TWI426973B - Droplet discharge device and method - Google Patents

Description

Droplet discharge device and method

The present invention relates to a droplet discharge device and method for scattering and discharging a liquid material in a liquid droplet state.

In the present specification, the term "liquid material" means a liquid material, and all of them have fluidity, and for example, a liquid material having a granular fine substance generally referred to as a filler is of course covered.

In addition, the "liquid droplet state" refers to a state in which the liquid material discharged from the discharge port moves in the space without contacting the discharge port and the object to be coated.

A conventional droplet discharge device that ejects a liquid material onto a workpiece after it leaves the nozzle, such as a flow path in which a valve seat is provided near an outlet to which the nozzle is connected, and the side surface of the plunger rod is non-contacted. By moving the tip end of the plunger rod toward the valve seat and abutting against the valve seat, the liquid material is discharged from the nozzle in a liquid droplet state (Patent Document 1).

Further, in the case where the plunger that is rapidly advanced is not in contact with the valve seat, the technique of slamming the liquid material to drip and drip, as proposed by the applicant, discharges the liquid material in which the front end surface is in close contact with the liquid material. The method and apparatus for discharging the liquid material by applying the inertial force to the liquid material and discharging the liquid material by the plunger driving means at high speed (Patent Documents 2 and 3).

Patent Document 1: Japanese Patent Laid-Open Publication No. Hei No. Hei. No. Hei. No. 2005-190700.

In the conventional liquid droplet discharge device disclosed in Patent Document 1 in which the front end of the plunger rod that is moved at a high speed is pressed against the valve seat and is discharged, if the plunger rod is repeatedly brought into contact with the valve seat, the plunger rod and the valve seat will be worn. Produces a friction powder and a wearer. When the frictional powder or the wearing sheet produced in this manner is mixed into the liquid material, not only the liquid material but also the liquid material is sandwiched between the plunger rod and the valve seat, which causes a good discharge.

Furthermore, since the wear of the plunger rod or the valve seat will change the shape of the plunger rod and the valve seat itself, the discharge before and after the wear will not be reproducible, and the plunger rod and the valve seat must be periodically replaced.

Furthermore, when a liquid material containing fine particles called a filler is discharged, the filler will be caught between the plunger rod and the valve seat to collapse, and the property of the liquid material will be changed due to the collapsed filler. The problem. In addition, the collapsed and deformed filler also has a problem that it will become a cause of nozzle blockage.

Furthermore, if the filler is sandwiched between the plunger rod and the valve seat, the contact state between the plunger rod and the valve seat will change each time the discharge is performed, and not only the discharge will not be reproducible, but also The discharge of the liquid material without leaving the nozzle, or the situation in which the liquid material is scattered, causes the liquid material to adhere to an unintended position on the workpiece to contaminate the workpiece.

In recent years, the demand for discharging solder paste containing solder particles in the state of droplets is increasing, and in order to discharge the liquid material doped with the filler in a liquid droplet state, the above-mentioned problem is more important.

The methods and devices described in Patent Documents 2 and 3 are all aimed at the purpose The plunger advances while sliding on the side surface of the liquid chamber, and the liquid material is metered and discharged. That is, since the plunger advances while sliding on the side surface of the liquid chamber, the liquid material corresponding to the moving amount is discharged with high precision. However, conversely, when the plunger advances, since the side surface of the plunger is in contact with the inner wall of the liquid chamber, there is a limit to the high-speed movement of the plunger due to the sliding resistance.

An object of the present invention is to provide a droplet discharge technique in which a tip end of a plunger is held in a non-contact state on a wall of a liquid chamber during a discharge operation, and in particular, it is an object of the invention to provide a liquid material in which a filler such as a solder paste or the like is incorporated. A droplet discharge device and method that can perform a good discharge can still be performed.

The liquid droplet discharge device according to the first aspect of the invention includes a liquid chamber having a discharge port for discharging the liquid material, a through hole that communicates with the liquid chamber, and is inserted into the through hole, and the tip end portion is in the liquid chamber. a plunger that moves forward and backward; a plunger moving mechanism that causes the plunger to move forward and backward; and a plunger positioning mechanism that regulates the position of the front end of the plunger; and, by making the front end portion of the plunger non-contact with the inner wall of the liquid chamber a liquid droplet discharging device that performs an inflow and out movement of the plunger and a stop of the inflow and out to give an inertial force to the liquid material and is discharged in a liquid droplet state; wherein the plunger positioning mechanism is to position the front end portion of the plunger when the inlet and the stop are stopped, Near the inner wall of the liquid in its direction of entry and exit.

Since the liquid material can be discharged in a liquid droplet state without the front end of the plunger abutting against the inner wall of the liquid chamber (corresponding to a conventional valve seat), the wear of the plunger and the valve seat can be prevented from occurring. The occurrence of powder and wear sheets occurs, and deformation of the shape due to abrasion of the plunger and the valve seat is prevented. A conventional problem that lacks reproducibility can be solved. In addition, the filler does not get caught between the plunger rod and the valve seat to cause a collapse.

Further, since the front end portion of the plunger and the inner wall of the liquid chamber are discharged in a non-contact state, since the sliding resistance is not generated in the side surface of the plunger and the liquid chamber, the plunger can be moved at a high speed.

The second means for solving the first means is that the front end of the plunger at the time of the stop-and-go is located in the vicinity of the liquid chamber wall and the discharge port in the direction in which the inlet and the exit are stopped.

By placing the front end of the plunger in the vicinity of the liquid chamber wall and the discharge port in the direction in which it is inserted, the inertial force of the liquid material can be made to function under better conditions. That is, when the inlet and the end are stopped, the tip end of the plunger is located near the discharge port, and the flow resistance of the liquid material moving in the direction of the discharge port due to the plunger operation is reduced, and the liquid droplet state is likely to occur. The liquid chamber not only forms a mortar shape as shown in Fig. 2, but also forms a cylindrical shape as shown in Fig. 8.

According to a third aspect of the invention, in the first or second aspect, the inner wall of the front end portion of the liquid chamber is formed in a conical shape having a discharge port at the foremost end.

According to a fourth aspect of the invention, in the first or second aspect, the inner wall of the front end portion of the liquid chamber constitutes a flat surface on which the discharge port is provided.

The fifth aspect of the invention, wherein the plunger positioning mechanism is provided with a front abutting portion (43) provided on the plunger and abutting against the front side The portion (43) is a forward stop (51); and the front abutment portion (43) abuts against the front stop (51) to determine the stop position when the plunger enters and exits.

By setting the front stop, the plunger in and out of the movement can be independent of speed. The ground can be stopped at the same predetermined position, and an appropriate inertial force can be applied to the liquid material, and the liquid material can be discharged well in a liquid droplet state. Further, since the plungers are properly stopped at the predetermined same position, the inertial forces imparted to the liquid material at each discharge can be made equal, and the discharge can be performed with higher reproducibility.

According to a sixth aspect of the invention, in the fifth aspect, the plunger positioning mechanism is provided with a moving member (30) capable of advancing and retracting the position, and the moving member (30) advances and retreats the position of the front stop. The stop position when the plunger is moved in and out can be adjusted.

By moving the position of the front stop before the discharge, the stop position at the time of the plunger rod entering and leaving can be changed. Therefore, the optimum column can be set in accordance with the content of the filler contained in the liquid material and the size of the filler. The plug stop position, in addition, even if the liquid material and other discharge conditions change, the condition can be adjusted to adjust the plunger to stop at the optimum position, so that good discharge can be often achieved.

According to a seventh aspect of the invention, in the sixth aspect, the moving member (30) is provided with a position display member that displays the position.

The position display member of the moving member can quantitatively adjust the stop position when the plunger enters and exits.

By accurately adjusting the distance between the front end of the plunger and the contact position with respect to the stop position when the plunger rod is moved in and out, it is possible to perform discharge with excellent reproducibility and high precision.

The eighth means for solving the sixth or seventh means includes: providing the through hole (24) through which the plunger is inserted and the piston chamber (61) And a discharge block having a discharge port, a liquid chamber, a liquid supply port, and a through hole (26) through which the plunger is inserted; the plunger is provided with: a plunger rod and a width wider than the plunger a rod is disposed in a front abutting portion (43) of the piston chamber (61); the moving member (30) is provided with a through hole (34) through which the plunger is inserted, and is disposed on the body and the discharge block Between the body.

The ninth aspect of the invention, wherein the front stop (51) is a piston chamber that faces the one side of the front abutting portion (43) in the direction of entry and exit. One of (61).

The ninth solution is the solution of any one of items 6 to 9, wherein the front side of the moving member (30) is advanced and retracted to adjust the distance between the body and the discharge block, thereby adjusting the front The position of the stop.

According to a tenth aspect of the invention, in the tenth aspect of the invention, the system includes a base member that is mounted in a state in which the position can be advanced and retracted, and the discharge block is fixed and mounted.

According to any one of the sixth to eighth aspect, the front stop (51) is formed by a rear end portion of the moving member (30) protruding in the piston chamber (61), The position of the front stop (51) can be adjusted by advancing and retracting the position of the moving member (30).

The ninth solution is the solution of any one of the items 6 to 12, wherein the position of the moving member (30) is advanced and retracted, and the position of the plunger is adjusted to the position of the front end of the plunger. Contact position of the inner wall of the liquid (12).

When determining the stop position when the plunger enters and exits, it is preferable to push the plunger in and out because the front end can be appropriately set to the contact position and retracted therefrom. Adjust to the contact position where the front end of the plunger contacts the inner wall of the liquid chamber.

According to a thirteenth aspect, in the thirteenth aspect, the plunger front end is configured to block the discharge port at the contact position (12).

The ninth aspect of the invention, wherein the plunger is provided with a rear abutting portion (45) on a retreating direction side of the front abutting portion (43), the plunger The positioning mechanism includes a rear stopper (52) that abuts against the rear abutting portion (45) to restrict the backward movement of the plunger, and a rear stopper moving mechanism that moves the rear stopper (52) in and out.

The solution according to any one of the first to fifteenth aspect, wherein the means for providing the elastic force to the plunger in the direction of the entry and exit is provided.

The solution of any one of items 1 to 16, wherein the liquid chamber is provided with a liquid material supply port for supplying the liquid material; and the liquid crystal supply port is provided with a forward and backward movement interlocking with the plunger, and A liquid supply control device for supplying the liquid material to the liquid material supply port.

The solution according to any one of the items 1 to 17, wherein the means for applying a pressurization and decompression to the liquid material in the liquid chamber is provided in conjunction with the forward and backward movement of the plunger mechanism.

The ninth solution is a method for discharging the liquid droplets, wherein the front end portion of the plunger and the inner wall of the liquid chamber are moved in and out of the plunger in a non-contact state, and the inertia force is applied to the liquid material and flies out according to the liquid droplet state. Further, the discharged liquid droplet discharging method includes: a liquid chamber having a discharge port; and a plunger whose front end portion is moved forward and backward in the liquid chamber; and the plunger front end is located in the liquid chamber in the direction in which it enters and exits when the inlet end is stopped. Near the wall.

The 20th solution is the 19th solution to make the plunger front end When the entry and exit is stopped, it is located near the liquid chamber wall and the discharge port in the direction in which it enters and exits.

According to a twenty-ninth or twenty-second aspect, the plunger is provided with a front abutting portion (43) and is provided with a front stopper (51) facing the front abutting portion (43). By abutting the front abutting portion (43) against the front stopper (51), the stop position at the time of plunger entry and exit is determined.

The 22nd solution is a moving member (30) capable of advancing and retracting the position in the 21st solution; and the position of the front stop (51) is advanced and retracted by the moving member (30), thereby adjusting the column Stop position when plugging in and out.

According to a twenty-second aspect, in the twenty-second aspect, the moving member (30) is provided with a position display member for displaying a position thereof, and the position of the moving member (30) is adjusted according to a display value of the position display member.

According to a twenty-second aspect, in the solution of the 22nd or 23rd aspect, the piston is formed to face the one side of the front abutting portion (43) in the direction of the entry and exit direction, and is provided with a piston which constitutes the front stopper (51). The chamber (61) adjusts the position of the piston chamber (61) by advancing and retracting the position of the moving member (30) to adjust the position of the front stopper (51).

According to a twenty-second aspect, in the means for solving the 22nd or 23rd aspect, the moving member (30) has a rear end portion which is formed to face the front side of the front abutting portion (43) The position of the front stop (51) is adjusted by advancing and retracting the position of the moving member (30).

The 26th solution is for the solution of any one of the items 22 to 25, the adjustment of the stop position when the plunger enters and exits is carried out by the following steps: The position of the tip end of the plunger is regarded as a contact position (12) contacting the inner wall of the liquid chamber, and the first step of bringing the front abutting portion (43) into contact with the front stopper (51); and maintaining the front abutment When the portion (43) is in contact with the front stopper (51), the moving member (30) is advanced and retracted by the required distance, and the position of the distal end of the plunger is set to the required distance from the contact position (12). 2 steps.

According to a twenty-seventh aspect, the plunger front end plunger front end is configured to block the discharge port at a contact position (12) contacting the liquid chamber wall, and in the first step Whether or not the position of the front end of the plunger is located at the contact position (12) is determined by whether or not the liquid material flows out from the discharge port.

If the front end of the plunger constitutes a state in which the discharge port is blocked at the contact position, when the front end is at the contact position, the liquid material is not leaked from the discharge port, but if the plunger moves backward, the front end and the discharge port appear between the front end and the discharge port. In the gap, the liquid material is leaked from the discharge port, so that the leakage of the liquid material can be used to determine whether the front end of the plunger is at the contact position.

The ninth aspect of the present invention, wherein the plunger is provided with a rear abutting portion (45) on the side of the front abutting portion (43) in the backward direction, and is opposite to the rear side. The abutting portion (45) is provided with a rear stopper (52) that can advance and retreat its position, and the rear abutting portion (45) abuts against the rear stopper (52) to restrict the backward movement of the plunger.

Item 29 is the solution according to any one of the items 19 to 28, wherein the liquid chamber is provided with a liquid material supply port for supplying the liquid material, and the liquid material supply is linked to the forward and backward movement of the plunger. Supply liquid material.

The 30th solution is to solve the problem in any of items 19 to 29. In the paragraph, the liquid material is a liquid material in which a filler is incorporated.

The solution according to any one of the items 19 to 30, wherein the liquid material in the liquid chamber is pressurized and depressurized in conjunction with the forward and backward movement of the plunger.

According to the present invention, it is possible to provide a droplet discharge technique in which the tip end portion of the plunger can be discharged in the case of a non-contact liquid chamber inner wall, and it is possible to perform a liquid material which is filled with a filler such as a solder paste. discharge.

A liquid droplet discharging device for carrying out the apparatus of the preferred embodiment of the present invention includes: a liquid chamber having a discharge port for discharging the liquid material; a through hole communicating with the liquid chamber; and being inserted into the through hole and having the tip end portion in the liquid chamber a plunger that performs a forward and backward movement; a plunger moving mechanism that causes the plunger to move forward and backward; and a plunger positioning mechanism that regulates a position of the front end of the plunger; and, by making the front end portion of the plunger non-contact with the inner wall of the liquid chamber a state in which the plunger moves in and out and stops in order to apply an inertial force to the liquid material to discharge the droplet discharge device in a liquid droplet state; wherein the plunger positioning mechanism is to position the plunger front end portion when the inlet and the exit are stopped. It is regulated near the inner wall of the liquid in its direction of entry and exit (preferably in the vicinity of the inner wall and the discharge port in the direction of entry and exit). The plunger positioning mechanism is provided with a front abutting portion provided on the plunger and a front stopper that faces the front abutting portion, and the front abutting portion abuts against the front stopper. Determine the stop position when the plunger enters and exits. In addition, the "plunger positioning mechanism" means a mechanism that determines a stop position when the plunger enters and exits and/or a stop position when the plunger is retracted.

Preferably, the apparatus of the present invention adjusts the stop position when the plunger is moved in and out to an optimum position so that good discharge can be performed. Here, in order to make this adjustment, the concept of being in a standard state is created, and the optimal position adjustment can be realized by adjusting the stop position of the plunger in and out based on the standard state. Here, the "standard state" means that the tip end position of the plunger is in contact with the inner wall of the liquid chamber, and the front abutting portion is in contact with the front stopper.

By using the standard state as a reference, the stop position when the plunger is moved in and out can be adjusted to an optimum state. However, since it is difficult to externally check the internal position of the plunger from the outside, it is necessary to set the internal position. Master the components used in the specification state. Specifically, what kind of components are set up is a design matter, but it is probably determined according to the following three methods: First, when the front abutting portion is in contact with the front stopper, the state in which the front abutting portion and the front stopper are separated is restricted according to physical properties, and the front abutting portion and the front stopper are advanced to be in a standard state. From here, the stop position at which the plunger is moved in and out is adjusted by the distance between the front abutting portion and the front stopper, and then the restriction of the forward abutment portion and the front stop is released. The first embodiment described later is based on this method.

Secondly, after the plunger is advanced and the front end position is at the contact position, the state in which the plunger moves backward is restricted according to physical characteristics, the front stop is retracted and is in a normal state, and then, after the restriction of the plunger retreating movement is released, , then let the front stop the distance required to advance and retreat. Embodiment 4 to be described later is based on this method.

Third, the plunger will use the elastic body to give the elastic force in the direction of entry and exit. When the front end thereof is in contact with the inner wall of the liquid chamber, when the discharge port is blocked, the plunger is advanced and the front end position is set by moving the front end to the position where the unrestricted plunger enters and exits. In order to contact the position, the front stop is retracted until the liquid material flows out of the discharge port, and then the specification is made, and then the front abutment portion and the front stop are moved forward and backward to adjust the distance between the plunger and the plunger. The way to stop the position. The seventh embodiment described later is based on this method.

The details of the present invention are described below by way of examples, but the present invention is not limited by the following examples.

[Example 1] "structure"

Fig. 1 is an overall external view of the liquid droplet discharging device of the present embodiment, and Fig. 2 is a cross-sectional view showing the front stop position adjusting mechanism of the main body 71, the discharge block 81, and the moving member 30 shown in Fig. 1. In the following description, for the convenience of explanation, the side of the nozzle 11 is referred to as "front", and the side of the micrometer 69 is referred to as "rear".

The main constituent elements of the apparatus are the drive unit 70 provided on the base member 27, the discharge unit 80, and the moving member 30 provided between the units.

[1] The description will be given of the drive unit 70.

The drive unit 70 has a body 71 and a plunger 40 that moves while sliding in the body 71.

