JP4625209B2

JP4625209B2 - Tape take-up shaft

Info

Publication number: JP4625209B2
Application number: JP2001240551A
Authority: JP
Inventors: 勝義木下
Original assignee: ニューマチック工業株式会社
Priority date: 2001-08-08
Filing date: 2001-08-08
Publication date: 2011-02-02
Anticipated expiration: 2021-08-08
Also published as: JP2003054844A

Description

【０００１】
【発明の属する技術分野】
本発明は、テープ、帯状フィルム、帯状シート等の原反材（以下、テープと呼ぶ）を巻き取る際に心棒として用い、テープ巻取り後は巻取テープから抜き出し得るようにしたテープ巻取シャフトに関する。
【０００２】
【従来の技術】
図５はリーフタイプと称されるテープ巻取シャフト（エアーシャフト）１上にテープ２を巻き取り始める時の状態を示す垂直断面略図で、テープ巻取シャフト１はドラム３と、４個の移動リーフ４と、移動リーフ４を図示の最大径Ｄ１まで拡開するためにドラム３内に配置された膨張体５とを備え、移動リーフ４と一体のラグ４ａはドラム３に開けた細長い（紙面と直角方向に細長い）貫通孔６を通してラグ受け４ｂに固着されている。膨張体５内には加圧エアーが供給されているためラグ受け４ｂがドラム３の内面に衝合するまで半径方向外方へ移動しており、移動リーフ４は図示されていない戻しばね機構の弾力に抗して外方へ張りだし、隣接リーフ４、４間に例えば１０ｍｍの隙間７ができている。テープ巻取シャフト１は例えば直径３００ｍｍの駆動ロール８、９の上に載せられ、ロール起動前にロール８の下側から人手によりテープ巻取シャフト１の外周に巻かれたテープ２の先端のタック（折返し部）をロール９の上側からロール８とテープ巻取シャフト１の間に噛み込ませてから、両ロール８、９を矢印方向に回転させる。巻取テープが２ａのような所定サイズに達すると駆動ロール８、９を止め、巻き終わりのテープ２を切断し、膨張体５内の加圧エアーを抜き、シャフト１を最小径Ｄ２まで縮径させて、巻取テープ２ａから抜き取る。先行技術としては、本件出願人の実公平５−３７９７７号がある。
【０００３】
ところがテープ巻取り時に最大径Ｄ１まで拡径されることに起因して、隣接リーフ４、４間に隙間７の発生が避けられず、この隙間７があるために巻取テープ２ａの巻始め部分のテープ２に跡形が付き、この傾向はシャフト１の外周面に近い程顕著になり、巻かれた商品（テープ）の品質低下を来す。又、駆動ロール８、９上を隙間７部分が通過する際にバウンドが生じ、これによりテープ２に不均一なテンションが掛かり、テープの品質がばらつき易く、巻取テープのシャフトと直角な端面が面位置に揃わないことによる巻き姿の低下が生じ、特に多条取り時に別れなくなる恐れもある。テープに皺が入る場合もあり、５０〜１００ｒ．ｐ．ｍ．ではさほど問題はないが、２００〜３００ｒ．ｐ．ｍ．での操業は殆ど不可能になる。
【０００４】
【発明が解決しようとする課題】
テープ巻取り時に、リーフタイプのテープ巻取シャフトの外周に出来る隙間７によりテープへ跡形が生じたり、バウンドにより巻取り速度を高められない不具合を回避し得るように改善することを目的としている。
【０００５】
【課題を解決するための手段】
請求項１の発明は、ドラムと、ドラムに対してその外側で固定又は可動の第１リーフ及び可動の第２リーフと、リーフを拡開するためにドラム内に配置された膨張体とを備え、膨張体の膨張時に第１リーフと第２リーフが協働して外周に隙間のない大径シャフトを形成するようにしており、１個の第１リーフと、第１リーフに隣接する１対の第２リーフとを備え、第２リーフが第１リーフと反対側でドラム内面と衝合する支点を形成し、第２リーフが支点を中心に回動しながら拡開する時に支点と反対側の端部が衝合する斜面を第１リーフ端部に設けた、ことを特徴とする、テープ巻取シャフトである。
【０００８】
【発明の実施の形態】
請求項１の実施例を示す図１、図２において、図１は縮小時、図２は拡大時である。図１の第１リーフ１４はラグ１４ａを介してラグ受け１４ｂに締着され、実線の実施例ではドラム３と一体化している。しかし、ラグ受け１４ｂにドラム３の内面に沿う盗み部１６（半径方向厚さ：Ｌ３）を設けておくことにより、膨張体５が膨張した時にＬ３だけ半径方向外方へ張出し可能とすることもできる。第１リーフ１４は円周方向両端部に、第２リーフ１７、１７のラグ１７ａの中心線Ｏ１、Ｏ２と略平行な斜面１８、１９を備えている。
【０００９】
第２リーフ１７はラグ１７ａを介してラグ受け１７ｂに締着されているが、ラグ１７ａはそれよりもシャフト円周方向幅の大きい貫通孔２０の中央を通り、従って、円周方向両側にがたＬ４が残されている。ラグ受け１７ｂはラグ１４ａから最も遠い外周部の点Ｐ１においてドラム３の内面に衝合又は僅かな隙間を隔てて対向し、そこからラグ１４ａ側へ行くに連れてドラム内面から離れ、最大のがたはＬ５となっている。第２リーフ１７の内面はラグ１７ａ近傍の円周方向中央部でドラム３の外面に接しているが、そこから離れるに連れてがたＬ６までドラム３の外面から離れている。又、第２リーフ１７、１７の第１リーフ１４から最も離れた両端部は僅かながたＬ７を隔てて対向し、更に、第１リーフ１４側の端部の斜面２１、２２は斜面１８、１９に対してシャフト中心側へゆくに連れて離れるように傾き、第１リーフ１４の外面に対してがたＬ８だけ中心側の位置を占めている。
【００１０】
膨張体５の内部に加圧エアーを供給すると、膨張体５の外面がラグ受け１７ｂを半径方向外方へ押し、点Ｐ１がドラム３の内面に衝合し、そこが支点となって第２リーフ１７のユニットはＸ１，Ｘ２方向に回動し、図２のように、図１のがたＬ７が０又は略０になり、同時に斜面２１、２２が斜面１８、１９に衝合して円周方向の隙間（がたＬ１２）は０となり、がたＬ８も０又は略０になり、従って円周方向の隙間のない円滑な円筒面を有する大径シャフト１１が得られる。
【００１１】
参考例を示す図３、図４において、図３は縮小時、図４は拡大時である。図３において、第１リーフ１４とドラム３の間及びドラム３とラグ受け１４ｂの間には夫々がたＬ９、Ｌ１０が設けてあり、第１リーフ１４の両端部の斜面１８、１９は第２リーフ２５のラグ２５ａの中心線Ｏ３に対して半径方向外方へゆくに連れて接近するように傾斜している。第２リーフ２５の斜面２６、２７は斜面１８、１９と平行である。ラグ受け２５ｂとドラム３の内面との間には大きいがたＬ１１が設けてある。
【００１２】
膨張体５内に加圧エアーを供給すると、図４のように膨張体５の外面がラグ受け１４ｂ、２５ｂを半径方向外方へ押圧し、がたＬ１０、Ｌ１１が０になった時、斜面２６、２７が斜面１８、１９の半径方向外方端部と衝合して、外周に隙間のない完全な円形に仕上がる。
【００１３】
なお、拡大時の図２における円周方向の隙間に相当するがたＬ７、Ｌ１２は、０が好ましいが、無視し得る程度のテープ上の跡形やバウンドを生ずる、０に極めて近い値であっても差支えない。又、図１のがた１６を設けると、最小径を減すことができ、シャフトの抜取りが容易になる。
【００１４】
【発明の効果】
請求項１の発明によると、リーフタイプであっても、巻き取られるテープに跡形を生ずる恐れがなくなり、かつバウンドの発生も効果的に回避できるため、巻取り速度を増して能率を向上させ得る利点が生ずる。拡大途中において第２リーフ１７（図１）がＸ１、Ｘ２方向に回動するので、円周上の隙間を確実に０にすることが容易である。
