JPH05122951A - Driving mechanism - Google Patents

Abstract

PURPOSE:To provide a driving mechanism wherein compactness of a device can be contrived and also the cost down can be contrived by decreasing a number of components. CONSTITUTION:A driving mechanism provides a base mount 5 of loading a mover 6, extensible/contractible vibration generating member 7 with its one end fixed to this base mount 5 and a vibrating member 10 formed with a fixed piece 8 connected to the other end of this vibration general member 7 to extend parallelly thereto by fixing one end of the piece 8 to the base mount and with a vibrating piece 9 fold back-extended from this fixed piece 8 to come into pressure contact with the mover 6 on the base mount 5 in accordance with driving of the vibration generating member 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive mechanism used as a paper feed mechanism, a belt feed mechanism, a linear traveling mechanism, etc., which utilizes ultrasonic vibration generated by an ultrasonic motor.

[0002]

2. Description of the Related Art Conventionally, as a drive mechanism using an ultrasonic motor as an actuator, for example, Japanese Patent Laid-Open No. 55-1250.
There is one disclosed in Japanese Patent No. 52 as "motor device utilizing ultrasonic vibration". FIG. 8 shows the driving principle. In this case, one end of the ultrasonic transducer 2 is fixed to each of the left and right bases 1, and a plate-shaped vibrating piece 3 having a predetermined angle is attached to the other end. The vibrating pieces 3 face each other, and both of them are in contact with the moving body 4 (for example, the rotating body 4 here). In such a configuration, by exciting both ultrasonic transducers 2 now,
A reciprocating motion occurs in the vibrating piece 3 at one end thereof. This reciprocating motion is transmitted to the rotating body 4, whereby it can be converted into a rotating motion and the output thereof can be taken out.

[0003]

In the case of the above-mentioned example, since the vibrating piece 3 which is the vibrating member and the ultrasonic transducer 2 which is the vibration generating member are arranged in series, the lateral direction as a whole is obtained. It becomes a very long, so-called long structure. Further, in this case, in order to always drive stably and improve the torque, it is attempted to drive the moving body 4 from both sides sandwiching it, but with such a structure, the number of parts is increased and the cost can be reduced. In addition, the overall size of the device becomes large, which is contrary to the present day when further downsizing is desired.

[0004]

According to a first aspect of the present invention, a base on which a moving body is mounted is provided, and an expandable and contractible vibration generating member having one end fixed to the base is provided. A fixing piece having one end fixed to the vibration generating member, extending in parallel with the vibration generating member, and connected to the other end of the vibration generating member, and the base piece in response to driving of the vibration generating member. A vibrating member on which a vibrating piece that comes into pressure contact with the moving body is formed.

According to a second aspect of the present invention, one end is fixed to the base, and vibration generating members that are expandable and contractable in opposite directions are provided on both sides of the base, and one end is fixed to the base. A fixed piece that extends in parallel with the vibration generating member and is connected to the other end of each of the vibration generating members, and a folding piece that extends from the fixed piece and extends from the opposite sides of the moving body in response to the driving of each of the vibration generating members. The vibrating member is provided with the vibrating reed that is pressed and brought into contact with each other.

According to the third aspect of the present invention, vibration generating members are provided which can expand and contract in opposite directions from the central portion, and the fixing pieces extend in parallel with the vibration generating members and are connected to both ends of the vibration generating members. And a vibrating member which is formed by folding back from the fixed piece and extending with the vibrating piece that comes into pressure contact with the moving body from both sides according to the driving of each of the vibrating members.

[0007]

According to the first aspect of the present invention, by vibrating the vibration generating member, the vibrating reed is brought into pressure contact with the moving body on the base to generate a friction driving force, thereby moving the moving body. Further, since the vibrating member is arranged in parallel with the vibration generating member and the vibrating piece is formed by folding back, the vibrating piece and the vibration generating member can be arranged in series as in the conventional case. This eliminates the need for a long structure and makes the device compact.

According to the second aspect of the present invention, by vibrating the two vibration generating members on the left and right sides, the moving body is moved from both sides by the vibrating pieces to generate the frictional driving force. In addition, since two vibrating members and two vibration generating members are disposed symmetrically on the left and right, the driving force can be doubled as compared with the invention according to claim 1, and at the same time, It becomes possible to make the device compact as compared with the conventional device having the same driving capability.

According to the third aspect of the present invention, by vibrating one vibration generating member, the moving body is moved from both sides by the vibrating pieces to generate the friction driving force. Further, since the vibration generating members for driving the left and right vibrating members are commonly used, it is possible to further simplify the device and reduce the cost as compared with the invention according to claim 2.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention described in claim 1 will be described with reference to FIGS. FIG. 1 shows a paper feed mechanism as an example of the drive mechanism. A paper 6 as a moving body is placed on the base 5. One end of a piezoelectric element 7 serving as a stretchable vibration generating member is fixed on the base 5. Further, on the base 5, there is provided a leaf spring 10 as a vibrating member having a U-shape including a fixed piece 8 and a vibrating piece 9. In this case, the fixing piece 8 has one end fixed to the base 5, extends in parallel with the piezoelectric element 7, and is fixed to the tip of the piezoelectric element 7. Further, the vibrating piece 9 is obliquely folded back and extends from the fixed piece 8 to the base 5 side, and is brought into pressure contact with the paper 6 on the base 5 according to the driving of the piezoelectric element 7. It is in a state of.

The basic operating principle of the vibrating piece 9 of the leaf spring 10 having such a structure will be described with reference to FIGS. First, in FIG. 2, (a) shows a state before driving the piezoelectric element 7. At this time, the resonator element 9 is in contact with the surface of the base 5. The position of the tip of the vibrating reed 9 that is in contact is defined as point P. Next, when the piezoelectric element 7 is rapidly driven, the piezoelectric element 7 expands as shown in (b), whereby the tip of the vibrating piece 9 moves away from the base 5 to the position of point Q. At this time, the vibrating piece 9 tries to move from the Q point to the R point position, as shown in (c), after the expansion of the piezoelectric element 7. Next, the piezoelectric element 7
Is returned to the original state, the vibrating piece 9 comes into contact with the base 5 and returns to the state of (a) again while being in pressure contact. At this time, the vibrating piece 9 moves on the substrate 5 from the R point and reaches the P point.

Further, FIG. 3 shows each locus of P, Q and R. In this way, since the tip portion, that is, the free end, of the vibrating piece 9 can draw a substantially circular motion, a part of the locus (R → P) is converted as the driving force in one direction and taken out, so that the paper 6 It is possible to realize a mechanism for transporting.

As described above, by vibrating the piezoelectric element 7 to bring the vibrating piece 9 into pressure contact with the paper 6 on the base 5,
It becomes possible to move the paper 6 by generating a friction driving force. Further, since the leaf spring 10 is arranged in parallel with the piezoelectric element 7 and the leaf spring 10 is formed by being folded back, the vibrating piece 3 and the ultrasonic transducer 2 (see FIG. 8) are different from the conventional ones. It is no longer arranged in series,
This makes it possible to eliminate the long structure and make the device compact.

Next, an embodiment of the invention described in claim 2 will be described with reference to FIGS. 4 and 5. The same parts as those in the invention according to claim 1 are designated by the same reference numerals.

Here, the above-described paper feed mechanism of FIG. 1 is arranged symmetrically. That is, the piezoelectric elements 7a and 7b are fixed symmetrically on both sides of the base 5.
Corresponding plate springs 10a and 10b are provided corresponding to the piezoelectric elements 7a and 7b. The leaf spring 10a is composed of a fixed piece 8a and a vibrating piece 9a.
Is composed of a fixed piece 8b and a vibrating piece 9b.

In the paper feeding mechanism having such a structure, the paper 6 is vibrated on both sides of the vibrating pieces 9a and 9b at the central portion.
It is in a state of being sandwiched by and being in pressure contact.
Also in the case of the present embodiment, by driving the piezoelectric elements 7a and 7b, the vibrating piece 9a moves along the locus (P → Q → R) shown in FIG.
→ P), and the vibrating piece 9b can be moved as shown in the opposite trajectory (P → S → T → P) in FIG. Therefore, the paper 6 has the vibrating pieces 9a, 9
It is sandwiched by b and brought into pressure contact, and a friction driving force can be generated by this, so that the paper 6 can be moved in the X direction. In addition, here, the leaf spring 10
Since two a and 10b and two piezoelectric elements 7a and 7b are symmetrically arranged, the driving force can be doubled as compared with the invention described in claim 1, and at the same time, The size can be further reduced as compared with the conventional device having the same driving capability.

Next, an embodiment of the invention described in claim 3 will be described with reference to FIGS. 6 and 7. The same parts as those in the invention according to claim 1 are designated by the same reference numerals.

Here, one piezoelectric element 7 is used, and two U-shaped leaf springs 10a and 10b are used symmetrically.
The base 5 is eliminated. This allows
By driving the piezoelectric element 7, similarly to the embodiment of the invention described in claim 2, by causing the vibrating pieces 9a and 9b to press and contact the paper 6 from both sides thereof, a friction driving force is generated. Thus, the paper 6 can be moved in the X direction. Further, here, since the number of the piezoelectric elements 7 that drive the leaf springs 10a and 10b arranged symmetrically is one, the piezoelectric elements 7 are commonly used. It is possible to reduce the cost.

[0019]

According to the present invention, a base on which a moving body is placed is provided, and an expandable and contractible vibration generating member having one end fixed to the base is provided. One end is fixed to the base. A fixed piece that extends in parallel with the vibration generating member and is connected to the other end of the vibration generating member; and a portion that is folded back from the fixed piece and extends and that moves on the base according to the driving of the vibration generating member. Since the vibrating member formed with the vibrating piece that comes into pressure contact with the body is provided, the vibrating member is arranged in parallel with the vibration generating member, and the vibrating piece is formed by being folded back. Since the vibration generating member and the vibration generating member are not arranged in series, the long structure can be eliminated and the device can be made compact.

According to a second aspect of the invention, one end is fixed to the base, and vibration generating members that are expandable and contractible in opposite directions are provided on both sides of the base, and one end is fixed to the base. A fixed piece that extends in parallel with the vibration generating member and is connected to the other end of each of the vibration generating members, and a folding piece that extends from the fixed piece and extends from the opposite sides of the moving body in response to the driving of each of the vibration generating members. Since the vibrating member formed with the vibrating reeds that are in contact with each other under pressure is provided, two vibrating members and two vibrating members are symmetrically arranged, so that the driving force is higher than that of the invention according to claim 1. It can be doubled and at the same time
The device can be made more compact than the conventional device having the same driving capability.

According to a third aspect of the present invention, there is provided a vibration generating member which is capable of expanding and contracting in opposite directions from the central portion, and the fixing piece extends in parallel with the vibration generating member and is connected to both ends of the vibration generating member. Since the vibrating member is provided with the vibrating piece which is folded back from the fixed piece and extends and comes into pressure contact with the movable body from both sides according to the driving of each of the vibrating members, the left and right vibrating members are provided. Since the vibration generating member for driving the motor is shared, it is possible to further simplify the device and reduce the cost as compared with the invention according to claim 2.

[Brief description of drawings]

FIG. 1 is a front view showing the shape of a paper feeding mechanism that is an embodiment of the invention described in claim 1. FIG.

FIG. 2 is a principle explanatory view showing a basic operation principle of a paper feeding mechanism.

FIG. 3 is a schematic diagram showing a locus of a tip portion of a vibrating piece of a leaf spring.

FIG. 4 is a front view showing the shape of a paper feeding mechanism that is an embodiment of the invention according to claim 2;

5 is a side view seen from the side parallel to the paper of FIG. 4. FIG.

FIG. 6 is a front view showing the shape of a paper feeding mechanism that is an embodiment of the invention according to claim 3;

FIG. 7 is a plan view seen from the side in the moving direction X of the paper in FIG.

FIG. 8 is a front view showing a motor device using ultrasonic vibration which is a conventional example.

[Explanation of symbols]

 5 base 6 moving body 7, 7a, 7b vibration generating member 8, 8a, 8b fixed piece 9, 9a, 9b vibrating piece 10, 10a, 10b vibrating member

Claims (3)

[Claims] 1. A base on which a moving body is placed, a stretchable vibration generating member having one end fixed to the base, and one end fixed to the base extending in parallel with the vibration generating member. A fixed piece connected to the other end of the vibration generating member, and a vibrating piece that is folded back from the fixed piece and extends to come into pressure contact with the moving body on the base according to the driving of the vibration generating member. A drive mechanism comprising a formed vibrating member. 2. A vibration generating member, one end of which is fixed to the base, and which is stretchable in opposite directions on both sides of the base, and one end of which is fixed to the base and extends in parallel with each of the vibration generating members. A fixed piece that is present and connected to the other end of each of the vibration generating members, and a vibrating piece that folds back from the fixed piece and extends to contact the movable body from both sides under pressure as the vibration generating members are driven. And a vibrating member on which is formed a driving mechanism. 3. A vibration generating member capable of expanding and contracting in opposite directions from a central portion, a fixing piece extending in parallel with the vibration generating member and connected to both ends of the vibration generating member, and folded back from the fixing piece. A driving mechanism comprising: a vibrating member formed with a vibrating piece that is extended and that presses the moving body from both sides according to the driving of each of the vibrating members to make pressure contact.