Pusher mechanism for I.S. glass forming machine
BACKGROUND OF THE INVENTION 
     The present invention relates to machinery for manufacturing glass containers, and specifically, to pusher mechanism which transfer glass containers deposited on a dead plate of an individual section machine to a moving conveyor which will deliver the containers to a Lehr. 
     In state of the art multi-container pushers, a pneumatic cylinder extends a container handling arm, having a plurality of L-shaped pockets, to a container receiving location. Formed containers are deposited proximate these pockets on a dead plate and air under pressure is directed toward the containers either by a pocket air distributor secured to the dead plate opposite the container handling arm or by air jets which direct pressurized air against the side of the container furthest away from the corner against which it will be located. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide a mechanism which will more effectively locate the containers in their pockets and which will better maintain them so located during rotational displacement of the pusher as it transfers the containers from the dead plate to the conveyor. 
     Other objects and advantages of the present invention will become apparent from the following portion of this specification and from the accompanying drawings which illustrate in accordance with the mandate of the patent statutes a presently preferred embodiment incorporating the principles of the invention. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIG. 1 is an oblique view of a portion of a pusher mechanism made in accordance with the teachings of the present invention; 
     FIG. 2 is an oblique view of the finger assembly of the pusher mechanism shown in FIG. 1; 
     FIG. 3 is an enlarged view of one of the outside corners of a finger on the finger assembly; 
     FIG. 4 schematically illustrates how the invention operates; and 
     FIG. 5 is another oblique view of the finger assembly with selected sections illustrating air flow within the finger assembly. 
    
    
     A pusher mechanism 10 is used to push glass containers 12 (while a cylindrical bottle is shown, the bottle may also be oval, square cornered or flask shape) made in one section of an I.S. (individual section) machine from a dead plate 14 to a transversely moving conveyor 16. Each container ideally becomes located in a pocket of the finger assembly 18 defined by the front surface 20 of a side wall 22 and the forward face 24 of a finger 26. These bottle engagement surfaces are generally covered with a suitable pad 28 to minimize damage to the containers. The finger assembly is secured to the advanceable rod 30 of a cylinder mechanism supported within a suitable housing 32 and the housing 32 is supported for rotation so that the finger assembly can be rotated to locate the bottles in line on the conveyor. The number of pockets will correspond to the number of containers being made in each section of the I.S. machine. As illustrated, the I.S. machine has a triple gob configuration since the finger assembly has three pockets for receiving three containers. In practice, the I.S. machine could be single, double or quadruple gob, as well. 
     At the free end of each finger 26, on the front surface 24 thereof, is defined an air passage 40 which jets pressurized air horizontally at the heel 42 of a container. In the preferred embodiment, this air passage 40 is drilled square to a larger circular surface 43, which is defined in a milling or counter-boring operation along the desired axis of the air passage from the outer surface of the finger 26. FIG. 4 shows a container deposited at a possible location relative to a pocket defined by a pair of pads 28. Line 44 extends through the corner of the pocket and through the axis of the container and line 46 passes through the axis of the container transversely to line 44. Line 46 will be referred to as the transverse diameter and the inward direction will refer to air flow from the jet between the corner of the pocket and the transverse diameter. As can be seen from FIG. 4, the pocket air jet 41 leaving air passage 40 makes an angle of about 30° with the rear pad 28 and strikes the container inwardly of the transverse diameter. As shown in FIG. 4, while some air passes counterclockwise around the container, the jet is aimed so that most jetted air travels clockwise around the container and pulls (force F) the container into and holds the container against the pocket. 
     Factory air (air under a pressure of about 30 to 45 PSI), which can be varied at a conventionally provided manifold by adjusting a regulator to suit the weight and shape of the bottle, is supplied through the rod 30, through an inlet 50, to a cross-manifold 52 which supplies cross-bores 54 extending through each finger to communicate with its associated oblique air passage 40. Line pressure to the rod will be timed on and off as required.