JP2008161800A - Viscous agent application device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a viscous agent application device which is designed to appropriately control the application time of a viscous agent, utilizing a circuit configuration of only an air pressure circuit. <P>SOLUTION: This viscous agent application device comprises the following components: (1) a manual switching valve 11 which enables switching of an operation by hand, (2) a first pilot switching valve 13 and a second pilot switching valve arranged in an air exhaust passage 19, (3) an air timer part 14 which changes the first pilot switching valve 13 to the "open" position when pressurized air is supplied to a cylinder from an air pressure control passage and changes the first pilot switching valve 13 to the "closed" position when the pressurized air is exhausted to the air pressure control passage from the cylinder, and (4) an exhaust time adjustment part 18 which limits the amount of the pressurized exhaust air to the air pressure control passage arranged between the air timer part 14 and the air pressure control passage. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a viscous agent coating apparatus that supplies pressurized air to a syringe containing a viscous agent via a pneumatic circuit, and discharges the viscous agent from a needle attached to the tip of the syringe to apply it to a substrate or the like. .

Conventionally, there are two methods for controlling the amount of adhesive applied: a method in which the pressure when discharging the adhesive is variable, and a method in which the application time is adjusted while keeping the pressure constant. The former method has a problem that it is difficult to adjust the coating amount of the adhesive because the coating amount largely changes due to a change in pressure. On the other hand, since the latter method adjusts the coating amount according to the coating time, the coating amount of the adhesive can be adjusted appropriately. As what adjusts this application | coating time, what was described in patent document 1, for example is known.
JP 2005-197927 A (paragraph 0047, FIG. 12)

  By the way, in the case of controlling the application amount of the adhesive by adjusting the application time, a control means for controlling the application time is required. The above-mentioned Patent Document 1 does not describe anything about the specific configuration of the control means. Generally, as shown in FIG. 6 (A), an electric control circuit including a volume 1 that can adjust the discharge time. The air switching valve 3 is switched for a predetermined time based on the electrical signal (switching signal) 2. That is, when the adhesive application switch 4 is operated, a switching signal is sent to the air switching valve 3 from the electric control circuit 2 for the time T set by adjusting the volume 1, and this switching signal causes the switching signal shown in FIG. ), The switching valve 3 is switched to an open state (ON state) for a set time T. Thus, pressurized air is supplied from the air supply source 5 to the syringe 6 for a set time T, and the adhesive contained in the syringe 6 is discharged for a predetermined application time and applied to the substrate or the like.

  In the configuration shown in FIG. 6 described above, the switching time of the air switching valve 3 can be accurately controlled by an electrical signal from the electrical control circuit 2, but both the electrical control circuit 2 and the pneumatic circuit (air switching valve 3) are Since this is necessary, there is a problem that it is difficult to reduce the cost.

  The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a viscous agent coating apparatus in which the application time of the viscous agent can be appropriately controlled by the circuit configuration of only the pneumatic circuit. To do.

  In order to solve the above-described problem, the invention according to claim 1 is characterized in that pressurized air is supplied to a syringe containing a viscous agent via a pneumatic circuit and the needle is attached to the tip of the syringe. In the viscous agent coating apparatus that discharges and applies to the substrate or the like, the pneumatic circuit is disposed in an air supply passage connected to an air supply source and is switched by manual operation, and an air pressure control passage is connected to the air supply passage. And a manual switching valve for opening the air pressure control passage to the atmosphere, a first pilot switching valve disposed in an air discharge passage connected to the air supply source in parallel with the air supply passage, A second pilot switching valve disposed in the air discharge passage and switched in accordance with the pressure of the air pressure control passage; and a cylinder connected to the first pilot switching valve And when the pressurized air is supplied to the cylinder from the air pressure control passage, the first pilot switching valve is switched to the open position, and the pressurized air is discharged from the cylinder to the air pressure control passage. An air timer portion that switches the first pilot switching valve to a closed position, and a discharge time that is disposed between the air timer portion and the air pressure control passage and restricts the discharge amount of pressurized air to the air pressure control passage. And the adjustment unit.

  A feature of the invention according to claim 2 is that, in claim 1, the manual switching valve is provided with return speed control means for controlling the return speed of the manual switching valve.

  A feature of the invention according to claim 3 is the throttle valve according to claim 1 or 2, wherein the discharge time adjusting unit restricts a discharge amount of pressurized air discharged from the air timer unit to the air pressure control passage. And a check valve that is connected in parallel to the throttle valve and permits only the flow from the air pressure control passage to the air timer unit.

  According to the invention according to claim 1 configured as described above, by a pneumatic circuit including a manual switching valve, a first pilot switching valve, a second pilot switching valve, an air timer unit, and a discharge time adjusting unit, Since pressurized air is supplied to the syringe containing the viscous agent, it is possible to supply pressurized air to the syringe for a predetermined time with a simple configuration of only the pneumatic circuit, and a predetermined amount of adhesive is applied to the substrate, etc. Can be applied accurately.

  According to the invention of claim 2, since the manual switching valve is provided with the return speed control means for controlling the return speed of the manual switching valve, the first pilot switching valve can be simply switched by manual operation. After the switch is switched, the manual switching valve can be automatically returned.

  According to the invention of claim 3, the discharge time adjusting unit is connected in parallel with the throttle valve for limiting the discharge amount of the pressurized air discharged from the air timer unit to the air pressure control passage, and is connected to the throttle valve in parallel. Since it is configured with a check valve that allows only the flow from the passage to the air timer unit, the switching time of the first pilot switching valve, that is, the coating time can be freely set by limiting the discharge amount of pressurized air by the throttle valve. In addition, the check valve can quickly switch the first pilot switching valve to the open position.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a pneumatic circuit of the viscous agent applying apparatus according to the present embodiment. The pneumatic circuit is an air supply source 10, a manual switching valve 11, and a return speed for controlling the return speed of the manual switching valve 11. Control shock absorber 12, first pilot switching valve 13, air timer unit 14 connected to the first pilot switching valve 13, second pilot switching valve 15, discharge pressure adjusting unit 16, and discharge amount adjusting unit 17 And a discharge time adjusting unit 18.

  An air discharge passage 19 is connected to the air supply source 10, and the air discharge passage 19 is communicated with a syringe 21 provided in the coating head 20 shown in FIG. The syringe 21 contains a viscous agent, for example, a conductive adhesive. The adhesive is discharged in a predetermined amount according to the supply time of the pressurized air supplied to the syringe 21 and applied to the substrate or the like in a predetermined amount. It is like that. An air supply passage 23 is connected to the air supply source 10 in parallel with the air discharge passage 19.

  A manual switching valve 11 is disposed in the air supply passage 23. The first inlet port 11a of the manual switching valve 11 is always connected to the air supply source 10, and the second inlet port 11b is always connected to the exhaust. Has been. The outlet port 11 c of the manual switching valve 11 is connected to the pilot port 15 c of the second pilot switching valve 15 via the air pressure control passage 24.

  The manual switching valve 11 is normally held at the pressurized air supply position where the first inlet port 11a and the outlet port 11c communicate with each other by the urging force of the spring 25. In this state, the pressurized pressure supplied from the air supply source 10 is maintained. Air is supplied to the air pressure control passage 24 via the manual switching valve 11 and introduced into the pilot port 15 c of the second pilot switching valve 15. As a result, the second pilot switching valve 15 is held at a closed position where the communication between the inlet port 15a and the outlet port 15b is blocked against the biasing force of the normal spring 27.

  When the manual switching valve 11 is switched against the urging force of the spring 25 by manual operation, the communication between the first inlet port 11a and the outlet port 11c is cut off, and the outlet port 11c communicates with the second inlet port 11b. (Pressurized air discharge position). In this state, the air pressure control passage 24 is opened to the atmosphere, and the second pilot switching valve 15 is switched to the open position where the inlet port 15a and the outlet port 15b communicate with each other by the biasing force of the spring 27.

