Dynamic Spine-Creating Press Control for Bookbinding

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Solution Overview

Problem

Conventional bookbinding apparatuses face challenges in accurately folding cover sheets over sheet bundles of varying thicknesses, leading to potential damage, unevenness, or adhesive bleeding due to inconsistent adhesive hardness and timing issues, which affect the quality and aesthetics of the finished booklet.

Innovation Solution

The apparatus employs a control system that adjusts the standby positions, operation start times, and movement speeds of spine-creasing press members based on sheet bundle thickness, ensuring consistent folding and adhesive hardening, using sheet stacking, adhesive application, and cover-sheet binding mechanisms to maintain a sharp finish and quality bond.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If the spine-creasing press members move quickly to fold the cover sheet over the spine part of the sheet bundle, then the folding operation is completed in short time, but the softened adhesive will bleed through the cover sheet and ruin the finished booklet

Engineering Contradiction:

Improvefolding operation timeVSAvoidadhesive bleeding

Core Design Contradiction:

Loss of timeVSObject-affected harmful factors

Solution Approach 1:

The control unit delays the start of the spine-creasing press member movement until a predetermined time has elapsed after adhesive application. This preliminary waiting period allows the adhesive to reach optimal hardness before folding begins, preventing adhesive bleeding while maintaining efficient operation timing.

Inventive Principle:

Principle #10Preliminary action

2Object-affected harmful factors

If the spine-creasing press members move slowly to avoid adhesive bleeding, then adhesive hardness is maintained, but the folding operation takes too long and the adhesive may harden completely, preventing proper folding

Engineering Contradiction:

Improveadhesive bleeding preventionVSAvoidfolding operation time

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The control unit establishes a predetermined time window after adhesive application during which the spine-creasing press members are activated. This timing control ensures the adhesive is neither too soft (causing bleeding) nor too hard (preventing folding), optimizing the folding operation within the optimal hardness period.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If the left- and right-side spine-creasing press members are positioned at standby positions far from the creasing position, then they can accommodate different sheet bundle thicknesses, but they take too long to reach the spine part causing adhesive hardening

Engineering Contradiction:

Improvesheet bundle thickness accommodationVSAvoidpress member travel time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The control unit dynamically adjusts the standby position of the spine-creasing press members based on the detected thickness of the sheet bundle. For thicker bundles, press members start from positions farther away; for thinner bundles, they start closer. This dynamic positioning reduces travel time while maintaining adaptability to various thicknesses.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control unit receives feedback on sheet bundle thickness (directly or indirectly through sheet count) and uses this information to determine the appropriate standby position for the spine-creasing press members. This feedback mechanism ensures optimal positioning for each specific sheet bundle, minimizing travel time while preventing adhesive hardening.

Inventive Principle:

Principle #23Feedback

4Loss of time

If the left- and right-side spine-creasing press members are positioned close to the creasing position, then they reach the spine part quickly, but they cannot accommodate thick sheet bundles properly

Engineering Contradiction:

Improvepress member travel timeVSAvoidsheet bundle thickness accommodation

Core Design Contradiction:

Loss of timeVSAdaptability or versatility

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS8894341B2Bookbinding apparatus

Publication Date: 2014.11.25 NISCA KK

AI summary

In binding a cover sheet together with a sheet bundle, ever-accurate spine-creasing irrespective of bundle thickness is made possible. A sheet stacker stacks sheets into bundles, an adhesive applicator applies adhesive to a spine part of the sheet bundles, and a cover-sheet binder binds cover sheets together with the spine parts. The cover-sheet binder is constituted from a left-and-right pair of spine-creasing press members arranged free to shift between standby and spine-creasing positions; a shifter that reciprocates the spine-creasing press members between the standby and spine-creasing positions; and a controller. The controller functions to vary, in accordance with sheet bundle thickness, any of: (1) the standby position of the press members; (2) the start time of an operation whereby the press members are shifted from the standby to the spine-creasing position; or (3) the traveling speed of the press members in shifting from the standby to the spine-creasing position.