JP2008172065A - Nozzle exchange unit, mounting machine with nozzle exchange unit and method for adjusting nozzle sensor of nozzle exchange unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform sensitivity adjustment of a nozzle sensor for detecting existence of a nozzle more simply. <P>SOLUTION: A nozzle exchange unit 19 comprises a section 30 for containing an exchange nozzle 21, a nozzle sensor 40 consisting of a transmission type optical sensor for detecting existence of a nozzle 21 in the nozzle containing section 30, and a means 36 for controlling operation of the nozzle sensor 40. The control means 36 is arranged to adjust the sensitivity of the sensor based on the detection values of a light receiving section 39 under two states where the light from a light projecting section 38 is received at a light receiving section 39 and a state where the light from the light projecting section 38 is not received at the light receiving section 39 by turning the light projecting section 38 of the nozzle sensor 40 on/off under a state where the nozzle 21 does not exist in the nozzle containing section 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mounting machine for mounting a component, and in particular, another component suction nozzle is provided to be replaceable with respect to a mounting head unit, and the nozzle is housed in a nozzle replacement unit as necessary. The present invention relates to the above-described nozzle replacement unit of a mounting machine configured to be replaced with a nozzle, and a mounting machine including the unit.

  Conventionally, a head unit that can move over a component supply unit and a printed circuit board positioned at a predetermined work position has been provided, and a component suction nozzle attached to the lower end of the head unit absorbs the component from the component supply unit. A mounting machine (surface mounting machine) for mounting on a printed circuit board is known.

  Further, as this type of mounting machine, there is also known one configured such that the nozzle of the head unit can be replaced according to the type of component to be sucked. For example, in Patent Document 1 described below, a nozzle is detachably provided to the head unit, and a nozzle replacement unit for replacing the nozzle is installed in a movable region of the head unit. The nozzle replacement unit has a nozzle storage portion in which a replacement nozzle is detachably stored. When the head unit accesses the nozzle storage portion from above, the nozzle of the head unit becomes the nozzle. It is comprised so that it can replace with the nozzle accommodated in the accommodating part.

By the way, the nozzle replacement unit as described above may be provided with a nozzle sensor for detecting the presence or absence of the nozzle in the nozzle housing portion, in order to confirm that the nozzle replacement has been performed. . As this nozzle sensor, for example, a so-called reflection type optical sensor has been used in which light irradiated from a light projecting unit and reflected by a nozzle is received by a light receiving unit, thereby detecting the presence or absence of the nozzle.
JP 2002-246800 A

  However, in the conventional nozzle replacement unit as described above, the reflectance of the light reflected by the nozzle differs depending on the color, shape, etc. of the nozzle. It is necessary to adjust the sensor sensitivity by actually creating and examining the detection value at the light receiving unit in each state. For this reason, especially when there are many types and number of nozzles stored in the nozzle storage section, it is necessary to adjust the sensor sensitivity as many times as that, and this operation takes a lot of time. There was a problem.

  The present invention has been made in view of the above circumstances, and the sensitivity of a nozzle sensor that detects the presence or absence of a nozzle in a nozzle replacement unit for replacing a component suction nozzle provided in a head unit of a mounting machine. The purpose is to make adjustment easier.

  In order to solve the above-described problems, the present invention provides an apparatus for exchanging a component suction nozzle provided in a movable head unit mounted on a mounting machine for mounting a component in a movable region of the head unit. A nozzle storage unit for storing a replacement nozzle, a nozzle sensor for detecting the presence or absence of a nozzle in the nozzle storage unit, and a control means for controlling the operation of the nozzle sensor. The nozzle sensor comprises a transmissive optical sensor that detects the presence or absence of a nozzle present between the light projecting unit and the light receiving unit, and the control means is in a state in which no nozzle is present in the nozzle storage unit. By turning ON / OFF the light projecting portion of the nozzle sensor, a state where the light from the light projecting portion is received by the light receiving portion and a state where the light is not received is created. , And it is characterized in that it is configured to adjust the sensor sensitivity based on the detected value of the light receiving portion under the two states (claim 1).

  According to the present invention, the light projecting portion of the nozzle sensor is turned ON / OFF based on control by the control means, thereby creating a state where the nozzle is virtually present and a state where the nozzle is not present (that is, from the light projecting portion). The sensor sensitivity is adjusted based on the detected value of the light receiving unit under each of these conditions, virtually creating a state where the irradiation light is blocked by the nozzle and a state reaching the light receiving unit without being blocked) In order to perform the sensitivity adjustment, it is not necessary to actually insert and remove the nozzles from the nozzle storage portion one by one, and the sensitivity adjustment of the nozzle sensor can be performed more easily.

