TW201900311A - Inverted-tooth rotary knife comprising a body and at least one cutting member - Google Patents

Abstract

An inverted-tooth rotary knife of the present invention comprises a body and at least one cutting member, wherein the body is rotatable about a rotational axis as the center, the body forms a connecting end at one end along the axial direction of the rotational axis and forms a working end at the other end, the body is concavely provided with a cutting space at the working end along the axial direction of the rotational axis, and the cutting space extends from the working end toward the connecting end. At least one cutting member is fixedly coupled to the inner wall surface of the cutting space of the body by welding manner, at least one cutting member is provided with at least one cutting edge, the cutting member has a virtual reference plane in the radial direction of the rotational axis, the virtual reference plane is perpendicular to the rotating axis and passes through the cutting edge. On the virtual reference plane, the distance from the cutting edge to the rotating axis is smaller than the distance from arbitrary point on the inner wall surface of one side of the body adjacent to the cutting space to the rotational axis. The cost of the rotary knife is reduced by the above described structure.

Description

Reverse tooth rotary knife

The invention mainly discloses a rotary knife, in particular an inverted tooth rotary knife.

Please refer to the patent of "Inverted Rotary Knife" of the Japanese Patent No. I572433, which is an inverted tooth rotary cutter including a body which can rotate around a rotating shaft, and the body forms a connection along one end of the rotating shaft axial direction. The working end is formed at the other end of the opposite end, and the working body is concavely disposed with a cutting space in the axial direction of the rotating shaft at the working end. The cutting space extends from the working end to the connecting end, and the body is adjacent to the side of the cutting space. The wall surface is provided with at least one cutting edge, the body has a virtual reference plane in the radial direction of the rotating shaft, the virtual reference plane is perpendicular to the rotating shaft and passes through the cutting edge. On the virtual reference plane, the distance from the cutting edge to the rotating shaft is smaller than the adjacent cutting space of the body The distance from any point on the inner wall of one side to the axis of rotation.

However, with the inverted rotary knife of the above structure, the cutting edge is an integrally formed design, in other words, the inverted rotary cutter is entirely of the same material, and the condition of the above-mentioned inverted rotary knife is used because the thread at the end of the screw is used. Damaged and unable to smoothly pull the nut, in general, in order to solve the above problems, the cutter will be used to re-cut the thread at the end of the screw, unless the screw is seriously damaged or the screw hardness is too high and the needle is not easy to be twisted. The above-mentioned inverted tooth rotary knife will be used to directly cut all the damaged parts. Therefore, the inverted tooth rotary knife needs to be made of a high hardness metal material, but if the inverted tooth rotary knife is entirely made of a high hardness metal material, The cost of the inverted tooth rotary knife is increased.

In view of the above-described deficiencies in the conventional structure, the inventors have devised an inverted tooth rotary knife which overcomes all of the disadvantages of the above-described conventional structure.

The main purpose of the inverted tooth rotary knife of the present invention is to provide a rotary cutter comprising a body and at least one cutting member, the body being rotatable about a rotation axis, the body forming a connection along one end of the rotation axis Forming a working end at the other end of the opposite end, the body is recessed in the axial direction of the rotating shaft with a cutting space extending from the working end toward the connecting end, the at least one The cutting member is fixedly coupled to the inner wall surface of the body cutting space by welding, the at least one cutting member is provided with at least one cutting edge, the cutting member has a virtual reference surface along a radial direction of the rotating shaft, the virtual reference surface is perpendicular to the Rotating the shaft and passing the cutting edge, the distance from the cutting edge to the rotating shaft on the virtual reference surface is smaller than the distance from the arbitrary side of the inner wall surface of the body adjacent to the cutting space to the rotating shaft, and the cutting member can High-hardness metal is used to cut high-hardness screws, but the rotating knives mainly have only high-hardness metal parts, so that the rotary knives This inexpensive.

The width of the cutting space along the radial direction of the rotating shaft is tapered from the working end toward the connecting end to form a tapered space.

The at least one cutting edge extends along an axial direction of a virtual extension line that intersects the axis of rotation and forms an included angle of less than 90 degrees adjacent the side of the working end.

The inner wall surface of the body adjacent to the cutting space is disposed at least one chip flute along a radial direction of the rotating shaft, and one end of the chip flute and the cutting space communicate with each other and are different from one end of the cutting space. The body is in communication with the outside, the number of the at least one chip flute is the same as the number of the at least one cutting edge, and the at least one chip flute corresponds to the at least one cutting edge, the chip flute being located at the cutting edge The front surface extends in a direction parallel to the axial direction of the virtual extension line and is adjacent to the cutting edge.

The long side of the chip flute is provided with two side walls which are opposite each other, the cutting edge being located between the two side walls to a virtual extension surface extending adjacent to the cutting space.

The inner wall surface of the body adjacent to the cutting space is disposed at least one positioning groove along a radial direction of the rotating shaft, the number of the at least one positioning groove being the same as the number of the at least one chip flute, the at least one positioning The grooves respectively correspond to the at least one chip flute, the at least one positioning groove and the at least one chip flute being adjacent to each other, and the at least one cutting member is fixedly coupled to the at least one positioning groove by welding.

