Manufacture of boxes with integrally reinforced walls

A machine for forming a container out of any one of a wide range of sizes of flat blanks of a paperboard material, comprising:

• a mainframe having coaxially aligned die means and mandrel means, both of which means are size adjustable, and further having a stop means that is adjustable relative to the common axis of said mandrel means and die means;
• an inner feed frame;
• means interconnecting said inner feed frame to said main frame for adjusting the position of said inner feed frame relative to said main frame while maintaining the longitudinal centerline of said inner feed frame in alignment with the axis of said mandrel means and die means;
• an inner blank feed means affixed to said inner feed frame for conveying a blank through said inner feed frame and into said main frame;
• said inner feed frame also having alternately extendable and retractable second stop means thereon in a position upstream of said inner blank feed means;
• an outer feed frame;
• means interconnecting said outer feed frame to said inner feed frame for adjusting the position of said outerfeed frame relative to said second stop means while maintaining the longitudinal centerline of said outer feed frame in alignment with the longitudinal centerline of said inner feed frame;
• an outer blank feed means affixed to an upstream part of said outer feed frame for alternately conveying a blank into said outer feed frame to and against said extendable second stop means or out of said outer feed frame and into said inner feed frame upon retraction of said extended second stop means;
• and a pair of mechanisms adjustably fixed to said outer feed frame to permit varying the spacing therebetween along the longitudinal centerline of said outer feed frame,
• said pair of mechanisms being means for performing an operation on a blank that has been arrested in said outer feed frame by said extended second stop means.