JP2013071068A - Apparatus for coating high viscosity fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid coating failure caused by detecting contact with a nozzle and a work in the coating work as much as possible.SOLUTION: The high viscosity fluid coating apparatus includes at least a nozzle 12 capable of discharging a high viscosity fluid. The nozzle 12 includes a cylinder portion 16, a gap forming portion 18 which is arranged in the inner periphery of the cylinder portion 16 and forms a gap 17 between the discharge side 16a of the cylinder portion 16 and this cylinder portion, and a coupling portion 20 which couples the cylinder portion 16 and the gap forming portion 18 through an insulator 19. Furthermore, the apparatus includes an electric resistance detecting means 14 for detecting electric resistance provided between the cylinder portion 16 and the gap forming portion 18.

Description

  The present invention relates to a high-viscosity fluid application apparatus for discharging a high-viscosity fluid such as a sealer or an adhesive from a nozzle and applying it to a predetermined position of a work, and in particular, has a structure capable of detecting contact between the nozzle and the work. The present invention relates to a coating apparatus.

  For example, a panel member constituting an automobile door is formed by superposing an outer panel and an inner panel, folding back the outer peripheral portion of the outer panel by a bending process called a hemming process, and integrating these inner and outer panels. In this case, in the folded portion called a hem portion, a sealer is applied to the folded portion (or the region that becomes the folded portion) at any stage before or after the hemming process in order to prevent intrusion of rainwater or the like. .

  This type of coating operation is usually performed using a multi-axis robot arm that can hold a nozzle. In this case, the nozzle held by the robot arm can be accurately moved on the coating target area of the sealer. In addition, an operation called teaching is performed in advance. By this operation, the distance between the nozzle tip and the workpiece is kept constant.

Here, as a means for appropriately controlling the distance between the nozzle tip and the workpiece, for example, in Patent Document 1 below, a guide tip is provided at the tip of a guide plate extending in parallel with a nozzle capable of discharging a sealer. The guide chip detects the presence or absence of energization when the conductor part of the required width comes into contact with the edge of the workpiece, and appropriately controls the distance in the X-axis (longitudinal axis) direction of the nozzle relative to the workpiece using this detection signal. A sealer coating apparatus provided with a controller is disclosed.

Japanese Utility Model Publication No. 7-31166

  By the way, in order to obtain a stable coating state (sealer coating width, coating area, coating thickness, etc.), the nozzle needs to be as close to the workpiece as possible, but if it is too close, variations in workpiece dimensions and workpiece set position will occur. As a result, the nozzle and the workpiece come into contact with each other, and the nozzle may be damaged. In this case, even if teaching is performed in advance and the nozzle is operated as set, it is difficult to stably perform a predetermined quality coating operation.

  The coating apparatus described in the above-mentioned Patent Document 1 makes the conductor part of the guide tip contact the edge of the work and controls the distance between the nozzle and the work on the basis of the contact position. When the positional relationship between the edge and the workpiece surface to be coated is different from the designed relationship (for example, the edge is positioned above a predetermined position), it cannot be handled. Further, in this case, since it is impossible to detect that the tip of the nozzle is deformed or damaged, the coating operation is continued with the tip of the nozzle being deformed, which may cause a coating failure. This further requires a work of wiping off the sealer and a work of recoating, resulting in an increase in man-hours.

  The above-mentioned problems are not limited to the application work of the sealer. For example, when trying to apply a high-viscosity fluid, such as an adhesive, to the surface of the workpiece accurately and stably, there are concerns about the same problems as described above. Is done.

  In view of the above circumstances, it is a technical problem to be solved by the present invention to detect contact between a nozzle and a workpiece during a coating operation and to avoid as much as possible a coating defect caused by this.

  The solution to the above problem is achieved by the high viscosity fluid coating apparatus according to the present invention. That is, this coating apparatus is a high-viscosity fluid coating apparatus having a nozzle capable of discharging a high-viscosity fluid, and the nozzle is disposed between the cylindrical portion and the discharge side of the cylindrical portion. An electric resistance detection means configured to include a gap forming part that forms a gap and a connecting part that connects the cylinder part and the gap forming part via an insulator, and detects an electric resistance between the cylinder part and the gap forming part. It is characterized by the point further equipped with.

  The coating apparatus according to the present invention includes a cylinder part, a gap forming part that is provided on the inner periphery of the cylinder part and forms a gap between the discharge side of the cylinder part, and the cylinder part and the gap forming part via an insulator. The connecting portion for connecting the two and the nozzle constitutes a nozzle, and further comprises an electric resistance detecting means for detecting an electric resistance between the cylindrical portion and the gap forming portion. According to the coating apparatus according to this configuration, when the high-viscosity fluid is normally applied from the nozzle, that is, when the cylinder part mainly constituting the discharge side of the nozzle is not in contact with the workpiece, the discharge side of the nozzle Thus, the gap formed between the tube portion and the gap forming portion is maintained. Moreover, since the cylinder part and the gap forming part are connected via an insulator, the electrical resistance between the two parts detected by the electrical resistance detection means at this time is very large. On the other hand, when an abnormality occurs in the nozzle, that is, when the cylindrical portion deforms in contact with the workpiece, the discharge side of the cylindrical portion comes into contact with the gap forming portion depending on the degree of deformation. At this time, the electrical resistance between the cylindrical portion and the gap forming portion detected by the electrical resistance detecting means is smaller than that in the normal state. Therefore, by monitoring the value of the electrical resistance, it is possible to reliably determine whether or not the nozzle (cylinder part) is deformed without visual observation. In addition, since the monitoring of the electric resistance value can be easily performed even during the coating operation, monitoring is performed during the coating operation when an abnormality occurs (when a deformation occurs in the nozzle cylinder). The application work can be stopped. As a result, it is possible to avoid the occurrence of coating failure by continuing the coating operation with the nozzle still deformed, thereby preventing the deterioration of the coating quality and improving the work efficiency by reducing unnecessary work such as re-application. Can be achieved.

  The high-viscosity fluid application apparatus according to the present invention may further include a control unit that controls the discharge operation of the high-viscosity fluid based on the value of the electrical resistance detected by the electrical resistance detection unit. Further, in this case, the control means, when the value of the electric resistance detected by the electric resistance detection means when the cylindrical portion and the gap forming portion are in contact with each other due to the deformation of the cylindrical portion is lower than a preset threshold value. Further, the discharge operation of the high viscosity fluid may be stopped.

  If the control means having the above-described configuration is provided, the application operation can be automatically stopped when the abnormality of the nozzle occurs (at the time of deformation) without the operator constantly monitoring. In addition, when determining whether or not the nozzle is deformed based on the change in electrical resistance, it is possible to always determine whether or not the nozzle is deformed based on a certain criterion by setting a certain criterion (threshold). Thereby, the reliability of the control means is improved.

  As described above, according to the present invention, it is possible to detect the contact between the nozzle and the workpiece during the coating operation, and to avoid as much as possible the coating failure caused by this.

It is a perspective view showing the whole high viscosity fluid application device composition concerning one embodiment of the present invention. It is the side view which looked at the nozzle of the coating device shown in FIG. 1 from the discharge port side. It is AA sectional drawing of the nozzle shown in FIG. It is sectional drawing for demonstrating the effect | action of the coating device which concerns on this invention when a nozzle front-end | tip contacts and deform | transforms a workpiece | work. It is a principal part perspective view for demonstrating the behavior of the sealer at the time of apply | coating a sealer using the coating device shown in FIG. It is a principal part perspective view for demonstrating the behavior of the sealer at the time of apply | coating a sealer using the coating device shown in FIG. It is principal part sectional drawing of the coating device which concerns on other embodiment of this invention.

  Hereinafter, an embodiment of a high-viscosity fluid coating apparatus according to the present invention will be described with reference to FIGS. In this embodiment, a case where a sealer as a high-viscosity fluid is applied to an outer panel peripheral end portion of an automobile door will be described as an example.

  FIG. 1 is a perspective view showing an overall configuration of a high-viscosity fluid coating apparatus 10 according to an embodiment of the present invention. As shown in the figure, this coating apparatus 10 holds a sealer supply unit 11 that can supply a sealer as a high-viscosity fluid, a nozzle 12 that can discharge a sealer supplied from the sealer supply unit 11, and a nozzle 12. Then, a robot arm 13 capable of moving the tip of the nozzle 12 to a predetermined position, an electric resistance detecting means 14 connected to a predetermined position of the nozzle 12 to be described later, and detecting an electric resistance between the two connected positions, and an electric resistance Based on the value of the electrical resistance detected by the detection means 14, a control means 15 for controlling the operation of the sealer supply unit 11 and the robot arm 13 is provided. Hereinafter, the structure and usage of the nozzle 12 that are deeply related to the present invention will be described.

