RIBBON
LAP
MECHANICAL DATA :
Make : Lakshmi Rieter
Model : E 4/1a
No of laps fed : 6 laps
Weight of lap fed : 50 - 75 gm/mtr
Weight of lap delivery : 50 - 75 gm/mtr
Draft permissible : 5
- 8 times
Working speed : 50 - 65 mtr/min
Max lap dia : 450 mm
Lap width : 300 mm
Total weight of lap : 15 kg
Drafting system : 3 over 4 pneumatic
Length of the m/c : 5275 mm
Width of the m/c : 2907 mm
(With lap stand)
WEIGHTS :
Auto lap : 1450 kg
Head stock : 550
kg
Rollers, its support : 900
kg
Total weight : 2900 kg
COMPRESSED AIR :
Pressure : 6 ata
Quantity required : 1.2 Nm3/Hr
POWER DETAILS:
Motor : 4 HP, 1440 rpm, 50 Hz
440
volts
Control voltage : 220 volts at 50 Hz
Contact sheet at drafting: 6
volts
system
Feed sheet : 6
volts
Limit switches : 220 volts
B31, B32 & B33
DRAFTING ROLLER SETTING :
|
50 |
|
40 |
|
30 |
|
20 |
|
10 |
----|-----------------------------------------------------
| 10 20
30 40 50
60 70 80
90 100
100%
A vertical line is drawn at 5% staple in the
staple diagram. A
horizontal line is drawn at the meeting point
of 5% staple
(vertical line with curve). The distance shown in mm in the
dimensions `a'.
GUIDE LINES FOR DRAFTING ARRANGEMENT SETTINGS
: The alphabet `a'
of the table below corresponds to 5% staple
value.
Example: Staple diagram as per
figure
Longest fibre : 45 mm
5% staple `a' : 34 mm
Lap weight : 60 gms/mtr
Distance between bearing of rollers in main drafting zone 5%
staple a: 34 - 28 mm = 6 mm setting distance
Distance between bearing of rollers in main drafting zone 5%
staple a: 34 - 27 mm = 7 mm setting distance
The recommended disstance are to be considered as nominal
values.
LAP WEIGHT |
MAIN DRAFT |BREAK DRAFT | PRESSURE | PRESSUR
(gm/mtr)
|DISTANCE BETW- |DISTANCE BETW- | | LOADING
|EEN ROLLERS(mm)|EEN ROLLERS(mm)|
(ata) | (kg)
55 | a -28
| a -28 |
0.60 | 60
60 | a -28
| a -27 |
0.60 | 60
65 | a -28
| a -27 |
0.75 | 75
70 | a -28
| a -26 |
0.90 | 90
75
| a -28 |
a -26 | 0.90
| 90
| | | |
The
above values will differ slightly depending up on the shape
of the staple diagram.
Ex:- Zone setting is :
Distance between rollers + roller dia + roller dia
2 * 2
DRAFTS :
1. CONSTANT OF MAIN DRAFT :
When break draft is 1.34
: 0.0746 (Constant)
When break draft is 1.024
: 0.0925 (Constant)
Main draft : Constant * number change gear (Wn)
2. CALCULATION OF NUMBER CHANGE GEAR (Wn) :
Total
draft
Number change gear (Wn):----------------------------------
constant of
maindraft * break draft
3. TOTAL DRAFT :
Feed gm/mtr * no of
doublings
Total Draft :
-------------------------------
Delivery gm/mtr
4. BREAK DRAFT :
Break draft can changed by inter changing the double gear
35/40 (See in gearing diagram)
Break draft 1.34 : While working on the long staple it is use
ful to operate the machine with 1.34 break
draft. In this case
40 T gear is in mesh with 18 T gear to the
third roller.
Break draft 1.025: While working with medium and long staple it
is use ful to operate the machine with 1.025
break draft. In
this case 35 T gear is in mesh with 18 T gear
to the third
roller.
LAP WEIGHT (gm/mtr) : To get best results in comber the
following values of the lap weight shall not
be exceed, because
the lap weight depends on both the micronaire
value and no of
fibres in cross section.
gm/mtr| Nm | Micronaire | no of fibres in cross sec
| | |
50 | 0.02
| 3.2 |
4,00,000
| | 3.5
| 3,80,000
55 | 0.0182 |
3.5 | 4,00,000
| | 3.8
| 3,40,000
60 | 0.0167 |
4.0 | 3,82,000
65 | 0.0154 |
4.5 | 3,62,000
70 | 0.0143 |
4.8 | 3,64,000
75 | 0.0133 |
5.0 | 3,83,000
| ; |
SIG NAL LAMPS IN SL & RL:
1. RED LAMP:
1.
If the lamps glows it indicates the building of on
calender roller.
2.
Sliver breakage or can exhaust time SL, lap exhaust
time in RL
3.
Drafting lapping time this lamp will be
glowbed
2.YELLOW LAMP:
1.
If this lamp glows whenever the spool magazine is empty
2.
Lap storage rack is full
3.
Doffing time also the lamp glows
3. GREEN LAMP:
This lamp glows to show the readiness of the machine.
SOME SETTINGS IT EFFECTS:
1. Brake: The break is mounted on the long
shaft it controlled
by
the value s8. The mono meter is in control penel is to be
adjusted, so that the starting of the machine takes 1-2sec.
The
pressure must be kept 1kg/cm2
2. GUIDE SHEET: The function of the delivery
table in conjunction
with
curved sheets is to lay the webs perfectly one upon the
other. The guide plates is to be installed that their edges
are
set parallel exactly with each other.
3. TABLE DELIVERY ROLLERS: The bottom rollers
driven by a pair of
hylam bevel gears in longitudinal shaft. This wheel requires
less
care than metal and there fore frequent lubrication is
not
required.
4. TENSION MECHANISM: The selection of
tension drafs is very
important for proper doubling of six webs. The draft between
front roll to calender roller and over curve plate controlled
by
the delivery gear (wa) between table calender roll to
calender roll controlled by (wt). Adjusted both to have
minimum tension. The best method to select the no of teeth
gear
required according count.
5. FEED END; The lap is placed on the two
feed rollers provided
with
flutes. At the sides the lap guidestable bars, these
adjustable bars adjusted to the nominal lap width + 5mm.
while the diameter is at largest.
AUTOLAP OPERATION; (The lap changes take
places follows)
COMMENDER 1; Preselection length of laps less
then 1 meter,switch
of the motor indirectly and switch on the
value s1 and s2.
-The machine stops and the clutch K
disengages
-The lapping apparatus is dis connected; the
lap is relieved
-Piston*turns the lap roller by 1.3m and the
lap is served.
COMMENDER-2; Final selection comes into
action. Desired length of
lap : and switch on the value s3 (discs-up
& discs open) Lap
heads are lifted and the lap is released. The
limit switch b5
is actuated at the sametime.
LIMIT SWITCH B-5:
1. Switch on the values s4 s5 (magazine
lifted & downed )
2. Lap spool magazine swing in wards. Pushes
the full lap out
and
supplies fresh lap spool.
3. Spool magazine on reading its and position
actuates the limit
switch b6.
LIMIT SWITCH B-6:
1. Switch on the values s6 and s7 (lapstand
piston pushed come
back)
2. full lap which as been pushed out is
pushed aside on
reaching the end of its stroke. The piston V actuates
limit switch b12.
LIMIT SWITCH B-12:
1.Resets the commender.
COMMENDER V-1: Switch off values s1,s2 and
s3. Clutch K re-
engages, severing piston * turns to starting
position.
3. Lap
heads grip the lap spool, move downward away from
switch B5 actuates the limit switch B14
imit switch B14
1.switch off values S4 and S5
2.Now spool magazine moves back away from
limiit switch B6 and
actuates limit switch B13
3.the return motion of the magazine is thus
delay do until the
limit
switch b14 is pressed. This helps to avoid the rubbing
of
lap discs with spool magazine.
4. Spool magazine moves back away from limit
switch b6 and
actuaes b13.
LIMIT SWITCH B-13: Switch on the machine again.
EMERGENCY SWITCH: Can be operated in case of any disturbance
in order to renitiate the lap change.
SWITCH POSITIONS:
1.Normal running
2.New lap (actuates value
s2-s3-s4and
s-5 )
When the switch points to
this symbal
the lap headds raised and
spool magazine
swings in.
3.Free lap (actuates s-2 and
s-3 )
If the swich points to this symbal, the lap
heads are raised but spool
magazine does not
swing in.
SAFETY SWITCHES:
Limit swich b-7: As soon as the lap heads have reached
their
lowest position (with spool ) they actuate
limit switch b-7. The
latter keeps the machine switch on and
transgers the switch off
function to the time relay d-11. This time
relay (0.2 - 5sec)
stop the machine again if the lap heads donot
raise correctly.(if
the lap does not warp it self round the
spool)
Limit switch b-8: Switches off the machine if the couner fails
to work.
Limit swich b-9: Prevent the machine from running if the lap
spool has not been put it.
Limit switch b-10: Stop piston for pushing if the lap storage
rack is fully occupied.
Limit switch b-11: Prevent the machine from
running if the front
door is not closed.
ELECTRO VALUES: Electro values s1,s3,s5 and
s7 discharge air when
no energised. Electrovalues s2,s4,s6,s8 and
s10 discharge air
when energised. Electrovalues s9 discharges
air when enerised
(for RL only)
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