JP2000135228A - Dental fixture for machining member to be cut, and chuck drive part in computer-controller machining device for machining member to be cut for dentistry - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dental fixture for a machining member to be cut to manufacture a dental prosthetic substance by cutting machining by CAD/CAM, and a chuck drive part in a computer-controlled machining device for the machining member to be cut for dentistry for holding a holding shaft of the fixture. SOLUTION: A fixture 2 is composed to comprise a flange part 2a having a flat surface on the back surface side in which a machining member 1 to be cut is fixed to the front surface side, and a round rod holding shaft 2b having an inclined flat surface at a back end 2c, a chuck drive part comprising a collet chuck main body 4 provided with chuck claws 4a having a flat surface at a tip surface movable in an axial direction only in a housing 5 rotated in a main body 7, and a material positioning pin 3 having a tip part pressed by a coil spring 3b toward the chuck claws 4a in the collet chuck main body 4 to get in line- or surface-contact with the inclined surface of the fixture 2. In the main body 7, proximity sensors 12 and 11 to contactlessly detect the position of the material positioning pin 3 and the rotation position of the housing 5 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental prosthesis which is used when a dental prosthesis such as a crown or an inlay for prosthetic a tooth defect site in a patient's mouth is cut by CAD / CAM. The present invention relates to a fixture for supporting a member to be machined, and a chuck drive unit in a computer-controlled dental member machining apparatus for a workpiece to be grasped, which grips a gripping shaft provided in the fixture. .

[0002]

2. Description of the Related Art Conventionally, dental prostheses such as crowns and inlays (hereinafter sometimes simply referred to as “prostheses”) for prosthetic restoration of a tooth defect site in a patient's mouth require strict fitting precision. Therefore, they are usually manufactured by a precision casting method such as a lost wax method. Also, when producing these prostheses, many procedures were required, such as the creation of a cavity as a prosthetic site by a dentist, the collection of impressions (molding) of the defective site, and the production of a plaster model. . In addition, the production of these prostheses requires the strict fitting precision as described above, so that a person with a national qualification as a dental technician was to be hit.

[0003] By the way, in accordance with the recent development of computer technology, various kinds of processing technologies have been developed. This is generally CAD (Computer Aided Desig)
n) and a processing technology called CAM (Computer Aided Manufacturing). Various applications of the CAD / CAM processing technology have been attempted in the dental field for the purpose of producing the above-described prosthesis.

[0004] For example, a technique disclosed in Japanese Patent Application Laid-Open No. 58-187802 is one example. The technique is what is called a digital processing method controlled by a computer, and reads the three-dimensional shape of a prosthesis target portion using a non-contact reading device using light waves or sound waves that do not cause trauma. Then, the data is converted into a digital signal and sent to a digitally controlled machine tool, in which a prosthesis that exactly conforms to the shape of the target body part (prosthesis location) is to be produced. These things are done automatically by the computer.

[0005] As the digitally controlled machine tool exemplified here, a micro milling machine is cited.
By the way, as a device that can be used for processing a small and highly accurate workpiece such as a prosthesis, a group of machine tools generally called a machining center ( Hereinafter, these high-precision digitally controlled machine tools may be simply referred to as processing apparatuses.)

Under these circumstances, in order to produce a high-precision prosthesis, it is necessary to position a mounting position of a member to be cut to be processed to a processing device (hereinafter, simply referred to as a set). It is a matter of course that) may have important meaning. As a prior art in which the positional relationship between the member to be machined and the cutting tool and the mounting state are taken into consideration, for example, "a semi-finished product for producing a mold part for dental technology" disclosed in Japanese Patent Publication No. 7-28878. (Hereinafter sometimes simply referred to as semi-finished products).

The prior art states that the purpose is to provide a semi-finished product suitable for automatic production by a polishing operation. In other words, the purpose is to configure this semi-finished product in advance so that a large number of mold parts for dental technology can be manufactured continuously and easily, and when processing the semi-finished product, there is no prior manual adjustment of the processing equipment. And the necessity is stated. Further, there is a suggestion that it is necessary to take care to deal with a case where a relatively inaccurate material derived from the properties of a material such as a dental ceramic is processed.

[0008] In this prior art, the above-mentioned object and necessity are satisfied by "the crude semi-finished product is provided with a precision finishing portion configured as a holding portion", and the holding portion is preferably Is preferable to be made of a material (eg, metal) different from the semi-finished product main body.

In order to always mount the semi-finished product in a constant positional relationship in the processing apparatus, the semi-finished product is provided on the outer peripheral surface of the cylindrical holding portion as a reference contact portion parallel to its axis and in its longitudinal direction. It discloses that a planar cutout surface or groove is formed. That is, the fixing to the processing apparatus is performed by fixing the semi-finished product by a chuck in the holding part of the semi-finished product, and at this time, the reference contact part formed in the holding part has the semi-finished product in a predetermined positional relationship. In addition to ensuring that only the chuck can be inserted into the chuck, it also provides a positioning reference surface for machining.

[0010] By the way, a member to be machined (hereinafter sometimes referred to as a general concept including the above-mentioned semi-finished product)
It is simple and effective to fix the member to be cut by the chuck when cutting the upper and lower surfaces and the side surfaces. That is, when performing high-precision cutting, a holding shaft for holding by a chuck provided on a member to be cut (hereinafter, may be referred to as a general concept including the above-described holding unit). Is generally used because it is easy to process and a highly accurate product can be obtained. However, when it is necessary to perform the cutting process in consideration of the direction of the cutting process of the member to be cut, the gripping shaft having a round bar shape becomes a neck.

That is, when the member to be cut is a semi-finished product, there is a distinction between the upper and lower surfaces, and when the cutting is performed by computer control using the aforementioned digitally controlled machine tool, the cut to be processed is The mounting position and orientation of the application member are extremely important. However, if the gripping axis is a round bar with no surface on it, there is no mark, so automatic positioning in consideration of the orientation is not possible. You have to rely on the hands of those who do it while checking.

In order to cope with such a situation, it is conceivable to make the gripping shaft into a square bar shape or a triangular bar shape. However, not only does the chuck for gripping the gripping shaft have to have a special structure, but also the rotation of the chuck rotates. Since the alignment between the axis and the axis of the gripping axis becomes very difficult, and a high-precision cut product cannot be obtained after all, it is disclosed in the above-mentioned Japanese Patent Publication No. 7-28878. It was necessary to form a reference contact part consisting of a notch-shaped flat surface and a groove parallel to the gripping axis on the holding part, but in particular, a groove parallel to the gripping axis was formed along the entire length of the gripping axis. In the case of a formed member, if the chuck claw is located at the position of the groove, the tightening for fixing becomes insufficient, causing blurring and vibration during processing, and the member to be cut. Damage or chipping Ukoto undesirable it was found because there is.

[0013] The cutting by computer control has a problem of the size of the member to be cut, in addition to the problem of the position of the set of the member to be cut as described above. This is not a problem when obtaining the same size and shape from the member to be cut or when it is premised to cut out various shapes from a large block. However, when the object has various sizes and shapes such as human teeth and needs to be obtained in a relatively short time, it is significant. In addition, it is necessary to assume that the material of the member to be cut is a material that is hard and difficult to machine such as titanium.

The above-mentioned matter is a problem from the viewpoint of processing efficiency. That is, if the processing time is long, it is not only inefficient, but also a cutting tool (cutting edge) for cutting.
In addition, the working life is shortened and the machining accuracy is deteriorated. If the material is expensive, it is not economical if a large amount of wasted parts (swarf) increases.

In view of such a point, an attempt was made to improve a dental prosthesis processing material disclosed in Japanese Patent Application Laid-Open No. 9-238975. This is to prepare a plurality of dental prosthesis processing materials that have been processed into a standard shape in advance according to the type of human teeth, and use them as appropriate. Although this technology has enabled efficient cutting, there is a possibility that a dental prosthesis processing material having a desired size is not set in a processing device at the time of processing, and may be completely meaningless. So, as an extreme example,
It is a mistake to set a dental prosthesis processing material for a child's front teeth when trying to obtain a male molar. The problem was that no measures were taken to prevent such mistakes.

[0016]

SUMMARY OF THE INVENTION The present invention relates to a method for producing a dental prosthesis using a machining method based on CAD / CAM. It has a complete round bar shape with no notched plane or groove formed on the outer periphery so that the chuck is securely tightened at a predetermined position, and is securely positioned at a predetermined position in a predetermined direction. It is confirmed that there is an error in selecting and setting a dental cutting member, which is prepared in various sizes and shapes in advance, which is not of a desired size. Of a dental cutting member having a gripping shaft that can be easily recognized as a mistake, and a computer-controlled system for manufacturing a dental prosthesis by gripping the gripping shaft. tooth And to provide a chuck driving portion of the cutting member machining devices use.

[0017]

The inventor of the present invention has conducted intensive studies to solve the above-mentioned problems. As a result, a dental cutting member having a front side fixed as a fixture for a dental cutting member is fixed. A flange portion forming a flat surface and a rear surface side also forming a flat surface, and a round-bar-shaped gripping shaft vertically erected substantially at the center of the rear surface side of the flange portion, and a rear end of the gripping shaft. If there is an inclined plane forming an inclination angle of 30 to 70 degrees with respect to the central axis of the gripping axis and the central axis of the gripping axis is located at the end of the inclined plane or in the inclined plane, Since the gripped part of the shaft has a complete round bar shape, it is not only securely gripped by the chuck at a predetermined position, but also has a sufficiently long inclined plane in the longitudinal direction of the gripping shaft. It is installed in the collet hole provided in the collet chuck body described later. The tip of the material positioning pin is in line contact or surface contact with the inclined plane, so that it can be confirmed that the mounting fixture is securely positioned at a predetermined position in a predetermined direction, and further, the material positioning pin is changed. By doing so, it is possible to freely change the position at which the tip of the material positioning pin contacts the inclined plane, and it is desirable to have a dental cutting member prepared in various sizes and shapes in advance. It was determined that if an attempt was made to select and set something that was not the size of, it would be easy to see that it was a mistake (mis-selection).

[0018] Further, as a chuck driving unit of the computer-controlled system for processing a member to be machined for dental cutting, the housing includes a housing that is rotated in the main body by a driving force of a servomotor fixed to the main body. A collet chuck body which is provided so as to be movable only in the axial direction of the collet and has at its tip a chuck claw having a flat distal end surface for gripping a gripping shaft of the fixture for a member to be cut for dental treatment. A material positioning pin having a tip portion which is pressed by a coil spring in the direction of the chuck claw and has a line contact or a surface contact with an inclined plane at a rear end of the gripping shaft is provided in a collet hole provided therein. A pin position detection proximity sensor for detecting the position of the material positioning pin in a non-contact manner through the elongated hole formed in the housing in the main body; And a housing angle proximity sensor for detecting the rotational position of the housing in a non-contact manner is provided in a state where the gripping shaft of the fixture for a member to be machined for dental cutting is gripped by the chuck claws. It is determined whether or not a member of a desired size is gripped in a dental cutting member in which various sizes and shapes are prepared in advance, and whether or not the gripping state is accurate. In addition to being able to discriminate, it has been found that the position of the base angle can be accurately read to drive a computer-controlled dental member processing apparatus for cutting.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a fixture for a workpiece to be machined for dental use according to the present invention and a chuck driving unit of a machine for machining a machined member for dental work according to the present invention; Will be described. FIG. 1 is an enlarged perspective explanatory view showing one embodiment of a fixture for a dental cutting member according to the present invention, and FIG. 2 is a diagram for a dental cutting member according to the present invention shown in FIG. Partial cross-sectional explanatory view schematically showing a part of a state in which the mounting tool is attached to an embodiment of a chuck drive unit of a computer-controlled dental member processing apparatus for cutting according to the present invention, FIG. 3 is an enlarged sectional explanatory view of a main part in FIG.

In the drawings, reference numeral 1 denotes a dental cutting member which is formed into a substantially rectangular parallelepiped or substantially cubic shape using a material such as ceramics, composite resin, or titanium. For anterior teeth, molars,
It is preferable to prepare various sizes such as those for inlays because they can be processed efficiently.

Reference numeral 2 denotes a flange portion 2a having a flat surface on the front side with no unevenness to which the dental workpiece 1 is fixed using an adhesive or the like and a flat surface on the rear side. And a round rod-shaped gripping shaft 2b that stands vertically at substantially the center on the rear side of the portion 2a.
(c) a brass having an inclined plane forming an inclination angle of 30 to 70 degrees with respect to the central axis of the gripping shaft 2b, and the central axis of the gripping shaft 2b being located at the end of the inclined plane or in the inclined plane. And the like (hereinafter, may be simply referred to as a fixture) for a member to be machined for dental cutting formed of a metal such as the above.

Reference numeral 3 denotes a material positioning pin 3 having a tip portion which makes line contact or surface contact with the inclined plane of the rear end 2c of the gripping shaft 2b of the fixture 2, and the tip of which is a gripping shaft 2 of the fixture 2.
If the position of the rear end 2c of the b which is in contact with the inclined plane is prepared in various ways according to the size and shape of the prosthesis after the cutting process, the presence of the material positioning pin 3 prevents the prosthesis that should not be cut. When there is a restriction on the orientation of the set, such as when the fixture 2 to which the cutting member 1 is fixed is set or when the member to be cut 1 which has been pre-processed to a predetermined shape is used in advance. This is preferable because an error in selection is immediately noticed.

As shown in FIGS. 1 and 2, for example, this material positioning pin 3 is a collet described later provided with a chuck claw 4a having a flat distal end surface for gripping a gripping shaft 2b of the fixture 2. A round bar-like shape housed in a collet hole 4b provided in the chuck body 4 is formed in a groove 3a having a predetermined length parallel to the axial direction and formed in a rear peripheral surface thereof. The set screw 4c screwed into the collet chuck body 4 is located at the position, and the movable range in the axial direction (front-back direction) is regulated. Also, the material positioning pins 3 can be smoothly moved in the axial direction (front-rear direction) by the O-rings 4d mounted on the O-ring grooves formed at two positions before and after the groove 3a, respectively. At the time of cutting, it is also possible to prevent the coolant used to prevent the cutting tool (not shown) and the member to be cut 1 from overheating from entering the inside.

The material positioning pin 3 is provided in a collet hole 4b provided in the collet chuck body 4.
In this case, as shown in the embodiment of FIG. 1 and FIG. 2, for example, a coil spring 3b as an elastic member provided in contact with the rear end face is pressed in the direction (forward) of the chuck claw 4a. The inclined plane provided at the rear end 2c of the gripping shaft 2b always keeps contact with the front end of the material positioning pin 3. If attention is paid to the length of the movable stroke of the coil spring 3b and the length of the rear end 2c of the gripping shaft 2b of the fixture 2, it may be assumed that the above-mentioned groove 3a and set screw 4c are not required. It is possible. That is, when the coil spring 3b is crushed to the minimum, it can be completely mounted (the rear surface of the flange portion 2a contacts the tip of the chuck pawl 4a). In this way, by designing so that it can be completely installed only with a certain combination,
You can achieve your purpose.

On the other hand, at the front end of the collet chuck body 4, three slot grooves (not shown) are formed so that the front end surface is flat, the outer shape is a truncated cone, and is divided into three equal parts. A chuck jaw 4a for holding is formed, and when these three chuck jaws 4a are drawn into a truncated conical opening formed at the front of a housing 5 described later and having a large diameter at the front, the chuck is opened. The gripping shaft 2b of the fixture 2 inserted into the chuck claw 4a is inserted into the chuck claw 4a in a state in which the rear surface side flange 2a of the fixture 2 abuts on the distal end surface of the claw 4a. Therefore, the more the collet chuck body 4 moves rearward, the stronger the tightening of the fixture 2 to the holding shaft 2b by the chuck pawls 4a. In addition, with such a configuration, release of the gripping shaft 2b of the fixture 2 only requires moving the collet chuck body 4 forward.

Reference numeral 5 denotes a collet chuck body 4 inside thereof.
Is provided with a through hole 5a for movably accommodating only in the axial direction, and the front side of the through hole 5a has a large diameter at the front according to the outer shape of the chuck claw 4a as described above. A truncated conical opening is formed, and the rear end side of the through hole 5a is opened outward. At a predetermined position, a flange receiving hole 5b having a larger diameter than the through hole 5a forms a stepped portion. It is provided and formed. A step portion provided at a portion of the flange receiving hole 5b communicating with the through hole 5a is made flat, and a disc spring 5c, which is a ring-shaped elastic member, is connected to one end face of this flat face. , And the other end face is provided so as to be in contact with the front flat surface of the collet flange 4e provided at the rear end of the collet chuck body 4 passing through the center hole of the disc spring 5c. Thus, the collet chuck body 4 is always pulled backward by the repulsive force of the disc spring 5c.

The housing 5 includes bearings 6 (6) at two locations, for example, at the front and the center in the main body 7.
a, 6b), and a dust seal 8 is provided further forward of the front bearing 6a to prevent the above-mentioned coolant, dust and the like from entering the inside of the housing 5 and the main body 7. Has been deployed between. And, at the rear, it is connected to a rotation drive mechanism that is rotated inside the main body 7 by the driving force of the servo motor 10 fixed to the main body 7. The rotary drive mechanism is provided such that a worm wheel 4f is integrated with the outer peripheral portion of the housing 5 at a predetermined position between the rear bearing 6b and the collet flange 4e as in the illustrated embodiment, The coupling 9b to which the shaft 9a of the worm gear 9 meshing with the worm wheel 4f is fixed is connected to the coupling fixed to the drive shaft of the servomotor 10 fixed to the main body 7, and also a belt. It goes without saying that the case or the combination of the gears can be properly used.

The main body 7 is provided with a housing angle proximity sensor 11 for detecting the rotational position of the housing 5 in a non-contact manner. As the housing angle proximity sensor 11, an optical sensor including a light emitting unit and a light receiving unit,
Various sensors such as a sensor for measuring a magnetic field and a capacitance can be used, and the illustrated embodiment is a sensor for measuring a magnetic field, and the sensor between the rear bearing 6b and the worm wheel 4f is used. A magnetized sensor screw 5d is screwed into the housing 5 at a predetermined position so as to adjust the distance between the housing 5 and the proximity sensor 11 (the height of the protrusion from the housing 5). A proximity sensor 11 is provided in the main body 7 at a position where
The origin position is detected by capturing the approach of the sensor screw 5d that is rotated by the rotation of the housing 5.

The material positioning pin 3 is inserted into the main body 7 through a long hole 5e formed in the housing 5.
Position Detection Proximity Sensor 1 for Non-Contact Detection of Position
2 are provided. This pin position detection proximity sensor 12
Also, similarly to the above-described housing angle proximity sensor 11, various sensors such as an optical sensor having a light projecting unit and a light receiving unit, and a sensor for measuring a magnetic field and capacitance can be used. This embodiment is a case of a sensor for measuring a magnetic field, in which a front bearing 6a is connected to a rear bearing 6b.
Slot 5e drilled in the housing 5 at a predetermined position between
Is screwed to the material positioning pin 3 so that the distance between the material positioning pin 3 and the proximity sensor 11 (the height of the protrusion from the housing 5) can be adjusted. A proximity sensor 12 is provided on the main body 7 at a position opposite to the position of the material positioning pin 3 in contact with the inclined plane of the rear end 2c of the gripping shaft 2b of the fixture 2 gripped by the chuck pawl 4a. In the state where
By detecting the position of the material positioning pin 3 by capturing the approach of the sensor screw 3c rotating by the rotation of the housing 5, a dental cutting work fixed to the fixture 2 gripped by the chuck pawl 4a. It can be determined whether or not the member 1 has a desired size. In the case of the pin position detection proximity sensor 12 of the illustrated embodiment, a plurality of pin position detection proximity sensors 12 are installed,
Further, the number of the sensor screws 3c is smaller than the number of the pin position detecting proximity sensors 12, so that the sensor screws 3c are fixed to the fixture 2 gripped by the chuck claws 4a by a combination of the pin position detecting proximity sensors 12 that have detected the sensor screws 3c. It is determined whether or not the dental workpiece 1 has a desired size.
If an optical sensor in which a large number of light receiving portions are arranged in parallel is used, the position of the material positioning pin 3 can be detected in many stages based on the amount of light received.

Reference numeral 13 denotes an air cylinder which is attached to the rear portion of the main body 7 and which operates when receiving a signal indicating the end of the cutting of the member 1 to be cut, and whose cylinder shaft 13a extends. Then, the rear end of the re-chuck cam 14 supported by the main body 7 with the cam shaft 14a is pushed down, so that the re-chuck cam 14 rotates about the cam shaft 14a and is provided at the rear end of the collet chuck main body 4. The collet projection 4g is pressed forward against the force of the disc spring 5c, and the front chuck pawl 4a of the collet chuck main body 4 is pushed forward from the front opening of the housing 5, and the gripping shaft 2b of the fixture 2 is moved forward. The workpiece 1 to be cut, which has been released from being held by the chuck pawl 4a and has been cut, can be taken out of the apparatus. In the above description, all components other than the member to be cut 1 and the fixture 2 are referred to as chuck driving parts in the present invention.

The dental prosthesis mounting device according to the present invention having such a structure is gripped by the chuck drive unit of the computer-controlled dental cutting member processing apparatus according to the present invention. Next, the process of manufacturing the above will be described. First, the servo motor 1 fixed to the main body 7
0, the housing 5 is rotated in the main body 7 by the driving force. When the housing angle proximity sensor 11 provided in the main body 7 detects the rotation position of the housing 5, that is, the origin position, the servo motor is driven. The drive of the motor 10 is stopped so that the housing 5 is located at a predetermined rotational position. This operation is performed when the housing angle proximity sensor 11 cannot stop driving the servomotor 10 immediately when the housing angle proximity sensor 11 detects the rotational position of the housing 5, that is, the origin position.
It may be performed by driving the servo motor 10 in the reverse direction by the number of pulses from when the origin position is detected to when the servo motor 10 stops driving.

Next, the air cylinder 13 is operated to extend its cylinder shaft 13a, and when the rear end of the re-chuck cam 14 supported by the main body 7 by the cam shaft 14a is pushed down, the re-chuck cam 14 becomes a cam shaft. 14
a, the collet protrusion 4g provided at the rear end of the collet chuck main body 4 is pressed forward against the force of the disc spring 5c, and the front chuck claw 4a of the collet chuck main body 4 is Is pushed forward from an opening in front of the chuck to open the chuck pawl 4a.

Therefore, the gripping shaft 2b of the fixture 2 to which the dental cutting member 1 is fixed on the front surface side of the flange 2a is formed on the inclined plane provided at the rear end 2c. In the direction of line contact or surface contact with the tip of the material positioning pin 3 (downward in the illustrated embodiment), and the rear surface forming the plane of the flange portion 2a is the front surface forming the plane of the chuck pawl 4a. Is inserted into the opened chuck claw 4a while being pressed against the mounting fixture 2 in that state.
Is slightly rotated clockwise and / or counterclockwise so that the chuck claw 4b is rotated by the coil spring 3b.
The air cylinder 1 is in a state in which the tip end of the material positioning pin 3 pressed in the direction a is in line or surface contact with the inclined plane of the rear end 2c of the gripping shaft 2b and cannot be easily rotated.
3 is released, the cylinder shaft 13a is retracted, and the depression of the rechuck cam 14, which is supported by the main body 7 with the cam shaft 14a, is released, so that the collet chuck main body 4 is moved backward by the force of the disc spring 5c. The chuck pawl 4a that has been moved and opened is pulled into the opening in the front of the housing 5, and the tip of the material positioning pin 3 is attached in line or surface contact with the inclined plane of the rear end 2c of the gripping shaft 2b. The gripping shaft 2b of the tool 2 is gripped. At this time, the rechuck cam 14 pressed by the collet protrusion 4g provided at the rear end of the collet chuck body 4 that has moved rearward rotates about the cam shaft 14a, and the pressing on the collet chuck body 4 is released.

Thereafter, the servo motor 10 fixed to the main body 7 is driven to drive the housing 5 by the driving force.
Is rotated in the main body 7, the main body 7
The position of the material positioning pin 3 is detected in a non-contact manner through a long hole 5e drilled in the housing 5 by a pin position detection proximity sensor 12 provided in Is not at the desired position, the inclined plane provided at the rear end 2c of the gripping shaft 2b of the fixture 2 accurately makes line contact or surface contact with the tip of the material positioning pin 3. It can be seen that the dental cutting member 1 having various sizes or pre-processed shapes prepared in advance is not set to a desired size or shape. .

Thus, the fixture 2 to which the desired dental cutting member 1 is fixed is held in a predetermined position by the chuck claws 4a of the collet chuck body 4 with its gripping shaft 2b correctly and reliably. When it is confirmed that the housing 5 is integrated with the housing 5, the servo motor 10 fixed to the main body 7 is driven to rotate the housing 5 in the main body 7 by the driving force. When the housing angle proximity sensor 11 detects the rotational position of the housing 5, that is, the origin position, the cutting tool (not shown) is used to perform cutting by a computer control method into a desired prosthesis shape.

When the cutting of the member to be cut 1 is completed, the air cylinder 13 is actuated in response to the signal, the cylinder shaft 13a is extended, and the member to be cut for dental treatment 1 is placed on the flat surface of the flange portion 2a. The camshaft 1 is attached to the main body 7 in the same manner as when the gripping shaft 2b of the fixture 2 fixed to the front side is first inserted into the chuck pawl 4a.
4a, the rear end of the rechuck cam 14 supported by the shaft is pressed down, and the collet projection 4g provided on the rear end of the collet chuck body 4 is pressed forward by the rechuck cam 14 against the force of the disc spring 5c. The front chuck 4a of the main body 4 is pushed forward from the front opening of the housing 5, and the gripping shaft 2b of the fixture 2 is
When the workpiece 1 is released from the gripping by a, the machined member 1 to be cut is taken out of the apparatus together with the fixture 2.

[0037]

As described above, in the fixture for a member to be machined for dental use according to the present invention, the front side forms a plane to which the member to be machined is fixed, and the rear side also forms a plane. And a round bar-shaped gripping shaft that is vertically erected substantially at the center of the rear surface side of the flange portion, and at the rear end of the gripping shaft with respect to the center axis of the gripping shaft. 30 ~
The structure has a tilt plane having a tilt angle of 70 degrees and the center axis of the gripping shaft is located at the end of the tilt plane or in the tilt plane. Since it has the shape of a round bar, it is not only securely held by a chuck at a predetermined position, but also has a sufficiently long inclined plane in the longitudinal direction of the holding shaft. The tip of the material positioning pin provided in the collet hole provided in the collet chuck body of the chuck drive unit of the member processing apparatus for cutting to be machined is attached by line contact or surface contact with this inclined plane. In addition to confirming that the tool is securely held at a predetermined position in a predetermined direction, by changing the material positioning pin, the position where the tip of the material positioning pin contacts the inclined plane can be freely changed. Is possible, and if a member to be machined for dental preparation in which various sizes and shapes are prepared in advance and which is not of a desired size is selected and set, an error (selection of Mistake).

Further, the chuck drive unit of the computer-controlled dental cutting member processing apparatus according to the present invention holds the dental cutting member mounting tool according to the present invention, and Dental prosthesis such as crowns and inlays for prosthetic teeth in the oral cavity
It is a chuck driving unit suitable for manufacturing by cutting with M, and is movable only in the axial direction of the housing in a housing that is rotated in the main body by the driving force of a servo motor fixed to the main body. A collet hole provided in a collet chuck main body which is provided and has a chuck claw provided at a tip thereof for holding a gripping shaft of the attachment for a member to be machined for dental cutting, the chuck claw having a flat tip end surface. Inside, a material positioning pin which is pressed by a coil spring in the direction of the chuck pawl and has a tip portion which makes line contact or surface contact with the inclined plane at the rear end of the gripping shaft is provided, and the main body is provided with the material positioning pin. A pin position detection proximity sensor that detects the position of the material positioning pin in a non-contact manner through a long hole formed in the housing, and a non-contact rotation position of the housing. Since it has a structure in which a housing angle proximity sensor that protrudes is provided, various sizes and shapes are prepared in advance in a state where the gripping shaft of the fixture for a member to be machined for dental cutting is gripped by the chuck claws. It is not only possible to determine whether or not a member of a desired size is gripped in the member to be machined for dental cutting, and whether or not the gripping state is accurate, as well as the angle of the base point. The position can be accurately read to drive a computer-controlled dental member processing apparatus for cutting.

As described above, the fixture for a dental cutting member according to the present invention and the chuck driving unit of the computer-controlled dental cutting member processing apparatus are provided with a tooth defect in the oral cavity of a patient. A dental prosthesis, such as a crown or an inlay, for prosthetic parts to be prosthetic can be cut and produced by CAD / CAM, which is a great contribution to the improvement of dental medical techniques.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective explanatory view showing one embodiment of a fixture for a member to be machined for dental use according to the present invention.

FIG. 2 is a diagram illustrating one embodiment of a chuck driving unit of the computer-controlled dental cutting member processing apparatus according to the present invention; FIG. 4 is a partial cross-sectional explanatory view schematically showing a part of a cross-section explaining a state of attachment to an example.

FIG. 3 is an enlarged sectional explanatory view of a main part in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dental cutting member 2 Dental cutting member attachment 2a Flange part 2b Gripping shaft 2c Rear end 3 Material positioning pin 3a Groove 3b Coil spring 3c Sensor screw 4 Collet chuck body 4a Chuck 4b Collet hole 4c Set screw 4d O-ring 4e Collet flange 4f Warm wheel 4g Collet protrusion 5 Housing 5a Through hole 5b Flange receiving hole 5c Disc spring 5d Sensor screw 5e Long hole 6 Bearing 6a Front bearing 6b Rear bearing 7 Body Reference Signs List 8 dust seal 9 worm gear 9a shaft 9b coupling 10 servo motor 11 housing angle proximity sensor 12 pin position detection proximity sensor 13 air cylinder 13a cylinder shaft 14 rechuck cam 14a cam shaft

Claims (2)

[Claims] 1. A member to be machined (1) whose front side is dental.
A flange portion (2a) having a flat surface to which the second member is fixed and a rear surface also having a flat surface, and a round rod-shaped gripping shaft (2b) which is vertically erected substantially at the center of the rear surface side of the flange portion (2a). ), And the rear end (2c) of the gripping shaft (2b) is attached to the gripping shaft (2b).
Characterized in that the gripping shaft (2b) is located at the end of the inclined plane or in the inclined plane. A fixture for a member to be machined for dental work (2). 2. A housing (5) which is rotated in the main body (7) by a driving force of a servo motor (10) fixed to the main body (7) and moves only in the axial direction of the housing (5). 2. A gripping shaft (2b) of a fixture (2) for a member to be cut for dental use according to claim 1, which is freely disposed and has a tip.
Chuck claw (4a) having a flat end surface for gripping
Is pressed by a coil spring (3b) in the direction of the chuck claw (4a) into a collet hole (4b) provided in a collet chuck body (4) provided with the gripping shaft (2).
b) a material locating pin (3) having a leading end in line or surface contact with the inclined plane of the rear end (2c) is provided;
A pin position detecting proximity sensor (12) for detecting the position of the material positioning pin (3) in a non-contact manner through an elongated hole (5e) formed in the housing (5) in the main body (7). And a computer-controlled dental device for machining a member to be machined for cutting, which is provided with a housing angle proximity sensor (11) for detecting the rotational position of the housing (5) in a non-contact manner. Department.