JP2010253590A - Cutting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting machine capable of efficiently cutting a plurality of cutting members having fixed lengths from materials to be cut and preventing end parts of the cutting members from being obliquely formed. <P>SOLUTION: This cutting machine includes a rotary drum 10 constituted by forming storage grooves 11 of a rotary shaft direction to store the bar-shaped materials W to be cut and a plurality of slits 12 orthogonal to the storage grooves 11 to be cut deeper than the storage grooves 11 at prescribed intervals in the rotary shaft direction on an outer peripheral surface, a pressing belt 40 wound on the outer peripheral surface of the rotary drum 10 to hold the materials W to be cut in the storage grooves 11, and a plurality of rotary blades 51A arranged for every of the plurality of slits 12 to be adjacent to the rotary drum 10 and rotatable in states of cutting edges penetrating into the pressing belt 40 and advancing into the slits 12 beyond the storage grooves 11. By rotating the rotary drum 10 in rotated states of the rotary blades 51A, the materials W to be cut held in the storage groove 11 and delivered in a peripheral direction can be simultaneously cut by a plurality of rotary blades 51A. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cutting machine that cuts a material to be cut into a certain length with a blade.

  For example, Patent Document 1 discloses a method of cutting a fine metal wire into a certain length. This cutting method cuts a fine metal wire by a so-called push-cut method. In Patent Document 1, as a push-cut method, a cutting blade (moving from left to right) is moved with respect to a fine metal wire positioned in the vertical direction so as to face a blade receiving plate arranged in the vertical direction. An example in which a fine metal wire is cut by a certain length by repeatedly pressing the blade) is disclosed.

  Further, generally, as the above-described push-cut method, the material to be cut placed on a flat surface is pressed down from the upper side to the lower side, and then the cutting blade is pressed against the material to be cut. It is also known to repeatedly perform an operation of cutting a material every certain length.

Japanese Patent Laid-Open No. 9-271876

  However, when the material to be cut is cut by the push-off method, a return process is required to return the cutting blade to the position before the cutting operation again in order to perform the next cutting operation. For this reason, if the operation | movement which cut | disconnects a to-be-cut material is performed repeatedly, much time will be required for a return process, and it could not be said that a some cutting member can be efficiently cut out from a to-be-cut material.

  Furthermore, when cutting a horizontally placed workpiece while being conveyed by a conveyor or the like, the shape of the cut surface of the material to be cut may not be stable, and the cut surface of the material to be cut may be inclined. . For this reason, the problem that the edge part of the cutting member cut out from the to-be-cut | disconnected material will be formed diagonally has also arisen.

  The present invention has been proposed in view of such a situation, and can efficiently cut out a plurality of cutting members having a certain length from a material to be cut, and the end portions of the cutting members are inclined. It aims at providing the cutting machine which prevents being formed.

In the cutting machine according to the first aspect of the present invention, an accommodation groove in the rotation axis direction that accommodates the rod-shaped workpiece is formed on the outer peripheral surface, and is cut deeper than the accommodation groove perpendicular to the accommodation groove. A rotating drum formed with a plurality of slits at predetermined intervals in the direction of the rotation axis; a pressing belt wound around an outer peripheral surface of the rotating drum to hold the material to be cut in the receiving groove; and the rotation A plurality of rotary blades arranged adjacent to the drum for each of the plurality of slits and capable of rotating in a state in which a cutting edge penetrates the pressing belt and enters the slits beyond the receiving groove, and the rotary blades By rotating the rotating drum in a state in which the rotating member is rotated, the material to be cut held in the receiving groove and fed in the circumferential direction can be simultaneously cut by the plurality of rotating blades.
According to the cutting machine of the first aspect of the present invention, a plurality of cutting members having a certain length corresponding to the interval between adjacent cutting blades are cut out at a time from the material to be cut by the plurality of rotary blades. Can do.
Further, after the plurality of rotary blades are cut into the material to be cut held in the receiving groove and exceed the receiving groove, the plurality of rotating blades are guided by the plurality of slits, and the plurality of rotating blades are perpendicular to the material to be cut. It is possible to maintain the state of being cut. Thereby, it can prevent that a to-be-cut | disconnected material is cut | disconnected diagonally with a some rotary blade, and the edge part of the said cutting member is not formed diagonally.

