JP2018058007A - Fluid discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid discharge device which can adequately discharge a fluid which contains particles and a fluid which does not contain the particles.SOLUTION: A fluid discharge device includes a fluid chamber, a discharge hole for discharging a fluid, a plunger which moves to an opening of the discharge hole to the fluid chamber, and a delivery device 74 for delivering the fluid into the fluid chamber. The deliver device constantly delivers the fluid to the fluid chamber when the fluid is discharged from the discharge hole by abutting a tip end part of the plunger on the opening (a first discharge control execution part 160). On the other hand, the delivery device delivers the fluid with a timing the plunger moves when the fluid is discharged from the discharge hole without abutting the tip end part of the plunger on the opening (a second discharge control execution part 162). Thereby, the fluid which does not contain the particles is discharged by the first discharge control execution part, and the fluid which contains the particles is discharged by the second discharge control execution part. Thus, the fluid which contains particles and the fluid which does not contain the particles are discharged adequately.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a fluid ejection device that ejects fluid by movement of a plunger.

  The fluid discharge device includes a fluid chamber, a discharge hole for discharging the fluid, and a plunger that moves toward the opening of the discharge hole toward the fluid chamber. The fluid is discharged from the discharge hole by the movement of the plunger. There is something. In the fluid discharge device having such a structure, the plunger is normally moved until the tip of the plunger comes into contact with the opening of the discharge hole, whereby the fluid is discharged from the discharge hole. However, when particles are included in the fluid, that is, when solder paste or the like is used as the fluid, the particles of solder or the like may be crushed by the contact of the plunger. Then, the crushed particles are clogged in the discharge hole, and there is a possibility that the viscous fluid cannot be discharged properly. For this reason, as described in the following patent document, there has been a development of a fluid discharge device in which the plunger moves so that the tip portion thereof does not contact the opening of the discharge hole, and the fluid is discharged by the movement of the plunger. It is being advanced.

International Publication No. 2008/108097

  According to the fluid ejection device described in the above patent document, it is possible to eject a fluid containing particles while preventing the particles from being crushed. However, if the tip of the plunger does not come into contact with the opening of the discharge hole (inner wall of the fluid chamber), the fluid chamber is not sealed, so it is desirable to allow the fluid chamber to be filled only during discharge. . For this reason, the fluid ejection device described in the above-mentioned patent document is provided with a delivery device that feeds fluid to the fluid chamber in a controllable manner. And the fluid is sent out to the fluid chamber by operating the delivery device according to the timing of movement of the plunger. Thereby, the fluid sent out to the fluid chamber is discharged from the discharge hole by the plunger. On the other hand, at the time of non-ejection, the operation of the delivery device is stopped and the delivery of fluid to the fluid chamber is prohibited. In this way, by operating the plunger and the delivery device in conjunction with each other, the fluid is appropriately discharged without bringing the tip of the plunger into contact with the opening of the discharge hole.

  However, although the fluid ejection device described in the above-mentioned patent document is suitable for ejecting fluid containing particles, it is not suitable for ejecting fluid not containing particles. Specifically, in the fluid ejection device described in the above-mentioned patent document, the fluid chamber is filled only with fluid during ejection, so the fluid filling time in the fluid chamber is a loss time. Further, it is necessary to control the delivery device and the plunger in conjunction with each other, and the control becomes complicated. As described above, the technique for appropriately ejecting fluid containing particles is different from the technique for properly ejecting fluid not containing particles. This invention is made | formed in view of such a situation, and makes it a subject to provide the fluid discharge apparatus which can discharge appropriately the fluid containing a particle | grain, and the fluid which does not contain a particle | grain.

  In order to solve the above problem, a fluid discharge device according to claim 1 of the present application includes a fluid chamber, a discharge hole that communicates with the fluid chamber and discharges fluid, and the discharge hole that functions as a valve seat A plunger that moves in the fluid chamber toward the opening to the fluid chamber, a delivery device that sends the fluid into the fluid chamber, and a control device that controls the operation of the delivery device. Thus, in the fluid discharge device that discharges fluid from the discharge hole, the control device causes the plunger to move until the tip of the plunger contacts the valve seat, whereby fluid is discharged from the discharge hole. In this case, the first delivery device controller that constantly delivers fluid by the delivery device and the plunger move so that the tip of the plunger does not abut against the valve seat, so that the fluid is discharged from the discharge hole. When they are is discharged by the delivery device, and having a second delivery device controller for sending the combined fluid to the timing of movement of the plunger.

