Title of Invention	SET UP IN A DRAFTING DEVICE FOR CARD SLIVER FOR EXAMPLE OF A DRAWING FRAME FOR DETERMINATION OF ADJUSTMENT VALUES FOR THE PREDRAFT
Abstract	A device is provided for determining and optimizing a pre-draft value of a draw unit for slivers. The draw unit has a feed roll pair, a center roll pair and a delivery roll pair roll pair, a pre-draft zone between the feed roll pair and the center roll pair, and a main draft zone between the center roll pair and the delivery roll pair. The device has a center roll drive motor for driving a lower roll of the center roll pair, a sensor for measuring values of a variable indicative of draft forces at the center roll drive motor, and means for controlling the drive motor in accordance with a function defining a relationship between the measured value and the pre-draft value. The function indicates an optimum region having at least one of an increase end point and an increase end region, the optimum region providing a parameter that is usable for optimizing the pre-draft value for the draw unit. A speed of the center roll drive motor is controlled to adjust a ratio of circumferential speeds of the center roll pair to the feed roll pair in order to change the pre-draft value.

Title of Invention

SET UP IN A DRAFTING DEVICE FOR CARD SLIVER FOR EXAMPLE OF A DRAWING FRAME FOR DETERMINATION OF ADJUSTMENT VALUES FOR THE PREDRAFT

Abstract

A device is provided for determining and optimizing a pre-draft value of a draw unit for slivers. The draw unit has a feed roll pair, a center roll pair and a delivery roll pair roll pair, a pre-draft zone between the feed roll pair and the center roll pair, and a main draft zone between the center roll pair and the delivery roll pair. The device has a center roll drive motor for driving a lower roll of the center roll pair, a sensor for measuring values of a variable indicative of draft forces at the center roll drive motor, and means for controlling the drive motor in accordance with a function defining a relationship between the measured value and the pre-draft value. The function indicates an optimum region having at least one of an increase end point and an increase end region, the optimum region providing a parameter that is usable for optimizing the pre-draft value for the draw unit. A speed of the center roll drive motor is controlled to adjust a ratio of circumferential speeds of the center roll pair to the feed roll pair in order to change the pre-draft value.

