Title of Invention

"A DRAFTOMETER"

Abstract This invention provides a draftometer for measuring drafting or strething force of assembly of discontinuous or continuous materials such as fibres which is essentially required to set the spinning process and fibre parameters for manufacturing continous strands. The instrument simulates the actual conditions of drafting/stretching. The instrument incorporates additional features which enable adjusting the distance between front and back roller, controlling the speed of the roller and adjusting the nip pressure.
Full Text FIELD OF INVENTION
This invention relates to a draftometer for measuring drafting or stretching force of assembly of discontinuous or continuous materials such as fibres under dynamic conditions which is required to set the processing parameters for manufacturing continuous strand as well as to set the fibre parameters,
PRIOR ART
The forces acting on a fibre during the drafting operation are generally determined by neasuring the total drafting force required to cause the fibres to slide past one another as the number of fibres in the strand is attenuated in the drafting zone. It has been now realised that dynamic methods of measuring drafting force are more realistic as the test material is subjected to a drafting process in a manner very similar to that occuring in actual spinning operations.
An instrument known in the art as per US Patent no. 3,005,340 is Fibre Drafting Force Analyser which utilises a floating roller. The input direction of the sliver is kept horizontal whereas the output direction is kept verticle. Sliver coming form back roller is wrapped around the floating roller and drawn through front roller.
A drawback of the above instrument is that wrapping around floating roller distorts the actual drafting process and leads to inaccurate measurement of drafting force.
Another drawback of the above instrument is that the mechanism of the instrument does not simulate the actual drafting conditions of the spinning machine.
Another comparable instrument known in the art is 'West Point Cohesion tester' by Graham for automatic analysis of the variation in the sliver drafting force. The drafting and sensing elements consist of a spring loaded two roll drafting system and two LVDT stress transducers, each connected to a separate amplifier. The distance between two sets of rollers changes during the drafting and the resultant change in the distance between the rollers is the measure of drafting force.
A disadvantage of the above instrument is that it does not simulate the actual drafting conditions during spinning. In actual drafting conditions, the distance between the rollers is fixed because changing the distance between the rollers causes disturbances in drafting which results error in the measurements of drafting force.
OBJECTS OF PRESENT INVENTION
An object of the present invention is to provide a draftometer for measuring drafting force of rovings and slivers under dynamic conditions.
Another object of the present invention is to provide a draftometer with linear arragenment of rollers.
Futher object of the present invention is to provide a draftometer wherein the distance between front and back roller can be adjusted which enables measurememt of drafting/ stretching force far wide range of fibre lengths.
Still further object of the present invention is to provide a draftometer wherein the speed of the rollers can be controlled which enables adjustment of the draft and the drafting speed which sinulates the actule drafting / stretching conditions.
Yet further object of the present invention is to provide a draftometer wherein the pressure on the top rollers can be adjusted which enables to control the motion of sliver or roving.
DESCRIPTION OF FIGURES
The invention is illustrated with an accompanying figure which illustrates an embodiment of the present invention. It is to be understood that the principles and features of the present invention can be employed in numerous embodiments by making changes, modifications and adaptations in the layout or construction of individual components of the instrument. Such variant embodiments are intended to the within the scope of the present invention. The accompanying figure:
Fig. 1: Shows the layout of the draftometer of the present invention. STATEMENT OF INVENTION
The present invention provides a draftometer for measuring drafting force of sliver and roving which are essential for adjusting process and fibre parameters during spinning. The instrument simulates the actual conditions of spinning machines. The instrument has the additional features that the distance between front and back rollers can be adjusted and also we speed of the rollers can be controlled so that the draft and drafting speed can be adjusted. Further the pressure on the top of rollers can be adjusted to control the motion of sliver and roving.
DESCRIPTION OF INVENTION WITH REFERENCE TO DRAWINGS
Referring to Fig. 1, the instrument of the present invention comprises two sets of rollers namely back top roller (6), back bottom roller (7), front top roller (10) and
front bottom roller (11). A motor (5) drives the front bottom roller (11) and the motor (21) drives the back-bottom roller (7). The distance between the two sets of rollers can be adjusted as required by roller-setting arrangement (3). The top roller pressure arrangements (8,9) to provide nip pressure by sutable arrangement like spring loads. The suction arrangement (13) & (14) with switch oft7on (12) comprises of the compressed air tube (13) and delivery arrangement (14). The compressed air is fed through (13) to the delivery arrangement (14) which collects the tested material coming from the front roller set (10,11). The material sample holder (1) holds the material package (2) and material guide (4) guides the material. The power drawn by motor (5), without any material, is first sensed by the speed controller (17,18) and is stored in computer (19) having printer (20). Afterwards, when the material such as roving or sliver, is drafted, the power drawn by the motor (5) increases. This increase in power drawn by motor (5) is due to the drafting or stretching force of the material. This increased power drawn is then sensed by Control panel (22), having start switch (15) and stop switch (16), and is measured by computer (19). The difference between the two measurements of power outputs, one without any material and the other with material, is the measure of the drafting or stretching force.
It is to be understood that the invention is susceptible to modification, changes, adaptations by those skilled in the art. Such changes, adaptations, modificaions are intended to be within the scope of the present invention, which is further set forth under the following claims:



WE CLAIM:
1. A draftometer for measuring drafting or stretching force of assembly of discontinuous or continuous materials .such as fibres under dynamic conditions where-in the instrument comprises:
- two sets of roller consisting of back-top roller (6), back bottom roller
(7), front top roller (10) and front bottom roller (11);
- two motors (5,21) wherein motor (5) drives the front bottom roller (11)
and motor (21) drives the back-bottom roller (7);

- a roller-setting arrangement (3);
- nip pressure arrangements (8,9);
- suction arrangement (13,14) with ofFon switch (12) consisting of the
compressed air tube (13) and delivery arrangement (14);

- Control panel (22) comprising speed controller (17,18), start switch
(15) and stop switch (16);
- material feeding arangement consisting of material sample holder (1),
material package (2) and material guide (5);
- computer (19) with printer (20);
2. A draftometer for measuring drafting or stretching force of assembly of discontinuous or continuous materials such as fibres, as substantially herein described and illustrated.

Documents:

1189-del-2002-abstract.pdf

1189-del-2002-claims.pdf

1189-DEL-2002-Correspondence-Others (24-10-2007).pdf

1189-DEL-2002-Description (Complete) (24-10-2007).pdf

1189-del-2002-drawings.pdf

1189-del-2002-form-1.pdf

1189-del-2002-form-18.pdf

1189-DEL-2002-Form-2 (24-10-2007).pdf

1189-DEL-2002-Form-3 (24-10-2007).pdf

1189-del-2002-gpa.pdf


Patent Number 221976
Indian Patent Application Number 1189/DEL/2002
PG Journal Number 32/2008
Publication Date 08-Aug-2008
Grant Date 12-Jul-2008
Date of Filing 26-Nov-2002
Name of Patentee NORTHERN INDIA TEXTILE RESEARCH ASSOCIATION
Applicant Address SECTOR-23, RAJ NAGAR, GHAZIABAD-201002, U.P., INDIA.
Inventors:
# Inventor's Name Inventor's Address
1 APURBA DAS, VIKAS SHARMA AND PANKAJ YADAV NORTHERN INDIA TEXTILE RESEARCH ASSOCIATION, SECTOR-23, RAJ NAGAR, GHAZIABAD-201002, U.P., INDIA.
PCT International Classification Number B43L13/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA