KR101618319B1 - Apparaus for decting tape location on transferring and method for compensating the same - Google Patents

Abstract

The present invention relates to a tape transporting position detecting sensor and a position correcting method therefor, and more particularly to a detecting sensor and a position correcting method by which a transporting position of a carrier tape transported by a transporting means such as a sprocket can be detected will be. The detection sensor includes a conveying means (12) capable of controlling the conveyance distance of the tape by controlling the rotation by the operation of the driving means; A self-generating unit (122) arranged in the conveying unit (12) and rotating together with the conveying unit; A magnetic sensor 111 for detecting a magnetic field generated by the self-generating unit 122 and determining the position of the conveying unit 12; And a rotation detection sensor 112 for detecting the position of the conveying means 12 corresponding to the position determined by the magnetic sensor 111. [

Description

TECHNICAL FIELD [0001] The present invention relates to a tape transporting position detecting sensor and a position correcting method using the same.

The present invention relates to a tape transporting position detecting sensor and a position correcting method therefor, and more particularly to a detecting sensor and a position correcting method by which a transporting position of a carrier tape transported by a transporting means such as a sprocket can be detected will be.

The electronic component or label may be transferred to a position that is continuously determined by the tape serving as the base substrate. The transferred electronic component or label may then be placed or attached to the device or module by a pick-up device.

A device that picks up a plurality of electronic components and mounts them on a predetermined position of a printed circuit board (PCB) is called a surface mounting device (SMD). A carrier tape supply device or a feeder for feeding a carrier tape may be used for supplying parts to a printed circuit board in a surface mount device. Various types of feeders are known in the art and generally include an input module for input of a carrier tape having parts, a component exposure module for separating the cover tape from the inserted carrier tape and exposing the components, and a separate cover tape and empty pockets And a discharge module for discharging the base tape.

The tape containing the electronic component can be transported by the roller or the sprocket and the transport of the tape needs to be controlled so that the electronic component can be picked up at a predetermined position.

As a prior art relating to the supply of carrier tapes, Patent Document No. 2002-0047860 entitled " Tape Feeder for Component Mounting Apparatus " The prior art includes a frame; A carrier tape conveying means provided rotatably on one side of the frame and having a sprocket for intermittently conveying the carrier tape; A top cover discharging means provided on the other side of the frame for discharging a top cover which is peeled off from the carrier tape, the top cover discharging means having a pair of discharging gears with a top cover sandwiched therebetween; And a drive means for simultaneously driving at least one of the pair of discharge gears. The carrier tape transporting means further includes reverse rotation preventing means for preventing reverse rotation of the sprocket And the driving means includes a transfer worm hole coaxially disposed with the sprocket, a transfer worm gear engaged with the transfer worm hole, and a second worm gear cooperating with the first roller coaxially installed on one side of the discharge gear, A discharge wormhole coaxially installed with the second roller, a discharge worm gear engaged with the discharge wormhole, and a drive motor for driving the transfer worm gear and the discharge worm gear at the same time And a tape feeder for a component mounting machine. And rotation angle sensing means for sensing a rotation angle of the sprocket rotated by the driving means.

Another prior art related to the supply of a carrier tape is disclosed in Patent Registration No. 1232134 'A tape feeder for quickly detecting the position of a blank part and discharging the carrier tape'. The prior art includes a tape loading portion to which a carrier tape is loaded, a drive sprocket that is sequentially disposed along a conveyance path of the carrier tape for conveying the carrier tape supplied from the tape loading portion, A component pickup portion for exposing the component so that the component can be picked up from the carrier tape transported by the driving portion, a sensing portion for sensing the component or the transport hole of the carrier tape, and a component And a control section for controlling the rotation of the first drive sprocket and / or the second drive sprocket so that the carrier tape passes through the part pickup section at a speed higher than the feed speed necessary for picking up the component when the monitoring signal is inputted Detects the position and inserts the carrier tape. As it disclosed with respect to the tape feeder to discharge.

