TWM581532U - Scraping printing device - Google Patents

Abstract

A squeegee device is suitable for squeezing a solder paste on a screen. The squeegee device comprises a squeegee module and a recycling module. The scraper module includes a scraper seat and a first scraper attached to a bottom side of the scraper seat. The first scraping blade has a first rake face adapted to push the solder paste, a first rake face opposite to the first rake face, and a first blade having two separate edges The first blade at the opposite ends. The recycling module has two second scraping blades respectively located behind the first cutting edges, each second scraping cutter has a second cutting edge that is not parallel to the first cutting edge, and a diagonally facing the scraping blade holder The first flank face is adapted to guide the portion of the solder paste to the outside of the first blade leading to the second rake face behind the first flank face.

Description

Scratch printing device

The present invention relates to a squeegee device, and more particularly to a squeegee device for surface mount technology.

It is a common electronic assembly process today to print a solder paste on a circuit board and then solder the electronic parts to the circuit board through a reflow oven. Referring to FIG. 1, the circuit board 91 is disposed under a stencil 92 before printing the solder paste 93. The stencil 92 has a plurality of hollowed out regions 921 corresponding to the solder paste on the circuit board 91. 93 position. Then, the solder paste 93 is filled in the stencil 92 by a feeding device (not shown), and a doctor blade 94 is activated to evenly scrape the solder paste 92 on the stencil 93 into the hollow regions 921, so that the solder paste 93 passes. The hollowed out areas 921 are applied to the circuit board 91. However, as the doctor blade 94 prints back and forth, some of the solder paste 93 will overflow from both sides of the blade 94, overflowing from the printed area on the screen 92. If the solder paste 93 of this portion is removed, the waste of the raw material will be caused. However, if the solder paste 93 of this portion is filled again on the mesh plate 92, the old and new mixed solder paste 93 can easily lower the overall soldering quality.

Therefore, one of the objects of the present invention is to provide a squeegee device capable of recovering solder paste.

Thus, in some embodiments, the novel squeegee apparatus is adapted to smear a solder paste along a squeegee path on a screen. The squeegee device comprises a squeegee module and a recycling module. The scraper module includes a scraper seat and a first scraper attached to a bottom side of the scraper seat. The first scraping tool has a first rake face adapted to push the solder paste, a first rake face opposite to the first rake face, and a first blade adapted to contact the mesh plate, The first cutting edge has two first blades at opposite ends. The recycling module is disposed on the scraper module and has two second scrapers respectively located behind the first blade ends, and each of the second scraping tools has a shape suitable for contacting the mesh plate and not parallel to the first cutting edge. a second cutting edge, and a second slanting surface facing the first flank face of the blade holder and adapted to overflow the portion of the solder paste to the outside of the first blade leading to the second behind the first flank face Front rake face.

In some embodiments, the recycling module includes two stoppers disposed at intervals in the blade holder, each of the stoppers having a bracket disposed on the blade holder and extending rearward, and each of the second blades is alternatively Set at the end of the bracket.

In some embodiments, the blade holder has an opposite front surface and a rear surface, and two side surfaces connected to the front surface and the rear surface at opposite positions, and the stoppers are disposed on the blade holder The rear surfaces are adjacent to the side surfaces, respectively, and extend outwardly and downwardly in a direction away from each other.

In some embodiments, each of the brackets has a fixing member disposed on the rear surface of the blade holder, and a connecting member elastically coupled to the fixing member and extending downwardly, and each of the second blades is disposed corresponding to The end of the connector.

In some embodiments, the fixing member has a fixing portion fixedly coupled to the blade holder, and an extending plate portion obliquely coupled to the fixing portion, the bracket further having a fastener and an elastic member. The fastener has a body extending through the extension plate portion and connected to the connecting member, and a head connected to the body portion and abutting against the top surface of the extension plate portion, the elastic member is sleeved on the tight portion The body and the two ends of the firmware abut against the bottom surface of the extension plate portion and the connecting member.

In some embodiments, the connector has a base, and a plate portion extending downward from the base side, the body of the fastener being coupled to the base of the connector, the elastic member The two ends respectively abut against the bottom surface of the extension plate portion and the base portion, and each of the second scrapers is alternatively disposed on the corresponding plate portion.

In some embodiments, each of the brackets has a fixing member disposed on the rear surface of the blade holder, and a connecting member connected to the fixing member and extending downwardly, the fixing member having a fixed connection thereto a fixing portion of the blade holder and an extending plate portion obliquely connected to the fixing portion, the connecting member having a base portion elastically connecting the fixing member, and a connecting plate portion extending downward from the side of the base portion Each second scraper may be alternatively disposed on the corresponding plate portion.

In some embodiments, each of the stoppers further has a positioning plate and a locking member, and the positioning plate and the second blade corresponding to the plate portion are sandwiched therebetween, and the locking member is detachably worn The plate portion, the second scraper and the positioning plate are disposed.

In some embodiments, the first scraper is at an angle of 60 degrees to the screen, and the second rake face of each second scraper is at an angle of 45 degrees to the web.

The present invention has at least the following effects: by providing two second scrapers located on the rear sides of the two first blades of the first scraper of the scraper module, the scraping device is operated from the first rake face The solder paste overflowing on both sides can be received by the second doctor blade and deflected back to the printing area.

Referring to Figures 2 and 7, an embodiment of the present printing apparatus 100 is adapted to smear a solder paste 93 to a circuit board 91 along a squeegee path on a screen 92. The screen 92 defines a printed area R and has a plurality of hollowed out areas 921 arranged in an array in the printed area R. The stencil 92 covers the circuit board 91, and the cutouts 921 correspond to a plurality of electronic components (not shown) on the circuit board 91, respectively.

Referring to FIGS. 2 to 4 , the squeegee apparatus 100 includes a squeegee module 1 and a recovery module 20 . The doctor blade module 1 includes a blade holder 11 coupled to a driving device (not shown), and a first blade 12 coupled to a bottom side of the blade holder 11. The blade holder 11 has an opposite front surface 111 and a rear surface 112, and two side surfaces 113 connected to the front surface 111 and the rear surface 112 at opposite positions. The first scraper 12 is connected to the bottom side of the blade holder 11 near the front surface 111 and extends obliquely toward the rear of the blade holder 11 to form an angle of 60 degrees with the screen 92. The first blade 12 has a first rake face 121 adapted to push the solder paste 93, a first flank face 122 opposite to the first rake face 121, and a first blade edge 123. The first blade 123 is adapted to contact the screen 92 (see FIG. 7) to shovel the solder paste 93 (see FIG. 7) from the surface of the screen 92 and to be slid along the first rake face 121. The path pushes forward. The first blade 123 has two first blades 123a respectively located at opposite ends and adjacent to the side surfaces 113, respectively. The first blades 123a are aligned with the boundary of both sides of the printing area R (see Fig. 7).

The recovery module 20 is disposed on the blade holder 11 and includes two stoppers 2 disposed on the rear surface 112 at intervals from each other. The stoppers 2 are adjacent to the side surfaces 113, respectively, and extend in the left-right direction beyond the side surfaces 113 toward the outside and downward. Specifically, each of the stoppers 2 has a bracket 21, a second scraper 22, a positioning plate 23, and a lock member 24.

The bracket 21 has a fixing member 211 , a connecting member 212 , two fasteners 213 , and two elastic members 214 . The fixing member 211 has a fixing portion 211a disposed on the rear surface 112 of the blade holder 11, and an extending plate portion 211b vertically connected to the bottom side edge of the fixing portion 211a and extending outwardly and rearward. The fixing members 211 of the two stoppers 2 have a symmetrical structure, that is, the extension plate portion 211b of one of the fixing members 211 is connected to the left bottom side edge of the fixing portion 211a and extends to the left. (As shown in the blocker 2 on the left side of FIG. 2), the extension plate portion 211b of the other of the fixing members 211 is connected to the right bottom side edge of the fixing portion 211a and extends to the right (see FIG. 2). The blocker 2 on the right is shown). Each of the extension plate portions 211b has two perforations 211c.

The connecting member 212 is elastically coupled to the fixing member 211 and extends downward. Specifically, the connecting member 212 has a base portion 212a, and a connecting plate portion 212b that is bent downward and extends rearward from a side of the base portion 212a adjacent to the blade holder 11. The two fasteners 213 are bolts in this embodiment, and each fastener 213 has a body portion 213a and a head portion 213b connected to the body portion 213a. The body portions 213a of the fasteners 213 respectively pass through the through holes 211c of the extension plate portion 211b and are screwed to the base portion 212a of the connecting member 212. The elastic members 214 are respectively sleeved on the body portions 213a of the fasteners 213, and the two ends of the elastic members 214 are respectively abutted against the bottom surface of the extension plate portion 211b and the base portion 212a, so that the extension plate portion 211b is received by the extension plate portion 211b. The elastic member 214 elastically pushes against the top surface of the extension plate portion 211b to abut against the head portion 213b of each fastener 213.

