CZ284295B6 - Process of yarn individual spinning on a rotor spinning machine spinning station and apparatus for making the same - Google Patents

Abstract

The individual yarn spinning (32) at the working position of the rotor spinning machine is carried out by manually locating the yarn end (32) by hand on the raised bobbin (92), manually measuring the yarn length (32) required for spinning and at the end of the yarn spinning machine (32). it forms a piecing end of the yarn (32) which is introduced into the discharge tube (15) of the spinning rotor (14). Prior to spinning, the yarn (32) is introduced into its working path at the working position of the rotor spinning machine, passing between the draw-off roller (41) and the pressure roller (43) which is opened by it and deflected from its working path by at least one deflecting means (10, 20) of the spinning machine working station, passing out of the distribution device (8), and then releasing the deflecting member (10, 20) of the spinning end of the yarn (32) on the collecting groove (141) of the spinning rotor (14) on which a thread (31) has been previously formed to be joined thereto, whereupon the yarn (32) begins at a predetermined point in time.

Description

Technical field

BACKGROUND OF THE INVENTION The present invention relates to a method of individually spinning yarn at a rotor spinning machine in which the picked bobbin is first manually scanned for the yarn end, the yarn length required for spinning is manually measured and formed at the end of the yarn. rotor.

The invention further relates to an apparatus for carrying out said method on an open-end spinning machine, each station comprising a spinning unit with a sliver, a spinning rotor and a yarn removal tube, over which a draw-off device comprising a take-up roller and a pressure roller mounted on the pivotable pressure lever, the yarn distributor and the yarn winding device, in the arms of which the bobbin is arranged, further comprising a control unit which is connected to the fiber sliver feeding device.

BACKGROUND OF THE INVENTION

The spinning unit of the rotor spinning machine comprises a fiber sliver feeding device, which is followed by a fiber opener device, from which the fibers are fed under negative pressure into the inner space of the spinning rotor, where they are collected on a collecting groove. transforms into yarn. The produced yarn is withdrawn from the spinning rotor by an outlet tube, it is withdrawn by the take-off rollers and in the winding device it is wound on a spool. The presence of yarn between the outlet tube and the winding device is monitored by a sensing device which, in the event of a yarn breakage, emits a signal to stop at least the sliver feeding device.

Restoring the spinning process is called yarn spinning and is a process in which the end of the yarn is introduced upstream of the yarn exit tube into the spinning unit outlet tube and lowered to the collecting groove of the rotating spinning rotor. a fiber ribbon was formed in the groove of the spinning rotor. After the end of the yarn has been attached to the fiber ribbon, the yarn withdrawal is started and the yarn is produced from said fiber ribbon.

The piecing can be carried out either manually or automatically by some of the known devices which have been solved for this purpose.

In the case of manual spinning after the yarn break, the operator first tilts the bobbin from the drive roller and looks for the yarn end on the bobbin, unwinds the necessary yarn length and introduces the yarn end into the spinning unit outlet tube into which the yarn end is sucked under vacuum. After the end of the yarn has been introduced into the exit tube of the spinning unit, the operator tilts the spool in the winding device to the working position, where the spool bears against the drive roller. During this movement, the operator resumes feeding of the filaments to the spinning rotor.

When the end of the yarn reaches the spinning rotor collection groove, fibers from the fiber ribbon begin to attach thereto and the bobbin, upon contact with the drive roller, begins to rotate and the newly formed yarn begins to be withdrawn from the spinning rotor and wound onto the bobbin. The operator does not have the possibility to influence the time interval for attaching the renewed ribbon to the end of the yarn. The operator then puts the yarn under the draw-off rollers, which ensure the draw-off speed during spinning.

Manual spinning can be successfully used on rotor spinning machines with low spinning speed of the spun yarn, which is in contrast to the efforts of manufacturers and users of rotor spinning machines to increase the productivity of these machines. After the bobbin has come into contact with the drive roller, a certain time interval is required to accelerate it to reach a peripheral speed corresponding to the yarn draw-off speed. This time interval increases with the take-off speed and the weight of the coil. Due to the start of the spool, the instantaneous yarn speed when the yarn end has reached the spinning rotor collecting groove is less than the operational yarn draw-off speed, and therefore a larger number of fibers are deposited with another yarn at the junction of the yarn end the number of twists than the surrounding yarn. The spinner then represents a thickened point of the yarn, which is further detectable by sight and is currently a serious appearance defect not only of the yarn but also of the products made therefrom.

Due to its drawbacks, manual piecing has been gradually replaced by automatic piecing, which has essentially developed in two directions, namely piecing by means of the workstation or piecing by means of the service device, which is able to move along the machine and stop at the selected station.

The automation of the piecing by means of the working place, for example according to CZ 200 910, has proved to be too complicated and costly, since it requires interruption of the yarn withdrawal so that the yarn end remains inside the drain tube, which is impossible at high yarn draw-off speeds.

Automated spinning by means of the control device is today the most widespread method of automated spinning of yarn on rotor spinning machines. For example, according to CZ published PV 2694-95, on a rotor spinning machine, after the yarn breakage, the yarn end is first detected on the raised bobbin by means of a vacuum and sucked into the search nozzle. The yarn length required for spinning is then unwound from the spool and the yarn is transferred to the spinning unit. The yarn is operated by means of a service device by which the yarn is guided into its working path, passing through all the means of the machine operating station except for the yarn distributor. At the end of the measured yarn length, a spinning end of the yarn is formed, which in a first step is partially introduced into the spinning rotor by means of a vacuum. Thereafter, the yarn is actuated by the deflection means of the operating device between the spinning unit and the draw-off device of the machine operating station, and at the end of this action the yarn end is lowered to the collecting groove of the spinning rotor. creates. The yarn is then acted upon by means of the work station for drawing, monitoring and winding the yarn, and then the yarn is transferred from the service device to the distributor of the machine operating station. This achieves repeatedly the same quality and size of the spinners at any work station of the machine. The high quality and small size of the spinning machines is achieved even at high spinning speeds of the rotor spinning machines.

The disadvantage of this piecing method is, however, the higher demands on the technical level of the operator when adjusting the service device, so that despite the achieved yarn quality and high productivity, rotor spinning machines with this piecing method are difficult to apply especially in areas with lower technical level of labor.

SUMMARY OF THE INVENTION

The disadvantages of the state of the art are reduced or eliminated by the method according to the invention, which consists in introducing the yarn into its working path at the rotor spinning machine work station, passing between the draw-off roller and the swiveling roller of the draw-off mechanism. at least one of their working paths

The machine turns the yarn end of the yarn onto the collecting groove of the spinning rotor, to which a fiber ribbon has previously formed, and then the yarn is attached to it. at a given point in time with respect to the lowering of the yarn spinning end on the spinning rotor collecting groove, it starts to draw the work station of the spinning machine and wind it up with the winding device of the work station of the spinning machine.

In this way, an increase in the quality of the spinners is achieved, and thus an overall increase in the quality of the yarn, which the size and quality of the spinners significantly influence. In addition, the efficiency and reliability of the piecing process is increased, despite the considerably lower demands placed on the operator, both in terms of operator qualification and operator time.

Furthermore, it is advantageous if the yarn before its spinning is deflected from its working path in front of the distributor and above the outlet opening of the discharge tube, wherein above the outlet opening of the discharge tube the yarn is deflected a distance from the yarn spinning end from the collecting groove of the spinning rotor. above the outlet opening of the drain tube.

In this way, the piecing reliability is further increased since no further means prevents the yarn from being sucked into the rotor and the distance between the deflection point and the outlet opening of the discharge tube is minimal.

A further refinement of the previous embodiment of the method is achieved by releasing the yarn before the distributor device is released only after the yarn withdrawal has started and the yarn winding has been initiated by the winding device, thereby passing the yarn to the distributor device.

In a more economical variant of the method according to the invention, the yarn is deflected only by the distribution device, releasing its deflection in two steps, the first step returning the spinning end of the yarn to the collecting groove of the spinning rotor before spinning. tract.

Advantageously, the yarn quality and presence between the yarn outlet from the take-off tube and the winding device is sensed and evaluated and based on the yarn quality and presence evaluation, the workstation is stopped in case of poor yarn quality or absence.

The principle of the apparatus for carrying out the above method on an open-end spinning machine is that the arms of the winding device and the pressure lever of the draw-off device are coupled to a control solenoid coupled to the control unit with which the yarn deflection member is coupled. wherein, before and during spinning, the pulling roller of the draw-off device is in the pivoted position away from the pulling roller and the yarn is in its working path between the pulling roller and the pulling roller rolled away therefrom.

Preferably, the deflection member is formed by a piecing deflection member which is disposed above the outlet opening of the drain tube.

In another embodiment, the deflecting member is a diverting deflecting member.

In this respect, it is advantageous from the point of view of the reliability of the piecing process if the guide deflection member is able to occupy two defined positions at the time of its contact with the yarn, a maximum deflection position before piecing and a partially deflected piecing position at the piecing time.

-3GB 284295 B6

The quality of the spun yarn is improved by providing a yarn quality and presence sensor coupled to the control unit between the outlet opening of the take-off tube and the winding device, capable of measuring the quality and size of the spinner and sensing the spun yarn quality during spinning. the control unit is able to stop the yarn production at the workstation 5 in case of spinning yarn of poor quality or in case of poor quality or size of the spinner.

The maximum quality of the spun yarn can be monitored by placing the yarn quality and presence sensor between the outlet opening of the drain tube and the take-off device.

In this case, it is advantageous if the control unit is provided with a switch which is located in a place accessible to the operator at the working station of the open-end spinning machine.

Overview of the figures in the drawing

1 shows the working position of an open-end spinning machine with the individual mechanisms in the spinning working position, FIG. 2 shows the working position of the spinning machine after the yarn break with the individual spinning device, and FIG. 3 shows another variant of the device for individual spinning-in at the machine workstation.

Examples of findings

The rotor spinning machine comprises a plurality of workstations arranged side-by-side, 25 each workstation representing a unit which separately produces the yarn from a sliver of textile fibers and winds the produced yarn onto a bobbin.

Each work station comprises a spinning unit, after 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 7. The feed device 11 is followed by an opener device 12 for splitting the strand 3 into individual fibers. The opener device 12 is associated with a fiber feed transport channel 13 which extends into the interior of the spinning rotor 14, at its widest point being a collecting groove 141 for collecting the fibers into the fiber ribbon 31 due to the centrifugal force of the rotating spinning rotor 14. .

The spinning rotor 14 is formed by any of the known methods. Thus, it is either formed by an open rotary body provided with ventilation openings (not shown) which, when the spinning rotor 14 rotates, creates a vacuum in the interior of the spinning rotor 14, or the spinning rotor 14 is a solid open rotary body without the vacuum chamber at the same time creates a vacuum in the interior of the 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 by a discharge tube 15, from which it is further led to a take-off device 4. The draw-off device 4 is 45 in the illustrated embodiment. 42, common to all workstations on one side of the machine and arranged continuously along the length of the machine.

The draw-off device 4 further comprises a thrust roller 43 which is mounted on the thrust lever 44 50 and abuts the periphery of the respective draw-off roller 41 in the working position and serves to press the yarn 32, the working path of which passes between the draw-off roller 41 and the thrust roller 43.

The second position of the pressure roller 43 is the tilted position in which its circumference is distant from the periphery of the take-off roller 41. The pressure lever 44 is coupled to the control solenoid 5,

Which is realized in the illustrated embodiment by connecting them by means of the first control rod 51, the control solenoid 5 being coupled to the control unit A.

Between the outlet opening of the discharge tube 15 of the spinning unit 1 and the take-off device 4, a yarn quality and presence sensor 6 is guided through which the yarn 32 is guided and in the shown embodiment is coupled to the control unit A.

From the take-off device 4, the yarn 32 is guided through the yarn presence sensor 7 and the known yarn distributor 8 to the winding device 9, which comprises a continuous drive roller 91 along the length of the machine, to which the winding coil 92 is pressed. clamped in the bobbin holder arms 94, which are arranged in a manner known per se 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 a control solenoid 5, in the illustrated embodiment, by a second control rod 52.

A yarn deflection member 30, which is coupled to the yarn deflection solenoid 101 and serves to deflect the yarn 32 beyond its working path, forms the yarn operating distance 32 to form the yarn supply length 32 necessary to the yarn operating path 32 between the yarn presence sensor 7 and the winding device 9. to spin.

The control solenoid 5 and the guide deflection solenoid 101 are provided with power circuits which are connected to the work station control unit A, to which the feed device control device 11, which in the embodiment shown is formed by the electromagnetic coupling 111 of the feed device U, is connected. A is provided with a switch S, which is stored in an operator-accessible location of the machine.

On the body of the spinning unit 1, a known, not shown yarn interruption means 32 is provided at the point where the end of the yarn 32 from the spool 92 at the length of the yarn 32 required for spinning, or a gauge M is arranged, so that the operator knows where to interrupt the yarn.

To improve the piecing quality, the device can be supplemented with a piecing deflection member 20 coupled to a piecing deflection electromagnet 201 having a control circuit connected to the control unit A as shown in FIG. 3. The piecing deflection member 20 is disposed between the outlet opening of the discharge tube 15. and the yarn draw-off device 4 and yarn quality sensor 6 respectively, and serve to deflect the yarn 32, thereby forming a reserve of the yarn 32 for spinning. In this embodiment, the spreader member 10 serves only to delimit the yarn path 32 outside the yarn distributor 8 when the bobbin 92 is raised. In a machine embodiment, it is guaranteed that the yarn path 32 when the bobbin 92 is lifted cannot interfere with the distributor 8 of the yarn 32, the distributor biasing member 10 need not be used.

Upon breakage of the yarn 32 or winding of the desired length of yarn 32 onto the bobbin 92, the sliver feeder 11 stops in a known manner and the wound bobbin 92 clamped between the arms 94 moves away from the drive roller 91 and also stops.

As the arms 94 of the take-up device 9 are tilted, the position of the second control rod 52 of the control solenoid 5 changes. Along with the second control rod 52, the first control rod 51 is also displaced, rotating the thrust lever 44 of the take-off device 4. roller 44.

The guide deflection solenoid 101 moves the yarn deflection member 10 to the deflected position.

If the yarn 32 has broken at the work station, the operator cleans the spinning rotor 14, locates the end of the yarn 32 on the bobbin 92 and starts to unwind the yarn 32. When unwinding the yarn 32 from the picked spool 92 through the distributor deflection member 10, guiding the yarn 32 to the yarn presence sensor 7, inserting it between the pressure roller 43 and the pulling roller 41 from the pulling roller 41 the yarn 32 quality and presence sensors 6, attach it to the meter M or the breaking means and shorten the yarn 32 to the length necessary for spinning. In this way, the operator creates a spinning end on the yarn 32 unwound from the spool 92 and inserts it into the outlet opening of the yarn delivery tube 15. The spinning end of the yarn 32 is sucked into the discharge tube 15 by suction in the spinning rotor 14.

At this stage, the yarn 32 is guided from the spool 92 through the diverting deflection member 10, passes through the yarn presence sensor 7, passes the take-off device 4 between the rotating take-off roller 41 and the pressure roller 43 folded away. extends into the discharge tube 15 to the spinning rotor 14 while not reaching the collecting groove 141 of the spinning rotor 14. The fiber feeding device 11 is stopped, the spinning rotor 14 is rotating and the work station is ready for spinning, the yarn 32 taking its working path the same as in the spinning process, except for the yarn distributor 8, outside of which it is held by the distributor biasing member 10.

The spinning-in process takes place after the switch S of the control unit A is closed by the operator. After the switch S is actuated, the control unit A actuates the clutch 111, after which the feed rollers of the feeding device 11 start to rotate and start to feed the fiber strand 3 to the opener 12 from which the fibers are fed via a transport channel 13 to the spinning rotor 14. As a result, on the collecting groove 141 of the spinning rotor 14, a fiber ribbon 31 begins to form. Prior to forming the fiber ribbon 31, the control unit A actuates the distributor deflection solenoid 101, which releases the distributor deflection member 10 of the yarn 32 and the yarn 32 is released from the distributor deflection member 10 and its spinning end sucks into the spinning rotor 14 a collecting groove 141, on which the fiber ribbon 31 starts to be attached to it in a known manner and yarn 32 is formed. back until the pressure roller 43 abuts the periphery of the rotating take-off roller 44 and grips the yarn 32 and begins to withdraw it from the spinning rotor 14. At the same time, by means of the second control rod 52 the control solenoid 5 starts tilting the arms 94 of the winding device 9 to the spool 92 At the same time as the take-off device 4 starts operation, the control unit A also activates the yarn quality and presence sensor 6 and the yarn presence sensor 7 or starts processing the signals which the sensor 6, 7 issue. This also measures the quality of the connection point of the spinning end of the yarn 32 to the fiber ribbon 31, the so-called spinner, and subsequently checks the quality of the spun yarn 32. Both sensors 6, 7 check the presence of the yarn 32.

Although spinning is performed manually by the operator, this does not affect the quality of the spinner, since the spinning operations themselves are carried out by means of the spinning machine workstation. The machine can therefore be operated by untrained operators with minimal skill.

If the yarn 32 is completely released from the distributor 10 before spinning, there is a risk that the yarn 32 will be caught by the yarn distributor 8 before spinning. Therefore, according to another embodiment, the spreader deflecting member 10 has a spun position ZP defined, wherein the difference in the length of the yarn 32 passing over the spreader deflecting member 10 in the deflected position VP and spun position ZP is equal to the spacing of the spun yarn 32 in the spout 15 from the collecting groove. Thus, before spinning, the distributor deflection member 10 is displaced from the deflected position VP into the spinning rotor 14 as shown in FIG.

Thus, the spinning end of the yarn 32 is moved to the collecting groove 141 of the spinning rotor 14 and the fiber ribbon 31 begins to attach thereto. Only when the yarn draw-off, winding and tracing 32 is initiated by the control unit A does the control unit A again actuate the distributor deflection solenoid 101, which moves the distributor deflection member 10 to a relaxed position away from the yarn operating path 32. After the yarn deflection member 10 has been released, the yarn 32 is caught by the yarn distributor 8, which forms a cross winding during the winding of the yarn 32 onto the spool 92.

