JPS61148460A - Driving control system of laser printer - Google Patents

Abstract

PURPOSE:To obtain a print of good quality without any influence of temperature nor humidity when a device is restarted by preprinting an image on a photosensitive drum before the device enters steady operation, and then cleaning the drum and removing electrostatic charges. CONSTITUTION:When the device is started, a control part 4 reads data for preprinting out of a storage part 3 and transfers it to a laser driving part 5 and also drive laser light. At the same time, the control part 4 supplies an instruction to a drum driving part 7 and a rotation control part 9 rotates the photosensitive drum to record the data for preprinting on the drum through a write control part 8. Then, a cleaning brush driving part 10 removes electric charges. Print density, etc. on the other hand, is affected by a charging voltage, so the charging potential of the photosensitive drum is measured. Further, the storage part 3 is stored with a charging voltage enough to make an excellent print and this voltage is compared with the voltage of the photosensitive drum which is detected by a charging voltage detection part 6. When the result shows an excellent state, the device enters steady operation.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a drive control method for a laser printer, and in particular to a control method for stabilizing the characteristics of a photosensitive drum during initial printing when the device is powered on. .

[Conventional technology]

The photosensitive drum used in laser printer equipment is
Its characteristics are influenced by the external environment.

It is particularly susceptible to the effects of temperature and humidity in the external environment,
The printing characteristics are affected by the atmosphere in contact with the photosensitive drum. This is due to the fact that the surface potential of the photosensitive drum changes under the influence of temperature and humidity.

In such a case, the fixability and density of the print result will be affected.

This effect is particularly noticeable in the initial print quality when the apparatus is restarted after being stopped for a long time.

[Problem that the invention seeks to solve]

The present invention provides a method for restarting a laser printer device after it has stopped for a long time to improve the printing quality before entering normal operation.

[Failure to solve the problem]

In the present invention, before the apparatus enters normal operation, the photosensitive dome 5 is de-V pre-loaded and then immediately cleaned to remove the static charge and prepare for startup for regular printing. This is a so-called warming-up.

[Effect]

Before starting normal operation, charge the photosensitive drum in advance.
Cleaning removes the effects of temperature and humidity.

〔Example〕

FIG. 1 shows one of the features of the present invention! This is an example.

In this figure, 1 is a power supply, 2 is a print control section, 8 is a storage section, 4 is a control section, 5 is a laser drive section, and 6 is a band! tJE pressure detection section, 7 is a drum drive section, 8 is a write control section, 9 is a rotation control section, 10 is a cleaning brush drive section, and 11 is a display section.

Further, FIG. 2 is a flowchart when controlling the embodiment shown in FIG. 1.

Description will be given based on the embodiment of the present invention shown in FIG. 1 with reference to the flowchart shown in FIG.

After turning on the power source 1, the preprint shown in FIG. 2 is activated.

In this case, the control unit 4 detects that the power is turned on and starts the system. When activated, the control section 4 reads out the recording gate for preprint from the storage section 8, transfers it to the V-za drive section, and drives the V-za light.

At the same time, the control section 4 gives a command to the drum drive section 7, causes the rotation control section to rotate the photosensitive drum, and records preprint recording data on the photosensitive drum via the *S-inclusive control section 8.

After this, a latent image is formed on the photosensitive drum. This is performed by the write controller 8, but this step is not absolutely necessary. However, it is necessary when checking the quality of the latent image process.

Next, the charges accumulated by the cleaning brush drive unit lθ are removed. At this time, the photosensitive drum is rotated at least once.

On the other hand, print density and the like are affected by the charging voltage, so if the charging potential of the photosensitive drum is measured and does not reach a predetermined potential, printing will be defective. The band tw that detects this
This is the L pressure detection section 6. ``The storage section 8 stores a charging voltage sufficient for good printing, and this stored voltage is compared with the charging voltage of the photosensitive drum detected by the charging voltage detection section 6.

As a result of this comparison, if the charging voltage of the photosensitive drum has reached a predetermined value, the process shifts to the IT steady operation.

On the other hand, if the predetermined voltage is not reached even after the photosensitive drum is rotated a certain number of times, the control section 4 outputs a sear alarm output, and the display section 11 displays an after alarm.

This function makes it possible to check for defective prints in advance.

Incidentally, in the case of a laser printer device, grinding is required.

Normally, it takes about 80 seconds to 2 minutes after the power is turned on to perform general self-diagnosis of the control system.

If this time is used to perform the preprint operation according to the present invention, it will be an effective use of time.

Also, pre-print on photosensitive drums! It may be applied only to the parts that are easily affected by direct contact with the laser beam, and the area etc. may be made variable. [Effects of the Invention] According to the present invention, after the laser printer device has stopped for a long time, it can be applied again. When activated, good quality printing can be obtained from the start of regular printing operations without being affected by temperature or humidity.

[Brief explanation of drawings]

FIG. 1 is an embodiment of the present invention, and FIG. 2 is a flowchart for explaining the present invention. In the figure, 1 is a power supply, 2 is a print control unit, 8 is a storage unit,
4 is a control unit, 5 is a laser drive unit, 6 is a band tt pressure detection unit,
7 is a drum drive section, 8 is a write control section, 9 is a rotation control section, 10 is a cleaning brush drive section, and 11 is a display section.

Claims (2)

[Claims] (1) In a control method for a laser printer, after turning on the driving power, predetermined recording contents are recorded on a photosensitive drum that is exposed to light, and the photosensitive drum is rotated at least once to remove static electricity from the photosensitive drum. A laser printer drive control method characterized in that after cleaning, a steady printing operation begins. (2) comprising means for measuring the charged potential of the photosensitive drum;
The laser printer drive control according to claim 1, wherein an alarm is output when the charged potential to be measured does not reach a predetermined potential even when the number of rotations of the photosensitive drum reaches a predetermined number of times. method.