FR2676756A1 - RING SPINNING DEVICE. - Google Patents

Abstract

The invention relates to spinning. To ensure that advantageous spinning conditions are obtained for a ring spinning device, there is provided in the region of the guide ring (5) which receives a slider (4), a return track (10) which encircles it. 'axis of the spindle, to return the wire (3) arriving at the cursor (4), the wire strand (3) arriving from the return track (10) to the cursor (4) forming with the wire strand (3b) which starts from the cursor (4), an acute angle (alpha) in the cursor region, projecting into a plane that contains the axis of the spindle. Main application: high speed wire spinning.

Description

The invention relates to a device for

  ring gear comprising a drivable pin

  and intended to receive a coil and a guide ring

  coaxial to the axis of the spindle, on which a cursor turns which forms a guide for the wire.

  In ring spinning devices, the

  fiber drawn by a drawing train is conveyed

  to a spool mounted on a spindle driven through

  a ring spinning guide that is usually

  constituted by a cursor which turns on a ring of

  concentric with the coil; the cursor is nested

  on the ring by two branches that surround the runway

  the cursor on both sides, and it forms an eyelet of

  to guide the thread fed to the spool, so that the thread arriving at the rotating spool drives the slider Each turn of the slider gives a twisting turn of the thread while the rotation speed difference between the spool, which is in advance, and the slider, which is late, determines the winding speed of the wire Centrifugal forces that develop, which act, on the one hand, on the slider and, on the other hand, on the fiber strand driven in rotation around the spool with the aid of the slider and which is thus twisted to become a thread, combined with the guiding forces acting on the thread, exert on the slider a tilting torque oriented transversely to the slider track; which leads to an increase in

  friction and, in the presence of a corresponding increase

  the speed of rotation of the cursor, to a

  thermal stress which would be unacceptable in

skirted.

  If the guide ring is itself rotatably mounted

  tif (AT-B-25 366), the friction forces that

  cent between the slider and the guide ring causes the rotating guide ring to be driven, which, if the rotational speed of the slider around the

  coil is comparable, leads to a reduction in

  However, because of the tilting torque exerted on the slider

  the slider, resulting from the centrifugal force, the

  slack applied to the slider is considerable, so that the life of the slider at high speeds of

rotation is greatly reduced.

  The invention therefore aims to improve

  a ring spinning device of the kind defined in the beginning with simple means so as to make it possible to obtain high speeds of rotation of the slider without having to fear a reduction in the duration of

slider life.

  The invention solves this problem by the fact that, in the region of the guide ring, there is provided a return track encircling the coil acting on the wire

  arriving at the cursor, the strand of thread that arrives at the cur-

  from the return runway forms with the

  strand of thread from the cursor in the area of the cur-

  an oc angle of less than 900 in projection on a

  plane that contains the axis of the spindle.

  By providing a return track that surrounds the

  coil and along which the wire is guided and

  during the rotation of the slider around the guide ring so that in the region of the slider a sharp angle is formed between the incoming wire strand and the departing wire strand, projected onto a plane which contains the axis of the spindle, the tension of the thread exerts on the slider a centripetal force which is antagonistic to the tilting torque due to the centrifugal force and which

  gives the cursor an advantageous sliding attitude.

  This has the advantage of considerably reducing the forces

  of friction between the cursor and the

  guidance, which translates into longer life times

  very advantageous even in the case of very large

rotations of the cursor.

  The resulting thread tension that acts

  the slider is oriented along the bisector of the

  The distance between the wire strand that reaches the slider and the strand of wire that starts from the slider Since the path of the wire strand between the slider and the coil is predetermined within relatively narrow limits,

  In order to ensure the development of a

  sufficient farting by means of the tension of the thread, maintain an angle of less than 900 between the strand of thread

  the cursor and the strand of thread from the cursor

  jection on a plane which contains the axis of the spindle, it must be taken into account that both the yarn

  arriving at the cursor than the strand of thread leaving the cur-

  are located outside this plane of projection, so that the real angle between these strands of wire can even

  greater than 900 without going beyond the conditions

  for the actual direction of the resulting tension.

  aunt of the wire in relation to a plane perpendicular to

  In particular, we obtain effective direction in advance of

  The result of this choice of dimensions is not only the centripetal force exerted on the slider which is advantageous for maintain the latter in a preferred sliding attitude but it also allows to maintain

  a greater axial distance between the guide ring

  ge and the return runway, which simplifies the possibility of

  access to the cursor, especially where the distance

  this axis between the guide ring and the track of

void is at least 4 mm.

