My grandfather had one of these!
I never saw it being used for cutting kale, but it made a great bale carrier once we had hacked off the rocker arm in the middle and removed the associated gubbins.
We got a toplink off a Massey 35 digger and modified it with a section of box iron and a hair trigger.
A very young spn would come down the haggard with a load of bales on't back, stand on the sidebrake just before hitting the elevator, spin the steering wheel, reach back, smack the trigger, the toplink would release, spilling the bales in front of the elevator, drop the hydraulics to lower the buckrake, thus resetting the toplink, and straight back out the gate I came in, and away back to the field for the next 25 bales.
All this without touching the clutch!
I got very skilled at placing the bales exactly where I wanted them after a while.