  As shown in FIGS. 2 and 3, the nozzle 12 includes a gap forming portion 18 that forms a gap 17 between the cylindrical portion 16 and the discharge side 16 a of the cylindrical portion 16 disposed on the inner periphery of the cylindrical portion 16. The connecting portion 20 connects the cylindrical portion 16 and the gap forming portion 18 via the insulator 19. In this embodiment, the cylinder part 16 has a cylindrical shape. As shown in FIG. 3, the gap forming portion 18 has a substantially columnar shape, and a part of the discharge side is inserted into the inner periphery of the cylindrical portion 16. In this case, the gap 17 formed between the discharge side 16a of the cylindrical portion 16 and the gap forming portion 18 is annular, and has a constant width direction dimension on the entire circumference. Note that the size of the gap 17 is an appropriate size in anticipation of the degree of deformation of the cylindrical portion 16 caused by the tip of the nozzle 12 coming into contact with the workpiece during the movement operation of the nozzle 12 performed by the robot arm 13, for example. Is set.

  In this embodiment, the connecting portion 20 fits the fitting portion 20a provided on the inner periphery on the proximal end side of the cylindrical portion 16 and the fitting portion 20b provided on the outer periphery on the proximal end side of the gap forming portion 18. Is formed. In this embodiment, as shown in FIG. 3, after an insulator 19 such as a resin is formed on one of the fitting portions 20a and 20b including a female screw portion and a male screw portion in advance, both fitting portions are formed. By fitting 20a and 20b, the connection part 20 is formed, and the cylinder part 16 and the clearance gap formation part 18 are connected via the insulator 19. FIG. At the stage where the assembly is performed in this way, the cylindrical portion 16 and the gap forming portion 18 are in contact with each other only via the insulator 19 and are thus electrically insulated. In this case, the cylindrical portion 16 and the gap forming portion 18 are both formed separately from a conductive material (for example, metal) for the reason described later.

  Moreover, in this embodiment, the introduction path 21 of the sealer is formed in the gap forming part 18, and the sealer supply part 11 is connected to the base end side (see FIG. 1). The discharge-side end portion of the introduction path 21 opens to the outer periphery of the gap forming portion 18. In addition, in this embodiment, since the discharge port 22 is formed at the discharge side end portion of the gap 17 between the cylinder portion 16 and the gap forming portion 18, the sealer supplied from the sealer supply portion 11 to the nozzle 12 Is discharged from the discharge port 22 to the outside of the nozzle 12 through the introduction path 21 and further through the gap 17. Note that, on the outer peripheral surface of the gap forming portion 18, a diameter-expanded surface 18 a that increases in diameter toward the discharge side is formed on the discharge side in the axial direction from the opening 21 a of the introduction path 21. Serves to guide the sealer to the gap 17 formed between the discharge side 16 a of the cylinder part 16 and the gap forming part 18.

  The electrical resistance detection means 14 is electrically connected to a cylindrical portion 16 that mainly constitutes the discharge side outside of the nozzle 12 and a gap forming portion 18 disposed on the discharge side inner periphery of the cylindrical portion 16. In this embodiment, as shown in FIG. 3, the outer peripheral surface of the cylindrical portion 16 and the outer peripheral surface on the base end side constituting the outer peripheral surface of the nozzle 12 in the gap forming portion 18 (the surface not covered by the cylindrical portion 16). ) Is electrically connected to the electrical resistance detecting means 14. Then, by energizing in such a connected state, the electrical resistance between the tube portion 16 and the gap forming portion 18 can be detected.

  The control unit 15 is electrically connected to the electrical resistance detection unit 14 and can instruct the sealer supply unit 11 to execute or stop the sealer supply operation based on the value of the electrical resistance detected by the electrical resistance detection unit 14. Yes. In addition, the robot arm 13 can be instructed to execute or stop the nozzle 12 moving operation. Specifically, a threshold value relating to the value of the electric signal detected in advance is determined, and if the actually detected electric resistance value is equal to or greater than the threshold value, the sealer supply unit 11 is supplied with the sealer. An operation execution instruction is given, and an instruction to move the nozzle 12 is given to the robot arm 13. When the actually detected electrical resistance value is less than the threshold value, the sealer supply unit 11 is instructed to stop the sealer supply operation, and the nozzle 12 is moved to the robot arm 13. An instruction to stop the operation is given.

