JP2989489B2 - Electronic component automatic mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pick-up nozzle rotatably provided at a plurality of positions on a peripheral edge of a rotary table rotatably mounted on a base, and a pick-up nozzle rotatably provided by a component supply unit. The present invention relates to an electronic component automatic mounting apparatus that takes out a component by transporting the component by rotating a rotary table, rotates the take-out nozzle by a motor during the transport, positions the electronic component at a predetermined angular position, and then mounts the component on a printed circuit board.

[0002]

2. Description of the Related Art An electronic component mounting apparatus of this type is disclosed in Japanese Patent Application No. Hei.
No.-124320 is disclosed in the specification and drawings attached to the application, and a suction nozzle for sucking an electronic component is provided on a mounting head so as to be rotatable by a motor, and a plurality of the mounting heads intermittently rotate. It is provided in. The motor is controlled by a CPU, which is usually provided on a base on which a rotary table is rotatably mounted, and which transmits a control signal to a drive circuit for driving the motor. Must be connected from the base side to the rotary table side, but because the rotary table rotates with respect to the base, signals are transmitted using slip rings, which are sliding contacts that make contact on the rotation axis of the rotary table. I was Since a plurality of such signal lines are required for each motor having the number of heads, the number of slip rings is required to be the number of heads times the number required for each head.

[0003]

However, in the above-mentioned prior art, since a large number of slip rings are installed, a space for installing the slip rings becomes large, and if there is only a small space, it cannot be installed. Expensive. Further, in the communication using the slip ring, there is a disadvantage that a sliding contact is easily worn, and a signal is disturbed by noise or the like generated by the worn sliding contact, so that a stable signal cannot be transmitted.

Accordingly, an object of the present invention is to make it possible to control a motor for each head in a rotary table inexpensively and stably.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a method of supplying a component by using a take-out nozzle rotatably provided on a mounting head disposed at a plurality of positions on a peripheral edge of a rotary table rotatably mounted on a base. The electronic component is taken out from the section, the component is transported by rotation of a rotary table, and the take-out nozzle is rotated by a motor attached to the rotary table during the transport to position the electronic component at a predetermined angular position, and then the printed circuit board. A table-side control unit provided in a rotary table that controls the motor based on the control data, and a base that sends control data to the table-side control unit. And a base-side control unit.

According to the present invention, there is provided a rotary table rotatably mounted on a base table. The rotary head is provided at a plurality of positions on a peripheral edge of a rotary table. The component is transported by rotating the table, and during the transport, the take-out nozzle is rotated by a motor attached to the rotary table to position the electronic component at a predetermined angular position, and then the electronic component is automatically mounted on a printed circuit board. In the apparatus, a table-side control unit provided for each head in a rotary table that controls the motor based on the control data, and a base that sends control data together with data specifying each control unit are provided. And a base-side control unit.

Further, according to the present invention, there is provided a rotary table which rotatably mounts a rotary table to a mounting table, which is rotatably mounted at a plurality of positions on a peripheral edge of a rotary table. The component is transported by rotating the table, and during the transport, the take-out nozzle is rotated by a motor attached to the rotary table to position the electronic component at a predetermined angular position, and then the electronic component is automatically mounted on a printed circuit board. In the apparatus, a table-side control unit provided in a rotary table that controls the motor based on the control data, and a base that sends a control data signal to the table-side control unit through a data transmission path are provided. Communication between the base side control unit and the control data between the base side end of the transmission path and the rotary table side end by an optical signal. It is obtained by a optical communication means for performing a non-contact manner.

According to another aspect of the present invention, there is provided a rotary table rotatably mounted on a base. The rotary head is provided at a plurality of positions on a peripheral edge of a rotary table. The component is transported by rotating the table, and during the transport, the take-out nozzle is rotated by a motor attached to the rotary table to position the electronic component at a predetermined angular position, and then the electronic component is automatically mounted on a printed circuit board. In the apparatus, a table-side control unit provided in a rotary table that controls the motor based on the control data, and a base that sends a control data signal to the table-side control unit through a data transmission path are provided. A base-side control unit, and a rotation center position of the rotary table between the base-side end of the transmission path and the rotary table-side end. The optical signal communication of control data is provided in which and a optical communication member for a non-contact manner.

