JP2000214716A - Image forming device - Google Patents

Image forming device

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Publication number
JP2000214716A
JP2000214716A JP11014221A JP1422199A JP2000214716A JP 2000214716 A JP2000214716 A JP 2000214716A JP 11014221 A JP11014221 A JP 11014221A JP 1422199 A JP1422199 A JP 1422199A JP 2000214716 A JP2000214716 A JP 2000214716A
Authority
JP
Japan
Prior art keywords
fixing
transfer
image
unit
pressing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP11014221A
Other languages
Japanese (ja)
Inventor
Masaaki Ishii
Yoshitaka Masuda
Hidetoshi Nagata
Shigeru Oki
Takashi Osawa
義隆 増田
繁 大木
敬士 大沢
英稔 永田
正昭 石井
Original Assignee
Canon Inc
キヤノン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc, キヤノン株式会社 filed Critical Canon Inc
Priority to JP11014221A priority Critical patent/JP2000214716A/en
Publication of JP2000214716A publication Critical patent/JP2000214716A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device capable of restraining the occurrence of the jamming of transfer material to the minimum by properly changing the respective set values of oil coating amount, the feeding speed of a cleaning web, the pressing pressure of the cleaning web, the pressing pressure of a separation pawl, fixing temperature by a fixing means and transfer material carrying speed and the like in the fixing means according to a previously prepared program by remote control by the time when a serviceman is sent to perform maintenance work. SOLUTION: The occurrence of the jamming of the transfer material S is restrained to the minimum by properly changing the respective set values of the oil coating amount, the feeding speed and the pressing pressure of the cleaning web 17, the pressing pressure of the separation pawl 23, the fixing temperature by a halogen heater 7 and the transfer material S carrying speed and the like in a fixing device 6 in the image forming device from a control center based on information detected by a jammed sheet number detecting means and a used sheet number detecting means consisting of photodetectors 27 and 28 or an image ratio calculation means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, a printer and a facsimile, and more particularly, to a transfer material formed by electrostatically transferring a toner image on an image carrier to a transfer material. The present invention relates to an image forming apparatus having a fixing unit for fixing an unfixed toner image by heating and pressing.

[0002]

2. Description of the Related Art In a fixing unit of an image forming apparatus using a conventional electrophotographic process, oil is applied to a fixing roller to facilitate separation of a transfer material. Further, in order to clean the fixing roller, the web is pressed against the fixing roller to clean the web, and at the same time, a new web is sent out.

The transfer material is conveyed while nipping the transfer material between the fixing roller and the pressure roller. The transfer speed can be increased as the temperature of the fixing roller increases. Further, a separation claw is provided for mechanically peeling and separating a transfer material that is incompletely separated while being in close contact with the fixing roller.

[0004] Each set value of the oil application amount, the web feed speed, the web pressing pressure, the rotation speed of the fixing roller, the pressing pressure of the separation claw, the fixing temperature by the fixing means, etc. in the fixing unit related to the maintenance is fixed in advance at the time of manufacture. Some are set or can be adjusted appropriately by a service person.

[0005]

However, in the above-mentioned prior art, the amount of oil applied in the fixing unit related to maintenance, the web feed speed, the web pressing pressure, the rotation speed of the fixing roller, the pressing pressure of the separation claw, and the fixing means are determined. Each set value such as the fixing temperature is set to a fixed value in advance during manufacturing or is adjusted appropriately by a serviceman at the time of maintenance. For example, jamming of the transfer material occurs when the fixing roller is used up to near the endurance number. When the rate increases, jams occur frequently and the image forming apparatus frequently goes down until a service person goes to replace the fixing roller, thereby causing inconvenience to the user.

[0006] The present invention is to solve the above-mentioned problems,
The purpose is to apply the oil applied to the fixing means, the feed speed of the cleaning web, the pressing pressure of the cleaning web, and the pressing of the separation claw according to a program prepared in advance by the remote control before the service person goes to the site for maintenance. It is an object of the present invention to provide an image forming apparatus capable of minimizing the occurrence of a jam of a transfer material by appropriately changing respective set values such as a pressure, a fixing temperature by a fixing unit, and a transfer speed of a transfer material.

[0007]

To achieve the above object, an image forming apparatus according to the present invention comprises a transfer material formed by electrostatically transferring a toner image on an image carrier to a transfer material. In an image forming apparatus having a fixing unit for heating and pressure fixing the unfixed toner image, a fixing rotator provided with a heat source, an oil applying unit for applying oil to the fixing rotator, and a transfer in the fixing unit A jam number detecting means for detecting the number of jams of the material; and, when the jam number of the transfer material detected by the jam number detecting means exceeds a predetermined number, the amount of oil applied to the fixing rotating body by the oil applying means. And a control unit for increasing the number.

According to the above arrangement, when the number of jams of the transfer material detected by the number-of-jams-of-transfer-material detection unit exceeds a predetermined number, the control unit increases the amount of oil applied to the fixing rotating body by the oil application unit. By doing so, the transfer material can be easily separated from the fixing rotating body, and the occurrence of jam of the transfer material can be reduced.

Further, another image forming apparatus according to the present invention is configured such that an unfixed toner image on a transfer material formed by electrostatically transferring a toner image on an image carrier onto a transfer material is heated. In an image forming apparatus having a fixing unit that performs pressure fixing, a fixing rotator having a heat source, an oil applying unit that applies oil to the fixing rotator, and an image ratio of a toner image formed on a transfer material are calculated. Image ratio calculating means, and a control unit for increasing the amount of oil applied to the fixing rotating body by the oil applying means when the image ratio calculated by the image ratio calculating means exceeds a predetermined value. Features.

According to the above construction, when the image ratio calculated by the image ratio calculation means exceeds a predetermined value, the control unit increases the amount of oil applied to the fixing rotator by the oil application means, so that the fixing rotator is increased. The transfer material can be easily separated from the transfer material, and the occurrence of jam of the transfer material can be reduced.

Another image forming apparatus according to the present invention is configured such that an unfixed toner image on a transfer material formed by electrostatically transferring a toner image on an image carrier to a transfer material is heated. In an image forming apparatus having a fixing unit that performs pressure fixing, a fixing rotator including a heat source, a cleaning web that contacts a surface of the fixing rotator to clean the surface of the fixing rotator, and the cleaning web includes A web transport unit that transports the sheet while contacting the surface of the fixing rotator; a jam number detecting unit that detects the number of jams of the transfer material in the fixing unit; and a jam number of the transfer material detected by the jam number detecting unit. A control unit for increasing the transport speed of the cleaning web by the web transport unit when the number of sheets exceeds the number.

According to the above construction, when the number of jams of the transfer material detected by the number-of-jams-of-transfer-material detection unit exceeds a predetermined number, the control unit increases the transport speed of the cleaning web by the web transport unit. Removal of the offset toner or the like adhering to the surface of the fixing rotator is promoted, so that the transfer material is easily separated from the fixing rotator, and the occurrence of jam of the transfer material can be reduced.

Another image forming apparatus according to the present invention is configured such that an unfixed toner image on a transfer material formed by electrostatically transferring a toner image on an image carrier to a transfer material is heated. In an image forming apparatus having a fixing unit that performs pressure fixing, a fixing rotator including a heat source, a cleaning web that contacts a surface of the fixing rotator to clean the surface of the fixing rotator, and the cleaning web includes A web transport unit that transports the toner image while contacting the surface of the fixing rotator, an image ratio calculation unit that calculates an image ratio of a toner image formed on the transfer material, and an image ratio calculated by the image ratio calculation unit. A control unit for increasing a transport speed of the cleaning web by the web transport unit when the value exceeds the value.

According to the above construction, when the image ratio calculated by the image ratio calculation means exceeds a predetermined value, the control section increases the cleaning web transfer speed by the web transfer means so that the cleaning web is fixed on the surface of the fixing rotating body. The removal of the attached offset toner and the like is promoted, so that the transfer material is easily separated from the fixing rotating body, and the occurrence of jam of the transfer material can be reduced.

Further, another image forming apparatus according to the present invention is configured such that an unfixed toner image on a transfer material formed by electrostatically transferring a toner image on an image carrier to a transfer material is heated. In an image forming apparatus having a fixing unit that performs pressure fixing, a fixing rotator including a heat source, a cleaning web that contacts a surface of the fixing rotator to clean the surface of the fixing rotator, and the cleaning web includes Web conveying means for conveying while contacting the surface of the fixing rotator, pressing means for pressing the cleaning web against the surface of the fixing rotator, jam number detecting means for detecting the number of jams of the transfer material in the fixing means, When the number of jams of the transfer material detected by the number-of-jams detection unit exceeds a predetermined number, the pressing pressure of the cleaning web against the surface of the fixing rotating body by the pressing unit is increased. And having a control unit for.

According to the above arrangement, when the number of jams of the transfer material detected by the number-of-jams-of-transfer-material detection unit exceeds a predetermined number, the control unit presses the cleaning web against the surface of the fixing rotating body by the pressing unit. By increasing the value, the removal of offset toner and the like adhering to the surface of the fixing rotator is promoted, the transfer material is easily separated from the fixing rotator, and the occurrence of jamming of the transfer material can be reduced.

Further, another image forming apparatus according to the present invention is configured such that an unfixed toner image on a transfer material formed by electrostatically transferring a toner image on an image carrier to a transfer material is heated. In an image forming apparatus having a fixing unit that performs pressure fixing, a fixing rotator including a heat source, a cleaning web that contacts a surface of the fixing rotator to clean the surface of the fixing rotator, and the cleaning web includes Web transport means for transporting the cleaning web in contact with the surface of the fixing rotary body, pressing means for pressing the cleaning web against the surface of the fixing rotary body, and image ratio calculation for calculating the image ratio of the toner image formed on the transfer material Means for increasing the pressing pressure of the cleaning web against the surface of the fixing rotator by the pressing means when the image ratio calculated by the image ratio calculating means exceeds a predetermined value. Characterized in that it has a.

According to the above arrangement, when the image ratio calculated by the image ratio calculating means exceeds a predetermined value, the control unit increases the pressure of the cleaning web against the surface of the fixing rotating body by the pressing means, thereby fixing the image. The removal of the offset toner or the like adhering to the surface of the rotating body is promoted, the transfer material is easily separated from the fixing rotating body, and the occurrence of jam of the transfer material can be reduced.

Further, another configuration of the image forming apparatus according to the present invention is such that an unfixed toner image on a transfer material formed by electrostatically transferring a toner image on an image carrier to a transfer material is heated. In an image forming apparatus having a fixing unit that performs pressure fixing, a jam number detecting unit that detects the number of jams of a transfer material in the fixing unit, and an image ratio calculating unit that calculates an image ratio of a toner image formed on the transfer material When the number of jams of the transfer material detected by the number-of-jams detection unit exceeds a predetermined number and the image ratio calculated by the image ratio calculation unit exceeds a predetermined value, the fixing temperature by the fixing unit is reduced. And a control unit for lowering the transfer speed of the transfer material.

According to the above arrangement, when the number of jams of the transfer material detected by the transfer material jam number detecting means exceeds a predetermined number and the image ratio calculated by the image ratio calculating means exceeds a predetermined value, The control unit lowers the fixing temperature by the fixing unit and lowers the transfer speed of the transfer material, so that the occurrence of jam of the transfer material can be reduced.

In another image forming apparatus according to the present invention, an unfixed toner image on a transfer material formed by electrostatically transferring a toner image on an image carrier to a transfer material is heated. In an image forming apparatus having a fixing unit for performing pressure fixing, a fixing rotator provided with a heat source, a separation claw for separating a transfer material from the fixing rotator, and use of detecting the number of used transfer materials of the fixing rotator Number-of-sheets detecting means, and a number-of-jams detecting means for detecting the number of jams of the transfer material in the fixing means,
When the number of jams of the transfer material detected by the number-of-jams detecting means exceeds a predetermined number and the number of used transfer materials of the fixing rotating body detected by the used-number detecting means exceeds a predetermined number, the separation is performed. A control unit for increasing a contact pressure of the pawl with respect to the fixing rotating body.

According to the above construction, the number of jams of the transfer material detected by the number-of-transfer-material-jam detecting means exceeds a predetermined number, and the number of used transfer material of the fixing rotating body detected by the used-number detecting means is smaller than the predetermined number. When the number of sheets exceeds a predetermined number, the control unit increases the contact pressure of the separation claw with respect to the fixing rotating body, thereby facilitating separation of the transfer material from the fixing rotating body and reducing the occurrence of jamming of the transfer material. .

Further, another configuration of the image forming apparatus according to the present invention comprises: information on the number of jams of the transfer material detected by the number-of-jams detecting means; image ratio information calculated by the image ratio calculating means; Any one or more of the used number information detected by the detecting means is picked up by a base machine of a control center through an Internet communication network or a dedicated communication line, and the oil application amount to the fixing rotating body by the oil applying means, the web A conveying speed of the cleaning web by a conveying unit, a pressing pressure of the cleaning web against the surface of the fixing rotator by the pressing unit, a contact pressure of the separation claw on the fixing rotator, a fixing temperature by the fixing unit, and the fixing. One or more predetermined speeds of the transfer speed of the transfer material passing through the means. Characterized by downloading a value in an image forming apparatus connected by the Internet communication network or a dedicated communication line.

According to the above arrangement, the amount of oil applied to the fixing means, the feeding speed of the cleaning web, the pressing pressure of the cleaning web, the separation claw, and the like are determined in accordance with a program prepared in advance by the remote control until the service technician goes to perform maintenance. The setting values of the pressing pressure, the fixing temperature by the fixing unit, and the transfer speed of the transfer material can be appropriately changed to minimize the occurrence of the jam of the transfer material.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of an image forming apparatus using an electrophotographic process will be specifically described as an example of the image forming apparatus according to the present invention. FIG. 1 is a schematic cross-sectional explanatory view showing a configuration of an image forming apparatus according to the present invention, FIG. 2 is a block diagram showing a configuration of a control system of the image forming apparatus according to the present invention, and FIG. FIG. 4 is a block diagram showing a configuration of an information transmitting unit of the image forming apparatus according to the present invention.

1 and 2, reference numeral 1 denotes an electrophotographic photosensitive drum which is an image forming means and serves as an image carrier.
A laser scanner (not shown) irradiates a uniformly charged surface of the photosensitive drum 1 with laser light corresponding to image information to form an electrostatic latent image, and toner is supplied by a developing device to form a toner image. You.

A transfer separation charger 2 is disposed at a position facing the photosensitive drum 1, and a transfer material S made of paper, synthetic resin, or the like fed by sheet feeding means (not shown) is transferred to a registration roller. The toner image formed on the surface of the photoconductive drum 1 is transferred and charged between the photoconductive drum 1 and the transfer / separation charger 2 in synchronization with the rotation of the photoconductor drum 1. The image is electrostatically transferred to the transfer material S by the action of the container 2.

That is, the surface of the photosensitive drum 1 is uniformly charged by charging means (not shown), and an image is written on the surface of the photosensitive drum 1 by a laser beam emitted from a laser scanner (not shown) to form an electrostatic latent image. Is formed, a toner is supplied to the electrostatic latent image by a developing device (not shown), the toner image is developed, and the toner image on the surface of the photosensitive drum 1 is transferred to the transfer material S by the transfer / separation charger 2. The operation of cleaning the surface of the photosensitive drum 1 by a cleaning unit (not shown) is repeated.

The transfer material S separated from the photosensitive drum 1 is transported by a transport belt 4 and further guided by a fixing entrance guide 5 to heat and pressurize the unfixed toner image formed on the transfer material S. And is conveyed to a fixing device 6 serving as a fixing unit for permanent fixing.

The fixing device 6 includes a fixing roller 8 serving as a fixing rotator having a halogen heater 7 serving as a heat source therein, and a pressing roller 9 serving as a pressing rotator disposed opposite to the fixing roller 8. Equipped.

An oil application roller 11 serving as an oil application means for applying a release oil 10 such as silicone oil is in contact with the surface of the fixing roller 8.
After the release oil 10 is pumped up by the pumping roller 13, the oil is applied to the squeezing roller 14 in contact with the pumping roller 13, and the oil application roller 11 in contact with the squeezing roller 14 is fixed by the fixing roller. 8 is coated with a release oil 10.

An aperture plate 15 is in contact with the aperture roller 14, and the aperture plate 15 is pressed by the aperture plate pressing means 16.
The contact pressure with respect to is adjusted. When the contact pressure of the diaphragm plate 15 against the diaphragm roller 14 is increased by the diaphragm plate pressing means 16, the amount of the release oil 10 on the diaphragm roller 14 is reduced by the diaphragm plate 15, and the release oil is sent to the oil application roller 11. The amount of mold oil 10 decreases and the diaphragm plate 15
When the contact pressure on the squeezing roller 14 is reduced, the amount of the release oil 10 sent from the squeezing roller 14 to the oil application roller 11 increases.

That is, an amount of oil inversely proportional to the contact pressure of the diaphragm plate 15 against the diaphragm roller 14 controlled by the diaphragm plate pressing means 16 is sent to the application roller 11, and the release oil 10 is applied to the surface of the fixing roller 8. Is adjusted.

Further, the outer peripheral portion of the fixing roller 8 is brought into contact with the surface of the fixing roller 8 at a position upstream of the oil application roller 11 in the rotation direction (clockwise direction in FIG. 1) of the fixing roller 8 so as to be fixed. A cleaning web 17 for cleaning the surface of the roller 8 is wound and arranged by a supply roll 18 and a winding roll 19 serving as web transport means.
The cleaning web 17 is rotated in the clockwise direction in FIG. 1 to rotate the cleaning web 17 in the direction of the arrow a in FIG. 1 which is opposite to the rotation direction (clockwise direction in FIG. 1) of the fixing roller 8. The cleaning web 17 before use wound around the supply roll 18 is sequentially sent out while being in contact with the surface, and the fixing roller 8 is
Take-up roll of used cleaning web 17 that has cleaned the surface of
Wind up with 19.

A pressing roller 21 made of an elastic material serving as pressing means for pressing the cleaning web 17 against the surface of the fixing roller 8.
The cleaning roller 17 is in contact with the fixing roller 8 with the cleaning web 17 interposed between the fixing roller 8 and the pressing roller pressing means 22 adjusts the pressing pressure of the cleaning web 17 against the surface of the fixing roller 8 by the pressing roller 21. It is supposed to.

Further, on the outer peripheral portion of the fixing roller 8, the rotational direction of the fixing roller 8 (see FIG.
A clockwise direction) and a separation claw 23 that separates the transfer material S from the surface of the fixing roller 8 and that is disposed on the downstream side so as to face the surface of the fixing roller 8. twenty three
The tip 23b of the separation claw 23 is lightly pressed against the surface of the fixing roller 8 by a spring (not shown).

The contact pressure of the separation claw 23 against the surface of the fixing roller 8 is adjusted by separation claw pressing means 24 shown in FIG.

On the upstream side and the downstream side in the transport direction of the transfer material S of the fixing device 6, a jam number detecting means for detecting the number of jams of the transfer material S in the fixing device 6 and the number of used transfer materials S of the fixing roller 8. Light sources 25 and 26 serving as sheet detection means also serving as sheet number detection means for detecting, and light receiving elements 27 and 28 facing the light sources 25 and 26, respectively, are provided.

The unfixed toner image formed on the transfer material S by the fixing device 6 is heated and pressurized to be permanently fixed, and the transfer material S discharged from the fixing device 6 is transferred to an upper guide plate.
It is guided by the lower guide plate 29 and the lower guide plate 30 and is discharged out of the machine.

The sheet detecting means constituted by the light source 25 and the light receiving element 27 is a sensor for detecting the transfer material S passing through the fixing entrance guide 5, and the sheet detecting means constituted by the light source 26 and the light receiving element 28 The sensor is disposed opposite to the position of the conveyance path between the separation claw 23 and the lower guide plate 30 and detects the transfer material S discharged from the fixing device 6.

As shown in FIG. 2, the control unit 31 includes a CPU (central processing unit) 31a, a ROM (read only memory).
31b, RAM (read / write memory) 31c, counter 31
The CPU 31a reads programs and various data from an external device such as a ROM 31b and an input device described later, performs necessary calculations and determinations, and performs various controls.

The CPU 31a of the control unit 31 has a transfer material S
Image ratio calculating means is provided for calculating the image ratio of the toner image formed above (the ratio of the total area of the toner image to the surface area of the transfer material S), and counts the number of pixels of the written image stored in the RAM 31c as a counter. The ratio of the number of pixels of the written image to the total number of pixels that can be written on the transfer material S counted by 31d is calculated.

The CPU 31a of the control unit 31 detects information on the number of jams of the transfer material S, information on the number of used sheets, etc. by the light receiving elements 27 and 28 which also serve as the number of jams detecting means and the number of used sheets detecting means, or the image ratio calculating means. In accordance with the obtained image ratio information, the current supplied to the halogen heater 7 built in the fixing roller 8 of the fixing device 6 is controlled, and the amount of heat applied to the transfer material S in the fixing device 6 is controlled to adjust the fixing temperature. .

Further, the CPU 31a rotates the fixing roller 8 in accordance with detection information such as information on the number of jams of the transfer material S by the light receiving elements 27 and 28, information on the number of sheets used, or image ratio information calculated by the image ratio calculating means. Drive motor 32
The conveyance speed of the transfer material S conveyed while being nipped by the fixing roller 8 and the pressure roller 9 is controlled by controlling the rotation speed of the transfer material S.

The CPU 31a stops the aperture plate 15 in accordance with detection information such as information on the number of jams of the transfer material S by the light receiving elements 27 and 28, information on the number of sheets used, or image ratio information calculated by the image ratio calculating means. The amount of oil applied to the fixing roller 8 by the oil applying means is controlled by controlling the aperture plate pressing means 16 which is in pressure contact with the roller 14.

The CPU 31a controls the take-up roll 19 in accordance with detection information such as information on the number of jams of the transfer material S by the light receiving elements 27 and 28, information on the number of sheets used, or image ratio information calculated by the image ratio calculating means. Rotary drive motor 20
The transport speed of the cleaning web 17 is controlled by controlling the rotation speed of the cleaning web 17.

Further, the CPU 31a cleans the pressing roller 21 according to detection information such as information on the number of jams of the transfer material S by the light receiving elements 27 and 28, information on the number of sheets used, or the image ratio information calculated by the image ratio calculating means. The pressing roller pressing means 22 for pressing the fixing roller 8 through the web 17 is controlled to adjust the pressing pressure of the cleaning web 17 against the surface of the fixing roller 8.

Further, the CPU 31a fixes the separation claw 23 in accordance with detection information such as information on the number of jams of the transfer material S by the light receiving elements 27 and 28, information on the number of sheets used, or image ratio information calculated by the image ratio calculating means. By controlling the separation claw pressing means 24 that presses against the roller 8, the contact pressure of the separation claw 23 against the fixing roller 8 is adjusted.

A counter 31d provided in the control unit 31
The transfer material S is detected from the time when the transfer material S is detected by the light receiving element 27 disposed on the upstream side of the fixing device 6 in the transfer material transport direction.
Is counted by the light receiving element 28 disposed downstream of the fixing device 6 in the transfer material transport direction, and based on this time, the CPU 31a determines whether or not a jam has occurred in the transfer material S in the fixing device 6. Is detected.

The ROM 31b stores various programs for operating the CPU 31a and various data necessary for recording character codes and dot patterns.
To the fixing roller 8, the rotation speed of the motor 32 for rotating the fixing roller 8, the pressing force of the diaphragm plate pressing means 16 for pressing the diaphragm plate 15 against the fixing roller 8, and the motor 20 for rotating the winding roll 19.
Rotation speed, the pressing force of the pressing roller pressing means 22 for pressing the pressing roller 21 against the fixing roller 8, and the separation claw 23
Each set value such as the pressing force of the separation claw pressing means 24 pressing against
A normal time when the transfer material S is detected by the light receiving element 28 from the time when the light receiving element 27 detects the transfer material S, the total number of pixels that can be written on the transfer material S of each size, and the like are stored.

The RAM 31c includes a working area for temporarily storing data and an operation result instructed by the CPU 31a, a buffer area for storing various data input from an external device, a text area for storing documents, and the like. The number of pixels of the written image counted by the counter 31d provided in the control unit 31, the time required for the transfer material S to pass through the fixing device 6, and the like are stored as needed.

Next, how the image forming apparatus according to the present invention is remotely controlled by a base machine of a control center via the Internet communication network or a dedicated communication line will be described with reference to FIGS.

Initially, the image forming apparatus operates with the standard set values. However, when a jam of the transfer material S occurs in the fixing device 6, the detection information of the light receiving elements 27 and 28 is transmitted to the control unit 31 shown in FIG. Counter 31d through the control board 33 of
The number of jams of the transfer material S is counted by the assist (ASSIST), which is stored in the RAM 31c at any time, and is transmitted to the base machine of the control center 35 by using the Internet communication network or the dedicated communication line via the communication modem 34. The communication is carried out, and the jam number information of the transfer material S is picked up as needed.

