JPH04104284A - Temperature controlling system for heating roll of printer - Google Patents

Abstract

PURPOSE:To stabilize fixing intensity by controlling the temperature of a heating roll based on the detecting signal from a first and a second temperature sensors. CONSTITUTION:The surface temperature of the heating roll 2 is detected by the temperature sensor 4, on the other hand, the temperature of the use environment of a printer is detected by the temperature sensor 7, and these two detected signals are inputted to a controlling mechanism 9. At this time, the controlling mechanism sends a controlling signal which is previously set based on the temperature of the use environment in order that the surface temperature of the heating roll 2 is heated to the most appropriate temperature to a lamp power supply 10. And the lamp power supply 10 makes a specified current flow in a halogen lamp 5 based on the controlling signal so as to turn on the lamp, and the heating roll 2 is heated. Thus, the temperature control of the heating roll is executed based on the surface temperature of a heating roll and the temperature of the use environment and the ream weight of paper, so that the fixing intensity is stabilized, and a faulty image is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to temperature control of a heat roll for a printing device using an electrophotographic method, and particularly to a control method for controlling the temperature based on the usage environment temperature and the usage rate.

[Conventional technology]

Conventionally, the temperature control method for heat rolls for printing devices has been refined using a heat roll, a halogen lamp, a temperature sensor, and a control circuit.The temperature sensor measures the temperature on the surface of the heat roller, and this detection signal is input to the control circuit. At the same time, a control circuit controls the heat generation temperature of the halogen lamp so that the detection signal remains at a constant value.

[Problem to be solved by the invention]

In the conventional temperature control method for heat rolls for printing devices described above, the temperature of the heat roll surface is controlled to a constant value. Therefore, in a constant temperature environment, the fusing strength is weakened, so it is difficult to touch the paper by hand. If the toner is rubbed or rubbed, the toner falls off the paper and the image disappears, which is particularly noticeable when the paper is moved quickly. Furthermore, in high-temperature environments, the internal temperature of the device increases, which causes the toner to solidify and cause image defects.Furthermore, heat-resistant materials are used for the fixing unit and its surrounding mechanical parts, making it less effective. There was a drawback.

[Means to solve the problem]

In the temperature control of a heat roll used in a fixing unit of a printing apparatus, the present invention detects the temperature of the heat roll with a first temperature sensor, and detects the usage environment temperature with a second temperature sensor. It is characterized in that a temperature control means controls the temperature of the heat roll based on detection signals from the first and second temperature sensors. Further, the speed of the paper being used may be detected by the paper detection means, and this detection signal may be input to the temperature control means.

〔Example〕

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

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2(a) is a configuration diagram showing the temperature control mechanism of this embodiment. In FIGS. 1 and 2(a), a sheet of paper 1 with a toner image is passed between a heat roll 2 and a pressure roller 2, and is heated and pressed. Then, the toner agent is fixed on the paper 1.

The heat roll 2 is made of aluminum or the like and has a cylindrical shape,
Its surface is coated with fluororesin or the like, and a halogen lamp 5 is installed inside. Further, the heat roll 2 is provided with a separation claw mechanism 6 for smoothly separating the paper 1 from the heat roll 2. The heat roll 2 is heated by a halogen lamp 5, and the surface temperature of the heat roll 2 is detected by a temperature sensor 4. On the other hand, the temperature of the environment in which the printing device is used is detected by the temperature sensor 7, and these two detection signals are sent to the control mechanism 9.
is input. Here, the control mechanism sends a control signal predetermined based on the operating environment temperature to the lamp power source 10 so that the surface temperature of the heat roll 2 is heated to an optimum temperature. The lamp power supply 10 turns on the halogen lamp 5 according to a control signal.
In this embodiment, when a predetermined current is applied to the lamp to turn it on and heat the heat roll 2, for example, when the usage environment temperature is 10
℃, the surface temperature of the heat roll is controlled to 175℃, and when the usage environment temperature is 35℃, the surface temperature of the heat roll is controlled to 150℃.

FIG. 2(b) is a block diagram showing the temperature control mechanism of another embodiment of the present invention. In this embodiment, in the embodiment explained in FIG. 2(a), A selection switch 8 for detecting speed is provided, and this detection signal is input to a control mechanism 9. As a result, the control mechanism 9 uses the paper speed as a parameter to perform more appropriate temperature control.

〔Effect of the invention〕

As explained above, the present invention controls the temperature of the heat roll based on the surface temperature of the heat roll, the usage environment temperature, and the paper speed, so that the fixing strength is stabilized and image defects are prevented from occurring. I can do it. Furthermore, since there is no need to use heat-resistant materials for the fixing unit and surrounding mechanical parts, there is an effect that the manufacturing cost of the printing apparatus is reduced.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention;
Figures (a) and (b) are configuration diagrams showing the temperature control mechanism of this embodiment, respectively. 1...Paper, 2...Heat roll, 3...Pressure roller, 4.7...Temperature sensor, 5...Halogen lamp, 6...Separation claw mechanism, 8...Selection switch, 9
...Control mechanism, 10...Lamp power supply.

Claims (1)

[Claims] 1. In controlling the temperature of a heat roll used in a fixing unit of a printing device, a first temperature sensor detects the temperature of the heat roll, and a second temperature sensor detects the operating environment temperature. 1. A temperature control system for a heat roll for a printing apparatus, characterized in that a temperature control means controls the temperature of the heat roll based on detection signals from the first and second temperature sensors. 2. In the temperature control method for a heat roll for a printing device according to claim 1, the paper detection means detects the ream weight of the paper used, and the detection signal of the paper detection means is input to the temperature control means. A temperature control method for heat rolls for printing equipment, which is characterized by: