JPS6048654A - Picture output device - Google Patents

Abstract

PURPOSE:To discriminate properly the normality and abnormity of a picture by comparing a reading output code of a picture read by a picture reader provided near a paper discharge section with a print data code. CONSTITUTION:A print data Di from a page memory 40 is fed to a modulator 11 via a character generator 60, the modulator 11 modulates a laser light from a laser tube 12, a modulated output forms an electrostatic latent image on a photosensitive body 15 via a turnign mirror 13 and a reflecting mirror 14, and the image is outputted on an output paper sheet 20 via a printer process as a picture image. When the paper sheet 20 reaches a prescribed position of the paper discharge section 30, control signals (p), (q) are outputted from a read control circuit 42. A memory 40 receiving the signal (p) outputs a character code (v) to a comparator circuit 44. A code converting circuit 43 receiving the signal (q) drives a picture reader 31 to read a picture on the paper sheet 20, the code of read output is converted and a read output code (u) is outputted to the circuit 44. The circuit 44 compares the codes (v), (u) and when the both are coincident, it is discriminated as normal, and when dissident, a stop signal (a) is outputted to stop the print operation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image output device. Printers such as computers and word processors, and output devices such as facsimiles and e-mails may be operated unattended, so they are equipped with a self-check mechanism. When an abnormal situation occurs, processing appropriate to the abnormal situation is carried out.

However, the conventional processing method described above does not check the output image itself, but rather assumes that there is no problem in the output image if each unit that makes up the device δ operates without any trouble. Image quality may be extremely poor due to problems in manufacturing and storing transfer sheets, thermal paper, ink ribbons, ink sheets, etc.

In this case, depending on the device, the memory contents are cleared sequentially after printing the image, so it is possible to print again.
There is a problem that important data cannot be reproduced.

The present invention fundamentally changes the concept of conventional checking and attempts to determine whether an image is normal or abnormal by directly checking the image quality itself.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

The figure shows an example in which the present invention is applied to a laser printer, where 10 is a printer device. Page memory 4 (described later)
The coded print data D1 sent from 0 is input to the modulator 11 via the character generator 60, which modulates the laser light from the laser tube 12 appropriately, and the modulator 11 outputs a modulated output. . This modulated output is transmitted through a rotating mirror 13 and a reflecting mirror 14 to a drum-shaped photoreceptor 15.
An electrostatic latent image is formed thereon, and the image is imprinted so that a predetermined image output is obtained by the developing device 16, the transfer device 17, and the fixing device 18 on the output paper 20 that is gradually fed from the paper feed device 70. However, it is not as thick as a regular laser printer.

Reference numeral 30 denotes a paper discharge section from which the output paper 20 is discharged, and an image reading device 31 for detecting and reading the output image on the output paper 20 is provided near the discharge section. This image reading device 31
For example, CCD (Charge Couplea[)e
vice-charge coupled device). 32 is a light source, 33
is a lens, and 34 is a paper discharge tray.

A switching circuit 41 is provided on the input side of the page memory phrase, and signals such as encoded print data from the sending side S are input to the page memory 40 via this circuit 41. Then, the page memory 40 stores print data I.
Stores the truth in address order.

Reference numeral 42 denotes a reading control circuit controlled by, for example, a timing signal of the transport system, and the control signal p + qit is inputted to the page memory 40 and the code conversion circuit 43.

The code conversion circuit 43 drives the image reading device 31 based on the control signal q, converts the read output of the reading device 31 into a code, and outputs a read output code U. ■
is the character code read out from the page memory 40 based on the control (iN No. I).

44 is a comparison circuit to which the read code U and character code V are input. - 50 is another notch circuit or printer device.

Next, an explanation will be given of the operation when the print data I) is transferred from the sending side S. 3. The print data D is stored in the page memory 4() in the order of addresses. Then, from the page memory 40, print data Di
is sequentially transmitted to the modulator 31 via the character generator 00.
It is sent to the output paper 2 through the normal printer tab "I process".
The image is output as 7 on top of 0.

When this output paper 20 arrives at a predetermined position on the paper discharge section 30, a timing signal of the 1 broadcast system is manually inputted to the reading control circuit 42. As a result, the control signal p and q are outputted from the control circuit 42.

The page memory 40 that has received the control signal p compares the character code V, which is the start address of its internal memory, with the comparison circuit 4.
Output to 4.

On the other hand, in response to the control signal q, the code converter LMS 43 drives the image reading device 31 by 1 to read the output image on the output paper 20 located in the paper discharge section 30, and converts the read output into a code. and outputs the read output code U to the comparison circuit 44.

The comparison circuit 44 compares the character code ■ and the read output code 11, and determines whether or not they match.

Hereinafter, images for one page are processed in the same manner through determination 1.

As a result of the comparison, if there is a discrepancy or if the degree of discrepancy exceeds a certain tolerance value, a stop table ip & is executed to stop the printing operation and issue a warning. In addition, if it is not possible to stop the processing, a switching command is issued at the same time as the output is stopped, the switching circuit 41 is controlled to switch, and the other memory or printer 50 is operated. Store the data in a separate memory or output it on a separate printer, and
In parallel with these processes, a notification signal C is transmitted.
feed back to stop the transmission of signals such as print data, or (or cause them to be retransmitted).

As described in detail above, according to the present invention, the output image is read by the image reading device provided near the paper ejection section.
Since the code signal obtained based on the read output is compared with the code of the print data, it is possible to reliably check the image quality on the output paper. Unlike conventional checking methods, since the image itself is checked, it is possible to accurately determine whether the image quality is normal or abnormal.

Note that the present invention is applicable not only to nighttime or unmanned operation, but also to situations where there is a person near the device, when the output paper is sent to a printer, when the output paper is automatically engraved, or when the output paper is ejected face down. It goes without saying that a useful effect can be produced even when the angle is 1°).

[Brief explanation of the drawing]

10. Printer device, 20. Output paper, 30.
...Paper discharge unit, 31...Image reading device, Dl-...Print data, υ...Reading output code, ■...Character code, S...Sending side.

Claims (1)

[Claims] In an image output device that prints an image on output paper by a printer device based on coded print data transferred from the sending side, the image is printed by an image reading device installed near the paper ejection section. An image output device characterized in that the image output device reads a read output code obtained based on the read output and compares the read output code obtained based on the read output with the print data code.