JPS608958Y2 - circle cutter - Google Patents

Description

【考案の詳細な説明】 本考案は、紙やビニールシートやじゅうたん等の様な平
面部材の一部を円状に切る為の円切り抜きカッターに関
する。[Detailed Description of the Invention] The present invention relates to a circular cutter for cutting a part of a flat material such as paper, vinyl sheet, carpet, etc. into a circular shape.

従来、この種の円切り抜きカッターとしては、針状芯体
を用いてこれを被切断物に突き刺して、中心とする例え
ば実開昭５２−１１９５８６号、同５３−２３０８峰、
同５３−２３０９吋、同５３−２４５９０号等に開示さ
れた有針型のものと、比較的面積の広い座板を備えた芯
体を用いてこれを被切断物に押当てて中心とする例えば
実開昭５２−１３６２８峰等に開示された無針型のもの
とが知られている。Conventionally, this type of circular cutter uses a needle-like core that is pierced into the object to be cut so as to center the cutter.
Using the needle type disclosed in No. 53-2309, No. 53-24590, etc., and a core body equipped with a relatively wide seat plate, this is pressed against the object to be cut to center it. For example, a needleless type disclosed in Japanese Utility Model Application Publication No. 52-13628 is known.

ところが、有針型のものは、中心を定確化できるものの
被切断物に針痕が付き、内部分以外が必要な場合は良い
が、内部分自体が必要な場合には針痕が残るので問題で
あった。However, with the needle type, although the center can be determined, needle marks are left on the object to be cut, and while it is fine if something other than the inner part is needed, needle marks remain if the inner part itself is required, which is a problem. Met.

他方、無針型のものは、有針型とは逆に、被切断物に針
痕が付かないものの中心を定確化し難かった。On the other hand, the needleless type, contrary to the needle type, does not leave needle marks on the object to be cut, but it is difficult to determine the center.

とりわけ、実開昭５２−１３６２８峰に開示されたもの
は、芯体に対して座板がボールジヨイントに依り揺動自
在に連結されているので、芯体の押圧力が座板に適確に
伝達されず、被切断物に対して座板が辷り易かった。In particular, in the device disclosed in Japanese Utility Model Application No. 52-13628, the seat plate is swingably connected to the core body by a ball joint, so that the pressing force of the core body is applied to the seat plate appropriately. It was difficult for the seat plate to slide over the object to be cut.

本考案は、成上の問題点に鑑み、これを解消する為に創
案されたもので、その目的とする処は、切断後の必要な
被切断物に針痕を残さない様にできると共に、切断時に
は中心を定確化できる円切り抜きカッターを提供するに
ある。The present invention was devised in order to solve the above problems, and its purpose is to prevent needle marks from being left on the object to be cut after cutting, and to To provide a circle cutter capable of determining the center during cutting.

本考案の円切り抜きカッターは、被切断物に当合し得る
広い面積の下面と一方の手で把持し得る外周面とを夫々
備え被切断物上に置かれて旋回可能な本体と、本体の略
中夫に旋回並びに上下動自在に設けられると共にその下
部には被切断物に押接される比較的面積の広い座面が設
けられた中空状の第一芯体と、上部には他方の手で下圧
する押圧部が下部には被切断物に突き刺し得る鎧部が夫
々設けられて第−芯体内に昇降可能に螺合された第二芯
体と、本体に対して半径方向に移動できると共にその適
宜位置に固定できる摺動体と、摺動体に設けられて被切
断物を切断する刃体とから構成した事に特徴が存する。The circular cutter of the present invention has a main body that is rotatable when placed on the object to be cut, and has a lower surface with a wide area that can come into contact with the object to be cut, and an outer peripheral surface that can be gripped with one hand. A hollow first core body is provided to be able to rotate and move up and down approximately in the center shaft, and a hollow first core body is provided at its lower part with a seat surface having a relatively wide area that presses against the object to be cut, and the upper part is provided with a first core body that is rotatable and movable up and down. A pressing part that is pressed down by hand is provided with an armor part at the bottom that can pierce the object to be cut, and is movable in the radial direction with respect to the second core body which is screwed into the first core body so as to be able to move up and down, and the main body. It is characterized in that it is composed of a sliding body that can be fixed at an appropriate position, and a blade that is installed on the sliding body and cuts the object to be cut.

