FR2621603A3 - BALL THREAD TENSIONING DEVICE, PARTICULARLY FOR DOUBLE TORSION SPINDLES - Google Patents

Abstract

Elements 19 with obturate openings 24 by balls 21 for the passage and tension of the wire 14 are mounted in a housing 26 of a body 25 which is pierced with an axial hole 31 through which passes a fixed tube 30 so that when the body 25 is moved axially in a support 17, this tube 30 passes through the openings 24, separates the balls 21 on the side and serves as a guide for the threading of the wire 14.

Description

262 1,603

  The invention relates to a ball wire tensioning device, in particular for double twist pins,

  of the type in which a number of beads are housed respec-

  in wire guiding elements which are sensi-

  funnel-shaped and arranged superimposed inside a wire spool holder. The balls which have a diameter less than the maximum diameter of the funnels, but greater than that of the lower openings of the latter, rest by the effect of gravity in the bottom of the funnels, at the level

openings.

  The soft wire is guided through these openings and is tensioned by the weight of the balls while it is being unwound

  from the spool to be twisted. The balls oblige, in pra-

  tick, the thread to follow a tortuous course, by serving in

  same stopping time of the twists which are done downstream of the arrangement

  thread tensioner under the effect of the spindle rotation.

  These wire tensioning devices prove to be inconvenient to use

  when it is necessary to thread the thread, at the start of work.

  For this operation, it is indeed necessary to move the balls from their rest position at the openings, so that the

  wire can be introduced correctly through these.

  Threading is generally carried out using a semi-rigid nylon needle, one end of which is inserted into the support, while a piece of thread to be threaded is fixed at the other end. The needle is passed through the openings which follow one another, progressively spreading the balls which return to their initial position after the

needle passage.

  It is clear that this operation is tedious and slow and that it must be carried out manually, with an additional economic cost due to the prolonged shutdown of the

  pins and as a result of the cost of labor.

  Automatic threading of the suction type is not usable, because the suction which must take place on the side of the outlet of the wire tensioning support, would have the more effect of holding the balls in the closed position of said openings, than of them move it away to allow the passage of the wire. The main object of the invention is to provide a ball wire tensioning device, in particular for double twist pins, which allows automatic threading of

  the end of the wire through the spool holder.

  To achieve this objective, there is proposed, according to the present invention, a ball wire tensioning device, in particular for double twist pins, comprising a substantially cylindrical support capable of receiving a

  coil of wire and internally having a plurality of elements

  wire guiding elements respectively having sub-

  both funnel-shaped and aligned along the axis of the support, in which these parts respectively contain thread tension balls and the extreme thread guide elements are in communication respectively with an inlet and an outlet for the wire, this device being characterized in that the wire guiding elements are arranged in a housing body carried by the support and inside this support

  is arranged an axial wire guide tube having an ex-

  end capable of spreading the balls transversely, the housing body or the axial tube being able to be moved in

  axial direction with respect to each other between a position of

  spinning of the wire at which the tube crosses the wire guide elements and keeps the balls spaced from the axis of these elements by connecting the inlet and the outlet of the wire to each other, and at least one position of work to which the tube

  leaves at least part of the beads free.

  Advantageously, in a device of this type, a simple and brief relative axial movement between the body of

  housing and the wire guide tube, preferably a

  axially of the housing body relative to the wire guide tube, allows the distance of all the balls from

  their closed position of the openings of the parts in

  black of the wire guide elements of the device, due to the fact that the axial tube displaces the balls transversely passing through these openings and provides direct communication between the inlet and the outlet of the device, which allows a

  easy and quick threading. This threading is executable easily.

  by suction through the same axial tube which freed the passages of the wire guiding elements. To guarantee the spacing of the balls in the transverse direction, the guide tube

  axial can have its upper end cut obliquely.

  During the reverse operation, the relative distance between the cylindrical housing body and the wire guide tube causes

  automatically return the balls to their respective positions

  tive shutter openings, in the bottom of the funnel parts of the wire guide elements, to which they

act on the thread introduced.

  Other features and advantages of the invention

  tion will emerge from the detailed description which follows

  of a preferred nonlimiting example of embodiment of the invention; reference will be made to the appended drawings in which: FIG. 1 is an elevation view and partly in section of a spindle for double twist provided with a wire tensioning device according to the invention,

  - Figure 2 is an axial sectional view of a dis-

  positive wire tensioner according to the invention shown in its working position, - Figure 3 is an axial sectional view of the same wire tensioning device shown in its position suitable for

threading the thread.

