EP1277864A2 - Weft inserting device for weaving looms with stationary weft supply bobbins - Google Patents

Abstract

A weaving loom has opposing thread presentation and acceptance heads meeting at the shed mid-point, one head has bush (31) and other tapered probe (41) which engage and centre weft thread presentation grip to acceptance grip A weaving loom has a fixed spool feeding a weft thread insert at the web periphery. The loom has contra-motion grip rods extending from both sides into the shed, and equipped with presentation and acceptance heads. The presentation head picks up a thread at the web periphery, and surrenders this at the mid-point to the acceptance head. The loom has inclined insert guides limiting the risk of collision between presentation and acceptance heads. Each head has warp thread guide surfaces and weaving reed guide rails. The presentation (3) and acceptance (4) heads esp. incorporate centring units parallel to the direction of travel and have interlocking profiles with bevelled interfaces (e.g. centring probe, 41; centring bush, 31). Just prior to reaching the mid-point, the presentation and surrender heads engage in a mutual centring action.

Description

The invention relates to a weft insertion element for weaving machines stationary supply spools in the area of a fabric edge, with Gripper bars moving in from both sides of the fabric at the same time Reach in the shed and move against each other with the hook heads on the gripper bars, designed as a delivery head or as a slave head, the in the center a weft thread presented by the head of the Hand over the slave head, with means on the bringer head to capture a Weft on the fabric edge and to present this weft in the section, with centers for taking over and clamping the from Bringer head presented weft thread on the slave head, with bevels on the means for presenting and taking over the weft to limit the risk of collision between delivery head and Slave head, with guide surfaces on each gripper head for guiding the same on the warp threads delimiting the shed and with guide rails on each gripper head to guide it on the fins of the reed.

Weft insertion elements of this type are, inter alia, by the DE 34 28 113 A1 known and are mainly on heavy looms used with a large working width. This includes and above all that Double-carpet weaving machines in which the two lie one above the other Weaving threads are entered at the same time.

The relative in cross section because of the need for low mass weak and slightly trained gripper bars are made of fiber-reinforced Plastic. The best possible vibration-free guidance is to One with fixed guide means on the side outside of the shed and on the other hand within the shed through the reed and through guide plates engaging in the shed, which in turn have guide rails interact in the head area of the grippers, guaranteed.

The guide rails in the area of the rapier head are the reed facing. You have a guide surface opposite the slats of the Reed and a along the direction of movement of the rapier Groove on the opposite side. This serves to engage the feet of the guide boards mentioned.

Such leadership has not proven itself. The boards must be relative be tightly arranged so that at least in every phase of the movement two of the feet are engaged with the groove. The large one required Number of guide plates that the warp threads in the upper and reach through in the lower compartment level, limits the space for the guidance of these threads during the change of subject. The guide boards mainly splice the large-volume and less rotated Pile threads and u. U. also the binding warp threads. There are errors in Form of stripes in the fabric. The expected effects in terms of Weft insertion performance is not achieved.

In practice, double-carpet weaving machines have prevailed, to assign guide rails to the gripper head, at least only slide on the reed during thread transfer. to Guiding the hook head between the thread levels of the shed guide plates were attached, which were arched against the warp thread sheets are directed. In the event of a deviation of the gripper head from the In the normal path, the warp threads set the hook head a certain amount Resistance to. The gripper heads move at previously acceptable Speeds approximately in the middle of the compartment openings.

You have a lot to improve the guidance of the rapier heads in the shed taut warp threads - e.g. B. the threads of the filling or tension chain - the Path of the gripper heads arranged immediately adjacent. Thereby achieved one - at least in one of two consecutive weft entries operated in one compartment or in one of two at the same time Fan - a smoother running of the gripper heads.

The means for taking over and presenting the weft thread on the head and the means for taking over the weft thread and for clamping of the thread up to the subject exit on the opposite side with regard to the mutual interaction in the weft transfer provided in the center with such a game that not even extreme vibrations of the rapier head in the shed Collision of these gripper bars. Take through these measures however, the dimensions of the gripper head in cross section are considerable Dimensions.

To ensure that the gripper heads function properly on a regular basis one tried not to exceed certain weft insertion frequencies. The shed has been kept in a size that the usual speeds for the stroke of the shafts, the stroke of the strands of jacquard machines and loads that are still acceptable for the weaving shop revealed. Up to now, the selected parameters have generally been used - especially by moving the sley parallel to itself (DE 32 05 227 A1) - a reliable working method of the weaving machines. However, efforts to increase web performance are increasingly demanding Also measure the transfer of weft thread from the bringer to the taker To realize the lifting movement reliably at higher speeds limit the shafts for shedding and limit the maximum stroke to reduce the sley.

The object of the present invention is a weft insertion member with gripper heads that can be moved against each other for the central weft transfer propose that significantly smaller cross-sectional dimensions and in a smaller shed at high weft insertion frequencies low vibration with high reliability can.

This object is solved by the features of claim 1. The Use of preferably separate centering elements on the Bringer and taker grabs that mutually on a common Align the level before the means to present and take over the Position the weft thread next to each other to perform its function, allow an advantageous design of the gripper head. On a smaller one Cross-section can compensate for larger, mutual deviations become. The mutual play of the means of presentation towards the Takeover funds can be reduced to a minimum.

If you also ensure - according to claim 2 - that the vibration possibilities of the rapier heads in the shed thanks to an almost form-fitting Leadership in the shed can be further reduced Rapier heads and the shed (opening angle and / or shed stroke) reduce significantly. While maintaining the high reliability of the Handling the weft thread when inserting the weft becomes the drive elements for shed training and / or for weft threading relieved. With the smaller working strokes for these drive elements in return, higher working speeds can be achieved.

There is also an advantage on weaving machines where three are used at the same time or multiple shots entered in superimposed weaving compartments become. The reduced mass of the gripper heads has an effect here and on the other hand the reduced subject height in a positive sense. Also on these machines, which allow a much greater variety of ties, are higher working speeds than before by the invention possible.

If one forms the centerings according to claim 3 at least transversely to the mutual Movement direction eleastisch and ensures a corresponding Damping the mutual impact, then there are further increases in performance in the realm of the possible.

The design of the gripper heads and their defined in claim 4 Centering allowed u. a. the use of simple manufacturing processes and the use of very light materials for the gripper heads.

The modification of the gripper heads according to claim 5 allows without separate guide elements, the damped, low-vibration guide the hook heads on the one hand on the warp thread coulters and on the other to realize the webs of the reed. The gripper heads can continue have reduced dimensions. The compartment height can be further reduced.

With the arrangement of the center of gravity of the gripper head according to claim 6 and 7 are in particular the vibrations that occur when the Rapier heads are created in the shed (buckling load on the rapier bars), reduced to a minimum.

The arrangement of the centering pins on the slave head - essentially parallel to the receiving hook - according to claim 8 optimizes the arrangement the means of presentation and takeover on the gripper heads.

The use of molded plastic parts - according to claim 9 - reduced on the one hand the mass of the gripper heads and on the other hand the manufacturing effort. With an appropriate choice of material, an additional damping effect occurs on.

Claim 10 shows a further design option, the reduction the mass of the gripper head and to reduce the tendency to vibrate when accelerating the rapier into the shed leads into it.

Fig. 1

eine vereinfachte, mit einzelnen Schnittbereichen versehene Darstellung (in Draufsicht) eines Bringerkopfes und eines Nehmerkopfes in der Phase des gegenseitigen Zentrierens,

Fig. 2

eine Seitenansicht zu Fig. 1,

Fig. 3

eine Anordnung der Greiferköpfe in den Webfächern einer Doppelflorwebmaschine mit seitlich angeordneter Zentrierung an den Greiferköpfen (analog Fig 1),

Fig. 4

eine Darstellung gemäß Fig. 3 mit einer zur Greiferstange zentral angeordneten Zentrierung an den Greiferköpfen,