  As a control for adjusting the sensor sensitivity, the control means sets the threshold value of the detection value of the light receiving unit, which is a criterion for determining the presence or absence of the nozzle, to the detection value of the light receiving unit in each state when the light projecting unit is ON / OFF. It is preferable to perform control for resetting based on (claim 2).

  In this way, the threshold value can be easily set based on the detection value of the light receiving unit in each state when the light projecting unit is ON / OFF, and thereafter, the appropriate value based on the new threshold value is set. There is an advantage that the presence or absence of the nozzle can be detected with high sensitivity.

  The control means preferably performs the sensor sensitivity adjustment control periodically during operation of the mounting machine.

  In this way, the sensitivity of the nozzle sensor can always be maintained in an appropriate state during operation of the mounting machine, and the replacement operation of the nozzle can be performed more reliably while properly detecting the presence or absence of the nozzle by such a nozzle sensor. There is an advantage that can be done.

  The control means preferably performs a predetermined notification that prompts an operator to perform maintenance of the nozzle sensor when the threshold value of the reset detection value is smaller than a preset limit value.

  In this way, it is possible to effectively avoid that the threshold value is reduced excessively and the detection of the nozzles is not performed properly, and the sensitivity of the nozzle sensor can always be maintained in a good state while appropriately performing necessary maintenance. There is.

  The present invention is also a mounting machine in which a nozzle for component suction is detachably provided on a movable head unit, and the nozzle replacement unit as described above is provided in a movable region of the head unit. (Claim 5).

  According to the present invention, the sensitivity of the nozzle replacement unit can be easily adjusted, and the nozzle replacement can be reliably performed while properly detecting the presence or absence of the nozzle by the nozzle replacement unit.

  Furthermore, the present invention is provided as a device for replacing a suction nozzle provided in a movable head unit mounted on a mounting machine for mounting a component, and a nozzle storage portion in which the replacement nozzle is stored; Nozzle replacement having a nozzle sensor for detecting the presence or absence of a nozzle in the nozzle housing portion, and having a transmission type optical sensor for detecting the presence or absence of a nozzle present between the light projecting portion and the light receiving portion as the nozzle sensor A method of adjusting the sensitivity of the nozzle sensor in the unit, wherein the light projecting unit is turned on / off in a state where no nozzle is present in the nozzle housing unit, so that light from the light projecting unit is transmitted to the light receiving unit. A state in which light is received and a state in which light is not received are created, and sensor sensitivity is adjusted based on detection values of the light receiving unit under these two states. Than it (claim 6).

  According to this method, the sensitivity adjustment of the nozzle sensor can be performed more easily.

  As described above, according to the present invention, the sensitivity adjustment of the nozzle sensor can be performed more easily.

  FIG. 1 schematically shows the overall configuration of a mounting machine according to an embodiment of the present invention. In the figure, a substrate conveying conveyor 2 is arranged on a base 1 of a mounting machine, and a printed circuit board 3 indicated by a two-dot chain line is conveyed on the conveyor 2 and stops at a predetermined mounting position. ing.

  On the side of the conveyor 2, a component supply unit 4 including multiple rows of tape feeders 4 a is arranged. Each of the tape feeders 4a of the component supply unit 4 is configured to store electronic components such as ICs, transistors, capacitors, and the like at predetermined intervals and lead out the held tapes from the reels. The feeding of the tape by the tape feeder 4a is controlled by a ratchet type feeding mechanism (not shown), and the tape is intermittently fed in accordance with the picking up of the parts by the head unit 5 described later. Yes.

  Above the base 1, a component mounting head unit 5 is provided. The head unit 5 has an X-axis direction (conveying direction of the conveyor 2) and a Y-axis direction (a direction perpendicular to the X-axis on a plane). Configured to move to.

  Specifically, a pair of rails 6 extending in the Y-axis direction are extended on the base 1, and a head unit support member 7 is installed on both rails 6. The head unit support member 7 is screwed with a ball screw shaft 9 via a nut portion 8, and the ball screw shaft 9 is connected to a rotation shaft of a Y-axis servo motor 10. The head unit support member 7 has a guide member 11 extending in the X-axis direction, and the head unit 5 is movable along the guide member 11. Then, by driving the X-axis servo motor 12, the head unit 5 is moved in the X-axis direction via a ball screw shaft (not shown).

  The head unit 5 is mounted with a plurality of mounting heads 20 for sucking components and mounting them on the printed circuit board 3. In this embodiment, the six mounting heads 20 are arranged in a row in the X-axis direction. It is mounted side by side. These mounting heads 20 are driven in the vertical direction (Z-axis direction) by an elevating drive mechanism using a Z-axis servomotor (not shown) as a drive source, and an R-axis servomotor (not shown) as a drive source. It is configured to be driven in a rotation direction (R axis direction) about the Z axis by a rotating drive mechanism.

  Further, a nozzle 21 for picking up components (shown in FIG. 6) is provided at the tip of each mounting head 20, and when the components are taken out from the tape feeder 4a, the tip of the nozzle 21 is not shown. A negative pressure is supplied from the negative pressure supply means, and parts are adsorbed by this negative pressure.

  As shown in FIGS. 6A and 6B, the nozzle 21 is detachably attached to the mounting head 20. That is, the tip portion (lower end portion) of the mounting head 20 is provided with a shaft portion 20a for externally mounting the nozzle 21 and a pair of plate springs 20b for holding the nozzle, and the shaft portion 20a. Is inserted into the nozzle 21 from above, and the leaf spring 20b is elastically engaged with the engaged portion 21a formed at the upper end of the nozzle 21, whereby the nozzle 21 is brought into contact with the tip of the mounting head 20. It is supposed to be retained. On the other hand, when an external force larger than the elastic force of the leaf spring 20b acts on the nozzle 21 in the nozzle pulling direction, the nozzle 21 is separated from the mounting head 20 accordingly.

  In the mounting machine configured as described above, the head unit 5 moves between the printed circuit board 3 positioned at a predetermined work position and the component supply unit 4 in a normal state, so that each mounting head 20 is moved. The components are picked up from the component supply unit 4 by the nozzle 21 and conveyed onto the printed circuit board 3, and the components are sequentially mounted at predetermined positions on the circuit board 3. When necessary, the nozzle 21 of the mounting head 20 is replaced with a new nozzle 21 by the nozzle replacement unit 19 (FIG. 1) installed in the movable region of the head unit 5. The above-described component mounting operation can be performed while the replacement is appropriately performed.

  2 to 4 show a specific configuration of the nozzle replacement unit 19. 2 is a plan view of the nozzle replacement unit 19, FIG. 3 is a side sectional view of the unit 19, and FIG. 4 is a plan sectional view of the unit 19. As shown in these drawings, the nozzle replacement unit 19 has a nozzle storage portion 30 for storing a plurality of replacement nozzles 21, and a shutter member 32 supported slidably along the upper surface thereof. ing. In the nozzle replacement unit 19 of this embodiment, as shown in FIGS. 2 and 4, a total of 32 nozzles 21 of 8 × 4 rows can be stored in the nozzle storage portion 30.

  As shown in FIGS. 2 and 3, the nozzle storage portion 30 is provided with a plurality of nozzle storage holes 31 for storing the nozzles 21, and the nozzles 21 are provided in the nozzle storage holes 31. Each is housed in a state of being inserted from the front end side (lower end side). 3 shows a state in which the nozzles 21 are stored only in some of the nozzle storage holes 31 for convenience.

  The nozzle housing portion 30 has a two-part structure having an upper housing 28 and a lower housing 29. In a space C formed between the housings 28 and 29, a nozzle sensor 40 and a later-described The control means 36 is accommodated.

  2 and 3, the shutter member 32 includes a plurality of circular notches 34 having a diameter slightly larger than the large diameter portion 21b of the nozzle 21 (the portion constituting the outermost peripheral portion of the nozzle 21). A plurality of elongated slits 33 formed by alternately connecting a plurality of narrow notches 35 having a constant width narrower than the large-diameter portion 21b at predetermined intervals are provided along the arrangement direction of the nozzles 21. It is comprised from the plate material provided in the row | line | column. Such a shutter member 32 is slidably driven along the upper surface of the nozzle accommodating portion 30 so that the circular notch 34 is located at the installation portion of each nozzle accommodating hole 31 as shown in FIG. It is configured to be displaced between an open state as shown in FIG. 5 and a closed state as shown in FIG. 5 in which the narrow notch 35 is located at the installation portion of each nozzle housing hole 31.

