JP6417735B2 - Roller clamp mechanism pair - Google Patents

Roller clamp mechanism pair Download PDF

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JP6417735B2
JP6417735B2 JP2014121317A JP2014121317A JP6417735B2 JP 6417735 B2 JP6417735 B2 JP 6417735B2 JP 2014121317 A JP2014121317 A JP 2014121317A JP 2014121317 A JP2014121317 A JP 2014121317A JP 6417735 B2 JP6417735 B2 JP 6417735B2
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roller
movable roller
support shaft
shaft
spring
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JP2016000649A (en
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純 下泉
純 下泉
吉川　桂介
桂介 吉川
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JTEKT Corp
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本発明は、シート材の供給又は送りに使用するローラクランプ装置に関するものである。   The present invention relates to a roller clamp device used for supplying or feeding a sheet material.

固定ローラと可動ローラが近接する方向に可動ローラを移動させて、固定ローラと可動ローラの間にシート材を保持するローラクランプ機構において、可動ローラを偏心軸心で自転可能に支持し、偏心軸心の公転運動により可動ローラを移動させる技術がある。（例えば、特許文献１参照）   In the roller clamp mechanism that holds the sheet material between the fixed roller and the movable roller by moving the movable roller in the direction in which the fixed roller and the movable roller approach each other, the movable roller is supported by the eccentric shaft center so as to be rotatable. There is a technique for moving the movable roller by the revolving motion of the heart. (For example, see Patent Document 1)

特開平９−１７５６８０号公報Japanese Patent Laid-Open No. 9-175680

特許文献１の技術によれば、偏心軸心の公転運動をモータにより駆動しており、機構が複雑で、占有スペースが大きく価格が高価である。
本発明は上記事情に鑑みてなされたものであり、占有スペースが小さく、簡易な構造で、固定ローラに可動ローラを圧接させるとともに、圧接力を容易に調整できるローラクランプ機構を提供することを目的とする。 According to the technique of Patent Document 1, the revolving motion of the eccentric shaft center is driven by a motor, the mechanism is complicated, the occupied space is large, and the price is expensive.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a roller clamp mechanism that has a small occupied space, has a simple structure, presses a movable roller against a fixed roller, and can easily adjust the pressing force. And

上記の課題を解決するための請求項１に係る発明の特徴は、本体と、前記本体に回転可能に支持される固定ローラと、前記本体に自転軸回りに回転可能に支持される支持軸部および前記自転軸に対し偏心した公転軸を有し前記支持軸部に対して軸方向にずらして配置された可動ローラ支持軸部を備える可動ローラ軸と、前記可動ローラ支持軸部に前記公転軸回りに回転可能に支持された可動ローラと、一端が前記可動ローラ軸に一体回転可能に係合する腕部材と、前記可動ローラが前記固定ローラに近づく方向に前記腕部材に引っ張り力を作用させるばねとを備え、前記可動ローラ軸を前記自転軸回りに回転して前記可動ローラを公転させることで、前記固定ローラと前記可動ローラの相対位置を調整しシート材を把持し、前記支持軸部に対する前記可動ローラ支持軸部の偏心方向は、前記可動ローラと前記固定ローラが接触した状態において、前記可動ローラと前記固定ローラの回転中心を結ぶ直線に対しておおむね直交する方向に配置されているローラクランプ機構と、両端に前記ローラクランプ機構を１個ずつ配置するとともに前記固定ローラおよび前記可動ローラが前記本体に対して内側となるように配置し、２個の前記固定ローラが互いに平行となるように対向して配置するベースと、前記ベースの中央部に固定され、前記自転軸と直交し、前記偏心方向とおおむね平行する支持軸と、前記ばねの他端を取り付ける第２のばね取付け部を両端部に備え、２つの前記第２のばね取付け部から等距離となる位置で前記支持軸により回転自在に支持されるアームとを備え、前記腕部材の他端に第１のばね取付け部を備え、前記ばねは、一端を前記第１のばね取付け部に取り付けるとともに、他端を前記第２のばね取付け部に取り付けたことである。
The feature of the invention according to claim 1 for solving the above-mentioned problems is that a main body, a fixed roller rotatably supported by the main body, and a support shaft portion rotatably supported by the main body around a rotation axis. A movable roller shaft having a revolving shaft that is eccentric with respect to the rotation shaft, and a movable roller support shaft portion that is arranged to be shifted in the axial direction with respect to the support shaft portion; and the revolving shaft on the movable roller support shaft portion A movable roller supported rotatably around the arm, an arm member having one end engaged with the movable roller shaft so as to rotate integrally therewith, and a pulling force acting on the arm member in a direction in which the movable roller approaches the fixed roller and a spring, the movable roller shaft in the revolving the movable roller rotates in the rotation axis to adjust the relative position of the fixed roller and the movable roller to grip the sheet material, prior Symbol support shaft Vs part Eccentric direction of the movable roller support shaft portion that is in a state in which the fixing roller and the movable roller are in contact, are arranged in a direction substantially perpendicular to the straight line connecting the rotational center of the movable roller and the fixed roller A roller clamp mechanism and one roller clamp mechanism are arranged at both ends, and the fixed roller and the movable roller are arranged inside the main body, and the two fixed rollers are parallel to each other. And a second spring mounting portion for mounting the other end of the spring, the support shaft being fixed to the central portion of the base, being perpendicular to the rotation axis, and being substantially parallel to the eccentric direction. At both ends, and an arm rotatably supported by the support shaft at a position equidistant from the two second spring mounting portions, Comprising a first spring mount portion to the other end of the member, the spring is attached at one end to said first spring attachment portion is to attached the other end to the second spring mount portion.