Prior art or known tape transport devices disclose techniques for detecting the position of a sprocket to detect the transport position of the tape or for detecting the presence of a component to adjust the tape transport speed. However, it does not disclose a technology for accurately detecting the transfer position of the tape and accordingly controlling the rotation level of the drive motor. For example, a device such as a sprocket for transporting a tape may be engaged with a device such as a gear and a transfer error may occur between rotation of the sprocket and other power transmission means due to processing errors or backlash. Such an error may cause accumulation of the transfer error of the tape, and the component may not be accurately transferred to the pickup position by simply controlling the rotation angle of the drive motor. The prior art does not disclose a method that can compensate for such transport errors that may occur during the transport of the tape.

The present invention has been made to solve the problems of the prior art and has the following purpose.

It is an object of the present invention to provide a tape transport position detection sensor capable of detecting a pitch corresponding to a predetermined transport position having a predetermined compensation value for each pitch of the transport means and a method for correcting the position by the tape transport position detection sensor.

According to a preferred embodiment of the present invention, the position detection sensor for detecting the tape feeding position is provided with the feeding means, the rotation of which is controlled by the operation of the driving means, so as to control the feeding distance of the tape. A self-generating unit disposed in the conveying unit and rotated together with the conveying unit; A magnetic sensor for detecting a magnetic field generated in the self-generating unit and determining a position of the conveying unit; And a rotation detection sensor for detecting a position of the conveying means corresponding to the position determined by the magnetic sensor.

According to another preferred embodiment of the present invention, the conveying means becomes a sprocket and the magnetism generating unit becomes a magnet disposed along the circumferential surface of the sprocket.

According to another preferred embodiment of the present invention, the transporting means has a plurality of successive pitches for transporting the tape, each of the plurality of pitches being detected by the magnetic sensor, and each of the plurality of pitches The error is predetermined.

According to another preferred embodiment of the present invention, the position correction method further comprises: determining and storing a correction value for each pitch of the transfer means; Detecting respective pitches by different magnetic fields corresponding to the respective pitches; Determining a pitch corresponding to a component exposed position of the tape by detecting a magnetic field for each of the pitches; And correcting the transfer distance with the stored correction value for the corresponding pitch.

According to another preferred embodiment of the present invention, the tape is a carrier tape for transporting an electronic component to a pickup position, and the transporting means is a sprocket.

According to yet another preferred embodiment of the present invention, a method for correcting a transfer position of a tape comprises: determining a correction value for successive pitches for transferring the tape; The tape being transported by the continuous pitch; Determining a transfer position of a predetermined portion of the tape; Detecting a pitch corresponding to the transfer position; And applying the correction value to the detected pitch.

The position detection sensor according to the present invention has an advantage that the component pickup error is prevented by compensating the transport distance of the pitch corresponding to the component exposure position by a predetermined compensation value. In addition, the correction method according to the present invention has an advantage in that the component stored in the tape can be accurately transported to a predetermined position by detecting the transport error of the tape caused by various causes and controlling the operation of the drive motor. In addition, the calibration method according to the present invention has the advantage that the operating characteristics of the feeding device can be analyzed by continuously detecting the cumulative error generated in the feeding device. Further, the correction method according to the present invention has an advantage that it can be applied to various tape transporting apparatuses.

FIG. 1A shows an embodiment in which a position detection sensor according to the present invention is applied.
FIG. 1B shows an embodiment of a position detection sensor according to the present invention.
2 shows an embodiment of a tape feeding apparatus to which position detection according to the present invention is applied.
3A is a block diagram schematically illustrating an embodiment of a position correction method according to the present invention.
FIG. 3B illustrates an exemplary process of the position correction method according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto. In the following description, components having the same reference numerals in different drawings have similar functions, so that they will not be described repeatedly unless necessary for an understanding of the invention, and the known components will be briefly described or omitted. However, It should not be understood as being excluded from the embodiment of Fig.

