JPS5977450A - Transfer type copying machine - Google Patents

Abstract

PURPOSE:To handle a jam easily and speedily by such a constitution that a photosensitive drum and a transfer means are isolated from each other, by opening the 1st and the 2nd bodies along the part where a transfer material conveyance path faces the photosensitive drum. CONSTITUTION:The copying machine is divided into the 1st body 137 (rear main body) and the 2nd main body (part except the rear main body 137); and the 2nd main body side is provided with the photosensitive drum 6 facing the transfer material conveyance path, and the 1st main body side 137 is provided with a transfer means 82 facing the transfer material conveyance path. The 1st main body 137 and the 2nd main body are separated along the part where the transfer material conveyance path faces the photosensitive drum 6 to handle a jam easily and speedily.

Description

[Detailed description of the invention] The present invention relates to a transfer type copying device.

Conventionally, in transfer-type electrophotographic apparatuses, the transfer material often jams at the separation means.

Once a jam occurs, it is extremely difficult to remove the jammed transfer material because the transfer type copying device has a complicated structure. Furthermore, when removing the jammed transfer material, there is a risk of damaging the surface of the image carrier.

The present invention includes a transfer means, and a transfer material that is tensioned along the transfer means between the image carrier and the transfer means on the image carrier side of the transfer material over the transfer area of the transfer means, and the image on the image carrier. While transferring the image from the image carrier to the transfer material by the transfer means, the end of the transfer material outside the image area is isolated from the surface of the image carrier, and after the transfer, the transfer material that is pinched and separated and guided is the image carrier. By separating the belt-shaped separation belt that separates and guides the image carrier in the direction away from the image carrier, the jammed transfer material can be handled extremely easily and quickly without damaging the surface of the image carrier. It is an object of the present invention to solve the problems of the conventional device by making it possible to do the following.

That is, the present invention, which achieves the above object, has a structure in which a first support member and a second support member can be opened in a transfer type copying device, an image carrier is provided on the first support member, and an image carrier is provided on the first support member, and an image carrier is provided on the first support member. A transfer device faces the image carrier and transfers the image on the image carrier to a transfer material, and a transfer device is provided between the image carrier and the transfer device on the image carrier side of the transfer material over the transfer area of the transfer device. It is tensioned along the transfer means, and while the image on the image carrier is transferred from the image carrier to the υ transfer material by the transfer means, the end of the transfer material outside the image area is placed on the surface of the image carrier. and a separation belt that separates and guides the transfer material that is pinched and separated after transfer in a direction away from the image carrier, and connects the first support and the second support to the image carrier and the separation belt. This transfer type copying apparatus is characterized in that it is configured to be opened between.

As a result, the present invention can obtain the following effects.

(1) First, the present invention allows jammed transfer material to be removed from the main body of the apparatus without damaging the surface of the image carrier in an electronic quintuple transfer apparatus.

That is, the present invention provides a structure in which the first support body and the second support body can be opened, and then a second support body separate from the image bearing body is provided.
In combination with the provision of the separation belt having the above structure on the support, when the first support and the second support are opened, the jammed transfer material remains on the second support, so that the image carrier is Remove jammed transfer material from the device without damaging the surface.
It can be removed.

A detailed explanation will be given below in comparison with a conventional device.

First, with conventional devices, when transfer material becomes clogged near the drum, open the front door (on the operator's side) of the copying machine and clear a small space, being careful not to touch the photoreceptor or the rotary process means. The jammed transfer material had to be removed from the side of the copying machine by moving it in the axial direction of the photoreceptor. Therefore, it is troublesome to clear the jam, and there is a risk of damaging the photoreceptor.Also, if the transfer material comes into contact with the surface of the photoreceptor and becomes jammed, the photoreceptor drum must be moved in the axial direction and removed from the copying machine. At this time, the transfer material and the circumferential surface of the photoreceptor would be pulled out while rubbing against each other, and there was a risk of damaging the surface of the photoreceptor.

However, in the present invention, as described above, the first support body and the second support body are configured to be openable, and the separation belt having the above structure is further provided. When the image carrier and the separation belt are opened, the transfer material jammed in the transfer area is prevented from moving toward the image carrier by the separation belt and remains on the second support.

Therefore, in the present invention, since the jammed transfer material can be removed from the second support body where the image bearing member is not provided, there is no need for the jammed transfer material to rub against the surface of the image bearing member. This means that the jammed transfer material can be removed from the main body of the apparatus without damaging the surface of the image carrier.

Moreover, in the present invention, when both support members are opened, the υ transfer material is tensioned over the transfer area and along the transfer means, and the image on the image carrier is transferred from the image carrier to the transfer member. During transfer to the image carrier, a band-shaped separation belt that separates the edge of the transfer material outside the image area from the surface of the image carrier prevents the jammed transfer material from moving toward the image carrier, so the transfer material is not easily anchored. In fact, it remains on the second support side.

Furthermore, in the present invention, the above structure allows the υ transfer means and the separation belt to be integrally separated from the image carrier by a large distance, so that when removing the jammed transfer material, the transfer material can be used to surface the image carrier. Since there is no need to rub the surface of the image carrier or touch the surface of the image carrier with your hands, jam processing can be performed without damaging the surface of the image carrier.

(In addition, the present invention allows jam removal to be easily and quickly performed in a transfer type electrophotographic apparatus.

