JPH0555865B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying apparatus that can change the size of a document according to the size of recording paper.

Conventional copying machines with such functions include:
There was one in which the length in the vertical direction and the length in the horizontal direction of the original image could be set arbitrarily, respectively, and the magnification ratio could be determined according to the set lengths and recording paper size.

However, in such a copying device, even if the original has been previously copied, each length must be set each time it is copied, and each length must be set accurately. Ta.

In contrast, the present invention provides a copying apparatus capable of variable-magnification copying, which includes a memory means (RAM) having first and second storage locations in which numerical data can be stored, and a variable-magnification copying device on recording paper. operating members 15X and 15Y that can set the length in the vertical and horizontal directions of the original image to be reproduced; a selection key (select key 2) for selecting either the vertical or horizontal direction; Instructing means SWX, Y for instructing storage of numerical data representing the length set by the operating members 15X, Y; a control means (microcomputer) for storing numerical data representing lengths in the vertical direction and horizontal direction of the document image set by the operating members 15X and 15Y in each of the storage positions; (microcomputer) is the operating member 1
If a storage instruction is given again by the instruction means SWX, Y after executing the storage process to store the numerical data representing the length set by the operation of 5X, Y, the storage location where the numerical data is already stored is By performing the storing process of storing numerical data representing the length set by a new operation of the operating members 15X and 15Y, the numerical data representing the already stored length is changed, and the numerical data representing the length set by the new operation of the operating members 15X is changed. , Y, the length of the document image in the direction selected by the selection key (select key 2) out of the lengths in the vertical and horizontal directions of the document image set by ) so that the selected key (select key 2)
The variable size copying is controlled in accordance with the numerical data representing the length stored in the first or second storage location according to the selection of the image data and the variable magnification rate based on the recording paper size.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a photosensitive drum which is rotated in the direction of the arrow by a motor (not shown). A photoreceptor 3 consisting of a conductive base layer, a photoconductive layer, and a transparent surface insulating layer is provided on the circumferential surface of the photoreceptor drum. The rotational speed of the photosensitive drum 1 is always constant during copying at the same magnification or variable magnification. The photosensitive drum 1 is first uniformly charged by a DC corona discharger 4, and then subjected to slit exposure of an image of the original O by an optical system to be described later. As a result, it receives corona discharge.

This discharger 5 is provided with a slit opening for passing the luminous flux. Then photosensitive drum 1
The entire surface is uniformly illuminated by the lamp 6, and a high-contrast electrostatic latent image corresponding to the original image is formed. This electrostatic latent image is visualized as a toner image by the developing device 7, and then the toner image is transferred to the paper P conveyed to the circumferential surface of the photosensitive drum. After the transfer, the paper P is separated from the circumferential surface of the photosensitive drum by a separating claw 9 and then guided to a fixing device 10, where the toner image is fixed. On the other hand, the residual toner image is removed from the circumferential surface of the photosensitive drum after the transfer by a cleaning device 11, and the photosensitive drum is prepared for the next copying operation. A paper P of a size selected according to the copying magnification and the area to be copied is not shown.

One sheet from the paper feed cassette for that size is conveyed by the conveyance means 12 through the guide 13 toward the transfer position.

The original O is placed on the upper surface of the transparent original platen 32, and the first mirror 33 and the first mirror 3 are placed on the transparent original table 32 from the bottom.
An optical system consisting of a second mirror 34 moving at a speed of 1/2 of 3 and an illumination lamp 35 scans in the direction of the arrow.

In this case, the illumination lamp 35 is preferably supported on the same support base as the first mirror 33. First mirror 33
The moving speed is the weekly speed of the photosensitive drum 1 multiplied by the copying magnification, that is, the reciprocal of the imaging magnification of the imaging lens 36. To change the magnification, it is necessary to change the optical path length between the lens and the document and between the lens and the photoreceptor, but here, when copying at the same magnification, the lens, third and fourth mirrors 37 and 38 are at the solid line position. , m<1, that is, in the case of reduced copying, the relative positional relationship of the first and second mirrors 33 and 34, which are the scanning optical system, is changed and the imaging lens 36 is moved to the 36'' position.1. In the case of magnification copying, the imaging lens 36 is moved to the 36'' position, and the third and fourth mirrors 37 and 38 are moved to the 37' and 38' positions to change the optical path lengths. Expansion or reduction is possible by changing .

Note that the lens, third and fourth mirrors are fixed and do not move while the first and second mirrors 33 and 34 are being scanned. 8 is a pulse motor for moving the lens 36 and the mirror system 37, 38 according to the magnification.

Figure 2 is a schematic diagram for measuring the size of an original-sized image placed on the original glass surface, and shows the effective original area in the vertical direction (hereinafter referred to as the Y direction) and the horizontal direction (hereinafter referred to as the X direction). Each indicator lever 15X, 15
A Y is provided along the guide. (however
Starting from X _O and Y _O. ) This indicator lever 15X,
A wire 16 is fixed to 15Y, pulleys 14a and 14b are connected to the X direction, and pulley 14 is connected to the Y direction.
The wires are indicated by c and 14d. The pulley 14a is equipped with a potentiometer 1 that responds to rotation.
7X is installed.

Also, similarly in the Y direction, use a potentiometer 17X.
is attached. The relationship between this potentiometer 17X and pulley 14a is that lever 15X is
When moving from X _O → X _M , potentiometer 17X
The pulley 14a and the potentiometer 17X are mechanically connected to each other so as to rotate 10 times. The same applies to the Y direction.

FIG. 3 is a schematic block diagram of this embodiment, showing the indicator levers 15X, 15Y and the potentiometer 17.
This shows electrical connections with X and 17Y. X
Regarding the direction, as the instruction lever 15X moves, the wire 16 moves in conjunction with the pulleys 14a,
14b to rotate the potentiometer 17X. Voltage V (V) is applied to the potentiometer 17X, and the output is from the indicator lever 1.
A voltage proportional to the movement of 5X is generated. This voltage is converted into an A/D (analog/digital) converter 18
The data is digitally converted using X and inputted to a microcomputer (hereinafter referred to as μCOM) 19 to calculate the instruction lever position. The same process is performed in the Y direction.

The calculation result is input to the main control circuit 22 of the copying machine to perform the desired variable size copying.

FIG. 4 is a more detailed version of FIG.
An outline of the internal configuration of μCOM 19, which is the main body of this embodiment, is shown. This is 4bit for input only ports A to G.
It is made in bits. It can be read bit by bit, and it is also possible to read 4 bits at the same time in parallel, and each bit has a binary representation.

That is, weights of 1, 2, 4, and 8 are assigned in the order of A1→A4. In addition, the output ports H to N ports are also configured in 4-bit units, and can be set/reset in bit units.
0" and can set and reset 4 bits in parallel at the same time. Furthermore, it has a latch type configuration. Loads are attached to these input/output ports and processing is performed by a program.

A 9-bit A/D converter 18X is attached to the A, B, and C1 ports, and converts the analog voltage generated from the potentiometer 17X into digital. When converted to 9bit, it is 512 (10
If you combine them so that the relationship is 1 bit = 1 mm, you can read up to a 512 mm original with a resolution of 1 mm. Similarly, a 9-bit A/D converter 18Y is attached to the D port, E port, and C4 port, and reads the document in the Y direction based on the output from the potentiometer 17Y.

Similarly to the above, the relationship of 1 bit = 1 mm is established in the control calculation.

A position pulse generating photo interrupter (hereinafter referred to as P, I) 23 for detecting the position of the optical system for variable magnification is connected to the C2 port, and it is possible to know in what position the optical system is set. It is for. This pulse creates a signal by means of a disk that generates pulses that are relevant to the movement of the optical system. For example, if the reduction ratio is 0.5 in the X or Y direction, the disk rotates to the left and generates 50 pulses.
Also, if the X or Y direction is a magnification of 1.5,
Under magnification, the disk is rotated clockwise and adjusted to generate 50 pulses.

The selected paper size is input to the G port and is encoded.

This code is determined to be, for example, the code shown in FIG. 26 converts the paper size signal to 4 bits16
→It is a quaternary encoder.

A group of operation switches (hereinafter referred to as SW) 27 is input to the F port, and when SWX is pressed by the SW for reading the document in the X direction, "H" is input to the F4 port, and the potentiometer 17X,
This gives an instruction to read data from the A/D converter 18X. Similarly, SWY is also used to read the Y direction.

SWM is an instruction SW for calculating the magnification and setting the variable magnification system at the calculated position. Completion SW
is an instruction SW to output the document size and set magnification as data to the control μCOM 22 of the copying machine, and is performed by the μCOM 19 to give information that can be shared to the μCOM 22. Here, the order of operations in SW group 27 is SWX
Alternatively, the order is SWY, SWM, and completion SW.

The 1 port and the J3 and J4 ports are timing signals that generate outputs as shown in FIG. 13 to dynamically light up the display 20.

The data on the display 20 is outputted from the K port as shown in FIG.

The J1 and J2 ports are for moving the optical system to a predetermined position using the pulse motor 8.
generates a signal for clockwise rotation R, and J2 generates a signal for counterclockwise rotation L, and provides the signal to the pulse motor drive circuit 30. OSC is input to the pulse motor drive circuit,
This determines the driving frequency of the pulse motor. (In this example, a pulse motor was used, but
If the motor can be forward-reversed, it can be used.
Needless to say. Also, depending on the drive mechanism, a motor that cannot be rotated in forward or reverse directions may be used. ) From the N port, the magnification M is sent serially in three digits as shown in FIG. 14: upper, middle, and lower.

From the M, L, ports, the document size is X, respectively.
This is the same type as the magnification M and sends out Y at the same time.

The P.I 24 is for detecting the same magnification position (hereinafter referred to as 1:1 position).

Next, the flow chart from FIG. 5 onwards will be explained.
Turn on the power switch, and in step 1 clear the contents of RAM (random access memory) and clear the I/O
(I/O) Resets the output of the port.

Drive the pulse motor to set the 1:1 position to P.
By detecting it with the I sensor 24 and reading the C3 port, the optical system is set to the 1:1 position and the pulse motor is turned off.

Step 2 sets RAM. RAM has a 4-bit configuration. 12bit from address 1 to 3
Store the document size in the X direction in 3 digits in decimal format. Let this name be X.

In step 1, this value contains the initial value of X=0.00 (because it has not been read yet). At the same time, in the Y direction, three digits are secured at addresses 4 to 6 under the name Y. Addresses 25 to 27 are for storing values representing the lens position in pulses.The name is PLS, and the 1:1 position is PLS =
Set to 1.0.0. When the reduction ratio is 0.70, the point moved by 30 pulses becomes PLS = 0.7.0, and when the magnification ratio is 1.41, when the point is moved by 41 pulses at PLS = 1.4.1, it is doubled. At RAM addresses 28 to 30, the desired magnification is stored in three digits. Let this name be M.
In step 2, M=1.0.0.

Display data in units of 3 digits is expanded to addresses 33 to 35 and 36 to 38, respectively. In step 2, the data of FFF, 1.0.0 is initially set. The segment decoder driver is a code that does not light up at any F input.

In step 3, the data on the display ram is processed by the subroutine named subDPY, and the display 20 is displayed as bbb, 1.0.0 (b means blank. Hereinafter referred to as bbb), and the 1:1 ratio is Indicates that it is set to the magnification position. If nothing else, the first
It is displayed at the timing shown in Figure 3. Operation switch
When either SWX or SWY is pressed in group 27, an interrupt is generated at the μCOM interrupt terminal iNT, and the process proceeds to step 4.

In step 4, it is determined whether the F1 bit of the F port is "1". That is, it determines whether the completion SW is pressed, and if it is pressed, it proceeds to step 5 and executes the subroutine name subSET that sends data to μCOM22.
Return to step 3. Sub “SET” will be described later.

If it is not the completion SW, proceed to step 6 and check whether it is the F2 port, ie, SWM. Because it is SWM
Proceed to step 7, read the paper size loaded in the copying machine, and write 3 with the name x in RAM addresses 9 to 11.
Store the name y in digits 12 to 14 in 3-digit decimal format. Then, in step 8, calculate the magnification and send the result to
Store x/X in 3 digits in RAM addresses 17 to 19 and y/Y in 3 digits to addresses 20 to 22, compare x/X and y/Y, and select the smaller value in addresses 28 to 30. Store 3 digits of name M in the address. Then proceed to step 9.

In step 9, the number of pulses to be moved is determined based on the calculated magnification, and when the optical system is moved to a desired position, the display ram is set to display at a predetermined magnification. As a result, bbb and NNN magnifications are displayed on the display.

If F2 port ≠ 1, proceed to step 10 and check whether SWY is installed. When SWY is pressed, F3 port ≧1 is input, so read the Y coordinate with subroutine name subR.Y and store it in Y of RAM as 3 digits.

If F3 port ≠ 1, proceed to step 11 and check whether F4 port = 1. If SWX is pressed, read the X coordinate and store it in X of RAM as 3 digits.

If F4 port ≠ 1, this means that an interrupt has occurred even though there was nothing, which is impossible in terms of operation. Therefore, something abnormal is occurring. It may also be due to a malfunction, so start over from the initial settings again.

Figure 6 shows a subroutine that performs display processing.
It indicates subDPY and is located at RAM address 39 with the name N and 0.
-5, and control the outputs of the i port and J port shown in FIG.

