JPS6015180A - Printer - Google Patents

Abstract

PURPOSE:To eliminate troubles such as mistaken page without adversely affecting a recording paper by forming a monitor mark for page managing information in areas other than the printing area of a photosensitive body to manage the printing based on the mark detecting it. CONSTITUTION:In a laser printer which irradiates a laser beam on a photosensitive drum 1 with a laser optical system 2 corresponding to image information based on the contents of a manuscript, an optical system 3 is added thereto and irradiates a bar code C for managing page areas other than the printing area of the photosensitive drum 1 to form a latent image. After the development of the image with a toner, the image C is detected with a detection means 4 (comprising a light source 15 and a photosensor 16) to manage pages. The additional optical system 3 can be made up of a transmission type liquid crystal module 11 for forming bar codes C, a control circuit 12 and a light source 13.

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 a mechanism in which the presence or absence of paper passing is always detected at a predetermined timing, and abnormality information is detected only when paper does not pass at the normal timing.
Even if the paper that is supposed to be printed on is delivered blank, there is an error.
It was impossible to detect any information.

Furthermore, when double-sided printing is performed, it is impossible to detect whether the pages are legal or not.

In order to eliminate the above-mentioned drawbacks, a method has been proposed in which a predetermined code is printed on the carrier strip portion of the paper and the code is detected to determine 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. Process bZ
This resulted in an addition to one printing process, which was inconvenient in any case.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to detect whether 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 printing 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 has a laser optical system that emits a laser beam according to image information based on a photosensitive drum 1 and a document inner trap, and forms a laser beam on the photosensitive drum 1. 2 and page management barcode C
an additional optical system 3 for forming the image on the photosensitive drum 1; a transfer system (not shown) for developing and deepening the image formed on the photosensitive drum 1 and transferring it to recording paper; and a transfer system (not shown) for page management. It is comprised of a detection means 4 for reading a bar code C on a photosensitive drum.

The photosensitive drum 1 is driven to rotate, and the photosensitive member attached to the surface receives light irradiation, and +t! A mechanism for forming a latent image based on ii information is being developed.

The laser optical system 2 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, and a lens system 8.9.
and a rotating polygon mirror 10, and is configured to form an image on the photosensitive drum l 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 code (-code C) in a non-print area located between the print areas on the photoconductor, and a control for controlling this. It is composed of a circuit 12 and a light source 13.

Furthermore, a transfer system consisting of a developing section, a transfer section, a fixing section, a cleaning section, etc. (not shown) is arranged 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 as shown in FIG. A light source 15 blinks at a predetermined timing so as to be turned on, a photosensor 16 for detecting the light reflected by the barcode, and a processing path (not shown) for processing the output of this photosensor. When there is a toner image on the photoreceptor, the light from the light source 15 is reflected and detected by the photosensor 16, and when there is no toner image, the light from the light source 15 is reflected. Absorbed and not reflected.

This fact is utilized to read the barcode using the photosensor.

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 transmitted to a rotating polygon mirror 1 which is rotationally driven.
0, the photoconductor on the rotating photoconductor drum l is scanned,
A latent image is formed on the printing area.

Next, the light source 13 that illuminates the transmissive liquid crystal module 11 displaying the 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 n.

As the photosensitive drum rotates 10 times, the exposed photosensitive member is sequentially developed in a developing section, and a printed toner image 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 print toner image generated on the print area is transferred onto the recording paper at the transfer section.

In this way, recording progresses,
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 that correct page management can be performed without leaving any disturbing information on the recording paper.

In the embodiment, a barcode carrying page management information was used, but for further simplification, instead of this, a simple mark was used, and it was assumed that 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〕

(7) As explained above, according to the printer of the present invention, the K1 monitor mark is formed on the photoreceptor in the non-printing area (area that is not transferred to the recording paper), and by detecting this, It is possible to detect whether an image is being formed correctly without affecting the recording paper in any way.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a laser printer according to an embodiment of the present invention;
FIG. 2 is a schematic explanatory diagram for explaining the detection means of the laser printer shown in FIG. 1 in association with the bar code on the photosensitive drum. 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... Transmissive liquid crystal module, 12... Control circuit, 13... Light source,
15... Light source pole 16... Photo sensor, a... Photoconductor, b... Print area, n... Non-print area, C...
・Page management barcode (8) r, Ji'...day'' Surr 1 station.

Claims (2)

[Claims] (1) It is characterized by comprising a monitor mark forming means for forming a predetermined monitor mark in an area other than the printing area on the photoreceptor, and a detection means for detecting the monitor mark on the photoreceptor. A printer that does. (2) The monitor mark carries page management information, and 1 the detection means is provided with a page management information reading means.Feature #4FIii1
A printer according to scope of request (1).