The piecing of the embodiment according to FIG. 3 proceeds similarly, only the reserve of the yarn 32 for self-spinning is lowered into the spinning rotor 14 by the piecing deflection member 20 by which the piecing deflection electromagnet 201 moves according to the instructions of the control unit A.

The piecing deflection solenoid 201 and the directional deflection solenoid 101 can be replaced by other suitable known devices, such as a pneumatic cylinder, a stepper motor or the like.

PATENT CLAIMS

Claims (11)

A method for individually spinning yarn at a rotor spinning machine, in which a yarn end is first manually scanned on a raised spool, the yarn length required for spinning is manually measured, and a yarn spinning end is formed at the end of the yarn. rotor, characterized in that, prior to spinning, the yarn (32) is introduced into its working path at a working station of the rotor spinning machine, passing between the take-off rollers in a tilted position, and deflected from its working path by at least one deflecting means (10, 20) working place of the spinning machine, passing outside the distributor (8), after which the spinning end of the yarn (32) is lowered to the collecting groove (141) of the spinning rotor (14) on which the ribbon has been formed (31) fibers, which are attached to it then the yarn (32) begins to be withdrawn at the specified time with respect to the lowering of the spinning end of the yarn (32) to the collecting groove (141) of the spinning rotor (14). ) of the spinning machine. Method according to claim 1, characterized in that, before spinning, the yarn (32) deviates from its working path in front of the distributor (8) and above the outlet opening of the discharge tube (15), wherein above the outlet opening of the discharge tube (15) is the yarn (32) is deflected by the distance of the yarn end of the yarn (32) from the collecting groove (141) of the spinning rotor (14) and the yarn (32) deflection above the outlet opening of the discharge tube (15) is released. Method according to claim 2, characterized in that the yarn (32) is deflected in front of the distributor (8) only after the yarn withdrawal (32) has started to be withdrawn by the withdrawal device (4) and the yarn winding (32) has started. , whereby the yarn (32) is transferred to the distribution device (8). Method according to claim 1, characterized in that the yarn (32) is deflected only by the distribution device (8), the release of said deflection being carried out in two steps, the first step returning the spinning end of the yarn (32) to the collecting device a groove (141) of the spinning rotor (14) and the second after the yarn draw-off and winding start (32) release the yarn (32) into the distribution device (8). Method according to Claims 1 to 4, characterized in that the quality and presence of the yarn (32) is detected and evaluated between the yarn outlet (32) from the discharge tube (15) and the winding device (9) and based on the yarn quality and presence evaluation. 32) the workstation stops in case of poor quality or absence of yarn (32). Apparatus for carrying out the method according to claims 1 to 5 on an open-end spinning machine, each work station comprising a spinning unit with a sliver feeding device, a spinning rotor and a yarn removal tube, over which a draw-off device comprising a take-up roller and a presser roller mounted on the pivotable pressure lever, 10 shows a yarn presence sensor, a yarn distributor and a yarn winding device, in the arms of which a bobbin is mounted, further comprising a control unit which is connected to a fiber sliver feed device and to a yarn quality and / or presence sensor, (94) the winding device (9) and the thrust lever (44) of the draw-off device (4) are coupled to a control solenoid (5) coupled to the control unit (A) with which the yarn deflecting member 15 wherein, prior to and during spinning, the press roller (43) of the draw-off device (4) is in the pivoted position away from the draw-off roller (41) and the yarn is in its working path between the draw-off roller (41) and the pressure roller (43). 20 May Apparatus according to claim 6, characterized in that the deflection member is formed by a piecing deflection member (20) which is mounted above the outlet opening of the discharge tube (15). Device according to claim 6, characterized in that the deflecting member is formed 25 with a deflection member (10). Apparatus according to claim 8, characterized in that the deflecting member (10) is able to occupy two defined positions, the maximum deflected position (VP) before spinning and the partially deflected piecing position (ZP) at the time of its contact with the yarn (32). during 30 spinning. Device according to Claims 6 to 9, characterized in that a yarn quality and presence sensor (32) coupled to the control unit (A) is arranged between the outlet opening of the discharge tube (15) and the winding device (9). Device according to claim 10, characterized in that the yarn quality and presence sensor (6) is arranged between the outlet opening of the discharge tube (15) and the exhaust device (4). Device according to Claims 6 to 11, characterized in that the control unit (A) is provided with a switch (S) which is located at a position accessible to the operator at the work station of the open-end spinning machine.