JP4607686B2 - Tape feeder and surface mounter - Google Patents

Description

  The present invention relates to a tape feeder that is mounted on a surface mounting machine and supplies mounting components using a tape as a carrier.

  Conventionally, a tape feeder is generally known as an apparatus for supplying components for mounting in a surface mounter. This feeder holds a tape containing parts at regular intervals wound around a reel, and feeds the tape from the reel to the part take-out part in front of the feeder, while using the tape as a carrier to put the part in the part take-out part. The tape is fed out by the tape feeding mechanism as the component is picked up by the component mounting head.

  The tape feeding mechanism has a sprocket that engages with the tape, and is configured to feed the tape at a constant pitch corresponding to the pitch of the storage components by rotationally driving the sprocket with a motor.

  In surface mounters, a number of tape feeders as described above are set in parallel in the component supply unit, and mounted on the board while selectively removing components from these feeders. With the diversification, it is required to mount many tape feeders on one surface mounter. On the other hand, there is a tendency for the space of the component supply unit to be limited due to the demand for space saving of surface mounters. Therefore, the tape feeder can be made thin so that more tape feeders can be arranged in parallel with the component supply unit. It has been demanded.

  On the other hand, in this type of tape feeder, a sprocket and a motor are incorporated in the feeder so that the central axes of rotation are parallel or coincide with each other, and thereby the sprocket is driven directly or via a gear transmission mechanism or the like. However, since the rotary encoder, etc. is integrated into the motor to accurately feed the tape, the space occupied by the motor itself (the space occupied in the direction of the rotation axis) is relatively large, which makes the tape feeder thinner. This is one factor that hinders this.

  The present invention has been made in view of the circumstances as described above, and provides a tape feeder capable of effectively reducing the thickness while accurately feeding the pitch of the tape as before. Another object of the present invention is to provide a surface mounter that can proceed with the mounting work while supplying a wider variety of parts while meeting the demand for space saving.

In order to solve the above-mentioned problems, the tape feeder of the present invention is configured to send a tape containing components at regular intervals to a component supply unit by rotating a sprocket engaged with the tape by a motor. And a tape feeder in which the sprocket and the motor are arranged so that the central axes of rotation are parallel or coincide with each other,
The motor includes a stator that is mounted on a substrate in a state in which a plurality of stator coils are arranged in the circumferential direction, and a plurality of rotor magnets that are arranged in a circumferential arrangement in the vicinity of the stator coil. A motor having a flat rotor is provided, and the sprocket is disposed on the side opposite to the substrate with the motor as a boundary, and a change in the magnetic field can be detected in a space between the substrate side end surface of the sprocket and the substrate. A magnetic sensor is provided, and a magnetic field changing member that generates a change in the magnetic field detected by the magnetic sensor is provided in a circumferential direction facing the magnetic sensor in the space. Thus, the magnetic field changing member and the magnetic sensor constitute an encoder for detecting the rotational position of the motor (claim 1).

  According to this configuration, the magnetic sensor capable of detecting a change in the magnetic field is provided in the space between the substrate-side end surface of the sprocket and the substrate, and the magnetic field changing member is opposed to the magnetic sensor in the circumferential direction in the space. Thus, the exclusive space including the radial gap type or thrust gap type motor and encoder can be reduced in the width direction of the feeder, that is, in the direction perpendicular to the tape feeding direction.

  In this configuration, it is preferable that the magnetic sensor and the magnetic field changing member are arranged on a plane parallel to the substrate.

  In this case, since the magnetic sensor and the magnetic field changing member are arranged on a plane parallel to the substrate, the exclusive space including the motor and the encoder is orthogonal to the width direction of the feeder, that is, the tape feeding direction. It can be made smaller depending on the direction.

  A spur gear train that transmits the rotation of the rotor to the sprocket and whose center axis of rotation is parallel to the center axis of rotation of the rotor is disposed in the space between the rotor and the sprocket. It is preferable that the magnetic field changing member is arranged on the substrate side end face of the spur gear and the magnetic sensor is arranged in a direction perpendicular to a plane on which the magnetic field changing member is arranged.

