KR20080061787A - Head assembly for chip mounter - Google Patents

Abstract

A head assembly for a chip mounter is provided to stably support a spindle with a gripper during lifting of the spindle, thereby improving the reliability of the head assembly. A platform(110) has a rotation axis(111) rotated by a motor(120) and a plurality of through holes(113) around the rotation axis. A plurality of spindles(130) are inserted into the through holes of the platform to be vertically lifted and have nozzles(135) at lower ends to absorb chips and spindle pressing units at outer sides. A spindle support unit has an upper support unit extended in a circumferential direction to support an upper surface of the spindle pressing unit, a lower support unit extended in a circumferential direction within a predetermined range to support a lower surface of the spindle pressing unit, and a groove unit formed on a lower surface of the upper support unit. An upper selecting unit has an upper gripper protruded outward to be inserted into the groove unit of the spindle support unit, is coupled with the rotation axis to rotate with the rotation axis, and presses the upper surface of the spindle pressing unit downward to lift down the spindle. A lower selecting unit is installed outside the upper selecting unit to vertically move along the upper selecting unit, supports the lower surface of the spindle pressing unit, and has a magnetic body at a lower end. An electromagnet is installed outside the upper selecting unit to face the magnetic body and generates magnetic force against the magnetic body according to an external signal. A lift driving unit(160) is connected to the upper selecting unit and generates vertical driving force to lift up and down the upper selecting unit.

Description

Head assembly for chip mounter

1 is a perspective view of a head for a conventional component mounter.

2 is a perspective view of a head assembly for a component mounter according to an embodiment of the present invention.

FIG. 3 is an enlarged perspective view of a portion A of the head assembly shown in FIG. 2.

4 is an exploded perspective view illustrating a coupling relationship between the rotation shafts of the head assembly illustrated in FIG. 2.

FIG. 5 is an exploded perspective view illustrating a coupling relationship of the spindle lowering parts of the head assembly illustrated in FIG. 2.

FIG. 6 is a perspective view illustrating a state in which the spindle lowering unit illustrated in FIG. 5 is coupled.

7 is a partial side cross-sectional view showing an operating state of the spindle lowering portion shown in FIG.

8 is a partial side cross-sectional view showing an operating state of the spindle lowering portion shown in FIG.

FIG. 9 is a partially enlarged perspective view illustrating an operating state of the head assembly shown in FIG. 2.

FIG. 10 is a conceptual diagram illustrating an operating state in which two spindles are selected in the head assembly shown in FIG. 2.

FIG. 11 is a conceptual diagram illustrating an operating state in which one spindle is selected in the head assembly shown in FIG. 2.

FIG. 12 is a conceptual diagram illustrating an operating state in which the spindle is not selected in the head assembly shown in FIG. 2.

* Explanation of symbols for main parts of the drawings

201: coupling portion 161: lifting drive shaft

158: fixing nut 151: lifting movement transmission unit

113: through hole 136: cylinder

183a: threaded surface 171: compression spring

152b: wing portion 143: groove portion

135: nozzle 191 cylindrical part

193: step 194: magnetic material

120: motor 144: long hole

156: bearing spacing 200: electromagnet

154, 155, 174: bearing 182: first pipe

152: bushing 183: second tube

181: upper gripper 111a: support protrusion

180: upper selector 112: shaft support

141: upper support 121: shaft coupler

123: sensor disk 152a: shaft hole

153: snap ring 170: shock absorber

172: spring retainer 110: platform

132: spindle pressurization portion 131: piston

140: spindle support 192: lower gripper

133: spindle elastic portion 190: lower selection portion

150: spindle lowering 142: lower support

130: spindle 185, 191a: groove

160: elevating drive unit 111: rotary shaft

The present invention relates to a head assembly for a component mounter, and more particularly, to a head assembly for a component mounter in which the configuration of a mechanism for selecting and lifting a nozzle is simplified to reduce the overall size and weight.

A component mounter is a device for mounting electronic components on a printed circuit board (PCB). The component mounter receives various electronic components such as integrated circuits, diodes, capacitors, and resistors from the component supply unit and transfers them to the mounting position of the printed circuit board. Next, mount on the printed circuit board.

