JPS6164636A - Electrostatic conveying device - Google Patents

Abstract

PURPOSE:To make the peelability of paper ever so better and simultaneously improve durability in a feeding device as well as to prevent a contact failure from occurring, by installing a conductive contact maker embeddedly in a conductive ground layer, which has lamellarly unitized a feeding brush on an insulating support body layer. CONSTITUTION:A feeding brush 3 consists of an insulating adhesive 11 applied to the surface of a support body of an insulator, a ground layer 12 composed of a conductive fiber and a contact maker 13 of a conductive fiber embeddedly installed in this ground layer 12. The contact maker 13 being energized with current via the ground layer 12 comes into contact with each of strip electrodes 5a and 6a of first and second electrodes 5 and 6, and impresses the voltage. When high voltage is impressed in space between paired brushes 3 from a DC power source E, these electrodes 5 and 6 are energized with a continuous rating current via these strip electrodes 5a and 6a whereby electrostatic suction force is produced in a suction film layer 7, peeling paper from the top of a belt 2, thus shifting from conveyance to discharge is smoothly carried out. In addition, the contact maker 13 will in no case bring about a contact failure due to wear by friction with these strip electrodes 5a and 6a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrostatic transport device that allows easy separation of transported paper and that can effectively prevent contact failures due to wear of the power supply means.

[Conventional technology]

As a recording paper conveying means used in conventional copying machines, printing machines, printers, etc., for example, one or more pairs of opposing rollers (at least one of which is a rubber roller) are rotated with their peripheral surfaces in contact with each other. Some devices are configured to push out and convey the paper using frictional resistance between the circumferential surfaces of the paper. However, this conveyance means has a problem in that the conveyance ability is reduced due to a decrease in the friction coefficient of the rubber roller peripheral surface due to wear and heat. Further, as a paper conveyance device using an endless belt that utilizes electrostatic adsorption force, there is, for example, one described in Japanese Patent Laid-Open No. 50-31828. In this device, a flexible electrical insulating layer is provided on a conductive belt, two sets of comb-shaped electrodes are provided on the electrical insulating layer so as to face each other, and a dielectric layer is provided on the upper surface of the comb-shaped electrode. It is configured to apply a voltage to two sets of comb-shaped electrodes to generate an electrostatic field between the electrodes, thereby electrostatically attracting paper or the like and transporting it. Each of the opposing comb-shaped electrodes has a band-shaped base portion endlessly disposed along both side edges of the conductive belt, and a strip-shaped base portion protruding from each base portion toward the inner side in the width direction of the belt. Each comb-shaped electrode is comprised of a plurality of strip-shaped branches, and each comb-shaped electrode is configured such that a voltage is applied between the electrodes by each slider in sliding contact with each base. According to this paper conveying device, sufficient adsorption force can be ensured.

[Problem that the invention seeks to solve]

However, in this conveying device, all the strip-shaped branches of each comb-shaped electrode are electrically connected via each base, so all the branches are energized by the power supply from each slider. As a result, an electrostatic attraction force is generated over the entire length of the endless dielectric layer. Therefore, in order to eject the paper that is attracted to the belt and conveyed by the electrostatic attraction force of the dielectric layer, the paper that is attracted to the belt must be forcibly peeled off, or the paper must be removed from the slider. It was necessary to stop the power supply. However, forced peeling increases the possibility of paper damage and requires the installation of a peeling mechanism, which may complicate the structure and increase manufacturing costs. In addition, stopping the power supply will stop the suction force of the whole length, which may make it difficult to continuously convey a plurality of sheets. Further, the slider made of a metal piece may be worn out by sliding on the base of the comb-shaped electrode, resulting in poor contact. For this reason, the comb-shaped electrodes on the belt are divided into multiple independent sections along the length of the belt, and multiple sliders are provided to supply power to each section. There is also a system in which power is not supplied to the LJ, which is the section that has entered the position, to facilitate paper ejection. However, even in this device, since the slider made of a metal piece is brought into sliding contact with the base of the comb-shaped electrode, there is a problem in the durability of the slider as described above.

[Means and effects for solving the problems] The present invention has the following features:
This was done in view of the above, and in order to improve the peelability of the paper and at the same time improve the durability of the power supply means and prevent contact failures, strip-shaped interconnects are placed on an endless insulating substrate. Independent first and second electrodes are alternately arranged and fixed, and the first and second electrodes are semi-conductive with one strip electrode at one end of each of the first and second electrodes exposed. It consists of an electrostatic adsorption belt covered with an adsorption film layer made of resin, and a power supply brush that is in sliding contact with each of the strip electrodes of the first and second ministers, and the power supply brush is placed on an insulating support layer, The present invention provides an electrostatic transport device that includes a conductive base layer that is laminated and integrated, and a conductive contact that is implanted in the base layer.

〔Example〕

The electrostatic transport device of the present invention will be explained below.

FIG. 1 shows an embodiment of the present invention, in which a suction belt 2 is stretched endlessly between rollers la and lb and runs in the direction of the arrow.
and a power supply brush 3 disposed along the back running surface of the suction belt 2. As shown in FIGS. 2(a), 2(b), and 3, the suction belt 2 is attached to an endless insulating substrate 4 made of a flexible insulating material and alternately parallel to the surface of the insulating substrate 4. A first electrode 5 and a second electrode 6 arranged in the form of strips, a strip electrode 5a protruding from the outer end of the first electrode 5 and penetrating the substrate 4 and exposed from the back surface, The strip electrode 6a protrudes from the outer end of the electrode 6 and is exposed from the back surface of the substrate 4, the first and second electrodes 5.6, and the adsorption film layer 7 of a semiconducting resin (for example, a thin layer) that covers the surface of the substrate 4. Thickness 0.5 u+)
It is composed of.

The first electrode 5 and the strip electrode 5a and the second electrode 6 and the strip electrode 6a are electrically connected, respectively.

FIG. 4 is a cross-sectional view showing the structure of the power supply brush 3, which includes a support layer 10 made of a turret edge, and a support layer 1.
0, an insulating adhesive 11 such as nylon or acrylic applied to the surface of F, a base layer 12 of a woven fabric made of Ei conductive fibers (for example, "Thunderkun" manufactured by Nippon Jage Co., Ltd.), and a base F
! It is composed of a contact made of conductive fiber implanted in i12. The contact 13 has, for example, a thickness of 5 d, a specific resistance value of 10 2 Ωcm, and a length of 5 cm, and is fixed on the support layer 10 via the adhesive 11 while being planted and fixed on the base layer 12 . The structure is such that each contact A1 13 is brought into an a-voltage state by disconnecting the base layer 12 from the power source. As shown in FIG.
The strip electrodes 6a are arranged and fixed one by one (or a plurality of each) along the traveling direction (trajectory of movement), and as the belt 2 advances, the contactor 13 comes into contact with each of the strip electrodes 5a and 6a, and the power is supplied. It is configured to apply a voltage from E.

The operation of one embodiment of the present invention will be explained based on the above configuration. In FIG. 5, when switch S is turned on, a high voltage (for example, 1000 V) is applied between the pair of power supply brushes 3 from the DC type tAE. , strip electrode 5a
Since the first electrode 5 and the second electrode 6 are energized through the electrodes 6a and 6a, an electrostatic adsorption force is generated in the adsorption film layer 7 due to electrostatic induction. Since electrostatic adsorption force is generated on the belt 2 only in the section where the pair of power supply brushes 3 are located, the power supply brush 3 is arranged only in the section where the paper, etc. is fed by 1 m, while the paper, etc. is placed on the belt 2. If the power supply brush 3 is not disposed at the position where the paper is peeled off and ejected from above, the transition from one general feeding of paper to ejection will be performed smoothly, and continuous one feeding and ejection of paper will be performed. becomes possible. Damage to the paper is also effectively prevented, and the configuration does not become complicated. Also,
The contactor 13 of the power supply brush does not cause contact failure due to wear of one member due to friction with the strip electrodes 5a, 6a.

Next, FIGS. 6(a), 6(b) and 6(c) each show an application example of the apparatus of the present invention. First of all, FIG. 6(a) shows the device of the present invention used as a feed means for taking out the copy paper 14 in a copying machine, etc.
The apparatus of the present invention is arranged so that the lower running surface of the belt 2 is in surface contact with the upper surface of the paper 14 stacked above. Since the pair of power feeding flanges 3 is disposed only on the back side of the lower running surface of the belt 2, the uppermost paper 14 attracted by the belt 2 is sent out in the direction of the arrow, and reaches the position of the roller 1b. It never flips upwards. The power supply to the power supply brush 3 is turned on and off by, for example, a control unit such as a microcomputer (not shown), and is controlled to be turned on and off in synchronization with the on/off of the drive units of the rollers la and lb.

