JPS6214649B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for removing fiber ribbons, sometimes together with cut yarn ends, from the spinning rotor of an open-end spinning machine in which the yarn is taken up and wound onto a bobbin by traversing rollers. The present invention relates to an apparatus for carrying out the pneumatic method.

Apart from the many positive advantages of open-end spinning machines, which are recognized, for example, in improved yarn quality and considerable savings in manpower, it also prevents the spinning process from being relayed due to yarn breaks, spinning machine stoppages, etc. There are certain problems that need to be solved that can be seen in the case of

In the event of such interruptions in operation, it is necessary to remove the fiber ribbon from the spinning rotor, sometimes together with the yarn ends that were sucked into the rotor when the yarn broke.

Up until now, methods have been used that have been deemed capable of performing this function by periodically or continuously cleaning the rotor.
These methods do not give reliable results. This is the reason why the above-mentioned method is unsuitable for implementation in modern high-efficiency automated open-end spinning machines.

The object of the present invention is to overcome the above-mentioned drawbacks of the prior art and thus to provide a highly efficient automated open-end spinning machine capable of reliable spinning operations.

The method of the present invention is configured as follows. i.e. if the spinning process is interrupted, the fiber ribbon,
The fiber ribbon, sometimes together with the cut yarn ends, is drawn off by a pressurized air stream flowing towards the front plane of the spinning rotor and towards the opening of the ribbon take-off duct, thus removing any possible residual fibers. The spinning rotor is cleaned for checking purposes by directing a flow of pressurized air into the focusing channel of the spinning rotor.

The apparatus employed to carry out the above-described method according to the invention comprises a cover of a housing having a fiber supply duct, the cover having a fiber ribbon removal nozzle, the opening of which allows the rotor and the cover to be connected to each other. In the remote position, it is oriented in the plane of the front opening of the rotor towards the ribbon take-off duct.

Furthermore, this housing has, in the spinning position, an auxiliary nozzle which is oriented towards the focusing channel of the spinning rotor, so that when viewed from the axial direction of the spinning rotor, it is located in a plane perpendicular to the rotor axis and transverse to the focusing channel. The geometrical projection of the auxiliary nozzle axis onto makes an angle of 60° to 75° with respect to the tangential line passing through the intersection of this axis with the focusing channel.

Furthermore, it would also be considered advantageous if the pressurized air streams discharged from the ribbon removal nozzle and the auxiliary nozzle alternated with each other at short time intervals.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure and effects of the method and apparatus according to the present invention will be explained in detail below with reference to embodiments shown in the accompanying drawings.

The spinning rotor 1 held by bearings 11 and 12 is driven in contact by a drive means (not shown),
The cavity with the fiber convergence surface 13 communicates with a thread take-off duct 14 for taking off the thread 2, whose presence is scanned by a filler 31 forming part of the control unit 3. The thread 2 passes through the cutting mechanism 4 and is wound by the traverse roller 5 onto a bobbin 21 which is in frictional contact with the traverse roller 5.

During operation, the front opening of the spinning rotor 1 is closed by the cover 6.
This cover 6 is provided with an annular recess 61 coaxially with the spinning rotor 1 . The leading edge of the spinning rotor 1 is received in this recess 61, while the cover 6 has a projection 62, which in this example has a cylindrical shape coaxial with the recess 61 and partially It is stuck inside the rotor cavity. A fiber supply duct 63 is provided in the body of the cover 6, which may form part of the housing of a known fiber unwinding device (not shown), which is directed towards the sliding wall 15 of the spinning rotor 1. In this embodiment, the fiber supply duct 63 opens into a circumferential groove provided in the cylindrical projection 62 . However, it is also possible to employ other structures such as various buffling means.

Furthermore, the cover 6 includes a fiber ribbon removing nozzle 7.
and an auxiliary nozzle 71 are provided. The former opens into the outer wall of the annular recess 61, while the latter opens into the protrusion 6.
It opens within the wall of the circumferential groove 2 and extends obliquely upward toward the fiber converging surface 13 at the spinning position. Therefore, as shown in Fig. 4, when viewed from the axial direction,
The axis of the auxiliary nozzle 71 forms an angle A in the range of 60° to 70° with a tangent at the intersection of this axis and the circumferential surface of the focusing surface 13. As shown in FIGS. 2 and 3, the relative separation of the spinning rotor 1 and the cover 6 to assume the non-spinning position is effected by a machine (not shown) actuated by a signal provided by a control unit 3. This can be done by mechanical or mechanical-pneumatic means. This control unit 3 further controls the drive of the traverse roller 5, the spinning rotor 1, the cutting mechanism 4, and the duct 6.
3, the ribbon removal nozzle 7 and the auxiliary nozzle 71 are controlled. The functionality of this control unit is monitored by the program.

During operation, the separated and unwound fibers are carried to the sliding wall 15 of the spinning rotor 1 rotating at high speed, and are collected on the focusing surface 13 by the action of centrifugal force, and the collected fibers are A ribbon is formed, removed and twisted into yarn. This yarn is taken off from the spinning rotor 1 in a known manner, the presence of which is scanned by a filler 31, and then wound onto a bobbin 21 via a cutting mechanism.

Next, a method for removing the fiber ribbon will be explained.

When the thread is cut, the filler 31 sends a signal to stop the bobbin 21 before the thread passes through the cutting mechanism 4. At the same time, the fiber supply to the spinning rotor 1 is stopped. As shown in FIG. 5, the end of the thread 2 is cut by a cutting mechanism 4. Then, the bobbin 21 is reversed a little, and the thread coming out of the bobbin 21 enters the lower part of the tube 41. Here, the inside of the tube 41 is maintained at subatmospheric pressure. The spinning rotor 1 is in a stopped state, and the rotor and the cover 6 are in a relatively separated state as shown in FIGS. 2 and 3. In this position, the nozzle 7 is activated so that a stream of pressurized air directed into the ribbon removal duct exits continuously or intermittently. The air flow is (substantially) in the plane of the leading edge of the spinning rotor 1
Due to the blowing, a suction effect occurs and the fiber ribbon is removed from the spinning rotor 1 together with the suctioned cut yarn ends.