  Further, in the fluid ejection device according to claim 2, in the fluid ejection device according to claim 1, the second delivery device control unit changes the fluid delivery timing according to the characteristics of the fluid. It is characterized by.

Further, in the fluid ejection device according to claim 3, in the fluid ejection device according to claim 1 or 2, the control device is stored in the storage unit that stores the characteristics of the fluid and the storage unit. And a selection unit that selects whether to control the operation of the delivery device by which of the first delivery device control unit and the second delivery device control unit based on the characteristics of the fluid that is present. Features.
Further, in the fluid ejection device according to claim 4, in the fluid ejection device according to claim 1 or 2, the plunger has an enlarged diameter portion located above the tip portion, and the plunger is inserted. A first discharge nozzle member having a through hole formed therein, the fluid chamber and the discharge hole, a through hole having a stepped surface through which the plunger is inserted, and a second discharge formed with the fluid chamber and the discharge hole. A nozzle member, and a body member to which the first and second discharge nozzle members are detachably mounted. When the first discharge nozzle member is mounted, the plunger is disposed at the tip of the valve seat. The distal end of the plunger can be moved until it abuts, and when the delivery device is controlled by the first delivery device control unit, and when the second discharge nozzle member is mounted. Immediately before coming into contact with the seat, the enlarged diameter portion of the plunger collides with the stepped surface to stop the advance movement of the plunger, and the delivery device is controlled by the second delivery device control unit. And

  In the fluid discharge device of the present invention, when the fluid is discharged by bringing the tip of the plunger into contact with the opening of the discharge hole and discharging the fluid, the fluid is constantly sent out to the fluid chamber. On the other hand, when the fluid is discharged without bringing the tip of the plunger into contact with the opening of the discharge hole, the fluid is sent out in accordance with the timing of movement of the plunger. As a result, the tip of the plunger is brought into contact with the opening of the discharge hole to discharge the fluid containing no particles, and the fluid containing the particles is discharged without bringing the tip of the plunger into contact with the opening of the discharge hole. It becomes possible. Therefore, according to the fluid discharge device of the first aspect, it is possible to appropriately discharge a fluid containing particles and a fluid not containing particles.

  In the fluid ejection device of the present invention, the fluid delivery timing is changed according to the fluid characteristics. For example, when the viscosity of the fluid is high, the speed at which the fluid is delivered to the fluid chamber is low. For this reason, when the plunger moves, the fluid chamber is not sufficiently filled, and there is a possibility that appropriate discharge cannot be performed. For this reason, for example, the higher the viscosity of the viscous fluid, the earlier the operation start timing of the delivery device, thereby increasing the fluid filling amount in the fluid chamber when the plunger is moved. Thereby, it becomes possible to perform appropriate discharge irrespective of characteristics, such as a viscosity of a fluid.

  In the fluid ejection device of the present invention, information relating to the characteristics of the fluid is stored. And based on the memorized information, the mode in which the tip of the plunger is brought into contact with the opening of the discharge hole and the fluid is discharged, and the fluid is produced without bringing the tip of the plunger into contact with the opening of the discharge hole. One of the modes for discharging the ink is selected. The information on the characteristics of the fluid includes information on the presence or absence of fluid particles, information on the diameter of the particles, and the like. For this reason, it is possible to determine whether or not particles are included in the fluid to be used based on the information. When it is determined that the fluid to be used does not contain particles, it is possible to select a mode in which the fluid is discharged by bringing the tip of the plunger into contact with the opening of the discharge hole. On the other hand, when it is determined that the fluid to be used contains particles, it is possible to select a mode in which the fluid is discharged without bringing the tip of the plunger into contact with the opening of the discharge hole. . This eliminates the need to investigate the characteristics of the viscous fluid used and improves convenience. In addition, it is possible to prevent an operator from making a mistake in selecting the discharge mode.

It is a top view which shows the fluid application machine which is an Example of this invention. It is sectional drawing of the dispenser head with which the 1st discharge nozzle was mounted | worn. It is a block diagram which shows the control apparatus with which a fluid application machine is provided. It is a figure which shows the dispenser head shown in FIG. 2 in the state which the plunger moved below. It is sectional drawing of a 2nd discharge nozzle. It is sectional drawing of the dispenser head with which the 2nd discharge nozzle was mounted | worn. It is a figure which shows the dispenser head shown in FIG. 6 in the state which the plunger moved below.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as modes for carrying out the present invention.

<Configuration of mounting system>
FIG. 1 shows a fluid applicator 10 according to an embodiment of the present invention. The fluid applicator 10 is a working machine for applying a viscous fluid such as an adhesive or a solder paste on a circuit board. The fluid applicator 10 includes a transport device 20, a dispenser head 22, and a dispenser head moving device (hereinafter, sometimes abbreviated as “moving device”) 24.

  The transport device 20 includes a pair of conveyor belts 30 extending in the X-axis direction, and an electromagnetic motor (see FIG. 3) 32 that rotates the conveyor belt 30. The circuit board 34 is supported by the pair of conveyor belts 30 and is conveyed in the X-axis direction by driving the electromagnetic motor 32. Further, the transfer device 20 has a substrate holding device 36. The substrate holding device 36 fixedly holds the circuit board 34 supported by the conveyor belt 30 at a predetermined position (a position where the circuit board 34 in FIG. 1 is illustrated).

  The moving device 24 includes an X-axis direction slide mechanism 50 and a Y-axis direction slide mechanism 52. The X-axis direction slide mechanism 50 has an X-axis slider 56 provided on the base 54 so as to be movable in the X-axis direction. The X-axis slider 56 is moved to an arbitrary position in the X-axis direction by driving an electromagnetic motor (see FIG. 3) 58. The Y-axis direction slide mechanism 52 has a Y-axis slider 60 provided on the side surface of the X-axis slider 56 so as to be movable in the Y-axis direction. The Y-axis slider 60 is moved to an arbitrary position in the Y-axis direction by driving an electromagnetic motor (see FIG. 5) 62. A dispenser head 22 is attached to the Y-axis slider 60. With such a structure, the dispenser head 22 is moved to an arbitrary position on the base 54 by the moving device 24.

  The dispenser head 22 is a working head for discharging viscous fluid and applying the viscous fluid onto the circuit board. As shown in FIG. 2, the dispenser head 22 includes a head main body 70, a discharge nozzle 72, a plunger 73, a viscous fluid delivery device (hereinafter sometimes abbreviated as “delivery device”) 74, and an air supply device 76. And have.

  The head main body 70 is generally cylindrical and has a through hole 78 extending in the vertical direction. The through hole 78 is divided into a first inner diameter portion 80, a second inner diameter portion 82, a third inner diameter portion 84, and a fourth inner diameter portion 86. The first inner diameter portion 80 opens at the upper end surface of the head body 70. The second inner diameter portion 82 is continuous with the lower end of the first inner diameter portion 80 and has an inner diameter larger than the inner diameter of the first inner diameter portion 80. The third inner diameter portion 84 is continuous with the lower end of the second inner diameter portion 82 and has an inner diameter larger than the inner diameter of the second inner diameter portion 82. The fourth inner diameter portion 86 is continuous with the lower end of the third inner diameter portion 84 and has an inner diameter smaller than the inner diameter of the third inner diameter portion 84. The fourth inner diameter portion 86 opens at the lower end surface of the head main body 70.

  A discharge nozzle 72 is attached to the lower end surface of the head body 70. A fluid chamber 88 is formed inside the discharge nozzle 72, and the lower end of the fluid chamber 88 has a taper shape. That is, the lower end portion of the fluid chamber 88 has a mortar shape whose diameter gradually decreases. At the center of the lower end of the taper-like fluid chamber 88, the upper end of the discharge hole 92 is opened. On the other hand, the lower end of the discharge hole 92 opens to the lower end surface of the discharge nozzle 72 to form a discharge port. The discharge nozzle 72 can be attached to and detached from the lower end surface of the head main body 70.

