JPS61198172A - Image recording device - Google Patents

Abstract

PURPOSE:To utilize sheet materials effectively without any waste by carrying on and completing image forming process operation on a rotary carrier without instantaneous stopping if abnormality occurs to the conveyance of a sheet material, and carrying out sheet materials to an ordinary conveyance path after the abnormally-conveyed sheet material is handled. CONSTITUTION:If conveyance abnormality occurs to a transfer paper Pi feeding part while an image is transferred to transfer paper Pi on a transfer drum 29, the image transfer to the transfer paper Pi is carried on to the end and then all drive systems stop, thereby urging an operator to handle the abnormally-conveyed transfer paper. Then, the operator handles the transfer paper and also resets the device, and then the transfer paper Pi is separated from the transfer drum 29 and discharged to a paper discharge tray 35 after image fixation. Further, the device returns to a procedure for counting the remaining image recording.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an image recording apparatus having a rotating body that supports a sheet material such as recording paper.

More specifically, the present invention is applicable to, for example, a device that records an image on a sheet material carried on a cylindrical rotating body by a thermal transfer method or an inkjet method, or a device that develops an electrostatic latent image formed on a photoreceptor with toner. A color electrophotographic copying device that multiple-transfers images onto a sheet material carried on a transfer drum, or a color recording device that constitutes the output unit of a computer, facsimile, etc. based on the same method;
Alternatively, the present invention can be applied to a thermal transfer image recording device, an electrophotographic image recording device, etc., in which a rotating body carries a sheet-like member other than the sheet material from which the final image is obtained, such as a heat-sensitive ink sheet or a photosensitive master sheet.

[Prior Art] Conventionally, when an image forming apparatus that handles image forming sheet materials, ink sheet materials, etc. is operated continuously, after the preceding sheet material completes the image forming operation, the sheet material is transferred to the outside of the image forming apparatus. Before the sheet material is discharged or before the sheet material reaches a predetermined stacking position within the image forming apparatus, the subsequent sheet material is carried into the image forming conveyance path. it is,
This is to reduce the time required for image forming processing and to perform it efficiently when continuing the image forming process continuously. Therefore, when the image forming apparatus is operated continuously, a plurality of sheet materials are present on the conveyance path within the apparatus.

For example, in a color electrophotographic image forming apparatus in which a toner image obtained by developing an electrostatic latent image formed on a photoreceptor with colored toner is multiple-transferred onto a sheet material carried on a transfer drum, When the sheet material is in the fixing section corresponding to the final stage of the image forming process, a subsequent sheet material may already be carried into the apparatus and present on the transfer drum.

In addition, in an image forming apparatus in which an image forming sheet material is supported on a cylindrical rotating body and an image is formed by a thermal transfer method or an inkjet method, the preceding sheet material is separated from the cylindrical rotating body and transported out of the apparatus. In some cases, a subsequent sheet material has already been introduced into the device and is present on the cylindrical body.

Furthermore, in an image recording apparatus of a type in which a rotating body carries a sheet-like member other than the sheet material from which the final image is obtained, such as a heat-sensitive ink sheet or a photosensitive master sheet, a predetermined position is applied after the preceding sheet material leaves the rotating body. During the transport path towards the loading position of the machine, a subsequent sheet material may already have been introduced into the device and is present on the rotating body.

Further, contrary to these examples, when the succeeding sheet material is on the rotating body, there are cases where the preceding and subsequent sheet material, which has finished recording, is on the discharge path.

Therefore, in such an image forming apparatus, when an abnormality such as a jam occurs in the sheet material on the conveyance path, the abnormality is displayed and all driving parts such as the conveyance means and image forming recording means are shut down. It was designed to stop the system immediately and prompt the operator to take steps to restore operation.

However, in such an image forming apparatus, if a conveyance error occurs in the sheet material on the conveyance path, the operator must remove the sheet material that caused the conveyance error, and also remove the sheet material on the rotating body because it cannot be used. Both have to be removed, which has caused the following problems in the past.

■Sheet material removal operation is complicated.

That is, the sheet material removal operation is very complicated because the sheet material removal operation must be performed multiple times and furthermore, the plurality of retained sheet materials must be removed while confirming their respective retention positions.

■Removal of sheet material accumulated on the rotating body is a waste of resources.

That is, even if a conveyance abnormality occurs in the sheet material on the conveyance path, the sheet material on the rotating body during one image forming process will be removed, resulting in unnecessary consumption of the sheet material.

Removal of the sheet material during the imaging process on the zero rotation body is
This results in unnecessary consumption of ink, toner, etc.

That is, removing and discarding the sheet material during image formation results in unnecessary consumption of ink and toner used for forming one image.

When the sheet material is undergoing an image forming process on a zero-rotating body, once the process is interrupted, the image becomes defective and even if the image forming process is restarted, a satisfactory image cannot be obtained.

That is, for example, in an electrophotographic image forming apparatus, when the transfer drum is once stopped during the image forming process, the image transfer area corresponding to the rotational speed change at that time will be unevenly transferred due to the change. In addition, in image forming apparatuses that do not perform image formation by digitally forming dots on a sheet material, the dot spacing changes due to changes in rotational speed similar to those described above. This causes image unevenness.

[the purpose] Therefore, the purpose of the present invention is 1. l: In view of the above points.

In an image recording apparatus that has a process in which sheet material is supported on a rotating carrier, when a conveyance abnormality occurs in a sheet material other than the one on the rotating carrier, the image forming process operation on the one-rotating carrier continues without immediately stopping. After the conveyance is completed and the abnormal sheet material is disposed of by the operator, the sheet material on the rotary carrier is conveyed to the normal conveyance path, so that the sheet material can be used effectively without wasting it. An object of the present invention is to provide an image recording device that has the following features.

[Example] The present invention will be described in detail below with reference to one drawing.

FIG. 1 is a schematic configuration diagram when the present invention is applied to a color electrophotographic image recording apparatus.

In FIG. 1, reference numeral 21 denotes a paper feed cassette, in which transfer paper P is stacked. Paper feed roller 22 arranged at the upper part of the paper feed cassette 21 on the transport direction side
The drive is controlled by a clutch mechanism (not shown), and when the transfer paper P is rotated, the transfer paper P in the paper feed cassette 21 can be taken out one by one in the transport direction. Guides 23 and 24 are arranged and configured to guide transfer paper P taken out from paper feed cassette 21 to registration rollers 25 and 26. Paper feed sensors 37 are arranged at predetermined locations on the guides 23 and 24 to detect passage of the transfer paper P.

The registration rollers 25 and 2B control the conveyance of the transfer paper P carried in from the paper feeding section, that is, the registration rollers 2
5 and 2B are driven by a clutch mechanism (not shown), and when the gripper 30 on the rotating transfer drum 2a grips the transfer paper P, the transfer paper P is moved to the transfer drum 28 via the guides 27 and 28. The gripper 30 on the periphery of the transfer drum 29 that leads upward is normally in a closed state due to the urging force of a spring or the like, and is located at approximately the same position as the outer periphery of the transfer drum 28.
When gripping the transfer drum 28, the transfer drum 28 is opened radially outward by the action of a gripper cam (not shown) disposed inside the transfer drum 28.

The attraction charger 31 inside the transfer drum 29 promotes the action of electrostatically attracting the transfer paper P to the surface of the transfer drum 29. Further, the transfer charger 32 promotes the action of transferring the toner image formed on the photosensitive drum 33 to the transfer paper P gripped by the transfer drum 23. After the image transfer is completed, the transfer paper P is transferred to the fixing section 4 by the conveyor belt 34.
It leads to 0. The image on the transfer paper P guided to the fixing unit 40 is fixed by fixing rollers 38 and 39, and then the paper P is discharged to a paper discharge tray 35 arranged outside the main body of the apparatus. A paper discharge sensor 3B is arranged at a predetermined position of the discharge section of the fixing section 40 to detect discharge of the transfer paper.

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

In the figure, 41 is a CPU (Central Processing Unit) that receives the output of the paper feed sensor 37 etc. and controls each component, 42 is a readable/writable RAM (Random Access Memory), and the operating status of each part etc. Remember. 43 is a read-only memory (ROM), and CPυ4
A group of microinstructions necessary for sequentially notifying the CPU 41 of the control procedures shown in FIGS. 3 to 6, for example, when the CPU 1 controls each component is stored.

44 is a registration roller drive circuit that drives the registration rollers 25 and 26; 45 is a transfer drum drive circuit that drives the transfer drum 28; and 46 is a photosensitive drum drive circuit that drives the photosensitive drum 33. Furthermore, 47 is a conveyor belt drive circuit that drives the conveyor belt 34, and 48 is a fixing roller drive circuit that drives fixing rollers 38 and 39.

Next, the control process of this embodiment will be explained with reference to the flowcharts of FIGS. 3 to 6.

Here, FIG. 3 is a flowchart showing the main flow of the image recording sequence during continuous monochrome image formation in the color electrophotographic image recording apparatus of FIG. 1, and FIG. Flowchart showing the interrupt sequence when

FIG. 5 is a flowchart showing an interrupt sequence when a conveyance abnormality occurs in the fixing section during image transfer, and FIG. 6 is a flowchart showing an interrupt sequence when a conveyance abnormality occurs during the final monochrome image formation.

First, when the image forming operation is started in step 100 in FIG. 3, initial settings for the image forming process are made in the first step 101. For example, the control variable n for counting the number of consecutive image recordings is set to zero. to 0 then step 10
2, the drive system is operated, and the photosensitive drum 33. Transfer drum 2
8. Conveyor belt 34. At the same time as the fixing rollers 38 and 38 rotate, around the photosensitive drum 33,
Each operation for the electrophotographic process such as charging, exposure, and development is started.

Next, in step 103, the paper feed roller 22 starts rotating.
The topmost transfer paper PL among the transfer papers P stacked in the paper feed cassette 21 is carried into the image recording apparatus, and the guide 2
3 and 24 toward the registration rollers 25 and 2B. At this time, the paper feed sensor 37 detects whether or not the transfer paper PI is being conveyed, and step 10
In step 4, it is determined whether or not the paper feed sensor 37 has detected the paper feed sensor.

If there is a jam during paper feeding and the paper feed sensor 37 does not detect the transfer paper P within a predetermined time, step 14
Branch to 0, immediately stop all drive operation parts, and proceed to step 14.
An error message is displayed on a display (not shown) in step 1. After that, the operator disposes of the jammed paper and resets the device.
The process returns from step 142 to step 102 to resume image recording.

On the other hand, if the paper feed sensor 37 detects the transfer paper P1, the drive of the paper feed roller 22 is stopped in step 105. At this time, transfer paper P! The tips of the registration rollers 25 and 2
Next, in step 106, the registration roller 25 is moved at a predetermined timing according to the rotation angle of the transfer drum 2 so that the transfer paper p+ can reach the gripper 30 rotating together with the transfer drum 28. ,2
Start driving B.

Next, in step 107, when the gripper 30 grips the leading edge of the transfer paper PI, the transfer paper P1 is moved to the image transfer position (( (between the photosensitive drum 33 and the transfer charger 32) Next, in step 108, power is supplied to the transfer charger 32, and one image transfer is started. At this time, the rear end of the transfer paper PI has passed through the registration rollers 25 and 28, so
At step 109, the registration rollers 25 and 2B stop.

Immediately after this, feeding of the transfer paper P2 in the paper feed cassette 21 used for the second image recording is started in step 110.Next, in step 111, the paper feed sensor 3
It is determined whether the second sheet of transfer paper P has been supplied as specified. If the transfer paper P2 jams and the paper feed sensor 37 cannot detect the transfer paper P2 within a predetermined period of time, the process moves to the flow shown in FIG. 4.

On the other hand, if the transfer paper 22 is detected by the paper feed sensor 37 within the predetermined time, the process moves to step +12 and the operation of the paper feed rollers 25 and 2B for carrying in the transfer paper P2 is stopped.

At this time, the image is being transferred to the latter half of the transfer paper ρ1 on the preceding transfer drum 28, but the leading edge thereof is released from the gripper 30 after the transfer and is separated from the transfer drum 29 in step 113. Then, in step 114, image transfer is completed on the preceding transfer paper P1 up to its rear end, and in the next step 115, the transfer paper pl is completely separated from the transfer drum 29. At this time, the gripper 30, which rotates together with the transfer drum 29, is at a rotational position that allows it to grip the subsequent transfer paper P2.

Next, in step 11B, the registration rollers 25.2 are moved at a predetermined timing according to the rotation angle of the transfer drum 29 so that the subsequent transfer paper P2 can reach the gripper 30.
Start driving 13. Further, when the gripping of the transfer paper P2 is completed in step 117, image transfer is started in the next step 11B in the same manner as in the previous case of the transfer paper P2. At this time, the preceding transfer paper PI is transported by the transport belt 34 and enters the fixing section 40 .

Next, in step tta, the paper ejection sensor 3 is activated within a predetermined time.
6 detects the leading transfer paper Px 1. By determining whether or not the transfer paper P1 has jammed in the fixing unit 40, it is determined whether or not the transfer paper P1 has jammed in the fixing unit 40. If the paper discharge sensor 36 does not detect a jam, the process moves to the flow shown in FIG. On the other hand, when the preceding transfer paper PI is detected by the paper discharge sensor 3B, the next step 120 is performed.
Move to.

In step 120, 1 is added to the control variable n mentioned above, and the number of times of image recording is counted.

Thereafter, the preceding transfer paper P is discharged to the tray 35. At this time, the trailing edge of the subsequent transfer paper P2 is placed on the registration roller 2.
5 and 28, the registration rollers 25 and 2B are stopped in step 121. In the next step 122, it is determined whether the number of image recordings has reached a predetermined number N, and if it has not reached the predetermined number N, Then, the process returns to step 110, transfer paper P for next image recording is carried in, and each process described above is repeated.

On the other hand, when one image recording reaches a predetermined number N in step 122, the process proceeds to step 123, which is the fifth step. At this time, the image is being transferred to the latter half of the N-th transfer paper pN of the transfer drum 29E-, but the leading edge of this transfer paper pN is released from the gripper 30 after the transfer, and step 12
Separation from the transfer drum 29 begins at step 3.0 Next, at step 124, the image transfer is completed to the rear end of the transfer paper pN, and at the first step 125, the transfer paper PN is completely separated from the transfer drum 29.

Thereafter, the transfer paper pN is transferred to the fixing section 4 by the conveyor belt 34.
0, where the image is fixed, then step 126
In step 127, if the paper ejection sensor 3B detects the transfer paper pN within a predetermined time, post-processing is performed to complete the operation of the image recording device, and then in the next step 128, the entire drive system is stopped, and step Moving to 12θ, continuous recording of images is completed.

On the other hand, if the ejection of the transfer paper pN is not confirmed in step 12B, the process moves to step 150, and after stopping the entire drive system, an error message is displayed in the next step 151. Here, when the operator removes the transfer paper PN in the fixing section 40 and resets the apparatus, the process moves from step 152 to step 153, and the photosensitive drum 33. Transfer drum 29. Conveyor belt 34. Fixing roller 38.39
Start each drive.

Thereafter, the flow shifts to the image recording flow for only one sheet of transfer paper P shown in FIG. Steps 401 to 1 and N in FIG.
Each process in step 407 is similar to steps 103 to 10 when recording images on multiple sheets of transfer paper p shown in FIG.
This is the same process as 8. moreover.

Each step 420 to 423 branched from step 402
Also performs the same processing as steps 140-142 and 120 in FIG.

On the other hand, if the apparatus operates normally up to step 407, the transfer paper P is moved from the leading end where the transfer has been completed to the stay 4.
At step 08, separation is started from the transfer drum 29, and at the next step 409, transfer is completed to the rear end (f), and the process returns to step 125 in FIG. 3 to redo the final image recording.

Next, a case will be described below in which a conveyance abnormality such as a jam occurs in the paper feed section or the paper discharge section during continuous image recording, that is, within the loop between step 110 and step 122 in FIG.

First, in step 111, when the paper feed sensor 37 does not detect the transfer paper P1 shown in FIG. 1 within a predetermined time,
The process moves to step 201 in FIG.

In step 201, the drive of the paper feed roller 22 is immediately stopped to prevent the jammed transfer paper PL from wrapping around or entering an unintended area.Next, in step 202, the image transfer on the transfer paper Pi that is being transferred is performed. A delay operation is performed to continue and complete the transfer, and when this is completed, the power supply to the transfer charger is stopped in step 203 to complete the transfer. After that, in step 204, the photosensitive drum 3
3. After all driving of the transfer drum 29, etc. is stopped, an error message is displayed on the tape 205 and the operator is prompted to remove the paper feed cassette 21.
Notifies you that there is a jam in the paper feed section.

Therefore, if the operator who sees this display disposes of the jammed paper and resets the device, step 20B will be followed by step 2.
07, and in step 207, the photosensitive drum 33. Transfer drum 28. Conveyor belt 34. Start driving each of the fixing rollers 38 and 39. After separating the transfer paper Pi on the transfer drum 2B in steps 208 to 208, the conveyor belt 34
The image is transported to the fixing section 40 by.

Next, if the paper discharge sensor 38 detects the transfer paper Pi in step 210, 1 is added to the control variable n described above in step 211.

On the other hand, if the paper ejection sensor 38 does not detect the transfer paper Pi in step 210, the 0th order steps 210 to 213, which proceed to step 210, are step 150 shown in FIG.
~! The processing procedure is similar to step 53, and after each of these processes is performed, the process moves to step 212. Therefore, the operation of adding 1 to the control variable n is not performed.

Then, in step 212, the remaining number of image recordings is 2.
If the remaining number of image recordings is 1, the process returns to step 103 in FIG. 3 and repeats the image forming procedure described above. On the other hand, if the remaining number of image recordings is 1, the process moves to the flow in FIG. 6, and then from step 409. The process moves to step 125 in FIG. 3 and returns to the original flow.

Therefore, when a conveyance abnormality occurs in the transfer paper pt paper feeding section while the transfer paper Pi is being transferred on the transfer drum 28,
The image transfer operation on the transfer paper Pi continues until the transfer is completed, and then the entire drive system is stopped and the operator is prompted to dispose of the transfer paper that is abnormally conveyed, and
When the operator processes the transfer paper and resets the apparatus, the transfer paper Pi is separated from the transfer drum 29 and discharged to the paper discharge tray 35 after the image is fixed thereon. The apparatus then returns to the procedure for recording the remaining number of images.

Next, in step 119, if the paper ejection sensor 38 does not detect the transfer paper Pi within the predetermined time, the process moves to step 301 in the flowchart of FIG.

In step 301, the fixing rollers 38 and 39 are stopped to prevent the jammed transfer paper Pi from having an adverse effect on the fixing rollers 38 and 313.Next, step 302
In step 303, a delay operation is performed to continue and complete the image transfer on the transfer paper Pi that is being transferred, and when this operation is completed, in the next step 303, the power supply to the transfer charger is stopped and the transfer is completed. .

Thereafter, in step 304, the photosensitive drum 33. After all driving of the transfer drum 29 and the like is stopped, an error message is displayed in step 305 to inform the operator that there is a jam in the paper discharge section. Therefore, if the operator who knows about the jam disposes of the jammed paper and resets the device, the process moves from step 306 to step 307, and the transfer paper Pi that has completed image transfer is
The photosensitive drum 33. Transfer drum 28. Conveyor belt 34. Each drive of the fixing rollers 38 and 39 is started. Then, in steps 308 and 308, the transfer drum 2
After the transfer paper Pi on the paper 8 is separated, it is transported to the fixing section 40 by the transport belt 34.

Next, if the paper discharge sensor 3B detects the transfer paper P1 in step 310, 1 is added to the control variable n in step 311, and the number of image recordings is updated. On the other hand, if the paper ejection sensor 3B does not detect the transfer paper Pi in step 310, step 3
Move to 20. Here, steps 320 to 323 are the third
This is the same processing procedure as step 15G-153 in the figure,
The process moves to step 312. Therefore, the operation of adding 1 to the control variable n as described above is not performed.

In step 312, if the remaining number of image recordings is two or more, the process returns to step 103 in FIG. 3 and the above-described image forming procedure is repeated; on the other hand, if the remaining number of image recordings is one, the process shown in FIG. After moving to the flow, the process moves from step 408 to step 125 in FIG. 3, and returns to the original flow.

Therefore, when the preceding transfer paper Pi has a conveyance abnormality in the fixing section 40 while the transfer paper Pi is being transferred on the transfer drum 29, the image transfer operation of the transfer paper Pi continues until the transfer is completed. Thereafter, the entire drive system is stopped to prompt the operator to process the abnormally conveyed paper, and when the operator processes the transfer paper and resets the apparatus, the transfer paper Pi is transferred from the transfer drum 29. After the paper is separated and the image is fixed, it is discharged to the paper discharge tray 35. The apparatus then returns to the procedure for recording the remaining number of images.

In this way, the present embodiment has been described for the case of continuous monochrome image formation using a color electrophotographic image recording apparatus.

However, when used for color image formation, multiple transfers of toner images of different colors are required for each image recording.

Therefore, if a conveyance abnormality occurs in the paper feed section or paper ejection section during transfer of one image, the transfer should be continued until the remaining multiple transfers, that is, the transfer of all remaining images of different colors, are completed. Then, even when forming a color image, the above-described embodiment can be applied as is.

However, it is also possible to temporarily complete the transfer of only the image of the color in which the conveyance abnormality occurred, and then perform the image transfer of the remaining colors to be multiplexed after the jam has been cleared.In this case, the steps shown in FIG. Between 207 and 208, the fifth
Step 30 in the diagram? It is only necessary to add a multiple transfer step between 308 and 308. In this way, while achieving the object of the present invention, the time from when a conveyance abnormality occurs to when the drive system is stopped can be reduced by the multiple transfer step. It is possible to minimize the situation where the drive continues with the abnormal transfer paper left unattended.

Furthermore, in this embodiment, even if a conveyance abnormality occurs on either side of the transfer drum, the so-called paper feeding section on the upstream side or the fixing section on the downstream side, image transfer is continued and the drive system is turned off after the image transfer is completed. Although the transfer is stopped, for example, the transfer may be continued until the transfer paper being transferred is fixed and ejected only when a conveyance abnormality occurs on the upstream side.

Furthermore, although the error display in this embodiment is performed after the drive system is stopped, it may also be performed immediately after the branching step in which an error is determined.

As described above, in this embodiment, the present invention is applied to an electrophotographic image recording apparatus having a transfer drum. However, the present invention is not limited to this, and the present invention is not limited to this. If the image recording apparatus has a mechanism for - A thermal transfer type image recording device in which an image is transferred by melting the ink on an ink sheet using a head, an inkjet type image recording device having a similar platen, or a photosensitive master sheet or ink sheet supported on a rotating body. Record the sea L 廿σH 凉娃 or A (G, mosquito 赫i,
This is an image recording apparatus, etc., in which the overlapping position is increased by one step. In these q devices, when a conveyance error occurs on a different conveyance path for a sheet material other than one in which the image recording operation is being performed on the carrier H, the operation is continued until a series of image recording operations are completed. If so, the object of the present invention can be achieved.

[Effects] As explained above, according to the present invention, when a conveyance abnormality occurs in a sheet material other than the one on the rotary carrier, the image forming process operation on the rotary carrier can be continued without immediately stopping. After the conveyance is completed and the abnormally conveyed sheet material is disposed of by the operator, the sheet material on the rotary carrier is conveyed to the normal conveyance path, so that the sheet material can be used effectively without wasting it.

Furthermore, according to the present embodiment described above, the following effects are achieved.

(2) Since it is only necessary to remove the sheet material in which the conveyance abnormality has occurred, there is no need to remove the sheet material on the rotary carrier, and the sheet material removal work is easy.

■ Even when a conveyance error occurs, there is no need to remove the sheet material on the rotating carrier as in the past, so the sheet material during image formation can be used effectively without wasting it, making resources more efficient. It will be used.

■Since the sheet material during image formation can be used effectively, wasteful consumption of toner, ink, etc. for image formation can be prevented.

(2) When a conveyance abnormality occurs, the image forming operation is continued until the series of image formation is completed, so it is possible to prevent image unevenness that would occur if the image forming operation was immediately stopped.

■Transferred images using toner before fixing tend to scatter, and removing the transfer paper could contaminate the area around the transfer drum, etc., but by eliminating the need to remove the transfer paper, this contamination can be reduced. It disappears.

[Brief explanation of drawings]

1 is a schematic configuration diagram of a color electrophotographic image recording device to which the present invention is applied; FIG. 2 is a block diagram showing an example of a control system of the device in FIG. 1; FIG. 3 is a color electrophotographic image recording device shown in FIG. 1. A flowchart showing the main flow of the image recording sequence during continuous monochrome image formation by the image recording device. Fig. 4 is a flowchart showing the interrupt sequence when a conveyance abnormality occurs in the paper feeding section during image transfer. Fig. 5 FIG. 6 is a flowchart showing an interrupt sequence when a conveyance abnormality occurs in the fixing section during transfer. FIG. 6 is a flowchart showing an interrupt sequence when a conveyance abnormality occurs during the final monochrome image formation. P... Transfer paper, 25.28... Registration roller. 23... Transfer drum, 33... Photosensitive drum, 34... Conveyance belt, 3B... Paper discharge sensor, 37... Paper feed sensor, 40... Fixing unit. 41...CPU, 42...RAM, 43...ROM. Figure 6

Claims (1)

[Scope of Claims] 1) A rotatable carrier for supporting a sheet material, a recording means for recording an image on the sheet material supported by the carrier, and a conveyor for transporting the sheet material toward the carrier. a conveyance means for separating the recorded sheet material from the carrier and conveying it; and a detection means for detecting a conveyance abnormality of the sheet material being conveyed by the conveyance means during recording by the recording means; and a control means for controlling the recording means to stop the conveyance operation of the conveyance means and to continue the recording operation of the recording means when an abnormality in conveyance of the sheet material is detected by the detection means. Features of the image recording device. 2) The image recording apparatus according to claim 1, wherein the control means controls the recording means to complete the first half of the recording operation when the conveyance abnormality occurs. 3) The image recording apparatus according to claim 1, wherein the control means controls the conveyance means to convey the sheet material on the carrier after the conveyance abnormality is canceled. Device.