JP2749334B2 - Copier - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine of the type that performs slit exposure and guides the exposed image as it is to a photoreceptor to form a copy image. The present invention relates to a copier set so that the system scans from a direction facing a document placement reference position.

[Conventional technology]

Generally, a copier is equipped with a paper feed cassette in the left-right direction when viewed from the operation side, for example, on the right side, scans a document placed on the contact glass from the back side of the contact glass, and copies a copy on which a copy image is formed on the left side. The paper is discharged to the paper discharge tray. Although the paper feeding direction and the paper discharging direction are slightly different depending on the copying machine, in any case, a paper feeding mechanism and a paper discharging mechanism are provided on the side of the copying machine. This is because it is better to set the initial position of the exposure optical system on the document placement reference position side and to match the reference positions of both, based on the relationship between the exposure optical system and the rotation direction of the photoconductor and the feeding of the transfer paper. This is because the correlation between the original and the copy at the time can be easily obtained.

However, when the paper feed cassette and the paper discharge tray are mounted on the side of the copier body, the installation area of the copier is not limited to the plane projection area of the copier body alone. In addition to the flat projection area when the paper tray is mounted, a space for exchanging the paper cassette is required. Therefore, the actual installation area is gradually increased as compared with the installation area of the copying machine itself. For this reason,
It has been pointed out that the office space becomes smaller.

[Problems to be solved by the invention]

Under such circumstances, the installation area of the copier is reduced,
Considering the balance with other OA equipment, the appearance should be at least such that no protrusion is attached to both sides of the copying machine body. In this case, the paper supply side needs to be provided on the front side of the copying machine, that is, on the operation side, in consideration of usability. In this case, a layout in which the transfer paper is transported from the operation side of the copying machine to the rear side due to the paper discharge has to be adopted. However, if a copier having such a layout is configured using a conventional exposure optical system or a developing / fixing system, the photoconductor is located on the operation side of the copier, and the exposure optical system is used for the photoconductor. Scanning is performed from the upstream side in the rotation direction. In other words, with the above layout, the exposure optical system inevitably scans from the non-operation side of the copying machine, that is, from the back side. With this configuration, the original placement reference position is located on the back side of the copying machine in the conventional concept.
However, when the reference position for placing the document is at the back of the copying machine,
The positioning of the document becomes difficult, and the setting property of the document deteriorates. Further, if this is a book document, positioning and copying operations are more difficult, and it may be difficult to even hold down the document. Therefore, considering that the reference position of the document is set on the operation side, it is necessary for the exposure optical system to scan and copy from the reference position opposite to the document.

However, when the exposure optical system is scanned from the side opposite to the document reference position in this manner, if the document size is constant and the copy magnification is constant, the scanner start position may be set in advance. If the magnification changes, the scanner start position must be changed accordingly.

The present invention has been made in view of the above-mentioned state of the art, and an object of the present invention is to provide a document which can efficiently copy in the shortest time according to the copy magnification and transfer paper size of a document. An object of the present invention is to provide a copier in which a position is set.

[Means for Solving the Problems] The object of the present invention is to perform slit exposure, guide the exposed image directly to a photoreceptor via an exposure optical system to form a copy image, and feed and discharge paper from the operation side. In a copying machine to be used, a document reference position provided on the operation side serving as a reference when placing a document, input means for inputting a copy magnification, and transfer paper size detection means for detecting the size of the selected transfer paper Document size calculating means for calculating a document size according to the input copy magnification and the detected copy paper size;
Control means for determining a scanning start position and a document reading start position of the scanner facing the operation side across the document reference position according to the calculated document size, and the scanner temporarily moves from the operation side to the approach start position. Reading means for reading a document when moving from the approach start position to the operation side.

[Action]

According to the above means, a document reference position serving as a reference when placing a document is provided on the operation side of the copying machine, that is, on the front side of the operator, and the detected copy magnification, the size of the transfer paper to be copied, The scanning distance of the exposure optical system can be set to the minimum necessary since the starting position of the exposure optical system and the reading start position of the original can be determined from the calculated original size. Thus, the copying operation can be efficiently performed in the shortest time.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a left side view showing the internal structure of a copying machine according to an embodiment, and shows an automatic reversing document feeder (hereinafter referred to as ARDF) 100, a copying machine main body 200 and a transfer paper feeder 700 from the top. The system is configured.

As shown in the left side view showing the internal structure of FIG. 2, the ARDF 100 has three trays 101, 103, and 105, a transport belt 107 provided inside the lowermost document tray 105, and an ARDF housing including the trays. It mainly comprises a conveying roller group 111 provided on the inner side on the back side when viewed from the operation side F of the copying machine main body 109, ie, the operation side F of the copying machine main body 200.