[0009]

According to the configuration of the first aspect, the base-side control unit sends control data for controlling the motor to the table-side control unit in the rotary table, and the table-side control unit controls the motor based on the data. Control. According to the configuration of claim 2,
The base-side control unit sends control data together with data specifying the table-side control unit in the rotary table, and the specified table-side control unit controls the motor based on the data.

According to the third aspect of the present invention, the optical communication means is used between the base side end of the transmission path and the rotary table side end from the base side controller to the table side controller in the rotary table. Data transfer by optical communication is performed at the contact. According to the configuration of the fourth aspect, the light from the base-side control unit to the table-side control unit in the rotary table is contacted by the optical communication member at the center of rotation of the rotary table in the transmission path while the rotary table is rotating. Data transfer by communication is performed.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 2 and 3, reference numeral 1 denotes a Y table which moves in the Y direction by rotation of a Y-axis motor 2, and 3 denotes a movement in the X direction on the Y table 1 by rotation of an X-axis motor 4. As a result, the printed circuit board 6 on which the chip-shaped electronic components 5 (hereinafter, referred to as chip components or components) are mounted is fixedly mounted on fixing means (not shown).

Reference numeral 7 denotes a supply table, on which a number of component supply devices 8 for supplying the chip components 5 are provided. Reference numeral 9 denotes a supply stand drive motor, which rotates the ball screw 10 so that the supply stand 7 is guided by the linear guide 12 through a nut 11 fitted with the ball screw 10 and fixed to the supply stand 7, and X Move in the direction. Reference numeral 13 denotes a rotary table which rotates intermittently, and a mounting head 1 having six suction nozzles 14 as take-out nozzles at an outer edge of the table 13.
5 are arranged at equal intervals in accordance with the intermittent pitch.

A stop position (the position indicated by a black circle in the upper part of FIG. 2) of the mounting table 15 where the suction nozzle 14 stops the intermittent rotation of the rotary table 13 to suck and take out the component 5 from the supply device 8 is the suction station I. The suction nozzle 14 sucks the component 5 by lowering the mounting head 15 at the suction station I. Reference numeral II denotes a recognition station in which the mounting head 15 sucking the component 5 stops due to the intermittent rotation of the rotary table 13. An image of the component 5 is captured by the component recognition device 16, and the positional deviation of the component 5 with respect to the suction nozzle 14 is recognized. .

Reference numeral III denotes a mounting station at which the mounting head 15 stops to mount the component 5 sucked and held by the suction nozzle 14 on the printed circuit board 6 (a position indicated by a black circle in FIG. 2). The component 5 is mounted on the printed circuit board 6 stopped at a predetermined position by the movement of the XY table 3 due to the lowering of the mounting head 15 mounted on the elevating shaft 17 penetrating the table 13.

Reference numeral 18 denotes a drive power supply cord for transmitting a current from a drive driver 40 described later for driving a pulse motor 31 described later, and is connected to each mounting head 15. A vacuum tube 19 communicates with a vacuum source (not shown) for sucking the chip component 5 from the suction nozzle 14. Hereinafter, the mounting head 15 will be described with reference to FIG.

Reference numeral 21 denotes a mounting plate made of aluminum and attached to a lower portion of the shaft 17, and a pulse motor 22 is formed on the mounting plate 21. Reference numeral 23 denotes a rotor of the motor 22, which is rotatable in the θ direction within a stator 24 formed integrally with the mounting plate 21. The θ direction is a direction that rotates around an axis that extends vertically.

The suction nozzles 14 are provided so as to be vertically movable by penetrating the rotor 23 in the vertical direction. Although the suction nozzle 14 is provided eccentrically with respect to the rotation center of the rotor 23, the suction nozzle 14 that suctions the component 5 by the rotation of the rotor 23 moves the component 5 to an arbitrary angular position while the rotary table 13 is rotating. And it can be positioned regardless of whether it is stopped.

In FIG. 3, reference numeral 26 denotes an elevating lever which moves up and down to swing a swing lever 27 of the component supply device 8, and is wound around the tape reel 28 by swinging the lever 27 (not shown). The tape is fed, and the chip components 5 stored in the tape are supplied to the suction position of the nozzle 14. The rotary table 13 is rotatably attached to a base 29, and the supply table 7 and XY
The table 3 also moves with respect to the base 29.

Next, a control block of the electronic component automatic mounting apparatus of this embodiment will be described with reference to FIG. Reference numeral 30 denotes a host CPU, which controls various operations related to mounting of the chip component 5 in accordance with programs stored in the ROM 32 based on various data and the like stored in the RAM 31. Reference numeral 33 denotes a bus line that connects the CPU 30 to the RAM 31 and the like. The Y-axis motor 2 and the X-axis motor 4 to be controlled by the CPU 30 are driven by currents from the driving circuits 34 and 35. The driving circuits 34 and 35 are connected to interfaces 36 and 37, respectively.
6 and 37 are connected to the bus line 33,
In response to the command of 0, the interfaces 36 and 37 send pulses for driving the motors 2 and 3 to the drive circuits 34 and 35, respectively. The drive circuits 34 and 35 drive the motors 2 and 3 by supplying a current according to the pulse.

The mounting data as shown in FIG. 5 is stored in the RAM 31 for each type of the printed circuit board 6, and the component supply at the position on the supply table 7 indicated by the reel number in the order of the step numbers of the data. The component 5 is taken out from the device 8 and mounted at the coordinate position of the printed circuit board 6 indicated by “X” and “Y” at the angle position indicated by “θ” which is the mounting angle data. When only the mounting angle data rotates the suction nozzle 14 due to the rotation of the rotor 32, the chip component 5 taken out from the component supply device 8 is set to the angular position to be mounted if the sucked posture is correct.

Based on the X and Y data, the CPU 30 instructs the interfaces 36 and 37 for data representing the distance to be moved of the XY table 3 for each of the X and Y directions, and transmits the data via the transmission path described below. The control data signal is sent to a microcomputer 50 described later. An interface 38 for controlling the pulse motor 22 is further connected to the bus line 33. The pulse motor 22 is mounted on the rotary table 13 that rotates with respect to the base 29, and the CPU 30 The pulse motor 22 and C
The wiring between the PUs 30 cannot be connected by soldering the lead wires at this portion. Therefore, as shown in FIG. 6, the signal transmission path is connected in a non-contact manner by an optical coupler 39 between the base end and the rotary table end.
The interface 38 is connected with a modulation circuit 40 for modulating the data signal by optical communication by the optical coupler 35 and a demodulation circuit 41 for demodulating the transmitted data signal. An E / O conversion circuit 42 for converting the converted electric signal into an optical signal is connected, and an O / E conversion circuit 43 for converting the optical signal sent from the optical coupler 35 into an electric signal is connected. The conversion circuits 42 and 43 are connected to the optical coupler 39 at the base end of the signal transmission path.

An O / E conversion circuit 44 having the same function as the conversion circuit 43 and an E / E conversion circuit having the same function as the conversion circuit 42 are provided on the rotary table 13 side of the optical coupler 39.
The O conversion circuit 45 is connected. Further, a modulation circuit 46 having the same function as the demodulation circuit 41 is connected to the conversion circuit 44, and a modulation circuit 47 having the same function as the modulation circuit 40 is connected to the conversion circuit 45. The modulation circuits 46 and 47 are connected to an interface 48. From the light emitting and receiving elements 52 and 53 of the optical coupler 39, optical fibers 54, 55, 56 and 57 forming a part of a transmission path are converted into conversion circuits 42, 43 and 4 respectively.
4 and 45 are connected.

The interface 48 has a CP inside.
Microcomputers 50 (one-chip ICs) each having a U, a RAM, and a ROM are connected in a current loop multi-drop communication mode by the number corresponding to the pulse motors 22. Is connected to a drive circuit 51 that drives the pulse motor 22 by passing a current. Command data from the CPU 30 is sent to the microcomputer 50, and the microcomputer 50 sends a drive pulse to the drive circuit 51 to rotate the motor 22 in accordance with the data.

Next, the motor control data sent from the CPU 30 via the transmission line including the modulation circuit 40 and the optical coupler 39 has two parts as shown in FIG. That is, the first part is an address, and a code specifying a plurality of microcomputers 50 is instructed.
The next part is the operation data, and the amount of rotation of the motor 22 to be rotated is instructed. If the part 5 is to be positioned at an angle, the rotation amount obtained by adding the correction of the angle shift by the part recognition device 16 to the value of the mounting angle data in FIG. This address and operation data are set as a set
U30 outputs simultaneously, but the microcomputer 50
Is always in a receivable state, and as shown in the flowchart of FIG. 8, if the data is received and the address matches, the operation data is further read and the process for driving the motor is performed. The microcomputer 50 is a motor 22
Has a function of transmitting the current state (status) of the process for driving to the host CPU 30 via a transmission path including the modulation circuit 47 and the optical coupler 39.