The plunger 40 is provided on the front side thereof with a plunger rod 41 having a hemispherical shape at the tip end and an elongated cylindrical rod shape. The rear side of the plunger rod 41 will be cylindrical and straight The diameter is larger than the joint portion 42 of the plunger rod 41. A cylindrical front abutting portion 43 having a larger diameter than the connecting portion 42 is formed on the rear side of the connecting portion 42. A cylindrical piston 44 having a diameter larger than the front abutting portion 43 and having the same diameter as the piston chamber 61 is formed on the rear side of the front abutting portion 43. The rear side of the piston 44 constitutes a cylindrical rod-shaped rear abutting portion 45.

Both the front abutting portion 43 and the rear abutting portion 45 have a function of determining the position of the front end 13 of the plunger rod 41. The plunger rod 41, the coupling portion 42, the front abutting portion 43, the piston 44, and the rear abutting portion 45 are disposed coaxially.

In addition, the configuration of the plunger 40 is not limited to this embodiment, and its shape and the like are design matters. For example, a plunger having a shape formed by only the plunger rod 41 and the piston 44 of the present embodiment can be used for the same purpose.

The main body 71 is provided with a sliding recess 23, a through hole 24, a piston chamber 61, and a spring chamber 64 in terms of its internal space. The space systems are each coaxially arranged.

The sliding recess 23 is a cylindrical space that is connected to the through hole 24 from the front end side of the main body 71. The inner diameter of the sliding recess 23 will be larger than the through hole 24. The inner diameter of the sliding recess 23 is formed by fitting the rear convex portion 33 of the moving member 30 inserted therein.

The through hole 24 is a cylindrical space having a smaller diameter than the sliding concave portion 23 to which the front side is connected. The connecting portion 42 inserted into the through hole 24 has an outer diameter equal to the inner diameter of the through hole 24. Therefore, when the plunger 40 is moved forward and backward, the plunger rod 41 does not move toward the lateral vibration. Here, in the groove provided in the inner wall of the through hole 24, the annular seal 18B is fitted, and the plunger 40 is configured to be moved back and forth in accordance with the state in which the seal 18B and the joint portion 42 are in close contact with each other. The freely constructed structure is such that the air in the piston chamber 61 does not leak to the front.

The piston chamber 61 is a cylindrical space having a larger diameter than the through hole 24 connected to the front side, and is divided into a front piston chamber 62 and a rear piston chamber 63 by the inserted piston 44. Here, in the groove provided in the circumferential surface of the piston 44, the annular seal 18A is fitted, and the plunger 40 is configured to move back and forth in a state in which the seal 18A is in close contact with the inner wall of the piston chamber 61, and thus the front piston The air in the chamber 62 and the rear piston chamber 63 does not leak over the seal 18A and toward the opposite side.

The front wall of the front piston chamber 62 abuts against the front abutting portion 43, and constitutes a front stopper 51 that restricts the forward movement of the plunger 40.

A front air flow path 48 that communicates the front piston chamber 62 with the outside is provided on the side surface of the front piston chamber 62.

The spring chamber 64 has a cylindrical shape with a smaller diameter than the piston chamber 61 connected to the front side. The coil spring 66 is disposed in the spring chamber 64 so as to be pressed toward the direction in which the rear end portion of the piston 44 and the rear end surface of the piston 44 are separated from each other. That is, the plunger 40 will be pushed forward by the coil spring 66. In the ring of the coil spring 66, the rear stopper 52 and the rear abutment portion 45 are opposed to each other. One end portion of the rear stopper 52 is connected to a micrometer 69 disposed outside the rear end of the body 71. The micrometer 69 is a rear stop moving mechanism that moves the rear stopper 52 toward the front and rear by rotating it. The micrometer 69 is rotatably fixed by a rotary lock member (not shown) so that the position of the rear stopper 52 can be fixed. A rear air flow path 49 that communicates with the outside is provided on the side surface of the spring chamber 64.

An electromagnetic switching valve 72 is fixed to the outer wall of the body 71. Electromagnetic switching One end of the valve 72 will be in communication with the forward air flow path 48 and the other end will be in communication with the air supply source 73. By the electromagnetic switching valve 72, the communication state between the front piston chamber 62 and the air supply source 73 or the outside can be switched.

The outer wall of the main body 71 is provided with two long holes 53A and 53B penetrating the back surface from the front surface. The main body 71 is fixed by fixing screws 54A and 54B that pass through the long holes 53A and 53B and are screwed into the screw holes of the base member 27. When the fixing screws 54A, 54B are loosened, the body 71 can move the base member 27 back and forth. If the fixing screws 54A, 54B are locked, the body 71 is fixed and the base member 27 cannot be moved. .

[2] Description of the discharge unit 80.

The discharge unit 80 is provided with a rectangular parallelepiped discharge block 81 and a nozzle 11. The discharge block 81 will be fixed to the base member 27.

The discharge block 81 is provided with a front recess 21 provided on the front end surface, a rear recess 22 provided on the rear end surface, a through hole 26 connecting the same, and a liquid supply flow communicating with the front recess 21. Road 17. The front recessed portion 21, the rear recessed portion 22 provided at the rear end surface, and the through hole 26 are coaxially disposed.

The front recessed portion 21 and the rear recessed portion 22 have a cylindrical shape, and a screw groove is provided on the inner peripheral side surface.

In the front recessed portion 21, a nozzle 11 provided with a discharge port 10 is screwed at the front end thereof. That is, the screw groove provided on the outer circumferential surface behind the nozzle 11 is screwed into the screw groove of the front recess 21, and the nozzle 11 is fixed to the discharge block 81. Since the nozzles 11 are fixed by screws, they can be easily replaced and can be used in different shapes and sizes for use.

The nozzle 11 of the present embodiment has a mortar shape inside, and the liquid chamber 14 is constituted by a space surrounded by the inner wall of the nozzle 11 and the inner wall of the front recess 21.

The inner diameter of the through hole 26 is formed to be slightly larger than the outer diameter of the plunger rod 41. Therefore, when the operation is performed, the outer diameter of the plunger rod 41 and the inner wall of the through hole 26 are not in contact with each other. In the groove provided in the inner peripheral surface of the through hole 26, the annular seal 18C is fitted, and the plunger 40 is configured to be movable forward and backward while the seal 18C is held in close contact with the plunger rod 41. Therefore, the liquid material in the liquid chamber 14 will not exceed the seal 18C and leak toward the rear.

The liquid material supply flow path 17 is formed such that one end thereof constitutes a liquid material supply port 16 provided on the inner circumferential surface of the front concave portion 21, and the other end thereof communicates with the liquid supply pipe 6 connected to the outer side surface of the discharge block body 81.

[3] Description of the moving member 30.

The moving member 30 is composed of a cylindrical front convex portion 31, a disk-shaped rotary knob 32, and a cylindrical rear convex portion 33, and is disposed between the drive unit 70 and the discharge unit 80. The front convex portion 31, the rotary knob 32, and the rear convex portion 33 are arranged equiaxed, and the through holes 34 are provided in the central axes. The inner diameter of the through hole 34 is set to a size that does not contact the side surface of the plunger rod 41 when the plunger rod 41 is inserted.

The front convex portion 31 has a columnar shape, and the outer peripheral surface is provided with a screw groove for screwing into the rear concave portion 22 of the discharge unit 80.

The surface of the rotary knob 32 is a memory corresponding to the position display member (movement amount checking member), and a state in which the rotation angle is known from the outside is formed (see FIG. 1). The positional change of the moving member 30 generated by the rotary knob 32 can be quantitatively known.

The outer diameter of the rear convex portion 33 is equal to the inner diameter of the sliding concave portion 23 of the drive unit 70, and will be inserted into the sliding concave portion 23.

The moving member 30, the driving unit 70, and the discharge unit 80 are disposed so as to penetrate the through hole 24, the through hole 34, and the through hole 26, and to bring the tip end 13 of the plunger rod 41 into the liquid chamber 14.

The discharge port 10 of the nozzle 11 is disposed coaxially with respect to the plunger rod 41 inserted into the liquid chamber 14. When the plunger rod 41 moves forward, the front end 13 of the plunger rod 41 comes into contact with the inner wall of the liquid chamber 14 in such a manner as to block the discharge port 10. This position is referred to as "contact position 12". In the conventional device, it corresponds to the seating position with the valve seat, however, the device of the present embodiment does not have a valve seat.

[4] Other constituent elements

In addition to the above constituent elements, the apparatus of the present embodiment further includes a setting unit 1, a control unit 2, a pneumatic dispenser 3, and a liquid material storage container 5.

The liquid material storage container 5 for storing the liquid material for discharging the inside of the liquid droplets is connected to the liquid supply tube 6 at the lower end thereof. Here, the liquid material in the present embodiment is a solder paste containing solder particles. The upper end of the liquid material storage container 5 is connected to the air tube 4 and communicates with the air supply port of the pneumatic batching machine 3.

The pneumatic batching machine 3 supplies the air having the set pressure for a set period of time, and is connected to the control unit 2. The control unit 2 is connected to the setting unit 1 for performing a setting change or the like by the user, and is also connected to the electromagnetic switching valve 72.

In addition to the above configuration, when the liquid material is more susceptible to temperature, it may be in the air tube 4, the liquid material storage container 5, the liquid chamber 14, and the liquid material supply flow path. At a desired place such as 17th, a well-known temperature control device for controlling the temperature is provided.

"action"

The operation of the apparatus of this embodiment will be described.

