Slitter Unit Blade Speed Control for Printing Medium Feeding
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Solution Overview
Problem
The existing image printing apparatus experiences conveyance failures due to improper feeding of the printing medium into the slitter unit, leading to issues such as paper jam.
Innovation Solution
Incorporating a slitter unit with upper and lower movable blades that rotate and are driven by a control unit to ensure their movement speed exceeds the conveyance speed of the printing medium, thereby ensuring proper feeding and cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the slitter unit uses round-shaped movable blades to cut the printing medium, then the cutting function is achieved, but the printing medium is not properly fed into the slitter unit causing conveyance failure
Solution Approach 1:
The control unit controls the driving amount of the driving unit such that the movement speed of the blades passing through the contact point becomes greater than the conveyance speed of the printing medium. This preliminary speed adjustment ensures the printing medium is properly fed into the slitter unit before cutting occurs, preventing conveyance failure
Solution Approach 2:
The patent changes the speed parameter of the blades by controlling the driving amount of the driving unit. The movement speed of the blades is specifically adjusted to be greater than the conveyance speed of the printing medium, which resolves the feeding problem and improves conveyance reliability
2Reliability
If the blade movement speed is increased to ensure proper feeding, then conveyance failure is prevented, but the complexity of speed control increases
Solution Approach 1:
The control unit monitors the conveyance speed of the printing medium and adjusts the driving amount of the driving unit accordingly. This feedback mechanism ensures the blade movement speed is always greater than the conveyance speed, maintaining reliable operation without requiring complex mechanical modifications
Data Source
AI summary
The present invention relates to a printing apparatus including: a conveyance roller; and a slitter unit configured to cut a printing medium, which is conveyed by the conveyance roller, wherein the slitter unit includes a cutting mechanism including an upper movable blade and a lower movable blade, each of which is in a round shape, and configured to cut the printing medium at a contact point of the upper movable blade and the lower movable blade, a driving unit configured to rotate the upper movable blade and the lower movable blade, and a control unit configured to control a driving amount of the driving unit, and wherein the control unit controls the driving amount of the driving unit such that a movement speed of the upper movable blade and the lower movable blade passing through the contact point becomes greater than a conveyance speed of the printing medium.