CZ292067B6 - Process and apparatus for spinning yarn on spindleless spinning machines - Google Patents

Abstract

In the present invention there is disclosed a process for spinning on a rotor spinning machine wherein the process is characterized in that after spinning in and at the furthest at the instant at which draw-off of the yarn begins, vacuum is applied to the yarn (32) within the space between a draw-off mechanism (4) and winding up mechanism (9) to thereby causing sucking the formed yarn (32) loop into a vacuum tube (10) of a work station. After operation winding up velocity is achieved, the yarn (32) loop is consumed within the vacuum tube (10) and the vacuum action on the yarn (32) terminates. This process can be applied for all rotor spinning machines, as well as apparatus having arranged on each work station and next to the yarn (32) path between the draw-off mechanism (4) and winding up mechanism (9) a suck-in opening (101) of a vacuum tube for spun yarn, whereby said vacuum tube (10) forms a part of the work station of the rotor spinning machine and is controllably connectable to a vacuum source (104).

Description

Method and apparatus for spinning yarn on open-end spinning machines

Technical field

The invention relates to a method of spinning yarn on rotor spinning machines, both on machines provided with a service device which carries out the steps of preparing the yarn and the spinning rotor for spinning, and on machines in which the steps of preparing the yarn and the spinning rotor for spinning are performed manually.

The invention further relates to a yarn spinning device on open-end spinning machines comprising a plurality of juxtaposed work stations, each comprising a yarn spinning unit, a yarn draw-off device and a yarn winding device.

BACKGROUND OF THE INVENTION

When spinning on open-end spinning machines, the yarn withdrawal from the rotor and the yarn winding due to the different yarn draw-off speed and yarn winding start release the yarn between the yarn draw-off device and the yarn winding device. the risk that the yarn, which at this initial spinning phase does not have sufficient tension during winding, is wound on the bobbin surface in loops. Such a coil with loops complicates the further processing of the yarn and leads to defects of the finished products, for example during dyeing or causes, due to fluctuations in tension, during the unwinding of the yarn breakage.

This drawback is eliminated in automatic spinning machines provided with a service device, for example, after spinning by means of the service device, the yarn withdrawal and winding by the service device is started, while the speed of at least the winding device of the service device is controlled. the yarns transfer the machine's drawing-off and winding device to the machine and the service device can be moved to operate the next working station. This process extends the working time of the work place, which in the case of highly productive machines means the need to deploy a larger number of service devices to operate the machine.

This problem is not solved at all on manually operated or semi-automatic spinning machines, which reduces the quality of the yarn especially in semi-automatic spinning machines where the operator only manually cleans the rotor and prepares the yarn for spinning, ie unwinding and measuring the required yarn length and yarn guidance. into the spinning-in means of the working place of the machine. All other piecing steps, including their synchronization, are performed by means of the workstation and / or machine control means. However, the formation of loops after spinning as a result of the yarn loosening between the draw-off and take-up device of the work station cannot be prevented by varying the draw-off or take-up speed, since these are fixed by the machine design.

SUMMARY OF THE INVENTION

The aforementioned disadvantages of the prior art are reduced or completely eliminated by the yarn spinning method of the rotor spinning machines according to the invention, which consists in that, at the latest at the start of the yarn withdrawal, a vacuum is applied to the yarn suction opening of the vacuum tube of the working station. resulting from the yarn loosening between the take-off device and the winding device due to an insufficient winding speed in the initial spinning phase, and after reaching the working winding speed, the yarn loop in the vacuum tube begins to shrink and

The vacuum depressures are eliminated, thus preventing the loop from the selected yarn being deposited in the resulting winding and thus increasing the yarn quality parameters.

By sucking the yarn into the vacuum tube of the rotor spinning machine workstation in the initial spinning phase, sufficient yarn tension is maintained for winding. This method can be applied to all rotor spinning machines, and application to machines operated only manually can be considered superfluous, in particular due to the low and variable quality of the spinning machines achieved on these machines.

The method according to the invention is particularly applicable to semi-automatic rotor spinning machines, in which the steps of preparing the rotor and the spinning yarn are carried out manually and the final spinning steps are carried out by means of the machine work station. very desirable from the point of view of further processing of the yarn.

The method according to the invention can also advantageously be used on semi-automatic or automatic rotor spinning machines in which at least some of the final spinning steps are initiated or performed synchronized with respect to the closing of the spinning unit.

The method according to the invention can also be used on automatic rotor spinning machines provided with a service device which performs all the steps of preparing the yarn and the spinning rotor for spinning and the final spinning steps including at least starting the feeding of the fibers into the spinning rotor. The principle of the method is that, at the latest at the time of starting the yarn withdrawal, the service device commands the vacuum to the suction opening of the yarn of the vacuum tube of the work station, and after completing the final piecing steps the service device terminates its operation. while the yarn between the take-off device and the winding device is subjected to a vacuum from the suction opening of the vacuum tube yarn and The yarn loop formed by the yarn loosening between the draw-off device 30 and the winding device due to insufficient winding speed in the initial spinning phase is sucked into the vacuum tube and when the working winding speed is reached, the yarn loop in the vacuum tube starts to shrink. a vacuum of the workstation tube, thereby reducing the operating time of the workstation by the operator and increasing operator productivity while maintaining complete automation of spinning and spinning quality and yarn winding.

The device according to the invention is characterized in that a suction opening of the vacuum tube for the spun yarn is arranged at each work station beside the yarn path between the take-off device and the winding device, the vacuum tube being part of the rotor 40 spinning machine working station and controllable to the vacuum source. This arrangement makes it possible to maintain sufficient yarn tension even in the initial spinning phase and prevents loops on the spool being wound. The arrangement according to the invention is applicable on automatic spinning machines with a service device, on semi-automatic spinning machines as well as on manually operated spinning machines.

The vacuum tube is preferably connected to the vacuum source by means of a valve that is coupled to the control unit, wherein the valve (102) is common to at least two workpieces of the machine, thereby saving production costs of the machine, or This further increases the cost of manufacturing the machine, while paying attention to the design of the sufficient vacuum in the exhaust system.

-2 CZ 292067 B6

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 shows a cross-sectional view of a workstation arrangement in a machine; Fig. 2 shows a front view of a workstation arrangement according to Fig. 1; 4 shows an embodiment of the invention with one valve for the entire machine section. FIG.

DETAILED DESCRIPTION OF THE INVENTION

The rotor spinning machine comprises a plurality of workstations arranged side-by-side, each workstation constituting a unit which separately manufactures the yarn from a sliver of textile fibers and winds the produced yarn onto a bobbin. The device according to the invention will be described on a semi-automatic spinning machine according to CZ patent 284 295.

Each work station comprises a spinning unit 1, under which a sliver 2 is placed, from which the sliver 3 of textile fibers is fed to the feeding device 11 of the spinning unit 1, which comprises a feed coupling 111 coupled to the control unit A. a device 12 for splitting the strand 3 into individual fibers. The opener 12 is associated with an opener fiber transport channel 13, which opens into the interior of the spinning rotor 14, at its widest point being a collecting groove 141 to collect the opener fibers into the fiber ribbon 31 due to the centrifugal force of the rotating spinning rotor 14 .

The fiber ribbon 31 is transformed in a known manner into a yarn 32, which is discharged from the spinning rotor 14 via a discharge tube 15, from which it is led through a yarn quality and presence sensor 6 to a draw-off device 4. a roller 42, which is mounted on the pressure lever 43 and abuts the periphery of the respective take-off roller 44 in the working position. In the folded-out position, the circumference of the pressure roller 42 is distant from the periphery of the take-off roller 41. The pressure lever 43 is coupled to the actuating solenoid 5. with control unit A.

From the draw-off device 4, the yarn 32 is guided through the yarn presence sensor 7 and the known yarn distributor 8 into a winding device 9 which comprises a continuous drive roller 91 along the length of the machine, to which a winding spool 92 is pressed. the bobbin holder arms 94, which are arranged in a known manner, hinged from the drive roller 91 of the winding device 9, to interrupt the winding of the yarn 32, i.e. to stop the rotation of the bobbin 92 when the spinning process is interrupted. Said bobbin holder arms 94 are simultaneously openable from one another for removing the wound bobbin 92 and inserting an empty tube 93 between said bobbin holder arms 94. The yarn presence sensor 7 is coupled to the control unit A. The spool holder arms 94 are coupled to the control solenoid 5, in the illustrated embodiment by means of the second control rod 52.

The device further comprises a piecing deflection member 20 coupled to the piecing deflection electromagnet 201, which is coupled to the control unit A. The piecing deflection member 20 is disposed between the outlet opening of the discharge tube 15 and the exhaust device 4 and the yarn quality and presence sensor 6 respectively. deflecting the yarn 32 to form a yarn reserve for spinning, and at the same time releasing the yarn reserve upon initiation of the piecing process and lowering the piecing end of the yarn 32 onto the collecting groove 141 of the spinning rotor.

-3GB 292067 B6

FIG. 1 shows the work station control unit A. In Fig. 2, the work station control unit A is connected to the machine section control unit AA, which is connected to the AAA machine control unit. The invention is described by way of example in which the control unit of the device is the work station control unit A. However, in the above and below described embodiments 5, the machine control unit may also be the machine section control unit AA and / or the machine AAA control unit. Thus, the above-described control unit A means the work station control unit A and / or the machine section control unit AA and / or the machine control unit AAA.

Between the take-off device 4 and the winding device 9, a suction opening 101 of the vacuum tube 10 is situated near the yarn path 32, which is connected via a valve 102 to a vacuum port 103 situated along the respective side of the open-end spinning machine. which is a vacuum pump or fan. The valve 102 is coupled to the control unit A. According to the embodiment shown in Figs. 1 and 2, the valve 102 is mounted at each workstation of the machine and serves to individually connect the vacuum tube 15 of each workstation.

The valve 102 may, according to other embodiments, be common to two or more workstations as shown in Figs. 3 and 4. In the embodiment of Fig. 3, the valve 102 is common to the vacuum tubes 10 of two adjacent workstations and is coupled to the control units. And both workstations are connected, or it is coupled to the machine section control unit A. In the embodiment of FIG. 4, there is a valve

102 common to the whole machine section and vacuum tubes 10 of all workstations of the respective machine section are connected thereto, for control, the valve 102 is coupled to the control unit A of the respective machine section and / or the machine control unit and / or the work unit controllers relevant sections of the machine.

At the start of the spinning process, which is carried out on the rotor spinning machine by any of the known methods corresponding to the machine construction, the spinning end of the yarn is lowered into the spinning rotor 14 and reached the collecting groove 141, connected to the fiber ribbon 31. 1 and 2, the valve 102 is opened and connected to the vacuum source 104 to the vacuum source 104 based on the instruction given by the control unit A and connected to the vacuum tube 10 of the spinning station. . Since the yarn winding speed is less than the yarn winding speed shortly after the spinning-in and yarn withdrawal 32 from the rotor 14 and the winding of the yarn 32 onto the bobbin 92, in the initial phase in advance, the excess amount of yarn 32 is sucked in into the vacuum tube 10, thereby preventing loops of wound yarn 32 and winding such loops on the spool 92, and maintaining sufficient yarn tension for winding. Upon reaching the operating speed of the bobbin 92 in the winding device 9 at which the yarn winding speed is slightly higher than the yarn draw-off speed, the yarn loop 32 from the vacuum tube 10 is gradually consumed until complete consumption. Subsequently, the valve 102 disconnects the vacuum tube 10 from the vacuum source 104 upon command of control unit 40.

The control unit A commands the vacuum tube 10 to be disconnected from the vacuum source 104, preferably after a predetermined period of time from the start of the piecing time, which is assumed to be consumed with sufficient time for all the yarn 32 that has been sucked into the vacuum tube 10. so that there is no danger of loops when the yarn is wound 32.

Also known in the vacuum tube 10 can be a known yarn presence sensor that will communicate with the control unit A, which commands the vacuum tube 10 to be disconnected from the vacuum source 104 after all the yarn 32 has been consumed from the vacuum tube 10.

