JPS6370865A - Electrophotographic copying machine with automatic magnification selecting function - Google Patents

Abstract

PURPOSE:To freely adjust a copy magnification in accordance with a request for the variable power of a copy at every user, even at the time of an automatic magnification selection mode, by correcting the copy magnification which is determined by an original size and a paper side at the time of automatic magnification selection mode. CONSTITUTION:An electrophotographic copying machine is provided with a copying means for generating the electrostatic latent image of an original on a photosensitive body, and transferring it on paper fed by a paper feeding means. Also, this copying machine is provided with an original size detecting means for detecting the size of the original, a paper size detecting means for detecting a paper size selected by a paper selecting means, an optimum copy magnification arithmetic means for calculating an optimum copy magnification from original size information detected by the original size detecting means and paper size information detected by the paper size detecting means, and a correcting means for correcting the optimum copy magnification calculated by this optimum copy magnification arithmetic means. In such a way, the copy magnification which is selected can be adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electrophotographic copying machine equipped with an automatic magnification selection function that selects an optimum copy magnification based on original size and paper size.

(Prior Art) Some electrophotographic copying machines are equipped with an automatic magnification selection (AMS) mode.

In this type of electrophotographic copying machine, when the automatic magnification selection mode is selected, the document size is first detected.

Alternatively, the size of the document is detected along with the operation of the automatic document feeder (ADF). Next, based on the detected size of the original (vertical x horizontal) and the size of the paper to be copied, the copy magnification is automatically set to avoid loss of the image copied onto the paper. Ru.

(Problem to be Solved by the Invention) By the way, in an electrophotographic copying machine equipped with the automatic magnification selection mode as described above, when copying is performed in the automatic magnification selection mode, the copy magnification is determined based on the document size as described above. This is uniquely determined by the paper size. For example, if the size of the original is A4 and the size of the paper to be copied is A4, in the automatic magnification selection mode, Xl, 000 is selected as the copy magnification.

However, if the manuscript is written on one side of A4 paper, the user may choose a copy magnification that is a little smaller than Xl, 000, such as Xo, taking into consideration the binding margin of the copied paper.

You may want to select 950. However, in such a case, copying should be done in manual mode instead of automatic magnification selection mode, but people often forget to switch to manual mode when copying.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrophotographic copying machine having an automatic magnification selection function that allows adjustment of the selected copy magnification depending on the document size and paper size in an automatic paper selection mode.

(Means for Solving the Problems) Therefore, the present invention provides a paper supply means that includes a plurality of paper feed ports and supplies paper, a paper selection device that selects the paper feed port, and a Copying means using electrophotography to create a latent image on a photoreceptor and transfer it to paper supplied by paper supply means, document size detection means to detect the size of the document, and paper selected by the paper selection means. paper size detection means for detecting the size; optimal copy magnification calculation means for calculating the optimal copy magnification from the document size information detected by the document size detection means and the paper size information detected by the paper size detection means; The present invention is characterized by comprising a correction means for correcting the optimum copy magnification calculated by the optimum copy magnification calculation means.

(Function) In the automatic magnification selection mode, the optimum copy magnification calculation means calculates the optimum copy magnification from the original size detected by the original size detection means and the paper size detected by the paper size detection means. This calculated copy magnification is corrected by a correction means. The correction magnification by this correction means is set to a desired value by the user.

(Example) Hereinafter, the present invention will be described in detail in the following order with reference to the accompanying drawings.

a. Configuration of the copying machine, operation panel C1 Configuration of the control section of the copying machine d. Operation of the copying machine body <d-1> Main routine <d-2> Paper selection <d-3> Change key processing <d- 4> APS magnification change <d-5> AMS magnification change <d-6> ADF reservation start <d-7> Copy operation e, ADF operation (communication with other CPUs) Automatic paper selection particularly related to the present invention Regarding mode processing, especially <d-3> in section (d).

It is described in <d-5> and <d-7>.

(a) Structure of Copying Machine FIG. 1 shows a schematic sectional view of an electrophotographic copying machine according to the present invention.

This electronic photocopier body! The copying mechanism is similar to that of a conventional electrophotographic copying machine. In the center of the copying machine body 1,
A photoreceptor drum 2 that can be rotated in a counterclockwise direction is provided, and around the photoreceptor drum 2 are a main routine 3, a sub charger 4, a sub eraser lamp 5,
A main charger 6, a developing device 7, a transfer charger 8, a transfer paper separation charger 9, a blade type cleaner device 10, and the like are arranged in this order. The photosensitive drum 2 is
It is a drum having a photoreceptor (for example, selenium) on its surface, which is irradiated with light by an eraser lamp 3.5 for each copy, charged by passing through a charger 4.6, and then charged by an optical system as described below. image exposure from. The motor M1 drives the photosensitive drum 2 and the like.