The tray 101 is a paper discharge tray, and has a paper discharge port 102,
The copied copies discharged from the paper discharge port 102 are stacked. The tray 103 is a document placing tray, has an insertion opening 104 for introducing the document G, and places the document G to be copied. The tray 105 is a tray on which the copied originals G are stacked, and the original G on which one-sided or both-sided copying has been completed is an output port.
106 sheets are discharged and stacked in page order. The housing 109 is disposed so as to face the contact glass 203 of the copying machine main body 200, and is swingably supported on the non-operation side R so that the operation side F can be opened.

The transport roller group 111 includes a call roller 113, a paper feed roller 115, and a separation roller 116 from the insertion opening 104 side of the tray 103,
Further, along the outer periphery of the large-diameter roller 121, a pair of rollers 117, 119 and rollers 123, 124, 125 are disposed in a counterclockwise direction.
Third to third gates 127, 129, and 131 are provided along the transport path 132. Further, following the transport roller group 111, the drive roller 133, the roller 135, and the tension roller 13
7 is arranged, and the transport belt is stretched between these three rollers. In addition, a transport path 139 of the copied copy is formed on the innermost side when viewed from the operation side F of the housing 109,
Two pairs of discharge rollers 141 and 142 are provided along the transport path.

The copier body 200 has an exposure optical system 300, a developing system 400, and an image forming system 5
00, each mechanism of the fixing system 600 and the transport system 900 is provided.

The exposure optical system 300 is disposed so as to be able to scan the original image below the contact glass 203, an original illumination light source 302, a reflector 303 that reflects irradiation light from the original illumination light source 302,
It comprises first to third movable mirrors 304, 305, 306, a zoom lens 307, and first to third fixed mirrors 308, 309, 310. The original illumination light source 302, the reflector 303, and the first movable mirror 304 constitute a first scanner 320, and the first scanner 320 has the following configuration with respect to a peripheral speed (V) of a photosensitive drum 501 described later. Speed (V
/ m) to the right in FIG. 1, and at the same time, the second scanner 330 constituted by the second and third movable mirrors 305 and 306 moves at the speed of (V / 2m) to the right in FIG. The motor is driven by a drive motor (not shown) so as to move in the direction. Note that the peripheral speed of the photosensitive drum 501 is constant regardless of the magnification and the magnification. Further, the copy magnification is changed by changing the position on the optical path of the zoom lens 307 by driving a lens drive motor (not shown). In FIG. 1, when the position of the zoom lens is P, m = 0.5 (50% reduction),
For Q, m = 1 (1: 1), for T, m = 2.0 (200%
(Enlarged).

The image forming system 500 is formed around a photosensitive drum 501 provided at the lower right of the center in the drawing of the copying machine main body 200. Around this photoconductor drum 501, a charging charger 502 for uniformly charging the photoconductor, a eraser 503 for erasing unnecessary portions of the electric charge, and a first development for visualizing the toner powder on the electrostatic latent image with a magnetic brush. A device 401 and a second developing device 402, a belt transfer device 530 for transferring a photoreceptor-shaped toner image to transfer paper, and a cleaning device 508 for cleaning a toner image remaining on the photoreceptor without being transferred to the transfer paper are provided. Have been. In this case, the first and second developing devices 401 and 402 constitute the developing system 400.

The belt transfer device 530 includes a plurality of rollers 514, 515, 51
Endless belt 518 stretched over 6,517, transfer charger
519, Charger 520, Charger for adsorption of transfer paper 52
Consists of one and 522 rubber blades. When transferring, the endless belt 518 is lightly pressed against the photosensitive drum 501,
Corona discharge is carried out from the back surface with a transfer charger 519 to transfer the image onto transfer paper. Next, the endless belt 518-shaped residue is removed after the transfer paper is conveyed by the rubber blade 522,
The charge of the endless belt 518 is removed by the charge removing charger 520. Thereafter, the endless belt 518 is charged by the transfer paper suction charger 521 so that the transferred transfer paper can be suctioned.

The fixing system 600 includes a heat roller pair 605 including a fixing roller 601 and a pressure roller 602, and a fixing discharge roller pair 603.
The heat roller pair 605 is disposed so as to face and sandwich a transport path 901 following the roller 516 on the most downstream side in the transport direction of the endless belt 518. The transfer paper on which the toner image has been transferred from the photosensitive drum 501 while passing through the registration roller 706 and held by the endless belt 518 is fused with the toner image while passing between the heat roller pair 605 to be visualized. Is done. After being fixed in this manner, the transferred transfer paper (hereinafter referred to as copy paper) is conveyed to the above-described discharge tray 101 or the re-feeding device 910 described later via the fixing discharge roller pair 603. .

