JPH0656356A - Image former - Google Patents

Abstract

PURPOSE:To shorten a span of first copying time by quickening the control timing of a paper width regulating plate in an intermediate tray. CONSTITUTION:Each of first, second and third optical sensors 1001, 1002 and 1003 for detecting each copy size are set up on a document mount of an automatic document feeder (RDF) 200. With the copy size and an image multiplying factor detected by these optical sensors 1001, 1002 and 1003, a central processing unit 1005 selects a sheet size subject to paper feeding and, according to the sheet size, it is made so as to shift and control two paper width regulating plates 1011, 1011 of an intermediate tray 300.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, a printer and a facsimile, and more specifically, an automatic document feeder for feeding an original to a predetermined position of the main body of the image forming apparatus. The present invention relates to an image forming apparatus including an intermediate tray for re-feeding a sheet material on which an image has been formed once inside the image forming apparatus main body.

[0002]

2. Description of the Related Art An image forming apparatus such as a copying machine, a printer or a facsimile has an automatic document feeder for feeding a document to a predetermined position of the image forming apparatus main body and an image forming apparatus once in the main body of the image forming apparatus. Some include an intermediate tray for re-feeding the formed sheet material.

In such an image forming apparatus, when an image is formed in a mode in which the intermediate tray is used, the paper width regulating plate (sheet material width direction regulating means) provided in the intermediate tray feeds the paper. The position of the sheet material in the width direction is regulated.

Further, such an image forming apparatus has an automatic paper selection mode (APS mode) in which the size of the sheet material to be fed is determined from the original size and the image magnification, and in the APS mode, the CPU ( When the sheet material size is determined, the control means) controls the position of the sheet width regulation plate of the intermediate tray according to the sheet material size.

In the APS mode of the conventional image forming apparatus, when the copy start button is pressed and the original is fed from the automatic original feeder to the original plate of the main body of the image forming apparatus, the automatic original feeder or the original The document size detection sensor installed on the table detects the document size. At this point, the CPU determines the sheet material size based on the document size detected by the document detection sensor and the image magnification set by the image magnification setting means, and controls the sheet width regulation plate. After this,
The image forming operation is started.

[0006]

However, in the above prior art, when a document is fed from the automatic document feeder to the document table, the size of the document detected by the automatic document feeder or the document table is detected. Since the original size is detected by the sensor, it takes time to determine the size of the sheet material to be fed, and it will be 1 after the copy start button is pressed.
This has been a cause of prolonging the time (first copy time) until the first sheet material is discharged.

Therefore, the present invention has been made in view of the above circumstances, and provides an image forming apparatus in which the time to determine the size of a sheet material to be fed is short and the first copy time is not long. The purpose is.

[0008]

According to the present invention, an automatic document feeder (200) for feeding a document to a predetermined position of an image forming apparatus body (100), and the image forming apparatus body (1).
00), an intermediate tray (300) for re-feeding the sheet material (S) on which an image has been formed,
Sheet material width direction regulating means (101) for aligning the width direction positions of the sheet material (S) in the intermediate tray (300).
1) and an image forming apparatus including.

In order to achieve the above object, the present invention is directed to a document table (2) of the automatic document feeder (200).
01) document size detecting means (1001, 1002, 1003) for detecting the size of the document placed on the intermediate tray (3).
No. 00) before the image forming operation is started in the image forming mode.
002, 1003) selects the sheet material size to be fed according to the document size detected, and the sheet material width direction regulating means (10) according to the sheet material size.
It is characterized in that the set position of 11) is controlled.

[0010]

According to the above construction, the automatic document feeder (20
When an original is placed on the original placing table (201) of (0), the original size detecting means (1001, 1002, 1003) detects the original size. Therefore, the size of the sheet material to be fed at this point can be determined, and the sheet material width direction regulating means (101
1) can be controlled.

Thus, the control of the sheet material width direction regulating means (1011) can be completed before pressing the copy start button, and as a result, the first copy time is shortened.

The reference numerals in parentheses refer to the drawings and do not limit the structure of the present invention.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. <Embodiment 1> First, the configuration of a control circuit that best represents the features of the present invention will be described with reference to FIG.

Inputs to the first optical sensor 1001, the second optical sensor 1002, and the third optical sensor 1003 are I / Os 10.
The state of the document placing table of the automatic document feeder (RDF) 200 is notified to the CPU 1005 via 04.

