JP2016072461A - Component holding head of surface mounting machine, sensor positioning method in component holding head, and sensor positioning jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct misalignment of a sensor for detecting a component holder (a nozzle) to position the sensor in a desired position in a component holding head of a surface mounting machine.SOLUTION: A component holding head of a surface mounting machine includes: a spindle 41; and a lifting member for moving up or down the spindle 41 in a Z direction along an axial direction. A component holder 42 is attached to a lower end of the spindle 41. In the component holding head of the surface mounting machine, a sensor 30 for detecting the component holder 42 is connected with the lifting member through a position adjustment mechanism.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a component holding head having a component holder for holding a component, a sensor positioning method in the component holding head, and sensor positioning in a surface mounter for mounting a component (electronic component) such as an IC chip on a substrate. It relates to a jig.

  In general, a surface mounter moves a component holding head above a component supply unit, and causes a nozzle as a component holder provided in the component holding head to move down and ascend to the lower end of the nozzle. The components are sucked up and picked up, and then the component holding head is moved to the upper side of the board, and then the nozzle is lowered and raised again to mount the parts at predetermined coordinate positions on the board. ing.

  As described above, when picking up a component by causing the nozzle to move down and up, if the lowering stroke of the nozzle is too large, the lower end of the nozzle strongly presses the upper surface of the component and destroys the component. If the descending stroke is too small, the nozzle cannot land on the top surface of the part and picks up the part. The same applies to the case where the component is mounted on the substrate. If the lowering stroke of the nozzle is too large, the component adsorbed on the lower end of the nozzle is strongly pressed against the substrate and destroyed. If the descending stroke is too small, the component cannot land on the top surface of the board, and the component is mismounted. Therefore, the lowering stroke of the nozzle must be properly controlled.

  As a method for appropriately controlling the descending stroke of the nozzle, Patent Document 1 proposes a method using a detecting means (sensor for detecting the nozzle) that detects the landing of the nozzle. However, in the method of Patent Document 1, it is necessary to install a sensor for each nozzle. That is, in a component holding head having a plurality of nozzles, it is necessary to install a plurality of sensors corresponding to each nozzle, which causes a problem in installation space and causes a cost increase.

  On the other hand, the applicant of the present application has, in Japanese Patent Application No. 2013-212220, provided with a spindle on which a nozzle is mounted and an elevating member (pressing tool) for elevating the nozzle as separate members, and a sensor on the elevating member side A component holding head was proposed. According to this component holding head, it is not necessary to install a plurality of sensors corresponding to each nozzle.

  However, when the lifting member is provided with a sensor, the lifting member may be displaced when the lifting member is assembled to the main frame of the component holding head, particularly when adjustment for suppressing the friction of the lifting shaft is performed. . If the position of the elevating member is shifted, the position of the sensor is also shifted in conjunction with this, so that the nozzle (change in the position of the nozzle) may not be detected accurately depending on the sensor.

Japanese Patent No. 3543044

  The problem to be solved by the present invention is to make it possible to correct a positional deviation of a sensor for detecting a component holder (nozzle) in a component holding head of a surface mounter, and to thereby position the sensor at a desired position. There is in doing so.

  According to the present invention, there are provided a component holding head of a surface mounting machine described in the following (1) to (9), a method for positioning a sensor in the component holding head, and a sensor positioning jig.

(1) In a component holding head of a surface mounter comprising a spindle and an elevating member for elevating the spindle in the Z direction along the axial direction, and having a component holder mounted on the lower end of the spindle,
A component holding head of a surface mounter, wherein a sensor for detecting the component holder is connected to the elevating member via a position adjusting mechanism.

(2) The component holding head of the surface mounter according to (1), wherein the sensor is an optical fiber sensor, and the optical fiber sensor includes an optical axis direction adjusting unit for adjusting the optical axis direction.

(3) The component of the surface mounter according to (1) or (2), wherein the position adjustment mechanism includes an XY direction position adjustment member for adjusting a position of the sensor in the XY direction perpendicular to the Z direction. Holding head.

(4) The component holding head of the surface mounter according to (1) or (2), wherein the position adjustment mechanism includes a Z direction position adjustment member for adjusting a position of the sensor in the Z direction.