The optical system is installed below the document table glass 11 so that the document image can be scanned. The optical system includes a light source 12, a first mirror 13, a second mirror 14, a third mirror 15, and a projection lens 1.
6 and a fourth mirror 17. The original image is line 1
As shown at 8, the light passes through each mirror 13, 14, 15, 17 and reaches the photosensitive drum 2. Fixed position switch 5W5
0 is provided to detect whether the optical system is at a predetermined position during scanning. The magnification is set by moving the projection lens 16 in the optical axis direction using a motor M4. Note that the motor M3 drives the optical system. When the copying magnification is n, the light source 12 and the first mirror 13
(constant regardless of whether the magnification is the same or variable magnification)
It is moved to the left by the motor M3 at a speed of (v/n), and at the same time, the second mirror 14 and the third mirror 15 are moved at a speed of (v/n).
/ 2 n) to the left. Along with this movement, the image is exposed from the fourth mirror 17 onto the photosensitive drum 2 in a slit shape.

On the left side of the copying machine body, there is an automatic paper feed cassette 20°21
are installed at the first paper feed port on the upper side and the second paper feed port on the lower side, respectively. The paper in the automatic paper feed cassettes 20 and 21 is selectively fed into the copying machine main body 1 by the respective paper feed rollers 22 and 23, passes through each pair of transport rollers 24 and 25, and then passes through the timing rollers in a crimped state. It is transported to 26, where it is temporarily put on standby.

During transfer, the paper fed by the timing roller 26 comes into close contact with the photoreceptor drum 2 in the transfer section, and the toner image is transferred by the corona discharge of the transfer charger 8, and then the toner image is transferred by the corona discharge of the separation charger 9 and the transfer paper. It is separated from the photosensitive drum 2 by its own strength. Subsequently, the paper is conveyed to the right as the belt 27 rotates clockwise while being sucked onto a conveyor belt 27 equipped with an air suction means (not shown).

Next, the toner image is melted and fixed by passing through a fixing device 28. Then, it passes through a pair of discharge rollers 29 and is discharged to a tray 30 outside the copying machine main body 1 or a collating machine (not shown).

One type of paper switch 401, 402 and 403゜404
are microswitches that detect the type (color) of paper in the cassettes 20 and 21, respectively.

Detection of the type (color) of paper set in the cassette 20 by the one-type paper switches 401 and 402 is performed as follows. That is, as shown in FIG. 2(a), a display board 35 provided with a magnet M at one end is positioned on one side surface 20b of the cassette 20 in the direction in which the cassette is inserted into the cassette insertion opening 20a. This display board 35
On the other end side, as shown in Fig. 2(b), black B, white ~
Four colors are displayed: v1 red R1 yellow Y. This color-displayed portion is inserted into a space formed by the side surface 20b and the guide plate 20c, and the display plate 35 can move within this space in the cassette insertion direction. In the display board 35, the magnet M
The position of the paper type switch 401 changes depending on the color.
A color signal is obtained by a combination of on/off of 402.

Note that the guide plate 2Qc is provided with a window 20d, and the color set by moving the display plate 35 can be discerned with the naked eye through the window 20d.

Returning to FIG. 1 again, the paper size detection switches 410 to 413 and 414 to 417 are microswitches arranged in parallel at the upper and lower paper feed ports, respectively.
Vertical to the paper size and paper feeding direction within 0.21,
Detects which direction it is installed horizontally. The sizes that can be copied, that is, the sizes of paper that can be set in each paper feed section are, for example, [A3], [A4], CA5], [B
11. EB5], and vertical and horizontal can be selected for [A4] and [B5]. In addition, switches 420, 42
1 also detects the attachment and detachment of the cassettes 20 and 21, which means that the presence or absence of paper at each paper feed port is indirectly detected. Then, the size and setting direction of the paper can be set using switches 410 to 413 and 414 to 417.
It is detected by a 4-bit code corresponding to the on/off combination of the
Stored in AM. An example of a code table for switches 410 to 413 is shown in Table 1 below. In Table 1, the on state of the switch is indicated as [0] and the off state is indicated as [1], and when all the switches are off, the cassette 2
0 is not attached to the paper feed unit, that is, the absence of paper is detected.

Margin Table 1 below The APS change key 501 is a switch provided to change the magnification range of the paper selected in the automatic paper selection mode.
9 (see FIG. 3).

Further, an AMS change key 502 is provided to change the magnification selected in the automatic magnification selection mode.

The magnification to be changed can be changed using the numeric keys 60 to 69 in the same way as above.
(See Figure 3).

The priority paper feed port set keys 503 and 504 are switches provided to specify a priority paper feed port, and if the priority paper feed port is specified by the priority paper feed port set keys 503 and 504, First, the paper feed slot is checked.