The number of the at least one cutting member is four, and the four cutting members are evenly distributed on the inner wall surface of the body cutting space centering on the rotating shaft.

Other objects, advantages and novel features of the invention will become apparent from the description and appended claims.

The present invention has been described with respect to the preferred embodiments and the accompanying drawings, which are intended to be illustrative only, and are not limited by the structure.

1 to 4 are a perspective view, a perspective exploded view, a cross-sectional structural view in the radial direction of the rotating shaft, and a sectional structural view in the axial direction of the rotating shaft in the first embodiment of the inverted tooth rotating blade of the present invention. The rotary knife 10 of the present invention comprises a body 20 and at least one cutting member 30; wherein:

The body 20 is rotatable about a rotation axis C. The body 20 forms a connection end 21 along one end of the rotation axis C and forms a working end 22 at the other end. The connection end 21 can be connected to a power tool or a pneumatic tool, the body 20 is recessed in the axial direction of the rotating shaft C at the working end 22 with a cutting space 23 extending from the working end 22 toward the connecting end 21, the cutting The width of the space 23 in the radial direction of the rotation axis C is tapered by the working end 22 toward the connecting end 21 to form a tapered space.

The inner wall surface of the body 20 adjacent to the side of the cutting space 23 is provided with at least one chip flute 24 in the radial direction of the rotating shaft C. One end of the chip flute 24 and the cutting space 23 communicate with each other and are different from each other. One end of the cutting space 23 penetrates the body 20 and communicates with the outside.

The at least one cutting member 30 is fixedly coupled to the inner wall surface of the cutting space 23 of the body 20, and the at least one cutting member 30 is provided with at least one cutting edge 31 extending along an axial direction of a virtual extension line L. The line L and the axis of rotation C intersect each other and form an angle of less than 90 degrees on a side adjacent to the working end 22.

The cutting member 30 has a virtual reference plane P along the radial direction of the rotation axis C. The virtual reference plane P is perpendicular to the rotation axis C and passes through the cutting edge 31. On the virtual reference plane P, the cutting edge 31 to the The distance of the rotation axis C is smaller than the distance from the arbitrary point of the inner wall surface of the body 20 adjacent to the cutting space 23 to the rotation axis C.

The number of the at least one chip flute 24 is the same as the number of the at least one cutting edge 31, and the at least one chip flute 24 corresponds to the at least one cutting edge 31, and the chip flute 24 is located on the front side of the cutting edge 31 and Extending in a direction parallel to the axial direction of the virtual extension line L and adjacent to the cutting edge 31, the long side of the chip flute 24 is provided with two side walls 241 which are opposite to each other, and the cutting edge 31 is located The two side walls 241 are between the virtual extension faces extending in the direction of the cutting space 23. The number of the at least one cutting member 30 in the present embodiment is four, and the four cutting members 30 are evenly distributed on the inner wall surface of the cutting space 23 of the body 20 centering on the rotation axis C.

Please refer to FIG. 5 again, which is a use state diagram of the first embodiment of the inverted tooth rotary knife of the present invention. When the rotary blade 10 is in use, the connection end 21 can be connected to the driving tool 90 and the end of the bolt 91 can be sheathed by the cutting space 23. After the driving tool 90 drives the rotary blade 10 to rotate, the cutting member 30 can bolt The thread of the end of the 91 is shortened or cut off, so that the nut is easily screwed to the bolt 91.

Since the cutting member 30 is coupled to the body 20 by welding, the cutting member 30 can be made of a different material than the body 20. Generally, the cutting member 30 uses a metal having a higher hardness than the body 20, so that the cutting member 30 can be used. The rotary cutter 10 is capable of cutting a screw having a high hardness. Although the high hardness metal is expensive, the rotary cutter 10 has only a portion of the cutter 30 which is a high hardness metal, so that the rotary cutter 10 is made of a high hardness metal as a whole. The tool is still relatively inexpensive. Moreover, the rotary blade 10 utilizes the above structure such that only the cutting edge 31 contacts the bolt 91 during the rotation, ensuring smooth cutting process without excessive resistance, and the chip after cutting can be passed by the chip removal groove 24 discharge.

Referring to Figures 6 and 7, a perspective view of a second embodiment of the inverted tooth rotary cutter of the present invention and a cross-sectional structural view along the axial direction of the rotary shaft are shown. The body 20a is provided with at least one positioning groove 25a along the radial direction of the rotating shaft C on the inner wall surface adjacent to the cutting space 23a, the number of the at least one positioning groove 25a and the number of the at least one chip flute 24a. Similarly, the at least one positioning groove 25a respectively corresponds to the at least one chip flute 24a, the at least one positioning groove 25a and the at least one chip flute 24a are adjacent to each other, and the at least one cutting piece 30a is fixedly welded by welding. And at least one positioning groove 25a.

As far as the above is concerned, it can be concluded that the present invention has the following advantages:

1. The inverting rotary knife of the present invention, wherein the rotary blade comprises a body and at least one cutting member, the body being rotatable about a rotation axis, the body forming a connection end along an axial end of the rotation axis The other end of the opposite end forms a working end, and the body is recessed in the axial direction of the rotating shaft with a cutting space extending from the working end toward the connecting end, and the at least one cutting piece is a welding method fixedly coupled to an inner wall surface of the body cutting space, the at least one cutting member being provided with at least one cutting edge, the cutting member having a virtual reference plane along a radial direction of the rotating shaft, the virtual reference plane being perpendicular to the rotating shaft By the cutting edge, the distance from the cutting edge to the rotating shaft on the virtual reference surface is smaller than the distance from the arbitrary side of the inner wall surface of the body adjacent to the cutting space to the rotating shaft, and the cutting member can use high hardness The metal is used to cut a high-hardness screw, but the rotating blade mainly has a high-hardness metal portion, which makes the rotary blade low in cost.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, so that the numerical value is changed or the equivalent element is replaced, or the equivalent of the scope of the patent application of the present invention. Changes and modifications are still within the scope of the invention patent.

10‧‧‧Rotary knife

20‧‧‧ body

21‧‧‧Connecting end

22‧‧‧Working end

23‧‧‧Cutting space

24‧‧‧ chip flute

241‧‧‧ side wall

30‧‧‧Cutting parts

31‧‧‧ cutting edge

20a‧‧‧ Ontology

23a‧‧‧Cutting space

24a‧‧‧ chip flute

25a‧‧‧ positioning groove

30a‧‧‧Cutting parts

90‧‧‧Drive Tools

91‧‧‧ bolt

C‧‧‧Rotary axis

L‧‧‧ virtual extension line

P‧‧‧virtual datum

Fig. 1 is a perspective view showing the first embodiment of the inverted tooth rotary knife of the present invention. Fig. 2 is an exploded perspective view showing the first embodiment of the inverted tooth rotary knife of the present invention. Fig. 3 is a cross-sectional structural view of the first embodiment of the inverted tooth rotary cutter of the present invention in the radial direction of the rotating shaft. Fig. 4 is a cross-sectional structural view showing the first embodiment of the inverted tooth rotary cutter in the axial direction of the rotary shaft of the present invention. Fig. 5 is a view showing the state of use of the first embodiment of the inverted tooth rotary knife of the present invention. Figure 6 is a perspective view of a second embodiment of the inverted tooth rotary knife of the present invention. Figure 7 is a cross-sectional structural view of the second embodiment of the inverted tooth rotary cutter in the axial direction of the rotary shaft of the present invention.

Claims (7)

An inverted tooth rotary cutter comprising: a body rotatable about a rotating shaft, the body forming a connecting end at one end of the rotating shaft axial direction and forming a working end at the opposite end; The working body is recessed in the axial direction of the rotating shaft with a cutting space extending from the working end toward the connecting end; at least one cutting member fixedly coupled to the welding body by welding An inner wall surface of the body cutting space, the at least one cutting member is provided with at least one cutting edge, the cutting member has a virtual reference surface along a radial direction of the rotating shaft, the virtual reference surface is perpendicular to the rotating shaft and passes through the cutting edge The virtual reference surface has a distance from the cutting edge to the rotating shaft that is smaller than a distance from the arbitrary one of the inner wall surface of the body adjacent to the cutting space to the rotating shaft. The inverted tooth rotary knife according to claim 1, wherein a width of the cutting space along a radial direction of the rotating shaft is tapered from the working end toward the connecting end to form a tapered space. The inverted tooth rotary knife according to claim 1 or 2, wherein the at least one cutting edge extends along an axial direction of a virtual extension line, the virtual extension line intersecting the rotation axis and forming a smaller side on a side adjacent to the working end The angle of 90 degrees. The inverted tooth rotary knife according to claim 3, wherein the inner wall surface of the body adjacent to the cutting space side is provided with at least one chip flute in a radial direction of the rotating shaft, and one end of the chip flute and the cutting space One end that is in communication with each other and different from the cutting space passes through the body and communicates with the outside, the number of the at least one chip flute is the same as the number of the at least one cutting edge, and the at least one chip flute corresponds to the at least one a cutting edge, the chip flute being located on the front side of the cutting edge and extending in a direction parallel to the axial direction of the virtual extension line and adjacent to the cutting edge. The inverted tooth rotary knife according to claim 4, wherein the long side of the chip flute is provided with two side walls, the two side walls are opposite to each other, and the cutting edge is located at a virtual position of the two side walls extending adjacent to the cutting space. Between the extension faces. The inverted tooth rotary knife according to claim 4, wherein the inner wall surface of the body adjacent to the cutting space side is provided with at least one positioning groove along a radial direction of the rotating shaft, the number of the at least one positioning groove and the The at least one positioning groove corresponds to the at least one chip groove, the at least one positioning groove and the at least one chip groove are adjacent to each other, and the at least one cutting piece is welded Fixedly coupled to the at least one positioning groove. The inverted tooth rotary knife according to claim 1, wherein the number of the at least one cutting member is four, and the four cutting members are evenly distributed on the inner wall surface of the body cutting space centering on the rotating shaft.