CN1871386B - Method for selecting and feeding weft yarns and rapier weft insertion loom with device for selecting and feeding weft yarns - Google Patents

Abstract

A device (16) for selecting and feeding the weft yarn (14) is provided in the rapier weft loom, which includes a plurality of yarn adjusters (19) that can move from a rest position A to a working position B. In the working position B, the weft yarn extending between the conveyor and the selvage is wrapped around a turning edge (31) located between the selvage and the adjuster, which extends at least approximately in the direction of movement of the rapier (11), such that the rapier grasps this segment (14a) of the weft yarn (14) between the turning edge (31) and the adjuster (19).

Description

Method for selecting and feeding weft yarns and rapier weft insertion loom with device for selecting and feeding weft yarns

technical field

The invention relates to a method for selecting and feeding weft yarns to a rapier of a rapier weft insertion loom, which receives the weft yarns and introduces them into a shed, wherein the weft yarns extend from the selvage region to the delivery mechanism The invention also relates to a device for carrying out the method by means of an adjuster belt movable from a rest position to an operating position to the receiving position of the rapier.

Background technique

It is known (EP 0161014B1) that a yarn extending between the selvage and the delivery mechanism is placed on the turning edge by means of a regulator, and is inserted into the shed when it moves into the shed by means of a so-called weft feeding rapier (Bringergreifer). Sod. The weft feeding rapier catches the incoming thread between the deflection edge and the selvedge with a clamping mechanism located on its upper side.

It is also known (EP 0906461B1) to place the weft thread introduced into the shed by means of an adjuster onto the turning edge, which is located between the selvedge and the adjuster. The weft thread is caught by means of a weft delivery rapier on both sides of the turning edge and is carried by the weft delivery rapier which moves into the shed.

Also known (EP 1020550A1), will extend from selvedge to conveying mechanism and take the weft yarn that is brought to receiving position by means of regulator to catch and introduce shed way by means of a weft sending rapier. The weft delivery rapier receives the weft thread and first brings it to the clamping plate to ensure problem-free clamping in the weft thread rapier. A cutting mechanism with a rotating blade is arranged between the selvedge and the clamping plate, which cuts the introduced weft yarn before the weft yarn leaves the clamping plate.

It is also known that the weft thread introduced into the shed is introduced into the shed by means of a weft rapier (Nehmergreifer), that is to say by means of an empty feed into the shed from the side opposite the weft thread input device and when it The rapier that pulls the weft yarn into the shed when it is removed from the shed again. In a known form of construction (FR 1538375), a plurality of thread regulators are arranged in a row one after the other on a carriage movable in the direction of movement of the rapier, so that the thread regulators that provide the weft yarn introduced Can be brought into position above the rapier. The yarn regulator then sinks so that the rapier catches the weft yarn between the selvedge and the regulator. On introduction, the yarn runs over the hook knife and is cut between the selvage and the regulator. In another form of construction (US 3299909), a plurality of weft threads from the transport mechanism is kept between the shuttle eye and the clamping plate. The shuttle eye and the gripper are located on a carriage that can be moved transversely to the direction of movement of the weft receiving rapier, so that the yarn section located between the gripper and the gripper can be brought over the area of the rapier, where it is Its upper side is provided with hook. The selected feed piece is then lowered into the region of the rapier. In another construction of this type, the weft thread extending from the selvedge to the delivery mechanism is assigned a thread regulator which can be moved in a vertical direction between a rest position and an operating position. The regulators are arranged successively in a row, which is distributed parallel to the direction of motion of the weft-connecting rapiers. The weft thread selected for weft insertion is first moved downwards from its regulator into an area where the weft thread can be taken up by a feed arm which performs an oscillating and sinking movement. The feeding arm always brings the selected weft thread to the same position, where it can be caught by the rapier provided with the carrying mechanism on its upper surface. Also known (US 3147778), wherein when weft yarn beats up, the weft yarn of beating up is separated from the weft yarn from the conveying mechanism and received by a common suction yarn mechanism. The weft thread introduced is selected by means of a thread adjuster, which sinks in order to bring the selected weft thread into the region of the weft joining rapier, which is likewise provided on its upper side for Hook-shaped receiving mechanism for weft threads.

Contents of the invention

The object of the present invention is to provide a method of the type mentioned at the outset, with which the weft thread is selected and fed to the receiving position with a simple movement, wherein there are only minor positional requirements for the individual elements, including the rapier and its guide , so that a relatively small shed is sufficient, and the shedding tool and the reed can be constructed correspondingly smaller.

This task is solved in that the adjuster places the corresponding weft thread when moving from its rest position into its working position on a deflection edge extending at least approximately in the direction of movement of the rapier, so that the gap between the deflection edge and the adjuster The weft yarn segment is brought to the receiving position in the rapier moving track.

In a preferred refinement it is provided that the rapier is a weft receiving rapier which draws the weft thread into the shed by means of a movement from the shed. Such a weft receiving rapier requires only a relatively small cross-section, so that the distance between the adjuster and the deflection edge can be correspondingly small.

In another embodiment of the invention, the adjuster brings the respective weft threads to the receiving position before the rapier reaches the receiving position, and the rapier substantially deflects the weft threads in the receiving position downwards and moves them Grab and carry in reverse. In this embodiment, a relatively large time interval is provided during which the weft thread can be brought to its receiving position.

Using the method according to the invention can provide an advantageous rapier weft insertion loom, which is provided with a device for selecting and feeding weft yarns, and is characterized in that between the selvedge and the regulator at least one A deflection edge for the weft thread extends approximately in the direction of movement of the rapier, and the trajectory of the movement of the rapier is distributed between the regulator and the deflection edge in the working position. Such a weaving machine is particularly advantageous when a weft receiving rapier is provided, wherein the weft receiving rapier can be inserted into the shedway of the weaving machine from the side opposite the device for selection and feeding.

In a further refinement of the invention it is provided that the adjusters are arranged stationary one behind the other in a row which runs substantially parallel to the deflection edge. As a result, all weft threads can be brought to substantially the same position relative to the rapier, which is constructed such that its hook-shaped clamping element protrudes from the weft thread gripped by the last adjuster of the row. Arranging the weft thread between the regulator and the deflection edge is advantageous for the gripping of the weft thread.

Further features and advantages of the invention are given in the following description of the embodiments shown in the drawings.

Description of drawings

Fig. 1 shows the view along the direction of weft insertion for selecting and feeding a device for weft yarn according to the present invention;

FIG. 2 shows a plan view of the device according to FIG. 1 according to the invention;

Figures 3-6 show a top view similar to Figure 2 of the embodiment of Figures 1 and 2, during the start of weft yarn reception and weft insertion;

Figure 7 shows a view similar to Figure 1 of a variant embodiment;

FIG. 8 shows a perspective view of the embodiment according to FIG. 7;

Figure 9 shows a view similar to that of Figure 1 of another variant embodiment;

FIG. 10 shows a plan view of the device according to the invention, which includes a stretcher and a selvage threader.

Detailed ways

In FIGS. 1 and 2 only a rapier belt 10 or rapier strip is shown in the actual weaving machine, which supports at its end a rapier 11 designed as a weft receiving rapier. The loom weaves a fabric 15 from warp threads 12, 13 and weft threads 14, the fabric being shown only schematically. The weft thread 14 is beaten on the edge of the fabric with a reed not shown. For the introduction of the weft thread 14, the warp thread is divided into an upper warp thread sheet 13 and a lower warp thread sheet 12 by means of a shedding device not shown, so that a shed is formed into which the weft thread 14 can be introduced. The insertion of the weft thread takes place by means of a pick-up rapier 11 which is inserted into the shed from the side opposite the side on which the weft thread 14 is prepared. The weft receiving rapiers 11 each carry one, possibly also a plurality of weft threads 14 when they are removed from the shed.

The weft thread 14 introduced into the shed during weft insertion is selected by means of the device 16 and fed to the rapier 11 . The device 16 has a basic body or a base plate 17 which is fixed by means of a screw 39 on a profiled guide rail 38 extending in the weft insertion direction. On this profile guide 38 the base plate 17 can be pushed and held in position adapted to the fabric width by means of elements arranged thereon. The entire device 16 can thus be adapted to different fabric widths in a very simple manner.

The device comprises a needle-shaped thread regulator 19 whose drive mechanism 20 is arranged on a support 21 and which extends downward at an acute angle so that it can be displaced approximately vertically downward. The transmission mechanism 20 of the thread regulator 19 can be constructed, for example, as disclosed in EP 0598264 B1, so that the thread regulator 19 moves between the rest position A ( FIG. 1 ) and the working position B. The thread regulators 19 are each provided at their lower ends with loops 22 through which a respective weft thread 14 runs. The weft threads 14 run from the selvedges of the fabric 15 via the loops 22 in each case to a conveying device, for example to a pre-washer.

Arranged on the base plate 17 is a strip 23 on which a thread dividing mechanism 24 is arranged. The yarn dividing mechanism 24 has a disc knife 25 which is driven by means of an electric motor 26 . The disc knife 25 is equipped with yarn guides on both sides, which are formed by slats 23 and guide tongues 28 , 29 .

Another slat 30 is provided on the base plate 17 of the device 16, which forms a turning edge 31 by means of an upwardly protruding foot, which extends parallel to the direction of movement of the rapier 11, that is, transverse to the direction of the warp threads 12, 13. direction. As can be seen from FIG. 1 , deflection edge 31 lies in a plane with weaving point 32 of fabric 15 and the thread guide formed by strip 23 and guide tongues 28 , 29 .

As can be seen from FIG. 2 , the base plate 17 can be moved in the profiled rail 38 in the direction of the fabric width. The receiving openings for the fastening screws 39 ( FIG. 2 ) of the base plate 17 are slots directed transversely to the profile rail 38 and can therefore also be adjusted in the transverse direction. By means of this adjustment, the thread regulator 19 and its ring 22 can be adjusted transversely to the rapier 11 . The slats 23 with the cutting means 24 can be fixed on the base plate 17 in an adjustable manner not only transversely to the warp threads, but also in the longitudinal direction of the warp threads. As a result, its position can be adjusted not only in the transverse direction to the deflection edge 31 but also in the longitudinal direction to the end of the deflection edge 31 . It is preferably provided in practice that the adjustment of the slat 23 with the cutting mechanism 24 and the slat 30 with the turning edge 31 relative to each other and with respect to the adjuster is carried out in the factory, and then the slat 23, 30 is fixed in this position, making it impossible or difficult for the user to change the position. This can be achieved, for example, by providing a specially designed tool engagement surface for the fastening screw. The same position can also be sealed. The user of the weaving machine can only make small adjustments of the entire device 16 in the direction of the width of the machine and, if necessary, also transversely to this direction. In order to ensure that the user cannot easily move the device 16 in a direction transverse to the profiled rail 38 at his loom, the lateral adjustability can be separated from the fixation on the profiled rail 38 so that only The device 16 is moved along the width of the machine.

As can be seen from FIG. 1 , when the adjuster 19 and its loop 22 are in the rest position A, the weft thread 14 is located above the rapier 11 , the turning edge 31 and the cutting mechanism 24 . If the adjuster 19 is switched to its working position B, as shown in FIGS. Section 14a is located below tip 33 of rapier 11 . The rapier 11 moves over this section 14a and deflects it downwards. When the rapier 11 is moved back again, the rapier catches the thread section 14a with its hook 34, for which a yarn clamping plate 35, which is only schematically shown in FIGS. 2 to 6, is assigned. The hook 34 and the clamping plate 35 are located on the side facing the section 14 a of the weft thread 14 , that is to say below the upper side of the rapier 11 .

The rapier 11 moving back into the shed carries the weft thread received on the segment 14a and draws it on the turning edge 31 in the direction to the shed. Here the weft thread 14 reaches the cutting device 24 in which the weft thread is cut off from the section remaining on the selvedge before it is introduced into the shed.

The selection of the inserted weft thread 14, ie the switching of the regulator 19 from its rest position A into its working position B, is controlled by a controller 36 which preferably belongs to the device 16 and is arranged thereon. The controller 36 obtains instructions to control the loom. The controller 36 also switches on the motor 26 of the disc knife 25 .

This can be done individually for each weft insertion or continuously at high weft thread speeds.

The yarn regulators 19 are arranged in a row one after the other, only four of which are shown here. This column extends parallel to the path of motion of the rapier 11 and the turning edge 31 . Because the adjusters 19 each occupy the same working position B, the yarn section 14a runs at the same angle between the loop 22 and the deflection edge 31 in side view ( FIG. 1 ), even though the loop 22 and the selvedge (Fig. 2) The angle between them is different. As a result, the rapier 11 with its hook 34 and the clamping plate 35 always grips the yarn section 14a in the same way.

In the device according to the invention, the thread regulator 19 runs downwards with its moving parts, so that it deposits the weft thread on the deflection edge 31 . As shown in FIG. 1, this can be achieved by having the adjuster 19 point at an acute angle. It is of course also possible to arrange the actuator so that it points vertically and only moves vertically.

Usually there are enough places in the machine width direction in the weaving machine to arrange a plurality of thread regulators 19 in a row. However, it is also possible to arrange the thread conditioners 19 in several rows. In order to achieve as uniform a take-up of the yarn section 14a as possible by the rapier 11, it is expedient to sink a row of weft adjusters 19 arranged at a greater distance with respect to the deflection edge 31 slightly lower, so that the loop 22 The yarn section 14a between the deflection edge 31 and the deflection edge 31 always runs at the same angle as far as possible. But the slight difference in angle is easily compensated, because the rapier deflects the yarn segment in the receiving position downwards.

In the embodiments shown in FIGS. 1 to 6 it is provided that the weft thread 14 is only separated from the selvedge when it is reintroduced into the shed. But it is also possible to feed each weft thread into the dividing mechanism and separate it when it is beaten up to the edge of the fabric. In this case, the free ends are clamped by clamping plates. Such a clamping plate, which is arranged between the selvedge and the cutting device 24 , is a component of the device 16 in this exemplary embodiment.

It should also be pointed out that in the exemplary embodiment according to FIGS. 1 to 7 the distance between the device 16 and the cutting device 24 and the web is shown exaggeratedly, in order to obtain an easier-to-understand illustration. In practice, however, a much smaller distance is possible, in particular between the working position B of the thread regulator and the deflection edge 31 .

The exemplary embodiment according to FIGS. 7 and 8 corresponds in principle to the exemplary embodiment in FIGS. 1 to 6 . A bracket 37 is provided for the adjuster 19 and its gear mechanism 20 , which is inclined in the direction of the deflection edge 31 , so that overall shorter needle-shaped adjusters 19 can be used. Another difference is that the slat 23 with the cut-off mechanism 24 and the slat 30 with the turning edge 31 are combined into one part which can only move together relative to the base plate 17 and the adjuster 19 .

In the exemplary embodiment according to FIG. 9 , a thread regulator 19 is provided, which can be pivoted between a rest position A and an operating position B by means of a transmission 20 designed as a drive motor. The loop 22 of the thread regulator 19 moves here on a path of motion which largely corresponds to the path of motion of the exemplary embodiments according to FIGS. 1 to 6 and FIGS. 7 and 8 . The axis 40 of the drive motor is lower than the deflection edge 31 , so that the yarn section 14 a, which is brought into the receiving position of the movement path of the rapier 11 , can also be tensioned as well as in the other embodiments.

In the embodiment according to FIG. 10 , the difference from the embodiment according to FIGS. 1 and 2 is primarily that instead of the rotating disk knife 25 a blade 55 is provided which preferably has a razor-sharp cutting edge. The easily replaceable blade 55 is oriented in such a way that the weft thread 14 carried by the rapier 11 slides over the edge of the blade 55 and thereby cuts off. The cutting mechanism 24 with the stationary blade 55 does not require a transmission.

Furthermore, in the exemplary embodiment according to FIG. 10 , a support 57 is arranged on the base plate 17 , which supports a fabric stretcher 56 . This bracket 57 is fixed on the base plate 17 with an adjustable fixture 59, for example with a slot-type yarn guide passing through the bracket 57 and a slot-type yarn guide extending perpendicularly to the slot-type yarn guide in the transverse direction of the base body 17. The screw 59 is fixed.

A selvage threader 58 is arranged in a corresponding manner on the support 57 , which is indicated by dashed lines. The selvage threader 58 can be arranged on the support 57 in a manner not shown in detail by means of adjustable fastening elements.

Therefore in many cases it is sufficient to only move the support 17 when switching to different fabric widths, wherein the thread regulator 19, the cutting mechanism 24, the stretcher 56 and the selvage threader 58 are simultaneously connected to different fabric widths. Fabric width to match.

In the embodiment according to FIGS. 1 to 6 , the embodiment according to FIGS. 7 and 8 and the embodiment according to FIG. 9 it is provided that when the section 14a of the weft thread 14 is clamped by the rapier 11 and introduced into the shed, it is in the working position B The yarn regulator 19 moves back to an intermediate position between the working position B and the rest position A. This ensures that the doffing of the weft thread by the centrally located thread loop 22 is not disturbed by other weft threads and that the weft thread is held in a favorable position in the shed.

Claims (12)

1. be used to select weft yarn (14) and feed method to the arrow shaft (11) of arrow shaft formula weft thread-leading machine with weft yarn (14), this arrow shaft receives weft yarn and introduces race, wherein the weft yarn that extends to conveying mechanism from selvage area is by means of the receiving position that can take arrow shaft (11) from the adjuster (19) that resting position (A) moves to operating position (B) to, it is characterized in that: described adjuster (19) when moving to operating position (B) from resting position, corresponding weft yarn (14) is placed into one approximate at least along turning on the edge (31) that the direction of motion of arrow shaft (11) is extended, thereby will turn to weft yarn (14) between edge (31) and the adjuster (19) section to take on the receiving position in arrow shaft (11) tracks.

2. by the described method of claim 1, it is characterized in that: described arrow shaft being connects latitude arrow shaft (11), and it is drawn in weft yarn (14) in the race by means of the motion from race.

3. by the described method of claim 2, it is characterized in that: describedly connect latitude arrow shaft (11) and will take to the shut-off mechanism (24) from weft yarn (14) section that arrow shaft extends to selvage area.

4. by the described method of claim 2, it is characterized in that: described adjuster (19) takes corresponding weft yarn (14) to receiving position before arrow shaft (11) arrives receiving position, and the weft yarn (14) that arrow shaft (11) will be arranged in receiving position offsets downward basically and catches after its reversing of motion and carrying.

5. by the described method of claim 1, it is characterized in that: described yarn adjuster (19) is being transformed on the centre position that is positioned between resting position (A) and operating position (B) during weft yarn (14) wefting insertion.

6. have and be used for selecting and feed arrow shaft formula weft thread-leading machine to the device of weft yarn (14), it comprises a plurality of adjusters (19) that can move to operating position (B) from resting position (A), the weft yarn that extends to conveying mechanism from selvage area takes the receiving position of arrow shaft (11) to by means of described adjuster (19), it is characterized in that: between described selvedge and yarn adjuster (19), be provided with one approximate at least along the direction of motion of arrow shaft (11) extend be used for weft yarn (14) turn to edge (31), and the tracks of arrow shaft (11) is at the yarn adjuster (19) that is positioned at operating position (B) with turn to extension between the edge (31).

7. by the described arrow shaft formula of claim 6 weft thread-leading machine, it is characterized in that: be provided with one and connect latitude arrow shaft (11), its can from be used to select and feed to the race of the opposed side insertion of device (16) loom.

8. by claim 6 or 7 described arrow shaft formula weft thread-leading machines, it is characterized in that: a shut-off mechanism (24) is set turning between edge (31) and the selvedge, it is nearer from selvedge than yarn adjuster (19).

9. by the described arrow shaft formula of claim 8 weft thread-leading machine, it is characterized in that: described shut-off mechanism (24) comprises a disc knife (25) that drives rotation.

10. by the described arrow shaft formula of claim 7 weft thread-leading machine, it is characterized in that: on the direction of motion of arrow shaft (11), be positioned at the below at the tip (33) of arrow shaft at the connecting line that turns to edge (31) and be positioned between the ring (22) of yarn adjuster (19) of operating position (B), and be positioned at the inside of the profile of arrow shaft (11).

11. by the described arrow shaft formula of claim 6 weft thread-leading machine, it is characterized in that: described yarn adjuster (19) is arranged to static row successively still, these row are arranged essentially parallel to and turn to edge (31) to distribute.

12. by the described arrow shaft formula of claim 6 weft thread-leading machine, it is characterized in that: described yarn adjuster (19) can stop on the centre position that is positioned between resting position (A) and operating position (B).

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