JPS6335361Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a probe that measures the number of threads in a screw hole cut into a member.

Conventionally, the machining depth of a female screw installed in a component was measured by inserting a gauge into the screw hole and reading the standard line. There was a problem that not only was the measurement time-consuming, but also measurement errors occurred.

In view of these problems, the present invention has been developed by directly counting the number of threads of the female screws threaded into the member.
The purpose of the present invention is to provide a new probe for measuring the number of threads that can be reliably and automatically measured.

In other words, the feature of the present invention is that the light is interrupted by the front and rear slopes of the screw mount, and a pulse signal is output in response to this.The details of the present invention are described below. The explanation will be based on the illustrated example.

1 and 2 are configuration diagrams of an apparatus showing an embodiment of the present invention, and the reference numeral 1 in the figures is a measuring probe which is a characteristic part of the present invention, and a light emitting element L is attached to one end.
The two optical fibers 2 and 3 connected to the light receiving element S and the light receiving element S are respectively connected to the irradiation port 6 and the light receiving port 7 at the other end through a through hole 5 formed in the cylindrical holder 4, and these irradiation ports 6 and light receiving port 7
are perforated almost perpendicularly to the front slope T of the threaded hole H to be tested so as to form a specular reflection relationship with the front slope T of the screw thread, so as to be adjacent to each other on the outer circumferential surface of the holder 4 near the tip; Here, the other ends of the optical fibers 2 and 3 are connected so that their optical axes are oriented obliquely to the axis of the holder, that is, the front slope T of the screw hole H,
Alternatively, it is inserted and fixed so as to be substantially perpendicular to the rear slope S. In addition, the reference numeral 8 in the figure indicates a pulse counter 10 that counts the output signal from the light receiving element S converted into a pulse signal through a waveform shaping circuit 9, and a display device that displays the signal from the pulse counter 8 and at the same time determines the quality. are shown respectively.

In this embodiment, when the measurement probe 1 is inserted into the screw hole H to be inspected, the light sent from the light emitting element L passes through one of the optical fibers 2, exits from the irradiation port 6 of the holder, and reaches the front slope of the screw thread. T (FIG. 3A), the light is specularly reflected toward the light receiving port 7, passes through the other optical fiber 3, enters the light receiving element S, and outputs a high-level signal. As the probe 1 advances further, the irradiation port 6 is positioned on the rear slope G of the screw thread, blocking the light to the light receiving port 7 (Figure 3 B), and switching the signal from the light receiving element S to low level. Waveform shaping circuit 9
One pulse is output from the pulse counter 8, and the pulse counter 8 counts "1". While repeating such a process, when the probe 1 reaches the bottom of the screw hole H, the number of screw threads is displayed on the display device 10, and the quality is determined at the same time.

In the above-described embodiment, the measurement probe and the photoelectric conversion element are connected by an optical fiber, but the photoelectric conversion element may be built into the probe.

As explained above, according to the present invention, the light is interrupted by utilizing the difference in the inclination angle between the front slope and the rear slope of the screw mount, so that the light can be simply inserted into the screw hole without directly contacting the screw. The number of screw threads can be measured accurately and quickly by simply inserting a probe into the screw hole, making it possible to automate the inspection of screw holes.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a device showing an embodiment of the present invention, FIG. 2 is a sectional view of the same device, and FIGS. 3A and 3B are explanatory diagrams showing the operation of the same device. 1... Probe, 2, 3... Optical fiber, 4
...Holder, 6...Irradiation port, 7...Light receiving port, 8
...Pulse counter, L...Light emitting element, S...Light receiving element.

Claims (1)

[Scope of utility model registration request] An irradiation port and a light receiving port are provided in the radial direction close to each other near the tip of the cylindrical holder, and the other ends of two optical fibers, one end of which is connected to a light emitting element and a light receiving element, respectively, are connected so that their optical axes are An optical screw number measuring probe inserted into the irradiation port and the light receiving port so as to face obliquely with respect to the axis of the holder.