JP2005158924A - Direct drive mechanism of electronic component mounting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic component mounting apparatus and a direct drive mechanism for reducing cost of facilities, without requiring high accuracy mounting surface in the direct drive mechanism employing position detection with a linear scale. <P>SOLUTION: In a Y-direct drive mechanism 6 for directly driving a drive object in the first direction with a linear motor allocated in the electronic component mounting apparatus, the position detection signal from the linear scale 30A is received with a position detection unit 32, by providing a guide rail 7A, in which the linear scale 30A is previously loaded to the side surface 7a along the longitudinal direction to the guide for guiding the drive object in the Y direction in combination with a slider 26, and providing the linear scale 31A loaded to a loading bracket 18a extended to the lower side from a moving plate 18 facing made to face the linear scale 30A. Accordingly, facility cost can be reduced, without requiring high precision mounting of surfaces. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a linear motion mechanism that is disposed in an electronic component mounting apparatus such as an electronic component mounting apparatus and linearly drives a driven body such as a mounting head by a driving source such as a linear motor.

In an electronic component mounting apparatus such as an electronic component mounting apparatus, a linear motion mechanism is often used as a head moving mechanism that moves a work head such as a mounting head. As a linear motion mechanism, a linear motion mechanism of a type in which linear motion is performed directly by a linear motor in recent years is used instead of a linear motion mechanism of the type that converts the rotational motion of a motor conventionally used to a linear motion by a ball screw. (See, for example, Patent Documents 1, 2, and 3).
JP 11-352265 A JP 2000-316269 A JP 2003-140749 A

  By the way, in a drive mechanism using a linear motor, the position of the driven body cannot be detected by an encoder built in the motor, unlike a drive mechanism using a general rotary motor. Requires a linear scale to detect position directly. However, in the linear motion mechanism shown in the above-mentioned prior art example, in order to dispose the linear scale in the driving direction, a mounting surface finished with high precision is provided by machining on a fixed surface such as a frame member of the mechanism portion. It was necessary, and it was one factor of the cost increase of the equipment cost.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a linear motion mechanism for an electronic component mounting apparatus that can reduce equipment costs without requiring a highly accurate mounting surface in a linear motion mechanism using position detection by a linear scale. And

  The linear motion mechanism of the electronic component mounting apparatus according to the present invention is a linear motion that is disposed in an electronic component mounting apparatus that performs a mounting operation for mounting an electronic component on a board and linearly drives a driven body in a first direction by a drive source. A mechanism for guiding the driven body in a first direction; a drive transmission section for transmitting a driving force of the driving source to the driven body; and the guide section coupled to the driven body. A linear scale mounted in a first direction on a guide rail used in combination with a slider, and connected to the driven body or the drive transmission portion and mounted at a position facing the linear scale together with the driven body. A scale head that moves in one direction and outputs a relative position signal in the first direction relative to the linear scale; and a position that receives the relative position signal and detects the position in the first direction of the driven body. And a detection unit.

  According to the present invention, the position detection by the linear scale is used by mounting the linear scale along the first direction on the guide rail used in combination with the slider as a guide portion for guiding the driven body in the first direction. In the linear motion mechanism, a high-accuracy mounting surface is not required, and the equipment cost can be reduced.

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of an electronic component mounting apparatus according to an embodiment of the present invention. FIGS. 2, 4 and 6 are cross-sectional views of the electronic component mounting apparatus according to an embodiment of the present invention. FIG. 7 is an explanatory view of the structure of the drive transmission unit of the moving beam in the electronic component mounting apparatus according to the embodiment of the present invention.

  First, the structure of the electronic component mounting apparatus will be described with reference to FIGS. In FIG. 1, a conveyance path 2 is disposed in the X direction on a gantry 1 of the electronic component mounting apparatus. The transport path 2 transports the substrate 3 on which electronic components are mounted, and positions the substrate 3 on the two mounting stages S1 and S2 set on the transport path 2. The mounting stages S1 and S2 each include a component supply unit 4 in which a plurality of parts feeders 5 are arranged in parallel on both sides, and a mounting mechanism that takes out electronic components from the component supply unit 4 and mounts them on the substrate 3.

  The mounting mechanism will be described. Two Y linear motion mechanisms 6 are arranged in the Y direction between the mounting stages S1 and S2. The Y linear motion mechanism 6 is a linear motion mechanism driven by a linear motor, as will be described later. By this linear motion mechanism, the X linear motion mechanism 8 guided at both ends by two guide rails 7 and 7A is moved in the Y direction. Move to. Similarly, the X linear motion mechanism 8 is a linear motion mechanism driven by a linear motor, and moves the mounting head 9 in the X direction by this linear motion mechanism.

  As shown in FIG. 2, the mounting head 9 is a multi-type mounting head including a plurality of unit mounting heads 9a, and holds and holds electronic components by suction nozzles 12 provided in each unit mounting head 9a. The mounting head 9 is provided with a substrate recognition camera 13 that moves integrally. The substrate recognition camera 13 moves on the substrate 3 together with the mounting head 9 to recognize its position.

