Disclosure of Invention
An object of the present invention is to solve at least one of the above problems and disadvantages in the prior art.
According to an aspect of the present invention, there is provided a carrier tape transfer system including: a carrier tape supply reel for winding the carrier tape having no electronic component loaded in the hole thereof; a carrier tape receiving reel for winding the carrier tape having the electronic parts loaded in the cavities thereof; and a servo driving device for driving the carrier tape to be transferred from the carrier tape supply reel to the carrier tape receiving reel. When an empty cavity on the carrier tape is transferred to a predetermined loading position, electronic components are loaded into the cavity. The carrier tape transfer system further includes: a noncontact distance sensor disposed directly above a carrier tape being conveyed, for detecting a distance between the noncontact distance sensor and the carrier tape; a contour recognition device adapted to recognize a contour feature of the cavities on the carrier tape based on a relationship between a distance and time detected by the non-contact distance sensor; and a pitch calculation device for calculating an actual pitch between two adjacent holes according to the profile characteristics of the holes on the carrier tape recognized by the profile recognition device, wherein the servo drive device accurately conveys each hole on the carrier tape to a predetermined loading position according to the calculated actual pitch.
According to an exemplary embodiment of the present invention, at the edge of the cavity, the distance detected by the non-contact distance sensor changes in steps; the outline recognition device recognizes the edge characteristic of the hole according to the step change of the detected distance; the actual pitch between two adjacent holes is equal to the distance between the edge features of two adjacent holes identified.
According to another exemplary embodiment of the present invention, the pitch calculation means calculates the actual pitch between two adjacent holes based on the time when the edge feature of the two adjacent holes is recognized and the transport speed of the carrier tape.
According to another exemplary embodiment of the present invention, a change speed of the distance detected by the non-contact distance sensor at the corner of the cavity is changed in a step; the contour recognition device is suitable for recognizing the corner characteristic of the hole according to the step change of the change speed of the distance detected by the non-contact distance sensor; the actual pitch between two adjacent holes is equal to the distance between the corner features of two adjacent holes identified.
According to another exemplary embodiment of the present invention, the pitch calculation means calculates the actual pitch between two adjacent holes based on the time when the corner feature of the two adjacent holes is recognized and the transport speed of the carrier tape.
According to another exemplary embodiment of the present invention, the noncontact distance sensor is disposed upstream of the predetermined loading position in the transport direction of the carrier tape, and the noncontact distance sensor is spaced from the predetermined loading position in the transport direction of the carrier tape by a distance greater than a standard pitch between two adjacent cavities on the carrier tape to ensure that the contour features of the cavities have been identified before they reach the predetermined loading position.
According to another exemplary embodiment of the present invention, the contactless distance sensor is an infrared sensor, a laser sensor, an electromagnetic wave sensor or an ultrasonic sensor.
According to another exemplary embodiment of the present invention, the contour recognition means is adapted to recognize the entire cross-sectional contour of the cavities on the carrier tape based on a relationship between a distance detected by the non-contact distance sensor and time.
According to another exemplary embodiment of the present invention, the carrier tape transport system further comprises a carrier tape quality inspection device adapted to determine whether the quality of the holes on the carrier tape is acceptable according to an error between the cross-sectional profile of the identified holes and the cross-sectional profile of the pre-stored standard holes.
According to another exemplary embodiment of the present invention, the carrier tape quality inspection apparatus determines that the quality of the cavities on the carrier tape is not acceptable when an error between the cross-sectional profile of the identified cavities and the cross-sectional profile of the pre-stored standard cavities exceeds a predetermined threshold.
In the above-described respective exemplary embodiments according to the present invention, the carrier tape transfer system can calculate an actual pitch between adjacent two pockets of the carrier tape, which are not yet loaded with electronic devices, in real time on-line, and thus, the respective pockets of the carrier tape can be accurately transferred to a predetermined loading position according to the calculated actual pitch, improving the quality and efficiency of packaging the electronic devices into the pockets of the carrier tape.
Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the general inventive concept of the present invention and should not be construed as limiting the invention.
Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in schematic form in order to simplify the drawing.
According to one general technical concept of the present invention, there is provided a carrier tape transfer system, including: a carrier tape supply reel for winding the carrier tape having no electronic component loaded in the hole thereof; a carrier tape receiving reel for winding the carrier tape having the electronic parts loaded in the cavities thereof; and a servo driving device for driving the carrier tape to be transferred from the carrier tape supply reel to the carrier tape receiving reel. When an empty cavity on the carrier tape is transferred to a predetermined loading position, electronic components are loaded into the cavity. The carrier tape transfer system further includes: a noncontact distance sensor disposed directly above a carrier tape being conveyed, for detecting a distance between the noncontact distance sensor and the carrier tape; a contour recognition device adapted to recognize a contour feature of the cavities on the carrier tape based on a relationship between a distance and time detected by the non-contact distance sensor; and a pitch calculation device for calculating an actual pitch between two adjacent holes according to the profile characteristics of the holes on the carrier tape recognized by the profile recognition device, wherein the servo drive device accurately conveys each hole on the carrier tape to a predetermined loading position according to the calculated actual pitch.
Fig. 1 shows a schematic configuration diagram of a carrier tape transport system according to an exemplary embodiment of the present invention.
As shown in fig. 1, in the illustrated embodiment, the carrier tape transport system mainly includes: a carrier tape supply reel 1, a carrier tape receiving reel 2, and a servo drive device 5. The carrier tape supply reel 1 is used to wind the carrier tape 3, which has not been loaded with electronic parts in its holes 4. The carrier tape receiving reel 2 is used to wind the carrier tape 3 having electronic components loaded in its holes 4. The servo drive device 5 is used to drive the carrier tape 3 to be transferred from the carrier tape supply reel 1 to the carrier tape receiving reel 2.
As shown in fig. 1, in the illustrated embodiment, a predetermined loading position 7 is provided between the carrier tape supply reel 1 and the carrier tape receiving reel 2. When an empty pocket 4 on the carrier tape 3 is transferred to a predetermined loading position 7, the electronic component is loaded into the pocket 4.
FIG. 2 illustrates an embodiment of calculating the actual pitch between two adjacent cavities based on the profile characteristics of the identified cavities on the carrier tape.
As shown in fig. 1 and 2, in the illustrated embodiment, the carrier tape transport system further includes: a non-contact distance sensor 6, a contour recognition device (not shown, which may run on a computer) and a pitch calculation device (not shown, which may run on a computer). A noncontact distance sensor 6 is disposed directly above the carrier tape 3 being conveyed, for detecting the distance between the noncontact distance sensor 6 and the carrier tape 3. The contour recognition means are adapted to recognize the contour features of the holes 4 on the carrier tape 3 on the basis of the relationship between the distance and the time detected by the non-contact distance sensor 6. Pitch calculation means for calculating an actual pitch P between two adjacent cavities 4 based on the profile characteristics of the cavities 4 on the carrier tape 3 identified by the profile identification meansi。
As shown in fig. 1 and 2, in the illustrated embodiment, the servo drive 5 is based on the calculated actual pitch PiEach of the holes 4 on the carrier tape 3 is accurately transferred to a predetermined loading position 7.
As shown in fig. 1 and 2, in the illustrated embodiment, the distance detected by the non-contact distance sensor 6 changes in steps at the edge of the hole 4. The contour recognition means recognize the edge characteristics of the hole 4 from the detected step change in distance. The actual pitch P between two adjacent cavities 4iEqual to the edge of two adjacent holes 4 identifiedThe distance between features.
As shown in FIGS. 1 and 2, in the illustrated embodiment, the pitch calculation means is based on the time t at which the edge features of two adjacent holes 4 are identifiedi、ti+1And the conveying speed of the carrier tape 3 to calculate the actual pitch P between two adjacent holes 4i. For example, the time t shown in FIG. 2 can be setiAnd ti+1The time difference is multiplied by the conveying speed of the carrier tape 3 to obtain the actual pitch P between two adjacent holes 4i。
FIG. 3 illustrates another embodiment of calculating the actual pitch between two adjacent cavities based on the profile characteristics of the identified cavities on the carrier tape.
As shown in fig. 1 and 3, in the illustrated embodiment, the speed of change of the distance detected by the noncontact distance sensor 6 changes stepwise at the corners of the cavity 4. The contour recognition means are adapted to recognize corner features of the hole 4 from a step change in the speed of change of the distance detected by the non-contact distance sensor 6. The actual pitch P between two adjacent cavities 4iEqual to the distance between the corner features of two adjacent holes 4 identified.
As shown in FIGS. 1 and 3, in the illustrated embodiment, the pitch calculation means is based on the time t at which the corner features of two adjacent holes 4 are identifiedi、ti+1And the conveying speed of the carrier tape 3 to calculate the actual pitch P between two adjacent holes 4i. For example, the time t shown in FIG. 3 can be setiAnd ti+1The time difference is multiplied by the conveying speed of the carrier tape 3 to obtain the actual pitch P between two adjacent holes 4i。
As shown in fig. 1, in the illustrated embodiment, the noncontact distance sensor 6 is disposed upstream of the predetermined loading position 7 in the conveyance direction of the carrier tape 3, and the noncontact distance sensor 6 is spaced from the predetermined loading position 7 by a distance greater than a standard pitch P (e.g., greater than two, three, or more standard pitches P) between adjacent two cavities 4 on the carrier tape 3 in the conveyance direction of the carrier tape 3 to ensure that the contour features of the cavities 4 have been identified before they reach the predetermined loading position 7.
As shown in fig. 1, in the illustrated embodiment, the noncontact distance sensor 6 may be an infrared sensor, a laser sensor, an electromagnetic wave sensor, or an ultrasonic sensor.
As shown in fig. 2 and 3, in the illustrated embodiment, the profile recognition means is adapted to recognize the entire cross-sectional profile of the holes 4 in the carrier tape 3 on the basis of the relationship between the distance and time detected by the noncontact distance sensor 6.
Although not shown, in an exemplary embodiment of the present invention, the carrier tape transport system may further include a carrier tape quality detection device. The carrier tape quality detection device is adapted to determine whether the quality of the holes 4 on the carrier tape 3 is acceptable based on an error between the cross-sectional profile of the identified holes 4 and the cross-sectional profile of the pre-stored standard holes 4. When an error (for example, a dimension error or a shape error) between the cross-sectional profile of the identified cavity 4 and the cross-sectional profile of the cavity 4 of the pre-stored standard exceeds a predetermined threshold, the carrier tape quality inspection apparatus determines that the quality of the cavity 4 on the carrier tape 3 is not acceptable.
It will be appreciated by those skilled in the art that the embodiments described above are exemplary and can be modified by those skilled in the art, and that the structures described in the various embodiments can be freely combined without conflict in structure or principle.
Although the present invention has been described in connection with the accompanying drawings, the embodiments disclosed in the drawings are intended to be illustrative of preferred embodiments of the present invention and should not be construed as limiting the invention.
Although a few embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the appended claims and their equivalents.
It should be noted that the word "comprising" does not exclude other elements or steps, and the words "a" or "an" do not exclude a plurality. Furthermore, any reference signs in the claims shall not be construed as limiting the scope of the invention.