US2239863A - Draw frame - Google Patents

Description

April 29, 1941. L PP v 2,239,863

DRAW FRAME Filed July 5, 1938 v 'w ITNESS NTOR ATTORNEYS Patented Apr. 29, 1941 DRAW FRAME Ludwig Schlipp, Kassel, Germany, assignor to Spinnfaser Aktiengesellschaft, Kassel-Bettenhausen, Germany, a corporation of Germany Application July 5, 1938, Serial No. 217,383

In Germany October 22, 1937 8 Claims.

This invention relates to drawing frames and has particular reference to leather belt drawing frames for doubling, drawing and spinning slivers.

Leather belt drawing frames according to the principle of Casablanca generally comprise, apart from a pair of feed rollers and a pair of drawing rollers, a pair of leather belts which are driven by two rollers positioned at the entrance of the sliver and guided, in the moving direction of the sliver, around two guiding rods. As is well known, very favorable conditions are thus created for drawing the silver in the drawing frame between the nipping points formed by the leather tape rollers on the one hand and the two following drawing rollers on the other hand.

It is already known that the distance apart of the two aforementioned nipping points formed by the nipping roller pair on the one hand and the drawing roller pair on the other hand determines the maximum length of fibre that can be spun in the drawing work. Hitherto such drawing works have been used with good success for spinning cotton, where a maximum length of staple of 40 mm. occurs so that the fibre material is guided in a very favorable manner between the running tapes.

Now, new problems have arisen in the spinning process with a view to the working of the new cellulose wool. Cellulose wool can be cut to staples of large or small length as desired and, of course, in many instances it is desired to spin relatively long artificial fibres and to mix such fibres with cotton which naturally has a limited length. It will be understood that the drawing frames set to a short distance apart of the nipping points as heretofore used cannot be employed for spinning longer fibres of cellulose wool, cut for example to a length of staple of 50, 60, 80 mm. and the like. In this case spinning machines have to be used having a distance apart between the nipping lines corresponding to the greater fibre length. Due to the larger distance between the nipping lines in turn a larger length of tape is required. Thus, the adhesion between the two cooperating sides of the two tapes is reduced, the pulled side of the lower tape no longer runs in an accurately straight direction or even hangs down visibly and thus the guidance becomes insufficient.

It is the object of my invention to remove these difliculties and to provide a better guidance and adhesion for the operative tape side in the frame or cage of greater length required for great length of staple.

Another object of the invention i to render it possible to spin fibres of quite different length of staple and to double rovings made of fibres of quite different length of staple, i. e. working each length of material separately or mixed material comprising fibres of dlfierent length.

With these and further objects in view which will hereinafter appear I provide a member in the frame or cage of the drawing frame which exerts pressure upon the operative band sides,

for example, deflects them from the straight direction, in order to increase the pressure between the same. This member is adjustable according to the special working conditions, that is to say, as regards the amount of pressure and as regards the point in the drawing frame where the pressure has to be exerted.

The device may take the form of a simple rod or of a simple rod-shaped roller which, for instance, is pressed from underneath against the lower operative band side and urges the two operative belt sides upwards from the straight direction to form a slight bending, but may obviously be pressed from above with the same result. The rod or roller may be mounted on the frame or cage or on the two cage plates respectively.

Advantageously spaced communicating recesses or apertures of variable depth are provided in the cage plates so as to receive the ends of the rod or roller member whereby rod or roller can be mounted higher or lower or displaced forwardly or rearwardly for changing the amount and point of attack of the deflecting pressure.

The invention will be better understood by reference to the following detailed description in connection with the accompanying drawing showing by way of example and diagrammatically one embodiment of the invention.

Referring to the drawing, the leather belt drawing frame comprising a supporting cage or frame I is arranged between the feed rollers 2, 3 and the drawing rollers 4, 5. The two leather belts 6 and l are driven by the middle rollers comprising the driving roller 8 and the top roller 9, in such a manner that the two operating sides 6' and I of the leather belts run in the direction of the yarn or fibre and are guided, at the end of the cage, around the two guide rods Ill and I I. Arranged in the cage between the middle rollers B, 9 and the guide rods III, II is the adjustable auxiliary device or deflecting member which is shown in the form of a round rod or roller device l2, the two preferably square shaped end portions of which may be selectively engaged in any of the spaced recesses H of variable depth in the two cage plates H in such a manner that the round rod l2 exerts more or less pressure in an upward direction at a suitable point of the operating sides of the leather belts and thus deflects the operating side of the lower leather belt more or less from a straight direction.

As is made clear by the drawing, the rod or roller device i2 is, to all intents and purposes, in fixed position relative to the belt with which it is in contact. The rod or roller device is set, or trunnioned, in the bottom of a slot, so that the pull of gravity, and also the pressure exerted by the belts, prevents it from rising, no matter what may be the tension on the operative band sides 6' l of the belts 6, l and, of course, no change of pressure exerted by the belts could ever push it downwardly. If the relative positions of the rod, or roller device, and the belts were reversed, for instance, if the former were arranged between the return points of belt i, and therefore pressed downwardly upon the operative band sides of the belts, mechanically equivalent means for holding the roller in fixed position would be openings in the side plates which are like the slots as, but reversed, in connection with which the function performed by gravity in the lower position would be performed by pins, plugs or other devices preventing downward movement of the rod or roller device.

By means of drawing frames which are thus modified it is possible to spin the new long fibres of cellulose wool of a length of 50, 60 or 810 mm. length in a satisfactory and faultless manner.

My invention ofi'ers still further advantages as follows: Where long fibres of cellulose wool have to be spun to a thread together with very much shorter fibres, for example cotton fibres, I have found that it is not at all sufilclent to enlarge the leather belts and the nipping point distance accordingly. The fibres, especially the short fibres, are insufficiently guided even in the elongated cage and leather belts and, therefore, only a cut yarn results. On the other hand, according to my invention it is possible to spin even such mixed fibres comprising long and very short fibres to a good yarn, since the said auxiliary device permits increase of the pressure and improvement of the guidance. Moreover, my improved drawing frame having a much larger distance between the pair of middle rollers and the pair of drawing rollers may be used also for spinning yarns the longest fibres of which are considerably shorter than the nipping line distance, because by means of my adjustable tensioning or deflecting member, pressure may be exerted to the operating leather belt portions at a suitable point to increase the adhesion at the respective point for forming an additional or auxiliary nipping point which renders it possible to spin also short fibres alone, corresponding to the reduced distance between the drawing rollers and the said auxiliary nipping point. It will be understood that while the said advantage is gained by the said auxiliary nipping point, the same will not positively retain or nip the fibres as, for instance, the middle cylinders or the drawing rollers. This offers the additional advantage that longer fibres that mayoccur in the material by chance will not break at this auxiliary nipping line.

It will thus be understood that my improved drawing frame offers the advantage that short fibres alone, such as fibres having the length of the usual cotton, as well as long fibres alone, such as cellulose wool having a length of staple of 50, 60, 80 mms. and the like, as well as mixed or blend yarn containing short and long fibres at the same time may be spun with the aid of this drawing frame. Moreover. my improved drawing frame is also suitable for doubling two different rovings, i. e. a roving consisting of short fibres and a roving consistingof long fibres. My drawing frame due to its special construction affords an equally good guidance for both kinds of fibre so. that a uniform thread is produced.

It will thus be noted that my novel drawing frame renders it possible to spin a faultless yarn from fibres of quite different length of staple mixed or separately worked or from two rovings of difierent length of staple by doubling said rovings, without any adjustment of rollers, only by action of the said adjustable auxiliary organ or deflecting member.

My invention will permit in future to admix with cotton, cellulose wool of much greater length of staple, irrespective of the length of staple of the cotton material, whereby the strength of such mixed yarns can be considerably increased.

In a similar manner by means of my novel drawing frame, rovings of quite different characteristics or origin may be doubled, as for instance, cottonand much longer cellulose wool, or flax and cotton or flax and cellulose wool and faultness yarns and new effects may thus be produced.

While I have herein shown and described certain preferred embodiments of my invention, I wish it to be understood that I do not confine myself to all the precise details herein set forth by way of illustration, as modification and variation may be made without departing from the spirit of the invention or exceeding the scope of the appended claims.

