JPH07311004A - Thread measuring device - Google Patents

Abstract

PURPOSE:To provide the thread measuring device in which operating efficiency is excellent at the time of measurement, no limitation is imposed on application objects, and the inspection of an effective diameter of a thread hole and the measurement of thread depth can be simultaneously performed. CONSTITUTION:A gauge driver 1 is provided with a through thread gauge 8, a motor 11 rotating normally/reversely the aforesaid gauge, and with a manual switch 3 controlling the aforesaid rotation. When the through thread gauge 8 is screwed in the thread hole H of a work W, the number of rotation of the through thread gauge 8 is detected by a rotary encoder 15, the quantity of screwing-in of the through thread gauge 8 is operated by a control section 18 based on the detected number of rotation and a thread pitch set in advance, and its result is thereby indicated by a LED 5.

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. 8 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.

On the other hand, as described above, the screw measuring device is
Since the structure is such that the screw depth is measured by the amount of retreat of the holder 83 that covers the periphery of the through screw gauge 82, for example, FIG.
As shown in (a) and (b) of the above, when the surface of the work W is inclined with respect to the screw hole H, or when there is a protruding portion near the opening edge of the screw hole H, measurement is performed. An error ΔX occurs in the depth D to be removed. Therefore, there is also a problem that the screw depth cannot be measured depending on the work.

[0006] The present invention has been made in view of such conventional problems, and the work efficiency at the time of measurement is good, and the object of use is not limited, and the inspection of the effective diameter of the screw hole and the screw depth are performed. An object of the present invention is to provide a screw measuring device capable of simultaneously measuring height.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, in the present invention, a through screw gauge screwed into a screw hole, and a motor for rotating the through screw gauge with a predetermined torque are provided. By the rotation speed detection means for detecting the rotation speed of the above-mentioned thread gauge, the pitch setting means for setting the thread pitch of the above-mentioned thread gauge, and the rotation speed detection means while the above-mentioned thread gauge stops after rotating. Calculation means for calculating the screw-in amount of the thread gauge based on the detected rotation speed and the screw pitch set by the pitch setting means, and a display for displaying information based on the calculation result of the calculation means as a measurement result. And means.

[0008]

In the above structure, the motor is rotated while the through screw gauge is pressed against the opening of the screw hole that opens in the work. At this time, the screw gauge is rotated with a predetermined torque, and if the effective diameter of the screw hole is within the tolerance, it is screwed into the screw hole. Further, if the effective diameter is smaller than a predetermined diameter and a torque equal to or larger than the predetermined torque is applied to the thread gauge, the thread gauge will not be screwed. Thereby, the effective diameter of the screw hole can be inspected.

Further, at this time, the rotational speed of the threaded thread gauge during the time from the start of rotation of the threaded thread gauge by the rotational speed detection means to the stop thereof, that is, during the operation of screwing the threaded thread gauge into the screw hole is performed. Based on the detected rotation speed and the screw pitch set by the pitch setting means, the screwing amount of the threaded thread gauge is calculated by the calculating means, and the information based on the calculation result is displayed on the display means as the measurement result. Is displayed. Thereby, the screw depth can be measured. The measurement result includes not only the numerical value indicating the calculation result but also a display indicating whether or not the calculation result falls within a predetermined allowable range.

In this way, if the through screw gauge can be screwed into the screw hole, for example, when the surface of the work is inclined with respect to the screw hole or there is a protruding portion near the opening edge of the screw hole. However, the screw depth can be measured without any trouble.

Therefore, an operator can inspect the effective diameter and measure the screw depth without manually rotating the thread gauge. Moreover, since the through-thread gauge is screwed with a predetermined torque, an error due to a difference in torque at the time of screwing is eliminated from the inspection result and the measurement result.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 2, the screw measuring device according to the present invention includes a gauge driver 1 and a control unit 2 to which the gauge driver 1 is connected. 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. A display unit 4 is provided on the opposite side of the manual switch 3, and as shown in FIG. 3, the display unit 4 is provided with an LED 5 which is a display means and can display a three-digit numerical value.
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 provided with an adapter 9
It is detachably attached via.

