Textiles: knitting – Independent-needle machines – Straight
Patent
1991-04-26
1993-10-26
Crowder, Clifford D.
Textiles: knitting
Independent-needle machines
Straight
66 78, 66123, D04B 1470, D04B 1536
Patent
active
052555372
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a flat-bed knitting machine comprising flexible shank needles arranged in the needle channels of the needle bed, each said needle having an anterior first needle butt always projecting from the needle bed and a posterior second needle butt which sinks into the needle bed under the resilience of its own flexible shank, displacing jacks (pushers) located behind the flexible shank needles, each said jack having an operating butt and a forward end which is displaceable under the flexible shaft of the flexible shank needle for selectively lifting the second needle butt, jacquard jacks located behind and slideable on the displacing jacks and a cam system arranged symmetrically about its central longitudinal axis for selecting and operating the needles and jacks and which, in the region of the second needle butts, has at least two needle sinkers displaceable in the cam plane.
Such a flat-bed knitting machine is known for example from DE 35 23 989 C1. In this patent the displacing jacks are formed as arresting or locking jacks which allow the second needle butts to be selectively lifted into a working position for engaging with cams of the cam-system. This known flat-bed knitting machine enables the needle channels to be milled without interruption, i.e., at a single pass with a constant milling-depth, without affecting the machine's full knitting capabilities including those of transferring stitches and loops, possibly of different withdrawal depths i.e. sizes, in the same row.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a flat-bed knitting machine of the type described above with an improved and simplified cam- and knitting-system wherein the number of non-fixed cams of the cam system and the means required to control them are reduced while retaining the machine's simplicity of construction and manufacture.
This is achieved in accordance with the invention, in that having a two-stepped forward end wherein a first top-edge serves to lift the second needle butt into a half-height working position and a contiguous second top-edge serves to lift the second needle butt into a full-height working position; cam system is provided on the central longitudinal axis of the cam system within camming range of the first needle butts; central longitudinal axis of the cam system and are moveable perpendicularly to the cam plane, wherein the control tongue or within camming range of the second needle butts and the needle sinkers.
In a flat bed knitting machine having such a cam and knitting system, a simple to construct and operationally reliable cam system for constant needle withdrawal (i.e., for forming stitches and loops of equal size), is realised.
Preferably the flat bed knitting machine according to the invention is also arranged such that independently displaceable sections, of which half-height or a half-height and full-height working position and full-height working position central longitudinal axis of the cam system and are moveable perpendicularly to the cam plane, wherein lifting jacks; central longitudinal axis of the cam system, are moveable perpendicularly to the cam plane, and are located within camming range of the operating butts of the lifting jacks.
The flat bed knitting machine according to the invention provides the full range of weaving techniques, including transfer of stitches and forming stitches of different withdrawal depths, i.e., sizes, within a same row, by means of a very simply made needle bed and a very simple, compact and operationally reliable cam system.
Preferably the first group of cams is operated as a whole by the return motion of the carriage.
In a cam system which allows various needle withdrawals to be selected, the cams of the first, second and third groups of cams are all operated together by the return motion of the carriage.
Advantageously, the lifting jack at its forward end has a first inclined cam face followed by a half-height first lifting surface and a contiguous second inclined cam fa
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Crowder Clifford D.
Worrell Jr. Larry D.
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