JP5903669B2 - Electronic component mounting apparatus and electronic component mounting method in electronic component mounting apparatus - Google Patents

Description

The present invention relates to an electronic component mounting apparatus that takes out an electronic component from a tape feeder, transfers and mounts the electronic component on a substrate, and an electronic component mounting method in the electronic component mounting apparatus .

  As a component supply device in an electronic component mounting apparatus, a tape feeder that frequently supplies an electronic component to a component suction position by a mounting head of a component mounting mechanism by intermittently feeding a carrier tape holding the electronic component is frequently used. As the tape feeding mechanism in the tape feeder, a structure is used in which a sprocket that engages with feeding holes provided at a constant pitch on the carrier tape is intermittently driven by a rotational driving mechanism using a motor as a driving source.

  In this configuration, in order to meet the demand for reduction in power consumption, the operation schedule for the component supply operation is set in advance based on the production program in advance, and the tape feeding mechanism is used during the time period when the component supply operation is stopped for a certain time or more. There has been proposed one having a function of shifting to a power saving mode such as shutting off power supply to a motor that drives the motor (for example, see Patent Document 1). Thereby, even when the component supply operation is not performed, it is possible to continue power supply and suppress power loss that wastes power.

JP 2008-098355 A

  However, when the above-described power saving mode is applied to a tape feeder having a pulse drive type drive source such as a servo motor, the following problems occur. That is, in order to realize a stable component supply operation in the tape feeder, it is necessary to pitch-feed the carrier tape holding the electronic component and hold it at the correct stop position. This position holding is performed by fixing the rotation of the sprocket with a servo lock mechanism against a tape peeling external force acting on the carrier tape when the top tape is peeled from the carrier tape.

  However, when the power saving mode is applied, since the power supply to the motor is cut off, the position of the sprocket cannot be held against an external force that disturbs the stop position of the carrier tape such as when the top tape is peeled off. As described above, in the prior art, there is a problem that it is difficult to ensure the stable supply of components because it is not possible to ensure the accuracy of the stop position of the carrier tape if power saving is attempted.

Accordingly, an object of the present invention is to provide an electronic component mounting apparatus and an electronic component mounting method in the electronic component mounting apparatus that can achieve both power saving of the tape feeder and guarantee of the stop position accuracy of the carrier tape.

An electronic component mounting apparatus according to the present invention is an electronic component mounting apparatus that takes out an electronic component from a tape feeder mounted on a component supply unit, and transfers and mounts the electronic component on a substrate. The tape feeder is a carrier tape that holds the electronic component. A tape feed mechanism that pitches the carrier tape to stop at a predetermined tape feed position by intermittently driving a sprocket that engages with the rocket, and a pulse drive that can rotate the sprocket and hold the position when stopped A motor of the type, an encoder that detects the rotational position of the sprocket, a feeder control unit that controls an operation mode of the motor based on an operation command from the electronic component mounting apparatus and an output of the encoder, and the operation mode is defined An operation mode storage unit that stores an operation mode to be stored, and Beyond the normal mode for performing a position holding for holding the normal tape feeding operation and the carrier tape to a stop position on the basis of the operation instruction, the time at which the command signal is set in advance for driving the motor from the electronic component mounting apparatus A power saving mode in which the power supply to the motor is stopped when the power supply is stopped, and the feeder controller is configured so that the encoder rotates the sprocket from the specified position during the execution of the power saving mode. If it is detected that the position has shifted beyond the fixed amount, the position correction is executed so that the deviation amount indicating the position shift from the specified position of the carrier tape becomes zero by returning to the normal mode.

An electronic component mounting method in an electronic component mounting apparatus according to the present invention is an electronic component mounting method in an electronic component mounting apparatus that takes out an electronic component from a tape feeder mounted on a component supply unit, and transfers and mounts the electronic component on a substrate. Includes a tape feed mechanism that pitches the carrier tape to stop at a predetermined tape feed position by intermittently driving a sprocket that engages the carrier tape holding the electronic component, and rotationally drives the sprocket. Controls the operation mode of the motor based on a pulse-driven motor capable of holding a position when stopped, an encoder for detecting the rotational position of the sprocket, an operation command from the electronic component mounting apparatus, and an output of the encoder The feeder control unit and the operation mode that defines the operation mode are stored. And a operation mode storage unit, the feeder control unit refers to the operation mode stored in the operation mode storage unit, holding the normal tape feeding operation and the carrier tape on the basis of the operation command in the stop position A normal mode in which position holding is performed, and a power saving mode in which power supply to the motor is stopped when a command signal for driving the motor from the electronic component mounting apparatus has expired over a preset time And when the encoder detects that the rotational position of the sprocket has deviated from a specified position by more than a predetermined amount during execution of the power saving mode, by returning to the normal mode, The position correction is executed so that the deviation amount indicating the positional deviation from the specified position of the carrier tape becomes zero .

  According to the present invention, the normal tape is stored based on the operation command from the electronic component mounting apparatus with reference to the operation mode stored in the operation mode storage unit and defining the operation mode of the motor that rotationally drives the sprocket of the tape feeding mechanism. The normal mode for executing the feed operation and position holding and the power saving mode for stopping the power supply to the motor when the command signal for driving the motor is over for a preset time are executed. When it is detected that the rotational position of the sprocket has deviated from the specified position by more than a predetermined amount during execution of the power mode, the operation mode of returning to the normal mode is adopted, thereby reducing the power consumption of the tape feeder and the carrier tape. It is possible to achieve both stop position accuracy and security.

The top view of the electronic component mounting apparatus of one embodiment of this invention The fragmentary sectional view of the electronic component mounting device of one embodiment of the present invention Structure explanatory drawing of the tape feeder of one embodiment of this invention Structure explanatory drawing of the feeder control part in the tape feeder of the tape feeder of one embodiment of this invention The flowchart which shows the tape feeding process in the electronic component mounting method of one embodiment of this invention

  Next, embodiments of the present invention will be described with reference to the drawings. First, the configuration of an electronic component mounting apparatus 1 for mounting electronic components on a substrate will be described with reference to FIGS. The electronic component mounting apparatus 1 is used in a component mounting line for producing a mounting substrate, and has a function of mounting an electronic component such as a semiconductor chip on the substrate. FIG. 2 is a partial cross section taken along the line AA in FIG. Is shown.

  In FIG. 1, a substrate transport mechanism 2 is disposed in the center of the base 1a in the X direction (substrate transport direction). The board transport mechanism 2 transports the board 3 carried in from the upstream side, and positions and holds the board 3 on a mounting stage set for executing a component mounting operation. Component supply units 4 are arranged on both sides of the board transport mechanism 2, and a plurality of tape feeders 5 are mounted in parallel on each component supply unit 4. The tape feeder 5 pitches a carrier tape containing electronic components in a tape feeding direction, that is, in a direction from the outside of the component supply unit 4 toward the substrate transport mechanism 2, thereby using a mounting head of a component mounting mechanism described below. Electronic components are supplied to the component suction position.

  A Y-axis movement table 7 having a linear drive mechanism is disposed at one end in the X direction on the upper surface of the base 1a. The Y-axis movement table 7 is similarly provided with a linear drive mechanism. Two X-axis moving tables 8 are coupled so as to be movable in the Y direction. A mounting head 9 is mounted on each of the two X-axis moving tables 8 so as to be movable in the X direction. The mounting head 9 is a multiple-type head having a plurality of holding heads. At the lower end of each holding head, as shown in FIG. 9a is attached.

  By driving the Y-axis movement table 7 and the X-axis movement table 8, the mounting head 9 moves in the X direction and the Y direction. As a result, the two mounting heads 9 take out the electronic components from the component suction positions of the tape feeders 5 of the corresponding component supply units 4 by the suction nozzles 9a and transfer them to the mounting points of the substrate 3 positioned by the substrate transport mechanism 2. Mount. The Y-axis moving table 7, the X-axis moving table 8, and the mounting head 9 constitute a component mounting mechanism 10 that moves and mounts the electronic component on the substrate 3 by moving the mounting head 9 that holds the electronic component.

  A component recognition camera 6 is disposed between the component supply unit 4 and the board transport mechanism 2. When the mounting head 9 that has picked up the electronic component from the component supply unit 4 moves above the component recognition camera 6, the component recognition camera 6 captures and recognizes the electronic component held by the mounting head 9. Mounted on the mounting head 9 are substrate recognition cameras 11 that are located on the lower surface side of the X-axis moving table 8 and move together with the mounting head 9. As the mounting head 9 moves, the board recognition camera 11 moves above the board 3 positioned by the board transport mechanism 2 and picks up and recognizes the board 3. In the component mounting operation on the substrate 3 by the mounting head 9, the mounting position correction is performed in consideration of the recognition result of the electronic component by the component recognition camera 6 and the substrate recognition result by the substrate recognition camera 11.

