Were there any American shapers with table ''trips'' .......something to knock the feed and main drive clutch out when cut was done?
I once used a big shaper and can't remember the make, .....but it had a trip / come knock out - which meant once running in the cut you could walk away and get on with something else.
I don't know if it was a factory fitting or a shop brew, (the owner was a clever guy) ........but I know it worked a treat.
I've seen some that would run the nut off the screw threads when maximum travel was reached... not as elegant, but worked.
In my mind, there are three sort of general size classifications of "modern" (ie. post flat belt era) shaper:
Small/hobby: South Bend, A****, AMMCo/Delta, Lewis, Rhodes, Logan, Shape-Rite, and so on. All generally in the 6" to 8" stroke range and under 1000 lbs.
Medium/home shop: Sheldon/Vernon, Prema, and a few others. Around 12" stroke and under 2000 lbs. This size range is sort of sparsely populated. A few of the industrial makers (below) smallest offerings could be included in this category, though they are often above the 2000 lb. weight.
Heavy/industrial: Cincinnati, Hendey, Gemco, Gould & Eberhardt, Steptoe, American Tool Works, Rockford, and many others. Smallest stroke will generally be 12", and weight will generally be 3000 lbs. and up.
Andy