CZ20004615A3 - Apparatus for producing gauze weave fabrics on a weaving machine - Google Patents

Abstract

The invented apparatus for producing gauze weave fabrics on a weaving machine produces a gauze weave by mutual lateral offset of a first heald frame (3) with a bottom needle ridge (4) and a second heald frame (5) with an upper needle ridge (6) through the mediation of a second and fourth eccentrics (7, 8) and by making shed by a first and a third eccentric (1, 2).

Description

Technical field

BACKGROUND OF THE INVENTION The present invention relates to an apparatus for producing fabrics in leno weave on weaving machines.

BACKGROUND OF THE INVENTION

Up to now, fabrics in leno-weave have been produced on the devices described below. The warp threads are guided in special leno healds, which are made up of three parts. The two parts are half-cushions, which are hung on the adjacent heald leaves and between them a single warp thread is guided. The third part is the heald itself with the loop through which the second warp thread is guided. This third part is locked into both half-boards and is pressed into contact with the half-boards by springs over bars on which the heald itself is threaded. This device puts a relatively high strain on the warp threads and does not allow operation at a higher operating frequency. The price of healds is high and the service life is low.

The warp threads are guided into two needle combs carried in the frame frames which perform counter-rotating movements. One needle comb is pivotally mounted in the frame, allowing it to vary a predetermined position relative to the needle bar fixed in the frame. The disadvantage of this solution is the necessity of large lateral movement of the movable needle comb and insufficient stiffness of the mechanism. For this reason, the operating frequency of the device is low.

One set of warp threads is guided into the needle comb and the other set into angled grooves in the slat sheet. In this arrangement, the warp yarns must be guided into the needles through a bar so that they are bent twice by 90 °, causing a high wear of the yarns. The second set of threads, guided into the oblique grooves, performs lateral movement by means of a movable bar which alternately pushes the warp threads to the left-right side. The needle comb is driven by a special cam mechanism. The disadvantage of this device is, besides the already mentioned stress of the warp threads, a high price.

SUMMARY OF THE INVENTION

These drawbacks are largely overcome by the device according to the invention for producing fabrics in leno weave on a weaving machine. The apparatus includes a first frame with a lower needle comb and a second frame with an upper needle comb and an eccentric shed device. It is an object of the present invention to provide a first frame with a lower needle ridge and a second frame with an upper needle ridge mounted on a weaving machine with both a reciprocating vertical movement to form a shed and a reciprocating lateral movement to cross the warp threads. Each of the frames is connected via at least one first lateral movement hinge mechanism and at least one second vertical movement hinge mechanism to the shed device. The device imparts a reciprocating lateral movement and a reciprocating vertical movement to both the first and second brake frames, the first and second brake frames moving in opposite directions.

The advantage of the device is less lateral movement of the brake frames, greater rigidity of the whole mechanism and higher working frequency.

Advantageously, the eccentric shed device comprises a first eccentric and a second eccentric, which are connected by a first articulation mechanism and a second articulation mechanism to the first brake frame to move it for reciprocating lateral movement and reciprocating vertical movement, and on the other hand a third eccentric and a fourth eccentric. which are connected by means of a first articulation mechanism and a second articulation mechanism to a second cam frame for bringing it into reciprocating lateral and reciprocating vertical movement.

A further advantageous solution of the device is characterized in that at least one of the first hinge mechanisms of the lateral movement comprises a split rod for adjusting the relative position of the first and second brake frames connected to the other elements of the first hinge mechanisms by the first and second hinges. The second hinge is a split linkage connected to the frame, the first hinge to other kinematic elements of the first hinge mechanism.

The split rod allows adjustment of its length so that the relative position of the lower needle comb and the upper needle comb ensures a secure crossing of the warp threads.

Preferably, the first split rod joint is located at a position corresponding to the stroke center of the second split rod joint.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be explained in more detail with reference to the drawings, in which: FIG. Fig. 2 shows a kinematic diagram of a drive, a second cam frame with an upper needle rack.

FIG. Needle combs are also shown.

Examples • ·. · .. ··· ·· ··

FIG. 1 shows a kinematic diagram of a drive, a first cam frame 3 with a lower needle rack 4, which consists of an eccentric shed device 15 equipped with four eccentrics 1, 2, and 7, and 8. The first eccentric 1 imparts movement through the second articulation mechanism 14 to the first cam frame 3 in the vertical direction "A" and "B", while the second eccentric 7 imparts lateral movement towards the first cam frame 3 via the first articulated mechanism 13, and "L" and "P". The split linkage 9 is connected to the first hinge mechanism 13 by a first hinge 16, while its second joint 18 is connected to the first frame 3. The split linkage 9 is adjustable in length, the length of the linkages being secured by the screw 11.