以下、本考案の実施例を、図面に基づいて説明する。Embodiments of the present invention will be described below based on the drawings.

円切り抜きカッター１０は、本体１２、芯体１４、刃体
１６、摺動体１８とからその主要部が構成されている。The main parts of the circular cutter 10 include a main body 12, a core body 14, a blade body 16, and a sliding body 18.

本体１２は、被切断物２００に当合し得る広い面積の下
面を備えた環状平板部２０と、これの内周近傍箇所に於
て上方に突出し一方の手で把持し得る外周面を備えた筒
部２２と、環状平板部２０の直径に沿って設けられた適
数のリブ２４と、これの中央つまり本体１２の中心部分
に設けたボス２６とを備えている。The main body 12 includes an annular flat plate part 20 with a wide lower surface that can come into contact with the object to be cut 200, and an outer peripheral surface that protrudes upward near the inner periphery and can be gripped with one hand. It includes a cylindrical portion 22, an appropriate number of ribs 24 provided along the diameter of the annular flat plate portion 20, and a boss 26 provided at the center thereof, that is, at the center portion of the main body 12.

筒部２２は、摺動体１８の半径方向の移動に支障がない
様にその前部には切欠３２が形成されて後部には貫孔３
４が穿設されて居り、外周面には辷り止めの多数の凹凸
３６が造形されている。The cylindrical part 22 has a notch 32 formed in its front part and a through hole 3 in its rear part so as not to hinder the movement of the sliding body 18 in the radial direction.
4 is bored, and a large number of protrusions and recesses 36 are formed on the outer peripheral surface to prevent slipping.

リブ２４の一つは、摺動体１８のガイドレール２８とし
て利用され、これは横方向に離間した二つの対称形の段
付突条３０から構成されている。One of the ribs 24 serves as a guide rail 28 for the slide 18, which consists of two laterally spaced symmetrical stepped ridges 30.

ボス２６の外周上部には、雄螺子３８が刻設されている
。A male screw 38 is carved on the upper outer periphery of the boss 26.

本体１２の各部分は、合成樹脂材料等で一体的に成形さ
れている。Each part of the main body 12 is integrally molded from a synthetic resin material or the like.

摺動体１８は、芯体１４と刃体１６との距離、つまり半
径を可変する為に設けられるもので、これは本体１２に
形設したガイドレール２Ｂに対して摺動自在に設けられ
ている。The sliding body 18 is provided to vary the distance between the core body 14 and the blade body 16, that is, the radius, and is slidably provided on the guide rail 2B formed in the main body 12. .

摺動体１８は、ガイドレール２８の両方の段付突条３０
に跨って支持案内されるべくその断面形状は倒立略Ｕ字
型を為し、その上壁の長手方向には長孔４０が穿設され
、これに依り摺動体１８の所定以上の移動は防止される
。The sliding body 18 is connected to both stepped protrusions 30 of the guide rail 28.
Its cross-sectional shape is an inverted U-shape in order to be supported and guided astride the upper wall, and a long hole 40 is bored in the longitudinal direction of the upper wall, thereby preventing the sliding body 18 from moving beyond a predetermined value. be done.

つまり、本体１２のボス２６に当合規制されてガイドレ
ール２８から離脱しない様に構成され、長孔４０の長さ
分だけ摺動体１８が移動できる。In other words, the sliding body 18 is configured so as to be prevented from coming off the guide rail 28 by being restricted by the boss 26 of the main body 12, and the sliding body 18 can move by the length of the elongated hole 40.

摺動体１８は、ガイドレール２８に対して移動できる範
囲に於て、その適宜の位置にロックできる様に為されて
いる。The sliding body 18 is configured so that it can be locked at an appropriate position within a range in which it can move relative to the guide rail 28.

このロック機構は、ボス２６の雄螺子３８と、これに螺
合されるナツト４２と、摺動体１８とナツト４２との間
に介設されるワッシャ４４とから構成されている。This locking mechanism is composed of a male screw 38 of the boss 26, a nut 42 screwed onto the male screw 38, and a washer 44 interposed between the sliding body 18 and the nut 42.

摺動体１８は、金属板等にて作製され、この前部には刃
体１６を取付ける様にしている。The sliding body 18 is made of a metal plate or the like, and the blade 16 is attached to the front part of the sliding body 18.

則ち、摺動体１８の前部には、垂片４６が造形されて居
り、これには平面略Ｕ字型を為す刃体受板４８が当てか
われる。That is, a hanging piece 46 is formed on the front part of the sliding body 18, and a blade receiving plate 48 having a substantially U-shape in plan is applied to this piece.

この時、刃体受板４８の溝部内に垂片４６を位置せしめ
ると共に、その両フランジ部５０を垂片４６から後方に
突出させている。At this time, the hanging piece 46 is positioned within the groove of the blade receiving plate 48, and both flanges 50 are made to protrude rearward from the hanging piece 46.

垂片４６並びに刃体受板４８には、貫孔５２゜５４が夫
々穿設され、これらにはボルト５６が挿通されてボルト
５６の螺子部には締付ナツト５８が螺合される。Through holes 52 and 54 are formed in the hanging piece 46 and the blade receiving plate 48, respectively, and a bolt 56 is inserted through these, and a tightening nut 58 is screwed into the threaded portion of the bolt 56.

そして、ボルト５６の円板状頭部６０の一部を切欠いて
、この切除部６２を刃体受板４８の一方のフランジ部５
０に当合させ、所謂廻り止めしである。Then, a part of the disk-shaped head 60 of the bolt 56 is cut out, and this cut out part 62 is attached to one flange part of the blade receiving plate 48.
This is what is called a rotation stopper.

更に、ボルト５６の無螺子部と螺子部との境に形設した
溝には、スナップリング６４が嵌着され、ボルト５６が
垂片４６並びに刃体受板４８から離脱しない様に構成し
である。Further, a snap ring 64 is fitted into a groove formed at the boundary between the non-threaded portion and the threaded portion of the bolt 56, so that the bolt 56 is configured to not separate from the hanging piece 46 and the blade receiving plate 48. be.

刃体１６は、ボルト５６の頭部６０と垂片４６との間に
挿入され、締付ナツト５８を螺締する事に依り固定され
る。The blade body 16 is inserted between the head 60 of the bolt 56 and the hanging piece 46, and is fixed by screwing the tightening nut 58.

刃体１６は、平行四辺形を為すものが通常用いられ、一
方の短辺には刃６６が形成されていると共に、上半身に
は取扱時の安全を図る為に保護用チューブ６８が外嵌し
である。The blade body 16 is usually in the shape of a parallelogram, with a blade 66 formed on one short side, and a protective tube 68 fitted around the upper body for safety during handling. It is.

刃体１６の下方への突出量、つまり切込量は、被切断物
２００の厚さに呼応して取扱者が任意に加減して定める
。The amount of downward protrusion of the blade 16, that is, the depth of cut, is determined by the operator as desired depending on the thickness of the object 200 to be cut.

本体１２の一部には、交換用の刃体１６や他の付属部品
等を収納するポケット７０が設けられている。A pocket 70 is provided in a part of the main body 12 to store a replacement blade 16 and other accessories.

これは、ガイドレール２８の使用しない空間を利用して
居り、開閉自在な蓋７２を備えている。This utilizes the unused space of the guide rail 28 and includes a lid 72 that can be opened and closed.

蓋７２は、折線７４の箇所で開閉し、その端部には掛片
７６が形設され、本体１２側にはこれが嵌合される掛止
部７８が設けられている。The lid 72 opens and closes at a fold line 74, and a hook 76 is formed at the end thereof, and a hook 78 into which this is fitted is provided on the main body 12 side.

摺動体１８には目盛８０が、本体１２のリブ２４には中
心位置を示す基点中８２が夫々刻設等して表記され、芯
体１４と刃体１６との距離を目視できる様にしている。The sliding body 18 is marked with a scale 80, and the rib 24 of the main body 12 is marked with a reference point 82 indicating the center position, so that the distance between the core body 14 and the blade body 16 can be visually observed. .

この例では、切断できる直径を表示する様にしているが
半径を表わしても良い。In this example, the diameter that can be cut is displayed, but the radius may also be displayed.

又、目盛８０を基点中８２を前述とは逆に設ける事もで
きる。Further, the scale 80 can be set as the reference point and the middle 82 can be provided in the opposite direction to that described above.

芯体１４は、第一芯体９８と、第二芯体１０２とから戒
り、第一芯体９８の内部は中空にしである。The core body 14 is separated from a first core body 98 and a second core body 102, and the inside of the first core body 98 is hollow.

具体的には、軸部８８と着座部９０とを金属棒等から切
削して造形し、その内部は中空にされ、下半分には雌螺
子１０８が刻設されている。Specifically, the shaft portion 88 and the seating portion 90 are cut and shaped from a metal rod or the like, and the inside thereof is hollow, and a female screw 108 is carved in the lower half.

着座部９０には、性情９６が凹設され、ここには中央に
孔を有するリング状の摩擦体９４が嵌着しである。The seating portion 90 has a recess 96 into which a ring-shaped friction body 94 having a hole in the center is fitted.

第一芯体９８は、その軸部８８がボス２６の支承孔９２
に遊嵌された後、軸部８８の上部にはビニールチューブ
等のストッパ１１０が嵌設される。The shaft portion 88 of the first core body 98 is connected to the support hole 99 of the boss 26.
After the shaft part 88 is loosely fitted, a stopper 110 such as a vinyl tube is fitted to the upper part of the shaft part 88.

第二芯体１０２は、上部に押圧部８６を備えると共に、
軸１１２の下部には雄部１００が形成され、軸１１２に
は雌螺子１０８に適合する雌螺子１１４が螺設されてい
る。The second core body 102 includes a pressing part 86 on the upper part, and
A male portion 100 is formed at the bottom of the shaft 112, and a female screw 114 that fits the female screw 108 is screwed onto the shaft 112.

押圧部８６は、合成樹脂等にして金属製の軸１１２とは
押圧部８６の成形特に一体にしたり若しくはその後両者
を離脱不能に嵌合する様にしている。The pressing portion 86 is made of synthetic resin or the like and is molded, particularly integrally, with the metal shaft 112, or the two are then fitted together irreleasably.

更に、第一芯体９８の着座部９０より大きい着座体１０
６を必要に応じて取付は得る様にしている。Furthermore, the seating body 10 is larger than the seating portion 90 of the first core body 98.
6 will be installed as necessary.

着座体１０６も性情１１６が設けられ、これに摩擦体１
１８が嵌着しである。The seating body 106 is also provided with a feeling 116, and a friction body 1 is attached to this.
18 is fitted.

而して、第一芯体９８への取付けは、雌螺子１０８を利
用し、これが為に同体１０６には雄螺子部１２０が造形
されていると共に、着座部９０の摩擦体９４には雄螺子
部１２０が干渉しない様に孔が設けである。For attachment to the first core body 98, a female screw 108 is used.For this purpose, a male screw portion 120 is formed on the body 106, and a male screw portion 120 is formed on the friction body 94 of the seating portion 90. A hole is provided so that the portion 120 does not interfere.

着座体１０６の雄螺子部１２０の内部には、上方に開放
した受孔１２２が設けられているが、これはここへ第二
芯体１０２の雄部１００を当接させ、所謂第一芯体９８
に対して第二芯体１０２が不用意に螺動しない様にする
為のものである。A receiving hole 122 that opens upward is provided inside the male screw portion 120 of the seating body 106, and the male portion 100 of the second core body 102 is brought into contact with this receiving hole 122, so that the so-called first core body 98
This is to prevent the second core body 102 from inadvertently screwing against the second core body 102.

次に、この様な構成に基づいて作用を連層する。Next, actions are layered based on such a configuration.

先ず、ナツト４２を緩めて摺動体１８を所望する半径位
置へ移動させ再びナツト４２を螺締してこれを固定する
。First, the nut 42 is loosened, the sliding body 18 is moved to a desired radial position, and the nut 42 is screwed again to fix it.

この時、目盛８０と基点間８２を利用して半径若しくは
直径を設定する。At this time, the radius or diameter is set using the scale 80 and the base point interval 82.

次いで、締付ナツト５８を緩めて刃体１６の下部量を被
切断物２００に呼応した量に定め、再び締付ナツト５８
にて摺動体１８側へ固定する。Next, loosen the tightening nut 58 to set the lower part of the blade 16 to an amount that corresponds to the object to be cut 200, and then tighten the tightening nut 58 again.
to fix it to the sliding body 18 side.

そして、内部分自体が必要で所望する円が大きい場合は
、第６図に示す如く着座体１０６を装着したままとし、
所望する円が小さい場合、例えば刃体１６が着座体１０
６に当触する様な半径の場合は第１０図に示す如く着座
体１０６を離脱する。If the inner part itself is necessary and the desired circle is large, leave the seat 106 attached as shown in FIG.
If the desired circle is small, for example, the blade 16 is
6, the seating body 106 is removed as shown in FIG.

