Apparel Online Bangladesh Magazine Magazine March 2018 | Page 49

machine configuration as compared to
2:2 configuration (two operators for 2
workstations), refer Exhibit 1.2.
Model 1278-6 from Atlanta Attachment Company incorporates a cylinder arm overlock sewing head with vacuum thread
trimmer giving a precise cut
Exhibit 1.1: Bottom Rib Attach Operation
Machine
Make Machine
Model/
Serial No. Machine/
Operation
Type Juki DDL 5550N Bottom
Band
Attachment Pegasus EXT5104-
04/433-4/
KS/FR151 Semi
Automatic Atlanta
Attachment
Company 1:1
Conf iguration 1278-6 Automatic 7.65 7.2
Atlanta
Attachment
Company 1:2
Configuration 1278-6 Automatic 7.65 7.2
Loading for
stitching
(with
allowance)
Sewing
(with
allowance)
Unloading
after
stitching
(with
allowance)
Total Average
Cycle Time
(Secs) (with
allowance) Prod./
Machine/
Hr. X No. of
machines
manned (Pcs) Prod./
Shift
(Pcs)
31 31 116 929
14 14 267 2133
2.0 14.9 242 1939
2.0 14.9 457 3657
Pegasus
and Atlanta
Attachment
Company are
prominent brands
in the market,
offering automatic
bottom rib attach
workstations.
Conclusion
Use of technology has been
successfully demonstrated in
improving productivity and
manpower utilization for bottom
rib attache operation. Use of
automats in deskilling the job, by
minimizing human intervention is
also demonstrated. Even though the
automats are more suitable for the
bulk manufactured products that
offer longer runs for smaller orders,
these machines can be utilized as
external tasks by designing the line
plans accordingly.
Exhibit 1.2: Production Loss for AAC 1278-6 1:2 and 2:2 configurations
Time Loss/Cycle (Secs) Time Loss/Hr. (Secs) Prod. Loss/Hr. (Pcs) Prod. Loss/Shift (Pcs)
0.45000 212 27 221
system for band and body panel.
It is also equipped with pneumatic
expansion rollers that facilitates
loading of band and body panel
to the sewing head. The machine
has automatic stacking device that
withdraws the sewn panel from the
sewing position and stacks them
automatically. The operator’s task
is limited to folding the circular rib
knit piece in half to form a band and
placing it over the expansion guide
rollers. The rollers automatically
expand to load the body. The body
is loaded over the rollers and band,
and start sensor expands the rollers
to sew position and indexes the
parts under the presser foot and
sew cycle begins. The operator is
then free to load band and body
panel on the second machine.
When the finished seam is detected
at the needlepoint, the parts are
sewn further till a predetermined
distance, thread chain is cut, and the
part is automatically stacked. The
productivity of the machine in 1:1,
man pieces to-machine configuration
is 242 pieces per hour and 1,939
pieces per shift, while in 1:2
configuration machine productivity
is 457 pieces per hour and 3,657
pieces per shift. There is a loss of
27 pieces per hour in 1:2 man-to-
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