JPH06110283A - Image forming device - Google Patents

Abstract

(57) [Abstract] [Purpose] By recognizing the paper size during manual paper feeding, it is possible to perform image forming operations within the area corresponding to the paper size, eliminating waste of toner, and eliminating photoreceptor and clear -Reduce the load on the training device. In addition, even when manually feeding paper, the functions are improved by implementing various additional functions. [Structure] In the manual paper feed mode, a paper size selection key 8c for inputting a paper size is provided to the control device 101. As a result, the paper size is recognized even in the manual paper feed mode, the image forming operation can be performed in the area corresponding to the paper size, and various additional functions can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an image forming apparatus for manually feeding paper from a manual feed tray.

[0002]

2. Description of the Related Art In a conventional copying machine or the like, an automatic paper feed mode for automatically feeding paper in a paper feed cassette device can automatically recognize the size of the paper to be fed. Each image forming means carries out image forming operations such as charging, exposure, and development within a region corresponding to the size of paper. However, even in the same device, in the manual feed mode in which a manual feed tray is used to manually feed arbitrary paper from the outside of the main body of the device, the main body of the device cannot recognize the paper size. In the paper feed mode, full-scale image formation operations such as charging, exposure, and development are always performed according to the maximum paper size so that images can be formed on the maximum paper size. It was

[0003]

In a conventional copying machine or the like, the size of the fed paper cannot be recognized when manually feeding the paper, and a full-scale image forming operation is always performed.

Therefore, at the time of exposure, the full scale of the document table is always exposed and scanned regardless of the paper size and the document size, and if a small document is continuously copied, the copy time is longer than necessary. Since the exposure scanning is performed even after passing the trailing edge of the original while the high speed operation is obstructed, for example, when copying is performed with the original cover open, the exposure of the photoconductor is performed even after passing the trailing edge of the original. And the unnecessary fatigue to the photosensitive member, and an extra toner is attached to the exposed portion during development, the toner is consumed unnecessarily, the economical efficiency is impaired, and further, the clear There is a problem that the load on the training device is also increased and the life of the device is shortened.

Since the paper size cannot be recognized at the time of image formation, various auto-functions such as automatic magnification selection function and automatic double-sided copy function, or various editing functions such as frame erasing and margin shift are implemented. Even though it is not a high-performance model, there is a problem that various additional functions cannot be used in the manual paper feeding mode. Therefore, the present invention is not limited to the manual paper feeding mode. By recognizing the size of the paper to be supplied, the image forming operation is performed within the area corresponding to the paper size, the copy speed is increased and the toner is prevented from being wasted. The purpose is to extend the life of the cleaning device. Furthermore, it is possible to implement various additional functions in the manual paper feeding mode, improve the functions, and expand the applications.

[0006]

In order to solve the above problems, the present invention provides an apparatus main body having an image forming means for transferring an image formed on an image carrier to a sheet at a transfer position, and a plurality of sheets. Paper storage means for storing the paper, paper feed means for taking the paper out of the paper storage means and conveying the paper in the transfer position direction, and a manual paper feed table for placing the paper manually fed from the outside of the apparatus main body. , A manual paper feeding means for conveying the paper placed on the manual paper feeding table in the transfer position direction, and a mode for feeding the paper from the manual paper feeding means to the apparatus main body from the manual paper feeding means. Mode switching means for switching to the mode to be performed, and manual paper feed size supplied from the manual paper feeding means when the mode for feeding paper from the manual paper feeding means is selected by the mode switching means Input means for inputting information about,
A control unit for controlling the image forming unit to operate in accordance with the size of the manually fed sheet input from the input unit is provided.

In order to solve the above problems, the present invention has a main body of an apparatus having an image forming means for transferring an image formed on an image carrier to a sheet at a transfer position, and a sheet containing a plurality of sheets. Storage means, paper feed means for taking out the paper from the paper storage means and conveying the paper in the transfer position direction, manual paper feed table for placing paper manually fed from the outside of the apparatus main body, and this manual paper feed A manual sheet feeding unit that conveys a sheet placed on a table in the transfer position direction, a detecting unit that detects that the sheet is placed on the manual sheet feeding table, and a detecting unit that detects the sheet placed on the manual sheet feeding table. Mode switching means for switching the apparatus main body from a mode in which the paper is fed from the paper feeding means to a mode in which paper is fed from the manual paper feeding means while it is detected that the paper is placed, and a mode switching means. Exchange Inputting means for inputting information on the size of the manual paper fed from the manual paper feeding means when the mode for feeding paper from the manual paper feeding means is selected by the manual feeding paper; A control unit for controlling the image forming unit to operate in accordance with the size is provided.

