JPS62206575A - Fixing device - Google Patents

Abstract

PURPOSE:To reduce the energy by controlling the temperature of a fixing heater only when an image is formed and turning off the power to the fixing heater when a device is held. CONSTITUTION:Fixing heaters 21 and 21 are turned on through a control circuit 30 and a heater driver 31 when a copy switch 17 is depressed, and a normal copy sequence is executed when the surface temperatures of fixing rolls 20 and 20 reach a prescribed value thereafter. Temperatures of fixing heaters 21 and 21 are controlled only when the copying operation is performed, and power supply to fixing heaters 21 and 21 is turned off when the device is held after the copying operation. Thus, the personal copying is contrived with the conserved energy.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a fixing device using an image forming apparatus in which a heat exhaust fan that exhausts heat generated from a fixing heater to the outside of the machine body is inactive except during image formation. Regarding.

(Prior Art) Conventionally, as shown in FIG. 5, a copying machine using a heat fixing device using a halodane heater as a heat source raises the temperature inside the machine by a fixing device 101 or uses a light source for exposure, such as a halogen rung 103.
A single fan 102 was used to exhaust the increased temperature to the outside of the aircraft body 100.

[Problem that the invention seeks to solve]

By the way, in the conventional structure described above, in addition to controlling the fuser 101 at a predetermined temperature, for example, 160° C., even when copying is not being performed, that is, during standby, the fan 102 is also rotated even during standby. It was necessary to remove the heat. Therefore, the motor 1 for driving the fan 102
Since the motor 02a is constantly rotating while the main switch 104 is on, the wind noise during standby becomes a noise for the user, and the motor 102a is also treated as an expensive item due to cost competition in recent years. The cost is high due to
There was a problem with that.

Therefore, the present invention has been made to solve the above-mentioned problems of the conventional example, and its purpose is to prevent noise during standby and to reduce costs.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, the heat exhaust fan that exhausts heat from the fixing heater to the outside of the machine is inoperable except during image formation. This fixing device uses an image forming apparatus according to the present invention, and is configured such that the temperature of the fixing heater is controlled only during image formation, and the power to the fixing heater is turned off during standby.

(Function) In the present invention, the heat exhaust fan outside the image forming apparatus is not operated, the temperature of the fixing heater is controlled only during image formation, and the fixing heater is not energized during standby, thereby saving energy. The aim is to

(Example) The present invention will be explained below based on the illustrated example. A second diagram showing an electrophotographic copying machine to which the constant N device according to the present invention is applied.
In the figure, reference numeral 1 denotes a document mounting table which is made of a transparent member and moves back and forth, and is provided at the upper part of the body 10. Reference numeral 2 denotes a condensing light transmitting body that exposes a light image of the original on the original table L onto the photosensitive drum 3 through a slit, and the photosensitive drum 3 rotates in the direction of the arrow. 4 is a Corona Teidenki, which charges the photosensitive drum 3 uniformly. A developing device 5 exposes the uniformly charged photosensitive drum 3 to a light image using the condensing light transmitting member 2 to visualize an electrostatic latent image.

On the other hand, a transfer paper P as a recording material is stored in a cassette 11, is fed onto the drum surface by a paper feed row 26 and a resotrol rough, and the image on the photosensitive drum 3 is transferred by a transfer charger 8. Thereafter, the transfer paper P is separated from the photosensitive drum 3 by the separating means 9, sent to the belt unit 12, sent to the fixing rollers 20, 20, and discharged onto the tray 13.

Further, the toner remaining on the photosensitive drum 3 is scraped off by the cleaning means 14 and collected.

J [K, 15H halo rung, 16 is a heat exhaust fan,
The heat generated from the fixing heaters 21 and 21 of the fixing rows 220 and 20 is exhausted to the outside of the body 10.

Next, FIG. 1 is a schematic view of the main parts of an embodiment of the fixing device according to the present invention. It is rotated by receiving driving force from the rotating shaft of the motor 25 via the belt 29. 26a.

26b are heat exhaust fans 16. This is a gooley attached to the main motor 25. As a result, the heat exhaust fan 16 rotates only while the main motor 25 is rotating, that is, during the image forming operation.

In the above configuration, the temperature of the fixing device is v4t as in the conventional example.
- If the operation is carried out at a predetermined temperature, for example 160°C, even during standby, the temperature inside the aircraft 10 will rise, which will have an adverse effect on various parts, but in this embodiment, the copy switch is (indicated by reference numeral 27 in FIG. 1) is pressed, the fixing heaters 21, 21 are turned on, and then the fixing roller 2
20. When the surface temperature of 20 reaches a predetermined temperature, a regular copy sequence is executed. During this time, the main motor 25 continues to rotate, which has the effect of clearly informing the user that the copy operation has been accepted.

Further, the wait rung 28 also starts blinking at the same time as the copy switch 27, and when the fixing rollers 20 and 20 reach a predetermined temperature, it changes to a lit state, and then.

When the copying is completed, the light goes off again.

Therefore, in this embodiment, the temperature control of the fixing heaters 21, 21 can be controlled during copying without attaching a dedicated motor to the heat exhaust fan 16 that exhausts the heat generated from the fixing heaters 21, 21 to the outside of the machine 10. fixing heaters 21 and 2 during standby.
1 is turned off.

The present embodiment described above is carried out by a control system shown in FIG. That is, when the copy switch 27 is pressed, the control circuit 30. Fixing heater 21 via heater driver 31t
is turned on and when copying is completed, the fixing heater 21 is turned off.

(Effects of the Invention) The fixing device according to the present invention has the above-described configuration and function, and can prevent noise during standby and reduce costs. This has the effect of realizing energy savings.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the main parts of an embodiment of a fixing device according to the present invention, FIG. 2 is a configuration diagram showing an electrophotographic copying machine to which the embodiment is applied, and FIG. 3 is a timing chart of the embodiment. 4 is a block diagram showing the control system of the same embodiment, and FIG. 5 is a schematic diagram showing an example of a conventional 9-sonal copy. Explanation of code 1O... Aircraft 16... Heat exhaust fan 20
... Fixing roller 21 ... Fixing heater Fig. 1

Claims (1)

[Claims] A fixing device using an image forming device in which a heat exhaust fan for discharging heat generated from a fixing heater to the outside of the machine body is inactive except during image formation, and the temperature of the fixing heater is controlled only during image formation. . A fixing device, wherein power to the fixing heater is turned off during standby.