In the following, the present invention will be described by showing an embodiment of a carrier tape supply device for transferring a carrier tape accommodated with an electronic component to a pickup position. However, a detection sensor according to the present invention can be applied to detect the transporting position of the tape for transporting various kinds of parts or labels, and the present invention is not limited to the embodiments shown. The tape can be continuously transported and the transport distance can be controlled. For example, a transfer hole may be formed in the tape and the transfer hole may be engaged with the teeth of the rotation transfer means such as a sprocket. The horizontal traversing distance between the teeth is predetermined and the rotation of the conveying means can be controlled by a driving means such as, for example, a BLDC motor. The position of the tape currently engaged with the transport means can be sensed and the current position of the tape can be detected. The distance between the pickup position and the current position of the component or label is determined and the tape can be positioned at the predetermined pickup position by the operation control of the drive means. And parts or labels can be picked up. The transfer of the tape by the transfer means is set so that the part or label is positioned at the pick-up position. However, due to various causes such as machining errors, an error may occur in the pitch or transfer distance between the respective teeth of the transfer means. Thus, an error may occur depending on the pitch corresponding to the pick-up position. According to the present invention, such an error is determined in advance and stored, and a pitch corresponding to the pickup position can be detected. And the detected pitch can be compensated to correspond to a predetermined error.

A detection sensor that enables such compensation is described below.

FIG. 1A shows an embodiment in which a position detection sensor according to the present invention is applied, and FIG. 1B shows an embodiment of a position detection sensor according to the present invention.

Referring to FIGS. 1A and 1B, a position detection sensor according to the present invention includes conveying means 12, which is controlled in rotation by the operation of a driving means to control a conveying distance of the tape. A self-generating unit (122) arranged in the conveying unit (12) and rotating together with the conveying unit; A magnetic sensor 111 for detecting a magnetic field generated by the self-generating unit 122 and determining the position of the conveying unit 12; And a rotation detection sensor 112 for detecting the position of the conveying means 12 corresponding to the position determined by the magnetic sensor 111. [

The tape may be composed of, for example, a base tape having pockets in which the electronic components are received and a cover tape attached to the top of the base tape to protect the electronic components. The tape may be transported by a rotating roller or sprocket operated by a motor, and a transport hole may be formed in the tape for transportation by the sprocket. The teeth of the sprocket corresponding to the transfer means 12 can be engaged with the transfer hole of the tape and the transfer distance of the tape can be calculated by measuring the rotation angle of the sprocket.

The tape may be conveyed through a tape guide 13 corresponding to a feeding device or a conveying device, and the conveying device 12 may form a part of the feeding device. The tape guide 13 includes a separation start portion 131 in which the separation of the cover tape is started, a separation inducing portion 132 in which the cover tape starts to separate, and an electronic part accommodated in the pocket of the base tape by separation of the cover tape, And a pickup part 133 for picking up the electronic parts.

The tape can be conveyed to the pick-up part 133 by a conveying means 12 such as a sprocket and the conveying means 12 can be rotated by a power transmitting means 14 such as a gear rotated by a drive motor. The drive motor may be, for example, but not limited to, a BLDC (blushless DC) motor.

The rotation of the drive motor can be controlled by the control module, and the rotation angle of the transfer means 12 can be controlled by the rotation control of the drive motor, whereby the transfer distance of the tape can be controlled. If the mechanical error or the operation error is not generated, the rotation angle of the motor coincides with the rotation angle of the transfer means 12, and the transfer distance of the tape is accurately calculated, and the electronic part accommodated in the base tape is accurately positioned in the pick- Can be controlled. Mechanical errors include, for example, the backlash of gears, machining errors, shaft errors, or any misalignment that occurs during the manufacturing or connection of different parts or machines, such as misalignment of the transfer hole and teeth. And the operating error includes the operating time and the calculation error during the operation of the machine.

A mechanical error or an operation error may occur for various reasons, and such an error may directly or cumulatively cause an error between the rotation angle of the drive motor and the tape transport distance. Such an error can be corrected by resetting the reference of the tape feeding distance or by changing the setting of the entire feeding device. For this purpose, it is necessary to measure the error value accurately and if necessary, the cause of the error is searched and it is necessary to determine whether the error is a characteristic inherent to the machine or an error depending on the operation. According to the present invention, the error can be measured by the magnetic sensor 111 and the rotation detection sensor 112, and the error cause can be investigated by analyzing the measured error.

The magnetic sensor 111 may be a detection means capable of measuring the rotation angle of the conveying means 12 with respect to the reference position or detecting a predetermined position of the conveying means 12 and may be a detecting means such as a gauss meter or a hall sensor . The rotation angle or the predetermined position of the conveying means 12 can be detected by the magnetic sensor 111. [

The rotation detection sensor 112 is capable of detecting a specific part of the conveying means 12 and is capable of detecting, for example, teeth in a predetermined position of the sprocket. The rotation detection sensor 112 may be any means capable of detecting the conveying means 12 but is not necessarily a sensor capable of measuring the rotation angle or the rotation speed of the conveying means 12. [ The rotation detection sensor 112 corresponds to a sensor for detecting that a specific portion of the conveying means 12 passes through the rotation detection sensor 112. [ Specifically, any sensor capable of detecting a predetermined position of the conveying means 12 detected by the magnetic sensor 111, and can be, for example, a photosensor.

According to the present invention, the predetermined position of the conveying means 12 detected by the magnetic sensor 111 by the magnetic sensor 111 and the rotation detecting sensor 112 can be determined. The predetermined position may be, for example, the position of the conveying means 12 corresponding to the part pickup position.

The transfer means 12 may be a rotator and includes a magnetism generating unit 122 that forms a concentric circle with the shaft connecting portion 121 and the shaft connecting portion 121, A reference pitch unit 123 and an engaging unit 124 as a direct means of moving the tape. The axis connection portion 121 may have a hole shape that can be coupled to a shaft fixed to the frame and the magnetism generating unit 122 may have a circular shape having a different magnetic field at different angles from the center with respect to the reference position, It can be a magnet. The reference pitch unit 123 may be a tooth formed along the circumference, for example, formed to correspond to the pitch or unit transfer angle of the engaging unit 124, and the engaging unit 124 may be formed along the circumference engaging the transfer hole It can be a tooth formed at the same pitch. The reference pitch unit 123 can be a tooth formed along the circumferential direction at the same pitch as the engaging unit 124 and each tooth can be detected by the rotation detection sensor 112. [ Depending on the power transmission structure, the conveying means 12 may have a connecting unit 124a connected to a power transmitting means 14 connected to a driving motor such as a gear.

According to the present invention, the transport means 12 has a plurality of successive pitches for transporting the tape, each of the plurality of pitches being detected by a magnetic sensor 111, and for each of the plurality of pitches The error can be predetermined and stored.

A plurality of teeth or pitches formed in the sprocket and the transfer means 12 may have transfer errors due to various causes. Such a transfer error may cause an error in the transfer process of the tape to the pickup position. Such a transfer error or correction value for each of a plurality of teeth or pitches may be predetermined and stored by, for example, testing. And each pitch can be detected by the magnetic sensor 111 and the rotation detection sensor 112 and accordingly the transfer distance can be corrected by a predetermined error or correction value. For example, the pitch can be detected by the magnetic sensor 111 and the rotation detection sensor 112 if one component is picked up at the first pitch and the next component is picked up at the second pitch. And the second pitch is corrected according to the predetermined value, so that the part can be accurately transferred to the pickup position.

When the conveying means 12 is rotated, the magnetic sensor 111 provided in the fixed position is rotated at the same rotational speed as the conveying means 12 in the self-generating unit 122, Lt; / RTI > The magnetism generating unit 122 may be a circular magnet and have different magnetic fields at different positions and the magnetic sensor 122 may detect that a specific position of the transfer unit 12 passes through a predetermined point by detecting a magnetic field It can detect. The rotation of the transfer unit 12 causes the reference pitch unit 123 to rotate at the same rotational speed as the self generating unit 122 and to detect that the portion detected by the magnetic sensor 111 passes through a specific point have. The predetermined portion of the conveying means 12 is detected by the rotation detection sensor 112 and the magnetic sensor 111 detects the magnetic field of the pitch detected by the rotation detection sensor 112 by the magnetic sensor 111 . Whereby the position of each pitch in the conveying means 12 can be determined and the pitch corresponding to the pick-up position can be determined.

A driving means such as, for example, a BLDC motor can be engaged with the connecting unit 124a so that the conveying means 12 can be rotated. The rotational angle of the driving means can be predetermined or measurable and the rotational angle of the feeding means 12 can be determined according to the rotational angle of the driving means. However, the pitch corresponding to the pickup position is not determined. In this situation, the pitch of the conveying means 12 corresponding to the pick-up position can be determined by the magnetic sensor 111 and the rotation detecting sensor 112. [

The magnetic sensor 111 and the rotation detection sensor 112 can be attached to a detection board having a circuit board structure and the detection board can be fixed to a fixing means 113 such as a bracket fixed to a feeder or a frame of the transfer device, As shown in FIG. The position of the detection board is fixed and the magnetic sensor 111 and the rotation detection sensor 112 respectively detect that a specific part of the self generating unit 122 and the reference pitch unit 123 is the magnetic sensor 111 and the rotation detection sensor 112 ≪ / RTI > The detection board can transmit the detected value from the magnetic sensor 111 and the rotation detection sensor 112 to the control module and the control module can determine the pitch corresponding to the pickup position based on the detected value. Then, the travel distance can be corrected by the stored predetermined correction value. This allows the part to be accurately positioned at the pick-up position. The detection board or securing means 113 may have any structure known in the art and the invention is not limited to the embodiments shown.

An embodiment in which the detection sensor according to the present invention is applied will be described below.

FIG. 2 shows an embodiment of a tape supply apparatus 200 to which position detection according to the present invention is applied.

Referring to FIG. 2, the carrier tape accommodating the electronic parts may be inserted through the insertion module 201 and transferred to the tape guide 203 via the transfer module 202. The carrier tape may be transported by the first driving means 204 or the second driving means 205. [ The driving means 205 can be rotated by the driving means 205 so that the carrier tape is transported to the predetermined position of the tape guide 203 and the electronic part can be picked up at the above described pickup position.

The travel distance of the tape can be controlled by the rotation control of the drive motor and the predetermined position of the transport means can be detected by the magnetic sensor and the rotation detection sensor as described above. And the pitch corresponding to the pick-up position can be determined. The control module rotates the driving means 205 by applying a predetermined correction value, so that the travel distance can be corrected. Continuous error detection and correction can be used to detect the characteristics of the feeder as needed, and accordingly correction of the feeder settings can be made accordingly.

The following describes how to correct the rotation angle of the drive motor and the tape transport distance accordingly.

3A is a block diagram schematically illustrating an embodiment of a position correction method according to the present invention.

Referring to FIG. 3A, the transfer distance for each pitch in the transfer means can be measured and the error or compensation value can be determined. Such a measurement may be determined, for example, by direct transfer of the tape (S310). In this way, the transfer distance, error or compensation value for each pitch of the transfer means can be determined and the determined value can be stored in the control module. The magnetic field corresponding to each pitch can be determined by a means such as a circular magnet, for example (S320). By detecting the magnetic field, the pitch can be specified and the compensation value according to the transfer distance can be determined.

The tape in which the component is accommodated can be transported by the operation of the transport means and the predetermined position of the transport means can be detected by the magnetic sensor and the rotation detection sensor described above and thus the pitch of the pickup position can be detected (S330) . Then, the control module operates the driving means by compensating the transfer distance by the stored predetermined compensation value, and accordingly, the tape can be transferred with the compensation value applied (S340). Whereby the parts can be positioned continuously and precisely at the pick-up position.

FIG. 3B illustrates an exemplary process of the position correction method according to the present invention.