When the number of jams of the transfer material S exceeds the preset number, the control plate 35 prepares the diaphragm plate 15 according to a program prepared in advance.
Of the fixing roller 8 by reducing the pressing force of the
Increase the amount of oil applied to the roll or take-up roll
The rotation speed of the motor 20 for driving the rotation of the motor 19 is increased to increase the transport speed of the cleaning web 17, or the pressing roller pressing means 22 is controlled to increase the pressing pressure of the pressing roller 21 against the fixing roller 8 for cleaning. A command to increase the pressing pressure of the web 17 against the surface of the fixing roller 8 or to appropriately control the transmission is transmitted from the communication modem 34 of each of the image forming apparatuses A, B, and C to the RAM 31c and the control board 33 in this order. Then, each set value described above is changed.

After each of the set values is changed, the number of jams of the transfer material S in the fixing device 6 is counted and transmitted to the control center 35 again to obtain the effect of the change of the set value (the effect of changing the number of jams of the transfer material S). Is determined.

For example, in FIG. 3, the image forming apparatuses A,
In the case where the effect was obtained in B, but the occurrence of the jam of the transfer material S did not decrease in the image forming apparatus C, the control center 35 downloads the program prepared as the next stage to the image forming apparatus C and performs the above setting. Further changes in the value are made.

In this way, the set value is appropriately changed until the effect of the change of the set value (reduction of the number of jams of the transfer material S) appears, and the data is stored in the control center.
Stored in 35. Further, in the image forming apparatuses A and B in which the first set value change was effective, the number of sheets of the transfer material S used was advanced, and the effect of the change of the set value was reduced (the number of jams of the transfer material S was increased). In this case, the set value is changed to a value that is effective in the image forming apparatus C.

Here, if the effect does not appear, the setting value is further changed appropriately to search for the setting value at which the effect appears.

Next, a description will be given of an operation for preventing the image forming apparatus from being shut down until a service person is dispatched to take measures.

For example, the number of used fixing rollers 8 exceeds a predetermined value based on detection information of light receiving elements 27 and 28 serving as a used sheet number detecting means for detecting the number of used transfer materials S of fixing roller 8. If the service life is short, and the effect of the jam reducing program is not remarkable, the separation claw pressing means 24 is controlled to increase the contact pressure of the separation claw 23 with the fixing roller 8. Thus, the transfer material S is easily separated from the fixing roller 8.

However, as a disadvantage, there is a possibility that the fixing roller 8 may become unusable due to a claw mark left by the separation claw 23 on the surface of the fixing roller 8. However, in this case, since the fixing roller 8 has been used up to near the end of its service life, jamming of the transfer material S is prevented from occurring frequently until the serviceman is dispatched.
The image forming apparatus is not shut down until a service person is dispatched to take measures.

The image ratio of the toner image formed on the transfer material S is calculated instead of changing each set value when the number of jams of the transfer material S detected by the jam number detecting means exceeds a predetermined number. When the image ratio calculated by the image ratio calculating means exceeds a predetermined value, the pressing force of the diaphragm plate 15 against the squeezing roller 14 is reduced according to a program prepared in advance in the control center 35, and the oil applied to the fixing roller 8 is reduced. Either increase the application amount, or increase the rotation speed of the motor 20 that rotates the take-up roll 19 to increase the transport speed of the cleaning web 17, or control the pressing roller pressing means 22 to control the pressing roller 21. Increasing the pressing pressure on the fixing roller 8 to increase the pressing pressure of the cleaning web 17 against the surface of the fixing roller 8; Or by controlling appropriately combined.

In the same manner as described above, when the number of used fixing rollers 8 exceeds a predetermined value and the life of the fixing roller 8 is approaching, the image ratio calculated by the above-described image ratio calculating means is used. If the effect of the jam mitigation program based on is not remarkable, the separation claw pressing means 24 is controlled to increase the contact pressure of the separation claw 23 against the fixing roller 8 so that the transfer material S is easily separated from the fixing roller 8. Alternatively, the occurrence of jamming of the transfer material S may be prevented until the serviceman is dispatched, and the image forming apparatus may not be shut down until the serviceman dispatches and takes measures.

When the number of jams of the transfer material detected by the number-of-jams detecting unit exceeds a predetermined number and the image ratio calculated by the image-ratio calculating unit exceeds a predetermined value, a current supplied to the halogen heater 7 is supplied. The transfer speed of the transfer material S may be reduced by reducing the value to lower the fixing temperature applied to the transfer material S by the fixing device 6 and reducing the rotation speed of the motor 32 that rotates the fixing roller 8.

[0065]

Since the present invention has the above-described configuration and operation, the amount of oil applied to the fixing means in accordance with a program prepared in advance by a remote control before a service technician visits and performs maintenance is determined.
Minimize the occurrence of jams in the transfer material by appropriately changing the setting values such as the feed speed of the cleaning web, the pressing pressure of the cleaning web, the pressing pressure of the separation claw, the fixing temperature of the fixing unit, and the transfer speed of the transfer material. An image forming apparatus capable of performing the above-described operations can be provided.

