JPS6395470A - Controller for driving cooling fan of copying machine - Google Patents

Abstract

PURPOSE:To quickly cool the inside of a copying machine, by constituting the machine provided with a control means which turns on/off a cooling fan driving motor in accordance with the detected temperature of the inside. CONSTITUTION:The titled machine is provided with a control means 1 which turns on/off a motor 8 for driving a cooling motor 7 served as cooling the inside of a copying machine in accordance with the detected temperature of the inside. The machine is composed of a function that the cooling fan 7 is not driven when the inside temperature is sufficiently low but the fan 7 is driven continuously when the temperature is high even if the last copying work is completed, asynchronously to the copying process, is realized. Therefore, a cooling fan drive controller for copying machine which can quickly cool the inside of a copying machine can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling fan drive control device for a copying machine for cooling the inside of the copying machine.

[Prior art]

Conventionally, a cooling fan drive control device for a copying machine has been configured to drive the cooling fan in conjunction with a print switch that starts copying, regardless of the temperature inside the copying machine.

However, with the above conventional configuration, the temperature inside the copier is sufficiently low, such as after a long time has passed since the last copy.
Even when there is no need to drive the cooling fan, the cooling fan is driven in conjunction with the printed switch, which has the disadvantage of wasting power.

On the other hand, when copies are made continuously, even though the inside of the copying machine is hot, after the last copy is completed,
Since the driving of the cooling fan is immediately stopped, a situation arises in which it takes a long time for the temperature inside the copying machine to drop, as shown by the curve β in FIG.

[Purpose of the invention]

The present invention has been made in consideration of the above-mentioned conventional problems, and reduces power consumption by not driving the cooling fan when the temperature inside the copying machine is sufficiently low. Provided is a cooling fan drive control device for a copying machine that is capable of rapidly cooling the inside of the copying machine by continuing to drive the cooling fan until the temperature drops even after the last copy is completed when the copying machine is at a high temperature. This is the purpose.

[Structure of the invention]

In order to achieve the above object, the cooling fan drive control device for a copying machine according to the present invention controls the motor for driving the cooling fan for cooling the inside of the copying machine to 0N10 according to the detected temperature inside the copying machine. The cooling fan is equipped with a control means that causes the cooling fan to operate asynchronously with the copying process, when the temperature inside the copying machine is sufficiently low, and when the temperature inside the copying machine is high, the cooling fan is turned off. The present invention is characterized in that the cooling fan can continue to be driven even after the last copy is completed.

〔Example〕

An embodiment of the present invention will be described below based on FIGS. 1 and 2.

The control means 1 consists of a temperature sensor 2, resistors 3 and 4, a transistor 5, and a relay 6, as shown in FIG. The output of the temperature sensor 2 is grounded via a resistor 3 and a resistor 4, and the base of a transistor 5 is further connected to the connection point between the resistors 3 and 4. These resistors 3
- The value of 4 is set so that when the temperature inside the copying machine exceeds a predetermined temperature, the output of the temperature sensor 2 divided by the resistors 3 and 4 turns on the transistor 5. On the other hand, the collector of the transistor 5 is connected to a power supply for the relay, and the emitter is grounded via the excitation coil 6a of the relay 6.

Further, one of the normally open contacts 6b of the relay 6 is connected to one of the motor power sources via the motor 8 that drives the cooling fan 7, and the other is connected to the other motor power source.

In the above configuration, the temperature inside the copying machine is a, and the time is A.
If continuous copying is started at the time , the temperature inside the copying machine starts to rise as shown by curve α in FIG. 2, but transistor 5 remains OFF until time B when the temperature reaches b. Since relay 6 is not energized and power is not supplied to motor 8, the cooling fan is not activated. However, since the temperature inside the copying machine is low to begin with, the degree of temperature rise is almost the same as when it is being moved.

When the temperature inside the copying machine exceeds b, the transistor 5 turns O.
NL, the relay 6 is energized and the normally open contact 6b comes into contact, power is supplied to the motor 8, and the cooling fan 7 starts to be driven. Furthermore, as copying continues, the temperature inside the copying machine continues to rise, and at time CT, the temperature inside the copying machine reaches C, and is in an equilibrium state.

Next, when the last copy is completed at time C, the cooling fan 7 continues to be driven, so the temperature inside the copying machine quickly drops as shown by the curve α in FIG. temperature is b
When the temperature drops to this level, the transistor 5 is turned off, the relay 6 is deenergized, the normally open contact 6b is opened, the power supply to the motor 8 is cut off, and the driving of the cooling fan 7 is stopped.

In this embodiment, the temperature at which the cooling fan 7 starts driving and the temperature at which it stops are set to be the same, but hysteresis may be provided depending on the heat dissipation characteristics of the copying machine.

〔Effect of the invention〕

As described above, the cooling fan drive control device for a copying machine according to the present invention controls turning on/off the motor that drives the cooling fan for cooling the inside of the copying machine according to the detected temperature inside the copying machine. It is a configuration equipped with means. This reduces power consumption by not driving the cooling fan asynchronously with the copying process when the temperature inside the copying machine is sufficiently low, and also reduces power consumption when the inside of the copying machine is hot. Even after copying is completed, the cooling fan continues to be driven until the temperature drops, resulting in the effect that the inside of the copying machine can be cooled quickly.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a circuit diagram and FIG. 2 is a graph showing temperature changes inside the copying machine during continuous copying. - 1 is a control means, 7 is a cooling fan, and 8 is a motor.

Claims (1)

[Claims] 1. The motor that drives the cooling fan for cooling the inside of the copying machine is turned on according to the detected temperature inside the copying machine.
1. A cooling fan drive control device for a copying machine, comprising a control means for turning off the cooling fan.