JPH08236408A - Suction nozzle - Google Patents

Abstract

PURPOSE: To prevent failures in sucking a work and inserting from occurring without increasing complexity and a size of a nozzle body. CONSTITUTION: A nozzle body is formed with a first air chamber 21 and a second air chamber 22, while a positioning pin 30 is attached to the air chamber 21 so that it can move vertically and energized upward by a coil spring 35. The pin 30 is vertically movable due to a change in internal pressure of the air chambers 21, 22. If the air chamber 21 is largely depressurized when starting suction, the pin 30 lowers. On the other hand, when the suction is canceled, the pin 30 rises.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction nozzle, and more particularly to a suction nozzle for sucking and taking out a work and inserting it into a predetermined position when assembling electronic parts such as a trimmer capacitor.

[0002]

2. Description of the Related Art Conventionally, a work suction nozzle shown in FIG. 6 has been known as a work suction nozzle used for automatic assembly of electronic parts. This suction nozzle has a suction cylinder 2 at the bottom of a nozzle body 1, and a port 4 in an air chamber 3 inside.
Is provided, and the air chamber 3 can be sucked up to a vacuum state. Then, the pin 5 is fixed to the air chamber 3 with the tip taper portion 6 thereof protruding from the tubular portion 2. The pin 5 is fixed by pressing the boss portion 7 into the hole 3a.

By the way, the conventional suction nozzle has the following problems because the pin 5 is fixed to the nozzle body 1. As shown in FIG. 7A, the nozzle body 1 is attached to the work 12 set in the recess 11 of the work supply jig 10.
When it is displaced, the taper portion 6 of the pin 5 contacts the work 12. At this time, the driving force for moving the nozzle body 1 downward is directly applied to the work 12, so that the work 12 is deformed or damaged. Further, as shown in FIG.
When the positional deviation between the work 12 and the nozzle body 1 becomes large, the work 12 is sandwiched between the pin 5 and the jig 10, and it becomes difficult to lift the work 12 by suction.

To solve the above problems, FIG.
As shown in (c), it can be considered to reduce the diameter of the pin 5. However, in this case, the position of the work 12 relative to the nozzle body 1 becomes large during suction, and the insertion position of the work 12 is not stable. On the other hand, as shown in FIG. 7D, when the nozzle body 1 is lifted after the work 12 is inserted into the recess 16 of the insertion target 15, when the work 12 is constantly in contact with the pin 5, A problem that the work 12 is detached from the recess 16 is likely to occur.

In order to solve the above problems, it is conceivable that the pin 5 can be moved up and down by a cylinder, the pin 5 is lowered after the work 12 is adsorbed, and raised after the insertion. However, the provision of the pin driving means such as the cylinder complicates the structure of the nozzle, which is disadvantageous in terms of cost and size.

SUMMARY OF THE INVENTION An object of the present invention is to provide a suction nozzle capable of preventing workpiece suction failure and insertion failure without complicating and increasing the size of the nozzle body.

[0007]

In order to achieve the above object, a suction nozzle according to the present invention is provided with a suction air chamber having a suction opening at a lower portion thereof, and is vertically movable in the air chamber. The tapered lower portion is provided with a pin capable of projecting from the suction opening, and a spring member for elastically biasing the pin upward, and when the suction air chamber is in communication with the atmosphere, the pin is a spring member. Is retracted to the suction air chamber, and when the suction air chamber has a negative pressure, the pin is lowered against the elasticity of the spring member.

Normally, the pin is retracted upward due to the elasticity of the spring member. When the suction opening faces directly above the work and suction is started, the air chamber becomes a negative pressure. At this time, the pin descends against the elasticity of the spring member, and the work is attracted to the suction opening. On the other hand, when inserting the work into a predetermined insertion target, if the suction air chamber is communicated with the atmosphere,
As the work separates from the suction opening, the pin rises due to the elasticity of the spring member.

[0009]

Embodiments of the suction nozzle according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention, in which a nozzle main body 20 has a first air chamber 21 and a second air chamber 22 partitioned by a partition wall 23, and ports 24 and 25 are provided respectively. ing. Further, the lower portion of the first air chamber 21 is a suction cylinder portion 26 that opens downward.

The lower end of the positioning pin 30 has a taper portion 31.
The boss portion 32 at the upper end slides in the hole portion 23a of the partition wall 23 so as to be vertically movable within the first air chamber 21. The pin 30 is constantly urged upward by a coil spring 35, and its rising position is regulated by the boss portion 32 contacting the stopper screw 36. The stopper screw 36 is screwed to the ceiling portion of the second air chamber 22.

The first air chamber 21 can be opened to the atmosphere via the port 24 and can be sucked to a vacuum state. The second air chamber 22 can be set to a constant weak negative pressure via the port 25.

The operation of the suction nozzle will now be described. (1) First suction mode (see FIG. 2) First, the second air chamber 22 is set to a weak negative pressure, and the first air chamber 2
1 is open to the atmosphere. At this time, the pin 30 is the second
The air chamber 22 has a negative pressure and is raised by the elasticity of the coil spring 35, and is regulated to the top dead center by the stopper screw 36 (see FIG. 2A). In this state, it is preferable that the tapered portion 31 of the pin 30 slightly projects from the tubular portion 26.

In this state, the nozzle body 20 is moved right above the work 12 set in the recess 11 of the work supply jig 10. Then, the port 24 is connected to a negative pressure source (not shown) to bring the first air chamber 21 to a negative pressure. When the degree of vacuum of the first air chamber 21 increases, the pin 30 starts to descend against the elasticity of the coil spring 35 (see FIG. 2B). When the vacuum degree of the first air chamber 21 further increases while the pin 30 descends, suction of the work 12 is started (FIG. 2C).
reference).

The workpiece 12 is sucked while the edge portion of the center hole 12a is corrected along the taper portion 31 of the pin 30 and finally the cylindrical portion 26 and the center hole 12a are coaxially positioned. (See FIG. 2D). The bottom dead center of the pin 30 is preferably such that the straight end 30a coincides with the opening end surface of the tubular portion 26 at the time when the suction of the work 12 is started (see FIG. 3).

(2) Second suction mode (see FIG. 4) In this suction mode, the descending timing of the pin 30 is early,
After the descent, the suction of the work 12 is started. At first, as in the first suction mode, the second air chamber 22 has a weak negative pressure, and the first air chamber 21 is open to the atmosphere (FIG. 2).
(Same as (a)).

The port 24 is connected to a negative pressure source (not shown),
When the degree of vacuum of the first air chamber 21 increases, the pin 30 descends to the bottom dead center against the elasticity of the coil spring 35 (FIG. 4).
(See (a)). At this time, the pin 30 is attached to the coil spring 35.
, The weight of the pin 30 itself, and the difference in the internal pressures of the air chambers 21 and 22 result in a balanced state.

Next, the work 12 begins to be sucked, and the edge portion of the center hole 12a of the work 12 contacts the tapered portion 31 of the pin 30. The force for sucking the work 12 is adjusted to be sufficiently larger than the own weight of the work 12. Therefore, work 1
2 pushes back the pin 30 slightly (see FIG. 4B). The taper portion 31 and the edge portion of the center hole 12a are brought into contact with each other so that the work 12
Is corrected, and finally the work 12 is adsorbed to the end surface of the tubular portion 26. The work suction operation is performed in the second air chamber 2
The operation of the pin 30 can be variously changed by changing the internal pressure of 2.

Next, the work inserting operation will be described with reference to FIG. First, as described above, the nozzle body 20 sucking the work 12 is positioned on the recess 16 of the insertion target 15 (see FIG. 5A). Here, when the first air chamber 21 is opened to the atmosphere, the work 12 is immediately separated from the cylindrical portion 26, and the pin 30 starts to rise (see FIG. 5B).

Then, the work 12 is inserted into the concave portion 16 and the pin 30 rises to the top dead center, and the inserting operation is completed (see FIG. 5C). The top dead center of the pin 30 is preferably set to a position where the tapered portion 31 does not interfere with the work 12 regardless of the position of the work 12 in which the suction is released during insertion.

The suction nozzle according to the present invention is not limited to the above embodiment, but can be variously modified within the scope of the gist. For example, the second air chamber 22 may be open to the atmosphere. This does not necessarily mean that the second air chamber 22
Means there is no need to provide. Further, by combining the spring force of the coil spring 35 and the weight of the pin 30 with an appropriate value, the stopper screw 36 that regulates the top dead center of the pin 30 can be omitted.

[0022]

As is apparent from the above description, according to the present invention, the pin for positioning the work can be moved up and down, and the pin and the work can be moved relative to each other. The tip does not forcibly press the work, the risk of deformation or damage of the work can be eliminated, and the work can be surely sucked / adsorbed. Further, since the pin rises even when the work is inserted into the insertion target, the pin does not interfere with the work, and the insertion can be reliably performed.

Further, since the up and down movement of the pin is carried out by the balance between the elasticity of the spring member and the internal pressure of the nozzle, a driving means such as a cylinder is unnecessary, the nozzle is not complicated, and it is manufactured compactly and inexpensively. it can.

[Brief description of drawings]

FIG. 1 is a sectional view showing a suction nozzle according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a first suction mode of the suction nozzle.

FIG. 3 is an explanatory view showing a preferable position of a bottom dead center of a pin of the suction nozzle.

FIG. 4 is an explanatory view showing a second suction mode of the suction nozzle.

FIG. 5 is an explanatory view showing an inserting operation of the suction nozzle.

FIG. 6 is a sectional view of a conventional suction nozzle.

FIG. 7 is an operation explanatory view of the conventional suction nozzle.

[Explanation of symbols]

 Reference numeral 10 ... Work supply jig 12 ... Work 15 ... Inserted object 20 ... Nozzle body 21 ... First air chamber 22 ... Second air chamber 24, 25 ... Port 26 ... Suction cylinder 30 ... Pin

Claims (4)

[Claims] 1. A suction air chamber having a suction opening at a lower portion, a pin which is vertically movably installed in the suction air chamber, and a tapered lower portion of which can project from the suction opening, and the pin is elastic. A spring member for urging the suction air chamber upward, and when the suction air chamber communicates with the atmosphere, the pin retracts into the suction air chamber due to the elasticity of the spring member, and the suction air chamber becomes negative pressure. When the pin is lowered against the elasticity of the spring member, the suction nozzle. 2. A first air chamber having a suction opening at a lower portion, a second air chamber located immediately above the suction opening, and a second air chamber penetrating from the first air chamber. A suction nozzle, which is installed so as to be vertically movable in a state, and has a tapered lower part that can project from the suction opening, and a spring member that elastically biases the pin upward. . 3. The first air chamber can be opened to the atmosphere and can be sucked in negative pressure, and the second air chamber can be kept in a constant negative pressure state. The suction nozzle described. 4. The suction according to claim 2, wherein the first air chamber is openable to the atmosphere and capable of negative pressure suction, and the second air chamber is opened to the atmosphere. nozzle.