JP4066204B2

JP4066204B2 - Sheet material cutting device

Info

Publication number: JP4066204B2
Application number: JP08343397A
Authority: JP
Inventors: 順一中尾
Original assignee: Hitachi Metals Ltd
Current assignee: Hitachi Metals Ltd
Priority date: 1997-03-18
Filing date: 1997-03-18
Publication date: 2008-03-26
Anticipated expiration: 2017-03-18
Also published as: JPH10264086A

Description

【０００１】
【発明の属する技術分野】
本発明は、複写機、ファクシミリ、プリンタ等に使用されるシート材を切断するのに用いられるシート材切断装置に関するものである。
【０００２】
【従来の技術】
複写機、ファクシミリ、プリンタなどの記録装置に搭載されているシート材切断装置としては、実開平４−１２８１９５号公報などに開示される被切断シート材の切断幅方向に延長された直線刃先の固定刃に円板刃またはナイフエッジ状の刃物を圧接摺動させながら移動して切断する切断装置、あるいは、特開平７−５２０８５号公報、特開平２−２５０７９３号公報、特開平８−５７７９７号などに開示される刃先を交接させた２枚の円板刃を切断方向に移動させてシート材を切断する切断装置など刃物移動型のシート材切断装置が提案されている。これらの刃物移動型のシート材切断装置は、他のロータリ型やスライド型の切断装置に比し切断幅の制約が少なく、小形化に有利で切断の際の刃物の駆動負荷が小さいという利点がある。さらに、２枚円板刃の切断装置は長尺の直線固定刃を必要としないので、一層切断幅の制約が少なく小形化に有利で広く用いられている。
【０００３】
【発明が解決しようとする課題】
一方、シート材切断装置は一層のコスト低減が要求されるとともに切断回数の長寿命化の要望が強くなっている。そこで、本発明は安価な刃物材料を使用しながら寿命の長いシート材切断装置を提供することを目的とするものである。
【０００４】
【課題を解決するための手段】
上記目的を達成するために本発明のシート材切断装置は、２枚の円板刃を備えたキャリッジを切断幅方向に差し渡された案内レール上を往復移動させてその交接する刃先でシート材を切断するシート材切断装置において、前記２枚の円板刃の刃先を圧接摺動させる圧接手段と、該２枚の円板刃の刃先を被切断シート材を引き込む方向に回転させ、かつ相互の刃先の周速に５％〜３０％の差を与えて前記２枚の円板刃を回転駆動させる刃回転駆動手段とを設け、刃先のセルフドレッシングにより刃先寿命を向上させたことを特徴とするものである。
【０００５】
すなわち、本発明のシート材切断装置は上記の長尺の直線固定刃を要しないという利点を有する２枚円板刃の刃物移動型シート材切断装置を採用した。そして、圧接手段によって刃先を圧接させた２枚の円板刃の刃先は回転駆動手段によって切断時に被切断シート材を引き込む方向に回転させられるので切断が確実に行われる。さらに、回転駆動される２枚の円板刃先の周速には差が与えられているので、２枚の刃先が圧接して回転するときに両刃先に滑りが生じてセルフドレッシング効果が生じ、キャリッジの往復の度に刃先が研がれる状態になり、常に刃先の鋭利さが保たれて切断装置の切断寿命が増す。これにより、硬さが低く加工性が良くて安価な刃物材を使用しても切断寿命の長いシート材切断装置が得られる。
【０００６】
前記上下２枚の円板刃の刃先の周速の差は５％〜３０％にする。この周速の差が５％以下では上記のセルフドレッシング効果が不十分であり、３０％以上になると円板刃の回転負荷が大きくなりすぎるために回転が止まるなど切断に不具合が生ずるので、周速差は上記５％〜３０％が良い。このように、上下円板刃に周速差を設け、かつキャリッジの移動速度よりも円板刃の周速を大きくすることで被切断シート材を引き込む方向の力が働き、さらに被切断シート材を案内レールの通紙面に押しつけながら切断するので安定した切断ができる。
【０００７】
前記刃回転駆動手段は、外周が前記案内レールを表裏面に接し前記キャリッジの移動に伴って回転して前記２枚の円板刃をそれぞれ回転駆動する２個の回転部材からなることが簡易に円板刃を回転駆動できるので望ましい。この場合に２枚の円板刃の周速に差を設けるには、２個の回転部材の回転数は同じくして２枚の円板刃の径を変えてもよいし、あるいは摩擦駆動またはギヤ駆動などによりを同径の２枚の円板刃の回転数を変えるようにしてもよい。
