JP6552872B2 - Measuring instrument - Google Patents

Description

  The present invention relates to a measuring device provided with a spindle that moves along its axial direction.

Conventionally, a spindle that moves along its own axial direction, a housing having an insertion hole for inserting the spindle, and a bellows for an insertion hole that covers the insertion hole by being attached so as to straddle the spindle and the housing. Measuring instruments such as linear gauges and indicators are known.
For example, the length measuring device (measuring device) described in Patent Document 1 includes a spindle, a case (housing), and a bellows (bellows for insertion holes). According to this, since the length measuring device can close the insertion hole for inserting the spindle formed in the case with the bellows, the case can be sealed, and oil mist, dust, water droplets, etc. It is possible to prevent the intrusion into the inside.

Japanese Utility Model Application Publication No. 3-81503

  However, in such a measuring device, the volume inside the housing changes due to the expansion and contraction of the insertion hole bellows, which in turn changes the pressure, so oil mist, dust, water droplets, etc. are present in the housing. There is a problem that suction is performed through the gap, which adversely affects various devices provided inside the housing.

  An object of the present invention is to provide a measuring device capable of suppressing pressure change inside a housing.

The measuring instrument of the present invention includes a spindle that moves along its own axial direction, a housing having an insertion hole for inserting the spindle, and an insertion hole that covers the insertion hole by being mounted across the spindle and the housing. A measuring instrument provided with a bellows, and the housing communicates with the outside, and is provided in the housing so as to close the air hole and an air hole that allows air to enter and exit from the inside of the housing, Pressure adjustment means for adjusting the pressure by changing the internal volume of the housing by changing its own shape is provided . The pressure adjustment means is an air hole bellows, and connects the spindle and the air hole bellows. together, characterized Rukoto comprises a connecting member extending and retracting the bellows air hole in accordance with the movement of the spindle.

According to such a configuration, the measuring instrument is provided in the casing so as to block air in and out of the casing, and the shape of the measuring instrument is changed by changing its own shape. Since the pressure adjustment means for adjusting the pressure by changing the internal volume of the body is provided, the pressure adjustment means can suppress the pressure change inside the housing. Therefore, the measuring instrument can reliably prevent the intrusion of oil mist, dust, water droplets and the like into the inside of the housing.
Here, the pressure adjusting means may be configured to passively change its shape in accordance with a change in pressure inside the housing accompanying expansion and contraction of the insertion hole bellows. It may be configured to actively change its own shape regardless of the accompanying pressure change inside the housing. Further, since the pressure adjusting means is an air hole bellows, the same components as the insertion hole bellows can be used. Therefore, the measuring instrument can facilitate adjustment of pressure and can simplify its configuration. Furthermore, since the insertion hole bellows and the air hole bellows interlock and expand and contract in conjunction with the movement of the spindle, the measuring device can further facilitate the adjustment of pressure.

  In the present invention, the pressure adjusting means is preferably a diaphragm.

  According to such a configuration, since the pressure adjusting means is a diaphragm, the durability of the pressure adjusting means can be improved as compared with the case where other parts are adopted as the pressure adjusting means, and It can be miniaturized.

  In the present invention, it is preferable to provide a filter that closes the air hole and allows air to enter and exit from the inside of the housing, and the pressure adjustment unit is provided inside the housing.

  According to such a configuration, since the pressure adjusting means is provided inside the housing, the measuring instrument can be miniaturized as compared with the case where the pressure adjusting means is provided outside the housing. In addition, since the measuring device closes the air hole and includes a filter that allows the air to enter and exit from the inside of the housing, it is possible to prevent oil mist, dust, water droplets and the like from intruding inside the housing.

  In the present invention, a measuring means for measuring the amount of movement of the spindle is provided inside the housing, and a protective partition wall is provided inside the housing and for protecting the measuring means by covering the measuring means. Is preferred.

