JPH07241977A - Screen printing machine - Google Patents

Abstract

PURPOSE:To enhance the workability of maintenance by providing a cleaning unit for removing a coating agent stuck to the rear surface of a screen plate so as to draw out the same from the interior of a screen printing machine at the time of maintenance work. CONSTITUTION:In a screen printing machine, the coating agent (solder paste) on a screen plate is printed on a printed circuit board by the movement of a squeezee and the coating agent stuck to the rear surface of a screen plate through the perforations of the screen plate is removed by the cleaning unit 26 arranged under a printing station. In this case, a front door 5 opened when the cleaning unit 36 is drawn out of a screen printing machine at the time of the maintenance of the cleaning unit 36 is provided to the machine main body 1. The cleaning unit 36 is guided by a rail 68 to be moved to the area under the screen plate and freely drawn out by the revolution of a belt jointed by a belt joint.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for printing a coating material on a screen plate on a printed circuit board by moving a squeegee through the screen plate. The present invention relates to a screen printing machine provided with a cleaning unit for cleaning.

[0002]

2. Description of the Related Art As a conventional technique of this kind, there is one disclosed in Japanese Patent Application Laid-Open No. 4-199768 previously filed by the present applicant. However, since the cleaning unit that wipes the coating material adhering to the back surface through the opening of the screen plate with the cleaning paper was fixed inside the printing machine, each consumable item of the cleaning unit, for example, during various maintenance such as replacement of the paper, etc., The worker had to extend his arm inside the printing machine to perform replacement work, and the workability was poor.

Also, instead of paper, a cleaning squeegee is brought into contact with the back surface of the screen plate, and the coating material is sucked into the collection box with vacuum air through a hose connected to a vacuum source.
The same drawback was found in the maintenance work of replacing the filter for collecting the sucked coating material.

[0004]

Therefore, it is an object of the present invention to improve workability of various maintenance such as replacement of various consumables.

[0005]

Therefore, according to the present invention, the coating material on the screen plate is printed on the printed circuit board by the movement of the squeegee through the screen plate, and is adhered to the back surface through the opening of the screen plate. In a screen printing machine equipped with a cleaning unit that cleans the applied coating material, the cleaning unit placed on the unit mounting table can be pulled out from the inside of the printing machine to a place where maintenance can be easily done during maintenance work It was placed in.

[0006]

With the above construction, at the time of maintenance of the cleaning unit detachably arranged on the unit mounting table, the unit is pulled out from the inside of the printing machine to a place where maintenance work is easy.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 shown in FIG. 1 is a main body of a screen printing machine, and an operation unit 3 including a CRT 2 screen is arranged on the front surface. Four
Is an indicator light that informs the operator by turning on, blinking, or turning off the operating state during production operation or abnormal stop. 5 is a cleaning unit 36 described later.
Is a front door that is opened when the unit 36 is pulled out from the inside of the printing machine at the time of maintenance or the like.

FIG. 2 is a view showing the inside of the main body 1, and 7 is a supply conveyor for supplying a printed board 8 (see FIG. 4) conveyed from an upstream device (not shown) to the mounting table 9, which is mounted on the mounting table 9. The substrate 8 is placed while being positioned by a positioning mechanism (not shown). Reference numeral 10 is an XY-θ table which holds the mounting table 9, and is composed of an X table 11, a Y table 12 and a θ table 13 as shown in FIG.

The X table 11 is moved along the pair of X guide rails 16 provided on the base 15 (see FIG. 2) by the rotation of the X screw shaft 18 by the driving of the X motor 17 and the X nut body 19 through the X nut body 19. Move in the direction. The X guide rail 16 extends in a range from a positioning station where the substrate 8 is placed by the placing table 9 to a printing station which will be described later, XY-θ.
The table 10 is movably provided.