In general, a component mounter includes a component supply device for supplying a component, a conveyor for transporting a printed circuit board, a head assembly that includes nozzles to absorb a component from the component supply device and mount the component on a printed circuit board, and the head assembly in a vertical direction. Or a component conveying apparatus for moving in the horizontal direction.

Recently, a technology for adsorbing a plurality of electronic components in sequence or simultaneously and mounting the absorbed electronic components on a printed circuit board in sequence or simultaneously has been developed to improve the efficiency of component mounting. To this end, a conventional component mounter is equipped with a head assembly in which a plurality of nozzle spindles are arranged side by side in a plurality of rows.

1 is a perspective view of a head assembly for a conventional component mounter.

The head assembly 9 installed in the conventional component mounter includes a suction nozzle unit 12, and two rows of lifting shaft members 30 are arranged side by side in the suction nozzle unit 12. A nozzle 38 is coupled to the lower side of the lifting shaft member 30, and the nozzle 38 picks up an electronic component.

The upper frame 15 and the lower frame 16 are fixed to the side of the base portion 11 provided in the head assembly 9, and the nozzle elevating motor 20 is disposed in the vertical direction on the upper surface of the upper frame 15. It is.

In order to raise and lower the lifting shaft member 30, the rotation of the nozzle lifting motor 20 is transmitted to the lifting mechanism 25 provided in the lower direction of the upper frame 15, where the rotation of the nozzle lifting motor 20 is performed. The motion is converted to the vertical motion of the lifting shaft member 30. By individually controlling these nozzle raising and lowering motors 20 by a control part (not shown), many adsorption nozzles of the head assembly 9 can be individually stroke-variably raised and lowered.

As shown in FIG. 1, in order to move up and down each lifting shaft member 30, separate nozzle lifting motors 20 are required, and the control unit must be able to independently control each motor. In addition, the lifting mechanism 25 should also be formed in plurality in correspondence with each lifting shaft member 30. Therefore, the overall weight of the head assembly is increased, which reduces the component mounting speed and increases the load for moving the head assembly. Therefore, high speed mounting and high precision of the component mounter cannot be achieved.

In addition, since the mechanism for raising and lowering each of the lifting shaft members 30 is complicated, the manufacturing cost is increased, and as a result, the cost of electronic components is increased, and the size of the head assembly is increased, so that the head assembly cannot be miniaturized.

The recent trend toward higher speeds has led to an increase in the number of lifting shaft members 30 mounted on the head assembly 9, which causes the above-mentioned problems to become more serious, limiting the number of suction nozzles to be provided in one head assembly.

An object of the present invention is to improve the precision and speed of the mounting operation of the component mounter by providing a head assembly for a component mounter having a plurality of adsorption nozzles are provided in a narrow space and reduced in size and weight.

Another object of the present invention is to provide a head assembly with a simplified configuration of a mechanism for selecting and lowering a nozzle in a head assembly for a component mounter having a plurality of adsorption nozzles.

Still another object of the present invention is to provide a head assembly having an improved function of gripping a nozzle for selecting and raising a nozzle.

According to the present invention, a plurality of spindles having nozzles may be provided in a narrow space, and the head of the component mounter in which the movement of the plurality of spindles in the vertical direction is controlled by one spindle lowering part stably holding the spindles by the action of magnetic force. Provide the assembly.

The head assembly for a component mounter according to the present invention includes a platform including a rotating shaft rotated by a motor and extending upward and a plurality of through holes penetrating in a vertical direction around the rotating shaft, and inserted into the through holes in the vertical direction. It is raised and lowered, and a nozzle for adsorbing or mounting a part is coupled to the outside, and a plurality of spindles protruded from the outside of the spindle press, protrudes outwards and extends in the circumferential direction, and protrudes outward from the upper support for supporting the upper surface of the spindle press. A spindle support fixed to the rotating shaft including a lower support portion extending in a circumferential direction within a predetermined range and supporting a lower surface of the spindle pressing portion and a recess portion formed on a lower surface of a portion of the upper support portion, and protruding outwardly to be inserted into the recess portion; Upper gripper in contact with the upper surface of the spindle press An upper selection part formed at the upper end and moving up and down along the rotation axis from the lower side of the spindle support and coupled to the rotation axis to rotate together with the rotation axis to press the upper surface of the spindle pressurization downward to lower the spindle; It is installed on the outer side of the upper selector to move a predetermined interval to support the lower surface of the spindle press and the lower selector on which the magnetic body is installed, and the outer side of the upper selector so as to face the magnetic body on the lower side of the lower selector. Accordingly, it includes an electromagnet for generating a magnetic force on the magnetic body, and a lift drive unit connected to the upper selection part and generating a driving force in the vertical direction to move the upper selection part in the vertical direction.