  According to such a configuration, the measuring instrument is provided inside the housing, and is provided with a protective partition that protects the measuring means by covering the measuring means, so that the measuring means such as oil mist, dust, water droplets etc. Can prevent the negative effects of

The schematic diagram which shows the cross section of the linear gauge which concerns on 1st Embodiment of this invention A schematic diagram showing the linear gauge with the spindle pushed in The schematic diagram which shows the cross section of the linear gauge which concerns on 2nd Embodiment of this invention The schematic diagram which shows the principal part cross section of the linear gauge which concerns on 3rd Embodiment of this invention The schematic diagram which shows the cross section of the linear gauge which concerns on 4th Embodiment of this invention

First Embodiment
Hereinafter, a first embodiment of the present invention will be described based on the drawings.
FIG. 1 is a schematic view showing a cross section of a linear gauge according to a first embodiment of the present invention.
The linear gauge 1 is, as shown in FIG. 1, a cylindrical case 2 and a spindle 3 which is inserted into the case 2 and moves along its own axial direction (vertical direction on the paper surface), and the case 2 And a bellows 4 mounted so as to straddle the spindle 3.

The housing 2 is formed concentrically with the housing 2, and the spindle holding portion 5 formed so as to protrude from the lower end surface (the end surface on the lower side of the paper) of the housing 2, A detection unit 6 that is housed inside and detects the amount of movement of the spindle 3, an air hole 7 that is formed on the upper end surface of the housing 2 and communicates with the outside, and allows air to enter and exit the housing 2. And an air hole bellows 8 provided inside the housing 2 so as to close the air hole 7.
In addition, the cross-sectional shape of the air hole 7 may be any shape, for example, it can be formed in a circle, a rectangle, or the like. Further, in the present embodiment, the air hole bellows 8 is provided inside the housing 2, but may be provided outside the housing 2.

  The spindle holding portion 5 is provided with a guide member 51 which is attached to the inside and has a tubular shape for inserting the spindle 3. The inner diameter of the guide member 51 is slightly larger than the outer diameter of the spindle 3. Therefore, the spindle holder 5 functions as an insertion hole into which the spindle 3 is inserted. Further, the bellows 4 functions as an insertion hole bellows covering the insertion hole (hereinafter referred to as the insertion hole bellows 4).

The spindle 3 is provided with a measuring element 31 provided at its tip and brought into contact with the work when measuring the linear gauge 1, and a scale 32 provided at its base end and provided to face the detection unit 6 ing.
The linear gauge 1 is provided with a spring (not shown) that biases the spindle 3 toward the tip end side of the spindle 3.

The linear gauge 1 detects the amount of movement of the scale 32 that moves relative to the detection unit 6 by causing the probe 31 to abut the work and pushing the spindle 3 into the inside of the housing 2 to the detection unit 6. The amount of movement of the scale 32 is output as the amount of movement (measured value) of the spindle 3.
Note that the detection unit 6 can adopt, for example, an optical sensor that detects relative movement of the scale 32 by irradiating light toward the scale 32 and receiving light reflected from the scale 32. .

FIG. 2 is a schematic view showing the linear gauge in a state in which the spindle is pushed.
As shown in FIG. 2, when the spindle 3 is pushed into the inside of the housing 2 (refer to the arrow in the figure), the insertion hole bellows 4 contracts as the spindle 3 moves. At this time, since the volume inside the housing 2 is reduced, the pressure inside the housing 2 will rise. When the pressure inside the housing 2 rises, the air hole bellows 8 contracts due to a pressure change inside the housing 2 while discharging air to the outside of the housing 2 through the air hole 7. .

  Further, when the spindle 3 is released, the spindle 3 is urged toward the tip end side by being biased by the above-mentioned spring, and therefore the insertion hole bellows 4 is, as shown in FIG. Will move along with the movement of the At this time, the internal volume of the housing 2 becomes large, so the pressure inside the housing 2 drops. When the pressure in the housing 2 is lowered, the air hole bellows 8 extends due to the pressure change in the housing 2 while suctioning air into the housing 2 via the air hole 7. .

  Therefore, in the present embodiment, the air hole bellows 8 functions as pressure adjusting means for changing the volume inside the housing 2 to adjust the pressure by changing its own shape.

