Film wrapping machine for product packing device using stretch film

A film wrapping machine for a product packing device using a stretch film, which covers a product with the stretch film supplied from a film supply device which has both side surfaces folded inward to have a flat band shape so that an inner space is formed in a longitudinal direction and supplies a tube-shaped stretch film, the film wrapping machine comprising:

• a frame having vertical bars extending upward and spaced apart from each other such that a lower portion thereof has a movement permissible space in which a product to be wrapped is introduced;
• a film clamping unit including a pair of suction pads which are moved in a direction of being spaced apart from each other in a state of adsorbing the stretch film by vacuum pressure so that a front end portion of the stretch film supplied from the film supply device is opened, and a plurality of clamps configured to grip the front end portion of the stretch film opened by the suction pads, receive the stretch film whose upper end is cut and bonded by the film supply device in a wrinkled state, and process the stretch film to be covered on a product in a process of being lowered along the vertical bars;
• and
• a controller configured to control operation of the film clamping unit and the film supply device so that the clamps of the film clamping unit are lowered along the vertical bars in a state in which the clamps grip the stretch film and the clamps are raised along the vertical bars in a state in which the gripping of the stretch film is released,
• wherein the film clamping unit includes:
• a pair of lifting and lowering support plates each coupled to one of the vertical bars to be lifted or lowered;
• a pair of first horizontal moving plates mounted movably on the lifting and lowering support plates in opposite directions to each other in a first horizontal direction;
• and
• a second horizontal moving plate mounted movably on the first horizontal moving plates in a second horizontal direction orthogonal to the first horizontal direction,
• wherein the clamps each include at least one inner finger roller rotatably mounted to be brought into contact with an inner surface of the stretch film opened at an upper end of the inner support plate extending vertically from an end edge of the second horizontal moving plate,
• a rotating piece having a lower portion which is hinge-coupled to the second horizontal moving plate at a position spaced apart from the inner support plate and is installed to be rotated in a direction of being brought into contact with or separated from the inner finger roller,
• a gripping roller which is rotatably coupled to the rotating piece and is brought into contact with or separated from the inner finger roller,
• a gripping drive motor configured to drive the gripping roller to be rotated forward and backward, and
• a clamping cylinder having a rod that is moved forward or rearward so as to rotate the rotating piece in a direction in which the gripping roller is brought into contact with the inner finger roller or in a direction in which the gripping roller is separated from the finger roller and that is coupled to the rotating piece.