JP4868221B2 - Component mounting head and component mounting machine - Google Patents

Description

  The present invention relates to a component mounting head and a component mounting machine for mounting a component such as an electronic component on a circuit substrate such as a circuit board.

  In recent years, in the field of electronic component mounting, miniaturization of components and narrowing of the arrangement of components on a circuit board have progressed, and accordingly, the demand for component mounting accuracy with respect to a mounting machine has also increased. In order to ensure the high mounting accuracy, it is preferable that there is no rattling between the nozzle and the nozzle holder that supports the nozzle so that it can be moved up and down in the component mounting head. The position varies and the mounting accuracy deteriorates.

  In particular, in a component mounting head having a structure in which the nozzle is slid with respect to the hole of the nozzle holder that guides the raising and lowering of the nozzle, in order to raise and lower the nozzle smoothly, 10 μm is provided between the nozzle and the hole of the nozzle holder. A gap of a certain degree is essential, and the nozzle rattles against the nozzle holder, which makes it difficult to improve the mounting accuracy.

Therefore, when high mounting accuracy is required, generally, as in a component mounting head described in Patent Document 1 (Japanese Patent Laid-Open No. 2003-174290), the nozzle is moved up and down by a rolling bearing such as a ball spline. The structure is such that it is not necessary to provide a gap between the nozzle holder and the nozzle.
JP 2003-174290 A

  However, when a rolling bearing is used for the part that guides the nozzle, there is no need to provide a gap between the nozzle holder and the nozzle. It is necessary to strictly control the accuracy of the shaft portion, which is technically difficult and very expensive in terms of cost. In addition, not only the nozzle but also a rolling bearing and a portion in which the rolling bearing in the nozzle holder is fitted must be subjected to strict accuracy control.

  The present invention has been made in consideration of such problems, and therefore the object of the present invention is to eliminate the rattling of the nozzle with respect to the nozzle holder even if the accuracy of parts such as the shaft portion of the nozzle and the bearing is not so required. An object is to provide a component mounting head and a component mounting machine.

In order to achieve the above object, the invention according to claim 1 includes a nozzle that is passed through a hole provided in a nozzle holder and supported so as to be movable up and down with respect to the nozzle holder, and a lifting device that lifts and lowers the nozzle. A component mounting head that holds a component by the nozzle and mounts the component held by the nozzle on a circuit substrate by moving the nozzle up and down, and contacts at least a part of an outer peripheral portion of the nozzle. And having an elastic force biasing means for preventing the nozzle from rattling against the nozzle holder by supporting the nozzle movably in the axial direction and biasing an elastic force to the outer periphery of the nozzle. The component mounting head characterized by the above.

By doing so, it is possible to eliminate the rattling of the nozzle with respect to the nozzle holder while supporting the nozzle so as to be movable in the axial direction without making the shaft portion of the nozzle highly accurate.

The invention according to claim 2 is characterized in that the elastic force urging means is a ring-shaped elastic member, and the ring-shaped elastic member is in a state before the ring-shaped elastic member is mounted on the mounting portion of the nozzle holder. The outer diameter dimension of the member is made larger than the inner diameter dimension of the mounting portion, the inner diameter dimension of the ring-shaped elastic member is made smaller than the outer diameter dimension of the nozzle, and the ring-shaped elastic member is mounted on the nozzle holder. in the state of being mounted to the mounting portion, the urging to Rukoto an elastic force to the outer peripheral portion of the nozzle by the ring-shaped elastic member is crushed in contact with the outer peripheral portion of the nozzle and the mounting portion The component mounting head according to claim 1, wherein the component mounting head is a component mounting head.

  If it does in this way, the shakiness of the nozzle with respect to a nozzle holder can be easily eliminated with a simple-shaped member.

According to a third aspect of the present invention, the elastic force biasing means is a ring-shaped elastic member, and the ring-shaped elastic member is in a state where the hole center of the ring-shaped elastic member and the hole center of the nozzle holder are eccentric. 2. The component mounting according to claim 1, wherein a member is mounted on the mounting portion of the nozzle holder, and the ring-shaped elastic member presses the outer peripheral portion of the nozzle against the inner wall of the hole portion of the nozzle holder. Head.

  If it does in this way, the shakiness of the nozzle with respect to a nozzle holder can be eliminated reliably by pressing a nozzle against the inner wall of the hole of a nozzle holder.

  The invention according to claim 4 is characterized in that at least a portion of the elastic force urging means that contacts the outer peripheral portion of the nozzle has a low friction characteristic. Mounting head.

  If it does in this way, even if it makes an elastic-force bias means contact the outer peripheral part of a shaft part, a nozzle can be raised / lowered smoothly.

  The invention according to claim 5 is the component mounting head according to any one of claims 1 to 4, wherein the elastic force urging means is an elastic foam member.

  In this way, not only does the rattling of the nozzle with respect to the nozzle holder be eliminated, but it also has a function of supplying a lubricant to the sliding portion by impregnating the elastic foam member with a lubricant such as grease or oil. it can. Moreover, if it is an elastic foam member, it can be integrally molded using a mold, and the elastic force biasing means can be realized at low cost.

  The invention according to claim 6 is the component mounting head according to any one of claims 1 to 4, wherein the elastic force biasing means is an elastic fiber member.

  In this way, not only the nozzle shakiness with respect to the nozzle holder can be eliminated, but also the lubricant can be supplied to the sliding portion by impregnating the elastic fiber member with a lubricant such as grease or oil. it can. Further, the elastic force urging means can be realized at low cost.

  A seventh aspect of the present invention is a component mounter comprising the component mounting head according to any one of the first to sixth aspects.

  In this way, the rattling of the nozzle relative to the nozzle holder can be eliminated without making the shaft portion of the nozzle highly accurate.

  The first embodiment embodying the best mode for carrying out the present invention will be described below. First, the structure of the component mounting machine 1 is demonstrated based on FIG. The component mounting machine 1 includes a component supply means 2 (for example, a tape feeder) for supplying electronic components, a substrate transport device 4 for transporting a circuit board 3 as a circuit base, a component mounting head 10 and a component mounting head 10 in a horizontal plane. XY moving device 5 for moving in the XY direction, imaging means 6 for imaging the holding state of the electronic component held by the nozzle, control means (not shown) for controlling the driving of these various devices, etc. .

  Next, the configuration of the component mounting head 10 will be described with reference to FIGS. The component mounting head 10 includes a nozzle 12, a nozzle holder 60, a lifting device 20, a turning device 30, a rotation device 40, and the like.

  A rotating shaft 52 is supported on the component mounting head 10 by a support member 54 so as to be rotatable only about the axis, and the rotating shaft 52 is rotated by the turning shaft motor 32. A nozzle holder 60 is fixed to the rotating shaft 52 below the rotating shaft 52 and rotates together with the rotating shaft 52. Eight nozzles 12 are arranged on the circumference of the nozzle holder 60 at an equal pitch, and the nozzles 12 are passed through holes 62 provided in the nozzle holder 60 so as to be movable in the axial direction and rotatable about the axis. It is supported by. These nozzles 12 are moved up and down by the lifting device 20 and rotated by the rotation device 40.

  The lifting device 20 includes a Z-axis motor 22, a ball screw mechanism 24, a pusher 26, and the like, and the pusher 26 is lifted and lowered by the Z-axis motor 22 via the ball screw mechanism 24.

  The rotation device 40 includes a rotation shaft motor 42, a drive gear 44, a large gear 46, and the like. The large gear 46 is supported by the rotation shaft 52 so as to be able to rotate only around the axis. Therefore, the rotation of the rotation shaft motor is transmitted to the small gear 48 fixed to the upper portion of the nozzle 12 via the drive gear 44 and the large gear 46, and as a result, the nozzle 12 is rotated by the rotation device 40. .

  The nozzle 12 is supported by the nozzle holder 60 as described above, and is urged to the rising end by the spring 18. The nozzle 12 communicates with a vacuum generator (not shown) via a valve device (not shown). By switching the valve device, the component holding unit 16 can perform component suction or suction release by negative pressure. In addition, the nozzle 12 has the shaft portion 14 of the nozzle 12 passed through the hole portion 62 of the nozzle holder 60 with a gap from the inner wall 64 of the hole portion 62, but a presser serving as an elastic force urging means provided in the nozzle holder 60. The member 70 prevents the nozzle 12 from rattling against the nozzle holder 60.

