JP4781753B2 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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JP4781753B2
JP4781753B2 JP2005249018A JP2005249018A JP4781753B2 JP 4781753 B2 JP4781753 B2 JP 4781753B2 JP 2005249018 A JP2005249018 A JP 2005249018A JP 2005249018 A JP2005249018 A JP 2005249018A JP 4781753 B2 JP4781753 B2 JP 4781753B2
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opening
exposure
closing lid
image forming
rotation
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JP2007065125A (en
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康二 相田
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株式会社沖データ
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Description

  The present invention relates to an image forming apparatus such as an electrophotographic printer, and more particularly to an image forming apparatus in which a top cover (open / close cover) is configured to hold an LED head.

  Conventionally, in an electrophotographic printer using an LED (light emitting diode) head, an opening / closing cover that can be rotated about one side is provided at the upper part of the apparatus, and an LED head assembly having an LED head is disposed on the inner surface of the opening / closing cover. A photosensitive unit in which the photosensitive drum, charging unit, developing unit, and toner cartridge are detachably disposed in the opening / closing unit of the apparatus, and the light emitting surface of the LED head is the photosensitive drum when the opening / closing cover is closed. There has been an electrophotographic printer having a structure in which the image is disposed at a position where exposure can be performed. In this type of electrophotographic printer, in order to form an image using a plurality of color toners, a photosensitive unit and an LED head are prepared for each color toner, and a recording medium is provided in the apparatus main body or the opening / closing cover. Were arranged side by side in the transport direction. (For example, see Patent Document 1)

JP 2001-255803 A (page 3, FIG. 4)

  In the color electrophotographic printer as described above, the opening / closing cover is opened to perform maintenance work such as paper jam release and removal of the photosensitive unit. However, the opening angle of the opening / closing cover is limited due to the structure of the printer device. In this case, there is a problem that the LED head assembly protruding vertically downward from the opening / closing cover hinders smooth maintenance work.

An image forming apparatus according to the present invention is an image forming apparatus provided with an opening / closing lid that is rotatably arranged with respect to the apparatus main body.
A plurality of exposure means pivotally supported on the inside of the opening / closing lid so that the longitudinal direction thereof is substantially parallel to the rotation axis of the opening / closing lid and the longitudinal direction as an axial direction; A plurality of rotation mechanisms that transmit a rotation driving force to the exposure means, respectively, and the rotation mechanisms are driven to rotate the exposure means in a direction from the operating position toward the retracted position in conjunction with the opening operation of the opening / closing lid. A drive mechanism that moves and rotates the exposure means in a direction from the retracted position toward the operating position in conjunction with the closing operation of the open / close lid;
The driving mechanism starts driving the rotating mechanism after the opening angle reaches a predetermined opening angle when the opening / closing lid is opened.
The plurality of rotation mechanisms and the drive mechanism are configured such that a rotation amount by which the exposure unit rotates by the drive mechanism when the opening / closing lid is opened / closed is that of the first and second exposure units of the plurality of exposure units. It is characterized by being different from each other.

Another image forming apparatus according to the present invention is an image forming apparatus provided with an open / close lid that is rotatably arranged with respect to the apparatus main body.
A plurality of LED head assemblies pivotally supported on the inner surface of the opening / closing lid so that the longitudinal direction thereof is substantially parallel to the rotation axis of the opening / closing lid and the longitudinal direction as an axial direction; A plurality of rotation mechanisms for transmitting a rotation driving force to each LED head assembly, and each of the rotation mechanisms is driven to move the LED head assembly from the operating position to the retracted position in conjunction with the opening operation of the opening / closing lid. A drive mechanism that rotates in a direction and rotates the LED head assembly in a direction from the retracted position to the operating position in conjunction with the closing operation of the opening / closing lid,
The driving mechanism starts driving the rotating mechanism after the opening angle reaches a predetermined angle when the opening / closing lid is opened.
The plurality of rotation mechanisms and the drive mechanism are configured such that a rotation amount by which the LED head assembly is rotated by the drive mechanism when the opening / closing lid is opened and closed is the first and second LEDs of the plurality of LED head assemblies. The head assemblies are configured to be different from each other.

  According to the present invention, since the exposure means rotates toward the retracted position when the opening / closing lid is opened beyond the predetermined opening, even when the full opening angle of the opening / closing lid is restricted, It is possible to smoothly perform the work related to the inside of the apparatus main body without being obstructed, and to rotate without hitting the components inside the apparatus main body.

Embodiment 1 FIG.
FIG. 1 is a main part configuration diagram schematically showing a main part configuration of an image forming apparatus according to the present invention.

  An image forming apparatus 1000 shown in FIG. 1 has a configuration as a color electrophotographic printer, for example. In the figure, a paper feed tray 100 is detachably attached to the main body of the image forming apparatus 1000 and accommodates recording paper 101 stacked therein. Inside the paper feed tray 100, a paper placement plate 102 is rotatably provided on the support shaft 102a, and more than half of the recording paper 101 on the feeding side is placed on the paper placement plate 102. Further, the paper feed tray 100 is provided with a guide member (not shown) that regulates the stacking position of the recording paper 101, and the direction and the paper orthogonal to the feeding direction of the recording paper 101 (the negative direction of the X axis in the figure). The side surface of the paper is regulated in the feeding direction, and the stacking position of the recording paper 101 to be stored is kept constant.

  On the feeding side of the paper feed tray 100, a lift-up lever 104 that is rotatably provided on the support shaft 104a is provided. The support shaft 104a is engaged with the motor 105 so as to be able to contact and separate. When the paper feed tray 100 is mounted on the main body of the image forming apparatus 1000, the lift-up lever 104 and the motor 105 are engaged, and a control unit (not shown) drives the motor 105. As the lift-up lever 104 rotates, the tip of the lift-up lever 104 lifts the bottom of the paper stacking plate 102, and the recording paper 101 stacked on the paper stacking plate 102 rises. When the recording paper 101 rises to a certain height, the rise detection unit 106 detects it, and a control unit (not shown) stops the motor 105 based on the detected information.

  A paper feeding unit 200 that feeds the recording paper 101 one by one is provided on the feeding side of the paper feed tray 100. The paper feeding unit 200 includes a pickup roller 201 provided so as to be pressed against the recording paper 101 raised to a certain height, a feed roller 202 and a retard roller for separating the recording paper 101 fed by the pickup roller 201 one by one. 203 roller pairs are provided. Further, the paper feeding unit 200 is provided with a paper presence / absence detecting unit 204 that detects the presence / absence of the recording paper 101 and a remaining paper amount detecting unit 205 that detects the remaining amount of paper.

  The recording paper 101 that has been fed out from the paper feeding unit 200 by one sheet is sent to the paper transport unit 300. The fed recording paper 101 passes through the paper sensor 301 and is sent to the conveying roller pair 302. The conveyance roller pair 302 is started to rotate by a driving unit (not shown) at a timing delayed by a predetermined time from the time when the recording paper 101 passes the paper sensor 301. For this reason, the recording sheet 101 is pushed into the pressure contact portion of the conveying roller pair 302 in a slightly bent state, and the skew is corrected. The recording paper 101 sent out from the transport roller pair 302 passes through the paper sensor 303 and is sent to the transport roller pair 304. The conveyance roller pair 304 is rotated by a driving unit (not shown) from the time when the recording paper 101 passes through the paper sensor 303 and feeds the recording paper 101 without stopping. The recording paper 101 sent out by the conveying roller pair 304 passes through the writing sensor 305 and is sent to the image forming unit 400.

  The image forming unit 400 includes four toner image forming units 430 arranged in series, and a transfer unit 460 that transfers the toner image formed by the toner image forming unit 430 to the upper surface of the recording paper 101 by Coulomb force. The four toner image forming units 430 arranged in series have the same configuration, and only the colors of the toners used, that is, yellow (Y), magenta (M), cyan (C), and black (K) only. Is different. Therefore, for the sake of simplicity, only the yellow (Y) toner image forming unit 430 is shown in the configuration, and the other toner image forming units 430 are omitted, and only the photosensitive drum 431 is shown.

  The toner image forming unit 430 includes an LED head 3 including a photosensitive drum 431 that carries a toner image, a charging roller 432 that charges the surface of the photosensitive drum 431, and an LED array that forms an electrostatic latent image on the surface of the charged photosensitive drum 431. A developing roller 434 that forms a toner image on the electrostatic latent image by frictional charging; a toner supply unit 436 that feeds toner; and a cleaning blade 435 that scrapes off residual toner remaining on the surface of the photosensitive drum 431 after transfer. As will be described later, the LED head 3 is held by an inner frame 1 (FIG. 2) that is rotatably arranged with respect to the image forming apparatus 1000 main body.

  The transfer unit 460 is paired with a transfer belt 461 that electrostatically attracts and conveys a sheet, a drive roller 462 that is rotated by a drive unit (not shown) to drive the transfer belt 461, and a drive roller 462. A tension roller 463 that is stretched, a transfer roller 464 that is disposed so as to be in pressure contact with the photosensitive drum 431 of the toner image forming unit 430 and applies a voltage to transfer the toner image onto the recording paper 101, and a transfer belt 461. A cleaning blade 465 for scraping and cleaning the adhering toner and a toner box 466 for accumulating the toner scraped off by the cleaning blade 465 are provided.

  The toner image forming unit 430 and the transfer belt 461 are driven in synchronization, and the respective color toner images are sequentially superimposed and transferred onto the recording paper 101 electrostatically attracted to the transfer belt 461. The recording paper 101 onto which the image has been transferred in the image forming unit 400 in this manner is sent to the fixing unit 500 that adheres the toner image to the recording paper 101 with heat and pressure.

  The fixing unit 500 includes a halogen lamp 503 serving as a heat source therein, and includes a roller pair of an upper roller 501 and a lower roller 502 whose surfaces are formed of an elastic body, and the toner on the recording paper 101 sent from the image forming unit 400. Heat and pressure are applied to the image to melt the toner image and fix it on the recording paper 101. Thereafter, the recording paper 101 is discharged to the stacker unit 505 by the discharge roller pair 504.

  An MPT (Multi Purpose Tray), that is, a manual feed tray 600 is provided as a second paper feeding unit. The manual feed tray 600 corresponds to a thin paper, a thick paper, a narrow paper, a long paper, a special medium, and the like, which cannot be handled by the paper feed tray 100, and is often used in various ways. In particular, when paper is fed from the paper feed tray 100, there is a paper travel route that is largely curved by the paper transport unit 300, so that the paper travel load increases. For this reason, a straight path structure that can be achieved by using the manual feed tray 600 is utilized for thick paper that is stiff and long paper that cannot fit in the paper feed cassette 100.

  The manual feed tray 600 is rotatably mounted on the main body of the image forming apparatus 1000 and is opened when used, and recording sheets 601 are stacked. When the manual feed tray 600 is opened, a pickup roller described later is pulled out from the inside of the apparatus by a hopper mechanism (not shown). In the manual feed tray 600, a paper placement plate 602 is rotatably provided on the support shaft 602a, and the stacked recording paper 601 is stacked on the paper placement plate 602. The manual feed tray 600 is provided with a guide member (not shown) that regulates the stacking position of the recording sheets 601, and the sheets in the direction orthogonal to the feeding direction of the recording sheets 601 (the positive direction of the X axis in the drawing) and the sheet feeding direction. The side surface is regulated and the placement position is kept constant on the recording paper 601 to be stored. Further, the manual feed tray 600 has an auxiliary tray (not shown) in order to stack long sheets in the sheet running direction.