  That is, when the shutter member 32 is set in the open state, as shown in FIG. 6A, the upper portion of the nozzle housing hole 31 is opened through the circular cutout portion 34, and the nozzle 21 corresponding to the nozzle housing hole 31 is opened. When the shutter member 32 is set in a closed state, the peripheral portion of the narrow notch 35 is formed on the large-diameter portion 21b of the nozzle 21 as shown in FIG. By covering the upper side, the vertical movement of the nozzle 21 is restricted.

  As shown in FIGS. 3 and 4, a CPU for controlling the operation of the shutter member 32 and the like are provided in the nozzle storage portion 30 (the space C between the upper and lower housings 28 and 29). Control means 36 comprising a control board provided with a memory or the like is provided. The control means 36 is electrically connected to a body-side control means (not shown) for controlling the operation and the like of the head unit 5 of the mounting machine, and interlocks with the operation of each mounting head 20 of the head unit 5. Thus, the shutter member 32 is driven and controlled. Then, the operations of the shutter member 32 and the mounting head 20 are controlled in this way, so that the replacement work of the nozzle 21 is advanced as follows, for example.

  First, the head unit 5 is disposed above the nozzle replacement unit 19, and the mounting head 20 to be replaced is positioned above the empty space in the nozzle housing hole 31. After the shutter member 32 in the nozzle replacement unit 19 is set in the open state, the mounting head 20 is lowered and the nozzle 21 at the tip thereof is inserted into the nozzle housing hole 31 as shown in FIG. Is done.

  Next, when the shutter member 32 is switched to the closed state, as shown in FIG. 6B, the large-diameter portion 21b of the nozzle 21 is locked by the shutter member 32 (the peripheral portion of the narrow notch portion 35). In this state, the mounting head 20 is raised. As a result, the nozzle 21 is separated from the mounting head 20 and left in the nozzle housing hole 31, and the removal of the nozzle 21 is completed.

  When the nozzle 21 is removed from the mounting head 20 as described above, a new nozzle 21 is next attached to the mounting head 20 according to the reverse operation. That is, after the mounting head 20 is positioned above the nozzle storage hole 31 in which the nozzle 21 to be mounted is stored in the nozzle storage hole 31, the mounting head 20 is lowered, whereby the mounting head 20 The nozzle 21 is attached to the tip of the head 20. Specifically, the mounting head 20 is lowered and the shaft portion 20a is inserted into the nozzle 21, and the plate spring 20b at the tip of the mounting head 20 is gradually moved by the engaged portion 21a of the nozzle 21. To be expanded. Then, in a state where the shaft portion 20 a is completely inserted into the nozzle 21, the engaged portion 21 a is elastically clamped by the leaf spring 20 b, so that the nozzle 21 is held at the tip of the mounting head 20. .

  Finally, the shutter member 32 is switched to the open state, and the mounting head 20 is raised in this state, so that the nozzle 21 is taken out from the nozzle housing hole 31 while being mounted on the mounting head 20, Thus, the replacement of the nozzle 21 is completed.

  By the way, when the nozzle 21 is replaced as described above, the presence or absence of the nozzle 21 accommodated in each nozzle accommodation hole 31 is detected by the nozzle sensor 40 shown in FIGS. 3 and 4. . Based on the detection result, a determination is made as to which nozzle storage hole 31 the replacement nozzle 21 is present, whether or not the replacement of the nozzle 21 has been performed without error, and the like. Yes.

  The nozzle sensor 40 includes a light projecting unit 38 composed of a light emitting source such as a light emitting diode (LED) and a light receiving unit 39 composed of a light receiving element such as a phototransistor that receives light emitted from the light projecting unit 38. In addition, it is configured to detect the presence or absence of the nozzle 21 that is housed in the nozzle housing hole 31 and exists between the light projecting unit 38 and the light receiving unit 39. The light projecting section 38 and the light receiving section 39 are installed on the control means 36 in the nozzle storage section 30, respectively, and are configured to be controlled by the control means 36.

  As shown in FIG. 3, a light guide path 44, which is a path for light irradiated from the light projecting unit 38 and reaching the light receiving unit 39, penetrates the upper housing 28 in the nozzle housing unit 30. Is provided. The light guide path 44 includes a first vertical passage 44a extending upward from above the installation portion of the light projecting section 38, a horizontal passage 44b extending in the horizontal direction from the upper end portion of the first vertical passage 44a, and the horizontal passage 44b. It consists of a crank-shaped through passage extending downward from the distal end portion and having a second vertical passage 44c whose distal end opens toward the light receiving portion 39. The installation portion of the light projecting portion 38 and the light receiving portion 39 The installation portion communicates with each other through these passages 44a to 44c.

