JP5276299B2 - Mounting head with built-in shaft type linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting head with built-in shaft type linear motor that accurately guides a shaft in a linear form without any backlash using a direct acting guide unit and reduces a total length in the axial direction by arranging an optical encoder in a support space. <P>SOLUTION: A mounting head 1 comprises a stator having coils 27, 27' that are wound like a ring and are disposed next to a hollow linear form, while being arranged in main bodies 4, 5, and a shaft 2 that is inserted into a hollow part of the coils to be driven into a linear motion. The shaft 2 is fixed by a magnet 20 with its homopolarity confronted with each other in the axial direction. In a space 55 at the opening side of a support 15, an optical linear scale 11 is fixed in the axial direction of the shaft 2, and an optical sensor 10 is fixed to the body 5 of the stator. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a mounting head having a built-in shaft type linear motor that is used by being incorporated in various devices such as a semiconductor manufacturing device and an assembling device.

  2. Description of the Related Art In recent years, mounting heads (mounts) equipped with a shaft-type linear motor have come to be used for reciprocating and mounting equipment, components, etc. by incorporating them into various devices such as semiconductor manufacturing equipment, assembly equipment, and measuring equipment. It was. Along with this, the mounting head is currently required to have various performances such as compactness and high responsiveness.

  Incidentally, as shown in FIG. 14, the ball spline type linear motion guide unit 41 includes a shaft 2 as a spline shaft and a support 15 having a slider function straddling it. The support 15 fixed to an object (not shown) such as a device, member, part, base, or frame does not have a gap with respect to the shaft 2 and slides relative to the shaft 2 without causing play. , It can guide straight lines with high accuracy. The above object can be easily attached to the support 15 by screwing a screw (not shown) into the mounting screw hole 52 and fixing it to the support 15 with reference to the mounting reference surface 50 and the mounting reference side surface 51 of the support 15. A highly functional mounting head is configured. The shaft 2 has a through hole 14 formed in the longitudinal direction, and a pair of raceway grooves 16 formed at positions facing the outer surface. The support 15 is formed with a recess 48 for straddling the shaft 2, a casing 42 in which a return path 49 and a raceway groove 16 </ b> C facing the raceway groove 16 are formed, and a pair of casings 42 fixed to both end faces of the casing 42. It has an end cap 43, an end seal 44 fixed to the end face of the end cap 43, and a ball 45 that rolls on a raceway 53 between the raceway groove 16 and the raceway groove 16C. Further, the support 15 is provided with a grease nipple 47 for supplying a lubricant and a holding band 46 for holding the ball 45.

Conventionally, a multi-axis linear motor and a mounting head using the multi-axis linear motor are known. The mounting head includes a shaft for a drive shaft, is arranged in parallel with the spline shaft coaxially with the shaft for the drive shaft, and a pair of position detection sensor units are arranged further below the bearing. It is long and heavy. The mounting head includes a stator in which permanent magnets or coils are linearly arranged, and a movable part in which coils or permanent magnets that are opposed to the stator are linearly arranged. A multi-axis linear motor having a plurality of shaft-type linear motors that move a movable portion with respect to the multi-axis linear motor, and the multi-axis linear motor suppresses magnetic disturbance between adjacent linear motors between adjacent linear motors. It has. The linear motor also includes a position detection sensor unit that detects the moving position of the drive shaft by detecting the magnetic field strength of the drive permanent magnet provided on the drive shaft constituting the movable part. (For example, refer to Patent Document 1).
JP 2006-180645 A

