JP5952129B2 - Component transport head, component suction nozzle and component mounting device - Google Patents

Description

  The present invention relates to a component transport head mounted on a component mounting apparatus or the like, and a component suction nozzle used in the component transport head.

  Conventionally, it has been equipped with a component transfer head that can move between a printed wiring board or other substrate positioned at a predetermined work position and the component supply unit, and this head picks up the component from the component supply unit and mounts it on the substrate. A component mounting apparatus is known. In this type of component mounting apparatus, the head includes a shaft-shaped head body and a component suction nozzle that is detachably attached to the tip (lower end) of the head, and the nozzle is replaced according to the type of component. (For example, Patent Document 1).

  The nozzle is attached to the head body in a state of being fitted or fitted to the lower end of the head body. For example, the nozzle is elastically engaged from the outside in the nozzle radial direction by a leaf spring-like locking piece provided on the head body. What is held by the head main body by being stopped is generally used (for example, Patent Document 2). That is, when replacing the nozzle, the nozzle is inserted into and removed from the head body against the resilience of the locking piece.

JP 2002-246800 A JP 2008-142880 A

  In the conventional head, the fitting size of the nozzle to the head main body is set so that the nozzle can be attached and detached smoothly. Therefore, although the position of the nozzle (particularly the position of the nozzle tip) is positioned to some extent by the elastic force of the locking piece, it cannot be said that it is completely stable and has an irregular inclination with respect to the head body. Occurs.

  However, in recent years when the miniaturization of components has progressed, such irregular nozzle inclinations and the like are becoming ignorable in securing the mounting accuracy of components. As a countermeasure, for example, it is conceivable to increase the positioning accuracy of the nozzle by strengthening the resilience of the locking piece, but in this case, the smooth attaching / detaching operation of the nozzle may be hindered, There is concern about the impact on tact time.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a technique capable of stabilizing the position of a nozzle without hindering the attachment / detachment performance of the nozzle.

In order to solve the above-described problems, the present invention provides a component transport head that sucks and transports a component to a target position, and is detachably mounted on a shaft-shaped head main body and a tip portion of the head main body. A component suction nozzle, and a locking member that locks the nozzle mounted on the tip with respect to the head body, the nozzle including a mounting hole, and the mounting hole The head main body is attached to the head main body by being inserted into the head main body, and the head main body includes a negative pressure passage for supplying a negative pressure for component adsorption to the nozzle, and the negative pressure. A part of the negative pressure for adsorbing the components supplied to the negative pressure passage is opened at a position that branches from the passage and opens to a position of the side surface of the head body that faces the inner side surface of the mounting hole . those comprising a branch passage Ru allowed to act on the side surface, the

  In this component transport head, the component suction is performed by the nozzle by supplying the component suction negative pressure to the nozzle through the negative pressure passage of the head body. At this time, the negative pressure is supplied between the side surface of the head main body and the inner side surface of the nozzle mounting hole through the branch passage, whereby the nozzle is sucked toward the head main body side and positioned. Thereby, the position of the nozzle is stabilized at the time of component adsorption. Further, since the supply of negative pressure is normally stopped when replacing the nozzle, it is possible to easily replace the nozzle without being affected by the negative pressure.

  In this component transport head, the negative pressure passage is formed at the position of the tip of the head body in the negative pressure passage so that the inner diameter of the negative pressure passage is smaller on the downstream side than on the upstream side. It is preferable that a throttle portion is provided and the branch passage is branched from the negative pressure passage at a position upstream of the throttle portion in the negative pressure passage.

  According to this configuration, since the negative pressure passage has the throttle portion, the negative pressure value of the branch passage is suppressed from fluctuating depending on the type of nozzle (the size of the nozzle diameter). Therefore, it is possible to stably position the nozzle regardless of the type of nozzle (nozzle diameter).

