JP2003170570A - Screen printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively prevent the generation of a crack in a supply pipe for a washing agent at supply thereof. <P>SOLUTION: The screen printing machine equipped with a cleaning unit for removing the solder paste adhering to a mask sheet has a washing agent supply means 60 for supplying the washing agent for washing the mask sheet. The washing agent supply means 60 is provided with a container body 46 for housing the washing agent, the cap member 47 attached to the container body 46 in a detachable manner, a lead-out pipe 53 for leading out the washing agent in the container body 46 to the outside, and the connection metal fitting 54 connected to the leading end of the lead-out pipe 53. The supply pipe 50 of the washing agent provided to the printing machine body and the lead-out pipe 53 are connected in a detachable manner by the connection metal fitting 54. <P>COPYRIGHT: (C)2003,JPO

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 applying a solder paste composed of a mixture of a solder powder and a paste-like flux to a substrate, and in particular, cleaning by wiping the solder paste adhering to a mask sheet with a cleaning paper. The present invention relates to an improvement of a screen printing machine equipped with a unit.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Laid-Open No. 10-235843.
As shown in the publication, a cleaning head (vacuum squeegee) having a vacuum nozzle, a cleaning paper supply section, a cleaning paper take-up roll, and a cleaning unit provided with the cleaning head and the like are moved forward and backward. The cleaning sheet is moved forward and backward while the suction force is applied by the cleaning head in a state where the cleaning paper is in contact with the back surface of the mask sheet. There is known a screen printing machine configured to wipe off the solder paste attached to the back surface of the (screen) or the opening.

The above-mentioned screen printing machine is provided with a cleaning agent supplying means having a cleaning agent spraying nozzle, and at the time of cleaning the mask sheet, the cleaning agent supplied from the cleaning agent accommodating section is sprayed onto the portion to be cleaned. It is configured to improve the cleaning efficiency of the mask sheet with the cleaning paper. As shown in FIG. 7, the cleaning agent accommodating portion is usually provided with a holding table 48 provided outside the base 1.
A container body 46 made of a bottle or the like containing a cleaning agent
A is installed, and a cap member 47a is fixed to the upper end of the container body 46a by means such as screwing or pressure bonding.

Further, a cleaning agent supply pipe 61 for supplying the cleaning agent in the container body 46a to a spray nozzle and a pressurized air for introducing pressurized air supplied from a pressure pump 62 into the container body 46a. The introduction pipe 63 of the cap member 47
It is installed so as to penetrate a. Then, the pressurized air is introduced into the container body 46a through the introduction pipe 63, so that the cleaning agent in the container body 46a is supplied to the spray nozzle 22 through the supply pipe 61 according to the pressure. It has become so.

[0005]

When the cleaning agent in the container body 46a is consumed and the remaining amount thereof becomes small, it is necessary to replenish the cleaning agent in the container body 46a. To this end, the container main body 46a held on the holding table 48 is rotated to release the screwed state of the cap member 47a, or the cap member 47a is pulled out to remove the cap member 47a from the container main body 46a. It is necessary to use the cap member 47a when performing this removal work.
There is a problem that cracks easily occur in the cleaning agent supply pipe 61 and the pressurized air introduction pipe 63 installed in the above.

That is, since the cap member 47a can be removed from the container body 46a and the spraying position of the cleaning agent by the spraying nozzle 22 can be changed, the supply pipe 61 and the introduction pipe 63 are provided.
Is formed of a flexible pipe made of a soft plastic material or the like, and when the cap member 47a is removed from the container body 46a, a large bending force or the like repeatedly acts on the supply pipe 61 or the like to cause cracks. Forming is inevitable. When the cleaning agent supply pipe 61 is cracked, the cleaning agent cannot be supplied.

The present invention has been made in view of the above points, and provides a screen printer capable of effectively preventing cracks in the cleaning agent supply pipe when the cleaning agent is replenished. Is intended.

[0008]

The invention according to claim 1 is
In a screen printing machine equipped with a cleaning unit that removes the solder paste adhering to the mask sheet,
A cleaning agent supply means for supplying a cleaning agent for cleaning the mask sheet, the cleaning agent supply means includes a container main body for containing the cleaning agent, and a cap member detachably attached to the container main body; A lead-out pipe for leading out the cleaning agent in the container body to the outside and a connecting metal fitting connected to the tip of the lead-out tube are provided, and by this connecting metal fitting, a cleaning agent supply pipe provided in the printer body, The outlet pipe is detachably connected.

