We had a Grob just like that at our plant for almost thirty years. It came with an odd boomerang piece that fit with an air cylinder under the table. It would pnuematically feed material into the cut. Naturally the mechanics tossed that almost immediately cuz they didn't understand what it was for.
The bronze blade guides were the weak point. They just wouldn't guide and from new it would always cut to the left. I finally made some roller guides using small cam followers and improved it immensely.
I'll go back to your pics and see if I can spot the cylinder and control valve. There should be a regulator and I think the air fitting is on the back.
Steve
Yep, I can see the control knob on the left under the table, just by the speed change levers.
Oh, just reread your post and note you know about the table feed.....never mind;-))