JP2692005B2 - Image recording device - Google Patents

Description

The present invention relates to an image recording apparatus that records an image on a recording material, that is, a sheet material by a thermal transfer method, an inkjet method, or the like, or an image developed by toner on a sheet. The present invention relates to an image recording apparatus used for a monochromatic or color electrophotographic copying machine to be transferred, a color recording apparatus constituting an output section of a computer or a facsimile, and the like.

2. Description of the Related Art In an image recording apparatus of this type, a sheet material from a sheet material supply unit is carried on a sheet material carrier and conveyed to a recording position where an image is recorded and the recorded sheet material is separated. It is separated from the sheet material carrier by means. When such an image recording apparatus is continuously operated, after the preceding sheet material finishes the image recording operation, before the sheet material is discharged to the outside of the image forming apparatus, or the sheet material is Before the sheet reaches a predetermined stacking position in the image recording device, the subsequent sheet material is carried into the image recording device. This is because when the image recording process is continuously continued, the time for the image recording process is shortened and the work is efficiently performed. Therefore, when the image recording apparatus is continuously operated, a plurality of sheet materials are present on the sheet carrier in the apparatus.

For example, in a color electrophotographic image forming apparatus of a system in which an electrostatic latent image formed on a photoconductor is developed with colored toner and the toner images are transferred to a sheet material carried on a transfer drum in a multiple manner, When the sheet material is in the fixing unit corresponding to the final stage of the image forming process, the succeeding sheet material may be already loaded into the apparatus and exist on the transfer drum as the sheet material carrier.

Further, in an image forming apparatus that forms an image by a thermal transfer method or an inkjet method by supporting an image forming sheet material on a cylindrical rotating body as a sheet material supporting body, the preceding sheet material is separated from the cylindrical rotating body. Then, there is a case where the subsequent sheet material is already carried into the apparatus and is present on the cylindrical rotating body when it is in the carrying-out section for going out of the apparatus.

Further, in an image recording apparatus of a system in which a sheet material other than a sheet material for obtaining a final image such as a thermal ink sheet or a photosensitive master sheet is carried on a rotating body as a sheet material carrier, the preceding sheet material is In the case where the sheet material is in the transport path from the detached position to the predetermined stacking position, the succeeding sheet material may have already been loaded into the apparatus and exist on the rotating body.

Contrary to these examples, when the succeeding sheet material is on the rotating body, there is a case where the preceding succeeding sheet material for which recording is completed is on the discharge path.

Therefore, in such an image recording apparatus, when an abnormality such as a jam occurs in the sheet material on the conveyance path,
In addition to displaying the abnormality, all the driving parts such as the conveying means and the image forming recording means are immediately stopped to prompt the operator to take action to recover the operation.

However, in such an image recording apparatus, in the case where the sheet material in the conveyance path has a conveyance abnormality, the operator removes the sheet material having the conveyance abnormality and also the sheet material carrier. The upper sheet material cannot be used either and must be removed. Therefore, there have been the following problems conventionally.

The sheet material removing operation is complicated.

That is, the sheet material removing operation is repeated a plurality of times, and the plurality of staying sheet materials must be removed while confirming the staying positions, respectively, so that the sheet material removing operation is very complicated.

The life of the sheet material carrier is shortened.

That is, since the operator needs to touch the sheet material carrier during the sheet material removing operation as described above, the sheet material carrier is likely to be damaged.

Therefore, according to the present invention, in an image recording apparatus having a process of supporting a recording material, that is, a sheet material on a recording material carrier, that is, a sheet material carrier, there is no conveyance abnormality in the sheet material at a position other than the sheet material carrier. When it occurs, it is possible to easily separate and remove the sheet on the sheet material carrier from the sheet material carrier, and to allow the operator to process the jammed sheet material without touching the sheet material carrier. .