Full Text	Sat up in a drafting device for Card Sliver for example of a drawing frame for determination of adjustment values for the predraft. The invention refers to a sat up at a drafting device for card sliver, for example of a drawing frame for determination of adjustment values for the predraft, wherein the ratio of circumferential speed of middle to feed bottom roll of drafting device is changeable, in order to change the draft and in which measurement values of a variable characterizing the draft force in main- and/or pre draft field are admissible. In a known device it is provided that in a pre draft field a pressure bar is present for the daflection of fibre structure to which a measuring item is allocated, with which a signal depending on the contact pressure of the fibre structure on the pressure bar is generated. From the contact pressure the draft force is derived. The assignment lies at the base of the invention to procure a drafting device of the type described at the 8ntry which improves yet further particularly the matching of drafting device in each range change and/or in quality change of produced fibre object. The solution of this assignment takes place, through the characteristic features of claim 1 . Through the measures as per invention, it gets to improve the matching (adjustment) of the drafting device yet essentially. Out of the electric signals, in simple way undesirable deviations of desired variables for example machine related and/or fibre technological values in each range change and/or in quality changes of produced fibre object is identified. Therein the type and size of deviation is determined. Advantageously undesired deviations in operation can be identified and operating persons can serve for matching of drafting device for example change of clamping line distances and/or of drafts. The invention allous also a computerwise evaluation and a corresponding matching of drafting device on ground of evaluation results either through operating persons self operatingly (automatic) through the Computer in combination uith the regulating drafting device. The claims 2 to 2b have advantageous further developments in content. The invention is closer explained follouingly uith the help of diagramatically represented execution examples, It shows : Figure 1. Schematically in side view a regulating drawing frame uith the device as per invention. Figure 2 Current input at the middle roll depending on pre draft rolls (pre draft level). Figure 3 a function betuean the draft force and the pre draft values (pre draft level) uith a slope end area. Figure 4 a function between the draft force and the pre draft values (pre draft level) and a slope end point. Figure 5 a function between the pre draft force and the pre draft distances with a slope area and; Figure 6 a function between the draft force and the main draft distances with a slope end point. As per figure 1 a drawing frame 1 for example Truetzschler - drauing frame HSR shous a drafting device 2 to which a drafting device entry 3 in prelaid and a drafting device exit 4 is post laid. The card slivers 5 come out of cans (not represented), coming in the tape guide 6 and drawn through the draw boxes 7,8 are transported past the measuring element 9. The drafting device 2 is conceived as 4-over-3-drafting device that means it comprise of three bottom rolls I, II, III (I withdrawal bottom roll, II-middle bottom roll, Ill- feed bottom roll) and four top rolls, 11, 12, 13, 14. in drafting device 2 the draft of fibre structure 51V/ takes place out of multiple number of card slivers 5. The draft is composed of pre draft and main draft. The roll pairs 14III and 13/II form the pre draft field and the roll pairs 13/II and 11, 12/II form the main draft field. In pre draft field the fibre structure 5'and in main draft field the fibre structure 5" is stretched. The stretched card slivers 5' reach in drafting device out let 4, a non woven guide 10 and are drawn by means of draw boxes 15, 16 through a sliver funnel 17 in which they are bunched together to a card sliver 18 which is deposited followingly in can. With A the working direction is denoted. The draw boxes 7,8 and the feed bottom rolls III which are for example mechanically coupled over tooth type belt,are driven by the variable speed motor 19 wherein a set value is to be specified.(Theassociated top roll 14 runs along). The middle-bottom roll II is driven by the variable speed middle motor 32 (The associated top roll 13 runs along). The exit-bottom roll I and the draw boxes 15, 16 are driven by the main motor 20. The variable speed motor 19, the drive motor 32 and the main motor 20 have each at their disposal over an internal automatic controller 21, 33 or rather 22. The automatic controller 21 , 33 and 22 remain each in link with the electrical terminals of motors 19, 32 or rather 22. The automatic control (speed control) takes place in each case over a closed loop control circuit wherein a tachometer generator 23 is allocated to automatic speed control motor 19, a tacometer generator 34 and a tachometer generator 24 are allocated to middle motor 32 and the main motor 20 respectively. At the drafting device entry 3 a variable proportional to the measurements as for example the cross section of fed-in card-sliver 5 is measured by an inlet measuring element 9, uhich is knoun as for example from the DE-A-4404326. At the drafting device outlet 4, the cross section (thickness) of the emerged card sliver 13 is obtained by an outlet measuring item 25 allocated to the sliver funnel 17, uhich is knoun as for example out of the DE-A-19537983. A central computer unit 25 (control-and regulating equipment) as for example micro computer uith micro processor, communicates an adjustment of reference variable for the variable spead control motor 19 to the automatic controller 21 . The measured quantities of both the measuring elements 9 or rather 25 are communicated during draft process to the central computer unit 25. From the measured quantities of entry measuring element 9 and from the reference values for the cross section of emerging card sliver 18 the reference value for the variable speed control motor 19 is determined in the central computer unit 26. The measured