This application claims priority from German Patent Application No. 10 2006 005 389.3 dated Feb. 3, 2006, the entire disclosure of which is incorporated herein by reference.
The invention relates to an apparatus on a textile machine, for example, a flat card, roller card or the like, for cleaning fibre material, for example of cotton.
There is described in WO 01/92614 (also published as EP 1 290 252 B) a carding machine comprising a high-speed first or main roller, which is so adapted that it supports or conveys a travelling fibre web, associated second and third rollers, which have respective nips with one another and with the first roller on rotation of the three rollers, and drive means for rotation of the rollers, which drive means are so arranged that the second roller is rotated in a direction of rotation that is the same as that of the first roller and opposite to that of the third roller, wherein the second roller is arranged downstream of the third roller and co-operates with the first roller so that a fibre mat is opened and detached, the fibre mat is transferred to the nip with the third roller and is conveyed by the third roller to the nip with the first roller, where it is transferred back to the first roller, a separating knife being arranged downstream—seen in the direction of rotation of the first roller—of the second roller.
In that known apparatus (EP 1 290 252 B1), collecting and/or conducting means are provided to collect waste or contaminant material that has been separated from the fibre web during operation of the rollers. Closely adjacent or alongside the second roller (inverter) there is arranged a collection plate for collecting the contaminated material. The contaminated material is intended to be conveyed away from the collection plate.
It is an aim of the invention to provide an apparatus in which the degree of cleaning is considerably increased.
The invention provides an apparatus on a textile machine for cleaning fibre material, wherein the apparatus comprises:
As a result of the measures taken according to the invention, the degree of cleaning is very considerably increased. Despite the extremely large opening between the knife edge and the constriction of the second roller relative to the first roller located opposite, very high black contents are achieved with large amounts of waste. That is surprising in the respect that the separating knife is likewise arranged spaced apart from the fibre web.
The clothing tips may be, for example, in the form of teeth or needles. The first roller, the second roller and the third roller may have a clothing on their cylindrical outer surface, the tips of which are advantageously inclined in the direction of rotation. In one embodiment of the invention, on transition of the fibres from the second roller to the third roller the tips of the rollers are inclined in the same direction. Suitable dimensions of the second and third rollers may vary, for example, according to the diameter of the first roller. In one exemplary embodiment, the diameter of the second roller may be about from 50 to 140 mm, whilst the diameter of the third roller may be about from 60 to 90 mm. Suitable rotational speeds for the second and third rollers may be selected having regard to the speed of rotation of the first roller. By way of example, the second roller may have a rotational speed of about from 0.5 to 2 rev/min and/or the third roller may have a rotational speed of about from 5 to 15 rev/min. It is preferred for the circumferential speed of the second roller to be low in comparison with the first roller. In one embodiment, the circumferential speed of the third roller is higher than the speed of the second roller but lower than the speed of the first roller. If desired, a separation opening having a width of about from 40 to 50 mm may be arranged downstream—seen in the direction of rotation of the first roller—of the second roller. Where present, the separation opening advantageously has a separating knife or the like, and/or may be associated with a suction device, for example a suction hood, for trash or the like. In a preferred embodiment, the clothing gaps, that is, the gaps between adjacent tips, are large. That allows a higher filling volume of fibres on the roller. In one embodiment, the volume that can become filled by fibres comprises the region between the free ends of the tips and the bottom of the tips. In another embodiment, the volume that can become filled by fibres consists essentially of the space between the tips of the clothing and the foot of the clothing. In one advantageous embodiment, the point density of the clothing on the second roller is low, for example, less than or equal to 140 ppsi.
In one preferred embodiment, the front angle is about from 40 to 50°. The clothing height may be, for example, about from 4 to 5 mm. The clothings may be of any suitable material or materials. Advantageously, at least some of the clothings are all-steel clothings. Advantageously, at least some of the clothings are flexible clothings. The apparatus of the invention may be used at any fibre-transporting roller at which cleaning of fibre is carried out. Advantageously, the first roller is the or a licker-in of a flat card or roller card. In a case of a licker-in group consisting of three lickers-in arranged one after the other, the first roller is advantageously the licker-in arranged in the middle.
In a further embodiment of the invention, the first roller is a carding cylinder and the second roller is a worker roller, and the direction of rotation of the second roller is opposed to the direction of rotation of the first roller and the same as the direction of rotation of the third roller.
The invention also provides an apparatus on a flat card, roller card or the like for cleaning fibre material, for example of cotton, comprising a high-speed first or main roller which is adapted to support or convey a travelling fibre web, associated second and third rollers, which have respective nips with one another and with the first roller on rotation of the rollers, and rive means for rotation of the rollers, which drive means are so arranged that the second roller is rotated in a direction of rotation that is the same as that of the first roller and opposite to that of the third roller, wherein the second roller is arranged downstream of the third roller and so co-operates with the first roller that a fibre mat is opened and detached, the fibre mat is transferred to the nip with the third roller and is conveyed by the third roller to the nip with the first roller, where it is transferred back to the first roller, a separating knife being arranged downstream—seen in the direction of rotation of the first or main roller—of the second roller, wherein between the edge of the separating knife and the nip of the first or main roller with the second roller there is a separation opening having a width of about from 40 to 60 mm.
In another embodiment, the invention provides an apparatus on a flat card, roller card or the like for cleaning fibre material, for example cotton, comprising a high-speed cylinder which is adapted to support or convey a travelling fibre web, associated second and third rollers, which have respective nips with one another and with the first roller on rotation of the rollers, and drive means for rotation of the rollers, wherein the second roller is arranged downstream of the third roller and so co-operates with the cylinder that a fibre mat is opened and detached, the fibre mat is transferred to the nip with the third roller and is conveyed by the third roller to the nip with the cylinder, where it is transferred back to the cylinder, the rollers having a clothing with needles or teeth which are inclined at an acute angle (front angle) in the direction of rotation, and in the region of the transition of the fibres from the cylinder to the second roller the needles or teeth of the rollers in question being inclined in different directions and the speed of the second roller being low in comparison with the speed of the cylinder, in which the second roller is a worker roller and is rotated in a direction of rotation which is opposite to that of the cylinder and the same as that of the third roller.
a, 4b are a side view (4a) and a front view in section (4b) of the clothing of the second roller (inverter) of the apparatus of
With reference to
Referring to
As shown in
In accordance with
Reference numeral 28 indicates the clothing gaps between teeth 182 located one after the other in the direction in which the clothing extends and reference numeral 29 indicates the clothing gaps between teeth 182 located one next to the other.
The invention has been explained using the example of a flat card. Its use in other machines that clean fibre material, for example, roller cards, cleaners or the like, is also included.
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