28
Md. N. H. Nihad et al.
Fig. 4 The accomplished construction of the design
without the help of the bobbin. The sample fabric used here also comprised of 80 %
Cotton and 20 % Polyester. The fabric just had the function of expressing output
whether the stitch was forming properly or not for which it didn’t require any special
properties. Conventional sewing needle made of platinum and titanium alloy were
used to ensure corrosion and abrasion resistance. The installed lubrication system
was modified by adding more lubricating points on the modified parts of the design.
All the Gears, Shafts, and other parts were used in this modification was made of
stainless steel with high quality assuring sustainability in a continuous motion (Figs. 4
and 5).
3 Results and Discussion
The following graphical analysis signifies that just by using the modified bobbinless Lock Stitch Sewing machine a remarkable amount of production time is being
accumulated. It was observed that for a skilled operator it takes about 30 s to replace
an empty bobbin and for continuous production, in each hour the operation is done
twice. To sum up, a sewing line with 10 Lockstitch sewing machine consumes 10 min
every hour which results in about 1.6 h throughout the whole shift. Ultimately, the
increase in efficiency is about 16.66 % more than the conventional lockstitch machine
and the amount increases exponentially with a more large number of machines used
in a continuously running garments factory. This numerical analysis is done based on
the lockstitch sewing machines that have been modified. So, it can be claimed along
Md. N. H. Nihad et al.
Fig. 4 The accomplished construction of the design
without the help of the bobbin. The sample fabric used here also comprised of 80 %
Cotton and 20 % Polyester. The fabric just had the function of expressing output
whether the stitch was forming properly or not for which it didn’t require any special
properties. Conventional sewing needle made of platinum and titanium alloy were
used to ensure corrosion and abrasion resistance. The installed lubrication system
was modified by adding more lubricating points on the modified parts of the design.
All the Gears, Shafts, and other parts were used in this modification was made of
stainless steel with high quality assuring sustainability in a continuous motion (Figs. 4
and 5).
3 Results and Discussion
The following graphical analysis signifies that just by using the modified bobbinless Lock Stitch Sewing machine a remarkable amount of production time is being
accumulated. It was observed that for a skilled operator it takes about 30 s to replace
an empty bobbin and for continuous production, in each hour the operation is done
twice. To sum up, a sewing line with 10 Lockstitch sewing machine consumes 10 min
every hour which results in about 1.6 h throughout the whole shift. Ultimately, the
increase in efficiency is about 16.66 % more than the conventional lockstitch machine
and the amount increases exponentially with a more large number of machines used
in a continuously running garments factory. This numerical analysis is done based on
the lockstitch sewing machines that have been modified. So, it can be claimed along