Title of Invention

A CLOSED-LOOP MEASUREMENT SYSTEM REGULATING FLYER'S SPEED OF A SPINNING MACHINE

Abstract The invention relates to a closed-loop measurement system having a control device for regulating flyer's speed of a spinning machine, the system comprising a three - phase A. c. supply source (1) for feeding a shunt - field circuit (3) of a d. c. motor via a rectifier circuit (2), the supply source (1) further feeding a set of silicon controlled rectifiers which is fed to an armature (5) of the d. c. motor which drives a spinning machine (6), the spinning machine (6) having a rotatable drum (8) with a main shaft (7); and a slotted disk (9) rigidly fixed on the drum (8), and being rotatable in registration with the rotating speed of the drum (8); atleast one infrared light source (10) provided on a first side of the disk (8); an infrared light sensor (11) placed on a second side of the disk (8) such that the sensor (11) produces a high binary state of voltage when any of the plurality slots of the rotating drum (8) reaches beneath the operating zone of the infrared light source (10) and the sensor (11) indicating the speed of the drum (8); characterized by comprising a controller (16) receiving the feed back pulses from the sensor (11) and setting a desired speed of the d. c. motor, the controller (16) regulating the desired motor speed including the flyer's speed by monitoring and controlling a firing angle of the set of rectifiers (4) via a firing circuit (17).
Full Text 2 FIELD OF THE INVENTION
The present invention generally relates to jute processing machineries. More particularly, the invention relates to a closed-loop measurement system and a control device for regulating flyer's speed of a spinning machine.
BACKGROUND OF THE INVENTION
Jute industry is a traditional agro-based industry and is one of the leading foreign exchange earner providing direct and indirect employment to millions of people in the country. From the time of inception, the industry is producing traditional twine and fabrics like hessian, sacking and carpet backing cloths. Hence the processing machineries are basically huge, mechanical, robust and driven by a. c. prime movers utilizing number of mechanical attachments and fittings.
The jute industry had been facing stiff global competition during the recent past from the industries with its counterparts producing different synthetics specially HDPE and PP. However, presently demand for diversified value-added jute products are increasing day by day. To cope up with the demand of the day, it is essential to blend different natural and man-made fibres with jute to produce new end products.
The problem arises that the delicate structure and fineness of other natural and man-made fibres generally do not allow them to undergo the harsh and speedy processing caused by the mechanical moving parts of existing jute processing machineries. Thus, it is necessary to control and regulate the high speed of all

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the machines in correspondence with the processing parameters of different fibre quality and the linear density of the yarn to be spun. It has also been observed that fibres like viscose waste, coconut fibre, silk waste fibre etc. can be easily blended with jute by minor addition, alteration of the process steps and operational sequences of the processing machineries.
Jute processing machineries mainly comprise a softner, a carding, atleast three passages of drawing and a spinning frame to convert raw jute fibre into jute yarn. All the machines run at very high speed which is not suitable for delicate fibres except that for jute only. Thus, it is essential to control and regulate the speed of the machines depending on the quality of the component fibres in the blend and the linear density of the yarn to be spun.
In order to control the speed of the moving parts, firstly it is necessary to provide speed indicators including auto speed controllers.
Speed of the jute spinning frame is generally represented by its flyer's speed. Hence to control the speed of the spinning machine, it would be necessary to regulate the speed of the spinning frame interalia the flyer's speed.
A higher end breakage rate in jute spinning frame is the most critical problem of the industry, which leads to low productivity, poor quality and unnecessary dirtiness. However, it is possible to spin poor quality fibre and some of its blends with other fibres into a regular yarn, if the machine is run at a regulated speed. The speed required is dependent on the quality and type of fibres to be spunned. Normally, a spinning frame runs at a speed range of 3600 to 4600 rpm.