  In the component transport head, the pair of elastic locking pieces are provided on the head main body, and elastically sandwich the nozzle mounted on the tip from both sides in the radial direction. When it is included, it is preferable that the branch passage opens in a direction different from the direction in which the pair of elastic locking pieces are arranged. For example, it is desirable that the branch passage opens in a direction orthogonal to the direction in which the pair of elastic locking pieces are arranged.

  According to these configurations, the nozzles are positioned in the direction in which the elastic locking pieces are arranged by the elastic force of the pair of elastic locking pieces, and the branch passage is opened by the suction force due to the negative pressure. The nozzle is positioned. Thus, the positioning reliability of the nozzle with respect to the head body is improved by positioning the head in two directions.

  In the component transport head described above, in order to smoothly mount the nozzle to the head main body, it is desirable that a tip portion of the head main body is provided with a tapered portion for leading the nozzle. In this case, it is preferable that the branch passage opens in a vicinity of the tapered portion on a side surface of the head main body and at a position on the rear end side with respect to the tapered portion.

  That is, in order to improve the stability of the nozzle, it is advantageous to draw the position of the front end side from the rear end side (nozzle rear end side) of the mounting hole to the head body. In this regard, according to the above configuration, it is possible to apply a negative pressure to the inner peripheral surface of the nozzle mounting hole at a position near the tip of the head body while avoiding a negative pressure leak due to the tapered portion.

  On the other hand, the component mounting apparatus according to the present invention is a component mounting apparatus that transports and mounts a component supplied by a component supply unit on a substrate, and for component transport that transports the component from the component supply unit onto the substrate. As the head, any one of the above-described component conveyance heads is provided.

  According to this component mounting apparatus, since the position of the nozzle of the component transport head can be stabilized as described above, it is possible to improve the component mounting position accuracy.

The component suction nozzle of the present invention is formed in a shaft shape, and includes a negative pressure passage for supplying a negative pressure for component suction therein, a branch passage branched from the negative pressure passage and opened to a side surface. Is attached to the head main body and is locked to the head main body by a predetermined locking member, so that, together with the head main body and the locking member, the component is sucked from the predetermined component supply unit and the target position is Nozzle that constitutes a component transporting head that includes a mounting hole for the head main body, and is attached to the head main body by inserting the tip of the head main body into the mounting hole. while being formed so as, in this mounted state, can be locked to the head main body by the locking member, and an inner surface of the mounting hole portion so as to face the opening portion of the branch passage Negative pressure Some of the negative pressure for the component suction supplied to the road is being formed to act.

  This component suction nozzle is useful as a nozzle applied to the above-described component transport head, and can be stably positioned with respect to the head body in the above-described component transport head by being applied as the nozzle. Is done.

  As described above, according to the component transport head of the present invention, the nozzle is positioned with respect to the head body using the negative pressure for component suction, so that the nozzle mounting / dismounting performance is not hindered. The position can be stabilized.

1 is a plan view showing a component mounting apparatus according to the present invention (a component mounting apparatus to which a component transport head and a component suction nozzle according to the present invention are applied). It is a front view which shows a component mounting apparatus. It is a front view which shows the component mounting head (component conveying head concerning this invention). It is sectional drawing (IV-IV sectional view taken on the line of FIG. 3) of the component mounting head. FIG. 5 is a cross-sectional view of the component mounting head (a cross-sectional view taken along line VV in FIG. 4). FIG. 6 is a cross-sectional view (a diagram corresponding to FIG. 5) illustrating the component mounting head in a state where the nozzle is removed from the head body. It is a figure (graph) which shows the relationship between a nozzle gap (gap between a head main body and a nozzle) and the amount of intake air. It is a figure (graph) which shows a time-dependent pressure change in a negative pressure passage at the time of negative pressure release.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  1 and 2 schematically show a component mounting apparatus M (a component mounting apparatus to which a component conveying head and a component suction nozzle according to the present invention are applied) according to the present invention, and FIG. 1 is a plan view. FIG. 2 is a front view schematically showing the component mounting apparatus M, respectively. In FIG. 1 and FIG. 2, XYZ rectangular coordinate axes are shown in order to clarify the directional relationship between the drawings.

