JP2023162495A - Screen printing device and screen printing method - Google Patents

Abstract

To provide a screen printing device preventing such a situation as to make paste scraped by a mask cleaning operation adhere to a mask in the next cleaning operation: and to provide a screen printing method.SOLUTION: A screen printing device 1 performs the following operations in this order: a carry-in operation for carrying in a substrate KB and making a substrate holding part 12 hold the substrate; a contact operation for positioning the substrate KB held by the substrate holding part 12 at a mask 13 and making the substrate come in contact with the lower surface of the mask 13; a printing operation for filling paste Pst into an opening 13K of the mask 13 with which the substrate KB comes in contact, by a printing head 18; a snap-off operation for separating the substrate KB on which the paste Pst is printed from the mask 13; and a carry-out operation for carrying out the substrate KB separated from the mask 13. A mask cleaning operation is executed until the next contact operation is started after finishing the snap-off operation, and a blade cleaning operation is performed until the next snap-off operation is finished after finishing the mask cleaning operation.SELECTED DRAWING: Figure 2

Description

The present invention relates to a screen printing apparatus and a screen printing method for printing paste on a substrate using a mask in which predetermined openings are formed.

2. Description of the Related Art Screen printing apparatuses that print paste on a substrate using a mask in which predetermined openings are formed are conventionally known. In such screen printing equipment, after filling paste into the openings of the mask using a squeegee, the substrate is separated from the mask (so-called plate separation). If the next printing operation is carried out as it is, the paste will adhere to the top surface of the new board, which may lead to the manufacture of a defective board. For this reason, Patent Document 1 listed below discloses a screen printing apparatus that is equipped with a cleaning device that removes the paste that has adhered to the lower surface of the mask. This cleaning device includes a plurality of scraping members that scrape off paste attached to the bottom surface of the mask by sliding the bottom surface of the mask in a cleaning direction along the mask, and a holder that holds the plurality of scraping members. We are prepared. The plurality of scraping members are held by the holder in series with the cleaning direction.

Japanese Patent Application Publication No. 2016-196101

However, the paste that was scraped off from the mask is still attached to the scraping member used to clean the mask, and if you continue cleaning the next mask, the paste that was attached to the scraping member will instead adhere to the mask. There was a risk that the

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a screen printing device and a screen printing method that can prevent the paste scraped off during a mask cleaning operation from adhering to the mask during the next cleaning operation.

The screen printing apparatus of the present invention is a screen printing apparatus that prints paste on a substrate using a mask in which a predetermined opening is formed, and the screen printing apparatus includes a substrate holding section that holds a loaded substrate, and a substrate holding section that moves the substrate holding section. a printing head that fills the opening of the mask with which the substrate is in contact with paste and prints the paste on the substrate; a substrate that is to be printed with paste is carried in, and the substrate is moved by the printing head. After the paste has been printed, a substrate transport unit carries out the substrate separated from the mask by the substrate holder moving mechanism, and a blade scrapes the paste that has adhered to the back side of the mask due to paste filling by the printing head. a mask cleaning means for performing a mask cleaning operation to remove the paste; and a blade cleaning means for performing a blade cleaning operation for wiping off the paste scraped by the blade; the substrate is carried in by the substrate transport section and held in the substrate holding section. a carrying-in operation in which the substrate held by the substrate holder is aligned with the mask, and a contact operation in which the substrate held by the substrate holder is brought into contact with the lower surface of the mask by the substrate holder moving mechanism; A printing operation in which the paste is filled by a printing head, a plate separation operation in which the substrate on which the paste is printed is separated from the mask by the substrate holding section moving mechanism, and the substrate separated from the mask is carried out by the substrate transport section. The unloading work is performed in this order, and the mask cleaning work is performed after the plate separation work is completed and before the next contact work is started, and the blade cleaning work is performed at least in the above-mentioned manner. This is done at a time that coincides with printing work.

The screen printing method of the present invention is a screen printing method in which paste is printed on a substrate using a mask in which a predetermined opening is formed, and includes a substrate carrying step of carrying in a substrate on which paste is to be printed, and a step of carrying in the substrate. a contact step in which the substrate carried in the process is aligned with the mask and brought into contact with the lower surface of the mask; and in the contact step, the opening of the mask that the substrate was brought into contact with is filled with paste, and the paste is printed on the substrate. a printing step of separating the substrate from the mask after the printing step; a substrate carrying-out step of carrying out the substrate separated from the mask in the printing step; It includes a mask cleaning step in which the paste adhering to the lower surface of the mask is scraped off by the blade, and a blade cleaning step in which the paste scraped off by the blade in the mask cleaning step is wiped off. The mask cleaning process is performed before the contact process starts, and the blade cleaning process is performed at least at a time that overlaps with the printing process.

According to the present invention, it is possible to prevent paste scraped off during a mask cleaning operation from adhering to the mask during the next cleaning operation.

A plan view of a screen printing device according to an embodiment of the present invention A side view of main parts of a screen printing device according to an embodiment of the present invention A plan view of a mask holding section and a blade cleaning unit included in a screen printing apparatus according to an embodiment of the present invention. A plan view of a mask holding section and a blade cleaning unit included in a screen printing apparatus according to an embodiment of the present invention. (a) (b) Diagrams explaining the operation of the screen printing device in one embodiment of the present invention (a) (b) Diagrams explaining the operation of the screen printing device in one embodiment of the present invention A perspective view of a mask cleaning unit included in a screen printing apparatus according to an embodiment of the present invention A side view of a mask cleaning unit included in a screen printing apparatus according to an embodiment of the present invention An explanatory diagram of the operation of a screen printing device according to an embodiment of the present invention (a) (b) Operation explanatory diagrams of a mask cleaning unit included in a screen printing apparatus according to an embodiment of the present invention A sectional view of a mask cleaning unit included in a screen printing apparatus according to an embodiment of the present invention A perspective view showing a part of a blade cleaning unit and a part of a blade cleaning unit holding part included in a screen printing apparatus according to an embodiment of the present invention. A perspective view showing a part of a blade cleaning unit and a part of a blade cleaning unit holding part included in a screen printing apparatus according to an embodiment of the present invention. A plan view showing a part of a blade cleaning unit included in a screen printing apparatus according to an embodiment of the present invention, together with a part of a mask cleaning unit. A side view of a part of a blade cleaning unit included in a screen printing apparatus according to an embodiment of the present invention A partially sectional side view of a contact portion changing mechanism included in a screen printing apparatus according to an embodiment of the present invention (a) (b) An explanatory diagram of the operation of the contact portion changing mechanism provided in the screen printing apparatus according to an embodiment of the present invention (a) (b) (c) An explanatory diagram of the operation of the contact portion changing mechanism provided in the screen printing apparatus according to an embodiment of the present invention (a) Side view and (b) Plan view showing a part of the squeegee cleaning unit included in the screen printing apparatus according to an embodiment of the present invention together with part of the blade of the mask cleaning unit. (a) (b) (c) Schematic explanatory diagrams showing examples of paste marks formed on the wiping surface of the wiping material provided in the screen printing apparatus according to an embodiment of the present invention Process diagram of a screen printing method using a screen printing device in an embodiment of the present invention A diagram illustrating a state in which the screen printing apparatus according to an embodiment of the present invention images the state near the opening of the mask with a camera after the plate separation is performed. A diagram showing an example of an image obtained by imaging the state near the opening of the mask with a camera after the screen printing apparatus according to an embodiment of the present invention performs plate separation. A plan view showing a part of a blade cleaning unit included in a screen printing apparatus according to a first modification of an embodiment of the present invention, together with a part of a mask cleaning unit. A plan view of a mask holding section and a blade cleaning unit holding section included in a screen printing apparatus in a second modified example of an embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a screen printing apparatus 1 in one embodiment of the present invention. The screen printing device 1 is a device that constitutes a part of a component mounting line (not shown) that produces mounted boards by mounting components on a board KB, and prints a board KB sent from outside the screen printing device 1. A process (screen printing operation) consisting of a series of operations of carrying in and positioning the board, printing paste Pst such as solder on the electrode DK (FIG. 2) provided on the upper surface of the board KB, and carrying it out to the outside is repeatedly performed. .

