Winding Device Lever and Elastic Mechanism for Print Media
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Solution Overview
Problem
Conventional winding devices experience adverse effects on conveyance precision and bagginess due to inertia-induced slowing of winding speed and widthwise crushing of print media, leading to slack and uneven layering.
Innovation Solution
A winding device with a power transfer mechanism that includes a lever and elastic member to absorb rotational energy, and annular ribs on flanges to prevent widthwise crushing, ensuring stable winding and maintaining conveyance precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the winding speed is designed to be substantially the same as the conveyance speed, then the winding device can operate smoothly, but the inertia of the take-up roll causes the winding speed to become slower than the conveyance speed when winding starts, resulting in slack in the print medium
Solution Approach 1:
The elastic member (spring) is pre-compressed to store elastic energy that will be released to counteract the inertia of the take-up roll at the start of winding. This preliminary energy storage creates a preliminary anti-action force that prevents slack formation before it occurs, addressing the contradiction between stability and precision.
Solution Approach 2:
The elastic member acts as a cushioning element that absorbs the shock and inertia effects when winding starts. By providing beforehand cushioning through the pre-compressed spring, the system prevents the winding speed from dropping below conveyance speed, thereby maintaining both stability and precision simultaneously.
2Stability of the object's composition
If the rotational energy of the take-up roll is transmitted directly to the print medium to eliminate slack, then the slack disappears, but the print medium is pulled toward the winding device, adversely affecting the conveyance precision
Solution Approach 1:
The elastic member serves as an intermediary between the take-up roll and the print medium. Instead of direct transmission of rotational energy that pulls the print medium, the spring mediates the energy transfer by releasing elastic energy gradually, eliminating slack without adversely affecting conveyance precision.
3Ease of manufacture
If the second flange is installed by lightly pushing it against the side edge of the print medium, then the flange can be positioned, but the print medium is crushed widthwise, causing gaps and bagginess
Solution Approach 1:
The annular rib is added to the second flange to create a local quality enhancement at the critical contact point with the print medium. This localized structural feature distributes the contact pressure, allowing easy installation while preventing widthwise crushing and maintaining print medium integrity.
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 adverse effects on conveyance precision and reduces bagginess by managing rotational energy and preventing widthwise crushing, allowing for stable and precise winding of print media.
Implementation Method 1
the inertia (inertial moment) of the take-up roll and slack develops in the print medium
Implementation Method 2
a lever disposed between the winding shaft and the conveyance roller in a conveyance path
Data Source
AI summary
A winding device includes a winding shaft that rotates and winds a print medium conveyed from a printing device having a conveyance roller that conveys the print medium, a gear, and a motor driving the conveyance roller and the gear. The winding device also includes a power transfer mechanism to connect to the gear and transfer power to the motor, and a lever disposed between the winding shaft and the conveyance roller in a conveyance path in a configuration in which the winding device is connected to the printing device. The lever may be moved between a first position in which the print medium bends and a second position in which the print medium bends at a shallower angle than at the first position.