JP2007222787A - Coating gun - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating gun capable of precisely coating a target position with a coating liquid by strengthening the discharge force of a liquid body from the coating gun and by enhancing the high-speed responsibility of the valve mechanism of the coating gun, capable of reducing man powers for removing the liquid body applied in an after-process, and improving the productivity. <P>SOLUTION: The coating gun 13 is provided with a servo-motor 11, a reciprocating-motion converting means 22 converting the rotation of the servo-motor 11 to the reciprocating and straight linear motion, and an intermittent mechanism 24 connecting or releasing connecting a needle 32 to the reciprocation converting means 22. The coating gun is rotated by the servo-motor 11, the needle 32 is reciprocated by the operation of the intermittent mechanism 24 and a sealant 19 is intermitently discharged by repeating the opening and the closing of the nozzle 34. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In the present invention, for example, a liquid material such as a liquid sealing agent (hereinafter referred to as a sealant) is uniformly discharged and applied from a nozzle in order to provide a rust-proofing function and a waterproofing function at a joint portion of a panel constituting an automobile body. It relates to the application gun.

As a conventional coating gun, a nozzle that discharges a liquid material is intermittently opened and closed using an air actuator or an electromagnetic actuator, and the liquid material is applied in a continuous dot shape on a base material (for example, (See Patent Document 1).
JP-A-11-57594

FIG. 2 of Patent Document 1 will be described with reference to FIG. 15 below. In addition, the code | symbol was reassigned.
FIG. 15 is an explanatory diagram showing a conventional liquid material coating apparatus. The liquid material coating apparatus 300 is a liquid gun 302 for applying a liquid material 302 to a base material 301 and a liquid material 302 for supplying the liquid material 302 to the discharge gun 303. It comprises a body supply device 304, an air supply source 307 that supplies air to the discharge gun 303 via an electromagnetic valve 306, and a control device 308 that controls opening and closing of the electromagnetic valve 306.

  The discharge gun 303 includes a cylinder 311, a piston 312 movably provided in the cylinder 311, a needle 313 integrally attached to the piston 312, and a nozzle 314 that is opened and closed by the needle 313.

  When the discharge valve 303 is moved along the surface of the substrate 301 and the electromagnetic valve 306 is controlled by the controller 308 to supply air intermittently into the cylinder 311, the needle 313 opens and closes the nozzle 314 intermittently. The liquid material 302 is continuously applied to the base material 301 in the form of dots as shown in FIG.

  Further, in FIG. 1 of Japanese Utility Model Publication No. 7-33907 described in Patent Document 1, it is possible to open and close the nozzle hole 9 of the dispenser for dispensing a small amount of liquid by a needle valve 7b that is directly driven by a solenoid device 15. Are listed. When the needle valve 7b is intermittently driven by the solenoid device 15, the nozzle hole 9 is intermittently opened and closed, and the liquid dot-like application is possible.

In the technique of Patent Document 1, the opening / closing operation of the valve mechanism is performed by the air actuator shown in FIG. 2 or the electromagnetic actuator shown in FIG. 1 of Japanese Utility Model Publication No. 7-33907.
In general, air actuators are inferior in high-speed response, and electromagnetic actuators are improved in high-speed response. However, in the liquid material coating process, higher speed is required to improve productivity. In addition, since the electromagnetic actuator is driven by magnetic force, the discharge force of the liquid material becomes weak, so that it is difficult to accurately apply the liquid material to the target position.

  Therefore, for example, when a liquid material is applied to a portion having a complicated shape, it is necessary to increase the amount of the liquid material to ensure a rust prevention function and a waterproof function. As a result, the number of man-hours for removing the excess liquid material in the subsequent process increases.

  The object of the present invention is to increase the discharge force for discharging the liquid material from the application gun, and to improve the high-speed response of the valve mechanism of the application gun so that the liquid material can be applied to the target position with high accuracy, and the post-process An object of the present invention is to provide a coating gun that can reduce the man-hours for removing the applied liquid material and improve productivity.

  According to a first aspect of the present invention, there is provided an application gun that opens a nozzle by moving a needle that closes the nozzle, discharges the liquid material from the nozzle, and applies the liquid material to an object to be coated. And a reciprocating motion converting means for converting the rotational motion of the rotational driving means into a reciprocating linear motion, and a connecting means for connecting or releasing the needle to and from the reciprocating motion converting means. The needle is reciprocated by actuating the means, and the liquid material is intermittently discharged by repeatedly opening and closing the nozzle.

  As an action, the rotational movement of the rotation driving means is converted into a reciprocating linear movement by the reciprocating movement converting means, the needle connected to the reciprocating movement converting means by the connecting means is reciprocated linearly moved, and the opening and closing of the nozzle with the needle is repeated, and the liquid material is changed. Discharge intermittently to apply the liquid material to the object to be coated in dots.

If the rotational speed of the rotational driving means is increased, the cycle of the reciprocating linear motion of the needle is shortened accordingly, and the number of liquid discharges per unit time is increased. Thus, by controlling the number of rotations of the rotation driving means, the number of discharges of the liquid material is increased or decreased, so that the discharge amount of the liquid material can be easily controlled.
Moreover, since the effect which pushes out a liquid material with a needle arises by making the torque output of a rotation drive means large, the discharge force which discharges a liquid material becomes large.

The invention according to claim 2 is characterized in that the reciprocating motion converting means and the needle are connected by the connecting means when the rotation driving means reaches a predetermined rotational speed.
As an operation, when the reciprocating motion converting means and the needle are connected by the connecting means when the rotation of the rotation driving means is stabilized, the reciprocating linear motion of the needle is stabilized and the liquid material can be discharged uniformly.

  In the invention according to claim 3, a cylinder is disposed between the connecting means and the nozzle, and a piston interposed between the needle and the connecting means is movably accommodated in the cylinder, and the reciprocating motion is converted by the connecting means. When the connection between the means side and the needle side is released, the needle is reciprocated by repeatedly supplying air to the one side air filling part and the other side air filling part formed on both sides of the piston in the cylinder. It is characterized by linear motion.

  As a function, when applying a liquid by moving the coating gun at a low speed relative to the object to be coated, the supply of air to the one side air filling unit and the other side air filling unit is repeated, and the needle is moved back and forth linearly. By moving and opening and closing the nozzle, the liquid material is applied to the object to be coated in the form of dots.

  In the invention according to claim 4, a cylinder is disposed between the connecting means and the nozzle, and a piston interposed between the needle and the connecting means is movably accommodated in the cylinder, and the reciprocating motion is converted by the connecting means. The other side air filling formed on the other side of the piston in the cylinder against the elastic force of the elastic body arranged on one side of the piston in the cylinder when the connection between the means side and the needle side is released The needle is reciprocated linearly by intermittently supplying air to the unit.

  As an action, when the liquid is applied by moving the application gun at a low speed relative to the object to be applied, the air supply to the other side air filling section is intermittently resisted against the elastic force of the elastic body. Repeatedly, the needle is reciprocated linearly, and the nozzle is opened and closed to apply the liquid material to the object to be coated in the form of dots.

  In the invention according to claim 1, a rotation driving means, a reciprocating motion converting means for converting the rotational motion of the rotational driving means into a reciprocating linear motion, and a needle connected to or disconnected from the reciprocating motion converting means. Connecting means, rotating the rotating means by the rotation driving means, reciprocating the needle by operating the connecting means, and intermittently discharging the liquid material by repeatedly opening and closing the nozzle, so that the rotation driving means continuously rotates Is converted into the reciprocating linear motion of the needle by the reciprocating motion converting means. By increasing the rotational speed of the rotation driving means, the cycle of the reciprocating linear motion of the needle can be shortened, and the conventional air actuator and electromagnetic actuator can be used. Compared to driving, the nozzle can be opened and closed at a higher speed. Therefore, the moving speed of the coating gun can be increased, and the productivity in the liquid material coating process can be improved.

In addition, since it is a mechanical drive compared to the drive by the conventional air actuator and electromagnetic actuator, it is possible to increase the liquid material discharge force by increasing the torque output of the rotation drive means. In combination with increasing the number of rotations of the driving means, the liquid material can be accurately applied to a predetermined position of the object to be coated.
Therefore, it is not necessary to apply an excessive amount of liquid material, the amount of liquid material applied can be reduced, and the cost can be reduced.

  Furthermore, by controlling the number of reciprocating movements per unit time of the nozzle, the coating amount of the liquid material can be easily adjusted. It is possible to reduce the man-hours for removing excess liquid.

  In the invention according to claim 2, since the reciprocating motion converting means and the needle are connected by the connecting means when the rotational driving means reaches a predetermined number of rotations, the rotational motion of the rotational driving means is set to a predetermined value. Since the connection is performed after maintaining the rotational speed, the liquid material can be stably applied without being affected by the increase or decrease of the rotation of the rotation driving means.

  In the invention according to claim 3, a cylinder is disposed between the connecting means and the nozzle, and a piston interposed between the needle and the connecting means is movably accommodated in the cylinder, and the reciprocating motion is converted by the connecting means. When the connection between the means side and the needle side is released, the needle is reciprocated by repeatedly supplying air to the one side air filling part and the other side air filling part formed on both sides of the piston in the cylinder. Since it moves linearly, for example, when applying a liquid material to a part with a complex shape by moving the application gun at a low speed relative to the object to be coated, it is stable while allowing the liquid material to blend into the object to be coated. Can be applied.

