JPH0643946A - Power unit - Google Patents

Abstract

PURPOSE:To prevent electricity from being fed in an abnormal load state such as a short circuit, an open circuit, and an intermediate short/open-circuit state by limiting a current flowing to a load so that the detected value of the current to the load is within a specific deviation from a target current value. CONSTITUTION:When the power switch 75 of a copying machine is turned ON, AC electric power is supplied to a stabilized power source 85 through a transformer 87 to generate and apply the power source (voltage 5V) of a control system necessary for a CPU 24, etc. Thereby, the control procedure of the CPU is executed. A rectifying and smoothing circuit 77 consists of a diode and a capacitor for converting an AC voltage into a DC voltage. A three- terminal regulator 78 controls the voltage of a control output so that the terminal of a remote terminal has an invariably constant value. A voltage level converter 80 matches the voltage across a resistance 79 with the input voltage range of the input terminal of A/D conversion of the CPU 24. A switch 84 controls a current to a relay 83 with the signal of the CPU 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for operating a load, and more particularly to a power supply device for detecting an abnormality of the load when the power is turned on.

[0002]

2. Description of the Related Art Conventionally, when a load connected to a power supply unit is abnormal (short circuit of load), a fuse in series with the load is blown or a breaker is cut off, and excessive current continues to flow. When the power supply device is interrupted or an overcurrent detection circuit is added to the power supply device and the overcurrent flows, the protection circuit in the power supply device operates so as to reduce the output voltage. However, when the load is not a complete short circuit or when the load is open, it cannot be detected.

[0003]

However, in the above-mentioned conventional example, when the load is completely short-circuited, a large current instantaneously flows, the fuse is blown, the breaker is cut, and the protection circuit operates. , It is possible to protect the load by lowering the output voltage, but if the load is not completely short-circuited (for example, the rating of fuses and breakers, the amount of current that flows is less than the starting current value of the protection circuit). In this case, the fuses are not blown and the breakers are not blown, and the overcurrent protection circuit does not operate. Therefore, there is a drawback that a load abnormality cannot be detected or dealt with. Therefore, if the load is not completely short-circuited, abnormal current continues to flow in the load, causing the load to overheat, producing smoke, or in the worst case,
There was a risk of fire. In addition, when the load is open, it is basically impossible to detect it, and the load is operated to detect its abnormality (open). In some cases,
It had the drawback of destroying the load. Therefore, an object of the present invention is to provide a power supply device that solves the above problems.

[0004]

To achieve the above object, the present invention provides a current detecting means for detecting a current flowing through a load, and a value obtained by the current detecting means when the power is turned on. And a control means for limiting the current flowing through the load when the deviation from the target value is not within the predetermined deviation range.

[0005]

According to the present invention, when the power is turned on, the load is checked for abnormalities (short circuit, open circuit, intermediate short circuit / open circuit) to prevent energization while the load remains abnormal.

[0006]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 4 shows the reading range of a document and the printing range on a sheet at the time of zooming.
6 shows the main configuration of the color copying machine, FIGS. 6 and 7 show the order in which an image is formed on the paper, and FIG. 8 shows the main scanning / sub scanning of the reader / printer. FIG. 9 shows a block diagram of what is necessary to control the scanning operation, and FIG. 9 shows an example of the configuration and scaling necessary for scaling the image signal read by the reader. FIG. 11 shows an example of the operation unit of the copying apparatus, FIG. 12 shows an example of the operation unit of the editing apparatus, and FIG. 15 shows a CPU peripheral circuit in the copying apparatus. FIG. 26 shows a configuration of a block, a CPU peripheral circuit in the editing device, and a communication circuit for exchanging information between the CPU in the copying device and the CPU in the editing device.
2 is a diagram showing a configuration of an image signal processing circuit in a color copying machine and an editing apparatus using an inkjet.

