JPS61292163A - Image recording device - Google Patents

Abstract

PURPOSE:To prevent a fixing failure by providing the first control means for continuing and ending a transfer operation of a toner picture image with respect to a sheet material on a carrying body at the time of the carrying abnormality of a sheet material, and the second control means for holding the sheet material in a prescribed area until a fixing temperature becomes a prescribed value, when restarting the operation. CONSTITUTION:For instance, when a transfer paper Pi is transferring a picture image of the first color on a transfer drum 29, in case when a transfer paper Pi-1 has generated a carrying abnormality in a fixing part 43, an image recording device stops an electric conduction of all driving systems and a heater of the fixing part 43 after the picture image transfer of the first color has been ended. When the transfer paper Pi-1 is processed during the stop and an operation of the device is reset, the device transfers a picture image of the remaining color to the transfer paper Pi, and thereafter, carries the transfer paper to the fixing part 43 by a carrying belt 34. Also, the device detects a temperature of the device of fixing part 43 on the way, carries the transfer paper Pi into the fixing part in case of a suitable temperature, and in case of an unsuitable temperature, the transfer paper Pi is held on the carrying belt 34 until said temperature becomes a suitable temperature, and thereafter, carried into the fixing part 43. In this way, a fixing failure of a sheet material can be prevented.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention develops an electrostatic latent image formed on a photoreceptor with chargeable thermofusible fine particles, and transfers the developed image to a transfer drum. The present invention relates to an electrophotographic image recording apparatus that fixes an image by a heat fixing method after transferring the image to a supported sheet material.

More specifically, the present invention relates to a color electrophotographic image recording device that transfers multiple colored developed images, or an electrophotographic image recording device that forms images on both the front and back sides of a sheet material using a transfer drum and a sheet material reversing mechanism. This can be applied to recording devices, etc.

[Summary of disclosure]

This specification and the drawings describe an image recording apparatus in which when a conveyance abnormality occurs in a sheet material other than the transfer drum, the image transfer on the transfer drum is continuously completed without immediately stopping, and the conveyance abnormality is prevented. After the sheet material has been processed, when the fixing temperature of the fixing means reaches a predetermined value, the sheet material on the transfer drum is guided to the fixing means and fixed, thereby causing defective fixing of the sheet material on the transfer drum. This makes it possible to discharge waste in a time-efficient manner.

[Conventional technology]

Conventionally, when an image forming apparatus that handles image forming sheet materials is operated continuously, after the preceding sheet material has completed its image forming operation and before that sheet material is discharged outside the image forming apparatus, or when the sheet material is The subsequent sheet material is carried into the image forming conveyance path before the sheet material reaches a predetermined stacking position within the image forming apparatus. This is for the purpose of reducing the time required for image forming processing and efficiently performing the image forming process 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 to be transferred is in the fixing section corresponding to the final stage of the image forming process, the subsequent sheet material may have already been carried into the apparatus and is present on the transfer drum 42.

Further, contrary to the above example, when the preceding sheet material is on the transfer drum, the following sheet material may be on the carry-in path.

Therefore, when a conveyance abnormality occurs in a sheet material existing other than on a rotating carrier such as a transfer drum, the image forming process operation on that rotating carrier is continued and completed without immediately stopping. After the abnormally conveyed sheet material is processed 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. A device can be considered.

That is, when the sheet material detection means detects an abnormality in conveyance of the sheet material while the rotary carrier is rotating to perform an image forming operation, the rotation of the rotary carrier is continued until the image forming operation is completed. An image recording apparatus can be considered that has a control means for controlling the sheet material on the rotary carrier to be carried out to the regular conveyance path -L when the rotary carrier is then stopped and the rotary carrier is rotated again.

By the way, conventional electrophotographic image recording apparatuses generally have a heat fixing section downstream of the conveyance path with respect to the rotary carrier, that is, the transfer drum. This heat fixing section is normally heated to a constant temperature by a heater, and when handling a jam, the heater is often turned off to prevent the operator from being energized. Almost at the same time as the energization was started, the sheet material on the transfer drum 1 was conveyed to the regular conveyance path 2.

[Problem that the invention seeks to solve]

However, such an apparatus has the following problem in the sequence after jam processing when a conveyance abnormality occurs in a sheet material on a conveyance path other than the transfer drum.

That is, since the fixing heater is generally not energized while the jammed sheet material is being removed, the temperature of the fixing means decreases.

In addition, when the sheet material on the transfer drum is separated and reaches the fixing means after the operation of the image recording device is reset after the work of removing the jammed sheet material is finished, the fixing temperature of the fixing means is set to a level at which fixing is possible. Since the temperature often does not reach the temperature range, fusing failure occurs.

Furthermore, in the case of an electrophotographic color image recording device, one layer of toner in a transferred image becomes thick due to multiple transfers, so if the fixing temperature is low, the upper layer of toner that contacts the fixing roller will melt, but the lower layer will melt. Toner does not melt. For this reason,
A so-called low-temperature offset occurs in which the entire toner layer is transferred to the fixing roller without being fixed to the sheet material, thereby destroying the image.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to allow an image recording apparatus having a transfer drum to continue and complete image transfer on the transfer drum without immediately stopping when a conveyance abnormality occurs in a sheet material other than the one on the transfer drum; After the abnormally conveyed sheet material is processed, when the fixing temperature of the fixing means reaches a predetermined value, the sheet material on the transfer drum is guided to the fixing means and fixed, and the sheet material on the transfer drum is fixed. An object of the present invention is to provide an image recording device that can perform time-efficient ejection without causing defects.

[Means for solving problems]

In order to achieve such an object, the present invention provides a rotatable carrier that supports a sheet material and transfers a toner image to the sheet material; a fixing means that fixes the toner image transferred to the sheet material; temperature detection means for detecting the fixing temperature of the fixing means; a conveying means for conveying the sheet material toward the carrier and conveying the sheet material from the carrier to the fixing means; When there is a conveyance abnormality in the sheet material being conveyed by the means,
a first control means for continuing and then terminating the transfer operation of the toner image onto the sheet material present on the carrier-L; and a temperature detecting means for restarting the operation of the carrier and the fixing means; and a second control means for controlling the sheet material to wait in a predetermined range until the detected fixing temperature of the fixing means reaches a predetermined value.

[Function] That is, the present invention continues and completes the toner image transfer operation for the sheet material present on the carrier even if a conveyance abnormality occurs in the sheet material being conveyed by the conveyance means. When the fixing means resumes operation, the sheet material on the carrier is guided to the fixing means and fixed when the fixing temperature reaches a predetermined value.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings.

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 of the paper feed cassette 2! is controlled by a clutch mechanism (not shown), and when it is rotated, the paper feed cassette 2! The transfer paper P inside can be taken out one by one in the conveyance direction. The guides 23 and 24 are arranged so as to guide the transfer paper P taken out from the paper feed force roller 21 to the registration rollers 25 and 2B. 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 feed section. That is, registration roller 2
5 and 2B are driven by a clutch mechanism (not shown), and when the gripper 30 on the rotating transfer drum 29 grips the transfer paper P, the transfer paper P is moved to the transfer drum 29 via the guides 27 and 28. lead upwards. The gripper 30 on the circumference -F of the transfer drum 29 is normally in a closed state due to a biasing force such as a spring, and the gripper 30 on the circumference -F of the transfer drum 29
The position is approximately the same as the outer circumference of the transfer paper Pi÷
1, the transfer drum 28 is opened radially outward by the action of a gripper cam (not shown) arranged inside the transfer drum 28.

The attraction charger 31 inside the transfer drum 28 promotes the action of electrostatically attracting the transfer paper P to the surface of the transfer drum 28 . 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 28.

At the end of image transfer, the transfer paper P is separated from the transfer drum 29 and conveyed to the fixing section 43 by the conveyance belt 34. The driving force of the conveyor belt 34 is transmitted from the drive source to the crawler.
The signal is transmitted via a two-way mechanism, and its drive is controlled. Further, the conveyor belt 34 has a length capable of carrying the transfer paper to be used over its entire length.

The fixing unit 43 includes fixing rollers 38 and 39 . It is composed of a paper discharge sensor 3B, a temperature sensor 40, and the like. Fixing heaters 41 and 42 are provided in the air portions of fixing rollers 38 and 39, respectively. Fixing rollers 38 and 3
The driving force of No. 8 is transmitted from the driving source via the clutch mechanism, and the driving thereof is controlled.

The fixing heaters 41 and 42 are connected to the corresponding fixing roller 38.
and 39 are heated, and the energization state is controlled ft1J so that the temperature is constant, and when a conveyance abnormality or the like occurs in the fixing section 43, the energization is completely stopped.

The transfer paper P on which the image has been fixed by the fixing unit 43 is transferred to the paper discharge sensor 3
A paper output tray 35 that passes through B and is placed outside the main body of the apparatus.
is discharged to.

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

In the figure, 501 is a CPU (Central Processing Unit) that receives output from the paper feed sensor 37 etc. and controls each component, 503 is a readable/writable RAM (Random Access Memory), and the operating status of each part is etc. to be memorized. 502 is a read-only memory (ROM), and C
For example, when the PU 501 controls each component,
A group of microinstructions necessary for sequentially notifying the CPU 501 of the control procedure shown in FIG. 5 is stored.

505 to 507 are a paper feed sensor 37, a paper discharge sensor 36,
and a comparator that binarizes the detection output from the temperature sensor 40.

508 to 512 are paper feeding roller clutch 515, registration roller clutch 51B, fixing roller clutch 518,
This is a driver that drives the conveyor belt clutch 518 and drum motor 520, respectively.

521 is an image forming unit 521 that performs other image forming operations.
, 522 is a clock pulse generating means 522 that generates a signal synchronized with the rotation of the photosensitive drum 33.

Further, 523 is a heater control unit that performs energization and de-energization of the fixing heaters 41 and 42, and controls the temperature during energization.

Further, each of these components is electrically connected via an I10 boat. The sequence of the apparatus of this embodiment proceeds by controlling each driver based on a signal from the clock pulse generating means 522, as will be described later.

Next, the control process of this embodiment will be explained with reference to the flowcharts of FIGS. 3 to 5.

Here, FIG. 3 is a flowchart showing the main flow of the image recording sequence during continuous image formation in the color electrophotographic image recording apparatus shown in FIG. 1, and FIG. FIG. 5 is a flowchart showing the interrupt sequence when a conveyance abnormality occurs in the fixing section during image transfer.

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 next step 101. For example, the control variable n for counting the number of consecutive image recordings is set to zero. Make it. Next step 10
2, the drive system is operated, and the photosensitive drum 33 and transfer drum 2
9. The conveyor belt 34 and fixing rollers 38 and 38 are rotated. At the same time, 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.
Transfer paper P1, which is the topmost paper among the transfer papers P stacked in paper feed force cera) 21, is carried into the image recording apparatus, and the guide 2
3 and 24 toward the registration rollers 25° 2B. At this time, the transfer paper P1 is detected by the paper feed sensor 37.
It is detected whether or not the paper is being conveyed, and in step 104 it is determined whether or not the paper feed sensor 37 has detected the paper.

If there is a jam during paper feeding and the paper feed sensor 37 does not detect the transfer paper P1 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 PL, the drive of the paper feed roller 22 is stopped in step 105.

At this time, the leading edge of the transfer paper PL has reached the nip between the registration rollers 25 and 2B.
Then, the registration rollers 25,
Start driving 2B.

Next, in step 107, when the gripper 30 grips the leading edge of the transfer paper P, the transfer paper P is attracted to the circumference L of the transfer drum 29 by the charging action of the attraction charger 31, and the image is transferred as the transfer drum 29 rotates. After reaching the position (between the photosensitive drum 33 and the transfer charger 32), power is supplied to the transfer charger 32 in step 108, so that image transfer is started. At this time, the trailing edge of the transfer paper Pl has passed the registration rollers 25.2B, so the registration rollers 25, 2B are stopped at step 108.

Immediately after this, in step 110, feeding of the transfer paper P2 in the paper feed force sensor 21 used for the second image recording is started. Next, in step 111, the paper feed sensor 37
Based on this, it is determined whether the second sheet of transfer paper P2 has been fed as specified. If the transfer paper P2 is jammed and the paper feed sensor 37 is unable to detect the transfer paper P2 within a predetermined time, a process to be described later is executed in step IIIA.

On the other hand, if the transfer paper P2 is detected by the paper feed sensor 37 within the predetermined time, the process moves to step 112, 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 Pl on the preceding transfer drum 28, but the leading end of the transfer paper Pl is released from the gripper 30 after the transfer, and is removed from the transfer drum 29 by the stay and tab 113. Separation begins and the material is transferred onto the conveyor belt 34. Next, in step 114, the image transfer of the preceding transfer paper Pl is completed up to the rear end, and the image transfer is completed in the next step 115.
Then, the transfer paper P1 is completely separated from the transfer drum 28. 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 tte, the registration rollers 25 and 26 are moved at a predetermined timing according to the rotation angle of the transfer drum 28 so that the subsequent transfer paper P2 can reach the gripper 30.
Start driving. Furthermore, stay, Pu 11? transfer paper P
When grip 2 is completed, in the next step 118,
Image transfer is started in the same way as the previous transfer paper p1.

At this time, the preceding double sheet of transfer paper is transported by the transport belt 34 and enters the fixing section 43 .

Next, in step 118, the discharge sensor 3 is activated within a predetermined time.
By determining whether or not B has detected the preceding transfer paper P, it is determined whether or not the transfer paper Pi has jammed in the fixing section 43. If the paper ejection sensor 3B does not detect it, the next step described later is performed. Move to the flow shown in Figure 5.

On the other hand, when the preceding transfer paper PI is detected by the paper discharge sensor 3B, the process moves to the next step 120.

In step 120, 1 is added to the control variable n described above to count the number of image recordings.

Thereafter, the preceding transfer paper P1 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.
5.28, the registration rollers 25 and 2B are stopped in step 121. Next step 122
Then, it is determined whether or not the number of image recordings has reached a predetermined number N. If not, the process returns to step 110, transfer paper P for the next image recording is carried in, and each process described above is repeated.

On the other hand, in step 122, when the image recording reaches the predetermined number N, the process proceeds to the next step 123. At this time, the image is being transferred to the latter half of the N-th transfer paper pN on the transfer drum 28, but the leading edge of this transfer paper pN is released from the gripper 30 after the transfer, and in step 123, the image is transferred to the transfer drum 28. separation begins. Then step 1
After the image transfer is completed to the rear end of the transfer paper pN in step 24,
In the next step 125, the transfer paper pN is completely transferred to the transfer drum 2.
Separate from 8.

Thereafter, the transfer paper pN is transferred to the fixing section 4 by the conveyor belt 34.
3, and the image is fixed. Then step 12B
In step 127, if the paper ejection sensor 36 detects the transfer paper PM 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 the process returns to step 127. The process moves to step 129 to end the continuous recording of images.

On the other hand, if the ejection of the transfer paper pN is not confirmed in step 126, the process moves to step 150, the entire drive system is stopped, and then an error message is displayed in the next step 151. here,
When the operator removes the transfer paper pN in the fixing section 43 and resets the apparatus, the process moves from step 152 to step 153, and the photosensitive drum 33.
Transfer drum 28. Conveyor belt 34. Fixing roller 38, 3
9 starts each drive.

