JP2014183243A - Height detection method for mounting head in electronic component mounting device, and electronic component mounting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely mount an electronic component by computing a head height offset value in a structure as simple as possible so as to vary a stroke of a mounting head taking inclination of a substrate or inclination of a conveyance chute into account.SOLUTION: A master nozzle 40 is moved down to a position detectable for a line sensor unit 16 provided in a mounting head 9A, a position of a flange surface 40A of the master nozzle is detected, and a detection value of the position is stored in a storage device 21. The mounting head 9A is moved down, the master nozzle 40 is abutted to a top face of a conveyance chute 5B2 via a notch 13 formed in a lock part 5B2 and when a detection value by the line sensor unit 16 is different from the detection value stored by the storage device 21, thee mounting head 9A is stopped being moved down. A differential between a height position of the mounting head 21 at the time of stop and a designed height value is stored in the storage device 21 as a height offset value. This operation is repeated for each of a plurality of notches 13 formed in the lock part 5B2.

Description

  According to the present invention, a locking plate is fixed to the upper surface of a conveyance shunt that conveys and guides a substrate, and the upper surface of the substrate that has been raised when the substrate is positioned contacts and locks the locking plate. The mounting head height detecting method and the electronic component in the electronic component mounting apparatus for mounting the electronic component held by the component holder provided on the mounting head onto the substrate in a state of being locked by the locking plate The present invention relates to a mounting device.

  For example, in Patent Document 1 and the like, detection coordinate data relating to a large number of detection positions when the height detection device detects the height level of the printed circuit board positioned by the substrate positioning unit by the height detection device is stored in the storage device. A technique for detecting the height level of the printed circuit board at the detection position and changing the descending stroke of the suction nozzle is disclosed.

  In general, the mounting height for mounting electronic components on a printed circuit board, which is a substrate, is mounted using a master nozzle and jig substrate when making adjustments in-house by a manufacturer or when installing by a user after shipment. The height is confirmed, stored as a head height offset value in the storage device of the electronic component mounting apparatus, and the height offset value is used when mounting the electronic component on the printed circuit board.

JP 2008-166472 A

  However, one head height offset value is provided for each mounting head, but it is made to follow the mounting height according to the inclination and unevenness of the entire range of the printed circuit board to be mounted while being fixed to the conveyance chute. The stroke of the mounting head cannot be changed. For this reason, the mounting load applied to the electronic component is not constant, and the electronic component may be cracked or mounted.

  Therefore, the present invention obtains the head height offset value by a simple method and structure as much as possible, and makes the mounting head stroke variable in consideration of the inclination of the board and the inclination of the transfer chute, etc., to ensure the mounting of electronic components. The purpose is to.

Therefore, according to the first aspect of the present invention, the locking plate is fixed to the upper surface of the conveyance shunt that conveys and guides the substrate, and the upper surface of the substrate raised during the positioning of the substrate comes into contact with the locking plate. Detecting the height of the mounting head in the electronic component mounting apparatus that mounts the electronic component held by the component holder provided on the mounting head on the substrate in a state of being locked by the locking plate. In the method
A master holder is attached to the mounting head instead of the component holder,
The height position of the master holder is detected by a height detection device provided in the mounting head, and the detected value is stored in the first storage device,
The mounting head is lowered and the master holder comes into contact with the upper surface of the conveyance chute through a notch formed in the locking plate, and the detection value by the height detection device is stored in the first storage device. If the detected value is different from the detected value, the lowering of the mounting head is stopped, and the difference between the height position of the mounting head and the designed height position at the time of the stop is set as a height offset value in the second storage device. Is stored for each of the plurality of notches formed in the locking plate.

According to a second aspect of the present invention, a locking plate is fixed to the upper surface of a conveyance shunt that conveys and guides a substrate, and the upper surface of the substrate that has been raised during the positioning of the substrate contacts and locks the locking plate. In the mounting head height detection method in the electronic component mounting apparatus for mounting the electronic component held by the component holder provided on the mounting head on the substrate in a state of being locked by the locking plate. ,
A master holder is attached to the mounting head instead of the component holder,
The detected value detected by the height detection device provided in the mounting head by lowering the master holder to a position that can be detected by the height detection device provided in the mounting head. In the first storage device,
The mounting head is lowered and the master holder comes into contact with the upper surface of the conveyance chute through a notch formed in the locking plate, and the detection value by the height detection device is stored in the first storage device. If the detected value is different from the detected value, the lowering of the mounting head is stopped, and the difference between the height position of the mounting head and the designed height position at the time of the stop is set as a height offset value in the second storage device. Is stored for each of the plurality of notches formed in the locking plate.

According to a third aspect of the present invention, a locking plate is fixed to the upper surface of the conveyance shunt that conveys and guides the substrate, and the upper surface of the substrate raised during positioning of the substrate comes into contact with the locking plate and is locked. In the electronic component mounting apparatus for mounting the electronic component held by the component holder provided on the mounting head on the substrate in a state of being locked by the locking plate,
A master holder attached to the mounting head instead of the component holder;
A height detection device provided on the mounting head for detecting the height of the master holder,
A first storage device for storing the detected value of the height detected by the height detection device;
The mounting head is lowered and the master holder comes into contact with the upper surface of the conveyance chute through a notch formed in the locking plate, and the detection value by the height detection device is stored in the first storage device. A control device that controls to stop the lowering of the mounting head if the detected value is different from the detected value;
A calculation device for obtaining a difference between the height position of the mounting head and the design height position at the time of stopping;
A second storage device that stores the difference calculated by the calculation device as a height offset value;
The operation of obtaining the difference and storing it as a height offset value is repeated for each of the plurality of notches formed in the locking plate.

According to a fourth aspect of the present invention, a locking plate is fixed to an upper surface of a conveyance shunt that conveys and guides a substrate, and the upper surface of the substrate that has been raised during the positioning of the substrate comes into contact with the locking plate to be locked. In the electronic component mounting apparatus for mounting the electronic component held by the component holder provided on the mounting head on the substrate in a state of being locked by the locking plate,
A master holder attached to the mounting head instead of the component holder;
A height detection device provided on the mounting head for detecting the height of the master holder,
A first controller that controls the master holder to be lowered to a position that can be detected by the height detector;
A first storage device that stores the detected value detected by the height detection device with the height of the master holder lowered to the position that can be detected by the control of the first control device;
The mounting head is lowered and the master holder comes into contact with the upper surface of the conveyance chute through a notch formed in the locking plate, and the detection value by the height detection device is stored in the first storage device. A second control device that controls to stop the lowering of the mounting head if it is different from the detected value,
A calculation device for obtaining a difference between the height position of the mounting head and the design height position at the time of stopping;
A second storage device that stores the difference calculated by the calculation device as a height offset value;
The operation of obtaining the difference and storing it as a height offset value is repeated for each of the plurality of notches formed in the locking plate.

  The present invention obtains the head height offset value of the mounting head with the simplest possible method and structure, and makes the mounting head stroke variable in consideration of the inclination of the substrate and the inclination of the transport chute, etc. Can be made.

It is a schematic plan view of an electronic component mounting apparatus. It is the left view which longitudinally cut the conveyance chute of the electronic component mounting apparatus. It is a top view of a conveyance chute. It is a control block diagram of an electronic component mounting apparatus. It is the state which lowered the master nozzle of the electronic component mounting apparatus, Comprising: It is the left view which carried out the conveyance chute longitudinally.

  Mounting work devices that perform a predetermined operation for mounting electronic components on a substrate include, for example, a screen printing device that applies a solder paste onto a printed circuit board, an adhesive application device that applies an adhesive onto the printed circuit board, and a printed circuit board. An electronic component mounting apparatus for mounting an electronic component is described below. An embodiment of the present invention will be described below with reference to FIG. 1 for an electronic component mounting apparatus 1 as an example of the mounting work apparatus.

  On the upstream side of the electronic component mounting device 1, for example, an upstream device 2 such as the adhesive application device including the transport conveyor 2A, and on the downstream side, for example, an electronic component mounting device including the transport conveyor 3A. A downstream device 3 is provided.

  The electronic component mounting apparatus 1 includes a transport device 5 that transports the printed circuit boards P in parallel, and component supply devices 6A and 6B that are disposed on the front side and the back side of the device main body and supply electronic components. , A pair of beams 7A and 7B that are movable in one direction (reciprocating in the Y direction, which is the vertical direction of the paper surface of FIG. 1), and a suction nozzle 8 as an extraction holder, respectively, and each of the beams 7A and 7B. Mounting heads 9A and 9B that can be moved separately in the direction along the direction (X direction which is the left-right direction of the paper surface of FIG. 1).

  The transport device 5 includes a supply conveyor 5A, a mounting position conveyor 5B having a positioning portion for positioning and fixing the printed circuit board P, and a discharge conveyor 5C. Then, the supply conveyor 5A conveys each printed board P received from the upstream device 2 to the positioning portion of the mounting position conveyor 5B, and mounts electronic components on each substrate positioned by the positioning device at each positioning portion. Then, it is the structure conveyed to the discharge conveyor 5C, and conveyed to the said downstream apparatus 3 after that.

  The mounting position conveyor 5B is provided with a pair of conveyance chutes 5B1 at least one of which can move in the width direction (direction orthogonal to the conveyance direction) of the printed circuit board P. As shown in FIG. The locking part 5B2, which is a locking plate, is fixed so that it partially protrudes inward toward the printed circuit board P, and the printed circuit board P can come into contact with the protruding part of the locking part 5B2 from below It becomes. Further, an end portion in a direction orthogonal to the conveyance direction of the printed circuit board P is placed on the conveyance belt 5B3, and the printed circuit board P is conveyed by the conveyance belt 5B3 by rotating a plurality of pulleys by a driving motor. . Then, a backup table to which a plurality of backup pins can be attached and raised is raised by an elevating drive source so that the backup pins come into contact with the lower surface of the printed circuit board P and the printed circuit board P (on the lower side of FIG. 2) When the printed board P is raised, the printed board P comes into contact with and engages with the locking portion 5B2 (see the upper printed board P in FIG. 2). Thus, the printed board P is horizontally supported.

  Further, as shown in FIG. 3, each of the locking portions 5B2 fixed on the pair of transport chutes 5B1 is formed with three notches 13 for measurement, and the notches 13 are formed. The conveyance chute 5B1 can be seen from above. That is, when the printed circuit board P is raised, the upper surface of the printed circuit board P comes into contact with and is engaged with the lower surface of the engaging portion 5B2, and in this engaged state, the upper surface of the transport chute 5B1 is The upper surface of the printed circuit board P is at the same height level.

  The component supply devices 6A and 6B are arranged at the back side and the front side of the transport device 5, and a large number of component supply units 10 are arranged side by side on a feeder base of a cart base as an attachment base. . Each cart table is detachably disposed on the apparatus main body via a connector so that the tip of the component supply unit 10 on the component supply side faces the conveyance path of the printed circuit board P. When attached to the cart, power is supplied to the component supply unit 10 mounted on the cart table, and when the handle is released and the handle is pulled, it can be moved by a caster provided on the lower surface.

  The pair of front and rear beams 7A and 7B that are long in the X direction individually move in the Y direction along a pair of left and right guides that are driven by the pair of Y direction motors 11. The beams 7A and 7B are respectively provided with mounting heads 9A and 9B that are moved along the guide by the X-direction motor 12 in the longitudinal direction (X direction).

  Accordingly, the mounting heads 9A and 9B are provided inside the beams 7A and 7B so as to face each other, and the mounting head 9A takes out an electronic component from the corresponding component supply unit 10 of the component supply device 6A on the back side. The mounting head 9B can take out an electronic component from the corresponding front-side component supply device 6B and mount it on the printed circuit board P.

  Each of the mounting heads 6A and 6B is provided with a plurality of suction nozzles 8 biased downward by respective springs at predetermined intervals on the circumference. 14, and by rotating the mounting heads 9 A and 9 B around the vertical axis by the θ-axis motor 15, as a result, the suction nozzles 8 of the mounting heads 9 A and 9 B can move in the X direction and the Y direction. It can rotate around a vertical line and can move up and down.

  Reference numeral 16 denotes a line sensor unit that protrudes downward from the center of the mounting heads 9A and 9B and serves as a detection unit for detecting the presence / absence of components and a suction posture (suction state) and a thickness detection unit for electronic components. A light emitting unit 16A provided with a light emitting element, a lens, and the like in a lower part of a support 9C provided at a substantially central portion of 9A and 9B, and a CCD element as a plurality of light receiving elements for receiving light from the light emitting element are provided. And a light receiving unit 16B. For example, when suction of a component provided in the mounting head 9A is performed, the suction operation of the electronic component by the selected suction nozzle 8 is completed, and each time the nozzle support that supports the suction nozzle 8 rotates, By detecting the height position of the end face as a boundary position where the light receiving state of each CCD element changes from light shielding to light receiving, it can be determined whether or not the electronic component is normally sucked. The line sensor unit 16 is also a mounting head height detection device.

  Reference numeral 17 denotes a component recognition camera that picks up images of electronic components sucked and held by the suction nozzles 8 provided in the mounting heads 9A and 9B before mounting them on the printed circuit board P.

  FIG. 4 is a control block diagram for control related to electronic component mounting of the electronic component mounting apparatus 1, which will be described below. Each element of the electronic component mounting apparatus 1 is centrally controlled by a control device 20 composed of a microcomputer or the like, and each storage element 21 stores various data. The bus line 22 Both are connected via

  Further, a monitor 23 which is a display device for displaying an operation screen and the like, and a touch panel switch 24 as an input means formed on the display screen of the monitor 23 are connected to the control device 20 via an interface 25. The Y direction motor 11, the X direction motor 12, the head vertical axis motor 14, the nozzle vertical axis motor 15, and the θ axis motor 18 are a power line 26, drivers (drive circuits) 28, 29, 30, 31, 32, respectively. The control device 20 is connected via a communication cable 27 and an interface 25. The control device 20 functions as a control device, a confirmation device, a determination device, a calculation device, and the like.

  Reference numerals 33, 34, 35, 36, and 37 denote encoders, which are provided in the Y direction motor 11, the X direction motor 12, the head vertical axis motor 14, the nozzle vertical axis motor 15, and the θ axis motor 18, respectively. The position information of 9A, 9B and the suction nozzle 8 is fed back to the drivers 28, 29, 30, 31, 32.

  The storage device 21 stores mounting data for each type of printed circuit board P. This mounting data is composed of mounting coordinates (X coordinate, Y coordinate Y, angle), component arrangement number, etc., for each electronic component mounting order. Further, the storage device 21 stores component arrangement data of each electronic component type (component ID) corresponding to the component arrangement number of each component supply unit 8 arranged on the cart table. Further, the storage device 21 stores component library data for each electronic component including shape data, recognition data, control data, and component supply data representing the characteristics of the electronic component.

  Reference numeral 38 denotes a recognition processing device connected to the control device 20 via the interface 25. The recognition processing device 38 performs recognition processing of an image captured by the component recognition camera 17, and performs control. The processing result is sent to the device 20. That is, the control device 20 outputs an instruction to the recognition processing device 38 so as to perform recognition processing (calculation of the amount of displacement) of the image captured by the component recognition camera 17 and receives the recognition processing result from the recognition processing device 38. Is.

  In FIG. 2, reference numeral 40 denotes a master nozzle that is a measurement master holder, and is attached to the mounting head 9 </ b> A in place of the suction nozzle 8. The master nozzle 40 has the same vertical length as the design of the suction nozzle 8.

  Here, a method for obtaining the height offset value of the mounting head will be described with reference to FIGS. First, the master nozzle 40 is attached to one mounting head 9 </ b> A instead of the suction nozzle 8. When the measurement switch portion that is the touch panel switch 24 displayed on the monitor 23 is pressed, the mounting head 9A moves in the plane direction and moves above the cutout portion 13 of the transport chute 5B1. Then, the control device 20 drives the nozzle vertical axis motor 15 to lower the master nozzle 40 from a position (height level) indicated by a dotted line in FIG. 2 to a position indicated by a solid line. The line sensor unit 16 is lowered so as to come to the detection position.

