Parts Mounting Equipment

Abstract

To provide a component mounting device capable of reducing a size of a mounting head.SOLUTION: A mounting head 23 includes: a lifting shaft 32 having a suction nozzle 33 on a bottom end; a rotating mechanism for rotating the lifting shaft 32; and a loading mechanism that applies by air a load for pressing a component onto a substrate via the suction nozzle 33. The rotating mechanism is a hollow motor 31 with a hollow shaft 42 as an axis of rotation. The lifting shaft 32 extends vertically in an internal space 42S of the hollow shaft 42 and is guided to rotate together with the hollow shaft 42 so as to be raised and lowered freely with respect to hollow shaft 42 via a spline guide 42G formed in an internal space 42S. The loading mechanism comprises a pressurized air supply pipe 34 for supplying pressurized air and a diaphragm 81 that is provided in the internal space 42S to press an upper end of the lifting shaft 32 downward receiving pressurized air supplied via the pressurized air supply pipe 34.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a component mounting device that mounts components onto a board using a component holder attached to the lower end of an elevator shaft. [Background technology]

[0002] Conventionally, component mounting devices are known that move a mounting head between a component supply unit and a substrate to mount components on the substrate. The mounting head is equipped with a component holder at the lower end of an elevating shaft that extends vertically, and a rotation mechanism provided on the mounting head allows the nozzle to rotate together with the elevating shaft. Some types of component mounting devices also include a mechanism that uses pressurized air (pneumatic pressure) to press components against the substrate via the component holder when mounting the components on the substrate (for example, see Patent Document 1 listed below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-301677 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a mounting head such as that disclosed in Patent Document 1, which has a mechanism for rotating the lifting shaft and a mechanism for pressing components using pressurized air, these two mechanisms are arranged side by side in the vertical direction of the mounting head, which inevitably increases the vertical dimension of the mounting head, making it difficult to reduce its size.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a component mounting device that can reduce the size of the mounting head. [Means for solving the problem]

[0006] The component mounting device of the present invention is a component mounting device comprising: a mounting head for mounting components onto a substrate, the mounting head comprising a lifting shaft that extends in the vertical direction and has a component holder at its lower end that holds components; a rotation mechanism for rotating the lifting shaft; and a load mechanism that uses pressurized air to apply a load that pressurizes the component against the substrate via the component holder when the component is mounted on the substrate by the component holder. The rotation mechanism is a hollow motor with a hollow shaft as its rotation axis, and the lifting shaft extends in the vertical direction within the internal space of the hollow shaft and is guided by a spline guide provided in the internal space so that it rotates integrally with the hollow shaft and can move up and down relative to the hollow shaft. The load mechanism comprises a pressurized air supply pipe that supplies pressurized air, and a pressure unit provided in the internal space that receives pressurized air supplied through the pressurized air supply pipe and presses the upper end of the lifting shaft downward. [Effects of the Invention]

[0007] According to the present invention, the mounting head can be made smaller. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a plan view of a main part of a component mounting device according to an embodiment of the present invention. [Figure 2] FIG. 1 is a front view of a head unit provided in a component mounting device according to an embodiment of the present invention. [Figure 3] FIG. 1 is a partial cross-sectional side view showing one mounting head constituting a head unit provided in a component mounting device according to an embodiment of the present invention, together with a lifting unit. [Figure 4] FIG. 1 is a partial cross-sectional side view of a mounting head provided in a component mounting device according to an embodiment of the present invention. [Figure 5] 1A and 1B are enlarged side cross-sectional views of a part of a mounting head provided in a component mounting device according to an embodiment of the present invention. [Figure 6] FIG. 1 is a block diagram showing a control system of a component mounting device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows a component mounting device 1 according to one embodiment of the present invention. The component mounting device 1 is a device that mounts components BH on a board KB sent from the upstream side and carries it out downstream. For ease of explanation, the transport direction of the board KB in the component mounting device 1 is defined as the X direction, the horizontal direction perpendicular to the X direction is defined as the Y direction, and the up-down direction is defined as the Z direction.

[0010] 1, component mounting device 1 includes a base 11, a transfer conveyor 12, a tape feeder 13, a head unit 14, and a head unit moving mechanism 15. Transfer conveyor 12 is provided on base 11, and supports both ends of substrate KB from below and transfers it in the X-axis direction.

[0011] The tape feeder 13 is detachably attached to a feeder base 11B installed at the end of the base 11 in the Y direction. A plurality of tape feeders 13 can be attached to the feeder base 11B in an array in the X direction. Each tape feeder 13 pulls out and transports a carrier tape (not shown) from a reel RL, and supplies components BH to a component supply port 13K provided at the end toward the front (the side facing the transport conveyor 12). Note that while the tape feeder 13 is one example of a component supply device, other component supply devices such as a tape feeder that supplies taped radial or axial components, or a tray feeder that supplies components stored in a tray, can also be used.

[0012] 2 and 3, the head unit 14 includes a head base 21 that extends along the XZ plane, and a mounting head 23 that is attached to the head base 21 via an elevating mechanism 22. In this embodiment, three mounting heads 23 are provided side by side in the X direction, and three elevating mechanisms 22 are also provided side by side in the X direction corresponding to the three mounting heads 23.

[0013] 1, head moving mechanism 15 is a mechanism for moving head 14 in a horizontal plane (XY plane), and includes fixed beam 15a that is provided on base 11 and extends in the Y direction, and movable beam 15b that is supported by fixed beam 15a and extends in the X direction. Movable beam 15b is movable in the Y direction along fixed beam 15a, and head base 21 (i.e., head 14) is attached so that it is movable in the X direction along movable beam 15b.

[0014] 3, the lifting mechanism 22 includes a lifting unit 22a provided on the head base 21, a lifting motor 22c provided on the upper part of the lifting unit 22a with a feed screw 22b serving as a drive shaft facing downward, and a head connecting member 22e provided horizontally from the lifting unit 22a and equipped with a nut 22d that screws onto the feed screw 22b. Rotation of the head connecting member 22e around the central axis of the feed screw 22b is restricted by a guide (not shown) provided on the lifting unit 22a. Therefore, when the lifting motor 22c operates and the feed screw 22b rotates, the head connecting member 22e moves up and down relative to the lifting unit 22a via the nut 22d.

[0015] 3, each mounting head 23 includes a hollow motor 31 as a rotation mechanism, an elevating shaft 32, a suction nozzle 33, a pressurized air supply pipe 34 for supplying pressurized air, and a diaphragm unit 35 as a pressurizing unit. The hollow motor 31 includes a housing 41, a hollow shaft 42, a stator 43, and a rotor 44.

[0016] 3, the housing 41 is connected to the head connecting member 22e via an elevating base 41B, which is a member extending in the Z direction, and the hollow shaft 42 extends vertically through the center of the housing 41. The hollow shaft 42 is supported by bearings 45 provided above and below the center of the housing 41 so as to be rotatable around the Z axis (an axis extending in the Z direction).

[0017] 3, the stator 43 is provided in the housing 41, and the rotor 44 is provided on the outer peripheral surface side of the hollow shaft 42. A coil is wound around the stator 43, and the rotor 44 is made of a permanent magnet. When current is applied to the coil of the stator 43, a magnetic field is generated, and the electromagnetic force generated between this magnetic field and the magnetic field generated in the rotor 44 (permanent magnet) causes the rotor 44 to rotate around the Z axis together with the hollow shaft 42. In this way, the hollow shaft 42 serves as the rotating shaft (drive shaft) of the hollow motor 31.

[0018] 3, two slide portions 41S are arranged side by side in the Z direction on the side surface of the lift base 41B. These two slide portions 41S are slidably engaged with mounting head lift guides 22G that are provided on the lift portion 22a and extend in the Z direction. Therefore, when the lift motor 22c is operated to rotate the feed screw 22b around the Z axis, the housing 41 (i.e., the mounting head 23) moves up and down relative to the head base 21. By switching the rotation direction of the feed screw 22b by the lift motor 22c, the head connecting member 22e can be moved upward or downward.

[0019] 3, the lift shaft 32 is provided to extend vertically within the hollow shaft 42. The upper end of the lift shaft 32 is located in the middle of the hollow shaft 42, and the lower end protrudes below the hollow shaft 42. As shown in FIGS. 2 and 3, a nozzle holder 32H is provided at the lower end of the lift shaft 32, and the suction nozzle 33 is detachably attached to the nozzle holder 32H.