Means for Solving the Problems The above object can be completely achieved by the configuration of the present invention described below. That is, the present invention is a rotatable recording material carrier for carrying a recording material, and a transporting means for transporting the recording material, wherein an upstream transport part is provided upstream of the recording material transporting member in the recording material transport direction. Conveying means provided, an adsorption charging means for electrostatically adsorbing the recording material to the recording material carrier, a separation claw for separating the recording material from the recording material carrier,
An image recording apparatus for recording an image on a recording material carried by the recording material carrier, comprising: a detecting means for detecting an abnormal conveyance of the recording material in the recording material carrying means; When an abnormality is detected, the conveying operation of the upstream side conveying unit is stopped and the recording of the image on the recording material carried by the recording material carrier is interrupted, and the recording material carrying the recording material is carried out. The image recording apparatus is characterized in that the recording material carried on the recording material carrier is separated by the separating claw without stopping the rotation of the body.

Embodiment 1 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment in which the present invention is applied to a color electrophotographic image recording apparatus.

In the figure, reference numeral 21 denotes a paper feed cassette, and a transfer paper P as a sheet material (recording material) is stacked on the paper feed cassette. The drive of the paper feed roller 22 arranged above the end of the paper feed cassette 21 in the conveyance direction is controlled by a clutch mechanism (not shown), and when the rotational drive is performed, the transfer papers P in the paper feed cassette 21 are transferred one by one. It can be taken out in the transport direction. The transfer paper P taken out from the paper feed cassette 21 is guided to the registration roller pair 6a by guides 23 and 24. Further, a paper feed sensor 37 as a detection means for detecting passage of the transfer paper P is arranged at a predetermined position of the guides 23 and 24. The paper feed roller 22, the guides 23 and 24, the registration roller pair 6a and the guide 27 described below,
Including 28, first sheet conveying means (recording material conveying means)
Is configured.

The pair of registration rollers 6a controls the transfer of the transfer paper P that has been loaded into the apparatus from the paper feed unit. That is, the driving of the registration roller pair 6a is controlled by a clutch mechanism (not shown), and when the transfer drum 50 as a sheet material carrier (recording material carrier) rotates, the gripper 57 on the transfer drum 50 is rotated.
(See Fig. 1-a), when the transfer paper P is grabbed,
The transfer paper P is guided onto the transfer drum 50 via the guides 27 and 28. The gripper 57 is normally in a closed state by a biasing force such as a spring and is sunk at a position substantially the same as the outer peripheral position of the transfer drum 50. However, when gripping the transfer paper P, the transfer drum 50 is held. The gripper cams (not shown) arranged inside the shaft project outward in the radial direction.

An adsorption charger 51 is provided in the transfer drum 50,
This serves to electrostatically attract the transfer paper P to the surface of the transfer drum 50. The transfer charger 15 promotes the action of transferring the toner image formed on the photosensitive drum 1 to the transfer paper P gripped by the transfer drum 50. The transfer paper P is
After the image transfer is completed, the image is separated from the transfer drum by the separation claw 42 and guided to the fixing unit 18 by the conveyor belt 34.
The transfer paper P guided to the fixing unit 18 is discharged to a paper discharge tray 38 arranged outside the apparatus main body after the image is fixed by the fixing roller pair 18a. A paper ejection sensor 36 for detecting the ejection of the transfer paper is arranged at a predetermined position of the ejection portion of the fixing portion 18. A second sheet conveying means (recording material conveying means) is constituted by including the above-mentioned conveying belt 34.

 FIG. 2 shows an outline of the control system of the apparatus shown in FIG.

In the figure, reference numeral 41 is a CPU (central processing unit) that receives outputs from the paper discharge sensor 36, the paper feed sensor 37, etc., and controls each component described below. The CPU 41 has a readable / writable RAM (random access memory) 42 for storing the operation state of each unit and the like, and a read-only memory (ROM) 43 for the CPU 41 to control each component. At this time, a microinstruction group necessary for executing the control procedure as shown in FIGS. 3 to 7 is stored. In the present embodiment, the above-mentioned components are the registration roller drive circuit 44 for driving the registration roller pair 6a, the transfer drum drive circuit 45 for driving the transfer drum 50, the photosensitive drum drive circuit 46 for driving the photosensitive drum 1, and the conveyor belt. 34
And a fixing roller drive circuit 48 for driving the fixing roller pair 18a.

Next, the control process of this embodiment will be described with reference to the flowcharts of FIGS.

Here, FIG. 3 is a flow chart showing the main flow of the image recording sequence of the color electrophotographic image recording apparatus of FIG. 1 at the time of continuous monochromatic image formation, and FIG. 4 is a conveyance abnormality in the paper feeding section during image transfer. FIG. 5 is a flowchart showing an interrupt sequence when an abnormal conveyance occurs in the fixing unit during image transfer, and FIG. 6 is a flowchart showing an abnormal conveyance during the final single-color image formation. 3 is a flowchart showing an interrupt sequence of FIG.

First, when the image forming operation is started in step S100 of FIG. 3, the initial setting for the image forming process is performed in the next step S101. For example, the control variable n for counting the number of continuous image recordings is set to zero. Next, in step S102, the drive system is operated to rotate the photosensitive drum 1, the transfer drum 50, the conveyor belt 34, and the fixing roller pair 18a. At the same time, around the photosensitive drum 50, each operation for the electrophotographic process such as charging, exposure, and development is started.

Next, in step S103, the paper feed roller 22 starts to rotate, and the top transfer paper P ₁ of the transfer papers P loaded in the paper feed cassette 21 is carried into the image recording apparatus, and the guides 23 and 24 are fed. It is conveyed toward the registration roller pair 6a via. At this time, the paper feed sensor 37 detects whether or not the transfer paper P ₁ is being conveyed, and in step S104 it is determined whether or not the paper feed sensor 37 has been detected.

If there is a jam at the time of paper feeding and the paper feeding sensor 37 does not detect the transfer paper P ₁ within the predetermined time, the process branches to step S140, all driving operation units are immediately stopped, and the display device (step S141) An error message is displayed (not shown). Then, if the operator processes the jammed paper and resets the device,
The process returns from step S142 to step S102 to restart image recording.

On the other hand, if the paper feed sensor 37 detects the transfer paper P ₁ , the drive of the paper feed roller 22 is stopped in step S105. At this time,
The front end of the transfer paper P ₁ reaches the nip portion of the registration roller pair 6a. Next, in step S106, driving of the registration roller pair 6a is started at a predetermined timing according to the rotation angle of the transfer drum 50 so that the transfer paper P ₁ can reach the gripper 57 rotating with the transfer drum 29.

Then, in step S107, the front end of the transfer paper P ₁ is moved to the gripper 57.
When is gripped, the transfer paper P ₁ reaches the image transfer position (between the photosensitive drum 1 and the transfer charger 15) with the rotation of the transfer drum 50 while being attracted to the circumference of the transfer drum 50 by the charging action of the suction charger 51. To do. Next, in step S108, electric power is supplied to the transfer charger 32, so that image transfer is started. At this time, the trailing edge of the transfer paper P ₁ is
Since it has passed 6a, in step S109 the registration roller
25 and 26 stop.

Immediately after this, supply of the transfer paper P ₂ in the paper feed cassette 21 used for the second image recording is started in step S110. Next, in step S111, the paper feed sensor 37 determines whether or not the second sheet of transfer paper P ₂ has been supplied in a predetermined manner. If the transfer paper P ₂ causes a jam and the paper feed sensor 37 cannot detect the transfer paper P ₂ within a predetermined time, the process proceeds to the flow of FIG.

On the other hand, when the transfer paper P ₂ is detected by the paper feed sensor 37 within the predetermined time, the process proceeds to step S112, and the operation of the paper feed roller 27 for carrying in the transfer paper P ₂ is stopped. At this time, although the second half of the preceding transfer paper P ₁ on the transfer drum 50 is transferring the image, the front end of the transfer paper P ₁ is released from the gripper 57 after the transfer and separated from the transfer drum 50 in step S113. Starts and moves onto the conveyor belt 34. Then, in step S114,
Image transfer of the preceding transfer paper P ₁ is completed up to the rear end,
Following the transfer sheet P ₁ in step S115 is completely the transfer drum 50
Separate from At this time, the gripper 57, which rotates together with the transfer drum 50, is in a rotation position where it is possible to grip the subsequent transfer paper P ₂ .

Then, in step S116, the subsequent transfer paper P ₂ grippers
Driving of the registration roller pair 6a is started at a predetermined timing according to the rotation angle of the transfer drum 50 so as to reach 57. Further, when the grip of the transfer sheet P ₂ is completed in step S117, in the next step S118, the image transfer is started similarly to the case of the previous transfer sheet P ₁ . At this time, the preceding transfer paper P ₁ is conveyed by the conveyor belt 34 and enters the fixing unit 18.

Next, in step S119, the discharge sensor 36
5 determines whether or not the preceding transfer sheet P ₁ has been detected, thereby determining whether or not the transfer sheet P ₁ has jammed in the fixing unit 18, and if the discharge sensor 36 does not detect it, the transfer sheet P _{1 in} FIG. Move to the flow of. On the other hand, when the preceding transfer sheet P ₁ is detected by the sheet discharge sensor 36, the process proceeds to the next step S120.

In step S120, 1 is added to the above-mentioned control variable n to count (count) the number of image recordings. Thereafter, the preceding transfer sheet P ₁ is discharged to the tray 38. At this time, since the trailing edge of the subsequent transfer sheet P ₂ has passed the registration roller pair 6a, the registration roller pair 6a is stopped in step S121. To do.
In the next step S122, it is determined whether or not the number of image recordings has reached a predetermined number N, and if not, step S1.
Returning to step 10, the transfer sheet P for the next image recording is carried in, and the above-mentioned processes are repeated.

On the other hand, when the number of image recordings reaches the predetermined number N in step S122, the process goes to the next step S123. At this time, the latter half of the N-th transfer paper P on the transfer drum 50 is in the process of transferring an image, but the front end of the transfer paper P is released from the gripper 57 after the transfer and is transferred in step S123.
Separation from 50 begins. Then, in step S124, the transfer paper P
After the image transfer to the rear end of the
Then, the transfer paper P is completely separated from the transfer drum 50.

After that, the transfer paper P is conveyed to the fixing unit 18 by the conveyance belt 34 and the image is fixed. Next, in step S126, if the paper discharge sensor 36 detects the transfer paper P within a predetermined time, post-processing for completion of operation of the image recording apparatus is performed in step S127, and then the entire drive system is stopped in step S128. Then, the process proceeds to step S129 to end the continuous recording of images.

On the other hand, if the discharge of the transfer paper P is not confirmed in step S126, the process proceeds to step S150, and after stopping the entire drive system,
An error is displayed in the next step S151. Here, when the operator removes the transfer paper P in the fixing unit 18 and resets the apparatus, the process proceeds from step S152 to step S153, and again the photosensitive drum 1, the transfer drum 50, and the transfer drum 50 for the final image recording. The driving of the conveying belt 34 and the fixing roller pair 18 is started.

After that, the process proceeds to the image recording flow for only one sheet of transfer paper P shown in FIG. Steps S401 to S407 in FIG.
Each of the processes is the same as steps S103 to S109 when recording a plurality of images on the transfer paper P shown in FIG. Furthermore, each step S420 to S423 branched from step S402
Also, the same processing as steps S140 to S142 and S120 in FIG. 3 is performed.

On the other hand, when the apparatus normally operates up to step S407, the transfer paper P is transferred from the front end portion where the transfer is completed to the step S408.
Then, the separation is started from the transfer drum 50, and when the transfer is completed up to the rear end in the next step S409, the process returns to step S125 in FIG. 7 and the final image recording is performed again.

Next, during continuous image recording, that is, in the case where a conveyance abnormality such as a jam occurs in the paper feeding unit or the paper discharging unit in the loop between step S110 in FIG. 3 and step S122 in FIG. explain.

First, when the paper feed sensor 37 does not detect the transfer paper Pi shown in FIG. 1 within a predetermined time in step S111, the process proceeds to step S201 in FIG. In step S201, the driving of the paper feed roller 22 is immediately stopped so that the jammed transfer paper Pi does not wind around or enter an unintended place. Next, in step S202, the image transfer of the transfer paper Pi being transferred is interrupted, a delay operation for carrying the transfer paper Pi to the separation position is performed, and if this is completed, step S203,
And in S204, the transfer paper Pi is separated and conveyed from the transfer drum 50,
When the trailing edge of the transfer paper Pi rests on the conveyor belt, step S2
Stop all driving at 05. Then, in step S206, an error message is displayed to inform the operator that the paper feed cassette 21 or the like is a jam in a paper feed unit. Therefore, if the operator who sees the display removes the jammed paper on the paper feed unit and the conveyor belt 34 and resets it, steps S207 to S102.
Return to and resume work.