The transport system 900 is used to perform multiple copying and duplex copying.
A re-feeder 910 is provided in addition to the transport path for transporting the paper from the paper feeder 700 to the paper discharge tray 101. This re-feeding device 910,
The conveyance path 901 on the downstream side of the fixing discharge roller pair 603 includes first to third conveyance roller pairs 911, 912, and 913.
In FIG. 01, a perforated paper feed belt 930 for stacking and feeding copy paper is provided below, and a first and a second paper feed belt 930 for changing the direction and transporting the copy paper on the paper feed belt 930. Two gates 915, 916 are attached. These gates 9
A fourth roller pair 917, a third gate 918, a fifth roller pair 91
9, a fourth gate 920, a sixth roller pair 921, and a fifth gate 922 are arranged in this order. Further, the guide 923 and the seventh
Are provided.

The paper feeding belt 930 is set to rotate via a chamber 931 connected to a suction fan (not shown), and an alignment roller 932 is provided above the paper feeding belt 930. Also, feed belt 9
A separation roller 933 is provided on the most downstream side in the rotation direction of 30,
The copy paper is transported again from the paper feed belt 930 to the transport roller pair 707 side one by one.

The paper supply unit of the paper supply device 700 for supplying the paper is roughly divided into two. One is a multi-manual paper feeder 701 attached to the copying machine main body 200, and the other is a multi-stage paper feeder 800 having a plurality of paper feed trays.

The multi manual feeder 701 includes a paper guide 702, a call roller 703, a paper feed roller 704, and a separation roller 705. When the multi manual feeder 701 is used, the normally closed paper guide 702 is illustrated in FIG. Open and set the transfer paper as shown. Then, the set paper is pulled in by the call roller 703 and the paper feed roller 7
04, only one sheet is fed by the separation roller 705. The transfer paper introduced from the paper guide 702 in this way is temporarily stopped by the pair of registration rollers 706, and then fed in synchronization with the leading edge of the image on the photosensitive drum 501.

The multi-stage paper feeder 800 includes a paper feed mechanism 810 that can move up and down
It is mainly composed of paper trays 830, 831, 832, 833, 834 that extend over the columns. The paper feed mechanism 810 includes a call roller 81
1, comprising a paper feed roller 812 and a separation roller 813, which is driven up and down by a lifting belt 814 from the lowermost paper tray 834 to the uppermost paper tray 830. Further, the conveyance belt 815 faces the paper feed mechanism 810 and the upper and lower rollers 81
It is stretched between 6,817. Thus, when a transfer paper of any size is selected, the paper feed mechanism 810 moves up and down toward the selected paper tray, and outputs a signal from a sensor (not shown) when the paper feed mechanism 810 reaches the selected paper tray. Then, the elevation drive of the paper feed mechanism 810 stops, and the corresponding paper tray moves to the paper feed mechanism 810 side. Then, as in the case of the multi-manual feeder 701 described above, the call roller 8
11 to transfer the transfer paper to the paper feed roller 812 side,
After being separated one by one by 13, the sheet reaches the registration roller pair 706 via the conveying belt 815 via the conveying roller 707 of the upper copying machine main body 200, and the operation when stopped is enabled.

Next, a schematic configuration of a control system of the exposure optical system 300 is shown in FIG. This control system is for controlling a DC motor 17 to be controlled, and includes a micro computer (hereinafter abbreviated as a microcomputer) 20 as a control means, a programmable interval timer 21, and a transistor Q1 for driving the DC motor 17. , Q2, Q3, Q4, etc.

The microcomputer 20 is, for example, based on 78C10G and, when considered in the control system of the entire copying machine, constitutes a scanner controller located on the optical system control side with respect to the system control side responsible for overall sequence control. . To such a microcomputer 20, for example, a programmable interval timer (hereinafter abbreviated as a timer) 21 using μPD71, 054G is connected. The timer 21 is for transmitting a pulse width modulated PWM output for controlling the speed of the DC motor 17 by microcomputer control. This PWM
The control cycle is 50 [μsec], which is controlled with a resolution of 400 bits. The timer 21 is connected to an 8 MHz oscillator 22 so as to be supplied with a clock signal.

The DC motor 17 is connected to the microcomputer 20 via drive transistors Q1 to Q4. That is, when the transistors Q1 and Q4 are turned on and the transistors Q3 and Q2 are turned off, a current is supplied to the DC motor 17 in the clockwise direction (CW), and the transistors Q3 and Q2 are turned on and the transistors Q1 and Q1 are turned on.
Counterclockwise (CCW) for DC motor 17 when Q4 is off
Is supplied with a rotating current. In this case, the DC motor 17
Is rotated in the clockwise direction (CW), the first and second scanners 320 and 330 move forward, and when the DC motor 17 rotates in the counterclockwise direction (CCW), the first and second scanners 320 and 330 are set to move backward. . These rotation directions are determined by ports PF6 and PF of microcomputer 20.
Controlled by the CW signal and CCW signal respectively output from 7.

Further, a rotary encoder 23 for generating a pulse according to the rotation is directly connected to the DC motor 17. The rotary encoder 23 generates two pulse signals having different phases according to the rotation amount and the rotation direction of the DC motor 17. One is an A-phase encoder pulse ENCA, and the other is a B-phase encoder pulse ENCB. The A-phase encoder pulse ENCA is input to the counter input terminal CI of the microcomputer 20 via the frequency division multiplexer 24. Thereby, the microcomputer 20 measures the pulse interval of the A-phase encoder pulse ENCA by a counter inside the microcomputer (regulated by the oscillation frequency 10 MHz of the oscillator 25 of the microcomputer 20).
The input signal to the counter input terminal CI is an interrupt input. During the processing of the interrupt program, the measured data of the encoder interval is read, and based on this data, the rotational speed of the DC motor 17 is calculated, The calculation and output of the motor control amount by the integral control calculation (data loading to the timer 21) are performed. Specifically, A-phase encoder pulse EN
The output of the CA is frequency-divided by 1, 2, 4, and 8 by the frequency division multiplexer 24 in accordance with the target speed, and is interrupted to the CI terminal.
At the time of one frequency division, the first scanner 320 moves by 0.116 mm with one pulse of the encoder, and calculates the speed within the microcomputer 20 from the interrupt interval. Then, an output timer value is determined by a proportional / integral calculation process using the calculated speed data.

The encoder pulses ENCA and ENCB are input to the input terminal PC3 of the microcomputer 20 via the flip-flop 26, and are used for detecting a phase difference between the two, and the rotation direction of the DC motor 17 is determined based on the phase difference. That is, the A-phase encoder pulse
The state of the B-phase encoder pulse ENCB at the time of rising of ENCA is input to the port of the microcomputer 20 and is determined.

The speed control of the DC motor 17 is performed by PWM control. First, at the time of scanner scanning, that is, when the DC motor 17 rotates clockwise (CW), the transistor Q1 is turned on, while the PWM output from the timer 21 turns on and off the transistor Q4 via the gate circuit 27. , A potential difference is generated between both ends, and the motor is rotated at a speed corresponding to the duty ratio of the PWM signal. On the other hand, on return, the transistor Q3 is turned on and the PWM from the timer 21 is turned on.
The transistor Q2 is turned on / off by a signal via the gate circuit 28 to generate an opposite potential difference between both ends of the DC motor 17, and the DC motor 17 is rotated at a speed corresponding to the duty ratio of the PWM signal.

Next, the copying operation of the copying machine system having the above-described configuration will be described.

<Duplex Copying> In the case of duplex copying, two different transport paths are used for A4 (or LT) size or smaller and those other than A4 (or LT) size.

For A4 (or LT) or smaller, the fixing roller 60
When the trailing end of the copy paper passes through a pair of heat rollers 605 consisting of the roller 1 and the pressure roller 602, the sixth gate 941 is displaced downward upon receiving a signal from the sensor 940, and at the same time, the roller 911 reversely rotates to copy the copy paper. In the direction of the seventh transport roller pair 924. The copy paper discharged by the seventh conveying roller pair 924 is
It is sent to the re-feeding device 910 by 32. In this way, all of the single-sided copy paper is fed to the feeding belt 930 of the refeeding device 910.
When the paper is stacked on the upper side, a rotating paper feeding belt 930 conveys the lowermost copy paper of the stacked paper to the right in FIG. 1 via a chamber 931 connected to a suction fan (not shown). When the sheet is conveyed to the right end in the drawing of the sheet feeding belt 930 in this manner, it is disposed above the sheet feeding belt 930,
Only one sheet is fed by a separation roller 933 rotating clockwise in the drawing, and a pair of conveyance rollers 707 and a registration roller 706 are fed.
Sent to

In the case of the size paper larger than A4 (or LT), the copy paper passes through the heat roller pair 605, passes through the first conveyance roller pair 911, and is moved to the position indicated by the solid line in FIG. When the trailing edge of the copy paper passes the sensor 942, the pair of transport rollers 912, 913, 141,
142 begins to rotate in the opposite direction. Simultaneously with this reversing operation, the second gate 916 rotates clockwise in the drawing to take the position shown by the broken line, and the rear end of the copy paper becomes the front end and the conveyance path 90
From two go to the fourth roller pair 917. Copy paper size is A3
In the case of (or 17 ″), the third gate 917 takes the position indicated by the broken line, and is discharged onto the re-feeding device 910 immediately after passing through the fourth roller pair 917.

