JPS595901A - Displacement measuring device - Google Patents

Abstract

PURPOSE:To perform highly accurate measurement by a simple constitution by providing a cam which is operated in association with a movable member that can be displaced, a rotary body, a coupled device, and a display device in the main body of a case. CONSTITUTION:A spindle 5, which is a movable member, is supported at a position in an inner frame 1 of a case body through a stem 4 so that the axial direction of the spindle 5 can be displaced. A contact probe 5A is supported at the tip and a contact roller 8 is supported at a base end so that they are freely rotated. A cam 9 is always contacted with the roller 8 by a hair spring 13. When the spindle 5 is displaced, the cam 9 is rotated in proportion to the amount of displacement, and the movement is transmitted to a rotary roller 20. The rotation of the roller 20 is expanded and transmitted to a coupled roller 21, which is frictionally contacted with the roller 20. A pointer 29 which is fixed to a rotary shaft 22 indicates a scale 30A which is attached to a scale plate 30. Thus, the dispersion in measured values due to backlash can be eliminated inexpensively without using many parts such as expensive pinions.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a displacement measuring machine, and more particularly, the present invention relates to a displacement measuring machine, and more particularly to a displacement measuring machine in which a display device displays the amount of displacement of a movable member whose one end side is in contact with an object to be measured. The present invention relates to an improvement in a structure for transmitting the displacement of a member to the display device.

Conventionally, for example, in a displacement measuring device such as a dial dage, a rack is provided on the spindle, which is an i1 moving member, and an enlargement mechanism or a transmission mechanism consisting of a combination of a gear group or a sector gear meshed with this rack is used. The linear motion of the spindle is enlarged and converted into a full rotational motion, and the enlarged rotational angle is displayed as the amount of displacement of the spindle using a pointer and a dial scale.

However, this type of expansion mechanism or transmission mechanism requires many sophisticated and expensive parts such as racks, pinions, sector gears, etc., and the large number of components makes assembly difficult and requires a lot of skill to make adjustments. It also has the drawback that it is difficult to completely eliminate back cracks. For this reason, the display accuracy of dial digits and the like is limited to "A 00 =" and is expensive.

The present invention aims to develop a transmission mechanism or an enlargement mechanism that eliminates the above-mentioned drawbacks, and to provide a highly accurate and inexpensive displacement measuring device such as a dialage. In addition to introducing a means for converting the cam into a cam, a rotating body integrally connected to the cam and a follower that engages with the rotating body constitute a transmission and expansion mechanism.

In other words, according to experiments, the base circle (major axis) of the cam is 11
When the short axis equivalent to 360 degrees from the long axis point is rl,
tanθ-Lko1 and [7 and the value of θ is 1 degree or more and 2π
It has been found that if r is used, the linear motion of the spindle can be converted into the rotational motion of the cam within a range that does not cause any practical problems, and that if it is set to 2 degrees, the motion will be extremely smooth [7].

On the other hand, in a displacement measuring device such as a dial gauge, it is practically difficult to set the base circle r of the cam to 50 m or more due to its construction, and it is generally desirable to set it to 10 to 20 U. Here, if the basic circle r is 10 degrees and the value of θ of tanθ-ri2 is 2 degrees, then r12πr = 7. gii, and in this case, the stroke of the spindle is restricted to approximately 22 h.

(2) In order to ensure display accuracy of 171,000 mm and obtain the required spindle stroke, the present invention provides a means for converting simple linear motion into rotational motion without causing back cracks, by converting rotations within one rotation. A cam that is allowed to move, a rotating body that is integrally connected to the cam and rotates synchronously as a means for transmitting and amplifying this rotational motion, and a rotating body that engages with this and drives a display device. A transmission amplification mechanism tm is constructed as a combination of a follower and a follower of the invention.

The present invention includes a case body, a ringing member whose one end can come into contact with an object to be measured and is displaceably attached to the case body, and a ringing member that is engaged with the movable member within the case body and rotates by displacement of the movable member. A cam that is moved, a rotating body that rotates in synchronization with this cam, a follower that is engaged with this rotating body and rotates, and the amount of displacement of the moving member due to the rotation of this follower. The object is achieved by providing a display device for displaying the changed position of the movable member via the rotating body and the follower.

