JP2009230053A - Image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming device reducing temperature elevation in the periphery of a developing device, by simple constitution. <P>SOLUTION: This image forming device is provided with an opening and closing plate 104 for opening and closing a cut-out part 102 of a casing 13 storing a developing device 64, and openedly and closedly moves the opening and closing plate 104, while interlocked with getting-in and -out operations of a paper sheet supply cassette 26. The paper sheet supply cassette 26 replenishes a sheet material P under the condition drawn out from a device body, when the sheet material P is consumed out, and the casing 13 is opened therein by the opening and closing plate 104. An opening 124 for a paper sheet conveying route is opened to an outside air, by drawing out the paper sheet supply cassette 26. Air flows therein into the casing 13, by openedly moving the opening and closing plate 104 and by opening the cut-out part 102 of the casing 13, An elevated temperature in the casing 13 is decreased by radiating heat to an outside of the device body. The temperature in the periphery of the developing device 64 stored in the casing 13 is reduced thereby, and continuous printing is allowed since the temperature does not reach a developer deterioration temperature. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image forming apparatus.

  As the image forming apparatus is further miniaturized, the temperature generated around the developing device continues to rise as long as there is no air circulation, and reaches the developer fixing temperature, leading to image quality defects and internal contamination due to developer spillage.

  As a workaround, a fan may be added (for example, Patent Documents 1 and 2) and air may be circulated around the developing device. However, it is difficult to completely cool the developer covered by the developing device. Further, when the temperature rises, the productivity decreases, but it is conceivable to stop the operation of the image forming apparatus and reduce the driving stress of the developing device. However, the temperature rise cannot be suppressed unless it is combined with a fan addition.

  Furthermore, it is possible to add a temperature sensor near the developing device and change the driving speed of the developing device depending on the temperature. However, the driving speed of the driving device must be controlled by a complex algorithm, and productivity is also improved. It will fall.

On the other hand, the temperature rise can be suppressed by always circulating the air around the developing device, but the dust causes color loss at the light-shielding part of the exposure device, shortens the life of the exposure device itself, and the developing device tends to condense. It is possible that the agent will deteriorate.
JP-A-5-27533 JP-A-6-161199

  An object of the present invention is to obtain an image forming apparatus that can reduce the temperature rise around the developing device with a simple configuration in consideration of the above facts.

  According to a first aspect of the present invention, in the image forming apparatus, a paper feed cassette that stores a recording medium on which an image is formed, an apparatus main body that accommodates the paper feed cassette in a removable manner, and the apparatus main body are disposed in the apparatus main body. A developing device for developing the latent image on the developer holding member, an opening / closing member that opens and closes the opening of the housing, and is interlocked with the loading / unloading operation of the paper feeding cassette. And first interlocking means for moving the opening and closing member to open and close the opening of the housing.

  According to a second aspect of the present invention, in the image forming apparatus according to the first aspect, the first interlocking unit includes a support portion provided at a free end of the opening / closing member, and one end portion of the support portion. A first interlocking member that moves the support portion in a direction in which the opening and closing member opens and closes the opening of the housing; a biasing unit that biases the first interlocking member in a direction in which the opening and closing member opens; A direction in which the opening / closing member closes the first interlocking member when it is provided in the sheet feeding cassette and hits the engaged portion provided at the other end of the first interlocking member when the sheet feeding cassette is inserted into the apparatus main body. When the sheet feeding cassette is pulled out from the apparatus main body, the engaging portion is separated from the engaged portion.

  According to a third aspect of the present invention, in the image forming apparatus, an opening / closing door provided in the apparatus main body so as to be openable / closable and opened / closed when a developer cartridge for supplying the developer to the developer accommodating portion is attached / detached; A developing device that is detachably arranged and develops a latent image on the developer holding member, an opening and closing member that is provided in a housing that houses the developing device, and that opens and closes an opening of the housing, Second interlocking means for moving the opening / closing member in conjunction with an opening / closing operation to open / close the opening of the housing.

