JP2008108951A - Linear motion device, and electronic component mounting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear motion device in which the weight acting on a beam is balanced. <P>SOLUTION: The linear motion device 6 comprises a beam 10 extended in one direction parallel with the work plane, a guide 11 provided on the beam 10 to extend in one direction, a slider 12 provided in the guide 11 movably in one direction, a linear motor having a moving member 13 provided in the slider 12 and a fixed member 14 provided on the beam 10, a control board 20 provided on the slider 12 and performing operation control of a mounting head 7, and a wiring box 22 for leading a connection cable connected with the control board 20 to one end side of the beam 10 wherein the control board 20 is arranged above the beam 10 and the mounting head 7 and the wiring box 22 are arranged on the opposite sides of the beam 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a linear motion device in which a slider can be moved in a beam extending direction and an electronic component mounting apparatus including the linear motion device.

  In the mounting field, a mounting apparatus having a mechanism for horizontally moving a mounting head with respect to a fixed main body is widely used. The horizontal movement mechanism includes a first beam that moves the mounting head in the first direction, and a second beam that moves the first beam in a second direction orthogonal to the first direction. The orthogonal movement mechanism is widely used, and the mounting head is movable within a rectangular area in which the movement lengths of the first beam and the second beam are two orthogonal sides.

In recent years, for the purpose of further improving the area productivity, an orthogonal movement mechanism that has been a dual-support type in which both ends of the first beam are conventionally supported by two second beams arranged in parallel, The one in which only one end of the first beam is supported by a single second beam is used. In the cantilever support type, the positioning accuracy of the mounting head deteriorates especially on the free end side due to the downward deflection due to its own weight and the horizontal deflection due to acceleration / deceleration during movement. For example, a beam made of CFRP (carbon fiber reinforced plastic) having a small specific gravity is used to minimize deformation (see Patent Document 1).
JP-T-2006-514437

  In order to prevent the head positioning accuracy from deteriorating, to improve the durability of the guide, and to prevent the positioning accuracy from decreasing, the first beam itself is twisted by adjusting the weight balance acting on the first beam. It is desirable to make the load as uniform as possible at the place where the first beam is supported by the second beam.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a linear motion device having a balanced weight acting on a beam and an electronic component mounting apparatus including the linear motion device.

  The linear motion device according to claim 1, a beam extending in one direction parallel to a work surface, a guide provided to the beam extending in the one direction, and the guide being movable in the one direction. A slider, a linear motion mechanism for moving the slider in the one direction, a control board for controlling the operation of the head provided on the slider, and a wiring connected to the control board. A wiring path for leading to one end of the beam, the control board is disposed either above or below the beam, and the head and the wiring path are disposed on both sides of the beam.

  The electronic component mounting apparatus according to claim 2, wherein the electronic component mounting apparatus includes the work surface and the linear motion device, and an electronic component mounting head is provided on the slider, and an electronic component is mounted on the substrate on the work surface. Mount the parts.

According to the present invention, the control board is arranged either above or below the beam, the head and the wiring path are arranged on both sides of the beam, the weight balance acting on the beam is adjusted, and the center of gravity is set to the center of the cross section of the beam. Therefore, deformation such as twisting of the beam can be prevented.

  Embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view of an electronic component mounting apparatus according to the present embodiment, FIG. 2 is a perspective view of a linear motion apparatus according to the present embodiment, FIG. 3 is a sectional view taken along line AA in FIG. 2, and FIG. It is a side view of a moving device.

  First, the configuration and operation of the electronic component mounting apparatus will be described. In FIG. 1, an electronic component mounting apparatus 1 includes a substrate transfer device 3, an electronic component supply device 4, a first linear motion device 5, a second linear motion device 6, and a mounting head 7 provided on a base 2. Has been. The upper surface of the base 2 is a work surface 2a that forms a horizontal plane, and a mounting operation is performed on the work surface 2a. The substrate transport device 3 has a function of transporting the substrate 8 in the X direction and a function of holding the substrate 8 at a predetermined position on the work surface 2a. The substrate 8 before mounting is loaded into the electronic component mounting apparatus 1 and mounted. The inside is maintained in a predetermined position, and after mounting, the substrate 8 is released from the electronic component mounting apparatus 1 after being mounted. In the following description, the transport direction of the substrate 8 is the X direction, and the direction orthogonal to this in the horizontal plane is the Y direction. The electronic component supply device 4 has a function of supplying a predetermined number of electronic components accommodated therein to the outside in a predetermined posture, and a plurality of electronic component supply devices 4 are arranged on both sides of the substrate transfer device 3.

