Automatic capping machine for containers

1. An automatic capping machine for capping a container, the container having a box body and a cap body, the box body having an upper opening with a convex frame edge, the cap body being cappable onto the convex frame edge, the automatic capping machine comprising:

a main frame body having a positioning part and a workbench;

a bottom conveyor belt movable circularly along an axial direction and disposed horizontally on the workbench, said bottom conveyor belt having a circular shape between at least a pair of rotating wheels, said bottom conveyor belt having a conveying side and a returning side;

at least one lining plate disposed under the conveying side of said bottom conveyor belt along a running path of the conveying side so as to support the conveying side at a minimum height during running along the running path, said at least one lining plate defining a rolling section thereon;

at least one fixed track horizontally disposed on the workbench of said main frame body such that said at least one fixed track and said bottom conveyor belt extend along a direction in which the container is to be conveyed, said at least one fixed track being located above at least one side of said bottom conveyor belt;

at least one rolling mechanism horizontally disposed on the workbench of said main frame body such that said at least one rolling mechanism and said bottom conveyor belt extend along the direction in which the container is to be conveyed, said at least one rolling mechanism being located above said at least one fixed track, said at least one rolling mechanism having a rolling surface, the rolling surface being spaced from said at least one fixed track therebelow so as to define at least one rolling gap, the at least one rolling gap having a height adapted to match a thickness of the convex frame edge of the box body;

a lateral state maintaining structure disposed above the conveying side of the said bottom conveyor belt, said lateral state maintaining structure adapted as to retain the convex frame edge of the box body above said at least one fixed track; and

a through air collision avoidance section formed on the rolling section, said through air collision avoidance section at least covering the rolling surface of said at least one rolling mechanism and adapted such that a bottom of the box body and said bottom conveyor belt have an elastic margin that can be pressed and lowered when the container is transported to said through air collision avoidance section, the elastic margin being less than a minimum distance between the conveying side and the returning side of said bottom conveyor belt.

2. The automatic capping machine of claim 1 , wherein said at least one rolling mechanism comprises two rolling mechanisms, said at least one fixed track comprising two fixed tracks arranged in side-by-side relationship, the two fixed tracks being spaced by an interval from each other.

3. The automatic capping machine of claim 1 , wherein said bottom conveyor belt is formed of an elastic material.

4. The automatic capping machine of claim 1 , wherein said at least one rolling mechanism comprises a driving wheel, a driven wheel, and a rolling belt disposed between the driving wheel and the driven wheel, the rolling belt having a circular shape, the rolling belt having a bottom that forms the rolling surface.

5. The automatic capping machine of claim 4 , wherein the rolling belt has a composite layer structure with an inner layer and an outer layer, the outer layer having a hardness that is less than a harness of the inner layer.

6. The automatic capping machine of claim 1 , wherein said bottom conveyor belt has a plurality of push ribs on a surface thereof, the plurality of ribs being in spaced relationship to each other.