JP4149738B2 - Sheet corner cutting device - Google Patents

Description

【００２３】
表１は、従来技術で説明した上刃と、本発明の上刃２１との実験結果である。実験では、それぞれの上刃で切断した時の切屑の飛散方向を調べた。表１の数値は、予め所定の範囲を設定し、その所定範囲外に飛散した切屑の数である。したがって、その数値が少ないほど飛散方向が安定していることを示す。実験回数は、各吸引圧のもとで、それぞれ１０００回行った。
【００２４】
この結果からわかるように、従来例では、吸引圧が−２５０（ｍｍＡｑ）のときには、１０００回のうち、３２５回、切屑が所定範囲外に飛散しており、吸引圧を上げていくにしたがってその回数は減少していくものの、吸引圧が−１０００（ｍｍＡｑ）のときでも、１０００回のうち１２回所定範囲外に飛散している。これに対して、本発明では、いずれの吸引圧においても、１００％の確率で所定範囲内に飛散している。この結果から、従来例と比較して本発明の方が切屑の飛散方向が安定していことがわかる。
【００２５】
以下、上記構成の作用について説明する。ウエブ１１ａは、フイルムロール１１からシート１２サイズに応じた量だけ引き出された後停止する。第１カッタ１４によって、シート１２に切断されるとともに、その後端がラウンド加工される。
【００２６】
次に、第２カッタ１６の上刃２１が下降してシート１２の前端の各コーナー１２ａ，１２ｂを切断する。この切断時には、まず、上刃２１の刃先５３の両端がシート１２と接触し、上刃２１が下降していくにしたがって、２つの切断開始点Ｐｓからその間の切断終了点Ｐｅに向かって剪断されていく。切断終了点Ｐｅに達すると、切屑３０がシート１２から切り離される。２つの剪断方向ｄｓは互いに向き合っているので、２つの剪断速度ベクトルが互いに打ち消し合い、切断終了時に切屑３０に発生する回転モーメントが最小に抑えられる。これにより、切屑３０の飛散方向が安定する。
【００２７】
また、切断と同時に、吸引装置２７が作動して、切屑３０を吸引する。この吸引によって、隔壁４１，４２の各通風口４３から空気がそれぞれ吸引口３７，３８に向かって流れる。この空気の流れに従って各切屑３０がそれぞれ吸引口３７，３８に吸い込まれる。さらに、上刃２１のエア吹きつけ穴４４を介して切屑３０にエアが吹き付けられる。これらにより、切屑３０が吸引口３７，３８に引きつけられて、確実に回収される。
【００２８】
上記実施形態では、シートを停止させた状態で切断するカッタを例に説明しているが、シートを搬送させながら切断を行うロータリーオシュレート（rotary-oscilate ）方式のカッタでもよい。ロータリーオシュレート方式は、図５に示すように、シート８２の搬送に同期して、上刃８１及び下刃８２がそれぞれ変位する。上刃８１は、旋回し、他方、下刃８２は、シート８２の搬送方向に沿って左右に揺動する。図５において、上刃８１及び下刃８２の近傍にある丸数字は、各刃８１，８２が１回の切断を行うときの変位の順番を示す。図５において、▲１▼が各刃８１，８２の初期位置であり、▲２▼，▲３▼，▲４▼，▲５▼と順番に変位した後再び初期位置に復帰する。
【００２９】
上刃８１は、図５（Ａ）に示すように、初期位置から時計方向に旋回しながら下刃８２に向かって下降する。図５（Ｂ）に示す▲３▼の切断開始位置に向かう。他方、下刃８２は、初期位置からいったん右方向に移動した後、下降してくる上刃８１に向かって左方向に移動する。そして、▲３▼の位置で切断が開始される。▲４▼の位置で切断を終了した後、上刃８１は、再び旋回しながら初期位置に向かって上昇する。他方、下刃８２は、いったんシート８３とともに左方向に移動した後、右方向へ移動して初期位置に復帰する。各刃８１，８２の変位速度は、シート８３の搬送速度に応じて決定される。このロータリーオシュレート方式によれば、シートを停止させることなく切断を行うことができるので、生産効率を向上させることができる。
【００３０】
上記実施形態では、上刃の刃先をＶ字形とし、その２つの斜辺の剪断角が等しい例で説明したが、異なってもよい。また、Ｖ字形の例で説明したが、例えば、緩やかな円弧形状など、Ｖ字形以外でもよい。また、シートとして、Ｘ線フイルムを使用した例で説明しているが、Ｘ線フイルム以外でも各種写真フイルム、その他シート形状の各種のものに適用することができる。
【００３１】
【発明の効果】
以上詳細に説明したように、本発明は、第１刃と、この第１刃と対向する位置から第１刃に向かって変位する第２刃とを有し、これら第１刃と第２刃とでシートを挟み込んでそのコーナーを切断するシートのコーナーカット装置において、前記第２刃の刃先に、第１刃の刃先に対して凹になるように剪断角を付けることにより、前記コーナーを切断する際の剪断方向が、前記第２刃の刃先の両端からその中央付近に向かうようにしたから、切断した切屑の飛散方向が安定し、切屑を確実に回収できる。
【図面の簡単な説明】
【図１】カット装置の構成図である。
【図２】シートのカット手順の説明図である。
【図３】上刃の説明図である。
【図４】剪断方向の説明図である。
【図５】ロータリーオシュレート方式のカッタの説明図である。
【図６】従来の刃の剪断方向の説明図である。
【符号の説明】
１０ カット装置
１２ シート
１４ 第１カッタ
１６ 第２カッタ
１９ 下刃
２１ 上刃
２７ 吸引装置
５３ 刃先[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet corner cutting apparatus for cutting a corner of a sheet.
[0002]
[Prior art]
For example, as described in Japanese Patent Application Laid-Open No. 5-16099, a sheet corner cutting device (hereinafter referred to as a cutting device) for cutting a corner of a sheet is known. This cutting device includes a cutter composed of an upper blade (second blade) and a lower blade (first blade), and lowers the upper blade toward the fixed lower blade and sandwiches the sheet with the upper and lower blades. A shearing type cutter that cuts by cutting is used.
[0003]
As shown in FIG. 6, in the shearing type cutter, the cutting edge 62 of the upper blade 61 has a shear angle SA. In this case, when the upper blade 61 is lowered toward the lower blade (dm direction), the sheet 12 and the blade edge 62 first contact each other at the cutting start point Ps to start cutting, and when further lowered, shearing occurs. By being sheared along the direction ds, the contact point reaches the cutting completion point Pe and the cutting is finished.
[0004]
In the case where the sheet 12 is a film such as a photographic film or an X-ray film, if the cut chips are scattered on the sheet, it becomes a defective product. Therefore, in the said cutting device, in order to prevent scattering of a chip, the chip collection apparatus which attracts | sucks and collects a chip with a suction tube is provided. Thereby, scattering of chips is prevented.
[0005]
[Problems to be solved by the invention]
However, when the upper blade having the shear angle as described above is used, the shear direction ds becomes one direction. In order to round the corner, the cutting edge must be curved in accordance with the machining shape, so that a large rotational moment is generated in the chips at the cutting end point Pe. For this reason, since the direction in which the chips scatter is not determined at the end of cutting, it is difficult to scatter the chips toward the suction port arranged in advance, and the chips cannot be reliably collected.
[0006]
In order to solve the above-described problems, an object of the corner cutting device for a sheet of the present invention is to reliably collect cut chips.
[0007]
[Means for Solving the Problems]
In order to achieve the object, a sheet corner cutting device according to the present invention includes a first blade and a second blade that is displaced from a position facing the first blade toward the first blade. In a sheet corner cutting device that sandwiches a sheet between one blade and a second blade and cuts the corner, a shear angle is given to the blade edge of the second blade so as to be concave with respect to the blade edge of the first blade. Thus, the shearing direction when cutting the corner is directed from both ends of the cutting edge of the second blade toward the center thereof.
[0008]
The cutting edge of the second blade may be V-shaped, and the shear angles of the two hypotenuses may be substantially equal. Furthermore, it is preferable to provide a chip collection means for sucking and collecting the cut chips.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In the cutting apparatus 10 shown in FIG. 1, an X-ray film roll 11 slit in the width of the product is set. The cutting device 10 pulls out the leading end of the web 11a from the film roll 11, cuts it into a sheet 12 having a predetermined size, and rounds each corner of the sheet 12. The cutting device 10 includes a first cutter 14 and a second cutter 16. First, as shown in FIG. 2, the web 11 a is cut into sheets 12 by the first cutter 14. Then, the corners 12 a and 12 b on the front end side of the cut sheet 12 are rounded by the second cutter 16. When this round processing is finished, the sheet 12 is sucked by the suction table 17 and conveyed downstream so as to straddle the second cutter 16.
[0010]
The first and second cutters 14 and 16 include lower blades 18 and 19 that are fixed blades, and upper blades 20 and 21 that descend toward the lower blades 18 and 19 when cutting, respectively. The web 11a or the sheet 12 is sandwiched between the lower blades 18 and 19 and the lower blades 18 and 19 and cut.
[0011]
The upper blade 20 and the lower blade 18 of the first cutter 14 have cutting edges extending along the width direction of the sheet 12 in order to separate the sheet 12 from the web 11a. Further, at the same time as the separation, in order to round each corner 12c, 12d on the rear end side of the sheet 12, both ends thereof are curved in accordance with the processing shape.
[0012]
The upper blade 20 is mounted so as to be movable in the vertical direction. The upper blade 20 is moved downward from the initial position toward the lower blade 18 when the web 11a is set between the upper blade 20 and the lower blade 18. Then, it moves between the lower blade 18 and the cutting position where the web 11a is sandwiched and cut. This movement is performed by the cutter moving mechanism 24.
[0013]
Since the 2nd cutter 16 processes each corner 12a, 12b of the front end side of the sheet | seat 12 already cut | disconnected, each edge part 21a, 21b of the upper blade 21 and each edge part of the lower blade 19 which opposes these are carried out. Only the cutting edges are provided, and their positions correspond to the corners 12a and 12b. The cutting edges of the upper blade 21 and the lower blade 19 are curved in accordance with the machining shape.
[0014]
Similarly to the upper blade 20 of the first cutter 16, the upper blade 21 is attached so as to be movable in the vertical direction, and moves between the initial position and the cutting position. This movement is also performed by the cutter moving mechanism 24.
[0015]
The suction device 27 collects the chips 30 cut by the second cutter 16. The suction device 27 includes suction pipes 28 and 29 and a pump (not shown). Nozzles 31 and 32 are attached to the distal ends of the suction pipes 28 and 29, respectively. The nozzles 31 and 32 are formed with suction ports 37 and 38 that match the shape of the chips 30. The suction ports 37 and 38 are arranged in accordance with the positions of the corners 12a and 12b. The suction device 27 operates in accordance with the cutting timing, and sucks and collects the chips 30 from the suction ports 37 and 38.
[0016]
On the side surfaces of the nozzles 31 and 32, partition walls 41 and 42 for preventing the chips 30 from scattering outside the suction ports 37 and 38 are attached. Ventilation openings 43 are formed in the partition walls 41 and 42. The ventilation port 43 is for allowing the air around the chip 30 to flow toward the suction ports 37 and 38 when sucked by the suction device 27. As a result, the chips 30 are more reliably collected in the suction pipes 28 and 29.
[0017]
An air blowing hole 44 is formed in the upper blade 21. In accordance with the timing of cutting, air is blown from the air blowing holes 44 toward the chips 30. Thereby, the chips 30 are prevented from scattering on the sheet 12.
[0018]
Reference numeral 51 denotes a notch cutter that forms a notch in the sheet 12 for identifying the sheet type, product number, production lot, and the like. The notch cutter 51 is detachably attached to the upper blade 21. With the notch cutter 51, the corners 12a and 12b are rounded, and at the same time, the sheet 12 is notched.
[0019]
The notch cutter 51 can be changed in its mounting position so that the notch position can be changed for each product number or lot. Depending on the mounting position of the notch cutter 51, the lower blade 19 is formed with grooves at a plurality of positions. Further, the notch waste is collected from the suction pipe 29. Therefore, the nozzle 32 has an opening for collecting the notch waste.
[0020]
FIG. 3A is a view of the upper blade 21 as viewed from below. As shown in the AA sectional view of FIG. 3B, the blade edge 53 of the upper blade 21 is recessed in a V shape with respect to the lower blade 19 having a blade edge parallel to the sheet surface. As shown in FIG. 4A when the upper blade 21 is viewed from the B direction, the two hypotenuses constituting the blade edge 53 have equal shear angles SA. The shear angle SA is about 5 °. Of course, the shear angle SA does not have to be 5 °, and is determined appropriately in consideration of the thickness, material, processed shape, and the like of the sheet 12.
[0021]
If it carries out like this, both ends of the blade edge | tip 53 will become the cutting start point Ps, and the center will become the cutting completion point Pe. That is, when the upper blade 21 is lowered along the moving direction dm to cut the corners 12a and 12b, the shearing direction ds from the two cutting start points Ps is directed toward the center of the blade edge 53, respectively. Therefore, the shear rate vectors cancel each other, and the scattering direction of the chips 30 at the end of cutting is stabilized.
[0022]
[Table 1]

[0023]
Table 1 shows experimental results of the upper blade described in the prior art and the upper blade 21 of the present invention. In the experiment, the scattering direction of chips when cut with each upper blade was examined. The numerical values in Table 1 are the number of chips set in a predetermined range in advance and scattered outside the predetermined range. Therefore, the smaller the value, the more stable the scattering direction. The number of experiments was 1000 times under each suction pressure.
[0024]
As can be seen from this result, in the conventional example, when the suction pressure is −250 (mmAq), chips are scattered out of a predetermined range 325 times out of 1,000 times, and as the suction pressure is increased, Although the number of times decreases, even when the suction pressure is −1000 (mmAq), it is scattered out of the predetermined range 12 times out of 1000 times. On the other hand, in the present invention, any suction pressure is scattered within a predetermined range with a probability of 100%. From this result, it can be seen that the direction of the present invention is more stable in the direction of chip scattering than the conventional example.
[0025]
The operation of the above configuration will be described below. The web 11a is pulled out from the film roll 11 by an amount corresponding to the size of the sheet 12 and then stopped. The first cutter 14 cuts the sheet 12 and rounds the rear end thereof.
[0026]
Next, the upper blade 21 of the second cutter 16 descends and cuts the corners 12 a and 12 b at the front end of the sheet 12. At the time of this cutting, first, both ends of the blade edge 53 of the upper blade 21 come into contact with the sheet 12, and the upper blade 21 is sheared from the two cutting start points Ps toward the cutting end point Pe therebetween. To go. When the cutting end point Pe is reached, the chips 30 are separated from the sheet 12. Since the two shear directions ds face each other, the two shear rate vectors cancel each other, and the rotational moment generated in the chip 30 at the end of cutting is minimized. Thereby, the scattering direction of the chips 30 is stabilized.
[0027]
Simultaneously with the cutting, the suction device 27 operates to suck the chips 30. By this suction, air flows from the ventilation openings 43 of the partition walls 41 and 42 toward the suction openings 37 and 38, respectively. The chips 30 are sucked into the suction ports 37 and 38 in accordance with the air flow. Further, air is blown to the chips 30 through the air blowing holes 44 of the upper blade 21. As a result, the chips 30 are attracted to the suction ports 37 and 38 and are reliably recovered.
[0028]
In the above-described embodiment, the cutter that cuts the sheet while stopped is described as an example. However, a rotary-oscilate type cutter that performs cutting while conveying the sheet may be used. In the rotary oscillating method, as shown in FIG. 5, the upper blade 81 and the lower blade 82 are displaced in synchronization with the conveyance of the sheet 82. The upper blade 81 turns, while the lower blade 82 swings left and right along the conveying direction of the sheet 82. In FIG. 5, the circled numbers in the vicinity of the upper blade 81 and the lower blade 82 indicate the order of displacement when each of the blades 81 and 82 performs a single cut. In FIG. 5, (1) is the initial position of each of the blades 81 and 82, and after shifting in order (2), (3), (4), (5), it returns to the initial position again.
