EP0093078B1 - Linear shed multiphase weaving machine with a weaving rotor - Google Patents

Abstract

A weaving rotor carries lamellae combs, the lamellae of which are provided with shed-retaining elements. Shedding rods which are stroke-wise displaceable in the warp direction are positioned forwardly of the weaving rotor to allocate each warp thread to a shed-retaining element determining either an upper shed or a lower shed. The shedding rods are formed by first racks, the tooth spaces or gaps of which serve as guide means for the warp threads. Thus, there is ensured as precisely as possible pitch or division of the guide means for the warp threads as well as an accurate reproducibility for the shedding rods. The lamellae are positioned on the weaving rotor by second racks having the desired pitch. The first and second racks correspond to each other and are identically designed. Consequently, there results the highest conformity between the lamellae pitch and the pitch of the warp threads, and thus, an optimally ordered run or course of the warp threads from the shedding rods to the weaving rotor. Additionally, manufacture and operation of the multiple longitudinal traversing shed weaving loom are rendered more economical.

Description

The invention relates to a row shed weaving machine with a weaving rotor which has the warp threads holding the warp threads in their up or down position in a predetermined way, and with a control means arranged in the running direction of the warp threads in front of the weaving rotor for lateral deflection and assignment of each warp thread to a or a compartment holder which fixes down deep, which control means has compartment forming rods which extend in the weft direction and are adjustable in this direction.

In a row shed weaving machine of this type known from US Pat. No. 4,291,729, the shed forming rods are provided with guide eyes for the warp threads. It has been shown that during the manufacture of these shed rods, namely when the guide eyes for the warp threads are attached, irregularities in the mutual spacing, the so-called division, of these guide eyes occur again and again. These irregularities lead to two undesirable disadvantages. Firstly, they ensure that the warp threads from the shedding bars to the weaving rotor do not run strictly parallel, which makes the correct reading of the warp threads into the weaving rotor not insignificantly difficult, and secondly, they add up over the weaving width to a sum error, which with a usual weaving width of about 2m is on the order of millimeters.

If one considers that on such row shed weaving machines, fabrics with a warp density of up to 40 warp threads per centimeter and more are to be produced, then it is clear that a sum error of the order of magnitude mentioned can lead to the warp threads guided by different shed rods at the location of the reading are not arranged in the correct mutual assignment in the web rotor and not in the correct assignment to the web rotor. In practice, however, this means that the warp threads are not correctly read into the weaving rotor and faulty fabric is produced.

The invention is intended to specify shed rods in which the irregularities mentioned between the guides for the warp threads and in particular the sum errors no longer occur, so that an error-free reading of the warp threads into the weaving rotor is guaranteed.

According to the invention, this object is achieved in that the shedding bars are formed by first toothed racks, the tooth bases of which serve as guides for the warp threads in the interdental spaces.

Since such racks are known to be manufactured on special machine tools, the pitch accuracy of their teeth is far superior to that of the guide eyelets of the known specialist racks and it can be assumed that the irregularities and irregularities mentioned no longer occur. In particular, any cumulative error is excluded, and at most deviations within the individual tooth pitches could occur due to the machine tool itself. In any case, these would be negligibly small and, in addition, the same size for all toothed racks machined on the same machine tool and therefore without influence. The racks are therefore exactly reproducible and exactly the same among each other.

A preferred embodiment of a row shed weaving machine according to the invention with lamella combs containing the shed retaining elements and each arranged on a carrier, the lamellae of which are positioned on their carrier by a positioning element in the form of a second toothed rack extending over the weaving width, is characterized in that the tooth pitch of the first toothed racks is that of the corresponds to the second rack.

The first and the second toothed racks preferably correspond to one another and are of identical design.

As a result, the same elements can be used for shed formation and for the positioning of the slats, which on the one hand guarantees the best match between the division of the slats and that of the warp threads and thus an optimally ordered course of the warp threads from the shed guide bars to the weaving rotor and on the other hand both the production and the Operation of the row shed weaving machine according to the invention cheaper.

• Figur 1 eine stirnseitige Ansicht eines Trägers mit zwei Lamellenkämmen in vergrössertem Massstab,
• Figur 2 eine Ansicht in Richtung des Pfeiles 11 von Fig. 1,
• Figur 3 eine schematische perspektivische Darstellung des Trägers von Fig. 1 mit drei darauf zu montierenden Lamellen,
• Figur 4 eine schematische Ansicht in Richtung des Pfeiles IV von Fig. 1,
• Figur 5 eine schematische Ansicht in Richtung des Pfeiles V von Fig. 4, und
• Figur 6 einen Querschnitt durch zwei Fachbildestangen.

Below we explain the invention with reference to an embodiment and the drawings. Show it :

• FIG. 1 shows an end view of a carrier with two lamellar combs on an enlarged scale,
• FIG. 2 shows a view in the direction of arrow 11 from FIG. 1,
• 3 shows a schematic perspective illustration of the carrier from FIG. 1 with three slats to be mounted thereon,
• FIG. 4 shows a schematic view in the direction of arrow IV of FIG. 1,
• Figure 5 is a schematic view in the direction of arrow V of Fig. 4, and
• Figure 6 shows a cross section through two shedding rods.

Figures 1 to 3 show a lamella comb for the weaving rotor of a series shed weaving machine, which consists of a carrier 1, a stop comb 2 and a guide comb 3, both combs are shifted by half a pitch. The structure and mode of operation of a series shed weaving machine with a weaving rotor are assumed to be known and are not explained in more detail here tert: in this connection reference is made to US Pat. No. 4,291,729.

Since in principle any known weft insertion system can be used on a row shed weaving machine and the lamella comb shown is not limited to a specific weft insertion system or is specific for this, this will not be discussed either. For a particularly suitable weft insertion system with air, reference is made to the CH patent application 1 039 / 82-7 by the applicant of the present application.

According to FIGS. 1 to 3, the stop comb 2 consists of stop slats 4 for striking the weft threads and the guide comb 3 consists of guide slats 5 for the warp threads K. The guide slats 5 are provided with shed retaining elements which fix the up or down position of the warp threads and the warp threads over hold the entire wrap angle on the weaving rotor in its up or down position.

In Fig. 2, in which the individual fins are drawn in an exaggerated thickness, the tube between two adjacent guide fins 5 is designated B and that between two adjacent stop fins 4 is designated C. It can be seen that the two fin combs 2 and 3 (FIG. 1) with the fin 4 and 5 are mutually displaced by half a pipe width. As shown, there are two warp threads K in each tube of each of the two lamella combs, in the tube B between two guide lamellae 5 both warp threads K are located together either in the up or down position, in the tube C between two stop lamellae 4 there is a warp thread K in each case in the high and the other in the low position. This representation corresponds to a double-stitch plain weave.

The compartment-holding members for the warp threads K are formed by projections projecting laterally from the guide slats 5. Each guide plate 5 is provided with a first projection 6 or 6 'serving as a compartment holding element for the high position and with a second projection 7 or 7' serving as a compartment holding element for the low position. The first projection 6, 6 'is formed by a bent portion on one edge of the guide slats 5, the second projection 7, 7' is formed in that a type of window is punched out of the guide slats 5 on three edges and bent around its fourth edge is. Since the compartment-holding members for the up and down compartments are always arranged in different tubes, the first and second projections 6, 6 'and 7, 7' respectively project away from the guide plates 5 on different sides.

Each compartment-holding member is formed by two first or second projections 6, 6 'or 7, 7' arranged on the guide fins 5 delimiting the respective tube. The two projections, each forming a compartment-holding member, project against one another (FIGS. 2, 3) and are offset with respect to one another in the warp direction, which corresponds approximately to the direction of the arrow 11 in FIG. 1. The aforementioned lamella comb 3 is thus composed of two types of guide lamellae 5: from guide lamellae 5 with a first projection 6 in the weft direction A and with a second projection 7 in the weft direction A and from guide lamellae 5 with a first projection 6 'in the weft direction A and with a second projection 7 'against the firing direction A.

The carrier 1 for the lamellar combs 2, 3 (FIG. 1) consists, as shown, of two parallel rails 8 and 9, which extend over the weaving width, one of which is provided with a dovetail 10. The dovetail 10 is provided for insertion into a corresponding groove on the casing of the weaving rotor (not shown). The rail 8 carrying the dovetail 10 is provided with threaded holes 11 distributed over its length at intervals of approximately 3 to 10 cm, into each of which a countersunk screw 12 is screwed, which protrudes with one end from the rail 8 and against the rail 9 presses. By turning the screws 12, the distance between the two rails 8 and 9 and thus the cross section of the carrier 1 can be adjusted.

Each lamella 4 and 5 has two fastening legs 13 or 14 which enclose a mouth 15 and 16 which partially surrounds the rails 8 and 9. The mouth 15, 16 of each lamella 4 and 5 is delimited at the end of each fastening leg 13 and 14 by a projection 17 and 18, respectively. The projections 17 and 18 are provided for latching on two diagonally opposite edges of the two rails 8 and 9. The width of the mouth 15 and 16 and the cross section of the rails 8 and 9 are dimensioned such that when the screws 12 are loosened, that is to say when the two rails 8 and 9 are at a small mutual distance from one another, the slats 4, 5 with the fastening legs 13 and 14, respectively, over the Rails 8, 9 inserted and can then be fixed by adjusting the screws 12. Each carrier 1 formed by the rails 8, 9 carries two lamella combs 2 and 3 (FIG. 1) displaced relative to one another by half a pitch or tube width B or C with stop lamellae 4 or guide lamellae 5.

