Weft insertion method and weft insertion device for air jet loom

Patent metadata

Field	Value
Publication number	US-12247331-B2
Application number	US-202218085019-A
Country	US
Kind code	B2
Filing date	Dec 20, 2022
Priority date	Jan 28, 2022
Publication date	Mar 11, 2025
Grant date	Mar 11, 2025

Abstract

A weft insertion device includes a first main nozzle and a second main nozzle that is arranged upstream from the first main nozzle in a weft insertion direction and is configured to function as an auxiliary main nozzle. The first main nozzle is connectable to a first valve device by a first piping. The second main nozzle is connectable to a second valve device by a second piping shorter than the first piping. The weft insertion device is configured to supply compressed air to each main nozzle with each valve device being in an open state over a jet period from a predetermined jet starting timing. In a predetermined initial jet period that begins at the jet starting timing, an operating state of the second valve device is put into a small flow rate state, in which a flow rate smaller than a steady flow rate is supplied.

First claim

The invention claimed is:

1. A weft insertion method for an air jet loom, wherein
the loom comprises a weft insertion device including:
a first main nozzle for weft insertion; and
a second main nozzle that is arranged upstream from the first main nozzle in a weft insertion direction and is configured to function as an auxiliary main nozzle,

the first main nozzle is connectable to a first valve device by a first piping,
the second main nozzle is connectable to a second valve device by a second piping shorter than the first piping,
the weft insertion device is configured to supply compressed air to each main nozzle with each valve device being in an open state over a jet period from a predetermined jet starting timing,
the second valve device includes a single lead-in flow path into which compressed air is supplied and is configured by combining:
a valve for steady flow rate that implements a state in which the steady flow rate, which is a flow rate in a steady state of jet, is supplied; and
a valve for small flow rate that implements a small flow rate state, which is a state in which a flow rate smaller than the steady flow rate is supplied,
the second valve device is configured to switch an operating state of the second valve device between the state in which the steady flow rate is supplied and the small flow rate state,

the weft insertion device further comprises:
a storage unit configured to store a predetermined initial jet period that begins at the jet starting timing; and
a control device configured to switch the operating state of the second valve device and to put the operating state of the second valve device into the small flow rate state in a period corresponding to the predetermined initial jet period, the period being in the jet period, and

in the predetermined initial jet period that begins at the predetermined jet starting timing, the operating state of the second valve device is put into the small flow rate state, in which the flow rate smaller than the steady flow rate is supplied.

2. The weft insertion method according to claim 1 , wherein the weft insertion device further includes a third main nozzle that is arranged upstream from the second main nozzle in the weft insertion direction and is connectable to a third valve device, and,
over the jet period, the third valve device is put into the state in which the steady flow rate is supplied.

3. The weft insertion method according to claim 2 , wherein
the second valve device is provided integrally with the second main nozzle.

4. The weft insertion method according to claim 1 , wherein
the second valve device is provided integrally with the second main nozzle.

5. A weft insertion device for an air jet loom comprising:
a first main nozzle for weft insertion; and
a second main nozzle that is arranged upstream from the first main nozzle in a weft insertion direction and is configured to function as an auxiliary main nozzle, wherein
the first main nozzle is connectable to a first valve device by a first piping,
the second main nozzle is connectable to a second valve device by a second piping shorter than the first piping,
the weft insertion device is configured to supply compressed air to each main nozzle with each valve device being in an open state over a jet period from a predetermined jet starting timing,
the second valve device includes a single lead-in flow path into which compressed air is supplied and is configured by combining:
a valve for steady flow rate that implements a state in which the steady flow rate, which is a flow rate in a steady state of jet, is supplied; and
a valve for small flow rate that implements a small flow rate state, which is a state in which a flow rate smaller than the steady flow rate is supplied,
the second valve device is configured to switch an operating state of the second valve device between the state in which the steady flow rate is supplied and the small flow rate state, and

the weft insertion device further comprises:
a storage unit configured to store a predetermined initial jet period that begins at the jet starting timing; and
a control device configured to switch the operating state of the second valve device and to put the operating state of the second valve device into the small flow rate state in a period corresponding to the predetermined initial jet period, the period being in the jet period.

6. The weft insertion device according to claim 5 , wherein
the weft insertion device further comprises a third main nozzle that is arranged upstream from the second main nozzle in the weft insertion direction and is connectable to a third valve device, and,
over the jet period, the third valve device is put into a state in which the steady flow rate is supplied.

7. The weft insertion device according to claim 6 , wherein
the second valve device is provided integrally with the second main nozzle.

8. The weft insertion device according to claim 5 , wherein
the second valve device is provided integrally with the second main nozzle.

Assignees

• Tsudakoma Ind Co Ltd

Inventors

• Myogi Keiichi
• Yama Kazuya
• Taima Toshiya

Classifications

• D03D47/3013

  Main nozzles · CPC title

• D03D47/3026 Primary

  Air supply systems · CPC title

• D03D47/3033 Primary

  Controlling the air supply · CPC title

• D03D47/30 Primary

  by gas jet · CPC title