Double-Spindle Brewing Unit for Single-Motor Piston Coffee Machines
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Solution Overview
Problem
Conventional brewing units in piston coffee machines are often costly due to the need for multiple motors and complex designs, which compromise between fast movement and defined pressing forces, and lack a compact and lightweight structure.
Innovation Solution
A double-spindle brewing unit with constant pitch ratios and a single drive motor, utilizing an outer spindle and inner spindle with a gearing mechanism, allowing for adjustable positions and high speeds without additional motors, and incorporating a spindle re-engagement device for efficient coffee grounds discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple motors and complex drive mechanisms are used, then defined pressing forces and reliable position control are achieved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple drive functions (brewing chamber positioning, shower screen movement, plunger pressing) into a single motor system. The first motor (20) drives the outer spindle (3) which controls brewing chamber position, while the second motor (20) drives the inner spindle (7) which controls shower screen and plunger position. This merging of drive functions reduces the number of motors from three to two, simplifying the drive mechanism while maintaining reliable position control through the gearing mechanisms (21, 22).
Solution Approach 2:
The single motor (20) is designed to perform multiple functions: positioning the brewing chamber, moving the shower screen, and pressing the coffee powder. The motor achieves this through different gearing mechanisms (21, 22) that translate a single rotational input into multiple controlled movements. This multi-functionality reduces device complexity by eliminating the need for separate motors for each function.
2Force
If multiple motors are used for brewing chamber movement and coffee powder pressing, then defined pressing forces are achieved, but weight and cost increase
Solution Approach 1:
The patent merges the functions of multiple motors into a single motor system. The first motor (20) drives both the outer spindle (3) for brewing chamber positioning and, through the gearing mechanism (22), the inner spindle (7) for coffee powder pressing. This consolidation reduces the overall weight of the brewing unit by eliminating redundant motors while maintaining the ability to apply defined pressing forces through the mechanical advantage of the gearing system.
3Ease of operation
If conventional drive mechanisms are used, then brewing unit functionality is achieved, but compactness and lightweight design are compromised
Solution Approach 1:
The patent employs a nested spindle configuration where the inner spindle (7) is positioned within the outer spindle (3). The inner spindle controls the shower screen and plunger, while the outer spindle controls the brewing chamber. This nested arrangement allows multiple drive functions to be compactly integrated, reducing the overall volume of the brewing unit while maintaining full functionality. The spindles and gearing mechanisms are arranged to minimize space requirements.
4Reliability
If complex drive mechanisms are used, then reliable coffee grounds discharge is achieved, but device complexity and cost increase
Solution Approach 1:
The patent combines the coffee grounds discharge function with the existing brewing chamber positioning mechanism. The brewing chamber (2) is moved to a discharge position where coffee grounds can be ejected, eliminating the need for a separate pusher mechanism. This merging of functions reduces device complexity while maintaining reliable coffee grounds discharge through the gravity-assisted ejection process.
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
The solution results in a compact, lightweight, and cost-effective brewing unit capable of achieving high speeds and defined coffee grounds discharge with centric force application, reducing the need for multiple motors and enabling flexible adaptation to different drive motors.
Implementation Method 1
a double-spindle assembly having an outer spindle (3) and an inner spindle (7)
Implementation Method 2
at least one gearing mechanism (21, 22)
Data Source
AI summary
A brewing unit for a piston coffee machine is designed as a spindle brewing unit with an outer spindle and inner spindle, and with a brewing slide as a brewing chamber, two piston units in the form of a showerhead and a plunger, a drive motor, and at least one gearing mechanism.