Referring to FIG. 3B, the compensation value may be determined according to the method described above (S31). Then, the tape can be transferred by the operation of the transfer means (S32). The pitch can be detected by the magnetic sensor and the rotation detection sensor together with the operation of the conveying means (S33), and the pick-up pitch can be determined (S34). If the pickup pitch is determined, the compensation value may be determined and applied by the control module (S35). Through such a process, the parts can be continuously supplied to a predetermined pickup position.

New errors may occur for various reasons during the operation of the feeder. If the pickup is not picked up due to such an error, a pickup error may occur (NO). In this case, the stored reference data can be searched (S37). The reference data may be, for example, the sum of the number of revolutions of the conveying means or the compensation value for each pitch. Then, an accumulated error can be calculated on the basis of this (S38). The characteristic of the transfer device can be determined by applying the cumulative error (S39) and the determined characteristic can be applied to the determination of the compensation value (S31).

The correction method according to the present invention can be applied to various supply devices and the present invention is not limited to the embodiments shown.

The position detection sensor according to the present invention has an advantage that the component pickup error is prevented by compensating the transport distance of the pitch corresponding to the component exposure position by a predetermined compensation value. In addition, the correction method according to the present invention has an advantage in that the component stored in the tape can be accurately transported to a predetermined position by detecting the transport error of the tape caused by various causes and controlling the operation of the drive motor. In addition, the calibration method according to the present invention has the advantage that the operating characteristics of the feeding device can be analyzed by continuously detecting the cumulative error generated in the feeding device. Further, the correction method according to the present invention has an advantage that it can be applied to various tape transporting apparatuses.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention . The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

12: conveying means 13: tape guide
14: power transmission means 111: magnetic sensor
112: rotation detection sensor 113: fixing means
121: shaft connecting portion 122: self-generating unit
123: reference pitch unit 124: engaging unit
131: separation start portion 132: separation inducing portion
133: pickup part 200: tape feeding device
201: input module 202: transfer module
203: tape guide 204, 205: drive means
206: conveying means

Claims (6)

A position detection sensor for detecting a transfer position of a tape,
Conveying means (12) having an engaging unit (124) in which the rotation is controlled by the actuation of the driving means to control the conveying distance of the tape and the teeth are engaged with the conveying holes of the tape;
A magnetism generating unit 122 disposed in the transfer means 12 and rotating together with the transfer means 12 and having different magnetic fields at different angles;
A magnetic sensor 111 for detecting a magnetic field generated in the self-generating unit 122 and determining the position of the transfer means 12;
A reference pitch unit 123 formed along the circumferential surface of the self-generating unit 122; And
And a rotation detection sensor (112) capable of detecting a specific part of the conveying means (12)
Wherein the reference pitch unit (123) has teeth formed along the circumferential direction so as to have the same pitch as the pitch of the engaging unit (124) for transferring the tape. The position detection sensor according to claim 1, wherein the transfer means (12) is a sprocket, and the magnetism generating unit (122) is a circular magnet disposed along the circumferential surface of the sprocket.   An apparatus according to any one of the preceding claims, wherein the engaging unit (124) disposed on the transport means (12) has a plurality of successive pitches for transporting the tape, wherein a transport error or correction value for each of the pitches Wherein the sensor is pre-determined and stored. A method of correcting a transfer position of a carrier tape,
Determining and storing an error or a correction value with respect to a pitch of each of the transfer means by direct transfer of the tape;
A magnetic field corresponding to each of the pitches is determined, and a magnetic field is detected to specify a pitch;
The tape containing the component is transported by the transporting means and the predetermined position of the transporting means is detected by the magnetic field;
Detecting a pitch from a position detected by the magnetic field to a pick-up position; And
And an error or correction value for each of the pitches is applied to transfer the tape,
The pitch to the pick-up position is rotated at the same rotational speed as the conveying means, and the teeth of the reference pitch unit arranged along the circumferential surface of the self-generating unit have a pitch equal to the pitch of each of the conveying means, Wherein the detected position is detected by detecting an object.






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