Weft picking method and device for carrying out same
AssigneeNissan Motor Co., Ltd.
InventorTakao Takahashi
Life of this patent
Estimating the term…
Abstract
In an air jet loom of the type wherein a weft yarn projected from a weft inserting nozzle is carried through a weft guide channel to pick the weft yarn into a shed of warp yarns by air jets from a plurality of auxiliary nozzles, weft picking is carried out by controlling the ejection of air jets from the auxiliary nozzles in a manner to simultaneously commence the air jet ejections from all the auxiliary nozzles prior to the time the weft yarn from the weft inserting nozzle reaches the auxiliary nozzle closest to the weft inserting nozzle, thereby producing a steady state air steam within the weft guide channel to stably complete a weft insertion into the shed of warp yarns.
Claims12
A method of weft picking in an air jet loom of the type wherein a weft yarn projected by an air jet from a weft inserting nozzle is carried through a weft guide channel to pick the weft yarn into the shed of warp yarns by air jets from a plurality of auxiliary nozzles, said method comprising the steps of:
- controlling the ejection of air jets from said auxiliary nozzles in a manner to simultaneously commence the air jet ejections from all said auxiliary nozzles prior to the time the weft yarn from said weft inserting nozzle reaches the auxiliary nozzle closest to said weft inserting nozzle, maintaining the air jet ejections from all said auxiliary nozzles for a selected time interval, and thereafter successively stopping the air jet ejections from the respective auxiliary nozzles in the order of the weft yarn passing by said auxiliary nozzles.
A method of weft picking in an air jet loom, comprising the steps of:
- projecting a weft yarn from a weft inserting nozzle under the influence of an air jet ejected from said weft inserting nozzle;
- carrying said weft yarn from said weft inserting nozzle through a weft guide channel to pick the weft yarn into the shed of warp yarns by ejecting air jets from a plurality of auxiliary nozzles;
- and
- controlling the ejection of air jets from said auxiliary nozzles in a manner (1) to simultaneously commence the air jet ejections from all said auxiliary nozzles prior to the time the weft yarn from said weft inserting nozzle reaches the auxiliary nozzle closest to said weft inserting nozzle, (2) maintaining the air jet ejections from all said auxiliary nozzles for a predetermined time interval, and (3) thereafter successively stopping the air jet ejections from the respective auxiliary nozzles in the order of the weft yarn passing by said auxiliary nozzles.
A method of weft picking in an air jet loom equipped with a weft inserting nozzle, and first, second, and third groups of auxiliary nozzles which are closer to said weft inserting nozzle in the order named, and a plurality of closed type air guide members to define a weft guide channel, and a weft yarn grasping device, said method comprising the steps, in the following order, of
- simultaneously commencing the air jet ejections from said weft inserting nozzle and all of said auxiliary nozzles,
- maintaining the air ejections from all of said auxiliary nozzles
- operating said grasping device to release the weft yarn to allow it to move,
- stopping the air jet ejections from said first group of auxiliary nozzles,
- stopping the air jet ejections from the second group of auxiliary nozzles,
- stopping the air jet ejections from said weft inserting nozzle,
- stopping the air jet ejections from said third group of auxiliary nozzles, simultaneously with operating said grasping device to catch the weft yarn to stop the movement thereof.
A weft picking device of an air jet loom, comprising:
- a weft inserting nozzle for projecting a weft yarn under the influence of an air jet ejected therefrom;
- air guide means defining a weft guide channel through which the weft yarn from said weft yarn inserting nozzle is picked into the shed of warp yarns;
- a plurality of auxiliary nozzles for ejecting air jets to carry the weft yarn from said weft inserting nozzle through the weft guide channel;
- and
- means for controlling the ejection of air jets from said auxiliary nozzles in a manner (1) to simultaneously commence the air jet ejections from all of said auxiliary nozzles prior to the time the weft yarn from said weft inserting nozzle reaches the auxiliary nozzle closest to said weft inserting nozzle, (2) to maintain the air jet ejections from all said auxiliary nozzles for a selected time interval, and (3) thereafter successively stopping the air jet ejections from the respective auxiliary nozzles in the order of the weft yarn passing by said auxiliary nozzles.
Dependencies are inferred from the claim text.