On the other hand, in the document feed unit (DF) 300 of the automatic document feeder (ADF), a sensor 310 detects whether or not a document has been fed, and a sensor 311 detects whether or not there is a document in the document tray 304. To detect.

The motor 301 is connected to the document transport belt 305 of the DP 300.
The motor 302 feeds the original from the original tray 304 while avoiding rotation of the motor 302 .

When copying, when you press the print switch 50 (see Figure 3) on the operation panel of this electrophotographic copying machine, which will be explained in section (b), the automatic document feed function is activated, and the DF300 moves to the document tray. The original on the belt 304 is sent out, and the belt 305
The original is moved to a fixed position on the original glass 11 on the upper surface of the copying machine main body 1.

A sensor 310 determines the size of the original while it is being sent.

After the belt has stopped moving, the copying machine body 1
starts working. In this operation, the mode is set by connecting the ADF and placing the original on the original tray 304. The DF300 can be opened and closed like a document cover. If the DF300 is opened or closed and a document is manually placed on the document glass, ADF mode will be canceled.
Normal copying operations are performed. When the ADF mode is canceled, the document size cannot be detected, so if the automatic paper selection mode has been selected, this mode is also canceled.

(b) Operation Panel FIG. 3 shows the operation panel of this electrophotographic copying machine. The operation panel is provided with keys indicated by the following reference numbers.

50: Print switch for starting copying.

51: Number display LED for displaying the number of copies per copy 052: Paper empty display.

53: Exposure up key. 54: Exposure down key.

60-69: Numeric keypad for entering numbers such as the number of copies.

70: Interrupt key for interrupt copying.

71: Functions as a stop key to stop multi-copying and a dual-purpose key to clear the set number.

75: Paper select key.

76-79: A3. B4. A4. B5 selection display.

80: Reduction magnification selection key from A3 to A4.

81: Reduction magnification selection key from A3 to B4.

82: Enlargement magnification selection key from A4 to A3.

83: Enlargement magnification selection key from B-1 to A3.

84: Same size selection key.

85-88: Selection display of select keys 80-83, respectively.

89: Same size selection display.

FIG. 4 shows the ADF operation panel provided on the DF300. A select key 320 is provided on this operation panel. Display LEDs 320a, 320b, and 320c indicate that automatic paper selection mode, automatic magnification selection mode, and manual mode have been selected, respectively. Each time the select key 320 is pressed, the selected mode changes and the illuminated LED changes.

(c) Structure of the control unit of the copying machine FIG. 5 shows the CPU (
201) is shown. The input terminals include various signals (main motor, developing motor, timing roller clutch, upper paper feed clutch, lower paper feed clutch, charging, transfer), various sensors, keys, etc. (50, 53, 54, 60-71
, 75, 80-84.401-404, 410-417
,420°421.501,502,503,504
) switch matrix 204 is connected. The output terminal has a 4-digit numerical display 51 and an LED matrix (
31-34, 36-39) are connected and driven by the CPU via a decoder 207. Further, the paper empty display 52 and the same magnification display 89 are also connected. Bus 2+4 is for other CPUs (CPU2.CPU3)
It is a communication line to connect with.

FIG. 6 shows the input/output configuration of the CPU 2 (202) that controls the optical system. The input/output board of the CPU 2 includes a scan motor control circuit 205 that controls the scan motor M3, and a motor M4 that moves the projection lens 16.
It is connected to a lens control circuit 206 for zooming. Also, a fixed position switch SW50 of the optical system and a switch 5W51 that generates a timing signal for rotating the timing roller 26 at the same magnification (see Fig. 1).
A signal is input from This CPU 2 communicates with the CPUI via the bus 214, as described above.

FIG. 7 shows the input/output configuration of the CPU 3 (203) that controls the DF 300. The CPU 3 outputs signals to the conveyance belt motor 301 and the paper feed motor 302, and receives signals from the document feed sensor 310 and the document detection sensor 31. Furthermore, a select key 320 and a display LED 320a.

320b and 320c are connected. Further, this CPU 3 communicates with the CPUI via the bus 214.

(d) Operation of the copying machine main body The contents of the CPU program that controls the copying machine main body 1 will be outlined below.

<d-1> Main Routine FIG. 8 shows a schematic flowchart of the operation of the CPU 1.

When the CPU is reset and the program is started, initialization of the CPU 1 such as clearing of RAF/1 and setting of various renostars and initial settings to put the device in the initial mode are performed (step Sl). Next, C.P.
An internal timer built into the UI and whose value is set in advance as an initial setting is started (step S2). Next, various processing units include paper selection (subroutine S3), change key processing (subroutine s4),
The following subroutines are sequentially performed: APS magnification change (subroutine S5), AMS magnification change (subroutine S6), ADF reservation start (subroutine S7), and copy operation (subroutine S8). Next, data communication with the CPU 2.3 is performed (subroutine S9).

