Machine element or mechanism – Elements – Eccentric
Reexamination Certificate
2001-03-20
2002-12-17
Butler, Douglas C. (Department: 3683)
Machine element or mechanism
Elements
Eccentric
C074S571100, C074S600000, C100S257000, C100S102000
Reexamination Certificate
active
06494116
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a slide stroke adjusting device equipped to minimize the vibration in the rotation system of a press machine.
2. Description of the Related Art
A conventional device for adjusting the stroke of a slide for a press machine is disclosed in Japanese laid-open Utility Model Publication 7-26099.
Referring now to
FIGS. 4A and 4B
, showing a large end of a connecting rod
11
of a press machine (not shown). A small end of connecting rod
11
is connected with a slide of the press machine (not shown).
A liner
11
A is affixed on the inside of the large end part of connecting rod
11
. An eccentric bushing
2
is slidably and rotatably connected through liner
11
A to connecting rod
11
. An eccentric part
1
A, of an eccentric shaft
1
, connects and joins by an interference fit to eccentric bushing
2
. A groove
5
is provided on one side of eccentric bushing
2
. Groove
5
receives a fixing rod
6
movable in parallel with the axial direction of eccentric shaft
1
. In other words, groove
5
and fixing rod
6
act as a fixing means to fix eccentric bushing
2
relative to connecting rod
11
.
An internal gear and a hub
3
are positioned on eccentric bushing
2
opposite groove
5
. Internal gear is affixed to eccentric bushing
2
. Hub
3
is movable in an axial direction about eccentric shaft
1
. A teeth space
7
A, is formed on the outer perimeter surface of hub
3
. Teeth space
7
A meshes with inner teeth (not shown) of internal gear
7
. Further, a collar
9
formed on eccentric shaft
1
. Collar
9
acts to restrict the movement o hub
3
away from internal gear
7
and eccentric bushing
2
.
A coupling body
10
is movable in the axial direction of eccentric shaft
1
, away from hub
3
. Coupling body
10
contacts and pushes the side surface of hub
3
, to mesh the teeth (not shown) formed on the outer perimeter surface of hub
3
, with the inner teeth (not show n) of internal gear
7
.
An oil passage
4
, through eccentric shaft
1
helps release the interference fit of eccentric part
1
A with eccentric bushing
2
. Pressurized oil, provided through oil passage
4
to an opening (not shown), contacts the inner surface of eccentric bushing
2
. A packing
2
A and a packing
2
B are formed about the outer perimeter surface of eccentric part
1
A where eccentric part
1
A joins eccentric bushing
2
. Under some conventional constructions, packing
2
A and packing
2
B are omitted.
A packing
3
A and
3
B are positioned on the inner perimeter surfaces of hub
3
where hub
3
contacts the outer perimeters of eccentric part
1
A and eccentric shaft
1
. An oil passage
8
, is formed through eccentric shaft
1
to a surface of eccentric part
1
A opposite hub
3
. Oil passage
8
allows the passage of pressurized oil to urge hub
3
outward away from eccentric part
1
A.
During stroke adjustment operations, fixing rod
6
is placed in groove
5
, to fix the rotation of eccentric bushing
2
. Pressurized oil next passes through oil passage
8
. Hub
3
moves outward from eccentric part
1
A toward collar
9
. As a result, hub
3
no longer meshes with internal gear
7
. Pressurized oil then passes through oil passage
4
. Eccentric bushing
2
is partially elastically deformed. As a result, the interference fit of eccentric part
1
A is released, and eccentric shaft
1
rotates to adjust the amount of eccentricity relative to eccentric bushing
2
.
Referring to
FIG. 4B
, the top-dead center position places an eccentricity P, of eccentric part
1
A with respect to eccentric shaft
1
, in the position shown. The top-dead center position further places an eccentricity Q, of eccentric bushing
2
with respect to eccentric part
1
A, in the position shown. Thus, a maximum stroke length is 2×(P+Q). Further, a minimum stroke length is 2×(Q−P).
After stroke adjustment, pressurized oil in oil passage
4
and oil passage
8
is released. The shape of eccentric bushing
2
is elastically reformed. The interference fit with eccentric part
1
A re-engages. Coupling body
10
presses against hub
3
and meshes the outer perimeter teeth of hub
3
to the inner teeth of internal gear
7
. Fixing rod
6
is withdrawn from groove
5
, and coupling body
10
is withdrawn from hub
3
and placed on standby in a non-interfering area.
Using the described stroke adjustment process, the stroke of connecting rod
11
is adjusted. The stroke adjustment conforms to the pitch of the inner teeth of internal gear
7
. Contact provided by meshing internal gear
7
with hub
3
, transfers torque from eccentric part
1
A to eccentric bushing
2
. Torque is then transferred from eccentric bushing
2
to connecting rod
11
.
Negative results arise when using the above type of conventional stroke adjustment. Under rapid stroke rate, or an increasing stroke rate, the multiple eccentric members rotate rapidly. Thus, internal centrifugal and centripetal forces result in vibration, heat, wear, shorter equipment life span, and increased maintenance costs and operation down-time.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of the invention to provide a stroke adjustment device for a press machine.
It is another object of the invention to provide a stroke adjustment device that minimizes the unbalance and vibration resulting from the rotation of conventional stroke adjusting devices.
It is another object of the invention to provide a stroke adjustment device that is adaptable to vary stroke adjustment positions.
It is another object of the present invention to provide a stroke adjustment device that both minimizes vibration from a press machine and adjusts simultaneously to stroke adjustments of the press machine.
It is another object of the present invention to provide a stroke adjustment device that is adaptable to a range of rotary systems requiring stroke adjustment and vibratory dampening.
Briefly stated, the present invention relates to a stroke adjusting device for removing instability in a mechanical rotation system. The stroke adjusting device includes an adjustable rotation balancing weight attached to an eccentric bushing positioned about an eccentric shaft. The adjustable rotation balancing weight contains a weight portion adaptable to counteract the instability of the eccentric mechanical rotation system thus minimizing vibration. A hydraulic system enables simple adjustment of the stroke adjusting device.
According to an embodiment of the present invention, there is provided a stroke adjusting rotation balancing device, comprising: an eccentric shaft portion, the eccentric shaft portion receiving a vibration from an external mechanical system, a rotation balancing eccentric bushing affixed about a first part of the eccentric shaft portion, a rotation balancing weight adjustably joined to the eccentric bushing, means for fixing the rotation balancing weight relative to the eccentric bushing, and means for adjusting the rotation balancing weight relative to the eccentric bushing and the eccentric shaft whereby the rotation balancing weight counteracts and dampens the vibration from the external mechanical system.
According to an embodiment of the present invention, there is provided a stroke adjusting and rotation balancing device, wherein: the means for adjusting includes a hydraulic circuit, and the hydraulic circuit supplying a hydraulic pressure to the eccentric bushing and the rotation balancing weight thereby allowing adjustment of the rotation balancing weight relative to the eccentric bushing to dampen the vibration.
According to an embodiment of the present invention, there is provided a stroke adjusting and rotation balancing device, wherein: the means for fixing includes a groove, the groove formed in the rotating balancing weight, the means for fixing further includes a fixing rod, the fixing rod extending from a fixed external position, and the fixing rod formed to fit into the groove, whereby the rotation balancing weight is prevented from rotation relative to the eccentr
Aida Engineering Co., Ltd.
Butler Douglas C.
Darby & Darby
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