  In FIG. 1, the reference numeral 10 designates a fixed structure for supporting a brocbe 11 for double twisting which supports with the possibility of rotation a part 12 serving as a pivot for a rotary disc 13 provided with an axial and radial passage, not shown further, for a wire 14 to which a double twist must be applied in a manner known per se. The rotation is communicated to the disc 13 by means of a belt 15

acting on part 12.

  The disc 13 rotates a wire tensioning device 16 comprising a substantially cylindrical support 17, capable of receiving a coil of wire 18 from which a wire 14 to twist unwinds. The route of wire 14 is indicated on the

from s s i n.

  The support 17 has internally, in a manner known per se, a plurality of elements 19 for guiding the wire (FIG. 2) arranged coaxially in alignment along

  the axis of the support 17 and having an inner conformation

  only in funnel 20 to each receive a corresponding ball 21 of thread tension. The end elements 19 for guiding the wire are in communication, respectively, with an inlet and an outlet for the wire, indicated overall by the

references 22 and 23.

  In the working position, the balls 21 rest by

  gravity in the bottom of the funnel parts 20 corresponding

  dances with the openings 24 of the elements 19, through which the wire 14 passes. At this position, the balls 21 cause the wire 14 to complete a tortuous course and bring it to understanding, as it

  is visible in figure 2, stopping at the same time the propa-

  gation upstream of the twists of the wire which are produced in

downstream of the device.

  The elements 19 for guiding the wire, preferably ceramic, are housed inside an essentially cylindrical housing body 25 which is displaceable in the axial direction

  in the support 17. To this end, the body 25 has an upper part

  rieure provided with a housing 26, elongated in the axial direction, for receiving

  tion of the elements 19 and a lower guide portion.

  At the upper end of the body 25 is a frustoconical head 27 tightening towards the outside, in which is formed the opening 22 for the entry of the wire 14 and which constitutes a gripping element for the axial movement of this body

  25. The head 27 also serves to hold in position the assembly of elements

  elements 19 for guiding the wire which are preferably spaced from one another by the interposition of annular separators 28 which are removably placed in the housing body 25. Inside the support 17, near its base, is fixed a holding body 29 which holds firmly in axial position an axial tube 30 for guiding the wire 14. This tube extends almost over the entire height of the support 17 and passes through an axial hole 31 in the lower part of the housing body 25. The upper end of the tube 30, capable of coming into contact with the balls 21 and of moving them on the side in a transverse direction, is advantageously cut obliquely. The tube 30 has an outside diameter slightly smaller than the diameter of the openings 24 of the elements 19, so as to

  to be able to pass through these.

  The balls 21 advantageously have a diameter allowing them to find a place next to the tube 30 when the latter

  penetrated through the elements 19.

  According to a particular aspect of the invention, the device has as many working positions as there are elements 19 for guiding the wire. Each of these working positions is stabilized by complementary stop means arranged between the support 17 and the housing body 25; these means may advantageously consist of seats 32 provided at various heights in the support 17 and capable of partially receiving a locking element 33, for example semi-spherical, introduced by elastic effect into a radial seat 34 of the housing body 25. The seats 32 are separated from each other in height by a distance which corresponds to the distance between the elements 19. Suitably, a seat 32a can also be provided for the threading position. For reasons of practical improvement, we can

  provide in the support 17 a longitudinal groove 35 defined-

  health by its ends of the end positions respectively

  tives for a nipple 36 screwed into a tapped hole 37 of a series

  holes arranged at various heights in the main body

  25, in correspondence with as many working positions.

  FIG. 2 shows a working position of the device according to the invention, in which the housing body 25 protrudes from the support 17 on the side of the entry of the wire 14 and the balls 21 rest on the openings 24 and ensure,

by gravity, the tension of the thread 14.

  To thread the wire 14, it suffices to return the housing body 25 to the support 17 by a rapid displacement in the axial direction downwards. This movement involves the penetration of the axial guide tube 30 into the openings 24 of the elements 19 at the same time as the cut end of the tube 30 moves the spheres 21 away from the respective openings 24 by spreading them in a transverse direction.

  overall with respect to the axis of the guide elements.

  All the balls 21 being separated, as shown in FIG. 3, it is possible to thread the wire 14 through the axial guide tube 30 which in this situation connects the inlet to

the device output.

  Threading can advantageously be carried out by suction through the axial tube 30, by the association of a

  suction pipe with the outlet of the support 17.

  When the wire 14 has been inserted, to return the balls 21 to their working position, it suffices to perform the opposite movement of the housing body 25 so that the tube leaves free the balls 21 which fall to the bottom of the elements 19.

  Note that the device described allows common

  denies modifying the tension of the wire 14, by changing the number of guide elements as a function. It suffices, in this regard, to put the housing body 25 in a position of

  different work, for example the one shown diagrammatically

  tick in phantom in FIG. 2 in which the tube 30 puts out of function a certain number of balls 21, separated in a transverse direction, only the balls located in the part

  upper end of the tube 30 remaining in operation. Unlike

  of other known ball thread tensioning devices, it is therefore not necessary, to modify the thread tension, to remove the unused guide elements; the time required to adjust is therefore considerably reduced

the degree of thread tension.

  The preceding description makes it clear how

  a thread tensioning device according to the invention enables the threading operation to be carried out quickly and automatically, as well as easily modifying the degree of thread tension

  by simple axial movements of part of the device.

  Instead of making the housing body 25

  axially directional, this body could be made fixed and the axial guide tube 30 of the wire could be made to move axially. This movement could be achieved, for example, pneumatically, by securing with the tube 30 a part having the

  function of a piston sliding in the support 17.

s 2621603

Claims (11)

  1. Ball wire tensioning device, in particular   tray for double twist pins, comprising a substantially cylindrical support capable of receiving a spool of wire and internally having a plurality of elements   wire guide having respectively substantial parts-   LEMENT funnel-shaped and aligned along the axis of the support, in which these parts respectively contain thread tension balls and the extreme thread guide elements are in communication respectively with an inlet and an outlet for the wire, characterized in that that the elements (19) for guiding the wire are arranged in a housing body (25) carried by the support (17) and inside this support (17) is disposed an axial tube (30) for guiding the wire having an end capable of spreading the balls (21) in a transverse direction,   the housing body (25) or the axial tube (30) being displaced   axially strung relative to each other between a threading position at which the tube (30) passes through the elements (19) for guiding the thread and keeps the balls (21) spaced from the axis of these elements (19) by connecting the inlet and the outlet of the wire to each other, and at least one working position at which the tube (30) leaves at least one part of the balls (21).   2. Device according to claim 1, charac-   terized in that the housing body (25) is movable in   axial direction in the support (17) and at least at said posi-   single work, protrudes from the support (17) on the side of wire entry.   3. Device according to any one of the res-   dications 1, 2, characterized in that the upper end of the tube (30), intended to come into contact with the balls (21) is cut obliquely.   4. Device according to any one of the res-   dications 1 to 3, characterized in that the housing body (25) is cylindrical and comprises an upper part provided with a housing (26) de.la plurality of elements (19) for guiding the wire and a lower part having a axial hole (31) of   passage for the axial tube (30) for guiding the wire.   5. Device according to claim 4, characterized in that the elements (19) for guiding the wire are placed   removably in said housing (26).   6. Device according to claim 1, character-   laughed at in that it has as many work positions as there are   elements (19) for guiding the wire.   7. Device according to any one of the claims.   cations 1 to 6, characterized in that the housing body (26) has at its upper end a head (27) constituting a gripping means for the axial movement of this body (26) at its various positions.   8. Device according to any one of the res-   dications 1 to 7, characterized in that the housing body (25) and the support (17) have complementary stop means (32, 33, 34) which cooperate for the locking of said body   housing (26) at each of said positions.   9. Device according to any one of the res-   dications 1 to 8, characterized in that at the outlet of the support   (17) is associated with a suction duct for self-threading wire material.   10. Device according to any one of the res-   dications 1 to 9, characterized in that the axial guide tube (30) extends practically over the entire height of the support (17).   11. Device according to any one of the res-   dications 1 to 10, characterized in that the axial guide tube (30) has an outside diameter slightly smaller than the diameter of the openings (24) of the elements (19) for guiding the wire.