US2747360A

US2747360A - Dampened thread guide

Info

Publication number: US2747360A
Application number: US361783A
Authority: US
Inventors: Vella Luigi
Original assignee: Individual
Current assignee: Individual
Priority date: 1952-05-07
Filing date: 1953-06-15
Publication date: 1956-05-29
Anticipated expiration: 1973-05-29

Description

May 29, 1956 VELLA I 2,747,360

DAMPENED THREAD GUIDE "Filed June 15, 1953 4 Sheets-Sheet 1 Enaananahqafi May 29, 1956 L. VELLA DAMPENED THREAD GUIDE Filed June 15, 1953 4 Sheets-Sheet 2 May 29, 1956 L. VELLA DAMFENED THREAD. GUIDE 4 Sheets-Sheet 3 Filed June 15, 1953 May 29, 1956 L. VELLA 2,747,360

DAMPENED THREAD GUIDE Filed June 15, 1955 4 Sheets-Sheet 4 15 f v 20 -J 16 as 39 F I G. 9

FIG. 8 4o 41 In v Gator .YEZZQ/ United States PatentD 2,747,360 DAMPENED THREAD GUIDE Luigi Vella, Cogozzo Valtrompia, Italy Application June 15, 1953,. Serial No. 361,783 Claims priority, application Italy May 7, 1952 8 Claims. (Cl. 57-108) My invention relates to a dampened supporting device for threadguidesin ring frames. In most ring frames as .used at present, the thread guides and the spindle rail are..fixed..- At the beginningof dofiing, the balloon is Wide and has a length proportional to the lift; then as dofiing proceeds, the balloon reduces more and more until. disappearingalmost completely towards the summit. of the pirn. ..To' this progressive reduction there corresponds, as is. known, a proportional increase of the tensions. in the thread, whichfinally attain values so high as. to overcome the. strength of the thread, breaking it and thus causing defectsin the yarn (unless reducing the speed of theframe materially). v i Devices have been. already devised which obtain a balloon that when the length ofmaximum yield is attained maintain said length constant. until terminating dofling and which preserves a convenient width. By reducing thus tominimum the variations which the balloon undergoes in length and Width, the tensions induced in the'thread are reduced to similar extent.

The. object of the present invention is an improvement for a dampened supporting device for thread guides of ring spinning.frames provided with tilting'bracket separators which possesses the abovementioned advantages andwhich presents alsoparticular characteristics tobe more particularly described afterwards. In these devices, has been found useful to transmit the motion to. the thread guides by means of a mechanism separate from the. ring carrier but synchronizedwith its motion by way of. a. dampening device. Forthis reason, the ring carrier plate. and the thread guides are carried by the spinning frame independent of one another in order to. permit variable relative displacement between the. ring carrier plateand the thread guides during the winding of the conical part and during the formation of the body of the (op.- I

Themov ements of the ring carrier plate and of the thread guides, though being derived from the same drive, follow two different paths, and while the motion of the ring; rail follows a constant law at every winding and from the start to the end of doffing, the motion of the thread guides is varied bya di-lferential member during winding :as well as from the start to the end of the dotfing; hence "the result is that the relative motion between the two members is variable, during the entire formation of the. cop.

During the stage of .dofliing with the frame at standstill, in order to favour the replacing of the full cops with empty pirns, the support of the thread can be lifted while the'circu lar separators pass automatically from horizontal position to vertical position at a determined point of lifting. a

The invention is hereinafter further described with reference to the accompanying drawing, which illustrates by way of example one embodiment of theinvention, viz.: Pig. 1 shows the. cross-section of the -thread guide mounted on the spinning frame in the starting position;

2,747,360 Patented May 2 9, 1956 ICC Fig. 2 shows the position of the ring carrier plate at the end of dofiing, in respect to the thread guides;

Fig. 3 shows the front arrangement on the ring. Of the members composing the telescoping assembly;

Fig. 4 shows the details of the cam member;

Fig. 5 shows the details and the position of the circular separators during winding;

Fig. 6 shows the details and the position of the, circular separators during doffing;

Figs. 7 and 8 show the positions of the compensating weight at the beginning and at the end of dofiing.

Figs. 9 and 9a show the mechanism for the dofling movement with the frame at standstill in order to extract the full cops- In the drawing have been indicated only those parts of a ring spinning frame which are necessary to under.- stand the, operation of the device according to the present invention. 8

The spindle rail 23 carries, fixed thereon, the blocks 24 which containthe pins of the rotary parts 25: whereon the empty pirns are fitted, and whereon the thread is wound in superimposed conical layers by means of the ring-carrying plate 2 in its reciprocating and progressive movement of cop formation; the draw frame 26 serves to support all the drawing members of the spinning frames.