Fig. 2 shows the kinematic diagram of the drive of the second cam frame 5 with the upper needle rack 6. The eccentric shed device 15, by its third eccentric 2, imparts ^a movement via the second articulation mechanism 14 ^z to the second cam frame 5 in the vertical direction "A" and "B", while the fourth eccentric 8 imparts the second cam frame 5 via the first articulation mechanism 13 ^z split rod 10, lateral movement towards "L" and "P". The second split linkage 10 is connected to the first hinge mechanism 13 ^z by a first joint 16 ^z while its second joint 18 ^z is connected to the second cam frame 5. The second split linkage 10 is adjustable in length, the set length of the second split linkage 10 being secured by the first securing screw 1 l ^of a ¹² In operation, the loom eccentric shedding device 15 has a first _excentrem 1 and the third cam 2 grants via second link mechanisms 14 and ¹⁴ constituted by levers, connecting rods, angular levers lions, angular levers true, and the line connecting the movement of the first and a second cam frame 3 and 5 with a lower 4 and upper needle comb 6, so that the warp threads 20 and 21 form in the overlapping position of the lower 4 and upper needle comb and 6 the shed for weft picking 22. During further machine movement the first eccentric 1 and third eccentric 2, move the first frame 3 and the second frame 5 to the lower position 4 and the upper needle comb 6 are spaced apart and the second eccentric 7 and the fourth eccentric 8 by means of the split rods 9 and 10 move the first frame 3 and the second frame 5 into the.

opposite extreme positions. The first and second frame 3 and 5 are guided by non-illustrated ridges in a plane perpendicular to the directions of movement "A" and "B", which allow movement in the "A" and "B" directions as well as the "L" and "P" directions. The length of the split rods 9 and 10 is adjusted such that the relative position of the lower and upper needle ridges 4 and 6 ensures a secure crossing of the warp threads 20 and 21, the split rods 9 and 10 being retained in the first joints 16 and 16 ^z and the second joints 18 a. 18 ^z, wherein the first joints 16 and 16 ^z are situated at a position corresponding to the half stroke of the second joints 18 and 18 ^Z.

Again, the lower 4 and upper needle combs 6 are successively crossed and the shed of the warp yarns 20 and 21 is formed with their opposite position relative to each other. The weft weft 22 is again pinned to the fabric face and the altered position of the warp yarns 20 and 21 is secured therewith. The whole process is repeated in this process to form a fabric with a leno weave 23.

Claims (4)

PATENT CLAIMS An apparatus for producing fabrics in a leno weave on a weaving machine, comprising a first frame (3) with a lower needle ridge (4) and a second frame (5) with an upper needle ridge (6) and an eccentric shed device (15), characterized by characterized in that the first frame (3) with the lower needle ridge (4) and the second frame (5) with the upper needle ridge (6) are mounted on the weaving machine both with the possibility of reciprocating vertical movement, to form a shed and a reversible side a movement, to cross each other the warp threads, each of which is connected via at least one first side hinge mechanism (13, 13, ⁷ ) and at least one second vertical hinge mechanism (14, 14 ^z ), to the shed device (15) adapted to impart reciprocating lateral movement and reciprocating vertical movement to both the first frame and the second frame (5), the first frame the frame (3) and the second frame (5) move in opposite directions. Device according to claim 1, characterized in that the eccentric shed device (15) comprises, on the one hand, a first eccentric (1) and a second eccentric (7) which are connected by means of a first hinge mechanism (13) and a second hinge mechanism (14) to a first cam frame (3) for actuating the reciprocating lateral movement and reciprocating vertical movement and a third eccentric (2) and a fourth eccentric (8) which are connected by a first articulation mechanism (13 ^z ) and a second articulation mechanism (14 ^z ) with a second cam frame (5) for bringing it into reciprocating lateral and reciprocating vertical movement. • * # 4 ** ** 4 4 141 141 141 Apparatus according to claim 1 or 2, characterized in that at least one of the first lateral movement mechanisms ( ^{13, 13, 7} ) comprises a split rod (16, ¹⁷ ) connected by a first joint (16, 16, ⁷ ) and a second joint ( ^{18, 18, 7} ). 9, 10), for adjusting the relative position of the first brake frame (3) and the second brake frame (5), the second joint ( ^{18, 18} ) of which the split rod (9, 10) is connected to the brake frames (3,5). 4. Apparatus according to claim 1, 2 or 3, characterized in that the first joint (16,16 ⁷⁾ divided by the rod (9, 10) is disposed at a position corresponding to the center of the stroke the second joint (18,18 ^7).