After the spinning rotor 1 and cover 6 are fitted together again,
The front opening of the rotor is closed with a protrusion 62, so that any fiber ribbons remaining in the spinning rotor 1 can be removed by intermittent pressurized air flow from the auxiliary nozzle 71 and removed from the rotor. 1 is held with a gap between the cover 6 and the cover 6.

In these two cases, the fiber ribbon is removed and the yarn ends are conveyed to a differential user outside the rotor (not shown) and finally to a central air handling duct located outside the machine. During operation of the auxiliary nozzle 71, the spinning rotor 1 can be rotated slowly by discharging air.

After the aforementioned operating operations, the spinning rotor 1 is restarted and the cutting mechanism is moved to its standby position (initial position), while the cut end of the yarn is received in the lower part of the tube 41 and the bobbin 21 is reversed. The end of the yarn 2 is thus introduced into the spinning rotor 1. This yarn end is sucked into the rotor 1 by subatmospheric pressure within the rotor, and at the same time, this rotor 1 receives the separated and unwound fibers to join the introduced yarn ends to form a fiber ribbon. do. Here, the bobbin 21 begins to rotate in the normal (winding) direction, and at the same time, the yarn is started to be taken up from the spinning rotor 1, and the filler 31
is made to work. In this way, the spinning operation is restarted.

Another ribbon removal process according to the invention includes:
For example, the yarn ends are held in the reserve tube by pneumatic action. The yarn ends are treated by airflow from other auxiliary nozzles or by the suction effect created in the reserve tube during the ribbon removal process. Before resuming spinning operation,
That is, before the spinning rotor is rotated at full speed, the end of the yarn is spun to resume spinning either by another air stream from another auxiliary nozzle or by a suction effect, or by a combination of both. guided into the rotor.
It is also possible to suitably treat the yarn ends using means not according to the invention for a period of time during which the yarn ends assume the opposite position.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional schematic front view of an open-end spinning unit according to the invention showing the relative positions of the bobbin, traverse roller, cutting mechanism, spinning rotor, duct and nozzle cover; FIG. A partially sectional schematic front view showing the open-end spinning unit shown in FIG. 1 with the spinning rotor and cover separated, and FIG. 3 is a ribbon of the spinning unit showing the same state as FIG. 2. 4 is a plan view showing the opening of the auxiliary nozzle in the cover in FIG. 3, and FIG. FIG. 3 is a longitudinal sectional view of the cutting mechanism of the end spinning unit. In these figures, 1 is the spinning rotor, 2 is the yarn,
3 is a control unit, 4 is a cutting mechanism, 5 is a traverse roller, 6 is a cover, 7 is a fiber ribbon removal nozzle, 11 and 12 are bearings, 13 is a fiber convergence surface of the rotor, 14 is a yarn take-off duct, and 15 is a spinning The sliding wall of the output rotor, 21 is a bobbin, 31 is a filler, 41 is a tube, 61 is an annular recess in the cover,
62 is a protrusion, 63 is a duct, and 71 is an auxiliary nozzle.

Claims (1)

Claims: 1. A method for pneumatically removing fiber ribbons, sometimes together with cut yarn ends, from a spinning rotor of an open-end spinning machine in the event of an interruption of the spinning process, comprising: directing a pressurized air flow along the plane of the front opening of the spinning rotor into a fiber removal duct to remove the fiber ribbon, particularly along with the cut yarn ends, and then remove all fibers and impurities. into the fiber focusing channel of the spinning rotor to remove the
A method for pneumatically removing fiber ribbons and cut yarn from a spinning rotor, the method comprising: cleaning the spinning rotor by directing a flow of pressurized air therein. 2. A spinning rotor having a convergence surface that receives the defibrated staple fibers carried by the air flow, a fiber supply duct that supplies the staple fibers to the spinning rotor by the air flow, and the fiber convergence surface. In an open-end spinning device comprising a yarn take-out tube for taking off the spun yarn which is taken off in the form of a ribbon and twisted by the rotation of the spinning rotor, the spinning device further includes a housing having a fiber supply duct. a cover is provided, and the cover is provided with a fiber ribbon removal duct, the cover having a fiber ribbon removal jet nozzle, the opening of which opens when the spinning rotor and the cover are pulled apart relative to each other; An open-end spinning machine characterized in that it is located substantially in the plane of the front opening and is oriented towards the fiber ribbon removal duct, which removes the fiber ribbon and cut yarn from the spinning rotor by air when spinning is interrupted. A device that removes 3. The housing has, in the spinning position, an auxiliary nozzle oriented toward the fiber focusing channel of the spinning rotor, and the housing has an auxiliary nozzle oriented toward the fiber focusing channel of the spinning rotor, and when viewed from the axial direction of the spinning rotor, the housing has an auxiliary nozzle oriented toward the fiber focusing channel on a plane perpendicular to the rotor axis and transverse to the focusing channel. 3. Device according to claim 2, characterized in that the geometrical projection of the auxiliary nozzle axis makes an angle of 60° to 75° with respect to the tangential line passing through the intersection of this axis with the focusing channel. 4. In order to efficiently perform the fiber ribbon removal process, the pressurized air flow from the fiber ribbon removal nozzle and the auxiliary nozzle is generated intermittently and sequentially at short time intervals. Device.