In the present invention, the spindle may include a piston which is inserted into the through hole to move up and down in parallel with the axis of rotation, the spindle pressing portion is connected to the piston so as to lower the piston by an external pressing force to project outward, pressurizing the spindle The portion is elastically supported upwards by the spindle elastic portion, and the nozzle can be coupled to the lower end of the piston projecting downward of the platform.

In the present invention, the groove portion may have a clearance in the upward direction that can allow movement of a predetermined interval toward the upper side of the upper gripper.

In the present invention, the lift drive unit is coupled to the lift movement transmission unit coupled to the outside of the upper selector via a bearing to rotatably support the upper selector, thereby allowing the upper selector to slide upward and downward along the rotation axis. .

In the present invention, the lower selection portion is a cylindrical portion coupled to the outside of the upper selection portion to be slidably moved in the vertical direction with respect to the upper selection portion and rotated together with the upper selection portion, and a cylindrical portion at a position corresponding to the upper gripper. Protrudes outward from the upper end and extends within a predetermined range in the circumferential direction to form the same surface as the upper surface of the lower support portion, and to support the lower surface of the spindle pressing portion, and to extend in the circumferential direction from both ends of the lower gripper to contact the lower surface of the lower support portion. It includes a stepped portion formed and the magnetic material may be installed on the lower surface of the lower gripper.

In the present invention, the head assembly for a component mounter may further include a shock absorbing part installed on the rotating shaft above the spindle support part to elastically support the spindle support part to absorb an impact acting on the spindle support part.

In the present invention, the shock absorber may comprise at least one compression spring.

In the present invention, the shock absorber may be a fluid spring in which the compressible fluid is filled.

Hereinafter, with reference to the embodiments of the accompanying drawings, the configuration and operation of the head assembly for a component mounter according to the present invention will be described in detail.

2 is a perspective view of a head assembly for a component mounter according to one embodiment of the present invention, and FIG. 3 is an enlarged perspective view of part A of the head assembly shown in FIG. 2.

The head assembly for component mounting apparatus according to the embodiment shown in FIGS. 2 and 3 includes a platform 110 on which the rotating shaft 111 is mounted, a plurality of spindles 130 protruding downward of the platform 110, and a spindle ( Spindle support 140 for limiting the movement of the vertical direction of the 130, an upper selector 180 for selecting and lowering the spindle 130, and a lower selector 190 installed outside the upper selector 180 ), An electromagnet 200 that exerts a magnetic force on the lower selector 190, and a lift driver 160 that moves the upper selector 180 in a vertical direction. Hereinafter, the upper selector 180, the lower selector 190, and the electromagnet 200 which are interlocked with each other to select and lower the spindle 130 will be referred to as the spindle lowerer 150.

The platform 110 functions to support various components of the head assembly. In addition, the platform 110 is connected to a gantry device (not shown) that moves in the X or Y axis direction, although not shown in the drawings, so that the platform 110 is in the correct horizontal position to pick up or mount the part. Can be moved.

When the printed circuit board is transferred to the mounting position by the conveyor, the head assembly is moved by the gantry device to absorb the components to repeatedly mount the components at a predetermined position of the printed circuit board.

The rotary shaft 111 is rotatably installed on the upper side of the platform 110. The rotating shaft 111 is rotatably supported by the shaft support part 112 formed on the upper surface of the platform 110 and extends upward. The shaft support part 112 in the present embodiment is made of a bearing installed on the upper surface of the platform 110, and rotatably supports the lower end of the rotation shaft 111.

In the platform 110, a plurality of through holes 113 penetrates in the vertical direction around the shaft support part 112. The through hole 113 is a part that functions to support the spindle so that the spindle 130 can move in the vertical direction. The through holes 113 may be disposed on the same circumferential image C based on the axis center of the rotation shaft 111 (see FIG. 10).

