JPS58120284A - Temperature controlling method of printer - Google Patents

Abstract

PURPOSE:To eliminate the maintenance work for faults other than inherent machine faults, by providing a low temperature detecting circuit, which detects the lower temperature limit determined on a basis of the limit of fixation ability, in either one of a preheating plate or a heat roll. CONSTITUTION:Low temperature detecting circuits are provided in a preheating plate 9 and a heat roller 10. A resistance value B2 of a thermistor 11 arranged near the heating body of the preheating plate 9 is changed in accordance with the temperature of the preheating plate 9, and the voltage applied to the thermistor 11 and a reference potential E1 of a comparator are compared with each other to output a temperature control signal. By this constitution, even if the low temperature detecting circuit of the preheating plate or the heat roll is operated temporarily by using a form having a high humidity or a temporary lowering of the input power, the printability is restored after the elapse of a prescribed time; and thus, the maintenance work for troubles due to user circumstances is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved method for controlling the temperature of a fixing device in a printer that employs the Fi electronic back type printer.

Ya-1Lsltf'! See a schematic diagram C of a printer that eliminates the child photo power formula. The surface of the photosensitive totom 1 is uniformly charged by the charger 2. The laser light from the laser oscillator is converted into a dot-shaped light by 7% according to the printing data through the laser oscillator 4, and is then converted into a dot-shaped light by the rotary polygon 5. The exposed image of the 0° photosensitive tram 1 is scanned onto the surface of the 0° photosensitive tram 1 to form an exposed image of print data. The toner image is transferred to #130.

Printing paper 1 with toner-marked f111 data on it
3 is preheated by the base 9, and is heated and suppressed by the heat roller 10 and the pressure roller 11, thereby fixing the print data to the stamp 1 paper. After about 10 minutes of transfer, some residual material 1. was not transferred to the printing paper 13 and was left on the surface of the photosensitive drum 1. In the conventional printer of this building, the toner is cleaned by the cleaning brush 12 and then transferred to the charging process again.
When the printing paper 1 contained a large amount of moisture, the m degree of the preheating plate 9 and the heat roller 10 decreased significantly, resulting in development in which the toner was not sufficiently fixed on the printing #t13, so-called fixation failure.

Alternatively, if a circuit for detecting the fixing limit temperature is added to the preheating plate 9 and the heat roller 10, the printer stops due to temperature abnormality.

In either method, there is a problem in that even if the user is clumsy in storing the paper, it will be clearly distinguished from the machine 1 runal and maintenance will be required.

The purpose of the present invention is to remove the preheating plate and heat roller when the temperature of the preheating plate or the heat roller does not reach the lower limit temperature due to the humidity of the EIJ paulownia paper or a temporary drop in the input source, and there is a risk of poor adhesion. Predetermined temperature w rc lP! The printing operation is stopped until J6 is reached, and a temporary standby state is maintained until the predetermined temperature KL!
-! Automatically allows continued use after a short time when I meet VC-
By doing this, maintenance dispatch outside of a true 7-single failure PJ is eliminated.

The present invention focuses on the fact that if the preheating *- or heat roller truly malfunctions, it will not work even after a predetermined period of time. Since it becomes easier to isolate the temperature drop of the heat roller,
In addition to the temperature control circuit, the preheating plate and heat roller are equipped with electrodeposition @
A circuit is installed to detect the FM temperature limit (determined from the temperature value), and if the bottom corner temperature temporarily reaches the lower corner temperature due to paper humidity or power fluctuations, the printer is controlled so that the printing operation is put into a temporary standby state. J husband to.

Wrinkle 21m1ti shows a block diagram of the OA degree 111III control circuit of the preheating &9 and Th roller 10 used in the present invention,
- Figure 6 shows an example of printer control according to the prior art at all times outside the temperature range, and Figure 4 shows the preheating plate trap tj heat according to the present invention.
- An example of how to control a printer in the event of an abnormality is provided.

As shown in Fig. 6, two misters 11 are placed near the heating element of the preheating plate 9, or a thermistor 11 is placed depending on the height of the preheating plate 9.
By changing the resistance aBt of i!, a force of 1 is applied to the thermistor 11. The I pressure and the group 4mL positions E and J of Konno; Shi - Tano are compared and become a temperature control body. Comparator A15 temperature control signal set, preheating plate control circuit 1
is applied to control the temperature of the preheating plate 9. cormorant. is a human power source. When the temperature of the preheating plate 9 is abnormally low 17 and the voltage H- applied to the thermistor 11 exceeds the reference voltage E, λt (when the temperature of the preheating plate 9 is determined by the electrodeposition of the eyelid), @Detect the temperature. The 1st limit filling signal of the preheating plate is referred to as P) 11, ○i# TEMP.

