JPH08246260A - Apparatus for drafting of spinning machinery - Google Patents

Abstract

PURPOSE: To stably convey fibers without wrapping the fibers around parts in the periphery of a conveying passage for the fibers by reducing the quantity of generated static electricity caused in the fibers. CONSTITUTION: This apparatus for drafting of spinning machinery is obtained by arranging pairs of rollers (1, 2, 3, 4 and 5) to come into mutual contact at a prescribed interval side by side and forming a recessed part in a fiber holding part formed in either of a top roller (4t) and a bottom roller (4b) on each side of slivers (SA) and (SB) in at least a pair of rollers (4) therein. The coherent force among fibers is weakened by forming the recessed part to suppress the generation of static electricity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a draft device for a spinning machine.

[0002]

2. Description of the Related Art In a draft device of a spinning machine, a sliver is passed between a plurality of top roller and bottom roller pairs,
The sliver is made to have a desired thickness by giving a rotational speed difference between each pair of rollers, but at least one pair of top roller and bottom roller among a plurality of pairs of rollers of the draft device. An endless belt called an apron belt is attached to each of them so that the fibers are evenly slipped. In this way, a pair of top rollers
There is a drafting device, which is a so-called double apron draft system, in which an apron belt is attached to each of the bottom roller and the bottom roller to perform drafting.

An example of a conventional draft device for a spinning machine is shown in FIG. The illustrated draft device relates to a twin yarn spinning machine that spins two single yarns from two slivers (SA, SB) and combines them into twin yarns. The sliver (SA) side and the sliver Since the mechanism is the same as that on the − (SB) side, only the sliver (SA) will be described. In the draft device (56) shown in FIG. 5, five pairs of rollers (51, 52, 53, 54, 55) are arranged, and each pair of rollers is a top roller (51t, 5).
2t, 53t, 54t, 55t) and bottom roller (5
1b, 52b, 53b, 54b, 55b). Then, the second roller pair (52) top roller
For the roller (52t) and the bottom roller (52b),
An apron belt (52EtA) and an apron belt (52EbA) are attached, respectively. The second roll
The second of the pair of laps is the second from the downstream side in the sliver feed (fiber feed) direction.
La pairs are also counted. Also, the fourth roller pair (54)
Top roller (54t) and bottom roller (5t)
Also in 4b), an apron belt (54EtA) and an apron belt (54EbA) are attached, respectively.
That is, the second roller pair (52) and the fourth roller pair.
The pair (54) is a double apron draft system.

The top roller (51t, 52t, 53
t, 54t, 55t) are fixed in pressure contact with the corresponding bottom rollers (51b, 52b, 53b, 54b, 55b). The second top roller
The (52t) and the fourth top roller (54t) are pressed against the second bottom roller (52b) and the fourth bottom roller (54b) via the apron belt. Then, each bottom roller (51b, 52b, 53b, 54
Each of the roller pairs (51, 52, 53, 54, 55) is rotated by applying rotational drive to b, 55b). The sliver (SA) is drafted and adjusted to a predetermined thickness by the difference in the rotating surface speeds given between the roller pairs. At that time, the apron belt (54
EtA) and apron belt (54EbA) and apron belt (52EtA) and apron belt (52EbA)
Has a function of holding the sliver while allowing it to pass therethrough and causing a uniform slip.

FIG. 6 shows a cross section of the sliver gripping portion of the fourth roller pair. Sliver (SA, SB)
Are apron belts (54EtA, 54Eb)
A, 54EtB, 54EbB).
The sliver grip of the top roller (54t) is formed to have a diameter smaller than the diameter of the other portions, and the sliver grip has a recess (60). This weakens the sliver-gripping force more than without the recess (60).

[0006]

When drafting a sliver, the draft force and the static electricity generation amount are in a substantially proportional relationship. Draft force is the pull-out resistance force when pulling out the fiber between rollers, it changes depending on the number of fibers in contact, entanglement, density, and if the draft force is increased, the contact between fibers and the entanglement become high. The amount of static electricity generated also increases. (In particular, there are many cases where a sliver made of 100% wool and a sliver made of a chemical fiber such as acrylic, nylon or polyester are used as raw materials.)

