Warp tension control mechanism for loom

Claim 2

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.

Claim 3

A warp tension control mechanism as claimed in claim 1, in which said biasing means is a spring having one end connected to a portion of said swingable elongate member, said portion being opposite to said guide means with respect to said fulcrum and in which said tension reducing means comprises a swingable lever unit having one end thereof connected to the other end of said spring and the other end thereof contacting via feeler means to the outer cylindrical 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 in such manner that the rotation of said swingable lever unit in one direction induced by the decrease of the outside diameter of said body of said warp yarns wound on the beam causes said spring to generate reduced biasing force thereby reducing the tensions in the warp yarns extending from said beam.

Claim 4

A warp tension control mechanism as claimed in claim 1, in which said biasing means is a spring having one end connected to a stationary member of said loom and in which said tension reducing means comprises a slider member longitudinally slidably mounted on said swingable elongate member opposite to 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 cylindrical 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 in such a manner that a rotation of said swingable lever unit induced by the decrease of the outside diameter of the body of said wound warp yarns on the beam causes said slider member to move on said swingable elongate member toward said fulcrum.

Claim 5

A warp tension control mechanism as claimed in claim 1, in which said biasing means comprises a weight and in which said tension reducing means comprises a swingable lever member swingable about one end thereof; a slider member longitudinally slidably mounted on said swingable lever member, said slider member supporting said weight; a swingable lever unit having one end thereof connected through a first connecting rod to said slider member and the other end thereof contacting via feeler means the outer cylindrical surface of the body of said warp yarns wound on the beam; 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; and a second connecting rod pivotably connecting said swingable lever member at a location between the pivoted end of the same and the slider member to a portion of said swingable elongate member at a location opposite to the guide means with respect to said fulcrum, said swingable lever unit being rotatable about a portion thereof other than said both ends in such a manner that the rotation of said swingable lever unit in one direction induced by the decrease of the outside diameter of the body of said wound warp yarns on the beam by the aid of the biasing force produced by said spring causes said slider member to move on said swingable elongate member toward said one end of the same.

Claim 6

A warp tension control mechanism as claimed in claim 1, in which said biasing means is an elongated flexible weight member and in which said tension reducing means comprises a swingable lever member swingable about one end thereof, the free end of said swingable lever member being fixed with 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 the 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 said 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 said both ends; 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 the 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.

Claim 7

A warp tension control mechanism as claimed in claim 1, further comprising a spring for biasing said third member to swing in a direction to cause said end of said third member to abut on said portion of said second member.

Claim 8

A warp tension control mechanism as claimed in claim 6, in which said second member has an elongate slot and in which said position holding means comprises: a pin fixed to said stationary member and passing spacedly through said elongate arcuate slot formed in said second member; and a spring disposed about said pin and compressed between an outer face of said second member and a head section of said pin.

Claim 9

A warp tension control mechanism as claimed in claim 7, in which said elongate arcuate slot in said second member has a center of curvature at a portion where said second member is pivoted to said stationary member.

Claim 10

A warp tension control mechanism as claimed in claim 8, in which the pivotal connections between said second member and the stationary member and between said third member and the stationary member comprise a common shaft.

Claim 11

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.

Claim 12

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.

Claim 13

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.

Claim 14

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.