WO2001085461A1 - Mecanisme d'ouverture/fermeture de couvercles et dispositif d'impression - Google Patents

Mecanisme d'ouverture/fermeture de couvercles et dispositif d'impression Download PDF

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Publication number
WO2001085461A1
WO2001085461A1 PCT/JP2000/003014 JP0003014W WO0185461A1 WO 2001085461 A1 WO2001085461 A1 WO 2001085461A1 JP 0003014 W JP0003014 W JP 0003014W WO 0185461 A1 WO0185461 A1 WO 0185461A1
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WO
WIPO (PCT)
Prior art keywords
cover
paper
gear
cassette
image forming
Prior art date
Application number
PCT/JP2000/003014
Other languages
English (en)
Japanese (ja)
Inventor
Masato Ishii
Original Assignee
Fujitsu Limited
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 Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP2000/003014 priority Critical patent/WO2001085461A1/fr
Publication of WO2001085461A1 publication Critical patent/WO2001085461A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/10—Sheet holders, retainers, movable guides, or stationary guides
    • B41J13/103—Sheet holders, retainers, movable guides, or stationary guides for the sheet feeding section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/12—Guards, shields or dust excluders
    • B41J29/13—Cases or covers

Definitions

  • the present invention generally relates to an image forming apparatus, and more particularly to a mechanical means for facilitating maintenance of an electrophotographic image forming apparatus.
  • the "electrophotographic image forming apparatus” is an apparatus utilizing the Carlson process described in U.S. Pat. No. 2,297,691, and is typically a laser printer.
  • a non-impact image forming apparatus that records by attaching a developer as a recording medium to a recording medium (printing paper, transparencies, etc.).
  • the present invention is suitable, for example, for a laser printer having a paper feed cassette.
  • a laser printer which is one of the electrophotographic image forming apparatuses, has features such as excellent operability and economy, and capable of forming high-quality images. In addition, since it has less vibration and noise during printing, it is widely used in computer output terminals, copy machines, and the like following the development of office automation in recent years.
  • the laser printer typically has a paper feeder and an image forming unit. Further, the image forming section has a pre-charger, a photoreceptor (a drum or a belt), an optical unit, a developing device, a transfer device, and a fixing device.
  • the paper feeding device is, for example, an automatic paper feeding device (ADF: Auto D e c u m e n t F e d e d er), and separates one sheet from a plurality of sheets and supplies it to the image forming unit.
  • ADF automatic paper feeding device
  • laser printers have adopted a cassette paper feeding system that uses a paper cassette that stores recording paper as the paper feeding means. The paper is discharged from the paper feeding device through the image forming unit, after the image is formed.
  • the photoreceptor is uniformly charged (for example, to 160 V) by the pre-charging unit.
  • the optical unit forms a latent image by exposure on the photoreceptor charged by the pre-charger. More specifically, the optical unit emits light from a light source Then, the potential of the irradiated portion is changed to, for example, about 150 V to form an electrostatic latent image on the photoconductor.
  • the latent image is then visualized as a toner image via a developing device.
  • the transfer device uses, for example, a transfer roller to transfer a toner image to a sheet conveyed from a sheet feeding device.
  • the toner image transferred to the paper is fixed by a fixing device, and then the printing paper is discharged. During such a series of image forming processes, paper may be jammed for some reason.
  • the laser printer stops its operation and displays information to that effect on a display panel equipped with a liquid crystal or LED.
  • the user performs jam processing according to the display.
  • the location where the jam occurs is roughly classified into an image forming area and a paper feeding area.
  • image forming area paper and rollers are often pressed against each other in the processes such as transfer and fixing, so that a jam occurs.
  • the top cover close to the image forming unit is opened, and the jammed paper is removed.
  • the top cover is provided with a sensor for detecting opening and closing, and if the cover is open, this fact is displayed on the display panel.
  • the laser printer displays information indicating that operation is possible and restarts.
  • One way to indicate that the user has forgotten to close the back cover is to provide a sensor that detects whether the cover is open or closed.
  • Such sensors use, for example, microswitches, Detects that the back cover is not closed (open) and displays it on the display panel to notify the user. The user closes the back cover according to this display.
  • the image forming apparatus cannot operate while the display is displayed on the display panel, so that it is possible to prevent the occurrence of a new jam or the discharge of the sheet.
  • jam processing in a conventional image forming apparatus using the above-described means has a problem.
  • a sensor for detecting whether the cover is opened or closed is provided, so that an increase in cost has been a problem.
  • such means have been difficult to apply to inexpensive devices for home users.
  • the means for automatically closing the opening / closing cover the user has to use one hand to keep the cover open during jam processing, so it is difficult to clear the jam. Also, if the force of the magnet catch or the spring is too strong, the user may pinch his hand, which is dangerous.
  • a cover opening / closing mechanism as an exemplary embodiment of the present invention includes an image to be recorded by attaching a recording medium to a recording medium conveyed from a detachable paper cassette.
  • a cover opening / closing mechanism used in a forming apparatus wherein the image forming apparatus includes: A cover that is openably and closably attached to the apparatus; and a unit that is connected to the cover and mechanically pushes the sheet cassette out of the image forming apparatus in synchronization with the opening operation of the cover.
  • a cover opening / closing mechanism as another exemplary embodiment of the present invention is a cover opening / closing mechanism of an image forming apparatus that records by attaching a recording medium to a recording medium conveyed from a detachable paper feed cassette.
  • the cover opening / closing mechanism the cover closes in synchronization with the operation of pushing the paper cassette, so that the operation of the user can be simplified.
  • the cover opening / closing mechanism is mechanically configured, so that the cost can be reduced.
  • An image forming apparatus as an exemplary embodiment of the present invention includes a housing, a paper cassette detachably mounted on the housing, a sensor for detecting the presence or absence of the paper cassette, and an opening with respect to the housing.
  • a cover that is opened to remove the jam when the jam of the recording medium conveyed from the sheet cassette occurs, and is connected to the cover to synchronize with the opening operation of the cover.
  • Such an image forming apparatus has the same operation as the above-described cover opening / closing mechanism, and a sensor that detects the presence or absence of a sheet cassette during jam processing can indirectly detect a state in which the cover is open. Therefore, forgetting to close the cover can be prevented.
  • An image forming apparatus includes a housing, a paper feed cassette detachable from the housing, a sensor for detecting the presence or absence of the paper feed cassette, and a housing.
  • a cover that is provided so as to be openable, and that is opened to remove the jam when a jam of the recording medium conveyed from the paper feed cassette occurs, and that the cover is opened when the paper feed cassette is attached to the housing. Means for closing mechanically.
  • Such an image forming apparatus has the function of the above-mentioned governor opening / closing device, and feeds paper during jam clearance. Since the cover closes in synchronization with the operation of pushing the cassette, the operation of the user can be simplified.
  • FIG. 1 is a schematic sectional view of an image forming apparatus having a cover opening / closing mechanism as an exemplary embodiment of the present invention.
  • FIG. 2 is a schematic cross-sectional view showing a state in which a back cover of the cover opening / closing mechanism of FIG. 1 is closed.
  • FIG. 3 is a schematic plan view of FIG. 2 as viewed from above.
  • FIG. 4 is a schematic cross-sectional view showing a state where a back cover of the cover opening / closing mechanism of FIG. 2 is open.
  • FIG. 5 is a schematic plan view of FIG. 4 as viewed from above.
  • FIG. 6 is a schematic cross-sectional view showing a state where a sheet cassette of the cover opening / closing mechanism of FIG. 2 is pulled out.
  • FIG. 7 is a schematic plan view of FIG. 6 as viewed from above.
  • FIG. 8 is a schematic cross-sectional view showing a modified example of the cover opening / closing mechanism in FIG. 2 in a state where a back cover is closed.
  • FIG. 9 is a schematic plan view of FIG. 8 as viewed from above.
  • FIG. 10 is a schematic sectional view showing a state in which a back cover of the cover opening / closing mechanism of FIG. 8 is open.
  • FIG. 11 is a schematic plan view of FIG. 10 as viewed from above.
  • FIG. 12 is a schematic sectional view showing a state in which the sheet cassette of the cover opening / closing mechanism in FIG. 8 is pulled out.
  • FIG. 13 is a schematic plan view of FIG. 12 viewed from above.