Embodiments of the present invention will be described below based on all the drawings.

FIGS. 1 and 2 show the overall configuration of an embodiment in which a displacement measuring device according to the present invention is applied to a dial gauge. In these figures, a short cylindrical inner frame 1
A disc-shaped layer 2 is attached to one side, and a ring-shaped outer frame 3 is fitted on the opposite side of the inner frame 1 from the back cover 2. A scale plate 30 is attached to this outer frame 3. and transparent cover 31 are identified. Here, the inner frame 1, the back cover 2,
and the outer frame 3 constitute a case body.

A spindle 5 as a movable member is supported at a predetermined position of the inner frame 1 via a stem 4 so as to be movable in the axial direction.

A contactor 5A is provided at the tip of the spindle 5,
In this contactor 5A, the spindle 5 is brought into contact with the object to be measured. The spindle 5 is urged downward in the figure by a compression spring (not shown), and a bearing 6 having a rotation stopper groove 6At is provided in the stem 4. A rotation stopper bottle I that protrudes and whose tip side is inserted into the rotation stopper ##6A is embedded, and the spindle 5 is stopped from rotating by this pin 7 and the above @6A.0 Base end of the spindle 5 A contact roller 8 is rotatably supported by the contact roller 8, and a cam 9 can come into contact with the contact roller 8. The cam surface on the outer periphery of the cam 9 is formed in an Archimedean spiral shape, and the base circle (major axis) is rl and fc is the radius equivalent to 360 degrees from the major axis point r1.
The value of θ of θ−any r1 is 12 π r degrees or more, preferably 1. ＜ is formed twice or more,
For example, when r-10 and r1='7.6, then θ
-218 degrees, and at this time the stroke of the spindle 5 is 24 degrees. This cam 9 is fixed to a rotating shaft 10,
One end side of the rotating shaft 10 is connected to the back cover 2 through a bearing member 11.
The other end of the rotating shaft 10 is rotatably supported by a base plate 12 fixed to the inner frame 1 via a bearing 12A.

Further, one end side of a balance spring 13 is fixed to the rotating shaft 10, and the other end side of this balance spring 13 is fixed to the bearing member 11, so that the cam 9 is rotated counterclockwise in FIG. The biased cam 9 and the contact roller 8 are configured to always contact each other.

The center of a rotating body row 220 as a rotating body is fixed to the rotating shaft 10, so that the rotating body roller 20 and the cam 9 are always rotated synchronously via the rotating shaft 10. ing. A follower roller 21 as a follower is frictionally engaged with the outer peripheral surface of the co-moving body roller 20 . The outer peripheral surface of at least one of the rotating body roller 20 and the follower roller 21 is subjected to an anti-slip finish such as a matte finish or a rubber or soft resin coating, so that they roll into contact with each other without sliding friction. It looks like this. Further, the follower roller 21 is the rotating body roller 2
It is formed to have a smaller diameter at a predetermined ratio than zero, and when the rotating body roller 20 rotates once, the follower roller 21 rotates multiple times.

The follower roller 21 is integrally formed with the rotary shaft 22 at a predetermined position of the rotary shaft 22, and the rotary shaft 22 is arranged rotatably along the center axis of the inner frame 1.

This rotating shaft 22 is rotatably supported by a slip prevention suppressing member 24 via a bearing 23. This anti-slip suppressing member 24 has an advancing/retracting shaft 25 integrally formed to extend along the radial direction of the inner frame 1, and this advancing/retracting shaft 25 is connected via a holding member 26 to the above-mentioned Advance/retreat axis 2 on main plate 12
A compression coil spring 27 is installed between the 0 holding member 26 and the anti-slip suppressing member 24, which are supported so as to move forward and backward along the axial direction of the 5. The roller 21 is always in contact with the rotator roller 20.

