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Textile core having improved start-up groove
| Details |
Inventors: Rummage, Tony F.;
Assignee: Sonoco Products Company (Hartsville, SC)
Primary Examiner: Gilreath; Stanley N.
Assistant Examiner:
Attorney, Agent or Firm: Bell, Seltzer, Park & Gibson
The invention provides textile cores having improved start-up grooves. In a preferred embodiment the start-up groove has a generally V shaped cross-section and at least one longitudinal portion of the groove, preferably the trailing portion of the groove, has at least one compound angle sidewall defined in longitudinal cross-section by a plurality of alternating, substantially rectangular tongue and notch sections extending along the sidewall. In accordance with another aspect of the invention, improved grooving blades for textile cores are formed using an electric discharge machining (EDM) process. |
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DETAILED DESCRIPTION In the parent of this application U.
S.
Ser.
No.
07/893,408, now U.
S.
Pat.
No.
5,211,354 certain textile cores having improved start-up grooves are disclosed, as are improved processes for forming them.
The present invention provides further textile cores having improved start-up grooves which can be readily formed in a single operation and which are capable of improved engagement of incoming yarn lines of various sizes.
The improved start-up grooves of the invention include compound surfaces in longitudinal cross-section such that there are alternating tongues and notches on a portion of at least one sidewall of the start-up groove.
The tongues extend into the start-up groove for improved grasping of the incoming yarn line.
The improved textile cores of the invention are capable of engaging various different sized yarns with no or minimal modification of the new start-up groove configuration, with the advantageous result that the number of different groove configurations for varying yarn sizes can be decreased.
Yarn cores provided according to this invention or according to the parent application hereof, U.
S.
Ser.
No.
07/893,048, now U.
S.
Pat.
No.
5,211,354 can be manufactured in accordance with another aspect of the invention using an appropriate compound angled edge knife blades which are prepared according to another aspect of the invention using an electric discharge machining (EDM) process.
The EDM process can readily provide compound, and multiple compound cutting surface knife blades and, in addition, can provide knife blades capable of providing a textured or matte finish on the inside surface of the start-up groove for improved grasping of the in-coming yarn line.
In addition, the EDM manufacturing process provides significant benefits and advantages as compared to conventional grinding processes for preparing conventional ground surface grooving blades.
In one aspect of the invention textile yarn cores are provided having an elongate tubular body formed of paperboard, or the like and have a substantially cylindrical groove for gripping an incoming yarn line formed in at least a portion of the periphery of the tubular body adjacent one end thereof
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