CZ282705B6 - Process of drawing-off auxiliary yarn from an auxiliary bobbin disposed on a handling device of a rotor spinning machine and apparatus for making the same - Google Patents

Abstract

The auxiliary yarn (2) is withdrawn from the auxiliary coil (3) mounted on the service device of the rotor spinning machine by operating means of the service device in service of the working position of the rotor spinning machine when inserting the empty tube (12) and / or piecing into the empty tube (12). When the auxiliary yarn (2) is pulled from the auxiliary bobbin (3) by the operating means of the service device, the braking force is applied to the auxiliary yarn (2) and an auxiliary feed force is applied to the auxiliary yarn (2) behind the braking distance, thereby achieving a continuous withdrawal auxiliary yarn (2) while maintaining sufficient and constant tension in the auxiliary yarn (2) The service device comprises an insertion arm (7) with a feed clamp and inserted into the auxiliary yarn path (2) between the auxiliary coil (3) and the insertion arm (7) the auxiliary yarn feed device (2)

Description

(57)

The auxiliary yarn (2) is withdrawn from the auxiliary bobbin (3) mounted on the rotor spinning machine operating device by the operating means of the operating device while operating the rotor spinning machine working place when inserting the empty tube (12) and / or spinning on the empty tube (12). When the auxiliary yarn (2) is withdrawn from the auxiliary spool (3) by the operating means of the operating device, the auxiliary yarn (2) is applied by the braking force and after the braking force is applied to the auxiliary yarn (2) by the auxiliary feed force. the auxiliary yarn (2) while maintaining sufficient and constant tension in the auxiliary yarn (2). The control device comprises an insertion arm (7) with a feed clamp and between the auxiliary bobbin (3) and the insertion arm (7) is inserted into the path of the auxiliary yarn (2) of the auxiliary yarn feeder (2).

Method for withdrawing an auxiliary yarn from an auxiliary spool mounted on a rotor spinning machine control device and a method for carrying out the method

Technical field

The present invention relates to a method for withdrawing an auxiliary yarn from an auxiliary spool mounted on a rotor spinning machine operating device by the operating means of the operating device while operating the rotor spinning machine working place when inserting an empty tube and / or spinning onto an empty tube.

The invention further relates to an operating device for carrying out the method comprising an auxiliary bobbin from which the auxiliary yarn is guided to a loading arm provided with a feed clamp.

BACKGROUND OF THE INVENTION

During its development, open-end machines underwent a stormy development. They are largely automated and operating devices are generally known which can guarantee the operation of the machine virtually without human intervention. So far, there are basically three basic coil replacement and re-spinning processes, with specific solutions for each company showing minor differences in each process.

The first group includes procedures that allow the bobbins to be changed without interrupting the spinning and thus do not require a new spinning. The insertion of the new sleeve takes place while the workstation is running, the yarn is usually removed by suction into the collector during the replacement period and, after replacement, separated and re-guided to the spool. This procedure has three disadvantages. Firstly, it is the loss of the yarn that has been removed. Secondly, it is not suitable for high take-off speeds, since the self-replacing mechanism has to operate at high speeds and with considerable dynamic forces and thus does not have a long service life and thirdly it cannot be applied at a stationary work station. .

This drawback, the difficulty in initiating a new spinning cycle, has been eliminated by a second group of processes, which consists in interrupting the spinning for the necessary time each time the spinning unit is cleaned and re-spun, the yarn for re-spinning being recovered from the wound yarn, or the machine carries with it already wound yarn, which may be, for example, of a different character than the machine produced, but more suitable for spinning. The actual change of the spool, mainly the insertion of the empty tube into the machine arms is then carried out during spinning, as in the previous case, with the disadvantages of this process.

Therefore, another method has been devised and practiced, which consists in replacing the full-spool bobbin with an empty tube when the spinning station is stopped spinning. In order to allow subsequent spinning and automatic spinning to proceed, this sleeve is provided with a special basic wrapping mechanism before it is clamped into the winding arms, the length of which is sufficient for at least one spinning. This procedure allows easy realization of the machine even at very high draw-off speeds, since the coils are changed at a stationary workstation and thus independent of the draw-off speed. This workflow is thus seemingly perfect.

Practical tests have shown that on a tube with only a few initial windings, when searching for the end of the yarn by the suction nozzle of the automatic machine, especially on a perforated tube, to a lesser extent on a conical tube, thus, the piecing failure, the reliability of the coil change is reduced. Furthermore, the theory of spinning implies that it is impossible to make yarn simply by spinning,

Where the point of spinning would not be visible. It always represents a noticeable defect in the appearance of the yarn. Also, the yarn from which the auxiliary starter winding on the tube is made is not identical to the yarn produced at the spinning station. At first glance, these reservations may seem petty, but the fact is that in goods, especially in knitwear, slight deviations accumulate and represent a noticeable defect. At increasing speeds of the open-end machines, it would be desirable to be able to change the bobbin while the work station is stationary so as not to impose enormous demands on the operating mechanisms while ensuring that the spinning device and the starting yarn do not enter the goods during subsequent operations.

These disadvantages are overcome by the re-spinning method on open-end spinning machines according to published CZ Pat. No. 2899-91, in which, when clamping an empty tube between the hinged arms of the bobbin holder at a non-forward spinning point, an auxiliary yarn is introduced between the hinged arm and the rim of the hollow tube, which is then clamped by the hinged arm; The yarn is spun and then the auxiliary yarn is wound together with the beginning of the newly spun yarn as a yarn deposit on the core, after which the yarn is transferred to the distributor device of the cross bobbin forming machine.

The operating device according to CS patent No. 281 023 comprises a rotatably mounted insertion arm of the tube, at the end of which the tube gripping device is formed and at the same time the auxiliary yarn catching device is disposed, the suction opening being opposite the auxiliary yarn holding device. in the transfer position next to the face of the sleeve, the spinning head being rotatably mounted in the housing of the service device and at its end a device for forming the end of the auxiliary yarn and adjusting it for spinning.

In this solution, the auxiliary yarn is mounted on a supply spool from which it is guided through a guide eye to a device for holding the beginning of the auxiliary yarn, for example a yarn brake, from which the auxiliary yarn exits in the region opposite the suction opening of the yarn. As the auxiliary yarn catching device moves further, the auxiliary yarn is pulled out of said yarn brake, which is released, directly from the auxiliary supply spool. As a result, the yarn undergoes rapid voltage variations which have a negative effect in particular on the reliability of the piecing process.

SUMMARY OF THE INVENTION

The aforementioned drawbacks of the prior art are eliminated by the method of withdrawing the auxiliary yarn from the auxiliary bobbin stored on the rotor spinning machine operating device according to the invention, which is characterized in that when the auxiliary yarn is withdrawn from the auxiliary bobbin by applying an auxiliary feed force to the auxiliary yarn and the auxiliary yarn auxiliary coil, the auxiliary yarn is applied to the auxiliary yarn by means of a braking force, thereby achieving a continuous withdrawal of the auxiliary yarn while maintaining sufficient and constant tension in the auxiliary yarn.

In this case, it is advantageous if the auxiliary feeding force acts only during the withdrawal of the auxiliary yarn, while the braking force acts on both the moving and standing auxiliary yarn, while sensing the movement of the auxiliary yarn, thereby optimizing the conditions for withdrawing the auxiliary yarn from the auxiliary spool. controlling the progress of the withdrawal of the auxiliary yarn from the auxiliary spool.

The principle of the operating device for carrying out the method according to the invention is that an auxiliary yarn feeder is inserted between the auxiliary spool and the insertion arm, and a yarn brake is inserted between the auxiliary yarn feeder and the auxiliary spool in the auxiliary yarn path.

-2GB 282705 B6

In this case, it is advantageous if an auxiliary yarn travel sensor is inserted in the auxiliary yarn path in front of the auxiliary yarn feeder.

The auxiliary yarn feeder of all the above-mentioned variants of the service device can advantageously consist of an ejector.

Overview of the drawings

An exemplary embodiment of an apparatus for carrying out the method of withdrawing an auxiliary yarn according to the invention is schematically shown in the attached drawing, wherein Fig. 1 shows the device in the phase of taking the auxiliary yarn through the suction tube of the insertion arm of the tube. 3 shows the device in the phase of terminating the withdrawal of the auxiliary yarn and its interruption between the spinning clamp and the feeding clamp.

DETAILED DESCRIPTION OF THE INVENTION

The rotor spinning machines comprise a plurality of workstations arranged in one or two rows side by side. To operate the workstations, a service device is provided, which is adjustable along the workstations of the machine, which comprises a plurality of mechanisms intended to operate the individual workstations when restoring the work functions.

