AC69 INITIATES EVASIVE MANEUVER ON IFR DEP FROM TUP WHEN OBSERVING A PA28 CALLING FOR ADVISORY 3 MI W OF ARPT AT SAME ALT.

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I WAS DEPARTING TUP ARPT ON AN INST FLT PLAN. AFTER TKOF; I TURNED L TO MY ASSIGNED HDG AND ABOUT 1 MIN LATER I WAS ON A COLLISION COURSE WITH A PIPER 140. I TOOK EVASIVE ACTION AND THE FLT CONTINUED UNEVENTFULLY TO WICHITA; KS. AT TUP ARPT HOLDING ON THE TXWY FOR TKOF WERE 2 OTHER PLANES IN FRONT OF ME -- A KING AIR AND A PIPER CHEROKEE. I COULD TELL THAT A NEW CTL TWR OPERATOR WAS BEING TRAINED. DEPS WERE USING RWY 36. WX VFR; CEILINGS RPTED AT 5000 FT BROKEN. THE KING AIR WAS LAUNCHED AND THEN THE PIPER CHEROKEE. THE CHEROKEE WAS CLRED TO THE N. MY INITIAL IFR CLRNC WAS RADAR VECTORS; A L TURN TO 270 DEGS AND AN INITIAL CLB TO 3000 FT. AFTER LIFTOFF; I TURNED L TO MY ASSIGNED HDG. I WAS LOOKING OUTSIDE THE COCKPIT. AS I CONTINUED A SLOW CLB PASSING 1500 FT TO MY ASSIGNED 3000 FT ALT; I ALL OF A SUDDEN NOTICED A PIPER 140 HDG N THAT WAS DIRECTLY IN MY FLT PATH. I PUSHED THE NOSE OF MY PLANE DOWN. I THEN HEARD THE PIPER 140 TALKING TO TUP TWR ADVISING THEM THAT THEY WERE TAKING PICTURES OF THE AREA. AT THIS POINT; WE (BOTH PLANES) WERE APPROX 3 MI W OF TUP ARPT. I WAS STILL ON WITH TUP TWR AND I ADVISED TWR THAT I WAS MANEUVERING UNDER AND BEHIND THE PIPER 140. TWR HAD NOT HAD A CHANCE TO TALK YET. MY FLT CONTINUED UNEVENTFULLY TO WICHITA; KS. THE NEW PIPER 140 SEEMED TO BE 'POP UP TFC' IN THE VICINITY OF THE ARPT. THE PIPER 140 AT LEAST CALLED THE TWR ADVISING THEM ABOUT THEIR 'PICTURE TAKING.' IT IS MY USUAL PROC TO SCAN FOR TFC -- ESPECIALLY BELOW 10000 FT. HAD I NOT BEEN EXERCISING VIGILANCE OUTSIDE THE COCKPIT THAT DAY; I SURELY WOULD HAVE SLAMMED INTO THIS CASUAL FLYING PIPER.