Paste film forming equipment and component mounting equipment

Abstract

An object of the present invention is to provide a paste film forming device and a component mounting device that can smoothly scrape paste using a paste scraping section. [Solution] A paste film forming device 14 includes a table 25 to which paste Pst is supplied, a paste scraping unit 28 that moves relative to the table 25 to scrape together the paste Pst supplied to the table 25, and a squeegee 29 that is disposed opposite the paste scraping unit 28 and moves relative to the table 25 to level the paste Pst scraped by the paste scraping unit 28 to form a paste film PM. The paste scraping unit 28 includes a plate-shaped scraper 32 and a scraper holder 31 that holds the scraper 32, and the scraper 32 is held by the scraper holder 31 so that its lower edge 32K is obliquely positioned closer to the squeegee 29 than its upper edge 32J.

Description

[Technical Field]

[0001] The present disclosure relates to a paste film forming device that moves a squeegee relative to a table to form a paste film, and a component mounting device including the same. [Background technology]

[0002] The paste film forming device provided in the component mounting device is configured to scrape the paste supplied to the table by moving a paste scraping unit relative to the table, and then level the scraped paste with a squeegee to form a paste film of a certain thickness on the upper surface of the table (for example, Patent Document 1). After the component mounting device has formed a paste film with the paste film forming device, the mounting head brings the picked-up component into contact with the paste film, transfers the paste to the underside of the component, and then mounts it on the substrate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-108884 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the scrapers (squeegees) provided in conventional paste scraping units are often made of rubber such as urethane rubber and are installed in an almost perpendicular position to the top surface of the table, which creates a problem in that the large friction between them and the top surface of the table makes it difficult to smoothly scrape the paste supplied to the top surface of the table.

[0005] Therefore, an object of the present disclosure is to provide a paste film forming apparatus and a component mounting apparatus that can smoothly scrape the paste using a paste scraping section. [Means for solving the problem]

[0006] The paste film forming device of the present disclosure comprises a table to which paste is supplied, a paste scraping section that moves relative to the table to scrape the paste supplied to the table, and a squeegee that is arranged opposite the paste scraping section and moves relative to the table to level the paste scraped by the paste scraping section to form a paste film, the paste scraping section comprising a plate-shaped scraper and a scraper holder that holds the scraper, and the scraper is held by the scraper holder so that its lower edge is at an angle closer to the squeegee than its upper edge.

[0007] The component mounting device of the present disclosure includes the paste film forming device of the present disclosure described above, and a mounting head that attaches components to the paste film formed by the paste film forming device and then mounts them on a substrate. [Effects of the Invention]

[0008] According to the present disclosure, the paste scraping section can smoothly scrape the paste. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a plan view of a portion of a component mounting device according to an embodiment of the present disclosure. [Figure 2] 1 is a perspective view of a paste film forming apparatus according to an embodiment of the present disclosure. [Figure 3] 1 is a side cross-sectional view of a portion of a paste film forming apparatus according to an embodiment of the present disclosure. [Figure 4] 1A and 1B are side cross-sectional views of a portion of a paste film forming apparatus according to an embodiment of the present disclosure. [Figure 5] 1 is a perspective view of a portion of a paste film forming apparatus according to an embodiment of the present disclosure. [Figure 6] 1 is an exploded perspective view of a portion of a paste film forming apparatus according to an embodiment of the present disclosure. [Figure 7]1 is an exploded perspective view of a paste scraping unit included in a paste film forming apparatus according to an embodiment of the present disclosure. FIG. [Figure 8] 1 is a side cross-sectional view of a portion of a paste film forming apparatus according to an embodiment of the present disclosure. [Figure 9] FIG. 2 is a perspective view of a squeegee constituting the paste film forming apparatus according to the embodiment of the present disclosure. [Figure 10] FIG. 2 is a block diagram showing a control system of the component mounting device according to the embodiment of the present disclosure. [Figure 11] 1A, 1B, and 1C are explanatory diagrams illustrating the operation of a paste film forming device according to an embodiment of the present disclosure. [Figure 12] 1A, 1B, and 1C are explanatory diagrams illustrating the operation of a paste film forming device according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Fig. 1 shows a component mounting device 10 according to one embodiment of the present disclosure. The component mounting device 10 is a device that mounts components BH on a substrate KB, and includes a base 11, a transport conveyor 12, multiple part feeders 13, a paste film forming device 14, a head moving mechanism 15, and a mounting head 16. For ease of explanation, the left-right direction of the component mounting device 10 as seen from the operator OP is defined as the X direction, and the front-to-back direction of the component mounting device 10 as seen from the operator OP is defined as the Y direction. The up-down direction is defined as the Z direction.

[0011] 1, the transport conveyor 12 supports both Y-direction ends of the board KB from below, transports it in the X direction, and positions it at a predetermined work position. Each part feeder 13 is detachably attached to a feeder base 11F connected to the Y-direction end of the base 11. Each part feeder 13 supplies parts BH to a part pick-up position 13T set at the end on the far side (the transport conveyor 12 side) as seen from the worker OP.

[0012] 1, head moving mechanism 15 includes fixed beam 15a extending in the Y direction and moving beam 15b extending in the X direction. Both ends of fixed beam 15a are fixed to base 11. One end of moving beam 15b is attached to fixed beam 15a, and is moved in the direction along fixed beam 15a (Y direction) by a drive mechanism (not shown).

[0013] 1, the mounting head 16 is attached to a moving beam 15b and is moved in the direction (X direction) along the moving beam 15b by a drive mechanism (not shown). The mounting head 16 is movable in a horizontal plane (XY plane) in the space above the base 11 by the movement of the moving beam 15b in the Y direction relative to the fixed beam 15a and the movement of the mounting head 16 itself in the X direction relative to the moving beam 15b.

[0014] The mounting head 16 is equipped with a plurality of nozzles 16a extending downward. The mounting head 16 generates a vacuum suction force at the bottom end of each nozzle 16a, thereby suctioning and picking up the component BH supplied to the component removal position 13T by the part feeder 13 onto the nozzle 16a.

[0015] The paste film forming device 14 is a device for transferring a paste Pst, such as solder paste, onto the underside of a component BH picked up by the nozzle 16a of the mounting head 16. As shown in FIG. 2, the paste film forming device 14 has a base 22 on the upper surface of a connection portion 21 that is detachably connected to the feeder base 11F, and a table 25 is provided on the upper surface of the base 22 via a slider 24. As shown in FIG. 2, a pair of guides 23 extending in the Y direction are provided on the upper surface of the base 22 facing each other in the X direction, and the slider 24 is slidable in the Y direction along the pair of guides 23. Therefore, the table 25, together with the slider 24, is movable in the Y direction above the base 22.

[0016] 2 and 3, a motor 26 is provided on the upper surface of the base portion 22. A ball screw 27 extending in the Y direction is connected to the drive shaft of the motor 26, and the ball screw 27 is threaded from the front side into a female screw portion (not shown) extending in the Y direction within the slider 24. Therefore, when the motor 26 is operated to rotate the ball screw 27, the slider 24 (and therefore the table 25) moves in the Y direction. The motor 26 can switch the rotation direction of the ball screw 27 to move the table 25 back and forth between a rear position (FIG. 4(a)) and a front position (FIG. 4(b)).

[0017] 5 and 6, table 25 has a rectangular shape in a plan view. A pair of side walls 25a extending in the Y direction are formed at the X-direction end of table 25. A rear wall 25b extending in the X direction is formed at the rear end in the Y direction, and a front wall 25c extending in the X direction is formed at the front end in the Y direction. An upper surface 25d of table 25 serves as a flat paste supply surface onto which paste Pst is supplied.

[0018] 2, the base portion 22 is provided with a paste scraping portion 28 and a squeegee 29. A cover member 30 is detachably attached to the top of the base portion 22.

[0019] 5 and 6, the paste scraping unit 28 includes a scraper holder 31 having a shape extending in the X direction as a whole, and a flat scraper 32. As shown in Fig. 7, the scraper 32 has a long rectangular shape extending in the X direction as a whole, with an upper edge 32J and a lower edge 32K parallel to each other.

[0020] In Figure 7, a scraper holder 33 is attached to the underside of the scraper holder 31 by a plurality of screws 31S. The scraper 32 is detachably attached to the scraper holder 31 by having its upper edge sandwiched between the scraper holder 31 and the scraper holder 33. When attached to the scraper holder 31, the scraper 32 is in an oblique position with its lower edge 32K protruding toward the rear (Figures 3 and 4(a) and (b)). In other words, the scraper 32 is held by the scraper holder 31 in an oblique position (tilted position) in which the lower edge 32K is closer to the squeegee 29 than the upper edge 32J.

[0021] 5, the dimension in the X direction of paste scraping unit 28 (more specifically, scraper holder 31) is larger than the dimension in the X direction of table 25, and a pair of holder support parts 34 provided at both ends thereof are each positioned outside side wall 25a of table 25. The pair of holder support parts 34 are each attached to base part 22, so that paste scraping unit 28 as a whole is fixed relatively to base part 22.

[0022] In this embodiment, the scraper 32 included in the paste scraping unit 28 is made of a flexible material (for example, a resin material made of engineering plastic). The lower edge 32K of the scraper 32 abuts against the upper surface 25d of the table 25 from above, and is bent into a downwardly convex shape in a side view seen from the X direction (FIG. 8).

[0023] When replacing the scraper 32 with respect to the scraper holder 31, the screws 31S are loosened and the scraper 32 is pulled out from between the scraper holder 31 and the scraper holder 33. A new scraper 32 is then inserted between the scraper holder 31 and the scraper holder 33, and the screws 31S are tightened. As shown in FIG. 7 , a step 33D extending in the X direction is provided on the top surface of the scraper holder 33 (the surface facing the scraper holder 31). When attaching a new scraper 32, the upper edge 32J of the scraper 32 is brought into contact with this step 33D, thereby enabling the scraper 32 to be positioned relative to the scraper holder 33 (and therefore the scraper holder 31).

[0024] 7, the scraper 32 has a symmetrical shape with respect to the central axis 32AX parallel to the lower edge 32K. Therefore, when attaching the scraper 32 to the scraper holder 31, any one of the upper edge 32J side and the lower edge 32K side of the scraper 32 at that time can be sandwiched between the scraper holder 31 and the scraper pressing part 33.

[0025] 5 and 6, squeegee 29 has a shape that extends in the X direction, and is disposed on the rear side of paste scraping portion 28. A film forming portion 41 that extends downward and has a tapered lower end is formed in the center of squeegee 29 (FIGS. 8 and 9).

[0026] 9, a pair of block-shaped squeegee ends 42 are formed on both ends of the squeegee 29. The pair of squeegee ends 42 are located outside the side wall 25a of the table 25 and are attached to the base portion 22 (FIGS. 5 and 6). Therefore, the entire squeegee 29 is fixed relative to the base portion 22.

[0027] In Figure 8, the surface of the squeegee 29 on the front side of the film-forming unit 41 (the surface facing the paste scraping unit 28) is the film-forming surface 41M (see also Figure 9). The squeegee 29 can be moved in the Z direction (up and down direction) by a squeegee lifting unit 29M (Figure 8), which is made up entirely of a cylinder or the like. Therefore, the gap GP, which is the distance (distance in the Z direction) between the lower end of the squeegee 29 and the upper surface 25d of the table 25, can be changed as desired. This gap GP determines the thickness of the paste film PM formed on the upper surface 25d of the table 25, as will be described later.

