JPH01172149A - Copying device - Google Patents

Abstract

PURPOSE:To prevent any misoperation in detecting paper jamming by displaying jamming by using jammed paper treating means when the count value reaches a predetermined value as well as once stopping a document carrying means, and at the same time momentarily interrupting the movement of jammed paper treating means. CONSTITUTION:When a document is inserted from the top of a guide plate 1 and its tip is detected by a sensor PS1, a carrying roller 10 is pressed on a roller 2 by a solenoid SL1 as well as a stopper 11 is retracted, and the document is selectively fed corresponding to its size through carrying rollers 2 to 7 and discharged onto a tray 8 after exposuring. On its way, the document is successively detected be sensors PS1 to PS4, and according to tile respective signals the pulses from the encorder 82 of a document carrying motor M1 are successively counted. When the value reaches a given value corresponding to the carrying route length or more, a jammed paper treating means displays the paper jamming and once stops the motor M1. At that time. the jammed paper treating means also momentarily stops to move. Thus, even when the document is once stopped in synchronizing with a copying paper, the misdetection of paper jamming can be prevented.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a paper jam detection mechanism for a copying device.

2. Description of the Related Art Conventionally, an automatic document circulation conveyance device that circulates the number of documents inserted from a document insertion section through a circulation conveyance path is disclosed in Japanese Patent Laid-Open No. 58-147762 and Japanese Patent Laid-Open No. 59-10.
Various types are available, such as those described in Japanese Patent No. 9066.

On the other hand, in order to detect a paper jam of a document, it is conceivable to use a paper jam detection device described in Japanese Patent Publication No. 56-28825, for example. Although this detection device is used for copying materials4, it can also be used for detecting paper jams in original documents. That is, when a plurality of original detection sensors installed in the original transport path and a counting means for counting the transport state of the original are combined, and when each sensor detects the original, the counting means is counting more than a predetermined count value. It is determined that a paper jam has occurred.

Problems to be Solved by the Invention The above-mentioned Japanese Patent Laid-Open No. 147762/1983
The automatic document circulation conveyance device described in Publication No. 1.09066 is configured to switch between multiple circulation paths in accordance with the length of the document to increase the copying speed and minimize damage to the document. Therefore, there is a demand for stricter document jam detection.

In this regard, if the paper jam detection device described in the above-mentioned Japanese Patent Publication No. 56-28825 uses clock pulses, the actual paper conveyance and the paper detection timing set in advance can be Errors will occur.

Furthermore, setting of the detection timing becomes complicated especially when the paper conveyance speed changes as in the case of enlarged/reduced copying.

However, when such a paper jam detection device is applied to the automatic document circulation conveyance device, there is a problem that a paper jam is determined even when the document is temporarily stopped for synchronization.

Means for Solving the Problems In order to solve the above problems, the copying apparatus according to the present invention includes: (1) a means for circularly transporting originals, and (11) a plurality of originals installed in the original transport path. (1) A means for counting the pulses; (V) When the count value of the counting means reaches a certain value, the original is transported. (vl) means for temporarily stopping the conveyance of the document midway through conveyance of the document; (vii) means for temporarily stopping the document by the stopping means; The present invention is characterized by comprising means for temporarily interrupting the operation of the paper jam handling means when the paper jam removal means occurs.

In other words, in the present invention, first, the document being conveyed two times λ on the circulation conveyance path is sequentially detected by the detection means, and the pulses synchronized with the conveyance of the document are counted by the counting means.

Then, the paper jam processing means determines that a paper jam has occurred when the count value of the counting means reaches a certain value, stops the document conveying means, and instructs to display the paper jam. - On the other hand, when the conveyance of the document is temporarily stopped for image synchronization with the copy paper, the operation of the paper jam removal means is temporarily interrupted. This prevents malfunction of paper jam detection. In other words, it is possible to temporarily stop the original between the original detecting means and synchronize it with the copy paper.

Embodiment Hereinafter, an embodiment of a copying apparatus according to the present invention will be described with reference to the accompanying drawings.

In this embodiment, as shown in FIG. 1, an automatic document circulation conveyance device is incorporated in the upper part of the main body of the copying machine. The automatic document circulation conveyance device generally includes a document insertion guide plate (1), document conveyance rollers (2) to (7), and a document output tray (8).
It is composed of.

