JP2677660B2 - Method of placing a fabric of synthetic yarn around a cylinder while applying tension and a tensioning device for carrying out the method - Google Patents

Abstract

Process for installing, under tension, a cloth (1) around a surface (2): the cloth (1) is pretensioned around the surface and strips (14) are if necessary added to the ends (3) of the cloth (1), and the cloth (1) is joined up and the tension released. The tensioning device (5) has two straps (6) attachable to the ends (3) of the cloth and these are brought together by means of threaded rods (9) on which bolts (12) are screwed. <IMAGE>

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of placing a cloth of synthetic yarn under tension on a surface to be enclosed, such as the surface of a cylinder used particularly in the papermaking field.

The operation of placing a tubular cloth around a cylinder using tension is already known. In this case one end of the cylinder must be free to cover the cloth. This operation is complicated and time consuming, requires special equipment, and the environment around the cylinder must be adapted accordingly (eg with a cantilever).

It is also known to enclose a cylinder with a band-shaped woven cloth which is not closed in a tubular shape. In this case, a plurality of loops formed at both ends of the band-shaped cloth are connected by at least one rod so that the both ends of the cloth are connected to form a tubular shape.

If the warp and weft threads of the fabric are not at right angles to the axis of the cylinder, the fabric can be secured to the cylinder by pulling the fabric edge with a spring or brim secured to the cylinder edge.
If brims are used, the edges of the fabric are sandwiched between the brims on either side of the cylinder, and then screws secured to the brims are used to move the brims away from the edges of the cylinder. When the tensile stress is applied in this manner, the diameter of the cloth is reduced and the cloth sticks to the cylinder. This is a complicated and time consuming operation and special equipment must be provided on the rim of the cylinder.

If the warp and weft threads of the fabric are at right angles to the axis of the cylinder, it is preferable to use synthetic materials which can be fixed to the cylinder by heat shrinkage.

It is also known that a band-shaped cloth made of plastic spirals that occlude each other is wound around a cylinder, the spirals at both ends are occluded, and then locked with a rod to be closed into a tubular shape. These spirals are made of heat shrinkable plastic material. Therefore, the fixing of the cloth to the cylinder is performed by heat treatment. Hot air, steam, or high-temperature water is used for the operation of shrinking a plastic woven cloth or a cloth composed of a plurality of plastic spirals by heat.

This operation is also complicated because a heat source must be used. Further, the cloth is not always sufficiently fixed to the cylinder due to the contraction.

Further, there is a drawback that a yarn having a small shrinkage property or a yarn which does not shrink at all can not be used.

The method according to the invention for arranging a cloth made of synthetic yarn under the action of tension around the surface to be enclosed is simpler than the known art described above and uses a strip of cloth which comprises sustaining means at both ends. A plurality of trapping members are provided at regular intervals on both ends of the cloth. The length of this cloth is shorter than the surface to be enclosed.
In the method of the present invention, the cloth is wrapped around the surface to be surrounded in a sleeve shape, and a large pulling force is applied to the capturing member by using a pulling device so that both ends of the cloth are simultaneously brought close to each other across their widths. At each end, one or more strips of synthetic yarn having a narrow width but the same length as the width of the fabric and having loops on two edges are added, the loops of this strip being the loops at the tip of the fabric or Engage with the loops of adjacent strips to form a rod insertion locking passageway, insert the rod into the locking passageway, and then remove the tensioning device and capture member. It should be noted that the number of added strips is selected such that the desired tension is exerted on the sleeve and that the two loop rows at both ends of the sleeve engage each other to form a locking passage. To do.

One variation of the method of the present invention uses a synthetic yarn strip cloth that includes loops or spirals at both ends and has a plurality of strips at at least one end. The strips are narrow and have the same length as the width of the fabric, and have loops or spirals, which loops or spirals engage with the loops or spirals of adjacent strips for rod insertion. Forming a passage for use. A trapping member is fixed to each end of the cloth at regular intervals. In this method, the cloth is placed around the surface, and a pulling device is used to pull the catching member strongly to bring both ends of the cloth closer to each other, so that the cloth is subjected to a substantially desired tension to surround the surface. Remove one or more strips at one end of the fabric to have a length, engage loops at the top of the fabric with each other to form a locking passage, insert a rod into the locking passage and then pull. Remove the device and capture member.

In a second variant of the method according to the invention, the synthetic yarn is such that it comprises loops at both ends and the distance between these ends is gradually reduced according to the angle a from one side of the fabric to the other when it is placed. A strip of fabric is placed around the surface to be enclosed and the ends of the fabric are pulled close to each other by pulling strongly until the desired tension is reached, and then loops are made to approach each other according to the angle a, similar to the ends of the fabric. A synthetic yarn strip having two edges provided and having a length greater than the width of the fabric is brought into close proximity and the strip is moved between the ends of the fabric to completely fill the distance between the ends. , Engaging the loops on both ends of the fabric with the loops of the strip to form two locking passages and inserting rods into these locking passages,
Release the tension applied to the ends of the fabric and then cut the strip to the width of the fabric.

The method of this second variant is particularly easy to implement and requires only one strip regardless of the width of the cylinder to be coated.

