JP7016396B2 - Screen printing machine - Google Patents

Description

The present invention relates to a screen printing machine that prints a viscous fluid on a substrate.

A screen printing machine that prints a viscous fluid at a predetermined position on a substrate when mounting a component on the substrate is known. Patent Document 1 discloses a screen printing machine in which cream solder, which is an example of a viscous fluid, is moved on a mask placed on a substrate by a squeegee and printed on the substrate through a through hole formed in the mask. There is.

JP 2011-230353

In a screen printing machine, when the cream solder that was moved when printing the first board is returned to its original position, the cream solder is printed on the mask on which the next board is installed, compared to when the first board is printed. By being moved in the opposite direction, the next board is printed. Therefore, the print quality varies depending on the printing direction, and it is difficult to stabilize the printing quality.

An object of the present invention is to provide a screen printing machine capable of printing a plurality of substrates printed by the same mask in one direction.

In order to solve the above problems, in the present invention, the viscous fluid on the mask is printed on the substrate by moving the main body frame and the mask in the first direction from the first end to the second end. A squeegee and a first guide rail provided on the main body frame so as to extend in the first direction and guide the squeegee in a second direction opposite to the first direction and the first direction. Moves the squeegee in the first direction along the first guide rail when printing the viscous fluid on the substrate, and after the squeegee finishes printing the viscous fluid on the substrate, the squeegee is printed. A squeegee moving device that moves in the second direction along the first guide rail, a recovery plate that collects the viscous fluid on the mask at the second end, and a guide rail different from the first guide rail. A second guide rail, which is provided on the main body frame in parallel with the first guide rail and guides the recovery plate in the first and second directions , is included, and the squeegee prints the viscous fluid on the substrate. The recovery plate is moved in the first direction along the second guide rail, the squeegee finishes printing the viscous fluid on the substrate, and the recovery plate collects the viscous fluid on the mask. A screen printing machine including a recovery plate moving device for moving the recovery plate in the second direction along the guide rail after recovery is realized.

With the above configuration, the screen printing machine can print in one direction, so that the printing quality is stable.

It is a figure which shows the whole structure of the screen printing machine of 1st Embodiment. It is a figure when the cover of the screen printing machine of 1st Embodiment was removed. It is the figure which looked at the screen printing machine of 1st Embodiment from the front. It is a figure which shows the solder recovery apparatus of the screen printing machine of 1st Embodiment. It is a perspective view which shows the recovery plate of the screen printing machine of 1st Embodiment. It is a block diagram which shows the electrical connection of the control device of the screen printing machine of 1st Embodiment. 7A to 7G are views showing a state at the time of one-way printing by the screen printing machine of the first embodiment. It is a flowchart which shows the process at the time of one-way printing by the screen printing machine of 1st Embodiment.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

FIG. 1 is an overall view of the screen printing machine 10 of the first embodiment. FIG. 2 is a perspective view when the cover 28 of the screen printing machine 10 according to the first embodiment of FIG. 1 is removed. FIG. 3 is a front view of the screen printing machine 10 of the first embodiment.

As shown in FIG. 1, the front-rear direction of the screen printing machine 10 is defined with the surface on which the worker panel of the screen printing machine 10 is arranged as the front surface, and the left-right direction seen from the worker is the left-right direction of the screen printing machine 10. The direction is defined as the direction, and the direction orthogonal to the front-back direction and the left-right direction is defined as the vertical direction. The vertical direction is a direction parallel to the vertical direction. The screen printing machine 10 moves the cream solder on the mask M placed on the frame along the mask M, so that the cream solder is transferred to the substrate S through the through holes formed in the printing area R of the mask M. Perform printing work (solder printing work).

The screen printing machine 10 includes a printing machine main body 12, a board transfer device 14, a board holding device 16, a mask holding device 18, a squeegee device 22, a solder recovery device 24, and the like.
As shown in FIG. 1, the printing machine main body 12 includes a main body frame 26 and a cover 28. The main body frame 26 is composed of three stages, a substrate transfer device 14 and a substrate holding device 16 are provided in the lower stage, and a mask holding device 18 is provided in the middle stage. A squeegee device 22 and a solder recovery device 24 are provided on the upper stage of the printing machine main body 12. The cover 28 covers the upper and middle stages of the main body frame 26.

