JPH06100993B2 - Machinery controller - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a mechanical device, and more particularly to a control device for a mechanical device that has a nonvolatile memory and retains stored contents even when the power is unexpectedly cut off. .

2. Description of the Related Art For example, in a copying machine, a user inputs settings such as the number of copies, copy magnification, image density, and copy paper size.
The copying operation is executed based on this setting data. Also,
In the case of a reader printer, the setting input must be positive.
Selection of positive / negative-positive and switching of auto / manual are also included.

Conventionally, when no operation is performed on the copying machine after the end of the copying operation or after the setting input operation, it is considered that the user does not continue to use the setting data, and it is determined by a timer or the like. When the time elapses, a so-called auto clear process is performed in which the setting data is automatically returned to predetermined standard data, for example, the number of copies is 1, the copy magnification is × 1, and the image density is returned to an intermediate level.

On the other hand, as a measure against unexpected power failure such as power failure or unplugged power, in order to protect the above setting data, the setting data is stored in the battery backed up RAM or EPROM and the power is turned on again. There is provided an apparatus which displays setting data stored when a copying machine or the like becomes reusable and operates based on the setting data.

However, in this device, the stored setting data is valid when the power is immediately restored in the event of a simple unplugging, but when the power is restored after a long time has passed, Almost no operation is performed based on the previous setting data, and the stored setting data becomes useless and meaningless, and the next user operates the device without noticing this setting data. Therefore, there is a risk that the operation may be unsuccessful.

It is an object of the present invention to provide a control device which solves the above-mentioned inconvenience by paying attention to the above points and invalidating the operation based on the stored data of the nonvolatile memory when the power supply interruption time is long.

The control device for a mechanical device according to the present invention controls the mechanical device to operate based on the operating condition set by the user, stores the operating condition in a nonvolatile memory, and stores the operating condition in the nonvolatile memory. A control device for a mechanical device in which the operating condition is kept stored in the non-volatile memory even after the power supply is cut off, and a timekeeping means for starting a timing operation when the power supply to the mechanical device is cut off. When, the time measured by the time measuring means while the energization is cut off is shorter than a predetermined time preset regardless of the storage state of the nonvolatile memory,
After the energization is restarted, the mechanical device is set to a state in which the operation based on the operating condition stored in the non-volatile memory is performed, and when the timed time exceeds the predetermined time, the preset time is set. It is characterized in that the mechanical device is set to operate based on the standard data thus obtained.

Example One example of the present invention will be described below.

FIG. 1 shows the configuration of the control device of the copying machine. The CPU ₁ controls the copying operation and performs arithmetic processing. CPU _{1 for} ROM ₂
The processing program of is stored. 3, for example a battery Batsukuatsupu non-volatile RAM, non-volatile RAM ₃
Are provided with storage areas 3a, 3b ... Which store setting data such as the number of copies, copy magnification, and image density set by the user. CPU ₁ depending on the data from this non-volatile RAM ₃
Then, the information for controlling the copying operation is output. Information from the CPU ₁ is output via the I / O device 4 to the display unit 5, the transfer relay 6 and the charging relay 6 of the separation charger.

7 is a power-off time timer. This power-off time timer 7
Starts timing operation when the power of the copying machine is turned off, and outputs a signal when a preset time has elapsed. The signal from the power off time timer 7 is sent to the CPU via the I / O device 4.
Input to ₁ .

Setting data such as the number of copies, copying magnification, and image density set by the user is stored in the nonvolatile RAM ₃ , and these data are displayed on the display unit 5. If the copying machine is powered off for some reason while the copying operation is being performed based on the setting data, the power-off time timer 7 starts the time counting operation. When the power is restored before the set time of the power-off time timer 7 elapses for a short time in the power-off state, the setting data stored in the nonvolatile RAM ₃ is displayed again on the display unit 5. At the same time, the copying operation can be performed again based on the setting data.

On the other hand, the power is off for a long time, and even when the set time of the power off time timer 7 has passed, the power is still off,
When the power is restored after this, the power off time timer 7
Signal is output from the CPU, and this signal is sent to the CPU via the I / O device 4.
Input to ₁ . Then, the setting data stored in the non-volatile RAM ₃ is cleared by the signal output from the CPU ₁ , and the copying machine sets predetermined standard data, for example, the number of copies is 1 and the copying magnification is × 1 as described above. , An automatic clear process for returning the image density to an intermediate level or the like is performed, and a copying operation is performed based on the standard data, and the standard data is displayed on the display unit 5.

Further, even if the power supply to the mechanical system of the copying machine is cut off, power may be supplied to the control device. In this case, when the mechanical system is in a power-off state for a long time, and the power-off time continues even after the set time of the power-off time timer 7 has elapsed, when the set time of the power-off time timer 7 has elapsed,
The signal output from the power-off time timer 7 is input to the CPU _1, the signal outputted from the CPU _1, a nonvolatile RA
The setting data stored in M ₃ is cleared, and when the power is restored, the copying machine is ready for copying based on the standard data.

FIG. 2 shows an embodiment of the configuration of the power-off time timer 7 described above, and a power supply terminal 11 to which a power supply (not shown) is connected.
A relay contact 13, a diode 14, a current limiting resistor 15 and a capacitor 16 are connected in series with the ground point 12 and a resistor 17 is connected in parallel with the capacitor 16. Further, a variable resistor 18 and a resistor 19 are connected in series between the power supply terminal 11 and the ground point 12, and a point A, which is a connection point between the resistor 15 and the capacitor 16, is connected to the negative input terminal 20a of the comparator 20. The point B, which is the connection point between the variable resistor 18 and the resistor 19, is the comparator.
It is connected to the + input terminal 20b of 20. This comparator 20
The output terminal 20c of is connected to the above-mentioned I / O device 4.

When power is supplied to the copying machine, relay contact 13
Is closed and the capacitor 16 is charged through the diode 14 and the resistor 15. The voltage V _{t at the} point A due to the charging of the capacitor 16 is higher than the voltage V _{s at the} point B determined by the variable resistors 18 and 19, the signal at the output terminal 20c of the comparator 20 is at the “Low” level, and the CPU ₁ The copying operation is controlled based on the setting data stored in the nonvolatile RAM ₃ .

Now, if the power is cut off for some reason, the relay contact 13 opens, the capacitor 16 discharges through the resistor 17, and A
The voltage V _{t at the} point decreases over time. After that, when the power is restored, the relay contact 13 is still open at this time, and the charging pressure of the capacitor 16 during discharging is A
The voltage V _t at the point and the reference voltage V _{s at the} point B are input to the comparator 20. If the time during which the power is off is short, and therefore the voltage V _t at point A does not drop so much and V _t <V _s , the output terminal 20c of the comparator 20 is at the “Low” level and the CPU ₁
Reads this signal via the I / O device 4. Then, as described above, the copying machine returns to the state where the copying operation is performed based on the setting data stored in the nonvolatile RAM ₃ .
After this, the relay contact 13 is closed and the capacitor 16 is charged again.

On the other hand, the power-off state is long, and therefore the voltage V _{t at} point A
If V _t <V _s when the power supply is restored, the output terminal 20c of the comparator 20 is inverted to the “High” level,
The CPU ₁ reads this signal via the I / O device 4. Then, as described above, the stored contents of the non-volatile RAM ₃ are cleared, and the copying operation based on the standard data is performed. Then, after this, the relay contact 13 is closed and the capacitor 16 is charged.

Further, even if the power supply to the mechanical system of the copying machine is cut off, the reference voltage V _S is continuously applied to the terminal 20b of the comparator 20 when the power supply to the control device is continued. Then, the power supply to the mechanical system is cut off, the relay contact 13 opens, and the capacitor
16 is discharged and the voltage V _t at the point A at this time and the reference voltage V _s are compared by the comparator 20. Power off time is short and V _t
When power is restored with <V _s , relay contact 13 closes and capacitor 16 recharges, so the comparator
The output terminal 20c of 20 remains at the "Low" level, the CPU ₁ reads this signal, and the copying machine returns to the state in which the copying operation is performed based on the setting data stored in the nonvolatile RAM ₃ . Also, the time during which the mechanical system is powered off is long.
When V _t <V _s , the output terminal 20c of the comparator 20 becomes “Hig
The signal is inverted to the h "level, the CPU ₁ reads this signal, and the setting data stored in the non-volatile RAM ₃ is cleared. Then, when the machine power is restored, the copying machine copies based on the standard data. The operation is ready to be performed.

In the above circuit, the diode 14 is provided in order to prevent the reverse flow of the current due to the charging voltage of the capacitor 16 when the relay contact 13 is not opened due to the operating voltage of the relay when the power is cut off. There is. The current limiting resistor 15 is provided to protect the relay contact 13. Here, the resistance value R ₁ of the resistor 15 and the resistance value R ₂ of the resistor 17 are
Due to the relationship of R ₁ << R ₂ , the charging time constant of the capacitor 16 is small. Further, the power source voltage is divided by the variable resistors 18 and 19 to obtain the reference voltage V _s. By changing the resistance value of the variable resistor 18, the operation time of the auto clear can be arbitrarily adjusted.

In the above power off time timer, the relay contact
A switch may be configured by using a semiconductor element instead of 13, and a resistor that does not significantly affect the comparison between the voltage V _s and the voltage V _t may be used instead. In addition, the battery back-up or the like may be used to constantly count the time, and it is easy to know the elapsed time after the power is turned off.
Also, the power-off time timer was set to battery backup.
It can also be configured by software using a CPU and RAM. Further, the power-off time timer may have the same time setting as the conventional auto clear timer, or may have a long time. Further, the memory control device of the present invention is applicable not only to a copying machine but also to various mechanical devices.

Effect As described above, in the present invention, the power supply to the mechanical device having the non-volatile memory that stores the data indicating the preset operating condition is cut off, and the state where the power supply is cut off is set for a preset time. If shorter,
After resuming the energization, the mechanical device is set to a state in which the operation based on the operating condition stored in the non-volatile memory is performed, and when the state in which the energization is cut off is longer than the above time, Since the mechanical device is set to operate under an operating condition different from the operating condition, it is possible to eliminate the inconvenience that the operation is performed under the incorrect operating condition when the power supply is restored.

[Brief description of drawings]

FIG. 1 is a block diagram showing the construction of a control device for a copying machine to which the present invention is applied, and FIG. 2 is a circuit diagram showing an embodiment of the construction of a power-off time timer. 1 ... CPU, 3 ... nonvolatile RAM, 4 ... I / O device, 7 ...
… Power off time timer.

Claims (1)

[Claims] 1. A mechanical device is controlled to operate based on an operating condition set by a user, and the operating condition is stored in a non-volatile memory, even after the power supply to the mechanical device is cut off. A control device for a mechanical device, wherein the operating conditions are continuously stored in the non-volatile memory, having a clocking means for starting a clocking operation when the electrical power to the mechanical device is cut off. When the time measured by the time measuring means during the interruption is shorter than a predetermined time set in advance regardless of the storage state of the nonvolatile memory, the nonvolatile state is resumed after the energization is restarted. The machine device is set in a state in which the operation based on the operation condition stored in the performance memory is performed, and when the timed time exceeds the predetermined time, a preset value is set. Control apparatus for mechanical devices and sets the machine to operate based on quasi-data.