逆に、内部分以外の残りの部分が必要な場合は、第一芯
体９８に対して第二芯体１０２を螺降させ、その雄部１
００を第１１図に示す如く下部させる。On the other hand, if the remaining part other than the inner part is required, the second core body 102 is screwed down onto the first core body 98 and the male part 1
00 at the bottom as shown in FIG.

又、第二芯体１０２の雄部１００の突き刺し量を加減し
たい場合は、第１２図に示す如く第一芯体９８の着座部
９０の位置を適宜定め、所謂併用する。Moreover, if it is desired to adjust the amount of piercing of the male part 100 of the second core body 102, the position of the seating part 90 of the first core body 98 is appropriately determined as shown in FIG. 12, and the two are used together.

以上の準備が終れば、被切断物２００の切断すべき箇所
に円切り抜きカッター１０を置き、押圧部８６を指で下
方に押圧し、着座体１０６、着座部９０、雄部１００の
いずれか若しくは着座部９０と雄部１００を併用して被
切断物２００の中心部分に強接させる。When the above preparations are completed, place the circular cutter 10 at the location where the object to be cut 200 is to be cut, press the pressing part 86 downward with your finger, and remove any one of the seating body 106, the seating part 90, the male part 100, or The seating part 90 and the male part 100 are used together to forcefully contact the center part of the object to be cut 200.

この押圧動作に依り円切り抜きカッター１０としては、
支軸を得たことになる。Due to this pressing operation, the circular cutter 10
This means that you have gained a pivot.

次いで、本体１２の筒部２２の外周面を把持し、芯体１
４を気侭として同本体１２を回転させる。Next, grasp the outer peripheral surface of the cylindrical portion 22 of the main body 12 and remove the core 1.
The main body 12 is rotated with 4 in the air.

この時、凹凸３６に依り辷る事が無い。押圧部８６は、
一方の手で押圧すると共に、本体１２は他方の手で把持
する。At this time, it does not trip over the unevenness 36. The pressing part 86 is
While pressing with one hand, the main body 12 is gripped with the other hand.

本体１２を回転させれば、これに摺動体１８を介して固
定された刃体１６の刃６６に依り被切断物の一部には円
形状が切断される事になる。When the main body 12 is rotated, the blade 66 of the blade 16 fixed to the main body 12 via the sliding member 18 cuts a circular shape on a part of the object.

芯体１４は、本体１２に対して上下動も出来得る様に構
成しであるから、被切断物２００の上面に本体１２の下
面を常に密着させる事ができ、芯体１４並びに刃体１６
は常に垂直状態を為して斑なく均一に切断できる。Since the core body 14 is configured to be able to move up and down relative to the main body 12, the lower surface of the body 12 can always be brought into close contact with the upper surface of the object to be cut 200, and the core body 14 and the blade body 16
The blade is always in a vertical position and can be cut uniformly without unevenness.

以上既述した如く、本考案に依れば、次の様な優れた効
果を奏する事ができる。As described above, according to the present invention, the following excellent effects can be achieved.

（１）内部分以外が必要な場合には第二芯体の雄部を使
い、内部分自体が必要な場合には第一芯体の着座部を使
う様にしたので、切断後の必要な被切断物には針痕が付
くことがない。(1) When a part other than the inner part is required, the male part of the second core is used, and when the inner part itself is required, the seating part of the first core is used, so the necessary No needle marks are left on the object to be cut.

（２）内部分以外が必要な場合には第二芯体の雄部を使
うので、切断時には中心を定確化できる。(2) If a part other than the inner part is required, the male part of the second core is used, so the center can be determined when cutting.

内部分自体が必要な場合には第一芯体の着座部を使うが
、第一芯体は本体に対して旋回並びに上下動自在に設け
られこれに第二芯体が螺設されているので、第二芯体の
押圧力が着座部に適確に伝達され、従来の無針型のもの
に比較して切断時の中心を定確化できる。If the inner part itself is required, the seating part of the first core is used, but the first core is provided so that it can pivot and move up and down relative to the main body, and the second core is screwed onto it. The pressing force of the second core body is accurately transmitted to the seating portion, and the center during cutting can be more accurately determined than in the conventional needleless type.

