JP2004354191A - Bush, measuring instrument, manufacturing method of measuring instrument, and cleaning method of measuring instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bush capable of precisely supporting a spindle and improving the manufacturing efficiency. <P>SOLUTION: The bush is adapted to be interposed between a cylindrical stem 3 and a spindle provided to be protrudable and retreatable within the stem to support the spindle so as to be slidable in the protruding and retreating direction A of the spindle. A V-groove 71 as a communicating passage in which the air nipped by the stem 3 and the push 7 can reciprocate from one side of the protruding and retreating direction A of the spindle 4 to the other side thereof is provided on the circumferential surface of the bush. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bush, a measuring device, a method of manufacturing the measuring device, and a method of cleaning the measuring device.
[0002]
[Background Art]
A dial gauge 1 shown in FIG. 4 is known as a measuring device for measuring dimensions and the like of an object to be measured (for example, Patent Document 1), and a waterproof dial gauge 1 is also known. The dial gauge 1 includes a main body 2, a cylindrical stem 3 provided on the main body 2, and a spindle having a probe that is provided in the stem 3 so as to be able to advance and retreat in the axial direction and abuts on a tip at the tip of the probe. 4, a bush 5 provided in the stem 3 for bearing the spindle 4, and display means 6 provided on the surface of the main body 2 to indicate the amount of axial displacement of the spindle 4 with the hands 61.
The main body 2 has a waterproof and hermetic structure, and inside the main body 2 is provided a movement amount conversion mechanism for expanding the movement amount of the spindle 4 and converting the movement amount to the rotational movement of the pointer 61 of the display means 6 (not shown). Illustrated). As such a moving amount conversion mechanism, a mechanism provided with a rack provided on the spindle 4, a pinion that meshes with the rack, and a gear train that transmits the rotation of the pinion toward the pointer 61 can be cited.
The bush 5 is press-fitted into the stem 3 and fixed on the outer peripheral surface, and bears the spindle 4 on the inner peripheral surface. As shown in FIGS. 5 (A) and 5 (B), a V-groove 51 is formed on the inner periphery of the bush 5 to allow air to flow between the main body 2 and the outside when the spindle 4 moves. . The V-shaped groove 51 is formed on the inner peripheral surface of the bush 5 along the axial direction of the spindle 4. The V-shaped groove 51 is formed after the bush 5 is pressed into the stem 3.
[0003]
According to such a configuration, the amount of displacement of the spindle 4 is displayed on the display means 6, so that measured values such as dimensions of the object to be measured can be obtained. When the spindle 4 moves, air moves through the V-groove 51 between the bush 5 and the spindle 4, and air flows into the main body 2 according to the movement of the spindle 4, or from the inside of the main body 2. Air flows out.
[0004]
[Patent Document 1]
JP 2001-264003 A
[Problems to be solved by the invention]
However, when the V-groove 51 is formed on the inner periphery of the bush 5 serving as a bearing, burrs (burrs) are generated on the inner periphery of the bush 5 due to the V-groove processing. Then, there is a problem that burrs affect the sliding of the spindle 4 and hinder smooth movement of the spindle 4. If the movement of the spindle 4 is hindered, there arises a problem that the measurement accuracy deteriorates.
In addition, since the V-groove 51 is formed on the inner periphery of the bush 5, machining to the inner diameter of the bush 5 is required, and there is a problem that machining cost increases.
In the case where secondary processing of performing V-groove processing after press-fitting the bush 5 into the stem 3 is performed, a problem arises in that a manufacturing procedure becomes complicated and a manufacturing cost increases.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a bush, a measuring instrument, and a method for manufacturing the measuring instrument, which can precisely spindle the spindle and improve the production efficiency, and which is simple and reliable for cleaning the measuring instrument. Is to try to provide a way.
[0007]
[Means for Solving the Problems]
The bush according to claim 1, wherein the bush is interposed between a cylindrical stem and a spindle provided in the stem so as to be able to advance and retreat, and the bearing is slidable in the advancing and retreating direction. A communication passage is provided on an outer peripheral surface of the spindle so that air interposed between the bush and the bush can reciprocate from one side to the other side in the reciprocating direction of the spindle.
[0008]
According to such a configuration, an air flow is formed through the communication passage in the direction in which the spindle moves. For example, even when the stem is attached to the main body of the hermetically sealed structure, air is injected into the main body through the communication passage or discharged from the main body in accordance with advance and retreat of the spindle.
Since the communication passage is formed on the outer peripheral surface of the bush, there is no need to perform any processing on the inner peripheral surface for bearing the spindle. Therefore, burrs do not occur on the bearing surface of the bush, and the spindle can be precisely bearing.
Since the communication path is formed on the outer peripheral surface of the bush, the communication path can be formed much easier than processing the inner diameter of the bush. Therefore, the manufacturing process can be simplified and the manufacturing efficiency can be improved. In addition, since the bush can be attached to the stem after forming the shape of the bush including the communication path, it is not necessary to perform secondary processing such as machining the stem after attaching the bush to the stem. Therefore, by streamlining the production line, the production efficiency can be improved.
[0009]
A bush according to a second aspect is characterized in that, in the bush according to the first aspect, the communication path is a groove formed on the outer peripheral surface along a direction in which the spindle advances and retreats.
According to such a configuration, processing is easy because only a groove is formed on the outer peripheral surface of the bush, and manufacturing efficiency can be improved.
[0010]
4. The bush according to claim 3, wherein the bush is interposed between a cylindrical stem and a spindle provided in the stem so as to advance and retreat, and the bearing supports the spindle so as to slide in the advance and retreat directions. A fixed portion fixed to the inner wall and having a spindle-side space at a predetermined interval between the spindle and the spindle, and a stem-side space at a predetermined interval between the inner wall of the stem and slidably bearing the spindle. And a communication hole that communicates the spindle-side space and the stem-side space.
[0011]
According to such a configuration, the bush is fixed in the stem by the fixing portion, and the spindle is supported by the bearing portion. Then, gas in the spindle side space flows through the communication hole into the stem side space, and gas in the stem side space flows through the communication hole into the spindle side space. Since the air flow path can be formed in the stem, for example, even when the stem is attached to the main body having a closed structure, air flows into the main body in accordance with the movement of the spindle, or air flows from the main body. Is discharged.
No processing such as forming a groove on the bearing surface of the spindle of the bearing portion to obtain the air flow path is required. Therefore, the accuracy of bearing the spindle can be improved by smoothing the bearing surface of the bearing portion.
Since the bush can be attached to the stem after forming the shape of the bush including the communication hole, there is no need to perform secondary processing such as forming a groove in the bush after attaching the bush to the stem. Therefore, by streamlining the production line, the production efficiency can be improved.
[0012]
The bush according to claim 4 is the bush according to claim 3, wherein the fixed portion and the bearing portion are provided between the fixed portion and the bearing portion provided at a predetermined distance in the advance / retreat direction of the spindle. And a connecting portion connecting the connecting portion, and the communication hole is formed to penetrate the connecting portion.
[0013]
According to such a configuration, it is only necessary to drill a communication hole in the connecting portion, so that it is simple. For example, if a connecting portion is provided as a connecting portion between the fixed portion and the bearing portion and the stem and the spindle are separated by a predetermined distance, and the stem side and the spindle side of this connecting portion are penetrated by the communication hole. The spindle side space and the stem side space can be communicated. Since it is not necessary to machine the inner diameter of the bush, the machining process can be simplified, and the manufacturing cost can be reduced.
[0014]
The measuring device according to claim 5, wherein the measuring device according to claim 1 or 2, further comprising: a cylindrical stem; It is characterized by comprising a bush and display means for displaying the amount of advance and retreat of the spindle.
[0015]
According to such a configuration, it is possible to provide a measuring instrument having the same operation and effect as the invention described in claim 1 or 2. Furthermore, by using a common bush for all the measuring devices as well as the measuring device having the closed structure, the manufacturing efficiency can be increased and the manufacturing cost can be reduced. In the case of measuring instruments other than those with a closed structure, processing such as communication passages is not necessary in the bush.However, by sharing the parts of all measuring instruments, the number of parts can be reduced as a whole and the manufacturing line can be simplified. it can. Forming a groove or the like on the outer peripheral surface of the bush is much easier than digging a groove in the bush inner diameter by secondary processing as in the past, so the effect on the manufacturing cost is small, As a result, the manufacturing cost of all the measuring instruments can be reduced by sharing parts and streamlining the manufacturing line.