  Hereinafter, the behavior of the nozzle when the sealer is applied using the high-viscosity fluid application apparatus 10 having the above-described configuration and the operation of the high-viscosity fluid application apparatus 10 when the nozzle contacts the workpiece will be described.

  First, although not shown in the drawing, the nozzle 12 is arranged at a predetermined distance from the intended application area on the workpiece surface, and the sealer supplied from the sealer supply unit 11 is discharged through the discharge port 22 of the nozzle 12. In this case, since the cylindrical portion 16 that mainly forms the outside of the discharge side of the nozzle 12 does not come into contact with the work, as shown in FIG. 3, there is a gap between the cylindrical portion 16 and the gap forming portion 18 on the discharge side of the nozzle 12. The cylindrical gap 17 formed in the above is maintained. Therefore, in this state, the cylindrical portion 16 and the gap forming portion 18 are not in contact with each other except for the portion (the connecting portion 20) connected via the insulator 19, and at this time, the electric resistance detecting means 14 The value of the electrical resistance between the cylinder part 16 and the gap forming part 18 detected at 1 is very large. As a result, the control means 15 determines that the detected electric resistance value is greater than a predetermined threshold value, and instructs the sealer supply unit 11 and the robot arm 13 to continue the predetermined operation.

  On the other hand, although illustration is omitted, the nozzle 12 comes into contact with the workpiece due to variations in workpiece thickness and shape accuracy (flatness, etc.) or workpiece setting position, and the discharge side 16a of the cylindrical portion 16 bends. Alternatively, when deformation such as folding occurs, a part of the discharge side 16 a of the cylindrical portion 16 in the circumferential direction may come into contact with the gap forming portion 18 as shown in FIG. 4. In this case, since a current-carrying circuit is formed between the cylindrical portion 16, the gap forming portion 18, and the electrical resistance detection means 14 via the contact region, the detected electrical resistance value becomes very small. Here, in the control means 15, when the value of the detected electric resistance is equal to or less than the threshold value, an instruction to stop the sealer supply operation is sent to the sealer supply unit 11, and the robot arm 13 Sends an instruction to stop the movement operation of the nozzle 12. Thereby, the application | coating operation | work to the workpiece | work surface of a sealer in the state which the tip of the nozzle 12 deform | transformed or damaged is stopped.

  Thus, if it is the coating device 10 which concerns on this invention, the presence or absence of a deformation | transformation of the nozzle 12 (cylinder part 16) is visually observed by monitoring the value of the electrical resistance between the cylinder part 16 and the clearance gap formation part 18. FIG. It is possible to make a reliable determination regardless. In addition, since the control means 15 is connected to the electric resistance detection means 14 and the operations of the sealer supply unit 11 and the robot arm 13 are controlled by the control means 15 respectively, the value of the electric resistance is being applied. In addition, it is possible to monitor easily, and when an abnormality occurs (when deformation occurs in the cylindrical portion 16 of the nozzle 12), it is possible to automatically and quickly stop the coating operation. As a result, it is possible to avoid the occurrence of defective coating by continuing the coating operation while the nozzle 12 remains deformed, thereby preventing a decrease in coating quality and reducing unnecessary work such as re-application. Improvements can be made.

  Further, in this embodiment, since the discharge port 22 of the nozzle 12 is formed by the cylindrical gap 17 provided between the cylinder portion 16 and the gap forming portion 18, the high-viscosity fluid application device having the above-described configuration. When the sealer is applied using 10, the sealer discharged to the outside of the nozzle 12 exhibits the following behavior. First, as shown in FIGS. 1 and 3, the sealer supply unit 11 in a state where the nozzle 12 of the high-viscosity fluid coating apparatus 10 is inclined at a predetermined angle θ (<90 °) with respect to the surface of the workpiece W to be coated. Further, the sealer is supplied toward the nozzle 12. As a result, the sealer supplied into the nozzle 12 passes through the introduction path 21 provided in the gap forming portion 18 and is introduced into the inner circumferential space of the cylindrical portion 16 from the opening 21a, and the gap communicating with the inner circumferential space. After reaching 17, the liquid is discharged to the external space through the discharge port 22 located at the discharge side end of the gap 17. The sealer S immediately after being discharged from the nozzle 12 in this way has a shape conforming to the cross-sectional shape of the gap 17 as shown in FIG. 5, and has a shape having a hollow portion Sa at the center (so-called cylindrical shape). Presents. Then, the sealer S having a cylindrical shape (hollow shape) immediately after the discharge is flattened on the application surface of the workpiece W, as shown in FIG. It is in a state of spreading in the width direction more than immediately after discharge. That is, the sealer S ′ after a certain period of time has elapsed after discharging and is flattened by being crushed by its own weight, and is applied flatly and widely on the surface of the workpiece W.