  The component mounting apparatus M includes a base 1, a substrate transport mechanism 2 that is disposed on the base 1 and transports a substrate 3 such as a printed wiring board (PWB) in the X direction, and a component supply unit 4. 5, a component mounting head unit 6, a head unit driving mechanism for driving the head unit 6, an imaging unit 7 for component recognition, and the like.

  The substrate transport mechanism 2 includes a pair of conveyors 2 a and 2 a that transport the substrate 3 on the base 1. These conveyors 2a and 2a receive the board 3 from the right side of the figure, convey it to a predetermined mounting work position (position shown in the figure), and hold the board 3 by a holding device (not shown). Then, after the mounting operation, the substrate 3 is unloaded to the left side of the figure.

  The component supply units 4 and 5 are disposed on both sides (both sides in the Y direction) of the substrate transport mechanism 2. A plurality of tape feeders 4 a arranged in the X direction along the substrate transport mechanism 2 are disposed in one of the component supply units 4 and 5. These tape feeders 4a are provided with reels around which small chip components such as ICs, transistors, capacitors, etc. are stored and wound. The tape feeders 4a are provided in the vicinity of the substrate transport mechanism 2 while intermittently delivering the tapes from the reels. A part is supplied to a predetermined part supply position. On the other hand, trays 5a and 5b are set in the component supply unit 5 on the other side at a predetermined interval in the X direction. On each tray 5a, 5b, package type parts such as QFP (Quad Flat Package) and BGA (Ball Grid Array) are arranged and placed so that they can be taken out by the head unit 6 described later. ing.

  The head unit 6 takes out components from the component supply units 4 and 5 and mounts them on the substrate 3, and is disposed above the substrate transport mechanism 2 and the component supply units 4 and 5.

  The head unit 6 is movable in the X direction and the Y direction within a certain area by the head unit driving mechanism. This head unit driving mechanism is fixed to a pair of elevated frames provided on the base 1 and extends in the X direction by being supported by these fixed rails 8 and a pair of fixed rails 8 extending in parallel to each other in the Y direction. A support member 11 and a ball screw shaft 9 screwed into the unit support member 11 and driven by a Y-axis servo motor 10 are included. Also, a fixed rail 13 fixed to the unit support member 11 and supporting the head unit 6 so as to be movable in the X direction, and a ball screw that is screwed into the head unit 6 and driven using the X-axis servo motor 15 as a drive source. Shaft 14. That is, the head unit driving mechanism moves the head unit 6 in the X direction via the ball screw shaft 14 by driving the X axis servo motor 15 and also moves the unit via the ball screw shaft 9 by driving the Y axis servo motor 10. The support member 11 is moved in the Y direction, and as a result, the head unit 6 is moved in the X direction and the Y direction within a certain region.

  The head unit 6 includes a plurality of (in this example, six) shaft-shaped heads 16 for mounting components, and the heads 16 are moved up and down (moved in the Z direction) with respect to the head unit 6 and rotated around an axis. And a head driving mechanism using a servo motor as a driving source for rotating (rotating in the R direction in FIG. 2). 3 is mounted on a predetermined position on the substrate 3. In the present embodiment, each of the heads 16 corresponds to a component conveying head of the present invention.

  As will be described in detail later, each head 16 includes a nozzle 40 for sucking components at the tip. These nozzles 40 can communicate with any one of a negative pressure generator, a positive pressure generator, and the atmosphere via an electric switching valve. That is, by supplying a negative pressure to the nozzle 40, the component can be sucked and held by the nozzle 40, and thereafter, when the positive pressure is supplied to the nozzle 40, the sucking and holding of the component is released. It is like that.