In the embodiment of FIG. 3, the vacuum tube 10 of the spinning unit is connected to the vacuum source 104 during the piecing process and the vacuum tube 10 of the adjacent spinning unit is connected to the same valve 102. the selected yarn 32 is sucked into the suction opening 101 of the vacuum tube 10, while at the same time

The vacuum of the suction opening 101 of the vacuum tube 10 does not adversely affect the winding of the yarn 32, the yarn 32 is continuously wound onto the spool 92 and is not sucked into the vacuum tube 10.

In the embodiment of FIG. 4, all the vacuum tubes 10 of the workstations of the entire machine section are connected to the vacuum source 104 during piecing, and only the piecing yarn 32 is sucked into the suction opening 101 of the vacuum tube 10 at the piecing station. the connection of the vacuum tube 10 to the vacuum source 104 takes place in the embodiment of FIGS. 3 and 4 as described in the embodiment of FIGS. 1 and 2.

The use of the yarn spinning device 32 with the vacuum tube 10 according to the invention is not only dependent on the described embodiment of the semi-automatic spinning machine, but is possible and expedient also on other embodiments of the semi-automatic spinning machines, eg according to CZ Pat. 284 729 or EN UV 10 295. The yarn spinning device with a vacuum tube 10 can also be used on manually operated machines in which the valve is switched on and off by the operator or the valve is switched on by the operator and coupled to a timer to stop it.

Likewise, the yarn spinning device with the vacuum tube 10 according to the invention can also be used on automatic open-end spinning machines operated by a service device. In these machines, the yarn spinning device with the vacuum tube 10 makes it possible to simplify the service device and, in particular, to shorten the time period for which the service device must be present at the work station being serviced. The service device is displaceably disposed along the workstations of the machine and is provided with means for performing at least some of the activities required to recover the spinning at the work station where the spinning is required. The servicing device carries out the steps of preparing the spinning rotor 14 for spinning, which is opening the spinning unit 1, cleaning the spinning rotor 14 and closing the spinning unit 1, and the steps of preparing the spinning yarn 32, which include locating the yarn end 32 on the bobbin 92. the yarn 32, forming the spinning-in end of the yarn 32, guiding it into the discharge tube 15 of the spinning unit L After performing the steps of preparing the yarn 32 for spinning, the yarn 32 is usually stored partially in the respective work station means and partly in the respective means of the service device. After the pre-spinning steps have been completed, the service device begins the final spinning steps, which include at least initiating the introduction of the yarns into the spinning rotor 14, lowering the yarn end of the yarn 32 to the collecting groove 141 of the rotor 14 and starting yarn withdrawing and winding 32. Typically, once the fiber sliver 3 is started to feed into the opener device 12, the strand beard fibers outside the spinning rotor 14 are removed by any known method. At the latest at the start of the yarn withdrawal 32, the control unit commands a vacuum to the yarn suction opening 101 of the vacuum tube 10 of the working station, i.e., a valve 102 to connect the vacuum tube 10 to the vacuum source 104 so that the force between the take-off device 4 and the take-up device 9 and the excess yarn 32 between the take-off device 4 and the take-up device 9 resulting from insufficient winding speed in the initial spinning phase is sucked through the suction port 101 into the vacuum tube 10 forming a yarn loop. Upon reaching the working winding speed, the yarn loop in the vacuum tube 10 begins to shrink until completely consumed. After the yarn 32 has been consumed, the connection of the workpiece vacuum tube 10 to the vacuum source 104 is terminated. After completing the final piecing steps and commanding the vacuum to the suction opening 101 of the vacuum tube yarn 10 and passing the yarn 32 to the work station means, the attending device terminates its operation at the work station being serviced and is ready to be moved to the next work station. Thus, the service device saves the time it would otherwise devote to adjusting the ratios at the workstation in the initial piecing phase in order to achieve steady ratios between the amount of yarn being withdrawn and the yarn being wound.

The invention is not limited to the described embodiments, but also includes combinations of these embodiments and equivalents thereof.

Claims (6)

PATENT CLAIMS A method of spinning yarn on rotor spinning machines provided at each station with means for performing the final spinning steps, wherein the steps of preparing the spinning rotor for spinning and the steps of preparing the spinning yarn are performed manually, wherein the command to initiate the final spinning steps comprising at least threading into the spinning rotor, lowering the spinning end of the yarn to the spinning rotor collecting groove and starting the yarn withdrawal and winding, the operator gives manually and the final spinning steps are performed by the appropriate means of the machine workstation. 32), a vacuum is applied to the suction opening (101) of the yarn of the vacuum tube (10) of the work station into which the yarn loop (32) formed between the draw-off mouth is sucked by the winding device (4) and the winding device (9) due to insufficient winding speed in the initial spinning phase, and when the working winding speed is reached, the yarn loop (32) in the vacuum tube (10) starts to shrink. ) terminates the vacuum working station, thereby ensuring sufficient yarn tension during winding in the initial spinning phase and avoiding the placement of the loop from the selected yarn (32) in the resulting winding and thereby increasing the yarn and winding qualities. 2. A method of spinning yarn at a rotor spinning machine station, comprising the steps of preparing the yarn for spinning, the steps of preparing the spinning rotor for spinning, and the final spinning steps comprising at least initiating feed of the fiber sliver to the opener. time interval, starting the yarn spinning end on the spinning rotor collecting groove and starting yarn withdrawal and winding, wherein the final spinning steps synchronization is performed with respect to the moment of closing of the spinning unit and / or the moment of opening of the spinning unit and / or selected moment during closing spinning unit, characterized in that, at the latest at the moment of starting the yarn withdrawal (32), a vacuum is applied to the yarn suction opening (101) of the vacuum tube (10) of the working tube at the point where the yarn loop (32) sucks between the take-off device (4) and the winding device (9) is sucked due to insufficient winding speed in the initial spinning phase and after reaching the working winding speed, the yarn loop (32) in the vacuum tube (10) begins to shrink and, when consumed, the connection of the vacuum tube (10) of the workstation to the vacuum is terminated, thereby ensuring sufficient yarn tension during winding in the initial spinning phase and avoiding loosening of the looped yarn (32) into the resulting winding thus the qualitative parameters of yarn and winding. 3. A method of spinning yarn on rotor spinning machines provided with a service device displaceably arranged along the machine workstations and capable of performing at least some of the spinning steps at a workstation requiring a service where the spinning rotor spinning rotor and spinning rotor spinning steps are performed. wherein the service device guides the yarn to its pre-spinning position at the workstation, and a portion of the yarn remains in the spinning means of the service device, which then initiates the final spinning steps, including at least commencement of feeding the yarns into the spinning rotor; rotor and starting the yarn withdrawal and winding, characterized in that at the latest at the moment the yarn withdrawal starts e (32), the control unit commands the vacuum to the suction opening (101) of the yarn of the vacuum tube (10) of the work station, and after completing the final piecing steps the control unit terminates its operation at the work station being operated. the winding device (4) is subjected to a vacuum from the suction opening (101) of the vacuum tube yarn (10) and the yarn loop (32) formed by loosening the yarn (32) between the draw device (4) and the winding device (9) in as a result Insufficient winding speed in the initial spinning phase is sucked into the vacuum tube (10) and when the working winding speed is reached, the yarn loop (32) in the vacuum tube (10) begins to shrink and when the vacuum tube ( (10) a vacuum working station, thereby reducing the operating time of the working station by the service equipment and increasing operator productivity while maintaining complete automation of spinning recovery and the quality of the spinner. An apparatus for carrying out the method according to any one of claims 1 to 3 on rotor spinning machines comprising a plurality of side-by-side working stations each comprising a yarn spinning unit, a yarn draw-off device and a yarn winding device, characterized in that The suction opening (101) of the vacuum tube for the spun yarn is arranged next to the yarn path (32) between the take-off device (4) and the winding device (9), the vacuum tube (10) being part of the rotor spinning machine working station. to a vacuum source (104). Device according to claim 4, characterized in that the vacuum tube (10) is connected to the vacuum source (104) by means of a valve (102) coupled to the control unit (A), wherein the valve (102) is common to at least two work stations of the machine. . Apparatus according to claim 4, characterized in that the vacuum tube (10) is connected to the vacuum source (104) by means of a valve (102) coupled to the control unit (A), wherein the valve (102) is common to the work stations of one machine section. .