  In this way, the magnetic field changing member is arranged using the end surface on the substrate side of the rotor or spur gear, and in addition to being able to be reduced in the direction perpendicular to the tape feeding direction, the component configuration is simplified. Can be planned.

  Further, the motor is a radial gap type motor in which the rotor magnet is arranged in a state of being arranged in the circumferential direction outside the radial direction of the stator coils arranged in the circumferential direction, and further, the magnetic field generated by the magnetic poles of the rotor magnet An encoder for detecting the rotational position of the motor is constituted by the magnetic pole and the magnetic sensor so that the magnetic pole functions as a magnetic field changing member by detecting a change with the magnetic sensor. Preferred (claim 4).

  In this way, the motor is a radial gap type motor, which can be made smaller in the direction orthogonal to the tape feeding direction, and that the magnetic sensor detects the change in the magnetic field due to the magnetic pole of the rotor magnet. By making the magnetic pole also function as a magnetic field changing member, it is possible to reduce the number of parts and to simplify the part configuration.

Further, by the rotor magnet to the sprocket is fixed directly, the rotor of the motor and said sprocket preferably is integrally of (claim 5).

  According to this configuration, the tape feeding mechanism is more compact and simple.

  Further, it is preferable that a control circuit for the motor is incorporated in the substrate of the motor.

  This eliminates the need for individually assembling the motor control board, and accordingly, the tape feed mechanism and its surroundings are more compact and simple.

  On the other hand, the surface mounting machine according to the present invention includes a movable head for component adsorption, and a plurality of tape feeders that supply components to a predetermined component extraction position while sending out a tape containing components at regular intervals. In the surface mounting machine comprised so that components may be adsorbed from a desired tape feeder by the head, and it mounts on a substrate, the tape feeder according to any one of claims 1 to 5 is provided as the tape feeder. (Claim 7).

  According to this surface mounter, a large number of tape feeders are arranged in a direction crossing (for example, orthogonal to) the tape feeding direction, and the tape feeder as described above (claims 1 to 6). As a result of the application of the tape feeder, the space occupied by each tape feeder can be reduced in the direction of arrangement.

  According to the tape feeder of the present invention, it is possible to reduce the occupied space of the motor including the encoder in the width direction of the feeder, that is, the direction orthogonal to the tape feeding direction, while providing the encoder. While allowing the tape to be accurately fed, the tape feeder can be effectively reduced in thickness.

  And, according to the surface mounter of the present invention, since the tape feeder as described above is mounted, more tape feeders can be juxtaposed in a small space, and as a result, the surface mounter is configured compactly. On the other hand, it is possible to proceed with the mounting operation while supplying a wider variety of parts.

  Embodiments of the present invention will be described with reference to the drawings.

  1 and 2 schematically show the overall configuration of a surface mounter according to the present invention (a surface mounter to which a tape feeder according to the present invention is applied).

  In these figures, a substrate conveying conveyor 2 is arranged on a base 1 of a surface mounting machine (hereinafter abbreviated as a mounting machine), and a printed circuit board 3 is conveyed on the conveyor 2 to perform a predetermined mounting. It is stopped at the work position and is held by a substrate holding means such as a push-up pin (not shown). In the following description, the direction of the conveyor 2 is the X-axis direction, the direction orthogonal to the X-axis on the horizontal plane is the Y-axis direction, and the direction orthogonal to the X-axis and the Y-axis is the Z-axis direction. .

  On both sides of the conveyor 2, component supply units 4 for supplying electronic components to be mounted on the printed circuit board 3 are provided. In these component supply units 4, multiple rows of tape feeders 4 a are arranged in the X-axis direction. Each tape feeder 4a is detachably mounted with a reel wound with a postscript tape that stores and holds small chip components such as ICs, transistors, capacitors, etc., from this reel to the component take-out section at the tip of the feeder. A component stored in the tape is picked up by a head unit 5 described later while intermittently feeding out the tape. The configuration of the tape feeder 4a will be described in detail later.

  Above the base 1, a component mounting head unit 5 is further provided. The head unit 5 is movable in the X-axis direction and the Y-axis direction within a certain region so that the components can be sucked from the component supply unit 4 and mounted on the printed circuit board 3.

  That is, the support member 11 of the head unit 5 is arranged on the base 1 so as to be movable on the fixed rail 7 in the Y-axis direction, and the head unit 5 extends along the guide member 14 in the X-axis direction on the support member 11. It is supported so that it can move. The support member 11 is screwed to the ball screw 8 driven by the Y-axis servo motor 9 so that the support member 11 is moved in the Y-axis direction while being driven by the X-axis servo motor 15. When the head unit 5 is mounted on the ball screw 13, the head unit 5 is configured to move in the X-axis direction.

  The head unit 5 is mounted with a plurality of mounting heads 20 for sucking components and mounting them on the printed circuit board 3. In this embodiment, the four mounting heads 20 are arranged in a row in the X-axis direction. It is mounted in a state arranged in.

  These mounting heads 20 are connected to an elevating mechanism using a Z-axis servomotor (not shown) as a drive source and connected to a rotating mechanism using an R-axis servomotor (not shown) as a drive source, respectively. By these mechanisms, the head unit 5 is driven in the vertical direction (Z-axis direction) and around its own axis (referred to as the R-axis direction).

  Further, a nozzle 21 for sucking components is provided at the tip of each mounting head 20. Each nozzle 21 is connected to a negative pressure supply means via a valve or the like (not shown). When taking out a part from the tape feeder 4a, the negative pressure is supplied to the tip of the nozzle 21 to attract the part. To be done. The nozzle 21 is detachably attached to the mounting head 20, and other nozzles 21 housed in a nozzle station (not shown) on the base 1 as necessary, that is, the tip shape and the like. The nozzles 21 are automatically exchanged with other nozzles 21 having different sizes.

  On the base 1, a component recognition camera 17 is further provided for recognizing an image of the suction state of the component by each mounting head 20. The component recognition camera 17 is provided between the conveyor 2 and the front side (lower side in FIG. 1) component supply unit 4, and the head unit 5 is arranged at a predetermined imaging position above the component recognition camera 17. When this is done, the suction component by each mounting head 21 is imaged from below.

  With the above configuration, in the mounting machine, components are mounted on the printed circuit board 3 as follows.

  First, the head unit 5 moves above the component supply unit 4, and components are removed from the tape feeder 4 a by each mounting head 20. Specifically, the predetermined mounting head 20 to which the component is to be sucked descends to attract the component, and further rises in a state of attracting the component, thereby picking up the component from the tape feeder 4a. At this time, if possible, the components are simultaneously taken out by the plurality of mounting heads 20.

  When the suction of the components by all the mounting heads 20 is completed, the head unit 5 moves above the component recognition camera 17, and each suction component is imaged, so that the suction state of each component is determined based on the imaging result. Be examined. Then, after the head unit 5 is moved onto the printed circuit board 3, the mounting heads 20 are moved up and down while the head unit 5 is moved sequentially to a predetermined component mounting point. Implemented above.

  FIG. 3 schematically shows the configuration of the tape feeder 4a.

  As shown in the figure, the tape feeder 4a is moved back and forth between a box-shaped feeder main body 25 flat in the width direction (X-axis direction) and a plate-like reel support 26 connected to the feeder main body 25. In the state where the front end side, that is, the feeder main body 25 is directed to the conveyor 2 side, it is set on the feeder mounting base 6 provided in the component supply section 4, and this mounting base 6 is attached to the mounting base 6 by a clamping means (not shown). On the other hand, it is detachably fixed.

  In the example of FIG. 3, the side surface of the feeder main body 25 is shown in an open state (the state where the tape feeding mechanism and the take-off mechanism are exposed), but usually the side plate 25a (see FIG. 5) is provided in this portion. Is attached, the tape feeding mechanism and the like are concealed inside the feeder main body 25.

  A reel 31 having a tape 32 wound around its rear end portion (left end portion in FIG. 3) is rotatably held by the reel support portion 26, and the tape 32 is transferred from the reel 31 to the feeder main body portion 25 at the front. Has been derived.

