JPH066383B2 - Drive - Google Patents

Description

TECHNICAL FIELD The present invention relates to a drive device, and more particularly to a drive device that can be used as drive means for a device that linearly moves a shaft having a minute diameter in a minute range.

[Conventional technology]

Conventionally, this type of drive device has not been provided with a cushioning material for leaf springs and a vibration isolator for a housing.

[Problems to be solved by the invention]

In the above-described conventional drive device, since the leaf spring is not buffered and the housing is not quake-proof, when the flight pin head is caused to fly by the extension force of the piezoelectric element, the returned flight pin head collides with the piezoelectric element and rebounds. Therefore, the responsiveness of flying the flight pin head cannot be increased. In addition, there is a problem in that the expansion force of the piezoelectric element often vibrates the housing and hinders drive control.

[Means for solving problems]

The drive device of the present invention includes a piezoelectric element that generates an extension force in the axial direction when a voltage is applied, a flight pin head that flies by the extension force of the piezoelectric element, a pin that is integral with the flight pin head, and the flight pin head. A leaf spring that holds the pin and returns to the original position when the extension force disappears, a housing that holds the piezoelectric element and the leaf spring, and an upper end and one side surface are fixed to both inner surfaces of the housing,
The lower end is provided with a plurality of elastic bodies that are pressed against and contact the upper surface of the leaf spring.

[Action]

By installing multiple elastic bodies, one end of which is fixed to both sides of the inner surface of the housing and the other end of which is pressed against the leaf spring while allowing it to flex, it becomes a buffer for the flight pin head when flying and rebounds. Can be quickly stopped, and the flight response of the flight pin head can be speeded up. Further, since one end of the elastic body is fixed to a wide range of the inner surface of the housing, there is a vibration removing effect of the housing, and it is possible to eliminate a hindrance to drive control.

〔Example〕

 Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side view showing an embodiment of the present invention, and FIG.
It is an operation | movement figure which shows the state which the flight pin head in a figure is flying.

In FIGS. 1 and 2, the piezoelectric element 2 has its upper end fixed to the housing 1, and when a voltage is applied from the control unit 3, the piezoelectric element 2 expands in the axial direction to generate an expansion force. In this embodiment, since the upper end is fixed, the extension force acts downward. When no voltage is applied to the piezoelectric element 2, the spherical head of the flight pin head 4 made of a material having high hardness and high repulsive force is applied to the lower end of the piezoelectric element 2 as shown in FIG. It is fixed to a leaf spring 5 whose both sides are fixed to the housing 1 so as to be in contact with each other. The pin 6 is fixed to the leaf spring 5 integrally with the flight pin head 4. The rubber plates 7 and 8 fix the upper end and the side face to the inner surface of the housing 1, and the lower end is in contact with the upper surface of the leaf spring 5 under pressure from the leaf spring 5.

Next, the operation of this embodiment will be described.

When a voltage is applied from the control unit 3 to the piezoelectric element 2, the piezoelectric element 2 extends downward at high speed and repels the flight pin head 4, so that the flight pin head 4 flies downward. At this time, as shown in FIG. 2, the lower ends of the rubber plates 7 and 8 are separated from the plate spring 5 because the plate spring 5 is no longer pressed. After that, when the flight pin head 4 reaches the lowest point, it is returned to its original position by the restoring force of the leaf spring 5, but before the head of the flight pin head 4 collides with the lower end of the piezoelectric element 2, the upper surface of the leaf spring 5 is reached. Comes into contact with the lower ends of the rubber plates 7 and 8 and is thus buffered. After that, the head of the flight pin head 4 collides with the lower end of the piezoelectric element 2 and rebounds. However, since the leaf spring 5 has already been buffered, the rebound ends rapidly and the flight pin head 4 comes to rest and returns to its initial state.

In this embodiment, since the leaf springs 5 are buffered by the rubber plates 7 and 8 fixed to the inner surface of the casing 1, the rebound end time of the flight pin head without the rubber plate is reduced.
The flight pin head 4 can be stopped in about 1/3.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY As described above, the present invention has the effect of significantly shortening the rebound end time of the flight pin head by cushioning the leaf springs with a plurality of elastic bodies fixed to the inner surface of the housing, and also the vibration removal of the housing Since it is performed, the influence of vibration is eliminated, and the piezoelectric element can be easily controlled. Therefore, there is an effect that it can be applied as an actuator for a high-speed micro-drilling device and a print head of a high-speed printer.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a driving device of the present invention, and FIG. 2 is an operation diagram showing a state in which the flight pin head in FIG. 1 is flying. DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Piezoelectric element, 3 ... Control part, 4 ... Flight pin head, 5 ... Leaf spring, 6 ... Pin, 7, 8 ... Rubber plate.

Claims (1)

[Claims] 1. A piezoelectric element that generates an extension force in the axial direction when a voltage is applied, a flight pin head that flies by the extension force of the piezoelectric element, a pin integrated with the flight pin head, the flight pin head and the pin. A leaf spring that returns to its original position when the extension force disappears, and a casing that holds the piezoelectric element and the leaf spring. A driving device comprising a plurality of elastic bodies having a fixed side surface and a lower end which is in contact with the upper surface of the leaf spring under pressure.