Reversible Printer Assembly Bidirectional Label Feed
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Solution Overview
Problem
Low-cost hand-held thermal transfer printers face significant label and liner waste due to their inability to feed labels and ribbons in both directions, resulting in increased costs and reduced label output per roll.
Innovation Solution
A hand-held thermal transfer printer equipped with a cassette reversing mechanism that allows label and ribbon feeding in both forward and reverse directions, utilizing a bearingless directional clutch, reversing clutch, and nip roller to maintain tension and prevent wrinkling, optimizing label usage and eliminating unprinted areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the printer feeds labels only in the forward direction, then the printing mechanism is simple and reliable, but label waste increases due to the large gap between print-line and cut position
Solution Approach 1:
The patent applies the inversion principle by enabling the label feed mechanism to operate in reverse direction. After printing a label, the printer reverses the feed direction to return the label roll to the starting position, eliminating the need for large unprinted gaps. This bidirectional feeding approach recovers label material that would otherwise be wasted, directly addressing the contradiction between reducing label waste and maintaining mechanism simplicity.
Solution Approach 2:
The patent implements dynamics by making the feeding mechanism adaptable and reversible. The mechanism dynamically switches between forward and reverse directions based on the printing cycle stage. This dynamic capability allows the system to optimize label usage by precisely controlling the feed position, thereby reducing waste without requiring a completely complex feeding system.
2Loss of substance
If the printer reverses the label feed direction to reduce waste, then label usage is optimized, but ribbon wrinkling may occur during reversal
Solution Approach 1:
The patent applies the counterweight principle by using tensioning mechanisms that apply counteracting force during the reverse feed operation. These tensioning devices compensate for the gravitational and inertial forces that cause ribbon slack and wrinkling during direction reversal. By maintaining appropriate tension throughout the reversal process, the system prevents ribbon damage while enabling waste reduction through bidirectional feeding.
Solution Approach 2:
The patent implements beforehand cushioning by incorporating tensioning mechanisms that are pre-configured to maintain ribbon tension during reversal. These mechanisms are designed in advance to prevent wrinkling and slack formation before they can occur during the reverse feed operation, ensuring ribbon quality is maintained while enabling the waste-reducing reverse direction capability.
3Productivity
If the printer uses a large unprinted area before and after the printed label, then the feeding mechanism is simple, but fewer labels are produced per label roll
Solution Approach 1:
The patent applies inversion by implementing bidirectional label feeding that reverses the feed direction after each label is printed. This reversal eliminates the need for large unprinted margins before and after each label, allowing the printer to utilize the entire length of the label roll effectively. The result is a significant increase in labels produced per roll, directly addressing the productivity improvement while accepting the necessary increase in mechanism complexity.
Solution Approach 2:
The patent implements dynamics by creating an adaptive feeding system that can switch between forward and reverse directions. This dynamic capability enables precise control over label positioning and eliminates wasted space, maximizing the number of labels that can be produced from each roll. The dynamic nature of the system justifies the increased complexity by delivering substantial productivity gains.
Data Source
AI summary
A method and apparatus for printing labels with reduced waste. The method includes printing a label on an end-portion of a label roll and advancing the label roll such that the end-portion passes a cutter mechanism. The cutter mechanism cuts the end-portion, thereby defining a new end-portion. The method further includes reversing the label roll to align the new end-portion with a printer head. The apparatus may be a drive mechanism that includes a roller for feeding label material in a forward feed mode and in a reverse feed mode. The drive mechanism has a drive clutch configured to engage with a take-up printer ribbon spool. The drive clutch may be operated to (i) transfer a driving force to the take-up printer ribbon spool in a forward feed mode and (ii) allow a release of printer ribbon in a reverse feed mode. The drive mechanism further includes a reverse clutch having a return spring. The reverse clutch may engage with a payout printer ribbon spool and may be operated to (i) prime the return spring of the in the forward feed mode and (ii) transfer a driving force from the return spring to the payout printer ribbon spool in the reverse feed mode. The drive mechanism may be incorporated into a hand-held printer, and therein interact with a removable label cassette to reduce waste of the label material and/or ink ribbon.