Textiles: knitting – Needle cooperating elements – Sinkers or web holders
Patent
1998-06-11
2000-07-04
Worrell, Danny
Textiles: knitting
Needle cooperating elements
Sinkers or web holders
66 90, D04B 1506
Patent
active
060821426
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a sinker for selection and control of the loop-forming motions of knitting implements of a knitting machine to which is assigned a sinker which has the form of a flat bar according to basic shape as the control element which can be deflected in a guide groove of a sinker carrier in its longitudinal direction in alternative directions of movement
BACKGROUND AND SUMMARY OF THE INVENTION
In these knitting machines, for example, circular knitting machines which have a cylindrical sinker carrier which can be driven to rotate with vertical run of its central axis around it and which is located within the stator of the machine which has the form of a cylindrical jacket according to external shape and which coaxially surrounds the sinker carrier, the sinker carrier contains a plurality of sinkers, for example 2000 which are located next to one another in edge-open radial grooves which are equidistant in the azimuth direction, with a vertical run which is parallel to the center longitudinal axis of the plate carrier, in each of these grooves being a sinker which can move up and down.
For controlled driving of the sinkers in this regard, which takes place by relative rotational movements of the sinker carrier to the machine stator which is made as a cam carrier, the sinkers are provided with clearing feet which have contour edges which run transversely to the sinker guide direction; by their sliding away the deflections of the control sinkers are controlled via a drive cam of the stator provided with a clearing edge. In this case the control sinkers, by the action of a minimum prestress per control spring which proceeds from a base body of the sinker and which has a stretched rod shape in terms of basic shape, and which has a free end which is supported to slide on the base of the guide groove of the control sinker, are displaced into the engagement position of their clearing foot which transfers deflection driving, with the clearing edge of the clearing cam of the cam carrier. They can furthermore be displaced by control elements of the cam carrier and sinker carrier which work by force fit-form fit into a base position, in which the drive engagement of the clearing feet is cancelled with the clearing edge of the clearing cam. In this base position the sinkers can be fixed by the retaining force of a permanent magnet arrangement which has a holding action which can be cancelled by compensatory triggering of an electronically controllable magnet arrangement, so that the sinkers can be released by the action of the control springs for assuming the clearing position.
In known sinkers of this type (DE-39 15 684 C1) the control springs are made as spring steel rods with a cross section which is round, rectangular or uniform over its entire resilient length and with flattened anchoring pieces which are rectangular, flat-plate formed according to basic shape, and which has a thickness which is less than that of the sinker material which is equal to the diameter of the spring leg measured at a right angle to the longitudinal surfaces of the sinker, in flat groove-shaped depressions with cheek contour which is matched exactly to the contour of the anchoring pieces, anchored by force fit-form fit, the resilient rod passing through a short opening of the sinker material which discharges into an anchoring depression. To secure the spring rod against disarrangements in the anchoring depression of the sinker, on the edges of the depression which the anchoring section of the spring rod adjoins, there is caulking of the sinker material which in interaction with notches of the anchoring section yields a force-fit/form-fit connection of the spring rod with the sinker overall. The spring rods are fixed on the sinkers such that the center longitudinal axes of the spring rods run in the longitudinal center planes of the sinkers which extend between their large area shaft boundary surfaces.
The known sinkers are subject to at least the following disadvantages:
Production of the sinkers
REFERENCES:
patent: 1940520 (1933-12-01), Zimic
patent: 3643472 (1972-02-01), Apprich
patent: 4905484 (1990-03-01), Schindler
patent: 5076074 (1991-12-01), Halamoda et al.
Hans Ruster GmbH & Co.
Worrell Danny
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