DE19610671B4 - Method for hooking weft threads in the hooks of the transport chains of a warp knitting or stitching machine - Google Patents

Abstract

Method for hooking weft threads in the hooks of the transport chains of a warp knitting or stitchbonding machine, wherein
a weft crowd by means of weft carriage
by means of laying stroke across two spaced apart from each other continuously moving to the active site transport chains is placed in mutually changing directions, and
the weft crowd with the help of the Schußlewagen
transverse to the laying direction movable weft yarn guides each outside the movement path of the hook, relative to the movement of the transport chains by means of offset stroke to the next start position for the laying stroke is movable,
characterized in that the weft yarn guide
- at the end of a laying stroke and / or
At the end of an offset stroke,
- in each case before the crossing of the trajectory of the hooks of a transport chain,
- parallel and rectified to the direction of movement of the transport chain
be brought to the speed of the transport chain and
that the weft leader
- during the laying stroke between the two transport chains
- a Zusatzversatzhub is superimposed
- in the direction of movement of the ...

Description

The The invention relates to a method for suspending Weft yarn sheets in the hooks of the transport chains of a warp knitting or stitching machine, being a weft crowd by means of a wagon, with Legehub across two at a distance from each other continuously moved to the site of action Transport chains are placed in mutually changing directions and the weft crowd with the help of, at the Schußlegewagen Transversely to the laying direction movable weft guides each outside the trajectory of the hook relative to the movement of the transport chains with offset to the next Start position for the laying stroke is movable.

devices for flocking laying of weft threads on warp knitting machines, in particular stitchbonding machines, are known in different variants.

With the German patent DE 20 13 694 A a stitchbonding machine was described. This stitchbonding machine has on both sides of the font at right angles arranged endless transport chains, the upper strand moves continuously against the knitting point.

These Transport chains have pairs facing each other open top hooks.

One Weft laying carriage is changing over the moved away both transport chains. His weft leader has tubular weft eyelets, the between the hooks of the transport chain can intervene. Of the Weft leader is at the Schußlegewagen displaceable parallel to the transport direction of the chains.

Of the Drive this weft yarn guide is done between the transport chains by means of fixed cams.

To have the weft guides the Movement level of the hooks of the transport chains outwards exceeded, leaves one preloaded compression spring snap back the weft yarn guides outside the hook row, So that the Weft leader one be assigned to adjacent hook group.

These Cam for the weft leader is designed so that the Weft guide during the Legehubes is offset in the direction of movement of the chains.

Has he reaches the necessary position, he is perpendicular to the direction of movement the transport chains moved through the row of hooks and behind the hook row brought into the new position. In the new position is the weft guide his stop at the laying carriage. This will also be vertical led to the trajectories of the transport chains.

A such device has only a theoretical value per se. The distances between the hooks need be chosen so big that the Weft guides, in particular their individual tubes, in any case can be moved freely through the hook lanes.

The textile surfaces produced therewith show structures for the clothing sector are not usable.

you has tried other means of skewing the weft threads behind the hooks to use the transport chains.

With the DE 20 12 114 A a device has been described in which the weft guide is rigidly attached to the weft carriage. Depending on an additional comb-like yarn guide is outside the trajectories of the transport chains.

This Comb is with his teeth directed against the row of hooks. The wefts are at the same time between Hook and teeth laid this comb.

immediate after the passage of the weft guide these combs offset against the direction of movement of the transport chains. During the return stroke of Weft leaders become those run by the comb Wefts of the next Assigned to a hook group.

adversely is in this arrangement that the device because of the big one Number of wefts and the size Number of parts to be moved by different drive elements the device becomes complicated and prone to failure. The cost of production the device is high, the maintenance is time consuming.

The variability the laying of the wefts is extremely limited, for each Laying different work elements are necessary.

Also in terms of the density of the weft threads presented, there are significant limitations, because here too the wefts on a web perpendicular to the path of the transport chains across the same guided become. The machine must be in oversized the depth become. She needs lots of space.

Aiming the number of elements of the vor To reduce direction and increase the possibilities of the variant variants, was with the patent DE 39 32 184 C1 proposed a device in which the laying stroke of the weft carriage is generated by a computer-controlled motor via a spindle.

