US2255821A - Double tape drawing frame for spinning and similar machines - Google Patents

Description

Sept. 16, 1941. 1.. SCHLIPP ETAL DOUBLE TAPE DRAWING FRAME FOR SPINNING AND SIMILAR MACHINES Filed Jan. 20, 1940 hi0. Z 2/ Patented Sept. 16, 1941 DOUBLE TAPE DRAWING FRAME FOR SPIN- NING AND SIMILAR MACHINES Ludwig Schlipp, Kassel, and Max Boettle, Kass'el- Bettenhausen, Germany Application January 20, 1940, Serial No. 314,748 In Germany January 24, 1939 Claims.

This invention relates to a double tape drawing frame for spinning and similar machines.

In double tape drawing frames the upper and lower tapes are usually passed separately each over a stationary bar at the forward turning point of the tapes in front of the front roller. In particular, one tape guide system has been used in practice in which the two bars are interconnected to form an equally sided fork. The

cross section of the two sides is so chosen that the two tapes are passed over a narrow edge rather than over a larger surface. The operation of this double tape drawing frame is determined by the actual distance between the two tapes.

This distance in turn is regulated by the spacing between the two legs of the fork. The distance between the two tapes which must be adapted to the properties of the fibres to be spun can only be regulated by the provision of various forks having larger and smaller distances between their legs. It is a feature of this type of tape guide, however, by two fixed bars, that the tapes are bent out upwardly and downwardly between this turning point and the drive above the cylinders in the middle of the drawing frame. Therefore, the fibres are mainly guided at the forward turning point. So far, this defect could only be remedied by passing the inoperative or idle sides of the tapes over tightening bars or tension rollers.

It is an object of the present invention to prostructural forms, as illustrated by the accompanying drawing in which: v

Fig. 1 is a section of a tape guide system in a cage, having the invention applied thereto.

Fig. 2 is an axial section through the guide or loading roller 1 and bar 4 of Fig. 1.

Referring now to the drawing in greater detail, it will be seen that the lower tape 2 in the cage I is passed at its rear turning point over a roller ll, operating in a relatively elevated bight of said tape, and at its front turning point 3 over a flat bar I, in a forward lower bight of said tape, where the roving leaves said tape. Bar 4 is ported in suitable recesses 5 of the cage I. The upper tape 6 passes over a roller l2 at its rear turning point and at its forward turning point passes around a loose loading roller 1 which is surrounded and supported by the tape 6. Roller I2 operates in a bight of upper tape 6 and is p0-' sitioned above roller Ii. Loading roller 1 is positioned over bar 4 in a bight of upper tape 6 and is freely movable between the walls of cage l. Roller l presses upper tape 6 towards lower tape 2 at the point where the roving leaves said tapes. As shown in Fig. 2, the central portion of roller 1 is recessed at 8 for exerting a resilient pressure upon the roving through the tape. The lateral flanges 9 of the loading roller I serve as race rings which are engaged'by the tape 6. A small retaining member It may be provided on each of the two walls of the cage I for preventing the loading roller I from climbing upwards and moving towards roller i2.

It will thus be seen that the upper and lower tapes 6 and 2 are guided separately, the lower tape being guided over the plate-shaped bar 4 while the upper tape 6 is not guided in a rigidly defined position by a bar but acted upon by the freely movable loading roller 1 which has a 'predetermined diameter and weight. This roller 1 is merely placed within the uppertape 6'and, due to the inclined position of the drawing frame and under action of its own gravityten'ds. to tighten the tape 6. Since the upper tape 6"is continuously subjected to this tension, it is caused to form a straight tangential line of connection between the nipping point between rollers ii and I2 and the return point at the loading roller I. Hence, the desired straight line guide for the upper tape 6 is achieved. The upper tape is made of such length as to place the loading roller 1 over the plate shaped lower bar 4. Since this bar has a certain width lengthwise of the drawing frame, the loading roller will always be positioned over this bar and bear towards the upper surface thereof, even in case of some elongation of the upper tape. The lower tape 2 may be held under tension by any conventional means, if required. In this manner, the fibres delivered between the two tapes are guided in the manner required for the spinning operation.

The central recess 8 in the loading roller I is so dimensioned as regards its width to correspond to the to and fro movement of the roving caused by the adjustment or changing of the feed lattice. Owing to this recess, therefore, the upper tape 6 is not rigidly but resiliently pressed formed with rounded forward edges and is supon, throughout the width of recess 8, by the loading roller 1. The 6 engages merely the two lateral fianges '9 of the roller I between which the recess 8 is defined, while the tape 6 runs freely above the central portion of the bar 7 a resilient pressure exerted by our novel drawing frame the same is rendered suitable for the spin-1 n'in'g of roving of a wide range of different thicknesses and material.

ing roller 1 and the resilient pressure exerted I The freely running loadthereby enables the drawing frame to adapt itself automatically as required by the properties of the material of be spun. 1 a

The operation of our novel double tape drawing frame is also considerably facilitated. The upper tape G-may be removed from the drawing frame independently ofthe lower tape 2 to carry out the cleaning work from time to time. The lower tape 2 then remains in its normal operative position, held by the bard.

Owing to the fact that the loading roller 1 is entirely covered by the upper tape 6 and has -no lateral guide pins, no fibre fly can be deposited. Also, compared to the conventional guide system comprising a fixed upper bar, less force is required to take the upper tape along.

The method and apparatus of the present invention have been described in detail with ref-,

erence to specific embodiments. It is to be un- (ierstood, however, that the invention is not limited by such specific reference but is broader in scope and capable of other embodiments than guiding the lower tape at 'the'point where the roving leaves the tapes, and a freely running loading roller surrounded by the upper tape and positioned over said bar, said roller being freely movable between the walls of the cage and adapted to tension the upper tape by its own weight and to press the same towards the lower tape, said loading roller pressing said tapes yieldingly together against said bar at the point where the roving leaves said tapes.

3. A double tape drawing frame comprising a cage, an endless lower tape, a roller operating in a relatively elevated bight of said tape, a guide bad in a forward lower bight of said tape where the roving leaves said tape, said guide bar having a substantially flat upper surface,

those specifically described and illustrated in the drawing.

We claim:

1. A double tape drawing frame comprising a" cage, upper and lower tapes, a bar for guiding the lower tape at the point where the roving leaves the tapes, and a freely running loading roller surrounded by the upper tape and posi-" tioned over said bar, said roller being freely movable between the walls of the cage and adapted to tension the, upper tape by its own weight and to press the same towards the lower tape,

an endless upper tape, a roller operating in a bight of said upper tape above said roller of said lower tape, and a loading roller mounted freely over said bar in a bight of said upper tape, said loading roller being freely movable between the walls of the cage and adapted to tension the upper tape by its own weight and to press the same towards the lower tape 'at the point where the roving leaves said tapes..

4. A double, tape drawing frame comprising a cage, inclined upper and lower tapes, a bar for guiding the lower tape at the point where the roving leaves the tapes, and a freely running loading roller positioned over said bar and surrounded by the upper tape, said roller being freely movable between the walls of the cage and adapted to tension the upper tape by its own weight and to press the upper tape toward the lower tape at the point where the roving leaves said tapes, the central portion of said freely running loading roller being recessed to form lateral race rings engaging the inner surface of said, upper tape.

5. A double tape drawing frame comprising inclined upper and lower tapes, a bar for guiding the lower tape at the point where the roving said loading roller pressing said tapes yieldingly together against said bar at thepoint where the roving leaves said tapes.

2. A double tape drawing frame comprising a cage, inclined upper and lower tapes, a bar for leaves the tapes, said bar having a substantially fiat upper. surface, and a freely running loading roller within the lower bight of said upper tape' and positioned over said bar, said roller being adapted to tension said upper tape by its own weight and yieldingly to press said tapes together at the point where the roving leaves said tapes..

LU'DWIG SCHIJPP. MAXBOE'I'I'LE.

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