In this embodiment, for convenience of explanation, the transport (loading and unloading) direction of the board KB is the X direction (left and right direction as seen from the worker OP), and the horizontal direction perpendicular to the X direction is the Y direction (as seen from the worker OP). (back-and-forth direction), and the up-down direction is the Z direction. In addition, in the Y direction (back and forth direction), the back direction as seen from the worker OP (upper side of the paper in FIG. 1) is the front, and the near side direction (lower side of the paper in FIG. 1) as seen from the worker OP is the rear. .

1 and 2, the screen printing apparatus 1 includes a substrate transport section 11, a substrate holding section 12, a mask 13, a mask holding section 14, a camera 15, a camera moving mechanism 16, a substrate holding section moving mechanism 17, a printing head 18, a printing A head moving mechanism 19 is provided. The screen printing apparatus 1 further includes a mask cleaning unit 21, a mask cleaning unit moving mechanism 22, a blade cleaning unit 23, and a blade cleaning unit holding section 24.

In FIG. 1, the substrate transport section 11 includes an upstream transport section 11A and a downstream transport section 11B. The upstream transport section 11A and the downstream transport section 11B are arranged side by side at positions separated from each other on both sides in the X direction when viewed from the substrate holding section 12. The upstream conveyance section 11A and the downstream conveyance section 11B are composed of a pair of conveyors C arranged side by side in the Y direction and each extending in the X direction, and drive the conveyors C to transfer the substrates KB in the X direction. transport. The substrate transport unit 11 carries out an operation of transporting the board KB before the paste Pst is printed (a board KB on which the paste Pst will be printed) to the board holding unit 12, and transporting the board KB on which the paste Pst is printed to the board holding unit 12. Carry out the work of transporting the equipment.

The substrate holding section 12 has a function of holding the substrate KB carried in by the substrate transport section 11. The substrate holder 12 holds the substrate KB in a horizontal position with the electrode DK facing upward (FIG. 2). Note that the substrate holding section 12 has a substrate moving mechanism (not shown) that moves the substrate KB in the X direction, and this substrate moving mechanism moves the substrate KB carried in from the upstream transport section 11A to the holding position. Then, the substrate KB is discharged from the holding position to the downstream transport section 11B.

In FIG. 1, the mask 13 is made of a rectangular plate-like member made of metal. The four sides of the mask 13 are supported by a mask frame 13W consisting of a rectangular frame. A plurality of openings 13K are formed in the center of the mask 13 and are arranged in accordance with the arrangement of the electrodes DK on the substrate KB.

1, 3, and 4, the mask holding section 14 includes two mask support guides 31 arranged in line in the X direction and each extending in the Y direction, and four mask support guides 31 installed in the two mask support guides 31. There are two mask fixing parts 32. As shown in FIG. 1, two sides of the mask frame 13W extending in the Y direction are placed on the two mask support guides 31, thereby supporting the mask 13 in a horizontal position.

In FIG. 1, four mask fixing parts 32 are arranged, two each on each of the two mask support guides 31, in line in the Y direction. Each mask fixing part 32 is configured to press a part of the mask frame 13W against the mask support guide 31 from above using a cylinder (not shown) and fix it to the mask support guide 31, for example. Each mask fixing part 32 can be moved in the Y direction on the mask support guide 31 so that its position can be changed according to the size of the mask 13.

In FIG. 2, the camera 15 is provided at a height between the substrate KB held by the substrate holder 12 and the mask 13. The camera 15 can acquire both upper and lower images at the same time or by switching between them. Images of the mask-side mark and the substrate-side mark captured by the camera 15 are processed in a control unit (not shown) included in the screen printing apparatus 1, and the relative position between the mask 13 and the substrate KB is calculated.

In FIG. 1, the camera movement mechanism 16 includes a Y guide 16a extending in the Y direction outside the mask holding part 14, and an X guide 16b extending in the X direction. One end of the X guide 16b is attached to the Y guide 16a, and the X guide 16b is movable along the Y guide 16a. The camera 15 is attached to the X guide 16b and is movable in the X direction along the X guide 16b.

The camera moving mechanism 16 moves the mask 13 by moving the X guide 16b in the Y direction relative to the Y guide 16a (arrow A shown in FIG. 2) and moving the camera 15 in the X direction relative to the X guide 16b. The camera 15 is moved in the horizontal plane (in the XY plane) in the lower region. As a result, the camera 15 moves horizontally into the space between the substrate KB and the mask 13, and a mark (not shown) provided on the mask 13 (mask side mark) and a mark (not shown) provided on the substrate KB (substrate side mark) ) can be imaged (FIG. 5(a)).

In FIG. 2, the substrate holder moving mechanism 17 moves the substrate holder 12 holding the substrate KB in the X direction, the Y direction, the Z direction, and the rotational direction (θ direction) within the XY plane. The substrate holder moving mechanism 17 moves the substrate holder 12 in the X, Y, and θ directions based on the relative position between the mask 13 and the substrate KB determined by the control unit, and moves the substrate KB with respect to the mask 13. The substrate holder 12 is raised with the substrate holder 12 aligned. As a result, the substrate holder 12 raises the substrate KB and brings it into contact with the lower surface of the mask 13 (FIG. 5(b)).

