JP5694084B2 - Clip and tenter device using the same - Google Patents

Description

  The present invention relates to a clip for gripping a web such as a film, fabric, or paper, and a tenter device using the clip.

  Conventionally, a plurality of clips that support both ears of the web, a tenter chain that connects the clips, and a tenter rail that runs the clips connected by the tenter chain, and the tenter chain runs on the tenter rail. Has proposed a tenter device for running a web gripped by a clip (see, for example, Patent Documents 1 and 2).

JP-A-5-319648 JP 2010-247393 A

  In the tenter device as described above, when the film is run, both ears of the web may curl inward. When the curled web is sandwiched between conventional clips (for example, a clip described in Patent Document 2), there is a problem that the curled portion cannot be sandwiched between the clips.

  The reason is that in the conventional clip, the upper gripping portion rotates from the outer side to the inner side of the ear portion of the web, and both ear portions are gripped by the lower gripping portion. However, when the upper gripping portion rotates from the outside to the inside of the web, the curled portion is caught and the web is not pinched.

  SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a clip that can reliably grip a web with curled ears and a tenter device using the clip.

The present invention relates to a clip used in a tenter device for gripping a web, a base, a lower gripping portion for gripping the web provided at a front portion of the base, and the base Between the pair of left and right support legs erected from the rear, the pair of left and right support arms protruding forward from the pair of left and right support legs, and the pair of left and right support arms, the first shaft A rotating part attached rotatably by the part, a swinging part protruding downward from the rotating part,
An upper gripping portion that is rotatably attached to the swinging portion via a second shaft portion and that grips the web together with the lower gripping portion, and a first shaft portion of the pair of left and right support arm portions. A third shaft portion provided at the rear, a fourth shaft portion provided at the rear of the second shaft portion in the upper gripping portion, and attached between the third shaft portion and the fourth shaft portion. And a link portion.

  According to the present invention, even a web with curled ears can be reliably gripped.

It is a perspective view of the clip of one embodiment of the present invention. It is a side view of the clip of a holding state. It is a side view of the clip in a separated state. It is a front view of a clip. It is a top view of a clip. It is a figure which shows the link mechanism of a clip. It is a top view of a tenter device.

  Hereinafter, a clip 10 showing an embodiment of the present invention and a tenter device 100 using a plurality of clips 10 will be described with reference to FIGS.

(1) Configuration of Tenter Device 100 First, the configuration of the tenter device 100 will be described with reference to FIG. The tenter device 100 of the present embodiment is a clip tenter device.

  In the tenter device 100, a pair of left and right endless tenter chains 106 are wound around drive wheels 102 and 104, respectively. A clip 10 is attached to each tenter chain 106 at predetermined intervals. The pair of left and right tenter chains 106 to which the clip 10 is attached run on the tenter rail 108.

  The tenter rail 108 is disposed inside the heat treatment chamber 110 for heat treating the web.

  The tenter device 100 grips the web W (for example, a film, fabric, paper, etc.) with a certain tension in the width direction by a plurality of clips 10 attached to a pair of left and right tenter chains 106, and the inside of the heat treatment chamber 110 Is passed at a constant conveying speed to heat-treat the web W.

(2) Structure of Clip 10 Next, the structure of the clip 10 will be described with reference to FIGS.

  The clip 10 is made of metal and includes a clip main body 12, a rotating portion 14, an upper gripping portion 16, a pair of left and right link portions 18 and 18, and an urging portion 20.

  The clip body 12 includes a plate-shaped base 22, a lower grip 24 provided along the front portion of the base 22, and a pair of left and right support legs 26 and 26 erected from the rear end of the base 22. The pair of left and right support leg portions 26, 26 project from the pair of left and right support arm portions 28, 28, respectively. As shown in FIGS. 2 and 3, the clip main body 12 is configured in a U shape by a base 22, support leg portions 26, and support arm portions 28 when viewed from the side.

  The upper surface of the lower grip portion 24 is flat, and this upper surface is a lower grip surface for gripping the web W.

  Between the pair of left and right support arm portions 28, 28, the rotating portion 14 is rotatably attached via a horizontal first shaft portion 30. From the center of the lower surface of the rotating part 14, the swinging part 32 protrudes downward. An operation lever 34 protrudes upward from the center of the upper surface of the rotating portion 14. A pair of left and right bearing portions 36, 36 protrude from the rear surface of the rotating portion 14. The rotating portion 14, the swinging portion 32, the operation lever 34, and the bearing portions 36, 36 are integrally formed.

  A second shaft portion 38 is horizontally attached to the lower end of the swinging portion 32 of the rotating portion 14, and the upper gripping portion 16 is rotatably attached via the second shaft portion 38.

  The upper gripping portion 16 is composed of an upper gripping body 40 for contacting the lower gripping portion 24 and gripping the web W, and a pair of left and right two bearing portions 42, 42 protruding upward from the upper surface of the upper gripping main body 40. Has been. The second shaft portion 38 is rotatably attached to the front portion of the two bearing portion 42. The lower surface of the upper grip body 40 is the upper grip surface.

  A third shaft portion 44 is horizontally provided at a position behind the first shaft portion 30 in the support arm portion 28. The fourth shaft portion 46 is horizontally provided at a position behind the second shaft portion 38 in the two bearing portions 42 of the upper gripping portion 16. A plate-like link portion 48 is attached between the third shaft portion 44 and the fourth shaft portion 46.

  An urging portion 20 is attached between the pair of left and right support arm portions 28 and 28 at a position behind the rotating portion 14. The urging portion 20 includes a cylindrical tubular body 50 and a coiled compression spring 52 inserted into the tubular body 50, and a fifth shaft portion 54 is provided at the front end of the tubular body 50. The bearings 36 and 36 of the pivoting part 14 are horizontally mounted so as to be pivotable. A pair of left and right cutouts 56, 56 whose rear end portions are open are provided at the rear portion of the cylindrical body 50, and a sixth shaft portion 58 is horizontally arranged along the cutouts 56 so as to be movable. The left and right end portions of the sixth shaft portion 58 are attached to a pair of left and right support arm portions 28 and 28. The coiled compression spring 52 is disposed between the fifth shaft portion 54 and the sixth shaft portion 58 inside the cylindrical body 50, and biased so that the fifth shaft portion 54 and the sixth shaft portion 58 are separated from each other. doing.

(3) Operation State of Clip 10 Next, the operation state of the clip 10 will be described with reference to FIGS. 2, 3, and 6.

  2 shows a state in which the upper gripping portion 16 and the lower gripping portion 24 grip the web W, FIG. 3 shows a state in which the upper gripping portion 16 and the lower gripping portion 24 open the web W, and FIG. Shows a simplified state in which the upper gripping portion 16 and the lower gripping portion 24 grip the web W.

  In the following description, the center of the first shaft portion 30 is the first fulcrum S1, the center of the second shaft portion 38 is the second fulcrum S2, the center of the third shaft portion 44 is the third fulcrum S3, and the fourth shaft portion. The center of 46 is described as the fourth fulcrum S4. Further, “PE” in the drawing indicates a gripping force point located at the rear end portion of the upper gripping portion 16, and “PS” indicates a locking point that is the front end portion of the upper gripping portion 16. Further, in FIG. 3, the locus of movement of the gripping force point PE of the upper gripping part 16 accompanying the pivoting of the pivoting part 14 is also shown.

  Since the support arm portion 28, the turning portion 14, the upper gripping portion 16, and the link portion 48 constitute a four-node link, when the operation lever 34 is operated and the turning portion 14 is turned, the link portion 48 is moved. Then, the upper gripping portion 16 is rotated around the second fulcrum S2. The upper gripping portion 16 is gripped or separated from the lower gripping portion 24 substantially vertically as indicated by the locus of the gripping force point PE. The operation lever 34 of the clip 10 is operated by a lever operation unit (not shown) provided in the tenter device 100.

  As shown in FIG. 6, in the gripping state of the web W, the second fulcrum S2 is located slightly ahead of the straight line connecting the first fulcrum S1 and the gripping force point PE. The fourth fulcrum S4 is located slightly behind the straight line connecting the third fulcrum S3 and the locking point PS. In this state, a horizontal tension F acts on the web W, pulls the upper gripping portion 16 toward the inner side in the horizontal direction of the fourth fulcrum S4, and the upper gripping portion 16 rotates to rotate the rotating portion. Suppose that it acted so that 14 may be rotated to the outside of a horizontal direction. Since the support arm portion 28, the rotating portion 14, the upper gripping portion 16, and the link portion 48 constitute a four-node link as described above, in order to rotate the rotating portion 14 outward in the horizontal direction. The upper gripping portion 16 needs to be rotated outward in the horizontal direction around the second fulcrum S2. However, since the second fulcrum S2 is positioned in front of the straight line connecting the first fulcrum S1 and the gripping force point PE, in order to rotate the upper gripping portion 16 outward in the horizontal direction, Once the angle θ1 is increased, the gripping force point PE is moved away from the first fulcrum S1. That is, the gripping force point PE is pressed against the lower gripping portion 24 by the tension F of the web W, and the frictional force on the web W between the upper gripping portion 16 and the lower gripping portion 24 is increased while preventing the upper gripping portion 16 from rotating. And can be gripped more strongly than the web W.

