JPS5863972A - Safety device of heat fixing device - Google Patents

Abstract

PURPOSE:To avoid the fuming of a fixing roll as well as the bend of an outer cover, by connecting in series the heat source of a heat fixing device, the temperature fuse and a heat generator and setting the temperature fuse close to the heat fixing device and the heat generator close to the temperature fuse respectively. CONSTITUTION:The heat source 3 of a heat fixing device, the temperature fuse 6 and a heat generator 8 are connected in series. The fuse 6 is set close to the heat fixing device, and the generator 8 is set close to the fuse 6. In such way, the ventilation is prevented at the area near the fuse 6, and the fuse 6 is fused assuredly when the fixing device has an abnormal rise of temperature. Then a power supply circuit of the fuse 6 is turned off. As a result, the fuming of a fixing roll or the bend of the outer cover of a copying machine can be previously avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a safety device for a heat fixing device, lf#t;
This is related to the fixing arrangement of the IIE photocopier.

Usually, a fixing device using a fIIk roll as a heat source is as shown in Figure 1-2.
- The fixing roll 2 is pressurized, and a heat source S such as a damping is provided in the fixing roll 2, and the front surface 6 of the fixing roll 2 is provided; II Lies (Ta 1 Direct Senna-4 and Cheerful Temperature 111fil15ζ:Yo evening, the temperature of the above heat a3 is 111fil15ζ), and the surface d1 of the fixing roll is heated to around the fixing temperature of the developer 6; Leaking and holding.

The above heat 13 is connected to the power supply circuit 7I via the heat source 6 as shown in the diagram 182. Therefore, this power supply circuit 7, temperature stripe circuit 3165 or concentration sensor 4 is
L, '1R711Cx-Jl-2 1 malfunction 1: The power circuit of heat 13 continues to turn on, and the temperature of the fixing roll 2 rises, creating a risk of fire. Near 2-: The above aX heats 6 arranged t are connected, and the heat a
It's 15I, when the canister to 5 stops.

However, if the heat capacity of J10-Rule 2 is small i.

Also, the 11% cost of part-6 is urgent (if fever is high).

Or around 8ml-Needs 6 6: In cases where there is ventilation etc. (:j), the temperature raising device in Needs 6 cannot keep up with the rising speed Kt=1 of the filtration of the fixing roll 2.

As a result, before the fuse was blown at the rated power of 1, there were 6 inconveniences such as generation of smoke due to fuser roll 2 and heat of the outer area cover of the copying machine.

It is an object of the present invention to provide a safety device for a thermal fixing device that eliminates the above-mentioned inconveniences, and as shown in Figure 5C, one temperature fuse 6 is arranged near the second heating element 8t.
-,! 14 Figure 1: Show! jrJ & [5, d! Sequentially in series with II Hiase 6 1: Connected 1 - Register 1. Take the heating element 8, then Nichrome...Q Danfun 1 etc. tm
-ru.

Since the present invention has the above-mentioned configuration, when the power 1 @ miscellaneous 7 of 11i4 defective I: hot #I5 is turned on and the fixing roll 2 rises by J% 1, the heating element 84 generates heat. continue.

This lick temperature fuse 6 is heated from both the constant 40-ru 2 and the heating element 8. .

) Above-! 111 up to 6 and fixed 4 call 2
1111 and -4 between temperature fuse 6 and heating element 8 is fixing temperature 1 heat generation of heating element 8 1 (1 cost electricity), ・"Jaku fuse 5 fixed damage, fixed 41s whole Wakiyonro and late Urakari etc.C
;Yo1. ff1A and experimental C: found jL6.

One side of the temperature fuse 6 and the fixing roll 2 is the temperature of the fixing roll 2.

Also, ff1l! The structure of the fuse 6 and the heating element 8 can be freely considered, but as shown in Fig. 115 and Fig. 186, the heating element 8 surrounds the temperature and the need 6, and the opening 1191 of the heating element 8, the fixing roll 211ε= When placed facing the
11! [Ventilation near the fuse is obstructed and the temperature is high.]
The happy decision of Z6 is certain 1: It will be done. In FIG. 5, numeral 10 indicates a lead assembly for a temperature fuse and a heating element.

As described above, the present invention is based on the careful consideration of the thermal fuser, the temperature fuse, and the heating element 1a order series 1: *Continued, the thermal fuser near-1:
This is a configuration in which the above-mentioned warming heater is placed, and the above-mentioned heating element is placed in the vicinity of the leg i1 degree pus, -1, so it is 11!
The temperature and needs are: 1: When the temperature of the fuser rises abnormally, the power supply circuit of the temperature fuse is turned on when the temperature rises to 1:42 m to prevent the occurrence of problems such as 9 when the copying machine exterior cover is turned on while the fixed roll is smoking. You can get the desired effect.

[Brief explanation of drawings]

Figure 1 is a side view showing a general outline of a conventional fixing device, Figure M2 is an electric circuit diagram of the fixed IS, and Figure 115 is a side view of a conventional fixing device. A side view showing the W1 main point of the fuser with all the equipment kA, and Figure 4 shows the electricity Bj of the fuser! Figures and MS diagrams show the composition of the heating element and the heating element. 66° 1 is the press roll, 2 is the fixing roll, and 5 is the mtalt. 4 is ii * cent - 15 is 1 + l 14 circumference, 6 is - fuse, 7 is electric 11 [ & U 18.8 is heating element, 9 is 1 day - 110 is lead wire.

Claims (1)

[Claims] (1) The heat source of the heat fixing device, the temperature fuse, and the wax body are connected in series, and the 11 m fuse is placed near the heat fixing device. A safety device for the heat fixing device, which is specially designed to ensure the safety of the body.