A printing module adapted for a 3D printing apparatus, wherein the 3D printing apparatus comprises a frame and a control module, the frame has a printing area and a standby area, the printing module comprising:
- a carriage assembly, disposed on the frame and electrically connected to the control module;
- a first base, disposed on the carriage assembly, the control module driving the first base through the carriage assembly between the printing area and the standby area, the first base having a first latch moving along a first axial direction;
- at least a fixing frame, disposed in the standby area, the fixing frame having a first stopping portion and a second stopping portion arranged along the first axial direction;
- at least a second base, movably disposed in the standby area along the first axial direction, and located between the first stopping portion and the second stopping portion along the first axial direction, the second base having a second latch moving along the first axial direction;
- and
- at least a printing head assembly, having a first latching portion and a second latching portion disposed along a second axial direction that transverses the first axial direction, wherein the printing head assembly and the first base are adapted to move close to each other along the second axial direction, such that the first latching portion drives the first latch to be locked with each other, or the printing head assembly and the second base are moved close to each other along the second axial direction such that the second latching portion drives the second latch to be locked with each other,
- wherein the printing head assembly and the first base locked with each other are adapted to move along the first axial direction and abutted against the first stopping portion to drive the first latch to release the first latching portion, or the printing head assembly and the second base locked with each other are adapted to move along the first axial direction and abutted against the second stopping portion to drive the second latch to release the second latching portion,
- the first base comprises:
- a first base body, assembled on the carriage assembly, the first latch movably assembled in the first base body, wherein the first latch has a first protrusion extending in the first axial direction and movably passing through the first base body along the first axial direction, the first stopping portion is located in a moving path of the first protrusion, the first base body has a wall formed with an opening, when the printing head assembly and the first base locked with each other are abutted against the first stopping portion, the first protrusion is pushed away by the first stopping portion to retract back to the first base body through the opening;
- and
- a first elastic element, extending in the first axial direction and abutted between the first base body and the first latch, the first elastic element permanently driving the first latch so as to protrude the first protrusion to penetrate through the opening in the first axial direction and out of the first base body,
- wherein a distance between the first base and the first stopping portion in the second axial direction is smaller than a distance between the first base and the second stopping portion in the second axial direction.