Dot Impact Printer Carriage Line-Feed Mechanism
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Solution Overview
Problem
Conventional dot impact printers are limited in the amount of information they can print in one reciprocating movement, as they only print while the carriage moves on a forward path, restricting marketability by not allowing information to be conveyed in a column direction orthogonal to the row direction.
Innovation Solution
A printing unit with a carriage that moves reciprocally in a row direction, supported by a guide pillar and a line-feed mechanism, allowing movement in a column direction via a line-feed plate and guide member, enabling printing in both forward and backward paths to create two columns of information on a recording medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If printing is performed only during the forward path movement, then the structure is simple, but the information amount that can be printed is limited
Solution Approach 1:
The patent introduces a column direction (vertical dimension) orthogonal to the traditional row direction (horizontal dimension) by adding a line-feed mechanism with guide pillars and a line-feed plate. This allows the carriage to move not only horizontally for printing but also vertically to feed the recording medium, enabling printing in multiple columns and significantly increasing the information amount that can be printed in one reciprocating movement.
2Adaptability or versatility
If the recording medium is fixed and cannot be conveyed, then the structure is simple, but the marketability is limited
Solution Approach 1:
The patent adds vertical movement capability in the column direction through the line-feed mechanism, allowing the recording medium to be conveyed upward between printing operations. This transforms the printer from a single-line device to a multi-line device, significantly improving adaptability and marketability for applications requiring extensive information output.
3Manufacturing precision
If two driving sources are used for line-feed operation, then the movement precision is improved, but the device complexity and cost increase
Solution Approach 1:
The patent makes the carriage's reciprocating movement mechanism serve dual functions: it performs both the traditional printing function during forward path movement and the line-feed function through the engaging sections. The single driving source that moves the carriage back and forth also drives the line-feed plate and guide member to move the carriage vertically, eliminating the need for a separate line-feed motor while maintaining precise control.
Data Source
AI summary
A printing unit includes a carriage, a printing head mounted on the carriage, a guide pillar configured to support the carriage to be reciprocatingly movable in the front-back direction, a unit frame configured to support the guide pillar to be movable in the left-right direction, and a line-feed mechanism configured to move the carriage in the left-right direction. The line-feed mechanism includes a line-feed plate supported by the guide pillar to be movable in the front-back direction and a guide member configured to engage with the line-feed plate and guide the line-feed plate in the left-right direction together with the guide pillar according to the movement in the front-back direction of the line-feed plate. The line-feed plate includes a forward-path engaging section with which the carriage engages in a process from a forward-path start point to a forward-path end point in the front-back direction and a backward-path engaging section with which the carriage engages in a process from a backward-path start point to a backward-path end point in the front-back direction.