The Y table 12 is moved in the Y direction along a pair of Y guide rails 24 provided on the X table 11 via a Y nut body 23 by the rotation of a Y screw shaft 22 driven by a Y motor (not shown). To do. Also, θ table 1
3 is rotated by the drive of the θ motor 26 through a θ rotation mechanism (not shown). Reference numeral 28 shown in FIG. 4 denotes a screen, and a screen plate 30 provided with an opening 29 (see FIG. 5) as a printing pattern hole formed corresponding to a desired circuit pattern of the substrate 8, and the plate 30. Surrounding screen frame 3
1 and 1.

Reference numeral 33 shown in FIG. 2 is a squeegee base mounted on a base (not shown). Then, the print motor 32
Is transmitted to the drive pulley to rotate the drive pulley, and the squeegee belt suspended between the drive pulley and the driven pulley is moved, whereby the squeegee base 33 attached to the belt is moved. A pulse motor is used as the print motor. Alternatively, a servo motor may be used.

Two squeegees 34 facing each other are attached to the squeegee base 33 so as to be vertically movable by the operation of a squeegee vertical cylinder (not shown). Then, the mounting table 9 is moved via the XY-θ table 10, and the squeegee 34 is lowered while the substrate 8 on the mounting table 9 is positioned at the printing station, and the screen 28
While moving the screen plate 30 of
The solder paste W supplied on the screen plate 30 is printed on the substrate 8 through the openings 29 provided corresponding to the pattern of the substrate 8.

The angle of the squeegee can be variously changed by an angle adjusting mechanism (not shown) according to the viscosity of the solder paste W, the hole diameter of the printing pattern, the hole pitch, and the like. 2 and 5
Reference numeral 36 shown in FIG. 6 is a cleaning unit which is prepared at the lower position of the printing station and cleans the solder paste W adhering to the back surface of the plate 30 through the opening 29 of the screen plate 30.
Is movable below the screen plate 30 in any direction, and is joined to the belt 39 by a belt joint 38.
The belt 39 is wound around a drive pulley 41 driven by a cleaning unit motor 40 and a driven pulley (not shown), and the cleaning unit 36 is moved by the rotation of the motor 40.

Reference numeral 43 denotes an opening 29 on the lower surface of the screen plate 30.
As a wiping strip for wiping off the solder paste W dripping through the paper, a wiping paper made of, for example, a non-woven fabric, the paper 43 wound around the supply roller 44 as shown in FIG. 5 is driven by a drive motor 45 (see FIG. 6). ) The take-up roller 46, which is rotated by the drive of FIG. Reference numeral 48 is a paper pressing shaft for pressing the lifting of the paper 43, which is inserted into the groove 49 of the main body of the unit 36 and is positioned so as not to come off by the elastic force of the stopper 50 made of an elastic body.

Reference numeral 52 denotes a cleaning squeegee for pressing the paper 43 against the back surface of the plate 30. A rod 54 of a cylinder 53 is fixed to the cleaning squeegee. The cylinder 53 is driven by a linear guide 55 to move up to the back surface of the screen plate 30. (State shown by the solid line in FIG. 5). In this state, while suctioning from the suction port 58 by the suction force from a vacuum source (not shown) via the hose 57, the paper 43 is moved as the cleaning unit 36 is moved by the rotation of the motor 40.
By moving the squeegee 52, the solder paste W attached to the back surface of the plate 30 is wiped off.