According to a second aspect of the present invention, in the first aspect, the pressing belt includes a pressing force adjusting unit that adjusts a pressing force for pressing the material to be cut against the receiving groove.
According to the invention of claim 2, it is possible to set an optimum pressing force for preventing the material to be cut from moving while being pressed against the receiving groove by the pressing force adjusting portion.

A third aspect of the present invention is characterized in that, in the first or second aspect, a plurality of the receiving grooves are formed in the direction of the rotation axis at a predetermined interval along the outer peripheral surface.
According to the invention of claim 3, by using a plurality of receiving grooves, a plurality of materials to be cut can be stored in the rotary drum. Thereby, it becomes possible to cut a cutting member from each of a plurality of materials to be cut, and the production efficiency of the cutting member is improved.

According to a fourth aspect of the present invention, in any one of the first to third aspects, a cleaning brush that cleans the rotary blades by contacting each of the plurality of rotary blades is provided.
According to the invention of claim 4, even when a part of the material to be cut is transferred to the blade edge or a foreign object adheres to the blade edge when the material to be cut is cut by the rotary blade, A part of the material to be cut and the foreign matter transferred to the blade edge can be removed. For this reason, it can prevent that the cutting defect of the to-be-cut material based on a part of to-be-cut material transferred to the blade edge | tip and the said foreign material arises.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, a cutting fluid ejecting section that ejects a cutting fluid to each of the plurality of rotary blades is provided.
According to the fifth aspect of the present invention, it is possible to prevent the cutting fluid from entering between the cutting edge of each of the plurality of rotary blades and the material to be cut, and the blade edge and the material to be cut from coming into close contact with each other. Thereby, since the frictional force between a blade edge | tip and a to-be-cut material can be made small, a rotary blade can cut | disconnect a to-be-cut material smoothly.

According to the cutting machine of the present invention, a plurality of cutting members having a certain length corresponding to the interval between adjacent cutting blades can be cut out at a time from the material to be cut by the plurality of rotary blades.
Further, after the plurality of rotary blades are cut into the material to be cut held in the receiving groove and exceed the receiving groove, the plurality of rotating blades are guided by the plurality of slits, and the plurality of rotating blades are perpendicular to the material to be cut. It is possible to maintain the state of being cut. Thereby, it can prevent that a to-be-cut | disconnected material is cut | disconnected diagonally with a some rotary blade, and the edge part of the said cutting member is not formed diagonally.

It is principal part side sectional drawing of the cutting machine of embodiment of this invention. It is a principal part front view of the cutting machine.

  An embodiment of the present invention will be described with reference to FIGS. 1 and 2. The illustrated cutting machine 1 includes a rotary drum 10, a rotary drum drive motor 20, a work transfer conveyor 30, a pressing belt 40, and a rotary blade accommodating unit 50.

  The rotating drum 10 had an outer diameter of 300 mm and a length in the direction of the rotation axis of 300 mm. As shown in FIG. 1, a work receiving groove 11 having a U-shaped cross section is formed on the outer peripheral surface of the rotary drum 10. The work accommodating groove 11 extends in the rotation axis direction X (see FIG. 2) of the rotary drum 10. In the present embodiment, 24 work accommodating grooves 11 are provided on the outer peripheral surface of the rotating drum 10, and the interval R <b> 1 between the work accommodating grooves 11 is set to the same value along the outer peripheral surface of the rotating drum 10. A rod-shaped workpiece W is accommodated in the workpiece accommodation groove 11. The workpiece W is an example of the material to be cut of the present invention.

  In addition, a slit 12 is formed on the outer peripheral surface of the rotary drum 10. The slit 12 is orthogonal to the workpiece accommodating groove 11 and is formed over the entire circumference of the outer peripheral surface. The slit 12 is cut deeper than the work accommodating groove 11 toward the inside of the rotary drum 12. Therefore, the slit 12 is continuous with the work accommodating groove 11. In the present embodiment, 31 slits 12 are formed on the outer peripheral surface of the rotary drum 10 at a predetermined interval in the rotation axis direction X in correspondence with the number of rotary blades 51A described later.

