Sheet Punching Device Synchronization for Continuous Conveyance
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Solution Overview
Problem
Existing sheet punching devices either lack accuracy due to involute curve shapes causing clearance issues or suffer from low efficiency as they require temporary cessation of sheet conveyance to punch holes accurately.
Innovation Solution
A sheet punching device that rotates a die and moves a punch in and out of the die hole in synchronization, allowing for accurate and efficient hole punching without stopping sheet conveyance, using a mechanism involving a reciprocating punch holder and cam system to maintain alignment and prevent galling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the die and punch are engaged while rotating in the rotary type sheet punching device, then punching efficiency is improved by maintaining continuous sheet conveyance, but manufacturing precision deteriorates due to clearance generated between the involute curve shaped punch tip and die hole entrance
Solution Approach 1:
The invention employs dynamic engagement where the punch and die are engaged while rotating during sheet conveyance, allowing continuous punching operation without stopping the sheet feed mechanism, thus maintaining high productivity while the rotational motion itself helps maintain alignment
Solution Approach 2:
The punch tip and die hole entrance are designed with preliminary engagement features that ensure proper alignment before the actual punching action, preventing clearance issues from affecting hole punching accuracy even when engaged during rotation
2Manufacturing precision
If the punch is moved perpendicular to the sheet in the press punch type sheet punching device, then manufacturing precision is improved by achieving accurate hole shapes, but productivity deteriorates due to temporary stopping of sheet conveyance
Solution Approach 1:
The invention merges the advantages of both rotary and press punch types by combining the continuous conveyance capability of rotary punching with the accurate hole shaping capability of perpendicular punch movement, achieving both high precision and continuous operation
Solution Approach 2:
The punch is moved dynamically in and out of the die hole while the die rotates, allowing the punch to maintain perpendicular engagement with the sheet for accurate hole shaping while the rotational motion enables continuous sheet conveyance without stopping
Data Source
AI summary
A sheet punching device including: a die which has a die hole and is configured to be driven to rotate; a punch configured to move in and out of the die hole to punch a hole in a sheet; and a punch operating unit configured to reciprocate the punch with respect to the die hole in a state in which the punch is opposed to the die hole of the die, to move the punch in and out of the die hole.