Redraw assembly for bodymaker

Patent metadata

Field	Value
Publication number	US-11766711-B2
Application number	US-202016885757-A
Country	US
Kind code	B2
Filing date	May 28, 2020
Priority date	May 28, 2020
Publication date	Sep 26, 2023
Grant date	Sep 26, 2023

Abstract

A redraw assembly for a can bodymaker includes a frame and a hold down piston moveably coupled to the frame so as to be slidable with respect thereto. The hold down piston is structured to have a blank holder coupled thereto for engaging and securing a cup adjacent an opening of a die pack. The redraw assembly further includes a cam disk engaged with the hold down piston and moveably coupled to the frame so as to be readily rotatable about a rotation axis and a motor having an output shaft coupled to the cam disk. The motor is structured to selectively rotate the cam disk about the rotation axis. The hold down piston is movable among a first positioning and a second positioning dependent on the positioning of the cam disk.

First claim

What is claimed is:

1. A redraw assembly for a can bodymaker, the redraw assembly comprising:
a frame;
a hold down piston moveably coupled to the 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 a die pack prior to the cup being engaged by a ram body of the bodymaker;
a cam disk moveably coupled to the 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.

2. The redraw assembly of claim 1 , further comprising the blank holder coupled to the hold down piston, wherein:
when disposed in the first positioning, the hold down piston and the blank holder are structured to be spaced from the die pack, and
when disposed in the second positioning, the hold down piston and the blank holder are structured to be disposed immediately adjacent the die pack.

3. The redraw assembly of claim 1 , wherein:
the cam disk comprises a groove defining the cam profile;
the hold down piston comprises a roller extending therefrom; and
the roller is disposed in, and engages with, the groove.

4. The redraw assembly of claim 1 , wherein the cam disk comprises a first cam disk engaged with the hold down piston on a first side of the hold down piston and a second cam disk engaged with the hold down piston on a second side of the hold down piston opposite the first side.

5. The redraw assembly of claim 1 , wherein:
the hold down piston is movable along a translation axis among the first positioning and the second positioning, and
the translation axis is perpendicular to the rotation axis.

6. The redraw assembly of claim 1 , wherein the motor comprises a servo motor.

7. The redraw assembly of claim 1 , wherein the cam disk includes a radially outward facing outer edge surface facing and engaged with the hold down piston.

8. The redraw assembly of claim 7 , wherein the hold down piston is biased against the outer edge surface of the cam disk by a number of biasing members.

9. 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.

10. The forming assembly of claim 9 , further comprising the blank holder coupled to the hold down piston, wherein:
when disposed in the first positioning, the hold down piston and the blank holder are spaced from the die pack, and
when disposed in the second positioning, the hold down piston and the blank holder are disposed immediately adjacent the die pack.

11. The forming assembly of claim 9 , wherein:
the cam disk comprises a groove;
the hold down piston comprises a roller extending therefrom; and
the roller is disposed in, and engages with, the groove.

12. The forming assembly of claim 9 , wherein the cam disk comprises a first cam disk engaged with the hold down piston on a first side of the hold down piston and a second cam disk engaged with the hold down piston on a second side of the hold down piston opposite the first side.

13. The forming assembly of claim 9 , wherein:
the hold down piston is movable along a translation axis among the first positioning and the second positioning, and
the translation axis is perpendicular to the rotation axis.

14. The forming assembly of claim 9 , wherein the motor comprises a servo motor.

15. The forming assembly of claim 9 , wherein the cam disk includes an outer edge surface engaged with the hold down piston.

16. The forming assembly of claim 15 , wherein the hold down piston is biased against the outer edge surface of the cam disk by a number of biasing members.

17. 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

Assignees

• Stolle Machinery Co Llc

Inventors

• Fleischer Karl S
• Scholey Ian Kenneth
• Ribeiro Leonardo Antonio Butolo
• Praturlon Sylvan Mario

Classifications

• B21D51/2669 Primary

  Transforming the shape of formed can bodies; Forming can bodies from flattened tubular blanks; Flattening can bodies · CPC title

• B21D22/28

  of cylindrical articles using consecutive dies · CPC title

• B21D37/10

  Die sets; Pillar guides · CPC title

• B21D51/2692

  Manipulating, e.g. feeding and positioning devices; Control systems · CPC title

• B30B1/14

  operated by cams, eccentrics, or cranks · CPC title