In each of the above figures, reference numeral 1 denotes a document,
A CCD for converting the information of the original into an image signal (analog value) of R (red), G (green), and B (blue), 2 is a photo interrupter for detecting the reference position of the main scanning of the reader, and 3 is the reader. Photointerrupter for detecting the sub-scanning reference position, 4 is a stepping motor for moving CCD 1 in the main scanning direction, 5 is a belt for connecting CCD 1 and motor 4, and 6 is a pulley and a pulley shaft for applying tension to belt 5. , 7 is a plate on which the main scanning components (1, 2, 3, 4, 5, 6) of the reader are mounted, 8 is a belt for connecting the plate 7 and the motor 9, and 9 is a plate on which the main scanning components are mounted. Stepping motor for moving in the sub-scanning direction, 10 is a photo interrupter for detecting the reference position of the main scanning of the printer, 11 is the presence / absence of paper of the printer
A photointerrupter for detecting nothing and the reference position of the paper (the leading edge of the paper), and 12 for printing C (cyan), M (magenta), Y (yellow), and K (black) inks on the paper. , A print head composed of 100 nozzles for each color, 13 a pulley and a pulley shaft for applying tension to the belt 14, 14 a print head 12 and a head connecting a motor 15 for moving the print head 12, 15 a print A stepping motor for moving the printing head 12 in the main scanning direction of the printer, 16 is a roller for pressing the leading edge of the paper and transporting the paper, 1
7 is a roller for pressing the rear end of the sheet and conveying the sheet, 18 is a belt connecting the roller 16 and the motor 20, 19 is a belt connecting the roller 17 and the motor 20,
20 is a stepping motor for moving the paper 23 in the sub-scanning direction of the printer, 21 is a color copying machine main body, 2
2 is a manuscript, 23 is a paper, 24 is a CP for main scanning of a reader / printer, drive / position control of a sub-scanning motor, key input, LED display, and communication with an editing device
U, 25 to 28 are motor drivers for supplying electric power to the main scanning and sub scanning motors of the reader / printer based on the control signals of the CPU 24, and 29 is a write address for storing image data in the image memory 32. A block to be generated, 30 is a block to generate a read address when the image data is loaded into the image memory 32, 31 is a selector for selecting one of the addresses of the RAM 32 depending on the read / write selection state of the block 33, 32 is a RAM as an image memory for storing image data, 33 is a write signal for storing the image data in the RAM 32, a block for generating a read signal for loading, and 34 is a block 33 for writing. Input image signal while signal is being output Sent to the RAM32 data bus, when the block 33 has issued a read signal, R
A selector for selecting the flow of the image signal so that the signal on the data bus of AM32 becomes an output image, 50 is an AD converter for converting the analog image signal obtained by the CCD 1 into a digital image signal of 8BiT, 51 is shown in FIG.
By the method shown in FIG. 5, a variable magnification block for reducing / enlarging an image, 52 is for reducing the influence of variations in the sensitivity of each image of the CCD 1 and variations in the brightness of a lamp (omitted in the present invention) for illuminating a document. Further, a shading correction circuit for correcting the image signal, 53 is an image signal selector for selecting one of the image signal of the original obtained by the CCD 1 and the image data previously stored in the image memory 101, and 54 is an R (red) signal. ), G (green),
A logarithmic converter for converting B (blue) image data into C (cyan), M (magenta), and Y (yellow), and 55 is a color output characteristic of the CCD 1 as an image reading sensor and a printing ink. In order to match the color characteristics of the color correction circuit, a color correction circuit for correcting the image signal, 56 represents multi-valued data (image signal) of 8 BiT and 2 of 1 BiT.
A binarization circuit for converting into value data, numeral 57 is a binarization circuit 5
12 based on 1BiT binary data obtained in 6
, A print head driver circuit for supplying electric power to the print head, and an image clock (1T, 2T, 4T, 8T) and an image identification signal (V) which form the relationship shown in FIGS.
E, BVE) generating circuit, and 59 is an image clock for selecting either the image clock and the image identification signal generated by the circuit 58 or the image clock and the image identification signal output from the image memory 101 of the editing apparatus. An image identification signal selector 60 is an image signal, an image clock, an image identification signal, and a CPU 24 for the copying apparatus and a CPU 100 for the editing apparatus, from the copying apparatus to the editing apparatus and from the editing apparatus to the copying apparatus.
Interface (IF) connector for connecting a signal line for passing information between the two, and 61 is a key input unit (reference numerals 67 to 7 in FIG. 11) in the operation unit 66 of the copying apparatus.
2), 62 is a display unit (reference numerals 73 and 74 in FIG. 11) using an LED in the operation unit 66 of the copying machine, 63 is a notification to the editing apparatus that the copying machine is powered on (5V etc.), A transistor for generating a copy device connect (FCNT) signal, 64 is a resistor for determining the base power supply of the transistor 63, and 65 is an edit device connect (HCNT) when nothing is connected to the IF connector. ) A pull-down resistor for setting the signal line to the ground level, 67 is a minus key for reducing the number of copies set, 68 is a plus key for increasing the number of copies set, and 69 is forcibly interrupting the operation during copying. A stop key 70, a copy key 70 for setting the start of copying, and a copy key 71 for reducing the copy density in the copying machine. Constant key 72 is set key for darker copy density in the copying apparatus, 73 a display unit using a 7-segment LED to display a copy setting number, 74
Is a display unit for displaying the set value of the copy density of the copying machine, 75 is a power switch, 76 is a fuse, and 77 is a rectifying / smoothing circuit composed of a diode and a capacitor for converting an AC voltage into a DC voltage. Reference numeral 78 is a three-terminal regulator that controls the voltage of the control output so that the voltage at the remote terminal is always a constant value, 79 is a resistor for detecting the current flowing in the load, and 80 is a resistor across the resistor 79. A voltage level converter for adjusting the voltage to the input voltage range of the A / D conversion input terminal of the CPU 24, 81 is a C
A switch for passing a current to the load 82 or turning off the current according to a signal from the PU 24, 82 is a load (solenoid, fan, etc.) connected to the output end of the power source, and 83 is an ON / OFF switch for the output of the transformer 86. A relay composed of a relay contact 83A and a solenoid 83B for turning on, 84 is a switch for turning on and off the current to the solenoid 83B of the relay 83 according to the signal of the CPU 24, and 85 is for the CPU 24 and the relay 83 5V
Stabilized power supply to generate voltage, 87 is AC voltage (commercial)
Is a transformer for converting to an intended AC voltage.

Reference numeral 100 denotes a CPU for key input of the editing apparatus, LED display, communication with a copying apparatus, and change / modification of the image data in the image memory 101. Reference numeral 102 denotes an operation unit 108 (FIG. 12) of the editing apparatus. A certain key input unit (109 to 113 in FIG. 12) and 103 are operation units 1 of the editing apparatus.
The display unit using the LED in FIG.
17) and 104, as shown in FIG. 15, a transistor for generating an edit device connect (HCNT) signal for notifying the copying device that the power (5V etc.) of the edit device is on, and 105 is a transistor 104. A resistor for determining the base current, 106 is a pull-down resistor for setting the copying machine connect (FCNT) signal line to the ground level when the copying machine is not connected to the IF connector 60, and 107 is an editing apparatus (FIG. 10). , 108
Is an operation unit of the editing apparatus, 109 is a setting key for reducing the copy density in the editing apparatus as shown in FIG.
0 is a setting key for increasing the copy density in the editing device, 111 is a key for selecting a mode for color conversion from R (red) to G (green), and 112 is R (red).
Is a key for selecting a mode for color conversion to B (blue), 113 is a key for selecting a color conversion mode for printing the entire image only in R (red), and 114 is a set value of copy density of the editing device. Is a display unit for displaying
The LED display section indicates that the mode for color conversion of (red) into G (green) is selected, and 116 indicates that the mode for color conversion of R (red) to B (blue) is selected. LED display unit 117 displays the entire image as R
It is an LED display section showing that the color conversion mode in which only (red) is printed is selected.

Next, the relationship between the image identification (effective) signal, the image data, and the image clock in the above configuration will be described with reference to FIGS. 13 and 14.

In the text, the pixel alignment direction of the CCD 1 as an image reading sensor and the print head 12 are used.
The nozzle alignment direction is defined as the sub-scanning direction, and the signal name is VE. The H level of VE corresponds to the effective image range in the sub-scanning direction. A direction in which the CCD 1 moves while reading an image and a direction in which the print head 12 moves while printing data on a sheet are defined as a main scanning direction, and a signal name is BVE. The image effective range in the main scanning direction is BV
The H level of D corresponds.

The BVD signal changes at the rising edge of VE and changes to H
The level time (image effective range) changes depending on the original, paper width, magnification, etc. The VE signal changes at the rising edge of 1T,
The H-level time (image effective range) is determined by the number of pixels of the image reading sensor and the number of nozzles of the print head.
1T, 2T, 4T and 8T are image clocks, 1/2 cycle of 1T is 2T, 1/2 cycle of 2T is 4T and 1 of 4T.
/ 2 cycle is 8T. In the image signal VD, one pixel is composed of R, G, B and X components. R is a red signal, G is a green signal, B is a blue signal, and X is a black signal. The X signal is generated by the color correction circuit 55,
It is set in the image signal. Further, one cycle of 4T has the same time as the components of R, G, B, and X. Further, when 1T and 2T are H level, R signal, 1T is H level, when 2T is L level, G signal, 1T is L level,
When 2T is H level, it is B signal, and when 1T and 2T are L level, it is X signal.

The relationship between the image data (VD) and the image clock between the copying apparatus and the editing apparatus is as shown in FIG. 24, and FIG. 25 shows the image clock generating circuit in the editing apparatus.

Next, in the above-mentioned configuration, the image reading range and the printing range take a maximum of 100 pixels in one main scan, and the operation will be described below based on the flow of FIG.

(F-1) When the copy button 70 (see FIG. 11) is pressed to start copying, as shown in FIG.
First, since the reading sensor (CCD 1) of the reader moves to the main scanning and sub scanning reference positions (main scanning position sensor 2, sub scanning position sensor 3), the main scanning motor 4 and the sub scanning motor 9 of the reader are rotated. Like, CP
A signal is applied from U24 to the motor driver 27 to move the motor driver 27 to the reference position, and the process proceeds to F-2.

(F-2) Printer print head 12
Is moved to the reference position by applying a signal from the CPU 24 to the motor drivers 25 and 26 so as to move to the sub-scanning reference position of the printer (the point where the print head crosses the photo interrupter 10 as the sub-scanning position sensor). . Next, the copy paper 23 is fed, and the paper feed roller 17 is rotated until the paper crosses the photo interrupter 11 as a paper detection sensor. After the paper is detected by the photo interrupter 11, the paper 23 is further detected.
Feed a fixed amount, set the paper as shown in FIG.
Go to 3. The rollers 16 and 17 for feeding the paper feed the paper 23 by rotating the motor 20 for feeding (sub-scanning) the paper of the printer via the belts 18 and 19. The motor 20 rotates by applying a signal from the CPU 24 to the motor driver 28.

(F-3) It is judged whether the copy magnification set in advance before the copy is started is the reduction copy or the enlargement copy. When the reduction copy is performed, the process proceeds to F-10. At the same size copy and enlarged copy, the process proceeds to F-4 and is executed.

(F-4) The following processing is stored in the CPU 24 so that the CPU 24 operates based on the maximum writing range in the sub-scanning direction of the printer (100 pixels for each of cyan, magenta, yellow, and black), and F Go to -5.

(F-5) The number of pixels in the maximum writing range of the printer is divided by the magnification, and the result is multiplied by 100 to obtain the number of pixels in the reading range of the reader. For example,
Regarding 200% in Fig. 4, 100/200 x 100
= 50, and when the enlargement is 200%, the range pixel number 50 required for reading by the reader is obtained, and the process proceeds to F-6.

(F-6) The reader and the printer are each scanned one by one in the main scanning direction, the information on the original 22 is read by the reader, the information read on the paper 23 is written, and F-7.
Go to.

(F-7) It is judged whether the scan in the main scanning direction carried out in F-6 is the final main scanning of the copy. If the final main scanning is performed, the process proceeds to F-16 to end the copying.
If it is not the final main scanning scan, the process proceeds to F-8.

(F-8) The position of the reading sensor (CCD1) of the reader is moved in the sub-scanning direction by the number of pixels obtained by the calculation of F-5, and in the main scanning of the next reader,
Since the reading sensor is moved to the position where the image is read, C
A signal is applied from the PU 24 to the motor driver 26, the motor 9 for driving the sub-scanning of the reader is rotated a necessary number of times, and the process proceeds to F-9.

(F-9) Set the printer paper position to 10
To move the print head to the position where an image is written in the main scan of the next printer by moving it by 0 pixels in the sub scan direction,
A signal is applied from the CPU 24 to the motor driver 28,
The motor 20 for driving the sub-scan of the printer is rotated, the process returns to F-6, and the above process is repeated as many times as necessary.

(F-10) In order to operate the following processing with the maximum reading range of the reader in the sub-scanning direction (100 pixels for each of red, green and blue) as a reference, the CPU is operated.
Store in 24 and proceed to F-11.

(F-11) The number of pixels in the reading range of the printer is obtained by multiplying the maximum number of reading range pixels of the reader by a magnification and dividing the result by 100. For example, for 50% of Fig. 4, 100/100 x 50
= 50, and when the reduction is 50%, the range pixel number 50 in which the printer writing is performed is obtained. For 75%, 100/100 × 75 = 75, which is a reduction of 75
When it is%, the range number 75 in which the printer writing is performed is obtained, and the process proceeds to F-12.

(F-12) The reader and the printer are each made to perform one scan in the main scanning direction, the information of the original 22 is read by the reader, the read information is printed on the paper 23, and F
Go to -13.

(F-13) It is judged whether the scan in the main scanning direction performed in F-12 is the final main scanning of the copy. If the final main scanning is performed, the process proceeds to F-16 to end the copying. If it is not the final main scanning scan, the process proceeds to F-14.

(F-14) The position of the reading sensor (CCD1) of the reader is moved by 100 pixels in the sub scanning direction, and the reading sensor is moved to a position where the image is read in the main scanning of the next reader. A signal is applied to the driver 26, the motor 9 for driving the sub-scanning of the reader is rotated a necessary number of times, and the process proceeds to F-15.

(F-15) Set the position of the printer paper to
The CPU 24 applies a signal to the motor driver 28 to move the print head to a position where an image is written in the main scanning of the next printer by moving the pixel in the sub-scanning direction by the number of pixels obtained by the calculation of F-11. The motor 20 for the sub-scanning drive is rotated a required number of times, the process returns to F-12, and the above process is repeated as many times as necessary.

FIG. 2 shows the range of the maximum number of pixels of the document in which the image can be read by one scan in the main scanning direction of the reader. Further, FIG. 3 shows the range of the maximum number of pixels in which an image can be printed by one scan in the main scanning direction of the printer.

FIGS. 6 and 7 show the paper feeding of the printer at the time of 50% reduction (printing in units of 50 pixels on the printer).

FIG. 9 shows a method of reducing or enlarging an image (pixel unit) read by a reader. At the time of reduction, when writing the input image to the RAM 32 as an image memory, for example, R0 of the pixel 0 is written to the 0 address of the RAM 32, G0 is the 1st address, B0 is written to the 2nd address, and the pixel 1 is not written. Write R2 to address 3, G2 to 4
Write at address, write B2 at address 5, R, etc.
Write in AM32. Then, when the output image is obtained, the image data corresponding to the reduction (50%) shown in FIG. 9 is obtained by sequentially reading from the address 0 of the RAM 32, and the process of adjusting the image data to the magnification is executed. . At the time of enlargement, the input image is sequentially written from address 0 of RAM 32. And when getting the output image,
Read R0 from address 0 of RAM32 and G0 from address 1
Lead, read B0 from address 2, then 2 from address 0
The address is read to obtain the image data of R0, G0, B0. Next, move the address of RAM32 to address 3 and
By reading 1 and repeating the same process thereafter, the image data corresponding to the enlargement (200%) shown in FIG. 9 is obtained, and the process of adjusting the image data to the magnification is performed.

The image signal subjected to the scaling processing is then supplied to the print head 12 via the shading correction circuit 52, the logarithmic converter 54, the color correction circuit 55, the binarization circuit 56 and the print head driver 57. It is printed on the print paper 23.

The image signal processed by the shading correction circuit 52 passes through the IF connector 60,
The image data is sent to the image memory 101 of the editing apparatus, and processing such as editing can be performed, and after processing, it is passed through the IF connector 60 and processed by the logarithmic converter 54. Whether to use the image signal from the image memory 101 and the clock can be selected by switching the image signal selector 53 and the image clock / image identification signal selector 59. For example, an image processing method will be described with reference to FIG. 17 when the editing apparatus is connected to the copying apparatus, the key 113 is pressed in the operation unit 108 of the editing apparatus shown in FIG. 12 as the editing mode, and R single color is selected. To do.

The processing in the shading correction circuit 52 is performed, and the input image signals (R, G, B) input to the image memory 101 are added pixel by pixel (eg, R0 + G).
0 + B0) Give the average value. The average value obtained here is replaced with the R signal, and the other G signals and B signals are set to numerical values having no signal component (0 in this embodiment) to perform editing (color conversion) into R single color, and R The image signal subjected to the monochromatic processing is passed through the IF connector 60 and the image signal selector 53, input to the logarithmic converter 54, and finally printed on the paper.

Further, when the density conversion of the editing apparatus is set, as shown in FIG. 16, the input data to the image memory 101 is set to the density (F1 to F1) set in advance.
Conversion according to the conversion table of F9) (output data)
By doing so, density conversion is performed.

15 and 20 show the CPU 24 for the copying machine.
And a procedure of communication for exchanging respective data of the editing device CPU 100.

The copying machine connect (FCNT) signal is at H level (5V) when the copying machine is powered on (5V).
The editing device connect (HCNT) signal becomes H level (5V) when the editing device power (5V) is turned on, and it is detected that the power is applied to each CPU by the FCNT and HCNT signals. Yes, CPU 24, 10
Communication is started after both 0s are powered on. Communication
The CPU 24 sets the request (REQ) signal to the H level and waits for the ACK (ACK) signal to become the H level. When the REQ signal becomes H level, the CPU 100 sets the data (corresponding to RDATA) necessary for communication in the register and the ACK signal at H level to notify the CPU 24 that the communication is ready. CP
U24 outputs a communication clock CLK when the ACK signal becomes H level, and data (data to the editing device is SDATA and data from the editing device is RDATA is synchronized between the CPU 24 and the CPU 100 in synchronization with the data clock (CLK). ) Is replaced. After exchanging necessary data,
The CPU 24 sets the REQ signal to L level and waits for the ACK signal to become L level. When the REQ signal becomes L level, the CPU 100 determines that the communication data has been exchanged, loads the data from the register storing the communication data, and sets it in the necessary area.
The ACK signal is set to the L level to notify the CPU 24 that the communication data has been received. CPU 24 is AC
Detecting that the K signal has become L level, one communication is terminated. Further, when the exchange between the CPUs 24 and 100 is required, the above process is repeated.

Next, a method of discriminating the connected device (editing device) will be described below based on the flow charts of FIGS. 15 and 21 (a) and 22.