According to the above construction, when the cleaning agent is replenished into the container body, by disconnecting the connection state between the connecting fitting and the cleaning agent supply pipe, a large bending force or the like is applied to the supply pipe. It is possible to remove the container body and the cap member in an integrated state from the printer body while preventing them from acting.

According to a second aspect of the invention, in the screen printing machine according to the first aspect, the cleaning agent supply means is provided with a supply pump for sucking the cleaning agent in the container body and supplying it to the spraying section. Is.

According to the above construction, the cleaning agent in the container body is supplied to the cleaning agent spraying section through the supply tube without providing an introducing tube for introducing pressurized air into the container body. Become.

[0012]

FIG. 1 shows an embodiment of a screen printing machine according to the present invention. This screen printing machine includes a printing machine main body 2 having a base 1 and a printed circuit board W.
The substrate supporting unit 3 for supporting the substrate W is provided, and the conveyor 3A for loading and unloading the substrate W is placed and fixed on the substrate supporting unit 3.

Although not shown in detail in the drawings, the substrate support unit 3 has a lifting / lowering rotary table 4 installed on the base 1. The lifting / lowering rotary table 4 is provided on the base 1 or on the base 1. With the moving mechanism provided, the X-axis direction of the printing machine main body 2 (the loading / unloading direction of the substrate W by the conveyor, that is, the direction orthogonal to the paper surface of FIG. 1), the Y-axis direction (the left-right direction of FIG. 1), Z The support position of the substrate W is movable in the axial direction (vertical direction) and the θ direction (rotational direction around the Z axis).

The main body 2 of the printing press has support columns 2a arranged at the four corners of the base 1, and support frames 2a at the four corners.
U-shaped upper frame 2 which is installed so as to connect the upper parts of the two and the front part (left part of FIG. 1) is opened.
b.

A mask sheet 7 whose entire circumference is held by a frame member 8 fixed to the upper frame 2b is arranged above the substrate supporting unit 3, and above the mask sheet 7, a squeegee mechanism is provided. 5 are arranged. The squeegee mechanism 5 is provided with rail members 5a respectively provided on a pair of front and rear upper frames 2b arranged in a direction orthogonal to the paper surface of FIG. 1, and is mounted on each rail member 5a to be mounted in the Y-axis direction (see FIG. A girder member 5b movable by a single axis robot (not shown), a pair of squeegees 9 and 9 for spreading and extending the solder paste on the mask sheet 7, and the girder member 5b. The squeegee 9 and the lifting means 10 for moving the squeegee 9 are provided.

Further, as shown in FIG. 2, the moving means comprising a moving mechanism 6 for moving the substrate supporting unit 3 in the Y-axis direction is a screw shaft 11 installed on the base 1, and the screw shaft 11 It has a drive motor 12 such as a servo motor for rotationally driving, a slide block 13 fixed to the bottom surface of the lifting / lowering rotary table 4, and a guide rail 14 extending on the base 1 in the Y-axis direction. Then, the drive motor 12 is operated, the screw shaft 11 is rotationally driven, and the slide block 13 is screw-fed,
From the printing position provided in the center of the base 1 to the substrate support unit 3, one side of the base 1 (right side of FIG. 1)
It is configured to be moved along the guide rail 14 to the retracted position provided in the.

A cleaning unit 16 is installed on the base 1, and the cleaning unit 16 is provided on the other side of the base 1 from the central cleaning position corresponding to the printing position. An extended rail 17 for guiding to the standby position shown by the solid line in FIG. 1 and a maintenance position provided on the outer side thereof shown by the phantom line in FIG. 1 is connected to the guide rail 14. Further, an opening / closing door 18 is provided at the other end of the printing press main body 2 facing the standby position of the cleaning unit 16, and a cleaning agent accommodating portion 19 is provided near the lower portion of the standby position. .

FIG. 1 shows the appearance of the base 1, the appearance of the lifting table 4 and the cleaning unit 16 with the panel (not shown) in front of the paper removed, and the conveyor 3a,
The substrate W, the mask sheet 7, and the cross sections of the squeegee mechanism 5 and the like are shown in the drawings.