The method of the present invention is primarily used when arranging a coating around one cylinder, but otherwise the cloth is wrapped around one surface which may consist of surfaces surrounding a plurality of parallel cylinders or members. It can also be used when placed in a taut condition.

In practicing the method of the invention, it is preferable to use a device which comprises two straps with two longitudinally rigid rods and a threaded rod arranged transversely between said rods. The threaded rods include bolts that are tightened to bring the longitudinal rods closer together. The straps are secured parallel to the longitudinal rods on a busbar near the tip of the fabric.

The device is extremely easy to use, especially easy to place and remove.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

The method (see FIG. 1) of the invention for arranging the synthetic thread cloth 1 around the cylinder 2 comprises the following steps. Here, a strip-shaped cloth 1 made of, for example, a woven cloth and having loop rows 4 at both ends 3 is used. On both ends 3 of this cloth 1, the end 13 of the strap 6 is parallel to the tip of the cloth by the manufacturer,
That is, it is sewn in parallel with the axis of the cylinder 2.

The user wraps the strip around the cylinder 2 to form a sleeve. The length of this band is shorter than the length of the peripheral edge of the cylinder, but the width is the same as the length of the cylinder 2.

The tensioning device 5 (see also FIG. 2) is attached to two flexible straps 6 having a width equal to or greater than the length of the cylinder.

To that end, two rigid metal rods 7 are arranged in the strap 6. Pin row 8 on these two rods 7
Has been fixed. The pin 8 of one rigid rod 7 has a threaded rod 9 orthogonal to the rod 7 in the strap 6.
One end of the rod 9 is fixed, and the other ends 10 of these rods 9 pass through the cavity 11 provided in the pin 8 of the other rod 7. Bolts 12 are provided at these ends 10.

When the bolts are tightened, the rigid rods 7 approach each other. In this way, while pulling the cloth 1 with a tension judged to be sufficient (preferably 50 kg / m or more), the cloth 1 having a length equal to the width of the cylinder 2 and having loops 15 at two edges 1
One or more synthetic thread strips 14 are brought together. The edge loops of these strips 14 are engaged with each other and rods 16 are inserted into the resulting passages 17 to connect the strips to each other and to the tip of the fabric in a similar manner (see FIG. 3). ). Use enough strips 14 to fill the distance between the ends 3 of the pulled fabric. If this distance is zero, then strip 14 need not be used.

Loosen the bolts 12 on the threaded rod 9 to relieve the tension exerted by the device 5 and then remove the strip 6. In this way, the cloth 1 is attached around the cylinder 2 in a taut state.

As a variant, instead of a cloth having a length smaller than the circumference of the cylinder 2, a cloth 1 having a length slightly larger than said circumference can be used.

The fabric 1 supplied by the manufacturer already has two strips 6 fixed to each end of the fabric 1. The strip 6 may consist of two parts 6 ', 6 "which are connected to each other by locking means 34 (sliding closure rods) (see Figure 8), in which case only part 6'is the manufacturer. It is fastened to the end of the cloth 1 by means of the user joining the part 6 ″ to the part 6 ′. Once assembled, the pulling device 5 can be removed and used for another fabric placement.

In the embodiment shown in FIG. 4, the cloth 1 is composed of a plurality of bands 20 of spirals 22 connected to each other by rods 21.

Also in this specific example, the same pulling device 5 as in the case of FIG. 1 is used. However, the edge of each strip 6 opposite the rigid rod is provided with a rigid loop 23. A portion of these rigid loops extend through the spiral 22 at each tip 18 of the fabric 1 along a generatrix parallel to the axis of the cylinder 2. These loops 23 are fixed in the spiral 20 by the manufacturer by introducing a piano wire 24. The rigid loop 23 may be a loop formed with the weft thread of the strap, a spiral held by the thread of the strap, or a metal hook fixed to the edge. These loops 23 are then fixed to the strap 6.

The bolts 12 of the threaded rod 9 are then tightened to bring the rigid rods closer together until the desired tension is achieved.

The extra length of cloth 1 is cut by removing an appropriate number of strips 20 of spirals 22. The length between the two generatrixes of the cloth 1 under tension is such that one end of the spiral is occluded with the other end to form a locking passage 26 in which the rod 21
The cloth 1 is made to have a length suitable for tubular closing by inserting (Fig. 5).

Then, loosen the bolt 12 of the threaded rod 9 to relieve the tension, then remove the piano wire 24 to remove the strap 6
Remove.

In yet another variation of the method of the present invention shown in FIG.
When the cloth 1 of synthetic yarn is wound around the cylinder 2, the cloth 1 is used such that an acute angle a is formed between both ends 27.

Loops 26 are provided at both ends of the cloth. The cloth 1 is pre-pulled on the cylinder 2 using the pulling device (not shown in FIG. 6) until the desired tension is obtained.
Then, a narrow strip 29 is arranged which is provided with loops 31 on both ends and forms the same angle between the ends 27 of the fabric 1 as one another.

Move the strip 29 so that the gap between the two ends 27 of the fabric is exactly filled. The loops 31 of the strip 29 are then engaged with the loops 28 on both ends 27 of the fabric to form two locking passages, into which two locking rods 32 are inserted.

Remove the tensioning device and cut the strip to the width of the cylinder.

The various cloth arranging methods described above can also be used for arranging the cloth 1 around one surface regulated by a plurality of cylinders 33 having axes parallel to each other as shown in FIG. 7, for example.

In the embodiment of FIG. 6, instead of the loops present at the edges of the cloth or intermediate strip, spirals, hooks or more generally to engage each other to form a locking passage for inserting the rod. Any suitable connecting means may be used.

In various placement methods described herein, the capture member 6,
It is particularly advantageous to fix the 23,6 'parallel to the edge of the fabric by the hand of the manufacturer. In this way, the user need only perform the operation of placing the tensioning device 5 and the operation of removing or adding the strip. Any of these operations can be performed very easily.

[Brief description of the drawings]

1, 2 and 3 are explanatory views showing a method of arranging cloth around a cylinder according to the present invention, FIGS. 4 and 5
FIG. 4 is an explanatory view showing a method of arranging cloth according to a modification of the present invention, FIGS. 4 and 5 are explanatory views showing a method of arranging cloth according to a modification of the present invention, and FIG. FIG. 7 is an explanatory view showing another modified example of the arrangement method of FIG. 7, FIG. 7 is an explanatory view showing the cloth arranged around a plurality of cylinders, and FIG. 8 is an explanation showing yet another modified example of the arrangement method of the present invention. It is a figure. 1 ... cloth, 2 ... surface to be surrounded, 5 ... pulling device,
6 ... Strap, 14 ... Strip.

Claims (5)

(57) [Claims] 1. A method of arranging a cloth made of synthetic yarn under the action of tension around the surface of a cylinder or a surface to be enclosed which is one surface defined by a plurality of cylinders parallel to each other, the method being tubular. Use a non-closed strip of cloth, which contains loops at both ends, along which the multiple capture members are fixed at regular intervals, the length of the cloth being shorter than the surface to be enclosed. The cloth is wrapped around the surface to be enclosed in a sleeve shape, and a large pulling force is applied to the capturing member by using a pulling device so that both ends of the cloth are brought close to each other at the same time, and the width is narrow but long. The width is the same as the width of the fabric and one or more strips of synthetic yarn with loops at two edges are added to both ends of the fabric, the number of such strips being such that the desired tension is exerted on the sleeve. And Two loops columns at both ends of the serial sleeve chosen so as to form a engaging locking passages with each other,
Engaging the loops of this strip with the loops of the leading edge of the fabric or the loops of the adjacent strip to form a rod insertion locking channel into which the rod is inserted, after which the tensioning device and the capture member are removed. A method characterized by. 2. A method for arranging a cloth made of synthetic yarn under the action of tension around the surface of a cylinder or a surface to be enclosed which is one surface defined by a plurality of cylinders parallel to each other. A strip-shaped cloth containing loops or spirals is used for the cloth, and the capturing members are fixed to the both ends at regular intervals along a generatrix parallel to the both ends of the cloth. These strips, including manufactured strips, are equal in length to the width of the fabric and have loops or spirals that engage loops or spirals on adjacent strips and are connected by rods. And placing the cloth in a sleeve around the surface,
A pulling device pulls strongly on the capture members to bring the busbars to which they are secured close to each other so that the fabric has a length that is just sufficient to enclose the surface under approximately the desired tension. Remove one or more strips at one end of the fabric and engage the loops or spirals at the tip of the fabric with each other to form a locking channel, insert a rod into the locking channel and then insert the capture member and tensioning device. A method characterized by removing. 3. A method of placing a cloth of synthetic yarn under tension on a surface of a cylinder or around a surface to be enclosed, which is one surface defined by a plurality of cylinders parallel to one another. Use a strip of cloth with loops on both ends,
When this cloth is placed, the distance between both ends gradually decreases from one side of the cloth to the other according to the angle a. The cloth is arranged in a sleeve shape around the surface to be surrounded, Tightly pulling near each end until the desired tension is reached to bring the ends closer together, and then a strip of synthetic yarn having a length greater than the width of the fabric is brought close, the strip having two edges with loops. The edges of the cloth are made to approach each other according to the angle a and the strip is moved between the ends of the cloth to completely fill the distance between the two ends of the cloth. Engage the loops on both ends of the strip with the loops of the strip to form two locking passages, insert rods into these locking passages,
A method, characterized in that the tension applied to both ends of the fabric is released and then the strip is cut to the width of the fabric. 4. A pulling device for carrying out the method according to any one of claims 1 to 3, comprising two straps with two longitudinal rigid rods and said rigid rods. A threaded rod arranged in a transverse direction, the threaded rod being provided with a bolt, the tightening of the bolt bringing one longitudinal rod closer to the other longitudinal rod, the strap being provided at both ends of the fabric. An apparatus adapted to be temporarily fixed parallel to the longitudinal rod along a generatrix in the vicinity of the. 5. The method of claim 1 wherein each strap comprises two parts joined together by locking means, a first part secured to the cloth and a second part comprising the rigid rod. The tensioning device according to claim 4.