  Since the axial distance between the pistons

  the guide ring has an influence on the path of the wire between the return track and the slider, the wire return track can be mounted to

  can be adjusted in the axial direction to allow

  to adapt the device in a simple way to the conditions

each case.

  The effect that the return of the wire on the return track exerts on the sliding attitude of the slider is independent of the rotational or non-rotational mounting of the return track. In the case of a rotational mounting of the guide ring, which allows greater rotational speeds for the slider, the return track can be coupled integrally in rotation to the guide ring, which has the effect that, as a result of the friction forces between the wire and the return track , he

  can be exerted on the guide ring a couple that makes

  vorise the drive of the rotating guide ring

  without causing additional stress on the cur-

  sor. Since the rotation of the ring

  guiding the friction between the cursor and the

  the guide wire and also by the friction between the incoming wire strand and the return track if the wire return track is mounted on the guide ring, it settles, due to fluctuations in resistance to

  rotation and fluctuations in friction conditions

  variations in the rotation speed of the year

  guide, which creates variations in the conditions

  In order for these guiding conditions to be pre-determined by construction, the rotatably mounted guide ring can be rotated in the direction of rotation of the slider to a position of rotation.

  predetermined time, so that the lifetime of the cur-

  it no longer depends on the hazards that affect the speed of rotation of the guide ring The drive of the guide ring also allows to raise

  the speed of the ring spinning device in con-

  In a simple way, this also has a favorable influence on the life of the slider. The driving of the guide ring can be carried out in different ways. However, particular drive conditions are obtained. advantageous in the case where the spinning devices to

  ring are placed in series in a commonly used

  In such a case, the guide ring can be carried by a bearing ring which is formed by the tangential belt drive.

  inner ring and the outer ring of a bearing.

  Due to unavoidable differences

  the thickness of the wire and the resulting differences

  of the diameter of the coil, it is to be expected that variations in the tension of the

  during a turn of the cursor, variations that have a

  unfavorable influence on the sliding attitude of the cur-

  relative to the guide ring To compensate for these variations in the thread tension, the return track of the incoming thread may have a distance to the axis of the spindle which varies along the periphery of the return track between an upper limit value and a lower limit value, in order to excite vibrations of the wire As a result of the variation of the distance of this return track to the axis of the spindle along the periphery of the return track , and therefore the distance between this return track and the coil

  coaxial with the axis of the spindle, the thread arriving at

  is excited in vibrations the amplitude of which is

  undermined by the predetermined difference between the

  upper limit and the lower limit of the

  between the return track and the spindle axis, and

  which have a high frequency which depends on the

  speed of the cursor These vibrations are super-

  the vibrations of the wire, which are of a low frequency

  are compared to these, and which manifest themselves

  by a variation in the size of the balloon of the wire and

  this with the surprising effect of compensating for the influence of these low frequency vibrations of the wire on the attitude

  cursor and to ensure the cursor a very stable attitude.

  which is an essential condition for ob-

  long slider lifetimes.

  The excitation of the high-frequency vibrations can be obtained in different ways. Thus, for example, it is possible to arrange a circular return track for the wire arriving at the cursor in an eccentric arrangement with respect to the axis of rotation. the spindle, to give the return track a shape different from that of the circular track coaxial with the axis of the spindle, which is necessary for the excitation of the vibrations of the wire The simplicity of construction of the return track which is related to this structure however only allows to obtain a vibrational frequency

  which corresponds to the frequency of the cursor rotation.

  If one wants to obtain higher frequencies of vibration of the wire, it is necessary to envisage a return track which deviates from the circular form, for example which

  has the shape of an oval, but which can be

  coaxially to the axis of the spindle.

  Naturally, vibra-

  the high frequency of the wire leads to a demand for

  inadmissible addition of the wire To obtain

  advantageous tension conditions, it is recommended that

  to determine the difference between the limit value

  lower and the lower limit value of the distance from the return track to the pin axis depending

  the length of wire that is fed to the coil

one turn of the cursor.

  In the drawing, the object of the invention is

  By way of example, in this drawing, FIG. 1 shows a ring spinning device according to the invention in a diagrammatic axial sectional view; Figure 2 shows a ring spinning device with a partially cutaway top view; FIG. 3 shows the guide of the wire in the region of the slider, by an axial section passing through the guide ring on a larger scale;

  FIG. 4 is a representation, corresponding to

  FIG. 1, a constructional variant of a ring spinning device; Figure 5 shows a row of

  ring spinning of the same type by a schematic top view.

matic;

  FIG. 6 represents another form of embodiment

  sation of a spinning device according to the invention in a schematic top view; FIG. 7 shows the guide of the wire in the region of the cursor, in the embodiment according to FIG. 6, by a view corresponding to FIG.

larger scale.

  The ring spinning devices shown are essentially composed of a spindle 1 driven

  in a traditional way, intended to receive a bobbin

  No. 2, to which the yarn 3, which is to be produced starting from a strand of drawn fibers, is conveyed via a usual slider 4, which forms a yarn guide eyelet and circulates On a guide ring 5 While this guide ring 3 is held locked in rotation in Figures 1 to 3, in the case of Figures 4 and 5, it is carried by a bearing ring 6 which is rotatably mounted in a frame 8 by means of a bearing 7 This mount 8 can be recessed

  in a platinum ring 9 in the usual way, com

  the rotatable ring of the guide ring 5 makes it possible to reduce the relative rotational speed of the slider 4

  relative to the guide ring 5 without reducing the vi-

  rotation of the slider 4 relative to the reel 2 or relative to the ring plate 9, which reduces

the constraint imposed on the cursor.

  However, irrespective of the rotational or non-rotational mounting of the guide ring 5, one has to look at

  to obtain an advantageous sliding attitude of the cur-

  4 This result is achieved by means of a return track 10 surrounding the coil 2, constituted by a sliding ring which is

  disposed at a small axial distance above the year

  5, and which has a smaller diameter

  inside the guide ring 5 To give

  to the annular guide track 10, provision is made for

  fixing ring 11 which is supported on the body of

  Se of the guide ring 5 (Figure 1) or on the ring

  6 (Figure 4), and which has brackets for

  12 to which the return track 10 is fixed. The friction forces between the return track 10 and the

  thread 3, which act in the direction

  In the case of the embodiment according to FIG. 4, in the case of the embodiment according to FIG. 4, a torque is generated which is exerted on the guide ring 5, which is thus driven, while at the same time discharging the stresses of the slider 4. most favorable conditions for the speed of rotation of the guide ring 5,

  can also associate with the guide ring 5 a drive

  positively, for example, training by cour-

  Tangential tang which cooperates with the bearing ring 6.

  The tangential belt 14 of this tangential belt drive 13 drives the bearing ring 6 which,

  for this purpose, surrounds mount 8 by presenting a

  curved 15 which receives the tangential belt, as can be seen in Figures 4 and 5 With this

  available, the differences in resistance to rota-

  such as those resulting from the variations

  lubrication conditions of the bearing 7, do not risk

  not affect the speed of rotation of the ring

guide 5.

  The wire 3 which is returned to the return track is oriented between the return track 10 and the cursor

  4 in such a way that the strand of wire 3 has reached the curvature

  4 form with the strand of wire 3b starting from the cursor

  4, an acute angle r <in projection on a plane which

  holds the axis of the spindle, plane which is represented by the plane of the drawing as can be seen in particular in Figure 3 The resultant force acting on the slider

  4, which is oriented along the bisector of the angle

  m between the strands 3a, 3b of the wire, and which is generated

  by the tension of the wire, compensates the couples of

  acting on the slider 4 and which result from the centrifugal force, at least to an extent that allows the slider 4 to take advantage of the support on the guide ring, which decisively reduces the stress

applied to the cursor.

  However, the tension of the thread itself may vary, due to the fact that the thickness of the thread is not

  uniform and that winding conditions on the bobbin

  2 are not uniform, which is manifested by a variation of the diameter of the balloon of wire which is formed during the rotation of the wire around the coil, and acts on the equilibrium position of the cursor 4 which, consequently,

  can tip over and be exposed to considerable wear-

  To reduce this influence to an insignificant level, the profile of the return runway can be

  different from a concentric circular form to the bro-

  1, as can be seen in Figures 6 and 7

  it means that the distance a between the return track and the axis of the spindle varies along the periphery

  of the reference runway 10, between a maximum limit value

  a and a lower limit than, so that

  following the variation of the distance, wire 3 is exci-

  in vibrations which are of a high frequency compared

  to the fluctuations of the wire due, for example, to

  variations in winding conditions, and which

  A slider attitude of the slider 4 is shown in Figure 7.

  wire path in the region of the lower limit value

  than the distance a and, in comparison, the distance

  line drawn in continuous line in the region of

  their upper limit% of the distance a, where we can

  see directly the effect of this provision.

  According to the exemplary embodiment shown, the return track is represented in the form of an oval

  or an ellipse However, it is not absolutely ne-

  it is necessary to provide for referral lines deviating from

  the circular shape to get the excitement of vibra-

  wire 3 It is sufficient to have a slip ring

  in the form of a circle ring in an eccentric position with respect to pin 1; by acting on the eccentricity, one has a simple possibility of adjusting the amplitude of the vibrations, which one adjusts

  then, for example, by trial and error.

Claims (11)

R E V E N D I C A T IO N S   A ring spinning device comprising a drivable pin for receiving a spool, and a guide ring coaxial with the spindle axis, on which a slider which forms a guide for the thread is rotated, characterized in that in the region of the guide ring (5) there is provided a return track (10) encircling the spool (2), which acts on the thread (3) arriving at the slider (4), the yarn strand ( 3 a) which arrives from the return track (10) to the slider (4), forming with   the strand of thread (3b) which starts from the cursor (4), in the   slider, an angle (c-) of less than 90 in   on a plane that contains the axis of the spindle.   2 Ring spinning device according to the invention   1, characterized in that the return track   (10) acting on the wire (3) has a smaller dia-   inner meter as the guide ring (5).   3 Ring spinning device according to the invention   1 or 2, characterized in that the tracking track   (10) acting on the wire (3) is mounted so as to   can be adjusted in the axial direction.   4 Ring spinning device according to one of   claims 1 to 3, characterized in that the track of   return (10) of the wire (3) has a smaller diameter   than the guide ring (5).   Ring spinning device according to the invention   4, characterized in that the return track (10) of the wire (3) is integrally rotatably coupled   to the rotatably mounted guide ring (5).   6 Ring spinning device according to one of   Claims 5 to 5, characterized in that the ring   rotatably mounted guide (5) can be driven with   predetermined rotation speed in the rotational direction slider (4).   7 Ring spinning device according to the invention   6, characterized in that the guide ring   (5) may be driven by means of a tangential belt tielle (14).   8 Ring spinning device according to one of   Claims 1 to 7, characterized in that the track of   return (10) of the thread (3) has a distance (a) to the axis of the spindle which varies along the periphery of the return track (10), between an upper limit value and a lower limit value (ao). , au), to excite vibrations of the wire.   9 Ring spinning device according to the invention   8, characterized in that the return track (10) consists of an eccentric circular track relative to the axis of the spindle.   Ring spinning device according to the   8, characterized in that the return track (10) has an oval shape.   11 Ring spinning device according to one of   Claims 8 to 10, characterized in that the difference   this between the upper limit value and the lower limit value (O, Au) of the distance (a) between the   (10) and the axis of the spindle is calculated   the length of wire fed to the coil (2) one turn of the cursor.