JPH0553361B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the thickness of the tip of a dental reamer, H-file, K-file, etc., the thickness of the tip, the taper, the distance between the blades, the original thickness of the blade, the blade Relating to a device that measures the original thickness, symmetry, etc. of the blade,
More specifically, a thin shaft-like treatment instrument such as a reamer or file is placed between a pair of linear contacts that are always brought into close contact by a spring mechanism or the like, or between a linear contact and a planar contact. The thin shaft-like treatment instrument is moved in the axial direction at a constant speed while cutting in a direction perpendicular to the linear contact, and changes in expansion and contraction of the contact caused by the movement of the thin shaft-like treatment instrument are converted into electrical signals. The shape of the cutting tool is measured by converting the electric signal and sequentially recording it on a recording paper after processing the electrical signal such as increasing the width of the electrical signal. The present invention relates to a shape measuring device for a thin shaft-shaped therapeutic instrument.

When measuring this type of thin shaft-shaped treatment instrument, the height and thickness of the blade crest must be measured with an accuracy of 1/100 to 2/1000, so conventionally, the method (A) was to use micrographs. , (B) Method of enlarging and projecting using a projector,
(C) Direct measurement method using a tool microscope, (D) Measurement method using a micrometer, thickness gauge, etc. have been used, but in the case of (A), the phenomenon and enlarged prints, etc. It takes time, and if you enlarge the thickness direction, the length direction will also be enlarged, so you will need a very large photo, which generally has to be printed in multiple pieces. In the case of (B) and (C), when the thickness direction is expanded, the length direction becomes very large, so it is impossible to measure it in one go, and it has to be slid left and right many times. In addition to the disadvantage that the measurement must be carried out in advance, unlike in case (A), there is also a major disadvantage in that no records are left; in case (D), there is also the disadvantage that no records are left, as in the previous section, and the measurement is difficult. The disadvantages are that it requires skill and that the measured values reflect the habits of the person taking the measurements.

The present invention relates to a completely new technology developed in view of the drawbacks of the conventional technology.

To specifically explain one embodiment of the device according to the present invention with reference to the drawings, in FIG. 2 is fixed to the tip of the sliding shaft 4, and is urged by a spring mechanism or the like so that it can always come into close contact with the probe 1. 5 is a differential transformer (electric micro) attached to the base end of the sliding shaft 4,
It works to convert the amount of movement of the sliding shaft 4 into an electrical signal, and an amplifier 7 and a recorder 8 are sequentially connected to this differential transformer 5 via a cord 6, and a recording pen is connected to this recorder 8. 9, Recording paper 10, Paper feeding device 1 that can feed the recording paper at a constant speed
1st class is installed.

Next, reference numeral 12 denotes a measuring table on which a thin shaft-like treatment instrument 13 such as a reamer is fixed and can be moved while inserting the fixed thin shaft-like treatment instrument 13 between the pair of probes 1 and 2, and a motor 14. It is configured to be able to slide left and right by a feed screw 15 driven by. 16 in the figure shows the recording paper 1 by the pen 9.
2 is a graph showing the shape of the thin shaft-like treatment instrument 13 recorded in FIG.

The shape of the measuring elements 1 and 2 described above is as shown in FIGS. 2 and 4, depending on the type of thin shaft-shaped treatment instrument to be measured.
In some cases, a linear measuring element 1a and a flat planar measuring element 2b are combined, as shown in FIGS. 3 and 4.

In the above embodiment, the differences in the case where the linear measuring tip 1a and 2a are combined and the case where the linear measuring tip 1a and the planar measuring tip 2b are combined and the difference in purpose of use are as follows. be. That is, first, as shown in FIG. 5, when the thin shaft-shaped treatment instrument 13 is a reamer and a K-file constructed by twisting a rectangular prism,
It is also possible to measure the diameter D(A) between the peaks of the thin shaft-like treatment instrument 13 using a device that combines a pair of linear probes 1a and 2a. It is also possible to measure B). Furthermore, when the linear measuring element 1a and the planar measuring element 2b are combined, it is possible to measure the diameter 2+√2/4D(C) between the peak and the valley. Next, when the thin shaft-shaped treatment instrument 13 is a reamer and K-file configured by joining triangular prisms, and a pair of linear probes 1a and 2a is used, as shown in FIGS. 6A and B and FIG. 11. As shown, only the sides and height of the triangle can be measured, and the diameter (thickness) D of the peaks and valleys shown in FIG. 6C cannot be measured. Therefore, as shown in FIG. 7, one uses the linear probe 1a, and the other uses the thin shaft-like treatment instrument 1 as shown in FIG.
By combining these using a planar measuring tip 2b having a length that can simultaneously join at least two or three of the ridges of the blades of No. 3, thin shaft-shaped treatment as shown in FIG. 7A can be performed. The diameter (thickness) D between the peaks of the instrument 13 can be measured. In addition, when the thin shaft-like treatment instrument 13 has relatively high rigidity, the planar measuring tip 2
b is set in advance to 1/2 of the taper angle of the thin shaft-shaped treatment instrument 13.
(the slope of the thin shaft-like treatment instrument 13), the two of the thin shaft-like treatment instruments 13
It is possible to join ~3 blade ridges at the same time. In addition, when the thin shaft-like treatment instrument 13 is extremely thin and has low rigidity, the planar measuring tip 2b is
Even when placed parallel to the axis of the thin shaft-shaped treatment instrument 1
3 bends along the planar measuring tip 2b, so that two to three blade ridges can be joined to the planar measuring tip 2b at the same time.

Furthermore, as shown in FIG. 8, the thin shaft-shaped treatment instrument 13
Even in the case of an H file with a spiral cutting edge, the diameter (thickness) D between the ridges cannot be measured with the combination of linear probes 1a and 2a, so the method shown in (A) and (B) Therefore, it is necessary to combine the linear measuring element 1a and the planar measuring element 2b.

To explain the case where the method of the present invention is carried out using the above measuring device, in the present invention, after fixing the thin shaft-shaped treatment instrument 13 to the measuring table 12, the measuring table 12 is fixed by the feed screw 15. Move the tip of the thin shaft-shaped treatment instrument 13 in a right angle direction toward the measuring tips 1 and 2, and move it forward while inserting the tip of the thin shaft-shaped treatment instrument 13 between the measuring tips 1 and 2. The shaft-shaped treatment instrument 13 is gradually retracted, whereby the outer circumferential shape of the thin shaft-shaped treatment instrument 13 is sequentially measured by the measuring elements 1 and 2, and the amount of movement of the sliding shaft 4 is converted into an electrical signal. , and this can be gradually recorded on the recording paper 10 as a graph 16 using the pen 9 of the recorder 8.

The graph shown in FIG. 9 is a graph measured in this manner and recorded on the recording paper 10. By this, it is possible to measure the thickness D and the distance l between the peaks at a predetermined portion of the thin shaft-like treatment instrument 13, or to measure the taper of the thin shaft-like treatment instrument 13, as shown in FIG. It is possible to measure all of the irregularities of the cutting blade (error in the height of the crest), the thickness of the tip, the overall length, the thickness of the base, the pitch of the cutting blade, etc.

Furthermore, in the present invention, the magnification of the measured value of the thin shaft-shaped treatment instrument 13 can be freely changed in the thickness direction and the length direction.
On the other hand, by increasing the length by 10 times, the entire recording can be made extremely compact on the recording paper 10 having a predetermined length. Furthermore, the measurement accuracy is 5/1000 or less in the thickness direction and 1/10 or less in the length direction.

In the above embodiment, the motor feed of the measuring table 12 and the feed of the recording paper 10 were synchronized, but it is also possible to send the recording paper 10 by electrically converting the measured value of the recorder using an X, Y recorder. Of course it is possible.

As described above, the device according to the present invention passes a thin shaft-like treatment instrument between a pair of opposing probes, converts the amount of movement of the probe into an electrical signal, and records this as a graph on recording paper. By looking at the graph on this recording paper, we measured the thickness of the tip or base of the thin shaft treatment instrument, the taper, the distance between the blades, the height of the blades, the irregularity and symmetry of the blades, etc. It is possible to measure easily and accurately, and it can be measured in a very short amount of time, and the measurement record can be saved as evidence, and even an amateur can easily do it without showing the measurement person's habits. It is possible to measure thin shaft-shaped therapeutic instruments of any shape, and by recording at different magnifications in the thickness direction and length direction, it can be displayed on a single sheet of recording paper. It is possible to record the entire measured value in a compact manner, and furthermore, unlike when actually measuring the diameter of a thin shaft-like treatment instrument, the lower limit can be displayed as a 0 value, so you can know it at a glance. It has characteristics such as being able to do it.

[Brief explanation of the drawing]

1 to 4 are explanatory diagrams of the apparatus of the present invention, FIGS. 5 to 8, and 11 are explanatory diagrams showing the relationship between the probe and the thin shaft-shaped treatment instrument, and FIGS. 9 and 10 are
The figure is an explanatory diagram of a graph obtained by measurement. 1 and 2 are measuring heads, 4 is a sliding shaft, 5 is a transformer,
7 is an amplifier, 8 is a recorder, 9 is a pen, 10 is a recording paper, 12 is a measuring table, 13 is a thin shaft-like treatment instrument, 15
is a feed screw, and 16 is a graph.

Claims (1)

[Scope of Claims] 1. A device for measuring the shape of a thin shaft-like treatment instrument whose dimension in the thickness direction in an axial cross section changes depending on the position in the length direction, the device having a linear shape at the tip. A contact member configured by two linear contacts provided with contact portions facing each other and urged to come into close contact with each other by an urging member, and one linear contact in the contact member a frame that fixes and supports the other linear contact so as to be linearly movable in a direction toward and away from the fixed linear contact; a transfer member that is inserted between the linear contacts in a direction perpendicular to the contact portion and that transports the thin shaft-shaped treatment instrument in the longitudinal direction at a constant speed; and a wire that is supported by the frame so as to be linearly movable. A thin shaft-shaped therapeutic instrument characterized by having a detection member that electrically detects the amount of movement of a shaped contact, and a recording member that records a signal detected by the detection member on a recording paper. Shape measuring device. 2 A device for measuring the shape of a thin shaft-like treatment instrument whose dimension in the thickness direction in the axial cross section changes depending on the position in the length direction, and which has a linear contact portion at the tip. A contact member configured by making a linear contact and a planar contact having a flat surface at their tips face each other and urging them to come into close contact with each other by an urging member; a frame that fixedly supports a linear contact or a planar contact and supports the other planar contact or linear contact so as to be linearly movable in a direction toward and away from the fixed contact; A shaft-shaped treatment instrument is inserted between the linear contact and the planar contact that constitute the contact member in a direction perpendicular to the contact portion, and the thin shaft-shaped treatment instrument is moved longitudinally at a constant speed. A transporting member for transporting, a detecting member for electrically detecting the amount of movement of a linear contact supported by a frame so as to be linearly movable, and a record for recording on recording paper based on the signal detected by the detecting member. 1. A shape measuring device for a thin shaft-like treatment instrument, comprising: a member;