JPH0634973B2 - Outer diameter sorting device for ring-shaped workpieces - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a ring-shaped work selection device for selecting whether a ring-shaped work, for example, a ring varistor or the like has a good or bad diameter.

In recent years, electronic components have become smaller and smaller, and it has become difficult to perform manual work. In particular, the ring varistor has an outer diameter of 10 mm to 15 mm, an inner diameter of 8 mm, and a thickness of 0.8 mm.
It is 1.5 mm, and the base material before firing is easily chipped.

[Conventional technology]

FIG. 4 is an explanatory diagram of a ring-shaped work sorting device in a conventional example. In the figure, a plurality of obstacle pins 21 are provided on a base 20, and a ring-shaped work 1, for example, a ring varistor,
The slit 22 is formed by implanting with a width slightly narrower than the prescribed dimension interval D.

In the ring-shaped workpiece sorting apparatus as described above, the quality is sorted by whether or not the ring-shaped workpiece 1 can pass between the slits 22. When the ring-shaped work 1 passes between the slits 22, there is a case where the ring-shaped work 1 has a crack or a missing portion 10 (see FIG. 3 (a)) with a size smaller than a specified dimension. Further, when the ring-shaped work 1 cannot pass between the slits 22 formed by the obstacle pins 21, there are the specified dimension D and the specified dimension or more.

Next, a case where the electrode 11 as shown in FIG. 3B is printed on the ring-shaped work 1 will be described.

FIG. 5 is an illustration of forming electrodes on a ring-shaped work. Fifth
In the figure, the attachment 20 is provided with a recess 21 having the same depth as the height of the ring-shaped work 1 and a substantially same diameter. Among the ring-shaped workpieces 1 that have not passed the specified dimension D in the sorting device, those having the specified dimension D are inserted into the concave portion 21, and those having the specified dimension D or more are excluded because they do not enter the concave portion 21. It After that, a mask (not shown) in the shape of the electrode 11 is laid on the ring-shaped work 1 and the silver paste 25 is printed by the squeegee 23. After that, the electrode 11 is formed on the ring-shaped work 1 by the reflow soldering process.

[Problems to be Solved by the Invention]

However, even when the ring-shaped work 1 does not pass through the slit 22 formed by the obstacle pin 21 in the sorting device, the missing portion 10 may be included. That is, when the place where the ring-shaped work 1 is selected is as shown in FIG.
Even if there is, it cannot be found and does not pass through the slit 22. The missing portion 10 cannot be found unless it passes through the position shown in FIG.

It is assumed that the silver paste 25 is printed to form the electrode 11 on the ring-shaped work 1 having such cracks or missing portions 10. If the ring-shaped work 1 has a missing portion 10,
As shown in FIG. 5, the silver paste 25 may enter the missing portion 10 and further wrap around the back side of the attachment 20.

If reflow soldering process is performed in such a case,
The silver paste 25 that has entered the missing portion 10 or the back side of the ring-shaped work 1 has a problem of bonding the ring-shaped work 1 and the attachment 20.

In order to solve the above problems, it is an object of the present invention to provide an outer diameter sorting device for a ring-shaped work that can detect a missing portion or a crack that occurs anywhere in the ring-shaped work. .

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the outer diameter sorting device of the ring-shaped work in the present invention is set to be slightly narrower than the outer diameter specified dimension interval of the ring-shaped work, and at least one of them is a rotary roller that gives rotation to the ring-shaped work. From the ring-shaped work selection unit and the transport support unit that makes the axis of the rotating ring-shaped work and the axis of the rotating roller parallel to each other on the ring-shaped work selection unit and supports the ring-shaped work so as not to fall. Composed.

[Work]

The arrangement of the fixed roller and the rotating roller is set to be slightly narrower than the specified outer diameter dimension interval of the ring-shaped work. Then, the ring-shaped work is placed on the roller with the ring-shaped work shaft and both roller shafts parallel to each other. Since at least one roller is rotating, the ring-shaped workpiece rotates on both rollers.

On the other hand, the transport support unit advances the ring-shaped work rotating on both rollers forward and supports it so that it does not fall.

While the ring-shaped work is passing through the sorting section, the rotation of the ring-shaped work can inspect all parts of the outer diameter. That is, when the missing portion of the rotating ring-shaped work reaches the peripheral end portions of both rollers, the ring-shaped work falls without being supported by the peripheral end portions.

