CA1040021A

CA1040021A - Vacuum system for open end spinning machine

Info

Publication number: CA1040021A
Application number: CA252,552A
Authority: CA
Inventors: Richard A. Schewe
Original assignee: Barber Colman Co
Current assignee: Barber Colman Co
Priority date: 1975-05-16
Filing date: 1976-05-14
Publication date: 1978-10-10
Also published as: CH596336A5; GB1492508A; FR2311115A1; JPS521143A; DE2621480A1; BR7603096A; IT1074461B; IN155346B

Abstract

ABSTRACT OF THE DISCLOSURE

A single vacuum source provides suction for both the spinning and cleaning operations in an open end spinning machine.

Description

4( 1~2~
BACKGROU~D OF THE I~7E~TION
In an open end spinning machine fibers are spun into threads in a rotor or turbine rotating at speeds up to 100,000 r.p.m.
in a spinning chamber. Fibers, usually in the form of sliver, are fed to an opening roll. After the fibers are opened, they are drawn by vacuum into the rotor, where they are flung against the inner side of a reentrant cavity by centrifugal force. The rapid rotation of the rotor spins the fiber into yarn as it is withdrawn from the cavity at the axis of the rotor. Foreign material is separated from the fibers by the opening roll and falls through a grate into a cleaning chamber, from which it is removed by a vacuum.
The vacuum employed in the cleaning operation must be at a lower suction pressure than that used for drawing fiber into the rotor in order to permit fiber to be drawn into the rotor and to prevent fiber from being drawn into the cleaning chamber.
In the past separate vacuum sources have been employed Por these operations. This necessitated a duplication of components, such as fans, duct~ and the like. A poor utilization of space and materials resulted. A single vacuum source was not used because o the difference in suction pressure required.
SUMMARY OF THE INVE~TIO~
A single vacuum source is employed to supply suct~ion for both tha spinning and cleaning operations. Proper suction is provided for each operation through the use of restrictions. ~ach spinning station i9 supplied with suction from a vacuum source common to all of them. The suction is also employed to remove the xing of fibers left in the spinning rotor when spinning ceases.

BRIEF DESCRIPTION OF THE DRAWINGS
.
Fig. 1 is a schematic view partially in s~ction showing ~0~1 a vacuum source and its relationship in accord with this invention to an open end spinning station.
Fig. 2 is a schematic view of a vacuum source common to a plurality of spinning stations.
DE _RIPTION OF THæ PREFERRED EMBODI~ENT
As -~hown in Fig. 1, a spinning station 10 is connected to a vacuum source, here shown as a partial vacuum compartment 11.
In Fig. 2 a plurali~y o~ spinning stations 10 are connected to a com~on compartment or duct 11, which is exhausted to atmosphere through a vacuum producing means 121 such as a blower, and a filter , 13.
The spinning station 10 comprises a feed roll 14 rotatable at a relatively low speed clockwise to deliver textile fiber lS, usually in the form of sliver or roving, to an opening roll 16, revolving clockwise at a greater speed than the feed roll.
The opening roll has on its periphery claw~ 17, which tear apart or open the mass o ibers 15 delivered by the feed roll and carry the lndividual fibers with them as the opening roll revolves to align the fibers in the direction of rotation. The opening roll is closely surrounded by an enclosure 18. The fiber i9 carried around on the opening roll until it is separated from the claws 17 and drawn through a passage 19 into a reentrant cavity 20 o~ a spinning rotor 21 in a spinning chamber 22 by a partial vacuum maintained in the chamber by a suction through a vacuum port 23.
The rotor revolves at an extremely high speed so that the fibers drawn into the,cavity are flung by centrifugal force against the reentrant sides of the cavity, ~here they are retained in the form of a ring by said force. Some of the fibers in the ring become entrained with an end of a spun yarn 24, lying in ~he reentrant 4~Zl cavity and being withdrawn from the center of the cavity through a delivery tube 25. AS the yarn is wi~hdrawn, the entrained fibers are twisted by the rapid turning of the rotor to spin new yarn.
The mass of fibers 15 delivered to the opening roll 16 contains foreign material ~not shown) such as leaves, twigs and the like which fall to the bottom o~ the enclosure 18 and through an opening 26, which could be a grate, into a cleaning chamber 27.
There it is caught between solid paddles such as 28, 29 of paddle wheel 30, which revolves relatively slowly counter-clockwise. When it has rota~ed so that paddles 28, 29 occupy the positions 28', 29', the foreign material is removed through a vacuum port 31 by suction.
The port 23 is connected to the compartment 11 by a tube 33J in which may be a restriction such as a fixed orifice 34, or an adjustable valve 35, or both to control the vacuum pressure in spinning chamber 22. The port 31 is similarly connected to com-partment 11 by a tube 36, in which may be a restriction such as a fixed orifice 37, or an adjustable valve 38, or both to reduce the vacuum pressure in cleaning chamber 27.
When the rotor ceases revolving, the centrifugal force retaining the ring of fibers in the reentrant cavity is absent, permitting the ring of fibers to be removed by suction through port 23 and tube 33 into the vacuum source 11. The rings of fiber and foreign material are separated from the air being exhausted from the duct 11 by filter 13.
The cross-section of compartment or duct 11 must be sufficiently large to maintain a substantially uniform partial vacuum throughout the compartment or duct.
The embodiment shown and described herein is for purpose of illustration only. Those skilled in the art will recognize 3,~4()~2~
many possible substitutions and modifications that may be made withou~ changing th~ concept of the invention, which is de~ined solely by the claims.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. In a spinning machine a spinning station having an opening roll, an enclosure for said roll, a spinning chamber, a passage between the enclosure and said spinning chamber for opened fibers, a first vacuum port in the spinning chamber, a cleaning chamber, an opening between the enclosure and said cleaning chamber allowing foreign material to pass therethrough, a second vacuum port in the cleaning chamber, wherein the improvement comprises a single vacuum source connected through said first and second vacuum ports to said chambers, said source providing sufficient vacuum to draw the opened fibers through said passage and to remove the foreign material from said cleaning chamber.

2. A spinning station according to claim 1 additionally comprising a restriction between said second port and the vacuum source to reduce the vacuum pressure in said cleaning chamber.

3. A spinning station according to claim 2 wherein the restric-tion reduces the vacuum pressure sufficently to prevent fibers being drawn from said enclosure into said cleaning chamber.

4. A spinning machine according to claim 2 wherein the restric-tion is adjustable.

5. A spinning station according to claim 1 additionally comprising a restriction between said first port and the vacuum source to control the vacuum pressure in said spinning chamber.

6. A spinning station according to claim 5 wherein the restriction is adjustable.

7. A spinning station according to claim 1 wherein the vacuum source comprises a compartment connected through said ports to each of said chambers.

8. In a spinning machine having a plurality of spinning stations according to claim 7 said compartment at each of said stations being common to all of the plurality of stations.

9. In a spinning machine according to claim 8 wherein said compartment is sufficiently large in cross-section to maintain a substantially uniform partial vacuum throughout said compartment.

10. A spinning station according to claim 1 additionally com-prising a spinning rotor in the spinning chamber, said rotor having a reentrant cavity receiving the fiber from the passage and retaining by centrifugal force the fibers being spun into yarn while the rotor is revolving, said rotor being located in a partial vacuum sufficient to remove said fibers from the cavity in absence of said centrifugal force.