In transfer-type electrophotographic devices, the transfer material often jams at the separation means. That is, the transfer type electrophotographic apparatus separates the transfer material onto which the image on the image carrier has been transferred from the image carrier, but this separation may not be successful and the transfer material may jam. Once a jam occurs, it is extremely difficult to remove the jammed transfer material because the transfer type electrophotographic apparatus has a complicated structure.

However, in the present invention, the first support is provided with an image carrier,
The second support includes a transfer means that faces the image carrier and transfers the image on the image carrier to the transfer material, and an image carrier and the transfer means on the image carrier side of the transfer material over the transfer area of the transfer means. A belt-shaped separation belt is provided between the image carrier and the separation belt to separate and guide the transferred transfer material in a direction away from the image carrier. Since the image bearing member and the separation belt can be separated by a large distance, jams that occur in the transfer area can be disposed of very easily and quickly. (In addition, the present invention allows the transfer means and the separation belt to be separated from the image carrier at the same time by simply opening the first support and the second support. This also improves the operability of jam removal. can be improved.

The present invention achieves the above effects.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An illustrated example of the present invention will be specifically described below with reference to FIGS. 1-2-5 and 4, together with a copying machine according to an embodiment to which the present invention can be applied. FIG. 1 shows a perspective view of the exterior. In the figure, when a sheet-shaped original is inserted through the original insertion slot 2 in the center of the machine case 1, the original is ejected to the original receiving tray, and the copy is ejected from the opening 4 to the receiving tray 5. Further, a photosensitive layer 7 having a photoconductive layer between a surface insulating layer and a conductive or insulating film is laminated on the surface of the rotating drum 6 in the machine box 1 to constitute a photosensitive drum, and is rotated in the direction of the arrow.

Then, on the circumferential surface, a negative charger 8, an exposure simultaneous discharge section 9,
A full surface exposure device 10, a developing device 11, a tertiary charger 12, a transfer section 16, and a cleaning section 14 are arranged in this order.

Direct current corona discharge is applied to the primary band capacitor 8, and the photoreceptor 7 on the surface of the drum 6 is uniformly charged positively or negatively.

At the exposure/charging position 9, a direct current corona discharge or an alternating current corona discharge of opposite polarity to the -order charging is applied to the photoreceptor 7, and at the same time, a light beam or radiation pattern of the original to be copied is exposed onto the photoreceptor drum. An electrostatic latent image is formed on the photosensitive drum.

Next, by uniformly irradiating the electrostatic latent image on the photoreceptor with a full-surface irradiator 10 such as a fluorescent light, the acting force as an external field is increased, and the electrostatic latent image with high contrast is The image is printed onto the surface of the photoreceptor drum. That latent image,
The developing device 11 develops the latent image into a positive image using toner having a polarity opposite to that of the latent image charge, or a negative image using toner having the same polarity as the latent image. For development, a fur brush method or a magnetic brush method can be used.

Although the tertiary charger 12 is not necessarily required,
It is used with arbitrary polarity in order to improve the transfer efficiency of the above powder image onto the transfer material (usually paper) P. The powder image is electrostatically transferred to a transfer material at a transfer position 15. After image transfer, the photosensitive drum is cleaned by wiping off residual toner on its circumferential surface with a roller 15 at a cleaning position 14.

In addition to the peripheral devices 8 to 15 for the photosensitive drum 60, the photosensitive drum 60 includes a document transport section, an exposure optical system, a transfer paper feed section, a transfer paper turning section, a fixed attachment section, and the like.

Each part will be explained in detail below.

The conveyor rollers 216 to 19, conveyor guide plates 20 to 24, document conveyance changing pieces 25, exposure plate glasses 26 and 27, illumination light source 28, and control switches MSI and MS2 are configured for conveying sheet documents inserted into the document conveyor opening 2. Ru.

A document (such as a promissory note) O is inserted into the document insertion slot 2 with the side to be copied facing upward. The original O is conveyed by the conveyor roller 16.16 which constantly rotates in the direction of the arrow, and presses the actuating piece 29 of the control switch MS1.

This control switch MS1 starts driving the photosensitive drum roller and a control device (not shown) interlocked therewith, and starts driving the entire apparatus.

The original O is further fed by the transport rollers 17, 17,
Press the actuating piece 51 of the control switch MS2.

This control switch MS2 operates the document conveyance changing piece 25 as described later to control repeated copying of the document. The traveling direction of the original O is changed by the conveyance guide plates 22 and 23, and the document O is sent to the slit exposure position by the conveyance rollers 18 and 18. [The light position is composed of a transparent plate glass 27 with a gap necessary for the document to pass through and a guide plate glass 26. An illumination light source 2B is provided below the lower transparent plate glass 27, and a cylindrical lens 62 is used to illuminate the transparent plate glass. The light is focused on 27 slit illumination sections.

The original O that has passed through the slit exposure position is moved to the rollers 19 and 1.
9. At this time, if the conveyance change guide plate 25 is tilted downward (not shown), the document is guided to the external receiver 6, and the conveyance change guide plate 25 is at the solid line position IL'I- in FIG. In this case, the original is on the conveyance change guide plate 25.
As a result, the route is changed and the vehicle circulates, during which the control switch MS2 is operated again.

