An electric pencil sharpener with delay function, comprising a motor, a drive assembly, a gear assembly and a cutter assembly housed in a box body, the gear assembly having an input end connected with the motor, and an output end connected with a connection between the drive assembly and the cutter assembly;
- wherein the drive assembly comprises:
- a connecting rod which is rotatable and movable back and forth;
- a drive shaft and a start trigger which are coaxially and retractably connected to ends of the connecting rod;
- a stop trigger retractably connected to an exterior of the connecting rod;
- and
- a thrust plate which is rotatable and movably disposed on a front end of the drive shaft;
- the stop trigger is located at a front side of the start trigger, a front end of the connecting rod and a back end of the cutter assembly are connected with the output end of the gear assembly;
- the connecting rod is moved backward to drive the start trigger to trigger the motor, under a thrust force action of a pencil inserting into the cutter assembly;
- and the connecting rod is synchronously rotated with the cutter assembly under a driving of the gear assembly;
- the stop trigger is provided with a teeth structure and a friction structure, the connecting rod is provided with a ring portion for matching with the friction structure, the ring portion is provided with a bulge portion for intermittently engaging with one tooth of the teeth structure, an engaging force between the teeth structure and the bulge portion is larger than a friction force between the friction structure and the ring portion;
- the thrust plate and the drive shaft are installed in the cutter assembly at a certain distance, the thrust plate is rotated or moved to push against the drive shaft under a push action of a pencil tip, so that the connecting rod continues to move backwards until the bulge portion engages with the teeth structure, and the ring portion matches with the friction structure, thereby actuating the stop trigger to move left and right to trigger an action of a stop switch of the motor;
- wherein the cutter assembly comprises a cutter holder, a pencil insertion channel, a hob and a cutter shaft, the pencil insertion channel is configured at a bottom side of the cutter holder, and coaxial with the connecting rod, the hob is coaxial with the cutter shaft and obliquely disposed at a top side of the cutter holder, and a rear end of the cutter holder is connected with the gear assembly to drive the hob to make planetary cutting motion around the pencil;
- wherein the drive assembly comprises a first elastic element, a second elastic element and a third elastic element, the first elastic element is configured between the start trigger and the box body for constantly driving the start trigger to move away from a start switch, the second elastic element is configured between the cutter assembly and the gear assembly for constantly driving the cutter assembly to move away from the gear assembly, and the third elastic element is configured between the drive shaft and the cutter assembly for constantly driving the drive shaft to move in a direction releasing the push force to the connecting rod.