JPH01259600A - Parts holding mechanism for chip parts supply device - Google Patents

Abstract

PURPOSE:To make it possible to reliably hold and position chip parts and avoid larger type and higher price by closing a positioning claw with a first spring means to grasp chip parts after a nozzle is raised beforehand with a second spring means. CONSTITUTION:A nozzle 23 is provided movably up and down inside a cam shaft 13. The nozzle 23 and the cam shaft 13 are pressed down by driving means via an engagement member 24. The positioning clam 21a-21d are opened by the cam 14 of the cam shaft, as well as the chip parts are held by suction of the nozzle 23. After this, the force of pressing down by the driving means is released. Therefore, the nozzle 23 is raised first by a second spring means, after which the cam shaft 13 is raised by a first spring means, causing the positioning claws 21a-21d to close to grasp the chip parts and the positioning is achieved. As a result, by using only one driving source, holding and positioning chip parts reliably by means of a nozzle can be performed without introducing larger types or higher prices.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a chip component supply device for supplying chip components onto a printed circuit board, and in particular, a nozzle for sucking and holding chip components, and a device for supplying chip components onto a printed circuit board. The present invention relates to a chip component supply device equipped with an openable and closable positioning claw for positioning a held chip component.

[Conventional technology]

There is a device that uses a robot as a chip component supply device for supplying chip components onto a printed circuit board, and the component holding mechanism in this chip component supply device uses vacuum pressure to hold pre-aligned chip components through a nozzle. In some devices, the chip components are held by suction and held, and after being positioned using positioning claws that can be opened and closed, the chip components are supplied onto the printed circuit board.

Fig. 2 is a partially sectional side view showing a conventional component holding mechanism of this type. In the figure, reference numeral 1 indicates axes provided on the robot (not shown) for movement in the X, Y, and Z directions. A mounting plate is attached to the Y-axis of the two through a joint (not shown), 2 is a cylinder fixed to this mounting plate, and 3 is a cylinder fixed to this mounting plate.
is the cylinder axis.

A camshaft 4 is supported by the mounting plate 1 so as to be movable up and down.The upper end of the camshaft 4 is connected to the cylinder shaft 3, and a cam portion 5 of a predetermined shape is formed on the outer periphery of the lower part.

A nozzle 6 is provided to protrude from the lower end of the cam portion 5, and this nozzle 6 is connected to a vacuum pump (not shown).

7a and 7b are attached to the mounting plate 1 so that they can be opened and closed with each other.
A pair of positioning pawls rotatably supported on the lower surface of the roller 8a respectively position the roller 8a in a predetermined position.

8b, and these positioning claws 7a and 7b are connected to the cam portion 5 by means of plate springs (not shown) or the like.
It is biased so that it is always in contact with.

Although not shown here, the positioning claws 7a and 7
It has another pair of positioning claws perpendicular to b.

9 is a chip component.

In this configuration, chip components are supplied to a printed circuit board (not shown) as follows.

First, the Y-axis, Y-axis, and Y-axis of the robot (not shown) are driven by a drive means (not shown) to move the entire component holding mechanism together with the mounting plate 1 onto a parts storage unit (not shown), and the supply in this parts storage unit is moved. The chip component 9 to be removed is escaped to a suction position by a cylinder or the like (not shown).

After that, when the nozzle 6 is lowered together with the cam shaft 4 by driving the cylinder 2 and moving the cylinder shaft 3 downward, the slope of the cam part 5 causes the rollers 8a, 8b to
The positioning claw 7a is inserted through the positioning claw 7a.

7b is pushed, and as a result, the positioning claws 7a, 7b and the positioning claws (not shown) are opened, and the lower end of the nozzle 6 comes into contact with the chip component 9.

Here, when the vacuum pump (not shown) is driven, the nozzle 6
Since the tip part 9 is held at the tip by the suction force, when the drive of the cylinder 2 is then stopped, the nozzle 6 is integrated with the camshaft 4 while holding the chip part 9 due to the tensile force of a spring (not shown). As the camshaft 4 rises, the rollers 8a and 8b slide down the slope of the cam portion 5, whereby the positioning pawl 7a.

7b is closed, and the chip component 9 is sandwiched between their tips to determine its position.

