JP2015191953A - Tape feeder and control method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tape feeder that can be accurately controlled with a compact and inexpensive construction with no expensive absolute encoder.SOLUTION: A tape feeder has an origin position specifying part for specifying a predetermined specific position in one rotation of a motor 20 as an origin position, a storage part for storing the rotational amount of the motor during feeding of a gear to a next gear position every gear 31 of a sprocket 30 which is fed through rotation of the motor 20 by a gar portion 40, and the rotation amount of the motor till the origin position, and a gear specifying part for specifying a gear of the sprocket at a predetermined position. The gear specifying part has a disc or cylinder which is provided on the same axis as the sprocket or on the same axis of the gears of the gear portion rotating at the same angular speed of the sprocket, and the disc face 51 of the disc or the cylinder peripheral surface of the cylinder is provided with an index 52 whose data varies according to a reading position when the disc surface or the cylinder peripheral surface is optically read.

Description

  The present invention relates to a tape feeder that transports a component by moving a tape holding the component by the rotation of a sprocket, and a control method for the tape feeder.

  Conventionally, as a technical document in such a field, there is JP 2007-173632 A. This publication describes a tape feeder to which a reel on which a tape containing electronic components is wound is attached and the components are conveyed by feeding the tape from the reel. The tape feeder described in this publication is provided with a tape feeding mechanism for feeding out a tape, and this tape feeding mechanism is fitted with a feed motor as a drive source, a plurality of gears, and a tape feed hole. And a sprocket. A magnetized portion is formed on the side surface of the sprocket with a predetermined pattern, and a magnetic sensor for detecting the magnetized portion is provided on the side plate of the tape feeder main body. The sprocket and the magnetic sensor An absolute encoder that detects the absolute position of the sprocket is constructed.

  The tape feeder described in this publication calculates the deviation of each tooth in the tape feed direction and the correction amount based on the image data of each tooth of the sprocket, and corrects the target position of the sprocket based on this correction amount. To do. In this way, the sprocket teeth can be stopped at the normal position by correcting the target position of the sprocket and performing feedback control on the rotational position of the sprocket.

JP 2007-173632 A

  By the way, in the tape feeder as described above, high accuracy is required for the position where the teeth of the sprocket are stopped in order to accurately convey the electronic component. However, there is a problem that the accuracy of the position where the teeth are stopped is actually lowered due to the dimensional error of the gear and sprocket teeth and backlash.

  Therefore, in the above-mentioned tape feeder, the accuracy of the tooth stop position is increased by increasing the resolution of the absolute encoder composed of the sprocket and the magnetic sensor, but if the resolution of the absolute encoder is increased in this way, the measured value There is a possibility that a problem arises that it is difficult to perform accurate control. In addition, there is a problem that an optical absolute encoder having a high resolution is increased in size because a large number of slits are provided. Furthermore, a magnetic absolute encoder with high resolution has a problem that the magnetism itself is likely to be unstable, which may make control more difficult. Furthermore, there is a problem that an absolute encoder with high resolution is expensive.

  Therefore, an object of the present invention is to provide a tape feeder that can perform accurate control with a small and inexpensive configuration without using an expensive absolute encoder, and a method for controlling the tape feeder.

  In order to solve the above-mentioned problems, the tape feeder of the present invention is a tape provided at predetermined intervals on a tape that holds the components by rotating the sprocket by transmitting the rotation of the motor to the sprocket through the gear portion. In a tape feeder that transports the parts by moving the tape as the sprocket rotates by fitting a feed hole for feeding into the sprocket teeth, a predetermined specification in one rotation of the motor An origin specifying unit that specifies the position of the motor as an origin position, and for each tooth of the sprocket that is sent by the rotation of the motor by the gear unit, the rotation amount of the motor when the tooth is sent to the next tooth A storage unit for storing the rotation amount of the motor up to the origin position, and a tooth characteristic for specifying the teeth of the sprocket at a predetermined position. And the tooth specifying portion is a disc surface of a disk or a cylindrical cylindrical portion peripheral surface provided coaxially with the sprocket or coaxially with the gear of the gear portion rotating at the same angular velocity as the sprocket. In addition, an index is provided in which data changes depending on a reading position when the disk surface or the cylindrical portion circumferential surface is optically read.

  Further, in the present invention, the tooth specifying portion includes an index whose concentration or line width changes stepwise or continuously, and the disc surface or the cylindrical portion circumferential surface provided with the index, or the circle It is preferable to have a light emitting element and a light receiving element so as to face the board surface or the circumferential surface of the cylindrical portion.

  Further, in the present invention, the tooth specifying portion is opposed to the index in which the concentration or shape changes continuously or intermittently, and the disk surface or the cylindrical portion circumferential surface provided with the index, the index. It is preferable to have an image sensor for imaging.

  Moreover, in this invention, it is preferable that the reading data of the said index | index of the said tooth specific part and each said tooth | gear of the said sprocket have a one-to-one relationship.

  Further, the tape feeder control method of the present invention is a tape feeder for rotating the sprocket by transmitting the rotation of the motor to the sprocket through the gear portion, and for feeding the tape provided at predetermined intervals on the tape holding the parts. A control method of a tape feeder that transports the parts by moving the tape as the sprocket rotates by fitting a feed hole with the teeth of the sprocket, the address being set for each tooth Correspondingly, the amount of rotation of the motor when it is sent to the next address is stored as a first pulse number, and the motor from the address set for each tooth to a predetermined origin position in one rotation of the motor Is stored as a second pulse number, and the data is read from an index whose data changes depending on the reading position. After specifying the teeth at a fixed position and rotating the motor to specify the origin position, the number of pulses indicating the rotation amount of the motor is based on the first pulse number and the second pulse number. The rotation of the motor is stopped when the number of pulses from the origin position to the next address is measured.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the tape feeder and the control method of this tape feeder which can perform exact control by a small and cheap structure, without using an expensive absolute encoder.

It is a side view which shows one Embodiment of the tape feeder which concerns on this invention. It is an enlarged view of the motor part of the tape feeder shown in FIG. It is an expanded sectional view of the motor part of the tape feeder shown in FIG. It is a side view which shows an example of the sprocket of the tape feeder which concerns on this invention, a gear part, and a motor. It is a perspective view of the sprocket of the tape feeder shown in FIG. 4, a gear part, and a motor. It is a side view which shows the other examples of the sprocket of the tape feeder which concerns on this invention, a gear part, and a motor. It is a perspective view of the sprocket of the tape feeder shown in FIG. 6, a gear part, and a motor. It is a perspective view which shows the example which provided the parameter | index with which a line | wire width changes continuously in a cylinder part surrounding surface. It is a figure which shows the map of a memory | storage part.

  The tape feeder of the present invention rotates the sprocket by transmitting the rotation of the motor to the sprocket via the gear portion, and the tape feed holes provided at predetermined intervals on the tape holding the parts are the teeth of the sprocket. In the tape feeder that moves the tape along with the rotation of the sprocket by being fitted to the conveyor and conveys the parts, an origin specifying unit that specifies a predetermined specific position in one rotation of the motor as the origin position, and a gear For each sprocket tooth sent by the rotation of the motor by the unit, a storage unit for storing the motor rotation amount when the tooth is sent to the next tooth and the motor rotation amount up to the origin position, and a sprocket at a predetermined position A tooth specifying portion that specifies the tooth of the gear, and the tooth specifying portion rotates coaxially with the sprocket or at the same angular velocity as the sprocket. The gear and the disc surface or the cylindrical portion peripheral surface of the cylinder of a disk provided coaxially parts, the index data is changed by the reading position when reading the disc surface or the cylindrical portion peripheral surface optically is provided.

  In the above tape feeder, the sprocket teeth are sent by the rotation of the motor by the gear portion, so the rotation of the motor is decelerated by the gear and transmitted to the sprocket. Therefore, it is possible to accurately adjust the stop position of the sprocket teeth by rotating the motor by a rotation amount corresponding to the sprocket teeth stored in the storage unit and decelerating the rotation with the gear. The accuracy of the tooth stop position can be increased. Further, the storage unit stores the rotation amount of the motor when the teeth are sent to the next tooth for each sprocket tooth and the rotation amount of the motor to the origin position for each sprocket tooth. As described above, the storage unit stores in advance, for each tooth, the rotation amount of the motor in consideration of the dimensional error of the sprocket and the gear train and the backlash.

  Furthermore, if the tooth specifying unit specifies a tooth at a predetermined position, the motor is rotated by the amount of rotation stored in the storage unit according to the tooth, so an absolute encoder that detects the position of the sprocket tooth is provided. Without using it, the accuracy of the stop position of the sprocket teeth can be increased. In addition, since the accuracy of the tooth stop position is increased by rotating the motor by a pre-stored rotation amount, there is no need for an absolute encoder, and there is a problem that the device becomes large or difficult to control. It does not occur and it is possible to perform accurate control.

  Preferably, in the present invention, the tooth specifying unit includes an indicator in which the concentration changes stepwise to change the amount of transmitted light, and a light emitting element and a light receiving element sandwiching a disk surface or a cylindrical portion peripheral surface provided with the indicator. Have it.

  With such a configuration, the read data changes step by step, and the correspondence between the read data and the teeth becomes easy.

  In the present invention, it is preferable that the tooth specifying portion includes a light emitting element and a light receiving element sandwiching an index in which a line width continuously changes and a transmitted light amount changes, and a disk surface or a cylindrical portion peripheral surface provided with the index. To have.

  With such a configuration, the resolution can be increased and accurate tooth specification can be performed.

  Preferably, in the present invention, the tooth specifying portion includes an indicator in which the concentration changes stepwise and the amount of reflected light changes, and a light emitting element facing the disk surface or the cylindrical portion peripheral surface provided with the indicator. A light receiving element is provided.

  By adopting such a configuration, the read data changes stepwise, so that the correspondence between the read data and the teeth becomes easy, and the apparatus can be miniaturized by providing the light emitting element and the light receiving element on one side. .

  Preferably, in the present invention, the tooth specifying portion is a light emitting element facing the disk surface or the cylindrical portion peripheral surface on which the index is changed and the reflection amount of the light is changed by continuously changing the line width. And a light receiving element.

  With such a configuration, it is possible to increase the resolution and specify the teeth accurately, and it is possible to reduce the size of the apparatus by providing the light emitting element and the light receiving element on one side.

  Preferably, in the present invention, the tooth specifying part includes an index whose shape changes continuously, and an imaging element for imaging the shape of the index facing the disk surface or the cylindrical surface provided with the index. Have it.

  With such a configuration, it is only necessary to provide an image sensor, so that the configuration can be simplified.

  Preferably, in the present invention, the tooth specifying unit includes an index for intermittently changing the shape, and an imaging element for imaging the shape of the index facing the disk surface or the cylindrical surface provided with the index. Have it.

  With such a configuration, it is only necessary to provide an image sensor, so that the configuration can be simplified and various shapes can be used as indices.

  In the present invention, preferably, the reading data of the index of the tooth specifying portion and each tooth of the sprocket are associated with each other in a one-to-one relationship.

  With this configuration, it is easy to specify each tooth based on the read data.

  Also, the tape feeder control method of the present invention is such that the rotation of the motor is transmitted to the sprocket via the gear portion to rotate the sprocket, and the tape feeding feed provided at predetermined intervals on the tape holding the parts. A method of controlling a tape feeder that transports parts by moving a tape as the sprocket rotates by fitting holes into the sprocket teeth, and corresponding to the address set for each tooth The motor rotation amount when sending to the address is stored as the first pulse number, and the motor rotation amount from the address set for each tooth to the predetermined origin position in one rotation of the motor is the second pulse number. As a result, the tooth at the predetermined position of the sprocket is specified by reading the data from the index whose data changes depending on the reading position, and the motor After rotating and specifying the origin position, based on the first pulse number and the second pulse number, the number of pulses indicating the motor rotation amount is measured when the number of pulses from the origin position to the next address is measured. Stop.

  More specifically, for example, using the above-described tape feeder of the present invention, the rotation amount of the motor when sending to the next address corresponding to the address set for each tooth in the storage unit is set to the first pulse number. And store the rotation amount of the motor from the address set for each tooth to the origin position as the second pulse number, and specify the tooth at the predetermined position of the sprocket by reading the index of the tooth specifying part After the motor is rotated and the origin specifying unit specifies the origin position, the first pulse number and tooth specifying unit corresponding to the address next to the address specified by the tooth specifying unit stored in the storage unit are specified. The rotation of the motor is stopped when the number of pulses indicating the amount of rotation of the motor is measured from the origin position to the next address based on the second number of pulses corresponding from the address to the origin position.

  The storage unit stores the rotation amount of the motor when the tooth is sent to the next tooth for each sprocket tooth as the first pulse number, and stores the rotation amount of the motor up to the origin position for each sprocket tooth. It is memorized as the second pulse number. Then, after the tooth specifying unit specifies the tooth address at a predetermined position, the origin position is specified by rotating the motor, and then the first pulse number corresponding to the address next to the address specified by the tooth specifying unit and Referring to the second pulse number up to the origin position, the motor is rotated from the origin position by a predetermined number of pulses. Thus, the accuracy of the tooth stop position can be improved by rotating the motor by the number of pulses corresponding to the next address from the origin position of the motor.

  Hereinafter, embodiments of a tape feeder and a control method according to the present invention will be described in detail with reference to the drawings.

An example in which a light emitting element and a light receiving element are provided on the tooth specifying portion with a disk surface provided with an index in which the concentration changes stepwise over 360 degrees and the amount of transmitted light is changed is illustrated in FIGS. 9 will be described.
As shown in FIG. 1, the tape feeder 1 is used by being detachably mounted on a surface mounter for mounting small pieces of electronic components such as a resistor, a capacitor, an IC, and a transistor on a substrate. The tape feeder 1 is mounted with a reel 2 around which the tape 3 holding the electronic component is wound. From this reel 2, the tape 3 is intermittently fed out one pitch at a time by the tape feeding mechanism 10. Then, the electronic component of the tape 3 is fed to the component take-out unit 4 at the upper part of the tape feeding mechanism 10 and is sucked by a head unit (not shown) of the surface mounter, and the sucked electronic component is picked up by the surface mounter. It is mounted on the substrate by the head.

  The tape 3 is provided with feed holes (not shown) for feeding the tape 3 at predetermined intervals in the extending direction of the tape 3, and the teeth 31 of the sprocket 30 (see FIG. 4) ) Are fitted. When the sprocket 30 is fed one pitch at a time with the teeth 31 of the sprocket 30 fitted in the feed holes of the tape 3, the tape 3 moves and the electronic components are conveyed.

  The tape feeding mechanism 10 of the tape feeder 1 includes a control board 11 having a CPU, a ROM, a RAM or both for controlling the tape feeding mechanism 10, a motor 20 that operates in response to a control signal from the control board 11, and a tape 3. A sprocket 30 that feeds one pitch at a time and a gear train (gear part) 40 (see FIGS. 4 and 5) that transmits the rotational driving force of the motor 20 to the sprocket 30 are provided. The control signal from the control board 11 is output to the motor 20 through the flexible printed circuit board 14.

