JPH04129949A - Automatic document feeder - Google Patents

Abstract

PURPOSE:To eliminate a document, left as placed forgotten at transcription time of an ADF mode, so as to prevent a trouble of jam generation or the like by automatically discharging the document by a control means, when the document is left placed forgotten on a platen, and then performing transcription of the ADF mode. CONSTITUTION:In the case of an ADF mode, whether a detection signal of a document on a platen 11 from a copying machine C is on or not is checked, and when the signal is on, a document M is judged left forgotten, to discharge the document M on the platen 11 by turning on a belt driving motor 19. Next, in an ADF1, when a document feed signal from the copying machine C is turned on, the mode is transferred to document feed action, and when the document reaches a predetermined position on the platen 11, the document is stopped to turn on a copy request signal to the copying machine C. By this signal, the copying machine C is advanced into copying action, and when it is finished, a document discharge signal is turned on to the ADF1. By this signal, the ADF1 performs discharge action of the document M on the platen 11, and when the document M is normally discharged passing through a paper discharge sensor 15, document discharge action is ended.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention (j) relates to an automatic document feeder that feeds a document to a document reading position of an image forming device such as a copying machine, and more specifically relates to an automatic document feeder. The present invention relates to a control means for a sending device.

(11) Prior Art Conventionally, copying machines equipped with an automatic document feeder (hereinafter referred to as ADF) have been used for the following copying operations.

(2) Copying work to the rack mode 1 in which a sheet original is copied using the ADF as a document pressure plate. (2) A plurality of sheet originals are set on the ADF and copies are automatically performed in the ADF mode.

(c) Problem to be Solved by the InventionHowever, for example, in the conventional example described above, after copying in rack mode 1 to 2, the next user leaves the original on platen 2 while copying in ADI mode. If you do so, the previous user's original remaining on the platen may be transported during the ADF mode copying operation, causing an unexpected jam or being mixed with the next user's original. There were some drawbacks, such as:

Therefore, in the present invention, when copying a document in the automatic document feeding mode 1~, when a document left behind on the platen is detected, the document that has been left behind at 11'T is first automatically ejected based on the signal. It is an object of the present invention to provide an automatic document feeding apparatus which solves the above-mentioned problems by providing a control means.

(d) Means for solving the problem The present invention has been made in view of the above circumstances.
For example, with reference to FIGS. 1 to 3 (not shown), automatic document feeding mode and book mode 1- are used to operate a copying machine ().
In the automatic document feeder (1) in which a document CM) is set on the platen 11) of the platen 11), the platen 11)
, , Detection means (S) for detecting the original document (M,)
is provided, and when the original (M) is fed in the automatic original feeding mode, when the original (CM) left on the platen (11) is detected by the detection means (S), the original (M) is control means (100, 80
0).

(E) Function Based on the above configuration, the document (M) can be automatically fed to the platen (11) on the copying machine (C), and the operator can feed the document one by one to the platen (11) on the copying machine (C). do. At this time, when automatic document feeding is performed, if the previous worker has left the document (M) on the platen (11), the detection means (S)
As soon as it is detected, the control means (10
0,800) first automatically discharges the original (M).

Note that the symbols (' and J in parentheses above) are illustrative and do not limit the Ikasagi invention.

(f) Example The present invention will be explained in detail below.

Figure 3 shows the automatic document feeder i'i1.

In the figure, reference numeral 2 is a stacking tray on which originals M are stacked and set, and these trays 1 to 2 support the originals M, and are arranged tilted downward toward the original feeding direction so that the original feeding side is lower. ing. As a result, the fed documents M are stacked together in the sending direction.

4 is a half-moon roller that rotates in the direction of the arrow to feed the document M to the downstream separating section.If there is no document M in 1-ray 2, the notch part is stopped facing the niga, controlled to do so. A feeding roller 5 feeds the document M on the tray 2 by rotating it in the direction of the arrow.

Further, 6a and 6b are separating rollers, and by rotating the separating heald 6 in the direction of the arrow, the separation rollers 6a and 6b are separated from the feeding roller 5.
Among the originals M stacked on tray 2-1, the lowest original M is separated one by one. The feed roller 5 and the separation bell 1 constitute a portion supply section.

