JP2012129322A - Component suction nozzle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a function for preventing the jump-out of a nozzle needle when releasing a negative pressure at a low cost.SOLUTION: A nozzle needle 23 is vertically movably provided on a nozzle body 21 and the nozzle needle 23 is energized downwards by an elastic member 24. An electromagnet 25 is provided on the lower part of the nozzle body 21, and when the electromagnet 25 is energized, a nozzle holding state of holding the height position of the nozzle needle 23 to the nozzle body 21 at a position of compressing the elastic member 24 upwards is attained. In a nozzle movable state of turning off the energizing of the electromagnet 25 and not holding the nozzle needle 23, a component 22 is sucked to the nozzle needle 23, and it is switched to the nozzle holding state by turning on the energizing of the electromagnet 25 before mounting the component 22 on a substrate and then releasing the negative pressure. After releasing the negative pressure and releasing the component 22, it is switched to the nozzle movable state by turning off the energizing of the electromagnet 25 at prescribed timing before sucking the next component 22.

Description

  The present invention relates to a component suction nozzle device in which a nozzle needle for sucking a component is supported so as to be vertically movable with respect to a nozzle body.

  For example, as shown in FIG. 4, a conventional suction nozzle 10 includes a nozzle body 11 held by a mounting head of a component mounting machine, a nozzle needle 12 supported by the nozzle body 11 so as to be movable up and down, and the nozzle A spring 13 for urging the needle 12 downward, supplying negative pressure to the nozzle needle 12 through the nozzle body 11 during operation of the component mounting machine, and supplying the component 14 supplied by the feeder of the component mounting machine to the nozzle needle When the lower end of the nozzle needle 12 that is lowered during the suction operation or mounting operation of the component 14 abuts against the component 14, or the component 14 that is attracted to the nozzle needle 12. So that the component 14 and the circuit board are prevented from being damaged by buffering the impact with the spring 13 when it hits the circuit board. There is a thing was.

  In this case, when the component 14 is adsorbed to the lower end of the nozzle needle 12, the lower end opening of the nozzle needle 12 is closed with the component 14. Therefore, as shown in FIG. As a result, the nozzle needle 12 compresses the spring 13 upward and is sucked up. In this state, the component 14 adsorbed by the nozzle needle 12 is mounted on the circuit board, the negative pressure is released and the component 14 is released, and then the entire suction nozzle 10 is raised, but the negative pressure is released. At the moment, the nozzle needle 12 protrudes downward by the repulsive force of the spring 13 and the lower end thereof is pressed against the component 14 on the circuit board, and the component 14 is damaged or the component 14 is mounted. The damaged circuit board can be damaged.

  Therefore, in Patent Document 1 (Japanese Patent Laid-Open No. 2002-176293), instead of a spring, two electromagnets that support a nozzle needle with electromagnetic force are provided in the nozzle body in an up-and-down positional relationship, and a component adsorption operation By controlling the electromagnetic force that supports the nozzle needle by controlling the currents of the two electromagnets individually during mounting or mounting operation, the impact applied to the component or circuit board from the nozzle needle during component suction operation or mounting operation Is buffered by electromagnetic force.

  Further, in Patent Document 2 (Japanese Patent Laid-Open No. 9-232795), three piston portions are provided in the nozzle body so that the forces acting on the piston portions due to negative pressure cancel each other out. The movement of the nozzle needle due to pressure is prevented.

JP 2002-176293 A Japanese Patent Laid-Open No. 9-232795

However, each of the configurations of Patent Documents 1 and 2 has a drawback in that the configuration is complicated and the size and cost are increased.
Therefore, the problem to be solved by the present invention is to provide a component suction nozzle device that can simplify the configuration and meet the demands for miniaturization and cost reduction.

  In order to solve the above-described problem, the invention according to claim 1 is directed to a nozzle main body held by a component mounting machine, a nozzle needle supported by the nozzle main body so as to be movable up and down, and biasing the nozzle needle downward. A component adsorbing nozzle device for releasing the negative pressure and releasing the component from the nozzle needle after mounting the component adsorbed by the negative pressure on the nozzle needle on the substrate. A holding means capable of switching between a nozzle holding state in which the height position of the nozzle needle is held at a position where the elastic member is compressed upward at the time of component adsorption and a nozzle movable state in which the nozzle member is not held; Before the negative pressure is released after mounting the sucked component on the board, the holding means is switched to the nozzle holding state, and the negative pressure is released. After releasing the said parts is obtained by a configuration in which a control means for switching said holding means at a predetermined timing before adsorbing the following components in the nozzle movably.

  In this case, if the holding means is switched to the nozzle movable state, the nozzle needle is urged downward by the elastic member. Therefore, by performing the adsorption operation and mounting operation of the component in the nozzle movable state, the component or the substrate is removed from the nozzle needle. The shock applied to the substrate can be buffered by the elastic member, and damage to the components and the board can be prevented. And since the holding means is switched to the nozzle holding state before releasing the negative pressure after mounting the component adsorbed on the nozzle needle on the substrate, the height position of the nozzle needle relative to the nozzle body (even if the negative pressure is released) The compression amount of the elastic member) can be maintained, and damage to the components and the board when the negative pressure is released can be prevented. In addition, since the holding means is simply switched between the nozzle holding state and the nozzle movable state, the configuration is simpler than those of the above-described Patent Documents 1 and 2, and the demand for downsizing and cost reduction can be met. .

  In the present invention, the holding means is switched from the nozzle holding state to the nozzle movable state at a predetermined timing before the next component is sucked, but at this time, because the nozzle needle is pushed down by the repulsive force of the elastic member, When the holding means is switched to the nozzle movable state before the interval between the nozzle needle that rises after releasing the part and the released part exceeds the pressing amount of the nozzle needle by the elastic member, the nozzle needle pressed down by the repulsive force of the elastic member There is a possibility that the lower end of the battery may collide with the component and damage the component or the board.

  As a countermeasure against this, as in claim 2, the nozzle holding state is maintained until the interval between the nozzle needle that rises after releasing the part and the released part is equal to or greater than the amount by which the nozzle needle is pushed down by the elastic member, and is set thereafter. The holding means may be switched to the nozzle movable state at a predetermined timing. In this way, when the holding means is switched to the nozzle movable state, it is possible to prevent the lower end of the nozzle needle pushed down by the repulsive force of the elastic member from colliding with the component and damaging the component or the substrate.

  In this case, as in claim 3, the nozzle needle is formed of a magnetic material, and the holding means is constituted by an electromagnet that holds the height position of the nozzle needle (the amount of compression of the elastic member) with respect to the nozzle body by electromagnetic force. Also good. As a result, the holding means can be easily switched between the nozzle holding state and the nozzle movable state simply by turning on / off energization of one electromagnet.

  According to a fourth aspect of the present invention, the holding means includes a holding mechanism that holds the height position of the nozzle needle with respect to the nozzle body against the repulsive force of the elastic member, and an actuator that drives the holding mechanism. Also good. In this case as well, the present invention can be realized with a simple configuration by simply switching the holding mechanism to two positions.

1A and 1B are diagrams schematically showing Embodiment 1 of the present invention, in which FIG. 1A is a sectional view when the lower end of a nozzle needle comes into contact with a component (immediately before suction), and FIG. It is sectional drawing which shows the state after adsorb | sucking. FIG. 2 is a flowchart illustrating the flow of processing of the nozzle holding state / nozzle movable state switching program according to the first embodiment. FIGS. 3A and 3B are diagrams schematically showing Embodiment 2 of the present invention, in which FIG. 3A is a cross-sectional view when the lower end of the nozzle needle comes into contact with the component (immediately before suction), and FIG. 3B is the lower end of the nozzle needle. It is sectional drawing which shows the state after adsorb | sucking. 4A and 4B are diagrams schematically showing a conventional suction nozzle, where FIG. 4A is a cross-sectional view of the nozzle needle when the lower end of the nozzle needle comes into contact with the component (immediately before the suction), and FIG. It is sectional drawing which shows the state after having performed.

  Hereinafter, two Examples 1 and 2 which embody the form for implementing this invention are demonstrated.

A first embodiment of the present invention will be described with reference to FIGS.
First, the configuration of the suction nozzle 20 of the first embodiment will be described with reference to FIG.
The nozzle body 21 of the suction nozzle 20 is formed in a cylindrical shape, and is exchangeably held by a mounting head of a component mounter (not shown). A nozzle needle 23 that adsorbs the component 22 with negative pressure is supported on the nozzle body 21 so as to be movable up and down, and a lower limit position of the nozzle needle 23 is regulated by a stopper (not shown). The nozzle needle 23 is made of a magnetic material such as an iron-based material. An elastic member 24 such as a spring or rubber that biases the nozzle needle 23 downward is housed in the nozzle body 21 above the nozzle needle 23.

  An electromagnet 25 is provided below the nozzle body 21 so as to surround the outer periphery of the nozzle needle 23. By energizing the electromagnet 25, the electromagnetic force causes the nozzle needle 23 to resist the repulsive force of the elastic member 24. It is configured so that it can be sucked and held at an arbitrary height position, and functions as a holding means in the claims. When the energization of the electromagnet 25 is turned off, the nozzle is in a movable state that does not hold the height position of the nozzle needle 23 with respect to the nozzle body 21, and when the electromagnet 25 is energized at a predetermined timing when the component 22 is attracted, the nozzle needle with respect to the nozzle body 21. Nozzle holding state in which the height position of 23 is held at a position where the elastic member 24 is compressed upward.

  ON / OFF of the energization of the electromagnet 25 is controlled by the controller 26. The controller 26 functions as a control means in the claims by executing a nozzle holding state / nozzle movable state switching program shown in FIG. After the component 22 adsorbed to the nozzle needle 23 is mounted on the substrate, before releasing the negative pressure, the electromagnet 25 is turned on to switch to the nozzle holding state, and the negative pressure is released to release the component 22. Later, at a predetermined timing before the next component 22 is attracted, the electromagnet 25 is turned off to switch to the nozzle movable state.

  At this time, when the electromagnet 25 is turned off and switched to the nozzle movable state, the nozzle needle 23 is pushed down by the repulsive force of the elastic member 24, so that the nozzle needle 23 that rises after the part is released and the released part 22 When the electromagnet 25 is turned off and switched to the nozzle movable state before the interval becomes equal to or greater than the amount by which the nozzle needle 23 is pushed down by the elastic member 24, the lower end of the nozzle needle 23 pushed down by the repulsive force of the elastic member 24 is the component. There is a possibility that the parts 22 and the substrate may be damaged by colliding with the parts 22.

  As a countermeasure against this, in the first embodiment, the nozzle holding state (the electromagnet 25 of the electromagnet 25) is maintained until the distance between the released nozzle 22 and the released nozzle 22 is equal to or greater than the amount of pressing of the nozzle needle 23 by the elastic member 24. ON state) and the energization of the electromagnet 25 is turned off at a predetermined timing set thereafter (a timing when the amount of rise of the nozzle body 21 after the release of the component 22 becomes equal to or greater than a predetermined value) to make the nozzle movable. I try to switch.

  The switching of the nozzle holding state / nozzle movable state of the first embodiment described above is executed by the controller 26 as follows according to the nozzle holding state / nozzle movable state switching program of FIG.

  The nozzle holding state / nozzle movable state switching program in FIG. 2 is repeatedly executed at a predetermined cycle while the component mounter is in operation. When this program is started, first, in step 101, it is determined whether or not the component 22 to be mounted this time is mounted on the board. If it is determined that the component is not yet mounted, the process proceeds to step 102 and the electromagnet 25 is turned off. Maintain the nozzle in a movable state. Thereby, the suction operation and the mounting operation of the component 22 are performed in the nozzle movable state. Since the nozzle needle 23 is urged downward by the elastic member 24 in the nozzle movable state, the impact applied to the component 22 and the substrate from the nozzle needle 23 is performed by performing the adsorption operation and mounting operation of the component 22 in the nozzle movable state. It can be buffered by the elastic member 24, and damage to the component 22 and the substrate can be prevented.

  Thereafter, when the component 22 adsorbed to the nozzle needle 23 is mounted on the substrate, “Yes” is determined in Step 101, the process proceeds to Step 103, and it is determined whether or not the negative pressure is released. If it is determined that it is before canceling, the process proceeds to step 104 where the electromagnet 25 is turned on to switch to the nozzle holding state. Thereby, even if the negative pressure is released thereafter, the height position of the nozzle needle 23 relative to the nozzle body 21 (the compression amount of the elastic member 24) is maintained.

  Thereafter, when the negative pressure is released and the component 22 is released, it is determined “Yes” in Step 103, and the process proceeds to Step 105, where the amount of rise of the nozzle body 21 after the release of the component 22 is greater than or equal to a predetermined value. It is determined whether or not. Here, the predetermined value is set to a value equal to or greater than the amount by which the nozzle needle 23 is pushed down by the elastic member 24 after the part 22 is released.

  If it is determined in step 105 that the amount of rise of the nozzle body 21 after the release of the component 22 is less than a predetermined value, the process proceeds to step 104 where the energization of the electromagnet 25 is maintained in the on state and maintained in the nozzle holding state.

  Thereafter, when the rising amount of the nozzle body 21 after the release of the component 22 becomes equal to or greater than a predetermined value, “Yes” is determined in Step 105, the process proceeds to Step 102, the energization of the electromagnet 25 is turned off, and the nozzle is movable. Switch to state. Thereby, the next component suction operation is performed in a nozzle movable state.

  In the first embodiment described above, if the electromagnet 25 is turned off and switched to the nozzle movable state, the nozzle needle 23 is urged downward by the elastic member 24. By performing the mounting operation, the impact applied to the component 22 and the substrate from the nozzle needle 23 can be buffered by the elastic member 24, and damage to the component 22 and the substrate can be prevented. Since the electromagnet 25 is turned on and switched to the nozzle holding state before releasing the negative pressure after mounting the component 22 adsorbed on the nozzle needle 23 on the substrate, the nozzle main body 21 even if the negative pressure is released. Therefore, the height position of the nozzle needle 23 (the amount of compression of the elastic member 24) can be maintained, and damage to the component 22 and the substrate when releasing the negative pressure can be prevented. In addition, since it is only necessary to switch on / off the energization of the electromagnet 25, the configuration is simpler than those of Patent Documents 1 and 2 described above, and it is possible to meet the demands for miniaturization and cost reduction. .

  In the second embodiment of the present invention shown in FIG. 3, a holding mechanism 31 that holds the height position of the nozzle needle 23 relative to the nozzle body 21 against the repulsive force of the elastic member 24, and an actuator 32 that drives the holding mechanism 31. And holding means.

  Specifically, the holding mechanism 31 is provided with a clamp member 31a in the lower part of the nozzle body 21 so as to be able to contact and separate from the outer peripheral surface of the nozzle needle 23, and when the actuator 32 such as a solenoid is turned on, the clamp member 31a is moved to the nozzle needle. When the nozzle 32 is pressed against the outer peripheral surface of the nozzle body 23 to hold the height position of the nozzle needle 23 against the nozzle body 21 against the repulsive force of the elastic member 24 and the actuator 32 is turned off, the clamp member 31 a The nozzle moves away from the outer peripheral surface of the nozzle needle 23. Other configurations are the same as those of the first embodiment.

  Also in the second embodiment, the actuator 32 is turned on to switch to the nozzle holding state before the negative pressure is released after the component 22 adsorbed to the nozzle needle 23 in the movable state of the nozzle is mounted on the substrate. Release and release the part 22. The nozzle holding state (actuator 32 on state) is maintained until the distance between the nozzle needle 23 that rises after the release of the component 22 and the released component 22 becomes equal to or greater than the amount by which the nozzle needle 23 is pushed down by the elastic member 24. The actuator 32 is turned off to switch to the nozzle movable state at a set predetermined timing (a timing when the rising amount of the nozzle body 21 after releasing the component 22 becomes equal to or greater than a predetermined value).

In the second embodiment described above, the same effect as that of the first embodiment can be obtained.
The actuator 32 may be a pneumatic actuator.

  DESCRIPTION OF SYMBOLS 20 ... Adsorption nozzle, 21 ... Nozzle body, 22 ... Parts, 23 ... Nozzle needle, 24 ... Elastic member, 25 ... Electromagnet (holding means), 26 ... Controller (control means), 31 ... Holding mechanism (holding means), 31a ... Clamp member, 32 ... Actuator

Claims (4)

A nozzle body that is held by a component mounter and into which negative pressure is introduced;
A nozzle needle that is supported by the nozzle body so as to be movable up and down, and adsorbs a component under the negative pressure;
An elastic member that is built in the nozzle body and biases the nozzle needle downward, and after mounting the component adsorbed by the negative pressure on the nozzle needle on the substrate, the negative pressure is released from the nozzle needle. In the component suction nozzle device for releasing the component,
Holding means capable of switching between a nozzle holding state in which the height position of the nozzle needle relative to the nozzle body is held at a position where the elastic member is compressed upward at the time of component adsorption, and a nozzle movable state in which the nozzle member is not held;
Before the negative pressure is released after mounting the component adsorbed to the nozzle needle in the nozzle movable state on the substrate, the holding means is switched to the nozzle holding state, and the negative pressure is released to release the component. And a control unit that switches the holding unit to the nozzle movable state at a predetermined timing before the next component is sucked.   The control means switches the holding means to the nozzle holding state after mounting the components, releases the negative pressure and releases the components, and then raises the nozzle body and the nozzle needle to release the nozzle needle. The nozzle holding state is maintained until the distance between the component and the component becomes equal to or greater than the pressing amount of the nozzle needle by the elastic member, and the holding means is switched to the nozzle movable state at the predetermined timing set thereafter. The component suction nozzle device according to claim 1, wherein The nozzle needle is formed of a magnetic material,
3. The component suction nozzle device according to claim 1, wherein the holding unit includes an electromagnet that holds a height position of the nozzle needle with respect to the nozzle body by electromagnetic force.   The holding means includes a holding mechanism that holds the height position of the nozzle needle with respect to the nozzle body against a repulsive force of the elastic member, and an actuator that drives the holding mechanism. The component suction nozzle device according to claim 1 or 2.

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