[5] Setting of stop position of plunger 40

Description will be made with reference to Fig. 3(a). First, the electromagnetic switching valve 72 is switched so that the front piston chamber 62 communicates with the outside, and the rotary knob 32 is rotated to move the moving member 30 to the foremost state.

Since the front piston chamber 62 is opened to the outside, the piston 44 is moved forward relative to the main body 71 by the action of the coil spring 66, and then the front abutting portion 43 abuts against the front stopper 51 and stops. Next, the micrometer 69 is rotated to advance the rear stopper 52, and the plunger 40 is fixed to the main body 71 by coming into contact with the rear abutment portion 45. Then, in order to prevent the micrometer 69 from rotating, it is convenient to fix it by a rotary lock member such as a fixing screw (not shown).

Further, when the coil spring 66 has sufficient elastic force, there is a possibility that the front abutting portion 43 and the front stopper 51 are brought into contact with each other even if the micrometer 69 is not fixed. In addition, a fixing member other than the micrometer 69 may be provided, and the front end abutting portion 43 may be in a state in which the piston 44 cannot move rearward in a state in which the front abutting portion 43 abuts against the front stopper 12.

When the fixing screws 54A, 54B are loosened, the main body 71 is moved forward and backward relative to the base member 27, so that the driving unit 70 moves forward by the weight of the body with the nozzle 11 facing downward (in addition, Manual movement is available). Here, since the outer diameter of the rear convex portion 33 is substantially equal to the inner diameter of the sliding concave portion 23, the driving unit 70 does not generate lateral vibration when the driving unit 70 moves forward.

Since the driving unit 70 is fixed in a state in which the rear stopper 52 is in contact with the rear abutting portion 45, if the front end 13 of the plunger rod 41 reaches the contact position 12 of the inner wall of the contact liquid chamber 14, the downward movement is performed. A state restricted by the plunger 40 is formed. This state is called "norm state".

When the front end 13 of the plunger rod 41 is at the contact position 12 and the rear abutment portion 45 abuts against the rear stopper 52, the fixing screws 54A, 54B are locked to fix the body 71 to the base member 27. on.

In addition, the moving member 30 is located at the forefront, and a state in which a gap occurs is formed in front of the body 71 and behind the rotary knob 32.

Hereinafter, description will be made with reference to FIG. 3(b).

When the rotary knob 32 is rotated in the square direction, only the moving member 30 moves rearward. Since the rear concave portion 22 and the front convex portion 31 of the discharge block 81 are fixed to the base member 27, the screws are screwed, and the sliding concave portion 23 and the rear convex portion 33 are slidable.

If the rotary button 32 continues to be rotated to the right, finally, the rotary button 32 will eventually contact the front of the body 71. Since the main body 71 is fixed to the base member 27 by the fixing screws 54A, 54B, if the rotary knob 32 is in contact with the main body 71, the rotary knob 32 cannot be rotated further. The memory 29 of the moving member 30 memorizes the value because the value when the specification state is set to the stop position at the time of entry and exit is expressed as S ₀ .

Hereinafter, description will be made with reference to FIG. 4(c).

When the fixing screws 54A and 54B are loosened, the rotary knob 32 is further rotated, and the rear surface of the rotary knob 32 slides the front end surface of the main body 71 while pressing the main body 71 rearward. Since the body 71 is in a state in which the forward movement is possible, it moves rearward together with the moving member 30. The amount of movement of the main body 71 is such that the distance between the front end 13 and the contact position 12 can be accurately grasped by comparing the value of the memory 29 with the value S ₀ when the specification state is set to the stop position at the time of entry and exit.

When the body 71 moves rearward, the plunger 40 moves rearward by the action of the front abutting portion 43 in a state of coming into contact with the front stopper 51, thereby causing the front end 13 of the plunger rod 41 to move away from the contact position 12.

In the case of confirming the memory 29, when the required distance portion is moved backward, the rotation of the rotary knob 32 is stopped. When moving excessively toward the rear, the rotary knob 32 is rotated in the reverse direction to be adjusted. At this time, since the position of the moving member 30 becomes out of the stop position of the plunger 40, and thus put the memories 29 memory value S _1. Further, the preferred stop position of the plunger 40 is preferably determined by performing a test in advance.

According to the above operation, the stop position of the plunger 40 at the time of entry and exit can be adjusted to a desired position where the front end 13 of the plunger rod 41 does not contact the contact position 12.

If the stop position of the plunger 40 is adjusted when the entry and exit is completed, the fixing screws 54A, 54B are locked, and the drive unit 70 is fixed to the base member 27. Further, a fixing screw (not shown) can be used to fix the rotation of the rotary knob 32.

Hereinafter, description will be made with reference to FIG. 4(d).

The micrometer 69 is rotated to retract the rear stopper 52, and the amount of movement when the plunger 40 is retracted at the time of discharge is determined. When the amount of movement of the plunger 40 in the backward movement is determined, in order to prevent the micrometer 69 from rotating, it is convenient to use a fixing screw (not shown). The rotary lock member fixes the micrometer 69. According to the above operation, the stop position setting operation of the plunger 40 is completed.

After the second and subsequent operations, after setting to the normal state, the body (ie, the front stop 51) is moved backward by the required distance portion (S ₁ -S ₀ ) by the moving member, so that the column can be moved. The stop position of the plug 40 when entering and leaving is set at the same position as the previous time. Therefore, by performing the test in advance, and recording the stop position of the plunger 40 which can be discharged well, the setting operation can be performed even after the test is not performed.

However, when there is a change in temperature, humidity, or other factors that are not controlled, since the stop position of the plunger 40 is also changed when it is better to enter and exit, a good discharge cannot be obtained as in the previous same setting. Therefore, it is necessary to perform the test, and even in this case, the time taken for the test can be shortened by starting the stop position of the plunger 40 from the previous position. Since the discharge conditions are the same except for environmental changes, the stop position of the plunger 40 does not change much when it is better.

Further, instead of the memory 29, a display device such as a liquid crystal may be used instead to display a value indicating the position of the moving member 30. In this case, if the value indicating the position at the time of the specification state is set to display zero, the display value can be used to grasp the preferred retreat distance at which the plunger 40 retreats from the contact position 12.

[6] Discharge operation

1) Setting before discharge operation

The pressure of the air supplied from the air supply source 73 to the front piston chamber 62 is set to a pressure against the coil spring 66 to move the piston 44 rearward. force.

The pressure of the air supplied from the pneumatic batching machine 3 to the liquid material storage container 5 is set to the required pressure for supplying the liquid material to the liquid chamber 14. The time (timing) at which the air is supplied from the pneumatic batching machine 3 is set so as not to cause a liquid material leakage from the discharge port 10 to be described later.

2) Standby state before discharge operation

Hereinafter, reference is made to Fig. 5(e).

The signal is transmitted from the control unit to the electromagnetic switching valve 72, and the front piston chamber 62 is set to be in communication with the outside (i.e., the atmosphere is open). When the front piston chamber 62 is in an open state, the coil spring 66 is conveniently moved forward by the coil spring 66, and is stopped in a state where the front contact portion 43 abuts against the front stopper 51.

By adjusting the position of the front stopper 51 by the prior setting, the distance between the distal end 13 of the plunger rod 41 and the contact position 12 in the liquid chamber 14 can be set to a desired interval. A liquid state from the liquid material storage container 5 is formed in the liquid chamber 14 to be filled. In this case, air is supplied to the liquid storage container 5 by the pneumatic batching machine 3 in a state where the front end 13 of the plunger rod 41 is separated from the discharge port 10, and is sent into the liquid chamber 14 via the liquid supply tube 6. .

In the standby state, air supply from the pneumatic batching machine 3 to the liquid material storage container 5 is not performed. That is, the inside of the liquid material storage container 5 will be in an open state, and the transfer of the liquid material will be in a stopped state. In this state, even if a gap occurs between the front end 13 of the plunger rod 41 and the contact position 12 in the liquid chamber 14, the liquid material does not leak from the discharge port 10 of the nozzle 11. here, Even if the supply of pressurized air is not performed, the force for transferring the liquid material into the liquid chamber 14 due to the weight of the liquid material will be generated, but because the front end 13 of the plunger rod 41 and the contact position 12 in the liquid chamber 14 The gap between the two is very small, so there is usually no leakage due to the weight of the liquid material. However, when there is a possibility that the liquid material leaks in accordance with various uncontrolled conditions, etc., the air in the liquid material storage container 5 can be sucked by the pneumatic batching machine 3, and the occurrence of the nozzle 11 can be surely prevented. Liquid material leakage.

3) Discharge operation

Hereinafter, reference is made to Fig. 5(f).

The signal is transmitted from the control unit to the electromagnetic switching valve 72, and the air supply source 73 is brought into communication with the front piston chamber 62 via the front air flow path 48. If air is supplied from the air supply source 73 to the front piston chamber 62, since the supplied air pushes the piston 44 rearward, the coil spring 66 will contract and the piston 44 will move rearward. At this time, air is supplied by the pneumatic batching machine 3, and the inside of the liquid material storage container 5 is pressurized. In response to this, if the plunger 44 is retracted by the retreat of the piston 44, the liquid material is supplied to the space originally occupied by the plunger rod 41 in the liquid chamber 14. Therefore, even if the plunger rod 41 retreats, no negative pressure is formed in the liquid chamber 14, and there is no problem that air is sucked from the discharge port 10.

The retreat of the plunger 40 is restricted by the rear abutment portion 45 abutting against the rear stopper 52, which is the same as described above.