(5) An XY direction position adjusting member for adjusting the position of the sensor in the XY direction perpendicular to the Z direction, and a Z direction position adjustment for adjusting the position of the sensor in the Z direction. The component holding head of the surface mounter according to (1) or (2), including a member.

(6) The surface according to (5), wherein an arm member is coupled to the elevating member via the XY direction position adjusting member, and the sensor is coupled to the arm member via the Z direction position adjusting member. Mounting machine component holding head.

(7) In the component holding head of the surface mounting machine described in (6), the arm member is positioned in the X and Y directions by a positioning jig attached to the main frame of the component holding head. Sensor positioning method in a component holding head of a machine.

(8) A sensor positioning jig used in a component holding head of a surface mounter according to any one of (1) to (6), wherein the sensor is an optical fiber sensor. A positioning portion for positioning with respect to the main frame of the component holding head, a position fixing portion for fixing the position of the spindle, and a target position portion indicating a target position of the optical axis of the optical fiber sensor. Sensor positioning jig having.

(9) A sensor positioning method using the sensor positioning jig according to (8), wherein the positioning unit is positioned on the main frame, and the position fixing unit fixes the position of the spindle. A method of positioning a sensor in a component holding head of a surface mounter, wherein the position of the optical fiber sensor is adjusted by the position adjusting mechanism so that an optical axis of the optical fiber sensor is aligned with the target position portion .

  In the present invention, the sensor for detecting the component holder is connected to the elevating member via the position adjustment mechanism, so even if a position deviation occurs in the elevating member, the position adjustment mechanism can correct the position deviation of the sensor. As a result, the sensor can be positioned at a desired position.

  Further, by using the positioning jig described in (7) or the sensor positioning jig described in (8), the sensor can be easily and accurately positioned. It can also be performed outside.

It is a perspective view which shows the whole structure of the components holding head of this invention. 2A and 2B are diagrams showing a mechanism for lowering a spindle in the Z direction in the component holding head of FIG. 1, wherein FIG. 1A is a front view, FIG. 1B is a left side view, and FIGS. . It is explanatory drawing which shows the structure around a raising / lowering member in the mechanism which descend | falls the spindle of FIG. 2 to a Z direction. It is a perspective view which shows the principal part of the optical fiber sensor used in the component holding head of FIG. 1 including the attachment state. FIG. 2 is an enlarged perspective view showing a section of a nozzle portion mounted on a lower end of a spindle in the component holding head of FIG. 1. It is a figure which shows typically the change of the light reception amount of an optical fiber sensor when a nozzle lands. It is a figure which shows the use condition of a positioning jig, (a) The back surface of a component holding head, (b) shows the left side surface. It is a figure which shows the attachment state of the optical fiber sensor 30, (a) shows the back surface of a component holding head, (b) shows the left side surface. It is a perspective view which shows a sensor positioning jig. It is a figure which shows the use condition of the sensor positioning jig | tool of FIG. 9, (a) shows the left side surface of a component holding head, (b) shows the bottom face.

  Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings.

  FIG. 1 is a perspective view showing the overall configuration of the component holding head of the present invention.

  A component holding head 10 shown in the figure is a rotary head type component holding head, and a rotary head 40 is attached to a main frame 20 constituting a head body so as to be rotatable in an R direction around a vertical axis. A plurality of spindles 41 are arranged at equal intervals along the circumferential direction of the rotary head 40, and a nozzle 42 is attached to the lower end of each spindle 41 as a component holder that holds components by suction.

  The rotary head 40 rotates in the R direction by driving an R servo motor 21 installed on the main frame 20. Further, each spindle 41 rotates in the T direction around its axis by driving a T servo motor 22 installed in the main frame 20. Further, the main frame 20 is provided with a Z servo motor 23 for lowering the spindle 41a (see FIG. 3) at a specific position in the Z direction along the axial direction. Since a mechanism for rotating the rotary head 40 in the R direction by driving the R servo motor 21 and a mechanism for rotating the respective spindles 41 in the T direction by driving the T servo motor 22 are well known, description thereof will be omitted. A mechanism for lowering the spindle 41a by driving the Z servo motor 23 will be described below.

  2A and 2B are diagrams showing a mechanism for lowering the spindle 41a in the Z direction in the component holding head 10 of FIG. 1, wherein FIG. 2A is a front view, FIG. 2B is a left side view, and FIG. 2C and FIG. It is a perspective view of a part.

  A motor shaft of the Z servo motor 23 is connected to a screw shaft 24 of a ball screw mechanism, and a nut of the ball screw mechanism is attached to the screw shaft 24, and an elevating member 25 is fastened to the nut. The elevating member 25 is provided with an upper spline shaft 26 for rotation prevention and elevating guide. A pressing tool 25 a is integrally connected to the elevating member 25. Therefore, the drive of the Z servo motor 23 moves the pressing tool 25 a in the Z direction together with the lifting member 25.

  Only one lifting member 25 and pressing tool 25a are provided on the main frame 20 side. When the spindle 41 is lowered, the spindle 41 to be lowered (the spindle 41a at the specific position) is selected by moving the spindle 41 relative to the pressing tool 25a, and the spindle is lowered by lowering the pressing tool 25a. 41a is lowered. In this embodiment, as shown in FIG. 3, the spindle 41 is moved with respect to the pressing tool 25a by rotating the rotary head 40 in the R direction, and the spindle 41a immediately below the pressing tool 25a is lowered. However, the configuration in which the spindle 41a at the specific position is selected and lowered is not limited to this, and the spindle to be lowered by moving the pressing tool may be selected.

  Returning to FIG. 2, the base end of the arm member 28 is connected to the elevating member 25 to which the pressing tool 25 a is connected via an adapter member 27, and the sensor holder member 29 is connected to the distal end side of the arm member 28. An optical fiber sensor 30 is connected. In addition, a lower spline shaft 31 is attached to the distal end side of the arm member 28 in order to guide the raising / lowering of the arm member 28 accompanying the raising / lowering of the raising / lowering member 25. The lower spline shaft 31 is fixed to the main frame 20 via a fixing member 32.

  Here, the adapter member 27 is an XY direction position adjusting member for adjusting the position of the optical fiber sensor 30 in the XY direction. That is, the adapter member 27 is connected to the elevating member 25 so that the position of the adapter member 27 can be adjusted in the XY direction within a horizontal plane perpendicular to the Z direction. Accordingly, the position in the XY direction of the arm member 28 integrated with the adapter member 27 is adjusted, and as a result, the position in the XY direction of the optical fiber sensor 30 connected to the arm member 28 is adjusted.

  The sensor holder member 29 is a Z direction position adjusting member for adjusting the position of the optical fiber sensor 30 in the Z direction. That is, the sensor holder member 29 is connected to the arm member 28 so that the position of the sensor holder member 29 can be adjusted in the Z direction. As a result, the position in the Z direction of the optical fiber sensor 30 integrally connected (held) to the sensor holder member 29 is adjusted.

  As described above, the optical fiber sensor 30 is connected to the elevating member 25 via the adapter member 27, the arm member 28, and the sensor holder member 29, but after the position adjustment by the adapter member 27 and the sensor holder member 29 is performed, It is integrated with the elevating member 25 and the pressing tool 25a. Accordingly, when the pressing tool 25a moves in the Z direction by driving the Z servo motor 23, the optical fiber sensor 30 moves in the Z direction in conjunction with this. That is, the optical fiber sensor 30 moves in the Z direction in synchronization with the movement of the spindle 31a in the Z direction due to the raising and lowering of the pressing tool 25a. The spindle 41 is always urged toward the upper initial position by an elastic body 41b (see FIG. 1) composed of two coil springs.

  The optical fiber sensor 30 includes a light emitting unit and a light receiving unit incorporated together with an optical fiber and a lens, and the configuration itself is well known. FIG. 4 is a perspective view showing the main part of the optical fiber sensor 30 used in the present embodiment including its mounting state. As described above, the optical fiber sensor 30 is connected to the arm member 28 via the sensor holder member 29. The optical fiber sensor 30 of the present embodiment has an eccentric collar 30a as an optical axis direction adjusting means for adjusting the optical axis direction. That is, the eccentric collar 30a is attached to the lens 30b of the optical fiber sensor 30, and the optical axis direction of the optical fiber sensor 30 is adjusted by rotating the eccentric collar 30a with respect to the lens 30b.

  Next, the sensor function of the optical fiber sensor 30 will be described.

  In this embodiment, the optical fiber sensor 30 is disposed obliquely above the nozzle 42 attached to the lower end of the spindle 41 as shown in FIG. And the light emission part of the optical fiber sensor 30 emits light P diagonally downward toward the reflective surface 42a of the outer peripheral upper surface of the nozzle 42 shown enlarged in FIG. The light P is received by the light receiving unit of the optical fiber sensor 30.

  Here, the nozzle 42 is attached to the lower end of the spindle 41 via a coil spring 43 (elastic body) as shown in FIG. Accordingly, when the nozzle 42 at the lower end of the spindle 41 is landed due to the lowering of the spindle 41, the coil spring 43 is compressed, and the vertical position of the nozzle 42 with respect to the spindle 41 changes. Specifically, the nozzle 42 relatively moves toward the lower end side of the spindle 41.

  On the other hand, the light P emitted from the light emitting portion of the optical fiber sensor 30 is focused on the reflecting surface 42a in the initial state where the nozzle 42 is not landed by the lens 30b shown in FIG. Therefore, when the nozzle 42 lands and its vertical position changes, the amount of reflected light reflected by the reflecting surface 42a decreases, and the amount of light received by the light receiving portion of the optical fiber sensor 30 decreases (FIG. 6). reference). In this embodiment, this decrease in the amount of received light is detected by a sensor unit (not shown) of the optical fiber sensor 40. The sensor unit determines that the nozzle 42 has landed when the received light amount has decreased by a predetermined amount, for example, when the amount of light has become equal to or less than the threshold value A shown in FIG. 6, and issues a landing detection signal.

  In this specification, the landing of the nozzle 42 (component holder) means that the lower end of the nozzle 42 is landed on the upper surface of the component in the component pick-up process, and is held on the lower end of the nozzle 42 in the component mounting process. It is a concept that includes both the landing of the finished component on the upper surface of the substrate.

  In the above configuration, the surface mounter having the component holding head 10 picks up and holds the component from the component supply unit by the nozzle 42 attached to the lower end of the spindle 41 and transfers it onto the printed circuit board. Mount in place.

  At the time of picking up and mounting, as described with reference to FIG. 3, the pressing tool 25a presses the upper end surface of the spindle 41a positioned immediately below the pressing tool 25a, and the spindle 41a is lowered in the Z direction. Thereafter, when the nozzle 42 at the tip of the spindle 41a lands, the coil spring 43 is compressed and the vertical position of the nozzle 42 with respect to the spindle 41a changes as described above, and the amount of light received by the light receiving portion of the optical fiber sensor 30 is changed. Decrease. And the sensor part of the optical fiber sensor 30 emits a landing detection signal. This landing detection signal is transmitted to the controller of the surface mounter. When this control unit receives the landing detection signal, it stops the Z servo motor 23 that lowers the pressing tool 25a. Thereby, the downward stroke of the nozzle 42 is appropriately controlled, and the nozzle 42 is accurately landed.

  Next, a method for positioning the optical fiber sensor 30 will be described.

  First, the elevating member 25 shown in FIG. 2 is assembled to the main frame 20 with the upper spline shaft 26 as a reference, and then fastened to the nut of the ball screw mechanism described above. Next, the arm member 28 is connected to the elevating member 25 via the adapter member 27. At this time, the arm member 28 and the adapter member 27 are integrated, and the position of the adapter member 27 can be adjusted in the XY direction with respect to the elevating member 25, so that the position of the arm member 28 in the XY direction can be adjusted.

  Specifically, the position of the arm member 28 in the XY direction is adjusted using a positioning jig 50 as shown in FIG. More specifically, the arm member 28 has a step, and the step portion becomes an attachment portion (attachment surface) 28a for attaching the sensor holder member 29, so that the position of the attachment portion 28a in the XY direction is a desired position. In addition, the position of the arm member 28 in the XY direction is adjusted using the positioning jig 50. 7A shows the rear surface of the component holding head 10, and FIG. 7B shows the left side surface thereof.

