Classifications

• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
  • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
  • D02G3/36—Cored or coated yarns or threads
  • D02G3/367—Cored or coated yarns or threads using a drawing frame

Definitions

• the present invention relates to a device and a method for making a core yarn according to the preamble of the patent claims .
• FRl 449645 of Les Filatures du Srtel Felix Watine et FiIs was published on 6 th May 1 966 and discloses a device for making a core yarn.
• a bobbin of a core filament is arranged on two parallel unrolling cylinders.
• the core filament is unrolled from the bobbin around one of the unrolling cylinders and then bypasses a deflection pulley before it is introduced into a ring spinning process by the delivery rolls of a drafting unit.
• DE'1 63 describes a drawing unit with a guiding unit for feeding a core filament.
• the drawing unit has a sliver guide with a reciprocating side movement before the entry of the sliver into the final pair of drawing rollers.
• the sliver guide is combined with a guide for a core yarn, into a one-piece guide unit.
• the combined guide is moved sideways by a reciprocating drive.
• the system comprises two unrolling cylinders which are arranged above the spindles in the length direction of the spinning machine.
• the two unrolling cylinders are arranged on the same level behind each other and are suitable to carry bobbins with a core filament.
• the core filament is unwound from the bobbins around one of the unrolling cylinders and is then deflected by a sensor pulley, which electronically monitors con- tactless the presence of the core filament. If no core filament is present, the spinning process for the affected spindle is halted. For each spindle, a sensor pulley is present which is arranged at an arm that can be pivoted upward.
• the core filament is deflected by the sensor pulley, which is arranged above a pair of delivery rolls of a drawing unit. After the core filament has passed the sensor pulley, it is introduced into the spinning process by the respec- tive pair of delivery rolls.
• One object of the herein disclosed invention is to provide an improved device for the making of core yarns.
• a further object of the invention is to provide a device, which is capable in handling larger bobbins and non-elastic core filaments.
• Still a further object of the invention is to provide a system which is more user friendly.
• the problem may occur that the size of the filament bobbin and other parameters have a negative impact on the resulting yarn quality, because an angular dependent oscillating tension in the core filament occurs during unrolling.
• the filament travels along the bobbin during unrolling a significant distance although the deflection roller receiving the filament remains stationary.
• the "free length" of the filament between the unrolling cylinder/ bobbin and the subsequent deflection roller changes in an oscillating manner.
• the deflection roller may have a negative impact on the spinning process. This effect is less severe or does not have a negative impact in the case that bobbins with a smaller diameter and/or length are used or the core filament has a certain elasticity.
• the present invention overcomes this problem by a special arrangement of deflection rollers in addition to and separated from the unrolling cylinders, which carry the bobbin with the core filament.
• the bobbins for the core filament are arranged in a single row lateral to each other. Their maximum length is thereby limited by the distance be- tween the spindles of the respective ring spinning device and spacers arranged in between. Due to that, their capacity is limited, which results in a more often exchange.
• Other attempts have been undertaken to arrange the reservoir of the core filament high above the spinning frame. However problems with the blower and during handling are quite likely. In addition, it is often necessary to stop the spinning process because otherwise it would not be possible to handle the heavy bobbins.
• the storage system for the bobbins with the core filament.
• the storage system according to said embodiment of the invention comprises two pair of unrolling cylinders, which are arranged behind each other offering several advantages with respect to the size of the bobbins and their handling.
• two bobbins are arranged behind each other, it becomes possible to make each bobbin larger and thereby more ample, which results in an improved durability and therefore less maintenance is needed.
• this storage system is combined by a special arrangement of deflection rollers, it is possible - beside elastic filaments - to process hard (non-elastic) filaments in a very effective manner.
• a first and a second deflection roller are arranged spaced a distance apart from one another, deflecting the core filament twice before it is introduced into the spinning process thereby effectively influencing/reducing the occurring oscillation of the tension in the filament, which results from the oscillating lateral travelling of the filament during unrolling.
• a first deflection roller is arranged in a region in above (or in front) of an upper delivery roller of a drawing unit and the second deflection roller is arranged in horizontal direction behind and above the first deflection roller directly or indirectly receiving the filament unrolled from the bobbins.
• the deflection rollers may be arranged stiff and/or deflectable against the force of a spring or a counter weight. If appropriate, at least one deflection roller may be replaced by another deflection means.
• the invention may foresee an improved supporting structure and arrangement for bobbins having a significantly larger diameter compared to the prior art.
• the supporting structure can be designed for smaller bobbins, if required.
• spacers for several types of bobbins may be foreseen.
• the spaces may be arranged pivotable about an axis such that they can be easily removed when not required.
• the device for making of a core yarn comprises a first and a second pair of driven unrolling cylinders.
• the first and the second pair of unrolling cylinders are arranged in horizontal direction behind and spaced a distance apart from each other each suitable to receive a bobbin of core filament.
• a first deflection roller separated from the unrolling cylinders deflects the core filament unrolled from the bobbin before it is entered into the spinning process of a spindle via a delivery roller of a drawing unit.
• a second deflection roller is arranged between the first deflection roller and the unrolling cylinders deflecting the filament a second time thereby reducing the influence of negative oscillations within the tension of the core filament. Good results are achieved, if the first deflection roller is arranged above the delivery roller of the drawing unit.
• the sec- ond delivery roller may be arranged above an entry roller of the drawing unit. If required, one of the deflection rollers may be arranged displaceable.
• One of the deflection rollers may be interconnected with means to determine the presence of the core filament, e.g. an electronic sensor. If required, at least one of the deflection rollers may be interconnected with means to stop the spinning process of a dedicated spindle, e.g. in that the supply of a row- ing is stopped.
• a dedicated spindle e.g. in that the supply of a row- ing is stopped.
• the first and the second pair of unrolling cylinders are arranged vertically on the same level with respect to each other. However, other arrangements are possible as long as the functionality is not affected.
• first and the second pair of unrolling cylinders are driven in the same direction with respect to each other such that a bobbin of core filament can be rolled over from the first to the second pair of unrolling cylinders without halting spinning process.
• Parts of the device are designed such that it is possible to convert an existing ring spinning device into a device for making core yarn.
• Said parts can be sold in the form of a kit for conversation of a ring spinning device into a device for making core yarn, comprising a first and a second pair of unrolling cylinders, a supporting rack for the unrolling cylinders and a drive for the unrolling cylinders.
• the kit may comprise spacers which are attachable to the supporting rack to be arranged between several bobbins of core filament and several deflection rollers to deflect the core filament unrolled from the bobbins before entry into a spinning process.
• Fig. 1 an embodiment of the invention in a perspective view
• FIG. 2 details of the embodiment according to Figure 1 in a magnified manner;
• Fig. 3 the embodiment of Figure 1 in a side view;
• Fig. 4 the embodiment according to Figure 2 in a front view.
• Figure 1 shows a first embodiment of a device 1 according to the present invention in a perspective view.
• Figure 2 shows details of the embodiment according to Figure 1 in a magnified manner.
• Figure 3 shows the device according to Figure 1 in a side view.
• Figure 4 shows the embodiment according to Figure 2 in a front view.
• the device 1 comprises two pairs of unrolling cylinders 2.1 , 2.2, which serve to carry the core filament bobbins (bobbins) 3.1 , 3.2 and to unroll a core filament (filament) 10 from the bobbins 3.1 , 3.2.
• the herein shown device is suitable to handle and process larger bobbins 3, which have a length e.g. in the range of approximately 90 mm to 1 50 mm and a diameter of approximately 1 00 mm to 300 mm. Other dimensions are possible depending on the field of application.
• Spacers 4 are arranged between the bobbins 3 avoiding that the bobbins interact during operation.
• the unrolling cylinders 2.1 , 2.2 are in a vertical direction (z-axis) arranged between the drawing units 5 mounted on a ring spinning frame 6 and the flyer spools 7, which are hanging on a creel 8.
• the unrolling cylinders 2.1 , 2.2 are in horizontal direction (y-axis) arranged behind each other on the same level and supported by a supporting rack 1 5, which is interconnected to the spinning frame 6.
• a difference in vertical position is acceptable as long as the functionality does not suffer.
• the pair of unrolling cylinders 2.1 in the front (right hand side) and the pair of unrolling cylinders 2.2 in the rear of the machinery (left hand side) are both driven clockwise with respect to the view of Figure 3 such that the respective bobbins 3.1 , 3.2 are rotating counter clockwise around their length axis (x-axis).
• the filament 1 0 of the front bobbins 3.1 is unwound directly from the bobbin without contact to the associated unrolling cylinder 2.1
• the filament 1 0 of the rear bobbin is unwound around one of the second unrolling cylinders 2.2.
• One advantage is that the front bobbin 3.1 can easily be rolled over to the rear position without the need to stop and start spinning of the respective spindle. This becomes important when the rear bobbin 3.2 is empty and must be replaced. In the devices known from the prior art, it is very difficult to exchange an empty bobbin without stopping additional spindles. If necessary, additional means to guide the filament can be foreseen.
• the spacers 4 of the shown embodiment are fastened to two supporting rods 9 arranged between the front and the rear unrolling cylinders 2.1 , 2.2.
• the supporting rods of the shown embodiment are arranged such that they do not hinder the rolling over of the bobbin
• Figure 4 shows the embodiment according to Figure 2 in a front view.
• the bobbins 3.1 , 2.1 are arranged behind each other on the allocated unrolling cylinders 2.1 , 2.2. Because of the viewing direction, only the front bobbin 3.1 and the front pair of unrolling cylinders 2.1 are visible.
• the lateral travelling of the filaments 10 during unrolling is indicated by arrows 1 6.
• the maximum deflection normally occurs at the upper end.
• the drawing unit which may have a sliver guide with a reciprocating side movement. If not present, the side movement is at the lower end zero.
• the first deflection rollers 1 3 are attached to an arm 1 7, which is arranged above the drawing unit 5 and which is fixed pivotable in upward direction to a fixation beam 1 9 via a base element 1 8.
• the second deflection rollers 14 are in the herein shown embodiment fastened to a holder 20, which is also attached to the fixation beam 1 9.
• the first and the second deflection rollers 1 3, 14 are in the spinning process arranged im- movable with respect to each other. Depending on the field of application, e.g. to process less critical filaments, it is possible to avoid the second deflection rollers 14.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
• Spinning Or Twisting Of Yarns (AREA)
• Unwinding Of Filamentary Materials (AREA)

Priority Applications (4)

Applications Claiming Priority (1)

Publications (1)

Family

ID=42260391

Family Applications (1)

Country Status (4)

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Citations (5)

Family Cites Families (1)

• 2009
  • 2009-07-09 CN CN200980159728.6A patent/CN102471952B/zh active Active
  • 2009-07-09 WO PCT/EP2009/058753 patent/WO2011003452A1/en active Application Filing
  • 2009-07-09 EP EP09780379.5A patent/EP2452002B1/en active Active
  • 2009-07-09 ES ES09780379.5T patent/ES2568205T3/es active Active

Patent Citations (5)

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