JPH02148078A - Electrophotography type printer - Google Patents

Abstract

PURPOSE:To prevent the fixing failure at the time of starting even in the source of holding for an arbitrary time by providing a control means for always holding a heat fixing device at a fixing temperature when a power source of the device is turned on and a power source control means for controlling a current supply to a heat source. CONSTITUTION:A heat fixing device 1 consists of a heat roller 1c into which a heat source 1b is inserted and which is attached to a frame 1h so as to be freely rotatable through a bearing 1e, a pressure roller 1d which is pressed against the roller 1c with a spring 1g through a bearing 1f, and a temperature detector 1a which is pressed against on the roller 1c. A body control means 4 detects turn-on of a power source, reads a temperature of the roller 1c through a temperature control means 3 from the temperature detector 1a and compares it with a fixing temperature, generates a holding instruction or a printing instruction to a power source control means 2, and controls the temperature of the roller 1c. When the temperature of the roller 1c is lower than the fixing temperature, it is controlled to the fixing temperature during some time even in the course of a holding instruction and the fixing failure at the time of starting is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat fixing device for an electrophotographic printer, and more particularly to a temperature control mechanism of the heat fixing device when the main body of the device is started up.

[Conventional technology]

Conventionally, in the temperature control method of this type of thermal fixing device, the temperature is controlled to be lower than the fixing temperature when the main body of the device is in standby mode.

[Problem to be solved by the invention]

In the conventional temperature control method of the thermal fixing device described above, when the power to the main body of the device is turned on, it is assumed that the device is in standby mode, and the temperature is adjusted to the temperature of the fixing device. It has the disadvantage of causing defects.

An object of the present invention is to provide an electrophotographic printer that solves the above problems.

[Means to solve the problem]

In order to achieve the above object, the electrophotographic printer according to the present invention includes a thermal fixing device that fixes the toner image transferred to the recording material by heat and pressure, and a temperature sensor that detects the temperature of the thermal fixing device. , a first stage of temperature control for controlling the temperature sensor, and during a standby period when no printing command is received, the temperature control means is controlled at a temperature lower than the fixing temperature of the heat fixing device, or current is supplied to the heat source. a control means for issuing a command to intermittently stop the heat fixing device and a command to keep the heat fixing device at the fixing temperature for a given time even if no printing command is received when the device is powered on; and a heat source controlled by the temperature control device. It has one stage of power supply controller for controlling the supply of current f to the motor.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a schematic diagram of an embodiment of the present invention. The heat fixing device 1 is supported by a heat roller IC equipped with N resin 1 which is rotatably fixed to a frame 1h via a bearing 1e, and a support member 1j inserted into the heat roller IC and fixed to the frame 1h. The heat source 1b is connected to the heat roller I via the bearing 1f.
It consists of a pressure roller 1d that is pressed against C by a spring 1g, and a temperature sensor 1a that is pressed against a heat roller IC.

The heat source 1b is connected to a power supply control means 2, and the power supply control means 2 is connected to the main body control means 4 by a signal line 2b. The temperature sensor 1a is connected to the temperature control means 3 and the signal line 3
It is connected to the main body control means 11 by a. The temperature control means 3 and the power supply control means 2 are connected by a signal line 2a.

First, when the main body control means 4 detects that the power of the main body is turned on, the temperature sensor 1a sends the heat roller 16 through the temperature control means 3.
Read the temperature TO. Temperature T.

or lower than the fixing temperature 'r11, the power supply control means 2
A current is supplied to the heat source 1b. If 1"O>Th, the temperature control means 3 and the power supply control stage 2 control the heat roller 1c according to the timing command or printing command according to the command of the main body control means 4.
control the temperature of the

To (In the case of Th, even if the command of the main body control means 4 is a timing command, the temperature of the heat roller 1c reaches the fixing temperature]゛h, the temperature of the heat roller 1C remains at the fixing temperature Th for 1 second. Control temperature.

〔Effect of the invention〕

As explained above, the present defense is that when the main body of the apparatus is started up, the temperature of the heat roller of the fixing device is kept at the fixing temperature for an arbitrary period of time even during the standby period, thereby preventing fusing defects at startup. There is an effect that can be done.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the present invention. 1... Heat fixing device 1a... Temperature detector 1b
...Heat source IC...Heat roller 1d...
Pressure roller 1e...Bearing 1f...Bearing
1g...Spring 1h...Frame 11
...Nya 1 j...Supporting material 2...Power control means 3...Temperature control means 4...Main body control means 2a...Signal line 2b...Signal line 3a
···Signal line

Claims (1)

[Claims] (1) A heat fixing device that fixes the toner image transferred to the recording material by heat and pressure, a temperature sensor that detects the temperature of the heat fixing device, a temperature control means that controls the temperature sensor, and a print command. During the standby period when no reception is received, a command is given to the temperature control means to control the temperature at a temperature lower than the fixing temperature of the heat fixing device or to intermittently stop the current supply to the heat source, and when the power of the device is turned on, a command is issued for an arbitrary period of time. The present invention is characterized by comprising a control means for issuing a command to maintain the heat fixing device at a fixing temperature even when a printing command is not received, and a power supply control means for controlling current supply to a heat source controlled by the temperature control means. Electrophotographic printer.