1 and 2, the print head 18 includes a head base 18a extending in the X direction and two squeegees 18b. The squeegee 18b is made of a plate-shaped member extending in the X direction. The two squeegees 18b are arranged to face each other in the Y direction, and the distance between them increases toward the bottom (FIG. 2). The two squeegees 18b can be raised and lowered independently with respect to the head base 18a.

In FIG. 2, the print head moving mechanism 19 moves the print head 18 with the lower end of one squeegee 18b in contact with the upper surface of the mask 13 in the Y direction (FIG. 5(b)→FIG. 6(a)). Thereby, the print head 18 scrapes up the paste Pst on the mask 13 with the squeegee 18b, fills the opening 13K of the mask 13 with the paste Pst, and prints (applies) the paste Pst on the electrode DK of the substrate KB.

When the opening 13K of the mask 13 is filled with the paste Pst, the substrate holder moving mechanism 17 lowers the substrate holder 12 to separate the substrate KB from the mask 13 (separate the plate) (as shown in FIG. 6(b)). Arrow B). When the substrate KB is separated from the mask 13, the substrate transport section 11 discharges the substrate KB to the outside.

As described above, the screen printing apparatus 1 according to the present embodiment includes a substrate holding section 12 that holds the loaded substrate KB, a substrate holding section moving mechanism 17 that moves the substrate holding section 12, and a mask that is in contact with the substrate KB. The print head 18 fills the opening 13K of the paste Pst in the opening 13K of the paste Pst and prints the paste Pst on the substrate KB, and the substrate KB on which the paste is to be printed is carried in, and after the paste Pst is printed by the print head 18, the substrate is held. The structure includes a substrate transport section 11 that carries out the substrate KB separated from the mask 13 by the section movement mechanism 17.

The mask cleaning unit 21 functions as a mask cleaning means for scraping off the paste Pst adhering to the lower surface of the mask 13 after the plate has been separated. As shown in FIG. 7, the mask cleaning unit 21 includes a blade holder 41 and a plurality of (here, four) blades 42 held by the blade holder 41. The blade holder 41 as a whole includes a frame 41a extending in the X direction and opening upward, and mask receiving parts 41b provided at both ends of the frame 41a in the X direction. The plurality of blades 42 are made of plate-shaped members extending in the X direction, and are held in the frame 41a in a state where they are lined up in parallel in the Y direction. In this embodiment, the blade 42 is made of resin, and is a member having appropriate flexibility.

Mask contact surfaces 41T (FIG. 7), which are the upper surfaces of the two mask receiving parts 41b, are parallel to the horizontal plane and are located at a relatively higher position than the upper surface of the frame body 41a (FIG. 8). The blades 42 are held by the frame 41a in an inclined position with the upper edge (edge 42E) tilted forward from a vertical position (parallel to the XZ plane) (FIGS. 7 and 8), and in this state, each blade 42 The edge 42E is positioned above the upper surfaces (mask contact surfaces 41T) of the two mask receiving portions 41b (FIG. 8).

The mask cleaning unit moving mechanism 22 functions as a mask cleaning means moving section that moves the mask cleaning unit 21 in the horizontal direction (Y direction) along the lower surface of the mask 13, and as shown in FIG. It includes a moving guide 22a extending in the Y direction from the outside of the portion 14 in the X direction, and a moving base 22b extending in the X direction. The moving base 22b is supported by the moving guide 22a and is movable in the Y direction.

The mask cleaning unit 21 (specifically, the frame 41a of the blade holder 41) is attached to the upper part of the moving base 22b. The movable base 22b has a space communicating with the internal space of the frame 41a, and the air in the internal space of the frame 41a can be sucked by a suction device 22S (FIG. 2) connected to the movable base 22b.

The movable base 22b (that is, the mask cleaning unit 21) has a standby position located outside the mask holding section 14 in the Y direction (specifically, at the rear and toward the operator OP). When performing cleaning work (mask cleaning work) in which the mask cleaning unit 21 scrapes off the paste Pst attached to the lower surface of the mask 13, the mask cleaning unit moving mechanism 22 moves the mask cleaning unit 21 located at the standby position forward. After moving, the direction is reversed and the mask cleaning unit 21 is moved backward (arrow C shown in FIG. 9).

When the mask cleaning unit 21 is moved backward (FIG. 10(a) → FIG. 10(b)), the mask cleaning unit 21 brings the edges 42E of each of the four blades 42 into contact with the lower surface of the mask 13, and The upper surface (mask contact surface 41T) of each of the mask receiving parts 41b is brought into contact with the lower surface of the mask 13. Therefore, when the mask cleaning unit 21 is moved backward by the mask cleaning unit moving mechanism 22, the four blades 42 slide on the lower surface of the mask 13, and remove the paste Pst attached to the lower surface of the mask 13 from the edge 42E. Scrape it off. While each blade 42 is in contact with the lower surface of the mask 13, it is deformed so as to be elastically bent in the direction opposite to the direction of movement (in this case, forward), thereby keeping the edge 42E in close contact with the lower surface of the mask 13. (Fig. 10(a) → Fig. 10(b)).

While the blade 42 is in contact with the lower surface of the mask 13 as described above, the pair of mask receiving parts 41b function as a stopper to prevent the blade 42 from being pressed against the mask 13 with excessive force. As a result, the elastic deformation of the blade 42 is maintained within a certain range, and the progress of wear of the blade 42 is controlled within an expected range.

While the mask cleaning unit 21 scrapes off the paste Pst attached to the lower surface of the mask 13 with the blade 42 (FIG. 10(a) → FIG. 10(b)), the air inside the frame 41a of the blade holder 41 is sucked. It is sucked by the device 22S. As a result, the paste Pst attached to the opening 13K of the mask 13 is sucked out from between the adjacent blades 42 (arrow D shown in FIGS. 10(a) and 10(b)), and the paste Pst attached to the mask 13 is removed.

In this way, the mask cleaning unit 21 of the present embodiment moves the lower part of the mask 13 in the horizontal direction parallel to the mask 13 (Y-axis direction), the paste Pst attached to the lower surface of the mask 13 is scraped off.

When the mask cleaning work by the mask cleaning unit 21 is completed, the mask cleaning unit moving mechanism 22 returns the mask cleaning unit 21 to the standby position. The mask cleaning unit 21 that has returned to the standby position separates the edges 42E of each blade 42 and the pair of mask receiving portions 41b from the mask 13.

FIG. 11 shows the mask cleaning unit 21 in a state where the edge 42E of the blade 42 is separated from the lower surface of the mask 13 after the mask cleaning operation is completed. When each blade 42 is separated from the mask 13, it elastically returns to its original undeformed shape. Then, the edge 42E of each blade 42 is positioned above the upper surfaces (mask contact surfaces 41T) of the two mask receiving portions 41b.