The second scraper 22 is alternatively disposed on the tab portion 212b and located behind the first blade edge 123a. Specifically, the second scraper 22 is interposed between the positioning plate 23 and the connecting plate portion 212b, and is detachably passed through the connecting plate portion 212b and the second scraping blade 22 by the locking member 24. The positioning plate 23 locks and fixes the second blade 22, and also facilitates the replacement of the second blade 22. The second scraper 22 has the same material as the first scraper 12 and has a second rake face 221, a second flank face 222, and a second blade 223. In this embodiment, the second rake face 221 is inclined at an angle of 45 degrees to the mesh plate 92. The second cutting edge 223 is adapted to contact the screen 92 and has two second blades 223a at opposite ends. The second cutting edges 223 of the second scrapers 22 of the blockers 2 are not parallel to the first cutting edge 123, and the second cutting edges 223a of the second cutting edges 223 near the inner side are on the printing path. The second flank 223a closer to the outer side is away from the first flank 122, so that the second rake faces 221 of the second squeegees 22 are obliquely faced to the first flank of the blade holder 11. 122.

Referring to FIG. 5 to FIG. 7, this embodiment is suitable for matching two sets of the printing apparatus 100 in a solder paste printing process. The squeegee devices 100 are arranged on the squeegee path, and the front surface 111 of each squeegee device 100 faces the front surface 111 of the other squeegee device 100.

First, one of the squeegees 100 is lifted away from the stencil 92, and the other of the squeegees 100 is abutted against the stencil 92 and scraped along a first squeegee direction D1. Print the solder paste 93. During the squeegee process, a portion of the solder paste 93 that has not been scraped into the hollow regions 921 will accumulate on the first rake face 121 and overflow to both sides, and overflow from the first blade edges 123a. The printing area R. At this time, the second scrapers 22 of the stoppers 2 disposed behind the first blades 123a can overflow the solder paste 93 to the outside of the first blades 123a from the surface of the mesh plate 92. And the second rake face 221 is obliquely facing the design of the first flank face 122, so that the solder paste 93 is obliquely pushed by the second rake face 221 to guide the flow to the Behind the first flank 122, return to the printing area. In addition, it is worth mentioning that the area adjacent to the two sides of the stencil 92 (the area other than the printing area R) is not covered by the circuit board 91, and therefore is not supported by the circuit board 91. If the squeegee pressure is large, it is easy. The deformation of the stencil 92 is such that the elastic members 214 of the stoppers 2 can elastically connect the connecting members 212 and the second scrapers 22 to the fixing member 211 to reduce the scraping during the squeegee process. The printing pressure increases the effect of the squeegee without affecting the pressure exerted by the first squeegee 12 on the stencil 92.

Referring to Figures 8 and 9, when the printing apparatus 100 is smeared to the end of the squeegee area R, the squeegee apparatus 100 will be lifted away from the stencil 92 and will be smear away from the stencil 92. The device 100 descends against the screen 92, and causes the printing apparatus 100 to squeege the solder paste 93 in a second squeegee direction D2 opposite to the first squeegee direction D1. The solder paste 93 recovered to the printing area R in the previous stage can be scraped again by the printing apparatus 100 at this stage, and can be recycled again without causing waste of the solder paste 93. In addition, since the time interval of the printing and printing of the printing apparatus 100 is short, the quality of the solder paste 93 to be recovered does not greatly differ from the quality of the newly filled solder paste 93, and a better soldering quality can be maintained.

In summary, the new type of squeegee apparatus 100 operates the squeegee apparatus 100 by providing two second squeegees 22 respectively located on the rear side of the first blades 123a of the first squeegee 12 of the squeegee module 1. During the process, the solder paste 93 overflowing from the first rake face 121 to the two sides can be received by the second scraper 22 and deflected back to the printing area R to avoid waste of the solder paste 93, so that the present invention can be achieved. purpose.

However, the above is only the embodiment of the present invention, and when it is not possible to limit the scope of the present invention, all the simple equivalent changes and modifications according to the scope of the patent application and the contents of the patent specification are still This new patent covers the scope.