For example, if you take a promissory note as a document and place it in landscape orientation,
When the same image is copied to two places on the same paper (transfer material) P, the original passes through the exposure section twice and is sent out. The number of repetitions is determined by a control switch MS2 and a change control device (not shown). That is, by the first actuation of the control switch MS2, the conveyance change piece 25 is circulated by the change control device from the downwardly tilted state to the solid line state to prevent the original from being ejected to the outside. In response to the next signal, the conveyance change plate 25 is returned to its initial state by the change control device υ, and the document is taken out to the external document receiver 6.

Note that the above-mentioned change in the conveyance of the original O is performed by a control mechanism (not shown).
The detailed explanation will be omitted.

Optical exposure section system The optical exposure section system is housed in an independent dustproof chamber 52 at the bottom of the bottom plate 51 of the main machine box, and the bottom plate 51 is provided with openings 55 and 54 that communicate with the document exposure section and the charging exposure section 9. By sealing this with transparent members 55 and 56, it is completely isolated from the upper device chambers. Therefore, it is necessary to prevent the lens 57, reflecting mirrors 58, 59, etc. from being contaminated by developer powder, etc., and to facilitate optical adjustment during assembly and periodic cleaning and maintenance of the optical system. Configure.

52' indicates a double case for protecting the optical system.

The original image illuminated in the original transport/exposure section 26, 27 is projected onto the photosensitive drum 6 by reflecting mirrors 58, 59 and a lens 57 through a charging exposure device.

The electrophotographic processing unit photosensitive drum 6 starts rotating when the original O acts on the control switch MS'l, and a primary charger 8, a secondary discharger 60, and a tertiary charger 12 are installed along the surface generatrix direction. The photosensitive drum is uniformly irradiated with a fluorescent light 10 that does not produce an electrostatic latent image on the photosensitive member 7 of the photosensitive drum 6, and a high-contrast latent image is formed. Sur.

As shown in FIG. 5, the developing device includes roller-shaped developing fur brushes 61 and 62, a cover removal fur brush 65,
It is composed of a toner powder transmission brush 64, a toner powder unquantified supply roller 65, and a toner powder supply inspection item.

The toner powder is injected into the supply tank 66 between the holes of the knurling (not shown) on the circumferential surface of the metering supply roller 65, is scraped by a metering blade (not shown), and is conveyed by a certain amount. The transfer brush 64 takes up the receiver, and the receiver is passed to the developing fur brush rollers 61, 62, and the electrostatic latent image on the photosensitive drum is developed and visualized by the developing rollers 61, 62.

The developed visible image is moved to the next step after excess toner powder causing fog is removed by a fog remover υ fur brush 63. The removed powder toner is transferred to the brush 62.
64 and used again. The toner that has fallen from the rollers 64-65 and the like is removed from the tray (not shown) by pulling it out with a knob (not shown) at any time. Furthermore, the developing effect can be increased by applying a bias voltage to the developing fur brushes 61 and 62 and the fog removing brush 65, respectively.

As for the developing method, in addition to the fur brush method shown in the figure, a magnetic brush method can also be used to achieve a good developing effect. In addition, the mounting stand and developer box are equipped with a double lever mechanism.
, it is possible to move the entire developing device closer to or away from the photosensitive drum B by performing parallel up and down movements. Also, the mounting base 75 can be easily attached.
It is attached and detached.

The transfer roller 82 is made of a conductive rubber roller having an appropriate hardness and is grounded.

Transfer paper feeding section/transfer section/fixing section The transfer paper P on the paper feeding table 86 is rotated by a signal from a control device (not shown) controlled by a control switch MSl of the paper feeding row'y84. , one sheet will be sent out. Then, the second conveying rollers 87, 87 are
transported to. Since the roller 87 is initially stopped,
The transfer paper P' is deflected as shown by the two-dot chain line, and is aligned parallel to the axis of the row 287 at the leading end. The second row 287 starts rotating in response to a signal from a control device (not shown), and the transfer paper P' is conveyed to the transfer section so as to match the powder image area of the photosensitive drum. It is evenly pressed and the powder image on the photosensitive drum is transferred.

The transfer paper that has passed through the transfer drum 82 is transferred to the transfer drum 82, which is slightly longer than the photosensitive drum 6, as shown in FIG. The side edge of the transfer paper is sandwiched between the transfer drum 82 and the photosensitive drum by a separation bell (separation bell) 90 suspended from
2 and guided to the fixing section by a separation claw 92 that lightly contacts the transfer roller 82. Of course, the separation member 9o may be one that rotates endlessly.

The fixing section is a wire mesh belt 9 that constantly moves and rotates in the direction of the arrow.
5. The powder image is constantly maintained at a constant temperature using an infrared lamp 94, a reflective surface 95, etc., and the powder image is melted and fixed onto the transfer paper P, making it permanently visible.

Permanently visualized copies must be placed on the delivery row 296.97
The copy is then sent to the copy receiver 5.

Cleaning section The photosensitive drum which has transferred the powder image onto the transfer paper is wiped of the toner adhering to it by the cleaning o-') 15 which is formed into a knurled comb on its circumferential surface, and the photosensitive drum 215 rotates in its axial direction. The toner is wiped off by a belt brush (not shown), and the toner is stored in a lower storage bag or storage box.

In the cleaning device 14, a mounting leg 101 is rotatably supported on the main body by a shaft 102, an upper lug 105 is loosely fitted into a cleaning bin 104 erected on the machine frame 1o4', and a spring 105 is used to attach the photosensitive drum 6 to the cleaning device 14. Cleaning row 21 with a constant appropriate pressure
Crimp 5. The power goes through gears, etc. for cleaning!
:1-115 is driven, and a belt brush (not shown) is driven by transmission of drive from a gear shaft to a chain or other gear (not shown).

When the other mechanism control switch MS1 is operated, an electromagnetic clutch (not shown) is activated to drive the photosensitive drum 6, and a camshaft (not shown) also starts rotating, and the cam group and switch group actuate the υ copying device. It controls the

The photosensitive drum 6 needs to be replaced due to long-term use or cleaning. Therefore, the photosensitive drum needs to have a structure that not only makes it easy to remove it from the apparatus, but also makes it easy to manufacture the photosensitive drum.

Therefore, the rear main body 137 shown in the second figure is removed using the removal tool 13B.
Loosen the shaft 102 (in the illustrated example, it is common to the support shaft of the cleaning section 14) and open it as shown by the chain line in FIG.
The shaft 117, both sides, the electromagnetic clutch, and the bearing can be removed together with the open groove at one end of the side plate of the central body.

The photosensitive drum 6 is composed of a support disc integral with the shaft 117, a body fixed to the support disc with a set screw, and end plates screwed to both ends of the support disc. Then, the photoreceptor 7 having an insulating film is wound around the cylinder, and both ends of the photoreceptor 7 are inserted between the cylinder and the edge plate and tightened by the threaded portion of the end plate.

Furthermore, as shown in FIG. 2, the support frame 147 of the transfer device section is attached to the rear main body 167, and the cleaning section is also supported so that these devices can be opened and separated from the main body side, and the photosensitive drum 6
Since it is made to be removable, inspection and repair of internal devices such as the chargers 8, 60, 12, the entire surface exposure device 10, the developing device 11, and the like, checking and adjusting the operating state can be easily and reliably performed.

The front part 149 of the main box is connected to the joining line 148 in FIGS. 2 and 6.
It is convenient for inspection and maintenance if the central part is separated from the main body box from the position and can be pulled out to the front, and the document feed mechanism, paper feed table, etc. are built-in. The transfer paper P is fed to the paper feed table 86 by moving the copy receiver 5 to the shaft 5. Open it and do it.

FIG. 2 shows an example of how each part is driven, from the motor M to the original conveyance shaft 150, copy feed rollers 97, 9
6. The shafts 151, 152 leading to the conveyor 95, the shaft 15'5 leading to the transfer paper conveying rollers 86, 87, the shaft 154 leading to the transfer paper separation belt 90, etc. are driven by a common belt 155 (or chain).

156 in FIG. 6 is a power supply box 157 at the bottom of the optical system chamber 52;
A transfer paper box 158 and other accessories storage chamber is shown.

As described above, the electrophotographic apparatus of this embodiment has a primary charging device, a secondary discharge simultaneous exposure device, a full surface exposure device, a developing section, a tertiary exposure device if necessary, a transfer section, a cleaning section, etc. for electrophotography on the periphery. The document transport optical device is placed on one side of the photosensitive drum that includes the process section, and the optical system, transfer material feeding device, and transfer fixing device are placed below and above it, respectively, making the overall structure compact. be done. By placing the fixing section on the top stage, other process sections, especially the optical system, are not heated, so heat management is easy and the lens system is sufficiently protected. By housing the optical system in an independent dust-proof chamber, it will not become contaminated with toner or other dust.

The transfer rubber roller is equipped with a transfer material separation belt, and by sandwiching the transferred paper between them and moving it along the transfer roller, the transfer material that is electrostatically attracted to the photosensitive drum is reliably and smoothly separated. be able to.

To clean the photosensitive drum, use a cleaning roller made of rubber, synthetic resin, etc. with knurling as necessary to wipe off the toner, and then wipe off the toner adhering to the cleaning roller with a brush that runs in the direction of its generatrix. Especially υ, the cleaning is completely done with a simple mechanism.

Inspection and repair of the developing device can be easily performed by making the developing device box removably attachable to the mounting base and quickly moving the mounting base toward and away from the photosensitive drum using a parallel link mechanism.

The rear body can be opened and closed with respect to the central body, and when opened, the upper half of the bearing support of the photosensitive drum is opened, so that the photosensitive drum can be easily removed and placed on its circumferential surface. Inspection operations of each process section can be easily and reliably confirmed.

By strategically supporting the transfer roller, separation belt, and cleaning mechanism at the rear thereof, the drum can be smoothly attached and detached.

By configuring both end plates of the photosensitive drum to be removable from the body, wrapping or covering the body with a thin photosensitive plate, and inserting the both ends between the body and the end plate, the drum can be attached to the body. The photosensitive layer can be easily formed on the drum, the photosensitive drum can be obtained at low cost, and the photosensitive layer can be easily replaced.

As described above, the present invention provides a transfer-type electrophotographic device that can extremely easily and quickly process jammed transfer material by integrally separating the transfer means and the separation means from the image carrier. It provides equipment.

4. Claim 1: The copying device has a structure that can be divided into a first main body and a second main body, and the main body side is provided with a document placement part and facing a transfer material conveyance path. A first main body includes a photosensitive drum and an exposure optical system for projecting a document image between the document placing section and the photosensitive drum; a transfer means is provided on the other main body side facing the transfer material conveyance path; A transfer type copying device that can separate a photosensitive drum and a transfer means by relatively opening the second main body and the second main body to a portion of the transfer material conveyance path facing the photosensitive drum.

Applicant Canon Co., Ltd. procedural amendment (voluntary) Commissioner of the Patent Office Kazuo Wakasugi 1 Indication of the case 1981 C1 patent application No. 11050 Bow 2 Name of the invention Transfer type copying device 3 Person making the amendment 1. Related Patent applicant Location East 1; Mitojin 111-ku F Maryo 3-30-2 Name (IQO
) Canon Co., Ltd. 5. Statement subject to amendment 6. The entire text of the statement of contents of the amendment shall be corrected as shown in the attached sheet.

Full text correction specification 1, name of the invention, transfer type copying device 2, brief description of the drawings. Figure 1 is an external perspective view of the copying machine, Figure 2 is a side view of the back of the paper in Figure 1, and Figure 3. is a vertical side view of the copying machine, No. 4
The figure is a front view showing an example of a separation device.

3. Detailed description of the invention The present invention relates to a transfer type copying device.

In transfer type copying apparatuses, the transfer material often gets stuck in the transfer section between the transfer means and the photosensitive drum. When --El jams, it is extremely difficult to remove the jammed transfer material because the transfer type copying device has a complicated structure.

The present invention separates the photosensitive drum and the transfer means to widen the space between them, thereby making it possible to process shirts extremely easily and quickly in the transfer section, thereby improving the efficiency of the conventional apparatus. The purpose is to eliminate the points.

In addition, by configuring the apparatus so that the optical path from the document placement section to the photosensitive drum through the exposure optical system is not interrupted, a high-quality latent image can always be formed on the photosensitive drum. The purpose is to form a clear image at a predetermined position on a transfer material based on this latent image.

In order to achieve the above object, the present invention has a structure in which a copying device can be divided into a first main body and a second main body, and one main body side has a document placement section and a transfer material conveyance path facing the copying device. and an exposure optical system for projecting an original image between the original document placing section and the photosensitive drum, and a transfer means is provided on the other main body side facing the transfer material conveyance path. , the photosensitive drum and the transfer means can be separated from each other by opening the first main body and the second main body relative to each other along the portion of the transfer material conveyance path facing the photosensitive drum. This is a copying device with special features.

As described above, the present invention provides a photosensitive drum facing the transfer material transport path on one main body side, a transfer means facing the transfer material transport path on the other main body side, and a photosensitive drum facing the transfer material transport path. By opening the first body and the second body relative to each other along the portion of the passage facing the photosensitive drum, the photosensitive drum and the transfer means can be separated from each other, and the space between them can be largely opened. Therefore, 1) jams in the transfer section can be disposed of very easily and quickly.

2) Since the document placement section, the photosensitive drum, and the exposure optical system are provided on the same main body side, when the first and second bodies are relatively open, the document placement section passes through the exposure optical system. The optical positional relationship leading to the photosensitive drum is fixed, and the optical path is never interrupted. Therefore, even when the first and second main bodies are opened and closed, there is no focus shift, and a high-quality latent image can always be formed on the photosensitive drum. Based on this latent image, a clear image can be transferred to the transfer material. can be formed at a predetermined location. Furthermore, since the optical path is not interrupted even when the main body is opened, it is possible to prevent dust from entering and adhering to the exposure optical path system.

3) The photoreceptor is provided facing the transfer material transport path, and the copying device main body is opened along the portion of the transfer material transport path facing the t1β light body, so the first main body and the second main body are opened. At this time, the photoreceptor is exposed to the conveyance path.

Therefore, the photoreceptor can be taken out of the copying apparatus while checking its entire width, that is, checking its positional relationship with surrounding processing means. Therefore, the photoreceptor can be easily attached and detached without coming into contact with surrounding process means and without damaging its peripheral surface.

4) Damage to the photoreceptor can be prevented during jam processing.

In other words, with conventional equipment, if transfer material becomes clogged near the drum, the user opens the front door (on the operator's side) of the copier main body and makes use of the small amount of space while being careful not to touch the photoreceptor or surrounding process means. Since the jammed transfer material is removed by moving it in the axial direction of the photoreceptor, it is troublesome to dispose of it and there is a risk of damaging the photoreceptor.

In addition, if the transfer material comes into contact with the surface of the photoreceptor and becomes jammed, the photoreceptor drum must be moved in the axial direction and removed from the copying machine. However, there was a risk that the peripheral surface of the photoreceptor would be damaged.

However, in the present invention, since the main body is opened along the portion of the transfer material conveyance path facing the photoreceptor, when the main body is opened,
The photosensitive drum is exposed to the outside. Therefore, the transfer material wrapped around the photosensitive drum or the transfer material jammed inside the drum can be easily removed and the photosensitive drum will not be damaged. Furthermore, if the transfer material jams inside the photoreceptor, the photosensitive drum can be removed and the jammed transfer material can be easily removed.

The present invention achieves the above effects.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Illustrated examples of the present invention will be specifically described below with reference to FIGS. 1, 2, 6, and 4, along with a copying machine according to an embodiment to which the present invention can be applied. FIG. 1 shows a perspective view of the exterior. In the figure, when a sheet-shaped original is inserted from the original insertion [] 2 in the center of the machine box 1, the original is ejected to the original tray 2, and the copy is ejected from the opening 4 to the tray 5. Further, a photosensitive layer 7 having a photoconductive layer between a surface insulating layer and a conductive or insulating film is laminated on the circumferential surface of a rotating drum B in the machine box 1 to constitute a photosensitive drum, and is rotated in the direction of the arrow.

Then, on the circumferential surface, a negative charger 8, an exposure simultaneous discharge section 9,
A full-surface exposure device 10, a developing device 11, a tertiary charger 12, a transfer section 1, and a cleaning section 14 are arranged in this order.

Direct current corona discharge is applied by the primary charger 8, and the drum 6
The surface of the photoreceptor 7 is uniformly charged positively or negatively.

At the exposure/charging position 9, a direct current corona discharge or an alternating current corona discharge of opposite polarity to the -order charging is applied to the photoreceptor 7, and at the same time, a light beam or radiation pattern of the original to be copied is exposed onto the photoreceptor drum. An electrostatic latent image is formed on the photosensitive drum.

Next, by uniformly irradiating the electrostatic latent image on the photoreceptor with a full-surface irradiator 10 such as a fluorescent light, the acting force as an external field is made uniform, and a high-contrast electrostatic latent image is created. Glue is generated on the surface of the photoreceptor drum. That latent image,
The developing device 11 develops the latent image into a blank image using toner having a polarity opposite to that of the latent image charge, or a negative image using toner having the same polarity as the latent image. A fur brush method or a magnetic brush method can be used for development. Although the tertiary charger 12 is not necessarily required, the photoreceptor 7
It is used with arbitrary polarity in order to improve the transfer efficiency of the above powder image onto the transfer material (usually paper) P. The powder image is electrostatically transferred to a transfer material at a transfer position 13. After image transfer, the photosensitive drum is cleaned by wiping off residual toner on its circumferential surface with a roller 15 at a cleaning position 14.

In addition to the peripheral devices 8 to 15 for the photosensitive drum B, the apparatus includes a document transport section, an exposure optical system, a transfer paper feed section, a transfer paper turning section, a fixing section, and the like.

Each part will be explained in detail below.

Conveyance rollers 16 to 19 for the sheet document inserted into the document conveyance section opening 2, conveyance Z inner plates 20 to 24, document conveyance change piece 25, exposure plate glass 26, 27, illumination light source 28, control switch MS1. Consists of MS2.

A document (eg, a promissory note, etc.) O is inserted into the document insertion slot 2 with the object to be copied facing upward. The original O is conveyed by the conveyance rollers 16, 16, which are constantly rotating in the direction of the arrow, and presses the actuating piece 29 of the control switch MS1.

This control switch MS1 starts driving the photosensitive drum 6 and a control device (not shown) interlocked therewith, and starts driving the entire apparatus.

The document ○ is further fed by the transport rollers 17, 17,
Press the operating side 1 of the control switch MS2.

This control switch MS2 operates the document conveyance changing piece 25 as described later to control repeated copying of the document. The traveling direction of the document 0 is changed by the conveyance guide plates 22 and 23, and the document 0 is sent to the slit exposure position by the conveyance rollers 18 and 18. The slit exposure position is l1 necessary for the document to pass through.
It is composed of a transparent plate glass 27 with an fi gap and a guide plate glass 26, and an illumination light source 28 is provided below the lower transparent plate glass 27, and the light is focused by a cylindrical lens filter 2 onto a slit illumination section on the surface of the transparent plate glass 27.

When the original passes through the slit exposure position, the roller 19.1
9. At this time, if the conveyance change guide plate 25 is tilted downward (not shown), the document is guided to the external receiver 5, and if the conveyance change guide plate 25 is at the solid line position in FIG. According to the conveyance change guide plate 25,
The course is changed and circulated, and in the middle of the cycle, the control switch MS2 is turned on again.
Activate.

For example, if you take a promissory note as a document and place it in landscape orientation,
When the same image is copied to two places on the same paper (transfer material) P, the original passes through the exposure section twice and is sent out. The number of repetitions is from the downward tilted state by the control switch MS2 and the change control device (not shown) to the initial state shown by the solid line, and the document is taken out to the external document receiver 6.

Note that the above-mentioned change in the conveyance of the original O is performed by a control mechanism (not shown).
The detailed explanation will be omitted.

Optical exposure section system The optical exposure section system is housed in an independent dustproof chamber 52 at the bottom of the bottom plate 51 of the main machine box, and the bottom plate 51 is provided with openings 53 and 54 that communicate with the document exposure section and the charging exposure section 9. By sealing this with transparent members 55 and 56, the two parts are completely isolated from each equipment chamber. Therefore, the structure is designed to prevent the lens 57, reflecting mirrors 58, 59, etc. from being contaminated by developer powder, etc., and to facilitate optical adjustment during assembly and periodic cleaning and maintenance of the optical system. do.

52' indicates a double case for protecting the optical system.

The original image illuminated in the original transport/exposure section 26, 27 is projected by reflecting mirrors 58, 59 and a lens 57 onto the photosensitive drum 6 through a charging exposure device.

