pressurized air through control valve 74 is changed at the same time returning the rod 37 to its original position and applying pressurized air to cylinder 41 through control valve 76 as the rod 42 of cylinder 41 moves so as to mechanically contact the mechanical control valve 66 plate 43 engages the lug 27 moving the shaft 24 approximately 90 u00b0 further the flow of pressurized air is changed through control valve 76 through mechanical control valve 66 so as to apply air through control valve 77 to cylinder 46 the pressure in cylinder 46 moves the piston rod 47 for engagement with the mechanical control valve 64 so that the end plate 48 engages the lug 27 moving it approximately 90 u00b0 further the flow of pressurized air is changed in control valve 77 through mechanical control valve 64 applying air pressure through control valve 71 to cylinder 51 moving piston rod 52 and plate 53 for engagement with the lug 27 moving the shaft 24 a further 90 u00b0 this completes a 360 u00b0 cycle leaving the crank at 0 u00b0 in the needle down operation mode manually depressing pushbutton 12a on control valve 62 applies pressurized air to the control valves 68a 69a 79a and 82a of control valve 68 69 79 and 82 respectively and to cylinder 84.