Note that the anti-slip suppressing member 24 and the compression coil spring 2
7 constitutes a biasing means for frictionally engaging the follower roller 21 with the rotating body roller 20. One end side of the rotating shaft 22 has a center provided at the center of each of the main plate 12 and the scale plate 30. A pointer 2.9 is inserted into the holes 28 and 32' and projected toward the transparent cover 31 side by a predetermined length, and a pointer 2.9 is fixed to the tip. , is now used as an index. Here, a display device is constituted by the pointer 29 and the scale 30A.Next, the operation of this embodiment will be explained.

The cam 9 is always in contact with the contact roller 8 by the hairspring 13, and when the spindle 5 is displaced along the axial direction, the cam 9 is rotated in proportion to the displacement wrinkle, and this rotation is It is transmitted to the rotating body roller 20 via the shaft 10. The rotation of the rotary body roller 2o is magnified and transmitted to the follower roller 21 that comes into frictional contact with the rotary body roller 20, and as a result, the pointer 29 fixed to the rotary shaft 22 can be adjusted to the scale attached to the scale plate 3o. 30A will be the index.

This embodiment has the following effects.

No expensive parts such as racks or binions are used.
Therefore, the structure is simple, the number of parts can be reduced to less than the conventional one, and it can be provided at low cost and is easy to assemble. In addition, there is no risk of errors such as misalignment of the valley joints of the binions, and there is no variation in measured values due to back racking.
Therefore, there is no need for a back crack prevention mechanism, and from this point of view, the structure is simple.Also, since the structure is simple and no pinions are used, it can be made robust. Moreover, the friction of the cam surface of cam 9 has no effect on display accuracy lol
On the contrary, it has the full advantage of helping to facilitate conversion (transmission).

In addition, the pointer 29 is not directly connected to the cam 9,
Cam 9 via rotating body roller 20 and follower roller 21
The rotation of the spindle 5 is enlarged and transmitted to the pointer 29, and since the finger hook 29 can rotate multiple times, the stroke of the spindle 5 can be made longer and the accuracy of measurement by the pointer 29 can be improved. .

1. In the above embodiment, the rotating body is the rotating body roller 20, and the follower is the follower roller 21, but
As in the other embodiments shown in FIGS. 4 and 5, the rotating body is a rotating body gear 120, and a driven gear 121 as a follower is meshed with this rotating body gear 120. 120 and the follower gear 121, the cam 9
It may be configured such that the rotation of the needle is transmitted to the pointer 29. Here, the driven gear 121 is supported between the base plate 12 and the mounting plate 51, and
is fixed to the base plate 12 via a support 52 and a screw 53.

Further, in FIG. 4.5, a back push prevention gear 122 is rotatably inserted into the rotating shaft 10 at a position close to the rotating body gear 120. Rotating gear 1
20 and back push prevention gear 122 are provided with small windows 120A and 122A, respectively.
A spring member 123 is interposed between A and 122A, and this spring member 123 causes the back push prevention gear 1 to
22 is biased to be rotated in a predetermined direction with respect to the rotating body gear 120 around the rotating shaft 10. As a result, there is a gap between the tip of the back push prevention gear 122 and the gear of the rotating body gear 120. The tips of the teeth of the driven gear 121 are sandwiched between the teeth, thereby preventing back cracks when the rotating body gear 120 and the driven gear 121 are in mesh with each other.

In addition, in the above embodiment, the displacement measuring device according to the present invention was explained as being applied to a dial dage, but it is not limited to a dial dage, but can also be applied to other displacement measuring devices such as a micrometer, a hidedage, and a noyas. Alternatively, it can be a new displacement measuring device that is not classified into any conventional type. Also, the rotation of the cam 9 is controlled by the pointer 29.
The pointer 29 and the scale 30A constitute a display device, but the display device is not limited to a pointer type, but may be a dial number display type or a digital display type. , the rotating body roller 20, the rotating body gear 120, and the cam 9
are attached concentrically via the co-moving shaft 10 and are always rotated synchronously, but (b) the moving body roller 20 and the rotating body gear 120 are directly attached to the (b) moving shaft 10. Alternatively, the rotating body roller 20 and the rotating body gear 120 may be connected to the driven roller 21 and the driven gear 121 via an enlarging mechanism.
It may be engaged with.