[0016]
The measuring instrument according to claim 6, wherein the measuring instrument according to claim 3 or 4 is a cylindrical stem, a spindle provided so as to be able to advance and retreat in the stem, and having a measuring element at a tip abutting on the object to be measured. It is characterized by comprising a bush and display means for displaying the amount of advance and retreat of the spindle.
According to such a configuration, it is possible to provide a measuring instrument having the same operation and effect as the invention of claim 3 or 4. Furthermore, by using a common bush for all the measuring devices as well as the measuring device having the closed structure, the manufacturing efficiency can be increased and the manufacturing cost can be reduced. The production cost of all measuring instruments can be reduced by sharing parts and streamlining the production line.
[0017]
A method of manufacturing a measuring instrument according to claim 7, which is a method of manufacturing the measuring instrument according to claim 5, wherein the bush is attached to the stem after the communication path is formed in the bush. It is characterized by the following.
According to such a configuration, the bush is attached to the stem after the communication passage, for example, the V-groove is formed in the bush. This eliminates the need for secondary processing such as processing the bush after attaching the bush to the stem. Therefore, by making the manufacturing process into a streamline, the manufacturing process can be simplified, and the manufacturing efficiency can be improved.
[0018]
A method of manufacturing a measuring instrument according to claim 8 is the method of manufacturing a measuring instrument according to claim 6, wherein the bush is attached to the stem after forming the communication hole in the bush. It is characterized by the following.
According to such a configuration, it is not necessary to perform secondary processing of processing the bush after attaching the bush to the stem, so that a streamlining of the manufacturing process can be realized and the manufacturing efficiency can be improved.
[0019]
A method for cleaning a measuring device according to claim 9 is a method for cleaning a measuring device for cleaning a measuring device according to claim 6, wherein the cleaning liquid passes through the spindle-side space, the stem-side space, and the communication hole. Is injected or discharged. That is, a cleaning liquid injection step of injecting a cleaning liquid into the stem through the spindle side space, the stem side space and the communication hole, and a cleaning liquid through the spindle side space, the stem side space and the communication hole. A cleaning liquid discharging step of discharging the cleaning liquid from the inside of the stem.
According to such a configuration, the cleaning liquid can be injected into the stem, and the cleaning liquid can be discharged from the stem. That is, since the spindle-side space and the stem-side space communicate with each other through the communication hole, a flow path of the cleaning liquid is secured, and the inside of the stem can be easily cleaned by injecting and discharging the cleaning liquid. At this time, since the flow of the cleaning liquid is formed, the cleaning is performed reliably. Further, since the cleaning liquid hardly remains in the spindle-side space or the stem-side space, corrosion due to the remaining liquid or the like can be prevented.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(1st Embodiment)
FIG. 1 shows a dial gauge 1 as an embodiment of the bush of the present invention and a measuring instrument provided with the bush.
The basic configuration of the dial gauge 1 is the same as that of the dial gauge 1 described in the background art, but is characterized by the structure of the bush. In FIG. 1, portions denoted by the same reference numerals as those of the background art (FIGS. 4 and 5) represent the same components.
The bush 7 has a V-shaped groove (groove) 71 as a communication passage for allowing air to flow between the stem 3 and the cylindrical outer peripheral surface 72.
The bush 7 is press-fitted from the tip of the stem 3, and the outer peripheral surface 72 of the bush 7 is fixed to the inner wall 31 of the stem 3. The outer diameter of the bush 7 is substantially the same as the inner diameter of the stem 3, and the outer periphery of the bush 7 is formed in a circular shape in accordance with the inner periphery of the stem 3 being circular.
The inner diameter of the bush 7 is substantially the same as the outer diameter of the spindle 4, and the spindle 4 is supported on the inner peripheral surface 73 of the bush 7 so as to be able to advance and retreat in the axial direction (dashed line A in FIG. 1).
