Process and device for piecing with a spinning device operating

Details Process and device for piecing with a spinning device operating Process and device for piecing with a spinning device operating

1988-03-02

1990-01-16

Petrakes, John

Textiles: spinning, twisting, and twining

Apparatus and processes

Piecing up

57279, 57280, 57328, D01H 1500, D01H 1502, D01H 528

Patent

active

048934615

DESCRIPTION:

BRIEF SUMMARY
SUMMARY AND BACKGROUND OF THE INVENTION

The instant invention relates to a process for piecing with a spinning device operating with a pneumatic twisting unit, in which a yarn end is backfed from the output side through the twisting unit to a drawing equipment to be then inserted laterally into the pair of output rollers of the drawing equipment, from where it is drawn off through the twisting unit in form of a continuous yarn as the rove is incorporated, and to a device to carry out this process.
In a known process of this type the twisting unit is shifted laterally for piecing, so that its input side becomes accessible (DE-OSen 3,411,577 and 3,413894). A yarn end is then pulled from the bobbin and is introduced into the twisting unit from the output side. A suction pipe is moved to the input side of the twisting unit and pulls the yarn end off through the twisting unit. The twisting unit is then brought back into its spinning position and the yarn segment extending from the twisting unit to the suction pipe is inserted into the output roller pair of the drawing equipment. The spinning process can then be resumed. In this known piecing process it is an advantage that the twisting unit must be shifted laterally for the back-feeding of the yarn end to the drawing equipment. On the one hand, additional space is needed next to the twisting unit for this lateral shifting of said twisting unit which prevents the construction being compact. On the other hand, there is the danger that the twisting unit may not return exactly into its starting position as it is returned, and this would impair the, spinning process and the quality of the yarn.
Since the undisturbed spinning process is to be regarded as the normal state in a spinning device, and the piecing process as an extraordinary situation, terms such as "input side" or "input opening" or "output side" or "output opening" of the twisting unit always refer to this normal state. The "input side" or "input opening" of the twisting unit is thus the side or opening towards the drawing equipment since the yarn in the process of being drawn off reaches the twisting unit on that side in the normal spinning process and leaves the twisting unit on its side away from the drawing equipment.
The "rove", in the sense of the instant invention, is to be taken as being any sliver-like fiber material that can be drawn by means of a drawing equipment and can be fed to the twisting unit, whether or not it has little twist or not. Therefore not only fly roves come under this designation, but also card slivers etc.
It is the object of the instant invention to create a process and a device for piecing a spinning device with a pneumatically operated twisting unit, by means of which a shifting of the twisting unit to back-feed the yarn can be dispensed with, so that a spacesaving construction of the spinning device can be achieved and optimal adjustment of the twisting unit is always ensured for spinning.
This object is attained through the invention in a process of this type in that the yarn end is conveyed through the twisting unit located after the pair of output rollers of the drawing equipment to its input side, in that it is seized there and fed to a grasping device located alongside the drawing equipment, which then draws the yarn end past the output roller pair for later insertion into same. Due to the fact that the yarn emerging from the twisting unit at its input side is seized between the drawing equipment and the twisting unit and is conveyed to a grasping device located alongside the drawing equipment, it is not necessary to shift the twisting unit laterally and the twisting unit can thus always remain in its spinning position.
There must merely be enough space provided along the side of the drawing unit so that a grasping device can be installed which can be moved essentially parallel to the direction of movement of the fiber material and thus requires little space. Due to the fact that the twisting unit also does not change position with respect to the drawing equipment

REFERENCES:
patent: 4503662 (1985-03-01), Horiuchi et al.
patent: 4543776 (1985-10-01), Seiki et al.
patent: 4545193 (1985-10-01), Tanaka et al.
patent: 4550560 (1985-11-01), Tanaka et al.
patent: 4620413 (1986-11-01), Anahara et al.
patent: 4769981 (1988-09-01), Artzt et al.

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