Process and apparatus for compensating the yarn tension difference between two yarns on a spindle drive type winding machine

Claim 2

A process for compensating for differences in tension between two running strands on a spindle drive type strand winding machine wherein the strands are concurrently and at equal speed taken up onto separate packages mounted on a common spindle driven for rotation by an electric torque motor, the process comprising, in a sequenced combination: resiliently amplifying an increase in tension of at least one of the two strands applying the strand tensions increase so amplified to the corresponding package so that the electric torque motor is braked and the speed of the spindle is lowered; lowering by angularly displacing an operation arm guiding the run of each strand as a result of the spindle rotation deceleration and; acclerating the rotation of said electric torque motor in accordance with the degree of the angular displacement of said operation arm.

Claim 3

A process of compensating the yarn tension as claimed in claim 1, further comprising the steps of guiding each of the strands on one of two dancer arms each pivotally mounted for angular displacement, and spring biasing both of the dancer arms into an equilibrium position for a desired yarn tension on both strands wherein the spring force opposes movement of the dancer arms in response to an increase in yarn tension; whereby the spring force acts only on the dancer arm that is already in its equilibrium position during the step of accelerating the torque of the electric torque motor and furthermore, when both yarns tensions are equally increased in value, said spring force acts upon both dancer arms.

Claim 4

A spindle-drive type strand winding machine, for taking up two yarns at a constant linear speed continuously onto two separate packages on a common driving spindle simultaneously, the compensating apparatus comprising, in combination: a spindle with two packages; an electric torque motor for driving the spindle; two dancer rollers; two dancer arms for supporting the two dancer rollers respectively; a lever arm; a lever mounted on the lever arm and engaging said dancer arms from above; at least one spring urging the lever downward; an operation shaft; an operation arm secured on the operation shaft and engaging said dancer arms from underneath; means for maintaining said operation arm and dancer arms in contact; a differential transformer responsive to the angular displacement of said operation shaft to vary the voltage for the torque motor.

Claim 5

A spindle-drive type strand winding machine, for taking up two yarns at a constant linear speed continuously onto two separate packages on a common driving spindle simultaneously, the compensating apparatus comprising, in combination: a spindle with two packages; an electric torque motor for driving the spindle; two dancer rollers; two dancer arms for supporting the two dancer rollers respectively; a lever arm; a lever mounted on the lever arm and engaging said dancer arms from above; at least one spring urging the lever downward; an operation shaft; an operation arm secured on the operation shaft and engaging said dancer arms from underneath; means for maintaining said operation arm and dancer arms in contact; a differential transformer responsive to the angular displacement of said operation shaft to vary the voltage for the torque motor.

Claim 6

A compensating apparatus of the yarn tension as claimed in claim 3, wherein, the pair of dancer arms, the lever arm, and an arm connected to the operation arm are coaxially mounted on a common axis.

Claim 7

A compensating apparatus of the yarn tension as claimed in claim 4, wherein, the common axis is arranged in parallel to the axis of the winding apparatus.

Claim 8

A compensating apparatus of the yarn tension as claimed in claim 3, wherein, the lever extends over a portion of both of the dancer arms.

Claim 9

A compensating apparatus of the yarn tension as claimed in claim 6, wherein only one spring is provided for urging the lever arm downward.

Claim 10

A compensating apparatus of the yarn tension as claimed in claim 3, further comprising urging means for urging the operation arm to slightly touch the dancer arms at the horizontal position of said dancer arm, wherein the operation arm is almost at its upper-most position of angular displacement.

Claim 11

A compensating apparatus of the yarn tension as claimed in claim 8, wherein, said urging means is a spring.

Claim 12

A compensating apparatus of the yarn tension as claimed in claim 8, wherein said operation arm extends over a portion of both of the dancer arms.

Claim 13

A process for compensating for variations in tension from a given tension for two strands running concurrently and at equal speeds in a spindle drive type winding apparatus wherein the strands are wound into two separate packages rotably mounted on a common spindle, the process comprising the steps of: guiding each of the strands on one of two dancer arms each pivotally mounted independently for angular displacement in one direction in response to an increase in the tension of the associated strand and for angular displacement in the other direction in response to a decrease in the tension of the associated strand; biasing both of the dancer arms into an equilibrium position corresponding to said given tension on both strands wherein the biasing force opposes movement of the dancer arms in response to an increase in tension; decreasing the winding speed of both strands in response to the angular displacement of at Least one of said dancer arms in said one direction thereby decreasing the tension in both strands to angularly displace both of said danger arms an equal distance in said other direction until said one dancer arm is substantially in its equilibrium position and the other dancer arm is angularly displaced in said other direction; and increasing the winding speed of both strands in response to the angular displacement of at least one of the dancer arms in said other direction in proportion to the angular displacement of the dancer arm angularly displaced in said other direction to increase the tension in both strands to restor both dancer arms into said equilibrium position.

Claim 14

A process for compensating for variations in tension from a given tension for two strands running concurrently and at equal speeds in a spindle drive type winding apparatus wherein the strands are wound into two separate packages rotably mounted on a common spindle, the process comprising the steps of: guiding each of the strands on one of two dancer arms each pivotally mounted independently for angular displacement in one direction in response to an increase in the tension of the associated strand and for angular displacement in the other direction in response to a decrease in the tension of the associated strand; biasing both of the dancer arms into an equilibrium position corresponding to said given tension on both strands wherein the biasing force opposes movement of the dancer arms in response to an increase in tension; decreasing the winding speed of both strands in response to the angular displacement of at Least one of said dancer arms in said one direction thereby decreasing the tension in both strands to angularly displace both of said danger arms an equal distance in said other direction until said one dancer arm is substantially in its equilibrium position and the other dancer arm is angularly displaced in said other direction; and increasing the winding speed of both strands in response to the angular displacement of at least one of the dancer arms in said other direction in proportion to the angular displacement of the dancer arm angularly displaced in said other direction to increase the tension in both strands to restor both dancer arms into said equilibrium position.

Claim 15

In a spindle drive type winding apparatus for winding two concurrently running strands at equal winding speeds into two separate packages rotatably mounted on a common spindle, a device for compensating for variations in the tension of the two strands from a given tension comprising: means for guiding the two strands including two dancer arms; means pivotally mounting each dancer arm independently for angular displacement in one direction in response to an increase in the tension of the associated strand and for angular displacement in the other direction in response to a decrease in the tension of the associated strand; means biasing both of said dancer arms into an equilibrium position corresponding to said given tension on both strands wherein the biasing force opposes movement of the dancer arms in response to an increase in tension; first means responsive to the angular displacement of at least one of said dancer arms in said one direction for decreasing the winding speed of both strands thereby decreasing the tension in both strands to angularly displace both of said dancer arms an equal distance in said other direction until said one dancer arm is substantially in its equilibrium position and the other dancer arm is angularly displaced in said other direction; and second means responsive to the angular displacement of at least one of said dancer arms in said other direction for increasing the winding speed of both strands in proportion to the angular displacement of the dancer arm angularly displaced in said other direction to increase the tension in both strands to restore both dancer arms into said equilibrium portion.

Claim 16

In a spindle drive type winding apparatus for winding two concurrently running strands at equal winding speeds into two separate packages rotatably mounted on a common spindle, a device for compensating for variations in the tension of the two strands from a given tension comprising: means for guiding the two strands including two dancer arms; means pivotally mounting each dancer arm independently for angular displacement in one direction in response to an increase in the tension of the associated strand and for angular displacement in the other direction in response to a decrease in the tension of the associated strand; means biasing both of said dancer arms into an equilibrium position corresponding to said given tension on both strands wherein the biasing force opposes movement of the dancer arms in response to an increase in tension; first means responsive to the angular displacement of at least one of said dancer arms in said one direction for decreasing the winding speed of both strands thereby decreasing the tension in both strands to angularly displace both of said dancer arms an equal distance in said other direction until said one dancer arm is substantially in its equilibrium position and the other dancer arm is angularly displaced in said other direction; and second means responsive to the angular displacement of at least one of said dancer arms in said other direction for increasing the winding speed of both strands in proportion to the angular displacement of the dancer arm angularly displaced in said other direction to increase the tension in both strands to restore both dancer arms into said equilibrium portion.

Claim 17

In an apparatus according to claim 12, wherein first means comprises a first pivotally mounted lever arm and a first member attached to one end thereof and extending over both dancer arms and wherein said means biasing comprises a spring biasing said first member into contact with said dancer arms.

Claim 18

In an apparatus according to claim 13, wherein said second means comprises a second pivotally mounted lever arm and a second member attached to one end thereof and extending below both dancer arms and means biasing said second member into contact with said dancer arms.

Claim 19

In an apparatus according to claim 14, wherein said first and second lever arms and said dancer arms are pivotally mounted on a common axis.

Claim 20

In apparatus according to claim 12, wherein both of said first and second means are responsive to the angular displacement of either one and both of said dancer arms.