  In this way, by forming the discharge port 22 of the nozzle 12 at the discharge side end portion of the cylindrical gap 17, a sealer having a constant width dimension regardless of the direction the tip of the nozzle 12 faces. S ′ can be applied to the surface of the workpiece W. Therefore, for example, although illustration is omitted, even when the application direction of the sealer (the movement direction of the nozzle 12 during application of the sealer) is changed halfway, the width dimension is always constant without changing the direction of the tip of the nozzle 12. It is possible to apply a flat shape sealer S ′ to the predetermined surface of the workpiece W. Therefore, when the sealer is applied to the peripheral end portion of the outer panel using the robot arm 13, it is possible to apply 360 degrees in a state where the direction of the nozzle 12 is kept constant, and the application operation is performed easily and in a short time. be able to. In addition, since the operation setting of the robot arm 13 during teaching can be easily performed, the time required for coating preparation (teaching) can be shortened. Moreover, since the operation | movement requested | required of the nozzle 12 at the time of application | coating operation | work is sufficient, a comparatively cheap general purpose robot arm can be used. Thereby, it becomes possible to suppress an increase in equipment cost while accurately applying the sealer to the surface of the workpiece W.

  As mentioned above, although one embodiment of the high-viscosity fluid coating apparatus according to the present invention has been described, this coating apparatus is not limited to the above-described exemplary form, and can take any form within the scope of the present invention. It is.

  For example, FIG. 7 shows an example, and the high-viscosity fluid coating apparatus according to this embodiment forms the discharge port 34 of the nozzle 32 at the discharge side end of the gap forming portion 38, thereby discharging the tube portion 36. 1 is different from the high-viscosity fluid coating apparatus 10 (nozzle 12 thereof) in the form shown in FIG. 1 in that a discharge port 34 is provided separately from the discharge side opening of the gap 37 formed between the side 36a and the gap forming portion 38. To do.

  More specifically, an introduction hole 36b for introducing the sealer supplied from the sealer supply part 11 into the nozzle 12 is formed on the inner peripheral proximal end side of the cylindrical part 36, and on the discharge side of the introduction hole 36b, An accommodation hole 36c that has a larger diameter than the introduction hole 36b and can accommodate the gap forming portion 38 is formed continuously with the introduction hole 36b on the inner periphery. And the fitting part 20a which comprises the connection part 20 is formed in the base end side of this accommodation hole 36c, and the clearance gap formation part 38 accommodated in the accommodation hole 36c is screwed to the fitting part 20b provided in the outer periphery. By fitting, the cylindrical portion 36 and the gap forming portion 38 are connected. In this case, as shown in FIG. 7, the insulator 19 is interposed between the fitting portions 20a and 20b, and is brought into contact with the bottom surface of the accommodation hole 36c (the surface forming the step between the introduction hole 36b and the accommodation hole 36c). The ring member 33 made of an insulator is interposed between the cylindrical portion 36 and the gap forming portion 38 in the axial direction. Further, the cylindrical portion 36 is formed with a radial hole 36d that penetrates the cylindrical portion 36 in the radial direction and communicates with the receiving hole 36c, and the electrical resistance detecting means 14 forms a gap through the radial hole 36d. In addition to being connected to the portion 38, it is connected to the cylindrical portion 36. Thereby, the cylinder part 36 and the clearance gap formation part 38 distribute | arranged to the inner periphery of the cylinder part 36 are connected only through the insulator 19 (ring member 33), and the clearance gap 37 is formed in another location etc. It is in a non-contact state. On the other hand, the sealer supplied to the inside of the nozzle 12 from the sealer supply part 11 is led out along the center of the introduction hole 36b of the cylindrical part 36, the hole 33a provided in the center of the ring member 33, and the gap forming part 38. The ink is discharged from the discharge port 34 formed at the discharge side end of the outlet path 38a to the outside of the nozzle 12 through the path 38a.