The device according to the invention is composed of a tubular guide 4 fixed by means of the small support 5 to the drawing frame 26 within which guide slides freely a shaped piece 3 supporting a cross-piece-l carrying the thread guides 22. Said piece 3 is provided with longitudinal grooves 14 containing balls 14 which, interposed between piece 3 and guide 4, transform the sliding friction of the surfaces grazing each other into rolling friction diminishing the resistance and thus facilitating the regularity of movement of said pieces. The piece 3 in convenient position carries the rotary shaft 10 on which are'fixed between adjacent spindles, the circular separators 11 and the member 12 cooperating with the adjustable tilting nose 13-carried by the frame 26 (Figs. 5 and 6). On the small support 5, is the sheave 6 serving as a guide and transmission for the rope 7 that is driven to run from the pulley 9 on which its end is fixed, to effect vertical displacement of the piece 3 within the guide 4 and of course of all parts connected to said piece 3. A flexible drive 16 by way of pulley transmission 27 is. connected to a cam or differential member with variable *pmfilelS'fitted onto the shaft 20 on which there isg also solidly fixed the pulley 9, and said drive 16. :is connected to the small rod 17 whichextends into cylinder 18 and a return spring 19 surrounds the rod between the head on the rod and the upper end of the cylinder. The. cylinder 18 is fixed. to a rigid connection 21 which re-. ceives movement directly from the same members of the spinning frame that drive :the movement of the ring plate 2. during the operation of winding the thread. The ring carrier plate 2 is supported and driven by a number of columns 33 which rest on the ends of levers 36 fixed at their other ends to an oscillating bar 32 supported'in the frame and extending along the same. The oscillating movement of the bar 32 is effected by means of one or more segments 34 driven by chains 35 fixed to said segments. The cylinder 18 with its linkage 21 is pivoted to the end of a lever 31 which is also coupled to shaft 32. In such a manner, by lifting of the ring carrier plate 2, the cylinder 18 is always moved downwards and by each alternating movement of carrier 2-, a corresponding movement of the cylinder 18 takes place.

To the frame 26 there are also fixed the adjustable noses 13 which in cooperation with the shaped prisms 12 (Figs. 5 and 6) serve to operate the automatic tilting of the circular separators when the ring rail is displaced vertically beyond the normal working limit.

Operation of the thread guide is a follows; a The empty pirns are placed onto the spindles 25 and the ring plate is brought to the starting position (Fig. 1). Thus the ring plate 2 is located at the bottom'of the empty pirn, and the linkage 21 is displaced downwards by an amount sufficient to lock the small rod 17 with its projecting part 17a against the head of cylinder 18 (d=) while the guides 22 arein proximity to the tip of the pirn at a distance adjustable when setting up the machine. The cam member is in such a position that the rope 16 is tangent to its external profile at the pointof maximum distance from the axis of rotation, then the working cycle is started.

When the rail 2 starts its reciprocating movement for formation of the conical part and its progressive vertical movement for the formation of the body of the cop, the same movement is transmitted to the linkage 21 and by way of the cylinder and piston assembly 1819-17 (from the instant in which the frame starts its operation, its action being excluded as d becomes=0) it affects the flexible drive 16 as far as the cam 15. From the cam member through the shaft 20, this action is transmitted to the pulley 9, the flexible drive 7 and the mobile piece 3 thus affecting the thread guides 22 and the circular separators 11 fixed to said piece.

However, the movement of the thread guides, al though being derived from the same members that drive the ring plate, does not follow accurately the law of its motion, but by the eifect of the cam member interposed and its position in respect to the extreme points of operation, the relative movement between the thread guides and the ring plate is varied, that is, the various stages of the movements may be analyzed separately, as follows:

(A) At every stroke of the ring plate 2 in the formation of the conical part, that is to say in the movement of the plate from the base to the top of the winding cone, there is a limited displacement of the rope 16 generated by the linkage 21 which is displaced downwards and this displacement has always a constant value proportional to the displacement eifected by the ring plate 2. The displacement of the flexible drive 16 (e. g. towards the right in the drawing Fig. l) by a unitarian amount corresponding to one travel of the carrier 2, produces a unitarian angular rotation of the member 15, which rotation is proportional to the distance between the centre of rotation and the point of tangency of the rope 16 with the shaped profile at the considered instant, and this rotation may be e. g. that contained in the portion of profile defined by a, (see Fig. 4). This angular displacement is transmitted to the shaft and to the pulleys 9 fitted thereon, which absorb a section of rope 7 proportional to said angular displacement, then they cause movement of the pieces 3 and likewise of the thread guides 22 upwards. In this starting position, owing to the difference of the diameters on which the

