JP2016178243A - Component mounting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability of a movable cable with a simple structure.SOLUTION: A component mounting machine 10 includes: a stationary part 30; a movable part 16 removable to the stationary part 30; and a movable cable 70 which connects the stationary part 30 to the movable part 16. The stationary part 30 has a power supply unit 50. The movable part 16 has a load to which power from the power supply unit 50 is supplied through the mobile cable 70. The mobile cable 70 has a plurality of cables 72. When each end of the plurality of cables 72 is connected to the power supply unit 50 and another end is connected to the movable part 16, power from the power supply unit 50 is supplied to the movable part 16 through each of the plurality of cables 72.SELECTED DRAWING: Figure 2

Description

  The present specification relates to a component mounter for mounting components on a substrate.

  The component mounter operates by supplying power from a power source to a load (motor or the like) via a cable or the like. For this reason, the component mounter is provided with components such as a power supply unit and wires for supplying power from the power supply unit to the load. Patent Document 1 discloses a DC power supply device that supplies power to a load via a DC converter.

Japanese Utility Model Publication No. 6-44393

The component mounting machine has a movable part such as a mounting head, and the movable part is movable with respect to a fixed part provided with a power supply part and the like. For this reason, a movable cable is used as a cable connecting the movable part and the power supply part (fixed part), and power is supplied from the fixed part to the movable part by the movable cable. The movable cable connects the movable part and the fixed part in a curved state, and the curved shape changes according to the displacement of the movable part.
It is known that the durability of the movable cable decreases as the minimum bending radius of the curved shape decreases. For this reason, in order to improve durability, it is necessary to increase the minimum bending radius of the movable cable. However, since the space for arranging the movable cable is limited, the minimum bending radius of the movable cable may not be increased.
Moreover, in order to increase the current flowing through the movable cable, it is necessary to increase the cross-sectional area (outer diameter) of the movable cable. On the other hand, the greater the cross-sectional area of the movable cable, the lower the durability with the same minimum bending radius. For this reason, if the amount of current required by the load is ensured, the sectional area (outer diameter) of the movable cable must be increased, and the durability of the movable cable will be reduced.
The present specification provides a technique capable of supplying a current amount required for a load of a movable part and improving the durability even when the component mounter is arranged in a limited space. With the goal.

  The component mounting machine disclosed in the present specification includes a fixed portion, a movable portion that is movable with respect to the fixed portion, and a movable cable that connects the fixed portion and the movable portion. The fixed part has a power supply part, and the movable part has a load to which electric power from the power supply part is supplied via a movable cable. The movable cable has a plurality of cables, and each of the plurality of cables has one end connected to the power supply unit and the other end connected to the load, so that the power from the power supply unit is a plurality of cables. Is supplied to the load via each of the two.

  In the above component mounting machine, the power supply unit provided in the fixed part and the load provided in the movable part are connected by each of the plurality of cables, and the power from the power supply part is supplied to the load via each of the plurality of cables. Supplied. That is, the current flowing from the power supply unit to the load can be divided into a plurality of cables. For this reason, the electric current which flows through each of a some cable can be made small, and the cross-sectional area (outer diameter) of the cable per one can be made small. For this reason, even if it is a case where it arrange | positions in the limited space of a component mounting machine, durability of a movable cable can be ensured, enabling supply of the electric current required for the load of a movable part.

The side view which shows typically the structure of the component mounting machine of a present Example. The figure which shows typically the connection of the power supply part and load of the component mounting machine of a present Example. The figure which shows the flowchart of the process which controls the electric power supply from the power supply part to a load by the current control part in the component mounting machine of a present Example.

  The main features of the embodiments described below are listed. The technical elements described below are independent technical elements and exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Absent.

(Feature 1) The component mounter disclosed in the present specification may further include a protection unit that is provided in each of the plurality of cables and that limits the current flowing through the cables. According to such a configuration, when an overcurrent flows through any of the plurality of cables, the current flowing through the cable is limited by the protection unit. For this reason, it can prevent that overcurrent is supplied to the load of a movable part.

(Characteristic 2) In the component mounter disclosed in this specification, when the current value flowing through the cable that is a protection target of the protection unit exceeds a set value, the protection unit The electrical connection may be interrupted. In addition, the component mounter is configured to detect a current value flowing in each of a plurality of cables and a current value detected by the detection unit so that any of the plurality of cables is connected between the power supply unit and the load. A control unit that limits the power supplied from the power supply unit to the load according to the number of cables in which the electrical connection between the power supply unit and the load is cut off when it is detected that the electrical connection is cut off. Also good. According to such a configuration, even if the electrical connection between the power supply unit and the load is cut off by any of the plurality of cables, the power supply amount is limited by another cable that is not cut off from the electric connection. Can be operated.