その結果、何れの芯体を使った場合でも、中心を定確化
でき、切断作業が行ない易いと共に、精度の高い円切り
が行なえる。As a result, no matter which core is used, the center can be determined, the cutting operation can be easily performed, and highly accurate circular cutting can be performed.

（３）第一芯体と第二芯体を同軸状に備えているので、
これらを併用する事ができる。(3) Since the first core body and the second core body are provided coaxially,
These can be used together.

この場合、第一芯体の着座部に依り第二芯体の雄部の突
き刺し量が加減されると共に、第二芯体の雄部に依り第
一芯体の着座部の辷りを防ぐ様になるので、大きな針痕
が付かず、とりわけ大きな円を切抜く場合は安定した切
断が行なえる。In this case, the amount of penetration of the male part of the second core is adjusted depending on the seating part of the first core, and the seating part of the first core is prevented from sliding depending on the male part of the second core. Therefore, no large needle marks are left, and stable cutting can be performed, especially when cutting out large circles.

（４）構造も比較的簡単であるので、安価なものにでき
る。(4) Since the structure is relatively simple, it can be made inexpensive.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案の実施例に係る円切り抜きカッターの全
体態様を示す平面図、第２図は第１図の■−■線縦断正
面図、第３図は底面図、第４図は右側面図、第５図は芯
体を下げた状態を示す左側面図、第６図は第１図のＶｌ
−ＶＩ線縦断拡大正面図、第７図は第１図の■−■線縦
断拡大正面図、第８図は第１図の■−■矢視拡大側面図
、第９図は要部底面図、第１０図は第一芯体の着座部を
用いた場合の要部拡大正面図、第１１図は第二芯体を用
いた場合の同様図、第１２図は第一芯体の着座部と第二
芯体を用いた場合の同様図である。 １０は円切り抜きカッター、１２は本体、１４は芯体、
１６は刃体、１８は摺動体、２００は被切断物。Fig. 1 is a plan view showing the overall aspect of a circular cutter according to an embodiment of the present invention, Fig. 2 is a longitudinal sectional front view taken along the line ■-■ of Fig. 1, Fig. 3 is a bottom view, and Fig. 4 is a right side view. Top view, Figure 5 is a left side view showing the state in which the core is lowered, Figure 6 is the Vl of Figure 1.
- VI line enlarged longitudinal front view, Fig. 7 is a vertical enlarged front view taken along the ■-■ line in Fig. 1, Fig. 8 is an enlarged side view taken along the -■ arrow direction in Fig. 1, and Fig. 9 is a bottom view of main parts. , Fig. 10 is an enlarged front view of the main part when the seating part of the first core body is used, Fig. 11 is a similar view when the second core body is used, and Fig. 12 is the seating part of the first core body. It is a similar view when a second core body is used. 10 is a circular cutter, 12 is a main body, 14 is a core body,
16 is a blade, 18 is a sliding body, and 200 is an object to be cut.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 被切断物に当合し得る広い面積の下面と一方の手で把持
し得る外周面とを夫々備え被切断物上に置かれて旋回可
能な本体と、本体の略中夫に旋回並びに上下動自在に設
けられると共にその下部には被切断物に押接される比較
的面積の広い座面が設けられた中空状の第一芯体と、上
部には他方の手で下圧する押圧部が下部には被切断物に
突き刺し得る鎧部が夫々設けられて第−芯体内に昇降可
能に螺合された第二芯体と、本体に対して半径方向に移
動できると共にその適宜位置に固定できる摺動体と、摺
動体に設けられて被切断物を切断する刃体とから構成し
た事を特徴とする円切り抜きカッター。The main body has a wide lower surface that can come into contact with the object to be cut and an outer peripheral surface that can be gripped with one hand, and can be placed on the object to be cut and rotated. A hollow first core body that can be freely installed and has a relatively wide seating surface at the bottom that presses against the object to be cut, and a pressing part at the top that is pressed down with the other hand at the bottom. A second core body is provided with an armor portion that can pierce the object to be cut and is screwed into the first core body so as to be able to move up and down, and a sliding member that can be moved in the radial direction with respect to the main body and can be fixed at an appropriate position. A circular cutter characterized by comprising a moving body and a blade body provided on the sliding body to cut an object to be cut.