Each through hole 113 is provided with a spindle 130. Spindle 130 is a piston 131 is inserted into the through hole 113 to be elevated, and the spindle pressing portion 132 is connected to the upper end of the piston 131 to lower the piston 131 by an external pressing force and The spindle includes a spindle elastic portion 133 for elastically supporting the pressing portion 132 upward, and a nozzle 135 coupled to the lower end of the piston 131.

The piston 131 is slidably coupled in the cylinder 136 coupled to the upper end of the through hole 113. Since the cylinder 136 is parallel to the rotation shaft 111 and extends upward, the piston 131 may be moved in the vertical direction in parallel with the rotation shaft 111.

The lower end of the piston 131 penetrates the through hole 113 and protrudes downward of the platform 110. The nozzle 135 is connected to the lower end of the piston 131 protruding downward of the platform 110. The nozzle 135 may perform a function of picking up or mounting an electronic component using a vacuum pressure.

The upper end of the piston 131 is connected to the spindle pressing portion 132 protruding out of the cylinder 136 and extending in the circumferential direction. The spindle pressing portion 132 is elastically supported upward by the spindle elastic portion 133 installed in the cylinder 136. Although the compression spring is used as the spindle elastic portion 133 of the present embodiment, the elasticity that can return the spindle pressing portion 132, which has been moved downward, to the original position by giving elastic support of the spindle pressing portion 132 to the upper side is provided. You can also use other components to do this.

4 is an exploded perspective view illustrating a coupling relationship between the rotation shafts of the head assembly illustrated in FIG. 2.

The motor 120 is connected to the upper end of the rotating shaft 111 via the shaft coupler 121. Therefore, the rotation shaft 111 may rotate in the forward or reverse direction by the driving force applied by the motor 120.

The position of the axis of rotation 111, ie the angle of rotation, in the head assembly must be accurately controlled. To this end, in the present embodiment, a step motor is employed as the motor 120 driving the rotating shaft 111, and a sensor disk 123 is mounted on the step motor. Therefore, the home position signal of the shaft of the step motor detected by the sensor disk 123 is input to the controller, and the rotation position of the rotation shaft 111 can be accurately controlled based on this. A servo motor having an encoder may be used as the motor 120 driving the rotating shaft 111 by modifying this.

Spindle support 140 is coupled to the rotary shaft 111 rotates integrally with the rotary shaft 111 and functions to limit the movement of the spindle pressing portion 132 in the vertical direction. The spindle support 140 protrudes outward from the top and extends in the circumferential direction, a lower support 142 extending outward from the bottom and extending in a predetermined range in the circumferential direction, and the upper support 141. It includes a recess 143 formed on the lower surface of the partial region.

The spindle support 140 is formed with a long hole 144 extending in the horizontal direction, the cross section of the rotating shaft 111 is formed in a shape corresponding to the long hole 144. In addition, the support shaft 111a protruding outward is formed on the rotation shaft 111. Therefore, when the long hole 144 of the spindle support 140 is coupled to the rotary shaft 111, the spindle support 140 may rotate integrally with the rotary shaft 111, the spindle support 140 by the support protrusion 111a The downward movement of is limited.

The shock absorbing unit 170 may be installed on the rotation shaft 111 on the upper side of the spindle support 140. The shock absorbing unit 170 functions to absorb the impact acting on the spindle support 140 by elastically supporting the spindle support 140 downward.

The shock absorbing portion of this embodiment includes a compression spring 171, a spring retainer 172, and a bearing 174. Reference numeral 173a denotes a retainer ring, and 173b denotes a spacer. Since the compression spring 171 elastically supports the upper surface of the spindle support 140 toward the lower side, the compression spring 171 may absorb the shock transmitted upward by the spindle support 140. Although not shown, the shock absorbing part may be modified to include a fluid spring filled therein with a compressible fluid such as air.

The upper support 141 of the spindle support 140 supports the upper surface of the spindle presser 132. The lower supporter 142 supports the lower surface of the spindle presser 132. A recess 143 is formed on a lower surface of a portion of the upper support 141. The lower support part 142 protrudes outward and extends along the circumferential direction, but the lower support part 142 is not formed in a predetermined area corresponding to the recess 143. The spindle pressing part 132 positioned between the upper support part 141 and the lower support part 142 is limited in the vertical movement.

