Draft roller, spinning unit, spinning machine, and manufacuring method of spun yarn
AssigneeMurata Machinery, Ltd.
InventorsAkihiro MORITA, Sato GOYUDE
Life of this patent
Estimating the term…
Abstract
The front top roller (20) includes a fiber contacting portion (30) and a reduced-diameter portion (31). The fiber contacting portion (30) has a substantially uniform outer diameter. The reduced-diameter portion (31) is provided at both ends of the fiber contacting portion (30) in an axial direction, and is formed with an outer diameter smaller than an outer diameter of the fiber contacting portion (30). The fiber contacting portion (30) has a width (W1) in an axial direction of 18 mm and the outer diameter (D1) of 30 mm. An outer diameter (D2) of the reduced-diameter portion (31) is 25 mm.
Claims13
A draft roller suitable for drafting a fiber bundle, the draft roller comprising:
- a fiber contacting portion having a substantially uniform outer diameter, a width in an axial direction being 18 mm and the outer diameter being 30 mm, and
- a reduced-diameter portion provided at both ends of the fiber contacting portion in an axial direction, the reduced-diameter portion having an outer diameter of 25 mm.
A draft roller suitable for drafting a fiber bundle, the draft roller comprising:
- a fiber contacting portion having a substantially uniform outer diameter, and
- a reduced-diameter portion provided at both ends of the fiber contacting portion, the reduced-diameter portion having an outer diameter smaller than the outer diameter of the fiber contacting portion to form a step of at least 1.5 mm by an outer peripheral surface of the fiber contacting portion and an outer peripheral surface of the reduced-diameter portion after abrasion of the outer peripheral surface of the fiber contacting portion.
A spinning unit comprising:
- a draft device adapted to draft a fiber bundle, and includes a draft roller adapted to draft the fiber bundle by rotating, the draft roller including a fiber contacting portion having a substantially uniform diameter, a reduced-diameter portion having an outer diameter smaller than an outer diameter of the fiber contacting portion, and a step of 2.5 mm formed by an outer peripheral surface of the fiber contacting portion and an outer peripheral surface of the reduced-diameter portion;
- and
- a spinning section adapted to spin the fiber bundle drafted by the draft device at a spinning speed of at least 400 m/min.
A spun yarn manufacturing method for manufacturing a spun yarn by applying a twist to a fiber bundle drafted by a draft roller, the spun yarn manufacturing method comprising:
- using the draft roller including a fiber contacting portion having a substantially uniform outer diameter, and a reduced-diameter portion having an outer diameter smaller than an outer diameter of the fiber contacting portion and being provided at both ends of the fiber contacting portion in an axial direction;
- and
- performing spinning while gradually changing a step formed by an outer peripheral surface of the fiber contacting portion and an outer peripheral surface of the reduced-diameter portion from 2.5 mm to 1.5 mm.
Dependencies are inferred from the claim text.