JP3082184B2 - Dental handpiece rotation detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation detecting device for measuring the number of revolutions of a handpiece used for cutting, polishing, or technical use of teeth, and more particularly, to a rotation detector mounted on a rotating shaft of the handpiece when measuring the number of revolutions. The present invention relates to a magnetized bar that guides the rotation of the magnetized bar to a sensor section of the main body of the detection device.

[0002]

2. Description of the Related Art Conventionally, in dental care and the like, a hand-held dental cutter called a handpiece has been used. Handpieces are classified roughly into two types, depending on their use, such as those using a micro (electric) engine consisting of a motor such as a motor as a drive source and those using an air turbine (air motor) as a drive source. The rotation speed of the cutting tool mounted on the micro engine type is 400 ~
150,000rpm, 300,000-500, for air turbine type
Extremely high durability is required for internal components such as a movable part such as a rotating shaft for holding a cutting tool and a bearing part for holding the same, even at 000 rpm.

For this reason, the durability is improved by forming the internal components from special steel, etc., but there is a limit, and the handpiece deteriorates due to wear and fatigue of the components, and the original rotational speed is obtained. In the event that it is no longer possible, parts are replaced and repaired.

Incidentally, such deterioration of the handpiece can be recognized in many cases by a decrease in the number of revolutions. In particular, as described above, the rotation of the rotating shaft is 300,000 to 50,000.
With air turbine type handpieces that reach up to 0,000 rpm, it is difficult for the user to perceive the decrease in rotation speed by feeling etc., and even though the original rotation speed cannot be obtained due to deterioration. When used for treatment, etc., not only the user but also the patient is adversely affected.

[0005] Under such circumstances, a device for measuring the number of revolutions of the handpiece is required. The method itself for measuring the number of revolutions of the handpiece is disclosed in, for example, Japanese Patent Application Laid-Open No. Sho 59-2676.
No. 3 discloses this. In this method, the rotation axis is magnetized and its rotation is detected by a magnetoresistive element built into the handpiece itself. However, if a measuring device is incorporated in the handpiece, the handpiece becomes larger, more expensive, and more flexible. Because of the inconvenience of lowering, insert a magnetized bar for measurement, which is magnetized instead of a cutting tool, into the rotating shaft of the handpiece, and measure the rotation of the magnetized bar based on the magnetoresistive element and this. There is a rotation detection device that detects the rotation speed of the handpiece by performing measurement using a dedicated detection device independent of the handpiece and having a display unit that displays the rotation speed of the handpiece.

[0006]

However, the inner diameter of the chuck portion formed on the rotating shaft of the handpiece for mounting and fixing the cutting tool is an air turbine type.
6 mm, 1.6 mm and 2.35 micro engine type
mm, and in the case of the micro-engine type, there is also a handpiece of the external shape called the contra-angle type in which the chuck itself has a locking portion and a locking portion. In the rotation detection device consisting of a magnetized bar and a magnetized bar, it is necessary to prepare a plurality of magnetized bars having different outer dimensions and structures according to the inner diameter of the chuck portion and its structure. Management becomes complicated.

[0007] The present invention has been made in view of this point,
It is an object of the present invention to provide a dental handpiece rotation detecting device capable of reducing the number of magnetized bars.

[0008]

In order to achieve the above object, the present invention provides a detecting device main body comprising a sensor section comprising a magnetic sensing element and a display section for displaying the number of revolutions measured based on the sensor section, A magnetized bar that guides the rotation of the dental handpiece to the portion and is detachably attached to the dental handpiece, wherein the magnetized bar has at least a first part and a second part that have different outer diameters from each other. Parts. Particularly, each of the first and second portions is magnetized. In particular, the magnetized bar has an engaging portion.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A magnetizing bar for guiding rotation of a dental handpiece to a sensor section of a main body of a detecting device is constituted by a first portion and a second portion having different outer diameters. The number of rotations of two types of handpieces having different inner diameters of the chuck portion can be measured with the magnetized bar. That is, when measuring the number of rotations of a handpiece having a large inner diameter of the chuck portion, of the first and second portions of the magnetized bar, the side having the larger outer diameter is attached to the chuck portion. When measuring the number of rotations of a handpiece having a small inner diameter of the handpiece, the rotation of the handpiece is reduced by attaching the larger outer diameter side of the first and second portions of the magnetized bar to the chuck portion. It can be guided to the sensor section of the detection device main body.

If both the first and second portions of the magnetized bar are magnetized, a dedicated portion for guiding the rotation of the handpiece to the sensor section of the main body of the detecting device is not provided on a portion of the magnetized bar. And the manufacture of the magnetized bar becomes easy.

Further, if an engaging portion corresponding to the chuck portion structure of the handpiece is formed in a part of the magnetized bar, it becomes possible to measure the rotation speed of the handpiece having a different chuck portion structure.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1A is a front view of a main body of the detection device, and FIG. 1B is a perspective view of a magnetized bar. The main body 1 of the detection device includes a case 2 forming a housing, a sensor portion 3, It comprises an analog meter type display unit 4 for displaying the number of revolutions measured based on the sensor unit 3, and a power switch 5. On the other hand, the magnetized bar 6 has, for example, a large-diameter portion (first portion) 7 having an outer diameter R1 of approximately 2.35 mm, for example.
Small-diameter portion (second portion) 8 having an outer diameter dimension R2 of 1.6 mm 8
And a non-illustrated N-pole and an S-pole, which are not shown, are formed on the radial surface of the large-diameter portion 7 and the small-diameter portion 8 orthogonal to the axis thereof. Each pole is magnetized one by one at a pitch. In this case, the large-diameter portion 7 and the small-diameter portion 8 constitute a mounting portion of a handpiece to be described later attached to a chuck portion.

FIG. 2 is a side view showing the inside of the detection device 1 shown in FIG. 1A. In this case, the sensor unit 3 includes a Hall IC 9 as a magnetic sensing element and a Hall IC 9
The lead 11 of the Hall IC 9 extends into the case 2 and is soldered to the printed circuit board 12. And stainless steel plate
The magnetized bar 6 that rotates with the rotating shaft by being attached to the chuck of the rotating shaft of a handpiece (not shown) is brought forward of the magnetized bar 6.
A pulse (detection) signal corresponding to the rotation of the magnetic pole is output, the pulse signal is counted at regular intervals by a counter (not shown), and the display unit 4 of the analog meter type is driven by a drive signal corresponding to the count value. To display the number of rotations.

FIGS. 3 (a) and 3 (b) show the magnetized bar 6 mounted on the handpiece 13, and the detailed structure of the handpiece 13 itself is disclosed, for example, in Japanese Patent Laid-Open No. 6-38983. The detailed structure is omitted here.

That is, in the rotating shaft 14 of the handpiece 13 shown in FIG. 3A, the inner diameter R3 of the chuck portion 15 for mounting and fixing a cutting tool (not shown) by press fitting is set to 2.35 mm. Therefore, in this case, the large-diameter portion 7 is attached to the chuck portion 15 and the small-diameter portion 6 is attached to the sensor unit 3 of the main body of the detecting device.
, The rotation of the rotating shaft is guided to the sensor unit 3 and the rotation is detected. On the other hand, FIG.
In the case of the rotating shaft 14 of the handpiece 13 shown in (a), the inner diameter dimension R4 of the chuck portion 15 for mounting and fixing the cutting tool (not shown) by press fitting is set to 1.6 mm. By mounting the part 6 side to the chuck part 15 and bringing the large diameter part 7 side close to the sensor part 3 of the main body of the detection device,
The rotation of the rotating shaft is guided to the sensor unit 3 and the rotation is detected.

As described above, according to the present embodiment, the magnetizing bar 6 for guiding the rotation of the handpiece 13 to the sensor unit 3 of the detection device main body 1 is constituted by the large-diameter part 7 and the small-diameter part 8. As a result, the inner diameter R of the chuck portion 15 can be increased by one magnetized bar 6.
The number of rotations of the two types of handpieces 13 having different R3 and R4 can be measured, and the number of magnetized bars 6 can be reduced.

According to the present embodiment, both the large-diameter portion (first portion) 7 and the small-diameter portion (second portion) 8 of the magnetized bar 6 are magnetized, so that the hand Since a dedicated portion for guiding the rotation of the piece 13 to the sensor portion 3 of the detection device main body 1 does not need to be provided in a part of the magnetized bar 6, the manufacture of the magnetized bar can be facilitated. According to the gist of the invention, the large-diameter portion 7 and the small-diameter portion 8 do not necessarily have to be magnetized. For example, as shown in FIG. And a dedicated detecting portion 6a composed of a bulged portion that is magnetized, and this portion is
May be arranged close to the sensor unit 3 to detect the number of rotations. According to this configuration, the detection unit 6 including the bulging portion
Since the rotation speed is detected by the rotation of the magnetic pole a, the detection accuracy is improved. At this time, the large-diameter portion 7 and the small-diameter portion 8 may be magnetized together with the detection unit 6a.

In the embodiment shown in FIGS. 1 to 3, the case in which the chuck portion 15 of the handpiece 13 is press-fitted is shown. However, the present invention is applicable to various chucking methods other than the press-fitting chuck method. For example, by rotating a rotating body, the present invention can also be applied to a chuck portion configured by each facing surface of a plurality of fixed pieces.

In the embodiment shown in FIGS. 1 to 3, the outer diameters of the large-diameter portion 7 and the small-diameter portion 8 are approximately 2.35 mm and approximately 1.30 mm, respectively.
The outer diameter of the large diameter part 7 and the small diameter part 8 is set to 6 mm.
The setting can be appropriately made according to the inner diameter of the chuck portion 15 of the handpiece 13.

FIG. 5 shows still another embodiment of the present invention. In this embodiment, the magnetized bar 6 has an engaging portion 16 at the end of the small diameter portion 8. Is formed corresponding to a chuck structure including a locking portion and a locking portion of a contra-angle type handpiece (not shown) (for example, see JP-A-4-226645 and JP-A-4-90752). The engaging portion 16 on the upper side in the drawing matches the locking portion, and the engaging portion 16 located on the lower side in the drawing is engaged with the lock portion.

As described above, according to the present embodiment, the engaging portion 16 corresponding to the chuck portion of the contra-angle handpiece is formed in a part of the magnetized bar 6 (in this case, the small-diameter portion 7 side). By attaching the side on which the engaging portion 16 is formed to the chuck portion 15 of the handpiece 13, the chuck portion structure can be applied to a contra-angle type handpiece having a different structure. The number of rotations of three types of handpieces having not only the inner diameter dimensions but also the chuck structure itself can be measured, and the number of magnetized bars 6 can be further reduced.

In this embodiment, the magnetized bar 6 has an engaging portion corresponding to the chuck portion of the contra-angle handpiece.
Although the engaging portion 16 is formed, the engaging portion 16 can be formed not only for the chuck portion of the contra-angle type handpiece, but also for the chuck portion of any type of handpiece having a different structure.

Further, in this embodiment, for the purpose of forming the notch portion 16, when the side on which the engaging portion 16 is formed is made to approach the sensor portion 3 of the detection device main body 1, the step portion by the engaging portion 16 is used. It is desirable that the small-diameter portion 8 having no step is brought close to the sensor section 3. In consideration of this point, the axial direction of the small-diameter portion 8 having no step may be formed to be slightly longer.

[0025]

As described in detail above, the present invention relates to a detection device main body including a sensor unit including a magnetic sensing element and a display unit for displaying the number of revolutions measured based on the sensor unit, and a dental unit provided on the sensor unit. A magnetized bar that guides the rotation of the dental handpiece and is detachably attached to the dental handpiece. The magnetized bar includes at least a first portion and a second portion having different outer diameters from each other. By providing the dental handpiece, a dental handpiece that can reduce the number of magnetized bars can be provided.

According to the present invention, since the first and second portions are magnetized, the manufacture of the magnetized bar can be facilitated.

Further, since the magnetized bar has the engaging portion, it is possible to measure the number of rotations of a handpiece having a different chuck portion structure.

[Brief description of the drawings]

FIG. 1A is a front view of a detection device main body according to the present invention, and FIG. 1B is a perspective view of a magnetized bar according to the present invention.

FIG. 2 is a side view showing the internal configuration of the detection device main body of FIG. 1 (a).

3 (a) is a front view showing a case where the magnetized bar of FIG. 1 (b) is attached to a handpiece, and FIG.
It is a front view showing the case where the magnetization bar of (b) is attached to another handpiece.

FIG. 4 is a front view of a magnetized bar according to another embodiment of the present invention.

FIG. 5 is a perspective view showing a magnetized bar according to still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Detecting device main body 3 Sensor part 4 Display part 6 Magnetization bar 7 Large diameter part 8 Small diameter part 11 Magnetic detection element 13 Handpiece 16 Engagement part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-51300 (JP, A) JP-A-53-103091 (JP, A) JP-A-50-33689 (JP, A) JP-A-58-58 103446 (JP, A) JP-A-54-44386 (JP, A) JP-A-62-101804 (JP, A) JP-A-59-26763 (JP, A) Japanese Utility Model Publication No. 58-120714 (JP, U) Special Table 7-502920 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) A61C 1/00-1/08

Claims (3)

(57) [Claims] 1. A detecting device main body comprising a sensor section comprising a magnetic sensing element and a display section for displaying the number of revolutions measured based on the sensor section, a dental hand being guided to the sensor section and the dental hand being rotated. A magnetized bar removably attached to the piece, wherein the magnetized bar includes at least a first portion and a second portion having different outer diameters from each other. Rotation detection device. 2. The dental handpiece rotation detecting device according to claim 1, wherein each of said first and second portions is magnetized. 3. The dental handpiece rotation detecting device according to claim 1, wherein said magnetized bar has an engaging portion.