Electromagnetic Device for Eliminating a Yarn Loop when Winding Yarn on a Cross-Wound Bobbin on a Spinning Machine at a Constant Speed of the Yarn Production

Abstract

The invention relates to an electromagnetic device for eliminating a yarn loop during the process of winding yarn on a cross-wound bobbin on a spinning machine at a constant speed of the yarn production, which comprises a cylindrical two pole magnet (1), which is connected to a compensatory arm (5) of a yarn loop and which is mounted rotatably about its longitudinal axis between two pole pieces (20, 21) of a magnetic core (2) of a coil (4), which are situated opposite each other, whereby on the side remote from the cylindrical two-pole magnet (1) and the pole pieces (20, 21), the magnetic core (2) passes through the electrical coil (4) connected to a source of electrical energy and to a control device. The magnetic core (2) is interrupted in the cavity of the coil (4) and a two pole permanent magnet (3) is located at the point of its interruption.

Claims

1. An electromagnetic device for eliminating a yarn loop during the process of winding yarn on a cross-wound bobbin on a spinning machine at a constant speed of the yarn production, which comprises a cylindrical two pole magnet (1), which is connected to a compensatory arm (5) of a yarn loop and which is mounted rotatably about its longitudinal axis between two poles (20, 21) of a magnetic core (2) of a coil (4), which are situated opposite each other, whereby the magnetic core (2) on the side remote from the cylindrical two-pole magnet (1) and from the pole pieces (20, 21) passes through the electrical coil (4), which is connected to a source of electrical energy and to a control device, characterized in that the magnetic core (2) is interrupted in the cavity of the coil (4) and a two pole permanent magnet (3) is located at the point of the interruption of the magnetic core (2).

2. The electromagnetic device according to claim 1, characterized in that the magnetic core (2) is composed of a pair of C-shaped elements oriented opposite each other, whereby one of their ends is formed by pole pieces (20, 21) of one end of the magnetic core (2), whereas their other end is arranged in the vicinity of the permanent magnet (3) or abuts against it.

Description

DESCRIPTION OF DRAWINGS

[0009] The invention is schematically represented in the enclosed drawings, where

[0010] FIG. 1 shows a functional diagram of the arrangement of the device according to the invention and

[0011] FIG. 2 shows an exemplary 3D embodiment of the device according to the invention.

EXAMPLES OF EMBODIMENT

[0012] The invention will be described using exemplary embodiments of arrangement and functioning of an electromagnetic device for eliminating a yarn loop at a workstation of a spinning machine between a drawing-off mechanism of yarn from a spinning unit and a winding device of yarn on a cross-wound bobbin. The workstation as such is well-known in the art and therefore here it will be described only symbolically without a drawing. The spinning machine comprises at least one row of identical workstations arranged next to each other, each of which comprises a spinning unit in which yarn is formed. Above the spinning unit is located a drawing-off mechanism of yarn. The drawing-off mechanism of yarn comprises a well-known pair of rollers, between which the yarn passes and which are mounted in the machine frame. One of the drawing-off rollers is coupled to an unillustrated drive and constitutes a driven drawing-off roller, whereas the other roller is a pressure drawing-off roller, which is rotatably mounted on a spring-loaded arm, which pushes it onto the driven drawing-off roller. In the yarn path behind the drawing-off mechanism is disposed a winding device of yarn on a cross-wound bobbin, which comprises a yarn traversing device, by which the yarn being wound is traversed across the width of the bobbin. The device for eliminating a yarn loop is arranged at the workstation in the yarn path between the drawing-off mechanism and the winding device, in this case it is an electromagnetic device for eliminating a yarn loop.

[0013] The electromagnetic device for eliminating a yarn loop comprises a cylindrical two pole magnet 1, on which is mounted a compensatory arm 5 of a yarn loop, whereby the cylindrical two pole magnet 1 is mounted rotatably about its longitudinal axis between two pole pieces 20, 21 of the magnetic core 2 situated opposite each other. The pole pieces 20, 21 of the magnetic core 2 have a profile (shape) of their heel portion, which is preferably in the form of a radius, affects the range of oscillation or the working range of the compensatory arm 5. The profile (shape) of the heel portion of the pole pieces 20, 21 is optimized in relation to the profile (shape) of the cylindrical two pole magnet 1, as well as in relation to an air gap between the heel portion of the pole pieces 20, 21 and the cylindrical two pole magnet 1, taking into account the magnetic flux from the cylindrical two-pole magnet 1. Preferably, the magnetic core 2 is made of magnetically-soft steel.

[0014] At its other end, i.e. on the side remote from the cylindrical two-pole magnet and from the pole pieces 20, 21 of the magnetic core 2, the magnetic core 2 is interrupted and a permanent magnet 3 is situated in the formed gap. In principle, the magnetic core 2 consists of a pair of identical C-shaped bodies oriented opposite each other, whose ends on one side constitute pole pieces 20, 21 of one end of the magnetic core 2 and whose other ends are arranged in the vicinity of the permanent magnet 3 or they abut against it. The magnetic flux caused by the permanent magnet 3 is in comparison with the magnetic flux of the cylindrical two pole magnet 1 comparable. The permanent magnet 3 by its magnetic flux affects the characteristics of the magnetic field in the area around the pole pieces 21, 20 so that it extends the possible working angle of turning of the cylindrical two-pole magnet 1 and thus the amplitude of the extreme positions of the compensatory arm 5 to a range (greater than 90) without twisting the cylindrical two-pole magnet 1 due to the influence the magnetic poles of the cylindrical two pole magnet 1 and the pole pieces 20, 21 of the magnetic core 2, which are attracted to each other.

[0015] Around the permanent magnet 3 and the abutting ends of the magnetic core 2 is situated an electrical coil 4, which is connected to a source of electrical energy for its excitation according to the instructions of the control device. Thus, the magnetic core 2 is substantially the core of the electrical coil 4.

[0016] The cylindrical two pole magnet 1, the electrical coil 4 and the permanent magnet 3 generate a common magnetic flux 6. To improve control, the compensatory arm 5 and/or the cylindrical two pole magnet 1 is aligned with at least one sensor 8 of the position of the compensatory arm 5, which is connected to the control device.