FIG. 5 is an exploded perspective view illustrating a coupling relationship of the spindle lowering parts of the head assembly illustrated in FIG. 2, and FIG. 6 is a perspective view illustrating a coupled state of the spindle lowering parts illustrated in FIG. 5. 5 and 6 omit other components such as a rotating shaft for convenience of description.

The upper selection portion 180 of the spindle lowering portion 150 is formed in a hollow cylindrical shape. The upper selection unit 180 is slidable up and down along the rotation shaft 111 at the lower side of the spindle support 140 and is coupled to the rotation shaft 111 to rotate together with the rotation shaft 111.

The cross section of the rotary shaft 111 at the position where the upper selection unit 180 is coupled is formed in the shape of a rectangle or an ellipse, and the bushing 152 having the shaft hole 152a corresponding to the cross-sectional shape of the rotary shaft 111 is formed. It is coupled to the rotary shaft 111. The wing 152b formed on the outer side of the bushing 152 is inserted into the side groove 185 of the upper selector 180. Since the upper selector 180 is coupled to the rotary shaft 111 via the bushing 152 having the above configuration, the upper selector 180 integrally rotates together with the rotary shaft 111 and the bushing 152 and rotates together with the bushing 152. It can slide along 111. Bushing 152 is secured in top selector 180 by snap ring 153.

The upper selector 180 is connected to the lift driver 160 by the lift movement transfer unit 151. The lifting movement transmission unit 151 is formed in a cylindrical shape and is rotatably supported by the upper selection unit 180 by being coupled to the outside of the upper selection unit 180 through the bearings 154 and 155. As described above, since the upper selector 180 should be able to rotate integrally with the rotation shaft 111, the upper selector 180 may move with respect to the lifting motion transfer unit 151 with the bearings 154 and 155 therebetween. Combined to rotate. Since the lifting movement transmitting unit 151 is connected to the lifting driving unit 160, the lifting movement transmitting unit 151 is driven by the lifting driving unit 160 and moved along the rotation shaft 111.

The lifting driving unit 160 is a driving source capable of generating a driving force for moving the spindle lowering unit 150 in the vertical direction, and a linear motor may be applied.

The elevating movement transmitting unit 151 is coupled to the outside of the second pipe unit 183 formed at the lower portion of the upper selecting unit 180, and is disposed between the elevating movement transmitting unit 151 and the upper selecting unit 180. There are two bearings 154 and 155 and a bearing gap 156 disposed between the bearings 154 and 155. The screw surface 183a formed at the lower end of the second pipe part 183 protrudes to the lower end of the lifting movement transmission part 151 and is connected to the fixing nut 158. Therefore, when the upper selection unit 180 rotates together with the rotation shaft 111, the upper selection unit 180 is moved to the lifting movement transmission unit 151 fixed by the action of the bearings 154 and 155 in the rotational direction. Rotational motion relative to the

An upper gripper 181 protrudes outwardly to be inserted into the recess 143 of the spindle support 140 at the upper end of the upper selector 180, and is in contact with the upper surface of the spindle presser 132. Selection of the spindle 130 to be lowered is made by the upper gripper 181 contacting the upper surface of the spindle presser 132. In this state, when the upper selector 180 is lowered, the selected spindle 130 is also lowered. Can be.

The selection of the spindle 130 to be lowered is made by rotating the upper selection unit 180 together with the rotation shaft 111. If the upper gripper 181 is in contact with the upper surface of the spindle presser 132 when the upper selector 180 rotates, friction may occur to resist rotation of the upper selector 180. Rotation of the upper selector 180 may be performed after a predetermined interval is spaced upward from the upper surface of the spindle presser 132. To this end, the groove 143 formed on the lower surface of the upper support 141 is formed with a clearance in the upper direction to allow movement of a predetermined interval toward the upper side of the upper gripper 181.

As described above, the operation of picking up or mounting the electronic component may be performed by the upper gripper 181 by pressing the upper surface of the spindle presser 132 to lower the spindle 130. Can be. However, due to the characteristics of the component mounter operating at a high speed, the spindle 130 may vibrate due to the action of inertia at the moment when the spindle 130 descends and stops by the elevating drive unit 160, resulting in inaccurate position.

In order to prevent such a phenomenon from occurring, the lower selector 190 is installed outside the upper selector 180. Since the lower selector 190 supports the lower surface of the spindle presser 132, the lower selector 190 and the upper selector 180 may hold the spindle presser 132 together.