The slats 4, 5 are positioned on the rails 8, 9 with the aid of rod-like members which are arranged parallel to the support 1 and are provided with guide means for the slats, the division of the guide means corresponding to the desired division of the slats. These organs are formed by toothed racks, the teeth of which have the desired division and a triangular or trapezoidal profile and are embedded in the carrier 1.

As shown, the rod 9 is in its Provide the inner edge of the fastening leg 13 or 14 adjacent outer surface perpendicular to the screws 12 with two parallel longitudinal grooves 19 and 20 and the rod 8 has a longitudinal groove 21, 22 on each of its two side surfaces parallel to the screws 12. Each of the grooves 19 to 22 is provided for receiving a rack 23 to 26 extending over the entire length of the carrier 1 and thus over the weaving width, and between the bottom of each groove 19 to 22 and its rack 23 to 26 is an elastic insert, as shown a rubber cord 27 to 30 of about 2 mm in diameter is arranged.

For each lamella comb 2, 3 (Fig. 1), a pair of racks 23, 26 and 24, 25 is provided, in which the lamellae 4 or 5 are each guided in the region of their two projections 17 and 18. On the inner edge of their inner leg running perpendicular to the screws 12, the lamellae 4, 5 each have a gradation 31 or 32, with which they grip around the toothed rack 24 or 23 assigned to the other lamella 5 or 4 from the outside and therefore not in Contact with the toothing projecting outwards from the carrier 1.

The depth of the grooves 19 to 22, the height of the toothed racks 23 to 26 and the height of their toothing and the thickness of the rubber cords 27 to 30 are coordinated with one another in such a way that the teeth of the toothed racks before the slats 4, 5 are fitted onto the carrier 1 slightly protrude the side surfaces of the rails 8, 9 provided with grooves 19 to 22. As a result, the slats 4, 5 are pushed against the pressure of the rubber cords 27 to 30 and these press the toothing of the toothed racks 23 to 26 fully against and between the slats 4, 5, as a result of which they are always securely positioned.

4 shows, on the basis of a schematically illustrated processing of two guide combs 3 and 3 ₁ and a stop comb 2 arranged between them, the reading in of the warp threads K into the lamellar combs, the first and second projections 6, 6 'and the overlapping parts forming the overlapping members being overlapping one another 7, 7 'are particularly well recognizable. The warp threads K are guided in the running direction of the warp threads in front of the lamella combs 2, 3 and thus in front of the weaving rotor, shed forming rods 33 and 34 and run from these to the lamella combs. The upper half of the weaving rotor rotates away from the shed forming rods 33 and 34, which means, in relation to FIG. 1, a clockwise rotation. It is again assumed that the double-stitch plain weave shown in FIG. 2, that is, each warp thread K is alternately in the high or low position from guide comb to guide comb 3. As a result, if the warp density permits, only two shed forming rods 33, 34 are required, which always perform an opposite movement.

According to the illustration, the guide comb 3 and the stop comb 2 are fully immersed in the warp threads K and the guide comb 3 ₁ will soon be immersed in the warp threads 4, the warp threads K located in the guide comb 3 in the high compartment in the deep position and the warp threads K in the deep position Higher position should come.

To achieve this, the shedding bars 33, 34 have been moved by their drive so that the warp threads K assume the positions shown. The warp threads K guided by the shedding rod 33 were moved to the left and the warp threads K guided by the shedding rod 34 were moved to the right until they rest against the stop lamella 4 delimiting their tube on the left or right. In this way, the guide lamellae 5 can enter between two pairs of spreading warp threads K into the warp thread sheet, two of these spreading warp threads K always in a tube of the guide comb 3 ₁ with first compartment holding members 6, 6 'for the high position and the other two ir ^{i get} one with second compartment holding members 7, 7 'for the deep compartment. When the next following lamella comb enters the warp threads K, the shedding bars are moved in opposite directions. The shed rod 33 to the right in the direction of arrow B and the shed rod 34 to the left in the direction of arrow C.

The adjustment path of the shed rods 33 and 34 between the two warp thread positions appears in Fig. 4 because of the scale and the exaggerated thickness of the fins 4 and 5 as well as the tube widths also drawn too large in the fin combs 2 and 3 much larger than in reality where this adjustment range is a few millimeters and is usually well under ten, namely around one to three millimeters.