Fig. 5

eine schematische Darstellung der wesentlichsten Funktions-elemente eines Bringergreifers und eines Nehmergreifers mit zur Achse der Greiferstangen koaxial angeordneter Zentrierung,

Fig. 6

eine perspektivische Darstellung zusammenwirkender Bringer- und Nehmergreifer analog zu Fig. 1 in einer perspektivischen Darstellung mit überwiegender Darstellung der Oberseite,

Fig. 7

eine ähnliche Darstellung wie Fig. 6, bei der die Darstellung der dem Webblatt zugewandten Seite überwiegt,

Fig. 8

eine Zentrierhülse mit elastischer Zentrierbüchse im Eingangsbereich,

Fig. 9

die Spitze eines Zentrierzapfens mit elastisch und gedämpft eingefügter Spitze und

Fig. 10

ein Beispiel für einen elastisch gelagerten Zentrierzapfen.

The invention will be explained in more detail below using exemplary embodiments. The accompanying drawings show:

Fig. 1

1 shows a simplified illustration (in plan view) of a feeder head and a slave head in the phase of mutual centering, provided with individual cutting areas,

Fig. 2

2 shows a side view of FIG. 1,

Fig. 3

an arrangement of the rapier heads in the shed of a double-pile loom with centering on the side of the rapier heads (analogous to FIG. 1),

Fig. 4

3 with a centering on the gripper heads arranged centrally to the gripper bar,

Fig. 5

1 shows a schematic representation of the most important functional elements of a carrier gripper and a slave gripper with centering arranged coaxially with the axis of the gripper rods,

Fig. 6

1 shows a perspective view of interacting bring and take grippers analogous to FIG. 1 in a perspective view with a predominant view of the upper side,

Fig. 7

6 shows a representation similar to FIG. 6, in which the representation of the side facing the reed predominates,

Fig. 8

a centering sleeve with elastic centering sleeve in the entrance area,

Fig. 9

the tip of a centering pin with inserted elastic and damped tip and

Fig. 10

an example of an elastically mounted centering pin.

Fig. 1 shows a pair of rapier heads 3, 4, in the shed of a loom interacts in such a way that a first gripper head, the so-called Bringer head 3, a weft thread 9 before entering the shed detects, clamps and this weft 9 in the middle of the shed the second gripper head moved in the opposite direction, the Slave head 4, offers for takeover.

The bringer head 3 is attached to the gripper bar 30 at the front end. A deflector plate 34, the coupling section 32, the gripper bar 30 and the guide rails 36 are screwed together 35 braced. Existing means for positive locking of the gripper bar 30 with the gripper head 3 are not shown. The kind of mutual Fastening is well known.

On the bringer head 3 are in the plane of the cross section of the gripper bar 30 the means 33 for detecting, clamping and presenting the Weft 9 arranged. The weft 9 is by these means approximately in the area of the longitudinal axis of the gripper bar 30 transversely in itself known tensioned, clamped and presented. At a lateral distance for this - preferably facing the specialist - is on Bringer head 3, the centering sleeve 31, which has a bore 311 and a conical or arcuate entrance area 312 is provided.

The slave gripper 4 is in the same way via a coupling section 422 connected to the gripper bar 40, as in relation to FIG Gripper head 3 has been described. Here the elements are a deflector plate 44, coupling section 422, gripper bar 40 and guide rail 46 held together by means of screws 45.

The slave head 4 has the gripper bar 40 in the cross-sectional plane an immovable catch hook 431 and a resiliently movable one Clamping slide 432. The driver hook 431 is like this with its tip arranged that he the weft 9 positioned on the gripper 3 overlaps inside. The driver hook 431 also engages relatively little play between the means 33 for presenting the weft thread 9 on the bridle 3. In particular, the catch hook 431 is for Avoidance of possible collisions also rounded off at its tip.

Paraliel to the driving hook 431 is on the slave head 4 in a warehouse 42 a centering pin 41 fixed. The centering pin 41 has one Shaft 411 and a tip 412. The centering pin 41 on the slave head 4 and the centering sleeve 31 on the delivery head 3 are in the stationary installation state the gripper rods 30, 40 aligned with each other with their axes.

When both gripper heads 3, 4 face each other in the middle of the compartment move, the tip of the centering pin 41 penetrates into the centering sleeve 31 on. Only when the axes of both elements are aligned and they lead each other positively, penetrates the tip of the catch hook 431 between the means 33 for presenting the weft thread 9 and thus initiates the takeover of the presented weft thread 9.

With this design and the way it works, it is possible to between the catch hook 431 and the means 33 for presentation the weft 9 to realize only very small lateral distances. As a result, the outer dimensions of the gripper heads 3, 4 can be clearly seen be made smaller.

As we see from Figures 1 and 2 and also from Figures 6 and 7 can recognize the possibilities of centering despite the achieved and described advantages are still limited. It is therefore sought the possibilities for swinging the rapier heads 3, 4 in the shed by improving the usual management elements limit. This applies in particular to the guidance of the gripper heads 3, 4 on the warp threads 2 of the individual compartment levels 21, 22, 23, 24. can the guidance on the warp threads in connection with the guidance of the hook heads 3, 4 with the guide rails 36, 46 on the reed almost are positively designed, are the possibilities for vibration the gripper heads 3, 4 can be clearly restricted.

For this purpose, first the compartment size of the reduced form and Size of the gripper heads 3, 4 adjusted. Furthermore, you have to make sure that significantly more warp threads than previously common in the process of guiding the gripper heads 3, 4 are included.

For this purpose, the gripper heads 3, 4 have in the area of the centering sleeve 31 and clearly in the area of the bearing 42 for the centering pin 41 enlarged guide surfaces 313 and 421 for the warp threads 2 of the adjacent ones Shelf levels 21, 22, 23, 24. These guide surfaces 313, 421 have such a length that at the same time a sufficient number of Warp threads 2 are involved in guiding the rapier heads 3, 4. Moreover these guide surfaces are wide and with optimally designed run-on slopes provided for the warp threads.

The warp threads 2 have a leading and also a for the rapier heads the vibrations of the same damping function. The warp threads 2 can with their elastic force, the gripper heads 3, 4 securely on the webs of the Guide reed 1.

The manner in which the warp threads are guided is shown in FIGS. 3 and 4 for different gripper head shapes. It is clearly too recognize that the gripper heads 3, 4 and 5, 6 at obviously the smallest Friction can be guided almost positively in your shed.

As shown in FIG. 3, the centering 31, 41 is located laterally outside of the cross-sectional area of the gripper bars 3, 4, their Dimensions can be chosen relatively small. They reach the top management inside and thus ensure small compartment opening angles and a relative small stroke of the sley 1 at the weft.

4 is a variant of the present Invention shown, in which the centering 51, 63 approximately coaxial to the axis the gripper rods 30, 40 is arranged. While maintaining the size the means 63 (similar to 33) for performance and the means catch hook 53 (similar to 43) - to take over the weft thread 9 one reaches approximately the same opening angles and the same stroke sizes for the weft thread stop using a drawer.

The execution of a to the gripper rods 30, 40 and the means for Transfer and takeover coaxial centering is shown schematically in Fig. 5 shown. The gripper 6 is in the cross-sectional area of the gripper bar 40 equipped with means 63 for presenting the weft thread 9. This Means 63 are provided in the front area with a centering tip 631, which takes effect earlier than the transfer area. The slave gripper 5 is provided with a centering sleeve 51, the one Bore 511 and an input area 512 coaxial to the desired Path of the gripper 6 has.

The entrance area 512 of this centering sleeve 51 is at a clear distance arranged in front of the tip of the catch hook 53 and ensures together with the centering tip 631 of the carrier gripper 6 - here on the means 63 arranged for presentation - for centering the grabber 6 for Slave gripper 5 or vice versa. This can also be done with this version mutual play between the catch hook 53 and the guide elements the means 63 for presenting the weft thread 9 is very small be carried out.

The advantage of this variant is that almost all Elements of the gripper heads 5, 6 on the longitudinal axis of the gripper bars 30, 40 can be aligned. This is particularly important when entering the rapier heads 5, 6 noticeable in the shed where the rapier rods 30, 40 are heavily loaded under pressure and the risk of buckling the gripper rods 30, 40 is given.

The centering sleeve 51 is in this embodiment with a side Provide recess in which the weft thread 9 can be guided. Furthermore, the outside area in the section that the reed faces, be provided with a sliding surface 513. In this case can be on additional guide rails 36, 46 - as shown in the figures 1 and 2 were shown - waive. The mass of the gripper heads 5, 6 can be kept low in this version. Another downsizing the shed is compared to that described at the beginning However, it is hardly possible to implement an embodiment variant.

Figures 6 and 7 show the same working elements as Fig. 1. One separate description of this figure is not required. The way of working and the structure are based on the description formulated for FIG. 1 became easy to understand.

The essence of the present invention is that the gripper heads 3, 4; 5, 6 almost form-fitting in a very limited shed, so the natural deviations of the gripper heads per se on one Minimum are reduced.

The remaining deviations are indicated by the centering 31, 41; 51, 63, 631 almost completely balanced, so that the means 33; 63 or 43, 53 to perform and take over with each other with the smallest play and smallest dimensions can be designed.

To improve the smoothness and possibly to increase the weft insertion rate the centering elements 31, 41, 41 'at least transverse to mutual direction of movement formed elastically. That has the Advantage that the mutual encounter of the gripper heads 3, 4 resulting impulses do not deflect the entire gripper head from the path, but only a part with much less mass. It is also expedient to dampen the impulse in the development phase, so that a mutual encounter and the desired centering can run under optimal conditions. embodiments show the figures 8 to 10.

In FIG. 8, the input area 312 is a centering sleeve 31 with a centering sleeve 314 provided. The centering sections 3141 are elastic and damping connected to the rigid part of the centering sleeve 314. Your Mobility is ensured by several slots 3142.

9 shows an elastic and damped design of the tip 412 a centering pin 41. The tip 412 is with a tip shaft 4122 provided, which is slotted at its free end and locking projections having. An outwardly widened hole in the shaft of the centering pin 411 gives the necessary lateral freedom of movement. A rubber ring 413 ensures the damping and positioning of the tip 412 in the unloaded Status.

10 shows an embodiment of the damping, the Centering pin 41 mounted on the gripper head 4 in an elastic and damped manner is. The centering pin 41 'here consists of a tubular shaft 411 '. A tip 412 'is used with limited elasticity. The The tubular shaft 411 'in the bearing 42 is form-fitting only in the front area guided. In the rear area there is a foam ring 423 or Radially elastic spring washer for centering in the unloaded state and for a damped elastic deflection of the centering pin 41 '

LIST OF REFERENCE NUMBERS

1

reed

2

warp

21

upper level

22

upper, middle subject level

23

lower, middle subject level

24

lower subject level

25

Cloth edge

26

double-pile

3

Gripper head / head Bringer

30

gripper bar

31

Centering, centering sleeve

311

drilling

312

entrance area

313

guide surface

314

Centering sleeve, elastic

3141

centering

3142

slots

32

coupling section

33

Means for presentation (stop, clamp)

34

chipboard

35

screw

36

guide rail

4

Gripper head, slave head

40

gripper bar

41, 41 '

Centering, centering pin

411, 411 '

shaft

412, 412 '

top

4121

tip shape

4122

tip Sleeve

413

rubber ring

42

camp

421

guide surface

422

coupling section

423

Foam ring, spring ring

43

Takeover means

431

driving hook

432

clamping slide

44

chipboard

45

screw

46

guide rail

5

Gripper head, slave gripper

51

centering

511

drilling

512

entrance area

52

coupling section

53

Driver hook (means to take over)

6

Gripper head, bringer gripper

61

camp

62

coupling section

63

Means of performance

631

centering

9

weft

Claims (10)