Each work station comprises a known spinning unit (not shown) in which a yarn is produced in a known manner from a sliver of fibers which is fed into it from a sliver, which is also not shown. The yarn produced in the spinning unit is fed to a winding device 1, where it is wound onto a spool placed between spool arms 11. After winding a specified length of yarn onto a spool or after reaching other final parameters of the spool, the spool is slipped and replaced by empty means. In order to resume the spinning process, the service device means is inserted between one face 121 of the tube 12 of the auxiliary yarn 2, fastened there, and then the auxiliary yarn 2 is moved to the spinning unit by the means of the service device. that portion of the auxiliary yarn 2 which is clamped between the tube 12 and the spool arm 11 of the winding device 1 represents the piecing end of the auxiliary yarn 2.

An auxiliary spool 3 is mounted on the service device, on which the auxiliary yarn 2 is wound. The auxiliary yarn 2 is guided from the auxiliary spool 3 via a guide 4 of the auxiliary yarn 2 arranged on the service device. Downstream of the auxiliary yarn guide 4, the auxiliary yarn 2 is guided through the presence sensor 5 of the auxiliary yarn 2 and the yarn brake 6, which is formed in one of the known ways and like the presence sensor 5 of the auxiliary yarn 2. A part of the service device is also an insertion arm 7 of the auxiliary yarn 2, which is hollow and terminated by the feed clamp 71 of the auxiliary yarn 2. An auxiliary supply device 72, which in the specific embodiment is formed by an ejector.

A known suction tube 81 of a known insertion arm 8 of the service device is displaceably arranged to the mouth 711 of the feed yarn 71 of the auxiliary yarn 2. A transfer clamp 82 of auxiliary yarn 2 is arranged downstream of the inlet opening of said suction tube 81.

The service device is further provided with known means for measuring the length of the auxiliary yarn needed for spinning and means for transferring the auxiliary yarn 2 to a spinning unit (not shown) and to form the piecing end of the auxiliary yarn 2. These means are shown in the drawings.

These are only schematic, as they represent one of many possible solutions. In the illustrated embodiment, said means comprise a yarn length metering device 91 required for spinning with a yarn catch hook 911, a yarn guide 92 of the spinning head 93 that includes a yarn spinning clamp 931, a yarn tensioner 932 and a breaker 933 formed in the illustrated example. with cutter cutter. These means are the same as the means for recovering the spinning at the work station after the yarn break, in which the spinning-renewing yarn is unwound from a partially wound spool housed in the winding device.

After replacing the wound bobbin with the empty tube 12, an auxiliary yarn 2 unwound from the auxiliary bobbin 3 stored on the control device is used to restore the spinning at the service station. When inserting the empty tube 12 between the spool arms 11 of the winding device 1, the insertion arm 8, which comprises the suction tube 81 of the auxiliary yarn 2, is aligned with the inlet opening of the suction tube 81 against the mouth 71 1 of the feed clamp 71 of the auxiliary yarn 2. the vacuum clamp 71, and preferably the end of the auxiliary yarn 2 protruding from the feed clamp 71 of the auxiliary yarn 2 is sucked into the suction tube 81. The feed clamp 71 releases the auxiliary yarn 2 so that it can pass freely through it and into the ejector of the auxiliary feeding device 72, the transport air is drawn, which draws the auxiliary yarn 2 from the auxiliary spool 3 and the auxiliary yarn 2 more easily passes through the insertion arm cavity 7 and is sucked into the suction tube 81 of the insertion arm 8.

When the end of the auxiliary yarn 2 enters the suction tube 81 beyond the transfer clamp 82 of the auxiliary yarn 2, the auxiliary yarn 2 is clamped by this transfer clamp 82. Upon subsequent movement of the insertion arm 8 with the sleeve 12 towards the winding device 1, the auxiliary yarn 2 is held in the transfer clamp 82 and withdrawn from the insertion arm 7 through the orifice 711 of the feed clamp 71. During this withdrawal of the auxiliary yarn 2 into the insertion arm 2 by the ejector of the auxiliary feeding device 72.

When stopping the movement of the insert 12 between the open spool arms 11 of the winding device 1, the yarn is tensioned between the inlet opening of the suction tube) and the mouth 711 of the feed clamp 71, passing between one end 121 of the tube 12 and the respective spool arm 11 of the winding device 1. In the sleeve 12 between the spool arms 11, the auxiliary yarn 2 is clamped between the face 121 of the sleeve 12 and the respective spool arm 11 of the winding device 1 and from this clamping point the auxiliary yarn 2 is tensioned to the mouth 711 of the feed clamp 71.

After clamping the auxiliary yarn 2 in the winding device 1, the auxiliary yarn 2 between the winding device 1 and the mouth 711 of the feed clamp 71 is caught by the hook 911 of the metering device 91 for the yarn length necessary for spinning. By moving said hook 911, the auxiliary yarn 2 is guided to the circumference of the tensioning roller 932 of the spinning head 93, which is then tilted to its piecing position and brings the auxiliary yarn 2 near the spinning unit (not shown). During this process of measuring the length of the yarn and transferring the yarn to the vicinity of the spinning unit, the auxiliary yarn 2 is further withdrawn by the corresponding means of the service device from the mouth 711 of the feed clamp 71 and at least during this withdrawal of the auxiliary yarn 2 the auxiliary yarn 2 from the auxiliary spool 3 to the insertion arm 7.

After the required yarn length has been measured, the auxiliary yarn 2 is tensioned between the winding device 1 and the mouth 711 of the feed clamp 71, passing through the hook 911 of the metering device 91 and around the circumference of the tensioning roller 932 of the spinning head 93. At this point, the auxiliary yarn 2 is clamped by the feed clamp 71 and the spinning clamp 931 and the interruption device 933 is interrupted. Thereby a piecing end of the auxiliary yarn 2 is formed on the part of the auxiliary yarn 2 passing through the piecing clamp 931 and on the remaining part of the auxiliary yarn 2

Starting from the auxiliary bobbin 3, an end extending from the feed clamp 711 is formed to be received by the suction tube 81 of the insertion arm 8 of the tube 12 during the next cycle of replacing the full bobbin with an empty tube 12 or inserting the empty tube 12 into the winding device L

During the withdrawal of the auxiliary yarn 2 from the auxiliary bobbin 3, the auxiliary yarn 2 is guided through the conductor 4 into the presence sensor 5 of the auxiliary yarn 2, which reacts to the movement of the auxiliary yarn 2. the yarn 2 does not move at the time when it is to be withdrawn from the auxiliary spool 3 by said means 5 in said sensor 5, the sensor 5 gives the absence of the auxiliary yarn 2 to the cooperating means and at the same time gives a signal to the operator to remedy the fault. Until the fault is eliminated, the service device does not deposit the empty tubes 12 in the winding device 1 and, in most cases, also a package of wound bobbins.

Downstream of the sensor 5 of the auxiliary yarn 2, the auxiliary yarn 2 passes through the yarn brake 6, which has an adjustable braking force and serves to create an optimum tension in the auxiliary yarn 2 as it is pulled from the auxiliary bobbin 3 and fed into the insertion arm 7.

In alternative embodiments, the ejector of the auxiliary feed device 72 may be replaced by another known device for withdrawing the auxiliary yarn 2 from the auxiliary spool 3 and for feeding the auxiliary yarn 2 to the insertion arm 7.

PATENT CLAIMS

Claims (5)

A method for withdrawing an auxiliary yarn from an auxiliary spool mounted on a rotor spinning machine operating means by the operating means of the attending machine while operating the rotor spinning machine station when inserting an empty tube or spinning on an empty tube. characterized in that when the auxiliary yarn (2) is withdrawn from the auxiliary spool (3), the auxiliary yarn (2) is subjected to an auxiliary feed force, the braking force being applied to the yarn between the auxiliary spool (3) of the auxiliary yarn (2) and the point of application of the auxiliary feed force, thereby achieving a continuous withdrawal of the auxiliary yarn (2) while maintaining sufficient and constant tension in the auxiliary yarn (2). Method according to claim 1, characterized in that the auxiliary feeding force acts only during the withdrawal of the auxiliary yarn (2), while the braking force acts on both the moving and standing auxiliary yarn (2), the movement of the auxiliary yarn (2) being sensed, thereby achieving optimum ratios when withdrawing the auxiliary yarn (2) from the auxiliary bobbin (3) and at the same time controlling the course of the drawing process of the auxiliary yarn (2) from the auxiliary bobbin (3). Apparatus for carrying out the method according to claim 1 or 2, comprising an auxiliary spool, with an auxiliary yarn wound and an insertion arm provided with an auxiliary yarn feeder, characterized in that an auxiliary dispenser is inserted between the auxiliary spool (3) and the insertion arm (7). the auxiliary yarn device (72), wherein a yarn brake (6) is inserted between the auxiliary yarn feeder (72) and the auxiliary bobbin (3) in the auxiliary yarn path (2). Device according to claim 3, characterized in that a sensor (5) of the movement of the auxiliary yarn (2) is inserted in the path of the auxiliary yarn (2) before the auxiliary yarn feeding device (2). -5GB 282705 B6 Device according to claims 3 and 4, characterized in that the auxiliary yarn feeder (72) of the auxiliary yarn (2) is formed by an ejector.