The V-groove 71 is formed in the outer peripheral surface 72 of the bush 7 by cutting out a V-shaped cross section from one end to the other end of the bush 7 along the advance / retreat direction A of the spindle 4. The V-groove 71 is provided in two rows, and is provided on both sides in the diameter direction of the bush 7.
[0021]
The shape of the groove as the communication passage is not limited to the V-shape, and may be, for example, a U-shape or a groove having a flat bottom surface. However, in the case of the V-shape, the processing is easy and the manufacturing cost can be reduced. Further, the number of grooves may be two or three. The groove is not limited to a straight line, but may be a curved line such as a spiral.
The V groove 71 is formed at the same time when the shape of the bush 7 is formed. Then, after the shape of the bush 7 including the V-shaped groove 71 is formed, the bush 7 is pressed into the stem 3.
[0022]
The operation of the first embodiment will be described.
The spindle 4 is moved back and forth in the axial direction A. For example, when the spindle 4 is pulled out from the main body 2, air flows into the main body 2 through the V groove between the stem 3 and the bush 7. When the spindle 4 is pushed toward the main body 2, the air in the main body 2 is pushed out of the main body 2 through the V-groove 71 to the outside.
[0023]
According to the first embodiment, the following effects can be obtained.
(1) Since the V-groove 71 is outside the bush 7, no burr is generated on the inner peripheral surface 73 for bearing the spindle 4. Therefore, the spindle 4 can slide smoothly by the bearing of the bush 7. As a result, the measurement accuracy of the dial gauge 1 is improved.
[0024]
(2) Since the V-shaped groove 71 is formed on the outer peripheral surface 72 of the bush 7, the processing of the V-shaped groove 71 is very simple. Since the processing is simpler than in the case of processing the inner diameter of the bush 7 as in the related art, the processing cost can be reduced.
[0025]
(3) Since the bush 7 including the V-shaped groove 71 is press-fitted into the stem 3, there is no need for secondary processing after press-fitting. As a result, the manufacturing process is streamed, the manufacturing efficiency is improved, and as a result, the manufacturing cost can be reduced.
[0026]
(4) Not only the waterproof type dial gauge 1 but also the bush 7 of all dial gauges 1 can be used in common. If the dial gauge 1 is not a waterproof type, it is not necessary to have the V-groove 71. However, since it is easy to form the V-groove 71 on the outer periphery of the bush 7, the bush 7 having the V-groove 71 is not necessary. Even if used, the effect of increasing the processing cost is small. Then, by sharing parts between the waterproof type and the non-waterproof type, the number of parts can be reduced as a whole and the manufacturing line can be simplified. As a result, the manufacturing cost of all dial gauges 1 can be reduced.
[0027]
(2nd Embodiment)
A second embodiment of the bush of the present invention and a measuring instrument provided with the bush will be described with reference to FIG. The basic configuration of the second embodiment is similar to the configuration described in the background art (FIGS. 4 and 5), but is characterized by the configuration of the bush.
The bush 8 is fixed between an inner wall of the stem 3 and a fixed portion 81 having a spindle-side space 811 at a predetermined interval between the bush 8 and the spindle 4. A bearing portion 82 having a stem space 821 at a predetermined interval, a connecting portion 83 connecting the fixed portion 81 and the bearing portion 82, and a communication hole 84 communicating the spindle space 811 and the stem space 821. Have.
[0028]
The bush 8 has a substantially cylindrical shape as a whole, and is press-fitted from the tip of the stem 3. The bush 8 has a fixed portion 81, a connecting portion 83, and a bearing portion 82 in order from one end to the other end along the advance / retreat direction A of the spindle 4, and is pressed into the stem 3 from the fixed portion 81.
The fixing portion 81 has a cylindrical shape and an outer diameter substantially equal to the inner diameter of the stem 3. When the bush 8 is pressed into the stem 3, the outer peripheral surface of the fixing portion 81 is fixed to the inner wall of the stem 3. The inner diameter of the fixed portion 81 is slightly larger than the outer diameter of the spindle 4, and a predetermined space is formed between the fixed portion 81 and the spindle 4 to form a spindle-side space 811.
