US3387339A - Sliver condenser for drawing frames - Google Patents

Description

June 11, 1968 c. s. BOFILL 3,387,339

SLIVER CONDENSER FOR DRAWING FRAMES Filed Sept. 14, 1964 INVENTOR. CARLQS SAM-E5 Bonn.

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ATTORNEY United States Patent 3,387,339 SLIVER C(lNDENfiER FOR DRAWING FRAMES Carlos Salles Bofill, Provenza 226,

Barcelona, Spain Filed Sept. 14, 1964, Ser. No. 396,214 2 Claims. (Cl. 119-150) This invention relates to drawing frames and the like and particularly to a novel structure for delivering sliver to the calender rolls.

In drawing frames normally used in spinning, the sliver, on leaving the drafting rolls passes through a trumpet placed on a plate and is carried to a pair of calender rolls after which the sliver is taken up in a revolving can in which it is laid out. For best operation of this step, it has been found advantageous to introduce the sliver in the calender rolls at substantially the very point of tan- -gency of the latter, which is the point of contact of these rolls. In actual practice this is diffioult since the trumpet must be placed so that its lower orifice is above the point of tangency of the calender rolls as otherwise, due to the thickness of the walls of this trumpet, it would be in contact with the calender rolls and would score them.

Thus, normally, there is a certain length of sliver free between the lower orifice of the trumpet and the rolls, and if the orifice is wide, the sliver opens out or expands in this area, with a subsequent reduction of the amount of sliver that can be contained in the take-up can. This is a pronounced disadvantage in modern high production spinning plants. On the other hand, if the trumpet orifice is narrow, there is a degree of friction applied to the sliver which tends to hold the sliver in the trumpet and causes the sliver to be pulled out by the calender rolls which are pulling it downward, thereby causing irregularity in the yarn ultimately spun.

Moreover, with this usual arrangement, the trumpet has changes in position due to the normal vibration of the machine which is also a disadvantage since it is desirable for the axis of the trumpet to be maintained at a tangential angle with respect to both calender rolls at the point of tangency of the rolls, and this requires periodic checking of the positioning of the trumpet.

The present invention is concerned with certain improvements in drawing frames, by which the previously mentioned disadvantages are avoided and which also provide other important advantages, since, without danger of scoring the rolls and without having to regulate the position of the trumpet, they allow carrying the sliver virtually to the precise point of tangency of the calender rolls without producing any change in the cross-section of the sliver, and this cross-section can be fixed by means of a strong compressive force exerted thereupon by the calender rolls.

The improvement may include a special trumpet element made of nylon or another material of similar characteristics of hardness, being principally a prismatic body made up of two concave cylindrical faces with a radius corresponding to that of the calender rolls, and converging at a common lower edge and which has a conical perforation, with two tapers, whose base opens out in the fiat face of the plane opposite the said edge, with a relatively large taper and having in the lower half a cone of relatively reduced taper whose vertex coincides with the center of the aforementioned edge, which is formed by the convergence of the cylindrical faces.

This trumpet rests freely directly upon the calender rolls and on their cylindrical faces so that the orifice of the trumpet in the shape of a cone is situated virtually at precisely the line of tangency of the calender rolls. The upper flat face of the trumpet remains positioned 3,387,339 Patented June 11, 1968 either below the opening in the covering plate which carries the sliver, but without touching the plate. Such may be positioned at the same level as the upper face of the carrying plate, resting or positioned with loosely in an opening in this plate of such size as to correspond in shape.

In this way, the trumpet has a certain amount of freedom of movement which allows the automatic centering of the exit orifice of the trumpet, eliminating the need for adjusting the usual trumpet above the carrying plate and eliminating any danger of scoring the rolls. At the same time, the sliver is delivered to the calender rolls at virtually the precise tangential point of the calender rolls. This means that in this way the sliver enters the calender rolls with the same reduced cross-section that it has on exiting from the trumpet orifice, without having any opportunity to open out or expand. This provides the important advantage that, if there is exerted on the calender rolls a reciprocal pressure sufiiciently large, the cross-section of the sliver becomes fixed permanently due to the pressure to which it is subjected, and thereby achieving a much greater capacity of the take-up can over the usual. The uniformity or consistency of the sliver is also increased, favoring its subsequent handling and avoiding slack twist in subsequent operations, all of which makes for greater regularity in the yarn subsequently obtained.