Reference numeral 59 is a supply nozzle for injecting a cleaning liquid in a tank (not shown) onto the paper 43, and has a plurality of ejection ports (not shown) in the longitudinal direction. Reference numeral 60 denotes a connector that connects the suction mechanism, the piping, and the electric system to the supply source and is removable. The cleaning unit 36 can be pulled out from the inside of the printing machine by opening the front door 5 of the main body 1. That is, when the front door 5 is opened by rotating it about the shaft 62 as a fulcrum, the inner surface 63 of the front door 5 becomes somewhat lower as shown in FIG. 6, but the inner surface 63, the guide base 64, and the unit mounting base 65 are reduced.
The upper surfaces of are substantially parallel. When the operator pulls the cleaning unit 36 in the direction of the arrow through the handle 66, the unit 36 causes the engaging portions 72 provided on the upper surface of the unit mounting table 65 at the lower portions of both side surfaces of the unit 36 to move in the moving direction. And a pair of guide bodies 7 each having an inverted L-shaped cross section that guides them upward and prevents them from floating upward.
3, the rail 68, which serves as a guide body for guiding the guide table 64 along the moving direction provided on the guide table 64, slides along the side surface of the engaging portion 72 of the unit 36. Similarly, the rail 68 on the inner surface 63 of the front door 5 is moved to a position regulated by the stopper 67. The cleaning unit 36 in FIG. 6 is in a state where the squeegee 52 is raised, but when the unit 36 is actually pulled out, the squeegee 52 is lowered.

Reference numeral 70 denotes a discharge conveyor for discharging the printed substrate 8 to the downstream side device. The operation will be described below with the above configuration. When the printing operation is started, first, the mounting table 9 located on the positioning station side is placed.
Is below the transfer level of the supply conveyor 7, and when the substrate 8 transferred from the upstream device by the conveyor 7 is positioned above the mounting table 9, the conveyor 7 is stopped.

Next, the mounting table 9 is raised above the transfer level by a vertical movement mechanism (not shown), and the substrate 8 is mounted on the mounting table 9. The mounting table 9 on which the substrate 8 is mounted is moved to the printing station by the XY-θ table 10. And
For example, the squeegee 34 on the right side shown in FIG. 4 is adjusted to a desired squeegee angle by the angle adjusting mechanism, and the squeegee up / down cylinder is driven to descend onto the screen plate 30. The solder paste W supplied on the screen plate 30 by being moved leftward in FIG. 4 based on a desired squeegee speed by driving the print motor 32 is applied to the plate 3
Printing is performed on the substrate 8 through the openings 29 formed by 0.

Thus, when printing in the forward direction is completed, the right squeegee 34, which is being lowered by driving the cylinder, is raised, and the left squeegee 34 is likewise lowered, by driving the cylinder to perform printing in the backward direction. The squeegee 34 is raised. In addition, when only the printing in one direction is required, the two substrates 8 can be printed by the printing in the forward direction and the printing in the backward direction.

After the printing is finished, the positioning of the mounting table 9 is released, the table 9 is lowered below the carrying level by the vertically moving mechanism, and the substrate 8 is discharged by the discharge conveyor 70.
After the substrate 8 is discharged, the mounting table 9 is returned from the printing station to the positioning station by the table 10 to prepare for the next supply of the substrate 8. Thereafter, the printing operation is continued in the same manner.

In this manner, the printing operation of the substrate 8 is repeated, and the cleaning operation of the back surface of the screen plate 30 is performed after the predetermined number of printing operations is performed based on the printing number data stored in the storage device (not shown). Done. The automatic cleaning operation will be described below. First, after printing a predetermined number of sheets and returning the mounting table 9 to the positioning station, the cleaning unit 36 is rotated below the screen plate 30 by the rotation of the cleaning unit motor 40 to rotate the belt 39 as shown in FIG. It moves along the guide rail 37.

Next, the cylinder 53 is moved upward, and the cleaning squeegee 52 presses the paper 43 against the back surface of the screen plate 30 while pulling out the paper 43 from the supply roller 44. Then, the cleaning portion motor 40 rotates while sucking from the suction port 58 connected to the vacuum source through the hose 57, so that the solder paste W is wiped off by the paper 43. At this time, since the paper 43 functions as a filter, the solder paste W does not enter the suction port 58 side. In addition, before the wiping with the paper 43, the cleaning liquid is sprayed from the supply nozzle 59 to the paper 43. still,
When the cleaning liquid is not required, it may be controlled by a control device (not shown) so that the cleaning liquid is not supplied.

