JP7018186B2 - Web winding device and web winding method - Google Patents

Web winding device and web winding method Download PDF

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JP7018186B2
JP7018186B2 JP2017175680A JP2017175680A JP7018186B2 JP 7018186 B2 JP7018186 B2 JP 7018186B2 JP 2017175680 A JP2017175680 A JP 2017175680A JP 2017175680 A JP2017175680 A JP 2017175680A JP 7018186 B2 JP7018186 B2 JP 7018186B2
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shaft
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winding
diameter
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JP2019052002A (en
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哲 岩田
隆臣 栗塚
崇 三嶋
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TOSHIN CO.,LTD.
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本発明は、ウェブ(フィルム、紙、金属箔等の可撓性を有する長尺の帯状物)の巻取装置及び巻取方法に関する。 The present invention relates to a winding device and a winding method for a web (a long strip having flexibility such as a film, paper, metal foil, etc.).

この種の装置として、特許文献1に記載のものが提案されている。これによれば、タッチロールを用いてウェブの巻取張力を制御している。 As a device of this type, the device described in Patent Document 1 has been proposed. According to this, the take-up tension of the web is controlled by using the touch roll.

しかし、特許文献1に記載の技術では、巻取軸側に巻き取られた巻取ウェブに対するタッチロールの押圧力により巻取張力を制御するという構造上、巻取張力が低張力の場合の制御が困難であるという問題があった。 However, in the technique described in Patent Document 1, the take-up tension is controlled by the pressing force of the touch roll against the take-up web wound on the take-up shaft side, so that the control is performed when the take-up tension is low. There was a problem that it was difficult.

特開2012-166896号公報Japanese Unexamined Patent Publication No. 2012-166896

本発明は、このような事情に鑑みてなされたものであり、巻取張力が低張力であっても制御が可能なウェブの巻取装置及び巻取方法を提供することを目的としている。 The present invention has been made in view of such circumstances, and an object of the present invention is to provide a web winding device and a winding method capable of controlling even if the winding tension is low.

上記課題を解決するために、本発明に係るウェブ巻取装置は、
原反ウェブの芯管を装着可能で、エアフリクションシャフトよりなる繰出軸と、
巻芯管を装着可能で、エアシャフトよりなる巻取軸と、
前記繰出軸と前記巻取軸との中間に配置され、前記繰出軸側から前記巻取軸側へ送られたウェブの長さを計測する送り長計測手段と、
前記巻取軸の回転数を計測する回転数計測手段と、
前記送り長計測手段によって計測された前記ウェブの長さと前記回転数計測手段によって計測された前記巻取軸の回転数から前記巻芯管に巻き取られたウェブの外径、当該ウェブの厚み及び前記原反ウェブの外径を算出する算出手段と、を備え、
前記巻取軸を回転駆動させる巻取モータによる巻取トルクを、前記算出手段によって算出された前記巻取ウェブの外形の増大に応じて増加させ、前記エアフリクションシャフトのフリクショントルクを、前記算出手段によって算出された前記原反ウェブの外径の減少に応じて減少させることを特徴としている。
In order to solve the above problems, the web winding device according to the present invention is used.
A core tube of the original web can be attached, and a feeding shaft consisting of an air friction shaft and
A winding core tube can be attached, and a winding shaft consisting of an air shaft and
A feed length measuring means arranged between the feed shaft and the take-up shaft and measuring the length of the web sent from the feed shaft side to the take-up shaft side.
A rotation speed measuring means for measuring the rotation speed of the take-up shaft, and
From the length of the web measured by the feed length measuring means and the rotation speed of the winding shaft measured by the rotation speed measuring means, the outer diameter of the web wound around the core tube, the thickness of the web, and the thickness of the web. A calculation means for calculating the outer diameter of the original web is provided.
The take-up torque by the take-up motor for rotationally driving the take-up shaft is increased according to the increase in the outer shape of the take-up web calculated by the calculation means, and the friction torque of the air friction shaft is calculated by the calculation means. It is characterized in that it decreases according to the decrease in the outer diameter of the raw fabric web calculated by .

本発明によれば、張力の制御にエアフリクションシャフトを用いているため、巻取張力が低張力であっても制御が可能となる。 According to the present invention, since the air friction shaft is used to control the tension, it is possible to control even if the winding tension is low.

また、上記構成では、巻取モータによる巻取トルクは、通常、巻取軸に巻き取られるウェブ巻径の増大に応じて増加させる必要があり、エアフリクションシャフトのフリクショントルクは、繰出軸に装着されている原反ウェブの巻径の減少に応じて減少させる必要がある。 Further, in the above configuration, the take-up torque by the take-up motor usually needs to be increased according to the increase in the web winding diameter taken up by the take-up shaft, and the friction torque of the air friction shaft is mounted on the take-out shaft. It is necessary to reduce it according to the decrease in the winding diameter of the original fabric web.

この点、本発明によれば、簡単な構成により巻取ウェブの外径及び原反ウェブの外径を算出することができ、もって、簡単な構成により低張力制御が可能なウェブの巻取装置及び巻取方法を提供することができる。 In this regard, according to the present invention, the outer diameter of the take-up web and the outer diameter of the original fabric web can be calculated by a simple configuration, and the web take-up device capable of low tension control by a simple configuration. And winding methods can be provided.

ウェブ巻取装置の概略を示した説明図である。It is explanatory drawing which showed the outline of the web winding apparatus.

以下、本発明のウェブ巻取装置及び巻取方法を具現化した実施形態について、図面を用いて説明するが、本発明の技術的範囲は、もちろんこれだけに限定されるものではない。なお、周知の技術に関しては、詳細な説明を省略する。 Hereinafter, embodiments embodying the web winding device and winding method of the present invention will be described with reference to the drawings, but the technical scope of the present invention is, of course, not limited to this. The detailed description of the well-known technique will be omitted.

まず、第1の実施形態であるウェブ巻取装置1について、図1を参照して説明する。図1は、ウェブ巻取装置1の概略を示す説明図である。
図1に示すように、ウェブ巻取装置1は、主に繰出軸10と、巻取軸20と、支持ローラ30、30と、ロータリーエンコーダ40(送り長計測手段に相当する)と、エンコーダ付モータM(回転数計測手段に相当する)と、演算部50(算出手段に相当する)で構成される。ウェブ巻取装置1は、原反ウェブW1から繰り出されたウェブWをその長手方向に沿って搬送し、巻取ウェブW2として巻き取るリワインダである。ウェブWは、例えば、食品包装用のフィルムなどであるが、これに限られないのはもちろんである。
First, the web winding device 1 according to the first embodiment will be described with reference to FIG. FIG. 1 is an explanatory diagram showing an outline of the web winding device 1.
As shown in FIG. 1, the web winding device 1 mainly includes a feeding shaft 10, a winding shaft 20, support rollers 30 and 30, a rotary encoder 40 (corresponding to a feed length measuring means), and an encoder. It is composed of a motor M (corresponding to a rotation speed measuring means) and a calculation unit 50 (corresponding to a calculating means). The web winding device 1 is a rewinder that conveys the web W unwound from the raw fabric web W1 along the longitudinal direction thereof and winds it as the winding web W2. The web W is, for example, a film for food packaging, but of course, the web W is not limited to this.

繰出軸10は、エアフリクションシャフトからなり、原反ウェブW1の芯管C1が装着可能となっている。原反ウェブW1は、円筒状の芯管C1にウェブWが巻回された部材である。
図示しないエアフリクションシャフトは、外周面から出没自在の巻芯チャッキング用片を備え、空気圧に比例したフリクショントルクが得られる多数の独立したフリクションユニットを同軸上に並設したもので周知の技術である。芯管C1には、通常、中空状の紙巻芯が用いられている。
The feeding shaft 10 is composed of an air friction shaft, and the core tube C1 of the raw fabric web W1 can be mounted. The raw web W1 is a member in which the web W is wound around a cylindrical core tube C1.
The air friction shaft (not shown) is equipped with a core chucking piece that can freely appear and disappear from the outer peripheral surface, and is a well-known technology in which a large number of independent friction units that can obtain friction torque proportional to the air pressure are arranged coaxially. be. A hollow paper winding core is usually used for the core tube C1.

巻取軸20は、周知の技術であるエアシャフトからなり、巻芯管C2が装着可能となっている。巻芯管C2も、通常、中空状の紙巻芯を用いる。巻取軸20が後述のエンコーダ付モータMによって所定の方向に回転駆動されることにより、原反ウェブW1からウェブWが繰り出されると共に、ウェブWが巻芯管C2に巻き取られる。こうして、巻取軸20の外周面上に、その軸方向に沿って、巻取ウェブW2が形成されることとなる。巻取ウェブW2は、ウェブ巻取装置1の最終製品である。 The take-up shaft 20 is made of an air shaft, which is a well-known technique, and a winding core tube C2 can be attached to the take-up shaft 20. As the core tube C2, a hollow paper core is usually used. When the take-up shaft 20 is rotationally driven in a predetermined direction by a motor M with an encoder described later, the web W is unwound from the raw web W1 and the web W is taken up by the winding core tube C2. In this way, the winding web W2 is formed on the outer peripheral surface of the winding shaft 20 along the axial direction thereof. The take-up web W2 is the final product of the web take-up device 1.

支持ローラ30、30は、軸心周りに回転可能なローラである。原反ウェブW1から繰り出されたウェブWを複数の位置で支持することで、ウェブWの搬送経路を形成する。 The support rollers 30 and 30 are rollers that can rotate around the axis. By supporting the web W unwound from the original web W1 at a plurality of positions, a transport path for the web W is formed.

ロータリーエンコーダ40は、繰出軸10と巻取軸20との中間に配置され、繰出軸10側から巻取軸20側へ送られたウェブWの長さSを計測する。
ロータリーエンコーダ40は、本実施形態では、図1に示すように、片側の支持ローラ30に接するように設けているが、どちらの支持ローラ30に接するように設けてもよいし、直接ウェブWに接するように設けてもよいのはもちろんである。
ロータリーエンコーダ40は、ロータリーエンコーダ40の回転軸の回転角度に基づいて、送られたウェブWの長さSを算出可能となっている。例えば、ロータリーエンコーダ40の半径をr(m)とし、回転角度をθ(°)とすると、送られたウェブWの長さSは、以下の式1のように表すことができる。
S(m)=2×π×r×θ/360…式1
The rotary encoder 40 is arranged between the feeding shaft 10 and the winding shaft 20, and measures the length S of the web W sent from the feeding shaft 10 side to the winding shaft 20 side.
In the present embodiment, the rotary encoder 40 is provided so as to be in contact with the support roller 30 on one side as shown in FIG. 1, but it may be provided so as to be in contact with either support roller 30 or directly on the web W. Of course, it may be provided so as to be in contact with each other.
The rotary encoder 40 can calculate the length S of the sent web W based on the rotation angle of the rotation axis of the rotary encoder 40. For example, assuming that the radius of the rotary encoder 40 is r (m) and the rotation angle is θ (°), the length S of the sent web W can be expressed by the following equation 1.
S (m) = 2 × π × r × θ / 360 ... Equation 1

エンコーダ付モータMは、巻取軸20に直結され、巻取軸20を回転駆動するとともに、巻取軸20の回転数を計測する。回転数は、ぴったり何回転という正確なタイミングで計測する。エンコーダ付モータMは、演算部50と双方向に電気的に接続されており、エンコーダ付モータMが検出した巻取軸20の回転数情報を演算部50が取得可能となっているとともに、演算部50は、巻取ウェブW2の外径(半径)R2に応じて、エンコーダ付モータMが発生するトルクを制御する。 The motor M with an encoder is directly connected to the take-up shaft 20, drives the take-up shaft 20 to rotate, and measures the rotation speed of the take-up shaft 20. The number of revolutions is measured at the exact timing of exactly how many revolutions. The motor M with an encoder is electrically connected to the calculation unit 50 in both directions, and the calculation unit 50 can acquire the rotation speed information of the take-up shaft 20 detected by the motor M with an encoder, and also performs calculation. The unit 50 controls the torque generated by the encoder-equipped motor M according to the outer diameter (radius) R2 of the take-up web W2.

また、演算部50は、ロータリーエンコーダ40によって計測されたウェブの長さSと、エンコーダ付モータMによって計測された巻取軸20の回転数から巻芯管C2に巻き取られた巻取ウェブW2の外径(半径)R2、ウェブWの厚みt及び原反ウェブW1の外径(半径)R1を算出する。具体的な算出の方法を以下に示す。以下、原反ウェブW1の外径(半径)R1を算出するまでの部分は、第2の実施形態であるウェブ巻取方法の説明を兼ねるものである。
巻取軸20がちょうど1回転したときに、ウェブWが長さS(m)送られたとすると、その時点での巻取ウェブW2の外径(半径)R2(m)は、以下の式2のように表すことができる。
R2(m)=S/(2×π)…式2
Further, the calculation unit 50 has a take-up web W2 wound around the core tube C2 from the length S of the web measured by the rotary encoder 40 and the rotation speed of the take-up shaft 20 measured by the motor M with an encoder. The outer diameter (radius) R2 of the web W, the thickness t of the web W, and the outer diameter (radius) R1 of the raw web W1 are calculated. The specific calculation method is shown below. Hereinafter, the part up to the calculation of the outer diameter (radius) R1 of the original web W1 also serves as an explanation of the web winding method according to the second embodiment.
Assuming that the web W is sent by a length S 1 (m) when the take-up shaft 20 makes exactly one rotation, the outer diameter (radius) R2 1 (m) of the take-up web W 2 at that time is as follows. It can be expressed as Equation 2.
R2 1 (m) = S 1 / (2 × π) ... Equation 2