Therefore, the transfer paper Pi is transferred on the transfer drum 50 during transfer.
If the Pi + ₁ has a paper feed error in the paper feed section, the CPU4
According to the command of 1, the image transfer of the transfer paper Pi is interrupted, the transfer paper Pi is separated and conveyed from the transfer drum 50, and the entire drive system is stopped at the same time when the transfer paper Pi is completely placed on the conveyor belt. . Therefore, the operator only has to remove the jammed paper on the paper feed unit and the conveyor belt, and does not have to touch the transfer drum.

Next, in step S119, when the paper discharge sensor 36 does not detect the transfer paper Pi within the predetermined time, the step of the flow of FIG.
Move to S301.

In step S301, the fixing roller pair 18 is stopped so that the jammed transfer paper Pi does not adversely affect the fixing roller pair 18. Next, in step S302, the image transfer of the transfer paper Pi being transferred is interrupted, and a delay operation for carrying the transfer paper Pi to the separation position is performed. After this operation is completed, step S3
In S03 and S304, the sheet material is separated and conveyed from the transfer drum 50, and when the rear end of the transfer paper Pi is placed on the conveyor belt 34, the step S3 is performed.
Stop all driving at 05. Then, in step S306, an error message is displayed to inform the operator that there is a jam in the paper discharge unit. Therefore, if the operator who knows the jam removes the jammed paper from the discharge unit and the conveyor belt 34 and resets it, the operation proceeds from step S307 to step S308, restarts each drive, and can return to step S103.

Therefore, when the transfer paper Pi- ₁ preceding the transfer paper Pi during transfer on the transfer drum 50 causes a conveyance abnormality in the fixing unit 18,
The image transfer of the transfer paper Pi is interrupted, the transfer paper Pi is separated and conveyed, and the entire drive system is stopped at the same time when the transfer paper Pi is completely placed on the conveyor belt. Therefore, the operator does not have to touch the transfer drum by removing the jammed paper on the fixing unit and the conveyor belt.

In this embodiment, the case of continuous monochromatic image formation by the color electrophotographic image recording apparatus has been described above. However, when it is used for color image formation, multiple transfer of toner images of different colors is required for each image recording. Therefore, if a feeding error occurs in the paper feed unit or the paper discharge unit during image transfer, the remaining transfer that should be multiplexed is interrupted, and the operation of separating the transfer paper from the transfer drum is performed immediately. Even at the time of forming, the above-mentioned embodiment can be applied as it is. The separating operation of the transfer paper does not have to be completed, and the operator can grasp and process even if the separating operation is interrupted when only the leading edge of the paper is separated. Therefore, this case is also within the scope of the present invention.
Further, in the present embodiment, an example in which the jammed paper on the transfer drum is placed on the conveyance belt after jamming and is processed by the operator is shown, but the present invention is not limited to this, and the jam tray is easy for the operator to process. It may be switched to and carried out.

As described above, in the present embodiment, the example applied to the electrophotographic image recording apparatus having the transfer drum has been described, but the present invention is not limited to this, and a mechanism for supporting the sheet material on the sheet material carrier. If it is an image recording device having the above, it can be applied to the following devices. That is,
For example, a thermal transfer type image recording in which a transfer paper is carried on a cylindrical rotating platen, an ink sheet is brought into contact with the platen, and a thermal head melts the ink on the ink sheet to transfer the image from the back of the ink sheet. Ink jet type image recording device having a device or a similar platen, or an image recording device of a type in which a photosensitive master sheet or an ink sheet is carried on a rotating member and the image is transferred while being in contact with the recording sheet material while rotating it. Can be given. In these apparatuses, when the sheet material other than the image recording operation on the sheet material carrier causes a conveyance abnormality on another conveyance path, the image recording is immediately interrupted and All the driving may be stopped after the sheet material is separated and conveyed, and thus the object of the present invention can be achieved.

Embodiment 2 FIGS. 8 to 10 show another embodiment of the present invention.
Here, the transfer drum 50 is a front ring as shown in FIG.
The transfer sheet (not shown) is configured to have a cylindrical shape by 50a, a rear ring 50b, and their connecting members 50c. It is maintained in a cylindrical shape. Further, the front ring 50a is provided with a gear portion 50d, and by engaging the drive gear portion 1a provided at the end portion of the photosensitive drum 1 with the gear portion 50d, the transfer drum 50 is rotated around the central axis 62. Is rotated. The central shaft 62 is fixed to the swing plate 63, and the swing plate 63 is a fulcrum shaft.
It is swingably supported with respect to 61. The swing plate 63 is the eighth
As shown in FIGS. 9 and 10, the tension spring 79 is attached to the cam 64.
It is in contact with the power of. When a transfer drum release lever (not shown) that rotates integrally with the cam shaft 65 is rotated by the operator, the cam shaft 65 and the cam 64 rotate, and the swing plate 63 moves upward in FIG. Push 50 in the direction away from the photosensitive drum 1. When the transfer drum 50 is pushed up, its gear portion 50d is disengaged from the drive gear portion 1a and meshes with the handle gear 66 rotatably supported on the main body side, as shown in FIG. The handle gear 66 is adapted to rotate integrally with the handle shaft 77 and the handle 78.
Further, the rocking plate 63 can push up one end 83b of the interlocking arm 83 which can freely rock about the shaft 82, and as a result, the other end 83a of the interlocking arm 83 operates as shown in FIG. The iron core 67a of 67 can be pushed in.

On the other hand, the separation claw 42 has the longest claw 42a at its center,
The fulcrum shaft is arranged so that the shorter claws are gradually positioned toward the end, and the fulcrum shaft 84 rotates integrally with the fulcrum shaft 84.
It is stuck to 84. The fulcrum shaft 84 serves as a drive shaft for the separation claw 42, and is rotatably supported by the front and rear side plates 70, 71 of the main body.
An abutting roller 74, a roller shaft 75, and a roller arm 72 are fixed to this. Further, a release spring 85 is hooked on the roller arm 72, and the other end is hooked on the front side plate 70 of the main body to apply a force in the clockwise direction in the figure to the group of the roller arm 72 and the separation claw 42. . In this case, the release position of the roller arm 72 and the separation claw group 42 is determined by using the bent portion 70a provided on the front side plate 70 of the main body as a stopper. Further, a pressure spring 73 is hooked on the roller arm 72 at the position shown in FIGS. 8 and 9, and is elastically coupled to the iron core portion 67a of the solenoid.

 Next, the operation when using the above structure will be described.

During the copy sequence, the photosensitive drum 1 and the transfer drum 50 are in contact with each other as shown in FIG. 8, and the drive source (not shown)
The photosensitive drum 1 which has obtained the driving force in the direction of arrow transmits rotational drive to the transfer drum 50 via the gear portion 1a and the gear portion 50d. After the transfer of the final color is completed or before the leading edge of the transfer paper reaches the separation claw 42, the drive solenoid 67 is energized at a predetermined timing with a margin. The energized drive solenoid 67 applies a counterclockwise rotational force to the fulcrum shaft 84 via the pressure spring 73 and the roller arm 72. That force overcomes the force of the release spring 85, resulting in the abutting rollers 74
Rotates until it hits the front ring 50a (two-dot chain line position). At the leading end of the transfer sheet electrostatically adsorbed on the transfer sheet, a groove 50e is provided at the position of the transfer drum on the ring 50a, which corresponds to the position where the abutting roller 74 rotates while abutting. ing. That is,
When the abutting roller 74 passes through the groove 50e, the separation claw 42 (at least the long claw 42a) scoops the leading end of the transfer sheet to separate it from the transfer sheet. When such an operation is performed by the separation claw, a transfer sheet supporting unit (for example, a gripper) may or may not be provided.

If the transfer paper is electrostatically adsorbed on the transfer sheet as described above and a conveyance error occurs in another unit during multiplex or single-color transfer, the main body immediately stops all driving and notifies the operator of the jam position. . The operator removes the transfer paper at the jam position, and then the transfer drum release lever (not shown)
Rotate 180 ° in the direction of the arrow. This allows the cam 64
Moves the oscillating plate 63 upward, separates the transfer drum 50 from the photosensitive drum 1, and pushes the iron core portion of the solenoid 67 (waiting at the solid line position in FIG. 8) through the interlocking arm 83. Therefore, the abutting roller 74 abuts on the ring 50, and the relative positional relationship between the separating claw and the ring is positioned at a separable position. In addition, the transfer drum moved upward
The gear portion 50d of the gear 50 is disengaged from the photosensitive drum gear 1a, and now meshes with the handle gear 66. The gaps 1 and 1 shown in FIGS. 8 and 9 are set to a distance such that the tooth tips of the respective gears do not interfere with each other. The operator then turns the handle 78 in the direction of the arrow,
The transfer paper on the transfer drum is moved to the separation position, but the separation claw performs the same separation operation as in the normal copy sequence, so that the transfer paper is separated.

That is, the operator can remove the residual transfer paper on the transfer drum simply by turning the handle, and does not need to touch the transfer drum.

Further, if the transfer drum can be rotated by a manual operation as in the present embodiment, the transfer sheet material can be taken out of the transfer drum in most cases even when the conveyance abnormality occurs on the transfer drum. The residual transfer paper in the device can be easily removed without touching.

Embodiment 3 FIG. 11 and FIG. 12 show Embodiment 3 of the present invention. Here, the oscillating plate 63 is provided with an integrally molded sector gear 63a at the position shown in the figure, and is engaged with the cam gear 90. Further, the cam gear 90 is axially supported so as to rotate integrally with the cam 91, and the cam 91 has a structure capable of pressing the leaf spring 92 fixed on the abutting roller arm 72 as shown in FIG. There is. Thus, when the operator rotates the transfer drum release lever (not shown), the rotating claw can be used as a drive source to press the separation claw to the separation position,
An effect similar to that of the second embodiment can be expected.

EFFECTS OF THE INVENTION The present invention has been described in detail above, and in a state where a sheet material (recording material) is carried on a sheet material carrier (recording material carrier), conveyance abnormality ( When jamming occurs, the supply of the sheet material to the sheet material carrier is stopped and the sheet material carrier is driven so that the sheet material is unloaded from the sheet material carrier. It is possible to remove the sheet material on the outside of the sheet material carrier without touching the sheet material carrier, avoid the inconvenience that the operator scratches the sheet material carrier, and the sheet material removal operation is facilitated. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a color electrophotographic image forming apparatus showing an embodiment of the present invention. FIG. 1 (a) is a perspective view showing a part thereof. FIG. 2 is a block diagram showing an example of a control system for the apparatus shown in FIG. FIGS. 3 to 7 are flowcharts respectively showing the main flow of the image recording sequence and the flow of the interrupt sequence when forming a continuous monochrome image in the above apparatus. FIG. 8 is a schematic sectional view at the time of image transfer in another embodiment of the present invention. FIG. 9 is a schematic sectional view at the time of jamming. FIG. 10 is a partial perspective view of the same. FIG. 11 is a schematic sectional view at the time of image transfer in still another embodiment. FIG. 12 is a schematic sectional view at the time of jamming. 36: Paper discharge sensor 37: Paper feed sensor 41: CPU 7: Photosensitive drum 50: Transfer drum 42: Separation claw 66: Handle gear 77: Handle shaft 63: Oscillating plate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G03G 15/01 114 G03G 15/01 114B 15/16 15/16 (56) Reference JP-A-51 -87037 (JP, A) JP 52-11934 (JP, A) JP 57-181558 (JP, A) JP 60-216358 (JP, A) JP 62-58279 (JP, A) ) JP 61-198172 (JP, A) JP 62-285865 (JP, A) JP 62-283348 (JP, A) JP 2-131260 (JP, A) JP 1- 254986 (JP, A) Actually opened 61-143149 (JP, U) Actually opened 60-36651 (JP, U)

Claims (1)

(57) [Claims] 1. A rotatable recording material carrier for carrying a recording material, and a transporting means for transporting the recording material, the upstream transporting part being located upstream of the recording material transporting direction in the recording material transporting direction. Conveying means, adsorption charging means for electrostatically attracting the recording material to the recording material carrier, separation claws for separating the recording material from the recording material carrier, and abnormal conveyance of the recording material in the recording material conveying means. In the image recording apparatus for recording an image on the recording material carried by the recording material carrier, there is a detecting means for detecting Of the recording material carried on the recording material carrying body is stopped, and the separation claw is stopped without stopping the rotation of the recording material carrying body carrying the recording material. The recording material supported on the recording material carrier by An image recording device characterized by performing a recording material separating operation.