  By driving the Y linear motion mechanism 6 and the X linear motion mechanism 8, the mounting head 9 moves in the XY direction, whereby an electronic component is picked up from the parts feeder 5 of the component supply unit 4 and transferred and mounted on the substrate 3. . A line camera 10 and a nozzle stocker 11 are disposed between the component supply unit 4 and the conveyance path 2. When the mounting head 9 that has taken out the electronic component from the component supply unit 4 passes above the line camera 10, the electronic component held by the mounting head 9 is recognized. The nozzle stocker 11 accommodates suction nozzles 12 mounted on the unit mounting heads 9a for each type of electronic component. When the mounting head 9 accesses the nozzle stocker 11, the suction nozzles 12 are automatically replaced. Done.

  Next, the Y linear motion mechanism 6 will be described with reference to FIG. The Y linear motion mechanism 6 is disposed in an electronic component mounting apparatus used for mounting work for mounting an electronic component on a substrate, such as the above-described electronic component mounting apparatus, and is a driven body by a linear motor as a drive source. A function of linearly driving the X linear motion mechanism 8 in the Y direction (first direction), a drive transmission unit that transmits the drive of the linear motor to the X linear motion mechanism 8, and movement of the X linear motion mechanism 8 in the Y direction The guide part which guides is provided.

  That is, as shown in FIG. 3, a guide rail 7 </ b> A is disposed in the Y direction on the gantry 1, and the slider 26 slidably fitted to the guide rail 7 </ b> A is connected to the X linear motion mechanism 8. It is coupled to the lower surface of the connecting member 25. The guide rail 7A, the slider 26, and the connecting member 25 serve as a guide portion that guides the X linear motion mechanism 8 in the first direction. In this guide portion, the guide rail 7A is used in combination with the slider 26. The guide rail 7A is obtained by mounting a linear scale for position detection in advance on a guide rail 7 for a normal linear guide.

Reference numeral 15 denotes a longitudinal bracket constituting the Y linear motion mechanism 6, which is disposed on the gantry 1 in a vertical posture in the Y direction (first direction). Fixed to the side surface of the longitudinal bracket 15 is a stator 16 of a linear motor that is configured with a stator 16 and a mover 17 facing each other. A moving plate 18 is coupled to the back surface of the mover 17 (the surface opposite to the surface facing the stator 16). Is bound to. Thereby, the driving force of the mover 17 is transmitted to the connecting member 25 through the flange portion 19. The moving plate 18 and the connecting member 25 serve as a drive transmission unit that transmits the driving force in the Y direction of the linear motor that is the driving source to the X linear motion mechanism 8 that is the driven body.

  A plurality of guide rollers 21 are attached to the upper end and lower end of the moving plate 18 in a posture in which the axial direction is directed vertically. The guide roller 21 is in contact with the guide rail 20 disposed on the side surface of the longitudinal bracket 15 in the Y direction. When the moving plate 18 is driven by the mover 17, the guide roller 21 rolls along the guide rail 20.

  When the linear motor is in operation, a magnetic attraction force acts between the movable element 17 and the stator 16, and this attraction force is supported by a reaction force caused by the guide roller 21 abutting against and pressing the guide rail 20. . As a result, the suction force does not act on the guide portion in which the guide rail 7 and the slider 26 are combined, and the guide portion operates in a heavy load state even when the X linear motion mechanism 8 moves in the Y direction at a high speed. The life of parts can be ensured.

  A plurality of guide rollers 23 are mounted on the plate 22 fixed to the upper end of the moving plate 18 with the axial direction oriented horizontally. A guide groove 24 into which the guide roller 23 is fitted is formed at the upper end of the longitudinal bracket 15 in the Y direction. When the moving plate 18 moves together with the mover 17, the guide roller 23 is guided by the guide groove 24. Roll inside. Thereby, the position of the moving plate 18 in the Z direction is maintained.

  Next, the position detection mechanism in the Y linear motion mechanism 6 will be described. As described above, among the guide rails that guide the movement in the Y direction of the X drive mechanism 8, the guide rail 7A on the Y linear motion mechanism 6 side is mounted with the linear scale 30A for position detection in advance. Is used. The linear scale 30A is mounted along the longitudinal direction in the side surface 7a on the linear motor side of the guide rail 7A in a range avoiding the bearing portion 27 combined with a ball or a roller interposed between the slider 26 and the like. Yes.

  As shown in FIG. 3, a mounting bracket 18a extends downward from the lower end of the moving plate 18 constituting the drive transmission unit, and the scale head 31A has a detection surface on the linear scale 30A. It is mounted to face. The scale head 31A moves in the first direction together with the driven body when the X linear motion mechanism 8 as the driven body moves in the Y direction, and outputs a relative position signal in the Y direction with respect to the linear scale 30A. The scale head 31A is connected to a position detection unit 32 provided in the control unit of the electronic component mounting apparatus, and the position detection unit 32 receives the relative position signal from the scale head 31A and receives the Y of the X linear motion mechanism 8. Detect the position of the direction.