When all subroutine processing is completed, wait for the end of the internal timer set first (step 5IO),
1 routine is completed and the process returns to step s2. Using this length of time for one routine, count the various timers that appear in the subroutine (various timer values are
The end of the timer is determined based on how many times this l routine has been repeated. ).

<d-2> Paper Selection FIGS. 9(a) and 9(b) show the flow of the paper selection routine (subroutine S3).

In the paper selection routine S3, in block 1 of FIG. 9(a), if the priority paper feed port is set at power supply 08 (steps S301 and 302), that paper feed port is selected (step 5303).

Next, in block 2, if the paper becomes empty during copying using the first paper feed port of the automatic paper feed cassette 20 (step 5304), the automatic paper feed cassette 20
It is determined whether the paper size of the second paper feed port is the compatible paper size found in the flowchart of FIG. 16, which will be described later (step 5305). With this judgment,
If it is determined that the paper size in the second paper feed port is not the compatible paper size, the paper empty display 52 is turned on (step S308), and copying is stopped.

In addition, if the paper size of the second paper feed port is determined to be the compatible paper size by the above determination, the second
The paper feed port is selected (step S306), the copy start flag is set to "B" (step 5307), and the copying operation is continued.

On the other hand, if the paper becomes empty during copying in the second paper feed port (step 309), similarly to the above, the paper size of the first paper feed port is the compatible paper determined in FIG. 16 described later. It is determined whether the size is the same (step 5310). If this judgment determines that the paper size in the first paper feed port is not the compatible paper size,
Turn on paper empty display 52 (step 312)
L. Stop copying. Further, if it is determined that the paper size of the first paper feed port is the compatible paper size through the above determination, the first paper feed port is selected (step 531
1) L, copy start flag set to 11 (step S
307) Continue the copy operation.

Next, as shown in FIG. 9(b), when copying is not in progress (step 5313), the paper select switch 75
is turned on (step 5314), and if it is determined that the first paper feed port is currently selected at that ON edge (step 5315), the second paper feed port is selected (step 5316).
, if the second paper feed slot is selected, select the first paper feed slot (
Step 5317), enter the paper size code. Then, call the paper size code conversion routine (details will be explained next) (subroutine 63).
18), the paper size LED that is set
76-79 are turned on (step 5319).

Figure 10 shows the paper size code conversion routine 531g.
shows. Paper size is coded as shown in Table 1. If the input paper size code is "4" (step 5320), the paper size is B5 portrait, so the paper length is 257 mm and the paper width is 182 mm (step 5330).

Below, if the paper size code is "5" (step 5321), A4 portrait, if it is "6" (step 5322)
If B4 vertical, “7” (step 5323) A3 vertical, “
lO” (step 5324) I35tA, “11
"If so (step 5325), it is determined that each paper is A4 landscape, and the paper length and width of each paper are memorized (
Steps 5330-335). If the code is not the above, it is determined that there is no paper (step 9326).

<d-3> Change key processing FIG. 11 shows the change key processing routine S4.

In block 1 of this change key processing routine S4, when automatic paper selection is desired, it is determined whether or not the APS change flag is "0" when the APS change key 501 is turned on (steps 5401 and 402). When the APS change flag is determined to be “0”, the APS change flag is “0”.
bit (step 5403), and the input counter is also “l”.
(Step 5404). In addition, when the APS change key 501 is turned on, the APS change flag is set to “0”.
If it is not determined, the APS change flag is set to “0”.
(Step 5405).

On the other hand, in block 2 of the change key processing routine S4, when it is desired to change the magnification of automatic magnification selection (AMS), it is determined whether or not the AMS change flag is 0'' by pressing the AMS change key 502 (step 5406
, 5407). If the AMS change flag is determined to be "0", the AMS change flag is set to "1" (step 840).
8), and if the AMS change flag is not determined to be '0', the AMS change flag is set to '0' (step 5409).

<d-4> APS magnification change FIG. 12 shows the APS magnification change routine S5.

First, it is determined whether or not the APS magnification change flag is "B" (step S500). The value is stored in the magnification memory MlO,
Store it in Ml l and set the manual counter to “2”.
After that (steps 501, 511, 521), the process returns.

Also, if the APS magnification change flag is "B" and the manual counter is "2", the value input using the numeric keys 60 to 69 is stored in the magnification memories M21 and M22, and the input counter is set to "3" and then (Step 502, 5
12,522) Return and repeat the same steps.Finally, if the input counter is "8", the value input using the numeric keys 60 to 69 is stored in the magnification memory M81. M
82 and set the APS change flag to “0”.
(Steps 5508, 518, 528). Then, if the APS change flag is not "BI" and if the input counter is neither "BI" nor "8", the process returns.

<d-5> AMS magnification change FIG. 13 shows the AMS magnification change routine S6.

First, it is determined whether the AMS magnification change flag is "B" (step 5601). If the AMS magnification change flag is "0°", return is made, and if it is "B", the magnification correction flag is set to "B". After that (step S602), the values input using the numeric keys 60 to 69 are stored as correction factors (step 5603). Then, when the on-edge of the clear key (combined key 71) is detected (step 56
04), the magnification correction flag is set to “O” (step 56).
05), then return.

The above step 560 of this AMS magnification change routine S6
2.5603 allows the user to correct the copy magnification even in AMS mode.

<d-6>ADF reservation start Figure 14 shows the ADF reservation start routine muff.

This ADF reservation reservation start routine muff determines whether or not this electrophotographic copying machine is in the temperature control wait state (step 570).
1) If L is in temperature control wait, print switch 5
It is determined whether or not ADP is used on edge 0 (steps 5702, 703).

In the case of using the ADF, it is determined whether or not there is a document in the document tray 304 (step 5704), and the ADF start signal is set to "bi" (step 5705).

On the other hand, when the print switch 50 is off, it is determined whether or not the ADF is used (step S70G).

In the case of using ADP, when the original is fed to the home position and the original home position signal becomes "B" (step 5707),
It is determined whether the mode is automatic paper selection mode (step 5708). If it is not automatic paper selection mode, set the start memory flag to l” (step 5).
711). In automatic paper selection mode, the first
Automatic paper selection routine (subroutine S) in Figure 5
709) and determines whether the size nonconformity flag is "0°" (step 5710). In determining whether the size nonconformity flag is "0",
If it is determined that the size incompatibility flag is "0", the start memory flag is set to "blink" (step 5710), and if it is determined that the size incompatibility flag is not "0", the compatible paper size display is blinked (step 5712) and the paper set wait is started. The flag is set to "pi" (step 5713).

Next, during the temperature control wait, the paper set wait flag is displayed.
When detecting that the compatible paper size has been newly set (steps 5714, 715, and 716), the paper set waiting flag is set to "0" (step 5717).
, set the start memory flag to “B” (step 571).
8).

Thereafter, the AHA wait end edge is detected (step 5719), and it is determined whether the start memory flag is "bi" (step S720). If the start memory flag is "bi", the start memory flag is set to "bi". If the start memory flag is not "BI", it is determined whether the paper set flag is "1" (step 5723). When this paper set waiting flag is “BI”, the display LED 320
c is turned on and the display LEDs 320a and 320b are turned off (step 5724) to cancel the APS mode and automatically convert to manual copy mode.

The automatic paper selection routine 5709 that appeared during the ADF reservation start routine S7 explained above is the 15th
In this automatic paper selection routine 5709 shown in the figure, the CP
The document size data sent from U3 is stored in the A register (step 5751), and the paper calculation table shown in FIG. 16 is called (subroutine S75).
2). This subroutine 5752 finds the optimal paper size based on the original size and the copy magnification range set by the APS magnification change routine S5 in FIG. 12 (step 5771), and stores it in the L register (step S772). Return. After that, it is determined whether the value of the L register is the same as that of the previous document (step 5753), and the value of the L register is the same as that of Moe's document, that is, documents of the same size are consecutively set. When the paper feed slot is changed, the continuous flag is “B”.
The size incompatibility flag is set to "0" and the process returns (steps 5754, 761). And otherwise,
First, the selected paper feed port is checked (step 5755), and if there is a suitable size, that paper feed port is selected. As a result, if the user first selects a desired paper feed slot in which paper of an appropriate size is set, that paper feed slot will be selected with the highest priority. Also, if the paper is the same size but different colors,
A predetermined paper feed port can be specified.

On the other hand, if the priority paper feed slot is set using the priority paper feed slot set key 503 or 504, first check that paper feed slot (step 5756), and select the paper feed slot if it is a suitable size. do.

In cases other than the above, the A register is compared with the paper size of the upper paper feed cassette 20 (step 5757). Equally, one type of paper is standard paper, that is, sensor 4
If 01 and 402 are both off (step 5758)
, set the size nonconformity flag to “0” in step S75.
9) Select the upper paper feed port (first paper feed port) (step 5760). Next, the A register is set to the sketch paper cassette 21.
paper size (step 8762). equally,
If one type of paper is standard paper, that is, both paper one type switches 401 and 402 are off (step 3763), the size mismatch flag is set to "0" and the lower paper feed slot (second paper feed (step 5765). If the paper size is not equal to either the first paper feed port or the second paper feed port, the size incompatibility flag is set to "l" (step 8766).

