JPH03238469A - Image forming device - Google Patents

Abstract

PURPOSE:To attain the miniaturization of a device and to form the image of a cardboard original by forming an original carrying path in a vertical direction inside a case and disposing an original carrying roller and the original reading part of a process unit along the original carrying path. CONSTITUTION:The original carrying path L is formed by carrying guides 24 and 25, relaying rollers 2, 3, and 4, and an original feeding roller 1, from the top surface 108 of the case C at the inside of the case C in the upper and lower directions perpendicular to the top surface 108. On the other hand, a fluorescent lamp 5, the heater 18 of the fluorescent lamp, and a rinse 6 are disposed on the back surface side of a contact glass 7 to constitute the original reading part optically scanning an original. Therefore, when the original carrying path L is formed in the vertical direction, the original can be carried without being bent. Thus, the cardboard original can be carried, a space required for setting the original carrying path is reduced and the device is miniaturized and thinned.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an image forming apparatus, and more particularly to an electrostatic photographic image forming apparatus.

[Prior Art] Conventionally, an electrostatic latent image of the original is formed on a photoreceptor by exposing the original, and a toner image of the original is formed on the photoreceptor by developing this electrostatic latent image. 2. Description of the Related Art An electrostatic image forming apparatus is known that transfers and fixes a toner image onto a transfer paper to form an image of a document on the transfer.

This type of image forming apparatus includes a so-called horizontal type in which a photoreceptor is arranged horizontally, and a so-called vertical type in which a photoreceptor is arranged in a vertical direction. Horizontal image forming devices can be formed with a small overall height, making them suitable for use in table devices, while vertical image forming devices can be formed with a small installation area.
Suitable for floor standing.

FIGS. 10 and 11 are explanatory diagrams showing the configuration of a conventionally proposed vertical image forming apparatus, respectively.

Among these, in the one shown in FIG. 10, a photoreceptor 41 is disposed vertically within a case C, and a U-shaped document conveyance path L is formed above the photoreceptor 41.

From the paper feed port l opened on the top surface of the case C to the transport path L1
During the process of ejecting the document from the placement port 0, the document is exposed to light by a fluorescent lamp 5 at the contact glass 7 position, and in the rinse 6, the reflected light from the image of the document is transferred to the photoreceptor 41.
The image is projected onto.

On the other hand, a transfer paper conveyance path L2 is formed between the upper surface of the case C and the transfer paper cassette 52, and in this conveyance path L2, a transfer charger 12 is provided at a close facing MK to the photoreceptor 41.
is provided.

The image formed on the photoreceptor 41 is developed by the developing device 15 to form a toner image, and this toner image is transferred by the transfer charger 12 to the transfer paper sent out from the cassette 52, and then transferred to the fixing device. The original image is fixed on the transfer paper by P.

In the case shown in FIG. 11, a belt device B for conveying the original is attached to one side of the case C, and the case C and the belt device B form a conveying path L, l for conveying the original. On the other side of C, transfer paper transport paths L and l are formed so as to sandwich the photoreceptor 41 with the transport path L□'. The configuration of other parts is the same as that of the vertical image forming apparatus already explained using FIG. 10, and image formation is performed by the same operations as described above.

In addition, Japanese Patent Application Laid-open No. 12563/1983 discloses a portable copying device in which a part of the side surface of the main body is opened during copying to form a paper feed tray. In this copying apparatus, a photoreceptor is disposed vertically within a case, and a document is conveyed horizontally through the upper end of the case.

[Problems to be Solved by the Invention] In the conventional image forming apparatus shown in FIG. 10, since the transport path L1 is formed in a curved shape, it is not possible to transport thick originals. Also, from the paper feed slot i to the contact glass 7
Since the distance between the paper and the paper is short and the document is transported in one direction, it is not possible to read the image density and size of the yK document.

Furthermore, in the conventional image forming apparatus shown in FIG.
1, the original transport path L1 and the transfer paper transport path L1 sandwich the paper.
, r, it is not possible to make the horizontal width of the device very small, and it is also impossible to read the image density and size of the document.

Furthermore, the copying apparatus disclosed in Japanese Patent Application Laid-Open No. 60-12563 requires a large ff.
Since it requires 1F area and the original is transported in one direction, it is also impossible to read the image density and size of the original.

The present invention has been made in view of the current state of this type of image forming apparatus as described above, and its first object is to enable significant miniaturization by reducing the horizontal width of the apparatus. A second object of the present invention is to provide an image forming apparatus that can also form images on thick paper originals.A second object of the present invention is to provide an image forming apparatus that can simultaneously read the image density and size of originals.

[Means for Solving the Problems] In order to achieve the first object, the present invention includes a plurality of process units that operate in each process of image formation in a case, and operates each of these process units. In an image forming apparatus that transfers an image of a document onto a transfer paper conveyed within the case, an document conveyance path is formed in the case in a vertical direction, and a document conveyance roller and a document conveyance path are formed along the document conveyance path. , and a document reading section of the process unit.

Further, in order to achieve the second object, the present invention includes a plurality of process units that operate in each process of image formation in a case, and by operating each of these process units, the image is transported within the case. In an image forming apparatus that transfers an image of a document onto transfer paper, an document conveyance path is formed in the case in a vertical direction, and a document conveyance roller having a switchback means for the document is provided along the document conveyance path. , a sensor unit that detects the image density and size of the document, and a document reading section of the process unit that forms an image according to the detection result of the sensor unit.

[Function] When the document conveyance path is formed in the vertical direction, the document can be conveyed without being curved, so that thick paper documents can be conveyed. Further, since the space required for setting the document conveyance path can be reduced compared to the case where the document conveyance path is formed in a curved shape, the apparatus can be made smaller and thinner.

On the other hand, if a document switchback means is added to the document conveyance roller and the predetermined sensor unit is arranged in the document conveyance path, the image of the document: atL and It is possible to form an image based on the detection result in the process of detecting the size and then discharging the document by rotating the rollers in reverse, so that a high-quality image can be formed on transfer paper of an appropriate size.

[Example code] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 to 3 are perspective views showing the external structure of the embodiment, FIG. 1 is a perspective view when not in use, and FIGS. 2 and 3 are perspective views during the process of copying. It is a diagram.

As shown in these figures, in the embodiment, the case C of the main body is composed of a front cover 101, a rear cover 104, side covers 102, 103, a bottom cover 107, and a manual document feed table 61.

This manual document feed table 61 is provided with a handle 106, and can be opened and closed relative to the case C by holding the handle 106 and rotating it around the side edge on the side cover 102 side. There is.

2 and 3 show the case where the manual document feed table 61 is opened, and the upper surface 108 of the case C has an operation section 51.
Toner exchange lid 63, open/close switch 36, and louver 10
5 is provided. Further, a pair of side guides 62 are attached to the open surface of the manual document feed table 61, and the facing distance between the side guides 62 can be adjusted.

In this way, the interval between the side guides 62 of the manual document feed table 61 when opened is adjusted according to the document width size, so that the document can be inserted into the case C from between the site guides 62 of the manual document feed table 61. It's becoming Leni.

To the cassette storage section 1 stored in case C,
As shown in FIG. 3, it can be pulled out from the front cover 101. Then, along the cassette guide 115 of the cassette storage section IA pulled out from the front cover 101, the cassette 52 with transfer paper set can be inserted into the cassette storage section 1A.

Further, when the manual document feed table 61 is opened as described above, the open/close switch 36 is activated and warm-up is started, and the fixing heater, fluorescent lamp heater, and cooling fan, which will be described later, complete warm-up after about 20 seconds. The information is displayed on a display section (not shown). moreover,
When the cassette storage section 1A in which the cassette 52 is inserted and set is pushed into the case C, the set state is detected and a set display is displayed on a display section (not shown).

FIG. 4 is an explanatory diagram showing the internal configuration of the embodiment, FIG. 5 is an explanatory diagram showing the configuration of the paper feed section of the embodiment, FIG. 6 is an explanatory diagram showing the configuration of the drive section of the embodiment, and FIG. 8 is an enlarged explanatory view of the fixing device portion of the embodiment, and FIG. 8 is a circuit diagram of the electrical unit of the embodiment.

As shown in FIG. 4, the document is moved from the top surface 108 of the case C in the vertical direction perpendicular to the top surface 108 within the case C by the conveyance guides 24, 25, the relay roller 2°3.4, and the document supply roller 1. A conveyance path is formed. The upper opening of this document transport path is set near the opened manual document feed table 61 and the setting 67 of the side guide 62, and the document placed on the manual document feed table 61 is placed in the upper opening. The document can be transported through the document transport path.

In the vicinity of the opening, a document feed sensor 31 is disposed along the conveyance path, and the relay roller 2 and the document feed roller 1
In between, a document holding section 26 and a contact glass 7 are provided on the conveyance path and facing the document holding section 26.

A fluorescent lamp 5, a fluorescent lamp heater 18, and a rinse 6 are arranged on the back side of the contact glass 7, and constitute a document reading section that optically scans the document. Further, a leading edge detection sensor 32 is arranged between the contact glass 7 and the relay roller 2 along the document conveyance path. Furthermore, the rinse 6
An optical sensor unit 35 for reading the image density and size of the original is provided near the setting position, so that the image density and size of the original can be detected.

Between the relay rollers 3 and 4, the document conveyance path branches to form a transfer paper conveyance path L8. It is guided to a cassette 52 containing a soft material, and also to a separate case C3 which is used by being connected to the case C as appropriate.

As shown in FIG. 5, the transfer paper P is set in the cassette 52, the cassette 52 is covered with a cassette lid 52C, and the transfer paper P is prevented from shifting internally.

A foot roller 21 is disposed near the tip of the cassette 52, and a pickup roller 21P is attached to a cam rotatable about the feed roller 21. Further, a paper presence/absence sensor 37 is attached to the cassette 52.

When the cassette 52 is inserted into the case C, the pink up roller 2IP is positioned above and away from the transfer paper P, and when the leading edge detection sensor 32 detects the leading edge of the document, the feed roller 21 and the pickup roller 21
P is driven, the pickup roller 21P moves in a direction in which it contacts the transfer paper P, feeds the transfer paper P to the position of the feed roller 21, and rotates away from the transfer paper P again.

In the transfer paper transport path L5, a registration roller 13 is provided downstream of the feed roller 21 in the transport direction of the transfer paper P, a transfer charger 12 is provided downstream of this registration roller 13, and a registration roller 13 is provided near the registration roller 13. A sensor 33 is arranged.

Near the branching point between the document transport path and the transfer paper transport path Ls,
It has a configuration as shown in Figure 7.

A fixing device xo9 consisting of a fixing roller 19 and a pressure roller 11 is disposed downstream from the transfer charger 2 in the conveying direction of the transfer MP, and a cleaning roller 110 is further disposed downstream of the fixing device 109. ing.

Above the fixing device 109 and the cleaning roller 110, a suction cooling fan 10a and a blowing cooling fan 10 are provided.
A cooling device 111 is provided for cooling the transfer paper P and the like. Further, a cleaning blade 3b for removing toner adhering to the relay roller 3 is in contact with the relay roller 3 disposed near the ventilation cooling fan 10b.

As shown in FIG. 7, cooling device 2111. The cleaning roller 110 and the fixing device 109 are housed in a sealed case 112.
This prevents the toner from spreading outside.

As shown in FIG. 4, a photoreceptor 41 wound around rollers 41a and 41b is disposed approximately in the center of the case C.
At the wrapping position with respect to the roller 41b, the photoreceptor 41 is closely opposed to the transfer charger 12.

Further, at the winding position with respect to the roller 41a, the photoreceptor 41
faces the rinser 6, and at this position, the rinser 6 forms an image of reflected light from the original on the photoreceptor 41. A cleaning device 9 is disposed in contact with the photoreceptor 41 between the rinse 6 and the transfer charger 12,
Between the cleaning device 9 and the rinse 6, a static eliminating LED array 8 is placed on the side of the cleaning device 9, and a main charger 16 is placed on the side of the rinse 6, each of which is placed close to and opposite to the photoreceptor 41.

A developing device 15 is disposed downstream of the rinse 6 in the direction in which the photoreceptor 41 is transported, and is disposed close to and facing the photoreceptor 41, and between the developing device 15 and the transfer charger 12,
Six seam sensors 34 are arranged close to and opposite to the photoreceptor 41.

Next, the document conveyance system, transfer paper conveyance system, and active device for activating the photoreceptor will be explained.

As shown in FIG. 6, the active device of the embodiment includes a solenoid 116 for a motor gear IIA that is activated by a motor.
By the opening movement, either the forward rotation gear 117 or the reverse rotation gear 118 is switched into engagement. In the figure, a state in which the forward rotation gear 117 is engaged with the motor gear IA is shown, and the output gear 119 is engaged with the forward rotation gear 117.
This output gear 119 includes a document drive gear 120 and a relay gear 1.
22 and a main body active gear 121 having a one-way clutch 123 are engaged.

The document active gear 120 is connected to each of the document transport rollers 1, 2, 3.4 via a power transmission mechanism (not shown), and the main body active gear 121 is connected to the document conveyance rollers 1, 2, 3.4.

It is connected to the rollers 11, 13, 21 for conveying the transfer paper, the roller 41b for activating the photoreceptor, etc. via a power transmission mechanism (not shown). Note that the one-way clutch 123 is connected to motor gear 1 only when main body drive gear 121 rotates clockwise. The active force of LA is transmitted to a shaft (not shown).

In the state shown in FIG. 6, when motor gear IIA rotates clockwise, rotation is transmitted to each gear as shown by thin arrows, output gear 119 rotates clockwise, and document active gear 120 rotates counterclockwise. As a result, the rollers 1, 2, 3, and 4 are opened in the document conveyance direction via a power (not shown) speed mechanism. At this time, the one-way clutch 123 idles, and the shaft on which the main body active gear 123 is mounted is rotated. Rotation is not transmitted, so the transfer paper conveying roller and the photoreceptor 41 are not driven.

When the solenoid 116 is activated from the state shown in the figure, the motor gear IIA engages with the reversing gear 118, rotation is transmitted to each gear as shown by the thick arrow, and the document active gear 1
20 rotates clockwise. Therefore, the document conveyance rollers 1, 2,
The rotation directions of 3 and 4 are reversed, and the original can be conveyed in the ejection direction.

In this case, the main body drive gear 123 also rotates clockwise, and the transfer paper conveying rollers 11, 13, 21, the photoreceptor 4, etc. can be actively operated in a predetermined rotation direction.

In this manner, in the state shown in FIG. 6, only the document active system is moved by the document active gear 120 by the motor activated by the detection signal of the document feed sensor 31. Additionally, when the solenoid 116 is activated,
The document active system is driven by the document sliding gear 120, and the transfer paper conveyance system and the photoreceptor active are simultaneously driven by the single main body drive gear 123.

The circuit of the electrical unit of the embodiment is as shown in FIG.
The AC line includes an interlock switch 300° 301, a noise filter 302, a main switch 303, a triac 304, a thermostat 305, a halogen heater 306, a main motor 307, a fan motor 308,
307.

In addition, a DC line constituted by a DC power supply 311 via an R source transformer 310 is connected to a power pack transformer 31.
2 to the transfer charger 12. 22
The V line is connected to the total counter 315, paper feed solenoid 316, and resist solenoid 3 via the relay board 314.
17.

The relay board 314 is connected to the main PCB 318 so as to be able to send and receive signals, and the 22V line of the main PCB 318 includes a fluorescent lamp 5, a fluorescent lamp ballast 320, a power back converter 321, a static elimination LED array 8, and a fluorescent lamp heater. 18 are connected. The output of the power back converter 321 is supplied to the main charger 16 via the varistor 87a.

A 5V line from the DC power supply 311 is connected to a paper feed sensor 325, a paper discharge sensor 326, and a thermistor 327 via a relay board 314. Similarly, the 22V line is connected to the dimming sensor 32 via the main PCB 318.
8. Collected toner sensor 329, seam sensor 330, pulse generator 331, toner end detection sensor 332
It is connected to the.

Next, the operation of the embodiment having the configuration described above will be explained.

When the manual document feed table 61 is opened, the opening/closing switch 36 is turned on and warm-up is started, and after about 20 seconds, the warm-up of the fixing heater 17 of the fixing roller 19, the heater 18 of the fluorescent lamp 5, and the cooling device 111 is completed. Then, a message indicating that the warm-up has been completed is displayed on the display section.

Cassette storage section IA pulled out from front cover 101
When the cassette 52 containing the desired size of transfer paper P is inserted along the cassette guide 115 and the cassette storage section IA is inserted into the case C, the insertion sensor is detected by the cassette sensor and the paper presence/absence sensor 37. A message indicating that the setting is complete is displayed on the display unit.

The side guide 62 of the manual document feed table 61 is adjusted to the width of the document, and the document is inserted through the manual document feed table 61 from the opening of the document transport path.

When the inserted document hits the document feed roller 1 and the document feed sensor 31 detects the document, skew correction time is secured and the document feed roller 1 is removed after a certain period of time has passed.
starts driving. At the same time, the fluorescent lamp 5 is turned on.

In this state, the drive device is in the driving state shown in FIG. 6, the main body drive gear 121 is not activated, and the document is conveyed downward along the document conveyance path. When the trailing edge of the document is detected by the leading edge detection sensor 32, the motor is stopped and conveyance of the document is stopped. In this manner, while the document is conveyed downward, the optical sensor unit 35 reads the degree of image distortion and size of the document.

After a certain period of time, the solenoid 116 shown in FIG. 6 is activated, the motor resumes driving, and the document is switched back in the opposite direction, upward.

The document transported upward is pressed against the contact glass 7 by the document holding unit 26, and the light reflected from the document blood from the fluorescent lamp 5 onto the document is transferred to the rinse 6.
The image is projected onto the photoreceptor 41 by the following steps.

In this state, the photoreceptor 41 is driven by restarting the drive of the motor, and in synchronization with this, the transfer charger 12 and the static eliminator LE are activated.
The D array 8, main charger 16, and cleaning device 9 are turned on. Therefore, after the residual toner is cleaned by the cleaning device 9 and static elimination processing is performed by the RLED array 8, the main chassis charger 1
The rinse 6 performs projection onto the surface of the photoreceptor 41 uniformly charged in step 6, and an electrostatic latent image of the document is formed on the photoreceptor 41.

The original that has been exposed in this way is transported from the original transport path by the original supply roller 1 and the relay rollers 2, 3.4.
It is discharged to the outside of case C.

The photoreceptor 41 on which the latent image of the document is formed is transferred to the developing device 15 position, and the developing device 15 visualizes the latent image into a toner image.

On the other hand, when the motor resumes driving, a paper feed solenoid (not shown) is turned on, and the clutch of the paper feed unit is driven, and the paper stacked in the cassette 52 is moved by the feed roller 21 and pickup roller 21P, which are engaged with the clutch. One sheet is taken out and sent to the feed roller 21,
They are separated and conveyed by the friction pad 22.

The separated transfer paper passes through a transfer paper transport path L8 made up of guide plates 46 and 47 and comes into contact with the registration rollers 13, and the registration rollers 13 are driven by a clutch engaged with the shaft of the registration rollers 13. , the transfer paper is conveyed so as to come into contact with the developed image on the photoreceptor 41 at the transfer charger 12 position.

In this case, the registration sensor 33 detects the jam.

The registration roller 13 can also be driven by a detection signal from a seam sensor of the photoreceptor 41.

The toner image on the photoreceptor 41 is transferred by the transfer charger 12 onto the transfer paper transported in this manner.

The transfer paper on which the toner image has been transferred is held between a fixing roller 19 and a pressure roller 11 under pressure in a fixing device 1109 shown in FIG. Unfixed toner is removed.

In the embodiment, the guide plates of the transfer paper transport path L5 and the original transport path, the cleaning roller 110, and the transfer paper are cooled by the cold air from the cooling device 111, so that the toner on the transfer paper after fixing is rapidly cooled, and the toner is quickly becomes completely fixed, and almost no unfixed toner exists.

Even if there is a small amount of unfixed toner left on the transfer paper, this toner is removed by the cleaning roller 110.

Even if a small amount of unfixed toner remains on the transfer paper conveyed on the document conveyance path and this toner adheres to the relay roller 3, this toner is removed by the cleaning blade 3b. No toner remains.

When the registration sensor 33 confirms that no jam has occurred and the document feed sensor 31 detects the passage of the trailing edge of the transfer paper, a signal is given to the seam sensor 34, and the seam sensor 34 detects the passage of the photoreceptor belt 41. The motor is turned off at the position where the detection mark is detected. At the same time, the transfer charger 12, LED array 8, and fluorescent lamp 5 are turned off.

The main charger 16 is turned off when the document is conveyed upward in the document conveyance path and the end of the document passes through the rinse 6 position. Further, the paper feed solenoid is turned off in synchronization with the ON of the register solenoid, and the registration solenoid is turned off in synchronization with the detection of the trailing edge of the transfer paper by the document feed sensor 31.

In this way, the transfer paper on which the image is formed is transferred to case C.
The copy processing operation is completed and the printer enters a standby state.

When the manual document feed table 61 is closed after all copy processing is completed, the open/close switch 36 is turned OFF.
Heater 18 for fluorescent lamp 5, fixing heater 1 for fixing roller 19
7. The bow cooling fan 10a and the ventilation cooling fan 10b of the cooling device 111 are turned off.

In this way, in the embodiment, the document conveyance path is formed in the vertical direction so that the document can be conveyed without being curved, so that it is possible to convey thick paper documents.

In addition, since the document conveyance path is formed vertically and a part of this document conveyance path is shared with the transfer paper conveyance path L5, the configuration of the conveyance path is simplified, and the case C is oriented horizontally. can be significantly reduced.

Furthermore, in the embodiment, Ω-back 12.3.
4 is configured to be capable of forward and reverse rotation, and the original is switched back during the original transport path, so that the image density and size of the original are detected during the process of feeding the original, and the original is then ejected. In the process, image formation can be performed based on the detection results, and a high-quality image can be formed on transfer paper of an appropriate size.

Further, according to the embodiment, since the cooling device 111 cools the transfer paper transport path Ls, the document transport path, the cleaning roller 110, and the transfer paper, the toner on the transfer paper quickly becomes completely fixed, and only a small amount remains. The unfixed toner is removed by the leaning roller 110.

Even if residual unfixed toner adheres to the relay roller 3 for some reason, this toner will be removed by the cleaning blade 3b, so that it will not damage the document transport path, the relay rollers 2 and 3, and even the document feed roller 1. , not contaminated with toner.

Therefore, toner does not stain the original or the transfer paper.

In the above embodiment, part of the document transport path and the transfer paper transport path Ls are shared, but as shown in FIG.
It is also possible to completely separate both transport paths and Ls. In this way, it becomes possible to take out the original and the transfer paper separately, making it convenient to use.

Further, in the embodiment, the document transport rollers 1.2,
A document switchback means is added to 3.4, and the image density and size of the document are detected by the sensor unit 35 before image formation by the document reading section. In a type of image forming apparatus that does not perform this type of switching, the switchback means and sensor unit can be omitted. In this case as well, it is possible to significantly reduce the width of the case C in the horizontal direction, and it is possible to carry out thick paper originals.

[Effects of the Invention] As described above, according to the invention described in claim 1, since the document conveyance path is formed in the vertical direction, it is possible to convey thick paper documents, and the device can be made smaller and thinner. can be achieved. On the other hand, according to the invention as set forth in claim 2, in addition to producing the same effects as described above, a sensor unit for detecting the image density and size of the original is provided in the original transport path, so that the roller for transporting the original can be rotated in the forward and reverse directions. As a result, a high quality image corresponding to the image density of the original can be formed on a transfer paper of an appropriate size.

[Brief explanation of drawings]

1 to 8 are diagrams explaining one embodiment of the present invention, in which FIG. 1 is a perspective view showing the external configuration when not in use, and FIGS. 2 and 3 are in the preparation process for copying. FIG. 4 is an explanatory diagram showing the internal configuration, FIG. 5 is an explanatory diagram showing the configuration of the paper feed section, FIG. 6 is an explanatory diagram showing the configuration of the drive section, and FIG. 7 is an explanatory diagram showing the configuration of the drive section. An enlarged explanatory view of the fixing device portion, FIG. 8 is a circuit diagram of the electrical unit, FIG. 9 is a sectional view showing another embodiment of the present invention, and FIGS. 10 and 11 are the configuration of a conventional image forming apparatus. FIG. 1...Document supply roller, IA...Cassette storage section, 2-4...Relay roller, 5...
...Fluorescent light, 6...Rinse, 7...
Platen glass, 8... Static elimination LED array, 9
... Cleaning device, 11 ... Pressure roller, 12 ... Transfer charger, 13 ... Registration roller, 15 ... Development device, 16 ...
・Main charger, 18... Heater, 19.
...Fixing roller, 21...Feed roller, 21P...Pickup roller, 22...
... Friction pad, 24.25 ... Conveyance guide, 26 ... Document holding part, 31 ...
・Document feed sensor, 32... Leading edge detection sensor, 3
3...Registration sensor, 34...Seam sensor, 41...Photoconductor, 46, 47...
・Kite board, 51... Operation section, 52...
・Cassette, 61... Manual feed table, 62・
...Side guide, 63...Toner replacement lid, 101...Front cover 102.103...
...Side cover, 104...Back cover,
105...Louver, 107...Bottom cover 108...Top surface, 109...Fixing device, 1
10...Cleaning roller, 111...
Cooling device, 115...Cassette guide, 307
...Main motor, 3■0...Power transformer, 311...DC power supply, 312...
・Power back transformer, 314...Relay board, 3
18... Main PCB, L... Transport path, Ls... Branch transport path. Figure 1 l Figure 3 Figure 5WA 1 tJG Figure jI4 Figure 7 Figure 9 Figure 11FIA

Claims (2)

[Claims] (1) Image formation in which a case is equipped with a plurality of process units that operate in each process of image formation, and by operating these process units, an image of a document is transferred to transfer paper that is conveyed within the case. In the apparatus, a document conveyance path is formed in the case in a vertical direction, and a document conveyance roller and a document reading section of the process unit are arranged along the document conveyance path. Forming device. (2) Image formation in which a case includes a plurality of process units that operate in each process of image formation, and by operating each of these process units, an image of a document is transferred to a transfer paper conveyed within the case. In the apparatus, a document conveyance path is formed in the case in a vertical direction, a document conveyance roller having a switchback means for the document along the document conveyance path, and a sensor for detecting the image density and size of the document. What is claimed is: 1. An image forming apparatus comprising: a unit; and a document reading section of the process unit that forms an image according to a detection result by the sensor unit.