Warp knitting machine

Details Warp knitting machine Warp knitting machine

1987-01-27

1988-04-12

Feldbaum, Ronald

Textiles: knitting

United needle machines

Straight

D04B 2710

Patent

active

047366028

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a warp knitting machine in which the knitting elements and each warp beam are driven by their own electric motors, powered from a common network.
Such a drive for a warp knitting machine is described in German Pat. No. 30 25 782. That patent publication points out that when a power failure occurs in the network, the main shaft of the machine and the parts connected with it come to a standstill only after a certain delay, because of their mass, while the drive of the warp beam or the drives of the warp beams are stopped relatively quickly. This means that all of the warp yarns of all of the warp beams can break. To eliminate this danger, the cited patent publication describes a switching mechanism in which the main shaft of the machine is equipped with an electrically controlled brake which moves from its disengaged position to its braking position under the influence of a stored braking force. This results in the main shaft coming to a stand-still in much less time, almost jerkily, so that breaking of the warp yarns is avoided. Because of the considerable masses involved with the main shaft, this almost jerky braking of the main shaft imparts great stresses upon the machine parts, and this, in turn, can lead to internal shifting in the machine and even to damage. The patent publication also discusses this stressing of the machine, specifically by indicating an additional switch to disengage the above-described brake in case of a normal shut-down process, so that the almost jerky stopping of the main shaft is avoided in this normal procedure. It is, however, impossible to eliminate the stress to the machine which results in case of network power failure.
It should also be noted here that U.S. Pat. No. 2,625,021 discloses an electrically engaged clutch in connection with a warp knitting machine wherein the force which drives the warp beam is derived from the main shaft. Here, the setting of a more or less powerful slaving force via the clutch ensures the maintenance of thread tension at its normal level by imparting more or less powerful driving force to the warp beam when yarn tension is altered.


SUMMARY OF THE INVENTION

It is an object of the instant invention to remove the danger of breakage to which the warp yarns are exposed when a power failure occurs in the network, without subjecting the machine to significant stresses. This is achieved according to the invention by installing an electrically engaged clutch connected to the drive between each warp beam and its electric motor, said clutch being connected to the power network and being engaged by the network current and disengaged when said network current fails.
This clutch is disengaged when a power failure occurs in the network. The interruption of the drive connection between the electric motor and the warp beam eliminates the danger of warp yarns breaking, since the warp beam or beams can continue rotating without difficulty as a result of the traction exerted on them by the knitting elements until said knitting elements are, in turn, stopped when the main shaft stops. In this case, the main shaft can slow down under the effect of its moment of inertia, so that said main shaft and the structural elements to which it is connected are not submitted to any significant stresses. This drive method has been proven through experience to be entirely without danger for the warp yarns because the warp beam is already rotating at this stage of the operation. The friction forces to which it is subjected are always kept as low as possible thanks to its bearing supports, so that the warp yarns still being pulled by the knitting elements can easily rotate the warp beam. This friction can also be entirely desirable, especially if the warp beam is out of balance, since it counters the tendency of said warp beam to continue its rotation because of this imbalance.
Another considerable advantage of interrupting the drive connection between the electric motor and the warp beam resides in the fact that knitting e

REFERENCES:
patent: 2625021 (1953-01-01), Schoenster
patent: 3762346 (1973-10-01), Cobble
patent: 4387579 (1983-06-01), Branke et al.
patent: 4628967 (1986-12-01), sterle

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