JP2015196233A - rotary tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary tool capable of restraining a load applied to a connection part between a tool body part and a tool base part, without reducing processing efficiency.SOLUTION: A rotary tool comprises a rotary rod 30 rotatingly driven by being installed in a rotational driving part, a tool body part 20 pressed to a work W and processing its work W and a joint part for connecting a part between the rotary rod 30 and the tool body part 20 so that the tool body part 20 rotates at the same rotational speed as the rotary rod 30, allowing to be changed to an optional attitude of including an origin attitude where the gravity center axis 20J of the tool body part 20 coincides with a rotary shaft 30J of the rotary rid 30 and also prohibiting separation between the rotary rod 30 ans the tool body part 20.

Description

  The present invention relates to a rotary tool including a tool base portion that is attached to a rotational drive unit and is rotationally driven, and a tool main body unit that is pressed against the workpiece and processes the workpiece.

  Conventional rotary tools of this type include, for example, a tool body having a grinding part at the outer edge of the disk and a fitting hole passing through the center, and an insertion fit into the fitting hole of the tool body. There is known a tool that is provided with a combined rod-shaped tool base portion and performs grinding by bringing a rotating tool body portion into contact with a workpiece (for example, see Patent Document 1).

JP 2010-284791 (paragraphs [0037] to [0040], FIG. 1)

  However, in the conventional rotary tool described above, the machining reaction force from the workpiece is applied to the fitting portion with the tool main body portion and the tool base portion, and if the workpiece shape and the fixing position vary, the load applied to them increases. There is a fear. On the other hand, if the position of the rotary tool is finely adjusted every time according to the variation of the shape of the workpiece and the fixed position, there is a problem that the machining efficiency is lowered.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a rotary tool capable of suppressing a load applied to a connection portion with a tool main body portion and a tool base portion without reducing machining efficiency. To do.

  The rotary tool according to the invention of claim 1 made to achieve the above object includes a tool base portion that is attached to a rotational drive unit and is rotationally driven, and a tool main body portion that is pressed against the workpiece to process the workpiece. The tool body is connected between the tool base and the tool body so that the tool body rotates at the same rotational speed as the tool base, and the center of gravity of the tool body matches the rotation axis of the tool base. It is characterized in that it is provided with a joint portion that allows the tool base portion and the tool main body portion to be separated from each other, and that allows the posture to be changed to an arbitrary posture.

  According to a second aspect of the present invention, in the rotary tool according to the first aspect, provided with an origin posture holding means provided between the tool base portion and the tool body portion and biasing the tool body portion to the origin posture. Has characteristics.

  According to a third aspect of the present invention, in the rotary tool according to the second aspect of the invention, there is provided an origin posture holding means capable of holding the tool body portion at the origin posture regardless of the direction of the rotation axis of the tool base portion with respect to the direction of gravity. Has characteristics.

  According to a fourth aspect of the present invention, in the rotary tool according to the second or third aspect, the joint portion is provided on one and the other of the tool main body portion and the tool base portion, and is fitted with a fitting hole portion and a fitting portion. Formed on the other mating surface, a plurality of protrusions formed on one mating surface of the male male portion, the mating male portion and the mating hole portion, and arranged evenly along the circumferential direction A contacted part that is in contact with a plurality of protrusions, a contact curved surface that is formed on one of the protrusions or the contacted part and that makes line contact or point contact between the protrusion and the contacted part, and a tool First and second positioning protrusions provided on one and the other of the main body part and the tool base part, and abutting each other in the direction of the rotation axis of the tool base part to position the tool main body part in the origin posture And a first positioning member provided on a side of the tool body portion and the tool base portion having the first positioning protrusion wall. A spring support wall facing the second positioning projection wall from the opposite side of the wall, and a compression coil spring as an origin posture holding means provided in a tension state between the spring support wall and the second positioning projection wall, It is characterized by where it is provided.

  According to a fifth aspect of the present invention, in the rotary tool according to the fourth aspect, the tool body has a structure having a grinding part for grinding the workpiece on the outer edge part of the disk part as the second positioning projection wall. Both are provided with a fitting hole at the center of the disk part, and the tool base part has a fitting male part, and a first positioning protrusion wall and a spring support wall that are opposed to each other with the fitting male part interposed therebetween. It has the characteristics.

  According to a sixth aspect of the present invention, in the rotary tool according to the fifth aspect, the tool base portion includes a pair of fitting male portions fitted in the fitting hole portions of the pair of tool main body portions arranged coaxially. A first positioning projecting wall common between the pair of tool body parts, a pair of spring support walls facing each tool body part from the opposite side of the first positioning projecting wall, and each tool It has a feature in that it has a pair of compression coil springs that press the main body portion against the first positioning projection wall.

  The invention of claim 7 is the rotary tool according to claim 4, wherein the tool main body portion has an extended cylindrical portion extending in the direction of the center of gravity axis from the outer edge portion of the disk portion as the second positioning projection wall, The cylindrical part has a structure having a grinding part for grinding the workpiece on the outer peripheral surface or inner peripheral surface or tip surface thereof, and a fitting hole is provided at the center of the disk part. And having a first positioning projection wall and a spring support wall facing each other with the fitting male part interposed therebetween.

  According to an eighth aspect of the present invention, in the rotary tool according to the fourth aspect, the tool main body has a shaft portion extending in the direction of the center of gravity axis from the center of the disk portion as the second positioning projection wall and the fitting male portion. Then, a structure having a grinding part or a blade part for processing a workpiece at the tip part of the shaft part is formed, and the tool base part has a fitting hole part and is opposed to the disk part. The positioning projection wall and the spring support wall are characterized.

  According to a ninth aspect of the present invention, there is provided a rotary tool that is attached to a rotary drive unit and driven to rotate, a tool base unit that is pressed against the workpiece and processes the workpiece, and the tool base unit to the tool main unit. A power relay shaft that transmits rotational power and a power relay shaft that connects between the tool base and one end of the power relay shaft so that the power relay shaft rotates at the same rotational speed as the tool base. A first joint portion that allows the center of gravity axis of the portion to be changed to an arbitrary posture including an origin posture that coincides with the rotation axis of the tool base portion, and prohibits separation of the tool base portion and the tool main body portion; The other end of the power relay shaft and the tool main body are connected so that the tool main body rotates at the same rotational speed as the power relay shaft, and the center of gravity of the tool main body is the center of gravity of the power relay shaft. For any posture including the origin posture that matches the axis Allowed vital that are subject, characterized in was a second joint portion that prohibits the separation of the power relay shaft portion and the tool body.

  A tenth aspect of the present invention is the rotary tool according to the ninth aspect, wherein the rotary tool according to the ninth aspect is provided between the tool base portion and the power relay shaft portion, and first origin posture holding means for biasing the power relay shaft portion to the home posture. And a second origin posture holding means that is provided between the power relay shaft portion and the tool body portion and biases the tool body portion to the origin posture.

  The invention according to claim 11 is the rotary tool according to claim 10, wherein the tool main body and the tool main body can be held in the home position regardless of the direction of the rotation axis of the tool base with respect to the direction of gravity. It is characterized in that it is provided with the origin posture holding means.

  According to a twelfth aspect of the present invention, in the rotary tool according to any one of the ninth to eleventh aspects, the first joint portion is provided on one or the other of the tool base portion and the power relay shaft portion and is fitted to each other. 1st fitting hole part and 1st fitting male part which match, and it is formed in any one fitting surface of a 1st fitting male part and a 1st fitting hole part, and is equal along the circumferential direction A plurality of arranged first protrusions, a first abutting portion formed on the other fitting surface and in contact with the plurality of first protrusions, and one of the first protrusion or the first abutting portion Formed on the first abutting curved surface that makes line contact or point contact between the first protrusion and the first abutted portion, and one and the other of the tool base portion and the power relay shaft portion, First and second positioning projection walls that abut the tool base portion in the rotation axis direction to position the power relay shaft portion so as to be in the home position, a tool base portion, and A first spring support wall provided on a side of the power relay shaft portion having the first positioning projection wall and facing the second positioning projection wall from a side opposite to the first positioning projection wall; and a first spring support A first compression coil spring serving as a first origin posture holding means provided in a stretched state between the wall and the second positioning projection wall, and a power relay shaft portion, a tool body portion, The second fitting hole and the second fitting male part that are provided on one and the other of the two fitting parts, and the fitting surface of any one of the second fitting male part and the second fitting hole part. A plurality of second protrusions that are formed and equally arranged along the circumferential direction, a second contacted part that is formed on the other fitting surface and contacts the plurality of second protrusions, and a second protrusion A second abutting curved surface formed on one of the first contact portion and the second abutted portion to bring the second protrusion and the second abutted portion into line contact or point contact, and power 3rd and 4th which are provided in one side and other side of a joint shaft part and a tool main-body part, abut each other in the rotation axis direction of a power relay shaft part, and position a power relay shaft part so that it may become an origin posture. The positioning projection wall, the power relay shaft portion and the tool body portion are provided on the side having the third positioning projection wall, and face the fourth positioning projection wall from the side opposite to the third positioning projection wall. It is characterized in that a two-spring support wall and a second compression coil spring as second origin posture holding means provided in a stretched state between the second spring support wall and the fourth positioning projection wall are provided.

  According to a thirteenth aspect of the present invention, in the rotary tool according to the twelfth aspect, the tool main body portion includes a shaft portion extending in the direction of the center of gravity from the center of the disk portion as the fourth positioning protrusion wall and the second fitting male portion. And a structure having a grinding part or a blade part for processing a workpiece at the tip part of the shaft part. The power relay shaft part has a second fitting hole part and sandwiches the disk part. And a third positioning projection wall and a second spring support wall which are opposed to each other.

[Invention of Claim 1]
According to the rotary tool of claim 1, the tool base portion and the tool main body portion are connected so that the tool main body portion rotates at the same rotational speed as the tool base portion, and the center of gravity axis of the tool main body portion is the tool base. Since it has a joint that allows it to be changed to an arbitrary posture including the origin posture that coincides with the rotation axis of the part, the shape of the workpiece, fixed position, etc. can be changed without fine adjustment of the position of the rotary tool. The tool body is changed to an arbitrary posture according to the variation, and the workpiece can be processed in a state in which the variation is absorbed. As a result, it is possible to suppress the load applied to the connecting portion with the tool main body and the tool base without reducing the processing efficiency.

[Invention of claim 2]
According to invention of Claim 2, a tool main-body part can be pressed against a workpiece | work with the urging | biasing force of an origin attitude | position holding means.

[Invention of claim 3]
According to the third aspect of the present invention, the tool main body can be held in the origin posture regardless of the gravity, so that the degree of freedom in arranging the rotary tool with respect to the workpiece is improved.

[Invention of claim 4]
The joint portion according to the present invention may be a cardan joint, a Rzeppa joint or the like, and is provided on one and the other of the tool main body portion and the tool base portion as in the invention of claim 4 and is fitted to each other. A plurality of protrusions formed on one of the fitting surfaces of the fitting male part and the fitting hole part and arranged uniformly along the circumferential direction thereof, A contacted part formed on the other mating surface and in contact with a plurality of protrusions, and formed on one of the protrusion or the contacted part, and the protrusion and the contacted part are in line contact or point contact. You may make it the structure provided with the contact | abutting curved surface to be made.

  In this case, the second provided on either the tool main body or the tool base between the spring support wall provided on either the tool main body or the tool base and the first positioning projection wall. By providing a compression coil spring in a stretched state between the spring support wall and the second positioning projection wall with the positioning projection wall interposed therebetween, the first and second positioning projection walls are arranged in the direction of the rotation axis of the tool base portion. The tool main body portion can be positioned in the origin posture.

[Inventions of Claims 5 and 7]
The tool main body according to the present invention may have a structure having a grinding part for grinding a workpiece on the outer edge part of the disk part as the second positioning projection wall, as in the invention of claim 5, As in the seventh aspect of the present invention, an extended cylindrical portion extending in the direction of the center of gravity axis from the outer edge portion of the disk portion as the second positioning projection wall is provided, and the outer peripheral surface or inner peripheral surface or tip of the extended cylindrical portion You may make it the structure which has the grinding part for grinding a workpiece | work on the surface. When a machining reaction force exceeding the urging force of the compression coil spring is received, the tool body is tilted with respect to the tool base and changed to a posture other than the original posture, so that the tool body and the fitting male part can be fitted. It is possible to suppress the load applied to the fitting portion with the joint hole. Further, the tool body portion is pressed against the first positioning protrusion wall of the tool base portion by a compression coil spring provided in a stretched state between the spring support wall and the disk portion as the second positioning protrusion wall. Can be held at the origin posture.

[Invention of claim 6]
According to the invention of claim 6, since the tool main body portions are provided in pairs in the direction of the rotation axis of the tool base portion, the work is entered between the paired tool main body portions, It is possible to grind two different parts of the workpiece simultaneously. In addition, a pair of tool main body portions are changed to a posture other than the original posture by a workpiece that has entered between a pair of tool main body portions, and a load applied to a connection portion between the pair of tool main body portions and the tool base portion. Each can be suppressed.

[Invention of Claim 8]
According to invention of Claim 8, a tool main-body part has a shaft part extended in the center-of-gravity axis direction from the center of the disk part as a 2nd positioning protrusion wall and a fitting male part, and it exists in the front-end | tip of the shaft part. The workpiece can be ground or cut by pressing the provided grinding portion or blade portion against the workpiece. Further, the disk body is pressed against the first positioning protrusion wall of the tool base portion by a compression coil spring provided in a stretched state between the spring support wall and the disk portion as the second positioning protrusion wall, so that the tool body The part is held in the origin posture. Further, when receiving a processing reaction force exceeding the urging force of the compression coil spring, the disk part as the fitting male part tilts inside the fitting hole part, and the tool body part is changed to a posture other than the origin posture, and the tool body And the load applied to the fitting portion between the fitting hole and the disc portion can be suppressed.

[Invention of claim 9]
According to the invention of claim 9, the tool base portion and the power relay shaft portion rotate at the same rotational speed, and any posture including an origin posture where the center of gravity axis of the power relay shaft portion coincides with the rotation axis of the tool base portion. So that the tool base portion and one end portion of the power relay shaft portion are connected by the first joint portion, and the power relay shaft portion and the tool main body portion have the same rotational speed. The other end of the power relay shaft and the tool body are allowed to be changed to any posture including the origin posture in which the center of gravity axis of the tool body portion coincides with the center of gravity axis of the power relay shaft portion. Since the part is connected by the second joint part, the tool body part and the power relay shaft part can be in any posture according to variations in workpiece shape, fixed position, etc. without fine adjustment of the position of the rotary tool. In order to absorb these variations, It can be processed in the click. As a result, it is possible to suppress the load applied to the tool main body, the connecting portion between the power relay shaft portion and the tool main body portion, and the connecting portion between the tool base portion and the power relay shaft portion without lowering the machining efficiency. Become.

  Further, one end portion of the power relay shaft portion is connected to the tool base portion via the first joint portion, and the tool main body portion is connected to the other end portion of the power relay shaft portion via the second joint portion. From the above, the tool body can be tilted in any direction at two different tilt center points, and can be translated laterally of the rotation axis of the tool base, or the rotation axis of the tool base It can also be tilted in an arbitrary direction while being moved sideways. That is, the position and posture of the tool body can be changed more flexibly with respect to variations in workpiece shape and fixed position.