Further, in the present embodiment, air pressurization is often performed in the liquid material storage container 5 during the discharge operation.

Hereinafter, reference is made to Fig. 5(g).

A signal is transmitted from the control unit to the electromagnetic switching valve 72 to form a state in which the front piston chamber 62 is in communication with the outside. When the front piston chamber 62 is in an open state, it is convenient to press the piston 44 with the coil spring 66, and the plunger 40 will move forward in a hurry. Then, when the front abutment portion 43 of the piston 44 abuts against the front stopper 51 of the piston chamber 61, the movement of the plunger 40 toward the front is suddenly stopped. The front end 13 of the plunger rod 41 is also stopped just before it abuts against the inner wall of the liquid chamber 14.

The advancement of the plunger 40 imparts an inertial force toward the front of the liquid material in front of the front end 13 of the plunger rod 41. The front end 13 of the plunger rod 41 is stopped before the contact position 12 is just as described above, and the liquid material is discharged from the discharge port 10 in the state of the droplet by the inertial force given to the liquid material by the plunger rod 41. At this time, since the tip end 13 of the plunger rod 41 does not come into contact with the inside of the liquid chamber 14, there is no need to worry about the filler such as particles contained in the liquid material in the liquid chamber 14, which adversely affects the discharge.

In order to be discharged from the discharge port 10 in the state of the droplets, it is preferable to position the front end 13 of the plunger rod 41 at the time of advancement and stop as close as possible to the contact position 12, and the stop position when the plunger 40 enters and exits is preferably The front end 13 of the plunger rod 41 and the filler interposed between the inner wall of the liquid chamber 14 and the inner wall of the liquid chamber 14 are prevented from collapsing as much as possible.

The discharge operation is performed by repeating the above operations.

In the apparatus of this embodiment, the discharge of a single portion is accomplished by causing the plunger 40 to reciprocate (reverse ‧ forward). By repeating the discharge of the single serving, the discharge can be continuously performed. The plunger 40 is reciprocally moved in a range of 0.01 second to 0.1 second.

As described above, according to the apparatus of the present embodiment, since the plunger 40 is stopped by the front stopper 51, even if the plunger 40 moving at a high speed can be stopped rapidly at the correct position, a sufficient inertial force can be applied to the liquid material.

[Embodiment 2]

The apparatus of the first embodiment is usually subjected to air pressurization in the liquid material storage container 5 after the discharge operation is started. However, the apparatus of the present embodiment stops the liquid material storage container 5 after the start of the discharge operation. Air supply. That is, in the present embodiment, with the apparatus of the first embodiment, it is possible to more reliably prevent the liquid material from passing between the front end 13 of the plunger rod 41 and the liquid chamber 14, and the leakage from the discharge port 10 is controlled.

The discharge control of this embodiment will be described with reference to the time charts of Fig. 6 and Fig. 7(a).

Fig. 6 shows a substrate on which an object to be coated at a discharge position is indicated. Points (i) to (iv) in the figure refer to the positions at which the discharge will be performed. The discharge device is moved at a constant speed in the direction of the arrow in the drawing, and is not stopped even during discharge. The movement can be moved by either of the substrate and the discharge device.

Fig. 7(a) is a timing chart showing the operation of the plunger rod 41, the pressurized state of the pneumatic batching machine 3, and the state of the electromagnetic switching valve 72. In the diagram of the electromagnetic switching valve 72, the state in which the front piston chamber 62 communicates with the air supply source 73 is "ON", and the state in which the front piston chamber 62 communicates with the outside is "OFF". The pattern of the pneumatic batching machine 3 sets the state in which the pressurized air supply is performed to "ON".

Since the plunger rod 41 is advanced and discharged as shown in each of the discharge positions shown in Fig. 6, the plunger rod 41 must start to retreat in front of the discharge position.

When the discharge port 10 is close to the discharge position (i) shown in Fig. 6 (time a), it is convenient to switch the electromagnetic switching valve 72 to ON by the signal from the control unit, and the plunger rod 41 is retracted. At the same time, the pneumatic batching machine 3 is turned "ON" by the signal from the control unit, and pressurized air is supplied to the liquid material storage container 5, and liquid supply to the liquid chamber 14 is started.

The retreat of the plunger rod 41 ends before the discharge port 10 reaches the discharge position (i). When the discharge device reaches the discharge position shown in (i) (time b), it is convenient to switch the electromagnetic switching valve 72 to "OFF" by the signal from the control unit, and the plunger rod 41 advances.

The supply of pressurized air is supplied from the pneumatic batching machine 3, and if the set time has elapsed, it is automatically turned "OFF". Then, the liquid droplets are discharged from the discharge port 10 of the nozzle 11 by the advancement of the plunger rod 41.

Next, the discharge port 10 will move toward the discharge position (ii) on the substrate. While reaching the vicinity of the discharge position (ii) and the plunger rod 41 starts to retreat, that is, during the period before the next discharge is started, the plunger rod 41 does not move in the front-rear direction but stops, and the plunger rod 41 The front end 13 does not smash the discharge port 10. In this state, the pneumatic batching machine 3 does not supply pressurized air to the liquid material storage container 5, and does not supply the liquid material into the liquid chamber 14, so that the liquid material is not leaked from the discharge port 10.

The action during the time c~e is also performed in the same action as the time a~c. That is, after the discharge at the discharge position (ii), the movement to the discharge position (iii) is the same as the operation of moving to the discharge position (ii) after the discharge at the discharge position (i).

In Fig. 6, the discharge positions (iii) and (iv) are very close. For this The action in the case will be explained.

When the discharge port 10 approaches the discharge position (iii) (time e), it is convenient to switch the electromagnetic switching valve 72 to "CN" by a signal from the control unit, and the plunger rod 41 is retracted. At the same time, the pneumatic batching machine 3 is turned "ON" by the signal from the control unit, and pressurized air is supplied to the liquid material storage container 5, and the liquid material is supplied to the liquid chamber 14.

The retreat of the plunger rod 41 is completed before the discharge port 10 reaches the discharge position (iii). When the discharge port 10 reaches the discharge position (iii) (time f), it is convenient to switch the electromagnetic switching valve 72 to "OFF" by the signal from the control unit, and the plunger rod 41 that has been retracted is advanced.

Since the discharge at the discharge position (iii) is completed, the discharge must be performed immediately at the discharge position (iv), so that the pneumatic batcher 3 will continue to supply the pressurized air. That is, the pneumatic batching machine 3 will remain in the "ON" state. The liquid material is discharged from the discharge port 10 of the nozzle 11 in the liquid discharge state to the discharge position (iii) by the advancement of the plunger rod 41.

After the advancement movement of the plunger rod 41 is completed, the discharge port 10 will be located at the discharge position close to (iv) and become the time g. Immediately by switching the electromagnetic switching valve 72 to "ON" by the signal from the control unit, the plunger rod 41 is retracted. Since the pneumatic batching machine 3 will remain in the "ON" state, the supply of the liquid material in the liquid chamber 14 will be performed.

The retreat of the plunger rod 41 is completed before the discharge port 10 reaches the discharge position (iv). When the discharge port 10 reaches the discharge position (iv) (i.e., time h), it is convenient to switch the electromagnetic switching valve 72 to "OFF" by the signal from the control unit, and the retracted plunger rod 41 will advance. .

Since the discharge is performed immediately after reaching the discharge position (iv), the pneumatic batcher 3 is set to "OFF", and the supply of pressurized air in the liquid material storage container 5 is stopped. By the advancement of the plunger rod 41, the liquid material is discharged from the discharge port 10 of the nozzle 11 to the discharge position (iv) in a liquid droplet state.

In this case, the present embodiment stops the supply of pressurized air to the liquid material storage container 5 by the pneumatic batching machine 3 by stopping the plunger rod 41 between the discharge and the discharge, and stops the liquid chamber 14 from being stopped. The liquid material supply therein will thus prevent the liquid material from leaking from the gap of the discharge port 10.

Further, as the discharge at the discharge positions (iii) and (iv) is closer to the discharge and discharge period, since the discharge from the discharge position (iii) is ended to the start of the discharge at the discharge position (iv) Since the time is short, even if the plunger rod 41 is stopped, the liquid material leakage from the discharge port 10 hardly occurs. Therefore, in the case where the supply of pressurized air to the liquid material storage container 5 is not stopped by the pneumatic batching machine 3, there is no problem in performing the discharge.

Further, even if the interval between the discharge and the discharge is short and the discharge is affected, the supply of the pressurized air is stopped as in the movement from the discharge position (i) to (ii).

Further, when the discharge of the substrate shown in Fig. 5 is completed, the liquid in the liquid chamber 14 is stopped by stopping the supply of the pressurized air by the pneumatic batching machine 3 until the discharge of the next substrate is performed. When the material is supplied, liquid leakage will not occur from the discharge port 10.

The pneumatic batching machine 3 is adapted to perform the supply time of the pressurized air, because it will vary depending on the liquid material, the discharge condition, etc., and thus is performed before the discharge is started. Test and calculate to find the appropriate time and set. Here, the supply stop timing of the pressurized air may be stopped before the plunger rod 41 starts to advance, or may be stopped after the plunger rod 41 has finished advancing, and may be appropriately selected in accordance with discharge conditions and the like.

In the present embodiment, the pressurized air supply time by the pneumatic batching machine 3 is controlled by the pneumatic batching machine 3, but the supply of the pressurized air can be stopped by transmitting a signal from the control unit.