  However, conventional mounting heads are used by being incorporated in various devices such as semiconductor manufacturing equipment and assembly equipment, and the position sensor for detecting the position of the movable member is an external type, and there is a problem in downsizing. It was. In addition, the conventional mounting head is required to reduce the weight of the movable member and to have high functions such as high responsiveness and high accuracy. Furthermore, the device itself is compact and can be easily incorporated into the device. In the driving of the reciprocating movement of the movable member, the positioning of the devices and parts attracted or held by the movable member is required to be driven at high speed with high response and with high accuracy.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and is configured by using a ball spline type linear motion guide unit developed by the present applicant and having a structure incorporating a shaft type linear motor. First, a support that functions as a bearing is provided with a shaft that is a ball spline shaft without backlash, that is, with no gap, so that it can be linearly reciprocated with high accuracy, and the support is screwed to the mounting surface of the main body. Can be easily arranged, and can provide high performance in the reciprocating movement of the shaft with respect to the support. Second, an optical sensor is provided in a space that can be formed in the region on the opening side of the support. In addition, an optical linear scale is placed in the axial direction of the shaft to shorten the overall length of the device itself in the axial direction, and a movable member consisting of a shaft equipped with a magnet is formed into a lightweight structure. In addition, the entire device should be configured compactly, and thirdly, the assembly structure of the device itself should be simplified and highly reliable, and not only a single shaft structure but also a multi-axis structure. It is to provide a mounting head with a built-in shaft type linear motor.

The present invention includes a stator having a plurality of coils wound in a ring shape and arranged adjacent to a hollow linear shape and disposed in a plurality of main body portions, and inserted into the hollow portions of the coils for linear motion. In a mounting head incorporating a shaft type linear motor having a movable member having a reciprocating shaft,
The shaft has a circular cross section and a pair of raceway grooves formed along the outer surface in the axial direction. The shaft is guided to be slidable relative to the support fixed to the main body via a rolling element, and is disposed on the outer periphery of the shaft. Is arranged with a plurality of magnets facing the same pole along the axial direction,
A concave portion for straddling the shaft is formed in the support, and an optical sensor disposed in the main body and the space formed in the opening-side region facing the concave portion of the support An optical encoder composed of an optical linear scale fixed to the shaft along the axial direction facing the optical sensor;
The present invention relates to a mounting head incorporating a shaft type linear motor, wherein the shaft is slidably positioned with respect to the stator by electromagnetic interaction between a magnetic flux generated by the magnet and a current flowing through the coil.

The front Symbol optical linear scale is mounted via the supporting plate to the shaft, the said shaft side of the support plate, the lubricant from the shaft side does not contaminate flow into the optical linear scale as such, groove along the axis direction are formed on both sides of the support.

  In the mounting head, a through hole functioning as an air suction hole for component suction is formed in the shaft. Therefore, objects such as various workpieces, chips, and assembly parts can be adsorbed to the front end surface of the shaft by suction air so that the objects can be easily and accurately conveyed or positioned.

  In the mounting head, a cylindrical coil yoke that wraps the outer periphery of the coil is disposed in the main body, and the coil yoke is formed in a pair of yoke halves divided in half in the axial direction. , A support flange for fixing the coil substrate is formed on one of the yoke halves so as to protrude to the outer peripheral side. Further, the coil yoke is provided with the coil substrate for concentrated wiring of terminals derived from the individual coils. Each coil is wound around a coil bobbin, and the coil bobbin has a convex portion for positioning with respect to the coil yoke.

  In the mounting head, a nonmagnetic sleeve is interposed between the shaft and the magnet.

  Further, the mounting head has a multi-axis structure in which the four shafts are arranged in a matrix on the frame constituting the main body. Further, the frame is constituted by combining frame halves each having two shafts. Further, a through hole into which a gravity balancing spring extending in the axial direction can be inserted is formed at the center of the combined surface where the frame halves are combined.

  In addition, the mounting head is provided with hooks on the shaft and the main body, and when the shaft is used as a vertical shaft, a spring for equalizing the influence of gravity is disposed between the hooks. be able to.

  Further, in this mounting head, the support is attached to a raceway groove facing the raceway groove of the shaft and a casing formed with a return path parallel to the raceway path between the raceway grooves, and both end faces of the casing. And an end cap formed with a direction change path communicating the track path and the return path, and a plurality of rolling paths configured by the track path, the return path, and the pair of direction change paths. It has the rolling element.

  As described above, the mounting head incorporating the shaft type linear motor according to the present invention is provided with an optical encoder composed of an optical linear scale and an optical sensor by utilizing the space existing on the opening side of the support. In addition, since the linear motor is provided with a magnet that is a permanent magnet on the shaft that constitutes the movable member, the overall length in the axial direction can be reduced, the movable member can be made lighter and more compact, and the moment of inertia of the movable member can be reduced. In addition to realizing high response, that is, high response, the mounting head can be assembled easily and simply, with high accuracy and high reliability.

  The mounting head with a built-in shaft type linear motor according to the present invention can be configured to be short in the axial direction, and is a mounting head with a built-in compact shaft type linear motor. Responding to high speed and response, the shaft slides smoothly with no play, and an optical linear scale is installed to enable high-accuracy positioning. In addition, this mounting head has a simple assembly structure, and is a highly reliable device. Embodiments of a mounting head incorporating a shaft type linear motor according to the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 8, a mounting head (hereinafter referred to as mounting head 1) incorporating a shaft-type linear motor according to the present invention is generally wound in a ring shape and arranged adjacent to a hollow linear shape. The stator having a plurality of coils 27 and 27 'disposed in a plurality of (two in the embodiment) main body portions 4 and 5 and the hollow portions of the coils 27 and 27' are inserted into the stator and driven in a linear motion. A movable member having a shaft 2, and a long shaft 2 having a single-axis cross-sectional circular shape is supported by a support 15 so as to be capable of linearly reciprocating, and is provided between the support 15 and the shaft 2. A shaft type linear motor 30 for positioning control is incorporated in between. That is, in the mounting head 1, in particular, the shaft 2 has a circular cross section and a track groove 16 is formed along the longitudinal direction, and the shaft 2 is transferred to a support 15 fixed to one main body 4 at both ends. A plurality of magnets 20 are fixed to the outer periphery of the shaft 2 by abutting the same poles (that is, the N poles and the S poles) along the axial direction on the outer periphery of the shaft 2. The shaft 2 is slidably positioned and driven with respect to the stator by electromagnetic interaction between the magnetic flux generated by the magnet 20 and the current flowing through the coils 27 and 27 '. The shaft-type linear motor 30 is protected by being covered with a cover body 3 that also has a cover 15 that is fixed to both ends and is rectangular in cross section and also serves as a box-like cover. Both ends of the shaft 2 protrude from the center of the shaft. The cover body 3 is made of a lightweight, non-magnetic aluminum material. As shown in FIG. 3, the cover body 3 has a main body portion 4 having a large frame with an L-shaped cross section, It is composed of two members, a main body portion 5 that has a key shape in cross section, and has a structure that allows the shaft type linear motor 30 to be easily packaged. The shaft 2 is slidably supported by support bodies 15 at both ends, and is configured to be guided by linear reciprocation with respect to the support body 15.

  Since the support body 15 shown in FIGS. 1-6 is comprised similarly to the support body 15 which functions also as a slider which slides relatively with respect to the shaft 2 which is a spline shaft, as shown in FIG. The same symbols are used. The support 15 has a rectangular block shape and is formed with a recess 48 straddling the shaft 2, the back side of the recess 48 is formed on an attachment reference plane 50 (attachment plane), and a side surface orthogonal to the attachment reference plane 50. Is formed on the attachment reference side surface 51. The main body portion 5 is fixed to an attachment surface 26 of a flat two attachment surface of the L-shaped inner L portion formed at the end portion of the main body portion 4. A meat burglar 54 is formed in the main body 5 for weight reduction, and a sensor substrate 17 is disposed in an area corresponding to one of the meat burglars 54.

