Textiles: knitting – Needle cooperating elements – Pile loop formers
Reexamination Certificate
2001-02-21
2001-11-27
Worrell, Danny (Department: 3765)
Textiles: knitting
Needle cooperating elements
Pile loop formers
C066S10800R, C066S107000
Reexamination Certificate
active
06321575
ABSTRACT:
FIELD OF THE INVENTION
The present invention pertains to circular knitting machines and stocking knitting machines for terry cloth knitting, and it pertains specifically to a system of cams and a sinker for terry cloth knitting on such machines.
BACKGROUND OF THE INVENTION
One of the methods for terry cloth knitting on circular knitting machines and stocking knitting machines provides for the use, in combination, of vertical needles on the cylinder and terry cloth sinkers arranged horizontally on a ring of sinkers that lies above the cylinder and rotates with same. The terry cloth stitch is usually produced by at least two yarns fed in such a way that a first yarn contributes to the formation of a basic stitch, while the other yarn is used to form oblong terry cloth loops on the terry cloth sinkers.
To this end, each sinker usually has a plane for the formation of the basic stitch and at least one mouth, which lies above this plane and is intended to receive the yarn for the formation of terry cloth loops or curls.
The operating movements of the sinkers in relation to the needles for the collection of yarns on the stitch formation plane and on the mouth for formation of terry cloth loops are controlled by inlet and outlet cams with their own prearranged profile. However, the cams, on the one hand, and the sinkers, on the other hand, as they are currently configured, do not make it possible to use these sinkers for plain and terry cloth knitting or the production of manufactured articles that have plain stitch parts and terry cloth stitch parts. To carry out this type of knitting using the cams available, it is necessary to remove the upper mouth of the sinkers that must produce only the plain stitch or simply to replace the terry sloth sinkers with plain stitch sinkers corresponding to the non-terry cloth parts within the framework of a manufactured article.
SUMMARY AND OBJECTS OF THE INVENTION
One object of the present invention is to create the conditions for always advantageously being able to use the same sinkers in association with the needles on the cylinder for the production either of a terry cloth stitch or of a plain stitch, therefore without having to substitute the sinkers or to change their structure by means of removing the mouth for the terry cloth.
Another object of the present invention is to provide a sinker that can be selectively used for the production both of a terry cloth stitch and of a plain stitch or terry cloth means according to the knitting requirements of a manufactured article.
A further object of the present invention is to provide improved cam means for a selective control of the sinkers that must produce a terry cloth stitch by the said sinkers that must knit a plain stitch, the cam means including movable parts that can be moved between an inactive position and an active position.
According to the invention, a system of cams and a sinker for terry cloth knitting with needles on circular knitting machines and stocking knitting machines is provided. The sinker has a shaft with a control bottom part and a head having a horizontal plain stitch formation plane, a top mouth for the formation of terry cloth loops, an intermediate mouth delimiting with the top mouth a notch for the formation of a mixed plain stitch, and a rear shoulder which is turned towards the bottom part and is perpendicular to the shaft. The cam device is intended to selectively interact with the control bottom part and with the shoulder for differentiated inlet and outlet longitudinal movements of each sinker in relation to the needles for a selective formation of a plain stitch at the said horizontal plane, a terry cloth stitch at the top mouth and a mixed stitch at the notch of the sinker itself.
The cams may comprise a fixed cam track which is provided for acting against the shoulder for an inlet of the sinker for the formation of a plain stitch on the horizontal plane, at least a first movable lever arranged on the outside of the said fixed cam track and movable between an inactive position and an active position for acting against the control bottom part for an inlet of the sinker for the formation of a terry cloth stitch on the said top mouth, and at least a second movable lever, which can be moved between an inactive position and an active position for acting against the said shoulder or against the control bottom part of the sinker for an inlet of same for the formation of a mixed plain stitch in the intermediate notch. Such a second movable lever or the second movable levers can be moved between the inactive and active positions by a rotating cam ring.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which a preferred embodiment of the invention is illustrated.
REFERENCES:
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patent: 4519221 (1985-05-01), Hirano
patent: 4955211 (1990-09-01), Neher
patent: 4986090 (1991-01-01), Lombardi
patent: 4989421 (1991-02-01), Schmidt
patent: 5477707 (1995-12-01), Renda et al.
patent: 5511393 (1996-04-01), Hu
patent: 6089047 (2000-07-01), Wang
McGlew and Tuttle , P.C.
Sangiacomo S.p.A.
Worrell Danny
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