  The tape 32 stores and holds small pieces of components such as ICs, transistors, capacitors, etc. at regular intervals. As shown in FIG. 4, a carrier tape 33 and a cover tape adhered to the carrier tape 33 are provided. 34. The carrier tape 33 has hollow component storage portions 33a opened upward at regular intervals, and components such as ICs are stored in the respective component storage portions 33a. Further, on one side of the carrier tape 33, engagement holes 33b penetrating along the edge in the tape thickness direction are provided at regular intervals. On the other hand, the cover tape 34 is bonded to the upper surface of the carrier tape 33 so as to cover a portion where the component storage portion 33a is opened.

  As shown in FIG. 3, a guide portion 35 extending in the front-rear direction (Y-axis direction) is provided on the upper portion of the feeder main body portion 25, and a cover member 36 is provided so as to cover the upper portion. The tape 32 led out from is guided below the cover member 36 along the guide portion 35.

  A component take-out portion 37 is provided at the front end portion of the feeder main body portion 25. The component take-out portion 37 is a portion where components are picked up by the mounting head 20, and in this portion, the tape 32 guided along the guide portion 35 is exposed upward through the notch portion 36 a of the cover member 36. At the same time, the cover tape 34 is peeled off from the tape 32 while being folded back along the edge of the notch 36a, whereby the component storage portion 33a of the tape 32 (carrier tape 33) is opened upward, The component can be taken out by the mounting head 20.

  Inside the feeder main body 25, a tape feeding mechanism and a take-up mechanism for the cover tape 34 are provided.

  The tape feed mechanism feeds the tape 32 along the guide portion 35 while pulling out the tape 31 from the reel 31, and includes a sprocket 50 disposed below the component take-out portion 37 and a feed motor that directly drives (direct drive) the sprocket 50. 42.

  The sprocket 50 has a part of its outer edge facing the guide part 35 through an opening formed in the inner ceiling part of the feeder main body 25, and a part of its teeth are fitted in the engagement hole 33b. By doing so, the tape 32 is engaged. That is, when the sprocket 50 is rotationally driven by the feed motor 42, the tape 32 is intermittently delivered at a constant pitch corresponding to the pitch of the component storage portion 33a while the tape 32 is pulled out from the reel 31 along with this rotation. It has come to be.

  The feed motor 42 is a radial gap type flat motor, and has a board-integrated configuration integrally incorporated in the printed board 40 as shown in FIG. Specifically, as shown in the figure, a plurality of stator coils 44 are mounted in a circumferential direction on one side of a printed board 40 (hereinafter referred to as a motor board 40 to be distinguished from the printed board 3 to be mounted). As a result, a stator is formed, and a rotation shaft 48 is arranged at the center of the arrangement of the stator coils 44, and the rotation shaft 48 is rotatably supported with respect to the motor substrate 40. A flat cup-type rotor 46 that covers these stator coils 44 from the outside in the radial direction is fixed to the rotary shaft 48, and a plurality of rotor magnets 47 are arranged in the circumferential direction on the inner peripheral surface of the cup-type rotor 46. In addition, the stator coil 44 is assembled with a predetermined gap. The rotor magnet 47 has an N-pole or S-pole magnetic pole at the inner end on the rotating shaft 48 side, and an S-pole or N-pole magnetic pole on the rotor 46 side.

  In the feed motor 42, the motor substrate 40 is fixed to the inner side surface of the feeder main body 25 via an insulating sheet, a spacer, or the like, so that the rotating shaft 48 feeds the tape 32 (left and right in FIG. 5). Are assembled to the main body 25 in a posture orthogonal to the main body 25. Then, the sprocket 50 is mounted and fixed integrally with the rotary shaft 48, whereby the rotor 46 and the sprocket 50 are integrally rotated via the rotary shaft 48 when the feed motor 42 is operated.

  A magnetic sensor 41 made up of a Hall element is further mounted on the motor substrate 40 in the vicinity of the feed motor 42, and the magnetic sensor 41 forms a magnetic pole (N pole, S pole) of the rotor magnet 47 from the outside of the rotor 46. ) Is detected. That is, the magnetic pole of the rotor magnet 47 functions as a magnetic field changing member that rotates the rotor 46 with the stator coil 44 and changes the strength of the magnetic field closest to the magnetic sensor 41. The magnetic sensor 41 can detect the timing at which the strength of the magnetic field is maximized, that is, the position where the magnetic pole faces the magnetic sensor 41, and can detect the rotational angle position of the rotor 46. That is, the magnetic sensor 41 and the rotor 46 constitute an encoder for detecting the position of the rotary shaft 48. When the tape 32 is fed, the feed motor 42 is based on the detection of the magnetic pole by the magnetic sensor 41. The drive is controlled.

  On the other hand, the take-off mechanism is to peel off the cover tape 34 from the tape 32 (carrier tape 33). This take-up mechanism is provided in the feeder main body 25 on the rear side of the tape feeding mechanism, and draws the rotational driving force of the take-up motor 52, the take-off gear pairs 56a and 56b, and the take-up motor 52. It consists of gears 54, 50, etc. that transmit to take-off gear pairs 56a, 56b. The cover tape 34 peeled off from the tape 32 by the notch 36a is guided between the take-off gear pairs 56a and 56b, and the take-off gear pair 56a is actuated by the operation of the take-off motor 52 when supplying parts. 56b are driven to rotate, and the cover tape 34 is peeled off from the carrier tape 33 by the pulling force (rotational force).

  Similarly to the feed motor 42 of the tape feed mechanism, the take-up motor 52 of the take-up mechanism is composed of a radial gap type flat motor integrated into a printed circuit board. In the present embodiment, as shown in FIG. 3, the take-up motor 52 is incorporated in the same motor substrate 40 as the feeding motor 42 of the tape feeding mechanism, and the feeder main body 25 is integrated with the feeding motor 42. It is fixed to the inner surface. The take-off gear pairs 56a and 56b and the transmission gear 55 are pivotally supported on the same surface of the feeder main body 25 as the motor substrate 40 is assembled, while the take-up motor 52 rotates. The gear 54 is mounted on the shaft, and the gear 54 and the gear 55 are provided in mesh with each other.

  Although not shown in detail, a control circuit for driving and controlling the motors 42 and 52 is integrally incorporated in the motor board 40. During the mounting operation, the control circuit controls the motors 42 and 44. By controlling the driving, the parts are continuously supplied by the tape feeder 4a.

  That is, when the component is taken out by the mounting head 20, the feed motor 42 and the take-out motor 52 are driven, and the next component is supplied to the component take-out portion 37 by this drive. Specifically, when the sprocket 50 is rotationally driven by the feed motor 42, the tape 32 is drawn from the reel 31 and fed to the component take-out portion 37, while the take-off gear pair 56a, 56b is taken by the take-up motor 52. Is rotated, the cover tape 34 is peeled off from the tape 32 (carrier tape 33). As a result, the component storage unit 33a is opened upward while being sent to the component extraction unit 37, and is placed in the component extraction unit 37 in a state where the next component can be extracted. At this time, the rotation angle (rotation amount) of the feed motor 42 is controlled based on the detection of the magnetic poles of the rotor magnet 47 by the magnetic sensor 41, and the take-up motor 52 is driven and controlled in synchronism with this. The motors 42 and 52 are driven by a rotation angle corresponding to the arrangement pitch of the component storage portions 33a. As a result, the component storage portion 33 a storing the next component is accurately arranged with respect to the component extraction portion 37 in a state where the cover tape 34 is appropriately peeled off. Thereafter, as the components are taken out by the mounting head 20, the tape 32 is intermittently sent out at a constant pitch, and the cover tape 34 is peeled in synchronization with this, whereby the components are intermittently supplied. Will be supplied.

  According to the tape feeder 4a as described above, the feed motor 42 of the tape feed mechanism is composed of a radial gap type flat motor integrated with the motor substrate 40 as described above, and the encoder of the feed motor 42 Since the magnetic sensor 41 arranged outside the motor 42 (radially outside) detects the magnetic pole of the rotor magnet 47, the configuration of the motor 42 including the encoder is flat, that is, in the width direction of the tape feeder 4a. It becomes a flat structure. In addition, since a so-called direct drive structure in which the sprocket 50 is directly fixed to the rotating shaft 48 of the feed motor 42 thus flattened is adopted, as shown in FIG. The mechanism is extremely compact in the width direction of the tape feeder 4a.

  Therefore, this type of conventional tape feeder, that is, a tape feed mechanism motor, for example, an inner rotor type motor integrated with a rotary encoder or the like is provided, and a sprocket is driven using a plurality of transmission gears. Compared to the tape feeder, the tape feeder 4a is effectively reduced in size in the width direction, that is, thinner, while the sprocket 50 is driven with high accuracy by providing an encoder.

  In particular, in this tape feeder 4a, a radial gap type flat motor integrated with a printed circuit board is used as a drive source for the take-up mechanism of the cover tape 34, as is the case with the feed motor 42. Also, the configuration is flat in the width direction. In addition, the feed motor 42 and the take-off motor 52 are integrated into a common motor board 40, and a control circuit for controlling the motors 42 and 52 is integrated into the motor board 40. Therefore, compared to a configuration in which a control board is provided separately from the motor and these are individually connected by electric wires etc., the configuration of the tape feed and take-up drive mechanism is compact, and in this respect also the tape feeder 4a is effectively thinned.

  Therefore, according to the surface mounter as described above that mounts the tape feeder 4a thus thinned, a larger number of tape feeders 4a can be juxtaposed in a small space, thereby making the surface mounter compact. On the other hand, mounting processing can be performed on the printed circuit board while supplying a wider variety of components.

  The surface mounter described above is an example of a surface mounter according to the present invention (a surface mounter to which the tape feeder according to the present invention is applied), and its specific configuration or specific tape feeder. Such a configuration can be appropriately changed without departing from the gist of the present invention. For example, the following aspects can be adopted.

(1) In the embodiment has a configuration assembled in the motor 42 send sprocket 50, a rotor 46 and the sprocket 50 may be employed together phased configurations. That is, as shown in FIG. 6, a rotor 46 provided coaxially with a sprocket portion 46a and a cylindrical boss portion 46b provided integrally with the sprocket portion 46a and provided with a rotor magnet 47 on the inner peripheral surface. The rotor 46 may be mounted and fixed to the rotary shaft 48. According to integrally phased constituting the rotor and the sprocket of the motor 42 feeding this manner, it is possible to downsize (flattened) further width direction of the tape feeding mechanism, to further promote the thinning of the tape feeders 4a It becomes possible.

  (2) In the embodiment and the example of (1) above, a so-called direct drive configuration is employed in which the sprocket 50 (46a) is directly driven by the feed motor 42, but a gear transmission mechanism or a belt transmission mechanism is used. The sprocket 50 may be driven by the feed motor 42. FIG. 7 shows an example in which a gear transmission mechanism is applied. In the illustrated example, the feed motor 42 (motor substrate 40) is assembled on one side of the side surfaces of the feeder main body 25 facing in the width direction, and the sprocket 50 is rotatably supported on the other side via a support shaft 51. Has been. A drive gear 57 is mounted and fixed on the rotation shaft 48 of the feed motor 42, and the gear 57 meshes with a gear 58 formed integrally with the sprocket 50, whereby the rotational drive force of the feed motor 42 is transmitted via the gears 57 and 58. Are transmitted to the sprocket 50.

  In this configuration, since the gears 57 and 58 are interposed between the sprocket 50 and the feed motor 42, the configuration of the tape feed mechanism is slightly increased in the width direction. However, the feed motor 42 is integrated into the motor board 40. Since this is a radial gap type flat motor and the encoder is configured by the magnetic sensor 41 and the rotor 46 arranged outside (radially outside) the feed motor 42, this is the same as in the above embodiment. Compared with a kind of tape feeder, the tape feeder 4a can be sufficiently thinned.

  (3) In the embodiment, the feed motor 42 and the take-up motor 52 are provided separately, but these motors may be shared. For example, in the configuration shown in FIG. 7, the gear 55 (see FIG. 3) may be engaged with the gear 57 of the feed motor 42. According to this configuration, a rational configuration in which the motor that is the drive source of the tape feeding mechanism and the take-off mechanism is shared is achieved.

  (4) In the embodiment, the feed motor 42, the take-up motor 52, and the magnetic sensor 41 are integrally incorporated in the common motor board 40, and the control circuits for the motors 42 and 52 are incorporated in the motor board 40. Of course, the motors 42 and 52 may be formed on separate printed circuit boards. The magnetic sensor 41 may also be provided separately from the feed motor 42. However, according to the configuration in which the motors 42 and 52, the magnetic sensor 41, and these control circuits are integrated into the common motor substrate 40 as in the embodiment, the drive mechanism portion of the tape feeder 4a has a compact and simple configuration. Therefore, it is advantageous in reducing the thickness of the tape feeder 4a, and there is an advantage that productivity is improved.

  (5) In the embodiment, the magnetic sensor 41 detects the rotational angle position of the magnetic poles of the rotor magnet 47 from the radially outer side of the rotor 46 (the boss portion 46b in FIG. 6). A plurality of magnets 61 independent of the rotor magnet 47 may be arranged in the circumferential direction on the outer side in the radial direction (FIG. 8A). According to this, even if the rotor 46 (or the boss portion 46b is a magnetic body), the magnetic sensor 41 detects a large change in the strength of the magnetic field, and can reliably detect the rotational angle position of the rotor 46.

  (6) In the embodiment, the magnet electrode is made to function as a magnetic field changing member. However, the boss portion 46b is formed of a magnetic material, and a plurality of teeth (corresponding to 46c in FIG. 8B) are provided on the outer side in the circumferential direction. The teeth may be provided and function as magnetic field changing members. That is, when the rotor is rotated in a state where a predetermined current is passed through the magnetic sensor 41, the magnetic permeability in the space in the immediate vicinity of the magnetic sensor 41 changes depending on the rotational position of the teeth, and the magnetic field in the immediate vicinity of the magnetic sensor 41 changes. As a result, the current returned from the magnetic sensor 41 changes, so that the rotational position of the rotor 46 can be detected from this feedback current waveform. That is, the teeth 46c on the outer periphery of the boss portion 46b function as a magnetic field changing member.

  (7) In the embodiment, the magnetic sensor 41 and the magnetic pole of the rotor magnet 47 as the magnetic field changing member are arranged on a plane parallel to the substrate, and the motor is arranged on the outer side in the radial direction of the stator coil 44 in which the rotor magnet 47 is arranged in the circumferential direction. In addition, the radial gap motor is arranged in a state of being arranged in the circumferential direction. However, a plurality of stator coils 63 that generate a magnetic field in the direction perpendicular to the substrate are arranged on the motor substrate 40 on the circumference centered on the rotation shaft 48, and the sprocket portion 46 a is arranged so as to face the stator coil 63. A thrust gap type motor may be provided in which a rotor magnet 65 is provided on the end surface 46d on the motor substrate 40 side. Even in this case, the magnetic sensor 51 and the teeth 46c on the outer periphery of the boss portion 46b functioning as a magnetic field changing member are arranged in the space between the substrate-side end face of the sprocket portion 46a and the motor substrate 40 (FIG. 8B). FIG. 8 (c)). Thereby, in addition to being able to make it small in the direction orthogonal to the direction which sends out a tape, sprocket part 46a can be functioned as a supporting member of rotor magnet 65, and simplification of parts composition can be aimed at.

  (8) The thing of FIG. 9 arrange | positions a reduction gear pair (gear train) between a motor and the sprocket 50, and the motor board 40 side end surface of the flat plate part 58 of the boss | hub part outer periphery of one of the reduction gears 58 in this is arranged. A plurality of magnets 67 as magnetic field changing members are arranged in the circumferential direction. The magnetic sensor 41 detects the rotation position of the reduction gear 58, that is, the reduction ratio, by detecting the change in the strength of the magnetic field perpendicular to the motor substrate 40 in the vicinity of the magnetic sensor 41, which is generated by the rotation of the magnet 67. Can be used to detect the rotational position of the motor. This can also be reduced in a direction perpendicular to the direction in which the tape is sent out.

It is a top view which shows the surface mounting machine (surface mounting machine with which the tape feeder which concerns on this invention is mounted) which concerns on this invention. It is a front view which shows a surface mounting machine. It is a perspective schematic diagram showing a tape feeder. It is a perspective view which shows the structure of the tape used with a tape feeder. It is sectional drawing of the tape feeder which shows the structure of a tape feeding mechanism. It is sectional drawing of the tape feeder which shows another structure of a tape feed mechanism. It is sectional drawing of the tape feeder which shows another structure of a tape feed mechanism. (A) is a fragmentary cross-sectional view of a tape feeder over showing still another structure of the tape feed mechanism, (b) is a fragmentary sectional view of the tape feeder over showing still another structure of the tape feed mechanism, (c) is It is sectional drawing along the 8 (c) -8 (c) line | wire of the tape feed mechanism shown to (b). It is a fragmentary cross-sectional view of the tape feeder over showing still another structure of the tape feed mechanism.

Explanation of symbols

4a Tape Feeder 25 Feeder Body 26 Reel Support 32 Tape 37 Parts Extraction 40 Printed Circuit Board; Motor Board 41 Magnetic Sensor 42 Feed Motor 44 Stator Coil 46 Rotor 47 Rotor Magnet 48 Rotating Shaft 50 Sprocket

Claims (7)

The tape containing the components at regular intervals is configured to be sent to the component supply unit by rotating the sprocket engaged with the tape by a motor, and the central axes of the rotations are parallel or coincide with each other. In the tape feeder in which the sprocket and the motor are arranged,
The motor includes a stator that is mounted on a substrate in a state in which a plurality of stator coils are arranged in the circumferential direction, and a plurality of rotor magnets that are arranged in a circumferential arrangement in the vicinity of the stator coil. A motor having a flat rotor is provided,
Furthermore, the sprocket is disposed on the side opposite the substrate with the motor as a boundary, and a magnetic sensor capable of detecting a change in the magnetic field is provided in a space between the substrate-side end surface of the sprocket and the substrate,
A magnetic field changing member that generates a change in the magnetic field detected by the magnetic sensor is provided on the rotor or the member that rotates in conjunction with the rotor in the circumferential direction facing the magnetic sensor in the space. An encoder for detecting the rotational position of the motor is constituted by a member and a magnetic sensor. In the tape feeder over according to claim 1,
A tape feeder, wherein the magnetic sensor and the magnetic field changing member are arranged on a plane parallel to the substrate. In the tape feeder over according to claim 1,
A spur gear train in which the rotation of the rotor is transmitted to the sprocket and the center axis of rotation is parallel to the center axis of rotation of the rotor is disposed in the space between the rotor and the sprocket,
The magnetic field changing member is disposed on the substrate side end surface of the sprocket or the spur gear constituting the spur gear train,
A tape feeder, wherein a magnetic sensor is arranged in a direction perpendicular to a plane on which the magnetic field changing member is arranged. The tape feeder according to claim 2,
The motor is a radial gap type motor in which the rotor magnet is arranged in a state of being arranged in the circumferential direction on the outer side in the radial direction of the stator coil arranged in the circumferential direction. An encoder for detecting the rotational position of the motor is constituted by the magnetic pole and the magnetic sensor so that the magnetic pole functions as a magnetic field changing member by detecting with the magnetic sensor. Tape feeder to be used. The tape feeder according to claim 4,
By the rotor magnet is fixed directly to the sprocket, tape feeder in which the rotor of the motor and said sprocket is characterized in that it is integrated with. The tape feeder according to any one of claims 1 to 5,
A tape feeder in which a control circuit of the motor is incorporated in a substrate of the motor. A movable head for picking up parts and a plurality of tape feeders for feeding parts to a predetermined part pick-up position while feeding out tapes containing parts at regular intervals, and picking up parts from the desired tape feeder by the heads In a surface mount machine configured to be mounted on a substrate,
A surface mounting machine comprising the tape feeder according to any one of claims 1 to 6 as the tape feeder.

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