  Further, the reaction force received by the gripping force point PE from the lower gripping portion 24 generates a force that rotates the swinging portion 32 of the rotating portion 14 outward in the horizontal direction. However, since the fourth fulcrum S4 is located behind the straight line connecting the third fulcrum S3 and the locking point PS, once the swinging portion 32 is rotated outward in the horizontal direction, the angle θ2 is once set. And the locking point PS is pressed against the lower grip 24. That is, the locking point PS functions as a stopper that determines the horizontal front end of the rotation range of the swinging portion 32. Accordingly, the clip 10 can grip the web W in a state where the gripping force point PE exhibits a sufficient gripping force with respect to the lower gripping portion 24.

  Thus, the web W cannot rotate the swinging portion 32 outward in the horizontal direction by the tension F. However, since the operating lever 34 directly exerts a force in the direction in which the rotating unit 14 is rotated, the angle θ2 is once increased so that the first fulcrum S1, the second fulcrum S2, and the gripping force point PE are aligned on a straight line. Thus, the upper gripping portion 16 and the lower gripping portion 24 can be separated from each other.

  Further, when the upper gripping portion 16 and the lower gripping portion 24 are in the gripping state, the cylindrical body 50 is positioned below the fifth shaft portion 54 as shown in FIG. The holding state can be maintained by the biasing force of the compression spring 52.

  On the other hand, when the upper gripping portion 16 and the lower gripping portion 24 are in the separated state, the fourth shaft portion 46 of the cylindrical body 50 is positioned above the fifth shaft portion 54 as shown in FIG. The separated state can be maintained by the biasing force of the compression spring 52.

  As described above, when the upper gripping portion 16 of the clip 10 grips the web W, the gripping force point PE moves downward substantially vertically to grip the web W. Therefore, even if both ear portions of the web W are curled inward as shown in FIG. 3, the web W can be reliably gripped without the upper gripping portion 16 coming into contact with the curled portion.

(4) Effect As described above, the clip according to the present embodiment can be reliably gripped and separated even if the web W has curled ears. Therefore, the web W cannot be pinched unlike the conventional clip.

(5) Modification Examples Although one embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... Clip, 12 ... Clip main body, 14 ... Turning part, 16 ... Upper grip part, 18 ... Link part, 20 ... Biasing part, 22 ... Base 24 ... Lower gripping part, 26 ... Supporting leg part, 28 ... Supporting arm part, 30 ... First shaft part, 32 ... Swing part, 34 ... Operating lever, 36 ... Bearing part, 38 ... Second shaft part, 40 ... Upper gripping body, 42 ... Bearing part, 44 ... Third shaft part, 46 ... Fourth shaft part, ..Cylinder, 52 ... Compression spring, 100 ... Tenter device

Claims (8)

A clip used in a tenter device to grip a web,
The base,
A lower grip for gripping the web provided at the front of the base;
A pair of left and right support legs standing from the rear of the base;
A pair of left and right support arm portions respectively protruding forward from the pair of left and right support leg portions;
A rotating part rotatably attached by a first shaft part between the pair of left and right support arm parts;
A swinging part projecting downward from the turning part;
An upper gripping part that is rotatably attached to the swinging part via a second shaft part, and that grips the web together with the lower gripping part;
A third shaft portion provided respectively behind the first shaft portion in the pair of left and right support arm portions;
A fourth shaft portion provided behind the second shaft portion in the upper gripping portion;
A link portion attached between the third shaft portion and the fourth shaft portion;
A clip characterized by comprising: When the upper gripping portion and the lower gripping portion are gripped, the center of the second shaft portion is a straight line connecting the gripping force point at the rear end of the gripping surface of the upper gripping portion and the center of the first shaft portion. Also located forward,
The clip according to claim 1. In the gripping state between the lower gripper and the upper gripper, the center of the fourth shaft portion, the straight line connecting the center of the third shaft portion and the engagement point of the front end of the gripping surface of the upper gripping part Located behind,
The clip according to claim 1 or 2, wherein The upper gripping portion has an upper gripping body that comes into contact with the gripping surface of the lower gripping portion, and a pair of left and right two-bearing portions that protrude from the upper portion of the upper gripping body,
The second shaft portion and the fourth shaft portion are respectively attached to the pair of left and right two bearing portions.
The clip according to any one of claims 2 and 3, characterized in that: A biasing portion that biases the upper gripping portion and the lower gripping portion into a gripping state;
The clip according to any one of claims 2 to 4, wherein the clip is provided. An operation lever for rotating the rotating part protrudes upward from the rotating part.
The clip according to any one of claims 2 to 5, wherein the clip is provided. Both the gripping surface of the upper gripping part and the gripping surface of the lower gripping part are flat surfaces.
The clip according to any one of claims 2 to 6, wherein the clip is provided. A pair of endless tenter chains respectively arranged on both sides of the web conveyance path;
The clip according to claim 1 attached to the pair of tenter chains at predetermined intervals,
A tenter device characterized by comprising:

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