According to such this embodiment, the following operations and effects can be achieved.
(1) The linear gauge 1 is provided in the housing 2 so as to close the air hole 7 and the air hole 7 for allowing air to enter and exit from the inside of the housing 2. Since the pressure adjustment means for adjusting the pressure by changing the volume inside the body 2 is provided, the pressure change means can suppress the pressure change inside the housing 2. Therefore, the linear gauge 1 can reliably prevent the entry of oil mist, dust, water droplets and the like into the inside of the housing 2.

(2) Since the pressure adjusting means is provided inside the housing 2, the linear gauge 1 can be miniaturized as compared with the case where it is provided outside the housing 2.
(3) Since the pressure adjusting means is the air hole bellows 8, the same parts as the insertion hole bellows 4 can be used. Therefore, the linear gauge 1 can facilitate adjustment of pressure and simplify its configuration.

Second Embodiment
Hereinafter, a second embodiment of the present invention will be described based on the drawings.
In the following description, the same reference numerals are given to parts that have already been described, and the description thereof is omitted.

FIG. 3 is a schematic view showing a cross section of a linear gauge according to a second embodiment of the present invention.
In the first embodiment, the air hole bellows 8 is expanded and contracted due to the pressure change inside the housing 2.
On the other hand, in this embodiment, the linear gauge 1A connects the spindle 3 and the air hole bellows 8 as shown in FIG. 3, and expands and contracts the air hole bellows 8 as the spindle 3 moves. It differs from the first embodiment in that the connecting member 9 is provided.

When the spindle 3 is pushed into the housing 2, the insertion hole bellows 4 contracts as the spindle 3 moves. When the spindle 3 is pushed into the inside of the housing 2, the air hole bellows 8 is pushed and contracted by the connecting member 9 that moves along with the movement of the spindle 3.
Further, when the spindle 3 is released, the spindle 3 is biased by the spring described above and protrudes toward the tip end side thereof, so that the insertion hole bellows 4 expands as the spindle 3 moves. It will be. When the spindle 3 is pushed into the interior of the housing 2, the air hole bellows 8 is pulled and extended by the connecting member 9 that moves as the spindle 3 moves.

Also in such a present embodiment, in addition to the same action and effect as the first embodiment, the following action and effect can be obtained.
(4) Since the insertion hole bellows 4 and the air hole bellows 8 expand and contract in conjunction with the movement of the spindle 3, the linear gauge 1A can further easily adjust the pressure.

Third Embodiment
Hereinafter, a third embodiment of the present invention will be described based on the drawings.
In the following description, the same reference numerals are given to parts that have already been described, and the description thereof is omitted.

FIG. 4 is a schematic view showing the cross section of the main part of a linear gauge according to a third embodiment of the present invention.
In the first embodiment, the linear gauge 1 includes the air hole bellows 8 provided inside the housing 2 so as to close the air hole 7.
On the other hand, in the present embodiment, as shown in FIG. 4, the linear gauge 1 B includes the diaphragm 10 provided inside the housing 2 so as to close the air hole 7. It differs from one embodiment.

  When the spindle 3 is pushed into the housing 2, the insertion hole bellows 4 contracts as the spindle 3 moves. At this time, since the volume inside the housing 2 is reduced, the pressure inside the housing 2 will rise. The diaphragm 10 discharges air to the outside of the housing 2 via the air hole 7 when the pressure inside the housing 2 rises, and on the air hole 7 side due to the pressure change inside the housing 2 Bulge out.

  Further, when the spindle 3 is released, the spindle 3 is urged toward the tip end side by being biased by the above-described spring, so that the insertion hole bellows 4 is extended along with the movement of the spindle 3 It will be. At this time, the internal volume of the housing 2 becomes large, so the pressure inside the housing 2 drops. The diaphragm 10 sucks air into the inside of the housing 2 through the air hole 7 when the pressure inside the housing 2 drops, and is opposite to the air hole 7 due to the pressure change inside the housing 2 It bulges to the side.

  Therefore, in the present embodiment, the diaphragm 10 functions as a pressure adjusting unit that adjusts the pressure by changing the internal volume of the housing 2 by changing its shape.

Also in such a present embodiment, in addition to the same action and effect as (1) and (2) in the first embodiment, the following action and effect can be obtained.
(5) Since the pressure adjusting means is the diaphragm 10, the durability of the pressure adjusting means can be improved and the linear gauge 1B can be miniaturized as compared with the case where other parts are adopted as the pressure adjusting means. be able to.