The substrate transfer device 14 conveys the substrate S from the left to the right. The board transfer device 14 carries the board S to a position directly below the printing area R of the mask M, and after the solder printing work is completed, carries the board S to a mounting device (not shown). As shown in FIG. 2, the substrate transfer device 14 includes two conveyor belts 30a and 30b and a transfer motor 32 (see FIG. 6) described later. Each of the conveyor belts 30a and 30b is supported by two pulleys and is spaced apart from each other. The conveyor belts 30a and 30b are rotated by a conveyor motor 32 to convey the substrate S mounted on the conveyor belts 30a and 30b.

The substrate holding device 16 moves the substrate S conveyed directly under the print area R of the mask M in the vertical direction. The board holding device 16 includes a holding member 34 that holds the board S, and a board raising / lowering device 36 that moves the holding member 34 in the vertical direction. The board elevating device 36 moves the holding member 34 holding the board S upward during the solder printing operation, and presses the board S against the lower surface of the printing area R of the mask M arranged above.

The mask holding device 18 includes a mask frame 38 and a mask fixing cylinder (not shown). The mask frame 38 is formed in a shape that overlaps with the end portion of the mask M. The mask frame support portion is arranged above the mask frame 38, pushes down the mask frame 38 from above to bring it into contact with the mask frame support portion, and holds the mask M horizontally.

The squeegee device 22 prints the cream solder on the substrate S by moving the cream solder on the mask M along the mask M. As shown in FIGS. 2 and 3, the squeegee device 22 includes a squeegee moving device 42, a squeegee head 44, a squeegee elevating device 46a, 46b, and a squeegee 48a, 48b.
The squeegee moving device 42 includes first guide rails 50a and 50b, a first conveyor 52, a squeegee moving motor 56, and a first slider 58. The first guide rails 50a and 50b are arranged apart from each other in the left-right direction so as to be parallel to each other in the front-rear direction. The first conveyor 52 includes a first conveyor belt 60 and first pulleys 62a and 62b. The first conveyor belt 60 is an endless belt and is rotatably supported by the first pulleys 62a and 62b.

The first pulleys 62a and 62b are arranged above the first guide rail 50a so as to be at the same height as each other. The first pulley 62a is rotated by a squeegee moving motor 56 provided on the left side of the first pulley 62a. The rotation of the first pulley 62a causes the first pulley 62b to rotate, and the first conveyor belt 60 is wound between the first pulley 62a and the second pulley 62b.

The first slider 58 is formed in a long shape and is arranged so that its longitudinal direction is parallel to the left-right direction. The left end portion and the right end portion of the first slider 58 in the left-right direction are attached to the first guide rails 50a and 50b so as to be movable in the front-rear direction, respectively. Further, the left end portion of the first slider 58 is fixed to the first conveyor belt 60 so as to be relatively immovable above the attachment portion with the first guide rail 50a. Therefore, the first slider 58 is moved in the front-rear direction as the first conveyor belt 60 is rotated by the squeegee moving motor 56.

The squeegee head 44 is fixed to the center of the first slider 58. The squeegee elevating devices 46a and 46b are fixed to the squeegee head 44. The squeegees 48a and 48b are attached to the lower ends of the squeegee elevating devices 46a and 46b, respectively. The squeegees 48a and 48b are plate-shaped members having a longitudinal direction, and are attached to the squeegee elevating devices 46a and 46b so that their longitudinal directions are parallel to each other in the left-right direction. Further, the squeegees 48a and 48b are held in a state of being tilted at a predetermined angle with respect to the mask M in the lateral direction which is the direction perpendicular to the longitudinal direction.

The squeegees 48a and 48b are supported by the squeegee elevating devices 46a and 46b so as to be independently movable in the vertical direction. When the squeegee 48a is in contact with the mask M and is moved from the front end portion of the mask M toward the rear end portion of the mask M, that is, backward, the cream solder is moved backward by the squeegee 48a. Cream solder is printed on the substrate S. As shown in FIG. 2, the squeegee 48b is not moved from a state of being separated upward from the mask M and is not involved in the solder printing work. Therefore, the description of the squeegee 48b will be omitted below.

The solder recovery device 24 includes a recovery plate moving device 68, a recovery plate 72, and a scraper 74. The recovery plate moving device 68 includes second guide rails 76a and 76b, a second conveyor 78, a recovery plate moving motor 80, air cylinders 82a and 82b, and a second slider 84. The second guide rails 76a and 76b are arranged apart from each other in the left-right direction so as to be parallel to each other in the front-rear direction. The second guide rails 76a and 76b are arranged so as to be located inside and below the first guide rails 50a and 50b in the left-right direction.