As shown in FIG. 2, an optical encoder for positioning detection is installed on the opening side that becomes the empty space 55 facing the concave portion 48 of the support 15. The optical encoder includes an optical linear scale 11 and an optical sensor 10, and the optical linear scale 11 passes through the support plate 7 along the axial direction of the shaft 2 on the opening side of the recess 48 of the support 15. The optical sensor 10 is disposed in a space 55 formed in the opening side region of the concave portion 48 of the support 15 with a slight gap 57 facing the optical linear scale 11. The cover body 3 is fixed to the body portion 5 via the sensor substrate 17. Further, concave grooves 18 are formed along the axial direction on both sides of the back surface of the support plate 7 on the shaft 2 side, and a fluid such as a lubricant from the shaft 2 side enters the optical linear scale 11 and becomes contaminated. An escape groove is formed so as not to cause a problem. As described above, the mounting head 1 has the empty space 55 formed in the support 15 and the optical encoder can be disposed at the position of the support 15, so that the overall length of the shaft 2 can be kept small, and the whole is compact. The shaft 2 of the movable member mounted with the magnet 20 is also reduced in weight, and has a structure that is highly responsive, fast slidable, highly accurate, and lightweight with a synergistic effect. Yes. The support plate 7 is made of a lightweight and nonmagnetic aluminum material. As shown in FIG. 1, above end 9 side to the hook 13 of the shaft 2 is fixed, and the hook 12 is fixed to an end portion 8 side of the cover body 3, the mounting head 1 when used in vertical shaft In order to equalize the influence of gravity, a spring (not shown) is disposed between the hook 12 and the hook 13.

  As shown in FIGS. 4 to 8, the assembled shaft-type linear motor 30 can be easily attached by installing it as it is on the body part 4 that is a half of the cover body 3 and screwing the support 15. The coil 27 constituting the armature coil of the shaft type linear motor 30 is fixed to the cover main body 3 on the fixed side, and is fixed to the main body 4 in the drawing. The coil 27 includes a plurality of coils 27 that are cylindrically formed by superposing and arranging one coil 27 wound around the coil bobbin 31 in a ring shape along the longitudinal direction. The coil 27 is configured as a set of three coils 27 that supply current to each phase of the U-phase, V-phase, and W-phase (hereinafter referred to as U, V, and W) in a three-phase energization method. As shown in FIG. 8, eight sets are composed of 24 coils 27. Another set of coils 27 adjacent to the set of coils 27 (U, V, W) is a coil 27 ′ (U ′, V ′, W ′) wound in the reverse direction. Coils 27 ′ are alternately arranged.

  The configuration of the coils 27 and 27 'in the mounting head 1 according to the present invention is configured in a concentrated wiring system from the coils 27 and 27' by the coil substrate 6. For this reason, the exterior of the coils 27 and 27 'is usually provided. 7 and 8, the coil yoke 22 is divided into a yoke half body 23 divided into two and a yoke half body 25 that is oppositely aligned with the yoke half body 23. The yoke half 25 is integrally formed with a support flange 33 that can fix the coil substrate 6 to the mounting surface 34. That is, the coil substrate 6 can be fixedly attached to the attachment surface 34 of the support flange 33 provided in the yoke half 25. The yoke halves 23 and 25 are formed in a steel plate shape made of a magnetic material, and are formed in a bowl shape obtained by dividing a longitudinal cylinder into two in the axial direction. One yoke half 25 has one edge along the axial direction. The support flange 33 having a mounting plane on which the coil substrate 6 can be fixed is provided by projecting from the outer periphery to the outer periphery. In the coil yoke 22, the yoke half 25 and the yoke half 23, which are divided bodies, are fixedly provided with a slight gap 56 in the axial direction, and terminals from the coils 27 and 27 'pass through the gap 56. Wiring to the coil substrate 6 is possible. Each coil 27, 27 'is wound around a coil bobbin 31 made of a synthetic resin, and the coil bobbin 31 is formed with a convex portion 32 that can be positioned in the gap 56, from each coil 27, 27'. The lead-in and lead-out terminals are formed so that they can be easily taken out. Since the mounting head 1 has a concentrated wiring system with the coil substrate 6 on the exterior, the mounting head 1 is configured to be easily wired and highly reliable power wiring.