When the copy paper size is B4 (or 14 "), the third gate 918 is in the position of the solid line, the fourth gate 920 is in the position of the broken line, and immediately after passing through the fifth roller pair 919, the refeeding device 910 is reached.
Released above. When the copy paper size is A4 portrait or B5 portrait (or 11 ″), the third gate 918 and the fourth gate 920 take the position of the solid line, the fifth gate 922 takes the position of the broken line, and the copy paper is After passing through the sixth roller pair 921, the sheet is discharged onto the sheet re-feeding device 910. The subsequent operation is the same as the above-described A4.
The operation is the same as that described for the copy paper of the size.

<Multiple (Synthetic) Copying> In the case of multiple copying, regardless of the size of the copy paper, first, the first gate 915 rotates to the position indicated by the broken line, and the fixed copy paper is transferred to the transport path 902. The fourth roller pair 917 is sent.
The third gate when the copy paper size is A3 (or 17 ")
918 takes the position of the broken line and is discharged onto the re-feeding device 910 immediately after passing through the fourth roller pair 917. Copy paper size is B4
(Or 14 ″), the third gate 918 is a solid line,
The gate 920 takes the position indicated by the broken line and is discharged onto the re-feeding device 910 after passing through the fifth roller pair 919. When the copy paper size is A4 portrait or B5 portrait (or 11 ″), the third and fourth gates 918 and 920 are in solid lines, the fifth gate 922 is in dashed lines, and re-feed after passing the sixth roller 921. The paper is discharged onto the paper device 910. When the copy paper size is A4 width or less (or LT or less), the third to fifth gates 918, 920, and 922 assume the positions indicated by solid lines, and after passing above the fifth gate 922. The discharged copy paper is discharged onto the re-feeding device 910. The discharged copy paper is aligned by operating the alignment roller 932.

<Operation of ARDF> First, a case of a one-sided original will be described.

The ARDF feeds the originals G in page order, and the originals G to be copied are set on the tray 101 in the direction of arrow A in FIGS. The set document G is fed by a paper feed mechanism similar to the multi-manual paper feeder. That is, the original G is pulled in the left direction in the figure by the call roller 113, and then only the uppermost original G is separated by the separation roller 16 that rotates clockwise similarly to the paper feed roller 115 that rotates clockwise in the figure. Is fed toward the roller pair 117. Then, the sheet passes through the roller pair 119 further downstream in the conveyance direction from the roller pair 117, passes through the space between the first gate 127 and the second gate 129, and is sent between the contact glass 203 and the conveyance belt 107.
The stop position of the document G on the contact glass 203 is determined by counting the number of pulses starting from when the rear end of the document G passes the sensor 145.

When the scanning of the document G is completed, the transport belt 135 rotates clockwise in the drawing, and feeds the document G to the left in a switchback manner. At the same time, the first gate 127 rotates upward from the second lower position. As a result, the document G is guided between the roller 121 and one of the pair of rollers 119, 117a in contact with the roller 121, passes through the rollers 124, 125, and exits onto the tray 105 as indicated by the arrow B. . In this state, since the image surface of the original G is on the upper surface, if the paper is continuously discharged as it is, the page order is reversed from that at the time of setting. In order to avoid this, the device is reversed again. That is, at the same time when the sensor 147 detects the rear end of the document G, the rollers 121 and 124 are rotated counterclockwise. The inversion signal to the rollers 121 and 124 is
At the same time, the second gate 129 is turned to switch to the lower position, whereby the document G is guided and stacked on the tray 105 as shown by the arrow C with the image surface facing down from between the rollers 123 and 124. You. Such operations are sequentially repeated, and the documents are stacked in the order of the pages set on the tray 101 first.

 Next, the case of a two-sided original will be described.

For double-sided originals, use the contact glass 20
Up to the point where the document is stopped, the operation is the same as that for the one-sided document.
When the scanning of the document G on the contact glass 203 is completed,
The drive roller 133 rotates clockwise, and sends out the original G in the form of a switchback to the left in the figure. At this time, the first gate 127 is displaced upward as in the case of a one-sided original,
In addition, the third gate 131 also rotates upward and changes its position. Then, the original G that has been switched back is a roller.
The third gate 131 passes through a transport path 132 formed between the roller 121 and the rollers 119a and 117a, and the leading end of the third gate 131 reaches the front surface of the transport belt 107. Then, the drive roller 133 rotates counterclockwise, and the original G is inverted and the contact glass is rotated.
Sent on 203. The reversal timing of the drive roller 133 is set, for example, by counting the number of pulses starting from when the sensor 147 detects the leading edge of the document G. Further, the stop position of the original G on the contact glass 203 is the same as that of the one-sided original, and the rear end of the original G is the sensor 14.
It is determined by counting the number of pulses from the point of passing through 7.

When the scanning of the document G on the second side is completed, the driving roller 133
Rotates clockwise, and feeds the original G in the form of a switchback to the left. At this time, the third gate 131 is displaced downward, and the document G is sent out in the direction of arrow B from between the roller 121 and the rollers 119a and 117a and between the rollers 124 and 125, and is stacked on the tray 105. Thus, the feeding and discharging of the two-sided document is completed. Thereafter, the same operation is sequentially repeated, and the document G is stacked in the same page order as when the document G was first set on the tray 101.

The operation and control method of emphasizing the exposure optical system of the copying machine according to this embodiment for performing the above-described basic copying operation will be described in detail below.

The modes of the copier include (A) an automatic paper selection mode (hereinafter, referred to as APS mode), (B) a paper selection mode, and (C) an automatic document feeder mode (hereinafter, referred to as ADF mode). Three modes are set.

The APS mode is a standard setting mode of the copying machine. In this mode, a document size is detected (pressed) by a print input, a transfer sheet suitable for the detected document size and a set copy magnification is selected, and a copy operation is started. At this time, if no suitable transfer paper (paper) is set, a warning is displayed and the copying machine is stopped.

The paper selection mode is set so that copying is started at a specified magnification on a selected transfer paper by a print key, regardless of the document size.

The ADF mode automatically feeds the document by inputting the print key, detects the size of the document during feeding, selects the appropriate transfer paper based on the detected document size and the set copy magnification, Start the copy operation. At this time, if a suitable transfer paper is not set,
A warning message is displayed and the copier is stopped.
The settings are the same as in the S mode.

Further, in the copying machine according to this embodiment, the home position H1 of the exposure optical system 300 is the operation side F shown in FIG.
Is set at a point where the center of the scanning slit of the first scanner 320 reaches a further 5 mm in front of the operation side F of the original scale 205, and the home position H1 is the initial reference of the first scanner 320 when the power is turned on. Position. Therefore, the homing direction is set to return from the near side to the back side and back from the back side to the near side when viewed from the operation side F, as shown in FIGS. 4, 6 and 7 HOM. is there.

 Hereinafter, each of these modes will be described in detail.

(A) APS mode The document size detection in this APS mode is performed as follows.

FIG. 4 is an explanatory diagram showing the operation of the exposure optical system in the APS mode. FIG. 4 shows an example of the case of an A4 portrait size document. By using a print key input (PKON), the scanner shifts the first scanner 320 having the size detection fiber from the home position H1 to 500 mm /. s
Scanning is performed from the near side to the far side while detecting the reflected light of the original G at the linear velocity of ec (APS). The presence or absence of the document G in the width direction is detected from the start of scanning, and when the length is detected, a document size suitable for each destination is calculated, and a document reference position in front, that is, a reference position set by the document scale 205 From the above, the first scanner 320 is moved so that the center of the slit comes to a position shifted by 30 mm from the calculated length data (the position J shown in FIG.... In the case of an A4 portrait document, 332 mm from the home position H1). Slow down and stop. In other words, the first scanner 320 is stopped at a position 30 mm extra from the trailing edge of the document as a scanning start position for forming a latent image. At this time, there is about 20 mm from the size detection unit to the center of the slit, and in the case of a fixed-size original, it is possible to stop the rear end of the original within 10 mm after detection while scanning to the back side. However, when the document G is not a fixed size, the stop position is different.

The document size data may be transmitted from the scanner controller to the main controller as length data (mm) and width presence / absence data as before, or may be transmitted as compatible document size data.

The copy magnification of the document is input by a ten-key (not shown) on the upper surface of the operation side of the copying machine main body 200 or the magnification is selected by a scaling key, and the input copy magnification is transmitted to the main controller side. On the main controller side, the size of the selected transfer paper
The size of the transfer paper is detected by inputting from the transfer paper size input key of 0 or the size detection sensor of the paper feed tray, and the CPU of the main controller calculates the document size from both of them.
Scanner start position J from this document size by U
Then, the document reading start position is calculated and determined, and the document G can be scanned. Scanning of original G (SCAN1)
The operation is started in the approach section within 30 mm from the scanner start position J in response to a scanner start (running start) signal from the main controller. The scanner controller (microcomputer 20) determines that the scanner
(This position is controlled based on the encoder address.) The point at which the document reading start position is reached is transmitted to the main controller as a read edge, and the main controller uses this as a reference signal for latent image formation as in the related art. .

The read edge indicates the reference position of the scanner of the optical system, and the center of the slit is the position where the end of the document is reached. This is a position where image formation on the photosensitive member is started, and the subsequent image formation timing is controlled using the read edge as a reference signal. The transfer sheet is conveyed from the position of the registration roller 706 to the coefficient of the drum pulse from the read edge signal so that the leading end of the latent image formed on the photosensitive drum 501 matches the leading end of the transfer sheet. Conventionally, this read edge is a boundary point between the original scale 205 and the original G. However, in the copying machine system according to this embodiment, the read edge is determined on the rear end side of the original G opposite to the original scale 205. It is set based on the scanner start position.

The scanning speed from the scanning start position (same as the scanner start position) to the operation side F (front side) is the same as the transfer paper speed (V) at the same magnification, and the copy magnification (m: 0.5 to
Set to V / m by 2).

When the first scanner 320 completes scanning and reaches the home position H1, the scanner temporarily stops, and in the 1 tol mode in which the number is 1, the copying operation ends. On the other hand, in the continuous copy mode, the first scanner 320 returns to the scanner start position at a high speed (RET1) and waits for the next scanner start timing. Hereinafter, the same operation is repeated, and when the copying of the number n is completed (SCANn), the operation is stopped.

The determination from the detected data to the standard size is performed according to the flowchart shown in FIG.

That is, in step 1 (S1), the length L of the original G is 370 m.
If it is determined that it is larger than m, step 2 (S2)
The document size is set to A3 size, and if it is 370 mm or less, it is determined in step 3 (S3) whether or not it is larger than 310 mm. If it is determined in step 3 (S3) that the size is larger than 310 mm, the document size is set to B4 in step 4 (S4),
If it is determined that the distance is 310 mm or less, step 5 (S
In 5), it is determined whether it is larger than 270 mm. If it is determined in step 5 (S5) that the size is larger than 270 mm, the document size is set to A4 portrait in step 6 (S6). If it is determined in step 5 (S5) that the distance is less than 270 mm, it is determined in step 7 (S7) whether the distance is greater than 220 mm.
If it is determined in step 7 (S7) that the size is larger than 220 mm, the document size is set to B5 in step 8 (S8). If it is determined in step 7 (S7) that the distance is not more than 220, it is determined in step 9 (S9) whether the distance is larger than 190 mm. If it is determined in step 9 (S9) that the size is larger than 190 mm, the document size is set to A5 in step 10 (S10), and the presence or absence of the width W is determined in step 11 (S11). Therefore, if the width detection sensor is turned off, the document size is assumed to be A5 portrait, and if the width detection sensor is turned on, the document size is set to A4 in step 12 (A12). If it is determined in step 9 (S9) that the distance is 190 mm or less, the process proceeds to step 13 (S13).
It is determined whether or not the size is larger than 60 mm. If the size is larger than 160 mm, the document size is first set to B6 in step 14 (S14), and further, on / off of the width detection sensor is determined in step 15 (S15). . And this step 15 (S15)
When the width detection sensor is off and the document size is
When it is on, it is set to B5 at step 16 (S16). When it is determined in step 13 (S13) that the size is 160 mm or less, it is determined in step 17 (S17) whether the size is larger than 140 mm. When the size is larger than 140 mm, the document size is set to A5 in step 18 (S18) and 140 mm or less. When step 1
It is B6 in 9 (S19).

Thus, 370mm, 310mm, 270mm, 220mm, 190m
From seven types of length dimensions of m, 160 mm, and 140 mm, and the output of the width detection sensor, it is possible to detect the fixed sizes of ten types of originals G.

(B) Paper Selection Mode In the paper selection mode, first, a preliminary movement is performed as shown in FIG. This preliminary movement (PS1) moves the first scanner 320 to the scanning start position J by inputting a paper selection key or a print key (PKON). This position J is determined by the transfer paper size and the magnification. This is the original size (virtual length) calculated from the transfer paper size and the magnification selected by inputting the magnification selection key of 30 mm.
Is the distance from the reference scale (the end of the original scale 205). This distance is, for example,
When placing the A4 horizontally at 1x, 2
When the transfer paper is at the position of 40 mm and the transfer paper is reduced by 71% in A3, the position is 328 mm from the edge of the original scale 205. The calculation of this position is the same as the conventional scanner return position calculation method.

In this mode, the scanning start position of the first scanner 320 changes according to the data of the transfer paper size and the magnification whenever the selection of the transfer paper changes or the designated magnification changes as described above. The scyana will move back and forth. This is the same as moving the lens and mirror each time the designated magnification changes. When the preliminary movement (PS1) is started by the print key input (PKON), the operation is started from the conventional scanner return, and although there is a slight delay in the first copy time, it is preferable in terms of control stability.

Following the preliminary movement (PS1) as described above, scanning of the original is performed. This original scanning is the same as in the case of the above-described APS mode.
Stands by at home position H1.

(C) ADF Mode In this ADF mode, a one-sided turn of the ARDF 100 is performed in order to increase the speed and reduce the cost of the copier body 200 and the ARDF 100. Therefore, in the case of the ADF mode, the document reference position is set to the back side (R side). That is, the document reference position is reversed in the APS mode or the paper selection mode described above, and this position is the document reference position of the conventional copier, the rotation direction of the photosensitive drum 501, and the first scan 3.
This is relatively the same as the 20 scanning directions.

In this mode, when the original G is set in the ARDF 100 and the print key input (PKON) is performed, the first scanner 320 is moved to the ADF home position 474 mm deep from the home position H1.
Move fast to H2. In the ADF mode, the original set reference position is 444 mm from the home position H1 because the contact glass 203 is set to the maximum size of the vertical position of A3, and the first scanner 320 has a 30 mm approach distance. Become.

Scanning of the original is the same as the conventional one. When the scanner start signal is received from the main controller, the scanning starts, and
A read edge signal is transmitted at an encoder address corresponding to 4 mm, and is used as a reference signal for subsequent latent image formation. When the scanner return signal obtained from the document size is received from the main controller, the scanner returns to the 474 mm position at a high speed (RET1). In the above description, the conventional home position sensor is not located at the position of 474 mm of the copying machine main body 200, but is replaced by the encoder address. However, in the case where a position error due to repetition occurs, the accuracy can be improved by providing the second home position sensor at a position of 474 mm.

At the end of scanning of the last original set in the ARDF 100, the scanner return operation is not performed, and the first scanner is not operated.
Return to 320 home position H1 and stop.

Note that the preparatory movement (PS2) is performed during the feeding of the first document, and there is no delay in the copy time. Further, the movement to the home position H1 after scanning does not affect the copy speed of the copying machine 200 during the copy cycle.

As described above, in the above embodiment, the exposure optical system 300 scans in the front-rear direction with respect to the operation side F, and the document reference position is located on the near side as viewed from the scanning side F of the document table or the contact glass 203. When the scanner moves forward, it moves to a scanning start position J that matches the virtual document size calculated according to the copy magnification and the transfer paper size, and performs exposure scanning of the document G when the scanner moves back.

For this reason, the operator can copy the original by setting the original on the original scale 205 on the front side as if it were the same as before, and the original is scanned from the rear end side of the original G in the related art. Ends with At this time, if the transfer paper and the copy magnification are determined, the copyable document area is determined irrespective of the document size. Therefore, unnecessary operation of the scanner such as overrun in the non-document area is eliminated, and the copy speed is improved. Will be.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, a document reference position provided on the operation side as a reference when placing a document, input means for inputting a copy magnification, and a selected transfer A transfer paper size detecting means for detecting the paper size is provided, and the original size is calculated according to the input copy magnification and the detected transfer paper size. Since the reading start position is determined, it is possible to provide a copying machine capable of copying efficiently in the shortest time. In addition, since the reference position of the document is determined on the operation side, the document can be set on the operation side, thereby feeding and discharging the paper on the operation side to reduce the installation area. There is no loss of advantage.

[Brief description of the drawings]

1 is a left side view schematically showing the internal structure of a copying machine, FIG. 2 is a left side view schematically showing the internal structure of an ARDF, and FIG. FIG. 3 is a block diagram showing a scanning control system of the exposure optical system, FIG. 4 is an explanatory view of the operation in the APS mode, FIG. 5 is a flowchart showing the procedure of detecting the size of the original, and FIG. FIG. 7 is an operation explanatory diagram in the ADF mode. 100: ARDF, 200: Copy machine, 203: Contact glass, 205: Original scale, 300: Exposure optical system, 30
2 ... Light source for document illumination, 303 ... Reflector, 320 ... First scanner, 330 ... Second scanner, 400 ... Development system, 50
0: image forming system, 501: photosensitive drum, 530: belt transfer device, 600: fixing system, 700: transfer paper feeding device, 800
…… Multi-stage paper feeder, 900 …… Transport system.

────────────────────────────────────────────────── ⁶ Continuation of the front page (51) Int.Cl. ⁶ Identification symbol FI G03G 21/00 378 G03G 21/00 378 (56) References JP-A-62-117462 (JP, A) JP-A-63-247742 (JP, A) JP-A-60-83023 (JP, A) JP-A-60-6938 (JP, A) JP-A-62-941 (JP, A) JP-A-52-133219 (JP, A) Opened Showa 61-121443 (JP, U) Opened Showa 55-172939 (JP, U) Opened Showa 60-41954 (JP, U) Opened Showa 63-144633 (JP, U)

Claims (1)

(57) [Claims] 1. A copying machine which performs slit exposure, guides the exposed image to a photoreceptor as it is via an exposure optical system to form a copy image, and feeds and discharges paper from an operation side. A document reference position provided on the operation side as a reference for placing, an input means for inputting a copy magnification, a transfer paper size detecting means for detecting a size of the selected transfer paper, and a copy paper input A document size calculating means for calculating a document size according to the ratio and the detected transfer paper size; and a scanning start position and a document which are opposed to the operation side across the document reference position according to the calculated document size. Control means for determining the reading start position of the document, and reading means for reading the document when the scanner temporarily moves from the operation side to the approach start position and moves from the approach start position to the operation side. Copier featured.