Developing Unit Cooling Passages to Prevent Toner Clogging
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Solution Overview
Problem
Existing developing devices face inefficiencies in cooling and developer collection due to increased rotational speeds and reduced size, leading to potential toner clogging and insufficient cooling.
Innovation Solution
A developing device design with an introduction port for suction of floating developer in a transverse direction, connected to a cooling unit via a longitudinal passage with parallel suction and cooling passages, incorporating an intake port for additional cooling air intake, which reduces pressure loss and enhances cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the developing device is reduced in size and rotational speed is increased, then productivity is improved, but cooling efficiency deteriorates and toner clogging occurs
Solution Approach 1:
The suction passage is divided into two separate passages: a first suction passage dedicated to collecting floating developer and a second suction passage dedicated to cooling the developing device. This segmentation allows each passage to be optimized for its specific function, enabling effective cooling even at reduced device size and increased rotational speed.
Solution Approach 2:
The cooling function is added as a separate dimensional aspect by introducing the second suction passage that communicates with the suction hole from a different spatial direction. This allows cooling airflow to be introduced independently from the developer collection function, resolving the conflict between compact size and cooling efficiency.
2Device complexity
If a single suction passage is used for both developer collection and cooling, then device complexity is reduced, but cooling efficiency is insufficient
Solution Approach 1:
The single suction passage is segmented into two functionally independent passages: the first suction passage for developer collection and the second suction passage for cooling. This segmentation resolves the insufficiency of cooling efficiency while maintaining relatively simple device structure through functional separation.
3Device complexity
If cooling air is introduced only through the introduction port, then the structure is simplified, but pressure loss increases and cooling efficiency decreases
Solution Approach 1:
The intake port configuration is extended to a different spatial dimension by adding the second suction passage that introduces cooling air from a direction different from the introduction port. This multi-directional intake reduces pressure loss and improves cooling efficiency without significantly increasing structural complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively increases cooling airflow and reduces developer collection issues, ensuring efficient cooling and preventing toner clogging even at higher rotational speeds and reduced sizes.
Implementation Method 1
the cooling unit is connected to the introduction port to allow passage of gas containing the floating substance in a longitudinal direction of the container, and cools the container with the gas
Implementation Method 2
a suction device (5) is disposed below a developing device (4), and a substance to be collected is sucked through an introduction opening (52a) of a suction passage (52)
Data Source
AI summary
A developing device includes: a container that contains developer; a developer holder that rotates with the developer being held on a surface thereof to transport the developer to a developing region; and a cooling unit. An introduction port is provided at a position corresponding to the developing region, the introduction port allowing suction of a floating substance generated in the developing region in a transverse direction of the container. The cooling unit is connected to the introduction port to allow passage of gas containing the floating substance in a longitudinal direction of the container, and cools the container with the gas. An intake port is connected to an end of the cooling unit in the longitudinal direction, the intake port allowing introduction of gas.