JPS61137180A - Toner removing device - Google Patents

Abstract

PURPOSE:To obtain permanently good image quality from a photosensitive member by rubbing respectively the front and rear surfaces of a blade in the thickness direction by using a film in the stage when the blade detaches from a photosensitive member thereby scrapping off the deposit. CONSTITUTION:A turning plate 20 energized by a spring member 25 in the direction of an arrow 56 turns around a stop pin 34, then the film 23 approaches to the rear surface 10a of the blade 9. The edge 23a of the film 23 rubs the rear surface 10a to scrape off the deposit. Since a shaft 14 turns in an arrow 54 direction, the edge 33a of the film 33 rubs the front surface 10b of the blade and therefore the deposit sticking to the blade 9 from the front 10b to the edge 10 is scraped off. The edge 33a rubs further the edge 10 and the edge 23a of the film 23 to scrape off the deposit. After the edge 10 of the blade 9 from which the deposit is scraped contacts with a photosensitive member 5 under the prescribed pressure, the member 5 turns in an arrow direction and the prescribed process is repeated. The toner image is thus formed and a toner removing device 1 is operated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a toner removing device installed in an electronic copying machine or the like, and more particularly to a toner removing device for removing deposits attached to a toner removing blade.

[Background of the invention]

Electronic copying devices that are currently widely used include charging, exposure,
Copying is performed by repeating the steps of development, transfer, and toner removal, and among these steps, toner removal is also an important step. Many proposals have been made in the past as toner removal devices for removing deposits such as toner from photosensitive members. The most common method is the blade cleaning method, in which a blade made of an elastic material is used to scrape off the deposits from the surface of the photosensitive member. A method has been proposed in which the timing of contact and separation is adjusted so that no uncleaned portion is left on the surface of the photosensitive member.

All of these conventional toner removal devices are for removing toner and other deposits on the surface of the photosensitive member.
There was no device that could remove the deposits that adhered to the blades.

The deposits mentioned above are mainly toner, but there is also paper dust present on the paper. If there are paper dust on the paper,
Since the transfer is performed by applying electric charge from the transfer corona discharger, the paper powder is also electrostatically charged and electrostatically attracted to the surface of the photoreceptor. This paper powder is in the form of fine threads of fibers that make up the paper, and is difficult to scrape off with the pressure force of the blade, and if it adheres to the edge of the blade, more paper powder will adhere and accumulate. As the amount of paper dust increases, the toner removal effect of the blade decreases.Furthermore, paper dust is hard, so if the edge part with paper dust attached is pressed against the surface of the photoreceptor for a long time, the paper dust will become attached to the photosensitive member. Since the surface is rubbed, scratches are caused on the surface of the photoreceptor. Therefore, the toner removal effect is reduced, which not only deteriorates the quality of copied or printed images but also shortens the life of the photosensitive member. Also, when scraping off toner with the edge of the blade, the toner slips through the scraping part, becoming so-called back-flowing toner, which accumulates in small amounts after long periods of use, and paper dust is removed when the toner is removed. There is also a problem in that it adheres to the surface of the photosensitive member and becomes an obstacle to charging the surface of the photosensitive member.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and an object thereof is to provide a toner removal device that can stably remove deposits on a photosensitive member over a long period of time and that can obtain high-quality images. It is on offer.

[Summary of the invention]

The present invention is designed to remove deposits such as toner remaining on the surface of a photosensitive member of an electronic copying device by rubbing two films on the back surface and the opposite surface in the thickness direction of a blade. This is what I did.

For this reason, a blade support member supporting the blade at one end is rotatably supported on the main body of the toner removal device, and a first film is attached to the other end of a movable plate whose one end is rotatably attached to the blade support member. The movable plate is urged in the direction of the blade by a spring member, and the rotation of the blade support member causes the first film to rub against the back surface of the blade in the thickness direction, and the toner removal device body is separately provided. A rotating member is pivotally supported so as to be rotatable, and a second
A second film is provided, and the upper end of the second film is connected to one end of the blade support member on the opposite side of the blade by a spring member, and the second film is pressed and rubbed on the blade surface to achieve the desired purpose. This is what was done.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a toner removing device according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. The toner removing device 1 is housed in an irregularly shaped cylindrical case 3 having an opening 2 formed in the front and side plates 4 provided on both sides. This opening 2 is provided close to a photosensitive member 5 formed by forming a photosensitive layer 7 on a conductive drum 6, and each of the openings 2 is made of an elastic material that performs the toner removing action of the toner removing device 1. The three members formed by this, namely the shielding film 8, the edge portion 1o of the blade 9, and the shielding film 11 protrude to press against and press against the surface of the photosensitive member 5 and to separate.

The blade 9 is held by a groove 13 formed at one end of a blade support member 12, and the blade support member 12 is rotatably supported by a shaft 14. A protrusion 15 is provided near one end of the blade support member 12 on the opposite side to the one end where the groove 13 is formed, and a pin 16 is implanted in the protrusion 15 and a hole 17 is bored therein. Close. Further, a support member 18 is provided on the groove 13 side of the blade support member 12, and a movable plate 20 is rotatably supported on this support member 18 via a shaft 19. Both sides of one end of this movable plate 20 in the width direction are folded.
The shaft 19 passes through holes formed in the support parts 21 on both sides and holes formed in the support member 18. One end of the movable plate 20 opposite to the support portion 21 is bent at a substantially right angle to form an adhesive portion 22, to which the film 23 of item 1 is adhered. The height 24 of the first film 23 protruding toward the blade 9 is approximately equal to the thickness of the blade 9.

One end of a spring member 25 is fixed to the upper surface of the blade support member 12, and the other end of this spring member 25 is provided at a position where it comes into contact with the movable plate 20. This allows the movable plate 20 to come into pressure contact with the blade 9. This movable plate 20 is locked by a stop pin 34 during operation.

The rotating member 28 has a dogleg shape.
It is rotatably supported by a support hole 29 formed near the bent portion of 8 and a pin 3 implanted in the side plate 4, respectively. A support portion 26 is formed at one end of this rotating member 28, and one end of a rectangular second film 33 that comes into contact with the lower surface of the blade 9 is adhered to this support portion 26. The blade support member 12 is sandwiched between the movable plate 20 and the movable plate 20. A hole 31 is formed near one end of the rotary member 28 on the opposite side from the support portion 26, and this hole 31 and the blade support member 1 are connected to each other.
A coil spring 32 is installed between the second film 33 and the hole 17 formed in the second protrusion 15, and the tip of the second film 33 is biased to be able to slide against the lower surface of the blade 9.

The shielding film 11 is adhered to an adhesive surface 38 formed at one end of a support member 35, and this support member 35 is rotated by a shaft 36 fixed to the shell-passing side plate 4 through a hole 37 formed approximately in the center. movably pivoted. An engaging portion 39 that engages with the link 40 is formed at one end of the supporting member 35 opposite to the adhesive surface 38, and is rotatably engaged with the link 40 via a pin 41. Support member 35
The operating range is the two stop bins 4 installed on the side plate 4.
2 and 43. A long hole 44 is formed at the other lower end of the link 40, and a pin 16 provided on the protrusion 15 of the blade support member 12 is engaged in the long hole 44. The coil spring 4 installed between the pin 45 implanted in the pin 16 and the pin 16
6 urges the blade support member 12 to rotate counterclockwise.

The toner 48 on the surface of the photosensitive member 5 scraped off by the blade 9 is carried out in a predetermined direction by a screw conveyor 47 disposed directly below and rotating in the direction of the arrow. The shielding film 8 is retracted from a short elastic body, one end is adhered to the edge 49 of the case 3, the other end is in contact with the surface of the photosensitive member 5, and remains on the surface of the photosensitive member 5 rotating in the direction of the arrow. This is to prevent the toner 48 passed through and scraped off by the blade 9 from scattering to the outside. In addition, flocking material 50 is placed on the surfaces of both side plates 4 that come into contact with the photosensitive member 5.
f. It is provided and shielded to prevent toner from scattering outside the device.

The operation of this embodiment configured as described above will be described below with reference to FIGS. 2, 3, and 4.

When copying or printing is completed, the photosensitive member 5 rotates by a predetermined angle and then stops in order to remove toner remaining on its surface. At this time, when the current to the solenoid (not shown) is cut off and the biasing force in the direction of arrow 53 disappears, it is rotated in the direction of arrow 54 by a spring (not shown), and the blade support member 12 is rotated as shown in FIG. The blade 9 is separated from the photosensitive member 5, and the edge portion 10 of the blade 9 is at the point m5.
Move on the trajectory shown by 1. The rotating plate 20, which is locked to a stop pin 34 provided at a position that does not interfere with the rotation of the blade 9 and is biased by the spring member 25 in the direction of the arrow 56, is rotated by the rotation of the blade support member 12. While waiting for the blade 9 to approach, the rotating plate 20 also rotates around the stop bin 34 as the support 19 moves, the first film 23 also approaches the back surface 10a of the blade 9, and finally the first film 23 approaches the back surface 10a of the blade 9. Approximately half of the back surface 10a of the blade 9 is rubbed by the edge portion 23a of the film 23.

At this time, as mentioned above, the height 24 of the first film 23 is
is equal to the thickness of the blade 9 (which is 5 mm in this device), so the back surface 10a of the blade 9 is rubbed by the film 23 of the whistle 1 until the rotary plate 20 comes into contact with the blade 9. The deposits adhering to the back surface 10a are scraped off by the edge portion 23a of the first film 23.

The blade 9, the rotating plate 20, and the first film 23H rotate together around the shaft 14, and a locus force is applied to the tip thereof, and the edge portion 33a of the second film 33 rotates around the shaft 30.
A trajectory 52 is traced around . At this time, since the shaft 14 rotates in the direction of the arrow 54 as shown in FIG. The second centering on
reaches the intersection of the locus 52 drawn by the etched portion 33a of the film 33. During this time, the edge portion 33a of the second film 33
slides on the surface 10bQ of the blade 9, so the blade 9
Scrape off any deposits that adhere to the edge portion 1o of the surface 10b.