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The flyer of a jute spinning frame revolves centering a fixed spindle / or bobbin holder. A driving motor assigned to the spinning frame drives a horizontally placed revolving drum by a flat leather belt. The drum drives the flyer wharves by tapes through a jocky-pulley and hence the flyer gets the motion. The flyer speed of the spinning frame remains in between 3600 r. p. m. to 4200 r. p. m., depending on the fibre quality used and the linear density of the yarn to be spun. Conventional devices use a tachometer to measure the rotational speed.
As the flyer is required to run at different speeds to spin yarns from different fibres for different applications, the conventional devices regulate the speed by manually slackening or tightening the flat leather belt.
Thus, the prior art machines have the disadvantages for example, the speed of the flyer vis-a-vis the spinning frame cannot be effectively and directly controlled in absence of an appropriate control mechanism. Further, the machines do not have any means for instant start-up or stopping. Even the machines lack provision of a speed indicator.
OBJECTS OF THE INVENTION
It is therefore an object of the invention to propose a closed-loop measurement system having a control device for regulating flyer's speed of a spinning machine which eliminates the disadvantages of the prior art.
Another object of the invention to propose a closed-loop measurement system having a control device for regulating flyer's speed of a spinning machine which comprises a direct speed control arrangement.

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An yet another object of the invention to propose a closed-loop measurement system having a control device for regulating flyer's speed of a spinning machine which provides both auto and manual facilities to set the mode of speed control of the spinning machine.
A still another object of the invention to propose a closed-loop measurement system having a control device for regulating flyer's speed of a spinning machine which provides a direct display of motor speed and the flyer's speed separately.
A further object of the invention to propose a closed-loop measurement system having a control device for regulating flyer's speed of a spinning machine which is equipped with digital speed set facility.
A still further object of the invention to propose a closed-loop measurement system having a control device for regulating flyer's speed of a spinning machine which is provided with means for remote on / off.
SUMMARY OF THE INVENTION
To provide a closed loop system and impart control action a set of Silicon Controlled Rectifiers (Thyristors) are used to provide the controlled rectified d.c. voltage to the armature circuit of a separately excited d. c. motor with over current protection. For protection, a fly wheel diode and a snubber circuit has also been provided. The feed back is obtained from a infrared light sensor in conjunction with a slotted bakelite disk attached with a shaft of the d.c. motor. This signal is analysed in a control unit and is used to control the firing angle of the Silicon Controlled Rectifiers (SCRs).

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In the field circuit of the motor, a smoothed rectified uncontrolled d.c supply is provided.
In the main unit a switch has been provided to get option for Manual/Automatic speed control arrangement. An Up/Down counter has also been used to set the desired speed.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Figure 1 shows a block diagram of a closed-loop measurement system having a control device for regulating the flyer speed of the Spinning machine according to the present invention. Figure 2 shows a schematic diagram of the speed sensing device of the system according to the invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
In Figure 1, it is shown that, from a 3 phase A.C. supply (1), a rectifier circuit (2) is used in order to feed a shunt field circuit (3) of a d. c. motor (not shown). The A.c 3 phase supply (1) is further fed to a set of silicon controlled rectifiers (4) to get a controlled d. c. voltage which is fed to an armature (5) of the d. c. motor. The d. c. motor drives a spinning machine (6).
On a main shaft (7) of a drum (8) of the spinning machine (6), a bakelite slotted disk (9) is rigidly fixed which rotates with the drum (8). In both sides of the slotted disk (9), one each infrared light source (10) is placed and in the other

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side of the disk (9) an infrared light sensor (11) is placed. So when any slot of the moving disk (9) comes under the line of the infrared light source (10) and the sensor (11), a 'high' binary state of voltage is produced in the sensor (11). Thus, the number of pulses coming out from the sensor (11) in one minute time span indicates the speed of the drum (8) in r. p. m. In order to get the correct value of the speed, this value is scaled up using a phased locked loop (PLL) circuit (12) via a counter decoder and driver (13). By adapting a latch and hold circuit (14), this value is shown to 4 - digit numbers of a 7 segment digital display means (15) which indicates the motor speed.
The same train of pulses coming out from the infrared light sensor (11) is also accepted as the feedback to a controller circuit (16) having Manual (MM) or Auto mode (AM) of operation. Accordingly a desired speed of the d. c. motor can be set from these two parameters, i.e. the set point parameter and the input feedback parameter. The control circuit (16) controls firing angle of the SCRs via a firing circuit (17) of the controlled rectifier circuit (4) and thereby maintains the required speed of the d. c. motor and the spinning drum (8).
In figure 2, the arrangement of the slotted disk (9) is shown. The slotted disk (9) can be configured with a plurality of slots, for example, 70 numbers, preferably 60 numbers, more particularly 50 numbers. The slot size is configurable with a diameter (d) between 25 to 35 mm and width (W) between 8 to 12 mm. A plurality of fixing screws (18) are adapted for fixing the slotted disk (9) with the drum (8).