[Invention of Claim 10]
According to the invention of claim 10, since the first origin posture holding means for biasing the power relay shaft portion to the origin posture and the second origin posture holding means for biasing the tool body portion to the origin posture, these are provided. The tool main body can be pressed against the workpiece by the biasing force of the posture holding means.

[Invention of Claim 11]
According to the eleventh aspect of the present invention, the tool main body can be held at the origin posture regardless of the gravity, so that the degree of freedom in arranging the rotary tool with respect to the workpiece is improved.

[Invention of Claim 12]
The first joint portion according to the present invention may be a cardan joint, a Rzeppa joint, or the like, and is provided on one or the other of the tool base portion and the power relay shaft portion as in the invention of claim 12. A first fitting hole portion and a first fitting male portion that are fitted to each other, and formed on any one of the fitting surfaces of the first fitting male portion and the first fitting hole portion, along the circumferential direction thereof. A plurality of first protrusions that are evenly arranged, a first contacted part that is formed on the other fitting surface and contacts the plurality of first protrusions, and a first protrusion or a first contacted part A first contact curved surface that is formed on one of the surfaces and makes line contact or point contact between the first protrusion and the first contacted portion may be provided. The same applies to the second joint part.

  In this case, between the first spring support wall and the first positioning projection wall provided on one of the tool base and the power relay shaft, the first provided on the other of the tool base and the power relay shaft is provided. The first and second positioning projection walls are provided on the tool base by providing the first compression coil spring in a stretched state between the first spring supporting wall and the second positioning projection wall with the two positioning projection walls interposed therebetween. The power relay shaft portion can be positioned in the home position by abutting each other in the direction of the rotation axis of the portion. The same applies to the second joint part, and the tool body part can be positioned in the origin posture.

[Invention of Claim 13]
According to invention of Claim 13, a tool main-body part has a shaft part extended in the gravity-axis direction from the center of the disk part as a 4th positioning protrusion wall and a 2nd fitting male part, The workpiece can be ground or cut by pressing the grinding portion or the blade portion provided at the tip against the workpiece. Further, the disk portion is pressed against the third positioning protrusion wall of the power relay shaft portion by the second compression coil spring provided in a stretched state between the second spring support wall and the disk portion as the fourth positioning protrusion wall. As a result, the tool body is held in the original posture. Further, the tool main body portion is brought into a posture other than the original posture by tilting the disk portion as the fitting male portion inside the second fitting hole upon receiving a processing reaction force exceeding the urging force of the second compression coil spring. The load applied to the tool main body part and the fitting part between the second fitting hole part and the disk part can be suppressed.

The side view of the rotary tool which concerns on 1st Embodiment of this invention. Exploded view of rotating tool Side view of rotating tool Side sectional view of the rotary tool when the tool body is in a non-origin posture Side view of shaft (A) Plan view of tool body, (B) Side view of tool body (A) Plan view of spring support plate, (B) Side view of spring support plate View of the rotating rod as seen from the direction of the axis of rotation The partial expanded view of the cross section in the PP cut surface of FIG. (A) Top view of special wrench, (B) Side view of special wrench Skeleton diagram for explaining the gyro effect (A) Side sectional view of the rotary tool according to the second embodiment, (B) Partial enlarged view Sectional drawing in the QQ cut surface of FIG. Side sectional view of the rotary tool when the tool body is in a non-origin posture (A) Side sectional view of the rotary tool according to the third embodiment, (B) Partial enlarged view Sectional drawing of the RR cut surface in FIG. Side sectional view when the tool body is in a non-origin posture Side sectional view in the origin posture of the rotary tool according to the fourth embodiment Side sectional view of the rotary tool when the tool body is in a non-origin posture (A) Side cross-sectional view of the rotary tool when the tool body is in the home position, (B) Side cross-sectional view of the rotary tool when the tool body is in the non-home position (A) Side cross-sectional view of the rotary tool when the tool body is in the home position, (B) Side cross-sectional view of the rotary tool when the tool body is in the non-home position (A) Side cross-sectional view of the rotary tool when the tool body is in the home position, (B) Side cross-sectional view of the rotary tool when the tool body is in the non-home position

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an entire rotary tool 10 used by being attached to a workpiece machining apparatus (not shown). As shown in FIGS. 1 and 2, the rotary tool 10 includes a pair of tool body portions 20 each having a disk shape, and a rotating rod 30 penetrating through the center thereof (corresponding to the “tool base portion” of the present invention). And have. The rotation rod 30 is fixed to a rotation drive unit 300 (for example, a main shaft driven by a motor) provided in the workpiece machining apparatus, and the rotation rod 30 and the pair of tool body units 20 rotate integrally.

  As shown in FIG. 2, the rotating rod 30 has a cylindrical shape as a whole, and a shank portion 35 fixed to the rotation driving portion 300 is formed at one end portion in the axial direction, and positioning is performed at an intermediate portion in the axial direction. A protruding wall 31 is formed. The positioning projection wall 31 protrudes to the side of the rotating rod 30, and a pair of fitting male portions 32 projecting to the side smaller than the positioning projection wall 31 are formed at both side positions sandwiching the positioning projection wall 31. Has been. Moreover, the cylindrical part 33 is extended toward the both ends of the rotating rod 30 from a pair of fitting male part 32, and it is a male screw on the outer peripheral surface of the part away from the fitting male part 32 among these cylindrical parts 33. 33A (see FIG. 5) is formed.

  As shown in FIG. 3, a spring support plate 40 (corresponding to a “spring support wall” of the present invention) is attached to each cylindrical portion 33 of the rotating rod 30. The spring support disk 40 protrudes to the side of the rotating rod 30 so as to be larger than the positioning projection wall 31, and has a disk shape whose thickness gradually decreases as it moves away from the rotating rod 30 (towards the outer side in the radial direction). ing. Specifically, of the both side surfaces of the spring support plate 40, the side surface facing the both end sides of the rotating rod 30 is a flat surface orthogonal to the rotating rod 30, and the opposite side surface is separated from the rotating rod 30. Accordingly, it is an annular staircase surface stepwise away from the tool body 20 (see FIG. 7B). Further, the screw hole 40A passes through the maximum thick part 41 at the center of the spring support board 40, and the screw hole 40A is screwed with the male screw 33A of the cylindrical part 33.

  The spring support plate 40 is attached to the rotating rod 30 by using, for example, a special wrench 200 shown in FIG. 10, and a plurality of surfaces that are engaged with the special wrench 200 are engaged with the flat side surface of the spring support plate 40. An engagement hole 43 is formed. As shown in FIG. 7A, the engagement holes 43 are equally arranged on the same circumference concentric with the screw holes 40A. On the other hand, as shown in FIG. 10A, the special wrench 200 has a structure in which a pair of grips 202 protrude in opposite directions from the outer peripheral surface of the ring-shaped wrench main body 201. A plurality of engagement protrusions 203 (see FIG. 10B) protruding from the side surface can engage with the respective engagement holes 43 formed in the spring support board 40 in an uneven manner.

  As shown in FIG. 3, a cylindrical collar 11 is attached between the spring support plate 40 and the fitting male portion 32 in the column portion 33 of the rotating rod 30. The collar 11 is sandwiched between the maximum thickness portion 41 and the fitting male portion 32 of the spring support board 40, and movement in the direction of the rotating shaft 30J is prohibited.

  As shown in FIG. 3, the tool body 20 is attached to both side positions of the rotating rod 30 with the positioning projection wall 31 interposed therebetween. As shown in FIG. 6A, the tool body 20 includes an annular grinding part 21 on the outer edge part of the disk part 22. As shown in FIG. 3, the cross section of the grinding portion 21 has a substantially bowl shape, and abrasive grains are fixed to the outer peripheral surface curved in an arch shape.