  As shown in FIGS. 2 and 3, the motor 20 includes a rotor 27 having a rotor magnet 24 fixed to the motor shaft 25, and a stator 26 having a coil 26 b facing the outer peripheral surface of the rotor magnet 24. ing. The stator 26 includes a coil 26b and a core 26a around which the coil 26b is wound. The rotor 27 is rotated by a certain angle by a pulse from the control board 11 supplied to the coil 26b of the stator 26. A motor shaft 25 that rotates together with the rotor 27 is inserted into a shaft hole of a cylindrical bearing 29. The rotor 27 of the motor 20 rotates once, for example, with 500 pulses. In the following embodiment, the description will be made assuming that the rotor 27 of the motor 20 rotates once with 500 pulses. The motor 20 includes an optical encoder 21 having an encoder function for detecting the rotational position of the rotor 27, a wheel element group 22 for detecting the rotational direction and rotational speed of the rotor 27 of the motor 20, and the rotor 27 of the motor 20. And an origin specifying hole element (origin specifying unit) 23 for specifying the origin position.

  As shown in FIG. 3, the optical encoder 21 is an incremental optical encoder that includes an encoder slit plate 21a and a light projecting / receiving optical element 21b. The encoder slit plate 21a is a disk-like member fixed to the motor shaft 25 of the motor 20, and a slit pattern is formed in the circumferential direction. The light projecting / receiving optical element 21b of the optical encoder 21 is disposed at a position facing the encoder slit plate 21a.

  The light projecting / receiving optical element 21b emits light toward the encoder slit plate 21a, does not receive the light transmitted through the slit of the encoder slit plate 21a, and receives only the reflected light. The light projecting / receiving optical element 21b detects the on / off of the reflected light by receiving only the reflected light without receiving the light transmitted by the encoder slit plate 21a, and the detection accompanying this on / off. The signal is output to the control board 11 via the flexible printed circuit board 14. On the control board 11, the rotational position of the rotor 27 of the motor 20 can be known from the detection signal from the optical encoder 21.

  As shown in FIG. 2, the rotor magnet 24 is a magnet in which N poles and S poles are alternately formed in the circumferential direction. A wheel element group 22 and an origin specifying hole element 23 face the rotor magnet 24. The hole element group 22 includes three hole elements 22a, 22b, and 22c arranged in parallel in the circumferential direction. Each wheel element 22 a, 22 b, 22 c outputs a signal corresponding to a change in magnetic field due to the rotation of the rotor 27 of the motor 20 to the control board 11. In the control board 11, the rotational speed and direction of the rotor 27 can be detected by signals from the respective wheel elements 22a, 22b and 22c. Based on the detected rotational speed and direction, the control board 11 Drive control of the motor 20 is performed.

  The control board 11 determines a specific rotation position while the rotor 27 rotates 360 degrees from the waveform of the signal from the origin specifying hole element 23 as the origin position, and uses this origin position as a reference as will be described later. The rotor 27 is rotated.

  Further, when the motor 20 is driven, the gears constituting the gear train 40 are rotated accordingly. As shown in FIG. 4, the gear train 40 includes a first spur gear 41 that rotates coaxially with the motor shaft 25 of the motor 20 and a second spur gear 42 that meshes with the first spur gear 41. A third spur gear 43 that is coaxial with the second spur gear 42 and rotates with the second spur gear 42, a fourth spur gear 44 that meshes with the third spur gear 43, and a fourth spur gear. A fifth spur gear 45 that rotates coaxially with the fourth spur gear 44 and a sixth spur gear 46 that meshes with the fifth spur gear 45.

  The sprocket 30 is coaxial with the sixth spur gear 46 and rotates with the sixth spur gear 46. Further, as described above, the rotor 27 of the motor 20 rotates once with 500 pulses. Note that the gear ratio of the gear train 40 is set so that the sprocket 30 rotates the rotor 27 of the motor 20 once or more when the tooth 31 is fed one tooth. In this embodiment, when the rotor 27 of the motor 20 rotates once, the teeth 31 of the sprocket 30 are fed one tooth. The sprocket 30 has, for example, 30 teeth 31, and each tooth 31 is set with an address for the control board 11 to identify each tooth 31 (see FIG. 9). Further, the tooth specifying portion includes a tooth specifying means 50 for specifying the tooth 31 at a predetermined position A that fits into the feed hole of the tape 3 of the sprocket 30.

  As shown in FIGS. 4 and 5, the tooth specifying means 50 of the tooth specifying portion changes the density of the disc surface 51 of the disc rotating coaxially with the sprocket 30 as an index stepwise over 360 degrees and changes the amount of transmitted light. A step change index 52 is provided, and a light emitting element 53 and a light receiving element 54 provided with the disk surface 51 interposed therebetween are provided. Further, each tooth and the transmitted light amount are associated with each other so that the tooth 31 at a predetermined position can be specified based on the transmitted light amount data detected by the light receiving element 54. Known elements can be used for the light emitting element 53 and the light receiving element 54, or a transmissive photosensor may be used. In order to change the transmitted light amount stepwise, instead of changing the index density stepwise, the thickness of the disk surface 51 may be changed stepwise to change the transmitted light amount.