  The positioning jig 50 has a fastening portion 51 that is fastened and fixed to the main frame 20 at one end, and a positioning portion (positioning surface) 52 that abuts the mounting portion 28a at the other end. By abutting the mounting portion 28a against the positioning portion 52, the position of the mounting portion 28a in the XY direction is positioned at a desired position. Specifically, the position of the attachment portion 28a in the X direction is positioned by the abutment of the attachment portion 28a and the positioning portion 52 shown in FIG. 7A, and the attachment portion 28a shown in FIG. The position of the mounting portion 28a in the Y direction is determined by the contact between the positioning portion 52 and the positioning portion 52. That is, the positioning jig 50 is positioned by fastening the fastening portion 51 at one end thereof to the main frame 20, regardless of the positional errors of the upper spline shaft 26, the pole screw mechanism, and the lifting member 25 described above. The position in the XY direction of the attachment portion 28a of the arm member 28 can be positioned at a desired position. Then, the proximal end side of the arm member 28 is connected and fixed to the elevating member 25 through the adapter member 27 at the positioned position.

  On the other hand, the lower spline shaft 31 is mounted on the distal end side of the arm member 28 as described with reference to FIG. 2, and the lower spline shaft 31 is fixed to the main frame 20 via the fixing member 32. At this time, the fixing member 32 is fixed to the main frame 20 following the position of the lower spline shaft 31 attached to the arm member 28 whose position in the XY direction is adjusted.

  As described above, since the arm member 28 is connected to the elevating member 25 via the adapter member 27 so as to be positionable in the XY direction, the upper spline shaft 26 and the ball screw mechanism are aligned, the lower spline shaft 31 and the arm. The alignment of the member 28 does not interfere. Therefore, it is possible to achieve both a smooth raising / lowering operation and an accurate position of the arm member 28, that is, an accurate XY position of the optical fiber sensor 30.

  Subsequently, the optical fiber sensor 30 is positioned in the Z direction. Specifically, as shown in FIG. 8, a sensor holder member 29 holding an optical fiber sensor 30 is attached to the attachment portion 28a of the arm member 28 that has been positioned in the X and Y directions as described above, and the optical fiber is attached. The sensor 30 is positioned in the Z direction. 8A shows the back surface of the component holding head 10, and FIG. 8B shows the left side surface thereof.

  As described above, the optical fiber sensor 30 is positioned in all directions of XYZ. In this embodiment, the final adjustment of the optical axis (focal position) of the optical fiber sensor 30 is performed using the sensor positioning jig 60. Do it.

  FIG. 9 is a perspective view showing the sensor positioning jig 60, and FIG. 10 is a view showing a use state thereof. 10A shows the left side surface of the component holding head 10 and FIG. 10B shows the bottom surface thereof.

  The sensor positioning jig 60 has a positioning part 61, a position fixing part 62 and a target position part 63.

  When using the sensor positioning jig 60, first, the positioning unit 61 is abutted against the reference plate 20 b attached to the head mounting plate 20 a constituting the main frame 20, so that the sensor positioning jig 60 is moved to the main frame 20. Position with respect to. Next, the position fixing portion 62 is fitted to the lower end of the spindle 41 to fix the position of the spindle 41 (rotary head 40) in the R direction. As a result, the sensor positioning jig 60 and the spindle 41 (rotary head 40) are positioned with respect to the XYZ directions. In this positioned state, the target position portion 63 is the target of the optical axis (focal position) of the optical fiber sensor 30. Indicates the position.

  The final optical axis of the optical fiber sensor 30 is adjusted so that the optical axis of the optical fiber sensor 30 is aligned with the target position portion 63. The optical axis of the optical fiber sensor 30 can be basically adjusted by adjusting the position in the XYZ directions by the adapter member 27 and the sensor holder member 29 described above. However, the dimensional error of each member and the optical fiber sensor 30 itself. In some cases, the optical axis (focus position) of the optical fiber sensor 30 may deviate from the target position due to manufacturing errors. In this case, the optical axis direction of the optical fiber sensor 30 is finely adjusted by rotating the eccentric collar 30a of the optical fiber sensor 30 described in FIG. 4 with respect to the lens 30b. When the eccentric collar 30a is rotated, the focal position of the optical fiber sensor 30 also moves in the Z direction. This movement in the Z direction adjusts the sensor holder member 29 in the Z direction again with respect to the arm member 28. Can be absorbed.

  Here, in the sensor positioning jig 60 shown in FIG. 9, the three position fixing portions 62 are provided, but at least one may be provided. The head mounting plate 20a described above serves as a mounting surface when the component holding head 10 is mounted on the X axis of the XY gantry of the surface mounter.