The second conveyor 78 includes a second conveyor belt 86 and second pulleys 88a and 88b. The second conveyor belt 86 is an endless belt and is rotatably supported by the second pulleys 88a and 88b. The second pulleys 88a and 88b are arranged above the second guide rail 76b so as to be at the same height as each other. The second pulley 88a is rotated by a recovery plate moving motor 80 provided on the left side of the second pulley 88a. The rotation of the second pulley 88a causes the second pulley 88b to rotate, and the second conveyor belt 86 is wound between the second pulley 88a and the second pulley 88b.

The upper ends of the air cylinders 82a and 82b are attached to the second guide rails 76a and 76b so as to be movable in the front-rear direction, respectively. The air cylinder 82b is fixed to the second conveyor belt 86 so as to be relatively immovable above the attachment portion with the second guide rail 76b. Therefore, the air cylinders 82a and 82b are moved in the front-rear direction as the second conveyor belt 86 is rotated by the recovery plate moving motor 80.

FIG. 4 is a diagram showing a solder recovery device 24 in a state where the recovery plate 72 of the first embodiment is not attached.
The air cylinders 82a and 82b extend downward from the attachment portions with the second guide rails 76a and 76b, respectively, and the second slider 84 is attached to the lower end portion thereof. The air cylinders 82a and 82b move the second slider 84 in the vertical direction.
As shown in FIG. 4, the second slider 84 is a plate-shaped member arranged so that the longitudinal direction is parallel to the left-right direction. The left end portion and the right end portion in the longitudinal direction of the second slider 84 are attached to the lower ends of the air cylinders 82a and 82b, respectively. Therefore, the second slider 84 can be moved in the front-rear direction and the up-down direction.

FIG. 5 is a perspective view of the recovery plate 72 used in the screen printing machine 10 of the first embodiment as viewed from above and front.
The recovery plate 72 collects the cream solder by the squeegee 48a and moves the cream solder. As shown in FIG. 5, the recovery plate 72 is a plate-shaped member having a longitudinal direction, and is arranged so that the longitudinal direction thereof is parallel to the left-right direction. The length of the recovery plate 72 in the longitudinal direction is formed to be shorter than the length of the second slider 84 in the longitudinal direction. The width of the recovery plate 72 in the front-rear direction is formed to be larger than the width of the second slider 84 in the front-rear direction. Therefore, the recovery plate 72 is placed so as to cover the upper surface of the second slider 84.

A horizontal plane 92 and slopes 94a and 94b are formed on the recovery plate 72. The slope 94a is a slope that extends from the rear end in the front-rear direction of the horizontal plane 92 and is inclined downward from the horizontal plane 92 so as to be located downward as it goes backward. The slope 94b is a slope that extends from the front end of the horizontal plane 92 and is inclined downward from the horizontal plane 92 so as to be located downward as it goes forward.
A guide groove 95 extending in parallel in the left-right direction is formed at the boundary portion between the horizontal plane 92 and the slope 94a. The length of the guide groove 95 in the left-right direction is formed to be longer than the length of the squeegee 48a in the left-right direction. Support portions 96a and 96b are fitted into the guide groove 95, and the guide groove 95 holds the support portions 96a and 96b so as to be movable in the left-right direction.

The scraper 74 collects the cream solder remaining on the mask M after the cream solder is moved on the mask M by the squeegee 48a. As shown in FIG. 5, the scraper 74 includes support portions 96a and 96b and scraping portions 98a and 98b. The support portions 96a and 96b are fitted into the guide groove 95 so as to be movable in the left-right direction. The support portions 96a and 96b are extended downward.
The scraping portions 98a and 98b are fixed to the tips of the support portions 96a and 96b, respectively. The scraping portions 98a and 98b have an inclined surface located outside the squeegee 48a in the left-right direction as the scraping portion 98a and 98b move forward. The tips of the scraping portions 98a and 98b are arranged so as to be located below the lower end of the slope 94a. Therefore, when the recovery plate 72 is brought into contact with the mask M, the scraping portions 98a and 98b come into contact with the mask M before the recovery plate 72.

FIG. 6 is a block diagram showing an electrical connection of the control device 100 of the screen printing machine 10. The control device 100 includes a CPU, ROM, RAM, a ROM that can be temporarily stored, a communication interface, and the like, and performs various controls by executing a program recorded in the ROM on the CPU. As shown in FIG. 6, the control device 100 includes a transfer motor 32, a substrate elevating pump 104, a mask fixing pump 106, a squeegee elevating pump 108a, 108b, a squeegee moving motor 56, and a recovery plate moving motor 80 via a drive circuit 102. , The recovery plate elevating pump 110, the squeegee position sensors 112a and 112b, and the recovery plate position sensor 114.