The blade cleaning unit 23 functions as a blade cleaning means that wipes and cleans the paste Pst scraped from the lower surface of the mask 13 by the mask cleaning unit 21 with the blade 42 during mask cleaning work. Therefore, as shown in FIGS. 3 and 4, the blade cleaning unit 23 is placed at a position corresponding to the standby position of the mask cleaning unit 21, that is, outside the mask 13 in plan view (where the mask 13 in the mask holding part 14 is installed). located at the rear of the area.

The blade cleaning unit holding section 24 functions as a blade cleaning means holding section that holds the blade cleaning unit 23 at a position corresponding to the standby position of the mask cleaning unit 21 (a position outside the mask 13 in plan view). For this reason, as shown in FIGS. 3 and 4, the blade cleaning unit holding section 24 is arranged in a region outside the mask 13 (specifically, a mask in the mask holding section 14) among the pair of mask support guides 31 constituting the mask holding section 14. 13).

3 and 4, the blade cleaning unit holding section 24 includes a partition section 51, a pair of positioning sections 52, a pair of support sections 53, a pair of guide sections 54, and a pair of hook sections 55. The partition portion 51 is a member extending in the X direction, and both ends thereof are supported by a pair of mask support guides 31.

In FIGS. 3 and 4, the pair of positioning parts 52 are provided on the rear side of both ends of the partition part 51, respectively. As shown in FIG. 12, each of the pair of positioning portions 52 is made of a block-shaped member, and an engagement hole 52H is provided in the abutted surface 52M, which is the rear surface.

3, FIG. 12, and FIG. 13, each of the pair of support parts 53 has a shape extending rearward from the partition part 51. A guide surface 53M having a slope portion that gently rises from the rear toward the front is formed on the upper surface of each support portion 53. In this embodiment, the guide portion 54 is a part of the mask support guide 31, and a guide surface 54M, which is an inner surface (the side where the pair of guide portions 54 face each other), is formed parallel to the YZ plane.

As can be seen from FIGS. 3, 4, and 12, the pair of support parts 53 are made up of a part (the part behind the partition part 51) of the pair of mask support guides 31 that constitute the mask holding part 14. . That is, in this embodiment, the blade cleaning unit holding section 24 is provided integrally with the mask holding section 14. Therefore, a structure for attaching the blade cleaning unit holding part 24 to the mask holding part 14 can be omitted, and manufacturing costs can be reduced.

3, FIG. 4, and FIG. 14, the blade cleaning unit 23 includes a wiping section 61, a wiping material moving mechanism 62, a pair of held sections 63, and a gear operating section 64. The wiping section 61 includes a base section 71, a holding section 72, a wiping material holder 73, a wiping material 74, a gear 75, and a torque limiter 76, as shown in FIGS. 14 and 15.

14 and 15, the base portion 71 is made of a plate-like member extending in the horizontal direction, and the holding portion 72 is made of a block-like member. The holding part 72 is positioned with respect to the base part 71 by coming into contact with a plurality of positioning pins 71P (FIG. 14) erected on the upper surface of the base part 71 from the side, and in this state, the holding part 72 is positioned with respect to the base part 71. It is fixed onto the base part 71 by a bolt 71B screwed into the part 71 from above.

14 and 15, the wiping material holder 73 includes a rotating shaft 73a whose one end (rear end) side is held by the holding part 72, and a disc-shaped base 73b provided at the other end (front end) side of the rotating shaft 73a. It also has a plurality of holding rods 73c extending forward from the base 73b along the direction in which the rotating shaft 73a extends. The axis 73J of the rotating shaft 73a extends in a horizontal plane in a posture inclined by an angle Θ from the direction (Y direction) perpendicular to the direction in which the blade 42 of the mask cleaning unit 21 extends (X direction) (FIG. 14). The wiping material 74 is made of, for example, a porous material and has a three-dimensional shape (cylindrical shape) with a circumferential surface (see FIG. 7).

The wiping material 74 is removably held in the wiping material holder 73 by being inserted through a plurality of holding rods 73c. The gear 75 is fixed to the rotating shaft 73a, and rotates together with the rotating shaft 73a around an axis 73J of the rotating shaft 73a. As shown in FIG. 16 (FIG. 16 is a view seen from the arrow V1-V1 shown in FIG. 14), the gear 75 has a large number of teeth (outer teeth 75T) on the outer periphery. It is inclined with respect to the axis 73J of the rotating shaft 73a. That is, the gear 75 is a helical gear in this embodiment, and the direction of the outer peripheral teeth 75T (peaks extending in the width direction) extends substantially parallel to the YZ plane (FIG. 14).

In FIGS. 14 and 15, a torque limiter 76 is provided within the holding portion 72 and limits the torque transmitted by the rotating shaft 73a. Specifically, the torque limiter 76 allows the torque to be applied to the holding portion 72 when the torque acting on the rotating shaft 73a from the wiping material 74 or the gear 75 is below a predetermined limit value (torque limit value). (the rotation of the rotating shaft 73a is prevented), and when the torque acting on the rotating shaft 73a from the gear 75 exceeds the torque limit value, the torque is prevented from being transmitted to the holding part 72 (the rotating shaft 73a is prevented from rotating). rotation of shaft 73a is allowed).

The wiping material moving mechanism 62 is a mechanical section that extends in the X direction as a whole, and moves the wiping material 74 (directly, the base portion 71) in the X direction (arrow E shown in FIG. 7). As a result, the wiping material 74 is placed at an initial position (see the wiping material 74 indicated by a solid line in FIG. 7) set at one end (right end in this case) of the blade 42 included in the mask cleaning unit 21, and The blade 42 moves between the maximum movement position (see wiping part 61 indicated by a broken line in FIG. 7) set at the other end (left end in this case) of the blade 42.

3 and 4, the pair of held parts 63 are provided extending forward from both ends of the wiping material moving mechanism 62 in the X direction. That is, the pair of held parts 63 are arranged at positions separated from each other in the wiping material movement direction (X direction), which is the movement direction of the wiping material 74 along the blade 42 included in the mask cleaning unit 21 .

In FIG. 3, a protrusion 63T that protrudes and extends inward in the X direction (to the side where the pair of held parts 63 face each other) is formed at the front end of each of the pair of held parts 63. An engagement pin 63P projects forward and extends from the contact surface 63M, which is the front surface of the protrusion 63T (see also FIGS. 12 and 14).

3, FIG. 4, and FIG. 14, the gear operation section 64 is provided on one side (here, the right held section 63) of the pair of held sections 63 included in the blade cleaning unit 23. As shown in FIG. 16, the gear operating section 64 includes a hinge 81 with a spring, a spacer 82, and a gear contact member 83.

In FIGS. 14 and 16, one blade part (fixed side blade part 81a) of the hinge 81 is fixed to the upper surface of the held part 63 in a horizontal position, and the other blade part (movable side blade part 81b) is It is swingable around the axis of the shaft portion 81c extending in the direction. The spacer 82 is attached to the lower surface side of the movable wing portion 81b of the hinge 81, and the base end side (the right end side in FIG. 16) of the gear contact member 83 is attached to the spacer 82. Therefore, the gear contact member 83 swings (raises and falls) integrally with the spacer 82 and the movable blade portion 81b using the axis of the shaft portion 81c as a fulcrum.

The spacer 82 limits the range of ups and downs of the movable wing portion 81b (and therefore of the gear contact member 83) so that the gear contact member 83 does not fall beyond the horizontal position. As a result, when no upward force is applied to the tip end 83T of the gear contact member 83, the spacer 82 comes into contact with the held part 63, as shown in FIG. It is located on the same plane as 81a. When a pushing force acts on the tip 83T of the gear contact member 83 in a horizontal position, the movable blade 81b rises around the axis of the shaft 81c (in the direction of raising the tip 83T); When the finishing force is removed, it returns to its original horizontal position due to the biasing force of the biasing spring.

14 and 16, the gear contact member 83 is provided with an opening 83K that penetrates in the Z direction (thickness direction of the gear contact member 83). When the wiping material 74 is in the initial position (FIG. 14), one of the outer teeth 75T of the gear 75 engages from below (see also FIG. 16). The opening 83K has a substantially rectangular shape in plan view, and the left side of the two sides facing each other in the X direction substantially coincides with the direction of the Y direction, that is, the direction of the outer peripheral teeth 75T of the gear 75, which is a helical gear.

As shown in FIG. 14, when the wiping material 74 is at the initial position and one of the outer peripheral teeth 75T of the gear 75 is inserted into the opening 83K of the gear contact member 83 from below (FIG. 16), The gear contact member 83 does not receive any pushing up force from the gear 75. Therefore, when the wiping material 74 is located at the initial position, the movable blade portion 81b of the hinge 81 is located on the same plane as the fixed blade portion 81a.

Here, when the wiping material 74 moves from the initial position toward the maximum movement position (FIG. 17(a) → FIG. 17(b)), the outer tooth 75T that has entered the opening 83K is in a horizontal position. It receives a force from the gear contact member 83 in a direction (rightward in this case) that prevents its movement. However, at this time, the outer tooth 75T that had entered into the opening 83K of the gear contact member 83 pushes up (raises) the tip 83T of the gear contact member 83 and leaves the opening 83K, so the gear 75 becomes a gear. It moves toward the maximum movement position without being rotated by the contact member 83 (arrow F shown in FIG. 17(b)).

On the other hand, on the contrary, when the wiping material 74 that has moved from the maximum movement position returns to the initial position (FIG. 18(a) → FIG. 18(b) → FIG. 18(c)), the returning process , one of the outer teeth 75T of the gear 75 abuts the tip 83T of the gear contact member 83 from the side (here, from the left). At this time, the outer peripheral tooth 75T presses the gear contact member 83 in the direction of collapse (direction of lowering the tip portion 83T), but because of the spacer 82, the gear contact member 83 does not displace in the direction of collapse and supports a horizontal posture. Therefore, a large reaction force G (FIG. 18(b)) from the gear contact member 83 acts on the outer peripheral tooth 75T.

The torque limit value (T0) set in the torque limiter 76 is set to a value smaller than the torque (T1) that acts on the gear 75 (ie, the rotating shaft 73a) due to the reaction force G (T0<T1). Therefore, the rotating shaft 73a rotates together with the gear 75 around the axis 73J (arrow R shown in FIG. 18(c)). The angle of the rotating shaft 73a that rotates at this time is the angle of one outer peripheral tooth 75T of the gear 75, and the wiping material 74 also rotates around the axis 73J of the rotating shaft 73a by one outer peripheral tooth 75T of the gear 75. do.

When attaching the blade cleaning unit 23 having such a configuration to the blade cleaning unit holding section 24, the pair of protrusions 63T provided on the blade cleaning unit 23 are attached to the pair of support sections 53 (guide surfaces 53M provided on the blade cleaning unit holding section 24). ). Then, in this state, the entire blade cleaning unit 23 is moved forward.

When the blade cleaning unit 23 is moved forward, the pair of engagement pins 63P of the blade cleaning unit 23 enter the pair of engagement holes 52H of the blade cleaning unit holding part 24, and the abutting surfaces of the pair of protrusions 63T, respectively. 63M comes into contact with the contact surface 52M of each of the pair of positioning parts 52 (FIG. 3→FIG. 4 and FIG. 12→FIG. 13). Thereby, the blade cleaning unit 23 is positioned in the Y direction with respect to the blade cleaning unit holding part 24.

Until the abutment surfaces 63M of the pair of protrusions 63T come into contact with the abutment surfaces 52M of the pair of positioning parts 52, the pair of held parts 63 (protrusions 63T) of the blade cleaning unit 23 each The lower surface is guided by the pair of support parts 53 (guide surfaces 53M) of the blade cleaning unit holding part 24, and positioning in the Z direction with respect to the blade cleaning unit holding part 24 is performed. Further, the side surfaces of the pair of held parts 63 (protrusions 63T) are each guided by the pair of guide parts 54 (guide surfaces 54M) of the blade cleaning unit holding part 24, and positioning in the X direction is performed.

The pair of protrusions 63T of the blade cleaning unit 23 are provided on the blade cleaning unit holder 24 until the abutting surfaces 63M abut the pair of abutted surfaces 52M of the blade cleaning unit holder 24. It comes into contact with the inclined surfaces 55M (FIG. 12) of each of the pair of hook parts 55 and elastically pushes down the hook parts 55. Then, when the lower surface of the protrusion 63T finishes passing through the inclined surface 55M at the timing when the abutment surface 63M abuts the abutted surface 52M, the hook portion 55 is released from being pressed down by the protrusion 63T and returns to its original position. do.

The hook portion 55, which has returned to its original position, engages with the back surface 63N (FIGS. 3 and 12) of the protruding portion 63T (FIGS. 12 to 13). As a result, the blade cleaning unit 23 is held (fixed) by the blade cleaning unit holding section 24. When the blade cleaning unit 23 is held by the blade cleaning unit holding section 24, the wiping material 74 of the wiping section 61 included in the blade cleaning unit 23 is positioned above the mask cleaning unit 21 in the standby position. (Figures 1 and 2).

