FIELD OF THE INVENTION
The present invention relates to a can coiler for textile spinning preparation machine such as card, comber and draw frames, for depositing the sliver gentiy in the sliver cans at higher delivery speeds.
BACKGROUND ART
Use of can coilers is known in a textile spinning preparation machine such as card, comber and draw frames for depositing sliver gentiy in a sliver can. Normally the cans are kept over a revolving table and rotated at a pre-determined speed by the drive system of the textile machine. Likewise, the can coiler comprising a sliver canal and a bottom surface which constantly rubs the top layers of the slivers deposited in the sliver can is also rotated at a pre-determined speed by the drive system of the textile machine. For proper deposition of the sliver, the bottom surface of the can coiler is provided with a pre-determined surface roughness. The surface roughness changes due to constant rubbing of the bottom surface of the can coiler with the sliver material which is held against the bottom surface of the can coiler by pre-determined spring force exerted by the springs arranged in the sliver cans. Due to the above phenomena, the bottom side of the can coiler smoothens over a period of time. Particularly, in case of processing a synthetic material, the bottom side smoothens within a very short period. This results in improper coiling and also throwing of the sliver outside the can.

OBJECT OF THE INVENTION:
It is an object of the invention to provide a can coiler with improved bottom surface which retains its surface roughness for a long period of time.
It is an object of the invention to provide a can coiler suitable for processing synthetic material without affecting the quality of sliver produced.
It is an object of the invention to provide a method for treating a can coiler with improved bottom surface.
SUMMARY OF THE INVENTION
In order to overcome the disadvantages of the prior art and to retain surface roughness for a longer period of time, the present invention provides for a method for treating can coiler bottom surface comprising machining the bottom surface of the can coiler smd subjecting said bottom surface of said can coiler to electrolytic plasma oxidation.
According to another embodiment, the present invention provides for an improved can coiler for depositing a textile fiber sliver for a spinning preparation machine, said coiler comprising: a sliver depositing channel, coiler plate with an aperture defining sliver inlet opening on a head side, an outlet aperture at an end of said sliver depositing channel, wherein the bottom surface layer of the said can coiler is oxidized with electrol3rtic plasma oxidation.

^ BklEF DESCRIPTION OF THE DRAWINGS
Figure 1 illustrates a coiler device incorporated with can coiler constructed according to one of the embodiments of the present invention.
Figure 2 of the drawings shows the can coiler constructed according to one of the embodiments of the present invention.
DETAILED DESCRIPTJON OF THE INVENTION
The present invention is described hereinafter by various embodiments with reference to the accompanying drawings, wherein reference numerals used in the accompanying drawings correspond to the like elements throughout the description.
Fig. 1 illustrates a coiler device 1 for depositing a textile fiber sliver 2 for a spinning preparation machine having a can coiler 10 provided with a sliver depositing channel 14, with an aperture which defines sliver inlet opening 11 on a head side, an outlet aperture 12 at an end of said sliver depositing channel 14, wherein said can coiler bottom surface 13 is machined to a pre-determined surface roughness in any one of the known methods and subjected to electrolytic plasma oxidation process to obtain the surface finish of 0.8 to 2.2 microns and surface hardness of 600 to 1800 HV (Vickers's Hardness).
The can coUer 10 is preferably made of aluminum material and rotatably mounted on a frame 4 which also supports the feed rollers 5,5'. The fiber sliver 2 is led

through these feed rollers 5,5' into the coiler device 1 which is provided with can coiler 10 containing said sliver depositing channel 14.
Sliver can 6 is rotatably supported on the can plate 7 and located under the can coiler 10. The can coiler 10 and the can plate 7 are drivingly connected to the drive system of the machine and driven at the pre determined speed to facilitate the deposition of the sliver in to the sliver can 6.
The sliver can 6 comprises a collecting plate 8 which is held by a spring 9 positioned inside the sliver can 6. During the deposition of the fiber sliver 2 into a sliver can 6, the fibre sliver 2 is delivered generally in the shape of coils and deposited in the collecting plate 8 of the sliver can 6. Over a period of time when the sliver can 6 is filled with more and more quantity of sliver, the top most layer of the sfiver material deposited in the sliver can 6 rubs the bottom surface 13 of can coiler 10 which affects the surface roughness of the bottom surface 13 of the can coiler 10.
According to one embodiment of the present invention as illustrated in Fig. 2, the bottom surface 13 of the can coiler 10 is machined to the pre-determined surface roughness by any one of the known methods. Subsequently the bottom surface 13 of the can coiler 10 is subjected to the Electrolytic Plasma Oxidation process.
According to another embodiment of the present invention, the metalHc layer of bottom surface 13 of said can coiler 10 is wax polished after the step of subjecting said bottom surface 13 to electrolytic plasma oxidation, thereby rendering the metallic layer of bottom surface 13 of said can coiler 10 to a pre-determined surface roughness and hardness. The surface finish may vary from 0.8 to 2.2 microns and the surface hardness may vary from 600 to 1800 HV (Vicker's Hardness).

dvantageously, by this process the bottom surface 13 of the can coiler 10 is icorporated with an optimal surface roughness and surface hardness which cilitates proper coiling of the sliver 2 into the sliver can 6 without affecting the lality. At the same time the roughness and hardness of the bottom surface 13 of le can coiler 10 is retained for a considerably longer time period.
arious modifications to these embodiments will be readily apparent to those skilled the art, and the generic principles defined herein may be applied to other nbodiments. Thus, the description is not intended to be limited to the nbodiments shown herein but is to be accorded the widest scope consistent with le principles and novel features disclosed herein.

We claim:
1. A method of treating can coiler bottom surface (13), comprising the steps of: machining the bottom surface (13) of the can coiler (10); and subjecting said bottom surface (13) of said can coiler (10 ) to an electrol3rtic plasma oxidation.
2. The method as claimed in claim 1, wherein the bottom surface (13) of the can
coiler (10) is machined to a surface finish varying from 0.8 to 2.2 micron s.
3. The method as claimed in claim 1, wherein said bottom surface (13) of said
can coiler (10) is subjected to wax polishing after the electrolytic plasma
oxidation.
4. The method as claimed in claim 1, wherein the metallic layer of bottom
surface (13) of said can coiler (10) has a surface hardness vaiying from 600 to
1800 HV (Vickers's Hardness).
5. An improved coiler device (1) in a spinning preparation machine for depositing
a textile fiber sliver (2), said coiler device (1) comprising:
can coiler (10) with a bottom surface (13) having sliver depositing channel (14) with an aperture defining sliver inlet opening (11) on a head side; and an outlet aperture (12) at an end of said sliver depositing channel (14), wherein the bottom surface (13) of the said bottom surface is oxidized by electrolytic plasma oxidation.