The present invention relates to a toner container in which toner is accommodated and an image forming apparatus for forming an image on a recording material.
In an image forming apparatus of an electrophotographic type, a toner cartridge (toner container) which accommodates toner used as a developer in an electrophotographic process and which is detachably mountable to a main assembly of the image forming apparatus is used. In Japanese Laid-Open Patent Application Nos. Hei 5-107918, 2008-158348, and 2011-075887, a toner cartridge (toner container) including a toner accommodating portion for accommodating the toner for being supplied to a developer carrying image and a residual toner (waste toner) accommodating portion for collecting residual toner (waste toner) is disclosed.
According to an aspect of the present invention, there is provided a toner container comprising: a first chamber configured to accommodate toner and provided with an outlet port through which the toner is discharged outside of the toner container; a second chamber provided with an inlet port and configured to accommodate toner to be received from an outside of the toner container through the inlet port; a stirring member configured to stir the toner accommodated in the first chamber and to rotate about a rotational axis; and an air supply unit configured to supply air for discharging the toner accommodated in the first chamber to an outside of the toner container through the outlet port, wherein the air supply unit, the first chamber, and the second chamber are aligned in this order in a direction of the rotational axis.
Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings.
Parts (a) and (b) of
Parts (a) and (b) of
Parts (a) and (b) of
Parts (a) to (c) of
Parts (a) and (b) of
In the following, an apparatus according to the present invention will be described while making reference to the drawings.
In the following description, an “image forming apparatus” is an apparatus for forming an image on a recording material (recording medium) with toner as a developer.
A sheet used as the recording material includes paper such as plain paper or thick paper, a plastic film such as a sheet for an overhead projection, a special-shaped sheet such as an envelope or index paper, and a cloth.
The printer main body A includes a sheet feeding portion 103, a transfer roller 104, a fixing device 105, and a laser scanner 101. The process cartridge B is provided detachably mountable to the printer main body A. The process cartridge B is prepared by integrally assembly an image bearing member and process means actable on the image bearing member into a unit and is mounted in an image forming apparatus main assembly so as to be removable from the image forming apparatus main assembly. The toner container accommodates the toner as the developer and is mounted in the apparatus main assembly so as to be removable from the apparatus main assembly. The printer main body A can be said as a portion in which the process cartridge B and the toner container C are removed from the printer 1.
The process cartridge B will be described using
As shown in
The cleaning unit 10 includes the photosensitive drum 11 (photosensitive drum assembly), a cleaning blade 17 as a cleaning member for the photosensitive drum 11, and a charging roller 12 as a charging member. Further, the cleaning unit 10 includes a charging roller cleaner 14 as a cleaning member for the charging roller 12, a residual toner primary accommodating portion 10a, a first residual toner conveying passage 10b, and the second residual toner conveying passage 10c.
The photosensitive drum 11 is one in which a photosensitive layer is formed of an organic photosensitive member or the like on an outer peripheral side of a support formed in a cylindrical shape (drum shape). The charging roller 12 is provided so as to contact an outer peripheral surface of the photosensitive drum 11. The charging roller 12 electrically charges the photosensitive drum 11 by voltage application from a high-voltage substrate provided in the printer main body A. The charging roller 12 is rotated by the photosensitive drum 11 (i.e., is rotated by following rotation of the photosensitive drum 11).
The cleaning blade 17 is an elastic member provided so as to contact the outer peripheral surface of the photosensitive drum 11. The cleaning blade 17 elastically contacts the photosensitive drum 11 at a free end thereof, and removes residual toner (waste toner) described later from the photosensitive drum 11. The residual toner removed by the cleaning blade 17 is conveyed from the residual toner primary accommodating portion 10a to the toner container C through the first residual toner conveying passage 10b and the second residual toner conveying passage 10c.
As shown in
The developing roller 16 supplies the toner to a developing region (region where the photosensitive drum 11 opposes the developing roller 16. In the developing region, the developing roller develops an electrostatic latent image formed on the photosensitive drum 11.
The developing blade 18 regulates an amount (layer thickness) of the toner deposited on a peripheral surface of the developing roller 16 in contact with the peripheral surface of the developing roller 16. Further, the developing blade 18 triboelectrically charges the toner deposited on the peripheral surface of the developing roller 16 by rubbing the toner, so that an electric charge is imparted to toner particles.
