Textiles: spinning – twisting – and twining – Apparatus and processes – With stretching
Patent
1996-05-13
1998-06-02
Stryjewski, William
Textiles: spinning, twisting, and twining
Apparatus and processes
With stretching
28240, 28245, 57 60, 57 66, 57287, 57288, D01H 1304
Patent
active
057584834
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to apparatus for twisting travelling strands. As used herein the term "strand" extends to any fibre or filament or any elongate coherent assembly of fibres or filaments.
The insertion of twist into an assembly of staple textile fibres, such as a sliver or roving, is a well-known textile processing step which is used for example to impart strength to an assembly of fibres, as in yarn manufacture. It may also be used to provide a degree of control over a fibre assembly during operations prior to spinning, as for example in a drafting operation. The insertion of false twist as opposed to real twist is also well-known and is used in a variety of textile processes.
The applicant's International Patent Application No PCT/AU90/00349 (International Publication No WO 91/02835) discloses a method and apparatus for stretching the fibres in an assembly of staple fibres, such as a sliver or roving, by which false twist is imparted to the assembly to provide grip between the fibres to ensure that they are stretched rather than drafted. As used herein, the term "drafted" refers to elongation of a fibre assembly by longitudinal slippage between the fibres of the assembly. The stretching occurs between at least two arrays of pulleys which are mounted for rotation between two spaced pair of nip rollers with the arrays of pulleys extending along a direction of travel of the fibre assembly through the apparatus.
It has been found that apparatus of the kind illustrated in International Patent Application No PCT/AU90/00349 is prone to a number of problems, including excessive wear of bevel gears used in the pulley drive system, damage to bearings and gears which are exposed to a corrosive environment, difficulty in dynamically balancing the rotating pulley carriages and maintenance difficulties due to poor access of parts within the rotating assemblies. The present invention provides an alternative kind of twisting apparatus which enables these problems to be greatly alleviated.
Although the apparatus of the present invention has been developed to overcome the above stated problems associated with previous apparatus for stretching staple fibres, it will be evident from the ensuing description that the apparatus according to the invention can be used for twisting a travelling strand for any purpose and it is to be understood that the invention extends to an apparatus for twisting a travelling strand for any purpose.
DISCLOSURE OF THE INVENTION
According to the invention there is provided apparatus for twisting a travelling strand, comprising: about said rotational axis with each pulley in the array rotatably mounted on the structure for rotation about an individual axis of pulley rotation which is generally parallel to said rotational axis and moves around said rotation axis on rotation of the rotary structure; in which it will successively engage the pulleys of the array; path from the apparatus; and axis and also to rotate at least one of the pulleys of said array about its respective individual axis whereby to drive the strand forwardly to said exit path.
Preferably, the strand input guide means is effective to guide the travelling strand from an input path extending along said rotational axis into the path in which it will successively engage the pulleys of said array.
The strand input guide means may comprise an input guide pulley mounted on said rotary structure to engage the travelling strand at a location along said rotary axis and to guide the strand radially outwardly of that axis toward the first of the pulleys of said array to be engaged by the strand. The input guide pulley may be freely rotatable about an axis transverse to the rotational axis of the rotary structure.
Preferably, the strand exit guide means is effective to guide the travelling strand from the path in which it successively engages the pulleys of said array into an exit path extending along the rotational axis of the rotary structure. The strand exit guide means may comprise an exit guide pulley mounted on t
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Phillips David Graham
Thomas Keith Alan
Commonwealth Scientific & Industrial Research Organisation
Stryjewski William
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