5 are formed by toothed racks which correspond to the toothed racks 23 to 26 which position the slats 4, 5 (FIG. 3). Such toothed racks are easy to manufacture and, as a particular advantage, do not have any cumulative errors that negatively influence the pitch of the teeth over the entire weaving width. If the shedding bars 33, 34 were provided with bores or eyelets for guiding the warp threads, then these errors would very likely occur, but they are practically impossible with racks. Only an error in the machine tool on which the toothing was produced could have an effect here. On the one hand, this is very unlikely and, on the other hand, still has no influence, because such an error would be the same for all racks of a production lot.

In the illustrated distribution of the warp threads K with two warp threads per tube, two is used. Fachbildestangen 33, 34 a warp thread between two teeth. When the total number of teeth of all shed bars Is several times the number of warp threads K, then of course not all the spaces between the teeth are covered with warp threads. If there are n times as many teeth as warp threads, there is only one warp thread in every nth space. Here, the division of the dentists could be chosen accordingly larger.

However, it is more advantageous to choose the same toothed racks as for the lamellae 4, 5 for the shed forming rods and to cover only every nth tenth with a warp thread K and, if necessary, to carry out this tenth more deeply and / or widened.

While FIG. 5 shows the racks 33, 34 in a schematic development, which is primarily intended to help understand the arrangement, FIG. 6 shows the effective arrangement of the racks 33, 34 on the weaving machine. According to the illustration, each of the toothed racks 33, 34 extending over the weaving width is firmly embedded in a carrier rod 35 and 36 also extending over the weaving width. The carrier rods 35, 36 are connected at one end to a drive (not shown), which can be formed, for example, by an output member of a dobby or by a lever driven by an eccentric disk or drum. Along their longitudinal edge, which is more distant from the toothed racks 33, 34, the support rods 35, 36 are slidably mounted in recesses 38 of fork-like or rake-like support members 37 which extend around this longitudinal edge and are arranged distributed over the weaving width.

The support rods 35, 36 are arranged one above the other in such a way that the bottom of each support rod covers the toothing of the toothed rack immediately below. The toothing of the uppermost rack, according to the illustration the rack 33, is covered by a cover rail 39 carried by the support members 37. In this way, the warp threads K cannot jump out of the toothing of their rack 33 or 34. The support members 37 are provided with a number of recesses 38 corresponding to the possible total number, for example twelve, of the support rods 35, 36, each of which is occupied by the required number of support rods 35, 36.

If one arranges the toothed racks 33, 34 in such a way that they deflect the warp threads K out of their straight course, then one could do without covering the toothing. If the toothing protrudes upwards as in FIG. 6, the toothed racks 33, 34 would have to deflect the warp threads between the last deflecting roller in front of the toothed racks and the weaving rotor upwards, with the toothing projecting downwards correspondingly downwards. Then the warp threads would each be deflected through the toothing and could not jump out of it either.

Claims (6)

1. A traversing shed weaving machine having : a weaving rotor which has shed-retaining elements retaining the warp yarns in their top-shed or bottom-shed position over a predetermined distance ; and a control facility which is disposed before the rotor as considered in the direction of warp yarn movement and which is operative to produce a lateral deflection and association of each warp yarn relatively to a shed-retaining element determining the top shed or bottom shed, the control facility having shedding bars which extend in the picking direction and whose operative movement is adjustable in such direction, characterised in that the shedding bars are in the form of first toothed bars (33, 34) having teeth whose bases in the tooth spaces are operative as guides for the warp yarns (K).

2. A machine according to claim 1 having lamella combs which comprise the shed-retaining elements and are each disposed on a carrier, the lamellae of the combs being located on their carrier by a locating element in the form of a second toothed bar which extends over the weaving width, characterised in that the tooth pitch of the first bars (33, 34) corresponds to the tooth pitch of the second bars (23-26).

3. A machine according to claim 2, characterised in that the first bar (33, 34) and the second bars (23-26) correspond to one another and are identical.

4. A machine according to claim 3, characterised in that when a warp yarns (K) are reeded into b tubes of each lamella comb (2, 3) and when c first bars (33, 34) are used, c being greater than a; only so many toothed spaces are occupied by a warp yarn that the product of the number of these occupied tooth spaces and c equals a times b, and the tooth spaces are marked by constructional means, preferably by a special tooth shape.

5. A machine according to claim 3, characterised in that the first bars (33, 34) are displaceably mounted in guide elements (37) disposed over the weaving width and covering means covering the tooth system of every first bar are associated therewith.

6. A machine according to claim 5, characterised in that every first bar (33, 34) is carried by a carrier bar (35, 36) mounted in the guide elements (37), and the carrier bars are disposed one above another and covers the associated bar with one surface and the tooth system of the adjacent bar with the other surface.

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