JP2816234B2 - Automatic document feeder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic document feeder, and more particularly, to an automatic document feeder capable of using computer paper as a document.

2. Description of the Related Art As the operation of an image forming apparatus such as a copying machine is accelerated and automated, an automatic document feeder that automatically and quickly inputs a document to the image forming apparatus is required. This automatic document feeder performs an operation of feeding a document of various sizes, types, materials, or weights to a predetermined position on a platen without causing a jam or damage, and after reading the document, feeding the document from the platen. Is required.

In this case, computer paper (hereinafter referred to as CF paper) poses a problem because it is different from a normal document. However, this CF paper is elongated and has sprocket holes formed at both edges, and is folded in a zigzag or fan shape. ing.

Japanese Patent Application Laid-Open No. Sho 59-72456 discloses a document moving device capable of automatically feeding such a CF sheet as well. According to the document moving device disclosed in this publication, CF
The sheet can be sent to a predetermined position on the platen with high positioning accuracy, and can be sent out from the platen after reading the document.

[Problems to be Solved by the Invention] The above-described conventional document moving device is configured to use a aligning means for aligning CF paper on a platen at right angles to a feeding direction without using a sprocket hole, and extending the CF paper on the platen in the feeding direction. An existing lateral platen aligning end, a first frictional feeding means for frictionally pushing the CF sheet in a lateral direction with respect to the aligning end, and a downstream side of the platen.
A second friction feed means for applying a rotational force to the CF paper and pushing it to the alignment end is provided, so that the structure becomes complicated and the whole becomes large.

Also, there is carbon CF paper as a special CF paper. In this carbon CF paper, crimping holes for spelling are formed between adjacent sprocket holes at regular intervals.

In the document moving device according to the above-mentioned publication, an opening such as a caulking hole existing between sprocket holes is not erroneously detected.
A fairly complicated method is used in which the sprocket holes are determined in each zone. However, in this method, in very rare cases, an opening existing between sprocket holes may be erroneously detected.

An object of the present invention is to feed CF paper to a predetermined position on a platen with a simple structure without causing jam or damage,
An object of the present invention is to provide an automatic document feeder capable of feeding a document from a platen after reading the document.

[Means for Solving the Problems] An object of the present invention is to detect a paper feed port into which a CF sheet from which a document is to be read is inserted and a sprocket hole of the CF sheet, and use the detection pulse to convey and transport the CF sheet. For an automatic document feeder equipped with control means for controlling the stop, the condition for detecting the sprocket holes for jam detection by the control means is determined by the slip between the start and the conveyance of CF paper. Considering the state of occurrence of slippage, set the slip to a different value that does not erroneously determine that a jam has occurred, and set the time when the CF paper is transported by the transport member and when the paper is transported by the document discharge member. This is achieved by taking into account the state of occurrence of both slips and setting the slips to different values without erroneously determining a jam.

[Operation] According to the above configuration, the count number (time) required for detecting the adjacent sprocket hole necessary for determining that the jam has occurred in the control means is stable at the start of the CF paper conveyance. The count number (time) is set to a higher value when the CF sheet is transported by the transport member facing the platen than when discharged by the discharge member.

For this reason, CF paper that is prone to slip at the start of transport is automatically fed without detection of erroneous jams, or CF paper that is more likely to slip during transport by the transport member than when discharged by the document discharge member is erroneously jammed. Automatically sent without detection.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

First, a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is an explanatory view of a copying machine according to an embodiment of the present invention, in which 1 is a copying machine main body, 2 is a paper feeding unit,
Reference numeral 3 denotes a sorter unit, and 4 denotes an automatic document feeder (hereinafter, referred to as ADF).

As shown in FIG. 1, an ADF 4 is provided on the upper part of the copying machine main body 1, and a paper feeding unit 2 and a sorter unit 3 are arranged on both sides of the copying machine main body 1, respectively. Further, an optical system unit 5 is provided in the copying machine main body 1 immediately below the ADF 4, an image forming unit 6 is provided below the optical system unit 5, and a transfer paper storage unit 7 is provided below the copying machine main body 1. ing.

FIG. 2 is an explanatory view of a main part of an embodiment of the present invention, in which 29 is a document set table, 31 is a call roller, and 23 is
A CF paper feed port, 21 is a CF hole detection sensor, 22 is a CF paper detection sensor, 24 is a CF hole detection sensor, and 10 is a document transport belt.

As shown in FIG. 1, the ADF 4 includes a paper feed unit 4a, a transport unit 4b, and a reverse discharge unit 4c. A document set table 29 is provided in the paper feeding section 4a, and the entrance guide mylar 8 is arranged continuously to the document set table 29. In the entrance guide mylar 8, there is a call roller 31, which conveys a document,
A separation roller 25, a driving roller 28, a driven roller 27, a separation blade 26, and a document set sensor 20 are provided.

A CF paper feed port 23 is formed at the end of the transport guide 4b side of the entrance guide mylar 8, and CF hole detection sensors 21 and 24 and a CF paper detection sensor 22 are disposed near the CF paper feed port 23. Have been.

On the platen 32, a transport section 4b composed of a document transport belt 10 and a press roller 15 is formed on the platen 32 so as to be continuous with the paper feed section 4a, and a turn roller 11 is provided near the end of the transport section 4b on the side of the reverse discharge section 4c. Is provided.

These turn roller 11, intermediate transport roller 13, reversing drive roller 14, switching claw 12, paper discharge roller 16, and neutralizing brush 19
The reverse discharge section 4c is formed by the above-described steps, and the reverse discharge section 4c is formed.
Are provided with a reversal registration sensor 9, a reversal entrance sensor 18 and a paper discharge sensor 17.

A normal original is set on the original set table 29 so that the leading end of the original turns on the original set sensor 20 (SN1). When the original set sensor 20 (SN1) is turned on, the apparatus is in a copyable state.

When the print switch of the copier is operated in this state,
The ADF 4 starts a paper feeding operation based on a paper feeding command from the copying machine.

The document on the document set table 29 is transported to the transport section 4b by the rotation of the recall roller 31, and the separation roller 25 and the separation blade 26 are operated, so that only the lowest one document is removed.
The paper is fed to the positions of the driven roller 27 and the driving roller 28, and is transported by these rollers onto the document transport belt 10 which has already started moving.

After the rear end of the original placed and transported on the original transport belt 10 has passed the original size sensor 30 and moved a predetermined distance, the original transport belt 10 stops. At this stop position, the conveyance control is performed so that the rear end of the document coincides with the reference position S in FIG.

When the document stops at a predetermined position on the platen 32 in this manner, the document is read by the optical system unit 5 shown in FIG. 1, and a latent image of the document is formed on the photosensitive member of the image forming unit 6.
The latent image is visualized by a developing device, and the visualized image is transferred to a transfer paper supplied from a transfer paper storage unit 7 or a paper supply unit 2 to make a predetermined number of copies and sent to a sorter unit 3. And sort them out.

The transfer paper is supplied from the paper supply unit 7 when a large number of copies are made at one time.

When the predetermined number of copies have been completed, the copying machine issues a command to feed the next document to the ADF 4, and at the same time transmits a command to the ADF 4 to discharge the already copied document. In this case, in order to improve the copying efficiency, a method of starting the feeding of the next original before finishing the copying of the previous original and then discharging the previous original is adopted.

Therefore, when the next document stops on the platen 32,
A part of the previous document is on the document transport belt 10, but is driven by the intermediate transport roller 13 and discharged without stopping.

When copying CF paper, insert the leading end of the CF paper through the CF paper feed port 23, position the first page of CF paper on the platen 32, and make sure that the fold of the CF paper is , And the second and subsequent pages of the CF paper are placed on the original set table 29.

When the print switch of the copier is operated in this state,
The reading and copying of the first page of CF paper on the platen 32 are performed. Next, the CF paper from the second page onward is detected by the CF paper detection sensor 22 (SN7).
After the sprocket holes are detected in 1, 24, they are fed to the document conveying belt 10 of the conveying section 4b, and reading and copying of the second and subsequent pages are performed after the first page.

In this case, the CF paper is fed into the transport unit 4b along a guide plate provided continuously to the CF paper feed port 23 without entering a skew state.

FIGS. 3 (a) and (b) and FIGS. 4 (a) and (b)
FIG. 3 is an explanatory diagram showing a setting state of CF paper on a platen and an obtained copy image in the embodiment.

As shown in FIG. 3A, the original reference S on the platen
When copying is performed by setting the folds 34 of the CF paper 35 in accordance with FIG. 2 (FIG. 2), a copy image as shown in FIG. 2B is obtained.

As shown in FIG. 4 (a), when the print position is shifted from the fold 34 of the CF paper 35, the position where the fold should exist between the print positions is determined based on the document reference S on the platen. By setting them in agreement, a copy 36 as shown in FIG.

FIG. 5 is a block diagram showing a control system according to the present embodiment, in which 38 is a CPU, 39 is an input buffer, 40a to 40c are servo circuits, 41 is a driver circuit, M1 is a paper feeder driving motor, and M2 is a document. The transport belt drive motor M3 is a reverse discharge section drive motor.

As shown in the figure, the CPU installed in the copier and ADF
38 are connected to enable serial communication, and the original set sensor
20 (SN1), original size sensor 30 (SN2), reversal registration sensor 9 (SN3), paper ejection sensor 17 (SN4), reversal entrance sensor 18 (SN5), CF hole detection sensor 21 (SN6), CF paper detection sensor 22 (SN7), CF hole detection sensor 24 (SN8) and variable resistors 47a and 47b are connected to an input buffer 39, and an output terminal of the input buffer 39 is connected to a CPU 38.

Servo circuits 40a, 40b, and 40c are connected to the CPU 38, and the CPU 3
From 8, an ON / OFF command, a speed command, and a forward / reverse command are input to the servo circuits 40a, 40b, 40c. Further, the feeder drive motor M1 and an encoder 42b coaxially arranged with the feeder drive motor M1 are connected to the servo circuit 40a.

Similarly, the servo circuit 40b is connected to a document conveying belt driving motor M2 and an encoder 43b arranged coaxially with the document conveying belt driving motor M2, and the servo circuit 40c is connected to a reverse discharge unit driving motor M3. An encoder 44b coaxially arranged with the reverse discharge unit driving motor M3 is connected.

Also, pulse information is input from the encoder 42b to the servo circuit 40a and the CPU 38, pulse information is input from the encoder 43b to the servo circuit 40b and the CPU 38, and pulse information is input from the encoder 44b to the servo circuit 40c. Input to CPU38.

A driver circuit 41 is connected to the CPU 38, and a solenoid and a display are connected to the driver circuit 41.

The servo circuits 40a, 40b, 40c
ON / O from CPU38 based on pulse information from b, 43b, 44b
The FF command, the speed command, and the forward / reverse command are configured to control the driving of the paper feed unit drive motor M1, the original transport belt drive motor M2, and the reverse discharge unit drive motor M3, respectively. The pulse information input from the encoders 42b, 43b, and 44b to the CPU 38 is mainly used for controlling the position of a document and detecting abnormality of each motor.

The variable resistors 47a and 47b are provided for adjusting the stop position of the document, and the resistance values set by the variable resistors 47a and 47b are:
The signals are input to the CPU 38 via analog ports AN1 and AN2 (for example, an NEC μPD7810 is used). For example, if the number of stop pulses from the passage of the original through the original size sensor 30 to the original reference S is 640, the variable resistor 47a can be adjusted so that the number of pulses is equal to the number of pulses, and the variation in the apparatus can be corrected. , In this case on software
The adjustment can be performed as 600+ (analog value of the variable resistor 47a).

In this embodiment, the count up is performed about every 3 msec,
CFFJMT (Jam timer) which is reset when the hole detection sensor detects the bracket hole of CF paper,
If the CFFJMT counts beyond a predetermined value, it is determined that a jam has occurred on the CF sheet.

In this embodiment, when the CF sheet is started to be conveyed, when the sheet is conveyed, when the CF sheet is conveyed by the document conveying belt 10 that is a conveying member, and when the CF sheet is discharged over the discharge roller 16 that is a document discharging member. At the time of transport, the count number of CFFJMT set for the jam determination is selected to be a different value.

