JP2679097B2 - Screen printing machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a screen printing machine for applying cream solder to a substrate for soldering electronic components.

(Prior Art) When a paste such as cream solder is printed on a substrate by a screen printing machine, the paste easily leaches to the lower surface from the pattern opening formed in the screen mask and adheres to the lower surface. There is a problem in that this is transferred to the substrate that is pressed against the lower surface of the and is easily stained. For this reason, as shown in FIG.
In the state where the 0 and the substrate 101 are separated from each other, the cleaning unit 102 is moved forward and backward between them to remove the cleaning unit 102.
It is known that the lower surface of the screen mask 100 is cleaned by the cleaning roller 103 provided in the. 104 is a squeegee, 105 is a paste such as cream solder, 106 is a table, and 107 is a table drive motor.

(Problems to be Solved by the Invention) However, the above-mentioned conventional one requires a motor 108 for moving the cleaning unit 102 forward and backward separately from the table driving motor 107, which makes the device complicated,
There was a problem that it became larger. Furthermore, each motor 107,108
Since each must be controlled separately, there is a problem that the control means is complicated and troublesome.

Therefore, an object of the present invention is to provide a screen printing machine that does not require a motor for moving a cleaning unit forward and backward, and can simplify the size of the apparatus and the control means.

(Means for Solving the Problem) To this end, the present invention provides a positioning portion of a substrate composed of an XY table, and screen printing in which a paste is printed on the upper surface of the substrate by a screen mask and a squeegee above the positioning portion. And a cleaning unit for cleaning the paste adhering to the lower surface of the screen mask in a state where the substrate and the screen mask are separated from each other. By providing the connecting portion for connecting, the Y table driving unit is driven to move the X table to the Y
When sliding in the direction, the cleaning section is made to accompany the X table so that the lower surface of the screen mask is wiped.

Further, the connecting portion is adapted to be detachably connected by being driven by a driving portion.

(Operation) In the above configuration, when performing the predetermined printing on the substrate, first the XY table is driven to position the substrate at the predetermined printing position, and then the substrate is pressed against the lower surface of the screen mask of the screen printing unit. Next, a paste such as cream solder is printed on the substrate by sliding the squeegee on the upper surface of the screen mask.

When cleaning the screen mask, the screen mask and the substrate are separated from each other, and then the Y table is driven so that the cleaning unit is moved along with the X table and moved back and forth in the Y direction to remove the paste attached to the lower surface of the screen mask. Clean it. Further, by connecting and disconnecting the connecting portion by driving the driving portion, the X table and the cleaning portion can be automatically connected and disconnected. This cleaning work may be performed regularly or at any time.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is an overall perspective view of a screen printing machine. The screen printing machine is provided with a positioning portion A of a substrate 1 including XYZ tables 2, 3, 4 and a turntable 5 and above the positioning portion A. The screen printing section B is provided and a cleaning section C for cleaning the screen mask 15 is provided.

The substrate 1 is conveyed onto the turntable 5 by the carry-in conveyor 6 arranged in the X direction, fixed by the clamp portion 7, and then positioned at a predetermined position by sliding the XY tables 2 and 3, and further the Z table. When the print table 4 is moved up, the lower surface of the screen mask 15 is pressed to print a predetermined pattern, and when the printing is completed, the Z table 4 is moved down and is carried out by the carry-out conveyor 8 arranged in the same direction as the carry-in conveyor 6. It 9,10,11,12,13 are XY table 2,
3, a motor for driving the conveyors 6, 8 and the turntable 5. Reference numeral 14 denotes a board 1 recognition unit provided above the carry-in conveyor 6, which detects a horizontal angle deviation of the board 1 and corrects it by rotating the turntable 5.

Next, the printing unit B will be described with reference to FIG.

A screen mask 15 is held by a mask holder 16, and the screen mask 15 has openings (not shown) such as circuit patterns. 1
7, 17 are squeegees that slide on the upper surface of the screen mask 15,
Reference numeral 18 is a paste such as cream solder put between both stages 17 and 17, and 19 is a squeegee holder. Reference numeral 21 is a linear motor, 22 is a rod thereof, the squeegee holder 19 is moved forward and backward in the Y direction by driving the motor 21, and the squeegees 17, 17 slide on the upper surface of the screen mask 15 to form a pattern on the substrate 1. Printed. In Figure 1, 23,23
Is a cylinder for pressing the squeegees 17, 17 against the upper surface of the screen mask 15, 24 is a guide rail of the squeegee holder 19, and 20a, 20a are lifting guide rods of the squeegee holder 19.

Next, the details of the cleaning unit C will be described with reference to FIG.

26, 26 are guide rails of the cleaning section C,
The Y table 3 is arranged on both sides of the Y table 3 in parallel therewith.
27 and 28 are base plates that slide on the rails 26 and 26 in the Y direction, and the following components are mounted on the base plates 27 and 28.

