Warp knitting loom, in particular crochet galloon machine

Details Warp knitting loom, in particular crochet galloon machine Warp knitting loom, in particular crochet galloon machine

2000-01-21

2001-02-06

Worrell, Danny (Department: 3741)

Textiles: knitting

United needle machines

Straight

C066S204000

Reexamination Certificate

active

06182476

ABSTRACT:

TECHNICAL FIELD
The invention relates to a warp knitting machine, especially a crochet galloon machine, according to the pre-characterizing clause of claim
1
.
PRIOR ART
Many warp knitting machines of the type mentioned in the introduction are known, as, for example, from WO 92/13127, in which guide bars can be driven individually by means of a summation gear, individual displacement elements having different degrees of displacement and being connected by means of coupling members to a regulating device which can be controlled according to the particular pattern. This drive is relatively complicated, and it is necessary to move relatively large masses which make the drive very sluggish and greatly limit the performance of warp knitting machines. Moreover, due to the number of displacement elements, intermediate elements and members for coupling to a pattern-related regulating device, the drive requires a considerable overall volume, this being a serious disadvantage because the guide bars have to be arranged near the knitting point and the space available for drive elements is greatly restricted correspondingly.
DE-A-21 19 053 discloses a device for shedding on weaving looms, in which the warp yarns are driven by means of a linear motor, drive members, which each move at least one warp yarn, being arranged in a common stator. It cannot be understood how such a linear motor could also be suitable for driving a guide bar of a warp knitting machine.
PRESENTATION OF THE INVENTION
The object of the invention is to improve further a warp knitting machine, especially a crochet galloon machine, of the type mentioned in the introduction.
The set object is achieved, according to the invention, by means of the characterizing features of claim
1
.
Since an electronically controllable linear motor has at least two drive members which are connected in each case to a guide bar and which are guided to and fro in a common stator by means of a closed magnetic circuit, there being present, moreover, for each drive member at least one drive coil which is connected to the control device and the plane of turn of which is oriented transversely to the magnetic flux direction, this results, for the guide bars, in an extremely small and nevertheless effective drive which, moreover, can be controlled in a simple way by means of an electronic control device, so that it is possible for the drive to have a hitherto unknown small design. Accordingly, the masses and frictional forces are extremely low and the electronic control is direct and effective, so that high drive speeds are possible, along with very low wear, the least possible generation of noise and the most minimal energy consumption. Moreover, a high degree of control flexibility for pattern purposes is achieved.
Advantageous embodiments of the invention are described in claims
2
to
11
.
In principle, it is possible to arrange the drive coil for driving the drive members on parts of the stator and to provide merely permanent magnets on the drive members. However, the embodiment according to claim
2
is more advantageous, since it allows a simpler, more effective and more individual control of the drive members.
The drive force can be increased if there is not only one drive coil present on the drive member, but two or more drive coils arranged one behind the other in the direction of movement.
An especially advantageous embodiment of the stator is described in claim
4
, the development according to claim
5
being especially preferred.
The magnets of the stator may be electrical exciting magnets, but they are preferably designed, according to claim
6
, as permanent magnets.
An embodiment according to claim
7
is especially advantageous, since it can then be seen which position the drive member assumes in each case, so that it is not necessary to operate with a constant stroke up against limit stops, but, instead, the control device can also instigate the position into which the drive member is to be moved. Particularly by means of the development of the warp knitting machine according to claim
8
, it is possible for the drive member to be controlled exactly as regards the magnitude of the displacement travel and the stopping position, with the result that optimum patterning of the warp knit fabric to be produced is possible.
In principle, it is conceivable for the drive member according to claim
10
to execute a curved to-and-fro movement, but the embodiment according to claim
9
is especially advantageous.
A development according to claim
11
is advantageous. The cooling device may, for example, be a suction blower which sucks away hot air and therefore also serves, at the same time, for cleaning the linear motor. However, more intensive cooling is achieved if the cooling device is designed for the supply of cooling air.


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patent: WO 81/01223 (1981-04-01), None
patent: WO 92/13127 (1992-08-01), None

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