The cleaning unit 16 is shown in FIG.
As shown in FIG. 4, the cleaning head 20 is connected to a suction means such as a blower (not shown) and has a suction port including a slit 16A extending in the longitudinal direction on the upper surface.
Is installed on the support plate 21, and a cleaning agent spray nozzle 22 is provided on the side thereof. Further, the cleaning unit 23 includes a cleaning paper 23.
And a cleaning roller 24 formed by being wound in a roll shape, a winding roller 25 that winds up the cleaning paper 23 stretched from the cleaning roll 24 and stretched on the upper surface of the cleaning head 20, and the winding roller 25. A drive motor 26 including a servo motor that rotationally drives the roller 25 is provided.

A connecting cylinder 28 having a connecting rod 27 is provided at the bottom of the cleaning unit 16, and the connecting cylinder 28 and the connecting plate 29 provided on the substrate supporting unit 3 for the substrate W allow
A connecting unit is configured to connect the substrate supporting unit 3 and the cleaning unit 16 in a detachable manner. The connecting rod 27 is driven by the connecting cylinder 28,
The substrate support unit 3 and the cleaning unit 16 are integrally connected by inserting the tip end thereof into the engagement hole 30 formed in the connection plate 29.

A flange-shaped bulge 31 is formed at the base end of the connecting rod 27. As shown in FIG. 2, when the cleaning head 20 is separated from the substrate supporting unit 3 and is in the standby position, The bulging portion 31 abuts and engages with the stopper 32 provided on the base 1 so that the movement of the cleaning unit 16 to the cleaning position is restricted (FIG. 4). reference). Then, the connecting rod 27 of the connecting cylinder 28.
However, by being driven to the connecting position, the engagement state of the stopper 32 and the bulging portion 31 is released, and the movement of the cleaning unit 16 to the cleaning position is allowed.

On the base 1, as shown in FIG.
Moving direction (Y-axis direction) of the cleaning unit 16 guided by the guide rails 14 and the extension rails 17
The guide rail 33 is installed in an inclined state with respect to. Then, the first guide rail 33 and the first rail oscillatingly displaced by sliding along the first guide rail 33.
The arm 34, the rotary shaft 35 fixed to the lower end of the arm 34 and supported by the cleaning unit 16 so as to rotate integrally with the first arm 34, and the rotary force of the rotary shaft 35 are The power is transmitted to the cleaning head 20 by converting it into the driving force of the cleaning head 20, and the power is transmitted to the cleaning head 20 so as to relatively move the cleaning head 20 in the same direction (Y-axis direction) as the moving direction of the cleaning unit 16. The head driving means 37 is configured.

The power transmission part 36 includes a support rail 38 for slidably supporting the cleaning head 20 in the Y-axis direction, and a coil for urging the cleaning head 20 to push the cleaning head 20 toward the side where the rotary shaft 35 is installed. A biasing member 39 formed of a spring or the like, a second arm 40 fixed to the upper end of the rotary shaft 35, and an engagement pin 41 protruding from the cleaning head 20 are provided. Are engaged with the elongated holes 42 formed in the second arm 40.

Then, as the cleaning unit 16 moves along the guide rail 14 in the Y-axis direction,
When the first arm 34 is slidably displaced along the guide rail 33, the rotary shaft 35 is pivotally displaced, and the second arm 40 is pivotally displaced.
The cleaning head 2 is moved by the second arm 40.
0 is driven, and while the cleaning head 20 is supported by the support rail 38, the cleaning head 20 is slid and displaced by a predetermined distance in the Y-axis direction in the same direction as the moving direction of the cleaning unit 16 against the urging force of the urging member 39. Alternatively, in accordance with the urging force of the urging member 39, it is slid and displaced by a predetermined distance in the direction opposite to the moving direction of the cleaning unit 16 in the Y-axis direction.

Further, on the base 1, a locking means composed of a ball plunger 43 for releasably locking the cleaning unit 16 in the standby position and a protrusion protruding from the bottom of the cleaning unit 16 are provided. A stopper plate 45 that restricts the movement of the cleaning unit 16 to the outside of the maintenance position by contacting the portion 44.
And a regulation means consisting of.

The ball plunger 43 includes a ball body supported by a holding portion provided at an upper end portion so as to be retractable and retractable, and a biasing member made of a spring material or the like for biasing the ball body in a projecting direction. Have Then, when the cleaning unit 16 is at the standby position, the ball body of the ball plunger 43 is fitted into the recess formed on the lower surface of the cleaning unit 16, so that the cleaning unit 16 does not move in response to an external force or the like. It is locked like this.

As shown in FIG. 5, the container 19 for the cleaning agent has a container body 46 made of a bottle for storing the cleaning agent.
And a cap member 4 detachably attached to the upper end of the container body 46 by screwing or press fitting.
7 are provided. A holding base 48 for holding the container body 46 and a sensor 4 for detecting the remaining amount of the cleaning agent stored in the container body 46 are provided on the side surface of the base 1.
9 and a support bracket 51 that supports an end portion of a cleaning agent supply pipe 50 made of a flexible pipe formed of a soft plastic material or the like. Further, in the middle of the supply pipe 50, a supply pump 52 for sucking the cleaning agent in the container body 46 and supplying the cleaning agent to the spray nozzle 22 is arranged, and these constitute a cleaning agent supplying means 60.

A lead-out pipe 53 is attached to the cap member 47 so as to extend through the upper surface of the cap member 47 and hang down inside the container body 46, thereby leading out the cleaning agent in the container body 46 to the outside. ing. Further, on the upper surface of the cap member 47, the distal end portion (upper end portion) of the lead-out pipe 53 is formed.
And a connecting fitting 54 that detachably connects the end of the supply pipe 50 to the end.

The connecting fitting 54 is provided at the end portion of the supply pipe 50 and the fixing portion 55 fixed by means such as being screwed to the upper end portion 53a of the lead-out pipe 53 protruding above the cap member 47. The adapter 57 fitted to the connected fitting 56 is configured by L-shaped joints provided at both ends. The adapter part 57 of the connecting fitting 54 is provided with an insertion hole 57a into which the tip of the connecting fitting 56 is inserted. At least one of the connecting fitting 56 and the adapter part 57 is provided with a cleaning agent from both connecting parts. A first seal member (not shown) that seals so as not to leak to the outside is provided. Further, the connection fitting 56 and the adapter part 57 are provided with a second seal member and a second seal member (not shown) for preventing the cleaning agent from leaking out in the state where the connection between them is released. ing.

Then, with the container body 46 placed on the holding base 48, the adapter portion 57 of the connecting metal fitting 54 is fitted to the connecting metal fitting 56 so that the tip portion of the connecting metal fitting 56 is inserted into the insertion opening 57a. Is inserted, the connection fitting 54 and the connection fitting 56 are connected in a sealed state with one touch, and the tip of the connection fitting 56 is pulled out from the insertion opening 57a, so that the connection state is changed. It is designed to be released with one touch.

In the above structure, when applying the solder paste to the substrate W, the substrate supporting unit 3 is used.
Is set at the printing position, and the substrate W supported by the substrate supporting unit 3 is brought into contact with the back surface of the mask sheet 7 held by the frame member 8 along the front surface of the mask sheet 7. Slide the squeegee 9, 9. Then, the solder paste on the mask sheet 7 is spread and spread by the squeegees 9 to be applied on the substrate W through the pattern holes of the mask sheet 7.

When cleaning the mask sheet 7, the substrate supporting unit 3 is moved by the moving mechanism 6.
Is moved to the standby position side of the cleaning unit 16 and the engagement hole 30 of the connection plate 29 and the connection rod 27 of the connection cylinder 28 are aligned with each other. By inserting the tip of 27 into the engaging hole 30, the substrate supporting unit 3 and the cleaning unit 16 are integrally connected.

Then, by moving the substrate supporting unit 3 to the retracted position by the moving mechanism 6, the cleaning unit 16 is moved to the cleaning position. Further, after the cleaning agent is sprayed from the spray nozzle 22 onto the back surface of the cleaning paper 23 to impregnate the cleaning paper 23, the cleaning paper 23 is wound up by a predetermined amount by the winding roller 25 to set the impregnation position of the cleaning agent to the cleaning head 20. Located in the upper part of.