  The image pickup unit 7 picks up images of components taken out from the component supply units 4 and 5 prior to mounting in order to recognize an image of the holding state of the components by the heads 16. Are disposed at a position between the trays 5a and 5b.

  In the component mounting apparatus M described above, the head unit 6 moves onto the component supply units 4 and 5, and the components are sucked and held by each head 16. After the components are picked up, the head unit 6 passes over the imaging unit 7, specifically, the head unit 6 passes once over the imaging unit 7 in the X direction, so that the components held by each head 16 are imaged. The pickup state of the components captured by the unit 7 and held by each head 16 is recognized based on the image. If any of the components held by each head 16 is defective or cannot be corrected, the head unit 6 is placed on the substrate 3 after the component is registered as a disposal target. The components other than the object to be discarded are sequentially mounted on the substrate 3. At this time, the position of the head unit 6 and the rotation angle of the head 16 are controlled in accordance with the component recognition result, so that the component is appropriately mounted on each mounting point on the substrate 3.

  When components are mounted on the substrate 3 in this way, the head unit 6 moves onto a component disposal box (not shown) and discards the components to be discarded. As a result, one cycle of the mounting operation is completed, and the necessary components are mounted on the substrate 3 by repeating this operation as necessary.

  The nozzles 40 of each head 16 can be exchanged, and can be exchanged with other nozzles 40 having different shapes and sizes as necessary. In the nozzle replacement, before one cycle of the mounting operation is completed and the next cycle is started, for example, the head unit 6 is disposed on a nozzle replacement device (not shown) installed on the base 1 and The nozzle 40 is inserted into and removed from the head main body 20 as the head 16 is moved up and down.

  Next, the details of the configuration of the head 16 for mounting components will be described.

  3, 4, and 5 show the tip portion of the head 16, FIG. 3 is a front view, and FIGS. 4 and 5 show the head 16 in longitudinal sectional views.

  As shown in these drawings, the head 16 includes a head body 20 that is driven up and down and rotated with respect to the head unit 6, and a component suction unit that is detachably attached to the tip (lower end) of the head body 20. Nozzle 40 and a pair of locking pieces 32 (corresponding to the locking member of the present invention) for releasably locking the nozzle 40 with respect to the head body 20.

  The head main body 20 includes a cylindrical shaft member 21 and a holder member 22 fixed to the tip end portion (the lower end portion in FIG. 3 and the like) of the shaft member 21.

  The holder member 22 holds the nozzle 40. The holder member 22 includes a fitting portion 24 having a fitting recess 24a that opens upward, and a cylindrical shaft portion 25 that is connected to the lower side of the fitting portion 24 and extends downward and penetrates in the vertical direction. I have. As shown in FIGS. 3 to 5, the holder member 22 is externally fitted to the shaft member 21 in a state where the shaft member 21 is inserted into the fitting recess 24 a, and the shaft member 21 is bolted 30 in this state. It is fixed to the tip of the.

The interior of the shaft portion 25 of the holder member 22 (referred to internal passage 26), wherein the inner shaft member 21 (referred to internal passage 23) communicates with the axial direction, these internal passage 23, 26, the nozzle 40 On the other hand, a negative pressure passage for supplying a negative pressure or the like for component suction is formed.

  The shaft portion 25 has a branch passage 27 that branches from the internal passage 26 at a right angle and opens to a position facing the inner side surface of the mounting hole portion 41a of the nozzle 40 among the side surfaces of the shaft portion 25. Is formed. As will be described in detail later, the branch passage 27 is configured to position the nozzle 40 by causing a part of the negative pressure for component suction supplied to the internal passage 26 (negative pressure passage) to act on the nozzle 40. belongs to.

  The internal passage 26 of the shaft portion 25 has a passage diameter that is smaller at the position of the tip portion of the shaft portion 25 in the internal passage 26 on the downstream side than the upstream side (lower side from the upper side in the figure). The branch passage 27 is branched from the internal passage 26 at a position immediately above the throttle portion 26a.

  The nozzle 40 includes a nozzle main body portion 41 that is a portion to be attached to the head main body 20 and a component suction portion 42 at the tip that is a portion that sucks components.

  In the nozzle body 41, a mounting hole 41a for receiving the shaft part 25 of the head body 20 (holder member 22) and a holding hole 41b for holding the component suction part 42 are vertically connected. It has a cylindrical shape.

  The component suction portion 42 has a substantially cylindrical shape with an internal passage 44 that penetrates in the vertical direction. The component suction portion 42 is inserted into the holding hole 41b of the nozzle main body 41 and is allowed to be displaced in the axial direction with respect to the nozzle main body 41, while rotating with respect to the nozzle main body 41 (rotation around the axis). Are connected to the nozzle body 41 by a spline. Specifically, a guide groove 42 extending in the axial direction is formed on the outer peripheral surface of the component suction portion 42, and a locking ball 48 fixed to the inner side surface of the holding hole 41 b is interposed in the guide groove 42. By doing so, while the axial displacement within a certain range of the component suction portion 42 with respect to the nozzle body 41 is allowed, the rotation (rotation about the axis) of the component suction portion 42 with respect to the nozzle body 41 is regulated. It has become.

The nozzle main body 41 and the component suction portion 42 are each provided with flanges 41d and 42a on the outer periphery, and the compression coil spring 46 is attached to the component suction portion 42 so as to be interposed between the flanges 41d and 42a. It is installed. That is, the component suction portion 42 is biased in a direction away from the nozzle main body 41 (lower side in the figure) by the elastic force of the compression coil spring 46, and the component suction portion 42 is biased against the nozzle main body 41 at the time of component suction. As a result of the elastic displacement of the component suction portion 42, the collision load of the component suction portion 42 against the component is absorbed by the compression coil spring 46.

  As shown in FIGS. 3 and 5, the nozzle 40 is fitted onto the shaft portion 25 by inserting the shaft portion 25 of the head body 20 (holder member 22) into the mounting hole 41 a of the nozzle body portion 41. Has been. In this state, the head body 20 (holder member 22) is detachably held by being locked to the holder member 22 by the pair of locking pieces 32.

More specifically, the pair of locking pieces 32 are formed of strip-shaped (rectangular) leaf springs extending in parallel with each other in the vertical direction, and each has a locking portion 32a bent inward at the tip (lower end). ing. As shown in FIG. 5, these locking pieces 32 are arranged facing each other across the holder member 22, and each of the locking portions 32 a is positioned on a side portion of the shaft portion 25, and is secured by a bolt 34. It is fixed to the fitting part 24. On the other hand, a pair of locked portions 41 c respectively corresponding to the pair of locking pieces 32 is formed at the rear end portion (upper end portion) of the nozzle body portion 41 of the nozzle 40. These locked portions 41c have a cross-sectional mountain shape that bulges outward from each other across the mounting hole 41a . That is, as shown in FIG. 6, when the nozzle 40 is mounted on the head body 20 (holder member 22) while the shaft portion 25 is received in the mounting hole 41 a, Along each of the locking pieces 32, the outer side is bent outward and deformed. When the nozzle 40 is completely attached to the head main body 20 (shaft portion 25), as shown in FIG. 5, each locking piece 32 is elastically restored, and the locking portions 32a are respectively connected to the locked portions 41c. On the other hand, the nozzle 40 is engaged from the tip end side (lower side), whereby the nozzle 40 is held by the head main body 20 (holder member 22) in a state of being sandwiched from both sides by the respective locking pieces 32. On the other hand, when a pulling force (downward force) larger than the elastic force of the locking piece 32 is applied to the nozzle 40, the locking state of the nozzle 40 by each locking piece 32 is released, thereby causing the nozzle 40 to move. It is separated from the head body 20.

  Here, to supplement the configuration of the holder member 22 of the head body 20, the branch passage 27 of the holder member 22 has a direction different from the arrangement direction of the pair of locking pieces 32, specifically, FIG. And as shown in FIG. 5, it opens toward the direction orthogonal to the row direction of each locking piece 32. As shown in FIG. Further, a tapered portion 28 for leading the nozzle is formed at the distal end portion (the distal end portion of the shaft portion 25) of the head body 20, and the branch passage 27 is near the distal end of the shaft portion 25 and the tapered portion. It branches off from the internal passage 26 at a position above 28.

  Next, the function and effect of the component mounting head 16 will be described.

  In the head 16, when the components are sucked from the component supply units 4 and 5, the negative pressure generated by the negative pressure generating device passes through the negative pressure passages (internal passages 23 and 26) of the head body 20 and the nozzle 40 (component suction portion 42). ), And by this, the components are picked up by the head 16. At this time, a part of the negative pressure introduced into the negative pressure passage passes through the branch passage 27 and the outer peripheral surface of the head body 20 (the outer peripheral surface of the shaft portion 25) and the inner peripheral surface of the nozzle 40 (inside the mounting hole 41a). The nozzle 40 is sucked toward the head body 20 side (right side in FIG. 4). As the nozzle 40 is sucked toward the head main body 20 in this way, the nozzle 40 is positioned in a direction orthogonal to the axial direction of the head 16. Specifically, the nozzle 40 is sandwiched from both sides by the pair of locking pieces 32 as described above, and the branch passage 27 opens in a direction perpendicular to the direction in which the locking pieces 32 are arranged. . Therefore, the nozzle 40 is positioned with respect to the head body 20 in the direction in which the locking pieces 32 are arranged by the elastic force of the pair of locking pieces 32, and the locking pieces 32 are arranged by the suction force of negative pressure. Positioned in a direction perpendicular to the direction.

  According to such a configuration of the head 16, the position of the nozzle 40 is stabilized by positioning the nozzle 40 with respect to the head main body 20 as described above at least during component adsorption. Therefore, although the nozzle 40 is detachable from the head body 20, it is possible to proceed with the component mounting operation in a state where the position of the nozzle 40 is highly stabilized. As a result, the component mounting apparatus M This increases the mounting accuracy of the components. In addition, since the supply of negative pressure is normally stopped at the time of nozzle replacement, the nozzle replacement work in the nozzle replacement device can be easily replaced without being affected by the negative pressure. .

  In the head 16, the negative pressure passage (internal passage 26) of the head main body 20 has a throttle portion 26 a at the tip of the head main body 20 (shaft portion 25) in the negative pressure passage. The branch passage 27 branches from the negative pressure passage (internal passage 26) at a position immediately above the throttle portion 26a. According to such a configuration, the presence of the throttle portion 26a makes it difficult for the negative pressure value at the position upstream of the throttle portion 26a to fluctuate, so that the negative pressure value of the branch passage 27, that is, the nozzle 40 can be reduced. Fluctuation of the suction force depending on the type of nozzle 40 (the size of the nozzle diameter) is suppressed. Therefore, the configuration of the head 16 has an advantage that the nozzle 40 can be positioned stably without being influenced by the type of the nozzle 40 mounted on the head main body 20.

  In addition, according to the configuration of the head 16, the branch passage 27 branches from the internal passage 26 at a position near the tip of the head body 20 (shaft portion 25) and above the taper portion 28. Therefore, a negative pressure can be applied to the mounting hole 41a of the nozzle 40 at a position close to the tip of the head body 20 while avoiding a negative pressure leak due to the tapered portion 28. Thus, according to the configuration in which the nozzle 40 is sucked at a position close to the distal end of the head body 20 (the distal end of the shaft portion 25), compared to the configuration in which the nozzle 40 is sucked at a position close to the proximal end of the shaft portion 25, Phenomena such that the nozzle 40 tilts with respect to the head body 20 (shaft portion 25) with the suction location as a fulcrum are less likely to occur. Therefore, there is an advantage that the nozzle 40 can be positioned with respect to the head body 20 more appropriately.