[0029]
As shown in FIG. 5A, the upper blade 81 descends toward the lower blade 82 while turning clockwise from the initial position. It heads for the cutting start position (3) shown in FIG. On the other hand, the lower blade 82 once moves rightward from the initial position, and then moves leftward toward the upper blade 81 descending. Then, cutting is started at the position {circle around (3)}. After completing the cutting at the position {circle around (4)}, the upper blade 81 moves upward toward the initial position while turning again. On the other hand, the lower blade 82 once moves in the left direction together with the sheet 83, then moves in the right direction and returns to the initial position. The displacement speed of each blade 81 and 82 is determined according to the conveyance speed of the sheet 83. According to this rotary oscillating method, cutting can be performed without stopping the sheet, so that production efficiency can be improved.
[0030]
In the above embodiment, the upper blade edge is V-shaped and the shear angles of the two hypotenuses are equal, but may be different. Further, although the example of the V shape has been described, the shape may be other than the V shape such as a gentle arc shape. Further, although an example in which an X-ray film is used as the sheet has been described, the present invention can be applied to various photographic films and various other sheet-shaped sheets other than the X-ray film.
[0031]
【The invention's effect】
As described above in detail, the present invention has the first blade and the second blade that is displaced from the position facing the first blade toward the first blade, and the first blade and the second blade. In a sheet corner cutting apparatus that sandwiches a sheet and cuts the corner, the corner of the second blade is cut by making a shear angle so as to be concave with respect to the blade edge of the first blade. Since the shearing direction at the time of making it goes to the center vicinity from the both ends of the said 2nd blade edge | tip, the scattered direction of the cut | disconnected chip | tip is stabilized and chip | tip can be collect | recovered reliably.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a cutting device.
FIG. 2 is an explanatory diagram of a sheet cutting procedure.
FIG. 3 is an explanatory diagram of an upper blade.
FIG. 4 is an explanatory diagram of a shear direction.
FIG. 5 is an explanatory diagram of a rotary oscillating type cutter.
FIG. 6 is an explanatory diagram of a shearing direction of a conventional blade.
[Explanation of symbols]
10 Cutting device 12 Sheet 14 First cutter 16 Second cutter 19 Lower blade 21 Upper blade 27 Suction device 53 Cutting edge

Claims (5)

The cutter has a first blade and a second blade that is displaced from the position facing the first blade toward the first blade. The sheet is sandwiched between the first blade and the second blade, and the corner is defined. In the corner cutting device for the sheet to be cut,
The shearing direction when cutting the corner is so that the cutting edge of the second blade is concave with respect to the cutting edge of the first blade so as to go from both ends of the cutting edge of the second blade to the vicinity of the center thereof. Horns are formed,
Furthermore, a partition for preventing scattering of chips generated at the time of cutting disposed on the side of the cutter, and a suction device for collecting the chips generated at the time of cutting by suction, are provided.
A sheet corner-cutting device, wherein the partition wall is formed with a vent hole for flowing air toward the suction port of the suction device.   Furthermore, an air blowing hole for blowing air to chips generated during cutting is formed in the upper blade disposed above the sheet among the first blade and the second blade. The sheet corner cutting device according to claim 1.   The sheet corner cutting device according to claim 1, wherein the suction operation of the suction device or the blowing of the air is performed in accordance with a cutting timing.   The sheet cutting device according to any one of claims 1 to 3, wherein a cutting edge of the second blade is V-shaped, and shear angles of the two hypotenuses are substantially equal.   The cutter approaches the first blade while the first blade reciprocates along the conveyance direction and the second blade rotates in a plane perpendicular to the conveyance direction in synchronization with the conveyance of the sheet. The sheet corner cutting device according to any one of claims 1 to 4, wherein the sheet is a rotary oscillating method.

Images