COMBER-E7/4
TECHNICAL-DATA
Make
- Lakshmi rieter
Model
- E7/4
No. of heads
- 8
Count of sliver delivered
- Ne 0.12 - 0.20
K TEX 5
- 3
Drafting arrangement : 3 over 4
Drafting range : 4.9 to 10.0
Waste % : 5 to 25 %
Out put/ m/c : 16 to 40 kg/hr
(At 90% effy)
Feed lap weight : 50 to 70 gr/mtr
Lap Max dia : 500 mm
Lap width : 300 mm
Length of the m/c : 5.619 mtrs
Width of the m/c :
1.506 mtrs
(Including waste containers)
Can sizes Diameter :
16", 18", 20"
Can height : 42"
POWER DETAILS :
Stop motor : 2.2 Kw / 0.16 HP
Speed : 1350 rpm at 50 Hz
Flange motor : 1.2 Kw / 4.0 HP
Speed : 2860 rpm at 50 hz
COMPRESSED AIR DETAILS :
Consumption/machine : 0.2 Nm3/Hr
Connecting pressure : 6 - 8 ata
WEIGHT DETAILS :
Roller beam : 485
Kg
Head stock : 1300 Kg
Delivery combination : 1600 Kg
THEORY OF COMBING : In general combers can divided into two
categories.
1. Backward feed, 2. Forward feed
Backward feed : The material is fed whilst the nipper is
rocking back wards.
Forward feed
: The material is ;fed whilst
the nipper is
rocking forwards.
The following abbrevations are employed in
further :
F
max (mm) : Maximum fibre length
F
0 (mm) :
Mean fibre length
P (%) :
Waste percentage\
A (mm) :
Amount feed per nep
L (mm) :
Detaching distance
(The distance between
the nipping points
of nipper and the
detaching rollers,
when the nipper is in
its for most
position)
Back ward feed : The greater amout of feed per nip and the
higher percentage of waste possible.
Forward feed
: The greater amout of feed
per nip and the
Lower percentage of waste possible.
Comparision between forward and backward feed
with different
settings :-
Detaching distance : The waste percnetage changed as follows
when the setting of detaching distance is
altered in steps of
2 mm.
Back ward feed : F max : 40 mm A : 5.6
L : 15 mm
(15 + 5.6/2) - 100
P
% : ---------------------- : 19.8 %
(40)
Forward feed : F max : 40 mm A : 5.6
L : 15 mm
(15 - 5.6/2) - 100
P
% : ---------------------- : 19.8 %
(40)
Amount of feed per nip : By altering the amount of feed by one
tooth, approximately 0.3 - 0.5 mm/nip. By the following
alterations waste percentage is also alters.
F
am : 40 mm A : 6.0 L : 15 mm
(15 + 6.0/2) - 100
Back
ward feed P % : ---------------------- : 20.3%
(40)
(15 - 6.0/2) - 100
Forward feed
P % : ---------------------- : 9.0
%
(40)
USE OF FEED FOR DIFFERENT STAPLE :
For ward feed : For ward feed is used mostly for medium and
short staple cottons,with awaste range 6-18%
Backward feed : Backward feed is intended for use ;with long
staple cotton and super combed yarns in order
to obtain highest
cleanliness and top quality of product within
waste percentage
14 - 25 %
Adjustment modifications and their influence
on waste percnetage:
Here again it is not give exact figures, so that the
following details simply serve as a guide to
alterations of waste
percentage.
1.
Detaching distance changed by 1 mm : Approx 2.0 - 2.5 %
2.
Ratchet wheel on feed roller changed : Approx 0.5 - 1.0%
by
1 T
3.
Forward feed and back ward feed : Approx 4 - 6 %
4.
Depth or penetration of top comb by 0.5mm : Approx 2%
5. No
of needle bars reduced by 2 : Approx 1.5 - 2.0 %
(Bar no :14 & 13 or 12 & 11)
NOTE :
1. Detaching distance increase means waste% increases
2. Backward feed gives higher waste% & forward feed gives
Less waste%
3. No of teeth of ratchet reduces means increase waste%
4. Topcomb penetration towards the positive side gives
higher waste%
5. No of needle bars reduced means waste% also reduced
NEEDLING :
1.
Normal needling with top combs with 26 needle/cm
for medium counts
Micronaire value : 5.0 - 6.0 Microns/inch
Lap weight : 60 - 75 gr/mtr
2.
Normal fine needling with topcomb with 26 needle/inch
Micronaire value : 4.0 - 5.0 Microns/inch
Lap weight : 60 - 70 gr/mtr
3.
Fine needling with topcomb with 30 needle/inch
Micronaire value : 3.0 - 4.5 Microns/inch
Lap weight : 50 - 60 gr/mtr
CONTROLLING POINTS FOR THE EVENNESS OF THE
SLIVER :
1.
Regulate the waste percentage
2.
Control wheel setting (see the web on the black boards
and ascertain (determine) the best setting by
comparison
3.
Regulate the machine to highest cleanliness of web
If necessary adjust the circular combs
Reasons for poor U % values :
1.
Irregular and poorly aligned feed laps
(check previous machines )
2.
Unfavorable air condition, Temperature below 22
C
3.
Badly cleaned machine, where by lap tensioning rollers,
lips of nippers, web trays, table, guidance of the sliver
at the outlet, air duct and perforated drums are of
special importance (Clean with chalk powder and not with
talc powder)
4.
Lap tension roller set wrongly
5.
Damage of circular combs
6.
Poor top detaching rollers. (ie. taper
is not in
accordance with instruction)
7.
Weighting of top detaching roller insufficient
8.
Table trumpets are too small
9.
Top table calender roller binding
10. Poorly set drafting arrangement and web side guides.
Automatic slow motion in comber E 7/4 : The E 7/4 comber is
equipped with and automatic slow motion for
following reasons.
1.
The circular combs fillup in the time during
operation
thus increasing the amount of waste produced.
2.
Morever the cleaning action of circular combs impaired,
so the circular combs is impaired , so that nep count
rises.
3.
While increase in the number of neps influence the
quality, the increase in the amount of waste
predominantly of economic significance as it effects the
cost of manufacture.
4.
E 7/4 comber equipped with slow motion the gearing is
driven a certain time greatly reduced speed, while the
circular comb brushes to continue to run at normal
speed. As a result of ;this ;the
circular comb are
cleared very intersively.
5.
Set timing relay for automatic slow motion to 30
minutes. Duration of slow speed
interval should be equal
to 3 revolutions of circular comb through cleaning
brush. Check the noil percentage
re-adjust comber if
necessary. Normally the interval
during with machine
operates at normal speed last from 10 to 30 minutes with
5 minutes graduations. The time for cleaning with the
brushes.
Unicomb
| N/cm | stpl
| micr | P %
| lap | Ne
| remarks
Type
| | length | value | |
wt | |
| | upto |
over | upto | |
|Short staple
1400 | 26 |
1 1/8" | 4 |
14 | 70 |
40 |50% combing
| | |
| | |
|
1400
F |
26 | ALL |
Full |8 - 25| 65
| 80 |Short & middle
| (30) | | Range
| | |
|normal combing
| | |
| | |
|
1400
F |
30 | Above |
up to |12- 20| 60 | 120 |Long staple
(1400 NSF)| (32) | 1 3/16"| 4.5
| | |
| Normal combing
| | |
| | |
|
1400 NSF
| 26 |
ALL | up to |14- 25|
60 | 120 |Middle & long
90 degrees|
30 | |
4.8 | |
| |normal combing
| | |
| | |
|
NOTE : Nitto uni comb type 1400 - 385 points/inch
Nitto uni comb type 1400 F - 420
points/inch
Nitto Unicomb body dia - 80
mm
Only
in 1400 NSF 90 degree - 85 mm
P % means -
Waste %
Lap weight -
gr/mtr
TIMING AND
SETTING IN E 7/4 COMBER :
Circular com setting : Index 38
The distance between the tip of the (Unicomb)
needle bar and the
perphery of the detaching roller should bne
set with gauge.
Tighten the clamping screws firmly and take
care that circular
combs are set evenly in the middle of each
head. Use of this
setting, maintained all unicombs make actions
at same times.
Nippers and mass balancing device : Index
24
The 12 mm gauge is to ;be ;held under the
nipper shaft and the
shaft of balanceing device. Tighten the bottom parts of nipper
rockers with the screws at the sides until
the 12 mm stud touches
the guage.
Use of this setting, nippers are
self-supporting
construction , very careful balancing of ;the
mass is essential
when operating at 200 - 240 nip/min. While the nipper is moving
forward, the counter balancing moves
backwards and thus
compensates the inertia of force.
Top combs :
Index 24
The top combs must be reset with guage each
time the detaching
distance is altered equal penetration in
between heads it gives
correct noil% head to head and also better
setting high nip
removal efficiency.
Circular waste brushes : Set new brushes (110 mm ) at 89.5 mm
between the roller beam and boss bit. The setting between
unicomb to brush generally 0.5 mm. Reverse direction of rotation
of old brushes for better cleaning
action. Correct setting makes
better noil removal and less loading of
unicomb.
Distance between circular comb and nipper
: Turn the circular
comb shaft until the tip of top nipper jaws
comes to lie above
the middle of the comb needles. Check with feeler gauge whether
the space between needle tip and nipper tip
measure 0.3 - 0.6 mm
Correct settings makes uniform noil% and
uniform nep removal.
Wider setting makes poor combing, closer
setting makes damage to
unicombs.
Distance between bottom nipper to back
detatching roller :
Index
24 : waste index
5 : The nipper must to be
accurately to 6.2 mm gauge between the front
edge of the nipper
and the detaching roller. The setting must be checked with
6.2 mm gauge across the full width of the
nipper. This standard
setting help good performance of nipper grip.
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