Drive Conversion Mechanism with One-Way Clutches for Unidirectional Output
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Solution Overview
Problem
Existing drive arrangements in machines like inkjet printers suffer from lost motion and inefficiency when reversing the direction of input rotary motion, as they require time and motion to engage the proper idler gear for unidirectional output.
Innovation Solution
A drive conversion mechanism with constantly meshed gears and a pair of clutches arranged about an output shaft, allowing only alternate engagement to ensure rotary output motion in a single direction, utilizing one-way clutches like ball or wrap spring clutches to transmit rotation in one direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a drive arrangement uses alternately meshed idler gears to reverse input direction while maintaining unidirectional output, then the system can achieve direction reversal capability, but it suffers from lost motion and engagement time when switching between gears
Solution Approach 1:
The patent applies preliminary action by pre-positioning multiple idler gears in constant mesh with the input gear, so that when direction reversal is needed, the output shaft is already aligned with the appropriate idler gear. The clutches are pre-arranged in opposite orientations so that one clutch is already engaged while the other is disengaged, eliminating the need for time-consuming engagement transitions and reducing lost motion during direction changes
2Ease of operation
If a drive arrangement uses alternately meshed idler gears to reverse input direction, then direction control is achieved, but the system experiences lost motion during gear switching
Solution Approach 1:
The patent implements continuity of useful action by maintaining constant mesh between the input gear and multiple idler gears, ensuring that the drive train never disengages. The clutches are arranged so that one clutch is always engaged while the other is disengaged, providing continuous torque transmission without interruption. This eliminates lost motion that would occur during engagement/disengagement cycles in traditional alternating gear arrangements
3Productivity
If constantly meshed gears are used in the input gear train, then lost motion is reduced, but additional clutches are required to maintain unidirectional output
Solution Approach 1:
The patent applies asymmetry by arranging the clutches in opposite orientations about the output shaft, with each clutch designed to engage only in one rotational direction. This asymmetric configuration allows the constantly meshed gear train to efficiently transmit power in both input directions while the asymmetric clutch arrangement ensures unidirectional output, managing the added complexity through symmetric opposition rather than random arrangement
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
This solution minimizes lost motion and enhances efficiency by maintaining constant output direction during input rotation reversals, reducing engagement time and motion, and providing a more compact and efficient drive arrangement.
Implementation Method 1
Each clutch is a one-way clutch and, more particularly, may be a ball clutch adapted to engage on the shaft so as to transmit rotation in only the single direction
Data Source
AI summary
A drive conversion mechanism includes a rotatably mounted output shaft, a pair of output gears mounted on the output shaft so as to rotate independent of one another and relative to the output shaft and being displaced from each other axially along the output shaft, and a pair of one-way clutches arranged about the output shaft. Each clutch is connected to one of the output gears and extends about the output shaft in respective orientations that are the reverse of each other such that the one-way clutches can only drivingly engage the output shaft at alternate times, and thus not at the same time, so as to cause the output shaft to rotate in a same single direction as the output gears are driven in opposite directions relative to each other by an input train of constantly meshed input drive and idler gears.