Textiles: knitting – Needles – Sliding latch
Patent
1991-03-28
1993-04-13
Schroeder, Werner H.
Textiles: knitting
Needles
Sliding latch
66123, D04B 3506
Patent
active
052011984
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a slider needle for knitting machines comprising a needle body provided with a needle hook and at least one needle butt, a slider displaceably mounted in the needle body and provided with a slider butt and a swinging member articulated on the needle body behind the needle hook. Such a slider needle is known from DE-C3-151 150.
A latch needle for high speed flat knitting machines whose needle latch completely closes the head of the needle and which is pivotable by an associated spring element into a partly open intermediate position is known from DE-C3-3 702 019.
SUMMARY OF THE INVENTION
The object of the invention is to provide a slider needle of the kind described above which ensures a trouble-free and reliable separation of the old stitch from the newly laid yarn and which enables a shortening of the distance which is required for driving out the slider needle while forming stitches.
In accordance with the invention this object is achieved by means of a spring which is arranged in the needle body of a known slider needle of the type described above and which serves to hold the swinging member in a position projecting beyond the needle body.
Through constructing the slider needle in this way, the swinging member can be located very close to the needle hook, whereby the distances travelled by the slider needles when forming stitches can be considerably reduced. The old stitch is also reliably separated from the newly laid yarn. It slides very freely over the swinging member, which is then able to swing upwardly under spring pressure as soon as it is freed from the stitch. This also ensures a trouble free and reliable separation of the old stitch from the newly laid yarn even on the first needle following a carriage return when the invention is being used in conjunction with flat knitting machines or reciprocating circular knitting machines.
According to a further feature of the invention, the swinging member is rotatable away from the needle hook against the effect of the spring. In this way, when the slider needle is being driven out, the stitch can slide freely out of the needle hook.
It is also advantageous that when the swinging member pivots away from the needle hook, it substantially disappears into the body of the needle. In this way, the movement of the stitch is even further facilitated. Thereby it is possible to form a small stitch as well as to maintain the quality of the knitted stitches.
According to a further advantageous embodiment of the invention, the swinging member is substantially triangular shaped. This results in particular advantages for the movement of the stitch over the needle and the retention of the stitch on the reverse side of the swinging member after this movement.
In this connection, it is of further advantage if the swinging member has a first lateral edge, on the side thereof facing towards the needle hook, which provides a glide-surface rising up from the body of the needle in a direction away from the needle hook when the swinging member is in its projecting position. By means of the rising glide-surface on the lateral edge facing the needle hook, there results a uniform movement of the stitch over the swinging member so that this can be continually pressed down against the pressure of the spring and the stitch can slide behind the swinging member.
Preferably, the swinging member has a second lateral edge facing away from the needle hook, which extends substantially perpendicularly to the longitudinal axis of the slider needle when the swinging member is in its projecting position. In this way, it is ensured that the stitch which has slidden behind the swinging member can not slide back prematurely onto the needle hook thereby ensuring a trouble-free and reliable separation of the old stitch from the newly laid yarn especially on the first needle following a carriage return.
It is especially advantageous, if the needle body is provided with a stop which limits the swinging movement of the swinging member towards t
REFERENCES:
patent: 3050968 (1962-08-01), Masujima
patent: 4043153 (1977-08-01), Lindner et al.
patent: 4448045 (1984-05-01), Kuhnert
patent: 4791794 (1988-12-01), Schmoll
Schroeder Werner H.
Universal Maschinenfabrik Dr. Rudolf Schieber GmbH & Co.
Worrell Jr. Larry D.
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