巻取軸20がちょうどもう1回転(2回転目)したときにウェブWが長さS(m)送られたとすると、その時点での巻取ウェブW2の外径(半径)R2(m)は、以下の式3のように表すことができる。
R2(m)=S/(2×π)…式3
そうすると、ウェブWの厚みt(m)は、R2とR2の差であるから、以下の式4のように表すことができる。
t(m)=S/(2×π)-S/(2×π)=(S-S)/(2×π)…式4
巻取軸20がさらに回転し、ちょうど10回転したときの10回転目(1回転)にウェブWが長さS10(m)送られたとすると、その時点での巻取ウェブW2の外径(半径)R210(m)は、以下の式5のように表すことができる。
R210(m)=S10/(2×π)…式5
そうすると、ウェブWの厚みt(m)は、R210とR2の差を10で割ったものであるから、以下の式6のように表すことができる。
t(m)=(S10-S)/(2×π×10)…式6
回転数が増えれば、このように平均が取れるため、より正確にウェブWの厚みt(m)を算出することができる。平均を取る方法としては、R2とR2の差から厚みtを求め、R2とR2の差から厚みtを求め、R2とR2の差から厚みtを求め、と1周毎に厚みtを求め、それらの平均を求める等、様々な方法が考えられるが、そのいずれを用いてもよい。また、巻取ウェブW2の外径(半径)R2を複数算出し、その値からウェブWの厚みt(m)を算出する方法としては、周知の統計的手法を用いてもよい。
Assuming that the web W is sent by the length S 2 (m) when the take-up shaft 20 makes exactly one more rotation (second rotation), the outer diameter (radius) of the take-up web W2 at that time is R2 2 (m). ) Can be expressed as the following equation 3.
R2 2 (m) = S 2 / (2 × π) ... Equation 3
Then, since the thickness t (m) of the web W is the difference between R2 2 and R21, it can be expressed as the following equation 4 .
t (m) = S 2 / (2 x π) -S 1 / (2 x π) = (S 2 -S 1 ) / (2 x π) ... Equation 4
Assuming that the web W is sent by the length S10 (m) at the 10th rotation (1 rotation) when the winding shaft 20 is further rotated and exactly 10 rotations, the outer diameter of the winding web W2 at that time (1 rotation) ( Radius) R2 10 (m) can be expressed as the following equation 5.
R2 10 (m) = S 10 / (2 × π) ... Equation 5
Then, since the thickness t (m) of the web W is the difference between R2 10 and R21 divided by 10 , it can be expressed as the following equation 6.
t (m) = (S 10 -S 1 ) / (2 × π × 10) ... Equation 6
As the number of rotations increases, the average can be obtained in this way, so that the thickness t (m) of the web W can be calculated more accurately. As a method of averaging, the thickness t 1 is obtained from the difference between R2 2 and R2 1 , the thickness t 2 is obtained from the difference between R2 3 and R2 2 , and the thickness t 3 is obtained from the difference between R2 4 and R2 3 . Various methods can be considered, such as finding the thickness t x for each round and finding the average of them, but any of them may be used. Further, as a method of calculating a plurality of outer diameters (radii) R2 of the winding web W2 and calculating the thickness t (m) of the web W from the values, a well-known statistical method may be used.

巻取軸20をエアフリクションシャフトとし、繰出軸10をエアシャフトとし、繰出軸10にエンコーダを設ければ、同じようにしてウェブWの厚みtを計算によって求めることができなくはない。しかし、巻取ウェブW2の巻き始めの段階では、原反ウェブW1の外径(半径)R1は、巻取ウェブW2の外径(半径)R2の10倍程度であることが多い。つまり、巻き始めにおいては、原反ウェブW1が1回転する間に巻取ウェブW2は約10回転することになる。前述のとおり、回転数が増えるほど、より正確なウェブWの厚みtを算出することができるため、本発明のように繰出軸10をエアフリクションシャフトとしたほうが、短時間で(上記の場合なら単純計算で約10分の1の時間で)エアフリクションシャフト側のウェブ外径を算出するのに必要な精度のウェブWの厚みtを求めることができる。 If the take-up shaft 20 is an air friction shaft, the feeding shaft 10 is an air shaft, and the feeding shaft 10 is provided with an encoder, the thickness t of the web W can be obtained by calculation in the same manner. However, at the initial stage of winding of the winding web W2, the outer diameter (radius) R1 of the raw fabric web W1 is often about 10 times the outer diameter (radius) R2 of the winding web W2. That is, at the beginning of winding, the winding web W2 rotates about 10 times while the original web W1 makes one rotation. As described above, as the number of rotations increases, the thickness t of the web W can be calculated more accurately. Therefore, it is faster to use the feeding shaft 10 as the air friction shaft as in the present invention (in the above case). It is possible to obtain the thickness t of the web W with the accuracy required to calculate the web outer diameter on the air friction shaft side (in about one tenth of the time by simple calculation).

つぎに、原反ウェブW1の外径(半径)を求める方法を示す。例えば、巻取軸20が、ちょうど10回転したときの巻取ウェブW2の断面積の変化量ΔA(m)は、以下の式7のように表すことができる。
ΔA(m)=(R210 ×π)-((R2-t)×π)…式7
これは、原反ウェブW1の減少した断面積に等しい。そうすると、予め測定しておいた原反ウェブW1の初期外径(半径)をR1とし、現在の原反ウェブW1の外径(半径)をR1(m)とすると、R1(m)は、以下の式8、式9、式10のように表すことができる。
ΔA(m)=(R1 ×π)-(R1 ×π)…式8
R1 -R1 =ΔA/π…式9
R1=√(R1 -(ΔA/π))…式10
Next, a method of obtaining the outer diameter (radius) of the raw fabric web W1 will be shown. For example, the amount of change ΔA (m 2 ) in the cross-sectional area of the take-up web W2 when the take-up shaft 20 is rotated exactly 10 times can be expressed by the following equation 7.
ΔA (m 2 ) = (R2 10 2 × π) − ((R2 1 −t) 2 × π)… Equation 7
This is equal to the reduced cross-sectional area of the raw web W1. Then, assuming that the initial outer diameter (radius) of the raw fabric web W1 measured in advance is R10 and the outer diameter (radius) of the current raw fabric web W1 is R1 X (m), then R1 X (m). Can be expressed as the following equations 8, 9, and 10.
ΔA (m 2 ) = (R1 0 2 × π) − (R1 X 2 × π)… Equation 8
R1 0 2 -R1 X 2 = ΔA / π ... Equation 9
R1 X = √ (R1 0 2- (ΔA / π)) ... Equation 10

ところで、巻取張力をT、繰出軸10のフリクショントルクをft、エンコーダ付モータMの回転トルクをMtとすると、以下の式11の関係式が成り立つ。
巻取張力T=ft/R1<Mt/R2…式11
これに基づき、演算部50は、電気信号によって空気圧を制御する装置(図示しない)を介し、原反ウェブW1の外径(半径)R1に応じて繰出軸10のフリクショントルクをftを制御し、巻取ウェブW2の外径(半径)R2に応じてエンコーダ付モータMが発生するトルクを制御する。
By the way, assuming that the take-up tension is T, the friction torque of the feeding shaft 10 is ft, and the rotational torque of the motor M with an encoder is Mt, the relational expression of the following equation 11 holds.
Winding tension T = ft / R1 <Mt / R2 ... Equation 11
Based on this, the calculation unit 50 controls the friction torque of the feeding shaft 10 ft according to the outer diameter (radius) R1 of the raw fabric web W1 via a device (not shown) that controls the air pressure by an electric signal. The torque generated by the motor M with an encoder is controlled according to the outer diameter (radius) R2 of the take-up web W2.

つぎに、巻取装置1の使用方法について説明する。まず、繰出軸10に原反ウェブW1の芯管C1を装着し、巻取軸20に空の巻芯管C2を装着する。このとき、原反ウェブW1の初期外径を計測し、演算部50に入力しておく。 Next, a method of using the take-up device 1 will be described. First, the core tube C1 of the raw fabric web W1 is attached to the feeding shaft 10, and the empty winding core tube C2 is attached to the winding shaft 20. At this time, the initial outer diameter of the original fabric W1 is measured and input to the calculation unit 50.

演算部50は、巻取張力が所望の値となるように、上記のとおり算出される原反ウェブW1の外径(半径)R1に応じてフリクショントルクを制御する。その際、巻取張力を一定としてもよく、巻き始めと巻き終わりを少し大きくするなど変化を設けて設定してもよい。 The calculation unit 50 controls the friction torque according to the outer diameter (radius) R1 X of the raw fabric web W1 calculated as described above so that the winding tension becomes a desired value. At that time, the winding tension may be constant, or may be set by making changes such as slightly increasing the winding start and winding end.

また、巻取軸20でなく繰出軸10がフリクションシャフトになっていることから、設定する巻取張力をメカロス分トルクを加えた補正張力としてもよい。 Further, since the take-up shaft 10 is a friction shaft instead of the take-up shaft 20, the set take-up tension may be a correction tension to which a torque corresponding to the mechanical loss is added.

以上、本発明の実施形態について説明したが、上述した内容は、あくまでも本発明の一実施形態に関するものであって、本発明が上記内容に限定されることを意味するものではない。例えば、巻取軸がエアシャフトであることから当て板が付けやすく、巻取軸に当て板を付けたものにしてもよい。 Although the embodiments of the present invention have been described above, the above-mentioned contents are only related to one embodiment of the present invention and do not mean that the present invention is limited to the above-mentioned contents. For example, since the take-up shaft is an air shaft, it is easy to attach a backing plate, and a backing plate may be attached to the take-up shaft.

10 繰出軸
20 巻取軸
30 支持ローラ
40 ロータリーエンコーダ
50 演算部
W ウェブ
W1 原反ウェブ
W2 巻取ウェブ
C1 芯管
C2 巻芯管
M エンコーダ付モータ
R1 原反ウェブの外径(半径)
R2 巻取ウェブの外径(半径)
S 送り量
10 Feeding shaft 20 Winding shaft 30 Supporting roller 40 Rotary encoder 50 Calculation unit W Web W1 Original fabric web W2 Winding web C1 Core tube C2 Winding core tube M Motor with encoder R1 Original fabric web outer diameter (radius)
Outer diameter (radius) of R2 take-up web
S feed amount

Claims (1)

ウェブの巻取装置であって、
原反ウェブの芯管を装着可能で、エアフリクションシャフトよりなる繰出軸と、
巻芯管を装着可能で、エアシャフトよりなる巻取軸と、
前記繰出軸と前記巻取軸との中間に配置され、前記繰出軸側から前記巻取軸側へ送られたウェブの長さを計測する送り長計測手段と、
前記巻取軸の回転数を計測する回転数計測手段と、
前記送り長計測手段によって計測された前記ウェブの長さと前記回転数計測手段によって計測された前記巻取軸の回転数から前記巻芯管に巻き取られた巻取ウェブの外径、当該ウェブの厚み及び前記原反ウェブの外径を算出する算出手段と、を備え、
前記巻取軸を回転駆動させる巻取モータによる巻取トルクを、前記算出手段によって算出された前記巻取ウェブの外形の増大に応じて増加させ、前記エアフリクションシャフトのフリクショントルクを、前記算出手段によって算出された前記原反ウェブの外径の減少に応じて減少させることを特徴とするウェブ巻取装置。
It ’s a web taker,
A core tube of the original web can be attached, and a feeding shaft consisting of an air friction shaft and
A winding core tube can be attached, and a winding shaft consisting of an air shaft and
A feed length measuring means arranged between the feed shaft and the take-up shaft and measuring the length of the web sent from the feed shaft side to the take-up shaft side.
A rotation speed measuring means for measuring the rotation speed of the take-up shaft, and
The outer diameter of the winding web wound around the core tube from the length of the web measured by the feed length measuring means and the rotation speed of the winding shaft measured by the rotation speed measuring means, the outer diameter of the web. A calculation means for calculating the thickness and the outer diameter of the original web is provided.
The take-up torque by the take-up motor for rotationally driving the take-up shaft is increased according to the increase in the outer shape of the take-up web calculated by the calculation means, and the friction torque of the air friction shaft is calculated by the calculation means. A web winding device, characterized in that it decreases in accordance with a decrease in the outer diameter of the raw web calculated by .
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Publication number Priority date Publication date Assignee Title
JP2005231832A (en) 2004-02-20 2005-09-02 Mitsubishi Electric Corp Unwinding/winding device and unwinding/winding system using it
JP2007302468A (en) 2006-05-15 2007-11-22 Mimaki Engineering Co Ltd Printing device, conveying device and printing method
JP2009062141A (en) 2007-09-06 2009-03-26 Sekisui Chem Co Ltd Sheet conveying device
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