JPH0618536A - Hand-hold rotation indicator - Google Patents

Abstract

PURPOSE:To properly use contact and noncontact systems in a handheld revolution indicator with an extremely simple structure and operation. CONSTITUTION:An optical revolution detecting system 4 and contact revolution detecting system 6 are arranged in parallel in a case 2. The optical revolution detecting system 4 has a light emitting-receiving means 8 which emits and receives light to and from an object M1 to be measured and a light passing opening 2a is formed through the case 2 at the position where the emitting- receiving optical axis (x) of the means 8 intersects the case 2. The contact revolution detecting system 6 has a rotating shaft 14 at a position deviated from the axis (x) and one end side of the shaft 14 is protruded outward from the case 2. A contactor 21 which is brought into contact with an object M2 to be measured is put on the protruded section and a light reflecting chopper 25 which intermittently reflects light from the means 8 is fixed to the other end side of the shaft 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handheld tachometer which is both contact type and non-contact type.

[0002]

2. Description of the Related Art Generally, handheld tachometers include a contact type tachometer in which a contact is pressed against an object to be measured to read the number of revolutions of the object to be measured, and a handheld tachometer which reflects at one or more points on the object to be measured. Irradiate the DUT with light with the seal attached,
There is a non-contact type in which the number of rotations of the object to be measured is read from the change in light intensity caused by the presence or absence of a reflective seal.

The former contact type has the advantage that the number of revolutions of the object to be measured can be read directly, the resolution is relatively high, and the presence or absence of angular velocity fluctuations can be determined, but the rotational torque of the object to be measured is There is a drawback in that the number of rotations cannot be measured in the case of a small size or in a place where there is a danger due to the rotation of the measured object.

On the other hand, the latter non-contact type has a characteristic contradictory to the contact type, and since it can measure even at a position away from the object to be measured, it can be used in a place where safety is required, Although it is possible to measure the rotating torque of the object to be measured, it is difficult to measure the number of rotations of the object to be measured easily and accurately.

Therefore, in the prior art, there is provided a handheld tachometer which can be used both as a contact type and as a non-contact type so as to make up for the drawbacks of the both (for example, Japanese Utility Model Publication No. 57-179164). (See gazette).

In this apparatus, a non-contact type handheld tachometer is used as a main body, and a contact type adapter is detachably attached to the main body. When the adapter is attached to the main body, the adapter is contact type When removed from, use as a non-contact type.

[0007]

However, in the conventional handheld tachometer of this type, the adapter needs to be attached to and detached from the main body each time it is selectively used as a contact type or a non-contact type, which is extremely troublesome to handle. Is.

The present invention has been made in order to solve the above-mentioned problems, and the contact type and the non-contact type can be selectively used without attaching or detaching an adapter as in the conventional case. An object of the present invention is to make it possible to automatically measure the number of rotations without switching the internal signal processing circuit for proper use so that the rotation speed can be easily measured.

[0009]

The present invention adopts the following constitution in order to solve the above problems.

That is, in the handheld tachometer according to the present invention, an optical rotation detecting system and a contact rotation detecting system are arranged side by side in a case, and the optical rotation detecting system irradiates an object to be measured with light. It has a light emitting and receiving means for receiving the reflected light from the object to be measured, and the case is formed with a light passage opening at a position where the light emitting and receiving axes of the light emitting and receiving means intersect with each other. The system has a rotating shaft arranged at a position deviated from the light emitting and receiving shaft of the light emitting and receiving means, one end side of the rotating shaft is projected to the outside of the case, and the projected portion is brought into contact with the object to be measured. A contact is attached, and a light reflection chopper that intermittently reflects the light from the light emitting and receiving means as the rotation shaft rotates is fixed to the other end side of the rotation shaft.

[0011]

When used as a non-contact type, the light projecting / receiving means constituting the optical rotation detecting system irradiates the object to be measured through the light passage opening of the case and reflects light from the object to be measured. Light is received through the light passage opening. Then, the number of rotations of the object to be measured is measured based on the detection output from the light emitting and receiving means.

In the case of using the contact type, when the contact is pressed against the object to be measured, the rotating shaft to which the contact is attached rotates, so that the light reflection chopper fixed to the rotating shaft is thrown accordingly. The light from the light receiving means is intermittently reflected.
Then, the reflected light is received by the light emitting / receiving means, and the number of rotations of the object to be measured is measured based on the detection output thereof.

[0013]

Embodiment 1 FIG. 1 is an overall configuration diagram of a handheld tachometer according to Embodiment 1 of the present invention, and FIG. 2 is a front view of a light reflection chopper portion.

The handheld tachometer 1 of this embodiment is
An optical rotation detection system 4 and a contact rotation detection system 6 are provided inside the case 2.

The optical rotation detecting system 4 irradiates light onto a measurement object M _1, having a light emitting and receiving unit 8 for receiving light reflected from the measurement object M _1. The light emitting and receiving means 8 is
The lens 10 is composed of a light emitting element 11 such as a light emitting diode and a light receiving element 12 such as a phototransistor which are arranged close to each other. Then, in the case 2, the light emitting and receiving means 8 is provided.
A light passage opening 2a is formed at a position where the light projecting / receiving axis x intersects. The light passage opening 2a may be provided with a sealing glass or the lens 10 may be directly attached.

On the other hand, the contact rotation detection system 6 has a rotation shaft 14 which is arranged so as to be inclined at a predetermined angle from the light emitting / receiving axis x. The rotary shaft 14 is rotatably supported by being inserted through a pair of bearings 15 and 16 and a spacer 18 for restricting the positions of both the bearings 15 and 16, and is rotatably supported.
Large diameter part 14a and stop ring 2 provided in the middle part of
0 is used to prevent the bearings 15 and 16 from coming off. Further, one end side of the rotary shaft 14 penetrates the rotary shaft insertion hole 2b formed in the case 2 and is projected to the outside of the case 2, and the measured object M ₂
The contactor 21 to be contacted with is fitted. The contactor 21 is configured by attaching a conical rubber cap 23 to the tip of a cylindrical plug 22 whose idling is restricted by a pin 24. A light reflection chopper 25, which intermittently reflects the light from the light emitting and receiving means 8 as the rotation shaft 14 rotates, is fixed to the other end of the rotation shaft 14 with a screw 28. As shown in FIG. 2, the light reflection chopper 25 is configured by attaching a reflection seal 27 to the surface of an L-shaped rotating plate 26 attached to the rotating shaft 14.

Reference numeral 30 is a magnet for attracting the light reflection chopper 25, 32 is a power source for the light emitting element 11 and the light receiving element 12, 34 is a calculation section for calculating the number of revolutions based on a detection signal from the light receiving element 12, and 36 is A display such as an LCD for displaying the calculation result of the calculation unit 34, and 38 is a reflection sticker attached to the object to be measured M ₁ .

When the handheld tachometer 1 of the first embodiment is used as a non-contact type, the optical rotation detection system 4 is used.

That is, in this case, since no external force is applied to the contactor 21, the light reflection chopper 25 is connected to the magnet 30.
And the light-receiving / receiving axis x of the light-receiving / receiving means 8 as shown in the figure.
It is in a position retracted from. Therefore, the light from the light emitting element 11 passes through the light passage opening 2a of the case 2 without being blocked by the light reflection chopper 25, and is irradiated toward the DUT M ₁ . As the DUT M ₁ rotates, the reflection seal 38 attached to the DUT M ₁ also rotates at the same time, and the irradiation light is reflected when the reflection seal 38 reaches the position crossing the light emitting and receiving axis x. The reflected light is transmitted through the light passage opening 2a.
And is received by the light receiving element 12. Then, the detection output received by the light receiving element 12 is sent to the calculation unit 34, so that the calculation unit 34 calculates the number of revolutions per revolution of the object to be measured M ₁ based on the pulse frequency of the detection output. ,
The calculation result is displayed on the display 36.

When used as a contact type, the optical rotation detection system 4 is used together with the contact rotation detection system 6.

That is, in this case, when the contactor 21 is pressed against the object to be measured M ₂ which is rotating, the rotary shaft 14 simultaneously rotates together with the contactor 21. Accordingly, the rotary shaft 1
Since the light reflection chopper 25 fixed to 4 crosses the light emitting / receiving axis x at a cycle corresponding to the rotation speed of the object to be measured M ₂ , light from the light emitting element 11 is intermittently reflected by the reflection seal 27 of the light reflection chopper 25. The reflected light is received by the light receiving element 12. After that, the same processing as in the case of the non-contact type is performed, and the rotation speed of the object to be measured M ₂ is displayed.

Embodiment 2 FIG. 3 is an overall configuration diagram of a handheld tachometer corresponding to Embodiment 2, and FIG. 4 is a front view of a light reflection chopper portion, and the portions corresponding to FIGS. 1 and 2 are the same. Is attached.

The feature of the second embodiment is that the contact rotation detection system 6 is used.
Is arranged at a position displaced by a predetermined distance from the light emitting / receiving axis x of the light emitting / receiving means 8 and substantially parallel to the light emitting / receiving axis x. 25 is that the disc 39 ′ is fixed to the rotary shaft 14 with the screw 28, and the reflection seal 27 is attached to a part of the surface of the disc 39. The other configurations are similar to those of the first embodiment, and thus the description thereof is omitted.