  In addition, a through-hole 96 that opens to the upper surface of the fluid chamber 88 and the upper end surface of the head body 70 is formed inside the discharge nozzle 72. The through hole 96 is divided into a first inner diameter portion 98 that opens to the upper end surface of the head body 70 and a second inner diameter portion 100 that opens to the upper surface of the fluid chamber 88. The inner diameter of the first inner diameter portion 98 is the same as the inner diameter of the fourth inner diameter portion 86 of the through hole 78. The discharge nozzle 72 is attached to the lower end surface of the head main body 70 so that the first inner diameter portion 98 of the through hole 96 and the fourth inner diameter portion 86 of the through hole 78 communicate with each other. The inner diameter of the second inner diameter portion 100 is formed smaller than the inner diameter of the first inner diameter portion 98. The through hole 78, the through hole 96, and the discharge hole 92 are formed on one axis.

  In addition, a plunger 73 is inserted into the through hole 78 and the through hole 96, and the inside of the through hole 78 and the through hole can be moved in the vertical direction. Specifically, the plunger 73 has a stepped shape and is divided into a first outer diameter portion 102, a second outer diameter portion 104, a third outer diameter portion 106, and a fourth outer diameter portion 108. . The first outer diameter portion 102 is the upper end portion of the plunger 73. The outer diameter of the first outer diameter portion 102 is smaller than the inner diameter of the second inner diameter portion 82 of the through hole 78, and the first outer diameter portion 102 is inserted into the second inner diameter portion 82. The second outer diameter portion 104 is a portion that is continuous with the lower end of the first outer diameter portion 102. The outer diameter of the second outer diameter portion 104 is slightly smaller than the inner diameter of the third inner diameter portion 84 of the through hole 78, and the second outer diameter portion 104 is inserted into the third inner diameter portion 84. That is, when the plunger 73 moves in the vertical direction, the second outer diameter portion 104 slides with the third inner diameter portion 84.

  The third outer diameter portion 106 is a portion continuous with the lower end of the second outer diameter portion 104. The outer diameter of the third outer diameter portion 106 is slightly smaller than the inner diameters of the fourth inner diameter portion 86 of the through hole 78 and the first inner diameter portion 98 of the through hole 96, and the third outer diameter portion 106 is the fourth inner diameter portion. 86 and the first inner diameter portion 98. The fourth outer diameter portion 108 is a portion that is continuous with the lower end of the third outer diameter portion 106 and is the lower end portion of the plunger 73. The outer diameter of the fourth outer diameter portion 108 is slightly smaller than the inner diameter of the second inner diameter portion 100 of the through hole 96, and the fourth outer diameter portion 108 is inserted into the second inner diameter portion 100. Thereby, the plunger 73 can be moved in the vertical direction in the through hole 78 and the through hole 96. That is, when the plunger 73 moves in the vertical direction, the third outer diameter portion 106 slides with the fourth inner diameter portion 86 and the first inner diameter portion 98. Note that the fourth outer diameter portion 108 of the plunger 73, that is, the lower end portion of the plunger 73 extends into the fluid chamber 88.

  Between the step surface 110 between the first outer diameter portion 102 and the second outer diameter portion 104 of the plunger 73 and the step surface 112 between the first inner diameter portion 80 and the second inner diameter portion 82 of the through hole 78, A coil spring 114 is provided. The plunger 73 is urged downward by the elastic force of the coil spring 114.

  The plunger 73 is urged upward by the air supplied from the air supply device 76. Specifically, the inside of the third inner diameter portion 84 of the through hole 78 is partitioned into two spaces by the second outer diameter portion 104 of the plunger 73. A pipe 118 of the air supply device 76 is connected to a space 116 (hereinafter sometimes referred to as “air chamber”) 116 located below the two spaces. As a result, air is supplied from the air supply device 76 to the air chamber 116, whereby the plunger 73 is urged upward. That is, in a state where air is supplied from the air supply device 76, the plunger 73 moves upward by the pressure of the air, and in a state where air is not supplied from the air supply device 76, the plunger 73 is moved to the coil spring 114. It moves downward by the elastic force.

  In addition, viscous fluid is delivered into the fluid chamber 88 of the discharge nozzle 72 by the delivery device 74. Specifically, the piping 118 of the delivery device 74 is connected to the fluid chamber 88. The viscous fluid is delivered into the fluid chamber 88 by the operation of the delivery device 74, and the delivery of the viscous fluid to the fluid chamber 88 is stopped by the operation of the delivery device 74 being stopped.

  A stroke amount adjustment mechanism 120 is provided at the upper end of the head body 70. The stroke amount adjusting mechanism 120 includes an adjusting rod 122 and a protrusion amount adjusting device 124. The adjustment rod 122 is inserted from the upper end of the through hole 78 of the head body 70 and protrudes into the second inner diameter portion 82 of the through hole 78. Due to the upward movement of the plunger 73, the upper end of the plunger 73 abuts on the tip of the adjustment rod 122 that protrudes into the second inner diameter portion 82. That is, the upward movement amount of the plunger 73 is limited according to the protruding amount of the adjustment rod 122. Further, the protrusion amount adjusting device 124 adjusts the protrusion amount of the adjustment rod 122. Thereby, the stroke amount adjustment mechanism 120 adjusts the amount of upward movement of the plunger 73 and adjusts the stroke amount of the plunger 73.

  The fluid applicator 10 includes a control device 130 as shown in FIG. The control device 130 includes a controller 132 and a plurality of drive circuits 134. The plurality of drive circuits 134 are connected to the electromagnetic motors 32, 58, 62, the substrate holding device 36, the delivery device 74, the air supply device 76, and the protrusion amount adjusting device 124. The controller 132 includes a CPU, a ROM, a RAM, and the like, mainly a computer, and is connected to a plurality of drive circuits 134. Thereby, the operation of the conveying device 20, the dispenser head 22, and the moving device 24 is controlled by the controller 132.

<Discharge of viscous fluid>
With the above-described configuration, the fluid applicator 10 can discharge the viscous fluid from the discharge hole 92 of the dispenser head 22 and apply the viscous fluid onto the circuit board. Specifically, the circuit board is transported to the work position in accordance with a command from the controller 132 of the control device 130, and the circuit board is fixedly held at the position. Then, the controller 132 moves the dispenser head 22 above the circuit board. At this time, the dispenser head 22 is maintained in a state where the viscous fluid is not discharged. Specifically, the air supply device 76 is not operating, and no air is supplied to the air chamber 116. Therefore, the plunger 73 is moved downward by the elastic force of the coil spring 114 as shown in FIG. As a result, the distal end portion of the plunger 73 abuts on the lower end surface of the fluid chamber 88 which is tapered, and closes the opening 136 of the discharge hole 92 into the fluid chamber 88. Note that the tip of the plunger 73 is hemispherical and is in close contact with the opening 136 that functions as a valve seat.

  In addition, since the opening 136 of the discharge hole 92 is blocked by the tip of the plunger 73, the fluid chamber 88 is in a sealed state. For this reason, the viscous fluid is constantly delivered to the sealed fluid chamber 88 by the delivery device 74. Thereby, the fluid chamber 88 is always filled with the viscous fluid. Thus, in the dispenser head 22, the fluid chamber 88 is filled with the viscous fluid, but the opening 136 of the discharge hole 92 is blocked, thereby preventing the viscous fluid from flowing out from the discharge hole 92.

  Then, the air is supplied to the air chamber 116 by the air supply device 76, so that the plunger 73 moves upward. Thereby, the opening 136 of the discharge hole 92 is opened. Incidentally, when the opening 136 is opened, the viscous fluid may drop from the discharge hole 92 due to its own weight and the delivery of the viscous fluid by the delivery device 74.

  After the plunger 73 moves upward, the supply of air to the air chamber 116 is stopped. As a result, the plunger 73 moves downward by the elastic force of the coil spring 114. That is, the distal end portion of the plunger 73 moves toward the opening 136 of the discharge hole 92. By the movement of the plunger 73, the viscous fluid to which an inertial force is applied is discharged from the discharge hole 92, and the viscous fluid is applied onto the circuit board. Then, the downward movement of the plunger 73 is stopped when the distal end portion of the plunger 73 comes into contact with the opening 136 of the discharge hole 92. At this time, the opening 136 of the discharge hole 92 is blocked by the distal end portion of the plunger 73, whereby the discharge of the viscous fluid is stopped.

