JPH0577357B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a screen printing machine that applies cream solder to a printed circuit board through a screen plate.

(B) Prior Art Generally, in a screen printing machine, by repeating the operation of applying cream solder to a printed circuit board through a screen plate, the amount of cream solder on the screen plate decreases. A worker waiting nearby noticed this and replenished cream solder.

(c) Problems to be Solved by the Invention However, the prior art described above has a drawback in that the operator must always stand by near the screen printing machine and monitor the amount of cream solder remaining on the screen plate.

Therefore, an object of the present invention is to eliminate the need for the operator to monitor the amount of cream solder remaining on the screen board.

(d) Means for Solving the Problems Therefore, the present invention provides a screen printing machine that applies cream solder onto a printed circuit board through a screen plate by a moving operation of a squeegee. a counter for counting the number of times the grasping means has grasped the information, and a notifying means for notifying that cream solder should be replenished onto the screen board when the counted value by the counter reaches a predetermined value. It has been established that

The present invention also provides a screen printing machine that applies cream solder to a printed circuit board through a screen plate by a moving operation of a squeegee; A grasping means for grasping the operation related to the application operation by the squeegee, a counter for counting the number of times grasped by the grasping means, and a counter for replenishing cream solder onto the screen plate when the counted value by the counter reaches a predetermined value. a manual replenishment program that uses the notification means to notify a worker to replenish cream solder; and an automatic replenishment program that automatically replenishes cream solder through the tank. A selection means is provided.

Further, the present invention provides a screen printing machine that applies cream solder to a printed circuit board through a screen plate by moving a squeegee, and detects whether the remaining amount of cream solder on the screen plate is below a predetermined amount. a grasping means for grasping whether the number of operations related to the application operation by the squeegee has reached a predetermined value; and a grasping means for grasping whether the number of operations related to the application operation by the squeegee has reached a predetermined value; a tank for replenishing cream solder onto a board; a sensor for detecting whether the remaining amount of cream solder in the tank has fallen below a predetermined amount;
A notification means is provided for notifying when the sensor detects that the amount is below the predetermined amount.

(e) Effect According to the structure of claim 1, the grasping means grasps the operation related to the application operation by the squeegee, and the number of grasped operations is counted by the counter. When the count value of this counter reaches a predetermined value, the notification means notifies the user to replenish the cream solder onto the screen board, thereby prompting the user to replenish the cream solder.

According to the structure of claim 2, the grasping means grasps the operation related to the coating operation by the squeegee, and the number of grasped operations is counted by the counter. At this time, if the manual replenishment program is selected by the selection means, the notification means notifies the operator to replenish the cream solder onto the screen board, thereby prompting the operator to replenish the cream solder.

Furthermore, when the automatic replenishment program is selected, cream solder is automatically replenished via the tank.

According to the structure of claim 3, the grasping means determines that the remaining amount of cream solder on the screen board has become less than a predetermined amount or that the number of operations related to the application operation using the squeegee has reached a predetermined value. When grasped, the cream solder in the tank is replenished onto the screen board. In this way, when the remaining amount of cream solder in the tank is reduced and the sensor detects that the amount is below a predetermined amount, the notification means notifies the user to that effect.

(F) Embodiment An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 11.

Reference numeral 1 denotes a screen printing machine of the present invention, which has a substrate positioning section 1A and a printing section 1B.

Reference numeral 2 denotes a printed circuit board having positioning holes 3A and 3B, and cream solder is applied to the top surface in a desired pattern so that electronic components (not shown) can be mounted.For example, a rectangular thin plate It is. The substrate 2 is conveyed from the upstream side to the substrate positioning section 1A by a conveyor (not shown).

4A and 4B are conveyor guides that guide the substrate 2 conveyed by the conveyor.

Reference numeral 5 denotes a mounting table on which the substrate 2 is placed and on which the substrate 2 is suctioned and placed on its upper surface by a vacuum pump (not shown).

Reference numeral 6 denotes a moving table provided at the lower part of the mounting table 5, and the mounting table 5 is moved by the movement of the moving table 6. That is, the cylinder 7A that moves the movable table 6 up and down,
The mounting table 5 is moved up and down by the up and down movement of 7B. When the mounting table 5 is raised, positioning pins (not shown) fixed and waiting at the top and bottom are inserted into the positioning holes 3A and 3B provided in the substrate 2 and positioned. This positioned substrate 2 is fixed to the mounting table 5 by vacuum suction. After completing the positioning,
The positioning pin rises, and then, due to the rotation of the drive motor 8, the mounting table 5 is moved by a pair of squeegees 19, which will be described later.
The substrate 2 is moved in a direction perpendicular to the moving directions of the substrates A and 19B, that is, downstream, and is conveyed to the printing section 1B.

Reference numerals 9A and 9B support the substrate 2 at the coating position, and are support stands movable by cylinders (not shown), which also support the substrate 2 on the left and right sides in FIG. 2.

Reference numeral 10 denotes a screen, which has a generally square shape, for example, and consists of a screen plate 11 perforated in a desired circuit pattern and a screen frame 12 surrounding the plate 11. The screen plate 11 may be of a metal/mesh mixed type in which the main portion is made of metal and the periphery of the main portion is made of mesh, or may be made entirely of metal.

A ball screw 13 is rotated by a motor 14 and is fitted into a nut 15. Said nut 15
A squeegee base 16, which is a movable plate, is attached to the squeegee base 16, and the base 16 is reciprocated by the forward and reverse rotation of the motor 14.

17A and 17B are a pair of linear guides that guide the movement of the squeegee base 16.

Reference numeral 18 denotes a tanker having a removable cap 18A on the upper part and filled with cream solder to be applied on the board 2. The upper part of the tank is connected to an air pressure source (not shown), and when a solenoid valve 36 (described later) is opened, the tank is closed. Since pressure is applied to the cream solder in the nozzle 18B, the cream solder is supplied onto the screen plate 11 from the nozzle 18B.

19A and 19B press the screen plate 11 of the screen 10 against the substrate 2, and move in accordance with the movement of the squeegee base 16 as the ball screw 13 rotates due to the rotation of the motor 14 to remove the cream on the screen plate 11. A pair of squeegees apply solder onto the substrate 2. For each coating operation, the pair of squeegees 19A and 19B are alternately lowered and raised by squeegee up and down cylinders 20A and 20B.
That is, when coating the substrate 2 with one squeegee 19A, lower the squeegee 19A and raise the other squeegee 19B, and when applying with the other squeegee 19B, lower the squeegee 19B and raise the squeegee 19B. This is done by raising 19A. This moving operation, that is, the coating operation is detected by a coating operation detection sensor 34 consisting of, for example, a pair of light emitting element and light receiving element, and based on the detection output, the content of a material outage subtraction counter to be described later is subtracted by "1".

21A, 21B, 22A, 22B are squeegee vertical movement guides that guide the vertical movements of the cylinders 20A, 20B of the squeegees 19A, 19B, respectively;
It also serves to attach B to the squeegee base 16.

Reference numeral 23 denotes a warning sensor consisting of a proximity switch that detects when the remaining amount of cream solder in the tank 18 has decreased to a predetermined amount, and is operated by a float (not shown) wrapped around a metal ring in the tank 18. It is something to do.

24 is a keyboard 25 as an input device for setting various data, a screen selection key 27A of the CRT 26,
Keys 27B and 27C for selecting automatic or manual replenishment, a start key 28 for starting the cream solder replenishment operation, and a reset key 2
9, the keyboard 2
Various data are generated by each key operation of 5.

Reference numeral 30 denotes a CPU as a control device, which performs given control related to various data settings and control related to the cream solder replenishment operation based on various information in response to each key operation.

31 is a storage device for storing various setting data set by the keyboard 25;
RAM, 32 is ROM that stores the program, 3
3 is an interface.

Next, the cream solder replenishment data setting operation will be described in detail.

First, when the screen selection key 27A of the CRT 26 is pressed, a screen as shown in FIG. 7 showing the data setting mode appears.

