Method and apparatus for perforating and/or severing tubular bodies

Apparatus for making perforations in the walls of tubular workpieces such as synthetic plastic bobbins for textile yarns or the like, comprising perforating means including at least one piercing too;

• means for effecting repeated penetration of selected portions of a workpiece by said perforating means such that the perforation frequency and total number of penetrations of said tool are sufficiently high to measurably raise the temperature of said tool due to friction generated during penetration and extraction of the latter, and such that a perforation is progressively formed at each of the selected portions, said penetration effecting means including means for confining the workpiece against movement in at least one of the directions including axially and radially of the workpiece so as to ensure that the piercing tool repeatedly penetrates into and is repeatedly extracted from the selected portions of the workpiece, said confining means comprising a plurality of rotary confining elements defining for the workpiece a treating station;
• and means for severing the workpiece at said station in at least one plane which is at least substantially normal to the axis of such workpiece.

Apparatus for making perforations in the walls of tubular workpieces such as synthetic plastic bobbins for textile yarns or the like, comprising perforating means including at least one piercing tool;

• means for effecting repeated penetration of selected portions of a workpiece by said perforating means such that the perforation frequency and total number of penetrations of said tool are sufficiently high to measurably raise the temperature of said tool due to friction generated during penetration and extraction of the latter, and such that a perforation is progressively formed at each of the selected portions, said penetration effecting means including means for confining the workpiece against movement in at least one of the directions including axially and radially of the workpiece so as to ensure that the piercing tool repeatedly penetrates into and is repeatedly extracted from the selected portions of the workpiece;
• and means for regulating the temperature of said piercing tool.

Apparatus for making perforations in the walls of tubular workpieces such as synthetic plastic bobbins for textile yarns or the like, comprising perforating means including at least one piercing tool;

• means for effecting repeated penetration of selected portions of a workpiece by said perforating means such that the perforation frequency and total number of penetrations of said tool are sufficiently high to measurably raise the temperature of said tool due to friction generated during penetration and extraction of the latter, and such that a perforation is progressively formed at each of the selected portions, said penetration effecting means including means for confining the workpiece against movement in at least one of the directions including axially and radially of the workpiece so as to ensure that the piercing tool repeatedly penetrates into and is repeatedly extracted from the selected portions of the workpiece;
• and at least one knife for severing the workpiece in a plane which is at least substantially normal to the axis of such workpiece, said knife having a cutting edge which is inclined with reference to a tangent at that locus of the peripheral surface of the workpiece where the cutting edge penetrates into the workpiece.

Apparatus for making perforations in the walls of tubular workpieces, such as synthetic plastic bobbins for textile yarns or the like, comprising perforating means including at least one piercing tool;

• means for effecting repeated penetration of selected portions of a workpiece by said perforating means such that the perforation frequency and total number of penetrations of said tool are sufficiently high to measurably raise the temperature of said tool due to friction generated during penetration and extraction of the latter, and such that a perforation is progressively formed at each of the selected portions, said penetration effecting means including means for confining the workpiece against movement in at least one of the directions including axially and radially of the workpiece so as to ensure that the piercing tool repeatedly penetrates into and is repeatedly extracted from the selected portions of the workpiece;
• means for rotating the workpiece about its axis;
• and a plurality of knives having cutting edges and being movable into engagement with the rotating workpiece so that the cutting edges subdivide the workpiece into a plurality of tubular sections, said cutting edges being staggered with reference to one another so that they being timely to sever the rotating workpiece at spaced intervals.

Apparatus for making perforations in the walls of tubular workpieces such as synthetic plastic bobbins for textile yarns or the like, comprising perforating means including at least one piercing tool;

• means for effecting repeated penetration of selected portions of a workpiece by said perforating means such that the perforation frequency and total number of penetrations of said tool are sufficiently high to measurably raise the temperature of said tool due to friction generated during penetration of the latter, and such that a perforation is progressively formed at each of the selected portions, said penetration effecting means including means for confining the workpiece against movement in at least one of the directions including axially and radially of the workpiece so as to ensure that the piercing tool repeatedly penetrates into and is repeatedly extracted from the selected portions of the workpiece, said confining means defining for the workpiece a treating station;
• and at least one ejector for expelling a workpiece from said station upon completion of the perforating operation, said ejector comprising an elongated support extending substantially parallel with the tubular workpiece at said station and a deformable work-contacting member carried by said support and movable by the support into said station to thereby expel the workpiece from the station.

Apparatus for making perforations in the walls of tubular workpieces such as synthetic plastic bobbins for textile yarns or the like, comprising perforating means having at least one holder and a plurality of piercing tools on said holder;

• means for effecting repeated penetration of selected portions of a workpiece by said perforating means such that the perforation frequency and total number of penetrations of said tools are sufficiently high to measurably raise the temperature of said tools due to friction generated during penetration and extraction of the latter, and such that a perforation is progressively formed at each of the selected portions, said penetration effecting means including means for confining the workpiece against movement in at least one of the directions including axially and radially of the workpiece so as to ensure that each piercing tool repeatedly penetrates into and is repeatedly extracted from a selected portion of the workpiece;
• and means for regulating the temperature of said tools, including ports provided in said holder and arranged to convey a fluid medium to said tools.