Textiles: knitting – Feeding – Positive
Patent
1981-05-18
1983-06-07
Feldbaum, Ronald
Textiles: knitting
Feeding
Positive
66163, 66158, D04B 1548
Patent
active
043865089
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for selective positive feeding of a plurality of yarns to a horizontal striping knitting machine in accordance with the preamble of claim 1.
A known apparatus of this kind is disclosed in GB-A No. 2 035 389 (corresponding to West German application No. P 29 39 803.6, Italian application No. 26 235a/79, Japanese application No. 54-128415, South Korean application No. 34 08/79, Taiwanese application No. 6812220, U.S. Ser. No. 81,540 of 79). In this prior apparatus, when used in connection with a striping knitting machine, at least one electromagnet is associated with each yarn feeding device. The magnet is energized to bring the yarn associated with its yarn feeding device into its first position and de-energized to bring the yarn into its second, non-feeding position. Alternatively, two electromagnets can be associated with each yarn feeding device, one of them being energized for moving the yarn into its first position and the other to move it back into the second position. Thus, each set of yarn feeding devices included in one positive yarn feeding unit has either the same number of electromagnets or twice this number. In a striping knitting machine, a large number of positive yarn feeding units is required, which in turn calls for a far higher number of magnets. This makes the device not only mechanically complex, but requires a very complicated electrical or electro-mechanical control system for all the magnets. Thus, while the prior apparatus largely avoids the previous drawbacks of positive yarn feeding in striping machines, in particular overflow of yarn from the positive feeding devices and frequent yarn breakages, by controlling the positive yarn feeding devices in such a way that the yarns are disengaged from the positive feeding elements prior to their being taken out of the knitting position, it still has the disadvantage of mechanical and electrical complexity.
It is known, (e.g. from U.S. Pat. No. 3,950,966) to control the position of the yarn relative to the positive feeding elements of a yarn feeder by the degree of tension in the yarn. This is usually accomplished by using a spring-loaded, pivotable eyelet, which moves the yarn, when under no or low tension, to a position, in which no positive feed takes place, and which is pivoted by an increase in the yarn tension to a position in which the yarn is engaged by the positive yarn feeding element. By using this type of yarn control in connection with a yarn feeding system for striping knitting machines, it is not possible to move the yarns out of their positive feeding positions before they are taken out of their knitting positions. If, however, the yarns are at the same time taken out of their knitting positions and out of their positive feeding positions, the problems of overflow feeding and yarn breakage reoccur.
The task underlying this invention is to improve the apparatus of the type defined above to make it mechanically and, above all, in its electrical control, less complicated and more reliable.
This task is solved by the features of the characterizing portion of claim 1.
The apparatus according to the invention requires only one electromagnet for each set of positive feeding devices. Such a single magnet is mechanically very simple and, above all, easy to control electrically. The advantage of each yarn being disengaged from the positive feed before it is taken out of its knitting position is maintained. The return to the positive feed position is accomplished in a simple and known way by increase of tension. No problems are caused by simultaneously engaging the positive feed and returning the yarn to the knitting position. The apparatus according to the invention is inexpensive to manufacture and is small enough to be fitted on any striping machine. It is also easy to monitor.
Claim 2 is directed to a mechanically simple uni-directional connection between the magnet and the yarn control elements.
Claim 3 covers a further advantageous detail of said connection.
Claims 4 and 5 are directed to a s
REFERENCES:
patent: 3418831 (1968-12-01), Nance
patent: 4137731 (1979-02-01), Jacobsson
patent: 4259851 (1981-04-01), Jacobsson
patent: 4259851 (1981-04-01), Jacobsson
Aktiebolaget IRO
Feldbaum Ronald
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