  Next, the line sensor unit 16 detects the position of the flange surface 40A, that is, a light receiving unit 16B having a plurality of CCD elements as light receiving elements receives light from the light emitting elements of the light emitting unit 16A, and The position of the flange surface 40A is detected, and the control device 20 stores the detected value in the storage device 21.

  Next, the control device 20 drives the head vertical axis motor 14 to lower the mounting head 9A. Then, when the mounting head 9A is lowered, for example, the lower end of the master nozzle 40 provided with a spring comes into contact with the upper surface of the transport chute 5B1 via the notch 13 of the locking portion 5B2, for example, the master nozzle 40 is connected. The spring provided on the nozzle shaft or the spring provided on the master nozzle 40 contracts, and the above-mentioned flange surface 40A of the master nozzle 40 obtained by driving the nozzle vertical axis motor 15 as described above with respect to the mounting head 9A. The position rises slightly.

  Then, the line sensor unit 16 detects that the flange surface 40A is slightly raised and changes to the value stored in the storage device 21, so that the control device 20 stops the lowering of the mounting head 9A. Control.

  When the position of the flange surface 40A changes and the lowering of the mounting head 9A stops, that is, the position of the flange surface 40A when the master nozzle 40 contacts the upper surface of the transport chute 5B1 (electronic component mounting). The control device 20 obtains a difference L1 between the height position (H1) relative to the device 1 and the position H2 of the flange surface 40A, which is a design value stored in advance in the storage device 21. And this difference L1 is the position H3 of the flange surface (bottom surface of the mounting head 9A) 9a when the mounting head 9A is lowered, and the flange surface 40A which is a design value stored in advance in the storage device 21. It is the same as the difference from the position H4 (designed height position) and is also the height offset value of the mounting head 9A.

  When the lower end of the master nozzle 40 hits the upper surface of the conveyance chute 5B1, the amount by which the master nozzle 40 is raised is a very small amount that can be detected by the line sensor unit 16, and the height offset of the mounting head 9A. This is a negligible amount for the difference L1 as a value.

  Then, as shown in FIG. 3, the above measurement is performed sequentially at, for example, six measurement points h1 to h6 for each of the six notch portions 13, and the mounting head 9A at each measurement point h1 to h6. Find the height offset value of. Furthermore, similarly, the master nozzle 40 may be attached to the mounting head 9B, and the height offset value of the mounting head 9A at each of the measurement points h1 to h6 may be obtained and stored in the storage device 21.

  By using the height offset value of the mounting head 9A, it is possible to vary the mounting stroke in consideration of the inclination of the transport chute 5B1 and the variation in assembly of the mounting heads 9A and 9B.

  Next, the use of the height offset value of the mounting head 9A will be described below. When the printed circuit board P is positioned, the printed circuit board P is divided into six as shown by a one-dot chain line in FIG. In the mounting areas m1 to m6 of the substrate P, the height teaching is performed using the height offset values of the measurement points h1 to h6.

  A calculation example of the height level of the printed circuit board P in the mounting areas m1 to M6 in this case will be described below. As a simple method, for example, the height offset values of the measurement points h1 to h6 are used as they are as the height offset values of the printed circuit board P in the corresponding mounting areas m1 to m6.

  In addition to such usage, other usage methods may be used, and the control device may calculate and use as follows. That is, the height offset value P1 of the printed circuit board P at a certain mounting point p1 (mounting position) is converted into the height offset values HP1, HP2, HP4, HP5 at the four measurement points h1, h2, h4, h5 near the mounting point p1. May be used for linear interpolation. For example, the height offset value P1 of the mounting point p1 is (HP1 × (B−b1) / B + HP2 × (B−b2) / B) × (A−a1) / A + (HP4 × (B−b1) / B) + HP5 × (B−b2) B) × (A−a2) / A

  A is the length between the pair of locking portions 5B2 and 5B2 fixed on the pair of transport chutes 5B1 and 5B1, and B is the length between the measurement points h1 and h2. Further, a1 is the length between the left locking portion 5B2 and the mounting point p1 in FIG. 3, a2 is the length between the right locking portion 5B2 and the mounting point p1 in FIG. 3, and b1 is 3 is a length between the measurement point h1 of FIG. 3 and the Y coordinate of the mounting point p1, and b2 is a length between the measurement point h2 of FIG. 3 and the Y coordinate of the mounting point p1.

  The height offset value obtained by the above calculation is used when the suction nozzle 8 is lowered when the electronic component is mounted on the printed board P.

  Next, an operation for mounting an electronic component on the printed circuit board P using the height offset value will be described. First, when the operation start switch provided on the touch panel switch 24 is operated by the work manager, the control device 20 controls the operation to start. That is, when the printed circuit board P is taken in from the supply conveyor 5A to the mounting position conveyor 5B, it is positioned and fixed by the positioning portion of the mounting position conveyor 5B, and the control device 20 places the mounting head 9A or 9B above each component supply unit 10. The Y-direction motor 11 and the X-direction motor 12 are controlled so as to move, and the θ-axis motor 15, the head vertical axis motor 14, and the nozzle vertical axis motor 15 so that the predetermined suction nozzle 8 rotates and descends. And the suction nozzle 8 takes out the corresponding electronic component from each component supply unit 10 by chain suction.

  Then, the Y motor 11 and the X motor 12 are driven to start moving in the XY directions, and the mounting head 9A or 9B is moved above the component recognition camera 17 while moving to mount the electronic component on the printed circuit board P. The electronic components picked up and held by the suction nozzles 8 are picked up by the component recognition camera 17 (fly recognition), and the component recognition processing operation is performed by the recognition processing device 26.

  When this component recognition operation is completed, the displacement of the electronic component with respect to the suction nozzle 8 is corrected by adding this recognition result to the mounting coordinates in the mounting data stored in the storage device 21. The motor 11, the X motor 12, the head vertical axis motor 14, the nozzle vertical axis motor 15, and the θ axis motor 18 are controlled to perform the mounting operation of the electronic component on the printed circuit board P according to the mounting order of the mounting data.

  In this case, when the head vertical axis motor 14 and the nozzle vertical axis motor 15 are driven and the mounting heads 9A and 9B and the suction nozzle 8 are lowered to mount the electronic component on the printed circuit board P, the storage device is stored in advance. The drive of the head vertical axis motor 14 is controlled so that the distance (corrected stroke) adjusted in consideration of the height offset value obtained as described above with respect to the movement amount stored in 21 is lowered. Lower. In this case, the drive of the nozzle vertical axis motor 15 may be controlled to lower the adjusted distance.

  That is, the control device 20 determines which mounting area m1 to m6 the mounting position based on the mounting data belongs, and uses the height offset values at the measurement points corresponding to the mounting areas m1 to m6. As described above, the height offset value of the mounting point obtained by linear interpolation using the height offset values of the four measurement points near the mounting point (mounting position) as described above is used. Thus, the above-described correction may be performed.

  In the above-described embodiment, the master nozzle 40 is first lowered, then the height of the mounting head 9A is detected by the line sensor unit 16 which is a height detection device, and then the mounting head 9A is lowered. Although the height of the mounting head 9A is detected again, the height of the mounting head 9A may be detected by the line sensor unit 16 without lowering the master nozzle 40.

  As described above, the present invention obtains the head height offset value of the mounting heads 9A and 9B with the simplest method and structure as much as possible, and considers the inclination of the printed circuit board P and the inclination of the transport chute 5B1 as the substrate. By making the strokes 9A and 9B variable, it is possible to ensure mounting of electronic components. Specifically, the mounting load applied to the electronic component can be made constant, and the electronic component can be securely mounted by preventing the electronic component from cracking or mounting displacement as much as possible.

  Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description, and the present invention is not limited to the various embodiments described above without departing from the spirit of the present invention. It encompasses alternatives, modifications or variations.