[0028] 2, the cover member 30 is provided to cover a portion of the upper part of the table 25. The cover member 30 has a top plate portion 51 and a pair of side plate portions 52 extending downward from both ends of the top plate portion 51 in the X direction. The pair of side plate portions 52 are detachable from the base portion 22.

[0029] 10, a control unit 10C provided in component mounting device 10 controls transport conveyor 12, multiple part feeders 13, paste film forming device 14, head moving mechanism 15, and mounting head 16. Specifically, control unit 10C controls transport conveyor 12 to transport and position board KB, and controls each part feeder 13 to supply components BH to component removal position 13T. It also controls head moving mechanism 15 to move mounting head 16, and controls mounting head 16 to have each nozzle 16a pick up (pick up) components BH.

[0030] The control unit 10C also controls the motor 26 and the squeegee lifting / lowering unit 29M that constitute the paste film forming device 14 to form a paste film PM on the upper surface 25d of the table 25 in the following manner. When forming a paste film PM on the upper surface 25d of the table 25, the control unit 10C first operates the motor 26 to position the table 25 to the front side (FIG. 4(a) → FIG. 4(b)). Then, the control unit 10C supplies paste Pst to the area between the paste scraping unit 28 and the squeegee 29 using a separately prepared syringe SG (FIG. 11(a)).

[0031] After supplying the paste Pst to the area between the paste scraping section 28 and the squeegee 29, the control section 10C lowers the squeegee 29 (arrow A shown in Figure 11(b)) and adjusts the distance (gap GP) between the lower end of the squeegee 29 and the upper surface 25d of the table 25 so that the gap GP matches the thickness of the paste film PM to be formed (Figure 11(b)).

[0032] After adjusting the gap between the lower end of the squeegee 29 and the upper surface 25d of the table 25, the motor 26 is operated to move the table 25 toward the rear (arrow B shown in FIG. 11(c)). While the table 25 is moving toward the rear, the squeegee 29 moves relative to the table 25, causing the film forming unit 41 to scrape the paste Pst toward the front wall 25c, and a paste film PM of a constant thickness corresponding to the gap GP is formed on the upper surface 25d of the table 25 (FIG. 11(c)).

[0033] Once the paste film PM has been formed on the upper surface 25d of the table 25, the mounting head 16 contacts the underside of the component BH held by the nozzle 16a (arrow C) in FIG. 12(a) to transfer the paste Pst to the component BH. Note that the thickness of the paste film PM is kept constant, so that an accurate amount of paste Pst is transferred to the underside of the component BH.

[0034] When the components BH come into contact with the paste film PM and the paste Pst is transferred to the components BH, the paste film PM will have portions where its thickness is not constant (where its thickness is small). For this reason, the paste film forming device 14 must re-form (re-form) the paste film PM every time a predetermined number of components BH transfer the paste Pst.

[0035] When the paste film PM is to be reformed, the paste film forming device 14 raises the squeegee 29 (arrow D in FIG. 12(b)) and then operates the motor 26 to move the table 25 toward the rear (arrow E in FIG. 12(c)). As a result, the table 25 is positioned at the front side, and the paste Pst on the upper surface 25d of the table 25 is scraped toward the rear side of the table 25 by the scraper 32 provided in the paste scraping unit 28 sliding over the upper surface 25d of the table 25, resulting in the state shown in FIG. 11(a) above. Therefore, when the process from FIG. 11(b) to FIG. 11(c) is subsequently performed, the paste film PM is reformed on the upper surface 25d of the table 25 (FIG. 11(c)).

[0036] As described above, in this embodiment, the paste film forming device 14 comprises a table 25 to which the paste Pst is supplied, a paste scraping section 28 that slides against the table 25 to scrape the paste supplied to the table, and a squeegee 29 that is arranged opposite the paste scraping section 28 and moves relative to the table 25 to level the paste Pst scraped by the paste scraping section 28 to form a paste film PM, and the plate-shaped scraper 32 that constitutes the paste scraping section 28 is held by the scraper holder 31 so that its lower edge 32K is in an oblique position closer to the squeegee 29 than its upper edge 32J.

