JPH0829105A - Thread measuring apparatus - Google Patents

Abstract

PURPOSE:To provide a thread measuring apparatus which enables inspecting of an effective diameter of a threaded hole and measuring of the depth of the thread thereof simultaneously with high working efficiency during the measurement. CONSTITUTION:A gauge driver 1 connected to a control unit 2 is provided with a manual switch 3 to operate a motor 11 and a pass thread gauge 8 having a male thread part 7 is mounted at the tip of a tapered shaft 6 through an adaptor 9. The motor 11, a gear 12 for transmitting a rotating force of the motor and a torque switch 14 are housed into gauge driver 1. The gauge driver 1 is made up of a spindle 17 which is made free to slide in the direction of extending of the pass thread gauge 8 for measuring a distance between the gauge driver 1 and work W, an adjusting screw 18 screwed into the end part of the spindle 17 and a spring 19 to energize the spindle 17 to the side of the work. The gauge driver 1 is provided with a measuring window 24 having a graduation inscribed on the periphery thereof and a pointer 25 is provided at the part of the measuring screw 18 corresponding to the measuring window 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device capable of simultaneously inspecting the effective diameter of a screw hole and measuring the screw depth.

[0002]

2. Description of the Related Art Conventionally, as a screw measuring device of this type,
The one shown in FIG. 6 is known (Table 1-5015).
No. 72). That is, the screw measuring device is provided with a through screw gauge 82 extending from one end of the housing 81, and a cylindrical holder 83 slidably fitted in the housing 81 and covering the outer periphery of the through screw gauge 82. Cage,
The holder 83 is biased in a direction extending from the housing 81, and an indicator scale 84 is provided around the holder 83.

In such a screw measuring device, the effective diameter of the screw is inspected by rotating the housing 81 and screwing the passage screw gauge 82 into the screw hole of the work W, and at the same time, the holder 83 in the housing 81 is also inserted. The screw depth is measured by reading the amount of retreat from the indicator scale 84.

[0004]

However, in such a conventional screw measuring device, as the screw hole becomes deeper, the amount of rotation of the housing 81 at the time of measurement increases, so that the work efficiency at the time of measurement becomes higher. It was bad. For the same reason, there is a problem that the burden on the measurer is large, especially when the line is used in a factory.

The present invention has been made in view of such conventional problems, and provides a screw measuring apparatus which has good working efficiency during measurement and which can simultaneously inspect the effective diameter of a screw hole and measure the screw depth. The purpose is to provide.

[0006]

In order to solve the above-mentioned problems, according to the present invention, a through screw gauge screwed into a screw hole opened in a work and a motor for rotating the through screw gauge with a predetermined torque are provided. The gauge driver body is provided with measuring means for measuring the distance between the gauge driver body and the work when the thread gauge is screwed into the screw hole as described above.

Further, the measuring means has a probe contacting the work, is slidable in the extending direction of the thread gauge as described above, and is urged toward the work, and the spindle is interlocked with the spindle. And a scale provided on the gauge driver main body, which indicates the position of the spindle.

Alternatively, the measuring means has a probe contacting the work, is slidable in the extending direction of the thread gauge, is biased toward the work, and the position of the spindle. To a quantity of electricity, and after calculating the position of the spindle from the quantity of electricity converted by the differential transformer, a calculation for calculating the distance between the gauge driver body and the work. And a display unit for displaying the calculation result of the calculation unit.

Alternatively, the measuring means includes a light emitting means for emitting a laser beam toward the work, a light receiving means for receiving a laser beam reflected from the work and detecting a light receiving position of the laser beam, and the light receiving means. The calculation means is configured to calculate the distance between the gauge driver main body and the work from the light receiving position detected by the means, and the display means for displaying the calculation result of the calculation means.

Further, the measuring means includes a transmitting means for transmitting an ultrasonic wave toward the work, a receiving means for receiving an ultrasonic wave reflected from the work, and the ultrasonic wave transmitted from the transmitting means. A calculation unit that measures the time until it is received by the reception unit and calculates the distance between the gauge driver main body and the workpiece from this time and the propagation velocity of the ultrasonic wave, and displays the calculation result of the calculation unit. And display means for

[0011]

In the above structure, the through screw gauge is pressed against the opening of the screw hole that opens in the work, and the probe of the spindle is brought into contact with the work. In this state, measure the distance between the gauge driver body and the work by the measuring means, record this measured value, or reset the measured value,
Rotate the motor. At this time, the through thread gauge is rotated with a predetermined torque, and the through thread gauge is not screwed into the threaded hole when the effective diameter of the threaded hole is smaller than a predetermined value. If the effective diameter of the screw hole is within the tolerance, the screw hole is screwed into the screw hole. Then, following this, the through screw gauge is screwed into the depth of the screw hole according to the rotation of the through screw gauge, and the gauge driver main body also moves to the work side. Eventually, the tip of the threaded thread gauge reaches the end of the threaded hole, and the rotation of the threaded thread gauge stops. Along with this, the movement of the gauge driver body to the work side also stops. In this state, the measuring means measures the distance between the gauge driver main body and the work. This measurement result is compared with the above-mentioned measurement value before the threaded thread gauge is screwed in to measure the amount of movement of the gauge driver main body to the work side, that is, the thread depth. Further, when the through-thread gauge is screwed into the screw hole, the through-thread gauge is screwed with a predetermined torque, so that an error due to a difference in torque at the time of screwing is eliminated from the measurement result.

Further, even in the constitutions of claims 2 to 5, the same operation as described above is achieved, and the constitutions of claims 3, 4 and 5 are achieved.
In the above configuration, the display by the display means is not limited to the distance between the gauge driver main body and the work. For example, just before the tip of the through screw gauge is screwed into the screw hole and at the end of the screw hole. It is also included that the thread depth is calculated from each of the distances from the time point when the value reaches and the result of this operation is within a predetermined allowable range.

[0013]

【Example】

(First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the screw measuring device according to the present invention includes a gauge driver 1 and a control unit 2 which is connected to the gauge driver 1 and controls the gauge driver 1. The gauge driver 1 has the same appearance as an electric screwdriver that is generally used in a factory, and a manual switch for rotating the motor 11 (described later) in the forward, reverse, and reverse directions on the peripheral surface on one end side. 3 is provided. At the other end of the gauge driver 1, a thread gauge 8 having a threaded portion 7 at the tip of the tapered shaft 6 is detachably mounted via an adapter 9.

Further, inside the gauge driver 1, a motor 11, a gear 12 for transmitting the rotational force of the motor 11 to the thread gauge 8 as described above, and an idling when a torque larger than a predetermined value is applied, the thread gauge 8 side. The torque switch 14 includes a torque limiter that cuts off the transmission of rotation to the motor and a torque switch 14 that is a stop switch that mechanically operates to stop the motor 11 when the torque limiter spins.

On the other hand, a hollow bulging portion 15 is formed on the peripheral surface of the gauge driver 1, and inside the bulging portion 15, the distance between the gauge driver 1 and the work W is measured. A measuring means is provided. The measuring means is supported by a guide 16 and is slidable in the extending direction of the thread gauge 8 as described above, an adjusting screw 18 screwed into an end of the spindle 17, and an adjusting screw 18. The adjusting screw 18 and the spindle 17 are integrated with each other via a pointer 25 that is movably fitted to the outside, and a spring 19 that urges the spindle 17 toward the work W side. A guide groove 2 extending in the longitudinal direction of the spindle 17 is provided on the side surface of the spindle 17.
0 is formed in the guide groove 20, and the guide 16
By inserting the rotation prevention pin 21 that penetrates
The careless rotation of the spindle 17 is restricted. Further, at the tip of the spindle 17, there is provided a tracing stylus 22 that comes into contact with the work W when the thread hole H is inspected by the gauge driver 1. As shown in FIG. 2, on the surface of the bulging portion 15, a measurement window 24 in which the movement of the spindle 17 can be observed and a scale 23 is engraved on the peripheral edge is provided, and corresponds to the measurement window 24. The pointer 25 indicating the scale 23 is externally fitted to the adjusting screw 18 at the position of the adjusting screw 18.

In the present embodiment having the above-mentioned structure, when the screw hole H is inspected and the screw depth D is measured by using the gauge driver 1, first, the through screw gauge 8 is screwed on the work W. Spindle 1 while pressed against hole H
The measuring element 22 of No. 7 is brought into contact with the work W, and the adjusting screw 18 is rotated to adjust the pointer 25 to the zero position of the scale 23. Then, the manual switch 3 is operated to the forward rotation position, and the passing screw gauge 8 is rotated by the motor 11.
At this time, since the thread screw gauge 8 is rotating via the torque switch 14, it always rotates with a predetermined torque. When the effective diameter of the screw hole H is within the tolerance, the through screw gauge 8 is screwed into the screw hole H without difficulty. On the other hand, when the effective diameter of the screw hole H is smaller than the tolerance range, the predetermined torque is applied to the through screw gauge 8 and the torque limiter of the torque switch 14 idles, so that the through screw gauge 8 is screwed. Never. In this way, the effective diameter of the screw hole H can be inspected from the results of both of the above.

