Alps SKFF series
|This article requires photographic illustration|
|Sense method||Metal leaf|
|Keycap mount||Generic cruciform|
The Canon AP400 typewriter in which it was discovered bears the Alps keyboard codes 12KF006C and KFFBA010. The first code places the switch in the SKF family, normally used by simple contact arrangement PCB-mount switches. The latter code gives either SKFF or SKFB; considering that this code is comparatively short, it would appear to be one of the few codes without an extraneous "F" after the "K", giving SKFF.
Alps vertical plate spring switches differ from plate spring by having the plate spring assembly mounted vertically down the side of the switch. This change results in the switch being significantly more complicated than the original plate spring switch. The repositioning of the plate spring assembly allows for two separate plate spring assemblies to be fitted side by side, with a staged actuation to provide a double action response to the host.
The switch is clicky, and the click sound created by inversion of the plate spring is specifically mentioned in both US patents.
The switch exists in single action and double action variants, and supports a spring-mounted LED just as with SKCC series.
Typically, the keystem is a small and cruciform. It has also been found with a tall, angled bar keystem assumed to be compatible with that of Alps SKCC Side-Angled Cream, both of which are from Swedish-made Facit typewriters.
|Alps SKFF White|
|Alps SKFF LED|
|Alps SKFF Bar Angled White|
|Alps SKFF Double Action Black||Second stage spring is internal|
|Alps SKFF Double Action White||Second stage spring assumed to be internal|
- Apple III (double-action white and black)
- Canon AP400 typewriter (momentary, double-action black, illuminated; 1982 example)
- Facit 8111-2 typewriter (bar angled white; cross mount illuminated)