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We Claim
1. A closed-loop measurement system having a control device for regulating flyer's speed of a spinning machine, the system comprising:
- a three - phase A. c. supply source (1) for feeding a shunt - field
circuit (3) of a d. c. motor via a rectifier circuit (2), the supply
source (1) further feeding a set of silicon controlled rectifiers which
is fed to an armature (5) of the d. c. motor which drives a spinning
machine (6), the spinning machine (6) having a rotatable drum (8)
with a main shaft (7); and
- a control device comprising a slotted disk (9) rigidly fixed on the
drum (8), and being rotatable in registration with the rotating
speed of the drum (8); atleast one infrared light source (10)
provided on one side of the disk (8); an infrared light sensor (11)
placed on the other side of the disk (8) such that the sensor (11)
produces a high binary state of voltage when any of the plurality
slots of the rotating disk (8) reaches under operating zone of the
infrared high source (10) and the sensor (11) thereby indicating the
speed of the drum (8); and a controller (16) receiving the feed
back pulses from the sensor (11) and setting a desired speed of the
d. c. motor, the controller (16) regulating the desired motor speed
vis-a-vis flyer's speed by monitoring and controlling a firing angle of
the set of rectifiers (4) via a firing circuit (17).

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2. The system as claimed in claim 1, wherein the values of high binary state
of voltage produced by the sensor (11) representing the speed of the
drum (8) is corrected and scaled-up by using a phase locked loop circuit
(12).
3. The system as claimed in claim 1 or 2, wherein the output from the phase
locked loop circuit (12) is displayed in a display means (15) via a latch and
hold circuit (14).
4. The system as claimed in one of the preceding claims wherein the
controller (16) is operable in a manual mode (MM) and / or in an auto-
mode (AM) by adapting a change-over switch.
5. The system as claimed in claim 1, wherein the slotted disk (9) comprising
a plurality of slots for example, seventy numbers, preferably sixty
numbers, more preferably fifty numbers.
6. The system as claimed in claim 1 or 5, wherein the size of the plurality
slots of the disk (9) comprises a width (W) between 8 to 12 mm and a
diameter (d) between 25 to 35 mm, and wherein a plurality of fixing
screws (18) are used to fix the disk (9) with the drum (8) of the spinning
machine (6).
7. A closed-loop measurement system having a control device for regulating
flyer's speed of a spinning machine as substantially described herein with
reference to the accompanying drawings.


The invention relates to a closed-loop measurement system having a control
device for regulating flyer's speed of a spinning machine, the system

comprising
a three - phase A. c. supply source (1) for feeding a shunt - field circuit (3)

of a
d. c. motor via a rectifier circuit (2), the supply source (1) further feeding

a set
of silicon controlled rectifiers which is fed to an armature (5) of the d. c.

motor
which drives a spinning machine (6), the spinning machine (6) having a

rotatable
drum (8) with a main shaft (7); and a slotted disk (9) rigidly fixed on the

drum
(8), and being rotatable in registration with the rotating speed of the drum

(8);
atleast one infrared light source (10) provided on a first side of the disk

(8); an
infrared light sensor (11) placed on a second side of the disk (8) such that

the
sensor (11) produces a high binary state of voltage when any of the plurality
slots of the rotating drum (8) reaches beneath the operating zone of the

infrared
light source (10) and the sensor (11) indicating the speed of the drum (8);
characterized by comprising a controller (16) receiving the feed back pulses

from
the sensor (11) and setting a desired speed of the d. c. motor, the controller
(16) regulating the desired motor speed including the flyer's speed by

monitoring
and controlling a firing angle of the set of rectifiers (4) via a firing

circuit (17).

