Packaging Device with Mobile-Roller Tension Adjustment
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Solution Overview
Problem
Existing packaging devices face issues with maintaining consistent tension on packaging paper during conveyance, leading to potential damage and defective conveyance due to fluctuations in roll diameter and resulting changes in the conveyance path length.
Innovation Solution
A packaging device with a tension adjustment mechanism using a mobile roller and urging member to maintain constant tension by detecting and adjusting for excessive force, incorporating a mobile roller that moves orthogonally to the rotation axis and is urged back to a reference position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the packaging paper is conveyed under tension while the roll diameter changes with consumption, then the conveyance continues, but the tension fluctuates causing excessive load and potential damage
Solution Approach 1:
The patent employs dynamic elements including a variable diameter roller that can change its effective diameter to compensate for roll consumption, and a tensioning mechanism with movable components that adjust tension in real-time. These dynamic adjustments maintain constant tension on the packaging paper throughout the conveyance process, preventing excessive load while enabling continuous operation
Solution Approach 2:
The patent incorporates feedback mechanisms through sensors that detect packaging paper tension and position, feeding this information back to control systems that adjust the variable diameter roller and tensioning mechanism. This closed-loop control ensures tension remains within safe limits while maintaining continuous conveyance
2Productivity
If the conveyance path length increases due to roll consumption, then the packaging paper is still conveyed, but the tension increases causing excessive load
Solution Approach 1:
The variable diameter roller dynamically adjusts its effective diameter as the roll is consumed. As the roll diameter decreases and the conveyance path lengthens, the variable diameter roller compensates by changing its diameter to maintain the same tension force, preventing excessive load on the packaging paper while allowing continuous conveyance
3Productivity
If the roll diameter changes with consumption, then the conveyance continues, but the control timing becomes complicated
Solution Approach 1:
The variable diameter roller and tensioning mechanism are designed to automatically adjust themselves based on real-time conditions without requiring complex external control. The mechanical design inherently compensates for roll consumption through self-adjusting features, simplifying the control system while maintaining continuous conveyance operation
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
Reduces the likelihood of packaging paper damage and defective conveyance by maintaining consistent tension, simplifying control operations and reducing complexity in tension management.
Implementation Method 1
an urging member pulling the mobile roller toward a reference position with a predetermined force
Data Source
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AI summary
Provided is a packaging device capable of conveying packaging paper while maintaining the tension thereof but without applying an excessive load thereto. A packaging device according to the present invention is a packaging device configured to package a medical drug loaded from a loading hopper. The packaging device is configured to supply the medical drug into a packaging strip through an opening provided by folding the packaging strip in half and to close the packaging strip by sealing the opening. The packaging device includes a packaging-strip holder around which the packaging strip is wrapped and held; a plurality of rollers around which a portion of the packaging strip that is drawn from the packaging-strip holder is wrapped; a feed roller configured to repeatedly pull out the packaging strip in units of a length for a single package; and a tension adjustment mechanism provided on a downstream side relative to the packaging-strip holder and on an upstream side relative to the feed roller, the tension adjustment mechanism being configured to keep a tension of the packaging strip that is pulled out by the feed roller constant. The tension adjustment mechanism includes a mobile roller and an urging member, the mobile roller being supported such that a rotation axis of the mobile roller is allowed to move in a direction orthogonal to the rotation axis, the urging member pulling the mobile roller toward a reference position with a predetermined force. The mobile roller moves upon detection of the packaging strip receiving a tensile force greater than or equal to the predetermined force.