  A fitting hole 23 is formed through the center of the tool main body 20 (disk portion 22). As shown in FIG. 2, the tool body 20 is inserted from both ends of the rotating rod 30, and the fitting male portion 32 of the rotating rod 30 is fitted in the fitting hole 23 (see FIG. 3). . Further, the annular ribs 24 erected from both side surfaces of the disk portion 22 form an annular shape having a larger diameter than the positioning projection wall 31, and the outer diameter of the annular rib 24 and the outside of the intermediate thick portion 44 in the spring support plate 40. The diameter is substantially the same diameter (see FIG. 3).

  As shown in FIG. 3, a compression coil spring 12 (corresponding to “origin posture holding means” of the present invention) is sandwiched between the spring support plate 40 and the tool main body 20 in a stretched state. The compression coil spring 12 is inserted into the outside of the cylindrical portion 33 of the rotating rod 30 in a loosely fitted state, and one end thereof is fitted inside the annular rib 24 formed in the tool main body portion 20, and the other end portion is It is abutted against the intermediate thick part 44 in the spring support board 40. The compression coil spring 12 presses one side surface of the tool main body 20 (the inner region of the annular rib 24 in the disk portion 22) against the side surface of the positioning projection wall 31 (see FIG. 3). Note that the preload of the compression coil spring 12 can be adjusted by changing the axial length of the collar 11 sandwiched between the spring support plate 40 and the fitting male portion 32.

  As shown in FIG. 3, a cover 13 is assembled between the spring support plate 40 and the tool body 20 so as to surround the compression coil spring 12. The cover 13 has a bellows tube structure, one end of which is fitted to the outside of the annular rib 24 of the tool body 20, and the other end is fitted to the outside of the intermediate thick portion 44 of the spring support board 40. ing.

  A cover 14 having a bellows tube structure is also sandwiched between the pair of tool main body portions 20, and both end portions of the cover 14 are fitted to the outside of the annular rib 24 of the tool main body portion 20. These covers 13 and 14 prevent foreign matters such as grinding scraps generated during the machining of the workpiece from biting into the “joint portion” of the present invention in which the tool main body portion 20 and the rotating rod 30 are connected.

  The joint portion has the positioning protrusion wall 31 described above and the fitting male portion 32 disposed on both sides of the positioning protrusion wall 31, the spring support disc 40, and the compression coil spring 12, and further has the following configuration. I have. As shown in FIG. 6 (A), the opening shape of the fitting hole portion 23 formed in the tool main body portion 20 is a regular polygon (specifically, a regular hexagon). The inner side surface 23 </ b> A corresponding to the side is a flat surface parallel to the center of gravity axis 20 </ b> J of the tool body 20. Further, the portions corresponding to the respective corners of the regular polygon are curled in an arc shape so as to be separated from the center of gravity axis 20J, and the inner side surface 23A corresponding to each side of the regular polygon protrudes relatively inwardly. It is the “projection” of the invention.

  On the other hand, the fitting male part 32 formed on the rotating rod 30 is a regular polygon (specifically, a regular hexagon) like the fitting hole 23 (see FIG. 8). The outer surface 32A corresponding to each side (corresponding to the “contact portion” of the present invention) is rounded so as to bulge outward as viewed from the direction orthogonal to the rotation axis 30J of the rotating rod 30. It is a tangent surface (see FIG. 5). Specifically, each outer surface 32A of the fitting male part 32 is a cylindrical curved surface centering on each reference axis that is orthogonal to the rotation axis 30J and parallel to each outer surface 32A, and is disposed at the opposite side position. The outer side surfaces 32A are positioned on the same cylindrical surface. Further, portions of the fitting male portion 32 corresponding to each corner of the regular polygon are chamfered.

  The compression coil spring 12 that is stretched between the tool main body 20 and the spring support plate 40 causes the tool main body 20 to face the side surface of the positioning protruding wall 31 regardless of the direction of the rotary shaft 30J of the rotary rod 30 with respect to the gravitational direction. Is held in a posture in which the center of gravity axis 20J of the tool body 20 and the rotation axis 30J of the rotary rod 30 coincide with each other. In this origin posture, each outer side surface 32A of the fitting male portion 32 makes line contact with each inner side surface 23A of the fitting hole portion 23 (see FIG. 9). As a result, the rotating rod 30 and the tool body 20 can be rotated at the same rotational speed. For example, a ring that makes line contact with all six inner surfaces of a cylinder having a regular hexagonal cross section is arranged in any direction within the cylinder. Each tool body 20 has an origin posture shown in FIG. 3 and any other posture (hereinafter referred to as “non-origin posture”), specifically, shown in FIG. As described above, it is possible to adopt a posture in which the center of gravity axis 20J of the tool main body 20 obliquely intersects with the rotation axis 30J of the rotating rod 30.

  The configuration of the rotary tool 10 of the present embodiment is as described above. When processing the workpiece W (for example, deburring) using the rotary tool 10, the workpiece W is fixed with a fixing jig (not shown), and the rotated rotary tool 10 is brought close to the workpiece W so that a pair of The grinding part 21 of the tool body 20 is pressed against the deburring part of the workpiece W. Since the tool main body 20 is biased to the origin posture by the gyro effect due to its rotation and the compression coil spring 12, the deburring portion is ground by the both grinding portions 21 provided in the pair of tool main bodies 20. Burrs are removed.

  Here, since the rotating rod 30 and the tool main body 20 are connected by the joint part described above, a machining reaction force exceeding the urging force (the compression coil spring 12 and the gyro effect) that urges the tool main body 20 to the origin posture. When the tool body 20 is received, the tool body 20 changes from the origin posture shown in FIG. 3 to the non-origin posture shown in FIG. 4, and rotates around the center of gravity axis 20J that does not coincide with the rotary shaft 30J while maintaining the non-origin posture. Then, the workpiece W is ground.

  Further, since the tool body 20 is biased to the origin posture by the compression coil spring 12, the grinding portion 21 of the tool body 20 that rotates around the center of gravity axis 20J while maintaining the non-origin posture is replaced with the compression coil spring 12. It can be pressed against the deburring part of the workpiece W by the urging force. That is, according to the present embodiment, the tool body 20 is changed to an arbitrary posture according to variations in the shape, fixed position, etc. of the workpiece W without fine adjustment of the position of the rotary tool 10, and these variations Grinding of the deburring portion can be reliably performed in a state where the water is absorbed. Thereby, it is possible to suppress the load applied to the fitting portion with the tool body 20 and the rotating rod 30 without reducing the processing efficiency.

  Further, since the tool body 20 is held at the origin posture (the state shown in FIG. 3) regardless of the direction of the rotating shaft 30J of the rotating rod 30 with respect to the direction of gravity, the degree of freedom in arranging the rotating tool 10 with respect to the workpiece is improved. .

  Note that even when the tool body 20 is in a non-origin posture (see FIG. 4) and rotates around the center of gravity axis 20J that does not coincide with the rotation axis 30J, the gyro that acts to maintain the rotation in the non-origin posture An effect occurs. This will be described with reference to the skeleton model shown in FIG. In this skeleton model, the shaft portion 1 (corresponding to the rotating shaft 30J) and the shaft portion 2 (corresponding to the center of gravity axis 20J) supported by the bearings 5 and 6 are connected by the constant velocity joint portion 3, and the shaft portion 2 The flywheel 4 (corresponding to the tool main body portion 20) is fixed. First, as shown in FIG. 11A, the shaft portion 1 is rotationally driven in a state where the shaft portions 1 and 2 are directed in the direction of gravity (corresponding to the origin posture), and the shaft portions 1 and 2 are rotated at the same rotational speed. When the shaft is rotated at a high speed, the shaft portions 1 and 2 are maintained in a matched state by the gyro effect caused by the rotation of the flywheel 4. Next, as shown in FIG. 2B, the bearing 6 supporting the shaft portion 2 is moved while maintaining the rotation of the shaft portions 1 and 2, and the shaft portion 2 is inclined with respect to the direction of gravity ( Corresponding to a non-origin posture). Then, since the posture of the shaft portion 2 that is the center of gravity axis is stabilized by the gyro effect due to the rotation of the flywheel 4, as shown in FIG. The shaft portion 2 is maintained in an inclined state with respect to the direction of gravity. Note that the rotary tool 10 of the present embodiment includes a compression coil spring 12 that biases the tool main body 20 to the origin posture, and the biasing force is larger than the gyro effect due to the rotation of the tool main body 20. The tool main body 20 does not rotate in a non-origin posture with the 10 separated from the workpiece.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 12 (A), the rotary tool 50 of this embodiment includes a tool base unit 70 that is attached to a rotation drive unit 300 of a workpiece machining apparatus (not shown) and is driven to rotate, and a workpiece that is pressed against the workpiece. The tool base part 70 and the tool main body part 60 are connected by the “joint part” according to the present invention.

  The tool body 60 is composed of a rod-shaped shaft portion 61 and a tilting member 62 fixed to the base end portion of the shaft portion 61, and a grinding portion 61 </ b> A for grinding a workpiece is provided at the distal end portion of the shaft portion 61. Is provided. In addition, you may make it the structure (what is called an end mill) provided with the blade part for cutting a workpiece | work instead of the grinding part 61A. The shaft portion 61 may be provided with a drill bit for drilling.

  The tilting member 62 has a hollow flange 63 that extends from the proximal end portion of the shaft portion 61 on its rearward extension line, and the proximal end of the shaft portion 61 is inserted into an insertion hole 63A that is open to the distal end surface of the flange portion 63. The part is inserted and fixed. In addition, a disk portion 64 is integrally formed at an intermediate portion in the axial direction of the flange portion 63. The disk part 64 protrudes to the side of the flange part 63 and has a flat plate shape orthogonal to the center of gravity axis 60J of the tool body part 60.

  The tool base part 70 has a hollow structure, and the whole of the tool base part 70 excluding the front end part is accommodated in the tool base part 70. The tool base portion 70 includes an outer fitting portion 71 having a cylindrical structure with both ends open, and a front lid member 73 (the first positioning protrusion of the present invention) sandwiching the outer fitting portion 71 from both sides in the axial direction. And a rear lid member 75, which are fastened together by a plurality of bolts 78. The inside of the outer fitting portion 71 is a fitting hole 72, and the disc portion 64 of the tilting member 62 is fitted into the fitting hole 72.

  The front lid member 73 has a disk shape, and a tilt allowing hole 73A is formed through the center portion thereof. The front lid member 73 faces the disk portion 64 from the front end side of the rotary tool 50, and the front end portion of the tilt member 62 (the flange portion 63) is inserted into the tilt allowance hole 73A in a loosely fitted state. In addition, a gap between the inner side surface of the tilting permissible hole 73 </ b> A and the outer side surface of the flange portion 63 is closed by the elastic ring 51. The elastic ring 51 allows the collar portion 63 to tilt inside the tilt allowing hole 73 </ b> A and prevents foreign matter (such as grinding dust) from entering the tool base portion 70.

  The rear cover member 75 stands rearward from the center of the disc-shaped rear wall 76 (corresponding to the “spring support wall” of the present invention) facing the disc portion 64 from the proximal end side of the rotary tool 50 and the rear wall 76. The shank portion 77 is integrally provided. Further, the shank portion 77 has a cylindrical structure communicating with the fitting hole portion 72 and closed at the rear end portion, and the proximal end side portion of the flange portion 63 of the tilting member 62 is loosely fitted inside thereof. Has been inserted. In addition, the shank part 77 is attached to the rotation drive part 300.

  A plurality of compression coil springs 52 are sandwiched between the disk portion 64 and the rear wall 76. These compression coil springs 52 are evenly arranged on the same circumference around the rotation shaft 70 </ b> J of the tool base portion 70. In addition, a plurality of circular recesses 64B and 76A that receive both ends of the compression coil spring 52 are recessed in the mutually opposing surfaces of the disk portion 64 and the rear wall 76 (see FIG. 12A).

  Now, the joint part connecting the tool main body part 60 and the tool base part 70 includes the fitting hole part 72 and the disk part 64 described above, and the front lid member 73 and the rear lid that sandwich the disk part 64 in the direction of the rotation axis 70J. It has the member 75, the compression coil spring 52 pinched | interposed between the back cover member 75 and the disc part 64, and also has the following structures.

  As shown in FIG. 13, the opening shape of the fitting hole portion 72 provided in the tool base portion 70 is a regular polygon (specifically, a regular octagon), and corresponds to each side of the polygon. The inner side surface 72A is a flat surface parallel to the rotation shaft 70J of the tool base portion 70. Further, the portions corresponding to the respective corners of the regular polygon are curled in an arc shape so as to be separated from the rotation shaft 70J, and the inner surface 72A corresponding to each side of the regular polygon protrudes relatively inward. Has become a department.

  On the other hand, the disk portion 64 formed on the tilting member 62 is a regular polygon (specifically, a regular octagon) similar to the fitting hole portion 72, and the outer surface corresponding to each side of the polygon. 64A is a contact curved surface that is rounded so as to bulge outward as viewed from a direction orthogonal to the center of gravity axis 60J of the tool body 60. Specifically, each outer surface 64A of the disk portion 64 has a cylindrical curved surface centered on each reference axis that is orthogonal to the center of gravity axis 60J of the tool body 60 and parallel to each outer surface 64A. Moreover, each outer side surface 64A inclines as a whole so that it may approach the gravity center axis | shaft 60J as it goes back (refer FIG. 12 (B)). Further, the outer side surfaces 64A arranged at opposite sides are located on the same cylindrical surface. Note that portions corresponding to the respective corners of the regular polygon of the disk portion 64 are chamfered.

  The compression coil spring 52 sandwiched between the rear wall 76 of the tool base portion 70 and the disk portion 64 of the tilting member 62 allows the tool body portion 60 to be independent of the direction of the rotation shaft 70J of the tool base portion 70 with respect to the direction of gravity. , The origin posture shown in FIG. That is, the center of gravity axis 60J of the tool main body 60 and the rotation axis 70J of the tool base 70 are held in a matching posture. Here, an annular protrusion 73 </ b> B is formed on a surface of the front lid member 73 that faces the disk portion 64. The annular protrusion 73B has an annular shape concentric with the tilting permissible hole 73A, and the surface facing the disk portion 64 is a curved surface. In the origin posture, the disk portion 64 and the annular ridge 73B are in line contact.

  Further, in the origin posture, each outer surface 64A of the disk portion 64 is in line contact with each inner surface 72A of the fitting hole portion 72 (see FIG. 13). As a result, the tool base 70 and the tool main body 60 can rotate at the same rotational speed, and the tool main body 60 has the origin posture and the non-origin posture other than the origin posture based on the same principle as the first embodiment. Specifically, as shown in FIG. 14, it is possible to take a posture in which the center of gravity axis 60J of the tool main body portion 60 obliquely intersects with the rotation shaft 70J of the tool base portion 70. In addition, when it becomes a non-origin posture, the disk portion 64 and the annular protrusion 73B change from a line contact state to a point contact state.

  The configuration of the rotary tool 50 of the present embodiment is as described above. When processing the workpiece W (for example, deburring) using the rotary tool 50, the workpiece W is fixed with a fixing jig (not shown), and the rotated rotary tool 50 is brought close to the workpiece W to obtain a tool body. The grinding part 61A provided at the tip of 60 is pressed against the deburring part of the workpiece W. Since the tool main body 60 is biased to the origin posture by the gyro effect due to its rotation and the compression coil spring 52, the deburring portion is ground by the grinding part 61A provided in the tool main body 60 to remove the burrs. The

  Here, since the tool main body 60 and the tool base 70 are connected by the joint portion described above, a machining reaction force that exceeds the force (the compression coil spring 52 and the gyro effect) that urges the tool main body 60 to the home position. Upon receipt, the tool body 60 is changed from the origin posture (see FIG. 12A) to the non-origin posture (see FIG. 14), and rotates around the center of gravity axis 60J while maintaining the non-origin posture. To grind the workpiece W.

  Further, since the tool main body 60 is biased to the origin posture by the compression coil spring 52, the grinding portion 61A of the tool main body 60 that rotates around the center of gravity axis 60J while maintaining the non-origin posture is the burrs of the workpiece W. Pressed against the picking point. That is, according to the present embodiment, the tool body 60 is changed to an arbitrary posture in accordance with the variation of the shape of the work W, the fixed position, etc. without fine adjustment of the position of the rotary tool 50, and the variation Grinding of the deburring portion can be reliably performed in a state where the water is absorbed. Thereby, it is possible to suppress the load applied to the connecting portion with the tool main body 60 and the tool base 70 without reducing the processing efficiency.

  As shown in FIG. 14, even when the tool main body 60 is in the non-origin posture and rotates around the center of gravity axis 60J that does not coincide with the rotation axis 70J, a gyro effect that tries to maintain the non-origin posture occurs. However, since the urging force of the compression coil spring 52 is larger than the gyro effect, the tool body 60 is returned to the home position when the rotary tool 50 is separated from the workpiece W.

[Third Embodiment]
15 to 17 show a rotary tool 80 according to the third embodiment of the present invention. Similar to the second embodiment, the rotary tool 80 of the present embodiment includes a tool base portion 81 and a tool main body portion 90, which are connected by a “joint portion” according to the present invention. The tool main body 90 includes a shaft 61 having the same structure as that of the second embodiment and a tilting member 91 having a structure different from that of the second embodiment. Hereinafter, the configuration different from that of the second embodiment will be described, and the same configuration as that of the second embodiment is denoted by the same reference numeral, and redundant description is omitted.

  The tilt member 91 of the tool main body 90 has a cylindrical structure extending rearward from the base end portion of the shaft portion 61, and the base of the shaft portion 61 is inserted into the insertion hole 91 </ b> A opened in the distal end surface of the tilt member 91. The end is inserted and fixed. In addition, a disc portion 92 that protrudes like a bowl from the outer peripheral surface is formed at the axial intermediate portion of the tilting member 91. Of the tilting member 91, the rear half 93 behind the disk portion 92 is tapered, and a flat washer 95 fitted to the outside of the rear half 93 is directed to the rear surface of the disk portion 92.

  The tool base portion 81 has a cylindrical structure with an open front end extending rearward from the base end portion of the tool main body portion 90, and a tilting member 91 is received inside the tool base portion 81. The tool base 81 includes a ring-shaped outer fitting portion 82 disposed at a position near the tip thereof, sandwiched between the retaining ring 84 and the cylindrical main body 85 from both sides in the axial direction, and the outer fitting portion 82 and the retaining portion. The ring 84 and the cylindrical main body 85 are configured to be fastened together with a plurality of bolts 78. Inside the outer fitting portion 82 and the retaining ring 84 are a fitting hole portion 83 and a tilting permissible hole 84A, respectively, and the tilting permissible hole 84A has a smaller diameter than the fitting hole portion 83.

  The disc portion 92 of the tilting member 91 is fitted in the fitting hole portion 83. Further, the front end portion of the tilting member 91 is inserted in the tilt allowing hole 84A in a loosely fitted state, and a gap between the outer peripheral surface of the tilting member 91 and the inner peripheral surface of the tilt allowing hole 84A is formed by the elastic ring 86. It is blocked. The elastic ring 86 allows the tilting member 91 to tilt inside the tilt allowing hole 84 </ b> A and prevents foreign matter (such as grinding dust) from entering the tool base 81.

  A spring receiving member 87 (corresponding to the “spring support wall” of the present invention) and a compression coil spring 88 are accommodated inside the tool base portion 81 (tubular body 85). The compression coil spring 88 is loosely fitted to the outside of the rear half portion 93 of the tilting member 91. The spring receiving member 87 is disposed behind the compression coil spring 88 and can move directly in the direction of the rotation shaft 81J of the tool base 81.

  The spring receiving member 87 has a bottomed cylindrical structure in which the base end portion of the tilting member 91 is received in a loosely fitted state. The spring receiving member 87 includes a cylindrical wall 87A and a flat washer 95 addressed to the rear surface of the disk portion 92. The compression coil spring 88 is stretched between them. Further, a set screw 89 penetrating the rear end wall of the tool base portion 81 (tubular body 81) is abutted against the bottom wall 87B of the spring receiving member 87, and the spring receiving member is engaged by a screwing operation of the set screw 89. It is possible to arbitrarily adjust the preload of the compression coil spring 88 by moving 87 directly.

  Now, the joint part connecting the tool body 60 and the tool base part 81 includes a fitting hole part 83 and a disk part 92, a retaining ring 84 and a spring receiving member 87 sandwiching the disk part 92 in the direction of the rotation axis 81J. The compression coil spring 88 is sandwiched between the spring receiving member 87 and the disk portion 92, and further includes the following configuration.

  As shown in FIG. 16, the opening shape of the fitting hole portion 83 formed in the tool base portion 81 is a regular polygon (specifically, a regular hexagon), and corresponds to each side of the polygon. An inner side surface 83 </ b> A of the fitting hole portion 83 is a flat surface parallel to the rotation shaft 81 </ b> J of the tool base portion 81. Further, the portions corresponding to the respective corners of the regular polygon are curled in an arc shape so as to be separated from the rotation shaft 81J, and the inner surface 83A corresponding to each side of the regular polygon protrudes relatively inward. It has become.

  On the other hand, the disk portion 92 formed on the tilting member 91 is a regular polygon (specifically, a regular hexagon) like the fitting hole portion 83, and the outer surface corresponding to each side of the polygon. 92A is a contact curved surface that is rounded so as to bulge outward as seen from a direction orthogonal to the center of gravity axis 90J of the tool body 90. Specifically, as shown in FIG. 15B, each outer surface 92A of the disk portion 92 is centered on each reference axis that is orthogonal to the center of gravity axis 90J of the tool body 90 and parallel to each outer surface 92A. It has a cylindrical curved surface and is inclined overall so as to approach the center of gravity axis 90J as it goes rearward. Further, the outer surfaces 92A arranged at opposite sides are located on the same cylindrical surface. The portions corresponding to the respective corners of the regular polygon of the disk portion 92 are chamfered.

  The compression coil spring 88 holds the tool main body 90 in the origin posture shown in FIG. 15A regardless of the direction of the rotation shaft 81J of the tool base 81 with respect to the direction of gravity. In other words, the center of gravity axis 90J of the tool main body 90 and the rotating shaft 81J of the tool base 81 are held in a matching posture. Here, an annular protrusion 84B (see FIG. 15B) protruding toward the disk portion 92 is formed at the opening edge of the tilting permissible hole 84A in the retaining ring 84. The surface of the annular ridge 84B facing the disk portion 92 is a curved surface, and the disk portion 92 and the annular ridge 84B are in line contact with each other in the origin posture.

  Further, in the origin posture, each outer surface 92A of the disk portion 92 is in line contact with each inner surface 83A of the fitting hole portion 83 (see FIG. 16). As a result, the tool base portion 81 and the tool main body 90 can be rotated at the same rotational speed, and the tool main body 90 has an origin posture and other non-origin postures, specifically based on the same principle as in the second embodiment. Specifically, as shown in FIG. 17, it is possible to take a posture in which the center of gravity axis 90J of the tool main body 90 obliquely intersects with the rotation shaft 81J of the tool base 81. When the non-origin posture is reached, the disk portion 92 and the annular protrusion 84B change from a line contact state to a point contact state. Also according to the present embodiment, the same effects as those of the second embodiment are achieved.

[Fourth Embodiment]
18 and 19 show a rotary tool 100 according to a fourth embodiment of the present invention. In the rotary tool 100, a rotary base portion 70 and a tool main body 90 are connected via a power relay shaft portion 110, and a base end portion of the power relay shaft portion 110 and the tool base portion 70 are connected to a first joint. The tip of the power relay shaft 110 and the tool main body 90 are connected by the second joint portion. The first joint portion has the same structure as that provided in the rotary tool 50 of the second embodiment, and the second joint portion has substantially the same structure as that provided in the rotary tool 80 of the third embodiment. It has become. Hereinafter, the same configurations as those of the second embodiment and the third embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The power relay shaft portion 110 includes a body portion 111 that protrudes from the center of the front surface of the disk portion 64 toward the center of gravity axis 110J. The body portion 111 has a cylindrical shape with an open front end, and the tilt member 91 is received inside the body portion 111. Inside the body portion 111, a tilt allowing hole 84A, a fitting hole portion 83, a medium diameter hole portion 115A, and a small diameter hole portion 115B are formed in this order from the tip side.

  The body portion 111 has a configuration in which the outer fitting portion 82 disposed near the tip is sandwiched between the cylindrical portion 115 and the retaining ring 84 from the axial direction, and these are fastened together with a plurality of bolts 78. . Inside the cylindrical portion 115, the above-described medium diameter hole portion 115A and small diameter hole portion 115B are formed.

  The compression coil spring 88 loosely fitted to the outside of the rear half portion 93 of the tilting member 91 is accommodated in the medium diameter hole portion 115A of the cylindrical portion 115, and is formed between the medium diameter hole portion 115A and the small diameter hole portion 115B. The stepped portion 115 </ b> C and the flat washer 95 addressed to the rear surface of the disk portion 92 are stretched.

  With the compression coil spring 52 provided in the first joint portion and the compression coil spring 88 provided in the second joint portion, the tool main body portion 90 can be used regardless of the direction of the rotation shaft 70J of the tool base portion 70 with respect to the direction of gravity. The origin posture shown in FIG. In other words, the center of gravity axis 90J of the tool main body 90, the center of gravity axis 110J of the power relay shaft 110, and the rotation axis 70J of the tool base 70 are held in the same posture.

  According to the present embodiment, as in the above-described embodiment, the tool main body 90 is changed to an arbitrary posture in accordance with variations in the shape and fixed position of the workpiece, and the workpiece is processed (grinding) in a state where these variations are absorbed Can be performed reliably. Further, the tool base portion 70 and the base end portion of the power relay shaft portion 110 are connected by the first joint portion, and the distal end portion of the power relay shaft portion 110 and the tool body portion 90 are connected by the second joint portion. Therefore, the tool main body 90 can be tilted in any direction at two different tilting center points, and can be translated to the side of the rotating shaft 70J of the tool base 70. The part 70 can be tilted in an arbitrary direction while being moved to the side of the rotation shaft 70J. That is, the position and posture of the tool main body 90 can be changed more flexibly with respect to variations in the workpiece shape, fixed position, etc., and the load applied to the connecting portion with the tool main body 90 and the tool base 70 can be more reliably Can be suppressed.

  Of the first joint portions in the present embodiment, the fitting hole portion 72 corresponds to the “first fitting hole portion” of the present invention, and the disk portion 64 is the “first fitting male portion” of the present invention. This corresponds to a “second positioning projection wall”. Each inner side surface 72A of the fitting hole 72 corresponds to the “first protrusion” and the “first contact curved surface” of the present invention, and the outer surface 64A of the disk portion 64 corresponds to the “first contact” of the present invention. Corresponds to “contact part”. The front lid member 73 corresponds to the “first positioning protrusion wall” of the present invention, and the rear wall 76 of the rear cover member 75 corresponds to the “first spring support wall” of the present invention. The compression coil spring 52 corresponds to the “first compression coil spring” of the present invention.

  Further, among the second joint portions in the present embodiment, the fitting hole portion 83 corresponds to the “second fitting hole portion” of the present invention, and the disk portion 92 is the “second fitting male portion” of the present invention. This corresponds to a “fourth positioning protrusion wall”. Each inner side surface 83A of the fitting hole 83 corresponds to the “second protrusion” and “second contact curved surface” of the present invention, and the outer surface 92A of the disk portion 92 corresponds to the “second contact surface” of the present invention. Corresponds to “contact part”. The retaining ring 84 corresponds to the “third positioning protrusion wall” of the present invention, and the step portion 115C between the medium diameter hole portion 115A and the small diameter hole portion 115B is the “second spring support wall” of the present invention. Equivalent to. The compression coil spring 88 corresponds to the “second compression coil spring” of the present invention.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) In the first embodiment, the two tool main body portions 20 are attached to the rotating rod 30, but a configuration including three or more tool main body portions 20 may be employed. Moreover, you may make it the structure provided with only the tool main-body part 20 like the rotary tool 130 shown in FIGS.

  (2) The tool body 20 in this case may have a configuration in which grinding portions 21 are provided on outer edge portions on both side surfaces in the direction of the center of gravity axis 20J (see FIG. 20), or the center of gravity axis extends from the outer edge portion of the disk portion 22. The extended cylindrical part 25 extending in the 20J direction may be provided, and the extended cylindrical part 25 may be configured to include the grinding part 21 on the outer peripheral surface (or inner peripheral surface) of the extended cylindrical part 25 (see FIG. 21). It is also possible to employ a configuration in which a grinding part 21 is provided on the front end surface (see FIG. 22).

  20 to 22 is an elastic ring, and is sandwiched between the flange wall 31A protruding from the outer peripheral surface of the positioning projection wall 31 and the side surface of the disk portion 22 of the tool body portion 20. . The elastic ring 15 and the cover 13 can prevent foreign matter (grinding waste or the like) from entering the joint portion connecting the tool body 20 and the rotating rod 30.

  (2) In the second to fourth embodiments, the compression coil spring 52 is held in a stretched state between the rear wall 76 disposed rearward of the disk portion 64 and the disk portion 64. A configuration may be adopted in which the compression coil spring 52 is sandwiched between the front lid member 73 disposed in front and the disk portion 64. In this case, the front lid member 73 corresponds to the “spring support wall” of the present invention, and the rear wall 76 corresponds to the “first positioning protrusion wall” of the present invention.

  (3) In the above-described embodiment, each outer surface of the regular polygon in the fitting male part 32 and the disk parts 64 and 92 is constituted by a cylindrical curved surface centering on each reference axis parallel to the outer surface, The fitting hole portions 23, 72, 83 are configured so as to be in line contact with the respective inner surfaces of the regular polygon, but the protrusions having spherical surfaces from the outer surfaces of the fitting male portion 32 and the disk portions 64, 92. By projecting the portions, the protrusions and the inner side surfaces of the fitting hole portions 23, 72, 83 may be configured to make point contact.

  (4) The joint part connecting the tool body part and the tool base part is not limited to the configuration as in the first to fourth embodiments, and may be a cardan joint or a Rzeppa joint, for example.

  (5) In the above-described embodiment, the tool main body 20, 60, 90 is biased to the home position regardless of the direction of the rotary rod 30 and the rotary shafts 30J, 70J, 81J of the tool bases 70, 81 with respect to the direction of gravity. Although the compression coil springs 12, 52, 88 as the origin posture holding means are provided, the tool main body portion is used when the rotary rod 30 and the rotary shafts 30J, 70J, 81J of the tool base portions 70, 81 are used in the vertical direction. Since 20, 60, 90 can be urged to the origin posture by gravity, the compression coil spring may be omitted.

10, 50, 80, 100, 130 Rotating tool 12, 52, 88 Compression coil spring (origin posture holding means)
20, 60, 90 Tool body part 21, 61A Grinding part 22 Disk part 23, 72, 83 Fitting hole part 25 Expanded cylindrical part 30 Rotating rod (tool base part)
31 positioning protrusion (first positioning protrusion)
32 Mating male part 40 Spring support board (spring support wall)
61 Shaft portion 64 Disc portion (first fitting male portion, second positioning projection wall)
70, 81 Tool base portion 73 Front cover member (first positioning projection wall)
76 Rear wall (spring support wall)
84 Retaining ring (third positioning projection wall)
87 Spring receiving member 92 Disc part (second fitting male part, fourth positioning projection wall)
110 Power relay shaft 30J, 70J, 81J Rotary shaft 20J, 60J, 90J Center of gravity axis

Claims (13)

A tool base attached to the rotational drive and rotationally driven;
A tool body that is pressed against the workpiece and processes the workpiece;
The tool base portion and the tool main body portion are connected so that the tool main body portion rotates at the same rotational speed as the tool base portion, and the center of gravity axis of the tool main body portion is a rotation axis of the tool base portion. A rotating tool comprising: a joint portion that allows a change to an arbitrary posture including an origin posture that coincides with and that prohibits separation of the tool base portion and the tool main body portion.   The rotary tool according to claim 1, further comprising an origin posture holding means provided between the tool base portion and the tool body portion and biasing the tool body portion to the origin posture.   The rotary tool according to claim 2, further comprising the origin posture holding means capable of holding the tool main body portion at the origin posture regardless of a direction of a rotation axis of the tool base portion with respect to a gravitational direction. In the joint part,
A fitting hole part and a fitting male part which are provided on one and the other of the tool body part and the tool base part and fit to each other;
A plurality of protrusions formed on either one of the fitting surfaces of the fitting male part and the fitting hole part and arranged uniformly along the circumferential direction;
A contacted portion that is formed on the other fitting surface and contacts the plurality of protrusions;
An abutting curved surface formed on one of the projecting part or the contacted part and bringing the projecting part and the contacted part into line contact or point contact;
First and second tools are provided on one and the other of the tool main body and the tool base, and abut on each other in the rotation axis direction of the tool base to position the tool main body so as to be in the origin posture. A second positioning projection wall;
A spring support wall provided on a side having the first positioning projection wall of the tool main body and the tool base portion and facing the second positioning projection wall from the side opposite to the first positioning projection wall When,
The compression coil spring as the origin posture holding means provided in a stretched state between the spring support wall and the second positioning projection wall is provided. Rotary tool. The tool main body part has a structure having a grinding part for grinding a workpiece on the outer edge part of the disk part as the second positioning protrusion wall, and includes the fitting hole part at the center of the disk part,
The said tool base part is provided with the said 1st positioning protrusion wall and the said spring support wall which have the said fitting male part, and oppose on both sides of the said fitting male part. The described rotary tool.   The tool base portion includes a pair of fitting male portions fitted in the fitting hole portions of the pair of tool main body portions arranged coaxially, and is common between the pair of tool main body portions. The first positioning projection wall, a pair of spring support walls facing each of the tool body portions from the opposite side of the first positioning projection wall, and each of the tool body portions are connected to the first positioning projection wall. The rotary tool according to claim 5, comprising a pair of compression coil springs pressed against a wall. The tool main body has an extended cylindrical portion extending in the direction of the center of gravity axis from the outer edge of the disk portion as the second positioning projection wall, and a work piece is provided on the outer peripheral surface, inner peripheral surface, or tip surface of the cylindrical portion. And having a structure having a grinding part for grinding, and provided with the fitting hole in the center of the disk part,
The said tool base part is provided with the said 1st positioning protrusion wall and the said spring support wall which have the said fitting male part, and oppose on both sides of the said fitting male part. The described rotary tool. The tool main body portion has a shaft portion extending in the direction of the center of gravity axis from the center of the disk portion as the second positioning protrusion wall and the fitting male portion, and processes a workpiece at a tip portion of the shaft portion. A structure having a grinding part or blade part for
The said tool base part is provided with the said 1st positioning protrusion wall and the said spring support wall which have the said fitting hole part, and oppose on both sides of the said disk part. Rotary tool. A tool base attached to the rotational drive and rotationally driven;
A tool body that is pressed against the workpiece and processes the workpiece;
A power relay shaft that transmits rotational power from the tool base to the tool body;
The tool base portion and one end of the power relay shaft portion are connected so that the power relay shaft portion rotates at the same rotational speed as the tool base portion, and the center of gravity axis of the power relay shaft portion is the tool. A first joint portion that allows a change to an arbitrary posture including an origin posture that coincides with the rotation axis of the base portion and prohibits separation of the tool base portion and the tool main body portion;
The tool body is connected between the other end of the power relay shaft and the tool body so that the tool body rotates at the same rotational speed as the power relay shaft, and the center of gravity axis of the tool body is A second joint portion that allows a change to an arbitrary posture including an origin posture that coincides with the center of gravity axis of the power relay shaft portion and prohibits separation of the power relay shaft portion and the tool body portion; A rotating tool characterized by that. A first origin posture holding means provided between the tool base portion and the power relay shaft portion and biasing the power relay shaft portion to the origin posture;
The second origin posture holding means that is provided between the power relay shaft portion and the tool body portion and biases the tool body portion to the origin posture. Rotating tool.   The first and second origin posture holding means capable of holding the tool body portion and the tool body portion at the origin posture regardless of the direction of the rotation axis of the tool base portion with respect to the direction of gravity. The rotary tool according to claim 10. In the first joint part,
A first fitting hole portion and a first fitting male portion which are provided on one and the other of the tool base portion and the power relay shaft portion and are fitted to each other;
A plurality of first protrusions that are formed on any one of the fitting surfaces of the first fitting male part and the first fitting hole part and are equally arranged along the circumferential direction;
A first contacted portion formed on the other fitting surface and in contact with the plurality of first protrusions;
A first abutting curved surface formed on one of the first projecting part or the first abutted part and bringing the first projecting part and the first abutted part into line contact or point contact;
Provided on one and the other of the tool base part and the power relay shaft part, abut against each other in the direction of the rotation axis of the tool base part, and position the power relay shaft part in the origin posture First and second positioning projection walls;
First provided on the side having the first positioning projection wall of the tool base portion and the power relay shaft portion and facing the second positioning projection wall from the side opposite to the first positioning projection wall. A spring support wall;
A first compression coil spring as the first origin posture holding means provided in a stretched state between the first spring support wall and the second positioning projection wall;
In the second joint part,
A second fitting hole portion and a second fitting male portion that are provided on one and the other of the power relay shaft portion and the tool main body portion and fit to each other;
A plurality of second protrusions that are formed on any one of the fitting surfaces of the second fitting male part and the second fitting hole part and are arranged uniformly along the circumferential direction;
A second abutted portion formed on the other fitting surface and in contact with the plurality of second protrusions;
A second abutting curved surface formed on one of the second projecting part or the second abutted part and bringing the second projecting part and the second abutted part into line contact or point contact;
Provided on one and the other of the power relay shaft portion and the tool main body portion, and abut against each other in the direction of the rotation axis of the power relay shaft portion, and position the power relay shaft portion in the origin posture Third and fourth positioning projection walls that
Second of the power relay shaft portion and the tool main body portion that is provided on the side having the third positioning projection wall and faces the fourth positioning projection wall from the side opposite to the third positioning projection wall. A spring support wall;
The second compression coil spring as the second origin posture holding means provided in a stretched state between the second spring support wall and the fourth positioning projection wall. The rotary tool according to claim 1. The tool main body portion has a shaft portion extending in the direction of the center of gravity axis from the center of the disk portion as the fourth positioning protruding wall and the second fitting male portion, and a workpiece is placed on the tip portion of the shaft portion. It has a structure with a grinding part or blade part for processing,
The power relay shaft portion includes the second positioning hole and the second spring support wall that have the second fitting hole portion and are opposed to each other with the disk portion interposed therebetween. Item 13. The rotary tool according to Item 12.

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