  The holding member 70 is an elastic foam member made of an elastic body made of a foam material such as foamed urethane or rubber sponge, having a ring shape with a rectangular cross section. In addition, it is desirable that the elastic foam member has good sliding properties and low friction characteristics, and the material itself such as fluorine rubber sponge has low friction characteristics or the surface has low friction characteristics due to fluorine coating or the like. It is preferable that at least a portion in contact with the outer peripheral portion of the shaft portion 14 has a low friction characteristic. The pressing member 70 is mounted on the mounting portion 66 of the nozzle holder 60 so that the hole of the pressing member 70 and the hole of the nozzle holder 60 are positioned substantially concentrically above and below each hole 62 of the nozzle holder 60. Yes. In the state before the pressing member 70 is mounted on the nozzle holder 60, the outer diameter of the pressing member 70 is larger than the inner diameter of the mounting portion 66 of the pressing member 70 in the nozzle holder 60, and the inner diameter of the pressing member 70 is the shaft. The outer diameter of the portion 14 is smaller. Therefore, when the pressing member 70 is mounted on the nozzle holder 60, the pressing member 70 is pressed against the mounting portion 66 and the shaft portion 14 by contacting the mounting portion 66 and the outer peripheral portion of the shaft portion 14. An elastic force perpendicular to the longitudinal direction of the shaft portion 14 is urged to prevent the nozzle 12 from rattling against the nozzle holder 60. Further, since the pressing member 70 is a foam material, it can be impregnated with a lubricant such as grease or oil. In this case, the pressing member 70 functions to supply the lubricant to the sliding portion.

  The pressing member 70 may be an elastic fiber member made of a fibrous elastic body such as felt. Since it is a fiber material, it can be impregnated with a lubricant such as grease or oil, like the foam material. Furthermore, the elastic fiber member may have a low friction characteristic with good sliding properties. For example, an elastic body made of a fiber material having a low friction characteristic such as a high molecular polyethylene fiber or a high molecular polyester fiber is desirable.

  Operations of the component mounting head 10 and the component mounter 1 configured as described above will be described. First, the component mounting head 10 is moved to the component holding position on the component supply means 2 by the XY moving device 5. Thereafter, when the pusher 26 is lowered by the lifting / lowering device 20, the nozzle 12 positioned immediately below the pusher 26 receives a pressing force parallel to the lifting / lowering axis direction of the nozzle 12 on the upper portion thereof, and resists the biasing force of the spring 18. Be lowered. When the nozzle 12 is lowered to a height at which the nozzle 12 comes into contact with the component, the valve device is switched and the component is adsorbed to the component holding portion 16 by negative pressure. Thereafter, the pusher 26 is raised by the lifting device 20 and the nozzle 12 is raised to the rising end position. Then, the nozzle holder 60 is rotated by the turning device 30 so that the nozzle 12 adjacent to the nozzle 12 holding the component just before is positioned directly below the pusher 26, and the component is adsorbed in the same manner as described above. After the components are held by all the eight nozzles 12 in this way, the component mounting head 10 is moved onto the imaging means 6 by the XY moving device 5, and the position of the components held by the imaging means 6 is recognized. Is done. Thereafter, the component mounting head 10 is moved to the component mounting position on the circuit board 3 by the XY moving device 5 based on the position recognition result. At that time, the rotation position of the nozzle 12 is positioned by the rotation device 40 so that the rotation position of the component also matches the circuit pattern. The nozzle 12 is lowered to the position where the component contacts the circuit board 3 by the lifting / lowering device 20 in the same manner as when the component is sucked. However, since the thickness dimension of the component differs depending on the type of component, the lowered position of the nozzle 12 is It will vary depending on the thickness dimension. When the component comes into contact with the circuit board 3, the negative pressure is released by switching the valve device, and the component is mounted on the circuit board 3.

  When the component mounting head 10 mounts a component on the circuit board 3, the pusher 26 is raised by the lifting device 20, and the nozzle 12 is raised to the rising end accordingly. Then, after the previous component is mounted, the swiveling device 30 causes the adjacent nozzle 12 to be positioned directly below the pusher 26, and the XY moving device 5 and the rotation device 40 rotate the component mounting head 10 and the component. After the position is determined, the parts are mounted in the same manner as before. After all the components held in the nozzle 12 are mounted in this manner, the above-described component suction operation and mounting operation are repeated to mount the components on the circuit board 3.

  In the present embodiment, since the pressing member 70 is an elastic body and prevents the nozzle 12 from rattling with respect to the nozzle holder 60 by biasing the elastic force against the outer peripheral portion of the nozzle 12, the nozzle Even without making the twelve shaft portions 14 highly accurate, variations in the horizontal position of the nozzle 12 when the nozzle 12 is lowered can be suppressed, and the component mounting accuracy can be made highly accurate. Further, since the pressing member 70 has a low friction characteristic at least at a portion in contact with the outer peripheral portion of the nozzle 12, the nozzle 12 can be moved up and down smoothly without causing a problem of slidability such as stick-slip. I can do it. Furthermore, since the pressing member 70 is made of a foam material or a fiber material, the pressing member 70 can be impregnated with a lubricant such as grease or oil, and the pressing member 70 functions to supply a lubricant to the sliding portion. I can do it. Further, since the pressing member 70 is provided at the upper and lower portions of the nozzle holder 60, even if the pressing force of the pressing member 70 is small, it is possible to effectively prevent rattling, and the pressing member 70 is worn. Even if replacement is necessary, it is easy to replace. In addition, if it is a foam material, it can be integrally molded using a mold, and the pressing member 70 can be manufactured at low cost.

  Next, a second embodiment of the present invention will be described. This embodiment is the same as the first embodiment except that the mounting position of the pressing member 70 with respect to the nozzle holder 60 is different from that of the first embodiment. FIG. 4 is a view of the mounting portion 66 of the pressing member 70 as viewed from above with the nozzle 12 not being passed through the hole portion 62 of the nozzle holder 60. As shown in FIG. And the hole center B of the nozzle holder 60 are held by the nozzle holder 60 so as to be positioned in an eccentric state. The upper pressing member 70 and the lower pressing member 70 are arranged so that their holes are substantially concentric. In a state where the pressing member 70 is mounted on the nozzle holder 60, the dimension L shown in FIG. 4 is smaller than the outer diameter dimension of the shaft portion 14 of the nozzle 12. Therefore, in a state where the nozzle 12 is passed through the hole portion of the pressing member 70 and the hole portion 62 of the nozzle holder 60, a part of the pressing member 70 that is in contact with the outer peripheral portion of the shaft portion 14 of the nozzle 12 is crushed. As a result, the nozzle 12 is pressed against the inner wall 64 of the hole 62 of the nozzle holder 60 by the elastic force of the pressing member 70 generated thereby, and as a result, rattling of the nozzle 12 with respect to the nozzle holder 60 is prevented.

  Next, a third embodiment of the present invention will be described. In the first embodiment, the pressing member 70 serving as an elastic force urging means is a ring-shaped member and surrounds the outer periphery of the shaft portion 14 of the nozzle 12 with an integral member. In the biasing means, a plurality of pressing members surround the outer periphery of the shaft portion 14 of the nozzle 12. However, other parts are the same as those in the first embodiment. In FIG. 5, three pressing members 80 are arranged so as to surround the outer periphery of the shaft portion 14. Then, preferably, as shown in FIG. 5, it is possible to reduce the arrangement pitch between the nozzles 12 by arranging the plurality of pressing members 80 at positions avoiding the adjacent nozzles 12. The mounting head can be made compact. The number of pressing members 80 surrounding the outer periphery of the shaft portion 14 of the nozzle 12 is not limited to three and may be changed as appropriate. Further, as shown in FIG. 6, the nozzle 12 is pressed against the inner wall 64 of the hole 62 of the nozzle holder 60 by the elastic force of the plurality of pressing members 80 surrounding the outer periphery of the shaft portion 14 of the nozzle 12, and as a result, the nozzle with respect to the nozzle holder 60. You may make it prevent 12 rattling.

  The embodiments of the component mounting head and the component mounting machine according to the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and specific shapes, structures, and the like can be appropriately changed. . For example, in the first and second embodiments, the shape of the pressing member 70 may be such that the hole portion is not circular but a plurality of convex portions 72 as shown in FIG. In the first and second embodiments, the pressing member 70 has a rectangular cross section, but may have a cross sectional shape other than a rectangle such as a circle or an ellipse. In the first and second embodiments, the pressing member 70 is ring-shaped, but it may be tubular. In that case, the pressing member 70 can take a long axial contact length with the shaft portion 14 of the nozzle 12. Accordingly, one pressing member 70 may be provided for one nozzle 12.