【０００８】
さらに、前記２個の回転部材は、前記２枚の円板刃の軸にそれぞれ固着された径の異なる２個の回転体から構成されるようにすれば回転体が案内レールに接触して回転するときに同軸に固着された２枚の円板刃の回転数が異なるので簡易に２枚の円板刃の周速に差を設けることができる。
【０００９】
また、前記２枚の円板刃をトーイン角をもって圧接するようにすれば、円板刃の交接する面が減少してセルフドレッシング効果が増し、円板刃の回転駆動力の負荷が減少するとともに切断反力に対抗する圧接力の確保が容易になって切断がスムースにできる。この効果を達成するために好ましいトーイン角はＯ．２〜３．０度である。
【００１０】
【発明の実施の形態】
以下、本発明の実施の形態を図面により具体的に説明する。図１は本発明のシート材切断装置の実施形態のキャリッジの斜視図、図２は図１のＡ−Ａ矢視断面図、図３は円板刃のトーイン角を示す図、図４は切断時の円板刃先のセルフドレッシング状況を説明する図である。
【００１１】
これらの図において、案内レール２はほぼコ字型の中空断面の棹状をなし、シート材の進行方向に直交して図示しないフレームに固定されている。案内レール２のコ字型断面の辺の一部をなす上面板３の上面は被切断シート材の通紙面を形成し、上面板３の上面に被切断シート材を置くだけで切断操作が可能なフリーセット構造になっている。キャリッジ４は上刃物台６と案内部５を設けた下刃物台７とから構成され、上刃物台６と下刃物台７は前者の下面と後者の上面との間で被切断シートを通過させる隙間４ａを形成させて尾端の連結部６ａにより一体に接続されている。下刃物台７の案内部５が案内レール２のコ字型断面の内面を摺動してキャリッジ４を移動するようになっている。案内部５のほぼ中心部には、軸体１の外周に設けられた螺旋状案内路１ａに螺合する螺旋孔５ａが貫通して設けられ、軸体１が図示しない駆動手段により回転駆動されてキャリッジ４が前記案内レール２に沿って移動駆動されるようになっている。
【００１２】
上円板刃９と下円板刃１０は、図３に示すようにその刃先が互いに僅かに傾斜して、トーイン角θが付与されるようにしてその円周刃先を交接させ、それぞれ軸９ａと１０ａとにより上刃物台６と下刃物台７に回転自在に軸支されている。このトーイン角θは切断反力に対抗する圧接力を確保するとともに後述する刃先のセルフドレッシング効果を与えるために０．２〜３．０度にすることが望ましい。また、上円板刃９はコイルばね９ｂにより下円板刃１０に圧接するように付勢されている。これにより、両円板刃の刃先の交接点２２がシート材の切断点となっている。
【００１３】
上円板刃９と下円板刃１０には、図２に示すようにローラ（回転部材）１４及び１５が固着されている。ローラ（回転部材）１４及び１５の外周には弾性体リング１４ａ、１５ａが嵌装され、キャリッジ４が走行するときこの弾性体リング１４ａ、１５ａがそれぞれ案内レール２の上面板３の表裏面に接して回転し、上円板刃９と下円板刃１０の刃先が被切断シート材を引き込む方向に上下円板刃９、１０を回転させるようになって刃回転駆動手段が構成されている。また、上円板刃９の弾性体リング１４ａの外径は下円板刃１０の弾性体リング１５ａの外径より５％〜３０％大きくされている。これにより、下円板刃１０の回転数が上円板刃９の回転数より大きくなって、下円板刃１０の周速が上円板刃９の周速より大きくなり、その刃先間に滑りが生ずる。これによって、図４の斜線で示すように刃先が互いに研磨される状態のセルフドレッシング効果が生ずる。したがって、上下円板刃９、１０の両刃先が常に鋭利になって切断が行われるので、硬さの低い安価な刃物材を使用しても切断寿命を増すことができる。また、上下円板刃の周速がキャリッジの移動速度よりも大きいので、被切断シート材は刃先の噛み合い点で引き込まれる力が作用しながら切断され、切断が円滑になる。後述するようにこの外径差は５％〜３０％より大きくても小さくてもセルフドレッシング効果が少なくなる。
【００１４】
【実施例】
上記構成のシート材切断装置において、硬さＨＲｃ５１で厚さ０．２ｍｍの焼入鋼帯を打ち抜いて作成した上下同径の１３ｍｍφの円板刃を用い、弾性体リングの外径を変えたローラ（回転部材）を使用して、上下円板刃の周速差が０〜４０％になるようにして切断試験を行った。その結果を表１に示す。
【００１５】
【表１】

