Textiles: knitting – Needle cooperating elements – Sinkers or web holders
Utility Patent
1999-05-19
2001-01-02
Falik, Andy (Department: 3741)
Textiles: knitting
Needle cooperating elements
Sinkers or web holders
C066S217000, C066S220000
Utility Patent
active
06167730
ABSTRACT:
The invention relates to a sinker for a circular knitting machine and having a shaft which has an upper side and a back and which has a recess open towards the upper side.
Circular knitting machines for producing patterned knitwear frequently have a needle cylinder for receiving cylinder needles and a sinker ring assigned to the needle cylinder for receiving sinkers, especially holding-down sinkers and knockover sinkers. On account of the pattern, it can be desirable thereby to cause the needles and/or sinkers on individual or all of the knitting systems to carry out pre-selected movements with the help of mechanically, electrically or electromagnetically operating selection devices in order to thus control the knitting process. When producing plush goods it is known for example to move sinkers of the type mentioned at the beginning (DE-PS 681 180) back and forth in such a manner that a supplied plush thread is placed above high or low sinker edges. As a result, a plush fabric with plush loops at different heights can be produced or a plush fabric which consists of a two-thread basic knitted fabric which is provided at selected points with plush loops projecting over the knitted fabric. The selection both of the needles and also the sinkers results thereby with the help of selection devices in the form of mechanically operating pattern drums. Sinkers and selection devices of this type are unsuitable for fast-running, multi-system circular knitting machines really because of the mechanical pattern drums requiring a lot of space. In addition, the pattern options are limited.
In addition, plush sinkers are known (DE 33 32 280 C2) to which electromagnetic selection devices are assigned and which thus make possible practically any shape of pattern. The control of sinkers is achieved with the help of sinker jacks which are arranged parallel to the axis of the needle cylinder and which are arranged in the same needle channels of the needle cylinder as the cylinder needles. The sinker jacks can thereby be moved upwards and downwards under the control of the selection devices, said sinker jacks co-operating during the upwards stroke with wedge surfaces mounted on the undersides of the sinkers and consequently causing radial movements of the sinkers to occur perpendicular to their own axial movements. Sinker control systems of this type are however associated with increased friction and thus are undesirable. It is also inconvenient that the sinker jacks are arranged in the needle cylinder channels and hence can impair not only the function of the cylinder needles but also impede the application of selection devices for the cylinder needle if such additional selection devices are desired.
It is, therefore, an object of this invention to design the sinkers and selection devices mentioned above such that they are particularly useful for the tight spatial conditions in a sinker ring.
A further object of the invention is to design the sinkers and selection devices such that they can be operated with high reliability also under tight spatial conditions.
Yet a further object of the invention is to design the sinkers and selection devices such that they can be operated with high reliability and yet at high knitting speeds.
These and other objections of this invention are solved by a sinker having a selection element which is provided with a controllable raising butt and is arranged in the recess at least partly and in such a manner that it is mounted rotatably or swivellably relative to the shaft and can be swivelled into at least a first position, in which the raising butt is retracted behind the front side, and a second position in which the raising butt projects upwards over the upper side, wherein a spring pre-tensions the selection element into one of the two positions.
The invention further provides a selection device on a circular knitting machine containing: a sinker ring, sinkers, according to this invention being mounted displaceably in said sinker ring, a sinker cam assembly with cam parts operating on butts of the sinkers and an electromagnetic selection member which is arranged in the area of the selection point to distribute the sinkers onto different paths in accordance with a pattern, wherein said sinker cam assembly has a depressing cam part which swivels the selection elements into a position pre-tensioning the springs and as a result makes anchor surfaces of the selection elements approach the selection member.
Further advantageous features of the invention are claimed in the sub-claims.
REFERENCES:
patent: 3362195 (1968-01-01), Goisis
patent: 4574596 (1986-03-01), Engelfried et al.
patent: 4584851 (1986-04-01), Plath
patent: 681 180 (1939-09-01), None
patent: 33 32 280 C2 (1985-12-01), None
patent: 0 712 952 (1996-05-01), None
patent: 0 752 490 (1997-01-01), None
patent: 1 477 890 (1977-06-01), None
patent: 2 242 692 (1991-10-01), None
patent: WO 97/34036 (1997-09-01), None
Falik Andy
Sipra Patententwicklungs u. Beteiligungsgesellschaft mbH
Striker Michael J.
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