[0029]
The bearing portion 82 has a cylindrical shape and an inner diameter substantially equal to the outer diameter of the spindle 4. The spindle 4 is supported by the inner peripheral surface of the bearing 82.
The outer diameter of the bearing portion 82 is slightly smaller than the inner diameter of the stem 3, and a predetermined space is formed between the bearing portion 82 and the inner peripheral surface of the stem 3 to form a stem-side space 821.
The connecting portion 83 is provided between the fixed portion 81 and the bearing portion 82 and connects the other end of the fixed portion 81 to one end of the bearing portion 82. The connecting portion 83 has a cylindrical shape, and the inner diameter is larger than the outer diameter of the spindle 4, and the outer diameter is smaller than the inner diameter of the stem 3. That is, the connecting portion 83 has a predetermined interval between the stem 3 and the spindle 4.
[0030]
The communication hole 84 communicates the outer periphery and the inner periphery of the connecting portion 83. The communication hole 84 is formed by cutting out a part of the fixing part 81 and penetrating through the connecting part 83 at a boundary between the fixing part 81 and the connecting part 83.
In the bush 8, a fixed portion 81, a connecting portion 83, and a bearing portion 82 are integrally formed continuously and integrally. The bush 8 is press-fitted into the stem 3 from the fixing part 81 after the shape including the communication hole 84 is formed.
[0031]
The operation of the second embodiment will be described.
The spindle 4 is moved back and forth in the axial direction A. For example, when pulling out the spindle 4 from the main body 2, air flows into the main body 2. At this time, air flows from the stem side space 821 between the stem 3 and the bearing portion 82 to the outer peripheral side of the connecting portion 83. Air flows from the outer peripheral side of the connecting portion 83 through the communication hole 84 to the spindle side space 811 between the fixed portion 81 and the spindle 4, and flows into the main body 2.
When the spindle 4 is pushed toward the main body 2, the air in the main body 2 is pushed out. At this time, air escapes from the spindle side space 811 to the stem side space 821 through the communication hole 84.
[0032]
According to the second embodiment, the same effects as those of the first embodiment (1) to (4) can be obtained.
Further, when the bush 8 of the present embodiment is used in common for all the dial gauges 1, the cleaning liquid can be injected into the dial gauge 1 and the cleaning liquid can be discharged from the dial gauge 1. That is, as shown in FIG. 3, the cleaning liquid can be injected and discharged along the same path as the air flows in and out (arrow B in FIG. 3).
Here, when there is no communication hole 84, there is no escape space for air from the stem side space 821, so it is difficult to inject the detergent liquid into the stem side space 821, and the cleaning liquid flowing into the stem side space 821. Is difficult to discharge. However, since the communication hole 84 is provided and the communication hole 84 is connected to the spindle-side space 811, the cleaning liquid can flow, and the dial gauge 1 can be effectively cleaned.
[0033]
The bush, the measuring device, the method of manufacturing the measuring device, and the method of cleaning the measuring device of the present invention are not limited to the above embodiment, and various changes can be made without departing from the gist of the present invention. Of course.
The measuring device is not limited to the dial gauge 1 as a measuring device of the hand tool, but may be a micrometer, a micrometer head, or the like. In short, any measuring device having a bush that slidably supports the spindle 4 may be used. Alternatively, a machine tool provided with a bush that slidably supports a spindle 4 having a cutting tool (blade) at the tip may be used.
[0034]
Although the bushes 7 and 8 have been described as being cylindrical, the cross-sectional shape is not limited to a circle, and may be polygonal according to the shape of the spindle 4 or the stem 3. That is, if the cross-sectional shape of the inner periphery of the stem 3 is a polygon, the outer periphery of the bushes 7 and 8 is formed into a polygon that matches the inner periphery of the stem 3. If the sectional shape of the spindle 4 is polygonal, the bearing surfaces of the bushes 7 and 8 are also made polygonal according to the outer shape of the spindle 4.