For the offset movement of the weft leader on Weft laying carriage is on the Schußlegewagen Even a second computer-controlled engine provided, the Movement of the weft leader across can control the laying stroke. Procedural steps for the treatment of the thread while the laying are not described.

With the main patent DE 196 04 422 C1 It has been proposed to provide, instead of the second motor on the weft carriage for the displacement of the weft yarn guide a drive which is mounted stationary.

The Movement of this stationary drive is moved to a carriage Transfer part. With the differential motion between the wagon and the movement of the moving part of the weft yarn guide is moved in the offset direction.

In the main patent will be different forms of absolute movement of the weft yarn guide indicated.

It is proposed for the first time, the weft guide during the passage through the Hook row of transport chains in the transport direction with the same To move the speed at which the transport chains do it.

Around to ensure, that both the orientation of the movement sections of the web on the transport chain and also the offset movement outside the transport chains are executed in the time available can, you have the offset movement outside the chains rectified designed with the transport chains.

looks refrain from that with it except for Chains a very high displacement speed had to be ensured is also the achievable laying of the yarn sheets for many Applications can not be used.

The Laying of the yarn sheets was done in an irregular manner one above the other. The density of the weft knitted fabric left many Wishes open.

Especially during the processing of wefts Glass or carbon it came to loosening of such threads. The Threads broke loose unchecked from the hooks of the transport chains. The product then produced was faulty.

The The object of the present invention is independent of predetermined replica the wefts, even when using Silk made of glass or carbon, reliable between as possible insert tightly arranged hooks of the transport chains, the same outside to move the hook row avoiding loops and the new hook group trouble-free to hand over.

The variability in the manner of the shot should at least be preserved without the reliability the insertion of wefts is impaired.

According to the invention this Object by the method defined in claim 1 on relative simple way solved.

With adjusting the movement component of the weft yarn guide to the respective speed the transport chains in the phase of crossing the hook row through the weft guides, both at the transition from the laying stroke to the offset stroke as well as the transition from the offset to the Legehub, a high security of the insertion process is guaranteed.

Backs one, that the absolute speed of the weft yarn guide, especially at the transition From the offset stroke to the following Legehub is always slightly larger than the speed of the transport chain, then you can also Routing glass and carbon fibers reliably.

used one the offset direction according to claim 2, one has one hand, Regarding the thread layer, appealing form of laying and comes additionally with relatively low displacement speeds of the weft yarn guide.

With The design of the method according to claim 3 possibilities shown how to weft layers in a bigger rapport of laying strokes in a very different way and can also control.

The Defined in claim 4 process design defines certain Criteria of the procedure for a variable design of the alloys, where the offset stroke is also performed in the direction of movement of the transport chains.

The method according to claim 5 ensures that the combined strokes in the program in each case a bumpless and after possible Also allow smooth movement of the weft yarn guide in each phase of movement.

The allow defined in claim 6 elements and method steps also the use of additional guidance between the two outer transport chains. The wefts can also in these guide elements with high precision be inserted.

The Invention will be explained in more detail below using an exemplary embodiment. The associated Drawings show:

1 a schematic overall view of the drive for the weft carriage and the weft guide on the laying carriage,

2 a general overview of the absolute trajectory of a weft thread guide over both transport chains,

3 a representation analogous to 2 with inclusion of a displacement stroke,

4 a representation analogous to 2 with programs for easy zigzagging,

5 the absolute trajectory of a weft leader with a repeat over several double lei and

6 a representation analogous to 5 including offset strokes, which are carried out in the transport direction of the chain.

The warp knitting machine has one over the transport chains for the laying of weft threads 3 . 4 movable waggle carriage 1 ,

The waggle carriage 1 is on guide rails 11 guided and by means of toothed belt 13 over the clutch 12 with laying stroke over both transport chains 3 . 4 emotional.

For the drive is a motor 16 provided the computer-controlled, position-oriented, can generate a drive movement according to exactly predetermined laws of motion. This drive movement is via the drive wheel 15 and the timing belt 13 on the weft carriage 1 transfer.

On the waggle carriage 1 is transverse to its drive direction in a guide 21 the weft leader 2 movable. This gets its drive also from an engine 27 , the computer-controlled, position-oriented, can generate a drive movement according to exactly predetermined laws of motion.

He transmits this movement according to the teachings of the main patent on a toothed belt 24 , the role of stationary mounted roles 25 . 26 is guided.

The drive movement of the toothed belt 24 is on the weft carriage 1 from the drive wheel 231 accepted. The support roller 233 Ensures the reliable engagement of the toothed belt 24 ,

Another, on the Schußlegewagen 1 about the roles 231 and 232 guided toothed belt 23 moved over the clutch 22 the weft leader 2 ,

The weft leader 2 is equipped with tubes or guide needles for each weft thread, which project from the bottom of the thread guide and in their laying movement, the gaps between the hooks 31 . 41 the transport chains 3 . 4 can reach through.

Of course, this embodiment is intended only as an embodiment. It is crucial that this weft leader 2 the weft on the transport chain 3 . 4 can position at a precisely predetermined location.

The way of presenting the wefts should be at the absolute trajectory 5 ( 2 ) of a single weft yarn guide.

We begin the consideration at the movement section 51 , The weft guide moves over the hooks 31 the transport chain 3 at a certain speed.

The in the direction of movement 32 the transport chains 31 directed component 281 this speed corresponds to the speed 33 the transport chain.

Immediately thereafter, this component is delayed to zero and in the offset direction 54 against the transport direction 32 accelerated.

Has the weft leader 2 his for the next laying stroke 53 is almost reached, it is delayed and accelerated again in the direction of transport.

He can at 51 ' again with synchronous speed through the hooks 31 to step.

At the next laying stroke in the direction of the other transport chain 4 The weft guide also performs an additional offset stroke 55 out, here the size of the offset stroke 54 equivalent. He is opposite to this hub.

The component 282 the speed, which is directed in the transport direction, is greater than the transport speed 33 . 43 the transport chain 3 . 4 ,

Just before the hook row 41 the transport chain 4 This component of this speed will be back to speed 43 the transport chain 4 reduced. This is how the weft guide crosses 2 the row of hooks 41 ,

Thereafter, the weft yarn guide is again against the transport direction 42 with the offset stroke 54 ' added.

The process corresponds to that in relation to the crossing of the transport chain 3 has been described.

In the position 52 ' the weft leader again has a speed in the direction of transport, that of speed 43 the transport chain corresponds.

In each insertion and offset phase, it is important that the piece of weft thread between the exit opening of the weft guide and the hook 31 . 41 who leads the weft last, is always taut. This is achieved reliably when the absolute speed of the weft yarn guide 2 always greater than the increase in length of the free thread piece per unit time.

It has proved to be useful, the individual phases of motion as combinable control programs the computer for controlling the motors 15 . 27 pretend. Each of these programs should thereby control laws of motion, which are at least shock-free and, if possible, jerk-free. The transitions should be designed so that the trajectories tangentially merge into each other.

The Use of simple sinoids and sinoids to Besterhorn has proven.

In the 2 illustrated basic form of movement can be modified in a variety of ways.

In 3 is this basic movement 6 a displacement movement 56 considered. The weft layer is inclined relative to the transport direction and the weft threads are aligned parallel to each other. The offset stroke 64 . 64 ' corresponds approximately to the width of the weft crowd. The additional offset stroke 55 also corresponds here to the size of the offset stroke 64 , but with a different sign.

The transitions 71 . 71 '; 72 . 72 ' over the hook rows 31 and 41 are designed as they relate to 2 have been described.

The 4 shows a trajectory 7 a weft leader 2 for laying zig-zags. The offset stroke 74 . 74 ' is reduced to the smallest size.

In the 5 and 6 are shown exemplary combinations of strokes with different offset and additional stroke sizes.

In 5 are all offset movements - although with different offset sizes 84 . 84 ' . 84 '' . 84 ''' but shown with the same offset direction. The sum of all offset strokes 84 . 84 ' . 84 '' . 84 ''' in a repeat is equal to the sum of the additional offset strokes ( 55 ) with a different sign. The crossing points 81 . 81 ' . 81 '' . 81 ''' . 82 . 82 ' . 82 '' . 82 ''' over the transport chain 3 . 4 correspond here also the described basic rules. ( 2 )

In 6 are offsets with different offset sizes 94 . 94 ' . 94 '' . 94 '''and shown with different directions of displacement. The sum of all offset strokes 94 . 94 ' . 94 '' . 94 '''and the additional offset strokes ( 55 ) in a rapport is zero here.

