JPH0726390Y2 - Widening device for reticulated web - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a widening device for a continuous reticulated web such as a split fiber web obtained by splitting a stretched plastic film.

[Conventional technology]

Conventionally, as this type of reticulated web widening device, for example,
Those disclosed in Japanese Examined Patent Publication No. 46-43275 or Japanese Unexamined Patent Publication No. 48-67557 are known. In these devices, an unexpanded reticulated web is placed on the outward path of a circuit that circulates with the forward route widening toward the end and the return route narrowing toward the end. The width of the circuit at the position where the web is supplied and the position where the widened reticulated web is separated from the circuit are constant and cannot be changed.

[Problems to be solved by the device]

In the conventional web widening device described above, since the width of the circuit is constant at the supply position on the unwidened reticulated web circuit and the position where the widened reticulated web is separated from the circuit, the expansion ratio of the reticulated web is increased by the device. It was fixed for each. Therefore, in order to obtain several kinds of reticulated webs widened at different magnifications, it is necessary to prepare as many devices as the number of desired widening magnifications, which is also disadvantageous in terms of cost.

It is an object of the present invention to overcome the above-mentioned problems and to provide a reticulated web widening device capable of widening reticulated webs having various magnifications with a single device.

[Means for Solving the Problems]

Means of the present invention for solving the above problems will be described with reference to the accompanying drawings.Specific examples will be described below for supporting an unexpanded continuous reticulated web 16a and expanding it to a target width while traveling in the longitudinal direction. Circulation circuit 2 and continuous cam track 9,9 ',
That is, a circulation circuit (2): a straight core rod (3) penetrates inside, and a large number of coil springs (4) which are expandable and contractable are arranged in parallel with each other in a substantially cylindrical shape, and the shaft (6) of the cylinder is ), The coil springs (4) group gradually expands in a predetermined rotation angle range to form an outward divergent path in accordance with the rotation, and gradually contracts and narrows in another predetermined rotation angle range. What forms the return path, continuous cam tracks (9,9 '): A pair of continuous cam tracks (9,9) fixed to a non-rotating cylindrical frame (8) provided inside the circulation circuit (2). ') And guides the left and right ends of the coil springs (4) when they rotate, and the distance between the tracks (hence the width of the circulation circuit (2)) gradually increases in the forward path of the circulation circuit (2). And then gradually on the return trip of the circulation circuit (2) And the reticulated web supply roller (12) that supplies the unexpanded reticulated web (16a) to the circulation circuit (2) and the reticulated web (16b) that has been widened from the circulation circuit (2). In a widening device (1) having a reticulated web take-up roller (13), a reticulated web is widened on a shaft (6) of a cylindrical frame body (8) having a fixed continuous cam track (9, 9 '). It is configured such that it can be rotated by a desired angle before being fixed in the state after nuclear rotation, and can be maintained in the fixed state after nuclear rotation when the reticulated web is widened. By doing so, the circulation circuit (2) at the position (F) where the unwidened reticulated web (16a) is supplied to the circulation circuit (2) according to the desired widening ratio of the reticulated web to be widened.
It is possible to change the ratio (that is, the expansion ratio) of the widened reticulated web (16b) to the width (t) of the circulation circuit (2) at the position (T) separated from the circulation circuit (2). It has become possible.

In order to be able to rotate and fix the cylindrical frame (8) about its axis (6) by a desired angle, for example, a worm wheel is attached to the shaft end of the shaft (6) and driven by a worm. Good.

[Action]

Since the device of the present invention is configured as described above,
A half circuit of the circulation circuit (2) is set as a forward path (180 ° C) and another half circuit is set as a return path (180 ° C), and the width of the circulation circuit (2) is increased / decreased at a constant rate. Assuming that the widening web (16a) can be widened to four times the original width, the width of the circulation circuit (2) becomes the width at the starting point of the forward path every time the circulation circuit (2) rotates 60 °. Increase / decrease by equal width (increase on the outbound route, decrease on the return route)
Will be done. Therefore, in this apparatus, the fixed cylindrical frame body (8) of the continuous cam track (9, 9 ') is set at 60 ° in the clockwise direction in FIG. 3 with reference to the position of the reticulated web supply roller (12). If the displacement can be fixed at any of the following angles (θ), the width of the circulation circuit (2) determined by the interval between the continuous cam tracks (9, 9 ') is 60 ° in the case of displacement. , (F) is twice the width of the starting point of the forward path, so if the web is taken out from the continuous cam track at the maximum widening position (T ′), the widening ratio becomes 4/2 = 2 times. Therefore, if this device is used, the reticulated web can be widened at any magnification between 2 and 4, and a different device is not required for each different widening magnification.

〔Example〕

 Next, the present invention will be described by way of examples with reference to the drawings.

FIG. 1 is a vertical sectional view of an embodiment of the present invention, FIG. 2 is a partial detailed view of the same embodiment, FIG. 3 is a horizontal sectional view taken along the line III-III 'of FIG. 1, and FIG. FIG. 3 is a development view conceptually showing the circulation circuit 2 in a state where the web 16 is widened,
(A) is the case of 4 times widening (t / f = 4), (b) is the case of 2 times (t / f = 2). In these figures, the circulation circuit 2 of the reticulated web widening device 1 has a large number of coil springs 4 through which a mandrel 3 penetrates and are arranged substantially parallel to each other in a substantially cylindrical shape.
Both ends of each mandrel 3 are fixed to two discs 5 and 5'on the left and right to form a cage-shaped roller, and two sprocket wheels 7 and 7 on the left and right are provided around a fixed shaft 6 parallel to each mandrel 3. It is rotated by '. Inside the circulation circuit 2, a cylindrical frame body 8 having a circular cross section is provided.
Are fixedly provided on the fixed shaft 6, and left and right continuous cam tracks 9 and 9'are fixedly provided at both ends of the cylindrical frame body 8 of the stoppers 10 and 10 'attached to both ends of each coil spring 4. The foot 11 is slidably engaged with the continuous cam tracks 9 and 9'and guided along the continuous cam tracks 9 and 9 '. In the device of this embodiment, the spacing between the continuous cam tracks 9, 9 '(hence the width of the circulation circuit 2).
Is the minimum (n) at the N point of the orbit, and is 18 from the N point.
It is 4 times (4n) at the W point rotated by 0 ° C, and at a constant ratio between the N point and the W point and between the W point and the N point (0.25n for every 15 ° rotation).
Each) I increased or decreased.

An unexpanded reticulated web feed roller 12 is arranged above the circulation circuit 2 in parallel with the fixed shaft 6, and an expanded reticulated web take-up roller 13 is arranged below the circulation circuit 2 in parallel with the fixed shaft 6. It

The axis 6 of the cylindrical frame 8 is 60 in the clockwise direction in FIG.
It was made possible to rotate and fix at any angle within the range of °. As a result, the continuous cam tracks 9 and 9 ′ fixed to the cylindrical frame body 8 can also be rotationally fixed together with the cylindrical frame body 8 within the above range of angles.

Since the widening device of this embodiment is configured as described above, the reticulated web can be widened to any width between 2 and 4 times its original width. With this device, the angle θ (the angle in the clockwise direction in FIG. 3) at which the cylindrical frame 8 should be rotated in order to widen at a predetermined magnification m (m = width after widening / width before widening) is as follows. Calculated by the formula.

Therefore, when the widening magnification m is 2 times and 3 times, θ is 60 ° and 20 °, respectively.

The widening of the reticulated web 16 by the widening device 1 will be described. The unwidened reticulated web 16 is supplied to the circulation circuit 2 via the reticulated web supply roller 12 at the point F as shown by the arrow P, and the circulation circuit 2 The coil spring 4 is engaged with the coil spring 4 and is widened while being conveyed on the coil spring 4. Then, the coil roller 4 is separated from the circulation circuit 2 at the point T by the drawing roller 13 and taken as indicated by an arrow R. The reticulated web 16 is expanded by the ratio of the width of the circulation circuit 2 at those points between the FTs due to the expansion and contraction of the coil spring 4 that conveys it. In order to increase the expansion ratio of the reticulated web 16 by this device, for example, the cylindrical frame 8 is displaced around the fixed shaft 6 clockwise by 60 ° in FIG. 3rd from the position where N and the maximum point W coincide with the F point and the T point, respectively.
Change to N'and W'in the positions shown. As a result, the reticulated web 16a supplied from the point F of the circulation circuit 2 is widened and taken up by the take-off roller 13 separated from the circulation circuit 2 at T'corresponding to W '. Also, the supply roll 12,
The take-up roll 13 can be arbitrarily widened by moving it to the position of 12a or 13a.

[Effect of device]

As described above, the present invention is capable of widening a reticulated web at an arbitrary magnification within a certain range by one widening device, and thus, a plurality of devices having different widening magnifications can be provided. It is unnecessary and very economical.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a partial detailed view of the same embodiment, FIG. 3 is a transverse sectional view taken along the line III-III 'of FIG. 1, and FIG. 7A and 7B are development views showing the circulation circuit 2 during the expansion of the reticulated webs 16 and 16 'having the same original width at different expansion ratios. 1 ... Reticulated web widening device, 2 ... Circulation circuit, 3 ... Mandrel, 4 ... Coil spring, 5,5 '... Disc, 6 ... Fixed shaft, 7,7' ... Sprocket wheel, 8 ... …drum.

Claims (1)

[Scope of utility model registration request] 1. A device for expanding a continuous reticulated web (16) to a target width while running in the longitudinal direction thereof, which comprises a next circulation circuit (2) and a continuous cam track (9, 9 '), that is, (i). ) Circulation circuit (2): A large number of coil springs (4) that extend through the linear core rod (3) and are expandable.
Are arranged in parallel to each other in a substantially cylindrical shape, and are rotated around an axis (6) of the cylinder, and the coil springs (4) group are gradually extended within a predetermined rotation angle range according to the rotation to form a divergent outward path. However, in other predetermined rotation angle range, it gradually shrinks to form a narrowing return path, (ii) continuous cam track (9, 9 '): a non-rotating cylinder provided inside the circulation circuit (2) A pair of continuous cam tracks (9, 9 ') fixed to the frame body (8), which guide the left and right ends of the coil springs (4) when they rotate,
The distance between the orbits is gradually increased on the outward path of the circulation circuit (2) and gradually decreased on the return path of the circulation circuit (2), and (iii) the unwidened reticulated web (16a) is supplied to the circulation circuit (2). Reticulated web supply roller (12), and (iv) reticulated web (16) widened from circulation circuit (2)
In a widening device (1) having a reticulated web take-up roller (13) for taking apart and taking out b), a cylindrical frame body (8) having a fixed continuous cam track (9, 9 ').
The shaft (6) is configured so that it can be rotated by a desired angle and fixed in the state after the rotation before widening the reticulated web, and when expanding the reticulated web, the fixed state after the rotation is set. Due to the structure that can be maintained, the circulation circuit (at the position (F) at which the unwidened web (16a) is supplied to the circulation circuit (2) in accordance with the desired widening ratio of the web to be widened ( The width (f) of 2) and the width (t) of the circulation circuit (2) at the position (T) at which the widened web (16b) is separated from the circulation circuit (2) are changed, with respect to (f). A reticulated web widening device capable of changing a reticulation web widening ratio which is a ratio of (t).