JP3341027B2 - Displacement sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential transformer type displacement sensor for converting a mechanical displacement into an electric quantity for measurement.

[0002]

2. Description of the Related Art A conventional displacement sensor of this type includes a cylindrical case 60 as shown in FIG. 6, and a bearing portion (a bush or a linear ball bearing) 61 is provided at the front end of the case 60. In the case 60, a bobbin 63 on which a coil 62 is wound and mounted is housed by being bonded (fixed) with an adhesive (or another member such as a press-fit or a screw). The bearing 61 of the case 60
A measuring element 64 is slidably provided, and a core 65 connected to the measuring element 64 is inserted into an inner hole 63A of the bobbin 63, and the measurement force is applied by a movable spring 66. The child 64 projects forward, and the core 65 is set at an initial position.

In the displacement sensor described above, in order to manually retract (raise) the probe 64, the probe 64 is attached to a separate handle 6 as shown in FIG.
7, the probe 67 is lifted up with a finger 68 to manually retract (raise) the tracing stylus 64.

[0004]

However, as described above, in order to manually retract (raise) the probe 64, a handle 67, which is an external member, is attached to the probe 64, and measurement is performed manually. There is a problem that the portion is invisible and difficult to confirm, and a sudden vertical movement causes a displacement of the displacement sensor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to operate an operation knob on the side opposite to a tracing stylus to easily confirm a relative position with respect to an object. An object of the present invention is to provide a displacement sensor free from displacement of a displacement sensor by an operation.

[0006]

In order to achieve the first object, a displacement sensor according to the present invention comprises a bobbin on which a coil is mounted and a core which moves with the movement of a probe. In a displacement sensor that detects the displacement of the tracing stylus as an electric signal, there is provided a manual operation means for retracting the tracing stylus by operating an operation knob provided on a side of the case main body opposite to the tracing stylus side, The manual operating means is provided with the operation knob rotatably provided by projecting a part of the operation body out of the case main body, and a lever for retreating the measurement element in cooperation with the measurement element on the case main body at a base end thereof. A lever member is provided so as to be swingable at a portion, and a lever member that swings about a swing center by a rotation operation of the operation knob is a first arm and a second arm.
And an arm with the bent portion as a swinging fulcrum. The tip of the second arm of the lever member is brought into contact with the lever, and the end of the operation knob is connected to the first arm of the lever member. It is characterized by being configured to contact the tip of the arm from below.

[0007] The manual operation means may be provided with a latch means for holding the tracing stylus in a retracted state. The latch means may be formed by forming a recess with a step in the lower end of the arm of the lever member with which the operation knob contacts.

[0008]

With this configuration, it is possible to operate the operation knob to operate the manual operation means and to retract the tracing stylus. This makes it easy to confirm the relative position between the tracing stylus and the object to be operated on the opposite side, and since the movement is in a direction perpendicular to the movement of the tracing stylus, there is no displacement of the displacement sensor due to the operation of the operation knob.

By providing the manual operating means with latch means for holding the measuring element in the retracted state, the latch means can hold the measuring element in the retracted state. Workability at the time of adjustment is significantly improved.

[0010]

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

Embodiment 1 FIG. 1A is a plan view of a displacement sensor according to the present invention.
(2) is a side view of the displacement sensor, (3) is a bottom view of the displacement sensor, (4) is a front view of the displacement sensor, and (1) of FIG. 2 is a partially broken view of the displacement sensor according to the present invention. 2 (2) is an explanatory view of a configuration of a latch means of a manual operation mechanism in the displacement sensor, and FIG. 3 is a partially cutaway and sectional front view of the displacement sensor.

The displacement sensor according to the present invention includes a case body 3 including a base 1 and a cover 2. That is,
The base 1 is formed by rising walls 5 and 6 at the front and rear ends of a bottom wall 4 thereof, and a sliding hole, which is one bearing D, is provided above the front wall 5. 7, a front substrate supporting portion 8 is formed in the upper portion of the front side wall portion 5 so as to be located inward thereof, and a through hole portion 9 is formed in the upper portion of the front substrate supporting portion 8. And a spring seat 10 are formed.

On the inner surface of the bottom wall 4, a rigid wall 11 is raised. Front and rear holding portions 12 and 13 are formed in front of and above the rear end of the rigid wall portion 11, and an oblique cut portion is formed below the rear holding portion 13 of the rigid wall portion 11. A terminal receiving portion 15 for forming 14 is formed. The front holding portion 12 is composed of a hole 16 and a fitting projection 17 which is a support-side fitting portion formed by projecting a peripheral portion of the hole 16. It is formed by a flat holding surface portion 18.

Further, at the rear of the inner surface of the bottom wall 4,
The rear substrate support portion 19 is raised with its base portion connected to the rear portion of the rigid wall portion 11. A sliding hole 20 as the other bearing portion E is formed on the upper portion of the rear substrate supporting portion 19.

The upper portion of the rigid wall portion 11 has
A bobbin assembly 21 is provided with its front and rear portions held by rear holding portions 12 and 13. That is, the bobbin assembly 21 includes a bobbin 22, the bobbin 22 has an inner hole 23, and coil winding portions 24A and 24B are formed around the outer periphery thereof. A fitting recess 25 is formed at the front end. One coil 26A is connected to the coil winding portion 24A of the bobbin 22, and the other coil 26B is connected to the coil winding portion 24B. The outer tube 27 is provided on the outer periphery of the bobbin 22. It is fitted.

Further, the rear end of the bobbin 22 is
The bobbin terminal 28 is fixed as shown in FIG. The bobbin terminal 28 is formed by insert molding terminals 28a, 29, 30 to which the ends of the coils 26A, 26B are connected into a resin block 28A, and a part of the terminal 28a has a resilient fixing piece. 31 to form the fixed piece 31
Are projected from the resin block 28A.

The bobbin assembly 21 constructed as described above fits the fitting concave portion 25 at the front end thereof into the fitting convex portion 17 of the front holding portion 12 and the bobbin terminal 28 at the rear end portion. The fixing piece 31 is inserted into the cutout 14 of the rigid wall section 11, and the fixing piece 31 is pressed against the terminal receiving section 15, and the rigid wall section 1 is utilized by utilizing the spring property of the fixing piece 31.
It is attached to 1.

A shaft portion 32A of the tracing stylus 32 is slidably inserted into the sliding hole 7 above the front side wall portion 5. The holding shaft portion 32B connected to the rear end of the shaft portion 32A is It penetrates through hole 9 of front substrate support 8 and is inserted into hole 16 of front holder 12. A core 33 is located in the inner hole 23 of the bobbin 22. A front end of the core 33 is a rear end of the tracing stylus 32, that is, a holding shaft 32.
B is connected via a collar 34. The rear end of the core 22 is held on a holding shaft 35 via a collar 36. The holding shaft 35 is slidably inserted into the sliding hole 20 in the upper part of the rear substrate support 11. Have been. The bobbin assembly 21 and the core 33 constitute a differential transformer mechanism A.

A spring receiving member 37 is attached to the front side of the shaft portion 32A of the tracing stylus 32. A movable spring 38 is provided between the spring receiving member 37 and the spring seat portion 10 of the front substrate supporting portion 8. The probe 32 is projected forward by the urging force of the movable spring 38, and the core 33 is set at the initial position.

A manual operating mechanism B, which is a manual operating means, is provided behind the rigid wall portion 11. The manual operation mechanism B includes a lever 40, a lever member 45, and an operation knob 46. The lever 40 is provided at a base end of a support portion 41 formed on the bottom wall 4 of the base 1. It is attached by a fulcrum pin 42, and a hole 43 is formed in the upper part of the lever 40. The rear end of the holding shaft 35 is inserted into the hole 43, and the rear end of the holding shaft 35 A stopper 44 is fixed to the portion, and the stopper 44 is hung on the upper portion of the lever 40.

A torsion spring 50 is mounted on the base end of the lever 40. One of the torsion springs 50A is provided with a locking hole provided at an intermediate portion of the lever 40. 40
a, and the other piece 50B of the torsion spring 50 is in contact with a later-described vertical substrate, and the lever 40 is pressed forward by the urging force of the torsion spring 50. ing.

The lever member 45 includes first and second arms 45.
A and 45B are arranged at a substantially right angle, and the bent portion thereof is used as a swing fulcrum.
a is projected. Further, as shown in FIG. 2 (2), a pair of arm portions 45a of the first arm 45A is provided.
A recess 49 having a step, which is a latch means, is formed at a lower portion of the distal end where the rod portion 46a of the operation knob 46 contacts, and an arc-shaped contact portion 47 is formed on the second arm 45B.
Is formed. The lever member 45 is attached to a support portion 48 at an intermediate portion of the rear substrate support portion 19 by a fulcrum pin 49.
The lever 40 is mounted between the pair of arm portions 45a of the first arm 45A, and the contact portion 47 of the second arm 45B is located between the pair of arm portions 45a of the first arm 45A. Portion of the spring 50 is in contact with one piece 50A of the spring 50.

The operation knob 46 is swingably attached to the rear wall portion 6 of the base 1 at a middle portion thereof by a fulcrum pin 46A, and the rod portion 46a of the operation knob 46 is connected to the first lever member 45 by the first portion. It is in contact with the tip of the arm 45a of the arm 45A from below.

The base 1 has a substrate 51 held at the upper ends of the front and rear substrate supporting portions 8 and 11, and a substrate 52 positioned on the inner surface side of the rear wall portion 6, and further has a left side. And the substrates 53 are fixed to each other. The rear wall portion 6 of the base 1 is provided with a connector connection portion 54, and the connector connection portion 54 has a connector 55
The cable 56 is attached via the. The terminals 57 of the connector 55 are soldered to the circuit of the board 52. A cover 2 is attached to the base 1.

Next, the operation will be described. When an alternating current is applied,
A current flows through both coils 26A and 26B by electromagnetic induction. When the core 33 is at the center, the voltages generated in the two coils 26A and 26B are equal.

When a moving body (not shown) interferes with the tracing stylus 32 and the tracing stylus 32 retreats, the core 33 moves off-center and rearward against the torsion spring 50. Many are inserted into the coil 26B side. Therefore, the voltage induced in the coil 26B becomes higher, and the output voltage changes in proportion to the amount of movement of the core 33. This output voltage detects the amount of change to detect the displacement of the moving body.

To manually operate (raise) the tracing stylus 32, the operation knob 46 is rotated clockwise to move the first arm 45A of the lever member 45 with the rod portion 46A. Push it up and lever 4
5 is rotated in a counterclockwise direction, and the lever 40 is rotated backward against the urging force of the torsion spring 50 to hold the lever 40 via a stopper 44 at the rear end of the holding shaft 35. This is performed by moving the shaft 35 backward and moving the tracing stylus 32 backward.

The stepped recess 4 is formed at the lower end of the arm portion 45a of the lever member 45 with which the operation knob 46 contacts.
Since the operation knob 46 is rotated to retract the tracing stylus 32, the operation knob 46
Is engaged with the concave portion 49 of the arm portion 45a, the tracing stylus 32 can be held in a retracted state, and workability in measurement, mounting of the displacement sensor, and adjustment is remarkably improved.

Embodiment 2 FIG. 5 shows a displacement sensor according to Embodiment 2 of the present invention. The manual operation mechanism B which is the manual operation means in the second embodiment has a configuration using a coil spring 58 instead of the torsion spring of the manual operation mechanism B in the first embodiment.
The coil spring 58 is interposed between the stopper 44 and the rear substrate 52, and the other configuration and operation are the same as those of the manual operation mechanism B in the first embodiment.

[0030]

As described in detail above, the displacement sensor according to the present invention is provided with a core that moves with the movement of a probe in a bobbin on which a coil is mounted, and converts the displacement of the probe into an electric signal. In the displacement sensor for detecting, a manual operating means for retracting the tracing stylus by operating an operation knob provided on a side opposite to the tracing stylus side of the case main body is provided, and the manual operating means is provided in the case main body. The operation knob is provided rotatably by projecting a part thereof to the outside,
A lever is provided in the case main body to swing back at the base end thereof in association with the tracing stylus to pivot the tracing stylus. The first arm and the second arm are connected to each other with the bent portion as a swing fulcrum, the tip of the second arm of the lever member is brought into contact with the lever, and the end of the operation knob is connected to the lever. By being configured to make contact with the distal end of the arm portion of the first arm of the member from below, it is possible to operate the operation knob to operate the manual operation means to retract the tracing stylus.

Further, the manual operating means is provided with latch means for holding the probe in a retracted state, and the latch means is provided on a stepped portion at a lower end of an arm of the lever member with which the operating knob comes into contact. When the operation knob is rotated to retract the tracing stylus, the tip of the operation knob engages with the stepped recess at the lower end of the arm. By doing so, the tracing stylus can be held in a retracted state, and the workability during measurement and mounting and adjustment of the displacement sensor is significantly improved.

[Brief description of the drawings]

FIG. 1A is a plan view of a displacement sensor according to the present invention. (2) is a side view of the same displacement sensor. (3) is a bottom view of the displacement sensor. (4) is a front view of the same displacement sensor.

FIG. 2 (1) is a partially cutaway and cross-sectional side view of a displacement sensor (Example 1) according to the present invention. (2) is a structural explanatory view of a latch means of a manual operation mechanism in the displacement sensor.

FIG. 3 is a partially cutaway front view of the displacement sensor.

FIG. 4 is a perspective view of a bobbin terminal in the displacement sensor.

FIG. 5 is a partially cutaway and cross-sectional side view of a displacement sensor (Example 2) according to the present invention.

FIG. 6 is a sectional view of a conventional displacement sensor.

FIG. 7 is an explanatory diagram of a manual operation in the displacement sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 2 Cover 3 Case main body 11 Rigid wall part 22 Bobbin 32 Measuring element 33 Core 46 Operation knob B Manual operation mechanism (manual operation means)

────────────────────────────────────────────────── (5) References JP-A-58-198701 (JP, A) JP-A-2-37320 (JP, U) JP-A-59-187707 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) G01D 5/00-5/62 G01B ⁷ /00-7/34

Claims (2)

(57) [Claims] 1. A displacement sensor for providing a core that moves with the movement of a stylus in a bobbin on which a coil is mounted and detecting a displacement of the stylus as an electric signal. Manual operation means for retracting the tracing stylus by operating an operation knob provided on the opposite side is provided, and the manual operation means rotates the operation knob by projecting a part of the case body to the outside. And a lever for retracting the probe in association with the probe is swingably provided at the base end of the case main body, and pivoted about a pivot center by a rotation operation of the operation knob. A lever member is formed by connecting a first arm and a second arm with a bending portion thereof as a swing fulcrum, a tip of a second arm of the lever member abuts on the lever, and an end of the operation knob. The first part of the lever member A displacement sensor characterized in that it is configured to abut against the tip of an arm portion of the arm from below. 2. The manual operation means includes a latch means for holding the tracing stylus in a retracted state, and the latch means is provided on a stepped portion of a lower end of an arm portion of the lever member with which the operation knob comes into contact. 2. The displacement sensor according to claim 1, wherein the concave sensor has a concave portion.