JPS59223065A - Printer - Google Patents

Abstract

PURPOSE:To make recording without using any bulk memory and by means of a simple timing signal from the outside, by adding dummy information of a prescribed time to the forefront of signal information and performing the regist matching of the signal information and a recording paper by moving a timing roller synchronously to the signal information. CONSTITUTION:A time required by an image formed at a point X for reaching another point Z is represented as A and another time required by a recording paper for reaching the point Z from the point Y of a timing roller 18 is represented as B. An OVE signal becomes active after a prescribed time has passed from the rise of a BD (scanning timing) signal and during a period when the effective part of a photosensitive drum is scanned by a laser light. An IE signal is generated in a reader section A and is a control signal for outputting a signal image to a printer section in the section where the signal is active. A VSYNC (roller driving timing) signal becomes active in an l-OVE signal section after the IE signal has risen. At the printer section, trigger is applied by means of the rise of the VSYNC signal and the drive signal RG of the roller 18 is generated. Therefore, the regist matching system of the printer which can record by means of a simple timing signal from the outside is made possible and the constitution of the control circuit is made simpler.

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 this electrical signal information is stored in a large capacity memory within the -H printer. Therefore, when forming an image on print paper, it is sufficient to time the readout of the electrical signal information stored in the memory.

However, if the printer's recording density and recording speed were high, the disadvantage was that the price of such memory would be very high. Therefore, it was necessary to develop a printer that did not use such a large capacity memory. has been done, but
When printing paper is mechanically fed and images are recorded indirectly on the printing paper, such as in electrophotography, it becomes difficult to align the electrical signal information formed in the image with the registration on the printing paper. The disadvantage is that the timing signal provided from the

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.

In this example, a league section indicated by A and a printer section indicated by B are separated. The league section 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. In this way, by separating the league section and printer section, the system becomes more flexible, such as using the printer section as a terminal for word processors, computers, etc., or using the league section as a high-speed facsimile machine. It has the feature 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 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 beam is irradiated onto the photosensitive drum 8 via the reflection mirror 24 and the secondary charger 12-.

The area around the photosensitive drum 8 is composed of parts for the NP process. These include a pre-static eliminator 9, a pre-exposure lamp 10, a negative charger, a full-surface exposure lamp 13, a developer 14, a transfer charger 19, a separation roller 20, and the like. 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 cassette 15 is moved along a paper feed guide 17 by a paper feed roller 16, reaches a timing roller 18, is bent by about 20 mm, and then stops. The print paper is driven so as to achieve good registration with the original image formed on the photosensitive drum 8.

In this first embodiment, since the printer section B does not have a large-capacity image storage memory, the timing roller 1 is
8 drive timings must be generated in some way.

If printer section B has a large-capacity image storage memory, the digital signal image of the Han draft sent from league section A is temporarily stored in the image storage memory, and then the image is stored in printer section B.
Since the reading timing of the stored digital signal image can be set freely, it is extremely easy to match the registration of the original image formed on the printing paper and the photosensitive drum 8. As in this embodiment, printer section B
If the device does not have a large-capacity image storage memory, such timing must be provided by the reader section A, which has the drawback of increasing the number of control signal lines and complicating the control.

FIG. 2 is a diagram showing the connection of digital image signals between the reader section A and the printer section B. As shown in FIG.

The BD double signal is a signal sent to the printer section B or league section A, which indicates the timing of the laser beam scanned by the laser scanner unit 25, and the league section A reads the Zagital electrical signal read in synchronization with this signal. The image is output to printer section B as a VI'DEO signal. VS
YNCm is a signal indicating the drive timing of the registration ψ roller.

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

In the printer section B, the scanned laser light is irradiated onto 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 point Y on the timing roller 18 comes into contact with the imaged original image at a point 2 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. If the relationship is that time A = waiting time, League Division A is VSYN
Since it is only necessary to start sending out the VIDEO signal in synchronization with the C signal, there is an advantage that the control circuit can be simplified.

However, in reality, due to mechanical space constraints, the relationship may be time A x time B, as shown in Figure 2. The present invention particularly provides a resist alignment method for such cases.

Timing chart 1 in Figure 4, part A in Figure 5
A more detailed explanation will be given using an example of a timing generation circuit.

In FIG. 4, a digital signal image is sent from the reader section A in synchronization with the BD double signal, a signal generated by the printer section B. The OVE signal is a signal generated inside the reader unit A in synchronization with the ED double signal, and the laser beam scans the effective area on the photosensitive drum 8 of the printer unit B after a predetermined time has elapsed since the rise of the BD double signal. This is a signal that is active while Therefore,
The league unit A only needs to synchronize the digital signal image in the main scanning direction during the period in which the OVE signal is active and transmit it to the printer unit B.

IE double signal, a signal generated in reader section A, during which the signal is active, the digital signal image is sent to the printer, section B
This is a control signal for output to.

This IE multiplied signal, for example, in part A, an SR flip-flop is set with a sensor attached to the reading edge position of the document placed on the document table, and reset with a sensor attached to the inverted position of the optical system)・It can be obtained by doing. The sensor that senses the SR rough flop should be placed at a position where it becomes active as early as the time C that satisfies the relationship: time A 10 hours C = time B from the reading tip of the document placed on the document table. Bye. The optical system has a run-up section before the reading edge of the document for scanning, so the sensor is placed in this run-up section. After the IE double signal rises, the VSYNc signal is
It becomes active during the 10VE signal section.

In printer section B, at the rise of the VSYN'C signal,
In this case, the one-shot/multi-contact vibrator is triggered to generate the drive signal RG for the timing roller 18. The RG signal may be kept active while the print paper passes.

VE multiplied signal, IE multiplied signal A 6 vE multiplied signal, which is an OVE signal in an active section, is output with a delay of time C from the V S Y N Cm signal. It is sufficient to output the VIDEO signal to the printer section B during the period in which the VE multiplied signal is active.

FIG. 5 shows a specific example of a circuit for generating these signals. The VE multiplied signal VSYNC signal is output from the OVE signal and the IE multiplied signal to the D type flip-flop 1.
Synchronized and generated by 02.104. The counter circuit 107 counts the OvE signal and activates the OUT output when the count value becomes equal to time C. OUT output is D type-flip flow, P1
It is cleared when it becomes 02 or non-active.
Be active. 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 explained above, according to Kibatsu n, it enables a printer registration adjustment method that does not use a large capacity memory and can record with a simple timing signal from the outside, and simplifies the configuration of the control circuit. can reduce the cost of equipment,
It makes it possible to reduce

[Brief explanation of the drawing]

Fig. 1 shows the internal configuration of a system 1K to which the present invention is applied, Fig. 2 shows the connection of electrical signal information between the league and the printer, Fig. 3 shows the basic idea of the present invention, and Fig. 4 5 is a timing chart diagram, and FIG. 5 is a timing generation circuit diagram, and 18 in the figure is a timing rotational diagram. Applicant: Canon Co., Ltd. Procedural amendment (method) ■ Indication of the case 1982 Patent application No. 97172 2, name of invention Printer 3 Person making the amendment Relationship to the case Patent applicant 4, agent August 1988 6o days (shipment date) 6. Engraving of drawings subject to amendment, content of amendment (no change in content) 386-

Claims (1)

[Scope of Claims] The receiver comprises an image forming means for forming an image of the received electrical signal information on recording paper, and a timing roller that stops the recording paper for one micrometer and feeds the recording paper in accordance with the recorded image by the image forming means. time A until the leading edge of the image formed by the image forming means reaches the leading edge of the recording paper; and 1. In a printer where the length relationship of time B from when the recording paper that has been stopped/stopped is fed to the above-mentioned timing roller until it reaches the above-mentioned image is time A x time B, the electrical signal First part of information Time A 10 hours C - Time B
The printer is characterized by adding dummy information of a time C equal to 1 and registering the electric signal information with the recording paper by moving a timing e roller in synchronization with the electric signal information.