  As shown in FIG. 5, fixed brackets 24 are provided on both ends of the coils 27 and 27 ′ so that the coils 27 and 27 ′ are in close contact with each other and the divided coil yoke 22 is fixed with a slight gap 56 therebetween. It is installed. The fixing bracket 24 is made of lightweight and nonmagnetic aluminum. FIG. 6 is an explanatory diagram showing the installation state of the magnet 20. The magnet 20 constituting the field magnet of the shaft type linear motor 30 is mounted on the shaft 2 and inserted into the hollow portions of the coils 27 and 27 ′, and the coil 27 is interposed between the coils 27 and 27 ′ and a slight gap 19. , 27 'is fixed to a predetermined position of the shaft 2 at a predetermined position. The shaft 2 is constituted by a support 15 at both ends and a spline shaft constituting the linear motion guide unit 41, and has a circular cross section and a pair of track grooves 16 formed on the outer surface along the axial direction, that is, the longitudinal direction. 15 is configured to be fitted and slidably guided through a rolling element ball 45 (FIG. 14), and is smoothly slidably guided without backlash. Further, a through hole 14 is formed in the shaft 2, and the through hole 14 is configured as a suction air hole for sucking air in order to suck parts such as elements and elements onto the shaft 2.

  A plurality of magnets 20 having a cylindrical shape are fixed to a predetermined portion of the shaft 2 which is a spline shaft via a non-magnetic aluminum cylindrical sleeve 28. By interposing a non-magnetic sleeve 28, the wraparound of the magnetic flux to the shaft 2 of the spline shaft is reduced. The magnet 20 is an arrangement (illustrated) of magnets 20 having one end in the axial direction and an N pole at the other end and an S pole at the other end, with the same poles connected to each other. Yes. Further, the magnets 20 repelling each other in the axial direction are firmly fixed by a sleeve 28 with a flange 21 and a fixed flange 29 at the other end. The magnet 20 is composed of a rare earth neodymium-based permanent magnet.

  Next, a matrix head 1A which is another embodiment in which the mounting head incorporating the shaft type linear motor according to the present invention has a multi-axis structure will be described with reference to FIGS. 9 to 13, the same or similar members as those in the embodiment shown in FIGS. 1 to 8 are denoted by the same reference numerals with the suffix A, and redundant description is omitted. Since the shaft-type linear motor 30 shown in FIGS. 1 to 8 can be configured to be compact and lightweight, the multi-axis shaft-type linear motor 30 shown in FIGS. 9 to 13 is also compact and lightweight. It has become a thing.

  The mounting head in a multi-axis structure, that is, the matrix head 1A has a structure in which the four shafts of the linear motor 30 are arranged in a matrix (vertical and horizontal), and the pitch between the vertical and horizontal shafts 2A is the same. ing. The matrix head 1A has four shaft type linear motors 30 arranged on a frame 35 as a main body and is externally covered with a cover main body 3A. The matrix head 1A generally has a box-like shape with a substantially square cross section and four shafts 2A projecting from both end surfaces so as to be slidable independently of each other. The cover main body 3A is made of a stainless steel plate and has four holes 36 in the figure. The holes 36 are formed at the air inlet and outlet for cooling the shaft type linear motor 30, and the coils 27 and 27 are formed. 'And used as an inlet for wiring to the position encoder. As shown in FIG. 10, four support bodies 15A for guiding the four shafts 2A arranged in a matrix so as to be slidable in the linear direction are disposed in a frame 35 having a rectangular shape so that the opening sides face each other. It is fixed.