  A mechanism (not shown) for controlling the position of the recording paper 601 on the paper placement plate 602 rotatably provided on the support shaft 602a is provided on the paper feed side of the manual feed tray 600, and the paper placement plate. The height of the tip of 602 is controlled.

  On the paper feeding side of the manual feed tray 600, a paper feeding unit 700 that feeds the recording paper 601 one by one is provided. This has the same function as the paper feeding unit 200 described above. The paper feeding unit 700 includes a pickup roller 701 provided so as to be pressed against the recording paper 601 raised to a certain height, a feed roller 702 that separates the recording paper 601 fed by the pickup roller 701 one by one, and a retard roller 703. A roller pair is provided. Further, the paper feeding unit 700 is provided with a paper presence / absence detection unit (not shown) that detects the presence or absence of the recording paper 601 and a paper remaining amount detection unit (not shown) that detects the remaining amount of paper.

  The recording paper 601 fed out by one sheet from the paper feeding unit 700 is sent to the paper transport unit 300 and is transported in the same manner as the recording paper 101 sent out from the paper feed tray 100 described above.

  Note that the XYZ coordinates in the figure are the X axis in the transport direction when the recording paper 101 passes through each toner image forming unit 430 and the Y axis in the rotation axis direction of the photosensitive drum 431. The Z axis is taken in the orthogonal direction. Further, when XYZ coordinates are shown in other drawings to be described later, the axial directions of these coordinates indicate a common direction. That is, the XYZ axes in each figure indicate the arrangement direction when the depicted portion of each figure constitutes the image forming apparatus 1000 shown in FIG.

  FIG. 2 is a schematic perspective view showing an essential structure of the inner frame 1 integrally formed with the inner side of the top cover 1001 and the LED head assembly 2 held by the inner frame 1, and FIG. 2 is a partially enlarged view of a holding mechanism portion (a portion in a circle indicated by an arrow M) in FIG. 2, and FIG. 4 is a schematic perspective view showing a configuration of a main part of the LED head assembly 2.

  The inner frame 1 is provided on the inner side of the top cover 1001 shown in FIG. 1 and is provided integrally therewith. The inner frame 1 is connected to the main body of the image forming apparatus 1000 (FIG. 1) by the pivotal fulcrum shafts 1a. It is pivotally supported so that it can be opened and closed. Accordingly, the top cover 1001 also opens and closes integrally with the inner frame 1, and here the inner frame 1 and the top cover 1001 function as an opening / closing lid of the image forming apparatus 1000 main body. Four LED head assemblies 2 for four colors of yellow (Y), magenta (M), cyan (C), and black (K) are arranged at regular intervals on the back surface of the inner frame 1 in order from the negative side of the X axis. Installed on.

  As described above, for each component of the image forming apparatus 1000, a portion excluding the component is referred to as an image forming apparatus main body.

  Next, the LED head assembly 2 will be described with reference to FIGS. Since these four LED head assemblies have the same configuration, the configuration will be described here by taking a black (K) LED head assembly as an example. When it is necessary to distinguish the four LED head assemblies 2, the corresponding colors (Y), (M), (C), and (K) are used to identify them by adding reference numerals 2a, 2b, 2c, and 2d. .

  The LED head assembly 2 includes an LED head 3, a head holder 4, a pair of compression coil springs 5, and a pair of earth springs 6. The earth spring 6 ensures electrical continuity between the LED head 3 and the main body of the image forming apparatus 1000 (FIG. 1). As shown in FIG. 4, the head holder 4 is coaxially integrated with a pair of rotation fulcrum portions 4a that are pivotally supported by the inner frame 1 (FIG. 2) and a rotation fulcrum portion 4a on the plus side of the Y axis. And a formed gear portion 4b. The gear portion 4b may be configured to be fixed to the head holder 4 as a separate component from the head holder 4. The LED head assembly 2 is pivotally supported on the inner frame 1 by the pair of rotation fulcrum portions 4a.

  As shown in FIG. 2, two idle gears 7 are mounted in the vicinity of the shaft support portion of each head holder 4 on the Y axis plus side of the inner frame 1, and one of the idle gears 7 is a gear portion 4 b of the head holder 4. Are engaged. A slide link 8 having a gear portion 8a that can mesh with each idle gear 7 is attached to the inner frame 1 so as to be slidable in the direction in which the LED head assembly 2 is disposed, and is reset by a reset spring 11 (FIG. 5). Is always urged in the direction of arrow A. As will be described later, when the inner frame 1 is closed, the slide link 8 is in contact with a stopper portion (not shown) of the inner frame 1 and is regulated in the direction of arrow A. At this time, It is comprised so that it may become the positional relationship spaced apart from the gear part 8a.

  Further, an idle gear 9 is attached to the inner frame 1 so that the inner frame 1 always meshes with a gear portion 8 b formed on the slide link 8. The sector gear 10 is fixed on the main body side of the image forming apparatus 1000 (FIG. 1) on the same axis as the rotation fulcrum shaft 1a of the inner frame 1, and the gear portion 10a is formed only within a predetermined range. The gear portion 10a is configured such that the mesh with the idle gear 9 is connected or disconnected depending on the opening / closing angle of the inner frame 1.

  As shown in FIG. 3, the inner frame 1 is provided with a stopper 1b for setting a rotation limit when the LED head assembly 2 rotates counterclockwise as viewed from the negative direction of the Y axis. . The contact portion 4c of the head holder 4 comes into contact with the stopper 1b, and the rotation of the LED head assembly 2 is restricted.

  The LED head assembly 2 corresponds to an exposure unit, the two idle gears and the gear portion 4b of the head holder 4 correspond to a rotation mechanism, and the sector gear 10, the idle gear 9, and the slide link 8 correspond to a drive mechanism. To do.

  In the above configuration, the operation of each part accompanying opening and closing of the top cover 1001 will be described below with reference to the operation explanatory diagrams of FIGS. 5 to 7, the image forming apparatus 1000 main body and the top cover 1001 are omitted to avoid complexity, and as a guide, a part of the outer shape of the inner frame 1 formed integrally with the top cover 1001 is omitted. Is indicated by a dotted line.

  FIG. 5 shows a state in which the inner frame 1 is closed. At this time, the four LED head assemblies 2a, 2b, 2c, and 2d are sandwiched between the four toner image forming units 430 attached to the main body of the image forming apparatus 1000 (FIG. 1) and the fixing unit 500, and the image is formed. It is stored inside the forming apparatus 1000 main body. At this time, the idle gear 9 is not meshed with the gear portion 10a of the sector gear 10, and the slide link 8 is further urged in the direction of the arrow A in the figure by the tension of the reset spring 11, and contacts the stopper portion (not shown). The four gear portions 8a are in contact with the idle gear 7 and disengaged.

  Accordingly, the head holder 4 can rotate around the rotation fulcrum 4a, but rotates because the positioning hole (not shown) of the LED head 3 is fitted with the positioning post (not shown) of the toner image forming unit 430. Without being fixed in this operating position. At this time, the inner surface 1c (FIG. 2) of the inner frame 1 is substantially horizontal, and the four LED head assemblies 2a, 2b, 2c, and 2d have the LED head 3 and the head holder 4 placed on the inner surface 1c. They are arranged along a substantially vertical direction. In other words, the side surface of each LED head assembly 2 is substantially perpendicular to the inner surface 1 c of the inner frame 1.

  FIG. 6 shows a state in which the opening angle of the inner frame 1 is opened at the opening angle θ1 (here, θ1 = 30 °). At this time, the idle gear 9 is engaged with the gear portion 10a of the sector gear 10. The gear portion 10a is formed to start the operation. Accordingly, since the driving force is not yet transmitted to the gear portion 8b of the slide link 8 in this state, the slide link 8 remains in contact with a stopper portion (not shown) due to the tension of the reset spring 11 in the arrow A direction. The gear portion 8a of the slide link 8 and each idle gear 7 are not meshed with each other.

At this time, each LED head assembly 2 is stationary at fixed angles ω1, ω2, ω3, and ω4 in the order closer to the rotation fulcrum shaft 1a of the inner frame 1 with respect to the direction orthogonal to the inner surface 1c of the inner frame 1. Yes. This is because each LED head assembly 2 needs to be guided between the toner image forming portions 430 at an optimum angle when the inner frame 1 is closed. The fixed angles ω <b> 1 to ω <b> 4 are determined at positions where the head holder 4 of the LED head assembly 2 that rotates by its own weight comes into contact with the stopper portion 1 b (FIG. 3) formed on the inner frame 1. By the way, the relationship between ω1 and ω4 is usually
ω1>ω2>ω3> ω4
In other words, the abutting position with the stopper portion 1b is determined so that the fixed angle of the LED head assembly 2 closer to the rotation fulcrum shaft 1a becomes larger. With this setting, the top cover 1001 can be opened and closed without causing each LED head assembly 2 to interfere with the toner image forming unit 430.

  FIG. 7 shows a state where the opening angle of the inner frame 1 is the opening angle θ2 (here, θ2 = 60 °) (= fully open state). It is assumed that the inner frame 1 is regulated so as not to rotate by an angle θ2 or more by a regulating member (not shown).

  From the state shown in FIG. 6, that is, the opening angle of the inner frame 1 opened to the opening angle θ1 (θ1 = 30 °), the idle gear 9 starts to mesh with the gear portion 10a of the sector gear 10 and is driven in the direction of arrow B. The slide link 8 slides in the direction of arrow C. As a result, the four gear portions 8a of the slide link 8 are sequentially meshed with the idle gears 7 to rotationally drive the gear portion 4b of the head holder 4, and the opening angle of the inner frame 1 is opened as shown in FIG. When the angle θ2 (here, θ2 = 60 °) is reached, the LED head assemblies 2a to 2d are displaced to the retracted positions rotated counterclockwise by ψ4 to ψ1, respectively.

Where
ψ1 = ω1 + 90 (°), ψ2 = ω2 + 90 (°)
ψ3 = ω3 + 90 (°), ψ4 = ω4 + 90 (°)
However, this is adjusted by setting the distance until each gear portion 8a of the slide link 8 meshes with each idle gear 7 . Therefore, the distance is longer as the gear portion is farther from the rotation fulcrum shaft 1a.

  As described above, when the inner frame 1 is opened at the angle θ2 (θ2 = 60 °) (= fully opened state), the LED head 3 and the head holder 4 of each LED head assembly 2 are connected to the inner surface 1c of the inner frame 1. The LED head assemblies 2 are rotated by the inner frame 1 so that the side surfaces of the LED head assemblies 2 are substantially parallel to the inner side surface 1c of the inner frame 1 so as to be arranged along a substantially parallel direction. Each rotation angle is considered in advance.

  In the conventional electrophotographic printer, for example, each LED head assembly 2 remains protruding below the inner frame 1 in the fully opened state shown in FIG. 7 in which the inner frame 1 is opened at an angle θ2 (θ2 = 60 °). Yes. For this reason, when the fixing unit 500 and the toner image forming unit 430 are taken out in the direction of arrow D in the figure, the LED head assembly 2 becomes an obstacle and the work is extremely difficult. However, the configuration of this embodiment is adopted. Thus, replacement of consumable units and jam removal can be easily performed without increasing the full opening angle.

  On the other hand, when the inner frame 1 is closed from the fully opened state, the flow is the reverse of each procedure for opening the inner frame 1 described above.

  That is, in FIG. 7, when the inner frame 1 starts to close, the idle gear 9 is driven in the direction opposite to the arrow B (clockwise), and the slide link 8 slides in the direction opposite to the arrow C (arrow A direction). Then, each idle gear 7 is driven by the gear portion 8a of the slide link 8, each LED head assembly 2 rotates clockwise, and the inner frame 1 eventually has an angle θ2 (θ2 = 30 °) as shown in FIG. Return until. At this time, the gear portion 8a of the slide link 8 and each idle gear 7 are all disengaged, and further, the engagement between the idle gear 9 and the gear portion 10a of the sector gear 10 is also disengaged. Accordingly, the slide link 8 comes into contact with a stopper portion (not shown) of the inner frame 1 while being urged in the direction of arrow A in the figure by the tension of the reset spring 11.

  Accordingly, since each idle gear 7 is disengaged from the gear portion 8a of the slide link 8 and becomes free, each LED head assembly 2 is rotated by its own weight and then the inner frame 1 is closed. The fully closed state shown in FIG.

  As described above, according to the image forming apparatus of the first embodiment, the LED head assembly is rotated and moved to the retracted position in accordance with the operation of opening the top cover. Even when the opening angle of the top cover is restricted due to the installation of a scanner or the like, replacement of the consumable unit and jam removal can be easily performed without being disturbed by the LED head assembly. Also, when the top cover is opened, the LED head light-emitting part moves away from the operator's work space when the consumable unit is replaced or when the jam is released due to the rotation of the LED head assembly. There is also an effect that the risk of damaging the light emitting portion of the LED head is reduced. Further, since the rotation of the LED head assembly is started when the opening angle of the top cover becomes equal to or larger than the predetermined opening angle, the rotation prevents the LED head assembly from colliding with the toner image forming portion or the like. be able to.

Embodiment 2. FIG.
FIG. 8 is a schematic perspective view showing the main configuration of the inner frame 1 employed in the image forming apparatus according to the second embodiment of the present invention and the LED head assembly 2 held by the inner frame.

  The image forming apparatus of the second embodiment is mainly different from the image forming apparatus 1000 (FIG. 1) of the first embodiment described above in that an idle gear that is rotatably held by the inner frame 1 in the first embodiment. 9 (FIG. 2), the point that the torque limiter 19 is adopted, and the opening angle of the inner frame 1 is regulated to 60 ° in the first embodiment, but in this embodiment, it can be opened up to 90 °. It is a point. Therefore, in the image forming apparatus employing the torque limiter 19, the same reference numerals are given to the parts common to the image forming apparatus 1000 (FIG. 1) of the first embodiment, or the drawings are omitted. The explanation is omitted, and different points are explained mainly.

  In FIG. 8, the torque limiter 19 has the same outer gear portion as the idle gear 9 (FIG. 2) described in the first embodiment, but is divided into two in the axial direction, and is arranged on the inner ring member side. It comprises a formed gear 19a and a gear 19b formed on the outer ring member side.

  FIG. 9 is a cross-sectional view of a main part of the torque limiter 19. The torque limiter 19 includes a gear 19a formed on the inner ring member side and a gear 19b formed on the outer ring member side, and is rotatably attached to a post 14 that is caulked on the inner frame 1 (FIG. 8). The E-ring 15 prevents it from coming off. The gear 19 a meshes with the gear portion 10 a of the sector gear 10, and the gear 19 b meshes with the gear portion 8 b of the slide link 8.

  The torque limiter 19 rotates together with the gear 19a and the gear 19b when the torque acting between the inner ring member and the outer ring member is smaller than a predetermined torque, and maintains a constant torque when the torque exceeds the predetermined torque. Has a mechanism for relative rotation. In the first embodiment, the opening angle of the inner frame 1 is regulated to 60 °. However, in this embodiment, the inner frame 1 can be opened up to 90 °, and the sliding link 8 has an opening angle of 60 °. At this stage (the state shown in FIG. 7), it is configured to abut against the stopper member 17 disposed on the inner frame 1 so that further movement in the C direction is restricted.

  The basic operation of the image forming apparatus according to the second embodiment is the same as that of the image forming apparatus according to the first embodiment. This will be described with reference to FIGS. 10 and 11. FIG. 7 is used in the description of the first embodiment. Here, it is assumed that a torque limiter 19 is used instead of the idle gear 9.

  FIG. 7 shows a state where the opening angle of the inner frame 1 is opened by the opening angle θ2 (θ2 = 60 °). From the state in which the inner frame 1 is closed (see FIG. 5) to the opening angle θ2 (θ2 = 60 °) in FIG. 7 through the state in which the opening angle θ1 (θ1 = 30 °) is reached (see FIG. 6). Since these operations are the same as those described in the first embodiment, a description thereof is omitted here.

  When the opening angle of the inner frame 1 is opened by the opening angle θ2 (θ2 = 60 °), the slide link 8 comes into contact with the stopper member 17 held by the inner frame 1 and can no longer move in the direction of arrow C. . Accordingly, when the inner frame 1 is further opened from this state (θ2 = 60 °), the torque generated between the gear 19a and the gear 19b of the torque limiter 19 becomes larger than a predetermined torque, so that the gear 19b of the torque limiter 19 is the gear 19a. Idling while maintaining a constant torque. In other words, the inner frame 1 is opened while the gear portion 8b of the slide link 8 and the gear 19b of the torque limiter 19 are kept in mesh, and eventually the angle θ3 (here, θ3 = 90 °) shown in FIG. State).

  Next, the operation when the inner frame 1 is closed from the fully opened state shown in FIG. 10 will be described.

  In the first embodiment described above, the meshing between the idle gear 9 (FIG. 7) and the sector gear 10 is such that the opening angle θ of the inner frame is between the opening angles θ1 (θ1 = 30 °) to θ2 (θ2 = 60 °). In the present embodiment, for example, when the inner frame 1 is opened to θ3 (θ3 = 90 °), the gear 19a of the torque limiter 19 and the gear portion 10a of the sector gear 10 are used. Is engaged in a range of 60 ° between θ1 (θ1 = 30 °) and θ3 (θ3 = 90 °).

  First, the opening angle of the inner frame 1 shifts from the state shown in FIG. 10 where the opening angle θ3 (θ3 = 90 °) is opened to the state where the opening angle θ2 (θ2 = 60 °) shown in FIG. In the process, the slide link 8 slides in the direction of arrow A in the figure, and the gear portion 8a of the slide link 8 drives each idle gear 7 to rotate each LED head assembly 2 in the clockwise direction. It will be in the state shown. At this time, the gear portion 8a of the slide link 8 and the idle gears 7 are all disengaged, and the slide link 8 is urged in the direction of arrow A in the figure by the tension of the reset spring 11, and a stopper portion (not shown) of the inner frame 1 is shown. It will be in the state which contacts. At this stage, each LED head assembly 2 is in a free state of rotation, and thereafter rotates by its own weight. That is, at this stage, each LED head assembly 2 is in a state in which the rotation is restricted by the contact portion 4c of the head holder 4 contacting the stopper 1b (FIG. 3) of the inner frame 1.

  Further, the opening angle of the inner frame 1 is changed from the state shown in FIG. 11 where the opening angle θ2 (θ2 = 60 °) is opened to the state where the opening angle θ1 (θ2 = 30 °) is further closed by 30 ° (see FIG. 6). Up to this point, the meshing of the gear 10a of the sector gear 10 and the gear 19a of the torque limiter 19 continues, but since the movement of the slide link 8 in the direction of arrow A is restricted, the gears 19a and 19b of the torque limiter 19 The torque generated between the torque 19 and the gear 19b of the torque limiter 19 rotates idly while maintaining a constant torque with the gear 19a. That is, during this time, the inner frame 1 is closed while the gear portion 8b of the slide link 8 and the gear 19b portion of the torque limiter 19 are maintained in meshing positions.

  Eventually, when the opening angle of the inner frame 1 reaches the opening angle θ1 (θ2 = 30 °) (see FIG. 6), the gear portion 8a of the slide link 8 and each idle gear 7 are disengaged. Until it is fully closed, the operation state is exactly the same as in the first embodiment. That is, each LED head assembly 2 returns to the fully closed state shown in FIG. 5 with the clockwise rotation being restricted during this time.

  As described above, according to the image forming apparatus of the present embodiment, the same effects as those of the first embodiment can be obtained, and further, a torque limiter is provided, so that the angle of the top cover fully opened is not limited. In this case, since the top cover can be made larger and opened to a desired position, the maintainability can be further improved.

Embodiment 3 FIG.
FIG. 12 is a schematic perspective view showing a main configuration of the LED head assembly 22 employed in the image forming apparatus according to the third embodiment of the present invention.

  The main difference between the image forming apparatus of the third embodiment and the image forming apparatus 1000 (FIG. 1) of the first embodiment is that the LED lens cleaning member 13 is detachably attached to the LED head assembly. is there. Accordingly, in the image forming apparatus employing the LED head assembly 22, the same reference numerals are given to the parts common to the image forming apparatus 1000 (FIG. 1) of the first embodiment described above, or the drawings are omitted. The explanation in is omitted, and different points are explained mainly.

  The LED head assembly 22 includes an LED head 3, a head holder 4, a pair of compression coil springs 5, and a pair of earth springs 6. The earth spring 6 ensures electrical continuity between the LED head 3 and the image forming apparatus main body (not shown). As shown in FIG. 12, the head holder 4 is coaxially integrated with a pair of rotation fulcrum portions 4a that are pivotally supported by the inner frame 1 (FIG. 2) and a plus rotation fulcrum portion 4a of the Y axis. And a formed gear portion 4b. The gear portion 4b may be configured to be fixed to the head holder 4 as a separate component from the head holder 4. The LED head assembly 22 is pivotally supported on the inner frame 1 by the pair of rotation fulcrum portions 4a.

  An LED lens cleaning member 13 is detachably attached to the head holder 4 above the head holder 4. The LED lens cleaning member 13 has a certain degree of elasticity and is formed of a flexible material that does not damage the lens surface of the LED head 3. In addition, it is desirable to have a suction force that does not disperse toner once adhered.

  Since the basic operation of the image forming apparatus according to the third embodiment is the same as that of the image forming apparatus according to the second embodiment, the operations different from those of the image forming apparatus according to the second embodiment will be described with reference to FIG. explain.

  FIG. 13 shows a state in which the opening angle of the inner frame 1 is opened by the opening angle θ2 (θ2 = 60 °). At this time, the side surface of each LED head assembly 22 is rotated to a position where it is substantially parallel to the inner surface 1 c of the inner frame 1, but when rotating, the lens surface of the LED head 3 is attached to the adjacent LED head assembly 22. It is configured to be wiped off (cleaned) by coming into contact with the LED lens cleaning member 13. Accordingly, the LED head 3 is subjected to a cleaning operation every time the operator opens and closes the inner frame 1 to the fully open state.

