Pusher mechanism for glass forming machine
BACKGROUND OF THE INVENTION 
     The present invention relates to machinery for manufacturing glass containers, and specifically, to pusher mechanisms 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 by a pocket air distributor secured to the dead plate opposite the container handling arm to blow the containers fully into their pockets. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide a mechanism which will more rapidly locate the containers in their pockets and which 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. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a schematic showing of a pusher mechanism made in accordance with the teachings of the present invention; 
     FIG. 2 is an oblique view of one of the container receiving pockets illustrated in FIG. 1; and 
     FIG. 3 is a schematic showing of an alternate arrangement for supplying air to the cylinder. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A multi-gob individual section machine deposits a plurality (here three) of formed containers 10 on a dead plate 12. Prior to such placement, a ware handler 14 which has three U-shaped pockets 16 (there could be 1, 2, 3 or 4 such pockets) and which is secured to the rod 18 of the extend/retract pneumatic cylinder 20 is extended to the container receiving position by connecting extend air having a selected pressure P1 to the cylinder to displace the piston 22, and hence, rod 18. (Two-position selector switch S which is controlled by a machine controller 24 is set to one position connecting extend air P1 via the extend air line 23 to the cylinder 20). Generally, this pressure, which can be adjusted by changing the setting of a needle valve N is low (15 psi, for example) so that piston advance will be slow. When the ware handler 14 is fully advanced, the controller 24 switches the selector switch S to its second position connecting a second pressure source P2 (pocket air) to the extend line 23. This second pressure P2 is substantially higher (45 psi, for example) than extend air pressure and can also be adjusted via a needle valve N. 
     A conduit 30 extends through the piston 22 and rod 18, and communicates via distribution lines 31 with upper and lower air conduits 32 which are drilled into the side walls 38 and rear walls 39 of the ware handler 14. These conduits deliver air (either at extend pressure or pocket air pressure) to cylindrical openings 34 in the pocket side walls 38 which are aimed horizontally at the opposite corner of the pocket. Since these openings are small and the pressure is high, air will be discharged at a velocity high enough to locate the container fully in its pocket. The conduits 30, 31, 32 may be substantially larger in cross section than the cylindrical openings 34 to assure uniform pressure at these openings. Such locating of a container is assisted by the continuous surface of its U-shaped pocket. Pocket air will be turned on when the piston is fully advanced and turned off before completion of the transfer of the container to the conveyor 60. The cylinder is displaced through an arc to displace the ware handler from the dead plate 12 to the moving conveyor by a conventional mechanism illustrated as block 21 in FIG. 1. 
     In an alternate arrangement (FIG. 3), air under pressure supplied from a single source is distributed by a distribution rack 50 having extend 52 and pocket air 54 connections. Both lines have a needle valve N to reduce the pressure as desired and the pocket air line additionally has a check valve since it is open to exhaust when extend air is applied.