  Each corner of the light guide 44 reflects light to the corners, more specifically, the connecting portion between the first vertical passage 44a and the horizontal passage 44b, and the connecting portion between the horizontal passage 44b and the second vertical passage 44c. Reflecting mirrors 45 and 46 for refracting are provided. The light emitted from the light projecting unit 38 travels toward the light receiving unit 39 while being refracted twice along the light guide path 44 extending in a crank shape due to the presence of the reflecting mirrors 45 and 46.

  Then, as described above, the light emitted from the light projecting unit 38 and traveling in the light guide path 44 is blocked by the nozzle 21 housed in the nozzle housing hole 31 existing in the middle thereof, thereby the nozzle 21. The presence of is detected.

  Specifically, when light is emitted from the light projecting unit 38, the emitted light reaches the light receiving unit 39 through the light guide path 44 in a state where the nozzle 21 does not exist in the nozzle housing hole 31. On the other hand (see the nozzle sensor 40 on the right side of FIG. 3), when the nozzle 21 is present in the nozzle housing hole 31, the light from the light projecting unit 38 is blocked by the nozzle 21 before reaching the light receiving unit 39. (Refer to the nozzle sensor 40 on the left side of FIG. 3). Then, when the light from the light projecting unit 38 reaches the light receiving unit 39 or is interrupted in the middle as described above, the amount of light received by the light receiving unit 39 is changed, and the above-described change is made based on the change in the received light amount. The presence or absence of the nozzle 21 is detected.

  That is, in the light receiving unit 39 formed of a light receiving element such as a phototransistor, an electromotive current is generated by photoelectric conversion, and the value of this electromotive current is the arrival / blocking of light (that is, the amount of received light) Change). The magnitude of the electromotive current of the light receiving portion 39 is recognized by the control means 36, and the control means 36 is configured to determine the presence or absence of the nozzle 21 according to the magnitude of the electromotive current.

  Specifically, the control means 36 determines that the nozzle 21 does not exist when the value of the electromotive current of the light receiving unit 39 (that is, the detection value of the light receiving unit 39) is smaller than a preset threshold value, and detects the detection. When the value is larger than the threshold value, it is determined that the nozzle 21 exists. This determination result is output to the main body side control means for controlling the operation and the like of the head unit 5, and the main body side control means determines the type and quantity of the nozzle 21 currently taken out from the nozzle replacement unit 19. Based on the above results.

  As shown in FIGS. 3 and 4, an indicator light emitting unit 42 that irradiates light to the outside of the nozzle storage unit 30 according to the presence or absence of the nozzle 21 is provided outside the light projecting unit 38 of the nozzle sensor 40. It has been. 3, the light emitting unit 42 is turned off when the nozzle 21 is present in the nozzle housing hole 31 (see the light emitting unit 42 on the left side in the drawing), and is turned on when the nozzle 21 is not present. (Refer to the light emitting section 42 on the right side in the figure). The upper housing 28 of the nozzle storage unit 30 is provided with a light guide path 47 for passing indicator light emitted from the light emitting unit 42 to the outside.

  By the way, in the nozzle replacement unit 19 configured as described above, the sensitivity of the nozzle sensor 40 gradually changes (deteriorates) due to dust adhering to the light projecting unit 38 and the light receiving unit 39. For this reason, it is desirable that the sensitivity of the nozzle sensor 40 be regularly adjusted during operation of the mounting machine.

  That is, in FIG. 8, if the threshold value of the detection value of the light receiving unit 39 that is a criterion for determining the presence or absence of the nozzle 21 is α, the threshold value α is calculated when the nozzle 21 is not present in the nozzle housing hole 31. The detection value (maximum detection value L) when the irradiation light from the light unit 38 is received by the light receiving unit 39 and the irradiation light from the light projecting unit 38 are almost received by the light receiving unit 39 because the nozzle 21 is present. Is set to a predetermined value between the detection value (minimum detection value S) and the maximum / minimum detection values L and S of the light receiving unit 39 change over time due to the dust and the like. Therefore, it is necessary to periodically reset the threshold value α in accordance with this. Therefore, in the nozzle replacement unit 19, the value of the threshold value α is periodically adjusted during operation of the mounting machine, so that the sensor sensitivity is always kept in an appropriate state. In the present embodiment, the threshold value α of the detection value is set to an average value (intermediate value between L and S) of the maximum / minimum detection values L and S.