quantities of outlet measuring items 25 serve the monitoring of emerging card sliver 18 (output sliver monitoring). There takes place an online-communication of optimum pre draft. Uith the help of this control system, fluctuations in the cross section of fed-in card sliver 5 can be compensated through corresponding control of draft process or rather a homogenization of card sliver can be reached. Uith 27 a display screen, with 28 an interface, uith 29 an input equipment and uith 30 a pressure rod are denoted. A measuring element 35 for the current input of middle motor is present which is the useful component of drive module of activating unit 33. The measuring element 35 remains in link with the electrical terminal of middle motor 32. The measured values from the measuring item 35 are supplied over the automatic controller 33 to a memory 31 in computer 26. The device as per invention makes possible the direct communication of adjustment values for the pre draft. Uith the help of fibre structure 5 a multiple number of measured values of current input are admitted over the measuring item 35, out of which in the control and regulating equipment 26 as for example micro computer, the function between the measured values of current input (that means one of the variables characterizing the draft force) and the pre draft values as per figure 2 are found out, which is drawnup for adjustment of an optimum pre draft. Uith the device as per invention at the drawing frame the optimum pre draft level is determined and adjusted. Through it, that on line at the drawing frame the optimum pre draft level can be determined, the crimp of drafting sliver for the drafting process can be realistically described. These measures form an important step to a self optimising drawing frame. The assignment of the pre draft exists therein, to pull the crimp out of the fibres. There exists a pre draft point, in which the crimp is pulled straight out of the fibres. Below and above this optimum draft level the quality is worse. Therefore this optimum pre draft level at drawing sliver can be described through a measured quantity. In case the crimped fibres enter from the pre draft to the main draft field of the drawing frame then it gives for the draft force in main draft an other level than when fibres stretched fully to the pre draft enter in the main draft area. This draft force change covers so that the optimum draft level can be determined. The optimum pre draft level corresponds to just fully stretched fibres in pre draft. In Fig.3 schematically a function between the pre draft force and the pre draft values (pre draft level) with a slope end area is represented. The slope end area which shows a turn back point represents the optimum pre draft level. The draft force directly or indirectly can be determined over a variable characterising the draft force for example the current input at middle motor. In Figure 4 a function between the draft force and the pre draft values with a slope end area is represented, which gives optimum pre draft level. The slope end point is a prominent point, at which the slope does not increase any more or is reduced significantly. The slope end point can be found out through it that the measured values of the curve is reflected through two approximated (neared) straight lines computerwise and/or figure wise and the point of inter section of both the straight lines is drawn up for adjustment of optimum predraft. The device as per invention can be drawn also for adjustment of an optimum pre draft distance and main draft distance (clamp line distance). Figure 5 shows schematically a function between the draft force and the pre draft distances with a slope end area. Figure 6 shows schematically a function between the draft force and the main draft distances with a slope end point. The invention is represented at the example of a drafting device of a drawing frame. All drafting devices however at spinning machines, as for example ring spinning machine, combing machine, card and the equivalent are covered. The invention is applicable in a controlled or uncontrolled drafting device. WE CLAIM 1. A device for determining and optimizing a pre-draft value on a draw unit for slivers, the draw unit having a feed roll pair, a center roll pair and a delivery roll pair, a pre-draft zone between the feed roil pair and the center roil pair, and a main draft zone between the center roll pair and the delivery roll pair, the device comprising-. - a center roll drive motor for driving a lower roll of the center roll pair; - a sensor for measuring values of a variable indicative of draft forces at the center roll drive motor; and - means for controlling the drive motor in accordance with a function defining a relationship between the measured valued and the pre-draft value, the function indicating an optimum region having at least one of an increase end point and an increase end region, the optimum region providing a parameter that is usable for optimizing the pre-draft value for the draw unit. a speed of the center roll drive motor is controlled to adjust a ratio of circumferential speeds of the center roll pair to the feed roll pair in order to change the pre-draft value. 2. Device as claimed in claim 1, marked through it, that the drive force for the middle roll (II) of the drafting device is measurable. 3. Device as claimed in claim lor 2, marked through it, that the drive force is measurable through measurement of torque at the middle roll (II). 4. Device as claimed in one of the claims 1 to 3, marked through it, that the drive force through measurement of effective power of current input is measurable. 5. Device as claimed in one of the claims 1 to 4, marked through it, that the drive force is measurable through measurement of phase shifting. 6. Device as claimed in one of the claims 1 to 5, marked through it, that the drive force is measurable through measurement of speed change of middle roll (II). 7. Device as claimed in one of the claims 1 to 6, marked through it, that the drive of roll pair (III/14,11/13,I/11,12) of drafting device (2) separate drive motors (19,20,32) are provided. 8. Device as claimed in one of the claims 1 to 7, marked through it, that the middle bottom roll (II) may be driven through a separate controllable drive motor (31). 