Method for processing a strand-shaped fiber sliver, and roving frame machine

Patent metadata

Field	Value
Publication number	US-10837128-B2
Application number	US-201716316780-A
Country	US
Kind code	B2
Filing date	Jun 27, 2017
Priority date	Jul 14, 2016
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A method for processing a strand-type fiber bundle includes sending the fiber bundle to an air nozzle of a pre-spinning machine used to produce roving. A twist is imparted to the fiber bundle via a vortex air current within the air nozzle to form the roving, wherein the roving leaves the air nozzle through an outlet and is deposited in a receptacle. Normal operation is interrupted in a stop phases during which roving is not produced by the air nozzle. A start-up phase is commenced between the stop phase and subsequent normal operation wherein the roving produced during the stop phase is discarded after leaving the air nozzle when quality of the roving does not meet a desired specification. The roving discharge is deactivated when the quality of the roving meets the desired specification and the roving removed by the roving discharge is separated from the roving.

First claim

The invention claimed is:

1. A method for processing a strand-type fiber bundle, comprising:
sending the strand-type fiber bundle to an air nozzle of a pre-spinning machine used to produce roving;
during normal operation, imparting a twist to the strand-type fiber bundle via a vortex air current within the air nozzle to form the roving from the strand-type fiber bundle, wherein the roving leaves the air nozzle through an outlet in the air nozzle;
from the outlet, depositing the roving in or on a receptacle;
interrupting the normal operation in a stop phases during which roving is not produced by the air nozzle;
performing a start-up phase between the stop phase and subsequent normal operation wherein the roving produced during the stop phase is discarded via a roving discharge after leaving the air nozzle when quality of the roving does not meet a desired specification; and
deactivating the roving discharge when the quality of the roving meets the desired specification and separating the roving removed by the roving discharge.

2. The method according to claim 1 , wherein the roving is drawn off from the air nozzle with a draw-off device and is deposited in a form of a loop in or on the receptacle.

3. The method according to claim 2 , wherein the roving is captured by a deposition device after passing through the draw-off device and is deposited in or on the receptacle device via the deposition device.

4. The method according to claim 3 , wherein the roving forms a curtain between the draw-off device and the deposition device, and wherein a vertical and spatial extent of the curtain is regulated by a deposition rate of the deposition device.

5. The method according to claim 1 , wherein a receptacle replacement operation is carried out when the receptacle has reached a defined level of filling or when a defined quantity of roving or length of roving has been produced by the air nozzle and deposited in or on the receptacle.

6. The method according to claim 5 , wherein production of the roving is not stopped during the receptacle replacement operation.

7. The method according to claim 6 , wherein the roving produced by the air nozzle during the receptacle replacement operation is discarded at least in some sections by a roving discharge mechanism.

8. The method according to claim 5 , wherein production of the roving is interrupted temporarily during the receptacle replacement operation.

9. The method according to claim 8 , wherein after the interruption in the roving production process, the start-up phase is performed.

10. The method according to claim 1 , wherein the receptacle is moved to an air-jet spinning machine that is used to produce yarn after being partially or completely filled with the roving.

11. The method according to claim 1 , wherein the receptacle is moved to a spinning/knitting machine that is used to produce a knit fabric after being partially or completely filled with the roving.

12. A pre-spinning machine for producing a roving from a strand-type fiber bundle, comprising:
an air nozzle comprising air jets configured to impart a twist to the strand-type fiber bundle via a vortex air current to produce a roving from the strand-type fiber bundle;
an outlet in the air nozzle through which the roving leaves the air nozzle during normal operation of the pre-spinning machine;
a deposition device disposed downstream of the air nozzle and configured to deposit the roving into or on a receptacle; and
wherein the pre-spinning machine is configured to operate in accordance with the method of claim 1 .

Assignees

• Rieter Ag Maschf

Inventors

• Griesshammer Christian
• Haska Petr

Classifications

• D01H1/115 Primary

  using pneumatic means · CPC title

• B65H54/76

  Depositing materials in cans or receptacles · CPC title

• D01H7/92 Primary

  for imparting transient twist {, i.e. false twist (D01H1/11 takes precedence)} · CPC title

• B65H54/88

  by means of pneumatic arrangements, e.g. suction guns · CPC title

• B65H51/20

  Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage · CPC title