Reel Rotation Detection for Wire Presence in Saddle Stitch Binding

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Solution Overview

Problem

Existing sheet bundle binding apparatuses face issues with erroneous detection of wire presence on reels due to reduced variation in spring plate guide position, increased manufacturing costs, and difficulty in detecting reel rotation for various shapes, leading to potential wire depletion during binding operations.

Innovation Solution

A sheet bundle binding apparatus with a rotation detecting mechanism that includes a reel support unit, a rotation detecting mechanism with an adhering member and rotating member, and a control unit to accurately detect reel rotation and wire presence, ensuring proper operation even with varying reel shapes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the position of the spring plate guide is used to detect wire presence on the reel, then the detection method can be implemented with existing structures, but erroneous detection occurs when the remaining wire amount is reduced

Engineering Contradiction:

Improvedetection method implementationVSAvoidwire presence detection accuracy

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent replaces the mechanical detection method (spring plate guide position detection) with an optical detection system (optical sensor detecting reflected light from the reel surface). This substitution eliminates the mechanical wear and position variation issues, providing reliable detection of wire presence based on light reflection characteristics rather than mechanical position changes.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an optical sensor as an intermediary detection device that indirectly detects wire presence by measuring light reflection from the reel surface. Instead of directly contacting the wire or relying on mechanical guide position, the optical sensor detects changes in reflected light intensity, providing a non-contact and more reliable detection method.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If direct detection of wire presence is employed, then the detection is straightforward, but manufacturing cost increases and the detecting part wears due to wire contact

Engineering Contradiction:

Improvedetection simplicityVSAvoidapparatus manufacturing cost

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The patent replaces direct mechanical contact detection with optical non-contact detection. The optical sensor detects wire presence by measuring light reflection from the reel surface, eliminating the need for mechanical detecting parts that would wear from wire contact and increase manufacturing costs.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent uses optical reflection as a non-contact copy of the wire presence state. Instead of physically contacting the wire, the system detects the reflection characteristics of light from the reel surface, which changes when wire is present, providing a cost-effective and wear-free detection method.

Inventive Principle:

Principle #26Copying

3Adaptability or versatility

If reel rotation detection is used to determine wire presence, then the method can work with various reel shapes, but it is difficult to suitably detect rotation for different reel configurations

Engineering Contradiction:

Improvereel shape compatibilityVSAvoidrotation detection complexity

Core Design Contradiction:

Adaptability or versatilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent replaces mechanical rotation detection methods with optical detection. The optical sensor detects wire presence by measuring light reflection from the reel surface, which works universally for various reel shapes and configurations without requiring complex mechanical rotation sensing mechanisms.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The optical detection method provides universality across different reel types and shapes. Since the detection is based on light reflection from the reel surface rather than mechanical rotation sensing, it can be applied to various reel configurations without requiring shape-specific detection mechanisms.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12552631B2Sheet bundle binding apparatus and rotation detection method

Publication Date: 2026.02.17 HORIZON INC

AI summary

Provided is a saddle stitch folding apparatus including: a stitcher unit; a reel support unit configured to support a reel rotatably about the axis with a support shaft being inserted in a through-hole formed in the reel; and a rotation detecting mechanism configured to detect a rotation state of the reel, and the rotation detecting mechanism has an adhering member that is rotated while adhered to a bottom face of the reel, a rotating member having an insertion hole inserted in the support shaft, and a rotation detecting unit configured to detect the rotation state of the rotating member.