<d-7> Copy operation Fig. 17(a), Fig. 17(b) and Fig. 17(C)
The flow of the copy operation routine S8 is shown in FIG.

Since this embodiment has an ADF reservation start routine, first, as shown in FIG. 17(a), it is determined whether or not the electrophotographic copying apparatus is in the temperature control wait state (step 5801). , if in ill wait, XI
The process then proceeds to each step shown in FIG. 17(b).

On the other hand, if the temperature control wait is not in progress, print button 5
0 ON edge (step 5802), it is determined that the paper empty display 52 is off, and if it is off (step S803), and if the ADF is not used (step S5804), the copy start flag is set to "B" (step S803). 5805).If ADF is used (step 5804)
, it is determined whether or not there is a document in the document tray 304 (step 5806), and if there is a document, the ADF start signal is set to "B" for the DF 300, and the continuous copy flag is set to "B" (steps 5807, 709). ).

If the paper empty display 52 is on (step 5
803), proceed to the next step from XI.

Also, if the timing is not the ON edge of the print switch 50 (step 5802), if the ADF is used (
Step 5810), when the original position signal from the DF 300 becomes "BI" (step 5811), it is determined whether the paper empty display is off (step 5812)
. If the paper empty display is on, the process proceeds from Xt to each step in FIG. 17(b). In addition, if the paper empty display is off, it is determined whether or not the automatic magnification selection mode shown in FIG. The magnification selection routine is called (subroutine 5814). As a result, if the magnification mismatch flag is “1°” (step 5815), the display LE
Light up D320c and display LED 320a, 320b
is turned off, and the AMF' mode is automatically switched to the manual mode (step 5816).

On the other hand, if the magnification incompatibility flag is "0", when the ADF mode is automatic paper selection mode (step 5817), the automatic paper selection routine already explained in FIG. 15 is called (subroutine S7).
09). As a result, if the size incompatibility flag is "θ" (step 5819), the copy start flag is set to "bi" (step 5820). If the size incompatibility flag is "bi", it is displayed, the ED 320c is lit, and the display LED 320a is
, 320b is turned off, and the ADF mode is automatically switched to manual mode (step 5821).

By automatically switching to manual mode as in this embodiment, people who don't want to search for paper can just start printing and still be able to make copies even if the paper is not the most suitable. All one has to do is set the optimal paper.

The following copying operation is the same as the conventional one. Figure 17(b)
When the copy start flag becomes 1' in step 5822, the main motor Ml and the developing motor are turned on.
Turn on the charging charger, transfer charger, etc., set the copy start flag to "0", and start T-A (timer A), T-
B (timer B) is set (step 5823).

If the first paper feed slot is selected (step 5824)
, the main paper feed roller clutch (not shown) is turned on (step S825). If the second paper feed port is selected (step S826), a sketch paper roller clutch (not shown) is turned on (step S827).

In step 5828, TA is determined and T-A is determined.
When the timing is reached, the upper and lower paper feed roller clutches are turned off (step s829).

In step 5lot, TB is determined (step S830). When it is time for T-B to end, the scan signal is turned on (step 5831).

In step 5832 of FIG. 17(c), when the timing signal reaches 1", a timing roller clutch (not shown) is turned on and T-C is set (step S
833).

In step 5834, at the timing when TC ends, the charging, scan signal, and timing roller clutch are turned off (step 5835).

In step 8836, the return signal of the optical system is “
At step S, in other words, when the return is started, it is determined whether the multi-copy portion has been completed.
837), if not, it is determined whether the paper is empty (step 5846), and if the paper is not empty, the copy start flag is set to "bi" (step 5847).

On the other hand, when the multi-copy portion is completed, if the ADF is used (step 5838) and there is no next document in the document tray 304 (step 5839), the continuous copy flag is set to "0°" (step 5840). If the ADF is not used (step S83B) and there is still the next document in the document tray (step 5839), the continuous copy flag is not set to "θ".

Then, when the scanner that once left the home position returns and turns on the home position sensor 5W50 (step 584
1) Stop the developing motor and transfer, and set T-D (step 5842).

At the timing when T-D ends (step 984
3), stop the main motor M1 (step 584
4). Then, the results of the processing up to now are output (step 5845).

Next, the automatic magnification selection routine 5814 shown in FIG. 17(a) will be explained with reference to FIG.

In this automatic magnification selection routine 5814, CPU3
The vertical length of the document size data detected and transmitted is stored in the A register (step 581). Similarly, the document size data horizontal length from CPU 3 is stored in the B register (step 582).

Next, the vertical length of the paper is divided by the vertical length of the original stored in the A register, and the result (magnification of the paper relative to the original) is stored in the A register (step 583).