The substrate elevating pump 104, the mask fixing pump 106, the squeegee elevating pumps 108a and 108b, and the recovery plate elevating pump 110 drive the substrate elevating device 36, the mask fixing cylinder, the squeegee elevating devices 46a and 46b, and the air cylinders 82a and 82b, respectively. It is a thing. The squeegee position sensors 112a, 112b and the recovery plate position sensor 114 detect the positions of the squeegee 48a, 48b and the recovery plate 72 in the front-rear direction and the vertical direction, respectively.

The solder printing operation by the screen printing machine 10 having the above configuration will be described. 7A to 7G are a series of views showing a state at the time of one-way printing by the screen printing machine 10.
First, the operator attaches the mask M to the mask holding device 18 in preparation for the solder printing work. Subsequently, the operator removes the recovery plate 72 from the second slider 84, moves the support portions 96a and 96b of the scraper 74 in the left-right direction, and between the inner ends of the scraping portions 98a and 98b in the left-right direction. The distance is adjusted to be longer than the length of the squeegees 48a and 48b in the longitudinal direction. After that, the operator puts a predetermined amount of cream solder on the recovery plate 72 and attaches it to the second slider 84.

When the preparation for the solder printing work by the operator is completed, the board S is carried onto the board holding device 16 by the board transfer device 14, and the board S is pressed against the printing area R of the mask M by the board holding device 16.
As shown in FIG. 7A, the squeegee 48a is placed in front of the cream solder on the recovery plate 72. At this time, the squeegee 48a is in contact with the upper surface of the recovery plate 72. Then, as shown in FIG. 7B, the rearward movement of the squeegee 48a causes the cream solder on the recovery plate 72 to be moved rearward and dropped onto the mask M in front of the front end of the print area R. Therefore, before the squeegee 48a enters the print area R of the mask M, the recovery plate 72 is arranged in front of the squeegee 48a, that is, on the front end side of the mask M with respect to the squeegee 48a.

Subsequently, as shown in FIG. 7C, the squeegee 48a is moved backward in a state of being in contact with the mask M. As a result, the cream solder is moved backward on the printed area R along the mask M, and is printed on the substrate S through the through hole formed in the printed area R on the substrate S. When the squeegee 48a is moved backward, the recovery plate 72 is moved backward so as to follow the squeegee 48a in contact with the mask M. While the recovery plate 72 follows the squeegee 48a, the scraping portions 98a and 98b of the scraper 74 are moved backward while being in contact with the mask M, and the cream solder protruding outward from the squeegee 48a in the left-right direction. Scrap up.

The squeegee 48a is moved rearward until it crosses the rear edge of the print area R. Then, as shown by the alternate long and short dash line in FIG. 7D, the recovery plate 72 is moved to a position higher than the cream solder, and the squeegee 48a is moved to a position higher than the recovery plate 72. In this state, the recovery plate 72 is moved backward until it overtakes the squeegee 48a. As a result, the recovery plate 72 is located behind the squeegee 48a, as shown by the solid line in FIG. 7D. Therefore, after the squeegee 48a moving rearward has crossed the print area R of the mask M, the recovery plate 72 is arranged behind the squeegee 48a, that is, on the rear end side of the mask M with respect to the squeegee 48a.
Subsequently, as shown in FIG. 7E, the squeegee 48a and the recovery plate 72 are moved downward until they abut on the mask M.

Next, as shown in FIG. 7F, the squeegee 48a is further moved rearward, and the cream solder is placed on the recovery plate 72. After that, the squeegee 48a and the recovery plate 72 are moved upward and separated from the mask M. Subsequently, the squeegee 48a and the recovery plate 72 are moved forward while maintaining the front-back positional relationship as shown in FIG. 7G. The squeegee 48a and the recovery plate 72 are moved to the front end of the mask M, then lowered onto the mask M and returned to the state shown in FIG. 7A. After that, the printed substrate S is moved downward by the substrate holding device 16 and separated from the mask M. Subsequently, the substrate transfer device 14 carries out the substrate S for which printing has been completed, and then carries in the substrate S for printing.