After completion of the wiping operation, the winding roller 4
The squeegee 52 descends after 6 is rotated to wind up the dirty paper surface. The unit 36 may be moved while successively winding the paper 43 during the wiping operation. In addition, for example, when it is detected by a detection mechanism (not shown) that the paper 43 has run out,
The control device stops the printing operation and informs the operator of that fact via the indicator lamp 4. Note that a buzzer or the like may be used instead of the indicator light 4. Upon receipt of the notification, the operator drives the cleaning unit motor 40 from the closed state of the front door 5 as shown in FIG. 7 to the predetermined drawing position of the cleaning unit 36 as shown in FIGS. 1, 6 and 8. After moving and opening the front door 5, the handle is pulled and the cleaning unit 36 is pulled out from the inside of the printing machine to the front side as shown in FIG. At this time, the suction mechanism, the piping, and the electric system are disconnected from the connector 60 portion. That is, the suction mechanism is already stopped when the unit 36 is pulled out, and the supply of air to the pipe is stopped by closing a mechanical valve (not shown) when the unit 36 is pulled out.
Further, the electric system is designed to be cut off when the unit 36 is located at the pull-out position. And front door 5
The paper 43 of the unit 36 drawn up is replaced with a new paper 43. Further, during various maintenance such as replacement of other consumables such as when replenishing the cleaning liquid, the workability is improved by pulling out the unit 36 from the inside of the printing machine to a position where maintenance work can be easily performed. Further, in this embodiment, the paper 43 is used instead of the filter at the time of suction at the time of cleaning, but in the case of the direct suction method, for example, the work at the time of maintenance for replacement of the filter installed in the suction mechanism. You can improve the sex.

Further, in the case where the cleaning operation is controlled after the printing operation is performed a plurality of times,
If various maintenance works such as replacement work of consumables are carried out at another place after being taken out from the front door 5, the work is once stopped and the unit 36 is taken out to perform various maintenance works such as replacement of consumables. During that time, the front door 5 can be closed to restart the printing operation. Then, after the maintenance work is completed, when the printing on the substrate 8 during the printing operation is completed, the printing machine is stopped again, and the unit 36 is set so that printing on several substrates 8 can be performed during the maintenance work time. You can do it.

[0025]

As described above, according to the present invention, since the unit for performing various maintenance work such as replacement of consumables can be pulled out from the inside of the printing machine to a place where it is easy to work, the workability of various maintenance such as replacement of consumables is improved. Is improved.
Further, if various maintenance work such as replacement work is performed outside the printing machine, the production operation can be restarted while the work is being performed, and the productivity is improved.

[Brief description of drawings]

FIG. 1 is a front view showing a state in which a front door of a main body of a screen printing machine is opened.

FIG. 2 is a diagram showing a screen printing machine.

FIG. 3 is a diagram showing a mounting table.

FIG. 4 is a diagram showing a printing station.

FIG. 5 is a diagram showing a cleaning state by a cleaning unit.

FIG. 6 is a view showing a mechanism for pulling out the cleaning unit from the inside of the printing machine.

FIG. 7 is a front view showing the main body of the screen printing machine.

FIG. 8 is a side view showing a state in which a front door of the main body of the screen printing machine is opened.

[Explanation of symbols]

 1 Main body 5 Front door 9 Mounting table 28 Screen 30 Screen plate 36 Cleaning unit 43 Paper for wiping 52 Squeegee for cleaning 64 Guide table 65 Unit mounting table

Claims (1)

[Claims] 1. A printing unit for printing an application agent on a screen plate on a printed circuit board by moving a squeegee through the screen plate, and comprising a cleaning unit for cleaning the application agent adhering to the back surface through an opening of the screen plate. In the screen printing machine, the cleaning unit arranged on the unit mounting table is detachably arranged on the unit mounting table so that the cleaning unit can be pulled out from the inside of the printing machine to a place where maintenance work can be easily performed during maintenance work. Printer.