Similarly, the horizontal length of the paper is divided by the horizontal length of the original stored in the B register, and the result (the magnification of the paper relative to the original) is stored in the B register (step 584).
.

Then, the magnifications stored in the A register and B register are compared, and the smaller magnification is stored in the C register (steps S85, 86.87).

Next, it is determined whether the magnification correction flag is "BI" (step 588), and if it is "BI", the value of the C register is multiplied by the correction factor and the result is stored in the C register (step 589), "0'', the original value is stored in the C register.

Step 590) to determine whether the value of the C register obtained above is outside the possible magnification range of the copying machine.
If the value of the C register is outside the magnification range, the magnification incompatibility flag is set to 1 (step 591). Furthermore, if the value of the C register is within the magnification range, the magnification mismatch flag is set to 0° (step 592), and the value of the C register of the CPU 2 is transmitted (step 593).

(e) ADF operation (communication with other CPUs) Figure 19 (
a), (b)+: CPU that controls DF a o o
3 shows the general flow.

CPU 3 (L) When a reset is applied and the program is started, the CPU 3 is initialized by clearing the RAM, setting various registers, etc., and initial settings are made to put the device into the initial mode (step 5901).

Next, an internal timer built into the CPU 3 and whose value is set in advance as an initial setting is started (step 5902).

Next, the subroutines of document size detection (subroutine 5904) and mode selection (subroutine S 905) of document control (subroutine 5903) are sequentially called. When all subroutine processing is finished, wait for the end of the internal timer that was set first, and
The routine ends (step 9906). The length of time of this l routine is used to count the various timers that appear in the subroutine. (The various timer values determine the end of the timer based on how many times this one routine has been counted.) Also, as shown in FIG. 19(b), data communication with the CPU (step 5909) is as follows: This is performed by an interrupt routine, regardless of the main routine, in response to an interrupt request from the CPUI (step S907).

FIG. 20 shows the document control routine 5903.

There is a document in the document tray 304 (document detection sensor 311
is on) (step 5911), from cpUl to AD
When the F start signal becomes “B” (step 5912),
Or, if the document feed flag becomes “Pi” (step 5)
913), after setting the document feed flag to "0" (step 5914), the conveyor belt motor 301 is turned on, and the document feed motor 302 is turned on (step 5915).
.

Next, processing is performed in the document feeding processing routine (see FIG. 21) (subroutine 5916), and when scanning for the set number of sheets is completed (step 5917), the scan end flag is set to "1" (step 5918). ).

When the scan end flag is “1” (step 5919)
, set the ski/yan end flag to “0” in step S9.
20), the document ejection processing routine (see FIG. 22) is executed (subroutine 5921).

FIG. 21 shows the flow of the document feeding processing routine 5916.

When a document is fed and the document feed sensor 310 is turned on (step 5922), the flag K is set to "B" and the timer At is started (step S92a). This timer AI starts feeding the previous document. This is used to stop the document feed motor 302 in order to prevent the document from being fed until the next document is fed, and a timer value is set until the document reaches the position where it is driven by the conveyor belt 305.

Next, when the flag K is “pi” (step 5924),
When the OFF edge of the document feed sensor 310 comes, that is, when the trailing edge of the document is detected (step S925), the flag K is set to 0" and the timer A2 is started (step S926). The value of the timer A2 is , a value is set until the trailing edge of the document reaches the fixed position of the leading edge of the document on the document glass.

When the timer AI ends (step S927), the document feed motor 302 is stopped (step 5928). At the end of timer A2 (step S929), the conveyor belt motor 301 is stopped (step 5930), and the original position signal is sent to CPLJI (step 593).
1).

FIG. 22 shows the flow of the document discharge processing routine 5921.

If the document detection sensor 311 determines that there is still another document in the document tray (step 5932), the document feed flag is set to B (step 5933). If not, rotate the conveyor belt motor 305 forward (step 5).
934), starts timer B (step S
935). Timer B is set for a time period during which the document on the document glass (in the longest case) can be ejected. At the end of timer B (step 5936), the conveyor belt motor 301 is turned off (step 5937).

FIG. 23 shows the flow of the document size detection routine 5904. When the document detection sensor 311 turns ON (step 593B), timer DU is started (step 5939). Next, when the document detection sensor 311) passes the OFF edge, that is, the trailing edge of the document (step 5940),
), and stops the timer DU (step 5941).
, the value obtained by multiplying the current value by the document conveyance speed, that is, the length of the document, is stored in the A register (step 5942).

