end of elongate holes 26 b and 28 b and plate 34 in notches 188 b of the extensions b 1 through b 8 when another of the b pushbuttons is depressed in fig8 extension b 1 has been moved to a latched position by the depression of pushbutton b 1 the movement away from latch 36 of member 164 results in an associated coplanar cam follower 200 being disposed in a supported position on edge 202 of the member with opposite ends 204 and 206 of the cam follower in engagement with feed wobble plate 54 and a feed controlling cam 208 rotatable by shaft 44 fig2 as cam 208 is rotated by shaft 44 follower 200 is actuated by the cam the follower actuates wobble plate 54 and the wobble plate acting against a finger 210 on bracket 108 actuates the feed regulating mechanism connected to the bracket arm 124 all according to the profile of cam 208 when a b pushbutton is pushed from an unactuated into an actuated position its coplanar cam follower 40 is moved into a supported position on an inclined edge of the pushbutton extension with opposite ends of the cam follower in engagement with an associated cam 38 and needle plate 52 as in the manner shown for a pushbuttons in fig5 the follower is rocked by the cam as shaft 44 rotates and pivotal movement is imparted to needle plate 52 as previously noted the needle plate acting through bracket 62 pin 68 link 66 crank 74 and link 78 controls the positioning.