JPH06210828A - Screen printing machine for cream solder - Google Patents

Abstract

PURPOSE:To automate recovery and supply by landing a cream solder recovery plate on a screen mask (mask) at the time of the replacement of the mask to support the rear surface of the mask by a support and sliding a squeegee to recover cream solder. CONSTITUTION:When a mask 1 is replaced, cream solder 20 on a mask 1 is recovered between squeegees 9 and, after the rear surface of the mask is cleaned, the hole part 28 of the arm 29 of a slide plate 6 is moved to the position just under a cylinder 26 by a motor 13 and a rod 27 is inserted in the hole part 28. The motor 13 is reversely rotated to move a plate 21 to the vicinity of the cream solder 20 and the rod 27 is separated from the hole part 28 and the plate 21 is placed on the mask 1 by the rod 23 of the cylinder 22 and, at the same time, a support block is raised by a motor to support the rear surface of the mask 1. Next, the motor 13 is rotated to slide the squeegees 9 and the cream solder 20 on the mask 1 is scraped up to the plate 21. The squeegees 9 and the plate 21 are raised to replace the mask 1 and, thereafter, the plate 21 is again placed on the mask 1 and the cream solder 20 on the plate 21 is scraped out by the squeegees 9.

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 printing a circuit pattern on a substrate with cream solder.

[0002]

2. Description of the Related Art A screen printing apparatus for printing cream solder on a circuit pattern of a board is arranged so that the board is brought close to the lower surface of a screen mask having a pattern hole and a squeegee is slid on the upper surface of the screen mask. It is designed to print solder on the board. When the type of substrate is changed, the used old screen mask is removed from the screen printing device, and a new screen mask having a desired pattern hole is set in the screen printing device.

In this case, the residual portion of the cream solder left over is adhered to the old screen mask. Conventionally, the residual portion of the cream solder is manually scraped off by an operator with a spatula or the like. It was designed such that it was once collected in a storage pot, and then the cream solder in this pot was supplied to a new screen mask set in a screen printing device.

[0004]

However, all the above-mentioned work is troublesome because it is carried out manually, and there is a problem that it imposes a considerable labor burden on the worker.

Therefore, an object of the present invention is to provide a screen printing apparatus for cream solder which can automatically perform the above-described cream solder recovery operation and replenishment operation.

[0006]

To this end, a screen printing apparatus for cream solder according to the present invention has a plate for recovering cream solder provided above a screen mask, and this plate is grounded on the upper surface of the screen mask. A vertical movement means for moving the plate up and down in order to lift it from the screen mask, and a raising and lowering means for the support block for supporting the substrate from below in order to bring the substrate close to and away from the lower surface of the screen mask, and the screen It comprises a support for supporting the mask from below, and an elevating means for bringing the support into contact with the lower surface of the screen mask and separating it from the lower surface.

[0007]

In the above structure, when the screen mask is replaced due to the change of the board type, the plate is landed on the screen mask and then the squeegee is slid to remove the cream solder remaining on the screen mask. Collect on plate. In this case, by raising the support and supporting the lower surface of the screen mask by this support, the downward deflection of the screen mask is prevented, and the screen solder is scraped up onto the plate by a squeegee.

[0008]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a perspective view of a screen printing apparatus for cream solder according to an embodiment of the present invention. A screen mask 1 has a pattern hole 2 formed therein. Reference numeral 3 is a mask holder on which the screen mask 1 is set, and guide rails 4 are provided on both sides of the upper surface thereof. Reference numeral 6 is a sliding plate, which is laid over the left and right guide rails 4 via a slider 5. Three cylinders 41, 42, 43 are provided on the sliding plate 6. The squeegee 9 for printing is held on the rods 44 and 45 of the cylinders 41 and 42, respectively, and the squeegee 47 for recovery is held on the rod 46 of the cylinder 43 at the left end (see also FIG. 2). This squeegee 47 is a squeegee 9
It has substantially the same shape as the above, has a sharp lower end portion 47a, and is made of a horizontally long plate so as to be in linear contact with the upper surface of the screen mask 1. When the rods 44 and 45 are projected and retracted by the cylinders 41 and 42, the squeegee 9 moves up and down, and the lower end portion of the squeegee 9 contacts the upper surface of the screen mask 1,
I'll leave this again. When the rod 46 of the cylinder 43 is projected, the squeegee 47 descends and contacts the upper surface of the screen mask 1, and when the rod 46 is retracted, the squeegee 47 rises and separates from the screen mask 1.

In FIG. 1, a nut 11 is mounted on one side of the sliding plate 6. A ball screw 12 parallel to the guide rail 4 is screwed into the nut 11, and when the motor 13 is driven to rotate the ball screw 12, the nut 1 is rotated.
1 slides along the ball screw 12, and the squeegee 9 and the squeegee 47 held by the slide plate 6 slide integrally on the screen mask 1.

Reference numeral 21 is a plate for collecting cream solder arranged on the screen mask 1, and both ends thereof are respectively connected to rods 23 of a cylinder 22. As will be described later, when the screen mask 1 is replaced, the cream solder 20 remaining on the screen mask 1 is scraped up and collected on the plate 21. Reference numerals 24a and 24b denote slide plates to which the cylinder 22 is attached, and are mounted on the guide rail 4 via the slider 25. A cylinder 26 is arranged on one slide plate 24a.
The slide plate 6 is provided with an arm 29 having a hole 28 formed therein, and the rod 27 of the cylinder 26 is inserted into and removed from the hole 28 (see also FIG. 3).

A standing plate 31 is provided on the back side of the mask holder 3. The standing plate 31 is provided with a rodless cylinder 32, and the rodless cylinder 32 is equipped with a dispenser 33 as a replenishing means of the cream solder 20. Therefore, by operating the rodless cylinder 32, the dispenser 33 slides along the rod 34 and discharges the cream solder 20 to a desired position on the screen mask 1.

Guide rails 48 are provided at both ends of the lower surface of the mask holder 3, and these guide rails 48 are provided.
A moving plate 50 is bridged over the slider 49 via a slider 49. A nut 51 is mounted on one end of the moving plate 50. A ball screw 52 parallel to the guide rail 48 is screwed into the nut 51. When the motor 53 is driven and the ball screw 52 rotates, the moving plate 50 moves below the screen mask 1 along the guide rail 48. Slide. A cleaning unit 60 for cleaning and removing the lower surface of the screen mask 1 is provided on the central portion of the moving plate 50. Next, with reference to FIG. 1 and FIG.
Will be explained.

FIG. 2 is a side view of a cream solder screen printing apparatus according to an embodiment of the present invention. A cylinder 61 is provided on the lower surface of the center of the moving plate 50, and a horizontally long block 63 is provided on the upper end of a rod 62 of the cylinder 61.
Is attached. On the upper front side of the block 63,
Cream solder 20 attached to the lower surface of the screen mask 1
A cleaning element 64 for scraping off the cream solder 20 is provided, and a suction portion 65 for sucking and cleaning the cream solder 20 attached to the inner edge of the pattern hole 2 of the screen mask 1 is bored inside the block 63.

The cleaning element 64 is composed of a horizontally long plate, and a sharp edge 64a at the upper end thereof is in sliding contact with the lower surface of the screen mask 1 (see also FIG. 5). The upper end opening of the suction port 66 communicating with the suction unit 65 is close to the lower surface of the screen mask 1.

The cleaning element 64 and the suction section 65 are provided in the motor 53.
It reciprocates below the screen mask 1 as the movable plate 50 slides due to the drive shown in FIG. These components make up a reciprocating means for horizontally reciprocating the squeegee 47 and the cleaning element 64 along the screen mask 1. In FIG. 1, a joint portion 67 that communicates with the suction portion 65 is provided on one side of the block 63, and the joint portion 67 is connected to a suction device 69 via a connecting tube 68.

FIG. 6 is a sectional view of a cream solder screen printing apparatus according to an embodiment of the present invention. Directly below the screen mask 1 are a pair of left and right brackets 71a, 71b.
The brackets 71a and 71b are provided with a conveyor 72 for carrying the substrate 80. A movable clamper 73 is provided on one of the brackets 71a. This movable clamper 73 is a cylinder 74.
Is connected to the rod 75 of the. Reference numeral 76 is a holder for the cylinder 74. A fixed clamper 77 is provided on the other bracket 71b. Therefore cylinder 7
When the rod 75 of No. 4 protrudes to the right, the substrate 80 is clamped and fixed by the movable clamper 73 and the fixed clamper 77, and when the rod 75 of the cylinder 74 retracts,
The clamped state of the substrate 80 is released.

A support block 81 is provided below the substrate 80. The support block 81 is installed on the lifting body 82. Nuts 83a, 8 are provided on both sides of the lifting body 82.
3b is provided, and vertical ball screws 84a and 84b are screwed into the nuts 83a and 83b. Timing pulleys 85a and 85b are attached to the ball screws 84a and 84b.
Is mounted, and a timing belt 86 is attached to the timing pulleys 85a and 85b. One ball screw 84b is supported by a bearing 87, and the lower end of the other ball screw 84b is connected to a motor 88.

Therefore, when the motor 88 is rotated forward,
The ball screws 84a and 84b rotate at the same time to move the lifting body 82.
Rises, the support block 81 pushes up the substrate 80,
The upper surface of the substrate 80 is brought close to the lower surface of the screen mask 1. As will be described later, the cream solder 2 on the substrate 80
After the application of 0 is completed and the substrate 80 is carried out to the next step by the conveyor 72 and removed, the supporting block 81 is similarly lifted, and the upper surface of the supporting block 81 is brought into contact with the lower surface of the screen mask 1. The screen mask 1 can be supported from below. Ie support block 8
Reference numeral 1 also serves as a support for the screen mask 1, and has a first height for bringing the upper surface of the substrate 80 close to the lower surface of the screen mask 1 while supporting the substrate 80, and a support block with the substrate 80 removed. A second height at which the upper surface of 81 abuts the lower surface of the screen mask 1 can be selected.

1 and 7, the slide plate 24b
A cylinder 91 is provided on the top. The rod 92 of the cylinder 91 is connected with a pressing piece 93 having a key-shaped side surface. The lower end of the pressing piece 93 hangs along the outer surface of the mask holder 3, and a pad 94 is attached to the inner surface thereof. Therefore, the rod 92 of the cylinder 91
When is pulled in, the pad 94 presses against the outer surface of the mask holder 3 to fix the plate 21. That is, the cylinder 91 and the pressing piece 93 serve as fixing means for preventing the plate 21 from wobbling when the cream solder 20 is scraped up onto the plate 21 or when the cream solder 20 on the plate 21 is scraped out onto the screen mask 1. ing. Reference numeral 10 is a holder to which the screen mask 1 is attached.

This screen printing apparatus has the above-mentioned structure, and its operation will be described below. As shown in FIG. 1, the plate 21 is retracted to the right, the moving plate 50 is retracted to the left, and the rod 62 of the cylinder 61 is retracted.
And the cleaning element 64 is separated from the screen mask 1. As shown in FIG. 2, the cream solder 20 is stored between the squeegee 9 and the squeegee 9.
To move the squeegee 9 back and forth on the screen mask 1 through the pattern holes 2 to drive the substrate 80.
The cream solder 20 is applied to. In this case, the support block 81 is raised to a first height that brings the upper surface of the substrate 80 close to the lower surface of the screen mask 1. When the cream solder 20 is applied in this manner, the cream solder 20 leaks from the pattern hole 2 and adheres to the lower surface of the screen mask 1, so that the cleaning must be performed appropriately.

When cleaning the cream solder 20 leaking to the lower surface of the screen mask 1, the cream solder 20 adhering to the lower surface of the screen mask 1 is scraped off by the cleaning element 64 as shown in FIG. The cream solder 20 attached to the inner edge of the pattern hole 2 of No. 1 is sucked by the suction port 66 to the suction unit 65 by the negative pressure of the suction device 69. Further, the cream solder 20 attached to the inner edge of the pattern hole 2 can be removed by suction by the suction device 69. The cleaning operation of the screen mask 1 as described above is performed every predetermined time during the screen printing operation, or when the screen mask 1 is replaced with the change of the type of the substrate 80.

By the way, when the screen mask 1 is replaced with a change in the type of the substrate 80, the cream solder 20 remaining on the screen mask 1 is collected. As described above, after the cream solder 20 adhering to the lower surface of the screen mask 1 is cleaned and removed by the squeegee 47 and the cleaning element 64, the motor 13 is driven to move the sliding plate 6 in the arrow direction (right direction) in FIG. ), The hole 28 of the arm 29 is moved to a position directly below the cylinder 26 as shown in FIG. 3, and the rod 27 is projected there to insert the rod 27 into the hole 28.

Next, when the motor 13 is driven in the reverse direction,
The plate 21 is pulled by the sliding plate 6 and the cream solder 2
It moves to the vicinity of 0 (see FIG. 4A). Therefore, the rod 27 of the cylinder 26 is pulled in and separated from the hole 28, and the rod 23 of the cylinder 22 is projected to land the plate 21 on the screen mask 1 (see the chain line in FIG. 4A). At the same time, the motor 8
8 (FIG. 6) is driven to raise the support block 81, and the screen mask 1 is supported by the support block (FIG. 4).
(See (a) chain line). Further, as shown in FIG.
The rod 92 of No. 1 is pulled in and the pad 94 is pressed against the outer surface of the mask holder 3 to fix the plate 21.

Then, as shown in FIG.
Is rotated to slide the squeegee 9 to the right, and the cream solder 20 on the screen mask 1 is scraped up on the plate 21. Then, the cylinders 41, 42 and the motor 13 are operated to raise the squeegee 9 from the plate 21, and the rod 23 of the cylinder 22 is retracted to raise the plate 21 to its original position, so that the cream solder 20 stays on the plate 21. Are collected (see FIG. 4 (c)). In this case, since the screen mask 1 is supported by the support block 81, when the cream solder 20 is scraped up by the squeegee 9 onto the plate 21, the screen mask 1 does not bend downward, and the pad 94 is used as a mask holder. Since the plate 21 is fixed on the screen mask 1 by being pressed against the plate 3, the cream solder 20 can be reliably scraped up on the plate 21.

When the replacement of the screen mask 1 is completed, the plate 21 is landed at a proper position on the screen mask 1 as shown in FIG. 4 (d), and the squeegee 9 is slid by the same operation as described above to move the plate 21. Top cream solder 2
After scratching 0 onto the screen mask 1, the pad 94
After releasing the fixed state by, the rod 27 of the cylinder 26 is reinserted into the hole 28, the motor 13 is driven to retract the plate 21 to the side, and then the cream solder 20 is applied to the substrate 80. To resume. Even when the cream solder 20 is scraped out from the plate 21, it is desirable to raise the support block 81 to support the screen mask 1 and press the pad 94 against the outer surface of the mask holder 3.

As described above, according to this screen printing apparatus, the cream solder 20 can be automatically collected and replenished when the type of the board is changed. The squeegee 47 and the cleaning element 64 are kept away from the screen mask 1 when the cream solder 20 is collected and replenished.

In the above embodiment, the support block 81 also serves as a support for abutting against and supporting the lower surface of the screen mask 1 when collecting the cream solder 20, but the support block 81 and the support are separate bodies. Alternatively, the separate support may be moved in a desired manner by the horizontal moving means and the elevating means to abut against the lower surface of the screen mask 1 to support it.

[0029]

As described above, according to the present invention, it is possible to automatically collect the cream solder on the screen mask and replenish the cream solder when the type of the substrate is changed.

[Brief description of drawings]

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

FIG. 2 is a side view of a screen printing apparatus for cream solder according to an embodiment of the present invention.

FIG. 3 is a partial side view of a cream solder screen printing apparatus according to an embodiment of the present invention.

FIG. 4A is a side view of the cream solder according to an embodiment of the present invention during collection and replenishment. FIG. 4B is a side view of the cream solder according to an embodiment of the present invention during collection and replenishment. Side view during recovery and supply of cream solder according to an embodiment (d) Side view during recovery and supply of cream solder according to an embodiment of the present invention

FIG. 5 is a cross-sectional view of a main part of a cream solder screen printing apparatus according to an embodiment of the present invention.

FIG. 6 is a sectional view of a screen printing apparatus for cream solder according to an embodiment of the present invention.

FIG. 7 is a front view of the plate fixing means of the screen printing apparatus for cream solder according to the embodiment of the present invention.

[Explanation of symbols]

 1 Screen Mask 2 Pattern Hole 9 Squeegee 11 Nut 12 Ball Screw 13 Motor 20 Cream Solder 21 Plate 22 Cylinder 80 Substrate 81 Support Block (Support) 82 Elevator 83a Nut 83b Nut 84a Ball Screw 84b Ball Screw 88 Motor

Claims (2)

[Claims] 1. A screen mask, a squeegee that slides on the upper surface of the screen mask to apply cream solder to a substrate through a pattern hole formed in the screen mask, and a sliding means that slides the squeegee. A supporting block for supporting the substrate from below, and elevating means for elevating and lowering the supporting block to bring the substrate close to the lower surface of the screen mask and to separate from the lower surface,
A support for supporting the screen mask from below, an elevating means for bringing the support into contact with the lower surface of the screen mask and separating it from the lower surface, and a cream solder recovery device provided above the screen mask. And a vertically moving means for vertically moving the plate so that the plate is grounded on the upper surface of the screen mask and lifted from the screen mask. 2. The screen printing apparatus for cream solder according to claim 1, wherein the support block also serves as the support.