  As to how much the maximum / minimum detection values L and S in the light receiving section 39 are changed, as shown in FIGS. 7A and 7B, the nozzle 21 is not present in the nozzle housing hole 31 as described above. By turning ON / OFF (lighting / extinguishing) the light projecting unit 38, a state in which the light from the light projecting unit 38 is received by the light receiving unit 39 and a state in which the light is not received are created (that is, the nozzle 21 is in the nozzle housing hole 31). It can be obtained by virtually creating a state that exists in the inside and a state that does not exist in the inside and examining the detection value of the light receiving unit 39 in each state. The threshold value α is adjusted based on the maximum / minimum detection values L and S of the light receiving unit 39. For example, as shown in FIG. 9, if the maximum detection value of the light receiving unit 39 decreases from L → L ′ and the minimum detection value decreases from S → S ′, the threshold value α is set to the detection value L ′ after the decrease. , S ′, the threshold value α ′ is reset.

  Moreover, the line | wire with code | symbol (beta) in FIG. 9 has shown the limit value of the said threshold value (alpha). And when the said threshold value (alpha) falls to the value below this limit value (beta), it is comprised so that the alarm for a warning may be emitted. As a result, the operator is notified that maintenance such as removal of dust attached to the nozzle sensor 40 should be performed.

  The sensitivity adjustment of the nozzle sensor 40 as described above is automatically executed based on the control by the control means 36 during the operation of the mounting machine. The contents of the sensor sensitivity adjustment control performed by the control means 36 will be described below based on the flowchart shown in FIG.

  When the control operation of FIG. 10 starts, first, the control means 36 activates the nozzle sensor 40 that should perform sensitivity adjustment, and determines whether or not the nozzle 21 exists in the nozzle housing hole 31 corresponding to the nozzle sensor 40. The control to detect is executed (step S1). Then, when it is determined NO and it is confirmed that the nozzle 21 does not exist in the nozzle housing hole 31, control for calculating a temporary value (temporary threshold) of the threshold value α regarding the sensitivity of the nozzle sensor 40 is performed. Is executed (step S3). On the other hand, if it is determined YES in step S1 and it is confirmed that the nozzle 21 is present in the nozzle housing hole 31, the process returns as it is, that is, until the nozzle 21 is taken out from the nozzle housing hole 31, that is, the nozzle 21. Waits until it is picked up by the mounting head 20.

  FIG. 11 is a subroutine showing specific contents of the temporary threshold value calculation control of the sensitivity of the nozzle sensor 40 performed in step S3. When this subroutine is started, as shown in FIG. 7A, the control means 36 turns on (lights up) the light projecting section 38 of the corresponding nozzle sensor 40 and receives the irradiation light from the light projecting section 38 as a light receiving section. 39 (step S31), and executes control for storing the detected value of the light receiving unit 39 at this time as the maximum detected value L ′ shown in FIG. 9 (step S33). FIG. 7 shows a state where the nozzles 21 are taken out from the plurality of nozzle housing holes 31. In such a state, it is possible to simultaneously adjust the sensitivity for the plurality of nozzle sensors 40. For this reason, FIG. 7A shows a state where light is simultaneously irradiated from the light projecting portions 38 of the plurality of nozzle sensors 40.

  Next, as shown in FIG. 7B, the control means 36 turns off the light projecting portion 38 of the nozzle sensor 40 so that the light receiving portion 39 does not receive light (step S35). Control is performed to store the detection value of the light receiving unit 39 at this time as the minimum detection value S ′ shown in FIG. 9 (step S37).

  Then, based on the maximum / minimum detection values L ′ and S ′ obtained as described above, control for calculating a temporary threshold value α ′ composed of an intermediate value obtained by averaging these two values is executed (step S39). ), The sub-threshold value calculation control subroutine is completed.

  Returning again to the main flow of FIG. When the sensitivity adjustment of the nozzle sensor 40 is completed, the control means 36 executes control for determining whether or not the temporary threshold value α ′ calculated in step S39 has changed by a specified amount or more (step S5). . Specifically, it is determined whether or not the temporary threshold value α ′ has changed by a predetermined ratio (for example, 10%) or more compared to the original threshold value.

  When it is determined YES in step S5 and it is confirmed that the temporary threshold α ′ has changed to a specified amount or more, is the temporary threshold α ′ equal to or less than the limit value β shown in FIG. It is further determined whether or not (step S7). When it is determined NO and it is confirmed that the temporary threshold value α ′ is larger than the limit value β, the temporary threshold value α ′ is reset as a new threshold value. Control is performed (step S9).

  On the other hand, if it is determined as YES in step S7 and it is confirmed that the temporary threshold value α ′ is equal to or less than the limit value β, control for issuing an alarm for warning to prompt the operator to maintain the nozzle sensor 40 is performed. Is executed (step S11).

  If it is determined NO in step S5 and it is confirmed that the change amount of the temporary threshold value α 'is smaller than the specified amount, it is determined that the resetting of the threshold value α is unnecessary and the process returns as it is.

  As described above, a nozzle sensor comprising a nozzle housing part 30 in which the replacement nozzle 21 is housed, and a transmission type optical sensor for detecting the presence or absence of the nozzle 21 in the nozzle housing part 30 (nozzle housing hole 31 thereof). 40 and a control means 36 for controlling the operation of the nozzle sensor 40, the nozzle sensor is operated in a state where the nozzle 21 is not present in the nozzle housing hole 31 under the control of the control means 36. By turning ON / OFF the 40 light projecting units 38, a state in which the light from the light projecting unit 38 is received by the light receiving unit 39 and a state in which the light is not received are created, and the light receiving unit 39 under these two states is created. According to the configuration of the above embodiment in which the sensor sensitivity is adjusted based on the detected value, the sensitivity of the nozzle sensor 40 that detects the presence or absence of the nozzle 21 There is the advantage that it is possible to perform an integer more easily.

  That is, in the above-described embodiment, the light emitting unit 38 of the nozzle sensor 40 is turned ON / OFF based on the control by the control unit 36, thereby creating a state where the nozzle 21 is virtually present and a state where the nozzle 21 is not present (that is, Based on the detection value of the light receiving unit 39 under each of these states, a state where the irradiation light from the light projecting unit 38 is blocked by the nozzle 21 and a state where it reaches the light receiving unit 39 without being blocked) is virtually created. Therefore, it is not necessary to actually insert and remove the nozzle 21 from the nozzle housing hole 31 to perform the sensitivity adjustment, and the sensitivity adjustment of the nozzle sensor 40 can be performed more easily. In particular, when the number of nozzles 21 that can be stored in the nozzle storage unit 30 is large as in the above-described embodiment, sensitivity adjustment can be performed on more nozzle sensors 40 at the same time. There is an advantage that the sensor sensitivity can be adjusted.

  Specifically, in the above-described embodiment, as control for adjusting the sensor sensitivity, the threshold value α of the detection value of the light receiving unit 39 that is a determination criterion for the presence or absence of the nozzle 21 is set to each state when the light projecting unit 38 is ON / OFF. The detection value of the light receiving unit 39 in FIG. 9, that is, the detection value of the light receiving unit 39 due to dust adhering to the nozzle sensor 40 is reset based on the maximum / minimum detection values L ′ and S ′ shown in FIG. Even when the value changes over time, it is possible to easily reset the appropriate threshold value α ′ taking such changes into account, and thereafter, the appropriate sensitivity based on the new threshold value α ′. There is an advantage that the presence or absence of the nozzle 21 can be detected.

  In particular, when the control for adjusting the sensor sensitivity is performed periodically during the operation of the mounting machine as in the above embodiment, the sensitivity of the nozzle sensor 40 is increased during the operation of the mounting machine. There is an advantage that the nozzle 21 can be always maintained in an appropriate state, and the replacement operation of the nozzle 21 can be performed more reliably while properly detecting the presence or absence of the nozzle 21 by the nozzle sensor 40.

  Furthermore, according to the above configuration in which the sensor sensitivity can be adjusted in the absence of the nozzle 21, the nozzle replacement unit 19 is mounted in advance before the nozzle replacement unit 19 is attached to the mounting machine (that is, in the state of the nozzle replacement unit 19 alone). It is also possible to adjust the sensitivity of the sensor 40. In this way, there is an advantage that it is not necessary to adjust the nozzle sensor 40 when operating the mounting machine for the first time, and the mounting machine can be started more smoothly.

  In the above embodiment, when it is confirmed that the threshold value α ′ of the detection value reset by the sensitivity adjustment is smaller than the predetermined limit value β, the maintenance of the nozzle sensor 40 is urged to the operator. Since the predetermined notification (alarm for warning) is performed, it is possible to effectively avoid the threshold value α ′ from being unnecessarily lowered and the detection of the nozzle 21 from being performed properly, and necessary maintenance. There is an advantage that the sensitivity of the nozzle sensor 40 can always be maintained in a good state while appropriately performing the above.

