JPH02297578A - Fixing device for recorder or the like - Google Patents

Abstract

PURPOSE:To make wiring sure and to maintain and stabilize image forming process conditions by forming a heat-resistant synthetic resin forming member equipped with a groove, to which a part of a lead wire for a heater, a thermistor, etc., is fitted, as a fixing base covering the lower part of a fixing device. CONSTITUTION:A pressure roller 14 and a fixing roller 15 are rotatably mounted to the fixing cover 11a of the fixing device 11 in the direction of the arrow in figure. The fixing roller 15 incorporates the heater 16, and the thermistor 17 for detecting the surface temperature of the fixing roller and a thermostat 18 preventing an excessive rise in the temperature are arranged on the lower part of the fixing roller 15 so that they are close to the surface of the fixing roller 15. The fixing base 20 is arranged to cover the overall lower part of the fixing device 11, and the lead wire burying groove 21 of the thermistor 17 and the lead wire burying groove 22 of the thermostat 18 are provided at the bottom of the fixing base 20. Consequently, wiring is made sure and assembly is improved.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a fixing roller equipped with a heater, a thermistor that detects the surface temperature of the fixing roller, and a thermostat or temperature fuse that prevents the temperature of the fixing roller from rising. The present invention relates to a fixing device for a recording apparatus comprising:

[Conventional technology]

In a fixing device of the type described in the industrial application field, the lead wires of each electrical component are generally wired while being held and attached to a sheet metal device frame using a special clamp member, a leaf spring, or the like. In such a wiring method, it is difficult to know where to pass the lead wires, and the work is troublesome and tends to be inaccurate. Furthermore, when the lead wires are directly attached to the sheet metal frame, it is difficult to avoid sharp edges, resulting in inconvenient situations such as bending of the wires. Furthermore, the lower part of the fuser is exposed as metal.

They were unable to escape the disadvantage of rising cabin temperatures.

[Problem to be solved by the invention]

An object of the present invention is to simplify the wiring of electrical components of a fixing device such as a heater, a thermistor, a thermostat, or a temperature fuse, to cut off heat from the heater, and to reduce the temperature rise inside the recording device. The purpose is to maintain and stabilize the image forming process conditions and to ensure safety, and to prevent troubles such as burns when taking out the fixing unit during maintenance and replacement.

[Means to solve the problem]

According to the present invention, a heat-resistant synthetic resin molded member having a groove for attaching a part of the lead wire of a heater, thermistor, thermostat, or temperature regulator XI is formed as a fixing base that covers the lower part of the fixing device. This is solved by

〔Example〕

In the laser printer shown in FIG.
A paper feed cassette 2 is removably loaded therein. Recording paper 4 fed in the direction of arrow A from paper feeding device 3 is timed by a pair of registration rollers 5 and transported to a latent image carrier consisting of a photoreceptor 6 on a drum. The photoreceptor 6 is rotationally driven in the counterclockwise direction in FIG. 1, and at this time, the surface is charged by the charging charger 7 and is irradiated with laser light from the laser optical system 8 to form an electrostatic latent image on the photoreceptor. . This latent image is made visible by toner when passing through the developing device 9. This visible image is transferred to the recording paper 4 conveyed to the photoreceptor 6 by the transfer/separation charger 10,
The recording paper 4 that is in close contact with the photoreceptor 6 is electrostatically separated. Thereafter, the recording paper 4 is conveyed to the fixing device 11, the visible image on the recording paper 4 is fixed by the fixing device, and the recording paper 4 is discharged to the discharge section 12 in the direction of arrow B. On the other hand, photoreceptor 6 after visible image transfer
is a cleaning device 1 having a cleaning blade.
The residual toner is removed by the cleaning device 13, and the removed toner is collected by the cleaning device 13.

2 and 3, the fixing force of the fixing device 11/
A pressure roller 14 and a fixing roller 15 are rotatably mounted in the illustrated arrow direction. Fixing roller 15
has a heater 16 inside, and a thermistor 17 for detecting the surface temperature of the fixing roller on the lower side of the fixing roller.
A thermostat 18 for preventing excessive temperature rise is arranged close to the surface of the fixing roller. 19 is a separation claw, and 20 is a fixing base arranged to cover the entire lower part of the fixing device according to the present invention. The fixing base 20 is molded from a heat-resistant resin such as PET or PC.

4 and 5, a groove 21 for embedding the lead wire of the thermistor 17 and a groove 22 for embedding the lead wire of the thermostat 18 are provided on the bottom surface of the fixing base 20. 17
' and 18' indicate the mounting positions of the thermistor 17 and thermostat 18, and 23 indicates a fitting member that prevents the lead wire from floating up from the groove 22 and coming off.

〔Effect of the invention〕

By providing the fixing base of the present invention, it is possible to wire each lead wire of the electrical component while embedding it in the groove, ensuring reliable wiring and improving ease of assembly.Furthermore, the fixing base is made of heat-resistant synthetic resin. covers the bottom of the fixing device, which blocks heat from the fixing roller, reduces temperature rise inside the recording device, reduces the impact on single-image processing conditions, provides stable images, and meets safety standards. It is also convenient for clearing the upper temperature limit.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a laser printer to which the present invention is applied, FIG. 2 is a cross-sectional view 1 of a fixing device, FIG. 3 is a vertical cross-sectional view of the fixing device, and FIG. 4 is a diagram of a fixing base configured according to the present invention. The sectional view and FIG. 5 are plan views of the fixing base. 1... Laser printer 11... Fixing device 15... Fixing roller 16... Heater 17... Thermistor 18... Thermostat 20... Fixing base

Claims (1)

[Claims] In a fixing device of a recording apparatus, which includes a fixing roller equipped with a heating heater, a thermistor that detects the surface temperature of the fixing roller, and a thermostat or a temperature fuse that prevents the temperature of the fixing roller from rising excessively, the heating heater, thermistor, A fixing device characterized in that a heat-resistant synthetic resin molded member having a groove for attaching a part of a lead wire of a thermostat or a thermal fuse is formed as a fixing base that covers a lower part of the fixing device.