 The lower selector 190 is coupled to the outside of the upper selector 180 so as to rotate integrally with the upper selector 180 and to slide sliding up and down a predetermined interval along the upper selector 180.

The lower selection unit 190 includes a cylindrical portion 191, a lower gripper 192 protruding outward from an upper end of the cylindrical portion 191, a stepped portion 193 formed at both ends of the lower gripper 192, and The magnetic material 194 is installed on the lower surface of the lower gripper 192.

Cylindrical portion 191 is made of a hollow cylindrical shape, is coupled to the outer side of the upper selection unit 180 to be able to slide a predetermined interval in the vertical direction with respect to the upper selection unit 180. Since the groove 191a into which the wing portion 152b of the bushing 152 described above is inserted is formed at the side of the cylindrical portion 191, the cylindrical portion 191 and the upper selection portion 180 are formed by the bushing 152. ) Are connected to each other and can be rotated integrally.

The cylindrical portion 191 is coupled to the outside of the first tube portion 182 of the upper selection unit 180, the height h of the first tube portion 182 is formed larger than the height H of the cylindrical portion 191 (h> H). Since the inner diameter of the cylindrical portion 191 corresponds to the outer diameter of the first tube portion 182, the cylindrical portion 191 may move in the vertical direction with respect to the first tube portion 182 within a predetermined interval h-H.

A lower gripper 192 is formed at an upper end of the cylindrical portion 191 to protrude outward from a position corresponding to the upper gripper 181 of the upper selector 180 and extend within a predetermined range in the circumferential direction. The lower gripper 192 forms the same surface as the upper surface of the lower supporter 142 of the spindle supporter 140 and functions to support the lower surface of the spindle presser 132. Stepped portions 193 are formed at both ends of the lower gripper 192 and extend in the circumferential direction. The lower surface of the lower support part 142 is in contact with the stepped portion 193 and is seated.

The magnetic body 194 is installed on the lower surface of the lower gripper 192. The magnetic body 194 functions to cause the lower selection unit 190 to be moved by the magnetic force applied by the electromagnet 200 to be described later. The magnetic body 194 may be a permanent magnet.

The electromagnet 200 is installed at an outer side of the upper selection unit 180 below the lower selection unit 190. The electromagnet 200 is installed at a position opposite to the above-described magnetic body 194 on the outer circumferential surface of the shaft coupling portion 201 inserted outside the upper selection portion 180. The electromagnet 200 is fixed relative to the upper selector 180.

The electromagnet 200 receives a control signal from the outside to act or release the magnetic force. When the controller (not shown) supplies a control signal to the electromagnet 200 and the electromagnet 200 exerts a magnetic force on the magnetic body 194, the lower selector 190 moves up and down along the upper selector 180. I can move it. As a result, the upper selector 180 and the lower selector 190 may perform operations such as holding the spindle presser 132 or releasing the grip.

Referring to the operation of the head assembly for a component mounter having the above configuration is as follows.

FIG. 7 is a partial side cross-sectional view illustrating an operating state of the spindle lowering part illustrated in FIG. 5, in which only the upper selector 180 supports the spindle presser 132.

In this state, the lower selector 190 is moved downward with respect to the upper selector 180 by its own weight. In this state, the upper end of the first pipe part 182 of the upper selector 180 is positioned higher than the upper end of the stepped portion 193 of the lower selector 190.

In order to select the spindle to be lowered, the upper selector 180 may move further upward by a predetermined distance from the lower selector 190 from the state as shown in FIG. 7. To this end, the clearance in the upper direction is formed in the groove 143 formed on the lower surface of the upper support 141 to allow movement of a predetermined interval toward the upper side of the upper gripper 181. The upper gripper 181 of the upper selector 180 is inserted into the clearance formed in the recess 143 and moves upward.

To this end, when the elevating drive unit 160 generates a driving force in an upward direction, the elevating motion transmission unit 151 connected to the elevating drive shaft 161 moves upward. When the lifting movement transmission unit 151 moves upward, the lower selection unit 190 and the upper selection unit 180 also move upward. Referring to FIG. 7, the lower selector 190 is moved downward with respect to the upper selector 180 by its own weight so that the lower selector 190 is also spaced apart from the lower surface of the spindle presser 132 by a predetermined interval. By moving the upper selector 180 upward by a distance smaller than this interval, both the upper selector 180 and the lower selector 190 may be in a state of not contacting the spindle presser 132.

Therefore, when the upper selection unit 180 is moved upward, and the upper gripper 181 is inserted at the clearance of the recess 143, the spindle lowering unit 150 may freely rotate by the rotation shaft 111. The controller (not shown) rotates the rotary shaft 111 by a predetermined angle by driving the motor 120 to thereby rotate the spindle 130, ie, the spindle presser 132, on which the upper gripper 181 and the lower gripper 192 are to be lowered. Choose.

When the upper selector 180 further moves upward, the upper gripper 181 is spaced upward from the spindle presser 132 so that the spindle lowering part 150 may rotate freely. As described above, as the rotating shaft 111 rotates, the spindle lowering part 150 also rotates integrally with the spindle support part 140. When the spindle lowering unit 150 rotates and the spindle 130 to be lowered is selected, the upper selecting unit 180 lowers again and returns to the state shown in FIG. 7.

FIG. 8 is a partial side cross-sectional view showing the operating state of the spindle lowering portion shown in FIG. 5 and showing the operating state of gripping the spindle pressing portion 132 selected by the upper selection portion 180 in FIG. 7.

When a control signal is input to the electromagnet 200 from the outside, the electromagnet 200 exerts a magnetic force on the magnetic body 194. When the magnetic body 194 is a permanent magnet, the lower selection unit 190 moves to the state shown in FIG. 8 when the electromagnet 200 exerts a magnetic force having a polarity opposite to that of the lower surface of the magnetic body 194. Since the lower selector 190 may slide in an upward and downward direction from the outside of the upper selector 180, when the magnetic body 194 receives an upward force by the magnetic force, the lower selector 190 overcomes its own weight. Can move upwards. In this state, the interval maintained between the upper gripper 181 and the lower gripper 192 is the same as the thickness of the spindle presser 132, so that the spindle lowering part 150 may stably support the spindle presser 132. Can be.

9 is a partially enlarged perspective view illustrating an operating state of the head assembly shown in FIG. 2, in which the spindle lowering part lowers the selected spindle.

As described above, the rotary shaft 111 is rotated in the state where the upper selection unit 180 is moved upward to move the upper gripper 181 and the lower gripper 192 to the position of the selected spindle 130 and then pressurize the spindle. When the gripping portion 132 is gripped, the lifting driving unit 160 generates the driving force in the downward direction, thereby lowering the upper selection unit 180 to the height shown in FIG. 9. In order to lower the spindle 130 to a height for picking up or mounting an electronic component, the lifting driving unit 160 generates a driving force directed downward. Then, as the spindle lowering part 150 moves downward, the spindle 130 selected by the upper gripper 181 and the lower gripper 192 moves downward together.

When the electronic component is picked up or mounted by the nozzle 135 positioned at the lower end of the spindle 130, the lifting driving unit 160 generates a driving force upward, and the spindle lowering unit 150 returns to its original position.

When the spindle lowering part 150 moves upward, the spindle pressing part 132 is maintained at a position stopped by the spindle support part 140 and the spindle lowering part 150. In this state, in order to newly select the spindle 130 to be lowered again, the state in which the spindle pressing part 132 is gripped between the upper gripper 181 and the lower gripper 192 should be released. For this purpose, the operation of the description given in connection with FIGS. 7 and 8 is repeated as described above.

FIG. 10 is a conceptual diagram illustrating an operating state in which two spindles are selected in the head assembly illustrated in FIG. 2, and FIG. 11 is a conceptual diagram illustrating an operating state in which one spindle is selected in the head assembly illustrated in FIG. 2. 2 is a conceptual diagram illustrating an operating state in which the spindle is not selected in the head assembly shown in FIG. 2. 10 to 12 show the positional relationship between the spindle pressing portion selected by the upper gripper, the upper gripper, and the gripper pins.

In FIG. 10, two spindle presses 132 are selected. The upper surface of the spindle presses 132 is supported by the upper gripper 181, and the lower surface is respectively supported by the lower gripper 192.

When only one spindle pressing portion 132 is to be selected, the rotation shaft 111 rotates to change the positions of the spindle support 140 and the spindle lowering portion 150 to the positions shown in FIG. 11. At this time, the remaining spindle presses 132 not selected at this time are supported by the spindle support 140, thereby limiting the movement in the up and down direction.