【００１６】
表の結果から以下のことが判る。すなわち、試料Ｎｏ．１の上下円板刃の周速が同一（周速差：０）の場合には切断寿命は２０，０００〜３０，０００回であった。これを周速差１０〜２０％にした試料Ｎｏ．１，Ｎｏ．２においては切断寿命が４０，０００〜５０，０００回に延びた。この結果から刃先の周速に差を与えて円板刃を回転することにより刃先に滑りが生じてセルフドレッシングが行われ刃先が研がれて切断寿命が寿命が向上することが判った。しかし、周速差を４０％にした場合は刃先間の摩擦が逆に大きくなり円板刃が円滑に回転しない場合が生じて正確な寿命が測定できなかった。これらの結果から、セルフドレッシング効果を達成するための円板刃の周速差は５〜３０％が好ましいことが判った。
【００１７】
以上説明したように、本発明構成のシート材切断装置によれば、被切断シート材の切断幅の制約の少ない２枚円板刃の刃物移動型シート材切断装置において、圧接摺動させた２枚の円板刃の刃先が被切断シート材を引き込む方向に回転させながら切断が行われるので切断を確実に行うことができる。さらに、回転する２枚の円板刃先の周速には差が与えられているので、回転時に２枚の刃先に滑りが生じて互いに研磨され、刃先にセルフドレッシング効果が生じて常に刃先の鋭利さが保たれる。これにより硬さの低い安価な刃物材で切断寿命の長いシート材切断装置が得られる。
【００１８】
上記セルフドレッシング効果を与えてかつ円滑な切断をするためには２枚の円板刃の刃先の周速の差は５％〜３０％が望ましい。本実施例では下円板刃の周速を大きくしたが、上円板刃の方の周速を大きくしても同様の安定した切断効果が得られる。
【００１９】
また、前記２枚の円板刃はトーイン角をもって圧接されるので、刃先の交接部の面積が減少し回転負荷が減少するとともにセルフドレッシング効果が増し、切断反力に対抗する圧接力の確保が容易になって切断がスムースにできる。この効果を達成するために好ましいトーイン角はＯ．２〜３．０度である。
【００２０】
なお、本実施形態では小形化に有利なキャリッジの移動方法として螺旋状案内路を有する軸体により移動駆動する方法を採用したが、その他キャリッジに連結したワイヤをプーリで牽引したり、歯付ベルトで駆動してキャリッジを移動する刃物移動型のシート材切断装置においても本発明を採用することはもとより可能である。
【００２１】
また、刃回転駆動手段として円板刃軸に固着した径差の異なるローラ（回転部材）を使用したが、ローラを円板刃軸と別個に設けたり、同径のローラを使用して歯車や摩擦車などにより２枚の円板刃の回転数を変えてもよい。
【００２２】
【発明の効果】
以上のべたように本発明のシート材切断装置によれば、切断の際のキャリッジの移動により切断の度に円板刃の刃先にセルフドレッシング効果が与えられるので、刃先の鋭利さが長く保たれて耐久寿命が増す。これにより、安価な加工性の良い刃物材料でも寿命の長い切断装置が得られるので、切断装置のコスト低減が可能になる。
【図面の簡単な説明】
【図１】本発明実施形態のシート材切断装置のキャリッジの斜視図である。
【図２】図１のＡ−Ａ矢視断面図である。
【図３】本発明実施形態のシート材切断装置の円板刃のトーイン角を示す図である。
【図４】円板刃の回転による刃先のセルフドレッシング状況を説明する図である。
【符号の説明】
１軸体
２案内レール
３上面板
４キャリッジ
５案内部
６上刃物台
７下刃物台
９上円板刃
９ａ上円板刃軸
９ｂコイルバネ（圧接手段）
１０下円板刃
１０ａ下円板刃軸
１４上ローラ（回転部材）
１４ａ弾性リング
１５下ローラ（回転部材）
１５ａ弾性リング
２２交接点（切断点）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet material cutting apparatus used for cutting a sheet material used for a copying machine, a facsimile, a printer, or the like.
[0002]
[Prior art]
As a sheet material cutting apparatus mounted on a recording apparatus such as a copying machine, a facsimile machine, or a printer, a straight blade edge extended in the cutting width direction of a sheet material to be cut disclosed in Japanese Utility Model Laid-Open No. 4-128195 is fixed. A cutting device that moves and cuts a disk blade or knife-edge-shaped blade while pressing and sliding on the blade, or JP-A-7-52085, JP-A-2-250793, JP-A-8-577797, etc. A blade-moving-type sheet material cutting device such as a cutting device that cuts a sheet material by moving two disk blades having the blade tips in contact with each other in the cutting direction has been proposed. These blade-moving-type sheet material cutting devices have the advantage that the cutting width is less restricted than other rotary-type and slide-type cutting devices, which is advantageous for downsizing and the driving load of the blade during cutting is small. is there. Furthermore, since the two-disc blade cutting device does not require a long straight fixed blade, the cutting width is less restricted and it is widely used in favor of downsizing.
[0003]
[Problems to be solved by the invention]
On the other hand, the sheet material cutting device is required to further reduce the cost, and there is a strong demand for extending the life of cutting. Therefore, an object of the present invention is to provide a sheet material cutting device having a long life while using an inexpensive blade material.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, a sheet material cutting device according to the present invention reciprocates a carriage provided with two disc blades on a guide rail that is passed in the cutting width direction, and uses the cutting edge that contacts the sheet material. In the sheet material cutting apparatus for cutting the two disk blades, the pressure contact means for pressing and sliding the blade edges of the two disk blades, the blade edges of the two disk blades rotated in the direction of drawing the sheet material to be cut, and A blade rotation driving means for rotating the two disk blades by giving a difference of 5% to 30% to the peripheral speed of the blade edge is provided , and the blade edge life is improved by self-dressing of the blade edge. To do.
[0005]
That is, the sheet material cutting device of the present invention employs a two-disc blade cutter moving sheet material cutting device having the advantage of not requiring the long straight fixed blade. The cutting edges of the two disk blades whose blade edges are pressed against each other by the pressure contact means are rotated in the direction of drawing the sheet material to be cut at the time of cutting by the rotation driving means, so that the cutting is reliably performed. Furthermore, since a difference is given to the peripheral speeds of the two disk blade edges that are rotationally driven, when the two blade edges rotate while being pressed against each other, slipping occurs on both edges and a self-dressing effect is produced, The blade edge is sharpened each time the carriage is reciprocated, and the cutting edge of the cutting apparatus is increased by always maintaining the sharpness of the blade edge. As a result, a sheet material cutting device having a long cutting life can be obtained even when an inexpensive blade material having low hardness and good workability is used.
[0006]
