JPH0614811Y2 - Coating equipment for cylindrical electronic components - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a coating device for a cylindrical electronic component.

[Conventional technology]

As is well known, in general, in electronic parts formed in a columnar shape such as resistors and capacitors, coating is applied to the outer peripheral surface of the electronic parts for insulation or type indication. Yes, conventionally, the application of this paint,
A coating device as shown in FIG. 7 is used.

That is, in this conventional coating apparatus, a pinch roller 31 and a paint coating roller 32 are arranged in a transfer path 30 for transferring the electronic component A in a direction orthogonal to its axis so as to sandwich the electronic component A from above and below during the transfer. At the same time, the paint supply roller 34 is pressed into contact with the outer peripheral surface of the paint application roller 32, and the lower portion of this paint supply roller is placed in the paint tank 33.
The paint supply roller 34 and the electronic component A are rotated together with the paint application roller 32 by rotating the paint application roller 32, so that the paint B in the paint tank 33 is replaced with the paint supply roller 34.
From the coating material application roller 32 to the electronic component A in sequence, the coating material application roller 3
I paint it with the same width as 2.

However, in the structure in which the paint supply roller 34 is brought into pressure contact with the paint application roller 32 in this way, as shown in FIG. 8, the paint B is pushed or excessively spread toward the end surface of the paint application roller 32. As a result, the paint B does not uniformly adhere to the outer peripheral surface of the paint applying roller 32, but is unevenly adhered to a portion near the end surface as shown in FIG. There are many occurrences of such a phenomenon that the coating of the electronic component A becomes uneven, resulting in a defective coating at a fairly high rate. In particular, this problem becomes more prominent as the width of the paint coating roller 32 increases.

Further, the paint supply roller 34 is formed of a relatively soft material such as Teflon due to the adhesiveness of the paint and the like, and wears only the contact portion with the paint application roller 32 during continuous use, so that the paint There is also a problem in that the supply roller 34 has to be frequently replaced, and maintenance of the apparatus is troublesome and costly.

[Problems to be solved by the device]

By the way, as disclosed in Japanese Utility Model Laid-Open No. 50-18757, a gap is provided between the outer peripheral surface of the paint supply roller and the outer peripheral surface of the paint coating roller to control the thickness of the transferred paint. However, even in this case, it is difficult to finely adjust the thickness of the paint that has adhered to the outer peripheral surface of the last paint application roller, and the end surface of the paint supply roller or the paint application roller is difficult to adjust. Since the paint that dripped onto and adhered to the surface cannot be removed, the thickness of the paint at the corners of the end surface and the outer peripheral surface of the paint supply roller or paint application roller becomes thicker, and this adheres to the outer peripheral surface of the electronic component. However, the problem of uneven coating of electronic parts cannot be solved.

SUMMARY OF THE INVENTION It is an object of the present invention to solve this technical problem, and to provide a coating device for electronic parts, which can reduce the wear of the coating supply roller and reduce the defective coating rate.

[Means for Solving the Problems]

In order to solve this problem, a coating device for electronic parts of the present invention comprises a pinch roller and a rotary drive type paint applying roller which are arranged so as to sandwich a cylindrical electronic part being transferred, and the outer periphery of the paint applying roller. A rotary drive type paint supply roller adapted to transfer and supply the paint to the surface, and the paint supply roller is arranged in close proximity with an appropriate gap between the outer peripheral surface and the outer peripheral surface of the paint application roller. Then
A scraper is arranged in close proximity to the outer peripheral surface of the paint supply roller and the outer peripheral surface of the paint application roller, and a notch in the scraper is formed so as to be close to the outer peripheral surface of the paint supply roller. It is configured such that the coating material is adhered only to the outer peripheral surface in an appropriate thickness.

[Function and effect of device]

The paint used for this type of coating has a relatively high viscosity and has a certain thickness when attached to the outer peripheral surface of the paint supply roller. By setting the gap to a value that is smaller than the thickness of the paint that has adhered to the paint supply roller, that is, the outer peripheral surface of the paint application roller touches the paint but does not contact the outer peripheral surface of the paint supply roller. By setting various dimensions, the paint is continuously transferred and supplied from the outer peripheral surface of the paint supply roller to the outer peripheral surface of the paint application roller as the paint supply roller and the paint supply roller are driven to rotate. The outer peripheral surface of the electronic component is painted.

In that case, a gap is formed between the outer peripheral surfaces of the paint applying roller and the paint supplying roller, and the scrapers are arranged close to the outer peripheral surfaces of both rollers, and one scraper has a cutout portion. However, since the notch is brought close to the outer peripheral surface of the paint supply roller, the paint adhering to the end surface of the paint supply roller can be scraped off. The thickness of the paint is not generated so as to rise at the corner with the outer peripheral surface, and therefore, even when the paint is transferred from the paint supply roller to the paint application roller, the excess paint is prevented from adhering. And
With these scrapers, the paint that has adhered to the outer peripheral surface of the paint supply roller and the outer peripheral surface of the paint application roller in an excessive thickness is scraped off by the scraper, and only the outer peripheral surface of these rollers adheres the paint to an appropriate thickness. Because it will
The paint does not stick out toward the end face of the paint applying roller or is stretched excessively thinly, and the paint can be attached to the entire outer peripheral surface of the paint applying roller with a uniform thickness.

Therefore, the coating of the electronic parts can be evenly performed by the width of the coating roller. Further, since the paint applying roller and the paint supplying roller are not in contact with each other and the paint supplying roller is not worn at all, it is possible to maintain a uniform and even coating state without frequent replacement of the paint supplying roller. Become.

Therefore, according to the present invention, the defective coating rate of electronic parts can be significantly reduced, and the labor and cost required for maintenance of the coating apparatus can be reduced.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings (FIGS. 1 to 6). In the drawings, reference numeral 1 indicates a belt type conveying device as an example of a transfer means for a cylindrical electronic component A, and reference numeral 2
Shows the coating devices provided in the transfer path of the electronic component A, respectively.

The belt type transport device 1 includes a rail 4 mounted on a machine frame 3.
And an endless belt 5 disposed above the rail 4, and an engagement hole 6 for fitting the electronic component A into the endless belt 5 in a direction orthogonal to the moving direction of the endless belt 5.
The electronic parts A are transported in a direction orthogonal to the axis of the electronic parts A by piercing the parts with a constant pitch. The electronic component A is formed such that both ends thereof have a large diameter and the middle portion has a small diameter.

The coating device 2 is composed of a pinch roller 7 and a paint applying roller 8 which are arranged above and below the belt type conveying device 1 and a paint supplying roller 9 which is arranged obliquely below the paint applying roller 8. The paint supply roller 9
A gap having an appropriate dimension e is formed between the outer peripheral surface and the outer peripheral surface of the paint applying roller 8 so as to be close to the paint applying roller 8. The lower end of the paint supply roller 9 is immersed in the paint B in the paint tank 10.

The pinch roller 7 is rotatably supported by the machine frame 3, and elastic rings 7a made of rubber or the like are fitted to the portions near both end surfaces to elastically move the front and rear large diameter portions of the electronic component A during transfer. It is configured to be pressed to. On the other hand, the paint applying roller 8 has such a width that it fits inside the small diameter portion of the electronic component A, and the upper end portion thereof is projected above the rail 4 through the cutout hole 4a to form the outer peripheral surface of the small diameter portion of the electronic component A. It is configured so as to contact the lower part from below. The paint application roller 8 is a machine frame 3
It is rotationally driven by a motor 11 with a reduction gear fixed to the back surface of the.

The paint supply roller 9 is rotatably supported by a support arm 12 which is rotatably supported by the machine frame 3 in a vertically rotatable manner. The support arm 12 is biased upward by a spring 13 and is also supported by a bracket 14. By bringing the screwed bolt 15 into contact with the upper surface of the support arm 12, the paint application roller 8
The clearance gap e between and is adjustable.

Then, a flat belt 16 is hung on the rotary shaft of the paint supply roller 9 and the rotary shaft of the paint application roller 8 via pulleys 17 and 18, respectively. Is rotated in the opposite direction by the motor 11. In this case, the ratio of the diameter of the pulley 17 on the rotating shaft of the paint applying roller 8 to the diameter of the pulley 18 on the rotating shaft of the paint supplying roller 9 is defined as the ratio of the diameter of the paint applying roller 8 to the diameter of the paint supplying roller 9. By setting the same as above, the peripheral speeds of the paint applying roller 8 and the paint supplying roller 9 are made to be the same.

A scraper 19 for scraping off the excess paint B is applied to the paint applying roller 8 and the paint supplying roller 9 so that the paint B having a constant thickness adheres only to the outer peripheral surfaces thereof.
20 is fitted from the side. This scraper 19,2
As shown in FIG. 4 and the like, 0 has a notched portion such as a U-shape in plan view, and these notched portions are brought close to each other along the outer peripheral surface of the paint applying roller 8 and the outer peripheral surface of the paint supplying roller 9. To form.

In the above configuration, the paint B has a certain degree of viscosity,
Since the surface tension causes a constant thickness to adhere to the outer peripheral surface of the paint supply roller 9, the gap e between the outer peripheral surfaces of the paint supply roller 9 and the paint application roller 8 is equal to Is set to a size (for example, about 0.2 to 0.5 mm) such that the paint coating roller 8 and the paint supply roller 9 are not contacted with the paint coating roller 8 and the paint supply roller 9 are rotated. Thus, the paint B in the paint tank 10 can be continuously transferred from the paint supply roller 9 to the paint application roller 8. Also, at least the paint supply roller 9
Coating material B adhered to the outer peripheral surface of the coating material supply roller 9 at the notches in the scrapers 19 and 20 arranged on the outer peripheral surface of the coating material B.
Can be scraped off so as to limit the thickness of the paint supply roller 9, and the paint adhered to the end face side of the paint supply roller 9 is also scraped off, so that the paint thickness rises at the corners between the end face of the paint supply roller 9 and the outer peripheral surface. Therefore, even when the paint is transferred from the paint supply roller 9 to the paint applying roller 8, the excess paint is prevented from adhering. Then, the paint adhered to the outer peripheral surface of the paint supply roller 9 and the outer peripheral surface of the paint applying roller 8 with an excessive thickness is scraped off by the scrapers 19 and 20, and only the outer peripheral surfaces of these rollers have a proper thickness. Since the coating material is adhered only to the coating material, the coating material does not stick out toward the end surface of the coating material application roller 8 or is stretched excessively thinly, and the coating material is applied to the entire outer peripheral surface of the coating material application roller 8 with a uniform thickness. You can

As a result, the outer peripheral surface of the small-diameter portion of the electronic component A pinned by the pinch roller 7 is coated with a constant thickness.

Therefore, while the paint applying roller 8 and the paint supplying roller 9 are rotationally driven, the electronic component A is intermittently transferred, whereby the electronic component A is continuously coated.

As described above, the scraper 19 which forms a gap between the paint applying roller 8 and the paint supplying roller 9 and is disposed on the outer peripheral surface of the paint applying roller 8 and the outer peripheral surface of the paint supplying roller 9.
Since the excess paint is scraped off to 20, the paint B is not biased toward the end face of the paint applying roller 8 or is not extended too thinly, and a substantially uniform thickness is maintained as shown in FIG. Since it comes into contact with the outer peripheral surface of the paint applying roller 8,
The paint B continuously adheres to the entire outer peripheral surface of the paint applying roller 8 with a uniform thickness, and the electronic component A is evenly and uniformly applied.

Note that the paint applying roller and the paint supplying roller may be rotationally driven by other methods such as driving by different motors, respectively, and other means such as a chain type may be adopted as a transfer means for electronic parts. Not to mention good things. In addition, in order to prevent the coating of electronic parts from becoming excessively thick when the transfer of electronic parts is stopped for a long time, the paint application roller is configured to be freely accessible to and away from the electronic parts. May be separated from the electronic component after a stagnation for a certain period of time. In this case, since a gap is formed between the paint applying roller and the paint supplying roller, the paint supplying roller is adversely affected. The paint application roller can be moved extremely easily without using it.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 6 show an embodiment of the present invention, FIG. 1 is a front view of a coating apparatus, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. Fig. 1 is a plan view taken along line III-III, Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 1, Fig. 5 is an enlarged view of main parts, and Fig. 6 is VI-VI in Fig. 5.
FIG. 7, FIG. 8, FIG. 9 and FIG. 1 ... Belt type conveying device as an example of electronic component transferring means, 2 ... Coating device, 3 ... Machine frame, 4 ... Rail, 5 ...
... endless belt, 7 ... pinch roller, 8 ... paint application roller, 9 ... paint supply roller, 10 ... paint tank, 19,
20 …… Scraper.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A pinch roller arranged to sandwich a cylindrical electronic component being transferred and a rotary drive type paint applying roller, wherein the paint is transferred and supplied to the outer peripheral surface of the paint applying roller. In a coating apparatus including a drive-type paint supply roller, the paint supply roller is arranged in close proximity to the outer peripheral surface of the paint application roller so that there is an appropriate gap between the outer surface and the paint supply roller. The scraper is arranged in close proximity to the outer peripheral surface of the coating material application roller and the outer peripheral surface of the coating material application roller, and the notch in the scraper is formed so as to be close to the outer peripheral surface of the coating material supply roller. A coating device for a cylindrical electronic component, characterized in that it is configured so that the coating material is applied in an appropriate thickness.