JP6464360B2 - Linear motion device and electronic component mounting device - Google Patents

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 electronic component mounting field, an electronic component mounting apparatus is known that mounts a component on a board using a mounting head that can be moved in the horizontal direction by a linear motion device. As a linear motion device, a beam made of metal (for example, iron or aluminum) extending in one horizontal direction is provided, and a mounting head is moved along the beam by driving a moving mechanism such as a linear motor or a feed screw mechanism. The thing of the structure is used (for example, refer patent document 1).

  In the prior art example shown in Patent Document 1, two rails (guides) extending in one direction are installed on the beam. Each rail is provided with a slide block (guide block) movable along the rail, and a slider on which a mounting head is mounted is coupled to the two slide blocks. The beam is provided with a plate-like stator extending in one direction, and the slider is provided with a rectangular parallelepiped on the surface facing the stator, and a linear motor is formed by the stator and the mover. ing. In a linear motor, when a magnetic flux is generated by passing an electric current through a coil built in the mover, a propulsive force is generated in the mover due to an attractive force / repulsive force acting between the permanent magnets arranged on the stator. Then the slider moves.

JP 2008-108950 A

  However, Patent Document 1 has the following problems due to the attractive force / repulsive force acting between the stator and the mover. That is, in addition to the propulsive force that moves the slider along the rail, a force that pulls the slider in the direction of the rail and a force that pushes the slider in the direction opposite to the rail are also generated between the stator and the mover. Due to this force, a frictional force is generated between the rail and the slide block, and when the slider moves, the portion where the rail and the slide block are in contact with each other wears. For this reason, a large-sized rail and a slide unit are required in consideration of the product life, and there is a problem that the beam and the slider are limited in weight and size.

  Therefore, an object of the present invention is to provide a linear motion device and an electronic component mounting device that can reduce the weight and size of a beam and a slider.

  The linear motion device of the present invention is provided with a beam extending in one direction parallel to the work surface, a rail provided extending in the one direction on the beam, and movable on the rail in the one direction. A slider, a mover provided on the slider, and a stator that is provided so as to extend in the one direction on the beam and is disposed so that the upper and lower surfaces are sandwiched between the mover.

  An electronic component mounting apparatus according to the present invention is provided with a beam extending in one direction parallel to a work surface, a rail provided extending in the one direction on the beam, and movable on the rail in the one direction. A linear motion device having a slider, a mover provided on the slider, and a stator that is provided so as to extend in the one direction on the beam and is arranged so that upper and lower surfaces are sandwiched between the mover A mounting head for holding the electronic component on the slider and mounting the electronic component on the substrate, and mounting the electronic component on the substrate on the work surface.

  According to the present invention, the beam and the slider can be reduced in weight and size.

The perspective view of the electronic component mounting apparatus in one embodiment of this invention Structure explanatory drawing of the linear motion mechanism with which the electronic component mounting apparatus in one embodiment of this invention was equipped 1 is a partially enlarged perspective view of a beam and a slider constituting a linear motion mechanism provided in an electronic component mounting apparatus according to an embodiment of the present invention. Structure explanatory drawing of the slider which comprises the linear motion mechanism with which the electronic component mounting apparatus in one embodiment of this invention was equipped

  First, an electronic component mounting apparatus 1 according to an embodiment of the present invention will be described with reference to FIGS. The electronic component mounting apparatus 1 has a function of mounting an electronic component 3 (see FIG. 2) on a substrate 2. Hereinafter, the conveyance direction of the substrate 2 is defined as the X direction, the direction orthogonal to the X direction in the horizontal plane is defined as the Y direction, and the direction orthogonal to the horizontal plane is defined as the Z direction.

  A substrate transport mechanism 5 having a pair of transport conveyors extending in the X direction is provided at the center of the base 4. The substrate transport mechanism 5 transports the substrate 2 and positions it at a predetermined mounting work position. On both sides of the substrate transport mechanism 5, component supply units 6 are respectively arranged. The component supply unit 6 includes a carriage 7a disposed on both sides of the base 4 and a plurality of tape feeders 7b attached to the carriage 7a. The tape feeder 7b pitches a carrier tape (not shown) holding the electronic component 3 to supply the electronic component 3 to a component take-out position by a mounting head 11 described later.

  A first linear motion mechanism 8 (linear motion device) is provided above the base 4. The first linear motion mechanism 8 is supported via a joint bracket 10 on Y-axis moving tables 9 provided on both sides of the base 4 in the X direction. The Y-axis moving table 9 is provided with a linear drive mechanism, and has a guide member 9a extending in the Y direction. A slide block included in the joint bracket 10 is attached to the guide member 9a so as to be movable in the Y direction. The Y-axis movement table 9 is a second linear motion mechanism that moves the first linear motion mechanism 8 in a horizontal direction (Y direction) orthogonal to one direction (X direction).