As shown in FIGS. 12 and 13, the frame 35 is divided into two half frames 38 and two shaft-shaped linear motors 30 are arranged side by side. The matrix head 1 </ b> A is configured by combining. Therefore, the matrix head 1A can be easily assembled. A sensor support plate 40 is attached to the rear end 8 </ b> A side of the frame half body 38, and the optical sensor 10 </ b> A is supported on the sensor support plate 40. The frame half 38 is made of a non-magnetic and lightweight aluminum material. The cover body 3 </ b> A is configured to be divided so as to cover the outer peripheral portion of the frame half 38. The previously end 9A of the shaft 2A, is fixed hook 13A is an end portion side of the rear of the frame 35 is fixed another hook (not shown), between both the hooks, gravity balancing spring (shown 2). The gravity balancing spring is for equalizing the influence of the gravity of the movable part on the shaft 2A side when the matrix head 1A is used on the vertical axis. The structure is such that the spring of the shaft can be disposed.

  As shown in FIG. 14, the spline shaft constituting the shaft 2A of the shaft-type linear motor 30 has a circular cross section and a track groove 16A formed along the longitudinal direction, and both end portions are slid via balls 45 of rolling elements. It is configured to be fitted to a support 15A that is guided in a freely movable manner. The support 15A has a casing 42 in which a raceway groove 16C is formed so as to face the raceway groove 16A of the shaft 2A, and a return path 49 parallel to the raceway path 53 formed between the raceway grooves 16A and 16C is formed. An end cap 43 formed with a direction change path that connects the track path 53 and the return path 49, and a circulation path that includes the track path 53, the return path 49, and a pair of direction change paths. It has a plurality of balls 45 that roll. The support 15 </ b> A is formed with a recess 48 so as to straddle the spline shaft 2 </ b> A, and the back side of the recess 48 is formed as an attachment reference plane 50, that is, an attachment reference plane, and one side surface orthogonal to the attachment reference plane 50. Is formed on a flat mounting reference side surface 51, and is formed in a rectangular block shape as a whole. A mounting screw hole 52 is provided in the mounting reference plane 50 of the support 15.

  The mounting head incorporating the shaft type linear motor according to the present invention is preferably applied to various devices such as a semiconductor manufacturing device, an assembling device, an inspection device, and a conveying device such as a precision chip.

FIG. 2 is a perspective view showing an embodiment of a mounting head incorporating a shaft-type linear motor according to the present invention and showing a single-axis type mounting head. Is a side view showing the rear end side of the mounting head in Fig. Is a side view showing the tip end side of the mounting head in Fig. It is a perspective view which shows the state which removed a part of cover main body from the mounting head of FIG. It is a perspective view which shows the state which removed a part of coil yoke from the mounting head shown in FIG. It is a perspective view which shows the state which removed the coil structure from the mounting head shown in FIG. It is a perspective view which shows the coil structure in the mounting head shown in FIG. FIG. 8 is a perspective view showing one yoke half in the coil yoke shown in FIG. 7. FIG. 5 is a perspective view showing another embodiment of a mounting head incorporating a shaft-type linear motor according to the present invention, which is a multi-axis type configured using four mounting heads of FIG. 1. Is a side view showing the rear end side of the mounting head in Fig. Is a side view showing the tip end side of the mounting head in Fig. FIG. 10 is a perspective view showing a combined surface side of a biaxial split body with a cover removed from the mounting head of FIG. 9. It is a perspective view which shows the other side of the division body shown in FIG. FIG. 10 is a perspective view showing a linear motion guide unit incorporated in the mounting head of FIGS. 1 and 9.

