JPH0844276A - Image forming device - Google Patents

Abstract

PURPOSE:To efficiently perform the cooling by providing the parting plate between a processing unit part and a thermal fixing unit, and forming the exhausting path passing from a cooling air inlet to a sucking fun along the plate. CONSTITUTION:The the exhausting path severally passing to the sucking fun is comprised of the path passing through the air opening from the rib of the guide member 42, the path passing through photoreceptor 11 from the ozone blower fan 46 and the path passing through the air opening of the paper transporting rib 124. The fixing unit and the tank 57 are efficiently cooled by the air passing through these paths. Then, the thermal transmission from the fixing unit to the process unit is prevented, as the fixing unit and the process unit part are separated by the cover of the fixing unit and the image forming unit case 60, and the adverse effects to the process unit by the thermal fixing unit becoming to the high temp. is eliminated, by the action of the ventilation flow. Moreover, the space is provided between the image forming unit case 60 and the fixing unit, consequently the cooling is efficiently performed by the air made to flow through the space.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine, a facsimile and a printer.
And other image forming apparatuses. In the above image forming apparatus, a well-known electronic device is used.
Bearing the toner image after completing the transfer operation in the photographic process
The transfer paper that has reached the temperature is heated and fixed by a heat fixing device.
It is known to do so. Heat fixing device is a toner image
Is to be melted by heating, and does not itself become extremely hot.
It The high temperature can adversely affect the surrounding equipment
There is a nature. Especially, place a waste toner tank near the heat fixing device.
In the type of image forming apparatus to be installed, the waste toner inside the tank
However, there is an inconvenience that it is heated and melted and fixed. [0003] In view of the above points, the present invention is a heating constant at high temperature.
The process unit is not adversely affected by
An image forming apparatus is provided. In order to achieve the above object, an image according to the present invention
The forming device is equipped with a heat exhaust fan and an image forming unit inside the device body.
And a heat fixing device, and
In addition, the main body is equipped with a cooling air inlet,
Place a partition plate between the knit and the heat fixing device
Between partition boards adjacent to this, and with the process unit
Between the partition plates adjacent to this, the cooling air introduction port
Form an exhaust flow path leading to the above exhaust heat fan
Is composed of. One of the cooling air inlets is a process
On the piece located in the lower area between the unit and the heat fuser
Any holes provided are preferred. The present invention will be described below based on examples. FIG. 1 shows a laser printer which is an example of an image forming apparatus.
It shows the appearance of the linter. This laser printer is
Not shown based on instructions from the host computer
For printing characters on transfer materials such as paper and envelopes
Is. This laser printer is roughly divided into
It is divided into a printer upper unit 1 and a printer lower unit 2.
The paper feed tray 3 is detachably attached to the lower unit 2.
In addition, a paper discharge switching knob 4 is provided. Upper uni
Operation panel 5 and font cartridge insertion port
6, emulation card insertion slot 7 is provided
It Further, the cover 8 which is one of the constituent elements of the upper unit 1
The upper surface of the above constitutes an upper paper discharge tray 9. The transfer material to be printed is placed on the paper feed tray 3.
It is loaded and held on. In the example, the so-called legal rhinoceros
From large size paper such as paper to small size paper such as envelopes
It is possible to print across different types of transfer materials, but this way
When applying a transfer material of different size,
Move the guide plate 254 as shown by arrow K to move each size paper.
To guide. Both guide plates 254 and 254 are under the tray
Linked and move one in either direction K
Then, the other automatically moves to the other in the K direction.
It has become. The operation panel 5 is a transfer material size and other types.
There are switches etc. for setting various printing conditions
I have. The font cartridge slot 6 is a font cart
Ridge, that is, R in which several types of font information are stored
Insert the OM cartridge and use the character
The font information is sent to the trawler. Emulation
The card insertion slot 7 is for a host computer (not shown).
Depending on the type, the host computer and the laser
Emulation card (R
OM card) to connect with the character controller
It is for the first time. The paper output switching knob 4 is a laser printer.
The transfer material that has completed the printing work inside is discharged to the upper discharge tray 9.
Or outside the laser printer as indicated by arrow A
It is to switch whether to discharge to the left. The printer upper unit 1 and the printer lower unit
Toe 2 is hinged on the back side of the figure, and in front
Side to side fixedly held by a lock mechanism to be described later
I have. Lock lever knob protruding from the front of the cover 8
If you push up 10 to release the lock mechanism,
As shown, the printer upper unit 1 is replaced by the printer lower unit
It can be rotated and lifted from 2. Like this
.The lower units 1 and 2 have a structure in which they can be separated
To facilitate maintenance work or
This is because it is easy to replace the body, the developer, and the like. FIG. 3 shows a printer upper unit 1 and a printer lower unit.
Of the laser printer in which the unit 2 and the unit 2 are connected to each other.
It is a sectional side view. Laser printer
The outline of the action of will be described. The printer lower unit 2 is arranged substantially in the center.
The drum-shaped photosensitive member 11 is driven and rotated in the clockwise direction,
First, the charging action of the charger 12 is applied. Electrification
The charge wire 13 of the charger 12 is shown in FIG.
As shown, it is stretched in parallel with the photoconductor 11,
The surface of the photoconductor 11 due to the discharge from the charge wire 13.
Are uniformly charged in the axial direction. The photosensitive member 11 thus charged is then fed to a laser.
The exposure device 14 receives an image exposure action. Laser dew
The optical device 14 is connected to the scanner motor 15 as shown in FIG.
Therefore, the polygon mirror 16 that can be rotated in the clockwise direction
And the laser diode (LD) unit 17 and the first series
The cylindrical lens 18, the first mirror 19, and the sphere
Having a rectal lens 20 and a second mirror 21
I have. The LD unit 17 includes a laser diode.
(LD) is built in.
A laser beam for writing an image signal is emitted based on the signal.
This laser beam is emitted from the first cylindrical
Spherical Ren through the lens 18 and the first mirror 19
Enter 20s. The laser beam is a spherical lens 20.
It is narrowed down by and is refracted upward by about 5 °.
The light enters the one surface of the mirror 16 and is reflected by the mirror surface. Po
The incident light on the Rygon mirror 16 is a spherical lens 20.
Since it is refracted upward by
Passes above the light. The reflected laser beam is
The second cylindrical lens 22 is reflected by the second mirror 21.
Is guided to the photoconductor 11 through the
Be done. At this time, the laser is rotated according to the rotation of the polygon mirror 16.
The beam will move on the second mirror 21 and thus on the photoconductor 11.
Scanning is performed as indicated by mark B (main scanning). This main scan makes you feel
A dot line formed by the laser beam is formed on the optical body.
It This optical scanning is repeated for each surface of the polygon mirror 16.
At the same time, the photoconductor 11 is returned in a direction orthogonal to the main scanning direction.
Rotation in the (sub-scanning direction), and as a result, the surface of the photoconductor 11
An electrostatic latent image corresponding to the image signal is formed. This embodiment
Then, the dot density of this electrostatic latent image is 300 dots / inch
The main scanning and the sub scanning are performed so that like this
If you print based on a high density dot image,
A clear print image equivalent to that of the loose type impact method
Obtainable. In addition, in this embodiment, the polygon mirror
Scanning on the second mirror 21 by bending each surface of 16
The image plane is made flat. Therefore, conventional Polygo
Was disposed between the first mirror 16 and the second mirror 21.
The so-called f-θ lens is unnecessary. This allows
The shape of the entire optical device 14 can be significantly reduced.
became. The LD in the LD unit 17 is the above image signal.
Separate from the writing laser beam, once for each scan
The laser beam for period detection is detected. This beam is Polygo
After being reflected by the third mirror 16, the third mirror 23 and the third mirror
It enters the optical fiber 25 through the lens 24. light
The fiber 25 is a main fiber that controls the entire operation of the printer.
This optical fiber is connected to a controller (described later).
Synchronous detection sent to the main controller via IVA 25
A laser beam for writing the above image signal is generated by an intellectual laser beam.
Control the timing of light emission of the laser. In FIG. 3, the laser exposure device 14
The electrostatic latent image formed on the photoconductor 11 by
According to the rotation, it is carried to the developing roller 26. Book
In the embodiment, the so-called contact developing method is adopted,
The image roller 26 counterclockwise while lightly contacting the photoconductor 11.
It is driven and rotated in the direction. Further, the developing roller 26 has
It is arranged at the bottom of the link 28 and rotates counterclockwise.
Stored in developing tank 28 by toner supply roller 27
The non-magnetic toner 29 is supplied. Therefore, the present
The electrostatic charge on the photoconductor 11 carried to the image roller 26
The latent image is formed by the toner carried by the developing roller 26.
And developed into a visible image. Photoconductor 11 and developing roller
In the contact developing method in which the
Using a one-component developer consisting of toner and magnetic toner
Since it is not necessary, the toner structure is simple. In addition,
Since the rear is not used, the conventional so-called two-component developer is used.
The carrier exchange in the case of being present can be omitted. Furthermore, non-
The magnetic toner makes it easy to perform the fixing work described below.
And make the fixing device compact and simple.
You can If non-magnetic toner is used, it can be obtained by development.
The contour of the toner image can be clearly displayed, and the magnetic toner
Image quality is higher than that of a one-component developer using
It This toner image is then transferred to the transfer charger 30.
Is transferred to the transfer position, which is the position opposite to. 64 is
The toner layer thickness control blade 65 is a toner cartridge
It While the above process is being executed, paper feeding
Transfer material stacked on the tray 3, for example, sheet-shaped transfer
One of the top 31 sheets of paper 31 is driven and rotated in the clockwise direction.
Feed roller 32 and a friction pad
Upper and lower transport rollers separated from other paper by the cord 33
It is sent to the nip part of 34, 35, and further, those transfer rollers
Is conveyed to the transfer position of the photoconductor 11. The transfer paper conveyed in this way is placed at the transfer position.
And is overlaid with the toner image on the photoconductor 11, and
It receives a discharge action by the transfer charger 30. This discharge
The toner image on the photoconductor 11 is transferred onto the transfer paper by
It After the transfer work is completed,
The light from the static elimination lamp 54 composed of the arranged LEDs is
The photoconductor 11 is irradiated with light through the transfer paper and overlaps with the transfer paper.
In a standing state, passing the light irradiation position by the static elimination lamp 54
The surface potential of the photoconductor is removed. When the photoconductor potential is weakened,
The electrostatic attraction weakens, and the transfer paper is
Securely separated from each other, and the paper transport reel formed on the lower frame 78 is
The heating roller 36 and the pressure roller 37 are passed through the valve 124.
It is sent to the provided heat fixing device. Transfer paper and transfer on it
The formed toner image is not heated by the heating roller 36.
Pressure is applied from above and below by both rollers 36 and 37,
As a result, the toner image is fused and fixed on the transfer paper. Heating
In order to heat the roller 36, heat is applied inside the heating roller 36.
Is provided. The transfer paper that has undergone the fixing operation is separated by the peeling claw 39.
Is peeled from the heating roller 36 and sent to the paper discharge roller 40.
To be A paper discharge switching claw 41 is provided at the downstream position of the paper discharge roller 40.
The switching claw 41 is provided with
By turning the paper switching knob 4, the solid line position and the broken line in FIG.
Switch with position. When the switching claw 41 is in the solid line position, the paper is ejected.
The transfer paper output from the roller 40 is discharged to the paper discharge guide member 42 and the paper discharge guide member 42.
It passes through the transport path formed by the paper guide plates 43 and 44.
And discharge to the upper discharge tray 9 by the upper discharge roller 45
To be done. On the other hand, when the switching claw 41 is at the position of the broken line,
The transfer paper from the roller 40 is printed linearly as indicated by arrow A.
Is discharged to the outside. Which mode the transfer paper is ejected from
It is determined by the operation of the switching knob 4 by the controller. General
Then, print on the plain paper transfer paper, which is weak, in page order,
If you want to stack them in page order, upper output tray
Discharge to 9. On the other hand, envelopes and other robust transfer
When printing on material, it is ejected linearly. After the transfer is completed, it contributes to the transfer on the photoconductor 11.
Unused toner remains. This residual toner is
The charge is removed together with the photoconductor 11 by the pump 54.
Scraped from the photoconductor 11 by the blade 55
It The toner scraped off is collected by the toner collecting roller 56.
Therefore, it is sent to the toner recovery tank 57, and hesitates there.
Be done. The feeling of being cleaned by the cleaning blade 55
The optical body 11 is again subjected to the charging action by the charging charger 12.
To be done. The fixing roller 36 of the embodiment has a conductive surface.
It has sex. By doing this, the transfer paper
The electric charge is removed via the fixing roller. Conventionally, transfer paper
Transfer paper that is discharged to the outside to improve stackability
Was discharged with a dedicated static elimination brush before it was discharged.
However, in this embodiment, the static elimination brush is unnecessary. In addition,
To give conductivity to the roller, for example, Teflon
You can use a method of mixing carbon
It Since carbon has a relatively high hardness, this method
If so, the durability of the roller can be improved. The outline of the laser printer according to the embodiment has been described above.
Explained the action of. Details about each part are explained below.
To do. [0025] Process unit section In this embodiment, the photoconductor 11 and the charging member in FIG.
4 and the toner recovery tank 57 of FIG.
As shown in (a), one unit (photoconductor unit 5
8). Also, the developing roller 26 and the toner
-The supply roller 27 and the developing tank 28 are also shown in FIG.
As shown in (b), one unit (developing unit 5
9). These photoconductor units 58
The developing unit 59 is attached to the image forming unit case 60.
Each is detachably supported. The photoconductor unit 58 has a box-shaped case 61.
And the support shaft 62 of the photoconductor 11 is attached to the case 61.
Is rotatably and detachably supported. This case
61 is a laser beam from the laser optical device 14 (FIG. 3).
A hole 63 through which the light enters is formed. Also mentioned above
The toner recovery tank 57 (FIG. 3) is provided by the case 61.
It is separated from the heat fixing device. Furthermore, the case 61 causes the belt to
Casing of electric charger 12 (charge wire 13
The surrounding wall) is configured. Cleaning blade 55
And the toner collecting roller 56 are supported by the case 61, respectively.
Have been. Install the photoconductor 11 in the case 61, and
The reason why the storage tank 57 is detachable is as follows.
It That is, generally, the toner recovery tank 57 is the waste toner.
Replace it with a new one when it becomes full. This place
In this case, the photoconductor 11 and the toner recovery tank 57 are integrated.
When the toner recovery tank is replaced, the photoconductor is also replaced.
Will be. However, recent photoreceptors are made of materials and manufacturing methods.
As a result, the service life is significantly extended. Therefore,
If you try to use the photoconductor until the end of its life, it will be very large.
A large capacity toner recovery tank is required,
It becomes a big one. To avoid this,
The toner recovery tank so that it can be replaced.
It is designed to reduce the size of the linter and effectively use the photoconductor.
It The developing unit 59 has a case 66.
The case 66 prevents the developing tank 28 (FIG. 3) from
The developing roller 26 and the toner supply low
The case 27 is rotatably supported by the case 66.
It The toner cartridge 65 can be attached to and detached from the case 66.
It is attached to. The toner remaining in the developing tank 28 is low.
When it disappears, the cartridge 6 that was installed until then
5 in the developing tank 28 by replacing with a new cartridge
Toner is replenished. The image forming unit case 60 is a printer lower unit.
It is arranged in the hood 2. Therefore, the photoconductor unit 58 and
The developing unit 59 and the developing unit 59 are also arranged in the printer lower unit 2.
Will be. As shown in Figure 2, the printer upper unit 1
When lifted, the photoconductor unit 58 and the developing unit 59
The upper parts of both units are exposed. The image forming unit case 60 can be seen from FIG.
Is formed in the shape of a box with an upper opening, and the front and rear walls
The support shaft 62 of the photoconductor 11 is supported by 60a and 60b.
Groove-shaped supporting portions 67, 67 for forming are formed. support
Photoconductor unit 58, one of which is supported by the portion 67
Is pressed by the stop pawl 69 on the other hand
It The developing unit 59 is also stored in the image forming unit case 60.
In this state, it is pressed by the stop claw 70.
These stop claws 69 and 70 are made of a flexible material.
Cage, each unit 58, 59 image forming unit case 60
When you put it inside, it spreads outwards and does not disturb the insertion.
I'm supposed to be. The photoconductor unit 58 is used as an image forming unit case.
When mounted on 60, a part of the lower side of the photoconductor 11 is the case 6
0 into the opening 71 formed in the bottom wall and then attached to the spindle.
The attached gear 72 plunges into the small opening 73. Looking at the developing unit 59 from the direction of arrow VII
7 and the shaft end of the developing roller 26.
A gear 74 is attached to the. Developing unit 59
When mounted on the imaging unit case 60, this gear 74
The recess 7 in the rear wall 60b of the image forming unit case in FIG.
5 protrudes outward. The left side wall portion 60 of the image forming unit case 60
A pair of pivot pins 76 and 77 are projected on the d.
These pivot pins are attached to the frame 78 (Fig.
1 and FIG. 3) supporting grooves provided on each side plate 78a, 78b
It is fitted to 79, 79. Therefore, as shown by arrow E in FIG.
The image forming unit case 60 is attached to the photosensitive unit 58 and the developing unit.
Centering around the pivot pins 76 and 77 with the unit 59 accommodated
It can be rotated and lifted. In this case, the figure
As shown in FIG. 3, the lower part of the case 60 is the transfer paper transport path.
Therefore, if you lift the case 60 as described above,
The paper transport path is exposed to the outside, and
The copy paper (so-called jam paper) can be easily removed
It If necessary, the entire image forming unit case 60 can be printed.
It can also be removed from the lower unit 2. In FIG. 4, the image forming unit case 60 is shown.
A pair of support pins 81, 81 are provided at the right end so as to project from these support pins.
A rotating member 82 is rotatably supported by the pin. this
The member 82 has a pair of lock claws 83, 83 and a knob 84.
Are integrally formed. Also, cut a part of the rotating member 82.
Receiving part 85 formed by bending and image forming unit case 6
The compression spring 87 is press-fitted between the
The spring 87 causes the rotating member 82 to move to the support pin 8
1 is urged toward the image forming unit case 60
Have been. A pair of lower frame side plates 78a, 78b are provided.
The image forming unit case is formed with locking holes 88, 88.
When the seat 60 is stored in the mounting position shown in FIG.
83 is engaged with the locking hole 88 by the action of the spring 87.
It In this case, as shown in FIG. 3, the image forming unit case 60
A compression spring 89 is provided at the lower right end of the
Since the lower end is pressed against the lever 90, the case 60 is in the mounting position.
When stowed, the case 60 is pivoted by a spring 89.
It is urged counterclockwise centering on pins 76 and 77. This
Therefore, the lock claw 83 is pressed against the upper surface of the locking hole 88,
The base 60 is securely locked. The lever 90 is fixed by the pin 91.
It is rotatably supported by the lower frame 78, and
Upper transport roller 34 for transporting copy paper 31 can be rotated
I support it. The image forming unit case 60 is the predetermined one shown in FIG.
When mounted in the position, the spring 89 moves the lever 90 as described above.
Press. As a result, the vertical transport rollers 34 and 35 are
The transfer papers are conveyed in pressure contact with each other. Image forming unit case
When 60 is lifted as shown in FIG.
Since the pressure of the spring 89 is released, the upper and lower transport rollers 3
When transfer paper gets stuck between 4 and 35, it can be easily removed
It In FIG. 4, the lower frame side plate 78 on the back side is shown.
Another frame side plate 78c is fixed to b. this
The frame side plate 78c has a main motor 92 having a main motor 92.
The motor unit 93 is attached. Main model
A drive gear 94 is fixed to the output shaft of the motor 92,
The drive gears are driven by this drive gear through an appropriate gear train.
The wheel 95 and the developing roller drive gear 96 are rotated. The image forming unit case 60 is at a predetermined position in FIG.
Shaft end gear 72 of the photoconductor 11 (see FIG. 4).
a) meshes with the photoconductor drive gear 95, while the developing roller
26 of the shaft end gear 74 (FIG. 7) is the developing roller drive gear 96.
When the main motor 92 rotates in this state
The photoconductor 11 and the developing roller 26 rotate. When the image forming unit case 60 is mounted,
The contact state between the photoconductor 11 and the developing roller 26 and the developing roller
Meshing between the shaft end gear 74 and the developing roller drive gear 96
The state is as shown in FIG. Positional relationship as shown
As a result, the drive gear 96 causes the developing roller shaft end teeth to move.
When the vehicle 74 is driven, the drive gear 96 to the shaft end gear 74,
Therefore, the acting force P on the developing roller 26 is in the vertical direction.
In this way, the operating force of the drive system should not act in the horizontal direction.
Therefore, the pressure contact force between the developing roller 26 and the photoconductor 11 is
Without being adversely affected by the acting force from the drive system
became. On the other hand, the shaft of the developing roller 26 has a gear 74 or larger.
The lock lever 101 can rotate freely as shown in FIG.
Installed. Pull on the top of the lock lever 101.
The tension spring 102 is attached to the developing unit 59.
Is not attached to the imaging unit case 60 (Fig. 4)
When the lock lever 101 is in the state of the spring 102,
It is lifted and rotated to the upper position by the urging force. The developing unit 59 is placed at a predetermined position in FIG.
When the printer unit 1 is closed,
The leaf spring 103 provided on the upper unit 1 is locked.
It abuts the lever 101 and pushes it down. Then,
The concave portion 104 of the lock lever 101 is a gear for driving the developing roller.
The lock pin 105 fixedly arranged near the 96 is shown in FIG.
As a result, the developing unit 59 is suspended as a result.
Movement in the vertical direction is restricted. Incidentally, the pin 106 of FIG.
And the slot 107 determines the range of rotation of the lock lever 101.
It is for the purpose. As described above, the acting force P on the developing roller 26 is
In the vertical direction only, and with the lock lever 101,
By restricting the vertical movement of the knit 59, the developing roller
26, the contact pressure between the photosensitive member 11 is stable, and the developing roller 2
Vibration of 6 decreased. Vibration of the developing roller 26 is small
Becomes uneven, the rotation unevenness of the photoconductor 11 becomes smaller accordingly.
Become. Thus, the jitter in the photoconductor rotation direction (sub-scanning direction)
Was greatly reduced. In this case, the lock lever 10
By the rotation of the spring 102 of No. 1, the developing unit 59
Operability at the time of putting on and taking off is not hindered. In the case of the above configuration, the above-mentioned print process is performed.
Developing unit 59, the leaf spring 103
Being pressed down by the spring force of
It In general, this configuration is sufficient, but
In order to prevent the occurrence of
It is convenient to adopt Sung. What is the leaf spring 103 in the printer upper unit 1?
A compression spring 108 is provided separately. Unit 1 on the printer
When closed, the lock lever 101 first moves the leaf spring 103 and
The lock pin is pressed by both of the compression springs 108.
It rotates until it gets hooked on the carriage 105. Lock lever 101
Once locked on the lock pin 105, the lock lever 10
1 and the spring 108, a gap is formed between the spring 108 and the spring 108.
The force does not reach the lock lever 101. That is,
The lock lever 101 has a small spring force due to the leaf spring 103.
It engages with the lock pin 105 only by itself. In this case, compress
The pressing force by Ne 108 is P ₁ , Pressed by leaf spring 103
Power P ₂ And then P ₁ Is too small, lock lever 10
1 cannot be rotated sufficiently, and the lock lever
-101 is likely to cause a lock failure, such as gear jump
May cause inconvenience. Also, P ₂ Ie pre
If the pressing force during operation is too large,
The contact pressure with the roller 26 will be adversely affected and
There is a risk. Therefore, P ₁ And P ₂ In selecting
You have to choose the best combination. In the embodiment, P ₁ = 2.
0kg, P ₂ = 300 g. In FIG. 3, the right side of the image forming unit case 60
Compression springs 109 and 110 are provided on the inner surface of the end wall.
Although it looks like one in the figure, one on the front side and one on the back side,
A total of two are provided. These springs are shown in Fig. 4 (b).
Both ends of the case 66 of the developing unit 59 are spring-loaded.
Power P ₃ , P _Four Press with. On the other hand, the non-drive of the developing unit 59
Drive unit (the side without gear 74) on the printer
The compression spring 111 is provided in the part of the gland 1. This spring 111
Is a developing unit 5 when the printer upper unit 1 is closed.
9 is a spring force P at a part on the non-driving side. _Five Push downward with
wear. Thus, the developing unit 59, and thus the developing unit
The roller 26 is pressed horizontally at two points in the direction toward the photoconductor 11.
Then push the developing roller 26 downward with a part of the non-driving side.
Since it is attached, the contact between the photoconductor 11 and the developing roller 26
The pressure is even more stable, thus obtaining a uniform density toner image.
I was able to do it. Incidentally, P ₃ , P _Four , P _Five The value of
Suitable according to the developing unit 59 and other parts
A positive value is chosen. Incidentally, in the embodiment, P ₃ = 700 g,
P _Four = 100g, P _Five = 1000 g. The developing roller shaft end gear 74 shown in FIG.
As shown in FIG. 11, the oil seal 112 and the retainer 11
3 (press fit), cushion 114, side seal 115, etc.
Developing roller via a bracket 116 containing
It is attached to 26. Running the printing process
During that time, the developing roller 26 rotates. Do not take any measures
And the toner from between the bracket 116 and the developing roller 26.
May spill. Therefore, in this embodiment,
One end of the seal 117 made of a thin material such as ethylene film
Secure the portion 118 (hatched portion) to the bracket 116, and
The seal between the casing 116 and the developing roller 26 is the seal.
The other end 119 is shown in FIG.
The developing unit 59 and pull it out further
I'm wearing it. Stick the adhesive in advance to the seal in the shaded area Q.
Apply it on the case 66 of the developing unit 59.
This is done by gluing. Complete fixation
Therefore, the plate 120 is further applied onto the adhesive portion Q,
The tip 119 of the loop 117 is folded back and the plate 120
Carry it to the top and place the plate 120 in this state.
It is recommended to press with the linter upper unit 1. Thus, leakage of toner in the radial direction is prevented.
It To completely prevent the toner from leaking in the axial direction,
A seal plate is provided between the seal 115 and the developing roller 26.
It is better to interpose 121. This seal plate 121
Has small protrusions 122a and 122b on both sides.
The side seal 115 by these small protrusions.
The hermeticity is further improved. In the embodiment, the case of the charger 12 is
The resin is molded integrally with the photoconductor unit 58 by resin.
Have been. This will reduce the number of parts and manufacturing man-hours.
There is a point. By the way, the resin used here is generally
It is an insulating material. Charge wire 13 like this
If covered only with an insulative material, discharge by the charge wire 13
The voltage at the start of power transmission becomes abnormally high, and as a result,
Current in an unspecified direction prior to normal discharge to the light body 11.
There is an inconvenience of causing a leak, that is, a so-called leak.
Also, even after the discharge to the photoconductor 11 starts,
Becomes unstable. In the conventional charger, the charge charger
The casing surrounding the ear is made of grounded conductive material.
By doing so, the above inconvenience was avoided, but this implementation
In the example, the casing is made by resin molding.
Equal compensation is required. Therefore, as shown in FIGS. 3 and 4 (a),
An opening 296 is formed in the upper part of the casing of the charging charger 12.
Open the printer upper unit 1 at the part corresponding to the opening
A ground plate 297 made of a conductive material is provided on the bottom surface of the
ing. In this way, the ground plate 297 can be used as a conventional device.
The same function as the conductive casing in
Therefore, if the leak or discharge becomes unstable,
The inconvenience of does not occur. As shown in FIG. 2, the ground plate 297 has its
The protrusion 297a is formed on the front side (the side where the operation panel 5 is located).
Has been established. This protrusion 297a is a unit on the printer.
When the printer 1 and the printer lower unit 2 are combined,
It fits into the opening 298 provided in the knit 58. This opening 2
As shown by the broken line in FIG.
The conductive plate 299 connected to the
The ground plate protrusion 297a that has entered the opening 298 of the
It is electrically connected to the shaft of the photoconductor 11 via 299.
Generally, the shaft of the photoconductor 11 is grounded,
The board 297 will also be grounded. [0052] Drive system The photoconductor 11 and the developing roller 26 are connected to the main motor 92.
Thus, being driven has already been described in connection with FIG.
However, in this embodiment, the main motor 92
It is not limited to those two members that are driven. FIG. 18 is driven by the main motor 92.
The gear train shown is shown in detail. Photoconductor drive gear 95 and
And the developing roller drive gear 96, the transport roller drive gear
97, paper feed roller drive gear 98, heating roller drive gear 9
9, and also discharge roller driving gear 100 and the like are driven.
The transport roller drive gear 97 drives the lower transport roller 35 in FIG.
Move. The paper feed roller drive gear 98 drives the paper feed roller 32.
Move. The heating roller drive gear 99 drives the heating roller 36.
Move. The discharge roller drive gear 100 is composed of the upper and lower discharge rollers 4.
Drive 0, 45. The main motor unit 93 is the main
Has a main motor driver 139 in addition to the motor 92
I have. The main motor 92 has a reference signal for constant speed control.
Crystal oscillator that produces a signal, also for constant speed control
Encoder, power circuit, which shows the actual motor speed
Then, a servo circuit or the like for performing constant speed control is required. Up
Note that the main motor driver 139 is installed on the board.
Mounted on the main motor 92.
They are attached and integrated. Such an integrated structure
What is adopted is to connect the above-mentioned devices to the main motor 92.
In order to keep the cable to a minimum and to make it compact,
It [0055] Ozone discharge device, cooling device Generally, ozone is generated by the discharge of the charger 12 or the like.
To live. This ozone is a special feature near the photoconductor 11 in the printer.
Accumulation in certain places leads to deterioration of the photoreceptor, which is not preferable.
Also, when the printer upper unit 1 is lifted,
It causes discomfort. In this embodiment, the following ozone emission device is used.
By installing the device, those inconveniences are eliminated.
It In FIG. 3, above the charger 12
An ozone blowing fan 46 is provided. This ozone blower
As shown in FIG. 13, the fan 46 is a synthetic resin upper unit.
Toward the rear side from the front surface 47a at approximately the center of the frame 47
(In the direction perpendicular to the paper surface of FIG. 3). Ozone blowing fan
Frame 47, where the frame 46 is fixed,
The ventilation opening 48 is opened. Ozone blower fan 4
When 6 rotates, as shown in FIG. 14, individual blower openings 4 are provided.
Air is evenly fed in the axial direction to the vicinity of the photoconductor 11 via
Get caught. As a result, ozone near the photoconductor is blown off
As a result, the deterioration of the photoreceptor due to ozone is prevented. Ozone delivery
The wind fan 46 rotates at the same time as the photoconductor 11 rotates.
To start. Generally, the rotation of the photoconductor 11 and the ozone source
Because it is synchronized with the lighting of the charging charger 12.
is there. Also, the timing of stopping the ozone blowing fan 46
It is set 8 to 10 seconds after the photoconductor 11 is stopped. Exposure
When the body 11 stops, the discharge from the charger 12 also stops
However, at that time, stop the ozone blower fan 46 at the same time.
To blow out enough ozone accumulated around the photoconductor 11.
I can't fly away. So it's 8-10 seconds
Continuously rotate the fan 46 to blow off ozone reliably
are doing. It should be noted that after 8 to 10 seconds, the structure of the example
If the structure is different,
It is set at an appropriate time. Left side of the ozone blowing fan 46 in FIG.
Is provided with a suction fan unit 49. Suction fan
The unit 49 has a suction fan 50 as shown in FIG.
And a holder fixed to the casing of the suction fan 50.
Having an ozone filter 52 supported by da 51
I have. When the suction fan 50 rotates, an ozone blower fan
The ozone blown off from the photoconductor 11 by 46
The ozone filter 52 is attracted to the suction fan 50.
Is discharged to the outside of the machine via. Thus the Ozo in the printer
Through the ozone filter 52
As a result, ozone is not emitted to the outside. The filter holder 51 is as shown in FIG.
Is made of a thin metal material and has a holding piece on one side.
53 is formed. Filter 52 is a wavy paper tape
Wrap in a spiral shape and fix the outermost peripheral surface with adhesive tape
It is formed into a cylindrical shape by
The paper is impregnated with carbon. Holding piece of holder 51
53 is pushed outwards by hand as shown by arrow C
Can be formed and is elastic inward from the expanded state as shown by arrow D
It is supposed to return. Filter 52 to holder 51
When attaching to the filter, first spread the holding piece 53 and
52 is pressed against the holder 51, and the holding piece 53 is in the D direction.
Turn back. As a result, the filter 52 and the holding piece 53 are separated from each other.
It is clamped by the part 47b of the ram and fixed in position.
It Costs are lower because no special fixtures are required, and
Easy to put on and take off. In FIG. 12, the paper transport relieve of the lower frame 78 is shown.
A large number of air holes 123 are formed in the sleeve 124 (details).
See below). Also, as can be seen in FIG.
Along the transport surface side of the sheet discharge guide member 42 along the transfer material transport direction.
Multiple ribs are formed on the bottom of the member.
Also has a large number of air holes 125 (more details later)
Statement). Therefore, when the suction fan 50 rotates, these holes
123, 125 and ribs of the discharge guide member 42
Further, the ozone blower fan 46
While driving, the fan passes through the photoconductor 11 and the fixing roller.
To the fixing device such as the roller 36 and the toner recovery tank 57
Outside air flows in and then is exhausted from the suction fan 50 to the outside.
Will be issued. That is, from the rib of the guide member 42 to the air hole 12
5, the photoconductor 11 from the ozone blower fan 46
Path through, path through air holes 123 in paper transport ribs 124
The exhaust flow path to the suction fan 50
It is formed. The path through the air holes 123 is shown in FIG.
The suction fan 50 along the image forming unit case 60.
Directly from the gap between the case 60 and the photoconductor 11
Some of them go around the tank 57 to the suction fan 50.
It The fixing device and the tank are controlled by the air passing through these paths.
57 is efficiently cooled. Cooling the fixing device is a constant
To prevent overheating of the receiving device itself and other devices around it
Is. It is the tank 5 that cools the toner recovery tank 57.
To prevent waste toner in 7 from melting and sticking due to heat
Is. The cover of the fixing device and the image forming unit case 60
The fixing unit and the process unit section are separated and fixed
Heat transfer from the vessel to the process unit
In addition, due to the effects of exhaust gas circulation as described above,
The heat fixing unit eliminates the adverse effects on the process unit.
Be removed. In order to improve the cooling efficiency, the image is formed in FIG.
An appropriate space is provided between the unit case 60 and the fixing device.
It is desirable to kick. Cooling due to the air flowing through this space
It is done efficiently. The suction fan 50 is an exhaust heat fan.
It is necessary to cool the fixing device etc.
Unlike the wind fan 46, it is constantly rotated. Na
If the ozone blowing fan 46 is being driven, the above description is given.
And from the flow of air shown in Fig. 14, ozone is also discharged.
This can be achieved more effectively by the fan 50. [0061] Printer case, paper transport system Each component of the printer is attached to the cover 8 and the lower frame 78.
Therefore it is surrounded. Each of these uses 1 glass fiber
For synthetic resins containing 0-20%, such as Noryl (trade name)
Therefore, it is integrally molded. Especially the lower frame 7
8 is a transfer paper transport path (see FIG. 3) as shown in FIG.
A number of ribs that are formed and arranged along the paper transport direction
It has 124. These ribs are also integrally molded
Made Of these ribs, the photoconductor unit 58
For those located below the toner recovery tank 57,
A large number of air holes 123 are formed. In addition, in FIG.
The discharge guide plate 44 in the lower frame 78 is also integrally formed.
Be done. As shown in FIG. 13, the discharge guide member 42 is
It is fixed to the side surface 47c of the upper unit frame 47. This
The paper discharge guide member 42 is also made of synthetic resin.
The plurality of air holes 125 described above are provided in the lower part. The discharge guide plate 43 shown in FIG.
Body molded. The upper paper discharge roller 45 and the lower paper discharge roller 40
The drive rollers 45a and 40a of them are as shown in FIG.
Can be attached to and detached from the upper and lower sides of the discharge guide member 42, and
On the roller shafts 126 and 127 that are rotatably supported
It is a rubber ring fitted in place. Lower roller shaft 12
A gear 128 is fixed to the shaft end of 7, and this gear is
Meshes with the paper roller drive gear 100 (see FIG. 18)
It The drive gear 100 rotates about the lower roller shaft 127.
It is supported by an arm 129 attached to the
And a compression spring 130 is attached to this arm.
It The discharge guide member 42 is a printer upper unit.
Mounted on the upper unit frame 47 of FIG. 1 (FIG. 13)
As described above, the discharge guide member 42 is attached.
When the printer upper unit 1 is closed in
The dynamic gear 100 meshes with the heating roller drive gear 99 of FIG.
Fit. At this time, the spring 130 contracts by a predetermined amount, and the gear 100
The pressure necessary for transmitting the driving force is applied between the positions 99 and 99.
Thus, when the main motor 92 rotates, the lower roller shaft 1
27 rotates and the drive paper discharge roller 40a rotates. Lower
The roller shaft 127 and the upper roller shaft 126 form the pulley 13
1, 131 and the belt 132 hung around them
Drivingly connected, and therefore the lower drive roller 40a
When rotated, the upper drive roller 45a also rotates at the same time. The discharge driving rollers 40a and 45a are shown in FIG.
Each presses the driven rollers 40b and 45b.
It In this embodiment, the driven rollers 40b and 45b are shown in FIG.
As shown, the holder 133 made of spring material lowers the bottom frame.
It is fixed to the arm 78 or the cover 8. Drive low
The rollers 40a and 45a are in pressure contact with the driven rollers 40b and 45b.
When it is opened, the arm 136 of the holder 133 bends and the spring force is increased.
Then, the pressing force required for driving the paper is generated. The slot 134 is fixed to the fixed portion of the holder 133.
It is formed, and this slot 134 is attached to the lower frame 78.
Alternatively, it may be pressed into the pin 135 protruding from the cover 8.
The holder 133 is fixed to the lower frame 78 etc. by
It No fasteners such as screws are required. Further, the driven roller 40
b and 45b have their support shafts inserted into the curved end of the arm 136.
It is supported by entering. The upper and lower roller shafts 126 and 127 are non-conductive.
It is better to mold it with an electric synthetic resin. No need for grounding
Because it will be. Also, as the discharge rollers 40a and 45a
The shaft where the rubber ring is installed has a step with respect to the other shafts.
It is good to This is to prevent the rubber ring from shifting. In FIG. 17, almost the middle of the upper roller shaft 126
A paper delivery ring 137 is lightly pressed into the center.
As shown in FIG. 20, this ring has a small protrusion 1 on its outer periphery.
38. This small protrusion is located on the upper output tray 9
Push out the rear edge of the transfer paper discharged to (Fig. 3), and then
It is intended to improve the stackability of the ejected transfer paper.
is there. A paper discharge switching claw 41 (Fig.
The relationship between 3) and the paper output switching knob 4 (Fig. 2) is as follows.
is there. In FIG. 21, the paper discharge switching claw 41 and the paper discharge switching knob are shown.
The shaft 4 is connected to the groove 4. This axis 14
Two recesses in the middle of 0 (of course, inside the lower frame 78)
The cam 141 provided with is fixed. Concave of cam 141
The part is fixed to the lower frame 78 by spring material
It is fitted to the convex portion of the formed locking member 142. this
Rotation of the cam 141 in the fitted state, that is, the switching claw 41
The rotation of is restricted. From the state shown in the drawing, turn the knob 4 as shown by the arrow F.
Then, once the locking member 142 is pushed and bent, the cam 141
When the upper concave part of the is carried to the convex part of the locking member 142,
And both are fitted and fixed in position. Upper concave of cam 141
And the lower recess are solid lines of the switching claw 41 in FIG. 3, respectively.
Position and broken line position. The large concave portion of the cam 141
The size (for example, the radius of curvature) is the size of the convex portion of the locking member 142.
It is better to be smaller than that. Because the position can be surely fixed
Is. The printer upper unit 1 is connected to the printer lower unit.
As described above, it can be lifted and rotated from the toe 2.
This rotation is shown in FIG. 28 under the printer lower unit 2.
Centering on the hinge pin 238 fixed to the frame 78
Rotate the upper unit frame 47 of the printer upper unit 1
It is done by moving. Hold the upper unit 1
Easy maintenance work when removing jammed paper in case of peeling
It is necessary to lift at such a large angle as when doing
There may be no. In consideration of such cases, the hinge
Slide the pin 238 into the lower frame 78 on the far side (right side in the figure).
The top pin 246 is placed and the upper frame 47 is
When the racket 247 hits this stop pin 246
If the rotation of the upper frame 47 is restricted by
It is convenient. The stop pin 246 is attached to the lower frame 78.
It is detachable with respect to the photoconductor unit 58 and
And printer unit 59 such as when replacing development unit 59.
If you need to lift the stand 1
Remove the top pin 246 from the lower frame 78 and
Rame 47 can be lifted up to a right angle
It would be even more convenient if possible. To have such a two-stage rotation structure
Thus, the convenience of the operator can be achieved. [0075] Vertical unit lock mechanism In FIG. 2, the printer upper unit 1 is shown in the open position.
When the printer is closed as indicated by arrow G, the printer will be in the state shown in FIG.
It becomes possible to print. However, the actual printing
When moving, lock the upper and lower units 1 and 2 in this state.
Need to The mechanism for that is explained below
To do. In FIG. 13, the upper unit frame 47
Lever support brackets 143, 143 and front surface 47a
And lever holding plates 144, 144 are made of resin
It is provided. Lever support brackets 143, 143
Supports both end support shafts 146 and 146 of the lock lever 145.
To have. At this time, the upper side of the support shafts 146 and 146 is the holding plate 1.
It is pressed downward by 44 and 144. Holding plate 144
Is made of resin and has flexibility, the support shaft 14
6 is inserted into the bracket 143, the pressing plate 14
The insertion work is performed while pushing 4 upward. Support
When the shaft 146 enters the recess of the bracket 143, the holding plate 1
44 automatically moves downward to return to the lock lever 14
Hold the whole 5. Upper unit frame of lock lever 145
The support shaft 146 is attached to the support shaft 146 in order to facilitate the attachment to the ram 47.
It is also possible to provide an axial slot. At this time, the lock lever 145 is attached to the support shaft 146.
Although it can be rotated around the
At the upper part, the spring material 14 is projected so as to project toward the frame 47.
Since 7, 147 is attached in advance, in front of the frame
The lock lever 145 attached to the surface 47a is in the direction of arrow H.
It is urged to rotate to. The spring material 147 is a leaf spring.
Also, the lock lever 145 is made of resin with spring property.
You may form integrally with the whole. At the bottoms of both ends of the lock lever 145, respectively,
The locking claws 148 and 148 are integrally formed.
I have. As shown in FIG. 12, that of the lower frame 78
The hooks 149, 14 at positions corresponding to the lock claws 148.
9 is integrally formed. Unit on printer 1
When the lock lever 1 is closed
45 locking claws 148 automatically fit into the holes in the hooks 149
That is, the upper unit 1 is locked, that is, fixed. The
When lifting the linter upper unit 1, first lock
Pinch the bar knob 10 and use it to press the spring force of the spring member 147.
Rotate upwards against. Then, with the lock claw 148
The engagement with the hook 149 is released, and
You can lift the unit 1. Lock lever knob
10 is the outside from the opening 248 provided in the front surface of the cover 8.
It is overhanging. Conventionally, when making such a lock mechanism,
Complex structure such as attaching knobs and claws to the metal shaft
There were many structures. On the other hand, in this embodiment,
It is lightweight and easy to make. or,
Grounding is also unnecessary. The stopper 312 is the lock lever 1
45 integrally formed with the spring 45,
Like the material 147, it projects toward the case 47. this is
The lock lever 145 is rotated too much and the spring member 147 is bent.
To prevent the lock lever 145 from rotating
It is for limiting. Below the support brackets 143, 143,
Positioning protrusions 150, 150 in the paper transport direction and the photoconductor shaft
Directional positioning projections 151 and 151 are aligned with the frame 47.
It is molded. Of these protrusions, on the right side of FIG.
One set engages the hook 149 on the right side of FIG.
The state of engagement is shown in FIG. Both protrusions are that
By engaging one hook 149 with each,
The frame 47 is in the photoconductor axial direction (the main scanning direction of the laser).
Direction) and the paper transport direction (laser sub-scanning direction)
It can be surely prevented. [0081] Laser optics 5 and 6 for the laser optical device 14 (FIG. 3).
In the above, an example thereof was given to explain the general operation. this
In the example, the optical path of the laser beam is kept normal.
Therefore, the first mirror 19 and the third mirror 23 are case 155.
Must be fixed exactly perpendicular to the In this embodiment, as shown in FIG. 23, the case
155 (FIG. 5) and a support portion 156 integrally formed,
The first mirror 19 and the like by means of the pressing plate 157 made of a bed material
Is fixed. In this case, regarding the support portion 156, the first
The surface 156a against which the mirror 19 is pressed is accurately vertical
Has been finished. The mirror 19 is placed on the vertical surface 156a.
And press the arm 157 of the holding plate 157 from the rear.
a, 157a pushes the mirror 19 to the vertical surface 156a.
Discipline. The arm 157a of the holding plate 157 is the holding plate 1
57 screw it into place on the case 155 through the hole 158.
When stopped, the mirror 19 is pressed by flexural deformation
It is like this. At that time, the arm 157a is not
The small protrusions 159, 159 protruding in the direction of the rail 19 are provided.
Therefore, the mirror 19 is pressed through these small protrusions.
It is done by two points. By pressing these two points,
The rail 19 is securely positioned by the vertical surface 156a.
It A second series, shown briefly in FIGS. 3 and 6.
The overall shape of the cylindrical lens 22 is the lower part of FIG.
The position is shown. This is the lens part
It is also made by resin integral molding. This syrin
The drical lens 22 is the front surface 4 of the upper unit frame 47.
7a through the opening 249 provided in the upper unit shown in FIG.
It can be inserted in place in the frame 47 and pulled from it.
Can be pulled out. Cylindrical ren inserted in place
22 acts as an optical lens and also serves as an optical device.
A sheet to prevent toner and other dust from entering inside 14.
Also acts as a ruler member. Therefore, the cylindrical
Fitting the lens 22 and the corresponding portion of the upper unit frame 47
Should be as airtight as possible. Mounting means for the second cylindrical lens 22
As an example, there is the following. As shown in Figure 33
The second cylindrical lens 22 has an upper unit frame.
Two parallel side walls 304 that define the hole 303 of the frame 47,
It is arranged inside 304. On the upper unit frame 47
A second cylinder is formed on both sides of each side wall 304 formed integrally.
Each side edge 22b in the longitudinal direction of the drical lens 22,
Upper and lower support portions 305 that slidably guide 22b, and
306 is formed integrally with the upper unit frame 47.
The second cylindrical lens 22 has a support portion
It is supported by being sandwiched between 305 and 306. Upper and lower support portions 305, 30 of each side wall 304
6 are arranged in a staggered pattern, but this is the upper unit frame
It is for facilitating the die cutting at the time of molding the frame 47.
If the frame 47 can be molded, a supporting part is used as an example.
For example, even if it is formed in an appropriate shape such as parallel guide rails,
good. Set the second cylindrical lens 22
As shown in FIG. 34, the second cylindrical lens
On both locking parts 307, 307 formed at the tip of the
The elastic piece 308 integrally formed with the knit frame 47 is engaged.
By doing this, the second cylindrical lens 22 is removed
The delivery is blocked. Also, it is integrally bridged to both side walls 304.
The second cylindrical lens 22 to the stopper 309.
The installed control piece 310 hits, and the second cylindrical
The lens 22 is pushed in further than the specified set position.
And are blocked. Cleaning of the second cylindrical lens 22 or
When pulling this out for replacement, use the knob 22a.
Then pull in the direction of arrow T. In this way, both elastic pieces 3
Reference numeral 08 denotes a bulge 3 at the tip of the second cylindrical lens 22.
Elastically expanded by 11 and the second cylindrical recording
Through the opening 249 in the upper unit frame 47.
Be pulled out. The knob 22a is a second cylindrical carlene.
When the lock 22 is mounted in place, the lock lever knob
Like the case 10, it is exposed to the outside through the opening 248 of the cover 8.
Since the opening 248 can be shared in this way, the appearance is impaired.
Moreover, workability is also good. Installed on the right side of the ozone fan 46 in FIG.
The beam shutter 258, which is removed, is centered on the pin 259.
Can be rotated as. Upper / lower unit 1 as shown in FIG.
And 2 are closed, this beam shutter 258
On the protrusion 250 (FIG. 4A) on the photoconductor unit 58.
Therefore, it is pushed up and rotated, and the laser beam irradiation port 251
is open. Lift up the printer unit 1 to project
The engagement between the beam shutter 258 and the beam shutter 258 is released,
The beam shutter rotates to the right and the laser beam irradiation port 2
Close 51. In this embodiment, interlocks to be described later
The unit on the printer is lifted by the action of the switch.
Then, the power supply to the laser optical device 14 is cut off and the laser beam
It is supposed that the
The above-mentioned beam shutter in consideration of the malfunction of the lock switch 4.
258 is provided to ensure safety. Further, the upper unit frame of the printer upper unit 1
Corresponding to the laser beam irradiation opening 251 in the frame 47
In place, the shielding member 25 made of an elastic material such as rubber or sponge
2 is fixed (see FIG. 2). Upper / lower unit 1 and
2 and 2 are closed, as shown in FIG.
The lower end of the developing unit 58 in the printer lower unit 2
(Refer to FIG. 4 (a)) is pressed against the upper surface, and thus the shielding portion
The material seals the periphery of the laser irradiation port 251.
As a result, the toner and other toner in the laser optical device 14 are
Intrusion of light, leakage of laser light, intrusion of light from the outside, etc.
To be prevented. [0092] Paper supply / delivery section The paper feed tray 3 can be freely attached to and detached from the printer lower unit 2.
Is. As can be seen from FIG. 1, this paper feed tray 3 is
The portion 153 provided with the pressing lever 152 is stretched downward.
The bottom is not flat because it is protruding. Therefore, the paper feed tray
If you remove A3 from the lower unit 2 and leave it for a while, the tray
The rear part of 3 descends downward like a seesaw and the transfer paper is rearward
It may fall off. In order to prevent this, FIG.
As shown in FIG.
54 should be provided. As a result, the paper tray 3
It sits better and eliminates paper slippage. The manual feed guide plate 2 is provided above the paper feed tray 3.
55 is attached to this manual feed guide plate 255
So that the transfer material can be manually fed from above
(Arrow M in FIG. 3). Put plain paper on the paper tray 3.
Stack the paper sheets, and then insert the envelope from the manual feed guide plate 255.
If you want to manually feed the
It is also possible to carry out the address book one by one alternately. Further, the printer according to the present embodiment has a configuration shown in FIG.
At the bottom of the printer lower unit 2 as shown in
The tab 266 can be detachably connected. This paper feed
A spare paper feed tray 267 is installed in the unit 266.
And a plurality of transfer papers 268 are placed on the tray 267.
It is loaded. These transfer papers 268 are paper feed rollers.
1 as indicated by arrow N by 269 and the conveyance roller 270.
The sheets are fed one by one into the printer lower unit 2. Sent
The transfer paper undergoes the above-mentioned printing process.
Is the same as the transfer paper 31 on the paper feed tray 3.
Yes. Paper is fed from the paper feed tray 3 or
Or whether to feed paper from the spare paper feed tray 267.
Instructed by providing a selection switch for that on the work panel 5.
Or according to instructions from the host computer.
Be done. As can be seen from the figure, the lower paper feed tray 2
67 to the upper and lower transport rollers 3 in the printer lower unit 2
Paper feed distances from paper feed tray 3
It is longer than the paper conveyance distance to the rollers 34 and 35. on the other hand,
In order to execute the printing process, both paper feed trays 3 and
And 267 are the transfer papers from the upper and lower transport rollers.
The time to reach 34,35 must be equal
Yes. Therefore, the auxiliary paper feed roller 269 of the embodiment is a printer
Delivery speed faster than the paper feed roller 32 in the lower unit 2
The transfer paper 267 is sent out every time. The transfer paper after printing is the upper discharge tray.
The paper is discharged to 9 and stacked. The upper output tray 9 is deep
That is, from the upper paper ejection tray 9 to the upper paper ejection roller 45
The higher the height h is, the more sheets can be stacked.
Get However, if this is too deep, the transferred transcription
The paper is disturbed, and the entire printer becomes unnecessarily large. Yo
Therefore, there is a limit to the number of transfer paper stacks
It However, the above-mentioned auxiliary paper feed tray 267 is
In the case of the embodiment used, stacking should be done on the upper paper discharge tray 9.
It is conceivable that the number of transfer sheets will greatly increase. others
Therefore, it is convenient to adopt the following configuration. As shown in FIG. 30, the upper and lower units of the printer are
A discharge unit 271 is attached to the left side of the knits 1 and 2.
It The paper discharge unit 271 includes a main body case 272,
It is pivotally supported by a pin 273 so as to be rotatable in the direction of arrow P.
The cover 274 is formed. Cover 274 is transparent
Vertically shown in FIG. 30 by a locking device not always shown
Is held in a state. Cover 274 and main body case 2
72 are spaced from each other in the direction perpendicular to the plane of FIG.
A plurality of ribs 275, 276, 277 arranged are attached.
These ribs form the transfer paper discharge path 278.
Have been. The main body case 272 has conveyance rollers 279, 2
80 and the discharge roller 281 are supported, and
The transfer paper is conveyed and discharged by each roller. The transfer paper is conveyed through the paper discharge unit 271.
When doing so, the paper discharge switching claw 41 is switched to the broken line position. this
The transfer paper sent from the discharge roller 40 is conveyed by
It is sent to the paper discharge unit 271 via the roller 279.
It From the discharge tray 9 to the discharge unit 271
The height H to the paper ejection roller 281 is
Higher than height h up to 45 (H> h). Therefore transfer paper
More paper is ejected from the paper ejection unit 271,
It is possible to stack the transfer papers. in this case,
As a method of ejecting paper,
Paper is ejected using the paper roller 45, and the transfer paper is ejected on top of it.
When the paper is stacked up to the height of the paper roller 45, the paper is ejected.
Start discharging by the discharge roller 281 of the unit 271
To do. By doing this, the paper is discharged from the paper discharge unit 271.
The situation that the transfer paper is dropped to a deep position is avoided.
Therefore, there is no irregularity in the stacked transfer sheets. In some cases, the paper discharge unit 271
Paper discharge roller 281 only or printer upper unit
You may use only the upper discharge roller 45 of 1. Also, these
It is also possible to alternately use the discharge rollers 281 and 45 of
It The printer upper unit 1 of the embodiment is a printer.
It is lifted and rotated with respect to the lower unit 2. However,
As shown in FIG. 30, the upper part of the paper discharge unit 271 is on the printer.
If it is located above the unit 1, it will be ejected as it is.
The unit 271 interferes with the printer unit 1
I can't lift. Therefore, in the example shown in the figure,
271 is the paper feeding unit 266 (the printer lower unit 2
In the direction of arrow Q via pin 282.
It is rotatably supported. Open the printer unit 1
When closed, the paper discharge unit 271 is moved to the upper and lower units 1 and 2.
In contrast, it is rotated in the Q direction, and this is the printer upper unit 1
Retract to a position that does not interfere with opening and closing. In addition,
The knit 271 can be freely attached to and detached from the paper feeding unit 266, etc.
This is used when opening and closing the printer upper unit 1.
It can also be removed. In the paper discharge path 278 of the paper discharge unit 271
If the transfer paper causes a jam, pin the cover 274.
It rotates in the P direction around 273, and this is shown in FIG.
Move to the desired position. As a result, the paper discharge path 278 is exposed to the outside.
Exposed, so you can easily remove jammed paper
It Pre-cut to the downstream position of the lower conveying roller 279.
A replacement claw 283 is provided. This switching claw 283 is shown in FIG.
Switched between the position shown in 0 and the position shown in FIG.
It When the preliminary switching claw 283 is at the position shown in FIG.
Paper is discharged to the upper paper discharge tray 9. On the other hand, spare cut
When the replacement claw 283 is at the position shown in FIG. 31, the transfer paper is conveyed downward.
It is discharged from the roller 279 onto the cover 274. Transcription
If you don't want to reverse the paper,
Is adopted. The cover 274 itself serves as an output tray
Since they can be used in common, the number of parts can be reduced. Also, preliminary switching is performed in conjunction with opening / closing of the cover 274.
If the configuration is such that the switching operation of the claw 283 can be obtained, the operation is
It is simple and advantageous. For example, opening and closing the cover 274
Provide a switch (not shown) that turns on and off with
When the cover 274 is opened to the position shown in FIG.
Turn on the switch of the
Actuating a drive device such as a solenoid or a solenoid, the preliminary switching claw 2
83 from the position of FIG. 30 to the position of FIG. 31, and vice versa
Even when the cover 274 is closed, the operation of the above-mentioned driving device will cause
The equipment switching claw 283 is returned to the position shown in FIG. There is also the following method. Figure 30 and Figure
A cam member 284 is fixed to the cover 274 as shown in FIG.
However, when the cover 274 is closed, the toggle spring 285
By the action, the preliminary switching claw 283 is held at the position shown in FIG.
It When the cover 274 is opened, the cam member 28 integral with the cover 274 is opened.
4 hits the preliminary switching claw 283 to pressurize it, and
Rotate to the position. The preliminary switching claw 283 is the toggle spring 28.
This state is held by 5. Paper discharge roller 281 of paper discharge unit 271
Inside the upper and lower printer units 1 and 2 as shown in FIG.
It can be configured in the same manner as the paper discharge rollers 40 and 45. or,
It is more convenient to do as shown in FIG. Paper output in the figure
The roller 281 includes a driving roller 286 and a driven roller 287.
Drive roller 286 is fixed to its supporting shaft 288.
Driven gear 289 and drive gear 290 meshing with the driven gear 289
It is rotationally driven via. Connecting member 29 on the support shaft 288
1, mounted so as to be rotatable but not axially slidable
I have. A nut 292 is provided at the other end of the connecting member 291.
The nut 292 is rotated by the reversible motor 293.
It is engaged with a feed screw 294 that is rotationally driven. With the motor 293 stopped, the transfer paper is raised.
The position of the transfer paper when it is ejected to the partial ejection tray 9 is shown in FIG.
It is assumed that the position is indicated by the chain line. In this state, some rolls
After stacking the copy paper, activate the motor 293 to feed it.
Rotate the screw 294. Then, the nut 292 is fed.
Move in the axial direction of the screw 294 and drive the drive wire accordingly.
La 286 also moves in the same direction, resulting in roller 286.
And the transfer paper sandwiched by 287 is displaced by δ as shown by the broken line.
(Shift). The transfer paper thus displaced by δ is placed on the upper side.
If the paper is ejected to the paper ejection tray 9, the paper is ejected onto the tray 9 before that.
It can be distinguished from the discharged transfer paper group. Tsuma
It is possible to divide multiple transfer papers into several bundles.
It Actually, as shown in FIG.
A sensor 295 is provided on the upstream side of the 281 to shift the transfer paper.
An external signal to be input is input to the main controller described later.
Sensor 295 detects the trailing edge of the transfer paper when
At this time, the motor 293 is operated based on the detection signal,
The drive roller 286 is shifted. [0112] Electrical components In FIG. 24, reference numeral 160 is a power input section, which is an AC plug
It is connected to a commercial power source via 161. Mei in this
Switch 162 and noise filter 163 are included.
It As shown in FIG. 12, the power input section 160 has a lower frame.
It is arranged on the back side of the frame 78. Main switch 162 is down
It penetrates the side wall of the frame 78 and goes out to the outside.
The operator can perform switching operations. Noise fill
The filter 163 removes external noise from the supplied power. One of the power from the power input section 160 is
Main controller via the interlock switch 164.
Is supplied to the electric power supply unit (main PSU) 165 for electric power, etc.
One is the power supply for the character controller (character
CU PSU) 166. Main PSU165
On the left side of the upper unit frame 47 as shown in FIG.
The noise filter 167 and the constant voltage are arranged.
It has a circuit 168 and a semiconductor relay (SSR) 169.
It The constant voltage circuit 168 mainly performs AC / DC conversion.
The SSR 169 is a heater 38 (FIG. 3) in the heating roller 36.
Turns on / off the power supply for the temperature control. heater
No. 38 shows the thermist for temperature control as can be seen from FIG.
A thermistor 235 is attached, but this thermistor 235
When a minimum width transfer material such as an envelope is applied as the copying material,
It is installed at the upper position corresponding to the transfer path of the minimum width transfer material.
It The reason is that generally envelopes are made by gluing
However, if the fixing temperature is too high, the glue will melt and malfunction.
Occurs. Therefore, set the thermistor 235 to the minimum width of an envelope or the like.
Accurate by placing the transfer material closest to where it will pass
This is because it is possible to perform various heater temperature controls. The interlock switch 164 is shown in FIG.
As shown in the figure, it is installed on the right front side of the lower frame 78 and
It is normally off and turns on when pushed down.
The right end of the lower frame 78 when the printer is assembled
An inner cover 170 made of resin is attached to the. this
Allows the interlock switch 164 to move to the inner cover.
-170 of the switch cover 171. S
A cross-shaped hole 172 is formed in the switch cover 171.
I have. This cross hole does not allow human fingers to enter,
Appropriately shaped press provided on the corresponding part of the unit 1
The child 173 (Fig. 2) is large enough to fit in.
ing. Therefore, as shown in FIG.
Interlock switch 16 when is lifted
4 is turned off and power is not supplied to the main PSU,
When the upper unit 1 is closed,
Turlock switch 164 turns on and power is supplied.
Be done. The cross hole 172 does not allow people's fingers to pass through.
The reason is that when upper unit 1 is open,
-To prevent the lock switch 164 from turning on
It is. When the interlock switch 164 is turned off,
Power supply to the laser optical device 14 is cut off and the laser beam is illuminated.
As described above, the shooting is interrupted. With the inner cover 170 attached,
As shown in FIG. 3, the sheet feeding roller 32 is covered.
I have. As a result, dust or the like adheres to the paper feed roller 32.
Paper feed when the upper unit 1 is lifted
The roller 32 is protected. The character PSU166 is shown in FIG.
It is arranged on the right rear side of the upper unit frame 47.
As shown in FIG. 24, the noise filter 17
4. A constant voltage circuit 175 is provided. The main PSU 165 is the main controller.
LA 176, charging charger 12, and developing bias power
-Pack (Charging / Development PP) 177, Transfer Charger 3
0 power pack (transfer PP) 178, main motor 9
2. Drive various operating devices 179 and the like. In addition,
Fan 46, suction fan 50, etc., and fixing unit heater 3
Drive eight. Character PSU166 is a character
The controller 180 is driven. At the bottom of both ends of the lock lever 145, respectively,
The locking claws 148 and 148 are integrally formed.
I have. As shown in FIG. 12, that of the lower frame 78
The hooks 149, 14 at positions corresponding to the lock claws 148.
9 is integrally formed. Unit on printer 1
When the lock lever 1 is closed
45 locking claws 148 automatically fit into the holes in the hooks 149
That is, the upper unit 1 is locked, that is, fixed. The
When lifting the linter upper unit 1, first lock
Pinch the bar knob 10 and use it to press the spring force of the spring member 147.
Rotate upwards against. Then, with the lock claw 148
The engagement with the hook 149 is released, and
You can lift the unit 1. Lock lever knob
10 is the outside from the opening 248 provided in the front surface of the cover 8.
It is overhanging. Conventionally, when making such a lock mechanism,
Complex structure such as attaching knobs and claws to the metal shaft
There were many structures. On the other hand, in this embodiment,
It is lightweight and easy to make. or,
Grounding is also unnecessary. The stopper 312 is the lock lever 1
45 integrally formed with the spring 45,
Like the material 147, it projects toward the case 47. this is
The lock lever 145 is rotated too much and the spring member 147 is bent.
To prevent the lock lever 145 from rotating
It is for limiting. Below the support brackets 143 and 143,
Positioning protrusions 150, 150 in the paper transport direction and the photoconductor shaft
Directional positioning projections 151 and 151 are aligned with the frame 47.
It is molded. Of these protrusions, on the right side of FIG.
One set engages the hook 149 on the right side of FIG.
The state of engagement is shown in FIG. Both protrusions are that
By engaging one hook 149 with each,
The frame 47 is in the photoconductor axial direction (the main scanning direction of the laser).
Direction) and the paper transport direction (laser sub-scanning direction)
It can be surely prevented. [0121] Laser optics 5 and 6 for the laser optical device 14 (FIG. 3).
In the above, an example thereof was given to explain the general operation. this
In the example, the optical path of the laser beam is kept normal.
Therefore, the first mirror 19 and the third mirror 23 are case 155.
Must be fixed exactly perpendicular to the In this embodiment, as shown in FIG. 23, the case
155 (FIG. 5) and a support portion 156 integrally formed,
The first mirror 19 and the like by means of the pressing plate 157 made of a bed material
Is fixed. In this case, regarding the support portion 156, the first
The surface 156a against which the mirror 19 is pressed is accurately vertical
Has been finished. The mirror 19 is placed on the vertical surface 156a.
And press the arm 157 of the holding plate 157 from the rear.
a, 157a pushes the mirror 19 to the vertical surface 156a.
Discipline. The arm 157a of the holding plate 157 is the holding plate 1
57 screw it into place on the case 155 through the hole 158.
When stopped, the mirror 19 is pressed by flexural deformation
It is like this. At that time, the arm 157a is not
The small protrusions 159, 159 protruding in the direction of the rail 19 are provided.
Therefore, the mirror 19 is pressed through these small protrusions.
It is done by two points. By pressing these two points,
The rail 19 is securely positioned by the vertical surface 156a.
It The second series, shown briefly in FIGS. 3 and 6.
The overall shape of the cylindrical lens 22 is the lower part of FIG.
The position is shown. This is the lens part
It is also made by resin integral molding. This syrin
The drical lens 22 is the front surface 4 of the upper unit frame 47.
7a through the opening 249 provided in the upper unit shown in FIG.
It can be inserted in place in the frame 47 and pulled from it.
Can be pulled out. Cylindrical ren inserted in place
22 acts as an optical lens and also serves as an optical device.
A sheet to prevent toner and other dust from entering inside 14.
Also acts as a ruler member. Therefore, the cylindrical
Fitting the lens 22 and the corresponding portion of the upper unit frame 47
Should be as airtight as possible. Mounting means for the second cylindrical lens 22
As an example, there is the following. As shown in Figure 33
The second cylindrical lens 22 has an upper unit frame.
Two parallel side walls 304 that define the hole 303 of the frame 47,
It is arranged inside 304. On the upper unit frame 47
A second cylinder is formed on both sides of each side wall 304 formed integrally.
Each side edge 22b in the longitudinal direction of the drical lens 22,
Upper and lower support portions 305 that slidably guide 22b, and
306 is formed integrally with the upper unit frame 47.
The second cylindrical lens 22 has a support portion
It is supported by being sandwiched between 305 and 306. Upper and lower support portions 305, 30 of each side wall 304
6 are arranged in a staggered pattern, but this is the upper unit frame
It is for facilitating the die cutting at the time of molding the frame 47.
If the frame 47 can be molded, a supporting part is used as an example.
For example, even if it is formed in an appropriate shape such as parallel guide rails,
good. Set the second cylindrical lens 22
As shown in FIG. 34, the second cylindrical lens
On both locking parts 307, 307 formed at the tip of the
The elastic piece 308 integrally formed with the knit frame 47 is engaged.
By doing this, the second cylindrical lens 22 is removed
The delivery is blocked. Also, it is integrally bridged to both side walls 304.
The second cylindrical lens 22 to the stopper 309.
The installed control piece 310 hits, and the second cylindrical
The lens 22 is pushed in further than the specified set position.
And are blocked. Cleaning of the second cylindrical lens 22 or
When pulling this out for replacement, use the knob 22a.
Then pull in the direction of arrow T. In this way, both elastic pieces 3
Reference numeral 08 denotes a bulge 3 at the tip of the second cylindrical lens 22.
Elastically expanded by 11 and the second cylindrical recording
Through the opening 249 in the upper unit frame 47.
Be pulled out. The knob 22a is a second cylindrical carlene.
When the lock 22 is mounted in place, the lock lever knob
Like the case 10, it is exposed to the outside through the opening 248 of the cover 8.
Since the opening 248 can be shared in this way, the appearance is impaired.
Moreover, workability is also good. Installed on the right side of the ozone fan 46 in FIG.
The beam shutter 258, which is removed, is centered on the pin 259.
Can be rotated as. Upper / lower unit 1 as shown in FIG.
And 2 are closed, this beam shutter 258
On the protrusion 250 (FIG. 4A) on the photoconductor unit 58.
Therefore, it is pushed up and rotated, and the laser beam irradiation port 251
is open. Lift up the printer unit 1 to project
The engagement between the beam shutter 258 and the beam shutter 258 is released,
The beam shutter rotates to the right and the laser beam irradiation port 2
Close 51. In this embodiment, interlocks to be described later
The unit on the printer is lifted by the action of the switch.
Then, the power supply to the laser optical device 14 is cut off and the laser beam
It is supposed that the
The above-mentioned beam shutter in consideration of the malfunction of the lock switch 4.
258 is provided to ensure safety. Further, the upper unit frame of the printer upper unit 1 is
Corresponding to the laser beam irradiation opening 251 in the frame 47
In place, the shielding member 25 made of an elastic material such as rubber or sponge
2 is fixed (see FIG. 2). Upper / lower unit 1 and
2 and 2 are closed, as shown in FIG.
The lower end of the developing unit 58 in the printer lower unit 2
(Refer to FIG. 4 (a)) is pressed against the upper surface, and thus the shielding portion
The material seals the periphery of the laser irradiation port 251.
As a result, the toner and other toner in the laser optical device 14 are
Intrusion of light, leakage of laser light, intrusion of light from the outside, etc.
To be prevented. [0132] Paper supply / delivery section The paper feed tray 3 can be freely attached to and detached from the printer lower unit 2.
Is. As can be seen from FIG. 1, this paper feed tray 3 is
The portion 153 provided with the pressing lever 152 is stretched downward.
The bottom is not flat because it is protruding. Therefore, the paper feed tray
If you remove A3 from the lower unit 2 and leave it for a while, the tray
The rear part of 3 descends downward like a seesaw and the transfer paper is rearward
It may fall off. In order to prevent this, FIG.
As shown in FIG.
54 should be provided. As a result, the paper tray 3
It sits better and eliminates paper slippage. The manual feed guide plate 2 is provided above the paper feed tray 3.
55 is attached to this manual feed guide plate 255
So that the transfer material can be manually fed from above
(Arrow M in FIG. 3). Put plain paper on the paper tray 3.
Stack the paper sheets, and then insert the envelope from the manual feed guide plate 255.
If you want to manually feed the
It is also possible to carry out the address book one by one alternately. Further, the printer according to the present embodiment has the configuration shown in FIG.
At the bottom of the printer lower unit 2 as shown in
The tab 266 can be detachably connected. This paper feed
A spare paper feed tray 267 is installed in the unit 266.
And a plurality of transfer papers 268 are placed on the tray 267.
It is loaded. These transfer papers 268 are paper feed rollers.
1 as indicated by arrow N by 269 and the conveyance roller 270.
The sheets are fed one by one into the printer lower unit 2. Sent
The transfer paper undergoes the above-mentioned printing process.
Is the same as the transfer paper 31 on the paper feed tray 3.
Yes. Whether paper is fed from the paper feed tray 3 or not
Or whether to feed paper from the spare paper feed tray 267.
Instructed by providing a selection switch for that on the work panel 5.
Or according to instructions from the host computer.
Be done. As can be seen from the figure, the lower paper feed tray 2
67 to the upper and lower transport rollers 3 in the printer lower unit 2
Paper feed distances from paper feed tray 3
It is longer than the paper conveyance distance to the rollers 34 and 35. on the other hand,
In order to execute the printing process, both paper feed trays 3 and
And 267 are the transfer papers from the upper and lower transport rollers.
The time to reach 34,35 must be equal
Yes. Therefore, the auxiliary paper feed roller 269 of the embodiment is a printer
Delivery speed faster than the paper feed roller 32 in the lower unit 2
The transfer paper 267 is sent out every time. The transfer paper after printing is the upper discharge tray.
The paper is discharged to 9 and stacked. The upper output tray 9 is deep
That is, from the upper paper ejection tray 9 to the upper paper ejection roller 45
The higher the height h is, the more sheets can be stacked.
Get However, if this is too deep, the transferred transcription
The paper is disturbed, and the entire printer becomes unnecessarily large. Yo
Therefore, there is a limit to the number of transfer paper stacks
It However, the above-mentioned auxiliary paper feed tray 267 is
In the case of the embodiment used, stacking should be done on the upper paper discharge tray 9.
It is conceivable that the number of transfer sheets will greatly increase. others
Therefore, it is convenient to adopt the following configuration. As shown in FIG. 30, the upper and lower units of the printer are
A discharge unit 271 is attached to the left side of the knits 1 and 2.
It The paper discharge unit 271 includes a main body case 272,
It is pivotally supported by a pin 273 so as to be rotatable in the direction of arrow P.
The cover 274 is formed. Cover 274 is transparent
Vertically shown in FIG. 30 by a locking device not always shown
Is held in a state. Cover 274 and main body case 2
72 are spaced from each other in the direction perpendicular to the plane of FIG.
A plurality of ribs 275, 276, 277 arranged are attached.
These ribs form the transfer paper discharge path 278.
Have been. The main body case 272 has conveyance rollers 279, 2
80 and the discharge roller 281 are supported, and
The transfer paper is conveyed and discharged by each roller. Conveying the transfer paper through the paper discharge unit 271
When doing so, the paper discharge switching claw 41 is switched to the broken line position. this
The transfer paper sent from the discharge roller 40 is conveyed by
It is sent to the paper discharge unit 271 via the roller 279.
It From the discharge tray 9 to the discharge unit 271
The height H to the paper ejection roller 281 is
Higher than height h up to 45 (H> h). Therefore transfer paper
More paper is ejected from the paper ejection unit 271,
It is possible to stack the transfer papers. in this case,
As a method of ejecting paper,
Paper is ejected using the paper roller 45, and the transfer paper is ejected on top of it.
When the paper is stacked up to the height of the paper roller 45, the paper is ejected.
Start discharging by the discharge roller 281 of the unit 271
To do. By doing this, the paper is discharged from the paper discharge unit 271.
The situation that the transfer paper is dropped to a deep position is avoided.
Therefore, there is no irregularity in the stacked transfer sheets. In some cases, the paper discharge unit 271
Paper discharge roller 281 only or printer upper unit
You may use only the upper discharge roller 45 of 1. Also, these
It is also possible to alternately use the discharge rollers 281 and 45 of
It The printer upper unit 1 of the embodiment is a printer.
It is lifted and rotated with respect to the lower unit 2. However,
As shown in FIG. 30, the upper part of the paper discharge unit 271 is on the printer.
If it is located above the unit 1, it will be ejected as it is.
The unit 271 interferes with the printer unit 1
I can't lift. Therefore, in the example shown in the figure,
271 is the paper feeding unit 266 (the printer lower unit 2
In the direction of arrow Q via pin 282.
It is rotatably supported. Open the printer unit 1
When closed, the paper discharge unit 271 is moved to the upper and lower units 1 and 2.
In contrast, it is rotated in the Q direction, and this is the printer upper unit 1
Retract to a position that does not interfere with opening and closing. In addition,
The knit 271 can be freely attached to and detached from the paper feeding unit 266, etc.
This is used when opening and closing the printer upper unit 1.
It can also be removed. In the paper discharge path 278 of the paper discharge unit 271
If the transfer paper causes a jam, pin the cover 274.
It rotates in the P direction around 273, and this is shown in FIG.
Move to the desired position. As a result, the paper discharge path 278 is exposed to the outside.
Exposed, so you can easily remove jammed paper
It Pre-cut to the downstream position of the lower conveying roller 279.
A replacement claw 283 is provided. This switching claw 283 is shown in FIG.
Switched between the position shown in 0 and the position shown in FIG.
It When the preliminary switching claw 283 is at the position shown in FIG.
Paper is discharged to the upper paper discharge tray 9. On the other hand, spare cut
When the replacement claw 283 is at the position shown in FIG. 31, the transfer paper is conveyed downward.
It is discharged from the roller 279 onto the cover 274. Transcription
If you don't want to reverse the paper,
Is adopted. The cover 274 itself serves as an output tray
Since they can be used in common, the number of parts can be reduced. In addition, a preliminary switching is performed in conjunction with the opening and closing of the cover 274.
If the configuration is such that the switching operation of the claw 283 can be obtained, the operation is
It is simple and advantageous. For example, opening and closing the cover 274
Provide a switch (not shown) that turns on and off with
When the cover 274 is opened to the position shown in FIG.
Turn on the switch of the
Actuating a drive device such as a solenoid or a solenoid, the preliminary switching claw 2
83 from the position of FIG. 30 to the position of FIG. 31, and vice versa
Even when the cover 274 is closed, the operation of the above-mentioned driving device will cause
The equipment switching claw 283 is returned to the position shown in FIG. There is also the following method. Figure 30 and Figure
A cam member 284 is fixed to the cover 274 as shown in FIG.
However, when the cover 274 is closed, the toggle spring 285
By the action, the preliminary switching claw 283 is held at the position shown in FIG.
It When the cover 274 is opened, the cam member 28 integral with the cover 274 is opened.
4 hits the preliminary switching claw 283 to pressurize it, and
Rotate to the position. The preliminary switching claw 283 is the toggle spring 28.
This state is held by 5. Paper discharge roller 281 of paper discharge unit 271
Inside the upper and lower printer units 1 and 2 as shown in FIG.
It can be configured in the same manner as the paper discharge rollers 40 and 45. or,
It is more convenient to do as shown in FIG. Paper output in the figure
The roller 281 includes a driving roller 286 and a driven roller 287.
Drive roller 286 is fixed to its supporting shaft 288.
Driven gear 289 and drive gear 290 meshing with the driven gear 289
It is rotationally driven via. Connecting member 29 on the support shaft 288
1, mounted so as to be rotatable but not axially slidable
I have. A nut 292 is provided at the other end of the connecting member 291.
The nut 292 is rotated by the reversible motor 293.
It is engaged with a feed screw 294 that is rotationally driven. With the motor 293 stopped, raise the transfer paper.
The position of the transfer paper when it is ejected to the partial ejection tray 9 is shown in FIG.
It is assumed that the position is indicated by the chain line. In this state, some rolls
After stacking the copy paper, activate the motor 293 to feed it.
Rotate the screw 294. Then, the nut 292 is fed.
Move in the axial direction of the screw 294 and drive the drive wire accordingly.
La 286 also moves in the same direction, resulting in roller 286.
And the transfer paper sandwiched by 287 is displaced by δ as shown by the broken line.
(Shift). The transfer paper thus shifted by δ is placed on the upper side.
If the paper is ejected to the paper ejection tray 9, the paper is ejected onto the tray 9 before that.
It can be distinguished from the discharged transfer paper group. Tsuma
It is possible to divide multiple transfer papers into several bundles.
It Actually, as shown in FIG.
A sensor 295 is provided on the upstream side of the 281 to shift the transfer paper.
An external signal to be input is input to the main controller described later.
Sensor 295 detects the trailing edge of the transfer paper when
At this time, the motor 293 is operated based on the detection signal,
The drive roller 286 is shifted. [0152] Electrical components In FIG. 24, reference numeral 160 is a power input section, which is an AC plug
It is connected to a commercial power source via 161. Mei in this
Switch 162 and noise filter 163 are included.
It As shown in FIG. 12, the power input section 160 has a lower frame.
It is arranged on the back side of the frame 78. Main switch 162 is down
It penetrates the side wall of the frame 78 and goes out to the outside.
The operator can perform switching operations. Noise fill
The filter 163 removes external noise from the supplied power. One of the power supplied from the power input unit 160 is
Main controller via the interlock switch 164.
Is supplied to the electric power supply unit (main PSU) 165 for electric power, etc.
One is the power supply for the character controller (character
CU PSU) 166. Main PSU165
On the left side of the upper unit frame 47 as shown in FIG.
The noise filter 167 and the constant voltage are arranged.
It has a circuit 168 and a semiconductor relay (SSR) 169.
It The constant voltage circuit 168 mainly performs AC / DC conversion.
The SSR 169 is a heater 38 (FIG. 3) in the heating roller 36.
Turns on / off the power supply for the temperature control. heater
No. 38 shows the thermist for temperature control as can be seen from FIG.
A thermistor 235 is attached, but this thermistor 235
When a minimum width transfer material such as an envelope is applied as the copying material,
It is installed at the upper position corresponding to the transfer path of the minimum width transfer material.
It The reason is that generally envelopes are made by gluing
However, if the fixing temperature is too high, the glue will melt and malfunction.
Occurs. Therefore, set the thermistor 235 to the minimum width of an envelope or the like.
Accurate by placing the transfer material closest to where it will pass
This is because it is possible to perform various heater temperature controls. The interlock switch 164 is shown in FIG.
As shown in the figure, it is installed on the right front side of the lower frame 78 and
It is normally off and turns on when pushed down.
The right end of the lower frame 78 when the printer is assembled
An inner cover 170 made of resin is attached to the. this
Allows the interlock switch 164 to move to the inner cover.
-170 of the switch cover 171. S
A cross-shaped hole 172 is formed in the switch cover 171.
I have. This cross hole does not allow human fingers to enter,
Appropriately shaped press provided on the corresponding part of the unit 1
The child 173 (Fig. 2) is large enough to fit in.
ing. Therefore, as shown in FIG.
Interlock switch 16 when is lifted
4 is turned off and power is not supplied to the main PSU,
When the upper unit 1 is closed,
Turlock switch 164 turns on and power is supplied.
Be done. The cross hole 172 does not allow people's fingers to pass through.
The reason is that when upper unit 1 is open,
-To prevent the lock switch 164 from turning on
It is. When the interlock switch 164 is turned off,
Power supply to the laser optical device 14 is cut off and the laser beam is illuminated.
As described above, the shooting is interrupted. With the inner cover 170 attached,
As shown in FIG. 3, the sheet feeding roller 32 is covered.
I have. As a result, dust or the like adheres to the paper feed roller 32.
Paper feed when the upper unit 1 is lifted
The roller 32 is protected. The character PSU 166 is shown in FIG.
It is arranged on the right rear side of the upper unit frame 47.
As shown in FIG. 24, the noise filter 17
4. A constant voltage circuit 175 is provided. The main PSU 165 is the main controller.
LA 176, charging charger 12, and developing bias power
-Pack (Charging / Development PP) 177, Transfer Charger 3
0 power pack (transfer PP) 178, main motor 9
2. Drive various operating devices 179 and the like. In addition,
Fan 46, suction fan 50, etc., and fixing unit heater 3
Drive eight. Character PSU166 is a character
The controller 180 is driven. (Notification of Transfer Material Size Abnormality) Operator is paper
A paper size can be designated by the size switch 192. this
Designate the size of the transfer material placed on the paper feed tray 3.
This is done by selecting the same as Yo
Normally, the size and paper feed specified by the switch 192
The transfer paper size on Ray 3 is the same. However, the operation
Both sizes are different due to the switch set mistake of the
It is also possible that they will meet. In this case, there will be no compensation whatsoever.
When the lint process is executed, for example, for B5 size
Printing is performed on A4 size paper and the margins become large
Or, on the contrary, the paper size is not enough for the number of prints.
Sometimes In order to solve this, in this embodiment, the print
Process is started and the first transfer sheet is inside the printer
When it is transported to the
Check the size, and detect the size and switch 1
If the size specified by 92 is different,
Is displayed on the operation panel 5 with an LED indication and
Stop operation. This will prevent defective print products.
It can be kept to a minimum. In this case, one sheet once sent to the printer
The transfer paper for the eyes is taken out by the discharge roller 40 or 45 as it is.
Discharged to the department. For this reason, the transfer paper size is detected
You may provide a special sensor for the
An existing sensor such as the sensor 219 may be used. As described above, the abnormality of the transfer paper size is reported.
When it is hit, at the same time, CP of the main controller 176
U186 is the CPU 18 of the character controller 180
Holds the print information that is about to be printed in 4 as is
Instruct them to do so. Otherwise, it will be formed
Printed information is lost due to paper size specification error
Because. (Control of Replacement Instruction of Photoreceptor Unit) FIG.
OP disposed above the suction fan unit 49 of
The C counter 250 includes the photoconductor unit 58 (see FIG.
(A)) Toner recovery tank 57, cleaning blur
Cleaning related parts such as the card 55 (clean
Counting the number of prints for each printing unit. The OPC counter 250 is the main controller.
Count up by the transfer command signal from LA 176
I will do it, but when the count reaches 10,000, a signal to that effect is
Sent to the main controller 176 (Fig. 24)
The controller 176 allows the operation panel 5 to be mounted on the photosensitive member unit.
Exchange display is made. In addition, the OPC counter 250
Toner over sensor 221 before the number reaches 10,000
(Figs. 3 and 24), when toner over is detected,
To the main controller 176, and the same as above
The replacement display of the photoconductor unit is displayed. On the other hand, in FIG. 4A, a new photoconductor
On the upper surface of the case 61 of the photoconductor unit 58 carrying 11
Has a unit identification protrusion 301. this
The protrusion is provided on the bottom surface of the printer upper unit 1 in FIG.
Is detected by the type sensor 302. The photoconductor
When the unit replacement is displayed, the unit identification protrusion 3
If 01 is detected by the type sensor 302,
(That is, when the photoconductor 11 has not been used 10,000 times yet.
If so, "1" is displayed together with the photoconductor unit replacement display.
To be done. Then, the "photoreceptor unit replacement
When the "1""is displayed, the latching solenoid 217
It turns on and pulls down on the plunger, which
The latch sensor 223 is turned on. Latch sensor 22
As long as 3 is on, "Replace photoconductor unit"
The display of "1" continues to be displayed. Latch once turned on
The sensor 223 resets the OPC counter 250.
The reset lever 251 is reset as shown by arrow J.
Are turned off (initial state) at the same time. The display of "photoreceptor unit replacement" 1 "" is
For convenience, it indicates that the photoconductor has been used 10,000 times.
(In some cases, toner may be over before counting 10,000 times.
However, the toner recovery tank 57 (Fig. 3) is a standard print
Toner is filled 10,000 times with waste toner.
Designed to quantity. Therefore, before counting 10,000 times
-"Photoreceptor unit replacement" 1 "" by over detection
Is displayed, the photoconductor was actually used 10,000 times.
Regarded as something). Therefore, the operator who sees this display
Replace the cleaning unit of the photoconductor unit 58.
Replace. The life of the photoconductor 11 is 20,000 times in the embodiment.
Therefore, since it has a life of 10,000 more times, do not replace it.
Yes. Remove the photoconductor 11 from the photoconductor unit 58,
Discard the cleaning unit only. When replacing the cleaning unit
Is a toner recovery tank instead of the old photoconductor unit 58.
Used 10,000 times for a new photoconductor unit 58 where 57 is empty
Install the completed photoconductor 11 and print the photoconductor unit.
The lower unit 2 is mounted at a predetermined position. In addition, new exposure
The case 61 of the body unit has a unit identification protrusion 301.
Those not provided with are selected. Then the operet
Latch pushes the reset lever 251 and the latch sensor 223
Is initialized and the OPC counter is reset at the same time.
It Therefore, after that, the OPC counter starts counting from zero again.
Start und. Reset lever even if the unit is replaced
Latch sensor 223 is initialized unless 251 is pressed.
Therefore, the message "Replace photoconductor unit" 1 "" is displayed continuously.
Continued. In other words, the latch sensor 223 replaces the unit
It prevents the forgetting to reset the OPC counter later. Then, the printing is repeated, and the operation is repeated OP.
C counter counts 10,000 times, or
Is detected, the photoconductor unit replacement display will not appear again.
To be done. However, this time there is no unit identification protrusion 301
Therefore, the type sensor 302 does not detect this.
Therefore, the display at this time is "photoreceptor unit replacement" 2 "".
Is displayed. This display indicates that the unit has been replaced twice
The number of eyes, that is, the photoconductor is 20,000 times or near
It indicates that the photoconductor has been used, and the life of the photoconductor itself has expired.
It is showing that it is coming. Therefore, "photoreceptor unit
The operator replaces the photoconductor 11 with the display of "2" for replacement.
The entire photoconductor unit 58 is replaced with a new one. [0169] Transfer / Elimination cleaner In this embodiment, as shown in FIG.
The chargers 30 are arranged next to each other. Fig. 29
With Lina 252 you can clean both at the same time
It The upper transparent plate 253 of the static elimination lamp 54 is the felt 25.
It is cleaned at 4. Charging of charging charger 30
The wire 205 is made of polyurethane rubber or the like.
It is cleaned with a rinsing cloth 255. Cree
When performing the training, attach the felt 254 to the transparent plate 253.
The polishing cloth 255 to the charge wire 205.
To the cleaner 252 in that state.
The whole is moved in the direction perpendicular to the paper surface. This allows the toner
Other debris is removed. Clip 256
Hook the Lina 252 to an appropriate place in the printer.
It is for the first time. The guide protrusion 257 is a charge wire.
Lower frame 78 (Fig. 3) so as not to push too much 205 etc.
Is to be engaged with the overhanging portion (not shown). According to the present invention, the process unit portion and the heating constant are fixed.
The partition plate placed between the fixing unit and the fixing unit
Prevents warm air from reaching the process unit directly.
In addition, the cooling air inlet is sucked along the partition plate.
Since an exhaust flow path leading to the pulling fan is formed,
Efficient cooling between the process unit and the heat fixing unit.
It will be dampened, and it will be
Preventing defects that adversely affect the process unit
You can

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view of a laser printer which is an embodiment. FIG. 2 is a perspective view showing a state where an upper unit of the laser printer of FIG. 1 is opened. FIG. 3 is a side sectional view of the laser printer of FIG. FIG. 4 is an exploded perspective view of an image forming unit of the laser printer of FIG. FIG. 5 is a plan view of a laser optical device. FIG. 6 is an optical path diagram of a laser optical device. FIG. 7 is a perspective view of a part of the developing unit. FIG. 8 is a diagram showing a meshed state of gears. FIG. 9 is a perspective view of another part of the developing unit. FIG. 10 is a diagram according to arrow X in FIG. 9. FIG. 11 is an exploded perspective view for explaining a sealing unit of a developing roller. FIG. 12 is an exploded perspective view showing a part of a printer lower unit. FIG. 13 is an exploded perspective view showing a part of the printer upper unit. FIG. 14 is a front view of a part of the ozone discharging device. FIG. 15 is a perspective view of a suction fan unit. FIG. 16 is an exploded perspective view of a part of the suction fan unit. FIG. 17 is a perspective view of a paper discharge guide member. FIG. 18 is a front view of a drive system. FIG. 19 is a perspective view of a paper discharge roller. FIG. 20 is a perspective view of a paper discharge ring. FIG. 21 is a perspective view of a sheet discharge path switching unit. FIG. 22 is a perspective view of a part of the positioning unit of the printer upper unit. FIG. 23 is a perspective view of mirror fixing means of the laser optical device. FIG. 24 is a control circuit diagram. FIG. 25 is a side sectional view of a high voltage connection terminal portion. FIG. 26 is a diagram showing an installed state of a transfer charger. FIG. 27 is a cross-sectional view of one means of grounding the upper and lower units. FIG. 28 is a cross-sectional view showing a two-stage rotation structure of the printer upper unit. FIG. 29 is an explanatory diagram of a transfer / static elimination cleaner. FIG. 30 is a side sectional view showing a state in which an optional paper feeding unit is mounted. FIG. 31 is a side sectional view of an optional paper discharge unit. FIG. 32 is a perspective view of an example of a paper discharge roller. FIG. 33 is a perspective view of an example of a support unit for the second cylindrical lens. FIG. 34 is a perspective view of a state in which the tip of the second cylindrical lens is mounted. [Explanation of Codes] 31 Transfer Material 36 Heat Fixing Device (Fixing Roller) 42 Paper Ejection Guide Member 125 Hole

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Nobuhiro Makida             1-3-3 Nakamagome, Ota-ku, Tokyo Stocks             Company Ricoh (72) Inventor Yoshiro Tanaka             1-3-3 Nakamagome, Ota-ku, Tokyo Stocks             Company Ricoh (72) Inventor Takahiro Yanashita             1-3-3 Nakamagome, Ota-ku, Tokyo Stocks             Company Ricoh (72) Inventor Takanori Yamaki             1-3-3 Nakamagome, Ota-ku, Tokyo Stocks             Company Ricoh (72) Inventor Takeshi Motohashi             1-3-3 Nakamagome, Ota-ku, Tokyo Stocks             Company Ricoh (72) Inventor Miyamoto Masayoshi             1-3-3 Nakamagome, Ota-ku, Tokyo Stocks             Company Ricoh (72) Inventor Hisao Ishizu             1-3-3 Nakamagome, Ota-ku, Tokyo Stocks             Company Ricoh (72) Inventor Yasuhiro Sagawa             1-3-3 Nakamagome, Ota-ku, Tokyo Stocks             Company Ricoh (72) Inventor Tadaaki Kanno             1-3-3 Nakamagome, Ota-ku, Tokyo Stocks             Company Ricoh (72) Inventor Tomio Sanoda             1-3-3 Nakamagome, Ota-ku, Tokyo Stocks             Company Ricoh (72) Inventor Hiroshi Hosokawa             1-3-3 Nakamagome, Ota-ku, Tokyo Stocks             Company Ricoh

Claims (1)

Claims (1) A heat exhaust fan, a process unit for image formation, and a heat fixing device are arranged in the main body of the image forming apparatus.
Further, in the image forming apparatus in which the main body of the image forming apparatus is provided with a cooling air inlet, a partition plate is arranged between the process unit and the heating fixing device, and the space between the fixing device and the partition plate adjacent thereto and the process An image forming apparatus, characterized in that an exhaust flow path is formed between the unit and a partition plate adjacent to the unit so as to communicate with the exhaust heat fan from the cooling air introduction port. (2) One of the cooling air introduction ports is a hole provided in a piece located in a lower region between the process unit and the heat fixing device. Image forming device.