Therefore, if there is a missing portion having a short diameter even at one location of the ring-shaped work, this can be sorted as a defective product.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is an explanatory view of an outer diameter sorting device for a ring-shaped work according to the present invention, and FIG. 2 is an explanatory view of a ring-shaped work transfer support portion according to the present invention.

In the figure, a ring-shaped work 1 is placed on a fixed roller 2 and a rotating roller 3 with the axis of the ring-shaped work 1 and the axes of both rollers 2 and 3 in parallel. The spacing between the fixed roller 2 and the rotating roller 3 is set to a dimension slightly smaller than the outer diameter specified dimension 1D of the ring-shaped work 1 to configure the sorting section A.

Further, the ring-shaped work 1 is rotated on both rollers 2 and 3 by the rotation of the rotating roller 3. Fixed roller 2
May be rotated without being necessarily fixed. Further, when it is used as the fixed roller 2 without being rotated, its surface may be processed with Teflon (trademark) or the like to be smooth. If you make the surface of the roller 2 smooth,
Even if there is friction in the missing portion 10 of the ring-shaped work 1 (see FIG. 3 (A)), the ring-shaped work 1 having the specified dimension D or less
Easily falls.

On the other hand, the transport support section B is composed of a conveyor belt 4 having a rotation drive section (not shown) and a ring-shaped work support plate 5. Two ring-shaped work support plates 5 are fixed to the lower portion of the conveyor belt 4 in pairs at equal intervals, and support the ring-shaped work 1 rotating on the rollers 2 and 3 so as to sandwich it. To prevent it from falling and to move forward. Then, the ring-shaped work 1 is supplied between the ring-shaped work support plates 5 by a supply means (not shown), and as described above, moves forward while rotating. Since the conveyor belt 4 moves the ring-shaped works 1 one by one by the ring-shaped work supporting plate 5, it is convenient to rotate the conveyor belt 4 endlessly.

Next, the case of selecting the ring-shaped work 1 will be described. The ring-shaped work 1 is supplied onto the rollers 2 and 3 from a ring-shaped work supply means (not shown). The ring-shaped work 1 is rotated by the rotating roller 3, and while passing through both rollers 2 and 3, it is possible to inspect all parts of the outer diameter. That is, when the missing portion 10 of the rotating ring-shaped work 1 reaches the peripheral end portions 6 of the rollers 2 and 3, the ring-shaped work 1 falls without being supported by the peripheral end portions 6. To do.

Therefore, if there is a missing portion 10 having a short diameter even at one location of the ring-shaped work 1, this can be sorted as a defective product.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. Various design changes can be made without departing from the present invention described in the claims.

For example, in the sorting unit A, if at least one is a rotating roller, the other can be a vertical surface or an inclined surface. Further, in the transport supporting section B, it is possible to arbitrarily use a chain belt instead of the conveyor belt or change the shape of the ring-shaped work supporting plate.

〔The invention's effect〕

According to the present invention, since the ring-shaped work is selected while rotating, it is possible to detect the minor axis portion in all directions in the ring-shaped work.

Further, according to the present invention, both the sorting unit and the ring-shaped work transfer / support unit continuously rotate, so that automatic supply and discharge of the ring-shaped work can be facilitated.

[Brief description of drawings]

FIG. 1 is an explanatory view of an outer diameter sorting device for a ring-shaped work according to the present invention, FIG. 2 is an explanatory view of a ring-shaped work transfer support portion according to the present invention, and FIGS. FIG. 4 is an explanatory view of a ring-shaped work sorting apparatus in a conventional example, and FIG. 5 is an explanatory view of forming electrodes of a ring-shaped work. 1 ... Ring-shaped work 2 ... Fixed roller 3 ... Rotating roller 4 ... Conveyor belt 5 ... Ring-shaped work support plate 6 ... Peripheral end 10 ... Missing part 11 ... Electrode A ... Sorting part B ... Transportation support

Claims (1)

[Claims] 1. A ring-shaped work selection section A, which is set to be slightly narrower than the outer diameter specified dimension interval of the ring-shaped work 1, and at least one of which comprises a rotating roller 3 for rotating the ring-shaped work 1, and the ring-shaped work. On the sorting unit A, the rotating ring-shaped work 1 and the rotating roller are made parallel to each other, and the conveyance support unit B is provided to support the ring-shaped work so as not to fall down. External diameter sorting device for ring-shaped workpieces.