Conductive Protection for Gear Detection Reliability
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Summary
Problems
In drive transmission devices, particularly in image forming apparatuses, the rotational position detection of gears can lead to dielectric breakdown due to high potential charges on the image carrying member drive gear, causing abnormal outputs from detection units and potential damage.
Innovation solutions
A drive transmission device incorporating a shape-variable protection member made of conductive material, a charge prevention member, and a detection unit configuration that minimizes electromagnetic interference and corrects positional errors during assembly to prevent dielectric breakdown, including a conductive tape or brush for neutralizing charges on the gear teeth surface.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a conductive member is provided around the detection unit to reduce dielectric breakdown, then the reliability of the detection unit is improved, but the device complexity increases and installation errors may cause damage to the image carrying member drive gear
Why choose this principle:
A shape-variable protection member made of conductive material is introduced as an intermediary between the image carrying member drive gear and the detection unit. This protection member minimizes electromagnetic wave influence on the detection unit while reducing dielectric breakdown occurrences, and its shape-variable nature allows it to adapt to positional errors during assembly, preventing damage to the drive gear.
Principle concept:
If the detection unit is disposed in the vicinity of the image carrying member drive gear for accurate rotational position detection, then the measurement precision is improved, but the risk of dielectric breakdown increases due to high potential charges on the gear
Why choose this principle:
The shape-variable protection member serves as a conductive intermediary that shields the detection unit from electromagnetic waves generated by the charged image carrying member drive gear, allowing close proximity positioning for accurate detection while minimizing electromagnetic interference and dielectric breakdown risks.
Application Domain
Data Source
AI summary:
A drive transmission device incorporating a shape-variable protection member made of conductive material, a charge prevention member, and a detection unit configuration that minimizes electromagnetic interference and corrects positional errors during assembly to prevent dielectric breakdown, including a conductive tape or brush for neutralizing charges on the gear teeth surface.
Abstract
A drive transmission device includes drive transmission members including a detection target gear, a detection device detecting the rotational position of the target gear and including a position detection member and a detection unit, and a conductive protection member protecting the detection unit. The detection unit and the protection member are assembled to the same member to be installed to an external apparatus. If there is a dimensional error in the protection member causing a portion of the protection member closest to the target gear to shift in position relative to the detection unit beyond a predetermined range, the protection member comes into contact with the detection unit in the assembling process, and is corrected in shape by the detection unit, with the shift in position relative to the detection unit of the portion of the protection member closest to the target gear kept within the predetermined range.