CZ2008311A3 - Drafting mechanism - Google Patents

Abstract

The draw-off device (4) for the spinning machine (1) is formed by a plurality of roll pairs having driven lower rollers (15A, 15B, 15C) as well as freely rotatably mounted rollers, wherein the pulling device (4) has two working positions (14). Lower rollers (15A, 15B, 15C) positioned coaxially are placed in a free-pivoting position on the shaft (20). The central regions (22) of the shaft (20) are formed such that the lower rollers (15A, 15B, 15C) are easily fixed in the clamps (19) of the drawbar support (18) and are also readily removable therefrom.

Description

Stretch mechanism

Technical field

The present invention relates to a draw-through device for a spinning machine comprising a plurality of pairs of rollers having driven lower rollers as well as corresponding free-pivoting upper rollers, the draw-through apparatus having two workstations.

BACKGROUND OF THE INVENTION

DE 39 32 614 A1 discloses a draw-through device with two workstations for air spinning machines, which is formed with a plurality of roller pairs. The cylinder pairs have an individual motor-driven lower roller as well as free-standing upper rollers. It can be seen from DE 3932614 A1 that the lower rollers are located on the support of the draw-through device, but it is not explained in detail how they are supported on the support. However, directly supporting the lower rollers presents a particular challenge in terms of both the compatibility of a stable, reliable bearing and a maintenance-friendly bearing in the sense of an easily accessible and easily replaceable location of the lower rolls in order to reduce the manufacturing cost of the draw-through device.

SUMMARY OF THE INVENTION

It is an object of the present invention to further improve the draw-through device of this type so that it has a maintenance-friendly and economical arrangement of the lower rollers.

This object is achieved according to the invention by means of a draw-through device with the features mentioned in claim 1.

Further advantageous embodiments are the subject of the dependent claims.

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According to claim 1, it is proposed that the lower cylinders are aligned coaxially and spaced apart from one another on the shaft, and the shafts are formed in their central regions extending between the lower cylinders so that they can be easily adjusted and re-positioned in the corresponding clamps. remove them easily. The freely rotatable mounting of the lower rollers according to the invention on a shaft in pairs allows the use of standardized bearing shafts, as are usually used for the upper shafts of the draw-through device of annular spinning machines. Because of their relatively simple construction, the degree of automation in their manufacture and the associated high number of fabricated parts, these are considerably more cost-effective than the custom-made shafts for supporting the lower rollers of the draw-through device for spinning machines. In addition, due to its location on the carrier clamp, easier replacement of the lower rollers for maintenance or repair is achieved. Thus, the replacement of the lower straps and the lower roller will be simpler and more cost-effective compared to the lower roller used in conventional annular spinning machines, since it can be done without the need to shut down the entire side of the machine, as is necessary with annular spinning machines. with lower rollers along the machine.

Advantageously, the lower rollers may be connected to the drive shaft of a separate drive. The stand-alone drive allows independent control of both workstations of the draw-through device with different elongations when required by the original material fed for processing or a yarn of different fineness is to be produced.

In a preferred embodiment of the invention, the lower cylinders may have clutch extensions for connecting the drive shaft. Clutch attachments allow simplified separation of the lower cylinders from the drives to replace them. Due to the simplified removal of the shaft, the cost of replacing the straps of the central rolling rolls is also reduced in the draw-through device according to the invention by means of the easily positioned central rolling rolls. In addition, the formation of the lower cylinder bearing shafts allows them to be pre-assembled for use in a carrier of a complete lower cylinder unit, consisting of a pair of lower cylinders and a bearing shaft. Overall, assembly costs are reduced and maintenance work is easy and quick to do.

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The lower rollers themselves can in particular be mounted on a support. Alternatively, it may

Even for securing against the rotation of the actuators itself, mount them on the machine base or by means of a frame connecting the drives to one working place of the draw-through device.

According to an alternative embodiment, the lower rollers may have a belt wheel by means of which they are driven independently of each other.

Preferably, the carrier may have a clamping device corresponding to the central region of the shaft for clamping it. This serves to fasten the lower roll unit as well as to absorb the load transmitted from the upper rollers to the lower rollers during operation of the draw-through device when the upper rollers are pressed against the lower rollers by the load carrier.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in more detail below with reference to the embodiment shown in the drawings. The drawings show:

Giant. 1 is a simplified view of an air spinning machine;

Giant. 2 is a schematic top view of the draw-through device partially in section, showing only the lower rollers;

Giant. 3 is a schematic view of a lower cylinder unit, partially in section.