  As described above, in the dispenser head 22, the plunger 73 moves until the tip of the plunger 73 comes into contact with the opening 136 of the discharge hole 92, thereby discharging the viscous fluid. As a result, the opening 136 of the discharge hole 92 is closed along with the end of the discharge of the viscous fluid, so that it is possible to appropriately prevent liquid dripping at the time of non-discharge. However, when the viscous fluid contains particles of solder, silver, or the like, that is, when it is a solder paste, silver paste, or the like, when the tip of the plunger 73 comes into contact with the opening 136 of the discharge hole 92 during discharge. In addition, there is a risk that particles such as solder may be crushed. Then, the crushed particles may adhere to the discharge hole 92 (clogging occurs in the worst case) and the viscous fluid may not be discharged properly.

  In view of the above, in the dispenser head 22, when the viscous fluid having particles is discharged, the plunger 73 moves to the vicinity of the opening 136 so that the tip portion thereof does not contact the opening 136 of the discharge hole 92. In this way, an inertial force is applied to the viscous fluid, and discharge is performed. Specifically, the discharge nozzle 72 is removed from the head main body 70 of the dispenser head 22, and the discharge nozzle 140 shown in FIG. In order to distinguish between the discharge nozzle 72 and the discharge nozzle 140, the discharge nozzle 72 may be referred to as the first discharge nozzle 72 and the discharge nozzle 140 may be referred to as the second discharge nozzle 140.

  The second discharge nozzle 140 has the same configuration as the first discharge nozzle 72 except for the through hole 142 opened on the upper surface thereof. For this reason, the same reference numerals as those of the first discharge nozzle 72 are used for components having the same functions as those of the first discharge nozzle 72. Similar to the through hole 96 of the first discharge nozzle 72, the through hole 142 of the second discharge nozzle 140 has a first inner diameter portion 144 that opens to the upper end surface of the second discharge nozzle 140 and a second hole that opens to the fluid chamber 88. It is divided into an inner diameter part 146.

  The inner diameter of the first inner diameter portion 144 is the same as the inner diameter of the first inner diameter portion 98 of the through hole 96 of the first discharge nozzle 72, and the inner diameter of the second inner diameter portion 146 is the through hole of the first discharge nozzle 72. The inner diameter of the 96 second inner diameter portion 100 is the same. As a result, as shown in FIG. 6, when the second discharge nozzle 140 is attached to the head main body 70, the plunger 73 is inserted into the through hole 142, and the distal end portion of the plunger 73 extends into the fluid chamber 88. .

  However, the vertical length of the first inner diameter portion 144 is shorter than the vertical length of the first inner diameter portion 98 of the first discharge nozzle 72. That is, the step surface 148 between the first inner diameter portion 144 and the second inner diameter portion 146 is located above the step surface between the first inner diameter portion 98 and the second inner diameter portion 100 of the first discharge nozzle 72. For this reason, as shown in FIG. 7, when the plunger 73 moves downward, the step surface 150 between the third outer diameter portion 106 and the fourth outer diameter portion 108 of the plunger 73 becomes the step surface 148 of the through hole 142. Abut. Thereby, in the dispenser head 22 to which the second discharge nozzle 140 is attached, even if the plunger 73 moves downward, the distal end portion of the plunger 73 does not contact the opening 136 of the discharge hole 92. That is, the viscous fluid can be discharged without bringing the distal end portion of the plunger 73 into contact with the opening 136 of the discharge hole 92.

  The dispenser head 22 to which the second discharge nozzle 140 is attached controls not only the movement of the plunger 73 but also the delivery of the viscous fluid to the fluid chamber 88 at the time of viscous fluid discharge. That is, the operations of the delivery device 74 and the air supply device 76 are controlled. Specifically, in the dispenser head 22 to which the second discharge nozzle 140 is attached, the fluid chamber 88 is not sealed because the opening 136 of the discharge hole 92 is not blocked by the tip of the plunger 73. For this reason, at the time of non-ejection, the delivery of the viscous fluid to the fluid chamber 88 by the delivery device 74 is prohibited. Thereby, dripping of the viscous fluid at the time of non-ejection is prevented.

