DE1928769A1 - Developer device for electro-photographic copiers - Google Patents

Description

PATENT ADVOCATE

7 STUTTGART I ₁ MOSERSTRASSE 8 TELEPHONE (0711) 844003

June 4, 1969 - R 82 -

KABUSHIKI KAISHA RICOH, No, 6-3, 1-chome, Nakamagome, Otna-ku, Tokyo (Japan)

Developer device for electrophotographic copiers

The invention relates to a developer device for electrophotographic duplicating devices, in particular to a developer device for a so-called dry copier that works with magnetic brushes.

In the case of dry copiers, it is known that paper is used as light-sensitive or non-electrically sensitive paper with a photoelectrically conductive material dissolved in a binder and a latent image on such photosensitive paper To create charging and exposure «tinting agent or toner particles, the carbon black or some kind of printer's ink or other materials are milked with iron powder and attached by a magnet.

-A

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drawn to form magnetic brushes. The light sensitive The surface of a paper bearing a latent electrostatic image is processed with the magnetic brushes to remove the latent to make electrostatic image visible.

The aim of the invention is to provide a developer device in the magnetic brushes are formed on the outer surface of a rotating drum at the points corresponding to the poles of a magnet housed in the drum, around the photosensitive Surface of a sheet of photosensitive paper with a latent electrostatic image on it. Included a straight guide part should be arranged on the same side of the drum along which the guide path of the photosensitive paper moved past the magnetic brushes extends, in order to prevent such paper sheets to be developed from being deviate from the predetermined path and stir the powder forming the magnetic brushes or, in undesired Detach them from the drum circumference.

The invention is described below with further features and advantages explained and described in more detail with reference to exemplary embodiments shown in the drawings. Show it

1 shows a schematic section through a developer device according to the invention,

2 is a side view of a portion of the developer device that is essential to the invention;

Fig. 3 is a schematic section of an essential portion of a further exemplary embodiment of a developer device according to the invention and

FIG. 4 shows a side view of a section of the device according to FIG. 3 which is essential for the invention.

BATH 909850/1343

According to Fig, 1 is made of electrically insulating material rotating hollow cylinder 1 supported on a fixed axis 2 in such a way that its two end walls are movable on the axis are. Inside the rotating cylinder 1, a magnet is attached to the axis 2 by means of a feather key 4. Above the cylinder or The drum 1 is a container 6 is arranged in which powder developer 5, consisting of toner and iron powder, is located, which via a bottom opening from the container onto the outer surface of the cylinder 1 trickles down and is held magnetically on this surface. One Slide or poke plate 7 inside the container is used to convey it out of the developer powder.

The drum 1 is driven clockwise by a drive (not shown) set in rotary motion, the other outer circumference being magnetic attracted developing powder forms magnetic brushes 3a and 3b at the positions corresponding to the poles of the magnet 3 housed in the drum. Laterally above and below the poles of the magnet 3 are an endless conveyor belt 8 wrapped around rollers 9 and 10 and from an endless conveyor belt U looped rollers or rollers 12 and 13 rotatably mounted on corresponding axes. On the one not shown In addition, rollers 14 and 15 are mounted in the stationary component, which press against rollers 9 and 10 or against belt 8 located between them be, and in the same. Way are rollers on the stationary component 16 and 17 mounted which press against the rollers or cylinders 12 and 13, respectively.

There are several circumferential grooves or spaces on the rollers 14 and 16 accordingly Fig. 2 is provided, with corresponding to these grooves Places on the rollers 15 and 17 guide grooves are provided. Within each groove on rollers 14 and 16 sits one end of one made of wire existing rectilinear guide part 18 or 19. The other end this guide parts 18 or 19 is in the corresponding guide groove

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of the rollers 15 and 17 respectively. The endless conveyor belts 8 and 11 and the rectilinear guide members 18 and 19 form guide tracks for The magnetic brushes guide the photosensitive paper 3a or 3b. There is an inlet at the top of these guide tracks and an outlet is provided. The feed inlet is through baffles 20 and 21 formed, which are attached to a stationary component, not shown, while the lower ends of the guide tracks through a baffle plate 22 made of a porous material or a network.

The rollers 9 and 12 are driven by a drive, not shown, in the direction the arrows a and b in rotation, so that the conveyor belts 8 and 11 move in the direction of arrows c and d. The drum 1 rotates in the direction of arrow e. As / aie rolls 15 and 17 in. Dependence rotate from the movement of the conveyor belts 8 and 11, the rectilinear guide parts 18 and 19 are perpendicular to the guide track of the photosensitive paper moving direction back and forth. A sheet of photosensitive paper 23 coming off the conveyor belt 8 between the rollers 9 and 14 through according to the direction of arrow c is moved at the same time at its light-sensitive Side by the magnetic brush 3a, and as a result, toner particles mixed with iron powder are removed from the electrostatic latent Image attracted to the paper surface, whereby the paper develops will. The developed photosensitive paper 23 is moved by the conveyor belt 8 further through the rollers 10 and 15, from which Plate 22 deflected and moved by the conveyor belt U between the rollers 13 and 17, whereupon a processing by the magnetic Brush 3b and thus the second development process takes place. Following this second development process, the photosensitive process passes through Paper 23 rolls 12 and 16 and then leaves the front