If one spindle 130 is not selected, the rotation axis 111 rotates to change the position of the upper gripper 181 to the position of FIG. 12 that does not contact any spindle presser 132.

Although the present invention has been described with reference to the above-described embodiments, these are merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the appended claims.

The head assembly for a component mounter of the present invention as described above is provided with a plurality of spindles having nozzles in a narrow space and the movement of the up and down direction can be controlled by one spindle lowering portion, thereby increasing the overall size and weight of the head assembly. Can be reduced. This has the effect of improving the precision and speed of the mounting work of the component mounter.

In addition, the configuration of the spindle lowering portion for selecting and lifting the spindle having the nozzle can be simplified.

In addition, since the spindle is stably supported by a gripper acted by an electromagnet even while the spindle having the nozzle is selected and lowered, the reliability of the head assembly for the component mounter is improved.

Claims (8)

A platform including a rotating shaft rotated by a motor and extending upward, and a plurality of through holes penetrating in the vertical direction around the rotating shaft; A plurality of spindles inserted into the through-holes to be moved up and down, and coupled to a lower end thereof with a nozzle for adsorbing or mounting a part, and having a spindle pressurizing portion protruding from the outside; An upper support portion protruding outward and extending in the circumferential direction to support the upper surface of the spindle pressing portion, a lower support portion protruding outward and extending within a predetermined range in the circumferential direction to support the lower surface of the spindle pressing portion, and the upper support portion A spindle support portion fixed to the rotation shaft, including a recess portion formed on a lower surface of the partial region; An upper gripper protruding outwardly to be inserted into the groove portion is in contact with the upper surface of the spindle pressing portion is formed at the upper end, and is coupled to the rotating shaft to move up and down along the rotating shaft from the lower side of the spindle support and to rotate together with the rotating shaft. An upper selector configured to press the upper surface of the spindle presser toward the lower side to lower the spindle; A lower selection part installed at an outer side of the upper selection part to move up and down a predetermined interval along the upper selection part, supporting a lower surface of the spindle pressing part, and having a magnetic material installed at a lower end thereof; An electromagnet installed at an outer side of the upper selection part to face the magnetic material at the lower side of the lower selection part, the electromagnet generating magnetic force with respect to the magnetic material according to an external input signal; And And a lift drive unit connected to the upper selection unit and generating a driving force in a vertical direction to move the upper selection unit in a vertical direction. The method of claim 1, The spindle includes a piston inserted into the through hole to move up and down in parallel with the rotation axis, the spindle pressing portion is connected to the piston to protrude outward to lower the piston by an external pressing force, the spindle press The part is elastically supported in an upward direction by a spindle elastic part, and the nozzle is coupled to the lower end of the piston protruding downward of the platform. The method according to claim 1 or 2, The recess portion head assembly for a component mounter having a clearance in the upper direction that can allow movement of a predetermined interval toward the upper side of the upper gripper. The method according to claim 1 or 2, The elevating drive unit is coupled to an outer side of the upper selector via a bearing, and is connected to an elevating motion transmission unit rotatably supporting the upper selector, thereby mounting the component to move the upper selector in the vertical direction along the rotation axis. Head assembly. The method according to claim 1 or 2, The lower selection unit, A cylindrical portion coupled to an outer side of the upper selection part to be slidably moved in a vertical direction with respect to the upper selection part and to rotate together with the upper selection part; A lower gripper which protrudes outward from an upper end of the cylindrical portion at a position corresponding to the upper gripper and extends within a predetermined range in a circumferential direction, forming a same surface as an upper surface of the lower support portion and supporting a lower surface of the spindle pressing portion; And It includes a step portion extending in the circumferential direction from both ends of the lower gripper to contact the lower surface of the lower support, The magnetic body is a component assembly head assembly is installed on the lower surface of the lower gripper. The method according to claim 1 or 2, The head assembly for the component mounter, And a shock absorbing part installed on the rotating shaft above the spindle support part to absorb the impact acting on the spindle support part by elastically supporting the spindle support part. The method of claim 6, The shock absorber is a component assembly head assembly comprising at least one compression spring. The method of claim 6, And the shock absorbing part is a fluid spring filled with a compressible fluid therein.

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