Textiles: weaving – Pile tufting – Portable supply
Reexamination Certificate
2000-07-26
2001-09-18
Falik, Andy (Department: 3765)
Textiles: weaving
Pile tufting
Portable supply
Reexamination Certificate
active
06289938
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a device for selecting pile yarns in gripper Axminster weaving machines, more specifically in carpet weaving machines of the gripper Axminster type. With such weaving machines the pile yarns of different colors are placed in a number of elongated pile yarn carriers axially movable according to their length. Each pile yarn carrier is provided for positioning a number of pile yarn ends at mutual distance according to the length of the pile yarn carrier. Each pile yarn carrier is provided with a number of pins at mutual distance according to the length of the pile yarn carrier corresponding to the number of colors. Each pile yarn carrier is under control of a control device according to a pattern, through the pin for the selected pile yarn which works together with a sliding mechanism, axially movable according to its length, in order to present the pile yarn end of the selected pile yarn to an associated gripper jaw for taking up a pile yarn end.
In such carpet weaving machines the pile yarns are held in pile yarn carriers which protrude in a horizontally, obliquely or vertically disposed direction. The pile yarn ends protrude out of the pile yarn carriers sufficiently on one side in order to be taken along by gripper jaws. The gripper jaws are rotatably disposed in order to grip the protruding pile yarn ends in an upwardly rotating movement and in order to bring these downward, so that they can be woven into the backing fabric of the carpet.
Patent publication GB 1 150 822 describes a known jacquard device for selecting pile yarns with a different color in gripper Axminster weaving machines. This jacquard device provides horizontally disposed pile yarn carriers, which are moved in a horizontal direction, so that the pile yarn with the selected color is brought to the pick line of the gripper jaws. With these weaving machines the pile yarns extend in an almost vertical direction. In order that the gripper jaws would be able to take up a selected color according to pattern, the various pile yarns are placed next to each other in one and the same pile yarn carrier. This arrangement is favorable for achieving a high weaving speed.
The selected color according to the pattern to be woven is therefore obtained by a sliding of the pile yarn carriers performed by a jacquard device, in a common horizontal plane, until the pile yarn with the selected color comes to lie just above the pick line of the gripper jaws. With GB 1 150 822 the selection occurs by means of a paper card as data carrier. This device has a card switching device and an pressing device which pushed a pin corresponding to the color to be selected out of the pile yarn carriers. Through a sliding mechanism the pins are brought into a line through which the pile yarn carriers will slide and therefore the selected color is brought to the line of the gripper jaws. Each color to be selected has a specific position on the card. A perforation in that specific position in the paper card signifies the corresponding color is not selected and no perforation signifies that the corresponding color is selected. The production of a such a perforated paper card is very time-consuming and expensive and the device is rather laborious because a rotating movement and a vertical pressing movement of the prismatic cylinder have to be provided.
SUMMARY OF THE INVENTION
The purpose of the invention is to develop a pile yarn selection system for gripper Axminster weaving machines that is suitable for high weaving speeds and that can be electronically controlled from a control device.
In order to achieve the above mentioned purpose the invention provides a pile yarn selection system for gripper Axminster weaving machines, characterized in that the pile yarn carrier is provided with a number of compressed air cylinders each of which is connected to a pin for a pile yarn, and in that the control device comprises electrically controlled means for sending compressed air according to the pattern to the compressed air cylinders in order to make the pin for the selected pile yarn work together with the sliding mechanism.
By providing the compressed air cylinders for each pile yarn in a pile yarn carrier, and by supplying compressed air to the compressed air cylinders by means of electronically controllable means, high weaving speeds can be achieved and the selection of pile yarns can be electronically controlled from a control device.
In an advantageous embodiment the movement of the pile yarn carriers occurs in a predominantly horizontal direction.
In an advantageous embodiment the electronically controlled means comprise a valve block. The compressed air cylinders are preferably connected to the valve block by flexible compressed air tubes. The compressed air tubes have a length so that the pile yarn carriers can slide in horizontal direction over a length equal to the distance between two pile yarns farthest distant form each other.
According to a preferred embodiment of the invention the control device comprises a control for the electronically driving of the valves of the valve block. According to another preferred embodiment the valve block is connected to a cross beam which functions as compressed air reservoir.
In an advantageous embodiment each pin for a pile yarn is connected to the piston rod of a compressed air cylinder. The pin is preferably brought into one extreme position by driving the compressed air cylinder with compressed air, while it is brought into the other extreme position by spring pressure. According to the preferred embodiment the pin can work together with the sliding mechanism while the corresponding compressed air cylinder is controlled by compressed air.
The characteristics and distinctive features of the invention, and the operation thereof are further explained below with reference to the attached drawing which shows a preferred embodiment of the invention. It should be noted that the specific aspects of this embodiment are only described as preferred example of what is intended in the scope of the above general specification of the invention, and may in no way be interpreted as a restriction on the scope of the invention.
REFERENCES:
patent: 2915090 (1959-12-01), Parsons et al.
patent: 5743306 (1998-04-01), Stewart et al.
patent: 0 379 387 (1990-07-01), None
patent: 1 150 822 (1969-05-01), None
patent: 2 286 601 (1995-08-01), None
Creighton Wray James
Falik Andy
N. V. Michel Van De Wiele
Narasimhan Meera P.
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