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BATH ORIGINAL

direction. The developed paper is then transferred to the next one Fixing device to fix the visible image created by powder on the paper surface. The straight guide parts 18 and 19 prevent the photosensitive paper 23 from moving away from the guide path provided. In addition, ensure these guide members that a sufficient amount of toner powder evenly and smoothly onto the surface of the photosensitive Paper arrives, due to the back and forth movement of the guide parts, the developing powder, the magnetic Brushes 3a itnd 3b forms, before sticking to the photosensitive Mix the surface. A container 24 is provided below the deflection plate 22, in which used developer particles are collected. On the conveyor belts 8 and 11 are cleaning devices 25 and 26 gently pressed, which remove the adhering toner particles and thus keep the paper guideway clean. For each roller that is in direct Is in contact with the developed photosensitive paper 23, the same cleaning device is provided.

Fig. 3 shows a developer device with endless rectilinear guide share 36, which instead of metal wire, from Kunststoffädeη or plastic wire consist, preferably of a polyamide »The rollers 37 and and the rollers 28 and 29, the other stationary component, not shown Are stored against the rollers 9 and 1 0 or against the rollers 12 and 13 or pressed against the conveyor belts 8 and 11 running between them. According to FIG. 4, the rollers 27 and 29 each contain a number from the circumference grooves «, In the immediate vicinity of the rollers 37 and 28 are on a stationary component rollers 30 and 31 mounted on shafts. At each one side of the rollers 30 and 31 is a cam-shaped guide surface provided, while springs 32 and 33 abut on the other sides of the rollers, so that the cam-shaped η end faces with the help of the

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Springs resting against pins 34 and 35 seated on a stationary component being held. The straight guides 36 are in the Circumferential grooves of rollers 27 and 29 and rollers 30 and 31 are suspended and form a guide path for photosensitive paper through the magnetic brushes 3a and 3b together with the Conveyor belts 8 and 11. When the rollers 10 and 13 due to the movement of the conveyor belts 8 and 11 rotate, there is also a revolution of the rectilinear guide parts 36, so that the rollers 30 and 31 in the direction their axes are moved backwards, i.e. in a direction perpendicular to the guideway of the photosensitive paper «,

The invention is not limited to any particular material or method certain shape of the rectilinear guide parts and not even on the The manner in which they are hung. There are therefore other embodiments for straight guide parts within the scope of the invention conceivable that perpendicular to the path of the photosensitive paper and be moved. In addition, the invention applies to others as well Development devices applicable.

In the developing device according to the invention, rectilinear ones or linear guide members are arranged to the side of the rotating drum along the path of the photosensitive paper and are in a direction perpendicular to the path of the photosensitive paper. moved back and forth. It is possible for them to slide or slip to prevent the photosensitive paper from moving, and in addition, the developer powder that the magnetic brushes forms, mixed or shaken through the linear guide parts, so that a uniform supply of toner to the surface of the photosensitive Paper takes place and a good image quality is guaranteed.

BAD LOCAL GINAL 9098 50/1343

Claims (1)

PATENT ADVOCATE 7 STUTTGART 1, MOSERSTRASSE 8 TELEPHONE (0711) 244003 Kabushiki Kaisha Ricoh, ·. Tokyo f Japan) June 4, 1969 Claims 1, developing device for electrophotographic copiers, comprising a rotating drum, a magnet located inside the drum, a feed path for photosensitive paper which passes the locations on the outer surface of the rotating drum which correspond to the poles of the magnet located inside the drum, characterized that along the feed path of the photosensitive paper (23 ). laterally on the circumference of the rotating drum (1) rectilinear guide parts (18, 19; 36) are arranged and can be moved back and forth in a direction perpendicular or transverse to the feed path of the photosensitive paper, and that the rectilinear guide parts in the area of the circumference of the rotating Magnetic brushes (3a, 3b) formed from magnetically attracted toner particles are located on the drum, 2, device according to claim 1, characterized in that the rectilinear Guide parts consist of rods (18, 19) which are suspended at their upper end and at their lower end in guide grooves of rotating rollers (15, 17) are added, the inherent ' closed guide grooves with one revolution of the roller an axial one Have misalignment. 3, device according to claim 1, characterized in that the rectilinear Guide parts in the paper feed path on both sides of the rotating BATH ORIGINAL 909850/13 A3 Drum made of endless cords or threads (36), preferably made of plastic exist and ü'jf-r; - V; "al ze η (27, 29) belonging to paper feed are led. 4. Device according to / iur claim 3, characterized in that the guide parts consisting of wires or threads (36) each a closed loop? form and in scope _v ; .ennifM! are guided by deflection roller η (3 0, 31), dir- can be moved back and forth ajcial while the paper is being fed « 5. performing according to one of the preceding /: r *: prüclie, characterized <'* ^η α linear Guide e "steep (18, 19; 36): pit parallel to dszu <u >>~"<. ^ i - (. A'in conveyor bundles (8, 11) form the paper pre-stroke path, BAD ORlGiNAL 0/13 ^ 3 L e r s e i t e