9. Device as claimed in one of the claims 1 to 8, marked through it, that the draft force rises - up to slope end point or rather area. 10.Device as claimed in one of the claims 1 to 9, marked through it, that the draft force rises steep up to slope end point or rather area. 11. Device as claimed in one of the claims 1 to 10, marked through it, that the draft force rises flat after the slope end point or rather area. 12. Device as claimed in one of the claims 1 to 11, marked through it, that the draft force drops after the slope end point or rather area (reversion). 13. Device as claimed in one of the claims 1 to 12, marked through it, that the slope end point or rather the area forms a maximum. 14. Device as claimed in one of the claims 1 to 13, marked through it, that the measurement values are reflected through two approximate (neared) straight lines. 15.Device as claimed in one of the claims 1 to 14, marked through it, that the point of inter section of straight lines, the slope end point or the slope end area is drawn in for adjustment of optimum pre draft (W). 16.Device as claimed in one of the claims 1 to 15, marked through it, that the measured values for the draft force variable are converted to electronic signals. 17.Device as claimed in one of the claims 1 to 16, marked through that the measured values for the draft force variables are determined on line. 18. Device as claimed in one of the claims 1 to 17, marked through it, that the measured values for the draft force variables are allocated to definite pre drafts (W). 19.Device as claimed in one of the claims 1 to 18, marked through it, that the allocation of measured values for the draft force variables to definite pre drafts (W) takes place computer wise as for example through a computer (26). 20.Device as claimed in one of the claims 1 to 19, marked through it, that the allocation of measured values to definite pre drafts (W) is represented tabularly. 21. Device as claimed in one of the claims 1 to 20, marked through it, that the allocation of measured values to definite pre drafts (W) is representable graphically. 22. Device as claimed in one of the claims 1 to 21, marked through it, that the point of inter section of both the straight lines represents the pre draft (W), in which the crimp of fibre materials (5') is just pulled out or rather stretched. 23.Device as claimed in one of the claims 1 to 22, marked through it, that both the straight Ikies automatically can be approximated, as for example through a computer (26). 24.Device as claimed in one of the claims 1 to 23, marked through it, that the determination of point of inter section of both the straight Tries automatically takes place for example through a computer (26). 25.Device as claimed in one of the claims 1 to 24, marked through it, that the optimum pre draft (W) lies around a constant factor near the point of inter section of both the straight lines. 26.Device as claimed in one of the claims 1 to 25, marked through it, that the determination of optimum pre draft (W) takes place automatically. 27. Device as claimed in one of the claims 1 to 26, marked through it, that the adjustment of optimum pre draft (W) takes place automatically. 28.Device as claimed in one of the claims 1 to 27, marked through it, that the measuring equipment (35) for the draft force variable to connected as par example to an electronic control and regulating equipment (26) for example micro computer. 29.Device as claimed in one of the claims 1 to 28, marked through it, that setting equipment for the pre draft (W) is connected to the electronic control and regulating equipment (26). 30.Device particularly as claimed in one of the claims 1 to 29, marked through it, that the optimum adjustment of drafting device (23) for example of main daft distance (clamp line distance) of the main draft level of the pre draft distance (clamp line distance) and/or of pre draft level is provided. 31. Device in particular as claimed in one of the claims 1 to 30, marked through it, that through determination of a variable characterizing draft force as function of pre draft distance and main draft distance the optimum adjustment of pre draft and main draft distance takes place. 32. Device as claimed in one of the claims 1 to 31, marked through it, that the drive motor (32) is lined electrically with a measuring equipment (35) for the measurement of current input. 33. Device as claimed in one of the claims 1 to 32, marked through it, that the measuring equipment (35) is combined with the electronic control-and regulating equipment (26) for example micro computer. 34.Device as claimed in one of the claims 1 to 33, marked through it, that between measuring equipment (35) and the computer (26) an intensifier is present. 35.Device as claimed in one of the claims 1 to 34, marked through it, that the variable characterizing the draft forces is measurable at a withdrawal roll (II) of pre draft field. 36.Device as claimed in one of the claims 1 to 35, marked through it, that the variable characterizing the draft forces is measurable at a feed roll (II) of main draft field. A device is provided for determining and optimizing a pre-draft value of a draw unit for slivers. The draw unit has a feed roll pair, a center roll pair and a delivery roll pair roll pair, a pre-draft zone between the feed roll pair and the center roll pair, and a main draft zone between the center roll pair and the delivery roll pair. The device has a center roll drive motor for driving a lower roll of the center roll pair, a sensor for measuring values of a variable indicative of draft forces at the center roll drive motor, and means for controlling the drive motor in accordance with a function defining a relationship between the measured value and the pre-draft value. The function indicates an optimum region having at least one of an increase end point and an increase end region, the optimum region providing a parameter that is usable for optimizing the pre-draft value for the draw unit. A speed of the center roll drive motor is controlled to adjust a ratio of circumferential speeds of the center roll pair to the feed roll pair in order to change the pre-draft value.

