KR102241504B1 - A tape feeder and self-diagnosing method of the tape feeder - Google Patents

Abstract

According to an aspect of the present invention, a tape feeder for supplying the component to a pickup position of a component mounting apparatus by pitch conveying a tape supporting the component, comprising: an introduction portion into which the tape is introduced and a tape transport path connected to the pickup position; , By comparing the light-receiving amount by the light-receiving part of the tape with a reference value and an optical sensor having a light-emitting part and a light-receiving part arranged to face the tape in the transfer path of the tape, and It provides a tape feeder having a control unit for self-diagnosing the presence or absence of an abnormality.

Description

A tape feeder and self-diagnosing method of the tape feeder

The present invention relates to a tape feeder for supplying electronic components to a pickup position of a component mounting apparatus by pitch-feeding a component supply tape (hereinafter, simply referred to as "tape") in which electronic components are arranged at a predetermined pitch. In particular, it relates to a technology for self-diagnosing whether or not an optical sensor function for detecting an object to be detected, such as a component disposed on a tape, is abnormal.

As a method of supplying electronic components to a pickup position of a nozzle of a transfer head in a component mounting apparatus, a method using a tape feeder is known. In this method, the tape holding the electronic component at a predetermined pitch is taken out from the supply reel, and the tape is delivered to the nozzle by pitch feeding in synchronization with the mounting timing of the component.

In this method of supplying parts using a tape feeder, when the used tape is used up, it is necessary to supply a new tape to the tape feeder. In order to efficiently switch such tapes, the end of the part of the tape being used is detected by the tape feeder. It is effective. In other words, the tape has parts arranged at a predetermined pitch along its longitudinal direction, and there is a so-called trail part in which no parts are placed behind the end of the tape part among the parts of the tape, so the end of the part reaches the pickup position of the nozzle. On the lower surface, it is preferable for the trailing portion to be discharged quickly from the tape feeder from the viewpoint of productivity improvement.

On the other hand, Japanese Laid-Open Patent Publication No. 2008-277509 discloses a tape feeder having a component termination detection unit for detecting a conventional component termination. The component end detection unit disclosed in Japanese Patent Laid-Open No. 2008-277509 is equipped with a transmissive optical sensor. Specifically, when a light-emitting portion disposed on the upper surface of the tape and a light-receiving portion disposed opposite the light-emitting portion on the lower surface of the tape, and the spot light from the light-emitting portion is blocked by a part, the received light amount is less than a preset light amount Determines that there is a part in the Then, when the number of times the component end detection unit does not detect the component during the tape transfer operation (the number of times that the component is not determined) reaches a predetermined number of times, it is determined that the tape is replaced.

However, if there is an abnormality in the sensor function by such an optical sensor, an error occurs in the detection of the end of the component. For example, when foreign matter adheres to the light emitting portion or the light receiving portion of the optical sensor, spot light from the light emitting portion is always blocked, and it is determined that there is a component even if there is no component. In that case, even when the end of the part actually arrives and the tape is replaced, the tape without parts is continuously used, resulting in a stop in the driving of the part mounting apparatus.

Further, due to an abnormality in wiring or circuitry of the light-receiving unit of the optical sensor, there is a case where a signal indicating that the light-receiving unit has received light even though the spot light from the light-emitting unit has not been received. In that case, it is determined that there are no parts even if there are parts, and if so, the tape with parts is discharged from the tape feeder, and the parts are discarded unnecessarily because it is mistaken that the part end has arrived even though the actual part end has not arrived.

As described above, when there is an abnormality in the sensor function of the optical sensor, the presence or absence of a detection object such as a part is erroneously determined, and therefore, it is desirable to detect the abnormality in the sensor function early.

According to an aspect of the present invention, in a tape feeder having an optical sensor that detects a detection object such as a component disposed on a tape, an abnormality in the sensor function of the optical sensor can be detected early, thereby The main object is to provide a tape feeder capable of detecting presence or absence with high precision, and a self-diagnosis method thereof.

According to an aspect of the present invention, there is provided a tape feeder for supplying the component to a pickup position of a component mounting apparatus by pitch conveying a tape supporting the component, comprising: a tape conveying path connected to an introduction portion into which the tape is introduced and the pickup position; And, an optical sensor having a light-emitting unit and a light-receiving unit disposed to face the tape in the transfer path of the tape, and detecting an object to be detected of the tape; And, by comparing the amount of light received by the light-receiving unit of the optical sensor with a reference value, the It provides a tape feeder having a; control unit for self-diagnosing the presence or absence of an abnormality in the optical sensor.