  In the invention according to claim 4, a cylinder is disposed between the connecting means and the nozzle, and a piston interposed between the needle and the connecting means is movably accommodated in the cylinder, and the reciprocating motion conversion is performed by the connecting means. The other side air filling formed on the other side of the piston in the cylinder against the elastic force of the elastic body arranged on one side of the piston in the cylinder when the connection between the means side and the needle side is released Since the needle is reciprocated linearly by intermittently supplying air to the part, for example, by moving the coating gun at a low speed relative to the object to be coated, the liquid material is applied to the complicated part of the object to be coated. Can be applied stably while the liquid material is blended with the object to be coated.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is an explanatory view showing a liquid material coating apparatus according to the present invention. A liquid material coating apparatus 10 is connected to a servo motor 11 as a power source and a rotating shaft 11a of the servo motor 11 via a coupling 12. The applied gun 13, the sealant supply unit 14 that supplies the liquid material sealant to the application gun 13, the air supply unit 16 that supplies air to the application gun 13, the servo motor 11, the application gun 13, and the sealant supply And a control unit 17 that controls the operation of the unit 14 and the air supply unit 16. Reference numeral 18 denotes a vehicle body that requires a seal for providing a rust prevention function and a waterproof function, for example, at a joint portion between panels as an object to be applied disposed at a predetermined distance from the tip of the application gun 13 in order to apply the sealant 19. is there.

  The coating gun 13 includes a housing 20, an input shaft 21 connected to the coupling 12, a reciprocating motion conversion mechanism 22 connected to the tip of the input shaft 21 for converting a rotational motion into a reciprocating linear motion, and the reciprocating motion. An intermittent mechanism 24 connected to the first output rod 23 serving as the output of the conversion mechanism 22 for transmitting or stopping the reciprocating linear motion to the downstream side of the power, and a second output rod 26 serving as the output of the intermittent mechanism 24. A reciprocating motion transmission mechanism 27 coupled to the reciprocating motion transmission mechanism 27, a piston 31 coupled to the reciprocating motion transmission mechanism 27 and movably inserted into a cylinder 28 formed in the housing 20, a needle 32 attached to one end of the piston 31, The sealant filling portion 33 provided around the distal end side of the needle 32 and the distal end portion 32 a of the needle 32 are opened and closed at the distal end of the housing 20. Comprising a nozzle 34 for providing the. Reference numeral 36 denotes a bush that rotatably supports the input shaft 21, and reference numeral 37 denotes a packing that prevents the sealant 19 from flowing into the cylinder 28 from the sealant filling portion 33.

  The sealant supply unit 14 includes a tank 41 that stores the sealant 19, a pump 42 that pumps the sealant 19 from the tank 41 and sends it to the coating gun 13 side, and a sealant flow path (one-dot chain line in the figure) connected to the pump 42. A supply-side circulation valve 44 that opens and closes, a pressure reducing valve 47 connected to the supply-side circulation valve 44 and connected to a sealant inlet 46 communicating with the sealant filling portion 33, and a sealant filling It is a device that includes a return side circulation valve 51 connected to a sealant outlet 48 communicating with the portion 33 and connected to a pump 42, and supplies the sealant 19 while circulating it. Reference numeral 53 denotes a sealant supply path from the pump 42 to the sealant inlet 46, and reference numeral 54 denotes a sealant return path from the sealant outlet 48 to the pump 42.

  The air supply unit 16 includes an air pump 67, a first flow path 61 extending from the air pump 67 to the first air inlet 68 on the cylinder 28 side via the electromagnetic valve 71, and the cylinder 28 side from the air pump 67 via the electromagnetic valve 72. A second flow path 62 leading to the second air inlet 69, a third flow path 63 leading from the air pump 67 via the electromagnetic valve 73 to the return side circulation valve 51, and a supply side from the air pump 67 via the electromagnetic valve 74. A fourth flow path 64 reaching the circulation valve 44 and a fifth flow path 65 extending from the air pump 67 via the electropneumatic proportional valve 75 to the pressure reducing valve 47 are included.

  The supply-side circulation valve 44 and the return-side circulation valve 51 are valves for circulating (ON) or stopping (OFF) the sealant circulating in the sealant flow path based on a control signal from a control device 81 described later. It is.

The control unit 17 includes electromagnetic valves 71 to 74 and an electropneumatic proportional valve 75, and a control device 81 that controls opening and closing of the electromagnetic valves 71 to 74 and the electropneumatic proportional valve 75. The control unit 81 includes a servo motor. 11 and the intermittent mechanism 24 are also controlled.
The electropneumatic proportional valve 75 adjusts the amount of sealant discharged from the nozzle 34 by opening and closing the pressure reducing valve 47 with air based on a control signal from the control device 81.

2A to 2D are explanatory views showing a reciprocating motion conversion mechanism (first embodiment) according to the present invention.
In (a), the reciprocating motion conversion mechanism 22 includes a hollow portion 91 formed in the housing 20 (see FIG. 1), a drive gear 92 attached to the tip of the input shaft 21, and a housing for meshing with the drive gear 92. 20, a driven gear 93 rotatably attached to the shaft 20, an eccentric shaft 94 attached to the driven gear 93 so as to be eccentric with respect to the rotating shaft 93 a of the driven gear 93, and the eccentric shaft 94 engaged with the housing 20. The drive gear 92, the driven gear 93, and the slide portion 96 are housed in the hollow portion 91. The slide portion 96 is slidably mounted. As the drive gear 92 and the driven gear 93 described above, for example, a bevel gear is suitable.
The slide portion 96 is a portion integrally connected to the linear motion member 101 on the intermittent mechanism side via the first output rod 23. If the shape and size of the application gun 13 are not particularly limited, a mechanism in which the input shaft 21 is directly connected to the rotary shaft 93a without using the gear mechanism of the drive gear 92 and the driven gear 93 may be used.