When the effective diameter of the screw hole H is within the tolerance, the screw depth D can be measured simultaneously with the inspection of the effective diameter. That is, the through screw gauge 8 screwed into the screw hole H is screwed into the depth of the screw hole H as the through screw gauge 8 rotates, and accordingly, the gauge driver 1 also moves to the work W side. Eventually, the tip of the through screw gauge 8 reaches the end of the screw hole H,
The rotation of the thread screw gauge 8 is stopped by the operation of the torque switch 14. Along with this, the movement of the gauge driver 1 to the work W side is also stopped. In this state,
The scale of the displacement amount of the pointer 25 fitted on the spindle 17
Read from. Thereby, the movement amount of the gauge driver 1 to the work W side, that is, the screw depth D can be measured.

As described above, according to the screw measuring device of the present embodiment, when inspecting the effective diameter of the screw hole H and measuring the screw depth D, it is not necessary for the operator to manually rotate the screw gauge 8. Therefore, it is possible to reduce fatigue during inspection and measurement work, and further shorten measurement time. Further, since the through screw gauge 8 is screwed with a predetermined torque, an error caused by a difference in torque at the time of screwing is eliminated. Therefore, there is no individual difference in the measurement result depending on the worker who performs the measurement.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention, in which the measuring means for measuring the distance between the gauge driver 1 and the work W is used in the above-mentioned screw measuring device. What is performed by the electric micrometer system is shown. Only the configuration different from that shown in FIG. 1 will be described below.

That is, the bulging portion 15 of the gauge driver 1
The measuring means provided therein includes a spindle 17, a spring 19 for urging the spindle 17 toward the work W, a differential transformer 30 provided at the base end side of the spindle 17, and the differential transformer. An arithmetic unit 31 that processes the output of 30 and an LED 32 as a display unit that displays the processing contents of the arithmetic unit 31.
It is composed of The differential transformer 30 includes a core 33 provided at a base end of the spindle 17 and a core 33.
And a coil group 34 having a primary coil and a secondary coil that surround the
The position of 3 is converted into an electric quantity and output to the arithmetic unit 31.

Further, the arithmetic unit 31 includes a differential transformer 30.
The electric quantity output from the spindle 17 is calculated to detect the position of the spindle 17, and the movement amount of the spindle 17 is calculated from the change in the position detection result.
Further, the LED 32 is configured to display the movement amount calculated by the calculation unit 31, that is, the screw depth D.

In this embodiment having the above construction, when the thread depth D is measured using the gauge driver 1, the motor 11 is rotated and the thread gauge 8 is screwed into the screw hole H. . At this time, the through screw gauge 8
As the through screw gauge 8 rotates, the screw driver 8 is screwed into the depth of the screw hole H, and the gauge driver 1 also moves to the work W side.
Eventually, the tip of the through screw gauge 8 reaches the end of the screw hole H, and the rotation of the through screw gauge 8 is rotated by the torque switch 1.
It stops when 4 operates. Then, the movement of the gauge driver 1 to the work W side is also stopped. At this time,
The screw depth D calculated by the calculation unit 31 is determined by the LED 32
Is displayed, the thread depth D can be directly read. Further, when the measurement of the screw hole H is started, the work of bringing the spindle 17 into contact with the work W and adjusting the adjusting screw in this state becomes unnecessary.

It is to be noted that the calculation section 31 judges whether the calculated screw depth D is within the allowable range of the screw hole H, and the LED 32 displays the judgment result. For example, it is not necessary for the worker to directly read the thread depth D from the LED 32 and then determine whether or not the thread depth D is within the allowable range.

(Third Embodiment) FIG. 4 shows a third embodiment of the present invention. In the screw measuring apparatus of the first embodiment, the distance between the gauge driver 1 and the work W is The measuring means for measuring is shown by a laser length measuring method. Only the configuration different from that shown in FIG. 1 will be described below.

