Wire Guide Position Detection in Sheet Stitching Apparatus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sheet stitching apparatuses fail to precisely detect changes in the position of the wire guide due to varying wire tension, leading to inaccurate detection of wire feed errors and potential defective product discharge.
Innovation Solution
A detector system comprising a swing arm with a proximity sensor and follower projection, which adjusts to the degree of bending of the wire guide, allowing precise detection of position changes irrespective of wire reel remaining amount, and generates error signals for operational monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a detector is arranged to detect wire presence in the wire feed path, then wire runout errors can be detected, but errors caused by wire feed path clogging, wire entanglement, or stitching head abnormal operation cannot be detected
Solution Approach 1:
The patent replaces wire presence detection with mechanical displacement detection. Instead of detecting whether wire is present in the feed path, the system detects the displacement of the wire guide caused by tension changes during normal wire feeding operations. This substitution enables detection of operational abnormalities while maintaining the ability to distinguish normal from abnormal states.
Solution Approach 2:
The patent introduces a wire guide as an intermediary element that translates wire tension changes into detectable positional changes. The wire guide acts as a mediator between the wire feed system and the detector, converting internal tension variations into external displacement signals that can be monitored to detect operational abnormalities.
2Measurement precision
If wire tension varies due to different wire reel remaining amounts, then the wire guide position changes, but precise detection of position changes becomes difficult
Solution Approach 1:
The patent employs a dynamic detection approach where the detector monitors changes in wire guide position relative to a reference position. Instead of attempting to detect absolute position (which varies with wire tension), the system detects dynamic changes from the reference state, allowing accurate detection of abnormal displacements regardless of the wire reel's remaining amount.
Solution Approach 2:
The patent changes the detection parameter from absolute wire guide position to displacement from reference position. By monitoring the change in position rather than the absolute position, the system eliminates the interference of varying wire tension caused by different wire reel remaining amounts, thereby maintaining detection accuracy under varying conditions.
3Productivity
If the stitching head operates continuously even when wire supply troubles occur, then productivity is maintained, but defective products are discharged
Solution Approach 1:
The patent implements a feedback mechanism where the detector continuously monitors wire guide position and compares it against the reference position. When abnormal displacement is detected, the system provides feedback to stop the stitching head operation, preventing defective product discharge while allowing continuous operation during normal conditions.
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
Enables accurate detection of wire feed errors and prevents defective product discharge by monitoring the wire guide's position change and stitching head's operation, ensuring timely intervention during wire reel depletion or path obstructions.
Implementation Method 1
a wire guide (4) consisting of a thin and long plate spring
Implementation Method 2
a detector for detection of a position of the wire guide (4)
Data Source
AI summary
In a sheet stitching apparatus in which a wire W reeled out from a wire reel 5 is cut only a predetermined length, the cut wire is bent into a U-shape and driven into a set of sheets S, both ends of the U-shaped wire are bent and the set of sheets are stitched, there is provided a detector 10-15 arranged for movement according to a change in a degree of bending of the wire guide 4 effected by a change in a remaining amount of the wire of the wire reel 5 for detection of a change of position of the wire guide effected by a pull-in operation of wire by the stitching head 2.