  As shown in FIG. 2, a carriage 12 in which a plurality of tape feeders 5 are mounted in advance on a feeder base 12 a is set in the component supply unit 4. The position of the carriage 12 is fixed in the component supply unit 4 by clamping the feeder base 12a to the fixed base 1b provided on the base 1a by the clamp mechanism 12b. The carriage 12 holds a supply reel 13 for storing a carrier tape 14 holding electronic components in a wound state. The carrier tape 14 drawn out from the supply reel 13 is pitch-fed by the tape feeder 5 to the component suction position by the suction nozzle 9a.

  Next, the configuration and function of the tape feeder 5 will be described with reference to FIG. As shown in FIG. 3, the tape feeder 5 includes a main body 5a and a mounting portion 5b protruding downward from the lower surface of the main body 5a. In a state where the tape feeder 5 is mounted with the lower surface of the main body portion 5a along the feeder base 12a, a connector portion (not shown) provided in the mounting portion 5b is fitted into the feeder base 12a. As a result, the tape feeder 5 is fixedly mounted on the component supply unit 4, and the built-in feeder control unit 26 for controlling the tape feeding in the tape feeder 5 is electrically connected to the control unit 27 of the electronic component mounting apparatus 1. Further, the control unit 27 is connected to a host system 28 that controls a component mounting line to which the device belongs.

  Inside the main body 5a, there is provided a tape running path 5c that guides the carrier tape 14 drawn from the supply reel 13 and taken into the main body 5a. The tape running path 5c is configured such that an electronic component is transferred by a mounting head 9 from a tape introduction port 5d opened between an extension portion 5e where the lower end portion of the main body portion 5a extends upstream and an upstream end portion of the main body portion 5a. It is provided in communication with the picked-up component pickup position. In the process of continuously executing the component mounting operation, a plurality of carrier tapes 14 each having a unit lot stored in one supply reel 13 are sequentially inserted from the tape introduction port 5d and supplied to the tape feeder 5. .

  A tape feeding mechanism 20 is disposed at the downstream end of the tape running path 5c on the tape feeding side. The tape feeding mechanism 20 is configured to intermittently drive the sprocket 21 by a motor 22. A plurality of feed pins (not shown) provided on the outer peripheral surface of the sprocket 21 are inserted into the feed holes of the carrier tape 14 and rotated while being engaged with the carrier tape 14, whereby the carrier tape 14 is pitch fed. Then, the mounting head 9 stops at a predetermined component suction position.

  The motor 22 is a pulse drive type motor such as a servo motor, and the sprocket 21 can be rotationally driven by an arbitrary rotation amount by numerical control and can be held at a stop. Further, the motor 22 includes an encoder 22a that outputs the rotational position as a feedback pulse. The feeder control unit 26 receives the feedback pulse from the encoder 22a and controls the motor 22, whereby the carrier tape 14 that is pitch-fed is fed. While stopping at a predetermined position, the position of the stopped carrier tape 14 can be held at the correct position.

  A tape pressing member 23 is disposed above the tape feeding mechanism 20, and the carrier tape 14 that has been pitch-fed is pressed and guided from above by the tape pressing member 23. The electronic component held on the carrier tape 14 is taken out by the suction nozzle 9a of the mounting head 9 through the take-out opening 23a formed in the tape pressing member 23 corresponding to the component suction position.

  Here, with reference to FIG. 4, the structure of the feeder control part 26 which has the function to control the operation | movement aspect of the motor 22 based on the operation command from the electronic component mounting apparatus 1 and the output of the encoder 22a is demonstrated. In FIG. 4, the feeder control unit 26 includes an arithmetic processing unit 30, a storage unit 31, a position detection processing unit 32, a motor driving unit 33, and an interface 34. The feeder control unit 26 receives drive power via an interface 34 connected to the main body of the electronic component mounting apparatus 1 and receives an operation command.

  The arithmetic processing unit 30 is a CPU having an arithmetic processing function, and controls the operation of the motor 22 via a motor driving unit 33 having a driver function in accordance with a program and data stored in the storage unit 31. The storage unit 31 stores operation mode data 31a, a tape feed parameter 31b, a stop time parameter 31c, and a deviation parameter 31d. The operation mode data 31a is data that defines the operation mode of the motor 22, and the storage unit 31 is an operation mode storage unit that stores an operation mode that defines this operation mode.

  The operation mode includes a normal mode for executing a normal tape feeding operation for pitch-feeding the carrier tape 14 based on an operation command from the electronic component mounting apparatus 1 and a position holding for holding the carrier tape 14 at a stop position, and a motor. And a power saving mode for stopping the power supply. In the present embodiment, when the command signal for driving the motor 22 from the electronic component mounting apparatus 1 has expired beyond a predetermined stop time set in advance, the mode is shifted to the power saving mode to reduce power consumption loss. I am doing so.

  The tape feed parameter 31b is data indicating the pitch feed amount of the carrier tape 14 in the component supply operation, and is defined for each component type to be supplied. The stop time parameter 31c is data defining a predetermined stop time set for shifting from the normal mode to the power saving mode. The arithmetic processing unit 30 always monitors the operation command from the electronic component mounting apparatus 1 in the normal mode, and if the time when the command signal is off exceeds the set time specified in the stop time parameter 31c, the normal mode To shift to power saving mode.

  The deviation amount parameter 31d is data that defines conditions defined for returning to the normal mode during execution of the power saving mode. Here, the deviation amount in which the rotational position of the sprocket 21 is displaced from the specified position is the deviation. The condition is set so that the mode returns to the normal mode when a predetermined value defined in the quantity parameter 31d is exceeded. The position detection processing unit 32 performs processing for detecting the rotational position of the sprocket 21 based on the feedback pulse output from the encoder 22a. The arithmetic processing unit 30 determines whether or not to return from the power saving mode to the normal mode by obtaining a deviation amount indicating a positional deviation from the specified position from the detection result and comparing the obtained deviation amount with the deviation amount parameter 31d. Determine whether.

  The tape feed parameter 31b, the stop time parameter 31c, and the deviation amount parameter 31d stored in the storage unit 31 are all rewritable, and are set to be appropriately changeable according to the target product type. In this change work, setting input may be performed via operation buttons provided individually on the tape feeder 5, and a plurality of tape feeders 5 may be targeted by the operation input function of the control unit 27 of the electronic component mounting apparatus 1. The setting change operation may be performed collectively. Further, when targeting a plurality of electronic component mounting apparatuses, the setting operation may be performed by the host system 28 of the component mounting line.

  Next, with reference to FIG. 5, in the electronic component mounting method by the electronic component mounting apparatus 1, a control process executed by the feeder control unit 26 in the tape feeding process in which the carrier tape 14 is pitch-fed by the tape feeder 5 will be described. To do. First, the tape feeding operation is started (ST1), and the operation mode is set to the normal mode for executing the normal tape feeding operation and the position holding of the carrier tape 14 based on the operation command from the electronic component mounting apparatus 1 (ST2). .

  In the execution process of this normal mode, the feeder control unit 26 constantly monitors whether or not a tape feeding operation command has been received (ST3). If there is a reception, the motor 22 is driven to perform the tape feeding operation of the carrier tape 14. Is executed (ST4). If the operation command is not received here, the arithmetic processing unit 30 monitors whether or not a set time defined in the stop time parameter 31c, that is, a predetermined stop time has elapsed (ST5). Here, if the set time has elapsed, the arithmetic processing unit 30 changes the operation mode, shifts from the normal mode to the power saving mode, and turns off the power supply to the motor 22 (ST6). As a result, the position holding of the motor 22 is released, and the carrier tape 14 engaged with the sprocket 21 can be displaced.

  Since such misalignment of the carrier tape 14 hinders normal component adsorption in the next component extracting operation, in this embodiment, a deviation amount indicating the misalignment from the specified position of the carrier tape 14 is obtained and obtained. It is determined whether or not the obtained deviation amount exceeds a prescribed value as an allowable limit prescribed in the deviation amount parameter 31d (ST7). If it is exceeded, it is determined that the carrier tape 14 is displaced beyond the allowable value, and the normal mode is restored to perform the position holding operation (ST8).

  That is, the power supply to the motor 22 is turned on, position correction is performed by the servo function so that the deviation amount at that time is zero, and then the rotational position of the motor 22 is held. Then, after the operations of (ST4) and (ST8) are performed, or when it is determined to be negative in (ST5) and (ST7), the monitoring state of (ST3) is returned in any case, and the same processing is repeated thereafter. To do.