  The return speed control shock absorber 12 controls the return speed when the manual switching valve 11 switched by manual operation is returned by the urging force of the spring 25. By the action of the return speed control shock absorber 12, Once the manual switching valve 11 is switched, the manual switching valve 11 is not returned to the original position, that is, the pressurized air supply position, unless a predetermined time (T2) elapses.

  In the air discharge passage 19, a discharge pressure adjusting valve 16, a first pilot switching valve 13, a discharge amount adjusting unit 17, and a second pilot switching valve 15 are arranged from the upstream side. The discharge pressure adjusting valve 16 reduces the pressurized air discharged from the air supply source 10 to the air discharge passage 19 to a predetermined pressure, and the reduced pressure air is supplied to the first pilot switching valve 13. The switching time of the first pilot switching valve 13 is controlled by the air timer unit 14.

  The air timer unit 14 includes a cylinder 32 in which a piston 31 connected to the first pilot switching valve 13 is slidably fitted. A spring 33 is inserted into one chamber of the cylinder 32 defined by the piston 31. The other chamber facing the spring 33 is connected to the air pressure control passage 24, and pressurized air is supplied from the air pressure control passage 24 via the discharge time adjusting unit 18.

  The first pilot switching valve 13 is configured so that the inlet port 13a and the outlet port 13b communicate with each other against the urging force of the spring 33 when pressurized air is supplied to the other chamber of the cylinder 32 of the air timer unit 14. It has become. On the other hand, when the air pressure control passage 24 communicating with the other chamber of the cylinder 32 is opened to the atmosphere, the pressurized air is discharged from the other chamber of the cylinder 32 by the urging force of the spring 33, whereby the first pilot is discharged. The switching valve 13 is switched to a closed position where communication between the inlet port 13a and the outlet port 13b is blocked.

  The discharge amount adjusting unit 17 disposed between the first pilot switching valve 13 and the second pilot switching valve 15 is composed of a variable throttle valve, and adjusts the discharge amount of pressurized air flowing through the air discharge passage 19. It is.

  The discharge time adjusting unit 18 disposed between the air timer unit 14 and the air pressure control passage 24 includes a variable throttle valve 35 and a check valve 36 connected in parallel to each other. When the pressurized air is discharged from the other chamber of the cylinder 32 by the urging force of the spring 33, the discharge amount is limited, thereby delaying the switching of the first pilot switching valve 13 to the closed position. It comes to have. The supply of pressurized air from the air pressure control passage 24 to the cylinder 32 of the air timer unit 14 is performed via a check valve 36 that allows only the flow in the direction of the cylinder 32 from the air pressure control passage 24. The first pilot switching valve 13 is quickly switched to the open position.

  2 and 3 show a specific arrangement configuration of the above-described pneumatic circuit. As shown in FIG. 2, the main body 40 of the adhesive supply device installed on the floor has one end of a foot pedal 41. Is pivotally supported by a pivot 42, and the operating portion 43 of the manual switching valve 11 is brought into contact with the other end of the foot pedal 41 by the biasing force of the spring 25 (see FIG. 1). The manual switching valve 11 is connected to a pipe 45 constituting the air supply passage 23 and a pipe 46 constituting the air pressure control passage 24.

  The return speed control shock absorber 12 is attached to the main body 40, and the operation portion 47 of the shock absorber 12 is operatively connected to a connecting shaft 48 provided at the other end of the foot pedal 41. A spring 49 is provided between the connecting shaft 48 and the main body 40, and the restoring force by the shock absorber 12 is adjusted by the biasing force of the spring 49.

  As a result, when the foot pedal 41 is operated by a manual operation (stepping operation) by the operator, the operation portion 43 of the manual switching valve 11 is acted against the urging force of the spring 25 and the return speed control shock. The operating portion 47 of the absorber 12 is operated, and the return speed of the operating portion 43 of the manual switching valve 11 due to the urging force of the spring 25 is delayed by the shock absorber 12.