Therefore, the above-mentioned respective set values are automatically searched for and set according to the user's individual use conditions such as the type of transfer material and the image ratio.
It is possible to greatly reduce the occurrence of jam of the transfer material.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional explanatory view showing a configuration of an image forming apparatus according to the present invention.

FIG. 2 is a block diagram illustrating a configuration of a control system of the image forming apparatus according to the present invention.

FIG. 3 is a schematic diagram illustrating communication between each image forming apparatus and a control center.

FIG. 4 is a block diagram illustrating a configuration of an information transmission unit of the image forming apparatus according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Photoreceptor drum, 2 ... Transfer separation charging device, 3 ... Registration roller pair, 4 ... Conveying belt, 5 ... Fixing entrance guide, 6 ...
Fixing device, 7 ... Halogen heater, 8 ... Fixing roller, 9 ...
Pressure roller, 10: release oil, 11: oil application roller, 12: oil pan, 13: pumping roller, 14: squeezing roller, 15: squeezing plate, 16: squeezing plate pressing means, 17: cleaning web, 18 ... supply roll, 19 ... take-up roll, 20 ... motor, 21
... pressing roller, 22 ... pressing roller pressing means, 23 ... separation claw,
23a: rotating shaft, 24: separating claw pressing means, 25, 26: light source, 2
7, 28: light receiving element, 29, 30: vertical guide plate, 31: control unit, 31a: CPU, 31b: ROM, 31c: RAM, 31d
... Counter, 32 ... Motor, 33 ... Control board, 34
... Communication modem, 35 ... Control center, A, B, C
... Image forming apparatus, S ... Transfer material

Continued on the front page (72) Inventor Shigeru Oki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hidetoshi Nagata 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Yoshitaka Masuda 3-30-2 Shimomaruko, Ota-ku, Tokyo F-term in Canon Inc. (reference) 2H033 AA36 BA21 BA46 BA51 BA57 CA18 CA22 CA30 CA36 CA48

Claims (9)

    [Claims]
  1. An image forming apparatus having a fixing unit for heating and pressing and fixing an unfixed toner image on a transfer material formed by electrostatically transferring a toner image on an image carrier to a transfer material, A fixing rotator provided with a heat source; an oil application unit for applying oil to the fixing rotator; a jam number detecting unit for detecting the number of jams of the transfer material in the fixing unit; and a jam number detecting unit. An image forming apparatus, comprising: a controller configured to increase an amount of oil applied to the fixing rotating body by the oil applying unit when the number of jams of the transfer material exceeds a predetermined number.
  2. 2. An image forming apparatus comprising a fixing unit for heating and pressing and fixing an unfixed toner image on a transfer material formed by electrostatically transferring a toner image on an image carrier to a transfer material. A fixing rotator provided with a heat source, oil applying means for applying oil to the fixing rotator, an image ratio calculating means for calculating an image ratio of a toner image formed on the transfer material, and the image ratio calculating means An image forming apparatus comprising: a control unit configured to increase an amount of oil applied to the fixing rotating body by the oil applying unit when the calculated image ratio exceeds a predetermined value.
  3. 3. An image forming apparatus having a fixing unit for heating and pressing and fixing an unfixed toner image on a transfer material formed by electrostatically transferring a toner image on an image carrier to a transfer material. A fixing rotator provided with a heat source; a cleaning web that contacts the surface of the fixing rotator to clean the surface of the fixing rotator; and a web transport that conveys the cleaning web while contacting the cleaning web with the surface of the fixing rotator. Means for detecting the number of jams of the transfer material in the fixing means; and the cleaning by the web transport means when the number of jams of the transfer material detected by the number of jam detection means exceeds a predetermined number. An image forming apparatus, comprising: a control unit configured to increase a web conveyance speed.
  4. 4. An image forming apparatus comprising a fixing unit for heating and pressing and fixing an unfixed toner image on a transfer material formed by electrostatically transferring a toner image on an image carrier to a transfer material. A fixing rotator provided with a heat source; a cleaning web that contacts the surface of the fixing rotator to clean the surface of the fixing rotator; and a web transport that conveys the cleaning web while contacting the cleaning web with the surface of the fixing rotator. Means for calculating an image ratio of the toner image formed on the transfer material; and when the image ratio calculated by the image ratio calculation means exceeds a predetermined value, the cleaning by the web transport means. An image forming apparatus, comprising: a control unit configured to increase a web conveyance speed.
  5. 5. An image forming apparatus comprising a fixing unit for heating and pressing and fixing an unfixed toner image on a transfer material formed by electrostatically transferring a toner image on an image carrier to a transfer material. A fixing rotator provided with a heat source; a cleaning web that contacts the surface of the fixing rotator to clean the surface of the fixing rotator; and a web transport that conveys the cleaning web while contacting the cleaning web with the surface of the fixing rotator. Means, pressing means for pressing the cleaning web against the surface of the fixing rotator, jam number detecting means for detecting the number of jams of the transfer material in the fixing means, and jam of the transfer material detected by the jam number detecting means A control unit for increasing a pressing pressure of the cleaning web against the surface of the fixing rotator by the pressing unit when the number of sheets exceeds a predetermined number. That the image forming apparatus.
  6. 6. An image forming apparatus comprising a fixing unit for heating and pressing and fixing an unfixed toner image on a transfer material formed by electrostatically transferring a toner image on an image carrier to a transfer material. A fixing rotator provided with a heat source; a cleaning web that contacts the surface of the fixing rotator to clean the surface of the fixing rotator; and a web transport that conveys the cleaning web while contacting the cleaning web with the surface of the fixing rotator. Means, pressing means for pressing the cleaning web against the surface of the fixing rotator, image ratio calculating means for calculating an image ratio of a toner image formed on a transfer material, and an image calculated by the image ratio calculating means An image forming apparatus comprising: a controller configured to increase a pressing pressure of the cleaning web against the surface of the fixing rotator by the pressing unit when the ratio exceeds a predetermined value. .
  7. 7. An image forming apparatus having a fixing unit for heating and pressing and fixing an unfixed toner image on a transfer material formed by electrostatically transferring a toner image on an image carrier to a transfer material, A jam number detecting means for detecting the number of jams of the transfer material in the fixing means; an image ratio calculating means for calculating an image ratio of a toner image formed on the transfer material; and a transfer material detected by the jam number detecting means. When the number of jams exceeds a predetermined number and the image ratio calculated by the image ratio calculation unit exceeds a predetermined value, a control unit that lowers the fixing temperature by the fixing unit and lowers the transfer speed of the transfer material, An image forming apparatus comprising:
  8. 8. An image forming apparatus having a fixing unit for heating and pressing and fixing an unfixed toner image on a transfer material formed by electrostatically transferring a toner image on an image carrier to a transfer material, A fixing rotator provided with a heat source; a separating claw for separating a transfer material from the fixing rotator; a used number detecting unit for detecting the number of used transfer materials of the fixing rotator; and a jam of the transfer material in the fixing unit. Jam number detecting means for detecting the number of sheets, the number of jams of the transfer material detected by the jam number detecting means exceeds a predetermined number, and the number of used transfer materials of the fixing rotating body detected by the used number detecting means An image forming apparatus comprising: a controller configured to increase a contact pressure of the separation claw on the fixing rotating body when the number of sheets exceeds a predetermined number.
  9. 9. One of the information on the number of jams of the transfer material detected by the number-of-jams detecting unit, the image ratio information calculated by the image-ratio calculating unit, and the used number information detected by the used-number detecting unit. One or a plurality of them are picked up by a base machine of a control center by an internet communication network or a dedicated communication line, the amount of oil applied to the fixing rotating body by the oil applying means, the speed of conveying the cleaning web by the web conveying means, the pressing means The pressing pressure of the cleaning web against the surface of the fixing rotator, the contact pressure of the separation claw on the fixing rotator, the fixing temperature of the fixing unit, or the conveying speed of the transfer material passing through the fixing unit. One or more predetermined settings to the Internet communication network or dedicated communication 9. The image forming apparatus according to claim 1, wherein the program is downloaded to an image forming apparatus connected by a line.
    The image forming apparatus according to claim 1.
JP11014221A 1999-01-22 1999-01-22 Image forming device Pending JP2000214716A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11014221A JP2000214716A (en) 1999-01-22 1999-01-22 Image forming device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11014221A JP2000214716A (en) 1999-01-22 1999-01-22 Image forming device

Publications (1)

Publication Number Publication Date
JP2000214716A true JP2000214716A (en) 2000-08-04

Family

ID=11855030

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11014221A Pending JP2000214716A (en) 1999-01-22 1999-01-22 Image forming device

Country Status (1)

Country Link
JP (1) JP2000214716A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008164657A (en) * 2006-12-27 2008-07-17 Kyocera Mita Corp Incorrect detection prevention apparatus and image forming apparatus
US8073373B2 (en) 2007-09-07 2011-12-06 Sharp Kabushiki Kaisha Image forming apparatus with device for reducing stagnant toner between fixing roller and cleaning web
US8406667B2 (en) 2009-09-28 2013-03-26 Ricoh Company, Limited Fixing device, image forming apparatus, and fixing method using an oiling unit and removing member
JP2016180926A (en) * 2015-03-25 2016-10-13 コニカミノルタ株式会社 Fixing device and image forming apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008164657A (en) * 2006-12-27 2008-07-17 Kyocera Mita Corp Incorrect detection prevention apparatus and image forming apparatus
US8073373B2 (en) 2007-09-07 2011-12-06 Sharp Kabushiki Kaisha Image forming apparatus with device for reducing stagnant toner between fixing roller and cleaning web
US8406667B2 (en) 2009-09-28 2013-03-26 Ricoh Company, Limited Fixing device, image forming apparatus, and fixing method using an oiling unit and removing member
JP2016180926A (en) * 2015-03-25 2016-10-13 コニカミノルタ株式会社 Fixing device and image forming apparatus

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