JPH03138253A - Image forming device - Google Patents

Abstract

PURPOSE:To detect remaining paper so as to perform appropriate disposal even without a paper detecting sensor at the part of the intermediate rollers of a paper feeding device by constructing an image forming device in such a way as to drive intermediate rollers of the paper feeding device for the specified time at the time of the image forming device being reset after being stopped during its action due to some abnormality and perform the disposal of the remaining paper upon detecting transfer paper by a temporary stop sensor. CONSTITUTION:When an image forming device is reset after being stopped during its action due to some abnormality, the intermediate rollers 26, 27 of a paper feeding device 16 are driven for the specified time. In case there is no transfer paper left at the part of the intermediate rollers 26, 27, no transfer paper is detected by a temporary stop sensor 29 even if the intermediate rollers 26, 27 are driven. The image forming device therefore enters in the idling state. In the case when any transfer paper 12 left at the part of the intermediate rollers 26, 27, this transfer paper is sent to resist rollers 28 with the driving of the intermediate rollers 26, 27 and detected by the temporary stop sensor 29, and the automatic discharge of the transfer paper or the disposal of remaining paper such as jammed paper is performed accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to an image forming apparatus such as an electrophotographic color copying machine.

Prior Art and Problems of the Invention In this type of electrophotographic copying machine, an image formed on a photoreceptor drum as an image forming body is formed by an image forming means equipped with a document reading device, an image processing device, a writing device, a developing device, etc. An image is formed in the area. Then, a transfer paper is supplied to the drum by a paper feeding device, and an image formed in an image area of the drum is transferred onto the transfer paper by a transfer device.

The paper feeding device usually consists of a plurality of upper and lower transfer paper trays, a delivery roller (first paper feed roller) that sends out the transfer paper from each tray, and a registration roller (second paper feed roller) that sends the transfer paper to the roller portion of the drum. A paper roller), a plurality of intermediate rollers disposed between the feed roller and the registration roller, and a temporary stop sensor (paper detection sensor) provided near the registration roller. During copying, transfer sheets are fed out one by one from the tray by a feeding roller, passed through an intermediate roller, and then sent to a registration roller. When the transfer paper is fed to the registration rollers and the pause sensor is turned on, the intermediate rollers stop and the feeding of the transfer paper is temporarily stopped. Thereafter, the registration rollers are driven in accordance with the rotation of the drum, and the transfer paper is supplied to the transfer device.

In such a copying machine, if the copying machine suddenly stops due to a paper jam or the like during continuous copying, paper may remain in the intermediate roller portion of the paper feeding device, that is, in the primary paper feeding path. If a paper detection sensor (intermediate sensor) is provided in the primary paper feeding path, such remaining paper can be detected. However, in order to reduce costs, ordinary copying machines are often not provided with an intermediate sensor, and in such cases, it is not possible to detect that paper remains in the primary paper feeding path. Therefore, after returning from the immediate stop, copying is performed with the transfer paper remaining in the primary paper feeding path, resulting in an abnormality.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and provide an image forming apparatus that can detect remaining paper and take appropriate measures even if there is no paper detection sensor at the intermediate roller of the paper feeding device.

Means for Solving the Problems An image forming apparatus according to the present invention includes an image forming body having an image area on its surface, an image forming means for forming an image on the image area of the image forming body, and a transfer paper supplied to the image forming body. and a transfer device that transfers the image formed in the image area of the image forming body onto transfer paper. , a registration roller that feeds the transfer paper to the transfer device portion of the image forming body, an intermediate roller disposed between the delivery roller and the registration roller, and a temporary stop sensor provided near the registration roller. In the forming device, when the device stops due to an abnormality during operation and then restarts, the intermediate roller of the paper feeding device is driven for a predetermined period of time, and if the temporary stop sensor detects transfer paper, the remaining paper is processed. It is characterized by what has been done.

