JP2586839B2 - Electrostatic printing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic printing apparatus having a copy mode and a print mode.

[0002]

2. Description of the Related Art An electrostatic printing apparatus having a printing function in a conventional electrophotographic copying machine employing an electrophotographic method is disclosed in, for example,
No. 41655 is known. In the printing apparatus, a master is formed by fixing a toner image on a photoconductive plate by an electrophotographic method, and electrostatic printing is performed using the master.

However, in the above-mentioned conventional electrostatic printing apparatus, there are disadvantages such as the printing speed cannot be increased much and the working efficiency is not good because the preparation of the master and the printing process in the printing mode are complicated. In order to solve such a problem, for example, in Japanese Patent Application Laid-Open No. 58-55946, a print master is created when a large number of prints are desired, and a print master is created when a small number of copies are desired. There has been proposed an electrostatic printing copying method in which a copy is made without using a developing device and the photoreceptor is cleaned by a developing device in the next rotation.

In the above electrostatic printing copying method, there is provided a rotating drum in which a photoconductive sheet wound in a roll is accommodated, and the light is transmitted through a slit formed on the outer peripheral surface of the rotating drum. The conductive sheet is configured to be extended along the outer peripheral surface.

[0005]

However, in the method using a rotating drum having a slit on the outer peripheral surface as in the electrostatic printing copying method disclosed in the above publication, when developing or cleaning the photoconductive sheet, the light There is a problem that the developer detached from the conductive sheet enters the rotary drum through the slit, adheres to the unused photoconductive sheet in the rotary drum, and stains the unused photoconductive sheet. The present invention has been made in order to solve such a problem. Even if developer enters the scroll drum through a slit formed on the outer peripheral surface of the scroll drum, the developer can be discharged during rotation of the scroll drum. An object of the present invention is to provide an electroprinting apparatus to prevent an unused photoconductor in a scroll drum from being stained by a developer.

[0006]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
According to the first aspect of the present invention, an elongated slit is formed in the axial direction.
Drum body and the drum body
Drum main body through the slit
Feeding means for feeding along the outer peripheral surface of the
The photosensitive member is fed out by the feeding means.
The scroll drum is rotated to form the photosensitive drum.
Electrostatic latent image developed with a developer
Te, the slit before to prevent ingress of developer
With the photoconductor extended, remove the gap between the slits.
Provide an elongated mask plate in the axial direction of
Rotation of the scroll drum inside one mask plate
The first inclined surface on the front side with respect to the direction of
On the rear side, the inclination angle larger than the inclination angle of the first inclined surface.
The ridge line consisting of the second inclined surface is formed.
And In order to achieve the above object, the invention according to claim 2 is provided.
Akira corresponds the outer surface of the mask plate to the outer surface
And the outer surface of the scroll drum
Have a notch along the axis on the front side in the direction of rotation of
It is characterized by. Claim 3 further achieves the above object.
The invention described in the above is characterized in that the feeding means is the scroll drum
Feeding around the sheet-shaped photoreceptor provided inside
Roll and a pair along each side parallel to the axis of the slit
A sheet-shaped photosensitive member provided from the delivery roll
A first roll and a second
And the sheet-shaped photoconductor from the first roll is folded inside
A second roll, and a sheet-like photosensitive from the second roll
And a take-up roll for winding the body inside.
Outer surface between the first and second rolls of the drum body
The mask plate is slightly immersed from the outer peripheral surface of the mask plate.
Is provided.

[0007]

[Operation] According to the above configuration, the invention according to claim 1 is provided.
For example, developing the electrostatic latent image formed on the surface of the photoreceptor,
Removed from photoconductor when cleaning photoconductor surface
Toner enters the scroll drum through the slit
Also move rearward due to the inertia associated with the rotation of the scroll drum.
Moving, the size of the tilt angle formed on the back side of the mask plate
Because it is discharged outside the scroll drum due to the inclined surface,
Stays in the scroll drum and stays in the scroll drum
Prevents contamination of unused photoconductors
can do. According to the second aspect of the present invention,
The outer peripheral surface of the mask plate and the outer peripheral surface of the scroll drum
Whether it has a notch at the tip part in the corresponding shape
The tip of the developer that has spiked on the surface of the developing roll during development
Never be cut. Further, according to the third aspect of the present invention,
If the outer peripheral surface of the mask plate is outside the scroll drum
Since it is slightly immersed from the peripheral surface, the mask
The amount of the developer adhering to the outer peripheral surface of the sheet can be reduced.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, reference numeral 1 denotes a main body of the electrostatic printing apparatus, on which a platen glass 3 on which a document 2 to be copied or printed is placed is provided. The platen glass 3 is composed of the main body 1
A platen cover 6 is attached to the upper surface of the top cover 4 provided so as to cover the upper part of the camera, and is hinged to the top cover 4 side via a hinge 5 on the platen glass 3 so as to be openable and closable. ing. One end of the top cover 4 is pivotally attached to the main body 1 by a support shaft 7,
A light source 8 for exposing and scanning the original 2 placed on the platen glass 3 is provided on the back side of the top cover 4 at the other end thereof.
And an optical system 9 for guiding the reflected light from the document 2 to a photoreceptor 37 described later.

The light source 8 is, for example, a tubular halogen lamp. The light source 8 is mounted on a carriage 11 together with a reflector 10 that reflects light emitted from the light source 8 toward the original 2.
Exposure scanning is performed on the copy surface of the original 2 with the movement of the carriage 11, and reflected light from the original 2 is reflected by first to third mirrors 12, 13, 13, and 13 mounted on the carriage 11.
The guide 14 is guided to the lens carriage 15 side. The lens carriage 15 has a guide rail 16 laid below and parallel to the platen glass 3.
The lens carriage 15 is provided with a condensing lens 17.

[0010] A mirror carriage 18 is provided behind the lens 17 and supported by a guide rail 16. The mirror carriage 18 is provided with a fourth mirror 19, which guides the reflected light from the document 2 condensed by the lens 17 to the photoconductor 37 via the dustproof glass 20.

On the other hand, the carriage 1 on which the light source 8 is mounted
1 and the lens carriage 15 and the mirror carriage 18 are driven by the drive system 21 as follows. That is, the drive system 21 has drive sources 22 and 23 composed of two DC servomotors, and the drive sources 22 and 23 drive the carriages 11, 15 and 18 via power transmission means 24 such as a wire. Is to be driven.

When the top cover 4 is opened in the vicinity of a drive gear 26 provided on a drive shaft 25 located above the support shaft 7 due to paper jam or inspection, due to its own weight, the carriages 11, 15,. A stopper mechanism 27 is provided to prevent the drop 18 from dropping. As shown in FIG. 7, the stopper mechanism 27 has a structure in which an elastic body 27b such as a sponge is provided at the tip of a substantially O-shaped plate 27a fixed to the main body 1 side. When the top cover 4 is opened upward about the support shaft 7 as shown in FIG. 8, the drive gear 26 provided on the top cover 4 side is opened together with the opening of the top cover 4 as shown in FIG. As shown, the elastic body 27 of the stopper mechanism 27
b, the idling of the drive gear 26 is prevented, thereby restricting the movement of the drive system 21. Even when the top cover 4 is opened, each carriage 11,
The light source 8 and the optical system 9 are prevented from being damaged by the falling of the light sources 15 and 18.

On the other hand, a cooling fan 30 is installed on the pivotal side of the top cover 4. The cooling fan 30 includes:
The cooling air blown by the cooling fan 30 is sent to the light source 8 along the lower surface of the platen glass 3 as shown in FIG. Above the light source 8, a lamp cover 31 is provided which is gradually inclined toward the downstream side so as to guide cooling air as a laminar flow to a gap between the light source 8 and the platen glass 3. By cooling the platen glass 3 together with the light source 8 at the same time, the light source 8 and the platen glass 3 can be effectively cooled with a smaller air volume, and the power consumption of the cooling fan 30 is reduced.

The cooling air that has cooled the light source 8 travels along the lower surface of the top cover 4 to a fixing device 160 described later, and after cooling the fixing device 160, as shown in FIG. The heat is emitted from the light source 8 and the fixing device 160 to the outside of the main body 1 through the slit 4a formed in the main body 1 to prevent the temperature inside the main body 1 from rising.

On the other hand, in the figure, reference numeral 35 denotes a photosensitive unit,
It is installed on a guide rail 36 laid in the front-rear direction, and can be pulled out when the photoconductor 37 is replaced or when the developer is supplied. The photoconductor unit 35
Has a scroll drum 39 which is rotated forward and backward by the main motor 38 at a speed of, for example, three steps in the forward direction and one step in the reverse direction. A slit 39a is opened in the axial direction in the outer peripheral portion of the scroll drum 39, and the photosensitive member 37 accommodated in the scroll drum 39 is fed out from the slit 39a. The photoreceptor 37 is formed by winding a sheet-like material such as paper into a roll shape, and a feed shaft 40 accommodated in a scroll drum 39.
Is set to

The slit 39a of the scroll drum 39 is provided with a mask plate 41 for preventing toner from entering the scroll drum 39 during rotation. As shown in FIG. 10B, the mask plate 41 has an outer peripheral surface 41a having the same curvature as the scroll drum 39, and the outer peripheral surface 41a is slightly immersed in the outer peripheral surface of the scroll drum 39. Installed. On the inner surface side, inclined surfaces 41 having different angles are provided.
b, 41c are formed. Outer peripheral surface 41 continuing to inclined surface 41b located in the normal rotation direction of scroll drum 39
a is provided with a notch 41d to prevent the developer from entering the scroll drum 39 when the mask plate 41 passes through a developing device 55 to be described later, and to form inclined surfaces 41b and 41c. Is formed at a steep angle, and even if a part of the temporary developer enters the scroll drum 39, the developer can be discharged out of the school drum 39 by dropping the developer along the inclined surface 41c. It has become.

One end of the roll-shaped photoreceptor 37 set on the feeding shaft 40 has a slit 39a of the scroll drum 39 and a narrow space between the mask plate 41 provided to close the slit 39a. Has been extended to. The photoreceptor 37 extended to the outside of the scroll drum 39 substantially goes around the outer peripheral surface of the scroll drum 39 to reach the slit 39a, and the slit between the slit 39a provided on the opposite side of the slit and the mask plate 41 is formed. It is taken into the scroll drum 39 again, and is taken up by a take-up shaft 42 arranged in parallel with the pay-out shaft 40.

On the other hand, the following components are provided around the scroll drum 39 along the normal rotation direction of the scroll drum 39. In the figure, reference numeral 45 denotes a charger installed substantially above the scroll drum 39, and has a shield case 45a having an opening on the scroll drum 39 side as shown in FIG. The inside of the shield case 45a is 2
The three partitions 45 ₁ , 4 ₁ in the longitudinal direction
5 _2, 45 ₃ are sectioning, the chamber 45 ₁ is the neutralizing chamber, and the chamber 45 _2, 45 ₃ has a charging chamber. Static elimination room 45 ₁
Inside, there is provided a static elimination wire 46 stretched between insulating blocks 45d provided at the end of the shield case 45a. The discharge of the static elimination wire 46 enables the photosensitive member 37 to be neutralized. I have.

[0019] The charging chamber 45 _2, 45 _3, the charging wire 4 is stretched into a U-shape between the insulating block 45d
7 are accommodated, and both ends of the charging wire 47 are arranged so that the charging wire 47 can be easily stretched as shown in FIG.
As shown in FIG. 2, a bracket 48a is attached to one end of the plug 48.
Mounted through. One end of the plug 48 is screwed to the end plate 45e of the insulating block 45d. By rotating the other end of the plug 48, the bracket 48a can move in the direction in which the charging wire 47 is stretched. I have. Thus, by attaching both ends of the charging wire 47 to the bracket 48a and then rotating the plug 48, the charging wire 47 can be easily stretched with a predetermined tension.

Further the partition wall 45b for sectioning between neutralization chamber 45 ₁ and the charging chamber 45 ₂ is being formed higher than the partition wall 45c for sectioning between the charging chamber 45 _2, 45 _3, the static eliminator wire 46 and the charging wire 47 together thereby preventing electrical interference, the substantially central portion of the housing 45a sidewalls of the partition 45 and the charging chamber 45 ₃ side is attached ion control plate 49 such as a resin plate for controlling the flow of ions generated during discharge I have. The ion control plate 49 on the side wall is higher than the opening edge of the side wall, and restricts outflow of the ion flow (see the arrow in FIG. 11).
In this way, a countermeasure is taken so that the charging of the photoconductor 37 becomes uniform.

On the other hand, reference numeral 50 in FIG.
The image area adjusting lamp for erasing unnecessary portions of the electrostatic latent image formed on the surface of the non-image portion, that is, the non-image portions on the front end, the rear end, and both sides, is configured as follows. That is, the photoconductor 3
The lamp case 50a has a slit opening on the side 7. The inner lamp case 50a is sectioning the plurality of lamp chambers 50 _1, 50 ₂ ... 50n by a partition 50b provided for each size of the document 2, as shown in FIG. 13, each of the lamp chamber 50 ₁ ～50N A miniature bulb-shaped tungsten lamp 50c is accommodated, and each tungsten lamp 50c is selectively turned on and off according to the size of the original, so that the electric charge charged to the non-image portion on the photoconductor 37 is erased. ing.

At the lower edge of the slit-shaped opening 50d of the lamp case 50a, a light-shielding plate 50e formed of a black mylar plate or the like is attached obliquely along the surface of the photoreceptor 37, and a part of light is emitted. Leakage to the uniform exposure / discharge lamp 51 side is prevented. The uniform exposure and static elimination lamp 51 is provided below the image area adjustment lamp 50 and is configured as follows. That is, it has a lamp case 51a as shown in FIG. 14 to FIG. 16 in which the photosensitive member 37 side is opened, and prevents the developer or the like from entering the inside of the opening 51b to stain the lamp 51c or the like. A transparent stain prevention plate 51d is fitted. A large number of lamps 51c are connected in series in the lamp case 51a, and the lamps 51c are arranged in a staggered arrangement.
A group of lamps arranged in a row are accommodated, and by uniformly exposing the master image formed on the surface of the photoconductor in the printing mode, an electrostatic latent image for printing is formed on the master image. There is also a function of facilitating cleaning by turning on the light during cleaning and uniformly exposing the surface of the photoconductor 37.

On the other hand, reference numeral 52 in the figure denotes a flash fixing device provided below the uniform exposure and static elimination lamp 51. A flash lamp 52b is accommodated in a reflector 52a having an opening on the photosensitive member 37 side. This flash lamp 52
b flashes in synchronization with the rotation of the photoreceptor 37 in the print mode, and has a function of fixing the toner image formed on the photoreceptor 37 by a predetermined width and forming a printing master on the photoreceptor 37. doing.

In the figure, reference numeral 55 denotes a developing unit provided below the scroll drum 39, a developing unit 55b having a housing 55a having an open upper surface, and a toner supply unit 5
6. The developing unit 55b has guide rails 55e laid on both lower sides thereof, and these guide rails 55e are placed on guide rolls 53 provided on the main body 1 side.
Can be pulled out to the near side. At the opening of the housing 55a, two parallel developing rolls 55c and 55d are provided horizontally adjacent to the photoreceptor 37. As shown in FIG. 17, the outer peripheral portions of the developing rolls 55c and 55d are magnetized with five poles on the developing roll 55c side and three poles on the developing roll 55d side, and are rotated in the same direction as the scroll drum 39 during development. The electrostatic latent image of the photoconductor 37 wound around the outer peripheral surface of the scroll drum 39 is developed by a magnetic brush formed on the outer peripheral surface of the scroll drum 39. A stirring roll 54 for supplying the developer to the developing rolls 55c and 55d and for stirring the developer in the housing is provided. As shown in FIG. 2 and FIG. 18, the stirring roll 54 has a number of buckets 54a provided on the outer peripheral portion at equal intervals in the circumferential direction.
4a, the developer at the bottom of the housing 55a is scooped up and supplied to the developing rolls 55c and 55d, and a plurality of stirring blades 54b are provided inside the stirring roll 54 at a predetermined angle with respect to the axis. The developer that has entered the stirring roll 56 through the gap 54c between the buckets 54a is stirred by the stirring blades 54b, so that the toner and the carrier are always mixed at a constant ratio.