Thereafter, the process moves to the image recording flow for only one sheet of transfer paper p shown in FIG. In FIG. 4, each process from step 201 to step 207 is similar to steps 103 to 109 when recording images on multiple sheets of transfer paper P shown in FIG.
This is the same process as . Furthermore, each step 211 to 214 branched from step 202 also corresponds to step 14 in FIG.
The same processing as 0 to 142 and 102 is performed.

On the other hand, if the apparatus operates normally up to step 207, the transfer paper P is moved from the leading end where the transfer has been completed to step 207.
Separation starts from the transfer drum 2s at step 8, and the next step 2
If the transfer is completed at the rear end at 0θ, step 1 in Figure 3
Returning to step 25, the steps from step 128 onwards are executed to check whether the final paper is conveyed normally.

Further, if the paper discharge sensor 3B does not detect the transfer paper Pi-1 within the predetermined time in step 119, the control shifts to the flowchart shown in FIG.

First, in step 301, the driving of the fixing rollers 38 and 38 is stopped, and the fixing heaters 40 and 41 are stopped.
Cut off the power to the In step 302, a delay operation is performed to continue the image currently being transferred on the transfer drum 29-L. Next, in step 303, for example, the image transfer of the first color of the transfer images to be multi-transferred is completed.

Thereafter, in step 304, the entire drive system is stopped, and in the next step 305, a jam display is displayed to notify the operator that a jam has occurred. In step 30B, the fixing unit 43
Wait for jam removal and reset of device operation, and
When the jam processing and reset are completed, step 307
to stop the jam display, and in the next step 308, the photosensitive drum 33, transfer drum 29, fixing roller 38, and
9 and energization of the fixing heaters 40 and 41 are started to prepare for the next image transfer.

In step 309, the transfer paper Pi of the transfer drum 29J-
Image formation and transfer of the remaining several colors of the transfer image to be multi-transferred to the image forming apparatus are performed. Then, in step 308,
When images of all the planned colors are multiple-transferred onto the transfer paper Pi of the transfer drum 2θ, the driving of the conveyor belt 34 is started in the next step 310, and further, the transfer paper Pi is separated from the transfer drum 28 in step 311. Start.

Thereafter, in step 312, the temperature of the fixing unit 43 is detected by the temperature sensor 42, and it is determined whether the detected temperature is within a temperature range that allows fixing. If the fixing unit 43 has not reached the predetermined temperature range, the process moves to step 321;
If the temperature is within the set range, the process moves to step 313.

In the staple 2 313, the transfer paper P of the transfer drum 294-
i is separated to the rear end to complete the separation, and in the next step 314, the transfer paper Pi is conveyed to the fixing section 43 and the image is fixed. In step 315, it is determined based on the detection output of the paper discharge sensor 38 whether the transfer paper Pi has passed through the fixing section 43 without jamming. Here, if it is determined that the image fixing has been normally executed and the paper ejection sensor 3B has detected the transfer paper Pi, the total number of image formations is updated in step 318.

In step 317, the remaining number of image recordings is 2 times 1-.
In this case, the process returns to the previous stage of step 103 in FIG. 3 and the above-described image forming procedure is repeated. On the other hand, when the remaining number of image recordings is one, the process moves to the flow shown in FIG. 4, then moves from step 208 to the stage before step 125, and returns to the original flow.

- On the other hand, if it is determined in step 312 that the temperature of the fixing unit 43 is not within the set range, step 321
Then, a display is made to notify the operator that the temperature of the fixing unit 43 has not reached the predetermined value.

Next, in step 322, a delay operation is performed to completely separate the transfer paper Pi of the transfer drum 21111- to the rear end. Then, in step 323, after the separation is completely completed and the entire surface of the transfer paper Pi is transferred to the conveyor belt 34,
In step 324, the drive of the conveyor belt 34 is stopped.

Next, when it is determined in step 325 that the temperature of the fixing unit 43 is not within the predetermined setting range, the process returns to step 324, and the state in which the transfer paper Pi is placed on the conveyor belt 34-h is maintained. This is maintained until the fixing temperature of the fixing unit 43 falls within the set range in step 325, but when the fixing unit 43 continues to be heated and the temperature falls within the set range, the process moves to the next step 32B.

After the operation display is canceled in step 32B, the drive of the conveyor belt 34 is started in step 327, and the transfer paper Pi is conveyed to the fixing section 43, and in the next step 314, the transferred image is fixed on the transfer paper Pi. Then, in the next step 315, if the paper discharge sensor 3B detects the transfer paper Pi, in step 31B, 1 is added to n to update the number of image recordings.

On the other hand, if the paper discharge sensor 38 does not detect the transfer paper Pi in step 315, the process moves to the next step 331. Then, in steps 331 to 325, the same processing as steps 150 to 153 shown in FIG. 3 is performed, and the process moves to the next step 317. Therefore, the operation of adding 1 to n in step 31B is not performed.

In step 317, the remaining number of image recordings is set to 2;
When , the process returns to the previous stage of step 103 in FIG. 3 and repeats the number of image formations described above, and when the remaining number of image recordings is one, the process moves to the flow in FIG. 4 and then steps 209 to 3 in FIG. Step! 25 and return to the original flow.

According to the above control procedure, for example, the transfer drum 28
Above, while the transfer paper Pi is transferring the first color image, the transfer paper Pi
-1, when a conveyance abnormality occurs in the fixing section 43, the image recording apparatus stops energizing the entire drive system and the heater of the fixing section 43 after the first color image transfer is completed. If the operator resets the operation of the apparatus by processing the transfer paper Pi-1 during this stop, the apparatus transfers the remaining color images to the transfer paper Pi and then fixes them using the conveyor belt 34. The transfer paper is conveyed to the section 43. Furthermore, during this process, the device detects the device temperature of the fixing section 43, and if the temperature is appropriate, the transfer paper Pi is transported to the fixing section 43, but if the temperature is inappropriate, the transfer paper Pi is held by the conveyor belt 34 until the temperature reaches the appropriate temperature. After that, it is carried into the fixing section 43.

On the other hand, while transferring the image to the transfer paper Pi of the transfer drum 28-L, if the separate transfer paper Pi11 jams in the paper feed section upstream of the conveyance path with respect to the transfer drum 29, step 111 in FIG. Then move to step IIIA. The predetermined processing of this step ttta is basically the same as each processing in FIG. 5, so the explanation thereof will be omitted.

That is, the process of step 301 shown in FIG. 5 is different in that the process of stopping the fixing roller, stopping the power supply to the fixing heater, and stopping the paper feeding operation are performed at the same time, and the subsequent control procedure is as follows. It is similar to FIG.

In this embodiment, the transfer paper Pi is made to wait on the conveyor belt 34, but instead of this, the transfer paper may be made to wait on the transfer drum.

Furthermore, the present invention is not limited to the color electrophotographic image recording apparatus as explained in the embodiments, but also applies to an electrophotographic image recording apparatus that forms images on both the front and back sides of a sheet material using a front-back reversing mechanism of a sheet plate and a transfer drum. is also applicable.

〔Effect of the invention〕

As explained above, according to the present invention, when a conveyance abnormality occurs in a sheet material other than the one on the transfer drum, image transfer on the transfer drum is continued and completed without immediately stopping, and the conveyance abnormality is eliminated. After the sheet material has been processed, the sheet material on the transfer drum is guided to the fixing means and fixed when the fixing temperature of the fixing means reaches a predetermined value. It can be discharged in a timely and efficient manner without causing any problems.

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

■ If another sheet material jams during image transfer on transfer drum -1-, the image transfer will be completed even if the fixing heater is de-energized and the temperature of the fixing section drops when that sheet material is removed. Since the sheet material is heated by the fixing section to reach a temperature at which fixing can be performed, the sheet material is transported to the fixing section and fixed, so that problems such as poor fixing and low-temperature offset do not occur.

■ As in the case of multiple transfer, after removing the jammed sheet material, the fixing heater is first energized to control the temperature, and after completing the multiple transfer of the remaining images to be transferred, the temperature of the fixing section is detected. Since it is determined whether or not the sheet material should be carried into the fixing section, the heating time of the fixing section can be increased by the time required to perform the remaining image transfer.

That is, compared to an operation in which multiple transfer is performed after waiting for the temperature of the fixing section to rise, the time required to wait for heating is apparently shorter.

■ After removing the jammed sheet material, if the temperature of the fixing section is not sufficiently raised, remove the sheet material on which the image has been transferred just before the fixing section.
For example, since the sheet material is placed on standby by the conveyor belt L, the time from when the temperature of the fixing section reaches an appropriate temperature until the sheet material is fixed and discharged can be minimized. That is, for example, when the sheet material is placed on standby in the transfer drum L, the sheet material is separated from the transfer drum, conveyed, and fixed after the temperature of the fixing section reaches an appropriate temperature, so the time required for this separation and conveyance is required. However, in the embodiment described above, the waiting time due to this movement can be minimized.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a color electrophotographic image recording apparatus to which the present invention is applied; FIG. 2 is a block diagram showing an example of the control system of the apparatus shown in FIG. 1; FIG. 3 is a block diagram showing an example of the control system of the apparatus shown in FIG. Figure 4 is a flowchart showing the main flow of the image recording sequence during continuous image formation in a device that has been used for continuous image formation. 7 is a flowchart showing an interrupt sequence when a conveyance abnormality occurs in a fixing unit. P... Transfer paper, 25.28... Registration roller, 28... Transfer drum, 33... Photosensitive drum, 34... Conveyance belt, 36... Paper discharge sensor, 37... Feeding Paper sensor, 38.39... Fixing roller. 40... Temperature sensor, 41.42... Fixing heater, 43... Fixing unit, 501... CPU. 502...ROM, 503...RAM. Figure 1

Claims (1)

[Scope of Claims] 1) A rotatable carrier for supporting a sheet material and transferring a toner image onto the sheet material; a fixing means for fixing the toner image transferred to the sheet material; and a fixing means for fixing the toner image transferred to the sheet material. temperature detecting means for detecting fixing temperature; conveying means for conveying the sheet material toward the carrier and conveying the sheet material from the carrier to the fixing means; a first control means for continuing and then terminating the transfer operation of the toner image to the sheet material existing on the carrier body when there is a conveyance abnormality in the sheet material existing on the carrier body and the fixing member; and second control means for controlling the sheet material to wait in a predetermined area until the fixing temperature of the fixing means detected by the temperature detection means reaches a predetermined value when the operation of the means resumes. Image recording device. 2) An image recording apparatus according to claim 1, wherein a sheet material detection means for detecting abnormality in conveyance of the sheet material is provided on the conveyance means. 3) In the image recording apparatus according to claim 2, the first control means may control the sheet material detection means to control the conveyance of a separate sheet material when the image is being transferred to the sheet material on the carrier. When an abnormality is detected, the operation of the carrier is continued until the image transfer on the sheet material is completed and then stopped, and when the carrier is rotated again, the sheet material on the carrier is transferred to the transport means. An image recording device characterized by being guided upward. 4) In the image recording apparatus according to claim 1, when the carrier is restarted, multiple transfers are performed on the sheet, and then the temperature of the fixing means is detected by the temperature detecting means. An image recording device characterized in that: 5) In the image recording apparatus according to claim 1, when the carrier is restarted, the sheet material on the carrier is guided onto the conveying means, and then the temperature of the fixing means is adjusted by the temperature detecting means. An image recording device characterized in that temperature detection is started.