Textiles: knitting – Feeding – Additional strand idled guide
Reexamination Certificate
2000-03-27
2001-02-20
Worrell, Danny (Department: 3741)
Textiles: knitting
Feeding
Additional strand idled guide
C066S14000R
Reexamination Certificate
active
06189345
ABSTRACT:
FIELD OF THE INVENTION
The present invention pertains to the field of circular stocking knitting and knitting machines and pertains, in particular, to a device for locking yarns, especially elastic yams, which are removed from time to time in the course of a cycle of manufacturing a knitted article on such machines.
BACKGROUND OF THE INVENTION
Stocking knitting and knitting machines are usually provided with a cutting unit. This unit is intended to cut the yarn or yarns when they must be removed from the knitting though maintaining them in a position to be picked up again by the needles with an appropriate movement of the yarn guides and subsequently knitted. Also associated with the cutting unit are devices for locking the adjacent yarns by pneumatic openings to hold back the yarns proper until they will be taken up again by the needles.
One problem with the prior-art yarn-locking devices is that they do not effectively hold back the yarns, especially if they are elastic yarns; therefore, they tend to easily miss even the pneumatic openings. Another problem of the prior-art yarn-locking devices is that they do not always ensure that the yarns removed from the knitting will maintain a suitable position for their certain picking up again by the needles.
SUMMARY AND OBJECTS OF THE INVENTION
The principal object of the present invention is to provide the means to effectively solve the problems mentioned above, thus ensuring the locking even of elastic yams in the position of not knitting and/or arranging these yarns with such an orientation that they may be easily picked up again by the needles.
Another object of the present invention is to provide a yarn-locking device that is adaptable and may also be used as a yam-cutting device in addition to the usual cutting unit present in circular knitting machines.
According to the invention, a yarn-locking/cutting device is provided for circular stocking knitting machines that have knitting needles, yarn guides for supplying the yarns to the needles and can be moved from a position of knitting to a position of not knitting. The invention also provides a cutting unit for taking and cutting the yarns when they are removed from the knitting. Two elements are provided, one fixed (the fixed element) and the other oscillating (the oscillating element), interacting by way of pliers or scissors, hanging from a support that is arranged stationarily in a zone contained between the yarn guides and the cutting unit. The elements are inclined in the direction of rotation of the machine.
The fixed element may comprise a fixed plate which hangs from the support and which has a back side turned towards the outside of the machine. The oscillating element may comprise a locking lever, which can be moved on an oscillation pin between an inactive position, at a distance from the outer back side of the fixed plate, and an active position adjacent to the outer back side of the fixed plate. The oscillating lever may have at least one capture means for capturing the yarn and pulling and locking same towards and against the back side of the fixed plate in response to a command to exit the knitting and cut the yarn proper.
The oscillating lever may have a mouth with a notch for capturing and pulling the yarn, with the notch being turned towards the fixed plate. The oscillating lever has an angular part which extends from the lever to the fixed plate and which forms, with a lower side and a plane for supporting and allowing the yarn to slid. The supporting plane may be just above the notch for capturing and pulling the yarn.
The oscillating lever may be maintained usually in the active position by a spring connected thereto. The oscillating lever is moved into the inactive position by a pneumatic actuator acting on the lever in opposition to the spring.
The fixed and oscillating elements preferably have a sharp side for cutting the yarn when the two elements are drawn into the active position.
The device can preferably be used for positioning the yarn in relation to the knitting members by means of a controlled movement of the sole oscillating element.
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:
patent: 3598158 (1971-08-01), Hall
patent: 3803878 (1974-04-01), Lonati
patent: 4967575 (1990-11-01), Fucik et al.
patent: 5070709 (1991-12-01), Guell
patent: 6000245 (1999-12-01), Plath et al.
McGlew and Tuttle , P.C.
Sangiacomo S.p.A.
Worrell Danny
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