JPS6363045B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a displacement measuring device, and in particular, has a measuring head slidably supported on a main frame, suitable for use in micrometers, linear gauges, limit gauges, etc. The present invention relates to an improvement in a displacement measuring device that measures the length of an object to be measured based on the amount of displacement of the probe when the tip of the probe is brought into contact with the object.

It has a measuring head that is slidably supported on the main frame, and the length of the object to be measured can be measured from the amount of displacement of the measuring head when the tip of the measuring head comes into contact with the object to be measured. 2. Description of the Related Art Micrometers or linear gauges are known, as are limit gauges that detect whether the dimensions of an object to be measured are within an allowable range, for example, a tolerance, based on the amount of displacement of a measuring point.

In such a displacement measuring device, in order to accurately measure the displacement, a pressurizing means is usually required to bring the tip of the probe into contact with the object to be measured with a constant measuring force.

In addition, in order to facilitate repeated measurements of objects of the same size, it is necessary to quickly detect the measured value when the probe contacts the object with a constant measuring force, and to It is necessary to be able to quickly retreat by a predetermined amount from the contact state and then move forward.

Furthermore, in case the object to be measured changes,
A feeding mechanism to drastically change the measurement range,
For example, when used as a limit gauge, there is a need for a locking mechanism that can fix the probe in any desired position.

However, the pressurizing means in conventional displacement measuring devices consists of, for example, a spring that biases the probe in one direction, and the amount of deformation of this spring varies depending on the amount of movement of the probe, so a uniform measurement force is required. The problem was that it was not possible to obtain

Furthermore, conventionally, there has been no displacement measuring device that has both a function that allows the probe to move forward and backward quickly within a predetermined range from the state in which it is in contact with the object to be measured, and a feeding mechanism that allows the probe to move forward and backward by a large amount.

Therefore, in conventional displacement measuring devices, for example, when using a screw-feed probe, it is convenient to move the probe back and forth within a small range during repeated measurements and to obtain a predetermined measuring force. However, if the measurement range changes significantly due to changing the object to be measured, there is a problem in that the probe cannot be moved quickly, and the probe cannot be moved linearly using a lever, etc. In the case of a structure that allows large movements, there are problems in that it is difficult to make repeated measurements by slightly moving the probe, and it is also difficult to obtain a constant measuring force regardless of the measurement range.

This invention was made in view of the above-mentioned conventional problems, and it is possible to move the measuring point quickly and greatly, and when it comes into contact with the object to be measured, it can be moved slightly, and it can be constantly moved. It is an object of the present invention to provide a displacement measuring device that can bring a measuring element into contact with an object to be measured with a constant measuring force.

This invention has a gauge head that is slidably supported on a main frame, and the length of the target object can be determined based on the amount of displacement of the gauge head when the tip of the gauge head comes into contact with the target object. The displacement measuring device is configured to include a support that is arranged parallel to the moving direction of the probe and has a threaded portion formed in at least a portion of the axial direction, and a support that rotates and axially extends. a claw portion that is slidably fitted and engaged with the male threaded portion of the support column so as to be freely engageable and detachable and movable along the thread of the male threaded portion;
A driven sleeve that is engaged in the axial direction with respect to the measuring element, and a sliding clutch that is fitted into the driven sleeve and that can transmit only a torque of a certain value or less to the driven sleeve in the rotational direction. a drive sleeve that is connected to the drive sleeve and is arranged so as to be operable from the outside in the axial and rotational directions; and the drive sleeve is arranged at a position facing the claw portion of the drive sleeve, and the claw portion is engaged with and disengaged from the male threaded portion of the column. The above object is achieved by providing a locking/disengaging mechanism.

Further, the present invention provides the displacement measuring device,
The above object is achieved by setting the pressure angle of the male thread portion to 10 to 15 degrees.

Further, the present invention provides the displacement measuring device,
The engagement and disengagement mechanism is arranged so that the drive sleeve can be slightly moved relative to the driven sleeve in the axial direction, and after the driven sleeve reaches the end of its stroke, the drive sleeve is configured to move relative to the driven sleeve in the same direction. Therefore, the above object is achieved by configuring the claw portion to engage with the male thread portion.

Further, the present invention provides the displacement measuring device,
The claw portion is swingably disposed in a radial gap between the driven sleeve and the drive sleeve, and the engaging/disengaging mechanism is disposed inside the drive sleeve, and the claw portion is arranged in a radial gap between the driven sleeve and the driven sleeve. The above object is achieved by using a spring member that presses to change the angle depending on the relative position.

Embodiments of the present invention will be described below with reference to the drawings.

This embodiment has a spindle 2, which is a measuring element, which is slidably supported on a main frame 1, and the amount of displacement of the spindle 2 when the tip of the spindle 2 is brought into contact with the object to be measured is determined by the amount of displacement of the object to be measured. In a micrometer M which is a displacement measuring device designed to measure the length of an object, a support 3 is arranged parallel to the moving direction of the spindle 2 and has a threaded portion 3A formed in a part of the shaft in the axial direction. It is rotatably and axially slidably fitted into this column 3, and is engaged with the male threaded portion 3A of the column 3 so as to be freely engageable and detachable and movable along the thread of the male threaded portion 3A. a driven sleeve 5 which is provided with a claw portion 4 and is engaged with the spindle 2 in the axial direction;
In the rotational direction, the clutch is connected via a slip clutch 6 that can only transmit torque below a certain value.
A drive sleeve 7 is disposed so as to be operable from the outside in the axial and rotational directions, and the drive sleeve 7 is disposed at a position facing the claw portion 4 and engages the claw portion 4 with the male threaded portion 3A of the support column 3. A locking/disengaging mechanism 8 is provided.

The claw portion 4 is disposed in a radial gap between the driven sleeve 5 and the drive sleeve 7 so as to be swingable in the radial direction toward the driven sleeve 5 by a shaft 9, and is formed at one tip thereof. Threaded part 4A
is shaped so that it can be engaged with the thread groove of the male threaded portion 3A of the support.

Further, the engaging/disengaging mechanism 8 is arranged so that the driving sleeve 7 can be moved slightly relative to the driven sleeve 5 within a range indicated by the reference numeral S in the figure, and the driven sleeve 5 shown in FIG. In FIG. 2, after the end of the stroke in the left direction, the threaded portion 4A of the claw portion 4 engages with the thread groove of the male threaded portion 3A due to the relative movement of the drive sleeve 7 in the same direction. It is configured to include a member 10.

That is, as shown in FIG. 2, the spring member 10 is a ring-shaped spring disposed within an inner circumferential groove 11 formed on the inner circumference of the drive sleeve 7 at an axial midpoint. When the spring member 10 contacts the outside of the claw portion 4 and the driving sleeve 7 moves relative to the driven sleeve 5 and the claw portion 4 integral therewith, the shaft 9 of the claw portion 4 When the spring member 10 is on the left side of the shaft 9 in FIG. 4A from the male threaded portion 3A.

The sliding clutch 6 is disposed in a radial gap between the driven sleeve 5 and the driving sleeve 7, and the left end side in the figure is attached to the right end surface of the stepped portion 5A of the driven sleeve 5, and the other end is a free end. , the outer periphery of which is constituted by a coil spring that is brought into frictional contact with the inner peripheral surface of the drive sleeve 7.

In the drawing, the left end of the driven sleeve 5 is connected to the spindle 2 via a connecting fitting 12 that slidably straddles the support 3 so as to be able to move integrally with the spindle 2 (Figs. 3 and 3). (See Figure 2).

The connecting fitting 12 has a main scale 1 which is long in parallel with the spindle 2 and the driven sleeve 5 and has light transmitting parts and non-light transmitting parts formed alternately.
3 is supported so as to be able to reciprocate integrally with the spindle 2.

Reference numeral 14 in this figure indicates a light source 15 for detecting the amount of displacement of the spindle 2 from the displacement of the main scale 13 accompanying the movement of the spindle 2, and a light transmitting part and a non-transmitting part similar to the main scale 13. index scales 16 formed alternately;
and a photoelectric displacement detection device including a light receiving element 17 that receives light from the light source 15 that has passed through the main scale 13 and the index scale 16.

