Jute Draw Frame Machine: Parts, Specification, Material Passage & Calculation

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Last Updated on 24/02/2021

Experiment Name:
Study on the Jute 1st draw frame machine.

Objectives:

  1. To individualize jute fibers.
  2. To straighten the fibers.
  3. To make the fibers in sliver more or less parallel to one another.
  4. To reduce sliver weight per unit length.
  5. To increase the uniformity of sliver.
  6. Minimization of irregularity by doubling.

Main parts Jute 1st draw frame:

  1. Fluted feed roller.
  2. Retaining rollers (front and back)
  3. Slip roller.
  4. Feed plate.
  5. Faller bar.
  6. Drawing roller.
  7. Drawing pressing roller.
  8. Delivery roller.
  9. Delivery pressing roller.
  10. Doubling plate.
  11. Roll former.
  12. Back plate.
  13. Faller carrier separate.
  14. Gill pin.
  15. Guide plate.

Material Passage of Jute 1st Draw Frame Machine:
The machine can be roll-fed. For the roll feeding a roller feeder (fluted feed roller) is necessary. Again the delivery may be taken in roll form by a roll-former at the delivery end. The sliver feed end pass side by side over the feed plate and then under the back retaining roller, over the slip roller and again under the front retaining roller. The slivers then pass over the moving gills being penetrated in their pins at the centre. After necessary drafting the slivers pass between the drawing and drawing pressing rollers to the doubling plate. Here the slivers are grouped in equal numbers for doubling. Then they are passed through a pair of delivery rollers and at last collected in roll former by a roller former.

Material passage diagram of jute 1st draw frame
Fig: Material passage diagram of jute 1st draw frame

A= Back plate;
B= Back Retaining roller;
C= Jockey or slip roller;
D= Front Retaining roller;
E= Faller carrier sprocket;
F= gill pin;
G= Drawing roller;
H= Drawing pressing roller;
I= Guide plate;
J= Doubling plate;
K= Delivery roller;
L= Delivery pressing roller

Gearing diagram of jute 1st draw frame
Fig: Gearing diagram of jute 1st draw frame

Specification:

  • Motor RPM = 1450
  • Motor pulley = 3.4²
  • Machine pulley = 20.4²
  • SCP (speed change pinion) = 48T
  • Drawing roller wheel = 60T
  • Diameter of drawing roller = 2.5²
  • Drawing roller pinion = 30T
  • Intermediate wheel (drawing to delivery) = 109T
  • Delivery roller wheel = 41T
  • Delivery roller diameter = 3.5²
  • Faller bar driving sprocket = 22T
  • DCP (draft change pinion) = 37T
  • Front retaining roller driving wheel = 34T Retaining roller dia = 2.25²

Calculation:

  • Surface speed of back retaining roller = 409.98 inch/min
  • Surface speed of drawing roller =1518.43inch/min.
  • Surface speed of delivery roller = 1555.47 inch/min.
  • Faller drops/min = faller bar rpm teeth of faller carrier sprocket.= 937.1 drops/min.
  • Faller bar surface speed= faller drops/min* pitch of faller = 937.1

You will find details in below image:

calculation of 1st draw frame

Result:

  • Surface speed of back retaining roller = 409.98 inch/min
  • Surface speed of drawing roller = 1518.43 inch/min.
  • Surface speed of delivery roller = 1555.47 inch/min.
  • Faller drops/min = 937.1 drops/min.
  • Faller bar surface speed = 468.54 inch/min.
  • Draft = 3.8
  • Draft constant =140.38
  • Faller lead% = 14.3%

Conclusion:
This experiment is very important for us to know and learn about jute 1st draw frame. By this experiment we come to know the gearing diagram and its draft, faller bar lead% and surface of different rollers.

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