Then, the cursor instruction key 2 on the keyboard 25
5A, move the cursor (not shown) to the "0" position indicating "no" function of "EMPTY STOP FUNCTION" (material out automatic stop function), or press the "1" number key 25B,
The function can be set to "Yes". Similarly, move the cursor to "UNTILEMPTY TIMES" (the number of operations that will run out of material, in other words, screen plate 1).
Move it to the "000" position and set it to "050", which indicates the number of printing application operations from the time when cream solder is replenished onto the screen board 11 until the cream solder on the screen board 11 is expected to run out. , Next, move the cursor to the "000" position indicating the number of "UNTIL NOTICE TIMES" (the number of operations from the time when the cream solder on the screen board 11 is out of material until the material runs out), and select "010". and set "DISPENCE TIME" (time to replenish cream solder from tank 18 onto screen board 11).
Set "00" indicating the time to "05" (meaning 5 seconds). This set data is controlled by the CPU 30 to be written to a predetermined area of the RAM 31.

The CPU 30 controls the content of the material outage subtraction counter to be subtracted by "1" based on the detection output from the detection sensor 34 for each coating operation, but does not subtract the content of the material outage counter. Since the contents of this material outage counter can be displayed on the CRT 26, the user can confirm the set value.

That is, the number of times "50" set in "UNTIL EMPTY TIMES" is stored in the material out counter and material out subtraction counter in the RAM 31,
The number of times "10" set in "UNTIL NOTICE TIMES" is stored in the material out notice counter in RAM31, and the number of seconds "5" set in "DISPENCE TIME" is stored in the dispense timer in RAM31.

Further, when either automatic or manual is selected using the keys 27B and 27C, the selection result is stored in the automatic/manual switching memory in the RAM 31.

As a result, when the number of movements of the squeegee reaches 50, the content of the material outage subtraction counter becomes "0", and the cream solder in the tank 18 is removed from the screen plate 1 by opening the solenoid valve 36 for 5 seconds.
You can replenish on top of 1.

When the CPU 30 determines that the cream solder has run out and the squeegees 19A, 19B cannot perform the application operation, the notification device 37 notifies the user of the material shortage abnormality by sound, light, etc.

When the material automatic replenishment mode is selected by the key 27B, the material outage notice display device 38 indicates that the remaining amount of cream solder in the tank 18 has decreased to a predetermined amount, for example, an amount that can be applied approximately 20 times. When the advance notice sensor 23 detects this, the CPU 30
The system is controlled to notify the user by sound, light, etc. via the interface 33, and prompts the user to replenish the supply. Furthermore, when the manual replenishment mode is selected by the key 27C, the device 38 performs a coating operation after cream solder is replenished onto the screen plate 11, and the material outage subtraction counter is decremented. If it matches the setting value, CPU30
The system is controlled to notify the user by sound, light, etc. via the interface 33, and prompt the user to replenish the supply.

The operation of the above configuration will be explained below.

First, the mounting table 5 is located below the transport level of a conveyor (not shown), and the printed circuit board 2 placed on the conveyor is transported and positioned on the mounting table 5, and the conveyor stops. Next, the mounting table 5 is placed on the cylinder 7.
A, 7B raises it above the conveyance level, and the corresponding platform 5
With the substrate 2 suctioned and placed thereon, the drive motor 8 operates to move the substrate 2 together with the moving table 6 to the printing section 1B. The substrate 2 is further raised to the printing level by the cylinders 7A and 7B, and is supported by the support stands 9A and 9B. After that, one squeegee 19A descends as shown in FIG. 2 and further moves in the C direction. Along with this movement, screen plate 1
After applying the cream solder on the board 1 to the board 2 through the opening in the board 11, the squeegee 19A
to rise. After that, the suction of the mounting table 5 is released, and the support by the supporting tables 9A, 9B, etc. is also released, and the cylinders 7A, 7B lower the tables 5, 6 to below the conveyance level of the conveyor, and the conveyor The substrate 2 is placed on top and transported. Then, the drive motor 8 returns the tables 5 and 6 to their original positions, and one printing application operation is completed.

In this way, the application operation is repeated, and the operation related to replenishing the cream solder will be described below with reference to FIGS. 8 to 11.

First, the CPU 30 determines whether to replenish the screen board 11 automatically or manually based on the contents of the automatic/manual switching memory in the RAM 31, and then presses the key 2.
The case where the automatic replenishment mode is selected by 7B will be explained based on FIG. tank 18
If there is no cream solder in the inside and the material out subtraction counter becomes "0" and the notification device 37 displays a "material out abnormality display" (hereinafter also referred to as "material out display"), the screen printing machine prints and coats the solder. No action is taken. If there is no "material out abnormality display", the coating operation will be performed.

Here, even if there is cream solder in the tank 18, if the notice sensor 23 detects that the amount is below a predetermined amount, the material out notice display device 38
This notifies the user and urges the user to replenish cream solder into the tank 18. Users only need to replenish it.

To replenish cream solder, cream solder may be directly injected into the tank 18 and replenished,
If the tank 18 itself is replaceable, it may be replaced with a tank 18 already filled with cream solder.

When the coating operation is performed on the printed circuit board 2 as described above, the coating operation is detected by the sensor 3.
4 is detected and the content of the material outage subtraction counter is set to "1".
Subtract by increments. Further, if the notice display device 38 is not displaying a notice and the content of the material out subtraction counter is "0", the solenoid valve 36 of the tank 18 is opened to replenish cream solder onto the screen board 11. At the same time, a dispense timer is set, and when the set value of 5 seconds has elapsed, the valve 36 is closed.

Next, manual replenishment when the manual replenishment mode is selected by the key 27C will be explained based on FIG. 10. This case is an example of use in which the tank 18 is not used. As mentioned above,
Similar to the automatic replenishment mode, the detection sensor 34 detects the coating operation and subtracts the content of the material outage subtraction counter by "1".

When the coating operation continues and the content of the material outage subtraction counter reaches 10 times, which is the content of the material outage notice counter, the material outage notice display device 38 instructs the user to replenish cream solder onto the screen board 11. to be notified.

Next, operations after the automatic replenishment subroutine shown in FIG. 9 in the automatic replenishment mode and the manual replenishment subroutine shown in FIG. 10 in the manual replenishment mode will be explained based on FIG. 11. FIG. 11 shows the material outage detection subroutine. First, tank 1 in automatic replenishment mode
The cream solder in 8 is reduced to the amount that turns on the warning sensor 23, and the material outage subtraction counter becomes "0".
When it is determined that there is no cream solder on the screen board 11, or when the material outage subtraction counter becomes "0" in manual replenishment mode (example of use when the tank 18 is not used), there is no cream solder on the screen board 11. If it is determined that there is no cream solder in
The CPU 30 stops displaying the material shortage error.

On the other hand, in both the automatic replenishment mode and the manual replenishment mode, if the material outage notice display device 38 indicates that the remaining amount is low without the material outage being displayed, the printing application operation is performed. When the CPU 30 determines that the content of the material outage subtraction counter has become "0", the material outage display and notification device 37 performs this operation. At this time, in Figure 7
If the EMPTY STOP FUNCTION is set to ``1'' and the material out automatic stop function is ``enabled,'' an indication that the material is out is displayed and the printing and coating operation is stopped.

In addition, when the content of the subtraction counter is not "0", tank 1 in the automatic replenishment mode
When the reset key 29 is operated after cream solder is replenished into the screen board 11 in the manual replenishment mode or after cream solder is replenished onto the screen board 11 in the manual replenishment mode, the CPU 30 activates the material out warning display device 3.
Stop displaying 8.

And in the automatic replenishment mode, the advance notice sensor 2
If the remaining amount of cream solder detected in step 3 is more than the predetermined amount, the contents of the material out subtraction counter are cleared and returned to the initial state "050".If the manual replenishment mode is in manual replenishment mode, the contents of the material out subtraction counter are also cleared. Clear and return to initial state.

In the present embodiment, after the material-out notice display device 38 notifies that the remaining amount of cream solder in the tank 18 has decreased to a predetermined amount, an arbitrary number of steps are performed until the material-out subtraction counter reaches "0". Although it is possible to set the number of times of application, it is also possible to set the operation time of the application operation arbitrarily. At that time, the unit of the number set by the number key 25B is seconds.

