JPS62133301A - Inspecting instrument for outward appearance of conductive work parts - Google Patents

Abstract

PURPOSE:To simplify an inspecting process and to obtain high reliability by placing a part to be inspected and a limit gauge in an electric conduction state when the part to be inspected contacts the limit gauge. CONSTITUTION:The wire pin 1 of the part to be inspected is soldered to a base plate 2-1 to form conductive work parts 2. The inside size of the parallel gap of an outward appearance limit gauge 6 is the rated maximum value of the position shift of the pin 1. Then a reference surface 3-2 of the plate 2-1 is slid in contact with the reference surface 7-2 of a reference jig 7' as shown by an arrow 12 to bring a reference surface 3-1 of the plate 2-1 in contact with the reference surface 7-1 of a reference jig 7. At this time, when the squareness of the pin 1 is within a standard range, the pin 1 does not contact the gauge 6, so no current flows through a continuity meter 8 and a display part 11 does not illuminate. When the squareness is not within the standard range, on the other hand, the pin 1 contacts the gauge 6, so a closed circuit is formed of a power source 10, a signal line 9, the jig 7', the plate 2-1, the pin 1, the gauge 6, and the display part 11, which is powered on to illuminate, displaying a defect in inspection. Thus, reliable inspection is performed efficiently with the extremely simple constitution.

Description

[Detailed Description of the Invention] [(Already Required)] This invention provides, after processing a conductive mechanical part, determining the external dimensions of other parts of the part with respect to a reference surface, and electrically determining the contact with a limit gauge. Inspections are carried out by detecting specific conditions, and the efficiency of inspections is improved.

[Industrial application field]

The present invention relates to an inspection device that is effective for inspecting the position of the wire pin relative to the base plate after brazing the wire pin and base plate in the print head of a wire dot type printer. The present invention relates to an inspection device that detects the acceptability of the shape of an object by electrical continuity based on contact with a limit gauge.

FIG. 3 shows the electrically conductive workpiece 2 in which the wire pin 1 is brazed to the base plate 2-1. For example, in the case of a printer with 12 dots per character, the base plate of the 8r wire pin is 1
Since the two base plates are attached together with permanent magnets in a narrow space, and each of them reciprocates in the direction of arrow 5, it can be manufactured with very high precision. Furthermore, the wire pin brazed in section 4 forms a precise print head, and its positional accuracy has a great effect on print quality, so an accuracy of 100 microns is required, and the shape of the wire pin relative to the base plate is There was a need for an efficient inspection method with accurate positioning.

[Problems to be solved by conventional technology and invention] Conventionally,
To inspect the external dimensions of the wire pin 1, which is the part to be inspected, after being processed by waxing 4-J, a projector is used to enlarge and project the part to be inspected using the side surface or tip of the base plate as a reference plane, and the projected screen is Above, it was visually determined whether or not it was within the standard range.

However, in this method, there is a lot of setup work for inspection, which is poor in work efficiency, and there is a possibility of erroneous determination because it is a visual work.

Therefore, an object of the present invention is to simplify the inspection process and provide a highly reliable inspection method.

[Means for solving problems]

A reference jig that positions the part using a reference surface on the part to be inspected, and when the position of the part is determined by the reference jig, the standard maximum deviation of the external dimension of the part to be inspected is set to the inside. A metal limit gauge is provided for measuring the dimensions, and a continuity detection means is further provided for detecting the presence or absence of electrical continuity between the limit gauge and the part to be inspected, and notifying the result of the acceptability of the outer shape of the part to be inspected.

[For production]

When the part to be inspected comes into contact with the limit gauge in a manner that exceeds the maximum standard value of external dimension deviation, the part to be inspected and the limit gauge become electrically conductive. Therefore, the continuity detecting means connected to both of them is in a conductive state, indicating a test failure, and non-conducting, indicating a test pass.

〔Example〕

The gist of the present invention will be specifically explained below with reference to embodiments shown in the drawings. The same reference numerals indicate the same objects throughout the figures. 1st
The figure shows the main components of one embodiment, and cites a base plate 2-1 and a wire pin 1 that are brazed together as the electrically conductive processed part 2.