In the developer accommodating chamber 152, a stirring member 154 is provided. The toner accommodated in the developer accommodating chamber 152 is sent to the developing chamber 151 while being stirred by rotation of the stirring member 154 and is supplied to the developing roller 16. Incidentally, in the developing chamber 151, an application roller for applying the toner in the developing chamber 151 onto the developing roller 16 can be disposed.
A toner amount in the developer accommodating chamber 152 is detected by an unshown residual amount detecting means. A controller of the printer main body A executes an operation, on the basis of a detection signal of the residual amount detecting means, for supplying the toner from the toner container C to the process cartridge B in the case where the toner amount in the developer accommodating chamber 152 is a certain amount or less.
The receiving chamber 153 is configured to receive the toner from the toner container C through a passage provided in the cleaning unit 10. Specifically, a stay 21 constituting a part of the cleaning unit 10 is provided with a supply port 21c for receiving the toner from the toner container C and a delivery portion 21d for delivering the toner to the receiving chamber 153 of the developing unit 15.
Then, an operation of the printer 1 will be described using
On the other hand, in parallel to preparation of such a toner image, the sheet feeding portion 103 conveys sheets S one by one. Specifically, a feeding roller 103a rotates and feeds the sheets S, stacked on a feeding tray, one by one. Thereafter, the sheet S is conveyed to the transfer portion. Then, during passing of the sheet S through the transfer portion, by a transfer roller 104 to which a transfer voltage is applied from a high-voltage substrate, the toner image is transferred from the photosensitive drum 11 onto the sheet S. Incidentally, toner (residual toner) remaining on the surface of the photosensitive drum 11 without being transferred from the photosensitive drum 11 onto the sheet S in the transfer portion is removed from the surface of the photosensitive drum 11 by the cleaning blade 17.
The sheet S on which the toner image is transferred is conveyed to the fixing device 105. The fixing device 105 is of a heat-fixing type, and heats and presses the toner image on the sheet S while nipping and conveying the nip of a rotatable member pair. By this, an image fixed on the sheet S is obtained. In the case of one-side printing, the sheet S passed through the fixing device 105 is discharged to an outside of the printer main body A by a discharging roller pair as a discharging means and is stacked on a discharge tray 106 provided at an upper surface of the printer main body A. In the case of double-side printing, the sheet S on which first side the image is formed by passing through the transfer portion and the fixing device 105 is reversed by the discharging roller pair also functioning as a reversing means, and then is conveyed again toward the transfer portion through a re-conveying passage. Then, the sheet S on which second side an image is formed by passing through the transfer portion and the fixing device 105 at a second time is discharged to the outside of the printer main body A by the discharging roller pair and is stacked on the discharge tray 106 provided at the upper surface of the printer main body A.
A structure of the process cartridge B in this embodiment will be described specifically using
As shown in parts (a) and (b) of
A frame of the cleaning unit 10 is constituted by a main frame 20, a stay 21, and a side cover 7. The main frame 20 supports the cleaning blade 17, the charging roller 12, and the charging roller cleaner 14. The photosensitive drum 11 is rotatably supported by a drum pin 22 mounted on the main frame 20 on one side and by a photosensitive drum supporting portion 7b provided in the side cover 7 on an opposite side.
A structure in which the developing unit 15 is supported by the cleaning unit 10 will be specifically described. As shown in part (a) of
The developing unit 15 is movable about the swing axis 8 between a contact position where the developing roller 16 contacts the photosensitive drum 11 and a separated position where the developing roller 16 is separated from the photosensitive drum 11. In the following, a state of the process cartridge B when the developing unit 15 is in the contact position is referred to as a “development contact state”, and a state of the process cartridge B when the developing unit 15 is in the separated position is referred to as a “development separation state”.
The process cartridge B includes pressing springs 19a and 19b as elastic members for urging the developing unit 15. The pressing springs 19a and 19b are spring members (tension springs) connecting the developing unit 15 and the cleaning unit 10 to each other. The developing unit 15 is urged toward the contact position by the pressing springs 19a and 19b.
Further, the printer A includes a separating mechanism 100 described later as an actuator for moving the developing unit 15 to the contact position and the separated position. A pressing member 100a is capable of moving the developing unit 15 between a position where the pressing member 100a holds the developing unit in the contact position and a position where the pressing member 100a permits movement of the developing unit 15 from the contact position to the separated position. That is, the separating mechanism 100 is capable of moving the developing unit 15 from the contact position to the separated position against an urging force of the pressing springs 19a and 19b.