請求項２に係る発明の特徴は、本体と、前記本体に回転可能に支持される固定ローラと、前記本体に自転軸回りに回転可能に支持される支持軸部および前記自転軸に対し偏心した公転軸を有し前記支持軸部に対して軸方向にずらして配置された可動ローラ支持軸部を備える可動ローラ軸と、前記可動ローラ支持軸部に前記公転軸回りに回転可能に支持された可動ローラと、一端が前記可動ローラ軸に一体回転可能に係合する腕部材と、前記可動ローラが前記固定ローラに近づく方向に前記腕部材に引っ張り力を作用させるばねとを備え、前記可動ローラ軸を前記自転軸回りに回転して前記可動ローラを公転させることで、前記固定ローラと前記可動ローラの相対位置を調整しシート材を把持し、前記支持軸部に対する前記可動ローラ支持軸部の偏心方向は、前記可動ローラと前記固定ローラが接触した状態において、前記可動ローラと前記固定ローラの回転中心を結ぶ直線に対しておおむね直交する方向に配置されているローラクランプ機構と、両端に前記ローラクランプ機構を１個ずつ配置するとともに前記固定ローラおよび前記可動ローラが前記本体に対して内側となるように配置し、２個の前記固定ローラが互いに平行となるように対向して配置するベースと、前記ベースの中央部に第２のばね取付け部を固定し、前記連結部材の中央部に前記第１のばね取付け部を配置し、前記ばねは、一端を前記第１のばね取付け部に取り付けるとともに、他端を前記第２のばね取付け部に取り付けたことである。
The feature of the invention according to claim 2 is eccentric with respect to the main body, a fixed roller rotatably supported by the main body, a support shaft portion rotatably supported by the main body around a rotation axis, and the rotation axis. A movable roller shaft having a revolving shaft and having a movable roller support shaft portion arranged to be shifted in the axial direction with respect to the support shaft portion, and supported by the movable roller support shaft portion so as to be rotatable around the revolution shaft. A movable roller; an arm member having one end engaged with the movable roller shaft so as to be integrally rotatable; and a spring that applies a tensile force to the arm member in a direction in which the movable roller approaches the fixed roller. By rotating the shaft around the rotation shaft to revolve the movable roller, the relative position between the fixed roller and the movable roller is adjusted, the sheet material is gripped, and the movable roller support shaft portion with respect to the support shaft portion Eccentric direction, in a state where the fixing roller and the movable roller are in contact, the roller clamp mechanism disposed in a direction substantially perpendicular to the straight line connecting the rotational center of the movable roller and the fixed roller, before the two ends The roller clamp mechanism is arranged one by one, the fixed roller and the movable roller are arranged inside the main body, and the two fixed rollers are arranged opposite to each other so as to be parallel to each other. A base and a second spring mounting portion are fixed to a central portion of the base, and the first spring mounting portion is disposed at a central portion of the connecting member, and one end of the spring is the first spring mounting portion. And the other end is attached to the second spring attachment portion.

請求項１−２に係る発明によれば、シート材の両端にある各々の可動ローラの押し付け力が等しくなる、シート材の両端に作用する力が自動的に等しくなるので、シート材が蛇行や、斜行することが起きにくいローラクランプ機構対を実現できる。
According to the invention according to claim 1-2, the pressing force of each of the variable dynamic rollers at the ends of the sheet material are equal, the force acting on the opposite ends of the sheet material is automatically equal, the sheet material is meander In addition, it is possible to realize a roller clamp mechanism pair that is less likely to skew.

請求項１−２に係る発明によれば、シート材の両端にある各々の可動ローラの押し付け力が等しくなる、シート材の両端に作用する力が自動的に等しくなるので、シート材が蛇行や、斜行することが起きにくいローラクランプ機構対を実現できる。
 According to the invention of claim 1-2, the pressing force of each movable roller at both ends of the sheet material becomes equal, and the force acting on both ends of the sheet material is automatically equalized. Thus, it is possible to realize a pair of roller clamp mechanisms that hardly cause skewing .

本発明の実施形態の斜視図である。It is a perspective view of the embodiment of the present invention. 図３のＢ−Ｂ断面図である。It is BB sectional drawing of FIG. 図1のＡ矢視図である。FIG. 2 is a view as seen from an arrow A in FIG. 1. 本発明の第１の変形形態の斜視図である。It is a perspective view of the 1st modification of this invention.

本発明の実施形態を説明する。
図１に示すように、実施形態のローラクランプ機構対１は、ベース２の下部に本体３０、３１が対向して配置されている。本体３０、３１の下部には固定ローラ６０、６１が対向して各々回転自在に本体３０、３１により保持されている。可動ローラ５０、５１は図１には図示されない可動ローラ軸１０の一端に公転可能かつ回転自在に支持されている（後に詳細を説明する）。可動ローラ軸１０の他端には腕部材４０、４１が係合している。腕部材４０、４１の端部に第１のばね取付け部１１を備えている。 An embodiment of the present invention will be described.
As shown in FIG. 1, in the roller clamp mechanism pair 1 according to the embodiment, main bodies 30 and 31 are arranged to face a lower portion of a base 2. Fixed rollers 60 and 61 are opposed to the lower portions of the main bodies 30 and 31 and held by the main bodies 30 and 31 so as to be rotatable. The movable rollers 50 and 51 are revolved and rotatably supported at one end of a movable roller shaft 10 (not shown in FIG. 1) (details will be described later). Arm members 40 and 41 are engaged with the other end of the movable roller shaft 10. A first spring mounting portion 11 is provided at the end of the arm members 40 and 41.

ベース２の側面には、自らの中央部で支持軸９により回転自在に支持されたアーム８を備えている。支持軸９から等距離となるアーム８の両端部に第２のばね取付け部１２を備えている。第１のばね取付け部１１と第２のばね取付け部１２の間に各々ばね７が張力の作用する状態で取り付けられている。   On the side surface of the base 2, there is provided an arm 8 that is rotatably supported by a support shaft 9 at its center. Second spring mounting portions 12 are provided at both ends of the arm 8 that are equidistant from the support shaft 9. Each of the springs 7 is attached between the first spring attachment portion 11 and the second spring attachment portion 12 in a state where a tension acts.

図２、図３に基づき、可動ローラ５０の公転運動の詳細を説明する。
図２において、可動ローラ軸１０は自転軸１０ｄを中心とする支持軸部１０ａと、自転軸１０ｄに対してｅだけ偏心した公転軸１０ｃを中心とする可動ローラ支持軸部１０ｂを備えている。支持軸部１０ａはベアリング１３を介して本体３０により回転自在に支持されている。可動ローラ５０はベアリング１４を介して可動ローラ軸１０の可動ローラ支持軸部１０ｂに回転自在に支持されている。支持軸部１０ａの端面に腕部材４０がボルト１５により係合されている。 The details of the revolving motion of the movable roller 50 will be described with reference to FIGS.
In FIG. 2, the movable roller shaft 10 includes a support shaft portion 10a centered on the rotation shaft 10d, and a movable roller support shaft portion 10b centered on a revolution shaft 10c that is eccentric by e with respect to the rotation shaft 10d. The support shaft portion 10 a is rotatably supported by the main body 30 via the bearing 13. The movable roller 50 is rotatably supported by the movable roller support shaft portion 10 b of the movable roller shaft 10 via the bearing 14. The arm member 40 is engaged with the end surface of the support shaft portion 10a by the bolt 15.