Furthermore, as shown in FIG. 4, at the position where the blade support member 12 abuts against the lug pin 55 and stops rotating in the direction of arrow 54, the edge portion 33a of the second film 33 is in the position shown in the figure. , it can be reliably scraped off by the edge portion 1o and the edge portions 23a and 33a of the first film 23 and the second films 23 and 33. FIG. This indicates the rest state of the toner removing device, and is also the time position for the next toner removal.When starting the toner removal operation again, return to the above-mentioned respective trajectories 51 and 52, and sequentially move from 1 to 1 from FIG. After the state shifts to the state shown in the figure and the edge portion 10 of the blade 9 from which the deposits have been scraped comes into contact with the photosensitive member 5 with a predetermined pressure, the photosensitive member 5 rotates in the direction of the arrow and performs the aforementioned predetermined process. As a result, a toner image is formed, and the toner removing device 1 is activated.

The blade 9 according to this embodiment is made of an elastic material such as urethane, has a hardness of about 70 degrees, and is highly wear resistant. If the first and second films 23 and 33 that are rubbed against the blade 9 are made of the same material as the blade 9, frictional electricity will not be generated when they are rubbed against the blade 9 and the films will be scraped off. Electricity is generated and toner scatters. In order to prevent the toner from coming out of the device due to this toner scattering, a shielding film 1 is installed as shown in FIG.
1 to maintain airtightness between the photosensitive member 5 and the photosensitive member 5. The blade support member 12 is biased in the direction of the arrow 53, and the blade 9
When the bottle 16 is in a position to scrape off toner, the bottle 16 comes into contact with the upper inner surface 44a of the elongated hole 44 of the link 40, and the link 4
0 to push up the support member 35 to separate the shielding film 11 from the surface of the photosensitive layer 7 as shown in the figure.

When copying or printing is completed and the rotation of the photosensitive member 5 is stopped and the energization to the solenoid (not shown) is stopped, the blade support member 12 is rotated in the direction of the arrow 54 as described above.
At that time, the coil spring 4 hung on pins 16 and 45
6, a link 40 is drawn as shown by the double chain line,
Support member.

It is brought into contact with no surface. Even if the position of the pin 16 is further rotated, since the support member 35 is suspended by the stop pin 42, the coil spring 46 is extended and the pin 16 moves downward in the elongated hole 44, and the overall movement is smooth. When you perform a movement, you can make a toe. Therefore, since the shielding film 11 is configured to come into contact with the photosensitive member 5 before the edge portion 23a of the first film 23 rubs against the blade 9, the scattered toner leaks from the toner removing device 1. Never. Further, the shielding film 11 is retracted from the photosensitive member 5 immediately before the blade 9 comes into contact with the photosensitive member 5 during the toner removal operation.

As described above, according to this embodiment, when the toner removal by the blade 9 is completed, the toner support member rotates clockwise.
The first film 23 covers the back surface 10a of the blade 9.
The film 33 is obtained by rubbing the surface 10b of the blade 9, respectively, and can prolong the life of the photosensitive member 5, and furthermore can prevent toner from leaking from the apparatus.

〔Effect of the invention〕

As described above, according to the present invention, a film is used to rub the surfaces on both sides of the edge portion of a blade of a toner removing device that removes deposits such as toner remaining on the surface of a photosensitive member such as an electronic copying device. Therefore, deposits can be reliably removed from the blade surface, and copies or prints of good image quality can be obtained permanently.

[Brief explanation of drawings]

FIG. 1 is a side cross-sectional view showing one embodiment of the toner removing device according to the present invention, and FIGS. 2, 3, and 4 are side views of main parts each illustrating the operation of the embodiment of FIG. 1. FIG. 1... Toner removal device, 5... Photosensitive member, 8, 11
... Shielding film, 9... Blade, 10a...
Back surface, 10b... Front surface, 12... Blade support member, 20... Movable plate, 23... First film, 25
, 32° 46... Spring member, 28... Rotating member, 3
3... Second film, 35... Supporting member, 40...
...Link, 48...Toner.

Claims (1)

[Scope of Claims] 1. In a toner removing device that uses a blade to remove deposits such as toner remaining on the surface of a photosensitive member of an electronic copying device, the blade is supported at one end and is rotatable to the main body of the toner removing device. a movable plate having one end rotatably supported by the blade supporting member and a first film provided at the other end so as to be able to rub against the back surface of the blade in the thickness direction; a rotary member having a second film at a lower end so as to be able to rub against the surface of the blade and rotatably supported by the main body of the toner removing device; and a spring member that urges the movable plate in the direction of the blade. is suspended between one end of the blade supporting member opposite to the one end supporting the blade, and one end of the rotating member opposite to the one end supporting the blade; a spring member that is urged into contact with the photosensitive member, and almost at the same time as the blade is separated from the surface of the photosensitive member, the back and front surfaces of the blade in the thickness direction are rubbed by the first and second films, respectively. A toner removal device characterized by: 2. between the toner removing device and the outer periphery of the photosensitive member;
The toner removing device according to claim 1, further comprising a shielding film that can come into contact with and separate from the outer periphery of the photosensitive member via a link mechanism that elastically engages with the blade support member. .