  In the above-described embodiment, the nozzle sensor 40 for detecting the presence or absence of the nozzle 21 is configured by the light projecting unit 38 made of a light emitting diode (LED) or the like and the light receiving unit 39 made of a phototransistor or the like. The type of the nozzle sensor 40 in the invention is not limited as long as it is a transmissive optical sensor. For example, the nozzle sensor 40 may be configured by a transmission type laser sensor using laser light.

It is a top view which shows the whole structure of the mounting machine concerning embodiment of this invention. It is a top view for demonstrating the whole structure of the nozzle exchange unit provided in the said mounting machine. It is side surface sectional drawing along the III-III line of FIG. FIG. 4 is a plan sectional view taken along line IV-IV in FIG. 3. It is a figure for demonstrating the state which the shutter member in the said nozzle exchange unit displaced to the closed state. It is a figure for demonstrating the procedure of the nozzle replacement | exchange operation | work in the said nozzle replacement | exchange unit. It is a figure for demonstrating the procedure of the sensitivity adjustment of the nozzle sensor performed with the said nozzle replacement unit. It is a figure for demonstrating the relationship between the threshold value of the detection value of the light-receiving part in the said nozzle sensor, and the maximum and minimum detection value. It is a figure which shows the mode of the change of the threshold value of the said detection value, and the maximum / minimum detection value. It is a main flowchart which shows the control content at the time of adjusting the sensitivity of the said nozzle sensor regularly. 11 is a subroutine showing specific contents of provisional threshold value calculation control of the sensitivity of the nozzle sensor performed in the flowchart of FIG. 10.

Explanation of symbols

5 Head unit 19 Nozzle replacement unit 21 Nozzle 30 Nozzle storage part 36 Control means 38 Light projecting part 39 Light receiving part 40 Nozzle sensor α, α 'Threshold value β Limit value

Claims (6)

A nozzle exchange unit provided in a movable region of the head unit as a device for exchanging a nozzle for component adsorption provided in a movable head unit mounted on a mounting machine for mounting components,
A nozzle storage section for storing a replacement nozzle;
A nozzle sensor that detects the presence or absence of a nozzle in the nozzle housing;
Control means for controlling the operation of the nozzle sensor,
The nozzle sensor comprises a transmissive optical sensor that detects the presence or absence of a nozzle present between the light projecting unit and the light receiving unit,
The control means turns on / off the light projecting portion of the nozzle sensor in a state where there is no nozzle in the nozzle housing portion, so that light from the light projecting portion is not received and received by the light receiving portion. The nozzle replacement unit is configured to create a state and adjust the sensor sensitivity based on the detection value of the light receiving unit under these two states. The nozzle replacement unit according to claim 1,
As a control for adjusting the sensor sensitivity, the control means sets the threshold value of the detection value of the light receiving unit, which is a criterion for determining the presence or absence of the nozzle, to the detection value of the light receiving unit in each state when the light projecting unit is ON / OFF. A nozzle replacement unit that performs control to be reset based on the setting. The nozzle replacement unit according to claim 2,
The nozzle replacement unit according to claim 1, wherein the control means periodically performs adjustment control of the sensor sensitivity during operation of the mounting machine. The nozzle replacement unit according to claim 3,
The nozzle replacement unit according to claim 1, wherein the control means performs a predetermined notification that prompts an operator to perform maintenance of the nozzle sensor when a threshold value of the reset detection value is smaller than a preset limit value. A mounting machine in which a nozzle for component suction is detachably provided on a movable head unit, and a nozzle replacement unit for replacing the nozzle is provided in a movable region of the head unit,
A mounting machine comprising the nozzle replacement unit according to any one of claims 1 to 4 as the nozzle replacement unit. Provided as a device for replacing the suction nozzles provided in the movable head unit mounted on the mounting machine for mounting the components, the nozzle storage part for storing the replacement nozzles and the nozzles in the nozzle storage part A nozzle sensor that detects the presence or absence of the nozzle sensor, and the sensitivity of the nozzle sensor in a nozzle replacement unit that includes a transmissive optical sensor that detects the presence or absence of a nozzle that exists between the light projecting unit and the light receiving unit. Is a method of adjusting
By turning the light projecting unit ON / OFF in a state where there is no nozzle in the nozzle housing unit, a state where light from the light projecting unit is received by the light receiving unit and a state where no light is received is created. A nozzle sensor adjustment method for a nozzle replacement unit, wherein the sensor sensitivity is adjusted based on a detection value of the light receiving unit under conditions.