CN1420219A - Device for drawing and collecting ribbon - Google Patents

Abstract

Behind the drafting zone of a drafting device of the spinning frame there is a collection zone for collecting the drawn fiber sliver. A breathable conveyor belt transports the fiber strips through the collection area. This zone consists of a suction slot and a suction slot covered by a conveyor belt. The traversing device, which reciprocates across the conveying direction of the fiber sliver, is arranged on the drafting device. The negative pressure tank is connected to a traverse transmission mechanism that moves synchronously with the traverse device, and is preferably connected to a traverse rod of the traverse mechanism through a connecting piece. In this way, the fibers always reach the same starting position of the suction slot, even when the fiber strip is traversing.

Description

Device for drawing and collecting fiber strips

The invention relates to a device for drafting and collecting a sliver on a spinning frame, in which a collecting area is arranged behind a drafting area in the drafting device, an air-permeable conveyor belt for transporting the fiber sliver through the collecting area, a The collection area is covered by the conveyor belt, a suction slot arranged on a negative pressure groove and a traverse device installed on the drafting device to reciprocate the fiber strip transversely to its conveying direction.

The prior art of this device is known from the DE 44 26 278 A1 patent. Since the suction slot is located in a fixed negative pressure groove, the fiber strip moves back and forth transversely to its transport direction, and the fiber strip does not always reach the suction slot in the same position. In order to make the traversing fiber strips can be completely grasped by the suction slots, the opening of the suction slots is specially set to be wider than the width of the traversing stroke, so that the traversing fiber strips no longer miss the fixedly placed suction slots. , but the fiber strips will still reach different positions of the suction slot, so the size of the collection changes periodically with the transverse stroke. Furthermore, the initial widening of the suction slot has the disadvantage of a higher air consumption.

The task of the present invention is to ensure that the traversing fiber sliver always reaches the same position of the suction groove without increasing the air consumption, and the quality of the yarn will not fluctuate due to the transverse movement of the fiber sliver.

The solution to this task is that the vacuum tank is connected to a traversing drive running synchronously with the traversing device.

Due to the features of the invention, the fiber strip drawn in the drafting zone always reaches exactly the starting position of the suction slot of the collection zone, even if the starting suction slot is slightly narrower. In this way all fibers can be assembled in the same way and with the same strength.

Although it is understood from Figure 7 of DE 198 46 268 A1 that a negative pressure groove with a suction slot is to carry out a transverse movement together with a conveyor belt transverse to the transport direction of the fiber strip, but the fiber strip does not participate in this transverse movement at this time . Instead, through the lateral movement of the negative pressure groove, the fiber strips are straightened at the suction slot, thereby strengthening the gathering.

Although the traversing drive of the negative pressure tank basically does not depend on the traversing device, it must be controlled synchronously with the traversing device. However, the design of the present invention is that the negative pressure groove is connected with a traverse rod of the traverse device by means of a connecting piece. In this way, through a simple mechanical connection, the negative pressure groove and the lateral reciprocating motion of the traverse device can be absolutely synchronized.

In addition, the conveyor belt is also connected to the traverse drive mechanism. For example, the conveyor belt is designed in the form of a conveyor belt and it is more advantageous to guide it slidingly on a sliding surface of the vacuum groove.

Since the negative pressure groove and the traversing device traverse synchronously, the traversing stroke of 6 to 10 millimeters that has been generally used in the ring spinning frame can be fully maintained so far.

Other advantages and features of the present invention can be understood from the description of the following implementation examples.

Figure 1 is a partial sectional side view of a drafting unit with the following collection area, in which several components of the traversing unit have been omitted.

Fig. 2 is a plan view according to the arrow direction of Fig. 1, and the top roller of the drafting device that pressurizes the rocker arm and the drafting device installed on it is omitted among the figure.

The device according to the invention of FIGS. 1 and 2 is a component of a spinning frame, in particular of a ring spinning frame, for each adjacently installed spinning spindle.

The drafting device 1 shown in the figure may be provided for each spinning spindle, or for two adjacent spinning spindles. The well-known three-roller drafting device structure includes a rear roller pair 2, a middle apron roller pair and front roller pair 4. The bottom rollers 5, 6, 7 of the coordination roller pairs 2, 3 and 4 are preferably connected to a driven roller line running through the length of the machine. Cot rollers 8, 9 and 10, which cooperate with bottom rollers 5, 6 and 7, are always assigned to a spinning spindle and, if necessary, connected with adjacent top rollers to form so-called double top rollers. The apron roller pair 3 is generally configured with a lower apron 11 and an upper apron 12 and a so-called guide bar table 13 is installed on the lower apron roll.

Usually the top rollers 8 , 9 and 10 are clamped on a pressing beam 14 and elastically pressed against the associated bottom rollers 5 , 6 and 7 .

A sliver or roving 15 indicated by a dotted line is usually drawn to the required count in the drafting device 1 in the conveying direction A. The drafting zone 17 of the drafting device 1 is terminated at an output nip line 16 of the front roller pair 4 .

An input collector 18 is placed before the rear roller pair, a collector 19 installed in the front drafting area is arranged before the middle apron roller pair 3, and a collector 20 arranged in the main drafting area is arranged before the front roller pair 4 ago. The purpose of these collectors 18, 19 and 20 is to collect the sliver or roving 15 laterally during drafting. This is not enough in the usual way, because a so-called spinning triangle is formed behind the output nip line 16, and if the drawn fiber sliver 22 immediately obtains its spinning twist, this triangle will have a negative impact on the yarn Quality plays a bad role. That is, the spinning triangle has edge fibers that are not fully co-twisted in the spun yarn and therefore have practically no effect on the strength of the yarn.