[0037] Therefore, according to the paste film forming device 14 of this embodiment, when the paste scraping unit 28 scrapes the paste Pst supplied to the table 25, the scraper 32 can scrape the paste Pst on the table 25 with little frictional resistance. This makes it possible to extend the life of the scraper 32 and reduce costs.

[0038] In particular, in this embodiment, the scraper 32 is made of resin, and the lower edge 32K of the scraper 32 can be brought into contact with the upper surface 25d of the table 25 while the scraper 32 is bent into a downwardly convex shape, thereby increasing the degree of contact between the scraper 32 and the upper surface 25d of the table 25. This also makes it possible in this embodiment to efficiently scrape the paste Pst on the table 25 using the paste scraping portion 28. Furthermore, if the scraper 32 is made of engineering plastic, it has high durability and a long lifespan, which also contributes to cost reduction.

[0039] Furthermore, in this embodiment, as described above, the scraper 32 has a shape symmetrical with respect to the central axis 32AX parallel to the lower edge 32K (the lower edge 32K side and the upper edge 32J side have the same shape), and when the scraper 32 is held down by the scraper holder 31 and the scraper pressing portion 33, any one of the upper edge 32J side and the lower edge 32K side at that time can be sandwiched between the scraper holder 31 and the scraper pressing portion 33. Therefore, if the lower edge 32K of the scraper 32 deteriorates after use, the scraper 32 can be reattached to the scraper holder 31 upside down so that the side that was previously the upper edge 32J becomes the lower edge 32K, thereby doubling the life of the scraper 32.

[0040] Furthermore, because the scraper 32 has a thickness, the lower edge 32K of the scraper 32 has not only an edge that abuts against the table 25, but also an edge that does not abut against the table 25. These two edges of the lower edge 32K have the same shape, and the edge that abuts against the table 25 can be swapped (i.e., the scraper 32 can be turned upside down) for use. The same is true for the upper edge 32J of the scraper 32, so the life of the scraper 32 can be extended up to four times by swapping the upper edge 32J and lower edge 32K as described above.

[0041] When the component mounting device 10 having the above configuration performs a component mounting operation of mounting components BH on a substrate KB, first, the control unit 10C operates the paste film forming device 14 to form (deposit) a paste film PM of a certain thickness on its table 25. After the paste film PM has been formed by the paste film forming device 14, the component mounting device 10 operates the transport conveyor 12 to receive and carry in the substrate KB sent from an apparatus upstream of the component mounting device 10, and position it at a predetermined work position.

[0042] After positioning the substrate KB at the work position, the control unit 10C operates each part feeder 13 to supply components BH to the component removal position 13T, while operating the head movement mechanism 15 to cause the mounting head 16 to repeatedly perform component transfer operations. In the component transfer operation, the mounting head 16 moves above the part feeders 13 and picks up the components BH supplied by the part feeders 13 with the nozzles 16a, and then moves above the paste film forming device 14 to bring the components BH into contact with the paste film PM. After the paste Pst is transferred to the components BH, the mounting head 16 moves above the substrate KB and mounts the components BH on the substrate KB.

[0043] The component mounting device 10 mounts the components BH to be mounted on the board KB by repeatedly performing the component transfer operation using the mounting head 16, and then operates the transport conveyor 12 to transport the board KB downstream, thereby completing the component mounting operation for one board KB.

[0044] The present embodiment has been described above, and includes the following techniques (paste film forming device 14 and component mounting device 10).

[0045] (Item 1) A paste film forming device (paste film forming device 14) comprising: a table (table 25) to which paste (paste Pst) is supplied; a paste scraping section (paste scraping section 28) that moves relative to the table to scrape the paste supplied to the table; and a squeegee (squeegee 29) that is arranged opposite the paste scraping section and moves relative to the table to level the paste scraped by the paste scraping section and form a paste film (paste film PM), wherein the paste scraping section has a plate-shaped scraper (scraper 32) and a scraper holder (scraper holder 31) that holds the scraper, and the scraper is held by the scraper holder so that its lower edge (lower edge 32K) is in an oblique position closer to the squeegee than its upper edge (upper edge 32J).

[0046] According to the paste film forming device of item 1, when the paste scraping section scrapes the paste supplied to the table, the scraper scrapes the paste Pst on the table 25 with little resistance, thereby extending the life of the scraper and reducing costs.

[0047] (Item 2) Item 2. The paste film forming apparatus according to item 1, wherein the scraper is flexible.

[0048] (Item 3) 3. The paste film forming apparatus according to item 2, wherein the scraper is made of a resin material.

[0049] (Item 4) Item 2. The paste film forming device according to item 1, wherein the scraper is held by the scraper holder by being sandwiched between the scraper holder and a scraper holding portion (scraper holding portion 33) attached to the scraper holder and holding the scraper.

[0050] (Item 5) Item 2. The paste film forming apparatus according to item 1, wherein the scraper has a symmetrical shape with respect to a central axis (central axis 32AX) parallel to the lower edge.

[0051] (Item 6) A component mounting device (component mounting device 10) including the paste film forming device according to any one of items 1 to 5, and a mounting head (mounting head 16) that attaches a component (component BH) to the paste film formed by the paste film forming device and then mounts it on a substrate (substrate KB).

[0052] Although the present embodiment has been described so far, the technology of the present disclosure is not limited to the above and various modifications are possible. For example, in the above embodiment, the scraper 32 has a shape symmetrical with respect to the central axis 32AX parallel to the lower edge 32K, but this is not an essential requirement, and the scraper 32 does not have to be able to be turned upside down if one edge is used and deteriorates.

[0053] In the above-described embodiment, the scraper 32 is made of a resin material, but it does not necessarily have to be made of a resin material as long as the scraper 32 is flexible. Furthermore, the scraper 32 does not necessarily have to be flexible as long as the scraper 32 is held by the scraper holder 31 in an oblique position such that the lower edge 32K of the scraper 32 is closer to the squeegee 29 than the upper edge 32J, thereby reducing resistance when scraping the paste Pst. [Industrial Applicability]

[0054] Provided is a paste film forming device and a component mounting device that can smoothly scrape paste using a paste scraping section. [Explanation of symbols]

[0055] 10. Parts mounting equipment 13 Parts feeder 13T Parts removal position 14 Paste film forming device 16 Mounting head 25 tables 25d top surface 28 Paste scraping section 29 Squeegee 31 scraper holder 31S screw 32 Scraper 32J Upper edge 32K lower edge 32AX center axis 33 Scraper holder 41 Film forming section 41M film formation surface SG Syringe PST Paste PM paste film BH parts KB board

Claims

1. a table on which the paste is dispensed; a paste scraping unit that scrapes the paste supplied to the table by moving relatively with respect to the table; a squeegee that is provided opposite the paste scraping unit and moves relative to the table to level the paste scraped by the paste scraping unit and form a paste film, The paste scraping unit includes a plate-shaped scraper and a scraper holder that holds the scraper, The scraper is held by the scraper holder so that its lower edge is closer to the squeegee than its upper edge.

2. The paste film forming apparatus according to claim 1 , wherein the scraper is flexible.

3. 3. The paste film forming apparatus according to claim 2, wherein the scraper is made of a resin material.

4. 2. The paste film forming device according to claim 1, wherein the scraper is held by the scraper holder by being sandwiched between the scraper holder and a scraper pressing portion attached to the scraper holder and pressing the scraper.

5. The paste film forming apparatus according to claim 1 , wherein the scraper has a shape symmetrical with respect to a central axis parallel to the lower edge.

6. The paste film forming apparatus according to any one of claims 1 to 5, a mounting head that attaches components to the paste film formed by the paste film forming device and then mounts the components on a substrate; A component mounting device comprising:

Images