The developer supplied to the developing roller 55d by the agitating roller 54 is scraped off by the spike regulating plate 57 installed near the developing roller 55d, and is formed on the outer peripheral surface of the developing roller 55d. The spike height of the magnetic brush is regulated so as to be constant.
As shown in FIG. 19, a part of the developer scraped by 7 flows into a developer concentration detector 58 installed below the spike regulating plate 57 as shown in FIG. As shown in FIG. 20, the developer concentration detector 58 has a hopper 58a having a wide open upper surface, and a sensor 58b embedded in a side surface of the hopper 58a for detecting the toner concentration of the developer passing through the hopper 58a. Have been.

On the other hand, the developer after the development of the photoreceptor 37 is scraped off from the outer peripheral surface of the developing roll 55c by a scraping blade 59 provided so as to be in contact with the developing roll 55c. The mixing is performed by the cross mixer 60 provided below the scraping plate 59 as follows. That is, as shown in FIGS. 21 and 22, the cross mixer 60 has box-like passages 60b and 60c formed on both surfaces of the scraping blade 59 by the side plates 60a. In the passages 60b and 60c, the developer falling from above the passages 60b and 60c is caused to flow in the left-right direction as indicated by solid arrows and dotted arrows shown in FIG. 22 (note that the dotted arrows indicate flows on the back side). Guide plates 60d, 60e to change to
Are provided in an oblique direction, and these guide plates 60d,
The developer that is guided by 60e and falls from below the cross mixer 60 is mixed using the drop force, and the toner supplied from the toner supply unit 56 is mixed below the cross mixer 60 with the developer. An auger 61 is provided for mixing the developer dropped from the cross mixer 60 with the developer in the housing 55a. The auger 61 is
As shown in FIG. 23, fins 61a whose winding directions are reversed in the left-right direction from the center are provided spirally, and the developer dropped to the center side of the housing 55a by the cross mixer 60 rotates the housing 55a. By transporting the developer 55a to the outside, the stirring performance of the developer is improved, and the developer can be efficiently mixed.

On the other hand, the toner supply section 56 has a toner housing 56a pivotally attached to the side of the developing unit 55b by a bottom pin 65. An upper portion of the toner housing 56a is provided with a cylindrical cartridge guide 56b.
The cylindrical toner cartridge 62 can be inserted and removed from the end of the cartridge guide 56b. The toner cartridge 62 contains toner therein, and a seal (not shown) that closes an opening at the time of toner replenishment is peeled off, and the opening is positioned above one end of the cartridge guide 56b. By inserting the toner cartridge 62 and rotating the toner cartridge 62 by approximately 180 ° after the insertion, the toner stored in the toner cartridge 62 can be removed from the lower opening 5 of the cartridge guide 56b.
6c, the toner is dropped into the toner housing 56a and supplied.

An agitator 63 is provided below the cartridge guide 56b, and a toner housing 56a is provided.
The supply roll 64 is provided in the lower opening 56d. The agitator 63 is formed of a wire as shown in FIG. 26, and rotates in a clockwise direction at a speed of about 7.3 rpm to thereby rotate the toner cartridge 6.
The toner is agitated so that the toner supplied from 2 reaches the supply roll 64 without causing a blocking phenomenon. On one end side of the agitator 63, a wiping body 66 made of a thin mylar plate is attached by a clip 67 '. The wiping body 66 rotates together with the agitator 63, and rotates the toner detector 6 provided at the bottom of the toner housing 56a.
The toner attached to the detection surface 7 is wiped off, so that the toner detector 67 can reliably detect the presence or absence of toner in the toner housing 56a.

On the other hand, the lower opening 5 of the toner housing 56a
The entire supply roll 64 provided in 6d is made of a foam such as a polyurethane resin, and a part of the toner enters a large number of holes provided on the surface. The opening 56d is provided on the outer peripheral portion of the supply roll 64.
The protrusion ridge 56e having a substantially semicircular cross section provided at the opening edge of the toner cartridge enters the hole of the outer peripheral surface with the rotation of the supply roll 64, and is squeezed out. 55a. As a result, 0.5 g of toner per second can be supplied into the housing 55 a at a rotation speed of 4 rpm, and the supply capacity decreases during use for a long period of time, and the supply roll 64 is worn. In this case, the supply roll 64 can be easily cleaned or replaced by rotating the toner housing 56a about the pin 65 to the position shown by the imaginary line in FIG.

On the other hand, the developing unit 55b of the developer 55
Has already been described so that the developing unit 55b can be pulled out to the near side of the main body 1 along the guide rail. However, when the developing unit 55b is mounted, It needs to be fixed in a relationship. This is done by the next positioning pin 70. A total of four positioning pins 70 are provided, two at the rear of the body 1 and two at the front. As shown in FIG. 29, each positioning pin 70 has its base end fixed to the bracket 1a of the main body 1 with its conical tip directed in the direction in which the developing unit 55b is pulled out. The developing unit 55b
The front and rear brackets 55g are provided with pin holes 55h at positions where the positioning pins 70 can be inserted. When the developing unit 55b is pushed in, the pin holes 55h of these brackets 55g are fitted into the positioning pins 70, and At the same time as the positioning of the developing unit 55b is performed, the latch unit 71 locks the developing unit 55b to prevent the developing unit 55b from coming out. When the developing unit 55b is positioned by the positioning pins 70, the developing unit 55b is held in a state of being floated from the guide rail 36.

In the developing device 55, the developer can be replaced as follows. FIG. 30 shows a developer supply unit 75, which has a semi-cylindrical cartridge housing part 75a having an upper surface opened at the upper part. A dropout 75b is opened in the bottom surface of the cartridge accommodating portion 75a, and a skirt portion 75c is formed in a lower portion of the replenishing unit 75. Both ends of the skirt portion 75c are used to clean the photosensitive member unit 35. Can be mounted on a guide rail 36 that guides the vehicle.

A handle 75d for facilitating handling is provided on the side surface of the replenishing unit 75, and a developer falling from the drop port 75b is provided below the drop port 75b below the drop port 75b. Each of the chutes 75e is provided for guiding the chutes. In replacing the developer, first, the front cover (not shown) of the main body 1 is opened to take out the photoconductor unit 35 to the near side, and then the skirt portion 75c of the developer supply unit 75 is connected to the photoconductor unit. 3
5 to the front side, and then the developer supply unit 75
Is mounted on the guide rail 36 for guiding the photosensitive unit 35 in and out, and the guide rail 3
6. Push in along the line 6 to a predetermined position. At this time, the opened developer cartridge 76 is previously loaded in the cartridge accommodating portion 75a of the supply unit 75. Then the main body 1
Is closed, and a developer exchange switch 77 provided on the outer surface of the main body 1 is pressed.
a is approximately 180 °
The developer in the developer cartridge 76 is rotated, and the developer in the developer cartridge 76 is guided to the chute 75e from the drop port 75b, and the developing roll 5 is rotated.
5d, and is supplied into the housing 55a.

When the developer in the housing 55a is replaced, the empty developer cartridge 76 is set in advance on a catch pan 78 shown in FIG. 27 installed below the developing unit 55b. Developing unit 5
The developer discharge gate 55f shown in FIG. 24 provided at the bottom of the base 5b is opened, and in this state, the developer exchange switch 77 provided on the outer surface of the main body 1 is pressed. As a result, the developing rolls 55c and 55d and the stirring roll 56 rotate, and the developer in the housing 55a is discharged from the developer discharge gate 55f into the developer cartridge 76 on the catch pan 78, and the developer is newly added. When replenishing, the above-mentioned replenishment operation may be performed.