  Also, as shown in FIG. 3, a syringe 21 containing an adhesive is attached to the application head 20 of the application robot that can move in a three-dimensional direction, and a needle 22 that discharges the adhesive to the tip of the syringe 21 is provided. It is detachably attached. The frame 51 of the coating head 20 is provided with the first pilot switching valve 13, the second pilot switching valve 15, the air timer valve 14, the discharge pressure adjusting valve 16, the discharge amount adjusting valve 17, and the discharge time adjusting valve 18, respectively. The discharge pressure adjusting valve 16 is connected to an air supply source 10 (see FIG. 1) via a supply hose (not shown), and the second pilot switching valve 15 is connected to a syringe 21 via a supply hose 55. Has been.

  Next, the operation of the viscous agent coating apparatus having the above-described configuration will be described with reference to the time chart of FIG. Normally, as shown in FIG. 1, the manual switching valve 11 is held at a pressurized air supply position where the first inlet port 11 a and the outlet port 11 c communicate with each other by the biasing force of the spring 25. The pressurized air supplied to the air supply passage 23 is supplied to the air pressure control passage 24 via the manual switching valve 11 and introduced into the pilot port 15 c of the second pilot switching valve 15. Thus, the second pilot switching valve 15 is switched to the closed position where the communication between the inlet port 15 a and the outlet port 15 b is blocked against the biasing force of the spring 27, and the air discharge passage 19 is blocked. Therefore, the supply of the pressurized air discharged from the air supply source 10 to the air discharge passage 19 is stopped by the second pilot switching valve 15 to the syringe 21 side.

  In this state, since the pressurized air supplied to the air pressure control passage 24 is supplied to the other chamber of the cylinder 32 of the air timer unit 14 via the check valve 36 of the discharge time adjusting unit 18, The piston 31 connected to the 1 pilot switching valve 13 is slid against the urging force of the spring 33, whereby the first pilot switching valve 13 is switched to the open position that connects the inlet port 13a and the outlet port 13b. It is done.

  In this state, when the foot pedal 41 is operated and the manual switching valve 11 is switched against the biasing force of the spring 25, the first inlet port 11a is closed and the outlet port 11c is exhausted as shown in FIG. Is connected to the second inlet port 11b connected to. As a result, the air pressure control passage 24 is opened to the atmosphere, and the second pilot switching valve 15 is switched to the open position where the inlet port 15a and the outlet port 15b communicate with each other by the biasing force of the spring 27. As a result, the pressurized air supplied from the air supply source 10 to the air discharge passage 19 is supplied to the syringe 21 via the first pilot switching valve 13 and the second pilot switching valve 15.

  When the operator removes his / her foot from the foot pedal 41, the manual switching valve 11 does not return to the original position (pressurized air supply position) by the urging force of the spring 25, but the return operation is a return speed control shock. Since it is limited by the absorber 12, as shown in FIG. 4, it takes a predetermined time T2 until the manual switching valve 11 returns to the original position. Until then, the air pressure control passage 24 is opened to the atmosphere. Will continue.

  By the way, when the air pressure control passage 24 is opened to the atmosphere, pressurized air is supplied from the other chamber of the cylinder 32 of the air timer unit 14 via the variable throttle valve 35 of the discharge time adjusting unit 18. However, since the discharge of the pressurized air is restricted by the variable throttle valve 35 of the discharge time adjusting unit 18, the first pilot switching valve 13 is as shown in the time chart of FIG. If the set time T1 does not elapse after the manual switching valve 11 is switched by manual operation, it cannot be switched to the closed position. The set time T1 can be arbitrarily set by adjusting the throttle area of the variable throttle valve 35 of the discharge time adjusting unit 18.

  Accordingly, the pressurized air is supplied to the syringe 21 for the time T1 set by the discharge time adjusting unit 18, and when the set time T1 has elapsed, the first pilot switching valve 13 is switched to the closed position, whereby the air discharge Since the passage 19 is blocked, the supply of pressurized air to the syringe 21 is stopped.

  In this way, both the first pilot switching valve 13 and the second pilot switching valve 15 are kept open as shown in FIG. 5 only for the set time T1 after the manual switching valve 11 is switched by manual operation. Therefore, the pressurized air is supplied to the syringe 21 for a predetermined time T1, and the adhesive is discharged from the syringe 21. Therefore, a predetermined amount of adhesive can be accurately applied to the substrate or the like. In addition, this can be achieved by a simple configuration of only a pneumatic circuit without using a conventional electric control circuit.