  According to a fourth aspect of the present invention, in the image forming apparatus according to the third aspect, the second interlocking unit includes a support portion provided at a side end portion of a free end of the opening / closing member, and one end of the support portion. A second interlocking member that moves the support in a direction in which the opening and closing member opens and closes the opening of the housing, and the other door of the second interlocking member hits, A cam surface that moves the second interlocking member in a direction in which the opening and closing member opens when the opening and closing door is opened, and moves the second interlocking member in a direction in which the opening and closing member closes when the opening and closing door is closed. Consists of.

  According to a fifth aspect of the present invention, in the image forming apparatus according to the first or second aspect, the blower disposed in the apparatus main body is driven by detecting that the paper feed cassette is pulled out from the apparatus main body. Let

  According to a sixth aspect of the present invention, in the image forming apparatus according to the first or second aspect, the feeding of a blower disposed in the apparatus main body is detected by detecting that the paper feed cassette is pulled out from the apparatus main body. Increase air volume.

  According to a seventh aspect of the present invention, in the image forming apparatus according to any one of the first to fourth aspects, when the opening / closing member is in an open state, the blowout is performed from a blower outlet of a blower disposed in the apparatus main body. The blown air hits the opening / closing member and is sent into the housing.

  According to an eighth aspect of the present invention, in the image forming apparatus according to any one of the first to seventh aspects, at least two opening / closing members are provided.

  According to the first aspect of the present invention, the inside of the housing can be opened by pulling out the paper feed cassette, and the temperature around the developing device accommodated in the housing can be lowered.

  According to the second aspect of the present invention, the first interlocking member can be moved in the direction in which the opening / closing member opens and closes the opening of the housing by the loading / unloading of the paper feed cassette.

  According to the third aspect of the present invention, the inside of the housing can be opened by opening the open / close door, and the temperature around the developing device accommodated in the housing can be lowered.

  According to the fourth aspect of the present invention, the second interlocking member can be moved in a direction in which the opening and closing member opens and closes the opening of the housing by opening and closing the opening and closing door.

  According to the fifth aspect of the present invention, even if the paper feed cassette is pulled out when the blower is not driven, the blower is driven by pulling out the paper feed cassette, so that the temperature around the developing device is lowered by the blower. be able to.

  According to the sixth aspect of the present invention, the air per unit time sent or discharged from the blower can be made larger than the state in which the normal blower is driven, and the temperature around the developing device is positively increased. Can be lowered.

  According to the seventh aspect of the present invention, the outside air can be sent around the developing device housed in the housing, and the temperature of the air around the developing device can be actively lowered.

  According to the eighth aspect of the present invention, the heat dissipation effect can be enhanced and the temperature of the air around the developing device can be lowered as compared with the case where there is only one opening / closing member.

An image forming apparatus provided with a developing device according to an embodiment of the present invention will be described.
(Image forming device)
First, the image forming apparatus will be described. As shown in FIG. 1, in the image forming apparatus 10, process cartridges 14 of four colors (yellow, magenta, cyan, and black in this embodiment) are arranged in the vertical direction and can be attached to and detached from the housing 13. Is housed in.

  The process cartridge 14 includes a photosensitive member cartridge 62 having a photosensitive member 16 as an image holding member, and a developing device 64 (details will be described later). The photosensitive member cartridge 62 includes the photosensitive member 16 and a photosensitive member. The charging roll 18, the erase lamp 22, and the cleaning device 24 are arranged around the body 16.

  In addition, a sheet feeding cassette 26 in which the sheet material P is stored is provided in the lower part of the image forming apparatus 10, and a pickup roll 28 that feeds the sheet material P at a predetermined timing is provided in the vicinity of the sheet feeding cassette 26. Is provided. The sheet material P sent out from the paper feed cassette 26 by the pickup roll 28 is sent out to the paper transport path 34 via the registration roll 32 and transported to a transport device 48 described later.

  On the other hand, the process cartridge 14 is arranged in the order of yellow, magenta, cyan, and black from the upstream side of the paper transport path 34. Scanning light is applied to the process cartridge 14 on the side of the process cartridge 14. An exposure device 36 for irradiating is disposed.

  In the exposure device 36, a semiconductor laser (not shown), a polygon mirror 40, an imaging lens 44, and a mirror 46 are disposed in a housing 38, and light from the semiconductor laser is deflected and scanned by the polygon mirror 40. The photosensitive member 16 is irradiated through the imaging lens 44 and the mirror 46. Thereby, an electrostatic latent image corresponding to the image information is formed on the photosensitive member 16.