【図面の簡単な説明】
【図１】本発明によるテープ巻取シャフトの縮小時の断面図である。
【図２】図１のテープ巻取シャフトの拡大時の断面図である。
【図３】参考例における縮小時の断面図である。
【図４】図３のテープ巻取シャフトの拡大時の断面図である。
【図５】従来構造における垂直断面略図である。
【符号の説明】
３ドラム
５膨張体
７隙間
１１シャフト
１４第１リーフ
１７第２リーフ
１８、１９斜面
２５第２リーフ
Ｐ１点（支点）[0001]
BACKGROUND OF THE INVENTION
The present invention is a tape take-up shaft that is used as a mandrel when a raw material (hereinafter referred to as a tape) such as a tape, a belt-like film, or a belt-like sheet is taken up, and can be extracted from the take-up tape after winding the tape. About.
[0002]
[Prior art]
FIG. 5 is a schematic vertical sectional view showing a state in which the tape 2 is started to be wound on a tape winding shaft (air shaft) 1 called a leaf type. The tape winding shaft 1 has a drum 3 and four movements. A leaf 4 and an expansion body 5 disposed in the drum 3 to expand the movable leaf 4 to the maximum diameter D1 shown in the figure are provided, and a lug 4a integrated with the movable leaf 4 is an elongated (paper surface). And is fixed to the lug receiver 4b through the through hole 6. Since pressurized air is supplied into the expansion body 5, the lug receiver 4 b moves radially outward until it abuts against the inner surface of the drum 3, and the moving leaf 4 is a return spring mechanism (not shown). It protrudes outward against the elasticity, and a gap 7 of, for example, 10 mm is formed between adjacent leaves 4 and 4. The tape take-up shaft 1 is placed on the drive rolls 8 and 9 having a diameter of 300 mm, for example, and is tucked at the tip of the tape 2 that is manually wound around the outer circumference of the tape take-up shaft 1 from the lower side of the roll 8 before starting the roll. After the (turn-back portion) is bitten between the roll 8 and the tape take-up shaft 1 from above the roll 9, both rolls 8 and 9 are rotated in the direction of the arrow. When the winding tape reaches a predetermined size such as 2a, the drive rolls 8 and 9 are stopped, the tape 2 at the end of winding is cut, the pressurized air in the expansion body 5 is discharged, and the shaft 1 is reduced in diameter to the minimum diameter D2. And take it out of the winding tape 2a. As the prior art, there is Japanese Utility Model No. 5-37977 of the present applicant.
[0003]
However, due to the diameter being increased to the maximum diameter D1 at the time of winding the tape, the generation of the gap 7 between the adjacent leaves 4 and 4 cannot be avoided. The trace is attached to the tape 2, and this tendency becomes more prominent the closer to the outer peripheral surface of the shaft 1, the lower the quality of the wound product (tape). In addition, bounce occurs when the gap 7 portion passes over the drive rolls 8 and 9, which causes non-uniform tension to be applied to the tape 2, and the quality of the tape tends to vary, and the end face perpendicular to the shaft of the winding tape is There is a possibility that the winding shape will be deteriorated due to inconsistency in the surface position, and it may not be separated especially when multiple strips are taken. In some cases, wrinkles may enter the tape. p. m. Then there is not much problem, but 200-300 r. p. m. Operation at is almost impossible.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to improve the tape winding so as to avoid a defect in which a trace is generated on the tape due to the gap 7 formed on the outer periphery of the leaf type tape winding shaft or the winding speed cannot be increased by bouncing.
[0005]
[Means for Solving the Problems]
The invention of claim 1 includes a drum, a first leaf and a second leaf that are fixed or movable on the outside of the drum, and an expansion body disposed in the drum to expand the leaf. The first leaf and the second leaf cooperate to form a large-diameter shaft without a gap on the outer periphery when the expansion body is inflated , and one pair of the first leaf and the first leaf are adjacent to each other. The second leaf forms a fulcrum that abuts the drum inner surface on the side opposite to the first leaf, and the second leaf is on the side opposite to the fulcrum when the second leaf expands while rotating around the fulcrum. The tape take-up shaft is characterized in that the first leaf end is provided with a slope where the ends of the tape abut each other.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Figure 1 illustrates an embodiment of claim 1, 2, when 1 is reduced, FIG. 2 is a time expansion. The first leaf 14 in FIG. 1 is fastened to the lug receiver 14b via a lug 14a, and is integrated with the drum 3 in the solid line embodiment. However, by providing the lug receiver 14b with a stealing portion 16 (radial thickness: L3) along the inner surface of the drum 3, when the expandable body 5 expands, it may be possible to project only L3 outward in the radial direction. it can. The first leaf 14 includes slopes 18 and 19 that are substantially parallel to the center lines O1 and O2 of the lugs 17a of the second leaves 17 and 17 at both ends in the circumferential direction.
[0009]
The second leaf 17 is fastened to the lug receiver 17b via the lug 17a, but the lug 17a passes through the center of the through hole 20 having a larger shaft circumferential width than that, and therefore, the lug 17a is on both sides in the circumferential direction. L4 is left. The lug receiver 17b is opposed to the inner surface of the drum 3 at a point P1 of the outermost part farthest from the lug 14a with a slight gap, and away from the inner surface of the drum as it goes to the lug 14a side. Or L5. The inner surface of the second leaf 17 is in contact with the outer surface of the drum 3 at the center in the circumferential direction in the vicinity of the lug 17a, but is further away from the outer surface of the drum 3 up to L6 as it moves away from it. Further, both end portions of the second leaves 17 and 17 farthest from the first leaf 14 face each other with a slight gap L7, and the slopes 21 and 22 at the end on the first leaf 14 side are slopes 18 and 22, respectively. 19 is inclined away from the center of the shaft toward the shaft center side, and occupies the center side position by the backlash L8 with respect to the outer surface of the first leaf 14.
[0010]
When pressurized air is supplied to the inside of the expansion body 5, the outer surface of the expansion body 5 pushes the lug receiver 17b outward in the radial direction, and the point P1 collides with the inner surface of the drum 3, which becomes a fulcrum and serves as a second point. The unit of the leaf 17 rotates in the X1 and X2 directions, and as shown in FIG. 2, the backlash L7 in FIG. 1 becomes 0 or substantially 0, and at the same time, the slopes 21 and 22 collide with the slopes 18 and 19, respectively. The circumferential clearance (again L12) is 0, and the irregularity L8 is also 0 or substantially 0. Therefore, a large-diameter shaft 11 having a smooth cylindrical surface with no circumferential clearance is obtained.