  In the linear motion mechanism that uses a linear scale as the position detection mechanism, a mounting surface that is finished with high precision on the fixed surface of the frame member, etc. of the mechanism by adopting a configuration in which the linear scale is mounted on the guide rail as described above. Need not be provided by machining. Thereby, the cost required for machining and the trouble of incorporating the linear scale into the mechanism portion can be saved, and the equipment cost can be reduced.

In the above example, the linear scale 30A is mounted on the side surface of the guide rail 7A on the linear motor side, but a mounting method as described below may be used. 4 and 5 show an example in which a linear scale 30B similar to the linear scale 30A is mounted on the upper surface 7b of the guide rail 7B. In this example, as shown in FIG. 5, the linear scale 30B is mounted on the guide rail 7B using a gap existing between the upper surface of the guide rail 7B and the slider 26. The scale head 31B facing the linear scale 30B is mounted on the mounting bracket 18a extending from the moving plate 18 to the upper side of the guide rail 7B in the horizontal direction with the detection surface directed downward.

  6 and 7 show an example in which a linear scale 30C similar to the linear scale 30A is mounted on the side surface 7c opposite to the linear motor side of the guide rail 7C. In this example, the scale head 31 </ b> C facing the linear scale 30 </ b> C is mounted on a mounting bracket 25 a that extends downward from the connecting member 25. These three mounting examples are selected in consideration of interference with other parts constituting the mechanism.

  In the above example, the Y linear motion mechanism 6 has been described, but the same configuration is applied to the X linear motion mechanism 8 that moves the mounting head 9. That is, in the application example to the X linear motion mechanism 8, the X direction is the first direction, and the mounting head 9 is the driven body. Even in this case, the guide rail used in the guide section has the above-described configuration.

  In this embodiment, an example of an electronic component mounting apparatus that mounts an electronic component on a substrate is shown as an electronic component mounting apparatus. However, the present invention is also applied to a mounting apparatus that constitutes an electronic component mounting line such as a screen printing apparatus. Can be applied. Furthermore, the present invention can be applied not only to a linear motion mechanism using a linear motor as a drive source, but also to a linear motion mechanism using a normal rotary motor as a drive source.

  The linear motion mechanism in the electronic component mounting apparatus according to the present invention has an effect that the linear motion mechanism using the position detection by the linear scale does not require a highly accurate mounting surface and can reduce the equipment cost. It is useful for a linear motion mechanism that is disposed in an electronic component mounting apparatus such as an electronic component mounting apparatus and linearly drives a driven body such as a mounting head.

The top view of the electronic component mounting apparatus of one embodiment of this invention Sectional drawing of the electronic component mounting apparatus of one embodiment of this invention Structure explanatory drawing of the drive transmission part of the moving beam of the electronic component mounting apparatus of one embodiment of this invention Sectional drawing of the electronic component mounting apparatus of one embodiment of this invention Structure explanatory drawing of the drive transmission part of the moving beam of the electronic component mounting apparatus of one embodiment of this invention Sectional drawing of the electronic component mounting apparatus of one embodiment of this invention Structure explanatory drawing of the drive transmission part of the moving beam of the electronic component mounting apparatus of one embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic component mounting apparatus 2 Conveyance path 3 Board | substrate 4 Component supply part 6 Y linear motion mechanism 7, 7A, 7B, 7C Guide rail 8 X linear motion mechanism 9 Mounting head 18 Moving plate 25 Connecting member 30A, 30B, 30C Linear scale 31A , 31B, 31C Linear head

Claims (3)

  A linear motion mechanism that is disposed in an electronic component mounting apparatus that performs a mounting operation for mounting an electronic component on a substrate and linearly drives the driven body in a first direction by a driving source, and the driven body is moved in the first direction. A guide portion for guiding, a drive transmission portion for transmitting a driving force of the drive source to the driven body, and a guide rail used in combination with the slider coupled to the driven body in the guide portion in the first direction And a linear scale mounted along the driven body or the drive transmission unit, mounted at a position facing the linear scale and moved in the first direction together with the driven body in the first direction with respect to the linear scale. An electronic unit comprising: a scale head that outputs a relative position signal; and a position detection unit that receives the relative position signal and detects a position of the driven body in a first direction. Linear motion mechanism of the mounting apparatus.   2. The linear motion mechanism for an electronic component mounting apparatus according to claim 1, wherein the drive source is a linear motor. In a linear motion mechanism that linearly drives a driven body in a first direction by a driving source, the guide rail is used in combination with a slider coupled to the driven body as a guide portion that guides the driven body in the first direction. A guide rail, wherein a linear scale is mounted along the first direction.

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