Full Text

Sat up in a drafting device for Card Sliver for example
of a drawing frame for determination of adjustment values
for the predraft.
The invention refers to a sat up at a drafting device for
card sliver, for example of a drawing frame for
determination of adjustment values for the predraft,
wherein the ratio of circumferential speed of middle to
feed bottom roll of drafting device is changeable, in
order to change the draft and in which measurement values
of a variable characterizing the draft force in main-
and/or pre draft field are admissible.
In a known device it is provided that in a pre draft
field a pressure bar is present for the daflection of
fibre structure to which a measuring item is allocated,
with which a signal depending on the contact pressure of
the fibre structure on the pressure bar is generated.
From the contact pressure the draft force is derived.
The assignment lies at the base of the invention to
procure a drafting device of the type described at the
8ntry which improves yet further particularly the
matching of drafting device in each range change and/or
in quality change of produced fibre object.
The solution of this assignment takes place, through the
characteristic features of claim 1 .
Through the measures as per invention, it gets to improve
the matching (adjustment) of the drafting device yet
essentially. Out of the electric signals, in simple way
undesirable deviations of desired variables for example
machine related and/or fibre technological values in each
range change and/or in quality changes of produced fibre
object is identified. Therein the type and size of
deviation is determined. Advantageously undesired
deviations in operation can be identified and operating
persons can serve for matching of drafting device for
example change of clamping line distances and/or of
drafts. The invention allous also a computerwise
evaluation and a corresponding matching of drafting
device on ground of evaluation results either through
operating persons self operatingly (automatic) through
the Computer in combination uith the regulating drafting
device.
The claims 2 to 2b have advantageous further developments
in content.
The invention is closer explained follouingly uith the
help of diagramatically represented execution
examples,
It shows :
Figure 1. Schematically in side view a regulating
drawing frame uith the device as per
invention.
Figure 2 Current input at the middle roll depending on
pre draft rolls (pre draft level).
Figure 3 a function betuean the draft force and the pre
draft values (pre draft level) uith a slope
end area.
Figure 4 a function between the draft force and the pre
draft values (pre draft level) and a slope end
point.
Figure 5 a function between the pre draft force and the
pre draft distances with a slope area and;
Figure 6 a function between the draft force and the
main draft distances with a slope end point.
As per figure 1 a drawing frame 1 for example
Truetzschler - drauing frame HSR shous a drafting device
2 to which a drafting device entry 3 in prelaid and a
drafting device exit 4 is post laid. The card slivers 5
come out of cans (not represented), coming in the tape
guide 6 and drawn through the draw boxes 7,8 are
transported past the measuring element 9. The drafting
device 2 is conceived as 4-over-3-drafting device that
means it comprise of three bottom rolls I, II, III (I
withdrawal bottom roll, II-middle bottom roll, Ill-
feed bottom roll) and four top rolls, 11, 12, 13, 14.
in drafting device 2 the draft of fibre structure 51V/
takes place out of multiple number of card slivers 5.
The draft is composed of pre draft and main draft. The
roll pairs 14III and 13/II form the pre draft field and
the roll pairs 13/II and 11, 12/II form the main draft
field. In pre draft field the fibre structure 5'and in
main draft field the fibre structure 5" is stretched.
The stretched card slivers 5' reach in drafting device
out let 4, a non woven guide 10 and are drawn by means
of draw boxes 15, 16 through a sliver funnel 17 in
which they are bunched together to a card sliver 18 which
is deposited followingly in can. With A the working
direction is denoted.
The draw boxes 7,8 and the feed bottom rolls III which
are for example mechanically coupled over tooth type
belt,are driven by the variable speed motor 19 wherein a
set value is to be specified.(Theassociated top roll 14
runs along). The middle-bottom roll II is driven by the
variable speed middle motor 32 (The associated top roll
13 runs along). The exit-bottom roll I and the draw boxes
15, 16 are driven by the main motor 20. The variable
speed motor 19, the drive motor 32 and the main motor 20
have each at their disposal over an internal automatic
controller 21, 33 or rather 22. The automatic controller
21 , 33 and 22 remain each in link with the electrical
terminals of motors 19, 32 or rather 22. The automatic
control (speed control) takes place in each case over a
closed loop control circuit wherein a tachometer
generator 23 is allocated to automatic speed control
motor 19, a tacometer generator 34 and a tachometer
generator 24 are allocated to middle motor 32 and the
main motor 20 respectively. At the drafting device entry
3 a variable proportional to the measurements as for
example the cross section of fed-in card-sliver 5 is
measured by an inlet measuring element 9, uhich is knoun
as for example from the DE-A-4404326. At the drafting
device outlet 4, the cross section (thickness) of the
emerged card sliver 13 is obtained by an outlet
measuring item 25 allocated to the sliver funnel 17,
uhich is knoun as for example out of the DE-A-19537983.
A central computer unit 25 (control-and regulating
equipment) as for example micro computer uith micro
processor, communicates an adjustment of reference
variable for the variable spead control motor 19 to the
automatic controller 21 . The measured quantities of both
