Textiles: weaving – Warp manipulation – Feeding
Patent
1997-12-09
2000-09-12
Falik, Andy
Textiles: weaving
Warp manipulation
Feeding
2421311, 242559, 28190, B65H 5700, D02H 100, D04B 2710
Patent
active
061162922
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a detachable weaving frame that can be at least partly replaced on a continuously operating weaving machine without causing any interruption or any disturbance to the warp thread tension in the weaving zone.
Weaving frames are especially utilized in Jacquard weaving machines whereby each individual warp thread has a different yarn consumption during weaving. These weaving frames are disposed behind Jacquard weaving machines and are suited for carrying a large number of cross-wound spools or bobbins. This number corresponds to the total number of warp threads that are necessary for weaving pattern designs in different colors.
In the course of this text depth direction refers to warp direction, and width direction to weft direction.
In literature on the subject weaving frames are known that consist of a series of doors which extend in the depth direction and of which a number are disposed next to each other in the width direction of the weaving machine. Each weaving frame door is provided on both sides in height and depth with horizontal supporting spindles and thread guiding spindles. The bobbins are usually wound on a cardboard sleeve. This sleeve is placed on a cylindrical plastic sleeve, which is rotatable on the supporting spindle of the weaving frame. The bobbins can also be wound directly onto a plastic sleeve, so that they can be placed on the supporting spindle without additional plastic sleeve. The placing or changing of the bobbins in a weaving frame is carried out by a bobbin loader. For that purpose a passage is provided between each door of a weaving frame. The doors of a weaving frame can also be made rotatable or moveable.
From the bobbins that are placed in the weaving frame, the warp thread is pulled off (unwound) sideways and tangentially over the periphery. The pulled-off warp thread is first passed over a higher reversing guiding spindle located more toward the back and then brought back forward over the higher and forward lying reversing spindle of the forward lying bobbin. The warp threads run forward in the frame, into the throughput reed and the entrance grating, in order finally to come into the weaving zone of the weaving machine.
In order to exert a certain tension on the warp threads a first clamp or trammel is hung over the warp thread loop between the rear reversing guiding spindle and the bobbin in order to slow down the bobbin. A second clamp is hung between the front reversing guiding spindle and bobbin in order to pull back the warp thread out of the weaving zone. These two clamps or trammels that are hung on the warp thread together with the pulled-off loop form a type of band brake over the bobbin and thus establish a certain tension in the warp thread and also prevent the bobbin from unwinding on its own. The front clamp moreover also pulls the warp thread back out of the weaving zone. Hence the terms warp tensioning and pulling-back device of the weaving frame. With the known weaving frames this double function is exerted on and with the bobbin. This warp tensioning and pulling-back device is especially important with pile weaving machines for obtaining a uniform pile height and in order to make possible the interweaving of warp threads, which can take on more than two positions in the weaving shed.
When a Jacquard weaving machine has to be completely changed over to other weaving colors, the weaving machine is stopped in order to take all the bobbins out of the frame manually and in order to place new bobbins in the frame. This operation is labor-intensive and stopping the weaving machine signifies a certain production loss, with the result that the total output of the weaving machine will decrease the more color changes are performed.
Bobbin changes for the maintenance of a weaving frame or for changing certain neighboring pile warp threads can be performed on an operating weaving machine. The bobbin loader must moreover still work cautiously. Firstly both clamps or trammels have to be hung on the respective threa
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Creighton Wray James
Falik Andy
N.V. Michel Van de Wiele
Narasimhan Meera P.
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