In the structure of the second embodiment, since a part of the disc 39 of the light reflection chopper 25 always blocks the light from the light emitting element 12, only about half of the light of the light emitting element 12 can be used. In either case of using the non-contact type or the contact type, the intensity of light incident on the light receiving element 12 changes according to the rotation of the object to be measured (not shown). It has a frequency proportional to the number of revolutions of the object, which allows the number of revolutions of the object to be measured to be measured.

In particular, in the case of the second embodiment, since the optical rotation detection system 4 and the contact rotation detection system 6 are parallel to each other, the direction of the entire case 2 is not oriented when measuring the rotation speed of the object to be measured. There is no need to change much depending on the contact type and the contact type.

Third Embodiment FIG. 5 is an overall configuration diagram of a handheld tachometer corresponding to the third embodiment, and parts corresponding to those in FIGS. 1 and 2 are designated by the same reference numerals.

The feature of the third embodiment is that the contact rotation detection system 6 is used.
Is arranged substantially orthogonal to the light emitting / receiving axis x of the light emitting / receiving means 8, and the light reflection chopper 25 has a stepped portion 14b formed by cutting out an end portion of the rotary shaft 14. The reflection seal 27 is attached to the step portion 14b, and the compression spring 40 is provided between the large diameter portion 14a provided in the intermediate portion of the rotary shaft 14 and the one bearing 15.
Is provided, whereby the rotating shaft 14 is provided so as to be able to move forward and backward with respect to the light emitting and receiving shaft x. The other configurations are similar to those of the first embodiment, and thus the description thereof is omitted.

When the handheld tachometer 1 of the third embodiment is used as a non-contact type, since no external force is applied to the contact 21, the rotary shaft 14 is moved outward of the case 2 by the force of the compression spring 40. It is in a position where it is projected and retracted from the light emitting / receiving axis x of the light emitting / receiving means 8 as shown in the drawing. Therefore, the light from the light emitting element 11 passes through the light passage opening 2a of the case 2 without being blocked by the light reflection chopper 25,
The object to be measured (not shown) is irradiated. Then, the reflected light from the object to be measured is received by the light receiving element 12.

On the other hand, when the contact type is used, when the contact 21 is pressed against the rotating object to be measured, the rotating shaft 1
4 not only rotates with the contact 21, but also slides to the right in the figure against the spring force of the compression spring 40, and the light reflection chopper 25 is positioned so as to cross the light projecting / receiving axis x. And
With the rotation of the rotating shaft 14, the light from the light emitting element 11 is intermittently reflected by the reflection seal 27 of the light reflection chopper 25,
The reflected light is received by the light receiving element 12.

[0030]

According to the present invention, the contact type and the non-contact type can be selectively used without attaching and detaching the adapter as in the conventional case, and the internal signal processing circuit can be used for both types. Since the measurement is automatically performed without switching, the rotation speed of the object to be measured can be measured very easily. In the above-mentioned embodiment, when using as a contact type, it is desirable to shield the light passage opening of the case with a shield plate (not shown).

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a handheld tachometer according to a first embodiment of the present invention.

FIG. 2 is a front view of a light reflection chopper portion of the tachometer of FIG.

FIG. 3 is an overall configuration diagram of a handheld tachometer according to a second embodiment of the present invention.

FIG. 4 is a front view of a light reflection chopper portion of the tachometer of FIG.

FIG. 5 is an overall configuration diagram of a handheld tachometer according to a third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Handheld tachometer, 2 ... Case, 2a ... Light passage opening, 4 ... Optical rotation detection system, 6 ... Contact rotation detection system, 8
... light emitting and receiving unit, 14 ... rotary shaft, 21 ... contact, 25 ... light reflection chopper, M _1, M ₂ ... DUT, x ... projection receiving axis.

Claims (1)

[Claims] 1. An optical rotation detection system and a contact rotation detection system are provided side by side in the case, and the optical rotation detection system irradiates an object to be measured with light and
The case has a light emitting / receiving means for receiving the reflected light from the object to be measured, and the case has a light passage opening formed at a position where the light emitting / receiving axis of the light emitting / receiving means intersects. The detection system has a rotating shaft arranged at a position displaced from the light emitting and receiving shaft of the light emitting and receiving means, one end side of the rotating shaft is projected to the outside of the case, and the projected portion contacts the object to be measured. And a light reflection chopper for intermittently reflecting the light from the light emitting and receiving means in association with the rotation of the rotary shaft is fixed to the other end side of the rotary shaft. Handheld tachometer characterized by.