Next, the feeding operation of the CF sheet according to the embodiment will be described with reference to a flowchart.

FIG. 6A is a flowchart showing a CFF mode check routine of this embodiment. In this routine, a check is made as to whether or not to enter the CF mode.

In the figure, in step S1, the CF paper detection sensor 22 (SN
7) is ON, that is, the CF paper is
It is determined whether or not the setting has been made by inserting. If it is determined in step S2 that the ADF is not operating,
Proceed to step S3 to turn off document set sensor 20 (SN1)
Thus, it is confirmed that a normal document is not set on the document set table 6.

In this way, after the normal document is given priority and it is confirmed that the normal document has not been set, in step S4, the ADF transmits information indicating the presence of the document to the copying machine. When the copy switch is operated from the copying machine based on this information, a document feed command is transmitted to the ADF.

In the case of a normal document, the ADF starts the paper feeding operation by this paper feed command.
In step S6, a CF paper size signal is transmitted to the copying machine, and the CFF mode flag is set. The size signal is used as information on automatic paper selection and automatic scaling of the copying machine.

At step S7, it is determined whether or not the CFF mode flag is 1, and if the determination is YES, the C
After the irradiation (exposure) of the light onto the F paper, a discharge command for the copied document is transmitted from the copying machine to the ADF. In step S8, it is determined whether or not this paper ejection command has been received.
If the determination in S8 is YES, CFFJBC (C
FF operation counter) is set to 1.

FIG. 6B is a flowchart showing a CFF pulse check routine 1 of the present embodiment. In this routine, a sprocket hole of CF paper is detected, the number is counted by CFFCNT, and a timer CFFJMT for the jam check of CF paper. Timer CFTM1 that clears the timer and counts 1 every 1 msec
Or to clear. These processes are performed at the edge of the sprocket hole where the hole is detected from the holeless state of the CF paper.

At step S11, it is determined whether or not the CFF mode flag is 1, and if this determination is YES, the routine timer CFTM1 is counted at step S12, and the routine proceeds to step S12.
Proceeding to 13, it is determined whether the CF hole detection sensor 21 (SN6) is ON.

If the determination in step S13 is YES, the process proceeds to step S14 to determine whether or not CFFEGF1 is 0. If the determination in step S13 is NO, CFFEGF1 is set to 0 in step S15.

If the determination in step S14 is YES, in step S16 CFF
EGF1 is set to 1, and the process proceeds to step S17 to determine whether CFTM1F is 1. If the determination in step S17 is NO, CFTM1F is set to 1 in step S18, and the process proceeds to step S20. If the determination in step S17 is YES, step S19
After confirming that CFTM1 has reached 24 counts,
Proceed to step S20.

As described above, since CFTM1 is counted once every 1 msec, holes in the CF paper are counted with a time interval of 24 msec or more, and detection other than the regular hole interval is not performed.

In step S20, CFTM1 is cleared, CFFCNT is counted, and CFFJMT is cleared.

FIG. 6C is a flow chart showing the CFF pulse check routine 2 of the present embodiment, in which the CF hole detection sensor 24 (SN
8) is used, and an operation similar to that of FIG. 6B is performed.

At step S21, it is determined whether or not the CFF mode flag is 1. If the determination is YES, the routine timer CFTM2 is counted by 1 at step S22, and the routine proceeds to step S23, at which the CF hole detection sensor 24 (SN8) is executed. Is determined whether is ON.

If the determination in step S23 is YES, the process proceeds to step S24 to determine whether CFFEGF2 is 0. If the determination in step S23 is NO, CFFEGF2 is set to 0 in step S25.

If the determination in step S24 is YES, in step S26 CFF
EGF2 is set to 1, and the process proceeds to step S27 to determine whether CFTM2F is 1. If the determination in step S27 is NO, CFTM2F is set to 1 in step S28, and the process proceeds to step S30. If the determination in step S27 is YES, step S29
After confirming that CFTM2 has reached 24 counts,
Proceed to step S30.

Also in this case, the hole count of the CF paper is performed with a time interval of 24 msec or more, and no detection other than the regular hole interval is performed.

In step S30, CFTM2 is cleared and CFFCNT is counted.

FIG. 6D is a flow chart showing the CFF pulse check routine of the present embodiment, in which the CF hole detection sensor 21 (SN6) is used.
Are used, and an operation similar to that of FIG. 6B is performed.

At step S31, it is determined whether or not the CFF mode flag is 1, and if this determination is YES, the routine timer CFTM3 is counted by 1 at step S32, and the routine proceeds to step S33, at which the CF hole detection sensor 21 (SN6) is operated. Is determined whether or not is OFF.

If the determination in step S33 is YES, the process proceeds to step S34 to determine whether or not CFFEGF3 is 0. If the determination in step S33 is NO, CFFEGF3 is set to 0 in step S35.

If the determination in step S34 is YES, CFF is set in step S36.
EGF3 is set to "1", and the flow advances to step S37 to determine whether CFTM3F is "1". If the determination in step S37 is NO, CFTM3F is set to 1 in step S38, and the process proceeds to step S40. If the determination in step S38 is YES, step S39
After confirming that CFTM3 has reached 24 counts,
Proceed to step S40.

In this way, the counting of holes in the CF paper is performed with a time interval of 24 msec or more, and no detection other than the regular hole interval is performed.

In step S40, CFTM3 is cleared and CFFCNT is counted.

Thus, in the CFF pulse check routine 1 shown in FIG. 6B and the CFF pulse check routine 2 shown in FIG. 6C, the CF hole detection sensor 21 (SN6)
In the CFF pulse check routine 3 of FIG. 6D, the check of the CF hole detection sensor 24 (SN8) is performed.
Each hole counts one pulse. Therefore, in the CFFCNT which counts these pulses, three counts are performed for one sprocket hole of CF paper.

FIGS. 7A to 7G are flow charts showing the CF sheet conveying operation of the present embodiment.

As described above, in this embodiment, the CFFJMT (jam timer) is used, and the count number of the CFFJMT is cleared each time a hole in the CF paper is detected. If is not cleared,
It is determined that a jam has occurred.

In this case, the CF paper is relatively slipped because the first page of the CF paper is conveyed only by the conveyance force of the document conveyance belt 10 until the driving force of the intermediate conveyance roller 13 and the discharge roller 16 is obtained. Easy to do.

In addition, when the CF paper starts to be transported and when it is being transported in a steady state, a slip is more likely to occur at the start of transport than at the time of steady transport.

Therefore, in this embodiment, the CF sheet is conveyed by the intermediate conveyance roller 13 and the paper discharge roller 16 when the CF sheet is conveyed only by the document conveyance belt 10 in the predetermined count number for the above-described jam determination. Is set higher than when Similarly, the predetermined count number for the jam determination is set to be higher when the CF paper starts to be transported than when it is transported in a steady state.

Even if a slip occurs, the stop position of the CF sheet is controlled so as to be at a predetermined position, so that there is no problem even if the slip occurs within a time sufficient for exposure of the copying machine. Rather, it is more problematic to set the predetermined count for the above-described jam determination low and determine the slip as a jam.

For this reason, in this embodiment, in each case, a predetermined count number for the jam determination is set based on the actual measurement data, and the slip is not erroneously determined as a jam.
The occurrence of jams is detected accurately and promptly to protect CF paper.

As already described with reference to the flowchart of FIG. 6 (a), when a paper ejection command is received, CFFJBC is set to 1, but the number of CFFJBC sets changes in the course of the CF paper transport operation. The corresponding operation is performed.

FIG. 7A is a flowchart of the CFJOB routine of this embodiment. In step S50, the number of CFFJBC sets is determined, and a multi-jump is performed in accordance with the set number.

FIG. 7B is a flow chart of the CFJB1 routine of this embodiment. If the number of CFFJBC is determined to be 1, the processing in this flow chart is performed, and in step S51, the document conveying belt driving motor M2 is set. Then, the speed command of the reverse discharge unit driving motor M3 is set to the high speed command, and the original conveying belt driving motor M2 and the reverse discharge unit driving motor M3 are turned on, and CFFCNT is simultaneously cleared. Next, CFFJBC is set to 2 and flags CFTM1F to CFTM3F are reset. These flags are used in the CFF pulse check routines 1 to 3 already described, and are set when the first CF paper hole is detected and used to start CFTM1 to CFTM3.

FIG. 7C is a flowchart of the CFJB2 routine and the CFJB3 routine of this embodiment. When the number of CFFJBC is determined to be 2, the operation of the flowchart is performed. In step S52, CFFJMT is incremented each time this routine is entered. As already mentioned, CFFJMT is
This counter is cleared each time a hole in the CF sheet is detected in the pulse check routine 1, and determines that a jam has occurred if the hole is not cleared even if it exceeds a predetermined count.

Next, proceeding to step S53, the CF paper detection sensor 22 (S
It is determined whether or not N7) is OFF, and step S53 is performed.
If the determination is NO and there is a CF sheet, the flow advances to step S55 to determine whether or not CFFCNT has reached 56 counts.

If the determination in step S55 is NO, the process proceeds to step S61 to determine whether or not the sheet discharge sensor 17 (SN4) is OFF. If the determination in step S61 is YES and the CF sheet is not in the discharged state yet, it is determined in step S62 whether or not the CFFJMT has reached 100 counts.

If the determination in step S62 is YES, it is determined that a jam has occurred, and the process proceeds to step S62, where the original transport belt drive motor M2 and the reverse discharge unit drive motor M3 are turned off, the JAM flag is set, and the transport of CF paper is stopped. Is done.

If the determination in step S61 is NO, the process proceeds to step S64 to determine whether or not CFFCNT is 9 counts or less.If the determination in step S64 is YES, CFFJMT is increased to 60 counts in step S65. It is determined whether or not it has reached, and if the determination in step S65 is YES, it is determined that a jam has occurred, and the flow proceeds to step S63.

If the determination in step S64 is NO, the process proceeds to step S66 to determine whether or not CFFJMT has reached 30 counts. If the determination in step S66 is YES, it is determined that a jam has occurred, and the process proceeds to step S63.

As described above, when the CF paper is being conveyed only by the document conveying belt 10 and the paper discharge sensor 17 (SN4) is OFF, the CF paper is being conveyed by the intermediate conveyance roller 13 and the paper discharge roller 16 and the discharge sensor When 17 (SN4) is ON, it is judged as a jam C
The predetermined count number of the FFJMT is set to a different value so that a slip is not erroneously detected as a jam.

In addition, at the time of conveyance by the intermediate conveyance roller 13 and the paper ejection roller 16, the predetermined count number of CFFJMT for judging a jam is set to a different value between the time of conveyance start and the time of normal conveyance in which the conveyance is stable. A slip that is likely to occur is prevented from being erroneously detected as a jam.

Returning to FIG. 7 (c), if the determination in step S53 is YES, the process proceeds to step S54 where M3TPC is cleared and CFFJBC
Is set to 5. If the determination in step S55 is YES
When the CFFCNT reaches 56 counts without occurrence of a jam, the flow advances to step S56 to move the original conveying belt driving motor M2.
And the reverse discharge unit drive motor M3 is set to low speed and CF
The stopping accuracy of the paper is improved, and CFFJBC is set to 3.

When CFFJBC is set to 3, go to step S57
FFJMT is incremented each time this routine is entered, and the process proceeds to step S58 where the CF paper detection sensor 22 (SN7)
It is determined whether it is OFF.

If the determination in step S58 is YES, the process proceeds to step S54, where the processing described above is performed, and the determination in step S58 is N.
If it is O, the flow advances to step S59 to determine whether or not CFFCNT has reached 66 counts.

If the determination in step S59 is YES, the process proceeds to step S60, where the brakes are applied to the original conveying belt driving motor M2 and the reverse discharge unit driving motor M3, and 4 is set in CFFJBC. If the determination in step S59 is NO, the process proceeds to step S61, and the operation already described below in the CFJB2 routine is performed.

FIG. 7D is a flowchart of the CFJB4 routine of this embodiment. When the number of CFFJBC is set to 4 in step S60 described above, the document conveying belt drive motor M2 and the reverse discharge unit are set in step S67. The drive motor M3 is turned off and CFFJBC is cleared.

FIG. 7E is a flowchart of the CFJB5 routine of this embodiment. If the number of CFFJBC is set to 4 in step S54 described above, it is determined in step S68 whether M3TPC has reached 44 counts. This judgment is YE
If the answer is S, the flow advances to step S69 to rapidly apply a brake to the original conveying belt drive motor M2 and the reverse discharge unit drive motor M3, stop these motors, and set CFFJBC to 6. Next, the process proceeds to step S70, where the absence of the original is transmitted to the copying machine to notify that it is the final original.

FIG. 7 (f) is a flowchart of the CFJB6 routine of this embodiment. If CFFJBC is set to 6 in step S69 described above, it is determined in step S71 whether or not there is a paper ejection command from the copying machine. If the determination is YES, the process advances to step S72 to drive the original conveying belt driving motor M2 and the reverse discharge unit driving motor M3 at high speed to discharge CF paper. At the same time, CFFDTM is cleared in step S72, and CFFJBC is set to 7.

FIG. 7 (g) is a flowchart of the CFJB7 routine of this embodiment. When CFFJBC is set to 7 in step S72 described above, it is determined in step S73 whether CFEDTM has timed out, and step S73 is performed. Is YES
In step S74, the process proceeds to step S74, where the original conveying belt driving motor M2 and the reverse discharge unit driving motor M3 are turned off. At the same time, in step S74, the CFF mode flag is reset, CFFJBC is cleared, and a series of CF modes ends.

As a whole operation, when CF paper is continuously copied, the CFFJBO routine to CFFJB4 routine are repeated, and the CFFJBO routine, CFFJB1 routine,
In the CFFJB2 routine, the processes of the CFFJB5 to CFFJB7 routines are performed.

In this embodiment, even when the operator mistakenly selects the one-sided original-two-sided copy mode and selects the two-sided original-two-sided copy mode when attempting to copy the CF paper on both sides, the two-sided copy is not performed. It is desirable to make it possible. In this case, both the document reversal command and the reversal discharge command may be checked on the flowchart instead of step S8 in FIG. 6 (a).

As described above, according to the present embodiment, the predetermined count number for the jam determination is conveyed by the intermediate conveyance roller 13 and the discharge roller 16 when the CF sheet is conveyed only by the document conveyance belt 10. To a higher value than
By setting a higher value at the start of sheet conveyance than at the time of normal conveyance in which the conveyance is in a stable state, the slip is not erroneously determined as a jam.

For this reason, according to the present embodiment, the jam is accurately determined without malfunction, and the conveyance of the CF paper is stopped, so that the CF paper is protected and the CF paper is efficiently transported.

In addition, by selecting a predetermined count number for jam determination according to the characteristics of CF paper to an optimum value,
Jam detection can be performed on CF paper in the shortest time.

 Next, a second embodiment will be described.

In the second embodiment, a carbon CF sheet is used as an original. When the CF hole detecting sensors 21 and 24 shown in FIG. 2 detect a sprocket hole of the CF sheet, the prohibiting means performs the next detection for a predetermined period. Is configured to be prohibited. The configuration of the other parts of this embodiment is the same as that of the first embodiment already described with reference to FIGS.

FIGS. 8 (a) to 8 (f) are diagrams for explaining the operation of detecting sprocket holes in CF paper in this embodiment. As shown in FIG. 8 (a), sprocket holes 35a and caulking holes 35b are formed in carbon CF paper 35K. Are provided.

When transporting such carbon CF paper 35K, the sixth
In the operation described with reference to FIGS. 8B to 8D, the CF hole detection sensors 21 (SN6) and 24 (SN8) have the detection prohibition range for a certain time after the CF hole is detected by the prohibition means, as shown in FIG. ) To (f), the caulking hole 35b is not erroneously detected.

The operation of the other parts in this embodiment is the same as that of the first embodiment already described with reference to FIGS.

In the second embodiment, the CF hole detection sensors 21 (SN6), 24
In (SN8), a detection prohibition range is set for a certain time after the sprocket hole detection of CF paper.
The caulking hole 35b of CF paper is not erroneously detected as a sprocket hole.
Any type of document is transported accurately.

Therefore, according to this embodiment, there is no erroneous detection of sprocket holes when CF paper is used, and the conveyance is controlled by judging the jam accurately, so that the CF paper is protected and efficient document feeding is performed. Is performed.

In addition, by selecting a predetermined count number for jam determination according to the characteristics of CF paper to an optimum value, each CF
Jam detection can be performed on a sheet in the shortest time.

In the present embodiment, the detection prohibition range for a fixed time after the sprocket hole detection of the CF paper is performed by using the timer, but may be performed by an encoder or the like (for example, M3 timing pulse) attached to the drive system. .

[Effect of the Invention] As described above, according to the first aspect of the present invention,
The sprocket hole detection condition of CF paper for jam determination can be set to an appropriate value for jam detection even in situations where the slip amount is different. If they are different, erroneous detection due to slippage that is likely to occur at the start of conveyance of CF paper is prevented,
The conveyance of the CF paper is stopped by detecting the jam accurately and quickly, and the CF paper can be efficiently conveyed while being protected.

According to the second aspect of the present invention, the condition for detecting the sprocket hole of the CF paper for the jam determination is determined when the CF paper is transported only by the transport member and when the document discharge member is operated and transported. This makes it possible to prevent erroneous detection due to slip, which is likely to occur when the CF paper is conveyed only by the conveying member, and to accurately and quickly detect jams and reduce CF
By stopping the paper transport, it is possible to transport the CF paper efficiently while protecting it.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a copying machine to which the present invention is applied, FIG. 2 is an explanatory view of a main part of FIG. 1, and FIGS. FIG. 5 is a block diagram showing a circuit configuration, and FIG. 6 is a CFF.
FIG. 7 is a flow chart showing a mode check routine and an FF pulse check routine, FIG. 7 is a flow chart of a CF paper transport operation, and FIG. 8 is an explanatory diagram of a sprocket hole detection operation of the CF paper. DESCRIPTION OF SYMBOLS 1 ... Copier main body, 2 ... Paper feeding unit, 3 ... Sorter part, 4 ... ADF, 5 ... Optical system part, 6 ... Image forming part
8 Entry guide mylar, 9 Reverse registration sensor (SN3), 10 Document transport belt, 11 Turn roller, 12 Switching claw, 13 Intermediate transport roller, 14 Reverse drive roller 16: paper discharge roller, 17: paper discharge sensor (SN
4), 18 ... Reversing entrance sensor (SN5), 20 ... Document set sensor (SN1), 21 ... CF hole detection sensor (SN6), 22 ...
CF paper detection sensor (SN7), 23 ... CF paper feed port, 24 ...
… CF hole detection sensor (SN8), 25 …… Separation roller, 26 ……
Separating blade, 27 ... driven roller, 28 ... driving roller,
29: Original set table, 30: Original size sensor (SN2), 31: Retrieval roller, 38: CPU, 39: Input buffer, M1: Feeding section drive motor, M2: Original transport belt drive Motor, M3 ... Reversing discharge unit drive motor, 40a, 40
b, 40c: Servo circuit, 41: Driver circuit, 42a, 43b, 4
4b …… Encoder.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B65H 7/06 B65H 26/02 G03G 15/00 526

Claims (2)

(57) [Claims] An original is fed to a platen, placed on the platen, irradiated with light, the original is read, and the read original is placed on the platen by a transport member provided opposite the platen. In the automatic document feeder that transports the document and further feeds it from the platen by the document discharge member, a paper feed port into which computer paper to be read as a document is inserted, and a sprocket hole of the computer paper are detected, and the detection pulse Control means for controlling the conveyance and stop of the computer paper, and the detection condition of the sprocket hole for the jam detection of the control means, at the start of the conveyance of the computer paper and during the conveyance, Taking into account the state of occurrence of slip, set each value to a different value so that slip is not misjudged as a jam An automatic document feeder characterized in that: 2. The method according to claim 1, wherein the detecting conditions include a state in which the computer paper is conveyed by the conveying member and a state in which the computer paper is discharged and conveyed while being applied to the document discharging member. 2. The automatic document feeder according to claim 1, wherein the different values are set so as not to be erroneously determined.