100‧‧‧Scratch

1‧‧‧ scraper module

11‧‧‧Scraper

111‧‧‧ front surface

112‧‧‧Back surface

113‧‧‧ side surface

12‧‧‧First scraper

121‧‧‧First rake face

122‧‧‧First flank

123‧‧‧first blade

123a‧‧‧First Blade

20‧‧‧Recycling module

2‧‧‧Barrier

21‧‧‧ bracket

211‧‧‧Fixed parts

211a‧‧‧Fixed Department

211b‧‧‧ Extension Board

211c‧‧‧Perforation

212‧‧‧Connecting parts

212a‧‧‧ base

212b‧‧‧Contact Board

213‧‧‧fasteners

213a‧‧‧ Body

213b‧‧‧ head

214‧‧‧Flexible parts

22‧‧‧second scraper

221‧‧‧second rake face

222‧‧‧second flank

223‧‧‧second blade

223a‧‧‧second blade

23‧‧‧ Positioning board

24‧‧‧Locks

91‧‧‧Circuit board

92‧‧‧ stencil

921‧‧‧ hollow area

93‧‧‧ solder paste

94‧‧‧Scraper

R‧‧‧Printing area

D1‧‧‧First Scratch Direction

D2‧‧‧second print direction

Other features and effects of the present invention will be apparent from the following description of the drawings, in which:  1 is a schematic view showing that a conventional doctor blade easily overflows from both sides of a doctor blade when scratching a solder paste;  Figure 2 is a perspective view of an embodiment of the novel squeegee apparatus;  Figure 3 is a perspective view of a stopper of the embodiment;  Figure 4 is a rear elevational view of the embodiment;  Figure 5 is a side elevational view showing the application of two novel printing apparatuses in a solder paste printing process;  Figure 6 is a side elevational view showing one of the squeegee devices rising away from a stencil and causing the other of the squeegees to abut the stencil and along a first stencil Scratch the solder paste in the direction;  Figure 7 is a top plan view showing that solder paste overflowing from both sides of a first doctor blade of the embodiment is recovered by the two stoppers of the embodiment during the squeegee process;  Figure 8 is a side elevational view showing one of the squeegee devices rising away from a screen and having the other of the squeegees abutting the screen and along a second stencil Scratch the solder paste in the direction; and  Figure 9 is a top plan view showing that the recovered solder paste is again smeared by the squeegee.  

Claims (9)

A squeegeing device is adapted to smear a solder paste along a stenciling path on a stencil, the squeegee device comprising:  a scraper module comprising a scraper seat and a first scraper attached to a bottom side of the scraper seat, the first scraper having a first rake face adapted to push the solder paste, and opposite to the first a first flank face of the rake face, and a first blade adapted to contact the stencil, the first blade having two first blades at opposite ends;  a recycling module disposed on the blade module and having two second blades respectively located behind the first blades, each second blade having a shape suitable for contacting the mesh plate and not parallel to the first blade a second cutting edge, and a first flank face obliquely facing the blade holder and adapted to overflow the portion of the solder paste to the outside of the first blade leading to the rear of the first flank face Second front knife face.   The squeegee device of claim 1, wherein the recycling module comprises two stoppers disposed at intervals in the blade holder, each of the stoppers having a bracket disposed on the blade holder and extending rearward, each of the brackets A second scraper is alternatively disposed at the end of the stent. The squeegee device of claim 2, wherein the squeegee holder has an opposite front surface and a rear surface, and two side surfaces connected to the front surface and the rear surface at opposite positions, the blocking The device is disposed on the rear surface of the blade holder and adjacent to the side surfaces, respectively, and extends outward and downward toward a direction away from each other. The squeegee device of claim 2, wherein each of the brackets has a fixing member disposed on the rear surface of the blade holder, and a connecting member elastically coupled to the fixing member and extending downwardly, each of the first Two scrapers are disposed at the ends of the corresponding connectors. The squeegee device of claim 4, wherein the fixing member has a fixing portion fixedly coupled to the blade holder, and an extension plate portion obliquely coupled to the fixing portion, the bracket further having a tight a fastener and a resilient member having a body extending through the extension plate portion and coupled to the connector member, and a head coupled to the body portion and abutting against a top surface of the extension plate portion, the elasticity The sleeve is sleeved on the body of the fastener and the two ends abut against the bottom surface of the extension plate portion and the connecting member. The squeegee device of claim 5, wherein the connecting member has a base portion, and a gusset portion extending downward from the side of the base portion, the body of the fastener being coupled to the connecting member In the base portion, the two ends of the elastic member abut against the bottom surface of the extending plate portion and the base portion, and each of the second scraping blades is alternatively disposed on the corresponding connecting plate portion. The squeegee device of claim 2, wherein each of the brackets has a fixing member disposed on the rear surface of the blade holder, and a connecting member connected to the fixing member and extending downwardly, the fixing member having a fixing portion fixedly coupled to the blade holder, and an extension plate portion obliquely coupled to the fixing portion, the connecting member having a base portion elastically coupled to the fixing member, and a bent portion from a side of the base portion The lower extending plate portion, each of the second blades is alternatively disposed on the corresponding plate portion. The squeegee device of claim 6 or 7, wherein each of the dampers further has a positioning plate and a locking member, and the positioning plate and the second squeegee corresponding to the slat portion are sandwiched therebetween. The locking member is detachably disposed through the connecting plate portion, the second scraping blade and the positioning plate. The squeegee device of claim 1, wherein the first squeegee and the stencil are at an angle of 60 degrees, and the second rake face of each second squeegee is at an angle of 45 degrees to the stencil.