As shown in FIG. 1, inside the gauge driver 1, a motor 11, a gear 12 for transmitting the rotational force of the motor 11 to the screw gauge 8 and a torque limiter 13 are housed. The torque limiter 13 idles when a torque larger than a predetermined value is applied, and cuts off the transmission of rotation to the screw gauge 8 side. Further, inside the gauge driver 1, a torque switch 1 that mechanically operates to stop the motor 11 as the torque limiter 13 idles.
4 and a torque limiter 13 connected to the adapter 9.
As described above, the rotary encoder 15 is provided on the output shaft (not shown) on the side of the screw gauge 8 and is a rotation speed detecting means for detecting the rotation speed.

On the other hand, the control unit 2 includes a power source unit 17
, The control unit 18, and the pitch setting unit 19 connected to the control unit 18.
And the power supply unit 17 has the torque switch 1
The electric power is supplied to the motor 11 via 4 and the manual switch 3. Pitch setting section 19
Is a pitch setting means for transmitting the screw pitch of the screw gauge 8 to the control unit 18, and the screw pitch to be transmitted can be changed by the knob 10 for pitch setting provided on the operation panel of the control unit 2. Has become. Further, the control unit 18 includes the above-mentioned manual switch 3 and LED.
5 and the rotary encoder 15 are respectively connected. The control unit 18 includes a CPU and operates based on a preset program, and the control unit 18 realizes an arithmetic unit.

In the present embodiment having the above-mentioned structure, the manual switch 3 is operated to the forward rotation position while the through screw gauge 8 is pressed against the opening of the screw hole H which is opened in the work W (see FIG. 1). Then, the motor 11 is rotated and the screw gauge 8 is rotated. At this time, since the thread gauge 8 is rotated via the torque limiter 13, it is always rotated with a predetermined torque. Therefore, 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 through screw gauge 8
Since the torque more than the torque determined by the above is applied and the torque limiter 13 idles, the through screw gauge 8 is not screwed. Thereby, the effective diameter of the screw hole H can be inspected.

When the screwing is completed, the torque limiter 13 idles to stop the thread gauge 8 from rotating, and at the same time, the torque switch 14 causes the motor 11 to rotate.
Is stopped. Then, in such a state, the manual switch 3
The motor 11 is rotated in the reverse direction when is operated to the reverse rotation position, and the threaded screw gauge 8 can be pulled out from the screw hole H.

On the other hand, in the above-mentioned work, when the manual switch 3 is operated to the forward rotation position, the rotary encoder 15 starts detecting the number of rotations of the thread screw gauge 8, and at the same time when the thread screw gauge 8 is screwed, The control unit 18 calculates the screwing amount of the through screw gauge 8 based on the detected rotation speed and the preset screw pitch, and the information based on the calculation result is the measurement result, that is, 3
The numerical value of the digit is displayed on the LED 5 of the display unit 4 every moment.
This enables the screw depth to be measured at the same time as the above-described inspection of the effective diameter. This display is reset at the start of the next forward rotation after the reverse rotation.

As described above, according to the screw measuring apparatus of the present embodiment, the operator does not need to manually rotate the screw gauge 8 to rotate, and therefore the inspection and measurement work efficiency is good. Moreover, since the measurement of the screw depth is based on the screwing amount of the through screw gauge 8 into the screw hole H, if the through screw gauge 8 can be screwed into the screw hole H, for example, the workpiece W can be inserted into the screw hole H. The screw depth can be measured without any problem even if the surface of the screw is inclined or there is a protruding portion near the opening edge of the screw hole H. Therefore, the object to be used is not limited to that shown in the conventional example. In addition to this, since the torque at the time of screwing the through screw gauge 8 is constant, the error resulting from the difference in the torque at the time of screwing is eliminated from the inspection result and the measurement result. Therefore, the inspection accuracy and the measurement accuracy can be improved.

