Keyboard Wiring Routing via Upper Stopper Opening
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Solution Overview
Problem
In electronic keyboard instruments with movable hammer structures, improper installation of wiring cables can lead to interference with the hammer structures and keys, affecting key touch feeling and causing mechanical noise, and prioritizing cable installation can limit the design of the hammer structures.
Innovation Solution
The keyboard apparatus features a wiring cable installation method where the cable runs below the key support section, passes through an opening, and extends upward beyond an upper stopper, avoiding interference with hammer structures, and eliminates the need for key-returning springs by using integral key units with synthetic resin, simplifying construction and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wiring cable is installed to exit from opposite sides of the keyboard to avoid interference with hammer structures, then interference between cable and hammer structures is avoided, but the wiring cable has to have an increased length
Solution Approach 1:
The patent introduces an upper stopper as an intermediary component that mediates the spatial relationship between the wiring cable and hammer structures. The upper stopper creates a defined passage space that guides the cable away from moving components, allowing the cable to exit from the same side without increased length while avoiding interference with hammer structures.
2Ease of manufacture
If the wiring cable is taken into account with priority in installation, then cable installation is simplified, but the hammer structures are subjected to design-related limitations
Solution Approach 1:
The patent segments the keyboard apparatus into distinct functional zones: a cable installation region defined by the upper stopper and key support section, and a hammer structure region. This spatial segmentation allows the wiring cable to be installed independently without constraining hammer structure design, as each component operates in its designated zone without interference.
3Ease of operation
If leaf springs are provided beneath each key to return keys to original position, then key return function is achieved, but interference between leaf springs and wiring cable occurs
Solution Approach 1:
The patent extracts the key return function from the traditional leaf spring mechanism and relocates it to the hammer structure itself. The hammer structure is designed to pivot and return to its original position without requiring separate leaf springs beneath each key. This extraction eliminates the source of interference with the wiring cable while maintaining the essential key return function.
Data Source
AI summary
Key frame has a key support section that pivotably supports thereon a plurality of keys. Hammer structures are pivotably provided in corresponding relation to and below the keys, each of which pivots in interlocked relation to depression operation of a corresponding one of the keys. On a rear portion of the key frame, there is provided an upper stopper that is elongated and extends in a direction where the keys are arranged. The upper stopper defines an upper end limit of pivoting movement of each of the hammer structures. Opening portion is formed between the key support section and the upper stopper. Wiring cable connected to a circuit board, having switches corresponding to the keys, is run below the key support section, then passed through the opening portion and thence drawn upwardly beyond the upper stopper so that it is led out to a region above the upper stopper.