  Then, when a predetermined time T2 (T2> T1) elapses after the manual switching valve 11 is switched, the manual switching valve 11 is returned to the original position (pressurized air supply position) as shown in FIG. Pressurized air is supplied again to the air pressure control passage 24 via the manual switching valve 11, and the second pilot switching valve 15 is switched to the closed position by this pressurized air and the check valve 36 of the discharge time adjusting unit 18. The pressurized air is supplied to the cylinder 32 of the air timer unit 14 through the first, and the first pilot switching valve 13 is switched to the open position.

  In the above-described embodiment, the manual switching valve 11 is returned to the original position by the return speed control shock absorber 12 after the first pilot switching valve 13 is switched to the closed position. The shock absorber 12 is not always a necessary requirement, and the manual switching valve 11 can be manually returned to the original position after the first pilot switching valve 13 is switched to the closed position. Further, the means for returning and controlling the manual switching valve 11 is not limited to the shock absorber 12, and another means can be used.

  In the above-described embodiment, the example in which the adhesive is applied has been described. However, the present invention is not limited to the adhesive, but can be applied to the application of a viscosity agent other than the adhesive, for example, a sealing agent. It is.

  Thus, the specific configuration described in the above embodiment is merely an example of the present invention, and the present invention is not limited to such a specific configuration. Of course, various embodiments can be employed without departing from the scope.

It is a pneumatic circuit diagram of a viscous agent application device showing an embodiment of the present invention. It is a figure which shows the operation part of the manual switching valve which comprises a pneumatic circuit. It is a figure which shows the arrangement structure of each valve | bulb which comprises a pneumatic circuit. It is a time chart which shows the switching state of a valve. It is a figure which shows the operation state of FIG. It is a figure which shows the control circuit of the conventional viscous agent coating device.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 10 ... Air supply source, 11 ... Manual switching valve, 12 ... Shock absorber for return speed control, 13 ... 1st pilot switching valve, 14 ... Air timer part, 15 ... 2nd Pilot switching valve, 16 ... discharge pressure adjusting valve, 17 ... discharge amount adjusting unit, 18 ... discharge time adjusting unit, 19 ... air discharge passage, 21 ... syringe, 22 ... needle , 23 ... Air supply passage, 24 ... Air pressure control passage, 32 ... Cylinder, 35 ... Variable throttle valve, 36 ... Check valve, 41 ... Foot pedal.

Claims (3)

In a viscous agent coating apparatus that supplies pressurized air to a syringe containing a viscous agent via a pneumatic circuit, and discharges the viscous agent from a needle attached to the tip of the syringe and applies it to a substrate or the like.
The pneumatic circuit is
A manual switching valve disposed in an air supply passage connected to an air supply source and switched by manual operation, connecting an air pressure control passage to the air supply passage and opening the air pressure control passage to the atmosphere;
A first pilot switching valve disposed in an air discharge passage connected in parallel to the air supply passage to the air supply source;
A second pilot switching valve disposed in the air discharge passage and switched according to the pressure of the air pressure control passage;
A cylinder connected to the first pilot switching valve is provided, and when the pressurized air is supplied to the cylinder from the air pressure control passage, the first pilot switching valve is switched to an open position, and the air pressure control is performed from the cylinder. An air timer unit that switches the first pilot switching valve to a closed position when pressurized air is discharged into the passage;
A discharge time adjusting unit that is disposed between the air timer unit and the air pressure control passage and limits a discharge amount of the pressurized air to the air pressure control passage;
A viscosifying agent applicator characterized by comprising:   The viscous agent applicator according to claim 1, wherein the manual switching valve includes a return speed control unit that controls a return speed of the manual switching valve.   3. The discharge time adjusting unit according to claim 1, wherein the discharge time adjusting unit is connected in parallel to a throttle valve for limiting a discharge amount of pressurized air discharged from the air timer unit to the air pressure control passage. And a check valve that allows only the flow from the air pressure control passage to the air timer unit.

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