Yarn tension control device

A yarn tension control device of knitting machines is revealed. A plurality of yarn tension control devices is disposed on a knitting machine for control of warp yarns while weaving the warp yarns to produce fabrics. The warp yarns can be metal yarns. The metal yarns on a yarn disc are passed through a guide holder, bars for drop wires, and drop wires and then entered steel healds and reeds. Thus a constant yarn tension over the warp yarns is ensured by the yarn tension control devices during a weaving process of weft yarns. The tension of the metal yarns is the same with the tension of textile yarns. Thereby a stable yarn tension over the warp yarns gives uniform fabric appearance.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a yarn tension control device, especially to a yarn tension control device used on a knitting machine for controlling tension of different warp yarns and providing a constant tension over the warp yarns on the knitting machine. Thus a stable yarn tension over the warp yarns gives uniform fabric appearance.

Description of Related Art

Generally, yarns used on a warp beam of a knitting machine including rapier loom are textile yarns. After the textile yarns being passed through bars for drop wires, and drop wires and then entered steel healds and reeds, their tension is easily controlled within a certain range. During knitting of weft yarns, a constant tension over the warp yarns is required in the conventional textile technology.

Refer toFIG. 1andFIG. 2, a conventional rapier loom is revealed. Yarns on a warp beam10are textile yarns. After passed through a guide holder91, a back rest sensing roller92, bars for drop wires93, drop wires94and entered steel healds95, the tension of the yarns is easily controlled within a certain range. During weaving of weft yarns after passage of reeds96, a constant yarn tension over the warp yarns is ensured. After the weaving of the wefts on the warps, fabric formed by the textile yarns is drawn by a cloth roller100. In the conventional rapier loom, only common fabric can be drawn and produced because that a constant yarn tension over the yarns is required.

Once metal yarns and textile yarns with different tensions are fed into the conventional knitting machine (including the rapier loom) and wound around the warp beam, warping is getting difficult. Besides increasing difficulty in warping, the different tensions of the metal yarns and the textile yarns from the yarn disc to the knitting machine for being woven lead to unstable yarn tension over the warp yarns. Thus the appearance of the fabric produced is uneven.

Thus there is room for improvement and there is a need to provide a novel yarn tension control device that solves the problems mentioned above.

SUMMARY OF THE INVENTION

Therefore it is a primary object of the present invention to provide a yarn tension control device that is applied to knitting machines for providing a constant yarn tension over different warp yarns on the knitting machine. Thus uniform fabric appearance is given by a stable yarn tension over the warp yarns during weaving.

In order to achieve the above object, a yarn tension control device according to the present invention includes a main support, a yarn disc disposed on one side of the main support, a clamp support arranged at the other side of the main support, a rotary disc located in the clamp support, a rubber set disposed on the clamp support for control of rotational speed of the rotary disc, and a rotatable clamping roller connected to the main support. The knitting machine is arranged with a plurality of yarn tension control devices for control of metal yarns while weaving warp yarns to produce fabrics. The metal yarns on the yarn disc are passed through a guide holder, bars for drop wires, and drop wires and then entered steel healds and reeds. Thus a constant yarn tension over each warp yarn is ensured by the respective yarn tension control devices while knitting weft yarns. Therefore uniform fabric appearance is provided by a stable yarn tension over the warp yarns during the weaving process.

An adjustment switch is arranged at the clamp support. The adjustment switch consists of a rod that is passed through an opening of the clamp support, a spring fit around the rod, and a knob fastened on a rear end of the rod for adjustment of an opening distance of the clamp support.

The metal yarns or textile yarns are fixed on the yarn disc after warping so that the yarn tension control device is independent of the warp beam. The yarn tension control device is used to adjust and control a tension of the metal yarn or the textile yarn from the yarn disc. Thus a stable fabric take-off speed is reached according to the tension of the warp yarns on the warp beam, the running speed of the knitting machine and the fabric weft density so as to produce fabric with certain weft density. Therefore the appearance of the fabric produced is uniform.

The yarn tension control device can be applied to knitting machines while producing special fabrics including conductive heating fabric, electromagnetic shielding fabric, radar absorbent fabric, etc. for control of tension of metal yarns or textile yarns in warp yarns therein. A plurality of yarn tension control devices is used while producing fabric.

The yarns tension control device is used during weaving of fabric formed by textile yarns. A plurality of metal yarns is woven on edges of two sides of the fabric surface. The metal yarns can be conductive metal yarns or non-conductive metal yarns.

The yarns tension control device is used during weaving of fabric formed by textile yarns. The fabric produced by textile yarns includes a plurality of textile yarns woven on edges of two sides of the fabric surface used as scrap yarns during knitting.

The clamping roller is connected to one end of the connecting rod and a bearing is mounted in the clamping roller so as to make the clamping roller rotatable and able to press against the yarns on the yarn disc. The yarns can be metal yarns or textile yarns.

In order to achieve the above object, a yarn tension control device according to the present invention includes a main support, a yarn disc and a rotary disc that are disposed on one side of the main support, a support fixing member arranged at one side of the rotary disc, an adjusting rod set moveable in the support fixing member, a belt mounted around the rotary disc for control of rotational speed of the rotary disc, and a rotatable a clamping roller connected to the main support. A plurality of yarn tension control devices is used for control of warp yarns respectively while weaving the warp yarns to produce fabrics. The warp yarns can be metal yarns. The metal yarns on the yarn disc are passed through a guide holder, bars for drop wires, and drop wires and then entered steel healds and reeds. Thus a constant yarn tension over the warp yarns is ensured by the yarn tension control devices during a weaving process of weft yarns. The tension of the metal yarns is the same with the tension of the textile yarns. Thereby a stable yarn tension over the warp yarns gives uniform fabric appearance.

The adjusting rod set consists of an adjusting bolt and a locking nut. The adjusting bolt is passed through and moveable in a guide slot while the locking nut is fastened on the adjusting bolt and used for positioning the adjusting bolt in the guide slot.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

In order to learn technical content, purposes and functions of the present invention, please refer to the following embodiments, related figures and reference numbers.

Refer fromFIG. 1toFIG. 5, a plurality of yarn tension control devices2according to the present invention is disposed over a knitting machine1while in use.

The yarn tension control device2includes a main support21set over the knitting machine1. A main shaft211is passed through the main support21and is arranged with a yarn disc22and a rotary disc25. The yarn disc22is wound with yarns. A rotatable clamping roller27is disposed on the main support21and is used for pressing against the yarns of the yarn disc22. The yarn disc22and the rotary25are rotated at the same speed along with the yarns being drawn by an external force. A friction damper B is set on one side of the rotary disc25correspondingly and is used to control and adjust rotational speed of the rotary disc25.

While in use, the friction damper B in the yarn tension control device2can adjust and control the rotational speed of the rotary disc by frictional resistance, tightness of the belt or arrangement of the electric brake system.

Refer toFIG. 5,FIG. 6,FIG. 7andFIG. 8, a yarn tension control device2according to the present invention is composed of a main support21, a yarn disc22, a clamp support23, a rotary disc25, a rubber set26and a rotatable clamping roller27.

The main support21is a base installed over the knitting machine1. A main shaft211and a connecting rod212are passed through and arranged at the main support21while a fixing base213is disposed on one end of the main shaft211.

The yarn disc22is fit on the fixing base213and is wound with yarns (including metal yarns4or textile yarns5). The yarns are used for warp knitting.

The clamp support23is disposed on one end of the connecting rod212and an adjustment switch24is arranged at a rear end of an opening of the clamp support23.

The rotary disc25is connected to the other end of the main shaft211and located in the opening of the clamp support23.

The rubber set26is fixed in the opening of the clamp support23and located on the left side and the right side of the rotary disc25.

The rotatable clamping roller27is arranged at the other end of the connecting rod212and is used for pressing against the yarn around the yarn disc22.

Refer toFIG. 3,FIG. 4andFIG. 5, a plurality of yarn tension control devices2is installed on a frame11of the knitting machine1(the conventional rapier loom shown inFIG. 3andFIG. 4) while in use. The yarn22of the yarn disc22includes metal yarns4or textile yarns5. After being passed through a guide holder6, bars for drop wires93and drop wires94, the metal yarns4are entered steel healds95. At the same time, general textile yarns5on a warp beam10are also passed through a guide bar91, a back rest sensing roller92, the bars for drop wires93, the drop wires94and entered the steel healds95. Then the metal yarns4and textile yarns5are passed through different reeds96respectively. After being weaved with weft yarns7, blended fabric A formed by the metal yarns4and the textile yarns5is obtained.

Refer fromFIG. 6toFIG. 11, a bearing3is mounted in the main support21of the yarn tension control device2. After the main shaft211being passed through the bearing3, one end of the main shaft211is set with the fixing base213and the yarn disc22while the other end of the main shaft211is arranged with the rotary disc25so as to form a linked rotating mechanism. Then the clamping roller27is connected to one end of the connecting rod212and another bearing3is mounted in the clamping roller27so as to form the rotatable clamping roller27that is pressed against the yarns on the yarn disc22(including the metal yarns4and the textile yarns5).

The other end of the connecting rod212on the main support21is set with the clamp support23. The clamp support23is a C-shaped piece with an opening while the rotary disc25is located in the opening of the clamp support23and the rubber set26corresponding to the rotary disc25is disposed on the clamp support23. The rubber set26is fixed in the opening of the clamp support23and located on the left side and the right side of the rotary disc25. Then a rear end of an opening of the clamp support23is arranged with the adjustment switch24. As shown inFIG. 8, the adjustment switch24consists of a rod241, a spring242and a knob243. The rod241is passed through the opening of the clamp support23and the spring242is set around the rod241while the knob243is fastened on a rear end of the rod241for adjustment of friction of the rubber set26with respect to the rotary disc25. The rotational speed of the rotary disc25is affected by the rubber set26. Thus the magnitude of the speed and the tension of the metal yarns4or the textile yarns5being drawn into the knitting machine1can be controlled.

The rubber set26has a two-piece structure. The tension of the yarns on the yarn disc22is increased when the knob243is turned for adjustment of the tension of the spring242and the two-piece rubber set26clips the rotary disc25more tightly. On the other hand, the tension of the yarns is reduced while the rotary disc25is clamped less tightly. Thus users can turn the knob243for adjustment of the yarn tension according to their requirements on production.

Moreover, besides the tightness of the rubber set26, the rotational speed of the rotary disc25can also be affected by other factors. Refer toFIG. 12andFIG. 13, another embodiment of the present invention is revealed. In this embodiment, a yarn tension control device2includes a main support21, a yarn disc22, a rotary disc25, a rubber set and a clamping roller27.

The main support21is a base installed over the knitting machine1and a main shaft211is passed therethrough.

The yarn disc22is fit on the main shaft211and is wound with yarns.

The rotary disc25is arranged at the main shaft211, and located on one side of the yarn disc22. A guide groove251is disposed around the circumference of the rotary disc25.

The rubber set is located on one side of the rotary disc25and having a support fixing member28and a belt29. The support fixing member28including a guide slot281is set on one end of the main support21while an adjusting rod set30is passed through the guide slot281and is moveable in the guide slot281. The belt29is mounted in the guide groove251and wound around the rotary disc25. One end of the belt29is a fixed end290while the other end thereof is disposed with a hook spring291being hooked to the adjusting rod set30. The friction of the belt29in relation to the rotary disc25can be adjusted by displacement of the adjusting rod set30.

The clamping roller27is rotatable and is arranged at the main support21for pressing against yarns around the yarn disc22.

Refer toFIG. 12andFIG. 13, this embodiment is disposed on a knitting machine in a similar way as the embodiment mentioned above. The difference between this embodiment and the above one is in that friction damping is from the belt in this embodiment. In both embodiments, the main support21is arranged with a bearing3therein. The main shaft211is disposed with the yarn disc22and the rotary disc25respectively after being passed through the main support21to form a linked rotating mechanism. Then another bearing3is mounted in the clamping roller27so that the clamping roller27is rotatable and able to press against the yarns on the yarn disc22. The yarns can be metal yarns4or textile yarns5.

Next the support fixing member28of the rubber set is fastened and fixed on the main support21. The adjusting rod set30is passed through the guide slot281of the support fixing member28. The adjusting rod set30consists of an adjusting bolt301and a locking nut302. The position of the adjusting bolt301in the guide slot281is fixed by the locking nut302after being inserted through the guide slot281and being adjusted properly. One end of the belt29is a fixed end290that is fixed on the main support21or is positioned at a rod which the clamping roller27is disposed on. Later the belt29is mounted in the guide groove251and wound around the rotary disc25. As to the hook spring291on the other end of the belt29, it is hooked onto the adjusting rod set30. Thus friction damping that works on the rotary disc25is generated by the belt29.

The further the adjusting bolt301is away from a fixed end on top of the guide slot281, the tighter and closer the belt29is clamped while the adjusting bolt301being adjusted and moved in the guide slot281. That means the larger the yarn tension of the yarns on the yarn disc22. On the other hand, the looser the belt29, the smaller the yarn tension is. Users can adjust the adjusting rod set30according to their own requirements on production.

Refer toFIG. 14, the present yarn tension control device is suitable to be applied to fabric A made from the textile yarns5. The fabric edge on each of two sides of the fabric A is woven with a plurality of the metal yarns4that are metal yarns or non-conductive metal yarns. The fabric A produced can be conductive heating fabric, electromagnetic shielding fabric or radar absorbent fabric.

The present yarn tension control device2can also be used to weave the textile yarns5for control of tension of the textile yarns5being drawn. During knitting, a plurality of textile yarns5is weaved on edges of two sides of the fabric surface and used as scrap yarns. The textile yarns5can be pure yarns or blended yarns.