JPS60144762A - Automatic original carrying device - Google Patents

Abstract

PURPOSE:To prevent generation of blank copies by changing the timing of the start of original carrying in accordance with a difference between the original supply mode, where originals are carried automatically, and the original supply mode where originals are placed manually on an exposure position. CONSTITUTION:When automatic carrying is selected, it is discriminated whether a delay timer expires or not (whether a flag F of a delay timer UP is ''1'' or not) (step 4). If the delay timer expires, that is, if a prescribed time of original setting elapses, it is discriminated whether a flag of original signal transmission is set or not (F=1 or not), that is, whether an original signal is transmitted or not. If the delay timer does not expire in the step 4, that is, the time of original setting does not elapse, it is discriminated whether the delay timer is started or not (step 8); and if the delay timer is started, an original check routine is repeated because of queuing. If the delay timer is not started in the step 8, the timer is set to, for example, 300msec, and the flag of timer start is set, and the timer is started.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to automatic document feeders such as copying machines, facsimile machines, printers, and the like.

Conventional technology Conventional automatic document feeders in copying machines, etc. include those with an automatic document feeder (ADF) function that automatically feeds multiple sheets of originals placed on the top of the document table; Some printers have a semi-automatic transport (SADF) function that automatically transports a document placed on a table to a predetermined exposure position.

In a conventional automatic document feeder, if the document switch that confirms that a document is loaded is turned on and the document feed is started at the same time, the document may be loaded before the document is set properly. Since this may cause problems such as image distortion or document skew, please set the document after a certain period of time (e.g. approximately 0.8 to Q, 5 seconds) has passed after the document switch is turned on. The device is configured to send a signal indicating that a document exists.

- A signal indicating that a document is present is sent to the main body control section after the delay timer has timed up by a certain period of time during which the document is set on the IC.

With conventional automatic document feeders, even after selecting one of the ADF and SADF functions, the first copy using a copying machine is performed using the print button in the same way as when copying is performed by pressing the print button once. Start by pressing . In the print button start mode, in which the process starts by pressing this print button, if you press the print button immediately after setting the original on the document table, that is, within the delay time,
Since the document existence signal is not sent, a signal to start document transport is sent from the main unit control unit. Just like when the document is placed in the exposure position by hand, only the copying process is started without the document feed IJ. It turns out. In this case, a blank copy is produced, resulting in unnecessary copying.

Purpose The present invention solves the above-mentioned drawbacks of the conventional automatic document feeder, and enables the document feeder to automatically feed the document or manually place it in the exposure position as in the case of copying a book, depending on the document feeding mode. An object of the present invention is to provide an automatic document feeder that changes the timing of starting document feed.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The IN structure of the present invention that achieves the above object will be explained based on the embodiment shown in the drawings.

First, looking at the conventional device, as shown in Figure 1, in the document check routine, it is determined whether the document switch (abbreviated as document SW) is ON or not. , it is necessary to determine whether the delay timer's time-up flag is lit, and if the delay timer's time-up flag is not up, it is determined whether the delay timer itself has started operating.
When it is working, the original checking routine is repeated again, and when it is not working, the delay timer is activated and the original checking routine is repeated again. When a document is placed in the automatic conveyance state, the document is not conveyed until the delay timer times up, resulting in a copy without the document as shown in mJ.

In the present invention, as shown in FIG. 2, in the document check routine, it is determined whether the document SW is ON or not (step 1).
If the answer is YES, it is determined whether or not the automatic transport state (auto mode) is in effect, for example, whether the auto mode LED is ON or not (Step 2); if the answer is no, a flag for sending a document signal indicating that there is a document is set. I'm looking forward to it
It is determined whether IJ F = 1 (step 3).

When step 2 is YES, that is, when automatic transport is selected, whether the delay timer is up (whether F = l of delay timer UP)
(Step 4).

When Y'ES, that is, when the predetermined time for setting the original has elapsed, it is determined whether the original signal sending flag is set or F=1, in other words, whether the original signal has been sent. (Step 5).

If step 2 is No, the process immediately proceeds to step 5. At this time, for example, it is print button start mode,
This is a case in which the document is not automatically transported.

If step 5 is YES, the main body is instructed that there is already a document, and the document check routine is repeated again. If step 5 is NO, send a document presence signal to the control section of the main body (step 6), then set a flag for sending the document signal (step 7), and repeat the document check routine again.

If step 4 is No, that is, the document setting time has not elapsed, it is determined whether the delay timer has started or not (step 8). If YES, the document checking routine is repeated because the time is still waiting.

If step 8 is NO, set the timer to 300 m, for example.
5ec, sets the timer start flag, and starts the timer (step 9). After setting the timer to 1 star, repeat the routine again.

If step 3 is NO, the document is on standby, so the routine is repeated.