There is a document conveyance roller (10) at the bottom of the document conveyance roller C).
is installed so that it can approach and separate, and this document transport roller (
10), a stopper (11) is installed so as to be rotatable about a support shaft (12). Conveyance roller (10
) and the stopper (11) are electrically operated by a solenoid (SLI), and normally the conveyance roller (10) is separated from the conveyance roller (2) and the stopper (1
1) has entered the document conveyance path shown by the dotted chain line (A) in FIG. On the other hand, when the solenoid (SLl) is turned on, the conveyance roller (1) comes into contact with the conveyance roller (2), the stopper (11) is retracted from the document conveyance path, and the document is ready to be conveyed.

Each of the conveyance rollers (2) to (6) and (7) can be rotationally driven in a counterclockwise direction and a clockwise direction by a conveyance motor (Ml), and driven rollers (3a) and (3b), respectively.
), (4a), (4b), (sa), (sb), (sa
), (6b), and (7a). Conveyance roller (4
), (5) are switching claws (15), (17) and a guide plate (16) for switching the circulation conveyance path.

(18), and the conveying roller (3) is provided with a switching claw (19) for switching between circulating and discharging the document, and a correction guide plate (31) for correcting skew.

Each switching claw (15), (17), (19) is a solenoid (SL2).

At (SL3) and (SL4), it is possible to move forward and backward into the document conveyance path.

That is, when the switching claw (15) is also entered with the switching claw (19) entered into the conveyance path, the document is circulated and conveyed between the transport rollers (3) and (4), and then the switching claw ( 1
7), the material is cyclically transported between the transport rollers (3) and (5), and when the switching claws (15) and (17) are retracted, the material is cyclically transported between the transport rollers (3) and (6). . On the other hand, when the switching claw (19) is retracted from the conveyance path, the document is discharged from the conveyance roller (7) onto the discharge tray (8).

In addition, a photo sensor (Ps
i), (PS2), (PS3), (PS4a), (PS
4b) and (PS5) are installed. Each sensor is located at the leading edge of the document.

The trailing edge is detected and used as a reference signal for the operation timing of the cutter (52), a reference signal for detecting the document length, a reference signal for paper jam detection, etc.

Next, the general structure of the copying machine main body will be explained.

The photosensitive drum (40) can be driven to rotate in the direction of arrow (a), and a charger (not shown) is arranged around it.

Known imaging elements such as a developing device are arranged.

The optical system (41) includes an exposure lamp (42) and a mirror (4).
3), (44), (45), lens (46)
, a mirror (47), and the transport roller (3
), (4) Shine light onto the document being conveyed on the glass (14) installed between
) is slit exposed.

Two types of copy paper (50) and (51) are set in roll form, and one of them is selectively fed to a cutter (52) and a pair of timing rollers (53) driven by a solenoid (SL5). ) to the transfer section (40a).

The copy paper on which the image has been transferred in the transfer section (40a) is conveyed as shown by the dotted chain line (B) in FIG.
), the toner is fixed on the upper ejection tray (5).
5) It is discharged to the top. In addition, a timing roller pair (53
) is installed a copy paper detection sensor (PS7).

Figure 3 shows the operation panel, (6o) is a copy start key, (61) to (70) are numeric keys for setting the number of copies, (71) is an interrupt key, (72) is a clear/stop key, (73) is a display section for displaying the number of copies and trouble codes such as paper jams.

(74) and (75) are image density up/down keys, and (76) is a group of display LEDs.

FIG. 4 shows the control circuit. A switch matrix (80) is connected to a microcomputer (CPU) for controlling the operation of the automatic document circulation conveyance device as well as the main body of the copying machine, and the display section (73) shows this matrix ( SO),
It is connected to (CPU) via a decoder (81). Further, a reset switch (R5W) installed in the switch matrix (8o) is a reset switch that is turned on when paper jam processing is completed.

Furthermore, a conveyance motor (Ml) for conveying a document, solenoids (SLl) to (SL5), etc. are connected to the output terminal of (CPU). The encoder (82) of the transport motor (Ml), each photo sensor, etc. are connected to the input terminal of the (CPU).

Here, the operation of the automatic document circulation conveyance device having the above configuration will be schematically explained together with the operation of the main body of the copying machine.

The main body of the copying machine starts a copying operation when a sensor (PSl) detects that the original is inserted from the guide plate (1).

That is, when a document is inserted along the guide plate (1) and its leading edge is detected by the sensor (Psi), the solenoid (SLI) is turned on and the conveyance roller (1o) is connected to the conveyance roller (2). At the same time as the pressure contact is made, the stopper (11) is retracted from the conveyance path, and the document is conveyed in the direction of the arrow in FIG. Ru. At this time, any roll-shaped copy paper (50) selected in advance.

(51) is fed, and when its leading edge is detected by the sensor (PS7), the feeding of the paper is temporarily stopped.

In this way, when both the original and the copy paper are waiting at a predetermined position, the original is conveyed, is irradiated with light from the optical system (41) on the glass (14), and the original image is transferred to the photoreceptor drum ( 40) as an electrostatic latent image, and is converted into a toner image by a developing device (not shown).

When a predetermined period of time has elapsed since the leading edge of the document was detected by the sensor (t's3), the timing roller pair (53) is driven, and the copy paper is transferred to the transfer section (4O) in synchronization with the toner image.
a).

Next, the operation of the automatic document circulation conveyance device will be explained with reference to the flowcharts shown in FIG. 5 and subsequent figures.

Figure 5 shows a microcomputer (200) (CPU)
The main routine is shown below.

When the (CPU) is reset and the program starts, the random access memory (
Clears RAM), initializes various registers, and performs initial settings to put each device in its initial mode. Next, in steps (S2) to (S6), each subroutine is called sequentially, and when the processing of all subroutines is completed,
After waiting for the routine timer to end in step (S7), the timer counter is incremented in step (S8), and the process returns to step (S2). The routine timer determines the time required for the main routine, and its value is determined by the step (
It is set in the initial setting of Sl) and serves as the reference for the timer used in each subroutine.

Furthermore, an interrupt request is made to the (CPU) for each signal from the encoder (82) of the transport motor (Ml), and when an interrupt occurs, the interrupt routine shown in FIG. 6 is processed. First, in step (S10) it is determined whether the motor (Ml) is ON or not. If it is OFF, the process returns as is; if it is ON, the pulse counter is incremented in step (So). Then, the distance or position of the document conveyed is detected based on the value of this pulse counter. Here, before incrementing the pulse, turn on the motor (Ml).
, OFF is checked in order to prevent malfunction due to lowering of the voltage generated at the encoder (82) section when the motor rotation is slow, resulting in noise.

FIG. 7 shows the copy start check subroutine executed in step (S2) of the main routine. This subroutine checks the start state of the copy operation and starts the copy operation when the conditions are met.

First, in step (550), the state counter (SC1) for start check is checked, and the following steps are executed according to the count value.

If the state counter (SC1) is 10", it is determined in step (551) whether the sensor (PS1) is on or not. If it is on, that is, the leading edge of the document is located at the sensor (
If detected at step (S52), 0.PSl) is detected.
Set a 5 sec timer (TA) and proceed to step (S5).
3) increments the state counter (SC1) and returns to the main routine.

If the state counter (scl) is incremented to whisper 1 in step (353), it is determined in step (554) whether the sensor (PS1) is on. If it is turned on, the timer (T
Waiting for the end of step A), the conveyance motor (Ml) is turned on in step (S56), and the solenoid (SLI) is turned on in order to press the insertion roller in step (S57).
L. In step (558), the state counter (SC2) for path switching processing and the state counter (SC3) for paper jam detection are set to -1.Secondly, step (558) is set to -1.
In step S59), the state counter (scl) is incremented and the process returns to the main routine.

Note that if the sensor (PSl) is not turned on, the determination in step (554) is NO, and the state counter (SC1) is reset to 10 in step (560).
Return to main routine.

In the step (S59), the state counter (SC1
) is incremented to °C "2", it is determined in step (561) whether the sensor (PSI) is turned off, and if it is turned off, that is, the trailing edge of the document is If it passes, the state counter (scl) is reset to "O" in step (562), and this subroutine ends.

FIGS. 8a to 8C show a subroutine for switching the document conveyance path to the shortest, middle, and longest paths depending on the length of the document.

First, in step (5100), the state counter (sc2) for conveyance path switching processing is checked, and the following steps are executed according to the count value.

If the state counter (SC2) is "0", the process returns to the main routine without performing the same process.

If the state counter (SC2) becomes 11 in step (558) of FIG.
1) Set the pass mode memory to initial mode. Then, the first flag is set to "1" in step (5102), the state counter (SC2) is incremented in step (5103), and the process returns to the main routine. When this first sheet flag is "1", it indicates that the document being conveyed is the first sheet that cannot be copied.

State counter (SC2) in step (5103)
is incremented to 12", wait for the sensor (PS2) to be turned on in step (5104), that is, when the leading edge of the document is detected by the sensor (PS2), step (5105) It is determined whether the sensor (PS7) is turned on or not. If the sensor (PS7) is turned on, that is, if the leading edge of the copy paper (50) or (51) is detected by the sensor (PS7), Step (S106)
Turn off the transport motor (Ml) and move the document to the sensor (PS2).
), the state counter (SC2) is incremented in step (5107), and the process returns to the main routine.

State counter (SC2) in step (5107)
If it is incremented to -3, it is determined in step (5108) whether the sensor (ps7) is on. If it is turned on, the transport motor (Ml) is turned on in step (5109), and it is determined in step (5110) whether or not the first sheet flag is "1". The first flag is “
1", that is, when copying the first sheet, the solenoid (SL2) is activated in step (5116).
, (SL3) is turned off, and step (5117)
Then, the state counter (sc2) is incremented and the process returns to the main routine.

On the other hand, when copying the second and subsequent sheets, the first sheet flag is "0".
[see step (5153)], the determination in step (Sho) is No, and the pass mode is checked in step (Sill) and (5114). Pass mode is set to step (511) when copying the first sheet.
8) Set as described below. If the path mode is set to the shortest mode, step (5112)
Turn on the solenoid (SL2) and move the original to the transport roller (
4) Prepare for circulation between
) to set the state counter (SC2) to 19 and return to the main routine. On the other hand, if the intermediate mode is set, the solenoid (SL3
) is turned on, the document is prepared to be circulated by the transport roller (5), and the process returns to the main routine via step (5113). Furthermore, if the longest mode is set, that is, the step (Sill).

If the determination at (51, 14) is NO, the process immediately returns to the main routine via step (5113). in this case,
The solenoids (SL2) and (SL3) remain off, and the document advances to the transport roller (6) and is circulated.

In the step (5117), the state counter (SC
2) is incremented to 64'', that is, when copying the first sheet, the document length is detected and the pass mode is set in the following steps.

First, in step (S1tS), wait until the sensor (PS3) is turned on, and in step (5119), add the number of pulses (CPA) to the current pulse counter value in the path length counter.
) is set. The number of pulses here (CPA
) is the number of pulses corresponding to the distance between the leading edge position of the document and the sensor (PS3) when the trailing edge of the document with the longest length that can be passed through the shortest path passes the sensor (PS1). Next, in step (5120), the state counter (
Increment SC2) and return to the main routine.

State counter (SC2) in step (5120)
is incremented and set to "5", in step (5121) it is determined whether the value of the path length counter set in step (5119) matches the value of the pulse counter. If it matches, step (
5122), it is determined whether the sensor (Psl) is off. If the sensor (PS1) is turned off, the document being conveyed is suitable for passing through the shortest path, so the solenoid (SL2) is turned on in step (5123). At the same time, the path mode is set to the shortest mode in step (5124), the state counter (SC2) is set to 'X9' in step (5125), and the process returns to the main routine.

If it is determined in the step (5122) that the sensor (PSl) is not turned off yet, step (5126)
Then, set the path length counter to the value obtained by adding the pulse count (CPB) to the pulse counter value at this time. The number of pulses (CPB) here refers to the position of the leading edge of the document and the number of pulses ( This is the number of pulses corresponding to the distance from the leading edge position of the document, which is the reference for CPA). Next, in step (5127), the number of pulses (CJI) is added to the paper jam detection counter. The number of pulses here (CJI) corresponds to the difference between the distance from the sensor (PS3) to (PS4a), (PS4b) when passing the intermediate path and the same distance when passing the shortest path. is the number of pulses.

Then, in step (5128), the state counter (
SC2) is incremented and the process returns to the main routine.

State counter (SC2) at step (5128)
is incremented and set to V''6〃, it is determined in step (5129) whether or not the value of the path length counter set in step (5126) matches the value of the pulse counter. If they match, it is determined in step (5130) whether or not the sensor (PSl) is off.If the sensor (PSl) is off, the document being transported is suitable for passing through the intermediate path. In step (3131), the solenoid (SL3) is turned on. At the same time, in step (5132), the nozzle mode is set to intermediate mode, and in step (5133), the state counter (SC2) is set to 59", and the process returns to the main routine. return.

If it is determined in the step (5130) that the sensor (PSl) is not turned off yet, step (5134)
Then, set the path length 6 counter to the value obtained by adding the pulse count (cpc) to the pulse counter value at this time. The number of pulses (CPC) here means that the trailing edge of the document passes the sensor (PSl), allowing it to pass through the longest path when copying the first sheet and passing through the intermediate path when copying the second and subsequent sheets. The number of pulses corresponds to the distance between the leading edge position of the original document and the leading edge position of the original document, which is the reference for the ζ pulse number (CPB). Next, in step (5135), the number of pulses (CJI) is added to the paper jam detection counter. The number of pulses (CJI) here refers to the sensor (PS3) to (ps4a), (PS4b) when the longest path is passed.
This is the number of pulses corresponding to the difference between the distance up to and the same distance when passing through the intermediate path.

Then, in step (5136), the state counter (
SC2) is incremented and the process returns to the main routine.

State fist counter (SC2) at step (5136)
is incremented and set to N7'', it is determined in step (5137) whether or not the value of the path length counter set in step (5134) matches the value of the pulse counter. Step (
5138), it is determined whether the sensor (PSl) is off. If the sensor (PSI) is turned off, the solenoid (SL2) is activated because the document being transported is suitable for passing through the longest path when copying the first sheet.

(SL3) is left off, and step (3139
) to set the pass mode to intermediate mode, and step (5)
140), state counter (SC2), 19"
and return to the main routine.

If it is determined in the step (5138) that the sensor (PSl) is not turned off yet, step (5141)
Set the bus length 7 counter to the value obtained by adding the pulse count (CPD) to the pulse counter value at this time. The number of pulses (CPD) here means that when the trailing edge of the longest document that can pass through the longest path passes the sensor (psl), the leading edge position of the document is the reference for the number of pulses (cpc). This is the number of pulses corresponding to the distance from the leading edge position of the document. Next, in step (8142), the state counter (SC2) is incremented and the process returns to the main routine.

State counter (SC2) in step (5142)
is incremented and set to "8", in step (5143) it is determined whether the value of the path length counter set in step (5141) matches the value of the pulse counter. If it matches, step (
5144), it is determined whether the sensor (PSl) is off. If the sensor (psl) is turned off at °C, the document being transported is suitable for passing through the longest path.
In step (3145), the path mode is set to the longest mode, and in step (5146), the state counter (s
c2) and return to the main routine.

If it is determined in step (5144) that the sensor (PSl) has not been turned off yet, the document length exceeds the limit that can be circulated in the longest path, so step (5147) is performed.
Set the pass mode to eject mode.

Then, the process returns to step (5146) to the C main routine.

State counter (SC2) in step (5146)
is incremented and set to 19, or the steps (5113), (5125), (51
33), (5140), the sensor (PS4a), (
Wait until PS4b) is turned on and proceed to step (5149).
) to determine whether the pass mode is the ejection mode. If the mode is not the ejection mode, the preset number of copies is decremented in step (5150), and the number of copies is decremented in step (S151).
) to determine whether the number of copies is 10'' or not. If the number of copies is not 0, copying is continued, so in step (5152) the solenoid (SL4) is turned on and preparations are made to circulate the original. do. Next, step (5153)
to reset the first flag to "0" and proceed to step (51
At step 54), the state counter (sc2) is set to 12 and the process returns to the main routine.

On the other hand, if the determination is YES in step (5149) or (5151), the solenoid (SL4) is turned off in step (5155) in order to eject the document;
Reset the state counter (SC2) to -0,
End this subroutine.

9a to 9c show a subroutine for executing paper jam detection processing.

First, in step (5200), the state counter (SC3) for detecting a document jam is checked, and the following steps are executed according to the count value.

If the state counter (SC3) is 10'', the process returns to the main routine without performing the same process.

In the step (558), the state counter (SC3
) is set to 11〃, in step (5201), a value obtained by adding the number of pulses (CIA) to the value of the pulse counter at this time is set as the paper jam detection power. The number of pulses (CJA) here is from sensor (PSl) to (PS2)
This is the number of pulses corresponding to the distance between the two and a slight detection margin. Next, in step (5202), the state counter (sc3) is incremented and the process returns to the main routine.

In step (5202), the state counter (SC3)
is incremented and set to S2'', it is determined in step (5203) whether the sensor (PS2) is on or not. If the sensor (PS2) is on, step (5203) is performed.
5204), a value obtained by adding the number of pulses (CJB) to the counter value at this time is set in the paper jam detection counter.

The number of pulses (CJB) here is from sensor (PS2) to (P
This is the number of pulses corresponding to the distance between S3) and a slight detection margin. Next, in step (S205), the state counter (SC3) is incremented, and the process returns to the main routine.

On the other hand, if it is determined in step (5203) that the sensor (ps2) is not turned on yet, step (52
In step 06), it is determined whether the value of the paper jam detection counter set in step (5201) matches the value of the pulse counter. If both match, the sensor (psl
) to (PS2), a paper jam handling subroutine is executed in step (5207), and the state counter (SC3) is reset to "0" in step (5208). and return to the main routine.

In step (3205), the state counter (SC3)
is incremented and set to "3", it is determined in step (5209) whether the sensor (PS3) is on or not. If the sensor (PS3) is on, step (5209) is performed.
5210) and (5212) to check the pass mode. If the pass mode is set to the initial mode or the shortest mode, in step (5211) the paper jam detection counter is set to a value obtained by adding the pulse count (CJC) to the value of the pulse counter at this time. The number of pulses (CJC) here is the sensor (P) when the document passes through the shortest path.
The number of pulses corresponds to the distance between S3) to (PS4a) and (PS4b) plus a slight detection margin.

Next, in step (5215), the state counter (5
C3) is incremented and the process returns to the main routine.

If the pass mode is set to the intermediate mode, a value obtained by adding the number of pulses (CJD) to the value of the timer counter at this time is set in the paper jam detection counter in step (5213). The number of pulses (CJD) here is the number of pulses (PS3) to (PS4) when the original passes through the intermediate path.
The number of pulses corresponds to the distance between PS4b) and a slight detection margin. Next, the step (521
5) and return to the main routine.

If the pass mode is set to the longest mode or ejection mode, in step (5214) the paper jam detection counter is set to a value obtained by adding the pulse count (CJE) to the value of the pulse counter at this time. The number of pulses (CJE) here is the sensor (PS3) when the document passes through the longest path.
The number of pulses corresponds to the distance between PS4a) and PS4b plus a slight detection margin.

Next, the process returns to the main routine via the step (5215).

On the other hand, if it is determined in step (5209) that the sensor (PS3) is still on and there is no “C”, step (5209)
In step 216), it is determined whether the value of the paper jam detection counter set in step (5204) matches the value of the pulse counter. If both match, the sensor (ps
It is determined that a document jam has occurred between 2) and (PS3), the paper jam handling subroutine is executed in step (5218), and the state counter (SC3) is set to v'O〃 in step (5219). Reset and return to main routine.

At step (5215), the state counter (SC3)
is incremented and set to N4, it is determined in step (5221) whether or not the sensors (PS4a), (PS4b) are on.
4b) is turned on, it is determined in step (5222) whether the pass mode is the discharge mode. If it is not the discharge mode, the preset number of copies, which is "", is decremented in step (S223), and it is determined in step (5224) whether the number of copies is 10". The number of copies is -O〃
Otherwise, the copying will continue, so step (5)
225), the paper jam detection counter is set to a value obtained by adding the number of pulses (CJG) to the counter value at this time. The number of pulses (CJG) here is the sensor (PS4a), (P
This is the number of pulses corresponding to the distance between S4b) and (PS2) plus a slight detection margin. Next, in step (S226), the state counter (SC3) is set to 12".
Return to main routine.

If YES is determined in step (5222) or (5224), the document is ejected, and the number of pulses (CJF) is added to the current pulse counter value in the paper jam detection counter in step (5227). Set the value. The number of pulses (CJF) in this case is the number of pulses corresponding to the distance from the original force sensor (PS4a), (PS4b) to the ejection to the ejection tray @).

Next, in step (5228), the state counter (S
Set C3) to "3" and return to the main routine.

On the other hand, in the step (5221), the sensor (PS4a)
, (PS4b) is not turned on yet, in step (5229), the step (5211),
It is determined whether the value of the paper jam detection counter set in (5213) or (5214) respectively matches the value of the pulse counter. If both match, the sensor (P
It is determined that a document jam has occurred between S3) and (PS4a) and (PS4b), and a subroutine for handling the paper jam is executed in step (5230), and then in step (5231)
The state counter (SC3) is reset to 10" and the process returns to the main routine.

In the step (S228), the state counter (SC
3) is incremented and set to *5//, it is determined in step (5232) whether the sensor (PS5) is on. If the sensor (PS5) is turned on,
In step (5233), it is determined whether the value of the paper jam detection counter set in step (S227) matches the value of the pulse counter. If the two match, it is determined from the sensor (PS4a) and (ps4b) that a document jam has occurred between the document ejection section, and the process proceeds to step (S4).
234), executes the paper jam handling subroutine, and sets the state counter (SC3) to 1 in step (S235).
0'' and ends this subroutine.

FIG. 10 shows the steps (5207) and (5217).
, (5230).

The paper jam processing subroutine executed in (S234) is shown.

Here, first, in step (5250), the entire load of the entire device is turned off, and in step (5251), the display section (73) is turned off.
shows a paper jam. Then, step (S252)
State counter (SC4) for resetting paper jams
is set to 11, and this subroutine ends.

FIG. 11 shows a subroutine for executing paper jam reset processing.

First, in step (5300), the state counter (SC4) for resetting paper jam is checked, and the following steps are executed according to the count value.

If the state counter (SC4) is "0", the process returns to the main routine without performing the same process.

In the step (S252), the state counter (SC
4) is incremented and set to 11,
In step (5301), it is determined whether the reset switch (R5W) is on or not, and if it is on, step (5302)
) increments the state counter (SC4) and returns to the main routine.

State counter (sc4) in step (5302)
is incremented and set to 12, it is determined in step (5303) whether the reset switch (R5W) is off or not, and if it is turned off, a paper jam is displayed on the display unit (73) in step (5304). Turn off. Then, in step (5305), the state counter (SC4) is set to 1.
0" and ends this subroutine.

Effects of the Invention As is clear from the above description, according to the present invention, a plurality of document detection means installed on the document conveyance path, a means for generating pulses in synchronization with document conveyance, and a means for generating the pulses in synchronization with the document conveyance are provided. a counting means; a paper jam handling means for stopping the document conveying means and instructing a paper jam indication when the count value of the counting means reaches a certain value; and a means for temporarily stopping the conveyance of the document during the conveyance of the document. Since this stopping means is provided with a means for temporarily interrupting the operation of the paper jam removal means when the °C original is once stopped, the original is temporarily stopped in order to synchronize the original with the copy paper. However, the paper jam detection will not malfunction during such a stop, and the same mechanism can perform severe paper jam detection even when the paper conveyance speed changes, such as during enlarged/reduced copying.

[Brief explanation of the drawing]

The drawings show an embodiment of the copying apparatus according to the present invention, in which FIG. 1 is a schematic configuration diagram of the copying apparatus, FIG. 2 is a cross-sectional view of the original circulation conveyance path, FIG. 3 is a plan view of the operation panel, and The figure is a block diagram of the control circuit, and FIGS. 5 to 11 are flowcharts showing control procedures. (2) to (7)... Original transport roller, (40)...
Photosensitive drum, (82)...Encoder, (Ml)...
. . . Document transport motor, (PSl) to (PS5) . . . Photo sensor for document detection, (CPU) . . . Microcomputer, (scl) to (SC4) . . . State counter. Patent Applicant: Minolta Camera Co., Ltd. Figure 1 (PSl) - (P5) Atsushi E mail 70,000 yen (70,000 yen) Figure 3 Figure 4 Figure 1 Figure 1

Claims (1)

[Scope of Claims] 1. In a copying apparatus equipped with an automatic document circulation conveyance device that circulates the number of documents inserted from the document insertion section through a circulation conveyance path, the copying apparatus comprises means for circulating the document; a plurality of document detection means installed in a conveyance path; a means for generating pulses in synchronization with document conveyance; a means for counting the pulses; and when the count value of the counting means reaches a certain value, the document conveyance a paper jam handling means for stopping the means and instructing a paper jam display; a means for temporarily stopping the conveyance of the document during the conveyance of the document; A copying apparatus comprising: means for temporarily interrupting the operation of the means; 2. The copying apparatus according to claim 1, further comprising means for temporarily interrupting the operation of the paper jam removal means when the pulse generation interval becomes equal to or less than a certain value.