The paper cutter can't drop the knife when it is working. After measuring the relevant circuit with a multimeter, check the position of the electromagnetic clutch, disassemble the installation part of the electromagnetic clutch, and remove the mime price. The fault has been eliminated. Now I will make a summary.
(1) Use a multimeter to measure and cut off the internal circuit of the button, and the display is normal.
(2) Use a multimeter to stop the safety pin contactor km7, cut-off contactor km8, cut-off time limit relay kt2 and other circuit positions and the safety pin solenoid valve yv3, solenoid valve yv2, and solenoid clutch yc2 in the front-central control position. The circuit at the end of the fuselage. The Zhengzhou printing test seems to be normal, but in the actual test process, the knife cannot be cut. At this time, a flat-blade screwdriver was used to connect the circuit at the position of the contactor km8, and it was found that the knife bed could be cut off normally and returned to its position.
(3) Check and remove the electromagnetic safety plug. Remove the electromagnetic safety lock. First remove the two unit line printed bodies connected to the travel switch, remove the fixing hexagonal screws, and slowly pull out 3 sets of electrical circuits from the junction of the two ends (note the electrical circuit apron marked No. 77, and be careful to drop it). Price, remove the electromagnetic safety pin.
(4) It is found that the armature seat is oily, dirty, rusty, etc., and an appropriate amount of gasoline can be used to stop the liquidation and scrubbing of the compression spring, screw, armature seat and other bolt parts. After the machine is turned on, the printing paper can be cut normally, and the sound of the safety pin is also hard and loud.