That is, when N=0, a To signal is generated at the i4 port,
The value of data address 33 at the time of To is output to the K port. The topmost part of the display is displayed by the outputs of i4 and K port. Similarly, when N=1, i3 and K
Display by port and do the same as above to set J3 and K with N=5
The lowest level is displayed by the port and returned to N=0.
This process is repeated to generate output with the timing shown in FIG.

FIG. 7 shows a subroutine "sub paper size" for storing the paper size. The coded signal (code table shown in FIG. 12) is read from the G port and the result is stored in RAM address 8. According to this content, if the code is O, the paper is set for A3 vertical feed, so 297 is stored in memory addresses 9 to 11 and name x for storing the paper size. 420 is stored in addresses 12 to 14 with the name y. The RAM in FIG. 12 shows the case of code 6, and shows A4 horizontal feeding.

FIG. 8 shows the subroutine sub magnification.

In this subroutine, the ratio of each side is calculated, that is, x/X or y/Y, since the entire image content is included in the paper based on the values of document size X, Y and paper size x, y stored in the RAM. In the example in Figure 12, X=420mm, Y=297mm, x=297mm,
Since y=210mm, both x/X and y/Y are 0.70.
I remember it as 0.7.0. In this case, exactly x/X
Since ≧y/Y, the value of y/Y is transferred to M in RAM.

FIG. 9 shows a subroutine for moving the lens system and displaying the magnification.
The value obtained by subtracting the contents of PLS from the contents of M is written to RAM addresses 41 to 43 with the name CNT. In the state shown in FIG. 13, M-PLS=70-100=-30, so CNT=-30. Next, whether the CNT is positive or negative determines whether the pulse motor rotates to the left or to the right. It is configured so that if it is positive, it rotates to the right (direction of expansion), and if it is negative, it rotates to the left (direction of contraction). If it is negative, take the absolute value of CNT, rotate the pulse motor counterclockwise, count the number of pulses coming in from the C2 port, and move the pulse motor until CNT becomes 0. When CNT=0, turn off the pulse motor and transfer from M to PLS for the next time. That is, M=0.7.0 and PLS=0.7.0.

To display the magnification, transfer the value of M to addresses 36 to 38, put FFF in addresses 33 to 35, and select bbb, N.
Display NN (magnification).

FIG. 10 shows subroutines subR.X and subR.Y. subR.X reads 9bit A/D conversion data from A port, B port, and C1 port, and
Convert to decimal and store in 3 digits in X of RAM. or
subR.Y reads 9-bit A/D conversion data from the D port, E port, and C4 port, converts it to decimal, and stores it in Y of RAM as 3 digits.

FIG. 11 shows the subroutine subSET.

In this subroutine, document size XY and magnification M
Serially from the upper digit, N port, M port,
Send 3 digits with a 50ms width pulse from l port.

In the embodiment described above, the magnification ratio is automatically determined by determining the document size X, Y and the paper size x, Y. However, the subroutine name in FIG.
By providing the flowchart shown in FIG. 15 instead of sub.magnification, it is also possible to arbitrarily determine the magnification based on the vertical width or horizontal width of the paper.

A more detailed explanation of FIG. 15 is as follows. By operating the select key 1, the auto select (corresponding to the sub. magnification in FIG. 8) which automatically selects the standard width of paper, or the select key 2 is selected.

When autoselect is selected, the standard paper width is selected based on both the original size and the paper size, and the magnification ratio is determined, as described above. When the select key 2 is selected, by further operating the select key 2, a variable size copy can be obtained based on either the vertical width or the horizontal width of the sheet.

If the vertical width is selected as the standard, the y/Y value will directly be the scaling factor, so the RAM address 28
Transferred to address 30. Also, if the width is selected as the standard, x/X is the scaling factor, so
Transferred to RAM addresses 28 to 30.

Therefore, by providing the select key 2, it is possible to arbitrarily obtain a variable size copy based on the vertical width or the horizontal width of the sheet.

In the above explanation, the magnification ratio is determined by the original size and paper size, but by providing a switch for selecting a preset magnification ratio, it is also possible to obtain a variable-reduction copy with a desired magnification. be.

Further, although the above embodiment is for changing the magnification at the same ratio of vertical and horizontal, as another embodiment, each ratio of the vertical and horizontal corresponding to the document size and the paper size is determined,
By using each value as a scaling factor independently in the X direction and the Y direction, it is possible to convert a modified size document into a standard size document.

As a specific example, when transmitting the value of RAMM in the subroutine SET of FIG. 11, the magnification x/X in the scan direction, that is, the X direction, is output from the N port,
The copy control circuit 22 reads this output signal and
By selecting the slit exposure speed according to the value and setting the Y direction to the variable magnification of the optical system,
A copy of a modified original can be made on the entire surface of the paper.
Further, the speed of the photoreceptor may be changed while keeping the exposure speed constant, corresponding to the magnification change ratio in the exposure direction.

Further, in the case where a pulse motor is used in the above embodiment, the photo interrupter 23 may not be provided, and in this case, the necessary number of pulse motor drive pulses can be outputted from the output ports J1 and J2 of the control microcomputer 19. Good.

As explained above, in this embodiment, it is possible to obtain a variable-size copy based on the vertical width or horizontal width of the paper depending on the purpose of use.

Furthermore, since there is no need to calculate the magnification ratio each time, even a deformed original can be easily converted to a standard size.

Therefore, according to the present invention, the operating member is stored in each of the first and second storage positions of the memory means in response to an instruction from the instruction means that instructs storage of numerical data representing the length set by the operating member. By storing numerical data representing the vertical and horizontal lengths of the original image set by , the lengths of the original image in the vertical and horizontal directions required for variable size copying can be stored in advance before copying. It can be stored in a device.

Therefore, according to the present invention, it is possible to save the effort of setting these data each time copying is performed.

Further, according to the present invention, when the instruction means issues a storage instruction again after executing a storage process for storing numerical data representing the length set by the operation of the operating member, the numerical data has already been stored. The stored numerical data can be changed by performing a storage process to store numerical data representing the length set by a new operation of the operating member at the current storage location.

Therefore, according to the present invention, it is possible to cope with changes in the original image to be reproduced by changing the magnification while saving the storage capacity of the memory means.

Further, according to the present invention, the length of the original image in the direction selected by the selection key of the vertical direction and the horizontal direction of the original image set by the operation member is changed to the length of the original image in the direction selected by the selection key of the storage paper. The magnification is changed based on the numerical data representing the length stored in the first or second storage location according to the selection of the selection key and the storage paper size so that the magnification is changed and played according to the length. Therefore, by controlling the variable size copying, it is possible to perform variable size copying based on any one of numerical data representing the length in the vertical direction and the horizontal direction stored in advance.

Therefore, according to the present invention, if the original image to be reproduced by changing the size is a vertically long image, in order to change the size to match the recording paper size, the length of the original image must be set in the vertical direction. Furthermore, if the image is horizontally long, the length of the document image can be set in the horizontal direction, and the operation for setting the length of the document image can be simplified.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a copying machine, Fig. 2 is a layout diagram for size detection, Fig. 3 is a main electrical block diagram of the present invention, Fig. 4 is an electrical circuit diagram realizing the present invention, and Fig. 5 is a flowchart, Figures 6 to 11 are subroutine flowcharts, and Figure 12 is a flowchart.
RAM map and paper size correspondence code list, Figure 13 is a display timing chart, Figure 14 is a time chart for sending the document size and magnification to the copier, and Figure 15 is a subroutine to explain another embodiment. It is a flowchart. In the figure, 11 is a photosensitive drum, 3 is a photosensitive member, and 8
is a pulse motor, 32 is a document table, 15X, 15Y
1 is an indicator lever, 17X and 17Y are potentiometers, and 19 is a microcomputer.

Claims (1)

[Scope of Claims] 1. A copying apparatus capable of variable-magnification copying, comprising: a memory means having first and second storage locations capable of storing numerical data; and an original image to be reproduced with variable magnification on recording paper. an operating member that can set the length in the vertical and horizontal directions; a selection key for selecting either the vertical or horizontal direction; and a numerical data representing the length set by the operating member. an instruction means for instructing storage, and a lengthwise and horizontal length of the document image set by the operation member in each of the first and second storage positions of the memory means in accordance with the instruction from the instruction means; and a control means for storing the numerical data representing the length, and the control means executes a storage process for storing the numerical data representing the length set by the operation of the operating member, and then the control means stores the numerical data representing the length set by the operation of the operating member, and then the control means stores the numerical data representing the length set by the operation of the operating member. When a storage instruction is given, the storage process is performed to store the numerical data representing the length set by the new operation of the operating member in the storage location where the numerical data is already stored. of the length in the vertical and horizontal directions of the document image set by the operating member, the length of the document image in the direction selected by the selection key is changed so that the length of the document image in the direction selected by the selection key is A numerical value representing the length stored in the first or second storage location according to the selection of the selection key so that the length is scaled and reproduced according to the length in the direction selected by the selection key. 1. A copying apparatus characterized in that variable-magnification copying is controlled according to a variable-magnification ratio based on data and recording paper size.