JPH0810796B2 - Suction head of chip component mounting device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction head of a chip component mounting apparatus for automatically mounting chip electronic components arranged in a component supply unit on a printed circuit board. It is effective when applied to a suction head of a transfer device that moves a small component from a supply unit to another predetermined position.

[0002]

2. Description of the Related Art On a conveyor for intermittently carrying a printed circuit board, a head supporting section for moving at high speed in the X-axis and Y-axis directions in a horizontal plane parallel to the conveyor is provided, and chips arranged in a component supply section. 2. Description of the Related Art There is known a chip component mounting apparatus in which a suction head that sucks a component and transfers it to a predetermined position on a printed circuit board in a predetermined direction is provided on the head support portion. The suction head includes a suction nozzle that sucks a chip component, and a plurality of correction arms that sandwich the chip component that is sucked by the suction nozzle to position the chip component with respect to the suction nozzle. A link-type opening / closing mechanism for opening / closing in cooperation with each other is added. Further, the raising / lowering operation of the suction nozzle and the opening / closing operation of the correction arm are sequence operations according to a predetermined procedure. In this conventional technique, a drive unit for moving the suction nozzle up and down and a drive unit for opening / closing the correction arm are respectively provided. They are provided and controlled by program control of a microcomputer to perform the above sequence operation. In the above conventional technology, since the opening / closing mechanism is a link type, the link mechanism projects outward in the radial direction of the suction heads. Therefore, when a plurality of suction heads are arranged, suction is performed in order to avoid mutual interference of the suction heads. Inevitably, the head interval must be increased, and the head support portion is accordingly increased in size, making it difficult to reduce the weight.

[0003]

By the way, the head support moves along the guide rail in the X-axis and Y-axis directions at high speed to move the suction head to a predetermined position on the printed circuit board. In order to increase the operating speed and improve the accuracy of the stop position, it is necessary to reduce the inertia of the head supporting portion, that is, reduce the weight of the head supporting portion. The weight of the suction head is significantly reduced by reducing the weight of the head support. Therefore, in order to meet the above requirements, it is effective to simplify and reduce the weight of the suction head drive mechanism and the correction arm drive mechanism. is there. Furthermore, to simplify the sequence control between the suction head drive unit and the correction arm drive unit to speed up and facilitate the sequence operation of the lifting and lowering operation of the suction nozzle and the opening and closing operation of the correction arm, and both drive units. It is necessary to reduce the cost of the control device. In order to meet this demand, it is effective to drive the suction head and the correction arm by a single drive unit. In order to meet both of the above requirements, the present invention simplifies and reduces the weight of the suction head drive mechanism and the correction arm drive mechanism, and drives the suction head and the correction arm by a single drive unit. The task is to do so.

[0004]

Means taken for solving the problems Means taken for solving the above problems are constituted by the following elements (a) to (d). (A) The inner shaft having a suction nozzle at the lower end and the outer shaft having a cam surface at the lower end for opening and closing the correction arm are concentric so that both shafts can move up and down and vertically with respect to the suction head body. (B) The drive piston fixed to the outer shaft was fitted in the support hole of the suction head main body so that it could move up and down in the cylinder of the suction head main body, and (c) the inner shaft of the outer shaft. A first stopper that restricts the downward movement of the inner shaft is provided at the lower end of the inner shaft, and a second stopper that restricts the vertical stroke of the inner shaft is provided between the suction head body and the upper end of the inner shaft. A return spring that urges is provided between the upper end of the outer shaft and the upper end of the inner shaft.

[0005]

[Operation] When the outer shaft is lowered by the drive piston, the initial arm causes the cam surface at the lower end to expand the correction arm, and then the lower end surface of the outer shaft abuts the first stopper at the lower end of the inner shaft and Lower the shaft. The inner shaft descends to a position regulated by a second stopper provided between the suction head body and the upper end of the inner shaft. Due to this lowering, the suction nozzle at the tip of the inner shaft comes into contact with the chip component and the chip component is sucked by the suction nozzle. It After attracting the chip component to the suction nozzle, the drive piston is raised and the outer shaft starts to rise. In the first half of this raising operation, since the inner shaft is biased upward by the return spring, it is raised together with the outer shaft to the regulated position by the second stopper provided between the suction head body and the upper end of the inner shaft. After that, only the outer shaft continues to move upward while compressing the return spring, and the cam surface at the lower end thereof is disengaged from the correction arm. As a result, the correction arm is closed and the chip component sucked by the suction nozzle is moved to the center of the nozzle and firmly held at that position. After moving the head support to a predetermined position, the drive piston is lowered again. In this case, the operation is similar to the above case. That is, in the initial stage of the lowering operation of the outer shaft, only the outer shaft descends to release the correction arm from gripping the chip component, and the tip of the outer shaft lowers the inner shaft through the first stopper at the lower end of the inner shaft. The chip component sucked by the suction nozzle at the tip is placed on the printed board, and then the chip component is released from the nozzle. As described above, the outer piston and the inner shaft can be mechanically interlocked and sequentially actuated by a single piston incorporated in the suction head main body, so that the movement of the drive piston can be performed on the outer shaft and the inner shaft. No transmission mechanism is required for transmission, and only one drive piston is required. Therefore, the drive mechanism for moving up and down the suction nozzle and the drive mechanism for opening and closing the correction arm are extremely simplified, made compact, and lightweight, and the control for controlling the series of operations described above controls the vertical movement of one piston. Since it is extremely simple to control, the manufacturing cost of the control device is significantly reduced.

[0006]

EXAMPLES The present invention will be described below based on an example shown in the drawings. FIG. 11 shows a side surface of the apparatus, and a conveyor 2 as a transfer path is horizontally installed on the upper surface of the cabinet 1. The printed circuit board 3 is conveyed onto the conveyor 2 from one side thereof, and the feeding of the conveyor 2 is temporarily stopped when the printed circuit board 3 reaches the chip component mounting position P ₁ . A frame 4 is arranged above the conveyor 2, and the frame 4 is guided by guide rails 5 and 5 which are orthogonal to the conveyor 2 and in a horizontal plane parallel to the conveyor 2 in a direction orthogonal to the conveyor 2, that is, Y Is reciprocated in the direction. A lead screw 6 parallel to the guide rails 5 and 5 meshes with one end of the frame 4, and the lead screw 6 is rotated by a motor 7 to feed the frame 4 in the Y direction. To be
A head support portion 8 is supported by the frame 4, and the head support portion 8 is guided by a guide rail 9 along the conveyor 2 and reciprocates in the X direction along the feeding direction of the conveyor 2. A lead screw 10 parallel to the guide rail 9 is engaged with the head support portion 8.
By rotating 0 with the motor 11, the head support 8 is fed in the X direction. Therefore, the head supporting portion 8 is moved to an arbitrary position in the horizontal plane parallel to the conveyor 2 together with the feeding of the frame 4 in the Y direction.
On the other hand, a component supply unit 12 is provided on the cabinet 1 on both sides of the conveyor 2 in between. The component supply unit 12 of this embodiment includes a chip component 14 having a rectangular parallelepiped shape on the adhesive tape 13 wound around a reel.
Are arranged at equal intervals, and a ratchet type feeding mechanism 16 for intermittently feeding the adhesive tape 13 is incorporated at the feeding end of the adhesive tape 13 as shown in FIG. The feed mechanism 16 is a ratchet wheel 17 and this ratchet wheel 17
An input wheel 19 having a hook 18 hooked at the front is provided, and the above-mentioned hook wheel 17 is rotated integrally with a feed wheel (not shown) that meshes with the feed hole of the adhesive tape 13. And the input vehicle 19
Is rotated by a certain angle in the direction of arrow A by pushing the push rod 20 downward, and then the spring 2
1 is pulled back, and at this time, the pawl 18 is moved to the pawl wheel 17
Is rotated by a certain angle in the direction of arrow B. By the rotation of the ratchet wheel 17, the adhesive tape 13 is fed out at a constant pitch, and the chip component 14 at the tip portion thereof is sucked at the suction position P _2.
It is located in. By the way, the head support portion 8 is provided with three suction heads 22. The suction head 22 transfers the chip component 14 located at the suction position P ₂ to a predetermined position on the printed circuit board 3 at the chip component mounting position P ₁ , and the details of the suction head 22 will be described below. A description will be given with reference to FIGS. That is, reference numeral 2 in the drawing
Reference numeral 3 denotes a head main body, which is supported by the head support portion 8. A cylinder 24 and a mounting hole 25 having a diameter larger than that of the cylinder 24 are coaxially formed in the head main body 23 along the vertical direction, and the upper end opening of the cylinder 24 is closed on the upper surface of the head main body 23. A lid member 26 is attached, and an intermediate member 27 that closes the lower end opening of the cylinder 24 is fitted in the mounting hole 25. Mounting hole 2
A cylindrical guide 30 is coaxially supported inside the shaft 5 through a sleeve 28 and a bearing 29.
The lower end of 0 is led out below the mounting hole 25. A hollow shaft component 31 is coaxially inserted into the cylinder 24 and the guide 30. The shaft part 31 has a double structure in which an outer shaft 32 and an inner shaft 33 are fitted so as to be slidable in the axial direction, and a vacuum passage 34 is formed in the inner shaft 33 along the axial direction. There is. The upper end of the shaft part 31 penetrates the end member 26 and is led out upward, and the inner shaft 3
The upper end of 3 projects above the outer shaft 32, and an end cap 36 is fitted to the upper end of the inner shaft 33 via a bearing 35. The vacuum passage 34 in the inner shaft 33 is connected to a vacuum pump 39 via a hose 37 connected to the end cap 36 and a communication passage 38 in the head body 23. Further, the lower end of the inner shaft 33 is led out below the outer shaft 32, and the outer shaft 32 has an outer periphery at a position axially separated from the lower end surface of the outer shaft 32 by a distance L ₁ from the lower end face of the outer shaft 32. A rubber damper (first stopper) 40 with which the lower end of 32 abuts is fixed. An adsorption nozzle 41 that adsorbs the chip component 14 is mounted in the lower end opening of the vacuum passage 34 that opens to the lower end surface of the inner shaft 33. The adsorption nozzle 41 moves up and down in the axial direction via a coil spring 42. When the size and shape of the chip part 14 are changed by being fitted as much as possible, the height change can be absorbed. On the outer periphery of the outer shaft 32,
A piston 45 that partitions the inside of the cylinder 24 into an upper chamber 43 and a lower chamber 44 is attached. The upper chamber 43 and the lower chamber 44 are connected to air pumps 46, 46 via air supply passages 47, 47, respectively.
Alternatively, by switching the air supply to the lower chamber 44,
The outer shaft 32 is moved up and down together with the piston 45.
Further, the bracket 50 provided on the end cap 36 includes
Two guide shafts 51, 51 that guide the up-and-down movement of the inner shaft 33 are connected. Guide shaft 5
Reference numerals 1 and 51 extend slidably through the head main body 23 and extend below the shaft component 31, and one lower end portion of the feed mechanism is a feed mechanism when the suction head 22 is positioned at the suction position P _2. Opposed to 16 push rods 20. The inner shaft 33 and the guide shafts 51, 51
Are urged upward through the return spring 52.
An adjusting screw 53 for stroke adjustment is screwed into the end member 26 through which the shaft component 31 penetrates. The upper part of the adjusting screw 53 penetrates the bracket 50 in the vertical direction.
A second stopper 54 for restricting the stroke amount of 1, 51,
55 is attached. The stopper 55 that abuts the lower surface of the bracket 50 is provided at a position separated from the lower surface by a distance L ₂ . Therefore, the inner shaft 33 is
When the lower end portion of the outer shaft 32 comes into contact with the damper (first stopper) 40, the descent is started integrally with the outer shaft 32, and the outer shaft 32 and the piston 45
The stroke amount L is L ₁ + L ₂ . Further, the outer peripheral surfaces of the outer shaft 32 and the inner shaft 33 have guides 3
The portion that penetrates 0 is notched flat, and the flat surfaces 32a and 33a of both shafts 32 and 33 are the same flat surface as shown in FIG. A detent pin 57 that is in rolling contact with the flat surfaces 32a and 33a is axially supported by the guide 30, and the detent pin 57 causes the guide 30, the outer shaft 32, and the inner shaft 33 to move in the axial direction. While being relatively slidable, they are connected so as to be integrally rotatable in the direction around the axis. A piston rod 63 of an air cylinder 62 is connected to an outer peripheral portion of the guide 30 via a joint 60, and the guide 30, the outer shaft 32, and the inner shaft 33 move in the axial direction by the protrusion and retraction of the piston rod 63. For example, they are integrally rotated within a range of 90 °. By the way, at the lower end of the guide 30, four correction arms 63a, 63b and 64a, 64b for positioning the chip component 14 sucked by the suction nozzle 41 are arranged at equal intervals in the circumferential direction. There is. These correction arms 63
a, 63b and 64a, 64b are two sets facing each other in the radial direction, and the upper end of the a, 63b and 64a, 64b enter into the slits 65 ... Formed in the lower end of the guide 30 and through the pivot 66. The guide 30 is supported so as to be rotatable in the radial direction. Then, the correction arms 63a, 63b, 64
A holding piece 67 for holding two opposite surfaces of the chip component 14 is fixed to the lower end portions of the a and 64b, and a lever portion 68 projecting radially outward from the guide 30 is provided at the upper end portion. Are integrally formed. Such correction arms 63a, 63b, 64a, 64b are positioned so as to surround the outer side of the shaft component 31, and the outer shaft 32 descends on the surfaces facing each other with the shaft component 31 interposed therebetween. A cam 69 is provided so as to project from the outer peripheral surface of the lower end portion of the outer shaft 32. The cam 69 projects inward as it goes downward, and the lower ends of the correction arms 63a, 63b, 64a, 64b expand radially outward in accordance with the shape of the cam 69. Further, on the outer peripheral surface of the lower end portion of the guide 30, the correction arms 63a and 6a are provided.
Sleeve 7 for urging 3b, 64a, 64b in the closing direction
0 is fitted so as to be slidable in the axial direction. The sleeve 70 of the present embodiment has a double structure of an inner sleeve 71 that interlocks the correction arms 63a and 63b of one set and an outer sleeve 72 that interlocks the correction arms 64a and 64b of the other set. 71 and 72 are return springs 73
Is urged downward by the lower end portion of the lever portion 68 to abut. In this case, the inner sleeve 71
The lower end of the outer sleeve 72 is formed with a recess 74 for avoiding interference with the lever portion 68 of the correction arms 64a, 64b of the other set, and the lower end of the outer sleeve 72 has one set of correction arms. A concave portion 75 is formed to avoid interference with the lever portion 68 of the 63a and 63b. Therefore, the correction arms 63a and 63b and 64a and 64b are
Each group is independently biased in the closing direction. It should be noted that each of the correction arms 63a, 63b, 64a, 64b is provided with a damper 80 that comes into contact with the outer periphery of the lower end portion of the inner shaft 33 when these are closed. The damper 80 includes correction arms 63a, 63b, 64a,
It is mounted slidably in the opening / closing direction of 64b, and the damper 80 absorbs and relaxes the shock when the holding piece 67 holds the chip component 14. In such a configuration, when the suction head 22 stops at the suction position P ₂ due to the movement of the head support portion 8 in the XY directions, air is supplied to the upper chamber 43 through the air pump 46, and the outer shaft 32 and the guide shaft 51. , 51 starts descending. Due to this lowering, the outer peripheral surface of the outer shaft 32 comes into contact with the cam 69, and as shown in FIG.
63b, 64a, 64b start to open against the biasing force of the sleeves 71, 72. When the outer shaft 32 contacts the damper (first stopper) 40, the inner shaft 3
3 also starts descending integrally, and the suction nozzle 41 holds the gripping piece 67.
One of the guide shafts 5 protrudes downward from the space
1 pushes the push rod 20 and operates the feed mechanism 16 so as to feed the tip 14 to the suction position P ₂ as the guide shaft 51 moves up. When the inner shaft 33 is stroked to the lowest position and the suction nozzle 41 sucks the upper surface of the chip component 14, the inside of the upper chamber 43 is exhausted, and at the same time, the air is supplied from the air pump 46 into the lower chamber 44. It As a result, the outer shaft 3
2, the inner shaft 33 also rises by the return spring 52, and the chip component 14 is picked up from the adhesive tape 13. In this case, the correction arms 63a, 63b, 64a, 64b are the sleeve 7
When the outer shaft 32 moves up, the correction arms 63a, 63b,
64a and 64b gradually start to close depending on the shape of the cam 69. When the holding pieces 67 sandwich the side surfaces of the chip component 14 from the directions orthogonal to each other, the width and the longitudinal direction of the chip component 14 are aligned with the suction nozzle 41, that is, centering is performed. Then, the head support portion 8 is again moved to X
When the suction head 22 that has moved in the Y direction and suctioned the chip component 14 is stopped at a predetermined position on the printed circuit board 3 at the chip component mounting position P ₁ , the air cylinder 62 is pressed.
The suction nozzle 41 and the correction arms 63a, 63b,
64a and 64b are integrally rotated within the range of 90 °, and the mounting direction of the chip component 14 is selected. Subsequently, when the air is supplied to the upper chamber 43 at the same time as the exhaust of the lower chamber 44 and the shaft component 31 starts descending, the correction arms 63a, 63b, 64a, 64b start to open again, and as shown in FIG. The chip component 14 sucked by the nozzle 41 is placed at a predetermined position on the printed circuit board 3. Then, after this, the suction of the chip component 14 is released, and the mounting on the printed circuit board 3 is completed. Note that reference numeral B in FIG. 7 indicates an adhesive agent for fixing the chip component 14.

[0007]

[Effect] The above-mentioned object of the present invention is novel. Therefore, by solving this problem, the suction head drive mechanism and the correction arm drive mechanism can be simplified and reduced in weight, and the suction head and the correction arm can be driven by a single drive unit. The start and stop operations of the head support can be performed quickly and smoothly, the accuracy of the stop position can be improved, and the sequence control of the suction head drive unit and the correction arm drive unit can be performed by one drive piston. Since it can be performed by a simple control such as the ascending / descending control, which does not require the program control, the maximum peculiar effect of the present invention is that the moving speed of the head supporting portion can be increased to significantly improve its operating efficiency. Further, as the weight of the head support portion is reduced, the drive mechanism and the braking mechanism for driving the head support portion in the X-axis and Y-axis directions can be downsized, and further, the suction head drive mechanism and the correction arm. The drive portion of the drive mechanism is a single drive piston, and by incorporating it into the suction head body, these drive mechanisms are simplified and the manufacturing cost thereof is significantly reduced. Further, since the suction head drive mechanism and the correction arm drive mechanism are directly driven by the drive piston without using a mechanism such as a link, they will not be worn and loose during use. Therefore, the durability of these drive mechanisms is improved, and the accuracy and reliability of operation are guaranteed for a long time.

[Brief description of drawings]

FIG. 1 is a sectional view of a suction head.

FIG. 2 is a side view of a suction head.

FIG. 3 is a cross-sectional view showing the suction nozzle and the periphery of a correction arm in an enlarged manner.

FIG. 4 is a view seen from the direction of the line U in FIG.

FIG. 5 is a perspective view around a correction arm.

6 is a cross-sectional view taken along the line VV in FIG.

FIG. 7 is a cross-sectional view showing a state in which the suction nozzle is most lowered.

FIG. 8 is a cross-sectional view showing a positioning state of a chip component.

9 is a view seen from the direction of the line W in FIG.

FIG. 10 is a plan view of the entire device.

FIG. 11 is a side view of the entire apparatus.

[Explanation of symbols]

 2 ... Transport path (conveyor) 3 ... Board (printed circuit board) 8 ... Head support section 12 ... Component supply section 14 ... Chip component 22 ... Suction head 30 ... Guide 31・ ・ ・ Shaft component 41 ・ ・ ・ Suction nozzle 63a, 63b, 64a, 64b ・ ・ ・ Correcting arm 68 ・ ・ ・ Lever part 69 ・ ・ ・ Cam 70 ・ ・ ・ Sleeve

Claims (1)

[Claims] 1. An inner shaft having a suction nozzle at its lower end and an outer shaft having a cam surface at its lower end for opening and closing a correction arm are concentric with each other, and both shafts are vertically movable relative to each other and vertically movable with respect to a suction head body. Firstly, the drive piston fixed to the outer shaft is freely fitted into and held in the support hole of the suction head body, and the drive piston fixed to the cylinder of the suction head body is vertically movable so that the downward movement of the outer shaft with respect to the inner shaft is restricted. A stopper is provided at the lower end of the inner shaft, and a second stopper that regulates the vertical stroke of the inner shaft is provided between the suction head body and the upper end of the inner shaft, and a return spring that biases the inner shaft upward is provided between the upper end of the outer shaft and the upper end of the inner shaft. The outer shaft is lowered by the piston to expand the correction arm, and the correction arm is expanded. The inner shaft is lowered by the rear outer shaft and the tip is sucked by the suction nozzle, and after the tip suction, the outer shaft and the inner shaft are moved up by a predetermined stroke by the piston, and the outer arm is raised to close the correction arm. , The tip is aligned with the center of the nozzle, gripped, moved to a predetermined position on the printed board, the outer shaft is lowered again by the piston to expand the correction arm, and after the correction arm is expanded, the outer shaft is expanded. The inner shaft is lowered, the tip sucked by the suction nozzle at the tip thereof is released, and after the tip is released, the outer shaft is raised with the inner shaft for a predetermined stroke by the piston, and then the outer arm is raised to close the correction arm, A suction head for a chip component mounting device.