JPS59172667A - Heat fixing method - Google Patents

Abstract

PURPOSE:To improve the stability of fixation by heating the surface of a form by a hot blast and then heating toner and the form surface uniformly. CONSTITUTION:Air is sent in an air heating device 6 by a fan 10 and heated, and the heated air is sent in a hood 8 through a pipe 7 to raise the ambient temperature. The form 1 is conveyed right under the hood 8 while toner 2 sticks thereto. The toner when entering the hood 8 is fused as the temperature rises by the heated air. The form surface is also heated as well as the toner and the toner penetrates the form surface. The toner when exiting from the hood 8 is solidified by being cooled by ambient air, thus completing fixation. Even when the form 1 is thick, the toner 2 and ground surface of the form are heated sufficiently and the degree of fixation of the toner is stabilized regardless of variation in toner area.

Description

DETAILED DESCRIPTION OF THE INVENTION This term refers to a method used in copying and printers.

Conventional 51! An example of the pre-preparation method (i=*1 shown in the figure).

In the figure, (1) is paper, and (2) is toner, which is a mixture of pigments such as fat and carbon black that melt when heated, and is finely crushed.This is used to express characters and images. Ru. (3) (is p, +f'2 plate, usually +50°C +
In some cases, a metal plate heated to 200°C and brought into close contact with the paper is used. (4) is an infrared lamp, which is used to pull the toner into the main body. (5) is a symbol representing that the paper moves four times.

Next, I will explain works 1 and 11. Toner (2) adheres to paper (1) on the left side of FIG. Paper (1)
is conveyed in the finishing direction at (5), and eventually enters a heat fixing device consisting of a hot plate (3) and an infrared lamp (4). Both the paper (1) and the toner (2) are heated by the heat from the hot plate (3) and the heat from the infrared lamp (4), and eventually melt into the toner (2) and soak into the surface of the paper. Thereafter, the toner that leaves the thermal fixing device as the paper is transported changes from a molten state to a solid state as it cools down, completing fixing.

The conventional heat fixing method is as described above, so that the heat from the hot plate does not directly lower the temperature of the toner, but rather raises the temperature of the entire paper and then heats the toner. Therefore, when the paper is thick, a large amount of energy is required to heat the toner. Furthermore, the heat from the infrared lamp has the disadvantage that the direct heating element of the toner due to radiation is too large, and the degree of fixing varies greatly depending on the change in the toner adhesion area on the paper.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional method. By heating the paper surface with heated air, the toner and paper surface are evenly heated, and the stability of the fixing degree is improved. The purpose of the present invention is to provide a method that can save energy by increasing the energy consumption and avoiding unnecessary heating of paper.

An embodiment of the present invention will be described below with reference to the drawings. Second
In the figure, (6) is a device that heats the air, (7) is a pipe that carries the heated air, (8) is a hood that surrounds the heated air, and (9) is a fan, which is a flow channel for heated air. make. aO is a symbol indicating air flow.

Next, the operation V will be explained. Fan 01 is empty.
-C is fed into the air heating device (6) and heated. The heated air is sent through the pipe (7) to the MUv and into the hood (8), raising the atmospheric temperature inside the hood (8).

On the other hand, the paper (1) is completely conveyed directly under the hood (8) with unfixed toner (2) attached thereto. When the toner on the paper enters the inside of the hood (8), its temperature increases due to the heated air, and it eventually becomes molten. The surface of the paper is heated in the same way as the toner, and the molten toner easily soaks into the surface of the paper. Since the paper is being conveyed, the molten toner will eventually come out of the hood (8). Then, the toner is cooled by the surrounding air and becomes solid, completing fixing.

The paper (1) and toner (2) are heated by heated air, so even if the paper (1) is thick, the toner (2) and the surface of the paper can be sufficiently heated by the door. , Jl, and requires less heating energy than conventional methods. Furthermore, since air heating is used, the degree of toner fixation is stable regardless of changes in toner area, compared to heating by radiation from an infrared lamp. Furthermore, deterioration of the paper due to unnecessary heating is also eliminated.

In the above embodiment, the heated air for fixing ends up being thrown away to the surroundings, but this can be recovered and used to heat the air entering the air heating device. Alternatively, it may be configured as part of the heat source of an air heating device.

In this modification, the energy required for air heating can be reduced.

As described above, according to the present invention, since both the toner and the paper are heated from the surface of the paper using heated air, the degree of fixing is uniform, and the degree of fixation is uniform. ! Ni・11.
”', 5 j (The effect of reducing energy is
Chiru.

41λ1 simple i゛・:Here j'(r, Figure 1 (Key) Three-dimensional diagram showing the conventional heat fixation method,
21. (1) is a three-dimensional diagram showing an embodiment of the heat fixing method according to the present invention.

In the figure, (1) is the paper, (2) is the toner, (6) is the air heating device, (7) is the key pipe, and (8) is the hood.

The same reference numerals in each figure indicate the same or equivalent parts.

Agent Shin Kuzuno Figure 1 Figure 2

Claims (1)

[Claims] 704 The toner on the bottom and paper is heated with heated air,
jpL L Upper - Heat fixing method to fix the old toner to the above paper.