JP6304855B2 - Electronic component mounting equipment - Google Patents

Description

  The present invention relates to an electronic component mounting apparatus for mounting an electronic component such as an IC chip on a printed board. In this specification, an electronic component mounting apparatus is simply referred to as a mounting apparatus, an electronic component is simply referred to as a component, and a printed circuit board is simply referred to as a board.

  The mounting apparatus is configured such that an electronic component is sucked from a component supply unit by a mounting head having a nozzle, transferred onto a printed board, and mounted at a predetermined position on the printed board.

  In recent years, due to a demand for improving mounting efficiency, a multiple mounting head equipped with a plurality of nozzles is often used as a mounting head. By using a multiple mounting head, a plurality of components can be mounted in one mounting cycle in which the mounting head reciprocates once between the component supply unit and the substrate.

  Such a multiple mounting head requires a nozzle rotation drive mechanism that rotates a plurality of nozzles around the nozzle axis (θ direction) (for example, Patent Document 1). FIG. 5 shows a nozzle rotation drive mechanism of Patent Document 1.

  In Patent Document 1, a plurality of nozzles 40 are arranged as two nozzle rows, a plurality of fixed idler pulleys 41 are arranged in the middle of the two nozzle rows, and the drive teeth of the endless belt 42 are provided. The surface (inner side) is routed around the drive pulley 43 attached to the drive shaft of the rotary motor and the driven pulley 44 attached to each nozzle, and the opposite surface (outer side) of the drive surface is guided by the fixed idler pulley 41. ing.

  However, in the nozzle rotation drive mechanism of Patent Document 1, the drive surface of the endless belt is wound around the drive pulley and the driven pulley, and the opposite surface of the drive surface is guided by the fixed idler pulley. Influenced by thickness variation in direction (rotation direction). That is, the thickness of the endless belt in the longitudinal direction varies (varies) even within a predetermined dimensional tolerance range. In Patent Document 1, the endless belt rotates while the pulley is in contact with both the driving surface (inner side) and the opposite surface (outer side) of the endless belt. Tension also fluctuates. When the tension of the endless belt fluctuates, the positioning accuracy of the nozzle in the θ direction decreases.

  Further, in the example shown in FIG. 5, eight nozzles 40 are rotated by one endless belt 42, and the endless belt 42 is also wound around the fixed idler pulley 41. Resistance increases. As a result, the elongation generated in the endless belt 42 increases and the time for restoring the elongation also increases, and the positioning accuracy of the nozzle in the θ direction decreases. Furthermore, since the number of times the endless belt 42 is bent increases, the life of the endless belt 42 is shortened. Also, in one mounting cycle in which the mounting head reciprocates once between the component supply unit and the substrate, the endless belt 42 is rotated for positioning in the θ direction for each of the eight nozzles 40. The number of rotations of the endless belt 42 increases, and the life of the endless belt 42 is shortened from this point.

  As in the above-mentioned Patent Document 1, as a nozzle rotation drive mechanism that rotates a plurality of nozzles arranged in two rows in the θ direction, Patent Document 2 uses an upper and lower endless belt and uses a single rotary motor. A mechanism for rotating two nozzle rows in the θ direction is disclosed. However, in the nozzle rotation drive mechanism of Patent Document 2, the endless belt rotates while the pulley is in contact with both the drive surface and the opposite surface of the endless belt, and the number of times of bending is large. It has the same problem as the drive mechanism.

JP 2010-93177 A Japanese Patent No. 3649091

  The problem to be solved by the present invention is to increase the life of an endless belt used for rotating each nozzle around the nozzle axis (θ direction) in an electronic component mounting apparatus including a mounting head in which a plurality of nozzles are arranged. It is possible to improve the positioning accuracy of each nozzle in the θ direction.

