Machine element or mechanism – Mechanical movements – Reciprocating to reciprocating
Patent
1997-01-24
1999-07-13
Marmor, Charles A.
Machine element or mechanism
Mechanical movements
Reciprocating to reciprocating
30 4392, 310 20, B26B 1928
Patent
active
059211342
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a vibratory linear actuator employing a reciprocating motor which electromagnetically drives a plurality of movable components at the same frequency and at opposite phases with respect to a stationary component.
DESCRIPTION OF THE PRIOR ART
A conventional vibratory linear actuator, for example, German Patent Publication No. 1151307, is known. In this conventional example, a plurality of movable components are supported on a stationary component by spring members. The movable components are electromagnetically vibrated reciprocatingly (i.e., in alternating directions) at the same frequency and at opposite phases so as to attenuate the whole vibration by superposing vibrations of opposite phases to each other.
However, this vibratory linear actuator is basically a spring vibration system, and is not stable against an external disturbance. If an external force is applied to any of the movable components, for example, where a linearly oscillating actuator is used in an electric shaver, the amplitude of the movable components applied with a load fluctuates transiently. This upsets the balance with the other movable components, which produces uncomfortable vibrations to an user.
SUMMARY OF THE INVENTION
The present invention has bees developed in view of the above-described problem of the conventional example. An object of the present invention is therefore to provide a vibratory linear actuator which does not generate uncomfortable vibrations without destroying the balance with the other movable component during the normal drive, even when an external force is applied to any one of the movable components, and a method of driving the same.
In order to achieve the afore-mentioned object, according to the present invention, the movable components adapted to be electromagnetically driven reciprocatingly at the same frequency and at phases opposite to each other are mechanically linked with each other so that the vibration of one movable component can be transmitted to the other movable component with the direction of oscillation being inverted, thus to mechanically insure the opposite phase relation of both movable components. More specifically, when an external force is applied to a movable component and the oscillating state is changed, since the change in the oscillating state is transmitted to the other component in the state where the direction of such change is inverted, the opposite phase relation between movable components is maintained. Thus, the balance of the vibration is secured.
Furthermore, when a whole oscillating system including movable components set in the opposite phase relation is considered, since both phases are equal in the absolute value or in a proportional relation, the center of amplitude of the vibrating system remains unchanged and the whole oscillation is stabilized.
As a mechanism for linking both movable components so as to maintain opposite phase relation to each other, various mechanisms may be considered. For example, both movable components may be liked with each other via a link rotatably supported on a fixed axle.
And it is desirable that the support point of the link and the connection points of the link with respective movable components are positioned on the same line.
It is also desirable that the ratio of respective distances between the link support point and the connection points of respective movable components with the link is nearly equal to the ratio of amplitude amounts of both movable components under the state where no link is attached.
Furthermore, it is desirable that the ratio of the distances between the link support point and the connection points of respective movable components with the link is nearly equal to the inverse mass ratio of both movable components.
It is also desirable that the connection points of the link with respective movable components are constituted by axles and long holes wherein said axles are inserted. Furthermore, it is desirable that the lengthwise edge of said long hol
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Ootsuka Kiyotaka
Shiba Takeshi
Tanahashi Masao
Fenstermacher David
Marmor Charles A.
Matsushita Electric & Works Ltd.
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