Hereinafter, specific control during solder printing work will be described. FIG. 8 is a flowchart showing a process executed by the control device 100 during the solder printing operation. The control device 100 starts the process by the flow after the recovery plate 72 on which the cream solder is placed is set on the second slider 84 by the operator.
In step 1 (hereinafter, abbreviated as “S1”; the same applies to the other steps), the control device 100 drives the transfer motor 32 to transfer the substrate S onto the holding member 34. Next, in S3, the control device 100 drives the substrate elevating pump 104, moves the substrate S upward, and presses it against the lower surface of the print area R of the mask M. After that, in S5, the control device 100 drives the squeegee lifting pump 108a and moves the squeegee 48a downward until it comes into contact with the recovery plate 72.

In S7, the control device 100 supplies an electric current to the squeegee moving motor 56 until the squeegee 48a is located behind the recovery plate 72, and moves the squeegee 48a rearward.
In S9, the control device 100 supplies current to the squeegee moving motor 56 and the recovery plate moving motor 80 until the squeegee 48a and the recovery plate 72 are located behind the front end of the print area R. In S11, the control device 100 refers to the value of the squeegee position sensor 112a and determines whether or not the value indicating the position of the squeegee 48a exceeds the value indicating the position of the rear end of the preset print area R. .. If the squeegee 48a exceeds the rear end of the print area R, the process proceeds to S13, and if not, S11 is repeated.

In S13, the control device 100 drives the recovery plate elevating pump 110 until the recovery plate 72 is located above the cream solder. Subsequently, the squeegee lifting pump 108a is driven until the squeegee 48a is located above the recovery plate 72. Next, in S15, the control device 100 supplies a current to the recovery plate moving motor 80 until the recovery plate 72 is located behind the squeegee 48a. In S17, the control device 100 drives the squeegee elevating pump 108a and the recovery plate elevating pump 110 until the squeegee 48a and the recovery plate 72 abut on the mask M. Subsequently, in S19, the control device 100 supplies a current to the squeegee moving motor 56 until the squeegee 48a rides on the upper surface of the recovery plate 72.

In S21, the control device 100 drives the squeegee lift pump 108a and the recovery plate lift pump 110 until the squeegee 48a and the recovery plate 72 are separated upward from the mask M. After that, the control device 100 supplies a current to the squeegee moving motor 56 and the recovery plate moving motor 80 until the squeegee 48a and the recovery plate 72 are located at the front end of the mask M. In S23, the control device 100 drives the board lifting pump 104 to move the board S downward, and drives the transfer motor 32 to carry the board S out to the mounting device. In S25, the control device 100 determines whether or not the current board S is the last board to be printed. If the current substrate is not the last substrate, the process returns to S1, and if it is the last substrate, the flow processing is terminated.

As described above, in the screen printing machine 10 of the present embodiment, when the squeegee 48a is between the front end of the mask M and the front end of the printing area R, the recovery plate 72 is arranged in front of the squeegee 48a. As a result, printing can be started without exchanging the positions of the squeegee 48a and the recovery plate 72.
Further, after the squeegee 48a has crossed the rear end of the print area R, the recovery plate 72 passes between the squeegee 48a and the cream solder, thereby minimizing the vertical movement of the recovery plate 72 and the recovery plate 72. Can be placed behind the squeegee 48a. As a result, the cream solder can be recovered on the recovery plate 72 by moving the squeegee 48a to the rear.

Further, the cream solder recovered on the recovery plate 72 is returned to the front end of the mask M while being placed on the recovery plate 72. Therefore, the cream solder is not moved forward on the mask M, but is moved only backward. That is, the screen printing machine 10 can print a plurality of substrates in one direction. As a result, it is possible to suppress variations in printing quality due to differences in printing directions.
Further, since the scraper 74 is provided not on the squeegee 48a but on the recovery plate 72, it is not necessary to change the height of the scraper 74 in accordance with the change in the height of the squeegee 48a. Therefore, the work can be simplified.
Further, since the scraper 74 is arranged outside the squeegee 48a in the left-right direction, the cream solder protruding outside the squeegee 48a in the left-right direction can be collected on the recovery plate 72.

The cream solder in this embodiment is an example of a viscous fluid, and the recovery plate 72 is an example of a recovery member. The front end of the mask M is an example of the first end, and the rear end of the mask M is an example of the second end. The direction from the front end to the rear end of the mask M is an example of the first direction, and the direction from the rear end to the front end of the mask M is an example of the second direction. The squeegee lifting pumps 108a and 108b, the squeegee moving motor 56, the recovery plate moving motor 80, and the recovery plate lifting pump 110 are examples of the drive unit, and the control device 100 is an example of the control unit.