[0011]
3 and 4 showing the reference examples , FIG. 3 is at the time of reduction and FIG. 4 is at the time of enlargement. In FIG. 3, L9 and L10 are provided between the first leaf 14 and the drum 3 and between the drum 3 and the lug receiver 14b, and the slopes 18 and 19 at both ends of the first leaf 14 are the second. The leaf 25 is inclined so as to approach the center line O3 of the lug 25a toward the outer side in the radial direction. The slopes 26 and 27 of the second leaf 25 are parallel to the slopes 18 and 19. A large plate L11 is provided between the lug receiver 25b and the inner surface of the drum 3.
[0012]
When pressurized air is supplied into the inflatable body 5, the outer surface of the inflatable body 5 presses the lug receivers 14b and 25b outward in the radial direction as shown in FIG. 26 and 27 collide with the radially outer ends of the slopes 18 and 19 to complete a perfect circle with no gaps on the outer periphery.
[0013]
Note that L7 and L12 corresponding to the circumferential gaps in FIG. 2 at the time of enlargement are preferably 0, but they are values very close to 0 that cause negligible traces and bounces on the tape. There is no problem. 1 is provided, the minimum diameter can be reduced and the shaft can be easily removed.
[0014]
【The invention's effect】
According to the invention of claim 1, even if it is a leaf type, there is no fear of forming a trace on the tape to be wound, and the occurrence of bounce can be effectively avoided, so that the winding speed can be increased and the efficiency can be improved. Benefits arise. Since the second leaf 17 (FIG. 1) rotates in the X1 and X2 directions during the expansion, it is easy to reliably set the clearance on the circumference to zero.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a tape take-up shaft according to the present invention when it is reduced.
FIG. 2 is a cross-sectional view of the tape take-up shaft of FIG. 1 when enlarged.
FIG. 3 is a cross-sectional view at the time of reduction in a reference example .
4 is a cross-sectional view of the tape take-up shaft of FIG. 3 when enlarged.
FIG. 5 is a schematic vertical sectional view of a conventional structure.
[Explanation of symbols]
3 Drum 5 Expanding body 7 Clearance 11 Shaft 14 First leaf 17 Second leaf 18, 19 Slope 25 Second leaf P1 point (fulcrum)

Claims

A drum, a first leaf that is fixed or movable on the outside of the drum, a second leaf that is movable, and an expansion body that is disposed in the drum to expand the leaf. The first leaf and the second leaf cooperate to form a large-diameter shaft with no gap on the outer periphery .
A first leaf and a pair of second leaves adjacent to the first leaf, the second leaf forming a fulcrum against the inner surface of the drum opposite to the first leaf, and the second leaf A tape take-up shaft, characterized in that a slope at which the end opposite to the fulcrum abuts is provided at the first leaf end when expanding while rotating about the fulcrum .