I claim:

1. In a textile machine, a drawing frame comprising a pair of feed rollers, a pair of drawing rollers, a pair of endless belts intermediate said rollers, means for driving and guiding said belts at their return points, plates on both sides of said belts for supporting said driving and guiding means, a rod-shaped member adapted to support the upper side of the lower belt at a point intermediate said return points, and recesses in said plates for adjustably mounting said rod-shaped support member.

2. In a. textile machine, a drawing frame comprising a pair of feed rollers, a pair of drawing rollers, a pair of endless belts intermediate said rollers, means for driving and guiding said belts at their return points, plates on both sides of said belts for supporting said driving and guiding means, a rod-shaped member adapted to support the upper side of the lower belt at a point intermediate said return points, and spaced communicating recesses of difierent depth in each of said plates adapted to selectively receive the ends of said support member.

3. In a textile machine, a drawing frame comprising a pair of feed rollers, a pair of drawing rollers, a pair of endless belts intermediate said rollers, retiu-n members of constant spacing for said belts, plates at both sides of said belts for supporting said return members, a rod-shaped member adapted to support the upper side of the lower belt intermediate said return members, and spaced communicating recesses of difierent depth in each of said plates adapted to selectively receive the ends of said support member.

4. In a textile machine a drawing frame comprising a pair of feed rollers, a pair of drawing rollers, a pair of endless belts intermediate said rollers, means for driving and guiding said belts at their return points, and a vertically and horizontally adjustable member adapted to increase the pressure between said belts at a point intermediate said return points.

In a textile machine, a drawing frame comprising a pair of feed rollers, a pair of drawing rollers, a pair of endless belts intermediate said rollers, means for driving said belts, means for uiding each of said belts at one of its return points, a rod-shaped member adapted and arranged to exert a degree of pressure against the operative band sides of such belts along a line intermediate their respective return points so as to create an auxiliary nipping line between said feed rollers and drawing rollers, and a plurality of means each effective to maintain said rod-shaped member in fixed position relative to the belt with which it isin contact, each of such means being arranged and adapted to maintain such rod-shaped member in a position different from that in which it can be maintained by any of the other means.

6. In a textile machine, a drawing frame comprising a pair of feed rollers,a pair of drawing rollers, a pair of endless belts intermediate said rollers, means for driving said belts, means for guiding each of said belts at one of its return points, a rod-shaped member adapted and arranged to exert a degree of pressure against the operative band sides of such belts along a line intermediate their respective return points so as to create an auxiliary nipping line between said feed rollers and drawing rollers, and a plurality of means each effective to maintain said rod-shaped member in fixed position relative to the belt with which it is in contact, and arranged in different positions lengthwise of an operative band side and thus effective to maintain such rod-shaped member in different positions lengthwise of such band side, and making possible a change of position of the auxiliary nipping line.

'7. In a textile machine; a drawing frame comprising a. pair of feed rollers, a pair of drawing rollers, a pair of endless belts intermediate said rollers, means for driving said beltsymeans for guiding each of said belts at one of its return points, a rod-shaped member adapted and arranged to exert a degree of pressure against the operative band sides of such belts along a line intermediate their respective return points so as to create an auxiliary nipping line between said feed rollers and drawing rollers, and a plurality of means each adapted to hold said rod-shaped member in fixed position relative to the band side with which it is in contact, each such means being arranged and adapted to hold such rodshaped member in a position at a distance different from that in which it can be held by any of the other means, thus making possible variation of pressure between the rod-shaped member and such band side.

8. In a textile machine, a drawing frame comprising a pair of feed rollers, a pair of drawing rollers, a pair of endless belts intermediate said rollers, means for driving said belts, means for guiding each of said belts at one of its return points, a rod-shaped member adapted and arranged to exert a degree of pressure against the operative band sides of such belts along a line intermediate their respective return points so as to create an auxiliary nipping line between said feed rollers and drawing rollers, and plates, one on each side of said belts, each such plate being provided with a plurality of openings, each such opening being adapted to support, by means of a corresponding and oppositely disposed opening, the rod-shaped member in fixed position i relative to the belt with which it is in contact,

each corresponding pair of openings being arranged and adapted to hold suchrod-shaped member in a position different from that in which it can be held by any of the other sets.

LUDWIG SCHLIPP.

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