[Example 3]

Up to the time until the liquid material is supplied from the pneumatic batching machine 3 to transfer the liquid material into the liquid chamber 14, and the electromagnetic switching valve 72 is switched, the air supply source 73 is communicated with the front piston chamber 62, and There is a variation in the time until the plunger rod 41 is retracted.

7(b) shows the time until the liquid material is supplied into the liquid chamber 14 by the air supply from the pneumatic batching machine 3, and the air supply source 73 is slower than the switching electromagnetic switching valve 72. A timing chart showing the time until the front piston chamber 62 is in communication and the plunger rod 41 is retracted.

The transfer of the liquid material in the liquid chamber 14 is carried out by supplying pressurized air from the pneumatic batching machine 3 into the liquid material storage container 5, so that a time lag phenomenon easily occurs. Further, even if a liquid supply device other than the pneumatic batching machine 3 is used, there are many cases where a time lag occurs.

In this case, by the time when the pressurized air is supplied from the pneumatic batching machine 3 to the liquid material storage container 5, it is set earlier than the switching time of the electromagnetic switching valve 72 so as to be placed in the plunger rod. When the 41 is retracted, the liquid material is supplied into the liquid chamber 14. The control of the action time is controlled by the control unit. The pneumatic batcher 3 and the electromagnetic switching valve 72 transmit signals for implementation.

The difference between the time when the pneumatic batching machine 3 starts to supply the air to the liquid material storage container 5 and the time when the electromagnetic switching valve 72 switches the valve to the time when the plunger rod 41 starts to retreat is referred to as "deviation time". The deviation time is set by the setting unit 1. The setting of the setting unit 1 is a case where the operator inputs a deviation time from a keyboard, a controller, or the like, and a case where it is automatically set by computer calculation.

In the present embodiment, as shown in the time chart shown in FIG. 7(b), the pressurized air supplied by the pneumatic batching machine 3 is started to be supplied according to the signal from the control unit, and the difference between the early deviation times: time a', time c ', time e' is implemented. In this way, the effects caused by the deviation time can be eliminated. The device configuration and other controls are as in Embodiment 2.

In addition, the operation of the plunger rod 41 and the supply of the liquid material to the liquid chamber 14 are all synchronized, and the timing of the arbitrary offset can be set within a range in which the discharge is performed well.

[Example 4]

As shown in Fig. 8, the apparatus of this embodiment is such that the rear convex portion 33 of the moving member 30 directly abuts against the front abutting portion 43, and the body 71 belongs to a structure that does not move. The body 71 will be fixed to the base member 27 to form a state in which it is impossible to move forward and backward.

The front convex portion 31 of the moving member 30 is screwed into the rear concave portion 22 of the discharge block 81. The rear convex portion 33 is slidably inserted into the sliding hole 25 of the body 71. The rear end surface of the rear convex portion 33 will constitute the front stopper 51 and reach the front piston chamber 62. The inner peripheral surface of the sliding hole 25 is provided with a ring shape A groove, and an annular seal 18D will be provided in the groove. The seal 18D will be in close contact with the moving member 30, because the moving state will maintain the close state when the moving member 30 moves the body 71, so that the air in the piston chamber 61 does not pass through the gap and leaks to the outside.

A through hole 34 through which the plunger 40 is inserted is formed in the central axis of the moving member 30. Since the inner diameter of the through hole 34 is equal to the outer diameter of the joint portion 42, the plunger 40 does not vibrate in the lateral direction. An annular groove is provided on the inner circumferential surface of the through hole 34, and an annular seal 18E is provided in the groove. The seal 18E is in close contact with the joint portion 42, and even if the plunger 40 maintains the close contact state when the moving member 30 moves forward and backward, the air in the piston chamber 61 does not pass through the gap and leaks to the outside.

When the rotary knob 32 is rotated in the square direction, the front stopper 51 moves rearward toward the contact position 12. When the rotary knob 32 is rotated in the reverse direction, the moving member 30 moves toward the contact position 12 toward the front. The memory 29 is set as in the first embodiment on the surface of the rotary knob 32.

The front recess 21 of the discharge block 81 is fitted into the nozzle 11. The cylindrical space formed inside the nozzle 11 belongs to the liquid chamber 14. The liquid chamber 14 is a space having a diameter larger than that of the plunger rod 41, and a discharge port 10 is provided at the center in the front. The front end 13 of the plunger rod 41 is moved in and out, and is brought into contact with the inner wall of the liquid chamber 14 to become the contact position 12. At the contact position 12, the front end 13 is configured to block the end of the discharge port 10.

The procedure for setting the stop position of the plunger rod 41 of the apparatus of the present embodiment will be described.

Moving the moving member 30 as far as possible forward, and blocking the front 51 The position is moving forward. In this case, since the plunger 40 is biased toward the front by the coil spring 66, it will advance together with the front stopper 51. Next, if the rotary knob 32 is rotated in the left direction, the plunger 40 is moved forward, and the front end 13 of the plunger rod 41 will contact the inner wall of the liquid chamber 14 (to reach the contact position 12) because the plunger 40 will not be able to Moving further, only the moving member 30 will move forward. Then, the front stopper 51 and the front abutting portion 43 are in an uncontacted state.

The micrometer 69 is manipulated to advance the rear stopper 52, and the rear abutment portion 45 is brought into contact with the rear stopper 52 to restrict the backward movement of the plunger 40. Whether or not the rear abutment portion 45 has abutted against the rear stopper 52 can be judged by the fact that the micrometer 69 can no longer perform the forward movement operation.

When the reverse movement of the plunger 40 is restricted, the rotary knob 32 is rotated to move the moving member 30 rearward so that the front stopper 51 abuts against the front abutment portion 43. Whether or not the front stopper 51 has abutted against the front abutting portion 43 can be easily judged by the fact that the moving member 30 can no longer move rearward.

By the above operation, the front end 13 of the plunger rod 41 comes into contact with the inner wall of the liquid chamber 14, and the front abutting portion 43 comes into contact with the front stopper 51. This state is called the "norm state." The value of the memory 29 at the time of the specification state is memorized.

When the micrometer 69 is operated from the normal state, the rear stopper 52 is retracted, and the plunger 40 is moved rearward by sufficiently leaving the rear abutment portion 45.

Further, when the rotary knob 32 is rotated to move the moving member 30 rearward, the front stopper 51 moves the front abutting portion 43 rearward. Upon retraction by the plunger 40, the front end 13 of the plunger rod 41 will leave the contact position 12. At this time, the amount of movement of the front stopper 51 is accurately grasped by comparing the value of the memory 29 with the standard state. When the value of the memory 29 is confirmed, only the required distance portion is moved toward the rear, and the rotation of the rotary knob 32 is stopped. When excessively moving toward the rear, the rotary knob 32 is rotated in the reverse direction. In this case, the plunger rod 41 can be stopped at the time of entry and exit, and is formed at a desired position where the front end 13 of the plunger rod 41 does not come into contact with the contact position 12.

The micrometer 69 is manipulated to retract the rear stopper 52, and the amount of movement of the plunger 40 after the discharge is determined. When the amount of rearward movement of the plunger 40 is determined, in order to prevent the micrometer 69 from rotating, the micrometer 69 is easily fixed by a rotary lock member such as a fixing screw (not shown). By the above operation, the retracted position of the plunger 40 is adjusted.

The apparatus of the present embodiment and the apparatus of the first embodiment further differ in the shape of the tip end 13 of the nozzle 11 and the plunger rod 41, and the configuration of the liquid material supply flow path 17.

In the apparatus of the first embodiment, the inner wall of the nozzle 11 faces the discharge port 10 and the inner surface thereof is formed in a mortar shape, and the apparatus of the present embodiment forms the small diameter of the side of the discharge port 10 connected to the large diameter of the liquid chamber 14 side. The shape of the hole, and the connecting portion will form a right-angled surface with respect to the front-rear direction.

Further, the front end 13 of the plunger rod 41 of the apparatus of the present embodiment is flat.

Furthermore, the device of the embodiment does not use the liquid supply tube 6, but is used in the hard The liquid storage tank 5 is connected to the liquid material supply flow path 17 by the flow path provided in the liquid feed member 8.

The rest of the construction was the same as that of the apparatus of Example 1, and the discharge operation was also the same as that of the apparatus of Example 1.

The configuration of the moving member 30 is not limited to the configuration of the embodiment and the embodiment 1, as long as the distance between the front stopper 51 and the contact position 12 can be adjusted. Preferably, when the front stopper 51 is moved forward, the front end 13 reaches the contact position 12, and the front stopper 51 is separated from the front abutment portion 43. Further, it is preferable that the front end 13 reaches the contact position 12, and the front stopper 51 abuts against the front abutment portion 43, and the structure can be grasped from the outside.

[Example 5]

The apparatus of this embodiment is shown in Fig. 9. Instead of the pneumatic batching machine 3, the pump 7 is used to constitute the liquid feeding means. The pump 7 is provided in the middle of the liquid supply pipe 6 that connects the liquid material storage container 5 and the liquid material supply flow path 17. The configuration of the pump 7 is not particularly limited, and may be, for example, a tube pump 7 that supplies a liquid from a liquid material transfer tube by means of a roll, a metering piston 44, and a piston pump including a switching valve.

In the apparatus of this embodiment, the liquid material in the liquid material storage container 5 can be transferred to the liquid chamber 14 by causing the pump 7 to operate. The remaining related configurations are the same as those of the embodiment 1.

The apparatus of this embodiment preferably controls the operation of the pump 7 in accordance with the movement of the plunger 40 as in the second and third embodiments.

[Embodiment 6]

The apparatus of this embodiment is shown in Fig. 10. The forward and backward movement of the plunger 40 is performed by magnetic force. The apparatus of this embodiment is provided with the electromagnetic coil 67 of the moving mechanism of the plunger 40 in the drive unit 70. The front end of the micrometer 69 will form a core core, and the front end of the core core will constitute a rear stop 52. The rear abutting portion 45 is made of a magnetic material. A coil spring 66 is disposed between the rear end surface of the piston chamber 60 and the rear end surface of the piston 44.

In the apparatus of this embodiment, if a current flows through the electromagnetic coil 67, the core is magnetized, and the magnetized core attracts the rear abutment portion 45 of the magnetic body, and the plunger 40 is retracted. When the rear abutting portion 45 has abutted against the rear stopper 52, the retreat of the plunger 40 is stopped. When the current is stopped flowing through the electromagnetic coil 67, the rear stopper 52 loses the force of sucking the rear abutting portion 45, so that the plunger 40 is easily advanced by the elastic force of the coil spring 66.

In the apparatus of this embodiment, since the front and rear movement of the plunger 40 does not utilize air, the sealing of the drive unit 70 will not be required. Therefore, the elements constituting the forward and backward movement resistance of the plunger 40 are reduced, so that the plunger 40 can be moved back and forth more smoothly. The remaining related configurations are as in Example 1.

The mechanism for moving the plunger 40 forward and backward may also have other configurations. For example, a configuration in which air is supplied to both the front piston chamber 62 and the rear piston chamber 63 can be utilized to move the plunger 40 forward and backward. The electromagnetic actuator fixed to the main body 71 may be connected to the rear of the plunger 40, and the plunger 40 may be moved forward and backward by only the expansion and contraction of the electromagnetic actuator. In this case, it is also preferable to restrict the movement by the front stop 51 before and after. In other words, the plunger 40 is configured to advance at a high speed and abuts against the front stopper 51 to stop the advancement of the plunger 40.

[Embodiment 7]

The apparatus of the first embodiment, when the front end 13 of the plunger rod 41 is located at the contact position 12, facilitates the use of the front end 13 to block the discharge port 10, so that the liquid material does not leak from the discharge port 10, Set the specification status in order.

First, the electromagnetic switching valve 72 is switched to a state in which the front piston chamber 62 communicates with the outside. The rotary knob 32 is rotated to move the moving member 30 to the foremost state. The fixing screws 54A, 54B are loosened, so that the main body 71 is movable forward and backward with respect to the base member 27, and the driving unit 70 is moved forward by the self-weight, so that the front end 13 of the plunger rod 41 contacts the liquid chamber. The upstream wall of the discharge port 10 in the 14 is 14 . The position of the front end 13 of the plunger rod 41 becomes the contact position 12, and becomes a state in which the discharge port 10 of the nozzle 11 is blocked upstream. At this time, in the present embodiment, as shown in the first embodiment, the rearward movement of the plunger 40 is not regulated by the micrometer 69. Therefore, the front stopper 51 is separated from the front abutting portion 43 by the weight of the driving unit 70, and is stopped at a position where the coil spring 66 is equalized.

Next, pressurized air is supplied into the liquid material storage container 5 by the pneumatic batching machine 3. However, in this state, since the front end 13 of the plunger rod 41 will block the upstream of the discharge port 10, the liquid material does not leak from the discharge port 10.

When the maintenance device is tilted downward, the rotary knob 32 is rotated to move the moving member 30 rearward, and finally, the rotary knob 32 of the moving member 30 is brought into contact with the front end surface of the body 71. If the rotary knob 32 is further rotated to move the moving member 30 rearward, the rear of the rotary knob 32 will be pushed to move the body 71 rearward, whereby the front The position of the stop 51 will also move toward the rear.

At this time, since the plunger rod 41 is pushed forward by the coil spring 66, the plunger rod 41 does not move rearward until the front stopper 51 abuts against the front abutting portion 43, and the front end 13 is kept blocked. The state of the discharge port 10. When the front stopper 51 abuts against the front abutment portion 43, since the front stopper 51 pushes the plunger rod 41 rearward, the body 71 moves rearward together with the plunger rod 41. In accordance with this, the front end 13 of the plunger rod 41 will be moved upstream of the discharge port 10. Since the liquid storage container 5 is supplied with pressurized air by the pneumatic batching machine 3, the liquid material is leaked from the discharge port 10 where the gap occurs.

When the liquid material leaks from the discharge port 10, since the position belonging to the front end 13 is not the contact position 12, the state before this moment can be judged to be the normal state. The moving member 30 is moved forward, and the front stopper 51 is slightly returned to the front position as the "standard state".

If it has been set in the specification state, the fixing screws 54A, 54B are locked, and the body 71 is fixed to the base member 27.

The value of the memory 29 of the moving member 30 at the time of the normal state is memorized. Then, the stop position of the plunger rod 41 when entering and leaving is set as in the first embodiment.

[Embodiment 8]

The apparatus of this embodiment is configured such that a liquid material storage container 5 for storing a liquid material is disposed at the lower end of the discharge apparatus. Therefore, the liquid chamber 14 is not provided with the liquid material supply port, and the liquid material is directly supplied from the liquid material storage container 5. The discharge block 81 is provided with a seal 18C because it is not in contact with the liquid material during normal use, and thus It can also be set.

The liquid material storage container 5 is held by engaging the flange holding member 86 provided on the bottom surface of the base member 27 with the flange 95 formed at the upper end of the liquid material storage container 5. The flange 85 and the flange holding member 86 constitute a detachable structure, and when the liquid material is exhausted or replaced with another liquid material, the liquid material storage container 5 can be easily replaced.

The apparatus of this embodiment is also provided with the moving member 30 and the long hole 53, and the stop position setting of the plunger 40 is performed after the setting specification state as in the apparatus of the first embodiment. The operation of the discharge operation is also the same as that of the embodiment 1.

In the apparatus of the present embodiment, the plunger 40 is stopped by the front stopper 51, and even if the plunger 40 that moves at a high speed can be stopped at a correct position, a sufficient inertial force can be applied to the liquid material.

In the present embodiment, for example, the pneumatic batching machine 3 as in the first embodiment can be connected to the liquid material storage container 5, and the supply and discharge of air in the liquid material storage container 5 can be performed, and the liquid material storage container 5 can be implemented. The liquid material is pressurized and depressurized. Further, the pressurization and decompression performed by the pneumatic batching machine 3 can be interlocked with the advancement and retreat movement of the plunger rod 41 as in the second embodiment. In addition, instead of the pneumatic batching machine 3, the liquid material in the liquid material storage container 5 may be pressurized and reduced by using a pressing member such as a piston provided in the liquid material storage container 5 or another pressure mechanism. Pressure.

1‧‧‧Setting Department

2‧‧‧Control Department

3‧‧‧Pneumatic batching machine

4‧‧‧ air tube

5‧‧‧Liquid storage container

6‧‧‧ Liquid supply tube

7‧‧‧ pump

8‧‧‧ liquid supply member

10‧‧‧Export

11‧‧‧Nozzles

12‧‧‧Contact location

13‧‧‧ front end

14‧‧‧ liquid room

16‧‧‧Liquid supply port

17‧‧‧Liquid supply channel

18, 18A, 18B,

18C, 18D, 18E‧‧ ‧ seal

21‧‧‧Front recess

22‧‧‧ Rear recess

23‧‧‧Sliding recess

24, 26, 34‧‧‧through holes

25‧‧‧Sliding hole

27‧‧‧Base member

29‧‧‧Memory

30‧‧‧Mobile components

31‧‧‧ front convex

32‧‧‧Rotary button

33‧‧‧ Rear convex

40‧‧‧Plunger

41‧‧‧Plunger rod

42‧‧‧Connecting Department

43‧‧‧ forward abutment

44‧‧‧Piston

45‧‧‧ Rear Abutment

48‧‧‧ front air flow path

49‧‧‧ Rear air flow path

51‧‧‧ Front stop

52‧‧‧ Rear stop

53, 53A, 53B‧‧‧ long holes

54, 54A, 54B‧‧‧ fixing screws

61‧‧‧Piston room

62‧‧‧ front piston chamber

63‧‧‧ rear piston chamber

64‧‧‧Spring Room

66‧‧‧ coil spring

67‧‧‧Electromagnetic coil

68‧‧‧core

69‧‧‧Micrometer

70‧‧‧ drive unit

71‧‧‧Ontology

72‧‧‧Solenoid valve (electromagnetic switching valve)

73‧‧‧Air supply

80‧‧‧Draining unit

81‧‧‧Discharge block

85, 95‧‧‧Flange

86‧‧‧Flange retaining members

99‧‧‧Liquid discharged in the state of droplets

Fig. 1 is an external view of a droplet discharge device of the first embodiment.

Fig. 2 is a cross-sectional view showing the main body, the discharge block, and the front stop position adjusting mechanism shown in Fig. 1.

Figures 3(a) and (b) are side views (1/3) showing important portions of the plunger stop position setting.

Figures 4(c) and (d) are side views (2/3) showing important parts of the plunger stop position setting.

Figures 5(e) to (g) are side views (3/3) showing important parts of the plunger stop position setting.