After positioning the chip component 9 in this way, the Y-axis, Y-axis, and Y-axis of the robot are driven by a drive means (not shown), and the entire component holding mechanism together with the mounting plate 1 is moved onto a printed circuit board (not shown). When the nozzle 6 is lowered together with the camshaft 4 by further driving the cylinder 2 and moving the cylinder shaft 3 downward, the slope of the cam portion 5 causes the nozzle 6 to move through the rollers 8a and 8b as before. The positioning claws 7a, 7b are pushed, and as a result, both the positioning claws 7a, 7b open together with the positioning claws (not shown), so that the chip component 9 is released from them.

Then, since the chip component 9 is positioned on the chip land provided at the mounting position of the printed circuit board, the driving of the vacuum pump is stopped, thereby releasing the chip component 9 from the suction force of the nozzle 6. and supply it onto the chip land of the printed circuit board.

[Problem to be solved by the invention]

As explained above, in conventional component holding mechanisms, the positioning claws are opened and closed in synchronization with the vertical movement of the nozzle.
If the timings of these two are different and, for example, the positioning pawl closes early, there is an inconvenience that the chip component held in the nozzle will hit the positioning pawl and fall.

As a method to eliminate this inconvenience, there is a method to prevent the timing of the cam part, the roller, and the positioning pawl from shifting by increasing the manufacturing precision of the individual parts and the assembly precision of these parts, or to improve the timing of the nozzle. A possible method is to use separate cylinders for vertical movement and opening and closing of the positioning claw, and to control the positioning claw to close after the nozzle has risen to a certain position, but the former method requires precision machining, etc. The latter method requires a plurality of cylinders as driving means, making it difficult to manufacture and assemble, resulting in high costs.The latter method also requires a plurality of cylinders as driving means, resulting in an increase in size and price.

The present invention has been made to solve these problems, and it is possible to reliably hold and position a chip component by moving the nozzle up and down and opening and closing the positioning claw using a single drive source, and It is an object of the present invention to realize a component holding mechanism in a chip component supply device that does not cause difficulty in assembling two components and does not cause an increase in size or price.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention includes a bearing fixed to a mounting plate attached to a robot of a chip component supplying device, a cam portion at the lower part and an escape groove at the upper part, and the cam The bearing has a cylindrical camshaft installed in the bearing so that it can move up and down so that the bearing protrudes downward, and a first spring means that constantly biases the camshaft upward. two pairs of positioning pawls that are pivotally supported on the lower end of the bearing so as to be able to open and close in orthogonal directions and each urged to abut against the cam portion; a nozzle that protrudes downward from the lower end of the cam portion; an engaging member that is attached to the upper end of the nozzle, fits into the relief groove of the camshaft, and protrudes outward from the bearing; The second spring means has a higher spring pressure than the first spring means and urges the nozzle upward through the engaging member, and the driving means pushes down the nozzle and the camshaft through the engaging member. It is something.

[Effect]

In the present invention having the above-described configuration, the nozzle and the camshaft are pushed down by the drive means via the engagement member, the positioning pawl is opened by the cam part, and the chip component is sucked and held by the nozzle, and then the drive means pushes down the nozzle and the camshaft. When the force is released, the second spring means causes the nozzle to rise first;
The camshaft is then raised by the spring means of the joint 1 and the positioning pawls are closed, whereby each positioning pawl pinches the chip component and positions it.

Therefore, with this, it becomes possible to securely hold the chip component by the nozzle and position the chip component by the positioning claw by using only one driving source, and it is also difficult to perform manufacturing and assembly. In other words, by delaying the timing of the closing operation of the positioning claws compared to the rise of the nozzle, the chip components are clamped by the positioning claws, which eliminates the need for precision in manufacturing and assembly, and increases the size and size. This will not lead to higher prices.

〔Example〕

Examples will be described below with reference to the drawings.

FIG. 1 is a configuration diagram showing an embodiment of a component holding mechanism in a chip component supply device according to the present invention, in which FIG. 1 (I) is a plan view and FIG. Figure, same figure (
II[) is a sectional view taken along the line BB in Figure (I).

In the figure, reference numeral 10 denotes a mounting plate, and like the mounting plate 1 in FIG. 2, this mounting plate 10 is attached to a Z-axis provided on a robot (not shown) via a joint (not shown).

Reference numeral 11 denotes a hollow bearing fixed to the lower surface of the mounting plate 10, and guide holes 12a and 12b of a predetermined length extending in the vertical direction are provided in the bearing 11 so as to face each other.

Reference numeral 13 denotes a cylindrical camshaft, and the camshaft 13 has a cam portion 14 on the outer periphery of the lower part, and an escape groove 15 cut downward by a predetermined length from the upper end surface on the upper part. The cam portion 14 is arranged vertically movably within the bearing 11 so as to protrude below the bearing 11.

Reference numeral 16 denotes a rotation prevention member fixed to the middle of the outer circumference of the camshaft 13, and projections 17a and 17b provided on this rotation prevention member.
are slidably fitted into the guide holes 12a, 12b of the bearing 11, so that the camshaft 13 can move up and down without rotating in the direction around the shaft.

Reference numeral 18 is attached to the outer periphery of the camshaft 11 to connect the bearing 11
The camshaft 11 is urged upward by a coil spring 18 as a first spring means passed between the lower end of the camshaft 11 and the rotation prevention member 16.

19 is a stopper screwed onto the upper end of the camshaft 11;
This stopper 19 also serves as an adjusting means for adjusting the top dead center of the camshaft 11.

Incidentally, this stopper 19 is also provided with a groove having the same width as the escape groove 15 of the camshaft 11.

Reference numeral 20 denotes a stopper receiver provided on the mounting plate 11, and when the stopper 19 abuts against this stopper receiver 20, the camshaft 13 is stopped from rising.

Reference numerals 21a and 21b and 21c and 21d are pairs of positioning claws, respectively.
It is rotatably supported at the lower end of the. Further, each of these positioning claws 21a to 21d has a roller 22a at a predetermined position.
, 21b, 21c.

and 22d are provided, and the rollers 22a to 22d are urged by a plate spring or the like (not shown) so that they always come into contact with the cam portion 14.

A nozzle 23 is provided within the camshaft 13 so as to be movable up and down, and is connected to a vacuum pump (not shown). The lower part of the nozzle 23 protrudes from the lower end of the cam part 14 by a predetermined length, and an engaging member 24 is attached to the upper end.
5 and protrudes outward from the bearing 11.

25 is a coil spring as a second spring means passed between the engagement member 22 and a bracket fixed to the lower end of the bearing 11, and has a spring pressure greater than that of the second spring means; The coil spring 25 urges the nozzle 23 upward.

26 is a cylinder attached to the mounting plate 10 via a mounting bracket (not shown); 27 is a cylinder shaft;
8 is the cylinder shaft 2 so as to be able to engage with the engaging member 24.
It is a driving member fixed to 7.

Next, the operation of the above-described configuration will be explained.

First, the X-axis, Y-axis, and Z-axis of the robot (not shown) are driven by driving means (not shown) to move the entire component holding mechanism together with the mounting plate 1 onto a parts storage unit (not shown), and the supplied parts in this parts storage unit are moved. The chip components to be removed are made to escape to a suction position by a cylinder or the like (not shown).

Thereafter, when the cylinder 26 is driven to move its cylinder shaft 27 downward, the driving member 28 fixed to the cylinder shaft 27 pushes down the engagement member 24.

As a result, the nozzle 23 descends while compressing the coil spring 25, and at the same time, the engaging member 24 pushes down the camshaft 13 via the rotation prevention member 16, so the camshaft 13 also lowers the nozzle while compressing the coil spring 18. It descends together with 23.

Then, as the camshaft 13 descends, the positioning claws 21a to 21d are pushed by the slope of the cam portion 14 via the respective rollers 22a to 22d.
a to 21d are opened, and when the nozzle 23 has lowered to the bottom dead center, its lower end abuts on the chip component.

Here, when the vacuum pump (not shown) is driven, the nozzle 2
Since the chip component 9 is suctioned and held at the lower end by the suction force of No. 3, the driving of the cylinder 2 is then stopped.

As a result, the camshaft 13 and the nozzle 23 are released from the downward force exerted by the drive member 28, and are raised by the restoring force of the coil springs 18 and 25, but as mentioned above, the spring pressure of the coil spring 25 is reduced by the spring pressure of the coil spring 18. Since the nozzle 23 holds the chip component 9 and pushes up the drive member 28 via the engagement member 24, it rises until the coil spring 25 is fully extended, and then the stopper 19 hits the stopper receiver 20. The camshaft 13 rises until the end.

