JP2021026200A - Image forming device - Google Patents

Abstract

To provide an embodiment of an image forming device.SOLUTION: An image forming device comprises a developer container having an inlet port and a discharge port, and a shutter having a through-hole and a shutting part. The shutter is configured to pass through a third position where the through-hole overlaps the discharge port while turning from a first position where the through-hole overlaps the inlet port to a second position where the shutting part shuts the inlet port.SELECTED DRAWING: Figure 44

Description

The present invention relates to an image forming apparatus that forms an image on a recording material.

Generally, an electrophotographic image forming apparatus forms an image by transferring a toner image formed on the surface of a photosensitive drum to a transfer material as a transfer medium. As the developer replenishment method, for example, a process cartridge method and a toner replenishment method are known. The process cartridge method is a method in which a photosensitive drum and a developing container are integrated as a process cartridge, and when the developer runs out, the process cartridge is replaced with a new one.

On the other hand, the toner replenishment method is a method of replenishing the developing container with new toner when the toner runs out. Conventionally, a toner replenishment type one-component developing device has been proposed in which a toner supply box capable of replenishing toner is connected to a toner transfer path through which toner is conveyed (see Patent Document 1). The toner stored in the toner supply box is conveyed to the toner transfer path by the transfer screw.

Japanese Unexamined Patent Publication No. 08-30804

In recent years, users have requested various ways of using an image forming apparatus, such as the above-mentioned process cartridge method and toner replenishment method.

Therefore, an object of the present invention is to provide a form of an image forming apparatus.

The first aspect of the present invention is an image forming apparatus that is a toner container that stores toner and has a supply port for supplying toner, and has a through hole and a shielding portion, and has a rotation axis. A shutter rotatably configured around the center and a toner accommodating portion configured so that the toner container can be mounted so that toner from the toner container can be received when viewed in the direction of the rotation axis. Has an inlet provided at a position overlapping the supply port and a discharge port provided at a position not overlapping with the supply port, and accommodates toner dropped from the inlet and the discharge port. The shutter has a toner accommodating portion, and the shutter has a through hole with the receiving port so that the toner of the toner container is supplied to the toner accommodating portion when viewed in the direction of the rotation axis. The shielding portion is configured to rotate between a first position that overlaps and a second position that overlaps the receiving port so that the toner in the toner container is not supplied to the toner accommodating portion. The shutter is characterized in that, while rotating from the first position to the second position, the through hole passes through a third position where the through hole overlaps with the discharge port when viewed in the direction of the rotation axis. ..

According to the present invention, one form of an image forming apparatus can be provided.

(A) is a sectional view showing an image forming apparatus according to the first embodiment, and (b) is a perspective view showing an image forming apparatus. (A) is a cross-sectional view showing an image forming apparatus, and (b) is a perspective view showing an image forming apparatus with a top cover opened. FIG. 2 is a cross-sectional view showing an image forming apparatus with the process cartridge removed. (A) is a perspective view showing an image forming device in a state where the pressure plate of the reading device is closed, (b) is a perspective view showing an image forming device in a state where the pressure plate is opened, and (c) is a perspective view showing the image forming device in a state where the pressure plate is opened. The perspective view which shows the image forming apparatus in a state of being (A) is a perspective view showing a developing container and a toner pouch, and (b) is a front view showing a developing container and a toner pouch. (A) is a sectional view taken along the line 6A-6A of FIG. 5B, and FIG. 5B is a sectional view taken along the line 6B-6B of FIG. 5B. The perspective view which shows the toner pouch. (A) is a front view showing a toner pouch, (b) is a front view showing a first modification of the toner pouch, and (c) is a front view showing a second modification of the toner pouch. The cross-sectional view which shows the 1st and 2nd toner residual quantity sensors. The circuit diagram which shows the 1st and 2nd toner remaining amount sensors. (A) is a cross-sectional view showing a developing container with a small amount of toner remaining, and (b) is a sectional view showing a developing container with a large amount of toner remaining. The block diagram which shows the control system of an image forming apparatus. A flowchart showing a toner replenishment process. A flowchart showing a toner remaining amount detection process. The perspective view which shows the operation part. (A) is a cross-sectional view showing a state in which the toner pouch is attached to the supply port, (b) is a cross-sectional view showing a state in which toner begins to leak from the toner pouch, and (c) is a cross-sectional view showing a state in which all the toner in the toner pouch is developed. A cross-sectional view showing a state in which the container is replenished. (A) is a perspective view showing a toner remaining amount panel when the toner remaining amount is Low level, (b) is a perspective view showing a toner remaining amount panel when the toner remaining amount is Mid level, and (c) is a toner remaining amount. The perspective view which shows the toner remaining amount panel when the amount is a full level. (A) is a graph showing the relationship between the volume of the developing container and the toner remaining amount level, (b) is a graph showing the toner remaining amount when toner is replenished from a small capacity toner pouch, and (c) is a large capacity. A graph showing the remaining amount of toner when toner is replenished from the toner pouch. (A) is a perspective view showing a first modification of the image forming apparatus, (b) is a perspective view showing a second modification of the image forming apparatus, and (c) is a perspective view showing a third modification of the image forming apparatus. .. (A) is a perspective view showing a fourth modified example of the image forming apparatus, and (b) is a perspective view showing a fifth modified example of the image forming apparatus. (A) is a perspective view showing an image forming apparatus according to a second embodiment, and (b) is a sectional view showing an image forming apparatus. (A) is a perspective view showing a modified example of the image forming apparatus of the second embodiment, and (b) is a cross-sectional view showing a modified example of the image forming apparatus of the second embodiment. (A) is a cross-sectional view showing an image forming apparatus according to a third embodiment, and (b) is a sectional view showing an image forming apparatus in a state where the process cartridge is pulled out. A cross-sectional view showing a state in which a toner pouch is attached to a process cartridge in a pulled-out state. (A) is a perspective view showing an image forming apparatus in a state where the process cartridge is pulled out, and (b) is a perspective view showing a state in which a toner pouch is attached to the process cartridge in the pulled out state. Perspective view showing the entire toner pouch Perspective view showing disassembled parts that make up the toner pouch Perspective view showing disassembled parts that make up the toner pouch Perspective view showing a state in which the second sheet is fixed to the second shutter. Replenishment base perspective and cross section Sectional view of toner pouch Perspective view showing the connection state of the supply base and the pouch (A) is a perspective view showing a state in which the toner supply opening of the toner pouch is closed, and (b) is a perspective view showing a state in which the toner supply opening of the toner pouch is opened. Perspective view of the supply port of the developing container A perspective view showing the replenishment port of the developing container and peripheral parts disassembled. A perspective view showing the replenishment port of the developing container and peripheral parts disassembled. Cross-sectional view of the replenishment port of the developing container and peripheral parts Perspective view showing the positional relationship between the shutter cover and the first seal A perspective view showing a state in which the supply port is closed and the toner pouch is fitted. Schematic cross-sectional view showing a state in which the toner pouch is mounted on the developing container. A perspective view showing the two-way shaft portion of the developing container and its peripheral shape. Perspective view showing another embodiment of the downstream opening Cross-sectional view showing a state in which the toner pouch and the developing container are combined. Schematic cross-sectional view showing a state in which the toner pouch is mounted on the developing container. Perspective view showing another embodiment of the joint between the toner pouch pouch and the replenishment base 501.

Hereinafter, exemplary embodiments for carrying out the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 1A is a schematic view showing the configuration of the image forming apparatus 1 according to the first embodiment. The image forming apparatus 1 is a monochrome printer that forms an image on a recording material based on image information input from an external device. Recording materials include papers such as plain paper and cardboard, plastic films such as sheets for overhead projectors, specially shaped sheets such as envelopes and index papers, and various sheet materials of different materials such as cloth.

[overall structure]
As shown in FIGS. 1A and 1B, the image forming apparatus 1 is mounted on the printer main body 100 as the apparatus main body, the reading device 200 supported to be opened and closed by the printer main body 100, and the exterior surface of the printer main body 100. It has an attached operation unit 300 and. The printer main body 100 uses the image forming unit 10 that forms a toner image on the recording material, the feeding unit 60 that feeds the recording material to the image forming unit 10, and the toner image formed by the image forming unit 10 as the recording material. It has a fixing portion 70 for fixing and a discharge roller pair 80.

The image forming unit 10 includes a scanner unit 11, an electrophotographic process cartridge 20, and a transfer roller 12 that transfers a toner image formed on the photosensitive drum 21 of the process cartridge 20 to a recording material. As shown in FIGS. 6A and 6B, the process cartridge 20 includes a photosensitive drum 21, a charging roller 22 arranged around the photosensitive drum 21, a pre-exposure device 23, and a developing device 30 including a developing roller 31. Have.

The photosensitive drum 21 is a photosensitive member formed into a cylindrical shape. The photosensitive drum 21 of the present embodiment has a photosensitive layer formed of a negatively charged organic photosensitive member on a drum-shaped substrate formed of aluminum. Further, the photosensitive drum 21 as the image carrier is rotationally driven by a motor in a predetermined direction (clockwise in the figure) at a predetermined process speed.

The charging roller 22 comes into contact with the photosensitive drum 21 with a predetermined pressure contact force to form a charged portion. Further, by applying a desired charging voltage with a charged high-voltage power supply, the surface of the photosensitive drum 21 is uniformly charged to a predetermined potential. In the present embodiment, the photosensitive drum 21 is negatively charged by the charging roller 22. The pre-exposure device 23 removes static electricity from the surface potential of the photosensitive drum 21 before it penetrates the charged portion in order to generate a stable discharge in the charged portion.

The scanner unit 11 as an exposure means scans and exposes the surface of the photosensitive drum 21 by irradiating the photosensitive drum 21 with a laser beam corresponding to image information input from an external device or a reading device 200 using a polygon mirror. To do. By this exposure, an electrostatic latent image corresponding to the image information is formed on the surface of the photosensitive drum 21. The scanner unit 11 is not limited to the laser scanner device, and for example, an LED exposure device having an LED array in which a plurality of LEDs are arranged along the longitudinal direction of the photosensitive drum 21 may be adopted.

The developing device 30 includes a developing roller 31 as a developing agent carrier that supports the developing agent, a developing container 32 that serves as a frame of the developing device 30, and a supply roller 33 that can supply the developing agent to the developing roller 31. I have. The developing roller 31 and the supply roller 33 are rotatably supported by the developing container 32. Further, the developing roller 31 is arranged in the opening of the developing container 32 so as to face the photosensitive drum 21. The supply roller 33 is rotatably in contact with the developing roller 31, and the toner as a developer contained in the developing container 32 is applied to the surface of the developing roller 31 by the supply roller 33. The supply roller 33 is not always required as long as the toner can be sufficiently supplied to the developing roller 31.

The developing apparatus 30 of this embodiment uses a contact developing method as a developing method. That is, the toner layer supported on the developing roller 31 comes into contact with the photosensitive drum 21 in the developing portion (developing region) where the photosensitive drum 21 and the developing roller 31 face each other. A developing voltage is applied to the developing roller 31 by a developing high-voltage power source. Under the developing voltage, the toner carried on the developing roller 31 is transferred from the developing roller 31 to the drum surface according to the potential distribution on the surface of the photosensitive drum 21, so that the electrostatic latent image is developed into a toner image. In this embodiment, the reverse development method is adopted. That is, a toner image is formed by adhering toner to the surface region of the photosensitive drum 21 in which the amount of electric charge is attenuated by being charged in the charging step and then being exposed in the exposure step.

Further, in the present embodiment, a toner having a particle size of 6 μm and a normal charging polarity of negative electrode is used. As an example, the toner of the present embodiment uses a polymerized toner produced by a polymerization method. Further, the toner of the present embodiment is a so-called non-magnetic one-component developer in which the toner does not contain a magnetic component and the toner is supported on the developing roller 31 mainly by an intermolecular force or an electrostatic force (mirror image force). However, a one-component developer containing a magnetic component may be used. In addition to the toner particles, the one-component developer may contain additives (for example, wax or silica fine particles) for adjusting the fluidity and charging performance of the toner. Further, as the developing agent, a two-component developing agent composed of a non-magnetic toner and a magnetic carrier may be used. When a magnetic developer is used, for example, a cylindrical developing sleeve in which a magnet is arranged inside is used as the developer carrier.

Inside the developing container 32, a stirring member 34 as a stirring means is provided. The stirring member 34 is driven by the motor M1 (see FIG. 12) to rotate to stir the toner in the developing container 32 and feed the toner toward the developing roller 31 and the supply roller 33. Further, the stirring member 34 has a role of circulating the toner stripped from the developing roller 31 which is not used for development in the developing container and homogenizing the toner in the developing container. The stirring member 34 is not limited to the rotating form. For example, a stirring member in a swinging form may be adopted.

Further, a developing blade 35 that regulates the amount of toner carried on the developing roller 31 is arranged in the opening of the developing container 32 in which the developing roller 31 is arranged. The toner supplied to the surface of the developing roller 31 passes through the portion facing the developing blade 35 as the developing roller 31 rotates, so that the toner is uniformly thinned and charged negatively by triboelectric charging. ..

As shown in FIGS. 1A and 1B, the feeding unit 60 includes a front door 61 that is openably and closably supported by the printer body 100, a tray unit 62, a middle plate 63, a tray spring 64, and a pickup roller. It has 65 and. The tray portion 62 constitutes the bottom surface of the recording material accommodating space that appears when the front door 61 is opened, and the middle plate 63 is supported by the tray portion 62 so as to be able to move up and down. The tray spring 64 urges the middle plate 63 upward, and presses the recording material P loaded on the middle plate 63 against the pickup roller 65. The front door 61 closes the recording material accommodating space in a state of being closed with respect to the printer main body 100, and supports the recording material P together with the tray portion 62 and the middle plate 63 in a state of being open with respect to the printer main body 100. To do.

The fixing unit 70 is of a heat fixing method in which an image fixing process is performed by heating and melting the toner on the recording material. The fixing portion 70 includes a fixing film 71, a fixing heater such as a ceramic heater for heating the fixing film 71, a thermistor for measuring the temperature of the fixing heater, and a pressure roller 72 for pressing contact with the fixing film 71.

Next, the image forming operation of the image forming apparatus 1 will be described. When a command for image formation is input to the image forming device 1, the image forming process by the image forming unit 10 is started based on the image information input from the external computer connected to the image forming device 1 or the reading device 200. Will be done. The scanner unit 11 irradiates the photosensitive drum 21 with a laser beam based on the input image information. At this time, the photosensitive drum 21 is precharged by the charging roller 22, and the electrostatic latent image is formed on the photosensitive drum 21 by being irradiated with the laser beam. After that, the electrostatic latent image is developed by the developing roller 31, and a toner image is formed on the photosensitive drum 21.

In parallel with the image forming process described above, the pickup roller 65 of the feeding section 60 feeds out the recording material P supported by the front door 61, the tray section 62, and the middle plate 63. The recording material P is fed to the registration roller pair 15 by the pickup roller 65, and the skew is corrected by hitting the nip of the registration roller pair 15. Then, the registration roller pair 15 is driven in accordance with the transfer timing of the toner image, and conveys the recording material P toward the transfer nip formed by the transfer roller 12 and the photosensitive drum 21.

A transfer voltage is applied to the transfer roller 12 as the transfer means from the transfer high-voltage power source, and the toner image carried on the photosensitive drum 21 is transferred to the recording material P conveyed by the registration roller pair 15. The recording material P to which the toner image is transferred is conveyed to the fixing portion 70, and the toner image is heated and pressurized when passing through the nip portion between the fixing film 71 of the fixing portion 70 and the pressure roller 72. .. As a result, the toner particles are melted and then fixed, so that the toner image is fixed to the recording material P. The recording material P that has passed through the fixing portion 70 is discharged to the outside (outside the machine) of the image forming apparatus 1 by the discharge roller pair 80 as the discharge means, and the discharge tray 81 as the loading part formed on the upper portion of the printer main body 100. It is loaded on.

The discharge tray 81 is inclined upward toward the downstream in the discharge direction of the recording material, and the recording material discharged to the discharge tray 81 slides down the discharge tray 81 so that the rear end thereof is aligned with the regulation surface 84. To.

As shown in FIGS. 4A and 4B, the reading device 200 includes a reading unit 201 having a reading unit (not shown) inside, and a pressure plate 202 that is openably and closably supported by the reading unit 201. ing. On the upper surface of the reading unit 201, a platen glass 203 on which a document is placed is provided while transmitting light emitted from the reading unit.

When the image of the original is read by the reading device 200, the user places the original on the platen glass 203 with the pressure plate 202 open. Then, by closing the pressure plate 202, the position shift of the document on the platen glass 203 is prevented, and for example, by operating the operation unit 300, a reading command is output to the image forming apparatus 1. When the reading operation is started, the reading unit reciprocates in the sub-scanning direction, that is, in the left-right direction with the operation unit 300 of the image forming apparatus 1 facing the front. The reading unit emits light from the light emitting unit to the document, receives the light reflected by the document by the light receiving unit, and performs photoelectric conversion to read the image of the document. In the following, the front-rear direction, the left-right direction, and the up-down direction are defined with reference to the state in which the operation unit 300 faces the front.

As shown in FIGS. 2B and 3, a first opening 101 opened upward is formed in the upper part of the printer main body 100, and the first opening 101 is covered with a top cover 82. There is. The top cover 82 as a loading tray is supported so as to be openable and closable with respect to the printer main body 100 about a rotation shaft 82c extending in the left-right direction, and a discharge tray 81 as a loading surface is formed on the upper surface. The top cover 82 is opened from the front side to the back side with the reading device 200 opened with respect to the printer main body 100. The reading device 200 and the top cover 82 may be configured to be held in an open state and a closed state by a holding mechanism such as a hinge mechanism.

For example, when the recording material is jammed due to a paper jam or the like in the transport path CP through which the recording material fed by the pickup roller 65 passes, the user opens the top cover 82 together with the reading device 200. Then, the user accesses the process cartridge 20 from the first opening 101 exposed by opening the top cover 82, and pulls out the process cartridge 20 along the cartridge guide 102. The cartridge guide 102 slides and guides the protruding portion 21a (see FIG. 5A) provided at the axial end of the photosensitive drum 21 of the process cartridge 20.

Then, by pulling out the process cartridge 20 from the first opening 101 to the outside, a space is created in which the transport path CP can be accessed. The user can process the jammed recording material by reaching the inside of the printer main body 100 through the first opening 101 and accessing the recording material jammed by the transport path CP.

Further, in the present embodiment, as shown in FIGS. 1B and 4C, the opening / closing member 83 is provided on the top cover 82 so as to be openable / closable. The discharge tray 81 of the top cover 82 is formed with a second opening 82a as an opening that opens upward. The opening / closing member 83 is between a closed position that covers the replenishment port 32a so that the toner pouch 40 cannot be attached to the developing container 32 and an open position that exposes the replenishment port 32a so that the toner pouch 40 can be attached to the developing container 32. Is configured to be movable. The opening / closing member 83 functions as a part of the discharge tray 81 in the closed position. The opening / closing member 83 and the second opening 82a are formed on the left side of the discharge tray 81. Further, the opening / closing member 83 is supported by the top cover 82 so as to be openable / closable around a rotation shaft 83a extending in the front-rear direction, and is opened to the left by hooking a finger from the groove 82b provided in the top cover 82. .. The opening / closing member 83 is formed in a substantially L shape along the shape of the top cover 82.

The second opening 82a of the discharge tray 81 is opened so that the toner replenishment replenishment port 32a formed in the upper part of the developing container 32 is exposed, and the opening / closing member 83 is opened so that the user can use the top cover. The supply port 32a can be accessed without opening the 82. In the present embodiment, a method of supplying toner from the toner pouch 40 (FIGS. 1A and 1B) as a toner container to the developing apparatus 30 while the developing apparatus 30 is attached to the image forming apparatus 1. (Direct replenishment method) is adopted. Therefore, when the remaining amount of toner in the process cartridge 20 becomes low, it is not necessary to take out the process cartridge 20 from the printer main body 100 and replace it with a new process cartridge, so that usability can be improved. In addition, toner can be replenished to the developing container 32 at a lower cost than replacing the entire process cartridge 20. In the direct replenishment method, it is not necessary to replace various rollers, gears, and the like as compared with the case where only the developing device 30 of the process cartridge 20 is replaced, so that the cost can be reduced. The image forming apparatus 1 and the toner pouch 40 constitute an image forming system.

[Recovery of transfer residual toner]
The present embodiment employs a cleanerless configuration in which the transfer residual toner remaining on the photosensitive drum 21 without being transferred to the recording material P is collected by the developing device 30 and reused. The transfer residual toner is removed in the following steps. The transfer residual toner includes toners that are positively charged and toners that are negatively charged but do not have sufficient charge. The photosensitive drum 21 after transfer is statically charged by the pre-exposure device 23 to generate a uniform discharge by the charging roller 22, so that the transfer residual toner is charged negatively again. The transfer residual toner, which is charged negatively again in the charged portion, reaches the developing portion as the photosensitive drum 21 rotates. Then, the surface region of the photosensitive drum 21 that has passed through the charged portion is exposed by the scanner unit 11 with the transfer residual toner adhering to the surface, and an electrostatic latent image is written.

Here, the behavior of the transfer residual toner that has reached the developing portion will be described separately for the exposed portion and the non-exposed portion of the photosensitive drum 21. The transfer residual toner adhering to the non-exposed portion of the photosensitive drum 21 is transferred to the developing roller 31 by the potential difference between the potential (dark portion potential) of the non-exposed portion of the photosensitive drum 21 and the developing voltage in the developing portion, and is transferred to the developing roller 31. Will be collected. This is because the development voltage applied to the developing roller 31 is positive relative to the potential of the non-exposed portion, assuming that the normal charging polarity of the toner is negative. The toner collected in the developing container 32 is agitated and dispersed with the toner in the developing container by the stirring member 34, and is supported on the developing roller 31 to be used again in the developing step.

On the other hand, the transfer residual toner adhering to the exposed portion of the photosensitive drum 21 remains on the drum surface without being transferred from the photosensitive drum 21 to the developing roller 31 in the developing portion. This is because the development voltage applied to the developing roller 31 is a negative electrode potential even more than the potential of the exposed portion (bright region potential), assuming that the normal charging polarity of the toner is negative. .. The transfer residual toner remaining on the drum surface is supported on the photosensitive drum 21 together with other toner transferred from the developing roller 31 to the exposed portion, moves to the transfer portion, and is transferred to the recording material S in the transfer portion.

As described above, in the present embodiment, the transfer residual toner is collected in the developing device 30 and reused in a cleanerless configuration, but the transfer residual toner is collected by using a cleaning blade that comes into contact with the conventionally known photosensitive drum 21. It may be configured to be used. In that case, the transfer residual toner collected by the cleaning blade is collected in a collection container installed separately from the developing device 30. However, the cleaner-less configuration eliminates the need for an installation space for a collection container for collecting transfer residual toner and the like, which enables further miniaturization of the image forming apparatus 1 and reuses transfer residual toner. This makes it possible to reduce the printing cost.

[Structure of developing container and toner pouch]
Next, the configurations of the developing container 32 and the toner pouch 40 will be described. FIG. 5A is a perspective view showing the developing container 32 and the toner pouch 40, and FIG. 5B is a front view showing the developing container 32 and the toner pouch 40. 6 (a) is a sectional view taken along the line 6A-6A of FIG. 5 (b), and FIG. 6 (b) is a sectional view taken along the line 6B-6B of FIG. 5 (b).

As shown in FIGS. 5A to 6B, the developing container 32 has a transport chamber 36 for accommodating the stirring member 34, and the transport chamber 36 as an accommodating portion for accommodating the toner is developed. It extends over the entire length of the container 32 in the longitudinal direction (left-right direction). In addition, the transport chamber 36 rotatably supports the developing roller 31 and the supply roller 33, and houses a developing agent for being supported on the developing roller 31. Further, the developing container 32 protrudes upward from one end of the transport chamber 36 in the longitudinal direction and communicates with the transport chamber 36 from the first protruding portion 37 and the other end of the transport chamber 36 in the longitudinal direction. It has a second protruding portion 38 that protrudes toward the surface. That is, the first protruding portion 37 is provided at one end of the developing container 32 in the direction of the rotation axis of the developing roller 31, and faces the discharge tray 81 in the intersecting direction intersecting the rotation axis direction from the central portion of the developing container 32. Is protruding. The second protruding portion 38 is provided at the other end of the developing container 32 in the direction of the rotation axis of the developing roller 31, and projects toward the discharge tray 81 in the intersecting direction from the central portion of the developing container 32. In the present embodiment, the first protruding portion 37 is formed on the left side of the developing container 32, and the second protruding portion 38 is formed on the right side of the developing container 32. A mounting portion 57 to which the toner pouch 40 can be mounted is provided on the upper end portion (tip portion) of the first protruding portion 37, and the developing agent is supplied from the toner pouch 40 to the transport chamber 36 in the mounting portion 57. A supply port 32a for the purpose is formed. The toner pouch 40 can be mounted on the mounting portion 57 in a state of being exposed to the outside of the device.