Documents:

00621-kol-2006-abstract.pdf

00621-kol-2006-claims.pdf

00621-kol-2006-correspondence other.pdf

00621-kol-2006-description (complete).pdf

00621-kol-2006-drawings.pdf

00621-kol-2006-form-1.pdf

00621-kol-2006-form-2.pdf

00621-kol-2006-form-3.pdf

621-KOL-2006-ABSTRACT 1.1.pdf

621-kol-2006-abstract.pdf

621-kol-2006-amanded claims.pdf

621-kol-2006-amanded pages of specification.pdf

621-kol-2006-cancelled pages 1.1.pdf

621-KOL-2006-CANCELLED PAGES.pdf

621-KOL-2006-CLAIMS.pdf

621-kol-2006-correspondence 1.1.pdf

621-KOL-2006-CORRESPONDENCE.1.3.pdf

621-KOL-2006-CORRESPONDENCE.pdf

621-KOL-2006-DESCRIPTION (COMPLETE) 1.1.pdf

621-kol-2006-description (complete).pdf

621-KOL-2006-DRAWINGS 1.1.pdf

621-kol-2006-drawings.pdf

621-KOL-2006-EXAMINATION REPORT.1.3.pdf

621-KOL-2006-FORM 1.1.1.pdf

621-kol-2006-form 1.pdf

621-KOL-2006-FORM 18.1.3.pdf

621-KOL-2006-FORM 2.1.1.pdf

621-kol-2006-form 2.pdf

621-KOL-2006-FORM 26.1.3.pdf

621-KOL-2006-FORM 3.1.3.pdf

621-KOL-2006-FORM 5.1.3.pdf

621-KOL-2006-FORM 5.pdf

621-KOL-2006-FORM-27.pdf

621-KOL-2006-GRANTED-ABSTRACT.pdf

621-KOL-2006-GRANTED-CLAIMS.pdf

621-KOL-2006-GRANTED-DESCRIPTION (COMPLETE).pdf

621-KOL-2006-GRANTED-DRAWINGS.pdf

621-KOL-2006-GRANTED-FORM 1.pdf

621-KOL-2006-GRANTED-FORM 2.pdf

621-KOL-2006-GRANTED-LETTER PATENT.pdf

621-KOL-2006-GRANTED-SPECIFICATION.pdf

621-KOL-2006-PA.pdf

621-KOL-2006-REPLY TO EXAMINATION REPORT.1.3.pdf

abstract-00621-kol-2006.jpg


Patent Number 247513
Indian Patent Application Number 621/KOL/2006
PG Journal Number 16/2011
Publication Date 22-Apr-2011
Grant Date 13-Apr-2011
Date of Filing 23-Jun-2006
Name of Patentee NATIONAL INSTITUTE OF RESEARCH ON JUTE & ALLIED FIBRE TECHNOLOGY
Applicant Address INDIAN COUNCIL & AGRICULTURAL RESEARCH, DARE, MINISTRY OF AGRICLULTURE, GOVERNMENT OF INDIA 12, REGENT PARK, KOLKATA 700 040
Inventors:
# Inventor's Name Inventor's Address
1 DR. GAUTAM ROY NATIONAL INSTITUTE RESEARCH ON JUTE AND ALLIED FIBRE TECHNOLOGY INDIAN COUNCIL & AGRICULTURAL RESEARCH, DARE, MINISTRY OF AGRICLULTURE, GOVERNMENT OF INDIA 12, REGENT PARK, KOLKATA 700 040
2 DR. SUJIT KR. BHATTACHARYA NATIONAL INSTITUTE OF RESEARCH ON JUTE & APPLIED FIBRE TECHNOLOGY, INDIAN COUNCIL & AGRICULTURAL RESEARCH, DARE, MINISTRY OF AGRICLULTURE, GOVERNMENT OF INDIA 12, REGENT PARK, KOLKATA 700 040
3 SRI GOBINDO KRIPA BHATTACHARYA NATIONAL INSTITUTE RESEARCH ON JUTE AND ALLIED FIBRE TECHNOLOGY INDIAN COUNCIL & AGRICULTURAL RESEARCH, DARE, MINISTRY OF AGRICLULTURE, GOVERNMENT OF INDIA 12, REGENT PARK, KOLKATA 700 040
PCT International Classification Number B65H67/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA