JP3047657B2 - 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 printing a circuit pattern on a substrate using cream solder.

[0002]

2. Description of the Related Art A screen printing apparatus for printing cream solder on a circuit pattern of a substrate is provided by bringing the substrate close to the lower surface of a screen mask having pattern holes formed thereon and sliding a squeegee on the upper surface of the screen mask. Solder is printed on the board. When the type of substrate is changed, the used old screen mask is removed from the screen printing apparatus, and a new screen mask having a desired pattern hole is set in the screen printing apparatus.

[0003] In this case, the remaining portion of the remaining cream solder is attached to the old screen mask. Conventionally, the remaining portion of the cream solder is manually scraped off with a spatula by an operator. Once collected in a storage pot, the cream solder in this pot is then supplied to a new screen mask set in a screen printing device.

[0004]

However, the above work is troublesome since it is performed manually, and there is a problem that a considerable labor burden is imposed on the worker.

Accordingly, an object of the present invention is to provide a cream solder screen printing apparatus capable of automatically performing the above-mentioned cream solder collection and replenishment operations.

[0006]

For this purpose, a cream solder screen printing apparatus according to the present invention comprises a plate for collecting cream solder, which is provided above a screen mask, and this plate is grounded on the upper surface of the screen mask. Up and down moving means for moving the plate up and down in order to raise the plate from the screen mask, and a support block elevating means for supporting the substrate from below in order to bring the substrate close to the lower surface of the screen mask and to separate it from the screen mask; It comprises a support for supporting the mask from below, and 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 arrangement, when replacing the screen mask with the change of the type of the board, 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, the support is raised to support the lower surface of the screen mask with the support, thereby preventing the screen mask from bending downward and scraping the screen solder onto the plate with a squeegee.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a cream solder screen printing apparatus according to an embodiment of the present invention. Reference numeral 1 denotes a screen mask having pattern holes 2 formed therein. Reference numeral 3 denotes a mask holder on which the screen mask 1 is set, and guide rails 4 are provided on both sides of the upper surface. Reference numeral 6 denotes a sliding plate, which extends over the left and right guide rails 4 via the slider 5. On this sliding plate 6, three cylinders 41, 42, 43 are provided. 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 collection is held on the rod 46 of the cylinder 43 at the left end (see also FIG. 2). This squeegee 47 is squeegee 9
And has a sharp lower end portion 47a, and is formed of a horizontally long plate so as to be in sliding contact with the upper surface of the screen mask 1. When the rods 44 and 45 are pushed and retracted by the cylinders 41 and 42, the squeegee 9 moves up and down, and its lower end is grounded on the upper surface of the screen mask 1,
I will leave it 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. 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. When the motor 13 is driven to rotate the ball screw 12, the nut 1
1 slides along the ball screw 12, and the squeegee 9 and the squeegee 47 held by the sliding plate 6 slide on the screen mask 1 integrally.

Reference numeral 21 denotes a plate for collecting cream solder disposed 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 plate mask 1 is scraped up on the plate 21 and collected. 24a and 24b are slide plates on which the cylinder 22 is mounted, and are mounted on the guide rail 4 via the slider 25. A cylinder 26 is provided on one slide plate 24a.
The sliding 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).

An upright plate 31 is provided on the back side of the mask holder 3. A rodless cylinder 32 is provided on the standing plate 31, and a dispenser 33 as a means for supplying the cream solder 20 is mounted on the rodless cylinder 32. Therefore, when the rodless cylinder 32 operates, 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 through 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 to rotate the ball screw 52, the moving plate 50 moves under 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 center of the moving plate 50. Next, referring to FIG. 1 and FIG.
Will be described.

FIG. 2 is a side view of a cream solder screen printing apparatus according to one 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 attached. On the upper front side of the block 63,
Cream solder 20 adhered to the lower surface of screen mask 1
The block 63 is provided with 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.

The cleaning element 64 is formed 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 section 65 is close to the lower surface of the screen mask 1.

The cleaning element 64 and the suction section 65 are
The sliding movement of the moving plate 50 by the driving of FIG. 1 causes the reciprocating movement below the screen mask 1. These components constitute reciprocating means for reciprocating the squeegee 47 and the cleaning element 64 in the horizontal direction along the screen mask 1. In FIG. 1, a joint portion 67 communicating with the suction portion 65 is protruded from one side of the block 63, and this joint portion 67 is connected to a suction device 69 via a connection tube 68.

FIG. 6 is a sectional view of a cream solder screen printing apparatus according to an embodiment of the present invention. Immediately below the screen mask 1, a pair of left and right brackets 71a, 71b is provided.
The brackets 71a and 71b are provided with a conveyor 72 for transporting the substrate 80. A movable clamper 73 is provided on one bracket 71a. The movable clamper 73 includes a cylinder 74
Rod 75. 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 rightward, 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 is retracted,
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 elevating body 82. Nuts 83a, 8 are provided on both sides of the lifting body 82.
3b is provided, and nuts 83a and 83b are screwed with vertical ball screws 84a and 84b. Timing pulleys 85a, 85b are attached to the ball screws 84a, 84b.
The timing belt 86 is tuned 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
Rises, and 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. Further, as described later, the cream solder 2
0 is completed, the substrate 80 is carried out to the next step by the conveyor 72 and removed, and the support block 81 is similarly raised to bring the upper surface of the support block 81 into contact with the lower surface of the screen mask 1. Thus, the screen mask 1 can be supported from below. That is, the support block 8
Reference numeral 1 also serves as a support for the screen mask 1, 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 for removing the substrate 80. A second height at which the upper surface of 81 abuts the lower surface of the screen mask 1 can be selected.

In FIGS. 1 and 7, the slide plate 24b
A cylinder 91 is provided above. A pressing contact piece 93 having a key-shaped side surface is connected to the rod 92 of the cylinder 91. The lower end of the pressing piece 93 hangs down along the outer surface of the mask holder 3, and a pad 94 is mounted on the inner surface. Therefore, the rod 92 of the cylinder 91
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 on the plate 21 or when the cream solder 20 on the plate 21 is scraped onto the screen mask 1. ing. Reference numeral 10 denotes a holder on which the screen mask 1 is mounted.

This screen printing apparatus has the above-described configuration, and the operation will be described next. As shown in FIG. 1, the plate 21 is retracted to the right and the moving plate 50 is retracted to the left.
, 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 squeegees 9 and the motor 13.
Is driven to reciprocately slide the squeegee 9 on the screen mask 1, so that the substrate 80
Is applied with cream solder 20. In this case, the support block 81 has risen 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 out from the pattern holes 2 and adheres to the lower surface of the screen mask 1, so that it must be cleaned appropriately.

When cleaning the cream solder 20 leaked to the lower surface of the screen mask 1, the cream solder 20 attached to the lower surface of the screen mask 1 is scraped off by a cleaning element 64 as shown in FIG. The cream solder 20 attached to the inner edge of the first pattern hole 2 is sucked from the suction port 66 to the suction section 65 by the negative pressure of the suction device 69. 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 at predetermined time intervals during the screen printing operation, or when the screen mask 1 is replaced due to a change in the type of the substrate 80.

When the screen mask 1 is replaced in accordance with the change of 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 adhered 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 in FIG. 3) to move the hole 28 of the arm 29 directly below the cylinder 26 as shown in FIG. 3, where the rod 27 is protruded and the rod 27 is inserted into the hole 28.

Next, when the motor 13 is driven in the reverse direction,
The plate 21 is towed by the sliding plate 6 and the cream solder 2
It moves to the vicinity of 0 (see FIG. 4A). Then, the rod 27 of the cylinder 26 is retracted to be removed from the hole 28, and the rod 23 of the cylinder 22 is projected so that the plate 21 lands 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). Also, as shown in FIG.
The first rod 92 is pulled in, and the pad 94 is pressed against the outer surface of the mask holder 3 to fix the plate 21.

Next, as shown in FIG.
, The squeegee 9 is slid to the right, and the cream solder 20 on the screen mask 1 is scraped up onto the plate 21. Next, the squeegee 9 is raised from the plate 21 by operating the cylinders 41 and 42 and the motor 13, and the rod 23 of the cylinder 22 is retracted to raise the plate 21 to the original position. (See FIG. 4C). In this case, since the screen mask 1 is supported by the support block 81, when the squeegee 9 scrapes the cream solder 20 onto the plate 21, the screen mask 1 does not bend downward, and the pad 94 is used as a mask holder. 3, the plate 21 is fixed on the screen mask 1 by pressing, so that the cream solder 20 can be surely scraped up onto the plate 21.

When the replacement of the screen mask 1 is completed, the plate 21 is landed at an appropriate 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. Upper cream solder 2
0 is scraped out onto the screen mask 1 and the pad 94
Is released, 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 work of applying the cream solder 20 to the substrate 80 is performed. Resume. When the cream solder 20 is scraped from the plate 21, it is desirable that the support block 81 be raised to support the screen mask 1 and that the pad 94 be pressed against the outer surface of the mask holder 3.

As described above, according to the screen printing apparatus, it is possible to automatically collect and replenish the cream solder 20 when the type of the board is changed. When the cream solder 20 is collected and supplied, the squeegee 47 and the cleaning element 64 are separated from the screen mask 1.

In the above-described embodiment, the support block 81 also serves as a support for abutting against and supporting the lower surface of the screen mask 1 when the cream solder 20 is collected, but the support block 81 and the support are separated. Then, the separate support may be caused to perform a desired operation by a horizontal moving means or an elevating means so as to contact the lower surface of the screen mask 1 to support it.

[0029]

As described above, according to the present invention, the cream solder on the screen mask can be automatically collected and the cream solder can be automatically replenished when the type of the board is changed.

[Brief description of the drawings]

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

FIG. 2 is a side view of a cream solder screen printing apparatus 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 during the collection and replenishment of cream solder according to one embodiment of the present invention. FIG. 4B is a side view during the collection and replenishment of cream solder according to one embodiment of the present invention. Side view during recovery and supply of cream solder according to one embodiment (d) Side view during recovery and supply of cream solder according to one embodiment of the present invention

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

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

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

[Description of Signs] 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

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B41F 15/08 B41F 15/26 B41F 15/40 H05K 3/12

Claims (2)

(57) [Claims] 1. A screen mask, a squeegee for sliding a top surface of the screen mask and applying cream solder to a substrate through a pattern hole formed in the screen mask, and a sliding means for sliding the squeegee. A support block that supports the substrate from below, and a lifting unit that moves the support block up and down to move the substrate close to the lower surface of the screen mask and 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 the support from the lower surface; and a cream solder recovering device provided above the screen mask. And a vertically moving means for moving the plate up and down so that the plate is grounded on the upper surface of the screen mask and raised from the screen mask. 2. The cream solder screen printing apparatus according to claim 1, wherein said support block also serves as said support.