  In the head 16, in order to appropriately perform the component mounting operation while achieving the above-described effects, the head body 20 (shaft portion 25) and the nozzle 40 (nozzle body portion 41) are fitted together. The diameters of the branch passage 27 and the narrowed portion 26a are required to be appropriate, but the applicant mainly has a size of 0402 (0.4 mm × 0.2 mm) to 3216 (3.2 mm × 1.6 mm). The following experimental results have been obtained for the size nozzle 40.

  First, regarding the fitting between the head body 20 (shaft portion 25) and the nozzle 40 (nozzle body portion 41), the gap (mounting hole portion 41a) between the shaft portion 25 and the nozzle body portion 41 (mounting hole portion 41a). The fitting dimension of the shaft portion 25 and the nozzle body portion 41 (mounting hole portion 41a) is set so that the inner diameter of the shaft portion-the outer diameter of the shaft portion 25 falls within the range of 0.002 mm or more and 0.1 mm or less. It is preferred that This is because if the gap is less than 0.002 mm, troubles in nozzle replacement work are likely to occur. Further, as shown in FIG. 7, the amount of intake air from the branch passage 27 increases as the gap increases, so that when the gap exceeds 0.1 mm, it is difficult to maintain a predetermined component suction force. It is to become. Further, although not mentioned in the above description, in this component mounting apparatus M, the air flow rate in the head body 20 (negative pressure passage) is detected by a flow sensor (or air pressure is a pressure sensor) to detect the tip of the nozzle. When the presence or absence of a component is determined and the clearance exceeds 0.1 mm, the amount of intake air from the branch passage 27 increases, and the air flow rate changes when the component is adsorbed and when the component is not adsorbed in the negative pressure passage ( This is because a change in air pressure is less likely to occur, hindering determination of the presence / absence of components, and hindering appropriate component suction and transport operations.

  Next, the diameter (D1) of the branch passage 27 is preferably in the range of 0.2 mm or more and 1.0 mm or less. This is because, when the diameter (D1) of the branch passage 27 is less than 0.2 mm, the positioning performance of the nozzle 40 is hindered due to insufficient suction force of the nozzle body 41, and conversely, when the diameter exceeds 1.0 mm. This is because the amount of intake air from the branch passage 27 increases, and inconveniences such as insufficient component adsorption force occur as described above.

  The diameter (D2) of the narrowed portion 26a is preferably in the range of 0.2 mm or more and 1.0 mm or less. This is because when the diameter (D2) of the narrowed portion 26a is less than 0.2 mm, a response delay at the time of negative pressure destruction becomes remarkable, which causes a mounting failure. In other words, as described above, when a component is mounted on the substrate 3, the suction state of the component is released by supplying a positive pressure to the nozzle 40 (negative pressure passage). The change depends on the size of the diameter (D2) of the throttle portion 26a. For example, FIG. 8 shows the result of measuring the pressure change over time in the negative pressure passage when the diameter (D2) of the throttle portion 26a is 0.3 mm and 0.4 mm, but the diameter (D2) is small. It can be considered that the direction (0.3 mm) has a slow increase in pressure (negative pressure breakdown) and a response delay is likely to occur. When the diameter (D2) of the narrowed portion 26a is less than 0.2 mm, the response delay of the negative pressure breakdown becomes remarkable, and the release timing of the component suction state is delayed, so that mounting failure is likely to occur. On the other hand, if it exceeds 1.0 mm, the negative pressure value on the upstream side of the throttle part 26a is easily affected by the type of nozzle 40 (the size of the nozzle diameter), and the function of the throttle part 26a is fully exhibited. It will not be done.

  The component mounting apparatus M described above is an example of a preferred embodiment of the component mounting apparatus according to the present invention (the component mounting apparatus to which the component actual transport head according to the present invention is applied). The specific configuration of the head 16 applied thereto can be changed as appropriate without departing from the gist of the present invention.

  For example, in the above embodiment, the nozzle 40 is held by the head body 20 while being sandwiched from both sides by the pair of locking pieces 32, but is configured to be locked from one side by one locking piece. Also good. In short, various configurations can be applied to the specific configuration of the locking member of the present invention as long as the nozzle 40 mounted on the head main body 20 can be detachably locked to the head main body 20.

  Moreover, although the said embodiment demonstrated the example which applied the component conveyance head concerning this invention to the component mounting apparatus, the component conveyance head concerning this invention is applicable also to apparatuses other than a component mounting apparatus. For example, in a so-called component inspection apparatus that picks up a component from a component supply tray (component supply unit) arranged at a predetermined position and conveys the component onto a test apparatus to perform various electrical inspections of the component. Applicable.

M Component mounting device 3 Substrate 4, 5 Component supply unit 6 Head unit 16 Head 20 Head body 21 Shaft member 22 Holder member 32 Locking piece 40 Nozzle 41 Nozzle body unit 42 Component adsorption unit

Claims (7)

A component transport head that sucks and transports a component to a target position,
An axial head body, a component suction nozzle that is detachably mounted on the tip of the head body, and a locking member that locks the nozzle mounted on the tip with respect to the head body. With
The nozzle includes a mounting hole, and is attached to the head main body by inserting the tip of the head main body into the mounting hole.
The head main body includes a negative pressure passage for supplying a negative pressure for component suction to the nozzle, a branch from the negative pressure passage, and the mounting hole portion of the side surface of the head main body. And a branch passage that opens to a position facing the inner side surface and causes a part of the component suction negative pressure supplied to the negative pressure passage to act on the inner side surface. . The component transport head according to claim 1,
The negative pressure passage has a throttle portion formed at a position of a tip portion of the head body in the negative pressure passage so that an inner diameter of the negative pressure passage is smaller on the downstream side than on the upstream side. ,
The component transport head according to claim 1, wherein the branch passage is branched from the negative pressure passage at a position upstream of the throttle portion in the negative pressure passage. In the component conveyance head according to claim 1 or 2,
Each of the locking members includes a pair of elastic locking pieces that are provided on the head main body and elastically hold the nozzle mounted on the tip from both sides in the radial direction,
The component conveying head, wherein the branch passage opens in a direction different from a direction in which the pair of elastic locking pieces are arranged. In the component conveyance head according to claim 3,
The component conveying head, wherein the branch passage is opened in a direction orthogonal to the direction in which the pair of elastic locking pieces are arranged. In the component conveyance head according to any one of claims 1 to 4,
The head body is provided with a taper portion for guiding the nozzle at the tip thereof,
The component conveying head, wherein the branch passage is opened in a vicinity of the tapered portion on a side surface of the head main body and at a rear end side of the tapered portion. A component mounting apparatus for transporting and mounting a component supplied by a component supply unit on a substrate,
A component mounting apparatus comprising the component transport head according to claim 1 as a component transport head for transporting a component from the component supply unit onto the substrate. Mounted on a head body that is formed in a shaft shape and includes a negative pressure passage for supplying a negative pressure for component adsorption into the shaft and a branch passage that branches from the negative pressure passage and opens to a side surface, A nozzle that constitutes a component transporting head that, together with the head main body and the locking member, adsorbs a component from a predetermined component supply unit and transports it to a target position by being locked to the head main body by the locking member Because
A mounting hole for the head main body is provided, and the tip of the head main body is inserted into the mounting hole to be mounted on the head main body. The negative pressure for component suction that can be locked to the head main body by a member and that is supplied to the negative pressure passage with the inner surface of the mounting hole facing the opening portion of the branch passage A part suction nozzle characterized in that a part of the nozzle is formed to act .

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