Weft insertion element on weaving machines with fixedly arranged supply spools in the area of a fabric edge,
with rapier rods that engage in a shed from both sides of the fabric and move against each other,
with gripper heads on the gripper rods, designed as a delivery head or as a delivery head, which in the middle pass a weft thread presented by the delivery head to the delivery head,
with means on the delivery head for grasping a weft thread at the edge of the fabric and for presenting this weft thread in the center of the compartment,
with means for taking over and clamping the weft thread presented by the delivery head on the slave head,
with bevels on the means for presenting and taking over the weft thread to limit the risk of collision between the delivery head and the delivery head,
with guide surfaces on each rapier head for guiding the same on the warp threads delimiting the shed and
with guide rails on each rapier head for guiding it on the lamellas of the reed,
characterized in that the bringer head (3; 6) and the slave head (4; 5) are equipped with mutually interlocking interlocking parallel to the direction of movement and provided with run-in slopes (e.g. centering pin 41; 631, centering sleeve 31; 51) and
that the centering means (41, 31; 51, 631) of the means for presenting (33; 63) and accepting (43; 53) the weft threads (9) in the direction of movement of both hook heads (3, 4; 6, 5) at the beginning of their encounter in the center of the shed (2) are mutually centering. Weft insertion element according to claim 1, characterized in that the guide surfaces (313, 421, 313 '421') for guiding the hook heads (3, 4; 5, 6) close to the warp threads (21, 22, 23, 24) delimiting the shed can be positioned when the guide rails (36, 46) slide on the reed (1) and
that the guide surfaces (313, 421, 313 '421') are provided with run-up slopes for the warp threads (21, 22, 23, 24) in each direction of movement of the hook heads (3, 4, 5, 6). Weft insertion member according to claim 1 or 2,
characterized in that the centering provided with run-in bevels (e.g. centering pin 41; 631, centering sleeve 31; 51) are designed or supported at least transversely to the direction of movement and
that the centerings (41, 31; 51, 631) consist of damping materials or damping elements (centering bush 314; rubber ring 413; foam ring 423) are assigned to them. Weft insertion member according to claim 1 or 2 and 3,
characterized in that the centerings (41, 31; 51, 631) consist of a cylindrical centering pin (41, 63) with a tip (412; 631), which has a bearing (42; 61) on the first gripper head (4; 6), and consist of a centering sleeve (31; 51) with a cylindrical bore (311; 511) and an inwardly tapering input area (312; 512) on the second gripper head (3; 5). Weft insertion member according to claim 1 to 4,
characterized in that the guide surfaces (313, 421, 313 '421') are designed for the sliding of the hook head on the warp threads on the outside of the centering sleeve (31; 51) and on the bearing (42; 61) of the centering pin (41; 63) are. Weft insertion member according to claim 1 and 2,
characterized in that the centerings (41, 31; 51, 631) of the means for presentation (33; 63) and takeover (43; 53) are arranged on the side of the compartment tip, laterally adjacent and
that the means for presentation (33; 63) on the bringer head (3; 6) and the means for taking over (43; 53) on the slave head are arranged in the cross-sectional plane of the gripper bars (30, 40). Weft insertion element according to claim 1, characterized in that the gripper heads (3, 4; 6, 5) are designed such that the center of gravity of the respective gripper head is approximately in the region of the longitudinal axis of the gripper rod (30, 40). Weft insertion member according to claims 1 to 6,
characterized in that the centering pin (41) is arranged on the slave head (4) and the centering sleeve (31) on the delivery head (3). Weft insertion member according to claims 1 to 7,
characterized in that the gripper heads - the feeder head (3; 6) and the slave head (4; 5) - each consist of a molded plastic part,
that the molded plastic part includes a coupling shaft which is positively connected to the end of the gripper bar, one part each the centering elements and the recordings for the means of performance or takeover. Weft insertion element according to claim 1, characterized in that the centerings (51, 631) are arranged coaxially to the longitudinal axis of the gripper rods (30, 40).

Images