Textiles: knitting – Needle cooperating elements – Sinkers or web holders
Patent
1982-10-21
1985-08-06
Reynolds, Wm. Carter
Textiles: knitting
Needle cooperating elements
Sinkers or web holders
66106, 66115, D04B 1506, D04B 1514
Patent
active
045327815
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a knitting machine having a needle carrier, which is equipped with needles that are displaceable in the longitudinal direction and controlled by a needle cam. Sinkers controlled by a sinker cam protrude between the needles, projecting beyond the rim of the needle carrier, each sinker having its own sinker shaft. The sinkers are supported such that they are movable both transversely with respect to the needles and in their longitudinal direction and are controlled such that at a given knitting position, after the loop has been closed, they are moved outward, counter to the drawing-off movement of the associated needles and transversely thereto, while after the casting off of the knit loop they are moved inward, counter to the needle projection movement and transversely thereto.
BACKGROUND
A circular knitting machine of this type is known from German Disclosure Document DE-OS No. 2 025 144. The sinkers of that machine are moved counter to the needle drawing-off movement after the closing of the loop, that is, during the actual process of forming the loops. Consequently the distance which the needles must travel during the drawing-off movement becomes correspondingly shorter, so that the needle cam can be less steep. This permits a substantial increase in the knitting speed without an associated excessive stress on the needles. The transverse movement of the sinkers with respect to the associated needles which occurs after the loop has been closed serves to guide the sinkers into the correct position for casting off. After the process of forming the loop has been completed, when a given needle is once again projected, the corresponding sinkers are again moved back into the initial position, counter to the projection movement of the needle; in this operation, the sinkers are first moved transversely relative to the needles, in order that with their throat and tip they will encompass the half-completed row of loops and prevent the knitted goods from being pulled along with the projection movement of the needles.
In this circular knitting machine, the sinkers, each having a sinker shaft, are supported together with their sinker shafts on a sinker cam, which is disposed outside a sinker ring screwed to the needle cylinder. The sinker ring is provided with a horizontal flange in which radial slits are formed; the individual sinkers are guided radially movably in these slits. The control of the radial movement, which is transverse to the needles, is effected by a specialized embodiment of the sinker cam, which simultaneously controls the projection of the sinkers. Associated with this sinker cam is a retraction control cam for the sinkers, which is disposed on a cup-shaped, stationary machine head protruding beyond the flange of the sinker ring.
The structure of this circular knitting machine is relatively complicated; among other factors, it requires that the needles inserted into the guide grooves of the needle cylinder be surrounded at the outside not only by the sinker ring but also by the sinker cam and the sinker shafts. Furthermore, the sinker control cam controls two movements and is therefore relatively complicated; on the other hand, a certain minimum value for the needle cut must at least be met, because otherwise it would no longer be possible to provide satisfactory support for the sinkers in the slits of the sinker ring flange.
THE INVENTION
The object of the invention in general is to create a knitting machine having sinkers that can be moved longitudinally and transversely to the needle movement which is simple and operationally reliable in its design and which permits the attainment of a very fine needle cut, while at the same time, it is capable of operating at high speed.
Briefly, the sinkers, with their shafts, are guided on the needle carrier. The sinker shafts simultaneously form quide ribs for the adjacent needle shafts. A projection cam which imparts to the sinkers the movement transverse to the needles is disposed directly on the needle carrier.
Because the si
REFERENCES:
patent: 492539 (1893-02-01), Diebel
patent: 575012 (1897-01-01), Sturgess
patent: 1882430 (1932-10-01), Lawson
patent: 1952928 (1934-03-01), Lawson
patent: 2016870 (1935-10-01), Meiwald
patent: 2101005 (1937-11-01), Lawson
patent: 4018063 (1977-04-01), Buck
Memminger GmbH
Reynolds Wm. Carter
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