In order to remedy this disadvantage, it has recently been arranged that after the drafting device 1 a so-called collecting zone 21 is arranged, in which the fiber strip 22, which is not yet twisted and indicated by a dotted line, is drawn with the aid of its edge fibers. The sides are condensed and clustered or assembled. The spinning triangle is no longer formed on the output nip line 30 bounded by the output side behind the collection area 21, so the strength and uniformity of the formed yarn 31 are better and less hairy.

The fiber strips 22 to be assembled are transported through the assembly area by an air-permeable conveyor belt 23 . The conveyor belt 23, as shown in FIGS. 1 and 2, can be designed, for example, as a thin fine mesh fabric belt. The conveyor belt 23 slides over the outer contour of a vacuum groove 24 designed as a hollow profile and extending to a machine segment. The conveyor belt 23 leaves the vacuum groove 24 on the side facing away from the assembly area 21 and passes a tensioning element 25 . The tension member is arranged so that the conveyor belt 23 touches the bottom roller 7, and at this moment the conveyor belt 23 and the bottom roller move in opposite directions to each other. In this way, fiber fly that may adhere to the conveyor belt 23 is continuously cleaned off.

The negative pressure tank 24 extends to a machine section rather than the whole machine, and it has a negative pressure connecting pipe 26 on each machine section. In the region of the sliding surface of the negative pressure groove 24 provided in the collecting area 21, a suction slot 27 extending mainly in the transport direction A is arranged, which although wider than the fiber strip 22 is relatively narrow. It is slightly inclined relative to the transport direction and is covered by transport means 23 . Due to the slightly inclined arrangement of the slots, a frill is formed on one side of the suction slot 27, along which the fiber strip 22 to be assembled runs and an additional weak false twist is obtained.

The output side of the collection area 21 is delimited by a gripping roller 29 which is also clamped on the pressure cradle 14 . It drives the conveyor belt 23 and together with the negative pressure groove 24 plays a role of anti-twisting in spinning twisting.

The gripping rollers 29 together with the negative pressure grooves 24 define the output nip line 30 on which no spinning triangle is produced due to the presence of the collection area 21 . The output nip thread 30 as a twist stop plays the role of keeping the fiber strip 22 untwisted in the collection area 21 in terms of imparting spinning twist to the yarn 31 . The yarn 31 enters, in the direction of transport B, a twisting device (not shown), for example a ring spindle.

The above-mentioned collectors 18, 19 and 20 are all connected to a traversing device 32 which traverses the collectors 18, 19 and 20 and the fiber strips or rovings 15 and the fiber strips 22 to be collected transversely to the transport direction A A traverse stroke of about 6 to 10 mm. The main purpose of this traversing is to prevent the top apron 12 of the drafting device 1 and the top roller 10 of the front roller pair 4 from wearing out too quickly. Transversal movement is obtained by means of a traverse rod 33 connected to a transmission mechanism not shown in the figure. The traverse rod is directly connected with the input collector 18 and is connected with other collectors 19 and 20 connections. Thus the entire collector 18, 19 and 20 reciprocates according to the traversing directions C and D.

If the drafting device 1 is equipped with a conventional collecting device 21, there is a danger that the fiber strip 22 leaving the output nip line 16 will not reach the initial position of the suction slot 27 of the drafting zone 21 exactly. The fibers should always be received in the same position, since only in this way can all the fibers be assembled in the same way. Therefore, according to the arrangement of the present invention, the negative pressure groove 24 also participates in the reciprocating motion of the traversing device 32 . For this purpose, the vacuum channel 24 is displaceable in the lateral direction and in this case is connected to the traversing rod 33 . So the negative pressure groove 24 also participates in the reciprocating movement according to the traversing directions E and F.

The connector 36 that makes the negative pressure groove 24 link to each other with the traversing device 32 is the connector 36 that uses as the transverse transmission mechanism 35 for the negative pressure groove 24. , 7 above the longitudinal beam constitutes.

The negative pressure groove 24 participates in the reciprocating movement of the traverse rod 33 like this, and the fiber strips that should be assembled also always arrive at the same position of the suction slot 27 participating in the traverse.

If, according to the above-mentioned embodiment, the conveyor belt 23 is designed as a conveyor belt that slides over the negative pressure groove 24, then it is necessary for the conveyor belt 23 to traverse together with the negative pressure groove. For this reason, the corresponding synchronous blocks 38 and 39 are arranged beside the negative pressure groove 24, and its spacing is equivalent to the width of the conveyer belt, and the blocks are guided on the side and participate in lateral reciprocating motion.

Claims (4)

1. carry out the drawing-off and the device of collecting one ribbon subsequently on fine spining machine, dispose a set district behind the draw zone that is positioned at drafting system, the ventilative conveyer belt of a conveying fibre rod by the set district arranged, have one be arranged on set district, betransported that band covers and be placed in the air-breathing line of rabbet joint on the negative pressure trough and one be placed in and make ribbon horizontal on the drafting system facing to the reciprocating traversing gear of transporting direction, it is characterized in that negative pressure trough (24) is connected to a transverse transmission mechanism (35) with traversing gear (32) synchronous operation.

2. device according to claim 1 is characterized in that, negative pressure trough (24) is connected with the traverse bar (33) of traversing gear (32) by a connector (36).

3. device according to claim 1 and 2 is characterized in that, conveyer belt (23) is connected on the transverse transmission mechanism (35).

4. according to one of in the claim 1 to 3 described device, it is characterized in that the stroke that traverses (h) of traversing gear (32) is 6 to 10 millimeters.

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