Fig. 6 is a substrate of an object to be coated at a discharge position.

Fig. 7a is a timing chart (1/2) showing the operation of the plunger rod and the like.

Fig. 7b is a timing chart (2/2) showing the operation of the plunger rod and the like.

Fig. 8 is a cross-sectional view showing an external view and an essential part of the droplet discharge device of the fourth embodiment.

Fig. 9 is a cross-sectional view showing an external view and an essential part of the liquid droplet discharging device of the fifth embodiment.

Fig. 10 is a cross-sectional view showing an external view and an essential part of the liquid droplet discharging device of the sixth embodiment.

Figure 11 is a cross-sectional view showing an external view and an essential part of the liquid droplet discharge device of the eighth embodiment.

12‧‧‧Contact location

13‧‧‧ front end

14‧‧‧ liquid room

16‧‧‧Liquid supply port

17‧‧‧Liquid supply channel

18A, 18B, 18C‧‧‧ Seal

21‧‧‧Front recess

22‧‧‧ Rear recess

23‧‧‧Sliding recess

24, 26, 34‧‧‧through holes

31‧‧‧ front convex

33‧‧‧ Rear convex

40‧‧‧Plunger

41‧‧‧Plunger rod

42‧‧‧Connecting Department

43‧‧‧ forward abutment

44‧‧‧Piston

45‧‧‧ Rear Abutment

48‧‧‧ front air flow path

49‧‧‧ Rear air flow path

51‧‧‧ Front stop

52‧‧‧ Rear stop

61‧‧‧Piston room

62‧‧‧ front piston chamber

63‧‧‧ rear piston chamber

64‧‧‧Spring Room

66‧‧‧ coil spring

81‧‧‧Discharge block

Claims (31)

A liquid droplet discharge device includes: a liquid chamber having a discharge port for discharging the liquid material; a through hole that communicates with the liquid chamber; and a column that is inserted into the through hole and whose front end portion moves forward and backward in the liquid chamber a plunger moving mechanism that causes the plunger to move forward and backward; and a plunger positioning mechanism that regulates the position of the front end of the plunger; and the plunger is moved in and out by the front end portion of the plunger and the inner wall of the liquid chamber The movement and the stop of the movement to release the inertial force to the liquid material and to discharge according to the liquid droplet state; the liquid droplet discharge device is characterized in that the plunger positioning mechanism is configured to position the front end portion of the plunger when entering and exiting, It is near the inner wall of the liquid in the direction of its entry and exit. The liquid droplet discharge device according to claim 1, wherein the front end of the plunger at the time of stopping the entry and exit is located in the vicinity of the liquid chamber wall and the discharge port in the inlet and outlet direction. The liquid droplet discharge device according to claim 1 or 2, wherein the inner wall of the front end portion of the liquid chamber is formed in a conical shape having a discharge port at the foremost end. The liquid droplet discharging device according to claim 1 or 2, wherein the inner wall of the front end portion of the liquid chamber constitutes a flat surface on which the discharge port is provided. The liquid droplet discharge device of claim 1 or 2, wherein the plunger positioning mechanism is provided with a front abutting portion (43) provided on the plunger and a front abutting portion (43) The front stop (51) is opposite to each other, and the front contact portion (43) abuts against the front stop (51) to determine the stop position when the plunger enters and exits. The liquid droplet discharge device of claim 5, wherein the plunger positioning mechanism is provided with a moving member (30) capable of advancing and retracting the position, and the moving member (30) advances the position of the front stop. , and the stop position when the plunger is in and out can be adjusted. The liquid droplet discharge device of claim 6, wherein the moving member (30) is provided with a position display member that displays a position thereof. The liquid droplet discharge device of claim 6, wherein the liquid droplet discharge device includes: a body provided with a through hole (24) through which the plunger is inserted, and a piston chamber (61); and a discharge port and a liquid chamber a liquid supply port and a discharge block of the through hole (26) through which the plunger is inserted; the plunger is provided with a plunger rod and a width wider than the plunger rod and disposed in the piston chamber (61) The front abutting portion (43); the moving member (30) is provided with a through hole (34) through which the plunger is inserted, and is disposed between the main body and the discharge block. The liquid droplet discharging device according to claim 8, wherein the front stopper (51) is a surface facing the piston chamber (61) facing the surface of the front abutting portion (43). The liquid droplet discharge device of claim 8, wherein the distance between the main body and the discharge block is adjusted by advancing and retracting the position of the moving member (30) to adjust the position of the front stop. The liquid droplet discharge device according to claim 10, further comprising: a base member in which the main body is attached to the position to be advanced and retractable, and the discharge block is fixed and attached. Such as the droplet discharge device of claim 6 of the patent scope, wherein The front stopper (51) is constituted by the rear end portion of the moving member (30), and the position of the front stopper (51) can be adjusted by advancing and retracting the position of the moving member (30). The liquid droplet discharge device of claim 6, wherein the position of the plunger is adjusted to advance and fall of the position of the plunger to contact the position of the front end of the plunger to contact the inner wall of the liquid chamber. (12). The liquid droplet discharge device of claim 13, wherein the plunger front end is configured to block the discharge port at the contact position (12). The liquid droplet discharge device according to claim 13, wherein the plunger is provided with a rear abutting portion (45) on a side of the front abutting portion (43), and the plunger positioning mechanism is provided with: The rear abutment portion (45) abuts against the rear abutment (52) for retreating the plunger; and the rearward stop movement mechanism for moving the rear stopper (52) forward and backward. The liquid droplet discharge device according to claim 13, wherein the liquid droplet discharge device is provided with an elastic body that biases the plunger in an upward-and-out direction. The liquid droplet discharge device according to claim 1 or 2, further comprising: a liquid supply control device that supplies a liquid material to the liquid chamber in a forward/backward movement interlocking with the plunger. The liquid droplet discharging device according to claim 1 or 2, further comprising a pressure mechanism that changes a pressure of the liquid material applied to the liquid chamber in a forward/backward movement interlocking with the plunger. A method for discharging a liquid droplet, wherein the front end portion of the plunger and the inner wall of the liquid chamber are moved in and out of the plunger in a non-contact state, and the liquid is moved in and out, thereby stopping the liquid. The material imparts inertial force and flies out and discharges in a state of droplets; and the droplet discharge method is characterized in that: a liquid chamber having a discharge port; and a plunger whose front end portion is moved forward and backward in the liquid chamber The front end of the plunger is located near the inner wall of the liquid in the direction in which it enters and exits when its entry and exit is stopped. The liquid droplet discharging method of claim 19, wherein the plunger front end is located in the vicinity of the liquid chamber wall and the discharge port in the direction in which the plunger enters and exits. The liquid droplet discharging method according to claim 19 or 20, wherein the plunger is provided with a front abutting portion (43); and a front stop is provided opposite to the front abutting portion (43). The stop position at the time of plunger entry and exit is determined by abutting the front abutting portion (43) against the front stopper (51). The liquid droplet discharging method according to claim 21, wherein a moving member (30) capable of advancing and retreating is provided; and the position of the front stopper (51) is advanced and retracted by the moving member (30), thereby adjusting the column Stop position when plugging in and out. The liquid droplet discharging method according to claim 22, wherein the moving member (30) is provided with a position display member for displaying a position thereof, and the position of the moving member (30) is adjusted according to a display value of the position display member. The liquid droplet discharging method according to claim 22, wherein a surface facing the front abutting portion (43) in the direction in which the front side is in contact with the front side is provided with a piston chamber (61) constituting the front stopper (51). ); The position of the piston chamber (61) is adjusted by advancing and retracting the position of the moving member (30) to adjust the position of the front stopper (51). The liquid droplet discharging method according to claim 22, wherein the moving member (30) has a rear end portion that is opposite to a front side of the front abutting portion (43). The position of the front stop (51) is adjusted by advancing and retracting the position of the moving member (30). The liquid droplet discharge method of claim 22, wherein the adjustment of the stop position when the plunger enters and exits is performed by: positioning the front end of the plunger as a contact position (12) of the inner wall of the contact liquid, and a first step of bringing the front abutting portion (43) into contact with the front stopper (51); and moving the front abutting portion (43) in contact with the front stopper (51) to move The member (30) advances and retracts at a desired distance, and sets the position of the front end of the plunger to the second step of the distance required from the contact position (12). The liquid droplet discharging method according to claim 26, wherein the plunger front end plunger front end is configured to be in a contact position (12) contacting the inner wall of the liquid chamber to block the discharge port, and is in the first state described above. In the step, it is judged whether or not the position of the front end of the plunger is at the contact position (12) by the presence or absence of the liquid material flowing out from the discharge port. The liquid droplet discharging method according to claim 26, wherein the plunger is provided with a rear abutting portion (45) on a side in which the front abutting portion (43) is retracted, and is opposite to the rear abutting portion (45). ) with a rear that allows it to advance and retreat The stop (52); the rear abutment portion (45) abuts against the rear stop (52) to restrict the reverse movement of the plunger. The liquid droplet discharging method according to claim 19 or 20, wherein the liquid material is supplied to the liquid chamber in conjunction with the forward and backward movement of the plunger. The liquid droplet discharging method of claim 19 or 20, wherein the liquid material is a liquid material in which a filler is incorporated. The liquid droplet discharging method according to claim 19 or 20, wherein the pressure of the liquid material applied to the liquid chamber is changed in conjunction with the forward and backward movement of the plunger.