JPS63249872A - Electrophotographic recorder - Google Patents

Abstract

PURPOSE:To easily integrate a separating claw into a narrow space by allowing an operation of press-contacting and release of the separating separating claw for separating a transfer material from a photosensitive body to interlock with a press-contacting and release mechanism of a cleaner blade. CONSTITUTION:In a state that a cleaner blade 47 has been pressed against the peripheral surface of a photosensitive drum 40, a separating claw 80 is turned counterclockwise freely and set to a state that it has abutted on the peripheral surface of the photosensitive drum 40 by a load of a weight 82. Also, at a state that the photosensitive drum 40 goes into a rotational cycle for forming the next toner image, a shaft S is rotated by a prescribed angle counterclockwise and held. Accordingly, the cleaner blade 47 is withdrawn counterclockwise by using the shape S as a supporting point against energizing of a tension spring 49 and separates the tip from the peripheral surface of the photosensitive drum 40, and simultaneously, rotates a connecting shaft 71 counterclockwise abuts it on the separating claw 80, rotates clockwise against a load of the weight 82 and allows the claw tip to withdraw and separate from the peripheral surface of the photosensitive drum 40. In such a way, the separating claw 80 and be brought to press-contacting and release without necessitating a large space.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an electrophotographic recording device, and in particular, to an electrophotographic recording device that forms multicolor toner images in layers on a photoconductor and then transfers the images onto a transfer material such as transfer paper. The present invention relates to an electrophotographic recording device that performs transfer and fixing.

[Conventional technology]

Normally, a recording device is configured to form a toner image of the document on the surface of the photoreceptor drum during one busy cycle, and then transfer the toner image to a transfer material to complete copying. The separation claw for peeling off the transfer material is set so that it is always in pressure contact with the drum surface at a position upstream of the retractor just before the cleaning device, or a driving section is provided so that the separation claw comes into contact only when the transfer material reaches the leading edge. It is configured.

However, in a recording device such as a color electrophotographic recording device that completes a toner image on the drum circumferential surface by multiple cycles of the photoreceptor drum, separated water is removed from the drum circumferential surface during formation of the toner image so as not to damage the image. Since it is necessary to retract the separation claw, a separating claw is used which has a separate drive unit for the separation claw and has a function of pressing or releasing the pressure in synchronization with the rotational speed of the photosensitive drum.

[Problem that the invention seeks to solve]

In this way, a solenoid or the like is used as a driving means to switch the separating claw to the pressure contact state or the pressure release state, but as is well known (a transfer material conveying device is located at the bottom of the cleaning device, and the space between the two is Because of the narrow space, it is difficult to arrange such an independent driving means, and the construction is therefore complicated, which does not reduce the cost.

The present invention has been made by focusing on the fact that a cleaning device with a built-in pressure release mechanism for the cleaner blade is used for the same purpose in power cleaning devices, and as a result of solving and improving this point, an independent The object of the present invention is to provide an electrophotographic recording device that does not require a driving means, can be easily installed in a narrow space, and is inexpensive, and is equipped with a separating claw that can be pressed and released.

[Means for solving problems]

The above purpose is to form overlapping toner images on the photoreceptor,
An electrophotographic recording device configured to transfer the above onto a transfer material, characterized in that the operation of pressing and releasing a separation claw that separates the transfer material from a photoreceptor is linked to a pressure release mechanism of a cleaner blade. Achieved by photographic recording equipment.

〔Example〕 An embodiment of the present invention is shown in FIGS. 1-3.

1 and 2 are front views showing the structure of the separating claw provided in the electrophotographic recording device of the present invention, and FIG. 3 shows the overall structure of the device. The image is shaped r&.

In FIG. 3, A is a reading unit, B is a writing unit, C is an image forming section, and D is a paper feeding section.

In reading (elm) A, 1 is a platen glass, and an original 2 is placed on this platen glass 1. Hara M2 is
It is illuminated by fluorescent lamps 5 and 6 provided on a carriage 4 that moves on a slide rail 3. The movable mirror unit 8 is provided with mirrors 9 and 9', which move on the slide rail 3 and move toward the first mirror provided on the carriage 4.
Original 2 on Platen Plus 1 in combination with Mirror 7
The optical image is guided to a lens reader (reader) 20.

The carry horn 4 and the movable mirror unit 8 are driven by a stepping motor 10 via a wire 15.
711.12 and 13.14, respectively ■ and 17
They are driven in the same direction at a speed of 2. Standard white plates 16 and 17 are provided on the back side of both ends of the platen glass 1, and are configured so that a standard white signal can be obtained before the document reading scan starts and after the scan ends.

lens reader) 20 is lens 21, prism 2
2. First reading board 24, red channel (hereinafter referred to as
R-eb) CDD 25, second reading number board 26
, a cyan channel (hereinafter referred to as C-ah) CC port 27. The original optical image transmitted by the first mirror 7, mirror 9, and mirror 9' is focused by the lens 21, and is separated into an R-eb image and a C-ef image by the guichroic mirror provided in the prism 22. , 1st
R-cl+ CCD 2 provided on the reading board 24
5 and C-ah C provided on the second reading number board 26
Each of the light receiving surfaces of the CD 27 is imaged.

The fluorescent lamps 5 and 6 are commercially available warm white fluorescent lamps to prevent emphasis or attenuation of specific colors depending on the light source when reading color documents, and 40K fluorescent lamps are used to prevent flickering.
It is lit by a high frequency power source of Hz and is kept warm by a Bonostar heater to maintain a constant temperature of the tube wall or to increase the ohm.

The R-cl+ CCD 25 and C-ah CCD
The image signal output from 27 is J! ! The signal is processed in the section. In the signal processing section, color signals separated according to the toner color are output and sent to the writing unit).
It is input to B.

In writing unit) B, a laser beam generated by a semiconductor laser is rotated and scanned by a polygon mirror 32 rotated by a drive motor 30, passes through an Fθ lens 36, and its optical path is bent by a reflection value 37 to produce a photosensitive material that is a large phase carrier. It is projected onto the surface of the body drum 4o to form an ll1I line.

When scanning begins, the beam is detected by the index sensor and modulation of the beam by the first color signal begins. The modulated beam scans the photosensitive drum 40, which has been uniformly charged in advance by a charger 41. A latent image corresponding to the first color is formed on the drum surface by the main scanning by the laser beam and the sub-scanning by the rotation of the photosensitive drum 40.

This latent image is developed by a developing device 42 loaded with red toner, for example, to form a red toner image on the drum surface. The obtained toner image, while being held on the drum surface, passes under the separation claw 80 of the cleaner blade 47, which has already been released from the photosensitive drum surface, and enters the next copy cycle. The photosensitive drum 40 is charged again by the charger 41.

Next, the second color signal output from the signal processing section is input to the writing unit) B, and in the same manner as the first color signal, IF insertion is performed on the drum surface to form a latent image. Ru. The latent image is developed by a developer 43 loaded with toner of a second color, for example blue. This blue toner image is formed over the already formed red toner image.

A developing device 44 has black toner, and forms a black toner image on the drum surface based on a control signal generated by a signal processing section. Alternating current and direct current biases are applied to the sleeves of these developing units 42, 43, and 44 to perform jumping development using two-component toner, and non-contact development is performed on the grounded photosensitive drum 40.

(When a color toner image is synthesized using the three color toners, the paper feed cassette 61 is
The recording paper is fed through the carry-out roller 62 and the paper feed roller 63, and the cleaner blade 47 and the separation claw 80 move the photosensitive drum 40 slightly before the leading edge of the recording paper reaches the separation claw position. Pressed against the surrounding surface.

As a result, the recording paper receives the transfer of the toner image at the transfer pole 50 and is separated by the static elimination action of the separation pole 51. However, for the recording paper with poor separation, the toner image is transferred to the transfer pole 50. It is separated from the circumferential surface of the drum by the mechanical peeling action of the separating claw 80 and is conveyed to the fixing device 52 .

- The photosensitive drum 40 from which the recording paper has been separated is cleaned by removing residual toner on its peripheral surface by the cleaner blade 47 and enters the next image forming cycle.

