Textiles: knitting – Feeding – Positive
Patent
1991-02-05
1993-02-09
Falik, Andrew M.
Textiles: knitting
Feeding
Positive
66125R, 242 4701, 242 4712, D04B 1548
Patent
active
051844842
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a yarn feeding apparatus for a knitting machine and, more particularly, to a yarn feeding apparatus which, in response to abnormal tension on the yarn, allows a yarn loop wound on a storage drum to be unwound, and then halts operation of the machine, whereby the yarn will not break, and thus yarn feeding can be readily resumed.
BACKGROUND ART
In general, a knitting machine includes a number of yarn feeding apparatuses corresponding to the number of bobbins in order to feed each yarn as it is unwound from each bobbin to knitting needles within the interior of the knitting machine. An example of such a yarn feeding apparatus is disclosed in Korean Patent Publication No. 86-1053. Such apparatus has a storage drum equipped with a driving wheel driven by an endless tape. A number of conical surfaces are provided coaxially with each other at the upper and lower portions of a holder. Winding and unwinding is simultaneously executed to wind each yarn a predetermined number of turns around a storage drum.
In such an apparatus, the yarn arranged on the storage drum smoothly feeds yarn to the interior of the knitting machine. However, since an operator winds the yarn one-by-one on the storage drum to form each yarn loop, not only is the work cumbersome, but it also causes feeding tension differences in each yarn where the number of turns of yarn formed on each storage drum are different from each other.
In presently known and used yarn feeding apparatus, when abnormal tension is imparted to the yarn which is being unwound from the bobbin due to any defect in the bobbin itself, there is no mechanism capable of absorbing the increased tension. Therefore, the yarn will often break easily.
Further, when it is desired to change over from a positive type feeding to a free feeding to accommodate a switch in textile structure, generally, either a driving belt wound on the driving wheel is manually removed, or a locking device mounted on each driving wheel is handled one-by-one to allow the storage drum to be freely rotated. However, since these changeover processes are cumbersome and difficult to automate, there has been a problem that productivity is reduced.
SUMMARY OF THE INVENTION
Therefore, the present invention provides a yarn feeding apparatus for a knitting machine in which a rotary cap driven by a motor is provided on an upper part of a storage drum. The structure is such that, when an abnormal tension is imparted to the yarn fed thereto, the yarn loop wound on the storage drum unwinds, and, simultaneously, the driving of the machine is stopped, so that the yarn feeding can be executed without breaking or disconnecting the yarn.
The present invention also provides a yarn feeding apparatus for a knitting machine in which an idle pulley is provided adjacent to the bottom of a driving wheel. A shifting mechanism for shifting a driving belt to either the driving wheel or the idle pulley is provided at one side. The shifting mechanism serves to change the yarn feeding condition between positive feeding or free feeding under motor control.
According to one embodiment of the present invention, a hollow shaft is fixed at the central portion of the base of a hollow holder The holder is equipped with a clamper at a side of the holder. A driving wheel equipped integrally with a storage drum above it is rotatably mounted via a bearing to the hollow shaft. A cylindrical mounting member is attached to the top end of the hollow shaft to support a motor in the interior of the mounting member, whereby it is located at the inside of the storage drum. A hollow threaded tube formed with female threads on the internal circumferential surface is fixed on the upper surface of the motor, and a coupling member having a rectangular section is fixed to the rotary shaft of the motor. A movable threaded tube formed with male thread on the external circumferential surface thereof and having a rectangular groove to be coupled with the coupling member fixed to the rotary shaft of the motor is
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patent: 4754936 (1988-07-01), Dalmau Guell et al.
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Calvert John J.
Falik Andrew M.
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