This application is based on Japanese Patent Application No. 2011-200075 filed on Sep. 14, 2011, the content of which is incorporated herein by reference.
1. Field of the Invention
The present invention relates to a toner supply system, especially a toner supply system that is suited to be provided in an image forming apparatus, such as an electrophotographic copying machine or printer, for supplying toner to the apparatus, and relates to a toner container used for the toner supply system.
2. Description of Related Art
Generally in an electrophotographic image forming apparatus, for the purpose of replenishing toner consumed for image formation, a toner supply system is provided. With the toner supply system, a toner container stored with toner is detachably mounted in an apparatus body, and an appropriate amount of toner is supplied from the toner container to the apparatus body. It is to be noted that the toner supplied by this toner supply system is further measured and adjusted so that an amount of toner consistent with a consumed amount can be supplied to a development device.
This kind of toner container is mountable in and dismountable from a receiving section in the apparatus body. The toner container is substantially in the shape of a cylinder, and while the toner container is mounted in the receiving section, it can be rotated on the axis of the cylinder. On the inner wall of the cylindrical toner container, a spiral convex or fin is formed, and as the toner container is rotated, the spiral convex or fin serves to feed toner to a toner supply port made in the receiving section. The toner container has no choice but to have a smaller supply-side opening than the outer diameter of the toner container for the reason of spatial restriction. Therefore, there is an upslope or a step in the vicinity of the supply-side opening, which is an obstacle to the toner feed.
Meanwhile, there has recently been a tendency to use low-melting-point toner. As the low-melting-point toner is stored under high temperature, the fluidity thereof becomes low. When the toner container stored with low-fluidity toner is mounted in the receiving section, even the function of the spiral convex or fin as a feeder cannot satisfactorily resolves stagnation of toner in the vicinity of the supply-side opening, where the toner feed is inhibited. This makes it difficult to ensure a toner supply be conducted satisfactorily.
There have been proposed a toner supply apparatus and a toner bottle described in Japanese Patent No. 4423140 and Japanese Patent Laid-Open Publication No. 1111-305531 for resolving stagnation of toner, but those have not necessarily exerted sufficient effects.
A first aspect of the present invention provides a toner supply system comprising: a receiving section that is set in a body of an image forming apparatus so as not to rotate; and a substantially cylindrical toner container that is mountable in and dismountable from the receiving section and that can be driven to rotate on an axis while being mounted in the receiving section, wherein: the toner container has a first toner feeder for feeding toner stored therein toward the receiving section while the toner container is rotated; and the receiving section has a supply port that permits the toner fed thereto with rotation of the toner container to drop down and a toner stirrer that extends to a position close to the first toner feeder located inside the toner container while the toner container is mounted in the receiving section.
A second aspect of the present invention provides a substantially cylindrical toner container that is mountable in and dismountable from a receiving section set in a body of an image forming apparatus so as not to rotate and that can be driven to rotate on an axis while being mounted in the receiving section, and the toner container comprises: a first toner feeder for feeding toner stored in the toner container toward the receiving section while the toner container is rotated; wherein one end of the first toner feeder is located in a position close to a toner stirrer provided in the receiving section.
These and other features of the present invention will be apparent from the following description with reference to the accompanying drawings, in which:
Hereinafter, toner supply systems and toner containers according to embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in
The reservoir section 40 is installed with a stirring blade 41, a toner measuring section 42 and a toner feeding screw 43. Toner supplied to the reservoir section 40 through the supply port 31 is fed to a supply port 44 by the screw 43, and further, toner in an amount to compensate for toner consumed for image formation is supplied to a development device (not shown).
The toner container 10 is substantially of a long cylindrical shape and is made of resin. A spiral convex 12 is formed on an inner wall of a body of the container 10, and as the body of the container 10 is rotated on its axis, toner, which is pooled at the bottom of the container 10 with a layer thickness T shown in
The body of the toner container 10 has a predetermined outer diameter D1, and the end 11 of the container 10 has an inner diameter D2 smaller than the outer diameter D1. In the end portion 11 of the container 10, a sloping surface 13 rises as going forward in a toner feeding direction (see arrow A), which inhibits the spiral convex 12 from feeding toner. In order to facilitate the toner feed, on an inner wall of the open end 11, a sloping surface 14 that serves to feed toner to the supply port 31 is formed between the supply port 31 and a convex section 12a on the leftmost side in
While the toner container 10 stored with toner rests under high temperature, the fluidity of the toner lowers. This tendency is especially true of a case of using low-melting-point toner. In such a case, a certain part of toner on the sloping surface 13 is fed to the supply port 31 by the sloping surface 14 (second toner feeder), but the toner feed by the sloping surface 14 is not sufficient. Therefore, in the first embodiment of the present invention, the receiving section 30 is provided with the toner stirrer 35 extending from its rear end to a position close to the spiral convex 12 (first toner feeder). The toner stirrer 35 is a rectangular plate made of resin having rigidity, and the plate is supported vertically in a cantilever state by the rear end surface of the receiving section 30.
In the toner supply system 1A of the configuration above, the open end 11 of the toner container 10 is fitted in a tube 33 of the receiving section 30, whereby the container 10 is rotatably mounted in the receiving section 30 and is connected to the rotary drive mechanism (not shown). Also, the end 11 of the container 10 presses the shutter 32 in a direction shown by arrow A, to open up the supply port 31. Thereafter, while the container 10 is being rotated, toner stored in its bottom is fed in the direction shown by arrow A and passes over the sloping surfaces 13 and 14. Then, the toner is dropped and supplied to the reservoir section 40 through the supply port 31. At this time, even if toner is solidified and stagnated on the sloping surfaces 13 and 14, the stirrer 35 collapses the stagnated toner with the rotation of the container 10, thereby generating a flow of the toner. Thus, a toner feed to the supply port 31 is ensured.
It should be noted that the first toner feeder is not necessarily the spiral convex 12, and the first toner feeder may be a spiral fin. Alternatively, the first toner feeder may be a rotary body that can rotate together with the container 10, for example, a screw-like rotary body formed separately from the container 10. Further, the toner stirrer 35 may be somewhat flexible.
As shown in
As shown in
It should be noted that the toner supply system and the toner container according to the present invention are not restricted to the above embodiments. Especially with respect to the toner container and the receiving section, the details of the configurations and the shapes thereof can be arbitrarily designed. Also, the drive mechanism for rotating the toner container can be arbitrarily designed.
Although the present invention has been described in connection with the preferred embodiments above, it is to be noted that various changes and modifications are possible for those who are skilled in the art. Such changes and modifications are to be understood as being within the scope of the present invention.
Number | Date | Country | Kind |
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2011-200075 | Sep 2011 | JP | national |