Actuator with variable speed servo motor for redraw assembly

Patent metadata

Field	Value
Publication number	US-9352375-B2
Application number	US-201314023491-A
Country	US
Kind code	B2
Filing date	Sep 11, 2013
Priority date	Sep 11, 2013
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

An actuator for a redraw sleeve that operates independently of the ram drive mechanism is provided. The actuator utilizes an eccentric journal coupled to a drive shaft of a servomotor. The servomotor is structured to provide its output shaft with a variable rotation speed so as to accommodate the need for the redraw sleeve to be in selected locations at specific times. Further, the redraw sleeve includes a collapsing redraw cylinder to allow the redraw sleeve to dwell in a forward position.

First claim

What is claimed is:

1. An actuator assembly for a redraw assembly comprising:
a servomotor including a rotating output shaft
an eccentric journal assembly, said eccentric journal assembly coupled to said servomotor output shaft;
a connecting rod assembly including a connecting rod, said connecting rod coupled to said eccentric journal assembly;
wherein rotation of said servomotor output shaft causes said eccentric journal assembly to rotate between at least a first, rearward position and a second, forward position;
wherein said connecting rod moves between a first, rearward position and a second, forward position corresponding to said eccentric journal assembly first and second positions;
wherein said connecting rod is structured to be coupled to a movable redraw sleeve;
said eccentric journal assembly includes a shaft and an eccentric journal;
said eccentric journal assembly shaft having an axis of rotation;
said eccentric journal being substantially circular;
wherein eccentric journal is coupled to said eccentric journal assembly shaft with the center of said eccentric journal spaced from said eccentric journal assembly shaft axis of rotation;
said connecting rod has a first end and a second end;
said connecting rod first end includes a bearing assembly, said connecting rod first end bearing assembly structured to engage said eccentric journal;
said connecting rod second end structured to be coupled to a movable redraw sleeve;
said connecting rod second end includes a rotational coupling;
said connecting rod assembly includes an oscillating shaft assembly;
said oscillating shaft assembly including a pivot shaft, a drive arm, a pivot arm assembly, and a base;
said pivot shaft rotatably coupled to said base;
said drive arm including a first, proximal end and a second, distal end, said drive arm second, distal end having a rotational coupling;
said drive arm first end coupled to said pivot shaft;
said drive arm second end rotational coupling is rotatably coupled to said connecting rod second end rotational coupling;
said pivot arm assembly including at least a first elongated pivot arm, said first pivot arm having a first end and a second end;
said first pivot arm first end fixed to said pivot shaft;
said first pivot arm second end including a rotational coupling; and
said first pivot arm second end rotational coupling structured to be coupled to a movable redraw sleeve.

2. The actuator assembly of claim 1 wherein:
said pivot arm assembly includes a second elongated pivot arm, said second pivot arm having a first end and a second end;
said second pivot arm first end fixed to said pivot shaft at a location spaced from said first pivot arm, said first and second pivot arms extending substantially parallel to each other;
said second pivot arm second end including a rotational coupling; and
said second pivot arm second end rotational coupling structured to be coupled to a movable redraw sleeve.

3. A redraw assembly comprising:
a movable redraw sleeve;
a redraw die;
said movable redraw sleeve structured to move between a first position, wherein said movable redraw sleeve is spaced from said redraw die, and a second position, wherein said movable redraw sleeve is disposed immediately adjacent said redraw die;
an actuator assembly for a redraw assembly including a servomotor, an eccentric journal assembly, and a connecting rod assembly;
said servomotor including a rotating output shaft;
said eccentric journal assembly coupled to said servomotor output shaft;
said connecting rod assembly including a connecting rod, said connecting rod coupled to said eccentric journal assembly;
wherein rotation of said servomotor output shaft causes said eccentric journal assembly to rotate between at least a first, rearward position and a second, forward position;
wherein said connecting rod moves between a first, rearward position and a second, forward position corresponding to said eccentric journal assembly first and second positions;
wherein said connecting rod is coupled to said movable redraw sleeve;
said eccentric journal assembly includes a shaft and an eccentric journal;
said eccentric journal assembly shaft having an axis of rotation;
said eccentric journal being substantially circular;
wherein said eccentric journal is coupled to said eccentric journal assembly shaft with the center of said eccentric journal spaced from said eccentric journal assembly shaft axis of rotation;
said connecting rod has a first end and a second end;
said connecting rod first end includes a bearing assembly, said connecting rod first end bearing assembly structured to engage said eccentric journal;
said connecting rod second end is coupled to said movable redraw sleeve;
said connecting rod second end includes a rotational coupling;
said connecting rod assembly includes an oscillating shaft assembly;
said oscillating shaft assembly including a pivot shaft, a drive arm, a pivot arm assembly, and a base;
said pivot shaft rotatably coupled to said base;
said drive arm including a first, proximal end and a second, distal end, said drive arm second, distal end having a rotational coupling;
said drive arm first end coupled to said pivot shaft;
said drive arm second end rotational coupling is rotatably coupled to said connecting rod second end rotational coupling;
said pivot arm assembly including at least a first elongated pivot arm, said first pivot arm having a first end and a second end;
said first pivot arm first end fixed to said pivot shaft;
said first pivot arm second end including a rotational coupling; and
said first pivot arm second end rotational coupling structured to be coupled to a movable redraw sleeve.

4. The redraw assembly of claim 3 wherein:
said pivot arm assembly includes a second elongated pivot arm, said second pivot arm having a first end and a second end;
said second pivot arm first end fixed to said pivot shaft at a location spaced from said first pivot arm, said first and second pivot arms extending substantially parallel to each other;
said second pivot arm second end including a rotational coupling; and
said second pivot arm second end rotational coupling is coupled to said movable redraw sleeve.

5. A redraw assembly comprising:
a movable redraw sleeve;
a redraw die;
said movable redraw sleeve structured to move between a first position, wherein said movable redraw sleeve is spaced from said redraw die, and a second position, wherein said movable redraw sleeve is disposed immediately adjacent said redraw die;
an actuator assembly for a redraw assembly including a servomotor, an eccentric journal assembly, and a connecting rod assembly;
said servomotor including a rotating output shaft;
said eccentric journal assembly coupled to said servomotor output shaft;
said connecting rod assembly including a connecting rod, said connecting rod coupled to said eccentric journal assembly;
wherein rotation of said servomotor output shaft causes said eccentric journal assembly to rotate between at least a first, rearward position and a second, forward position;
wherein said connecting rod moves between a first, rearward position and a second, forward position corresponding to said eccentric journal assembly first and second positions;
wherein said connecting rod is coupled to said movable redraw sleeve;
said movable redraw sleeve includes a stationary slide housing and a collapsing redraw cylinder;
said collapsing redraw cylinder movably coupled to said stationary slide housing and structured to move between a first, retracted position and a second, extended position; and
said collapsing redraw cylinder structured to change between a first elongated configuration and a second collapsed configuration.

6. The redraw

Assignees

• Stolle Machinery Co Llc

Inventors

• Haulsee Donald Ray

Classifications

• B21D22/28 Primary

  of cylindrical articles using consecutive dies · CPC title

• B30B1/268

  using a toggle connection between driveshaft and press ram · CPC title

• B30B1/06

  operated by cams, eccentrics, or cranks · CPC title

• B21D51/26

  cans or tins; Closing same in a permanent manner (making outlet arrangements B21D51/38; welding or soldering B23K) · CPC title

• B21D24/08

  Pneumatically or hydraulically loaded blank holders · CPC title