The CPU 1005 is an optical sensor 1001, 10
When there is a response to 02, 1003, the sensor turns ON / OF
The F state is compared with the document width size data stored in the ROM 1008 to detect the width of the document placed on the document table.

Further, the CPU 1005 displays information on key depressions on the operation unit 1006 at the I / O 100 at an arbitrary timing.
4 and when it is detected that the key is pressed, the data of the set copy mode is stored in the RAM 1009.
In the ROM 1008 and RAM, the appropriate display data corresponding to the key pressed down on the LCD 1007 at the same time is stored in
1009, and outputs via I / O 1004.

Similarly, the magnification can be set from the operation unit 1006, and the input is made from the ten keys, the fixed variable magnification key, the same magnification key, the zoom key and the like on the operation unit 1006. further,
The paper type or APS mode can be selected by the paper selection key.

When APS mode is selected, CP
The U1005 calculates a new position from the input data of the document width and the magnification, compares it with the current position stored in the RAM1009, and compares the sheet width regulating plate 1011 of the intermediate tray.
When it is necessary to move the sheet from the current position to the new position, the CPU 1005 sends a drive pulse to the stepping motor 1010 via the I / O 1004 to move the sheet width regulating plate 1011 to the target position.

Next, the structure of a copying machine (image forming apparatus) to which the present invention is applied will be described.

FIG. 1 shows the overall construction of the copying machine, which is designated by reference numeral 10.
Reference numeral 0 is a main body of the copying machine, reference numeral 200 is a circulation type automatic document feeder (RDF) that automatically feeds documents, and reference numeral 400 is a sorting device (sorter).
00 can be freely used in combination with the copying machine main body 100. A. Configuration of Copying Machine Main Body (See FIG. 1) In FIG. 1, reference numeral 101 denotes a document table glass as a document table. Reference numeral 102 denotes an optical system as an image reading means, which is an original illumination lamp (exposure lamp) 10
2A, a scanning mirror 102B, a lens 102C, a motor 102D, and the like. The original is illuminated by the exposure lamp 102A while being scanned by the motor 102D, and the reflected light from the original is scanned by the scanning mirror 102B and the lens 102C.
To irradiate the photoconductor drum 105.

Around the photosensitive drum 105, a high voltage unit 106, a blank exposure unit 107, a potential sensor 108, a developing device 109, a transfer charger 110,
A separation charger 111 and a cleaning device 112 are provided, and the photosensitive drum 105 and the like constitute an image recording unit.

The photosensitive drum 105 is a main motor 113.
Is rotated in the direction of the arrow (clockwise) by the high-voltage unit 106 and is corona-charged.
When the reflected light of the document is emitted from 02, an electrostatic latent image is formed. This electrostatic latent image is developed by the developing device 109 and visualized as a toner image.

On the other hand, from the upper cassette 114 or the lower cassette 115 through the pickup rollers 116 and 117, the paper feed roller pairs 118 and 119 are used to form the main body 1 of the copying machine.
The sheet material S sent to the inside of 00 is the registration roller pair 12
After the timing is set so that the leading edge of the toner image and the leading edge of the sheet material S coincide with each other by 0, the photosensitive drum 105
The toner image is transferred by the transfer charger 110.

After this transfer, the sheet material S is separated by the charger 11.
It is separated from the photoconductor drum 105 by 1, is guided to the fixing device 122 by the conveying belt 121, is fixed by pressing and heating, and is then discharged to the outside of the copying machine main body 100 by the discharge roller pair 123.

The surface of the photosensitive drum 105 is cleaned by the cleaning device 112.

The copying machine main body 100 includes a cassette 114,
In addition to 115, a deck 124 capable of stacking, for example, 4000 sheet materials S is provided. The lifter 125 of the deck 124 rises according to the amount of the sheet material S so that the sheet material S always contacts the sheet feeding roller 126.

Reference numeral 127 is a paper discharge flapper, which switches the path between the double-sided copy side or multiplex copy side and the discharge side (sorter 300). The sheet material S sent from the discharge roller 123 is switched to the double-sided copy side or the multiplex copy side by the discharge flapper 127.

Reference numeral 128 denotes a lower conveyance path, which reverses the sheet material S sent from the discharge roller 123 to a reverse path 129.
The sheet material S is turned over and guided to the intermediate tray 300.

Reference numeral 131 is a multiple flapper for switching the path between double-sided copying and multiplex copying. By tilting the flapper to the left, the sheet material S is guided directly to the lower conveying path 128 without passing through the reversing path 129.

Reference numeral 132 is a paper feed roller for feeding the sheet material S to the photosensitive drum 105 side through the path 133.