  That is, in the tape feeding process in the electronic component mounting described above, the feeder control unit 26 refers to the operation mode stored in the storage unit 31 and performs normal tape feeding operation and position holding based on the operation command. The mode and the power saving mode in which the power supply to the motor 22 is stopped when the command signal for driving the motor 22 from the electronic component mounting apparatus 1 has expired beyond a preset time. When the encoder 22a detects that the rotational position of the sprocket 21 has shifted from the specified position by more than a predetermined amount during execution of the power saving mode, it returns to the normal mode.

  As a result, in the conventional technology, the problem that occurred in the method of cutting off the power supply to the motor of the tape feeding mechanism when stopping the tape feeding for the purpose of power saving, that is, the factor that disturbs the stopping position of the carrier tape such as when the top tape peels The problem that the position of the sprocket 21 cannot be held with respect to the external force to be solved is solved, and both the power saving of the tape feeder 5 and the guarantee of the stop position accuracy of the carrier tape 14 can be achieved.

The electronic component mounting apparatus and the electronic component mounting method in the electronic component mounting apparatus according to the present invention have the effect that both the power saving of the tape feeder and the guarantee of the stop position accuracy of the carrier tape can be achieved. This is useful in the field of component mounting where a supplied electronic component is taken out and mounted on a substrate.

DESCRIPTION OF SYMBOLS 1 Electronic component mounting apparatus 3 Board | substrate 4 Component supply part 5 Tape feeder 9 Mounting head 10 Component mounting mechanism 14 Carrier tape 20 Tape feed mechanism 21 Sprocket 22 Motor 22a Encoder 26 Feeder control part

Claims (2)

An electronic component mounting apparatus that takes out an electronic component from a tape feeder mounted on a component supply unit, and transfers and mounts the electronic component on a substrate.
The tape feeder is a tape feed mechanism that pitches the carrier tape to stop at a predetermined tape feed position by intermittently rotating a sprocket that engages the carrier tape holding the electronic component; and
A pulse-driven motor capable of rotationally driving the sprocket and holding the position when stopped; an encoder for detecting the rotational position of the sprocket;
A feeder control unit that controls an operation mode of the motor based on an operation command from the electronic component mounting apparatus and an output of the encoder;
An operation mode storage unit that stores an operation mode that defines the operation mode, and the operation mode executes a normal tape feeding operation and a position holding that holds the carrier tape at a stop position based on the operation command. Including a normal mode, and a power saving mode for stopping power supply to the motor when a command signal for driving the motor from the electronic component mounting apparatus has expired beyond a preset time,
When the encoder detects that the encoder has shifted from the specified position by more than a predetermined amount during execution of the power saving mode, the feeder control unit returns to the normal mode , An electronic component mounting apparatus , wherein position correction is performed so that a deviation amount indicating a positional deviation from a specified position of the carrier tape becomes zero . An electronic component mounting method in an electronic component mounting apparatus for taking out an electronic component from a tape feeder mounted on a component supply unit and transferring and mounting it on a substrate,
The tape feeder is configured to intermittently rotationally drive a sprocket that engages a carrier tape that holds the electronic component to pitch-feed the carrier tape to stop it at a predetermined tape feeding position, and to rotate the sprocket. An operation mode of the motor based on an operation command from the electronic component mounting apparatus and an output of the encoder, a pulse-driven motor capable of driving and holding a position at a stop, an encoder for detecting the rotational position of the sprocket A feeder control unit that controls the operation mode, and an operation mode storage unit that stores an operation mode that defines the operation mode,
The feeder control unit refers to the operation mode stored in the operation mode storage unit, and performs a normal tape feeding operation and a position holding for holding the carrier tape at a stop position based on the operation command. And, when a command signal for driving the motor from the electronic component mounting apparatus has been exceeded beyond a preset time, a power saving mode for stopping power supply to the motor is executed,
If the encoder detects that the rotational position of the sprocket has deviated from the specified position by more than a predetermined amount during execution of the power saving mode, the specified position of the carrier tape is restored by returning to the normal mode. An electronic component mounting method in an electronic component mounting apparatus , wherein position correction is performed such that a deviation amount indicating a positional deviation from the position becomes zero .

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