  Then, by detecting the amount of transmitted light with the light receiving element 54, the control board 11 can identify which tooth 31 is present at the predetermined position A. The step change index 52 only needs to change the amount of transmitted light detected by the light receiving element 54 stepwise as the density changes stepwise. Further, the number of stages of change can be arbitrarily selected as long as it is equal to or greater than the number of teeth of the sprocket 30. However, the number of stages of change and the number of teeth of the sprocket 30 may be the same and correspond to each other in a one-to-one relationship. If the correspondence is made in a one-to-one relationship, the teeth of the sprocket 30 can be easily identified. Even when the sprocket 30 is in a position close to the intermediate point between the tooth 31 and the next tooth 31, one of the teeth 31 is always specified as being in the predetermined position A. As will be described later, the identification of the tooth 31 at the predetermined position A is only used to know the number of pulses of the motor 20 required to rotate from the identified tooth 31 to the next tooth 31. This is because it is not necessary to identify the exact stop position of the tooth 31.

  As shown in FIG. 1, the control board 11 stores a program for controlling the operation of the motor 20. As the stored program, the next address from the address where the teeth 31 of the sprocket 30 are located. A first pulse number indicating the rotation amount of the motor 20 for rotating the motor 20 and a second pulse number indicating the rotation amount of the motor 20 up to the home position corresponding to the address where the tooth 31 of the sprocket 30 is located. And a motor rotation control unit 13 for controlling the rotation of the rotor 27 of the motor 20 are provided.

  As shown in FIG. 9, the storage unit 12 stores the rotation amount of the rotor 27 of the motor 20 when the tooth 31 of the predetermined position A is sent to the next tooth 31 for each address of the tooth 31 of the sprocket 30. Yes. By the way, as described above, the rotor 27 of the motor 20 is configured to rotate once in response to a signal of 500 pulses. Therefore, the motor 20 when the tooth 31 at the predetermined position A is originally sent to the next tooth 31 is used. The rotation amount of the rotor 27 should be all equal at 500 pulses. However, if the teeth 31 are simply fed one by one by one rotation of the rotor 27 of the motor 20 due to the dimensional error of the sprocket 30 and the gear train 40 and the influence of backlash, the teeth for the component take-out portion 4 (see FIG. 1). The problem that the stop position of 31 will shift | deviate slightly will generate | occur | produce, and the problem that the precision of the stop position of the tooth | gear 31 will fall will generate | occur | produce. In particular, since the electronic components have been downsized in recent years, if the accuracy of the stop position of the teeth 31 is low, there arises a problem that the electronic components held by the tape 3 cannot be adsorbed well.

  Therefore, in the present invention, in order to increase the accuracy of the stop position of the tooth 31, the stop position of the tooth 31 is slightly changed for each tooth 31. Is stored as the first pulse number. Then, the motor rotation control unit 13 outputs a signal of the pulse number of the map M corresponding to the address of the tooth 31 specified by the tooth specifying means 50 to the motor 20 to rotate the rotor 27 by the predetermined pulse number. .

  Similarly, since the tooth 31 and the origin position corresponding to the tooth 31 are not necessarily constant, the second information on the rotation amount of the rotor 27 of the motor 20 up to the origin position is stored in the storage unit 12 in advance. Is stored as the number of pulses. As a result, as will be described later, each tooth 31 of the sprocket 30 can be stopped at an accurate position without using an absolute encoder.

  As shown in FIG. 4, the gear train 40 includes a sixth spur gear 46 coaxial with the sprocket 30 and a fifth spur gear 45 meshing with the sixth spur gear 46. 50 is provided on the shaft of the sprocket 30. Thus, in the tape feeder 1 of the present embodiment, since the tooth specifying means 50 is provided on the shaft of the sprocket 30, the configuration can be simplified as compared with the case where the tooth specifying means 50 is provided on the gear.

Next, an initial setting operation when the tape feeder 1 is turned on will be described.
First, when the tape feeder 1 is turned on, immediately after that, the tooth specifying means 50 of the tooth specifying unit specifies the address of the tooth 31 at the predetermined position A. Even when the sprocket 30 is in a position close to the intermediate point between the tooth 31 and the next tooth 31, one of the teeth 31 is always specified as being in the predetermined position A. Thereafter, the motor rotation control unit 13 drives the motor 20 to send the teeth 31 of the sprocket 30. At this time, the origin specifying hole element 23 outputs a signal corresponding to the detected magnetic field to the control board 11, and the control board 11 specifies the origin position of the motor 20. When the tooth specifying means 50 recognizes that the next tooth 31 has reached the predetermined position A before detecting the origin position of the motor 20, the address of the recognized next tooth 31 is used as a reference. Next, specify the origin position.

  Thereafter, the motor rotation control unit 13 corresponds to the first pulse number of the map M corresponding to the next address of the tooth 31 specified by the tooth specifying means 50 and the tooth 31 specified by the tooth specifying means 50 to the origin position. Referring to the second number of pulses in map M, rotor 27 of motor 20 is rotated and stopped by a predetermined number of pulses from the origin position. That is, a pulse obtained by reducing the second pulse number from the tooth 31 specified by the tooth specifying means 50 to the origin position from the first pulse number of the map M corresponding to the next address of the tooth 31 specified by the tooth specifying means 50. The rotor 27 of the motor 20 is rotated from the origin position by the number. Thus, after adjusting the stop position of the tooth 31 by the map M as an initial setting, the electronic component is sucked from the tape 3 by the head unit of the surface mounter. When the control board 11 receives a motor rotation signal for rotating the rotor 27 of the motor 20 from the surface mounter, the control board 11 again specifies the tooth 31 address, the origin position, and the rotation of the rotor 27 from the origin position. repeat.

  The initial setting adjustment method will be described in detail below. For example, as shown in FIG. 9, assuming that the address of the tooth 31 specified by the tooth specifying means 50 immediately after the power is turned on is the address 2, the motor rotation control unit 13 rotates the rotor 27 of the motor 20 to move the tooth 31. Send one pitch. Then, the origin position is specified by the origin specifying hole element 23. After the origin position is specified, the motor rotation control unit 13 rotates the rotor 27 of the motor 20 from the origin position with reference to the 503 pulse corresponding to the third address. However, when the tooth 31 is rotated from the second address to the third address, 100 pulses of the motor pulse number required to rotate from the second address to the origin position are reduced from 503 pulses. As a result, the rotor 27 of the motor 20 is rotated by 403 pulses from the origin position. If it does so, the tooth | gear 31 of the 3rd address will stop at a predetermined position correctly.

  In addition, when the origin position is not specified while the tooth 31 is sent from the second address to the third address by one pitch, the rotor 27 of the motor 20 is continuously rotated to set the tooth 31 to 1 with reference to the third tooth 31. Try to send the pitch. In this case, the motor rotation control unit 13 rotates the rotor 27 of the motor 20 from the origin position with reference to 510 pulses corresponding to address 4. However, when the tooth 31 is rotated from the third address to the fourth address, the motor pulse number 103 required to rotate from the third address to the home position is reduced from 510 pulses. As a result, the rotor 27 of the motor 20 is rotated by 407 pulses from the origin position. If it does so, the tooth | gear 31 of a 4th address will stop at a predetermined position correctly.

  In the tape feeder 1 operating as described above, the teeth 31 of the sprocket 30 are fed by the rotation of the rotor 27 of the motor 20 by the gear train 40, and the rotation of the rotor 27 of the motor 20 is decelerated by the gear train 40 to the sprocket 30. Communicated. Therefore, the rotor 27 of the motor 20 is rotated by the amount of rotation corresponding to the tooth 31 of the sprocket 30 stored in the map M, and this rotation is decelerated by the gear train 40, whereby the stop position of the tooth 31 of the sprocket 30 is set. Fine adjustment is possible. Therefore, the accuracy of the stop position of the tooth 31 can be increased. Further, the map M in the storage unit 12 indicates that the rotation amount of the rotor 27 of the motor 20 when the tooth 31 is sent to the next tooth 31 and the rotor 27 of the motor 20 up to the origin position for each address of the tooth 31 of the sprocket 30. Is stored in advance. As described above, the storage unit 12 stores in advance the rotation amount of the rotor 27 of the motor 20 in consideration of dimensional errors of the sprocket 30 and the gear train 40 and backlash for each tooth 31.

  Therefore, after the tooth identification means 50 identifies the address of the tooth 31 at the predetermined position A and rotates the rotor 27 of the motor 20 to identify the origin position, the motor rotation control unit 13 identifies the tooth identification means 50. The rotor 27 of the motor 20 is rotated from the origin position with reference to the first pulse number corresponding to the next address of the address and the second pulse number up to the origin position. Thus, by rotating the rotor 27 of the motor 20 by the number of pulses corresponding to the next address from the origin position of the rotor 27 of the motor 20, it is possible to improve the accuracy of the stop position of the tooth 31. Therefore, if the tooth specifying means 50 can specify the address of the tooth 31 at the predetermined position A, the tooth 31 stops at an accurate position by rotating the rotor 27 of the motor 20 by the number of pulses corresponding to the next address from the origin position. Therefore, the accuracy of the stop position of the tooth 31 can be increased without increasing the resolution of the tooth specifying means 50.

  Even after the initial setting is completed, the tooth specifying unit 50 of the tooth specifying unit specifies the address of the next tooth 31 that has reached the predetermined position A, and the rotor 27 of the motor 20 is rotated to specify the origin position. Later, the motor rotation control unit 13 refers to the first pulse number corresponding to the address next to the address specified by the tooth specifying means 50 and the second pulse number up to the origin position from the origin position to the rotor of the motor 20. 27 is rotated. Since the tooth 31 is identified and the origin position is detected each time it is sent to the next tooth 31 and the rotor 27 of the motor 20 is rotated by a predetermined number of pulses, the tooth 31 is stopped at a predetermined position very accurately. It will be possible.

  That is, since the tape feeder 1 rotates the rotor 27 of the motor 20 by the rotation amount stored in advance in the map M to increase the accuracy of the stop position of the tooth 31, it is necessary to increase the resolution of the tooth specifying means 50. There is no problem of increasing the size of the apparatus when an optical absolute encoder is used, and difficulty in control when a magnetic absolute encoder is used. Therefore, in the tape feeder 1, it is possible to avoid an increase in the size of the apparatus and facilitate accurate control.

  Further, the tooth 31 at the predetermined position A can be specified in the stop state immediately after the power is turned on, and the stop position of the tooth 31 can be adjusted separately from the normal operation of the tape feeder 1 at the initial setting. The operation for adjusting the position can be prevented from affecting the normal operation of the tape feeder 1.

