JPS59223071A - Printer - Google Patents

Abstract

PURPOSE:To eliminate the necessity for mass memory with a printer and to simplify the constitution of the control circuit of the printer, by separating a reader section from a printer section and sending a video signal from the reader section in synchronization with a timing signal from the printer section. CONSTITUTION:A printer section B drives a timing roller 18 in synchronization with a VSYNC signal sent from a reader section A and the reader section A starts sending of a video signal synchronously to the VSYNC signal. A BD signal is a signal generated by the printer section B and a digital signal image is sent from the reader section A in synchronization with this BD signal. The reader section a transmits the digital signal image to the printer section B by synchronizing the signal with a section where an OVE signal is active in the main scanning direction. At the printer section B, for example, an one-shot multivibrator is triggered by means of the rise of the VSYNC signal and the drive signal RG of the timing roller 18 is generated. The video signal is outputted to the printer section B in a section where a VE signal is active.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to registration adjustment for a printer that records electrical signal information without using a large capacity memory.

Conventionally, in printers that record electrical signal information, image formation is performed after the electrical signal information is once stored in a large-capacity memory within the printer. Therefore, when forming an image on print paper, it is sufficient to time the reading of the electrical signal information stored in the memory.

However, if the printer has a high recording density and a high recording speed, the price of such memory becomes very high.

Therefore, printers that do not use such large-capacity memory have been developed. There are disadvantages in that it becomes difficult to register the electrical signal information formed in the image and the print paper, and the timing signal provided from outside the printer becomes complicated.

SUMMARY OF THE INVENTION In view of the above drawbacks, it is an object of the present invention to provide a registration adjustment method for a printer that does not use a large-capacity memory and can record using a simple external timing signal.

Hereinafter, the present invention will be explained in detail based on examples.

FIG. 1 is an example of an internal configuration diagram of a digital copying machine to which the present invention is applied.

This example has a separate configuration into a league section indicated by A and a printer section indicated by B. In league and division,
It reads the original, converts it into an electrical signal, and sends it to the printer as a digital signal. The printer section converts the received digital signal into an optical signal using a semiconductor laser, and forms an image on plain paper using an electrophotographic process.

By separating the league section and printer section in this way, the system can be made more flexible by allowing the printer section to be used as a word processor, computer terminal, etc., or the league section to be used as a high-speed facsimile machine. It has the characteristic that it comes out.

First, I will start by explaining League Division A.

A document to be read is placed face down under a document table cover 4, illuminated by a fluorescent light 2, and scanned by an optical system drive motor (not shown). The read original image is converted into an electric signal by a CCD 1 via a reflection mirror 2.5 and an optical lens 6. The converted electrical signal is subjected to digital signal processing and sent to printer section B.

In printer section B, the receiver receives the received digital signal,
The laser beam is directly converted into an optical signal by a laser scanner Φ unit 25 using a semiconductor laser and a polygon mirror, and the laser beam is scanned in parallel to the photoreceptor drum 8.

The laser light is irradiated onto the photosensitive drum 8 via the reflecting mirror 24 and the secondary charger 12. The area around the photosensitive drum 8 is composed of parts for the NP process. Pre-static eliminator 9, pre-exposure lamp 10, negative charger, full-surface exposure lamp 13, developer 14, transfer charger 19, separation roller 2
It is 0 etc.

The original image formed by the NP process is transferred to print paper, passes through a conveyor belt 21 and a fixing device 22, and is output to a tray 23.

The print paper stored in the paper feed force center 15 is moved along the paper feed kite 17 by the paper feed roller 16, reaches the timing roller 18, is bent by about 20 mm, and then stops. The print paper is driven so as to be perfectly aligned with the original image formed on the photosensitive drum 81-.

In this embodiment, since the printer section B does not have a large capacity image storage memory, the timing roller 18
The drive timing must be generated in some way.

When printer section B has a large-capacity image storage memory, the digital signal image of the manuscript sent from league section A is stored in the image storage memory, and printer section B Since the reading timing of the signal image can be set freely, it is extremely easy to match the registration of the original image formed on the print paper and the photosensitive drum 8. If the printer section B does not have a large capacity image storage memory as in this embodiment,
Such timing must be provided in the league part A, which has disadvantages in that the number of control signal lines increases and control becomes complicated.

FIG. 2 is a diagram showing the connection of digital image signals between the league section A and the printer section B.

The BD double signal is a signal sent from the printer section B to the league section A, which indicates the timing of the laser beam scanned by the laser φ scanner φ unit 25, and the league section A receives the digital electrical signal read in synchronization with this signal. The image is output to printer section B as a VIDEO signal. VSY
The NC signal is a signal indicating the beginning of the VIDEO signal.

FIG. 3 is an explanatory diagram showing the concept of the present invention.

In the printer section B, the scanned laser light is emitted by j% to a point X on the photosensitive drum 8 through the secondary charger 12. By driving the timing roller 18, the print sheet that has been stopped at a point Y on the timing roller 18 comes into contact with the imaged original image at a point Z on the photosensitive drum.

Time A is the time it takes for the original image formed at point X to reach point Z, and time B is the time it takes for the printing paper to reach point Z after it is conveyed from point Y. By setting time A=time B, printer section B only needs to drive timing roller 18 in synchronization with the VSYNC signal sent from league section A. League Division A is V
Since it is sufficient to start sending out the V I DEO signal in synchronization with the SYNC signal, there is an advantage that the control circuit can be simplified.

A more detailed explanation will be given using the timing chart in FIG. 4 and the example of the timing generation circuit of league division A in FIG. 5.

In FIG. 4, a digital signal image is sent from league section A in synchronization with the BD double signal, a signal generated by printer section B. The OVE signal is a signal that is active while the raw time passes inside the league section A in synchronization with the BD double signal and the laser beam scans the increasing portion on the photosensitive drum 8 of the printer section B. be. Therefore, the league unit A only has to synchronize the digital signal image in the main scanning direction in the section where the OVE signal is active and transmit it to the printer unit B.

The IE double signal is a signal generated within the league section A, and is a control signal for outputting a digital signal image to the printer section B during the active section of the signal. This IE multiplied signal, for example, can be obtained by sesorting the SR flip-flop with a sensor attached to the reading tip position of the document placed on the document table in league section A, and resetting it with a sensor attached to the inverted position of the optical system. can get. vSYN
The C signal becomes active during the 10vE signal period after the IE double signal rises.

At the rise of the VSYNC signal, the printer section B generates a drive signal RG for the timing roller 18 by, for example, triggering a one-shot command multi-order vibrator. It is sufficient to keep the RG double signal active and TIG while the print paper passes.

The V E Hi signal is the OV signal in the active period of the IE double signal.
This is the E signal. VE double signal active section VIDE
It is sufficient to output the O signal to the printer section B.

FIG. 5 shows a specific example of a circuit for generating these signals. From the OVE signal and the IE multiplication signal, the VE multiplication signal VSYNC signal is sent to the D type free, red flop 10.
Synchronized and generated by 2.104. As you can see from the diagram, it has a very simple circuit configuration.

In this embodiment, a so-called laser beam printer has been described, but it is clear that the present invention is also applicable to similar printers using OFT or the like.

As described above, according to the present invention, it is possible to realize a registration adjustment method for a printer that can record using a simple external timing signal without using a large-capacity memory, and to simplify the configuration of the control circuit. can reduce the cost of equipment,
This makes it possible to reduce

[Brief explanation of the drawing]

Figure 1 is an internal configuration diagram of a system to which the present invention is applied, Figure 2 is a diagram showing the connection of electrical signal information between the league and the printer, Figure 3 is a diagram showing the basic idea of the present invention, and Figure MS4 is a diagram showing the connection of electrical signal information between the league and printer. 5 is a timing chart diagram, FIG. 5 is a timing generation circuit diagram, and 18 is a timing roller. Applicant: Canon Co., Ltd. Procedural amendment (method) Director of the Patent Office Kazuo Wakasugi 1, Indication of the case 1982 Patent application No. 97174 2
Name of the invention Printer 3 Relationship with the case of the person making the amendment Patent applicant's office 3-30-2 Shimomaruko, Ota-ku, Tokyo August 60, 1982 (Delivery date) 6. Drawings subject to the amendment Engraving of content drawings (no changes to content)

Claims (1)

[Scope of Claims] The receiver has an image forming means for forming an image of the received electrical signal information on recording paper, and a timing roller that temporarily stops the recording paper and feeds the recording paper in accordance with the recorded image by the image forming means. In the printer, the time A required for the leading edge of the image formed by the image forming means to reach the leading edge of the recording paper, and the time A required for the leading edge of the image formed by the image forming means to reach the leading edge of the recording paper, and the time A from when the recording paper, which is once stopped by the timing roller, is fed until the above-mentioned image changes. The electric signal information is registered with the recording paper by setting the time B until the electric signal reaches the same and moving the timing roller in synchronization with the start of image formation based on the electric signal information. printer.