Further, in order to solve the above problems, the present invention provides
An apparatus main body having an image forming means for transferring an image formed on an image carrier to a sheet at a transfer position, a sheet storing means for storing a plurality of sheets, a sheet taken out from the sheet storing means, and the transfer position Paper feeding means for feeding the paper in a direction, a manual paper feed tray for placing paper manually fed from the outside of the apparatus main body, and a paper for paper placed on the manual paper feed tray in the transfer position direction. A manual paper feeding means, a mode switching means for switching the apparatus main body from a mode for feeding paper from the paper feeding means to a mode for feeding paper by the manual paper feeding means, and the mode provided near the manual paper feeding table. Size detecting means for detecting the size of the paper placed on the manual paper feed tray when the mode for feeding paper by the manual paper feed means is selected by the switching means, and this size In which in response to the size of the manually fed sheet which is detected from the knowledge means providing a control means for controlling to operate the image forming unit.

[0009]

The present invention is constructed as described above and has a manual feed mode.
By inputting the information about the paper size when the paper is fed, the image forming means can perform the image forming process in the area corresponding to the size of the paper, and thus the charging, the exposure, the development, etc. in the extra area. The image forming operation is not performed, the image forming time is shortened, the developer is saved, and the life of the cleaning device is extended.

Further, since the size of the paper to be supplied is recognized, various additional functions such as an auto function and an editing function can be executed even in the manual paper feeding mode, and the functions are substantially expanded. It

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows the image forming apparatus 100 as a whole, including image forming means 2, an automatic double-sided device 4, and a large-capacity cassette device 5.
And the like, an automatic document feeder 6 for automatically feeding a document to a document platen 30 formed of a glass plate on the upper surface of the device body 1, and first to third sheet feeding cassettes as sheet storing means. The sheet feeding unit 7 is configured to support the devices 7a to 7c in a removable manner.

A drum-shaped photoconductor 10 is provided in a substantially central portion of the apparatus main body 1, and an exposure having a charging device 11 and a lens 12b is sequentially provided around the photoconductor 10 along the rotation direction thereof. Exposure unit 12a of developing device 12, developing device 13, transfer peeling charger 14, cleaning device 1
6, a charge eliminating device 17 is provided to constitute the image forming means 2.

On the right side of the apparatus main body 1, the side cassette 18 and the large-capacity cassette device 5 which are sheet storage means are attached, and above the side cassette 18, a manual feed tray 18a which is a manual sheet feeding means is provided. ing. On the other hand, the paper feed unit 7 is a paper storage means and stores the paper P of an arbitrary size.
7c is attached. Further, below the photoconductor 10 of the apparatus main body 1, a sheet stacking unit 4a of the automatic double-sided device 4 which is a sheet storage unit is provided.

From the paper feed cassette device for supplying the paper P to the transfer position 10a, which is the paper conveyance start position facing the transfer / separation charger 14 on the photoconductor 10, the first to the third transfer rollers are provided. The sixth transport paths 33a to 33f are formed. A transport means is provided on each of the transport paths 33a to 33f, and includes a side cassette device 18, a large-capacity cassette device 5, first to third paper feed cassette devices 7a to 7c,
First to sixth sheets P that take out the respective sheets P from the sheet stacking unit 4a
Pickup rollers 34a to 34f, first to sixth separation and conveyance rollers 36a to 36f for separating and conveying the taken-out paper P, and first to third conveyance transmission rollers 3
7a to 37c are provided.

While the first pickup roller 34a of the manual feed tray 18a reaches the first separating / conveying roller 36a, the apparatus main body 1 is automatically fed from the manual feed mode. In addition to the mode changeover switch, the micro switch 18b is provided as a detection means for detecting whether or not the paper P is supplied to the manual feed tray 18a.

