This document discusses a double lift double cylinder jacquard, which uses two cylinders that move in opposite directions to control two hooks connected to each warp yarn. It operates at 180 picks per minute, with each cylinder controlling half the picks. The system forms a semi-open shed and allows for higher speeds, longer sets of cords, and less vibration than single cylinder systems. However, its main disadvantage is that if one cylinder gets out of sync with the other, it can weave the wrong design.

1. Department of Textile Engineering
Mehran University of Engineering &
Technology Jamshoro
In double lift double cylinder jacquard both cylinders move in opposite direction. Two hooks
that are in opposite direction are connected to a single warp yarn. In this number of needles
are equal to number of hooks i.e. two single lift single cylinder are connected. Speed of
Double Lift Double Cylinder Jacquard is 180ppm(Picks/mint) , It means speed of each
cylinder will be 90ppm(Picks/mint).
If the direction of both the cylinders become same then the recognition of odd or even pick
would have been difficult. This system forms a semi-open shed.
Advantages:
Following are some advantages of Double lift double cylinder system,
1) Higher operating speed,
2) A very long set of cord is to be worked &
3) Less vibrations among the picks when cylinder strikes its respective needle board.

2. Disadvantages:
The Main disadvantage of this system is that if by chance one cylinder gets ahead of the
other cylinder or is out of the sequence with the other cylinder then a wrong design will be
woven.