JPH0895431A - Copying device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a copying machine having a power supply load such as a drive motor having a standby state, wasteful power consumption in the standby state is eliminated and efficiency is improved. [Structure] Steady load 2 such as LED and CPU 3 for control
The power supply device 8 for supplying power to the power supply device 9 and the power supply device 9 such as the motor 7 having a standby state are separated,
Also, only the CPU 3 is energized by the power supply device 8, and the power supply device 9 is deactivated. Then, when the start key (copy start switch) 4 is pressed, the switch 5 is closed under the control of the CPU 3 to supply power from the power supply device 8 to the power supply device 9, and the motor 7 is operated via the motor driver 6. Move to.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine which has a reduced power consumption.

[0002]

2. Description of the Related Art In recent years, various office equipment has been used in many places. Among them, the copying apparatus uses a large number of large loads such as a DC motor that consume a large amount of electric power, and a switching method is used for the DC power supply because of its advantages of small size, light weight, and high efficiency.

By the way, the copying machine is usually operating for only a few percent of the day, and most of it is in a standby state, that is, inoperative state. The power consumption in this standby state is very wasteful, and reducing the power consumption in the standby state is considered to be a great effect for energy saving measures.

FIG. 2 is a block diagram showing the structure of the power supply circuit system of the conventional copying machine as described above.

In FIG. 2, reference numeral 1 denotes a switching type power supply device, which rectifies, smoothes, or regulates the voltage of a commercial AC power supply to form a predetermined power supply voltage. Each output voltage of the power supply device 1 is supplied to a steady load 2 such as an LED and the CPU 3 for control, and is also supplied to a motor driver 6 for driving a motor 7 as a load via a switch 5.

The CPU 3, the motor driver 6, the steady load 2 and the switch 5 are connected by control lines, and the CPU 3 controls each part.

Reference numeral 4 is a start key (start) of the copying machine.
key) and is connected to the CPU 3.

Next, the operation of the power supply circuit shown in FIG. 2 will be described.

The commercial AC power source input to the power supply unit 1 is
The power supply device 1 rectifies, smoothes, and converts the voltage into a constant voltage (here, 5V, 24V) output, and the steady load 2,
It is supplied to the CPU 3 and the motor driver 6, respectively.

The motor driver 6 is connected to the CPU 3
And drives the motor 7, which is a load.

In the copying machine, the motor 7 is not always driven as described above. In the standby state of the motor 7, the switch 6 is cut off by the control of the CPU 3 and the motor 7 is stopped. .

When the start key 4 of the copying apparatus is pressed, the CPU 3 controls the motor driver 6 by the signal from the start key 4 to rotate the motor 7.

[0013]

However, the conventional copying apparatus as described above has a problem that much power is wasted and efficiency is reduced.

That is, the relationship between the power consumption (W) and the efficiency of the circuit of FIG. 2 is as shown in FIG. 3, and if the maximum efficiency is obtained when the motor is operating, the efficiency is significantly deteriorated when the motor is not operating. Will end up.

Further, in the prior art, since the motor driver is shut off when the motor is not operating, there is power consumption even under no load, and efficiency is reduced.

The present invention has been made by paying attention to the above problems, and it is possible to eliminate wasteful power consumption.
It is an object of the present invention to provide a highly efficient copying machine in which heat generation is suppressed.

[0017]

A copying apparatus according to the present invention has a first power supply device for supplying power to a normal load such as a display section and a control section, which is in an always operating state, and a standby state such as a motor. A second power supply device for supplying power to the drive load, wherein the second power supply device is configured to be supplied with power when the copy start switch is operated to shift the drive load to an operating state. It was done.

Further, the second power supply device is configured such that power is supplied from the first power supply device when the copy start switch is operated.

Further, the control section is provided with a sleep mode which is in a non-operating state.

[0020]

In the copying apparatus of the present invention, the power supply device for the normal load such as the display section and the power supply device for the driving load such as the motor which is in the standby state, that is, the inactive state are separated from each other. The power supply unit always operates with high efficiency, and by shutting off the power supply unit in the standby state such as the motor, it is possible to prevent unnecessary power consumption of the power supply unit in the standby state such as the motor and prevent the efficiency from decreasing. it can.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

In FIG. 1, reference numeral 8 denotes a switching type first power supply device (1) for forming a predetermined power supply voltage (5 V) by rectifying, smoothing, or converting a commercial AC power supply voltage into a constant voltage. Is. The output voltage of the power supply device 8 is introduced to a normal load that is always in an operating state, that is, a steady load 2 such as a display unit having an LED and a CPU 3 that is a control unit.

In addition, a constant voltage (24V) is supplied to a motor driver 6 for driving a motor 7 which is a drive load having a standby state through a switch 5 in parallel with the rectified line of the power supply device 8. Second power supply device (2)
9 is connected. The power supply device 9 includes a power supply device 8
The rectified waveform output of is input.

The power supply device 9 is connected to the motor driver 6, and the CPU 3 and the motor driver 6 are connected.
The power supply device 9 and the steady load 2 are connected by control lines.

Reference numeral 4 denotes a start key (copy start switch) of the copying machine, which is connected to the CPU 3. Then, when the start key 4 is operated, power is supplied from the power supply device 8 to the power supply device 9 via the switch 5, and the power supply device 9 causes the motor driver 6 to shift the standby motor 7 to the operating state. It is like this.

Next, the operation will be described.

When commercial AC power is supplied to the power supply device 8, the power supply device 8 rectifies, smoothes, and makes a constant voltage, and a certain constant voltage (here, 5 V) is applied to the steady load 2 such as an LED or the CPU.
3 is supplied. At the same time, the power supply 9 is also smoothed and converted into a constant voltage, and the constant voltage (here, 2
4V) is supplied.

The motor driver 6 is controlled by the CPU 3 and drives the motor 7, which is a load.

Here, in the copying apparatus, the motor 7 is not always driven, and in this embodiment, when the motor 7 is in a standby state, a power source for supplying a constant voltage to the motor driver 6 under the control of the CPU 3. Since the switch 5 interposed between the device 9 and the power supply device 8 is cut off, the motor 7 is stopped, and the power supply device 9 is cut off, the power consumption of the power supply device 9 in the standby state is lost.

Further, the CPU 3 is provided with a sleep mode in which it is in a non-operating state to reduce the power consumption when the device is not operating.

When the start key 4 is pressed, the CPU 3 controls the motor driver 6 by the signal from the start key 4 to rotate the motor 7.

As described above, the electric circuit portion such as the motor 7 which is normally in the standby state and which shifts to the operating state when the start key 4 is pressed is disconnected from the main circuit, and normally the power supply device 8 for the normal load is used. While always operating with high efficiency,
When the motor 7 is in the standby state, the power supply device 9 that supplies power to the motor driver 6 that drives the motor 7 is shut off by the power supply device 9.

Therefore, it is possible to eliminate unnecessary power consumption in the power supply device 9 for the drive load in the motor standby state, which occupies most of the day, which contributes to energy saving measures and suppresses heat generation of the copying machine. , Can also contribute to the prevention of global warming.

[0034]

As described above, according to the present invention,
Since the power supply unit for normal load such as the display unit and the power supply unit for motors and the like that have a standby state are separated and power is supplied to the power supply unit such as a motor when the copy start switch is operated, There is an effect that wasteful power consumption can be eliminated, heat generation can be suppressed, and efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional example.

FIG. 3 is a diagram showing a relationship between power consumption and efficiency of the power supply device of FIG.

[Explanation of symbols]

 2 Steady load (display unit: normal load) 3 CPU (control unit: normal load) 4 Start key (copy start switch) 5 Switch 6 Motor driver 7 Motor (driving load) 8 First power supply device 9 Second power supply device

Claims (3)

[Claims] 1. A first power supply device that supplies power to a normal load such as a display unit and a control unit that is in an always operating state, and a second power supply that supplies power to a drive load such as a motor that has a standby state.
The second power supply device is supplied with power when the copy start switch is operated to shift the drive load to an operating state. 2. The copying apparatus according to claim 1, wherein the second power supply apparatus is supplied with power from the first power supply apparatus when the copy start switch is operated. 3. The copying apparatus according to claim 1, wherein the control unit has a sleep mode in which it is in a non-operating state.