Next, in FIG. 6(b), a sheet of paper is placed in the transfer section of the electrophotographic copying machine.
This is an example in which the apparatus of the present invention is applied as a means for conveying 4, 16 is a transfer drum, and 17 is a transfer corotron. Since multiple pairs of registration rollers, guide pawls, etc. are not required, the configuration can be simplified, and at the same time, the chances of clogging can be significantly reduced.

FIG. 6(C) shows an example in which the apparatus of the present invention is applied as a means for conveying paper to the transfer section of a transfer drum-type color copier.
Rollers 1a, 1b and roller IC arranged on both sides of
A C-shaped power supply brush 3 is disposed on the back side of the belt surface furthest from the drum 16. Since the power supply brush 3 is not provided on the belt part between the rollers lmy1cm1b, the paper 14 is transferred to the transfer corotron 1.
7 and the drum 16, and after receiving the transfer of the toner image (for example, cyan), it is attracted to the belt 2 at the position of the roller ■b. +, the toner is conveyed in the direction of the arrow, enters again between the transfer corotron 17 and the drum 16, and receives the transfer of a toner image (for example, yellow). In conventional transfer drum type color copiers, the paper is held down by a roller or the like to prevent the paper from slipping off the outer peripheral surface of the drum 16. Therefore, the transferred toner image may be disturbed. On the other hand, according to the application example shown in FIG. 6(c), the belt 2 does not come into contact with the transfer surface of the paper 14, so the above-mentioned fear does not occur.

〔Effect of the invention〕

As explained above, according to the electrostatic transfer device 2 of the present invention, short-sided mutually independent first and second electrodes are alternately arranged and fixed on an endless insulating substrate, and The first
and an electrostatic adsorption belt in which the first and second electrodes are covered with an adsorption film layer made of a semi-electrosensitive resin with a strip electrode at each end of the second electrode exposed; It consists of a power supply flanno in sliding contact with each strip electrode of the weight, and the power supply brush is integrated with a conductive base layer laminated on the insulating I main support layer, and a conductive base layer implanted in the base layer. Since it is composed of a conductive contact force, it is possible to improve the peelability of the paper, and at the same time, improve the durability of the power supply means and prevent the occurrence of poor contact.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 (a), (b), and (c) are a front view, plan view, and side view of an electrostatic adsorption belt, and Fig. 3 is a strip-shaped electrode. FIG. 4 is an explanatory diagram of the structure of the power supply brush, FIG. 5 is an explanatory diagram of the arrangement of the power supply brush, and FIGS. 6 (a), (b), and (c) are examples of application of the device of the present invention, respectively. Beggar book JUL Akime. Explanation of symbols la, lb, 1c -- Roller 2... Electrostatic adsorption belt 3... Power supply brush 4... Insulating substrate 5... First electrode 6... Second electrode 5a, 6a...Strip' separator 7...Adsorption film layer 10...Support layer 11...Insulating adhesive layer 12...Underlayer 13...Contactor 14...Paper 15... ...Paper feed tray 16...Transfer drum 17...Transfer Corotron Patent applicant Fuji Xerox Co., Ltd. Agent Patent attorney Shin Matsuhara 2 Same Kiyoshi Muraki Same Same Hirata, Tadao Same Same Jun Kamijima - Same Lead End Hitoshi 2F (1 Figure 1 I d) +I
XJ Figure 6

Claims (1)

[Claims] Mutually independent first and second electrodes are alternately arranged on an endless insulating substrate, and a portion of each of the first and second electrodes is exposed. an electrostatic adsorption belt in which the first and second electrodes are covered with an adsorption film layer made of a semiconductive resin; and a power supply brush that is in sliding contact with the exposed portions of the first and second electrodes. The power feeding brush is composed of a conductive base layer integrally laminated on an insulating support layer, and a conductive contact supported by the base layer. Conveyance device.