Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1985-03-22
1987-03-03
Jaudon, Henry S.
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
D03D 4734
Patent
active
046467920
DESCRIPTION:
BRIEF SUMMARY
The invention is directed to a device for supply and regulation of a thread for a textile machine, in particular a loom.
Devices of the previously mentioned type are variously known, as for instance from the DE-OS 30 01 069. The thread control devices described there comprise a spring clip containing a thread guidance loop, which in a first position releases a thread and in a second position introduces same into a clamping device consisting of an elastic element, which forms a tapering gap together with a fixed machine part. Thereby it is very disadvantageous, that the thread clamped in the tapering gap can be damaged at the beginning of the thread conveyance both during the clamping, as during the loosening through the chafing of the thread in the gap. Apart from that an increased initial effort is required for the loosening of the thread in the clamping device, which leads to a jerky release of the thread from the clamping device, whereby extreme tensile fluctuations arise in the thread, which on the one side can influence the uniformity of the textile product to be fabricated in a damaging fashion or can even lead to rupture of the thread. These disadvantages are in part avoided by means of a further embodiment form of the device according to the DE-OS No. 30 01 069, in which the thread control device comprises a thread guidance loop arranged on a lever, which is mechanically connected to a displaceable brake shoe, which coacts with a fixed brake shoe. The thread is guided in between the brake shoes. In a first position the brake shoe releases the thread conveyance and in a second position it tightly clamps the thread. With this device damage to the thread during clamping and loosening is avoided, however the device is relatively complicated and it is impossible to avoid a starting run of the thread without jerks. Apart from that the device for both embodiment examples shows a thread clamping device, which is located in front of the thread conveyance roller.
It is a task of the invention to create a device of the previously described type in such a manner, that on the one hand a jerkless thread conveyance is possible and on the other hand the device has a simple construction.
The defined task is solved by the present invention. Since in the inventive case the thread control device effectuates the conveying of the thread exclusively on the basis of the position of the thread guidance loop and the frictional behavior in the thread control device or at the thread conveyance roller, it is possible to do without active thread brake devices and the thread control device can be located directly behind the thread conveyance roller. This results in a considerably simplified construction of the device. Over and above that this design makes possible in particular a very smooth control of the thread conveyance, which directly adjusts to the requirements and where no tensile fluctuations occur, as they would be caused by the additional active braking device. Thus a thread conveyance results which adjusts optimally to the requirements of the loom. Additionally, it is possible by means of the two loops, which are formed over the fixed thread guidance and the two thread guidance loops, to form a larger thread reserve in the smallest space. Finally, this design makes possible in a simple manner the arrangement of additional fixed thread guides, whereby the frictional resistance can be further changed.
Of advantage is also an embodiment additional fixed thread guidance or thread guidance loop, which becomes operative in the second position of the displaceable thread guidance loop, however not in the first position, an additional frictional resistance can be generated, which is desirable in the second position of the thread guidance loop. In the first position of the thread loop, in which the thread must be conveyed, this additional frictional resistance does not appear.
If the guidance loop is not sufficient in order to interrupt the thread conveyance at the thread conveyance roller in the second position, a second threa
REFERENCES:
patent: 3194276 (1965-07-01), Krukonis
patent: 3460584 (1969-08-01), Mosher
Speich Francisco
Villa Carlo
Jaudon Henry S.
Textilma AG
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