[0020] 3 and 4, the lift shaft 32 is guided by a spline guide 42G provided in the lower region of the internal space 42S of the hollow shaft 42. Therefore, the lift shaft 32 can rotate integrally with the hollow shaft 42 and can move up and down relative to the hollow shaft 42.

[0021] That is, in this embodiment, the lifting shaft 32 extends vertically through the internal space 42S of the hollow shaft 42, and is guided by a spline guide 42G provided in the internal space 42S so that it rotates integrally with the hollow shaft 42 and can move up and down freely relative to the hollow shaft 42.

[0022] 3, an air passage 51 inside the lifting shaft is formed near the lower end of the lifting shaft 32. The air passage 51 inside the lifting shaft communicates with an air passage 52 inside the nozzle holder provided in the nozzle holder 32H. An air passage 53 inside the nozzle is provided in the suction nozzle 33, and when the suction nozzle 33 is attached to the nozzle holder 32H, the air passage 53 inside the nozzle communicates with the air passage 51 inside the lifting shaft via the air passage 52 inside the nozzle holder.

[0023] 3, the air passage 51 in the lifting shaft is connected to an external vacuum pressure supply passage 62 that extends from the lower part of the lifting shaft 32 through a rotary joint (lower rotary joint 61) to the outside of the mounting head 23. Rotation of the lower rotary joint 61 around the Z axis is restricted by an anti-rotation guide 41D that extends downward from the lifting base 41B. The lower rotary joint 61 functions to communicate the air passage 51 in the lifting shaft with the external vacuum pressure supply passage 62 regardless of the rotation position of the lifting shaft 32.

[0024] 3, external vacuum pressure supply path 62 is connected to positive pressure source 64 and negative pressure source 65 via valve mechanism 63 provided outside mounting head 23. When positive pressure from positive pressure source 64 or negative pressure from negative pressure source 65 is supplied to air passage 51 inside the lifting shaft through valve mechanism 63, the positive pressure or negative pressure reaches air passage 53 inside the nozzle via air passage 51 inside the lifting shaft and air passage 52 inside the nozzle holder, generating positive pressure (blow pressure) or negative pressure (vacuum suction pressure) at the lower end of suction nozzle 33.

[0025] 3 and 4, the pressurized air supply pipe 34 is provided extending in the vertical direction in an upper region of the internal space 42S of the hollow shaft 42. The pressurized air supply pipe 34 is formed with a pressurized air supply path 34L that supplies pressurized air supplied from the outside (above) of the hollow shaft 42 to the internal space 42S of the hollow shaft 42.

[0026] 3 and 4, the upper end of the hollow shaft 42 is closed by a cap 71. The cap 71 has a through-hole 71H that penetrates in the thickness direction (Z direction). The pressurized air feed path 34L is connected to a joint pipe 72 provided above the cap 71 via the through-hole 71H of the cap 71. The joint pipe 72 is connected to an external air pipe 74 via a rotary joint (upper rotary joint 73), and the external air pipe 74 is connected to a pressurized air supply source 76 via an air supply valve 75. The upper rotary joint 73 functions to connect an air passage 72L (FIG. 4) within the joint pipe 72 to the external air pipe 74, regardless of the rotational position of the joint pipe 72, which rotates around the Z axis integrally with the hollow shaft 42.

[0027] 4 and 5(a) and (b), the diaphragm portion 35 is provided in the middle in the Z direction of the internal space 42S of the hollow shaft 42. The diaphragm portion 35 includes a diaphragm 81 that contacts the upper surface of a flange-shaped protrusion 32T formed at the upper end of the lifting shaft 32, and a cover 82 that holds an outer edge 81E of the diaphragm 81 and covers the diaphragm 81 from above.

[0028] 4 and 5(a) and (b), the cover 82 is provided with a communication hole 82H that communicates with the pressurized air supply path 34L. The lower end of the pressurized air supply pipe 34 is connected to the upper surface of the cover 82 of the diaphragm portion 35, and the pressurized air supply path 34L is connected to the internal space of the diaphragm portion 35 (diaphragm portion internal space 35S) through the communication hole 82H of the cover 82. Therefore, when pressurized air is supplied from the pressurized air supply source 76, the pressurized air is supplied to the diaphragm portion internal space 35S through the air supply valve 75, the external air piping 74, the upper rotary joint 73, the air passage 72L in the joint pipe 72, the pressurized air supply path 34L, and the communication hole 82H of the diaphragm portion 35.

[0029] In each mounting head 23, a spring (not shown) is provided between the lifting shaft 32 and the hollow shaft 42 to urge the lifting shaft 32 upward relative to the hollow shaft 42. When pressurized air is not supplied from the pressurized air supply source 76 and the diaphragm internal space 35S is not pressurized (non-pressurized state), the urging force of the spring causes the lifting shaft 32 to be located at a position (referred to as the "preparation position") where the protrusion 32T at the upper end is located at the middle part of the diaphragm internal space 35S (the middle part in the Z direction) (FIG. 5(a)).

[0030] When pressurized air is supplied to the diaphragm internal space 35S from a state in which the lift shaft 32 is positioned at the standby position, and the diaphragm internal space 35S is pressurized (pressurized state), the diaphragm internal space 35S expands, and the diaphragm 81 pressurizes the upper end of the lift shaft 32 downward against the biasing force of the spring. As a result, the lift shaft 32 is guided by the spline guide 42G and descends into the internal space 42S of the hollow shaft 42 until the protrusion 32T abuts against the upper surface of the spline guide 42G (FIG. 5(a) → FIG. 5(b)). When the protrusion 32T of the lift shaft 32 is thus depressed to a position in which it abuts against the upper surface of the spline guide 42G, the lift shaft 32 is positioned at a position (referred to as the "descended position") that is slightly lower than the standby position by an amount ΔH (FIG. 5(b); the amount of descent of the protrusion 32T) (referred to as the "descended position") (FIG. 4).

[0031] Fig. 6 shows the control system of component mounting device 1. As shown in Fig. 6, control device 90 provided in component mounting device 1 controls the operations of transport conveyor 12, tape feeder 13, head unit 14, and head unit moving mechanism 15. Control device 90 controls transport conveyor 12 to transport board KB and position it at a predetermined work position, and controls tape feeder 13 to supply components BH to component supply port 13K of tape feeder 13.

[0032] The control device 90 also controls the lifting and lowering of the mounting head 23 by each lifting mechanism 22 constituting the head unit 14, and the operation of the hollow motor 31 that rotates the lifting shaft 32 (i.e., the suction nozzle 33) in each mounting head 23. The control device 90 also controls the supply of pressurized air from the pressurized air supply source 76 to the diaphragm unit 35 by operating the air supply valve 75.

[0033] When the component mounting device 1 performs the work of mounting components BH on a board KB (component mounting work), first, the transport conveyor 12 controlled by the control device 90 operates to receive and carry in the board KB sent from the upstream process side. After carrying in the board KB, the transport conveyor 12 positions it at a predetermined work position, and the head unit moving mechanism 15 and the head unit 14 operate in cooperation to cause each of the three mounting heads 23 to repeatedly perform mounting turns.

[0034] The mounting heads 23 repeatedly perform mounting turns to mount components BH on the board KB. In one mounting turn, each mounting head 23 performs the operation of holding (sucking) the component BH supplied by the tape feeder 13 with the suction nozzle 33, and the operation of mounting the component BH held by the suction nozzle 33 at the target mounting position on the board KB.

[0035] When the mounting head 23 mounts the component BH held by the suction nozzle 33 onto the board KB, the control device 90 activates the lifting motor 22c of the lifting mechanism 22 corresponding to that mounting head 23 to lower the entire mounting head 23, but before that, it rotates the suction nozzle 33 around the Z axis together with the hollow shaft 42 of the hollow motor 31 to adjust the posture (angle) of the component BH picked up by the suction nozzle 33 when mounting it onto the board KB.

[0036] Furthermore, before operating the lift motor 22c to lower the entire mounting head 23, the control device 90 supplies pressurized air from the pressurized air supply source 76 to the diaphragm portion 35 via the air supply valve 75, thereby pushing the lift shaft 32 down from the standby position to the lowered position (FIGS. 5(b) and 4). This allows the diaphragm portion 35 to function as an air spring when the lift shaft 32 presses the component BH against the board KB, allowing the component BH to be pressed against the board KB with an appropriate pressing force without placing a large load on the component BH.