図３において、支持軸部１０ａと可動ローラ支持軸部１０ｂの偏心方向は、可動ローラ５０と固定ローラ６０が接触した状態において、可動ローラ５０と固定ローラ６０の回転中心を結ぶ直線に対しておおむね直交する方向に配置されている。腕部材４０のボルト１５の挿入穴４０ａは長穴で腕部材４０の取り付け位置を調整できるので、自転軸１０ｄと第１のばね取付け部１１の間の距離Ｌを調整できる。この距離を調整することで、ばね７の張力により可動ローラ軸１０に作用するトルクを調整できる。
対向する可動ローラ５１も同様にして、ばね７の張力により可動ローラ軸１０に作用するトルクを調整できる。
ここで、腕部材４０、４１の取り付け位置を一定とし、支持軸９の位置を上下方向に調整する調整機構を付加することで、ばね７の張力を調整して可動ローラ軸１０に作用するトルクを調整してもよい。
In FIG. 3, the eccentric directions of the support shaft portion 10 a and the movable roller support shaft portion 10 b are approximately with respect to a straight line connecting the rotation centers of the movable roller 50 and the fixed roller 60 when the movable roller 50 and the fixed roller 60 are in contact with each other. It is arranged in the direction perpendicular. Since the insertion hole 40a of the bolt 15 of the arm member 40 is a long hole and the mounting position of the arm member 40 can be adjusted, the distance L between the rotation shaft 10d and the first spring mounting portion 11 can be adjusted. By adjusting this distance, the torque acting on the movable roller shaft 10 by the tension of the spring 7 can be adjusted.
Similarly, the opposing movable roller 51 can adjust the torque acting on the movable roller shaft 10 by the tension of the spring 7.
Here, the torque applied to the movable roller shaft 10 by adjusting the tension of the spring 7 by adding an adjusting mechanism that adjusts the position of the support shaft 9 in the vertical direction while keeping the mounting positions of the arm members 40 and 41 constant. May be adjusted.

以上の構造により、ばね７の張力が腕部材４０、４１に働くが、支持軸９から第２のばね取付け部１２までの距離が等しいので、アーム８の回転方向の釣合いにより腕部材４０、４１に働く力は等しくなる。このため、腕部材４０、４１の取り付け位置を同じにしておけば、可動ローラ軸１０に作用するトルクも等しくなり、可動ローラ５０、５１の公転運動により可動ローラ５０、５１が固定ローラ６０、６１に押し付けられる圧接力も等しくなる。   With the above structure, the tension of the spring 7 acts on the arm members 40 and 41, but since the distance from the support shaft 9 to the second spring mounting portion 12 is equal, the arm members 40 and 41 are balanced by the balance of the rotation direction of the arm 8. The forces that work on are equal. For this reason, if the attachment positions of the arm members 40 and 41 are made the same, the torque acting on the movable roller shaft 10 becomes equal, and the movable rollers 50 and 51 are fixed to the fixed rollers 60 and 61 by the revolving motion of the movable rollers 50 and 51. The pressing force that is pressed against is also equal.

その結果、図１に示すようにシート材Ｗの一端を、可動ローラ５０と固定ローラ６０で挟むことで保持し、他端を可動ローラ５１と固定ローラ６１で挟むことで保持した場合に、保持力が等しくなるため、シート材Ｗが蛇行や、斜行することが起きにくいローラクランプ機構対を実現できる。   As a result, as shown in FIG. 1, one end of the sheet material W is held by being sandwiched between the movable roller 50 and the fixed roller 60, and the other end is held by being sandwiched between the movable roller 51 and the fixed roller 61. Since the forces are equal, it is possible to realize a roller clamp mechanism pair that is unlikely to cause the sheet material W to meander or skew.