  On the other hand, at the time of discharge, air is supplied to the air chamber 116 by the air supply device 76, the plunger 73 moves upward, and the plunger 73 moves downward by stopping the supply of air. The viscous fluid is delivered by the delivery device 74 in accordance with the movement timing of the plunger 73. That is, at the time of discharging the viscous fluid, the viscous fluid is sent to the fluid chamber 88 in accordance with the movement timing of the plunger 73. Thereby, the viscous fluid delivered to the fluid chamber 88 is discharged from the discharge hole 92 as the plunger 73 moves. The delivery device 74 stops its operation after delivering a predetermined amount of viscous fluid. As described above, in the dispenser head 22 to which the second discharge nozzle 140 is attached, a predetermined amount of viscous fluid is discharged without bringing the tip end of the plunger 73 into contact with the opening 136 of the discharge hole 92. As a result, it is possible to appropriately discharge the solder paste or the like without crushing the solder or the like.

  On the other hand, when discharging a viscous fluid that does not contain particles, for example, adhesive, flux, etc., it is not necessary to consider the collapse of the particles, so the dispenser head 22 equipped with the first discharge nozzle 72 is used. Is possible. In the dispenser head 22 to which the first discharge nozzle 72 is attached, it is not necessary to control the operation of the delivery device 74, and viscous fluid can be discharged by relatively simple control. Further, since the fluid chamber 88 is always filled with the viscous fluid, it is possible to discharge with good response. As described above, the dispenser head 22 can appropriately discharge the viscous fluid regardless of the presence or absence of particles by exchanging the nozzles and changing the operation mode of the delivery device 74 according to the nozzles.

  Further, in the dispenser head 22 to which the second discharge nozzle 140 is attached, when the delivery device 74 is operated in accordance with the movement timing of the plunger 73, the operation timing of the delivery device 74 is set according to the characteristics of the viscous fluid. It has changed. Specifically, for example, when the viscosity of the viscous fluid is high, the speed at which the viscous fluid is delivered to the fluid chamber 88 is low. For this reason, when the plunger 73 moves, the fluid fluid 88 is not sufficiently filled in the fluid chamber 88, and there is a possibility that proper discharge cannot be performed. In view of the above, the higher the viscosity of the viscous fluid, the earlier the operation start timing of the delivery device 74.

  Specifically, the fluid applicator 10 is provided with an input device (not shown) for inputting the type of viscous fluid. Further, the controller 132 of the control device 130 stores information on characteristics such as the viscosity of various viscous fluids. Then, the controller 132 searches for the viscosity according to the type of the input viscous fluid, and calculates the operation start timing of the delivery device 74 according to the viscosity. Thereby, even if it is a viscous fluid with a high viscosity, it becomes possible to fully fill the fluid chamber 88 with the viscous fluid when the plunger 73 moves, and it becomes possible to perform appropriate discharge.

  Further, the information related to the characteristics of the viscous fluid stored in the controller 132 includes information related to the presence / absence of particles of the viscous fluid and information related to the diameter of the particles. Based on this information, the fluid applicator 10 selects a discharge mode using the first discharge nozzle 72 and a discharge mode using the second discharge nozzle 140. Specifically, when the type of viscous fluid to be used is input to the input device, the controller 132 determines whether particles are included in the input viscous fluid. If it is determined that particles are not included, a discharge mode using the first discharge nozzle 72 is selected. On the other hand, when it is determined that particles are included, a discharge mode using the second discharge nozzle 140 is selected. The controller 132 displays a nozzle corresponding to the selected discharge mode on a display device (not shown), and controls the operation of the delivery device 74 according to the selected discharge mode. This eliminates the need to investigate the characteristics of the viscous fluid used and improves convenience. In addition, it is possible to prevent a mistake in selecting the discharge mode by the operator, for example, a mistake of discharging the solder paste or the like by the first discharge nozzle 72. Note that, when the controller 132 determines that the viscous fluid contains particles and the particle diameter is smaller than the threshold value, the discharge mode using the first discharge nozzle 72 may be selected. This is because even if small particles are crushed, the possibility that the crushed particles block the discharge hole 92 is low.