The present invention relates to a mounting head in which a plurality of nozzles are arranged in one or a plurality of rows for sucking and mounting electronic components on a printed circuit board, a drive pulley mounted on a drive shaft of a rotary motor, and rotating together with each nozzle. In the electronic component mounting apparatus, the driven pulley includes: an endless belt wound around the driven pulley and the driven pulley and the driven pulley, wherein the plurality of nozzles rotate around a nozzle axis by rotation of the rotary motor, respectively. The shaft is provided with upper and lower two-stage drive pulleys, and the driven pulleys of the nozzles are alternately arranged in the upper and lower directions in the nozzle row direction so as to correspond to the upper and lower two-stage drive pulleys. the endless belt is hooked around to the two driven pulleys corresponding to each of said drive shaft, the row of nozzles is rotated by the driving pulley of the upper and lower stages Disposed between one end of the nozzle and the other end of the nozzle to be formed, and, with only inside each endless belt is in contact with said drive pulley and said two driven pulleys, to contact the outside of the endless belt locking The idler pulley and the movable idler pulley are not arranged, the upper and lower two-stage driving pulleys rotate two nozzles, respectively, and each endless belt is connected to the upper and lower two-stage driving pulleys and the two nozzles. The driven pulley and the driven pulley are looped around so as to have a triangular shape with the driven pulley as the apex and the inner angles are all 90 ° or less, and the position of the drive shaft can be adjusted. It is characterized by.

  In the present invention, a plurality of drive pulleys are provided on the drive shaft of the rotary motor, and an endless belt is wound around each drive pulley and one or a plurality of driven pulleys corresponding thereto. That is, since a plurality of endless belts are wound around one drive shaft, all the nozzles can be rotated while reducing the number of nozzles rotated by one endless belt. Accordingly, the resistance during operation of the endless belt can be reduced, and the number of bendings can be reduced, so that the life of the endless belt can be extended.

  Furthermore, in the present invention, only the inner side of each endless belt is in contact with the driving pulley and the driven pulley, and the stationary idler pulley that is in contact with the outer side of each endless belt is not disposed, so that the thickness in the longitudinal direction of the endless belt varies. Even so, the tension of the endless belt does not fluctuate, and the positioning accuracy of each nozzle in the θ direction can be improved.

It is a conceptual diagram which shows the basic composition of the electronic component mounting apparatus of this invention. 2A and 2B are diagrams illustrating a configuration of the mounting head of FIG. 1, in which FIG. 1A is a front view as viewed from the Y direction in FIG. 1, and FIG. It is a top view which shows notionally the nozzle rotation drive mechanism for rotating a nozzle to (theta) direction. It is a top view which shows the other example of a nozzle rotation drive mechanism. It is a top view which shows notionally the conventional nozzle rotation drive mechanism for rotating a nozzle to (theta) direction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a conceptual diagram showing a basic configuration of an electronic component mounting apparatus according to the present invention. The electronic component mounting apparatus has a mounting head 10 for sucking electronic components and mounting them on a printed board. As will be described later, a plurality of nozzles are incorporated in the mounting head 10 so as to be movable up and down and rotatable about the nozzle axis (θ direction).

  The mounting apparatus of FIG. 1 includes two mounting heads 10 that are mounted so as to face a pair of (two) X-direction beams 20 arranged at predetermined intervals in the Y direction. It has been. The mounting head 10 is attached to the X direction beam 20 so as to be movable in the X direction. Further, the X-direction beam 20 is bridged between a pair (two) of Y-direction beams 30 that are orthogonal to the X-direction beam and disposed at a predetermined interval in the X direction, and also along the Y direction beam 30 along the Y direction. It is movably attached. As described above, the combination of the X direction beam 20 and the Y direction beam 30 allows the mounting head 10 to freely move in the X direction and the Y direction within a horizontal plane. The mounting head 10 is moved to a component supply unit (not shown) by a combination of movements in the X direction and the Y direction, sucks the electronic components, and is further transported to the mounting position (not shown). The electronic component is mounted at a predetermined position on the printed circuit board.

  2A and 2B are diagrams showing the configuration of the mounting head 10 of FIG. 1, wherein FIG. 2A is a front view seen from the Y direction in FIG. 1, and FIG. 2B is a side view thereof.

  The mounting head 10 includes a support plate 11 having one surface parallel to the X direction, and twelve nozzles 12 are arranged in a row in the X direction along the one surface of the support plate 10. The nozzle 12 is supported on the support plate 10 so as to be vertically movable and rotatable in the θ direction.

  The nozzle 12 includes a shaft 12a extending vertically. A nozzle tip 12b that adsorbs components is attached to the lower end of the shaft 12a. The upper end of the shaft 12a is connected to the drive shaft of the linear motor 12c through a bearing so that the shaft 12a can rotate in the θ direction. The linear motor 12c is fixed to the support plate 11 and has a built-in linear encoder for detecting the vertical position of the nozzle 12 (shaft 12a). That is, the linear motor 12c moves the nozzle 12 up and down while detecting the vertical position of the nozzle 12 using a linear encoder.