  Furthermore, in each of the first to third embodiments, the elastic force urging means is constituted only by an elastic member. However, as shown in FIGS. 8A and 8B, the elastic force urging means is It is composed of a main body 90 and a contact portion 92 that comes into contact with the outer peripheral portion of the shaft portion 14 of the nozzle 12. The main body 90 is made of an elastic body, and the contact portion 92 is inelastic with good sliding properties such as fluororesin and polyacetal resin. You may make it consist of bodies. Further, it is desirable that the contact portion 92 has wear resistance. By separating the main body portion and the contact portion in this way, it is possible to select an optimum material for each characteristic such that the main body portion has elastic characteristics and the contact portion has low friction characteristics and wear resistance. The elastic force urging means shown in FIG. 8A includes a ring-shaped or tubular main body 90 and a plurality of contact portions provided on the inner diameter of the main body 90. Thereby, attachment becomes easy compared with the case where a main-body part is divided | segmented into the circumferential direction like FIG.8 (b).

  In the mounting head according to the present invention, it is not necessary that the pressing member 70 and the outer peripheral portion of the shaft portion 14 of the nozzle 12 are in contact with each other over the entire lifting / lowering stroke of the nozzle 12, and at least the nozzle 12 at the time of component mounting. In the lowered position, the pressing member 70 and the outer peripheral portion of the shaft portion 14 of the nozzle 12 may be in contact with each other. Even in this case, it is possible to suppress variations in the horizontal position of the nozzle 12 when the components are mounted.

1 is a schematic plan view of a component mounter according to an embodiment of the present invention. It is a side view which shows the structure of the component mounting head of one Embodiment concerning this invention. It is a side view which shows the structure of the nozzle holder part of the said component mounting head. It is a top view which shows the mounting part of the pressing member in the component mounting head of another embodiment of this invention. It is a top view which shows the mounting part of the pressing member in the component mounting head of further another embodiment of this invention. It is a top view which shows the mounting part of the pressing member in the modification of the said embodiment. It is a top view which shows the modification of a pressing member. It is a top view which shows another modification of a pressing member.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Component mounting machine, 2 ... Component supply means, 3 ... Circuit board, 4 ... Board conveyance apparatus, 5 ... XY movement apparatus, 10 ... Component mounting head, 6 ... Imaging means, 12 ... Nozzle, 14 ... Shaft part, 16 ... Part holding part, 20 ... Elevating device, 60 ... Nozzle holder, 62 ... Hole part, 64 ... Inner wall, 70, 80 ... Pressing member,

Claims (7)

A nozzle that is passed through a hole provided in the nozzle holder and supported so as to be movable up and down with respect to the nozzle holder; and a lifting device that lifts and lowers the nozzle. In the component mounting head for mounting the component held by the nozzle on the circuit substrate by
The nozzle holder is supported against the nozzle holder by contacting at least a part of the outer periphery of the nozzle and supporting the nozzle so as to be movable in the axial direction and urging an elastic force against the outer periphery of the nozzle. A component mounting head comprising elastic force biasing means for preventing sticking.   The elastic force biasing means is a ring-shaped elastic member, and in a state before the ring-shaped elastic member is mounted on the mounting portion of the nozzle holder, the outer diameter of the ring-shaped elastic member is the mounting size. In the state where the inner diameter dimension of the ring-shaped elastic member is made smaller than the outer diameter dimension of the nozzle and the ring-shaped elastic member is mounted on the mounting portion of the nozzle holder. The ring-shaped elastic member urges an elastic force against the outer peripheral portion of the nozzle by being crushed in contact with the mounting portion and the outer peripheral portion of the nozzle. Component mounting head.   The elastic force urging means is a ring-shaped elastic member, and the ring-shaped elastic member is mounted on the nozzle holder in a state where the hole center of the ring-shaped elastic member and the hole center of the nozzle holder are eccentric. The component mounting head according to claim 1, wherein the ring-shaped elastic member presses the outer peripheral portion of the nozzle against the inner wall of the hole portion of the nozzle holder. 4. The component mounting head according to claim 1, wherein at least a portion of the elastic force biasing unit that contacts the outer peripheral portion of the nozzle has a low friction characteristic. 5. The component mounting head according to claim 1, wherein the elastic force urging means is an elastic foam member. The component mounting head according to claim 1, wherein the elastic force urging means is an elastic fiber member. A component mounting machine comprising the component mounting head according to claim 1.

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