If the value of the A register is 182 (mm) or less (step 5943), it is determined that the document size is B10 (step 5944). Also, 210 (, nm
) or less (step 5945), it is determined that A, i side (step 5946), and furthermore, 257 (m
m) or less (Step 59 = 17), it is determined that it is B5 length (Step 5948), and if it is less than 297 (mm) (Step 5949), it is determined that it is A4 length (Step S950), 364 (mm). ) or less (step 5951), it is determined that it is B4.Step 5
952), and beyond 364 (+nm), A
3 (step S953).

In order to make this determination accurately, another sensor for determining the middle of the document is installed next to the sensor 310, and this ON/OFF
using the same length but different widths (e.g. A4b?r, A
5 vertical, etc.).

FIG. 24 shows the flow of the mode selection routine 5905.

When the mode select switch 320 is turned on,
ON S-JITTE (step 5954), LED3
20a is lit, that is, the automatic paper selection mode is selected (step S955), the automatic magnification selection mode is entered (steps 5956 and 5967), and the LE
When D320b lights up, that is, the automatic magnification selection mode is selected (step 5958), the mode is switched to manual mode (steps 5959 and 5960), otherwise, the automatic paper selection mode is switched (steps 5961, 5960).
5962) Switch each.

(Effects of the Invention) According to the present invention, the copy magnification determined by the original size and paper size can be corrected in the automatic magnification selection mode, so even in the automatic magnification selection mode, the copy magnification can be changed for each user. The copy magnification can be freely adjusted according to the user's preference or request, and the user can make copies at a more preferable magnification.

[Brief explanation of the drawing]

1 is a schematic cross-sectional explanatory diagram of an electrophotographic copying machine according to an embodiment of the present invention; FIGS. 2(a) and 2(b) are perspective views showing a mechanism for setting the paper color; The figure is a plan view of the operation panel of the copying machine, and Figure 4 is A.
A plan view of the operation panel of the DF, FIG. 5 is a circuit diagram showing the human output to the microprocessor CPUI that controls the main body of the copying machine, and FIG. 6 shows the human output to the microprocessor CPU2 that controls the optical system. The circuit diagram, Figure 7, shows the microprocessor CPL that controls the ADF.
8 is a flowchart of the main routine of the program that controls the copying machine, and FIGS. 9(a) and 9(b) are flowcharts of the paper selection subroutine, respectively. , Figure 10 is
Flowchart of subroutine for paper size code conversion, FIG. 11 is a flowchart of subroutine for change key processing, FIG. 12 is a flowchart of subroutine for changing APS magnification, FIG. 13 is a flowchart for subroutine for changing AMS magnification, Fig. 14 is a flowchart of the subroutine for starting ADP reservation, Fig. 15 is a flowchart of the subroutine for automatic paper selection, Fig. 16 is a flowchart of the subroutine for selecting paper size from the paper calculation table, Fig. 17(a) , FIG. 17(b) and FIG. 17(c) are the flowchart of the copy operation routine and the first
Figure 8 is a flowchart of automatic magnification selection routine.
- Figures 19 (a) and (b) show the automatic document feeder (A
FIG. 20 is a flowchart of the main routine of the program of the microprocessor CPU3 that controls the microprocessor CPU3.
21 is a flowchart of the subroutine for document feed processing. FIG. 22 is a flowchart of the subroutine for document ejection processing. FIG. 23 is a flowchart for the document size detection subroutine. is a flowchart of a mode selection subroutine. L... Copying machine main body, Lack... Photosensitive drum, 1
1... Original glass, 12... Exposure lens, 16
... variable magnification lens, 20 ... overprint paper cassette, 2
1... Draft paper cassette, 52... Paper empty display, 201... CPU that controls the copying machine main body. 300... Original transport unit, 310... Original size detection switch, 320... Mode select key, 320a... Automatic paper selection display LED, 40
1 to 404... One type of paper detection sensor, 410 to 4
17...Paper size detection sensor, 420.421
...Paper empty detection sensor, 501...A
PS change key, 502...A~IS change key, 503.504...Priority paper feed set key. Patent Applicant Minolta Camera Co., Ltd. Patent Attorney Aoyama Ao et al. 2 Figure 6 Figure 7 Figure 8 Figure 9 (b) Figure 10 Figure 11121 Figure 12 Figure 19 Figure 20 Figure 21rA 22a Figure 24

Claims (1)

[Claims] (1) A paper supply means that is equipped with a plurality of paper feed ports and supplies paper; a paper selection means that selects the paper feed port; and a paper supply means that creates an electrostatic latent image of the original on a photoconductor and Copying means using an electrophotographic method for transferring onto supplied paper; Original size detection means for detecting the size of the original; Paper size detection means for detecting the paper size selected by the paper selection means; an optimum copy magnification calculation means for calculating an optimum copy magnification from the document size information detected by the means and the paper size information detected by the paper size detection means; An electrophotographic copying machine equipped with an automatic magnification selection function, characterized in that it is equipped with a correction means for correction.