  • FIG. 1 is a schematic sectional view of a laser printer 300 having a cover opening / closing mechanism 100 as an exemplary embodiment of the present invention.
  • FIG. 2 is a schematic sectional view showing a state in which the rear cover 110 of the cover opening / closing mechanism 100 in FIG. 1 is closed.
  • FIG. 3 is a schematic plan view of FIG. 2 as viewed from above.
  • FIG. 4 is a schematic sectional view showing a state in which the back cover 110 of the cover opening / closing mechanism 100 in FIG. 2 is open.
  • FIG. 5 is a schematic plan view of FIG. 4 as viewed from above.
  • FIG. 1 is a schematic sectional view of a laser printer 300 having a cover opening / closing mechanism 100 as an exemplary embodiment of the present invention.
  • FIG. 2 is a schematic sectional view showing a state in which the rear cover 110 of the cover opening / closing mechanism 100 in FIG. 1 is closed.
  • FIG. 3 is a schematic plan view of FIG. 2 as viewed from above.
  • FIG. 6 is a schematic cross-sectional view showing a state where the paper feed cassette 310 of the cover opening / closing mechanism 100 of FIG. 2 has been pulled out.
  • FIG. 7 is a schematic plan view of FIG. 6 as viewed from above.
  • the same reference numerals denote the same members, and a duplicate description will be omitted.
  • the laser printer 300 includes a paper feed cassette 310, a paper feed tray 315, a paper feed roller 320, a cover opening / closing mechanism 100, and a registration roller 3100. 30, an image forming unit 200, and a housing 340. Further, the housing 340 is provided with a display panel 342 surrounded by a dotted line, and displays various states of the image forming apparatus. However, the printing paper P is transported upward from below in FIG.
  • the laser printer 300 is embodied as an electrophotographic printer that employs a multi-stage paper feeding method having a plurality of paper feed cassettes 310, but in FIG. 3 1 0 is omitted.
  • the paper cassette 310 stores a stack L P of paper P.
  • the paper feed cassette 310 can be attached to and detached from the main body of the laser printer 300, so that the supply and replacement of the paper P can be easily performed. If the paper cassette 310 is out of the printer 300 for some reason, a message such as “no paper cassette” or “no paper” is displayed on the display panel 3 by the sensor 302 described later. It is communicated to the user through 42. At this time, the laser printer 300 temporarily stops operating because no paper is supplied.
  • the storage capacity of the paper P in the paper feed cassette 310 is usually about 100 to 500 sheets.
  • several paper feed cassettes 310 are provided for each size of the paper P, but there are some paper feed cassettes 310 that can handle several types of sizes.
  • the paper feed cassette 310 has a shape such that a part thereof projects from the housing 340 when it is mounted.
  • the present invention is not limited to this. And may form part of the enclosure 340.
  • the paper feed cassette 310 has a corner separator 31 2 (shown in FIG. 3), side fences 3 14 and end fences 3 16 (not shown), and a bottom plate 3 18.
  • the corner separator 312 is typically installed on the side fence 314 to separate the laminated paper LP from the fed paper P.
  • the side fences 3 14 and the end fences 3 16 can be moved freely, and for example, settings corresponding to A4 size paper P can be made.
  • the bottom plate 318 is a place on which the paper P is placed.If the friction coefficient of the bottom plate 318 is low, the paper P is sent out in a bundle when the remaining amount of the paper P decreases. May be In order to prevent this, a pad as a wear-resistant friction member is attached to a portion facing a paper feed port 320, which will be described later.
  • the stacked body L P of the paper P is stacked with one end of the paper P abutted.
  • the paper tray 315 is connected to the main body of the laser printer 300, and the user supplies paper P thereon.
  • the paper feed tray 315 is often used to feed paper P of a special size that is not normally used.
  • the paper feed roller 320 is installed on a stacked body LP of the paper feed cassette 310 and the paper feed tray 315, and is configured by a rotatable roller.
  • the paper feed roller 320 is arranged so as to contact the uppermost sheet P of the sheet stack LP and apply a slight pressing force to the sheet stack LP.
  • the paper feed rollers 320 release the pressing force against the paper P when the paper feed cassette 310 is inserted, or temporarily retract from the paper P, thereby improving the operability of the paper cassette 310. Have improved.
  • the paper feed roller 320 rotates counterclockwise in FIG. 1 and feeds the paper P on the top of the stacked body LP into the subsequent device.
  • the material of the paper feed roller 320 has a large friction coefficient, such as rubber, so that the upper paper P can be separated from the stacked body LP by a frictional force larger than the electrostatic force between the stacked papers P. It is preferable to select one. Further, in order to increase the apparent friction coefficient, a method has been proposed in which a hole is formed in the roller 320, air is sucked from outside, and a projection is provided.
  • a groove is formed on the surface of the paper feed roller 320 to make it difficult for paper dust to collect.
  • the paper feed roller 3 2 0 May be configured in a belt shape to improve durability.
  • the cover opening / closing mechanism 100 performs the processing.
  • the cover opening / closing mechanism 100 will be described in detail below.
  • the cover opening / closing mechanism 100 of the present invention has a cover 110, a first gear 120, a second gear 130, and a shaft 140.
  • the force bar opening / closing mechanism 100 further includes a sensor 302 and a contact portion 30 connected to the sensor 302.
  • the sensor 302 can detect the presence or absence of contact between the contact portion 30 and the paper feed cassette 310 using various media such as light, magnetism, and electricity.
  • a microswitch, a proximity switch, and a photosensor are used as the sensor 302, for example, a microswitch, a proximity switch, and a photosensor are used.
  • the cover 110 is also called a rear cover, and is provided for processing jammed paper.
  • the cover 110 forms a transport path R for the paper P, as shown in FIG. 2, and the paper P is transported from the paper cassette 310 to the image forming unit 200. It has a guide mechanism for the road.
  • the cover 110 forms a transport path R for both the paper cassette 310 for storing the paper P1 and the paper cassette 310a for storing the paper P2. ing.
  • the cover 110 forms a part of the housing 340.
  • the cover 110 typically has a handle with which the user can manually open the cover 110. As shown in FIG. 4, when the user opens in the direction of arrow A around the fulcrum 1 1 2 of the cover 110 (the fulcrum 1 2 2 of the first gear 120), the jam paper J Is exposed and can be removed from the printer 300. At this time, in the cover opening / closing mechanism 100 of the present invention, the first gear 120 rotates in synchronization with the opening of the cover 110.
  • the cover 110 further includes a physical limiter (not shown) to prevent the cover from opening beyond a predetermined position.
  • the first gear 1 220 has a fulcrum 1 2 2, and is clockwise around the fulcrum 1 2 2 (Direction of arrow B in Fig. 4).
  • the fulcrum 1 2 2 is connected to or integrally formed with the fulcrum 1 1 2 of the cover 110. Therefore, the cover 110 rotates in the direction of arrow B in synchronization with the rotation of the cover 110 as shown in FIG. 4, and the rotation angle is the same as that of the cover 110.
  • the first gear 120 is provided outside the transport path R in order to smoothly transport the paper P. That is, as shown in FIG. 3, the first gear 120 is mounted on the housing 340 outside the paper feed cassette 310 and rotatably. Further, as shown in FIGS.
  • the second gear 130 is provided to move a shaft 140 described later provided inside the second gear 130 and to push out the paper feed cassette 310.
  • the second gear 130 is installed so as to correspond to the first gear 130, and rotates counterclockwise (in the direction of arrow C in FIG. 4) about the fulcrum 132.
  • the second gear 130 is connected to the housing 340 via a mounting member 134.
  • the shaft 140 abuts on the end of the paper cassette 310, and the movement thereof can push the paper cassette 310 in the direction D.
  • the size of the shaft 140 is determined by the weight and size of the paper cassette 310. As shown in Fig. 3, the length of the shaft 140 is not so much needed to push out the paper feed set 310. On the other hand, considering the weight of the paper feed cassette 310, the shaft 1 It is desirable to make 40 thicker.
  • the shaft 140 of the present embodiment had a hollow structure inside and a large outside diameter. Further, in the present embodiment, the sheet feeding force set 3 10 pushed out by the shaft 140 is the sheet feeding cassette 3 10 for stacking the paper P 1, but the sheet feeding cassette 3 10 for stacking the paper P 2 It may be 310 a.
