JPS5811977A - Controlling method for fixing temperature of electronic copying machine - Google Patents

Abstract

PURPOSE:To simplify temperature control and to reduce the consumption of electric power by simultaneously turning on plural heat sources of a fixing device at the time of warming-up and, after the warming-up, controlling only the heat source to obtain a constant fixing temperature. CONSTITUTION:When a power saving switch 14 attached to the body 1 of an electronic copying machine is turned on, plural heat sources 2 accomodated in a fixing roller 4 are simultaneously turned on, heating the fixing roller 4 for a short time. When a temperature detector 6 detects that the surface temperature of the fixing roller 4 reaches a fixing temperature T1, respective heat sources 2, 3 are turned off and then only one heat source 2 is turned on/off under control, controlling the surface temperature of the fixing roller 4 at the fixed fixing temperature T1. As compared with a controlling method for controlling a heat source with higher heat capacitor, this method makes it possible to attain simple and highly accurate temperature control. In addition, the power reduction switch 4 keeps lower temperaure than the temperature set at the standby state, reducing the power consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fixing temperature control device for an electronic copying machine equipped with a fixing device having at least two heat g's.

Conventionally, most electronic copying machines equipped with a heat fixing device have used a single heat source for the fixing device. Therefore, it takes a long time for the fixing device to reach the fixing temperature. In addition, heat sources with a large heat capacity are used to shorten the warm-up time, but heat sources with a large heat capacity consume a large amount of power and are uneconomical, as well as making it difficult to control the temperature after the temperature reaches the fixing temperature. There were drawbacks.

This invention has been made to eliminate this drawback.The fixing device has multiple heat sources, and during warm-up, the multiple heat sources are turned on at the same time, and after warm-up, a single heat source is controlled to maintain a constant fixing temperature. The electronic F! The present invention provides a method for controlling the fixing temperature of a J photocopier, and attempts to facilitate temperature control and save power.

Hereinafter, one embodiment of the method of the present invention will be described in detail with reference to FIG. FIG. 1 shows a fixing device A provided in an electronic copying machine main body 1, which includes a fixing roll 4 equipped with a plurality of heat sources 2.3', for example, two heat sources, and a sheet (not shown) to be fixed on the fixing roll 4. (1) The surface temperatures of the pressure roll 5, the roller 9, and the fixing roll 4, which are completely pressed together, are constantly detected by the temperature detector 6. Further, as shown in FIG. 2, the electronic copying machine body 1 has a structure in which an internal mechanism 8 including a photoreceptor 7 can be opened upward, and an interlock switch 9 is opened when the internal mechanism 8 is opened.
is turned off, and an operation panel 13 with various operation switches 11 including a power saving switch 10 and a display 12 is provided at an easy-to-operate position on the main body 1, and a power switch 14 is provided on the side of the main body 1. ing.

However, when the power switch 14 of the main body 1 is turned on, a plurality of heat sources m2 and 3 provided in the fixing roll 4 are simultaneously turned on, and the fixing roll 4 is heated in a short time. When the temperature detector 6 detects that the surface temperature of the fixing roll 4 has reached the fixing temperature 1.1, each heat source 2.3 is turned off, and from then on, one heat source #! , 2 are controlled to blink, and the surface temperature of the fixing roll 4 is controlled to a constant fixing temperature KTt shown in FIG. In addition, if a paper jam occurs during t-separation and the internal mechanism 8 is opened upward, the heat sources 2 and 3 are also turned off by turning off the ink lock switch 9, and the paper jam is cleared and the internal mechanism is opened again. When the mechanism 8 is put into the main body 1, the interlock switch 90 is turned on and the heat sources 2 and 3 are turned on simultaneously, and the surface temperature of the fixing roll 4 is heated until it reaches T1, and thereafter, one heat source 2 is used to maintain a constant temperature as described above. Vorticity T, t
IC controlled.

On the other hand, if the node γd switch 10 is turned on while copying is in progress,
The control temperature set value decreases to 12, and from then on, the surface temperature of the fixing roll 4 is controlled by this time T2, and at the time of koji copying, ffl'i'ri! When the switch IcI is turned off, both heat sources 2 and 3 are turned on, and the surface temperature of the fixing roll 40 reaches the fixable temperature in a short time, and thereafter the temperature is controlled to this temperature T.

Incidentally, in the above embodiment, a lifting platform with two heat #2 and #3 grapes was described, but of course, two or more may be used.

As described in detail above, this invention simultaneously ignites the heat sources of the number of warm-up phases to fully heat the fixing roll, so that the surface temperature of the fixing roll can be raised to the fixable temperature in a short time, and the warm-up time can be increased. You can write short stories. In addition, when the surface temperature of the fixing roll reaches the jump temperature, only a single heat source is controlled to maintain the set temperature, compared to conventional systems that control a heat source with a large heat capacity. It is easy to control and highly accurate temperature control is possible, and if a "W power switch is installed to keep the temperature lower than the set temperature during standby, it is possible to reduce power consumption in constant H/B equipment." Now you can also plan, and even more wI
After the m switch is released, by turning on all the heat lamps to heat up to the set temperature, the set temperature can be returned to the set temperature in a short time of 1'lri.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a perspective view of the foot adjustment device, Fig. 2 is a side view of the photographic machine body, Fig. 3 is a front view of the operation panel, and Fig. 4 is a control. It is a line diagram showing a shape. A is a fixing device 6. 2 and 3 are heat sources, 14 is a power switch,
T1 is the mud layer temperature. Applicant Fuji Xerox Co., Ltd. Agent Patent Attorney Masaaki Yone Patent Attorney Tadashi Hyomoto Figure 3 0 @ Figure 4

Claims (1)

[Claims] The plurality of heat sources 2 and 3 provided in the fixing device A are turned on by the power switch I.
4 are turned on at the same time, and after heating the redundant device A to the preset fixing temperature T1, each heat source 2 and 3 is turned off. From then on, the single heat source 2 is controlled to blink to keep the fixing temperature T constant. A fixing temperature control method for an electronic copying machine, characterized in that the fixing temperature is maintained at .