Machine element or mechanism – Gearing
Reexamination Certificate
2000-02-03
2001-11-20
Marmor, Charles A (Department: 3681)
Machine element or mechanism
Gearing
Reexamination Certificate
active
06318210
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a phase regulating apparatus for performing phase regulation between rotary bodies rotatingly driven by the same driving motor.
BACKGROUND ART
In a drive system for a printing roll or the like, it is possibly required to perform phase regulation between two rolls rotatingly driven by the same driving motor. Therefore, the applicant has proposed a phase regulating apparatus having a construction shown in
FIG. 5
, for example.
A phase regulating apparatus
1
shown in
FIG. 5
performs phase regulation between printing rolls
2
and
3
rotatingly driven by the sa driving motor
4
. The roll
2
is directly driven by the driving motor
4
. The roll
3
is driven by the driving motor via a rotating force transmission path constituted of a gear train and a phase regulating speed reducer
5
. The phase regulating speed reducer
5
is driven by a phase regulating motor
6
.
The phase regulating speed reducer
5
is a differential gear unit, as which a wave gear drive is employed here. The phase regulating speed reducer
5
is constructed with annular rigid internal gears
51
and
52
arranged in parallel in coaxial condition, an annular flexible external gear
53
arranged at inside of the annular rigid internal gears, and a wave generator
54
engaged therein. The wave generator
54
has an elliptically shaped contour. By the wave generator, the flexible external gear
53
is deflected into an elliptic shaped configuration. Both end portions in major axis direction thereof are engaged with the rigid internal gears
51
and
52
. When the wave generator
54
is rotated, the meshing positions are moved in circumferential direction.
Here, the number of teeth of the flexible external gear
53
and that of teeth of the rigid internal gear
51
are the same. In contrast to this, the number of teeth of the other rigid internal gear
52
is greater than those of the flexible external gear
53
and the rigid internal gear
51
by two. Therefore, when the wave generator
54
is driven to rotate and whereby the meshing points between the flexible external gear
53
and the rigid internal gears
51
and
52
are moved in circumferential direction, no relative rotation is caused between the flexible external gear
53
and the rigid internal gear
51
having the same number of gear teeth, whereas the other rigid internal gear
52
causes relative rotation with respect to these gears
53
and
51
. As a result, a high speed rotation input to the wave generator
54
can be output with significant reduction depending upon a difference of number of gear teeth of the gears
52
and
53
from the rigid internal gear
51
or
52
. The speed reducer of this type have been disclosed in U.S. Pat. No. 4,974,470.
In the phase regulating speed reducer
5
of this construction, the wave generator
54
is driven by a phase regulating motor
6
. On the other hand, a gear
7
is rigidly fixed on the outer periphery of the rigid internal gear
51
. This gear
7
is meshed with a gear
8
mounted on a rotary shaft
2
a
of the roll
2
. Also, on the outer periphery of the other rigid internal gear
52
, a gear
9
is rigidly fixed. The gear
9
is meshed with a gear
11
mounted on a rotary shaft
3
a
of the roll
3
.
In the phase regulating apparatus
1
, the phase regulating motor
6
is not driven for applying brake in normal operation. The roll
2
is driven by the driving motor
4
. On the other hand, the roll
3
is driven by the driving motor
4
via gear trains
9
and
11
and via a transmission path reaching from the rotary shaft
2
a
of the roll
2
to the rotary shaft
3
a
of the roll
3
through gear trains
8
and
7
, a phase regulating speed reducer
5
and the gear trains
9
and
11
.
Next, at occurrence of necessity of phase adjustment for the roll
3
relative to the roll
2
, the phase regulating speed reducer
5
is driven by the phase regulating motor
6
.
As set forth above, conventionally, the wave gear drive is utilized as the phase regulating speed reducer for driving the speed reducer upon phase regulation to transmit rotation of the driving motor to the roll
3
side with slightly acceleration or deceleration for adjusting the phases between the rolls
2
and
3
. On the other hand, when phase regulation is not necessary, a rotational force of the driving motor is transmitted to the roll
3
side via the speed reducer.
Here, in the conventional phase regulating apparatus, the speed reducer
5
is active even in normal operation to effect speed reducing operation. Accordingly, by appropriately setting number of gear teeth of the gear trains
8
and
7
on input side and gear trains
9
and
11
on output side, speed reducing operation of the speed reducer
5
is canceled.
DISCLOSURE OF THE INVENTION
An object of the present invention is to propose a phase regulating apparatus, in which a ratio of input and output rotation speeds is one to one.
On the other hand, an object of the present invention is to propose a phase regulating apparatus which achieves high precision of rotational angle transmission and can be manufactured at low cost, employing a novel phase regulating speed reducer.
In order to accomplish the above-mentioned object, the present invention is characterized by the following feature in a phase regulating speed reducer arranged in a rotational force transmission path between first and second rotary bodies, and being driven by a phase regulating motor for performing phase regulation of the first and second rotary bodies.
Namely, the phase regulating speed reducer has first and second wave gear drives arranged in parallel relationship with each other in coaxial condition relative to each other.
The first wave gear drive includes an annular first rigid internal gear, a cup-shaped first flexible external gear arranged inside of the first rigid internal gear, and a wave generator arranged inside of the first flexible external gear, deforming the first flexible external gear in a radial direction for partially meshing with the first rigid internal gear, and the first wave generator being coupled with a phase regulating motor.
On the other hand, the second wave gear drive includes an annular second rigid internal gear, a cup-shaped second flexible external gear arranged inside of the second rigid internal gear, and a wave generator arranged inside of the second flexible external gear, deforming the second flexible external gear in a radial direction for partially meshing with the second rigid internal gear, and the second wave generator being coupled with a phase regulating motor, the second flexible external gear being fixed with the first flexible external gear in back-to-back relationship for integral rotation, and the second wave generator being fixed in a non-rotatable state.
Also, at least one of the first and second rigid internal gear is input a rotation, and a rotational output is obtained from the other gear.
Here, the first and second flexible external gears are produced as an integral product.
On the other hand, as the first and second wave gear drives, the flexible external gear unit may be a silk hat type flexible external gear whose diaphragm portion is extended outward, in place of the cup-shaped flexible external gear unit.
Next, the present invention is characterized in the following constructions in a phase, regulating apparatus for performing phase regulation of first and second rotary bodies driven to rotation by the same driving motor, having a phase regulating speed reducer disposed in a rotational force transmission path from the driving motor to the second rotary body, and upon phase regulation, the phase regulating speed reducer being driven by a phase regulating motor
Namely, the phase regulating speed reducer has first and second wave gear drives arranged in parallel relationship in coaxial state.
The first wave gear drive includes an annular first rigid internal gear, a cup-shaped first flexible external gear arranged inside of the first rigid internal gear, and a wave generator arranged inside o
Burns Doane Swecker & Mathis L.L.P.
Harmonic Drive Systems Inc.
Marmor Charles A
Parekh Ankur
LandOfFree
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