HILBER, Markus (Gallusstrasse 70, Wil, CH-9500, CH)
GRUNDER, Killian (Märzenbühlstrasse 17, Oberengstringen, CH-8102, CH)
HILBER, Markus (Gallusstrasse 70, Wil, CH-9500, CH)
| PATENT CLAIMS 1 . Device (1 ) for making a core yarn comprising a first and a second pair of driven unrolling cylinders (2.1 , 2.2), whereby the first and the second pair of unrolling cylinders (2.1 , 2.2) are arranged in horizontal direction behind and spaced a distance apart from each other each suitable to receive a bobbin of core filament (3.1 , 3.2), and a first deflection roller (1 3) per bobbin arranged between the unrolling cylinders (2.1 , 2.2) and a delivery roller (1 1 ) of a drawing unit (5) to deflect a core filament (1 0) unrolled from the bobbin of core filament (3.1 , 3.2) before it is entered into the spinning process of a spindle via the delivery roller (1 1 ). 2. The device (1 ) according to claim 1 , characterized in that the first deflection roller (1 3) is arranged above the delivery roller (1 1 ) of the drawing unit (5). 3. The device (1 ) according to one of the previous claims, characterized in that a second deflection roller (14) is arranged between the first deflection roller (1 3) and the unrolling cylinders (2.1 , 2.2). 4. The device (1 ) according to claim 3, characterized in that second deflection roller (14) is arranged above an entry roller (1 2) of the drawing unit (5). 5. The device (1 ) according to one of the previous claims characterized in that at least one of the deflection rollers (1 3, 14) is arranged displaceable. 6. The device (1 ) according to one of the previous claims characterized in that at least one of the deflection rollers (13, 14) is interconnected with means to determine the presence of the core filament (10). 7. The device (1 ) according to claim 6, characterized in that at least one of the deflec- tion rollers (13, 14) is interconnected with means to stop the spinning process of a dedicated spindle. 8. The device (1 ) according to one of the previous claims characterized in that the first and the second pair of unrolling cylinders (2.1 , 2.2) are arranged vertically on the same level with respect to each other. 9. The device (1 ) according to one of the previous claims characterized in that the first and the second pair of unrolling cylinders (2.1 , 2.2) are driven in the same direction with respect to each other such that a bobbin of core filament (3.1 , 3.2) can be rolled over from the first to the second pair of unrolling cylinders (2.1 , 2.2) without halt of the spinning process. 10. The device (1 ) according to one of the previous claims characterized in that the two bobbins of a core filament (3.1 , 3.2) are arranged behind each other are laterally separated from a neighbouring bobbin of core filament (3.1 , 3.2) by a common spacer (4). 1 1. The device (1 ) according to claim 10, characterized in that the spacer (4) is mounted on a supporting rod (9) arranged between the unrolling cylinders (2.1 , 2.2) of a pair of unrolling cylinders (2.1 , 2.2). 2. 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 (2.1 , 2.2), a supporting rack (1 5) for the unrolling cylinders (2.1 , 2.2) and spacers (4) attachable to the supporting rack (1 5) to be arranged between several bobbins of core filament (3.1 , 3.2) and several deflection rollers (1 3, 14) to deflect the core filament unrolled from the bobbins before entry into a spinning process. |
FIELD OF THE INVENTION
The present invention relates to a device and a method for making a core yarn according to the preamble of the patent claims .
BACKGROUND OF THE INVENTION
Devices for making core yarns are known since many years and are mainly directed to the making of a yarn with an elastic core filament.
US20241 56 and US2210884 were assigned to the United States Rubber Company and were published on 1 7 th December 1 935 and 1 3 th August 1 940. Both publications are di- rected to methods for making an elastic yarn. The method describes how a core filament is introduced into a ring spinning process before the delivery rollers of a drawing unit and a cover of textile fibers is spun about the core filament.
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.
DEl 9501 1 63 was filed in the name of Zinser Textilmaschinen GmbH and published on
18 th April 1 996. 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.
From the same applicant a device for making core yarn is known, which has been on the market for several years. 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.
US20061 79810A in the name of Invista North America S.A.R.L was published on 1 7 August 2006 and discloses polyester bicomponent core spun yarn, which comprises a sheath of at least one hard fibre and a core of bicomponent polyester filament. This product is known under the brand name "T-400" and behaves like a non-elastic (hard) fibre during the spin- ning process, but becomes elastic after processing by a temperature treatment. Thereby, it is possible to make bidirectional stretchable garments and fabrics. Although the T-400-fibres are of the core yarn type, the devices for making core yarns are only limited suitable for the spinning of T-400-fibres, since they act like hard fibres and become elastic by a subsequent activation after the weaving process. A further problem inherent to the known devices is that they are not suitable for handling bobbins having a larger size.
SUMMARY OF THE INVENTION
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.
When processing core yarns having a hard (non-flexible) filament at the inside on a ring spinning machine, 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. Especially with bobbins exceeding a certain length, the filament travels along the bobbin during unrolling a significant distance although the deflection roller receiving the filament remains stationary. As a result thereof, the "free length" of the filament between the unrolling cylinder/ bobbin and the subsequent deflection roller changes in an oscillating manner. Especially with a hard (non-elastic) core filament and a disadvantageous arrangement of the deflection roller, this 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.
In the devices known from prior art, 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.
This problem is overcome by an embodiment of the invention by an improved 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. In that 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. In that 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. Depending on the field of application, it is also possible to use the storage system to process normal core filament bobbins.
In an embodiment per spindle 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. Depending on the field of application, 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. Good re- suits are achievable if the first and the second deflection roller are arranged during opera- tion at a constant distance from each other. 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.
To improve the handling of larger bobbins with the core filament, the invention may foresee an improved supporting structure and arrangement for bobbins having a significantly larger diameter compared to the prior art. Still, the supporting structure can be designed for smaller bobbins, if required. If necessary, 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. In an embodiment 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. If required, per bobbin 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. If required, 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. Normally, 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. It may be advantageous, if the 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. In addition 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.
BRIEF DESCRIPTION OF THE DRAWINGS The herein described invention will be more fully understood from the detailed description given herein below and the accompanying drawings which should not be considered limiting to the invention described in the appended claims. The drawings are showing:
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.
DESCRIPTION OF THE EMBODIMENTS
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. In difference to the devices known from prior art, 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.
As it can be seen best in Figure 3, 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. Depending on the field of application, a difference in vertical position is acceptable as long as the functionality does not suffer. In the shown embodiment, 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). While 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
3.1 from the front to the rear position, e.g. by disturbing the unrolling filament during the spinning process. Depending on the field of application other arrangements are possible as long as the functionality is not constrained. If the rolling over is not necessary, it is also pos- sible to unroll the front and the rear bobbin 3.1 , 3.2 over the respective unrolling cylinder
2.1 , 2.2. The driving directions of the unrolling cylinders are adopted respectively.
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. At the lower end in the area of the deflection rollers, the lateral movement is given by 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. In the shown embodiment, 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.
LIST OF DESICNATIONS
1 Device for making core yarn
2.1 Unrolling Cylinders Front
2.2 Unrolling Cylinders Back
3.1 Front Bobbins
3.2 Rear Bobbins
4 Spacer (between Bobbins)
5 Drawing Unit
6 Ring Spinning Frame
7 Flyer Spool
8 Creel
9 Supporting Rod
10 Filament
1 1 Delivery Roller
12 Entry Roller
13 First Deflection Roller
14 Second Deflection Roller
1 5 Supporting Rack
16 Arrow indicating lateral travelling of filament
17 Arm
18 Base Element
19 Fixation Beam
20 Holder
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