Actuator with variable speed servo motor for redraw assembly

Patent metadata

Field	Value
Publication number	US-11033946-B2
Application number	US-201916273270-A
Country	US
Kind code	B2
Filing date	Feb 12, 2019
Priority date	Sep 11, 2013
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

An actuator assembly for a redraw sleeve that operates independently of the ram drive mechanism is provided. The actuator assembly utilizes 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.

First claim

What is claimed is:

1. An actuator assembly for a redraw assembly, said actuator assembly comprising:
a servomotor including a rotating output shaft;
wherein said servomotor produces a selectable rotational speed in said servomotor output shaft;

an eccentric journal assembly, said eccentric journal assembly coupled to said servomotor output shaft;
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 eccentric journal assembly also rotates through an acceleration position and a deceleration position;
said acceleration position occurring just prior to said eccentric journal assembly's second, forward position;
said deceleration position occurring just prior to said eccentric journal assembly's first, rearward position;
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;

a connecting rod assembly including a connecting rod, said connecting rod coupled to said eccentric journal assembly;
wherein said connecting rod moves between a first, rearward position and a second, forward position, respectively, corresponding to said eccentric journal assembly first position and said eccentric journal assembly second position;
wherein said connecting rod is structured to be coupled to a movable redraw sleeve;

a movable redraw sleeve couple to said connecting rod;
said servomotor has a faster rotational speed when said eccentric journal assembly is moving between the first, rearward position and the second, forward position;
said servomotor has a slower rotational speed when said eccentric journal assembly is moving between the first, rearward position and the second, forward position;
wherein, said connecting rod moves at a faster speed when said eccentric journal assembly is moving between the first, rearward position and the second, forward position;
wherein, said connecting rod moves at a slower speed when said eccentric journal assembly is moving between the first, rearward position and the second, forward position;
wherein, said movable redraw sleeve moves at a faster speed when said eccentric journal assembly is moving between the first, rearward position and the second, forward position; and
wherein, said movable redraw sleeve moves at a slower speed when said eccentric journal assembly is moving between the first, rearward position and the second, forward position.

2. The actuator assembly of claim 1 wherein:
said servomotor has a maximum rotational speed of between about 700 rpm and 500 rpm; and
said servomotor has a minimum rotational speed of between about 250 rpm and 50 rpm.

3. The actuator assembly of claim 2 wherein:
said servomotor has a maximum rotational speed of about 540 rpm; and
said servomotor has a minimum rotational speed of about 125 rpm.

4. The actuator assembly of claim 1 wherein:
said servomotor has a faster rotational speed when said eccentric journal assembly is moving between the first, rearward position and the second, forward position; and
said servomotor has a slower rotational speed when said eccentric journal assembly is moving between the first, rearward position and the second, forward position.

5. An actuator assembly for a redraw assembly, said actuator assembly comprising:
a servomotor including a rotating output shaft;
wherein said servomotor produces a selectable rotational speed in said servomotor output shaft;

an eccentric journal assembly, said eccentric journal assembly coupled to said servomotor output shaft;
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 eccentric journal assembly also rotates through an acceleration position and a deceleration position;
said acceleration position occurring just prior to said eccentric journal assembly's second, forward position;
said deceleration position occurring just prior to said eccentric journal assembly's first, rearward position;
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; and
wherein said redraw sleeve is a collapsing redraw sleeve structured to change between a first elongated configuration and a second collapsed configuration.

6. The actuator assembly of claim 5 wherein:
said collapsing redraw sleeve includes a stationary slide housing and a collapsing redraw cylinder;
said collapsing redraw cylinder slidably disposed in the stationary slide housing; and
wherein said collapsing redraw cylinder is structured to move between a first, retracted position and a second, extended position.

7. 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;
said servomotor including a rotating output shaft;
said servomotor coupled to said redraw sleeve;
wherein said servomotor produces a selectable rotational speed in said servomotor output shaft;
an eccentric journal assembly, said eccentric journal assembly coupled to said servomotor output shaft;
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 eccentric journal assembly also rotates through an acceleration position and a deceleration position;
said acceleration position occurring just prior to said eccentric journal assembly's second, forward position;
said deceleration position occurring just prior to said eccentric journal assembly's first, rearward position;
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;
a connecting rod assembly including a connecting rod, said connecting rod coupled to said eccentric journal assembly;
wherein said connecting rod moves between a first, rearward position and a second, forward position, respectively, corresponding to said eccentric journal assembly first position and said eccentric journal assembly second position;
wherein said connecting rod is structured to be coupled to a movable redraw sleeve;
said movable redraw sleeve coupled to said connecting rod;
said servomotor has a faster rotational speed when said eccentric journal assembly is moving between the first, rearward position and the second, forward position;
said servomotor has a slower rotational speed when said eccentric journal assembly is moving between the first, rearward position and the second, forward position;
wherein, said connectin

Assignees

• Stolle Machinery Co Llc

Inventors

• Haulsee Donald Ray

Classifications

• B30B1/06

  operated by cams, eccentrics, or cranks · CPC title

• B21D22/28 Primary

  of cylindrical articles using consecutive dies · CPC title

• B21D51/26

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

• B30B1/268

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

• B21D24/08

  Pneumatically or hydraulically loaded blank holders · CPC title