  Further, since the LED lens cleaning member 13 is detachably attached to the head holder 4, it can be cleaned and reused when it becomes dirty, and can be replaced when it becomes more dirty. Is possible.

  As described above, according to the image forming apparatus of the present embodiment, in addition to the same effects as those of the first embodiment, the surface of the LED head is cleaned in conjunction with the opening / closing operation of the top cover. Thus, it is possible to always obtain a good printing result without requiring a cleaning operation of the LED head surface. Further, when the top cover is fully opened, the light emitting surface of the LED head is covered with the LED head cleaning member of the adjacent LED head assembly, so that the light emitting surface of the LED head is damaged during replacement of consumables or during jam release operation. You can work without worry. Furthermore, since the LED head cleaning member has a removable structure, it can be cleaned and reused when it becomes dirty, so that the cost burden on the user can be reduced.

  In each of the above-described embodiments, the LED head is used as the exposure unit in the image forming apparatus such as an electrophotographic copying machine or an electrophotographic printer. However, the present invention is not limited to this. Instead, an exposure unit using a semiconductor laser may be used. Furthermore, in each of the above-described embodiments, the device in which the LED head assembly is attached to the top cover provided on the outside of the device main body has been described. However, the present invention is not limited to this, and the lid provided inside the outer housing. The present invention can also be applied to the case where the LED head assembly is attached to the body.

1 is a main part configuration diagram schematically showing a main part configuration of an image forming apparatus according to the present invention; BRIEF DESCRIPTION OF THE DRAWINGS It is a general | schematic perspective view which shows the principal part structure of the LED head assembly hold | maintained at the inner frame and inner frame of Embodiment 1 by this invention. FIG. 3 is a partial enlarged view of a holding mechanism portion (a portion in a circle indicated by an arrow M) in FIG. 2. FIG. 3 is a schematic perspective view showing a configuration of a main part of the LED head assembly in the first embodiment. FIG. 6 is an operation explanatory diagram for explaining an operation of each part associated with opening and closing of the top cover in the first embodiment. FIG. 6 is an operation explanatory diagram for explaining an operation of each part associated with opening and closing of the top cover in the first embodiment. FIG. 6 is an operation explanatory diagram for explaining an operation of each part associated with opening and closing of the top cover in the first embodiment. It is a general | schematic perspective view which shows the principal part structure of the LED head assembly hold | maintained at the inner frame of Embodiment 2 by this invention and an inner frame. FIG. 10 is a cross-sectional view of a main part of a torque limiter in the second embodiment. FIG. 11 is an operation explanatory diagram for explaining the operation of each part associated with opening and closing of the top cover in the second embodiment. FIG. 11 is an operation explanatory diagram for explaining the operation of each part associated with opening and closing of the top cover in the second embodiment. It is a general | schematic perspective view which shows the principal part structure of the LED head assembly employ | adopted as the image forming apparatus of Embodiment 3 based on this invention. FIG. 10 is an operation explanatory diagram for explaining the operation of each part associated with opening and closing of the top cover in the third embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner frame, 1a Rotation fulcrum shaft, 1b Stopper, 1c Inner surface, 2 LED head assembly, 3 LED head, 4 Head holder, 4a Rotation fulcrum part, 4b Gear part, 5 Compression coil spring, 6 Earth spring, 7 Idle Gear, 8 Slide link, 8a, 8b Gear part, 9 Idle gear, 10 Fan gear, 10a Gear part, 11 Reset spring, 14 Post, 15 E-ring, 17 Stopper member, 19 Torque limiter, 19a, 19b Gear, 22 LED Head assembly, 100 paper feed tray, 101 recording paper, 102 paper placement plate, 102a support shaft, 104 lift-up lever, 104a support shaft, 105 motor, 106 lift detection unit, 200 paper feed unit, 201 pickup roller, 202 Lead roller, 203 retard roller, 204 paper presence / absence detection unit, 205 paper remaining amount detection unit, 300 paper conveyance unit, 301 paper sensor, 302 conveyance roller pair, 303 paper sensor, 304 conveyance roller pair, 305 writing sensor, 400 image forming unit 430, toner image forming unit, 431 photosensitive drum, 432 charging roller, 434 developing roller, 460 transfer unit, 461 transfer belt, 462 drive roller, 463 tension roller, 464 transfer roller, 465 cleaning blade, 466 toner box, 500 fixing unit 501 Upper roller, 502 Lower roller, 503 Halogen lamp, 504 Discharge roller pair, 505 Stacker unit, 600 Manual feed tray, 601 Recording paper, 602 Paper placement plate, 602a Support shaft, 00 paper feeding unit, 701 the pickup roller, 702 a feed roller, 703 a retard roller, 1000 image forming apparatus, 1001 top cover.

Claims (13)

