KR20000009371A - Chip mounter head - Google Patents

Abstract

PURPOSE: A chip mounter head is provided to accurately populate the electronic components on a substrate. CONSTITUTION: A chip mounter includes a component position regulator(82), a component arrangement sensor(6), and a main frame(10) positioned on the component arrangement sensor(6). A hollow shaft motor(14) supported by the main frame(10), and its center line penetrates a penetration hole. A ball spline(26) is fixedly mounted to the hollow shaft(16) of the hollow shaft motor(14). A spindle(24) penetrates the ball spline(26) and the penetration hole(12), includes at least one spindle groove(72) in a direction of a length, so that the spindle(24) receives a rotation power from the motor(14) through the ball spline(26), and performs a shaft rotation and an elevation movement. A bearing(86) is mounted to a part(84) formed along a circumference. Absorption part(18) is mounted to a lower part of the spindle(24). Air flow path(20) is formed to a center shaft part in a length direction. A spindle frame(30) includes the bearing(86), supports the spindle(24) for a rotation, and mounts a rack equipment at its one side so that at least two racks in parallel connected to each other make one pair. A motor(34) drives a pinion(32) meshed with the racks(42,44) of the rack equipment(28), elevates the rack equipment(28), and is mounted to a main frame(10).

Description

Chip mounter head

The present invention relates to a component mounting apparatus, and more particularly, to a chip mounter head configured to accurately mount a component on a substrate.

Due to the remarkable development of science and technology, component mounting devices with faster and more accurate mounting performance are being developed in response to the demand for high integration, high functionalization and small size of various electronic devices. As is known, the performance of the component mounting apparatus is closely related to how quickly and accurately the head is positioned in the required position. There is a trend to reduce the size and weight of the head in order to quickly and accurately position the head in the required position, and many methods and apparatus have been developed to precisely lift the suction means.

Conventionally, a timing belt or a gear has been used as the power transmission medium for operating the head of the mounting apparatus. That is, in the conventional component mounting apparatus, in raising and lowering the spindle in the head in order to mount the component on the board, the component is mounted by applying power generated from the motor to the spindle through an intermediate power transmission medium such as a belt or a gear. It is configured to.

However, in the conventional component mounting apparatus configured as described above, the power generated in the drive shaft of the motor is not accurately transmitted to the spindle due to the sagging of the timing belt or the backlash generated in the gears. I couldn't expect it. In particular, the timing belt has a change in tension with temperature, so that the rotational force of the motor cannot be accurately applied to the lifting motion of the spindle, and the thermal and mechanical durability of the belt itself cannot be guaranteed. In addition, the structure of the head portion is complicated, the weight is increased, it is difficult to quickly and accurately position the head, and also hassle that the maintenance of the equipment is required in relation to the life of the timing belt.

The present invention has been made to solve the above problems, by applying a rack mechanism configured to prevent backlash for the accurate lifting movement of the spindle, to enable the spindle to make a constant high efficiency lifting movement, furthermore the structure of the head The purpose of the present invention is to provide a chip mounter head capable of improving the overall performance of the mounting apparatus by simplifying and miniaturizing the weight.

1 is an exploded perspective view schematically showing the configuration of a chip mounter head according to an embodiment of the present invention.

Figure 2 is an exploded perspective view showing the rack mechanism of the chip mounter head according to an embodiment of the present invention.

3 is a view for explaining the configuration of the rack mechanism according to an embodiment of the present invention.

4 is a cross-sectional view taken along line IV-IV of FIG. 3.

5 shows a relative position of teeth of a first rack and a second rack in a rack mechanism according to an embodiment of the present invention.

6 is a view for explaining the principle that the backlash is prevented when the pinion is engaged with the rack mechanism according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

6: Component alignment detection mechanism 8: support

10: main frame 12: through hole

14: Hollow shaft motor 16: Hollow shaft

18: adsorption means 20: air movement passage

24: Spindle 26: Ball Spline

28: rack mechanism 30: spindle frame

32: Pinion 34: Motor

36: projection jaw 38: support jaw

40: Tensile spring 42: The first rack

44: Second rack 46, 47: This

48: Bolt 50: Dove pin

52: long 54: hook

56: spring 57: support jaw

58: Guide hole 59: Pinhole

60: guide pin 62: head

66: guide groove 68: guide member

70: spindle support groove 72: spindle groove

74, 76: projection 78, 80: bolt hole

82: parts position adjusting means 84: main part

86: Bearing 88: Hole

90: sensor dock 92: sensor

94: through mail

In order to achieve the above object, the present invention includes a component alignment sensing mechanism including a component position adjusting means, the through-hole is provided on the support surface; A main frame positioned above the component alignment detection mechanism; A hollow shaft motor supported by the main frame and installed such that a center line of the driving shaft passes through the through hole; A ball spline fixedly installed in the hollow shaft of the hollow shaft motor; At least one spindle groove is formed on the outer circumferential surface in the longitudinal direction so as to penetrate the ball spline and the through hole and receive rotational force from the hollow shaft motor through the ball spline so as to rotate and lift. A spindle provided with a bearing at a recess, a suction unit at a lower end thereof, and a spindle having an air movement path formed in a longitudinal direction at a central shaft thereof; A spindle frame including the bearing and rotatably supporting the spindle, and having a rack mechanism disposed at one side thereof so that at least two or more racks are arranged in parallel in a pair and parallel to each other; It characterized in that it comprises a motor installed on the main frame to drive the pinion to be engaged with the rack of the rack mechanism at the same time to raise and lower the rack mechanism.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a view schematically illustrating a configuration of a chip mounter head according to an embodiment of the present invention.

As shown, the chip mounter head according to the present embodiment, the component alignment detection mechanism 6, the main frame 10, the hollow shaft motor 14 and the hollow shaft motor (mounted to the main frame 10) ( And a spindle 24 installed to penetrate through the drive shaft of 14, and a spindle frame 30 and a motor 34 for lifting and lowering the spindle 24.

The through hole 12 is formed in the substantially middle portion of the support surface 8 of the component alignment detection mechanism 6. The through hole 12 is formed by allowing the spindle 24 to move up and down, so that the adsorption means 18 can adsorb and detach the part. In addition, the component position adjusting means 82 is for controlling the mounting angle of the components adsorbed by the adsorption means 18, and comprises a light emitting portion and a light receiving portion, by irradiating light to the components adsorbed from the light emitting portion, It is a device that controls the mounting angle of a component as the size of the shadow of the component projected on the light receiving portion side.

The hollow shaft motor 14 is installed at a predetermined height by the main frame 10 at the upper portion of the through hole 12. The hollow shaft motor 14 is configured such that the driving shaft vertically penetrates the body of the hollow shaft motor 14, and the driving shaft is hollow like a pipe. In addition, the hollow shaft motor 14 may be installed directly by contacting the upper surface of the support surface (8). The ball spline 26 is fixed to the inside of the hollow shaft 16. The ball spline 26 is a known element, the outer peripheral surface of which is fixed in close contact with the inner peripheral surface of the hollow shaft (16). A sensor dog 90 of a disc shape is provided at the upper end of the ball spline 26. The sensor dock 90 is for measuring the axial rotation angle of the ball spline 26, and consists of one set with the sensor 92 fixed to the main frame 10.

The spindle 24 is a hollow shaft having a circular cross section. The spindle 24 is installed through the inside of the ball spline 26, and a suction unit 18 is provided at a lower end thereof. In addition, an air movement passage 20 communicating with the suction means 18 is formed in the central shaft portion of the spindle 24. The air movement passage 20 draws air upwards in a state where the adsorption means 18 is in contact with the parts so that the adsorption means 18 can adsorb the parts by vacuum pressure, and thus the vacuum pressure between the adsorption means and the parts. It is formed to provide. In addition, the outer peripheral surface of the spindle 24 is formed with a spindle groove 72 in the longitudinal direction. The spindle groove 72 includes a ball between the spindle groove 72 and the inner circumferential surface of the ball spline 26, thereby allowing the lifting motion of the spindle 24 relative to the ball spline 26, and The rotational force of the ball spline 26 is provided to be transmitted to the spindle 24. A recess 84 is formed at an upper portion of the spindle 24, and a bearing 86 is installed at the recess 84. The outer circumferential surface of the bearing 86 protrudes with respect to the outer circumferential surface of the spindle 24. The protruding bearing 86 is installed in the spindle support groove 70 of the spindle frame 30 to be described later.

The spindle frame 30 is installed on the upper side of the spindle 24. The spindle frame 30 is moved up and down by the motor 34 installed in the main frame 10, the spindle support groove 70 and the support jaw 38 for supporting the bearing 86 of the spindle 24 is The through plate 94 is fixed to the upper surface so that the spindle 24 does not protrude to the upper portion of the spindle frame 30. A hole 88 is provided in the center portion of the through plate 94, and an upper end portion of the spindle 24 passes through the hole to be connected to a vacuum pump (not shown), but is fixed to the recess portion 84. Does not pass. Therefore, the bearing 86 does not move to the upper or lower portion of the spindle frame 30 so that the spindle 24 does not move up and down relative to the spindle frame 30. Spindle frame 30 is for transmitting the lifting force to the spindle 24, the spindle support groove 70 including the spindle 24 is formed in the center. On the inner circumferential surface of the spindle support groove 70 is formed a support jaw 38 for supporting the bearing 86 installed on the recessed portion 84 of the spindle 24 from the bottom. Therefore, the bearing 86 provided in the recessed portion 84 of the spindle 24 is supported by the support jaw 38 in a state of being in close contact with the inner circumferential surface of the spindle support groove 70, so that the spindle 24 is the spindle frame 30. It can be rotated at that height without escaping downward. In addition, the through plate 94 is provided on the upper surface of the spindle frame 30, the inner peripheral surface of the hole 88 formed in the center portion of the through plate 94 to support the bearing 86 downward to the spindle 24 Do not escape upward from the spindle frame (30).

Guide grooves 66 are formed on the side surfaces of the spindle frame 30. The guide groove 66 is provided to allow the spindle frame 30 to smoothly move up and down when the spindle frame 30 moves up and down by the motor 34, and is formed on one inner wall of the main frame 10. It is guided by the guide member 68. Of course, the guide groove 66 and the guide member 68 may be installed in plural numbers.

On the other hand, the tension spring 40 is provided so as to always support the spindle frame 30 in the upward direction with respect to the main frame 10. To this end, a protrusion 74 is provided on one side of the spindle frame 30, and a protrusion 76 is formed on the main frame 10 so as to be spaced a predetermined height corresponding to the protrusion 74, and both sides of the tension spring 40 are formed. By connecting with), the spindle frame 30 with respect to the main frame 10 is configured to be elastically supported in the upward direction.

Two racks 42 and 44 are installed on one side wall of the spindle frame 30. The racks 42 and 44 are provided for lifting and lowering the spindle frame 30, and the two racks 42 and 44 are arranged in parallel to form a pair and parallel to each other. Each rack 42, 44 is installed vertically in the same direction as the lifting direction of the spindle 24, the teeth (46) of the rack (42, 44) to be smoothly engaged with the pinion (32) of the motor (34). 47 teeth) is preferably configured to protrude from one side wall of the spindle frame (30). The racks 42 and 44 are paired with the first rack 42 and the second rack 44.

2, 3 and 4 are diagrams for explaining the rack mechanism of the chip mounter head according to an embodiment of the present invention.

As shown, the rack mechanism according to the present embodiment is composed of a first rack 42 and a second rack 44. The first rack 42 and the second rack 44 are spur gears having teeth of the same shape. The first rack 42 and the second rack 44 are configured in parallel to face the same direction, and the second rack 44 is connected to the first rack 42. It is installed to be slidable with respect to.

First, the first rack 42 is bolted to one side wall of the spindle frame 30. At this time, the first rack 42 is installed so that teeth 46 of the first rack 42 protrude outward with respect to the A plane formed by one side wall of the spindle frame 30. In order to install the first rack 42, a bolt hole 78 is formed laterally in the first rack 42, and the first rack 42 as the bolt 48 is positioned at an appropriate position of the spindle frame 30. Coupled to the formed bolt hole 80, the first rack 42 is fixed to the side of the spindle frame (30). Therefore, one side of the first rack 42 is in contact with the side of the spindle frame (30).

Protrusion pin 50 is formed on the outer surface of the first rack 42 fixed to the spindle frame (30). The protrusion pin 50 is for supporting one end of the spring 56, which will be described later, and is positioned at an upper side of the outer surface of the first rack 42.

The second rack 44 is provided on the side of the first rack 42. The second rack 44 is installed in contact with the first rack 42 by the guide pin 60. The second rack 44 is formed with a long hole 52 including the protrusion pin 50 therein in the assembled state with the first rack 42. The lower part of the inner circumferential surface of the long hole 52 is provided with a hook 54 so as to be spaced apart from the protrusion pin 50 by a predetermined distance, and the long hole 52 in which the first rack 42 and the second rack 44 are assembled. The inside of the protrusion pin 50 and the hook 54 is located at a predetermined distance apart. A spring 56 is installed between the protrusion pin 50 and the hook 54. The spring 56 is a tension spring, the upper end is coupled to the protrusion pin 50, the lower end is coupled to the hook 54, the second rack 54 to the first rack 42, the arrow of FIG. Elastic support in the direction of a. Of course, a compression spring may be used without using the tension spring between the protrusion pin 50 and the hook 54. When using a compression spring, the second rack 44 is elastically supported in the opposite direction to the arrow a with respect to the first rack 42.

On the other hand, in order to slidably couple the second rack 44 to the first rack 42, guide holes 58 are formed on the upper and lower portions of the long hole 52 of the second rack 44, respectively, The guide pin 60 is fixed to the outer surface of the first rack 42 through the guide slot 58. As will be described later, the guide pin 60 is slidable to the second rack 44 relative to the first rack 42, and at the same time the head 62 is formed so as not to be separated from the first rack 42 have.

Referring to Figures 3 and 4, the principle of the sliding motion of the second rack 44 relative to the first rack 42 is as follows.

First, the guide hole 58 is located in the upper and lower portions of the long hole 52 is formed in an elliptical elongated up and down, the cross-sectional shape is stepped to form a support jaw 57. Therefore, the outer surface of the second rack 44 is formed with an elongated elliptical guide slot 58 vertically, and a circular pin hole 59 penetrates the second rack 44 at the center of the guide slot 58. In the formed state, the guide pin 60 passes through the guide slot 58 and the pin hole 59 to penetrate laterally of the second rack 44. The guide pin 60 is a member supporting the second rack 44 toward the first rack 42 by penetrating the guide hole 58 and the pin hole 59, and a head 62 is formed at an end thereof. The diameter of the head 62 is formed to be larger than the diameter of the pin hole 59 so that the head 62 does not fall into the pin hole 59 and supports the internal support jaw 57 of the guide slot 58. It is. The minimum diameter of the elliptical guide slot 58 is larger than the diameter of the head 62, and in particular, since the elliptical shape is elongated up and down, the head 62 can move up and down within the guide slot 58. That is, the second rack 44 may move up and down in the direction of the arrow b with respect to the guide pin 60 fixed to the first rack 42. In addition, the lifting distance to the first rack 42 of the second rack 44 is the difference value z between the distance between the upper and lower portions of the inner circumferential surface of the guide slot 58 and the diameter of the head 62. As described above, since the spring 56 provided inside the long hole 52 elastically supports the second rack 44 in the direction of the arrow a with respect to the first rack 42, in the state where no external force is applied. As shown in Fig. 5, the teeth 46 of the first rack and the teeth 47 of the second rack 44 do not form a straight line.

FIG. 5 is a diagram showing the mutual positions of teeth of the first and second racks, which are preferably set in the rack mechanism according to the embodiment of the present invention.

As described above, when no external force other than the force by the spring 56 is applied, the second rack 44 is elastically supported in one direction by the spring 56 with respect to the first rack 42, so that the spring The second rack 44 is configured to be moved by the interval y with respect to the first rack 42 fixedly coupled to the spindle frame 30 based on the elastic force of 56. In the first rack 42 and the second rack 44 configured as described above, the second rack is adapted to match the teeth 47 of the second rack 44 with the teeth 46 of the first rack 42. In order to move the 44 by the distance y in the direction of the arrow b, the second rack 44 must be moved with a force stronger than the elastic bearing force of the spring 56. That is, by using the external force to overcome the elastic force of the spring 56 to align the teeth 46 of the first rack 42 and the teeth 47 of the second rack 44, the fixed first rack 42 The second rack 44 has a potential energy corresponding to the restoring force of the spring 56 to move in the opposite direction of the arrow b.

Subsequently, the operation of the rack mechanism will be described with reference to FIG. 6.

6 is a view for explaining the operation of the rack mechanism according to an embodiment of the present invention.

The drawing pulls the second rack 44 against the first rack 42 fixed to the spindle frame 30 in the opposite direction of the elastic force direction of the spring 56 so that the teeth 46 of the first rack It is a figure which matched the pinion 32, after matching the teeth 47 of two racks 44. As shown in FIG.

As described above, the second rack 44 is elastically supported by the spring 56 in the direction of the arrow c with respect to the first rack 42, so that the pinion 32 rotates in the direction of the arrow d, and thus the first rack. Even if the teeth 46 of the 42 are in contact with each other, the teeth 47 of the second rack 44 are not in contact with the teeth of the pinion 32 as the teeth 46 of the first rack 42 are. This p1 of 32) is spaced apart by a distance g to abut this p2 of the pinion 32. As described above, since the second rack 44 is elastically supported by the restoring force of the spring 56, a force f corresponding to the restoring force of the spring 56 acts on this p2 of the pinion 32. Thus, even if the rotation direction of the pinion 32 suddenly changes and the pinion 32 rotates in the direction of the arrow e, the teeth 47 of the second rack 44 press this tooth p2 of the pinion 32 with the force f. Therefore, the impact due to backlash does not occur. That is, even if the rotation direction of the pinion 32 changes from arrow d to e, since this p2 of the pinion 32 continuously receives the pressing force f of the tooth 47 of the second rack 44, the pinion f There is no collision with the teeth of the teeth (32) and the teeth of the racks, and this p2 overcomes the pressing force f and pushes the second rack 44 in the opposite direction of the pressing force f, resulting in the first rack 42 In contact with the teeth 46 of), the pinion p2 presses the first rack 42. Since the pressing force f is a force provided from the spring 56, even if the direction of the pinion 32 is changed by the elastic force of the spring 56, the collision of the pinion teeth and the rack teeth does not occur. Recombination of p2 and teeth 46 of first rack 42 is buffered.

In this figure, the rotation direction of the arrow e of the pinion 32 is a direction for lowering the spindle frame 30, and the direction of the arrow d is a direction for raising the spindle frame 30.

Operation of the chip mounter head according to the embodiment of the present invention made as described above is as follows.

In order to suck the parts, the spindle 24 rotates and descends through the hollow shaft motor 14 to suck the parts. At this time, the rotation of the spindle 24 is performed by the hollow shaft motor 14, the lowering movement is performed by the motor 34. As described above, the pinion 32 provided on the drive shaft of the motor 34 rotates in engagement with the rack mechanism 28, thereby raising and lowering the spindle frame 30. When the suction means 18 installed at the lower end of the spindle 24 comes down to the target point and comes into contact with the parts, the suction pump 18 operates when the vacuum pump (not shown) is discharged to discharge the air through the air moving passage 20. A vacuum is formed in the internal space between the component and the component to allow adsorption of the component. The chip mounter head is moved to a predetermined position on the substrate in a state in which the component is lifted by the suction force, and then, by using the component position adjusting means 82, the proper mounting angle is lowered to adjust the pressure inside the suction means 18. Place the part on the board. When the mounting of the parts is completed, the rotation direction of the motor 34 is changed and the spindle frame 30 is raised, so that the spindle 24 is spaced apart from the substrate and moves to a position for sucking the next part. The tension spring 40 operates to more effectively lift the spindle frame 30.

The present invention has been described in detail through specific embodiments, but the present invention is not limited to the above-described embodiments, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. Of course it is possible.

The chip mounter head of the present invention made as described above uses a rack and pinion having a structure in which no backlash occurs as a mechanism for lifting and lowering the spindle, and thus the precision of the lifting and lowering motion of the spindle can be realized. In addition, since the size and weight of the chip mounter head can be reduced, the chip mounter head can be moved more quickly and accurately, and the speed of mounting the chip on the substrate and the precision of the mounting can be improved.

Claims (5)

A component alignment detecting mechanism (6) including a component position adjusting means (82) and provided with a through hole (12) in the support surface (8); A main frame 10 positioned above the component alignment detection mechanism 6; A hollow shaft motor 14 supported by the main frame 10 and installed so that the center line of the driving shaft penetrates the through hole 12; A ball spline 26 fixedly installed in the hollow shaft 16 of the hollow shaft motor 14; At least one spindle groove penetrating through the ball spline 26 and the through hole 12 and being provided with a rotational force from the hollow shaft motor 14 through the ball spline 26 to allow axial rotation and lifting. 72 is formed in the longitudinal direction, the bearing 86 is provided on the recessed portion 84 formed along the outer circumferential surface at the upper end, the adsorption means 18 is installed at the lower end, and the air movement passage 20 in the longitudinal direction at the central shaft portion. And a spindle 24 formed with; A spindle frame including the bearing 86 to rotatably support the spindle 24 and having a rack mechanism 28 disposed on one side thereof in parallel so that at least two or more racks form a pair and are parallel to each other. 30) and; It includes a motor (34) installed in the main frame 10 to drive the pinion (32) engaged with the racks (42, 44) of the rack mechanism 28 at the same time to raise and lower the rack mechanism (28) Chip mounter head, characterized in that. 2. The rack mechanism (28) according to claim 1, wherein the rack mechanism (28) has a pair of first racks (42) and a second rack (44), parallel to each other, and have the same shape of the gear parts (46, 47). , The first rack 42 is bolted to the spindle frame 30 in the lateral direction (48) so that one side is facing the spindle frame 30, the other side is formed with a projection pin 50, the second rack is The long hole 52 is provided on the side of the first rack to include the protrusion pin 50 therein, the hook 54 is provided on the lower inner circumferential surface of the long hole 52, the inside of the long hole 52 Chip mounter head, characterized in that the elastic means coupled to both ends of the protrusion pin 50 and the hook 54 is installed. The method of claim 2, wherein the guide hole (58) penetrating through the second rack 44, respectively formed in the upper and lower portion of the long hole 52, the guide pin 60 is inserted through the guide long hole (58) The second rack (44) is constrained by the guide pin (60), the chip mounter head, characterized in that configured to be linear movement with respect to the first rack (42). The end of the guide pin 60 is formed with a head 62 serving as a stopper, and the second rack 44 is supported by the head 62 toward the first rack 42. Chip mounter head, characterized in that the support jaw 57 is formed on the inner peripheral surface of the guide slot (58). 3. The chip mounter head of claim 2, wherein the elastic means is a tension spring.