JPH0366113A - Checking of absence of rubber in electrolytic capacitor and device therefor - Google Patents

Abstract

PURPOSE:To detect the existence of rubber with certainty irrespective of the size of diameter by moving an electrolytic capacitor in the prescribed direction with a pair of lead wires being held and making the case of the electrolytic capacitor pass through the moving path of capacitor while coming into contact with a friction plate which is provided in the vicinity of its moving path and then, detecting the rotation of the above case after providing rotation force to its case. CONSTITUTION:Generally each polarity indication mark 7 is attached at the outside surface of each electrolytic capacitor case (c) and the indication marks 7 are fitted for assembly so that they have constant directions with respect to a pair of lead wires (l). Once each case (c) passes between the friction plate 32 and a roller 36 and friction force generated between the case (c) and the friction plate 32 makes each electrolytic capacitor move right and left, rotation force acts clockwise on the case (c) and then, the case rotates in the same direction. As a result, each mark (m) which is observed at the back side of the forward direction moves to the upper side. When this mark (m) is detected by a detecting element 4, it is detected that the case (c) rotates. Then, the lack of rubber in this capacitor is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method and apparatus for inspecting the presence or absence of sealing rubber in an electrolytic capacitor.

(b) In the manufacturing process of conventional electrolytic capacitors, an element made of layered electrode foil and insulating paper is placed in a case, a sealing rubber is sealed in the opening of the case, and the open end of the case is closed. It is tightened to seal the inside. A pair of lead wires extending from the element pass through the sealing rubber. In such a manufacturing process, it is necessary to inspect whether the sealing rubber is properly inserted into the open end of the case.

Conventional methods for inspecting the presence or absence of such sealing rubber include visual inspection by humans or optical inspection using a phototube.

However, for small capacitors with a small outer diameter (outer diameter of the case) of 3 mm to 5 mm, the opening (opening after caulking) of the case C of the finished capacitor a as shown in Figure 3 is The diameter of the lead wire and the spacing P between the roots become smaller, making visual inspection by humans difficult.In addition, centering accuracy is important for detection with a phototube, or maintaining high accuracy. There is a problem in that this is difficult and many misjudgments occur.

By the way, capacitor element e has case C and inner 11111
However, since the connection is through thin metal/metal foil, the capacitor element and lead wires are fixed to the case due to the frictional resistance between the case and the sealing rubber due to caulking at the open end of the case. 6. Therefore, if the sealing rubber is not attached, the case will easily move if the lead wire is held and the case is moved in the rotational direction.

(c) Problems to be Solved by the Invention The problems to be solved by the present invention are, in view of the above facts and the fact that the absence of sealing rubber in electrolytic capacitors is an important defect, by rotating the case with respect to the lead wire. To be able to reliably detect the presence or absence of rubber regardless of the size of the diameter.

(d) Means for Solving the Problems The rubber-free inspection method for electrolytic capacitors according to the present invention involves moving an assembled electrolytic capacitor in a predetermined direction while holding a pair of lead wires, and moving the electrolytic capacitor through a transfer path. The case of the electrolytic capacitor is passed through it while in contact with the ItJ friction plate provided close to the ItJ, thereby applying rotational force to the case, and by detecting the rotation of the case, the absence of rubber is detected. ing.

The rubber-free inspection device for an electrolytic capacitor according to the present invention includes a transfer device that moves an electrolytic capacitor while holding its lead wire, and a transfer device that is placed in the middle of the transfer path of the electrolytic capacitor and that contacts the case of the electrolytic capacitor to detect the presence of rubber. It consists of a friction plate that applies rotational force to the case, and a detection device that detects the rotation of the case.

(E) Effect In the above configuration, when the case comes into contact with the friction plate while the electrolytic capacitor is being transferred, a rotational force acts on the case due to friction. If no rubber is installed within the case, the case will easily rotate with respect to the leads and capacitor element. This rotation of the case is detected by a detection device.

In the present invention, the presence or absence of rubber is detected by rotating the case with respect to the capacitor element and lead wire, so even if visual inspection or optical inspection using a phototube is difficult, it can be detected reliably regardless of the diameter.

(F) EXAMPLE The practical principle of the present invention will be explained below with reference to the drawings.

In FIGS. 1 and 2, a device 1 is shown in solid outline for the detection method of the invention. This device 1 includes a transfer device 2 for moving an electrolytic capacitor, a rotational force applying device 3 that is provided in the middle of the transfer path of the electrolytic capacitor and applies rotational force to a case C of the electrolytic capacitor, and a rotation force applying device 3 for detecting rotation of the case. A detection device 4 is installed at the bottom of the tank.

In this practical principle, the transfer device 2 is designed to hold the lead wires of a large number of electrolytic capacitors with a pair of tapes t, and to transfer the electrolytic capacitors by transferring the tapes t. Therefore, the transfer device 2 includes a drive roller 21 and a pressure roller 22 that sandwich and pull the tape t, a motor 23 that drives the drive roller 21, and a guide roller 24. The drive roller 21 is provided with a plurality of convex portions 25 spaced apart in the circumferential direction so that the convex portions 25 enter holes formed at predetermined intervals in the tape t to ensure feeding of the tape.

The rotational force applying device 3 includes a stand 31 disposed at Shimonoseki on the transfer path of the electrolytic capacitor, a friction plate 32 rotatably attached to the stand 31 with a pin 33, and a spring 34 that presses the friction plate 32. It is provided with rotatable rollers 36 that sandwich the case C in cooperation with the friction plates.

The detection device 4 is provided on the downstream side of the rotational force applying device 3, and has a known structure for optically detecting the polarity display mark 7m attached to the outer surface of the case C.

In the above configuration, the electrolytic capacitor is transported by transporting the tape t in the direction of the arrow by the transporting device 2 while holding the lead wire on the tape t. There is usually a polarity mark 7 on the outside of the case C of an electrolytic capacitor.
m is attached, and the polarity display mark is assembled so that it is oriented in a fixed direction with respect to the pair of lead wires 1 (for example, in this embodiment, it corresponds to the arrangement direction of the pair of lead wires).

When the case C of the electrolytic capacitor passes between the friction plate 22 and the roller 26, the friction force between the case C and the friction plate 22 causes the electrolytic capacitor to move to the right as shown in FIG. A clockwise rotational force acts on C, and the case rotates in the same direction. Therefore, the mark 7m, which was on the rear side in the direction of travel, moves upward. This mark 7m is detected by the detection device 4 to detect that the case C has rotated and therefore that the rubber is not installed.

For electrolytic capacitors equipped with a rubber cap, the mark will not move because the case cannot be rotated low or low due to the rotational force caused by the friction between the case and the friction plate.

(g) Effects The present invention can produce the following effects.

■ Even in small-diameter electrolytic capacitors that are difficult to detect by visual inspection, defects without rubber can be reliably detected.

■ Continuous inspection becomes possible through image processing.

■ Can be detected at low cost.

■ The misalignment of the polarity indicator mark on the case can also be detected at the same time.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view of an apparatus for carrying out the rubber-free inspection method according to the present invention, FIG. 2 is a survey view of the rotational force applying device, and FIG.
The figures show an electrolytic capacitor, in which [A] is a surface view, CB) is a sectional view, and [C] is a bottom view. 1: Rubber free inspection method 2: Transfer device 3: Rotating force applying device 32: Friction plate 4: Detection device

Claims (2)

[Claims] 1. The assembled electrolytic capacitor is held by a pair of lead wires and moved in a predetermined direction, and the case of the electrolytic capacitor is brought into contact with a friction plate provided close to the transfer path of the electrolytic capacitor while passing through it. A rubber-free inspection method characterized in that the absence of rubber is detected by applying rotational force to the case and detecting the rotation of the case. 2. A device for detecting the presence or absence of rubber installed in the case of an electrolytic capacitor includes a transfer device that holds the electrolytic capacitor by its lead wire and moves it, and a transfer device that is placed in the middle of the transfer path of the electrolytic capacitor. a friction plate that contacts the case and applies rotational force to the case;
A rubber-free inspection device comprising: a detection device for detecting rotation of the case.