bottom patty covered by a top patty uses a cyclically intermittently actuated conveyor to locate each food assembly at a crimping position for a predetermined crimping interval in sequence a confinement tool is moved down to an actuated position to define peripheral limits for the food product a tamping tool is pressed down onto the food assembly to reduce air entrapment and a crimping tool presses the periphery of the top patty into the bottom patty to seal them together in a coherent food product after which these tools are all elevated to rest positions clear of the crimping position and the conveyor operates to move the finished food product away and position a new food assembly at the crimping position to start the crimping cycle anew the crimping tool may include pins that pierce the central part of the food assembly for additional air release application_number US 51682190 A description fig1 affords a schematic plan view of a food production system 10 that includes a crimping station 20 in which a crimping mechanism constructed in accordance with the present invention may be incorporated system 10 includes an intermittently cyclically operated conveyor 11 that extends for the full length of the system conveyor 11 is preferably a belt type conveyor starting at the top of fig1 it is seen that conveyor 11 passes through the output end of a food patty molding machine 12 the food patty molding machine 12 is preferably one of the high volume high.