JPH052298A - Electrophotographic copying device - Google Patents

Abstract

PURPOSE:To quicken first printing by detecting the time that a polygon motor attains stationary rotation after it is started, and driving a paper carrying means by setting the time as reference. CONSTITUTION:A detection means 60 checks for a specified time (three seconds) whether the polygon motor 23 attains the stationary rotation when three seconds elapses after the respective component parts of an image forming means 10 are started. In order to check it, one part of the functions of a rotation detector 61 and a controller 50 which are connected to the motor 23 is used. A driving control means drives the paper carrying means 40 by setting the time detected by the means 60 as reference. When the means 60 detects that the motor 23 attains the stationary rotation, in such a case, the driving control means 50 starts printing by turning on the driving device 40 for carrying the paper under the condition that the specified time does not elapse.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an electrophotographic apparatus.

[0002]

2. Description of the Related Art FIG. 3 shows a schematic structure of a conventional electrophotographic apparatus. In the figure, 10 is an image forming means, which is usually a photosensitive drum 11, a charging device 15, an exposing section 21, a developing device 25, a transfer charging device 31, a discharging charger 35 and a discharging lamp 3.
6 is included. Here, the photosensitive drum 11 is rotated by the drive device 12 in the arrow direction. Further, the exposure unit 21 is configured to scan a laser beam emitted from a laser beam generator (not shown) with a polygon mirror 22 and a reflection mirror 24 which are constantly rotated by a polygon motor 23. The developing device 25 includes a developing sleeve 26 and a driving device 2 that rotates the sleeve 26.
It is configured to include 7.

Reference numeral 40 is a sheet conveying means. The paper carrying means 40 includes a paper carrying roller 41 and the roller 4.
And a drive device 42 for transporting the sheet, which is configured to rotate 1 to transport the sheet P from the sheet cassette 45 to the image forming unit 10.

Further, reference numeral 50 is a control device for driving and controlling the image forming means 10, the sheet conveying means 40 and the like. Further, 49 is a paper transport guide.

Here, in the above electrophotographic apparatus,
In the case of printing, as shown in the flowchart of FIG.
Etc. are turned on (step ST1). Then, after waiting for the set time of the polygon motor 23 to elapse, the sheet conveying driving device is turned on to start printing (ST2, ST3, ST4).

Here, the set time of the polygon motor 23 is a time preset as a time at which the polygon motor 23 always reaches steady rotation even under the worst conditions (low temperature, deterioration, etc.) (for example, 6 after start-up). Seconds).

[0007]

By the way, in the above-mentioned electrophotographic apparatus, since the set time of the polygon motor 23 is determined in consideration of the worst condition (low temperature, deterioration, etc.), the polygon motor 23 is good. Under various conditions (normal temperature, deterioration, etc.), even if the normal rotation has already been made before the set time, it is necessary to wait until the set time elapses before starting the driving of the sheet conveying means 40. It has the inconvenience that the eyes cannot be printed quickly (first printing).

In view of the above circumstances, an object of the present invention is to provide an electrophotographic apparatus capable of speeding up fast printing with a simple structure.

[0009]

SUMMARY OF THE INVENTION The present invention comprises an image forming unit having an exposure unit for rotating a polygon mirror by a polygon motor to perform optical scanning, and a sheet conveying unit for conveying a sheet to the image forming unit. The electrophotographic apparatus is provided with a detection means for detecting a time when the polygon motor reaches a steady rotation after being activated, and a drive control means for driving the sheet conveying means on the basis of the time detected by the detection means. Characterize.

[0010]

According to the present invention, the time when the polygon motor reaches steady rotation after being activated is detected by the detecting means. Then, the paper conveyance means is driven by the drive control means on the basis of the detected time.

As a result, the first print can be speeded up.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the electrophotographic apparatus according to this embodiment is configured to include an image forming unit 10, a sheet conveying unit 40, a control unit 50, a detection unit 60 which is a characteristic part of the present unit, and a drive control unit. .. The same components as those shown in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted or simplified.

Here, the detection means 60 is means for detecting the time when the polygon motor 23, which is a DC servo motor or the like, reaches steady rotation after being activated. In the present embodiment, the detection means 60 is formed so as to check whether the polygon motor 23 has reached a steady rotation for a predetermined time (3 seconds) after 3 seconds have elapsed since the respective components of the image forming means 10 were activated. The rotation detector 61 connected to the polygon motor 23 and a part of the functions of the control device 50 are used.

The drive control means is means for driving the sheet conveying means 40 on the basis of the time detected by the detecting means 60. In the present embodiment, the drive control means is configured by utilizing a partial function of the control device 50.

Next, the operation of this embodiment will be described with reference to the flow chart shown in FIG. To perform a printing operation using the electrophotographic apparatus, first, the charger 1 of the image forming unit 10 is used.
5, the polygon motor 23, the drive devices 12, 27, the static elimination lamp 36, etc. are turned on (step ST1).
0).

In this way, the rotation detector 61 of the detecting means 60 is turned on 3 seconds after each component of the image forming means 10 is activated, and whether the polygon motor 23 has reached a steady rotation for a predetermined time ( In this embodiment, it is checked for 3 seconds (steps ST12, ST14, ST1).
6).

The polygon motor 2 is detected by the detecting means 60.
When it is detected that 3 has reached the steady rotation, the drive control means (50) turns on (turns on) the sheet conveyance drive device 40 on condition that the predetermined time (3 seconds) has not elapsed in step ST16. ) To start printing (step S)
T20, ST22).

As a result, the first print can be speeded up. If it is not detected in step ST16 that the polygon motor 23 is in the steady rotation even after a predetermined time (3 seconds) has passed, an error process is performed (step ST18).

[0019]

According to the present invention, the detection means for detecting the time when the polygon motor reaches the steady rotation after the start-up, and the drive control means for driving the sheet conveying means on the basis of the time detected by the detection means are provided. Because it has a configuration equipped,
You can speed up the first print with a simple configuration.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a flow chart for explaining a startup operation of the same.

FIG. 3 is a diagram showing a schematic configuration of a conventional electrophotographic apparatus.

FIG. 4 is a flowchart for explaining a startup operation of a conventional electrophotographic apparatus.

[Explanation of symbols]

 10 Image Forming Means 21 Exposure Section 22 Polygon Mirror 23 Polygon Motor 40 Paper Conveying Means 50 Control Device (Drive Control Means) 60 Detecting Means

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location G03G 15/04 116 9122-2H

Claims (1)

Claim: What is claimed is: 1. An electrophotographic apparatus comprising: an image forming unit having an exposure unit that optically scans a polygon mirror by rotating the polygon mirror by a polygon motor; and a sheet conveying unit that conveys a sheet to the image forming unit. In the device, detection means for detecting the time when the polygon motor reaches steady rotation after starting,
An electrophotographic apparatus, comprising: a drive control unit that drives the sheet conveying unit based on the time detected by the detecting unit.