Textiles: knitting – Feeding – Positive
Patent
1982-09-07
1985-07-30
Reynolds, Wm. Carter
Textiles: knitting
Feeding
Positive
66140R, 66144, 242 4701, D04B 1548, D04B 1560, D04B 1562
Patent
active
045313857
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method for feeding yarns of different colours from yarn supplies through a positive feeding device and a yarn selection unit to a knitting machine for producing striped fabrics.
BACKGROUND OF THE INVENTION
It is known to place the positive feeding devices between the yarn supply packages and the yarn selection unit. The latter unit is directly associated with the knitting machine, which is thus equipped with a number of yarn selection units corresponding to the number of knitting systems. A separate positive yarn feeding element is required for each yarn. This makes the knitting machine and its feeding system complicated. A major problem of these knitting machines specifically designed for the production of striped fabrics is that bulky equipment must be installed immediately adjacent the knitting system, thus making the machine difficult to assemble, to repair and to adjust.
The technical problem underlying this invention is to devise a method of the above-outlined type which permits of feeding of yarns of different colours to a conventional knitting machine, thus enabling a simple knitting machine to produce striped fabrics.
This problem is solved by the invention in that for feeding the yarns to a conventional knitting machine having no selection units immediately associated with its knitting systems, an unbroken yarn consisting of portions of different colours is formed for and fed into each knitting system of the machine by the following steps: cycle of the machine and in dependence on the desired striping pattern a yarn of the desired colour is selected, yarn travelling into the knitting machine, of the selection unit, and knitting system, the lengths of unbroken yarn being controlled in accordance with the desired striping pattern.
By use of the method according to the invention it is possible to produce striped fabrics on a conventional knitting machine with relatively simple additional equipment, which can be located at a certain distance above or outside of the knitting machine itself. The feeding system is also simpler than in known cases, because only one unbroken yarn has to be fed to each knitting system.
The control of the length of unbroken yarns running into each knitting system preferably starts at the joining station. This enables the control to place the joints of the yarn ends, which are normally knots, at a specific location in the fabric where they do not disturb the overall appearance, e.g. at the location where the fabric is later severed.
The invention also relates to a knitting machine for producing striped fabrics from yarns of different colours stored in yarn supplies, selected by a selection unit and fed to the knitting systems of the machine by a positive feeding device.
As outlined above, known knitting machines of this type are specifically designed for the production of striped fabrics and are rather complicated and bulky.
The invention provides a simpler production unit for striped fabrics and is characterised in that the knitting machine is a conventional knitting machine having no selection units immediately associated with its knitting systems, that a yarn selection unit controlled in synchronism with the working cycle of the knitting machine and in dependence on the desired striping pattern is provided separate from each knitting system, that a yarn knotting, clamping and cutting device is associated with each yarn selection unit, that an intermediate yarn storage device is provided downstream of the knotting, clamping and cutting device, and that a positive yarn feeding device is provided downstream of the intermediate yarn storage device.
Preferably, the intermediate yarn storage device consists of a stationary drum and a winding-on element provided with a winding drive. In this way, the additional twist on the unbroken yarn is kept at a minimum. It would, however, also be possible to use a rotating intermediate storage drum.
Preferably, the positive yarn feeding device is a tape feeder. Such a tape feeder can fe
REFERENCES:
patent: 1726396 (1929-08-01), Larkin
patent: 2232616 (1941-02-01), Larkin
patent: 4116393 (1978-09-01), Inouye et al.
patent: 4199965 (1980-04-01), Wilson
patent: 4298172 (1981-11-01), Hellstrom
Aktiebolaget IRO
Reynolds Wm. Carter
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