JP3224456B2 - Power supply for image forming apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power input device for an image forming apparatus.

[0002]

2. Description of the Related Art In an environment where an image forming apparatus such as a copying machine is used, for example, a single-phase two-wire system, a single-phase three-wire system, a three-phase three-wire system, and a three-phase There is one of four-wire type. Usually, a dedicated image forming apparatus suitable for the power supply is used depending on the type of the available power supply.

Therefore, the image forming apparatus is a single-phase two-wire system or a three-phase system.
It is necessary to have a structure that can use a phase 4-wire power supply. For example, since a general image forming apparatus is compatible with a single-phase two-wire power supply, in order to connect it to a three-phase power supply, for example, a three-phase to single-phase conversion transformer is used to connect a three-phase power supply. It must be converted to a single phase or a dedicated connection circuit component must be prepared. However, transformers are large, heavy and expensive. In addition, in order to cope with a plurality of types of commercial power sources, the types of parts increase and the number of parts used increases, and further, it is necessary to change parts and select a product type according to the use environment of the apparatus. Therefore, manufacturing and management costs are increased.

[0004]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an image forming apparatus which can cope with a plurality of types of power supplies and to avoid the above disadvantages.

[0005]

Means for Solving the Problems To solve the above problems,
Therefore, the power input device of the image forming apparatus according to the first invention has three
Phase 4-wire AC power supply and single-phase 2-wire AC power supply can be connected freely
Four power input terminals (L1, L2, L3, N); image forming apparatusCon
A first DC power supply (105) for supplying power to the
Main switch (10) that opens and closes the power supply path to the DC power supply (105)
3); Electric coil supplied from the first DC power supply (105)
A relay (104) including a number of contacts and switching contacts; The contact
Of the image forming apparatus, which is supplied with power through one of the
For powering electric motors and imaging process equipment
A second DC power supply (108);The other one of the contacts and the opening / closing contact
Powered through the image forming apparatusEnergizes the third load means
Domeans(112);as well asThe main switch (103) and the
(104) and three of the four power input terminals
Each terminal for phaseBetween them, and their connection status,
The contacts of the main switch (103) and the relay (104) areExchange
Connected to only one phase of the power supplySingle-phase two-wire connection
When,Contact of the main switch (103) and the relay (104)
ButThree-phase AC power supplyThree-phase four-wire connection connected to each
ContinuedCan be switched to andWherein the main switch is a single-phase
Connect to the terminal to which the two-wire feeder is connected,Switching switch
Switch means (102);

A power input device of an image forming apparatus according to a second aspect of the present invention has four power input terminals (L1, L2, L3, and L3) to which a three-phase four-wire AC power source and a single-phase two-wire AC power source can be connected. N); a first DC power supply (10) for supplying power to the controller (106) of the image forming apparatus.
5) and a main for opening and closing the power supply path to the first DC power supply (105)
Switch (103); power supplied from the first DC power supply (105)
Relays including air coils, multiple contacts and switching contacts (10
4); an image which is supplied with power through one of the contacts and an opening / closing contact ;
Supply the electric motor of the image forming apparatus and the image forming process equipment
Second DC power source (108) for electrostatic; is fed via the other one closing contact piece of the contact, the third negative image forming apparatus
Means (112) for energizing the loading means, which is connected to a part of the four power input terminals and detects which of a three-phase four-wire AC power source and a single-phase two-wire AC power source is connected to the power input terminals Detecting means (114) to perform the operation and the main switch (103)
And contacts of the relay (104) and the four power input terminals.
Disposed between each terminal for 3 phase in, their connection status, in accordance with the detection state of the detection means, said Meinsu
Switch (103) and a single-phase two-wire connection contacts are connected in common to only one phase of the AC power supply relay (104), the main
The switch (103) and relay (104) contacts are 3
Automatically switch to any of the three-phase four-wire connections connected to each of the phases, and the main switch is a single-phase two-wire supply.
Electromagnetic changeover switch means (102) connected to a terminal to which the electric wire is connected .

The symbols shown in the parentheses indicate the reference numerals of the corresponding elements in the embodiments described later for reference, but each component of the present invention is a specific element in the embodiments. It is not limited to only.

[0008]

In an image forming apparatus such as a copying machine, for example, various loads such as a DC power supply, an exposure lamp, and a fixing heater are provided, each of which consumes considerably large power. The state of these loads is independent of the phase of the power supplied to them, and power can be supplied to each load independently. However, when using a three-phase AC power supply, connecting all loads to only one of them causes various problems.

According to the present invention, since the changeover switch means is provided, the main switch (103) and the relay are provided.
-(104) contacts and three phases of the four power input terminals
It is installed between the respective terminals of use, their connection status, before
A single-phase two-wire connection in which the contacts of the main switch (103) and the relay (104) are commonly connected to only one phase of the AC power supply;
Since the contacts of the main switch (103) and the relay (104) can be freely switched to a three-phase four-wire connection connected to each of the three phases of the AC power supply, a single-phase two-wire AC When the power supply is connected to the power input terminal, the former state is set, and when the three-phase four-wire AC power supply is connected to the power input terminal, the state is switched to the latter state. For all three-phase four-wire AC power supplies, all negative
A predetermined power can be supplied to the load, and no problem occurs.

According to the second aspect of the present invention, the single-phase two-wire AC power supply and the three-phase four-wire AC power supply are connected to the power input terminal in accordance with the detection state of the detection means. Since the state of the electromagnetic changeover switch means is automatically switched according to either of them, even when the type of the power supply to be connected changes, the operation of changing the connection state is unnecessary, and the connection error can be prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 shows the construction of a mechanism of a type of copying machine embodying the present invention. This will be described with reference to FIG. An automatic document feeder 3 or a semi-automatic document feeder 3A places a document 4 on a contact glass 2 provided above the apparatus main body 1.
Are sequentially sent one by one. The image of the document 4 conveyed onto the contact glass 2 is formed on a belt-shaped photoconductor 7 via an optical system such as an illumination lamp 5 and an image forming lens. An image is formed. The latent image is visualized by a toner in the developing unit 8 to become a toner image. This toner image is transferred to paper feed trays 10A and 10A by a transfer / separation unit 9.
The toner image is transferred onto transfer paper 11 fed from B, 10C or large capacity paper feed tray 10D, and the toner image is fixed when the transfer paper passes through fixing unit 12. Transfer paper 11 after fixing is completed
Is discharged onto the paper discharge tray 13. When the sorter 16 is connected, the discharged transfer paper 11 passes through the paper path 14 and the reversing section 15 and is discharged to each bin 17 provided in the sorter 16 and is transferred to the paper 17. Are arranged in the same order.

FIGS. 1 and 2 show the configuration of the power supply system of the copying machine shown in FIG. FIG. 1 shows a case where a three-phase four-wire commercial AC power supply 100a is connected to the power input of the copying machine, and FIG. 2 shows a case where a single-phase two-wire commercial AC power supply 100b is connected. In this example, four terminals L are connected to the power input of the copying machine.
1, L2, L3, and N are provided. As shown in FIG. 1, when a three-phase four-wire commercial AC power supply (Y connection) 100a is connected, three terminals L1, L2, and L3 are provided. A hot line (hot wire) is connected, and a neutral line (neutral wire) is connected to the terminal N. As shown in FIG. 2, when connecting a single-phase two-wire commercial AC power supply 100b, the power supply 100b is connected to the terminals L1 and N.

As a main load, a controller 10 for executing predetermined image forming control is provided in a power supply system of the copying machine.
6, exposure lamp (flash) 109, main motor 1
11, a fixing heater 113 and the like are connected. The controller 106 is supplied with DC power from a DC power supply unit (PSU) 105, the exposure lamp 109 and the main motor 111 are supplied with DC power from a DC power supply unit (PSU) 108, and a fixing heater. AC power is supplied to 113 via a solid state tray (SSR) 112.

The four power input terminals L1, L2, L3 and N are connected to a circuit breaker 101 for protection.
The changeover switch 102, the main switch 103, and the electromagnetic relay 104 are connected. The AC input terminal of the DC power supply unit 105 is connected to the output of the main switch 103. When the main switch 103 is closed (turned on), the terminals LA and NA are connected to the AC input terminal of the DC power supply unit 105. An electromagnetic relay 10 is connected to a DC output terminal of the DC power supply unit 105 via a driver 107.
4 drive coils are connected, and the main switch 10
When the switch 3 is turned on, the drive coil of the electromagnetic relay 104 is energized. The electromagnetic relay 104 is provided with four interlocked contacts. When the drive coil is energized, the four contacts are closed, and the DC power supply unit 10 is connected to the terminals LB and NB.
8 is connected, and the SSR 112 and the fixing heater 113 are connected to the terminals LC and NC.