  1. An image forming apparatus provided with an opening / closing lid arranged to be rotatable with respect to the apparatus body,
    A plurality of exposure means rotatably supported on the inner side of the opening / closing lid so that the longitudinal direction thereof is substantially parallel to the rotation axis of the opening / closing lid, and the longitudinal direction as an axial direction;
    A plurality of rotation mechanisms for transmitting a rotation driving force to each of the exposure means;
    Drive each of the rotation mechanisms, rotate the exposure means in a direction from the operating position to the retracted position in conjunction with the opening operation of the opening / closing lid, and move the exposure means in conjunction with the closing operation of the opening / closing lid A drive mechanism that rotates in a direction from the retracted position toward the operating position,
    The driving mechanism starts driving the rotating mechanism after the opening angle reaches a predetermined opening angle when the opening / closing lid is opened.
    The plurality of rotation mechanisms and the drive mechanism are configured such that a rotation amount by which the exposure unit rotates by the drive mechanism when the opening / closing lid is opened / closed is that of the first and second exposure units of the plurality of exposure units. An image forming apparatus configured to be different from each other.
  2.   The plurality of rotation mechanisms and the drive mechanism are configured such that, when the opening / closing lid is opened, the exposure unit closest to the rotation axis among the plurality of exposure units does not collide with the apparatus main body by the rotation of the drive mechanism. The image forming apparatus according to claim 1, wherein the rotation of the exposure unit by the driving mechanism is started after the position is reached.
  3.   The plurality of rotation mechanisms and the drive mechanism are configured such that, when the opening / closing lid is opened, the exposure means rotate in a direction opposite to the direction of the rotation shaft, and the exposure means are in the retracted position. 3. The image forming apparatus according to claim 1, wherein a tip of each exposure unit is configured to face in a direction opposite to the rotation shaft.
  4.   4. The drive mechanism according to claim 1, wherein when the opening / closing lid is closed, the driving mechanism stops all the driving of the rotating mechanisms when the opening angle of the opening / closing lid reaches the predetermined opening angle. The image forming apparatus according to any one of the above.
  5.   The drive mechanism has a torque limiter, and the torque limiter operates to open an opening angle region where the exposure means is further opened while the opening / closing lid is opened, and the opening / closing lid is closed. 5. The image forming apparatus according to claim 1, further comprising an opening angle region that further closes the exposure unit while keeping the exposure unit in the operation position during operation.
  6.   The image forming apparatus according to claim 1, wherein the exposure unit includes an exposure unit and a support unit that supports the exposure unit.
  7.   When the exposure unit is in the operating position, the exposure unit and the support unit are arranged along a direction substantially perpendicular to the inner surface of the opening / closing lid, and when the exposure unit is in the retracted position, The image forming apparatus according to claim 6, wherein the support portion is arranged along a direction substantially parallel to an inner surface of the opening / closing lid.
  8.   The exposure means has a cleaning member, and when the exposure means is in the retracted position, the exposure part of the adjacent exposure means and the support part are in contact with each other and the exposure part of the support part is in contact with the exposure part. 8. The image forming apparatus according to claim 6, wherein a cleaning member is disposed on the image forming apparatus.
  9.   The image forming apparatus according to claim 6, wherein the exposure unit of the exposure unit is an LED head.
  10. An image forming apparatus provided with an opening / closing lid arranged to be rotatable with respect to the apparatus body,
    A plurality of LED head assemblies rotatably supported on the inner surface of the opening / closing lid so that the longitudinal direction thereof is substantially parallel to the rotation axis of the opening / closing lid and the longitudinal direction as an axial direction;
    A plurality of rotation mechanisms for transmitting a rotation driving force to each of the LED head assemblies;
    Each of the rotating mechanisms is driven, the LED head assembly is rotated in the direction from the operating position toward the retracted position in conjunction with the opening operation of the opening / closing lid, and the LED head assembly is interlocked with the closing operation of the opening / closing lid. And a drive mechanism that rotates in a direction from the retracted position to the operating position,
    The driving mechanism starts driving the rotating mechanism after the opening angle reaches a predetermined angle when the opening / closing lid is opened.
    The plurality of rotation mechanisms and the drive mechanism are configured such that a rotation amount by which the LED head assembly is rotated by the drive mechanism when the opening / closing lid is opened and closed is the first and second LEDs of the plurality of LED head assemblies. An image forming apparatus configured to be different from each other between head assemblies.
  11.   The image forming apparatus according to claim 10, wherein the LED head assembly includes an LED head and a head holder that holds the LED head.
  12. An image forming apparatus provided with an opening / closing lid arranged to be rotatable with respect to the apparatus body,
    A plurality of exposure means rotatably supported on the inner side of the opening / closing lid so that the longitudinal direction thereof is substantially parallel to the rotation axis of the opening / closing lid, and the longitudinal direction as an axial direction;
    A plurality of rotation mechanisms for transmitting a rotation driving force to each of the exposure means;
    Drive each of the rotation mechanisms, rotate the exposure means in a direction from the operating position to the retracted position in conjunction with the opening operation of the opening / closing lid, and move the exposure means in conjunction with the closing operation of the opening / closing lid A drive mechanism that rotates in a direction from the retracted position toward the operating position,
    The driving mechanism starts driving the rotating mechanism after the opening angle reaches a predetermined opening angle when the opening / closing lid is opened.
    The plurality of rotation mechanisms and the drive mechanism are configured such that, when the opening / closing lid is opened, the exposure means rotate in a direction opposite to the direction of the rotation shaft, and the exposure means are in the retracted position. The image forming apparatus is characterized in that the tip of each exposure means is configured to face in a direction opposite to the rotation axis.
  13. An image forming apparatus provided with an opening / closing lid arranged to be rotatable with respect to the apparatus body,
    A plurality of exposure means rotatably supported on the inner side of the opening / closing lid so that the longitudinal direction thereof is substantially parallel to the rotation axis of the opening / closing lid, and the longitudinal direction as an axial direction;
    A plurality of rotation mechanisms for transmitting a rotation driving force to each of the exposure means;
    Drive each of the rotation mechanisms, rotate the exposure means in a direction from the operating position to the retracted position in conjunction with the opening operation of the opening / closing lid, and move the exposure means in conjunction with the closing operation of the opening / closing lid A drive mechanism that rotates in a direction from the retracted position toward the operating position,
    The driving mechanism starts driving the rotating mechanism after the opening angle reaches a predetermined opening angle when the opening / closing lid is opened.
    The drive mechanism has a torque limiter, and the torque limiter operates to open an opening angle region where the exposure means is further opened while the opening / closing lid is opened, and the opening / closing lid is closed. An image forming apparatus comprising: an opening angle region that further closes the exposure unit while maintaining the exposure position at the operation position.
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