JP2016135515A - Circle cutting cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circle cutting cutter capable of smoothly and satisfactorily cutting off or cutting out a plate to be cut by means of a cutter blade, capable of preventing damage of the surface of a plate to be cut and core deviation and capable of cutting off a true circle and cutting out the true circle from the plate to be cut.SOLUTION: A circle cutting cutter includes: a long-size frame 1; a support means 2 which is disposed on the frame 1 and supports the frame 1 freely swingably in the horizontal direction on a plate P to be cut; a blade stand 4 disposed on the frame 1; and a cutter blade 5 fastened to the blade stand 4 in a posture vertical to the frame 1. Therein, a distance between the support means 2 and the blade stand 4 can be variably adjusted, the frame 1 is swung in the horizontal direction on the plate P to be cut by the support means 2, the surface of the plate P to be cut is cut off into a circular shape with the cutter blade 5 or the plate P to be cut is cut out into a circular shape. Further, the blade stand 4 is provided with a contacting part 4d which is formed so as to be protruded to the swinging direction side from the lateral side of the frame 1, is caused to slide on the surface of the plate P to be cut when swinging the frame 1 and keeps a cutting angle α formed by an edge part 5b of the cutter blade 5 and the surface of the plate P to be cut constant.SELECTED DRAWING: Figure 1

Description

  The present invention cuts the surface of a cut plate such as a hard plastic plate such as an acrylic resin plate, a wooden plate material such as a plywood, or a soft metal plate such as an aluminum plate, or cuts out the cut plate into a circle. It is related with the improvement of the circular cutter for attaching.

  Conventionally, as this type of circular cutter, although not shown, a long frame, a supporting means provided on the frame and rotatably supporting the frame horizontally on a plate to be cut, and a frame A tool post provided, and a cutter blade (also referred to as a plastic cutting blade) fixed to the tool post in a posture orthogonal to the frame so that the distance between the support means and the tool post can be variably adjusted. (For example, refer patent documents 1-4).

  Thus, when using the circular cutter, first, the surface of the plate to be cut is cut into a circle, or the cutting means is cut out into a circle, or the support means and the tool post are matched. After the distance is adjusted, the frame is supported by the supporting means so as to be pivotable in the horizontal direction on the plate to be cut, and the frame is centered on the supporting means with the tip of the cutter blade pressed against the surface of the plate to be cut. Then, the frame is swung horizontally on the plate to be cut, and the cutter blade is moved so that the surface of the plate to be cut is cut by the tip of the cutter blade. Then, while the cutter blade of the tool post provided on the frame draws a circular trajectory, a circular groove is dug in the surface of the plate to be cut, thereby cutting out the plate or cutting the plate to be cut into a circle. Can be.

  However, since the conventional circular cutter described above has a slight clearance between the frame and the support means for rotatably supporting the frame, when the frame is turned horizontally around the support means. The frame may rattle against the support means due to the clearance. Therefore, the cutter blade may swing during the notch operation by the cutter blade, and the cutting angle of the cutter blade into the plate to be cut may change. As a result, there has been a problem that the notch and the cutout of the plate to be cut by the cutter blade cannot be performed smoothly and satisfactorily.

  Further, the conventional circular cutter has a needle-like body that pierces the surface of the plate to be cut and a disc-shaped seat body having a relatively large area in order to prevent the center of rotation of the frame from shifting. In a circular cutting cutter provided with a shape, there is no problem when the cut plate is pierced and a portion other than the circular portion of the cut plate is required, but a scar remains when the circular portion itself is required In addition, in a circular cutting cutter provided with a disk-shaped seat, when the cut plate is cut out or cut out, the seat moves with respect to the cut plate, and the misalignment occurs. In some cases, the cut plate cannot be cut out into a perfect circle or cut out into a perfect circle.

Japanese Utility Model Publication No. 53-023090 Japanese Utility Model Publication No. 58-191994 Japanese Utility Model Publication No.59-132895 Japanese Utility Model Publication No. 02-130798

This invention is made | formed in view of such a problem, and makes it a main objective to provide the circular cutting cutter which can perform the notch and cutting of the to-be-cut plate by a cutter blade smoothly and favorably.
Another object of the present invention is to provide a round cutter that can prevent damage to the surface of the plate to be cut and misalignment and can cut the plate to be cut into a perfect circle or cut it into a perfect circle. And

  In order to achieve the above object, a circular cutter according to the present invention is provided with a long frame, support means provided on the frame and supporting the frame so as to be pivotable in a horizontal direction on a plate to be cut, and provided on the frame. And a cutter blade fixed to the tool post in a posture orthogonal to the frame, the distance between the support means and the tool post can be variably adjusted, and the frame is supported on the plate to be cut by the support means. It is a circular cutter that rotates in the horizontal direction and cuts the surface of the plate to be cut into a circle with a cutter blade, or cuts out the plate to be cut into a circle, and the tool post is turned from the side of the frame. It has a contact part that protrudes in the direction side and slides on the surface of the plate to be cut when the frame is turned to keep the cutting angle between the blade edge of the cutter blade and the surface of the plate to be cut constant. Special To.

  It is preferable that the contact part of the tool post has a shape that makes line contact or point contact with the surface of the plate to be cut.

  The contact portion of the tool post preferably has a convex portion having a rounded cross section.

  It is preferable to further include a turning operation unit that is provided on the upper surface side of the frame so as to be rotatable about a vertical axis and that turns the frame in the horizontal direction.

  The support means includes a suction cup that is attracted to the surface of the plate to be cut, a support shaft that is erected at the center of the suction cup and rotatably supported by the frame, and is rotatably screwed to the outer peripheral surface of the support shaft. And a presser that is interposed between the lower surface of the frame and the suction cup and presses the outer peripheral edge of the suction cup toward the surface side of the plate to be cut. And the central part of the suction cup adsorbed on the surface of the plate to be cut by the tightening operation of the knob to the support shaft is pulled up via the support shaft, and between the suction surface of the suction cup and the surface of the plate to be cut It is preferable that the vacuum space is formed and the outer peripheral edge of the suction cup is pressed against the surface of the plate to be cut by the presser.

  The circular cutter of the present invention is such that a tool post for fixing a cutter blade protrudes from the side of the frame to the turning direction side and slides on the surface of the plate to be cut when the frame turns, and the tip of the cutter blade And the surface of the plate to be cut are provided with a contact portion that keeps the cutting angle constant, so that even if there is a clearance between the frame and the support means for rotatably supporting the frame, The contact portion can prevent the frame and the cutter blade from rattling, and the cutting angle of the cutter blade into the plate to be cut is always maintained at a fixed and suitable angle. As a result, it is possible to smoothly and satisfactorily cut out and cut out the plate to be cut by the cutter blade.

  In addition, since the circular cutting cutter of the present invention has a shape in which the contact portion of the tool post is in line contact or point contact with the surface of the object to be cut, at the time of cutting out or cutting out the plate to be cut by the cutter blade, Even if the abutting portion slides on the surface of the plate to be cut, the frictional resistance does not increase and the frame turning operation is not hindered.

  Furthermore, the circular cutting cutter of the present invention includes a sucker that is vacuum-adsorbed on the surface of the plate to be cut, so that the surface of the plate to be cut can be prevented from being damaged and misaligned, and the plate to be cut can be perfectly round. Can be cut into a circle or cut into a perfect circle.

It is a perspective view showing one embodiment of a circular cutting cutter concerning the present invention. It is a front view of the circular cutting cutter shown in FIG. It is a top view of the circular cutter shown in FIG. It is a bottom view of the circular cutter shown in FIG. It is a right view of the circular cutting cutter shown in FIG. It is an AA line expanded sectional view of FIG. FIG. 3 is an enlarged sectional view taken along line B-B in FIG. 2. FIG. 6 is an enlarged sectional view taken along the line CC of FIG. 5. It is a disassembled perspective view of the frame of a circular cutter. It is a perspective view which shows the state which cuts out a to-be-cut board (plastic plate) circularly using the circular cutting cutter shown in FIG. 1, or cuts out. It is a partially omitted enlarged front view of a circular cutting cutter showing a state where a cut plate (plastic plate) is similarly cut out into a circle or cut out. It is the DD sectional view taken on the line of FIG.

  An embodiment of a circular cutter according to the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or similar component through the whole figure.

  The circular cutting cutter of the present invention has a circular surface of a desired size on the surface of a cut plate P such as a hard plastic plate such as an acrylic resin plate or a polyethylene resin plate, a wooden plate material such as a plywood, or a soft metal plate such as an aluminum plate. Or the cut plate P is cut out in a circular shape.

  That is, as shown in FIGS. 1 to 8, the circular cutter is provided on the long frame 1 and one end of the frame 1 so as to support the frame 1 on the plate P so as to be pivotable in the horizontal direction. Supporting means 2, a turning operation part 3 provided at the other end of the frame 1 for turning the frame 1 in the horizontal direction, and a supporting means 2 provided on the frame 1 so as to be slidable in the longitudinal direction of the frame 1. And a cutter blade 5 fixed to the tool post 4 in a posture orthogonal to the frame 1, and the frame 1 is horizontally supported on the plate P to be cut by the support means 2. After the frame 1 is swiveled horizontally by the swivel operation unit 3, the surface of the plate P is cut into a circular shape by the cutter blade 5 fixed to the tool post 4 or Cut the cutting plate P into a circle It has to be able to or remove.

  Specifically, as shown in FIGS. 1 and 9, the frame 1 includes a long, substantially rectangular top plate 1 a and a pair of side plates 1 b that hang downward along the long side of the top plate 1 a. A metal frame main body 1A, a first support board 1B made of plastic with a base end side inserted into one end opening of the frame main body 1A and a tip end side protruding outward from one end of the frame main body 1A; An end side is inserted into the other end opening of the frame main body 1A, and a tip end side is provided with a plastic second support plate 1C protruding outward from the other end of the frame main body 1A.

  A guide hole 1c for slidably attaching the tool post 4 to the frame body 1A is formed in the top plate 1a of the frame body 1A. The guide hole 1c penetrates in the vertical direction and is formed along the longitudinal direction of the frame body 1A.

  Further, a circular first through hole 1d penetrating in the vertical direction is formed at one end of the top plate 1a of the frame main body 1A, and the other end of the top plate 1a of the frame main body 1A is formed in the vertical direction. A circular second through-hole 1e penetrating through is formed.

  The first support board 1B is formed with a first support hole 1f in a vertically penetrating manner so as to support the support means 2 in alignment with the first through hole 1d of the frame body 1A. The support board 1C is formed with a second support hole 1g extending in the vertical direction so as to match the second through hole 1e of the frame body 1A and support the turning operation unit 3. An annular protrusion 1h for positioning the first support board 1B on the frame body 1A is inserted into the first through hole 1d of the frame body 1A from the lower surface side of the frame body 1A on the upper surface of the first support board 1B. Is formed.

  In the above embodiment, the frame 1 is composed of three members: the frame main body 1A, the first support plate 1B, and the second support plate 1C. However, the structure and shape of the frame 1 are limited to the frame 1 described above. Any structure and shape may be used as long as the support means 2 and the turning operation unit 3 can be provided and the tool post 4 can be slidably provided. For example, the frame 1 may be the frame 1 in which the frame main body 1A, the first support board 1B, and the second support board 1C are integrally formed of a plastic material or a metal material. Further, the frame 1 may be provided with a scale (not shown) in which the turning center of the frame 1 (the center of the first support hole 1f of the first support board 1B) is zero. If a scale is provided on the frame 1, the tool rest 4 can be moved while looking at the scale, and the distance from the turning center of the frame 1 to the cutter blade 5 can be easily adjusted to a desired distance.

  The support means 2 is provided at one end of the frame 1 and is held by vacuum suction at a desired position on the surface of the plate to be cut P to support the frame 1 on the plate to be cut in a horizontal direction. To do.

  That is, as shown in FIG. 8, the support means 2 is rotatably supported through the suction cup 6 adsorbed on the surface of the plate P and the first support hole 1f of the first support board 1B of the frame 1. A first sleeve 7 with a hook, a support shaft 8 that is erected at the center of the suction cup 6 and rotatably supported by the first sleeve 7, and is rotatably screwed to the outer peripheral surface of the upper end portion of the support shaft 8 And a knob 9 that is tightened to the support shaft 8, and an outer peripheral edge portion of the suction cup 6 that is interposed between the lower surface of the first support board 1 B of the frame 1 and the suction cup 6 while penetrating the support shaft 8. And a presser plate 10 that presses the plate toward the surface side of the plate P to be cut.

  Specifically, the suction cup 6 is formed in a circular dish shape with a flexible plastic material or rubber material, and is positioned below the first support plate 1B of the frame 1 with the concave surface 6a facing downward. Has been placed.

  The first sleeve 7 is formed of a plastic material or a metal material, and is inserted into the first support hole 1f of the first support board 1B of the frame 1 from the upper surface side and can rotate about the vertical axis.

  The support shaft 8 is made of a plastic material or a metal material, and has a disk-like substrate portion 8a embedded in the center of the upper surface of the suction cup 6, and an outer peripheral surface of the upper end portion standing at the center of the substrate portion 8a. And a shaft portion 8b in which a male screw is formed. The shaft 8b of the support shaft 8 is inserted into the first sleeve 7 with the hook from the lower surface side of the first support plate 1B, and the first support hole of the first support plate 1B is inserted through the first sleeve 7. 1f is supported so as to be rotatable about a vertical axis.

  The knob portion 9 is formed of a plastic material or a metal material, and includes a cylindrical portion 9a formed with a female screw that is screwed into a male screw of the support shaft 8, and a disc portion 9b that is provided continuously with the upper end of the cylindrical portion 9a. And. The knob portion 9 is screwed into the shaft portion 8 b of the support shaft 8, and is picked in a state where the lower end surface of the knob portion 9 (the lower end surface of the cylindrical portion 9 a) is in contact with the upper end surface of the first sleeve 7. The support shaft 8 can be pulled up by tightening the portion 9 to the support shaft 8 side.

  The presser board 10 is formed in a circular bowl shape from a hard plastic material or metal material, and a through hole 10a through which the support shaft 8 is inserted is formed at the center. The presser plate 10 is interposed between the lower surface of the first support plate 1B of the frame 1 and the suction cup 6 with the concave surface 10b facing downward, and the lower end of the outer peripheral edge thereof is at the outer peripheral edge of the suction cup 6. It comes to contact.

  Thus, according to the support means 2, the knob 9 is pressed toward the surface of the cut plate P so that the suction cup 6 is attracted to the surface of the plate P, and the knob 9 is turned in this state. When tightening to the support shaft 8 side, the lower end surface of the knob portion 9 is in contact with the upper end surface of the first sleeve 7, so that the support shaft 8 is pulled up by the tightening operation of the knob portion 9 to the support shaft 8. Along with this, the central portion of the suction cup 6 adsorbed on the surface of the plate to be cut P is also lifted through the support shaft 8 to form a vacuum space between the suction surface of the suction cup 6 and the surface of the plate to be cut P. Going to be. In addition, since the lower edge of the outer peripheral edge of the presser plate 10 presses the outer peripheral edge of the suction cup 6 toward the surface side of the plate to be cut P by the tightening operation of the knob 9 to the support shaft 8, the outer peripheral edge of the suction cup 6 is inward. It becomes difficult to be drawn into. As a result, the suction force of the suction cup 6 is increased, and the suction force is reliably and firmly vacuum-sucked on the surface of the plate P to be cut.

  In this way, when the supporting means 2 is held at a desired position on the surface of the plate P by vacuum suction, the supporting means 2 supports the frame 1 on the plate P so as to be pivotable in the horizontal direction. Can do. At this time, the frame 1 pivots horizontally around the axis φ of the support shaft 8 while the inner peripheral surface of the first support hole 1f of the first support plate 1B slides on the outer peripheral surface of the first sleeve 7. It will be.

  Further, when removing the suction cup 6 of the support means 2 from the surface of the plate to be cut P, if the knob portion 9 is turned in the opposite direction to loosen, the support shaft 8 and the central portion of the suction cup 6 are lowered, Since the vacuum state between the suction surface of the suction cup 6 and the surface of the plate to be cut P is relaxed, the suction cup 6 can be easily detached from the surface of the plate to be cut P.

  The turning operation unit 3 is provided at the other end of the frame 1 so as to be rotatable about a vertical axis, and is used to turn the frame 1 in the horizontal direction.

  That is, as shown in FIG. 8, the turning operation unit 3 is provided with a hook with a hook that is rotatably inserted into the second support hole 1g of the second support plate 1C of the frame 1 and the second through hole 1e of the frame body 1A. 2 sleeve 11, and an operation shaft 13 that is rotatably inserted into and supported by second sleeve 11 and is prevented from coming off by nut 12.

  Specifically, the second sleeve 11 is formed of a plastic material or a metal material. The second sleeve 11 extends from the lower surface side to the second support hole 1g of the second support plate 1C of the frame 1 and the second through hole 1e of the frame body 1A. It is inserted and can rotate around the vertical axis.

  The operation shaft 13 is formed in a stepped shaft shape with a plastic material or a metal material, and has a small diameter shaft portion 13a that is inserted into the second sleeve 11 from the upper surface side and has a lower end outer peripheral surface formed with a male screw. A large-diameter shaft 13b is provided which is connected to the upper end of the shaft portion 13a and whose lower end surface is in contact with the upper end surface of the second sleeve 11.

  Thus, according to the turning operation part 3, if the large-diameter shaft part 13b of the operation shaft 13 is gripped by a finger and the frame 1 is turned in the horizontal direction around the support means 1, the operation shaft 13 is moved to the first position. By rotating around the vertical axis via the two sleeves 11, the frame 1 can be easily and easily turned in the horizontal direction.

  The tool post 4 is formed of a plastic material or a metal material, and is positioned between the opposing side plates 1b of the frame main body 1A as shown in FIGS. 1 and 8, and is approximately the same size as the interval between the side plates 1b. The sliding portion 4a having a rectangular planar shape, a screw shaft 4b standing at the center of the upper surface of the sliding portion 4a and inserted through the guide hole 1c of the frame body 1A, and the sliding portion 4a An arm portion 4c that is connected to the lower surface side and protrudes from the side of the frame 1 toward the turning direction of the frame 1, and is formed on the lower surface of the distal end portion of the arm portion 4c. And a contact portion 4d that keeps a cutting angle α (see FIG. 12) formed by the blade edge portion 5b of the cutter blade 5 and the surface of the plate P to be cut.

  The abutting portion 4d of the tool post 4 is formed in a round-shaped convex portion, specifically a protrusion having a width of several millimeters, and has a shape that makes line contact with the surface of the plate P to be cut. (See FIG. 11 and FIG. 12). Further, the contact portion 4d of the tool post 4 is formed at a position several cm away from the axis of the screw shaft 4b. Further, a positioning pin 4e for positioning the cutter blade 5 to a predetermined posture is formed on one side surface of the tool post 4 (a side surface opposite to the side surface facing the support means 2).

  Then, the tool post 4 inserts the sliding portion 4a between the side plates 1b of the frame main body 1A, inserts the screw shaft 4b into the guide hole 1c of the frame main body 1A, and the screw shaft 4b protruding from the upper surface of the frame main body 1A. A cylindrical fixing member 14 having a female screw threadedly engaged with the screw shaft 4b is screwed onto the inner peripheral surface, thereby being attached to the frame body 1A. The tool post 4 can be fixed to the frame main body 1A by tightening the fixing member 14, and by loosening the fixing member 14, the longitudinal direction of the frame main body 1A along the guide hole 1c of the frame main body 1A. Can be moved to slide. As a result, the distance between the tool rest 4 and the support means 2 can be variably adjusted by sliding the tool rest 4 relative to the frame body 1A.

  The tool post 4 is not limited to the tool post 4 described above, and has a contact portion 4d that comes into sliding contact with the surface of the plate P to be cut, and can be slidably attached to the frame body 1A. Any structure and shape are possible if possible. Moreover, although the contact part 4d of the tool rest 4 was made into the shape which carries out a line contact with the surface of the to-be-cut board P, the shape of the contact part 4d is not limited to this, The contact part of the tool rest 4 4d may have a shape that makes point contact with the surface of the plate P to be cut, or may have a surface contact shape, and the contact may be made not only at one location but at a plurality of locations.

  The cutter blade 5 cuts the surface of the plate to be cut P into a circle or cuts out the plate to be cut P into a circle, and is fitted to the positioning pins 4e of the tool post 4 as shown in FIG. A long plate-like main body portion 5a in which a positioning hole 5c is formed, and a plate-like blade edge portion 5b that is connected to one end of the main body portion 5a and has an inverted triangular shape in a side view.

  Further, a double-edged blade 5d having a tapered cross-sectional shape is formed on the side opposite to the traveling direction of the cutting edge portion 5b of the cutter blade 5 (the arrow direction shown in FIGS. 6 and 12). The surface of the plate to be cut P is cut off at the end on the side.

  The cutter blade 5 inserts the positioning pin 4e of the tool rest 4 into the positioning hole 5c of the main body portion 5a, and tightens the main body portion 5a to one side surface of the tool rest 4 with the fixing screw 15 in this state. 4 is fixed to one side surface.

  At this time, the cutter blade 5 is fixed to the tool post 4 in a posture orthogonal to the frame 1, and has a tilted posture in which the blade edge portion 5 b is positioned below the main body portion 5 a. Further, the attachment position of the cutter blade 5 to the tool post 4 is such that the tip (lower end) of the blade edge portion 5b is located at the intermediate position in the width direction of the frame 1 in a state where the tool post 4 is attached to the frame 1. Yes. Furthermore, the cutting angle α (FIG. 12) formed by the side of the cutting edge portion 5b on the traveling direction side of the cutter blade 5 and the surface of the plate P to be cut is set to an acute angle. The reason why the cut angle α is an acute angle is to reduce the notch resistance of the plate P to be cut by the cutter blade 5.

  The cutter blade 5 is not limited to the cutter blade 5 described above, and may have any shape as long as it has a cutting edge portion 5b and can be attached to the tool post 4. Moreover, it is good also considering the double blade 5d formed in the blade edge | tip part 5b as a single blade.

  Next, the case where the surface of the to-be-cut plate P such as a hard plastic plate is cut out in a circle using the above-described circular cutting cutter, or the cut-out plate is cut out in a circle will be described.

  First, the fixing member 14 is loosened so that the tool post 4 can be slid in the longitudinal direction of the frame 1, and the surface of the plate P to be cut is cut into a circle or the plate to be cut is cut into a circle. The tool rest 4 is moved along the frame 1, and the tool rest 4 is fixed to the frame 1 by a fastening operation of the fixing member 14 at a predetermined position.

  Next, the suction cup 6 of the support means 2 is vacuum-adsorbed on the surface of the cut plate P placed on a cutting mat or the like using the support means 2, and the circular cutter is moved from the suction cup 6 of the support means 2 to the cut plate P. Adsorb and hold on the surface.

  Thereafter, the knob 9 of the support means 2 is pressed toward the cut plate P with one hand so that the support means 2 does not move with respect to the cut plate P, and the turning operation portion 3 is moved with the other hand. The operating shaft 13 is picked so that the tip of the cutting edge portion 5b of the cutter blade 5 is pressed against the surface of the plate P to be cut.

  In this state, while holding the knob 9 of the support means 2 with one hand, the operation shaft 13 of the turning operation unit 3 is rotated clockwise in a plan view, and is covered at the tip of the cutting edge 5b of the cutter blade 5. The cutter blade 5 is moved so as to scrape the surface of the cutting plate P (see FIG. 10). Then, the frame 1 rotates in the horizontal direction around the axis of the support means 2, and the cutter blade 5 provided on the tool post 4 draws a circular path along with this, and at the tip of the cutting edge portion 5 b of the cutter blade 5. A circular groove is carved on the surface of the plate to be cut P, and the plate to be cut P can be cut out in a circle, or the plate to be cut P can be cut out in a circle.

  When the surface of the plate P to be cut is cut into a circle, the cutter blade 5 is repeatedly circulated around the axis φ of the support means 2 so that a cut is made to about half the thickness of the plate P to be cut. . Thereafter, using a breaker (not shown) having a bifurcated tip, the outer peripheral edge of the plate to be cut P is clamped by the fork of the breaker, and the breaker is folded on the plate P to be cut. By swinging in the bending direction, the outer peripheral edge of the plate to be cut P is folded along the cut line. Thereby, a circular board can be obtained.

  When the cut plate P is cut out in a circular shape, the cutter blade 5 is repeatedly turned around the axis of the support means 2 so that a cut is formed by the thickness of the cut plate P. Accordingly, a part of the plate to be cut P can be cut out into a complete circle, and the plate to be cut P can be cut out into a circle or a circular plate can be obtained.

  In the above-described circular cutting cutter, the abutting portion 4d of the tool post 4 slides on the surface of the plate to be cut P when the frame 1 turns, and the cutting edge portion 5b of the cutter blade 5 and the surface of the plate to be cut P are formed. In order to keep the cutting angle constant, even if there is a clearance between the frame 1 and the support means 2 that supports the frame 1 so as to be able to turn, the frame 1 and the cutter blade 5 are moved by the abutting portion 4d of the tool post 4. It is possible to prevent rattling, and the cutting angle of the cutter blade 5 into the plate P to be cut is always maintained at a constant suitable angle. As a result, it is possible to smoothly and satisfactorily cut and cut the cut plate P with the cutter blade 5.

  Moreover, since the abutting part 4d of the tool post 4 is in line contact (or point contact) with the surface of the plate to be cut P, the circular cutter has a notch or cutout of the plate P to be cut by the cutter blade 5. Even if the contact portion 4d of the tool post 4 slides on the surface of the plate P, the frictional resistance does not increase and the frame 1 can be easily turned.

  Furthermore, since the cutting means is provided with the suction cup 6 in which the supporting means 2 is vacuum-sucked on the surface of the plate to be cut P, the surface of the plate to be cut P can be prevented from being damaged and misaligned. Can be cut into a perfect circle or cut into a perfect circle.

  In the above embodiment, the position of the support means 2 with respect to the frame 1 is fixed, and the tool post 4 provided with the cutter blade 5 is slidably provided on the frame 1, but in other embodiments, The tool post 4 provided with the cutter blade 5 may be fixed to a predetermined position of the frame 1 and the support means 2 may be provided slidably on the frame 1.

  In the above embodiment, the support means 2 is provided at one end of the frame 1. However, in another embodiment, the support means 2 may be provided at the center of the frame 1. Further, the support means 2 is not limited to the support means 2 described above, and may have any structure and shape as long as the frame 1 can be supported so as to be pivotable in a horizontal direction at a fixed position.

  In the above embodiment, the turning operation unit 3 is provided in the frame 1 and the frame 1 is turned in the horizontal direction by the turning operation unit 3. However, in other embodiments, the turning operation unit 3 is omitted. The frame 1 or the fixing member 14 may be held to turn the frame 1 in the horizontal direction.

  In the illustrated example of the embodiment of the steam, the abutting portion 4d formed by a protrusion having a round cross section is illustrated, but the abutting portion may be formed by a hemispherical convex portion to make point contact.

  1 is a frame, 1A is a frame body, 1B is a first support plate, 1C is a second support plate, 1a is a top plate, 1b is a side plate, 1c is a guide hole, 1d is a first through hole, and 1e is a second through hole. 1f is a first support hole, 1g is a second support hole, 1h is an annular protrusion, 2 is a support means, 3 is a turning operation unit, 4 is a tool post, 4a is a sliding part, 4b is a screw shaft, 4c Is an arm part, 4d is an abutting part, 4e is a positioning pin, 5 is a cutter blade, 5a is a main body part, 5b is a cutting edge part, 5c is a positioning hole, 5d is a double blade, 6 is a suction cup, 6a is a concave surface, and 7 is a first surface. 1 sleeve, 8 support shaft, 8a substrate portion, 8b shaft portion, 9 knob portion, 9a cylinder portion, 9b disc portion, 10 presser plate, 10a through hole, 10b concave surface, 11 2 sleeves, 12 nuts, 13 operating shafts, 13a small diameter shafts, 13b large diameter shafts, 14 fixing members, 15 fixed Di, P is to be cut plate, alpha is cut angle, phi is the axis.

Claims (5)

  An elongated frame; a support means provided on the frame for supporting the frame so as to be pivotable in a horizontal direction on a plate to be cut; a tool rest provided on the frame; and the frame on the tool rest. A cutter blade fixed in an orthogonal posture, the distance between the support means and the tool post can be variably adjusted, and the frame is swung horizontally on the plate to be cut by the support means. The surface of the plate to be cut is cut into a circle or the plate to be cut is cut into a circle, and the tool post is formed to project from the side of the frame toward the turning direction. And a contact portion that slides on the surface of the plate to be cut when the frame is turned to maintain a constant cutting angle formed by the cutting edge of the cutter blade and the surface of the plate to be cut. Rounded Cutter.   The circular cutting cutter according to claim 1, wherein the contact portion of the tool post includes a convex portion having a rounded cross section.   The blade edge portion of the cutter blade has an inverted triangular shape in a side view, and the cutting angle formed by the side of the blade edge portion on the traveling direction side of the cutter blade and the surface of the plate to be cut is an acute angle. The circular cutting cutter according to 1.   The circular cutting cutter according to claim 1, further comprising a turning operation unit which is provided on the upper surface side of the frame so as to be rotatable around a vertical axis and which turns the frame in a horizontal direction.   The support means includes a suction cup that is attracted to the surface of the plate to be cut, a support shaft that is erected at the center of the suction cup and rotatably supported by the frame, and is rotatably screwed to the outer peripheral surface of the support shaft. And a presser that is interposed between the lower surface of the frame and the suction cup and presses the outer peripheral edge of the suction cup toward the surface side of the plate to be cut. And the central portion of the suction cup adsorbed on the surface of the plate to be cut by the clamping operation of the knob portion 9 to the support shaft is pulled up via the support shaft, and between the suction surface of the suction cup and the surface of the plate to be cut The circular cutting cutter according to claim 1, wherein a vacuum space is formed on the outer periphery of the suction cup and the outer peripheral edge of the suction cup is pressed against the surface of the plate to be cut by the presser.