JPH05225B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printer, and particularly to a printer equipped with a page management function.

[Prior art]

Conventionally, page management in a printer has been performed by a detection means disposed in a paper ejection path. This is always done at a predetermined timing.
The system detects whether paper passes or not, and detects "abnormal" information only if the paper does not pass at the correct timing, so even if paper that is supposed to be printed on is ejected blank, it will not be detected. , it was impossible to detect "abnormal" information. Furthermore, when double-sided printing is performed, it is impossible to detect whether the pages are in the correct order.

In order to eliminate the above-mentioned drawbacks, a method has been considered in which a predetermined code is printed on the carrier stop portion of the paper, and by detecting this code, it is possible to detect whether or not printing is being performed normally. . However, in this case, other than the contents of the original will be printed, so there is a problem with the marketability of the paper on which it is recorded. This resulted in a step being added to the printing process, which was inconvenient in any case.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and
The purpose is to detect whether or not an image is being formed correctly without affecting the recorded paper in any way.

Another object of the present invention is to detect whether images are formed in regular page order.

[Structure of the invention]

The printer of the present invention is equipped with means for forming a monitor mark on a portion of the photoreceptor other than the print area, and a detection means for detecting the monitor mark on the photoreceptor, thereby making it possible to form an image. It is possible to detect whether or not printing is done correctly only on the photoreceptor, and it is possible to check whether printing is correct or not without having any effect on the paper after printing.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Laser printers according to embodiments of the present invention will be described below with reference to the drawings.

As schematically shown in FIG. 1, the laser printer according to the embodiment of the present invention emits a laser beam according to image information based on the photosensitive drum 1 and the content of the original.
A laser optical system 2 that forms an image on the photosensitive drum 1
and an additional optical system 3 for forming a page management barcode c on the photosensitive drum, and a transfer system (not shown) for developing the image formed on the photosensitive drum 1 and transferring it to recording paper. and a detection means 4 for reading the page management barcode c on the photosensitive drum.

The photosensitive drum 1 is driven to rotate, and a photosensitive member attached to the surface is irradiated with light to form a latent image based on image information.

The laser optical system 2 also includes a laser light source 5, a modulator 6 for modulating the laser light emitted from the laser light source according to image information, a slit 7, lens systems 8 and 9, and a rotating polygon mirror 10. It is configured to form an image on the photosensitive drum 1 based on the contents of the document.

Furthermore, the additional optical system 3 includes a transmissive liquid crystal module 11 that forms a page management barcode c in a non-printing area located between printing areas on the photoreceptor, a control circuit 12 for controlling this module, and a light source. It is composed of 13.

Furthermore, a transfer system including a developing section, a transfer section, a fixing section, a cleaning section, etc. (not shown) is disposed around the outer periphery of the photosensitive drum 1, so that printing can be performed on a predetermined sheet of paper.

In addition, a detection means 4 is disposed between the developing section and the transfer section, and is turned on when the non-printing area n carrying the barcode c approaches this detection means, as shown in FIG. a light source 15 that blinks at a predetermined timing; a photo sensor 16 for detecting light reflected by the barcode;
It is comprised of a processing circuit (not shown) for processing the output of this photo sensor. When a toner image is present on the photoreceptor, the light from the light source 15 is reflected and detected by the photo sensor 16, and when no toner image is present, the light from the light source 15 is absorbed and not reflected. This fact is utilized to read the barcode using the photo sensor.

Next, a printing method using this device will be explained.

FIG. 2 is a schematic explanatory diagram showing the relationship between the detection means 4 and the barcode c on the photosensitive drum 1.

A laser beam emitted from a laser light source 5 and modulated in accordance with image information based on the content of the document by an optical modulator 6 made of an acousto-optic element is directed onto the rotating photosensitive drum 1 by a rotating polygon mirror 10 that is rotationally driven. The photoreceptor is scanned to form a latent image on the printing area b.

Next, the light source 13 for illuminating the transmissive liquid crystal module 11 that displays page management information is turned on, and a latent image of the page management barcode is formed on the non-print area n adjacent to the print area b.

As the photosensitive drum 1 rotates, the exposed photosensitive member is sequentially developed in a developing section, and a printed toner image h and a barcode c are generated.

Then, this barcode c is read by the detection means 4, and through a predetermined calculation in the processing circuit, page management information is displayed.

Further, the printed toner image generated on the printing area b is transferred onto the recording paper at the transfer section.

In this way, recording proceeds. Since the barcode c is formed on the non-printing area n, it does not stain the recording paper and is removed from the photosensitive drum by the cleaning section. .

In this way, the page management information is processed on the photoreceptor without being printed on the recording paper, so there is no disturbing information left on the recording paper.
Able to perform proper page management.

In the embodiment, a parcode carrying page management information was used, but for further simplification, a simple mark was used instead, and this mark was formed on the photosensitive drum. By detecting whether or not printing is being performed correctly, it is also possible to manage whether or not printing is being performed correctly.

〔Effect of the invention〕

As explained above, according to the printer of the present invention, a monitor mark is formed in the non-printing area (area where no transfer is made to the recording paper) on the photoreceptor, and by detecting this, the monitor mark is It is possible to detect whether the image is being formed correctly without any influence on the image.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a laser printer according to an embodiment of the present invention, and FIG. 2 is a schematic explanatory diagram for explaining the correspondence between the detection means of the laser printer shown in FIG. 1 and the barcode on the photosensitive drum. be. 1...Photosensitive drum, 2...Laser optical system, 3
...Additional optical system, 4...Detection means, 5...Laser light source, 6...Modulator, 7...Slit, 8,9
... Lens system, 10 ... Rotating polygon mirror, 11 ... Transmission type liquid crystal module, 12 ... Control circuit, 13 ...
...Light source, 15...Light source, 16...Photo sensor,
a... Photoreceptor, b... Print area, n... Non-print area, c... Bar code for page management, h... Print toner image.

Claims (1)

[Claims] 1. Monitor mark forming means for forming a predetermined monitor mark in an area other than the printing area on the photoreceptor, and detection means for detecting the monitor mark on the photoreceptor. A printer characterized by: 2. The printer according to claim 1, wherein the monitor mark carries page management information, and the detection means includes page management information reading means.