DOBBY SHEDDING MECHANISM PDF

Special dobby. Dobby Shedding Mechanism Negative Dobby : When the connecting rod moves up and down and T-lever gives outward and inward movement. According to fabric design, when peg comes in contact with the feeder, then the right portion of feeler is raised and the left portion being lowered. Hooks are lowered as hooks are supported with feeler. When the left end of feeler is lowered then the upper hook came in contact with the upper knife. In this state, when connecting rod moves down, the upper portion of T-leavers gives outward movement.

Author:Kajigami Dilrajas
Country:Ghana
Language:English (Spanish)
Genre:Software
Published (Last):9 August 2008
Pages:401
PDF File Size:9.55 Mb
ePub File Size:5.84 Mb
ISBN:721-1-96892-253-2
Downloads:8653
Price:Free* [*Free Regsitration Required]
Uploader:Melkree



Special dobby. Dobby Shedding Mechanism Negative Dobby : When the connecting rod moves up and down and T-lever gives outward and inward movement. According to fabric design, when peg comes in contact with the feeder, then the right portion of feeler is raised and the left portion being lowered. Hooks are lowered as hooks are supported with feeler. When the left end of feeler is lowered then the upper hook came in contact with the upper knife.

In this state, when connecting rod moves down, the upper portion of T-leavers gives outward movement. As a result, upper portion of S-lever, baulk lever also moves to the right side. Thus a pull create on timber lever and link. Fig: Negative dobby shedding mechanism in textile As outside and inside jack lever joined with the timber lever and link, the lever moves up at the same time.

Hence, the heald shaft rose up. Similarly, when the left end of the feeler is lowered then the lower hook comes in contact with the lower knife. In this case, when connecting rod moves up and the bottom portion of T-lever moves to the right side. As a result, bottom portion of S-lever moves to the right and the same process occurs i. Here, jack levers are moved at the same time.

Hence, the heald shaft again rose. Thus a heald shaft is alternatively rose by the lower knife and upper knife. The shaft will therefore be lowered with the help of return spring and will remain down for the next pick.

Uses of Dobby Shedding in Textile Industry: Major uses of dobby shedding in textile industry have pointed out in the following: In cotton industry, maximum 24 shafts dobbies are used. But mostly 16 to 20 shafts are used. In worsted industry, dobbies with 36 jacks are in uses and many of them are positive in action and suitable for heavy shedding. The chance of pattern in the fabric, in dobby loom, can be readily done where as it is laborious and expensive in case of tappet.

Dobbies offer better facilities for producing a variety of patterns with more number of healds than that is possible with tappets. Dobbies are extensively used for weaving twill, sateen and other simple weaves. Share this post.

ATELOCYNUS MICROTIS PDF

Dobby Shedding Mechanism | Classification of Dobby Shedding

Jacquard shedding Tappet Shedding A tappet is given a rotary motion so that it depresses a follower and a lever, known respectively as the anti-friction bowl and the treadle arrangement, by means of which the heald shaft is operated. The bulkiness of its mechanical movement limits the loom to control up to 8 shafts repeat not more than 8 Therefore, tappet shedding is the simplest and least versatile shedding motion. The design is restricted to plain weave, simple twill and simple sateen or satin weave. Any design more than 8 shafts requires dobby loom. A pair of tappets A and B is fixed to the bottom shaft C at degrees to each other. Two treadle levers D and E are connected to the loom back-rail by a bracket F.

DESCARGAR EL CAMINO DE LA AUTODEPENDENCIA JORGE BUCAY PDF

Dobby Shedding Mechanism?

Pattern chain Dobby shedding mechanism: Here a climax dobby is described to explain the dobby shedding mechanism. Climax dobby is a double lift double jack-lever negative dobby. Here two jack levers are operated by a single bulk lever. They are joined with the bulk lever by a timber lever and a link. The double lever is fulcrum med at a point and is connected with S-lever. Dobby shedding mechanism The S-lever controls two hooks, one upper hook and one lower hook.

DIN 74069 PDF

Fig: Climax Dobby shedding mechanism Climax Dobby shedding mechanism: Here a climax dobby is described to explain the dobby shedding mechanism. Climax dobby is a double lift double jack-lever negative dobby. Here two jack levers are operated by a single bulk lever. They are joined with the bulk lever by a timber lever and a link.

Related Articles