Take up mechanism

1. FABRIC
MANUFACTURING
ENGINEERING-2
WELCOME TO OUR
PRESENTATION
DHAKA UNIVERSITY OF ENGINEERING & TECHNOLOGY,
GAZIPUR
Our Presentation Topics
TAKE UP MOTION
1. Md. Ariful Islam ID: 175002
2. Sondip Kumar Roy ID: 175047
3. Abdul Aziz ID: 175053
4. Golam Mortuza Limon ID: 175055
5. Md. Sofiqul Islam ID: 175057
6. Md. Jashiar Rahman ID: 175058
Presented BY:
Mr. Shamsuzzaman Sheikh
Assistant Professor
Department of Textile Engineering
DUET, Gazipur
Presented To:

2. Introduction:
Loom is a mechanical device which is used to produce
woven fabric by the insertion of warp and weft yarn. In
other words, Loom is a mechanical device which
interweaves yarns to fabric, that's fabrics are suitable for
use as dress or industrial uses.
In weaving technology; loom is the principle mechanical
device for weaving. Various types of loom are used for
doing the weaving task. Various types of designed fabric
are produced by changing the machine setting.
Fig: Take up motion m/c
2

3. Motion of loom:
The process of producing a fabric by interlacing warp and weft threads is known as
weaving. The machine used for weaving is known as weaving machine or loom. In
order to interlace warp and weft threads to produce a fabric, the following motions
are necessary on any type of loom. Shedding, Picking, Beating, Let-off, Take-up
are weaving loom motions.
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4. Classification of motion of loom:
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5. Introduction:
Take-up is to draw a fabric to the cloth roller
regularly as it is woven. Texture of a fabric largely
depends upon the number of ends and picks per
centimeter or inch. This motion determines the
number of picks of weft per inch or centimeter and
contributes to the uniform texture of the fabric. It is
the work of the weaver for accurately fixing the
position of the fell of the cloth before starting a loom.
Take up motion:
5

6. Take up motion:
The process of withdrawing fabric from weaving
zone at a constant rate and then winding the woven
cloth on the cloth roller with the continuous progress
of Weaving is called take up motion.
6

7.  To wind the woven cloth on the cloth roller with the progress of weaving
 To pull the fabric forward after beating of inserted pick.
 To maintain the pick per inch required in the fabric.
 To ensure uniform pick spacing through out the fabric.
 To know about drive of the take-up motion.
 To know about the construction of the mechanism
Objectives of the take up motion :
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8. 1. According to drive:
a. Positive take up b. Negative take up
2. According to motion of the cloth/rate of take up:
a. Continuous take-up b. Intermittent take-up
3. According to drive given to the cloth roller:
a. Direct drive take-up b. Indirect drive take-up
4. According to mechanism:
a. 5-wheel take-up b. 6-wheel take-up c. 7-wheel take-up
5. According to brand name:
a. Sulzer take-up b. Pickanol take-up c. Toyota take-up
d. Shirley take-up
Classification of take up motion:
Take up motion can be classified in many way. They are-
8

9.  7 wheel take up mechanism
6 wheel take up mechanism
5 wheel take up mechanism
7-wheel Take up mechanism:
7-wheel take up mechanism is used in case of cotton weaving.
According to mechanism of take up motion are three types:
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10. Fig: 7-Wheel take up mechanism
Related machine parts:
A = Ratchet wheel = 24T
B = Standard wheel = 36T
C = Change wheel = XT
D = Swing pinion = 24T
E = Compound wheel = 89T
F = Compound pinion = 15T
G = Take up wheel = 90T
H = Take up roller = 15.05″ (circum)
K = Retaining catch
L = Pawl
M = Finger
N = Take up lever
10

