JPH0519142B2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) The present invention relates to a copying machine with an automatic document feeder.

(Prior art) In a copying machine equipped with an automatic document feeder, the automatic document feeder is operated in automatic document feed mode (hereinafter referred to as ADF mode) or semi-automatic document feed mode (hereinafter referred to as ADF mode).
When you perform one-to-one copying (copying one page per original) in SADF mode, the original is ejected before the copy paper is ejected,
The original precedes the transfer paper. The amount of advance increases further when a sorter or the like is connected to the main body. In this case, if a jam occurs in the transfer paper in the main body, even though the original is ejected, the transfer paper after the jammed transfer paper is not ejected and becomes invalid, so it is necessary to recopy that amount. When recopying, it is necessary to reset the original to the exposure position one by one.
Previously, the automatic document feeder was automatically set to SADF mode and the document was reset.

However, in this copying machine with an automatic document feeder, the original is reset in the SADF mode, which is more inconvenient than when the original is reset in the ADF mode. There are also cases where it is desired to reset the original in the pressure plate mode.

(Objective) An object of the present invention is to provide a copying machine with an automatic document feeder that can copy documents that need to be recopied in ADF mode.

(Structure) The present invention will be described below based on examples with reference to the drawings.

FIG. 1 shows an embodiment of the invention.

The automatic document feeder 1 is pivotally mounted on the upper part of a main body 2, and the main body 2 is of a well-known type. In the pressure plate mode, the automatic document feeder 1 does not transport the document but is used as a pressure plate. As is well known in the automatic document feeder 1, when a document is placed by hand on the document placement table 3, the document set sensor 4 detects the document and turns on. ADF
In this mode, this state is the standby state. At this time, when a paper feed signal comes from the main body 1, a motor (not shown) rotates, and the separation belt 5, pull-out roller 7,
The conveyor belt 8 rotates, the document is conveyed by the separation belt 5, and the document is separated into one document by the separation blade 6. This document is conveyed onto a transparent plate 9 of the main body 2 by a pull-out roller 7 and a conveyor belt 8, and after the trailing edge thereof passes a paper feed sensor 10, it is stopped at an exposure position on the transparent plate 9. As a result, the conveyance belt 8 and the discharge roller 11 are rotated by the conveyance motor in response to a paper discharge signal from the main body 2 which is set at the exposure position on the transparent plate 9, and the document on the transparent plate 9 is transferred to the discharge tray 1.
It is discharged to 2. At this time, the ejection sensor 13 detects the ejected document, and a jam in the document is detected based on the detection signal. Here, the separation belt 5 is driven by a separation motor.

FIG. 2 shows a control circuit of the automatic document feeder 1 in this embodiment. A one-chip microcomputer (8749/8049) 14 takes in signals from the document set sensor 4, paper feed sensor 10, ejection sensor 13, etc., and outputs the signals from the I/O expander (8243).
15 and 16, a display 17 consisting of a 7-segment light emitting diode with a 2-digit configuration, and a separation motor M
1. Output data and control signals to the transport motor M2, clutch CL, etc. Further, the microcomputer 14 is connected to a read-only memory (8755/8355) 18 with an input/output port, and exchanges signals with the main body 2 via a copying machine interface 19.

The microcomputer 14 operates according to the program in the read-only memory, and FIG. 3 shows a part of its main routine (pulse count routine etc. are omitted). That is, the main routine checks the main body jam, paper feed command check, paper discharge command check, first copy paper start check,
Final copy paper discharge check, paper feed JOB check,
Performs paper output JOB check, mode check, data output, etc.

FIG. 4 shows the main body jam check routine. In this routine, the microcomputer 14 checks the transfer paper jam detection signal from the main body 2, and when a transfer paper jam occurs in the main body 2, it reads the contents of the copy counter. Check. This copy counter counts the number of originals to be recopied, and when the content is 2 or more, a "-" sign is displayed at the 10th position of the two-digit display 17, and at the same time, the display 17 Display the contents of the copy counter in the first place. Here, even if a sorter is connected to the main body 2, the contents of the copy counter will only reach 4 at maximum. In addition, the mode mode flag F is set to enter the mode mode (a mode in which the document is reset for recopying), and if the document is being transported or there is a document on the transparent plate 9, the document is ejected. Transport motor M to
By rotating 2 by 1500P, the conveyor belt 8
and rotates the discharge roller 11. It takes about 1300P from the start of document conveyance to the completion of ejection.
If the original is ejected normally, it will remain as is, but if the original is not ejected normally, it will jump to the original jam routine. The method for determining whether a document is being ejected normally is to use a counter that counts up when the document starts to be conveyed and counts down when the trailing edge of the document passes the ejection sensor 13. If the counter is φ after the conveyance motor M2 has rotated by the above 1500P, the document has been ejected. It is assumed that the original is ejected normally, and if it is not φ, it is assumed that the document is jammed.

FIG. 5 shows the paper feed command check routine. In the main body 2, the copying operation is performed when the print switch is turned on by the user and an instruction is given to start the copying operation.
In ADF mode, a paper feed command is issued to set the original at the exposure position, but the microcomputer 1
4 is when this paper feed command is received in ADF mode, or when the document set sensor 4 is turned on and a paper feed command is received in SADF mode, in mode mode, if the document sensor off F is not 1, it remains as is, and the document sensor 4 is turned on. If off F is 1, when the paper feed JOB counter is φ, the paper feed JOB counter is set to 1,
When the paper feed JOB counter is not φ, the paper feed JOB counter is in progress, so it is left as is. When not in mode mode, if the paper feed JOB counter is φ, the paper feed JOB counter is set to 1.

FIG. 6 shows the discharge command check routine. In the ADF mode, the main body 2 issues a paper ejection command after copying (exposure) a set number of originals at the exposure position. When the microcomputer 14 receives this ejection command in the ADF mode, or when the document set sensor 4 turns on and receives the ejection command in the SADF mode, if the paper ejection JOB counter is φ, this ejection is performed.
Set the JOB counter to 1.

FIG. 7 shows the start check routine for the first sheet of copy paper. When the main body 2 makes a first (first copy) copy of a document set at the exposure position onto a transfer sheet, it outputs a first sheet start signal when the transfer sheet leaves the sheet feeding device. The microcomputer 14 does not accept the first sheet start signal when the mode mode F is 1, and increments the copy counter when the mode mode F is φ. In this case, the counter UPF is used as the erroneous count prevention flag.

FIG. 8 shows the final copy paper discharge check routine. When making the final copy of an original set in the exposure position on main unit 2 onto transfer paper, when the transfer paper is ejected from main unit 2 (if a sorter is connected to main unit 2, the transfer paper is placed in the sorter's bin). The main body 2 determines this and outputs a final copy paper ejection signal. When the microcomputer 14 receives the final copy paper discharge signal, it causes the copy counter to count down. In this case as well, count DOWNF is used as a flag to prevent erroneous counting.

FIG. 9 shows the paper feed job check routine.
In this routine, the paper feed job is advanced according to the contents of the paper feed JOB counter. For example, when the paper feed JOB counter is 1, the separation motor flag MIF and clutch flag CLF are set and the paper feed JOB counter is set to 2, and when the paper feed JOB counter reaches 2, the clutch flag CLF is reset at a predetermined timing. Set 3 to the paper feed JOB counter.
Note that the paper feed JOB counter is cleared when the paper feed JOB ends.

FIG. 10 shows the paper discharge JOB check routine.
In this routine, the paper discharge job is advanced according to the contents of the paper discharge JOB counter. For example, when the paper discharge JOB counter is 1, the conveyance motor flag M2F is set and the paper discharge JOB counter is set to 2. Paper discharge job
The counter is cleared at the end of the paper ejection job.

FIG. 11 shows the data out routine. This routine outputs the contents of each flag and
By turning on and off components such as clutches, for example, outputting a separation motor flag MIF to control the separation motor, outputting a flap flag CLF to control the clutch for driving the pull-out roller 7, and outputting a conveyance motor flag M2F. Controls the transport motor M2.

FIG. 12 shows the mode check routine. In this routine, when modoshi mode F is φ, it is left as is, and when modoshi mode F is 1, if the copy counter is not φ, its contents are displayed on the display 1.
If the document set sensor 4 is turned off, the document sensor off F is set. Further, if the copy counter is φ, the mode mode F and original sensor off F are reset to stop displaying the ``-'' at the 10th position on the display.

The automatic document feeder 1 can be set to pressure plate mode or
It can be set to either SADF mode or ADF mode, and normally originals are set and copied in the same way as before. In other words, in the pressure plate mode, the automatic document feeder does not operate and is used as a pressure plate.
When the print switch is turned on, the main unit copies the set number of copies of the original at the exposure position and then stops. In SADF mode, the originals are set one by one on the original table 3,
The document is conveyed to the exposure position by the automatic document feeder, and the main body 2 copies a set number of copies.
In the ADF mode, when a desired number of originals are set on the original table 3 and the print switch is turned on, the originals are sequentially set at the exposure position by the automatic document feeder 1, and the set number of originals are copied by the main body 2. Therefore, modoshi mode is generally
This occurs when performing one-to-one copying in SADF mode or ADF mode. When the mode is set, as is clear from the above explanation, if the document set sensor 4 is turned on from off even once, that is, if the document to be recopied is set on the document table 3, before the transfer paper jam occurs in the main body. In the original transport mode, the original on the original placing table 3 is set at the exposure position. Furthermore, if the document set sensor 4 does not turn off even once after entering the mode mode, the document sensor off F remains at 0, so as is clear from FIG. 5, the paper feed JOB counter does not advance and the document is not fed. Instead, it becomes pressure plate mode.

In the above embodiment, the SADF mode may be omitted and the automatic document feeder 1 may be used in either the ADF mode or the pressure plate mode.

(Effects) As described above, according to the present invention, when a document that needs to be recopied is set on the document tray, that is,
If the print switch is turned on after the document set sensor has been turned off after being turned off at least once, the copy operation will be performed in ADF mode, ensuring that the document that needs to be recopied is placed in the ADF.
You can copy in mode.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a part of an embodiment of the present invention, Fig. 2 is a block diagram showing a control circuit of the embodiment, and Figs. 3 to 12 are part of the main routine of the embodiment. and a flowchart showing each part thereof. 1...Automatic document feeder, 3...Document placement table,
4... Original set sensor, 7... Pull-out roller, 8... Conveyance belt, 14... Microcomputer.

Claims (1)

[Scope of Claims] 1. A document placement table for placing an original document; a document set sensor for detecting the document placed on the document placement table; and a document set sensor for detecting the document placed on the document placement table; an automatic document feeder comprising: a document transport device that transports the document toward an exposure position; and a document discharge device that sets the document transported by the document transport device at the exposure position and discharges the document after the exposure is completed; and a copying operation is started. a print switch that instructs to print the paper, and a detection means that detects that the transfer paper is jammed, and when the document is detected by the document set sensor and the print switch is turned on,
In a copying machine with an automatic document feeder having an automatic document feed mode in which a document placed on the document placement table is set by the automatic document feeder at an exposure position and a copying operation is performed after the setting, the copying machine is configured to perform a copying operation by the detection means. determining means for determining, when a paper jam is detected, that ejection of the transfer paper corresponding to the original ejected from the exposure position has not been completed; When it is determined that paper ejection has not been completed, the document set sensor
If the print switch is turned on without being turned off at least once, the automatic document transport mode is prohibited and the copying operation is executed, and the print switch is turned on after the document set sensor has been turned off at least once. 1. A copying machine with an automatic document feeder, comprising: control means for activating the automatic document feed mode to execute a copying operation when the automatic document feed mode is turned on.