上記の実施形態では、アーム８を用いることで、可動ローラ５０、５１が固定ローラ６０、６１に押し付けられる圧接力を等しくしたが、以下のようにしてもよい。図４に示すように、腕部材４０、４１を連結部材１０８により連結し、腕部材４０、４１から等距離の位置に第１のばね取付け部１１を配置する。ベース１０２の側面に第２のばね取付け部１２を固定し、第１のばね取付け部１１と第２のばね取付け部１２の間にばね１０７を取り付ける。こうすることで、ばね１０７の張力は等分されて腕部材４０、４１に作用し、結果として可動ローラ５０、５１が固定ローラ６０、６１に押し付けられる圧接力を等しくできる。   In the above embodiment, the arm 8 is used to equalize the pressure contact force with which the movable rollers 50 and 51 are pressed against the fixed rollers 60 and 61. However, the following may be used. As shown in FIG. 4, the arm members 40 and 41 are connected by the connecting member 108, and the first spring mounting portion 11 is disposed at a position equidistant from the arm members 40 and 41. The second spring attachment portion 12 is fixed to the side surface of the base 102, and the spring 107 is attached between the first spring attachment portion 11 and the second spring attachment portion 12. By doing so, the tension of the spring 107 is equally divided and acts on the arm members 40 and 41, and as a result, the pressure contact force with which the movable rollers 50 and 51 are pressed against the fixed rollers 60 and 61 can be made equal.

Ｗ：シート材 １、１００：ローラクランプ機構対 ２、１０２：ベース ７、１０７：ばね ８：アーム ９：支持軸 １０：可動ローラ軸 １０ａ：支持軸部 １０ｂ：可動ローラ支持軸部 １０ｄ：自転軸 １１：第１のばね取付け部 １２：第２のばね取付け部 ３０、３１：本体 ４０、４１：腕部材 ５０、５１：可動ローラ ６０、６１：固定ローラ W: sheet material 1, 100: roller clamp mechanism pair 2, 102: base 7, 107: spring 8: arm 9: support shaft 10: movable roller shaft 10a: support shaft portion 10b: movable roller support shaft portion 10d: rotation shaft 11: 1st spring attachment part 12: 2nd spring attachment part 30, 31: Main body 40, 41: Arm member 50, 51: Movable roller 60, 61: Fixed roller

Claims (2)

本体と、前記本体に回転可能に支持される固定ローラと、前記本体に自転軸回りに回転可能に支持される支持軸部および前記自転軸に対し偏心した公転軸を有し前記支持軸部に対して軸方向にずらして配置された可動ローラ支持軸部を備える可動ローラ軸と、前記可動ローラ支持軸部に前記公転軸回りに回転可能に支持された可動ローラと、一端が前記可動ローラ軸に一体回転可能に係合する腕部材と、前記可動ローラが前記固定ローラに近づく方向に前記腕部材に引っ張り力を作用させるばねとを備え、前記可動ローラ軸を前記自転軸回りに回転して前記可動ローラを公転させることで、前記固定ローラと前記可動ローラの相対位置を調整しシート材を把持し、前記支持軸部に対する前記可動ローラ支持軸部の偏心方向は、前記可動ローラと前記固定ローラが接触した状態において、前記可動ローラと前記固定ローラの回転中心を結ぶ直線に対しておおむね直交する方向に配置されているローラクランプ機構と、
両端に前記ローラクランプ機構を１個ずつ配置するとともに前記固定ローラおよび前記可動ローラが前記本体に対して内側となるように配置し、２個の前記固定ローラが互いに平行となるように対向して配置するベースと、
前記ベースの中央部に固定され、前記自転軸と直交し、前記偏心方向とおおむね平行する支持軸と、
前記ばねの他端を取り付ける第２のばね取付け部を両端部に備え、２つの前記第２のばね取付け部から等距離となる位置で前記支持軸により回転自在に支持されるアームとを備え、
前記腕部材の他端に第１のばね取付け部を備え、
前記ばねは、一端を前記第１のばね取付け部に取り付けるとともに、他端を前記第２のばね取付け部に取り付けたことを特徴とするローラクランプ機構対。 The support shaft portion includes a main body, a fixed roller rotatably supported by the main body, a support shaft portion rotatably supported around the rotation shaft by the main body, and a revolving shaft that is eccentric with respect to the rotation shaft. A movable roller shaft provided with a movable roller support shaft portion arranged to be shifted in the axial direction with respect to the movable roller shaft, a movable roller supported on the movable roller support shaft portion so as to be rotatable about the revolution shaft , and one end of the movable roller shaft An arm member that engages with the arm member so as to rotate integrally therewith, and a spring that applies a tensile force to the arm member in a direction in which the movable roller approaches the fixed roller, and rotates the movable roller shaft around the rotation shaft. by revolving the movable roller, the relative position of the fixed roller and the movable roller to grip the prepared sheet, the eccentric direction of the movable roller support shaft portion for the previous SL support shaft portion, the movable roller In a state in which the fixing roller is in contact, the roller clamp mechanism disposed in a direction substantially perpendicular to the straight line connecting the rotational center of the movable roller and the fixed roller,
One roller clamp mechanism is arranged at each end, the fixed roller and the movable roller are arranged inside the main body, and the two fixed rollers are opposed to each other in parallel. The base to place,
A support shaft fixed to the center of the base, orthogonal to the rotation axis, and substantially parallel to the eccentric direction;
A second spring attachment portion for attaching the other end of the spring to both ends, and an arm rotatably supported by the support shaft at a position equidistant from the two second spring attachment portions;
A first spring mounting portion on the other end of the arm member;
A pair of roller clamp mechanisms , wherein one end of the spring is attached to the first spring attachment portion and the other end is attached to the second spring attachment portion . 本体と、前記本体に回転可能に支持される固定ローラと、前記本体に自転軸回りに回転可能に支持される支持軸部および前記自転軸に対し偏心した公転軸を有し前記支持軸部に対して軸方向にずらして配置された可動ローラ支持軸部を備える可動ローラ軸と、前記可動ローラ支持軸部に前記公転軸回りに回転可能に支持された可動ローラと、一端が前記可動ローラ軸に一体回転可能に係合する腕部材と、前記可動ローラが前記固定ローラに近づく方向に前記腕部材に引っ張り力を作用させるばねとを備え、前記可動ローラ軸を前記自転軸回りに回転して前記可動ローラを公転させることで、前記固定ローラと前記可動ローラの相対位置を調整しシート材を把持し、前記支持軸部に対する前記可動ローラ支持軸部の偏心方向は、前記可動ローラと前記固定ローラが接触した状態において、前記可動ローラと前記固定ローラの回転中心を結ぶ直線に対しておおむね直交する方向に配置されているローラクランプ機構と、
両端に前記ローラクランプ機構を１個ずつ配置するとともに前記固定ローラおよび前記可動ローラが前記本体に対して内側となるように配置し、２個の前記固定ローラが互いに平行となるように対向して配置するベースと、
両端に前記腕部材を１個ずつ連結する連結部材とを備え、
前記ベースの中央部に第２のばね取付け部を固定し、
前記連結部材の中央部に前記第１のばね取付け部を配置し、
前記ばねは、一端を前記第１のばね取付け部に取り付けるとともに、他端を前記第２のばね取付け部に取り付けたことを特徴とするローラクランプ機構対。 The support shaft portion includes a main body, a fixed roller rotatably supported by the main body, a support shaft portion rotatably supported around the rotation shaft by the main body, and a revolving shaft that is eccentric with respect to the rotation shaft. A movable roller shaft provided with a movable roller support shaft portion arranged to be shifted in the axial direction with respect to the movable roller shaft, a movable roller supported on the movable roller support shaft portion so as to be rotatable about the revolution shaft, and one end of the movable roller shaft An arm member that engages with the arm member so as to rotate integrally therewith, and a spring that applies a tensile force to the arm member in a direction in which the movable roller approaches the fixed roller, and rotates the movable roller shaft around the rotation shaft. By revolving the movable roller, the relative position between the fixed roller and the movable roller is adjusted to grip the sheet material, and the eccentric direction of the movable roller support shaft portion with respect to the support shaft portion is the movable roller In a state in which the fixing roller is in contact, the roller clamp mechanism disposed in a direction substantially perpendicular to the straight line connecting the rotational center of the movable roller and the fixed roller,
Arranged so that the inner with respect to the fixed roller and the movable roller the body with placing the front Symbol roller clamp mechanism one by one at both ends, opposite to each other to the two said fixed roller are parallel to each other And the base to be placed
A connecting member for connecting the arm members one by one to both ends,
Fixing a second spring mounting portion to the central portion of the base;
Disposing the first spring mounting portion at the center of the connecting member;
A pair of roller clamp mechanisms , wherein one end of the spring is attached to the first spring attachment portion and the other end is attached to the second spring attachment portion .
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