Printer Spindle Grounding and Gear Cover Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Large-format printers require a safety function to prevent finger entry into rotating parts and an antistatic function for heavy, conductive metal spindles holding roll paper, which existing technologies have not adequately addressed.
Innovation Solution
A medium supply device with a displacement member that pivots to cover the driven gear and includes a grounding member to ensure safety and antistatic functions, using a conductive spindle with a drive gear system to rotate the spindle, while a detecting unit monitors spindle presence for reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal spindle is used to hold heavy roll paper, then the spindle can reliably hold the roll paper, but electrostatic charges accumulate on the spindle
Solution Approach 1:
A grounding member is introduced as an intermediary component between the metal spindle and the ground. This grounding member makes electrical contact with the spindle and conducts electrostatic charges to the ground, eliminating the harmful effect while preserving the metal spindle's structural strength and holding capability.
2Ease of repair
If the driven gear is exposed for maintenance, then ease of repair is improved, but safety hazards increase due to finger entry risk
Solution Approach 1:
The cover portion is designed as a movable component that can pivot between a closed position (providing safety) and an open position (providing access for maintenance). This dynamic structure allows the system to adapt between safety and ease of repair requirements based on operational state.
Solution Approach 2:
The displacement member automatically moves to the advanced position and closes the cover portion before the driven gear begins to rotate. This preliminary action ensures safety is established before the hazardous state occurs, preventing finger entry risks from the outset.
3Object-affected harmful factors
If the displacement member automatically covers the driven gear, then safety is improved, but device complexity increases
Solution Approach 1:
The displacement member is designed to automatically respond to spindle installation and gear rotation conditions without requiring external control systems. The mechanism uses the spindle's own presence and the gear's rotation state to trigger appropriate displacement member positions, achieving self-service safety functionality.
Solution Approach 2:
The displacement member combines multiple functions into a single component: it covers the driven gear for safety, provides a grounding path for electrostatic discharge, and responds to spindle installation. This merging reduces the need for separate safety devices while maintaining comprehensive protection.
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 solution effectively prevents finger entry into rotating parts and minimizes electrostatic charges by grounding the spindle, ensuring safe and efficient operation of the printer.
Implementation Method 1
a grounding member contacting, at the advanced position, the spindle, thereby coupling to a ground potential
Data Source
AI summary
In a medium supply device, a receiving portion includes a support portion configured to rotatably support a spindle, and a drive gear meshing with a driven gear provided at the spindle to rotate the spindle, and a displacement member includes a pivoting shaft configured to pivot between an advanced position where the spindle is covered and a retracted position where the spindle is exposed, an abutting portion abutting the spindle when the spindle is installed at the receiving portion, the abutting portion being configured to cause the displacement member to pivot to the advanced position, an opposing portion abutting, at the advanced position, an outer peripheral surface of the spindle installed at the receiving portion, a cover portion configured to cover the driven gear, and a grounding member contacting the spindle, thereby coupling to a ground potential.