11. Construction of the 7-wheel take up mechanism:
 In this mechanism take up lever connect both slay Sword add ratchet wheel. For beat
up the ratchet wheel move due to push by the pawl.
 Ratchet wheel connected with standard wheel.
 Standard wheel connected with change wheel and change wheel attach with change
pinion by shaft.
 Change pinion transmit motion to compound wheel which is connected with
compound pinion by shaft.
 Compound pinion transfer motion to take up wheel which connected with take up
roller.
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12. Working principle:
 The pawl move with slay sword which push the ratchet wheel for every beat up.
 Ratchet wheel transfer motion to standard wheel.
 Change wheel received motion from standard wheel, it transfer motion to change
pinion.
 Change pinion sent motion to compound wheel so compound pinion is also
rotate.
 Compound pinion transfer motion to take up wheel so take up roller received
motion.
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13. Calculation of 7-wheel take up motion:
1. PPI calculation:
For one revolution of one teeth of Rachel wheel (A) = 1 pick take up
Then,
No. of revolution of A = 1 x
𝐆×𝐄×𝐂
𝐅×𝐃×𝐁
=1 x
𝟗𝟎×𝟖𝟗×𝑪
𝟏𝟓×𝟐𝟒×𝟑𝟔
13

14. Picks per inch=
𝟗𝟎×𝟖𝟗×𝑪×𝟐𝟒
𝟏𝟓×𝟐𝟒×𝟑𝟔×𝟏𝟓.𝟎𝟓
= 1 x
90×89×60×24
15×24×36×15.05
[C=60]
= 59.13
No. of picks for 1 rev. of H =1 x
90×89×𝐶
15×24×36
14

15. 2. Pick spacing:
Pick spacing is the reciprocal of the pick density
i.e. Pick spacing =
𝟏
𝐏𝐏𝐈
Pick spacing = 𝟏 ×
𝐁×𝐃×𝐅×𝐇
𝐂×𝐄×𝐆×𝐀
=
𝟑𝟔 × 𝟐𝟒 × 𝟏𝟓 × 𝟏𝟓. 𝟎𝟓
𝟔𝟎 × 𝟖𝟗 × 𝟏𝟓 × 𝟐𝟒
= 0.0169 inch (Ans.)
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16. Hence,
PPI = Loom constant x change wheel
= 0.9856 x 60 = 59.136
In the loom the fabric remains under tension. When it is out of loom, it
becomes relaxed. So in relaxed state lengthwise contraction of fabric
increases the PPI of fabric and normally contraction is of 1.5%.
Hence, PPI= 𝟏 ×
𝐆×𝐄×𝐂×𝐀
𝐅×𝐃×𝐁×𝟏𝟓.𝟎𝟓
×
𝟏𝟎𝟎+𝟏.𝟓
𝟏𝟎𝟎
=
𝟗𝟎×𝟖𝟗×𝟔𝟎×𝟐𝟒×𝟏.𝟎𝟏𝟓
𝟏𝟓×𝟐𝟒×𝟑𝟔×𝟏𝟓.𝟎𝟓
= 60.02 (Ans.)
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17. 5-wheel take up motion:
Fig: 5-wheel take up motion
5-Wheel take up mechanism is used in case of jute
weaving.
Where,
A = Ratchet wheel = 50-60T
B = Change wheel = 1/4
C = Stud wheel = 100-120T
D = Stud pinion = 12-18T
E = Take up wheel = 60-100T
F = Take up roller = 15-16″ (circum:)
G = Finger
H = Take up lever
M = Pushing pawl
N = Rotating catch
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18. Working process:
The beam wheel E is set screwed on the beam shaft and its teeth engaged those of
stud pinion D which is connected with stud wheel C.
The stud pinion and stud wheel work loosely upon a stud in a slotted bracket, the
slot is concentric with the cloth beam F.
In this positive take up motion is primarily imparted from the sley sword. The
finger enters into the slot of the take up lever H, which is fulcrumed at I.
A swinging motion is given to the sley sword and this will cause the pawl M to
drive the ratchet wheel A and set the train of wheels in motion.
Ratchet wheel is moved the distance of one tooth by the oscillating pawl for every
pick.
Thus motion is transferred to the cloth roller from the ratchet wheel by means of
five wheels.
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19. Calculation of 5-wheel take-up mechanism:
1.PPI:
For one rev of one teeth of ratchet wheel (A) = 1 pick take up
No of revolution of A for 1 rev of F =1 ×
E×C×A
D×B×F
=
75×120×50
15×B×15
=
2000
B
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20. 2. Pick spacing:
Pick spacing =
𝟏
𝐏𝐏𝐈
=
𝐗
𝟐𝟎𝟎𝟎
Or Pick spacing =
𝐁×𝐃×𝐅
𝐂×𝐄×𝐀
=
𝐁×𝟏𝟓×𝟏𝟓
𝟏𝟐𝟎×𝟕𝟓×𝟓𝟎
=
𝐁
𝟐𝟎𝟎𝟎
20

21. 3.Loom constant:
Loom constant is obtained by taking the no of teeth in change wheel= 1
Loom constant =
𝐄×𝐂×𝐀
𝐃×𝟏×𝐅
Hence, PPI =
𝐋𝐨𝐨𝐦 𝐜𝐨𝐧𝐬𝐭𝐚𝐧𝐭
𝐂𝐡𝐚𝐧𝐠𝐞 𝐰𝐡𝐞𝐞𝐥
Contraction 1.5% is not added due to using coarse fabric, Jute, Blanket, Canvas
fabric.
So, not adding of 1.5% contraction.
21

22. Compare between 7-wheel and 5-wheel take up motion.
Why 7-wheel take up motion is best?
Advantages of Seven wheel take-up motion over Five wheel take-up motion.
Illustrate a typical 7-wheel gearing diagram of take up mechanism .Find out the pick per
inch and loom constant from your sketch. Assume appropriate value for necessary
parameters.
Show the difference between continuous and discontinuous take up motion?
Board questions:
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23. 1. Compare between 7-wheel and 5-wheel take up motion:
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24. 2. Why 7-wheel take up motion is best?
3. Advantages of seven wheel take-up motion over five wheel
take-up motion.
Answer:
1. It can give larger number of picks per inch or 2.54 cm in cloth from a small stock
of wheels by changing two wheels in the train.
2. It can give even a fraction of pick per inch or 2.54 cm in cloth and;
3. The calculation to find out the number of picks per quarter-inch or 0.635 cm in
cloth and number of teeth in the change wheel have been made simplified.
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25. 1. PPI calculation:
For one revolution of one teeth of Rachel wheel (A) = 1 pick take up
Then, No. of revolution of, A= 1 ×
𝐺×𝐸×𝐶
𝐸×𝐷×𝐵
= 1x
90×89×𝐶
15×24×36
No. of picks for 1 rev. of, H = 𝟏 ×
𝟗𝟎×𝟖𝟗×𝑪×𝟒
𝟏𝟓×𝟐𝟒×𝟑𝟔
Picks per inch = 𝟏 ×
𝟗𝟎×𝟖𝟗×𝑪×𝟐𝟒
𝟏𝟓×𝟐𝟒×𝟑𝟔×𝟏𝟓.𝟎𝟓
=
90×89×60×24
15×24×36×15.05
[𝐶 = 60]
= 59.13 (Ans.)
25

26. 4. Iillustrate a typical 7-wheel gearing diagram of take up mechanism.
Find out the pick per inch and loom constant from your sketch.
Assume appropriate value for necessary parameters.
A = ratchet wheel = 24T
B = Standard wheel = 36T
C = Change wheel = XT
D = Swing pinion = 24T
E = Compound wheel = 89T
F = Compound pinion = 15T
G = Take up wheel = 90T
H = Take up roller = 15.05″ (circum)
26

27. 3. Loom Constant: 31
To find out loom constant, the no of teeth in a change wheel is always = 1 i.e. X = 1
PPI = 1 ×
G × E ×C ×A
F×D×B×15.05
= 1 ×
90×89 ×x×24
15 ×24×36×15.05
Loom constant = 1 ×
90×89×1×24
15×24×36×15.05
[x=1]
= 0.9836
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28. Discontinuous take up motion Continuous take up motion
5.Show the difference between continuous and discontinuous take
up motion?
7-wheel take up motion is known as discontinuous and 5-wheel take up motion is known
as continuous take up motion:
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