Textiles: weaving – Special-type looms – Pushed shed pocket
Patent
1997-12-02
1999-08-17
Falik, Andy
Textiles: weaving
Special-type looms
Pushed shed pocket
1394351, 139450, D03D 4700
Patent
active
059379138
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method for the operation of a weft thread distributor apparatus of a series shed weaving machine comprising a supply nozzle and an injector nozzle which blow a weft thread contrary to the direction of rotation of the weaving rotor into a connection channel between a spatially fixed ring part and a weaving rotor, with the weft thread being deflected out of the connection channel into a shoot-in tube and, after its insertion in the direction of insertion, being clamped and cut off behind the shoot-in tube when viewed in the direction of insertion in order to suck back a new weft thread tip which has arisen in this way and to blow it contrary to the direction of rotation of the weaving rotor into a further shoot-in tube.
2. Description of the Prior Art
An apparatus of this kind is described in EP-A-0 433 216.
A further similar apparatus is described in EP-B-0 143 860. This is, in particular, the part of the apparatus which is described on page 3, from lines 7 to 19.
Experiments with such weft thread distributor apparatuses have shown that it is not at all simple to hold a weft thread inserted into the weaving rotor in such a manner that it is uninfluenced by the cutting process and, on the other hand, to perform the cutting procedure for each new weft thread tip with a high accuracy of repetition.
SUMMARY OF THE INVENTION
The object of the present invention is thus to show a reliable method for an exact cutting to length of the new weft thread tip and for a trouble-free rerouting of this weft thread tip. This object is satisfied in that, when viewed in the direction of insertion, first a cutting device and then a clamping device is spatially arranged at the shoot-in tube; and in that, when considered temporally, a retracting force is already generated in the connection channel prior to the clamping of the weft thread which assists the braking in the clamping device and prevents the formation of a loop between the shoot-in tube and the clamping device during the cutting.
This sequence has the advantage that the weft thread is pre-braked and tensioned towards the end of its entry into the shed and does not continue moving toward the clamping device after its mechanical clamping in the clamping device. The actual stop-stroke is produced and taken up by the clamping device, whereas the retraction force is so great that it prevents the continued motion of the low thread mass between the connection channel and the clamping device in order to enable a cutting of the weft thread in the tensioned state.
The transition of the weft thread tip from the connection channel into the shoot-in tube through an inclined stripper shoulder which forms an obtuse angle with a partition plane to the spatially fixed ring part proceeds without difficulty. Thus, in the development of the connection channel there exists only a small partition gap to the spatially fixed ring part in the region of the stripper shoulder, whereas along the remaining periphery there is a cut-out groove on the rotor side which is cut out to a depth such that a minimum flow can be established contrary to the direction of rotation in the region of influence of the supply nozzle and the injector nozzle. On rerouting the new weft thread tip, it can be advantageous if additional nozzles are built into the spatially fixed ring outside of a pocket of the connection channel contrary to the direction of rotation which blow into the cut-out groove contrary to the direction of rotation at a desired point in time.
The precision of the cutting to length also depends on the repetition accuracy on actuating the injector nozzles and the possibly present additional nozzles. It is thus advantageous to produce the air pulses by an open control chain and kinematic correlation of the control valves with the rotational motion of the weaving rotor. Since several weft threads must be braked, cut under bias tension and rerouted one after the other, a rotary gate which distributes the air pulses one a
REFERENCES:
patent: 4592393 (1986-06-01), Steiner
patent: 5146955 (1992-09-01), Steiner et al.
patent: 5406985 (1995-04-01), Christe
patent: 5437313 (1995-08-01), Christe
patent: 5439037 (1995-08-01), Christe
Falik Andy
Sulzer Rueti AG
LandOfFree
Weft thread distributor apparatus of a series shed weaving machi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Weft thread distributor apparatus of a series shed weaving machi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Weft thread distributor apparatus of a series shed weaving machi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-305317