Reference numeral 30 denotes a wiping unit, which includes a roller 31 made of an elastic material such as rubber or soft resin, and a roll paper 32 circling along the roller 31, and the roller 31 is the screen mask.
The paste is elastically contacted with the lower surface of 15 and is conveyed in the Y direction by means to be described later to wipe the paste attached to the lower surface of the screen mask 15. Reference numeral 33 is a tension roller for the roll paper 32.
35 is a support frame standing on the base plate 27, 36 is a guide portion 37
Cleaning unit mounted on the support frame 35 via the
30 support brackets. Reference numeral 38 denotes a lift drive cylinder for the bracket 36. The drive of the cylinder 38 moves the bracket 36 up and down to press the wiping portion 30 against the lower surface of the screen mask 15. Reference numeral 40 is a motor for driving the roller 31 arranged on the bracket 36, and includes pulleys 41, 42 and a timing belt 4
The roller 31 is rotated in the F direction via 3. Reference numeral 32a denotes a roll of the roll paper 32, and a pressing plate 45 elastically contacts the upper surface of the roll paper 32 by the spring force of a spring 46 to apply a constant brake. Reference numeral 47 is a take-up roller for the roll paper 32, 48 is a free wheel mounted on its shaft, 49 is an arm coaxially attached to the free wheel 48, and a cylinder 50 is arranged on the base plate 28. The rod 50a of the roller pushes the arm 49 forward to rotate the take-up roller 47 and roll paper 32
To wind up. Reference numeral 51 denotes a cleaning liquid jetting unit disposed above the roll paper 32, and the roll paper is provided along the shaft 52.
The cleaning liquid is jetted from the noise 53 to the roll paper 32 by sliding in the width direction K of 32.

Next, the conveying means of the cleaning section C will be described with reference to FIGS. 3 (a) and 3 (b).

In FIG. 3 (a), 61 is an engaging plate mounted on the side surface of the X table 2, 62 is a cylinder as a drive unit arranged on the base plate 27, and a rod 62a projects upward. The engaging plate 61 is bent in a hook shape, and its end is a rod 62a.
An engaging hole 61a is formed extending upward, and the rod 62a is projected and retracted by the driving of the cylinder 62 and detachably engages with the engaging hole 61a. That is, the engaging plate 61 and the cylinder 62 are
A connecting portion 60 that detachably connects the table 2 and the cleaning portion C is configured. The connecting portion is not limited to that of this embodiment, and for example, the driving portion may be a cylinder.
A solenoid may be used instead of 62.

The present apparatus has the above configuration, and the operation will be described next.

The substrate 1 conveyed onto the turntable 5 by the carry-in conveyor 6 is positioned by the XY tables 2 and 3, and is brought into contact with the lower surface of the screen mask 15 by the elevation of the Z table 4. Then, the squeegees 17, 17 slide on the upper surface of the screen mask 15, and the paste 18 is printed on the substrate 1. Next, the Z table 5 descends, and the printed board 1 is finished.
Are carried out by the carry-out conveyor 8.

The cleaning of the screen mask 15 is performed in a state where the substrate 1 descends and is separated from the screen mask 15. That is, in this state, the cylinder 62 is driven, the rod 62a thereof is engaged with the engagement hole 61a, and the cleaning section C is connected to the X table 2. Next, the motor 10 of the Y table 3 is driven to drive the X
The table 2 is conveyed forward on the Y table 3. Then, the cleaning unit C connected to the X table 2 via the connecting unit 60 slides along the X table 13 on the rail 26 toward the screen mask 15 side. When the cleaning unit 30 reaches directly below the screen mask 15, the cylinder 38 drives to raise the bracket 36, and the cleaning unit 30 moves to the screen mask 15
Make elastic contact with the bottom surface of. In this state, the wiping unit 30 advances and the lower surface of the screen mask 15 is cleaned by the roll paper 32 impregnated with the cleaning liquid (see FIG. 3 (b) above).
After cleaning the screen mask 15, the cleaning unit 30
Descends from the screen mask 15 and the X table 2 starts to retreat, and the cleaning section C again moves to the rail 26.
It slides up and returns to the original position, and the drive portion 62 drives to move the rod 62a away from the engagement hole 61a (see FIG. 3 (a)).
Such cleaning work may be performed regularly, or may be performed at any time when the screen mask 15 becomes dirty.

(Effect of the invention) As described above, the present invention, the positioning portion of the substrate consisting of the XY table, the screen printing portion above the positioning portion, for printing the paste on the upper surface of the substrate by the screen mask and the squeegee, A cleaning device for a screen printing machine, comprising: a cleaning unit for advancing and retracting between the substrate and the screen mask to wipe the paste adhering to the lower surface of the screen mask, the X table and the cleaning unit. By providing the connecting portion for connecting the Y table, when the driving unit of the Y table is driven to slide the X table in the Y direction, the cleaning unit is accompanied by the X table and the lower surface of the screen mask is wiped. Therefore, the drive means for the cleaning section is not required, and the apparatus can be made compact and simple.
Further, since the control means of the drive unit of the Y table also serves as the control means of the cleaning unit, the control unit of the cleaning unit is unnecessary and the control unit can be simplified accordingly. Further, by connecting the connecting portion to the drive portion so as to be detachably connected, the X table and the cleaning portion can be automatically connected and disconnected.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a perspective view of a screen printing machine, FIG. 2 is a perspective view of a cleaning section, and FIGS. 3 (a) and 3 (b) are side surfaces during work. FIG. 4 and FIG. 4 are side views of the conventional one. A: Positioning unit B: Screen printing unit C: Cleaning unit 1 ... Substrate 2 ... X table 3 ... Y table 10 ... Y table drive unit 17 ... Squeegee 18 ... Paste 15 ... Screen Mask 60 …… Coupling 62 …… Cylinder as a driving unit

Claims (2)

(57) [Claims] 1. A positioning unit for a substrate comprising an XY table,
A screen printing section above the positioning section for printing the paste on the upper surface of the substrate with a screen mask and a squeegee, and a forward and backward movement with the substrate and the screen mask separated from each other to remove the paste attached to the lower surface of the screen mask. A cleaning unit to be wiped is provided, and by providing a connecting unit that connects the X table and the cleaning unit, when the X table is slid in the Y direction by driving the driving unit of the Y table, the cleaning unit is cleaned. A screen printing machine, characterized in that the lower surface of the screen mask is wiped with the X table. 2. The screen printing machine according to claim 1, wherein the connecting portion is detachably connected by being driven by a driving portion.