Apparatus and method of producing yarn reserves on bobbin-receiving members

Claim 2

In combination with a rotatable sleeve for winding of a bobbin of yarn thereon in a first zone, a stationary yarn guide spaced from said sleeve to direct the yarn to said sleeve in a tangential plane therewith, and a yarn traversing guide projecting into said plane between said sleeve and said stationary yarn guide for moving the yarn reciprocally across said zone; an apparatus for building up a yarn reserve on said sleeve outside said zone comprising a stationary cam mounted between said stationary yarn guide and said sleeve in lateral relation to said zone, said stationary cam having an elongated yarn guiding surface for receiving the yarn thereon, said yarn guiding surface being shaped to increasingly deflect the yarn out of said tangential plane and to control the axial movement of the yarn as the yarn moves along said surface in the direction of said zone.

Claim 3

The combination as set forth in claim 1 wherein said yarn guiding surface is located in a plane intersecting said tangential plane above the rotational axis of said sleeve.

Claim 4

The combination as set forth in claim 2 wherein said yarn guiding surface is a plane curve successively approaching said zone of said sleeve.

Claim 5

The combination as set forth in claim 3 wherein the degree of approach of said plane curve yarn guiding decreases with the approach towards said zone.

Claim 6

The combination as set forth in claim 1 wherein said yarn guiding surface begins at a point located 1.4 to 1.8 times the diameter of said sleeve radially from the rotation axis of said sleeve.

Claim 7

The combination as set forth in claim 1 wherein said yarn guiding surface is slightly convex in a direction towards said sleeve radially.

Claim 8

The combination as set forth in claim 1 wherein said yarn guiding surface ends at a point located 1.1 to 1.6 times the diameter of said sleeve radially from the rotation axis of said sleeve.

Claim 9

In combination with a rotatable sleeve for winding of a bobbin of yarn thereon in a first zone, a stationary yarn guide spaced from said sleeve to direct the yarn to said sleeve in a tangential plane therewith, and a yarn traversing guide projecting into said tangential plane between said sleeve and said stationary yarn guide for moving the yarn reciprocally across said zone; an apparatus for building up a yarn reserve on said sleeve outside said zone comprising a cam mounted between said stationary yarn guide and said sleeve in lateral relation to said zone, said cam having a yarn guiding surface for receiving the yarn, said surface being disposed to pass through said tangential plane in a plane inclined at an angle of from 30* to 120* with respect to said tangential plane to increasingly deflect the yarn out of said tangential plane as the yarn moves along said surface in the direction of said zone.

Claim 10

In combination with a rotatable sleeve for winding of a bobbin of yarn thereon in a first zone, a stationary yarn guide spaced from said sleeve to direct the yarn to said sleeve in a tangential plane therewith, and a yarn traversing guide projecting into said tangential plane between said sleeve and said stationary yarn guide for moving the yarn reciprocally across said zone; an apparatus for building up a yarn reserve on said sleeve outside said zone comprising a cam mounted between said stationary yarn guide and said sleeve in lateral relation to said zone, said cam having a yarn guiding surface for receiving the yarn, said surface being disposed to pass through said tangential plane in a plane inclined at an angle of from 30* to 120* with respect to said tangential plane to increasingly deflect the yarn out of said tangential plane as the yarn moves along said surface in the direction of said zone.

Claim 11

In combination with a rotatable sleeve for winding of a bobbin of yarn thereon in a first zone, a stationary yarn guide spaced from said sleeve to direct the yarn to said sleeve in a tangential pLane therewith, and a yarn traversing guide projecting into said plane between said sleeve and said stationary yarn guide for moving the yarn reciprocally across said zone; an apparatus for building up a yarn reserve on said sleeve outside said zone comprising a cam mounted between said stationary yarn guide and said sleeve in lateral relation to said zone, said cam having a surface for receiving the yarn, said surface being shaped to deflect the yarn out of said tangential plane, said cam surface beginning at a point located laterally outside a radial plane passing through an end of said sleeve and ending at a point immediately adjacent a radial plane passing through the beginning of said first zone.

Claim 12

In combination with a rotatable sleeve for winding of a bobbin of yarn thereon in a first zone, a stationary yarn guide spaced from said sleeve to direct the yarn to said sleeve in a tangential pLane therewith, and a yarn traversing guide projecting into said plane between said sleeve and said stationary yarn guide for moving the yarn reciprocally across said zone; an apparatus for building up a yarn reserve on said sleeve outside said zone comprising a cam mounted between said stationary yarn guide and said sleeve in lateral relation to said zone, said cam having a surface for receiving the yarn, said surface being shaped to deflect the yarn out of said tangential plane, said cam surface beginning at a point located laterally outside a radial plane passing through an end of said sleeve and ending at a point immediately adjacent a radial plane passing through the beginning of said first zone.

