Printer Label Conveyance Control for Peeling Consistency
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Solution Overview
Problem
In bar code printers, the peeling of labels from label roll paper can cause inconsistent conveyance of the mount paper, leading to printing failures due to variations in contact load between the peeling bar and the mount paper, especially when the mount paper is stretched or bent.
Innovation Solution
The printer includes a controller that controls the conveyance units to ensure the feed amount of the peeled mount paper is less than that of the label roll paper, reducing the likelihood of bending and maintaining a consistent contact load by adjusting the rotational direction and speed of the platen and feed rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the mount paper is conveyed at the conveyance speed of the label roll paper or more during peeling, then the peeling efficiency is improved, but the mount paper becomes stretched and bent, causing inconsistent conveyance and printing failures
Solution Approach 1:
The patent applies dynamics by making the conveyance speed variable rather than constant. The conveyance unit adjusts the conveyance speed of the mount paper dynamically during the peeling process, specifically reducing the speed to prevent stretching and bending while maintaining peeling efficiency. This resolves the contradiction by allowing the system to adapt speed based on the peeling stage.
Solution Approach 2:
The patent changes the parameter of conveyance speed during the peeling process. By reducing the conveyance speed of the mount paper relative to the label roll paper during peeling, the system prevents the mount paper from becoming stretched and bent, thereby maintaining conveyance consistency while preserving peeling efficiency.
2Ease of manufacture
If the peeling bar bends the label roll paper at a sharp angle to peel labels, then the peeling action is effective, but the contact load between the peeling bar and mount paper varies, causing inconsistent conveyance
Solution Approach 1:
The patent changes the conveyance speed parameter to compensate for the variable contact load caused by the sharp bending action. By adjusting the mount paper conveyance speed during peeling, the system maintains consistent conveyance despite the varying contact load from the peeling bar's sharp angle bending.
3Ease of operation
If the mount paper is stretched when the user draws the peeled label, then the front edge portion of the peeling bar bends the mount paper, causing contact load variation
Solution Approach 1:
The patent applies preliminary action by controlling the conveyance speed before the user draws the peeled label. The system reduces the mount paper conveyance speed during peeling to prevent stretching in advance, thereby preventing the subsequent bending and contact load variation that would occur when the user removes the label.
Data Source
AI summary
In one embodiment, a printer for printing on labels has a controller that controls how a mount paper is conveyed. The plurality of labels is attached to the mount paper. The controller controls a first conveyance unit and a second conveyance unit such that a feed amount of the mount paper conveyed in a forward direction by the second conveyance unit is smaller than a feed amount of the mount paper conveyed in the forward direction by the first conveyance unit.