CZ298574B6 - Method of bottom distribution of yarn in workstation of a rotor spinning machine and apparatus for making the same - Google Patents

Abstract

In the present invention, there is disclosed a method of bottom distribution of yarn (4) in a workstation of a rotor spinning machine having at least one row of workstations wherein the method is characterized in that yarn (4) leaving a spinning unit (1) is subjected to the action of a bottom distribution means performing a linear reciprocating motion in the direction of the machine length to thereby repeatedly deflecting the yarn (4) from its straight path within the range of at least a portion of width of the yarn (4) draw-off device drawing off rollers (5). Due to the action of the bottom distribution means, the yarn (4) is repeatedly deflected from its straight path on one side only, whereby after each deflection to that one side, the yarn (4) returns to its straight path. During this return, the yarn (4) is in contact with one wall of the bottom distribution means to thereby enabling creation of a simpler and thus cheaper apparatus for bottom distribution of yarn on rotor spinning machines. There is also disclosed an apparatus (6) for bottom distribution of yarn (4) on a rotor spinning machine comprising a distribution bar (60) arranged in reverse adjustably manner in the direction of its length along a row of workstations of the rotor spinning machine between spinning units (1) and yarn (4) draw-off devices (5) of said row of workstations. The distribution bar (60) is coupled with a drive and in the region of each workstation, it is provided above the yarn (4) outlet of each spinning unit (1) with a yarn (4) bottom distribution means that is formed by a single projection (61) situated in front of the distribution bar (60) and at least one side of the projection (61) is adapted for contact with the yarn (4).

Description

Method of the bottom distribution of yarn at a working place of a rotor spinning machine and a device for its implementation

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a method of lowering the yarn at a rotor spinning machine having at least one row of workstations, wherein the yarn exiting the spinning unit is subjected to a lower distributor with a linear reciprocating movement. paths over at least a portion of the width of the yarn draw-off rollers.

The invention also relates to an apparatus for lower yarn distribution on a rotor spinning machine, which comprises a guide bar reversibly adjustable along its length arranged along a series of workplaces of the rotor spinning machine between the spinning units and the yarn draw-offs. the bar is coupled to the drive and, in the region of each work station, is provided with a lower yarn guide means above the yarn exit from the spinning unit.

BACKGROUND OF THE INVENTION

On rotor spinning machines which contain a plurality of workstations arranged side by side on at least one side of the machine, the yarn withdrawn at each workstation by the draw rollers is distributed at two points. The first point, i.e. the bottom yarn distribution point, is the point between the yarn exit from the spinning unit and the yarn entry between the take-off rollers for withdrawing the yarn from the spinning rotor. At this first point, the yarn is distributed to both sides relative to the yarn exit from the spinning unit, since if the yarn stood in place, there would be an intense abrasion of the surface of the take-off rollers and they would lose their ability to withdraw the yarn. The second yarn distribution point on the rotor spinning machines is the yarn distribution when the yarn is wound onto a bobbin, especially when forming a cross winding.

There is known a device for lower yarn distribution on a rotor spinning machine comprising a guide rod arranged along workstations on one side of the machine, the guide rod being reversibly adjustable in the longitudinal direction. At each work station, the guide rod is provided with a vertical guide groove of the distributed yarn, which guide groove can either be formed as a groove directly in the guide rod, or it can be formed in a guide element mounted on the guide rod, e.g. double arm forks. By this device, the yarn is deflected on both sides with respect to the yarn exit from the spinning unit.

A disadvantage of this device is the relative complexity of the yarn distribution to both sides relative to the yarn exit from the spinning unit, especially in terms of the yarn distribution means used.

The object of the invention is to simplify the device for lower yarn distribution on rotor spinning machines and thus to make them cheaper.

SUMMARY OF THE INVENTION

The object of the invention is achieved by a method of lowering the yarn at a working station of a rotor spinning machine, which is characterized in that the yarn is repeatedly deflected from its straight path only to one side under the action of the lower guide means. it returns back to its straight path and the yarn is in contact with one wall of the lower guide means during this return, thus making it possible to form a simpler and therefore cheaper device for lowering the yarn on the rotor spinning machines.

The essence of the device for lower yarn distribution on rotor spinning machines is that the lower yarn distribution means is formed by a projection situated in front of the distributor rod and at least one side of the projection is adapted to contact the yarn.

The projection forming the bottom distributor means simplifies the apparatus for the bottom distributor.

According to a preferred embodiment, the projection is formed by a cylindrical pin.

The cylindrical pin is simple to manufacture, perfectly fulfilling its function and its mounting on or in the guide rod is simple and unpretentious.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is schematically shown in the drawing, wherein FIG. 1 shows a front view of a part of a rotor spinning machine, FIG. 2a shows a front view of a guide rod of a lower yarn distribution device in detail A of FIG. 1; 2a and 3 show a view of the yarn bottom distribution device at one workstation showing the yarn limit positions in the bottom distribution.

DETAILED DESCRIPTION OF THE INVENTION

The method of lowering the yarn at a working station of the rotor spinning machine and the apparatus for carrying it out is applied to a rotor spinning machine, which comprises at least one row of side-by-side working stations.

Each work station comprises a spinning unit 1 situated at a level above the site for the slivers 2 with the sliver 3 of fibers. In the spinning unit 1, the sliver 3 is transformed in a known manner into a yarn 4, which is withdrawn from the spinning unit 1 by the yarn draw-off device 5 situated above the spinning unit 1. The yarn draw-off device 5 at each work station comprises a known pair fixed and one is thrust and at least one of them is coupled to the drive. In its section between the outlet of the spinning unit 1 and the yarn withdrawal device 5, the yarn 4 passes through the yarn lowering device 6. At the level above the yarn draw-off device 5, other devices and devices of the rotor spinning machine are situated.

The yarn lowering device 6 comprises a guide bar 60, which is situated above a number of spinning units even in the machine length direction, the yarn 4 being in front of the guide bar 60 in front of the guide bar. in the direction of its length, that is to say in the direction of a number of workstations, and for this purpose it is coupled with a suitable drive for exerting its reciprocating motion.

At the point above the yarn outlet 4 of each spinning unit I, the guide rod 60 is provided with a lower yarn guide means 4 formed by just one projection 61 situated in front of the guide rod 60. In the illustrated embodiments, the projection 61 is formed by a cylindrical pin. The protrusion 61 may be mounted either on the outer surface of the distributor rod 60, eg by means of a suitable sleeve or by gluing, or it may be embedded in the body of the distributor rod 60, eg in a suitable hole in the distributor rod 60. means.

-2GB 298574 B6

In the lower distribution of the yarn 4 at the rotor spinning machine, the yarn 4 exiting the spinning unit 1 is subjected to a lower distribution means with a linear reciprocating movement in the machine length direction and the yarn 4 is forced therefrom from its straight path between its exit from the spinning unit 1. and a winding device only to one side in the machine length direction, as shown in FIG. 3, over a range of widths of the yarn draw-off rollers 5, then reversing the operation of the distributor rod 60 with the lower distributor means returning to the yarn outlet level 4 from the spinning device As a result of its tension, the yarn 4 returns to its straight path between its output from the spinning unit i and the winding device, in contact with the lower distributor at all times.

To protect the bottom guide means from damage to the yarns 4, at least one side of the bottom guide means is adapted to contact the yarn 4, for example by suitable surface treatment of the bottom guide means or by selecting a suitable material of the bottom guide means or combinations of material and surface finishes of the bottom guide means etc.

In order to better utilize the width of the yarn draw-off rollers of the yarn draw-off device 5 from the spinning rotor, the draw-off rollers are not situated symmetrically along the yarn exit axis from the spinning unit 1, but displaced laterally in the yarn 4 1/2 the magnitude of the longitudinal movement of the transverse projection.

Claims (3)

1. A method of lowering a yarn at a rotor spinning machine having at least 30 rows of workstations, wherein the yarn exiting the spinning unit is treated by a lower distributor with a linear reciprocating movement in the machine length direction, thereby repeatedly deflecting the yarn from its straight line. paths in the range of at least part of the width of the yarn draw-off rollers, characterized in that the yarn (4) is repeatedly deflected from its straight path only to one side under the action of the lower guide means, 35 after each deflection to this one side, the yarn (4) returns to its straight path and the yarn (4) in this return contact with one wall of the lower guide means, thereby making it possible to make a simpler and thus cheaper device for lower yarn distribution on rotor spinning machines. 40 A device for lower yarn distribution on a rotor spinning machine, which comprises a guide rod reciprocably adjustable in its length direction arranged along a row of rotor spinning machine workplaces between the spinning units and the yarn drawers from the spinning units of said row of workstations. with a drive and in the region of each work station, above the yarn exit from the spinning unit is provided with a lower yarn distributor means, characterized in that the lower yarn distributor means (4) is formed by a projection (61) situated in front of the distributor rod (60) and at least one side of the projection (61) is adapted to contact the yarn (4). Device according to claim 2, characterized in that the projection (61) is formed by a roller pin.