1 and 2 show an operating mechanism for bringing the cleaner blade 47 and the separation claw 80 into pressure contact with the circumferential surface of the photosensitive drum 40 and releasing the pressure contact.

The cleaner blade 4) is sandwiched and held by a blade holder 48 that is integral with a shaft S, which is supported on the front and rear walls of the cleaning container 46, and is held in place by the blade holder 48 when image transfer is started. Due to the action of a tension spring 49 stretched between the inner wall of the cleaning container 46, it is urged to rotate clockwise about the shaft 7)S as a fulcrum, and presses against the circumferential surface of the photoreceptor drum 40 and holds its tip. It is designed to clean residual toner.

In addition, the shutter 7)S has a pair of release levers 70 integrally supported and fixed via a connecting shaft 71 to respective portions of the front and rear walls of the cleaning container 46 that protrude. The connection shaft 71 is configured to be able to be rotated by a person through the cleaner blade 4.

A plurality of separation claws 80 are arranged at predetermined intervals on a support shaft 81 installed between the front and rear device boards that support the photosensitive drum 40, and the separation claws 80 are separated by the load of a weight 82 attached to each of them. It is biased counterclockwise using the support shaft 81 as a fulcrum, and its toes are brought into pressure contact with the circumferential surface of the photosensitive drum 40 to peel off the transfer material to which the image has been transferred.

Note that when the cleaner blade 47 is in pressure contact with the circumferential surface of the photoreceptor drum 40, the connecting shaft 1 does not come into contact with any of the separating claws 80 and is kept at a position a little apart from the above. The separation claws 80 are each freely rotated counterclockwise and brought into contact with the circumferential surface of the photoreceptor drum 40 with a preset pressing force. Figure #11 shows this state.

When the photosensitive drum 40, which has thus separated the transfer material and cleaned the residual toner, enters the next rotation cycle for toner image formation, the rotary lens (not shown) that drives the photosensitive drum 7) is activated. It is rotated counterclockwise by a predetermined angle and held at the angle shown in FIG.

Therefore, the cleaner blade 47 resists the bias of the tension spring 49 and retreats counterclockwise around the shaft 7)S as a fulcrum, thereby separating its tip from the circumferential surface of the photoreceptor drum 40 and at the same time releasing the connecting shaft 71. By rotating counterclockwise, each separation claw 80 is brought into contact with the separation claw 80, and each separation claw 80 is brought into contact with the weight 82.
The toe is turned clockwise against the load of the photoreceptor drum 40 to retract and separate it from the circumferential surface of the photoreceptor drum 40.

Since the operation of the rotary lenoid is continued during the formation of the toner image, the photosensitive drum 40 is not pressed by the separating claw 80, not to mention the cleaner blade 47, so that an undamaged toner II image can be synthesized. It becomes possible. Furthermore, it is possible to construct the separation claw 80 and the cleaner blade 47 by making contact or pressure contact with the photosensitive drum 40 and releasing them not at the same time, but with a slight time lag.

〔Effect of the invention〕

According to the present invention, it is possible to release the separation claw that is pressed against the photoreceptor drum using an extremely simple member without requiring a large space, and there is no need for a power mechanism for driving the separation claw, which was conventionally provided separately. The control system has also been simplified, resulting in the provision of an inexpensive and compact electrophotographic recording device with fewer causes of failure.

[Brief explanation of drawings]

FIG. 11 and FIG. 2 are main part sectional views showing two embodiments of the recording apparatus of the present invention. FIG. 3 is an overall configuration diagram of the device. 40... Photosensitive drum 47... Cleaner blade 48... Blade holder 49... Tension spring 70... Release lever 7J... Connection shaft 80.
...Separation claw 82...ffi weight S...shaft Applicant Konishiroku Photo Industry Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] In an electrophotographic recording device that forms toner images in layers on a photoreceptor and then transfers them onto a transfer material, a cleaner blade is used to press and release a separation claw that separates the transfer material from the photoreceptor. An electrophotographic recording device characterized in that it is linked to a pressure release mechanism.