An operation for moving the developing unit 15 between the contact position and the separated position will be described using parts (a) and (b) of
As shown in part (a) of
As shown in part (b) of
When the pressing member 100a returns to an original position (part (a) of
Thus, a constitution in which the process cartridge B is capable of being switched in state between the development contact state and the development separation state was employed. For this reason, for example, during the non-image formation, the process cartridge B is put in the development separation state, so that it is possible to reduce a degree of deterioration of the toner and to suppress unnecessary toner consumption during the non-image formation.
The toner container C will be described using
As shown in
A vertical direction (vertically upward direction) in a state in which the toner container C and the process cartridge B are mounted in the printer main body A and in which the printer main body A is installed on the horizontal surface is indicated by an arrow Y in
A side which is one end side of the toner container C with respect to the longitudinal direction and on which principally a driving force is inputted from the printer main body A to the toner container C is referred to as a driving side (left side of
As shown in
The toner supplying portion 30 includes a toner accommodating portion 30a for accommodating the toner as shown in
In the toner accommodating portion 30a, a supplying screw 35 as a screw portion for conveying the toner toward the toner outlet port 31a and a stirring and conveying unit 36 as a stirring member for stirring the toner are provided. The stirring and conveying unit 36 in this embodiment is a stirring to and conveying member for stirring and conveying the toner toward the supplying screw 35 by being rotated.
Each of the supplying screw 35 and the stirring and conveying unit 36 conveys and stirs the toner by being rotated about its rotational axis extending in the longitudinal direction. That is, each of the supplying screw 35 and the stirring and conveying unit 36 is an example of a toner conveying means (first toner conveying means) for conveying the toner. The stirring and conveying unit 36 includes a shaft portion 36a (see also
As shown in parts (a) and (b) of
The pump 37a has a cylindrical outer configuration, and a cylindrical side surface portion thereof is formed in a bellows-like shape.
Accordingly, the pump 37a is capable of being expanded and contracted in a direction long a center axis of the cylindrical-shaped portion. The cam 37b and the link arm 37c constitute a cam mechanism for driving the pump 37a for converting a rotational driving force inputted to the toner container C into translatory (rectilinear) motion (expanding and contracting motion) in a contraction direction of the pump 37a and an expansion direction opposite to the contraction direction. Incidentally, the contraction direction of the pump unit 37 is a direction substantially parallel to the longitudinal direction of the toner container C (i.e., substantially parallel to the arrow Z), and is a direction from the driving side toward the non-driving side of the toner container C.
A driving constitution of the toner supplying portion 30 will be described using
The toner container C is provided with the stirring drive input portion 38 and the pump/screw drive input portion 39 separately from each other, so that the stirring and conveying unit 36, the pump unit 37, and the supplying screw 35 can be drive-controlled independently. Specifically, the stirring and conveying unit 36 is continuously driven during the image formation, while the pump unit 37 and the supplying screw 35 can be driven intermittently only at a timing when the supply of the toner to the process cartridge B is needed. The timing when the supply of the toner to the process cartridge B is needed is discriminated by a controller of the printer main body A on the basis of a detection signal of the above-described remaining amount detecting means.
As viewed in the longitudinal direction, adjacent to the stirring drive input portion 38, a stirring driving-side gear 38b for transmitting the rotational driving force to the stirring and conveying unit 36 is disposed. The stirring driving-side gear 38b is provided coaxially with the stirring and conveying unit 36 on one end side with respect to the longitudinal direction, and is rotated integrally with the stirring and conveying unit 36. The stirring driving-side gear 38b rotates the stirring and conveying unit 36 in the R1 direction of
As viewed in the longitudinal direction, adjacent to the pump/screw drive input portion 39, a cam driving gear 39a rotated by receiving a driving force from the pump/screw drive input portion 39 is provided. Adjacent to the cam driving gear 39a, a cam gear 39b rotated by receiving the driving force from the cam driving gear 39a is provided. The cam gear 39b is formed integrally with a cam 37b. For that reason, the cam gear 39b is rotated with rotation of the pump screw drive input portion 39, whereby the cam 37b of the pump unit 37 is rotated. Then, by the rotation of the cam 37b, the link arm 37c moves rectilinearly in the longitudinal direction, so that the pump 37a is expanded and contracted.