The electrophotographic processing unit photosensitive drum 6 starts rotating when the original O acts on the control switch MS1, and is provided with a primary charger 8, a secondary discharger 60°, and a tertiary charger 12 along its surface generatrix direction. , simultaneous exposure is performed at the position of the discharger 60, and the photosensitive drum j
A high-contrast latent image is formed on the photosensitive drum 6 by uniformly irradiating the photosensitive drum with a fluorescent light 10 that does not produce an electrostatic latent image.

As shown in FIG. 6, the developing device includes roller-shaped developing fur brushes 61 and 62, a fog removal fur brush 66,
It is composed of a toner powder transfer brush 64, a toner powder non-quantitative supply roller 65, and a toner coating supply tank 66.

The toner powder enters from the supply tank 66 between the holes of the knurling (not shown) on the circumferential surface of the metering supply roller 65, is scraped by the metering blade (not shown), and is conveyed by a certain amount, and then transferred to the transmission brush. 64 takes the receiver, and the receiver is passed to the developing fur brush roller 6L 62, and this developing roller 61, 62
The electrostatic latent image on the photosensitive drum is developed and made visible.

The developed visible image is removed by a fog-removing fur brush 66 to remove excess toner powder that would cause fog, and is then subjected to the next process. The removed powder toner is transferred to the brush 6.
2.64 and is used again. Low 264-6
The toner that has fallen from No. 5 etc. is removed from the tray (not shown) by pulling out the tray with a knob (not shown) at any time. Furthermore, the developing effect can be increased by applying a bias voltage to the developing fur brushes 61 and 62 and the fog removal brush 65, respectively.

As for the developing method, in addition to the fur brush method shown in the figure, a magnetic brush method can also be used to achieve a good developing effect. The mount and the developing device box can be moved up and down by a double lever mechanism to move the entire developing device closer to or away from the photosensitive drum 6. Also, the mounting base 75 can be easily attached.
It is attached and detached.

The transfer roller 82 is made of a conductive rubber roller having an appropriate hardness and is grounded.

Transfer Paper Feeding Unit/Transferring Unit/Fixing Unit The transfer paper P on the paper feed table 86 is rotated by a signal from a control device (not shown) controlled by a control switch MSi of the paper feed roller 84, and is rotated one sheet at a time. sent to. and conveyance roller F36. By E36, the second conveyance rollers 87, 8
It is transported up to 7. Since the roller 87 is initially stopped, the transfer paper P' is deflected as shown by the two-dot chain line, and its tip is aligned with the axis of the roller 87 in a downward direction. The second roller 87 starts rotating in response to a signal from a control device (not shown), and the transfer paper P' is conveyed to the transfer section so as to match the powder image area of the photosensitive drum, and is pressed onto the photosensitive drum B by the transfer roller 82. The powder image on the photosensitive drum is transferred.

The transfer paper after passing through the transfer drum 82 is transferred to a transfer paper provided along one half of the transfer drum 82, which is made slightly longer than the photosensitive drum 6, on one or both sides, as shown in FIG. 91□, 91. The side edge of the transfer paper is held between the transfer drum 82 by a separation bell (suspended on the separation bell) 90, separated from the photosensitive drum, conveyed along the transfer roller 82, and then separated by a separation claw that lightly contacts the transfer roller 282. 92 to the fixing section. Separation member 90
Needless to say, it may be possible to rotate endlessly.

The fixing section is a wire mesh belt 9 that constantly moves and rotates in the direction of the arrow.
It consists of a filter, an infrared lamp 94, a reflective surface 95, etc., and is always kept at a constant temperature, and the powder image is melted and fixed on the transfer paper P to make it permanently visible.

The permanently visualized copy is delivered to the feed roller 96.
At step 97, the copy is sent to the copy receiver 5.

Cleaning section The photosensitive drum 6, which has transferred the powder image to the transfer paper, is wiped of the adhering toner by a cleaning roller 15 whose peripheral surface is made of rubber and knurled, and the roller 15 rotates in its axial direction. (not shown) to wipe off the toner, and the toner is stored in a lower storage bag or storage box.

In the cleaning device 14, a mounting leg 101 is rotatably supported on the main body by a shaft 102, an upper lug 103 is loosely fitted into a screw pin 104 set on a machine frame 104', and a spring 105 is attached to the photosensitive drum 6. Cleaning roller 1 with a constant appropriate pressure
Crimp 5. The power passes through gears and the like to drive the IJ-engaging roller 15, and the belt brush (not shown) is driven by receiving drive power transmitted from the shaft of the gear to a chain or other gear (not shown).

When the other rock groove control switch MS1 is activated, an electromagnetic clutch (not shown) is activated to drive the photosensitive ram, the camshaft (not shown) also starts rotating, and the PM control switch is controlled by the cutter group and the switch group.
It controls the photographic device.

The photosensitive drum 6 requires maintenance such as replacement or cleaning due to long-term use or cleaning.

Therefore, the photosensitive drum needs to have a structure that not only makes it easy to remove it from the apparatus, but also makes it easy to manufacture the photosensitive drum.

Therefore, the rear main body 137 shown in the second figure is removed using the removal tool 1 and 8.
By loosening the shaft 102 (in the illustrated example, it is common to the support shaft of the cleaning section 14) and opening it as shown by the chain line in FIG.
can be removed together with the shaft 117, gears, electromagnetic clutch, and bearing from the open groove at one end of the side plate of the central body.

The photosensitive drum 6 is composed of a support disc integral with the shaft 117, a body fixed to the support disc with a set screw, and end plates screwed to both ends of the support disc. Then, the photoreceptor 7 having an insulating film is wound around the cylinder, and both ends of the photoreceptor 7 are inserted between the cylinder and the edge plate, and the end plate is tightened with a threaded portion.

Furthermore, as shown in FIG. 2, the support frame 147 of the transfer device section is attached to the rear main body 167, and the cleaning section is also supported so that these devices can be opened and separated from the main body side, and the photosensitive drum 6
I made it possible to remove it.

That is, in this embodiment, the copying apparatus is connected to the first main body (the rear main body 16
7) and a second main body (the main body other than the rear main body 1 and 7), a photosensitive drum (6) is provided on the second main body side facing the transfer material conveyance path, and the first main body (Rear body 15
On the 7) side, a transfer means (82) is provided facing the transfer material conveyance path.

Therefore, in the illustrated embodiment, the first main body and the second main body are relatively opened along the portion of the transfer material conveyance path facing the photosensitive drum, so that the photosensitive drum and the transfer means can be separated from each other by a small distance. This is a configuration of a copying device. At this time, in this embodiment, both the document placement section and the exposure optical system are provided on the second main body side.

In addition, the front part 149 of the main body box is located at the joining line 1 in FIGS. 2 and 6.
It is convenient for inspection and maintenance if the central part is separated from the main body box from the position 4B and can be pulled out forward, and if the document feed mechanism, paper feed table, etc. are built in. The transfer paper P is fed to the paper feed tray 8 by opening the shaft 51 of the copy receiver 5.

FIG. 2 shows an example of how each part is driven.
6. Shafts 151, 152 leading to conveyor 9, shaft 153 leading to transfer paper conveyance rollers 86, 87, transfer paper separation bell) 9
A common belt 155 (or chain) drives the shaft 154 and the like leading to zero.

156 in FIG. 6 is a power supply box 157 at the bottom of the optical system chamber 52;
A transfer paper box 158 and other accessories storage chamber is shown.

The electrophotographic apparatus of this embodiment includes 1. - As shown in the figure, the peripheral surface is equipped with various electrophotographic process parts such as a primary charging device, a secondary discharge simultaneous exposure device, a full-surface exposure device, a developing section, and if necessary, a secondary exposure device, a transfer section, a cleaning section, etc. The document transport exposure device is arranged on one side of the photosensitive drum, and the optical system, transfer material feeding device, and transfer fixing device are arranged below and above it, respectively, so that the entire structure is compact. By placing the fixing section at the top, other process sections, especially the optical system, are not heated, so heat management is easy and the lens system is sufficiently protected. By housing the optical system in a dust-proof chamber sealed with German chlorine, it will not be contaminated with toner or other dust.

The transfer rubber roller is equipped with a transfer material separation belt, and by sandwiching the transferred paper between them and moving it along the transfer roller, the transfer material that is electrostatically attracted to the photosensitive drum is reliably and smoothly separated. be able to.

When cleaning the photosensitive drum, the toner is wiped off by a cleaning roller made of rubber, synthetic resin, etc., provided with knurling as necessary, and the toner adhering to the cleaning roller is further wiped off by a brush running in the direction of the generatrix. This allows for complete cleaning with a simple mechanism.

Inspection and repair of the developing device can be easily performed by making the developing device box removably attachable to the mounting base and quickly moving the mounting base toward and away from the photosensitive drum using a parallel link mechanism.

The rear body can be opened and closed with respect to the central body, and when opened, the upper half of the bearing support of the photosensitive drum is opened, so that the photosensitive drum can be easily removed and placed on its circumferential surface. Inspection operations of each process section can be easily and reliably confirmed.

By supporting the transfer roller, separation belt, and cleaning mechanism on the rear machine frame, the drum can be smoothly attached and detached.

By constructing both end plates of the photosensitive drum to be detachable from the body, wrapping or covering the body with a thin photosensitive plate, and inserting the both ends between the body and the end plate, the drum surface can be exposed to light. The layers can be easily formed, the photosensitive drum can be obtained at low cost, and the photosensitive layer can be easily replaced.

As described above, the present invention separates the photosensitive drum from the transfer means by opening the first main body and the second main body relative to each other along the portion of the transfer material conveyance path facing the photosensitive drum. The present invention provides a transfer type copying device that can perform the following functions.

4. Brief description of the drawings Figure 1 is an external perspective view of the copying machine, Figure 2 is a side view of the back of the paper in Figure 1, Figure 6 is a longitudinal side view of the copying machine, and Figure 4 is a side view of the back of the paper in Figure 1.
The figure is a front view showing an example of a separation device.

Applicant: Canon Co., Ltd. 34

Claims (1)

[Scope of Claims] 1. The copying device has a structure that can be divided into a first main body and a second main body, and one main body side has a document placement section and a photosensitive drum provided facing the transfer material conveyance path. and an exposure optical system for projecting an original image between the original document placing section and the photosensitive drum, and a transfer means is provided on the other main body side facing the transfer material conveyance path, and the first main body and the first main body A transfer type copying apparatus that can separate a photosensitive drum and a transfer means by relatively opening the two main bodies along a portion of a transfer material conveyance path facing the photosensitive drum.