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US 4,991,388 AGranted
Draft device in spinning machine
AssigneeMurata Kikai Kabushiki Kaisha
InventorHisaaki Kato
Life of this patent
Estimating the term…
Abstract
A draft device in a spinning machine comprising a pair of back rollers, a pair of middle rollers each provided with an apron belt, and a pair of front rollers. An outer peripheral part of the driving-side of middle roller is formed of a rubber.
Claims11
A draft device in a pneumatic spinning machine, comprising:
- two apron belts, each apron belt composed of a rubber material, the two apron belts defining a sliver running path therebetween;
- two rotatably driven rollers, each rotatably driven roller being associated with a respective one of the apron belts and having an outer peripheral surface composed of a rubber material and in contact with the associated apron belt for driving the associated apron belt.
A draft device in a pneumatic spinning machine, comprising:
- a pair of back rollers,
- a pair of middle rollers, each of said middle rollers having an outer peripheral surface,
- a pair of apron belts, each of said apron belts being in driving contact with the outer peripheral surface of one of said middle rollers, and
- a pair of front rollers,
- wherein said outer peripheral surface of each of said middle rollers and said apron belts are composed of substantially identical rubber materials.
2 more elements
A draft device in a pneumatic spinning machine, comprising:
- top and bottom back rollers pressed against each other,
- top and bottom middle rollers pressed against each other, each of said top and bottom middle rollers provided with an apron belt,
- top and bottom front rollers pressed against each other, and
- drive means for driving said bottom back rollers, said bottom middle rollers and said bottom front rollers whereby said top back rollers, said top middle rollers and said top front rollers are rotated by receiving driving force from the bottom back rollers, the bottom middle rollers and the bottom front rollers through surface contact,
- wherein the outer peripheral surface of said top and bottom middle rollers and said apron belts are composed of substantially identical rubber materials.
2 more elements
A draft device in a spinning machine, comprising:
- a pair of rotatably driven rollers, each rotatably driven roller having an outer peripheral surface made of a rubber material;
- a pair of apron belts, each apron belt being associated with a respective one of the rotatably driven rollers and each apron belt being made of said rubber material, each apron belt being in contact with said outer peripheral surface of the associated roller and defining a closed path around the associated roller;
- whereby at least one of the rotatably driven rollers imparts a driving force on an associated apron belt for driving the associated apron belt about said closed path.
A draft device in a spinning machine, comprising:
- first and second apron belts, each apron belt made of a rubber material and defining a closed path;
- first and second rotatably driven rollers, each rotatable roller having an outer peripheral surface made of said rubber material, said first and second rollers being disposed within said closed paths defined by the first and second apron belts, respectively, said outer peripheral surface of said first roller being in driving contact with said first apron belt;
- drive means for rotatably driving said first roller so as to drive said first apron belt about said closed path;
- whereby the amount of slipping occurring between the rotatably driven first roller and the first apron belt is reduced by employing the same rubber material for the surface of the first roller which contacts the first apron belt as is employed for the first apron belt.
1 more element
Dependencies are inferred from the claim text.