JPS60112542A - Paper feeding apparatus - Google Patents

Abstract

PURPOSE:To permit the stable paper feeding work by installng a pair of comb- shaped electrodes inside the dielectric layer formed onto the surface of a roller and applying a voltage onto these electrodes and allowing the paper to be adsorbed onto the rolle without being influenced by the variation of the friction coefficient and without generating noise. CONSTITUTION:A d.c. high voltage is applied between a pair of electrodes 11a and 11b of an electrostatic adsorbing roller 1 by a battery 13, and a strong magnetic field is generated between the electrodes 11a and 11b, and an electrostatic electric field is formed onto a dielectric layer 12 which covers the surfaces of these electrodes 11a and 11b. The paper to be sent-out onto the roller 1 whose surface is covered with the dielectric layer 12 is adsorbed by the electrostatic induction of the electrostatic electric field formed. In this state, a driving shaft is revolved by a paper feeding signal, and said revolution moment is transmitted to an electrostatic adsorbing roller 1 through a joint part 6 and a one weight 4, and the roller is revolved to send-out the paper sheet adsorbed onto the roller 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device that feeds paper in a copying machine, a printing machine, etc.

[Prior art]

Conventionally, a paper feeding device for feeding L sheets at a time from a stack of paper stacks in a copying machine or printing machine (-) has been used as a paper feeding device that presses a rubber roller for feeding one sheet of paper and rotates it. A method of feeding paper by friction with the paper (a double-sided device is widely used. Also, as a paper feeding device, high-speed machines etc.
A method of feeding paper by air absorption called a nuniffer is also known.

However, in the former case (-), the rubber roller may be affected by temperature, time (2) or toner, ozone, etc. (-).
As a result, the hardness changes, and the M friction coefficient with the paper changes, and if the rubber roller deteriorates and the friction coefficient decreases, paper feed failures occur, such as paper feeding not being performed. On the other hand, in the case of the latter, there are problems such as the equipment is large and tends to generate noise.

[Purpose of the invention]

This invention was made in view of the above points, and is not affected by changes in the friction coefficient (as in the case of paper feeding using rubber rollers), does not require a large-scale device, and does not cause noise problems. The purpose is to provide a paper device.

[Structure of the invention]

In order to achieve the above object, the present invention provides a surface of a paper feeding roller (a two-dielectric layer is provided, a pair of comb-shaped electrodes is provided inside the roller, and a voltage is applied to this electrode to generate an electrostatic field. It is designed to attract paper.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 3 show the external appearance and internal structure of an embodiment of the present invention, and FIG. 3 shows its circuit configuration.

In Figures 1 and 2, (1) is an electrostatic attraction roller for paper feeding, (2) and (3) are a battery compartment and a booster compartment for storing the battery and booster, and (4) is a one-way clutch provided at one end, and a joint portion (6) (not shown) for receiving rotational force from a drive shaft is formed on the rotating shaft (5) on the one-way clutch (4) side. As shown in Fig. 2, the electrostatic adsorption roller (1) has a one-way clutch (4) and a rotating shaft (5) on the lid (7) side supported by a frame (8) and a bearing (9), respectively. Rotatable (: attached to the frame (8).

The electrostatic attraction roller (1) has a pair of comb-shaped electrodes (lla) and (llb) provided on the surface of a resin cylinder (10) as shown in FIGS. , and further coated its surface with a dielectric layer (12+) made of an insulating material as an adsorption film
Covering with (consisting of two) a pair of electrodes (ll
a) and (llb) are formed by thermally welding such a dielectric layer (12) to the resin cylinder (10) with electrodes (lla) and (llb) interposed therebetween. It is fixed between the dielectric layer (12Q) and the cylinder (10).

The inside of the electrostatic attraction roller (1) is hollow, and a power source for obtaining electric power for supplying the electrodes (lla) and (rtb) is installed inside the electrostatic attraction roller (1). In other words, a hollow resin cylinder (for example, two 1.5V batteries (13) and a booster (14) are stored, and the battery (13) is connected to the booster (14) C. Electrical (=
It is connected. The booster (14) is a DC-DC converter that increases the voltage of the battery (13) by, for example, 1000 times (2 times) so that an electrostatic field is formed by the electrodes (lla) and (Il, b). and aooo v, which is supplied with power to the pair of electrodes (I J, a) and (llb).And in this way, the electrodes (lla
), (11, b), a strong electric field is generated between the electrodes (11, a), (llb), and the nearby (
The paper to be sent out is attracted by an electrostatic attraction roller (1) due to electrostatic induction in the two sheets of paper placed on the paper, and is sent out as the electrostatic attraction roller (1) rotates.

According to the above configuration, when feeding out sheets of paper one by one from a stacked stack of papers, the electrostatic adsorption roller (1) is simply pressed lightly onto the stacked papers, and the paper is transferred to the electrostatic adsorption roller (1) ( - Therefore, the copying process starts in a copying machine, for example, and the paper feed signal (- Therefore, the previously mentioned drive shaft (not shown) rotates, the joint part (6) receives this rotational force, and the one-way clutch (4) When the electrostatic adsorption roller (1) receives rotational force from the joint part (6) and rotates, it can send out the paper that has been adsorbed.Therefore, unlike the case of conventional rubber rollers, there is no friction between the two. It is possible to perform stable paper feeding without causing paper feeding defects such as paper feeding not being performed due to changes in the coefficient (2), and reliable paper feeding can be maintained. In addition, the second sheet of loaded paper has only a small suction force, so five sheets can be fed out one by one. Although it is not necessary, a paper holding claw may be provided to prevent double feeding when feeding stacked stacks of paper.Also, a voltage is applied to the electrodes (11,a) and (llb). Although power is supplied by providing a device that applies , the power consumption is small, so there is no need to provide a switch to cut off the power supply, and the structure may be such that power is supplied at any time.

The electrostatic adsorption roller (1) is used as a paper feeding roller.

Since the dielectric layer (12) is provided on the surface and a pair of comb-shaped electrodes (11, a) and (11, b) are provided inside the dielectric layer (12), the interior is hollow (2), and this interior (= power supply In this way, if the structure is incorporated using the inside, there is no need to receive power from the outside, so there is no need for a contact brush, etc., and paper feeding failures due to poor contact of the contact brush can be avoided. It can also prevent short circuits due to high pressure.

In the above embodiment, the case where the electrostatic adsorption roller (1) is a book has been explained, but a plurality of books may be arranged coaxially, and in that case, a claw for paper separation may be provided between the rollers. You can do two. Furthermore, in the above explanation, the case where the stacked paper is fed from the top surface is taken as an example (-), but the present invention is not limited to this. Of course.

〔Effect of the invention〕

As described above, this invention is not affected by changes in the coefficient of friction C'l- as is the case with rubber rollers (bi-stable paper feeding is possible, so paper feeding can be carried out reliably over a long period of time). can be maintained.

In addition, unlike air suction, the device is large-scale (e.g., there is no risk of noise or noise).

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a sectional view showing its internal structure, and FIG. 8 is a circuit diagram showing the circuit configuration. Code explanation

Claims (1)

[Claims] A paper feed roller (a device that feeds paper from 2 to 2) with a dielectric layer on its surface and a roller with a pair of comb-shaped electrodes on the inside (37), and a roller that feeds paper using an electrostatic field. and a device for applying a voltage to the electrodes to attract the paper.