In the conventional double apron draft system,
As shown in FIG. 6, although the grip of the sliver (SA, SB) is provided with a recess (60) in the top roller (54t), it is restrained by a pair of rubber apron belts. In this state, the fiber gripping and controllability is improved, but the draft force is increased and the amount of static electricity is increased. The generation of the static electricity has a drawback that the fibers constituting the sliver are wound around the downstream roller and the parts around the fiber conveying path of the apron belt.

Further, in order to prevent the fibers from wrapping around the parts around the fiber conveying path of the roller or apron and to form a good quality spun yarn, the setting range of the draft ratio is limited. There was also a drawback.

An object of the present invention is to solve the above problems, to provide a drafting device for a spinning machine which can suppress the generation of static electricity and prevent the fibers from being wound around a part around the fiber conveying path. .

[0010]

In order to achieve the above object, in the draft device of the spinning machine of the present invention, a plurality of pairs of rollers contacting each other are arranged side by side at a predetermined interval. , At least one of these pairs of rollers
A recess is provided in the fiber gripping portion of either the top roller or the bottom roller of the pair of rollers.

Further, three or more pairs of rollers are provided, and among two adjacent pairs of rollers, between two adjacent pairs of rollers having a relatively small draft ratio. A recess was provided in the fiber gripping portion of either the top roller or the bottom roller of the roller pair on the upstream side in the fiber feeding direction.

Further, a roller having a concave portion in the fiber gripping portion.
The other one of the rollers has an apron belt, and a top roller and a bottom roller are provided through the apron belt.
It was constructed so as to come into contact with the laser.

In addition, a pair of rollers which contact each other are connected to each other.
A pair of top rollers which are arranged side by side at a predetermined interval and which are the fourth pair of rollers from the downstream side in the fiber feeding direction.
Alternatively, a recess is provided in the fiber grip portion of one of the bottom rollers.

Further, among a plurality of pairs of rollers, at least one pair of rollers has a top roller or a bottom roller.
One or both of the rollers has an apron belt, and the apron belt or the pair of apron belts is configured to bring the top roller and the bottom roller into contact with each other, and the other rollers. A top roller or a bottom roller of at least one pair of the roller pairs
You may provide a recess in the fiber holding part of either roller.

Further, three or more pairs of rollers are provided, and one pair of rollers is provided between two pairs of rollers having a relatively small draft ratio among the two pairs of rollers. A roller was provided and the pair of rollers was provided with a recess in the fiber grip of either the top roller or the bottom roller.

Further, the draft ratio between the two pairs of rollers having a relatively small draft ratio is set to 5 or less.

Further, five pairs of rollers are provided, and an apron belt is provided on each of the top roller and the bottom roller of the second roller pair from the downstream side in the fiber feeding direction, Further, the draft ratio between the third roller pair and the fifth roller pair from the downstream side in the fiber feeding direction is set to the first roller pair and the third roller pair. Was set to be smaller than the draft ratio between the first roller and the second roller pair, and a recess was provided in the fiber grip portion of either the top roller or the bottom roller of the fourth roller pair.

[0018]

With the structure of the present invention, the binding force of the fibers of the sliver-holding portion during drafting is significantly reduced, and the resistance force and frictional force are reduced. As a result, generation of static electricity is suppressed, and the sliver is transported reliably. Further, if the recesses are provided in the roller pair having a relatively small draft ratio, the influence on the physical properties of the yarn can be reduced.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are perspective views showing a spinning machine equipped with an embodiment of a draft device according to the present invention. In these figures, only one unit of the spinning machine is shown, and the spinning machine is provided with a large number of the units arranged side by side in the horizontal direction of the machine base.

Therefore, first, an outline of each unit of the spinning machine will be described with reference to FIG. The structure of the main part of the unit of this spinning machine is composed of a five-wire draft device part (6), a spinning device part (7), and a winding device part (8) in order from the upstream side to the downstream side of fiber conveyance. ing. Since this spinning machine is a twin-spinning spinning machine, the 5-wire draft device unit (6) and the spinning device unit (7) are connected to the sliver (S
On the A) side and the sliver (SB) side, those having the same mechanism are arranged in parallel. Therefore, the same mechanical portion will be described as a representative on the sliver (SA) side. In this embodiment, a sliver made of long fibers such as wool is used as the sliver.

The structure of each device unit is as follows.
The draft device section (6) has five pairs of roller pairs (1,
2, 3, 4, 5) are deployed. Second roller pair top roller (2t) and bottom roller (2b)
, An apron belt (2EtA) and an apron belt (2EbA) are attached to each, and the bottom roller (4b) of the fourth roller pair (4) is also attached with an apron belt (4EbA). .

The sliver (fiber bundle) (SA) in the can (21A) is directly supplied to the draft device section (6) via the trumpet guide (20A). Details of the draft device unit will be described later.

The spinning device (7) is provided with a spinning nozzle (9A) and a dust collector (15A) equipped with a suction pipe (16A). At the downstream side of the dust collector (15A) for fiber conveyance, a nipple
Delivery roller (10) pressed against the roller (10n)
Has been deployed.

The drafted sliver (SA) is delivered from the front roller pair (1), reaches the spinning device section (7), passes through the spinning nozzle (9A), and reaches the nip roller (10n). Delivery roller (1
0). The spinning nozzle (9A) has two nozzles that generate a swirling air current in the yarn path inside by swirling air by the compressed air jet with the opposite rotation direction. The sliver (SA) is false-twisted by passing through the spinning nozzle (9A) to form a bundled spun yarn (Ya) in which winding fibers are present on the surface layer of parallel core fibers. At that time, the generated cotton wool is sucked by the dust collector (15A) and collected through the suction pipe (16A).

Like the sliver (SA), the drafted sliver (SB) also passes through the spinning nozzle (9B) and is formed as a single yarn (Yb) of the spun yarn.

The winding device section (8) is provided with a yarn guide (1).
1), slack tube (12), yarn clearer
(13), the traverse device (22) and the winding drum (not shown) are sequentially arranged from the upstream side to the downstream side of the fiber conveyance.

Then, each formed single yarn (Y
a) and the single yarn (Yb) are pulled out by the nip roller (10n) and the delivery roller (10), reach the winding device section (8), and are pulled by the yarn guide (11). The two yarns (Y) are aligned and formed, and the finished two yarns (Y) are shown in the drawing while being checked by the yarn clearer (13) for yarn defects and traversed by the traverse device (22). It is wound up on a package (14) which is rotationally driven by a winding drum omitted. Yarn Clearer (1
When the yarn defect is detected in 3), the yarn clearer
The yarn (Y) is cut by a cutter attached to (13) and spliced by a splicing device (not shown). The slack tube (12) absorbs the slack of the yarn at the time of piecing.

Next, details of the draft device section will be described.
FIG. 1 is a perspective view showing the details of the draft device section (6). In the draft device section (6), the first roller pair (front roller pair) is arranged in this order from the downstream side (downward in the figure) of fiber conveyance.
Pair) (1), second roller pair (2), third roller pair (3), fourth roller pair (4), fifth roller pair (back roller) -Vs. (5) is deployed. Each roller pair is a top roller (1t, 2t, 3t, 4t, 5t)
And a bottom roller (1b, 2b, 3b, 4b, 5b).

Each bottom roller (1b, 2b, 3b, 4
b, 5b) are made of, for example, metal, and the rotating surface in contact with the top roller is provided with a line in the direction of the central axis. Top Roller (1t, 2t, 3t, 4t, 5
The contact surface portion with the bottom roller of t) is made of synthetic rubber or the like.

Second roller pair (2) top roller
(2t) and bottom roller (2b) have an apron belt (2EtA) and an apron belt (2EbA).
Are installed respectively. However, although the apron belt (4EbA) is attached to the bottom roller (4b) of the fourth roller pair (4), the fourth top roller (4EbA) is attached.
No apron belt is attached to (4t). That is, the second roller pair (2) is of double apron draft type. However, the fourth roller pair (4) is not a double apron draft system. Then, as shown in FIG. 3, the fourth top roll
The fiber gripping portion of the roller (4t) is formed to have a smaller diameter than the other portions, so that the recess (N) is provided on the outer circumference of the fiber gripping portion of the fourth top roller (4t). The depth of the recess (N) is the bottom roller (4b) and the top roller.
With the bottom surface of the recess (N) of the roller (4t).
A) is set to a size that can be appropriately gripped. The apron belt described above is an endless belt made of leather or synthetic rubber, and is attached so as to surround the roller.

Each top roller (1t, 2t, 3t, 4
t, 5t) are rotatably supported by a draft cradle (17), and the draft cradle is swingably supported by a support shaft (18) fixed to the machine frame. . Then, the draft cradle (17) is lowered, and the respective top rollers (1t, 2t, 3t, 4t, 5
t) for each bottom roller (1b, 2b, 3b, 4b, 5
The draft cradle (17) is fixed by rotating the lever (19) while being pressed against b). The second top roller (2t) and the second bottom roller (2b) have an apron belt (2EtA) and an apron belt (2Eb).
The fourth top roller (4t) and the fourth bottom roller (4b) are pressed against each other via the apron belt (4E).
It is pressure-welded via bA).

Each bottom roller (1b, 2b, 3b, 4
Reference numerals b and 5b) are drive rollers connected to a power source (not shown) at the end of the spinning machine, and all the units are driven and rotated simultaneously. A timing belt (not shown) is mounted between the back bottom roller (5b) shaft and the fourth bottom roller (4b) shaft and is connected to a power source (not shown). There is. Further, a timing belt (not shown) is similarly mounted between the third bottom roller (3b) shaft and the second bottom roller (2b) shaft, and a power source (not shown) is also installed. Not)).
The front roller (1b) shaft is directly connected to a power source (not shown).

When drive rotation is applied to the back bottom roller (5b) shaft, the back top roller (5t), which is in pressure contact with the back bottom roller (5b), comes into contact with the back bottom roller (5b).
Rotational force is transmitted from the contact part and back top roller
(5t) performs driven rotation. 4th bottom roller (4
b) When drive rotation is applied to the shaft, the fourth bottom roller
Apron belt (4EbA) attached to (4b)
The rotational force is transmitted to the apron belt (4EbB) and the apron belt (4EbA) and the apron belt (4EbB).
B) are driven to rotate. Further, the rotational force of the apron belt (4EbA) and the apron belt (4EbB) is transmitted to the fourth top roller (4t), and the fourth top roller (4t) is driven to rotate. Third bottom row
When the driving rotation is applied to the shaft of the roller (3b), the rotational force is transmitted to the third top roller (3t) which is in pressure contact with the third bottom roller (3b), and the third rotation Top row
The roller (3t) is driven to rotate. Second bottom roller
When the drive rotation is applied to the (2b) axis, the second bottom roll is performed.
Apron belt (2Eb attached to the la (2b)
Rotational force is transmitted to the apron belt (2EbB) and the apron belt (2EbA) and the apron belt (2EbB).
EbB) are driven to rotate. The rotational force of the apron belt (2EbA) is transmitted to the apron belt (2EtA) that is in pressure contact with and is in contact with the apron belt (2EbA).
EtA) is driven to rotate and apron belt (2EbB)
The rotational force of the apron belt (2
It is transmitted to EtB), and the apron belt (2EtB) is driven to rotate. Then, the rotational force of the apron belt (2EtA) and the apron belt (2EtB) is transmitted to the second top roller (2t) and the second top roller (2t).
In t), driven rotation is performed. Front bottom roller (1
b) When drive rotation is applied to the shaft, the front bottom roll
Rotational force is transmitted from the contact portion to the front top roller (1t), which is in pressure contact with the roller (1b), and the front top roller (1t) is driven to rotate.

Then, each bottom roller (1b, 2b,
3b, 4b, 5b) are provided with different speeds of rotation, and each roller pair (1, 2, 3, 4, 5) rotates at a different speed so that each roller pair is rotated. A rotation speed difference is given between them. The rotating surface speed of the third roller pair (3) is set higher than that of the back roller pair (5), and the rotating surface speed of the front roller pair (1) is
It is set faster than the rotating surface speed of the third roller pair (3). The rotating surface velocity of the second roller pair (2) is slightly higher than that of the third roller pair (3) and is higher than that of the front roller pair (1). It is set late. Also, the fourth roller pair (4)
Is set to be slightly higher than that of the back roller pair (5) and slower than that of the third roller pair (3). In this embodiment, the draft ratio between the third roller pair (3) and the back roller pair (5) is set to 5 or less, and the front roller pair (1) is set.
And the draft ratio between the third roller pair and (3) is set to 20 or more.

By doing so, the sliver
Is drafted at a predetermined draft ratio and adjusted to a predetermined thickness by the difference in the rotating surface speeds given between the respective roller pairs. Front roller pair (1) and third roller
The distance between the pair (3) and the distance between the third roller pair (3) and the back roller pair (5) are set to be longer than the maximum fiber length of the fibers forming the sliver. .

The sliver (SA) supplied from the back roller pair (5) side is connected to the back roller pair (5) and the third sliver (SA).
It is stretched between the roller pair (3), further stretched between the third roller pair (3) and the front roller pair (1), and drafted to a predetermined thickness. Also, the fourth roller pair (4)
And the second roller pair (2) are between the back roller pair (5) and the third roller pair (3) and the third roller pair (3) and the front roller, respectively. The sliver drafted between the ra pair (1) is supplementarily drafted to stabilize the draft. At the time of the draft, the sliver (S
A) is an apron belt (4EbA) mounted on the fourth bottom roller (4b) and a fourth top roller (4t).
It is gripped by the recess (N) provided in the. here,
The apron belt (4EbA) does not have a main function and may not be attached. Further, in the second roller pair (2), the apron belt (2EbA) and the second top roller mounted on the second bottom roller (2b).
The apron belt (2EbA) attached to (2t) is
The sliver (SA) is gripped and passed, and evenly slips to cause drafting.

In the above description, the twin-spin spinning machine is described as an example, but the present invention is not limited to the twin-spin spinning machine, and may be a single-spin spinning machine. Further, the fiber group supplied to the draft device (6) may not be a sliver, and may be, for example, a roving.

FIG. 3 shows a cross section of the sliver grip of the fourth roller pair (4). Sliver
(SA, SB) is a cross section of the fiber gripper in the state of being conveyed. The sliver (SA, SB) consists of an apron belt (4EbA, 4EbB) and a fourth top roller (4
It is gripped by the recess (N) provided in t).
The fibers forming the sliver (SA, SB) are in a non-restrained state in which contact between fibers, density, and entanglement are low as compared with the gripped state of the sliver shown in FIG. Therefore, the drag force and the friction force between the fibers during drafting are shown in FIG.
Compared with the case of, the generation of static electricity is suppressed.

FIG. 4 is a graph showing an example of the relationship between the draft ratio and the yarn physical property value between the third roller (3) and the back roller (5). The horizontal axis represents the draft ratio between the third roller and the back roller, and the vertical axis represents the degree of uniformity (U%). c1 is a threshold value indicating the degree of uniformity that can be used in terms of quality, and c1% or less can be used. The yarn type was 52% polyester, 48% wool and 60 count yarn.

In the case of the conventional example shown in FIG. 6, the draft ratio is 6
However, when the draft ratio is 7 or more, the fibers are wrapped around the roller and the like, so that the usable draft ratio range is 6 to 7. The range is narrow and the range of condition settings is narrow. That is, since the controllability of the fiber is high, when the proper condition is selected, the draft performance is high, but it is difficult to select the proper condition.

On the other hand, in the device of the present invention, the draft ratio is 2 to
It can be used qualitatively within the range of 5.5, and the winding of fibers does not occur. Compared with the conventional device, the device of the present invention can set the draft ratio in a wider range. This is because the controllability of the fiber becomes low and the condition setting becomes easy. Further, when used at a relatively small draft ratio of about 5 or less, it is considered that the influence of the fiber control force on the draft performance is small and that the draft performance is hardly deteriorated by the reduction of the fiber control force.

[0042]

As described above, the draft device of the spinning machine of the present invention eliminates the constraint state of the fiber bundle as in the case of drafting by the double apron system, and the constraint force of the fiber in the fiber bundle, the fiber The contact between them is significantly reduced, and the pull-out resistance and frictional force are also reduced. Therefore, the amount of static electricity generated in the fiber bundle during drafting can be suppressed. As a result, inconveniences such as draft irregularity and cutting of the fiber bundle are solved without being entangled with the rollers and peripheral parts due to static electricity, and the fiber bundle can be reliably and stably conveyed. Especially small draft ratio (preferably 5 or less)
If the recesses are provided in the roller pairs provided at the set places, the quality of the yarn can be formed without lowering the draft performance.