Claim 13

In combination with a rotatable sleeve for winding of a bobbin of yarn thereon in a first zone, a stationary yarn guide spaced from said sleeve to direct the yarn to said sleeve in a tangential plane therewith, and a yarn traversing guide projecting into said plane between said sleeve and said stationary yarn guide for moving the yarn reciprocally across said zone; an apparatus for building up a yarn reserve on said sleeve outside said zone comprising a cam mounted between said stationary yarn guide and said sleeve in lateral relation to said zone, said cam having a surface for receiving the yarn, said surface being of curvilinear shape to deflect the yarn out of said tangential plane, wherein a tangent to the beginning of said cam surface encloses an angle of approximately 30* to 40* with a line parallel to the rotation axis of said sleeve in the plane of said cam surface.

Claim 14

In combination with a rotatable sleeve for winding of a bobbin of yarn thereon in a first zone, a stationary yarn guide spaced from said sleeve to direct the yarn to said sleeve in a tangential plane therewith, and a yarn traversing guide projecting into said plane between said sleeve and said stationary yarn guide for moving the yarn reciprocally across said zone; an apparatus for building up a yarn reserve on said sleeve outside said zone comprising a cam mounted between said stationary yarn guide and said sleeve in lateral relation to said zone, said cam having a surface for receiving the yarn, said surface being of curvilinear shape to deflect the yarn out of said tangential plane, wherein a tangent to the beginning of said cam surface encloses an angle of approximately 30* to 40* with a line parallel to the rotation axis of said sleeve in the plane of said cam surface.

Claim 15

The combination as set forth in claim 10 wherein a tangent to the center of said cam surface encloses an angle of approximately 15* to 30* with said line.

Claim 16

In combination with a rotatable sleeve for winding of a bobbin of yarn thereon in a first zone, a stationary yarn guide spaced from said sleeve to direct the yarn to said sleeve in a tangential plane therewith, and a yarn traversing guide projecting into said place between said sleeve and said stationary yarn guide for moving the yarn reciprocally across said zone; an apparatus for building up a yarn reserve on said sleeve outside said zone comprising a cam mounted between said stationary yarn guide and said sleeve in lateral relation to said zone, said cam having a surface for receiving the yarn, said surface being of curvilinear shape to deflect the yarn out of said tangential plane, wherein a tangent to the end of said cam surface adjacent said zone encloses an angle of approximately 5* to 20* with a line parallel to the rotation axis of said sleeve in the plane of said cam surface.

Claim 17

In combination with a rotatable sleeve for winding of a bobbin of yarn thereon in a first zone, a stationary yarn guide spaced from said sleeve to direct the yarn to said sleeve in a tangential plane therewith, and a yarn traversing guide projecting into said place between said sleeve and said stationary yarn guide for moving the yarn reciprocally across said zone; an apparatus for building up a yarn reserve on said sleeve outside said zone comprising a cam mounted between said stationary yarn guide and said sleeve in lateral relation to said zone, said cam having a surface for receiving the yarn, said surface being of curvilinear shape to deflect the yarn out of said tangential plane, wherein a tangent to the end of said cam surface adjacent said zone encloses an angle of approximately 5* to 20* with a line parallel to the rotation axis of said sleeve in the plane of said cam surface.

Claim 18

In combination with a rotatable sleeve for winding of a bobbin of yarn thereon in a first zone, a stationary yarn guide spaced from said sleeve to direct the yarn to said sleeve in a tangential place therewith, and a yarn traversing guide projecting into said plane between said sleeve and said stationary yarn guide for moving the yarn reciprocally across said zone; an apparatus for building up a yarn reserve on said sleeve outside said zone comprising a cam mounted between said stationary yarn guide and said sleeve in lateral relation to said zone, said cam having a surface for receiving the yarn, said surface being shaped to increasingly deflect the yarn out of said tangential plane as the yarn moves along said surface in the direction of said zone and means pivotally mounted to project into the path of the yarn on said surface for abutting the yarn to hold the yarn against travel on said surface.

Claim 19

In combination with a rotatable sleeve for winding of a bobbin of yarn thereon in a first zone, a stationary yarn guide spaced from said sleeve to direct the yarn to said sleeve in a tangential place therewith, and a yarn traversing guide projecting into said plane between said sleeve and said stationary yarn guide for moving the yarn reciprocally across said zone; an apparatus for building up a yarn reserve on said sleeve outside said zone comprising a cam mounted between said stationary yarn guide and said sleeve in lateral relation to said zone, said cam having a surface for receiving the yarn, said surface being shaped to increasingly deflect the yarn out of said tangential plane as the yarn moves along said surface in the direction of said zone and means pivotally mounted to project into the path of the yarn on said surface for abutting the yarn to hold the yarn against travel on said surface.

Claim 20

The combination as set forth in claim 13 which further comprises a pneumatic system connected to said means to pivot said means into and out of the path of the yarn and a time relay connected to said system for activating said system after a predetermined period of time.

Claim 21

In combination with a rotatable sleeve for winding of a bobbin of yarn thereon in a first zone, a Stationary yarn guide spaced from said sleeve to direct the yarn to said sleeve in a tangential plane therewith, and a yarn traversing guide projecting into said plane between said sleeve and said stationary yarn guide for moving the yarn reciprocally across said zone; an apparatus for building up a yarn reserve on said sleeve outside said zone comprising a cam mounted between said stationary yarn guide and said sleeve in lateral relation to said zone, said cam having a surface for receiving the yarn, said surface being of curvilinear shape to deflect the yarn out of said tangential plane wherein a tangent to the beginning of said cam surface encloses an angle of less than 90* and a tangent to the end of said cam surface encloses an angle of greater than 0* respectively with a line parallel to the rotation axis of said sleeve in a plane of said cam.

Claim 22

In combination with a rotatable sleeve for winding of a bobbin of yarn thereon in a first zone, a Stationary yarn guide spaced from said sleeve to direct the yarn to said sleeve in a tangential plane therewith, and a yarn traversing guide projecting into said plane between said sleeve and said stationary yarn guide for moving the yarn reciprocally across said zone; an apparatus for building up a yarn reserve on said sleeve outside said zone comprising a cam mounted between said stationary yarn guide and said sleeve in lateral relation to said zone, said cam having a surface for receiving the yarn, said surface being of curvilinear shape to deflect the yarn out of said tangential plane wherein a tangent to the beginning of said cam surface encloses an angle of less than 90* and a tangent to the end of said cam surface encloses an angle of greater than 0* respectively with a line parallel to the rotation axis of said sleeve in a plane of said cam.

Claim 23

In combination with a rotatable sleeve for winding of a bobbin of yarn thereon in a first zone, a stationary yarn guide spaced from said sleeve to direct the yarn to said sleeve in a tangential plane therewith, and a yarn traversing guide projecting into said place between said sleeve and said stationary yarn guide for moving the yarn reciprocally across said zone; an apparatus for building up a yarn reserve on said sleeve outside said zone comprising a cam mounted between said stationary yarn guide and said sleeve in lateral relation to said zone, said cam having an elongated yarn guiding surface for receiving the yarn, said surface being shaped to increasingly deflect the yarn out of said tangential plane as the yarn moves in the direction of said zone, said surface ending at a point immediately adjacent a radial plane passing through the beginning of said first zone to permit the yarn to snap into said yarn traversing guide upon moving from said surface.

Claim 24

In combination with a rotatable sleeve for winding of a bobbin of yarn thereon in a first zone, a stationary yarn guide spaced from said sleeve to direct the yarn to said sleeve in a tangential plane therewith, and a yarn traversing guide projecting into said place between said sleeve and said stationary yarn guide for moving the yarn reciprocally across said zone; an apparatus for building up a yarn reserve on said sleeve outside said zone comprising a cam mounted between said stationary yarn guide and said sleeve in lateral relation to said zone, said cam having an elongated yarn guiding surface for receiving the yarn, said surface being shaped to increasingly deflect the yarn out of said tangential plane as the yarn moves in the direction of said zone, said surface ending at a point immediately adjacent a radial plane passing through the beginning of said first zone to permit the yarn to snap into said yarn traversing guide upon moving from said surface.

Claim 27

A method as set forth in claim 17 wherein the deflected yarn is shifted slowly and at a substantially uniform speed towards said bobbin receiving zone.

Claim 28

A method as set forth in claim 18 which further comprises the step of interrupting the shifting of the yarn for a predetermined period of time to build up a waste bunching on the sleeve in said first zone.

Claim 29

A method as set forth in claim 19 wherein said step of interrupting occurs a short time prior to return of the yarn into said tangential plane.

Claim 30

A method as set forth in claim 17 wherein said step of shifting increases the amount of deflection on a decreasing gradient.