Next, with the cleaning paper 23 in contact with the back surface of the mask sheet 7, the air inside the cleaning head 20 is sucked by the suction means, so that the back surface of the mask sheet 7 is passed through the cleaning paper 23. The cleaning unit 16 is moved along the back surface of the mask sheet 7 while applying suction force to the side.
By moving in the axial direction, the solder paste adhering in the openings (pattern holes) formed in the mask sheet 7 is sucked to the back surface side thereof, and is wiped off sequentially by the cleaning paper 23.

Further, the cleaning head 20 is driven in the Y-axis direction by the head driving means 37 in response to the movement of the cleaning unit 16 in the Y-axis direction by the moving mechanism 6, and therefore the cleaning paper 23.
The cleaning head 20 relatively moves along the back surface of the. Therefore, the suction position of the solder paste by the cleaning unit 16 and the cleaning paper 2
The wiping position of the solder paste by 3 changes, and wiping is always performed by a new portion of the cleaning paper 23.

During the cleaning operation, the cleaning unit 16 reciprocates in the Y-axis direction along the back surface of the mask sheet, and the cleaning head 20 moves relative to the cleaning unit 16, so that the cleaning head 20 moves. Since the solder paste adheres to the cleaning paper 23 and stains over a range corresponding to the relative movement amount, the drive motor 26
Is operated to wind up the cleaning paper 23 by a length corresponding to the relative movement amount of the cleaning head 20, thereby supplying a new portion of the cleaning paper 23 onto the cleaning head 20.

When the cleaning of the mask sheet 7 by the cleaning unit 16 is completed, the moving mechanism 6 moves the cleaning unit 16 to the standby position, and then the connecting rod 27 of the connecting cylinder 28 is engaged with the connecting plate 29. The connection state between the substrate support unit 3 and the cleaning unit 16 is released by pulling out from the hole 30. In this way, the cleaning unit 1
Reference numeral 6 denotes a state in which the cleaning unit 16 is restricted from moving to the cleaning position by a restricting means including a stopper 32 provided on the base 1 and a bulging portion 31 provided on the connecting rod 27. The ball plunger 43 is locked at the standby position by the locking means.

When performing maintenance and inspection work on the cleaning unit 16, the cleaning unit 16 is pulled to the outside of the base 1 with the opening / closing door 18 open, so that the ball plunger 43 engages. After the stop state is released, the cleaning unit 16 is moved along the extension rail 17 to the maintenance position shown by the phantom line in FIG.

When it is confirmed that the remaining amount of the cleaning agent contained in the container body 46 has decreased according to the detection signal of the sensor 49, the upper end of the container body 46 is moved to the base 1
The connection state between the adapter part 57 of the connecting fitting 5 and the connecting fitting 56 is released by pulling in the direction away from the connecting fitting 56. In this way, the locked state of the upper end of the container body 46 is released, so that the container body 46 is easily taken out from the holding base 48, and then the cap member 47 is taken out from the container body 46. Supply cleaning agent inside.

When the replenishment of the cleaning agent is completed, the cap member 47 is attached to the container body 46, then these are placed on the holding base 48, and the connecting metal fitting 54 is attached.
By externally fitting and fitting the adapter part 57 of the above into the connection fitting 56, the outlet pipe 53 for the cleaning agent and the supply pipe 50 are connected via the connection fitting 54. By this connecting operation, the respective sealing functions of the second and third sealing members are released, and the internal passage of the connecting fitting 54 and the internal passage of the adapter portion 57 are brought into communication with each other. At this time, the first seal member provided on at least one of the connection fitting 56 and the adapter portion 57 prevents the cleaning agent from leaking from the connection portion.

In the screen printing machine having the cleaning unit 16 for removing the solder paste adhering to the mask sheet 6 as described above, the cleaning agent supply means 60 for supplying the cleaning agent for cleaning the mask sheet 6 is provided. A container main body 46 for accommodating the cleaning agent, a cap member 47 detachably attached to the container main body 46, and a discharge pipe 53 for leading out the cleaning agent in the container main body 46 to the cleaning agent supply unit 60. , A connecting metal fitting 54 connected to the tip of the outlet pipe 53,
With a cleaning agent supply pipe 50 provided in the printer main body 2
Since the outlet pipe 53 is detachably connected, the connecting metal fitting 54 can be detached from the cleaning agent supply pipe 50 with one touch when the cleaning agent is replenished into the container body 46.

Therefore, when the cleaning agent is replenished, the supply pipe 50 is not cracked due to a large bending force acting on the supply pipe 50. The cap member 47 and the cap member 47 can be removed together from the base 1. Then, by removing the cap member 47 from the container body 46, the cleaning agent can be replenished. Moreover, since the container body 46 and the cap member 47 can be detached from the base 1 in an integrated state as described above, the seal of the third seal member provided in the adapter portion 57 when transporting them The function has an advantage that the cleaning agent in the container body 46 can be prevented from spilling and the workability of transportation can be improved.

Further, in the above-described embodiment, since the cleaning agent supply means 60 is provided with the supply pump 52 for sucking the cleaning agent in the container main body 46 and supplying it to the spraying section (the spraying nozzle 22), the cleaning agent supplying means 60 is provided with respect to the container main body 46. Simplify the piping structure,
There is an advantage that the cleaning agent can be easily replenished.

That is, as in the conventional example shown in FIG. 7, by providing the introduction pipe 63 for supplying pressurized air into the container body 46a, the cleaning agent in the container body 46a is supplied to the supply pipe 61.
When it is configured to supply the compressed air to the spraying section, it is necessary to connect both the pressurized air introduction pipe 63 and the cleaning agent supply pipe 61 to the cap member 47a, which complicates the piping structure. In addition, correspondingly, the work of removing the cap member 47a from the container body 46a is inevitably complicated.

On the other hand, when the cleaning agent is supplied by utilizing the suction force of the supply pump 52,
Since the cleaning agent in the container body 46 can be supplied to the spraying section only by connecting only the cleaning agent supply pipe 50 to the cap member 47 by the connecting fitting 53, the piping structure can be simplified. At the same time, the work of removing the container body 46 from the base 1 can be easily performed correspondingly.

[0046]

As described above, according to the present invention, in the screen printing machine having the cleaning unit for removing the solder paste adhering to the mask sheet, the cleaning agent for supplying the cleaning agent for cleaning the mask sheet. A container main body containing a cleaning agent, a cap member detachably attached to the container main body, and a discharge pipe for discharging the cleaning agent in the container main body to the outside; A connection metal fitting connected to the tip of the outlet pipe is provided, and the supply pipe for the cleaning agent provided in the printer main body and the outlet pipe are detachably connected by the connection metal fitting, so that the container body When supplying the cleaning agent to the inside, the connecting metal fittings can be detached from the cleaning agent supply pipe with one touch, and when the cleaning agent is replenished, a large bending force acts on the supplying tube. Especially due, there is an advantage that the occurrence of a situation that the cracks in the supply pipe is formed can be prevented.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a screen printing machine according to the present invention.

FIG. 2 is an explanatory diagram showing a specific configuration of a cleaning unit.

FIG. 3 is a perspective view showing a specific configuration of a cleaning unit.

FIG. 4 is a perspective view showing a specific configuration of a connecting means and a regulating means.

FIG. 5 is an explanatory diagram showing a specific configuration of a cleaning agent supply unit.

FIG. 6 is an explanatory diagram showing a specific configuration of a connecting fitting.

FIG. 7 is an explanatory diagram showing a conventional example of a cleaning agent supply means.

[Explanation of symbols]

1 base 3 Substrate support unit 6 Moving mechanism (moving means) 7 Mask sheet 16 Cleaning unit 46 container body 47 Cap member 50 Cleaning agent supply pipe 52 Supply pump 54 Connecting bracket 60 Cleaning agent supply means

Claims (2)

[Claims] 1. A screen printing machine equipped with a cleaning unit for removing solder paste adhering to a mask sheet, comprising cleaning agent supply means for supplying a cleaning agent for cleaning the mask sheet. The means was connected to a container main body containing the cleaning agent, a cap member detachably attached to the container main body, a lead-out pipe for guiding the cleaning agent in the container main body to the outside, and a tip end of the lead-out pipe. Provided with a connecting bracket, this connecting bracket allows
A screen printing machine characterized in that a cleaning agent supply pipe provided in a main body of the printing machine and the outlet pipe are detachably connected to each other. 2. The screen printing machine according to claim 1, wherein the cleaning agent supply means is provided with a supply pump for sucking the cleaning agent in the container body and supplying it to the spraying section. .