CN1727537A

CN1727537A - Leather collar for drafter of spinning machine

Info

Publication number: CN1727537A
Application number: CN 200510084548
Authority: CN
Inventors: G·施塔莱克; P·布兰肯霍恩
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2004-07-26
Filing date: 2005-07-26
Publication date: 2006-02-01
Also published as: DE102004037492A1; TR200502604A2; ITMI20051271A1

Abstract

A conveyor leather ring on a spinning machine drafting device is used to convey a pneumatic fiber fringing to be compacted. At least one row of eyelets which is in the form of a bead chain and is distributed according to the conveying direction is arranged on the conveyor leather ring. And material capable of reducing electrostatic charge is arranged on the surface of the conveyor leather ring.

Description

The conveying apron that drafting device for spinning machine is used

The present invention relates to a kind of conveying apron of carrying one to treat pneumatic fibre sliver of being used for of drafting device for spinning machine, apron has the hole that pearl chain that at least one row distributes by throughput direction can be breathed freely.

If one the fiber strip of drawing-off on spinning machine, be close to drafting system delivery roller to the turn that spins, on the right jaw line of delivery roller, form a so-called spinning triangle then.Like this, the yarn of drawn fiber of band Rack leaves drafting system and twists into carefully yarn of diameter.Spinning triangular zone contains the unordered edge fiber that enrolls in the twisted yarn, thereby seldom or be helpless to the intensity of resultant yarn.For this reason, people more and more tend to the so-called compacting zone of arranged downstream to the draw zone of drafting system in recent years, and it is limited by a jaw line of outlet side.Yarn is through the twisting of promptly spinning behind the jaw line.Fiber carries out boundling or compacting in compacting zone, and fiber strip attenuates when leaving nearest jaw line like this, causes fearful spinning triangular-defects no longer to seem important.The yarn that is spun into becomes evenly, intensity is better and filoplume still less.

The device of very different compacting one one fiber strands is known.Many this devices are to use a ventilative conveying apron job, and the inspiratory airflow of compacting fiber strand was walked this conveying apron.The device of above-mentioned this conveying apron, for example open in German patent DE 197 58 758 C2.According to this patent specification, carry apron to be provided with the eyelet of a row by the pearl chain of throughput direction.

Because this conveying apron is with rubber or plastics manufacturing and through being usually used in carrying the ribbon that contains composite fibre materials, thereby has this danger, promptly carries apron to produce electrostatic charge.Write in the above-mentioned patent specification, the compacting effect is to be affected along with long back of time, and promptly flyings and dust stop up air path.Eyelet row also may reduce its gas permeability because of the accumulation of dust.Along with the time is permanent, the blockage effect of fiber strip reduces like this.Because this is a process of variation gradually, thus be extrahazardous, the compacting effect weaken often that the stage just can be found very late.

Task of the present invention is to improve above-mentioned this conveying apron, makes it no longer include aforesaid shortcoming.

The solution of this task is to carry the surface of apron to add the material that reduces electrostatic charge.

Can carry apron to produce electrostatic charge from initial just the prevention, perhaps these electrostatic charges be reduced to harmless amount in the reality by conductive discharge.Carry the dust or the flyings that adhere on the apron to be reduced to a great extent like this, make the gas permeability of carrying apron not be subjected to the electrostatic charge influence at least.

Can be with very different modes and the additional material that reduces electrostatic charge of method.

The apron surface can be coated.For example can adopt a kind of conductive layer of carbon based material.In the another kind of selectable scheme, with a kind of plasma coating of conduction on the apron surface.Particularly advantageous is that a kind of like this coating is by generating in surperficial coated with metal.For example a kind of silver layer that is in the micrometer range can be coated in to be carried on the apron surface, and its floating coat should be very thin, does not influence eyelet row's gas permeability.Only under the situation of using a kind of polyamide as the material of carrying apron, could use this silver coating.

Also have another technical scheme according to the present invention at last, but promptly carry the surface of apron to make it to have electric conductivity through a kind of chemical finishing.

Other advantages of the present invention and feature can be learnt from the explanation of a following embodiment.

The partial side view in cross section of a drafting device for spinning machine of Fig. 1, described drafting device for spinning machine dispose a postposition, have a compacting zone according to conveying apron of the present invention;

Relative Fig. 1 of Fig. 2, press the enlarged drawing of the compacting zone of arrow II direction among Fig. 1;

Very large enlarged drawing of Fig. 3 according to the cross section of conveying apron of the present invention.

Fig. 1 illustrates a drafting device for spinning machine 1, and it comprises three pairs of driven bottom rolls 2,3 and 4, and these bottom rolls are placed on the vertically continuous axle of machine by known way.The top roller 5,6 and 7 that is designed to pressure roller is attached troops to a unit in bottom roll 2,3 and 4.Middle bottom roll 3 and middle top roller 6 dispose a following apron 8 or a upper leather ring 9.Bottom roll 4 and the top roller 7 common delivery rollers of drafting system 1 of forming are to 10.At delivery roller 10 jaw line 11 is finished drawing-off by rove or fiber strip 12 that throughput direction A carries.

To 10 a drawing-off, the fiber strips 13 of spinning twisting are as yet arranged from delivery roller, it by throughput direction B enter a twisting mechanism, for example a ring ingot and twist into a yarn 14 before, should be directly in the downstream of drafting system 1 through a compaction treatment.

Compacting zone 15 is in drafting system 1 downstream, and purpose is fiber strip 13 compactings with drawing-off, makes the edge fiber that also protrudes out abut on the nuclear core of fiber strip 13.Spinning triangular zone diminishes and has improved utilizing degree and improving the intensity of yarn and reduced scared degree of 14 the material of waiting to spin like this.

Can see from enlarged drawing 2 that in addition compacting zone 15 disposes a getter device 16, the latter has the vacuum chamber 17 of a sealing.Described getter device 16 has a fixing sliding surface 18 to be used as the slide-and-guide of carrying apron 19, and this carries apron to carry the fiber strip 13 of compacting by compacting zone 15.

Carry apron 19 that the eyelet 20 of the pearl chain that a row distributes along throughput direction A is arranged in the central, this eyelet also plays pneumatic compaction except fiber strip 13 being stabilized in carry on the apron 19, and this puts everybody and learns from the prior art of quoting previously.Conveying apron 19 fiber strip 13 of drawing-off is delivered to by a delivery roller the 22 supply jaw lines of forming 21.This supply roller is to comprising a driven supply bottom roll 23 and a supply top roller 24 that is designed to pressure roller, and the latter is transferred apron 19 and twines, and therefore drives and carries apron 19.

Getter device 16 is equipped with a vacuum connection tube 25, and the latter produces one by eyelet row 20 air-flows that flow into, that make fiber strip 13 compactings.Eyelet row 20 bore dia is equivalent to the degree of the compacting that requires.Inspiratory airflow can flow in the vacuum connection tube 25 by an air-breathing slit 26.

As mentioned before, dust or flyings may anchor on the conveying apron 19, and they not only stop up eyelet row 20 along with the time, but also easily are wrapped in the wearing and tearing of supplying with on the top roller 24 and increasing conveying apron 19.The patent applicant thinks that these shortcomings mainly are when fortune owing to carry the electrostatic charge of apron 19 to cause when producing.

Can describe in detail by very large enlarged drawing 3, above-mentioned these shortcomings can be by getting rid of according to conveying apron 19 of the present invention.

According to the present invention's regulation, the material that reduces electrostatic charge is added on the surface 27 of carrying apron 19.This point can realize for the shallow layer 28 of apron material 29 coating electrically conductives afterwards.The thickness of this coating 28 should be in micrometer range, and surface 27 is coating as far as possible all, and does not make eyelet row 20 hole cross section reduce greatly.Can be used as having of coating 28 uses, such as graphite linings, plasmasphere or a kind of metal coating.Particularly use under the situation of polyamide as apron material 29, it is very practical for example coating silver coating thin as skin, and particularly a kind of metal spraying technology that is combined as the basis with polyamide-Yin can be given and be carried apron 19 favorable mechanical performances.Can make the silver layer 28 of taking root in polyamide have extremely strong adhesiveness.

Actual showing, above-mentioned this according to conveying apron of the present invention after long period operation, itself is no longer stopped up eyelet by dust or flyings, and prevents the shortcoming that is associated therewith, such as the group of formation or twine roller.

Claims

1. be used for carrying the conveying apron (19) of the fiber strip (13) of a pneumatic compacting on the drafting device for spinning machine (1), one row is set at least along throughput direction (A) eyelet (20) that distribute, that the pearl chain can be breathed freely on this conveying apron, it is characterized in that, carry the surface (27) of apron (19) to add the material that can reduce electrostatic charge.

2. according to the conveying apron of claim 1, it is characterized in that surface (27) is coated.

3. according to the conveying apron of claim 2, it is characterized in that surface (27) is by metal spraying.

4. according to the conveying apron of claim 2, it is characterized in that coating (28) is used carbon based material.

5. according to the conveying apron of claim 2, it is characterized in that the conductive plasmasphere of one deck (28) is applied on the apron surface (27).

6. according to the conveying apron of claim 1, it is characterized in that surface (27) makes it have conductibility by chemical finishing.