JPH0555628B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for removing weft yarns from a blind fabric constructed by entwining a large number of parallel warp yarns with weft yarns separated from each other by a predetermined distance in the longitudinal direction.

Conventional technology Generally, processed yarn is made by treating single yarn or twisted yarn with resin.
It is manufactured through paraffin treatment, adhesive treatment, and heat treatment, either alone or in combination, and is widely used for household use and industrial materials.
For example, in the tire industry, textured yarns such as those described above are used as cords to reinforce plies. In order to improve production efficiency, the processed yarn used in such reinforcing cords is used in the form of a blind fabric, which is made up of multiple thick warp yarns intertwined with thin weft yarns that act as a connector. However, if such a blind fabric is used as a reinforcing cord as it is, the weft threads will remain in the tire, and the warp threads will rub against each other while the tire is running, causing the warp threads to wear out and deteriorate the performance of the tire. Or, during ply manufacturing, the warp yarns may become unevenly arranged due to the influence of the weft yarns.
There is a problem in that the coating rubber must be thick in order to secure the gauge between the plies. In order to solve these problems, an apparatus for removing weft yarns from blind fabrics has been proposed, for example, as described in Japanese Patent Application Laid-open No. 52-63459. In this method, a large number of cutters are placed between the warp yarns to separate the weft yarns while the blind fabric is moving, and immediately after these cutters, the warp yarns existing between the cutters are alternately cut up and down, that is, at right angles to the longitudinal direction of the warp yarns. A separator is disposed to loosen the binding force between the weft and warp yarns that are separated in both directions, and a brush roller is installed behind the separator to brush off the divided weft yarns.

However, such weft removal devices alternately separate the warp yarns vertically at the same time or immediately after the separation to separate the weft pieces from the warp yarns, but blind fabrics for tires do not adhere to the coating rubber. Since the date ping process is applied to improve the elasticity, the warp and weft threads are glued together at their overlapping parts using glue, etc., and as a result, when separated as described above, the separated weft threads There is a problem in that the warp threads are not completely separated from the vertically separated warp threads and remain attached to either one of the warp threads, resulting in them remaining in the tire.

Problems to be Solved by the Invention The present invention solves the conventional problem that the weft yarn cannot be completely separated from the warp yarn, so the weft yarn remains attached to the warp yarn in the tire.

Means for Solving the Problems These problems are solved by a device for removing weft threads from a blind fabric made of a large number of parallel warp threads intertwined with weft threads separated by a predetermined distance in the longitudinal direction. A shifting means for applying an external force in the longitudinal direction of the warp over the entire length to slightly shift the entire weft in the longitudinal direction of the warp with respect to the warp, and a shifting means installed downstream of the shifting means to divide the shifted weft into a plurality of pieces. This can be solved by providing a dividing means and a separating means installed downstream of the dividing means to separate the weft yarn divided into a plurality of pieces from the warp yarn.

Action: First, an external force is applied to each weft over its entire length by the shifting means. Here, since the direction of this external force is the longitudinal direction of the warp, the weft as a whole moves parallel to the longitudinal direction of the warp with almost no change in attitude, and its relative position with respect to the warp is slightly shifted. As a result, even if the overlapping portions of the warp and weft of the blind fabric are bonded, all bonded portions are reliably separated. Next, the weft yarn separated from the warp yarn in this manner is divided into a plurality of pieces in the longitudinal direction by a dividing means. Next, the weft yarn thus divided into a plurality of small yarn pieces is separated from the warp yarn by a separating means. In this way, the weft is completely separated from the warp by the shifting means, and then the weft is divided into a plurality of pieces one after another by the dividing means, so the weft can be reliably removed from the warp without cutting the weft. be able to.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings.

In Figures 1 and 2, numeral 1 denotes a blind fabric running in the direction of arrow A, and this blind fabric 1 has a large number of parallel thick warp threads 2, and these warp threads 2 are spaced at predetermined intervals in the longitudinal direction of the warp threads 2. It is composed of thin weft yarns 3 that are entwined. Since this blind fabric 1 has been subjected to dipping treatment in the previous step, the warp yarns 2 and weft yarns 3 are joined together with glue or the like at the overlapping portions. 5 is a shifting means,
This shifting means 5 includes a roller 6 parallel to the weft thread 3.
2, a large number of protrusions 7 formed on the outer peripheral surface of the roller 6, and a motor 8 for rotating the roller 6 in the direction of arrow B in FIG. As shown in FIG. 3, each protrusion 7 has a rounded tip so as not to damage the warp threads 2, and is made of a material such as metal. The height of the protrusion 7 is preferably slightly higher than the diameter of the warp thread 2, since the weft thread 3 connected to the warp thread 2 is hooked thereon. Further, the roller 6 is rotated in the direction of sending out the blind fabric 1 in the direction of arrow A by the operation of the motor 8, but at this time, the circumferential speed of the roller 6 is faster than the running speed of the blind fabric 1. Therefore, the protrusion 7 hooks the weft thread 3 and applies an external force to the weft thread 3 over its entire length. Here, since the direction of this external force is the longitudinal direction of the warp threads 2, the weft threads 3 as a whole move in parallel in the longitudinal direction of the warp threads 2 with almost no change in posture, and the relative position with respect to the warp threads is slightly shifted from the blind fabric 1.
shifts in the direction of travel. As a result, the warp threads 2 and the weft threads 3 are uncoupled at the overlapping portion, and the warp threads 2 and the weft threads 3 are reliably separated. On this occasion,
Since the projections 7 do not come into strong contact with the warp threads 2,
It will not damage the warp threads 2. Note that the circumferential speed of the roller 6 may be lower than the traveling speed of the blind fabric 1, and in this case, the weft threads 3 are shifted in the direction opposite to the traveling direction of the blind fabric 1. In this way, it is sufficient that there is a difference between the circumferential speed of the roller 6 and the running speed of the blind fabric 1. 11 is a dividing means installed downstream of the shifting means 5, and this dividing means 1
1 is a blind fabric 1 as shown in Figures 1, 2, and 4.
cutter bodies 12 and 13 arranged to sandwich the
has. Cutter body 12, cutter body 13
are respectively a rotating shaft 14, a rotating shaft 15, and a large number of dividing rings 1 attached at predetermined intervals in the longitudinal direction of these rotating shafts 14, 15.
6 and a dividing ring 17, and these dividing rings 16 and 17 fit into each other while maintaining a gap S. When the blind fabric 1 passes between the cutter body 12 and the cutter body 13, the weft yarn 3 moves from the state shown by the imaginary line in FIG. It deforms as it stretches, and when it reaches the end of its stretch, it splits into multiple pieces. The gap s is larger than the diameter of the warp 2 so that the warp 2 sandwiched between the dividing ring 16 and the dividing ring 17 is not damaged by friction since the warp 2 passes between the dividing ring 16 and the dividing ring 17. . Further, the outer peripheries of these dividing rings 16 and 17 have smooth outer surfaces so as not to damage the warp threads 2. Furthermore, the wall thickness t of these dividing rings 16 and 17 is preferably as thin as possible because the pitch of the warp threads 2 may be less than 1 mm, but if it is too thin, the warp threads 2 will be damaged even if the outer periphery is rounded. Therefore, it is preferably 0.2 mm or more. The dividing ring 16 and the dividing ring 1
The depth at which the wefts 7 and 7 fit together is changed in accordance with the maximum elongation rate of the weft yarn 3 until breakage, and is made deeper when the maximum elongation rate is large and shallow when it is small. Further, the cutter main body 12 and the cutter main body 1
3 is rotated by the motor 18 in the direction C to send out the blind fabric 1 as shown in FIG. 2, and as a result,
The divided weft yarn 3 is designed not to accumulate immediately before the dividing means 11. 21 is a separation means installed downstream of the separation means 11, and this separation means 21
is composed of a brush 22 parallel to the weft 3 and a motor 23 that rotates the brush 22. The brush 22 then brushes off the weft yarn 3 divided into a plurality of pieces from the warp yarn 2 and separates the weft yarn 3 from the warp yarn 2. In this way, the weft yarns 3 separated and scattered from the warp yarns 2 are collected by the duct 24 of the dust collector. As a result, the weft threads 3 are completely removed from the blind fabric 1. Then, the woven fabric with only the warp 2 is sent to a rubber coating process.

Next, the operation of one embodiment of the present invention will be explained.

Now, it is assumed that a blind fabric 1 in which the warp yarns 2 and the weft yarns 3 are joined at the overlapping portion is fed in by dipping treatment in the previous process. At this time, the weft yarns 3 are separated from each other by a predetermined pitch P in the longitudinal direction of the warp yarns 2, as shown in FIG. 5a. The fed blind fabric 1 first reaches the shifting means 5. At this time, the circumferential speed of the roller 6 is faster than the running speed of the blind fabric 1, and the large number of protrusions 7 are caught on the weft threads 3 at the same time, so an external force is applied to the entire weft thread 3 in the traveling direction of the blind fabric 1. The weft threads 3 are uncoupled from the warp threads 2, and are moved parallel to the longitudinal direction of the warp threads 2 by a distance q, as shown in FIG. 5b. As a result, weft 3
are completely separated from the warp threads 2, and the weft threads 3 are entangled with the warp threads 2 only by frictional force. When the blind fabric 1 further travels in the direction of arrow A, the weft yarns 3 reach the dividing means 11. At this time, the warp threads 2 pass between the dividing ring 16 and the dividing ring 17,
On the other hand, the weft yarn 3 is deformed while being stretched along a line connecting the outer peripheries of the dividing ring 16 and the dividing ring 17. However, the total length of this line is
Since this is a length that cannot be reached even when the weft yarn 3 reaches its maximum elongation, the weft yarn 3 is fully elongated and is divided at a plurality of locations. As a result, the weft threads 3 can be separated from the warp threads 2 by only applying a small force. Further, as the blind fabric 1 travels, the divided weft yarns 3 reach the separation means 21. At this time, the divided weft yarns 3 are simply brushed off from the warp yarns 2 by the brush of the brush 22, and then collected by the duct 24. The warp yarns 2 from which the weft yarns 3 have been completely removed in this way are sent to the next process.

Effects of the Invention As explained above, according to the present invention, the weft yarn can be completely separated from the warp yarn, and as a result, even when the blind fabric is used as a reinforcing cord for a tire, the weft yarn will not remain in the tire. do not have.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken in the direction - arrow of FIG. 1, FIG. 3 is a sectional view taken in the direction - arrow of FIG. The cross-sectional view taken along the - arrow in the figure and FIGS. 5a and 5b are explanatory diagrams for explaining the operation. 1... blind fabric, 2... warp, 3... weft,
5... Displacing means, 7... Protrusion, 11... Separating means, 16, 17... Separating ring, 21... Separating means.

Claims (1)

[Claims] 1 A device for removing weft threads from a blind fabric constructed by entwining weft threads with a large number of parallel warp threads separated by a predetermined distance in the longitudinal direction, and applying an external force in the longitudinal direction of the warp to each weft thread over the entire length to remove the weft threads. a shifting means for slightly shifting the entire warp in the longitudinal direction of the warp; a dividing means installed downstream of the shifting means for dividing the displaced weft into a plurality of pieces; and a dividing means installed downstream of the dividing means for dividing the displaced weft into a plurality of pieces. 1. A weft removal device for a blind fabric, comprising a separating means for separating a divided weft from a warp.