  • the second gear 130 has a larger number of teeth than the first gear 120. This is because the paper feed cassette 310 is pushed out with a light force for opening the cover due to the gear ratio. Further, the load applied to the fulcrum 1 2 2 of the first gear 120 (the fulcrum 1 1 2 of the cover 1 110) can be reduced by the gear ratio of the gears 120 and 130. . For this reason, it is desirable that the fulcrums 112 and 122 be set thicker to further reduce the applied load. 6 and 7 show the cover opening / closing mechanism 100 when the paper feed cassette 310 is deviated from the laser printer 300 for replenishment and replacement of the paper P.
  • FIG. 8 is a schematic cross-sectional view showing a state in which the rear force par 110 of the cover opening / closing mechanism 110a of the modification of FIG. 2 is closed.
  • FIG. 9 is a schematic plan view of FIG. 8 as viewed from above.
  • FIG. 10 is a schematic sectional view showing a state in which the back cover 110 of the cover opening / closing mechanism 100a in FIG. 8 is open.
  • FIG. 11 is a schematic plan view of FIG. 10 viewed from above.
  • FIG. 12 is a schematic cross-sectional view showing a state where the sheet cassette 310 of the cover opening / closing mechanism 110a in FIG. 8 is pulled out.
  • FIG. 13 is a schematic plan view of FIG. 12 viewed from above.
  • the cover opening / closing mechanism 100 a includes a cover 110, a first gear 120 a, a second gear 130, a shaft 140, a sensor 302, and a connection part 3. 0 and 4.
  • elements 110, 130, 140, 304, and 304 other than the first gear 120a of the cover opening / closing mechanism 100a correspond to the cover opening / closing mechanism 100. Since it is the same, detailed description is omitted.
  • 8 to 13 showing the cover opening / closing mechanism 100a correspond to FIGS. 2 to 7 showing the power bar opening / closing mechanism 100, respectively.
  • the shape of the first gear 120a is semicircular so as not to protrude from the cover 110 or the housing 340. This can prevent the user from being injured by the gear of the gear 130a. In addition, the space for installing the laser printer 300 can be saved because it does not protrude.
  • FIGS. 12 and 13 show the paper feed cassette 310 when the paper feed cassette 310 is detached from the laser printer 300 in order to supply and replace the paper P. I have.
  • the cover opening / closing mechanism 100a can be moved from the paper cassette 310a or the paper tray 315 even if the paper cassette 310 is removed. Is possible.
  • the cover opening / closing mechanism 100 of the present invention when the cover 110 is opened, the paper feed cassette 310 is pushed out of the pudding 300 in synchronization with the opening, so that the cover 110 is opened.
  • the status of “closed” can be indirectly known by the display on the display panel 342 of the printer 300.
  • the cover 110 is closed in synchronism therewith, so that the cover 110 can be prevented from being forgotten to close. Further, even if the paper cassette 310 is pulled out for replenishment or replacement of the paper P, the cover 110 can be kept closed without synchronizing with it.
  • the cover opening / closing mechanism 100 of the present invention all of the elements 120 to 140 are formed by mechanical parts. According to such a configuration, the cost can be reduced as compared with the case where a sensor for the cover 110 requiring electric components is provided. Accordingly, the cover opening / closing mechanism 100 can prevent forgetting to close the opening / closing cover while enabling cost reduction.
  • the registration roller 330 aligns the leading edge of the sheet P supplied from the sheet cassette 310 or the tray 315 with the leading edge of the image formed by the image forming unit 200 at the subsequent stage. Further, the registration rollers 330 can also correct the skew (skew) with respect to the transport direction. Stopped registration rollers 3 3 0, paper? The skew is corrected by hitting the tip of the skew. Thereafter, the registration roller 330 rotates at the timing when the leading edge of the image and the leading edge of the paper match, and is conveyed to the image forming section 200.
  • the registration roller 330 also has a function of synchronizing the transport speed of the paper P with the peripheral speed of the photosensitive drum 210 described later.
  • the image forming unit 200 includes a photosensitive drum 210, a charger 220, an optical unit 230, a developing device 240, a transfer port 250, and a cleaning unit 26. 0, heat roller 2 7 0, And a discharge roller 280.
  • the photosensitive drum 210 has a photosensitive dielectric layer on a rotatable drum-shaped conductor support, and is used as an image holding member.
  • the photoreceptor drum 210 is formed by applying a function-separated type organic photoreceptor to a drum-like aluminum surface to a thickness of about 20 ⁇ m.
  • the charger 220 has a characteristic that a fixed amount of charge is applied to the surface of the photosensitive drum 210 by a charging roller. This makes it possible to uniformly charge the surface of the photosensitive drum 210 at about ⁇ 600 V.
  • the optical unit 230 uses a semiconductor laser as a light source, and exposes the photosensitive drum 210 with light corresponding to an image to be recorded.
  • the exposure neutralizes the charged potential on the surface of the photoconductor drum 210 and forms a latent image corresponding to the image data of the image to be recorded.
  • the optical unit 230 can employ any exposure method known in the art (for example, a mechanical scanning method or a fixed scanning method).
  • the developing device 240 uses a developer to supply a developer (for example, a toner), which is fine charged particles, supplied from a toner cartridge to the photosensitive drum, and charges the photosensitive drum 210 with the charged toner.
  • a developer for example, a toner
  • a toner image is formed on the photoreceptor drum 210 by the electrostatic force between the developer and the developing agent, and the toner image is visualized. It does not matter whether the toner is a single component or a two-component (that is, includes a carrier).
  • the transfer roller 250 generates an electric field that electrostatically attracts toner, and uses the transfer current to transfer the toner image attracted on the photosensitive drum 210 to the paper Pc
  • the cleaning unit 260 collects and discards the toner remaining on the photosensitive drum 210 after the transfer, or returns the collected toner to the toner cartridge if necessary. In addition, it is provided to prevent dust such as paper other than toner from being charged in the developing device, adversely affecting the charging of the toner, and reducing the printing performance.
  • the cleaning unit 260 can use various energies including magnetism and rubber friction to remove the toner and the charge on the photosensitive drum 210.
  • Heat - Toro - La 2 7 0 is a device to fix the toner permanently on the sheet P.
  • the transferred toner adheres to the paper P with a weak force and easily peels off. Therefore, the toner is fixed using energy such as pressure and heat. By applying energy, solid toner spreads, spreads, penetrates, and completes fixing. Complete.
  • the paper discharge roller 280 discharges the paper P on which the image formation has been completed from the printing paper 300 to the discharge tray 282.
  • the operation of the laser printer 300 having the cover opening / closing mechanism 100 will be described.
  • the paper P is first supplied.
  • the rotating paper feed roller 320 contacts the paper P, or when the paper feed roller 320 contacts the paper P, the drawing operation starts and the upper part of the laminated body LP is started.
  • Paper P is fed into the printer 300.
  • the cover 110 forms the transport path R.
  • the laser printer 300 displays the fact on the display panel 342 and stops the operation. The user recognizes the occurrence of the jam paper J and opens the cover 110.
  • the paper J is visible when the force bar 110 is opened, pull out the paper J and discharge it out of the printer 300. If it is difficult to pull out the paper J, the entire paper cassette 310 may be pulled out and the paper P may be discharged from the paper cassette 310.
  • the cover opening / closing mechanism 100 of the present invention is interlocked with the opening / closing of the cover 110.
  • the first gear 120 and the second gear 130 rotate in synchronization with each other, and contact the shaft 140. Push out the paper feed cassette 3 10 that is in contact.
  • the paper feed cassette 310 is separated from the contact portion 304 of the sensor 302.
  • the sensor 302 detects that the paper cassette 310 has been removed and displays a message such as ⁇ no paper cassette '' or ⁇ no paper '' on the laser printer 300. Performed by panel 3 4 2. Thereafter, the user finds the jam paper J and ejects the paper J.
  • the user pushes the ejected paper cassette 310 into the original position, and turns off the display on the display panel 3422 of the laser printer 300.
  • the shaft 140 is pressed, and the second gear 130 and the first gear 1 are synchronized with the movement of the shaft 140. 20 rotates and closes cover 110. Also, close the cover 110 manually and then push in the paper feed cassette 310 to display the laser printer 300 display panel 3 4 2 The indication may be turned off.
  • the cover 110 is closed as shown in FIGS. Even after being fed, the paper cassette 310 remains pushed out. Therefore, the laser printer 300 displays “No paper cassette” or “No paper” on the display panel 342 even after ejecting the jammed paper J. For this reason, the user pushes the paper supply cassette 310 to a desired position in accordance with this display, and makes the paper cassette 310 come into contact with the contact portion 304. As a result, the display on the display panel 342 of the laser printer 300 disappears, and the laser printer becomes operable. As described above, the processing of the jammed paper is completed through a series of operations.
  • the paper is conveyed to the registration roller 330 through the conveyance path R.
  • the sheet P whose leading end has been adjusted or the skew has been corrected by the registration roller 330 is conveyed to the image forming section 200 at the subsequent stage.
  • the photosensitive drum 210 is uniformly charged to a negative electrode (about ⁇ 600 V) by a charger 220.
  • a charger 220 When the photoconductor drum 210 is irradiated with a laser beam from the optical unit 230, uniform charging on the photoconductor drum 210 loses a portion corresponding to an image by exposure to the laser beam. After the completion of the exposure, a latent image is formed on the surface of the photosensitive drum 210.
  • the latent image is developed by the developing device 240. That is, the charged particles (or powder) of the toner are attracted to the surface of the photosensitive drum 210 at the portion where the charge has disappeared by using the electrostatic force. As a result, the latent image on the photosensitive drum 210 is visualized as a toner image.
  • the toner image is transferred to the sheet P conveyed to the transfer roller 250 with good timing. As a result, the toner image on the surface of the photosensitive drum 210 is sucked and adhered to the paper P, and the toner image is transferred to the paper P.
  • the remaining toner on the photosensitive drum 210 is collected by the cleaning unit 260. After that, the toner on the paper P is permanently fixed by passing through the roller 270, and then is discharged to the outside of the laser printer 300 by using the discharge roller 280. You.
  • the preferred embodiments of the present invention have been described above. However, it goes without saying that the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist.
  • the present invention is suitable for, for example, a copying machine in which a plurality of paper cassettes can be attached and detached. Can be used. Industrial applicability
  • the present invention generally relates to an image forming apparatus, and more particularly to a mechanical means for facilitating maintenance of an electrophotographic image forming apparatus.
  • the present invention is suitable for, for example, a laser printer having a paper feed cassette or a copying machine.

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Abstract

Cette invention se rapporte à un mécanisme d'ouverture/fermeture de couvercles et à un dispositif d'impression, capables d'empêcher facilement et de manière économique les défaillances de fermeture d'un couvercle d'ouverture/fermeture au moment du traitement de situations de blocage. Ainsi, lorsque le couvercle d'ouverture/fermeture est ouvert, une cassette d'alimentation de papier est amenée à sortir de force du dispositif d'impression en synchronisme avec l'ouverture du couvercle, et toute défaillance de fermeture du couvercle d'ouverture/fermeture est détectée par un capteur détectant la présence ou l'absence de la cassette d'alimentation de papier.
PCT/JP2000/003014 2000-05-11 2000-05-11 Mecanisme d'ouverture/fermeture de couvercles et dispositif d'impression WO2001085461A1 (fr)

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PCT/JP2000/003014 WO2001085461A1 (fr) 2000-05-11 2000-05-11 Mecanisme d'ouverture/fermeture de couvercles et dispositif d'impression

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PCT/JP2000/003014 WO2001085461A1 (fr) 2000-05-11 2000-05-11 Mecanisme d'ouverture/fermeture de couvercles et dispositif d'impression

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07112848A (ja) * 1993-10-20 1995-05-02 Canon Inc シート給送装置及び画像形成装置
JPH10231031A (ja) * 1997-02-20 1998-09-02 Ricoh Co Ltd 画像形成装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07112848A (ja) * 1993-10-20 1995-05-02 Canon Inc シート給送装置及び画像形成装置
JPH10231031A (ja) * 1997-02-20 1998-09-02 Ricoh Co Ltd 画像形成装置

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