The first protruding portion 37 and the second protruding portion 38 extend obliquely from the transport chamber 36 toward the front of the device and upward. That is, the first protruding portion 37 and the second protruding portion 38 project downstream and upward in the discharge direction of the discharge roller pair 80. Therefore, the replenishment port 32a formed in the first protrusion 37 is arranged on the front side of the image forming apparatus 1, and the toner replenishment work to the developing container 32 can be easily performed.

In particular, in the present embodiment, since the reading device 200 that can be opened and closed centering on the back side of the device is arranged above the opening / closing member 83, it is better to arrange the supply port 32a in front of the device as the supply port 32a. The space between the reader 200 and the reader 200 can be effectively used. Therefore, workability when replenishing toner from the replenishment port 32a can be improved.

The upper portion of the first protruding portion 37 and the upper portion of the second protruding portion 38 are connected by a handle portion 39 as a connecting portion. A space through which the laser L (see FIG. 1 (a)) emitted from the scanner unit 11 (see FIG. 1 (a)) toward the photosensitive drum 21 can pass between the handle portion 39 and the transport chamber 36. Laser passage space SP is formed.

The handle portion 39 has a grip portion 39a that can be gripped by a user by hooking a finger, and the grip portion 39a is formed so as to project upward from the top surface of the handle portion 39. The inside of the first protruding portion 37 is formed to be hollow, and the supply port 32a is formed on the upper surface thereof. The supply port 32a is configured to be connectable to the toner pouch 40.

By providing the first protruding portion 37 having the supply port 32a formed at the tip portion on one side in the longitudinal direction of the developing container 32, a laser passing space SP through which the laser L emitted from the scanner unit 11 can pass is secured. The image forming apparatus 1 can be miniaturized. Further, since the second protruding portion 38 is provided on the other side in the longitudinal direction of the developing container 32 and the handle portion 39 connecting the first protruding portion 37 and the second protruding portion 38 is formed, the process cartridge 20 is mounted from the printer main body 100. Usability when taking out can be improved. The second protruding portion 38 may be formed in a hollow shape like the first protruding portion 37, or may have a solid shape.

The toner pouch 40 is configured to be removable from the mounting portion 57 of the first protruding portion 37. Further, the toner pouch 40 is formed corresponding to a second shutter 41 provided in the opening and openable and closable, and a plurality of (three in the present embodiment) groove 32b formed in the mounting portion 57 (three in the present embodiment). In this embodiment, it has three) protrusions 42. When replenishing the developing container 32 with toner, the user aligns the protrusion 42 of the toner pouch 40 so as to pass through the groove 32b of the mounting portion 57, and connects the toner pouch 40 to the mounting portion 57. Then, when the toner pouch 40 is rotated 180 degrees in this state, the second shutter 41 of the toner pouch 40 abuts on the abutting portion (not shown) of the mounting portion 57, so that the toner pouch 40 rotates with respect to the main body of the toner pouch 40. 2 The shutter 41 is opened. As a result, the toner contained in the toner pouch 40 leaks from the toner pouch 40, and the leaked toner enters the hollow first protruding portion 37 through the supply port 32a. The second shutter 41 may be provided on the supply port 32a side.

The first protruding portion 37 has a slope 37a at a position facing the opening of the supply port 32a, and the slope 37a is inclined downward toward the transport chamber 36. Therefore, the toner replenished from the replenishment port 32a is guided to the transport chamber 36 by the slope 37a. Further, the stirring member 34 has a stirring shaft 34a extending in the longitudinal direction and a blade portion 34b extending radially outward from the stirring shaft 34a.

The toner supplied from the supply port 32a arranged on the upstream side in the transport direction of the stirring member 34 is sent toward the developing roller 31 and the supply roller 33 as the stirring member 34 rotates. The transport direction of the stirring member 34 is a direction parallel to the longitudinal direction of the developing container 32. The replenishment port 32a and the first protruding portion 37 are arranged at one end in the longitudinal direction of the developing container 32, and the toner is distributed over the entire length of the developing container 32 by repeating the rotation of the stirring member 34. In the present embodiment, the stirring member 34 is composed of the stirring shaft 34a and the blade portion 34b, but the spiral stirring shaft is configured to spread the toner over the entire length of the developing container 32. May be used.

In the present embodiment, the toner pouch 40 is composed of a easily deformable plastic bag body as shown in FIGS. 7 and 8 (a), but is not limited thereto. For example, the toner pouch may be composed of a substantially conical bottle container 40B as shown in FIG. 8 (b), or may be composed of a paper container 40C made of paper as shown in FIG. 8 (c). .. In any case, the toner pouch may be made of any material and shape. Further, as a method of discharging toner from the toner pouch, it is preferable that the user squeezes the toner pouch 40 or the paper container 40C with a finger, and the bottle container 40B allows the user to hit the container. It is preferable to leak while vibrating. Further, in order to discharge the toner from the bottle container 40B, a discharge mechanism may be provided in the bottle container 40B. Further, the ejection mechanism may be configured to engage with the printer main body 100 and receive a driving force from the printer main body 100.

Further, the second shutter 41 may be omitted in any toner pouch, and a sliding shutter may be applied instead of the rotary second shutter 41. Further, the second shutter 41 may be destroyed by attaching the toner pouch to the supply port 32a or rotating the toner pouch in the attached state, and even if it has a removable lid structure such as a seal. Good.

[How to detect the remaining amount of toner]
Next, a method of detecting the remaining amount of toner in the developing container 32 will be described with reference to FIGS. 9 to 11. The developing apparatus 30 of the present embodiment is provided with a first toner remaining amount sensor 51 and a second toner remaining amount sensor 52 that detect a state according to the remaining amount of toner in the developing container 32.

The first toner remaining amount sensor 51 has a light emitting unit 51a and a light receiving unit 51b, and the second toner remaining amount sensor 52 has a light emitting unit 52a and a light receiving unit 52b. FIG. 10 is a circuit diagram showing an example of the circuit configuration of the toner remaining amount sensors 51 and 52. In the following description, the circuit configuration of the first toner remaining amount sensor 51 will be described, and the description of the circuit configuration of the second toner remaining amount sensor 52 will be omitted.

In FIG. 10, an LED is used for the light emitting unit 51a, and a phototransistor that is turned on by the light from the LED is used for the light receiving unit 51b, but the present invention is not limited to this. For example, a halogen lamp or a fluorescent lamp may be applied to the light emitting unit 51a, or a photodiode or an avalanche photodiode may be applied to the light receiving unit 51b. A switch (not shown) is provided between the light emitting unit 51a and the power supply voltage Vcc, and by turning on the switch, the voltage from the power supply voltage Vcc is applied to the light emitting unit 51a, and the light emitting unit 51a It becomes a conductive state. On the other hand, the light receiving unit 51b is also provided with a switch (not shown) between the light receiving unit 51b and the power supply voltage Vcc, and when the switch is turned on, the light receiving unit 51b is brought into a conductive state by a current corresponding to the detected light amount.

A power supply voltage Vcc and a current limiting resistor R1 are connected to the light emitting unit 51a, and the light emitting unit 51a emits light by a current determined by the current limiting resistor R1. The light emitted from the light emitting unit 51a passes through the optical path Q1 as shown in FIG. 9 and is received by the light receiving unit 51b. A power supply voltage Vcc is connected to the collector terminal of the light receiving unit 51b, and a detection resistor R2 is connected to the emitter terminal. The light receiving unit 51b, which is a phototransistor, receives the light emitted from the light emitting unit 51a and outputs a signal (current) according to the amount of the received light. This signal is converted into a voltage V1 by the detection resistor R2 and input to the A / D conversion unit 95 of the control unit 90 (see FIG. 12). The light receiving unit 52b of the second toner remaining amount sensor 52 receives the light emitted from the light emitting unit 52a and passing through the optical path Q2, and the voltage V2 is output according to the amount of the received light, and the A / D of the control unit 90. It is input to the conversion unit 95.

The control unit 90 (CPU 91) determines whether or not the light receiving units 51b and 52b have received light from the light emitting units 51a and 51b based on the input voltage level. The control unit 90 (CPU 91) develops the toner in the developing container 32 based on the length of time when the light receiving units 51b and 52b detect each light and the received light intensity when the toner in the developing container 32 is agitated by the stirring member 34 for a certain period of time. The amount of toner in the container 32 is calculated. That is, the ROM 93 stores in advance a table capable of outputting the remaining amount of toner from the light receiving time and the light intensity when the toner is conveyed by the stirring member 34, and the control unit 90 inputs the toner to the A / D conversion unit 95. And the table, and predict / calculate the remaining amount of toner.

More specifically, the optical path Q1 of the first toner remaining amount sensor 51 is set so as to intersect the rotation locus T of the stirring member 34. The time during which the optical path Q1 is shielded by the toner bounced up by the stirring member 34 when the stirring member 34 makes one rotation, that is, the time during which the light receiving unit 51b does not detect the light from the light emitting unit 51a depends on the remaining amount of toner. And change. Further, the light receiving intensity at the light receiving unit 51b also changes depending on the remaining amount of toner.

That is, when the remaining amount of toner is large, the optical path Q1 is easily blocked by the toner, so that the time during which the light receiving unit 51b receives light is shortened, and the light receiving intensity of the light received by the light receiving unit 51b is reduced. On the other hand, when the remaining amount of toner is low, on the contrary, the time during which the light receiving unit 51b receives light becomes longer, and the light receiving intensity of the light received by the light receiving unit 51b becomes stronger. Therefore, the control unit 90 can determine whether the remaining amount of toner is the Low level or the Mid level, as will be described later, based on the light receiving time and the light receiving intensity of the light receiving unit 51b. For example, as shown in FIG. 11A, when the amount of toner in the transport chamber 36 of the developing container 32 is very small, it is determined that the remaining amount of toner is at the Low level. In the above description, the second toner remaining amount sensor 52 is arranged so as not to intersect the rotation locus T of the stirring member 34, but the rotation of the stirring member 34 is similar to the above-mentioned first toner remaining amount sensor 51. It may be arranged so as to intersect the locus T.

Further, the optical path Q2 of the second toner remaining amount sensor 52 is set above the rotation locus T so as not to intersect the rotation locus T of the stirring member 34. Then, the light receiving unit 52b of the second toner remaining amount sensor 52 does not detect the light from the light emitting unit 52a when the optical path Q2 is shielded by the toner, and the light receiving unit 52b from the light emitting unit 52a when the optical path Q2 is not shielded by the toner. Detect light. Therefore, the control unit 90 determines whether or not the remaining amount of toner is at the Full level, as will be described later, based on whether or not the light receiving unit 52b receives light regardless of the rotational operation of the stirring member 34. For example, as shown in FIG. 11B, when the amount of toner in the transport chamber 36 of the developing container 32 is large, it is determined that the remaining amount of toner is at the Full level. In the above description, the second toner remaining amount sensor 52 is arranged so as not to intersect the rotation locus T of the stirring member 34, but the rotation of the stirring member 34 is similar to the above-mentioned first toner remaining amount sensor 51. It may be set to intersect the locus T.

The method for detecting / estimating the remaining amount of toner is not limited to the method for detecting the remaining amount of optical toner described in FIG. 9, and various well-known methods for detecting / estimating the remaining amount of toner can be adopted. .. For example, two or more metal plates or conductive resin sheets extending in the longitudinal direction of the developing roller are arranged on the inner wall of the developing container 32 which is a frame, and the capacitance between the two metal plates or the conductive resin sheets is measured. Then, the remaining amount of toner may be detected / estimated. Alternatively, a load cell is provided so as to support the developing device 30 from below, and the CPU 51 calculates the remaining amount of toner by subtracting the weight of the developing device 30 when the toner is empty from the weight measured by the load cell. You may do so. Further, the first toner remaining amount sensor 51 may be omitted, and the control unit 90 (CPU 91) may calculate the toner remaining amount from the detection result of the second toner remaining amount sensor 52 and the light emission status of the laser beam. ..

