JPH0578393B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a coating apparatus for leadless electronic components that coats markings and the like on leadless resistors, diodes, and the like.

PRIOR TECHNOLOGY The fourth belt-conveyed coating device for leadless electronic components applies cathode band markings or protective coatings to workpieces such as round leadless components.
Apparatus such as the one schematically shown in the figure is commonly used.

The workpiece 54 is carried from right to left by the conveyor belt 53 and passes between the rubber roller 51 rotating in the direction of arrow 55 and the application roller 52 rotating in the direction of arrow 56. Rubber roller 51
gives rotation to the workpiece 54, and the application roller 52 applies coating to the outer circumferential surface of the central part of the workpiece 54.

FIG. 5 is a partial sectional view showing the details. The workpiece 54 is a leadless resistor composed of a cylindrical ceramic bar 58 as a main body and a cap 60 as an electrode part, and only the outer periphery of the ceramic bar 58 is coated with a protective coating. The rubber roller 51 is provided with grooves 61 on its circumference to prevent paint 59 from adhering to it and becoming dirty, and is in contact only with caps 60 on the left and right sides of the workpiece 54. The rubber roller 51 is rotated by a drive device (not shown) to forcibly rotate the workpiece 54. The coating roller 52 coats the paint 59 without directly contacting the outer periphery of the porcelain rod 58.

Problems to be Solved by the Invention In the above device, since the rubber roller 51 is used, if the disk is not flat, rotational wobble will occur, and if it is eccentric, the contact with the cap 60 will be maintained constant. As a result, uneven coating may occur due to poor rotation of the workpiece 54, or the workpiece 54 may become detached from the conveyor belt 53. Further, paint may adhere to the cap 60 of the workpiece 54, which should not be coated with paint, resulting in defective products. Therefore, the rubber roller 51 needs to be manufactured with high precision. However, since the workpiece 54 is very small, it is difficult and expensive to improve the machining accuracy to the extent that rotational vibration and eccentricity are completely eliminated. Since the rubber roller 51 covers the coating surface of the workpiece 54, the state of coating by the coating roller 52 cannot be observed, making it unsuitable for visual inspection.

The present invention was created to solve the above problems, and has a simple structure that allows the workpiece to roll smoothly.
It is an object of the present invention to provide a leadless type electronic component coating device that can perform uniform coating.

Means for Solving the Problems A coating apparatus for leadless electronic components according to the present invention provides a leadless electronic component coating device that applies paint to a main body of a leadless electronic component, which has electrodes at both ends of a cylindrical main body. A coating device for leadless type electronic components, which includes a conveyance level that conveys the leadless type electronic components while being supported in a freely rolling manner, an application roller with paint adhered to the peripheral surface, and the conveyor belt for coating by sandwiching the coating between them. It includes an upper presser plate provided at a position facing the roller, and an elastic body attached to the lower surface of the tip of the upper presser plate, and the tip of the upper presser plate is attached only to the electrode part of the leadless type electronic component. The conveyor belt moves the leadless electronic component with the tip of the upper holding plate in contact with the electrode part, so that the leadless electronic component rotates on its axis. It's summery.

Function When a workpiece is conveyed in a rollable state by a conveyance means such as a conveyor belt, the workpiece rotates due to friction caused by contact with an elastic body, and this prevents paint from adhering to the coating roller. Apply uniformly to the entire surface to be painted.

Embodiment FIG. 3 is an external perspective view of a leadless type electronic component as a workpiece. In the figure, the workpiece 9 is a leadless resistor consisting of a cylindrical porcelain rod 21 as the main body and a cap 22 as the electrode part, and its size is approximately 4 mm in the horizontal and longitudinal direction, and the diameter of the cap 22 is approximately 1.5 mm. It is. Then, the workpiece coating device applies protective coating to the outer periphery of the porcelain bar 21 of the workpiece 9.

FIG. 1 is a sectional view showing an embodiment of the present invention. The workpiece coating device 1 has a rubber plate 2 as an elastic body.
It has a conveyor belt 3 and an application roller 4. The rubber plate 2 is attached to the lower surface of the tip of the upper presser plate 6, and both ends thereof are bent diagonally upward so that the workpiece 9 can smoothly pass thereunder while rolling. And this rubber plate 2 is the arrow 11
The upper presser plate 6 is rotatably supported by a pin 8 so that it can move in the direction of , that is, up and down. A stopper 7 is provided below the intermediate portion of the upper presser plate 6 to prevent the rubber plate 2 from directly touching the conveyor belt 3 when there is no workpiece 9.

FIG. 2 is a partially omitted view of FIG. 1 viewed from above. The conveyor belt 3 is provided with a conveyor hole 5, which is shaped like a flat cross to prevent the marking paint 23 applied around the porcelain bar 21 of the workpiece 9 from adhering to the conveyor belt 3. There is. The tip of the upper presser plate 6 is U-shaped, and the rubber plate 2 is attached to the lower surface thereof. The rubber plate 2 is designed to come into contact only with the left and right caps 22 of the workpiece 9. The rubber plate 2 is notched in a U-shape so as to contact only the cap 22, and an opening 24 is formed in the upper part of the porcelain bar 21. This allows easy visual observation of the state of paint adhesion to the porcelain bar 21, which is convenient for inspections and the like.

Next, the operation will be explained with reference to FIG.

The workpiece 9 carried under the rubber plate 2 is held down by the rubber plate 2 by the weight of the upper holding plate 6. In this state, the workpiece 9 is moved by the conveyor belt 3, so that the workpiece 9 rotates in the direction of the arrow 10 due to friction with the rubber plate 2. Due to this rotational movement of the workpiece 9 and the rotational movement of the coating roller 4 counterclockwise in the figure, the outer periphery of the porcelain bar 21 at the center of the workpiece 9 is coated.

Note that the present invention is not limited to the above-mentioned embodiments, and it is possible to attach a weight to the upper presser plate or use a spring to increase the force with which the rubber plate is pressed against the workpiece. It may have a shape with a rectangular window opening where the coated surface can be seen. Furthermore, although the rubber plate is moved up and down around the pin, it is also possible to move it up and down using other configurations.

Effects of the Invention Since the leadless electronic component is rolled by a conveyor belt that conveys the workpiece by contact with an elastic body, the workpiece can be rotated with a simple structure without using precision rubber rollers. You can get the mechanism. Further, since the elastic body is stationary, uniform coating can be performed without positional deviation or blurring, and a rubber roller drive device is not required, making it possible to construct the coating at low cost. Furthermore, since the elastic body contacts only the electrode portion, which is the rolling surface of the leadless electronic component, the surface to be painted is opened, making it convenient to easily observe the painted state.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is a partially omitted view of FIG. 1 seen from above, and FIG. 3 is an external perspective view of a leadless electronic component as a workpiece. FIG. 4 is a schematic diagram showing a conventional example, and FIG. 5 is a partial sectional view showing its details. 1... Workpiece coating device, 2... Rubber plate, 3...
Conveyor belt, 4...application roller, 24...opening.

Claims (1)

[Claims] 1. In a coating device for leadless electronic components that applies paint to the main body of a leadless electronic component in which electrodes are provided at both ends of a cylindrical main body, the leadless electronic component is supported in a rollable manner. a conveyor belt that conveys the paint, a coating roller with paint adhered to its circumferential surface, an upper presser plate provided at a position facing the applicator roller with the conveyor belt in between, and an upper presser plate attached to the lower surface of the tip of the upper presser plate. The tip of the upper holding plate is cut into a U-shape so as to contact only the electrode part of the leadless type electronic component, and the conveyor belt is provided with an elastic body that is attached to the electrode part of the upper holding plate. 1. A coating device for a leadless electronic component, characterized in that the leadless electronic component rotates by moving the leadless electronic component in contact with the leading end of the leadless electronic component.