Introduction of Dobby Loom
This particular specimen resides in
Concordia's textile lab
This particular loom is called dobby loom.A Dobby Loom is a
loom in which each harness can be selected
without using treadles; a manual dobby uses a
chain of bars or lags each of which has pegs
inserted. The pegs select the harness to be moved. A
computer assisted
dobby loom uses a computer program to
select which harness is to be moved. In either case the
harnesses are lifted or sunk by either
legpower on a dobby pedal or electric or
other power sources. This is in contrast to a treadle
handloom, where the harnesses are attached by
cords to a limited number of different
treadles to select and move the harnesses.
Dobby looms allow a huge
variety of weave structures which a treadle loom
might not, due to the lack of treadles. A
floorloom is limited in the amount of
treadles it can use within the loom frame, but a dobby
need only add bars to the dobby chain to
enlarge the loom's weave capacity. A normal
eight harness floorloom has ten or twelve
treadles but a dobby device mounted on the same loom
will use a chain of bars ranging from twelve
to seventy. The
average dobby chain will have approximately
fifty bars.
A Jacquard loom is an
example of an adaptation from a dobby loom. A
Jacquard device mounted atop a loom will lift the
individual heddles and warp threads. The
individual heddles and warp threads can be
controlled by a computer or a series of punched cards
which select them to rise or fall. Power is
usually supplied to the loom to move the
many heddles involved.
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