Replacement Frame Rack Stopper for Safe Pull-Out Handling
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Solution Overview
Problem
Existing printing devices face safety risks when manually replacing heavy replacement members, as the replacement frame may fall if pulled out excessively.
Innovation Solution
An accommodating rack with a guide section and rack-side stopper that engages with a frame-side stopper to restrict the removal of the replacement frame, preventing it from falling during manual handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the replacement frame is pulled out for manual replacement of heavy replacement members, then the worker can access and replace the member, but the replacement frame may fall if pulled out too much
Solution Approach 1:
The rack-side stopper protrudes from the accommodating rack to preemptively prevent excessive pull-out of the replacement frame. By positioning the stopper before the potential fall point, the system applies counter-action in advance to offset the harmful effect of over-pulling, allowing workers to access heavy replacement members safely without risking frame instability
2Reliability
If the replacement frame is restricted from being pulled out, then safety is improved, but manual replacement becomes more difficult
Solution Approach 1:
The stopper mechanism applies localized restriction only at the critical pull-out limit, while allowing free movement within the safe operating range. This selective constraint maintains stability where needed (at the stopper engagement point) while preserving ease of operation for normal replacement tasks, avoiding complete immobilization of the replacement frame
Data Source
AI summary
Accommodating rack 51 is used in a printing device including a printing section that performs a printing process of viscous fluid on a processing object using a screen mask, and accommodates, in a shelf shape, a replacement frame including a support portion that supports a replacement member used in the printing device and a frame-side stopper. The accommodating rack includes an accommodating section configured to accommodate the replacement frame, a guide section configured to support the replacement frame and guide the replacement frame between the accommodating section and an outside, and a rack-side stopper protruding toward an inside of the frame from a reference outer surface of the replacement frame and engaging with the frame-side stopper to restrict removal of the replacement frame in a pulled-out state in which the replacement frame is pulled out from the accommodating rack.