  In the above embodiment, an example is shown in which the step change index 52 is provided on the disk surface 51 so that the amount of transmitted light changes as the density changes stepwise, and the light emitting element 53 and the light receiving element 54 are provided across the disk surface 51. However, an indicator for changing the amount of reflected light by changing the density stepwise may be provided on the disk surface, and the light emitting element and the light receiving element may be provided facing the disk surface on which the index is provided. In this case, a reflective photosensor can also be used. Since the light emitting element and the light receiving element can be provided on the same side, the apparatus can be miniaturized.

  An example in which a light emitting element and a light receiving element are provided on the tooth specifying portion with a disk surface provided with an index in which the line width continuously changes over 360 degrees to change the amount of transmitted light is shown in FIGS. This will be explained based on. Only the configuration different from the first embodiment will be described below.

  As shown in FIGS. 6 and 7, the tooth specifying means 150 of the tooth specifying portion continuously changes the line width over 360 degrees as an index on the disk surface 151 of the disk rotating coaxially with the sprocket 30, and the transmitted light amount is increased. A continuous change index 152 that changes is provided, and a light emitting element 153 and a light receiving element 154 provided with the disk surface 151 interposed therebetween are provided. Further, each tooth is associated with the transmitted light amount data so that the tooth at a predetermined position can be identified based on the transmitted light amount detected by the light receiving element 154. Known elements can be used for the light emitting element 153 and the light receiving element 154, and a transmissive photosensor may be used. The amount of change in the line width of the continuous change index 152 can be arbitrarily selected.

  In the above embodiment, an example in which the continuous change index 152 in which the line width continuously changes and the transmitted light amount changes is provided on the disk surface 151 and the light emitting element 153 and the light receiving element 154 are provided with the disk surface 151 interposed therebetween. Although shown, an indicator for changing the amount of reflected light by changing the line width continuously on the disc surface may be provided, and the light emitting element and the light receiving element may be provided facing the disc surface on which the indicator is provided. In this case, a reflective photosensor can also be used. Since the light emitting element and the light receiving element can be provided on the same side, the apparatus can be miniaturized.

Next, an example in which the index is read by the image sensor will be described (the drawing is omitted). Only configurations different from the first embodiment and the second embodiment will be described.
On the disk surface, an index that can be read by the image sensor is provided, and an image sensor for reading the index is provided. The index may be either the shape continuously changing over 360 degrees or the shape changing intermittently over 360 degrees. As long as the tooth 31 at the predetermined position A of the sprocket 30 can be identified as a result of reading the index with the image sensor, any shape may be used.

An example in which a cylinder is used instead of a disk in the tooth specifying means of the second embodiment will be described with reference to FIG. Only the configuration different from the first and second embodiments will be described.
As shown in FIG. 8, the index is provided on the cylinder 55 instead of the disk. A continuous change index 57 in which the line width continuously changes over 360 degrees and the amount of transmitted light changes is provided on the cylindrical surface 56 of the cylinder 55. And the light emitting element and light receiving element (not shown) provided on both sides of this cylinder part surrounding surface 56 are provided. In addition, the cylinder part surrounding surface 56 which provides the continuous change parameter | index 57 may be an inner peripheral surface other than the outer peripheral surface shown in figure. Further, the size of the cylinder 55 can be arbitrarily selected.

  Instead of the continuous change index 57 in which the line width continuously changes and the transmitted light quantity changes, the step change index in which the density changes stepwise over 360 degrees as in the first embodiment. 52 may be sufficient. It is also possible to provide a light emitting element and a light receiving element on the same side by using a reflective index. When a reflective index is provided on the inner peripheral surface of the cylindrical portion, the light emitting element and the light receiving element are also accommodated in the cylinder 55, and no extra elements are arranged outside the cylinder 55, so that the apparatus can be miniaturized. Further, as in the third embodiment, an index that can be read by the image sensor may be provided.

An example in which the tooth specifying means is provided not on the same axis as the sprocket but on the same axis as the other gears of the gear portion will be described (the drawing is omitted). Only the configuration different from the first and second embodiments will be described.
In this case, the gear provided with the tooth specifying means needs to rotate at the same angular velocity as the sprocket. Note that the rotation direction of the gear provided with the sprocket and the tooth specifying means may be reversed. In this way, the tooth specifying means 50 can be separated from the sprocket 30, the thickness of the structure around the sprocket 30 can be suppressed, and the structure around the sprocket 30 can be simplified.

  The present invention is not limited to the above-described embodiments, and various modifications as described below are possible without departing from the gist of the present invention.

  After adjusting the stop position of the tooth 31 at the predetermined position A as an initial setting, the electronic component is sucked from the tape 3 and then the control board 11 receives the motor rotation signal from the surface mounter. The reception timing of the motor rotation signal may be any time as long as the tooth specifying means 50 specifies the tooth 31 immediately after the power is turned on.

  In the above, the identification of the tooth 31 by the tooth identification means 50 of the tooth identification unit, the rotation of the rotor 27 of the motor 20 and the origin position, and the rotation of the rotor 27 of the motor 20 by a predetermined number of pulses from the origin position The process in which is repeated has been described. However, the identification of the address and the identification of the origin position may be performed only at the first execution immediately after the power is turned on, and may not be performed after the second time. As described above, even if the address and the origin position are not specified after the second time, the address is incremented by 1. Therefore, the motor rotation control unit 13 determines the motor 20 based on the number of pulses of the map M. If the rotor 27 is sequentially rotated, the teeth 31 can be stopped at an accurate stop position.

  As shown in FIG. 2, the motor 20 includes the optical encoder 21 having an encoder function and the origin specifying hole element 23 for specifying the origin. However, the optical encoder 21 has the origin specifying function. In this case, the origin specifying hole element 23 can be omitted. Further, the wheel element group 22 may have an encoder function for detecting the rotational position of the rotor 27 of the motor 20. In this case, the optical encoder 21 can be omitted. The encoder function may be realized by a magnetic encoder or an optical encoder.

  In the above embodiment, the rotor 27 of the motor 20 makes one revolution with 500 pulses, but the number of pulses necessary for the rotor 27 of the motor 20 to make one revolution is not limited to the above. Although the number of teeth 31 of the sprocket 30 is 30, the number of teeth 31 of the sprocket 30 is not limited to the above. Further, in the above embodiment, the teeth 31 are fed one by one by one rotation of the rotor 27. However, the amount of rotation of the rotor when the teeth are fed one by one, for example, the teeth are fed one by one by two rotations of the rotor. Is not limited to the above. Moreover, in the said Example, although the tooth | gear 31 was sent one tooth at a time, the unit which sends a tooth | gear, such as sending 0.5 tooth | gear by one rotation of a rotor, is not limited to the above.

  The tooth specifying means 50 specifies the tooth 31 at the predetermined position A where it is fitted into the feed hole of the tape 3, but the tooth 31 at another position may be specified.

  Although six gears are provided in the gear train, the number of gears can be appropriately changed according to the gear ratio to be set.

  Although the storage unit 12 and the motor rotation control unit 13 are provided on the same control board 11, they may be provided on separate control boards.

DESCRIPTION OF SYMBOLS 1 Tape feeder 3 Tape 11 Control board 12 Memory | storage part 13 Motor rotation control part 20 Pulse motor (motor)
23 Hole element for origin identification (origin identification section)
30 Sprocket 31 Teeth 40 Gear train (gear part)
46 6th spur gear 50 Tooth specifying means 51 Disc surface 52 Step change index 53 Light emitting element 54 Light receiving element 55 Cylinder 56 Cylindrical surface 57 Continuous change index 150 Tooth specifying means 151 Continuous change index 152 Disk surface 153 Light emission Element 154 Light receiving element A Predetermined position M Map

Claims (5)

The sprocket is rotated by transmitting the rotation of the motor to the sprocket through the gear portion, and the tape feed holes provided at predetermined intervals on the tape holding the parts are fitted to the teeth of the sprocket. In the tape feeder that transports the parts by moving the tape as the sprocket rotates,
An origin specifying unit that specifies a predetermined specific position in one rotation of the motor as an origin position;
For each tooth of the sprocket that is sent by the rotation of the motor by the gear unit, the amount of rotation of the motor when the tooth is sent to the next tooth and the amount of rotation of the motor to the origin position A storage unit for storing;
A tooth specifying part for specifying the teeth of the sprocket at a predetermined position;
With
The tooth specifying part is arranged on the disk surface of the disk or the cylindrical cylindrical surface of the cylinder provided coaxially with the sprocket or coaxially with the gear of the gear part rotating at the same angular velocity as the sprocket. The tape feeder according to claim 1, wherein an index is provided for changing data depending on a reading position when the cylindrical surface is optically read.   The tooth specifying part includes an index in which the concentration or line width changes stepwise or continuously, and the disk surface or the cylinder part peripheral surface provided with the index, or the disk surface or the cylinder part peripheral surface The tape feeder according to claim 1, further comprising a light emitting element and a light receiving element facing each other.   The tooth specifying part is an image sensor for imaging the index opposite to the index whose density or shape changes continuously or intermittently, and the disk surface or the cylindrical surface provided with the index. The tape feeder according to claim 1, comprising:   The tape feeder according to any one of claims 1 to 3, wherein the reading data of the index of the tooth specifying portion and the teeth of the sprocket correspond in a one-to-one relationship. The sprocket is rotated by transmitting the rotation of the motor to the sprocket through the gear portion, and the tape feed holes provided at predetermined intervals on the tape holding the parts are fitted to the teeth of the sprocket. A control method of a tape feeder that transports the parts by moving the tape as the sprocket rotates,
The amount of rotation of the motor when it is sent to the next address corresponding to the address set for each tooth is stored as the first pulse number, and from the address set for each tooth in advance of one rotation of the motor Storing the amount of rotation of the motor up to a predetermined origin position as a second pulse number;
The tooth at the predetermined position of the sprocket is specified by reading data from an index whose data changes depending on the reading position,
After the motor is rotated and the origin position is specified, the number of pulses indicating the rotation amount of the motor is a pulse from the origin position to the next address based on the first pulse number and the second pulse number. A tape feeder control method characterized in that the rotation of the motor is stopped when the number is measured.

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