JPH03161526A - Apparatus for drafting in spinning frame - Google Patents

Abstract

PURPOSE:To carry out changeover of a drafting apparatus from the use for filament to staple fiber or vice versa in a short time without demounting the third roller pair by moving the thirst roller pair, second bottom roller and a pressure bar. CONSTITUTION:When fiber such as filaments, blend fibers and bias cut fiber is drafted, a pressure bar 13 is placed on the upstream side of the second bottom roller (2a) and a fiber group (F) in a strongly pushed down state is passed over the roller (2a) without mounting the second top roller above the roller (2a). When staple fiber is drafted, the second top roller is mounted above the roller (2a) and the pressure bar 13 is placed between the front roller pair 1 and the roller (2a). Thereby, optimum gage setting can be carried out corresponding to a wide range of fiber characteristics.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a bottom roller that is arranged between the largest draft part of the draft according to the characteristics of the fibers to be spun, such as short fibers and long fibers. , and the position of the pressure bar can be easily changed! This invention relates to a draft device in a spinning machine that allows quick switching of the draft device in response to changes in fiber properties such as Jiv & length. [Prior Art] For example, a four-wire draft device, as shown in FIGS. 7 and 8, has four pairs of rollers consisting of a bottom roller and a top roller. 2.3.4, each roller pair 1 to 4 is a roller slide 5, 6, respectively.
, 7.8. The bottom roller and top roller that make up the roller pair will be explained by adding suffixes "a" and "bJ" to the code of the roller pair, respectively. The bottom roller is driven to rotate, and the top roller is An end bracket 9 is fixed to the upper end surface of the second roller slide 6 via a tightening port l1.
Both ends of the second top roller 2b are supported by the end bracket 9. Pressure bar holders 12a, 12b (
However, in FIG. 8, 12b is not shown) is attached, and each pressure bar holder 12a, 12b
Both ends of the pressure bar l3 are supported by
The pressure bar 13 is arranged between the front roller pair 1 and the second roller pair 2. The arrangement of the roller pairs 1 to 4 shown in FIG. 7 is for spinning short fibers. When spinning long fibers with a fiber length of 60 mg+ or more, bias-cut fibers, short fibers and long fibers, blends of animal and plant fibers, and synthetic fibers, etc., with this arrangement of roller pairs, As shown in FIG. 9, while removing the third roller pair 3,
The roller slide 6 to which the second roller pair 2 is attached was fixed again on the upstream side, and the gauge (dimension between the rollers) was set to match the long fibers in the fibers to be spun. As a result, the following problems occurred. (1) When the gauge is set according to the long fibers, the placement position of the pressure bar 13 in the draft part with the largest draft is not appropriate, so the second bottom roller 2a and the pressure bar 13 are too close to each other, and the pressure bar 13 13 and front bottom roller 1a
The distance between the sliver and the sliver was too wide, making it impossible to control the short fibers in the draft section where large drafts were made, resulting in incorrect drafting and uneven weight of the sliver. That is,
When spinning a blend of short fibers and long fibers, or a blend of synthetic fibers and animal and plant fibers (hereinafter collectively referred to as blends), and even bias cant fibers, the length of the short fibers is equal to the pressure bar 13. Since the short fibers are shorter than the distance from the front bottom roller 1a, some of the short fibers are subordinate to the fiber group F on the downstream side and others are subordinate to the fiber group F on the upstream side, and their behavior is unstable. becomes. In addition, short fibers sometimes fall out from the flow of fiber group F, which causes weight unevenness in the spun sliver, degrading its quality. In particular, in blends of synthetic fibers and dense animal and plant fibers, their properties such as frictional resistance, crimp, and fiber length are different, so they tend to separate, and their mutual binding force is small or disappears. Because of this, the fleece often fell out of the normal flow between the rollers. (2) As mentioned above, by attaching and detaching the third roller pair 3 and moving the roller slide 6 to which the second roller pair 2 is attached, changes in fiber length can be accommodated. From fibers to short fibers, blends, and bias-cut fibers,
It cannot be applied widely. (3) Every time the fiber length or type of fiber changes, the third roller pair 3 is attached and removed, and the roller slide 6 to which the second roller pair 2 is attached is moved, so this switching operation is A large amount of time was wasted, leading to a decline in production efficiency. In particular, with the recent diversification of needs, the number of times the draft device has to be switched has increased, and the switching time can no longer be ignored. [Problems to be Solved by the Invention] In view of the above-mentioned problems of the conventional drafting device, the present invention makes it possible to easily switch the drafting device in response to changes in fiber properties such as fiber length, and at the same time, The objective was to make it possible to spin high-quality sliver while being able to handle a wide range of fibers, from short fibers to long fibers, as well as blended fibers and bias-cut fibers. [Means for Solving the Problems] The means adopted in the present invention to solve the above problems is that the draft portion is constructed of two pairs of front and rear rollers, each consisting of a bottom roller and a top roller. A bottom roller that is driven and rotated is provided near the center of the draft portion with the highest draft rate, or upstream of the center, and pressure bars can be placed near the bottom roller on both the upstream and downstream sides. When spinning long fibers or blended fibers, the pressure bar is placed upstream of the bottom roller, and when spinning short fibers,
The pressure bar is arranged downstream of the bottom roller, and a top roller is mounted above the bottom roller, so that each fiber is spun. [Operation of the invention] When spinning long fibers or blended textiles, a resher bar is arranged upstream of the bottom roller arranged in the draft section with the highest draft rate, and above the bottom roller. is not equipped with a top roller. Therefore, the distance between the nip points of the rock fiber group in the draft section becomes long. Although the fiber group is not completely gripped between the two pairs of front and rear rollers forming the draft section, the fiber group is drafted and
It is strongly pressed against the pressure bar and the bottom roller, and this pressed portion becomes a virtual niff point that performs an action similar to the 27-point. For this reason, the frictional resistance between the fibers increases and the fibers are restrained each other, so that the short fibers are properly drafted without following the long fibers, and at the same time, the bottom roller and the pressure bar Since the fiber group is not securely gripped at this point, the long fibers are pulled strongly by the lower pair of rollers and properly drafted without being cut. On the other hand, when drafting short fibers, a pressure bar is placed on the downstream side of the bottom roller, and a top roller is installed above the bottom roller. Shorten the distance between nip points, set each gauge to the fiber length, and perform drafting. [Example] Hereinafter, the present invention will be explained in more detail with reference to Examples.
Note that parts that are the same as those described in the section ``Prior Art'' will be described with the same reference numerals. What is shown in Figures 1 to 3 are long fibers, blended fibers,
In a state where bias-cut fibers are being drafted, an end bracket 9 is movable in the front-rear direction and fixed at a predetermined position on the upper end surface of the second roller slide 6 via a tightening bolt l1. A guide portion 9a is provided inside this end bracket 9,
Both ends of the holder rod l4 are supported by the guide portions 9a of the end bracket 9 so as to be immovable in the front-rear direction but movable in the up-down direction. When the holder rod l4 is supported by the guide portion 9a of the end bracket 9, the holder rod 14 is disposed directly above or almost directly above the second bottom roller 2a, but is not in contact with the second bottom roller 2a. ．． Pressure bar redder rods 12a and 12b are respectively attached to both ends of the holder rod 14 so as to be rotatable about the axis of the holder rod 14. Both ends of the pressure bar 13 have a smaller diameter than the other parts, and this small diameter part 13a fits into the fitting hole 15 provided in the pressure bar holder 12a, 12b.
It is fitted into the holders 12a and 12b, protrudes from the outer surfaces of the holders 12a and 12b, and comes into contact with a guide portion 6a provided on the second roller slide 6. There is a spring seat l6 on the top surface of the pressure bar pressure radar 12a, 12b.
The pressure bar 13 is urged downward by the restoring force of a spring (not shown) that is in elastic contact with the spring seat l6. When the end bracket 9 is moved back and forth, the pressure bar 1
3 are adapted to be moved in the same direction along the guide portion 6a. In addition, in FIGS. 1 to 3, P indicates the direction in which the fiber group F flows. As shown in FIGS. 1 to 3, when drafting long fibers, blended fibers, and bias-cut fibers, the pressure bar 13 is disposed upstream of the second bottom roller 2a, and The second top roller 2b is not installed above the second bottom roller 2a. In this state, when the fiber group F flows between each pair of rollers l, 3, and 4, this fiber group F
is drafted by about 1.2 to 2 times between the bank roller pair 4 and the third roller pair 3, and then at the draft portion with the highest draft rate between the third roller pair 3 and the front roller pair]. It is drafted about 4 to 7 times. In the largest draft part of the draft, the bottom of the pressure par 13 is the third bottom roller 3.
Since the fiber group F is located below the tangent line between the upper part of the upper part of the second bottom roller 2a and the second bottom roller 2a, the fiber group F passes over the second bottom roller 2a while being strongly pushed downward by the pressure bar 13, and the fiber group F passes over the second bottom roller 2a. It is strongly pulled by roller pair l and is drafted greatly. Here, between the third roller pair 3 and the front roller pair 1, the fiber group F is not completely gripped by the bottom roller and the top roller, but the pressure bar 13 is in the above-mentioned positional relationship. At the same time, the fiber group F is largely drafted, so that the fiber group F is placed in the upper part of the second bottom roller 2a.
1 and A, and the pressure bar 13
B at the bottom of, and B! (these are called virtual nip points) are partially strongly pressed against each other, so the frictional resistance between the fibers increases and the fibers restrain each other, and the bottom roller The state is similar to that of being held by the top roller and the top roller. Therefore, the short fibers included in the fiber group F are properly drafted without being driven by the long fiber group, and the phenomenon of the short fibers falling off from the fiber gF does not occur. Moreover, between the third roller pair 3 and the front roller pair 1, the long fibers are
3 and the second bottom roller 2a at each virtual nimp point, it is properly drafted by being strongly pulled by the front roller pair 1 without being cut. In addition, when drafting long fibers, blended fibers, and bias-cut fibers, the second roller slide 6
, or by moving the third roller slide}''7 appropriately, the distance between the nib points at the largest draft part can be adjusted to properly draft.On the other hand, when drafting short fibers, , Figures 4 and 5
As shown in the figure, each presser bar holder 12a, 1 is fitted into the left and right ends of the holder rod l4.
2b left and right, and fit it into both ends of the second top roller 2b.
When both ends of the roller are supported by the guide portions 9a of the end bracket 9, the second top roller 2b is mounted above the second bottom roller 2a. In this way,
Pressure par 13 is second bottom roller 2a
The distance between the nip points in the draft portion where the draft rate formed by the front roller pair 1 and the second roller pair 2 is the highest is shortened. Then, drafting is performed by setting each gauge according to the fiber length of the short fibers to be spun. In this way, the draft device can be switched from long fiber to short fiber or vice versa without removing the third roller pair 3, so the draft device can be switched in a short time. By moving the third roller pair 3, the second photo roller 2a, and the pressure bar 13, it is possible to perform optimal gauge settings corresponding to a wide range of fiber characteristics such as fiber length. Another embodiment shown in FIG. 6 is one in which a pressure bar holder 12a (12b) is integrated with an end bracket 9°. In this way, the holder rod l4 is placed above the second bottom roller 2a.
Since the holder iron is no longer placed, problems such as the accumulation of fluff on the holder iron 14 are eliminated. However, when spinning short fibers, it is necessary to replace the entire end bracket 9'. [Effects of the Invention] According to the draft device according to the present invention, the draft device can be easily switched from one for long fibers to one for short fibers, or vice versa, without removing a specific pair of rollers. Switching can be done in a short time. In addition, it is possible to spin various types of fibers with different fiber properties such as fiber length by attaching and detaching the top roller of a specific roller pair and changing the placement position of the pressure bar without removing the roller pair. This makes it possible to perform optimal gauge settings to accommodate a wide range of fiber properties. Therefore, it can handle a wide range of fibers, including blended fibers and bias-cut fibers, and can also spin high-quality slivers.

[Brief explanation of the drawing]

1 to 6 are diagrams for explaining the present invention, and FIG. 1 shows each pair of rollers 1, 3, 4 and pressure bar 13 of a draft device when spinning long fibers.
FIG. 2 is an enlarged view of the pressure bar 13 in FIG. 1, FIG. 3 is a perspective view of the pressure bar 13 in FIG. The figure is a schematic side view showing the arrangement of each pair of rollers 1 to 4 of the draft device and the pressure parr 13 when spinning short fibers, and FIG. The perspective view shown in FIG. 6 is a perspective view of a portion of the pressure bar 13 supported by a pressure bar holder 12a12b integrally provided at the end bracket 9°. 7 to 9 are diagrams for explaining conventional draft devices, in which FIG. 7 is a perspective view of the draft device when spinning short fibers, and FIG. 8 is an end bracket. FIG. 9, a plan view of the portion 9, is a schematic side view showing the arrangement of each pair of rollers when spinning long fibers. Explanations of the symbols of the main parts constituting the present invention are as follows. 1 to 4: Roller pair la to 4a: Bottom roller 1b to 4b: Top roller 9: End bracket 12a, 12b: Breather 11 pressure par 14: Holder Rondo bar holder

Claims (1)

[Scope of Claims] Near the center of the draft portion having the highest draft rate, or upstream from the center, of the draft portion composed of two pairs of front and rear rollers, each consisting of a bottom roller and a top roller. A bottom roller that is driven and rotated is provided, and a pressure bar is provided near the bottom roller so that it can be placed on both the upstream and downstream sides of the bottom roller, and when spinning long fibers or blended textiles, the bottom roller The pressure bar is placed upstream of the roller, and when spinning short fibers, the pressure bar is placed downstream of the bottom roller, and a top roller is installed above the bottom roller to spin each fiber. A draft device in a spinning machine, characterized in that it is configured to spin.