[Control system of image forming apparatus]
FIG. 12 is a block diagram showing a control system of the image forming apparatus 1. The control unit 90 as a control means of the image forming apparatus 1 has a CPU 91 as an arithmetic unit, a RAM 92 used as a work area of the CPU 91, and a ROM 93 for storing various programs. Further, the control unit 90 has an I / O interface 94 as an input / output port connected to an external device, and an A / D conversion unit 95 that converts an analog signal into a digital signal.

A first toner remaining amount sensor 51, a second toner remaining amount sensor 52, a mounting sensor 53, and an open / close sensor 54 are connected to the input side of the control unit 90. In the mounting sensor 53, the toner pouch 40 is the developing container 32. It is detected that it is attached to the supply port 32a. For example, the mounting sensor 53 is provided at the replenishment port 32a and includes a pressure-sensitive switch that outputs a detection signal when pressed by the protrusion 42 of the toner pouch 40. Further, the open / close sensor 54 detects whether or not the open / close member 83 is opened with respect to the top cover 82. The open / close sensor 54 is composed of, for example, a pressure sensitive switch or a magnetic sensor.

Further, the control unit 90 is connected to the operation unit 300, the image forming unit 10, and the toner remaining amount panel 400 as a notification means capable of notifying information on the toner remaining amount, and the operation unit 300 is connected to the operation unit 300. It has a display unit 301 capable of displaying various setting screens, a physical key, and the like. The display unit 301 is composed of, for example, a liquid crystal panel. The image forming unit 10 has a motor M1 as a drive source for driving the photosensitive drum 21, the developing roller 31, the supply roller 33, the stirring member 34, and the like. The photosensitive drum 21, the developing roller 31, the supply roller 33, and the stirring member 34 may be driven by separate motors.

As shown in FIGS. 1B and 17, the toner remaining amount panel 400 is provided on the right side of the front surface of the housing of the printer main body 100, that is, on the side opposite to the operation unit 300 arranged on the left side. Information on the remaining amount of toner in the developing container 32 is displayed. In the present embodiment, the toner remaining amount panel 400 is a panel member composed of a plurality of (three in the present embodiment) scales arranged vertically, and each scale is the Low level, Mid level, and Full level. It corresponds to.

That is, as shown in FIG. 17A, when only the lower scale is lit, the remaining amount of toner in the developing container 32 indicates the Low level as the third state. As shown in FIG. 17B, when the lower and central scales are lit and the upper scale is off, the remaining amount of toner in the developing container 32 indicates the Mid level as the second state. .. As shown in FIG. 17C, when all three scales are lit, the remaining amount of toner in the developing container 32 indicates the Full level as the first state. The toner remaining amount panel 400 is not limited to the liquid crystal panel, and may be composed of a light source such as an LED or an incandescent lamp and a diffusion lens. In the example shown in FIG. 17, it has been described as a notification means indicating the remaining amount of toner, but the present invention is not limited to this. For example, the display of FIG. 17A is a display indicating that toner replenishment is required, the display of FIG. 17B is a display indicating that toner replenishment is not required, and the display of FIG. 17C is a display of toner replenishment. May be used as an indication that the above has been sufficiently performed.

[Toner replenishment process]
Next, a toner replenishment process for replenishing the toner in the toner pouch 40 to the developing container 32 will be described. As shown in FIG. 13, when the toner replenishment process is started, the control unit 90 determines whether or not there is an instruction to start the replenishment operation (step S1). In the present embodiment, the replenishment operation start instruction is a user operation by the operation unit 300, as shown in FIG. Specifically, the replenishment operation start instruction is output by pressing the button 1 in a state where the user operates the operation unit 300 and displays a message prompting the operation of the button 1 on the display unit 301.

At this time, since the toner pouch 40 is attached to the replenishment port 32a of the developing container 32, the opening / closing member 83 is in an open state. Since the operation unit 300 and the replenishment port 32a are both arranged on the right side of the device, it is possible to easily perform the toner replenishment work using the toner pouch 40 while operating the operation unit 300. When the open / close sensor 54 detects that the open / close member 83 has been opened, the control unit 90 prohibits and stops the image forming operation by the image forming device 1. Therefore, when the opening / closing member 83 is opened, each of the transport rollers, the photosensitive drum 21, the scanner unit 11, and the like of the image forming apparatus 1 are stopped.

The replenishment operation start instruction is not limited to the pressing operation of the button 1, but the replenishment operation is performed according to the touch operation on the display unit 301 or the detection of the toner pouch 40 being attached to the replenishment port 32a by the attachment sensor 53. A start instruction may be output. Further, a sensor for detecting that the second shutter 41 of the toner pouch 40 has been opened may be provided, and a replenishment operation start instruction may be output based on the detection result of this sensor. Further, the replenishment operation start instruction may be output based on the fact that the opening / closing sensor 54 detects the opening operation of the opening / closing member 83. Further, when the opening / closing member 83 is opened, the high-voltage power supply applied to the process cartridge 20 may be turned off so that only the motor M1 that drives the stirring member 34 can be driven.

When it is determined that the replenishment operation start instruction has been given (step S1: Yes), the control unit 90 initializes the parameters of the timers T1 and T2, which will be described later, to initial values (for example, zero), and starts the timers T1 and T2 (for example, zero). Step S2). Then, the control unit 90 drives the motor M1 (step S3), and the stirring member 34 rotates.

Next, the control unit 90 executes the toner remaining amount detection process (step S4). When the toner remaining amount detection process is executed, as shown in FIG. 14, the control unit 90 causes the light emitting units 51a and 52a of the first toner remaining amount sensor 51 and the second toner remaining amount sensor 52 to emit light (step S41). ). Then, the control unit 90 uses the A / D conversion unit 95 to digitally signal (hereinafter, A) the voltages V1 and V2 output by the light receiving units 51b and 52b of the first toner remaining amount sensor 51 and the second toner remaining amount sensor 52, respectively. (Used as a / D conversion value) (step S42).

Next, the control unit 90 determines whether or not the A / D conversion value of the voltage V2 indicates that the optical path Q2 is shielded from light (step S43). When it indicates that the optical path Q2 is shielded from light (step S43: Yes), the control unit 90 causes the toner remaining amount panel 400 to display that the toner remaining amount is at the Full level (step S44). That is, as shown in FIG. 17C, all three scales of the toner remaining amount panel 400 are lit.

When the A / D conversion value of the voltage V2 does not indicate that the optical path Q2 is shielded (step S43: No), the control unit 90 is in the developing container 32 based on the A / D conversion value of the voltage V1. Toner remaining amount information is calculated (step S45). Then, the control unit 90 causes the toner remaining amount panel 400 to display that the toner remaining amount is the Low level or the Mid level based on the calculated toner remaining amount information (step S46). When step S44 or step S46 is completed, the toner remaining amount detection process ends. That is, the first toner remaining amount sensor 51 and the second toner remaining amount sensor 52 as the detecting means have the remaining amount information according to the amount of the developing agent stored in the developing container 32 while the stirring member 34 is operating. Is output.

Next, as shown in FIG. 13, the control unit 90 determines whether or not the timer T2 is equal to or higher than the threshold value β (step S5). The threshold value β is a preset value and corresponds to an interval in which the toner remaining amount detection process is repeatedly executed. In addition, α> β. When the timer T2 is equal to or higher than the threshold value β (step S5: Yes), the control unit 90 initializes the timer T2 and restarts it (step S6), and returns to step S4. That is, every time the timer T2 reaches the threshold value β, the toner remaining amount detection process (step S4) is repeatedly performed. For example, when the threshold value β is set to 1 second, the toner remaining amount detection process is repeated every 1 second in steps S4, S5, and S6.

When the timer T2 is less than the threshold value β (step S5: No), the control unit 90 determines whether or not the timer T1 is equal to or more than the threshold value α (step S7). The threshold value α is a preset value and corresponds to the driving time of the motor M1 and the stirring member 34 in the toner replenishment process. If the timer T1 is less than the threshold value α (step S7: No), the process returns to step S5. When the timer T1 is equal to or higher than the threshold value α (step S7: Yes), the control unit 90 stops driving the motor M1 (step S8) and ends the toner replenishment process. For example, when the threshold value α is set to 10 seconds, it takes 10 seconds from the start of driving of the motor M1 in step S3 to the stop of the motor M1 in step S8.

In the toner replenishment process described above, when the toner drops from the toner pouch 40 into the developing container 32 as shown in FIG. 16A, the toner enters the transport chamber 36 through the first protrusion 37. Since the supply port 32a and the first protruding portion 37 are arranged at one end in the longitudinal direction of the developing container 32, toner is collectively supplied to the one end side of the transport chamber 36.

Here, consider a case where the stirring member 34 is not rotating when the toner is supplied to the transport chamber 36. When toner is dropped from the toner pouch 40 into the developing container 32, if the stirring member 34 is not rotated in the transport chamber 36 that houses the toner, it takes time for the dropped toner to spread over the entire length of the photosensitive drum 21. Needs. If this time becomes long, it takes time for the user who is performing the toner replenishment work to confirm that the toner has been replenished in the transport chamber 36, which deteriorates usability.

Therefore, in the present embodiment, in the toner replenishment process, the stirring member 34 is driven for a predetermined time (threshold value α) from the start of replenishment. As a result, as shown in FIGS. 16B and 16C, the toner supplied from the toner pouch 40 to one end of the developing container 32 reaches the total length in the longitudinal direction of the transport chamber 36 of the developing container 32 by the stirring member 34. It is leveled early over. Therefore, the time until the user confirms that the toner has been replenished can be shortened, and usability can be improved. Further, since the toner contained in the developing container 32 is leveled, the accuracy of detecting the toner remaining amount information by the first toner remaining amount sensor 51 and the second toner remaining amount sensor 52 can be improved.

Then, during the toner replenishment process, the remaining amount information of the toner in the developing container 32 is detected by the first toner remaining amount sensor 51 and the second toner remaining amount sensor 52 at predetermined time (threshold β) intervals. For example, as shown in FIG. 17A, the user supplies toner from the toner pouch 40 to the developing container 32 in a state where the toner remaining amount panel 400 indicates that the toner remaining amount is at the Low level.

Then, the toner remaining amount panel 400 displays that the toner remaining amount is at the Mid level as shown in FIG. 17B, and then the toner remaining amount is at the Full level as shown in FIG. 17C. Is displayed. As a result, the user can surely recognize that the toner has been replenished from the toner pouch 40 to the developing container 32, and usability can be improved.

Here, the cross-sectional views of FIGS. 16A to 16C show the cross sections of 16A-16A of FIG. In FIGS. 16A and 16B, it is shown that the light emitting portion 52a is arranged at the right end in the longitudinal direction of the photosensitive drum 21. It is assumed that the light receiving unit 51b, the light emitting unit 52a, and the light receiving unit 52b are also arranged at the same / substantially the same longitudinal position of the photosensitive drum 21. Due to sensor placement restrictions within the device body, sensor placement may be as shown in FIGS. 16A and 16B. Even in such a case, the usability can be improved as described above by rotating the stirring member 34 when replenishing the toner.

Further, in some cases, the sensor may be arranged in the vicinity immediately below the supply port 32a. In such a case, as shown in FIG. 16B, the replenished toner may be biased to the left side, and it may take time for the toner agent surface to be leveled over the entire length of the photosensitive drum 21. .. In order to detect an accurate toner replenishment state, it is necessary that the toner agent surface is leveled over the entire length of the photosensitive drum 21. However, even in such a case, in this embodiment, the rotation of the stirring member 34 at the time of replenishing the toner causes the toner agent surface to be leveled over the entire length of the photosensitive drum 21 in a short time, and usability can be improved.

[Relationship between the amount of toner filled in the toner pouch 40 and the volume of the developing container 32]
Next, the relationship between the amount of toner filled in the toner pouch 40 and the volume of the developing container 32 will be described. As shown in FIG. 18A, the developing container 32 can contain the toner of Z [g]. In addition, in FIGS. 18 (a) to 18 (c), although it is expressed in terms of grams (g), it may be converted into a unit indicating a volume such as milliliter (ml).

When the toner contained in the developing container 32 is 0 [g] to X [g], the toner remaining amount panel 400 is based on the detection results of the first toner remaining amount sensor 51 and the second toner remaining amount sensor 52. Is a Low level display. X [g] corresponds to the second amount, and the toner amount of 0 [g] to X [g] corresponds to the toner amount less than the second amount.

When the toner contained in the developing container 32 is X [g] to Y [g], the toner remaining amount panel 400 is based on the detection results of the first toner remaining amount sensor 51 and the second toner remaining amount sensor 52. Is a Mid level display. Y [g] corresponds to the first amount, and the toner amount of X [g] to Y [g] corresponds to the toner amount less than the first amount.

When the toner contained in the developing container 32 is Y [g] or more, the toner remaining amount panel 400 is at the Full level based on the detection results of the first toner remaining amount sensor 51 and the second toner remaining amount sensor 52. It becomes a display. A toner amount of Y [g] or more corresponds to a toner amount of the first amount or more.

FIG. 18B is a graph showing the amount of toner when the developing container 32 is replenished with toner by the toner pouch 40 filled with A [g] of toner. FIG. 18C is a graph showing the amount of toner when the developing container 32 is replenished with toner by the toner pouch 40 filled with B [g] (> A) of toner. The product lineup of the toner pouch 40 includes either a small-capacity toner pouch filled with only A [g] of toner and a large-capacity toner pouch filled with only B [g] of toner. It may be. Further, the product lineup of the toner pouch 40 is not limited to two types, and three or more types may be prepared.

In the present embodiment, the amount of toner (A, B) filled in the toner pouch 40 as a replenishment container satisfies the following formulas (1) and (2).
Y ≤ A <Z-Y ... (1)
Y ≤ B <Z-Y ... (2)
As shown in FIG. 18B, when the toner remaining in the developing container 32 is R [g] between 0 [g] and X [g], the toner pouch 40 develops the toner by A [g]. When the container 32 is replenished, the toner of (R + A) [g] is contained in the developing container 32. Since Y <(R + A) according to the above formula (1), the toner remaining amount panel 400 after toner replenishment displays the full level. That is, Y [g], which is the threshold value of Full level, is smaller than the replenishment amount A [g] replenished from the toner pouch 40.

Further, as shown in FIG. 18C, when the toner remaining in the developing container 32 is R [g], when the toner pouch 40 replenishes the developing container 32 with only B [g] of toner, the developing container 32 is filled with toner. Will contain (R + B) [g] toner. Since Y <(R + B) according to the above formula (2), the toner remaining amount panel 400 after toner replenishment displays the full level.

In this way, the volume of the developing container 32 is such that the toner remaining amount panel 400 is always at the Full level by replenishing the toner when the toner remaining amount panel 400 is displayed at the Mid level or the Low level. Set. The volume of the developing container 32 does not necessarily have to be set to the full level by one toner pouch 40. For example, by replenishing a plurality of toner pouches 40 containing a small amount of toner, the volume can be set to the full level. It may be.

Further, from the above equations (1) and (2), the volume of the developing container 32 is the total amount of toner filled in the toner pouch 40 when the toner remaining amount panel 400 is displayed as Mid level or Low level. It is set so that it can be moved to the developing container 32. That is, the maximum amount of the developer that can be contained in the developing container 32 is the amount of the developer (A [g] or B [g] that the toner pouch 40 can contain at Y [g], which is the boundary between the Full level and the Mid level. ]) Is greater than the sum of the values. In other words, the amount of toner filled in the toner pouch 40 is the maximum amount of toner that can be accommodated in the developing container 32 (Z [g]) and the remaining amount of toner at the boundary between the Mid level and the Full level (Y []. g]), which is less than the difference between.

As a result, the developing container 32 is not filled with toner while the developing container 32 is being replenished with toner using the toner pouch 40, and it is possible to reduce the leakage of toner from the replenishment port 32a during toner replenishment. ..

As described above, in the present embodiment, the discharge tray 81 of the top cover 82 is formed with the second opening 82a, and the top cover 82 is further provided with the opening / closing member 83 that is supported so as to be openable / closable. The opening / closing member 83 covers the second opening 82a in the closed state, and exposes the supply port 32a of the developing container 32 in the open state. Therefore, the user can access the supply port 32a simply by opening the opening / closing member 83.

Since this embodiment employs a method of directly replenishing the developing container 32 with toner from the replenishment port 32a by the toner pouch 40 (direct replenishment method), the process cartridge 20 is used to replenish the toner to the developing container 32. There is no need to take out. Further, since the supply port 32a of the developing container 32 is formed on the upper surface of the first protruding portion 37 protruding upward from one end in the longitudinal direction of the transport chamber 36, it is arranged close to the second opening 82a. ing. Therefore, the user can easily perform the toner replenishment work to the developing container 32 through the replenishment port 32a. Further, when the toner is replenished to the developing container 32, parts such as the developing roller 31 and the supply roller 33 are not replaced, so that the cost can be reduced.

Further, since the laser passage space SP is formed so as to be surrounded by the first protruding portion 37, the second protruding portion 38, the handle portion 39, and the transport chamber 36, the developing container 32 and the scanner unit 11 are arranged close to each other. The image forming apparatus 1 can be miniaturized.

Further, when the toner pouch 40 is attached to the replenishment port 32a and the toner replenishment work is performed, the stirring member 34 is driven, so that the replenishment port 32a is arranged on one end side in the longitudinal direction of the developing container 32. , Packing phenomenon can be reduced. As a result, image defects can be reduced, and the detection accuracy of toner remaining amount information can be improved.

The maximum amount of the developer that can be contained in the developing container 32 is the amount of the developer (A [g] or B [g] that the toner pouch 40 can accommodate at Y [g], which is the boundary between the Full level and the Mid level. ]) Is set to be larger than the added value. Therefore, the developing container 32 is not filled with toner while the developing container 32 is being replenished with the toner using the toner pouch 40, and it is possible to reduce the leakage of toner from the replenishment port 32a during the replenishment of the toner. .. By configuring the image forming apparatus 1 in this way, it is possible to provide a form of the image forming apparatus that satisfies the needs of the user.

In the present embodiment, in the toner replenishment process, the stirring member 34 is driven for a predetermined time (threshold value α) based on the operation of the button 1 of the operation unit 300 by the user, but the present invention is not limited to this. For example, pressing the button 1 once may start driving the stirring member 34, and pressing the button 1 again may stop driving the stirring member 34. Further, the stirring member 34 may be driven only while the button 1 is held down.

Further, when the remaining amount of toner in the developing container 32 reaches the Low level, a replenishment notification for prompting toner replenishment may be displayed on the display unit 301. Further, when the toner runs out, a replenishment notification for urging the toner replenishment may be displayed on the display unit 301.

Further, the remaining amount of toner in the developing container 32 is notified to the user by the remaining amount of toner panel 400, but it does not have to be composed of three scales as in the present embodiment. For example, the toner remaining amount panel 400 may be composed of one, two, or four or more scales. Further, the toner remaining amount may be continuously displayed by the percentage display or the gauge display. Further, the user may be notified of the remaining amount of toner by voice using a speaker.

[Toner pouch]
Here, the configuration of the toner pouch 40 as a toner container that is detachable from the image forming apparatus, can be attached to the supply port 32a provided in the developing container 32, and houses the toner will be described in detail with reference to the drawings. explain.

FIG. 26 is a perspective view showing the entire toner pouch 40. The toner pouch 40 holds a pouch 503 as a container for containing toner, a replenishment base 501 as a cap attached to the pouch, a rotatable second shutter 41, and a second shutter 41, and rotates together with the second shutter 41. Includes a shutter holder 502 to be used.

27 and 28 are perspective views showing the components constituting the toner pouch 40 in an exploded manner. The toner pouch 40 is composed of a second shutter 41, a second sheet 505, a second seal 504, a replenishment base 501, a shutter holder 502, and a pouch 503 in this order from one end thereof. The second shutter 41 is configured to be rotatable about the rotation axis z shown in FIGS. 27 and 28. The pouch 503 has a pouch opening 503a as a first opening. The second shutter 41 has a shielding portion 41f, a second shutter opening 41i, and a central hole 41j.

The toner pouch 40 further has a second sheet 505. The second sheet 505 is a PET (polyethylene terephthalate) resin film having a thickness of 100 μm, and is attached to the shielding portion 41f of the second shutter 41 with double-sided tape. The film used in the second sheet 505 is preferably made of a PET resin or PP (polypropylene) resin having a thickness of 50 to 300 μm.

FIG. 29 is a perspective view of the second shutter 41 to which the second sheet 505 is fixed. FIG. 29 (a) is a view of the second shutter 41 from the inside (the side with the pouch 503), and FIG. 29 (b) is a view of the second shutter 41 from the outside (the side opposite to the side with the pouch 503). It is a figure. The second sheet 505 is fixed to the shielding portion 41f so that the end portion 505a of the second shutter 41 in the rotational direction protrudes from the end surface 41h of the shielding portion 41f in the rotational direction of the second shutter 41.

FIG. 30 shows a replenishment base 501 to which the second seal 504 is attached. 30 (a) and 30 (b) show a perspective view of the replenishment base 501, and FIG. 30 (c) shows a cross-sectional view of the replenishment base 501. The second seal 504 is made of a material such as deformable urethane foam or non-woven fabric, and is fixed to the supply base 501 with double-sided tape or the like. The replenishment base 501 has an upstream opening 501a, a downstream opening 501b, and a pipe portion 501c connecting the upstream opening 501a and the downstream opening 501b. The upstream opening 501a is a receiving port that receives toner from the pouch 503 through the pouch opening 503a, and is a communication hole that communicates with the inside of the pouch 503. The downstream opening 501b is a supply port for supplying the toner received by the upstream opening 501a to the developing container 32. The tube portion 501c is a hollow tube configured so that the toner received at the upstream opening 501a can move to the downstream opening 501b. The pipe portion 501c of the supply base 501 shown in FIG. 30 is configured to branch from one upstream opening 501a to two downstream openings 501b. The two pipe portions 501c are provided symmetrically with respect to the rotation axis z. The opening 503a of the pouch 503 and the upstream opening 501a of the replenishment base 501 are provided at positions intersecting the rotation axis z when viewed in the direction of the rotation axis z. On the other hand, the downstream opening 501b of the supply base 501 is provided at a position that does not intersect the rotation axis z. That is, the pipe portion 501c extends in a direction inclined with respect to the rotation axis z. By passing the toner in the pouch 503 through the inclined tube portion 501c, it becomes possible to supply the toner intermittently to the developing device 32 as compared with the case where the toner passes through the tube portion extending in the direction of the rotation axis z. The amount is stable.

The second seal 504 fixed to the replenishment base 501 is provided with an opening 504a corresponding to the position of the downstream opening 501b of the replenishment base 501. The toner supplied from the pouch 503 through the upstream opening 501a of the replenishment base 501 passes through the pipe portion 501c, the downstream opening 501b, and the opening 504a of the second seal 504, and moves to the developing container 32. become.

Since the second seal 504 is fixed to the replenishment base 501, toner leakage at the interface thereof is unlikely to occur. On the other hand, the sliding surface 504b of the second seal 504 fixed to the replenishment base 501 is configured to slide with the sliding surface 505b (FIG. 29) of the second sheet 505 fixed to the second shutter 41. There is. The second seal 504 is pressed by the second sheet 505 in the direction of the rotation axis z to be deformed, and a surface pressure is generated between the sliding surface 504b of the second seal 504 and the sliding surface 505b of the second sheet 505. It is configured to be made to. As a result, toner leakage at the interface between the second seal 504 and the second sheet 505 is suppressed.

The second shutter 41 to which the second sheet 505 is fixed is configured to be rotatable about the rotation axis z with respect to the supply base 501 to which the second seal 504 is fixed. The details will be described below. FIG. 31 shows a cross-sectional view perpendicular to the direction orthogonal to the rotation axis z of the toner pouch 40. The inner diameter portion 41b of the second shutter 41 and the outer diameter portion 501d of the replenishment base 501 are cylindrical parts having the rotation axis z concentric with each other, and are configured to be slidable with each other. Further, the cylindrical portion 41c of the second shutter 41 and the inner diameter portion 501e of the supply base 501 are cylindrical parts having the rotation axis z concentric, and are configured to be slidable with each other. Here, the shutter holder 502 is arranged on the side opposite to the second shutter 41 with respect to the supply base 501 in the direction of the rotation axis z, and is fixed to the second shutter 41. Specifically, the surface 502b of the shutter holder 502 is adhered to the surface 41d of the second shutter 41. Further, the concave portion 502c (FIG. 27) of the shutter holder 502 engages with the convex portion 41e (see FIG. 26) of the second shutter 41, so that the shutter holder 502 is fixed to the second shutter 41 in the rotational direction. ing. The shutter holder 502 is configured to rotate about the rotation axis z with respect to the supply base 501 together with the second shutter 41. The rib 502a (FIG. 31) of the shutter holder 502 abuts on the surface 501f of the replenishment base 501, so that the replenishment base 501 is restricted from moving in the rotation axis z direction.

That is, the second seal 504 is pressed by the second sheet 505 and deformed, and the replenishment base 501 is supported between the second shutter 41 and the shutter holder 502 so as to maintain the deformation amount. Therefore, a surface pressure is generated between the sliding surface 504b of the second seal 504 and the sliding surface 505b of the second sheet. With the above configuration, leakage of the toner contained in the pouch 503 of the toner pouch 40 to the outside is suppressed in the state of the toner pouch 40 alone.

FIG. 32 shows the coupling state of the supply base 501 and the pouch 503. The opening 503a of the pouch 503 is coupled to the outer ring 501g of the upstream opening 501a of the supply base 501. The upstream opening 501a of the replenishment base 501 and the opening 503a of the pouch 503 are joined by heat welding or an adhesive method. The toner in the pouch 503 moves toward the replenishment base 501 through the opening 503a of the pouch 503 and the upstream opening 501a of the replenishment base 501. This toner passes through the pipe portion 501c of the replenishment base 501, the downstream opening 501b, and the like, and moves to the developing container 32.

The material of the pouch 503 is preferably a sheet of PE (polyethylene) resin, PP resin, or PET resin, a composite material thereof, a non-woven fabric or paper, and a composite material with the resin thereof. When the pouch 503 is made of a member that can be deformed by the user, the toner in the pouch 503 can be easily supplied to the outside of the toner pouch 40 by the user pressing or squeezing the pouch 503 with a finger. .. As described above, if the toner pouch 40 is a bottle container 40B, it is preferable that the user hits the container to vibrate and leak the toner.

As described above, the second shutter 41 and the shutter holder 502 are fixed to each other, and the replenishment base 501 and the pouch 503 are fixed to each other. On the other hand, the second shutter 41 is configured to be rotatable about the rotation axis z with respect to the supply base 501. Hereinafter, a shielded state by the second shutter 41 (second sheet 505) of the downstream opening 501b (opening 504a of the second seal 504) of the supply base 501 and an open state will be described.

FIG. 33A is a perspective view of the toner pouch 40 when the second shutter 41 is in a closed position to shield the downstream opening 501b as a supply port of the toner pouch 40. FIG. 33B is a perspective view of the toner pouch 40 when the second shutter 41 is in the closed position retracted from the closed position so as to open the downstream opening 501b. FIG. 33B shows a state in which the second shutter 41 is rotated about 60 degrees in the direction of arrow z1 together with the shutter holder 502 about the rotation axis z from the open position. The downstream opening 501b of the replenishment base 501 is exposed to the outside of the toner pouch 40, and the toner contained in the pouch 503 can be supplied to the outside. From the state shown in FIG. 33B, by rotating the second shutter 41 and the shutter holder 502 in the direction of arrow z2 about the rotation axis z, the downstream opening 501b of the toner pouch 40 is again shielded by the shutter 41. It can be returned to the normal state (Fig. 33 (a)). After the toner pouch 40 is mounted on the developing container 32, the body portion 502d of the shutter holder 502 is rotated by the user in the direction of arrow z1 about the rotation axis z, so that the second shutter 41 is rotated. As a result, the downstream opening 501b of the replenishment base 501 is exposed, and the toner in the pouch 503 can be supplied to the developing container 32.

[Development container]
The configuration of the developing container 32 as the main body accommodating portion (toner accommodating portion) to which the toner is supplied from the toner pouch 40 will be described with reference to the drawings. FIG. 34 is a perspective view of the vicinity of the supply port 32a of the developing container 32. The supply port 32a is a receiving port for receiving the toner supply from the toner pouch 40. FIG. 35 is a perspective view showing the supply port 32a of the developing container 32 and its peripheral portion in an exploded manner. The first seal 506, the first shutter 507, the shutter cover 508, and the first seal 509 are arranged on the supply port 32a of the developing container 32 so as to overlap in this order. FIG. 34 (a) shows a state in which the supply port 32a is shielded by the first shutter 507, and FIG. 34 (b) shows a state in which the supply port 32a is open.

As shown in FIGS. 34 and 35, the developing container 32 is provided with a shaft portion 322 that is provided coaxially with the rotation axis z and extends in the direction of the rotation axis z. The shaft portion 322 has a cylindrical portion 32d and a two-way shaped portion 32e provided on the tip side of the cylindrical portion 32d. The first shutter 507 has a surface 507e as a substantially fan-shaped shielding portion, a first through hole 507a, and a central hole 507e. By fitting the central hole 507e into the cylindrical portion 32d of the shaft portion 322, the first shutter 507 can rotate about the axis (rotation axis z) of the shaft portion 322.

The two-way shape portion 32e of the shaft portion 322 penetrates the central hole 506b of the first seal 506, the central hole 507b of the first shutter 507, and the central hole 508e of the shutter cover 508, and extends to the toner pouch 40 side. ing. The function of the two-way shape portion 32e of the shaft portion 322 will be described later.

The first seal 506 is made of a material such as deformable urethane foam or non-woven fabric, and is fixed to the developing container 32 with double-sided tape or an adhesive. The first seal 506 is provided with a through hole 506a at a position corresponding to the supply port 32a of the developing container 32. The developing container 32 is provided with a discharge port 32c separately from the supply port 32a, and the first seal 506 is also provided with a through hole 506c at a position corresponding to the discharge port 32c of the developing container 32.

A first shutter 507 is arranged on the first seal 506. Further, a shutter cover 508 is arranged on the first shutter 507. FIG. 37 shows a cross-sectional view of the peripheral portion of the supply port 32a of the developing container 32, which is perpendicular to the direction orthogonal to the rotation axis z.

The shutter cover 508 is fixed to the developing container 32. The surface 508a of the shutter cover 508 is adhered to the surface 32f of the developing container 32 in a state where the concave portion 508b of the shutter cover 508 is engaged with the convex portion 32g (FIG. 35) of the developing container 32. That is, the shutter cover 508 is positioned with respect to the developing container 32 in a predetermined rotation phase. The first shutter 507 is arranged between the first seal 506 provided on the developing container 32 and the shutter cover 508, and is rotatably supported by the developing container 32 about the rotation axis z.

As shown in FIG. 37, the outer ring 507c of the first shutter 507 and the inner diameter portion 508c of the shutter cover 508 are a part of a cylindrical shape provided coaxially with the axis (rotational axis z) of the shaft portion 322. The first shutter 507 is configured so that the outer ring 507c of the first shutter 507 can rotate with respect to the shutter cover 508 while sliding with the inner diameter portion 508c of the shutter cover 508. On the other hand, the surface 507d of the first shutter 507 abuts on the surface 508d of the shutter cover 508, and the movement of the first shutter 507 in the direction of the rotation axis z is restricted. The first shutter 507 is supported between the shutter cover 508 and the developing container 32 so that the first seal 506 is pressed from the first shutter 507 in the rotation axis z direction to maintain the compressed state. There is. As a result, leakage of toner from the developing container 32 is suppressed in the state of the developing container 32 alone.

38 (a) and 38 (b) are perspective views of the shutter cover 508. 38 (c) and 38 (d) show the shutter cover 508 to which the first seal 509 is attached. The first seal 509 is made of a material such as deformable urethane foam or non-woven fabric. As shown in FIG. 38B, the first seal 509 is attached to the surface 508f and the surface 508g of the shutter cover 508 with double-sided tape or the like. The surface 508f of the shutter cover 508 is a surface 508f facing the first shutter 507 and perpendicular to the rotation axis z. The surface 508g of the shutter cover 508 is a surface opposite to the surface 508f in the rotation axis z direction.

The first shutter 507 is rotatably supported with respect to the rotation axis z. The first shutter 507 rotates between the shielding position (first position) shown in FIG. 34 (a) and the open position (second position) shown in FIG. 34 (b). The shielding position is a position where the surface 507e overlaps with the replenishment port 32a when viewed in the direction of the rotation axis z, and the developing container 32 cannot receive the toner supply from the toner pouch 40. The open position (second position) is a position where the first through hole 507a overlaps with the replenishment port 32a, and the developing container 32 is a position where the toner can be supplied from the toner pouch 40.

[Toner pouch and developing container engagement and shutter opening / closing operation]
FIG. 39 (a) shows a state in which the toner pouch 40 is attached to the developing container 32 shown in FIG. 34 (a) in which the replenishment port 32 a is shielded by the first shutter 507.

When the toner pouch 40 is attached to the developing container 32, the two-way shaft portion 32e of the developing container 32 is inserted into the two-way taking hole 501h of the replenishment base 501, and the two-way shaft portion 32e engages with the two-way taking hole 501h. To do. In other words, the two-way take hole 501h of the toner pouch 40 is configured to be engageable with the two-way take shaft portion 32e of the developing container 32. Further, the substantially fan-shaped surface 507e (FIG. 34 (a)) of the first shutter 507 is in contact with the substantially fan-shaped surface 41f (FIG. 33 (a)) of the second shutter 41.

The case where the user grabs the body portion 502d of the shutter holder 502 and rotates the shutter holder 502 in the direction of arrow z1 in the state shown in FIG. 39A will be described. Since the shutter holder 502 and the second shutter 41 are fixed as described above, the second shutter 41 also rotates in the arrow z1 direction in conjunction with the rotation of the shutter holder 501. At this time, the surface 41g (FIG. 33) of the second shutter 41 abuts on the rib 507f (FIG. 34) of the first shutter 507, presses the first shutter 507 in the direction of arrow z1, and presses the first shutter 507 in the direction of arrow z1. Rotate in the direction. The surface 41g of the second shutter 41 and the surface of the rib 507f of the first shutter 507 extend in the direction of the rotation axis z.
The surface 41g of the second shutter 41 as the engaging portion engages with the rib 507f of the first shutter 507 as the engaged portion, so that the first shutter 507 rotates together with the second shutter 41. ing.

In FIGS. 33 (a) and 34 (a), the second shutter 41 and the first shutter 507 are 60 in the arrow z1 direction about the rotation axis z from the states shown in FIGS. 33 (b) and 34 (b), respectively. The state of the toner pouch 40 rotated by ° and the developing container 32 is shown. The toner pouch 40 of FIG. 33B is in a state where the second shutter opening 41i of the second shutter 41 overlaps with the downstream opening 501b of the replenishment base 501 and the downstream opening 501b is exposed. In this state, the toner contained in the toner pouch 40 can be supplied to the developing device 32. The developing container 32 of FIG. 34A is in a state where the replenishment port 32a is exposed and is in a state where toner can be received from the toner pouch 40.
The shaft portion 322 of the developing container 32 is fixed so as not to rotate around the rotation axis z. Therefore, the supply base 501 and the pouch 503 that are engaged with the two-way shaft portion 32e of the shaft portion 322 at the two-way hole 501h do not rotate. That is, when the user rotates the body portion 502d of the shutter holder 502, the second shutter 41 and the first shutter 507 only rotate, and the supply base 504 and the pouch 503 do not rotate. As shown in FIG. 7, since the user deforms the pouch 503 to supply the toner of the pouch 503 to the developing device 32, the pouch 503 is easily deformed. Therefore, the operability is better in the configuration in which the pouch 503 is fixed to the developing device 32 and the body portion 502d of the shutter holder 502 is rotated than in the configuration in which the pouch 503 can be held and rotated. Further, it may be better that the pouch 503 does not rotate and always faces a predetermined direction. For example, when the pouch 503 is displayed with instructions for replenishing toner or has an instruction label attached. In such a case, it is meaningful to improve the visibility of the user of the pouch 503 by configuring the pouch 503 so that it does not rotate.

Next, an operation of detaching the toner pouch 40 mounted on the developing container 32 from the developing device 32 will be described. From the state shown in FIG. 39B, consider an operation of rotating the body portion 502d of the shutter holder 502 in the direction of arrow z2 about the rotation axis z. Since the shutter holder 502 and the second shutter 41 are fixed, the second shutter 41 also rotates in the arrow z2 direction in conjunction with the shutter holder 501. At this time, the surface 41h (FIG. 33) of the second shutter 41 presses the surface 507g (FIG. 34) provided on the first shutter 507, and the first shutter 507 rotates. Further, since the first shutter 507 is rotatably supported around the rotation axis z, the first shutter 507 is also rotatably supported around the rotation axis z in the direction of arrow z2 about the rotation axis z in conjunction with the rotation operation of the shutter holder 501. It will rotate. By rotating the shutter holder 502 in the direction of arrow z2 by 60 °, the supply port 32a as shown in FIGS. 33 (a), 34 (a), and 39 (a) can be returned to the shielded state. It is possible. Even when the first shutter 507 and the second shutter 41 are closed, the toner pouch 40 does not rotate.