Further, although the cam 9 is formed in an Archimedean spiral shape, it is not limited to the Archimedean spiral shape and may have other shapes. However, if it is an Archimedean spiral shape, the scale of the scale plate 30 30A can be made into a uniform scale.

Furthermore, although the contact roller 8 is attached to the spindle 5 as a movable member, the base end of the spindle 5 may directly contact the cam 9. However, if the cam 9 is brought into contact with the cam 9 via the contact roller 8, the cam 9 can be easily rotated smoothly.

Further, in the embodiment shown in FIGS. 4 and 5, a backlash prevention mechanism consisting of a backlash prevention gear 122 and a spring member 123 is provided, but the structure of the backlash prevention mechanism is similar to this. For example, one end of the balance spring is fixed to the central shaft 22, and the other end is fixed to the inner frame 1, thereby constantly biasing the rotating shaft 22t in a predetermined rotational direction. Good too.

As described above, according to the present invention, it is possible to provide a displacement measuring device that has a simple structure, does not use many expensive parts, and is highly accurate and inexpensive.

[Brief explanation of drawings]

FIG. 1 is a front view showing the overall configuration of an embodiment in which a displacement measuring device according to the present invention is applied to a dial gauge, FIG. 2 is a sectional view taken along the arrow n-us in FIG. 1, and FIG. m in figure 2
-m5, FIG. 4 is a cross-sectional view of essential parts in an embodiment other than the above-mentioned embodiment, and FIG. 5 is an enlarged front view showing the meshing portion of the gears in FIG. 4. 1...Inner frame, 2...Back cover, 3...Outer frame, 5...
Spindle as movable member, 5^°“contactor, 8
°°゛Contact roller, 9...cam, 10...-driving shaft,
20... - rotating body roller as a moving body, 21°... driven child roller as a follower, 22... co-rotating shaft, 24
...Slip prevention press-) material, 25...Advance/retreat axis, 27
...Compression coil spring, 2B...Pointer, 30...Scale plate, 30A...Scale, 120...Rotating body gear as a rotating body, 121°...Follower gear as a follower ,
122... Back push prevention gear, 123... Spring member. Agent Accountant Minoru Kinoshita

Claims (1)

[Scope of Claims] (1) A case body, a movable member whose one end side is capable of coming into contact with the object to be measured and which is displaceably attached to the case body, and a movable member (which is engaged with the movable member) within the case body. A cam that rotates due to the displacement of the movable member, a rotating body that rotates in synchronization with the cam, a follower that is engaged with the rotating body and rotates, and a rotation of the movable member due to the rotation of the follower. A displacement measuring device 0 characterized in that it has a display device that displays the amount of displacement. (8) In claim 2, the N moving body and the follower are rollers that can frictionally engage with each other, and the follower is placed on the (b) moving body side. A displacement measuring device characterized in that a biasing means is installed to bias the driven element and the rotating body into full frictional engagement. (4) In claim 2, the rotating body and the driven body A displacement measuring device characterized in that the gears are gears that mesh with each other and are provided with a back crack prevention means. (6) In claim 4, the back crack prevention means is provided with a back crack prevention means. a backrack prevention gear formed in the same shape as the rotational axis of the cam and movably attached to the rotational axis of the cam; a spring member that urges the backrack prevention gear by rotating in a predetermined direction so that the tooth tip of the follower is sandwiched between the tooth tip of the backmass prevention gear and the tooth tip of the rotating body; A displacement measuring device comprising: (6) In any one of claims 1 to 5, the cam, the rotating body, and the follower rotate in one rotation of the cam. A displacement measuring device characterized in that the follower is configured to make one rotation of 21 g or more. A displacement measuring device characterized by comprising a scale provided on the rotary axis of the follower and a pointer attached to the rotary shaft of the follower. (8) Claims 1 to 7 In any of the above, an abutting roller is rotatably provided on one end side of the -eiJ movable member, and the movable member and the cam are abutted and engaged via the abutting roller. Displacement measuring machine.