In the present embodiment, the measurement result of the screw depth is displayed as a three-digit numerical value. However, for example, it is simply determined whether or not the calculation result is within a predetermined allowable range. May be displayed.

FIG. 4 shows an embodiment according to the invention of claim 4, and the above-mentioned screw measuring device can have the following structure. Only the configuration different from that shown in FIG. 1 will be described below (the rotary encoder 15 is omitted in this figure).

That is, the gauge driver 1 has a movable shaft 23, one end of which is externally fitted to the output shaft 22 of the torque limiter 13 while being axially movable and restricted in rotation. The movable shaft 23 is rotatably and axially movably supported by a pair of spaced-apart sleeves 24, 24 fixed to the housing 21 of the gauge driver 1, and extends from the housing 21 at the other end side. The adapter 9 described above is provided. In addition, the movable shaft 23
Has a large diameter portion 23a at one end side and a small diameter portion 23b having a smaller diameter at the other end side.
A step portion 23c is formed at a portion located between 24.

A movable plate 25 is provided on the small diameter portion 23b of the movable shaft 23.
Is loosely fitted. The movable plate 25 is movable in the axial direction of the small diameter portion 23b in the housing 21, and is restricted from rotating. The movable plate 25 is movable by the step portion 23c and the stopper 26 provided on the small diameter portion 23b.
The movement in the axial direction with respect to 3 is restricted. Further, the movable plate 25 includes a large diameter portion 23a side and a small diameter portion 23 of the movable plate 25.
It is pinched by springs 28, 28 that are externally inserted on the b side. As a result, the movable shaft 23 is positioned at a predetermined position (the position shown in FIG. 4) in the housing 21 by the balance of the spring forces of both springs 28, 28 when not in use in which no axial force is applied. It has become. That is, the movable shaft 23 moves to one side in the axial direction (arrow A) by the pressing force when screwing the through screw gauge 8 into the screw hole H, and moves to the other side by the pulling force when pulling out the through screw gauge 8. It is designed to move to (arrow B).

Further, in the housing 21, a micro switch 29 is provided on the torque limiter 13 side of the movable plate 25.
Is provided. The micro switch 29 is a change-over switch for rotating the motor 11 in the forward direction or the reverse direction by switching the polarity of the electricity supplied to the motor 11.
It has a button 30 that operates in three states: a forward rotation state in which the forward rotation is performed and a reverse rotation state in which the reverse rotation is performed. The button 30 is constantly pressed by the movable plate 25 and is in a stopped state when it is not used, that is, when the movable shaft 23 is at a predetermined position, and when the movable shaft 23 moves to one side (arrow B), the button 30 is positive. When the movable shaft 23 moves to the other side (arrow B), it is operated in the reverse state. That is, the movable shaft 23, the movable plate 25, the springs 28, 28,
The microswitch 29 constitutes the rotation direction switching means of the present invention, which operates by mechanically sensing the force applied to the thread gauge 8 in the axial direction. In this embodiment, the manual switch 3 described above is omitted.

In this embodiment having such a structure, when the screw measuring device is not used, no operating force is applied to the movable shaft 23, so that the motor 11 is stopped. On the other hand, when the gauge driver 1, that is, the through screw gauge 8 is pressed against the work W when the screw measuring device is used, the motor 11 automatically rotates in the normal direction, and the through screw gauge 8 is screwed into the screw hole H,
Further, if the gauge driver 1 is lifted in that state, the motor 11 automatically reverses and the screw gauge 8 can be pulled out. Therefore, the operator can inspect the effective diameter of the screw hole H and measure the depth without further operating the switch, and as a result, it is possible to further improve the work efficiency of the inspection and measurement. .

In this embodiment, the micro switch 29 is operated not only in the normal rotation state and the reverse rotation state but also in the three stop states in which the motor 11 is stopped when the screw measuring device is not used. However, not limited to this, the micro switch 29 may be operated only in the forward rotation state and the reverse rotation state, and a switch for turning on / off the rotation of the motor 11 may be separately provided. Even in this case,
The same effect as described above can be obtained. In addition, in the present embodiment, the rotation direction switching manual of the present invention operates by the movement of the movable shaft 23 in the axial direction.
Similarly to the above, the one that moves in the axial direction of the screw gauge 8 at the time of work may be provided around the housing 21 of the gauge driver 1 and at a portion gripped by an operator.

Further, the rotation direction switching manual of the present invention is not limited to one that operates by mechanically sensing the force applied in the axial direction of the threaded thread gauge 8, but that operates by sensing the force electrically. It doesn't matter. For example, the one that operates by detecting the axial displacement of the movable shaft 23 by an optical switch or the like, or the force applied to one side in the axial direction of the screw gauge 8 and the force applied to the other side of the screw gauge 8 during work are Movable plate 2
It may be configured to detect and operate with two pressure-sensitive sensors provided at 5 and the like.

On the other hand, although the adapter 9 shown in FIG. 2 is completely solid, it preferably has the following structure. That is, FIG. 5 shows an embodiment according to the invention of claims 2 and 3, and an adapter 31 of this embodiment is shown.
Is the original shaft part 32 connected to the torque mitter 13 side.
And the driven shaft portion 33 to which the screw gauge 8 is attached as described above, and constitutes the manual rotation portion of the present invention. The slave shaft portion 33 is an operating portion that is integrally formed with the mounting shaft 34 to which the screw gauge 8 is detachably mounted as described above and that has a substantially cylindrical shape with a diameter larger than that of the mounting shaft 34 and that has a knurled outer periphery. 35a. A taper hole 36 into which the taper shaft 6 of the thread gauge 8 is inserted is opened in the mounting shaft 34, and a rotary plate 37 provided in the original shaft part 32 is rotatably housed inside the operation part 35a. Has been done.

A wave washer 38 is interposed between the operating portion 35a and the rotary plate 37, and the original shaft portion 32 and the slave shaft portion 33 transmit the rotational force by frictional force, and When the shaft portion 32 is not rotating, it is possible to relatively rotate the large-diameter operating portion 35b and the operating portion 35a of the driven shaft portion 33 by manual operation. In addition, the slave shaft portion 33
Is set so that the torque limiter 13 idles with a torque greater than the torque with which the torque limiter 13 idles.

In this embodiment having such a structure,
Since the shaft portion 33 can be rotated when the original shaft portion 32 is not rotating, that is, when the motor 11 is not operating, when the thread gauge 8 is screwed into the screw hole H of the workpiece W, It is possible to manually rotate the threaded thread gauge 8 to adjust the phases of the thread ridges on both the male thread portion 7 side and the threaded hole H side. Therefore, when measuring the depth of the screw hole H, it is possible to eliminate an error of up to 1 pitch, which occurs when the phases of both thread ridges are deviated at the time of starting the screwing of the threaded thread gauge 8.
Therefore, the measurement accuracy is improved.

In the adapter 31 shown in FIG. 5, the wave washer 38 is used to generate a frictional force between the original shaft portion 32 and the driven shaft portion 33. However, as shown in FIG. A plurality of concave portions 37 a are provided on the peripheral surface of the rotary plate 37 of 32, and the rotary plate 37 and the operating portion 35 of the driven shaft part 33.
A ball 40, which is pressed by the spring 39 to the concave portions 37a, may be provided between and, and a structure may be adopted in which a frictional force is generated between the original shaft portion 32 and the driven shaft portion 33. In this case, the rotation amount of the driven shaft portion 33 can be adjusted intermittently during the adjustment work described above. Separately from this, as shown in FIG. 7, an adjusting screw 41 is provided on the operation portion 35, and after the adjusting work, the tip end thereof is pressed around the rotating plate 37 so that the original shaft portion 32 and the slave shaft portion 33 are separated from each other. You may make it a connection state.

In this embodiment, the adapter 31 is composed of the original shaft portion 32 and the driven shaft portion 33 to serve as the manual rotating portion of the present invention. However, the present invention is not limited to this, and is the same as the adapter 31. In addition, a manual rotating part having an original shaft part and a slave shaft part may be separately provided on the motor 11 side of the thread gauge 8.

[0032]

As described above, according to the present invention, when the effective diameter of the screw hole is inspected and the depth is measured, it is not necessary for the operator to manually rotate the screw gauge. The work efficiency of inspection and measurement is good. Moreover, since the measurement of the screw depth is made based on the screwing amount of the through screw gauge, the surface of the workpiece is inclined with respect to the screw hole, or the portion protruding near the opening edge of the screw hole is Even if there is a problem, the screw depth can be measured without any problem.

Therefore, it is possible to provide a screw measuring device which has good working efficiency and can simultaneously inspect the effective diameter of the screw hole and measure the screw depth without limiting the use object. In addition to this, since the error resulting from the difference in torque at the time of screwing is eliminated from the inspection result and the measurement result, the inspection accuracy and the measurement accuracy can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an external view in which a part of the embodiment is disassembled.

3 is a view on arrow A in FIG. 2. FIG.

FIG. 4 is a cross-sectional view of a main part of a gauge driver that omits a rotary encoder according to another embodiment of the present invention.

FIG. 5 is an enlarged sectional view of an adapter showing another embodiment of the present invention.

FIG. 6 is a sectional view of an adapter showing another embodiment of the present invention.

FIG. 7 is a sectional view of an adapter showing another embodiment of the present invention.

FIG. 8 is a partial cross-sectional view showing a conventional example.

FIG. 9 is an explanatory diagram showing a measurement error in a conventional example.

[Explanation of symbols]

 5 LED (display means) 8 way screw gauge 9 adapter 18 control section (calculation means) 19 pitch setting section (pitch setting means) 23 movable shaft (rotation direction switching means) 25 movable plate (rotation direction switching means) 29 micro switch ( Rotation direction switching means) 31 Adapter (manual rotation part) 32 Original shaft part 33 Slave shaft part

Claims (4)

[Claims] 1. A through-thread gauge to be screwed into a screw hole, a motor for rotating the through-thread gauge with a predetermined torque, a rotation speed detecting means for detecting the number of rotations of the through-thread gauge, and the through-thread gauge. Pitch setting means for setting the screw pitch of the, and the number of revolutions detected by the number of revolutions detecting means while the screw gauge rotates after stopping as described above, and based on the screw pitch set by the pitch setting means, As described above, the screw measuring device comprising: a calculating unit that calculates the screwing amount of the screw gauge; and a display unit that displays information based on the calculation result of the calculating unit as a measurement result. 2. A shaft part rotated by the motor,
A manual rotation unit is provided, which rotates the above-mentioned screw gauge, and has a driven shaft unit that is allowed to rotate in the screwing direction of the above-mentioned screw gauge with respect to the original shaft unit when the motor is not operating. The screw measuring device according to claim 1. 3. The screw measuring device according to claim 1, wherein the manual rotation unit is an adapter for mounting the thread gauge as described above. 4. A force applied to the through thread gauge on one side in the axial direction at the time of a screwing operation into the screw hole is sensed, the motor is operated in a normal rotation state in which the motor is normally rotated, and is applied to the through thread gauge. Detecting the force on the other side in the axial direction,
4. A rotation direction switching means for operating the motor in a reverse rotation state to reverse the rotation is provided.
The described screw measuring device.