(Feature 3) The component mounter disclosed in the present specification may further include a display unit that displays an electrical connection state between the power supply unit and the load of each of the plurality of cables. According to such a configuration, the user can recognize the number of cables whose electrical connection between the power supply unit and the load is cut off by the display unit, and can appropriately determine the replacement timing of the movable cable.

  Hereinafter, the component mounter 10 according to the first embodiment will be described. The component mounter 10 is a device for mounting the electronic component 4 on the circuit board 2. The component mounter 10 is also referred to as a surface mounter or a chip mounter. Usually, the component mounting machine 10 is provided together with a solder printer, other component mounting machines, and a board inspection machine, and constitutes a series of mounting lines.

  As illustrated in FIG. 1, the component mounter 10 includes a plurality of component feeders 12, a feeder holding unit 14, a mounting head (an example of a movable unit) 16, an imaging unit 20, the mounting head 16 and the imaging unit 20. A moving device 18 to be moved, a substrate conveyor 26, an operation panel (an example of a display unit) 28, and a main control device (an example of a fixed unit) 30 are provided.

  Each component feeder 12 accommodates a plurality of electronic components 4. The component feeder 12 is detachably attached to the feeder holding unit 14 and supplies the electronic component 4 to the mounting head 16. The specific configuration of the component feeder 12 is not particularly limited. Each component feeder 12 is, for example, a tape feeder that accommodates a plurality of electronic components 4 on a winding tape, a tray feeder that accommodates a plurality of electronic components 4 on a tray, or a plurality of electronic components 4 in a container. Any of the bulk type feeders that accommodates the ink at random.

  The moving device 18 moves the mounting head 16 and the imaging unit 20 between the component feeder 12 and the circuit board 2. The moving device 18 of the present embodiment is an XY robot that moves the moving base 18a in the X direction and the Y direction. The moving device 18 includes a guide rail that guides the moving base 18a, a moving mechanism that moves the moving base 18a along the guide rail, a motor that drives the moving mechanism, and the like. The moving device 18 is disposed above the component feeder 12 and the circuit board 2. The mounting head 16 and the imaging unit 20 are attached to the moving base 18a. The mounting head 16 and the imaging unit 20 are moved above the component feeder 12 and above the circuit board 2 by the moving device 18.

  The mounting head 16 includes a suction nozzle 6 that sucks the electronic component 4. The suction nozzle 6 can be attached to and detached from the mounting head 16. The suction nozzle 6 is attached to the mounting head 16 so as to be movable in the Z direction (vertical direction in the drawing). The suction nozzle 6 is configured to be moved up and down by an actuator (not shown; an example of a load) housed in the mounting head 16 and to suck the electronic component 4. In order to mount the electronic component 4 on the circuit board 2 by the mounting head 16, first, the suction nozzle 6 is moved downward until the lower surface (suction surface) of the suction nozzle 6 contacts the electronic component 4 accommodated in the component feeder 12. Move. Next, the electronic component 4 is sucked by the suction nozzle 6 and the suction nozzle 6 is moved upward. Next, the mounting head 16 is positioned with respect to the circuit board 2 by the moving device 18. Next, the electronic component 4 is mounted on the circuit board 2 by lowering the suction nozzle 6 toward the circuit board 2.

  The imaging unit 20 is attached to the moving base 18a. For this reason, when the mounting head 16 moves, the imaging unit 20 also moves together. The imaging unit 20 includes a camera support unit 22 and a camera 24. The camera support unit 22 is attached to the moving base 18a. A camera 24 is attached to the camera support portion 22. The camera 24 is disposed on the side of the suction nozzle 6 (the Y direction in the drawing). The camera 24 includes a camera control device (not shown) that controls the operation of the camera 24. The operation of the camera 24 is controlled by a camera control device.

  The board conveyor 26 is a device that carries the circuit board 2 into the component mounter 10, positions it on the component mounter 10, and carries it out of the component mounter 10. The substrate conveyor 26 of the present embodiment is constituted by, for example, a pair of belt conveyors, a support device (not shown) that is attached to the belt conveyor and supports the circuit board 2 from below, and a driving device that drives the belt conveyor. Can do. The operation panel 28 is an input device that receives an instruction from an operator. As will be described later, the operation panel 28 also functions as a display unit that notifies the operator of the disconnection state of the movable cable 70.

  The main control device 30 includes a computer having a CPU, a ROM, and a RAM. Although not shown, the component feeder 12, the mounting head 16, the moving device 18, and the operation panel 28 are communicably connected to the main control device 30. The main controller 30 mounts the electronic component 4 on the circuit board 2 by controlling these units (12, 16, 18, 28, etc.).

  As shown in FIG. 2, the main control device 30 further includes a power supply unit 50, a protection unit 54, a detection unit 56, and a current control unit 58. The main control device 30 and the mounting head 16 are connected by a movable cable 70.

  The power supply unit 50 converts power supplied from the outside into predetermined power, and supplies the converted power to the mounting head 16. The power supply unit 50 has a power supply circuit capable of controlling the amount of power supplied to the mounting head 16. The amount of power supplied from the power supply unit 50 is controlled by the current control unit 58. For example, a PWM switching circuit is used as the power supply circuit. The power supply unit 50 and the mounting head 16 are electrically connected by a movable cable 70 via a protection unit 54 and a detection unit 56.

  The movable cable 70 is composed of a plurality of cables 72. Each of the plurality of cables 72 connects the main control device 30 and the mounting head 16. That is, the current flowing from the power supply unit 50 to the mounting head 16 is shunted to the plurality of cables 72. Each cable 72 connects the mounting head 16 and the power supply unit 50 in a curved state, and the curved shape changes according to the displacement of the mounting head 16.

  The protection unit 54 is provided for each of the plurality of cables 72 and limits the current flowing through each cable 72. That is, the protection unit 54 cuts off the electrical connection between the power supply unit 50 and the mounting head 16 by the cable 72 when the value of the current flowing through the cable 72 provided with the protection unit 54 exceeds a set value. For the protection unit 54, for example, a thermal relay or a fuse is used.

  The detection unit 56 is provided in each of the plurality of cables 72 and detects a current value flowing through each cable 72. Each detection unit 56 is provided between the protection unit 54 and the mounting head 16. Each detection unit 56 is connected to a current control unit 58. The current value detected by each detection unit 56 is input to the current control unit 58. For the detection unit 56, for example, an ammeter is used.

  The current control unit 58 is electrically connected to the power supply unit 50 and limits the power supplied from the power supply unit 50 to the mounting head 16. Specifically, the current control unit 58 determines whether any of the plurality of cables 72 interrupts the electrical connection between the power supply unit 50 and the mounting head 16 based on the current value input from each detection unit 56. Determine whether. That is, when the current value input from each detection unit 56 is 0, it is determined that the electrical connection is interrupted. When the current value input from each detection unit 56 is not 0, the electrical connection is disconnected. Judge that it is not. When any of the plurality of cables 72 cuts off the electrical connection between the power supply unit 50 and the mounting head 16, the current control unit 58 determines the power supply according to the number of the cables 72 that are cut off from the electrical connection. The power supplied from the unit 50 to the mounting head 16 is limited. Further, the current control unit 58 identifies the cable 72 whose electrical connection is cut off, and causes the operation panel 28 to display the number and position of the cable 72. The disconnection of electrical connection is also caused by disconnection due to aging of the cable 72. For this reason, the limitation of power by the current control unit 58 is not limited to the case where the electrical connection is interrupted by the protection unit 54, but is also performed when the electrical connection is interrupted due to disconnection due to the aging of the cable 72.

  The operation panel 28 is electrically connected to the current control unit 58 and displays the state of the movable cable 70 based on information input from the current control unit 58. Specifically, the operation panel 28 displays the state of each cable 72 constituting the movable cable 70 (electrical connection state between the main control device 30 and the mounting head 16). As shown in FIG. 1, the operation panel 28 is attached to the front surface of the component mounter 10 at a position that is easily visible to the operator. For this reason, the operator can easily recognize the state of the movable cable 70 based on the information displayed on the operation panel 28.

  Next, a process in which the current control unit 58 controls the current flowing through the movable cable 70 will be described with reference to FIG. Note that the process shown in FIG. 3 is repeatedly executed at a predetermined cycle. As described above, the detection unit 56 detects the current value flowing through each of the plurality of cables 72 and inputs the current value to the current control unit 58. Therefore, first, the current control unit 58 acquires each of the current values input from the detection unit 56 (S20).

  Next, the current control unit 58 determines whether any of the plurality of cables 72 is disconnected from the electrical connection based on the current value input from each detection unit 56 (S22). That is, the determination is made based on whether or not the current value input from each detector 56 is zero. When detecting the cable 72 whose current value detected by the detection unit 56 is 0, the current control unit 58 blocks the current that the cable 72 flows from the main control device 30 to the mounting head 16 (cuts off the electrical connection). (S22: YES). If it is determined that none of the plurality of cables 72 interrupts the current (NO in S22), the process in the cycle ends.

  Next, the current control unit 58 flows from the power supply unit 50 to the mounting head 16 with the remaining cables 72 (that is, all cables 72 in which the electrical connection between the main control device 30 and the mounting head 16 is not interrupted). It is determined whether or not the maximum current can flow (S24). That is, it is determined whether or not the maximum current value required by the mounting head 16 can be supplied by the cable 72 in which electrical connection is maintained. Specifically, since the rated current value I of the cable 72 is known, it is determined whether I × n (the number of remaining cables 72) is equal to or greater than the maximum current value required by the mounting head 16. When the maximum current cannot be passed through the remaining cable 72 (NO in S24), the current control unit 58 limits the current flowing from the power supply unit 50 to the mounting head 16 (S26). That is, the current control unit 58 drives the power supply unit 50 with a load corresponding to the number of the cables 72 in which the electrical connection between the main control device 30 and the mounting head 16 is cut off, so that the mounting head 16 from the power supply unit 50 is driven. Is limited to a current value smaller than the total current value that can be passed through the remaining cable 72. On the other hand, if the maximum current can be passed through the remaining cable 72 (YES in S24), the process skips step S26 and proceeds to step S28.

  Next, the current control unit 58 specifies the number and location of the cables 72 in which the electrical connection between the main control device 30 and the mounting head 16 is interrupted, and displays the number and location on the operation panel 28 (S28). ). Thereby, the operator can be notified of which of the plurality of cables 72 is disconnected.

  In the component mounting machine 10 described above, the current flowing from the power supply unit 50 to the mounting head 16 is divided into the plurality of cables 72 provided with the protection unit 54. Therefore, it is only necessary to select a cable that can flow a current equal to or greater than the current value limited by the protection unit 54 for each of the plurality of cables 72. For this reason, the cable 72 is adjusted so that the total of the current values flowing through the cables 72 becomes larger than the maximum value of the current that needs to flow between the power supply unit 50 and the mounting head 16 by adjusting the protection unit 54. Number and size (outer diameter) can be selected. That is, the current flowing through each of the plurality of cables 72 can be reduced, and the cross-sectional area (outer diameter) of each cable can be reduced. For this reason, even if it is a case where it arrange | positions in the limited space of the component mounting machine 10, durability of the movable cable 70 can be ensured, making it possible to supply the electric current required for the mounting head 16. FIG.

  In the above component mounting machine 10, when any of the plurality of cables 72 is disconnected, the current control unit 58 limits the current flowing from the power supply unit 50 to the mounting head 16. That is, the component mounter 10 can continue the operation using the remaining cables 72 without stopping the operation by lowering the operation rate.

  Although the present embodiment has been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  For example, in the embodiment described above, the number of the cables 72 constituting the movable cable 70 may be any number. It can be changed as appropriate depending on the power supplied from the power supply unit 50 to the movable unit and the space of the component mounter 10.

  In the above-described embodiment, the protection unit 54 and the detection unit 56 are provided on the main control device 30 (fixed unit) side. However, the present invention is not limited to this configuration, and the protection unit and the detection unit are provided on the movable unit side. Also good. Alternatively, one of the protection unit and the detection unit may be provided on the movable unit, and the other of the protection unit and the detection unit may be provided on the fixed unit.

  The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

2: Circuit board 4: Electronic component 6: Suction nozzle 10: Component mounter 12: Component feeder 14: Feeder holding unit 16: Mounting head 18: Moving device 20: Imaging unit 22: Camera support unit 24: Camera 26: Substrate conveyor 28: Operation panel 30: Main controller 50: Power supply unit 54: Protection unit 56: Detection unit 58: Current control unit 70: Movable cable

Claims (4)

A component mounting machine comprising: a fixed part; a movable part that is movable with respect to the fixed part; and a movable cable that connects the fixed part and the movable part;
The fixed part has a power supply part,
The movable part has a load to which electric power from the power supply part is supplied via the movable cable,
The movable cable has a plurality of cables,
Each of the plurality of cables has one end connected to the power supply unit and the other end connected to the load, so that power from the power supply unit is supplied to the load via each of the plurality of cables. To be supplied,
Component mounter.   The component mounting machine according to claim 1, further comprising a protection unit that is provided in each of the plurality of cables and limits a current flowing through the cables. When the current value flowing through the cable that is the protection target of the protection unit exceeds a set value, the protection unit cuts off the electrical connection between the power source unit and the load by the cable,
The component mounter further includes:
A detection unit for detecting a current value flowing through each of the plurality of cables;
When the protection unit detects from the current value detected by the detection unit that any of the plurality of cables has cut off the electrical connection between the power supply unit and the load, the power supply unit and the load The component mounting machine of Claim 2 provided with the control part which restrict | limits the electric power supplied to the said load from the said power supply part according to the number of the cables by which electrical connection was interrupted | blocked. The component mounting machine according to claim 3, further comprising a display unit that displays an electrical connection state between the power supply unit and the load of each of the plurality of cables.

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