The operation of the above configuration will be described below. First, when an operation unit (not shown) is operated to start the automatic operation of the electronic component automatic mounting apparatus, the CPU 30 reads the step number 1 in accordance with the mounting data stored in the RAM 31 and drives the supply table driving motor 9. The supply table 7 is moved to stop the component supply device 8 at the position of the reel number 001 containing the chip component 5 to be supplied at the suction position of the suction nozzle 14 of the mounting head 15 of the suction station I, and When the nozzle 14 descends, the chip component 5
Is taken out.

Next, the rotary table 13 rotates intermittently via an index mechanism (not shown), and the head 15 holding the chip component 5 moves to the next station, stops, and further rotates to go to the recognition station. -Go to option II. Next, the suction nozzle 14 is
An image of the chip component 5 sucked to the suction nozzle 14 is taken, the image is recognized, and the positional deviation of the component 5 with respect to the suction nozzle 14 is recognized.

Next, when the recognition is completed, the CPU 30 calculates an angle amount by adding the amount to be corrected based on the recognition result to the mounting angle data θ1 of the mounting data. Next, control data is created using the code indicating the head 15 sucking the component 5 of step number 1 as an address and the calculated angle amount as operation data, and an electric signal representing the data is output to the interface 38.

The data signal passes through a signal line forming a transmission line, is modulated for optical communication by a modulation circuit 40 also forming a transmission line, is converted to an optical signal by an E / O conversion circuit 42, and is converted into an optical signal. 39 is transmitted through the optical fiber 54. The optical coupler 39 has two transmission paths of optical fibers 55 and 57 in the opposite direction to optical fibers 54 and 56 through which light is transmitted from the base 29 to the rotary table 13. Although the optical axes on the light-emitting side and the light-receiving side of the respective transmission paths coincide with each other at a certain rotational position, they do not coincide with each other if they are rotated.
3 is provided at the rotation center position, the deviation of the optical axis is small, and the light spreads to some extent, so that the light is transferred regardless of whether the rotary table 13 is rotating or stopped at any position. The optical signal is input to the E-conversion circuit 44, converted into an electric signal, and then demodulated by the demodulation circuit 46.

Next, the control data signal demodulated to the original state by the demodulation circuit 46 is input to all the microcomputers 50 via the interface 48. Since all the microcomputers 50 are always in the receiving state, the address of the data shown in FIG. 7 is first read into each computer 50 as a command check in accordance with the flowchart shown in FIG. The comparison is performed, and only the computer 50 that matches the own code reads the angle amount of the operation data as the subordinate command.

Next, the computer 5 reading the angle amount
0 starts the motor processing operation, and also transmits the status to the CPU 30 via the transmission line including the modulation circuit 47 and the like. In the motor processing operation, the computer 50 outputs the number of pulses corresponding to the angle amount of the operation data to the drive circuit 51 at time intervals corresponding to the predetermined rotation speed of the motor 22, and the drive circuit 51 In response, the drive current is output to the motor 22, the rotor 23 rotates, and the suction nozzle 14 rotates by the commanded angle.

In the meantime, the rotary table 13 intermittently rotates to reach the mounting station III, and the printed circuit board on which the chip component 5 for which the angular positioning has been completed is positioned at the coordinate position indicated by the mounting data by moving the XY table 3. Attach to 6. At this time, the CPU 30 sends the mounting data XY to the interface 36 and the interface 37.
The interface 36 and 37 output the data of the movement amount in consideration of the result of the recognition to the data indicating the coordinates, and the interfaces 36 and 37 respectively determine the number of pulses according to the data by the drive circuits 34 and 35.
And the X-axis motor 2 and the Y-axis motor 4 are driven,
As a result, the XY table 3 moves to a predetermined position.

The operation of step No. 1 is performed as described above.
Are performed in the same manner at each of the stations, and the same operation is performed for the following step numbers.
In the present embodiment, the data transmission between the rotary table 13 and the base is optical communication by the optical coupler 39. However, instead of using the optical coupler, a slip ring is used instead of an electric signal to transmit the signal. The transmission may be performed on two lines from the rotary table 13 side to the base side and from the base side to the rotary table 13 side.