Next, a method for suppressing toner leakage when the first shutter 507 and the second shutter 41 are opened and closed will be described. FIG. 40 is a schematic cross-sectional view of an interface portion between the toner pouch 40 and the developing container 32 when the toner pouch 40 is mounted on the developing container 32. In FIG. 40, the pouch 503 is omitted. FIG. 40A shows a state before the toner pouch 40 is attached. FIG. 40 (b) shows the state before the toner pouch 40 is mounted on the developing container 32 and the first shutter 507 and the second shutter 41 are rotated from the state shown in FIG. 40 (a). In this state, the replenishment port 32a of the developing device 32 and the downstream opening 501b of the replenishment base 501 are shielded, and the toner contained in the pouch 503 is not discharged to the outside of the toner pouch 40. .. Further, FIG. 40 (c) shows a state in which the second shutter 41 is rotated by an angle θ1 (0 <θ1) in the direction of arrow z1 about the rotation axis z from the state shown in FIG. 40 (b). The rotation of the second shutter 41 in the arrow z1 direction about the rotation axis z is shown in FIG. 40 as the left direction (arrow z1 direction) in the figure. Further, FIG. 40 (d) shows a state in which the second shutter 41 is rotated by an angle θ2 (θ1 <θ2) in the direction of arrow z1 about the rotation axis z from the state shown in FIG. 40 (b). Further, FIG. 40 (e) shows a state in which the second shutter 41 is rotated by 60 ° in the direction of arrow z1 about the rotation axis z from the state shown in FIG. 40 (b), and is downstream of the supply port 32a and the supply base 501. It shows a state in which the side opening 501b is exposed. In FIG. 40B, with the toner pouch 40 mounted on the developing container 32, the end portion 505a of the second shutter 41 of the first sheet 505 in the rotational direction comes into contact with the surface 507h of the first shutter 507. It is located in. Further, the rib 507f of the first shutter 507 and the surface 41g of the second shutter 41 are arranged with a gap δ1 in the rotation direction of the second shutter 41. Further, the surface 507g of the first shutter 507 and the surface 41h of the second shutter 41 are arranged with a gap δ2 in the rotation direction of the second shutter 41. The gap δ1 and the gap δ2 between the first shutter 507 and the second shutter 41 are play when the user attaches the toner pouch 40 to the developing container 32. By providing the gap δ1 and the gap δ2, it is possible to improve the mountability of the toner pouch 40 to the developing container 32. When the gap δ1 becomes narrower, the gap δ2 widens, and when the gap δ1 becomes wider, the gap δ2 becomes narrower.

After the toner pouch 40 is mounted on the developing container 32, the second shutter 41 is rotated in the direction of arrow z1 about the rotation axis z. FIG. 40 (c) shows a state in which the gap δ1 existing in FIG. 40 (b) has disappeared, and the rib 507f of the first shutter 507 is in contact with the surface 41 g of the second shutter 41. The rib 507f of the first shutter 507 is pushed by the surface 41g of the second shutter 41, and the first shutter 507 rotates together with the second shutter 41 in the direction of arrow z1 about the rotation axis z. The gap δ2 in the state of FIG. 40 (c) is wider than the gap δ2 in the state of FIG. 40 (b). Further, the end portion 505a of the second sheet 505 is configured to come into contact with the surface 507h of the first shutter 507 without falling off from the surface 507h. When the second shutter 41 is further rotated in the direction of arrow z1 about the rotation axis z from the state shown in FIG. 40 (c), the result is as follows. As shown in FIG. 40 (d), the gap δ2 formed by the surface 507g of the first shutter 507 and the surface 41h of the second shutter 41 is located below the downstream opening 501b of the replenishment base 501. At this time, since the end portion 505a of the second sheet 505 is in contact with the surface 507h of the first shutter 507, the structure is such that the intrusion of toner into the gap δ2 is suppressed.

When the second shutter 41 is further rotated in the direction of arrow z1 about the rotation axis z from the state of FIG. 40 (d), the state of FIG. 40 (e) is obtained. The state of FIG. 40 (e) is a state in which the supply port 32a and the downstream opening 501b are exposed from the first shutter 507 and the second shutter 41, respectively. The toner contained in the pouch 503 (not shown) passes through the opening 503a of the pouch 503, the upstream opening 501a of the replenishment base 501, the pipe portion 501c, the downstream opening 501b, and the opening 504a of the second seal 504. Is supplied to the developing container 32. The discharged toner is received in the developing container 32 through the first through hole 507a of the first shutter 507, the hole 506a of the first seal 506, and the replenishment port 32a of the developing container 32. In the state of FIG. 40 (e), the second seal 504 has a configuration that suppresses the intrusion of toner into the interface with the first shutter 507. Further, the first seal 506 is also configured to suppress the intrusion of toner into the interface with the first shutter 507.

Next, a method of removing the toner pouch 40 from the developing container 32 after completing the toner supply (supply) from the toner pouch 40 to the developing container 32 will be described with reference to the drawings. FIG. 40 (f) shows a state in which the second shutter 41 is rotated by an angle θ3 (0 <θ3) in the direction of arrow z2 about the rotation axis z from the state shown in FIG. 40 (e). The gap δ2 that existed in the state of FIG. 40 (e) disappears, and the surface 507g of the first shutter 507 is in contact with the surface 41h of the second shutter 41. The gap δ1 in FIG. 40 (f) is wider than the gap δ1 in FIG. 40 (e).

The surface 507g of the first shutter 507 receives a pressing force from the surface 41h of the second shutter 41, and the first shutter 507 rotates together with the second shutter 41 in the direction of arrow z2 about the rotation axis z. The surface 507g of the first shutter 507 functions as an engaged portion, and the surface 41h of the second shutter 41 functions as an engaging portion that engages with the surface 507g. When the first shutter 507 and the second shutter 41 are rotated in the direction of arrow z2 from the state of FIG. 40 (f), as shown in FIG. 40 (g), the replenishment port 32a and the replenishment base 501 of the developing container 32 are shown. The downstream opening 501b is shielded. The first through hole 507a of the first shutter 507 is a part of the toner path when supplying toner from the toner pouch 40 to the developing container 32 in the state shown in FIG. 40 (e). 1 Toner may adhere to and remain on the inner wall of the through hole 507a. Therefore, the first seal 509 is configured to suppress the intrusion of toner into the interface between the first through hole 507a and the first seal 509 and the first shutter 507.

In this state, the toner pouch 40 can be separated from the developing container 32, and the state returned to the state shown in FIG. 40 (a).

[About the joint between the toner pouch 40 and the developing container 32]
As described above, the toner pouch 40 and the developing container 32 are engaged with the two-way taking hole 501h of the replenishment base 501 of the toner pouch 40 and the two-way taking shaft portion 32e of the shaft portion 322 provided in the developing container 32. It is a structure that joins each other by combining. The details will be described below with reference to the figures. FIG. 41 is a perspective view showing the two-way shaft portion 32e of the developing container 32 and its peripheral portion. The two-way shaft portion 32e has planes 32e1 and 32e2 and outer peripheral surfaces 32e3 and 32e4. The planes 32e1 and 32e2 are planes extending in the direction of the rotation axis z and are parallel to each other and facing each other. The outer peripheral surfaces 32e3 and 32e4 are a part of a cylindrical surface having the same outer diameter and provided coaxially with the rotation axis z and facing each other. FIG. 41 (a) is a perspective view in which the plane 32e1 of the two-way shaft portion 32e faces the front. FIG. 41 (b) is a perspective view in which the cylindrical surface 32e3 of the two-way shaft portion 32e faces the front.

The two-way hole 501h of the supply base 501 shown in FIG. 30 has a flat surface 501h1 and a flat surface 501h2, and an inner peripheral surface 501h3 and 501h4. The plane 501h1 and the plane 501h2 are planes extending in the direction of the rotation axis z and are parallel to each other and facing each other. The inner peripheral surfaces 501h3 and 501h4 are a part of a cylindrical surface having the same inner diameter and provided coaxially with the rotation axis z and facing each other.

When the toner pouch 40 is mounted on the developing container 32, the planes 32e1 and 32e2 of the two-way shaft portion 32e face the planes 501h1 and 501h2 of the two-way holes 501h of the replenishment base 501, respectively. On the other hand, the outer peripheral surfaces 32e3 and 32e4 of the two-way shaft portion 32e face the inner peripheral surfaces 501h3 and the flat surface 501h4 of the two-way holes 501h of the supply base 501 shown in FIG. 30, respectively.

The difference between the distance between the plane 501h1 and the plane 502h2 and the distance between the plane 32e1 and the plane 32e2 is the inner diameter of the inner peripheral surface 501h3 (501h4) and the outer diameter of the outer peripheral surface 32e3 (32e4). Is smaller than the difference of. Therefore, when the toner pouch 40 is mounted on the developing container 32, the toner pouch 40 has a configuration in which the arrow β direction shown in FIG. 41 (b) is less likely to tilt than the arrow α direction shown in FIG. 41 (a). There is.

The joint portion between the toner pouch 40 and the developing container 32 is not limited to the configuration of this embodiment, and may have the following configuration. One of the engaged portion of the toner pouch 40 and the engaging portion of the developing container 32 is a shaft portion, and the other is a hole portion. When the shaft and the hole are viewed in the direction of the rotation axis z, the direction orthogonal to the rotation axis z is the first direction, the direction orthogonal to the first direction is the second direction, and then the axis in the first direction. The structure may be such that the gap between the holes is larger than the gap between the shaft and the hole in the second direction.

As shown in FIG. 33B, the two downstream openings 501b (opening 504a of the second seal 504) of the replenishment base 501 of the toner pouch 40 are the flat surface 501h1 and the flat surface of the two-way hole 501h of the replenishment base 501, respectively. It is provided at a position facing 501h2. Further, as shown in FIG. 34 (b), the two supply ports 32a of the developing container 32 are provided at positions facing the flat surface 32e1 and the flat surface 32e2 of the two-way shaft portion 32e of the developing container 32, respectively. The reason why the two downstream openings 501b of the replenishment base 501 of the toner pouch 40 and the two replenishment ports 32a of the developing container 32 are arranged as described above will be described.

In order to suppress toner stains at the joint portion between the toner pouch 40 and the developing container 32, the following is preferable. When the first shutter 507 and the second shutter 41 are in the positions where the supply port 32a and the downstream opening 501b are opened, respectively, in the thickness direction (direction of the rotation axis z) of the second seal 504 provided with the opening 504a. The amount of deformation is maintained within a predetermined range. Thereby, it is preferable to stabilize the contact pressure between the sliding surface 504b of the second seal 504 of the supply base 501 and the first shutter 507. If the two openings 504a of the second seal 504 are arranged in a direction in which the inclination of the toner pouch 40 increases when the toner pouch 40 is mounted on the developing container 32, there is the following problem. When the toner pouch 40 is tilted, the amount of deformation of the second seal 504 in the vicinity of one opening 504a is large, but the amount of deformation of the second seal 504 in the vicinity of the other opening 504a is small. As a result, toner stains are likely to occur in the vicinity of the other opening 504a.

Therefore, in this embodiment, as shown in FIG. 41 (b), the two openings 504a of the second seal 504 (the downstream opening 501b of the replenishment base 501) in the direction of the arrow β in which the inclination of the toner pouch 40 is suppressed). Is provided. As a result, toner stains between the toner pouch 40 and the developing container 32 can be suppressed.

In the present embodiment, the supply base 501 is provided with two downstream openings 501b, but the present invention is not limited to this. As shown in FIG. 42, the number of downstream openings 501b may be one, or may be three or more. In this case, the number of replenishment ports 32a and the like of the developing container 32 also corresponds to the form on the toner pouch side.

[Modification example]
FIG. 43 is a cross-sectional view perpendicular to the direction of the rotation axis z, showing a state in which the toner pouch 40 and the developing container 32 are coupled. 43 (a) and 43 (b) are cross-sectional views of Example 1 and a modified example, respectively. In the modified example, the position of the engaging region g in which the two-way shaft portion 32e of the developing container 32 and the two-way hole 501h of the toner pouch 40 are engaged in the direction of the rotation axis z is different from that of the first embodiment. In the modified example, as shown in FIG. 43B, the second seal 504 and the first shutter 507 are in contact with each other in the engaging region g in the rotation axis z direction.

