a second gate 90 is provided the detailed construction of the gate 90 fig3 is identical to the gate 30 with the exception of the end portions 92 which extend beyond the frame a greater distance than the end portions of the gate 30 so that the operating links 94 will not interfere with the operating link 56 of the gate 30 and the operating link 78 for the slide member 72 the links 94 are connected at one end to the ends 92 of gate 90 by the pivots 96 and at the other end to one arm of bell crank levers 98 by pivots 100 a second operating link 102 for the second gate 90 is connected at one end to the other end of one of bell crank levers 98 at pivot 104 and is connected at the other end to a cam follower lever 103 which is identical to cam follower lever 60 and mounted on the same shaft 64 but outwardly of the lever 60 from the frame 28 this cam follower lever would cooperate with the cam 106 shown in fig1 and 4 which is also disposed outwardly of the cam 68 on the shaft 70 the cam 106 is identical to the cam 68 so that the same timing sequence is imparted to the gate 90 that is imparted to the gate 30 as evidenced by the timing chart.