DE2044468A1 - Shedding device on a weaving machine - Google Patents

Description

1685 /

Dipl.-Ing. Dipl. Cj'ec. publ, " Q Qnn iQ7fl

DiEKICH LEWINSKY / °

PATENT ADVOCATE
8 Munich-21 - Gotthardstr. 81

Telephone 50 17 62

GEORG FISCHER AG. BRUGG , Brugg

Shedding device on a loom

The present invention relates to a shedding device on a weaving machine with weft insertion from a sehuss yarn storage bobbin located outside the shed, wherein the end of each weft thread is pulled over the fabric edge by a gripper.

Shuttleless looms are known for which The weft yarn is introduced into the shed with a bringer rapier and a taker rapier, which be introduced into the shed by a common drive from both fabric edges, the bringer rapier brings the weft yarn from a weft supply bobbin to approximately the middle of the fabric and there the gripper

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passes, which pulls it over the second half of the fabric when the gripper moves backwards. This is the weft thread either entered as a loop that slides over deflection points on the grippers, or there are clamping grippers used, which pull the weft thread with the point first through the shed.

in both cases it must be when the gripper gripper emerges from the shed a small piece of weft thread that passes over the nipping point or the deflection point of the gripper rapier protrudes, be pulled out over the selvedge. Since i & this point in time for certain entry systems or use cases the shed may already be closed or already crossed over ", there is the disadvantage that" the Piece of weft thread, especially if it is a heavily structured weft thread with knobs, flames or beads acts, there is great resistance between the warp threads, which leads to weft yarn strains and weft breaks can lead.

The object of the present invention is to create a device with which the said Have difficulties resolved. It is particularly important that the weft thread just inserted is held in the shed by direct contact with the warp threads of the upper and lower shed, but the aforementioned, protruding beyond the gripper The end of the weft thread can still emerge unhindered,

The present invention is characterized by a rod-shaped member, which on the facing the weaving line Side of the taker and roughly parallel to it Web slidably guided in the longitudinal direction and to a back and forth movement synchronized with the weft insertion is driven, at which the apex of the organ

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each enters the open compartment and returns "trailing over regarding the tip of the gripper claw the edge of the fabric recedes.

In the drawing is an embodiment of the invention shown. Show it:

Fig. 1 shows the floor plan of a lot on a shuttleless Loom with the gripper and a shedding needle before exiting the Shed,

2a-c an elevation of the shedding device or the shedding needle in different phases of FIG cyclic movement of the needle point in the shed,

3a-c a schematic representation of the shed with different gripper divisions, according to line III in Fig. 1, and

Fig. 4- is a representation similar to Fig. 3, but according to line IV in FIG. 1.

As shown in FIG. 1, there is 1 on the left weaving machine plate a needle guide 2 attached with screws 3, which parallel to a guide 4 of the entry member 5 with the Gripper 6 is standing. One can also see a sley with a reed 8, a reed clamping strip 9 and also a loading support 10.

The warp threads 11 together with weft threads 12 form the Tissue 13. The weft thread 14 is inserted by the slave rapier 6, the end 16 of which via the clamping point 15 on Gripper 6 protrudes.

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In the needle guide 2, for example by means of self-lubricating bushes 17, is in a drive head 18 adjustably held shedding needle 19 guided to and fro in the direction of arrow 20. The long axis of the needle 19 is located approximately at the level of the gripper 6 and between this and the weaving line 34. The movement of the The needle is cyclically controlled with the weft insertion movement so that that it penetrates into the open compartment and then completely withdraws from it. The return movement the needle 19 is matched to that of the gripper gripper 6 so that the needle tip 21 is opposite the hook tip lags behind by a certain amount 22 and accordingly later goes back over the fabric edge. the Fig. 1 shows the situation just before the start of the needle return. The penetration depth of the needle 19 is approximately the same the length of the weft thread piece 16 plus the dimension 22. The dimension 22 can be about ig- - 1/3 of the length, depending on the type of yarn of the weft thread piece 16 amount.

Fig. 2a shows an elevation of the shedding device during the return of the needle 19. It is the attachment the needle guide 2 on the weaving machine plate 1 and an example of a drive for the needle can be seen. in the Drive head 18 engages a slide 24 of an angle lever 25 in such a way that the one not shown with the main shaft synchronized cam control via a push rod 26 transferred movement into a sliding movement the Fachbildenadel 19 is transformed. It would also be conceivable to use the Fachbildenadel in a different way and, for example, to have a swivel movement carried out.

In the position of the needle tip 21 shown in FIG. 2a this is located in the emerging from the warp threads 11 Phase. The warp threads 11 slide off the needle point 21 and meet thereon.

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- 5 - ■. ■.

204A

In the phase according to FIG. 2b, the needle tip 21 is above the Tissue edge 23 retracted and is approximately in the rearmost position. The warp threads 11 form a line, i.e. the compartment is closed; at most, the warp thread could already be crossed.

FIG. 2c shows the phase in which the needle point 21 retracts into the open shed formed by the warp threads 11 27 represents.

The Pig. 3a, b and c show a schematic representation of the shed in different phases of the weaving cycle. The warp threads 11 in the upper shed 30 and in the lower shed -31 lead through the strands 29 and through the reed 8 to the weaving line 34 and form the shed 27. From the weaving line 34, the fabric 13 runs through the temple 28, which is in pig. 1 is not shown for the sake of simplicity.

The gripper 6 is located at Pig. 3a still far in the open shed 27, and the shedding needle 19 has also penetrated into the shed 27.

In Pig. 3b a later movement phase is reached. Of the Taken gripper 6 with the weft yarn 14 and the weft thread piece 16 (end of the weft thread) is approaching the edge of the fabric 23. The warp threads 11 of the upper shed 30 and the lower shed 31 have approached each other. However, the weft yarn and the weft thread piece 16 are still exposed Shed 27.

Pig. 3c shows the phase immediately before the exit of the Gripper 6 from the shed 27. Pig. 4 illustrates the situation at the same time as Pig. 3c, but on the position of the line TV (Pig. 1), i.e. in the area of the Measure 22 between the end of the gripper and the

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Tip 21 of the shedding needle 19. The warp threads 11 of the upper subject 30 and lower subject 31 have already crossed. As a result, the weft yarn 14 is in direct contact with the warp threads at the crossing point 32 (FIG. 4) 11 and is thereby fixed. However, there is still a cavity between the gripper 6 and the shedding needle 19 33, i.e. a kind of open compartment in which the piece of weft thread 16 can move freely. Since this Weft thread end 16 after the gripper 6 from the shed 27 occurs, it is important that the tip 21 of the shedding needle 19 is offset with respect to the gripper gripper 6 is.

Thanks to the device described, it is possible to produce structured yarns with knobs, flames or beads without hindrance over the leading edge. to pull out.

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Claims (1)

Godfather η tans ρ r ü c he Paching device on a weaving machine with weft insertion from one outside of the shed Weft yarn supply bobbin, the end of each weft thread being pulled out over the edge of the fabric by a gripper is characterized by a rod-shaped member (19) j which on the one facing the weaving line (34) Side of the gripper gripper (6) and approximately 'parallel to it Web slidably guided in the longitudinal direction and to a back and forth movement synchronized with the weft insertion is driven, in which the tip (21) of the organ (19) each enters the open compartment (27) and in the return with respect to the tip of the gripper gripper (6) trailing back over the fabric edge (23) .. 2. Paching device according to claim 1, characterized in that that the tip (21) of the rod-shaped member (19) by an adjustable amount (22) with respect to the gripper (6) is shifted. 3. Pachbildvorrichtung according to claim! ,, characterized in, that the rod-shaped organ is designed as a straight shedding needle (19) with guides (2, 17) which on a Shield (1) of the loom are attached -.- 109824/101 5 4. Shedding device according to claim 3, characterized in that the diameter of the shedding needle (19) is dimensioned is that there is a selectable cavity (33) between the shedding needle (19) and the slave gripper (6). GEORG FISCHER AG. BRUGG August 27, 1970
3559kä-ld 1Q9824 / 1Q15