Patent Application
20130216243
This application claims priority based on Japanese Patent Application No. 2012-035631, filed on Feb. 21, 2012, the entire contents of which are incorporated by reference herein.
The present invention relates to a toner replenishing container and an image forming apparatus detachably provided with the toner replenishing container, and more particularly, the toner replenishing container that replenishes the toner to a developing section of an image forming apparatus, which forms a color image, with toner and an image forming apparatus that is detachably provided with the toner replenishing container.
In the past, there has been an electrophotographic image forming apparatus. This image forming apparatus is generally initialized by uniformly charging a photoreceptor drum, forms an electrostatic latent image on the photoreceptor drum by optical writing, converts the electrostatic latent image into a toner image, that is, develops the electrostatic latent image, directly or indirectly transfers the toner image onto a transfer medium such as a sheet, and fixes the toner image with a fixing unit.
A developing unit is used to convert the electrostatic latent image into the toner image. The developing unit is provided with a developing roller that supplies toner to a photoreceptor drum, an auger roller that supplies toner to the developing roller while stirring and conveying the toner, and the like.
The toner present in the developing unit is a consumable that is consumed by development. When a sensor, a printed sheet counter, or the like detects that the toner present in the developing unit is equal to or smaller than a predetermined amount, the developing unit is replenished with toner from a toner replenishing container. The toner replenishing container, of which toner is used up and which becomes empty, is replaced with a new toner replenishing container.
Meanwhile, in the image forming apparatus for forming a color image, images are generally formed using, for example, four kinds of colors, that is, black, magenta, cyan, and yellow. For this reason, the image forming apparatus is provided with four kinds of image forming units. The image forming unit generally includes a developing kit and a photoreceptor kit.
In an early image forming unit, the developing kit is replaced with a new developing kit when toner of the developing kit is consumed and is used up. However, it is not easy to replace the developing kit. Accordingly, JP-A-09-50174 proposes a color electrophotographic apparatus in which a toner cartridge for replenishing a developing unit with toner is detachably mounted on the developing unit so that the developing unit can be easily replenished with toner for each color.
Meanwhile, generally, four kinds of toner replenishing containers (toner cartridges) corresponding to the developing kits (developing units) of the four kinds of image forming units have the same appearance and structure except that the colors of the toners stored in the toner replenishing containers are different from each other.
Since the toner replenishing containers have the same appearance and structure as described above, there was often a problem that, for example, a toner replenishing container storing a magenta toner is mounted on a connection portion connected to a developing kit developing a cyan toner image by mistake, or the like.
In order to solve such a problem, JP-A-2003-84534 discloses an image forming apparatus where incompatible identification devices are provided on toner replenishing containers and toner replenishing container-mounting portions provided on an apparatus body so as to correspond one to one. That is, there is proposed an image forming apparatus where incompatible “shape” or “mounting position” is set on a guide rail guiding a toner replenishing container to a mounting portion.
However, since a guide rail has different shapes or is provided at different positions on the four mounting portions for the toner replenishing containers in JP-A-2003-84534, an assembly process in a factory becomes complicated. In addition, an engagement groove, which is engaged with the guide rail, of the toner replenishing container also needs to have a different shape or be formed at a different position according to the kind of stored toner.
For this reason, since different molding dies are required for the toner replenishing containers corresponding to the kinds of stored toners, not only are costs increased but also space and effort are required for the inventory control of the toner replenishing container, which also causes costs to increase.
The invention has been made to solve the problem in the related art, and an object of the invention is to provide a toner replenishing container that can be automatically distinguished as, for example, four kinds of toner replenishing containers by a simple structure and an image forming apparatus that is detachably provided with the toner replenishing container.
In order to solve the problem, a toner replenishing container of the invention includes a storage chamber, a hole and an identification member. The storage chamber stores a toner for replenishment. The hole is engaged with the toner replenishing container identifying portion of the mounting portion when the toner replenishing container is mounted on the mounting portion, is formed at a predetermined position on a front surface of the toner replenishing container in a mounting direction, and has a polygonal cross-section. The identification member is detachably inserted into the hole in a form corresponding to the polygonal shape of the hole when an orientation of the identification member is rotated about a center line of the hole.
In order to to solve the problem, an image forming apparatus of the invention includes a mounting portion and a toner replenishing container identifying portion. A toner replenishing container is detachably mounted on the mounting portion so that a hole of the toner replenishing container corresponds to a front surface in a mounting direction. The toner replenishing container includes a storage chamber, the hole and an identification member. The storage chamber stores a toner for replenishment. The hole is formed at a predetermined position and has a polygonal cross-section. The identification member is detachably inserted into the hole in a form corresponding to the polygonal shape of the hole when an orientation of the identification member is rotated about a center line of the hole. The toner replenishing container identifying portion is provided on the mounting portion so as to be engaged with the hole when the toner replenishing container is mounted on the mounting portion.
Further, according to the invention, it is possible to obtain an effect of providing a toner replenishing container that can be automatically distinguished as several kinds of toner replenishing containers by a simple structure where one kind of identification member is inserted into each polygonal hole of toner replenishing containers having the same structure, and an image forming apparatus that is detachably provided with the toner replenishing container.
A more complete understanding of this application can be obtained when the following detailed description is considered in conjunction with the following drawings, in which:
Embodiments of the invention will be described in detail below with reference to the drawings.
A printer 1 shown in
In order to transfer a toner image to a lower traveling portion-surface 8a of a transfer belt 8 in a so-called back surface transfer method, the image forming section 2 has a structure where four image forming units 9 (9k, 9c, 9m, and 9y) are arranged side by side from the right side to the left side in
The image forming section 2 is held by a frame of a body of the printer 1 so as to be capable of moving up and down between a printing position shown in
Further, the image forming unit 9k forms a monochrome image made of a black (K) toner that is mainly used for letters, dark portions of images, or the like. The respective image forming units 9 have the same structure except for the colors of the toners that are used to develop images. Accordingly, the structure of the image forming unit 9y for a yellow (y) toner will be described below by way of an example.
The image forming unit 9 is provided with a photoreceptor drum 10 at the uppermost portion thereof. The peripheral surface of the photoreceptor drum 10 is made of, for example, an organic photoconductive material. A cleaner 11, a charging roller 12, an optical writing head 13, and a developing roller 15 of a developing unit 14 are disposed so as to come into contact with or surround the peripheral surface of the photoreceptor drum 10.
The developing unit 14 includes a unit housing 16 that covers the external portion of the developing unit, a partition wall 17 that is provided in the developing unit, a developing roller 15, a first stirring/conveying screw 18, and a second stirring/conveying screw 19. Although not particularly shown, each of the first and second stirring/conveying screws 18 and 19 includes a screw shaft and fins that are formed integrally with the screw shaft and rotate.
As shown by Y, M, C, and K in
The transfer belt unit 3 includes the above-mentioned endless transfer belt 8 that extends in the shape of a flat loop in the horizontal direction of
A primary transfer roller 23 is assembled integrally with the unit on the transfer belt 8. The primary transfer roller 23 comes into press contact with the photoreceptor drum 10 with the transfer belt 8 interposed therebetween, and directly transfers a toner image onto the lower traveling portion-surface 8a of the transfer belt 8 that is circularly moved on the lower side (primary transfer).
The transfer belt 8 is conveyed to a secondary transfer section 24 that further transfers the toner image onto a sheet (secondary transfer). The secondary transfer section 24 includes a transfer auxiliary roller 25 that is disposed on the downstream side (the upper side in
A belt cleaner 27 is disposed on the transfer belt 8. The belt cleaner 27 includes a cleaning blade 28 that comes into contact with the surface of the transfer belt 8 that is stretched by the driven roller 22. Further, a waste toner collecting container 29 is detachably disposed adjacent to the left and lower portions of the belt cleaner 27.
The belt cleaner 27 scrapes and removes waste toner, which remains on the surface of the transfer belt 8 by the cleaning blade 28, and sends the waste toner to the waste toner collecting container 29 by a conveying screw (not shown).
The toner supply section 4 is detachably provided with the four toner replenishing containers 20 (20y, 20m, 20c, and 20k) that are disposed above the upper traveling portion of the transfer belt 8. A yellow (y) toner, a magenta (M) toner, a cyan (C) toner, and a black (K) toner are stored in the four toner replenishing containers 20 as described above.
Although hidden on the side facing the transfer belt unit 3 and not shown in
Although not particularly shown, the toner supply section 4 is held by the frame of the body of the printer 1 with the mounting portions interposed therebetween so as to be capable of moving up and down between a printing position shown in
The sheet feeding section 5 includes two sheet feeding cassettes 30 (30a and 30b) that are disposed in two stages, that is, the upper and lower stages. A sheet ejecting roller 31, a feeding roller 32, a separation roller 33, and a pair of standby conveying rollers 34 are disposed near each of the sheet feeding ports (the right side in
The above-mentioned secondary transfer section 24, which includes the transfer belt 8, the transfer auxiliary roller 25, and the secondary transfer roller 26 and transfers the toner image to a sheet, is formed in the sheet conveying direction of the pair of standby conveying rollers 34 (above the pair of standby conveying rollers 34 in the vertical direction of
The belt type thermal fixing unit 6 is disposed on the downstream side (upper side in
The conveying unit 7 for duplex printing also functions as an opening/closing member of which the outer surface (the right outer surface in
The conveying unit 7 for duplex printing includes a return passage 39 that includes a start return passage 39a, an intermediate return passage 39b, and an end return passage 39c. The start return passage 39a diverges from a portion immediately in front of the pair of sheet discharge rollers 38 to the right side in the horizontal direction of
Further, five pairs of return rollers 41 (41a, 41b, 41c, 41d, and 41e) are disposed on the return passage 39. An outlet of the end return passage 39c is joined to a conveying passage that is directed to the pair of standby conveying rollers 34 corresponding to the lower sheet feeding cassette 30b of the sheet feeding section 5.
One end opening (an upper right end in the oblique direction in
A coupling 45, which stirs the toner stored in the housing 42 and conveys and sends the toner to a toner replenishing passage connected to the mounting portion, is disposed at the center of the front surface of the shutter cover 44. An IC (integrated circuit) board 46, which stores printing information or the like, is mounted on the upper left portion of the front surface of the shutter cover 44.
Furthermore, the upper right corner of the front surface of the shutter cover 44 is a portion that is engaged with a toner replenishing container identifying portion of the mounting portion when the toner replenishing container 20 is mounted on the mounting portion of the apparatus body 1. A quadrangular (square in this embodiment) hole 47 is formed at this position. An L-shaped member 48 is detachably inserted into the hole 47. The hole 47 and the L-shaped member 48 form an identification portion 50 of the toner replenishing container 20.
In
Meanwhile, a retaining pin for separation prevention, which prevents the L-shaped member 48 inserted into the hole 47 from being separated from the hole 47, is provided in the hole 47, but is not shown in
In the state where the L-shaped member 48 has been completely inserted into the hole 47 shown in
In
Accordingly, in the toner replenishing container 20y shown in
Further, in the toner replenishing container 20m shown in
Furthermore, in the toner replenishing container 20c shown in
Moreover, in the toner replenishing container 20k shown in
That is, which color toner of the four kinds of color toners is to be stored in the toner replenishing container 20 is set according to which corner portion 47-1, 47-2, 47-3, or 47-4 forms the space of the hole 47, that is, the position of the L-shaped member 48 inserted into the hole 47.
As shown in
Meanwhile, in
Further, in
Furthermore, in
Moreover, in
In any case, when the toner replenishing container 20 is mounted on the toner replenishing container-mounting portion 51 that corresponds to the same color as the color of the toner stored in the toner replenishing container 20, there is no problem. When the toner replenishing container 20 is mounted on the toner replenishing container-mounting portion 51 that corresponds to a color different from the color of the toner stored in the toner replenishing container 20, the identification pin 52 collides with the L-shaped member 48. For this reason, the toner replenishing container 20 cannot be mounted on the toner replenishing container-mounting portion 51 that corresponds to a color different from the color of the toner stored in the toner replenishing container 20.
For example, even though the toner replenishing container 20m is to be mounted on the toner replenishing container-mounting portion 51y of
Moreover, likewise, even though the toner replenishing container 20c is to be mounted on the toner replenishing container-mounting portion 51y by mistake, the identification pin 52 collides with the corner portion of the L-shaped member 48. For this reason, the toner replenishing container 20c cannot be mounted on the toner replenishing container-mounting portion 51y.
Further, likewise, even though the toner replenishing container 20k is to be mounted on the toner replenishing container-mounting portion 51y by mistake, the identification pin 52 collides with the horizontal end portion of the L-shaped member 48. For this reason, the toner replenishing container 20k cannot be mounted on the toner replenishing container-mounting portion 51y.
Even when the toner replenishing containers 20 are mounted on the other toner replenishing container-mounting portions 51m, 51c, and 51k, the same is applied. Accordingly, the positions of the identification pins 52 protruding from the toner replenishing container-mounting portions 51 uniquely correspond to identification pin fitting spaces that are formed in the holes 47 of the identification portions 50 of the toner replenishing containers 20.
As described above, according to the first embodiment of the invention, not only the shape of the toner replenishing container but also the L-shaped member, which serves an external member, of the identification portion is formed by one kind of member. Accordingly, it is possible to suppress the manufacturing costs of parts and costs for inventory control to a low level, so that the first embodiment is economical.
Since the dimensions of the hole 47 and the dimensions of the L-shaped member 48 to be inserted into the hole 47 are close to each other as described above, the L-shaped member 48 inserted into the hole 47 is not easily separated from the hole 47.
Since the identification corner setting member 53 of this embodiment is formed in an arc shape, two corners facing each other are empty. However, if a corner inside the arc is used as an identification corner and an identification pin 52 having a large diameter and fitted into a wide space inside the arc is used, a corner outside the arc is not detected as an identification corner since a space outside the arc is narrow.
That is, the identification corner setting member 53 is adapted so as to be fitted into the hole 47 in a form where the identification pin 52 of the toner replenishing container identifying portion can be fitted into only one of the four corners and the identification pin 52 of the toner replenishing container identifying portion cannot be fitted into any of the rest of the corners.
Even in this embodiment, for example, a lower right corner 47-1 of
Due to this shape, the identification corner setting member 54 of this embodiment is formed in the shape that includes a 90 degree-corner portion and two 45 degree-corner cut portions and closes three corners of the hole 47 and leaves only one corner empty. That is, the identification corner setting member 54 of this embodiment is adapted so as to be inserted into the hole 47 in the form where one corner of a quadrangle is empty and all the rest of the corners are closed even though the identification corner setting member 54 is inserted into the hole 47 in any orientation.
Even in this embodiment, for example, a lower right corner 47-1 of
Due to this shape, the identification corner setting member 55 of this embodiment is formed in the shape where three corners of the hole 47 are closed by a pivot portion of the fan shape and both open end portions and one corner is empty. That is, the identification corner setting member 55 of this embodiment is adapted so as to be inserted into the hole 47 in the form where one corner of a quadrangle is empty and all the rest of corners are closed even though the identification corner setting member 55 is inserted into the hole 47 in any orientation.
Even in this embodiment, for example, a lower right corner 47-1 of
Meanwhile, in the above-mentioned embodiments, the vertical and horizontal dimensions of the hole 47 are shown to be smaller than the vertical and horizontal dimensions of the identification corner setting member in all cases. However, for example, if a material of the identification corner setting member is hard rubber that is flexible enough for the identification corner setting member to be pushed into the hole 47 and has resistance when the identification pin 52 bumps into the identification corner setting member, the identification corner setting member can be used without difficulty even though the vertical and horizontal dimensions of the identification corner setting member are the same as the vertical and horizontal dimensions of the hole 47.
Further, in the above-mentioned embodiments, the hole 47 has been formed in a quadrangular shape and a total of four kinds of shapes including the shape of the L-shaped member 48 have been shown as the shapes of the identification corner setting member. The shape of the identification corner setting member is not limited thereto, and the hole may have a polygonal shape that has three or more sides.
In short, the shape of the identification corner setting member may be the form where one corner is empty and all of the rest of corners are closed or the form where the identification pin can be fitted into only one corner and cannot be fitted into any of the rest of the corners, even though the identification corner setting member is inserted into the hole in any orientation.
The invention can be used to distinguish the kind of a toner replenishing container replenishing a developing section of an image forming apparatus, which forms a color image, with toner.
Having described and illustrated the principles of this application by reference to one preferred embodiment, it should be apparent that the preferred embodiment may be modified in arrangement and detail without departing from the principles disclosed herein and that it is intended that the application be construed as including all such modifications and variations insofar as they come within the spirit and scope of the subject matter disclosed herein.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2012-035631 | Feb 2012 | JP | national |