  The first linear motion device 5 and the second linear motion device 6 have a function of linearly moving the object in the Y direction and the X direction above the base 2. One end of the second linear motion device 6 is supported by the first linear motion device 5, and can move in the Y direction by driving the first linear motion device 5. A mounting head 7 is supported on the second linear motion device 6, and can be moved in the X direction by driving the second linear motion device 6. Accordingly, the mounting head 7 can be moved horizontally above the base 2 and positioned at an arbitrary position by a combination of driving of the first linear motion device 5 and the second linear motion device 6. The mounting head 7 is provided with a nozzle 9 that sucks an electronic component. The nozzle 9 sucks the electronic component supplied from the electronic component supply device 4 and mounts it on the substrate 4.

  Next, the configuration and operation of the second linear motion device will be described. 2 and 3, the second linear motion device 6 includes a beam 10 stretched in the X direction parallel to the work surface 2a (see FIG. 1), and a side portion in the Y direction of the beam 10 stretched in the X direction. A pair of guides 11, a slider 12 provided on the pair of guides 11 so as to be movable in the X direction, a mover 13 provided on the slider 12, and a stator 14 provided on the beam 10. It consists of a linear motor.

  The beam 10 is formed by stacking cylindrical bodies 10a, 10b, and 10c made of carbon fiber reinforced plastic (CFRP = Carbon Fiber Reinforced Plastics) in the Z direction, and second cylindrical bodies 10b on both sides of the first cylindrical body 10a. 10c is arranged. CFRP is a composite material in which carbon fiber is impregnated with a polymer material such as an epoxy resin and then cured and molded. It has excellent strength and has the same strength and rigidity as compared to metals such as iron and aluminum. However, although it has the feature that it can be made lighter, it is difficult to process the carbon fiber and it is difficult to form it into a complicated shape, which causes an increase in cost. The beam 10 is formed of three cylindrical bodies 10a, 10b, and 10c each having a relatively simple rectangular shape in the Z direction and integrally formed in the Z direction. Therefore, there is no particular difficulty in the manufacturing process. .

A pair of guides 11 extends in the X direction on the surface of the second cylindrical body 10b, 10c facing the slider 12, and the stator is disposed on the surface of the first cylindrical body 10a facing the slider 12. 14
Are extended in the X direction. Note that a step corresponding to the dimensional difference in the Y direction between the pair of guides 11 and the linear motor is required on the surfaces of the first cylindrical body 10a and the second cylindrical bodies 10b and 10c facing the slider 12. The first cylindrical body 10a has a shorter extension in the Y direction than the second cylindrical bodies 10b and 10c.

  A guide block 15 is provided at a position of the slider 12 opposite to the second cylindrical bodies 10b and 10c, and engages with the pair of guides 11 so as to be slidable in the X direction. A movable element 13 is provided through a spacer 16 at a location facing the first cylindrical body 10a of the slider 12 and faces the stator 14 with a predetermined distance (gap). On the side of the movable element 13 facing the slider 12, a heat radiating fin 17 is provided along the X direction that protrudes into a gap a formed between the movable element 13 and the slider 12. A fan 18 is provided at the tip of the beam 10 to form an airflow in the X direction in a gap a formed between the mover 13 and the slider 12.

  When a magnetic flux is generated by applying electricity to a coil built in the mover 13 side of the linear motor constituting the linear motion mechanism, the mover 13 is attracted by a pulling force acting between the permanent magnets arranged on the stator 14. Propulsive force is generated, and the slider 12 moves in the X direction. The mover 13 generates heat due to an electric current, but the slider has a heat insulating effect due to an air layer existing in the gap portion a and a heat insulating effect due to a spacer 16 formed of a heat insulating material having a low thermal conductivity such as ceramic or phenol resin. It is difficult to transmit to the 12 side. Further, when the slider 12 moves, since the gap portion a serves as a vent hole, the heat generated in the movable element 13 by the current is dissipated from the radiation fins 17. While the slider 12 is stopped, the heat generated by the mover 13 stays around the heat dissipating fins 17, so that the air flow in the X direction is forcibly formed in the gap portion a by the driving of the fan 18. Prompt.

  Thereby, obstruction of the smooth movement of the slider 12 due to the thermal deformation of the slider 12 and the guide 11 can be prevented, and the positioning accuracy and the durability of the guide 11 can be improved. Further, a strong attractive force due to the magnetic force acts between the mover 13 and the stator 14, but two joints formed by opposing side surfaces of the three cylindrical bodies 10 a, 10 b, and 10 c constituting the beam 10. The portion 19 plays the role of a rib, minimizing the displacement of the gap between the mover 13 and the stator 14 and the deformation of the pair of guides 11, resulting from the suction force acting between the mover 13 and the stator 14. The smooth movement of the slider 12 is prevented and the positioning accuracy is prevented from deteriorating. Note that the fan 18 that is an air flow forming means can form a stronger air flow as it is closer to the heat radiating fins 17, and therefore is provided integrally with the slider 12 and is always provided regardless of the position of the slider 12. A high heat dissipation effect can be expected by maintaining the state close to the heat dissipation fins 17.