Reference numeral 134 is a discharge roller which is arranged in the vicinity of the downstream side of the paper discharge flapper 127 and discharges the sheet material S switched to the discharge side by the paper discharge flapper 127 to the outside of the machine.

At the time of double-sided copying or multiple copying, the discharge flapper 127 is raised and the copied sheet material S is turned upside down via the conveying paths 129 and 128, and the intermediate tray 3 is turned on.
Stored in 00. At this time, the multiple flapper 131 is tilted to the right for double-sided copying, and the multiple flapper 131 is tilted to the left for multiple copying.

At the next time of back side copying or multiple copying, the sheet materials S stored in the intermediate tray 300 are fed one by one from below to the nip portion of the registration roller pair 120 via the path 133 by the sheet feeding roller 132. Be guided.

When the sheet material S is reversed and discharged from the copying machine main body 100, the paper discharge flapper 127 is raised and
The flapper 131 is tilted to the right, and the copied sheet material S
Is conveyed to the side of the conveyance path 129, and the rear end of the sheet material S is the first
After passing through the feeding roller 140, the reversing roller 142 conveys the sheet material S to the second feeding roller 141 side, and the discharging roller pair 134 reverses the sheet material S and discharges it to the outside of the machine. B. Configuration of operation panel (operation unit) provided in the copying machine main body (see FIG. 2) In FIG. 2, reference numeral 601 is an asterisk (*) key, which allows the operator (user) to set the binding margin amount,
It is used in the setting mode such as size setting for erasing the original frame.

Reference numeral 627 is a cursor key, which is used when selecting a setting item in the setting mode.

Reference numeral 628 is an OK key, which is used to confirm the setting contents in the setting mode.

Reference numeral 606 is an all reset key,
Press to return to standard mode. Also, press this key when returning from the auto shutoff state to the standard mode.

Reference numeral 605 is a copy start key (copy start key), which is pressed to start copying.

Reference numeral 604 is a clear / stop key, which functions as a clear key during standby (standby) and as a stop key during copy recording. This clear key is also used to cancel the set number of copies. The stop key is pressed to interrupt continuous copying. After the copying at the time of pushing is completed, the copying operation is stopped.

Reference numeral 603 is a ten-key pad which is pressed to set the number of copies. Also used when setting the asterisk mode.

Reference numeral 619 is a memory key, which allows the user to register a mode that is frequently used. Here, four modes of M1 to M4 can be registered.

Reference numerals 611 and 612 are copy density keys, which are pressed when manually adjusting the copy density.

Reference numeral 613 is an AE key for automatically adjusting the copy density according to the density of the original, or A
Press to cancel E (automatic density adjustment) and switch the density adjustment to manual.

Reference numeral 607 is a copy paper selection key,
Pressed when selecting the upper cassette 114, the lower cassette 115, the paper deck 124, and the multi-manual feed 150.
Further, when a document is placed on the RDF 300, APS selection (automatic paper selection) can be performed with this key 607. When APS is selected, the optimum cassette for the size of the copied image is automatically selected.

Reference numeral 610 is a unity size key, which is pressed to make a unity size (actual size) copy. Reference numeral 616 denotes an automatic scaling key, which is pressed to automatically specify reduction / enlargement of the image of the document in accordance with the designated transfer paper size.

Reference numeral 626 denotes a double-sided key, which is pressed to make a double-sided copy from a single-sided original, a double-sided copy from a double-sided original, or a single-sided copy from a double-sided original.

Reference numeral 625 is a binding margin key, which can create a binding margin of a designated length on the left side of the sheet material S.

Reference numeral 624 is a photographic key, which is pressed when copying a photographic original.

Reference numeral 623 denotes a multiple key, which is pressed when an image is created (combined) from the two originals on the same surface of the sheet material S.

Reference numeral 620 is an original frame erasing key, which is pressed when the user erases the frame of a standard size original document, and at that time, the size of the original document is set by the asterisk key 601.

Reference numeral 621 denotes a sheet frame erasing key, which is pressed to erase the frame of the original in accordance with the copy paper size.

Reference numeral 629 is a cover mode setting key,
Used when creating front and back covers and inserting slip sheets.

Reference numeral 630 is a page continuous shooting key, which is used when the left and right sides of a spread book are continuously copied.

