JPS62121168A - Holding or transporting device for sheet material - Google Patents

Abstract

PURPOSE:To improve safety and simplify constitution by temporarily neutralizing the electric charge induced on the outer peripheral surface of a holding transporting member, thus suppressing the adhesion of dusts onto the outer peripheral surface and preventing the adhesion force from varying through the lapse of time, when the sheet material is held or transported. CONSTITUTION:A sheet material is adsorbed by the electrostatic attractive force applied by a voltage applying means 12, revolving a holding transporting member 1, and transported in revolution to other position. When transportation is not carried out, the application of voltage is released by opening a switch 12b, and the electric charge on an electrode 9 is removed, and the electric charge on the outer peripheral surface of the holding transporting member 1 is neutralized to prevent the adhesion of dusts onto the outer peripheral surface. Therefore, when the sheet material is held or transported, the adsorption force is prevented from varying through the lapse of time, and safety is improved, and since the constitution is simple, manufacture is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a sheet-like object holding or conveying device for holding or conveying a sheet-like object such as paper or film.

Prior Art Conventionally, as a holding or conveying device for sheet-like objects,
As shown in JP-A-59-227657, an electret layer having a positive electric field and a negative electric field on one side is provided on the surface of a belt-like or roll-like support for conveying or holding a sheet-like object. It has been known.

However, in this device for holding or conveying sheet-like objects, the electret layer on the surface of the support is always charged with a high potential, so the force that attracts dust in the air and the sheet-like object increases over time. It has disadvantages that it tends to be small, has low safety, and is not easy to manufacture because it requires a process of charging the electret layer to a high potential.

Purpose An object of the present invention is to provide a method in which the force for adsorbing a sheet-like object does not easily change over time, and is highly safe.

An object of the present invention is to provide a sheet-shaped object holding or conveying device that is easy to manufacture.

Structure: The present invention includes a rotatable cylindrical holding and conveying member formed of a dielectric material and having an opening at one end, and a longitudinal direction of the holding and conveying member inside the holding and conveying member through the opening of the holding and conveying member. A plurality of annular electrodes or electrodes in the shape of dividing an annular ring arranged at predetermined intervals, and a voltage applied to these electrodes so that the polarity alternates in the longitudinal direction of the holding and conveying member. The apparatus is characterized in that the electric charge of the electrode induces charges on the outer circumferential surface of the holding and conveying member so that positive electric areas and negative electric areas alternate in the longitudinal direction of the holding and conveying member.

Next, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 1, reference numeral 1 indicates a cylindrical holding and conveying member. The holding and conveying member 1 is made of a dielectric material and has an open end. This holding and conveying member 1 is fixed to a rotating shaft 2 by a fixing member 3. The rotating shaft 2 is rotatably supported by bearings 4, 4. Six gears 5 are fixed to the rotating shaft 2, and a motor 6 is disposed near the six gears 5. The drive shaft 6 of this motor 6
A gear 7 is fixed to a, and the gear 7 meshes with the gear 5. The motor 61, gear 7.5, and rotating shaft 2 constitute a driving means 8 for rotating the holding and conveying member 1.

Inside the holding and conveying member 1, a plurality of annular electrodes 9 are arranged at predetermined intervals in the longitudinal direction of the holding and conveying member 1 through the opening thereof.

These electrodes 9 are fixed to an insulating support member 10, and the end of this support member 10 is fixed to a stationary member 11.

The electrode 9 is connected to voltage applying means 12 . This voltage application means 12 includes a DC power supply 12a.

It consists of a switch 12b connected in series with this. The electrodes 9 are alternately connected to the anode and cathode of the DC power source 12a so that their polarities alternate in the longitudinal direction of the holding and conveying member 1 when the switch 12b of the voltage application means 12 is closed.

When a voltage is applied to the electrode 9 by the voltage applying means 12, as shown in FIG. Correspondingly, a positive or negative charge is induced on the outer circumferential surface of the holding and conveying member 1, and a loop-shaped positive electric area and negative electric area are formed on the outer circumferential surface of the holding and conveying member 1 in the longitudinal direction of the holding and conveying member 1. are formed alternately. When the sheet-like object 13 approaches or comes into contact with the holding and conveying member 1 in this state, a negative or positive charge is induced in the sheet-like object 13 by the positive or negative charge of the holding and conveying member 1, and these charges are The sheet-like object 13 is attracted to the holding and conveying member 1 by electrostatic attraction.

When the holding and conveying member 1 is stopped after the sheet-like object 13 is attracted to the holding and conveying member 1 by electrostatic attraction while rotating the holding and conveying member 1, the sheet-like object 13 is held at a predetermined position on the holding and conveying member 1 due to the electrostatic attraction. While rotating the holding and conveying member 1, the sheet-like object 13 is attracted to the holding and conveying member 1 by electrostatic attraction, and then the sheet-like object 13 is moved to another position by rotating the holding and conveying member 1 without stopping. It can be transported to Even if the holding and conveying member 1 is rotated, the polarity of the charges in the circumferential direction of the holding and conveying member 1 remains the same.

Since the polarity states of the charges on the holding and conveying member 1 and the sheet-like object 13 do not change, the electrostatic attraction to the sheet-like object 13 is constant.

When the switch 12b of the 11 pressure applying means 12 is opened, the charge on the electrode 9 is erased, and the charge on the holding and conveying member 1 whose total charge amount is almost zero is neutralized. Sheet-like object 13 induced by electric charge
The charges are neutralized and the holding and conveying member 1 and the sheet-like object 13
Since the electrostatic attraction acting on the electrode 9 becomes almost zero, when the application of voltage to the electrode 9 by the voltage applying means 12 is released, the sheet-like object 13 is separated from the holding and conveying member 1 and conveyed to another position. Cheap.

When the sheet-like object 13 is not held or conveyed by the holding and conveying member 1, when the voltage application of the voltage applying means 12 to the electrode 9 is canceled, the electric charge on the outer peripheral surface of the holding and conveying member 1 is neutralized, so that the sheet-like object 13 is not held or conveyed. Since dust is less likely to adhere to the outer circumferential surface of the member 1, the force that attracts the sheet-like object 13 to the holding and conveying member 1 during holding or conveying the sheet-like object 13 is less likely to change over time, and safety is high.

Note that the electrode 9 may have a shape obtained by dividing a circular ring as shown in FIG.

Since the electric charge induced on the outer circumferential surface of the holding and conveying member can be neutralized when unnecessary, dust is less likely to accumulate on the outer circumferential surface of the holding and conveying member. The force of adsorption to the member does not easily change over time, the safety is high, and the structure is simple, making it easy to manufacture.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the sheet-shaped object holding or conveying device of the present invention, FIG. 2 is an explanatory diagram for explaining the present invention, and FIG. It is a cross section showing an example. DESCRIPTION OF SYMBOLS 1... Holding and conveying member, 8... Drive means 19... Electrode 112... Voltage application means.

Claims (1)

[Claims] A rotatable cylindrical holding and conveying member made of a dielectric material and having an opening at one end; a driving means for rotating the holding and conveying member; and a drive means for rotating the holding and conveying member, and A plurality of annular electrodes or electrodes in the shape of a divided annular ring are arranged inside at predetermined intervals in the longitudinal direction of the holding and conveying member, and the holding and conveying member has a plurality of annular electrodes arranged at predetermined intervals in the longitudinal direction. and a voltage applying means for applying a voltage to the electrode, and the electric charge of the electrode induces charges on the outer circumferential surface of the holding and carrying member so that positive electric areas and negative electric areas alternate in the longitudinal direction of the holding and carrying member. A holding or conveying device for a sheet-like object, characterized in that: