JP2505713Y2 - Electrostatic recording device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electrostatic recording device such as a copying machine.

2. Description of the Related Art Generally, a desktop type electrostatic recording device is required to have a compact design, and at the same time, operability and cost are important. Conventionally, a compact design of this type of electrostatic recording device is disclosed in, for example, JP-A-60-12563. This is equipped with a paper feed table that is arranged to be openable and closable in the apparatus main body and forms a part of the apparatus main body cover when closed, and the transfer paper inside the paper feed tray can be opened by opening the transfer paper feed table during copying. The whole is made smaller and lighter so that it can be sequentially supplied and copied.

The problem to be solved by the invention is,
At present, there is a limit to miniaturization. For example, regarding the internal structure, in consideration of downsizing in laying out each process unit that executes the electrostatographic process, a belt-shaped photoconductor is used as in the above publication rather than a drum-shaped photoconductor. It can be said that it is more advantageous. However, according to the configuration of the above-mentioned publication method, a wasteful space is required in the belt, which is one of the causes of the increase in size. In addition, for example, transfer paper may have at least a transport path that relays between the processing units for feeding, transferring, fixing, and discharging, but an extra transport path between these units due to other unit space. In reality, it cannot be made so compact because it cannot be configured without the provision of. For example, when there is a developing unit between the paper feeding unit and the transfer unit, the path must be extended by the developing space (conveyance length).
This is also the case when there is a cleaning unit between the transfer unit and the fixing unit.

Due to such a space, the main body of the apparatus becomes larger than expected, the operability is impaired, the work space is wasted, and it becomes unsatisfactory in many fields.

Means for Solving the Problems After the surface of an endless belt-shaped photoconductor is uniformly charged by a charging means, a document fed and conveyed by a document feeding / conveying means is exposed by an exposure optical system and reflected by the reflected light. An electrostatic latent image is formed on the photoconductor, the electrostatic latent image is visualized by the developing means, and the visualized image is transferred by the transfer means onto the transfer paper fed and conveyed by the transfer paper feeding and conveying means. In the electrostatic recording apparatus in which the image transferred on the transfer paper is fixed by the fixing unit and the surface of the photosensitive member after the transfer is cleaned by the cleaning unit, the endless belt-shaped photosensitive member is vertically moved. Is vertically supported and supported by a plurality of rollers in a state where the distance between the photoconductors is narrowed in the central portion, and an electrostatic latent image is formed on the photoconductor by the charging means, the document feeding / conveying means, and the exposure optical system. hand A step is provided, a cleaning means and a cooling means are provided on one side surface of the photoconductor, a developing means is provided on the other side surface of the photoconductor, and a transfer means and a fixing device are provided under the photoconductor. The means and the transfer paper feeding / conveying means are arranged.

More specifically, for example, an electrostatic latent image forming unit, a cleaning unit, a cooling unit, a transfer unit, a fixing unit, a transfer sheet feeding unit, with an upper side, one side surface and a lower side of a vertically long photosensitive member as an operating side. The transporting means and the developing means are sequentially arranged, and the developing means is arranged on the side surface on the back side when viewed from the operating side of the photoconductor.

Since the endless belt-shaped photoconductor is vertically long and is supported by multiple rollers in a state where the distance between the photoconductors is narrowed at the center, the space volume inside the photoconductor is small. The arrangement space is small, and the selected process units are arranged on the upper side, both side surfaces, and the lower side of the photoconductor, so that the apparatus main body becomes thin and a space-saving design is possible. It is possible to eliminate wasteful space and realize a layout that can improve the operability, jam handling property, etc., that does not lengthen the paper transport path and the like. Furthermore, by disposing a process unit other than the developing unit on the operating side, paper handling during maintenance and the work of attaching and detaching the unit can be facilitated, and the developing unit is located on the back side of the photoconductor when viewed from the operating side. By arranging it, the contamination with the developer is reduced.

Embodiment An embodiment of the present invention will be described with reference to the drawings.

First, the overall schematic configuration and operation will be described with reference to FIGS. FIG. 1 is a sectional structural view showing the outline of the process configuration, and FIG. 2 is a perspective view showing the overall appearance when not in use.
FIG. 3 is a perspective view showing the appearance of the copy processing standby state. The copying machine of the present embodiment is configured as a vertical type / thin copying machine mainly used by leaning against a wall as shown in FIG.

As shown in FIG. 2, the copying machine of the present embodiment has, as shown in FIG. 2, an original conveying table 1 also serving as an outer cover,
Front cover 2, paper feed table 3, left and right side covers 4,
It is surrounded by 5 and the back cover 6. Louvers 7 are provided on the left and right side covers 4 and 5, respectively.

In order to shift from the unused state to the copy processing standby state, first, the handle 8 provided on the upper portion of the outer surface of the document transport table 1 is opened and rotated to the front side as shown in FIG. Open to position. In this opened state, the pair of side guides 9 on the inner surface side of the document transport table 1 are exposed and serve as guides for inserting and setting a document. Both of the pair of side guides 9 are interlocked with each other to move toward and away from each other, so that the side guides 9 can be aligned with the document width. A size mark 10 indicating the size of the original and the position for the center is provided on the innermost side of the original conveying table 1.
Is attached and is used as a guide for inserting and inserting documents. Further, when the document transport table 1 is opened and rotated, the discharge rollers 11 located on the inner surface and the document discharge table 12 that also serves as the document transport cover are exposed as shown in FIG.

When the outer surface of the paper feeding table 3 is pushed, the locking means (described later) is released, and the damper means (described later) provided at the fulcrum portion linearly opens and rotates to a predetermined position as shown in FIG. Fixed open. The paper feed table 3 is for stacking and setting transfer paper sheets to be copied on the front surface thereof, and as with the original document transport table 1, a pair of paper sheets are moved toward and away from each other in conjunction with the paper size to guide the curl of the leading edge of the paper. A side guide 13 is provided. A size mark 14 indicating a sheet size and a center position is provided at a position on the front side of the sheet feeding table 3, and is used as a guide for inserting and setting a transfer sheet. In addition, at the center of the deepest part of the paper feeding table 3, a friction pad facing the calling roller 15 is provided.
16 are provided. When the paper feed table 3 is opened,
An inner cover that is provided on the inner surface of the inner cover and covers the fixing portion and the like.
17 is exposed.

When the document transport table 1 and the paper feed table 3 are opened in this manner, the main power supply of the machine is activated and the standby state is reached in about 20 seconds. Therefore, the operation from the startup to the end of copying will be described with reference to FIG.

As a basic of the electrostatic recording type copying machine, an endless belt-shaped photosensitive member 20 is provided as shown in FIG. 1, and an electrophotographic process is provided around the photosensitive member 20. In accordance with the above, a charging charger (charging means) 21, an exposure optical system 22,
Developing device (developing means) 23, transfer charger (transfer means)
24, a fixing device (fixing means) 25, a cleaning device (cleaning means) 26, and a static elimination LED array 27 are sequentially provided. A document feeding / conveying means 28 is provided above the exposure position by the exposure optical system 22, and a transfer paper feeding / conveying means 29 is provided below the transfer position by the transfer charger 24. In this embodiment, the photoconductor 20 is provided at a substantially central position in the case in a vertically long state in which the interval between the central parts in the belt is narrow, and the process units described above are provided around the photoconductor 20. Are arranged in that order from the bottom to the bottom. Cleaning device
A cooling fan (cooling means) 30 is also provided below 26.

First, when the document transport table 1 is opened and rotated, this opening is detected by the document transport table opening / closing switch 31. Further, when the paper feed table 3 is pushed, the locking means is released, and when the paper feed table 3 is opened semi-automatically by the damper means, this opening is the paper feed table opening / closing switch.
Detected by 32. AND of these open / close switches 31, 32
By taking, the warm-up of this machine is started. Here, the fixing heater 33, the fluorescent lamp heater 34, and the cooling fan 30 complete the warm-up after about 20 seconds. In such a state, a transfer sheet of the same size as the original or the size to be copied is abutted and set on the leading end guide 35 on the paper feeding table 3 with the side guide 13 as a guide. Then, the paper presence / absence sensor 36 provided on the paper feed table 3 is turned on, and the display unit (not shown) indicates that the paper is set. As a result, the copy ready state is set and the system waits for the insertion set of the document.

Therefore, the document is inserted and set on the document transport table 1 with the side guide 9 and the size mark 10 as a guide, facing down from the document surface, and abutted against the pair of document transport rollers 27 and 38. Such a document insertion set is detected by a document presence / absence sensor 39 provided in front of the entrance roller 37. After this detection, the conveyance rollers 37 and 38 are driven after a certain pulse time, and the document conveyance is started. That is, the output of the document presence / absence sensor 39 regulates the drive start time of the transport rollers 37, 38, and this waiting time causes the leading edge of the document to follow the registration rollers. That is, the skew correction time is secured. However, the leading edge of the original is limited to the one that is perpendicular to the conveying direction.

The documents transported by the transport rollers 37 and 38 are
The original is pressed by the original pressing plate 40 and is conveyed backward on the contact glass 41. At the time of this conveyance, the leading edge of the document is a document leading edge detection sensor provided under the contact glass 41.
Detected by 42. In order to detect the leading edge of the document by the sensor 42, a round hole or a notch is formed at a position of the document pressing plate 40 facing the sensor 42.

The exposure optical system 22 is provided on the downstream side of the sensor 42. The exposure optical system 22 includes a fluorescent lamp 43 that exposes an original surface of an original conveyed on the contact glass 41, and a reflector 44 that efficiently reflects a part of the light of the fluorescent lamp 43 onto the original surface.
And a rinse (imaging optical element) 45 for converging and irradiating the photoconductor 20 with the reflected light from the document surface.

On the other hand, the originals inserted and conveyed by the conveying rollers 37 and 38 are succeeded by the pair of conveying rollers 46 and 47 provided on the inner side of the contact glass 41, and the inner glass 4
The sheet is discharged onto the original sheet discharge table 12 by a sheet discharge roller 11 through a reverse conveyance path 50 formed by 8 and the outer guide 49. The outer guide 49 is formed by a part of the back cover 6 and also serves as an exterior cover. These rollers 11,37,3
The document feeding / conveying means 28 is constituted by 8, 46, 47, the reverse conveying path 50, the tables 1 and 12, and the like.

In synchronization with the start of the driving of the photoconductor 20 in conjunction with the drive motor by the detection of the document by the document presence sensor 39,
Transfer charger 24, static elimination LED array 27 and fluorescent lamp 43
Is turned on. The charging charger 21 is turned on at a timing before the position of the photoconductor 20 corresponding to the position where the leading edge of the document reaches the optical axis of the rinse 45 before reaching the position of the charging charger 21 from the start of driving, and the surface of the photoconductor 20 is covered. Uniform charging, that is, a uniform potential is applied.

Then, the rinse 45 causes the light reflected from the document to be reflected on the photoconductor 20.
An electrostatic latent image is formed by forming an image on the surface. The electrostatic latent image is developed by the developing device 23, and the visualized toner image is transferred onto the transfer paper at the position of the transfer charger 24.
After the transfer, the toner remaining on the photoconductor 20 is scraped off by the blade 51 of the cleaning device 26. Further, the residual potential on the surface of the photoconductor 20 is removed by irradiating the static elimination LED array 27 with light.

Here, the photoconductor 20 has a seam, and as shown in FIG. 4, the reflection mark 52 and the developing device 23 provided at the surface end of the photoconductor 20 are prevented so that an image is not formed across the seam position. The seam sensor 53 provided in the lower portion detects the home position of the photoconductor 20 and drives the belt, that is, the drive motor is turned off.

On the other hand, the drive signal is transmitted to the clutch on the paper feed table side in conjunction with the drive motor by the detection signal of the document presence / absence sensor 39, the paper feed solenoid is turned on by the detection signal of the document leading edge detection sensor 42, and the clutch shaft The transfer sheets stacked on the sheet feeding table 3 are fed and conveyed by the sheet feeding roller 55 and the calling roller 15 which are engaged with each other. At this time, the paper feed roller 55
Only the uppermost one of the stacked transfer sheets is separated and conveyed by the friction pad 56 pressed against the sheet. Also, call roller 15
The leading end guide 35 is also displaced downward to the downward retreat position at the timing interlocked with the descending paper feeding operation.

The transfer paper conveyed by the paper feed roller 55 is
It passes through a reversing conveyance path 59 which is composed of 57 and an outer guide 58 and serves as reversing conveyance guide means, and goes to the transfer position of the photoconductor 20 in a reversed state. Here, before the transfer position, the registration roller
60 and a driven roller 61 are provided, and the transfer paper is temporarily stopped at the position of these rollers 60 and 61, and the timing is controlled so as to coincide with the leading edge of the image on the photoconductor 20. That is, the clutch engaged with the shaft of the registration roller 60 works in conjunction with the drive motor in the same way as the drive transmission of the paper feed clutch described above, and the registration roller 60 is detected by the detection signal of the document leading edge detection sensor 42.
Drive is transmitted to and synchronized with the visible image. It is also possible to use the detection signal of the joint sensor 53 as the registration start signal. Further, a sheet presence / absence detection sensor 62 for detecting a jam is provided at a position immediately before the registration roller 60.

The transfer paper conveyed by the registration rollers 60 at a predetermined timing receives the toner image on the photoconductor 20 by the transfer charger 24. After that, the transfer sheet is conveyed while being thermally fixed by the pair of the fixing roller 63 and the pressure roller 64 of the fixing device 25, guided by the peeling claw 65 for peeling, and discharged by the discharge roller 66 to the outside of the machine. That is, the transfer paper feeding / conveying means of this embodiment
The transfer sheet conveying path at 29 includes a sheet feeding path of the sheet feeding means including the sheet feeding table 3, the calling roller 15, the sheet feeding roller 55, and the friction pad 56, an inversion conveying path 59, and a pair of registration roller 60 and driven roller 61. , The transfer path of the transfer charger 24, the pair of fixing roller 63 and pressure roller 64, and the discharge roller 66
The paper ejection path is defined by the above, and the operation side (front side) is set to the paper insertion and paper ejection side, as in the case of the document feeding / conveying means 28.

That is, the reversing conveyance paths 49 and 59 are for reversing and conveying the sheet in the clockwise direction in FIG. 1, and the photoconductor 20 rotated counterclockwise is exposed on the side of the document feeding and conveying device 28 before exposure. On the transfer paper feeding / conveying device 29 side, the moving direction of the original and the transfer paper is made to coincide with the moving direction of the photoconductor at each working position by performing the transfer after reversing. Therefore, all the operations of the original and the transfer sheet can be performed only on the operation side of the apparatus, and the operability is good.

At this time, the discharge detection sensor 67 provided near the discharge roller 66
Jam is detected from the sensor 63 of the resist section using the detection signal of the above, and a signal is given to the seam sensor 53 by the off signal (when the trailing edge passes) to detect the reflection mark 52 on the photoconductor 20 and drive motor. To turn off. The transfer charge 24, the static elimination LED array 27 and the fluorescent lamp 43 are turned off in synchronization with the turning off of the drive motor.

Further, the charger 21 is turned off at the position of the corresponding photoconductor 20 when the position where the document presence detection sensor 39 is turned off reaches the optical axis of the rinse 45. The paper feed solenoid is turned off in synchronization with the turning on of the registration solenoid, and the registration solenoid is turned off in synchronization with the turning off of the paper discharge detection sensor 67.

As a result, the copy processing operation is completed and the standby state is entered. Therefore, by closing the original conveying table 1 and the paper feeding table 3 in the state shown in FIG. 2, the open / close switches 31 and 32 are turned off, and in synchronization with this, the fixing heater 3
3. The fluorescent lamp heater 34 and the cooling fan 30 are turned off.

In the following, the configuration, operation, etc. of each process unit, etc., which constitute this machine having the above-described general operation will be individually described in detail.

[Photoreceptor 20] ... See FIGS. 4 to 7.

The endless belt-shaped photoreceptor 20 has a plurality of rollers located on the inner peripheral side thereof, that is, a driving roller 70 and a cleaning roller.
71 and the transfer roller 72 are supported in a vertically long state of an inverted triangle, and the developing roller 73 and the tension roller 74 are abutted against the outer peripheral surface in a concave shape so that the center portion of the belt is spaced apart. It is becoming narrower.
When the drive motor 75 (see Fig. 6) is turned on, the drive roller
A drive gear 76 engaged with 70 is interlocked with the photosensitive member 20 to rotate the photosensitive member 20 at the same speed as the document conveying roller 37. Drive roller here
70 is made of a material having a large frictional resistance such as a rubber roller or a flocking roller, and is provided downstream of the image forming position of the rinse 45 with respect to the photoconductor 20 but upstream of the developing roller 73. By providing the driving roller 70 at such a position, the photoconductor 20 is given a tension for always providing planarity at the image forming position, and the developing roller 73 side becomes the loose side, so that the developing roller 73 and the photoconductor 20 are provided. The stress in the nip portion between and is relieved, and both followability can be obtained.

The transfer roller 72 is arranged downstream of the developing roller 73 and at a position facing the transfer charger 24. Drive rollers located at almost the same position on these upper and lower collinear lines
70, the developing roller 73 and the transfer roller 72
The device is made thin because it is recessed in a concave shape, a wide developing nip is secured in the developing roller 73, and the intermediate developing roller 73 is bited to minimize the empty space on the inner peripheral side of the photoconductor 20. To be done.

The cleaning roller 71 is disposed at the same height position as the drive roller 70, that is, at a position facing the drive roller 70 and in which the image forming portion of the photoconductor 20 is orthogonal to the image forming optical axis of the rinse 45. There is. The blade 51 faces the cleaning roller 71. The tension roller 74 is arranged so as to be pressed at a position where the photosensitive member 20 is recessed at an intermediate outer peripheral position between the cleaning roller 71 and the transfer roller 72. In this way, the photoconductor 20 is provided in the vertically long state, and is provided in the narrow state in which the central portion is recessed as much as possible.

Here, since the position of the tension roller 74 is downstream of the transfer position and upstream of the charging position and does not affect the latent image and the visible image on the photoconductor 20, an insulator is used even if it is a conductor. May be In order to prevent the surface of the photoconductor 20 from deteriorating, the tension roller 74 is preferably a soft touch roller such as a brush roller or a surface flocking roller, and is driven at a constant speed with the photoconductor 20. As the flocking material, an acrylic polymer-based carbon-arranged organic conductive fiber is preferable.

The transfer roller 72 has a smooth surface and low friction. Therefore, in order to prevent the deviation of the photoconductor 20, deviation prevention guide ridges 77 are formed on both sides of the inner circumference of the photoconductor 20 (see FIG. 4) and are regulated at the end of the transfer roller 72. (See Figure 34). The guide ridges 77 are mainly made of a urethane rubber material, so that the flexibility of the loop of the photoconductor 20 is not hindered, and deterioration to the environment is prevented. The transfer roller 72 is a photoconductor.
In order to prevent the temperature rise in the loop of 20, the porous hollow roller which does not have a problem in the surface property of the photoconductor 20 is suitable.

It should be noted that the inner surface of the image forming position of the photoconductor 20 may be provided with a means such as a tension plate for providing flatness so as to prevent image blurring. However, according to this embodiment, since the span between the drive roller 70 and the cleaning roller 71 is minimized and the image forming position is located on the pulling side of the drive roller 70 according to the above-described configuration, Image blurring can be prevented without providing a tension plate or the like.

By the way, on both sides of the image effective area on the surface of the photoconductor 20 which is looped by the seam, as shown in FIG. 4, a conductive layer 78 formed by black coating is provided. The casing 79 of the photoconductor 20 is provided with a static elimination brush 80 facing the conductive layer 78.
Is provided near the drive roller 70. Static elimination brush
A leaf spring 81 is in contact with 80, and the conductive layer 78 is grounded via the static elimination brush 80 and the leaf spring 81. The detection mark 52 for seam detection is gold and is provided on a part of the conductive layer 78. An opening 82 is formed in the casing 79 at a position on the locus of the detection mark 52 that faces the seam sensor 53.
52 can be detected, and is provided for control so that the seam position is always in the non-image area. Also, on a part of the surface of the photoconductor 20,
A non-charged layer portion 83 for forming a blank portion at the front end of the transfer paper is formed over the entire width at a position corresponding to 3 ± 2.5 mm with respect to the front end of the paper. The non-charged layer portion 83 is formed by painting a black conductive material, and its position is controlled by the detection signal of the seam sensor 53.

Generally, in this type of electrostatic recording device, after the image on the photoconductor 20 is transferred onto the transfer paper and separated from the photoconductor 20, a post-process such as fixing is performed, but a blank portion is formed at the leading end of the transfer paper. ,
It is necessary to prevent a fixing jam caused by the transfer paper being wound around the fixing roller 63. Here, after uniformly charging the surface of the photoconductor 20, an image can be obtained on the transfer paper through the processes of exposure, development, transfer, and fixing. However, the non-charged layer portion 83 of the photoconductor 20 is formed by the charger 21. Even if it receives a similar charge, it will not be charged,
Since an electrostatic latent image is not formed, it is equivalent to the charge erased by the eraser. Therefore, by adjusting the position of the non-charged layer portion 83 and the timing of the front end of the transfer paper, it is possible to form a blank portion at the front end of the transfer paper without using an eraser. Therefore, the device can be made compact. Further, it is easy to provide such a non-charged layer portion 83 in the belt-shaped photoconductor by coating or the like as described above.

The casing 79 that supports and covers the mechanism around the photoconductor 20 as described above rotatably supports each of the rollers 70 to 72 through a slide bearing, and prevents the casing 79 from bending due to the loop configuration of the photoconductor 20. In consideration of a case where contact with the inner surface may occur, a low friction member is provided in an inner surface treatment (low friction treatment) for preventing deterioration of the photoconductor 20 or a key portion in the casing 79.

In the casing 79, the bearings of the transfer roller 72 are fitted to the lower guides (not shown) provided on the body side plates 85 on both sides,
Similarly, the bearing 89 (see FIG. 7) of the cleaning roller 71 is rotatably mounted on the upper guide 88 that engages with the body side plate 85, so that the positioning with respect to the exposure optical system described later is performed.

[Document Feeding and Conveying Means 28] ... See FIGS. 8 and 9.

The document feeding / conveying means 28 is arranged at the uppermost position above the photoconductor 20. First, when the original conveying table 1 whose outer surface also serves as an outer cover is manually pushed, the lock 90 provided inside is released, and when the handle 8 is gripped and lifted, the relay fulcrum 91, the rotation fulcrum 92, and the arm 93. Then, the original transport table 1 is guided to the set open position.

As shown in FIG. 9, the pair of side guides 9 provided on the original conveying table 1 are connected to the rack gears 94 and 95, respectively, and the rack gears 94 and 95 located at the center. With the pinion gear 96 that meshes with 95,
When one side guide 9 is moved, the other side guide 9 is also interlocked and moved in the opposite direction by the same amount.

Inside, conveyance rollers 37, 46 rotatably supported on the main body side plate 85 via bearings are provided at front and rear positions of the contact glass 41. These transport rollers 37,46
Driven rollers 38 and 47 that are driven to rotate are provided on the upper part of the. Document holding plate 40 located on the top of contact glass 41
Is provided so as to be rotatably supported by the bearing of the driven roller 47 and positioned on the contact glass 41 by its own weight. The lower surface of the document holding surface 40 is white and is made of a low friction material.

The outer guide 49 is formed as a guide fin by the rib of the back cover 6 of the main body. Further, an inner guide 48 is provided which has a constant space with respect to the outer guide 49 and guides the document conveyed by the pair of rollers 46 and 47 to the paper discharge side. Further, a document conveyed on the reverse conveyance path 50 by these guides 48, 49 is attached to the document feeding / conveying means 28 side and the paper ejection roller 11 attached to the rear cover 6 side of the main body. It is to be ejected by a plurality of driven rollers 97 pressed against 11.

Since the document transport and discharge path is simplified and shortened as described above, a trouble occurs during the transport of the transfer paper after the registration position when the maximum copy document is copied, and the jam detection works to drive the drive motor 75. Even if the document is stopped, the document is completely ejected, so that maintenance of the document when the transfer paper is jammed becomes unnecessary. Further, if a jam occurs during the feeding of the transfer paper before the registration position, the original is present in the original feeding / conveying means 28 because it is being conveyed. In this case, the inner cover is used. The document discharge table 12 forming the opening is rotated about the hinge 98, and the document pressing plate 40 is also lifted around the axis of the driven roller 47 by holding the handle thereof to open the contact glass 41 or the outer guide 49. It is exposed and the original can be removed. Further, it is possible to clean the contact glass 41.

[Exposure optical system 22] ... See FIGS. 10 to 12.

The exposure optical system 22 is arranged directly above the photoconductor 20 and below the document feeding / conveying means 28. In this exposure optical system 22, each component is laid out within one floor by the optical unit base 100 attached to the main body side plate 85. First, the socket 101 that holds both ends of the fluorescent lamp 43 that illuminates when the document transported by the document transport roller 37 passes over the contact glass 41 having a thickness of 3 mm is positioned on the rising piece of the optical unit base 100. Installed. Since the image density changes depending on the tube wall temperature of the fluorescent lamp 43, it takes a stable time to reach the set light amount. Since this changes depending on the environment and the manual notch operation, in this embodiment, the fluorescent lamp heater 34 is attached to the lower surface of the fluorescent lamp 43.
The fluorescent lamp 43 is installed in synchronization with the start of warming up the main unit.
I try to warm up the tube wall. The fluorescent lamp heater 34 is also supported on the optical unit base 100, and is pressed against the fluorescent lamp 43 side by the spring 102. In consideration of such a tube wall temperature of the fluorescent lamp 43, according to the present embodiment, the unit portion is made into one floor by the optical unit base 100, and cooling due to heat dissipation of the fluorescent lamp 43 is prevented. Also shortens the warm-up time and reduces fluctuations due to the external environment.

The aperture angle of the fluorescent lamp 43 is set in the most efficient range of 60 to 80 ° with respect to the amount of light. A lightweight and low-cost aluminum bright alloy plate is used for the reflecting plate 44 for collecting the reflected light from the document surface, and the side erase shape part 44a for reflecting the light outside the maximum effective width of the photoconductor 20 is also formed. It is integrally bent. By side-erasing the outside of the image area on both sides by the side-erase-shaped portion 44a, the burden of preventing toner scattering near both sides of the cleaning device 26 is reduced.

On the back side of the reflector 44, an opening 44 formed in the reflector 44
The automatic light control sensor 103 is mounted on the optical unit base 100 so as to face b. This automatic light control sensor 103
Detects the amount of light of the fluorescent lamp 43, converts the voltage into a voltage, compares the voltage with a reference voltage specified by a manual notch in advance by the CPU, and outputs a dimming control signal according to the comparison result to the fluorescent lamp ballast. The fluorescent lamp stabilizer converts the dimming control signal into a lighting signal to change the light emission output of the fluorescent lamp 43, and by repeating this, the light quantity of the fluorescent lamp 43 is controlled to be stable at a pre-specified notch. It The emission color of the fluorescent lamp 43 is green,
The peak wavelength is set to 543 nm, which is the most suitable wavelength for the spectral sensitivity of the photoconductor layer of the photoconductor 20.

The document edge detection sensor 42 is the automatic light control sensor 10.
It is stored in the same case as 3.

The optical unit base 100 is provided with brackets 104 for supporting and positioning the contact glass 41 and supporting both sides thereof as a positioning holder for the rinse 45. A leaf spring (not shown) for fixing the rinse 45 is also provided close to the bracket 104. A soft foamed polyurethane 105 for shielding the reflected light is provided around the rinse 45, and it prevents flare light on the side of the exposure slit 106 formed in the optical unit base 100 facing the rinse 45 and at the side of the main body. It is also designed to prevent resonance from.

[Electrification charger 21 and static elimination LED 27] ... Figs. 5 and 1
See Figures 3 through 18.

The charging charger 21 is provided above the photoconductor 20 and upstream of the rinse 45. More specifically, it is located on the lower surface of the optical unit base 100 and is arranged upstream of the exposure slit 106 with respect to the moving direction of the photoconductor 20.
The charging charger 21 includes a casing 110 and a charge wire 111.
And grid 112. The casing 110 uses the cut and bent portion 113 formed in the optical unit base 100 as a guide,
A casing claw 114 facing the cut and bent portion 113 is fitted, and a casing arc portion 115 on the side opposite to the casing claw 114 is fixed to the optical unit base 100. A leaf spring 116 is provided on the optical unit base 100, and the casing 110 is pressed and positioned at a position close to the casing claw 114. Openings 117 are formed in the upper surface of the casing 110 at three locations in the longitudinal direction so that ozone O ₃ due to discharge, which adversely affects the formation of an electrostatic latent image, escapes from the inside of the casing 110 to the outside.

As shown in FIG. 5, the grid 112 for applying a uniform charging potential to the photoconductor 20 applies tension to the bracket 118 engaged with the casing 79 via a spring 119,
The constant gap is always maintained with respect to the photoconductor 20. A varistor 120 is provided on the optical unit base 110 for performing a constant discharge without being affected by discharge unevenness of the charging charger 21, environmental change, power supply change, and the like. Insulation holder 121
It is performed by the leaf spring 122 provided through. This prevents non-uniform charging due to external factors. Further, the ground leaf spring 81 of the static elimination brush 80 is also supported by the optical unit base 100.

The charge elimination LED array 27 is arranged at a position upstream of the charger 21 and removes the residual potential remaining on the surface of the photoconductor 20 after the transfer process. The static elimination LED array 27 is positioned and supported by a holder 123 attached to the optical unit base 100. The static elimination LED array 27 is irradiated with a light intensity of 23 to 46 μW / cm ² in a wider area than the charging width of the charger 21.

[Developing device 23] ... See FIGS. 19 to 23.

After uniform charging, the electrostatic latent image formed on the photoconductor 20 by the exposure optical system 22 is substantially inverted at the position of the drive roller 70,
Development is performed by a developing device 23 provided on a rear cover base 130 inside the rear cover 6 at the innermost position on the downstream side and directly below the operating side. Here, since the developing device 23 contacts the developing roller 73 with the belt-shaped photoconductor 20 in such a manner that the belt-shaped photoconductor 20 is recessed, it is possible to ensure a sufficient developing nip and perform a stable developing operation. You can
In addition, the useless space in the belt is reduced as much as possible, and the developing device 23 can be arranged around the concave portion formed by the developing roller 73, which enables further reduction in thickness and size. Further, by disposing only the developing device 23 on the back side of the photoconductor 20, it is possible to reduce the amount of developer stains and the like on the operation side that involves opening and the like.

The developing device 23 is of a one-component magnetic roll developing system, and the toner cartridge 131 replenishes the consumed toner. The toner cartridge 131 has guide grooves 133 formed on the developing unit side plates 132 on both sides,
The rotation shaft 134 of the toner cartridge 131 is fitted and positioned, and the pins 135 at both ends are fitted and positioned in the positioning groove 136 of the developing unit side plate 132 while rotating the toner cartridge 131.

To replenish the toner from the toner cartridge 131, the current shield is wound, the attached winch 137 is engaged with the shield, and the roller 138 rotatably supported by the toner cartridge 131 is chucked. It is done by rotating with. As a result, the shield is wound around the roller 138 and peeled off, the lower surface of the toner cartridge 131 is fully opened, and the toner inside falls.

The toner that fell is the developing unit side plate 132, casing 1
It is stored in the developing housing consisting of 39 and blade holder 140. Toner scattering, which is a problem during the stack transfer process, is prevented by interposing a soft polyurethane foam 141 between the casing 139, the blade holder 140, and the casing installation portion of the developing unit side plate 132 to seal them.

The toner accumulated in the developing housing is agitated by the agitator 142 rotatably supported by the developing unit side plate 132 via a shield bearing, and blocking due to toner accumulation is prevented. Below the agitator 142, at the lowermost position in the housing, two two-blade rollers 143, 144 rotatably supported by the developing unit side plate 132 via shield bearings are provided at the developing roller 73, similarly to the agitator 142.
And are arranged side by side. Since the bottom portion of the casing 139 is formed in a curved shape along the rotation locus of the two-blade rollers 143, 144, the rotating two-blade rollers 143, 144 should form a narrow portion with the casing 139. Then, the toner dropped on these two-blade rollers 143 and 144 is transferred in the rotation direction. As a result, the toner is transferred from the agitator 142 to the double-blade roller 144 side via the double-blade roller 143, and is smoothly supplied to the developing roller 73 side by the double-blade roller 144.

The developing roller 73 has a built-in magnet for conveying toner. A metal blade plate 145 for frictionally charging the toner is attached to the blade holder 140, and the lower side is attracted to the surface of the developing roller 73 by the magnetic force of the built-in magnet. That is, the blade plate 145 is positioned with respect to the developing roller 73 by the blade holder 140 attached to the developing unit side plate 132. The blade holder 140 also serves as a casing for the agitator 142 as described above, and improves the toner stirring property. Therefore, since the blade plate 145 vibrates due to the magnetic force of the magnets in which the polarities are arranged inside the developing roller 73, a gap is intermittently formed between the developing roller 73 and the developing roller 73. When the toner is conveyed by the magnetic force from this gap, it is triboelectrically charged to the positive polarity, and a substantially uniform toner layer is formed on the surface of the developing roller 73. Here, in the journal portion of the developing roller 73, a soft urethane foam ring 146 for sealing a gap between the developing roller 73 and the developing unit side plate 132 is interposed. Therefore,
Toner scattering and dropping from the gap between the developing roller 73 and the developing unit side plate 132 is also prevented. Further, an under case 147 (which is integrally formed with the casing 139 in this case) is provided to prevent and receive the scattering of the toner falling from the developing roller 73 to the outside of the unit due to resonance or the like due to an external factor. It is provided at the downstream position of the developing roller 73 with the same width as the developing unit side plate 132. Further, in the under case 147, a charge eliminating brush 148 for removing a potential remaining on the surface of the developing roller 73 after development is provided.
It is provided over almost its entire length in contact with the surface. Further, since the upper opening of the under case 147 is provided at a position where the developing roller 73> the photoconductor 20, the falling toner is on the side of the developing roller 73 where the air flow is large (the linear velocity ratio is 4:
It will flow into 1).

The electrode plate 149 provided on the developing unit side plate 132 is grounded via the electrode pin 150 in order to transfer the toner on the surface of the developing roller 73 to the photosensitive member 20 side for development, while the main body developing bias power source supplies this electrode. By applying a voltage to the developing roller 73 via the pin 150, a potential difference is provided. Further, the potential remains on the surface of the photoconductor 20 after exposure at a position corresponding to the background of the paper, but since transfer of toner is prevented by such application control of the developing bias voltage, the background stain after transfer is To be prevented.

By the way, the toner in the unit is consumed by repeating such a developing process, and the consumption state is detected by the toner end sensor 151 provided in the main body. This toner end detection will be described with reference to FIGS. 21 and 22. First, on the shaft of the agitator 142, the gear 1
52 are provided. This gear 152 has a groove and a spring 1 for engaging with the agitator 142 on the inner peripheral portion.
53 is interposed. Further, a disc 154 that engages with the spring 153 and the shaft of the agitator 142 and has a notch 154a is provided. Around the outer periphery of the disk 154, a roller 157 of an actuator 156 biased by a spring 155.
Is rotatably provided. As a result, when toner is present, the agitator 142 causes the gear load 152 to move due to the toner load.
Rotate later. For this reason, the cutout 1 of the disc 154
54a and the groove of gear 152 remain disengaged (Fig. 21 (a))
And the state shown in FIG. 22 (a)), the rollers 157 are driven on both outer circumferences. On the other hand, when the toner runs out, the agitator
Since the load of 142 is lightened, the notch 154a of the disk 154 and the groove of the gear 152 are aligned (states shown in FIGS. 21 (b) and 22 (b)), and the roller 157 is fitted, The actuator 157 turns on the photo interrupter type toner end sensor 151. Then, the toner replenishment display is turned on.

By the way, the driving of the developing device 23, in particular, the rotational driving of the developing roller 73 is directly driven by the driving motor 75. As shown in FIGS.
The gear 161 of the developing roller 73 is substantially directly connected to the drive gear 160 on the shaft via gears 162a and 162b having different diameters. Besides this,
Other members in the developing device 23, that is, the agitators 142 and 2
The single-blade rollers 143, 144 are driven via a gear 163 integral with the gear 161 and having a different diameter, as well as gears 164, 165, 166, 167a, 167b, 152. The gear 165 is provided on the axis of the two-blade roller 144, and the gear 166 is provided on the axis of the two-blade roller 143.
The 152 is provided on the axis of the agitator 142 as described above. On the other hand, the driving member in each process unit other than the developing device 23 is also driven by using the one driving motor 75 as a driving source, but as shown in FIG. It is driven via the relay transmission means 168 by a gear group. As described above, since the driving of the developing roller 73 is substantially directly connected to the drive motor 75 and is performed independently of the other process units, the vibration of the other units is not transmitted to the developing roller 73 ( (Without resonance),
Development defects such as image density pitch unevenness are also prevented.

[Paper Feed Unit of Transfer Paper Feed Conveying Device 29] ... FIGS. 24 to 31
See figure.

The transfer paper feeding / conveying device 29 is provided directly below the photoconductor 20. First, the paper feed table 3 is supported by unit side plates 170 on both sides so as to be rotatable and openable via a support shaft 171. At this time, a sector gear 172 is provided on the support shaft 171, and meshes with an oil damper gear 173 fixedly supported by the unit side plate 170 to form a gear damper configuration. Further, a lock member 174 is provided on the unit side plate 170, and a hook formed on both sides of the paper feed table 3 is projected.
When the 175 is disengaged, it can be locked or unlocked to be opened. That is, when the outer surface of the closed paper feed table 3 is manually pushed, the hook 175
Is disengaged from the lock member 174 to be unlocked, and the paper feed table 3 is linearly and semi-automatically opened by the support shaft 171 being the center of rotation and the engagement of the sector gear 172 and the oil damper gear 173. At this time, the paper feed table 3
The safety switch 32 is pushed by a part of the switch and turned on, and the AND signal with the ON signal of the switch 31 causes a warm-up state. Further, the paper feeding table 3 is positioned in an open state by a part of the paper feeding table 3 abutting on a stopper 176 provided on the main body side.

Here, in the opened paper feed table 3, as in the case of the document transport table 1, a pair of side guides 13 is provided.
The rack gears 177 and 178 and the pinion gear 179 are combined to move in the width direction in an interlocking manner.
Further, the friction pad 16 provided at the center of the innermost portion of the paper feeding table 3 is paired with the calling roller 15 to reliably feed the stacked transfer sheets up to the last one.

The transfer paper is set on the paper feed table 3, and the paper feed solenoid 180 provided on the unit side plate 170 is turned on by the document leading edge detection signal on the paper feed / conveyance side, and the clutch pawl 181.
The claw 181a of the claw 181a separates from the sleeve 182, the claw 181b separates from the convex portion 183, the driving force from the main motor 75 is transmitted to the calling roller 15 via the paper feeding roller 55 and the square belt 184, and the feed clutch It is transmitted to the cam portion 186 of 185 and is driven to rotate. The sector gear 1 in which the pin 187a is joined to the outer periphery of the cam portion 186 by the rotation of the cam portion 186
87 rotates counterclockwise to rotate the pick-up arm 189 clockwise through the pinion gear 188. This pickup arm 189 has a cam shape and is a support 190 for the calling roller 15 (rotatable around the axis of the paper feeding roller 55).
The arm 191 connected to is in pressure contact. Therefore,
When the pickup arm 189 rotates clockwise, the calling roller 15 is displaced downward on the transfer paper. In addition, the shaft of the tip fence 32 is connected to the pickup arm 189 via a pinion gear 192 and a sector gear 193, and the tip fence 35 is also turned forward by the clockwise rotation of the pickup arm 189. The transfer paper can be fed. Further, when the cam portion 186 rotates, the sector gear 187 now rotates in the clockwise direction, the calling roller 15 is displaced upward, and the tip fence 35 is also returned to the raised state. This prevents double feeding.

Here, the functions of the feed clutch 186 and the cam portion 186 are that when the paper feeding solenoid 180 is turned on, the clutch pawl 181b separates from the convex portion 183 and the cam portion 186 moves counterclockwise as shown in FIG. 30 (a). Rotate in the direction. Also, the clutch pawl 181a
Also separates from sleeve 182. When the cam portion 186 is further rotated, the projection 194 is engaged with the clutch pawl 1 as shown in FIG. 30 (b).
Upon hitting 81c, the rotation of the cam portion 186 is stopped. At this point, the sector gear 187 has completed one reciprocating motion, and the calling roller 15 has finished rising. When the sheet feeding solenoid 180 is turned off, the clutch pawl 181b hits the convex portion 183 and the clutch pawl 181a also hooks on the sleeve 182, as shown in FIG. 30 (c).

Next, the separating and feeding operation will be described with reference to FIG. First, the tip fence 35 is tilted forward, and the calling roller 15 contacts the transfer paper 195 on the paper feed table 3. The rotation of the calling roller 15 is transmitted to the transfer paper 195, and the friction pad 1
According to 6, only one sheet is fed from the sheet feeding table 3. The fed transfer paper 195 is continuously conveyed by the paper feed roller 55, and by the rotation of the cam portion 186 of the feed clutch 186, the calling roller 15 is separated from the transfer paper, and the tip fence 35 is also raised, and the next transfer is performed. The feeding of the paper 195 is prevented. Then, the sheet feeding solenoid 180 is turned off in a state of having a certain slack by the detection of the registration sensor 62, and stands by for synchronizing with the visible image on the photoconductor 20.

Further, when not in use, the paper feed table 3 is manually lifted as it is and rotated in the closing direction,
The hook 175 engages with the lock member 174 and is locked in the closed state.

[Near the transfer charger 24] ... See FIGS. 32 to 34.

The transfer charger 24 is located at a position directly below the photoconductor 20.
It is located opposite to 72. A registration roller 60 is supported on the main body side plate 85 via a bearing 200 at a position upstream of the transfer charger 24. A transfer casing 201 is provided which is fitted and supported by the milling portion of the bearing 200 and is rotatable by its outer diameter. A driven roller 61, which is rotated by being pressed against the registration roller 60, is provided in the opening of the transfer casing 201 via a bearing 202 and a bracket 203, and serves as a lower guide for transfer sheet transfer. The transfer sheet 195 conveyed by the pair of the registration roller 60 and the driven roller 61 is a transfer casing 2 provided with a mylar 204 serving as an entrance guide in close proximity to the photoconductor 20.
Guided by 01. The mylar 204 has a convex central portion in the width direction so that the transfer paper surface uniformly follows so that the front end of the transfer paper is synchronized with the visible image on the photoconductor 20. Further, the transfer casing 201 is provided with an end block 206 at a position of 10 ± 0.2 mm just below the center of the transfer roller 72 for holding both ends of a charge wire 205 for discharging a polarity opposite to that of the toner in a stretched state. As a result, the transfer paper 195 faces the visible image and is electrostatically adsorbed and conveyed, whereby the toner image on the photoconductor 20 is transferred to the transfer paper 195 side.

Here, in the transfer casing 201, the transfer charger 2
At the opening as 4, a nylon wire 207 is stretched in such a manner that it spreads in the paper transport direction in order to prevent the transfer paper from getting inside.

Further, it is necessary to separate the transfer paper 195 from the photoconductor 20 after the transfer. In this respect, although generally separated by a separation charger or the like, in this embodiment, the transfer roller is
They are separated by the curvature of 72, and do not require a dedicated peeling means separately. A guide fin 208 for guiding the transfer paper 195 separated from the photoconductor 20 after the transfer to the fixing nip portion of the fixing device 25 is attached using a part of the transfer casing 201 similarly to the nylon wire 207. .

[Fixing device 25] ... See FIGS. 35 to 37.

The fixing device 25 uses a roller pair of a fixing roller 63 and a pressure roller 64 to heat and fix the unfixed toner on the transfer paper 195 that enters from the transfer unit side. It is located in the front position. First, the fixing roller 63 has a gear 210 on its axis which is driven to rotate by a drive motor 75, and is supported by the unit side plate 170 via a slide bearing 211. The pressure roller 64 side is vertically slidably supported on the unit side plate 170 via a slide bearing 212, and is pressed against the fixing roller 63 by a pressure lever 214 engaged with a spring 213. Is urged to do so. Transfer paper 195 is such a roller 6
When passing through 3,64 pairs, it is fixed by receiving a constant temperature (180 to 185 ℃) and a constant pressure (18 to 21 kg).

Here, as the fixing roller 63, a thin-walled Al tube roller integrally molded with a high thermal conductivity having a Teflon coating is used, and the fixing heater 33 is built in on the shaft center. Both ends of this fixing heater 33 have bracket terminals 215.
Is energized while being supported by. At this time, in order to improve the thermal efficiency, black coating or the like may be applied to the inner wall surface of the fixing roller 63.

By the way, a thermistor 220 for controlling the temperature of the fixing heater 33 by contacting a part of the upper peripheral portion of the fixing roller 63 is provided. A thermostat 221 for preventing the temperature of the fixing heater 33 from excessively rising due to some accident or the like is also provided in contact with the upper peripheral portion of the fixing roller 63. More specifically, the thermistor 220 and the thermostat 221 are attached and supported at positions separated from each other in the width direction via a heat shield plate 222. The heat shield plate 222 is located near the outer circumference of the fixing roller 63 and reflects the radiant heat from the fixing roller 63. Further, a heat insulating cover 224 is provided to face the heat shield plate 222 via a space 223. That is, the fixing roller 63
The surrounding area has a two-layer heat insulating structure including a heat shield plate 222 and a space 223. The outer surface side of the heat insulating cover 224 is flocked.

By the way, the heat insulating cover 224 is provided with a cut-and-bent portion having a plurality of slits (vent holes) 225 located almost directly above the fixing roll 63, and two cooling fans 30 are attached and held therein. There is. That is, the cut and bent portion forms a ventilation hole and also serves as a cooling fan bracket. Also, as the mounting positions of the two cooling fans 30,
When viewed in the axial direction of the fixing roller 63, the fixing roller 63 is positioned between the copy minimum size end and the copy maximum size end. Further, above the first duct 2 that shields the heat insulating cover 224 over almost the entire area including the cooling fan 30.
26 are provided. This first duct 226 and heat insulation cover 2
Insulation material such as foamed polyurethane is used for the contact area with 24
7 are intervening. This prevents thermal deformation. In particular, in this embodiment, the contact surface, that is, the outer surface of the heat insulating cover 224 is flocked so that the heat insulating effect is high.

Further, a pair of left and right second ducts 228 and 229 are provided above the duct 226 so as to communicate with the exhaust port side of the cooling fan 30 and guide the exhaust flow to the side surface of the main body. A filter 230 is provided near the exhaust outlets of these second ducts 228 and 229.
Is provided.

A third duct 231 for upward exhaust is provided at the upper center of the first duct 226 and the second ducts 228, 229.
Ribs 23 formed on the back surface of the front cover 2 forming the outer cover
A duct is formed by fitting with 2 (see Fig. 13).

According to the heat insulating / cooling structure around the fixing roller 63 of this embodiment, the radiant heat of the fixing roller 63 is kept in the first air layer by the heat shield plate 222, and the heat of the space 223 forming the second air layer is covered by the heat insulating cover. Absorbed by 224. Moreover, at this time, the heat shield plate 222 has a duct shape, and the air whose temperature has risen due to the suction of the cooling fan 30 is supplied to the first, second and third ducts 226, 228, 229, 2
Since it is exhausted to the outside of the machine by 31, it is possible to prevent the temperature rise of each part located on the surface of the photoconductor 20. Furthermore, ozone generated from the transfer portion can be sucked and exhausted by the cooling fan 30 and the first and second ducts 226, 228, 229, and the deterioration of the photosensitive layer on the surface of the photoconductor 20 due to ozone and temperature rise can be prevented. obtain.

A plurality of peeling claws 65 for peeling the transfer paper 195 after fixing from the fixing roller 63 and guiding it to the paper discharge roller 66 side are rotatably provided, and are biased to the fixing roller 63 side by a spring 240. . The paper discharge roller 66 is disposed near the pressure roller 64 and is supported by a guide plate 241 which also serves as an exterior cover. Further, a paper discharge sensor 67 is also provided in the vicinity of the paper discharge roller 66 by using the guide plate 241, and is provided for detecting the transfer paper transport time from the registration position so as to take charge of the jam detection in this span. Has been done.

By the way, when the transfer paper 195 is stopped due to some accident at the fixing nip portion between the fixing roller 63 and the pressure roller 64, it meshes with the gear 243 provided on the shaft of the pressure roller 64. The knob 245 having the rotating gear 244 may be manually rotated.

Further, for the processing when the transfer paper 195 is stopped at the position in front of the fixing nip portion, first, the pressure spring 246 engaged with the unit side plate 170 and the pressure lever 214 for the pressure roller 64 are relayed. A mating bracket 247 is provided. This bracket 247 has a lock lever 249 fitted to a positioning pin 248 provided by caulking on the side plate 85 of the main body.
Are connected by pins 250. A handle 251 is fixed to the center of the front side of the bracket 247. Therefore, when the handle 251 is gripped and the bracket 247 is pulled to the front side, the lock lever 249 rotates counterclockwise to disengage from the positioning pin 248, and the lock is released. When this lock is released, the unit of the transfer paper feeding / conveying unit and the fixing unit supported by the unit side plate 252 is moved to the front side via the guide 253 provided on the main body side plate 85 and guiding the movement of the pin 250. To slide. At this time, the lever 254 having one end connected to the pin 250 and the holding lever 256 having the lever 254 slidably held in the longitudinal direction thereof and having the other end connected to the main body side plate 85 via the pin 255 are also integrated. However, since the pin 255 is guided by the guide hole 257 of the body side plate 85, the state shown by the alternate long and short dash line in FIG. 37 is obtained. Also, when moving the unit side plate 252 to the front side,
The support member 259 provided on the main body base 258 also moves to the front side. A pin is provided between the support member 259 and the unit side plate 252.
A rotation lever 261 is interposed by 260 so that the unit including the unit side plate 252 can be rotated downward about the pin 260 in the front pulled-out state. Therefore, by rotating the unit near the sheet feeding section downward as shown by the chain double-dashed line in FIG. 37, the surface of the reverse conveyance path 59 is largely exposed,
The transfer paper 195 can be removed. In this open state, the unit is held by the levers 254 and 256 extending to the state shown by the chain double-dashed line.

Further, since it is supported by the guide 253 even when it is worn after being released for such jam clearance, it is guided in the closing direction as it is, and the lock lever 249 is engaged with the positioning pin 248 by the action of the pressure spring 213. Locked again. At this time, the transfer charger 24 is
The leaf spring 262 (shown in FIG. 5) provided on the casing 79 for 20 is pressed and positioned.

[Kneading device 26] ... See FIGS. 38 and 39.

The cleaning device 26 is for cleaning and removing the toner remaining on the photoconductor 20 by the blade 51 after the transfer process, and is arranged on the upper front side of the photoconductor 20. Here, the blade 51 is supported by the bracket 270, and by pressing the bracket 270 by the spring 271 provided in the casing 79, the blade 5
1 The tip is in pressure contact with the photoconductor 20 on the cleaning roller 71. The bracket 270 is attached to the casing 79 with a locking pin 2
It is rotatably provided via 72, and positions the tip of the blade 51. Further, since the toner is scraped off from the casing opening at the blade portion 51 and falls, a mylar 273 is provided at the lower end position of the opening as a guide member for preventing the toner from falling outside the casing 79. Further, the casing 79 is also provided with a spring 275 for applying a tension by pressing the bearing 274 of the tension roller 74.

[Electrical equipment parts and its rotating configuration] ... See Fig. 40.

First, the AC line for the AC power supply 300 has an interlock switch 301, a noise filter 302, and a main switch 30.
3, the triac 304, the thermostat 221, the fixing heater 33, the drive motor 75, and the two cooling fans 30 are connected. A power pack 307 for the transfer charger 24 is connected to the DC line of the DC power source 306 connected to the AC line via the power transformer 305. In addition, the DC22V line is connected to the total counter 309, the paper feed solenoid 180, and the registration solenoid 310 via the relay board 308.
Is output to. The relay board 308 is a main PC board 311.
Fluorescent lamp 4 connected to the above 22V line after receiving the output from
3 and output control of the fluorescent lamp stabilizer 312, the power pack 313, the static elimination LED array 27, and the fluorescent lamp heater 34. Power pack
313 supplies power to the charging charger 21 via the varistor 120. Relay board for DC5V line
The paper feed unit sensor 36, the paper discharge sensor 67, and the thermistor 220 are connected via 308. Further, similarly to the 22V line, output control for the automatic light control sensor 103, the collected toner sensor 314, the joint sensor 53, the pulse generator 315, and the toner end sensor 151 is performed from the main PC board 311.

As described above, the present invention uniformly charges the surface of the endless belt-shaped photoconductor by the charging means, and then exposes the original fed and conveyed by the original feeding and conveying means by the exposure optical system. An electrostatic latent image is formed on the photoconductor by the reflected light, the electrostatic latent image is visualized by the developing means, and the visualized image is formed on the transfer paper fed and conveyed by the transfer paper feeding and conveying means. In an electrostatic recording apparatus in which an image transferred by a transfer unit and transferred to a transfer paper is fixed by a fixing unit, and the surface of the photosensitive member after the transfer is cleaned by a cleaning unit, the endless belt-shaped photosensitive member is used. The body is vertically long and is supported by a plurality of rollers in a state where the distance between the photoconductors is narrowed in the central portion, and the static electricity is provided above the photoconductor by the charging means, the document feeding and conveying means, and the exposure optical system. Electric submarine Image forming means is provided, cleaning means and cooling means are provided on one side surface of the photoconductor, developing means is provided on the other side surface of the photoconductor, and transfer means is provided under the photoconductor. Since the fixing unit and the transfer sheet feeding and feeding unit are provided, the endless belt-shaped photoconductor is vertically long and supported by a plurality of rollers in a state where the photoconductors are narrowed in the central portion. Since the space volume inside the photoconductor is small and the space for disposing the photoconductor is small, the selected process units are arranged on the upper part, both side surfaces and the lower part of the photoconductor, respectively. Therefore, the apparatus main body becomes thin, a space-saving design is possible, a waste space is eliminated, and a layout that does not lengthen the paper transport path and a layout that can improve operability, jam handling performance, and the like are possible. Further, the electrostatic latent image forming means, the cleaning means, the cooling means, the transfer means, the fixing means, and the transfer paper feeding conveyance are performed with the upper side and one side surface and the lower side of the vertically long photosensitive member as the operating side. Means and the developing means on the side surface on the back side as viewed from the operating side of the photoconductor, the paper processing at the time of maintenance and the attaching / detaching work of the unit can be facilitated. By arranging it on the back side of the photoconductor as viewed from the operation side, there is an effect that there is little stain by the developer.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a schematic side view of the whole, FIG. 2 is an external perspective view when not in use, FIG. 3 is an external perspective view in a usable state, and FIG. FIG. 5 is an external perspective view of the body, FIG. 5 is a schematic side view mainly showing the photoconductor, FIG. 6 is a front view mainly showing the photoconductor with a part cut away, and FIG. 8 and 9 are schematic side views of the document feeding / conveying device, FIG. 9 is a plan view of the document conveying table portion, FIG. 10 is a schematic side view of the exposure optical system, and FIG. 11 is its schematic plan view. FIG. 12 is a schematic front view showing a part of it by cutting away, FIG. 13 is a schematic side view of the vicinity of the charging / discharging section, FIG. 14 is a schematic plan view of a part thereof, and FIG. 15 is a front view of a part thereof. , First
Figure 16 is a schematic plan view near the charger, Figure 17 is an exploded perspective view near the charger, and Figure 18 is its front view.
FIG. 19 is a schematic side view showing the vicinity of the developing device, FIG. 20 is a front view of the developing device with a part cut away, FIG. 21 is a side view showing the toner end detection operation, FIG. 22 is its perspective view, FIG. 23 is a side view of the drive transmission system for the developing device, FIG. 24 is a schematic side view of the transfer paper feeding section shown in a partially cutaway view, FIG. 25 is a plan view of the feeding table vicinity, and FIG. FIG. 27 is a front view of the vicinity of the paper feed section with a part cut away, FIG. 27 is a front view thereof, FIG. 28 is a perspective view, FIG. 29 is a perspective view of a part thereof, and FIG. 30 shows a paper feed control operation. Side view, Fig. 31 is a side view showing the paper feeding operation.
Figure 32 is a plan view near the transfer section, Figure 33 is its side view, and Figure 34
The figure shows a front view with a part cut away, FIG. 35 shows a front view showing the vicinity of the fixing part with a part cut away, FIG. 36 shows its side view with a part cut away, and FIG. 37 shows the opening operation at the time of jamming. Side view,
FIG. 38 is a side view of the cleaning device shown with a part cut away,
FIG. 39 is a front view thereof, and FIG. 40 is a block diagram showing an electric component and a circuit configuration thereof. 20 ... photoreceptor, 21 ... charging means, 22 ... exposure optical system, 23
...... Developing means, 24 ...... Transfer means, 25 ...... Fixing means, 26 ...
… Cleaning means 28 …… Original paper feeding / conveying device 29 ……
Transfer paper feeding / conveying device, 30 ... Cooling means, 70-74 ... Rollers,

Claims (2)

(57) [Scope of utility model registration request] 1. An endless belt-shaped photoconductor surface is uniformly charged by a charging means, and then a document fed and conveyed by a document feeding and conveying means is exposed by an exposure optical system and the reflected light causes the photoconductor to be exposed. An electrostatic latent image is formed on the electrostatic latent image, the electrostatic latent image is visualized by the developing means, and the visualized image is transferred by the transfer means onto the transfer paper fed and conveyed by the transfer paper feeding and conveying means. In an electrostatic recording device in which an image transferred onto a transfer paper is fixed by a fixing unit and the surface of the photosensitive member after the transfer is cleaned by a cleaning unit, the endless belt-shaped photosensitive member is vertically moved. An electrostatic latent image forming means, which is vertically long and is supported by a plurality of rollers in a state where the distance between the photoconductors is narrowed in the central portion, is provided above the photoconductors by a charging means, a document feeding and conveying means, and an exposure optical system. Arranged A cleaning unit and a cooling unit are provided on one side surface of the photoconductor, a developing unit is provided on the other side surface of the photoconductor, and a transfer unit, a fixing unit, and a transfer paper feed unit are provided under the photoconductor. An electrostatic recording device, characterized in that it is provided with a conveying means. 2. An electrostatic latent image forming means, a cleaning means, a cooling means, a transfer means, a fixing means, and a transfer paper feeding / conveying means with an upper side, one side surface and a lower side of a vertically long photosensitive member as an operating side. 2. The electrostatic recording apparatus according to claim 1, wherein the developing means and the developing means are disposed on the side surface on the back side when viewed from the operating side of the photoconductor.