Method of controlling the driving of a ring spinning frame
AssigneeHowa Machinery, Ltd.
InventorsKoichi Yamada, Hiroshi Enomoto, Osamu Yoshida
Life of this patent
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Abstract
In the high speed driving of a ring spinning frame provided with a plurality of ring-spinning twisting-winding units, to compensate for the possible loss of thickness of yarn produced, when the drive speed of the spindles reaches more than a predetermined rotation speed, such as 16,000 rpm in the case of spinning a cotton yarn of 40's, a total draft ratio of each drafting part of the ring spinning frame is regulated to maintain the expected yarn count according to a predetermined compensation program.
Claims3
In a method of driving a ring spinning frame provided with a plurality of spindles driven to produce full packaged cops thereby, while controlling a rotation speed thereof with a predetermined program wherein said rotation speed of said spindles is stepwisely increased from zero to a predetermined maximum value of said rotation speed via at least a predetermined intermediate value of said rotation speed, said spindles are then driven at said maximum rotation speed to create a main portion of said full packaged cop, and finally, said rotation speed is stepwisely reduced to zero via at least said intermediate rotation speed, for producing a particular yarn in a form of a full packaged cop, with a predetermined total draft,
- an improvement comprising,
- previously measuring a relationship between loss of thickness of said particular yarn and said rotation speed of spindles, when said rotation speed of said spindles is higher than a predetermined rotation speed,
- automatically regulating said total draft in a reverse condition to compensate said possible loss of thickness of said particular yarn each time said rotation speed of said spindles is changed in such a condition that said rotation speed of said spindles is higher than said predetermined rotation speed in accordance with said relationship between a loss of thickness of said particular yarn and said rotation speed of said spindles.
Dependencies are inferred from the claim text.