The construction designed to carry out the invention will be hereinafter described, together with other features thereof.

The invention will be more readily understood from a reading of the following specification and by reference to the accompanying drawing forming a part thereof, wherein an example of the invention is shown and Where- FIGURE 1 is a schematic longitudinal cross-sectional view, illustrating the sliver as it leaves the drafting elements of a drawing frame and the like, showing how it is carried to the point of tangency of the calender rolls in accordance with the present invention,

FIGURE 2 is an enlarged perspective view of a device constructed in accordance with the present invention, and

FIGURE 3 is a front elevation illustrating the rear section of such device, with the front section removed, to show the interior of the assembled device.

As FIGURE 1 illustrates, the sliver 10 on leaving the last pair of rolls 11 of the drafting means passes over a plate 12 which has an opening 13 under which the calcuder rolls 14 are located for delivering the sliver 10 to the can (not shown).

Usually, the opening 13 in the pate 12 is circular and the usual trumpet is mounted in it with its exit orifice positioned a given distance above the rolls 14. However, it is perferable that the opening 13 be made larger and of such a shape as to allow its positioning with certain looseness, and so that the upper face maye be at substantially the same level as the plate 12. The body 15 is essentially prismatic in shape, being constructed of nylon or other desirable material, and has lower cylindrical faces 16 with a radius corresponding to that of the calender rolls 14, and which converge almost tangentially forming a lower edge 17.

The body 15 has an internal recess in the general shape of a truncate cone as at 18, with a substantial taper, the base of which opens in the upper face of the body, and which has a lower second conical section 19 with a lesser taper and whose vertex coincides with the center of the lower edge 17, forming an orifice 20 of relatively small size.

Preferably, and to facilitate the movement of the sliver through the interior of the trumpet and to increase the effect of reduction of the cross-section of the sliver, the

upper conical perforation 18 is made with convex taper 21 and the lower conical perforation 19 with a concave taper 22, the two conical perforations being connected together in a smooth curve so that the inner surface of the trumpet progresses smoothly from the upper to the lower conical perforation and the lower perforation 19 is prolonged in a narrow cylindrical passage 23 terminating in the exit orifice 2%.

This body made in the way described includes a passageway having double conical portions whose upper-half portion 18 guides the sliver in the trumpet and reduces the section of the sliver while the lower-half portion 19, with its prolongation 23, acts as a second section reducing portion for the sliver.

The body 15 rests freely on its cylindrical faces 16 on the two calender rolls 14 so that its lower edge with the exit orifice 2t coincides almost exactly with the line of tangency of the said rolls 14, and its upper fiat face coincides with the opening of the funnel 18, at the same level as the upper-face of the carrying plate 12.

As can be seen in this arrangement, the sliver 10 is carrier to the very point of tangency of the rolls 14 eliminating that section of sliver which usually remains free between the exit orifice of the usual trumpet and the nip or pressure point (point of tangency) of the calender rolls. This eliminates the expansion of the sliver and also any possibility of distension but without any danger of scoring the surface of the rolls 14 due to the perfect adaptation of the contact surfaces of the body 15 and the roll surfaces.

The calender rolls 14 are preferably mounted on sup porting elements connected together and which are urged toward each other by tension created by appropriate means, such as springs (not shown), so that the said tension is compensated by the mutual reaction of both rolls, without being transmitted to supporting elements on the machine. The sliver thus receives strong compression which fixes the cross-section of the sliver as it exits from the device.