Further, the paper P conveyed by any of the first to sixth separation / conveyance rollers 36a to 36f in the apparatus main body 1 is provided on the left side of the apparatus main body 1 via the photoconductor 10. A main transport path 22 leading to the paper tray 9 is formed.

A registration roller 24 is arranged on the upstream side of the photoconductor 10 in the main transport path 22, and a transport belt 26, a pair of fixing rollers 27, and a transport roller 1 are located on the downstream side.
9, a sheet discharge roller 28, and a gate 29 for guiding the sheet P to either the sheet discharge roller 28 side or the automatic duplexer 4 side.
Are arranged.

An operation panel 8 is provided on the upper surface of the apparatus main body 1, and a copy key 8a for instructing the start of a copy operation and a numeric keypad 8b for setting the number of copies are provided on the operation panel 8. , An information input means and a specification means such as a paper size selection key 8c, a density adjustment key 8d, a magnification key 8e, a document size key 8f, an automatic magnification selection key 81 for setting an auto function, an automatic both sides When the selection key 82 and the editing function are set, the margin key 83, the editing key 84, and the frame erasing key 8
An input key 80a including 6 and the like, a display panel 8j for displaying a paper jam, a paper out, etc., a message panel 8k for displaying a message including a copy number, a copy magnification and a skew display of the original D. , And the like are provided.

The automatic document feeder 6 includes a document tray 60.
From pickup roller 61a, judgment roller 61b,
The document D conveyed through the aligning roller 61c is
It is supplied onto the original table 30 by a conveyor belt 63 which is stretched between the belt rollers 62, and after the copying is completed, the conveyor belt 63.
The sheet is discharged to the sheet discharge section 68 side via the reversing roller 64a and the sheet discharge roller 64b. Reference numeral 31 is a document stopper.

FIG. 4 is a block diagram showing a control system, which is a control device 101 for controlling the entire image forming apparatus 100 such as the apparatus main body 1, the automatic document feeder 6, the large-capacity cassette device 5, and the paper feeding unit 7. Is the input interface 102
Input keys 80 such as a copy key 8a, a paper size selection key 8c, and an automatic magnification selection key 81 on the operation panel 8 via the
Signals are input from various switches / sensors 103 and the like for detecting the sheet P in the main transport path 22, the feed timing, the toner density, and the like such as a and the micro switch 18b. On the other hand, the control device 101, via the output interface 104, the photoconductor 10 of the device main body 1,
The developing device 13 or the exposure device 12, the image forming means 2 such as the conveyor belt 26, the motor driver 107 for driving the various motors 106 such as the paper feeding unit 7, and the display portion 80b on the operation panel 8 are connected. It is being controlled.

Further, a document feeding control device 111 for controlling the automatic document feeding device 6 is connected to the control device 101 via a first interface 108. A signal from a document switch / sensor 112 for detecting the feed timing and size of the document D is input to the document feeding control device 111, and the pickup roller 61a and the conveyor belt 63 are input.
For example, a motor driver 114 for driving each motor 113 of the automatic document feeder 6, a solenoid for driving the flapper 67, and other driving devices 115 are controlled.

Next, the operation will be described. First, in the automatic paper feed mode, the paper feed unit 7 or the large capacity feed
When a copy is automatically performed on a sheet automatically fed from any one of the sheet storage means in the image forming apparatus 100 such as the printer 5, the operator operates the numeric keypad 8 on the operation panel 8 at the start of the copy.
b, the paper size selection key 8c, the document size key 8f, and the input key 80a such as the automatic magnification selection key 81 are used to input necessary image forming conditions, and the original document is input to the document tray 60 of the automatic document feeder 6 together with the input image forming conditions. Set D and copy key-8
Turn on a and start copying.

Thus, for example, the automatic magnification selection key 81
Is input, the image forming means 2 automatically selects the copy magnification, and the lens 12 of the exposure device 12 is selected.
The movement is adjusted so that b becomes a predetermined copy magnification. On the other hand, if the automatic double-sided selection key 82 has been input, the drive is started after the gate 29 is set to be opened to the automatic double-sided device 4 side. Along with these, the automatic document feeder 6, the paper feeding unit 7, etc. are also driven, and in the automatic document feeder 6, the uppermost document D taken out by the pickup roller 61a is the sorting roller. It is sent to the conveyor belt 63 via 61b and an aligning roller 61c. Next, the document D is transported onto the document table 30 by the transport belt 63 rotated in the direction of arrow x, and after being transported by a predetermined amount,
It is retracted by the conveyor belt 63 which is rotated in the reverse direction, its rear end is brought into contact with the document stopper 31, and is stopped at the document reading position. At the same time, the conveyor belt 63 is also temporarily stopped.

