connected to the reset input of a latch 242 and an inverted output connected to a nand gate 244 the switch 46 is connected to the set input of latch 242 the output of the latch is connected to the other input of nand gate 244 having its output connected to the input of and gate 206 the operation of the circuit of fig1 will now be described to illustrate the sequence of operations occuring during attachment of a tag as discussed above the first step is operating switch 44 which causes latch 226 to be set and the feeder arm solenoid valve 82 to be operated via driving circuit 228 and triac 230 the feeder mechanism advances a selected tag towards the attaching station until it is in place and microswitch 120 is engaged resulting in resetting latch 226 and turning off solenoid valve 82 thereby causing the feeder mechanisn to return a tag is now properly in place in the attaching station the next step is to operate command switch 48 which simultaneously turns on the presser foot solenoid valve 118 via shaping circuit 208 multivibrator 136 driving circuit 212 and relay 214 and turning on the cam gear clutch 29 via latch 210 driving circuit.