The paper remaining process is preferably automatic ejection of the transfer paper.

The paper remaining process may also be a paper jam indication.

Operation: When the image forming apparatus stops due to an abnormality during operation and then returns to normal operation, the intermediate roller of the paper feeding device is driven for a predetermined period of time.

If no transfer paper remains at the intermediate roller, the temporary stop sensor will not detect the transfer paper even if the intermediate roller is driven. Therefore, the device remains in an idling state.

If the transfer paper remains at the intermediate roller, when the intermediate roller is driven, the transfer paper is fed to the registration roller, and a temporary stop sensor detects this. Then, automatic ejection of the transfer paper or handling of remaining paper such as a paper jam is performed. Therefore, there is no possibility that copying will be performed with paper remaining on the intermediate roller.

Embodiments Hereinafter, embodiments in which the present invention is applied to an electrophotographic color copying machine will be described with reference to the drawings.

FIG. 1 schematically shows the overall structure of a color copying machine, and FIG. 2 schematically shows the mechanical structure of the main parts.

As shown in FIG. 1, a copying machine is roughly divided into a reading section (1), an image processing section (2), a recording section (3), an operation section (4), and a control section (5).

As shown in FIG. 2, the reading section (1) has an original platen (6
), and converts the image into an electrical signal, and includes a carriage (7), a CCD image sensor (8), etc.

The image processing section (2) processes the output of the image sensor (8) of the reading section (1) and sends image information to the control section (5), and includes an image processing device and the like.

The operation unit (4) is a part operated by an operator for copying operations.

The control unit (5) controls each part of the copying machine,
It is equipped with a microcomputer.

The recording section (3) includes a photosensitive drum (9) as an image forming body.
It is equipped with Although not shown, the drum (9) is driven by a main motor and has an image area of a certain size on its surface. Also, around the drum (9), a charger (10), a laser writing device (11), 3
1 developing device (12a) (12b) (12c), transfer device (13), cleaning device (14), PCL (1
5), a paper feeding device (1B), a separation conveyance belt (17), a fixing device (18), and other known devices (not shown) are provided.

The red toner is in the first developing device (12a), and the red toner is in the second developing device (12a).
12b) is filled with blue toner, and the third developing device (12c) is filled with black toner.

The cleaning device (14) includes a leaning blade (19) that can be pressed onto and released from the photoreceptor drum (9).

The paper feed device (16) has three upper and lower transfer paper trays (20).
(21) (22), each tray (20) (21N22)
Three stages of upper and lower feed rollers (23
) (24) (25), feed roller (23) (2
4) It is provided with two intermediate rollers (2B) (27), upper and lower, which are provided in the middle of (25), and a registration roller (28) which is provided close to the drum (9). Also, a temporary stop sensor (29) is located near the registration roller (28).
) is provided.

The fixing device (18) includes a fixing roller (30), and a paper discharge sensor (31) is provided near the fixing roller (30). Although not shown, the conveyance belt (17) and fixing roller (30) are driven by a conveyance motor.

A paper wrapping sensor (32) is arranged in a portion forward of the transfer device (13) in the rotational direction of the drum (9).

The pause sensor (29) and the paper discharge sensor (31) are
For example, it consists of a limit switch. The paper wrapping sensor (32) is constituted by, for example, a reflective photoelectric switch that combines a light emitting diode and a phototransistor, and is arranged so as to face the surface of the drum (9). Note that FIG. 2 shows only the parts directly related to the present invention.

The above-mentioned copying machine is capable of monochrome copying using any one of red, blue, or black, and multicolor copying using two or three colors.

In the case of normal copying, while the drum (9) rotates once,
A document is scanned once by the reading section (1), and one image thereof is formed in the image area.

In the case of Qj color copying, image formation is completed in one rotation, and in the case of multicolor copying, image formation is completed in two or three rotations. Then, the paper feeding device (16) feeds the drum (9).
) is supplied during one rotation, and one image formed in the image area is transferred onto the one sheet of transfer paper.

The feeding of transfer paper by the paper feeding device (16) is performed as follows.

When feeding paper from the upper tray (20), the upper feed roller (23) feeds the transfer paper from the tray (20) and sends it to the registration roller (28). 29), the feeding of the transfer paper is temporarily stopped. When feeding paper from the middle tray (21), the transfer paper is sent out from the tray (21) by the middle feed roller (24), and transferred to the registration roller (28) by the upper intermediate roller (2B). When the leading edge of the transfer paper reaches the temporary stop sensor (29), the transfer paper is temporarily stopped. When feeding paper from the lower tray (22), the lower feed roller (25)
The transfer paper is sent out from the tray (22) and sent to the registration roller (28) by the lower intermediate roller (27) and the upper intermediate roller (2B), and its leading edge reaches the temporary stop sensor (29). Then, the feeding of the transfer paper will temporarily stop. In either case, the registration rollers (28) are driven in accordance with the rotation of the drum (9), and the transfer paper is supplied to the drum (9).

In the above-mentioned copying machine, for example, when a wrapping jam occurs in which the transfer paper wraps around the drum (9), the copying machine enters an immediate stop state in which all loads are stopped.

By the way, if such an immediate stop occurs during continuous copying, the intermediate roller (26) (2
Transfer paper may remain in the portion 7), that is, in the primary paper feeding path. If transfer paper remains in the registration roller (28), drum (9), and qualifier (18), it is removed by the pause sensor (29), paper wrapping sensor (32), and paper discharge sensor (31). However, since a paper detection sensor is not provided in the primary paper feed path, the transfer paper remaining in the primary paper feed path cannot be detected as it is.

For this reason, the copying machine described above detects the transfer paper remaining in the primary paper feeding path in the following manner.

In other words, when the power is turned on after an immediate stop, the upper intermediate roller (26) will be moved if paper is being fed from the middle tray (21), and the upper and lower rollers will be moved if paper is being fed from the lower tray (22). The intermediate rollers (211i) and (27) are each driven for a predetermined period of time, and it is checked whether the temporary stop sensor (29) is turned on.

If there is no transfer paper remaining at the intermediate rollers (26) (27), the pause sensor (29) will detect the transfer paper and turn on even if the intermediate rollers (28) (27) are driven. Never. Therefore, the copying machine remains in an idling state.

If the transfer paper remains at the intermediate rollers (26) and (27), when the intermediate rollers (2B) and (27) are driven, this transfer paper will be fed to the registration rollers (28) and temporarily The stop sensor (29) detects this and turns on. Then, automatic ejection of the transfer paper or handling of remaining paper such as a paper jam is performed. Therefore, the intermediate roller (26
) There is no possibility that copying will be performed with paper remaining in the part (27).

Next, an example of the operation of the above-mentioned copying machine will be described with reference to flowcharts shown in FIGS. 3 to 8.

The flowcharts in FIGS. 3 to 5 are routines for winding jam detection, and these routines are executed once at predetermined time intervals.

The flowchart in FIG. 3 shows a startup routine for winding jam detection.

In FIG. 3, first, it is checked in step 101 whether the registration roller (28) has started, and when the registration roller (28) has started, the winding processing counter is cleared in step 102, and the winding processing counter is cleared in step 103. Set check flag. Then, except when the registration roller (28) is activated, the process ends with only step 101. The winding processing counter is a counter for determining the operation timing for winding jam detection, and is counted up at regular intervals in another routine (not shown). In addition,
In the flowchart, the counter C1 flag is represented by F.

The flowchart in FIG. 4 shows a check routine for winding jam detection.

In FIG. 4, first, in step 201, it is checked whether the winding check flag is set, and if it is not set, the process is immediately terminated. As explained in FIG. 3, when the registration roller (28) is activated, the winding check flag is set, so step 202
Then, it is checked whether the winding processing counter has reached the light emitting diode lighting start value Vl (for example, 123). When the wrapping processing counter reaches Vl, the light emitting diode of the paper wrapping sensor (32) is turned on in step 203 to prepare for detection, and the process proceeds to step 204. If the winding processing counter has not reached Vl in step 202, the process directly advances to step 204. Step 204
Then, it is checked whether the winding processing counter has reached the detection start value V2 (for example, 145), and if it has reached (2), the winding jam detection flag is set in step 205, and the process proceeds to step 206. If the winding processing counter is not v2 in step 204, the process directly proceeds to step 20B.

In step 206, it is checked whether the winding processing counter is larger than V2, and if it is not, the processing is immediately terminated. If the winding processing counter is larger than V2, it is checked in step 207 whether the winding jam occurrence flag is set, and if it is not set, step 2 is performed.
Proceed to 08. In step 208, it is checked whether the winding processing counter is smaller than the detection end value V3 (for example, 265), and if it is not smaller, the processing is ended. If the wrapping processing counter is smaller than V3 in step 208, the light emitting diode of the paper wrapping sensor (32) is turned off in step 209, the wrapping jam detection flag is reset in step 210, and the wrapping check flag is turned off in step 211. Reset and end the process.

If the wrapping jam occurrence flag is set in step 207, a wrapping jam processing routine is executed in step 212, and then an immediate stop routine is executed in step 213, and the process ends.

In the winding jam processing routine of step 212, a winding jam is displayed and necessary data is stored in the non-volatile memory. In the immediate stop routine of step 213, all loads, such as the main motor of the drum (9), the solenoid of the feed roller (23) (24) (25), the solenoid of the intermediate roller (26N27), and the solenoid of the registration roller (28), are , each high voltage power supply, reading section (1)
The scanning motor of the carriage (7), the exposure lamp, the motor and clutch of the developing units (12a) (12b) (12c), the writing device (II), etc. are stopped.

The flowchart in FIG. 5 shows a determination routine for winding jam detection.

In FIG. 5, first, it is checked in step 301 whether the winding jam detection flag is set, and if it is not set, the sensor data is cleared in step 302, the detection counter is cleared in step 303, and the processing is performed. end.

As is clear from the explanation of FIG. 4, when the winding processing counter is between the detection start value V2 and the detection end value V3, the winding jam detection flag is set. Therefore, the process proceeds from step 301 to step 304, and it is checked whether the AD conversion has been completed. The output of the phototransistor of the paper wrapped sensor (32) is analog data, which is A
The signal is converted into D and sent to the computer of the control section (5).

Until this AD conversion is completed, the process is terminated in step 304, and when the AD conversion is completed, the process proceeds to step 305 to check whether the sensor data is larger than the threshold value S (for example, 170). The sensor data is digital data obtained by AD converting the output of the paper wrapping sensor (32), and when this is greater than S, it is determined that the transfer paper is wrapped around the drum (9), and the detection counter is incremented in step 306. , the sensor data is cleared in step 307, and the process proceeds to step 308. The detection counter is a counter that represents the number of times the sensor data was greater than S, that is, the number of times it was determined that the paper was wrapped. Step 30
If the sensor data is not larger than S in step 5, the process directly advances to step 308. In step 308, it is checked whether the detection counter is greater than the reference number N (for example, 20), and if it is not greater, the process is immediately terminated. If the detection counter is larger than N in step 308, a winding jam occurrence flag is set in step 309, and the process ends.

In this way, while the wrapping jam detection flag is set, that is, while the wrapping processing counter is between the detection start value V2 and the detection end value V3, the output of the paper wrapping sensor (32) is checked, and this is determined as the threshold value. When the number of times the value S is exceeded exceeds the reference number N, it is determined that a winding jam has occurred, and a winding jam occurrence flag is set. When this flag is set, steps 207 to 2 in FIG.
Steps 12 and 213 are executed to perform winding jam processing and immediate stop.

The flowchart in FIG. 6 shows part of the processing when the power is turned on.

In FIG. 6, when the power is turned on, first, system initialization is performed in step 401, buffer initialization is performed in step 402, and it is checked in step 403 whether or not there has been a jam stop. If the machine stops due to a jam and the power is cut off, the data is stored in non-volatile memory. And if there was no jam stop,
In step 404, an initial display is performed on the operating section (4>), and the process proceeds to step 405. If a jam has stopped in step 403, a display immediately before a jam is made on the operating section (4) is displayed in step 406, and the process proceeds to step 405.

In step 405, it is determined whether or not there is transfer paper at the registration roller (28) by checking the output of the pause sensor (29). If not, step 40
Proceed to step 7. In step 407, by checking the output of the paper ejection sensor (31), it is determined whether or not there is transfer paper in the fixing device (18) section, that is, the paper ejection section.
Proceed to step 408. In step 408, by checking the output of the paper wrapping sensor (32), the drum (9
), and if it is not wrapped, the process proceeds to step 409, where it is checked whether there has been an abnormal stop. If there is an abnormal stop such as an immediate stop, the data is stored in the non-volatile memory. If there is an abnormal stop, a remaining paper detection routine in step 410 is executed, and the process proceeds to step 411. This remaining paper detection routine checks whether there is any transfer paper remaining at the intermediate rollers (26) and (27) of the paper feeder (16), and if so, takes appropriate measures to deal with the remaining paper. It is. Note that this routine will be described later. If there is no abnormal stop in step 409, the process directly advances to step 411.

If it is determined in step 408 that the transfer paper is wrapped around the drum (9), the process proceeds to step 412 where a wrapping jam is displayed, an abnormality flag is set in step 413, and the process proceeds to step 411. If there is a transfer sheet in the paper discharge section in step 407, the process proceeds to step 414, where a paper discharge section jam is displayed, and the process proceeds to step 413. If there is a transfer sheet at the registration roller (28) in step 405, the process proceeds to step 415, where a second paper feed unit jam is displayed, and the process proceeds to step 413.

In step 411, it is checked whether the abnormality flag is set, and if it is set, the process proceeds to step 416, where a normal jam handling routine is executed and the program routine is stopped.

If the abnormality flag is not set in step 411, the process proceeds to step 417, where warm-up is started and a normal program following the idling routine is executed.

The flowchart in FIG. 7 shows that the intermediate rollers (26) (27
), that is, an example of a remaining paper detection processing routine when paper remains in the second paper feeding section, the paper is automatically discharged and idling is started.

In FIG. 7, first, in step 501, it is checked whether the upper tray (20) was being used at the time of the immediate stop.
Otherwise, proceed to step 502. If you are using the upper tray (20), use the intermediate roller (2G)
Since no transfer paper remains in the area (27), the process is terminated. In step 502, it is checked whether the middle tray (21) is being used, and if not, the process proceeds to step 503 and the lower tray (22) is used.
Check whether it was used, and if not, terminate the process. In step 503, the lower tray (
22), the upper and lower intermediate rollers (2B
) There may be some transfer paper left in (27), so
In step 504, the upper intermediate roller (26) is turned on, and in step 505, the lower intermediate roller (27) is turned on, and in step 506, an appropriate number (for example, 570) is set in the first timer T1. move on. This first timer TI uses an intermediate roller (
28) represents the maximum time for driving (27). If the middle tray (21) was used in step 502, transfer paper may remain on the upper intermediate roller (2B), so turn on the upper intermediate roller (2B) in step 508. In step 509, an appropriate number (for example, 350) is set in the first timer T1, and the process proceeds to step 507. When the middle tray (21) is used, the time from when the intermediate roller (2B) is driven until the remaining transfer paper reaches the temporary stop sensor (29) is the same as when the lower tray (22) is used. Since the number set in the first timer TI in step 509 is smaller than the number set in step 506, the number set in the first timer TI is shorter than the number set in step 506.

In step 507, the timing counter is cleared,
In step 510, the conveyor belt (17) and fixing roller (3)
0) is turned on, and step 511
Proceed to. This timing counter is a counter for determining the timing for detecting remaining paper and automatically discharging paper, and is counted up at regular intervals in another routine (not shown). In step 511, it is checked whether the timing counter has exceeded the first timer TI, and if not, the process proceeds to step 512, where the pause sensor (
29) is turned on, and if not, return to step 511. Intermediate roller (2B) (27
) If there is no transfer paper left in the area, remove the intermediate roller (
Even if 26) and (27) are driven for a time corresponding to the first timer TI, the pause sensor (29) does not turn on. Therefore, proceeding from step 511 to step 513,
The conveyance motor is turned off, the lower intermediate roller (27) is turned off in step 514, and the upper intermediate roller (26) is turned off in step 515, and the process ends. Intermediate roller (
2G) If the transfer paper remains in the portion (27), the temporary stop sensor (29) is turned on before the value of the timing counter reaches the value of the first timer Tl. therefore,
If the pause sensor (29) is turned on in step 512, it is determined that there is paper remaining, the process proceeds to step 516, the timing counter is cleared, and the timing counter is cleared in step 51.
Turn on the registration roller (28) in step 7 and proceed to step 51.
Proceed to step 8. When the registration roller (28) is turned on, the remaining transfer paper is thereby conveyed to the conveyor belt (17), which is then conveyed towards the fuser (18) by the already turned on conveyor belt (17).

In step 518, it is determined whether the timing counter has become equal to the second timer T2.

This second timer T2 represents the maximum time for driving the conveyance motor after turning on the registration roller (28) in order to automatically discharge the remaining transfer paper. If the timing counter is not equal to the second timer in step 51g, the process proceeds to step 519, and the discharge sensor (31)
is turned on, and if not, return to step 518. When the transfer paper is conveyed normally, the paper discharge sensor (31) is turned on by the time the timing counter becomes equal to the second timer T2. Therefore, when the timing counter becomes equal to the second timer in step 51g, it is determined that a jam has occurred during conveyance, the process proceeds to step 520, the conveyance motor is turned off, and the registration roller (28) is turned off in step 521. Turn off and step 5
In step 22, a jam during conveyance is displayed, and in step 523, an abnormality flag is set, and the process ends. Step 519
If the paper discharge sensor (31) is turned on, it is determined that the transfer paper has been normally conveyed to the fixing device (18), and the process proceeds to step 524, where the timing counter is cleared, and in step 525, the paper size data is a predetermined number (for example, 4
5) is set in the third timer T3, and the process proceeds to step 52G.

This third timer T3 represents the maximum time for driving the conveyance motor after the paper discharge sensor (31) is turned on in order to automatically discharge the remaining transfer paper.

In step 526, it is checked whether the timing counter has exceeded the third timer T3, and if not, the process proceeds to step 527, and it is checked whether the paper ejection sensor (31) is turned off. Step 526
Return to If the transfer paper is ejected normally, the paper ejection sensor (3
1) is turned off. Therefore, when the timing counter becomes equal to or higher than the third timer in step 526, it is determined that a jam has occurred in the fuser (18), and the process proceeds to step 528, where the conveyance motor is turned off, and step 52
9, turn off the registration roller (28), and step 530
In step 531, a paper discharge section jam is displayed, and in step 531, an abnormality flag is set, and the process ends. If the paper ejection sensor (31) is turned off in step 527, it is determined that the transfer paper has been normally ejected from the fixing device (18), and step 5
At step 32, the conveyance motor is turned off, and at step 533, the registration roller (28) is turned off, thereby terminating the process.

In the paper remaining detection routine shown in FIG. 7, if there is no paper remaining, that is, steps 511 to 5H,
14 and 515 and terminates the process, or if there is paper remaining but the paper is normally ejected, that is, if steps 527 to 532 and 533 are executed and the process terminates, an error flag is set. is not set, so when returning to the routine of Figure 6,
Proceeding from step 411 to step 417, idling is started.

In the paper remaining detection routine shown in FIG. 7, if there is paper remaining and it cannot be ejected normally, that is, steps 51111 to 520, 521, and 522
and 523 to terminate the process, or if steps 526 to 528, 529, 530 and 531 are executed to terminate the process, the abnormality flag is set and the routine returns to the routine of FIG. When this happens, the process proceeds from step 411 to step 41B, where a jam processing routine is executed.

The flowchart in FIG. 8 shows an example of a paper remaining detection processing routine when a paper jam is displayed when paper remains in the first paper feeding section and idling is not started.

In FIG. 8, steps 501 to 515 are the same as in FIG. 7, and steps 516 to 515 in FIG.
Instead of the process in step 33, processes in steps 616 and 617 are performed. In other words, there is paper left and step 5
If the pause sensor (29) is turned on in step 15, the process advances to step 616, where a jam in the first paper feed section is displayed;
An abnormality flag is set in step 617, and the process ends. Therefore, if there is any remaining paper, when returning to the routine shown in FIG.
Proceed to step 6 to clear the jam and do not start idling. Then, as in the case of a normal jam, the operator removes the remaining paper and copies.

Effects of the Invention According to the image forming apparatus of the present invention, as described above, it is possible to detect remaining paper and take appropriate measures even if there is no paper detection sensor in the intermediate roller portion of the paper feeding device.

[Brief explanation of the drawing]

Fig. 1 is an overall schematic configuration diagram of an electrophotographic color copying machine showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional view schematically showing the main parts of the copying machine, and Fig. 3 is a wrapping jam detection. FIG. 4 is a flowchart showing an example of the process of the check routine for detecting a winding jam; FIG. 5 is a flow chart showing an example of the process of the determination routine for detecting a winding jam. Flowchart, FIG. 6 is a flowchart showing an example of the processing when the power is turned on, FIG. 7 is a flowchart showing one example of the processing of the remaining paper detection routine, and FIG. 8 is another example of the processing of the remaining paper detection routine. It is a flowchart which shows. (1)...Reading section, (2)...Image processing section, (
3)...Recording section, (4)...Operation section, (5)...
Control unit, (9)...photosensitive drum (image forming body), (
13)...Transfer device, (16)...Paper feeding device, (20
) (21) (22)...Transfer paper tray, (22)
(23) (24)...Feeding roller, (2B) (
27)... Intermediate roller, (2g)... Registration roller, (29)... Temporary stop sensor. that's all

Claims (3)

[Claims] (1) An image forming body having an image area on its surface, an image forming means for forming an image on the image area of the image forming body, a paper feeding device that supplies transfer paper to the image forming body, and an image area of the image forming body It is equipped with a transfer device that transfers the image formed on the transfer paper to the transfer paper.
The paper feeding device includes a transfer paper tray, a delivery roller that sends out the transfer paper from the tray, a registration roller that sends the transfer paper to the transfer device portion of the image forming body, and an intermediate roller arranged between the delivery roller and the registration roller. In an image forming apparatus equipped with a temporary stop sensor installed near the registration roller, when the apparatus stops due to an error during operation and then returns to normal operation, the intermediate roller of the paper feeder is driven for a predetermined period of time. An image forming apparatus characterized in that, if a temporary stop sensor detects transfer paper, processing for remaining paper is performed. (2) The image forming apparatus according to claim 1, wherein the remaining paper processing is automatic ejection of transfer paper. (3) The image forming apparatus according to claim 1, wherein the remaining paper processing is a paper jam indication.