[0035]
In the second embodiment, the connection portion 83 is provided between the fixing portion 81 and the bearing portion 82, and the communication hole 84 is formed through the connection portion 83. However, the connection portion 83 is not always necessary. Instead, the fixing portion 81 and the bearing portion 82 may be directly connected. The communication hole 84 may be formed in the bushes 7 and 8 so as to communicate the spindle side space 811 and the stem side space 821.
Although the bushes 7 and 8 are press-fitted into the stem 3 from the fixing portion 81, they may be press-fitted into the stem 3 from the bearing portion 82.
[0036]
【The invention's effect】
As described above, according to the bush, the measuring device, and the method of manufacturing the measuring device of the present invention, the spindle can be precisely bearing, the manufacturing efficiency can be improved, and the measuring device of the present invention can be cleaned. According to the method, an excellent effect that the measuring instrument can be easily and reliably washed can be obtained.
[Brief description of the drawings]
FIG. 1A is a sectional view of a main part of a first embodiment according to a measuring instrument of the present invention. (B) is a sectional view taken along the line II in (A).
FIG. 2A is a cross-sectional view of a main part of a second embodiment according to the measuring instrument of the present invention. (B) is a sectional view taken along line II-II in (A).
FIG. 3 is a view showing a flow path of a cleaning liquid in the method for cleaning a measuring instrument according to the present invention.
FIG. 4 is a diagram showing a conventional measuring instrument.
FIG. 5 is a view showing a structure of a bush in a conventional measuring instrument.
[Explanation of symbols]
1: Dial gauge (measuring instrument)
3 Stem 4 Spindles 5, 7, 8 Bush 6 Display means 71 V-groove (communication passage, groove)
81: fixed part 82 ... bearing part 83 ... connecting part 84 ... communication hole 811 ... spindle side space 821 ... stem side space

Claims (9)

In a bush that is interposed between a cylindrical stem and a spindle provided to be able to advance and retreat in the stem and that slidably supports the spindle in the advance and retreat directions,
A bush, wherein a communication passage through which air sandwiched between the stem and the bush can reciprocate from one side to the other side in the advance / retreat direction of the spindle is provided on an outer peripheral surface. The bush according to claim 1,
The bush, wherein the communication passage is a groove formed on the outer peripheral surface along a direction in which the spindle advances and retreats. In a bush that is interposed between a cylindrical stem and a spindle provided to be able to advance and retreat in the stem and that slidably supports the spindle in the advance and retreat directions,
A fixing portion fixed to the inner wall of the stem and having a spindle-side space at a predetermined interval between the spindle and the spindle;
A bearing portion that slidably bears the spindle and has a stem-side space with a predetermined interval between the inner wall of the stem and
A bush, comprising: a communication hole communicating the spindle-side space and the stem-side space. The bush according to claim 3,
A connecting portion that connects the fixed portion and the bearing portion between the fixed portion and the bearing portion provided at a predetermined distance in the advance and retreat direction of the spindle,
The bush, wherein the communication hole is formed to penetrate the connecting portion. A cylindrical stem, a spindle having a tracing stylus which is provided to be able to advance and retreat within the stem and which abuts on the tip at the tip;
A bush according to claim 1 or 2,
Display means for displaying an amount of advance or retreat of the spindle. A cylindrical stem, a spindle having a tracing stylus which is provided to be able to advance and retreat within the stem and which abuts on the tip at the tip;
A bush according to claim 3 or claim 4,
Display means for displaying an amount of advance or retreat of the spindle. It is a manufacturing method of the measuring device which manufactures the measuring device of Claim 5, Comprising:
A method for manufacturing a measuring instrument, comprising: after forming the communication passage in the bush, press-fitting the bush into the stem. A method for manufacturing a measuring device for manufacturing the measuring device according to claim 6,
A method for manufacturing a measuring instrument, comprising: after forming the communication hole in the bush, press-fitting the bush into the stem. A method for cleaning a measuring device for cleaning a measuring device according to claim 6,
A cleaning method for a measuring instrument, wherein a cleaning liquid is injected or discharged through the spindle-side space, the stem-side space, and the communication hole.

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