  A rotating drum drive motor 20 is connected to the rotating drum 10 via a chain 15. As shown in FIG. 2, a chain wheel 17 is attached to the rotary shaft 16 of the rotary drum 10. Here, the chain 15 is attached to the chain groove of the chain hole 17. As shown in FIG. 1, a chain cover 18 is provided above the chain 15. The rotary drum drive motor 20 transmits the driving force to the rotary shaft 16 by rotating the chain wheel 17 via the chain 15. Thereby, the rotating drum 10 rotates in the direction of the arrow.

  The workpiece conveying conveyor 30 places a rod-shaped workpiece W on the conveyor 30 and conveys the workpiece W toward the workpiece receiving groove 11 while aligning the workpieces W. A work guide member 31 is provided at the front end of the work conveyor 30 adjacent to the conveyor 30. The work guide member 31 has an inclined portion 31L formed by bending one end of an L-shaped bracket into a substantially L shape. Between the front end of the workpiece conveyor 30 and the inclined portion 31L, a gap is formed for dropping the workpiece W below the conveyor 30. When the rotary drum 10 rotates and the workpiece accommodation groove 11 is positioned immediately below the gap, the workpiece W dropped through the gap is accommodated in the workpiece accommodation groove 11. As shown in FIG. 2, the workpiece W is accommodated in the workpiece accommodation groove 11 with both end portions protruding from the workpiece accommodation groove 11. The work guide member 31 is fixed to a member for fixing the work guide member 31 by bolts and nuts.

  The pressing belt 40 is wound around the outer peripheral surface of the rotating belt 10 while adjusting the tension strength by coordinating clamp rollers 31A and 31B, which will be described later, and gripping members 32A and 32B that sandwich the pressing belt 40. As shown in FIG. 2, the lateral width dimension L of the pressing belt 40 is set to be approximately the same value as the length dimension of the rotating drum 10 in the rotational axis direction.

  The first clamp roller 31 </ b> A is disposed above the rotating drum 10 and changes the direction of the pressing belt 40 from the outer periphery of the rotating drum 10 upward. The upper edge of the direction-changed pressing belt 40 is gripped between the bolt B1 and the upper gripping member 32A by using a through-hole (not shown) of the pressing belt 40 provided in advance. Reference numeral 33 in the drawing denotes a bolt that fastens the upper gripping member 32A to a fixing member (not shown).

  The second clamp roller 31 </ b> B is disposed below the rotating drum, and changes the direction of the pressing belt 40 downward from the outer periphery of the rotating drum 10. The lower edge of the pressure belt 40 whose direction has been changed uses a through-hole (not shown) of the pressure belt 40 provided in advance, so that the nut 34A and the lower gripping member 32B of the second clamp roller position adjusting mechanism 34 are provided. Is gripped between. In the present embodiment, by adjusting the engagement position of the nut 34A and the nut 34B with the positioning groove of the second clamp roller position adjusting mechanism 34, the lower gripping member 32B in the vertical direction of the second clamp roller position adjusting mechanism 34 is adjusted. The position is changed, and the degree to which the pressing belt 40 is brought into close contact with the outer peripheral surface of the rotating belt 10 is adjusted. Thereby, the force by which the pressing belt 40 presses the workpiece W accommodated in the workpiece accommodating groove 11 can be adjusted. The second clamp roller position adjustment mechanism 34 feeds the second clamp roller holding member 35 in accordance with the outer diameter size of the rotary drum 10, so that the second clamp roller in the vertical direction of the second clamp roller position adjustment mechanism 34. By changing the position of the holding member 35, the position of the second clamp roller 31B with respect to the rotating drum 10 is adjusted. The lower gripping member 32B and the second clamp roller position adjusting mechanism 34 (34A, 34B) are examples of the pressing force adjusting unit of the present invention.

  A slitter 51, a cutting fluid ejection path 52, a cleaning brush roller 53, and a terminal member collection container 54 are accommodated in the rotary blade accommodating portion 50. As shown in FIG. 2, the slitter 51 is configured by arranging 31 circular rotary blades 51 </ b> A in the axial direction of the slitter 51 so as to correspond to the 32 slits 12 described above. As shown in FIG. 1, the slitter 51 is disposed on the side of the rotary drum 10, and as will be described later, the cutting edge of the rotary blade 51 </ b> A penetrates the pressing belt 40 and enters the slit 12 through the work receiving groove 11. It is possible to arrange in the state. The slitter 51 is connected to a slitter drive motor 56 shown in FIG. The slitter 51 is rotated by the slitter driving motor 56 in a direction opposite to the rotation direction of the rotary drum 10 as indicated by an arrow in FIG.

  As shown in FIG. 2, the cutting fluid ejection path 52 is configured by a duct connected to a cutting fluid supply device (not shown). The cutting fluid ejection path 52 is disposed above the slitter 51 in a state parallel to the axis of the slitter 51. In the cutting fluid ejection path 52, ejection ports are opened at locations (31 locations here) facing the rotary blade 51A. The cutting fluid supplied from the cutting fluid supply device to the cutting fluid ejection path 52 is ejected from each ejection port toward the cutting edges of all the rotary blades 51A. The cutting fluid ejection path 52 is an example of the cutting fluid ejection unit of the present invention.

  As shown in FIG. 2, the cleaning brush roller 53 is pivotally supported by each column 57 that supports both ends of the roller 53. The length dimension of the cleaning brush roller 53 in the axial direction was set to be substantially the same as the length dimension of the slitter 51 in the axial direction. The cleaning brush roller 53 is arranged below the slitter 51 in a state parallel to the axis of the slitter 51, and is in a state where it enters a predetermined amount with respect to each rotary blade 51A. Here, the cleaning brush roller 53 is rotated in the same direction as the rotation direction of the slitter 51 (see FIG. 1) using a motor (not shown). Thereby, the cleaning brush roller 53 contacts the cutting edge of each rotary blade 51A, and removes foreign matters and the like attached to the cutting edge. The cleaning brush roller 53 is an example of the cleaning brush of the present invention.

  As shown in FIG. 2, the end member collection containers 54 </ b> A and 54 </ b> B are disposed vertically below the positions where both ends of the work W protrude from the work receiving groove 11. The pressing belt 40 is not pressed against the portion where the workpiece W protrudes from the workpiece receiving groove 11. For this reason, immediately after cutting the workpiece W, the end member W2 corresponding to the portion where the workpiece W protrudes from the workpiece receiving groove 11 is not held in the workpiece receiving groove 11, and as shown in FIGS. It falls toward the member collection containers 54A and 54B.

  As shown in FIG. 1, the cutting member collection container 55 is arranged at a position where 30 cutting members W1 (see FIG. 2) cut out from the rod-shaped workpiece W can be dropped by the rotary blades 51A. ing. Here, as a position at which 30 cutting members W1 can be dropped, the above-described pressing belt 40 is wound around the outer peripheral surface of the rotating drum 10 at a position after the workpiece W is cut by each rotary blade 51A. The position where each cutting member W1 falls by the dead weight from the workpiece accommodating groove 11 is selected. The length of each cutting member W1 is determined to be a fixed length according to the interval between the adjacent rotary blades 51A.

  Next, operation | movement of the cutting machine 1 of this embodiment is demonstrated. Here, an example of cutting a ceramic member having a certain length from the fired product as the cutting member W1 after selecting a fired product of a rod-shaped ceramic molded body having an outer diameter of 30 mm as the workpiece W is exemplified. .

  The workpieces W are sequentially placed on the workpiece transfer conveyor 30 from the workpiece loading position. Thereafter, the plurality of workpieces W are conveyed toward the inclined portion 31L. Subsequently, as described above, the plurality of workpieces W respectively pass through the gaps between the front end of the workpiece conveyor 30 and the inclined portion 31L, and sequentially accommodate in the different workpiece accommodating grooves 11 as the rotary drum 10 rotates. Is done.

  As shown in FIG. 1, at the portion where the pressing belt 40 is wound around the outer peripheral surface of the rotary drum 10, the workpiece W is pressed against the workpiece receiving groove 11 by the pressing belt 40. For this reason, even when the workpiece W moves downward of the rotating drum 10 toward the slitter 51 as the rotating drum 10 rotates, the workpiece W does not come out of the workpiece receiving groove 11.

  After the pressing belt 40 is wound around the outer peripheral surface of the rotary drum 10, the blade tip of each of the 31 rotary blades 51A in the rotating state is moved forward by moving the rotary blade housing portion 50 in the retracted position to the operating position shown in FIG. After passing through the pressing belt 40, the workpiece is allowed to enter the slit 12 beyond the workpiece receiving groove 11.

  As illustrated in FIG. 1, the rotating drum 10 continues to rotate in the circumferential direction, so that the workpiece W reaches a position where it crosses the rotating blade 51A. At this time, since the cutting edge of each of the 31 rotary blades 51A is cut into the workpiece W accommodated in the workpiece accommodating groove 11, the workpiece W is cut by simultaneously cutting the workpiece W at 31 locations to form a ring. Divide into 32 pieces. At this time, the cutting fluid enters between the cutting edge of each rotary blade 51A and the workpiece W, thereby preventing the cutting edge and the workpiece W from coming into close contact with each other.

  As described above, the two end members W2 included in the 32 workpieces W fall toward the end member collection containers 54A and 54B when the workpiece W is cut into a circle. The end member W2 that has fallen into the end member collection containers 54A and 54B is discarded without being handled as a product.

  On the other hand, the 30 cutting members W1 except for the two end members W2 reach the position near the lowest point of the rotating drum 10 that is not pressed by the presser belt 40 while the rotating drum 10 continues to rotate in the circumferential direction. When this happens, it drops toward the cutting member collection container 55 and is collected. The 30 cutting members W1 collected by the cutting member collection container 55 are shipped as products.

  In the cutting machine 1 of the present embodiment, the rotary drum 10 is rotated while the workpiece W is received in the workpiece receiving groove 11, and the operation of turning the workpiece W into a ring is continued by the rotating blade 51 </ b> A in a rotating state. Thus, the cutting member W1 can be collected in the cutting member collection container 55. When the operation of cutting the workpiece W into a circle by the rotating blade 51A is continued, a part of the workpiece W may be transferred to the cutting edge of the rotating blade 51A and the cutting edge may become dirty. When this dirt is accumulated, the sharpness of the rotary blade 51A is deteriorated, and the possibility that a cutting defect of the workpiece W occurs is increased. In the cutting machine 1 according to the present embodiment, the cleaning brush roller 53 continues to operate in contact with the cutting edge of the rotary blade 51A as the rotary drum 10 rotates, thereby removing a part of the workpiece W1 transferred to the cutting edge. Continue to do. Thereby, it is suppressed that a part of workpiece | work W1 transfers to the blade edge | tip of rotary blade 51A, it suppresses that the sharpness of rotary blade 51A falls, and it prevents that the cutting | disconnection defect of the workpiece | work W generate | occur | produces.

<Effect of this embodiment>
In the cutting machine 1 of the present embodiment, as described above, the bar-shaped workpieces W accommodated in the workpiece accommodation grooves 11 can be simultaneously cut by the 31 rotary blades 51A. The 31 rotary blades 51 </ b> A rotate in a state where they pass through the pressing belt 40 that presses the workpiece W against the workpiece housing groove 11 and enter the 31 slits 12 beyond the workpiece housing groove 11.
Thereby, the 30 cutting members W1 having a certain length corresponding to the interval between the adjacent rotary blades 51A can be cut out from the single rod-shaped workpiece W1 at a time by the 31 rotary blades 51A. .
Further, the 31 slits 12 are orthogonal to the work accommodating grooves 11 and are cut deeper than the respective work accommodating grooves 11 toward the inside of the rotary drum 12.
For this reason, after the 31 rotary blades 51A are cut into the workpieces W pressed against the workpiece housing grooves 11 and exceed the respective workpiece housing grooves 11, they are guided by the 31 slits 12 and the 31 rotary blades. Each of 51A can hold the state cut at right angles to the rod-shaped workpiece W. Thereby, it can prevent that the workpiece | work W is cut | disconnected diagonally by 31 rotary blades 51A, and the both ends of the cutting member W1 are not formed diagonally.

  Further, as described above, by adjusting the degree to which the pressing belt 40 is brought into close contact with the outer peripheral surface of the rotating belt 10 by the both clamp rollers 31A and 31B, the both holding members 32A and 32B, and the second clamp roller position adjusting mechanism 34. The force for pressing the workpiece W accommodated in the workpiece accommodating groove 11 can be adjusted. As a result, it is possible to set an optimal pressing force in order to prevent the workpiece W from being moved by being pressed against the workpiece receiving groove 11.

  Furthermore, in the above-described embodiment, since the 24 workpiece storage grooves 11 are formed on the outer peripheral surface of the rotary drum 10, a plurality of workpieces W are stored in the rotary drum 10 by using the workpiece storage grooves 11. Can do. For this reason, the cutting member W1 can be cut out from each of the plurality of workpieces W by the 31 rotary blades 51A, and the production efficiency of the cutting member W1 is improved.

  In addition, since the cleaning brush roller 53 comes into contact with the respective blade tips of the 31 rotary blades 51A and cleans the rotary blades, when the workpiece W is cut by each rotary blade 51A, a part of the workpiece W becomes the blade tip. Even if foreign matter adheres to the cutting edge or adheres to the cutting edge, the cleaning brush roller 53 can remove a part of the workpiece W or foreign matter transferred to the cutting edge. For this reason, it is possible to prevent the sharpness of the rotary blade 51A from being deteriorated due to a part of the workpiece W transferred to the blade edge or the foreign matter, and to prevent the cutting failure of the workpiece W from occurring.

  In addition, as described above, the cutting fluid enters between the cutting edge of each rotary blade 51A and the workpiece W, thereby preventing the cutting edge and the workpiece W from coming into close contact with each other. Thereby, the frictional force between each cutting edge and the workpiece W is reduced, and the cutting resistance when the workpiece W is cut is reduced. For this reason, the quality of the cut surface (the both ends of the cutting member W1) of the workpiece | work W can be kept favorable.

  The present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing a part of the configuration without departing from the spirit of the invention. In the embodiment described above, the outer diameter dimension and the length dimension in the rotation axis direction of the rotating drum 10 are each 300 mm, but instead, the outer diameter dimension and the length dimension of the rotating drum are appropriate values other than 300 mm. May be set.

Moreover, you may set the number of the workpiece | work accommodation groove | channel 11, the slit 12, and the rotary blade 51A to an appropriate number other than having illustrated in embodiment mentioned above. The cross section of the work accommodating groove 11 is not limited to a U shape, and may be a V shape.
Furthermore, the rod-shaped workpiece W is not limited to the molded body after firing, and a molded body before firing may be used. In addition, the outer diameter dimension of the workpiece W is not limited to 30 mm described above, and may be changed to an appropriate dimension between 5 mm and 30 mm.

  1 .... Cutting machine, 10 .... Rotating drum, 11 .... Work receiving groove, 12 .... Slit, 31A ... First clamp roller, 31B ... Second clamp roller, 32A ... Upper gripping member, 32B ... Lower gripping member, 34, second clamp roller position adjustment mechanism, 40, pressing belt, 51A, rotary blade, 52, cutting fluid ejection path, 53, cleaning brush roller, R1, work accommodating groove 11 Interval, X ... rotation axis direction of rotating drum, W ... work in rod shape

Claims (5)

On the outer peripheral surface, a housing groove in the rotational axis direction that accommodates the rod-shaped workpiece is formed, and a plurality of slits that are cut deeper than the housing groove perpendicular to the housing groove are predetermined in the rotational axis direction. A rotating drum formed at an interval;
A pressing belt wound around an outer peripheral surface of the rotating drum and holding the material to be cut in the receiving groove;
A plurality of rotating blades arranged adjacent to the rotating drum for each of the plurality of slits, and capable of rotating in a state in which a blade edge penetrates the pressing belt and enters the slits beyond the receiving groove,
By rotating the rotary drum in a state where the rotary blade is rotated, the material to be cut that is held in the receiving groove and is sent in the circumferential direction can be simultaneously cut by the plurality of rotary blades. And cutting machine.   The cutting machine according to claim 1, further comprising a pressing force adjusting unit that adjusts a pressing force with which the pressing belt presses the material to be cut against the housing groove.   The cutting machine according to claim 1 or 2, wherein a plurality of the housing grooves are formed in the direction of the rotation axis at predetermined intervals along the outer peripheral surface.   The cutting machine according to any one of claims 1 to 3, further comprising a cleaning brush that contacts the cutting edges of the plurality of rotary blades to clean the rotary blades.   The cutting machine according to any one of claims 1 to 4, further comprising a cutting fluid spraying unit that sprays a cutting fluid onto each of the cutting edges of the plurality of rotary blades.

Images