  The first linear motion device 5 has the same configuration as that of the second linear motion device 6 described above, and the beam 25 extended in the Y direction and the side of the beam 25 in the X direction on the Y direction. A pair of guides 26 that are extended to each other, and a slider 27 that is provided on the pair of guides 26 so as to be movable in the Y direction, and a linear motor as a linear motion mechanism. A guide block 28 that engages with the pair of guides 11 is provided on the side of the slider 27 facing the guide 26, and the slider 27 is slidable in the Y direction by driving a linear motor. The second linear motion device 6 is mounted with one end thereof being cantilevered by the slider 27.

In FIG. 3, the upper portion of the slider 12 is an upper arm 12 a that protrudes to the opposite side through the upper side of the beam 10, and a control board 20 that controls the operation of the mounting head 7 is located above the beam 10. Is provided. The control board 20 is connected to a main control unit (not shown) and a power source for controlling the operation of the entire electronic component mounting apparatus 1, and the connection cable is wired on the opposite side of the slider 12 with the beam 10 in between. In FIG. 4, a wiring box 22 that forms a wiring path of the connection cable 21 is provided on the side of the beam 10 in the Y direction.

  The wiring box 22 is a long cylindrical body, one end of which is fixed to the protruding portion of the upper arm 12 a of the slider 12, and the other end is fixed to the lower bracket 23. The lower bracket 23 extends in the X direction from the lower side of the beam 10, and the other end of the wiring box 22 opens toward one end where the beam 10 is supported by the first linear motion device 5. To be fixed. The wiring cable 21 connected to the control board 20 is guided to one end side of the beam 10 and connected to the main control unit via the second linear motion device 5. The wiring box 22 is flexible and facilitates the wiring path of the connection cable 21 formed between one end that moves as the slider 12 moves in the X direction and the other end fixed to the lower bracket 23. It can be changed to.

  As described above, in the second linear motion device 6, the beam 10 is disposed at a predetermined position in consideration of the weight balance of the wiring path of the control board 20, the mounting head 7, and the connection cable 21 that are relatively heavy. Thus, the weight balance acting on the beam 10 is adjusted. In particular, by bringing the center of the weight balance closer to the center of the cross section of the beam 10, the load applied to the guide block 28 that engages the slider 27 with the guide 26 becomes substantially uniform, so the frictional force generated between the guide 26 and the guide block As a result, the slider 27 can be smoothly moved, and uneven wear can be prevented, thereby improving durability. Further, since deformation such as twisting of the beam 10 is suppressed, it is possible to prevent the smooth movement of the slider 12 and the deterioration of positioning accuracy. Note that the control board 20 can be disposed below the beam 10, and the position in the Y direction may be displaced in consideration of the weight balance of the wiring paths of the mounting head 7 and the connection cable 21.

  In this embodiment, a linear motor is used as the linear motion mechanism for moving the slider 12. However, a feed screw mechanism is used instead of the linear motor, and the stator functioning as a fixed portion is replaced with a feed screw driving portion. It is also possible to replace the mover that functions as the movable part with a nut that is screwed into the feed screw. In this case, the joint portions 19 of the cylindrical bodies 10a, 10b, and 10c having a rectangular cross-section constituting the beam 10 serve as ribs, and the mounting rigidity of the feed screw driving portion is improved. Thus, the smooth movement of the nut is not hindered, and a decrease in the positioning accuracy of the slider 12 can be prevented. In addition to the mounting head 7, the slider 12 can be mounted with an imaging device such as a camera, a paste application device, and the like, and positioning accuracy is improved and quality is improved regardless of which device is mounted. Can be improved.

  According to the present invention, the control board is arranged either above or below the beam, the head and the wiring path are arranged on both sides of the beam, the weight balance acting on the beam is adjusted, and the center of gravity is set to the center of the cross section of the beam. Therefore, it has the advantage that deformation such as twisting of the beam can be prevented, and is useful in the field of mounting electronic components.

The perspective view of the electronic component mounting apparatus of this Embodiment The perspective view of the linear motion apparatus of this Embodiment AA sectional view of FIG. Side view of linear motion device of the present embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic component mounting apparatus 2a Work surface 6 2nd linear motion apparatus 7 Mounting head 8 Board | substrate 10 Beam 11 Guide 12 Slider 13 Movable element 14 Stator 20 Control board 21 Connection cable 22 Wiring box

Claims (2)

A beam extended in one direction parallel to the work surface, a guide provided to the beam extending in the one direction, a slider provided on the guide to be movable in the one direction, and the slider A linear motion mechanism that moves in one direction, a control board for controlling the operation of the head provided in the slider, a wiring path for guiding wiring connected to the control board to one end side of the beam, With
A linear motion device in which the control board is disposed either above or below the beam, and the head and the wiring path are disposed on both sides of the beam. An electronic component mounting apparatus comprising the work surface and the linear motion device,
An electronic component mounting apparatus, wherein an electronic component mounting head is provided on the slider, and the electronic component is mounted on a substrate on the work surface.

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