JPS61102425A - Zigzag sliver drafter - Google Patents

Abstract

PURPOSE:A sliver is slightly drafted as it is loosened with tooth-shaped grooves, to allow each staple fiber to slide from one another in the yarn whereby a satisfactorily opened sliver is fed to the main drafting zone. CONSTITUTION:A couple of top rollers 20, 30 are pressed down, with pressures P20 and P30, to the grooved bottom roller 11 where one top roller 20 is coated with rubber and the other 30 is grooved. Staple fibers in the sliver 10 which is nipped by the bottom roller 11 and the top roller 30 are pulled out of the staple fibers nipped with the bottom roller 11 and the top roller 20 whereby the sliver 10 is fully opened without damage on each staple fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a draft device flea for a spinning machine. More specifically, the present invention relates to a sliver curve drafting device which is mainly used as a pair of back rollers in a drafting device of a spinning machine which is composed of a plurality of pairs of rollers.

<Prior Art> As a draft device of a spinning machine, a draft device consisting of a plurality of pairs of draft rollers is widely used. That is, the draft devices of cotton spinning machines, sliver wrap machines, ribbon wrap machines, filament machines, roving frames, and fine spinning machines are in most cases composed of a plurality of pairs of draft rollers of this type. In this type of drafting device, the supplied fiber bundle, i.e., a wrap or sliver, is first placed in a placke draft zone where each single fiber comrades constituting the fiber bundle is
M sh and then drafted in the subsequent main draft zone up to a predetermined weight per unit quality.

If the fiber bundles are not sufficiently defibrated in the brake draft zone, incorrect drafting will occur in the main draft zone, and as a result, it will not be possible to obtain a high-quality product.

In particular, in the draft device of the spinning machine before the roving machine, the amount of fiber bundles that is applied to the brake draft zone is large, so it is necessary to draft by multiplying the draft ratio by this amount.
There is a problem in that it is difficult to achieve sufficient fibrillation of the fiber bundles.

Various devices have been proposed to solve the above-mentioned problems. For example, the device disclosed in Japanese Patent Publication No. 53-28739 (1982) discloses a bottom roller 1 and a top roller 2.2' whose suppressing force is adjusted to suppress the bottom roller 1 and its upper surface. The sliver feeding device is equipped with a sliver supply device, and the pressing force P1'E of the dog roller 2 at the front 11111 of the sliver 3 is increased.The pressing force P2 of the dog roller 2' at the rear side of the sliver 3 is increased. The sliver 3 is passed through the top roller 2 (this ensures that each single fiber in the gripped sliver 3 is passed through the top roller 2').
Since the gripping force of the sliver 3 is relatively weak, the curved surface of the roller 1 is used to draft the outer periphery of the sliver 3. Since the removal in this device is performed only by the bending of the hollow roller 1, the degree of removal cannot be increased, and it has not yet been possible to fundamentally improve the above-mentioned problem.

<Problems to be Solved by the Invention> The present invention solves the problems associated with conventionally known draft devices, and can supply a sufficient amount of sliver in a defibrated state to the main draft zone. The purpose is primarily to provide a drafter that can be used as a pair of pack draft rollers.

Means for Solving the Problems> As a result of intensive research in order to solve the above-mentioned problems, the present inventors have found that the sliver is heated by applying a slight draft while rolling the sliver using a so-called tooth shape. The present invention has been achieved by discovering that the above-mentioned problems can be solved by displacing each single fiber of the draft roller to provide an effective dissolving action.That is, the object of the present invention is to The drafting device of a spinning machine mainly consists of an upstream region (a sliver curve drafting device used in At least two top rollers are provided and placed at an interval, and the meshing portion between the bottom roller and the top roller becomes stronger as viewed in the downstream direction in the sliver traveling direction. Both are achieved by a sliver curve drafting device characterized in that the curved shape of the two top rollers is defined.

The sliver curve drafting device of the present invention (which serves as a companion for preventing single fibers in the sliver from being cut)
It is preferable that the distance between the top roller of the book and the circumferential surface of the bottom roller is determined to be greater than or equal to the effective fiber length or cutting length of the stitches in the sliver used.

<Embodiments> Hereinafter, the present invention will be described in detail with reference to the accompanying drawings showing embodiments of the sliver curve drafting device of the present invention.

FIG. 1 shows a schematic front view of an embodiment of the sliver curved gland shearing device of the present invention. In FIG. 1, two dog rollers 20 and 30 are disposed at a distance above the grooved bottom roller 11, each equipped with a pressing device (1 not shown), and each having a pressing force. Received P20+P3o. The top roller 20 of the tenth (in this embodiment, the upstream (III) as seen in the direction of movement of the sliver 10 is rubber-tight, and securely grips the sliver 10 between it and the bottom roller 11. The top roller 30 on the side is 'm'>W'] and the bottom roller J]-' This is an example of the detailed enlarged front view of Figure 4. In the collapse between @tz and 130 adjacent to the bottom roller 11 (this is the dog roller 3).
Ω 31 of 0 enters through the sliver 10, and as a result, the teeth of the bottom roller 11 and the dog roller 30 are in mesh with each other.
Sorrow (Konaru)

As a result, the single fibers in the sliver 10 held between the bottom roller 1 and the top roller 30 will be spread out by the bottom roller 1 and the top roller 20. The single fibers in the clamped sliver 10 are dragged out, and this dragging action causes the sliver 10 to be defibrated.Meanwhile, since the bottom roller 1 is still rotating, it is difficult to The interlocking state changes from a weak state to a maximum state and then to a relaxed state, and as a result, the sliver 1 is dragged on the arcuate surface of the bottom roller 1 while being curved and gradually increasing by 1 m. However, it is possible to defibrate a sufficient amount without damaging each single fiber constituting the sliver 11.

The distance between the top roller 20 and the top roller 30 on the bottom roller 1 is set to a long cutting length in the case of equal length fibers, and a long effective fiber length in the case of cotton fibers to reduce damage to the weaving in the sliver. It is preferable to do so. Even if the above-mentioned interval is long in terms of cutting length or M-effect fiber length, the sliver 11 will be kept in an arcuate shape on the bottom roller 11 while being subjected to a slight draft.

The degree of defibration can be achieved by changing the degree of engagement of the top roller 30 with the bottom roller 11 (this can be done by changing the degree of engagement of the top roller 30 with the bottom roller 11. In other words, generally, the shape of the groove of the bottom roller 11 is constant). However, if the shape of the groove of the top roller 30 is determined so that the teeth 31 of the top roller 30 enter deeply into the groove of the bottom roller 11, the meshing state will be strengthened, and this part The amount of draft in this part can be increased.If the shape of the teeth 31 of the top roller 30 is made gentler or the pitch is made thinner, the meshing state will be weakened, and the amount of draft in this part can be reduced. The degree of engagement is determined depending on the purpose of the curve drafting device of the present invention, specifically, the amount of fibers to be processed and the draft amount of the main draft zone. A top roller having a shape may be used.

In the embodiment shown in FIG. 1, the surface of the top roller 20 upstream in the sliver traveling direction is formed of rubber tips with the weakest engagement. 71) Fig. 3 (In another embodiment of the present invention shown here, a grooved roller is also used for the top roller 25. However, the groove shape of the trough roller 25 is the same as that of the downstream trough roller 35. It is necessary to form an edge-meshing shape loosely.The meshing condition becomes stronger as it goes downstream (If the groove shape of these two top rollers 25, 35 is determined, 11
The fibers in the sliver 10 gripped by the upstream top roller 25 and bottom roller 11 are pulled out from the fibers in the sliver 10 gripped by the upstream top roller 25 and the bottom roller 11, thereby achieving 'J* fibers (of curled fibers). Furthermore, the upstream dog roller 25
The sliver roller of the present invention is also suitable for treating a large amount of fibers because the Pn fibers are advanced. The curve drafting device can be used in the brake draft zone of a roving frame, a wire frame, a ribbon luffing machine, or a sliver lapping machine.

<Effects of the Invention> Since the present invention has the above-mentioned structure, it can be used in a back draft zone of a draft device of a spinning machine, etc., and exhibits an excellent fibrillating effect on T-fibers.

Since the sliver curve drafting device of the present invention can be implemented by simply providing two top rollers having a predetermined groove shape, it can be implemented by modifying an existing spinning machine.

[Brief explanation of the drawing]

FIG. 1 shows a second embodiment of the sliver curve drafting device of the present invention.
FIG. 2 is a schematic front view showing a conventionally known curve drafting device, and FIG. 3 is a schematic front view showing another embodiment of the sliver curve drafting device of the present invention. It is a front view,
FIG. 4 is a schematic front view showing the engaged state of the bottom roller and top roller in the apparatus shown in FIG. 2. 10...Sliver, 11...Bottom roller, 11.12...Bottom roller tooth,
20.25...Top roller on the upstream side in the sliver traveling direction, 30.35...Top roller on the downstream side in the sliver traveling direction, 31...Top roller teeth, P2 ° + P25 + P3 °, P3.・・・・・・
・Pushing force.

Claims (1)

[Scope of Claims] 1. A sliver curve drafting device mainly used in an upstream region in a drafting device of a spinning machine consisting of a plurality of pairs of draft rollers, the curve drafting device comprising a single grooved bottom It consists of a roller and at least two top rollers each equipped with a pressing device and placed at an interval on the bottom roller, and the meshing state of the bottom roller and the top roller is downstream when viewed in the direction of movement of the sliver. A sliver curve drafting device characterized in that the shape of the peripheral surface of the at least two top rollers is determined so that the strength increases as the distance increases. 2. The apparatus according to claim 1, wherein the distance between the at least two top rollers on the circumferential surface of the bottom roller is determined to be greater than or equal to the effective fiber length or cut fiber length of the fibers in the sliver used. . 3. The top roller consists of a first top roller upstream and a second top roller downstream when viewed in the direction of travel of the sliver, and the surface of the first top roller is covered with a substantially smooth rubber cot; 2. The device according to claim 1 or 2, wherein the top roller is a grooved roller.