On the other hand, reference numeral 80 in the figure denotes a paper feeder, which is provided with a plurality of, for example, two-stage paper cassettes 81. These paper cassettes 81 are removably mounted in a cassette receiving stand 83 that can be pulled out toward the front side of the main body 1 along the guide rails 82. As shown in FIG. 35, two cassette fixing pins 83a project from the bottom of the cassette receiving base 83, and the cassette fixing pins 83a allow the paper cassette 81 to be moved relative to the cassette receiving base 83. Positioning and fixing are performed.

At the bottom of the cassette receiving base 83 on the paper feed side, a base end is fixed to a rotating shaft 86 provided in a direction perpendicular to the paper feeding direction of the paper 85. Is provided with a tongue 87 whose tip end is rotatable in the vertical direction. One end of the rotation shaft 86 is connected to the cassette support 8.
3, and one end of a lever 86a is fixed to the tip. A tension spring 88 is provided at the other end of the lever 86a.
Is locked, and the other end of the tension spring 88 is locked to a distal end of a rotary lever 89 whose base end is pivotally attached to the bottom of the cassette receiving base 83. Rotating lever 89
When the cassette receiving stand 83 is pushed into the main body 1 along the guide rail 82, the distal end comes into contact with a wedge-shaped cam 90 provided on the main body 1 side. Is turned in the tensioning direction of the tension spring 88. When the tension spring 88 is tightened, the rotation shaft 86 is rotated by the tension via the lever 86a, whereby the tip of the tongue 87 is rotated upward,
Push up the bottom of the paper cassette 81,
The paper 85 accommodated therein is pressed from below onto a feed roll 91 provided on the paper supply side.

Further, the cassette receiving base 83 pushed into the main body 1 is fixed to the main body 1 by engaging a stud pin 93 provided on the cassette receiving base 83 with a stopper 92 provided on the main body 1 side. At the same time, the cassette receiving base 83 is fixed, and at the same time, the projection 81a for detecting the paper size provided on the paper cassette 81 side acts on the paper size detection switch 94, whereby the size of the paper 85 set in the paper cassette 81 is changed. Is detected.

The driving system of the paper feeding device 80 and the conveyance of the paper 85 are as follows. Cassette receiver 83 into main body 1
Is pressed, the joint 95a on the cassette receiving base 83 side engages with the joint 95b on the main body 1, and the drive system 96 of the main body 1 is connected to the drive shaft 97 of the field roll 91 via the clutch 97 and the joints 95b, 95a. Has been communicated. A support member 91a of the feed roll 91 is supported on the drive shaft 97 so as to be movable in the axial direction. The support member 91a
36 and 37, a feed roller 91 is rotatably supported as shown in FIGS. 36 and 37, and the power transmitted to the drive shaft 97 is transmitted by a gear 98 and a one-way clutch 99.
Is transmitted to the feed roll 91 through the feed roller 91, and the feed roll 91 is rotated.
A sliding member 100 is mounted movably in the axial direction. The sliding member 100 is provided with a paper backing member 100b having a claw body 100a, which is inserted into a not-shown square hole provided in the support member 91a of the feed roll 91, thereby supporting the supporting member 91a. The vertical movement of the member 91a is regulated, and the member 91a is linked with the guide 81b provided with the projection 81a for detecting the paper size. When the guide 81b is moved according to the paper size, the support member for the feed roll 91 is supported. The paper 91 is also moved so that the paper is fed at a fixed position from the edge of the paper even if the size of the paper 85 changes variously.

A one-way clutch 99 is incorporated in the feed roll 91. When the conveyance of the paper 85 is started by the conveyance roll 113, which will be described later, the one-way clutch 99 causes the feed roll 91 to run idle and convey the paper. Of the support member 91a for supporting the feed roll 91, the support-side end is formed in an arc shape.
12 and the paper 8 carried out by the feed roll 91
5 is prevented from being skewed.

On the other hand, a drive shaft 101 provided on the rear end side of the cassette receiving base 83 is connected to a cassette elevating motor 102 via a joint 101a, and the motor 102 moves the paper cassette 81 horizontally through a cable 103. It is raised while maintaining the state. A screw 104 whose height can be adjusted is provided at the bottom of the cassette receiving base 83.
5 (see FIG. 32 (b)), the micro switch 106 attached to the cassette holder 83 is turned off.
Is stopped, and this position becomes the conveyance position of the paper 85. In the drawing, reference numeral 107 denotes a stopper pin which is inserted into a square hole (not shown) provided for each sheet size according to the sheet size to prevent the set sheet 85 from shifting.

Reference numeral 108 denotes a sheet 8 in the sheet cassette 81.
Reference numeral 109 denotes a detector for detecting the presence or absence of the reference numeral 5 and a detector 109 for detecting whether the paper 85 is set to be fed horizontally or vertically.

On the other hand, a paper transport mechanism 110 is provided between the feed roll 91 and the photosensitive unit 35. The paper transport mechanism 110 guides the paper 85 fed from the upper paper cassette 81 and the paper 85 fed from the lower paper cassette 81 as shown in FIG. It has a paper guide plate 112, and a transport roll 113 is provided at a junction of the guide plates 111 and 112. A plurality of portions of the rotating shaft 113a of the transport roll 113 are urged upward by urging means 121 such as a leaf spring, and are uniformly pressed against a pinch roll 114 provided above. The pinch roll 114 is rotatably supported in the vicinity of a bent portion of a support link 115 in which both ends of a rotation shaft 114a are substantially inverted. One end of the support link 115
The support link 115 is pivotally connected to an upper guide plate 116 provided at the rear side of the link 118 via a pin 117, and the other end of the support link 115 is pivotally connected to a lower end of the link 118. Link 1 above
At the lower end of the paper guide plate 1 via a small link 119
11 is also connected, and the upper end of the link 118 is connected to a vacuum suction / conveyance means 145, which will be described later.
, The pinch roll 114 and the paper guide plate 111 are lifted to remove the paper 85 having a paper jam on the transport path. In addition, the transport roll 11
3, the conveying path 1 is provided by upper and lower guide plates 121 and 122.
23 are formed.

The transport path 123 forms a loop in the paper 85 until the registration roll 124 provided on the downstream side starts rotating, and a substantially triangular space is vertically guided so that the paper 85 is on standby. Plates 121, 122
And an auxiliary guide plate 125 protrudes from the lower guide plate 122. The auxiliary guide plate 125
Is a trigger for forming a loop in the paper 85, has a substantially mountain shape, has one end pivotally connected to the transport roll 113, and projects into the transport path 123 by a biasing means 126 such as a spring. (See FIG. 40). When the transported paper 85 is thick, it is immersed downward by the waist of the paper 85 as shown in FIG. 41, so that a large loop is formed in the paper 85.

On the other hand, the registration roll 124 provided downstream of the transport path 123
As shown in FIG. 9, the photosensitive member 37 is urged by urging means 127 such as a plurality of leaf springs, is uniformly pressed against the pinch roll 128, starts rotating in response to a sheet feed signal, and sequentially starts from the leading end of the sheet 85. As shown in FIG. 44, one side of the paper 85 fed to the photoconductor 37 side rides on the peeling belt 131 provided in the paper peeling means 130 as shown in FIG. Has become. The peeling belt 131 is formed of a thin metal plate such as stainless steel, and the upper end is fixed to the main body 1 by a bracket 132.

The intermediate portion of the peeling belt 131 is the photosensitive member 3
7, a tongue 131a which is curved upward in the opposite direction to the above-mentioned curve is formed slightly above the intermediate portion, and the leading end of the paper 85 reaching the tongue 131a. Is guided by the tongue piece 131a and is sequentially peeled from the surface of the photoreceptor 37. And the above-mentioned peeling belt 1
Numeral 31 is separated from the photoconductor 37 when the photoconductor unit 31 is moved in and out as follows. That is, the lower end side of the peeling bracket 131 is held by a bracket member 135 in which a bracket portion 135a is pivotally supported by a pin 136 as shown in FIG. The guide member 135
Is normally biased by a biasing means 137 such as a tension spring to a position where the leading end of the paper 85 is guided between the photosensitive member 37 and the transfer device 140. At this time, the peeling belt 131 is biased by the biasing means 137. It is pressed against the photoconductor 37.

A fourth member is provided below the guide member 135.
As shown in FIG. 7, an arm 139 whose one end is pivotally supported by a pin 138 is provided, and a cam 139a is attached to the tip of the arm 139. When the photoconductor unit 31 is pulled out, the cam 139a is Guide rail 3
6, the arm 139 turns upward, and the guide member 13
5 is pushed up, the peeling belt 131 whose lower end is engaged with the guide member 135 is separated from the photosensitive member 37, and the photosensitive member 37 is damaged by the peeling belt 131 when the photosensitive unit 31 is moved in and out. To prevent it.

On the other hand, in the transfer unit 140, as shown in FIG. 48, insulating blocks 140b are provided at both ends of a shield case 140a in which the photosensitive member 37 is opened.
Two corotron wires 140c are stretched between these insulating blocks 140b. Shield case 140a
A guide 140d for preventing the leading end of the paper 85 from entering the opening is provided diagonally for each paper size, and a planar suction tape 141 is attached to the side surface of the shield case 140a. Planar suction tape 14
1 allows easy attachment and detachment to a predetermined position.

The paper 85 having been transferred by the transfer unit 140 is separated from the photoreceptor 37 by the separation belt 131 and is conveyed to the fixing device 160 by the vacuum suction conveyance unit 145. As shown in FIG. 43, the vacuum suction transfer means 145 has a drive shaft 146 supported by the frame 1b on the main body 1 side.
Power is transmitted through the power transmission shaft 148 and the turn roll 149. The drive shaft 146
A plurality of rolls 146a are provided at intervals, and an endless transport belt 151 is provided between these rolls 146a and rolls 150a of a roll shaft 150 provided in parallel with the drive shaft 146. , 15
It is wound every 0a. The above-mentioned turn roll 149
Above is provided a turn belt 151. The turn belt 151 is wound around three pulleys 153 disposed so as to be located at the vertices of a triangle, and is formed on the outer peripheral surface of the turn roll 149 by the action of a torsion spring 154 for urging the arm 152. The pressure-contacting sheet 85 has the function of sending out the leading end of the paper 85 peeled off by the peeling belt 131 in the direction of the transport belt 151, and the pulley 1.
One of the members 53 is supported by the arm 152, and when a paper jam occurs, the pulley 153 is swung together with the arm 152 to loosen the turn belt 152, so that the paper 85 having the paper jam can be easily removed. You can do it. The tip of the arm 152 is a bracket 155.
The pulley 153 provided on the arm 152 is positioned by being locked by a locking piece 155a formed by cutting and raising the arm.

On the other hand, in the turn loan 149, the 43rd
As shown in the drawing, a concave groove 149a is provided, and a pin 146 provided on the drive shaft 146 side is provided in the concave groove 149a.
b is inserted and the power transmission shaft 1 is inserted through the pin 146b.
By transmitting power to the drive shaft 146 from the 48 side, it is not necessary to separately provide a joint, and at the same time, the vacuum suction transfer means 145 is easily installed.

A suction duct 155 is provided below the transfer surface of the transfer belt 151. On the upper surface of the suction duct 155, a number of suction holes 155a are opened between the conveyor belts 151, and these suction holes 155a
By pressing the paper 85 onto the paper 85 transport belt 151 by suctioning the paper 85,
5a has an opening on the inner side from the outer side and more on the side of the fixing device 160 to improve the conveying force and to prevent the leading end of the sheet from curling at the fixing device 160 side.
The suction hole 155a itself has a conical shape to improve the suction force. Then, the above-mentioned vacuum suction transfer means 145
Is rotatable upward about a drive shaft 146. At this time, the paper guide plate 111 and the like connected via a link 118 are simultaneously opened upward, and the vacuum suction / transportation means 145 and the main body 1 are opened. By the plate stay 156 provided between the side and the side, as shown in FIG. 51, the plate stay is held at the open position.

On the other hand, the fixing device 160 includes a fixing roll 161 having a built-in heat source 163 and a pressure roll 162 for pressing a sheet 85 to be fixed to the fixing roll 161.
At the entrance side of these rolls 161 and 162, a carry-in chute 164 for guiding the paper 85 is provided so as to be inclined gradually higher, and a release agent is applied to the surface of the fixing roll 161 above the carry-in chute 164. A metering blade 165 is provided.

A paper peeling mechanism 170 for peeling the paper 85 from the fixing roll 161 is provided behind the fixing roll 161.
Is provided. As shown in FIG. 54, the paper peeling mechanism 170 has a peeling claw 171 whose leading end contacts the surface of the fixing roll 161. The peeling claw 171 is the support shaft 1
It is attached to the lower part of the support of the carry-out chute 173 that can rotate upward about the center 72. One end of a pair of links 174, which are flexibly connected to the paper peeling claw 171 by a shaft 173a, is connected by pins 175, and the other end of the link 174 is connected to the unloading chute 173, and is unloaded. When the chute 173 is opened from the sheet peeling position to the position indicated by the imaginary line in FIG. 54, the tip of the sheet peeling claw 171 is located at a position facing the shaft 173a, and the user is not injured by the tip of the sheet peeling claw 171. It has become. The paper 85 peeled off from the fixing roll 161 by the paper peeling claw 171 is discharged to the discharge tray 176 by the unloading roll 175. The unloading roll 17
5 is a relatively wide drive roll 17 as shown in FIG.
5a and a narrower pinch roll 175b, and a slightly larger diameter roll 175c is provided between each pinch roll 175b and the central drive roll 175a. By bending the paper 85 into a wavy shape, the paper 85
Transport is smooth.

FIG. 57 and FIG.
As shown in FIG. 8, the bottom plate 176a is inclined so as to be gradually higher toward the feeding side of the paper 85, and air vent holes 176c are opened in a plurality of places on both side plates 176b. By removing air between the continuously discharged paper 85, the paper 8
The falling speed of No. 5 has been increased so that it can cope with an increase in speed.

Next, the operation will be described with reference to the control system shown in FIG. 61 and the timing charts shown in FIGS. 62 to 67. The operation of the electrostatic printing apparatus having the above-described configuration includes two operations: a warm-up before starting copying, a copying operation, and a printing cycle. When the power switch of the copying machine main body 1 is turned on to start copying, the display section 181 provided on the operation panel 180 displays "OK" and the warm-up operation starts. At this time, the fixing device 160
The heat source 163 provided in the fixing roll 161 is energized to heat the surface of the fixing roll 161, and the pressing roll 162 provided below the fixing roll 161 is pressed against the fixing roll 161 by cam means (not shown). In this state, both rolls 161 and 162 are rotated and both are heated to the set temperature. A temperature detector (not shown) installed near the fixing roll 161
When it is detected that the surface temperature of the heat source 1 has reached the set value, the heat source 1
At the same time as the current supply to the power supply 63 is stopped, a warm-up completion signal is output, and the display section 181 displays “copy masquerade”.

Next, a normal copying operation will be described.
The original 2 to be copied is placed on the platen glass 3 provided on the upper portion of the main body 1 and the platen cover 6 is closed. In this state, the copy start button 183 is pressed. As a result, the optical system provided below the platen glass 3 starts exposure scanning of the document 2. The reflected light from the original 2 is reflected by the first to third mirrors 1.
2, 13 and 14, the condenser lens 17, the fourth mirror 19, and the like, and are condensed on the photosensitive member 37 wound around the peripheral surface of the scroll drum 39, and the electrostatic latent image is placed on the photosensitive member 37. An image is formed. This electrostatic latent image is developed by developing rolls 55 c and 55 b provided in the developing device 55 to become a toner image, and reaches the charger 140.

On the other hand, the copying machine body 1 has a two-stage paper tray 8.
1 is provided in the upper paper tray 81.
The lower and upper paper trays 81 can store 1000 sheets of paper 85, respectively. The size of the paper 85 stored in each tray 81 is detected by a paper size detection switch 94, and the operation panel 180. By selecting the number of copies and the reduction ratio before copying, the paper 85 corresponding to the document size and the reduction ratio is transferred from the paper tray 81 to the paper transport mechanism 11.
0 is sent to the transfer device 140. Transfer device 1
A registration roll 124 is provided in front of 40, and starts to rotate in synchronization with the rotation of the photoconductor 37, and the paper image is transferred by the transfer device 140 in a state where the toner image on the photoconductor 37 and the paper 85 are aligned. The toner image 85 is attracted to the photoconductor 37, and the toner image on the photoconductor 37 is transferred to the paper 85.
A part of the paper 85 that has reached the photoconductor 37 is
The leading edge of the paper 85 is on the peeling belt 131 provided so as to be in contact with the peripheral surface of the peeling belt 131.
When the tongue piece 131a provided on the
The sheet 85 is curved in a direction away from the photoconductor 37 along the line a, and the sheet 85 is separated from one end of the sheet 85. The leading end of the paper 85 separated from the photoreceptor 37 is a turn roll 1
49 and the turn belt 151 pressed into contact therewith, and while the sheet is sent to the vacuum suction / conveying means 145 by the turn belt 149 and the turn belt 151, the sheet 85 is positively peeled from the photosensitive member 37. become.

On the other hand, the paper 85 that has reached the vacuum suction conveyance means 145 is conveyed by the conveyance belt 1 by the suction action of the suction duct 155.
In a state where the belt 51 is pressed, the belt is conveyed to the fixing device 160 by rotation of the conveyor belt 151. During the warming-up operation, the fixing device 160 raises the temperature of the fixing roll 161 to a fixing-possible temperature, and when the paper 85 arrives, the toner image transferred onto the paper 85 between the fixing roll 161 and the pressure roll 162 is transferred. Fixing is performed. The sheet 85 on which the fixing is completed is peeled off from the fixing roll 161 by the peeling claw 171 of the paper peeling mechanism 170, and then is discharged to the discharge tray 176 by the discharge roll 175. Together with the copying operation is repeated by the number of copies amount that is set in advance, the speed during the copying operation is carried out in PV _1. During the copying operation, the cooling fan 30 rotates to continuously send cooling air along the lower surface of the platen glass 3 to cool the light source 8, the fixing device 160, and the paper 85 immediately after fixing, and the cooling air heated by cooling. Is discharged out of the main body 1 through the slit 4a.

The above is a normal copying operation. Next, a printing operation will be described. When a print mode is selected with a button on the operation panel 180, the print mode is entered. The printing mode includes a plate making process (speed PV ₂ ) for creating a print master and a printing process (speed PV ₃ ) for printing with the print master. First, the original 2 to be printed is set at a predetermined position on the platen glass 3, and the reduction ratio and the number of prints are set. In the case of printing, the number of sheets of paper 85 used increases,
The paper 85 to be used is set in advance in the lower paper tray 81 having a large storage capacity, and the lower tray 81 is pressed by a tray selection button.
Select

On the other hand, the printing mode includes an automatic printing mode and a manual printing mode. When the automatic printing mode is selected, all of the plate making process and the printing process for creating a print master are automatically performed. Can be performed separately. When the start button is pressed to start the printing operation by selecting the automatic printing mode or the manual printing mode, the exposure scanning of the original 2 on the platen glass 3 is performed in the same manner as in copying, and the exposure on the scroll drum 39 is performed. An electrostatic latent image is formed on the body 37. The non-image area of the electrostatic latent image is erased by the image area adjustment lamp 50 which is turned on according to the size of the document, reaches the developing device 55, and is developed by the developing rollers 55c and 55d of the developing device 55. Is performed.

On the other hand, since the paper transport mechanism 110 and the transfer device 140 are at rest during the plate making process, the developed toner image is not transferred to the paper 85 and the leading end reaches the developing device 55 again. If the manual print mode is selected in advance, the plate can be corrected at this stage. In correcting the plate, after selecting the manual printing step button for “plate making / correction”, the photoconductor unit 35 is pulled out from the main body 1 and an unnecessary portion of the toner image formed on the photoconductor 37 is deleted. After the correction, the plate whose correction has been completed is
5 is set again at a predetermined position by mounting, and the plate making process is restarted. Next, a fixing process of the toner image formed on the photoconductor 37 is performed. When the stop button is pressed at this stage, the fixing process is not started, and the photoconductor 37 is not cleaned.
The toner image formed thereon is removed by the developing rolls 55c and 55d of the developing device 55 also serving as a cleaning device.
At this time, the neutralizing corotron is turned on to facilitate toner cleaning. Further, the above operation is effective when a printing mode is selected by mistake or when a plate making correction error is made, and it is possible to prevent a plate from being made uselessly.

On the other hand, the toner image formed on the photosensitive member 37 is formed by the flash fixing device 52. The flash fixing device 52 employs a control method in which the lamp 51c emits light with the logical sum of the signal of the fixing start signal and the signal of the flash trigger from the viewpoint of preventing danger due to the high-pressure strong discharge. In addition, the light emission interval is set by counting the rotation synchronization signal of the scroll drum 39, and the photoconductor 37 is exposed in the rotation direction by a constant width to perform the entire fixing.
Rotational speed of the photosensitive member 37 at this time is PV _3. At the time when the toner image is fixed on the photoconductor 37 by the flash exposure by the flash fixing device 52, the charged position of the photoconductor 37 is reduced to near zero. In order to recover the original potential, the scroll drum 39 is idled five to six times with the uniform exposure / discharge lamp 51 turned on after fixing to charge the print master formed on the photoreceptor 37 to a constant potential. .

When the plate making process is completed, the distance from the home position of the scroll drum 39 to the leading edge of the image is detected during the plate making process in order to detect the image position and align it with the paper 85 during the printing process. It is counted by the number of clocks and stored in advance in the memory of the control system. By correcting the paper feed timing of the printing process paper 85 with this value, the image of the print master and the paper 85 are aligned. Further, plate information such as the plate size and the state of the plate of the print master is stored in the memory of the control system, and the information is used for determining whether or not the next process is possible. In the case where 81 is not set, a display such as "cassette gamut" is displayed, and such information can be deleted by turning on the power switch while pressing the clear key as needed, for example. . Therefore, by utilizing this, it is possible to perform multiple plate making of plates of different sizes and to perform auto valley copying.

Next, the printing process will be described. The printing process performs electrostatic printing using the print master created in the plate making process, and is similar to the above-described copying operation, and thus will be briefly described. However, unlike the copying operation, since there is no step of exposing the document 2, the rotation speed of the photosensitive member 37, the sheet feeding speed, and the conveying speed are the fastest speed PV ₄ . The print master that has reached the uniform exposure and neutralization lamp 31 by the rotation of the scroll drum 39 is uniformly exposed to light by turning on the uniform exposure and neutralization lamp 31, and at this time, an electrostatic image for printing is formed on the image portion. You.
When the electrostatic latent image reaches the developing device 55, the electrostatic latent image is developed into a toner image by the developing rolls 55 c and 55 d, and then transferred onto the paper 85 transported from the paper cassette 81 by the paper transport mechanism 110 to the transfer area of the transfer device 140. Transcribed within. The paper 85 on which the toner image has been transferred is a peeling belt 131.
After being separated from the photoreceptor 37 by vacuum
The sheet is conveyed to the fixing device 160 by 45 and the toner image is fixed on the sheet 85, and then discharged to the sheet discharge tray 176 by the discharge roller 175.

On the other hand, the photoreceptor 37 from which the paper 85 has been peeled off is again exposed by the uniform exposure and static elimination lamp 51 to form an electrostatic image on the image area. Thereafter, the toner image is transferred to the paper 85 through a development transfer step. You. That is, the printing process in which the toner image formed on the print master is transferred onto the paper 85 at high speed (PV ₄ ) rotation and fixed is repeated by the number of prints set in advance. It should be noted that the fixing speed of the fixing device 160 is constant in the printing process even in the copying process, and the speed difference generated in the printing process is absorbed by the vacuum suction conveyance unit 145 for conveying the paper 85 to the fixing device 160. The control of the heat source 163 provided in the fixing roll 161 of the fixing device 160 is performed as follows. An AC voltage as shown in FIG. 60 is applied to the heat source 163. The voltage applied during energization of the heat source 163 controls the number of turning on and the number of turning off, with a half cycle of the power supply frequency as a minimum single unit. The cage removal control is performed. The purpose of performing the demounting control is to regulate the power consumption while maintaining the rising characteristic of the fixing device 160, for example, 15
This is because the variation in the Colts heater used for the heat source 163 is ± 3% and the variation in the power is ± 1% or more by appropriately selecting the cage removal rate. The timing for removing the cage is as follows.
1 while the fixing device 160 is on, excluding the period from the start of energization from the cooling state 1 to the output of the fixable signal until the recovery to the fixable state after the output of the unfixable signal. And is limited to when the power supply voltage is equal to or higher than the specified voltage (95 V).

As a control device for performing the above control, for example, a circuit shown in FIG. 61 is used. The control circuit are input synchronization pulses V _B and the supply voltage V _S of the power supply, the power transistor Q ₃ the power supply voltage provided on the output side when the above defined are turned on and off, the power transistor Q ₃ is turned on At the time, origami is performed. Ie, between the heat source 163 to the transistor Q ₃ is turned on is controlled to be turned off.

When printing of a predetermined number of sheets is completed by the above operation, a cleaning process is started, the print master is neutralized by the uniform exposure and neutralization lamp 52, and is then cleaned by the oppositely charged developing rolls 55c and 55d to form an image. The attached toner is removed. Thereafter, winding of the photoconductor 37 is performed. By selecting “fixed plate” in advance, the winding of the photoconductor 37 can be prevented. As a result, the printing process using the same print master can be started again, and multiple printing in which a new plate is created on a print master that has already been created becomes possible. Next, the photoconductor 37
The winding operation of (5) will be described.
As shown in FIG. 9, black segment marks 37a are displayed at equal intervals. A continuous end mark 37b is displayed at the end. The winding of the photoconductor 37 is performed by a winding motor, and the length of the photoconductor 37 wound on the winding shaft 42 is determined by the segment mark 3.
7a is detected by reading the reflection type optical sensor.
In order to prevent the optical sensor from reading the black spot as the segment mark 37a, the detection of the segment mark 37a is ignored for the first fixed time, and the control is performed based on the control clock of the main body 1, so that the winding is performed at the time of winding. Malfunction due to speed fluctuations of Then, the segment mark signal is continuously read three times or more and 40 times or less,
When the own signal is read three times in succession, it is determined to be the segment mark 37a, and the winding of the photoconductor 37 is stopped.
Further, the segment mark 37a is read every 7.5 seconds, and when black is read 40 times or more in 30 seconds after the start of winding, the end mark 37b is determined, and the winding of the photoconductor 37 is performed in a 110 ° forward direction from the home position. When the end mark 37a is detected between the time when the winding button is pressed and the time when the end button 37 is moved to this position, the absence of the photosensitive member 37 is displayed to warn of the supply of the photosensitive member 37. ing. When the winding of the photoconductor 37 is completed by the above operation, the new photoconductor 37 is moved to the scroll drum 3.
9 Appear on the surface, ready to copy or print,
Copying and printing can be performed by selecting the copying and printing modes by the above operation.

The photosensitive member 37 in the scroll drum 39
Can be confirmed by a slit provided on the end face of the scroll drum 39, and at the end of the photoconductor 37,
The remaining amount of the photoreceptor 37 is displayed on the display section 181 as "one more frame". When the take-up button is pressed in this state, a message “Please replace the photoconductor” is displayed, and the segment mark 3
If 7a is not detected, it is determined that the winding is defective,
This is displayed on the display unit 181. Similarly, if a clock signal is not output from the winding motor even when the winding operation is started, it is displayed as a winding failure, and the winding operation is performed by pressing the winding button and pressing the clear button to prevent erroneous replacement of the plate and erroneous operation. Therefore, safety measures are taken so that winding can only be started. In addition, during winding, the motor is rotated while applying a current limit while the feeding shaft 40 is clocked by the ratchet so that the photoconductor 37 is not loosened, and tension is applied to the photoconductor 37.

To replenish the photoconductor 37, first, the photoconductor unit 35 is pulled out from the main body 1, a new roll of the photoconductor 37 is loaded on the feeding shaft 40, and the photoconductor 37 pulled out from the slit 39a is transferred to the scroll drum. After circumventing the periphery of 39, the scroll drum 39 is again passed through the slit 39a.
It is drawn in and wound on the winding shaft 42. When the photoreceptor unit 35 is loaded into the main body 1 again in this state and the front cover of the main body 1 is closed, the display section 181 displays "Press the winding button." 37 may be wound. In addition, by performing a cleaning process after winding, it is possible to remove dirt such as toner adhered to the fed photoconductor 37 and
When the take-up button is pressed after the paper jammed paper 85 is removed, first, a cleaning process is performed, and then the photosensitive member is taken up to prevent contamination.

FIG. 62 shows the operation timing of each unit in the copy mode, FIG. 63 shows the operation timing of each unit in the refresh cycle, FIG. 64 shows the operation timing of each unit in the manual plate making, and FIG. FIG. 66 shows the operation timing of each unit in forming two images on the photosensitive member 37, FIG. 66 shows the operation timing of each unit in the print mode, and FIG. 67 shows the operation timing in the mode.

[0069]

As described in detail above, according to the first aspect of the present invention,
Is the scroll drum housing the rolled photoreceptor.
Provide a mask plate on the lit part and
On the inner surface of the
A small slope, and a large slope on the rear side
The developer released from the photoreceptor slips
The scroll drum
As the ram rotates, it moves rearward due to inertia,
Scroll by the large slope on the back side of the rate
Since it is discharged outside the drum, it is
Image agent stays and is stored in the scroll drum
It is possible to prevent unused photoconductors from being stained.
Wear. According to the second aspect of the present invention, the mask plate
The outer peripheral surface has a shape corresponding to the outer peripheral surface of the scroll drum.
Notch is formed at the top and at the tip, so development during development
Use a mask to play the tip of the developer on the roll surface
The developer that has been cut is
Prevents intrusion into the scroll drum through the slit
Development, which allows the development to enter the scroll drum
There is an effect that the amount of the agent can be greatly reduced. Further
According to the third aspect of the present invention, the outer peripheral surface of the mask plate is
As is apparent from FIG.
Slightly immersed in the outer peripheral surface. This allows development
When the amount of developer in contact with the outer peripheral surface of the mask plate is small
Developer that adheres to the outer peripheral surface
Of the scroll drum during rotation
can do.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of an electrostatic printing apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 3 is a partially omitted plan view showing a driving unit of an optical system of the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 4 is a partially omitted plan view showing a driving unit of an optical system of the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 5 is a partially omitted front view showing a driving unit of an optical system of the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 6 is a partially omitted side view showing a driving unit of an optical system of the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 7 is a diagram illustrating the operation of the electrostatic printing apparatus according to one embodiment of the present invention when the top cover is opened and closed.

FIG. 8 is a diagram illustrating the operation of the electrostatic printing apparatus according to one embodiment of the present invention when the top cover is opened and closed.

FIG. 9 is a sectional view of a top cover provided in the electrostatic printing device according to one embodiment of the present invention.

FIGS. 10A and 10B are explanatory diagrams of a scroll drum provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 11 is a perspective view of a charger provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 12 is an enlarged view of a main part of a charger provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 13 is a sectional view of an image area adjustment lamp provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 14 is a side view of a uniform exposure and static elimination lamp provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 15 is a sectional view of a uniform exposure and static elimination lamp provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 16 is a plan view of a uniform exposure and static elimination lamp provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 17 is an explanatory diagram of a developing roll provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 18 is a sectional view of a stirring roll provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 19 is an explanatory diagram of a developing device provided in the electrostatic printing device according to one embodiment of the present invention.

FIG. 20 is an explanatory diagram of a toner density detector provided in the electrostatic printing device according to one embodiment of the present invention.

FIG. 21 is a side view of a cross mixer provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 22 is a sectional view of a cross mixer provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 23 is an explanatory diagram of an auger provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 24 is a detailed view of a developing device provided in the electrostatic printing device according to one embodiment of the present invention.

FIG. 25 is a detailed view of a driving unit of a developing device provided in the electrostatic printing device according to one embodiment of the present invention.

FIG. 26 is an explanatory diagram of an agitator provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 27 is an explanatory diagram of a developing unit positioning section provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 28 is an explanatory diagram of a developing unit positioning section provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 29 is an explanatory diagram of a developing unit positioning section provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 30 is an explanatory diagram of a developer supply unit provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 31 is a plan view of a developer supply unit provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIGS. 32A and 32B are explanatory views of a sheet feeding means provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 33 is an explanatory diagram of a sheet feeding unit provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 34 is an explanatory diagram of a sheet feeding unit provided in the electrostatic printing apparatus according to an embodiment of the present invention.

FIG. 35 is an explanatory diagram of a sheet feeding unit provided in the electrostatic printing apparatus according to an embodiment of the present invention.

FIG. 36 is an explanatory diagram of a sheet feeding unit provided in the electrostatic printing apparatus according to an embodiment of the present invention.

FIG. 37 is an explanatory diagram of a sheet feeding unit provided in the electrostatic printing apparatus according to an embodiment of the present invention.

FIG. 38 is a detailed view of a sheet transport mechanism provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 39 is a detailed view of a sheet transport mechanism provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 40 is an explanatory diagram of a sheet guide provided in the electrostatic printing apparatus according to an embodiment of the present invention.

FIG. 41 is an explanatory diagram of a sheet guide provided in the electrostatic printing apparatus according to an embodiment of the present invention.

FIG. 42 is an explanatory diagram of a sheet peeling section provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 43 is an explanatory diagram of a sheet peeling section provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 44 is an explanatory diagram of a sheet peeling section provided in the electrostatic printing apparatus according to an embodiment of the present invention.

FIG. 45 is an explanatory diagram of a sheet peeling section provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 46 is an explanatory diagram of a sheet peeling section provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 47 is an explanatory diagram of a sheet peeling section provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 48 is an explanatory diagram of a transfer corotron provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 49 is an explanatory diagram of a transfer corotron provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 50 is an explanatory diagram of a vacuum suction and conveyance unit provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 51 is an explanatory diagram of a vacuum suction and conveyance unit provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 52 is an explanatory diagram of a fixing device provided in the electrostatic printing device according to an embodiment of the present invention.

FIG. 53 is an explanatory diagram of a fixing device provided in the electrostatic printing device according to an embodiment of the present invention.

FIG. 54 is a detailed view of a sheet peeling mechanism provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 55 is an explanatory diagram of a discharge roll provided in the electrostatic printing apparatus according to an embodiment of the present invention.

FIG. 56 is an explanatory diagram of a discharge roll provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 57 is an explanatory diagram of a discharge tray provided in the electrostatic printing device according to an embodiment of the present invention.

FIG. 58 is an explanatory diagram of a discharge tray provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 59 is an explanatory diagram of a photosensitive member provided in the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 60 is an explanatory diagram of the removal control of the electrostatic printing apparatus according to an embodiment of the present invention.

FIG. 61 is a circuit diagram showing a control circuit of the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 62 is a timing chart showing the operation of the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 63 is a timing chart showing the operation of the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 64 is a timing chart showing the operation of the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 65 is a timing chart showing the operation of the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 66 is a timing chart showing the operation of the electrostatic printing apparatus according to one embodiment of the present invention.

FIG. 67 is a timing chart showing the operation of the electrostatic printing apparatus according to one embodiment of the present invention.

[Explanation of symbols]

2. Original document, 37. Photoconductor, 39. Scroll drum, 3
9a: slit, 41: mask plate, 41b, 41
c: inclined surface, 55: developing device, 85: paper, 160: fixing device.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akiyoshi Inoue 2274 Hongo, Ebina-shi, Kanagawa Prefecture Fuji Xerox Co., Ltd.Ebina Office (72) Inventor Yutaka Yakabe 2274 Hongo, Ebina-shi, Kanagawa Prefecture Fuji Xerox Co., Ltd. In-house (72) Inventor Koji Ohashi 2274 Hongo, Ebina-shi, Kanagawa Prefecture Fuji Xerox Co., Ltd.Ebina Office (72) Inventor Haruka Yoshimura 2274 Hongo, Ebina-shi, Kanagawa Prefecture Fuji Xerox Co., Ltd.Ebina Office (72) Inventor Toshiichi Kageyama 2274 Hongo, Ebina-shi, Kanagawa Prefecture Fuji Xerox Co., Ltd.Ebina Office (72) Inventor Hiroshi Tokiwa 2274 Hongo, Ebina-shi, Kanagawa Prefecture Fuji Xerox Co., Ltd.Ebina Office (72) Inventor Yutaka Nakayama Ebina, Kanagawa Prefecture Ichimoto 2274, Township Fuji Xerox Co., Ltd.Ebina Business Center (72) Inventor Hiroshi Sato 2274 Hongo, Ebina City, Kanagawa Prefecture Fuji Xerox Co., Ltd.Ebina Business Center (72) Inventor, Toshikazu Sekida 2274 Hongo, Ebina City, Kanagawa Prefecture Fuji Xerox Within Ebina Works Co., Ltd. (72) Inventor Shinji Takashina 2274 Hongo, Ebina City, Kanagawa Prefecture Inside Fuji Xerox Co., Ltd. (72) Inventor Shozo Yamamoto 2274 Hongo, Ebina City, Kanagawa Prefecture Fuji Xerox Co., Ltd. Ebina Office (56) References JP-A-59-226375 (JP, A) JP-A-58-55946 (JP, A) Japanese Utility Model Showa 58-192668 (JP, U) Japanese Utility Model Showa 56-120568 (JP, U)

Claims (3)

(57) [Claims] A door having an elongated slit formed in an axial direction.
The ram body and the sheet housed inside the drum body
The outer peripheral surface of the drum body through the slit
Scrolling drum including feeding means for feeding out along the top
And a screen from which the photoconductor is fed by the feeding means.
By rotating the roll drum, the electrostatic latent
In an electrostatic printing apparatus that develops an image with a developer, In order to prevent developer from entering the slit,
Close the gap of the slit with the light body extended
Provide an elongated mask plate in the axial direction
Direction of rotation of the scroll drum inside the plate
The first inclined surface on the front side with respect to and after the opposite direction
On the side, having a larger inclination angle than the inclination angle of the first inclined surface
Characterized by forming a ridge line consisting of two inclined surfaces
Electrostatic printing device. 2. An outer peripheral surface of the mask plate,
And the outer surface of the scroll
Hold a notch along the axis in front of the drum rotation
2. The electrostatic indicium according to claim 1, wherein:
Printing equipment. 3. The scroll drum according to claim 2, wherein
A delivery roller that is provided inside and winds a sheet-shaped photoconductor.
And a pair along each side parallel to the axis of the slit.
And the sheet-like photoreceptor from the delivery roll is
A first roll turned over on the outer peripheral surface of the drum body;
Fold the sheet-shaped photoconductor from the first roll inside
A second roll, and a sheet-shaped photoconductor from the second roll
And a winding roll that winds the inside of the
The outer surface of the drum body is between the first and second rolls.
When the mask plate is slightly immersed from the outer peripheral surface,
Claim 1 or Claim characterized by being provided
3. The electrostatic printing device according to claim 2.