In the present embodiment, the pulse motor 22 is driven by a microcomputer 50 provided for each motor 22. However, in the rotary table 13, the interface 48 of the present embodiment has a CPU equivalent to the CPU 30.
And the pulse motor 22 may be driven by the same drive method as the X-axis motor 4 of the present embodiment.

[0034]

As described above, according to the present invention, the base-side control unit can control the motor by sending control data to the table-side control unit, so that the number of lines for connection with the table-side control unit is reduced. Can reduce the number of slip rings. Also, by transmitting data specifying the table-side control unit from the base-side control unit, data can be transmitted with a small number of lines.

Further, since the communication between the table-side control section and the base-side control section is performed by optical communication in contact with each other, stable communication is possible. In particular, if optical communication is performed at the center of rotation of the rotary table, the communication can be performed at any time during rotation. Communication becomes possible.

[Brief description of the drawings]

FIG. 1 is a control block diagram of an electronic component automatic mounting apparatus to which the present invention is applied.

FIG. 2 is a plan view of the electronic component automatic mounting apparatus.

FIG. 3 is a side view of the electronic component automatic mounting apparatus.

FIG. 4 is a side view showing the mounting head.

FIG. 5 is a diagram showing mounting data.

FIG. 6 is a perspective view showing a position of an optical coupler with respect to a rotary table.

FIG. 7 is a diagram showing data for motor control.

FIG. 8 is a diagram showing a flowchart.

[Explanation of symbols]

Reference Signs List 5 chip-shaped electronic component (electronic component) 6 printed board 13 rotary table 14 suction nozzle (extraction nozzle) 15 mounting head 22 pulse motor 29 base 30 host CPU (base-side control unit) 39 optical coupler (optical communication means) ( Optical communication member) 50 Microcomputer (table side control unit)

Claims (4)

(57) [Claims] An electronic component is taken out from a component supply unit by a take-out nozzle rotatably provided at a plurality of positions on a peripheral edge of a rotary table rotatably mounted on a base, and the rotary table is rotated. In the electronic component automatic mounting apparatus, which transports the component, and rotates the take-out nozzle by a motor attached to the rotary table during the transport to position the electronic component at a predetermined angular position and then mount the electronic component on a printed circuit board. A table-side control unit provided in a rotary table that controls the motor based on control data; and a base-side control unit provided in a base that sends control data to the table-side control unit. An electronic component automatic mounting device, characterized in that: 2. An electronic component is taken out from a component supply unit by a take-out nozzle rotatably provided at a plurality of positions on a peripheral edge of a rotary table rotatably mounted on a base, and the rotary table is rotated. In the electronic component automatic mounting apparatus, which transports the component, and rotates the take-out nozzle by a motor attached to the rotary table during the transport to position the electronic component at a predetermined angular position and then mount the electronic component on a printed circuit board. A table-side control unit provided for each head in a rotary table for controlling the motor based on control data, and a base provided in a base for sending control data together with data specifying each control unit An electronic component automatic mounting device comprising: a side control unit. 3. An electronic component is taken out from a component supply unit by a take-out nozzle rotatably provided at a plurality of positions on a peripheral edge of a rotary table rotatably attached to a base, and the rotary table is rotated. In the electronic component automatic mounting apparatus, which transports the component, and rotates the take-out nozzle by a motor attached to the rotary table during the transport to position the electronic component at a predetermined angular position and then mount the electronic component on a printed circuit board. A table-side control unit provided in a rotary table for controlling the motor based on control data, and a base provided in a base for sending a control data signal to the table-side control unit through a data transmission path Communication of control data between the side control unit and the base end of the transmission path and the end of the rotary table in a non-contact manner by an optical signal. An electronic component automatic mounting device, comprising: an optical communication unit. 4. An electronic component is taken out from a component supply unit by a take-out nozzle rotatably provided at a plurality of positions on a peripheral edge of a rotary table rotatably mounted on a base, and the rotary table is rotated. In the electronic component automatic mounting apparatus, which transports the component, and rotates the take-out nozzle by a motor attached to the rotary table during the transport to position the electronic component at a predetermined angular position and then mount the electronic component on a printed circuit board. A table-side control unit provided in a rotary table for controlling the motor based on control data, and a base provided in a base for sending a control data signal to the table-side control unit through a data transmission path And a control provided at a rotation center position of the rotary table between the base end of the transmission path and the rotary table end. An electronic component automatic mounting device comprising: an optical communication member for performing communication of application data in a non-contact manner by an optical signal.