Conveyor chain for thermoplastic film - engages film with pointed bars on chain rivets whose shanks do not project, and supports on chain track have flat face over side of bars

摘要

A conveyor, to carry a thermoplastic film through the various processing points on a machine has a pair of conveyor chains with pointed bars which pass through the edges of the film; these bars are held by supports on the side facing the film, and the chains are driven intermittently round in guide tracks. The rods are fixed on to the rivet shanks in such a way that the latter do not project out of the surface of the rods, and their supports rest flat against the outer face of the rods. The figure shows a cross-section through one guide track (1) for a chain. It has slots to take the chain (2) which has rollers and is driven intermittently round the system. The distance between the two chains is adjustable to suit the width of the film used (8). The chain (2) has the pointed bars (9) on one side and these pass through the film (8). The bars (9) are so fixed on to the shanks of the rivets (13) of the chain (2) that the chanks (13) do not stand out of the surface (11) of the bars (9). Supports (12) are also fixed to the track (1) and the face of each support (12) fully covers that (11) of the bar (9) on the length of chain which conveys the film but not on its return. ADVANTAGE - The design significantly reduces wear on the components concerned.