  Here, a fan (blower) 65 is disposed above the image forming apparatus 10, and blows outside air into the apparatus main body 11 to cool the exposure device 36, the process cartridge 14, and the like. .

  On the other hand, a transport device 48 is disposed at a position facing the photoconductor 16 across the paper transport path 34. The conveying device 48 includes a pair of stretching rolls 51 and 52 provided along the side wall 10 </ b> A of the image forming apparatus 10, and a conveying belt 53 wound around the stretching rolls 51 and 52. The tension roll 52 is rotated by a motor (not shown) so that the transport belt 53 moves.

  A transfer roll 54 is disposed on the back surface of the transport belt 53 at a position facing the photoconductor 16 of each color. A toner image, which will be described later, on the photoreceptor 16 is transferred onto the sheet material P conveyed by the conveying belt 53 by the transfer roll 54 and fixed by the fixing device 56. Then, the sheet material P on which the toner image is fixed is discharged to the discharge tray 60 by the discharge roll 58.

Further, a sheet conveyance path 61 for conveying the sheet material P from the discharge roll 58 to the registration roll 32 is provided on the side wall 10A side of the image forming apparatus 10, and the sheet material on which the toner image is fixed by the fixing device 56 is provided. Images are formed on both sides of the sheet material P by conveying P to the sheet conveyance path 34 again by the sheet conveyance path 61.
(Developer)
Next, the developing device according to this embodiment will be described.

  As shown in FIGS. 1 and 2, the developing device 64 is a developing unit that faces the photoreceptor 16 and visualizes the electrostatic latent image on the photoreceptor 16 with a two-component developer composed of toner and a magnetic carrier. 68, and a toner replenishing section 70 for replenishing toner in a toner cartridge (not shown) to the developing unit 68.

  The developing unit 68 includes a housing 80. The housing 80 is provided below the photoconductor 16, and an opening 82 that opens toward the photoconductor 16 is formed. A developing roll 86 as a developer holder is provided in the housing 80 so as to be partially exposed from the opening 82 and is rotatably supported by the housing 80.

  A gear (not shown) is fixed to the end of the developing roll 86, and the rotational force from the motor is transmitted to the gear so that the developing roll 86 is rotated via the gear. The developing roll 86 is provided with a thin cylindrical sleeve 86A having conductivity, which can be rotated, and a fixed columnar magnet roll 86B.

  Opposite to the sleeve 86A of the developing roll 86, a cylindrical developer regulating roll 87 is fixed with a gap between the sleeve 86A and regulates the amount of developer on the developing roll 86. As a result, the developing roll 86 adsorbs the magnetic carrier contained in the developer by magnetic force, forms a magnetic brush of the developer on the surface, the amount of the developer is regulated by the developer regulating roll 87, and the developer Is conveyed to a position facing the photoconductor 16. Then, the electrostatic latent image formed on the photoconductor 16 is visualized as a toner image by the developer on the developing roll 86.

  In addition, a paddle wheel 100 as a supply member is provided below the developing roll 86 and is rotatably supported by the housing 80. In the paddle wheel 100, four plate-like paddles 100B are provided along the axial direction of the rotating shaft 100A every 90 ° along the circumferential direction of the rotating shaft 100A. A gear (not shown) is fixed to the end of the rotating shaft 100A, and a rotational force from a motor (not shown) is transmitted to the gear, and the paddle wheel 100 rotates through the gear.

  A developer storage chamber 96 is provided in the back of the paddle wheel 100 (opposite the opening 82), and stirring transport augers 88 and 89 for stirring and transporting the developer are disposed in the developer storage chamber 96. It is installed. The agitating / conveying augers 88 and 89 include rotation shafts 88A and 89A, respectively, and are rotatably supported on the peripheral wall of the housing 80, respectively. Further, spiral blades 88B and 89B are spirally wound around the rotation shafts 88A and 89A of the agitation transport augers 88 and 89 at a predetermined pitch.

  Further, gears (not shown) are fixed to the end portions of the rotary shafts 88A and 89A, respectively, and a rotational force from a motor (not shown) is transmitted to the gears, and the agitating and transporting augers 88 and 89 rotate through the gears. .

  A partition wall 90 is formed between the agitating / conveying auger 88 and the agitating / conveying auger 89, and the partition wall 90 allows a region (first agitating path) in which the agitating / conveying auger 88 is disposed in the developer storage chamber 96. ) 92 and a region (second agitation path) 93 in which the agitating / conveying auger 89 is disposed.

  At both ends in the longitudinal direction of the partition wall 90, communication ports (not shown) are formed. The first agitating path 92 and the second agitating path 93 are connected by this communication port, and the toner replenished from the toner replenishing unit 70 is replenished to the first agitating path 92 and then the agitating and conveying augers 88 and 89 are connected. The first agitating path 92 and the second agitating path 93 are respectively agitated and conveyed by rotation, and are circulated between the first agitating path 92 and the second agitating path 93. The developer stirred and conveyed in the developer storage chamber 96 is supplied to the developing roll 86 via the paddle wheel 100.

  Next, the operation of the image forming apparatus 10 according to the present embodiment will be described.

  As shown in FIG. 1, the charging roll 18 to which a voltage is applied first negatively charges the surface of the photoconductor 16 uniformly with a predetermined charging portion potential. Exposure is performed by the exposure device 36 so that the image portion on the charged photoreceptor 16 has a predetermined exposure portion potential, and an electrostatic latent image is formed.

  That is, a latent image corresponding to an image is formed on the photoconductor 16 by turning on and off a semiconductor laser (not shown) based on image data supplied from a control device (not shown).

  Further, as shown in FIG. 2, the developer agitated and conveyed by the agitating / conveying auger 89 is adsorbed to the sleeve 86A of the developing roll 86 of the developing device 64 by the magnetic force of the magnet roll 86B. Further, the developer adsorbed on the sleeve 86A passes through the gap S between the developer regulating roll 87 and the developing roll 86, so that the surplus portion is worn away, and the developer layer thickness becomes uniform.

  A predetermined developing bias voltage is applied to the developing roller 86 for each color from a power supply device (not shown), and the electrostatic latent image on the photosensitive member 16 is static when passing through the position of the developing roller 86. The developer toner adheres to the electrostatic latent image by electric force and is visualized as a toner image.

  On the other hand, as shown in FIG. 1, the sheet material P placed in the paper feed cassette 26 is sent to the paper transport path 34 by the pickup roll 28, transported at a predetermined timing by the registration roll 32, and photosensitive. The toner image is transferred to the sheet material P through the space between the body 16 and the transfer roll 54. The transferred toner image is fixed by the fixing device 56, and the sheet material P on which the toner image is fixed is discharged to the discharge tray 60 by the discharge roll 58.

  In the case of duplex printing, the sheet material P on which the toner image has been fixed by the fixing device 56 is not discharged onto the discharge tray 60 but is discharged in a state where the rear end portion of the sheet material P is held by the discharge roll 58. While the roll 58 is reversed, the conveyance path of the sheet material P is switched to the double-sided paper conveyance path 61, and the front and back of the sheet material P are reversed by the conveyance roll 63 disposed in the paper conveyance path 61. Then, the sheet is conveyed again to the sheet conveyance path 34. Then, after the toner image is transferred to the back surface of the sheet material P, the toner image is fixed by the fixing device 56, and the sheet material P is discharged to the discharge tray 60 by the discharge roll 58.

Here, the main part of the developing device according to the present embodiment will be described.
(First embodiment)
First, the first embodiment will be described.

  As shown in FIG. 3, the image forming apparatus 10 is provided with a casing 13 that accommodates the process cartridge 14. The upper wall 13 </ b> A of the casing 13 is located on the opening side of the casing 13. A notch (opening) 102 is formed in a U-shape. The notch 102 is covered with a long plate-like opening / closing plate (opening / closing member) 104.

  The rear wall 102A of the notch 102 is provided with a shaft support portion 106 that supports the opening / closing plate 104 so as to be rotatable within a predetermined angle. The opening / closing plate 104 can be opened and closed around the shaft support portion 106. By opening and closing the plate 104, the notch 102 of the housing 13 is opened and closed.