Explanation of symbols

1 Mounting head 1A Matrix head 2, 2A Shaft (Spline shaft)
3, 3A Cover body 4, 5 Body portion 6, 6A Coil substrate 7, 7A Support plate 10, 10A Optical sensor 11, 11A Optical linear scale 12, 13, 13A Hook 14, 14A Through hole 15, 15A Support body 16 , 16A, 16C Track groove 17, 17A Sensor substrate 18, 18A Concave groove 20, 20A Magnet 21 Flange 22, 22A Coil yoke 23, 23A Yoke half 25, 25A Yoke half 27, 27 'Coil (armature coil)
28 Sleeve 30 Shaft type linear motor 31 Coil bobbin 32, 32A Convex part (coil bobbin)
35 Frame 37 Combined surface 38 Frame half 39 Through-hole 41 Linear motion guide unit 42 Casing 43 End cap 45 Ball (rolling element)
48 Recess 49 Return path 53 Track 55, 55A Space

Claims (12)

A stator having a plurality of coils wound in a ring shape and arranged adjacent to a hollow linear shape and disposed in a plurality of main body portions, and inserted in the hollow portions of the coils and reciprocally driven in a linear motion In a mounting head incorporating a shaft type linear motor having a movable member having a shaft,
The shaft has a circular cross section and a pair of raceway grooves formed along the outer surface in the axial direction. The shaft is guided to be slidable relative to the support fixed to the main body via a rolling element, and is disposed on the outer periphery of the shaft. Is arranged with a plurality of magnets facing the same pole along the axial direction,
A concave portion for straddling the shaft is formed in the support, and an optical sensor disposed in the main body and the space formed in the opening-side region facing the concave portion of the support An optical encoder composed of an optical linear scale fixed to the shaft along the axial direction facing the optical sensor;
A mounting head incorporating a shaft-type linear motor, wherein the shaft is slidably positioned relative to the stator by electromagnetic interaction between a magnetic flux generated by the magnet and a current flowing through the coil. The optical linear scale is attached to the shaft via a support plate, and both sides of the support are disposed on the shaft side of the support plate so that lubricant from the shaft side does not flow into the optical linear scale. mounting head having a built-in shaft type linear motor according to claim 1, characterized in that concave groove along the axis direction is formed. The mounting head incorporating a shaft type linear motor according to claim 1 or 2 , wherein a through hole functioning as an air suction hole for component suction is formed in the shaft. The main body is provided with a cylindrical coil yoke that wraps around the outer periphery of the coil, and the coil yoke is formed into a pair of yoke halves that are divided in half in the axial direction. The mounting head incorporating the shaft type linear motor according to any one of claims 1 to 3 , wherein a support flange for fixing the coil substrate is protruded to the outer peripheral side. 5. The mounting head with a built-in shaft-type linear motor according to claim 4 , wherein the coil yoke is provided with the coil substrate for concentrated wiring of terminals derived from the individual coils. The coil is wound around the coil bobbin in each individual each, shaft type linear according to claim 4 or 5 in the coil bobbin, wherein a convex portion for positioning with respect to the coil yoke is formed respectively Mounting head with built-in motor. The mounting head incorporating the shaft type linear motor according to any one of claims 1 to 6 , wherein a nonmagnetic sleeve is interposed between the shaft and the magnet. The shaft type according to any one of claims 1 to 7 , wherein the frame constituting the main body portion is configured in a multiaxial structure in which the four shafts are arranged in a matrix. Mounting head with built-in linear motor. 9. The mounting head with a built-in shaft type linear motor according to claim 8 , wherein the frame is configured by combining frame halves each having two shafts. The shaft-type linear motor according to claim 9 , wherein a through-hole into which a gravity balancing spring extending in the axial direction can be inserted is formed at a central portion of the combined surface where the frame halves are combined. Mounting head. The hook is provided on each of the shaft and the main body, and a spring for equalizing the influence of gravity is disposed between the hooks when the shaft is used on a vertical axis. A mounting head incorporating the shaft-type linear motor according to any one of 1 to 10 . The support body includes a raceway groove facing the raceway groove of the shaft, a casing formed with a return path parallel to the raceway path between the raceway grooves, attached to both end faces of the casing, and the raceway path and the return path. An end cap formed with a direction change path communicating with the road, and a plurality of the rolling elements that roll on a circulation path composed of the track path, the return path, and a pair of the direction change paths. mounting head having a built-in shaft type linear motor according to any one of claims 1 to 11, characterized in that there.

Images