JPH0312243B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic display type measuring instrument with a built-in encoder.

[Background technology and its problems]

In contrast to mechanical scale reading measuring instruments, so-called electronic display measuring instruments, which have an encoder built into a dial gauge or the like and display measured values digitally or analogously, have become widely popular due to their superiority in high resolution and ease of reading. It's coming.

Conventionally, the structure of this type of electronic display type measuring instrument, as shown in Utility Model Application Publication No. 51-78755, is that a spindle with a measuring head is slidably mounted on the main body, and a A main scale is provided with a detector on either side, and a display circuit and display device connected to the detector are provided, as well as various buttons such as power, zero clear, hold, etc. on the surface where the display is mounted. This is the mode in which the

By the way, even in this electronic display type measuring instrument,
There is an increasing demand for a display part that can be rotated in the direction of a conventional mechanical scale reading type dial gauge. In response to this, for example,
You can also see proposals like No. 77406.

However, in the conventional rotating display type, for example, as shown in FIG. 7, a detector is mounted on the fixed member A.
Amplifier and waveform shaping circuit etc. _A1 and counter circuit
At the same time, the display drive circuit B ₁ , interface circuit B ₂ , control circuit B _{3 ,} etc. are attached to the member B that rotates with respect to the fixed member A, and both are connected to the flat cable C ₁ , Since the configuration was such that they were connected to each other using _C2, etc., the following problems arose. That is, depending on the type of measuring instrument or display mode, etc., the number of wires may be 50 or more, and therefore the flat cables C ₁ and C ₂ have a certain degree of rigidity. When member B is rotated relative to each other, tensile force, shearing force, return force, etc. are applied between each terminal, and wire breakage and terminal detachment are likely to occur. Then, because the signals handled were weak, it became difficult to operate normally even if there was a poor connection.

Moreover, the rotation angle is limited to around 180 degrees,
In addition, it required a large rotational force and could sometimes return due to the rigidity of the wiring.

Furthermore, as the number of wires increases, the arrangement of components within the measuring instrument is restricted, resulting in an increase in size.

Moreover, contact with the spindle, scale, etc. inserted into the internal space occurs, which impedes the free sliding of the spindle or causes peeling of the wiring coating layer.

The positional relationship between the flat cables C ₁ and C ₂ and the electrical components must be kept in a specified manner in a narrow space.
It was difficult to disassemble and assemble.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic display type measuring instrument that can solve the above-mentioned problems.

[Means and actions for solving problems]

Therefore, in the present invention, the above-mentioned problem is solved by forming the band-shaped wiring into an arc shape with a constant curvature, inverting this in the middle, and fixing both ends to the main body and a frame that rotates with respect to the main body. This is the solution.

Specifically, a main body that slidably supports a spindle and includes an encoder for detecting the amount of axial displacement of the spindle, and a main body that is rotatably attached to this main body and is based on the amount of displacement detected by the encoder. A frame body provided with a display electrical component for displaying measured values, a belt-shaped wiring having an arc shape of a constant curvature is reversed midway, and one end side of this belt-shaped wiring is connected to the frame body. It is fixed to the inner end surface on the virtual circular trajectory of the main body centered on the rotation axis, and
The other end is fixed to the inner end surface on the virtual circular locus of the frame that is concentric with the circular locus and corresponds to the circular locus, the encoder is connected to the one end side, and the display electric component is connected to the other end side. The present invention is characterized in that it is configured such that the encoder and the display electrical equipment are connected to each other.

〔Example〕

Figure 1 shows the front of the dial gauge of this example.
FIG. 2 shows a cross section taken along the line -- in FIG. 1, respectively. In these figures, a case 1 includes a cylindrical main body 2 with an open end, and a cylindrical frame 3 rotatably attached to one end of the main body 2.
It is composed of. However, the main body 2 of the frame 3
The rotation angle is determined by an L-shaped stopper 15 provided at an upper position on the outer peripheral surface of the main body 2, and an L-shaped stopper 15 provided protruding from a predetermined position on the outer circumference of the frame 3, which comes into contact with the stopper 15 when the frame 3 rotates. The angle is restricted to one rotation or less, that is, 360 degrees or less, by an angle restriction means 17 consisting of a pin 16.

A dial gauge support collar 4 is integrally formed on the main body 2 at approximately the center of the other end surface, and a spindle protection cylinder 6 is connected to the upper part of the outer peripheral wall via a connecting member 5.
However, the stems 7 are attached to the lower part of the outer peripheral wall so as to be coaxial with each other and along an axis passing through the center of the main body 2. A spindle 8 whose upper end head portion 8A is slidably fitted into the spindle protection cylinder 6 is slidably inserted into the stem 7. The spindle 8 is provided with a measuring element 9 at its lower end protruding from below the stem 7, and has a scale mounting base 10 and a spring locking pin 11 located approximately at the center within the main body 2.
are installed respectively. A tension spring 12 is tensioned between the spring locking pin 11 and the inner circumferential wall of the main body 2, and serves to bias the spindle 8 downward in the figure and also to restrict rotation of the spindle 8. Further, a main scale 13 is attached to the scale mount 10 in parallel to the axis of the spindle 8.

On the other hand, on the front side of the frame 3, there is a digital display 21 in the center that digitally displays a measured value based on the amount of movement of the spindle 8, a +/- changeover switch 22 and an inch/mm changeover switch 2 in the upper part.
3. Maximum/minimum selector switch 24, preset switch 25, and power ON/OFF switch 26
However, a hold switch 27, a zero clear switch 28, etc. are provided at the bottom. Further, inside the frame 3, a board 29 is provided with a display electrical component 30 for displaying a measured value based on the amount of displacement of the spindle 8 on the digital display 21.
is fixed. A guide surface 29A is formed on the substrate 29 and includes a ring-shaped end surface formed along a virtual circular locus centered on the rotation axis of the frame 3. Note that the rotational axis of the frame 3 herein refers to a V groove formed on the outer circumferential surface of the main body 2 and a V groove formed on the inner circumferential surface of the frame 3, which is rotatable via an O-ring in the V groove. This is determined by the rotation mechanism consisting of the groove that fits into the groove, and may not coincide with the center of the main body 2 and/or the frame 3. The display electrical components 30 connected to the board 29 include a drive circuit for driving the digital display 21, an interface circuit for the various switches, a control circuit, and the like.

Further, a stepped circumferential edge 31 having a diameter in the axial direction of the spindle 8 is formed on the inner circumferential wall of one end surface of the main body 2, and this circumferential edge 31 has a holding member 3.
2 is fixed with several screws. As shown in FIG. 3, the holding member 32 has a notch 3 approximately in the center.
4 is formed, and a holder 36 is held at the position of the notch 34 via a leaf spring 35 parallel to the optical grating plane of the main scale 13. The holder 36 is provided with an index scale 37 and a light receiver 38 at positions facing the optical grating surface of the main scale 13, and pieces for sliding on the main scale 13 on both sides of the index scale 37. 39 is formed.

Note that an optical grating corresponding to the optical grating of the main scale 13 is also formed on the index scale 37. Further, the holder 36 is constantly biased in the direction in which the piece 39 comes into contact with the main scale 13 by a cantilever spring 40 whose one end is fixed to the holding member 32 . Further, a light emitter 42 is fixed to the holding member 32 via a support base 41 at a position opposite to the light receiver 38 with the main scale 13 in between. A substrate 52 is fixed to the front side of the holding member 32 via a spacer 51 in parallel with the substrate 29 .

The substrate 52 is formed along a virtual circular locus centered on the rotational axis of the frame 3, and the substrate 2
A guide surface 52A including a ring-shaped end surface identical to that of the spindle 9 is formed, and an encoder 53 and a battery 54 for detecting the amount of axial displacement of the spindle 8 are attached. Here, the elements constituting the encoder 53 are as follows:
In addition to the light emitter 42 and the light receiver 38, an amplifier,
These include waveform shaping circuits and counters.