(D22-1) In order to determine whether the editing device is connected, the copying device CPU 24 checks the level of the editing device connect signal (HCNT). When the edit device connect signal is H (5V), it is determined that the edit device is connected, and the process proceeds to D22-2. When the edit device connect signal is L (0V), it is determined that the edit device is not connected,
The processing of D22-1 is continued until the editing device is connected.

(D22-2) The request (REQ) signal of the copying device CPU 24 is turned on (H), a communication start signal is sent to the editing device CPU 100, and the process proceeds to D22-3.

(D22-3) The internal timer of the copying machine CPU 24 is started, and the process proceeds to D22-4.

(D22-4) The editing apparatus CPU 100 checks the level of the ACK signal of the copying apparatus CPU 24 in order to check whether the communication preparation is completed. When the ACK signal is H, it is judged that the data can be exchanged by the communication between the copying apparatus and the editing apparatus, and the process proceeds to D22-5. When the ACK signal is L, it is determined that the communication between the copying apparatus and the editing apparatus is still under preparation, and the process proceeds to D22-11.

(D22-5) The timer started by the processing of D22-3 has the preset time t1.
Compare within. If it is within t1, proceed to D22-10. If it is at least t1, proceed to D22-6.

(D22-6) The timer started by the processing of D22-3 has the preset time t2.
Compare within. If it is within t2, proceed to D22-9, and if it is over t2, proceed to D22-7. Regarding the processing of D22-5 and D22-6, the timing is shown in FIG.

(D22-7) When the device A is connected to the IF connector 60 as an editing device, the device A is registered in the internal storage area of the CPU 24, and thereafter, communication methods (synchronous / asynchronous, baud rate, presence / absence of parity, and even number) are registered. / Conditions necessary for communication between CPUs such as odd parity method) are set in the communication mode of the CPU 24 so as to be performed in the mode of the device A that is determined in advance, and the process proceeds to D22-8.

(D22-8) The registration of the connected device is completed,
Finish the process.

(D22-9) When the device B is connected to the IF connector 60 as the editing device, the device B is registered in the internal storage area of the CPU 24, and the communication of the CPU 24 is performed so that the communication method is performed in the mode of the device B thereafter. Set the mode,
Proceed to D22-8.

(D22-10) When the device C is connected to the IF connector 60 as the editing device, the device C is registered in the internal storage area of the CPU 24, and thereafter the communication mode of the CPU 24 is set so that the communication method is performed in the mode of the device C. Set, D
Proceed to 22-8.

(D22-11) It is checked whether the timer started by the processing of D22-3 has passed the preset timeout time, and if it is within the timeout time, the processing returns to D22-4. If the time-out period has been exceeded, proceed to D22-12.

(D22-12) An interface circuit abnormality is set in the CPU 24, and the process proceeds to D22-8.

[Other Discrimination Method 1] FIG. 19, FIG.
FIG. 23 shows the other one of the other methods of discriminating connected devices (in FIG. 19, the same reference numerals as those in FIG. 15 indicate the same configurations). When the CPU 24 checks the level of the edit device connect (HCNT) signal and the HCNT level changes from L to H, it is determined that the device is connected to the IF connector 60 or the connected device is powered on. Then
The connected device determination process is performed. CPU24 is REQ
Set the signal to H level. If the ACK signal of the CPU 24 immediately becomes the H level after setting the REQ signal to the H level, the REQ signal is then set to the L level.
After setting the REQ signal to L level, ACK of the CPU 24
If the signal becomes L level immediately, it is determined that the device D is connected. If the ACK signal of the CPU 24 remains at the H level after setting the REQ signal at the L level (the function of holding the ACK signal at the H level is omitted in FIG. 19), it is determined that the device E is connected, The device name is registered in the internal storage area of the CPU 24, and the communication method is determined.

[Other discriminating method 2] FIG. 21 (c) shows the other discriminating method 2 of the connected device. When the CPU 24 checks the level of the edit device connect (HCNT) signal and the HCNT level changes from L to H, the IF
It is determined that the device is connected to the connector 60 or the power of the connected device is turned on, and the connected device is determined. First, the CPU 24 sets the REQ signal to the H level. After setting the EQ signal to H level, C
The level of the ACK signal of PU24 is checked. REQ
The number of times the ACK signal performs L → H → L while the signal is at the H level (the H level time is determined in advance) is counted, and the connected device is determined based on the count value.

[Other Discrimination Method 3] FIG. 21D shows the other discrimination method 3 for the connected device. When the CPU 24 checks the level of the edit device connect (HCNT) signal and the HCNT level changes from L to H, the IF
It is determined that the device is connected to the connector 60 or the power of the connected device is turned on, and the connected device is determined. First, the CPU 24 sets the REQ signal to the H level. After setting the REQ signal to H level, the CPU
Check the level change of 24 ACK signals. Figure 21
As shown in (d), when the ACK changes from 0V to another voltage level, it is determined that the information from the connected device has been returned, and the ACK signal voltage at that time (not specified in the present invention). Although not present, for example, an AD converter is added to the CPU 24, and a digital value is obtained as a signal voltage of ACK), and the connected device is determined. For example, when the voltage of ACK is 1V, the device F is connected and A
When the voltage of CK is 4V, it is determined that the device G is connected, the device is registered in the internal storage area of the CPU 24, and the communication method is determined.

Although the respective discrimination methods have been described above, it is possible to determine what the connected device is by combining the respective discrimination methods. Further, although the communication means has been described in the present invention, signals (image data, image clock) in the interface connector are described.
Also, it is possible to select the optimum pattern.

Next, the load abnormality detection in the present invention will be described with reference to FIGS. 1, 27 (A to E) and FIG.

FIG. 1 shows an embodiment of the present invention. In FIG. 1, 75 is a voltage switch, 76 is a fuse, and 77 is a diode and a capacitor for converting an AC voltage into a DC voltage. The rectifying / smoothing circuit 78 is a three-terminal regulator that controls the voltage of the control output so that the voltage at the remote terminal is always a constant value.
79 is a resistor for detecting the current flowing through the load, 8
Reference numeral 0 is a voltage level converter for adjusting the voltage across the resistor 79 to the input voltage range of the input terminal of the A / D conversion of the CPU 24, and 81 is for turning on or off the current to the load 82 according to the signal of the CPU 24. Switch for 82
Is a load (solenoid,
Fan, etc.), 83 turns on / off the output of the transformer 86
A relay composed of a relay contact 83A and a solenoid 83B, and 84 is a signal from the CPU 24.
A switch for turning on and off the current to the solenoid 83B of the relay 83, 85 is a stabilizing power supply for producing a 5V voltage for the CPU 24 and the relay 83, and 87 is an AC voltage for commercial AC voltage. It is a transformer for converting into.

In the above structure, first, the person using the copying machine turns on the power switch 75. When the power switch 75 is turned on, the stabilized power supply 8 is passed through the transformer 87.
AC power is supplied to the CPU 5, and the power supply (voltage 5V) of the control system necessary for the CPU 24 and the like is created, and the voltage is applied to the CPU 24. As a result, the control procedure of the CPU 28 shown in FIG. 28 is executed.

(I-1) Data is output from the output terminals (ports) OUT0 to OUTN of the CPU 24 so that the loads are all turned off. Needless to say, during the period from when the switch 75 is turned on until the CPU 24 carries out the initializing of the load port, all the loads are turned off in terms of hardware (port pull-up, pull-down resistance, etc.). . Next, the initials of the port which is not directly related to the load are executed, the mode of A / D conversion of the input terminal and the input is set, and the process proceeds to the process (I-2). Also,
If it is necessary to use the RAM in the CPU 24 to turn off the output terminals OUT0 to OUTN of the CPU 24, at the beginning of the process I-1, the initial check process of the minimum required amount of RAM is executed in the process I-1. It

(I-2) The OUTφ terminal of the CPU 24 is set active, the switch 84 is turned on, the relay 83 is turned on, and power is supplied to the load rectifying / smoothing circuit 77. Start working,
Go to processing I-3.

(I-3) A / D conversion terminal A of CPU 24
The voltage value across the resistor 79 is measured using D1 and AD2,
It is stored in the register of the CPU 24. Next, the difference between the voltage values across the resistor 79 stored in the register of the CPU 24 is calculated to obtain the voltage applied to the resistor 79. Next, divide the voltage applied to the resistor 79 by the resistance value of the resistor 79,
The current flowing through the resistor 79 is calculated. CPU24 R
In the OM, standard current values in various states as shown in FIG. 27 (A) are determined and recorded.
The standard target current value (0.5 A) of the above is compared with the calculated value of the current flowing through the resistor 79. Then, if the difference between the standard target current value and the current flowing through the resistor 79 is within the predetermined deviation, it is determined that the load is normal. The apparatus of the present embodiment has a configuration in which a current of 0.5 A flows even when the full load is turned off (because there is a load in which current does not always turn on and off) and the current flows to the load. If the current is within the deviation of 0.5 A ± deviation, the process proceeds to process I-4. When the current flowing through the load is not within the deviation value of 0.5 A ± deviation, the process proceeds to I-18.

(I-4) Load 1 (eg solenoid 8
A signal for turning on 2) is output from the terminal of the CPU 24, and the process proceeds to process I-5.

(I-5) The current value flowing in the resistor 79 is measured and calculated, and the standard current value in the process I-5 [see FIG. 27].
(A) section A-B] 1.5A. If the current flowing through the load is within 1.5 A ± deviation value, it is determined that the load is normal, and the process proceeds to process I-6. If the current flowing through the load is other than the deviation value of 1.5 A ±, it is determined that the load is abnormal, and the process proceeds to I-18.

(I-6) Load 1 (for example, solenoid 8
A signal for turning off 2) is output from the terminal of the CPU 24, and the process proceeds to process I-7.

(I-7) The current value flowing in the resistor 79 is measured and calculated, and the standard current value in the process I-7 [Fig.
(A) Section B-C] 0.5A. If the current flowing through the load is within 0.5 A ± deviation, it is determined that the load is normal, and the process proceeds to process I-8. If the current flowing through the load is other than 0.5 A ± deviation value, it is determined that the load is abnormal and the process proceeds to I-18. In processes I-6 and I-7, the load is turned off and the load current is measured in the same state as process I-2, because the load abnormality can be detected by operating (moving) the load. Because there is.

(I-8) A signal for rotating the load 2 (for example, the stepping motor 4) is output from the terminal of the CPU 24, and the process proceeds to I-9.

(I-9) The current value flowing in the resistor 79 is measured and calculated, and the standard current value in the process I-9 [Fig.
(A) section C-D] 3.0A. If the current flowing in the load is within the deviation value of 3.0 A ±
It is determined that the load is normal, and the process proceeds to process I-10. If the current flowing through the load is other than 3.0 A ± deviation value, it is determined that the load is abnormal and the process proceeds to I-18.

(I-10) A signal for stopping the load 2 (for example, the stepping motor 4) is output from the terminal of the CPU 24, and the process proceeds to I-11.

(I-11) The current value flowing in the resistor 79 is measured and calculated and compared with the standard current value in the process I-11 [section DE in FIG. 27 (A)] 0.5A. If the current flowing through the load is within 0.5 A ± deviation, it is determined that the load is normal and the process proceeds to process I-12. If the current flowing through the load is other than 0.5 A ± deviation value, it is determined that the load is abnormal and the process proceeds to I-18.

(I-12) A signal for rotating the load 3 (for example, a fan not described in this embodiment) is sent to the CPU.
The signal is output from the terminal 24, and the process proceeds to processing I-13.

(I-13) The current value flowing in the resistor 79 is measured and calculated and compared with the standard current value in the process I-13 [section EF in FIG. 27 (A)] 2.0A. If the current flowing through the load is within 2.0 A ± deviation, it is determined that the load is normal, and the process proceeds to process I-14. If the current flowing through the load is other than 2.0 A ± deviation value, it is determined that the load is abnormal and the process proceeds to I-18.

(I-14) A signal for stopping the load 3 (for example, a fan) is output from the terminal of the CPU 24, and the process proceeds to I-15.

(I-15) The current value flowing in the resistor 79 is measured and calculated and compared with the standard current value in the process I-11 [section FI in (A) of FIG. 27] 0.5A. If the current flowing through the load is within 0.5A ± deviation, it is determined that the load is normal, and the process proceeds to step I-16. If the current flowing through the load is other than 0.5 A ± deviation value, it is determined that the load is abnormal and the process proceeds to I-18.

(I-16) RAM used by CPU 24
Performs a self-diagnosis, and if an abnormal part is found in the RAM, a process that does not use the abnormal part is executed and the process proceeds to process I-17.

(I-17) The process when the power is turned on is the CPU2.
4 and the standby state for waiting the copy start key for starting the copy start operation shown in FIG. 18 is entered. Although the load has been described as 3 in the present embodiment, it goes without saying that the load abnormality is actually checked for all loads.

(I-18) Output terminal OUT of CPU 24
From 0, a signal for turning off the relay 83 is output, and by turning off the load power source, it is prevented that the current continues to flow to the abnormal load, and the process proceeds to processing I-19.

(I-19) It is judged what kind of abnormality the load has. As an example, it is assumed that an abnormality has occurred in the load 3 (section EF in FIGS. 27B to 27E), and the determination method is shown below.

FIG. 27B shows that the load 3 has a current of 3.5 A.
(Standard value is 2.0 A), which shows that part of the load is short-circuited. In this state, when the machine is used, abnormal load develops, so a serviceman call is displayed and operation is prohibited.

In FIG. 27C, the current of the load 3 is 0
Since the value is the same as when FF, it can be seen that the load is open. In this state, only the part related to abnormal load cannot be operated.Therefore, the serviceman call is displayed and the fact that operation not related to abnormal load is possible is also displayed to the user to indicate that the machine is usable to some extent. Notify and turn on the relay 83,
Partial mode operation is possible.

FIG. 27D shows that the current of the load 3 is almost 0, the three-terminal regulator 78 detects that the output is short-circuited, and the output of the power supply is turned off. Since the machine cannot be used in this state, a serviceman call is displayed and operation is prohibited.

In FIG. 27 (E), the current of the load 3 is approximately 1.0.
It is A, which means that only part of the load is operating. In this state, when the machine is used, abnormal load develops, so a serviceman call is displayed and operation is prohibited.

In I-19, when it is judged that the load is abnormal, the process proceeds to the next process I-20.

(I-20) It is judged whether the operation is prohibited in I-19. If the operation is prohibited, I-2
Go to 1. If the operation is not prohibited, the process returns to I-14 to perform the next processing. In this embodiment, the case where the load 3 is abnormal is shown as an example.
Returned, but the load 1 was judged to be abnormal (when ON) and I-
When processed as 18, I-19, I-21, I-6
I will be back. That is, the process returns to the next step after determining the abnormality.

(I-21) Do not operate until the service engineer comes to repair it, and perform a process (end) that keeps running.

[Other Embodiment 1 of Abnormality Detection] FIG. 29 shows another embodiment 1 of abnormality detection. DC that rectifies the AC line voltage using the switching power supply 88 and stabilizes the load
It is configured so that a voltage can be supplied, and for example, as shown in the flow chart of FIG.
The current flowing through the load is converted into a voltage proportional to the current flowing through the load by the current pickup coil 89 that is connected to the DC power supply line in a non-contact manner, and the signal amplifier 9 is connected.
0 performs voltage amplification, enters the terminal AD1 of the A / D converter of the CPU 24, and is used for necessary processing in the CPU 24. When a load abnormality is detected, the relay 83 is turned off.
The input voltage of the power source 88 (AC on the primary side
Voltage) to prevent abnormal current from continuing to flow to the load.

[Second Embodiment of Abnormality Detection] FIG. 30 shows a second embodiment of abnormality detection. DC that rectifies the AC line voltage using the switching power supply 88 and stabilizes the load
It is configured so that a voltage can be supplied, and for example, as shown in the flow chart of FIG.
The current flowing through the load is converted into a voltage proportional to the current flowing through the load by the current pickup coil 89 that is coupled to the DC power supply line in a non-contact manner, and the signal amplifier 90 is connected.
Amplifies the voltage by means of the input signal, enters the terminal ADI of the A / D converter of the CPU 24, and is used for necessary processing in the CPU 24. When a load abnormality is detected, the relay 83 is turned off
By doing so, an ON-OFF control terminal of the power source 88 (also called a remote control terminal, for example, ON
When the -OFF terminal is open, no output voltage is output,
The output voltage is turned off by turning off the terminal that can control the voltage of the output terminal so that the output voltage is output when the ON-OFF terminals are short-circuited, which prevents the abnormal current from continuing to flow to the load. .

[Third Embodiment of Abnormality Detection] FIG. 31 shows a third embodiment of abnormality detection. In FIG. 31, 91 is a heater as an AC load, and 92 is an ON-OFF circuit including a relay provided between the heater 91 and the AC line. For example, as shown in the flow of FIG. 28, when the power is turned on,
Check the load for abnormalities. Turn ON-OFF circuit 92 to O
The current flowing through the AC load (for example, the heater 91, etc.) is converted into a voltage by the current pickup coil 89 which is connected to the DC power supply line in a non-contact manner, the voltage is amplified by the signal amplifier 90, and the voltage of the CPU 24 is increased. A / D converter A
It enters D1 and is used for necessary processing in the CPU 24.
The third embodiment is different from the previous embodiments in that the abnormality of the alternating current is checked, but the effective value of the alternating current is
It is necessary to check whether the AC current of the load, such as the average value or peak value, is the target value. When the abnormality of the load is detected by alternating current, the relay 83 is turned off to disconnect the power supply line and prevent the abnormal current from continuing to flow to the load 91.

In each of the first to third embodiments, the power supply line is AC
It is described as AC power line, but the power line is D
The same effect can be obtained with a C power supply, a battery, and a battery.

[0089]

As described above, according to the present invention, for example, the load short-circuits at a certain value, the current continues to flow, the temperature of the load abnormally rises, smoke is emitted from the parts,
In the worst case, the risk of fire can be prevented, and the load is opened, and the operation is performed without noticing the load abnormality (open). Since the load is open, it is impossible for other parts to operate. It is possible to prevent damage due to application of force, etc., and improve the safety of the device.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing a range in which a document can be read by one main scan of a reader.

FIG. 3 is a diagram showing a range (print range) in which an image can be formed on a sheet by one main scan of the printer.

FIG. 4 is a diagram showing a reading range of a document and a printing range on a sheet at the time of changing the magnification.

FIG. 5 is a diagram showing a main configuration of a color copying machine.

FIG. 6 is a diagram showing a sequence of forming an image on a sheet.

FIG. 7 is a diagram showing a sequence of forming an image on a sheet.

FIG. 8 is a block diagram of what is necessary for controlling each main scanning / sub scanning operation of the reader / printer.

FIG. 9 is a diagram showing a configuration necessary for enlarging / reducing an image signal read by a reader and an example of enlarging / reducing.

FIG. 10 is a diagram showing an example of connection between a copying apparatus and an editing apparatus.

FIG. 11 is a diagram showing an example of an operation unit of the copying apparatus.

FIG. 12 is a diagram showing an example of an operation unit of the editing device.

FIG. 13 is a diagram showing a relationship between main scanning / sub scanning in a reader / printer and an image identification (effective) signal.

FIG. 14 is a diagram showing a relationship between an image identification (valid) signal, image data, and an image clock.

FIG. 15 is a diagram showing a configuration of a CPU peripheral circuit block in the copying apparatus, a CPU peripheral circuit in the editing apparatus, and a communication circuit for exchanging information between the CPU in the copying apparatus and the CPU in the editing apparatus.

FIG. 16 is a diagram showing the relationship between density setting values in density conversion, data before density conversion (input data), and data after density conversion (output data).

FIG. 17 is a diagram showing a processing example of an image signal when the R monochromatic mode is selected in the editing apparatus.

FIG. 18 is a diagram showing each control flow of main scanning and sub scanning of the reader / printer.

FIG. 19 is a diagram showing a CPU peripheral circuit block in the copying apparatus and a circuit block connected to a communication line in the editing apparatus.

20 is a diagram showing an example of communication in the configuration shown in FIG.

FIG. 21 is a diagram showing a check method at the time of connection on a communication line.

FIG. 22 is a diagram showing a check flow of a connected device.

FIG. 23 is a diagram showing a flow for determining a connected device.

FIG. 24 is a diagram showing how to send a clock.

FIG. 25 is a diagram showing a method of generating an image clock in the editing apparatus.

FIG. 26 is a diagram showing the configurations of a color copying apparatus and an editing apparatus using inkjet.

FIG. 27 is a diagram showing an example of a current flowing through a load.

FIG. 28 is a diagram showing a flow of determining a load abnormality by sensing a current flowing through the load.

FIG. 29 is a diagram showing another Embodiment 1.

FIG. 30 is a diagram showing another embodiment 2.

FIG. 31 is a diagram showing another example 3;

[Explanation of symbols]

 75 power switch 76 fuse 77 rectifying / smoothing circuit 78 three-terminal regulator 79 resistance 80 voltage level converter 81 switch 82 load (solenoid, fan, etc.) 83 relay 84 switch 85 stabilizing power supply 87 transformer

Claims (14)

[Claims] 1. A current detecting means for detecting a current flowing through a load, and a value obtained by the current detecting means when the power is turned on is not within a predetermined deviation range from a target value of the current flowing through the load. A power supply device, comprising: a control means for limiting a current sometimes flowing through the load. 2. The control means, when the power is turned on, sequentially turns on and off a plurality of loads independently, and checks a current flowing through each load within an off time of each load. The power supply device according to item 1. 3. The power supply device according to claim 1, wherein the control unit has an abnormality detection unit that detects an abnormality in the load when the load is in a short circuit state or an open state. 4. The control means, when the abnormality detecting means detects that a part of the plurality of loads is an abnormality in an open state, operates the loads excluding the abnormal load. The power supply device according to claim 3. 5. The power supply device according to claim 1, wherein the current detection unit includes an element that detects a current flowing through the load in a non-contact manner with a member that supplies a current to the load. 6. The power supply device according to claim 1, wherein the control means limits a current flowing through the load by a remote on / off terminal of a power supply. 7. The power supply device according to claim 1, wherein the control unit limits the current flowing through the load by turning off the input of the power supply. 8. The power supply device according to claim 1, wherein the control unit has a non-volatile memory that stores the target value and the deviation value. 9. The power supply device according to claim 1, wherein the current detection unit detects a peak value of a current flowing through the load as a current of the load. 10. The power supply device according to claim 1, wherein the current detection unit detects an average value of currents flowing through the load as currents of the load. 11. The power supply device according to claim 1, wherein the current detection unit detects an effective value of a current flowing through the load as a current of the load. 12. The power supply device according to claim 1, wherein the control unit changes the target value and the deviation value each time a plurality of loads are turned on or off. 13. The power source according to claim 1, further comprising means for detecting an abnormality of the load, and means for notifying that the abnormality has been detected when the means detects an abnormality of the load. apparatus. 14. The current detecting means uses the voltage across the current limiting resistor in series with the element controlling the output voltage of the power supply as the current of the load. Power supply.