the measuring elements 9 or rather 25 are communicated
during draft process to the central computer unit 25.
From the measured quantities of entry measuring element
9 and from the reference values for the cross section of
emerging card sliver 18 the reference value for the
variable speed control motor 19 is determined in the
central computer unit 26. The measured quantities of
outlet measuring items 25 serve the monitoring of
emerging card sliver 18 (output sliver monitoring).
There takes place an online-communication of optimum pre
draft. Uith the help of this control system,
fluctuations in the cross section of fed-in card sliver
5 can be compensated through corresponding control of
draft process or rather a homogenization of card sliver
can be reached. Uith 27 a display screen, with 28 an
interface, uith 29 an input equipment and uith 30 a
pressure rod are denoted.
A measuring element 35 for the current input of middle
motor is present which is the useful component of drive
module of activating unit 33. The measuring element 35
remains in link with the electrical terminal of middle
motor 32. The measured values from the measuring item
35 are supplied over the automatic controller 33 to a
memory 31 in computer 26. The device as per invention
makes possible the direct communication of adjustment
values for the pre draft. Uith the help of fibre
structure 5 a multiple number of measured values of
current input are admitted over the measuring item 35,
out of which in the control and regulating equipment 26
as for example micro computer, the function between the
measured values of current input (that means one of the
variables characterizing the draft force) and the pre
draft values as per figure 2 are found out, which is
drawnup for adjustment of an optimum pre draft.
Uith the device as per invention at the drawing frame
the optimum pre draft level is determined and adjusted.
Through it, that on line at the drawing frame the
optimum pre draft level can be determined, the crimp of
drafting sliver for the drafting process can be
realistically described. These measures form an
important step to a self optimising drawing frame. The
assignment of the pre draft exists therein, to pull the
crimp out of the fibres. There exists a pre draft point,
in which the crimp is pulled straight out of the
fibres. Below and above this optimum draft level the
quality is worse. Therefore this optimum pre draft level
at drawing sliver can be described through a measured
quantity.
In case the crimped fibres enter from the pre draft to
the main draft field of the drawing frame then it gives
for the draft force in main draft an other level than
when fibres stretched fully to the pre draft enter in
the main draft area. This draft force change covers so
that the optimum draft level can be determined. The
optimum pre draft level corresponds to just fully
stretched fibres in pre draft.
In Fig.3 schematically a function between the pre draft
force and the pre draft values (pre draft level) with a
slope end area is represented. The slope end area which
shows a turn back point represents the optimum pre draft
level.
The draft force directly or indirectly can be determined
over a variable characterising the draft force for
example the current input at middle motor.
In Figure 4 a function between the draft force and the
pre draft values with a slope end area is represented,
which gives optimum pre draft level. The slope end point
is a prominent point, at which the slope does not
increase any more or is reduced significantly. The slope
end point can be found out through it that the measured
values of the curve is reflected through two
approximated (neared) straight lines computerwise and/or
figure wise and the point of inter section of both the
straight lines is drawn up for adjustment of optimum
predraft.
The device as per invention can be drawn also for
adjustment of an optimum pre draft distance and main
draft distance (clamp line distance). Figure 5 shows
schematically a function between the draft force and the
pre draft distances with a slope end area. Figure 6
shows schematically a function between the draft force
and the main draft distances with a slope end point.
The invention is represented at the example of a
drafting device of a drawing frame. All drafting devices
however at spinning machines, as for example ring
spinning machine, combing machine, card and the
equivalent are covered.
The invention is applicable in a controlled or
uncontrolled drafting device.
WE CLAIM
1. A device for determining and optimizing a pre-draft value on a draw unit for
slivers, the draw unit having a feed roll pair, a center roll pair and a delivery
roll pair, a pre-draft zone between the feed roil pair and the center roil pair,
and a main draft zone between the center roll pair and the delivery roll pair,
the device comprising-.
- a center roll drive motor for driving a lower roll of the center roll pair;
- a sensor for measuring values of a variable indicative of draft forces at the
center roll drive motor; and
- means for controlling the drive motor in accordance with a function defining a
relationship between the measured valued and the pre-draft value, the
function indicating an optimum region having at least one of an increase end
point and an increase end region, the optimum region providing a parameter
that is usable for optimizing the pre-draft value for the draw unit.
a speed of the center roll drive motor is controlled to adjust a ratio
of circumferential speeds of the center roll pair to the feed roll pair in order to
change the pre-draft value.
2. Device as claimed in claim 1, marked through it, that the drive force for the
middle roll (II) of the drafting device is measurable.
3. Device as claimed in claim lor 2, marked through it, that the drive force is
measurable through measurement of torque at the middle roll (II).