The output of this photoelectric displacement detection device 14 is input to a digital display section 18, and the amount of displacement of the spindle 2 from the reference position is digitally displayed.

Reference numeral 19 in the figure is a battery housed in the hollow part within the support column 3, 20 is a wiring for supplying power from the battery 19 to the light source 15 and the digital display section 18, and 21 is connected to the tip of the spindle 2. Anvils placed opposite to each other at the inner ends of the main frame 1; 22 a buffer member with which the right end of the driven sleeve 5 comes into contact when the driving sleeve 7 is moved to the right end position in the figure; 23 a hollow part of the support column 3; The caps of each section are shown below.

A male threaded portion 3A formed on the outer periphery of the pillar 3
is a spiral groove with a pressure angle of 10 to 15 degrees,
This prevents the female screw threaded therewith, that is, the threaded portion 4A of the pawl portion 4 from biting in or from natural relative rotation or loosening without external force being applied.

Next, the operation of the above embodiment will be explained.

When the spindle 2 is to be moved significantly, when the drive sleeve 7 is moved relative to the driven sleeve 5 in the right direction in the figure, the spring member 10 disposed inside the drive sleeve 7 springs against the shaft 9 of the claw portion 4. As the outer side moves to the right, the threaded portion 4A separates from the male threaded portion 3A of the column 3 (see Fig. 4).
The driven sleeve 5 is made freely movable in the axial direction with respect to the column 3.

If the driving sleeve 7 is moved in this state, the driving sleeve 7 and the driven sleeve 5 can be quickly moved together.

When measuring the length of an object to be measured with a constant measuring force by inserting the object between the tip of the spindle 2 and the anvil 21, first remove the drive sleeve 7 from the state shown in Fig. 4. , move it to the left in the figure.

When the drive sleeve 7 is moved to the left, the spindle 2 that is integrally interlocked with the drive sleeve 7 also protrudes to the left, and its tip abuts the object to be measured.

When the spindle 2 comes into contact with the object to be measured, this is the end of the stroke, and the driven sleeve 5 can no longer move to the left either.

If the driving sleeve 7 is further pushed to the left in this state, the driving sleeve 7 can move relative to the driven sleeve 5 within the range indicated by the symbol S in the figure, so the driving sleeve 7 will move further to the left within this range. do.

At this time, the spring member 10
The claw portion 4 moves to the left in the figure.
is pressed in a direction such that its threaded portion 4A engages with the male threaded portion 3A, thereby fixing the claw portion 4 in the state shown in FIG.

When the drive sleeve 7 is rotated with the claw portion 4 engaged with the male threaded portion 3A, the threaded portion 4 of the claw portion 4
Since A is screwed along the thread groove of the male threaded portion 3A, the driven sleeve 5 and the driving sleeve 7 are screwed together along the male threaded portion 3A.

The rotational torque transmitted from the driving sleeve 7 to the driven sleeve 5 during this spiral movement is transmitted via the sliding clutch 6 made of a coil spring, so that the tip of the spindle 2 can be applied to the object to be measured with a constant measuring force. pressed, i.e. driven sleeve 5
When the resistance in the rotational direction of the spindle 2 exceeds a certain value, the driving sleeve 7 is rotated idly relative to the driven sleeve 5, thereby maintaining the measuring force of the spindle 2 at a constant value.

When repeatedly measuring in this state, the drive sleeve 7 is rotated in the opposite direction to slightly retract the spindle 2, and then the drive sleeve 7 is rotated in the protruding direction of the spindle 2 in the same manner as described above to perform fine movement. Perform repeated measurements.

In addition, when using the micrometer M as a limit gauge, in the same way as above, at a predetermined position,
When the threaded portion 4A of the claw portion 4 is engaged with the male threaded portion 3A, the pressure angle of the male threaded portion 3A becomes 10 as described above.
~15°, so the driven sleeve 5 is
It does not naturally loosen with respect to A and is securely locked in this position, so it can be used as a limit gauge with simple operation without using any other locking means such as a clamp.

In addition, in the above embodiment, the threaded portion 4A of the claw portion 4 is
Although the spindle 2 is configured to engage with the male threaded portion 3A only when the stroke end is in the left direction in the figure, the present invention is such that the claw portion engages with the male thread portion 3A only when the spindle 2 reaches the stroke end in the right direction in the figure or in both directions. This also includes the case where 4 engages with the male threaded portion 3A.

If the claw portion 4 is to be engaged with the male thread portion 3A even when reaching the stroke end in the right direction in the figure, the claw portion may be arranged in the opposite direction to the claw portion 4, or
It is preferable to provide another threaded portion on the opposite side of the threaded portion 4A of the claw portion 4. In this way, it is also possible to measure the inner diameter or groove width.

Further, in the above embodiments, the present invention is applied to an electric micrometer equipped with a digital display section, but the present invention is not limited to this. Electric limit gauge, mechanical micrometer,
This also applies to the following. However, when used in an electric displacement measuring device, the pitch of the spiral groove of the male threaded portion 3A does not affect measurement accuracy, so there is an advantage that manufacturing is easy.

In the above embodiment, the rotational torque is transmitted between the driving sleeve and the driven sleeve using a coiled spring-like sliding clutch. The present invention is not limited to the configuration of the embodiment, as long as it is a slipping clutch that causes slippage in the rotational direction between the clutches.

Therefore, for example, a moderation ball mechanism, a friction member, etc. may be used.

Further, the engagement/disengagement operation of the claw portion 4 with respect to the male thread portion 3A is performed such that the claw portion 4 engages with the male thread portion 3A during a fine movement operation of the spindle 2, and disengages during a large stroke movement. It is not limited to the configuration of the embodiment as long as the engaging/disengaging mechanism is activated.

Since the present invention is configured as described above, it is possible to accurately and quickly adjust the gauge head to any reference position while making the entire stroke of the gauge head effective with a simple structure. It has the excellent effect that fine movement operations can be performed accurately and quickly, and that the measuring force can always be kept constant regardless of the position of the probe.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of a displacement measuring device according to the present invention, FIG. 2 is a front sectional view of the same embodiment, and FIG. 3 is an enlarged sectional view taken along the - line in FIG. 2. FIG. 4 is an enlarged cross-sectional view showing a main part to show the operation of the same embodiment. M...Micrometer, 1...Main frame, 2...Spindle, 3...Strut, 3A...Male thread part, 4...Claw part, 4A...Thread part, 5...
Driven sleeve, 6... Sliding clutch, 7... Drive sleeve, 8... Engagement/disengagement mechanism, 10... Spring member,
13...Main scale.

Claims (1)

[Scope of Claims] 1. A measuring element that is slidably supported on a main frame, and the amount of displacement of the measuring element when the tip of the measuring element is brought into contact with the object to be measured, can be used to determine the object to be measured. In a displacement measuring device configured to measure length, etc., the probe is arranged parallel to the moving direction of the probe, and
A column having a threaded portion formed in at least a portion of the column in the axial direction; a driven sleeve that is provided with a claw that is engaged so as to be movable along the thread and that is engaged in the axial direction with respect to the gauge head; On the other hand, there is a drive sleeve that is connected via a sliding clutch that can transmit only a torque below a certain value in the rotational direction and is arranged so as to be operable from the outside in the axial and rotational directions, and the claw portion of the drive sleeve. 1. A displacement measuring device comprising: an engagement/disengagement mechanism disposed at a facing position for engaging and disengaging the claw portion from the male threaded portion of the support column. 2. The displacement measuring device according to claim 1, wherein the pressure angle of the male threaded portion is 10 to 15 degrees. 3. The engaging/disengaging mechanism is arranged such that the driving sleeve can be moved slightly relative to the driven sleeve in the axial direction, and after the driven sleeve reaches the end of its stroke, the driving sleeve is moved relative to the driven sleeve in the same direction. The displacement measuring device according to claim 2 or 3, characterized in that the claw portion is configured to engage with the male thread portion by means of the following. 4. The claw portion is swingably disposed in a radial gap between the driven sleeve and the drive sleeve, the engaging/disengaging mechanism is disposed inside the drive sleeve, and the claw portion is arranged in a radial gap between the driven sleeve and the driven sleeve. 4. The displacement measuring device according to claim 3, further comprising a spring member that presses to change the angle depending on the relative position of the displacement measuring device.