EP0973965B1 - Weaving loom with pneumatic weft thread insertion - Google Patents

Description

The invention relates to a loom with pneumatic Weft entry.

Weaving machines are part of the state of the art pneumatic shot insertion known, the Shot entry either by means of a 'swiveling, on Reed-mounted insertion device or by means of a stationary, mounted on the machine frame Entry device is carried out.

The looms with swiveling entry device have disadvantages. The one entered Weft thread is in the area of the reed stop clamped and cut so that the setting of the Blow nozzles in the entry position only during the Provision of the reed can be done what particularly limits the number of blow nozzles and also requires special control. By the back and forth of the with the entry device provided reed are relatively high mass forces generated, which leads to undesirable vibrations of the moving system lead and become the weft threads in Feed from the thread feeder into the blow nozzles in uncontrolled vibrations so that they cross and impose against each other. The air lines and the actuator are too high subjected to mechanical stress, especially for the actuator a complex control makes necessary. It follows from these disadvantages a higher susceptibility to failure lower speeds of the Looms what with a loss of productivity connected is. It also proves to be disadvantageous that scissors are mounted on the machine frame and over separate drive means is operated, which one results in greater expenditure on equipment. Another The disadvantage is the use of a thread clamp active clamping, in which at least one clamping member is actively operated. Especially with fine yarns thread breaks occur more often.

From DE-A 32 04 007 (D1 is a device and a Process for blowing weft threads different Color known.

This device contains a plurality of main nozzles 2a to 2d with blowpipes 2a to 3d, which are connected by a strip 5 are interconnected and a lever arrangement 6,7,8 for adjusting the blowpipes with respect to the guide channel 91 in the reed. The position of the blowpipe is determined by a Lever 8 determined on the pivot point 7. The lever movement can e.g. B. from a dobby, not shown be derived. Furthermore, between Riet and blowpipe a cutting device 50 arranged around the weft to cut (Fig.2). On the execution that Arrangement as well as the function of the cutting device there are no indications from the D1, so that the Clues is just a trivial statement about that the weft has to be cut.

The procedure is to be entered Select weft and the respective nozzle on the Adjust guide channel 91 in the reed.

The task to be solved is seen in the fact that the Disadvantages cited prior art avoided be and that a less fragile and simple Control is guaranteed.

Webmaschinen und werden einer anderen Gattung zugeordnet. Diese Webmaschine weist einen Webschaft 2 mit Litzen 13 für die Kettfaden, zwei Schaftrahmen 15 mit Litzen 14 für die Kantenfäden, einen Fadenführer, einen Schneidmechanismus (nicht dargestellt), einen hin und her beweglichen Greifer 8,eine Saugdüse 9 und eine Schere 10 auf.CH 390 826 (D2) discloses a rapier weaving machine which weaves with a closed shed. Such weaving machines differ from air both in their structure and in their function

Weaving machines and are assigned to a different genus. This weaving machine has a heald frame 2 with healds 13 for the warp threads, two heald frames 15 with healds 14 for the edge threads, a thread guide, a cutting mechanism (not shown), a back and forth movable gripper 8, a suction nozzle 9 and a pair of scissors 10.

To insert a weft thread, the gripper is removed from the Pull-out page led through the open shed and takes over the weft on the entry side in the area between thread guide 7 and fabric edge. The weft is cut before entry and by the gripper pulled through the shed. That through the edge threads formed shed is closed before the gripper is off this shed emerges. This measure takes place on the one hand maintain the weft tension and on the other hand, the end of the weft from the hook pull.

The disadvantages of the rapier weaving machine can be seen in that the shed forming the edge threads is closed before the gripper emerges from this shed. Due to the friction of the edge threads on the hook, the Weaving machine can be operated at a low speed.

The object of the invention is a weaving machine with pneumatic shot insertion so that the disadvantages mentioned do not occur.

According to the invention, this object is achieved with a weaving machine solved as it is characterized in the claims.

The achievable with the invention are in essential to see that up to sixteen Weft threads of different types and colors applied can be and that the loom with a high Speed can be operated.

The invention is described below with reference to the enclosed Drawings explained.

Fig.1

eine Ausführungsform einer erfindungsgemässen Webmaschine mit Lufteintrag in schematischer Darstellung,

Fig.2

eine im Schnitt dargestellte Seitenansicht des Schusseintragbereiches der Webmaschine,

Fig.3

einen Schnitt entlang der Linie III-III in Fig.2,

Fig.4

einen Schnitt entlang der Linie IV-IV in Fig.2,

Fig.5

einen Schnitt entlang der Linie V-V in Fig.2,

Fig.6

einen Schnitt entlang der Linie VI-VI in Fig.2,

Fig.7

eine Ausführungsform einer Steuervorrichtung für die Blasdüsen,

Fig.8

Eine schematische Darstellung der Fachstellungen nach Abschluss der Schusseintragung,

Fig.9

einen Schnitt entlang der Linie IX-IX in Fig.2, welcher die Situation beim Schussfadeneintrag darstellt,

Fig.10

den Schnitt nach Fig.9, welcher die Situation bei der Klemmung des Schussfadens darstellt,

Fig.11

den Schnitt nach Fig.9, welcher die Situation beim Schnitt des Schussfadens darstellt,

Fig.12

den Schnitt nach Fig 9, welcher die Situation beim Blattanschlag darstellt und

Fig.13

eine andere Ausführungsform einer Schere.

Show it:

Fig.1

an embodiment of a weaving machine according to the invention with air intake in a schematic representation,

Fig.2

2 shows a sectional side view of the weft insertion area of the weaving machine,

Figure 3

2 shows a section along the line III-III in FIG. 2,

Figure 4

2 shows a section along the line IV-IV in FIG. 2,

Figure 5

2 shows a section along the line VV in FIG. 2,

Figure 6

2 shows a section along the line VI-VI in FIG. 2,

Figure 7

one embodiment of a control device for the blowing nozzles,

Figure 8

A schematic representation of the specialist positions after completion of the shot entry,

Figure 9

2 shows a section along the line IX-IX in FIG. 2, which represents the situation when the weft thread is inserted,

Figure 10

9 the section according to FIG. 9, which represents the situation when the weft thread is clamped,

Figure 11

9, which represents the situation when the weft thread is cut,

Figure 12

the section of Fig. 9, which represents the situation at the blade stop and

Figure 13

another embodiment of a pair of scissors.

The weaving machine in question contains a Machine frame 1, a warp beam 2 from the warp threads 3.4 can be drained, a match tree 5, a Shed forming device 6 with a device for Selvedge formation, an arrangement 7 for entering Weft threads, a reed 8, a goods deduction 9 and one Warenbaum 10. The shedding device 6 forms over Healds an upper and lower compartment 11, 12 with the Warp threads 3.4 and a compartment with the square threads (Fig. 8).

As FIG. 2 shows, the arrangement 7 contains one pneumatic weft insertion device 14 and a Scissors 15 and a blowing aid 17, which in Thread running direction between the insertion device 14 and the reed 8 are arranged. The entry device 14 is mounted on the machine frame 1. The scissors 15 is with the reed 8 coupled. The blowing aid 17 is with the Webblatt 8 connected.

The entry device 14 contains a support part 21, eight Blow nozzles 22, a nozzle block 23, a holder 24 and an actuator 25. The support member 21 is attached to the machine frame 1 by means of screws 26. The Blow nozzles 22 are arranged in pairs and stand with a compressed air source and a weft store in Operatively connected. The blowing nozzles 22 are in the nozzle block 23 detachably mounted on one side. The holder 24 for the Nozzle block is connected to the support part 21. The Actuator 25 is via a kinematic Organ 27 connected to the shedding device 6 to the Blow nozzles 22 to put in the bullet position. For this the nozzle block 23 and the holder 24 are configured such that the mouth of the blow nozzles at right angles to each other extending directions are pivotable. It is a feather 28 provided which the kinematic organ 27 under Tension holds. It should be noted that instead the actuator 25 a drive assembly can be provided via a known per se Control device is driven to in the blow nozzles to put the entry position.

As FIG. 3 shows, the reed 8 is on one Sheet bar 31 mounted. There is one on the sheet bar Thread guide device 32 attached. It's from Advantage if the guide device 32 a Air supply part 33, which is mounted on the sheet bar is a plurality of fins 34 that are comb-like arranged and each provided with a recess 35 are to determine a guide channel 36 and Relay nozzles 37 contains to the registered To promote weft 38 through the guide channel. Instead of the thread guide device 32, a so-called tunnel reed with relay nozzles applied become.

In the weaving machine in question, the Blow-in aid 17 applied with advantage. The blowing aid is a plate-shaped body 41 with a conical Penetration 42 and with an outlet slot 43. The Body 41 is attached to the air guide part 33. It however, the first lamella 34 is possible as a blowing aid train (Fig. 4).

The scissors 15 have a fixed and a movable Scissors blade 51.52. The stationary scissor blade 51 is on Machine frame 1 attached. The movable scissor blade 52 is mounted on the reed 8 (Fig. 5).

The Fig. 6 shows the assignment of the blow nozzles to the through the fins 34 determined guide channel 36. Ein essential feature of the weaving machine is that the respective pair of blow nozzles essentially parallel is aligned with the center line of the guide channel 36, when the guide channel takes the entry position. The Adjustment of the blowing nozzles 22 takes place through the Actuator 25 and the kinematic element 27. Alternatively, the blow nozzle 12 can be bundled to be ordered.

As FIG. 7 shows, the shedding device 6 comprises e.g. a jacquard or dobby, one Color control device 56, a summing gear 57 and a one-armed lever 58 which on the machine frame 1 is articulated. Such summing gear and their Function are known, so on a description the same is waived. On the lever 58 that is kinematic organ 27 attached to the Actuator 25 is connected.

The entry process is described below with reference to FIGS. 8 to 12 described. For looms, the Main drive shaft of the loom a weft registered and posted on the product edge 60. Out this machine cycle is the control of the individual Derived elements of the weaving machine. In the above described loom is generally the drive of the Webblattes 8 and based on the weft entry only the setting of the blowing nozzle 22 to the bullet position and the entry of the weft thread 38 in dependence of the angle of rotation of the main shaft.

Fig. 8 shows the clamping process of the entered Weft by means of the device for Selvedge formation, the weft thread starting out from the blow nozzle 36 (not shown) through the Loom extends. This facility is designed that on the one hand by means of the through the strands 61,62 moving fold threads 63, 64 a compartment is formed and on the other hand, the change of subject immediately after completion the insertion process of the weft thread is initiated. Due to this change of subject, the registered Weft thread 38 by means of the square threads 63, 64 frictionally clamped. This frictional clamping is until Striking the weft thread 38 in an advantageous manner maintained by means of the square threads 63, 64. To the The time at which the weft thread is separated is this already frictionally clamped that the severed Weft thread no longer comes loose (Fig. 10). Point of time the weft 38 is separated by the design or functional assignment of the scissors intended to move the reed 8. this has in particular the advantage that the controller for the Scissors is simplified.

Fig. 9 shows the situation during the entry a weft 38. The blowing nozzle 22 is in the Entry position made. The reed 8 is in the retracted position, the scissors 15 is in the open position and the weft is through the Blow-in aid 17 and this through the square threads 63, 64 in the Guide channel 36 of the thread guide device 32 injected.

After the weft 38 in the guide channel 36 is entered, the Change of subject of the square threads 63, 64 and the Weft thread 38 frictionally clamped by the warp threads (Fig. 10). Furthermore, the reed 8 is in the direction of Swinged stop position.

After clamping, the weft 38 is cut, because the scissor blade 52 connected to the reed 8 is moved against the stationary scissor blade 51. Thereby a new weft thread is provided for insertion. Furthermore, the weft thread 38 is through the reed 8 moved (Fig. 11).

Then the reed 8 reaches the stop position, the weft 38 through the reed 8 to the previously struck and already by the Tray change tied weft thread. Then the reed 8 is pulled back into the Position swiveled (Fig. 12).

As the Fig.13 shows another version of the scissors 15. The scissors still have a fixed blade 71 and a movable shear blade 72, which is pivotable with respect to the fixed blade. to Operation of the movable shear blade is a electric stepper motor 73 is provided.

So in the loom described above the weft 38 through the stationary Weft insertion device 14 in the guide channel 36 entered and during the pivoting of the reed 8 held, cut and chipped. Resulting from it yourself a number of advantages. Through the fixed Entry device is the supply of the weft from a weft feeder safer and the period for Adjustment of the blow nozzle in the entry position extends substantially, leaving up to sixteen weft threads different color and type can be entered. Due to the frictional clamping and the movement of the registered weft with the reed up to The stop will ensure that the Weft thread ensures that the protruding Weft end sections are short and little waste accrues.

Claims (11)

1. Loom with pneumatic weft insertion, wherein the loom has a reed (8) and a weft thread guide device (32), with a guide channel (36) which are connected to one another and pivotable between an insertion position and a beat-up position, a weft insertion device (14) of fixed position with at least one blowing nozzle (22) for the insertion of a weft thread (38) into the guide channel (36) and a shearing device (15), characterised in that a means (61, 62; 64, 65) is provided for the formation of the selvedge with selvedge threads which is intended to clamp the weft thread (38) after the termination of the weft insertion by means of frictional engagement and to guide it from the insertion position to the beat-up position while maintaining the clamping action, and in that the shearing device (15) has a fixedly arranged blade (51) and a movably arranged blade (52) the actuation of which is coordinated with the movement of the reed (8) and which cooperates with the fixedly arranged blade (52), so that the clamped weft thread is cut off outside of the selvedge after the termination of the weft insertion in the region between the rear position and the beat-up position of the reed (8) during the pivoting.
2. Loom in accordance with claim 1, characterised in that the shearing device (15) and a blow-in guide part (17) are arranged behind one another in the thread running direction between the mouth of the blowing nozzle (22) and the guide channel (36).
3. Loom in accordance with one of the claims 1 or 2, characterised in that the insertion device (14) is mounted on the machine frame (1).
4. Loom in accordance with claim 1, characterised in that an actuating device (25) is provided in order to position the blowing nozzle (22) in the insertion position in accordance with a weaving pattern program.
5. Loom in accordance with one of the claims 1 to 4, characterised in that the insertion device (14) has a plurality of blowing nozzles (22).
6. Loom in accordance with claim 5, characterised in that the blowing nozzles (22) are movable up and down and/or pivotable about axes which cross at right angles.
7. Loom in accordance with claim 5, characterised in that the blowing nozzles (22) are arranged pair-wise and above one another or are arranged in bundle-like manner.
8. Loom in accordance with claim 1, characterised in that the movable blade (52) is coupled to the reed (8) or to a drive means (73).
9. Loom in accordance with claim 8, characterised in that the drive means is an electric motor.
10. Loom in accordance with claim 2, characterised in that the blow-in guide part (17) is arranged in a fixed position or connected to the reed (8).
11. Loom in accordance with claim 10, characterised in that the blow-in part (17) has a conical penetration (42) the largest width of which confronts the opening of the blowing nozzle (22) and has an outlet slot (43) for the weft thread (38).

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