EP0828879B1 - Weft thread distributor in a shed course loom - Google Patents

Description

The invention relates to a method for operating a Weft distributing device of a row shed weaving machine with a feed nozzle and with an injector nozzle a weft against the direction of rotation Webrotors in a connecting channel between one Blow in the stationary ring part and a weaving rotor, whereby the weft from the connecting channel into one Gun tube is deflected and after its entry in Entry direction seen behind the shooting tube is clamped and cut to create a result to suck back the new weft thread tip and against the Direction of rotation of the weaving rotor in another shooting tube to blow.

Such a device is in EP-A-0 433 216 described.

Another similar device is in the EP-B-0 143 860. It is in particular around the part of the device that is on page 3, line 7 to 19 is described.

Experiments with such weft distributing devices have shown that it’s not that easy to find someone in To keep the weft rotor inserted in the compartment so that it is unaffected by the cutting process, and on the other hand, the cutting process for each new one Weft thread tip with great repeatability perform.

It is therefore an object of the present invention reliable method for precise cutting of the new weft thread tip and for a trouble-free To show reversal of this weft tip. This Task is accomplished in that way seen first one spatially at the shooting tube Cutting device and then one Clamping device is arranged and that temporally seen one before pinching the weft Retraction force is generated in the connecting channel, which Braking in the clamping device supports and during cutting between loops Shot tube and clamping device prevented.

This procedure has the advantage that the weft is against Is braked and tensioned in the compartment at the end of the run-in and after its mechanical clamping in the Clamping device no longer to the clamping device runs after. The actual stop blow is through the Clamping device generated and intercepted during the Retraction force is so great that it runs after the low thread mass between the connecting channel and Clamping device prevents cutting the To allow weft in tensioned condition.

Advantageous further developments of the device for Implementation of the method are in claims 2 to 6 shown. So it has been shown that the transition the weft thread tip from the connecting channel into the Shotgun through a sloping scraper shoulder, the an obtuse angle with a parting plane to the fixed one Ring part forms, done easily. In process the connection channel therefore only exists in the area of Scraper shoulder of a small separating gap for stationary Ring part, while on the remaining circumference one incised groove on the rotor side, which is so is deeply incised that in the sphere of influence of Feed nozzle and injector nozzle counter a minimum flow the direction of rotation can be generated. When reversing the new weft tip it may be beneficial if against the direction of rotation additional nozzles outside one Pocket of the connecting channel installed in the fixed ring are at a desired time against the Blow the direction of rotation into the cut groove.

The accuracy of the cropping also depends on the Repeat accuracy when driving the injector nozzles and any additional nozzles. It is therefore advantageous the air impulses through an open timing chain and Kinematic connection of the control valves with the To generate rotary motion of the weaving rotor. Because several Weft threads braked one after the other, under tension must be cut and redirected is a Rotary vane, which the air impulses one after the other assigns the relevant weft nozzles, a particularly inexpensive and accurate solution. Thereby, that an element with little scatter in its Opening and closing characteristics of all injector nozzles or all additional nozzles are controlled Repeat accuracy high. In addition, by adjusting on this one element, the impulse for everyone on it connected nozzles are changed.

Furthermore, the invention is based on a Embodiment shown.

Figures 1 to 4 each show schematically one developed cut across the parting plane between Weaving rotor and stationary ring part and each along the Connection channel for a weft thread, being schematic the process for reversing a weft is shown.

Fig. 5 shows a kinematic via gears with a Webrotor connected rotary valve, the different Can feed injector nozzles in succession in one cycle.

The figures are one Weft distributing device for one Row shed weaving machine, in which a weft thread in fed a connection channel via a feed nozzle and within the connection channel Gun tubes are distributed. To be trouble-free Cutting the registered shot and reversing the Reaching a new weft tip is one Cutting device spatially between the shooting tube and Clamping device arranged so that before stopping the weft through the clamping device already a retraction force by means of the feed nozzle and injector nozzle and a loop under this retraction force be formed. While stopping in the Clamping device is the thread in the cutting device preloaded and can be cut easily. The Loop stretches and a new weft thread tip is entered in the next shot tube.

A takeover ring 20 connected to the weaving rotor 8 turns in direction of rotation 7 and turns in with little play a parting plane 13 to a stationary ring part 11. The connecting channel arranged on a certain radius 3 is through a pocket 21 in the fixed ring part 11 and through a cut groove 14 in the take-over part 20 educated. Only in the area of scraper shoulders 10 the gutter 14 interrupted. A weft thread 9 is used constant speed via a feed nozzle 1 delivered and at an acute angle against the Direction of rotation 7 of the takeover ring 20 in the Blown in connection duct 3. To reinforce the Blow action is an injector nozzle 2 coaxial with the Feed nozzle 1 is provided. Contrary to the direction of rotation 7 in the fixed ring part 11 behind the pocket 21 a Additional nozzle 16 attached opposite to the direction of rotation can blow into the rotating channel 14 to the Transport of the weft thread during reversing support. Steer at the transfer ring 20 each Scraper shoulders 10 the airflow and the weft 9 into the shooting tubes 4, of which the weft past a clamping device 6, 6 'into a row compartment the web rotor is transported. Before the Scraper shoulder 10, the groove 14 is excluded deeper and provided at their bottom with relief openings 18, to redirect airflow and weft into that Shooting tube 4 'to facilitate. The pull of the Additional nozzle 16 is only really effective when the deeper Part of the channel 14 in the area of the pocket 21 moved in and a continuously large cross section in the Connection channel 3 is formed (Fig. 3).

In Figure 1, the weft 9 runs freely from the Feed nozzle 1 against the direction of rotation 7 in the Connection channel 3 and further into the shooting tube 4 and a row compartment, not shown. The open one Clamping device 6 is shown as rotating, while the cutter is shown as stationary is. The deflection into the shot tube is along the stripping shoulder 10, which has an obtuse angle 12 (Fig. 3) to the parting plane 13 forms. At the end of the pocket 21 is the connection channel except for the little exempt Part of the channel 14 closed so that the Main air flow goes through the shooting tube 4.

In Figure 2, the weaving rotor 8 has the takeover ring 20 noticeably on the open cutting device 5 moved to. The additional nozzle 16 can be operated to to generate a negative pressure in the region of a slope 22, which supports the reversal when the larger one Cross section in the connecting channel 3 (Fig. 3). Feed nozzle 1 and injector nozzle 2, if the latter already is pressed, still blow against the slope of the blunt Angle 12 of the scraper shoulder.

With the transition to Figure 3, the edge of the Scraper shoulder 10 from the air jet from feed nozzle 1 and injector nozzle 2 moved out. At the same time the connection channel 3 to the additional nozzle 16 opened, see above that a continuous flow into the shooting pipe 4 ' arises and there is a loop 19 in the direction of this Forms flow at which a retraction force 15th occurs. This retraction force 15 has a braking effect on the Weft 9 in the insertion tube 4. If that now Stopping the weft thread 9 with the clamping device 6 takes place, the retraction force 15 is sufficient to short piece of thread up to the clamping device 6 under Maintain pre-tension and a thread loop in the area to prevent the cutting device. It can cut and the newly created weft tip 17 retracted into the connecting channel 3 until the loop 19 is extended against the direction of rotation 7 and the new shot is fired into the shooting tube 4 'and further into a new, not shown row subject entered.

This new weft insertion is indicated in FIG. It only the cutting device 5 still has to be open stand to achieve the state of Figure 1 while the clamping device 6 can open to To allow the registered shot to strike.

To at the right moment with the help of Injector nozzles 2 have a retraction force 15 before cutting of the weft thread, each injector nozzle 2 at a certain angle of rotation of the edge of the Scraper shoulders 10 a precisely defined air pulse receive. A rotary valve rotating in one direction 23, 30 pressure pulses in from a compressed air supply line Impulse lines 31 to the various injector nozzles conducts and simultaneously with the weaving rotor on which the Stripping shoulders 10 sit, kinematically e.g. about Gear wheels is coupled is shown in Figure 5. Of the Rotary valve 23 is with its housing base 24 on the Side wall 29 of a row shed weaving machine attached so that his drive gear 32 with a gear 33 of the Web rotor is engaged. Via housing seals 27, 28 are a central part 25 and a bearing bracket trained cover 26 with the housing bottom 24 over Connections 45 connected. There is a shaft in the cover 26 34 mounted by means of bearings 37 and axially with a spacer sleeve 38 and securing elements 39 secured. On the The drive side is the gear 32 with a nut 35 attached. Inside the housing 24, 25 is on the Shaft 34 a plastic disk 40 with a pin 42 attached, the washer 40 sealingly on the central part 25 is present. The disc has an opening 41, the while rotating on a circle behind it individually arranged at regular intervals Recesses 43 in the middle part 25 sweep and each for the period of the breakthrough of breakthrough 41 and Recesses 43 generates an air pulse. The number of Recesses 43 corresponds to the number of injector nozzles 2 in stationary ring part 11 (Fig. 3). The air pulse is in the Middle part 25 via radial channels 44 to the respective Impulse lines continued, for which only those Connection bores 31 are shown. If the Impulse lines are also of the same length, then the air impulses come in the same way and with a high rate Precision at the scheduled time for the Injector nozzles 2 on. Through the direct drive via the Webrotor are the impulses even with speed changes and correctly synchronized when starting. In the further the simple mechanics are characterized by a high Operational reliability over long time intervals. One Overuse of the friction points and one Enlargement of the sealing gap between disc 40 and The middle part 25 can be prevented if the disk 40 with a dosed axial force, for example different pressures on the Front and the rear friction side applied is. To adjust the start of the pulse, only the Nut 35 be loosened and the gear 32 against the Adjustment surfaces 36 slightly rotated on the shaft 34 become.

Claims (6)

1. Method of operating a weft thread distributor apparatus of a series shed weaving machine comprising a supply nozzle (1) and an injector nozzle (2) which blows a weft thread (9) contrary to the direction of rotation (7) of a weaving rotor (8) into a connection channel (3) between a spatially fixed ring part (11) and a weaving rotor (8), with the weft thread being deflected out of the connection channel (3) into a shoot-in tube (4) and after its insertion being clamped and cut off behind the shoot-in tube (4) 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 (7) of the weaving rotor (8) into a further shoot-in tube (4'), characterised in that, when viewed in the direction of insertion, first a cutting device (5) and then a clamping device (6) are arranged spatially following the shoot-in tube (4); and in that,when viewed time-wise, a retraction force (15) is already present in the connection channel (3) prior to the clamping of the weft thread (9) and assists the braking in the clamping device (6) and prevents the formation of a loop between the shoot-in tube (4) and the clamping device during the cutting.
2. Apparatus for carrying out the method of claim 1 characterised in that the transition from the connection channel (3) into the shoot-in tube (4) takes place via an inclined stripper shoulder (10) which forms an obtuse angle (12) with a partition plane (13) between the spatially fixed ring (11) and the weaving rotor (8).
3. Apparatus for carrying out the method of claim 1 characterised in that the connection channel (3) is cut into both sides of the partition plane (13) in the spatially fixed ring (11) and in the weaving rotor (8), with a cut out groove (14) being present in the weaving rotor over the entire periphery with the exception of the region of the stripper shoulders (10).
4. Apparatus in accordance with one of the claims 2 or 3 characterised in that at least one further additional nozzle (16) is arranged in the spatially fixed ring outside of a pocket (21) from the connection channel (3) and opposite to the direction of rotation (7) and likewise blows into the cut out groove (14) contrary to the direction of rotation (7) in order to assist the thread transport into the shoot-in tubes (4, 4') that are rotating past it.
5. Apparatus for carrying out the method in accordance with claim 1 characterised by a rotary gate (23) which has a fixed reduction ratio relative to the weaving rotor (20) and which feeds compressed air for the injector nozzles or additional nozzles (2, 16) from a compressed air supply line (30) via a rotating aperture (41) into pulse feed lines (31) placed behind the aperture (41), with each of the pulse feed lines (31) being led to one of the injector nozzles (2) or additional nozzles (16) mounted on the spatially fixed ring part (11).
6. Apparatus in accordance with claim 5 characterised in that the pulse feed lines (31) begin with cut-outs (43) arranged uniformly on a circle after the rotating aperture (43) in the direction of flow.

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