That is, the bulging portion 15 of the gauge driver 1
The measuring means provided therein includes a light emitting means 41 for emitting a laser beam 40 toward the work W and a light receiving means 42 for detecting a light receiving position of the laser light 40 reflected from the work W.
And a control unit 43 as a calculation unit that calculates the distance between the gauge driver 1 and the work W based on the light receiving position information to the light receiving unit 42, and also controls the projection / reception of the laser light 40.
And an LED 32 that displays the calculation result of the control unit 43.

The light emitting means 41 is composed of a laser oscillator 44 composed of a semiconductor laser oscillating device, and a projection lens 45 for converging the laser beam 40 oscillated from the laser oscillator 44 and projecting it onto the work W side. ing. The light receiving means 42 includes a light receiving lens 46 that converges the laser light 40 reflected from the work W, and a position detection element 47 that receives the converged laser light 40. The position detecting element 47 is a semiconductor in which the current flowing changes in correspondence with the light receiving position of the received laser beam 40, and the light receiving position can be grasped by measuring the current value. There is.

Further, the control section 43 calculates the current value to determine the light receiving position of the laser beam 40 reflected from the work W to the position detecting element 47, and the gauge driver 1
And the work W are detected, and the movement amount of the gauge driver 1 to the work W side is calculated from the change in the distance. Further, the LED 32 is
The screw depth D calculated by the calculator 31 is displayed.

In this embodiment having the above construction, when the thread depth D is measured using the gauge driver 1, the motor 11 is rotated to screw the thread gauge 8 into the threaded hole H. . At this time, the through screw gauge 8
As the through screw gauge 8 rotates, the screw driver 8 is screwed into the depth of the screw hole H, and the gauge driver 1 also moves to the work W side.
Eventually, the tip of the through screw gauge 8 reaches the end of the screw hole H, and the rotation of the through screw gauge 8 is rotated by the torque switch 1.
It stops when 4 operates. Then, the movement of the gauge driver 1 to the work W side is also stopped. At this time,
The screw depth D calculated by the control unit 43 is the LED 32
Is displayed, the thread depth D can be directly read. Further, as compared with the first and second embodiments, since the spindle is not used, the spindle does not disturb the measurement. Further, when the gauge driver 1 is stored, it is not necessary to protect the spindle from being bent due to external force applied to the spindle.

The controller 43 determines whether the calculated screw depth D is within the allowable range of the screw hole H, and the LED 32 displays the determination result. For example, it is not necessary for the worker to directly read the thread depth D from the LED 32 and then determine whether or not the thread depth D is within the allowable range.

(Fourth Embodiment) FIG. 5 shows a fourth embodiment of the present invention. In the screw measuring apparatus of the first embodiment, the distance between the gauge driver 1 and the work W is The measuring means for measurement is performed by an ultrasonic length measuring method. Only the configuration different from that shown in FIG. 1 will be described below.

That is, the bulging portion 15 of the gauge driver 1
The measuring means provided inside the ultrasonic wave 5 toward the work W
The wave transmitter 51 as a transmission means for transmitting 0 and the work W
The receiver 52 which is the receiving means for receiving the ultrasonic wave 50 reflected from the ultrasonic wave 50 and the state where the ultrasonic wave 50 is received by the wave receiver 52 are calculated to calculate the distance between the gauge driver 1 and the work W, and A control unit 55 that controls the wave transmitter 51 and the wave receiver 52, and an LED 3 that displays the calculation result of the control unit 55.
2 and.

The control section 55 controls the oscillation of the ultrasonic wave 50 from the wave transmitter 51 to repeat every predetermined time, and the ultrasonic wave 50 is reflected by the work W and received by the wave receiver 52. Until the ultrasonic wave 50
The distance between the gauge driver 1 and the work W is calculated based on the propagation velocity of. Also, the LED 3
2 is configured to display the thread depth D calculated by the control unit 55.

In this embodiment having the above construction, when the thread depth D is measured by using the gauge driver 1, the motor 11 is rotated to screw the thread gauge 8 into the screw hole H. . At this time, the through screw gauge 8
As the through screw gauge 8 rotates, the screw driver 8 is screwed into the depth of the screw hole H, and the gauge driver 1 also moves to the work W side.
Eventually, the tip of the through screw gauge 8 reaches the end of the screw hole H, and the rotation of the through screw gauge 8 is rotated by the torque switch 1.
It stops when 4 operates. Then, the movement of the gauge driver 1 to the work W side is also stopped. At this time,
The screw depth D calculated by the control unit 55 is the LED 32
Is displayed, the thread depth D can be directly read. Further, as compared with the first and second embodiments, since the spindle is not used, the spindle does not disturb the measurement. Further, when the gauge driver 1 is stored, it is not necessary to protect the spindle from bending.

In each of the gauge drivers 1 of the third and fourth embodiments, the distance between the gauge driver 1 and the work W is measured by utilizing the reflection from the work W. It is desirable to use them properly according to the surface condition of the work W.

[0035]

As described above, according to the present invention, when inspecting the effective diameter of the screw hole and measuring the depth, the screw gauge is rotated by the motor as the gauge driver body, so that the operator manually There is no need to rotate the thread gauge. Therefore, fatigue during inspection and measurement work can be reduced, and further, measurement work time can be shortened, and work efficiency is significantly improved. Further, since the error caused by the difference in torque when the through screw gauge is screwed in is eliminated, there is also no individual difference in the measurement result depending on the worker who performs the measurement. Furthermore, when screwing the through screw gauge into the screw hole, the effective diameter of the screw hole can be inspected by checking whether the through screw gauge is screwed into the screw hole. The screw depth can be measured by measuring the distance between the gauge driver body and the work. Therefore, it is possible to provide a screw measuring device capable of simultaneously inspecting the effective diameter of the screw hole and measuring the screw depth.

Also, in the case of the inventions of claims 2 to 5, the same effect as described above can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic view seen from a side surface showing a first embodiment of the present invention.

FIG. 2 is an enlarged side view showing a main part of the embodiment.

FIG. 3 is a schematic view of a second embodiment of the present invention viewed from a side surface.

FIG. 4 is a schematic view seen from a side surface showing a third embodiment of the present invention.

FIG. 5 is a schematic view seen from a side surface showing a fourth embodiment of the present invention.

FIG. 6 is a partial cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 gauge driver (gauge driver main body) 8 way screw gauge 11 motor 17 spindle 23 scale 25 pointer 30 differential transformer 31 arithmetic unit (calculating means) 32 LED (display means) 40 laser light 41 light emitting means 42 light receiving means 43 control section (Calculation means) 50 Ultrasonic wave 51 Wave transmitter (transmission means) 52 Wave receiver (reception means) 55 Control unit (calculation means) D Screw depth H Screw hole W Work

Claims (5)

[Claims] 1. A gauge driver main body comprising a through-thread gauge screwed into a screw hole opened in a work and a motor for rotating the through-thread gauge with a predetermined torque,
When the screw gauge is screwed into the screw hole as described above,
A screw measuring device comprising a measuring means for measuring a distance between the gauge driver main body and the work. 2. A spindle which is urged to the work side and is interlocked with the spindle, wherein the measuring means has a probe contacting the work, is slidable in the extending direction of the thread gauge. 2. The screw measuring device according to claim 1, further comprising: a pointer provided on the gauge driver main body, the pointer indicating a position of the spindle, and a scale provided on the gauge driver main body. 3. A spindle having a probe contacting the work, the measurement means being slidable in the extending direction of the thread gauge and biased toward the work, and a position of the spindle. To a quantity of electricity, and a calculation for calculating the distance between the gauge driver body and the work after determining the position of the spindle from the quantity of electricity converted by the differential transformer. The screw measuring device according to claim 1, wherein the screw measuring device comprises: a means and a display means for displaying a calculation result of the calculating means. 4. The measuring means includes: a light emitting means for emitting a laser beam toward the work; a light receiving means for receiving a laser beam reflected from the work and detecting a light receiving position of the laser beam; 7. A calculation means for calculating a distance between the gauge driver main body and the work from the light receiving position detected by the means, and a display means for displaying a calculation result of the calculation means. 1. The screw measuring device according to 1. 5. The measuring means, a transmitting means for transmitting an ultrasonic wave toward the work, a receiving means for receiving an ultrasonic wave reflected from the work, and the ultrasonic wave transmitted from the transmitting means. A calculation unit that measures the time until it is received by the reception unit and calculates the distance between the gauge driver main body and the workpiece from this time and the propagation velocity of the ultrasonic wave, and displays the calculation result of the calculation unit. The screw measuring device according to claim 1, further comprising a display means.