3a and 3b are transmissive type sensors for detecting the document placed on the tray 1F, 3a is an LED, and 3b is a phototransistor, respectively. The document M sent from the separation supply units 5 and 6 is sandwiched between registration rollers 9a and 9b that are pressed against each other, and is sent onto the platen 11 by rotation of the rollers 9a and 9b in the direction of the arrow. Paper feed sensors 8a and 8b are transmission type photosensors that detect the leading edge and trailing edge of the document. The belt 10 of the platen 1-11 of the I copying machine C is an endless belt 1- with a width large enough to cover the entire surface of the sheet original M, and its surface allows the original M to slide onto the platen 11- with frictional force. Drive roller 1 with a sufficient coefficient of friction so that it can be conveyed in the direction of the arrow.
．． Oa and turn roller 1, which is applied to Ob, to the bell) 10, and drive roller 10a are constructed so as not to cause slippage.

The 10th ejection rollers 12a and 12b are pressed against each other, and as the full-length heald 11 moves in the direction of the arrow, the original 411 taken out from the platen 11 is rotated in the direction of the arrow, sandwiched and conveyed, and the original M is , discharge No. 20-ra 13a, 13b
The paper is sandwiched between the two and discharged onto the discharge tray 14. Paper ejection sensor 1
A sensor 5 detects the leading edge and trailing edge of the document.

In addition, a half-moon roller 4, a feeding roller 5, a separation roller 6a,
The registration roller 9a is driven by the motor 7, the drive roller 10a is driven by the motor 19, and the discharge box 1 and the 20th rollers 12a and 13a are driven by the motor 20. An electromagnetic clutch 21 is interposed between the registration roller 9a and the motor 7, and an electromagnetic clutch 22 is provided on the motor 19 to stop the conveyance of the document M at a predetermined position.
are attached to the motors 19, 20 (J clock disks 23, 24 are attached to the motors 19, 20,
The bell 1 to the clock interrupter 25 and the paper discharge interrupter 26 are respectively taken (=t&-J and C).

Then, as shown in FIG. 1, on the back side of the platen 11 near the document reference point A, there are photoreceptors Sb, AI) on the side of the photoI-1 and I-1, which become photoreceptors.・:1)
A light emitting element Sa and a document sensor S are installed.

FIG. 2 shows a circuit block diagram of the automatic document feeder 1.

The circuit 00 is mainly composed of a one-chip microcomputer (hereinafter referred to as microcomputer), and further performs arithmetic control regarding the ADF while exchanging signals with the controller 800 of the copying machine C. The microcomputer's input capo-1-T 1 to ■4 (J, the entrance document sensor St provided on the downstream side of the tray 2 described above (3a in FIG.
3b), the paper feed sensor S2 (8a, 8b in Fig. 3) installed on the document transport bus, and the paper ejection sensor S3 (8a, 8b in Figure 3).
The signal 15) in Fig. 3 and the signal of the A I) F open/close switch are respectively input.

In addition, the interrupt terminals TNTi and TNT2 of the microcomputer are connected to the above-mentioned bell l-clock incretor which detects the rotation of the motor by the clock disk 22 attached to the shaft of the drive motor 19. A signal from 25 and a signal from paper ejection clock interrupter 26 are inputted, and these serve as a reference clock for the amount of movement of paper feed, and the microcomputer's internal counter performs operations from 1 to 1.

On the other hand, the operation signals of the aforementioned separation drive motor 7, heald drive motor 19, electromagnetic brake 22, paper ejection drive motor 20, and electromagnetic clutch 21 are output to output ports 1-Oit~(]5 of the microcomputer, and each Each output load is controlled via an l-river.

In addition, signals are sent and received to and from the controller 800 of the copying machine C via a cable, and the microcomputer's manual input signals (5 to 8) each have a document detection signal, a document feed signal, a document discharge signal, and a signal to the mode 1. A copy request signal and a document detection signal are output from the output ports 06 to 07.

The operation of this embodiment will be explained with reference to flowchart 1 shown in FIG.

