Redraw assembly for bodymaker

A forming assembly for a can bodymaker, the forming assembly comprising:

• a stationary assembly comprising:
• a main frame;
• a die pack coupled to the main frame, the die pack defining an elongated forming passage having a proximal end and a distal end;
• a domer disposed adjacent the distal end of the forming passage;
• a redraw assembly coupled to the main frame adjacent the proximal end of the die pack, the redraw assembly comprising:
• a hold down piston moveably coupled to the main frame so as to be slidable with respect thereto;
• a cam disk moveably coupled to the main frame adjacent the hold down piston so as to be readily rotatable about a rotation axis and engaged with the hold down piston, the cam disk defining a cam profile spaced from the rotation axis a radial distance that varies among different portions of the cam profile, the cam disk engaged with the hold down piston at a point along the cam profile that varies as the cam disk rotates about the rotation axis;
• and
• a motor having an output shaft coupled to the cam disk, the motor being structured to selectively rotate the cam disk about the rotation axis,
• wherein the hold down piston is moveable among at least a first positioning and a second positioning dependent on the rotational positioning of the cam disk with regard to the rotation axis such that as the radial distance of the cam profile increases at the point at which the cam disk is engaged with the hold down piston the hold down piston moves away from the rotation axis and as the radial distance of the cam profile decreases at the point at which the cam disk is engaged with the hold down piston the hold down piston moves toward the rotation axis;
• and
• a moving assembly comprising a ram assembly including a ram body having a proximal end and a distal end,
• wherein, the ram body is structured to be reciprocated through the forming passage of the die pack between a retracted, first position, wherein the distal end of the ram body is spaced from the die pack, and, an extended, second position wherein the distal end of the ram body is adjacent the domer, and
• wherein the hold down piston of the redraw assembly is structured to have a blank holder coupled thereto for engaging and securing a cup adjacent an opening of the die pack prior to the cup being engaged by the ram body.

A can bodymaker comprising:

• a forming system comprising a number of forming assemblies, each forming assembly comprising:
• a stationary assembly comprising:
• a main frame;
• a die pack coupled to the main frame, the die pack defining an elongated forming passage having a proximal end and a distal end;
• a domer disposed adjacent the distal end of the forming passage;
• a redraw assembly coupled to the main frame adjacent the proximal end of the die pack, the redraw assembly comprising:
• a hold down piston moveably coupled to the main frame so as to be slidable with respect thereto, the hold down piston structured to have a blank holder coupled thereto for engaging and securing a cup adjacent an opening of the die pack prior to the cup being engaged by a ram body of the bodymaker;
• a cam disk moveably coupled to the main frame adjacent the hold down piston so as to be readily rotatable about a rotation axis and engaged with the hold down piston, the cam disk defining a cam profile spaced from the rotation axis a radial distance that varies among different portions of the cam profile, the cam disk engaged with the hold down piston at a point along the cam profile that varies as the cam disk rotates about the rotation axis;
• and
• a motor having an output shaft coupled to the cam disk, the motor being structured to selectively rotate the cam disk about the rotation axis,
• wherein the hold down piston is moveable among at least a first positioning and a second positioning dependent on the rotational positioning of the cam disk with regard to the rotation axis such that as the radial distance of the cam profile increases at the point at which the cam disk is engaged with the hold down piston the hold down piston moves away from the rotation axis and as the radial distance of the cam profile decreases at the point at which the cam disk is engaged with the hold down piston the hold down piston moves toward the rotation axis;
• a moving assembly comprising a ram assembly including the ram body having a proximal end and a distal end;
• and
• a ram drive assembly coupled to the moving assembly of each forming assembly, the ram drive assembly being structured, for each forming assembly, to reciprocate the ram assembly through the forming passage of the die pack between a retracted, first position, wherein the distal end of the ram body is spaced from the die pack, and, an extended, second position wherein the distal end of the ram body is adjacent the domer.