Sealing and packaging device for cover film on tray

A sealing and packaging device for sealing a cover film onto a tray, comprising:

• a chain conveyor for pushing and advancing trays at equidistant intervals along a horizontal conveyance path;
• a general frame moving reciprocally in the direction of travel of the trays within a central cutaway region formed between an upstream conveyance path section and a downstream conveyance path section of the conveyance path;
• a deck plate supported on the general frame via leg members, said deck plate for transferring the trays from the upstream conveyance path section to the downstream conveyance path section;
• and
• a sealing base frame disposed to surround the deck plate and moving upwards and downwards by means of a lift;
• the sealing base frame moving upwards and downwards in synchronism with the reciprocal movement of the general frame, and performing a box motion due to the reciprocal movement of the general frame and the upward and downward movement of the sealing base frame caused by the lift;
• the tray mounted on the deck plate being pushed up together with a packaged item accommodated in a mounded fashion in the tray, towards a band-shaped film in the upper region due to the box motion of the sealing base frame, the band-shaped film being welded to a flange of the tray by pressing the band-shaped film to a sealer supported on the general frame, wherein:
• the deck plate is supported in an upwardly and downwardly movable fashion on a frame formed integrally with the sealing base frame, by means of the leg members, and simultaneously when the sealing base frame during the upward progress makes contact with the lower surface of the tray flange of the deck plate, a touching base provided on the frame makes contact with the lower surface of the deck plate, such that the deck plate makes close contact with the base surface of the tray while the tray is pushed upwards by the sealing base frame.