  As described above, the sensor positioning jig 60 fixes the position of the rotary head 40 in the R direction, that is, the R axis. By performing the R-axis origin adjustment based on the position of the R-axis fixed using the sensor positioning jig 60 as described above, the target position obtained outside the actual machine by the sensor position adjustment described above is the actual machine. The target position is secured even when calibration is performed separately. Further, at the actual assembly site, the encoder origin position of the R servo motor 21 is matched with the R axis (nozzle index) origin position of the rotary head 40, and the R servo motor 21 side and the rotary head 40 side are fastened by coupling. . Adjustment of the origin position of the nozzle index to be aligned at this time can also be performed using the sensor positioning jig 60, so that an error between the origin adjustment position at the assembly site and the origin position on the actual machine can be suppressed. . Furthermore, since the position of the nozzle 42 to be detected can be secured at the same position inside and outside the actual machine by using the sensor positioning jig 60, the light quantity of the optical fiber sensor 30 can be confirmed and adjusted. It can be performed outside the actual machine.

  In the above embodiment, the optical fiber sensor 30 is used as a sensor for detecting the nozzle 42. However, other non-contact sensors such as a magnetic sensor may be used. The present invention can also be applied to a component holding head other than the rotary head type.

10 Parts holding head 20 Main frame (head body)
20a Head mounting plate 20b Reference plate 21 R servo motor 22 T servo motor 23 Z servo motor 24 Screw shaft of ball screw mechanism 25 Lifting member 25a Pressing tool 26 Upper spline shaft 27 Adapter member 28 Arm member 28a Mounting portion (mounting surface)
DESCRIPTION OF SYMBOLS 29 Sensor holder member 30 Optical fiber sensor 30a Eccentric collar 30b Lens 31 Lower spline shaft 32 Fixing member 40 Rotary head 41, 41a Spindle 41b Elastic body 42 Nozzle (component holder)
42a Reflecting surface 43 Coil spring (elastic body)
50 Positioning jig 51 Fastening part 52 Positioning part (positioning surface)
60 Sensor positioning jig 61 Positioning part 62 Position fixing part 63 Target position part

Claims (9)

In a component holding head of a surface mounter comprising a spindle and an elevating member for elevating the spindle in the Z direction along the axial direction, and mounting a component holder on the lower end of the spindle,
A component holding head of a surface mounter, wherein a sensor for detecting the component holder is connected to the elevating member via a position adjusting mechanism.   The component holding head of the surface mounter according to claim 1, wherein the sensor is an optical fiber sensor, and the optical fiber sensor includes an optical axis direction adjusting means for adjusting an optical axis direction thereof.   The component holding head of the surface mounter according to claim 1, wherein the position adjustment mechanism includes an XY direction position adjustment member for adjusting a position of the sensor in an XY direction perpendicular to the Z direction.   The component holding head of the surface mounter according to claim 1, wherein the position adjusting mechanism includes a Z direction position adjusting member for adjusting a position of the sensor in the Z direction.   The position adjustment mechanism includes an XY direction position adjustment member for adjusting the position of the sensor in the XY direction perpendicular to the Z direction, and a Z direction position adjustment member for adjusting the position of the sensor in the Z direction. A component holding head of a surface mounter according to claim 1 or 2.   The surface mounter according to claim 5, wherein an arm member is connected to the elevating member via the XY direction position adjusting member, and the sensor is connected to the arm member via the Z direction position adjusting member. Parts holding head.   7. The component mounting head of the surface mounting machine according to claim 6, wherein the arm member is positioned in the X and Y directions by a positioning jig attached to the main frame of the component holding head. A method for positioning a sensor in a holding head.   The component holding head of the surface mounter according to claim 1, wherein the sensor is a sensor positioning jig used in the component holding head of the surface mounter, wherein the sensor is an optical fiber sensor, A sensor positioning jig having a positioning part for positioning with respect to the main frame, a position fixing part for fixing the position of the spindle, and a target position part indicating a target position of the optical axis of the optical fiber sensor .   A sensor positioning method using the sensor positioning jig according to claim 8, wherein the positioning unit is positioned on the main frame, and the position fixing unit fixes the position of the spindle. A method of positioning a sensor in a component holding head of a surface mounter, wherein the position of the optical fiber sensor is adjusted by the position adjusting mechanism so that the optical axis of the fiber sensor is aligned with the target position.

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