JP2007150096A - Nozzle mounting mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable it to restrain certainly a nozzle mounted to the shaft tip in the rotation direction also. <P>SOLUTION: In the nozzle mounting mechanism, the rear end of a nozzle 12 is inserted into the tip of a cylindrical shaft 10. The mechanism is provided with a groove 14 having a wall whose spacing dwindles in the direction of the back end formed in the inner circumference surface of the shaft 10, and an engagement pin 16 projected from the nozzle 12 making it possible to engage with the groove 14. Thus, the mechanism nozzle 12 comprises a nozzle mounting means for making the engagement pin 16 compulsorily bring into contact with the wall of the groove 14, by pulling in the rear part of the nozzle 12 inserted into the shaft in its axial direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a nozzle mounting mechanism, and more particularly to a nozzle mounting mechanism for a replaceable nozzle that is suitable for application to an electronic component mounting machine that sucks an electronic component by a nozzle mounted on a shaft and mounts the electronic component on a substrate.

  Conventionally, an electronic component mounting machine adsorbs an electronic component by a nozzle mounted on a shaft mounted on the head unit, and then moves and positions the head unit in an XY direction by an XY robot (drive unit). It is used to automatically mount electronic components at predetermined positions on a substrate.

  In such an electronic component mounting apparatus, in accordance with the diversification of the types and sizes of electronic components, it is a common practice to replace nozzles mounted on the same shaft with a nozzle mounting mechanism in order to cope with this.

  FIG. 4 shows an example of a conventional nozzle mounting mechanism (see, for example, Patent Document 1). In the figure, reference numeral 100 denotes a shaft mounted on a head unit that is moved in the XY direction by the XY robot, and a nozzle 102 that adsorbs a component (not shown) is attached to the tip (lower end in the figure). Has been.

  In this nozzle mounting mechanism, the shaft 100 is formed in a cylindrical shape, and a spring fixing portion 104 that fixes a spring on the outer periphery near the tip thereof, and a collar-shaped nozzle adapter 106 that can slide on the outer peripheral portion of the shaft 100. A spring 108 is interposed between the two, and the nozzle adapter 106 is biased downward by the spring 108 and is movable up and down. Further, a steel ball 110 is accommodated in a space sandwiched between the outer periphery of the tip end of the shaft 100 and the nozzle adapter 106, and a part of the steel ball 110 protrudes inward on the shaft side contacting the steel ball 110. The hole 112 is formed.

  On the other hand, the nozzle 102 has a rear end portion (upper end portion in the drawing) inserted inside the front end portion of the shaft 100 to be mounted and held. Further, on the outer periphery of the rear end portion of the shaft 102, a groove portion 114 in which a part of the steel ball 110 protruding from the hole 112 to the inside of the shaft 100 can be fitted is formed in the circumferential direction.

  Therefore, the rear end portion of the nozzle 102 is inserted into the front end portion of the shaft 100 and pushed in, so that the steel ball 110 is inserted into the shaft by the tapered portion 106A provided at the inner diameter portion of the nozzle adapter 106 biased by the spring 108. 100 can be pressed into the hole 112, and when the pressed steel ball 110 is forcibly pushed into the groove 114, the nozzle 102 is pulled in the axial direction and further hits the lower end surface of the shaft, so that The position is restricted. Conversely, by pushing up the nozzle adapter 106 in the axial direction by an external force, the nozzle 102 can be removed by releasing the urging force that presses the steel ball 110 inward from the inner diameter of the shaft 100.

JP 2002-208798 A

  However, in the conventional nozzle mounting mechanism in which a part of the steel ball 110 is fitted in the circumferential groove 114 shown in FIG. 4, the shaft 100 can be restrained in the axial direction, but the nozzle adapter 106 and the steel ball 110, and between the nozzle 102 and the steel ball 110, slip in the circumferential direction occurred, and the nozzle 102 could not be restrained in the rotational direction. As a result, when the shaft 100 is rotated, the rotation angle may not match the rotation angle of the nozzle 102. In particular, an electronic component having a large mass is sucked by the nozzle 102 and rotated to correct the angle. When mounted, there is a problem that the mounting angle of the component does not coincide with the target.

  The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a nozzle mounting mechanism that can reliably restrain the nozzle mounted on the tip of the shaft in the rotational direction.

  The present invention provides a nozzle mounting mechanism in which a rear end portion of a nozzle is inserted into a front end portion of a cylindrical shaft and mounted, and a wall portion formed on the inner peripheral surface of the shaft and having a gradually decreasing interval in the rear end direction. A groove portion, an engagement pin projecting from the nozzle engageable with the groove portion, and a rear end portion of the nozzle inserted into the shaft are drawn in the axial direction, and the engagement pin is inserted into the groove portion. The problem is solved by providing the nozzle pull-in means for forcibly contacting the wall.

  In the present invention, the nozzle pull-in means abuts on the bar provided in a shaft orthogonal to the axial direction provided in the rear end portion of the nozzle and in the shaft on the rear end side from the groove portion. You may make it provide the rotation arm which has a possible inclination part, and the urging means which rotates this rotation arm so that the said bar which the inclination part contact | abutted may be drawn in an axial direction.

  According to the present invention, in a state where the engaging pin protruding from the rear end portion of the nozzle is engaged with the groove portion having the wall portion formed in the inner peripheral surface of the shaft and having a gradually decreasing interval in the rear end direction, By forcibly pulling the nozzle in the axial direction of the shaft, the engaging pin can be brought into close contact with the wall portion where the interval is gradually reduced. As a result, the nozzle attached to the tip of the shaft can be reliably restrained in the rotational direction simultaneously with the axial direction.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a cross-sectional view showing a relationship between a shaft and a nozzle mounted by a nozzle mounting mechanism according to an embodiment of the present invention, FIG. 2 is a perspective view showing a relationship between both before mounting, and FIG. 3 is a state of FIG. It is the side view which looked at from the right direction.

  The nozzle mounting mechanism of the present embodiment is mounted on a head unit that is movable in an XY direction by an XY robot (not shown), and the rear end portion of the nozzle 12 at the front end portion (lower end portion in the figure) of the cylindrical shaft 10. (Upper end in the figure) is attached and held.

  The nozzle mounting mechanism includes a groove portion 14 formed on the inner peripheral surface of the shaft 10 and having a slot having a wall portion whose interval gradually decreases in the rear end direction, and a rear portion of the nozzle that can be engaged with the groove portion 14. And an engaging pin 16 projecting from the end 12, and the rear end of the nozzle 12 is pulled in the axial direction of the shaft 10 (upward in the figure), and the engaging pin 16 is Nozzle retracting means, which will be described later in detail, forcibly abutting against the wall portion in the rear end direction of the groove portion 14 is provided.

  The embodiment will be described in detail. At the tip position of the shaft 10, a concave portion that is thin enough to prevent the engagement pin 16 from interfering is formed with a width that reaches the groove portion 14 along the inner periphery. Yes.

  Therefore, in a state where the nozzle 12 is mounted on the shaft 10, the tip of the engagement pin 16 is located outside the inner peripheral surface of the shaft, but the engagement pin 16 interferes with the shaft 10 during insertion. Therefore, the nozzle 12 can be easily mounted.

  Further, the interval between the wall portions constituting the groove portion 14 gradually decreases in the rear end direction, and when viewed from the front, the rear end portion (upper end portion) is formed in a substantially inverted V shape. When it ascends, it finally comes into contact with the left and right wall portions and is positioned at the same time as it is stopped.

  Next, the nozzle retracting means will be described. A beam-like bar 18 is attached to the rear end portion (upper end portion) of the nozzle 12 in a direction orthogonal to the axial direction.

  On the other hand, a rotating shaft 20 orthogonal to the axial direction is attached to the shaft 10 on the rear end side from the groove portion 14, and can be rotated (swinged) in the width direction of the shaft 10 around the rotating shaft 20. The rotating arm 22 is supported on the surface.

  The rear end portion of the rotating arm 22 is urged outward from the shaft center by a spring 24 attached to the inner peripheral surface of the shaft 10, and the distal end portion is urged in the reverse direction. A convex portion 26 protruding inward is formed at the tip portion, and the convex portion 26 has a rear end side inclined portion 26A on the rear end side and a front end side inclined portion 26B on the front end side.

  The rear end side inclined portion 26A abuts on the bar 18 at the time of mounting, and urges the bar 18 upward by the reaction force, thereby drawing the nozzle 12 in the axial direction. That is, the nozzle pulling means is constituted by the bar 18, the rotating arm 22, the rear end side inclined portion 26A, the spring 24, and the like. The tip side inclined portion 26B functions to guide the bar 18 when attached.

  In the above configuration, when the rear end portion of the nozzle 12 is inserted in the axial direction of the shaft 10, the engaging pin 16 is first engaged with the groove portion 14 provided in the vicinity of the front end of the shaft 10 to rotate in the rotational direction. Is moved in the axial direction in a state where the movement of is substantially regulated.

  Next, the bar 18 comes into contact with the tip side inclined portion 26B of the convex portion 26 on the lower end side of the rotating arm 22 biased in the axial center direction by the spring 24, and the rotating arm 22 is biased by the spring 24. The arm 22 is rotated in the reverse direction when it passes through the apex of the convex portion 26, and the bar 18 is biased upward by the action of the rear end side inclined portion 26A. The

  As a result, the nozzle 12 is pulled in the axial direction by the elastic force of the spring 24, and the engaging pin 16 comes into close contact with the wall portion in the rear end direction of the groove portion 14 as shown in FIG. It is certainly restrained.

  According to the embodiment described in detail above, the following effects can be obtained.

(1) The engaging pin 16 protruding from the nozzle 12 is engaged with the groove portion 14 provided in the shaft 10 to which the nozzle 12 is mounted, and comes into contact with the inner wall on the rear end side where the interval is gradually reduced. By doing so, the nozzle 12 can be reliably restrained also in the rotation direction, and even if the shaft is rotated during component mounting, it is possible to prevent a deviation from occurring in the rotation angle of the nozzle.

(2) One end of the rotation arm 22 centering on the rotation axis is compressed by a spring 24, and the bar 18 is attached upward by a pulling slope 26A of the convex portion 26 at the other end using the lever principle. Since the nozzle 12 is retracted into the shaft 10 by energizing, a nozzle mounting mechanism having a relatively simple configuration can be provided.

  The configuration of the nozzle retracting means is not limited to that using the bar 18 and the rotating arm 22 urged by the spring 24, the rear end side inclined portion 26A, etc., as shown in the above embodiment. A method using the steel balls shown in Fig. 5 or other methods may be adopted.

  Further, the groove 14 is not limited to the long hole penetrating to the outer peripheral surface shown in the embodiment, and may be a concave portion formed on the inner peripheral surface that does not penetrate.

Sectional drawing which shows the characteristic at the time of mounting | wearing of the nozzle mounting mechanism of one Embodiment which concerns on this invention. The perspective view which shows the characteristic before mounting | wearing of the said nozzle mounting mechanism. Side view showing characteristics of the nozzle mounting device when mounted Sectional drawing which shows an example of the conventional nozzle mounting apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Shaft 12 ... Nozzle 14 ... Groove part 16 ... Engagement pin 18 ... Bar 20 ... Rotating shaft 22 ... Rotating arm 24 ... Spring 26 ... Convex part 26A ... Rear end side inclined part 26B ... Front end side inclined part

Claims (2)

In the nozzle mounting mechanism for inserting and mounting the rear end of the nozzle at the tip of the cylindrical shaft,
A groove portion formed on the inner peripheral surface of the shaft and having a wall portion whose interval gradually decreases in the rear end direction;
An engaging pin protruding from the nozzle that can be engaged with the groove;
Nozzle comprising means for pulling a rear end portion of the nozzle inserted into the shaft in an axial direction thereof and forcing the engagement pin into contact with the wall portion of the groove portion. Mounting mechanism. The nozzle retracting means,
A bar perpendicular to the axial direction provided at the rear end of the nozzle;
A rotating arm having an inclined portion which is disposed in the shaft on the rear end side from the groove portion and can contact the bar;
The nozzle mounting mechanism according to claim 1, further comprising: an urging unit that rotates the rotating arm so as to pull the bar in contact with the inclined portion in the axial direction.

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