[0037] When the head unit 14 (three mounting heads 23) has repeatedly made mounting turns to mount all of the components BH to be mounted on the board KB, the transport conveyor 12 operates to transport the board KB to the downstream process side of the component mounting device 1. This completes the component mounting work for one board KB.

[0038] As described above, in component mounting device 1 of this embodiment, in mounting head 23, the rotation mechanism that rotates lift shaft 32, to the lower end of which suction nozzle 33 is attached, is hollow motor 31 with hollow shaft 42 as its rotation axis, and lift shaft 32 extends vertically through internal space 42S of hollow shaft 42 and is guided by spline guides 42G provided in internal space 42S so that it rotates integrally with hollow shaft 42 and can move up and down relative to hollow shaft 42. The load mechanism that applies a load by air to press component BH against board KB via suction nozzle 33 is made up of pressurized air feed pipe 34 that feeds pressurized air into internal space 42S of hollow shaft 42, and a pressure unit (diaphragm unit 35) that is provided in internal space 42S of hollow shaft 42 and receives pressurized air supplied through pressurized air feed pipe 34 and presses the upper end (protrusion 32T) of lift shaft 32 downward.

[0039] That is, in the component mounting device 1 of this embodiment, the loading mechanism of the mounting head 23 is provided inside the rotation mechanism, which allows the vertical dimension to be smaller than in the conventional case where the rotation mechanism and the loading mechanism are arranged vertically. Therefore, according to this embodiment, the mounting head 23 equipped with both the rotation mechanism and the loading mechanism can be made smaller.

[0040] As described above, in the component mounting device 1 of this embodiment, the rotation mechanism (hollow motor 31) and the load mechanism (diaphragm portion 35) of the mounting head 23 are not arranged one above the other, but the load mechanism is arranged inside the rotation mechanism, thereby reducing the vertical dimension and enabling the miniaturization of the mounting head 23. Furthermore, by miniaturizing the mounting head 23, the mounting head 23 can be moved stably at high speed, thereby enabling the takt time of the component mounting operation performed by the component mounting device 1 to be improved.

[0041] Although the present invention has been described above in terms of the preferred embodiment, the present invention is not limited to the above and various modifications are possible. For example, in the above-described preferred embodiment, the head unit 14 is provided with three mounting heads 23, but this is merely an example and the number is not critical. Furthermore, the configuration of the hollow motor 31 in the above-described preferred embodiment for rotating the hollow shaft 42 (e.g., a combination of a stator 43 made of a coil and a rotor 44 made of a permanent magnet) may be different from that of the preferred embodiment. [Industrial Applicability]

[0042] The present invention can be applied to a component mounting device that mounts components onto a board using a component holder attached to the lower end of a lift shaft. [Explanation of symbols]

[0043] 1. Parts mounting device 23 Mounting head 31 Hollow motor (rotating mechanism) 32 Elevating shaft 33 Suction nozzle (component holder) 34 Pressurized air supply pipe (load mechanism) 34L Pressurized air supply line 35 Diaphragm section (pressure section) (load mechanism) 41 Housing 42 Hollow shaft 42G spline guide 42S interior space 43 Stator 44 rotor 76 Pressurized air supply source 81 Diaphragm 82 Covering Body 90 Control device BH parts KB board

Claims

1. A component mounting device comprising: a mounting head for mounting components onto a substrate, the mounting head comprising: an elevating shaft extending in the vertical direction and having a component holder at its lower end for holding components; a rotation mechanism for rotating the elevating shaft; and a load mechanism for applying a load by pressurized air to pressurize the components against the substrate via the component holder when the components are mounted onto the substrate by the component holder; the rotation mechanism is a hollow motor with a hollow shaft as a rotation axis, the lifting shaft extends vertically through the internal space of the hollow shaft, and is guided by a spline guide provided in the internal space so as to rotate integrally with the hollow shaft and to be able to move up and down relative to the hollow shaft; The loading mechanism of the component mounting device comprises a pressurized air supply pipe that supplies pressurized air, and a pressure unit that is provided in the internal space and receives the pressurized air supplied through the pressurized air supply pipe and presses the upper end of the lifting shaft downward.

2. 2. The component mounting device according to claim 1, wherein the pressurized air supply pipe is provided in an area above the pressurizing unit in the internal space.

3. The component mounting device according to claim 1 , wherein the pressure applying portion includes a diaphragm.

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