In this way, the blade cleaning unit 23 included in the screen printing apparatus 1 according to the present embodiment includes a wiping material 74 that contacts the blade 42 included in the mask cleaning unit 21, and a wiping material 74 that contacts the blade 42 that is provided in the mask cleaning unit 21. A wiping material moving mechanism 62 that is moved in the direction (X direction) to wipe off the paste Pst scraped off by the blade 42, and a blade cleaning unit holding section that is disposed at a position apart in the direction (X direction) along the blade 42. It has a configuration including a pair of held parts 63 held by 24. The blade cleaning unit 23 is moved in a direction (Y direction) perpendicular to the direction along the blade 42 (X direction) and attached (held) to the blade cleaning unit holding section, so that the blade The cleaning unit holding part 24 includes a pair of support parts 53 that support the lower surfaces of the pair of held parts 63 (specifically, a pair of protrusions 63T) when the blade cleaning unit 23 is mounted, and It is configured to include a pair of guide parts 54 that guide the respective side surfaces of the moving held part 63.

To remove the blade cleaning unit 23 held by the blade cleaning unit holding part 24, the blade cleaning unit 23 may be pulled out rearward while pushing down the pair of hook parts 55. As described above, in the screen printing apparatus 1 according to the present embodiment, it is easy to attach and detach the blade cleaning unit 23 to and from the blade cleaning unit holding part 24.

As described above, the screen printing apparatus 1 in this embodiment includes the blade cleaning unit holding section 24 that detachably holds the blade cleaning unit 23 for wiping off the paste Pst scraped by the blade 42. Since the blade cleaning unit 23 can be easily removed from the cleaning unit holding part 24, the blade cleaning unit 23 does not become a hindrance during maintenance, inspection, etc. of the screen printing apparatus 1. Further, since the pair of held parts 63 are supported by the pair of support parts 53, the blade cleaning unit 23 can be stably held by the blade cleaning unit holding part 24.

When the blade cleaning unit 23 performs the work (blade cleaning work) of wiping off the paste Pst attached to the edge 42E of each blade 42 of the mask cleaning unit 21 after the mask cleaning work, the wiping material moving mechanism 62 The wiping part 61 located at the position is moved toward the maximum movement position. As a result, the wiping material 74 moves in the X direction, that is, in the direction in which each blade 42 extends, while being in contact with the edge 42E of each of the four blades 42, and slides on the edge 42E, so that each blade 42 touches the lower surface of the mask 13. Wipe off the paste Pst scraped off.

While the wiping material 74 is sliding on the edge 42E of the blade 42, the wiping material 74 moves as shown in FIGS. (View from arrow V2-V2 shown in the figure), the surface within a certain range centered on the projection line TS, which is the projection of the axis 73J onto the circumferential surface, of the circumferential surface of the wiping material 74 is defined as the wiping surface. Wipe off the paste Pst as 74M. In this embodiment, since the mask cleaning unit 21 includes four blades 42, the traces of paste Pst wiped off by the wiping material 74 from the four blades 42 become four parallel lines (Fig. 19 (b)). The direction in which these four parallel lines of paste Pst extend is parallel to the direction in which the blade 42 extends (Y direction), and is a direction inclined by an angle Θ from the axis 73J (projection line TS) of the rotating shaft 73a in plan view. .

In order for the wiping material 74 to slide on the edge 42E of the blade 42 as described above, the wiping material 74 must not rotate together with the rotating shaft 73a, and it is necessary to prevent the rotating shaft 73a from rotating. be. Therefore, the torque limit value (T0) set in the torque limiter 76 is determined by the rotation of the wiping surface 74M of the wiping material 74 due to the drag force from the blade 42 during blade cleaning work (when the wiping material 74 is moved). The torque is set to a value larger than the torque (T2) acting on the shaft 73a (T2<T0).

In this way, this embodiment includes the torque limiter 76 that limits the torque transmitted by the rotating shaft 73a, and the torque limiter 76 allows the wiping material 74 to be moved along the blade 42 by the wiping material moving mechanism 62. When the wiping material moving mechanism 62 moves the wiping material holder 73 to bring the gear 75 into contact with the gear contact member 83, the rotation of the rotating shaft 73a is allowed. It has become. Therefore, the torque limit value (T0) in the torque limiter 76 and one of the outer circumferential teeth 75T of the gear 75 are changed to The torque (T1) that acts on the rotating shaft 73a due to the reaction force G (FIG. 18(b)) received from the tip 83T of the contact member 83 and the drag force that the wiping material 74 receives from the blade 42 during blade cleaning work causes the rotating shaft 73a to The torque (T2) that is applied to has a relationship of T2<T0<T1.

In this embodiment, as described above, the torque limit value (T0) in the torque limiter 76 is a value larger than the torque (T2) that the rotating shaft 73a receives due to the drag force that the wiping material 74 receives from the blade 42 during blade cleaning work. (T2<T0), the rotating shaft 73a does not rotate regardless of which direction the wiping material 74 is moved in the direction in which the blade 42 extends (X direction). Therefore, during blade cleaning work, the blade cleaning unit 23 is not only used on the path of movement from the initial position to the maximum movement position (outward path), or the path of movement from the maximum movement position to the initial position (return path), but also in the outgoing path. The paste Pst can be wiped off from the blade 42 by the wiping material 74 on both return trips.

In this way, in the screen printing apparatus 1 according to the present embodiment, the paste Pst adhering to the blade 42 of the mask cleaning unit 21 is wiped off. can be prevented from adhering to the mask 13 during the next cleaning operation.

In this embodiment, the gear 75 constituting the wiping section 61 is operated by the gear contact member 83 during the outward movement in which the wiping material moving mechanism 62 moves the wiping material 74 from the initial position to the maximum movement position. It is not rotated (FIG. 17(a)→FIG. 17(b)), and the outer peripheral tooth 75T of the gear 75 comes into contact with the gear contact member 83 during the return movement from the maximum movement position to the initial position. At this time, it is rotated by the reaction force G received from the gear contact member 83 (FIG. 18(a)→FIG. 18(b)→FIG. 18(c)). At this time, the gear 75 rotates by one outer peripheral tooth 75T, so the wiping surface 74M of the wiping material 74 is placed above the circumferential surface of the wiping material 74 by a distance L corresponding to one outer peripheral tooth 75T. is moved, and the wiping surface 74M of the wiping material 74 is changed.