As viewed in the longitudinal direction, adjacent to the cam gear 39b, a screw driving gear 39c for transmitting a rotational driving force to the supplying screw 35 is provided. The screw gear 39c is provided coaxially with the supplying screw 35 on one end side with respect to the longitudinal direction, and is rotated integrally with the supplying screw 35. The screw driving gear 39c rotates the supplying screw 35 by receiving the driving force from the cam gear 39b. By rotation of the supplying screw 35, the toner in the toner accommodating portion 30a is conveyed toward the toner outlet port 31a in the longitudinal direction.
As shown in
Further, the driving-side side cover 50 is provided with a positioning boss 50a and a portion-to-be-guided 50b. These members have a function of regulating an attitude of the toner container C when the toner container C is mounted in the printer main body A as described later.
Next, an outline of the residual toner collecting portion 40 will be described. As shown in
As shown in parts (a) and (b) of
To the residual toner accommodating portion 40a, drive is transmitted in the following manner. As shown in parts (a) and (b) of
As viewed in the longitudinal direction, adjacent to the stirring non-driving-side gear 38a, a gear train 710 for transmitting drive to the first residual toner screw 44 in the residual toner accommodating portion 40a. That is, the first residual toner screw 44 is rotated by receiving the driving force from the printer main body A via the stirring drive input portion 38, the stirring driving-side gear 38b, the stirring and conveying unit 36, the stirring non-driving-side gear 38a, and the gear train 710.
As shown in
Further, the non-driving-side side cover 60 is provided with a positioning boss 60a and a portion-to-be-guided 60b. These members have a function of regulating an attitude of the toner container C when the toner container C is mounted in the printer main body A as described later.
An arrangement of the pump unit 37, the toner supplying portion 30, and the residual toner collecting portion 40 in the longitudinal direction will be described using
As shown in
The toner supplying portion 30 is disposed inside the pump unit 37 with respect to the longitudinal direction. That is, the toner supplying portion is disposed on a side (non-driving side) upstream of the pump unit 37 with respect to the arrow Z direction. Further, the residual toner collecting portion 40 is disposed on a side (non-driving side) upstream of the toner supplying portion with respect to the arrow Z direction. In other words, with respect to the longitudinal direction of the toner container C, i.e., with respect to a rotational axis direction P1 of the stirring and conveying unit 36 (stirring member), the pump 37a, the toner accommodating portion 30a, and the residual toner accommodating portion 40a are arranged in a named order. Further, in other words, the pump 37a, the toner accommodating portion 30a, and the residual toner accommodating portion 40a are aligned in this order in the rotational axis direction P1 of the stirring and conveying unit 36 (stirring member). The rotational axis direction P1 is a direction from the driving side toward the non-driving side of the toner container C along a rotational axis A36 (
For this reason, compared with the case where with respect to the rotational axis direction P1 (longitudinal direction of the toner container C), the pump unit 37, the residual toner accommodating portion 40a, and the toner accommodating portion 30a are arranged in this order, it becomes possible to realize efficient toner discharge with the air. That is, in this embodiment, when an air conveying force during the contraction of the pump 37a is transmitted to the toner outlet port 31a, there is no need that the air passes toner the position of the residual toner accommodating portion 40a, and therefore, an air conveying distance can be suppressed to a short distance, so that it becomes possible to convey the air at high efficiency.
Further, compared with the case where with respect to the rotational axis direction P1, the toner accommodating portion 30a, the pump unit 37, and the residual toner accommodating portion 40a are arranged in this order, when the driving force is transmitted form the printer main body A to the pump 37a, in this embodiment, there is no need that the driving force is transmitted through the toner accommodating portion 30. Therefore, in this embodiment, an additional gear train for transmitting the drive from the toner accommodating portion 30a to the pump 37a is not needed, and therefore, it becomes possible to improve drive transmission efficiency from the printer main body A to the pump 37a in entirety of a drive transmitting system.