Between the guide surface 52A of the board 52 and the guide surface 29A of the board 29, as shown in FIG. A power cable 61 is provided. flat cable 61
As shown in Fig. 5, the wire is a belt-like shape in which a plurality of wires are arranged parallel to each other, has a constant curvature equal to the virtual circular locus, and is formed into an arc shape of 270 ± 45 degrees in a free state. There is. When incorporating, the 6th
As shown in the figure, the guide surface 52 of the main body 2 side substrate 52 is reversed halfway and one end side is on the virtual circular locus.
A, and the other end side is fixed to the guide surface 29A of the frame 3 side substrate 29 on the virtual circular locus. Further, the outer surfaces of each of the two parts are the guide surfaces 5 on the main body 2 and the frame 3 side.
It is guided in contact with the ring-shaped end surfaces of 2A and 29A. In other words, the flat cable 61 has sufficient elastic force to be guided in contact with these ring-shaped end surfaces.
For example, it is not made of cloth, but rather has a flexible structure that has an elasticity greater than that of ordinary paper. The encoder 53 is connected to one end of the flat cable 61, and the display electrical component 30 is connected to the other end.

Next, the operation of this embodiment will be explained. When the spindle 8 moves during measurement, the main scale 13 moves parallel to the index scale 37 as the spindle 8 moves, so the change between both optical gratings at that time is detected as an electrical signal by the encoder 53. After that, it is sent to the display electric component 30 through the flat cable 61 and digitally displayed on the digital display 21.

Here, in order to change the orientation of the display section of the digital display 21, the frame 3 is rotated relative to the main body 2. When the frame body 3 rotates, the flat cable 61
Since it only acts as if it were sequentially transferred to the main body 2 side and the frame body 3 side just at the folded portion, no large rotational force is required. Moreover, since the board 52 of the main body 2 and the board 29 of the frame 3 are in contact with each other and a close force is generated, the flat cable 6
No tensile force or the like is generated at both ends of the cable 61, so that wire breakage, terminal disconnection, etc. can be avoided, and the rigidity of the cable 61 prevents it from returning.

Therefore, according to this embodiment, even if the frame 3 is rotated relative to the main body 2, the flat cable 61 just connects the board 52 on the main body 2 side and the frame 3 at the folded part.
Since it only acts to move the frame 3 to the side substrate 29, a large rotational force is not required and the frame 3 can be moved.
Can be rotated 360 degrees.

Further, the flat cable 61 has guide surfaces 52A, 29 between the board 52 of the main body 2 and the board 29 of the frame 3.
Since the flat cable 61 is in contact with A and generates a close force, no tensile force is generated at both ends of the flat cable 61, and breakage of the wire or disconnection of the terminal can be avoided. This means that the flat cable 61 may be multi-layered, and has the advantage that it can be used as is even in a type with a large number of wires. Moreover, frame 3
Since the rotation angle of the flat cable 61 is restricted to 360 degrees or less by the angle restricting means 17, no unreasonable force is applied to the flat cable 61.

Further, since the flat cable 61 is shaped like an arc, not only a large internal space can be secured, but also contact with the spindle 8 and the like can be prevented. As a result, it can be made compact without being restricted by component placement.
Moreover, problems associated with contact with parts provided in the internal space can also be avoided.

Furthermore, even if the frame body 3 and the main body 2 are separated, the flat cable 61 extends in the axial direction, so disassembly for repair or adjustment can be done with the flat cable 61 connected, and the wiring of the flat cable 61 can be done easily. Since parts can be assembled later, assembly and disassembly is also extremely easy.

In addition, in implementation, the encoder 53 is not limited to the photoelectric type described in the above embodiment, but may be any type that can detect the amount of axial displacement of the spindle 8, such as a capacitance type or an electromagnetic type. It can also be a model.
Further, in the above embodiments, up to the counter is an encoder, but the encoder of the present invention may include at least a sensor section, like the light emitter, both scales, and light receiver in the above embodiments.

Furthermore, the present invention is not limited to converting the signal detected by the light receiver into a digital signal, and may instead display an analog value. That is, this is a case where the information is displayed electronically using a scale and a pointer in the form of a dial gauge.

Further, the shapes of the main body 2 and the frame 3 are not limited to the cylindrical shape described in the above embodiment, but may be square. In short, the main body 2 and the frame 3 only need to have a rotatable structure regardless of their contour shapes.

Further, in the above embodiment, the main body 2 and the frame 3 are provided with substrates 52 and 29, respectively, and both substrates 5
2 and 29, both ends of the flat cable 61 may be directly fixed to the inner end surfaces of the main body 2 and the frame 3. This has the advantage that the end of the flat cable can be securely fixed, and only both boards can be removed from the end of the cable.

Further, the arc angle of the flat cable 61 should be determined from the relationship between the force applied thereto and the effective area. By the way, according to experiments, 180-540
It may be in the range of 225 to 315 (270±
45) Degree range is more effective.

Further, the present invention is not limited to the dial gauge described in the above embodiments, but can be applied to measuring instruments in general that display measured values detected by an encoder digitally and/or analogously.

〔Effect of the invention〕

As described above, according to the present invention, the present invention is small, and there is no problem that occurs when the frame body rotates with respect to the main body.
It is possible to provide an electronic display type measuring instrument that is easy to assemble and disassemble.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention, Figure 2 is a front view showing one embodiment of the present invention;
The figure is a sectional view taken along the line -- in Fig. 1, Fig. 3 is a sectional view taken along the - line in Fig. 2, Fig. 4 is a sectional view taken along the - line in Fig. 2, Fig. 5 is a plan view of the flat cable, and Fig. 6 is a sectional view taken along the - line in Fig. 2. This figure is a perspective view showing a state in which a flat cable is assembled, and FIG. 7 is a perspective view showing a conventional wiring structure of a rotating display unit. 2...Main body, 3...Frame, 8...Spindle, 17...
Angle regulating means, 21...Digital display, 29A,
52A...Guidance surface, 30...Electrical equipment for display, 53...Encoder, 61...Flat cable as strip wiring.

Claims (1)

[Scope of Claims] 1. A main body that slidably supports a spindle and includes an encoder for detecting the amount of axial displacement of the spindle, and a main body rotatably attached to the main body and the displacement detected by the encoder. A frame body is provided with display electrical equipment for displaying measured values based on quantities, and a charged wire having an arc shape of a constant curvature is reversed midway, and one end side of this strip wire is attached to the frame. It is fixed to the inner end surface on the virtual circular locus of the main body centered on the rotation axis of the body, and the other end side is fixed to the inner end surface on the virtual circular locus of the frame body that is concentric with and corresponds to the circular locus. , connecting the encoder to the one end side and connecting the display electric component to the other end side,
An electronic display type measuring instrument, characterized in that the encoder is configured to connect the encoder and a display electric component. 2. In claim 1, the main body and the frame are cylindrical bodies, and the main body and the frame are each provided with a guide surface centered on the rotation axis of the frame and including a corresponding ring-shaped end surface. On the other hand, the electronic display type measuring device is characterized in that the band-shaped wiring has a flexible structure having sufficient elasticity so that the outer surfaces of both ends thereof are guided in contact with the ring-shaped end surfaces of the main body side and the frame side. . 3. The electronic display type measuring instrument according to claim 1 or 2, characterized in that the rotation angle of the frame relative to the main body is limited to 360 degrees or less. 4. The electronic display type measuring instrument according to claim 3, characterized in that the shape of the strip-shaped wiring in a free state is an arc shape of 270±45 degrees.