In this way, the blade cleaning unit 23 included in the screen printing apparatus 1 according to the present embodiment is a wiping material having a cylindrical shape (three-dimensional shape with a circumferential surface) having a rotating shaft 73a that rotates around the axis 73J. 74, a gear 75 provided on the wiping material holder 73, and a gear within the movement range of the wiping material holder 73 (here, the range between the initial position and the maximum movement position). The configuration includes a gear contact member 83 disposed at a position where it can come into contact with the gear contact member 75. When the wiping material moving mechanism 62 moves the wiping material holder 73 and the gear 75 contacts the gear contact member 83, the wiping material holder 73 rotates around the axis 73J and changes the wiping surface 74M. It is supposed to be done.

In this embodiment, the portion of the wiping material 74 that contacts the blade 42 (wiping surface 74M) can be changed by a simple operation of rotating the wiping material holder 73 about the axis 73J, and the configuration can be changed. It is possible to simplify. Furthermore, since a dedicated power source (for example, a motor, cylinder, etc.) for rotating the wiping material holder 73 is not required, the device configuration can be simplified.

In this embodiment, the wiping material holder 73, gear 75, and gear contact member 83 move the wiping material 74 diagonally across the direction (Y direction) perpendicular to the direction in which the blade 42 extends (X direction). A contact portion changing mechanism 90 changes the portion of the wiping material 74 that contacts the blade 42 (wiping surface 74M) by rotating around the axis 73J.

20(a), (b), and (c) show the formation of the wiping surface 74M of the wiping material 74 when the gear 75 is rotated by one outer tooth 75T by the gear contact member 83. This is a diagram schematically showing the state of the paste Pst trace. 20(b) shows a state in which the wiping surface 74M has moved by a distance L corresponding to one outer tooth 75T from the state in FIG. 20(a), and FIG. 20(c) shows a state in which the wiping surface 74M has moved from the state in FIG. ) shows a state in which the wiping surface 74M has moved by a distance 5L (L×5) corresponding to five outer peripheral teeth 75T.

As can be seen from FIGS. 20(a), (b), and (c), the direction in which the paste Pst marks extend on the wiping surface 74M is along the axis 73J of the rotating shaft 73a on the circumferential surface of the wiping material 74. It is inclined with respect to the direction perpendicular to the projection line TS projected onto the circumferential surface. Therefore, even if a certain wiping surface 74M and a wiping surface 74M moved by a distance L corresponding to one outer peripheral tooth 75T overlap at a part (end), a certain wiping surface 74M The trace of the paste Pst on the 74M and the paste Pst on the wiping surface 74M that has been moved by the distance L do not overlap in the end region TR (FIGS. 20(b) and 20(c)).

This is because the wiping material 74 has a three-dimensional shape (cylindrical shape) with a circumferential surface centered around the axis 73J, and by rotating around the axis 73J, the wiping surface 74M with the blade 42 is changed. In addition to being a configuration that can do this, this effect is obtained because the axis 73J of the rotating shaft 73a is inclined horizontally from the direction (Y direction) perpendicular to the direction in which the blade 42 extends (X direction).

Next, the flow of the screen printing operation (screen printing method) performed by the screen printing apparatus 1 will be explained. As shown in FIG. 21, the screen printing method using the screen printing apparatus 1 includes a substrate loading process, a contact process, a printing process, a plate separation process, and a substrate unloading process in this order, and in parallel with this, a mask cleaning process and a mask cleaning process. The blade cleaning process is executed in this order.

The substrate loading process is a process of carrying in a substrate KB on which the paste Pst is to be printed, and the substrate transporting section 11 transports (carries in) the board KB supplied from the outside of the screen printing apparatus 1. executed by The contact process is a process in which the substrate KB carried in in the substrate carrying process is aligned with the mask 13 and contacted with the lower surface of the mask 13. The substrate holder moving mechanism 17 moves the substrate KB onto the lower surface of the mask 13. This is done by making contact.

The printing process is a process in which the opening 13K of the mask 13 contacted with the substrate KB in the contact process is filled with paste Pst, and the paste Pst is printed on the substrate KB. This is performed by filling the opening 13K with the paste Pst using the printing head 18. The plate separation process is a process of performing plate separation work to separate the substrate KB from the mask 13 after the printing process. executed. The substrate unloading process is a process of performing a substrate unloading operation to unload the board KB after the printing process has been performed, and is executed by the board transport unit 11 transporting the board KB to the outside of the screen printing apparatus 1.

The mask cleaning process is a process in which a mask cleaning operation is performed in which the paste Pst attached to the lower surface of the mask 13 during the printing process is scraped off with the blade 42 of the mask cleaning unit 21. It is executed by being moved on the underside of the . The blade cleaning process is a process in which the blade cleaning unit 23 cleans the blade 42 that scraped the paste Pst from the lower surface of the mask 13 in the mask cleaning process. This is performed by moving the wiping material 74 in the direction in which the blade 42 extends.

Among the board loading process, printing process, substrate unloading process, mask cleaning process, and blade cleaning process that constitute the screen printing method in this embodiment, the substrate loading process, printing process, and substrate unloading process are objects for printing paste Pst. This process is executed in this order for each board KB. Since the mask cleaning process is performed by bringing the blade 42 into contact with the mask 13, it cannot be performed during the printing process (it cannot be performed during the blade cleaning process either). Therefore, when performing mask cleaning work every time printing of paste Pst is completed for one board KB, as shown in FIG. 21, mask cleaning work is performed after plate separation work (process) is completed. The process is executed until the next contact operation (process) is started (from the start of unloading of the board KB until the completion of loading of the next board KB).

Furthermore, since the blade cleaning work is a work (process) of cleaning the blade 42 of the mask cleaning unit 21 that scraped the paste Pst from the lower surface of the mask 13 in the mask cleaning process, it cannot be performed while the mask cleaning work is being performed. However, it will start after the mask cleaning work is completed. Blade cleaning work can be performed except while mask cleaning work is being performed, but mask cleaning work (process) and blade cleaning work can be performed every time printing of paste Pst is completed for one board KB. (Fixed), as shown in Figure 21, the blade cleaning work (process) should be completed between the end of the mask cleaning work and the end of the next plate separation work (process). Make it.

In this way, after the plate separation work (process) is completed, the mask cleaning work (process) is performed before the next contact work (process) is started, and after the mask cleaning work is completed, the next contact work (process) is started. Of course, if the blade cleaning work (process) is completed before the plate separation work (process) is finished, there is no need to stop the operation of the screen printing apparatus 1 for the mask cleaning work. There is no need to stop the operation of the screen printing apparatus 1 even for blade cleaning work (process). Therefore, according to the screen printing apparatus 1 (screen printing method) of the present embodiment, the paste Pst scraped off during the cleaning work of the mask 13 can be prevented from decreasing the productivity of the screen printing apparatus 1 (as a result, the component mounting line). It is possible to prevent a situation in which the mask 13 is attached to the next mask 13.