In addition, in this embodiment, in order to count the application operation of the squeegee, the application operation detection sensor 34 detects and counts the movement operation of the squeegee 19A, 19B.
You can count the instructions of the CPU 30, or use the squeegee 1.
The movement of 9A and 19B rising or falling
The CPU 30 may count commands or a sensor may be provided to count the number of detections, the operation of conveying the printed circuit board 2 to the board positioning section 1A by a conveyor, the operation of sucking the board 2 onto the mounting table 5, The CPU 30 grasps and counts the commands of the CPU 30 for operations related to coating operations, such as positioning operations using positioning pins for the substrate 2, moving operations for the mounting table 5, and operations for discharging the printed substrate 2, or detects these operations using sensors. It is also possible to understand and count it.

Furthermore, in this embodiment, in the automatic replenishment mode, the solenoid valve 36 connected to the air pressure source was opened to replenish cream solder in the tank 18 to the screen plate 11, but the air pressure source was always communicated with the tank 18. An opening/closing member may be provided to constantly apply pressure to the cream solder inside and open/close the outlet of the nozzle 18B, and the opening/closing member may be opened when it is desired to supply cream solder.

(G) Effects of the Invention As described above, the present invention provides a method for determining whether, when the cream solder on the screen plate decreases due to repeated application operations, whether the operator is notified to replenish the solder or whether the solder is automatically replenished. By making it possible to programmatically select the amount of cream solder remaining on the screen board, the operator does not have to constantly monitor the amount of cream solder remaining on the screen board, reducing the burden on the operator.

Furthermore, the present invention can notify the operator when the remaining amount of cream solder in the tank for replenishing the cream solder on the screen board has decreased, so that the operator can fill the tank with cream solder when notified. You can replenish it by injecting it or by replacing the tank itself with one filled with cream solder.
There is no need to constantly monitor the amount remaining in the tank.
The burden on workers is reduced.

[Brief explanation of the drawing]

Figure 1 is a plan view of a screen printing machine to which the present invention is applied, Figure 2 is a diagram showing the coating operation, Figure 3 is a front view of the main parts of the present invention, Figure 4 is a side view, and Figure 5 is the same. 6 is a block diagram of the present invention, FIG. 7 is a diagram showing a CRT display screen, FIG. 8 is a flowchart showing the replenishment operation, FIG. 9 is a flowchart showing the automatic replenishment operation, and FIG. FIG. 10 is a flowchart showing manual replenishment operation, and FIG. 11 is a flowchart showing material shortage detection. 18...tank, 19A, 19B...squeegee, 34...notice sensor, 30...CPU, 31
...RAM, 38... Material out notice display device.

Claims (1)

[Scope of Claims] 1. In a screen printing machine that applies cream solder to a printed circuit board via a screen plate by a moving operation of a squeegee, a grasping means for grasping the operation related to the coating operation by the squeegee, and the grasping means The screen is characterized in that it is provided with a counter for counting the number of times the screen has been grasped, and a notification means for notifying that cream solder should be replenished onto the screen board when the count value by the counter reaches a predetermined value. Printer. 2. In a screen printing machine that applies cream solder to a printed circuit board via a screen plate by a moving operation of a squeegee, a tank filled with the cream solder and replenishing the cream solder onto the screen plate, and an application operation by the squeegee. a grasping means for grasping the operation related to the grasping, a counter for counting the number of grasping by the grasping means, and a notification that cream solder should be replenished on the screen board when the counted value reaches a predetermined value by the counter. a selection means for selecting between a manual replenishment program that causes the notifier to notify an operator to replenish cream solder and an automatic replenishment program that automatically replenishes cream solder through the tank; A screen printing machine characterized by being equipped with. 3. In a screen printing machine that applies cream solder to a printed circuit board via a screen plate by moving a squeegee, it is checked whether the remaining amount of cream solder on the screen plate is below a predetermined amount. a grasping means for grasping whether the number of operations related to an operation has reached a predetermined value; and a grasping means for grasping whether the number of operations related to an operation has reached a predetermined value; A tank for replenishing solder,
A sensor for detecting whether the remaining amount of cream solder in the tank is below a predetermined amount, and a notification means for notifying when the sensor detects that the remaining amount is below the predetermined amount are provided. A screen printing machine characterized by: