#Digital jacquard design. pdf plus#

The first controls the odd hooks and the second controls the even hooks. One hook (odd numbered) controls the neck-cord in the odd picks and the other hook (even numbered) controls the neckcord in the even picks. The pair of hooks is connected to one neck-cord. Here each needle controls two consecutive hooks (pair). Harness cord is lifted by one of the two hooksДouble-Lift Single-Cylinder (D.L.,S.C.) В„ Two griffes move up and down in opposition over a two-pick cycle One needle and two hooks, for every end in the design These considerations drastically limit the speed at which the loom can be run.ДЄdditionally, the lifted warp ends are highly strained and this may cause end breakage.Дouble lift - single cylinder Two sets of knives, each mounted in a griffe the rate of reciprocation is halved. This requires more time to form the shed. The cylinder must reciprocate and turn, and the griffe must rise and fall every pick.

There is therefore much wasted movement, together with a tendency for the whole harness to swing. In single lift jacquard, the shed is formed by raising the hooks by the knives (i.e. Mechanical Jacquard : Single liftSingle cylinderД¤00= 8 x 50 One needle and one hook for every end in the design: 400 needles, 400 hooks, 400 independent end lifts The knives in turn move up and down hooks to form the shed according to the weave design. It is the connection which controls the up and down movements of the knives. The mechanism consists of levers that connect the main shaft to the knives. The mechanism that links the engine to the weaving machine Knives, hooks, needles, springs, and card cylinder, endless paper pattern neck-cords, harness cords, mails, and weights (spring or elastomer) Hooks, neck-cords, harness cords, mails, and weights (spring or elastomer)ДЄ Jacquard machine may be divided into three main parts: The mechanism that links the engine to the weaving machine Knives ( set of knives) needles, springs, card cylinder, and endless paper pattern

Three principal motion in the jacquard shedding. Hook is the main lifting element of the jacquard shedding. of hooks can be given to define the size of jacquard, say, 600-hook jacquard.

#Digital jacquard design. pdf plus#

It has twelve horizontal rows of needles placed one above the other with 50 needles in each row, plus a few extra needles. of picks in the weave repeatДЎ2 is known as short row, 50 is known as long row.

The term вЂpitchвЂ™ refers to the distance between the needle centers.Дesign capacity of the jacquard for the control of the ends Number of independent end lifts that can obtained Virtually unlimited for the no.

Most of the rest are general purpose types that are comparatively easy to classify.Д®nglish pitch (coarse pitch) В„ Mechanical В„ Single lift /double lift В„ Coarse Vienna pitch: 6.82 mm x 6.82 mm or 5.77mm x 5.11 mm French or Continental pitch (fine pitch) В„ Mechanical or electronic В„ Single lift /double lift В„ Vincenzi / Verdol В„ French Laccase pitch: 4.00 mm x 4.00 mm Verdol pitch: 3.00 mm x 3.00 mm StaubliвЂ™s UNIVAL 100 Jacquard GrosseвЂ™s UNISHED Jacquard Many specialized types of jacquard machine have been developed for weaving particular kinds of fabric, such as terry towels, damasks, and carpets. In jacquard weaving, it is possible to control every warp yarn individually. Jacquard shedding mechanisms are capable of producing large and intricate weave designs that are beyond the scope of dobby shedding mechanisms.