JPH05116787A - Conveying device - Google Patents

Abstract

PURPOSE:To provide a conveying device which varies a conveying speed by conversion of reciprocating movement into rotational movement through a crank mechanism and besides realizes a conveying mechanism being much smaller than a conventional type. CONSTITUTION:A conveying device is provided with a rotation vibration type microactuator 6 driven by means of an electrostatic force, a displacement amplifying mechanism 7 amplifying displacement of rotational vibration, produced by the microactuator 6, to fetch it as reciprocating movement, and a crank mechanism 8 having a rotor 15 provided at a center with a crank shaft 14 to convert reciprocating movement enlarged and amplified by the displacement amplifying mechanism 7 into rotational movement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveying device used in a paper feeding device or the like.

[0002]

2. Description of the Related Art Conventionally, as a particularly small paper feeding device in a conveying device, a so-called ultrasonic motor in which a vibrating member is excited by a piezoelectric material is used, or a so-called supersonic device which is excited by an electrostatic force to generate an elliptic motion. In some cases, a paper feed mechanism is realized by using a sonic actuator. As an example of the former, for example, in the title "Development of paper card feeding device using flat plate ultrasonic motor", "Paper feeding mechanism / control circuit design of copier / optical printer and latest technological trend", ARICEPS Some have been disclosed. Therefore, this will now be described with reference to FIG. Figure 3
Considering the induced charge distribution of the longitudinal first-order mode (L mode) and the induced charge distribution of the bent eighth-order mode (B mode) as shown in (a), as shown in FIG. The piezoelectric ceramics 1 and 2 are bonded to the vibrating plate 3 as a vibrating member. That is, the L-mode piezoelectric ceramics 2 are adhered to the central portion where the induced charge distribution is the largest and the vibration displacement is the smallest, and the B-mode piezoelectric ceramics 1 are adhered to both ends in pairs according to the charge polarity. .. Further, a paper 5 (or a card) pressed by a roller 4 is placed on the vibration plate 3.

In such a structure, the driving portions (not shown) for driving the piezoelectric ceramics 1 and 2 are respectively 90 °.
Sine wave voltages having different phases are applied to excite the L mode and the B mode as shown in FIG. An elliptical motion in the same direction is formed on the diaphragm 3, and thus paper feeding can be realized. As described above, the two modes are combined to form an elliptical motion of the same direction displacement over the entire width direction of the diaphragm 3, thereby increasing the pressure contact area of the roller 4 and increasing the paper feeding force. be able to.

As an example of the latter, a common electrode (movable part) having a comb tooth portion and an individual electrode having a comb tooth portion facing the comb tooth portion of the common electrode via an air layer or a dielectric ( Fixed part), a voltage is applied between the common electrode and the individual electrodes, and the electrostatic force generated by this causes vibration in the vibrating member integrated with the common electrode, and this vibration is converted into an elliptical motion. There is a device that realizes a drive mechanism such as paper feeding by converting the moving member and bringing the moving member into contact with the generation region of the elliptic motion to give a driving force to the moving member.

[0005]

As described above, as a small-sized paper feeding device, the vibration plate 3 is excited by the piezoelectric ceramics 1 and 2 as in the former example, or the diaphragm is static as in the latter example. The elliptical motion is generated by exciting with electric power, but in any of these cases, the paper feed speed is limited by the excitation mode and cannot be varied. The degree of freedom of is limited as much as possible and its application range is narrow.

[0006]

According to a first aspect of the present invention, a rotary vibration type microactuator driven by electrostatic force is provided, and the displacement of the rotary vibration obtained by the microactuator is amplified and extracted as a reciprocating motion. A displacement amplification mechanism was provided, and a crank mechanism provided with a rotor having a crankshaft as a center for converting the reciprocating motion obtained by the amplification amplification by the displacement amplification mechanism into a rotary motion was provided.

According to a second aspect of the present invention, in the first aspect of the present invention, a groove is formed on the side surface of the rotor to keep the rotation direction constant, and a stopper claw for locking the groove is provided.

[0008]

According to the first aspect of the present invention, the displacement of the rotational vibration obtained by the microactuator is amplified by the displacement amplifying mechanism to be extracted as a reciprocating motion, and the reciprocating motion can be converted into the rotational motion by the crank mechanism. Therefore, it becomes possible to take out rotational movements more reliably in a microscopic world than the conventional transport device, and by arranging these rotational movements innumerably in a horizontal line, it is possible to realize a very small paper feed mechanism. Is possible.

According to the second aspect of the present invention, the rotation direction of the rotor can be controlled by restraining the rotation in one direction using the stopper pawl immediately after the start of the rotational movement of the crank mechanism by the rotor. Becomes

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an external shape when a paper feeding device is realized as a carrying device. This paper feeder is
A comb-shaped micro (μ) actuator 6 as a rotary vibration microactuator driven by electrostatic force, and a displacement amplification mechanism that amplifies the displacement of the rotary vibration obtained by the comb microactuator 6 and extracts it as a reciprocating motion. 7 and a crank mechanism 8 for converting the reciprocating motion obtained by the expansion amplification by the displacement amplifying mechanism 7 into the rotary motion.

In this case, the rotary vibration type comb-shaped microactuator 6 has a comb-shaped movable portion 9 formed on the outer peripheral side thereof along the circumferential direction, and an inner periphery of the comb-shaped movable portion 9. The spirally-wound beam 10 provided on the side is provided. The beam 10 is fixed to a Si substrate (not shown) only at its central portion, and the comb-tooth-shaped movable portion 9 and the beam 10 are in a floating shape. Further, the displacement amplification mechanism 7 includes the comb-teeth type micro actuator 6
There is provided a displacement magnifying arm 11 connected to and a displacement magnifying portion 12 having an arc shape. Further, the crank mechanism 8 has a rotor 1 having a connecting rod 13 connected to the displacement magnifying arm 11 at the displacement magnifying section 12 and a crank shaft 14 connected to the connecting rod 13 as a center.
And 5 are provided. A groove 16 is formed on the side surface of the rotor 15 for keeping the rotation direction X constant.

Further, a stopper claw 17 is provided at a position close to the rotor 15, and the stopper claw 17 is engaged with the groove 16 so that the rotor 15 is stopped.
The rotation direction X of can be regulated. The stopper pawl 17 is connected to a linear vibration type comb-teeth type micro (μ) actuator 18, whereby the position of the stopper pawl 17 is moved so as not to become a rotational resistance after the rotor 15 rotates. It is possible to cancel the work.

FIG. 2 shows the cross-sectional shape of the region of the rotor 15, and the mechanism is such that the paper 19 is fed by the conveying surface P under the force of the link portion of the connecting rod 13 joined to it.

The operation of the paper feeding device having such a structure will be described. When an electrostatic force acts on the comb-shaped movable portion 9 of the comb-shaped microactuator 6, the electrodes of the comb-shaped movable portion 9 having the concentric circles are pulled in or pushed out from each other to rotate clockwise or counterclockwise. Vibrate.
The amplitude of the vibration is expanded and expanded through the displacement expansion arm 11. The expansion of the amplitude is performed around the fulcrum a (link portion), and in consideration of the case where the lower surface of the fulcrum a comes in contact with the Si substrate (not shown), the contact portion is reduced in order to reduce the frictional force at the contact surface. Is dimple processed. The vibration magnified by the displacement magnifying arm 11 is converted into a linear motion, that is, a reciprocating motion in the displacement magnifying portion 12. This reciprocating motion is transmitted to the rotor 15 via the connecting rod 13 to be converted into a rotary motion. In this case, the rotor 15 is set to rotate once for each vibration frequency of the comb-tooth type microactuator 6 (that is, one reciprocation). Further, at the start of rotation of the rotor 15, the stopper claw 17 is engaged with the groove 16 on the side surface of the rotor 15, so that the rotation direction thereof is restricted to one direction, whereby the rotor 15 rotates in the rotation direction X. start. After the rotation, the stopper claw 17 is moved to the unlocked position by the comb-shaped microactuator 18 and stands by.

The rotational movement in one direction X of the rotor 15 obtained in this way makes it possible to convey the paper 19 abutting on the conveyance surface P in one direction Y, whereby the paper feeding device is operated. Can be realized. And in this case,
Since the moving speed of the paper can be delicately changed as compared with the conventional micro paper feeder, it is possible to make it effective for dot alignment.

[0016]

According to the invention of claim 1, a rotary vibration type microactuator driven by electrostatic force is provided,
A displacement amplification mechanism that amplifies the displacement of rotational vibration obtained by this microactuator and extracts it as a reciprocating motion is provided, and has a crankshaft as the center that converts the reciprocating motion obtained by expanding and amplifying by this displacement amplifying mechanism into a rotational motion. Since the crank mechanism equipped with the rotor is provided, it is possible to take out the rotational motion more reliably in the microscopic world than the conventional transport device, and by arranging the rotational motion innumerably in a horizontal line, it is possible to make it extremely small. The paper feed mechanism can be realized, and the moving speed of paper feed can be changed as compared with the conventional minute paper feed device, which can be effective for dot alignment. The application range of the device can be expanded.

According to a second aspect of the invention, in the first aspect of the invention, a groove is formed on the side surface of the rotor to keep the rotation direction constant, and stopper claws that engage with the groove are provided. Immediately after starting the rotational movement of the rotor of the mechanism, the stopper claws can be used to suppress the rotation in one direction, so that the rotational direction of the rotor can be reliably controlled.

[Brief description of drawings]

FIG. 1 is a configuration diagram illustrating an overall configuration of a paper feeding device that is an embodiment of the present invention.

FIG. 2 is a sectional view showing a sectional shape of a rotor portion.

FIG. 3 shows a conventional example, in which (a) shows an induced charge distribution in a longitudinal first-order mode (L mode) and a bending eighth-order mode (B).
(B) is a side view showing the overall configuration of the paper feeding mechanism.

[Explanation of symbols]

 6 Micro Actuator 7 Displacement Amplification Mechanism 8 Crank Mechanism 14 Crank Shaft 15 Rotor 16 Groove 17 Stopper Claw X Rotation Direction

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Motomi Ozaki 1-3-3 Nakamagome, Ota-ku, Tokyo Within Ricoh Co., Ltd. (72) Inventor Shinichi Suzuki 1-3-6 Nakamagome, Ota-ku, Tokyo In Ricoh Co., Ltd. (72) Inventor Satoru Okano 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd.

Claims (2)

[Claims] 1. A rotary vibration type microactuator driven by electrostatic force, a displacement amplification mechanism that amplifies the displacement of the rotational vibration obtained by the microactuator and extracts it as a reciprocating motion, and expands and amplifies by this displacement amplification mechanism. And a crank mechanism including a rotor having a crankshaft as a center for converting the reciprocating motion obtained as described above into a rotary motion. 2. The conveying device according to claim 1, wherein a groove is formed on a side surface of the rotor so as to make the rotation direction constant, and a stopper claw that engages with the groove is provided.