Reference numeral 614 denotes staple sort, sort,
A discharge method selection key for selecting a discharge method for a group. When the sheet material S after copying is connected to a staple sorter, the staple sort mode, the sort mode, the group mode is selected or the selection mode is canceled. You can

Reference numeral 631 is a reservation key, which is used when starting the setting of the copy mode for the reserved document placed on the reservation tray 210 and when canceling the reservation setting.

Reference numeral 632 is a reservation setting key, which is used as an enter key when the reservation mode is set.

Reference numeral 633 is a guide key, which is used when displaying explanations of functions corresponding to various keys on the message display.

Reference numeral 1007 is an LCD (liquid crystal) type message display for displaying information relating to copying, and displays characters and figures with 96 × 192 dots. For example, the number of copies set with the numeric keypad 603, the fixed size scaling keys 601, 608, the same size key 610, and the zoom key 61.
7, the copy magnification set by 618, the sheet material size selected by the paper selection key 607, a message indicating the state of the copying machine main body 100, a guide message indicating the operating procedure, and other setting contents of various modes are displayed.

Reference numeral 704 is an AE display, which lights up when AE (automatic density adjustment) is selected by the AE key 613.

Reference numeral 709 is a preheat indicator, which lights up in the preheat state.

When the RDF 300 is used in the standard mode, the number of copies is one, the density AE mode, automatic paper selection, normal size, single-sided copy to single-sided copy are set. R
One copy in standard mode when DF300 is not used,
The density is set to manual mode, normal size, single-sided original to single-sided copying. The difference between when the RDF 300 is used and when it is not used is determined by whether or not a document is set on the RDF 300. C. Configuration of Automatic Document Feeder (RDF) (See FIG. 3) In FIG. 3, reference numeral 201 denotes an original document table on which an original sheet to be copied is placed.

Reference numeral 202 denotes an original paper size control plate, which is manually adjusted to the width of the original to be copied to prevent deviation and skew of the original paper. Reference numeral 203 denotes an auxiliary document placing table, which is opened to the outside and used when placing a large document such as an A3 size document.

FIG. 4 shows the detailed structure of the document table 201. In the front part of the document table 201, a document is pulled in,
A cover 204 is provided to protect the discharging mechanism. Under the cover 204, first, second and third optical sensors (original size detecting means) 1001, 1002, 10 are provided.
03 is set in a direction orthogonal to the paper feeding direction.

The size of the original placed on the original placing table 201 is determined by a combination of the presence or absence of input from each of the optical sensors 1001, 1002 and 1003. D. Configuration of Intermediate Tray (see FIG. 5) In FIG. 5, reference numerals 1011 and 1011 are left and right width regulating plates that regulate the position of the sheet material S on the intermediate tray 300. The left and right sheet width regulating plates 1011 and 1011 are moved according to the sheet width by a sheet width regulating drive motor (stepping motor) 1010. Paper width regulation drive motor 1
010 is controlled by the CPU 1005.

Further, reference numeral 304 is a light blocking plate, which blocks the optical sensor 305 when the sheet width regulating plate 1011 is moved outward. The CPU 1005 controls the paper width regulation drive motor 1010 with the position where the light shield plate 304 shields the optical sensor 305 as a reference position for control.

Next, the flow of control in the copying machine of this embodiment will be described with reference to FIGS. 7, 8 and 9.

This control is based on the premise that the copying machine is not in the copying operation, and when the copy start button is pressed, another operation sequence is started.

When there is no key input and no original is placed on the original placing table 201 of the RDF 200, the copying machine is in an idle state (2000) having state changes such as sensor and key input. At this time, when a key input is detected from the operation unit 1006 (2001), a key input process (2
002) is performed.

In the key input process (2002), the input data is analyzed (2010), the area of the RAM 1009 is updated (2011), and the display of the LCD 1007 is changed (2012).

On the other hand, if the APS mode is selected (2
003), the optical sensors 1001, 100 of the RDF 200
2. If there is a detection input from 1003 (200
4), movement processing of the paper width regulation plates 1011 and 1011 (2
005) is performed.

In the process of moving the sheet width regulating plate (2005), the width (size) of the document is discriminated from the input data of the optical sensor (2013). Next, the set magnification data stored in the RAM 1009 is read (2014), the sheet material size most suitable for the product value of the document size and the magnification is selected, and the new positions of the paper width regulating plates 1011 and 1011 are calculated ( 20
15). At this time, when the position where the current sheet width regulation plate is present is different from the new position (2016), the sheet width regulation plate 1011
1011 is moved (2017).

On the other hand, when the APS mode is not selected, there is a key input (2001), and when there is a change in the selected paper size, the regulation plate moving processing (2005) sequence is performed.

<Embodiment 2> First, the configuration of a control circuit that best represents the features of the present invention will be described with reference to FIG.

Original paper size control plate 20 of RDF 200
The voltage that changes according to the resistance value of the variable resistor 1110 connected to 2 is converted into digital data by the A / D converter 1109 and notified to the CPU 1005 via the I / O 1004.

The CPU 1005 monitors the data from the A / D converter 1109 and refers to the comparison table between the digital data stored in the ROM 1008 and the document width size data to find the width of the document placed on the document table 201. To detect.

Further, the CPU 1005 displays the key depression information on the operation unit 1006 at the I / O 100 at an arbitrary timing.
4 and the key press is detected, the set copy mode data is transferred to the RAM 1009.
In the ROM 1008 and RAM, the appropriate display data corresponding to the key pressed down on the LCD 1007 at the same time is stored in
1009, and outputs via I / O 1004.

The magnification can be similarly set from the operation unit 1006, and the ten keys 603, the standard variable magnification keys 608 and 609, the normal magnification key 610, and the zoom key 6 on the operation unit 1006 can be similarly set.
Input from 17. Further, a paper type or APS mode can be selected by the paper selection key 607.

When APS mode is selected, CP
U1005 calculates a new position from the input data of the detected document width and magnification and compares it with the current position stored in the RAM1009, and the intermediate tray 300 sheet width regulating plate 101
When it is necessary to move 1, 1011 from the current position to a new position, the CPU 1005 sends a control signal to the motor drive control circuit 1106 via the I / O 1004, and the motor 1107 moves the sheet width regulating plates 1011 and 1011 to the target position. Moved and reached position is RAM1009
To store.

FIG. 10 shows the structure of the document table 201 of the RDF 200 in this embodiment.

When a document is placed on the document table 201 and the document sheet size regulating plate 202 is manually moved according to the document width, the resistance of the variable resistor 1110 connected to the document sheet size regulating plate 202 is changed. The value changes according to the document width.

Next, the control flow in the copying machine of the embodiment will be described with reference to FIG.

This control is based on the premise that the copying machine is not in the copying operation. When the copy start button is pressed, another operation sequence is started.

When there is no key input and no original is placed on the original placing table 201 of the RDF 200, the copying machine is in the idle state (2100) having state changes such as sensor and key input. At this time, when a key input is detected from the operation unit 1006 (2101), the key input processing (2002) shown in FIG. 8 is performed. At this time, if there is a change in the magnification or the paper selection mode (2104), the paper width regulation plate moving process (2005) shown in FIG. 9 is subsequently performed.

On the other hand, when the APS mode is selected (2
102), RDF 200 original paper size regulation plate 202
When the width data from (2103) has changed (2103), the paper width regulation plate moving process (2005) shown in FIG. 9 is performed.

On the other hand, when the APS mode is not selected (2002) and the paper size is determined, and the selected paper size is changed, the paper regulation plate moving process (2005) shown in FIG. 9 is executed. Do the sequence.

<Third Embodiment> First, the configuration of a control circuit that best represents the features of the present invention will be described with reference to FIG.

Original paper size control plate 20 of RDF 200
The voltage that changes according to the resistance value of the variable resistor 1110 connected to 2 is converted into digital data by the A / D converter 1109 and notified to the CPU 1005 via the I / O 1004. The CPU 1005 monitors the data from the A / D converter 1109 and refers to the comparison table between the digital data stored in the ROM 1008 and the document width size data to detect the width of the document placed on the document table 201. . Also,
The CPU 1005 fetches key press information on the operation unit 1006 via the I / O 1004 at an arbitrary timing, and when it detects that the key is pressed, it stores the set copy mode data in the RAM 1009 and at the same time. ROM the appropriate display data corresponding to the pressed key
1008 and RAM 1009, and I / O 100
Output via 4. Similarly, the magnification can be set from the operation unit 1006, and the numeric keypad 60 on the operation unit 1006 can be used.
3, standard variable magnification keys 608 and 609, equal magnification key 610, and zoom key 617. Further, a paper type or APS mode can be selected by the paper selection key 607.

Key input and original paper size regulation plate 202
CPU 1005 causes the timer 1203 to move the sheet width regulating plate 1011 of the intermediate tray 300 from the current position to a new position when the state changes due to the movement of.
To the stepping motor 1010 via the I / O 1004, the current position is maintained while the timer 1203 is counting, the current position is calculated again, and the drive signal is sent to the stepping motor 1010. 1011 is moved to the target position, and the reached position is stored in the RAM 1009.

Next, a control flow in the copying machine of this embodiment will be described with reference to FIG.

This control is based on the premise that the copying machine is not in the copying operation, and when the copy start button is pressed, another operation sequence is started.

When there is no key input and there is no change in the position of the document sheet size regulation plate 202 of the RDF 200, the copying machine is in the idle state (2200) having state changes such as sensor and key input. At this time, when a key input is detected from the operation unit 1006 (2201), the key input processing (2002) shown in FIG. 8 is performed. At this time, if there is a change in the magnification or the paper selection mode (2207), or R
When the width data from the original paper size regulation plate 202 of the DF 200 has changed (2203), a constant count value is set in the timer 1203 (2204), and after a lapse of a fixed time (2205), the RAM contents are referenced again to change the state. (22
06), the sequence of sheet regulation plate movement processing (2005) shown in FIG. 9 is performed.

[0092]

As described above, in the image forming apparatus of the present invention, the document size is detected on the document placing table of the automatic document feeder, and the sheet material size to be fed at this point is selected, and Since the sheet material width direction regulating means of the intermediate tray is controlled according to the sheet material size, the control of the sheet material width direction regulating means can be completed before pressing the copy start button, and the first copy time Can be shortened.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing the overall configuration of a copying machine (image forming apparatus) according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a configuration of an operation unit provided in the copying machine.

FIG. 3 is an external perspective view showing the configuration of an automatic document feeder provided in the copying machine.

FIG. 4 is a plan view showing a detailed configuration of a document table of the automatic document feeder.

FIG. 5 is a plan view showing a configuration of an intermediate tray portion of the copying machine.

FIG. 6 is a block diagram showing a configuration of a control circuit of the copying machine.

FIG. 7 is a flowchart showing a control operation of the copying machine.

FIG. 8 is a flowchart showing a subroutine of key input processing in the control operation.

FIG. 9 is a flowchart showing a subroutine of paper width regulation plate movement processing of the same control operation.

FIG. 10 is a partially cutaway plan view showing the configuration of a document placing table of the automatic document feeding device provided in the copying machine according to the second embodiment of the present invention.

FIG. 11 is a block diagram showing a configuration of a control circuit of the copying machine.

FIG. 12 is a flowchart showing a control operation of the copying machine.

FIG. 13 is a block diagram showing a configuration of a control circuit of a copying machine according to a third embodiment of the present invention.

FIG. 14 is a flowchart showing a control operation of the copying machine.

[Explanation of symbols]

100 copy machine main body (image forming apparatus main body) 200 automatic document feeder 201 original document placing table 300 intermediate tray 601 and 608 standard variable magnification key (image magnification setting means) 610 equal magnification key (image magnification setting means) 617 and 618 zoom keys (Image magnification setting means) 1001 First optical sensor (original size detecting means) 1002 Second optical sensor (original size detecting means) 1003 Third optical sensor (original size detecting means) 1005 CPU (control means) 1011 Paper Width regulation plate (sheet width direction regulating means) 1203 Timer (time measuring means) S Sheet material

Claims (3)

[Claims] 1. An automatic document feeder for feeding a document to a predetermined position of an image forming apparatus main body, and for re-feeding a sheet material on which an image has been formed once in the image forming apparatus main body. Of the intermediate tray and sheet material width direction regulating means for aligning the width direction positions of the sheet material in the intermediate tray, the image forming apparatus being mounted on a document table of the automatic document feeder. Providing a document size detection means for detecting the size of the placed document,
In the image forming mode using the intermediate tray, the control means selects the sheet material size to be fed according to the document size detected by the document size detecting means before the image forming operation is started, and the sheet material size is selected. An image forming apparatus, wherein a setting position of the sheet material width direction regulating means is controlled according to the above. 2. An image magnification setting means for setting a magnification of a formed image on a sheet material, and a paper feeding into the main body of the image forming apparatus based on the document size and the image magnification set by the image magnification setting means. The control means for selecting a sheet material size to be used for paper and controlling the set position of the sheet material width direction regulating means in accordance with the sheet material size is provided. Image forming apparatus. 3. The control means has a time measuring means for measuring the passage of time, and when there is a change in conditions for determining the sheet material size such as image magnification, the sheet material size after a certain time has elapsed from that time. The image forming apparatus according to claim 1, wherein the sheet material width direction restricting unit is controlled by selecting.