  A mounting head 11 is mounted on the first linear motion mechanism 8 so as to be movable in the X direction. The first linear motion mechanism 8 and the second linear motion mechanism constitute an XY movement mechanism that moves the mounting head 11 in the X direction and the Y direction of the work surface. The mounting head 11 includes a suction nozzle 12 (see FIG. 2). The mounting head 11 picks up and picks up the electronic component 3 supplied up to the component pick-up position by the suction nozzle 12. The XY moving mechanism positions the mounting head 11 holding the electronic component 3 with respect to the substrate 2. Thereafter, the mounting head 11 mounts the electronic component 3 on the substrate 2. As described above, the electronic component mounting apparatus 1 positions the mounting head 11 holding the electronic component 3 on the substrate 2 by the XY moving mechanism, and mounts the electronic component 3 on the substrate by the positioned mounting head 11.

  Next, the structure of the first linear motion mechanism 8 will be described with reference to FIGS. FIG. 3 shows a state in which the mounting head 11 is not attached to the first linear motion mechanism 8. The first linear motion mechanism 8 (linear motion device) includes a beam 13 extended in the X direction (one direction parallel to the work surface) and two rails 14 provided in the beam 13 extending in the X direction. I have. The first linear motion mechanism 8 includes a slider 15 provided in the rail 14 and movable in the X direction, and a linear motor 16 that moves the slider 15. The electronic component mounting apparatus 1 includes a first linear motion mechanism 8, a mounting head 11 that holds the electronic component 3 on the slider 15 and mounts it on the substrate 2 is provided, and the electronic component 3 is mounted on the substrate 2 on the work surface. Implement the implementation.

  The beam 13 is formed of a metal such as iron or aluminum and has a cylindrical shape extending in the X direction, and a plurality of (four in the example of FIGS. 2 and 3) hollow portions 17 are lightened. It is provided for the purpose. The cross-sectional shape of the beam 13 is substantially U-shaped consisting of a vertically long barrel portion 13b and two arm portions 13a and 13c extending horizontally from the top and bottom of the barrel portion. At the front portions of the arm portions 13a and 13c, metal rails 14 are provided so as to extend in the X direction (longitudinal direction of the beam 13).

  A slide block 18 is provided on each of the two rails 14 so as to be movable in the X direction along the rails 14. The two slide blocks 18 are fixed to two upper and lower portions on one side of the flat slider 15. A locking portion 19 is provided on the opposite surface of the slider 15 to which the slide block 18 is fixed. The mounting head 11 is engaged and attached to the locking portion 19. With the mounting head 11 mounted, a gap 20 is formed between the mounting head 11 and the slider 15 with the locking portion 19 as a spacer.

  Next, the linear motor 16 that moves the mounting head 11 in the X direction will be described. The linear motor 16 includes a stator 21 provided on the beam 13 side and extending in the X direction and a mover 22 provided on the mounting head 11 side. The stator 21 is disposed at a position between the two arm portions 13 a and 13 c at the approximate center of the body portion 13 b of the beam 13. The stator 21 includes a flat iron plate member parallel to the rail 14 and a magnet member disposed on the surface of the iron plate member.

  The mover 22 is disposed on the surface of the slider 15 on the side where the slide block 18 is fixed, with a spacer 23 interposed therebetween. A gap 24 is formed by a spacer 23 between the mover 22 and the slider 15. The mover 22 has a substantially U-shaped cross section, and surrounds the stator 21 with a slight gap. As described above, the first linear motion mechanism 8 is provided with the movable element 22 provided on the slider 15 and the beam 13 extending in the X direction (one direction parallel to the work surface). Is provided with a stator 21 arranged so as to be sandwiched.

  When a magnetic flux is generated by passing a current through a coil built in the mover 22, propulsion in the X direction is applied to the mover 22 by an attractive force and a repulsive force acting between the magnet member of the stator 21 and the mover 22. A force (arrows a and b in FIG. 3) is generated. Using this propulsive force, the mounting head 11 moves along the rail 14.

  The linear motor 16 of the present embodiment has a structure in which the upper and lower surfaces of the stator 21 are sandwiched between the movers 22. With this structure, most of the attractive force and the repulsive force generated between the stator 21 and the movable element 22 act as a propulsive force in the X direction, and the slider 15 is attracted to the beam 13 (arrow c in FIG. 2). It hardly acts in the direction of pushing back (arrow d in FIG. 2). Therefore, even when a propulsive force is generated in the linear motor 16, the friction force generated when the slide block 18 is pressed against the rail 14 is small and wear is small, so that the rail 14 and the slide block 18 are determined in consideration of the product life. Can be reduced in size.

  Further, when a force for attracting the slider 15 to the beam 13 (arrow c in FIG. 2) is applied, the beam 13 has a force that pulls the upper and lower arms 13a and 13c to the body 13b in the direction of the slider 15 (FIG. 2). Is generated, the beam 13 is deformed. In order to counteract this force and prevent the deformation of the beam 13, it is necessary to increase the strength of the main body of the beam 13, and the beam 13 becomes larger and heavier. However, since the force acting in the direction of arrow e is small in the linear motor 16 of the present embodiment, the structure of the beam 13 is made thin (the ratio of the cavity portion 17 is increased), and the beam 13 is reduced in size and weight. can do. Thus, the first linear motion mechanism 8 (linear motion device) can be reduced in weight by reducing the size and weight of the rail 14, the slide block 18, and the beam 13.

  Next, the cooling fan 25 that cools the mover 22 provided on the slider 15 will be described with reference to FIGS. FIG. 4 shows a front view of the slider 15 as viewed from the side where the slide block 18 and the mover 22 are provided. When a current flows through the coil of the mover 22, heat is generated in the mover 22 due to the loss of the coil. A part of the generated heat is radiated by natural convection of air or an air flow generated when the mover 22 moves. However, when the movable element 22 is continuously moved by a small amount, the effect of heat radiation due to the air flow generated by the movement of the movable element 22 cannot be obtained, and the generated heat raises the temperature of the movable element 22 and its surroundings.

  If the temperature rise due to heat generation of the mover 22 exceeds an allowable value, there is a possibility that problems such as deformation of the slider 15 and the beam 13 and burning of the coil of the mover 22 may occur. Therefore, a cooling fan 25 that cools the mover 22 is provided on the surface of the slider 15 that faces the mover 22. The cooling fan 25 is disposed in the opening 26 that penetrates the slider 15.

  The cooling fan 25 blows air sucked from the gap 20 on the mounting head 11 side to the mover 22 and discharges it from the gap 24 on the mover 22 side. By generating an air flow with the cooling fan 25 and forcibly cooling, the temperature rise of the mover 22 can be kept within an allowable value. At this time, the air flow is smoothed by the gaps 20 and 24 provided on the front and rear surfaces of the slider 15, and the cooling fan 25 can cool the mover 22 efficiently.

  Thus, in the first linear motion mechanism 8 (linear motion device), the slider 15 has the opening 26 on the surface facing the movable element 22, and the cooling fan 25 is provided in the opening 26. The positions and shapes of the cooling fan 25 and the opening 26 are not limited to the present embodiment. In other words, the cooling fan 25 only needs to be provided on the slider 15 so as to move integrally with the slider 15 and forcibly cool the movable element 22 by the generated air flow. By providing the cooling fan 25 on the slider 15, it is possible to prevent a malfunction due to heat generation of the linear motor 16 even in an operation mode in which heat is easily generated such as continuous operation of minute movement.

  As described above, the first linear motion mechanism 8 (linear motion device) in the present embodiment has the beam 13 stretched in one direction (X direction) parallel to the work surface and the beam 13 stretched in the X direction. Rail 14 provided on the rail 14, a slider 15 provided on the rail 14 so as to be movable in the X direction, a mover 22 provided on the slider 15, and a beam 13 extending in the X direction. The stator 21 is arranged so that the upper and lower surfaces are sandwiched between the two. As a result, it is possible to suppress the generation of the attractive force and the repulsive force acting in the Y direction between the stator 21 and the movable element 22, and the countermeasure against the trouble caused by the force acting in the Y direction becomes unnecessary. The rail 14, the slider 15, and the slide block 18 can be reduced in size and weight.

  The linear motion device and the electronic component mounting apparatus of the present invention have an effect that the beam and the slider can be reduced in weight and size, and are useful in the component mounting field in which components are mounted on a substrate.

DESCRIPTION OF SYMBOLS 1 Electronic component mounting apparatus 2 Board | substrate 3 Electronic component 8 1st linear motion mechanism (linear motion apparatus)
11 Mounting Head 13 Beam 14 Rail 15 Slider 21 Stator 22 Movable Element 23 Spacer 25 Cooling Fan 26 Opening

Claims (2)

A beam stretched in one direction parallel to the work surface;
A rail provided extending in the one direction on the beam;
A slider provided on the rail so as to be movable in the one direction;
A mover provided on the slider;
The beam is provided to extend in the one direction, and includes a stator arranged so that upper and lower surfaces are sandwiched between the movers ,
The mover is disposed on the slider with a spacer interposed therebetween,
The slider is provided with a cooling fan for cooling the mover ,
The slider has an opening on a surface facing the mover,
The cooling fan is a linear motion device provided in the opening . A beam extended in one direction parallel to the work surface, a rail provided extending in the one direction on the beam, a slider provided on the rail so as to be movable in the one direction, and provided in the slider A component mounting apparatus comprising: a movable element, and a linear motion device having a stator that is provided so as to extend in the one direction on the beam and is arranged so that an upper and lower surface is sandwiched between the movable elements. ,
The slider holding the electronic component mounting head to be mounted on the substrate is provided on, have row mounting of electronic components on a substrate in said working surface,
The mover is disposed on the slider with a spacer interposed therebetween,
The slider is provided with a cooling fan for cooling the mover,
The slider has an opening on a surface facing the mover,
The cooling fan is an electronic component mounting apparatus provided in the opening .

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