Further, a high quality spun yarn is formed and
The draft ratio setting for preventing wrapping around the parts around the fiber conveying path of the lars and aprons can be set in a wider range compared to the conventional double apron system.

Furthermore, since it is not necessary to use an apron belt, which is a consumable item, there is no need to replace the apron belt, and maintainability is improved. Further, since the number of parts of the draft device is reduced, there is an advantage that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a draft device of a spinning machine.

FIG. 2 is an overall perspective view showing a spinning machine.

FIG. 3 is a sectional view of a fourth roller pair portion.

FIG. 4 is a graph showing a comparative example of the relationship between the draft ratio and the yarn physical property value between the third roller and the back roller according to the present invention and the prior art.

FIG. 5 is a perspective view of a conventional draft device.

FIG. 6 is a sectional view of a conventional fourth roller pair portion.

[Explanation of symbols]

1 Front Roller Pair 2 Second Roller Pair 3 Third Roller Pair 4 Fourth Roller Pair 5 Back Roller Pair 6 Draft Device Part 17 Draft Cradle 19 Lever 1t, 2t, 3t, 4t, 5t top roller 1b, 2b, 3b, 4b, 5b bottom roller 2EtA, 2EbA, 2EtB, 2EbB apron belt 4EbA, 4EbB apron belt N concave portion SA, SB sliver Ya, Yb single yarn Y Soito

Claims (8)

[Claims] 1. A plurality of pairs of rollers which are in contact with each other are arranged side by side at a predetermined interval, and at least one pair of rollers among the plurality of pairs of rollers is arranged on top of each other. −
A draft device for a spinning machine, characterized in that a recess is provided in a fiber gripping portion of either the roller or the bottom roller. 2. A pair of rollers is provided in three or more pairs, and between two adjacent pairs of rollers, each pair of adjacent rollers has a relatively small draft ratio. 2. The fiber gripping portion of either the top roller or the bottom roller of the roller pair on the upstream side in the fiber feeding direction is provided with a recess. Draft device of spinning machine. 3. An apron belt is provided on the other one of the rollers having a recess in the fiber gripping portion, and a top roller and a bottom roller are provided via the apron belt. −
The draft device of the spinning machine according to claim 1 or 2, wherein the draft device is configured to be in contact with. 4. A pair of rollers in contact with each other, 5 pairs,
The fiber gripping portion of either the top roller or the bottom roller of the fourth roller pair, which is the fourth roller pair from the downstream side in the fiber feeding direction, is arranged side by side at a predetermined interval. 4. A recess is provided in the groove, and claim 1 or claim 3 characterized in that
The drafting device of the spinning machine described in 1. 5. A top roller or a bottom roller of at least one pair of rollers among a plurality of pairs of rollers.
Either or both of them, an apron belt is provided, and the top roller and the bottom roller are configured to be in contact with each other via the apron belt or the pair of apron belts, and the other rollers. 5. A recess is provided in the fiber gripping portion of either the top roller or the bottom roller of at least one pair of rollers of the pair. A draft device for a spinning machine according to any one of the above. 6. A pair of rollers is provided in three or more pairs, and one pair of rollers is provided between two pairs of rollers having a relatively small draft ratio among the two pairs of rollers. A pair of rollers is provided, and the pair of rollers is provided with a recess in the fiber gripping portion of either the top roller or the bottom roller. The draft device for a spinning machine according to any one of 1 to 5. 7. The draft device for a spinning machine according to claim 6, wherein the draft ratio between two pairs of rollers having a relatively small draft ratio is set to 5 or less. 8. An apron belt is provided on each of the top roller and the bottom roller of the second roller pair from the downstream side in the fiber feeding direction, which comprises five pairs of rollers. And the draft ratio between the third roller pair and the fifth roller pair from the downstream side in the fiber feeding direction is the first roller pair and the third roller pair. It is set to be smaller than the draft ratio between the pair of rollers and is either the top roller or the bottom roller of the fourth roller pair.
The draft device for a spinning machine according to any one of claims 1 to 7, wherein the fiber gripping portion is provided with a recess.