JP2005005289A - Electronic component mounter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic component mounter capable of ensuring the workability of a splicing work. <P>SOLUTION: In the electronic component mounter for taking out an electronic component from a tape feeder 4 arranged at a component feeding section 2 using a transfer head 8 and mounting them on a substrate 10, the remaining length of a carrier tape 7 contained in the tape feeder 4 while holding the electronic component is calculated from the residual number of components held at a section 13 for counting the residual number of components, the execution of a tape splicing work is noticed when the remaining tape length decreases to an alarm remaining tape length 12a stored at a data storage section 12 and the operation of the mounter is stopped when the remaining tape length decreases to a minimum tape length 12b. Consequently, splicing can be performed in a state that the tail of the tape exists in a desired range and good workability can be ensured. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic component mounting apparatus that takes out an electronic component from a tape feeder of a component supply unit and mounts the electronic component on a substrate.
[0002]
[Prior art]
As a method for supplying an electronic component to a transfer head in an electronic component mounting apparatus, a method using a tape feeder is known. In this method, a carrier tape that holds an electronic component is pulled out from a supply reel, and pitch-fed in synchronization with the mounting timing of the electronic component. When a part breakage occurs in the tape feeder during the mounting operation, a reel replacement operation for replacing the supply reel with a new one is performed.
[0003]
In recent years, a so-called splicing method for joining the carrier tape itself has been adopted for the reel replacement operation. According to this method, since the end portion of the already mounted carrier tape and the beginning portion of the new carrier tape are joined, the head for performing tape alignment by attaching the beginning portion of the new tape to the tape feeder. The dispensing work can be omitted. Thereby, there is an advantage that a dead time due to stopping the mounting apparatus every time when a component cut occurs can be saved.
[0004]
For this reason, in electronic component mounting devices that employ splicing, the number of remaining parts in each tape feeder is always managed, and a notification that a splicing operation is required at the timing when the number of remaining parts has decreased to a predetermined value is provided. There are many examples of doing so. By this advance notice, the machine operator prepares a new supply reel and executes splicing to connect the already mounted tape and the new carrier tape (see, for example, Patent Document 1).
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-341096
[Problems to be solved by the invention]
Since this splicing requires fine manual work to cut the end of the carrier tape at a predetermined position and then use an adhesive tape or the like, it is possible to perform this work with as much workability as possible at the work site. There is a strong demand for measures that can be done. However, in the conventional electronic component mounting apparatus, although the above-described notice is made, the end of the already mounted carrier tape is not always in a desirable position, and it is difficult to ensure the workability of splicing work. There was a point.
[0007]
Therefore, an object of the present invention is to provide an electronic component mounting apparatus that can ensure the workability of the splicing work.
[0008]
[Means for Solving the Problems]
The electronic component mounting apparatus according to claim 1 is an electronic component mounting apparatus that takes out an electronic component from a component supply unit by a transfer head and mounts the electronic component on a substrate, and is a carrier tape that is arranged in the component supply unit and holds the electronic component A tape feeder that feeds electronic components to the pick-up position by the transfer head by pitch-feeding, and a remaining tape length that indicates the remaining length of the carrier tape that is accommodated while holding the electronic components in this tape feeder is calculated And a remaining tape length calculating means.
[0009]
The electronic component mounting apparatus according to claim 2 is the electronic component mounting apparatus according to claim 1, wherein when the remaining tape length is reduced to a predetermined length specified in advance, an existing carrier tape is newly added in the tape feeder. Notices the splicing operation time when splicing work is required to splice the carrier tape supplied to the tape, and stops tape feeding in the tape feeder if the remaining tape length decreases to a preset lower limit length Thus, a splicing work execution ensuring means for ensuring that the splicing work is surely executed is provided.
[0010]
The electronic component mounting apparatus according to claim 3 is the electronic component mounting apparatus according to claim 1, wherein a seam detecting means for detecting a seam of the carrier tape on the front side of the pickup position, and a seam by the seam detecting means. And a remaining tape length resetting means for resetting the remaining tape length to an initial value based on a detection signal.
