DE3029793A1 - DEVICE FOR TENSION REGULATION ON A warp layer in a weaving machine - Google Patents

Description

SOCIETE ALSACIENWE DE CONSTRUCTIONS
MECAiJIQUES DE MULHOUSE

rue de la Fonderie

68o54 Mulhouse Cedex / France

Device for tension regulation on a warp thread layer in a weaving machine.

The invention relates to devices for regulating tension on a warp thread layer in a weaving machine, in particular on a "pile" warp thread layer of a double warp velvet.

The known devices of this type have a cross bar that is parallel to itself between the warp beam and the associated frame of the crockery is movable and counteracts under the action of a resilient member the warp layer lays. Generally, a bar is provided for each pair of frames used to form "pile" sheds. Most of the time, this rod is suspended from the lower ends of two rods, the upper ends of which are attached to the frame of the loom are pivotable about a geometric transverse axis. Although the rods are designed as tubes to reduce their weight are, the two rods supporting them have a relatively high inertia, since the rods mentioned actually in many cases a meter long. This does not cause any particular difficulties when weaving Warp velvet up to machine speeds of about 180 picks

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per minute, but that no longer applies at higher working speeds because the "pile" thread monitor is in the Frames cause unwanted stoppages in spite of every precaution that is taken to control of the threads during the instability phases of the warp thread layer. Otherwise the device works not effective enough to regulate the tension to prevent the pile height from increasing during the stoppages and varies during the start-up of the machine and in this way the dreaded "pile strips" of the weavers are created.

The invention is based on the object of improving the known devices for regulating the thread tension in such a way that that the disadvantages mentioned no longer occur.

For this purpose, according to the invention, one of the very same second crossbars is assigned to said crossbar in such a way that that a rigid, movable structure results from two parallel rods, the ends of which correspond to one another at two Double arms are attached, which can be pivoted on the machine frame about a common geometric transverse axis, which has the same distance from both rods, with a resilient member acting on the arms mentioned, to cause it to pivot in such a direction that the tension of the between the two rods through warp thread layer increases.

With this new type of construction, the inertia of the swivel system can be reduced considerably, because one has the Possibility of giving the arms a length of the order of magnitude less than 100 mm, while the rods that support the carry the only rod of the previously common devices, are up to one meter long, but nevertheless according to the

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finding changes in the length of the warp thread layer can be accommodated to the same extent. With very deep-pile velvets can also be made of the "pile" warp thread layer one after the other by two devices of the same type for voltage regulation arranged one behind the other conduct. In other words, a device according to the invention for voltage regulation practically prevents this Formation of pile strips and does not cause the loom to come to a standstill unintentionally like the devices earlier type.

To illustrate the invention, some embodiments of the invention are shown below with reference to the drawings Play device, a device for regulating tension on a "pile" warp layer of a double warp velvet.

Fig. 1 shows a first embodiment in a perspective view with coil springs;

Fig. 2 shows a detail of a modified embodiment with torsion springs;

Fig. 3 shows the arrangement of two similar devices one behind the other for very deep-pile velvets.

The device for regulating tension on a "pile" warp thread layer of a double warp velvet (Fig. 1) has a pivotable component group denoted by 1, which consists of two hollow rods 2, 3, the corresponding ends of which are attached to two double arms 4, 5, each carrying a journal 6, 7, which are received in bearings 8, 9; the bearings 8, 9 are on the frame attached to a loom. The two journals 6, 7 lie on a common geometric horizontal axis 12,

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which has the same distance from the two rods 2, 3 and runs transversely to the loom, of which two harness frames 13, 14, a warp beam 15, a guide roller 16, one Tape take-off roller 17 and a pressure roller 18 are drawn. The "pile" warp thread layer coming from warp beam 15 21 runs between the aforementioned rollers and between the two rods 2, 3 of the pivotable arrangement 1 in FIG the drawn way through before it gets into the frame 13, 14 of the dishes.

The arrangement 1 is forcibly pivoted in the direction of the arrow f1, which increases the tension in the warp thread layer 21 corresponds; the pivoting is caused by two resilient systems that act on the arms 4 or 5 act. In the example shown, the two systems mentioned each have a helical spring 24, one end of which is mounted in a bearing block 25 rigidly attached to the machine frame, while the other end is optionally hung in one of several regulation holes 26 cut in a bell crank 27 are pivotable at one end on a bracket 28 rigidly connected to the machine frame is appropriate. At the other end of the lever 27, one end of a rope 31 is hooked, which over a pulley 32 runs and the other end of which is hooked onto an extension 33 of the arm 4. The embossed on the thread layer 21 The tension is greater, the further the hole into which the spring 24 is hooked in the lever 27 from the pivot axis the lever is removed.

The advantages of this arrangement have already been mentioned above; this shall not be repeated here. Although the well-known Devices with only one rod, while the present device has two rods, is on top to point out that if the frames are adjusted so that the harness lies on an ellipse, if

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the compartments are fully open, the pad tensions and the thread elongations in the thread layers in all Subjects exactly match each other. A single device is enough for everyone to either be in with each other the same frame or frame that moves in the opposite direction. Just the weave, the cause to give shifts at different times, make a device for each type of movement necessary; there are very few such ties; an example is the Calonnier binding.

If very deep-pile velvets are to be produced, the "pile" warp thread layer may be of interest one after the other by two (or exceptionally by even more numerous) tension regulating devices arranged one behind the other according to the type of arrangement 1, as indicated in FIG. In this figure they are the The pivoting movement of the arrangement 1 causing resilient organs is not shown; you can add the use conventional elements, for example the springs 24 according to FIG. 1.

In a modified embodiment (see. Fig. 2) you can provide a torsion bar 41 as a resilient system, the with the geometric axis 12, i.e. the pivot axis for the arms 4, 5 is aligned and one end with the associated one Arm (in the drawn device part, the arm 4) is rigidly connected, while the other end is connected to the machine frame is rigidly connected, preferably via an angle adjustment device, which in the embodiment shown here consists of a fixedly connected to said other end of the torsion bar gear 42, which is in a Worm wheel 43 engages, which is provided with a hand wheel 44 for setting. A similar second torsion bar system is in connection with the other arm 5.

The patent attorney 130009/0851

summary

The invention is in the field of the textile industry.

The device has two parallel rods 2, 3, which are supported by two around a fixed geometric transverse axis 12 pivotable double arms 4, 5 are held between the warp beam 15 for the warp thread 21 and the frame 13,14 of the dishes. The warp thread layer runs between the two rods 2, 3; the two arms 4, 5 are forced by elastic means 24 to pivot in the direction of arrow f1, so that an inclination to increase the tension in the warp thread layer.

The invention can be used, in particular, for regulating the tension in a warp thread layer on a loom with a "pile" warp thread layer of a double warp velvet.

Figure 1.

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Claims (3)

Expectations : Device for tension regulation on a warp thread layer in a weaving machine, in particular on one "Pile" warp thread layer of a double warp velvet, with a first transverse rod movable parallel to itself between the warp beam and the associated harness frame, which is assigned to a second crossbar of the same type as the first in such a way that a rigid, movable arrangement (1) consists of two parallel rods (2, 3), the ends of which correspond to one another on two double arms (4 resp. 5) are attached, which can be pivoted on the machine frame about a common geometric transverse axis (12) are, which has the same distance from both rods, characterized in that resilient members (24) on the said arms (4, 5) act and cause them to pivot in such a direction (f1) that the tension the warp thread layer (21) which is passed between the two rods (2, 3) and which is located on the two rods is supported, reinforced. 130009/0851 BATH ORIGINAL _- ο 2. Device according to claim 1, characterized in that the resilient members are each formed by a JTeder (24), one end of which is connected to the machine frame f and the other end of which is connected to the associated swivel arm (4 or 5). 3. Device according to claim 1, characterized in that that the resilient members are each formed by a torsion bar (41) with the geometric pivot axis <12) for the arms (4, 5) is aligned and one end of which is rigidly connected to the assigned arm (4 or 5), while the other end is attached to the machine frame. 130009/085 1