flexible ropes

7 and 16 operate, for the same rotation imposed to the shaft 20, the rope 7 absorbed on pulley 9 is smaller than the section of the rope 16 developed by the cam 15, so as a consequence the thread guides 22 will be displaced-during the stroke or travel of the plate upwards-by an amount smaller than the displacement of said plate, that is, the relative distance between the ring carrying plate and the guides is reduced very much during the travels or strokes of the plate in this first stage of cop formation.

(B) Proceeding in work, the ring plate 2 besides effecting the reciprocating movement of formation of the conical part, displaces itself upwards at every stroke of said plate, for the formation of the body of the cop, hence the linkage 21 always acts in reciprocating manner progressively, displacing itself downwards. The flexible rope 16 comes to work on the cam 15 at points of tangency closer and closer to the centre of rotation, producing as a consequence, with equal unit displacement,

greaterand greater angular displacements a 0: a etc.; hence also the displacements of the thread guides in respect to the ring plate become greater and greater in respect to the beginning.

(C) Having attained a determined point in cop formation, wherein the conditions of operation are those of greatest yield, the rope 16 finds itself in the zone in which the profile of the cam has constant curvature and, hence, the angular displacements are directly proportional to the length of the rope released or absorbed; dilferentiation of the movements is effected no longer and the thread guide results to be endowed, in respect to the ring plate, with the same speed, and both perform the same displacement in synchronism until termination of dofling, see Fig. 2. Actually, from the beginning of doifing until attainment of the ideal conditions of operation, the length of the balloon diminishes progressively and, subsequently,from the ideal conditions on until completion of dofiing, the dimensions of the balloon are practically kept constant (see Fig. 2) and as a consequence thereof is obtained constancy of tensions in the thread eliminating'alrnost entirely breakages due to winding. I

When the cop is completely full with yarn (full dofiing), all of the members of the ring frame should be brought back to their starting positions and the full cops have to be replaced with the empty pirns. To this end, the ring rail is lowered as in'Fig. 1 and simultaneously the thread guides 22 will lower because the linkage 21 will be displaced upwards. 'After that operation, there is imparted a supplemental rotation to the shaft 20 by means of the mechanism shown in Figure 9 which will be now more particularly described. On shaft 20, there is also fixed a bevel gear 36 meshing with the corresponding bevel pinion 37 fixed on a second shaft 38 placed at with respect to the first and the end thereof projects from the frame 26 in such a way that a handle 41 can be fitted to such shaft. On shaft 38 is also fixed a ratchet 39 which can be locked by pawl 40 to prevent its rotation. During the operation of the ring spinning frame, pawl 40 is tilted backwards so that the ratchet 39 is not locked and shaft 38 participates in the alternating rotation movement of shaft 20.

When the drawing ofi is finished and the machine stopped, in order to extract the full cops, handle 41 is inserted on the square end of shaft 38 and turned in such a way to wind the rope 7' on pulleys 9, that is pieces 3 are lifted as far as the separators whereupon pawl 40 is lowered and the reverse rotation of the shaft prevented.v When the drawing off operation is over, pawl 40 is loosed and tilted and with handle 41 a reverse rotation is effected and pieces 3 return to the position at the beginning of the operation; the handle is removed and a new operation cycle is started. When a supplemental rotation in a clockwise direction is imparted to the shaft 20, the pieces 3 are lifted again upwards in such a manner that between the tips of the pirn 25 and the thread guide curls 22 it is possible to have a distance that may render it easy to remove the full cop in order to replace it with an empty pirn. I

During this supplementary stage of the lifting of the thread guides the prism tilter 12 with its sharpest edge comesat a certain point of its stroke-to strike the nose 13 of the frame 26, producing a clockwise rotation of the shaft 10 on which there are also fixed the circular separators 11, which in this manner are tilted upwards leaving free the space between one spindle and the other, facilitating to a greater extent the doffing operations. Simultaneously with the rotation of the shaft 20 in a clockwise direction and with the absorbing of the rope 7 on the pulley 9, there occurs also the rotation of the cam 15 rigid with the shaft 20 and the simultaneous re: lease of a section of the rope 16. p a

, These operations of course are performedwhile the ring frame laid down, and the linkageuzl also is at standstill and the section of rope developed from cam 15 is absorbed by the cylinder 18 due to the spring 19 which in expanding, returns the small rod 17 into the interior of the cylinder 18 until the head hits against the threaded tip of the linkage 21. Subsequently, after having completed the operation of dofling, the shaft 20 is turned in a reverse direction until bringing the thread guide 22 again to the proximity of the tip of the pirn (as at the beginning) and the separators 11 return to their horizontal position, whereafter the operation of the spinning frame will function again in a similar cycle.

All the members cooperating with one another are provided with special adjusting devices which permit the setting up of the individual members for the adjustments necessary to be made on the spinning frame in order to adapt the frame for specific kinds of work.

The invention provides a device for compensating the loads (Figs. 7 and 8) acting onto the shaft 20, formed by one or more shaped pulleys 29 carried by the same shaft 20. To the pulleys 29 there is fixed, by means of a flexible member on rope 28, a counterweight 30, the weight of which can be varied in order to adapt it to individual needs; the profile of the pulleys 29 and their fitting on the shaft 20 in respect to the cam are arranged in such a manner that at any instant the shaft 20 is acted upon always by two couples producing two moments the sum of which is almost constant even with the continuous variation of the arms of rotation of the linkage 16 on the member 15. This arrangement is useful in order to make possible the most accurate possible balancing of the weight of the whole assembly of the thread guides and relative guides during the work of the spinning frame; said weights act on the shaft 20 with a constant momentum of reverse movement as compared to that of the counterweights, rendering the operation of the ring frame more uniform and smooth.

The invention provided numerous advantages in the field of textiles and its application to spinning frames of old construction in respect to other systems now in use, involves: increase in production; almost total reduction of breakages due to winding; the possibility of producing also with the continuous frame the very soft torsions obtainable so far only with the self-acting mule; and general improvement of the qualities of the yarn produced.

Said system of thread guide is exclusively adapted for the transformation of existing old ring frames by means of convenient modifications, in such a manner as to modernize therewith the winding systems and to enhance their operation and output to that of spinning frames of very recent construction with the evident advantage of immediate modernization of the existing textile industries employing obsolete machinery.

Of course what has been hereinbefore described and illustrated in the accompanying drawings, may be modified in detail of embodiment, within the scope of the invention.

What I claim is:

1. In a ring spinning frame, a ring carrier plate, a drawing frame, a thread guide, a support for the thread guide, a supporting guide member for the thread guide support in which the thread guide support is vertically movable, means to connect the supporting guide member to the drawing frame, a tiltable separator mounted on the thread guide support for movement about a horizontal axis, a piston and cylinder unit, a flexible connection extending between said thread guide support and the piston rod of the piston and cylinder unit, and a cam member about which the flexible connection is trained whereby the movement of the ring carrier plate transmits variably the amplitude of movement from the piston rod of the piston and cylinder unit to the support for the thread guide to dampen said thread guide support.

2. A ring spinning frame according to claim 1 characterized in that said cam member is fitted on a shaft which also carries a pulley fixed thereto, said flexible connection comprising two ropes one of which is fixed at one end to said piston rod and at the other end is wound around said cam member and fixed thereto, the other rope being wound around said pulley and fixed thereto and connected to the thread guide support.

3. A ring spinning frame according to claim 1 characterized in that said cam member is provided with a portion with variable profile and a portion with constant profile.

4. A ring spinning frame according to claim 1 characterized by the fact that the frame includes a device to drive the piston and cylinder unit, such device comprising an oscillating lever pivoted in its central portion and linked at one end to the ring plate and at the other end to the cylinder.

5. A frame as claimed in claim 1 wherein a spring surrounds the piston rod with one end bearing against the piston and the opposite end against the cylinder.

6. A spinning frame according to claim 1 characterized in that the thread guide support movable in said supporting guide member is provided with longitudinal grooves containing balls interposed between said support and said guide member.

7. A spinning frame according to claim 1 characterized in that the separator is carried on a shaft, a tilting prism also carried by the shaft, and a fixed nose on the drawing frame cooperating with said tilting prism during the drawing 01f operation, to cause the separator to tilt from a horizontal position to a vertical position.

8. A spinning frame according to claim 1 characterized by the fact that another cam with variable profile, on which is wound a rope carrying a weight, is mounted on a shaft, the cam member also being mounted on the same shaft, with the weight serving to balance forces reacting on the shaft.

References Cited in the file of this patent UNITED STATES PATENTS 974,030 Culver et a1. Oct. 25, 1910 1,028,480 Morin June 4, 1912 FOREIGN PATENTS 5,029 Great Britain of 1880.