JPS6249342A - Control method for scanning of document - Google Patents

Abstract

PURPOSE:To speed up a copying speed by moving a document scanner to a position close to a document tray of an ADF prior to the execution of the 1st copying in a mode using the ADF, and under said status, scanning the document while carrying the document to a platen set up in a copying machine body. CONSTITUTION:In the ADF mode, the document scanner is moved up to a position shown in C and stopped on the position of a sensor SE. When a copy button is depressed, a document is fed from a document tray 9 or 10 and stopped on the position of an APS roller 20. Then, the APS roller 10 is driven at a prescribed timing to carry the document to the platen. At that time, a light source 19a is turned on and the document is scanned simultaneously with the carrying of the document. Namely, the 1st copying is executedd during the carrying of the document to the platen. In case of multicopying, an optical system is immediately returned to its home position after the end of scanning and then the document on the platen is reciprocally scanned similarly to a normal copying mode.

Description

[Detailed Description of the Invention] Technical Field> ゛ This invention transports a document placed on a document tray onto a document table, makes a required number of copies, and then discharges the document to a document output tray. automatic document feeder (ADF)
), and particularly relates to an N-stripe scanning control method in a mode using the ADF.

<Background of the Invention> Generally, when copying using an ADF, the originals placed on the original tray are sequentially conveyed to a fixed position on the original platen.
Thereafter, the document scanner including an optical system is moved back and forth to scan the document. Conventionally, this operation was performed in the same way for all copying operations.

<Object of the Invention> The object of the invention is to prevent the tU
An object of the present invention is to provide a document scanning control method capable of increasing the copying speed without changing the speed of the copying process by simultaneously scanning the documents being fed.

<Structure and Effects of the Invention> The present invention provides an advantage in that when the copy mode is a mode that uses an ADF, the original scanner is set to an ADF mode before copying the first page.
According to the present invention, the present invention is characterized in that the copying machine moves to a position close to the document tray F, and in that state scans the document while feeding the document one step onto the document table of the main body of the copying machine. For example, the original can be scanned at the same time as the original is transported from the ADF's original tray to the original table of the copying machine. This method has the advantage of faster copying speed than the method of moving the scanner. <Embodiment> FIG. 2 is an overall structural diagram of a copying machine that implements the document scanning control method according to the present invention.

(2) is a main body of a copying machine incorporating a copying process section including a photosensitive drum 2; The copying machine body 1 has a paper feed power of 3.4 cents.
is loaded. Reference numerals 5 and 6 denote cassette empty detection sensors for detecting loading of the paper feed cassette.

7 is an ADF mounted on the upper part of the copying machine main body 1, and has two document trays 9 and 10. 8 is the original tray 9,1
1) Place the original marked at 0 in the exposure position of the copying machine main unit l.
1 feed, and after the exposure process is completed, place the copied original in the ADF?
This is a document conveyance heald that discharges the document onto the document discharge table 13 in the upper part. When documents are placed in both document trays 9 and 10, copying is performed in the order of upper and lower trays. 1L12 is a document detection sensor arranged in each document tray. The document detection sensors 1) and 12 are composed of light emitters and receivers, and detect the presence or absence of document cents by receiving reflected light from a reflective sheet (not shown) provided on the document tray. That is, when a document is set, the sensor light reception l decreases, thereby detecting the document center. Reference numeral 18 denotes a paper feed roller that feeds the original on the original tray. Also, 20 is a paper feed roller 18
A timing roller (APS roller) that temporarily stops the fed document and sends it to the document table at a predetermined timing.
It is.

A sorter 14 is attached to the copying machine main body 1, and the sorter 14 has a plurality of bins 1.5.

A document scanner that scans a document sent onto a document table includes a light source 19a and a first mirror 19b. A light source 19a illuminates the original, and the reflected light is reflected by mirrors 19b to 1.
It is reflected by 9d and passes through lens 19e. Further, the light is reflected by the fourth mirror 19f and reaches the exposure point on the photosensitive drum 2. In the copying machine having the configuration shown in FIG. 2, when scanning a document, the document scanner moves in the direction of the arrow at a speed V, and the mirror 19c,
19d moves in the direction of the arrow at a speed of V/2. In the normal copying mode, the optical system moves forward at such a speed distribution, and then moves back at an even higher speed to complete the copying of one sheet. That is, the optical system moves back and forth the same number of times as the number of bones to be copied.

FIG. 3 shows the movement state of the optical system when the copy mode is the ADF mode. As shown in the figure, in the ADF mode, a document scanner consisting of a light source 19a and a first mirror 19b moves to a position close to document tray 9.10. It is desirable that this position be as close to the APS roller 20 as possible. Of course, in this case as well, the second mirror 19c
, the third mirror 19d also moves so that the length of the optical axis is constant. The original has already been fed from either original tray 9 or 10 to the position of A'PS roller 20. With the document scanner moved to the position shown in Figure 3,
The PS roller 20 is driven and the original is conveyed onto the original table of the main body l of the copying machine.

At this time, the light source 19a is turned on, and the document is simultaneously scanned while being conveyed onto the document table of the copying machine main body l. The first document is scanned in this way.

In the case of multi-copying, the second and subsequent copies are performed by moving the optical system one time fjL in the same way as in the normal copying mode. When multiple copies are not being made and there are many originals on the original tray, the originals are sequentially conveyed while the position of the optical system is fixed. In this case the manuscript.

The document is ejected onto the document eject table 13 without stopping on the document table of the copying machine main body l.

Figures 1 (A) and (B) show the optical system movement state in normal copy mode, and Figures (C) and (D) show the AD
It shows the moving state of the optical system in F mode.

In FIG. 1, (A) is when the document scanner is at the home position. In the figure, SA is a home position sensor, SB is a scan start position sensor, SC is a small size document return position sensor, SD is a large size document return position sensor, and SR is an overrun detection sensor. Normally, the optical system is stopped at the home position as shown in (A). When copying is performed in a normal copying mode, a document scanner is moved back and forth with respect to a document set on a document table to perform copying. That is, when a document is set on the document table, copying conditions are input from the operation panel, and the copy button is turned on, the document scanner is controlled to a constant speed from the home position until it reaches sensor SH, and the document scanner is When it detects the passage of the ps crawler, it sends a ps crawler movement signal to the main body of the copying machine. In the main body of the copying machine, the already fed original is conveyed to the transfer section by receiving the PS roller drive signal. Then sensor SC or SD
When the original scanner is detected at , the original scanner is returned to prepare for the next copying operation.

The sensor SC has a document size of 85. It works when the size is small such as A4, and the sensor SD is B4. It works when the size is large such as A3. FIG. 1(B) shows the state when the document scanner starts scanning the document 16 placed on the document table.

Next, the operation in ADF mode will be explained. When sensor II or sensor 12 detects that a document is set on either document tray 9 or 10, the ADF mode is automatically set. When the ADF mode is entered, the document scanner moves to the position shown in (C) and stops. That is, it stops at the position of sensor SE. When the copy button is pressed, a document is fed from either document tray 9 or 10 and stopped at the APS roller 20 position. Then, at a predetermined timing, A
The PS roller 20 is driven and conveys the original onto the original table.

At this time, the light source 19a is turned on and the document is scanned simultaneously while the document is being conveyed.

In other words, the first copy is made while the original is being conveyed onto the original table. When this scanning is completed, the optical system immediately returns to the home position in the case of multi-copying, and thereafter scans the original on the original platen by a reciprocating operation as in the normal copying mode. If it is not multi-copy, do not place the original on the original table (immediately eject it to the original ejection table 13).

FIG. 1(C) shows the operation when copying the first original in ADF mode. In other words, original L6 is A
While being conveyed onto the document table by the PS roller 20, the document is scanned by the document scanner. FIG. 5(D) shows the operation when copying the second and subsequent sheets. For the second and subsequent sheets, the document scanner scans the document by reciprocating the document table as in the case shown in FIG. 9(B).

Note that when copying multiple originals using multi-copying in ADF mode, when scanning the last original in multi-copying, the original scanner does not return to the home position and the first
Stop at the position shown in Figure (C). By doing this, it is possible to cope with the scanning of the first sheet of the next original.

As described above, in ADF mode, it is possible to copy originals with the optical system fixed, so the overall copying speed increases as the number of originals increases, not only in the case of single copying but also in the case of multi-copying. It can be done quickly. In this embodiment, the document scanner is stopped at the sensor SIF, which is the overrun position, in the ADF mode, but it may be stopped at any position as long as it is close to the document tray. An auxiliary roller may be provided immediately after the APS roller 20, and the document may be scanned between these rollers. This has the advantage that document scanning becomes more stable.

[Brief explanation of the drawing]

FIGS. 1A and 1B are diagrams illustrating a method of controlling a document scanner in a normal copy mode. Also, the same figure (C
) and (D) are diagrams illustrating a method of controlling the document scanner in ADF mode. FIG. 2 is a schematic structural diagram of a copying machine in which the document scanning control method according to the present invention is implemented, and FIG. 3 is a diagram showing the state of the optical system when the ADF mode is executed in the copying machine. 1-copying machine body, 2-photosensitive drum, 7-ADF, 9,10-original tray, 2O-AP
S roller.

Claims (1)

[Claims] (1) Automatic document feed that transports the original placed on the original tray onto the original table of the copying machine using the original transport means, makes the required number of copies, and then ejects the original into the original output tray. In the copying machine equipped with the device, when the copy mode is a mode using the automatic document feeder, moving the document scanner from the home position to a position close to the document tray before copying the first sheet, A document scanning control method characterized in that the document is scanned while conveying the document onto the document table in this state.