(B) is a b arrow view of (a), and is explanatory drawing which shows the slide part 96. FIG.
The slide portion 96 is a rectangular frame member that surrounds the eccentric shaft 94, and the eccentric shaft 94 moves up and down in the frame of the slide portion 96 when rotated around the rotation shaft 93a.

The operation of the reciprocating motion conversion mechanism 22 described above will be described in the following (c) and (d).
When the input shaft 21 is rotated from the state of (b), the driven gear 93 is rotated counterclockwise, for example, and the eccentric shaft 94 of the driven gear 93 is moved from the right side to the upper side in FIG. The eccentric shaft 94 also moves to the left, and accordingly, the slide portion 96 slides to the left. Accordingly, the first output rod 23 integrally connected to the slide portion 96 moves the linear motion member 101 to the left.

  In (d), when the driven gear 93 further rotates counterclockwise, the eccentric shaft 94 moves from the upper side to the left side, and the slide portion 96 further moves to the left. Accordingly, the first output rod 23 further moves the linear motion member 101 to the left. Thereafter, when the driven gear 93 further rotates counterclockwise, the eccentric shaft 94 moves from the left side to the lower side, and further moves from the lower side to the right side, so that the slide portion 96, the first output rod 23, and the linear motion are moved. The member 101 moves to the right. Thus, if the input shaft 21 rotates continuously, the eccentric shaft 94 reciprocates left and right, so that the slide portion 96, the first output rod 23, and the linear motion member 101 reciprocate linearly.

FIGS. 3A to 3D are explanatory diagrams of the interrupting mechanism (second embodiment) according to the present invention.
In (a), the intermittent mechanism 24 is configured such that the linear motion member 101 and the coupling member 102 coupled to or decoupled from the linear motion member 101 are movably accommodated in the hollow portion 103. The second output rod 26 is integrally connected.

  The linear motion member 101 includes a box-shaped linear motion main body 105, an electromagnetic actuator 106 provided in the linear motion main body 105, and a rod-like actuator-side rod 107 driven by the electromagnetic actuator 106.

  The connecting member 102 includes a connecting base portion 102 </ b> A, and an output side rod 108 that is movably extended from the connecting base portion 102 </ b> A into the linear motion main body 105 and is coupled to the actuator side rod 107.

  The electromagnetic actuator 106 is controlled by the control device 81 to advance and retract the actuator-side rod 107. (A) shows a state in which the linear motion member 101 has moved to the right end in the hollow portion 103 and a state in which the connecting member 102 has come to rest at the left end of the hollow portion 103.

(B) shows a state in which the linearly moving member 101 has moved to the leftmost side in the hollow portion 103, and shows a state in which the connecting member 102 is stationary at the left end of the hollow portion 103 as in (a).
As shown in (a) and (b) above, in a state where the linear motion member 101 and the connecting member 102 are not connected, the linear motion member 101 simply reciprocates linearly in the hollow portion 103.

The operation of the intermittent mechanism 24 described above will be described with reference to (c) and (d).
In (c), the electromagnetic actuator 106 pulls the actuator-side rod 107 as shown by the arrow by the coupling signal CS from the control device 81. As a result, the flange portion 108a of the output side rod 108 is locked and pulled by the flange portion 107a of the actuator side rod 107, and the connecting member 102 is integrally coupled to the linear motion member 101.

  (D) shows a state in which the linear motion member 101 and the connecting member 102 are integrally coupled and move to the left in the figure as indicated by an arrow. Therefore, the reciprocating linear motion on the first output rod 23 side is transmitted to the second output rod 26 side.

FIG. 4 is an enlarged view of a main part of the coating gun according to the present invention.
The reciprocating motion transmission mechanism 27 includes an intermediate rod 113 having one end connected to the tip of the second output rod 26 and the other end attached to the piston 31, an annular wall 116 provided at one end of the cylinder 28, and the piston 31. It comprises a compression coil spring 117 interposed therebetween.

  When the second output rod 26 moves to the right in the drawing, it pulls the piston 31 to the right via the intermediate rod 113.

  The compression coil spring 117 is a member that presses the needle 32 against the inner opening end of the nozzle 34 via the piston 31 and closes the nozzle 34 with a predetermined force.

  The cylinder 28 is a portion separated by a piston 31 between a first chamber 121 on the reciprocating motion transmission mechanism 27 side and a second chamber 122 on the needle 32 side. By supplying air to the first chamber 121, this air The needle 32 is pressed against the inner opening end of the nozzle 34 by the force of the pressure of the compression coil spring 117 and the compression force of the compression coil spring 117, the nozzle 34 is closed, and air is supplied to the second chamber 122. , The needle 32 is moved away from the nozzle 34 and the nozzle 34 is opened. Further, the same operation can be performed by repeating the supply of air to the first chamber 121 and the supply of air to the second chamber 122 without providing the compression coil spring 117.

The sealant filling part 33 is a part for temporarily storing the sealant before the sealant is injected from the nozzle 34.
The needle 32 has a tip 32a having a spherical shape, and ensures sealing performance by being in close contact with a circular inner opening end on the nozzle 34 side.
In addition, when the sealant is difficult to be removed from an appropriate position and difficult to cut when applied to a complicated shape or a plate joining portion of the body, the shape of the injection port 34a of the nozzle 34 is particularly circular or elliptical. The shape is not limited.

The procedure for applying the sealant by the reciprocating linear motion described above will be described next.
5 (a) to 5 (c) are operation diagrams showing the application procedure of the sealant by the reciprocating linear motion according to the present invention.
(A) does not actuate the servo motor 11 and supplies air to the first chamber 121 of the cylinder 28 as shown by the arrow a, presses the needle 32 against the nozzle 34, closes the nozzle 34, and sealant supply unit 14 (see FIG. 1) is activated, and the sealant filling part 33 is filled with the sealant 19 as shown by the arrow b.

  In (b), after the supply of air to the first chamber 121 of the cylinder 28 is stopped, the servo motor 11 is operated, and the rotation of the rotating shaft 11a of the servo motor 11 is converted into a reciprocating linear motion by the reciprocating motion converting mechanism 22. Then, the reciprocating motion converting mechanism 22 and the reciprocating motion transmitting mechanism 27 are connected by the intermittent mechanism 24.

  As a result, the state in which the nozzle 34 is closed and the state in which the nozzle 34 shown in (c) is opened are repeated, and the sealant 19 filled in the sealant filling part 33 is intermittently injected as shown in (c). Then, the sealant 19 is continuously applied to the workpiece 18 in the form of dots.

The sealant 19 starts to be injected at a pressure in the sealant filling portion 33 from the time when the nozzle 34 is opened, but after the nozzle 34 is opened, the needle 32 is closed from the rear end position of the stroke until the nozzle 34 is closed. Jets rapidly by pushing out the sealant 19.
During spraying of the sealant 19, the coating gun 13 is moved along the workpiece 18.

  In this way, since the continuous rotation of the servo motor 11 is converted into a reciprocating linear motion by the reciprocating motion converting mechanism 22 and the nozzle 34 is opened and closed by the reciprocating linear motion of the needle 32, the rotational speed of the servo motor 11 is increased. The number of reciprocating motions per unit time of the needle 32, that is, the opening and closing frequency of the nozzle 34 can be increased smoothly, which is suitable for high-frequency discharge, thereby moving the coating gun 13 at high speed, that is, high-speed coating. It becomes possible. Therefore, productivity in the sealant application process can be improved.

  Further, the stroke amount of the needle 32 shown in FIG. 5C can be changed by changing the distance between the rotating shaft 93a and the eccentric shaft 94 of the reciprocating motion conversion mechanism 22 shown in FIG. If the stroke amount of the needle 32 is increased, the discharge amount of the sealant 19 can be increased. Further, by increasing the torque output of the servo motor 11, it is possible to increase the discharge force. In addition to increasing the rotation speed of the servo motor 11, the sealant 19 is aimed at a predetermined target of the workpiece 18. It can be applied to the position with high accuracy.

  Therefore, it is not necessary to apply an excessive amount of sealant 19, and the amount of sealant 19 applied can be reduced, and the cost can be reduced. Man-hours to be removed can be reduced.

6 (a) to 6 (d) are explanatory views showing the application state of the sealant according to the present invention.
(A) shows the state which apply | coated the sealant 19 continuously in the shape of a dot. Each dot has almost the same shape, and the width of the sealant is almost constant in any part.

  (B) shows one dot-like sealant 19a (the sealant 19 is referred to as a sealant 19a for convenience of explanation). B1 indicates the maximum width of the sealant 19a, and H1 indicates the maximum height of the sealant 19a.

  (C) shows one dot-like sealant 19b (the sealant 19 is referred to as a sealant 19b for convenience of explanation). The sealant 19b is obtained by increasing the discharge amount per one time from the coating gun or extending the discharge time per time as compared with the sealant 19a shown in FIG. B2 indicates the maximum width of the sealant 19b, and H2 indicates the maximum height of the sealant 19b. B2> B1 and H2> H1. The cross section of the sealant 19b has a high center and a low peripheral edge.

  (D) shows that the sealant 19 was applied under the same conditions as shown in (a), the movement range of the application gun was expanded, and the application range was expanded. Thus, in the coating gun of the present invention, it is possible to deal with the shape of each part of the body by coating under the same conditions without changing the coating amount and expanding the coating range. In addition, a wide range of application is possible by attaching an application gun to a general articulated robot or robot such as an XY table.

  FIG. 7 is a graph showing temporal changes between the operating state of the liquid coating apparatus and the coating state of the sealant according to the present invention. The vertical axis of the graph represents the rotation speed of the servo motor (unit: rpm), which is the rotation speed of the servo motor 11 (see FIG. 1), ON (connected) / OFF (disconnected) of the intermittent mechanism 24 (see FIG. 1), nozzle 34 (See FIG. 1) Open / close (when servo motor speed = R) and sealant application shape when servo motor speed = R, respectively, and the horizontal axis represents time.

  At time t1, the operation of the servo motor is started. As a result, the rotational speed of the rotation shaft of the servo motor gradually increases, reaches a constant rotational speed R at time t2, and thereafter maintains the rotational speed R.

When the intermittent mechanism is turned on at time t3, that is, when the servo motor side and the needle side are connected, the nozzle 34 is periodically opened and closed. The period at this time is T1 (for example, 0.005 sec), and the nozzle open time is J1.
At this time, the electropneumatic proportional valve 75 in FIG. 1 is controlled so that the discharge amount of the nozzle 34 is adjusted to a predetermined value by the pressure reducing valve 47 of the sealant supply unit 14. B3 dots are applied.

  Further, when the electropneumatic proportional valve is controlled and the discharge amount of the nozzle is increased from a predetermined value by the sealant supply unit, the width is larger than the width B3 every time J1, and as shown in FIG. 6 (c). A dot having a large height (thickness) is applied.

  As described above, by adjusting the discharge amount controlled by the electro-pneumatic proportional valve and the rotation speed of the servo motor, it is possible to cope with various shapes of coating objects. Also, since the rotary motion of the servo motor is maintained at a predetermined rotational speed R and then the intermittent mechanism is turned on (connected), the sealant can be stably maintained without being affected by the rise or fall of the servo motor rotation. Can be applied.

The procedure for applying the sealant by the air supply described above will be described next.
8 (a) and 8 (b) are operation diagrams showing the procedure for applying the sealant by supplying air according to the present invention.
In (a), the servo motor 11 is not operated, air is supplied to the first chamber 121 of the cylinder 28, the needle 32 is pressed against the nozzle 34, the nozzle 34 is closed, and the sealant supply unit 14 (see FIG. 1) is opened. When operated, as shown by an arrow c, the sealant filling portion 33 is filled with the sealant 19, and the reciprocating linear motion portion of the reciprocating motion conversion mechanism 22 (the slide portion 96 shown in FIG. 2B) is moved most backward, With the linear motion member 101 (see FIG. 2B) moved to the rear end, air is supplied to the second chamber 122 of the cylinder 28 as indicated by an arrow d.
As a result, the nozzle 34 opens and the sealant 19 starts to be injected from the nozzle 34.

  As described above, the reason why the linear motion member 101 is moved to the rear end is to ensure the stroke amount of the needle 32 by maximizing the range of movement of the connecting member 102 adjacent to the linear motion member 101. Thus, the stroke amount of the needle 32 can be increased.

Next, in (b), the supply of air to the second chamber 122 is stopped, and air is supplied to the first chamber 121 instead, as indicated by an arrow e. As a result, the nozzle 34 is closed and the injection of the sealant 19 is stopped. Thus, by repeating the supply of air to the first chamber 121 and the second chamber 122, the nozzle 34 can be intermittently opened and closed, and the sealant 19 is removed from the nozzle 34 by the pressure in the sealant filling portion 33. The spraying can be performed intermittently, and the sealant 19 can be continuously applied to the workpiece 18 in the form of dots.
During spraying of the sealant 19, the coating gun 13 is moved along the workpiece 18.

  In the application of the sealant by air supply as described above, the opening and closing cycle of the nozzle 34 is made longer than the opening and closing cycle of the nozzle 34 in the case of applying the sealant by a reciprocating linear motion using a servo motor. The sealant 19 can be stably applied to the object to be coated 18 in a shape, and the coating quality can be improved. As described above, the liquid coating apparatus of the present invention can select a driving method suitable for an object to be coated, cycle time, equipment cost, etc., such as servo motor driving or air driving.

FIGS. 9A and 9B are explanatory views showing a reciprocating motion conversion mechanism (third embodiment) according to the present invention. The same reference numerals are given to the same components as those of the first embodiment shown in FIG. Detailed description is omitted.
In (a), the reciprocating motion conversion mechanism 131 includes a hollow portion 91, a drive gear 92, a driven gear 93, an eccentric shaft 94, and a connecting rod 132 connected to the eccentric shaft 94. The linear motion member 101 on the intermittent mechanism side is integrally connected through the first output rod 23.

(B) is a view as viewed in the direction of arrow b in (a), and shows the connection between the eccentric shaft 94 and the connecting rod 132 and the connection between the connecting rod 132 and the first output rod 23.
The connecting rod 132 and the first output rod 23 are connected by a pin 133 so as to be swingable. As a result, the connecting lot 132 swings around the pin 133 as the driven gear 93 rotates, and the first output rod 23 and the linear motion member 101 reciprocate linearly.

10 (a) and 10 (b) are explanatory views showing a reciprocating motion conversion mechanism (fourth embodiment) according to the present invention. The same reference numerals are given to the same components as those in the first embodiment shown in FIG. Detailed description is omitted.
In (a), the reciprocating motion conversion mechanism 141 includes a hollow portion 91, a drive gear 92, a driven gear 93, a crankshaft 142 attached to the rotation center of the driven gear 93, and a swingable movement on the crankshaft 142. The connecting rod 143 is attached, and the connecting member 143 is connected integrally with the linear motion member 101 on the intermittent mechanism side via the first output rod 23.

  (B) is a view as viewed in the direction of arrow b in (a), and shows the connection between the crankshaft 142 and the connecting rod 143 and the connection between the connecting rod 143 and the first output rod 23.

  The connecting rod 143 and the first output rod 23 are swingably connected by a pin 133. Accordingly, the connecting lot 143 swings around the pin 133 via the crankshaft 142 as the driven gear 93 rotates, and the first output rod 23 and the linear motion member 101 reciprocate linearly.

11 (a) and 11 (b) are explanatory views showing a reciprocating motion conversion mechanism (fifth embodiment) according to the present invention. The same reference numerals are given to the same components as those of the first embodiment shown in FIG. Detailed description is omitted.
In (a), the reciprocating motion conversion mechanism 151 includes a hollow portion 91, a drive gear 92, and a driven gear 93.

  (B) is a b arrow view of (a). The driven gear 93 has an elliptical cam groove 152 formed on the bottom surface, and a convex member 153 provided at the tip of the first output rod 23 is movably inserted into the cam groove 152.

12 (a) and 12 (b) are explanatory views showing a reciprocating motion conversion mechanism (sixth embodiment) according to the present invention. The same reference numerals are given to the same components as those in the first embodiment shown in FIG. Detailed description is omitted.
In (a), the reciprocating motion conversion mechanism 161 includes a hollow portion 91, a drive gear 92, a driven gear 93, and a shaft member 162 attached to the rotation center of the driven gear 93.

(B) is a view taken in the direction of arrow b in (a). The reciprocating motion conversion mechanism 161 is in sliding contact with a substantially triangular triangular cam 164 attached to the shaft member 162 and a cam surface 165 on the outer periphery of the triangular cam 164. A box-shaped cam receiving member 167 having an inner surface 166. The cam receiving member 167 is a member connected to the first output rod 23.
When the triangular cam 164 is rotated with the rotation of the driven gear 93, the cam receiving member 167 slidably in contact with the triangular cam 164 linearly moves left and right in the drawing, and the first output rod 23 and the linear motion member 101 reciprocate linearly. .

13 (a) and 13 (b) are explanatory views of the interrupting mechanism (seventh embodiment) according to the present invention. The same components as those of the second embodiment shown in FIG. Omitted.
In (a), the intermittent mechanism 171 is configured such that a linear motion member 172 and a coupling member 173 coupled to or decoupled from the linear motion member 172 are accommodated in the hollow portion 103, and the second output is output to the coupling member 173. The rod 26 is connected integrally.
The housing 20 includes an inlet 174 for injecting fluid such as air and oil from the outside into the hollow portion 103.

  The linear motion member 172 includes a cylinder portion 176 that always communicates with the injection port 174 during the reciprocating linear motion, and the connection member 173 includes a connection base portion 102A and a rod that extends movably from the connection base portion 102A into the cylinder portion 176. 177 and a piston 178 formed integrally with the rod 177 and movably inserted into the cylinder portion 176.

  In (b), when the fluid 179 is injected into the cylinder part 176 from the injection port 174, the piston 178 is pressed against the one end 176 a of the cylinder part 176 by the pressure of the fluid 179. As a result, the linear motion member 172 and the connecting member 173 are coupled and moved integrally.

14 (a) and 14 (b) are explanatory views of an interrupting mechanism (eighth embodiment) according to the present invention. The same components as those of the second embodiment shown in FIG. Omitted.
In (a), the intermittence mechanism 181 includes a linear member 182 and a connecting member 183 that is connected to or disconnected from the linear member 182 in the hollow portion 103, and outputs the second output to the connecting member 183. The rod 26 is connected integrally.
The housing 20 includes an inlet 174 for injecting fluid such as air and oil from the outside into the hollow portion 103.

The linear motion member 182 includes a linear motion main body 185 and a lock mechanism 186 that is movably attached to the linear motion main body 185.
The linear motion main body 185 is a member formed with a hollow portion 188, a cylinder portion 191 that always communicates with the injection port 174 during reciprocating linear motion, and a communication hole 192 that communicates each of the hollow portion 188 and the cylinder portion 191. The lock mechanism 186 has a triangular lock piece 194 arranged in the hollow portion 188 in a side view, one end attached to the lock piece 194 and movably inserted into the communication hole 192, and a flange 196 at the other end. The rod-shaped member 197 provided and a compression coil spring 198 interposed between the flange 196 and the bottom of the cylinder part 191 are provided.

  The connecting member 183 includes a connecting base portion 102A, a rod 201 movably extending from the connecting base portion 102A into the hollow portion 188, and a triangular lock piece receiver 202 attached to the tip of the rod 201. .

  In (b), when the fluid 179 is injected into the cylinder portion 191 from the injection port 174, the rod-shaped member 197 moves toward the hollow portion 188 against the elastic force of the compression coil spring 198 due to the pressure of the fluid 179. As a result, the lock piece 194 of the lock mechanism 186 presses the lock piece receiver 202 of the connecting member 183, and the connecting member 183 comes into contact with the inclined surface 194a on the lock piece 194 side and the inclined surface 202a on the lock piece receiver 202 side. The linear motion member 182 and the connecting member 183 are coupled to each other and reciprocating linearly move together.

  In this embodiment, as shown in FIG. 1, the servo motor 11 is connected to the reciprocating motion converting mechanism 22 via the coupling 12. However, the present invention is not limited to this, and the reciprocating motion converting mechanism is connected via the flexible coupling. The servo motor 11 and the application gun 13 may be provided separately.

  Further, the rotational speed of the rotary shaft 11a of the servo motor 11 and the rotational speed of the input shaft 21 are the same. However, the speed reduction mechanism is not limited to this, and a speed reduction mechanism is provided between the servo motor 11 and the input shaft 21. May decelerate at a predetermined reduction ratio. Further, the discharge force can be easily increased by appropriately adjusting the reduction ratio.

  Furthermore, although the servo motor is used as the rotation driving means, the present invention is not limited to this, and it may satisfy the requirements of the rotation speed and torque and can be controlled from the outside.

  The application gun of the present invention is suitable for application of a sealant to an automobile body.

It is explanatory drawing which shows the liquid body coating device which concerns on this invention. It is explanatory drawing which shows the reciprocating motion conversion mechanism (1st Embodiment) which concerns on this invention. It is explanatory drawing of the interruption mechanism (2nd Embodiment) which concerns on this invention. It is a principal part enlarged view of the application | coating gun which concerns on this invention. It is an effect | action figure which shows the coating procedure of the sealant by the reciprocating linear motion which concerns on this invention. It is explanatory drawing which shows the application | coating state of the sealant which concerns on this invention. It is a graph which shows the time change of the operation state of the liquid substance coating device which concerns on this invention, and the application state of a sealant. It is an action figure which shows the coating procedure of the sealant by the air supply which concerns on this invention. It is explanatory drawing which shows the reciprocating motion conversion mechanism (3rd Embodiment) based on this invention. It is explanatory drawing which shows the reciprocating motion conversion mechanism (4th Embodiment) which concerns on this invention. It is explanatory drawing which shows the reciprocating motion conversion mechanism (5th Embodiment) which concerns on this invention. It is explanatory drawing which shows the reciprocating motion conversion mechanism (6th Embodiment) which concerns on this invention. It is explanatory drawing of the interruption mechanism (7th Embodiment) which concerns on this invention. It is explanatory drawing of the interruption mechanism (8th Embodiment) which concerns on this invention. It is explanatory drawing which shows the conventional liquid substance coating device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Liquid material coating device, 11 ... Rotation drive means (servo motor), 13 ... Coating gun, 18 ... Coating object, 19 ... Liquid material (sealant), 22 ... Reciprocating motion conversion means (reciprocating motion converting mechanism), 24 ... connecting means (intermittent mechanism), 28 ... cylinder, 31 ... piston, 32 ... needle, 34 ... nozzle, 121 ... one side air filling part (first chamber), 122 ... other side air filling part (second chamber).

Claims (4)

In an application gun that opens the nozzle by moving a needle that closes the nozzle and discharges the liquid material from the nozzle, and applies the liquid material to an object to be applied,
The coating gun includes a rotation driving means, a reciprocating motion converting means for converting a rotational motion of the rotational driving means into a reciprocating linear motion, and a connecting means for connecting or releasing the needle to or from the reciprocating motion converting means.
An application gun characterized in that the needle is reciprocated by rotating the rotary drive means and operating the connecting means, and the liquid material is intermittently discharged by repeatedly opening and closing the nozzle.   The coating gun according to claim 1, wherein when the rotation driving means reaches a predetermined number of rotations, the connecting means connects the reciprocating motion converting means and the needle.   A cylinder is arranged between the connecting means and the nozzle, and a piston interposed between the needle and the connecting means is movably accommodated in the cylinder, and the reciprocating motion converting means side is connected by the connecting means. When the connection between the needle side and the needle side is released, the needle is repeatedly supplied with air to the one side air filling part and the other side air filling part formed on both sides of the piston in the cylinder. The coating gun according to claim 1, wherein the coating gun is reciprocated linearly.   A cylinder is arranged between the connecting means and the nozzle, and a piston interposed between the needle and the connecting means is movably accommodated in the cylinder, and the reciprocating motion converting means side is connected by the connecting means. And the other side formed on the other side of the piston in the cylinder against the elastic force of the elastic body arranged on one side of the piston in the cylinder when the connection between the needle side and the needle side is released The coating gun according to claim 1 or 2, wherein the needle is reciprocated linearly by intermittently supplying air to the side air filling section.

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