[0011]
According to the present invention, it is provided with the remaining tape length calculating means for calculating the remaining tape length indicating the remaining length of the carrier tape accommodated in the state where the electronic component is held, so that the end portion of the already-mounted tape is within the desired range. Splicing can be performed in a state of being inside, and good workability of the splicing work can be ensured.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. 1 is a sectional view of an electronic component mounting apparatus according to an embodiment of the present invention, FIG. 2 is a side view of a tape feeder according to an embodiment of the present invention, and FIG. 3 is a tape feeder according to an embodiment of the present invention. 4 is a side view of the pickup position, FIG. 4 is an explanatory view showing the remaining tape length in the tape feeder according to the embodiment of the present invention, and FIG. 5A is a partial plan view of the cover member of the tape feeder according to the embodiment of the present invention. FIGS. 5A and 5B are partial side views of a cover member of a tape feeder according to an embodiment of the present invention, and FIG. 6 is an explanation of tape splicing in the electronic component mounting apparatus according to the embodiment of the present invention. FIG. 7 is an explanatory diagram of joint detection in the electronic component mounting apparatus according to the embodiment of the present invention. FIG. 8 is a flowchart showing splicing work execution time management in the electronic component mounting apparatus according to the embodiment of the present invention. is there.
[0013]
First, the structure of the electronic component mounting apparatus will be described with reference to FIG. In FIG. 1, an electronic component mounting apparatus 1 includes a component supply unit 2 that supplies an electronic component, and a plurality of tape feeders 4 are arranged on the upper surface of a feeder base 3 provided in the component supply unit 2. . The tape feeder 4 pulls out a carrier tape 7 holding an electronic component from a plurality of supply reels 6 set on a carriage 5 positioned below the feeder base 3, and picks up the held electronic component by a transfer head 8. Supply up to. The transfer head 8 is controlled by the control unit 11, and the electronic component picked up from the tape feeder 4 is mounted on the substrate 10 positioned on the conveyance path 9.
[0014]
Next, the tape feeder 4 will be described with reference to FIGS. 2, 3, and 4. In FIG. 2, the tape feeder 4 is mounted with the lower surface of the main body 4a, which is an elongated frame member, along the upper surface of the feeder base 3, and the locking portion 4b provided on the lower surface of the main body 4a is connected to the feeder base 3. The position is fixed by being locked to the end of the. In this state, the feeder control unit 24 built in the main body 4a is connected to the control unit 11 (FIG. 1) of the electronic component mounting apparatus 1 via the connector 28 provided in the locking unit 4b. It has become.
[0015]
A push button switch 29 connected to the feeder control unit 24 is arranged on the upper surface on the front side of the tape feeder 4. By operating the push button switch 29, a signal is transmitted to the control unit 11 via the feeder control unit 24, and the number of remaining parts is reset to an initial value as will be described later.
[0016]
A sprocket 21 is disposed at the front end of the tape feeder 4 (on the right side in FIG. 2). As shown in FIG. 3, on the outer periphery of the sprocket 21, feed pins 21 a that mesh with tape feed holes 7 b provided at a predetermined pitch on the carrier tape 7 are provided at an equal pitch. Is provided with a tooth surface that meshes with a bevel gear coupled to the output shaft of the motor 22.
[0017]
When the motor 22 is driven to rotate, the sprocket 21 rotates, whereby the carrier tape 7 is fed by tape. In this tape feeding operation, the sprocket 22 performs an intermittent rotation operation corresponding to the pitch feeding pattern, and by controlling the rotation of the motor 22, the pitch feeding speed setting and tape positioning of the carrier tape 7 are performed. The motor 22 and the sprocket 21 are a tape feeding mechanism that feeds the carrier tape 7 at a predetermined pitch.
[0018]
By this tape feeding, the carrier tape 7 is pulled out from the supply reel 6. The drawn out carrier tape 7 is guided from the rear end portion into the tape feeder 4 and fed forward along the tape feeding path. The front end portion of the tape feeder 4 is a position for picking up an electronic component by the transfer head 8, and the fed carrier tape 7 is pitch-fed in a state of being covered with a cover member 23 provided on the upper surface. .
[0019]
In the middle of this pitch feed, the electronic component P held in the recess 7 a of the carrier tape 7 is picked up by the transfer head 8 through the notch 23 a provided in the cover member 23. The cutout portion 23a is a pickup position for picking up and taking out the electronic component P by the transfer head 8, and is a cover tape attached to cover the concave portion 7a of the carrier tape 7 before this pickup position. 7c is peeled off. Then, the electronic component P exposed in the recess 7 a by this cover tape peeling is picked up by the transfer head 8 and mounted on the substrate 10.
[0020]
Next, referring to FIG. 1, of the functions of the control system of the electronic component mounting apparatus, the splicing operation for joining the end of the already mounted carrier tape 7 and the start of the new carrier tape 7 in the tape feeder 4 is performed. Functions related to execution time management will be described. In FIG. 1, the control unit 11 is connected to a data storage unit 12, a remaining part count unit 13, a remaining tape length calculation unit 14, and a display unit 15.
[0021]
The data storage unit 12 stores data of a warning remaining tape length 12a, a minimum remaining tape length 12b, and a tape feed pitch 12c. The feed pitch 12c indicates the pitch when the tape feed mechanism pitch-feeds the carrier tape, and coincides with the component pitch p (see FIG. 3) in the carrier tape 7.
[0022]
Here, the remaining tape length will be described with reference to FIG. The remaining tape length indicates the remaining length of the carrier tape 7 accommodated with the electronic component held in the tape feeder 4, and is wound around the supply reel 6 as shown in FIG. Further, the length Lr of the carrier tape 7 drawn from the supply reel 6 to the rear part of the tape feeder 4 and the length Lf drawn from the rear part of the tape feeder 4 to the inside of the feeder to the pickup position by the transfer head 8. It means the length that added.
[0023]
Since the carrier tape 7 is held at every pitch p (see FIG. 3) determined according to the type of electronic component, the remaining tape length can be supplied by the carrier tape 7 remaining in the tape feeder 4. This means the number of electronic parts (number of remaining parts). That is, for the carrier tape 7 holding the same type of electronic components, it can be said that the “remaining tape length” and the “remaining component count” are synonymous data that can be converted to each other.
[0024]
The warning remaining tape length 12a and the minimum remaining tape length 12b are parameters that are defined by using the above-mentioned remaining tape length and are used in execution time management of the splicing operation. The remaining warning tape length 12a indicates the remaining tape indicating the timing at which it is necessary to warn that the amount of winding and storing of the carrier tape 7 in the already installed supply reel 6 is reduced, and that splicing work with a new carrier tape 7 is required soon. It is long.
[0025]
That is, if the remaining tape length is reduced to the warning remaining tape length as the designated length designated in advance, the control unit 11 uses the tape feeder 4 to replace the existing carrier tape 7 with the newly supplied carrier tape 7. Notification of the splicing work time when the work to be joined is required. The warning remaining tape length 12a is determined in consideration of preparation time for splicing work and time required for the work execution after the warning is notified, and as shown in FIG. The tape length La corresponding to the tape consumption length corresponding to the necessary time is added.
[0026]
The minimum remaining tape length 12b is a remaining tape length for ensuring good workability in the splicing operation, so that the position where the two old and new carrier tapes 7 are joined is not excessively close to the tail portion of the tape feeder 4. As shown in FIG. 4C, the minimum work margin length Lm is added to the remaining tape length Lf described above.
[0027]
That is, if the remaining tape length decreases to the minimum remaining tape length as a preset lower limit length, the control unit 11 stops the tape feeding in the tape feeder 4. As a result, a state in which the tail portion of the carrier tape 7 extends from the tail portion of the tape feeder 4 by the minimum work margin length Lm is ensured, and the splicing work can be performed with good workability. Therefore, the control unit 11 and the data storage unit 12 serve as splicing work execution ensuring means for ensuring that the splicing work is reliably executed.
[0028]
The remaining component count unit 13 counts the number of electronic components that can be supplied by the tape feeder 4 in real time and holds the number as the remaining components. This count is obtained by subtracting the number of parts from the initial value every time the tape feeding operation is performed after a new supply reel is mounted and the number of remaining parts is reset to a predetermined initial value. The remaining tape length calculation unit 14 calculates the remaining tape length based on the number of remaining parts. In other words, the remaining tape length at each time point is obtained by multiplying the remaining component count held in the remaining component count counter 13 by the tape feed pitch 12c stored in the data storage section 12. The remaining tape length calculation unit 14 is a remaining tape length calculation unit that calculates the remaining tape length.
[0029]
The display unit 15 is a display device, and displays a notice of the above-mentioned splicing operation time according to a command from the control unit 11 and a tape feed stop when the remaining tape length is reduced to the minimum remaining tape length. With these displays, the machine operator prepares and executes the splicing work.
[0030]
Here, with reference to FIG. 6, the splicing performed when the carrier tape 7 accommodated in the supply reel 6 is consumed in the electronic component mounting operation and the component is cut will be described. In FIG. 6, 7A and 7B indicate the carrier tape 7 in an already mounted state and the carrier tape 7 accommodated in a new supply reel, respectively.
[0031]
In tape splicing, the end of the carrier tape 7A and the top of the carrier tape 7B are abutted using a dedicated jig, and the adhesive tape 30 for splicing is attached to the front and back of the carrier tape 7 in a predetermined range with the abutting line interposed therebetween. To wear. Thereby, as shown in FIG.6 (b), two carrier tapes 7A and 7B are joined. By this splicing, the carrier tape 7 is continuously pitch-fed without being interrupted, so there is an advantage that it is not necessary to stop the mounting operation when supplying the parts.
[0032]
In the electronic component mounting apparatus shown in the present embodiment, in splicing, not only the adhesive tape 30 for joining the tape but also the adhesive tape 31 for closing the feed hole is stuck on the feed hole 7b located near the butt line. Like to do. The adhesive tape 31 is provided with a slit 31a in the longitudinal direction, and when the pin 21a of the sprocket 21 is fitted into the feed hole 7b from below, the pin 21a can protrude upward via the slit 31a. Therefore, there is no trouble in feeding the tape.
[0033]
This feed hole blockage is performed for the purpose of distinguishing the seam from other parts so that the seam of the carrier tapes 7A and 7B can be automatically detected using the feed hole 7b as will be described later. Is. By detecting the seam, it is possible to specify the supply start point of the series of carrier tapes 7 supplied by the individual supply reels, and therefore it is possible to accurately predict the timing of the next tape splicing execution.
[0034]
Next, this seam detection will be described. As shown in FIG. 3, a sensor 25 for detecting the feed hole 7b of the carrier tape 7 is disposed on the front side of the notch 23a which is the pickup position. The sensor 25 includes a light projecting unit 25a and a light receiving unit 25b. The light received from the light projecting unit 25a is received by the light receiving unit 25b, thereby detecting the presence or absence of the feed hole 7b of the carrier tape 7.
[0035]
The feed hole detection signal from the light receiving unit 25b is sent to the joint detection unit 24a of the feeder control unit 24. The joint detection unit 24a detects the joint of the carrier tape 7 based on a feed hole detection signal described below. The detection result is sent to the control unit 11 of the electronic component mounting apparatus.
[0036]
The feed hole detection signal will be described. As shown in FIG. 5A, a plurality of openings are provided in front of and behind the notch 23 a of the cover member 23. A groove 23b for escaping the pin 21a is provided at a position corresponding to the sprocket 21 on the front side of the notch 23a, and the feed pin 21a protruding from the feed hole 7b of the carrier tape 7 to the upper surface side is a cover member. 23 is not interfered with.
[0037]
On the rear side of the notch 23a, an opening 23c is provided corresponding to the position of the sensor 25, and the tape feeding path 27 along which the carrier tape 7 travels also corresponds to the position of the opening 23c. An opening 27a is provided. As shown in FIG. 5 (b), when the feed hole 7b is at the position of the optical axis a of the sensor 25, the light projected from the light projecting portion 25a located below the opening 27a is changed to the opening 27a, By passing through the feed hole 7b and the opening 23c and being received by the light receiving part 25b, a light reception signal indicating the presence of the feed hole 7b is transmitted. When the range other than the feed hole 7b is at the position of the optical axis a, a light shielding signal indicating that there is no feed hole is transmitted.
[0038]
That is, when the normal range where the carrier tape 7 is not joined passes through the inspection position of the sensor 25, the feed hole detection signal corresponds to the feed pitch p in the carrier tape 7, as shown in FIG. It becomes a signal of a pattern in which light reception and light shielding are repeated at regular intervals. On the other hand, as shown in FIG. 5 (c), when the splicing is performed and the joint where the upper surface of the feed hole 7b is closed by the adhesive tape 31 is at the position of the optical axis a, the light is projected from the light projecting portion 25a. As a result of the light being shielded by the adhesive tape 31 even at the feed hole position, a light-shielding signal is transmitted for all the areas where the adhesive tape 31 is adhered.
[0039]
That is, when the seam passes the inspection position of the sensor 25, the feed hole detection signal is shielded by a pitch corresponding to the number of feed holes 7b blocked (4p in this case) as shown in FIG. It becomes a signal of a pattern in which the state continues. When the joint detection unit 24a always receives the above-described feed hole detection signal, the timing at which the joint of the carrier tape 7 passes the inspection position of the sensor 25 is detected, and this detection timing is transmitted to the control unit 11.
[0040]
Therefore, the sensor 25 and the seam detection unit 24a serve as a seam detection means for detecting the seam of the carrier tape 7 on the front side of the pickup position. Then, the control unit 11 resets the holding count value of the remaining component number counting unit 13 to the initial value with reference to the timing at which the joint is detected. Thereby, the remaining tape length calculated based on the number of remaining parts is simultaneously reset to the initial value. The control unit 11 is a remaining tape length resetting unit that resets the remaining tape length to the initial value based on the seam detection signal from the seam detecting unit.
[0041]
The electronic component mounting apparatus is configured as described above. Next, the splicing work execution timing management performed for each tape feeder during the mounting operation of the electronic component mounting apparatus electronic component is performed according to the flow of FIG. explain.
[0042]
First, the number of remaining components is confirmed by the remaining component count unit 13 during the mounting operation of taking out the electronic components from the tape feeder 4 by the transfer head 8 and mounting them on the substrate 10 (ST1). Based on the confirmed number of remaining parts, the remaining tape length calculation unit 14 calculates the remaining tape length (ST2). Next, it is determined whether or not the calculated remaining tape length has decreased to the warning remaining tape length (ST3).
[0043]
If the tape has not yet decreased to the warning remaining tape length, the mounting operation is continued (ST4). If it has already decreased to the remaining tape length, a warning that the time for executing the splicing work is approaching is displayed (ST5). Upon receiving this warning, the machine operator executes the splicing work (ST6).
[0044]
At this time, if the splicing operation is not executed for some reason, the apparatus is stopped at the timing when the remaining tape length is reduced to the minimum remaining tape length (ST7). As a result, when the tape feeding stops with the end of the already mounted carrier tape 7 extending from the tail of the tape feeder 4 by the minimum working margin length Lm, the machine operator misses the warning display. Even if it exists, reliable execution of splicing work and good workability are ensured.