On the other hand, in the apparatus main body 1, the image forming operation is started, and the photoconductor 10 follows the rotation thereof to sequentially perform the steps of charging, exposing, and developing by the image forming means 2 in regions corresponding to the sheet size. After that, a toner image is formed on the surface, and the transfer peeling charger 14 is reached.

In synchronization with this, the first to third paper feeding cassette devices 7a to 7 are also driven according to the designated paper size.
c, side cassette 18 or large capacity cassette device 5
The paper P supplied from any one of the above is sent to the transfer position 10a between the photoconductor 10 and the transfer peeling charger 14 at the timing when the leading edge of the toner image on the photoconductor 10 is aligned with the toner image on the photoconductor 10. The toner image of is transferred. After that, the sheet on which the toner image is transferred is peeled from the photoconductor 10, conveyed by the conveying belt 26, and sent to the fixing roller 27 to fix the image. Paper output roller 2
The sheets are stacked on the sheet discharge tray 9 by the unit 8. In the case of a double-sided copy, after completion of fixing, it is conveyed to the automatic double-sided device 4 side by the gate and accumulated in the sheet accumulating section 4a.

After the transfer is completed, the photoconductor 10 is made ready for the next copy through the cleaning device 16 and the static eliminator 17, and the copying operation by the image forming means is repeated until the required number of copies is reached. Become.

During the image forming operation by the image forming means 2 as described above, when the exposure operation by the exposure device 12 is completed and the document reading is completed, the automatic document feeding device 6
The conveyor belt 63 is rotated again in the direction of arrow x, and the document D
Is taken out from the document table 30 to the reverse roller 64a side,
When the back side is read, it is returned to the conveyor belt 63 side again, while when the reading is finished, the paper discharge roller 6
After passing 4b, the sheet is discharged to the sheet discharge section 68 side, and the next document can be fed.

Next, the case of manually feeding paper from the manual feed tray 18a will be described. In this manual feed,
When the paper P is set on the manual feed tray 18a, the micro switch 18b is turned on, and the control device 101 detects that the paper P is on the manual feed tray 18a, and the apparatus main body 1
To manual feed mode. However, even in the manual paper feed mode, the paper size can be designated by the paper size selection key 8c, and various additional functions such as an auto function and an editing function can be executed. .

Therefore, the number of copies from the operation panel 8
At the same time as setting image forming conditions such as image density, the operator designates the size of the paper P to be manually fed by the paper size selection key 8c, and if necessary, various types are selected from the automatic magnification selection key 81 or the like. Select an additional function. At the same time, the document D is set on the document tray 60 of the automatic document feeder 6, and the copy key 8a is turned on to start copying.

As a result, in the apparatus main body 1, for example, in the same manner as in the automatic paper feed mode, for example, the automatic magnification selection key is selected.
If 81 is input, the automatic magnification selection function is performed under the control of the control device 101 according to the first flow chart shown in FIG. 5, that is, the manual feed with the micro switch 18b turned on. In the mode, the control device 101
In step 116, it is compared whether or not the automatic magnification selection key 81 is turned on, and if it is not turned on, the exposure operation is awaited without performing the automatic magnification conversion operation. On the other hand, if the automatic magnification selection key 81 is turned on in step 116, the process proceeds to step 117, and the paper size selection key 8c is turned on, and it is compared whether or not the paper size is designated.

If the paper size selection key 8c is turned on, the flow advances to step 118 to set the copy magnification based on the original size and the paper size input to perform the automatic magnification conversion operation, and then the exposure device 12 Lens 12
b is moved and adjusted so as to have a predetermined copy magnification, and exposure scanning is awaited. If the paper size selection key 8c is not turned on in step 117, step 11
The process proceeds to step 9, and the message that automatic magnification conversion is impossible is displayed on the message panel 8k, and the process returns to step 116. Therefore, the operator cancels the automatic magnification selection key 81 and interrupts the automatic magnification conversion function, or re-designates a predetermined paper size by the paper size selection key 8c and executes the automatic magnification conversion operation. Becomes

Specifically, for example, if the document size is [A.
5], and if the [A.4] size transverse feed is specified as the paper size and the automatic magnification selection key 81 is turned on, the copy magnification 141 [%] is automatically set. The position of the lens 12b of the exposure apparatus 12 is moved and adjusted so that the copy magnification becomes 141 [%].

Further, for example, if the automatic double-sided selection key 82 is input, the automatic double-sided function is carried out by the control device 101 according to the second flow chart shown in FIG.

That is, the control device 101 compares in step 120 whether or not the automatic double-sided selection key 82 is turned on, and if it is not turned on, it is judged that the single-sided copy is made, and the gate 29 is selected. In the state in which the paper is opened to the side of the paper discharge roller 28b, the copy operation is awaited. On the other hand, step 1
If the automatic double-sided selection key 82 is turned on at 20, the process proceeds to step 121, where the paper size selection key 8c is turned on and it is compared whether or not the paper size is designated.

When the paper size selection key 8c is turned on, the routine proceeds to step 122, where the gate 29 is opened to the automatic double-sided device 4 side in order to perform the automatic double-sided copy operation.
Wait for copy operation. If the paper size selection key 8c is not turned on in step 121, step 12
In step 3, the message panel 8k indicates that automatic double-sided printing is not possible, and the process returns to step 120. Therefore, the operator cancels the automatic double-sided selection key 82, interrupts the automatic double-sided function, or re-specifies a predetermined paper size by the paper size selection key 8c to perform the automatic double-sided operation. .

In this way, the lens 12a and the gate 29 are
While the position adjustment and the like are performed, the document D is set on the document table 30 in the automatic document feeder 6.

Next, in the apparatus main body 1, the image forming operation is started by the control of the control unit 101, and the photoconductor 1
0 is sequentially charged by the image forming means 2 according to the rotation,
Each step of exposure and development is carried out, and a toner image is formed on the surface thereof. At this time, all steps of the image forming means 2 such as charging, exposure, development and conveyance of paper are performed in full scale. Instead of this, it is performed only in the area of the [A.4] size lateral feed specified by the paper size selection key 8c.

That is, the document scanning by the exposure device 12 is [A
.. 5] size area only scanned while photoconductor 10
On the upper side, only the [A.4] size traverse area is subjected to the steps of charging, exposing and developing, and the toner image is formed on the [A.4] size traverse area of the photoreceptor surface. Formed,
The transfer peeling charger 14 is reached.

In synchronization with this, the [A.4] size paper P is fed laterally from the manual feed tray 18a to the transfer position 10a.
And the toner image on the photoconductor 10 is transferred. After that, the sheet on which the toner image is transferred is peeled from the photoconductor 10, conveyed by the conveyance belt 26, and sent to the fixing roller 27 to fix the image. The sheets are stacked on the sheet discharge tray 9 by the sheet discharge roller 28b.
In the case of a double-sided copy, after completion of fixing, it is conveyed to the automatic double-sided device 4 side by the gate and accumulated in the sheet accumulating section 4a.

On the other hand, after the transfer is completed, the photoconductor 10 is made ready for the next copy through the cleaning device 16 and the static eliminator 17, and the copying operation by the image forming means is repeated until the required number of copies is reached. Become.

During the image forming operation by the image forming means 2 as described above, when the document scanning by the exposure device 12 is completed and the document reading is completed, the automatic document feeding device 6
The conveyor belt 63 is rotated again in the direction of arrow x, and the document D
Is taken out from the document table 30 to the reverse roller 64a side,
When the back side is read, it is returned to the conveyor belt 63 side again, while when the reading is finished, the paper discharge roller 6
After passing 4b, the sheet is discharged to the sheet discharge section 68 side, and the next document can be fed.

With this configuration, the paper size is recognized by the input from the paper size selection key 8c in the manual paper feed mode.

Therefore, each image forming means 2 during copy operation
Can perform the operation within the area according to the paper size without performing the full scale of the copy operation, the copy time can be shortened, and the extra toner consumption and the photoconductor and It is possible to prevent an increase in load on the cleaning device. Further, the auto function and the editing function which can be executed only in the automatic paper feeding mode in the past can be executed also in the manual paper feeding mode, and the functions are substantially expanded. Next, a second embodiment of the present invention will be described with reference to FIGS.

In the second embodiment, the paper size is specified by inputting the paper size from the paper size selection key 8c in the first embodiment, whereas the paper size is detected by the detecting means and the detection result is shown. Since it is the same as the first embodiment except that it is input to the control device 101, the same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the side guide 72 of the manual feed tray 71 is provided with a size reading device 73 as a detection means, and further, a paper presence / absence detection switch 74 is provided at the rear end of the manual feed tray 71.

That is, the variable resistor 73a of the size reading device 73 is provided on the rear surface of the manual feed tray 71, and one side guide 72a is slidably contacted with the variable resistor 73a. The variable resistor 73a is connected to the control device 101 via the A / D conversion circuit 73b,
The paper size in the width direction is input to the control device 101 as a potential difference of the variable resistor 73 which varies depending on the position of the side guide 72a. At the same time, the detection result from the paper presence / absence detection switch 74 is input to the control device 101, and the paper size and the feeding direction are determined by the detection result from the size reading device 73 and the detection result from the paper presence / absence detection switch 74. It will be input to 101.

That is, the detection result in the width direction is [A.
4] If the paper size detection switch 74 is in the vertical state and the paper presence detection switch 74 is in the OFF state, the paper size is detected as [A5] size horizontal feed, while if the paper presence detection switch 74 is in the ON state, the paper size is detected. Will be detected as [A.4] size vertical feed.

Next, the operation will be described. In manual paper feeding, when the paper P is placed on the manual paper feed tray 71, the side guide 72 is slid to fit its width, and then the paper P is set on the manual paper feed tray 71. 101 detects that there is a sheet of paper P on the manual feed tray 71, and switches the apparatus main body 1 to the manual feed mode.

As a result, inputs can be made from the size reading device 73 and the paper presence / absence detection switch 74, and the control device 101 recognizes the paper P size from the detected widthwise size and lengthwise lengthwise result of the paper P. Will be done. Then, the image forming conditions such as the number of copies and the image density are set on the operation panel 8, and if necessary, various functions are selected from the automatic magnification selection key 81 or the like. At the same time, the document D is set on the document tray 60 of the automatic document feeder 6, and the copy key 8a is turned on to start copying.

As a result, in the apparatus main body 1, if the automatic magnification selection key 81 is turned on, the control apparatus 101 sets the copy magnification based on the original size and the paper size, and the lens 12b of the exposure apparatus 12 is set. The movement is adjusted so as to obtain a predetermined copy magnification, and exposure scanning is waited.

Then, similarly to the first embodiment, the image forming process by the image forming means 2 is carried out only in the area corresponding to the paper size obtained from the detection result, and the copy image is obtained.

According to this structure, in the manual feed mode, the paper size is automatically recognized only by placing the paper P on the manual feed tray 71 and setting it at the paper feed position. Therefore, there is no particular key operation for recognizing the paper size, and in the manual paper feed mode, the image forming process can be performed in the area corresponding to the paper size, resulting in unnecessary toner consumption, It is possible to prevent deterioration of the cleaning device.

Further, an auto function and an editing function can be implemented, and the substantial function expansion in the manual paper feeding mode can be achieved.

The present invention is not limited to the above embodiment, and can be changed within the scope of the invention. For example, the specifying means for specifying the paper size is an input key dedicated to manual paper feeding. -Is provided or "HELP"
Press the keys one after another to move the message panel 8k to A4 → A4.
The sheet size may be displayed in the order of R → B4 → A3 and the corresponding size may be displayed so that the size can be selected. Further, the detection means for detecting the paper size on the manual feed tray for recognizing the paper size may be provided with a plurality of micro switches which are switched by the slide of the side guides at positions corresponding to the respective paper sizes on the back surface of the manual feed tray. .

Also, various functions such as an auto function are not limited.

[0057]

As described above, according to the present invention, by recognizing the size of the paper to be fed even in the manual paper feeding, the paper can be formed without performing the image forming operation over the full scale unlike the prior art. It can be done within the area according to the size. Therefore, the image forming speed can be increased and extra toner is consumed as in the prior art, and an extra load is applied to the cleaning device for cleaning the extra toner on the photoconductor. Does not occur, the load on the photoconductor is reduced, and it is possible to improve economic efficiency and prolong the life of the apparatus.

Further, since the paper size is not specified in the past, it is possible to perform various additional functions which cannot be performed in the manual paper feeding, the function in the manual paper feeding is improved, and its application is expanded. It will be possible.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram illustrating an image forming apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic view showing the image forming apparatus according to the first embodiment of the present invention.

FIG. 3 is a plan view showing an operation panel according to the first embodiment of the present invention.

FIG. 4 is a block diagram showing a control system of a first embodiment of the present invention.

FIG. 5 is a flow chart showing an automatic magnification conversion operation in a manual paper feed mode according to the first embodiment of the present invention.

FIG. 6 is a flowchart showing an automatic double-sided operation in the manual paper feed mode according to the first embodiment of the present invention.

FIG. 7 is a plan view showing a manual feed tray according to a second embodiment of the present invention.

FIG. 8 is a block diagram showing a control system of a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Device main body 2 ... Image forming means 8c ... Paper size selection key 18a ... Manual feed tray 100 ... Image forming device 101 ... Control device

Claims (3)

[Claims] 1. An apparatus main body having an image forming means for transferring an image formed on an image carrier to a sheet at a transfer position, a sheet storing means for storing a plurality of sheets, and a sheet from the sheet storing means. And a paper feed means for feeding the paper in the transfer position direction, a manual paper feed tray for placing a paper manually fed from the outside of the apparatus main body, and a paper for paper placed on the manual paper feed tray as the transfer paper. A manual paper feeding means for carrying the paper in the position direction; a mode switching means for switching the apparatus main body from a mode for feeding paper from the paper feeding means to a mode for feeding paper by the manual paper feeding means; An input unit for inputting information relating to the size of the manual paper fed from the manual paper feed unit when the mode for feeding paper by the manual paper feed unit is selected; An image forming apparatus comprising: a control unit that controls the image forming unit to operate in accordance with an input manual paper size. 2. An apparatus main body having an image forming means for transferring an image formed on an image carrier onto a sheet at a transfer position, a sheet storing means for storing a plurality of sheets, and a sheet from the sheet storing means. And a paper feed means for feeding the paper in the transfer position direction, a manual paper feed tray for placing a paper manually fed from the outside of the apparatus main body, and a paper for paper placed on the manual paper feed tray as the transfer paper. A manual sheet feeding unit that conveys the sheet in the position direction, a detection unit that detects that a sheet is placed on the manual sheet feeding table, and a detection unit that detects that the sheet is placed on the manual sheet feeding table. During this period, the apparatus body is switched from a mode in which the paper is fed from the paper feeding means to a mode in which the paper is fed from the manual paper feeding means, and this mode switching means feeds paper from the manual paper feeding means. Input means for inputting information regarding the manual paper size supplied from the manual paper feeding means when the paper feeding mode is selected, and the image forming means corresponding to the manual paper size input by the input means. An image forming apparatus comprising: a control unit that controls to operate the image forming apparatus. 3. An apparatus main body having an image forming means for transferring an image formed on an image carrier onto a sheet at a transfer position, a sheet storing means for storing a plurality of sheets, and a sheet from the sheet storing means. And a paper feed means for feeding the paper in the transfer position direction, a manual paper feed tray for placing a paper manually fed from the outside of the apparatus main body, and a paper for paper placed on the manual paper feed tray as the transfer paper. A manual sheet feeding means for conveying in the position direction; a mode switching means for switching the apparatus main body from a mode for feeding paper from the sheet feeding means to a mode for feeding paper by the manual sheet feeding means; And a size detection means for detecting the size of the paper placed on the manual paper feed table when a mode for feeding paper from the manual paper feed means is selected by the mode switching means. An image forming apparatus comprising: a control unit that controls the image forming unit to operate in accordance with the size of the manual feed sheet detected by the size detecting unit.