JPH0346943A - Thin plate feed mechanism - Google Patents

Abstract

PURPOSE:To obtain good contact pressure with ease by keeping the air pressure near the contact part of a motor and a thin plate below the atmosphere to give contact pressure to the thin plate and feed it. CONSTITUTION:Utilizing an ultrasonic motor 1 consisting of a piezoelectric oscillator 3 generating thickness slipping oscillation and a driving part which forms the displacement right angled to the slipping direction, a thin plate 4 is fed. At this time, the air pressure near the contact part of the motor 1 and the thin plate 4 is kept below the atmosphere by action of a fan 2 to give contact pressure to the thin plate 4 and feed it.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for feeding thin sheets of paper, cloth, metal foil, etc.

Fig. 5 shows the conventional technology of paper feeding mechanism using vibration (Japanese Patent Laid-open No. 5
As shown, the piezoelectric material 11 has electrodes 12 and 13 on the front and rear surfaces, respectively, and is moved in the front-rear direction, that is, in the direction of the arrow 14, by applying a voltage. Expand and contract. Similarly, the piezoelectric material 15 has electrodes 16 and 17 on its top and bottom surfaces, respectively.
is provided, and expands and contracts in the vertical direction, that is, in the direction of arrow 18, by applying a voltage. The relationship between the direction of expansion and contraction and the polarity of the voltage applied to the electrodes is 1. For example, by applying a negative voltage to electrodes 13 and 17 and a positive voltage to electrodes 12 and 16, piezoelectric material 11 and piezoelectric material 15 expand and contract, and the voltage The relationship is such that when the polarity of is reversed, it contracts.

The piezoelectric material 11 and the piezoelectric material 15 are pasted together via a plate spring 19 that has high conductivity and spring properties, and the other end of the piezoelectric substance 11 has a plate spring 20 that has high conductivity and spring properties. to the frame 21 via the piezoelectric material 15
The other end is directly fixed to the frame 21. The frame 21 is made of an insulator, and has a power terminal 22 for connecting the other end of the lead wire connected to the electrodes 12 and 13 of the piezoelectric material 11 and the electrodes 16 and 17 of the piezoelectric material 15. It is set up. The upper surface 23 of the piezoelectric material 11, that is, the surface that contacts the paper, is processed into an arc shape.

In order to increase the friction with the paper, a material with a high coefficient of friction, such as rubber, is attached.

In the paper feeding mechanism having such a structure, the piezoelectric material 11
and 15, the upper surface 23 of the piezoelectric material 11
extends forward with the paper 24 pressed against the head 25, and sends the paper 24 in the paper feeding direction, that is, in the direction of the arrow 26.
When the piezoelectric materials 11 and 15 are then contracted, the top surface 23 of the piezoelectric material 11 moves away from the paper 24 and returns to its original position without pulling the paper back. That is, piezoelectric materials 11 and 1
By switching the polarity of the voltage applied to the electrode 5, the locus of the portion of the piezoelectric material 11 in contact with the paper will perform an elliptical reciprocating motion.

Therefore, by switching the polarity of the voltage applied to the electrodes of the piezoelectric materials 11 and 15 at high speed, the paper can be continuously fed in one direction, and the driver 1- can be printed in accordance with the cycle of switching the polarity of the voltage. be able to.

However, the above-mentioned paper feeding mechanism has a disadvantage that the structure is complicated and expensive because the horizontal vibrator, the stacking vibrator, and the paper pressurizing body are separate.

The present invention has been made in view of the above-mentioned circumstances.
In particular, it was designed to provide a mechanism for feeding paper, etc., which has a simple structure and can provide good contact pressure.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a thin plate (
In the feeding mechanism for paper, cloth, metal foil, etc., (1) the air pressure near the contact area between the motor and the thin plate is lowered to below atmospheric pressure to apply contact pressure to the thin plate, or (2) the thin plate or (3) Feeding the thin plate by applying a contact pressure to the thin plate using electrostatic force by applying an electric charge to the upper plate and disposing a member with an opposite electric charge near the contact area between the motor and the thin plate; or (3) feeding the thin plate or the thin plate. The upper plate is made of paramagnetic material.

A magnet or an electromagnet is placed near the contact area between the motor and the thin plate, and electromagnetic force is used to apply contact pressure to the thin plate and feed it. The following will explain one embodiment of the present invention.

Fig. 1 is a perspective view of a mechanism for feeding a thin plate (paper, cloth, metal foil, etc.) according to the present invention, Fig. 2 is a view of Fig. 1 viewed from the direction of the arrow ■, and 1 in Fig. 1 is an ultrasonic motor.

2 is a fan (arrow A indicates the flow direction of the wind), 3 is a vibrator, 4 is a thin plate of paper, cloth, metal foil, etc., and the ultrasonic motor is
As shown in Fig. 2, piezoelectric vibrators (such as PZT) polarized in the direction of arrow B are formed in a comb shape, and electrodes 5 are disposed in the part indicated by the thick black line in the figure, which transmits an electric field in the Ex force direction. When applied, a thickness shear deformation occurs as shown by the dotted line, and when an electric field is applied in the direction of the Ey force, the tip of the convex portion lifts up. Ey
When an Ex force direction electric field is applied with a force direction electric field applied, a feed force in the edge direction is transmitted to the paper. When the air inside the groove is sent out using a fan at one end surrounding the groove, the groove becomes negative pressure and the paper is attracted to the tip of the motor protrusion, increasing the contact pressure and allowing one sheet of paper to be fed. Note that every other convex part is driven.

Smooth feeding is possible by driving the other with a 180'' phase shift.

FIG. 3 is a diagram showing an example in which electrostatic force is used. In FIG. When the electrode 7 is placed in the groove, an electrostatic attraction force is generated between the paper and the electrode, and the paper 4 is attracted to the tip of the motor convex part to apply contact pressure.

FIG. 4 is a diagram showing an example in which electromagnetic force is used. In the figure, 8 is an iron plate, 9 is a magnet, and as shown, a paramagnetic material such as an iron plate 8 is placed on the top surface of the paper 4. Place the magnet in the groove! A magnet 9 etc. is arranged. The iron plate 8 is attracted by the magnet 9, increasing the contact pressure of the paper 4, making it easier to feed the paper. When sending magnetic materials such as stainless steel foil, the upper iron plate is not necessary and contact pressure can be obtained directly.

In the embodiments shown in FIGS. 3 and 4, the electrodes of the vibrator 3 are omitted, but these vibrators also act in the same way as the vibrator shown in FIG. It is easy to understand that.

As is clear from the above description, according to the present invention, good contact pressure can be obtained with a simple structure by applying contact pressure to paper or the like using the grooves of the ultrasonic motor.

[Brief explanation of drawings]

Figures 1 and 2 are a perspective view showing an example of an ultrasonic motor according to the present invention and a view seen from the direction of the arrow ■, and Figures 3 and 4 are views showing other embodiments, respectively. Figure 5 is
FIG. 2 is a diagram for explaining an example of a conventional technique. DESCRIPTION OF SYMBOLS 1... Ultrasonic motor, 2... Fan, 3... Vibrator, 4... Thin plate, 5... Electrode, 6... Charger, 7
...electrode, 8...iron plate, 9...magnet. Figure 1 Figure 4 Figure 5 Figure 3

Claims (1)

[Claims] 1. In a thin plate feeding mechanism using an ultrasonic motor consisting of a piezoelectric vibrator that causes thickness shear vibration and a drive part that produces displacement perpendicular to the sliding direction, near the contact area between the motor and the thin plate A thin plate feeding mechanism that feeds the thin plate by applying contact pressure to the thin plate by reducing the air pressure to below atmospheric pressure. 2. In a thin plate feeding mechanism using an ultrasonic motor consisting of a piezoelectric vibrator that generates thickness shear vibration and a driving part that generates a displacement perpendicular to the sliding direction, an electric charge is applied to the thin plate or the upper plate, and the motor and thin plate A thin plate feeding mechanism characterized in that a member having an opposite charge is disposed near a contact portion of the thin plate to apply contact pressure to the thin plate using electrostatic force and feed the thin plate. 3. In a thin plate feeding mechanism using an ultrasonic motor consisting of a piezoelectric vibrator that generates thickness shear vibration and a driving part that produces displacement perpendicular to the sliding direction, the thin plate or its upper plate is made of a paramagnetic material, and the motor and A thin plate feeding mechanism characterized in that a magnet or electromagnet is placed near the contact portion of the thin plate to apply contact pressure to the thin plate using electromagnetic force and feed the thin plate.