4. Device as claimed in one of the claims 1 to 3, marked through it, that the
drive force through measurement of effective power of current input is
measurable.
5. Device as claimed in one of the claims 1 to 4, marked through it, that the
drive force is measurable through measurement of phase shifting.
6. Device as claimed in one of the claims 1 to 5, marked through it, that the
drive force is measurable through measurement of speed change of middle
roll (II).
7. Device as claimed in one of the claims 1 to 6, marked through it, that the
drive of roll pair (III/14,11/13,I/11,12) of drafting device (2) separate drive
motors (19,20,32) are provided.
8. Device as claimed in one of the claims 1 to 7, marked through it, that the
middle bottom roll (II) may be driven through a separate controllable drive
motor (31).
9. Device as claimed in one of the claims 1 to 8, marked through it, that the
draft force rises - up to slope end point or rather area.
10.Device as claimed in one of the claims 1 to 9, marked through it, that the
draft force rises steep up to slope end point or rather area.
11. Device as claimed in one of the claims 1 to 10, marked through it, that the
draft force rises flat after the slope end point or rather area.
12. Device as claimed in one of the claims 1 to 11, marked through it, that the
draft force drops after the slope end point or rather area (reversion).
13. Device as claimed in one of the claims 1 to 12, marked through it, that the
slope end point or rather the area forms a maximum.
14. Device as claimed in one of the claims 1 to 13, marked through it, that the
measurement values are reflected through two approximate (neared) straight
lines.
15.Device as claimed in one of the claims 1 to 14, marked through it, that the
point of inter section of straight lines, the slope end point or the slope end
area is drawn in for adjustment of optimum pre draft (W).
16.Device as claimed in one of the claims 1 to 15, marked through it, that the
measured values for the draft force variable are converted to electronic
signals.
17.Device as claimed in one of the claims 1 to 16, marked through that the
measured values for the draft force variables are determined on line.
18. Device as claimed in one of the claims 1 to 17, marked through it, that the
measured values for the draft force variables are allocated to definite pre
drafts (W).
19.Device as claimed in one of the claims 1 to 18, marked through it, that the
allocation of measured values for the draft force variables to definite pre
drafts (W) takes place computer wise as for example through a computer
(26).
20.Device as claimed in one of the claims 1 to 19, marked through it, that the
allocation of measured values to definite pre drafts (W) is represented
tabularly.
21. Device as claimed in one of the claims 1 to 20, marked through it, that the
allocation of measured values to definite pre drafts (W) is representable
graphically.
22. Device as claimed in one of the claims 1 to 21, marked through it, that the
point of inter section of both the straight lines represents the pre draft (W),
in which the crimp of fibre materials (5') is just pulled out or rather stretched.
23.Device as claimed in one of the claims 1 to 22, marked through it, that both
the straight Ikies automatically can be approximated, as for example through
a computer (26).
24.Device as claimed in one of the claims 1 to 23, marked through it, that the
determination of point of inter section of both the straight Tries automatically
takes place for example through a computer (26).
25.Device as claimed in one of the claims 1 to 24, marked through it, that the
optimum pre draft (W) lies around a constant factor near the point of inter
section of both the straight lines.
26.Device as claimed in one of the claims 1 to 25, marked through it, that the
determination of optimum pre draft (W) takes place automatically.
27. Device as claimed in one of the claims 1 to 26, marked through it, that the
adjustment of optimum pre draft (W) takes place automatically.
28.Device as claimed in one of the claims 1 to 27, marked through it, that the
measuring equipment (35) for the draft force variable to connected as par
example to an electronic control and regulating equipment (26) for example
micro computer.
29.Device as claimed in one of the claims 1 to 28, marked through it, that
setting equipment for the pre draft (W) is connected to the electronic control
and regulating equipment (26).
30.Device particularly as claimed in one of the claims 1 to 29, marked through it,
that the optimum adjustment of drafting device (23) for example of main daft
distance (clamp line distance) of the main draft level of the pre draft distance
(clamp line distance) and/or of pre draft level is provided.
31. Device in particular as claimed in one of the claims 1 to 30, marked through
it, that through determination of a variable characterizing draft force as
function of pre draft distance and main draft distance the optimum
adjustment of pre draft and main draft distance takes place.
32. Device as claimed in one of the claims 1 to 31, marked through it, that the
drive motor (32) is lined electrically with a measuring equipment (35) for the
measurement of current input.
33. Device as claimed in one of the claims 1 to 32, marked through it, that the
measuring equipment (35) is combined with the electronic control-and
regulating equipment (26) for example micro computer.
34.Device as claimed in one of the claims 1 to 33, marked through it, that
between measuring equipment (35) and the computer (26) an intensifier is
present.
35.Device as claimed in one of the claims 1 to 34, marked through it, that the
variable characterizing the draft forces is measurable at a withdrawal roll (II)
of pre draft field.
36.Device as claimed in one of the claims 1 to 35, marked through it, that the
variable characterizing the draft forces is measurable at a feed roll (II) of
main draft field.

A device is provided for determining and optimizing a pre-draft value of a draw
unit for slivers. The draw unit has a feed roll pair, a center roll pair and a
delivery roll pair roll pair, a pre-draft zone between the feed roll pair and the
center roll pair, and a main draft zone between the center roll pair and the
delivery roll pair. The device has a center roll drive motor for driving a lower roll
of the center roll pair, a sensor for measuring values of a variable indicative of
draft forces at the center roll drive motor, and means for controlling the drive
motor in accordance with a function defining a relationship between the
measured value and the pre-draft value. The function indicates an optimum
region having at least one of an increase end point and an increase end region,
the optimum region providing a parameter that is usable for optimizing the pre-draft
value for the draw unit. A speed of the center roll drive motor is controlled
to adjust a ratio of circumferential speeds of the center roll pair to the feed roll
pair in order to change the pre-draft value.

Documents:

518-CAL-2002-FORM 27.pdf

518-cal-2002-granted-abstract.pdf

518-cal-2002-granted-claims.pdf

518-cal-2002-granted-correspondence.pdf

518-cal-2002-granted-description (complete).pdf

518-cal-2002-granted-drawings.pdf

518-cal-2002-granted-examination report.pdf

518-cal-2002-granted-form 1.pdf

518-cal-2002-granted-form 18.pdf

518-cal-2002-granted-form 2.pdf

518-cal-2002-granted-form 26.pdf

518-cal-2002-granted-form 3.pdf

518-cal-2002-granted-form 5.pdf

518-cal-2002-granted-priority document.pdf

518-cal-2002-granted-reply to examination report.pdf

518-cal-2002-granted-specification.pdf

518-cal-2002-granted-translated copy of priority document.pdf

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Patent Number

233000

Indian Patent Application Number

518/CAL/2002

PG Journal Number

13/2009

Publication Date

27-Mar-2009

Grant Date

25-Mar-2009

Date of Filing

04-Sep-2002

Name of Patentee

TRUTZSCHLER GMBH & CO. KG.

Applicant Address

DUVENSTR. 82-92, D-41199 MONCHENGLADBACH

Inventors:

#	Inventor's Name	Inventor's Address
1	BREUER ACHIM	IM MITTELFELD 22, 52074 AACHEN

PCT International Classification Number

D01H 5/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	10162314.3	2001-12-19	Germany