Here, the control unit may perform the self-diagnosis when the tape does not exist at a position corresponding to the optical sensor.

Here, the reference value may be determined based on electrical and optical characteristics inherent in the optical sensor.

Here, the control unit may perform the self-diagnosis when the tape is present at a position corresponding to the optical sensor.

Here, the reference value may be determined based on a representative value of the light-receiving amount of the light-receiving unit for each pitch transfer at the leading portion of the tape.

Here, a tape end detection sensor capable of detecting the front and rear ends of the tape in a portion closer to the optical sensor in the transfer path of the tape based on the introduction part of the tape, and the control unit is configured by the tape end detection sensor. It may be determined whether the tape is present at a position corresponding to the optical sensor based on the detection information of the front and rear ends of the tape.

In addition, according to another embodiment of the present invention, it includes an optical sensor that detects a detection object of a tape supporting the component, and supplies the component to the pickup position of the component mounting device by pitching the tape along the tape transport path. A self-diagnosis method of a tape feeder, comprising: determining whether the tape is present at a position corresponding to the optical sensor; and determining a reference value based on a result of the determining of the presence of the tape; and It provides a self-diagnosis method of a tape feeder comprising the step of self-diagnosing the presence or absence of an abnormality in the optical sensor by comparing the amount of light received by the light-receiving unit of the optical sensor with the reference value.

Here, when the tape does not exist at a position corresponding to the optical sensor, the reference value may be determined based on electrical and optical characteristics inherent in the optical sensor.

Here, when the tape is present at a position corresponding to the optical sensor, the reference value may be determined based on a representative value of the light-receiving amount of the light-receiving unit for each pitch transfer at the leading portion of the tape.

Here, the step of determining the presence of the tape may include: a tape end detection sensor capable of detecting the front and rear ends of the tape installed in the conveying path of the tape to detect the front and rear ends of the tape; and, the tape end detection sensor It may include the step of determining whether the tape is present at a position corresponding to the optical sensor based on the detection information of the front and rear ends of the tape.

According to an embodiment of the present invention, it is possible to detect an abnormality in the sensor function early by self-diagnosing the presence or absence of an abnormality in the sensor function of the optical sensor during the operation of the tape feeder. Thereby, the presence or absence of a detection object, such as a part, can be detected with high precision, and situations such as the absence of a part and the parts mounting apparatus stop operation or wasteful discarding of a part can be prevented.

1 is a schematic overall configuration diagram showing a tape feeder according to an embodiment of the present invention.
2 is an enlarged view of a part detection sensor (optical sensor) part of a tape feeder according to an embodiment of the present invention.
3 is an enlarged schematic view of a tape end detection sensor part of a tape feeder according to an embodiment of the present invention.
Fig. 4 is an explanatory diagram showing a tape introduction operation (loading operation) of the tape feeder according to an embodiment of the present invention according to the sequence of time.
5 is an explanatory diagram showing an auto splicing operation of a tape feeder according to an exemplary embodiment of the present invention according to the sequence of time.
6 is a flowchart showing a procedure for self-diagnosis of a sensor function of a tape feeder according to an embodiment of the present invention.
7 is an explanatory diagram defining an operating state of a tape feeder according to an embodiment of the present invention.
8 is a diagram showing electrical and optical properties of a tape feeder according to an embodiment of the present invention.
9 is an explanatory diagram showing a teach section and a judge section of a tape in Algorithm 2 according to an embodiment of the present invention.

Hereinafter, the present invention according to a preferred embodiment will be described in detail with reference to the accompanying drawings. In addition, in this specification and drawings, redundant descriptions are omitted by using the same reference numerals for components having substantially the same configuration.

Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings.

1 is a schematic overall configuration diagram showing a tape feeder 100 according to an embodiment of the present invention.

The tape feeder 100 is configured by arranging elements described below in an elongated box-shaped tape feeder body 1, and by pitching the tape T supporting the electronic component, the electronic component is transferred to the component. It is supplied to the pickup position P of the mounting device. Although not shown, electronic components are supported on the tape T at a predetermined pitch (positive pitch) along the longitudinal direction thereof.

