Printer Gear Unit with Detachable Bracket for Roller Maintenance
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Solution Overview
Problem
Conventional printers face difficulties in maintaining and replacing rollers due to the complexity of belt and gear systems, which affects maintenance efficiency, accuracy, and print quality, and requires mechanical adjustments for changing print density and transfer speed.
Innovation Solution
A gear unit apparatus with a detachable unit bracket that houses the drive motor, belt group, and gear group, allowing for easy assembly, replacement, and tension adjustment of rollers, improving workability and accuracy by isolating the belt and gear components from the printer main body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If belts and gears are used to transmit rotary driving force to rollers, then the rollers can be driven reliably, but the replacement and maintenance of rollers becomes difficult due to the complexity of the belt and gear system
Solution Approach 1:
The patent divides the printer into two main segments: a fixed section containing the printer bracket, and a movable gear unit apparatus that can be detached. This segmentation allows the gear unit (containing belts and gears) to be separated from the printer body, enabling easy roller replacement without disassembling the entire belt and gear system. The gear unit apparatus acts as an independent module that can be removed and reattached easily.
2Device complexity
If belts and gears are provided on the reverse bracket within the printer housing, then the driving system is compact, but the rollers become difficult to replace requiring opening and closing of the printer cover
Solution Approach 1:
The patent extracts the gear unit apparatus (containing the drive motor, belts, and gears) from the internal housing structure and makes it detachable from the printer bracket. This extraction allows the gear unit to be removed as a separate unit, providing easy access to the rollers for replacement without requiring the printer cover to be opened or closed repeatedly.
3Power
If gears are used for rotary driving, then the driving force can be transmitted effectively, but the position accuracy and transfer control accuracy deteriorate due to gear backlash
Solution Approach 1:
The patent introduces a timing belt as an intermediary element between the gears and the rollers. The timing belt engages with timing gears to transmit rotational motion to the rollers. This intermediary mechanism helps reduce the impact of gear backlash on position accuracy, as the timing belt provides a more precise and consistent transmission ratio while still allowing effective power transmission.
4Adaptability or versatility
If the print density needs to be changed, then the print quality can be adjusted, but the transfer speed must also be changed requiring mechanical adjustment of belts and gears
Solution Approach 1:
The patent makes the gear unit apparatus dynamically adjustable by providing a movable gear unit that can be repositioned along the printer bracket. This dynamic positioning capability allows for easy adjustment of the belt route and gear engagement points, enabling changes in transfer speed and print density without requiring complex mechanical reconfiguration. The gear unit can be moved to different positions to achieve different printing conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances maintenance efficiency, reduces assembly time, stabilizes gear backlash, and allows for easy adjustments in print density and transfer speed without altering component formation, improving overall printing quality and accuracy.
Implementation Method 1
A timing belt 32 and timing gears 42-48, which constitute a belt group 18 and a gear group 19, are used as a means for transmitting, as rotary driving force, the rotary driving force of the drive motor 17 to the platen roller 8 and transfer rollers 11, 13
Implementation Method 2
a drive motor 17, which serves as a rotary driving source for the platen roller 8 and transfer rollers 11, 13
Data Source
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AI summary
To provide a gear unit apparatus for a printer in which the assembling characteristics and maintenance workability of driving sections for transferring a printing paper to be printed can be improved, and particularly assembling, replacement and maintenance work can be easily performed on a platen roller and a transfer roller. The present invention focuses on unitizing a group of belts and a group of gears independently of a printer main body, and is configured such that a unit bracket that is detachable to a printer bracket is provided independently of the printer bracket, a drive motor, the belt group and the gear group are assembled to the unit bracket, and, when the unit bracket is attached to the printer bracket, a platen roller gear of a platen roller and a transfer roller gear of a transfer roller can be engaged with each other.