Weaving bar prevention in a jet loom
AssigneeKabushiki Kaisha Toyoda Jidoshokki Seisakusho
InventorsMasami Shinbara, Fumio Yasuoka
Life of this patent
Estimating the term…
Abstract
Upon slow operation of a loom, a feed-out motor for a warp beam or a wind-up motor for a surface roller is driven to thereby displace a cloth fell of woven fabric from a normal position toward the fabric, and upon completion of the slow operation, the motor is driven reversely to allow the cloth fell to ressume the normal position. The cloth fell is thereby prevented from being beaten by a reed while protecting woven fabric from generation of weaving bar. Suppression of the weaving bar can also be realized by varying warp tension or a one-shot weft insertion performed from a main weft inserting nozzle while causing auxiliary nozzles to previously produce jets simultaneously or in relays.
Claims27
An apparatus for preventing generation of a weaving bar in a room during suspension of weaving comprising:
- means for displacing in the warp direction the position of the cloth fell of the fabric being woven;
- and
- means for controlling the amount of displacement of said cloth fell position by said cloth fell position displacing means;
- said displacement control means including first control means for driving said cloth fell position displacing means so as to displace said cloth fell from a normal position in the uptake direction of the woven fabric by a predetermined amount before completion of a slow revolution of a crankshaft of the loom, and second control means for driving said cloth fell position displacing means to return said cloth fell to said normal position after completion of said slow revolution of the loom crankshaft.
An apparatus for preventing the generation of a weaving bar in a loom during suspension of weaving comprising:
- means for changing the wrap tension;
- means for presetting the warp tension desired during slow operation of said loom which slow operation occurs during suspension of the weaving operation, said presetting being selected to avoid the tendency of generation of the weaving bar due to the slow operation of the loom which occurs during suspension of the weaving operation;
- and
- means for controlling said warp tension changing means so that the warp tension preset by said means for presetting the warp tension becomes effective during the slow operation of said loom occurring during suspension of said weaving operation.
In a jet loom in which weft is ejected for insertion by a jet of fluid from a main weft inserting nozzle, said ejected weft being drawn by fluid jets from a plurality of auxiliary weft inserting nozzles, a one-shot weft inserting method following a weft insertion failure comprising the steps of:
- after stopping weaving and removing a faulty weft operating all of said auxiliary weft inserting nozzles so that jets are produced simultaneously by all of said auxiliary weft inserting nozzles and
- subsequently inserting one weft under the action of a jet ejected from said main weft inserting nozzle before resuming weaving.
In a jet loom in which a weft is ejected for insertion by a jet of fluid from a main weft inserting nozzle, and thereafter drawn by fluid jets produced by a plurality of auxiliary weft inserting nozzles, a one-shot weft inserting method for replacing a faulty weft, comprising the steps of:
- moving the cloth fell of a woven fabric from a normal position of the cloth fell in the direction of the uptake of the woven fabric prior to performing a slow reverse revolution of the loom for removing from the cloth fell the weft inserted immediately before suspension of weaving;
- causing the cloth fell to return to said normal position after said slow reverse revolution of said loom;
- removing from said cloth fell the weft inserted immediately before the weaving has been suspended;
- operating all of said auxiliary weft inserting nozzles to thereby produce fluid jets simultaneously from said nozzles;
- and
- inserting one weft ejected from said weft inserting main nozzle prior to starting the weaving operation.
In a jet loom in which a weft is inserted under action of jets produced by a main weft inserting nozzle and a plurality of auxiliary nozzles, a method of preventing generation of a weaving bar in a cloth being woven by said loom during suspension of weaving, comprising the steps of:
- stopping weaving operation;
- removing the weft inserted immediately before said stopping of said weaving operation;
- and
- inserting one new weft to replace said removed weft under the action of the jet produced by said main weft inserting nozzle and the jets produced sequentially by said respective auxiliary weft inserting nozzles prior to restarting weaving operation.
In a jet loom in which a weft is inserted under action of jets produced by a main weft inserting nozzle and a plurality of auxiliary weft inserting nozzles, a method of preventing generation of a weaving bar in a cloth being woven by said loom during suspension of weaving comprising the steps of:
- suspending the weaving operation;
- moving the cloth fell of a woven cloth from the normal position of the cloth fell in the direction of the uptake of the woven cloth prior to performing a slow reverse revolution of the loom for removing from the cloth fell the weft inserted immediately before said suspending of the weaving operation;
- causing the cloth fell to return to said normal position after said slow reverse revolution of said loom;
- removing from the cloth fell the weft inserted immediately before the weaving was suspended;
- and
- inserting one new weft to replace said removed weft under the action of the jet produced by said main weft inserting nozzle and the jets produced sequentially by said plurality of auxiliary weft inserting nozzles prior to restarting weaving operation.
In a loom in which a weft is inserted under action of fluid jets produced by a main weft inserting nozzle and a plurality of auxiliary weft inserting nozzles, an apparatus for preventing generation of a weaving bar during suspension of weaving comprising:
- means for removing a weft inserted immediately before stoppage of weaving to remove it from a cloth fell;
- means for controlling energization/deenergization of a plurality of electromagnetic valves fluidly associated with said main weft inserting nozzle and said auxiliary weft inserting nozzles to supply fluid thereto;
- means for displacing the position of the cloth fell of the woven fabric in the direction parallel to the warps;
- and
- means for controlling the amount of displacement of the cloth fell by said cloth fell position displacing means;
- wherein said means for controlling said valves is imparted with a jet control function for causing said main weft inserting nozzle and said auxiliary weft inserting nozzles to produce the fluid jets in sequence to thereby insert one new weft for replacing said weft removed from the cloth fell by said weft removing means;
- and
- wherein said means for controlling the amount of displacement is imparted with a first control function for driving the cloth fell position displacing means to displace the cloth fell from the normal position thereof in the direction of the uptake of the woven fabric by a predetermined amount upon slow revolution of the loom, and a second control function for driving said cloth fell position displacing means to cause the cloth fell to resume said normal position after the slow revolution of the loom.
Dependencies are inferred from the claim text.