1. National Institute Of Fashion Technology, Gandhinagar
Ergonomics Workplace Engineering
Practical Ergonomic considerations in
Over Lock Machine.
PRESENTED BY:-
Sapna Devi(18)
M.F.TECH3rdSem
Batch-(2011-13)
9-Dec-12 1
2. Overlock Machine Sewing Station
Design
In sewing station area we have to take care of three things
such as
Chair
Table
Treadle/Pedal
3. Risk Factors at sewing workstation
awkward arm
neck
trunk
and leg postures.
These postures are influenced
by the size of the worker and
the design of the workstation.
Possible solutions
4. Adjustable chair
easily adjustable height, seat
tilt, and backrest position;
no wheels, or wheels that lock;
a gently sloped or "waterfall"
front edge to help prevent the
chair's edge from pressing into
the back of the legs; and
a cushioned/contoured
seat, which distributes the
worker's weight so no body part Padded chair with
gets all the pressure. rounded, waterfall edge.
Narrow back rest is ideal
for twisting jobs.
5. •There should be 2-3 inches between the back of
your leg and the seat of the chair.
•Seat height should be at knee level when
standing
6. The back of the knee should
be slightly higher than the
seat of the chair
The seat may be slightly
lower when the worker uses a
treadle or pedal.
Proper chair height.
16 inches off the floor
(according to the worker
height it may be 18 inch)
7. Incorrect Correct
Table too high, causing worker's Height-adjustable table.
left elbow to be raised. The average adult needs a
table with a surface that's
about 28 inches off the
floor
8. Elbow height is shown by the horizontal broken line. The needle
position is shown by the vertical broken line.
9. Table edges should be
padded or rounded.
Employee leaning on sharp
edges.
Tables should be at elbow
height.
10. The table top should not
press on the worker's thighs.
Workers who use a treadle
need more room than those
who don't so they can move
their legs more easily.
11. Reaching overhead to pick up Lowering the clothing
fabric can cause stress on the rack can minimize
arms, neck, and shoulders. overhead reach.
12. Reaching to the side to place Minimize reach by placing
fabric. material closer to the worker.
13. Reach in three planes
Work pieces, tools and controls
that are in regular use should be
located directly in front of or
near the body.
The reach envelopes in three
planes. The most important
operations should take place
within a radius of
approximately 80 cm.)
14. Incorrect correct
Poorly-designed treadle Treadle that eliminates awkward
causes the worker to use leg posture and requires minimal
awkward posture. force to operate, especially while
standing.
15. A Footrest for supporting left foot
Treadle too close
Place treadle so employee
can get close to table
17. Height of the Hands and Focal Point,
for Carrying Out Various Tasks While Seated or
Standing
Types of task Work Height
Use of eyes: frequent infrequent 10-30 cm below
Use of hands/arms: eye height
Use of eyes: frequent frequent 0–15 cm above
Use of hands/arms: elbow height
Use of eyes: infrequent frequent 0–30 cm below
Use of hands/arms: elbow height
18. Ergonomics distance by taking the
actual Body Measurements
Operator Shoulder to Needle Distance – 19 inch
Operator shoulder to wheel – 23 inch
Operator shoulder to switches – 19 inch
Operator shoulder to tensioner – 16 inch
Operator to Wheel – 12 inch
Eye to needle – 16.5
Operator to table – 12 inch
Height of machine – 10.5
Length of the table – 42 inch
Width of the table – 21.2 inch
Height of the table – 28 inch
Dimensions of the plate– 8.5x4.7 inch
Height of the plate – 3.7 inch
19. Distance b/w pedal and lifter - Diameter of wheel – 2.2
4.5 inch(it should be close to each inch(because the grip of the
other because opening of legs is hand is about 2.2 inch so it is
about 5 inch when stitching as easily movable.
per comfortable
20. Lifter Size
Mannual pressure foot lifter – Length(1 inch)
- Width (0.2 inch)
Because the thumb size is about 1.2 inch so the lifter
size should be according to the thumb. so we can use lift
easily
Operator to table distance
It should be approx.12 inch. It is best for easily movements
of the operator for picking, delivery etc.
21. The machine distance Machine distance from
from the left side -18 inch the right side is 6.5 inch
(For proper handling of for maintaining the
proper distance from the
the fabric, also the place spools
for delivery we can use)
22. Electrically height adjustable
The ideal, ergonomic sit -
down/stand-up workstation
Table tops standard - 1,500 x 800 x
30 mm (approx.59 x 31.5 x 1.2 in.)
4 Utility shelf tiltable - 300 mm deep
(approx. 12 in.)
5 Monitor tray with swing arm - 300
x 300 mm (approx. 12 x 12 in.
Tool balancer load - 0.6 - 2.0 kg
(approx. 1.3 - 4.4 lbs.)
Footrest height adjustable, tiltable
23. Overlock machine ergonomics
MTC System
mtc(micro thread control)
system permitting precise
adjustment of the over-edge
thread length at the simple turn
of the control dial.
24. Automatic safety switch
When the looper cover or
free-arm cover is opened, a
safety switch is
automatically activated that
prevents accidental operation
of the serger.
It offers greater safety during
thread changes and threading
up
25. The LCD screen
LCD screen permanently displays
all important stitch parameters.
LCD display helps to set the right
thread tension and individually set
values can even be stored in the
BERNINA 1300 MDC’s memory.
Settings will then still be available,
even if we switch to another stitch
from time to time.
26. Handwheel position indicator
During a thread change,
we’ll be able to tell at a
glance when the needles
and lower looper are in
the ideal position for
threading.
27. Adjustable thread tension
Thread tension is adjusted via slide
controls which not only afford you
immediate access to the thread tension
but also show you at a glance the
current thread tension for each thread.
28. Automatic cutting
Computer sensing, automatic
cutting lines, cutting belt.
The button type manual cuts
the line electro-magnet type)
to cut the line automatically
around the dust collector (air
operated).
Not returned to the ring or
hand-cut needs to be done,
can improve ergonomics at
least 30%.
29. New oiling & lubrication device
Automatically oiling
system with filter pump
30. Swing-out upper-knife arm for
more space
When we don’t wish to trim the
fabric edge or when you’re
working in coverstitch mode,
this gives you an additional
advantage in terms of sewing
ease, providing you with more
space to give rein to your
creativity.
31. Ergonomic Pedal
The speed, foot-lift and thread
clipping have been separated into two
pressure sensors
Equal pressure on both legs while
standing.
(500 mm x 500 mm = approx. 20 in. x
20 in.)
Sewing speed parameter input and
activation of foot-lift and thread
clipping can now be done by a gentle
weight shift onto the sensor elements.
This efficiently prevents poor body
posture and health problems.