[0045]
When splicing is executed in (ST6), the machine operator operates the push button switch 29 arranged on the tape feeder 4. As a result, the number of remaining components in the remaining component count section 13 is reset to an initial value indicating the number of supplied reel storage components (ST8). When the seam joined by the splicing operation reaches the position of the sensor 25 shown in FIG. 3, the seam is detected (ST9). By detecting the joint, the number of remaining parts is reset to the initial value again (ST10).
[0046]
It should be noted that only one of the remaining component number resets in (ST8) and (ST10) may be performed. That is, when there is no joint detection function by the sensor 25, reset by the push button switch operation immediately after execution of the splicing operation shown in (ST8), and when there is a joint detection function, reset by the joint detection signal shown in (ST10) Can be done. At this time, as shown in the flow of FIG. 8, there is an advantage that accumulation of errors in the number of remaining parts can be prevented by executing the remaining parts number reset twice.
[0047]
As described above, the electronic component mounting apparatus shown in the present embodiment replaces the number of remaining components used conventionally as a parameter used for splicing operation execution time management with this remaining component number as the tape length. The converted remaining tape length is used. As a result, the aforementioned parameters can be set in association with the position of the end portion of the already mounted tape, and the splicing operation can always be set at a position where workability is good.
[0048]
【The invention's effect】
According to the present invention, it is provided with the remaining tape length calculating means for calculating the remaining tape length indicating the remaining length of the carrier tape accommodated in the state where the electronic component is held, so that the end portion of the already-mounted tape is within the desired range. The splicing work of joining the tapes in a state inside can be performed, and good workability can be ensured.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an electronic component mounting apparatus according to an embodiment of the present invention. FIG. 2 is a side view of a tape feeder according to an embodiment of the present invention. FIG. 4 is an explanatory view showing the remaining tape length in the tape feeder according to the embodiment of the present invention. FIG. 5A is a portion of the cover member of the tape feeder according to the embodiment of the present invention. (B) Partial side view of the cover member of the tape feeder according to one embodiment of the present invention (c) Partial side view of the cover member of the tape feeder according to one embodiment of the present invention FIG. 7 is an explanatory diagram of tape splicing in the electronic component mounting apparatus according to the embodiment. FIG. 7 is an explanatory diagram of seam detection in the electronic component mounting apparatus according to the embodiment of the present invention. Mounting device Flowchart showing writhing work execution timing management EXPLANATION OF REFERENCE NUMERALS
DESCRIPTION OF SYMBOLS 1 Electronic component mounting apparatus 2 Component supply part 4 Tape feeder 7 Carrier tape 8 Transfer head 10 Board | substrate 13 Remaining part number count part 14 Remaining tape length calculation part

Claims (3)

An electronic component mounting apparatus that takes out an electronic component from a component supply unit by a transfer head and mounts the electronic component on a board, and picks up the carrier tape arranged on the component supply unit and holding the electronic component by pitch feeding. A tape feeder for supplying an electronic component to the position, and a remaining tape length calculating means for calculating a remaining tape length indicating the remaining length of the carrier tape accommodated with the electronic component held in the tape feeder. An electronic component mounting apparatus. If the remaining tape length is reduced to a specified length specified in advance, a notice is made of a splicing work time when splicing work for splicing an existing carrier tape and a newly supplied carrier tape is required in the tape feeder. And a splicing operation execution ensuring means for ensuring that the splicing operation is reliably executed by stopping the tape feeding in the tape feeder when the remaining tape length is reduced to a preset lower limit length. The electronic component mounting apparatus according to claim 1, wherein: A seam detecting means for detecting a seam of the carrier tape on the front side of the pickup position, and a remaining tape length resetting means for resetting the remaining tape length to an initial value based on a seam detection signal by the seam detecting means. The electronic component mounting apparatus according to claim 1.

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