Image forming apparatus

• US 20110110694A1
• Filed: 11/08/2010
• Published: 05/12/2011
• Est. Priority Date: 11/12/2009
• Status: Active Grant

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Ishikake, Satoru
• Granted Patent: US 8,843,030 B2
• Time in Patent Office: Days
• US Class Current: 399/360
• CPC Class Codes: G03G 21/105 Arrangements for conveying toner waste
• CPC Class Codes: G03G 21/12 Toner waste containers

Abstract

An image forming apparatus using electrophotography includes a waste toner container and an accommodation unit. The waste toner container collects developer used for forming images and ejected from an image forming unit of the image forming apparatus as waste toner. The accommodation unit detachably accommodates the waste toner container in the image forming apparatus. The accommodation unit includes a reduction device to reduce a force required for withdrawing the waste toner container from an interior to an exterior of the image forming apparatus. The reduction device contacts a bottom face of the waste toner container when the waste toner container is partially withdrawn from a fully mounted position of the waste toner container in the accommodation unit to the exterior of the image forming apparatus.

Claims

1. An image forming apparatus using electrophotography, comprising:

a waste toner container to collect developer used for forming images and ejected from an image forming unit of the image forming apparatus as waste toner; and

an accommodation unit to detachably accommodate the waste toner container in the image forming apparatus,

the accommodation unit including a reduction device to reduce a force required for withdrawing the waste toner container from an interior to an exterior of the image forming apparatus, the reduction device contacts a bottom face of the waste toner container when the waste toner container is partially withdrawn from a fully mounted position of the waste toner container in the accommodation unit to the exterior of the image forming apparatus.

2. The image forming apparatus of claim 1, wherein the waste toner container includes a recessed portion formed in a bottom face of the waste toner container, the recessed portion is formed by setting a height of the recessed portion higher than a non-recessed portion of the bottom face of the waste toner container,

the reduction device facing the recessed portion while not contacting the bottom face of the waste toner container when the waste toner container is fully mounted in image forming the apparatus,

the reduction device contacting the non-recessed portion of the bottom face of the waste toner container when the waste toner container is partially withdrawn from the apparatus from the fully mounted position of the waste toner container in the accommodation unit to the exterior of the image forming apparatus.

3. The image forming apparatus of claim 1, the accommodation unit further comprising:

a swing plate disposed at a position facing the bottom face of the waste toner container and corresponding to a position of the reduction device; and

a biasing member to bias the swing plate toward the waste toner container, the biasing member biasing the swing plate to upward of vertical direction,

wherein, when a given amount of waste toner accumulates in the waste toner container, the swing plate displaces downward due to a weight of the waste toner container, positioning the reduction device higher than the swing plate and projecting a portion of the reduction device over the swing plate, in which when the waste toner container is partially withdrawn to the exterior of the image forming apparatus, the reduction device contacts the waste toner container to reduce the force required for withdrawing the waste toner container from the interior of the apparatus to the exterior of the apparatus, and

wherein the reduction device increases a force required to insert the waste toner container accumulating a given amount of waste toner when the waste toner container is inserted into the interior of the apparatus from the exterior of the image forming apparatus.

4. The image forming apparatus of claim 3, wherein the reduction device includes a roller having a one-way clutch that allows rotation of the roller in a direction in which the waste toner container is withdrawn from the interior of the image forming apparatus to the exterior of the apparatus, and the one-way clutch does not allow rotation of the roller in a direction in which the waste toner container is inserted into the interior of the image forming apparatus from the exterior of the image forming apparatus.

5. The image forming apparatus of claim 3, wherein the reduction device includes a rotatable member that is able to contact the bottom face of the waste toner container and a driving force transmission device to transmit a driving force of a drive source of the image forming apparatus to the rotatable member, and

wherein the waste toner container includes a meshing portion at a bottom face of the waste toner container that meshes with the rotatable member.

6. The image forming apparatus of claim 5, wherein the rotatable member is a gear and the meshing portion is a rack that meshes with the gear.

7. The image forming apparatus of claim 6, wherein the gear is formed with a wheel member integrally by forming the wheel member at each end of the gear, the wheel member has a diameter greater than an addendum circle of the gear, and the wheel member has no teeth at an outer face of the wheel member.

8. The image forming apparatus of claim 6, wherein the driving force transmission device includes a torque limiter that absorbs the driving force when the gear receives a predetermined resistance.

9. The image forming apparatus of claim 5, wherein the rotatable member is a worm wheel and the meshing portion is a worm that meshes with the worm wheel.

10. The image forming apparatus of claim 5, wherein the waste toner container includes a meshing face at the bottom face of the waste toner container and a support face projecting from the meshing face, the support face used to support the waste toner container, such that, when the waste toner container stands on a stand face exterior of the apparatus, the support face contacts the stand face.

11. The image forming apparatus of claim 1, wherein the accommodation unit is provided with a door, disposed at a front side of the image forming apparatus, wherein the door includes an assist unit to assist withdrawal of the waste toner container from the interior of the image forming apparatus to the exterior of the image forming apparatus.

12. The image forming apparatus of claim 11, wherein the door includes a door rotation shaft about which the door rotates, wherein the waste toner container includes a convex portion at the front side of the apparatus and the door includes a withdrawing member used as the assist unit to engage with the convex portion to withdraw the waste toner container,

the convex portion of the waste toner container and the withdrawing member of the door engaging each other to withdraw the waste toner container toward the front side of the image forming apparatus when the door is opened.

13. The image forming apparatus of claim 1, further comprising a waste toner transporting unit to transport the waste toner ejected from the image forming unit to the waste toner container, and the waste toner transporting unit defines a waste toner transport route disposed between the image forming unit and the accommodation unit,

wherein the accommodation unit includes a connection unit connectable to a supply port of the waste toner container to connect the waste toner transport route and the waste toner container, and a flexible tube to connect the connection unit and a downstream end of a waste toner transport direction of the waste toner transport route.

14. The image forming apparatus of claim 13, wherein the connection unit provided for the accommodation unit is movable in an up or down direction by a slider disposed for the image forming apparatus,

the accommodation unit changes an arrangement height of the waste toner container in response to an increase in amount of waste toner in the waste toner container, and

the connection unit changes a height of the connection unit using the slider in response to a change in arrangement height of the waste toner container.