DETAILED DESCRIPTION OF THE INVENTION

The draw-through device according to the invention is explained in the following by means of an air spinning machine 1, but the draw-through device is also applicable to an annular spinning machine.

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The air-spinning machine 1 shown in FIG. 1 has a plurality of spinning stations 2 arranged next to one another. Each spinning station 2 comprises a fiber sliver source formed as a unwinding spool 3 from which the fiber sliver is fed to the drawing device 4 a pair of guide rollers 6, a yarn cleaner 7, a laying device 8 as well as a unwinding spool formed as a cross-wound spool 9. The control carriage 10 is movable along the spinning positions 2 on the rails 11, 12. At one end of the air spinning machine 1 a drive unit 13 is located.

Giant. 2 schematically shows a drawing device 4, partially in section, with two work stations 14.

The draw-through device 4 comprises a carrier 18 on which a plurality of roll pairs are located for each work station 14. The cylinder pairs consist of driven lower rollers 15A, 15B, 15C as well as corresponding, freely rotatable upper rollers. The lower rollers 15A, 15B, 15C are driven by a separate drive 16. The upper rollers are pressed against the corresponding lower rollers 15A, 15B, 15C by a load arm and are driven therefrom by friction.

To drive the lower rollers 15A, 1.5B, 15C, they are in communication with the actual drive 16 by means of clutch extensions 17. Alternatively, the lower rollers 15A, 15B, 15C may have belt wheels, by means of which they are driven independently of one another.

Fig. 3 is a schematic view of a lower cylinder unit, partially in section. The lower roll unit consists of a pair of spaced lower rollers 15A coaxially spaced and rotatably mounted on a shaft 20. The shaft 20 has a central region 22 having a diameter reduced relative to the diameter of the end regions 21 for receiving the lower rollers 15A. The central region 22 of the shaft 20 is formed in such a way that the lower cylinder unit is easily mounted in the clamp 19 of the carrier 18 of the draw-through device 4 and is easily removable therefrom. The clamp 19 is disposed coaxially with the longitudinal axis on the support shaft 18 of the bearing shaft 20 and forms a clamp 19 to form a clamp 19. φ · φ · * v «v« «« «v v v namont namont v namont namont namont v v v namont namont namont namont v namont namont namont namont namont namont namont The shaft 20 is clamped in the clamp 19 so that it is easy to fasten and also easy to remove from it.

The free rotation of the lower rollers 15A is achieved by means of a roller bearing, in particular a needle bearing, since these are characterized by a small diameter.

The connection to the drive itself takes place by means of clutch extensions 17, as shown in FIG. 2, or by means of bores formed on the lower rollers 15A, by means of which the lower rollers 15A are mounted on the drive shaft of the drive 16.

Claims (6)

A draw-through device (4) for a spinning machine (1) comprising a plurality of pairs of rollers having driven lower rollers (15A, 15B, 15C) as well as corresponding freely rotatable upper rollers, wherein the draw-off device (4) has two workstations (14), characterized in that the spaced apart lower rollers (15 A, 15B, 15C) are arranged in pairs freely rotatable on the shaft (20), the shafts (20) being in their between the lower rollers (15A, 15B, 15C) of the extending center region. (22) are designed so that they can be easily fastened in corresponding clamps (19) of the support (18) of the draw-through device (4) and are also easily removable again. Draw-through device (4) according to claim 1, characterized in that the lower rollers (15A, 15B, 15C) are connected to the working shaft of a separate drive (16). Draw-through device (4) according to claim 2, characterized in that the lower rollers (1.5A, 15B, 15C) have clutch extensions (1.7) for receiving the drive shaft. Draw-through device (4) according to one of claims 2 or 3, characterized in that the separate drive (16) of the lower rollers (15A, 15B, 1.5C) is mounted on the support (18). Draw-through device (4) according to claim 1, characterized in that the lower rollers (15A, 15B, 15C) have a belt wheel by means of which they are independently driven. Draw-through device (4) according to one of Claims 1 to 5, characterized in that the support (18) has clamping devices corresponding to the central region (22) of the shaft (20) for its holding.