DESCRIPTION OF SYMBOLS 1 Electronic component mounting apparatus 5 Conveyance chute 5B2 Locking part 8 Suction nozzle 9A, 9B Mounting head 13 Notch part 14 Head vertical axis motor 15 Nozzle vertical axis motor 16 Line sensor unit 20 Control apparatus 21 Storage apparatus 40 Master nozzle P Printed circuit board

Claims (4)

A mounting plate is fixed to the upper surface of a transport shunt for transporting and guiding the substrate so that the upper surface of the substrate raised during positioning of the substrate comes into contact with and locks the locking plate. In the height detection method of the mounting head in the electronic component mounting apparatus for mounting the electronic component held by the component holder provided on the board on the substrate locked by the locking plate,
A master holder is attached to the mounting head instead of the component holder,
The height position of the master holder is detected by a height detection device provided in the mounting head, and the detected value is stored in the first storage device,
The mounting head is lowered and the master holder comes into contact with the upper surface of the conveyance chute through a notch formed in the locking plate, and the detection value by the height detection device is stored in the first storage device. If the detected value is different from the detected value, the lowering of the mounting head is stopped, and the difference between the height position of the mounting head and the designed height position at the time of the stop is set as a height offset value in the second storage device. The method of detecting the height of the mounting head in the electronic component mounting apparatus is characterized in that the storing is repeated for each of the plurality of cutout portions formed in the locking plate. A mounting plate is fixed to the upper surface of a transport shunt for transporting and guiding the substrate so that the upper surface of the substrate raised during positioning of the substrate comes into contact with and locks the locking plate. In the height detection method of the mounting head in the electronic component mounting apparatus for mounting the electronic component held by the component holder provided on the board on the substrate locked by the locking plate,
A master holder is attached to the mounting head instead of the component holder,
The detected value detected by the height detection device provided in the mounting head by lowering the master holder to a position that can be detected by the height detection device provided in the mounting head. In the first storage device,
The mounting head is lowered and the master holder comes into contact with the upper surface of the conveyance chute through a notch formed in the locking plate, and the detection value by the height detection device is stored in the first storage device. If the detected value is different from the detected value, the lowering of the mounting head is stopped, and the difference between the height position of the mounting head and the designed height position at the time of the stop is set as a height offset value in the second storage device. The method of detecting the height of the mounting head in the electronic component mounting apparatus is characterized in that the storing is repeated for each of the plurality of cutout portions formed in the locking plate. A mounting plate is fixed to the upper surface of a transport shunt for transporting and guiding the substrate so that the upper surface of the substrate raised during positioning of the substrate comes into contact with and locks the locking plate. In the electronic component mounting apparatus for mounting the electronic component held by the component holder provided on the substrate on the state of being locked by the locking plate,
A master holder attached to the mounting head instead of the component holder;
A height detection device provided on the mounting head for detecting the height of the master holder,
A first storage device for storing the detected value of the height detected by the height detection device;
The mounting head is lowered and the master holder comes into contact with the upper surface of the conveyance chute through a notch formed in the locking plate, and the detection value by the height detection device is stored in the first storage device. A control device that controls to stop the lowering of the mounting head if the detected value is different from the detected value;
A calculation device for obtaining a difference between the height position of the mounting head and the design height position at the time of stopping;
A second storage device that stores the difference calculated by the calculation device as a height offset value;
The electronic component mounting apparatus according to claim 1, wherein the operation of obtaining the difference and storing it as a height offset value is repeated for each of the plurality of cutout portions formed in the locking plate. A mounting plate is fixed to the upper surface of a transport shunt for transporting and guiding the substrate so that the upper surface of the substrate raised during positioning of the substrate comes into contact with and locks the locking plate. In the electronic component mounting apparatus for mounting the electronic component held by the component holder provided on the substrate on the state of being locked by the locking plate,
A master holder attached to the mounting head instead of the component holder;
A height detection device provided on the mounting head for detecting the height of the master holder,
A first controller that controls the master holder to be lowered to a position that can be detected by the height detector;
A first storage device that stores the detected value detected by the height detection device with the height of the master holder lowered to the position that can be detected by the control of the first control device;
The mounting head is lowered and the master holder comes into contact with the upper surface of the conveyance chute through a notch formed in the locking plate, and the detection value by the height detection device is stored in the first storage device. A second control device that controls to stop the lowering of the mounting head if it is different from the detected value,
A calculation device for obtaining a difference between the height position of the mounting head and the design height position at the time of stopping;
A second storage device that stores the difference calculated by the calculation device as a height offset value;
The electronic component mounting apparatus according to claim 1, wherein the operation of obtaining the difference and storing it as a height offset value is repeated for each of the plurality of cutout portions formed in the locking plate.

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