JP3471508B2 - Cream solder screen printing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cream solder screen printing apparatus for applying cream solder for soldering electronic parts to a substrate.

[0002]

2. Description of the Related Art A screen printing apparatus for applying cream solder for soldering electronic parts to a substrate places a substrate below a screen mask and slides a squeegee on the screen mask in this state. Cream solder is applied onto the electrodes of the circuit pattern of the substrate through the pattern holes opened in the screen mask.

During printing of cream solder, part of the cream solder wraps around the lower surface of the screen mask through the pattern holes, and the lower surface of the screen mask is easily soiled. Therefore, the cream solder screen printing apparatus is provided with a screen mask cleaning unit, and the cleaning unit cleans the lower surface of the screen mask.

FIG. 5 is a partially enlarged sectional view of a cleaning unit of a conventional cream solder screen printing apparatus. Reference numeral 1 is a screen mask, 2 is a pattern hole, 3 is a pressing portion of a cleaning unit, and 4 is a cleaning tape. A hole portion 5 is opened in the pressing portion 3. As shown in the figure, the tape 4 is pressed against the lower surface of the screen mask 1 and slid in the direction of the arrow so that the cream solder 6 attached to the lower surface of the screen mask 1 is wiped with the tape 4. At this time, the tape 4 is strongly vacuum-sucked from the hole 5 so as to improve the cleaning effect.

[0005]

However, in the above-mentioned conventional means, the cream solder 6 wiped on the surface of the tape 4 is transferred to the lower surface of the screen mask 1 as indicated by reference numeral 6 ', and the screen mask 1 is soiled. There was a problem that it was easy.

Therefore, it is an object of the present invention to provide a cream solder screen printing apparatus provided with a cleaning unit that can clean the lower surface of a screen mask with a cleaning tape.

[0007]

To this end, a screen printing apparatus for cream solder according to the present invention includes a movable table for positioning a substrate below a screen mask, a cleaning unit for cleaning the lower surface of the screen mask, and the cleaning unit. A cleaning unit that moves the unit along the lower surface of the screen mask, the cleaning unit presses the cleaning tape against the lower surface of the screen mask, and the tape along the upper surface of the pressing unit. A blind portion is provided which has a traveling means for traveling and which forms a recessed portion on the upper surface of the pressing portion and supports the tape from below on the bottom surface of the recessed portion to prevent the tape from being greatly sucked downward. Leaving a large number of holes
Several holes are opened, and the many holes are connected to a suction unit so that the tape is sucked into the recess.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, by pressing a tape against the lower surface of a screen mask and sliding it,
The cream solder that adheres to this lower surface is wiped off, but since the tape from which the cream solder has been wiped is sucked into the recessed portion, the cream solder wiped onto the tape surface is not transferred to the lower surface of the screen mask, You can clean the screen mask cleanly.

An embodiment of the present invention will be described below with reference to the drawings. 1 is a side view of a screen printing apparatus for cream solder according to an embodiment of the present invention, FIG. 2 is a partial sectional view of the cleaning unit during cleaning, and FIG. 3 is a partial perspective view of a pressing portion of the cleaning unit. FIG. 4 is a sectional view of the cleaning unit.

In FIG. 1, reference numeral 11 is a base on which a linear rail 12 is installed. A movable table 20 and a cleaning unit 30 are installed on the linear rail 12. The movable table 20 is formed by stacking an X table 21 and a Y table 22 on top of which the substrate 13
The table 23 for fixing is mounted. X
By driving the table 21 and the Y table 22,
The substrate 13 is horizontally moved in the X direction and the Y direction to perform its positioning.

A screen mask 14 is provided above the base 11.
Is installed. A slide table 15 is provided above the screen mask 14. Two cylinders 16 are installed upside down on the slide table 15, and a squeegee 17 is held by a rod of the cylinder 16. Reference numeral 18 is cream solder supplied onto the screen mask 14. The movable table 20 is moved along the linear rail 12 to move the substrate 13 to the screen mask 14
And moves the Z table (not shown) to bring the upper surface of the substrate 13 close to the lower surface of the screen mask 14, and in this state, the squeegee 17 is moved.
By sliding on the screen 4, the cream solder 18 is applied onto the electrodes of the substrate 13 through the pattern holes formed in the screen mask 14. Next, the substrate 13 is lowered and separated from the screen mask 14, and the substrate 13 is sent to the next step.

The cleaning unit 30 comprises a support block 31, a cylinder 32 as an elevating means supported by the support block 31, and a case 34 held by a rod 33 of the cylinder 32. The support block 31 is installed on the linear rail 12, and the cleaning unit 30 moves laterally along the linear rail 12. That is, the linear rail 12 serves as a moving unit of the cleaning unit 30. The pressing portion 35 projects from the upper surface of the case 34. The case 34 is provided with a supply reel 37 and a take-up reel 38 for a cleaning tape 36. The tape 36 delivered from the supply reel 37 runs along the upper surface of the pressing portion 35 and is wound up by the take-up reel 38. That is, the supply reel 37 and the take-up reel 38 are running means for running the tape 36 on the pressing portion 35.

2 to 4, a recess 40 is formed on the upper surface of the pressing portion 35. A large number of slit-like hole portions 41 are opened at a pitch on the bottom surface of the recessed portion 40. In FIG. 3, the longitudinal direction N1 of the hole 41 is oblique to the running direction N2 of the tape 36. Also, the hole 41
A blind portion 42 is formed between the hole 41 and the hole 41. In FIG. 4, a communication portion 43 is provided below the pressing portion 35, and the hole portion 41 communicates with the communication portion 43. Communication part 43
Is connected to the suction unit 39 (FIG. 1). In FIG. 2, as a result of screen printing, the cream solder 18 remains adhered to the inner wall surface of the pattern hole 19 of the screen mask 14.

As described above, when the substrate 13 is moved below the screen mask 14 and the squeegee 17 is slid to apply the cream solder 18 on the upper surface of the substrate 13, a part of the cream solder 18 is removed from the screen mask 14. Wrap around the bottom surface and stain the bottom surface. Therefore, the lower surface of the screen mask 14 is regularly cleaned. This cleaning is performed as follows. That is, in FIG. 1, the cleaning unit 30 is moved on the linear rail 12 in the direction of arrow a. Next, the rod 33 of the cylinder 32 is projected to raise the case 34 in the direction of arrow b, and the tape 36 on the pressing portion 35 is pressed against the lower surface of the left end portion of the screen mask 14. Next, the cleaning unit 30 is moved in the direction of arrow c, and the tape 36 is slid along the lower surface of the screen mask 14.

FIG. 2 shows the sliding state. At the time of sliding, the tape 36 is vacuumed in the hole 41,
Therefore, the tape 36 is sucked into the recess 40 as shown. Therefore, the cream solder 18 that is wiped off the tape 36 and adheres to the surface of the tape 36
Is not transferred to the screen mask 14, and the lower surface of the screen mask 14 can be wiped clean. Note that in FIG. 4, if there is no blind portion 42 (that is, if the hole portion 41 has a large opening on the entire bottom surface of the recessed portion 40), there is nothing to support the tape 36 from below,
The tape 36 is greatly sucked downward.

On the contrary, when the opening area of the hole portion 41 is small, the cream solder 18 is sufficiently vacuum sucked by the tape 36 and is not adsorbed. Therefore, as in this embodiment, it is desirable to open the hole 41 largely while ensuring a minimum blind spot 42 that can prevent the tape 36 from being greatly sucked downward. Note that, as in the present embodiment, the hole portion 41 has a horizontally long slit shape, and its longitudinal direction N
By obliquely intersecting 1 with the running direction N2 of the tape 36, the opening area of the hole 41 is maximized and the tape 3
It is possible to prevent 6 from being greatly sucked into the hole 41.

In FIG. 1, when the cleaning of the lower surface of the screen mask 14 is completed by sliding in the direction of arrow c, the rod 33 of the cylinder 32 is retracted,
The case 34 is lowered to separate the tape 36 from the lower surface of the screen mask 14. Next, the next substrate 13 moves below the screen mask 14, and screen printing is restarted. When the cleaning of the screen mask 14 is completed, the take-up reel 38 is rotated to wind up the dirty tape 36 having the cream solder 18 adhered thereto, and the fresh tape 36 is fed out onto the pressing portion 35 for the next operation. Wait for cleaning.

[0018]

According to the first aspect of the present invention, the pressing portion for pressing the cleaning tape against the lower surface of the screen mask is formed with a recessed portion, and the bottom surface of the recessed portion is supported by the tape from below to lower the tape. a hole partially plurality openings leaving a blind unit to prevent from being sucked large and the multi
Since several holes are connected to the suction unit so that the tape can be sucked into the recess, the cream solder adhering to the lower surface of the screen mask was wiped off.The tape enters the recess, so it was wiped off. The cream solder does not adhere to the screen mask again, and the cream solder can be cleaned cleanly. And in this case
Since the blind portion supports the tape sucked into the concave portion from below, it is possible to prevent the tape from being greatly sucked downward. According to the second aspect of the present invention, the opening area of the hole can be maximized to prevent the tape from being greatly sucked into the hole.

[Brief description of drawings]

FIG. 1 is a side view of a screen printing apparatus for cream solder according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view during cleaning of a cleaning unit of a screen printing apparatus for cream solder according to an embodiment of the present invention.

FIG. 3 is a partial perspective view of a pressing portion of the cleaning unit of the screen printing apparatus for cream solder according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view of a cleaning unit of a cream solder screen printing apparatus according to an embodiment of the present invention.

FIG. 5 is a partially enlarged sectional view of a cleaning unit of a conventional cream solder screen printing apparatus.

[Explanation of symbols]

12 linear rail 13 board 14 screen mask 17 Squeegee 18 cream solder 20 movable table 30 cleaning unit 35 Pushing section 36 tapes 37 Supply reel 38 Take-up reel 39 Suction unit 40 Recessed part 41 hole 42 blind part

Continuation of front page (51) Int.Cl. ⁷ Identification code FI H05K 3/34 505 H05K 3/34 505C (72) Inventor Seiichi Miyahara 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56 ) References JP-A-6-238866 (JP, A)

Claims (2)

(57) [Claims] 1. A movable table for positioning a substrate below a screen mask, a cleaning unit for cleaning a lower surface of the screen mask, and a moving means for moving the cleaning unit along the lower surface of the screen mask. The cleaning unit has a pressing portion for pressing the cleaning tape against the lower surface of the screen mask, and a traveling means for causing the tape to travel along the upper surface of the pressing portion, and has a concave portion on the upper surface of the pressing portion. A large number of holes are partially opened at the bottom of the recess, leaving a blind part to support the tape from below and prevent the tape from being greatly sucked downward.
A screen printing device for cream solder, characterized in that a large number of holes are connected to a suction unit so that the tape is sucked into the recess. 2. The screen printing apparatus for cream solder according to claim 1, wherein the plurality of holes are slit-shaped and the longitudinal direction thereof is oblique to the running direction of the tape.