After mounting the toner pouch 40 on the developing container 32, even if the toner pouch 40 is tilted in the arrow α direction and the arrow β direction shown in FIG. 41 with respect to the developing container 32, the deformation of the second seal 504 in the direction of the rotation axis z The effect on the amount can be made smaller than that in Example 1.

(Discharge port of developing container 32)
FIG. 44 is a schematic cross-sectional view showing a state in which the toner pouch 40 is mounted on the developing container 32. FIG. 44A shows a state before the developing container 32 and the toner pouch 40 are combined. FIG. 44B shows a state before the toner pouch 40 is mounted on the developing container 32 and the second shutter 41 and the first shutter 507 of the toner pouch 40 are rotated. The position of the first shutter 507 at this time is set as the second position. In this state, the replenishment port 32a and the downstream opening 501b of the replenishment base 501 are shielded by the first shutter 507 and the second shutter 41, respectively, and the toner contained in the pouch 503 is not supplied to the developing container 32.

FIG. 44 (c) shows a state in which the second shutter 41 is rotated by 60 ° in the direction of arrow z1 about the rotation axis z from the state shown in FIG. 44 (b), and the supply port 32a and the downstream opening 501b are open. It shows the state that is being done. The position of the first shutter 507 at this time is set as the first position. The toner contained in the pouch 503 (not shown) passes through the opening 503a of the pouch 503, the upstream opening 501a of the replenishment base 501, the pipe portion 501c, the downstream opening 501b, and the opening 504a of the second seal 504. It is supplied from 40 to the developing container 32. The toner supplied from the toner pouch 40 is replenished into the developing container 32 via the first through hole 507a of the first shutter 507, the supply port 506a of the first seal 506, and the replenishment port 32a.

The developing container 32 has a supply port 32a and a discharge port 32c. When the toner pouch 40 is mounted on the developing container 32 and viewed in the direction of the rotation axis z, the supply port 32a is in a position where it overlaps with the downstream opening 501b of the toner pouch 40, but the discharge port 32c is on the downstream side. It is provided at a position that does not overlap with the opening 501b.

Here, consider a case where toner is supplied from the toner pouch 40 to the developing container 32 and the toner in the developing container 32 is full. In FIG. 44 (c), toner is supplied from the toner pouch 40 to the developing container 32, and the toner in the developing container 32 and the toner supplied from the toner pouch 40 are connected to each other. The supply port 32a of the developing container 32 is formed by a cylindrical rib 32h extending toward the inside of the developing container 32. The rib 32h may be a wall forming the supply port 33a, and does not necessarily have to be cylindrical. The toner supplied from the toner pouch 40 moves into the developing container 32 from the replenishment port 32a, and is deposited in a divergent state downward from the rib 32h of the developing container 32 as shown in FIG. 44 (c). In this state, even if the pouch 503 of the toner pouch 40 is deformed, the toner is stacked so as to be continuous, so that a powder pressure of the toner is generated, and as a result, all the toner in the toner pouch 40 is transferred to the developing container 32. It cannot be supplied, and toner remains in the pouch 503.

FIG. 44 (d) shows a state in which the second shutter 41 is rotated by an angle θ4 (0 <θ4 <60 °) in the direction of arrow z2 about the rotation axis z from the state shown in FIG. 44 (c). When the first shutter 507 is rotated in a state where the toner in the pouch 503 is stacked so as to be connected to the toner in the developing container 32, the result is as follows. As shown in FIG. 44 (c), the first through hole 507a of the first shutter 507 and the toner existing inside (the toner existing in the region TA in the drawing) are worn away and move together with the first shutter 507. In FIG. 44 (d), the discharge port 506c of the first seal 506 and the discharge port 32c of the developing container 32 are provided below the first through hole 507a of the developing side shutter 507 in the vertical direction. The position of the first shutter 507 at this time is set as the third position. The toner present in the first through hole 507a and frayed due to the movement of the first shutter 507 passes through the discharge port 506c of the first seal 506 and the discharge port 32c of the developing container 32, and is used in the developing container 32. It is configured to fall inside. Further, the lower end of the wall portion forming the discharge port 32c of the developing container 32 is configured to be located above the lower end of the rib 32h in the vertical direction. This is because the toner that has been deposited in a divergent state below the rib 32h is avoided, and the toner is dropped onto the space portion in the developing container 32.

FIG. 44 (e) shows a state in which the second shutter 41 is rotated by 60 ° in the arrow z2 direction about the rotation axis z from the state shown in FIG. 44 (d). The position of the first shutter 507 at this time is the same second position as in FIG. 44 (b). The replenishment port 32a of the developing container 32 and the downstream opening 501b of the replenishment base 501 are shielded. That is, the third position of the first shutter 507 is between the first position and the second position.

As described above, even when the opening and closing operation of the first shutter 507 is repeated with the supply port for supplying toner from the toner pouch 40 to the developing container 32 filled with toner, the toner is dirty and the toner is not covered. Leakage can be suppressed.

(Reinforcement of pouch)
FIG. 45 shows another embodiment of the joint between the pouch 503 of the toner pouch 40 and the replenishment base 501.

The replenishment base 501 is provided with reinforcing ribs 501k that sandwich and reinforce the pouch 503. The replenishment base 501 is attached so that the upstream opening 501a and the pouch opening 503a communicate with each other at the longitudinal end of the pouch 503 on the side where the pouch opening 503a is provided. The replenishment base 501 is provided with two reinforcing ribs 501k as support portions that sandwich and support one end portion in a direction orthogonal to the longitudinal direction of the pouch 503 over the longitudinal direction of the pouch 503. In the direction orthogonal to the longitudinal direction of the pouch 503, the first support portion and the two reinforcing ribs 501k as the second support portion are provided on opposite sides of the upstream opening 501a. The reinforcing rib 501k preferably extends to the longitudinal center of the pouch 503 in the longitudinal direction of the pouch 503. The pouch 503 is made of a resin sheet such as PE or a composite material thereof, and is in a form that can be easily deformed by the user. On the other hand, in order to securely connect the pouch 503 and the supply base 501 and to make the pouch self-supporting, the pouch 503 is reinforced (supported) by the reinforcing rib 501k.
The reinforcing rib 501k may be configured to support the pouch 503 by being adhered to the pouch 503 without sandwiching the pouch 503.

<First modification>
FIG. 19A shows a first modification of the first embodiment. As shown in FIG. 19A, in the image forming apparatus 1B, the replenishment port 132a of the developing container is arranged on the right side of the apparatus, and the opening / closing member 83B is also arranged on the right side of the apparatus. The opening / closing member 83B exposes the supply port 132a in the open state and covers the supply port 132a in the closed state. By arranging the replenishment port 132a on the right side of the device in this way, the replenishment port 132a comes close to the toner remaining amount panel 400. Therefore, when the toner pouch 40 is used to replenish the developing container with toner, the toner remaining amount panel 400 can be easily confirmed.

<Second modification>
Further, the present invention is not limited to the form shown in FIG. 19A, and the present invention may be applied to the image forming apparatus 1C configured to open the opening / closing member 83C toward the front side as shown in FIG. 19B. ..

<Third modification example>
Further, as shown in FIG. 19C, the present invention may be applied to an image forming apparatus 1D configured to open the opening / closing member 83D to the back side.

<Fourth modification>
Further, as shown in FIG. 20A, the operation unit 300E may be arranged not on the printer main body 100 but on the reading device 200, or may be arranged on the right side of the device together with the toner remaining amount panel 400. Of course, both the operation unit 300E and the toner remaining amount panel 400 may be arranged on the right side of the device.

<Fifth modification>
Further, as shown in FIG. 20B, the toner remaining amount panel 400F may be arranged on the left side of the device, and the operation unit 300F may be arranged on the right side of the device.

<Second Embodiment>
Next, the second embodiment of the present invention will be described, but the second embodiment is a modification of the configuration of the supply port 32a of the first embodiment. Therefore, the same configuration as that of the first embodiment will be described by omitting the illustration or adding the same reference numerals to the drawings.

As shown in FIG. 21A, in the image forming apparatus 1G, the opening / closing member 83G is supported on the top cover 82 so as to be openable / closable, and the opening / closing member 83G is configured to open to the back side of the apparatus. By opening the opening / closing member 83G, the supply port 232a of the developing container 32G is exposed. The supply port 232a is open downstream and upward in the discharge direction of the discharge roller pair 80 so as to be inclined with respect to the vertical direction. In other words, the supply port 232a is obliquely forward and upward. It is open.

By configuring the supply port 232a in this way, the toner pouch 40 is in a state of being inclined toward the front while being attached to the supply port 232a. Therefore, the space between the replenishment port 232a and the reading device 200 can be effectively utilized, and a large-capacity toner pouch can also be attached to the replenishment port 232a.

As shown in FIGS. 22A and 22B, the opening / closing member 83H and the reading device 200 may be configured to be held at a shallower angle than those in FIGS. 21A and 21B. With this configuration, the installation space of the image forming apparatus 1 can be saved.

<Third embodiment>
Next, the third embodiment of the present invention will be described. The third embodiment is a modification of the configuration of the cartridge guide 102 of the first embodiment. Therefore, the same configuration as that of the first embodiment will be described by omitting the illustration or adding the same reference numerals to the drawings.

As shown in FIGS. 23A and 23B, the image forming apparatus 1J has a printer main body 100J and a reading device 200, and the printer main body 100J has a cartridge guide 102J. The cartridge guide 102J guides the process cartridge 20 when the process cartridge 20 is pulled out by sliding on the protruding portion 21a (see FIG. 5A) provided at the end of the photosensitive drum 21 in the axial direction.

A retaining 102Ja is formed at the downstream end of the cartridge guide 102J in the drawing direction. Therefore, as shown in FIG. 23B, when the user pulls out the process cartridge 20, the protruding portion 21a of the process cartridge 20 hits the retaining 102Ja, and the process cartridge 20 is not removed from the printer main body 100J. A rotation stopper (not shown) is provided in the vicinity of the retaining stopper 102Ja, and the process cartridge 20 is held in contact with the retaining stopper 102J without being rotated by the rotation stopper.

In this way, when the process cartridge 20 is pulled out along the cartridge guide 102J, the supply port 32a is located on the front side of the image forming apparatus 1J as shown in FIGS. 24 and 25 (a) and 25 (b). ing. Therefore, the toner replenishment operation of replenishing the toner from the replenishment port 32a to the developing container 32 by using the toner pouch 40 can be easily performed. Further, since a large space exists directly above the supply port 32a, a large-capacity toner pouch can be attached to the supply port 32a. In addition, any of the above-described embodiments and modifications may be combined as appropriate.

In any of the above-described forms, the reading device 200 is provided above the printer main body, but the present invention is not limited to this. That is, the image forming apparatus may be a printer that does not have a reading apparatus. Further, the reading device may be a reading device provided with an ADF (Auto Ducument Feeder) for feeding the original.

1 Image forming device 12 Transfer means (transfer roller)
21 Image carrier (photosensitive drum)
31 Developer carrier 32 Developing container 32a Supply port 34 Stirring member 36 Storage unit (conveyor chamber)
40 Replenishment container (toner pouch)
83 Opening and closing member 90 Control means (control unit)
100 Printer body 300 Operation unit M1 Drive source (motor)

Claims (3)

In an image forming apparatus in which a toner container for storing toner and having a supply port for supplying toner can be attached and detached.
A shutter that has a through hole and a shielding part and is configured to be rotatable around the rotation axis,
It is a toner accommodating portion configured so that the toner container can be mounted, and is provided at a position overlapping with the supply port so that toner from the toner container can be received when viewed in the direction of the rotation axis. A toner accommodating portion that has an inlet and an outlet provided at a position that does not overlap with the supply port, and accommodates toner that has fallen from the inlet and the outlet.
Have,
The shutter has a first position where the through hole overlaps with the receiving port so that the toner of the toner container is supplied to the toner accommodating portion when viewed in the direction of the rotation axis, and the toner container. The shield is configured to rotate between a second position that overlaps the inlet so that the toner is not supplied to the toner accommodating portion.
The shutter is characterized in that while rotating from the first position to the second position, the through hole passes through a third position where the through hole overlaps with the discharge port when viewed in the direction of the rotation axis. Image forming device. The image forming apparatus according to claim 1, wherein the lower end of the wall forming the discharge port is above the lower end of the wall forming the through hole in the vertical direction. When the shutter is a first shutter, the toner container has a second shutter having an engaged portion.
According to claim 1 or 2, the first shutter has an engaging portion configured to engage with the engaged portion of the second shutter so as to rotate with the second shutter. The image forming apparatus described.

Images