As the camshaft 13 rises, the roller 22
As a to 22d slide down the slope of the cam portion 14, the positioning claws 21a to 21d close, and the chip components are sandwiched between their tips and positioned.

After positioning the chip component in this way, the X-axis, Y-axis, and Y-axis of the robot are driven by a drive means (not shown) to move the entire component holding mechanism together with the mounting plate 10 onto a printed circuit board (not shown). , further cylinder 26
When the cam shaft 13 is lowered together with the nozzle 23 by driving the cylinder shaft 3 downward in the same manner as described above, the slope of the cam portion 14 causes the rollers 22a to 22d to move downward.
The positioning claws 21a to 21d are pushed through the positioning claws 21a to 21d, and as a result both of the positioning claws 21a to 21d open, the chip components are released from the positioning claws 21a to 21d.

Then, since the chip component is positioned on the chip land provided at the mounting position of the printed circuit board, the driving of the vacuum pump is stopped, thereby releasing the chip component from the suction force of the nozzle 23 and Supplied onto the chip land of the printed circuit board.

(Effects of the Invention) As explained above, the present invention provides a nozzle within a camshaft so as to be movable up and down, and urges the camshaft upwardly by the first spring means, and at the same time, the nozzle is moved upwardly by the first spring means. A second spring means having a higher spring pressure than the second spring means is biased upward, and the driving means pushes down the nozzle and the camshaft via the engagement member, and the cam part of the camshaft opens the positioning pawl, After the chip component is sucked and held by the nozzle, when the push-down force by the drive means is released, the nozzle is first raised by the second spring means, and then the camshaft is raised by the spring means of the joint 1, and the positioning pawl is closed. As a result, each positioning pawl pinches the chip component and positions it.

Therefore, with this, it becomes possible to securely hold the chip component by the nozzle and position the chip component by the positioning claw by using only one driving source, and it is also difficult to perform manufacturing and assembly. In other words, by delaying the timing of the closing operation of the positioning claws compared to the rise of the nozzle, the chip components are clamped by the positioning claws, so precision in manufacturing and assembly is not required, and it is possible to increase the size and height. This has the effect of not causing price increases.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of a component holding mechanism in a chip component supplying apparatus according to the present invention, and FIG. 2 is a partially sectional side view showing a conventional component holding mechanism. 10: Mounting plate 11: Bearings 12a, 12b Guide hole 13: Cam shaft 14: Cam portion 15: Relief groove 16: Rotation prevention member 17a, 17b: Protrusion 18: Coil spring 19: Stop collar 20: Stop collar receivers 21a to 21d: Positioning Claws 22a to 22d: Roller 23: Nozzle 24: Engagement member 25: Coil spring 26: Cylinder 27: Cylinder shaft 28: Drive member Patent applicant Oki Electric Industry Co., Ltd.

Claims (1)

[Claims] 1. The bearing is fixed to the mounting plate attached to the robot of the chip component supply device, and the cam part is attached to the bottom.
and a cylindrical camshaft that has an escape groove at the top and is movable up and down within the bearing so that the cam portion projects below the bearing; and a cylindrical camshaft that is always biased upward. a first spring means; two pairs of positioning pawls that are pivotally supported on the lower end of the bearing so that they can be opened and closed as a pair in directions orthogonal to each other, and that are each biased so as to come into contact with the cam portion; a nozzle which is disposed within the camshaft so as to be movable up and down and whose lower part protrudes below the lower end of the cam part; an engaging member protruding outward from the engaging member; a second spring means having a spring pressure greater than that of the first spring means and biasing the nozzle upward via the engaging member; and a driving means for pushing down the nozzle and camshaft through the engaging member, and the driving means pushes down the nozzle and camshaft through the engaging member, opens the positioning pawl by the cam part, and sucks the chip component by the nozzle. After holding, when the pushing down force by the driving means is released, the nozzle rises first by the second spring means, and then the first
A component holding mechanism in a chip component supply device, characterized in that the camshaft is raised by the spring means and the positioning claws are closed, so that each positioning claw pinches the chip component and positions the chip component.