  The mechanism for moving the nozzle 12 (shaft 12a) up and down is not limited to a linear motion actuator mechanism using a linear motor, and may be a known mechanism such as a ball screw mechanism using a servo motor.

  The mounting head 10 includes three rotation motors 13 for rotating the nozzles 12 in the θ direction, and the four nozzles 12 are rotated by one motor 13. FIG. 3 is a plan view conceptually showing a nozzle rotation driving mechanism for rotating the nozzle 12 in the θ direction.

  Hereinafter, the configuration of the nozzle rotation drive mechanism will be described with reference to FIGS. Two (two upper and lower) drive pulleys 14 a and 14 b are attached to the drive shaft 13 a of the rotary motor 13, and a driven pulley is attached to each nozzle 12. The driven pulleys of the nozzles 12 are alternately arranged in the vertical direction so as to correspond to the upper and lower two-stage driving pulleys 14a and 14b, respectively. In FIG. 3, a driven pulley corresponding to the upper drive pulley 14a is indicated by reference numeral 15a, and a driven pulley corresponding to the lower drive pulley 14b is indicated by reference numeral 15b.

  An endless belt 16a is wound around the upper drive pulley 14a and the two driven pulleys 15a corresponding thereto, and an endless belt 16b is wound around the lower drive pulley 14b and the two driven pulleys 15b corresponding thereto. Has been. That is, the endless belts 16a and 16b are arranged in two upper and lower stages. Accordingly, the rotation of the drive shaft 13a of one rotary motor 13 causes the four nozzles 12 to rotate in the θ direction via the endless belts 16a and 16b, respectively, so that the three rotary motors 13 rotate. As a result, all 12 nozzles 12 rotate in the θ direction.

  As described above, since a plurality of (two upper and lower endless) endless belts 16a and 16b are wound around one drive shaft 13a, all the nozzles are rotated while reducing the number of nozzles 12 rotated by one endless belt. be able to. Therefore, the resistance during operation of the endless belts 16a and 16b can be reduced and the number of bendings can be reduced, so that the life of the endless belts 16a and 16b can be extended.

  In the present embodiment, as shown in FIG. 3, only the inner sides of the endless belts 16a and 16b (drive surfaces provided with drive teeth) are in contact with the drive pulleys 14a and 14b and the driven pulleys 15a and 15b. There is no fixed idler pulley that contacts the outside of the belts 16a, 16b. Therefore, even if the longitudinal thickness of the endless belts 16a and 16b varies, the tension of the endless belts 16a and 16b does not vary, and the positioning accuracy of each nozzle 12 in the θ direction can be improved.

  Further, in the present embodiment, the endless belt 16a (16b) hangs around in a triangular shape having one driving pulley 14a (14b) and two driven pulleys 15a (15b) as vertices, and is bent at each vertex. All the interior angles of the portions are set to 90 ° or less. In this way, the drive teeth on the inner side of the endless belts 16a and 16b and the drive pulley 14a are set such that the inner angles of the bent portions having the apexes of the drive pulleys 1a and 14b or the driven pulleys 15a and 15b are all 90 ° or less. , 14b and the driven pulleys 15a, 15b can be sufficiently ensured in the number of meshing teeth (contact angle), so that the positioning accuracy of each nozzle 12 in the θ direction can be improved.

  Furthermore, in this embodiment, in order to be able to adjust the tension of the endless belts 16a and 16b, the position of the drive shaft 13a (drive pulleys 14a and 14b) of the rotary motor 13 can be adjusted. In order to be able to adjust the position of the drive shaft 13a (drive pulleys 14a and 14b), the position of the rotary motor 13 can be adjusted most simply. In order to be able to adjust the position of the rotary motor 13, a well-known configuration such as providing a position adjustment groove on the support base that supports the rotary motor 13 can be adopted.

  In this way, by making it possible to adjust the position of the drive shaft 13a (drive pulleys 14a and 14b), the tension and the balance of the endless belts 16a and 16b can be adjusted. As shown in FIG. The idler pulley can be omitted.

  FIG. 4 shows another example of a nozzle rotation drive mechanism for rotating the nozzle 12 in the θ direction. In the nozzle rotation driving mechanism of FIG. 4A, a movable idler pulley 17 for adjusting the tension of the endless belts 16a and 16b is disposed outside the endless belts 16a and 16b, and the nozzle rotation driving mechanism of FIG. The movable idler pulley 17 is disposed inside the endless belts 16a and 16b.

  When the movable idler pulley 17 is arranged outside the endless belts 16a and 16b as shown in FIG. 4A, there is a concern about fluctuations in tension due to fluctuations in the longitudinal thickness of the endless belts 16a and 16b as described above. Is done. However, since the movable idler pulley 17 is movable, the movable idler pulley 17 can be moved so as to cancel out fluctuations in tension of the endless belts 16a and 16b. Accordingly, the movable idler pulley 17 may be disposed outside the endless belts 16a and 16b.

  On the other hand, in FIG. 4B, since the movable idler pulley 17 is disposed inside the endless belts 16a and 16b, the endless belt 16a, The tension of 16b does not fluctuate.

  However, if the movable idler pulley 17 is arranged as shown in FIGS. 4 (a) and 4 (b), the arrangement space is required and the weight is increased, and the tension adjusting mechanism of the endless belts 16a and 16b is further complicated. Therefore, it is preferable not to use a movable idler pulley as shown in FIG. That is, it is preferable that the endless belts 16a and 16b are wound around only the driving pulleys 14a and 14b and the driven pulleys 15a and 15b.

  In the above embodiment, two rotation pulleys 14a and 14b are provided in one rotary motor 13, and the two nozzles 12 are rotated by the endless belts 16a and 16b wound around the respective drive pulleys 14a and 14b. However, one rotation motor 13 may be provided with four stages of drive pulleys, and each nozzle may be rotated by an endless belt (four) laid around each drive pulley. Further, three or more nozzles may be rotated by one endless belt. However, as described above, in order to reduce the inner angles of the bent portions of the endless belt to 90 ° or less, the number of nozzles rotated by one endless belt is limited to three, and the endless belt is rotated by one endless belt. The number of nozzles is preferably 3 or less, more preferably 2 as in this embodiment.

  Further, in the above embodiment, the plurality of nozzles 12 are arranged in a row, but it is obvious to those skilled in the art that the present invention can also be applied when a plurality of nozzles are arranged in two or more rows. In addition, it goes without saying that the number of nozzles is variable.

DESCRIPTION OF SYMBOLS 10 Mounting head 11 Support plate 12 Nozzle 12a Shaft 12b Nozzle tip 12c Linear motor 13 Rotating motor 13a Drive shaft 14a, 14b Drive pulley 15a, 15b Driven pulley 16a, 16b Endless belt 17 Movable idler pulley 20 X direction beam 30 Y direction beam

Claims (1)

A mounting head in which a plurality of nozzles are arranged in one or a plurality of rows for sucking and mounting electronic components on a printed circuit board, a drive pulley mounted on a drive shaft of a rotary motor, and a driven pulley that rotates with each nozzle An electronic component mounting apparatus comprising an endless belt wound around the drive pulley and the driven pulley, wherein the plurality of nozzles rotate around a nozzle axis by rotation of the rotary motor,
The drive shaft is provided with upper and lower two-stage drive pulleys, and the driven pulleys of the nozzles are alternately arranged in the upper and lower directions in the row direction of the nozzles so as to correspond to the upper and lower two-stage drive pulleys, respectively. An endless belt is wound around the pulley and two corresponding driven pulleys, and the drive shaft includes a nozzle at one end and a nozzle at the other end constituting a row of nozzles rotated by the upper and lower drive pulleys. And a stationary idler pulley and a movable idler pulley that are in contact with the drive pulley and the two driven pulleys only on the inside of each endless belt, and that are in contact with the outside of each endless belt. Without
The upper and lower two-stage driving pulleys each rotate two nozzles, and each endless belt has the upper and lower two-stage driving pulleys and the driven nozzles of the two nozzles as vertices, and all the inner angles are 90 °. It is stretched around only the drive pulley and the driven pulley so as to have the following triangular shape,
Furthermore, an electronic component mounting apparatus characterized in that the position of the drive shaft can be adjusted.

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