Incidentally, in the case where the toner container C is viewed in the rotational axis direction P1, the photosensitive drum 37a may preferably at least partially overlap with the toner accommodating portion 30a (
An arrangement of the toner outlet port 31a in the longitudinal direction will be described using
Here, the longitudinal center Z0 of the toner accommodating portion is an intermediate position, with respect to the rotational axis direction P1 (longitudinal direction) of the stirring and conveying unit 37, between a position Z1 of a side wall 30a1 on one side (pump side, driving side) of the toner accommodating portion 30a with respect to the longitudinal direction and a position Z2 of an inner surface of a surface wall 30a2 on the other side (residual toner accommodating portion side, non-driving side) of the toner accommodating portion 30a with respect to the longitudinal direction. The position Z1 of the side wall 30a1 can be based on a position of a peripheral portion of an opening through which the side wall 30a1 communicates with the inside space of the pump 37a. The position of the side wall 30a2 can be based on a position of a portion where the side wall 30a2 opposes the pump 37a with respect to the longitudinal direction. Accordingly, the toner outlet port 31a is disposed in a position closer to the pump 37a than to the intermediate position (Z0) between the side wall 30a2 on the residual toner accommodating portion side and the side wall 30a1 on the pump side of the toner accommodating portion 30a with respect to the rotational axis direction P1 of the stirring and conveying unit 36. That is, the outlet port of the first toner accommodating portion is disposed in a position of the first toner accommodating portion closer to the pump than to the second toner accommodating portion with respect to the rotational axis direction of the stirring member.
In order to efficiently discharge the toner through the toner outlet port 31a by the air conveying portion (positive pressure) generating during contraction of the pump 37a, it is preferable that a distance from the pump 37a to the toner accommodating portion 30a is short. In this embodiment, the toner outlet port 31a is disposed on a side closer to the pump 37a than to the longitudinal center Z0 of the toner accommodating portion 30a, so that air conveying efficiency of the pump 37a can be enhanced. However, in the case where the toner conveying force can be sufficiently obtained, the toner outlet port 31a may be disposed at the longitudinal center Z0 or on a side where the toner outlet port 31a is more distant from the pump 37a than from the longitudinal center Z0.
In this embodiment, inside the toner accommodating portion 30a, flow passages 37d and 37e for guiding the air from the pump 37a to the toner outlet port 31a are provided (
An arrangement of the pump unit 37, the toner supplying portion 30, and the residual toner collecting portion 40 in the short direction will be described using
In the main body mounting attitude of the toner container C, the center line 37a1 of the pump 37a is disposed above the toner outlet port 31a (on an upper side of the direction of gravitation), i.e., on a downstream side of the arrow Y direction. Here, the center line 37a1 is an imaginary rectilinear line extending in the expansion and contraction direction of the pump 37a and is a center axis of the pump 37a having a substantially cylindrical shape. In the case where the shape of the pump 37a is a shape (for example, polygonal pillar-like shape) other than the cylindrical shape, the center line 37a1 of the pump 37a is an imaginary rectilinear line extending in the expansion and contraction direction and is a rectilinear line passing through a center of a circle circumscribed on an outer configuration of the pump 37a as viewed in the expansion and contraction direction.
The pump 37a contracts in the longitudinal direction as described above, so that the pump 37a imparts the air conveying force to the toner outlet port 31a. At this time, during expansion of the pump 37a after the toner is conveyed, negative pressure to the pump 37a acts on the toner interposed in the toner outlet port 31a. However, the pump 37a is provided on the upper side of the toner outlet port 31a with respect to the direction of gravitation, and therefore, back-flow of the toner with rise of the toner due to the negative pressure is suppressed by the gravitation. Therefore, inside clogging of the pump 37a by the back-flow of the toner during expansion of the pump 37a can be made hard to occur, so that it becomes possible to maintain the air conveying efficiency of the pump 37a.
Further, in the main body mounting attitude of the toner container C, the toner outlet port 31a is disposed above (on the upper side of the direction of gravitation) at least a lowest potion of a bottom 30b of the toner accommodating portion 30a, i.e., on a downstream side of the arrow Y direction. As a comparison example, when the toner outlet port 31a is provided, for example, at the same height as the bottom 30b or in a position lower in height than the bottom the toner in the toner accommodating portion 30a is compressed by a self-weight thereof and a bulk density thereof fluctuates, with the result that there is a possibility that a toner discharge amount is not stabilized. On the other hand, as in this embodiment, when the toner outlet port 31a is disposed above the bottom of the toner accommodating portion 30a, it becomes possible to stabilize the toner discharge amount.
Specifically, in this embodiment, the toner supplied to the toner outlet port 31a through the supplying screw 35 is scooped upward from the bottom 30b by rotation of the stirring and conveying unit 36, and therefore, the toner is sufficiently fluidized by a stirring action of the toner. Accordingly, the pump 37a is capable of imparting the air conveying force to the toner which is sufficiently fluidized by the stirring and conveying unit 36 and which is made substantially constant in bulk density, so that the toner discharge amount is stabilized.
An arrangement of the pump/screw constitution in the longitudinal direction will be described using parts (a) and (b) of
In addition, as shown in parts (a) and (b) of
By employing the above-described constitution, it becomes possible to realize drive transmission to the screw member while suppressing the space of the main body-side driving means with respect to the longitudinal direction when the screw member receives the driving force from the printer main body A.
An arrangement of the pump/screw driving constitution in the short direction will be described using
In the main body mounting attitude of the toner container C, the center line 37a1 of the pump 37a is disposed between the pump/screw drive input portion 39 and the toner outlet port 31a with respect to the horizontal direction (arrow X). Further, the rotational axis of the screw driving gear 39c is disposed between the pump 37a and the toner outlet port 31a with respect to the horizontal direction. In other words, in the toner supplying portion 35, from the upstream side of the arrow X direction, the pump/screw drive input portion 39, the pump 37a, the screw driving gear 39c, and the toner outlet port 31a are disposed in a named order.
By employing this constitution, the pump 37a is provided in a position closer to the toner outlet port 31a than the pump screw drive portion 39 is. For this reason, compared with the case where the pump 37a is provided in a position more distant with respect to the horizontal direction of the toner container C from the toner outlet port 31a than the pump/screw input portion 39 is, the air conveying distance is suppressed to a short distance, so that it becomes possible to convey the air with high power transmitting efficiency.
Incidentally, in this embodiment, the two drive input portions 38 and 29 through which drive can be independently inputted to the toner container C, so that even when the pump/screw drive input portion 39 is not driven, the stirring drive input portion 38 can be driven. That is, even when the toner supplying portion 30 does not supply the toner to the process cartridge B, a state in which the residual toner can be collected can be maintained by driving the first residual toner screw 44 and the second residual toner screw 45 of the residual toner collecting portion 40.
Further, drive input from the printer main body A to the toner container C can be integrated on one end side (first end side with respect to the rotational axis direction P1 of the stirring member) of the toner container C with respect to the longitudinal direction, so that the gear train of the printer main body A can be simplified. In this embodiment, the driving force inputted to the stirring drive input portion 38 on one side of the toner supplying portion 30 with respect to the longitudinal direction is transmitted to the other side of the toner supplying portion 30 with respect to the longitudinal direction by using the stirring and conveying unit 36 penetrating through the frame (supplying portion frame 31) of the toner supplying portion 35. That is, the toner container C is constituted so that the driving force received on the first end side of the toner accommodating portion 30a with respect to the rotational axis direction P1 of the stirring member is transmitted to a second end side of the toner accommodating portion 30a with respect to the rotational axis direction P1 through the stirring member. By this, it becomes possible to realize drive transmission to the first residual toner screw 44 positioned on the other side of the toner supplying portion 30 with respect to the longitudinal direction.
Incidentally, there is no need that the driving constitution of the toner container C is limited to the above-described constitution. For example, a constitution in which the first residual toner screw 44 is driven by providing another gear train on the other side of the printer main body A with respect to the longitudinal direction may be employed. However, by employing the driving constitution described in this embodiment, on the other side of the printer main body A with respect to the longitudinal direction, there is no need to increase the gear train for driving the residual toner collecting portion 40. Therefore, the residual toner can be accommodated in the toner container C without upsizing the toner container C and the printer main body A with respect to the axial direction of the photosensitive drum 11, and thus is preferable.
Next, a mounting and demounting method of the process cartridge B and the toner container C relative to the printer main body A will be described using parts (a) and (b) of
As shown in part (a) of
Further, the printer main body A includes guiding portions 108 and 109.
As shown in parts (a) and (b) of
The toner container C is provided with positioning bosses 50a and 60a and portions-to-be-guided 50b and 60b as shown in parts (a) and (b) of
First, the process cartridge B is mounted in the printer main body A. As shown in part (a) of
After the process cartridge B is mounted in the printer main body A, the toner container C is mounted into the printer main body A. As shown in part (b) of
Part (c) of
When the openable door 107 is closed after the process cartridge B and the toner container C are mounted, the printer 1 is in a state in which image formation is capable of being executed.
When the toner container C and the process cartridge B are demounted (removed), the procedure is performed in a reverse order to the above-described order. That is, after the openable door 107 is opened, it is only required that first, the toner container C is pulled out in a direction opposite to the mounting direction (arrow D) and then the process cartridge B is pulled out in the direction opposite to the mounting direction (arrow D).
A residual toner conveying constitution on an inside of the cleaning unit 10 will be described using
As shown in
As described above, the residual toner on the photosensitive drum 11 is collected in the residual toner primary accommodating portion 10a by the cleaning blade 17. When the residual toner primary accommodating portion 10a is filled with the residual toner, the residual toner reaches the first residual toner conveying passage 10b. The residual toner reached the first residual toner conveying passage 10b is conveyed from one side toward the other side by a helical portion 70a provided in the first residual toner conveying member 70, and then reaches the second residual toner conveying passage 10c. The residual toner reached the second residual toner conveying passage 10c is conveyed by the helical portion 71a of the second residual toner conveying member 71 in a direction perpendicular to the drum axis direction and toward above the cleaning blade 17. Then, the residual toner conveyed to an end portion of the second residual toner conveying member 71 is discharged from a residual toner outlet port 72 (
The residual toner outlet port 72 is an opening provided in the cleaning unit 10 for permitting discharge of the residual toner from the process cartridge B. The residual toner inlet port 42a is an opening provided in the residual toner collecting portion 40 of the toner container C in order to receive the residual toner discharged from the process cartridge B.
A driving constitution of the first residual toner conveying member 70 and the second residual toner conveying member 71 will be described using
As shown in
To the bevel gear 71b, the drive is transmitted from the driving gear 70b through the idler gear 602 and a penetration (insertion) shaft 75. The penetration shaft is an axial member penetrating through the cleaning unit in a drum axis direction. At one end of the penetration shaft 75, a gear 75b engageable with the idler gear 602 is provided, and at the other end of the penetration shaft 75, a bevel gear 75a engageable with the bevel gear 71b is provided. Thus, by the drive transmission from the driving gear 70b through the idler gear 602 and the penetration shaft 75, the first residual toner conveying member 70 and the second residual toner conveying member 71 are driven in interrelation with each other, so that the residual toner can be conveyed.
Incidentally, the bevel gear 71b and the bevel gear 75a may be replaced with a screw gear or a worm gear. Further, in this embodiment, rotation numbers of the first residual toner conveying member 70 and the second residual toner conveying member 71 are the same, but in order to enhance conveying efficiency, the rotation number of the second residual toner conveying member 71 may be made more than the rotation number of the first residual toner conveying member 70.
Details of a driving constitution of the residual toner collecting portion will be described using
As shown in
The screw gear 702 functions as an input gear for inputting the driving force to the first residual toner screw 44 as a residual toner conveying means. Incidentally, the screw gear 702 is provided coaxially with the first residual toner screw 44, and therefore, is positioned below the residual toner inlet port 42a of the residual toner collecting portion 40. Further, the screw gear 702 is positioned below the stirring non-driving-side gear 38a. Thus, the driving force is transmitted by the gear train 710 to the first residual toner screw 44 disposed in a position lower than the stirring non-driving-side gear 38a and the residual toner inlet port 42a, so that the residual toner can be efficiently charged into the residual toner collecting portion 40.
Incidentally, as a drive transmitting portion, for example, a belt transmitting mechanism may be used in place of the gear train 710.
The supplying portion frame 31 is provided with a first shaft supporting portion 704 shaft-supporting the first idler gear 700 and a second shaft supporting portion 705 shaft-supporting the second idler gear 701. The accommodating portion frame 41 is provided with a third shaft supporting portion 706 shaft-supporting the first idler gear 700 and a fourth shaft supporting portion 707 shaft-supporting the second idler gear 701.
The first idler gear 700 is supported at both ends by the first shaft supporting portion 704 (first supporting portion) and the third shaft supporting portion 706 (second supporting portion). The second idler gear 701 is supported at both ends by the second shaft supporting portion 705 (third supporting portion) and the fourth shaft supporting portion 707 (fourth supporting portion).
The screw gear 702 is rotatably shaft-supported by a shaft supporting portion 708 provided on the accommodating portion frame 41. The shaft supporting portion 708 is provided coaxially with the first residual toner screw 44. The screw gear 702 rotationally drives the first residual toner screw 44 by receiving a rotational driving force from the stirring non-driving-side gear 38a through the first idler gear 700 and the second idler gear 701.
As shown in
In this embodiment, a constitution in which the stirring non-driving-side gear 38a and the gear train 710 are disposed between the supplying portion frame 31 and the accommodating portion frame 41 with respect to the longitudinal direction and in which the residual toner collecting portion 40 is driven by the driving force inputted to the supplying portion frame 31 on a side opposite from the accommodating portion frame 41 was employed. For this reason, drive input to the toner container C including the toner supply to the process cartridge B and the residual toner collection from the process cartridge B can be completed.
Description will be made specifically using the comparison example of
On the other hand, according to this embodiment described above, the drive input to the toner container C is completed on one end side with respect to the longitudinal direction, so that it becomes possible to downsize the toner container C and the printer main body A with respect to the longitudinal direction. Further, in the case where the size of the toner container C of the comparison example with respect to the longitudinal direction is caused to coincide with a size of the toner container C of this embodiment, in this embodiment, a space with respect to the longitudinal direction is effectively utilized, so that it becomes possible to realize a large volume of the toner accommodating portion 30a and the residual toner accommodating portion 40a.
Further, the first residual toner screw 44 is driven by utilizing the driving force of the stirring and conveying unit 36, and therefore, a constitution in which a rotation driving shaft as a separate component part is penetrated from the supplying portion frame 31 and rotation drive is transmitted to the first residual toner screw 44 is not needed. For that reason, compared with a constitution in which the stirring and conveying unit 36 and the rotation drive shaft as the separate component part are arranged in a cross-sectional direction of the toner container C, downsizing of the toner container C with respect to the cross-sectional direction can be realized. The cross-sectional direction is an in-plane direction in an imaginary flat plane perpendicular to the longitudinal direction of the toner container C. Further, the toner accommodating portion 30a and the residual toner accommodating portion 40a can be increased in volume by effectively utilizing a space with respect to the cross-sectional direction.
Further, in this embodiment, the first idler gear 700 and the second idler gear 701 are supported at both ends thereof by the supplying portion frame 31 and the accommodating portion frame 41, respectively. For this reason, compared with a constitution in which each of the gears is supported at one end, falling of each gear due to torque transmission can be reduced. That is, even when a face width of each gear is narrowed, a lowering in transmission efficiency less occurs. For that reason, by narrowing the face width of each gear, it becomes possible to downsize the toner container C with respect to the longitudinal direction while suppressing the lowering in transmission efficiency of the gear train. Further, the toner accommodating portion 30a and the residual toner accommodating portion 40a can be increased in volume by effectively utilizing the space with respect to the longitudinal direction.
In the above-described embodiment, the image forming apparatus with the constitution in which the toner container C is mounted after the process cartridge B is mounted in the printer main body A was described. The present invention is not limited thereto. For example, a constitution in which a unit having a function of the process cartridge B is incorporated in the printer main body A in an undetachably mountable manner and in which the toner container C is detachably mounted in the printer main body A provided with the unit can be employed.
The present invention encompasses at least the following constitutions.
A toner container comprising:
The toner container of the constitution A further comprising:
The toner container of the constitution A1, wherein in a cross section perpendicular to the first rotational axis, with respect to the imaginary rectilinear line, a position of a third rotational axis of the driving gear is positioned between the position of the center axis of the air supply unit and the outlet port.
A toner container detachably mountable to a main assembly of an image forming apparatus, wherein the main assembly includes a photosensitive drum and a developing unit for accommodating toner supplied to the photosensitive drum, the toner container comprising:
A toner container comprising:
The toner container of the constitution C further comprising:
The toner container of the constitution C further comprising:
The toner container of the constitution C, wherein as viewed in the direction of the rotational axis, a position of a rotational axis of the first toner conveying means and a position of a rotational axis of the second toner conveying means are different from each other, and
The toner container of the constitution C, wherein at least a part of the gear train is a helical gear.
The toner container of the constitution C3, wherein at least a part of the gear train is supported by a first supporting portion provided on a surface of the first chamber on the second chamber side in the direction of the rotational axis and by a second supporting portion provided on a surface of the second chamber on the first chamber side in the direction of the rotational axis.
The toner container of the constitution C3, wherein the gear train includes an input gear rotatable about the rotational axis of the second toner conveying means integrally with the second toner conveying means, and the input gear is positioned below the inlet port when the toner container assumes an attitude when mounted in the main assembly.
A toner container detachably mountable to a main assembly of an image forming apparatus, wherein the main assembly includes a photosensitive drum and a developing unit for accommodating toner supplied to the photosensitive drum, the toner container comprising:
While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.
This application claims the benefit of Japanese Patent Application No. 2022-102266 filed on Jun. 24, 2022, which is hereby incorporated by reference herein in its entirety.
Number | Date | Country | Kind |
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2022-102266 | Jun 2022 | JP | national |