If step 3 is YES, the document has been transported, so reset the document signal sending flag in step 1.
0), send a document heat signal to the control section of the main body, step 11), reset the timer, reset the delay timer start F, and reset the delay timer UPF (step 12). Repeat the manuscript check routine below.

In the flow shown in Figure 2, the delay timer is activated only when the auto mode is on, that is, when the auto mode LED is lit, and at other times, a document presence signal is immediately sent to the control unit of the main unit, thereby preventing blank copies. be able to.

As shown in FIG. 3, L 1 (D 21 ) displays the original position on the main unit's display section, LED 22.5 displays the display to confirm the document setting status, and L E D 23 displays the ADF auto mode. LED indicating insertion
24 is provided, and as shown in FIG.
is on the jam display LED21, port P22 is on the set confirmation display LED22, and port P23 is on the auto mode display L.
A port P24 of the BD 23 is connected to an insertion display LED 24 that indicates a standby state due to document insertion, and each LED is turned on. Furthermore, the first switch 26, which is a document set SW, connects S A, D F to port P25.
The second switch 27 for selecting
, the third switch 28 for selecting D F is connected to port P27.
It is connected to the.

AI)FCPu25 is connected to CPU29 of main body and AD
Signals instructing selection modes such as F mode and 5 ADF mode and document presence signals are sent from the ADF CPU 25 to the main body CPU.
29, and a document conveyance start signal, document discharge signal, etc. are sent from the main body CPU 29 to the ADFCPU 25.

The auto mode display LED is turned on only when the 5ADF mode is started automatically, that is, when the print button is started without pressing the print button.

Although FIG. 2 only shows the document checking routine of the automatic conveyance device according to the present invention, FIG. can be considered as an example.

In FIG. 5, it is determined whether the print switch (abbreviated as print SW) is ON or not (step 21), and if YES, it is determined whether there is a document presence signal (step 22).
). If step 22 is No, the operation is performed according to the platen copy mode routine (step 23).

The print SW is used in common with the original start switch.

If step 22 is YES, determine whether the mode is ADF mode or not (step 24); if NO, S A T)
Step 25) to determine whether it is F-mote' or not.
If NO, the pressure plate copy mode routine of step 23 is followed. That is, if there is no document when the print SW is ON, the pressure plate copy mode is set regardless of the mode, and even if there is a document, if it is not in either ADF or S A I) F mode, the pressure plate copy mode is selected.

If YES in step 24 and YES in step 25, that is, if there is a document in either ADF mode or 5ADF mode, set a flag called autostart F indicating the start of automatic document feeding (step 26) and feed the document. A signal is sent to the document conveyance device (step 27), and the document is conveyed by the automatic document conveyance device.

If step 21 is NO, it is determined whether auto start F is set or not. If step 28) is NO, that is, if the print SW is not ON and auto start is not performed, the routine is repeated because it is in a standby state.

If step 28 is YES, it is determined whether the mode is ADIi' mode (step 29), and if YES, it is determined whether there is a document presence signal (step 30). If step 30 is YES, step 27 sends a document feed signal to the document conveyance device. Step 30 is NO
In this case, reset AutoStar 1-F (step 31). Repeat the following routine. In other words, in ADF mode, all the set documents are automatically fed, so if the auto start F is set and there are documents, the document feed signal is sent, and if there are no documents left, the auto start F is sent. is reset in step 31 to stop autostart. Next time you set the original, start again by turning the print switch ON. If you do not set the print switch to start, when setting a hand-held original on the document table, the automatic start may occur and the document may begin to be fed before it is completely set, resulting in problems such as jams. Once the auto start is finished, next time, turn on the print switch to start the auto start.

If step 29 is NO, it is determined whether there is a document presence signal (step 32); if YES, a document feeding signal is sent to the document conveying device; if NO, the routine is repeated.

If auto start is set and the mode is not ADF mode, the mode will naturally be SAI), so if there is a document, it will send a document feed signal, and if there is not, it will wait for the document to be sent.

In S A, I) F, originals are set one by one, so there will be no original each time, but in order to auto-start, in this case, auto screen 1-F will not be reset even if there are no originals left.

Effects According to the present invention, even if the print button is pressed immediately after setting the original, that is, even if the operation is performed quickly, the original will not be unfed, so it is possible to prevent the waste of blank copies.

[Brief explanation of drawings]

FIG. 1 is a flowchart of a conventional document conveying device, FIG. 2 is a flowchart of a document check routine of the present invention, FIG. 3 is a diagram showing a display section, and FIG. 4 is a diagram showing some connections.
FIG. 5 is a flowchart of a routine for sending a document feed signal from the main body control section to the document conveying device. Figure 3 Figure 4

Claims (1)

[Claims] In an automatic document feeder that has an ADF function and a SADF function and uses a document start switch and a print switch of a copying machine in common, a delay timer is activated only when in 5 ADF mode and document auto start mode. Automatic document feeder.