  Therefore, according to the high-viscosity fluid coating apparatus including the nozzle 32 having the structure according to this embodiment, the nozzle 32 comes into contact with the workpiece and the discharge side 36a of the cylindrical portion 36 is bent or bent as in the above-described embodiment. When deformation such as breakage occurs, the contact between the discharge side 16a of the cylindrical portion 36 and the gap forming portion 38 can be automatically detected by the electrical resistance detection means 14 and the control means 15. Therefore, the presence or absence of deformation of the nozzle 32 (cylinder portion 36) can be reliably determined without visual observation. Further, since the value of the electric resistance can be monitored even during the application operation, the application operation is automatically and immediately stopped when an abnormality occurs (when the cylindrical portion 36 of the nozzle 32 is deformed). It becomes possible.

  Also, as shown in FIG. 3, when a part of the gap 17 (end on the discharge side) is used as the discharge port 22, the shape of the discharge port 22 is limited to some extent (connected from the viewpoint of conductivity to the entire circumference). On the other hand, with the configuration shown in FIG. 7, the shape of the discharge port 34 can be freely determined without being restricted by the shape of the gap 17.

  In the above embodiment, when the control unit 15 determines that the value of the electrical resistance detected by the electrical resistance detection unit 14 is equal to or less than the threshold value, the sealer supply operation is stopped with respect to the sealer supply unit 11. In this example, an instruction to stop the movement operation of the nozzle 12 is sent to the robot arm 13, but other instructions may be sent. When it is determined that the value of the electrical resistance detected by 14 is equal to or less than the above threshold value, the control unit 15 raises the nozzle 12 by a predetermined amount and resumes the sealer application work while avoiding contact with the workpiece. It is also possible to control so as to send instructions to the sealer supply unit 11 and the robot arm 13.

  Moreover, although the case where the cross-sectional shape of the clearance gap 17 (37) was made into a perfect cylinder shape was illustrated in the above embodiment, of course, it can also take shapes other than this. A predetermined gap 17 (37) is provided between the two parts 16, 18 (36, 38) so that the cylindrical part 16 (36) and the gap forming part 18 (38) can be kept in a non-contact state except for the connecting part 20. As long as it is formed, it can take any shape.

  Moreover, in the said embodiment, although the case where the sealer as a high-viscosity fluid was apply | coated to the outer panel peripheral edge part of the door for motor vehicles was demonstrated as an example, this invention is applicable also to application | coating operations other than the above. Is possible. That is, the present invention can be applied to the case where a high-viscosity fluid other than a sealer such as an adhesive is applied, and the coating apparatus according to the present invention is applied to a region other than the peripheral end of the outer panel of an automobile door. It can be used to apply high viscosity fluids.

  Of course, other specific forms can be adopted for matters other than the above as long as the technical significance of the present invention is not lost.

DESCRIPTION OF SYMBOLS 10 High-viscosity fluid application apparatus 11 Sealer supply part 12, 32 Nozzle 13 Robot arm 14 Electrical resistance detection means 15 Control means 16, 36 Tube part 16a, 36a Discharge side 17, 37 Gap 18, 38 Gap formation part 18a Expanded surface 19 Insulator 20 Connecting portion 20a, 20b Fitting portion 21 Introducing path 21a Opening portion 22, 34 Discharge port 33 Ring member (insulator)
33a hole 36b introduction hole 36c accommodation hole 36d radial direction hole 38a lead-out path S sealer (immediately after discharge)
Sa Cavity S 'Sealer (after a certain period of time)
W Work

Claims (1)

In a high-viscosity fluid application apparatus equipped with a nozzle capable of discharging a high-viscosity fluid,
The nozzle includes a cylinder part and a gap forming part which is disposed on an inner periphery of the cylinder part and forms a gap between the discharge side of the cylinder part, and the cylinder part and the gap forming part via an insulator. And a connecting part that connects
The high-viscosity fluid coating apparatus further comprising an electrical resistance detection means for detecting an electrical resistance between the tube portion and the gap forming portion.

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