JPS61157238A - Forming device for picture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an image forming apparatus such as a copying machine that converts AC power into DC power and uses this as a power source to drive an electrical load.

[Prior art]

An example of a conventional image forming apparatus of this type is a copying machine shown in FIG. The figure shows an outline of its electrical configuration.

In this copying machine, a commercial power source, that is, an alternating current power source, goes from a power plug 1 to a fuse 3 via a noise filter 2, and then to a main switch 6 via a door switch 4.5. ON/OFF of the copying machine is controlled by this main switch 6. Electrical loads on copying machines can be broadly classified into AC loads and DC loads. The AC loads include an induction motor 7, a fan motor 9,
There are ＼logen lamp 11, fixing heater 14, etc., and DC
Loads include drive circuits such as the relay 8.10 for controlling the AC load, semiconductor power switching elements 12 and 16, various sensors 25, solenoids 26, and high voltage unit 26a. A DC power supply for sequence control that controls the induction motor 7, fan motor 9, etc. is generated by the DC power supply device 18. That is, in the DC power supply device 18, the commercial power supply, that is, the AC power supply, has a voltage drop to the secondary side by the power transformer 19,
The signal is full-wave rectified by a diode bridge 20 and smoothed by a capacitor 22. And 3 terminal regulator 21
A stabilized DC voltage Vcc (for example, 24 V) is generated by the 3-terminal regulator 23, and the power supply Vdd for the microcomputer in the controller 24 is generated by the 3-terminal regulator 23.
is generated.

However, such conventional copying machines have a structure that requires a commercial power supply, so small desktop copying machines have recently become extremely popular, especially portable and portable copying machines such as personal copying machines.

There was a problem in that it could not be applied to a power-saving type copying machine with a small eave size. This is because if this type of copying machine is structured so that commercial power is essential, it will not be able to be used in places where that power cannot be supplied. That's because you can't.

〔the purpose〕

This invention is an attempt to solve these conventional problems, and its purpose is to be able to be used not only in places where there is a commercial power supply, but also in places where there is no power supply.
Further, it is an object of the present invention to provide an image forming apparatus whose power supply device can be replaced as necessary, and which can be easily updated.

〔Example〕

Figures 2-5 show embodiments of the invention.

As will be described later, this embodiment is a power-saving copying machine in which all electrical loads are converted to DC loads because a storage battery is used for power supply. FIG. 2 shows its electrical configuration, FIG. 3 shows the power supply device, FIG. 4 shows the power supply voltage monitoring circuit of the power supply device, and FIG. 5 shows the internal state of the power supply device. The same reference numerals as in FIG. 1 indicate the same or corresponding parts.

In Fig. 2, 27 is a transformer, 28 is a rectifier diode bridge, and 29 is a resistor, which makes the storage battery 3.
0 charger 41a is configured. Evening wave power from the power plug 1 is supplied to all DC loads through the charger 41a, overcurrent protection fuse 31, and main switch 32.

The power supply for the microcomputer in the controller 34 is generated by the three-terminal regulator 33 as in the conventional case.

The main motor 35 and the fan motor 38 are DC motors, the light source for exposing the document is a fluorescent lamp 36, and the fluorescent lamp lighting device 37 is a high frequency lighting device. As the fixing method, a light fixing method is adopted, and the fixing heater 14 used in the conventional copying machine (FIG. 1) is not required, so it is not installed. This is an important element in achieving a power-saving copying machine.

Reference numeral 41 denotes a power supply device, which is composed of a charger 41a and a storage battery 3o. 39a is a connector provided on the controller 34 side of this power supply device 41, and 39b and 39c are commercial power input terminals.

Because of this configuration, if you are in a place where there is a commercial power source, you can plug the power plug 1 into the outlet.
The power is supplied to all DC loads as DC power through the charger 41a, fuse 31, and main switch 32. When power is not supplied to all DC loads, the storage battery 3o is charged. On the other hand, in places where there is no commercial power source, all DC loads are similarly supplied from the storage battery 30 charged in advance.

Therefore, this copying machine can normally be used in the same way as before by plugging the power plug 1 into an outlet, and in places where commercial power cannot be supplied, it can be used by discharging the storage battery that is normally charged during use. .

FIG. 3 shows an example of the mechanical configuration of the power supply device 41. As shown in FIG.

This device 41 has 20 storage batteries 30 and a charger 41a connected in series, which are housed together in a pack shape in a case C1 with the circuit configuration shown in FIG. 2. The commercial power input terminal 39b is an inlet type provided in the exterior case C2 of the copying machine. The lead wire of the terminal 39b is connected to a terminal 39c which projects the terminal 39b into the interior of the copying machine via a connector 42a. This connector 42a can be attached to and detached from the terminal 39c. The commercial power source has a connector 43 connected to the power plug 1 inserted into the outlet.
is supplied by connecting it to terminal 39b. 42
b is a DC power input terminal, and when the connector 39a is connected to this, DC power is supplied from this to the controller 34 side.

Therefore, this power supply device 41 can be removed from the copying machine by removing the connector 42a from the commercial power input terminal 39b and the connector 39a from the DC power input terminal 42b. Therefore, if necessary, the update can be easily performed at any time.

FIG. 4 shows a power supply voltage monitoring circuit provided within the controller 34.

In the figure, 44 is a Zener diode that serves as a reference voltage for determining the level of the divided power supply voltage VCC (described later), 47 is a comparator, and resistor 4
The power supply voltage Vcc divided by 5.46 and the Zener voltage Vz (reference voltage) are compared. 48 is a transistor, which receives the power supply voltage Vc divided from the Zener voltage Vz.
When c becomes low, ONI turns on the LED 49 and at the same time instructs the microcomputer 50 to prohibit the copying operation. That is, when the voltage of the storage battery 30 drops to a predetermined value or lower due to excessive discharge, the divided power supply voltage becomes lower than the reference voltage. Then, the transistor 48 turns on and the LED 49 lights up to notify that the storage battery 30 needs to be charged. At the same time, the information is input to the microcomputer 50, and the microcomputer 50 executes a program for prohibiting the copying operation.

In this way, if the storage battery 30 is insufficiently charged, you will receive a warning by turning on the LED 49 and stopping the copying operation, so check this in advance and charge the storage battery 3°. The condition can be maintained and managed appropriately.

FIG. 5 shows an example of a copying machine incorporating a power supply device 41. As shown in FIG. The same parts as in FIGS. 2 and 3 are given the same reference numerals.

This copying machine is shown with a power supply device 41 built into its main body, and when used indoors with commercial power, connect the power plug l to the outlet as before.
When using in a place where commercial power is not available, turn main switch 32 ON. ! 30
'lr-'t m & t 6: k 4: J:
-'if y<-'/j It can be used as a null copying machine. Therefore, according to this copying machine, there is no need to carry a commercially available battery pack or the like in addition to the copying machine, and the characteristic of this type of copying machine that can be used anywhere can be fully utilized.

〔effect〕

As explained above, according to the present invention, one of the commercial power sources is
First, we installed a storage battery that can be charged from an AC power source using a charger, and configured this storage battery together with the charger as a power supply device, which can be replaced as necessary. Of course, it is possible to obtain an image forming apparatus that can be used even in places where there is no supply, and whose power supply device can be easily updated.

[Brief explanation of drawings]

FIG. 1 is an electrical configuration diagram of a conventional copying machine, FIG. 2 is a main configuration diagram of an embodiment of the present invention, FIG. 3 is a plan view of the power supply device in FIG. 2, and FIG. 4 is a power supply device. FIG. 5 is a perspective view of a copying machine incorporating the power supply device. In the figure, l is a power plug, 27 is a transformer, 28 is a rectifier diode bridge, 3o is a storage battery, 41a is a charger, 39a, 42a, 43 are connectors, 39b is a commercial power input terminal, 42b is a DC power input terminal, 44 is a Zener diode, 47 is a comparator, and 49 is an LED.

Claims (1)

[Claims] An image forming apparatus characterized in that one of the DC power supplies is a storage battery that can be charged from an AC power supply with a charger, and the storage battery and the charger are built in as a replaceable power supply device.