Textiles: weaving – Pattern mechanism – Picture pattern
Patent
1990-03-19
1991-12-10
Falk, Andrew M.
Textiles: weaving
Pattern mechanism
Picture pattern
139 551, 139 59, 139455, 139 35, 66140R, D03C 1300
Patent
active
050709135
DESCRIPTION:
BRIEF SUMMARY
One object of this invention is to provide improved apparatus for, and method of, controlling the operation of a loom or similar weaving or textile machine in a manner hitherto achieved by Jacquard mechanism. In particular the invention provides for positive control of a loom or the like in the above manner and with a view to obtaining high speed operation but whereby the use of Jacquard mechanism is superseded and the disadvantages thereof thus avoided as will be hereinafter apparent. A further object of the invention is to provide for similar control of a knitting machine.
It has previously been proposed to provide controlled operation of loom warp thread mails or heald frames by fluid pressure operated piston and cylinder means but which has involved valve mechanism to the latter for such controlled operation.
According to the invention apparatus for controlling the operation of a loom or similar weaving machine or of a knitting machine to provide a preselected woven or knitted pattern, design or the like comprises a plurality of electronically controlled electric actuators each providing substantially linear positive actuation in either direction and each connected in use to a corresponding warp thread or to more than one of such threads of a loom shed of said threads, or to one or more of at least the yarn feeders of a knitting machine whereby said warp threads of the shed are operated or the yarn feeders are operated for the purpose of respectively weaving or knitting the preselected pattern, design or the like, the electronic control of the actuators being arranged for programmed operation by computer or like control means in accordance with said preselected pattern, design or the like to be woven or knitted.
Further in accordance with this invention there is provided the method of controlling the operation of a loom or similar weaving machine or of a knitting machine to provide a preselected woven or knitted pattern, design or the like wherein electronic control of a plurality of electric actuators each providing substantially linear positive actuation in either direction is programmed for operation by computer or like control means in accordance with the preselected pattern, design or the like to be knitted or woven and are each connected to a corresponding warp thread of a loom shed of said threads or to more than one of such threads or to one or more of at least the yarn feeders of a knitting machine whereby said warp threads of the shed are operated or the yarn feeders are operated for the purpose of respectively weaving or knitting the preselected pattern, design or the like.
Practical applications of the invention are shown in the accompanying diagrammatic drawings, in which:
FIGS. 1 and 2 respectively are schematic plan view of two arrangements of loom control operation;
FIG. 3 is a schematic plan view of a detail development of the inventions;
FIG. 4 is a schematic elevational view of an arrangement of the invention applied to a heddle frame operation;
FIGS. 5, 6 and 7 are schematic views of different shed formations which can be achieved in accordance with the invention;
FIG. 8 is a schematic plan view showing the application of the invention to a knitting machine, and
FIG. 9 is a schematic plan view of an arrangement for increasing the stroke of a linear actuator in accordance with the invention.
Like parts are referred to by the same or similar reference numerals or letters throughout the drawings.
Referring to FIG. 1 and for the operation of each warp thread W of a shed S, an electronically controlled electric linear actuator .1 having positive operation in either direction is connected by a flexible elongate heddle or heald member 2 such as cord, twine, thread (e.g. nylon thread) or the like to the warp thread W by the usual eye 3 through which the warp thread passes. The cord 2 continues downwardly are 2' from the eye 3 and is returned in an endless manner to the actuator 1, the cord 2 being guided by pulleys 4 or other suitable guide means for such arrangement and back and forth oper
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patent: 4530382 (1985-07-01), Schleicher
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patent: 4702286 (1987-10-01), Palau
patent: 4732179 (1988-03-01), Takegawa
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Brown Charles A.
Falk Andrew M.
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