Title of Invention

WEB DOFFING AND SUPPORTING DEVICE AT THE OUTLET OF A TEXTILE CARDING MACHINE

Abstract The invention disclosed in this application relates to a web doffing and supporting device at the outlet of a textile carding machine. Web emerging from the crush rollers (3,3') is gathered by the web collecting sheet ( 2 ) provided with preformed condenser .Said web collecting is mounted on the frame of the web doffing and supporting device at the outlet of a textile carding machine (1) . Said crush rollers (3,3') are driven at pre determined speed through the doffer drive and the web is delivered to the condenser (4) positioned downstream of said web collecting sheet (2).The web condensed by said condenser (4) is presented to the nip between top calender roller (5) driven by an independent variable speed motor (6) and bottom calender roller (7) driven by friction means for the delivery of the sliver downstream to the nip between a pair of coiler calender rollers (10,10').
Full Text The invention relates to a Web doffing and supporting device at the outlet of a Textile carding machine. This invention is more particularly directed to a device for taking off and gathering of fibre web discharged by a fibre delivery mechanism of the textile carding machine with built in dedicated drive for driving the delivery calendar rollers present downstream of the machine immediately after the condenser.
The Carding machines are provided with feeding device comprising a feed roller and a feed plate cooperating therewith. The fibre batt supplied to the carding machine is firmly held between the feed roller and the feed plate and due to the rotation of the feed roller the fibre batt is slowly advanced into the licker-in zone. The Carding machines are provided with a licker-in roller. The fibre batt is opened by the clothing of the licker in roller and the opened fibres are carried by the licker- in roller and delivered to the card cylinder, clothed with wire points for subsequent opening and so on. For the removal of waste and dirt from the opened batt, stationary carding elements, also known as combing segment associated with mote knife and discharge opening is present in the carding machine.
The lickerin roller present immediately next to the feed roller rotates significantly faster than the feed roller and the fibres opened by the licker-in passes through the stationary carding element, mote knife and the discharge opening present in the licker-in under casing zone. The opened fibres carried by the licker-in roller is further opened by the stationary carding elements gently. The loose fibres carried by the licker- in roller is stripped by the mote knife and dropped in to the discharge opening, which may be collected in a chamber provided and removed by suitable suction means. The fibre material is subsequently carried by the card cylinder. The fibres carried by the cylinder in cooperation with revolving flats is fully opened and parallelized . The fibres are subsequently doffed by the doffer and detaching device and presented to the calendar roller pair in sliver form, through a web doffing device which is normally present in high production cards . The detaching device is arranged downstream to the doffer Normally the detaching device comprises a redirecting roller and a pair of crush rollers and driven by the doffer drive system of the carding machine at a pre determined speed. A top and bottom calendar roller, which forms the calendar roller pair being located at the out let of the carding machine. Generally the calendar rollers are also driven by the doffer drive system at a pre determined speed. The sliver delivered by the calendar rollers is transferred to the revolving sliver cans through the coiler calendar rollers and can coiler.
The web delivered by the carding machine is very thin and web gathering devices are in use in modem high production carding machines to minimize sagging of the web

which is being delivered by the crush rollers to the calendar rollers through a condenser.
One such known device for gathering the fibre web discharged by the fibre delivery mechanism employing transverse conveyor is known. In this device the fibre emerging from the nip of at least two rotating rollers is deposited in the top run of one or two transverse conveyor which moves axially of the roll between guide rollers in order to convey the fibre web laterally away for the card. In practice it has been found very advantageous to use a transverse conveyor for guiding the fibre to one end of the card or to the middle of the card by using two transverse conveyor, after which the web is turned through about 90° at the turning place of the transverse conveyor and is conveyed through a condenser to nip of the rotating delivery rollers. In practice, in the construction of many cards equipped with such transverse conveyors, particularly where the surface of the top run is inclined, a stationary guide plate is disposed on the longitudinal side of the top run facing the doffer, covers the gap between the top run and the adjacent rollers. However it has been found that fibre particles occur on the transverse conveyor at the edge of the fibre web. These pocket may work loose and travel along with the fibre web, and this has an adverse effect on the subsequent processing of the fibre. Such fibre packets are therefore undesirable. To overcome the problem of occurrence of fibre packets on the transverse conveyor at the edge of fibre web the use of transverse conveyor with shoulder of trapezoidal cross section with an inner side for guiding the web instead of the guide plates is known
The carding machines employing such traverse conveyors essentially requires a drive mechanism for driving to the transverse conveyors and the calendar rollers. The means of providing drive to the transverse conveyor from the doffer gearing is complicated and involves many drive element resulting in high cost and the requirement of more maintenance. For high speed application it is generally desirable that tension be applied to the web between the delivery roller and the sliver forming nip. In the known devices the calendar rollers are driven by gearing ofthe doffer and there exists limitation in adjusting the speed of the calendar rollers to incorporate necessary tension draft. Moreover the devices described above have limitations on the delivery speeds because of the gearings and mechanical components.
The present invention is directed towards a simple means for taking off and gathering of fibre web discharged by a fibre delivery mechanism of a Textile Carding machine to minimize the sagging of the web in the region between the pair of revolving crush rollers and pair of revolving calendar rollers without the use of traverse conveyor and the delivery calendar rollers present downstream immediately after the condenser of the present invention are driven by independent drive means. By this it is possible to use the web guiding and supporting device even at higher delivery speeds of the order 300 m/min and above.

Accordingly the invention provides a Web doffing and supporting device at the out let of a textile carding machine arranged in between a pair of revolving crush rollers and a pair of revolving calendar rollers, the said crush rollers being rotatably mounted on a detaching device and driven at a pre determined speed , the said pair of revolving calendar rollers rotatably mounted and located at the out let of 9 textile carding machine and driven at a pre determined speed , a condenser being arranged in between the said crush rollers and the said calendar rollers , characterized in that the web doffing and supporting device comprises a web collecting sheet which is being mounted on the frame of the said web doffing and supporting device and arranged at a distance 'D' downstream of the said crush rollers, the said condenser being mounted on the frame of the said web doffing and supporting device at a pre determined location in between the said web collecting sheet and the said calendar rollers , the said calendar rollers being rotatably mounted within the said web doffing and supporting device at a pre determined location and the said top calendar roller is driven by an independent variable speed motor .
The invention will be described in detail with reference to the accompanying drawings
Fig. 1 of the accompanying drawings partially illustrates the side view of the web doffing and supporting device according to the invention.
Fig. 2 of the accompanying drawings shows delivery roller arrangement according to the invention , with the sliver coiler schematically represented in it.
Fig. 3 of the accompanying drawings illustrates drive arrangement of the top colander roller and loading arrangement of the bottom calendar roller according to the invention.
Fig. 4 of the accompanying drawings illustrates the web doffing and supporting device according to the invention in working position .
Web emerging from the crush rollers(3,3') of the detaching device is extremely thm which is composed of interlocked individual fibres and which has a width approximately 1000 mm are gathered by the web collecting sheet ( 2 ) mounted on the frame of the web doffing and supporting device which is arranged downstream of the crush rollers { 3,3' ). Said crush rollers (3,3') are driven at pre determined speed through the doffer drive . The doffer is driven by an independent motor at pre determined speed in known way by a control system comprising input device, PLC and inverter. The web is taken to the condenser (4) positioned downstream of said web collecting sheet (2) which is being mounted on the web doffing and supporting device at a pre determined location. Said web collecting sheet (2) is provided with

preformed pre condenser with diameter greater than that of the opening provided at the material entry region of said condenser (4). To provide smooth flow of fibres with minimal fiiction and free from the deposition of wax, dirt or seed coat particles that are present in the fibre web, said web collecting sheet (2) may be made of a) plain or perforated stainless steel and coated with antifriction material eg. Teflon, b) plain or perforated stainless steel and electro polished c ) plain or perforated stainless steel polished and electro-plated d) made of glass.
The web condensed by said condenser (4) is presented to the nip between the calendar roller pair. Top calendar roller (5) is driven by an independent variable speed motor (6), which may be selected from an asynchronous gear motor, DC gear motor, AC servo motor or DC servo motor. Said top calendar roller (5) may be directly mounted on the shaft of the gear motor and driven or else it can be arranged in any one of the known methods and driven. Said variable speed motor (6) is driven in known way at pre determined speed by a control system comprising input device, PLC and inverter. The bottom calendar roller(7) is mounted on antifriction bearings, housed in the bottom calendar roller housing (8) . Said bottom calendar roller housing (8 ) is swingably arranged on a bracket. (9 ). Said bottom calendar roller(7) is driven by friction means by said revolving top calendar roller(5) and a nip is provided between said top calendar roller (5) and said bottom calendar roller(7) for the delivery of the sliver downstream to the nip between a pair of coiler calendar rollers (10,10') for further delivery of the sliver into a revolving sliver can(ll)through a can coiler(12).
Means are provided for sensing variation in distance between said top and bottom calendar rollers (5,7) due to variation in the mass of sliver delivered. A target (16) is rigidly fitted to the clamp (17) , which is rigidly fitted to said bottom calendar roller housing(8). A sensor (18 ) is fitted to the sensor clamp (19) and said sensor clamp (19) is rigidly fitted on the frame ( 20 ).The position of said sensor (18) can be set according to the requirement with respect to said target (16). The variation in the sliver mass between said revolving top and bottom calendar rollers (5,7) is sensed by said sensor (18) and said target (16) and the signal produced by said sensor(18) is used for the regulation of feed motor of the carding machine in known way.
Means are provided for varying the pressure between said top and bottom calendar rollers (5,7) through biasing of spring (13). The pressure between said top calendar roller (5) and said bottom colander roller ( 7) is set to pre-determined value according to the material, sliver count processed and the delivery speed to get linear
response from said sensor (18)
The entire web doffing and supporting device (1 ) comprising said web collectmg sheet(2 ) , said condenser (4), said variable speed motor (6) , and top calendar roller (5) , said bottom calendar roller (7), said frame (20) and the bearing arrangement of said bottom calendar roller (7) is hinged on both sides of the

delivery arrangement frame member (14,14') at a pre-determined position . Means are provided for radial swinging of said web doffing and supporting device (1) using suitable positioning device (15) , may be by a pneumatic cylinder .
During normal working of the machine, said web doffing device (1) is positioned in front of said crush rollers (3,3') such that said web collecting sheet (2 ) present at a predetermined position to guide the flow of web emerging from said crush rollers (3,3'). Whenever required eg. during piecing of the web , said web doffing and supporting device ( 1 ) can be positioned by said positioning device (15) at an inclination.
Another inventive feature of the invention is that said web collecting sheet (2) is positioned at a distance (D) from said crush rollers (3,3') to facilitate the release of air carried by the web delivered . To control the air flow, in the present invention means are provided for setting the distance ( D) between said web collecting sheet(2) and said crush rollers(3,3') in the range of 5 to 40mm according to different process parameters.
Since said top calendar roller (5 ) is driven by an independent variable speed motor(6) , it is possible to effect pre determined tension draft between said crush rollers ( 3,3') and said calendar rollers (5,7) at different delivery speeds. Also by this arrangement it possible to continuously vary the tension draft between said crush rollers (3,3') and said calendar roller (5,7), as the delivery speed progresses from slow speed to the pre-determined working speed.
Though this invention is hereinbefore described and illustrated with reference to specific embodiments, obvious alterations and modifications knovra to persons skilled in the art are well within the scope of the appended claims.


WE CLAIM
1. Web doffing and supporting device at the out let of a textile carding rnachine arranged in between a pair of revolving crush rollers (3,3') and a pair of revolving calendar rollers (5,7) , the said crush rollers (3,3') being rotatably mounted on a detaching device and driven at a pre determined speed , the said pair of revolving calendar rollers (5,7) rotatably mounted and located at the out let of a textile carding machine and driven at a pre determined speed , a condenser (4) being arranged in between the said crush rollers (3,3') and the said calendar rollers (5,7), characterized in that the web doffing and supporting device (1) comprises a web collecting sheet (2 ) which is being mounted on the frame of the said web doffing and supporting device and arranged at a distance 'D' downstream of the said crush rollers (3,3') , the said condenser (4) being mounted on the frame of the said web doffing and supporting device at a pre determined location in between the said web collecting sheet (2 ) and the said calendar rollers (5,7), the said calendar rollers (5,7) being rotatably mounted within the said web doffing and supporting device at a pre determined location and the said top calendar roller (5) being driven by an independent variable speed motor (6).
2. Web doffing and supporting device at the outlet of a textile carding machine as claimed in claim 1 , wherein the said variable speed motor (6) is an asynchronous gear motor or DC gear motor.
3. Web doffing and supporting device at the outlet of a textile carding machine as claimed in claim 1 and 2 , wherein the said variable speed motor (6) is a AC servo motor or DC servo motor.
4. Web doffing and supporting device at the outlet of a textile carding machine as claimed in claim 1 ,wherein said web collecting sheet (2) is made of plain or perforated stainless steel material and coated with antifriction material.
5. Web doffing and supporting device at the outlet of a textile carding machine as claimed in claim 1 and 4, wherein said web collecting sheet (2) is made of plain or perforated stainless steel material and electro polished.
6. Web doffing and supporting device at the outlet of a textile carding machine as claimed in claim 1, 4 and 5 wherein said web collecting sheet (2) is made of glass.
7. Web doffing and supporting device at the outlet of a textile carding machine as claimed in claim 1 and 4 to 6 wherein said web collecting sheet (2) is provided with preformed pre condenser with diameter greater than that of the opening provided at the material entry region ofthe condenser (4).
8. Web doffing and supporting device at the outlet of a textile carding machine as claimed in claim 1 wherein the distance 'D' is in the range of 5 to 40 mm.

9. Web doffing and supporting device at the outlet of a textile carding machine as claimed in claim 1 wherein the said top calendar roller (5) is directly mounted on the shaft of the variable speed motor (6).
10. Web doffing and supporting device at the outlet of a textile carding machine as claimed in claim 1 wherein the said bottom calendar roller (7) is swingably mounted on a bracket (9).
11. Web dofFmg and supporting device at the outlet of a textile carding machine
substantially as herein described with reference to the figures 1 to 4 of the drawings
accompanying this specification.


Documents:

914-mas-2002 abstract granted.pdf

914-mas-2002 abstract.pdf

914-mas-2002 claims ) granted.pdf

914-mas-2002 claims duplicate.pdf

914-mas-2002 claims.pdf

914-mas-2002 correspondence others.pdf

914-mas-2002 correspondence po.pdf

914-mas-2002 description (complete) duplicate.pdf

914-mas-2002 description (complete) granted.pdf

914-mas-2002 description (complete).pdf

914-mas-2002 description (provisional).pdf

914-mas-2002 drawings duplicate.pdf

914-mas-2002 drawings.pdf

914-mas-2002 form-1.pdf

914-mas-2002 form-19.pdf

914-mas-2002 form-3.pdf

914-mas-2002 form-5.pdf


Patent Number 201025
Indian Patent Application Number 914/MAS/2002
PG Journal Number 8/2007
Publication Date 23-Feb-2007
Grant Date 16-Jun-2006
Date of Filing 09-Dec-2002
Name of Patentee M/S. LAKSHMI MACHINE WORKS LIMITED
Applicant Address PERIANAICKENPALAYAM, COIMBATORE 641 020
Inventors:
# Inventor's Name Inventor's Address
1 PERIASWAMY LAKSHMI NARASIMHAN M/S. LAKSHMI MACHINE WORKS LIMITED, PERIANAICKENPALAYAM, COIMBATORE 641 020,
2 GOPALAN BALASUNDARAM M/S. LAKSHMI MACHINE WORKS LIMITED, PERIANAICKENPALAYAM, COIMBATORE 641 020, TAMILNADU
3 KONDASWAMY RADHAKRISHNAN M/S. LAKSHMI MACHINE WORKS LIMITED, PERIANAICKENPALAYAM, COIMBATORE 641 020, TAMILNADU
PCT International Classification Number D01G15/46
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA