JPH09258634A - Electrophotographic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrophotographic device capable of surely preventing reset for detecting whether an interchangeable cartridge is new or old before attaching the cartridge in an electrophotographic device main body. SOLUTION: This device is provided with a spiral spring gear energizing the cartridge A to move toward a position taken when it is new one on a detection piece gear 26, while it is provided with a latch lever 29 and a spring 30 for locking the gear 26 at a position taken when it shows an old state. By inserting a reset member 34 in a U-shaped slit 33a formed on the cover 33 of the cartridge A and releasing the locking of the gear 26, the gear 26 is restored to an initial position. A copying machine main body 1 is constituted so that it can not be rotated until the driving system of the cartridge A is attached to the main body 1, whereby the position of the gear 26 is switched by the rotation of the main body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic apparatus such as a copying machine, a laser printer or a laser facsimile apparatus, and more particularly, to a method for improving the old and new detecting mechanism of a replacement cartridge functioning as a process unit or a developing unit of the copying machine. The present invention relates to an electrophotographic device for which

[0002]

2. Description of the Related Art Conventionally, in an electrophotographic apparatus, it has often been performed to determine whether or not a photosensitive cartridge to be mounted in the apparatus body is new. For example, in Japanese Utility Model Publication No. 1-21311, a counter for displaying the life of process means and a reset means including a photo switch are provided, and a cam member that functions as an actuator by driving a drum type photoconductor is associated with the reset means. It is disclosed that the counter is cleared by changing the position from the matching position to the non-engaging position.

[0003]

However, in the case of the above-mentioned conventional example, when the cartridge is recycled, the cam member constituting the detecting means remains displaced to the position indicating the use and is reset to the initial position. Needs to operate the cam member installed in the cartridge,
It was not easy to return to the initial position.

Further, since a part of the cam member is mounted so as to project from the upper surface of the cartridge, there is a possibility that the user may erroneously displace the cam member. In such a case, on the electrophotographic apparatus main body side. There was a risk that the old and new state would change and the number of used sheets would be reset.

Further, it is not impossible for some unscrupulous persons to intentionally displace the cam member to make a used article look like a new article, and there is a fear that the cartridge may be altered intentionally.

The present invention has been made in order to solve the above-mentioned conventional problems, and an electronic device devised so as to surely prevent the reset of the old and new detection of the replacement cartridge before being mounted in the main body of the electrophotographic apparatus. It is intended to provide a photographic device.

[0007]

In order to achieve the above object, according to the present invention, a cartridge having process means incorporated therein and detachable from the main body of an electrophotographic apparatus, and a new / old detection mechanism for determining whether or not the cartridge is new are provided. In the electrophotographic apparatus including the above, the old and new detection mechanism is configured as follows.

That is, a detection member provided in the cartridge for detecting old and new of the cartridge, a counter for displaying a usage degree of the cartridge, a reset member for resetting the counter, and the detection member are provided. Locking means for locking at the old state position, and lock releasing means for unlocking the detection member by inserting the reset member from the outside of the cartridge into a hole of a specific shape provided in the frame body of the cartridge, The detection member is configured to return to the initial position after unlocking.

In the above structure, the locking means is provided with a latch member which engages with an intermittent gear integrally provided on the detecting member in a state of preventing reverse rotation. Further, the detection member includes a first elastic urging member that urges the detection member so as to move it toward the position when it is new. Further, a second elastic biasing member for biasing the latching member so as to be switchable is provided at a position where the latch member locks the detection member and a position where the lock to the detection member is released.

According to the above structure, the detection member is returned to the initial position by the urging force of the second elastic urging member by pushing the latch member through the hole of the cartridge frame having the specific shape by the reset member. Therefore, it is possible to simplify the resetting of the detection piece to the initial position during recycling.

Further, a cartridge having process means incorporated therein and detachable from the main body of the electrophotographic apparatus, a detection member provided in the cartridge for detecting old and new, and a detection member provided in the cartridge. By providing a new and old detection mechanism having a drive system for switching the old and new detection positions, and by configuring the drive system to be rotatable by being attached to the main body of the electrophotographic apparatus, a user or the like can Even if the position of the detection piece is accidentally moved and the old and new state is changed, the count of the number of used sheets is not reset. Further, since the detection member and the drive system are provided inside the cartridge, the cartridge cannot be easily modified. Further, since the specific resetting member is used for resetting the detecting member, it is difficult to modify the detecting member by using another tool or the like.

Further, an operating member for interfering with the detecting member and performing the old and new detecting operation when the main body of the electrophotographic apparatus is rotated forward is provided, and the detecting member is retracted from the process means during the main operation of the electrophotographic apparatus. In the main operation of the electrophotographic apparatus, a jam can be detected by the operating member.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a copying machine as an electrophotographic apparatus according to this embodiment. As shown in this figure, reference numeral 1 is a main body of a copying machine, and an original placing table 2 is provided on an upper surface portion thereof, and an exposure optical system is provided under the original placing table 2. The exposure optical system
A copy lamp 3 that scans an original document (not shown) placed on the original document table 2 while irradiating it with light, a selfoc lens 5 that guides reflected light from the original document to the photosensitive drum 4, an automatic exposure old / new detection sensor It consists of 6 mag.

On the outer periphery of the photosensitive drum 4, there are a main charger 7 for charging the surface thereof to a predetermined potential, a developing cartridge 8 for developing an electrostatic latent image formed on the surface of the photosensitive drum 4, and a photosensitive drum 4. A transfer charger 9 for transferring the toner image on the surface to a sheet, a cleaning device 10 for collecting the residual toner on the surface of the photosensitive drum 4, a charge eliminating lamp 11 and the like are provided.

Reference numeral 8a is a magnet roller provided in the developing cartridge 8, and 8b is a toner density detecting sensor. 10a is a cleaning blade,
10b is a sub-blade, and the cleaning device 10 including these parts and the photosensitive drum unit including the photosensitive drum 4 and the like can be replaced as a cartridge A integrally supported by a single frame. It is configured.

On the paper input side of the photosensitive drum 4, paper feed rollers 12 and 13 for supplying paper at a predetermined timing,
A PS plate 14, a paper feed cassette 15 and the like are provided, as well as a paper feed detection switch 16, a manual paper feed detection switch 17, a cassette paper feed solenoid 18, and the like.

On the other hand, on the paper output side of the photoconductor drum 4, a peeling roller 19 for peeling the transferred paper from the surface of the photoconductor drum 4, a fixing device 20 for fixing the toner image transferred on the paper to the paper, and A paper output detection switch 21 and the like are provided. Note that the fixing device 20 includes the heater lamp 2
It is composed of an upper heat roller 20b in which 0a is incorporated, an upper heat roller 20b and a lower heat roller 20c which presses and sandwiches a sheet. Reference numeral 22 is a thermistor / temperature fuse that detects the heating temperature of the upper heat roller 20b of the fixing device 20 to the paper. Reference numeral 23 is a cooling fan driven by a main motor (not shown) provided in the copying machine main body 1.

Next, the copy operation in the copying machine having the above-mentioned structure will be described. A power switch (not shown) is turned off.
If the answer is N, the warm-up process is first performed.
After this is completed, when the copy start switch (not shown) is turned on, the copy lamp 3 of the exposure optical system scans the document placed on the document table 2. Light reflected from the original at this time is applied to the photosensitive drum 4 via the SELFOC lens 5, and an electrostatic latent image is formed on the surface of the photosensitive drum 4 charged to a predetermined potential by the main charger 7. It

Next, this electrostatic latent image is developed by the toner supplied from the developing cartridge 8. The toner image on the surface of the photoconductor drum 4 is transferred to the paper supplied from the paper feed cassette 15 by the transfer charger 9, and is thermally fixed on the paper by the fixing device 20. As a result, a copy image corresponding to the original image is formed on the sheet. Such a series of copying operations is controlled by a control device (not shown) including a microcomputer.

FIG. 2 shows the cartridge A and a state in which the cartridge A is being taken out of the copying machine main body 1. The cartridge A is set at a predetermined position in the copying machine main body 1.
To replace the unit with a new unit, the clamshell type copying machine body 1 is opened, the old unit is manually pulled out in the direction of arrow a, and a new cartridge A is loaded.

FIG. 3 shows a cartridge old and new detection mechanism. In this figure, reference numeral 24 is a frame, on which a photosensitive drum 4 having a drum gear 25 at its shaft end is rotatably supported facing one side surface. Further, on the side surface of the frame body 24, the detection piece gear 26 and the first and second idle gears 27, 28 interposed between the drum gear 25 and the detection piece gear 26 are provided.
Is rotatably supported, and the detection piece gear 26
A latch lever 29, which serves as a locking means for locking the to the old position, is pivotally supported in a seesaw shape.
The latch lever 29 has a triangular engaging claw 29 at its tip.
In addition to a, a contact projection 29b with which a reset member 34, which will be described later, interferes is provided on the upper surface on the base end side of the rotation center pivotally supported by the frame body 24.

Further, a spring 30 as an elastic biasing means is stretched between the base end portion of the latch lever 29 and the side surface of the frame body. The spring 30 causes the latch lever 29 to move the detection piece gear 26. It is elastically biased so as to be switchable between a locked position and a position where the detection piece gear 26 is unlocked. 31 is an actuator, 32
Is a new / old detection sensor, 33 is a cover that covers the side surface of the frame 24, and 34 is a U-shaped reset member that is inserted from the U-shaped slit 33a of the cover 33 and interferes with the latch lever 29. The cover 34 includes a part of the drum gear 25, the detection piece gear 26, the first and second idle gears 27 and 2.
8, the latch lever 29 and the like are fitted into the frame 24.

The detection piece gear 26 is provided with an operating piece 26b which rotates integrally with the gear portion 26a. The operating piece 26b interferes with the operated piece 31a of the actuator 31 to bring down the operated piece 31a, The sensor switching piece 31c of the actuator 31 enters the old and new detection sensor 32,
It is configured so as to perform an operation of F.

Further, as shown in FIG.
Has a tubular portion 26c behind the gear portion 26a.
On the other hand, a boss 35 is projected on the side surface of the frame 24,
With the inner end of the spring spring 36 engaged with the cutout portion 35a of the boss 35, and with the outer end of the spring spring 36 engaged with the cutout portion 26d provided in the detection piece gear tubular portion 26c, the tubular shape The spring spring 36 is inserted in the portion 26c. Further, the gear portion 26a of the detection piece gear 26 is configured by an intermittent gear, that is, a gear having a portion where teeth are not formed so that the detection piece gear 26 does not rotate once.

In the old and new detection mechanism having such a configuration, the rotation of the photosensitive drum 4 in the direction of the arrow b is transmitted to the detection piece gear 26 via the first and second idle gears 27 and 28, whereby the detection is performed. The one-sided gear 26 is rotated in the direction of arrow c, which is opposite to that of the photosensitive drum 4. This rotation causes the detection piece gear 2
6 is the actuated piece 31 of the actuator 31.
The actuator 31 is tilted by interfering with a and the operated piece 31a is brought into contact with the old and new detection sensor 32, thereby turning off the old and new detection sensor 32 in the ON state.

Then, after the old and new detection sensors 32 are turned off, the detection piece gear 26 further rotates, whereby the actuator 31 returns to the original posture, and at the same time, the old and new detection sensors 32 are turned on again. Become. As a result, the number counting memory provided on the copying machine main body 1 side is cleared, and as a result, it can be determined that the drum is new.

FIG. 5 shows the state before the latch lever 29 is released.
FIG. 6 shows the state after the latch is released, that is, the reset state. As shown in FIG. 5, when the detection piece gear 26 rotates in the direction of the arrow c, the tip engaging claw 29a of the latch lever 29.
Is engaged with the gear portion 26a of the detection piece gear 26, the rotation of the detection piece gear 26 in the reverse direction is restricted.
In addition, the latch lever engaging claw 29a and the detection piece gear portion 26a
By releasing the engagement of, the detection piece gear 26 can be returned to the initial position by the restoring force of the spiral spring 36. Therefore, at the time of recycling, the reset member 34 can be initialized, that is, returned to the initial position, without disassembling and taking out the components in the cartridge A.

That is, when the latch lever 29 functions to prevent the detection piece gear 26 from moving backward, the engaging claw 29a of the latch lever 29 engages with the tooth bottom of the detection piece gear portion 26a. At this time, the latch lever 29 is restricted from being lifted up by the urging force of the spring 30, whereby the reverse rotation of the detection piece gear 26 is prevented.

When the engagement of the latch lever 29 is released, the reset member 34 is inserted from the outside of the frame body 24 into the slit 33a of the cover 33 as shown in FIG.
At this time, in the latch lever 29, the tip of the inserted reset member 34 interferes with the contact protrusion 29b,
The engagement claw 29a is disengaged from the tooth surface of the detection piece gear portion 26a as a result of being rotated in the direction of the arrow d. The detection piece gear 2 disengaged from the latch lever 29 in this way
6 is returned to the initial position by the restoring force of the power spring 36.

As described above, the lock of the detection piece gear 26 cannot be unlocked unless the dedicated reset member 34 is inserted from the outside of the cartridge into the slit 33a of the specific shape provided in the frame 24 of the cartridge A. Therefore, the user cannot easily unlock the detection piece gear 26, and the user's erroneous operation can be reliably prevented.

Further, in this case, the action piece 26b of the detection piece gear 26 only operates when the actuator 31 is pushed.
Although it protrudes to the outside from a slit-shaped small opening g opened at the lower end between the cover 4 and the cover 33, after the actuator 31 is pushed, it retreats into the frame 24 and is hidden in the frame. Therefore, an operator such as a user may use the action piece 2
6 disappears. Therefore, it is impossible to move the detection piece gear 26 to modify it.

As described above, according to the old and new detection mechanism having the above-described structure, the mainspring spring 36 for urging the new detection mechanism is provided in the detection piece gear 26 having the gear portion 26a composed of the intermittent gear. A latch lever 29 is provided to lock the detection piece gear 26 at the position in the old state, and the latch lever 29 can switch between a position where the detection piece gear 26 is locked and a position where the detection piece gear 26 is unlocked. Since the spring 30 for urging the spring is provided, the detection piece gear 26 can be automatically returned to the initial position by the restoring force of the spring spring 36 by simply pushing the latch lever 29 through the slit 33a of the cover 33. it can.

Further, in that case, in order to prevent erroneous operation of the driving member incorporated around the detection piece gear 26, the driving member may be covered with the frame 24 or the cover 33. The detection piece gear 26 can be easily reset.

Further, the latch lever 29 is attached to the detection piece gear 26.
Since the detection piece gear 26 is returned to the initial position by being disengaged from, the movement of parts such as the photoconductor drum 4 which must be replaced at the time of recycling causes
Since the detection piece gear 26 is returned to the initial position, the return process is not forgotten. Therefore, it can be said that it is suitable for the replacement of the life parts in the cartridge A.

Next, the method of connecting the drive systems in the frame 24 will be described. FIG. 7 shows the copying machine main body 1 of the cartridge A.
FIG. 8 shows a state before attachment to the device and FIG. 8 shows a state after attachment. As shown in FIG. 7, the idle gear 27 is mounted on the rotary shaft 27a of the first idle gear 27.
A return spring 37 is provided for urging in a direction to disengage the engagement with the. On the other hand, on the side of the copying machine body 1,
A pair of push pins 38 that push the front surface of the first idle gear 27 are provided, and the push pins 38 project toward the idle gear 27 from pin insertion holes 39 provided in the cover 33.

3 and 7, reference numeral 40 denotes a process positioning boss for positioning the frame 24.
As shown in FIG. 3, the cover 33 is provided with a hole 41 for inserting the other process positioning boss 40.

In the drive system connecting structure having such a structure, before the cartridge A is mounted on the copying machine main body 1, the drum gear 25 of the photosensitive drum 4 is the first idle gear 2.
7, the rotation of the photosensitive drum 4 is not drive-transmitted to the detection piece gear 26. Next, the frame 2
When 4 is attached to the copying machine main body 1, the push pin 38 on the main body 1 side slides the first idle gear 27 toward the drum gear 25 side against the urging force of the return spring 37.
As a result, the first idle gear 27 meshes with the drum gear 25 and the second idle gear 28, the rotation of the drum gear 25 is transmitted, and the rotational movement of the detection piece gear 26 in the frame 24 and the conveying screw piece of the cleaning device 10 is performed. Done.

As described above, the rotation of the photosensitive drum 4 and the rotation of the cleaning device 10 are possible within the drive system of the cartridge, but in the case where the detection piece gear 26 is switched by the rotation of the copying machine body 1, the cartridge A is driven. The system becomes rotatable for the first time when it is attached to the copying machine main body 1.
It is possible to prevent the rotation operation of the detection piece gear 26 by rotating the.

Further, in the mounted state in which the cartridge A is mounted in the copying machine main body 1, the detection piece gear 26 which is covered by the frame 24 and is not touched from the outside by driving can be operated. When the push pin 38 is provided on the cartridge A side, the gear system to be operated operates after the push pin 38, which is the protrusion on the copying machine main body 1 side, enters into the cartridge A and becomes operable. Compared with the above, the possibility that the user moves the position of the detection piece gear 26 with the cartridge A not mounted is reduced.

FIG. 9 shows that the old and new detection sensors 32 are turned on / off.
The mechanism to operate is shown. The actuator 31 is
A jam detection piece that is formed of a shaft-shaped body having a length that extends between the detection piece gear 26 and the detection piece operation slit 43 formed in the center of the sheet passing surface 42, and that projects from the detection piece operation slit 43 to the tip side. 31b is provided, and the jam detection piece 31b detects old and new of the photoconductor drum 4 and paper jam detection.

The actuator 31 detects the old and new of the photosensitive drum 4 during the pre-rotation operation by the main motor after the power source of the copying machine is turned on, and thereafter detects the jam of the paper P. In addition, after the power is turned on, the remaining paper in front is detected. Therefore, the ON state (without paper) and the OFF state (with paper) of the old and new detection sensor 32 are detected to determine whether or not to perform the pre-rotation of the main motor. to decide.

In this way, the detection piece gear 26 operates the actuator 31 during the pre-rotation of the copying machine.
The old and new detection of the photoconductor drum 4 is performed, and the detection piece gear 26 is at the process unit retreat position of the cartridge A during the copying operation. Therefore, the jam can be detected, and the one actuator 31 detects the jam and the photoconductor drum 4 is detected. It also serves as an old and new detection. Also, the photosensitive drum 4 is rotated before the power is turned on.
The old and new detections are performed and the jam is detected after the rotation before the power is turned on. Therefore, the single old and new detection sensor 32 can have two functions.

After the power is turned on, first the old and new detection sensor 3
Check the detection status of No. 2, and if it is ON, it means that the main motor is not rotating because the jam is displayed. If the old and new detection sensors 32 are not in the ON state, the main motor is rotated. If there is paper left over, the jam can be displayed without rotating the main motor to notify the user.

The time chart of FIG. 10 (A) shows the timing of determining the paper jam, stopping the pre-rotation of the main motor, and displaying the jam. Further, the time chart of FIG. 10 (B) shows the timing of the pre-rotation of the main motor after confirming that the old and new detection sensors 32 are OFF. In this way, it is possible to determine whether the jam is detected or whether the old and new photosensitive drums 4 are detected by the timing of the ON-OFF-ON timing of the jam detection and the new-old detection of the photosensitive drums 4.

[0045]

As described above, according to claim 1 of the present invention, a new / old detection mechanism is provided in the cartridge, and a detection member for detecting old / new of the cartridge,
A counter for displaying the degree of use of the cartridge, a reset member for resetting the counter, locking means for locking the detection member in the old position, and a hole of a specific shape provided in the frame of the cartridge for externally attaching the cartridge. And a lock releasing means for releasing the lock of the detection member by inserting the reset member from the cartridge, and the detection member is configured to return to the initial position after the lock is released. If you do not insert it, you cannot unlock the detection piece.

Therefore, in order to unlock the detection member, a dedicated reset member is necessary, the user cannot easily unlock the detection member, and the user is sure to prevent accidental operation. You can

According to a second aspect of the present invention, the locking means is provided with a latch member which engages with an intermittent gear provided integrally with the detection member in a state of preventing reverse rotation, and the detection member is a new detection member. A first elastic urging member for urging to move in the time position direction; further, a position where the latch member locks the detection member and a position where the lock to the detection member is released. A second elastic biasing member for biasing the latching member to be switchable is provided, and the resetting member pushes the latch member through the hole of the cartridge frame body so that the biasing force of the second elastic biasing member causes the latching member to move. Since the detection member is configured to return to the initial position, the lock is automatically returned to the original position by releasing the lock to the initial position (new state) by the first elastic biasing member means. It can be returned to location (initial position).

According to a third aspect of the present invention, a cartridge having process means incorporated therein and detachable from the main body of the electrophotographic apparatus,
And a new / old detection mechanism having a detection member provided in the cartridge for detecting old / new of the cartridge, and a drive system provided in the cartridge for switching a new / old detection position of the detection member. Since the system is supposed to be rotatable by being attached to the main body of the electrophotographic apparatus, the drive system of the detecting member is connected only after the cartridge is attached to the main body of the electrophotographic apparatus, so that the user etc. The detection member does not rotate even if the drum is rotated. In addition, since the detection member is hidden in the cartridge frame, the detection piece cannot be moved and altered.

According to a fifth aspect of the present invention, there is provided an operating member which interferes with the detecting member to perform the old and new detecting operation when the main body of the electrophotographic apparatus is rotated forward. It is configured to be moved to a position retracted from the means, and the jamming can be detected by the moving member during the main operation of the electrophotographic apparatus. Therefore, the existence of the moving member allows the old and new detection mechanism to detect the process old and new and jam detection. Can be combined with.

As a result, only one new and old detection sensor need be provided. That is, the rotation before turning on the power → new and old detection, and the rotation after turning before turning on the power → jam detection,
One old and new detection sensor will have two functions.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example of a copying machine according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a cartridge is being loaded into the copying machine.

FIG. 3 is an exploded perspective view showing a new / old detection mechanism of the cartridge.

FIG. 4 is an exploded perspective view showing a configuration of a detection piece gear.

FIG. 5 is an enlarged perspective view of an essential part of the detection piece gear before being unlatched.

FIG. 6 is an enlarged perspective view showing a reset state after releasing the latch.

FIG. 7 is a cross-sectional view of essential parts showing a state before mounting the cartridge in the copying machine main body 1 of the copying machine.

FIG. 8 is a cross-sectional view showing a state after the mounting.

FIG. 9 is a perspective view of a main part of a cartridge old and new detection sensor.

FIG. 10 is a time chart showing ON / OFF timings of a power supply, an old / new detection sensor, a main motor, and a jam display.

[Explanation of symbols]

 1 Copying Machine Copying Machine Main Body 1 4 Photosensitive Drum 8 Developing Cartridge 10 Cleaning Device 24 Frame 25 Drum Gear 26 Detection Piece Gear 27 First Idle Gear 29 Latch Lever 30 Spring 31 Actuator 32 Sensor 33 Cover 33a Slit 34 Reset Member 36 Spring Spring 38 Pushpin A cartridge

Claims (4)

[Claims] 1. An electrophotographic apparatus, comprising: a cartridge that incorporates process means and is detachably attached to an electrophotographic apparatus main body; and an old and new detection mechanism that determines whether or not the cartridge is new. A detection member provided in the cartridge for detecting old and new of the cartridge, a counter for displaying the usage degree of the cartridge, a reset member for resetting the counter, and the detection member locked at the old position. Locking means and lock releasing means for releasing the lock of the detection member by inserting the reset member from the outside of the cartridge into a hole of a specific shape provided in the frame of the cartridge, and the detection member after the lock is released. Is configured to return to the initial position. 2. The lock means includes a latch member that engages with an intermittent gear integrally provided with the detection member in a state of preventing reverse rotation, and the detection member moves the detection member in a new position direction. A first elastic biasing member that biases the latching member to switch between the position where the latch member locks the detection member and the position where the lock to the detection member is released. A second elastic urging member for urging the detection member is initialized by a urging force of the second elastic urging member by pushing the latch member through a hole of a specific shape of the cartridge frame by a reset member. The electrophotographic apparatus according to claim 1, wherein the electrophotographic apparatus is configured to return to the position. 3. A cartridge which incorporates process means and is detachable from the main body of an electrophotographic apparatus, a detection member provided in the cartridge for detecting old and new, and a detection member provided in the cartridge. An electrophotographic apparatus, comprising an old and new detection mechanism having a drive system for switching the old and new detection positions, and being rotatable when the drive system is attached to the main body of the electrophotographic apparatus. 4. An operating member is provided which interferes with the detecting member when the electrophotographic apparatus main body is rotated forward and performs the old and new detecting operations.
The jam detection can be performed by the operating member during the main operation of the electrophotographic apparatus, while the detection member is moved to a position retracted from the process means. An electrophotographic apparatus according to any one of 3 to 3.