The crossing points 91 . 91 ' . 91 '' . 91 '''; 92 . 92 ' . 92 '' . 92 ''' over the transport chain 3 . 4 correspond here also the described basic rules. ( 2 )

Important is in the design of such reports that the weft leader after each repeat again a freely chosen one Exit point reached.

The Design of the repeats itself depends on the desired textile technological effects.

1

Shot laying carriage

11

guide rails

12

clutch

13

toothed belt

14

guide wheel

15

drive wheel

16

engine

2

Weft leader

21

guide

22

clutch

23

toothed belt

231

drive wheel

232

leadership

233

supporting role

24

toothed belt

25

leadership

26

drive wheel

27

engine

3

transport chain

31

hook plane

32

transport direction

33

transport speed

4

transport chain

41

hook plane

42

transport direction

43

transport speed

5

trajectory Weft leader

51 51 '

52 52 '

sections the trajectory in the cross

cut area the hook plane

53

Legehub

54 54 '

displacement stroke

55, 55 '

Zusatzversatzhub

56

displacement amount

6

trajectory Weft leader

61, 61 ',

62 62 '

sections the trajectory in the cross

cut area the hook plane

64.64 '

displacement stroke

7

trajectory Weft leader

71, 71 ',

72 72 '

sections the trajectory in the cross

cut area the hook plane

74 74 '

displacement stroke

8th

trajectory Weft leader

81, 81 ', 81' ', 81' ''

82 82 ', 82' ', 82' ''

sections the trajectory in the cross

cut area the hook plane

84 84 ', 84' ', 84' ''

displacement stroke

9

trajectory Weft leader

91 91 ', 91' ', 91' ''

92 92 ', 92' ', 92' ''

sections the trajectory in the cross

cut area the hook plane

94 94 ', 94' ', 94' ''

displacement stroke

Ü

blowout

Claims (6)

Method for hooking weft threads in the hooks of the transport chains of a warp knitting or stitching machine, a Schußfadenschar by means of Schußle carriage by laying stroke across two spaced apart continuously moving to the active point transport chains in mutually changing directions, and the weft thread with the help of Schußlewagen transversely to the laying direction movable weft yarn guides each outside the movement path of the hook, relative to the movement of the transport chains by means of offset stroke to the next start position for the laying stroke is movable, characterized in that the weft yarn guide - at the end of a laying stroke and / or - at the end of a displacement stroke, - in front of each the crossing of the trajectory of the hooks of a transport chain, - are brought to the speed of the transport chain parallel and rectified to the direction of movement of the transport chain and that the weft yarn guide - during the Legehu bes between the two transport chains - an Zusatzversatzhub is superimposed - in the direction of movement of the transport chains has a speed component which is greater than the average speed of the transport chains, - wherein the sum of all offset strokes and Zusatzversatzhübe in a repeat is zero. Method according to claim 1, characterized in that that the Offset stroke always against the direction of movement of the transport chains is directed. Method according to Claims 1 and 2, characterized that the additional offset stroke a displacement stroke - opposite and / or superimposed in the direction of movement of the transport chains becomes, - in which the sum of all displacement strokes in a rapport is zero. Method according to claim 1, characterized in that that the offset stroke always directed in the direction of movement of the transport chains and that the Zusatzversatzhub a Verlagerungshub against the direction of movement superimposed on the transport chains becomes, - in which the sum of all displacement strokes, all offset strokes and all additional offset strokes in a rapport is zero. Method according to one of claims 1 to 4, characterized that everyone Stroke, the Lever Hub, the offset stroke, the additional offset stroke and the displacement stroke individually, each a bumpless movement assigned. Method according to one of claims 1 to 4, characterized in that between the trans port chains the wefts receive an additional, driven guide and the offset movement of the weft guide is adapted in the region of these guides the transport speed of these guides.