Fourth Embodiment
Hereinafter, a fourth embodiment of the present invention will be described based on the drawings.
In the following description, the same reference numerals are given to parts that have already been described, and the description thereof is omitted.

FIG. 5 is a schematic view showing a cross section of a linear gauge according to a fourth embodiment of the present invention.
The linear gauge 1C is a measuring device provided with a housing 2, a spindle 3 and an insertion hole bellows 4 as shown in FIG.
The housing 2 includes a spindle holding unit 5, a detection unit 6, an air hole 7, and an air hole bellows 8.

In addition, the housing 2 closes the air hole 7 and is provided inside the housing 2 with a filter 11 that allows air to enter and exit from the housing 2, and as a measuring unit that measures the amount of movement of the spindle 3. And a protective partition 12 for protecting the scale 32 and the detection unit 6 by covering the scale 32 and the detection unit 6.
The protective partition 12 has a hole 12 A for inserting the spindle 3 and is fixed to the housing 2.
The filter 11 may be any filter as long as it allows air to enter and exit the housing 2 and does not allow oil mist, dust, water droplets, and the like to enter and exit the housing 2. For example, Gore-Tex (registered trademark) Etc. can be adopted.

Also in such a present embodiment, in addition to the same action and effect as the first embodiment, the following action and effect can be obtained.
(6) Since the linear gauge 1C includes the filter 11 that closes the air hole 7 and allows air to enter and exit the housing 2, it prevents oil mist, dust, water droplets, etc. from entering the housing 2. can do.
(7) The linear gauge 1C is provided inside the housing 2 and includes the protective partition 12 that protects the measuring means by covering the measuring means, and therefore adversely affects the measuring means such as oil mist, dust, and water droplets. Can be prevented.

[Modification of the embodiment]
The present invention is not limited to the above-described embodiments, and modifications, improvements, and the like as long as the object of the present invention can be achieved are included in the present invention.
For example, in each of the above embodiments, the linear gauges 1 to 1C have been exemplified as the measuring device, but the present invention may be applied to other measuring devices such as an indicator. In short, the present invention can be applied to a measuring device provided with a spindle, a housing, and an insertion hole bellows.
In each of the above embodiments, the air hole bellows 8 and the diaphragm 10 have been described as the pressure adjusting means, but other members may be adopted. In short, the pressure adjusting means may be any one that can adjust the pressure by changing the internal volume of the housing by changing its shape.

  As mentioned above, the present invention can be suitably used for a measuring instrument provided with a spindle that moves along its own axial direction.

1 to 1 C linear gauge (measuring device)
Reference Signs List 2 housing 3 spindle 4 insertion hole bellows 5 spindle holding portion 6 detection portion (measuring means)
7 Air hole 8 Air hole bellows 9 Connecting member 10 Diaphragm 11 Filter 12 Protective partition 31 Probe 44 Scale (Measure means)
51 Guide member

Claims (3)

A spindle that moves along its own axial direction, a housing having an insertion hole for inserting the spindle, and an insertion hole bellows that covers the spindle and the housing by being attached so as to straddle the spindle and the housing. A measuring instrument equipped with
The housing is
An air hole that communicates with the outside and allows air to enter and exit the inside of the housing;
The air hole is provided in the case so as to close the air hole, and the pressure adjusting means is provided to change the volume inside the case to adjust the pressure by changing its own shape .
The pressure adjusting means is an air hole bellows,
The spindle and with connecting the air hole bellows, measuring instrument, characterized in Rukoto with a connection member for stretching the air hole bellows in accordance with the movement of the spindle. In the measuring device according to claim 1 ,
A filter for closing the air hole and allowing air to enter and exit from the inside of the housing.
The measuring device is characterized in that the pressure adjusting means is provided inside the housing. The measuring device according to claim 1 or 2
Measuring means provided inside the housing and measuring the amount of movement of the spindle;
A measuring instrument comprising a protective partition which is provided inside the housing and which protects the measuring means by covering the measuring means.

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