Intermittent Reel Brake for Packaging Material Misalignment
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Solution Overview
Problem
The existing reel brake devices in packaging machines for pourable food products often cause incorrect unwinding of packaging material due to constant pressure, leading to misalignment and operational inefficiencies.
Innovation Solution
A reel brake device with a brake wheel and actuator system that minimizes contact time with the reel's outer surface by intermittently activating and deactivating the brake, using a control unit to maintain proximity and control the braking force, ensuring proper deceleration without misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reel brake device applies constant pressure to decelerate the rotating reel, then the braking effect is reliable, but the packaging material becomes misaligned and incorrectly unwound
Solution Approach 1:
The brake wheel is designed to periodically contact and separate from the reel surface during rotation. The actuator system controls the brake wheel to apply braking force only during specific phases of the reel rotation, creating a periodic braking action that maintains reliability while preventing continuous pressure-induced misalignment of the packaging material
2Speed
If the brake wheel maintains continuous contact with the reel surface, then deceleration is consistent, but the packaging material unwinds incorrectly
Solution Approach 1:
The brake system transitions from a static continuous-contact design to a dynamic intermittent-contact design. The actuator mechanism enables the brake wheel to dynamically adjust its position, making contact with the reel surface only during specific rotational phases and separating during others, thereby achieving controlled deceleration without continuous material interference
3Power
If the brake applies strong continuous force, then emergency stopping capability is enhanced, but material misalignment occurs
Solution Approach 1:
The brake wheel applies high-power braking forces in periodic bursts during specific phases of reel rotation rather than maintaining continuous force. This periodic high-power application achieves effective emergency stopping capability while the intermittent nature of the braking prevents continuous pressure that would cause material misalignment
Solution Approach 2:
The control system is configured to apply braking force during specific phases of reel rotation that are predetermined to avoid interfering with the packaging material unwinding path. By selecting optimal timing for brake application based on reel rotation phase, the system achieves effective deceleration and emergency stopping while preventing material misalignment from the outset
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
This solution reduces the risk of incorrect unwinding and misalignment, maintaining reactivity for emergency stops while minimizing contact time to prevent material misalignment, thus enhancing operational efficiency and package quality.
Implementation Method 1
a brake wheel (30) adapted to contact an outer lateral surface (27) of the reel (6) and being adapted to rotate around a rotation axis F, in particular parallel to alignment axis C, upon contact with the outer lateral surface (27) and rotation of the reel (6) around central axis A
Data Source
AI summary
A magazine unit for a packaging machine comprises a support device configured to rotatably carry a reel of a packaging material web and a reel brake device configured to decelerate rotation of the reel around a central axis. The reel brake device comprises a brake assembly adapted to interact with an outer lateral surface of the reel of the packaging material web and configured to selectively exert a deceleration force on the reel of the packaging material web for decelerating the rotation of the reel around the central axis. The reel brake device comprises a support rail moveably carrying the brake assembly and an actuator device configured to actuate, in use, movement of the brake assembly along the support rail at least towards the outer lateral surface so as to establish contact of at least an interaction element of the brake assembly with the outer lateral surface of the reel.