The difference between the peripheral speeds of the upper and lower disk blades is set to 5% to 30% . If the difference in peripheral speed is 5% or less, the above self-dressing effect is insufficient, and if it is 30% or more, the rotational load of the disc blade becomes too large and the rotation stops, causing problems in cutting. the speed difference is above 5% to 30% is good. Thus, by providing a circumferential speed difference between the upper and lower disk blades and making the circumferential speed of the disk blade larger than the moving speed of the carriage, the force in the direction of drawing the sheet material to be cut works, and further the sheet material to be cut Stable cutting is possible by cutting while pressing against the paper passing surface of the guide rail.
[0007]
The blade rotation driving means is simply composed of two rotating members whose outer periphery is in contact with the front and back surfaces of the guide rail and rotates in accordance with the movement of the carriage to rotate the two disk blades. This is desirable because the disk blade can be driven to rotate. In this case, in order to provide a difference in the peripheral speed between the two disk blades, the rotational speeds of the two rotating members may be the same, and the diameters of the two disk blades may be changed, or the friction drive or You may make it change the rotation speed of two disk blades of the same diameter by gear drive etc.
[0008]
Further, if the two rotating members are composed of two rotating bodies having different diameters fixed to the shafts of the two disk blades, the rotating body contacts the guide rail and rotates. Since the rotational speeds of the two disk blades fixed coaxially are different, the difference in the peripheral speed between the two disk blades can be easily provided.
[0009]
Further, if the two disk blades are press-contacted with a toe-in angle, the surface where the disk blades meet is reduced, the self-dressing effect is increased, and the load of the rotational driving force of the disk blades is reduced. It is easy to secure a pressure contact force that opposes the cutting reaction force, and the cutting can be performed smoothly. To achieve this effect, the preferred toe-in angle is O.D. It is 2 to 3.0 degrees.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. 1 is a perspective view of a carriage according to an embodiment of a sheet material cutting device of the present invention, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is a diagram showing a toe-in angle of a disc blade, and FIG. It is a figure explaining the self dressing condition of the disk blade edge at the time.
[0011]
In these drawings, the guide rail 2 has a substantially U-shaped hollow cross-sectional shape and is fixed to a frame (not shown) orthogonal to the traveling direction of the sheet material. The upper surface of the upper surface plate 3 forming a part of the side of the U-shaped cross section of the guide rail 2 forms a sheet passing surface of the sheet material to be cut, and the cutting operation can be performed only by placing the sheet material to be cut on the upper surface of the upper surface plate 3. It is a free set structure. The carriage 4 is composed of an upper tool rest 6 and a lower tool rest 7 provided with a guide portion 5. The upper tool rest 6 and the lower tool rest 7 allow a sheet to be cut to pass between the lower surface of the former and the upper surface of the latter. The gap 4a is formed and connected integrally by the connecting portion 6a at the tail end. The guide portion 5 of the lower tool post 7 slides on the inner surface of the U-shaped cross section of the guide rail 2 to move the carriage 4. A spiral hole 5a that is screwed into a spiral guide path 1a provided on the outer periphery of the shaft body 1 is provided in a substantially central portion of the guide portion 5 so that the shaft body 1 is rotationally driven by a driving unit (not shown). Thus, the carriage 4 is driven to move along the guide rail 2.
[0012]
As shown in FIG. 3, the upper disc blade 9 and the lower disc blade 10 are slightly inclined with respect to each other so that a toe-in angle θ is given, and the circumferential blade edges are brought into contact with each other. And 10a are rotatably supported by the upper tool post 6 and the lower tool post 7. The toe-in angle θ is desirably 0.2 to 3.0 degrees in order to secure a pressing force that opposes the cutting reaction force and to provide a self-dressing effect of the cutting edge described later. Further, the upper disk blade 9 is urged so as to come into pressure contact with the lower disk blade 10 by a coil spring 9b. Thereby, the contact 22 of the blade edge | tip of both disc blades is a cutting | disconnection point of a sheet | seat material.
[0013]
Rollers (rotating members) 14 and 15 are fixed to the upper disc blade 9 and the lower disc blade 10 as shown in FIG. Elastic rings 14 a and 15 a are fitted on the outer circumferences of the rollers (rotating members) 14 and 15. When the carriage 4 travels, the elastic rings 14 a and 15 a are in contact with the front and back surfaces of the upper surface plate 3 of the guide rail 2. The upper and

lower disk blades

9 and 10 are rotated in the direction in which the cutting edges of the upper disk blade 9 and the lower disk blade 10 draw the sheet material to be cut, thereby constituting the blade rotation driving means. Further, the outer diameter of the elastic ring 14 a of the upper disk blade 9 is made 5% to 30% larger than the outer diameter of the elastic ring 15 a of the lower disk blade 10. Thereby, the rotation speed of the lower disk blade 10 becomes larger than the rotation speed of the upper disk blade 9, and the circumferential speed of the lower disk blade 10 becomes larger than the circumferential speed of the upper disk blade 9, and between the cutting edges. Slip occurs. This produces a self-dressing effect where the cutting edges are polished together as shown by the hatched lines in FIG. Therefore, both the cutting edges of the upper and

lower disk blades

9 and 10 are always sharpened to perform cutting, so that the cutting life can be increased even if an inexpensive blade material with low hardness is used. Further, since the peripheral speed of the upper and lower disk blades is larger than the moving speed of the carriage, the sheet material to be cut is cut while the force drawn at the meshing point of the blade edge acts, and the cutting becomes smooth. As will be described later, the self-dressing effect is reduced whether the outer diameter difference is larger or smaller than 5% to 30%.
[0014]
【Example】
Roller in which the outer diameter of the elastic ring is changed by using a 13 mmφ disc blade having the same diameter as the upper and lower diameters formed by punching a hardened steel strip having a hardness of HRc51 and a thickness of 0.2 mm in the sheet material cutting device having the above configuration. Using the (rotating member), the cutting test was performed such that the difference in peripheral speed between the upper and lower disk blades was 0 to 40%. The results are shown in Table 1.
[0015]
[Table 1]

[0016]
The following can be seen from the results of the table. That is, sample no. When the peripheral speeds of the upper and lower disk blades 1 were the same (peripheral speed difference: 0), the cutting life was 20,000 to 30,000 times. Sample No. with a peripheral speed difference of 10 to 20% was used. 1, No. 1 In No. 2, the cutting life was extended to 40,000 to 50,000 times. From this result, it was found that by rotating the disc blade while giving a difference in the peripheral speed of the cutting edge, the cutting edge slips, self-dressing is performed, the cutting edge is sharpened, and the cutting life is improved. However, when the peripheral speed difference was set to 40%, the friction between the cutting edges increased on the contrary, and the disk blade sometimes did not rotate smoothly, and the exact life could not be measured. From these results, it was found that the peripheral speed difference of the disc blade for achieving the self-dressing effect is preferably 5 to 30%.
[0017]
As described above, according to the sheet material cutting device of the configuration of the present invention, in the blade moving type sheet material cutting device having two disc blades with less restriction on the cutting width of the sheet material to be cut, the pressure-sliding 2 Since the cutting is performed while the cutting edge of the disk blade is rotated in the direction in which the sheet material to be cut is drawn, the cutting can be reliably performed. Further, since there is a difference in the peripheral speed between the two rotating disc blade edges, the two blade edges slip during the rotation and are polished together, and a self-dressing effect is produced on the blade edges, so that the sharpness of the cutting edges is always maintained. Is preserved. As a result, a sheet material cutting device having a long cutting life with an inexpensive blade material having low hardness can be obtained.
[0018]
In order to give the above self-dressing effect and perform smooth cutting, the difference in peripheral speed between the two blade edges is preferably 5% to 30%. Although the peripheral speed of the lower disk blade is increased in this embodiment, the same stable cutting effect can be obtained even if the peripheral speed of the upper disk blade is increased.
[0019]
Further, since the two disk blades are pressed with a toe-in angle, the area of the contact portion of the cutting edge is reduced, the rotational load is reduced, the self-dressing effect is increased, and the pressing force against the cutting reaction force can be secured. It becomes easy and cutting can be done smoothly. To achieve this effect, the preferred toe-in angle is O.D. It is 2 to 3.0 degrees.
[0020]
In this embodiment, a method of moving and driving by a shaft having a spiral guide path is adopted as a carriage moving method that is advantageous for downsizing, but other wires connected to the carriage are pulled by a pulley or a toothed belt is used. It is possible to adopt the present invention not only in the blade movement type sheet material cutting apparatus that is driven by the above and moves the carriage.
[0021]
In addition, a roller (rotating member) having a different diameter difference fixed to the disk blade shaft is used as the blade rotation driving means. However, the roller is provided separately from the disk blade shaft, or a gear or You may change the rotation speed of two disk blades with a friction wheel.
[0022]
【The invention's effect】
As described above, according to the sheet material cutting device of the present invention, the sharpness of the blade edge can be kept long because a self-dressing effect is given to the blade edge of the disk blade every time the carriage moves during cutting. Increase the service life. Thereby, since a cutting device having a long life can be obtained even with an inexpensive blade material having good workability, the cost of the cutting device can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of a carriage of a sheet material cutting device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is a diagram showing a toe-in angle of a disc blade of the sheet material cutting device according to the embodiment of the present invention.
FIG. 4 is a diagram for explaining a self-dressing state of a blade edge due to rotation of a disk blade.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft body 2 Guide rail 3 Upper surface board 4 Carriage 5 Guide part 6 Upper tool post 7 Lower tool post 9 Upper disc blade 9a Upper disc blade shaft 9b Coil spring (pressure contact means)
10 Lower disc blade 10a Lower disc blade shaft 14 Upper roller (rotating member)
14a Elastic ring 15 Lower roller (rotating member)
15a Elastic ring 22 Intersection (cutting point)

Claims

In the sheet material cutting apparatus for reciprocating a carriage having two disk blades on a guide rail that is passed in the cutting width direction and cutting the sheet material with the blade edges that meet each other, the two disk blades A pressure-contacting means for pressure-sliding the blade edge, and rotating the blade edges of the two disc blades in the direction of drawing the sheet material to be cut, and giving a difference of 5% to 30% to the peripheral speed between the blade edges. A sheet material cutting apparatus comprising: a blade rotation driving means for rotating the two disk blades to improve the blade edge life by self-dressing the blade edge .

The blade rotation driving means is composed of two rotating members whose outer periphery is in contact with the front and back surfaces of the guide rail and rotates in accordance with the movement of the carriage to respectively rotate the two disk blades. The sheet material cutting device according to claim 1.

The sheet material cutting device according to claim 2, wherein the two rotating members are configured by two rotating bodies having different diameters fixed to shafts of the two disk blades.

The sheet material cutting device according to any one of claims 1 to 3, wherein the two disk blades are press-contacted with a toe-in angle.