JPH02158544A - Picture forming device - Google Patents

Abstract

PURPOSE:To surely perform jam processing by constituting a device successively performing electrification of a jam circuit system even during jam processing work removing a jamming sheet material from inside the device so as to continue a jam detecting and displaying function. CONSTITUTION:For processing a jam, even when a device is opened, a jam detecting display is successively performed by LED 13a to 13e unless jam detected means 12a to 12e are in non-detection of a jam sheet material removed. While in case of the two or more sheets of jam sheet materials existing in a sheet path, a jam detection display of the jam sheet material or its position display is continued as far as the jam sheet material is forgotten to be removed even in one part. Accordingly, an operator can easily recognize and confirm the jam sheet material to still exist in the other part, even after jam processing, by the display not eliminated and the jam processing to be surely performed by the display eliminated.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is directed to forming a sheet on which an image has been formed by transporting a sheet material fed from a sheet material feeding means section to an image forming means section and forming an image thereon. The present invention relates to an image forming apparatus such as a printer, an e-copier, or a facsimile machine that outputs material to a discharge section.

In the above, the image forming means includes various conventionally known printing mechanisms such as a transfer type or direct type electrophotographic copying mechanism, an electrostatic recording (printing) mechanism, a magnetic recording mechanism, a fist thermal recording mechanism, an impact type or a non-impact type printing mechanism, etc. This is a one-way image-forming child actor/mechanism based on the image-forming principle.

Sheet materials include transfer paper, photosensitive paper, electrostatic recording paper, and magnetic recording paperφ
Printing paper, printing paper, etc.

The sheet material feeding means section is, for example, a sheet material cassette insertion/removal type sheet material separation/feeding mechanism, a sheet feeding deck mechanism 1 manual feeding mechanism, a roll paper cut feeding mechanism, or the like.

(Prior Art) Conventionally, this type of image forming apparatus has a sheet material conveyance path (sheet path) from a sheet material feeding section to a discharge section.
The device is equipped with a means for detecting the occurrence of a sheet material jam (paper jam), and when the means detects the occurrence of a jam, the detection signal causes an emergency stop of the apparatus, and a jam occurrence warning means is activated to shut down the apparatus. I'm trying to protect it. In other words, -H If the equipment continues to operate even after a jam has occurred, subsequent sheet materials may become jammed in the sheet bath one after another, causing the jam to expand, or the jammed sheet material may become tightly packed and pressurize the process equipment, etc. This prevents equipment from being damaged or destroyed.

Some jam occurrence warning means simply display and warn of the occurrence of a jam by lighting a lamp or sounding a buzzer, while others go even further and display the location where the jam has occurred within the entire length of the seat bus.
Some display the number of sheets that are jammed.

When the device operation stops urgently due to a jam, open the inside of the device, remove the jammed sheet material (jam processing), and press the reset button to reset the control circuit and close the device. The device is ready to be driven again.

(Problem to be Solved by the Invention) However, in the conventional image forming apparatus of this type, when the opening/closing door of the apparatus is opened to release the inside of the apparatus, or when the upper unit of the apparatus is opened and raised, the operation is linked to the opening and closing of the apparatus. With a safety switch? The configuration is such that the power to the circuit is cut off (power down).

When this power supply is cut off, the power supply to the jam circuit system is also cut off, and the display of the location where the jam has occurred and the number of jammed sheet materials disappear and become unknown.

Therefore, although the operator removed the jammed sheet material in the area where the jammed sheet material was, he did not notice or forgot to remove the jammed sheeted material in other areas and closed the equipment. You may find that jammed sheet material remains and perform jamming again.
There was uncertainty in jam handling.

If such unreliable jam handling is performed, when the device circuit is reset, the device is closed, and the device is restarted, the remaining jam sheet material may become so clogged that it is difficult to remove it. If the device is an electrophotographic device, for example, the photosensitive drum surface may be damaged by the wrinkled edges of the jam sheet material in the cleaning device.
There is also the possibility that other equipment may be compressed and damaged or destroyed, or that the jam sheet material may enter the corona discharger.

An object of the present invention is to eliminate the above-mentioned problems in jam handling in conventional devices.

(Steps for solving the problem) The present invention allows a sheet material fed from a sheet material feeding means section to be conveyed to an image forming means section, performs image formation, and discharges the sheet material on which the image has been formed. In an image forming apparatus that outputs to a paper sheet, the jam circuit system that detects the occurrence of a sheet material jam on the sheet material conveyance path from the sheet material feeding section to the ejecting section and displays a warning about the occurrence of a jam sheet is installed from within the device. Even during jam removal work to remove wood, electricity continues to be supplied to continue the jam detection function. This is an image forming apparatus characterized by the following.

(Function) With the above configuration, even if the device is released for jam removal, the jam detection display continues unless the jammed sheet material is removed and the jam detection child role does not detect the jammed sheet material. In addition, when there are multiple sheets of jammed sheet material in the sheet pass, as long as there is even one place where the jammed sheet material has been forgotten to be removed, the jam detection display or the position display of the jammed sheet material will continue to be displayed, and all of the jammed sheet materials in the sheet path will be displayed. The display will disappear when the jam sheet material is removed.

Therefore, the operator can easily recognize and confirm that the jammed sheet material is still present in other locations because the display does not disappear even after clearing the jam, and that the jam has been cleared properly because the display disappears. This makes it possible to ensure the reliability of jam disposal, and to prevent the above-mentioned problems caused by restarting the device with the jammed sheet material left behind.

(Example) The figure shows an example apparatus, and FIG. 1 is a schematic configuration diagram of the apparatus. The apparatus of this example is a printer or a copying machine using a transfer type electrophotographic method.

1 is an electrophotographic photosensitive drum that is driven to rotate at a predetermined circumferential speed in the clockwise direction of the arrow, and is uniformly charged by a charger 2 and subjected to light image exposure L (laser beam scanning exposure, slit exposure) by an image exposure means (not shown). A toner image corresponding to the target image information is formed on the circumferential surface of the drum by the toner image (exposure, etc.) and development by the developing device 3. Reference numeral 4 denotes a paper feed roller of the sheet material feeding means section. By rotationally driving the paper feed roller 4, the transfer sheet material P stored in a cassette 5 or the like is separated and fed one by one, and is exposed to light by a pair of registration rollers 6. The photosensitive drum 1 is conveyed to the transfer section between the photosensitive drum l and the transfer device 7 in synchronization with the progress of image formation on the drum l, and the photosensitive drum 1 is transferred to the surface of the sheet material.
The toner image formed on the front side is transferred.

The sheet material that has passed through the transfer section is separated from the surface of the photosensitive drum by a separating device 8, introduced into a fixing device IO by a conveying device 9, where the image is fixed, and then discharged from the device as an image-formed product.

After the transfer, the surface of the photosensitive drum is cleaned by a cleaning device 11 and then used for image formation.

Reference numerals 12a to 12e indicate sheet material feeding means or reflective sensors (LEDs as light sources) as jam detection means disposed at multiple locations along the sheet material conveyance path leading to the discharge section.
and a photosensor, etc.), and are arranged so that all jammed sheet materials can be detected in the event that a sheet jam occurs during the path. In this example, paper feed roller 4, registration roller pair 6, transfer device 17, separation device M811, fixing device 211
They are arranged at five locations in each vicinity of O.

Reference numeral 13 (Fig. 2) indicates a jam display panel 1, which is disposed, for example, in the console of the device, and is equipped with 5.
By lighting up the two display LEDs 13a to 13e, the location of the jammed sheet occurring along the route is displayed. That is, the five jam detection means 12a N12e correspond to the five display LEDs 13a to 13e, and when a jam is detected by the jam detection means 12a, the display LE0
13a lights up via the control circuit 21 (FIG. 3) to display that a jam has occurred at the paper feed roller 4 portion (paper feed position ■), and similarly jam detection means 12b to 12c*
Display LEDs 13 b - 13 corresponding to jam detection when jams are detected in 12 d - 12 e, respectively.
c* 13d to 13e light up individually, register roller pair 6 parts (paper feed 0 position 21), transfer device 7 part (drum front position), separation device 8 part (drum rear position 2t), fixing device 2110 A message indicating that a jam has occurred in the fixing position is displayed. Further, if a plurality of jam detection means 12a and 12d detect a jam, the corresponding display LEDs are turned on. For example, when the jam detection means 12a and 12d detect a jam, the display LEDs 13a and 13d are turned on. It is displayed that there are jammed sheet materials at two locations: the paper feed ■ position and the drum rear position.

If any one of the jam detection means 12a to 12e detects the occurrence of a jam, the operation of the apparatus is urgently stopped in response to the signal, and the display LED of the jam detection means that has detected the jam lights up. This allows the operator to recognize that the jam trouble has occurred and at which location (one location or multiple locations) on the seat bus.

FIG. 3 shows a block diagram of the energization system.

15 is a 100V commercial power supply, 16 is a device side plug inserted into the outlet of this power supply, 17 is a door switch of the device, 18 is a main power circuit of the device, 19 is a main control circuit, 2
0 is a sub power supply circuit connected by branching the electric path upstream of the door switch, and 21 is a jam detection/indication circuit connected to this sub power supply circuit.

The door switch 17 remains closed as long as the device door for opening the device is closed, and the main control circuit 1
9 is energized. When the door of the apparatus is opened to clear a jam or the like, the door switch 17 is opened and the main power supply circuit 18 is turned off, so that power to the main and control circuit 19 is cut off.

On the other hand, as long as the device side plug 16 is inserted into the power supply 15, the sub power supply circuit 20 is energized regardless of whether the door switch 17 is opened or closed, and power is supplied to the jam detection/display circuit 21 at a voltage of, for example, 5V. Ru.

Therefore, the occurrence of a jam is detected by the jam detection means 12 (a-e), and the detection signal is fed back to the main control circuit 19 to emergency stop the device operation, and the display LED 13 (a-e) of the display panel 13 is ) lights up to indicate the location of the jam, and even if the door switch 17 is opened by opening the device door to clear the jam and the power to the main power circuit 18 and main control circuit 19 is cut off. The jam detection/display circuit 21 continues to be energized, and the jam detection/display function continues.

The jam display disappears when the jammed sheet material is removed and the jam detection means that had been detecting the jammed sheet material no longer detects the jammed sheet material. If there is a part of the jammed sheet material that has been forgotten to be removed, the jam detection means for that part of the sheet material continues to detect the jam and the jam display LED corresponding to the means continues to light up unless the sheet material is removed.

Therefore, the operator can easily recognize and confirm that jammed sheet material is still present in other locations because the display does not disappear even after the jam has been cleared, and that the jam has been properly cleared because the display has cleared. This makes it possible to ensure the reliability of jam disposal, and to prevent the above-mentioned problems caused by restarting the device with the jammed sheet material left behind.

After the jam is cleared, the control circuit 19 is reset by the reset means 22, and the door switch 1 is closed by closing the device door.
7 is closed and the device is ready to be driven again.

The reflective sensor serving as the jam detection means 12(a-e) may be a transmissive sensor, or any other suitable sheet material sensor may be used.

The jam display displays the number of jammed sheets, and each time a jammed sheet is removed, the displayed number is decremented, and when all the jammed sheets are removed, the displayed number becomes zero, and all the jammed sheets are removed. It is also possible to adopt a configuration in which it is recognized that the sheet material has been reliably removed.

(Effects of the Invention) As described above, according to the present invention, the operator can reliably clear the jam, and as a result, the jam can be cleared easily at -degrees, and the jammed sheet material is left behind. This has the effect of preventing damage to the equipment due to

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of the apparatus, FIG. 2 is a plan view of the jam display panel portion, and FIG. 3 is a block diagram of the energization system. 12a to 12e are jam detection means (reflection type or transmission type sheet material sensor), and 13a to 13e are LEDs for indicating a jam location. Figure 3 Patent applicant: Canon Co., Ltd. Agent Yukio Takanashi [1st a (]

Claims (1)

[Claims] (1) In an image forming apparatus that transports a sheet material fed from a sheet material feeding section to an image forming section, performs image formation, and outputs the image-formed sheet material to a discharge section. The jam circuit system, which detects the occurrence of a sheet material jam on the sheet material conveyance path from the feeding section to the discharge section and displays a warning, continues to be energized even during the jam processing operation to remove the jammed sheet material from inside the device. An image forming apparatus characterized in that a jam detection/display function is continued.