In the above explanation, the case where the mask cleaning work is performed every time printing of paste Pst is completed for one board KB has been explained, but the mask cleaning work (process) is performed every time one board KB is printed. This does not necessarily have to be done, and may be done every time several boards KB are printed. Alternatively, as shown in FIG. 22, the lower surface of the mask 13 immediately after the plate separation is completed is imaged by the camera 15, and the adhesion status of the paste Pst in the opening 13K is examined based on the image GZ (FIG. 23) obtained thereby. As shown in FIG. 23, if a smudge NJ or a clogged part TM is found in the opening 13K of the mask 13, this may be used as an opportunity to perform mask cleaning work, and then perform blade cleaning work. good.

(First modification)
The first deformability in this embodiment is shown. In the first modification, as shown in FIG. 24, the gear 75 included in the blade cleaning unit 23 is a spur gear instead of a helical gear. Further, the opening 83K of the gear contact member 83 has a trapezoidal shape in plan view, and the left side of the two sides facing each other in the facing diagonally. Even with such a configuration, when the wiping material moving mechanism 62 moves the wiping material holder 73 and the gear 75 contacts the gear contact member 83, the wiping material holder 73 moves along the axis 73J of the rotating shaft 73a. Since it rotates around the center, it is possible to obtain the same effect as in the embodiment described above.

(Second modification)
Next, a second modification of this embodiment will be shown. In the second modification, as shown in FIG. 25, the blade cleaning unit holding section 24 is a separate member from the mask holding section 14. That is, in the second modification, the pair of guide parts 54 extending rearward from the partition part 51 are not part of the pair of mask support guides 31. It is a member independent of the pair of mask support guides. In the configuration in which the blade cleaning unit holding section 24 is a separate member from the mask holding section 14 as in the second modification, the distance between the pair of mask support guides 31 in the Y direction changes according to the size of the board KB. This is extremely useful if the device is configured to allow the user to perform the following steps (see arrow H shown in FIG. 25).

As described above, the screen printing apparatus 1 according to the present embodiment includes a blade cleaning means (blade cleaning unit 23) for wiping off the paste Pst attached to the blade 42 of the mask cleaning unit 21. It is possible to prevent the paste Pst scraped off during the mask 13 cleaning operation from adhering to the mask 13 during the next cleaning operation.

In addition, in the screen printing apparatus 1 (screen printing method) according to the present embodiment, after the plate separation work (process) is finished, the mask cleaning work (process) is performed before the next contact work (process) is started. is executed, and the blade cleaning work (process) is completed between the end of the mask cleaning work and the end of the next plate separation work (process), so the blade cleaning work (process) is completed for the mask cleaning work. Of course, there is no need to stop the operation of the screen printing apparatus 1, and there is no need to stop the operation of the screen printing apparatus 1 for blade cleaning work (process). Therefore, it is possible to prevent the paste Pst scraped off during the cleaning work of the mask 13 from adhering to the next mask 13 while preventing a decrease in the productivity of the screen printing apparatus 1 (and by extension, the component mounting line). .

Note that this embodiment has been described as the best mode in which the blade cleaning work (process) is completed between the end of the mask cleaning work (process) and the end of the next plate separation work (process). There is no problem even if the blade cleaning operation (process) is completed later than the next plate separation operation (process). That is, in the present invention, the blade cleaning work (process) only needs to be performed at least at a time that overlaps with the printing work (process).

Although the embodiments of the present invention have been described so far, the present invention is not limited to the above-described embodiments, and various modifications and the like are possible. For example, in the embodiment described above, the wiping material 74 has a three-dimensional shape (cylindrical shape) with a circumferential surface, but this is just an example, and the shape of the wiping material 74 is not limited.

To provide a screen printing device and a screen printing method capable of preventing paste scraped off in a mask cleaning operation from being attached to the mask in the next cleaning operation.

1 Screen printing device 11 Substrate transport unit 12 Substrate holding unit 13 Mask 13K Opening 17 Substrate holding unit moving mechanism 18 Print head 21 Mask cleaning unit (mask cleaning means)
23 Blade cleaning unit (blade cleaning means)
42 Blade 61 Wiping part Pst Paste KB Board

Claims (4)

A screen printing device that prints paste on a substrate using a mask in which predetermined openings are formed,
a board holding section that holds the loaded board;
a substrate holder moving mechanism that moves the substrate holder;
a print head that prints the paste on the substrate by filling the opening of the mask that is in contact with the substrate with paste;
a substrate transport unit that carries in a substrate on which a paste is to be printed, and carries out the substrate separated from the mask by the substrate holding unit moving mechanism after the paste has been printed by the print head;
a mask cleaning means for performing a mask cleaning operation of scraping off the paste attached to the back surface of the mask with a blade due to paste filling by the printing head;
A blade cleaning means for performing a blade cleaning operation of wiping off the paste scraped by the blade,
A loading operation in which the substrate is carried in by the substrate transport unit and held by the substrate holding unit, the substrate held by the substrate holding unit is aligned with the mask, and the substrate holding unit moving mechanism is moved to the lower surface of the mask. a contacting operation in which the substrate is brought into contact with the mask, a printing operation in which the printing head fills the paste into an opening of the mask that the substrate is in contact with, and a plate separation in which the substrate on which the paste is printed is separated from the mask by the substrate holder moving mechanism. work, and a carry-out operation of carrying out the substrate separated from the mask by the substrate transport unit, are performed in this order,
In the screen printing apparatus, the mask cleaning work is performed after the plate separation work is finished and before the next contact work is started, and the blade cleaning work is performed at least at a time that overlaps with the printing work. The screen printing apparatus according to claim 1, wherein the blade cleaning operation is completed before the next plate separation operation is completed. A screen printing method in which paste is printed on a substrate using a mask in which predetermined openings are formed, the method comprising:
a board loading process of transporting the board on which the paste will be printed;
a contacting step of aligning the substrate carried in in the substrate carrying step with the mask and bringing it into contact with the lower surface of the mask;
a printing step of printing the paste on the substrate by filling the opening of the mask that was brought into contact with the substrate in the contacting step;
After the printing step, a plate separation step of separating the substrate from the mask;
a substrate unloading step of unloading the substrate separated from the mask in the plate separation step;
a mask cleaning step of scraping off the paste attached to the lower surface of the mask in the printing step with the blade;
a blade cleaning step of wiping off the paste scraped by the blade in the mask cleaning step;
including;
A screen printing method, wherein the mask cleaning step is performed after the plate separation step is completed and before the next contact step is started, and the blade cleaning step is performed at least at a time that overlaps with the printing step. 4. The screen printing method according to claim 3, wherein the blade cleaning step is completed before the next plate separation step is completed.

Images