In the figure, 1 is a wire pin of the part to be inspected, 2 is a conductive workpiece, 2-1 is a base plate, 3-1 and 3-2 are reference surfaces of the base plate 2-1, 6 is an outer limit gauge, and 7. 7゛ is the reference jig, 7-1.7-2 is the reference surface of the reference jig 7.7゛,
8 is a continuity detection means, 9 is an electric signal line, 10 is a power supply, 1)
is the display section.

This embodiment is a case of inspecting the surface angle of the wire pin 1 with respect to the base plate 2-1. In advance, the outer limit gauge 6 is set at the correct 90° where the wire pin 1 should be with respect to the base plate 2-1.
The reference planes 3-1 and 3 of the base plate are
-2 is positioned by the reference planes 7-1 and 7-2 at 7 degrees with respect to the reference jig 7, the center line of the wire pin is the center line of the parallel gap of the external limit gauge 6, and the center line of the parallel gap of the outer limit gauge 6 is The inner dimensions are taken to be the standard maximum value of the positional deviation of the wire pin. The gauge 6 and jig 7' are made of metal. Continuity detection means 8
is connected between the gauge 6 and the jig 7' via two electric signals vA9, and is composed of a power source 10 and a display section 1) consisting of a light emitting diode. Gauge 6 and jig 7.7
are installed so as to be insulated from each other except through the continuity detection means 8.

After the above preparations, the base plate and wire pins that are brazed to each other are connected to the reference surface 3-2 of the base plate 2-1 using the reference jig 7.
The reference surface 3-1 of the base plate 2-1 is brought into close contact with the reference surface 7-1 of the reference jig 7 by sliding it in the direction of arrow 12 while bringing it into close contact with the reference surface 7-2 of the base plate 2-1.

At this time, when the surface angle of the wire pin 1 is within the standard range, the wire pin does not contact the outer limit gauge 6, so no current flows through the continuity detection means 8 and the display section 1) does not emit light.

However, when it is out of the standard range, the wire pin I contacts the gauge 6, so the power supply 10, signal line 9', reference jig 7',
Base plate 2-1, wire pin 1, gauge 6, signal line 9,
A closed circuit of the display section 1) and the signal line 9 is established, and the display section is energized and lights up to indicate an inspection failure.

FIG. 2 shows a second embodiment in which the parallelism of the wire pin 1 with respect to the base plate 2-1 is inspected. It is the same as FIG. 1 except that the side surface 3-3 of the base plate 2-1 is used as the reference surface, and a reference jig 7° and a limit gauge 6′ are provided correspondingly.

Parallel gaps were used for the gauge gaps of limit gauges 6 and 6°, but square or cylindrical holes could also be used.

A light emitting diode is generally used for the display section 1), but a meter may also be used. The power supply 10 is designed to prevent discharge from occurring in the very small gap between the wire pin and the gauge.
Also, considering the characteristics of the light emitting diode and meter, it is desirable that the voltage be as low as possible.

〔Effect of the invention〕

As described above, according to the present invention, with an extremely simple configuration, highly accurate and reliable inspections can be performed in a short time without requiring any skill, contributing to improving the efficiency of the inspection process. , its practical effects are enormous.

[Brief explanation of drawings]

FIG. 1 is a diagram showing one embodiment of the present invention, FIG. 2 is a diagram showing another embodiment of the present invention, and FIG. 3 is a diagram showing a part to be inspected according to the present invention. In the figure, 1 is a wire pin of the part to be inspected, 2 is a conductive workpiece, 2-1 is a base plate, 3 is a reference surface of workpiece 2, 6 is a limit gauge, 7 is a reference jig, and 7-1 is a standard. The reference surface of the jig 7 and 8 are continuity detection means. Figure 1: Tokou 2: 1 row Figure 2 Figure 3

Claims (1)

[Claims] In the (1) external dimension inspection of the part to be inspected relative to the reference surface (3) on the conductive workpiece (2), a reference jig that positions the part (2) by the reference surface (3) is provided. tool (7), and a metal member whose inner dimension is the standard maximum deviation of the external dimension of the part to be inspected (1) when the position of the part (2) is determined by the reference jig (7). A limit gauge (6) and a conductivity detection means (8) that detects the presence or absence of electrical continuity between the limit gauge (6) and the inspected part (1) and reports the acceptability result of the outer shape of the inspected part. A device for inspecting the external shape of conductive processed parts.