JP3301776B2 - Coating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for coating a coating agent in a syringe on a printed circuit board with a coating nozzle.

[0002]

2. Description of the Related Art Japanese Patent Publication No. Hei.
There is a technique disclosed in Japanese Patent No. 5998, but since the discharge operation of the coating material for the next coating is started at the time when the coating operation is completed, the discharge is performed in view of the moving time to the next coating position and the like. Has been completed, and the time until application to the next application position has varied. For this reason, the amount of the coating agent discharged during the standby time until the coating may change.

For this reason, as described in the specification attached to Japanese Patent Application No. 4-7957, when the application nozzle reaches the lower limit position, the opening operation command signal for the discharge air to the valve is stopped.
It proposed a controlled technology to (see FIG. 21).

However, even when the valve is closed , the pressure in the syringe does not immediately return to the atmospheric pressure. There is a fall time as shown in FIG. 22, and the discharge amount still varies.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to prevent variations in the discharge amount.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a coating apparatus for coating a coating agent in a syringe on a printed circuit board with a coating nozzle, wherein the coating agent is ejected to the tip of the coating nozzle. A valve for blowing the discharge air supplied from the air source, and an opening operation command signal for the valve;
After the output , the pressure inside the syringe becomes atmospheric pressure while the application nozzle descends and is at the lowest position.
The application nozzle descends to the lowest position so that application stops
And a control device for stopping the opening operation command signal of the valve before the operation .

Further, the present invention relates to a coating apparatus for coating a coating agent in a syringe on a printed board with a coating nozzle.
A valve for blowing a discharge air supplied from an air source into the syringe to discharge the coating agent to the coating nozzle tip, and a discharge pressure after the stop of the opening operation command to the valve until the discharge pressure returns to the atmospheric pressure. Time
A storage device for storing a relational expression of the fall time during which the application of the coating material from the valve continues, and a fall time after the stop of the opening operation command to the valve is calculated based on the relational expression stored in the storage device. Calculator and dispensing nozzle descend to the lowest
While in the position, the pressure in the syringe rises and the fall time obtained from the calculator is passed to the valve so that the fall time elapses.
And a control device for stopping the opening operation command signal .

[0008]

[Operation] From the above configuration, the control device lowers the application nozzle.
The pressure in the syringe and the atmospheric pressure while to the top-limit position
Dispensing so that dispensing of dispensing agent from dispensing nozzle stops
Opening of the valve before the nozzle descends to the lowest position
Stop the command signal.

Further, based on the relational expression of the fall time from the discharge pressure stored in the storage device to the return from the discharge pressure to the atmospheric pressure, the calculation device calculates the opening of the valve during the discharge.
Calculate the fall time after the operation command is stopped, and
The pressure inside the syringe rises and falls while it is at the lowest position
Open operation command signal to the valve so that the
Stop.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

(1) A printed circuit board to which an adhesive as a coating agent is applied for mounting a chip component (not shown), and an XY table (XY table) which is moved XY by an X motor (2) and a Y motor (3). 4) Placed on top.

(6) an adhesive applying unit for applying an adhesive to the printed circuit board (1);
Apply adhesive to In the present embodiment, two are provided. The adhesive application unit (6) is supported by a cam lever (9) via a roller receiver (7) and a roller (8). Reference numeral (11) denotes a cam whose arc diameter changes for each rotation angle, for example, and holds the cam lever (9) via a cam follower (12) provided on the cam lever (9).

An upper and lower motor (13) is a servo motor for rotating the cam (11).
When the cam (11) rotates, the cam lever (9) swings up and down about a fulcrum shaft (14) provided at the other end of the roller (8) of the cam lever (9). The adhesive application unit (6) moves up and down by the vertical swing of the cam lever (9).

(16) An application nozzle for discharging the adhesive and applying the adhesive on the printed circuit board (1). The nozzle (1) having a different application amount for each of the adhesive application units (6).
6) is prepared. (17) is a syringe connected above the nozzle (16) and storing the adhesive.
(18) is an air tube connected to an air supply source for sending compressed air for discharging the adhesive from the nozzle (16). The nozzle (16) is rotated by a rotating mechanism (not shown).

Valves 1 and 2 for supplying air to each nozzle (16) by turning on and opening (19) and (20)
It is provided between an air supply source (not shown) and each syringe (17).

An operation unit (21) for generating various data by operating each key is a keyboard (2) for setting various data.
2) A cursor instruction key (23), a screen selection key (25) of the CRT (24), a start key (26) for starting the coating operation, and a stop key (27) for stopping the coating operation.

(28) is an example of N in the coating operation shown in FIG.
Data such as C data and fall time from the discharge pressure shown in FIG. 20 (valves 1, 2 (19),
(Time from turning off (20) to returning to atmospheric pressure) Approximate expression of fall time for discharge pressure obtained from experimental data showing the relationship

[0018]

(Equation 1)

Is a RAM as a storage device for storing data, and has areas of memories A to I. The moving time of the XY table is stored in the memory A, the {memory I-lower nozzle lower limit time} is stored in the memory B, and the {nozzle lower limit time-time of the memory I} is stored in the memory C. , A memory D stores {memory A-nozzle descent time}, a memory E stores {memory I-maximum discharge allowable time}, and a memory F stores {maximum discharge allowable time-memory I}. , Memory G stores {XY table movement time−table movement allowable time}, memory H stores a fall time, and memory I stores {ejection time (valve ON time) + fall time}. Have been.

(29) is a ROM as a storage device for storing a program relating to the coating operation.

Reference numeral (30) denotes a CPU as a control device for performing overall control of the coating device.

(31) is an interface.

A drive circuit (32) is the X motor (2), Y motor (3), vertical motor (13), valve 1 (19), valve 2 (20), timers 1, 2, 3, and 3.
4, 5, 6, 7, 8, 9, 10 (35), (36),
(37), (38), (39), (40), (41),
(42), (43), (44) are connected.
The set time of the contents of the memory C is set in the timer 1 (35), the set time of the contents of the memory D is set in the timer 2 (36), and the memory B is set in the timer 3 (37).
Is set, the time of {memory B-memory D} is set in timer 4 (38), and the time of timer 5 is set.
The time of {Memory D-Memory B} is set in (39), the set time of the contents of memory D is set in timer 6 (40), and the contents of memory E or memory G are set in timer 7 (41). Is set, and timer 8 (4
In 2), the time of {Memory G-Memory E} is set,
The set time of the contents of the memory F is set in the timer 9 (43), and the discharge time (valve ON) is set in the timer 10 (44).
Time) is set.

The operation will be described below.

First, an operator presses a start key (26) to start the coating apparatus.

The printed circuit board (1) mounted on the XY table (4) is positioned by a not-shown positioning device by a transfer device (not shown).

First, the contents of memories A to F to be used, which will be described later, are cleared. The data of the step number “001” of the NC data shown in FIG. 3 is read, and the moving distance of the XY table (4) in the step 1 from the origin position in the step 1 is calculated by a calculation device (not shown) in the CPU (30).
The ejection time (valve ON time) T in the data is read.
Further, the discharge time may be calculated by a computing device without having the discharge time as data.

Next, the pressure value P1 in the NC data of the step number is calculated by an approximate expression.

[0029]

(Equation 2) To calculate the adhesive fall time Td,
The data is stored in the memory H in the RAM (28). The ejection time is added to the time in the memory H, and the result is added to the RAM (2
8) is stored in the memory I.

Next, the time in the memory I and the nozzle lower limit arrival time X (the nozzle (16) starts to fall (in step 1, the nozzle (16) moves up and down from the origin position above and below the nozzle), and the printed circuit board ( (1) the arrival time at which the adhesive discharged from the nozzle (16) is applied is compared with a comparison device (not shown), and if the time in the memory I is longer, Is stored in the memory B in the RAM (28) and the memory C is set to "0 (zero)". If it is shorter, a value T2 obtained by subtracting the time in the memory I from the nozzle lower limit arrival time X is stored in the memory C in the RAM (28), and the memory B is set to "0 (zero)".

Then, the travel time is calculated from the travel distance, and the value T3 is stored in the memory A. A case where the nozzle descent time Y (descent time from the relation of the pre-installed parts to the position where the nozzle is not further lowered during the movement of the XY table (4)) is shorter than the time in the memory A will be described below.
This will be described with reference to FIGS. 5, 14, and 15.

First, a value T4 obtained by subtracting the nozzle descent time Y from the time in the memory A is stored in the memory D. The time of the memory B is compared with the time of the memory D by the comparison device, and when the memory B is shorter, the XY table (4) is started. Then, the set time of the contents of the memory D is set in the timer 2 (36). The time T5 obtained by subtracting the time of the memory B from the time of the memory D is referred to as a timer T5.
Set to (39). When the timer 5 times out, the valve 1 (19) is turned on and the syringe (17) is pressed to discharge the adhesive. At the same time, the discharge time is set in the timer 10 (44). When the timer 2 times out, the application nozzle (1
6) Start descent. Then, the timer 10 (4
When the time is up in 4), the valve 1 (19) is turned off.
F and clear the contents of the used memory. As a result of the comparison by the comparison device, if the memory B is longer, the valve 1 (19) is first turned on and the discharge time is set to the timer 10 (4) as shown in FIGS.
Set to 4). Then, a value T6 obtained by subtracting the time of the memory D from the time of the memory B is set in the timer 4 (38). When the timer 4 times out, the XY table (4) is started. When the time of the timer 6 (40) in which the time of the memory D is set is up, the nozzle (16) is lowered, and when the time of the timer 10 (44) is up, the valve 1 (19) is turned off and the used memory is cleared. I do.

Next, the case where the nozzle descent time Y is longer than the time of the memory A will be described. in this case,
First, the XY table (4) is started. If the time of the memory B is not larger than 0, the nozzle (16) is lowered by the nozzle descent start command as shown in FIGS. 7 and 14, and at the same time, the time of the memory C is set to the timer 1 (35). set. Then, the timer 1 (3
When the time of 5) is up, the valve 1 (19) is turned on and the discharge time is set in the timer 10 (44). When the time of the timer 10 (44) is up, the valve 1 (19)
Is turned off and the used memory is cleared. Also, as a result of the comparison by the comparison device, the time in the memory B is 0
If it is larger, the valve 1 (19) is turned on and the discharge time is set to the timer 10 (44) as shown in FIGS.
Set to. When the timer 3 (37) in which the time of the memory B is set has timed out, the nozzle (16) is lowered by the nozzle lowering start command,
When (44) times out, turn valve 1 (19) on.
FF and clear the used memory.

Next, the coating operation of step number "002" will be described.

In this case, the nozzle (16) moves up and down from the nozzle standby position. As shown in FIG. 17, the data of the step is read, the travel distance from step 1 to step 2 is calculated, and the ejection time (valve O) in the NC data is calculated.
(N time) Read T. Further, the step number “002”
The pressure value P1 in the NC data of

[0036]

(Equation 3) To calculate the adhesive fall time Td,
The data is stored in the memory H in the RAM (28). The ejection time of step 2 previously read and the time in the memory H are added, and the result is stored in the memory I in the RAM (28). When the nozzle (16) comes to the XY table (4) start position (point A shown in FIG. 4, etc.), the XY table (4)
Start. Next, if the time in the memory I is shorter than the maximum allowable discharge time, a value obtained by subtracting the time in the memory I from the maximum allowable discharge time is stored in the memory F and the memory E is set to “0 (zero)”. If it is long, a value obtained by subtracting the maximum allowable discharge time from the time in the memory I is stored in the memory E and the memory F is set to "0 (zero)".
Let it be. In any case, the travel time is calculated from the travel distance and stored in the memory A. Next, the moving time in the memory A and the permissible moving time of the XY table (4) are compared by the comparison device. If the moving time is longer, the nozzle is moved to the nozzle standby position (point B shown in FIG. (16) A stop command for stopping the movement is issued. Further, a value obtained by subtracting the table movement allowable time from the movement time is stored in the memory G. Then, the time of the memory G is compared with the time of the memory E. If the time of the memory G is longer, as shown in FIG. 9 and FIG. A value obtained by subtracting the time of the memory E from the time of the timer 8 (42)
And the time of the memory G is set to the timer 7 (41).
Set to.

When the time of the timer 8 (42) has expired, the valve 1 (19) is turned on. At the same time, the discharge time is set in the timer 10 (44). next,
When the timer 7 (41) has timed out, the nozzle (16) is lowered from the point B. And the timer 10
When the time of (44) is up, the valve 1 (19) is turned on.
FF is performed and the used memory is cleared. Note that Z shown in FIGS. 4 and 9 is the time to reach the nozzle standby position, which is the elapsed time from the point A to the point B. W shown in FIG.
This is the time required to switch the vertical motor (13). In the approximation formula, the start point of the switching time W is the time when the ejection is completed. However, the present invention is not limited to this, and any point within the time W may be used.

If the time in the memory G is smaller at the point A as a result of the comparison, the valve 1 (19) is turned on as shown in FIG. 10 and FIG. 44), and when the nozzle (16) comes to the nozzle standby position B, the time of the memory E is set in the timer 7 (41). When the time of the timer 7 (41) is up, the nozzle (16) is lowered, and when the time of the timer 10 (44) is up, the valve 1 (1) is turned off.
Turn off 9) and clear the used memory.

Next, a case where the result of comparison between the movement time in the memory A and the table movement allowable time is that the movement time is shorter will be described.

If the time in the memory E is larger than 0 at the point A, the valve 1 (19) is turned on as shown in FIGS.
0 (44), and when the nozzle (16) comes to the nozzle standby position, the time of the memory E is counted by the timer 7 (41).
Set to. When the timer 7 (41) has timed out, the nozzle (16) is lowered from the point B, and when the timer 10 (44) has timed out, the valve 1 (19)
Is turned off, and the used memory is cleared. In the case of 0, the time of the memory F is set in the timer 9 (43) as shown in FIGS.
When (43) times out, turn on valve 1 (19)
At the same time, the discharge time is set in the timer 10 (44), and when the timer 10 (44) expires, the valve 1 (19) is turned off to clear the used memory.

Thereafter, the coating operation is similarly continued.

It should be noted that a plurality of the approximate expressions may be stored in accordance with, for example, types of adhesives having different viscosities and the like, and an appropriate approximate expression may be used in accordance with the type of adhesive to be used. In addition, the approximate expression may be corrected in consideration of the remaining amount of adhesive in the syringe (17), temperature, aging, and the like.

[0043]

As described above, according to the present invention , the application nozzle is lowered.
The pressure inside the syringe rises while
To atmospheric pressure or the fall time elapses,
Variations in the discharge amount of the coating agent are prevented.

[Brief description of the drawings]

FIG. 1 is a configuration circuit diagram of a coating apparatus.

FIG. 2 is a perspective view of a coating apparatus.

FIG. 3 is a diagram showing NC data relating to a coating operation.

FIG. 4 is a timing chart of a coating operation.

FIG. 5 is a timing chart of a coating operation.

FIG. 6 is a timing chart of a coating operation.

FIG. 7 is a timing chart of a coating operation.

FIG. 8 is a timing chart of a coating operation.

FIG. 9 is a timing chart of a coating operation.

FIG. 10 is a timing chart of a coating operation.

FIG. 11 is a timing chart of a coating operation.

FIG. 12 is a timing chart of a coating operation.

FIG. 13 is a flowchart relating to a coating operation.

FIG. 14 is a flowchart relating to a coating operation.

FIG. 15 is a flowchart relating to a coating operation.

FIG. 16 is a flowchart relating to a coating operation.

FIG. 17 is a flowchart relating to a coating operation.

FIG. 18 is a flowchart relating to a coating operation.

FIG. 19 is a flowchart relating to a coating operation.

FIG. 20 is a diagram illustrating a relationship between a discharge pressure and a fall time from the discharge pressure.

FIG. 21 is a diagram showing a relationship between a coating nozzle lower limit position and a valve operation command signal.

FIG. 22 is a diagram illustrating a relationship between a coating nozzle lower limit position and a valve operation command signal.

[Explanation of symbols]

 (4) XY table (16) Application nozzle (19) Valve 1 (20) Valve 2 (28) RAM (30) CPU (35) Timer 1 (36) Timer 2 (37) Timer 3 (38) Timer 4 (39) ) Timer 5 (40) Timer 6 (41) Timer 7 (42) Timer 8 (43) Timer 9 (44) Timer 10

────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Publication No. 1-45998 (JP, B2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B05B 12/02 B05C 5/00-5 / 02 H05K 3/34 504

Claims (2)

(57) [Claims] In a coating apparatus for coating a coating agent in a syringe on a printed circuit board with a coating nozzle, discharge air supplied from an air source is supplied into the syringe to discharge the coating agent to the tip of the coating nozzle. and a valve to blow, the Bal
After the opening operation command signal is output , the pressure in the syringe becomes atmospheric pressure while the dispensing nozzle descends and stays at the lowest position.
Application nozzle so that application of application agent from cloth nozzle stops
Before the valve descends to the lowest position,
And a control device for stopping the signal . 2. A coating apparatus for applying a coating agent in a syringe on a printed circuit board with a coating nozzle, wherein discharge air supplied from an air source is supplied into the syringe to discharge the coating agent to the tip of the coating nozzle. Injecting valve and valve
Is the time from the discharge pressure to return to atmospheric pressure for opening operation instruction after stopping the discharge pressure to the coating from the coating nozzle
A storage device that stores a relational expression of the fall time in which the agent application continues , and a calculation device that calculates a fall time after stopping the opening operation command to the valve based on the relational expression stored in the storage device, While the dispensing nozzle is at the lowest position,
The opening operation command signal to the valve is stopped so that the pressure in the nozzle rises and the fall time obtained from the calculation device elapses.
And a control device for stopping the application.