 34B is formed in an inverted letter shape, and engages a forked portion 36 provided at the lower end with a projection 37 protruding from a lower portion of the movable front wall 8;
An intermediate portion is pivotally connected via a pivot 39 to the upper end of an operation arm 35A pivotally connected to a side wall 6A via a pivot 38.
In this example, the supply port 3 is opened when the upper end of the operation arm 35A is pulled by the piston rod 34B, and is closed when pressed.

In FIG. 1, reference numeral 40 denotes a pair of side walls 6.
A pair of projections provided on the tops of A and 6B, each projection 40 has a horizontal hole 41, respectively.
Is an operating mechanism (not shown) for moving the housing A in the front-rear direction along a pair of guide rails (not shown) and an operating mechanism (not shown) for vertically moving the housing with respect to the guide rails. ) To operatively connect the housing.

In FIGS. 1, 9 and 10, reference numeral 42
Is an opening provided in the fixed rear wall 7 for connecting the other end of the supply conduit having one end connected to a supply device (not shown) for forcibly feeding the solder paste into the space 5 of the housing A. The opening 42 communicates with an elongated space 43 having substantially the same length as the roller 32, and the solder paste pumped from the supply device first enters the space 43, and then enters the inner wall 31 along the axis of the roller 32. It is squeezed out linearly above the partition plate 30 that is in contact with the upper part of the roller 32 through a number of inlets 44 (see FIG. 11) formed along it. Reference numeral 45 denotes both side walls 6A, 6A of the housing A.
B is a leakage prevention member attached to the lower part of B to prevent the solder paste 4 from leaking from the lower side surfaces of the pair of spatula-shaped bodies 2A and 2B. It is designed to be able to prevent residue and residue.

Although the present invention has been described in detail with respect to a preferred embodiment for screen printing of a solder paste, the squeegee apparatus according to the present invention is also applicable to screen printing of a relatively low-viscosity printing material such as printing ink. Of course, it can be used.

Since the present invention is configured as described above, it has the following effects.

In the squeegee device according to the first aspect, the space for storing the solder paste is formed so as to be inclined obliquely rearward and downward at least at a lower portion thereof, and to be a guide passage having a narrow front-rear space terminating at the supply port. Since it is formed so that the amount of solder paste discharged from the supply port through the guide passage is limited by the cross-sectional area of the guide passage, it is necessary for printing at each screen printing. A sufficient amount of the solder paste can be smoothly discharged and supplied, and adverse effects due to the excessive supply can be avoided. In the squeegee device according to the second aspect, the rear spatula that functions as a squeegee has stability, and can effectively suppress vibration and fluctuations in printing pressure during screen printing. It is possible to effectively solve the above-mentioned problems caused by fluctuations in printing pressure, and as a result, to achieve higher efficiency of printing work, remarkable improvement in printing accuracy, higher printing density, and the like. Can be done. In the squeegee device according to the third aspect, the solder and the solder from the lower part of the side surface of the pair of spatula-shaped members are provided.
Since the leakage of the paste can be prevented, the leakage can prevent the paste from remaining on the screen plate and becoming a residue. In the squeegee device according to claim 4, since each of the spatula-shaped members is formed of a thin strip-shaped steel plate and the lower end in contact with the upper surface of the screen plate is formed round, the screen is not only rich in elasticity and rigidity but also has a screen. Since the friction when moving on the plate is extremely small, the durability is improved, and it is possible to prevent early wear of the spatula or the screen plate.

In the squeegee apparatus according to the fifth aspect, after the screen printing is completed, the roller is fed just before the supply port is closed, so that the leakage of the paste before the closing is completed can be prevented. it can.

In the squeegee apparatus of claim 6, in addition to the advantages described in claim 2, when the remaining amount of the paste in the space is reduced, the amount of the decrease is supplied from the paste supply apparatus as necessary. It is possible to make up for it.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a squeegee device according to the present invention.

FIG. 2 is an enlarged vertical sectional side view of a main part of the embodiment apparatus shown in FIG. 1 with a side wall and the like removed.

FIG. 3 is a side view showing an example of unitization of the blade attaching means shown in FIG. 2;

FIG. 4 is a side view showing an example of unitization of the rear blade attaching means shown in FIG. 3;

FIG. 5 is a perspective view of the embodiment apparatus shown in FIG. 1 as viewed from the opposite side.

FIG. 6 is a bottom view of the embodiment apparatus shown in FIG. 1;

FIG. 7 is a side view of a supply port opening / closing mechanism.

FIG. 8 is a front view of FIG. 7;

FIG. 9 is a partially omitted side view showing a closed state of a supply port of the embodiment apparatus shown in FIG. 1;

FIG. 10 is a side view similar to FIG. 9, showing the open / closed state of the supply port.

FIG. 11 is an elevation view showing the inside of the housing with the movable front wall opened.

[Explanation of symbols]

 Reference Signs List A Housing B Supply port opening / closing mechanism P Printed circuit board 1 Screen 2A Front spatula 2B Back spatula 3 Supply port 4 Solder paste 5 Space 6A, 6B Side wall 7 Fixed rear wall 8 Movable front wall 33 Guide passage 45 Paste leakage Prevention member

Claims (6)

(57) [Claims] 1. A bottom plate comprising a pair of front and rear spatula bodies in contact with an upper surface of a screen plate, and a horizontally long supply port located between the pair of spatula bodies and configured to be openable and closable. A housing having a space for storing the solder paste therein, the supply port being closed when not printing, and the solder and the solder stored in the space being printed each time.
A supply port opening / closing mechanism configured to be released so as to dispense the paste onto the screen plate, and when the housing is advanced for printing, the pair of spatula-shaped members is accordingly moved. Among them, in a squeegee device of a screen printing machine in which a rear spatula is configured to slide on the screen plate to function as a squeegee, the space is inclined obliquely rearward and downward at least in a lower portion thereof, And a guide passage having a narrow front-rear interval that terminates in the supply port, and when the supply port is released, the solder paste contained in the space is guided by the guide path and The amount of solder paste discharged from the mouth and dispensed onto the screen plate is limited by the cross-sectional area of the guide passage, Times of the squeegee device screen printer, characterized by being configured as necessary and sufficient degree of the paste is discharged and supplied to the printing during the printing. 2. The housing is in contact with a pair of side walls parallel to each other in a direction of movement thereof, a rear wall fixed to an opposing inner wall surface at a rear portion of the side wall, and a front portion of each inner wall surface of the side wall. A movable front wall capable of swinging so as to advance and retreat with respect to the rear wall, and a rear spatula-shaped body is fixed to the fixed rear wall, and a front spatula-shaped body is inclined rearward and downward to the movable front wall, respectively. 2. The squeegee device for a screen printing machine according to claim 1, wherein said movable front wall is operatively connected to said supply port opening / closing mechanism while being fixed by being inclined. 3. A leakage prevention device for preventing the solder paste discharged and supplied from the supply port from a lower part of both side walls of the housing from a lower part of a side surface of the pair of spatulaes from the supply port. 3. The squeegee device for a screen printing machine according to claim 1, wherein each of the means is provided. 4. The method according to claim 1, wherein each of the spatula-shaped members is formed of a thin strip-shaped steel plate, and a lower end in contact with an upper surface of the screen plate is formed in a round shape. A squeegee device for a screen printing machine according to claim 1. 5. A roller, which is rotated forward and reverse by a reversible motor mounted on the housing in the space, and applies a discharge pressure to the paste in the space by rotating the roller forward. The screen printing machine according to any one of claims 1 to 4, wherein the roller around the roller is reversely urged to urge the paste around the roller upward to prevent the paste from flowing down. Squeegee equipment. 6. A bottom comprising a pair of front and rear spatula bodies in contact with the upper surface of the screen plate, and a horizontally long supply port located between the pair of spatula bodies and configured to be openable and closable, A housing having a space for storing the solder paste therein, the supply port being closed when not printing, and the solder and the solder stored in the space being printed each time.
A supply port opening / closing mechanism configured to be released so as to dispense the paste onto the screen plate, and when the housing is advanced for printing, the pair of spatula-shaped members is accordingly moved. In the squeegee device for a screen printing machine, the rear spatula is configured to slide on the screen plate to function as a squeegee, the housing includes a pair of side walls parallel to each other in a moving direction thereof, and the side walls; A rear wall fixed to the opposing inner wall surface of the rear portion of the rear wall, and a movable front wall that can swing so as to advance and retreat with respect to the rear wall while being in contact with the front portion of each inner wall surface of the side wall. ,
A rear spatula is fixed to the fixed rear wall and a front spatula is fixed to the movable front wall by inclining obliquely rearward and downward through a clamp assembly, respectively, and the movable front wall is fixed to the supply port opening / closing mechanism. And an opening for connecting the other end of the supply conduit having one end connected to the paste supply device for forcibly feeding the solder paste into the space on the rear wall. Squeegee device for a screen printing machine.