  As shown in FIG. 3, the controller 132 includes a first discharge control execution unit 160, a second discharge control execution unit 162, a storage unit 164, and a selection unit 166. The first discharge control execution unit 160 is a functional unit that controls the operation of the delivery device 74 in accordance with the discharge mode using the first discharge nozzle 72. The second discharge control execution unit 162 is a functional unit that controls the operation of the delivery device 74 according to the discharge mode using the second discharge nozzle 140. The storage unit 164 is a functional unit that stores characteristics such as the viscosity of the viscous fluid, the presence / absence of particles, and the diameter of the particles. The selection unit 166 is a functional unit that selects a discharge mode using the first discharge nozzle 72 and a discharge mode using the second discharge nozzle 140 based on the characteristics of the viscous fluid. Further, the second discharge control execution unit 162 includes a discharge timing changing unit 168. The discharge timing changing unit 168 is a functional unit that changes the operation timing of the delivery device 74 based on the characteristics of the viscous fluid.

  Incidentally, in the above-described embodiment, the dispenser head 22 is an example of a fluid ejection device. The plunger 73, the delivery device 74, the fluid chamber 88, and the discharge hole 92 constituting the dispenser head 22 are examples of the plunger, the delivery device, the fluid chamber, and the discharge hole. The control device 130 is an example of a control device. The first discharge control execution unit 160, the second discharge control execution unit 162, the storage unit 164, and the selection unit 166 constituting the control device 130 are a first delivery device control unit, a second delivery device control unit, a storage unit, and a selection unit. It is an example.

  In addition, this invention is not limited to the said Example, It is possible to implement in the various aspect which gave various change and improvement based on the knowledge of those skilled in the art. Specifically, for example, in the above embodiment, the mode in which the tip end of the plunger is brought into contact with the mode in which the plunger is not brought into contact is switched by exchanging the nozzle, but the two modes are switched by various methods. Is possible. Specifically, for example, the two modes can be switched by moving the plunger by a drive source such as a motor and changing the stop position of the plunger by control of the drive source. Further, for example, it is possible to switch between the two modes by providing a mechanism capable of adjusting the downward movement amount of the plunger and adjusting the downward movement amount of the plunger by the mechanism.

  22: Dispenser head (fluid discharge device) 73: Plunger 74: Delivery device 88: Fluid chamber 92: Discharge hole 130: Control device 160: First discharge control execution unit (first delivery device control unit) 162: Second discharge control Execution unit (second sending device control unit) 164: storage unit 166: selection unit

Claims (4)

A fluid chamber;
A discharge hole that communicates with the fluid chamber and discharges the fluid;
A plunger that moves in the fluid chamber toward an opening to the fluid chamber of the discharge hole that functions as a valve seat;
A delivery device for delivering fluid into the fluid chamber;
A fluid discharge device that discharges fluid from the discharge hole by the advance movement of the plunger.
The control device is
A first delivery device controller that constantly delivers fluid by the delivery device when the fluid is ejected from the ejection hole by moving the plunger until its tip abuts against the valve seat; ,
When the fluid is discharged from the discharge hole by moving the plunger so that the tip of the plunger does not contact the valve seat, the fluid is sent to the timing of movement of the plunger by the delivery device. A fluid delivery device comprising: a second delivery device control unit for delivering the fluid together. The second delivery device control unit
The fluid ejection device according to claim 1, wherein the fluid delivery timing is changed according to the characteristics of the fluid. The control device is
A storage unit for storing the characteristics of the fluid;
Based on the characteristics of the fluid stored in the storage unit, it is selected which of the first delivery device control unit and the second delivery device control unit controls the operation of the delivery device. The fluid ejection device according to claim 1, further comprising: a selection unit. The plunger has an enlarged diameter portion located above the tip;
A first discharge nozzle member in which the through hole through which the plunger is inserted, the fluid chamber, and the discharge hole are formed;
A through hole having a step surface through which the plunger is inserted, the fluid chamber, and a second discharge nozzle member in which the discharge hole is formed;
A main body member on which the first and second discharge nozzle members are detachably mounted;
When the first discharge nozzle member is mounted, the plunger can move until the tip of the plunger contacts the valve seat, and the delivery device is controlled by the first delivery device control unit. about,
At the time of mounting the second discharge nozzle member, immediately before the distal end portion of the plunger comes into contact with the valve seat, the expanded diameter portion of the plunger collides with the stepped surface, and the advance movement of the plunger is stopped, and The fluid ejection device according to claim 1, wherein the delivery device is controlled by the second delivery device control unit.