Although the aspects of the present invention have been described above, the present invention is not limited to the above-mentioned aspects, and various modifications can be made without departing from the gist of the present invention.
In the present embodiment, as shown in FIG. 7B, the squeegee 48a is moved backward to lower the cream solder from the recovery plate 72 onto the mask M, but the present invention is not limited to this, and for example, the recovery plate 72 is moved forward. You may move the cream solder by moving it to.
Further, as shown in FIG. 7E, the squeegee 48a is moved backward to collect the cream solder on the recovery plate 72, but the present invention is not limited to this. For example, the recovery plate 72 is moved forward to collect the cream solder. May be.

Further, as shown in FIG. 7D, after printing is completed, the recovery plate 72 is arranged at a position higher than the cream solder and lower than the squeegee 48a and moved backward, but the present invention is not limited to this, and for example, the recovery plate 72 is used. May be moved rearward at a position higher than the squeegee 48a.
Further, in the present embodiment, the recovery plate 72 arranged in front of the squeegee 48a overtakes the squeegee 48a and is arranged behind the squeegee 48a. The timing of this overtaking is shown in FIG. 7D. It is not limited to the timing shown. The overtaking of the squeegee 48a of the recovery plate 72 is performed at any timing between the time when the cream solder is dropped from the recovery plate 72 onto the mask M and the time when the cream solder is collected from the recovery plate M onto the recovery plate 72. The recovery plate 72 may be overtaken, for example, immediately after the cream solder is dropped from the recovery plate 72 onto the mask M, or when the squeegee 48a is moving in the print area R of the mask M. Is also good.

10: Screen printing machine 12: Printing machine main body 14: Board transfer device 16: Board holding device 18: Mask holding device 22: Squeegee device 24: Solder recovery device 26: Main body frame 28: Cover 30a, 30b: Conveyor belt 32: Conveyance Motor 34: Holding member 36: Board elevating device 38: Mask frame 42: Squeegee moving device 44: Squeegee head 46a, 46b: Squeegee elevating device 48a, 48b: Squeegee 50a, 50b: First guide rail 52: First conveyor 56: Squeegee moving motor 58: 1st slider 60: 1st conveyor belt 62a, 62b: 1st pulley 68: Recovery plate moving device 72: Recovery plate 74: Scraper 76a, 76b: 2nd guide rail 78: 2nd conveyor 80: Recovery Plate moving motors 82a, 82b: Air cylinder 84: Second slider 86: Second conveyor belt 88a, 88b: Second pulley 92: Horizontal plane 94a, 94b: Slope 95: Guide groove 96a, 96b: Support portion 98a, 98b: Scratch Take part 100: Control device 102: Drive circuit 104: Board elevating pump 106: Mask fixing pump 108: a, 108b: Squeegee elevating pump 110: Recovery plate elevating pump 112a, 112b: Squeegee position sensor 114: Recovery plate position sensor M: Mask R: Print area S: Substrate

Claims (3)

With the main body frame
A squeegee for printing the viscous fluid on the mask onto the substrate by moving in the first direction from the first end to the second end of the mask.
The squeegee includes a first guide rail provided on the main body frame so as to extend in the first direction and guides the squeegee in the first direction and a second direction opposite to the first direction, and the squeegee is the viscous fluid . The squeegee is moved in the first direction along the first guide rail when printing on the substrate, and the squeegee is printed on the substrate after the squeegee finishes printing the viscous fluid on the substrate. A squeegee moving device that moves in the second direction along the rail ,
A recovery plate for recovering the viscous fluid on the mask at the second end ,
A guide rail different from the first guide rail, including a second guide rail provided on the main body frame in parallel with the first guide rail and guiding the recovery plate in the first direction and the second direction . When the squeegee prints the viscous fluid on the substrate, the recovery plate is moved in the first direction along the second guide rail, and the squeegee finishes printing the viscous fluid on the substrate. A screen printing machine comprising a recovery plate moving device that moves the recovery plate in the second direction along the guide rail after the recovery plate collects the viscous fluid on the mask . The screen printing machine according to claim 1, wherein the second guide rail is provided inside the first guide rail in a second direction orthogonal to the first direction in a horizontal plane. The second guide rail is a pair of guide rails provided apart from each other in a second direction orthogonal to the first direction in a horizontal plane.
The recovery plate is attached to each of the pair of second guide rails and is arranged at the lower end of a pair of air cylinders extending downward.
The screen printing machine according to claim 1 or 2, wherein the length of the squeegee extending in the second direction is shorter than the distance between the pair of air cylinders in the second direction.

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