CN1018740B

CN1018740B - Device for severing yarn during spool exchange, especially on open-end spinning machines

Info

Publication number: CN1018740B
Application number: CN89108020.1A
Authority: CN
Inventors: 兹比内克·文高尔; 阿莱斯·曼内克
Original assignee: Elitex Liberec
Current assignee: Elitex Liberec
Priority date: 1988-09-14
Filing date: 1989-09-14
Publication date: 1992-10-21
Also published as: DE3929406C2; IT1231829B; CN1042200A; CH680453A5; CS613288A1; IT8921639A0; DE3929406A1; CS269411B1

Abstract

Apparatus for attachment to the service robot of an open-ended spinning frame which is employed to exchange the full reels of yarn and empty tubes, having an air extraction section running in proximity to the reeler, in such a manner that when the reel is full, the yarn is drawn into a tube and separated there by a rapidly rotating shear.

Description

Device for severing yarn during spool exchange, especially on open-end spinning machines

The present invention relates to particularly having a plurality of spinning positions by can be the time in order to cut off the device of yarn along spool exchange, especially on open-end spinning machines that the automatic controller that this station moves is kept an eye on.

Hitherto known this class device all be mounted near in order to when the uninterrupted delivered yarn of spinning machine spinning unit to mound bobbins doff that has been rolled up and the automaton place that changes bare bobbin, and before the mound bobbins doff that will be rolled up, to cut off the yarn that arrives mound bobbins, guide the yarn of supplying with from spinning unit on one side then incessantly, at this moment fall the yarn spool-holder tube that is rolled up and change empty bobbin.

Desire on the automatics of keeping an eye on to cut off yarn and used according to tradition and have a fixing shearing blade and another is the mechanism of the scissors principle work of transportable blade, as disclosed Czech patents (inventor's certificate) No 203112.A kind of device roughly the same is shown in the Czech inventor certificate No 241804, two blades of opposition are mutually arranged on the cut-out parts by the setting of fixed cutting tool principle, so be arranged so that and staying a narrow slit to lead to an intermediate space that on the air intake duct introducing direction of motion, opens wide between its blade.

The common drawback of these two kinds of devices is that the blade of scissors and blade always has on the fixed point and is worn, and therefore is easy to allow those ends to be cut off tangle through the yarn line segment of finishing fully.

For this reason, once suggestion is directly installed on cutter fixing in the channel of suction pipe with one, as disclosed Czech inventor certificate No 167684, attempt is when yarn oppositely draws such as yarn when being wound body and blocking, be selected on certain position with fixing cutter and cut off yarn, so that guaranteeing the yarn reservation is wrapped on the reel, but the result of use of this fixed tools is not good, and the air-flow along the cutter place can hinder yarn near blade in the road because inhale when the yarn fold return motion, therefore, sometimes the cut-out of yarn is also unreliable, in addition, and about the intrinsic elastic problem of yarn, the thickness problem can not guarantee the instantaneous trip yarn in necessity.

On the disclosed a kind of device of Czech inventor certificate number No236009 same shortcoming is arranged also, this device is equipped with the draw-gear of a yarn on each operating position.This keeping an eye in the operating process at the automatic controller of keeping an eye on, be used for device by the yarn that suction pipe sucked of the automatic controller of keeping an eye on, it is characterized in that a rotating circular disk on band sword limit on its periphery cooperates one in order to suck from the yarn of draw-gear and to be positioned at sleeve on the axis of cut-out dish, so that be used for cutting off the yarn of making fold return motion.The cutting edge limit equally keeps constant with yarn and contacts in this device, causes the passivation effect of certain degree.The major defect of this device is a poor reliability, and blocks easily, so that influence is equipped with the effective service behaviour with the whole system of keeping an eye on of this cutter sweep.

Purpose of the present invention is exactly the intrinsic shortcoming that overcomes the principle of above-mentioned known wire-cutting device, makes to cut off yarn and become in time, reliably and not blocked.

According to the present invention, the chopped strands task can solve with a device that cuts off yarn when the yarn tube of changing on the free-end spinning machine particularly have a plurality of spinning positions, this spinning position is kept an eye on by the automatic controller that moves along it, and this spinning machine has the mechanism of a mound bobbins doff that will be rolled up, promptly replace in order to take off this reel that is rolled up from winder station and to insert new bobbin, to receive the yarn that will be wound on this bobbin, this yarn was increased its length by suction pipe before changing reel, it is characterized in that, the through hole rotational sleeve that drives independently of a yarn is installed on the yarn journey section of coiler device back, in these sleeve-ports, is had at least a sleeve-port to provide with an annular cutting edge limit.

Play a part discharge in order to the tube of the low-pressure air of catching and feeding yarn to be processed in installation in establish the cut-out parts, when yarn stops or beginning catadioptric motion, has the effect that yarn is stretched, thereby, force yarn to arrive the round cutting edge limit of rotation, and cut off this yarn reliably.

In order to ensure when suitable, being carved with the good condition of chopped strands reliably, according to the present invention, be preferably in one or more sweeps are set on the suction pipe, yarn is close on the tube wall, and stops the yarn fold return motion.A kind of such sweep is positioned at that back, subcircular cutting edge limit is good more more, can guarantee to be close to rotation cutting edge limit like this when yarn is subjected to stretching, and guarantees chopped strands reliably.

As an example, one embodiment of the present of invention are shown in the side-looking that wire-cutting device is shown and cut open in the accompanying drawing of figure.

Wire-cutting device comprises suction blast pipe 1, and it has a round cutting edge limit 3, and this cutting edge limit 3 is installed on the turnbarrel 2, and this sleeve 2 is installed in the bearing 5 that is used to rotate, and passes through belt 13 driven rotary by motor 6 independently.

The concrete operation of the device of present embodiment is as follows:

Replace around full bobbin with the bobbin of sky, the mound bobbins doff that the automatic controller of keeping an eye on will be rolled up, and yarn is separated from bobbin.The yarn 7 that still is stretched from spinning unit is sucked blast pipe 1 and catches, and is transported to assembling with the low pressure source garbage collector 9 of a ventilator for example by air-flow by the direction shown in the arrow 8.As long as be provided to yarn 7 one interruptions of suction aiutage 1, or yarn 7 begins to make fold return motion by the direction of arrow 10, yarn 7 just is stretched, the round cutting edge limit 3 and cut off by live part 4 just yarn 12 reclines.

Yarn 12 to be abutted in the live part 4 on cutting edge limit 3, make yarn 12 form the tensioning states condition that is absolutely necessary.It is this that should to stop or beginning the tensioning state that moment of fold return motion occurs at yarn 12 be by a bend pipe 11(sweep is provided) make yarn 12 be adjacent to the tube wall of suction blast pipe 1 and on the direction of arrow 10, stop the fold return motion backward of yarn 12 to realize.This bend pipe 11 is to provide on the direction that flows because of the swabbing effect air in the back of turnbarrel 2 on the suction blast pipe 1.

Claims

1, a kind of device of changing cut-out yarn when the bobbin on the free-end spinning machine with at least one winder station of feeding yarn of on bobbin, reeling continuously, this device comprises a suction blast pipe, when change of bobbins more, yarn is drawn in this suction tracheae, the rotating knife that also comprises a drive, in order to cut off with continuing to be wound up into the yarn of replacing on the bobbin, this suction blast pipe has at least one sweep, it is characterized in that this rotating knife has the through hole that passes through for yarn, this through hole is positioned at contiguous this bend office, so that during the tensioning yarn, yarn is pressed against on this rotating knife, and this rotating knife comprises a circular cutting member on the turnbarrel that is installed in the part that forms this suction blast pipe.