JPS61186976A - Electrostatic recording device - Google Patents

Abstract

PURPOSE:To execute a stable electrostatic recording work, and to raise the reliability for securing a driving operation, a maintenance, an electrostatic recording quantity and a recording sheet number efficiency, by varying a recording sheet number speed in accordance with a fixing roller temperature. CONSTITUTION:In an electrostatic recording device provided with a heat roller type fixing device, a recording sheet number speed is varied in accordance with a fixing roller temperature. That is to say, a setting range of a fixing roller surface temperature is set to 170-200 deg.C, the fixing roller surface temperature is detected by a heat sensible element such as a thermocouple, a thermistor, etc., its information data is transferred to a CPU contained in the electrostatic recording device, and a recording sheet number speed is determined each time by determining a speed of a driving system such as a photosensitive drum 1, a developing device 3, a fixing device 6, an optical device 7, a feed paper device 8, etc., by the CPU, so that a correct fixation is also obtained. Also, a temperature of the fixing roller is detected, and a recording sheet number speed is varied in accordance with its temperature so that the fixing roller surface temperature does not fall below a fixation available temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improving the fusing quality of an electrostatic recording device having a heated roller fusing device.

(Prior art) In a general electrostatic recording device, 5 ICs are used as shown in Figure 3.
The latent image charged and exposed on the photoreceptor 1 becomes a visible image as toner is adhered to it by the developing device 3, and is transferred to transfer paper fed one by one from the paper feeder 8 by the transfer separation device 41C. The transfer paper separated from the photoreceptor 1 is fixed by passing through a heat roller type fixing device 6 and collected. Since electrostatic recording devices use power sources in offices and households and are widely used, the power that can be obtained from the power source is limited to 1.5 KW or less.

Therefore, the electric power that can be used for the heater as a heat source of the fixing device is also kept low, and therefore the heat capacity of the fixing device is small. Therefore, as shown in Figure 2, if a high-speed electrostatic recording device performs continuous electrostatic recording at a constant recording speed,
Since the surface of the fixing p-lar is deprived of heat by the thermal fixing transfer paper, the temperature decreases even further with no time to recover the heat, and the temperature drops below the set temperature range for fixing, resulting in a fixing failure trap. Therefore, when the fixable temperature falls below the lower limit, the main unit stops operating, waits for the temperature of the fixing roller to recover to the upper limit of the set temperature, and then restarts.

(Problems to be Solved by the Invention) As mentioned above, since the main body operation stops during continuous electrostatic recording at a constant recording number speed, the recording number efficiency decreases, and
Not only does this cause a great sense of anxiety to the user, but some users may mistakenly assume that the main unit is malfunctioning and perform processing assuming paper jams, insufficient toner density, abnormal charging voltage, abnormal exposure, etc.
This may disturb each setting condition and cause malfunction.

The present invention aims to solve these problems.

(Means for solving the problem) This problem is solved in an electrostatic recording device equipped with a heat roller type fixing device, which is characterized by changing the number of sheets recorded according to the temperature of the fixing roller. This solves the problem of the main body stopping in the middle of continuous electrostatic recording.

(Embodiments and Effects) The fixing p--color surface temperature that can be fixed at a practical use speed, paper thickness, and paper size is 170°C to 220°C. Further, the relationship between the continuous recording speed and the surface temperature of the fixing roller for proper fixing is approximately K as follows.

Based on such data, the fixing surface temperature is set in a range of 170 to 200°C, and the surface temperature of the fixing roller is detected by a heat-sensitive element such as a thermocouple or thermistor, and the information cheater is detected by an electrostatic recording device. Built-in CPU
The cPU transfers the photoreceptor drum 1, current device 3,
Determine the speed of the drive system such as the fixing device 6, optical device 7, paper feed device 8, etc., and determine the recording sheet number speed (number of sheets 7 minutes) each time,
This is to ensure that proper fixation is always obtained. Considering that the thing that has the most influence on the temperature drop on the surface of the fixing roller is the recording sheet speed (per minute), the temperature of the fixing roller is detected and the recording sheet speed is changed accordingly. This prevents the fixing p--color surface temperature from dropping below the fixable temperature, making it possible to perform continuous electrostatic recording with stable fixing quality.

The above relationship becomes 5&C as shown in the diagram shown in FIG.

That is, when continuous electrostatic recording is started at a recording speed of 40 sheets/min, the fixing p--color surface temperature, which was 200 DEG C., becomes 185 DEG C. at time tl. Therefore, if the recording speed is changed to 38 sheets/min at this point, continuous electrostatic recording is continued until the temperature reaches 175° C. at time t2. When the temperature reaches 175° C. at time t2, the recording speed is changed to 36 sheets/min, and continuous electrostatic recording can be continued indefinitely until the end. Also, when you finish continuous electrostatic recording and start continuous electrostatic recording again,
The surface temperature of the fixing roller is recovered to an arbitrary temperature between 170 and 200[deg.] C. depending on the recovery time, and the temperature is controlled to start from the recovered temperature and follow the process line described above.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims.

For example, the photosensitive drum 1, the optical device 7, and the developing device 3 described above.
, only the speed of the fixing device 6 may be changed in response to the temperature of the fixing device without changing the speed of the paper feed device 8, that is, without changing the speeds of the various process devices at the stage before the fixing device.

In addition, in the above embodiment, the temperature of the fixing roller is detected,
The recording speed is controlled based on this information.
As shown in Figures 1 and 2, the relationship between the continuous electrostatic recording time and the surface temperature of the fixing roller when the number of recording sheets is kept constant, and the relationship between the surface temperature of the fixing roller and the continuous electrostatic device time and the number of recording sheets. Since the relationship between CP and
It is also possible to have a built-in program in the U that determines each continuous electrostatic recording time and the appropriate recording sheet number speed according to the temperature between the pages of the fixing p-ra front, and to change the recording sheet number speed according to this program ◇ Therefore By controlling according to the method of the present invention, the surface temperature of the fixing roller can always be maintained at a temperature that allows fixing.

(Effects of the Invention) According to the present invention, continuous electrostatic recording in an electrostatic recording device can perform stable electrostatic recording work while controlling the number of recording sheets without stopping the mechanical device midway. 5. Good effects can be obtained such as increased reliability in terms of operation, maintenance, electrostatic recording work, and ensuring efficiency in the number of sheets arranged.

[Brief explanation of drawings]

FIG. 1 is a recording sheet number speed control diagram for always keeping the fixing roller surface temperature within the fixable temperature range. FIG. 2 shows a drop diagram of the surface temperature of the fixing roller and a recovery line of the stop layer when the number of recording sheets is kept constant. Figure M3 is a schematic diagram of a general electrostatic recording device. 1... Photoreceptor drum 3... Existing equipment 5...
・・Transfer separation device

Claims (1)

[Claims] In an electrostatic recording device equipped with a hot roller type fixing device,
An electrostatic recording device characterized by changing the recording speed according to the temperature of the fixing roller.