Using a heat-sensitive ferrite placed close to the heat roller 91 [), the signal r from the buzz sensor 18 is processed by the temperature control circuit 19 to control the heat roller energization control circuit 20 to control the consistency of the loaf 10. Conduct city control. The heat roller low temperature #detection path 21 is set to 1 when the energization signal applied to the control circuit zO from the temperature control circuit 19 to the heat roller path exceeds a predetermined time.
1 Recognizes that the heat roller is at a low temperature"t HRLOW
T, E) JP double signal is established.

In a printer equipped with a preheating plate and a heat control circuit and a low-temperature Yokota circuit, for example, when the preheating plate 9 detects a low temperature when it is equipped with an eyepiece that has traditionally been said to generate a lot of moisture. At that time, the PHLOW TEklP name was established and 1
The printer reports that there is an abnormal condition of 11hK, and indicates that the printer is ready for operation.PRIADY (No. 8 is not established.In this case, it is a temperature failure, so it is impossible for the operator to perform a coma.) 3. Therefore, in the present invention, even if paper containing a lot of moisture is loaded as shown in -F, or when the input power is temporarily reduced, the heat roller 1 When detecting low temperature of Part 1: Stop operation FRLN'I'i.
Within a certain period of time, the preheating plate 9 and the heat roller 10 reach the specified temperature (
When it wanders once at a time (the L setting at four constant #rA degrees is realized by the hysteresis /s of the comparator 16) (
- PA LJS 14; Reset the signal - C1P
Automatically establish RREADY Hakugo-C, E4j
To 11 action (establishing Pl'1INr) Article: 11i+ to continue! control (4th R1) If the low-temperature layer build-up is not released even after a certain period of time has passed, it is likely that a failure has occurred in the equipment and the warm clothing control is no longer possible. PRR only as a trouble if! Leave A l'l Y untrue.

In Part 2 and 1, preheating cram school! Although the angular force of the roller 11) is equipped with a low-temperature detection circuit, the same effect can be obtained by simply biasing it to one side. .

According to the present invention, it is possible to temporarily use the preheating plate or the
Is it enough time even if the low temperature detection circuit of ao--ra is activated?
Jf& is reprinted to ffrfi, eliminating maintenance dispatch due to troubles such as those mentioned above.

[Brief explanation of drawings]

:r] @ is a schematic diagram of a printer using the photocopying force type in '1, and figure 2 is the temperature control 1f of the preheating coffin heating roller? 1 route diagram, -13 is a conventional preheating plate or an example of printer control when the temperature of the heat roller system is abnormal. Or i
jMIJ- is a time chart showing a sub-example of printer control when the temperature of the yarn is abnormal. 1 is a photosensitive drum, 2 is a charger, 3 is a tit laser emitter, 4 is a modulator, 51 rotations are rotated, 6 is an imager, 7 is a paper feed mechanism, 8 is a transfer device, 9 Cloud 1 preheat pno,
10 is a heat roller, 11 is a pressure roller, 12 is an extinguishing roller, 16t, [Introduction for printing, 14 is a thermistor, i5H conductor x-, 16i = non-palator ■5.17
d+heat root tracing control circuit, 18 is a temperature sensor, 19 is a temperature control circuit, 2 [lH heat roller passage control l! ,! l road,
21 is koi roller tatagata test d1 do 1 road. Name of patentee: EI VI Iso Co., Ltd.';
l-11D age 3 figure available '4 figure 1? Law Ding EI'IP

Claims (1)

[Claims] In an electrophotographic printer that uses the initial heat fixing method,
A low temperature detection circuit for detecting a lower limit temperature determined from the limit of fixing property is provided on at least one of the pre-M, plate and TL heat roller, and when the low temperature detection circuit is differentially operated, Temporarily cancel the printer's operational state to stop the printing operation, and then return the printer to the operational state when the preheating plate and heat [J-RA] are in normal operation. 1. A temperature PV control ITj method for a printer, characterized in that the temperature PV control ITj method is characterized in that the temperature PV control ITj is controlled so that the printing operation can be continued by making the temperature return to the temperature PV of the printer.