Back to results
US 4,224,967 AGranted
Warp tension control mechanism for loom
AssigneeNissan Motor Co., Ltd.
InventorNaoji Tagawa
Life of this patent
Estimating the term…
Abstract
In order to keep the tensions applied to the warp yarns within a predetermined range throughout the weaving operation of the loom, an improved warp tension control mechanism is herein proposed which generally comprises a length regulating mechanism for regulating the length of the warp yarns fed from a yarn beam per unit time, a tension lever for applying tensions to the warp yarns by the aid of biasing mechanism, and a tension reducing mechanism which is operative to lessen the biasing force produced by the biasing mechanism thereby to reduce the tensions in the warp yarns in response to the continuous reduction of the outside diameter of the body of the warp yarns wound on the beam.
Claims11
A warp tension control mechanism for a loom having a warp yarn beam on which warp yarns are wound in a roll form, comprising:
- a swingable elongate member having guide means over which the warp yarns fed from said beam pass, said swingable elongate member being swingable about a fulcrum thereof in accordance with the degree of tensions applied to said warp yarns fed from said beam;
- biasing means for biasing said swingable elongate member to swing in a direction to apply via said guide means tensions to said warp yarns;
- a first member having at one end an elongate slot, a pin extending through said slot fixed to said swingable elongate member at a location opposite to said guide means with respect to said fulcrum spacedly so that the swingable movement of said swingable elongate member in said direction beyond a given degree brings said pin into contact with an end of said elongate slot to move said first member in one direction;
- a second member pivotally supported on a stationary member of said loom and having an end pivotally connected to the other end of said first member, said second member being provided with position holding means for holding said second member in a selected angular position;
- a third member pivotally supported on said stationary member and having an end engageable with a portion of said second member so that the degree of the pivotal movement of said third member in one direction depends on the degree of the pivotal displacement of said second member induced by the movement of said first member in said one direction;
- a fourth member having a portion periodically engageable with a portion of said third member under rotation thereof to cause swinging movements of said third member;
- converting means for converting said swinging movements of said third member to a rotational movement of said beam in a direction to feed said warp yarns therefrom such that the rotation speed of said beam depends on the degree of the swinging movements of said third member;
- and
- tension reducing means for permitting said biasing means to produce reduced biasing force for said swingable elongate member in accordance with the reduction of the outside diameter of the body of the wound warp yarns on said beam so that the tensions applied to said warp yarns are kept within a predetermined limited range throughout the weaving operation of the loom.
6 more elements
A warp tension control mechanism for a loom having a warp yarn beam on which warp yarns are wound in a roll form, comprising in combination:
- a swingable elongate member having guide means over which the warp yarns fed from said beam pass, said swingable elongate member being swingable about a fulcrum thereof in accordance with the degree of tensions applied to said warp yarns fed from said beam;
- biasing means for biasing said swingable elongate member to swing in a direction to apply via said guide means tensions to said warp yarns;
- regulating means for regulating the length of the warp yarns fed from said beam per unit time in accordance with the variations in swingable movement of said swingable elongate member;
- and
- tension reducing means for permitting said biasing means to produce reduced biasing force for said swingable elongate member in accordance with the reduction of the outside diameter of the body of the wound warp yarns on said beam so that the tensions applied to said warp yanrs are kept within a predetermined limited range throughout the weaving of the loom,
- wherein said biasing means is a spring having one end connected to a stationary member of said loom and wherein said tension reducing means comprises a slider member longitudinally slidably mounted on said swingable elongate member at the opposite position of said guide means with respect to said fulcrum, said slider member being pivotally fixed to the other end of said spring, a swingable lever unit having one end thereof connected through a connecting rod to said slider member and the other end thereof contacting via feeler means the outer cylinder surface of the body of said warp yarns wound on said beam, said swingable lever unit being rotatable about a portion defined between said ends of the swingable lever unit in such a manner that a rotation of said swingable lever unit induced by the reduction of the outside diameter of the body of the wound warp yarns on the beam causes said slider member to slide on said swingable elongate member toward said fulcrum.
3 more elements
A warp tension control mechanism for a loom having a warp yarn beam on which warp yarns are wound in a roll form, comprising in combination:
- a swingable elongate member having guide means over which the warp yarns fed from said beam pass, said swingable elongate member being swingable about a fulcrum thereof in accordance with the degree of tensions applied to said warp yarns fed from said beam;
- biasing means for biasing said swingable elongate member to swing in a direction to apply via said guide means tensions to said warp yarns;
- regulating means for regulating the length of the warp yarns fed from said beam per unit time in accordance with the variations in swingable movement of said swingable elongate member;
- and
- tension reducing means for permitting said biasing means to produce reduced biasing force for said swingable elongate member in accordance with the reduction of the outside diameter of the body of the wound yarns on said beam so that the tensions applied to said warp yarns are kept within a predetermined limited range throughout the weaving operation of the loom,
- wherein said biasing means is an elongated flexible weight member and wherein said tension reducing means comprises a swingable lever member swingable about one end thereof, the free end of said swingable lever member being fixed to one end of said elongated flexible weight member;
- a connecting rod pivotally connecting said swingable lever member at a location between the pivoted end of the same and said free end of said same to a portion of said swingable elongate member at a location opposite to the guide means with respect to said fulcrum, a swingable lever unit having one end thereof contacting via feeler means the outer cylindrical surface of the body of the wound warp yarns on the beam;
- a flexible rope connecting the other end of said swingable lever unit to the other end of said elongated flexible weight member;
- rope guide means for guiding said rope so as to lift up the other end of said elongated flexible weight member as said swingable lever unit rotates in a direction about a portion thereof other than the both ends of said swingable lever unit, and a spring for urging said swingable lever unit to rotate in a direction to press said feeler means against the outer cylindrical surface of said body, said swingable lever unit being rotatable about said portion thereof in such a manner that the rotation of said swingable lever unit in said direction is caused by the reduction of the outside diameter of the body of the wound warp yarns on the beam by the aid of the biasing force produced by said spring.
6 more elements
Dependencies are inferred from the claim text.