A changeover switch 102 provided between the circuit breaker 101 and the main switch 103 and the electromagnetic relay 104 is a toggle switch linked with two circuits, and is switched by a human operation. When a three-phase four-wire commercial AC power supply is used as the power supply for the copying machine, the state of the changeover switch 102 is set as shown in FIG.
When a single-phase two-wire commercial AC power supply is used, the state of the changeover switch 102 is set as shown in FIG.

First, a case where a three-phase four-wire commercial AC power supply is used will be described with reference to FIG. Changeover switch 1
In 02, the contact 102a2 is connected to the contact 102a3 and the contact 102b2 is connected to the contact 102b3, so that the first-phase power between the power input terminals L1-N is transmitted via the circuit breaker 101 and the changeover switch 102. Is applied to the terminal CA-NA of the main switch 103, and the second phase power between the power input terminals L2 and N is supplied to the electromagnetic relay 10 via the circuit breaker 101 and the changeover switch 102.
4 terminal LB-NB and the power supply input terminal L3-N
The third phase power is supplied to a terminal LC- of an electromagnetic relay 104 via a circuit breaker 101 and a changeover switch 102.
Applied to NC. Therefore, when the main switch 103 is turned on, the first phase power is applied to the AC input terminal of the DC power supply unit 105, and the DC power supply unit 105 outputs a predetermined DC power, so that power is supplied to the controller 106. . Further, since the drive coil of the electromagnetic relay 104 is energized by the DC power output from the DC power supply unit 105, the electromagnetic relay 104 is turned on and the terminal LB-N
B applies the second phase power to the AC input terminal of the DC power supply unit 108, and the DC power supply unit 108 outputs a predetermined DC power.
Power can be supplied to the terminal
Can supply the third phase power to the fixing heater 113.

Next, a case where a single-phase two-wire commercial AC power supply is used will be described with reference to FIG. Changeover switch 1
In No. 02, the contact 102a2 is connected to the contact 102a1, and the contact 102b2 is connected to the contact 102b1, so that the contacts 102a1, 102a2, 102b1, and 102
b2 is commonly connected to the terminal L1, and the single-phase AC power between the power input terminals L1 and N is equal to the circuit breaker.
The voltage is applied to the terminal CA-NA of the main switch 103, the terminal LB-NB of the electromagnetic relay 104, and the LC-NC via the power switch 101 and the changeover switch 102, respectively. Therefore, when the main switch 103 is turned on, single-phase power is applied to the AC input terminal of the DC power supply unit 105, and the DC power supply unit 105 outputs a predetermined DC power, so that power is supplied to the controller 106. Further, since the drive coil of the electromagnetic relay 104 is energized by the DC power output from the DC power supply unit 105, the electromagnetic relay 104 is turned on, and the single-phase power is supplied from the terminal LB-NB to the AC input terminal of the DC power supply unit 108. And the DC power supply unit 108 outputs a predetermined DC power, so that power can be supplied to the exposure lamp 109 and the main motor 111, and the single-phase power is fixed from the terminal LC-NC.
Data can be supplied to the data 113.

In this example, a single-phase AC power supply is connected between the power supply input terminals L1-N. However, if the connection state of the changeover switch 102 is changed, the power supply input terminals L2-N
A single-phase AC power supply may be connected between the terminals or between L3 and N.

FIG. 4 shows the configuration of a power supply system in another embodiment. Referring to FIG. 4, also in this embodiment, four power input terminals L1, L2, L3 and N are provided, and these power input terminals are connected to a three-phase four-wire commercial An AC power supply 100a or a single-phase two-wire commercial AC power supply 100b is connected.

The four power input terminals L1, L2, L3 and N are connected via a circuit breaker 101 for protection.
The electromagnetic relay 115, the main switch 103, and the electromagnetic relay 104 are connected. The AC input terminal of the DC power supply unit 105 is connected to the output of the main switch 103, and when the main switch 103 is closed (on),
Terminals LA and NA are connected to an AC input terminal of DC power supply unit 105. The drive coil of the electromagnetic relay 104 is connected to the DC output terminal of the DC power supply unit 105 via the driver 107. When the main switch 103 is turned on, the drive coil of the electromagnetic relay 104 is energized. The electromagnetic relay 104 is provided with four interlocking contacts. When the drive coil is energized, these four contacts are closed, the DC power supply unit 108 is connected to the terminals LB and NB, and the terminals LC and NC are connected to the terminals LC and NC. The SSR 112 and the fixing heater 113 are connected.

An electromagnetic relay 115 provided between the circuit breaker 101, the main switch 103 and the electromagnetic relay 104 has four sets of contacts 115a, 115b, 1
15c and 115d and a drive coil are provided, and when the drive coil is not energized, the contacts 115a and 115d
When the drive coil is energized, the contacts 115a and 115c are opened and the contacts 115b and 115d are closed.

The energization of the drive coil of the electromagnetic relay-115 is as follows.
It is controlled by the voltage detection unit 114. The voltage detecting unit 114 is a step-down transformer 114 connected to the power input terminal L2-N via the circuit breaker 101.
a, a diode bridge 114b connected to the secondary side of the transformer, a capacitor 114c connected to the full-wave rectified output of the diode bridge, a resistor 114d, and a Zener diode 114e. A wave rectifier circuit is formed. That is, when a predetermined AC voltage appears at the input terminal L2-N, a predetermined DC voltage appears at the output terminal of the voltage detection unit 114, and by this DC voltage,
When the drive coil of the electromagnetic relay-115 is energized, the electromagnetic relay
115 turns on.

Power input terminals L1, L2, L3 and N
When a four-phase commercial AC power supply is connected, a predetermined AC voltage is applied to the input of the voltage detection unit 114, so that the electromagnetic relay-115 is turned on.
When a single-phase two-wire commercial AC power supply is connected to the power supply, no AC voltage is applied to the input of the voltage detection unit 114, and the electromagnetic relay-115 is turned off.

Therefore, when a three-phase four-wire commercial AC power supply is used, the contact point 115b
And 115d are closed and the contacts 115a and 115c are open, so that the first phase power between the power input terminals L1-N is
The second phase power between the power input terminals L2 and N is applied to the terminal CA-NA of the main switch 103 via the kit breaker 101 and the electromagnetic relay 115, and the circuit breaker
Electromagnetic relay 10 via power 101 and electromagnetic relay 115
4 terminal LB-NB and the power supply input terminal L3-N
The third phase power is supplied to the terminal LC-N of the electromagnetic relay 104 via the circuit breaker 101 and the electromagnetic relay 115.
C is applied. Therefore, when the main switch 103 is turned on, the first phase power is applied to the AC input terminal of the DC power supply unit 105, and the DC power supply unit 105 outputs a predetermined DC power, so that power is supplied to the controller 106. . Also, since the drive coil of the electromagnetic relay 104 is energized by the DC power output from the DC power supply unit 105, the electromagnetic relay 104 is turned on and the terminal LB-NB is turned on.
Is applied to the AC input terminal of the DC power supply unit 108, and the DC power supply unit 108 outputs a predetermined DC power, so that power can be supplied to the exposure lamp 109 and the main motor 111. The third phase power can be supplied to the fixing heater 113 from the LC-NC.

On the other hand, when a single-phase two-wire commercial AC power supply is used, the contact
Since b and 115d are open and the contacts 115a and 115c are closed, the single-phase AC power between the power input terminals L1-N is:
The signals are applied to the terminal CA-NA of the main switch 103, the terminals LB-NB and LC-NC of the electromagnetic relay 104 via the circuit breaker 101 and the electromagnetic relay-115, respectively. Therefore, when the main switch 103 is turned on, single-phase power is applied to the AC input terminal of the DC power supply unit 105, and the DC power supply unit 105 outputs a predetermined DC power, so that power is supplied to the controller 106. Further, since the drive coil of the electromagnetic relay 104 is energized by the DC power output from the DC power supply unit 105, the electromagnetic relay 104 is turned on, and the single-phase power is supplied from the terminal LB-NB to the AC input terminal of the DC power supply unit 108. And the DC power supply unit 108 outputs a predetermined DC power, so that power can be supplied to the exposure lamp 109 and the main motor 111, and single-phase power is supplied from the terminal LC-NC to the fixing heater 113. Can be supplied.

That is, the state of the electromagnetic relay 115 is automatically switched according to the type of power supply connected to the power supply input terminals L1, L2, L3, and N, and all loads are connected to the power supply in an appropriate connection state. Is done.

In the embodiment shown in FIG. 4, the power input terminal L1
-N, a single-phase AC power supply is connected. However, if the connection state of the electromagnetic relay-115 is changed, the power supply input terminal L2
A single-phase AC power supply may be connected between -N or L3-N.

[0028]

As described above, according to the present invention, one type of image forming apparatus can be connected to either a single-phase AC power supply or a three-phase AC power supply simply by switching the state of the changeover switch means. It is. Therefore, there is no need to prepare a plurality of types of devices according to the type of power supply, and it is not necessary to provide special parts such as a three-phase to single-phase conversion transformer or to replace parts. The above cost reduction effect can be expected.

According to the second aspect of the present invention, the state of the electromagnetic switch is automatically switched according to the type of the power supply actually connected, and the connection state is adapted to the type of the power supply. There is no need for troublesome switching, and it is possible to avoid a connection error.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a power supply system according to an embodiment.

FIG. 2 is a block diagram showing different connection states of the power supply system of FIG.

FIG. 3 is a front view illustrating a configuration of a mechanical unit of the copying machine according to the embodiment.

FIG. 4 is a block diagram illustrating a configuration of a power supply system according to a modified example.

[Explanation of symbols]

1: Device body 2: Contact glass 3: Automatic document feeder 3A: Semi-automatic document feeder 4: Document 5: Illumination lamp 7: Belt photoconductor 8: Developing unit 9: Transfer / separation unit 10A, 10B, 10C: Supply Paper tray 10D: Large-capacity paper feed tray 11: Transfer paper 12: Fixing unit 13: Discharge tray 14: Paper pass 15: Reversing unit 16: Sorter 100a: Three-phase four-wire commercial AC power supply 100b: Single Phase two-wire commercial AC power supply 101: Circuit breaker 102: Changeover switch 103: Main switch 104: Electromagnetic relay 105: DC power supply unit 106: Controller 108: DC power supply unit 109: Exposure lamp 111: Main module -Ta 112: Solid stay
Triller 113: Fixing heater 114: Voltage detection unit 115: Electromagnetic relay L1, L2, L3, N: Power input terminal LA, NA, LB, NB, LC, NC: Terminal

Claims (2)

(57) [Claims] 1. A power supply input terminal to which a three-phase four-wire AC power supply and a single-phase two-wire AC power supply can be connected; a first DC power supply for supplying power to a controller of an image forming apparatus;
And a main switch for opening and closing the power supply path to the first DC power supply
H: an electric coil supplied from the first DC power supply, a plurality of contacts and
Relay comprising a contact and a switching contact; one of said contacts and a power supply via the switching contact, image-forming
Power to the electric motor and image forming process equipment
Second DC power source because; through the other one closing contact piece of the contact is powered, means for energizing the third load means of the image forming apparatus; and the main
In-switch and relay contacts and the four power supplies
Between the terminals of the main switch and the relay.
Is a single-phase two-wire connection that is commonly connected to only one phase of the AC power supply
And connection, the contact of the main switch and the relay is a freely switched to a three-phase four-wire connections and which are connected to respective three-phase AC power supply, the main switch of the single-phase two-wire
Connects with the terminal feed line is connected, changeover switch means; MinamotoSo location electrostatic image forming apparatus comprising a. 2. A power supply input terminal to which a three-phase four-wire AC power supply and a single-phase two-wire AC power supply can be connected; a first DC power supply for supplying power to a controller of the image forming apparatus;
And a main switch for opening and closing the power supply path to the first DC power supply
H: an electric coil supplied from the first DC power supply, a plurality of contacts and
Relay comprising a contact and a switching contact; one of said contacts and a power supply via the switching contact, image-forming
Power to the electric motor and image forming process equipment
A second DC power source for supplying power to the other one of the contacts via an opening / closing contact, and supplying current to a third load unit of the image forming apparatus ; a second DC power source connected to a part of the four power input terminals ; detecting means for detecting either is connected to the power supply input 3-phase four-wire system alternating current power source to the terminals and single-phase two-wire alternating current power source; and the Mae
Switch and relay contacts and the four power inputs
Disposed between each terminal for 3-phase in the terminal, their connection status, in accordance with the detection state of the detection means, the main
A single-phase two-wire connection in which the contacts of the in-switch and the relay are commonly connected to only one phase of the AC power supply ;
Switch and relay contacts for each of the three phases of the AC power supply
The main switch automatically switches to one of the three-phase four-wire connections to be connected.
Connected to the terminals, the electromagnetic change-over switch means; MinamotoSo location electrostatic image forming apparatus comprising a.