  One end of a guide pin 108 extending along the longitudinal direction of the opening / closing plate 104 is fixed to one end of the free end of the opening / closing plate 104. The other end of the guide pin 108 is supported by a concave support 112 provided at the upper end of a bar-like interlocking member 110 extending in the height direction of the housing 13 in the vicinity of the side wall 13B of the housing 13. ing.

  A coil spring 114 is disposed at the lower end portion of the interlocking member 110 and urges the interlocking member 110 upward. Further, a bent portion 116 is provided from the lower end portion of the interlocking member 110 so as to be bent at a right angle toward the housing 13 and then to extend in parallel with the housing 13.

  An inclined surface 118 is formed at the tip of the bent portion 116, and the lower surface is longer than the upper surface of the bent portion 116. On the other hand, a contact portion 120 is provided on the side wall of the paper feed cassette 26 along the direction in which the paper feed cassette 26 enters and exits. An end surface of the abutting portion 120 located in the back of the accommodating portion 27 of the sheet feeding cassette 26 is an inclined surface 122 that can face the inclined surface 118 and can be brought into surface contact with each other.

  In a state where the paper feed cassette 26 is stored in the apparatus main body 11 (see FIG. 1) of the image forming apparatus 10, as shown in FIG. The inclined surface 122 hits the inclined surface 118 of the bent portion 116 provided on the interlocking member 110 and presses the coil spring 114 in a direction against the urging force via the inclined surface 118. As a result, the interlocking member 110 moves downward, the guide pin 108 moves downward, and the opening / closing plate 104 closes the notch 102 of the housing 13.

  On the other hand, when the paper feed cassette 26 is pulled out from the apparatus main body 11, the inclined surface 122 of the contact portion 120 moves away from the inclined surface 118 of the interlocking member 110 as shown in FIG. Thereby, the interlocking member 110 moves upward by the urging force of the coil spring 114, the guide pin 108 is lifted upward, and the opening / closing plate 104 opens the notch 102 of the housing 13.

  That is, the opening / closing plate 104 can be moved in conjunction with the loading / unloading operation of the paper feed cassette 26 to open / close the notch 102 of the housing 13. When the sheet material P runs out of the sheet material P, the sheet material P is replenished with the sheet material P being pulled out from the apparatus main body 11.

  In the paper feed cassette 26 and the apparatus main body 11, at least the paper transport path 34 has an opening 124, so that the opening 124 is opened to the outside by pulling out the paper feed cassette 26. At this time, by opening and closing the opening / closing plate 104 and opening the notch 102 of the housing 13, air can flow into the housing 13 as shown in FIG. The temperature can be released out of the apparatus main body 11. Accordingly, the temperature around the developing device 64 accommodated in the housing 13 can be lowered, and printing can be continuously performed without reaching the developer deterioration temperature.

  Here, a fan 65 is disposed on the upper portion of the image forming apparatus 10, and blows outside air into the apparatus main body 11 to cool the exposure apparatus 36, the process cartridge 14, and the like. By opening the plate 104, the wind of the fan 65 strikes the opening / closing plate 104, and the wind of the fan 65 is guided into the housing 13 along the opening / closing plate 104.

  Accordingly, the wind of the fan 65 moves from the upper part to the lower part of the housing 13 and moves through the opening 124 provided between the sheet cassette 26 and the fan 65. That is, outside air can be actively sent around the developing device 64 accommodated in the housing 13, and the temperature of the air around the developing device 64 can be lowered efficiently.

  Further, the fan 65 may discharge air from the inside of the apparatus main body 11 to the outside. Further, while the image forming apparatus 10 is on standby in a so-called power saving mode, the fan 65 is not driven. Even in such a case, the fan 65 is driven by detecting that the paper feed cassette 26 has been pulled out. You may be allowed to do so. Further, the unit that the fan 65 sends out or discharges by detecting that the paper feed cassette 26 has been pulled out, and making the rotational speed of the fan 65 faster than when the normal fan 65 is driven, etc. You may increase the air per hour.

Further, since the opening / closing plate 104 is provided on the exposure device 36 side of the housing 13, the temperature of the exposure device 36 can be efficiently lowered by sending outside air into the housing 13 through the opening / closing plate 104.
(Second Embodiment)
Next, the second embodiment will be described, but the description of the contents that are substantially the same as those of the first embodiment will be omitted.

  As shown in FIG. 6, an opening / closing cover 126 is provided on the side wall of the apparatus main body 11 of the image forming apparatus 10. The side wall 13B of the casing 13 in which the process cartridge 14 is accommodated is provided with a mounting portion 15 having a rectangular tube shape, and can swing in the horizontal direction with respect to the side wall 13B while the back wall side is supported. It is said that. A toner cartridge 128 that supplies toner to the developing device 64 is detachable from the mounting portion 15, and the opening / closing cover 126 is opened and closed when the toner cartridge 128 is replaced.

  A fan-shaped cam member 130 is provided in a lower portion of the side end portion of the opening / closing cover 126 in a plan view. The cam member 130 is disposed so as to lean against the opening / closing cover 126, and is gradually separated from the opening / closing cover 126 as it goes from the upper part to the lower part of the cam member 130 with its angle held by the holding member 131. Yes.

  On the other hand, the guide pin 108 of the opening / closing plate 104 is supported by the interlocking member 132, and the lower end portion of the interlocking member 132 contacts the cam member 130. Here, as shown in FIG. 7 and FIG. 8B (note that FIG. 7A and FIG. 8A are side sectional views, and FIG. 7B and FIG. 8B are plan views) The opening / closing cover 126 has a rotation center portion P on the inner side of the side end portion of the opening / closing cover 126.

  Accordingly, when the opening / closing cover 126 is rotated around the rotation center portion P, the distance between the side end portions of the interlocking member 110 and the opening / closing cover 126 changes, and when the opening / closing cover 126 is opened, the interlocking member 110 and the opening / closing cover are changed. The separation distance from the side end portion 126 becomes smaller. For this reason, as shown in FIGS. 9A and 9B, the position of the cam member 130 on which the interlocking member 110 abuts moves from the lower portion to the upper portion of the cam member 130.

  That is, as shown in FIGS. 7A and 7B, when the open / close cover 126 is closed, the cam member 130 that is in contact with the interlocking member 110 is positioned below the cam member 130. . Therefore, the interlocking member 132 is disposed below, the guide pin 108 is lowered, and the opening / closing plate 104 closes the notch 102 of the housing 13.

  On the other hand, as shown in FIGS. 8A and 8B, when the opening / closing cover 126 is opened, the position of the cam member 130 against which the interlocking member 110 abuts moves from the lower part to the upper part of the cam member 130 and interlocks. The member 132 moves upward. For this reason, the guide pin 108 is lifted upward, and the opening / closing plate 104 opens the notch 102 of the housing 13.

  In this way, the opening / closing plate 104 can be opened and closed in conjunction with the opening / closing operation of the opening / closing cover 126. When the toner in the toner cartridge 128 runs out, the opening / closing cover 126 is opened and the toner cartridge 128 is replaced. At this time, the housing 13 is opened by the opening / closing plate 104.

  Here, the open / close plate 104 provided on the upper wall 13A of the housing 13 is opened in conjunction with the opening / closing operation of the open / close cover 126. The side wall 13B may be opened and closed. In this case, the side wall 13B and the opening / closing cover 126 may be connected to open / close the side wall 13B in conjunction with the opening / closing operation of the opening / closing cover 126.

  Further, the opening / closing plate 104 provided in the housing 13 only needs to be able to be opened / closed in conjunction with the loading / unloading operation of the paper feed cassette 26 or the opening / closing operation of the opening / closing cover 126, and is not limited to these embodiments. For example, a wire or the like may be connected to the paper feed cassette 26 or the opening / closing cover 126, and the opening / closing plate 104 may be opened and closed by connecting the wire and the opening / closing plate 104.

  Furthermore, the present invention is not limited to the above-described embodiment, and various modifications, changes, and improvements can be made without departing from the gist of the present invention.