In addition to these results obtained by the functioning of the funnel according to the improvements described, the method of mounting this funnel offers certain advantages also, since by resting directly upon the calender rolls 14, without any rigid connnection to the carrying plate 12, it automatically centers itself so that its axis is maintained constantly tangential to the two calender rolls 14. A similar result may be obtained if the usual opening of the plate 12 is formed in the shape and dimensions of the opening of the truncated conical portion 18 and positioned so that its upper flat face is located below the level of the carrying plate 12 without contacting it.

In actual practice, and in order to facilitate the cleaning of the inside of the funnel without danger of damaging the exit orifice 26, particularly when the sliver is stuck in the trumpet, or breaks inside it, the body 15 of the trumpet is made preferably in two halves 15, 15 in a plane perpendicular to the lower edge 17, which is connected together by screws 24 which are housed in bores 25 in both halves, or :by other suitable means.

While a preferred embodiment of the invention has been described using specific terms, such description is for illustrative purposes only, and it is to be understood that changes and variations may be made without departing from the spirit or scope of the following claims.

What is claimed is:

1. For use in drawing frames and the like having a plate for the sliver beyond the exit of the sliver from the drafting elements, and calender rolls which deliver the sliver to a can, the improvement including, an element of essentially prismatic shape having, an upper flat face, lateral concave cylindrical faces below said upper face with a radius corresponding to the calender rolls converging at virtually a tangential angle forming a lower edge, a passageway extending from said upper face through said lower edge formed by a surface curvilinear shape with an upper convex taper blending smoothly with a lower concave tapering portion, and an exit orifice of small dimensions, said exit orifice including a prolongation of the lower portions in a narrow cylindrical portion, whereby the element rests freely on its cylindrical faces upon the two calender rolls so that the lower edge with exit orifice coincides with the line of tangency of the calender rolls.

2. The structure set forth in claim 1, wherein the element includes, two halves in a plane perpendicularly divided with respect to the lower edge, and means joining the halves together.

References Cited UNITED STATES PATENTS 146,816 1/1874 Frye 19-l50 146,881 l/l874 Dawson l9.25

549,956 11/1895 Canning 19-150 2,640,229 6/1953 Gwaltney l9l57 3,246,370 4/1966 West 19l50 FOREIGN PATENTS 801,254 12/1950 Germany.

593,310 10/1947 Great Britain.

609,753 10/ 1948 Great Britain.

MERVIN STEIN, Primary Examiner. D. NEWTON, Assistant Examiner.

Claims (1)

1. FOR USE IN DRAWING FRAMES AND THE LIKE HAVING A PLATE FOR THE SLIVER BEYOND THE EXIT OF THE SILVER FROM THE DRAFTING ELEMENTS, AND CALENDER ROLLS WHICH DELIVER THE SILVER TO A CAN, THE IMPROVEMENT INCLUDING, AN ELEMENT OF ESSENTIALLY PRISMATIC SHAPE HAVING, AN UPPER FLAT FACE, LATERAL CONCAVE CYLINDRICAL FACES BELOW SAID UPPER FACE WITH A RADIUS CORRESPONDING TO THE CALENDER ROLLS CONVERGING AT VIRTUALLY A TANGENTIAL ANGLE FORMING A LOWER EDGE, A PASSAGEWAY EXTENDING FROM SAID UPPER FACE THROUGH SAID LOWER EDGE FORMED BY A SURFACE CURVILINEAR SHAPE WITH AN UPPER CONVEX TAPER BLENDING SMOOTHLY WITH A LOWER CONCAVE TAPERING PORTION, AND AN EXIT ORIFICE OF SMALL DIMENSIONS, SAID EXIT ORIFICE INCLUDING A PROLONGATION OF THE LOWER PORTIONS IN A NARROW CYLINDRICAL PORTION, WHEREBY THE ELEMENT RESTS FREELY ON ITS CYLINDRICAL FACES UPON THE TWO CALENDER ROLLS SO THAT THE LOWER EDGE WITH EXIT ORIFICE COINCIDES WITH THE LINE OF TANGENCY OF THE CALENDER ROLLS.

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