Textiles: fiber preparation – Working – Combing
Patent
1995-01-04
1996-03-05
Calvert, John J.
Textiles: fiber preparation
Working
Combing
19215, 74 96, 74106, D01G 1916
Patent
active
054956439
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a lap nipping mechanism in a comber which produces a thin sheet composed of fibers, so-called "fleece", by removing short fibers from a group of fibers, so-called "lap", in the manufacturing process of cotton yarn. In particular, the present invention relates to control of the rocking operation of a nipper frame in the lap nipping mechanism, the nipper frame having a cushion plate for use in nipping a lap.
2. Description of the Related Art
The average length of cotton fiber depends on its kind or its place of origin. Additionally, even in the same kind of cotton, its average fiber length is not constant and often varies. To produce high-grade cotton yarn with superior tenacity and appearance, it is necessary to remove short cotton fibers (including foreign matter such as nep). Use of a comber is an effective way to attain this objective.
Generally, a comber comprises a combing cylinder, a top comb, a pair of detaching rollers, and a nipper apparatus. The nipper apparatus rocks back and forth while nipping sheet-like fibers, so-called "lap", supplied thereto. The combing cylinder has a series of needles (i.e., cylinder needles) embedded on its peripheral surface (i.e., cylinder half lap). As the nipper apparatus moves backward (away from the detaching rollers), the needles comb the forward end of the lap. This action is called "combing". This combing action removes short fibers from the lap, producing a thin sheet-like fiber product, so-called "fleece".
The fleece is transferred forward as the nipper apparatus moves forward (towards the detaching rollers). As the newly combed fleece moves forward, the detaching rollers rotate in reverse and cause a preceding fleece, previously combed, to move rearward. As a result, the rear end of the preceding fleece is overlapped with the front end of a newly combed fleece (i.e., succeeding fleece). Then, the detaching rollers rotate in the forward direction of rotation, to pull out forward the pieced together fleeces. This action is called "piecing". During piecing process, the top comb combs the rear end of the succeeding fleece. In the combing process, these operations are repeated to effectively remove the short cotton fibers from the lap.
In general, the nipper apparatus comprises a nipper frame, a cushion plate fixed on the nipper frame at its front end, and a nipper knife to nip the lap in cooperation with the cushion plate. The nipper knife nips the lap at the tip of the cushion plate. The nipper frame can rock between a backmost position where the tip of the cushion plate is proximate to the cylinder needles and a foremost position where the tip is proximate to the detaching rollers.
Methods of rocking the nipper frame in a comber are roughly classified into the following three types according to a path drawn by the tip of the cushion plate.
(Type 1): A nipper frame is rockably supported by a rocking mechanism located above it. The tip of the cushion plate moves along a downward projecting arc, which is part of a circle adjacent to a circle drawn by the tips of cylinder needles when the combing cylinder runs. The circle drawn by the tips of the cylinder needles is hereinafter referred to as "cylinder circle".
(Type 2): A nipper frame is driven by a nipper shaft located below the frame, and is supported in a rockable manner by a four-node link mechanism with the nipper shaft as a stationary point in the link. As the nipper frame rocks, the tip of the cushion plate moves along an upward projecting arc, which is part of a circle encompassing the cylinder circle.
(Type 3): A nipper frame is designed so that the tip of the cushion plate moves along a substantially straight horizontal line, which is a path tangent to the cylinder circle.
In a type 1 apparatus, when the cushion plate moves, a section in which its tip approaches the cylinder circle is short. This results in insufficient combing. In a type 2 apparatus, the section in which the tip of the cushion plate approaches the cy
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Calvert John J.
Kabushiki Kaisha Hara Shokki Seisakusho
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