1 is an overall configuration diagram of an image forming apparatus according to an exemplary embodiment. 1 is a schematic configuration diagram illustrating a developing device of an image forming apparatus according to an exemplary embodiment. 1 is a schematic perspective view showing the inside of an image forming apparatus according to a first embodiment. FIG. 1A is a schematic side cross-sectional view illustrating a state where an image forming apparatus according to a first embodiment is inserted, and FIG. It is a schematic sectional side view which shows. It is explanatory drawing which shows the effect | action of the image forming apparatus which concerns on 1st Embodiment. It is a schematic perspective view which shows the image forming apparatus which concerns on 2nd Embodiment. FIG. 5A is a schematic sectional side view and FIG. 5B is a schematic plan view showing a state in which an opening / closing cover of an image forming apparatus according to a second embodiment is closed. FIG. 5A is a schematic side sectional view showing a state in which an opening / closing cover of an image forming apparatus according to a second embodiment is opened, and FIG. The main part of the image forming apparatus according to the second embodiment will be described. (A) is a perspective view showing a state in which the opening / closing cover is closed, and (B) is a perspective view showing a state in which the opening / closing cover is opened. .

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 11 Apparatus main body 13 Case 26 Paper feed cassette 64 Developing device 65 Fan (blower)
68 Development Unit (Development Device)
102 Notch (opening)
104 Opening and closing plate (opening and closing member)
108 Guide pins (support, first interlocking means, second interlocking means)
110 interlocking member (first interlocking member, first interlocking means)
114 Coil spring (biasing means, first interlocking means)
118 inclined surface (engaged part, first interlocking means)
122 Inclined surface (engagement part, first interlocking means)
126 Open / close cover (open / close door)
130 Cam member (cam surface, second interlocking means)
132 interlocking member (second interlocking means)

Claims (8)

A paper feed cassette for storing a recording medium on which an image is formed;
An apparatus main body for accommodating the paper feed cassette in a removable manner;
A developing device disposed in the apparatus main body for developing a latent image on the developer holder;
An opening / closing member provided in a housing for accommodating the developing device, for opening and closing an opening of the housing;
First interlocking means for opening and closing the opening of the housing by moving the opening and closing member in conjunction with the loading and unloading operation of the paper feed cassette;
An image forming apparatus. The first interlocking means is
A support portion provided at a free end of the opening and closing member;
A first interlocking member that moves the support part in a direction in which one end hits the support part and the opening and closing member opens and closes the opening of the housing;
Biasing means for biasing the first interlocking member in a direction in which the opening and closing member is opened;
When the sheet feeding cassette is provided in the sheet feeding cassette and is inserted into the apparatus main body, the opening / closing member closes the first interlocking member against an engaged portion provided at the other end of the first interlocking member. Moving in the direction, and pulling out the paper feed cassette from the apparatus main body, an engaging portion that is separated from the engaged portion;
The image forming apparatus according to claim 1, comprising: An opening / closing door provided in the apparatus main body so as to be openable and closable, which opens and closes when a developer cartridge for supplying the developer to the developer container is attached or detached;
A developing device that is detachably disposed in the apparatus main body and that develops a latent image on the developer holder;
An opening / closing member provided in a housing for accommodating the developing device, for opening and closing an opening of the housing;
Second interlocking means for moving the opening and closing member in conjunction with the opening and closing operation of the opening and closing door to open and close the opening of the housing;
An image forming apparatus. The second interlocking means is
A support portion provided at a side end portion of the free end of the opening and closing member;
A second interlocking member that moves the support part in a direction in which one end hits the support part and the opening and closing member opens and closes the opening of the housing;
When the other end of the second interlocking member hits and opens the opening / closing door, the second interlocking member is moved in the opening direction, and the opening / closing door is closed. A cam surface that moves the second interlocking member in a direction in which the member closes;
The image forming apparatus according to claim 3, comprising:   3. The image forming apparatus according to claim 1, wherein when the sheet feeding cassette is pulled out from the apparatus main body, the blower disposed in the apparatus main body is driven.   3. The image forming apparatus according to claim 1, wherein when the sheet feeding cassette is pulled out from the apparatus main body, the air blowing amount of a blower disposed in the apparatus main body is increased.   The image according to any one of claims 1 to 4, wherein air blown from a blower outlet of a blower disposed in the apparatus main body hits the open / close member and is sent into the housing in the open state of the open / close member. Forming equipment.   The image forming apparatus according to claim 1, wherein at least two opening / closing members are provided.

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