First, check whether there is a document M or C in the document 1-ray of ADF] ((Step 8
1), if the original M or the printer 1- has been set, A I) I”
Copying work to Mo-1 will begin, and if it has not been copied to Sera-1, it will be transferred to Tsukukumo-1. In the case of ADF mode I-,
Original detection signal of platen 110 from copying machine C - or ON
If it is ON, it is assumed that the document M has been left behind (step 82), and the heald drive motor 19
(Step 33) Platen 1 ], ly
, IJI) M is output from IJI (step 84).

If the original detection signal is OFF, the original ejection operation is not performed (step 35).

Therefore, if A I) F1 receives the document feed from the copying machine C or turns ON (step S6), it moves to the document feed operation (step S7), and the document M reaches a predetermined position on the platen 1. At that point (step 38), stop the original (
Step S8), turn on the COP Y request i;i to the copying machine 0 (step 8?)).

In response to this signal, the copying machine C starts a copying operation, and when the copying operation is finished, turns on the original discharge signal to AI) Fl (step 510). A I) I=" ] performs the ejecting operation of the document M on the platen 1 according to this signal,
When the document M passes through the document discharge sensor 15 and is normally discharged, the document discharge operation is completed (step 511).

1 checks whether or not original M is set on tray 11- (step 312), and if it is set on copying machine C.
/l) and the like (step S6), and repeats the above-described operation. When the original M is fed and placed on the rays 1 to 2, the operation of the AD Fl ends (step 513).

Next, another embodiment will be described.

The forgotten original M can be removed by controlling the operation to be carried out a predetermined time after the copying machine C is in the standby state C and the original M on the platen 1 is detected.

That is, the process will be explained with reference to flowcharts 1 to 5 in FIG.

First, when copier C is in standby mode (step 5)
21), AI) [P] is the platen] If the document detection signal from the sensor S of the platen 11- is turned on (J, this document M is determined to be a document M that may have been left behind (step 52).
2) Start a timer until automatic document ejection (step 523). Then, when the timer 1 ends - C (step 524), the document ejecting operation of the platen 11F is performed (step 825). If the original ji:s is removed during that time, the Sera I of manuscript M 1 to Ray 21-
Return to step 826.

Similarly to the above, if the ADF 1 is the original feed signal from Copy@C or is ON (step 827), the process moves to the original feed operation (step 528), and the original feed signal from the copy@C is ON.
] When it reaches the specified position above, stop the C1I+it draft (
Step 529) A copy request is sent to copying machine C and turned ON (step 830).

In response to this signal, the copying machine C starts a copying operation, and when the copying operation is completed, turns on the document discharge signal to the ADFI (step 531).

In response to this signal, the ADFI performs a pladen+original paper ejection operation (step 532), and if the original or paper passes through the paper ejection sensor and is normally delivered, then the JJI paper operation δ5 is completed.

Then, A D do 1 (J again original 1 ~ Ray 2 (- to j1
7) Check if Maki M has been sent to Sera 1,
If the document is set, wait for the document feeding signal from the copying WC (step S33); 1. Repeat the above action.

When the original M is fed to tray 2+, the ADF ends its operation (step 534).

(G) As described in detail, according to the invention, if there is an original left on the platen, the original is automatically ejected by the control means, and then the copy of △D tomo 1- is made. Let's do it, A
When copying with DF mode, there are no leftover originals, so problems such as jams can be prevented.

[Brief explanation of drawings]

2. Fig. 1 is a perspective view showing a sensor for detecting a document on a platen according to an embodiment of the present invention, Fig. 2 is a control block diagram of the embodiment, and Fig. 3 is an automatic document feeder according to the present invention. A longitudinal side view of the apparatus, FIG. 4 (J) Flowcharts 1 to 5 are flowcharts of other embodiments. 1... automatic document feeder, 11... platen,
1, OO, 800... Control means (circuit of automatic document feeder, controller 1-roller of copying machine) C... Copying machine, M... Original, S... Detection means (document sensor ) Kawahara njin Canon Co., Ltd.

Claims (1)

[Claims] 1. By automatic document feeding mode and book mode,
In an automatic document feeder that sets a document on the platen of a copying machine, a detection means is provided to detect the document on the platen, and when the document is fed in the automatic document feed mode, the document is not left on the platen. An automatic document feeding apparatus characterized in that the automatic document feeding apparatus further comprises a control means for automatically ejecting the original when the detection means detects the original.