# US 4,392,517 A · Weft picking method and device for carrying out same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,392,517 A - Document ID: US4392517A - Status: Granted - Kind: A - Application number: 06/218,325 - Filed: 1980-12-19 - Granted: 1983-07-12 - Earliest claimed: 1979-12-26 - Assignees: Nissan Motor Co., Ltd. - Inventors: Takao Takahashi - Web page: https://patentgrep.com/patent/US4392517A ## CPC - D03D 47/306: {Construction or details of parts, e.g. valves, ducts} - D03D 47/304: {Controlling of the air supply to the auxiliary nozzles} - D03D 47/3053: {Arrangements or lay out of air supply systems} - D03D: WOVEN FABRICS; METHODS OF WEAVING; LOOMS ## 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. ## Claims ### Claim 1 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. ### Claim 2 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. ### Claim 3 (depends on 2) A method as claimed in claim 2, wherein said plurality of auxiliary nozzles is divided into a plurality of groups, wherein the air jet ejection controlling steps include the step of controlling the air jet ejections from the same group of auxiliary nozzles simultaneously in a manner to commence and stop the air jet ejections from the same group of auxiliary nozzles. ### Claim 4 (depends on 3) A method as claimed in claim 3, wherein said plurality of groups of auxiliary nozzles includes first, second, and third groups which are closer to said weft inserting nozzle in the order named, and wherein the air jet ejection controlling step includes the steps, in the following order, of: simultaneously commencing the air jet ejections from all of said auxiliary nozzles, and stopping air jet ejections from said first, second, and third groups of auxiliary nozzles in the order named. ### Claim 5 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. ### Claim 6 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. ### Claim 7 (depends on 6) A weft picking device as claimed in claim 6, wherein said plurality of auxiliary nozzles is divided into a plurality of groups, and wherein said air jet ejection controlling means includes means for controlling the air jet ejection from the same group of auxiliary nozzles simultaneously in a manner to commence and stop the air jet ejections from the same group of auxiliary nozzles. ### Claim 8 (depends on 7) A weft picking device as claimed in claim 7, wherein said plurality of groups of auxiliary nozzles includes first, second, and third groups which are closer to said weft inserting nozzles in the order named. ### Claim 9 (depends on 8) A weft picking device as claimed in claim 8, wherein said air jet ejection controlling means includes means for controlling air jet ejections from said plurality of groups of auxiliary nozzles in a manner to firstly simultaneously commence the air jet ejections from all of said auxiliary nozzles, and thereafter stop the air jet ejections from said first, second, and third groups of auxiliary nozzles in the order named. ### Claim 10 (depends on 8) A weft picking device as claimed in claim 8, further comprising weft yarn grasping means for catching and releasing the moving weft yarn prior to the introduction of the weft yarn into said weft guide channel, in accordance with the operational cycle of the loom. ### Claim 11 (depends on 10) A weft picking device as claimed in claim 10, wherein said air jets ejection controlling means includes means for controlling the operations of said weft inserting nozzle, said auxiliary nozzles, and said grasping means in a manner to firstly simultaneously commence air jet ejections from said weft inserting nozzle and all of said auxiliary nozzles, secondly operate said grasping means to release the weft yarn to allow it to move, thirdly stop the air jet ejections from said first group of auxiliary nozzles, fourthly stop the air jet ejections from said second group of auxiliary nozzles, fifthly stop the air jet ejection from said weft inserting nozzle, and lastly stop the air jet ejection from said third group of auxiliary nozzles simultaneously with operating said grasping means to catch the weft yarn to stop the movement thereof. ### Claim 12 (depends on 6) A weft picking device as claimed in claim 6, wherein said air guide means includes a plurality of air guide members each of which is formed with an almost closed annular section defining therein an air guide opening, said air guide member annular section having a slit communicating with said air guide opening through which slit the weft yarn is capable of exiting the air guide opening in accordance with the loom operational cycle, said weft guide channel being formed by successive air guide openings of said air guide members.