The tape feeder main body 1 is provided with a tape main conveying path 2 connected to a pickup position P located at the top.

The entrance side of the tape main transport path 2 is branched into two systems of the first tape introduction path 3 and the second tape introduction path 4, and the tape main transport path 2, the first tape introduction path 3 ), the second tape introduction path 4 forms a "tape transfer path".

That is, the tape feeder 100 is provided with a first tape introduction path 3 and a second tape introduction path 4 as a tape introduction path for introducing the tape T into the tape main conveying path 2, Each end of the first tape introduction path 3 and the second tape introduction path 4 is connected to the tape main transfer path 2.

The tape (T) is first introduced from the first tape introduction part (3a) of the first tape introduction path (3), and then is sequentially guided along the first tape introduction path (3) and the tape main transfer path (2) to be transferred. do.

After that, the tape T is moved to the second tape introduction path 4 by a tape position switching means (not shown).

In the tape main conveying path 2 located on the upper side of the tape feeder main body 1, a first sprocket 5 is arranged as a first tape conveying means for sending the tape T toward the pickup position P. .

The teeth of the first sprocket 5 are meshed with a tape conveying hole (not shown) formed in a positive pitch in the tape T, and the first sprocket 5 rotates pitch, thereby pitching the tape T.

Since the first sprocket 5 receives power from the first motor 7 by a plurality of intermediate gears 6, the first sprocket 5 rotates by rotational driving of the first motor 7. The installation position of the first sprocket 5 approaches the pickup position P of the component.

On the other hand, as a second tape conveying means for conveying the tape toward the tape main conveying path 2, the second sprocket 8 is disposed on the side of the first tape introducing path 3.

The teeth of the second sprocket 8 are meshed with the tape conveying hole (not shown) formed with a constant pitch in the tape T, and the second sprocket 8 rotates in a pitch so that the tape T is introduced into the first tape. It is sent along the furnace (3) toward the tape main transport route (2).

The second sprocket 8 rotates by receiving power from the second motor 9 by a plurality of intermediate gears 6.

On the other hand, in the tape main conveying path 2, the 3rd sprocket 10 is arrange|positioned as 3rd tape conveying means for sending the tape T toward the 1st sprocket 5.

The teeth of the third sprocket 10 are meshed with a tape conveying hole (not shown) formed with a positive pitch in the tape T, and the third sprocket 10 rotates in a pitch so that the tape is transferred to the tape main conveying path (2). It is sent to the first sprocket 5 along the line.

Since the third sprocket 10 receives power from the third motor 11 by a plurality of intermediate gears 6, the third sprocket 10 rotates by rotational driving of the third motor 11.

Meanwhile, rotational driving of the first motor 7, the second motor 9, and the third motor 11 is controlled by the controller 12. The types of the first motor 7, the second motor 9 and the third motor 11 are not particularly limited, but the first motor 7, the second motor 9 and the third motor according to the present embodiment In (11), a servo motor with an encoder is used.

On the left side of the third sprocket 10 in the tape main transport path 2, a component detection sensor 13 for detecting an electronic component supported by the tape T is disposed, and the component detection sensor 13 On the right side, a hole detection sensor 14 for detecting the tape feed hole portion of the tape T is disposed.

In addition, a tape end detection sensor 15 for detecting the ends (front and rear ends) of the tape T is disposed on the left side of the component detection sensor 13, and furthermore, a tape end detection sensor 15 is disposed on the left side of the tape end detection sensor 15. 1 A tape tip detection sensor 16 is disposed on the side of the tape introduction path 3.

The component detection sensor 13 is a transmissive optical sensor, and as shown in FIG. 2, a light emitting portion 13a disposed under the tape T passing through the tape main transport path 2, and a light emitting portion 13a A light receiving portion 13b disposed above the tape T is provided opposite to ).

When an electronic component (not shown) supported by the tape T comes to the optical axis position of the component detection sensor 13, spot light from the light-emitting section 13a is blocked by the electronic component, thereby reducing the amount of light received by the light-receiving section 13b. do. The light-receiving amount information from the light-receiving unit 13b is transmitted to the control unit 12, and the control unit 12 detects the presence or absence of an electronic component supported on the tape based on the light-receiving amount information from the parts detection sensor 13, In addition, the arrival of the component end portion of the tape T is detected.

Further, the hole detection sensor 14 is also a transmissive optical sensor of the same type as the component detection sensor 13, and detects the presence or absence of a hole for conveying tape by the same principle as the component detection sensor 13.

The tape end detection sensor 15 is a mechanical sensor using a sensor lever 15a, as shown in Fig. 3, and includes a sensor lever 15a and an optical sensor element 15b.

One end of the lever 15a is located in the tape main transport path 2, and the other end of the lever 15a is located between the light emitting portion and the light receiving portion of the sensor element 15b.

When the tip of the tape T arrives at the position of one end of the lever 15a, one end of the lever 15a is lifted by the tip of the tape T, and the lever 15a is moved around the support shaft 15a-1. Rotate. As a result, the light from the light-emitting portion of the sensor element 15b is received by the light-receiving portion, the sensor element 15b is turned on, and the tip of the tape T is detected.

While the tape T passes, one end of the lever 15a is in a raised state, and the sensor element 15b is also in an ON state, and the presence of the tape T is detected. When the rear end of the tape T passes, one end of the lever 15a goes down. Thereby, the sensor element 15b turns from ON to OFF, and the rear end of the tape T is detected. The tape end detection information by the tape end detection sensor 15 is transmitted to the control unit 12.

In addition, the tape tip detection sensor 16 is also a mechanical sensor of the same type as the tape end detection sensor 15, and according to the same principle as the tape end detection sensor 15, the tape T in the first tape introduction path 3 The tip of) is detected. The tape tip detection information by the tape tip detection sensor 16 is also transmitted to the control unit 12.

Next, the operation of the tape feeder 100 of this embodiment will be described.

Fig. 4 shows an operation when introducing (loading) a tape (preceding tape T1) into the tape feeder for the first time. Fig. 4(a) shows the state before the tape is introduced.

First, as shown in Fig. 4(b), the preceding tape T1 is introduced into the first tape introduction path 3 from the tape introduction part 3a. Specifically, while driving the second motor 9 to rotate the second sprocket 8, the preceding tape T1 is manually introduced from the tape introduction part 3a into the first tape introduction path 3, and the preceding tape T1 The tape transfer hole of) is engaged with the second sprocket (8). When the preceding tape (T1) is engaged with the second sprocket (8), the preceding tape (T1) is automatically conveyed by the second sprocket (8), and along the first tape introduction path (3) and the tape main conveying path (2). It is transferred to the right.

And, as shown in Fig. 4(c), when the leading end of the preceding tape T1 reaches the tape end detection sensor 15, the tape end detection sensor 15 is turned on. Thereby, the control unit 12 detects that the leading end of the preceding tape T1 has reached the tape end detection sensor 15. After the tip of the preceding tape T1 passes through the tape end detection sensor 15, the control unit 12 recognizes and monitors the tip position of the preceding tape T1 based on the encoder value of the second motor 9 .

Subsequently, by the drive of the second motor 9, the preceding tape T1 is transferred to the right along the tape main transfer path 2, passes through the parts detection sensor 13 and the hole detection sensor 14, and This third sprocket 10 is reached (Fig. 4(d)).

When the tip of the preceding tape T1 reaches the third sprocket 10, the second motor 9 is stopped, and instead, the third motor 11 is driven. Accordingly, the third sprocket 10 rotates, and the preceding tape T1 is transferred toward the first sprocket 5. After the tip of the preceding tape T1 reaches the third sprocket 10 and the third motor 11 is driven, the control unit 12 determines the preceding tape T1 based on the encoder value of the third motor 11. Recognize and monitor the position of the tip of the vehicle.

After that, by driving of the third motor 11, the leading end of the preceding tape T1 reaches the first sprocket 5 (Fig. 4(e)). Thereby, the introduction of the preceding tape T1 is completed. That is, when the tip of the preceding tape T1 reaches the first sprocket 5, the third motor 11 stops, and instead, the first motor 7 is driven. As a result, the first sprocket 5 rotates pitch so that the preceding tape T1 is pitch-transferred, and the parts disposed on the preceding tape T1 are sequentially supplied to the pickup position P (Fig. 4(f)). .

Next, an auto splicing function for automatically supplying (introducing) the preceding tape T1 and the subsequent tape T2 to be used after the preceding tape T1 will be described with reference to FIG. 5.

As shown in Fig. 5(a), the subsequent tape T2 is introduced into the first tape introduction path 3 from the tape introduction portion 3a during use of the preceding tape T1. Specifically, as in the case of introducing the preceding tape T1, the subsequent tape T2 is manually removed from the tape introduction part 3a while rotating the second sprocket 8 disposed in the first tape introduction path 3. 1 It is introduced into the tape introduction path 3, and the tape conveying hole of the subsequent tape T2 is engaged with the second sprocket 8. When the second sprocket 8 is engaged, the subsequent tape T2 is automatically conveyed by the second sprocket 8. Then, when the tip of the subsequent tape T2 is detected by the tape tip detection sensor 16, the control unit 12 stops the second motor 9. Thereby, the subsequent tape T2 stops at the position of the tape tip detection sensor 16 as shown in Fig. 5A, and waits until the splicing operation is performed.

Here, before introducing the subsequent tape T2 from the tape introduction portion 3a into the first tape introduction passage 3, the preceding tape T1 is already moved to the second tape introduction passage 4. This is because the tape feeder of the present embodiment has two systems of tape introduction paths, a first tape introduction path 3 and a second tape introduction path 4, and the present invention is a tape having two systems of tape introduction paths. It is not limited to a feeder, but can also be applied to a tape feeder having only one system of tape introduction paths.

In this embodiment, the splicing operation is started when the rear end of the preceding tape T1 passes through the third sprocket 10, as shown in FIG. 5(b). The time when the rear end of the preceding tape T1 passes through the third sprocket 10 is the encoder of the first motor 7 from the time when the tape end detection sensor 15 detects the passing of the rear end of the preceding tape T1. It can be detected based on the value.

When the rear end of the preceding tape T1 passes through the third sprocket 10, the control unit 12 rotates the second motor 9. Thereby, the subsequent tape T2 is conveyed to the first tape introduction path 3 and is conveyed to the tape main conveying path 2. Thereafter, as in the case of the preceding tape T1, the tip of the subsequent tape T2 passes through the tape end detection sensor 15 (Fig. 5(c)), and the first sprocket passes through the third sprocket 10. (5) is reached (Fig. 5(d)). Thereby, the splicing operation is completed. After that, the first sprocket 5 rotates pitch so that the subsequent tape T2 is pitch-transferred, and the parts held in the subsequent tape T2 are sequentially supplied to the pickup position P (Fig. 5(e)). . After that, during the splicing operation, the next splicing operation is performed by repeating the sequence of Figs. 5(a) to 5(d).

As described above, the tape feeder 100 according to the present embodiment continuously operates by repeatedly performing the splicing operation. Then, the tape feeder 100 simultaneously performs self-diagnosis of the sensor function by the component detection sensor 13 during its operation. Hereinafter, a self-diagnosis function of the tape feeder 100 will be described.

6 is a flowchart showing a self-diagnosis operation sequence of a sensor function of a tape feeder according to an embodiment of the present invention. This self-diagnosis operation is controlled and executed by the controller 12.

In the self-diagnosis shown in FIG. 6, different algorithms are used in the case where the tape is present at the position corresponding to the part detection sensor 13 and the case where the tape does not exist. So, first, it is determined whether the tape is present at a position corresponding to the component detection sensor 13. Specifically, the status (operation status) of the tape feeder is classified into the statuses A to K shown in Fig. 7, and if the status is A, B, C, G, H, K, it corresponds to the part detection sensor 13 It is judged that the tape does not exist at the position where it is made, and it is judged that the tape exists other than that.

The corresponding relationship between each status in FIG. 7 and FIGS. 4 and 5 is as follows.

Status A: Fig. 4(a)

Status B: Fig. 4(b)

Status C: Fig. 4(c)

Status D: Fig. 4(d)

Status E: Fig. 4(e), Fig. 4(f), Fig. 5(d), Fig. 5(e)

Status F: Fig. 5(a)

Status G: Fig. 5(b)

Status H: Fig. 5(c)

In addition, the statuses I, J, and K are classified by the position of the rear end of the preceding tape when no subsequent tape is introduced.

The status of the tape feeder is determined by the tape edge detection sensor 16 and the tape edge detection signal from the tape edge detection sensor 15 and the second motor 9, the third motor 11 and the first motor 7 It can be judged based on the encoder value of.

In order to determine whether the tape is present at the position corresponding to the component detection sensor 13, it is not necessary to classify it into the above-described statuses A to K. Whether the tape is present at a position corresponding to the component detection sensor 13 can be determined based on a detection signal from the tape end (the front and rear ends of the tape) from the tape end detection sensor 15. That is, since the distance from the tape end detection sensor 15 to the parts detection sensor 13 is already known, the tape end (the front and rear ends of the tape) corresponds to the tape end detection sensor 15 when the transfer speed of the tape is known later. Since it is possible to know the timing of reaching the target, it is thereby possible to determine whether the tape is present at a position corresponding to the part detection sensor 13.

The transfer speed of the tape can be obtained by the encoder value of the second motor 9 when the tip of the tape is transferred from the tape end detection sensor 15 to the parts detection sensor 13, and the rear end of the tape detects the tape end. When it is transferred from the sensor 15 to the component detection sensor 13, it can also be obtained by the encoder value of the first motor 7 respectively.

Returning to Fig. 6, if the status is A, B, C, G, H, K, it is determined that there is no tape at the position corresponding to the part detection sensor 13 (no tape), and self-diagnosis by Algorithm 1 Conduct.

On the other hand, if the status is not A, B, C, G, H, K, it is determined that the tape exists at the position corresponding to the part detection sensor 13 (there is tape), and self-diagnosis according to Algorithm 2 is performed.

Algorithm 1 and Algorithm 2 are to self-diagnose whether or not there is an abnormality in the sensor function by comparing the amount of light received by the light-receiving unit of the component detection sensor 13, which is an optical sensor, with a reference value. However, in Algorithm 1 and Algorithm 2, the used reference value (method of determining the reference value) is different.

The reference value of Algorithm 1 is determined based on the electrical and optical characteristics inherent in the component detection sensor 13. 8 shows the electrical and optical characteristics of the component detection sensor 13. The horizontal axis in Fig. 8 is the duty ratio in the PWM (pulse width modulation) of the light emitting portion of the component detection sensor 13, and the vertical axis is the A/D conversion value of the received light amount of the light receiving portion, that is, the sensor output.

As shown by line A in FIG. 8, the electrical and optical characteristics inherent in the component detection sensor 13 have a duty ratio of about 10.5% and a sensor output of 100%. On the other hand, if a foreign substance adheres to the light-emitting portion or the light-receiving portion, the external appearance becomes an electrical and optical characteristic, such as, for example, line B. On the other hand, if there is an abnormality in the wiring or circuit of the light receiving unit, etc., the electrical and optical characteristics of the line C may be exhibited in some cases. If it exhibits strange electrical and optical characteristics such as lines B and C, it is erroneously judged whether there is a part to be detected as described earlier. In other words, there is an abnormality in the sensor function.

Therefore, in Algorithm 1, the sensor function of the component detection sensor 13 is self-diagnosed with the sensor output when the duty ratio in the original electrical and optical characteristics of the component detection sensor 13 is 10.5% as one reference value. Specifically, as shown in Fig. 6, when the duty ratio is sequentially increased to 10.5%, and the sensor output at that time is less than 80% of the original electrical and optical characteristics, it is determined that there is an abnormality such as the above-described line B. On the other hand, when the sensor output becomes 100% before the duty ratio becomes 10.5%, it is determined that there is an abnormality such as the above-described line C.

Further, the reference value is only an example, and the reference value in the algorithm 1 is appropriately determined based on the electrical and optical characteristics inherent in the component detection sensor 13 to be used.

Next, Algorithm 2 will be described. Since Algorithm 2 is implemented when a tape is present at a position corresponding to the component detection sensor 13, the reference value is determined based on a representative value of the received light amount (sensor output) for each pitch feed at the leading portion of each tape.

Specifically, as shown in Fig. 9, the sensor when the head part (for 32 parts) of each tape is a teach section, and in this teach section, the part is at a position corresponding to the part detection sensor 13 The representative value of the output (average value, standard deviation, etc.) is used as the reference value (hereinafter referred to as "teach step"). Then, the rear from the teach section is divided into a plurality of judgment sections (one section is for 32 parts), and the sensor output in each judgment section is compared with the reference value to perform self-diagnosis of the sensor function of the component detection sensor 13 (Hereinafter referred to as the "decision stage").

Referring to Fig. 6, Algorithm 2 is executed when a tape is present at a position corresponding to the part detection sensor 13. First, it is determined whether the teach step for the tape is finished, and the teach step is terminated. If so, the judgment step is executed.

In the judging step, the sensor outputs for 32 parts are sequentially stored in the data buffer, and when this is done, it is compared with the reference value determined in the teach step. In Fig. 6, if the average value of the sensor output in the determination step is outside the range of 0.8 to 1.2 times the reference value, it is determined that there is an abnormality in the sensor function.

In addition, in Fig. 6, the self-diagnosis according to Algorithm 1 or 2 is performed depending on the presence or absence of a tape, but the self-diagnosis by Algorithm 1 may be performed only when there is no tape. You may make a diagnosis.

In addition, in the present embodiment, the case where the component detection sensor 13 is a transmissive optical sensor has been described, but the present invention is also applicable to a reflective optical sensor. In this case, the light-emitting portion and the light-receiving portion are arranged so as to face the component on the top or bottom side of the tape. In the case of a reflective optical sensor, when a part supported on the tape comes to the position of the optical axis of the sensor, spot light from the light emitting part is reflected by the part, thereby increasing the amount of light received by the light-receiving part. Can be detected and self-diagnosis can be performed In addition, the present invention is applicable to optical sensors other than the component detection sensor 13. For example, it is applicable to the hole detection sensor 14 as well. That is, as long as it is a detection object causing a change in the amount of light received by the light-receiving unit, the scope of application of the present invention is not limited to an optical sensor that detects a component.

Aspects of the present invention have been described with reference to the embodiments shown in the accompanying drawings, but these are only exemplary, and those of ordinary skill in the art can use various modifications and equivalent other embodiments therefrom. You will be able to understand the point. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

The present invention can be used in the manufacture and application of tape feeders.

100: tape feeder 1: tape feeder body
2: Tape main transport route 3: First tape introduction route
4: second tape introduction path 5: first sprocket
8: second sprocket 10: third sprocket
13: parts detection sensor 14: hole detection sensor
15: tape edge detection sensor 16: tape edge detection sensor

Claims (10)

As a tape feeder for feeding the parts to a pickup position of a part mounting device by pitching the tape supporting the parts,
A tape transfer path connected to an introduction portion into which the tape is introduced and the pickup position;
An optical sensor having a light-emitting part and a light-receiving part arranged to face the tape in the conveying path of the tape, and detecting an object to be detected of the tape; And
Comprising a control unit for self-diagnosing the presence or absence of an abnormality in the optical sensor by comparing the amount of light received by the light receiving unit of the optical sensor with a reference value,
The control unit,
When the tape does not exist at a position corresponding to the optical sensor, the self-diagnosis is performed using a reference value determined based on the electrical and optical characteristics inherent to the optical sensor,
When the tape is present at a position corresponding to the optical sensor, the tape feeder performs the self-diagnosis using a reference value that is determined based on a representative value of the light-receiving amount of the light-receiving unit for each pitch feed at the leading portion of the tape. . delete delete delete delete The method of claim 1,
A tape end detection sensor capable of detecting a front end and a rear end of the tape at a portion closer than the optical sensor in the transfer path of the tape with respect to the introduction part of the tape,
The control unit determines whether the tape is present at a position corresponding to the optical sensor based on detection information of the front and rear ends of the tape by the tape end detection sensor. A self-diagnosis method of a tape feeder, comprising an optical sensor for detecting a detection object of a tape supporting a component, and feeding the component to a pickup position of a component mounting apparatus by pitch-transporting the tape along a tape conveying path,
A tape presence determination step of determining whether the tape is present at a position corresponding to the optical sensor;
A reference value determination step of determining a reference value according to a result of the tape presence determination step; And
Comprising the step of self-diagnosing the presence or absence of an abnormality in the optical sensor by comparing the amount of light received by the light receiving unit of the optical sensor with the reference value,
When the tape does not exist at a position corresponding to the optical sensor, the reference value is determined based on the electrical and optical characteristics inherent to the optical sensor,
When the tape is present at a position corresponding to the optical sensor, the reference value is determined based on a representative value of an amount of light received by the light-receiving unit for each pitch feed at the leading portion of the tape. delete delete The method of claim 7,
The step of determining the existence of the tape,
Performing detection of the leading and trailing ends of the tape by a tape end detection sensor capable of detecting the leading and trailing ends of the tape installed in the conveying path of the tape; And
And determining whether a tape exists at a position corresponding to the optical sensor based on the detection information of the front and rear ends of the tape by the tape end detection sensor.

Images