Converting Line Access Control Using Collaboration and Alarm Zones
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Solution Overview
Problem
Existing tissue paper converting lines face challenges in operator safety, visibility, and ergonomics due to the complexity of active safety systems and the need for larger safety fences.
Innovation Solution
A web material converting line with a detection system that distinguishes between a collaboration area and an alarm area, allowing operators to safely approach machinery while preventing hazardous situations by stopping the machinery when an operator enters the alarm area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex active safety systems and large safety fences are used, then operator safety is improved, but device complexity and space requirements increase
Solution Approach 1:
The controlled area is segmented into two distinct zones: a collaboration area where operators can work at reduced speed, and an alarm area that triggers immediate shutdown. This segmentation allows differentiated safety responses based on operator position, reducing overall system complexity while maintaining high safety standards.
Solution Approach 2:
Different safety measures are applied to different spatial locations: the collaboration area allows continued operation at reduced speed, while the alarm area triggers immediate shutdown. This local differentiation optimizes safety responses according to the specific risk level of each zone, reducing unnecessary system complexity.
2Reliability
If large safety fences are used, then operator safety is improved, but the dimensions of the controlled area increase
Solution Approach 1:
The safety system dynamically adjusts machine operation based on operator position rather than using static fences. The machine continues at reduced speed in the collaboration area but shuts down immediately when the alarm area is entered, allowing smaller controlled areas while maintaining safety.
Solution Approach 2:
Physical safety fences are replaced with an optical/electronic detection system that uses presence sensors to monitor operator position. This substitution eliminates the need for large physical barriers while maintaining safety, reducing the controlled area dimensions.
3Ease of operation
If operators can access the machinery closely, then ergonomics and visibility are improved, but safety risks increase
Solution Approach 1:
The machine speed dynamically adjusts based on operator proximity: reduced speed in the collaboration area for safe observation and maintenance access, with automatic shutdown capability when the alarm area is entered. This dynamic response enables close operator access while maintaining safety through speed control and immediate shutdown capability.
Data Source
Figure 1
Figure 2A~3
Figure 2B
AI summary
A web material converting line is disclosed, in particular for converting tissue paper, comprising: a plurality of converting sections arranged in sequence along a feeding direction (F) of a web material to be converted, each section comprising a converting machine; At least one converting section (1; 1A, 1B) of the converting line comprises a detection system (S1, S2, S3) for detecting the presence of people near the converting section (1; 1A, 1B). The detection system comprises at least a first presence sensor (S1; S2; S3) and is adapted to detect the presence of people in at least a controlled area (13). The controlled area (13) is subdivided into an accessible area (15) that can be accessed when the line is working, and an alarm area (17). The detection system (S1, S2, S3) is adapted to distinguish between the presence of an individual in the accessible area (15) and the presence of an individual in the alarm area (17). The detection system is connected to a control unit (41) adapted to intervene on the operation of the converting section based on information provided by the detection system (S1, S2, S3).