JPH0614204B2 - Image forming device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an image forming apparatus for counting the number of jammed recording materials.

Prior art Conventionally, troubles in this type of device, especially jam processing such as detection of jam and displaying information related to jam, after the jam is detected, symbols, numbers, characters indicating the jam state are displayed, and the number of jams is further reduced. After the display, the drive system for the image forming operation such as the copying operation is stopped. That is, the jam display was performed before the driving was stopped.

However, in that case, when the inertia of the drive system is large, or when an external additional device, for example, a sorter is connected, the sorter device covers the discharge port after the drive is stopped after the jam is detected. Sometimes the jam paper is pulled out, and the jam processing message goes crazy,
There is a drawback in that the number of jams is displayed confusingly and trouble handling such as jam handling becomes complicated.

The present invention has been made in view of the above points, and an object of the present invention is to provide a conveyance control device that can appropriately perform a display when a conveyance trouble occurs and can smoothly perform the conveyance trouble processing. Is.

Embodiment FIG. 1-1 is a structural diagram of a copying machine which is an embodiment of the present invention. 1-2 is an external view of a sorter 700 connected to the copying machine, and 701 is a feeding roller. The sorter 700 corresponds to the storage device of the present invention.

In FIG. 1-1, 100 is a copying machine main body which is an image forming apparatus of the present invention. Reference numeral 33 denotes a photosensitive drum, which rotates clockwise as indicated by an arrow. Reference numeral 50 denotes a main motor which is a driving means of the present invention, and is the photosensitive drum 3
3, the fixing device 44, the transport unit 41, the paper feed roller 3
8 and the like, all of the original illumination lamps 21 are driven via a chain or the like (not shown).

Further, 31 is a high-voltage charger. As a result, electric charges are generated on the photosensitive drum 33. Then, after exposure at the point A to form an electrostatic latent image, toner is attached by the developing roller 34 in the developing device 29 to form a visible image.

Then, in the transfer charger 40, the toner image is transferred onto the transfer paper. When the front end of the toner image and the front end of the transfer paper coincide with each other, the toner is fed from the cassette 37 by the rotation of the paper feed roller 38. The transferred transfer paper is sent out by the registration roller 39. At this time, the exposure of the original document is illuminated by the original document illumination lamp 21, and the optical system including the original document illumination lamp 21 scans the original document in the direction of the arrow while moving the reflection mirrors 24, 25, 27 and 28 and the lens 26. After that, an image is formed at the point A on the photosensitive drum 33 and exposure is continued.

Reference numeral 48 is a registration sensor. Reference numeral 20 is a home position sensor. The registration sensor 48 starts the rotation of the registration roller 39 so that the leading edge of the image and the leading edge of the transfer sheet are aligned with each other. Reference numerals 22 and 23 are reflection sensors, and 22 is a cassette 37 which is an inverted position in an optical system of a small size (for example, B5, A4).
Reference numeral 3 is the reverse position of the large size optical system (for example, B4, A3).

After the transfer, the photosensitive drum 33 is cleaned by the cleaner brush 36 of the cleaner unit 35 and then electrostatically cleaned by the eraser 32 to prepare for the next charging.

On the other hand, the transfer sheet on which the toner image has been transferred is separated from the photosensitive drum 33, and is conveyed by the conveying section 41 toward the fixing device 44. At this time, conveyance is continued while being attracted downward by the suction fan 42.

The toner image on the transfer paper is fixed by the fixing roller 44, and is discharged onto the paper discharge toner 47 by the paper discharge roller 46 as a completed copy paper.

Reference numeral 45 is a web motor that winds a web for cleaning the fixing roller 44, 43 is a power transformer, and 30 is a heat exhaust fan for letting the heat of the document illumination lamp 21 escape.

Reference numeral 52 is a platen glass, and 51 is a pressure plate for pressing the original.

Further, B and C are paper sensors, B is a separation sensor, and C is a paper ejection sensor.

The paper feed roller 38, the registration roller 39, and the transport unit 4
1. The paper discharge roller 46 corresponds to the conveying means of the invention, and the photosensitive drum 33 and the fixing roller 44 correspond to the image forming means of the invention.

By the way, 49 is a potential sensor for measuring the surface potential of the photosensitive drum, and the surface potential of the photosensitive drum is generally as shown in FIG. 2, and can be charged up to V ₀ . Then, after passing through dark decay, exposure is performed at the exposure point A, the surface potential drops to V _L , and the contrast between the bright portion and the dark portion is increased. At this time, depending on the brightness of the original, V
_L is falling change and V _L is pale manuscript, and V _L dark in reverse
Goes up.

Next, the control of the copying machine of the embodiment will be described. The sequence program in the entire copying machine has a copy routine and a jam routine. FIG. 3 is a control flow chart of the copy routine. In step 301,
Paper is fed from the cassette 37 in response to a copy start signal from a copy start key (not shown). Then, since the transfer paper has entered the copying machine, 1 is added to the jam counter CNT.

In step 302, the optical system starts advancing and waits for registration timing. When the registration timing is reached, the transfer paper is transferred to the photosensitive drum 33 by the rotation of the registration roller 39.
However, the jam detection also starts at the same time (detailed below).

Next, in step 303, waiting for the optical system to reach the reverse position, the optical system changes from forward to reverse and returns to the home position.

This completes the copy routine.

FIG. 4 shows a control block diagram for executing the entire sequence (copy routine, jam routine) of the copying machine. 1 is a timer function (T ₁ , T ₂ , T ₃ , T ₄ , T ₅ ).
It is a CPU that has, and corresponds to the control means of the present invention.
2 is a driver. RS is a signal from the reflection sensors 22 and 23, KS is a signal from the home position sensor 20, and KS is an input signal from a key (not shown) or the like. BS
Is a signal from the separation unit sensor B, CS is a signal from the paper discharge unit sensor C which is the discharge detection means of the present invention, and RGS is a signal from the registration sensor 48. Further, M is the main motor 50, JAMND is the jam number display which is the second display means of the present invention, and JAMD is the jam display means which is the first display means of the present invention. The RAM stores and controls flags and the like, and the ROM stores a control program.
Further, CNT is a counter for the number of jams and the like, and corresponds to the counting means of the present invention.

FIG. 5 shows a control flow chart of the jam routine. The CPU 1, the separation unit sensor B, and the discharge unit sensor C that execute this flow chart correspond to the jam detecting unit of the present invention. Also, the timing chart for jam handling is
Shown in the figure. Further, FIG. 7 shows the timing of the jam processing when copying a large number of sheets. Further, FIG. 8 is a flow chart showing the entire sequence of the copying machine having the jam routine and the copy routine.

The jam routine will be described below with reference to FIGS. 5, 6, 7, and 8.

In FIG. 6, the jam routine starts from the registration timing. In the timing chart of FIG. 6, paper detection is performed three times. That is, the separation jam sensor B detects the separation jam (step 401), and the paper discharge sensor C detects the paper ejection delay jam (step 40).
It is the detection of discharged sheet jam of 2) (step 403).

The timers T _{1 to} T ₅ are based on the timer function of the CPU 1 and correspond to the timer means of the present invention.

If a jam is detected at the sheet discharge retention jam detection d, that is, if the signal from the sheet discharge section sensor C becomes as indicated by a dotted line in, a timer is prepared in step 404 of FIG. Start T _4, after a time _{T 4} has elapsed, to stop the main motor 50 at step 405. Here, after the lapse of T ₅ hours, the jam display and the value of the jam counter CNT are displayed.

In the case of multiple copy of FIG. 7, the next transfer sheet passes through the separation unit sensor B while the previous transfer sheet is being ejected.
When the transfer sheet does not reach the separation section sensor B at N = 4 of the sheet, a jam is detected at point e, and the fifth sheet is detected.
From step 401 in the figure, since there is no transfer sheet in the separating portion B, the process proceeds to step 404. Here, as described above, the main motor 50 is stopped after the lapse of T ₄ hours. Here, the jam counter CNT is 2.

That is, the transfer sheet N = 3 in FIG. 7 is ejected, the process proceeds to NO in step 802 in FIG. 8 and the count number is set to 1
If the transfer sheet of N = 4 is jammed by the separation section sensor B before being reduced, the counter C is counted in step 301 of FIG.
NT becomes 2. This value of counter CNT is
The jammed paper P1 jammed before the fourth sheet reaches the separation sensor B (in the signal when the separation sensor B is jammed, the dotted line in FIG. 7) and the jammed paper P1 and the paper P2 remaining on the discharge sensor C
It represents two sheets (not jammed paper).

However, like the conventional copying machine, if the number of jams is displayed here, even if the main motor 50 is stopped, the transfer paper is ejected due to the inertia or the pulling out by the sorter 700 and the jam inside the copying machine. Even though the number of sheets is one, the number of displays is two.

However, as described above, after the main motor 50 is stopped,
The jam display and the number of jammed sheets are displayed not after the lapse of T ₅ hours, but when the transfer paper of N = 3 is ejected due to the inertia or the pulling out by the sorter 700 during the time T ₅ , the transfer sheet of N = 3 is displayed. In step 802, since there is no transfer sheet in the paper discharge section, the process proceeds to NO, and in step 803, the jam counter is decremented by 1, so that the current accurate jam number “1” is indicated by the jam number indicator JAM.
Displayed on ND. Therefore, the user can accurately grasp the state of the jam, and can promptly take measures against the jam.

Effect As described above, according to the present invention, when the driving of the driving unit is stopped by the jam of the recording material, the count value of the counting unit according to the count value of the counting unit when a predetermined time elapses after the driving of the driving unit is stopped Since the display relating to the number of jams is performed by the jamming device, even if the storage means connected to the image forming apparatus pulls out the stopped recording material in the vicinity of the discharge portion of the image forming apparatus after the driving means is stopped, the jam is accurately detected. It is possible to provide an image forming apparatus that can display the number of sheets and that allows a user to quickly perform trouble handling.

[Brief description of drawings]

FIG. 1-1 is a structural diagram of a copying machine which is an embodiment to which the present invention is applied. FIG. 1-2 is an external view when a sorter is connected to the copying machine. FIG. 2 is a diagram showing the relationship between time and surface potential on the photosensitive drum 33. FIG. 3 is a control flow chart of the copy routine. FIG. 4 is a control block diagram of the overall sequence of the copying machine. FIG. 5 is a control flow chart of the jam routine. FIG. 6 is a timing chart of the jam processing. FIG. 7 is a timing chart of the jam processing when copying a large number of sheets. FIG. 8 is a flow chart showing the sequence of the entire copying machine. 1 is a CPU, B is a separation unit sensor, 700 is a sorter, C is a paper ejection unit sensor, 38 is a paper feed roller, JAMD is a jam display, 39 is a registration roller, JAMND is a jam number display, and 46 is a paper ejection roller. , CNT is a counter, T ₁ , T ₂ , T ₃ , T ₄ , T ₅ are timers, and 50 is a main motor.

Continuation of the front page (56) Reference JP-A-57-13450 (JP, A) JP-A-54-97028 (JP, A) JP-A-55-161748 (JP, A) JP-A-56-6257 (JP , A) Japanese Unexamined Patent Publication No. 56-135856 (JP, A) Actual Development No. 54-88785 (JP, U) Japanese Patent Publication No. 56-40340 (JP, B2)

Claims (1)

[Claims] 1. An image forming apparatus, to which an accommodating device for classifying and accommodating recording materials discharged from an image forming apparatus is connected, and a conveying means for conveying recording materials along a conveying path, and the conveying means conveys the recording materials. An image forming means for forming an image on a recording material, a driving means for driving the conveying means and the image forming means, and detection that the recording material conveyed by the conveying means is discharged to the outside of the image forming apparatus. Discharge detecting means, counting operation for feeding recording material into the image forming apparatus and counting according to the output of the discharge detecting means, and jam detection for detecting jam of recording material in the conveying path. Means, and when the jam is detected by the jam detecting means, the driving of the driving means is stopped, while the detection by the discharge detecting means and the counting by the counting means are performed. Control means for continuing the operation, a timer means for timing the time, a first display means for displaying a jam occurrence of the recording material according to the output of the jam detection means, and a driving means for driving the driving means by the control means. An image forming apparatus, comprising: second display means for displaying the number of jammed sheets according to the count value of the counting means when the timer means measures a predetermined time after stopping.