Patent GB-774622-A (GB)
Title: Improvements in or relating to oven unloaders
IPC: B65G13/08
Filed: 1955-05-10
Abstract: 774,622. Conveyers. VICARS, Ltd., T. & T. May 10, 1955 [May 10, 1954], No. 13439/55. Class 78 (1). In an oven unloader, baking pans arranged in transverse rows on an oven conveyer 12 pass to a receiving conveyer 22, where they are aligned transversely by a retractable stop 212, and the successive aligned rows are then elevated and transferred to a cross-conveyer 24. The receiving conveyer consists of a series of driven rollers 30, 32, 34, 40, 42, 44 and 46, the rollers 30, 32 and 34 being fluted to guide the forward edges of the pans, while the rollers 42,44 and 46 are elevatable to lift the aligned pans to the level of a further series of driven rollers 228, 222, 224 and 226, forming a feed table for the cross-conveyer. Roller 30 is adjustable for height. The crossconveyer consists of endless chains 248, 250 and 252 positioned in planes between the pairs of rollers 222, 224 and 226 and having their upper runs elevatable to receive the pans from these rollers. The elevation of rollers 42, 44 and 46, and of the upper runs of chains 248, 250 and 252 is carried out in timed relation by a pair of cam-shafts 106, 108 each carrying cams 122, 124, 126 and 264 engaging follower rollers 142, 144, 146, and 266 on the respective elevating assemblies 128, 130, 132, and 268, each of which comprises one or more vertically-slidable rods. The assembly 268 comprises a pair of rods 270, 272 connected at their upper ends to a transverse member on which are mounted one end of each of three support rails 256, 258, 260 for the upper runs of chains 248, 250, 252. The assembly 132 comprises a single rod connected at its upper end to a support 138 for the rollers 46, support 138 having an upwardly-directed portion at its rear end to act as a stop when the support is raised. Support 138 is connected at each end by a bell-crank 200, Fig. 10, pivoted on a bracket 214 to a link 206 having a roller 208 at its lower end slidable in an arcuate slot 204, link 206 being secured at its upper end to a support 210 for the adjacent end of the stop-bar 212. As rollers 46 are raised by the support 138, stop-bar 212 is depressed between rollers 228 and 222, to allow a row of pans elevated by rollers 46 to pass to the rollers 228, 222, 224 and 226 which move the pans against a stop-plate 254 in readiness for being picked up by the chains 248, 250 and 252. The rollers 46 alone are raised when small size pans are used. For use with the pans 18d shown, roller 44 is raised simultaneously, and for still larger pans roller 42 also is raised. To prevent one or both rollers 42 and 44 from being raised when small or medium-sized pans are being used each elevating assembly 128, 130 comprises an upper rod 168 and a lower rod 174, Fig. 13, the upper rods being connected respectively at their upper ends to the supports 134, 136 for the rollers 42, 44, and their lower ends being spaced from the upper ends of the rods 174 when these are in their lowest positions but connectible with them by a pair of independently movable plugs 176, each slidable vertically in a slide 158 which is slidable horizontally. Each slide is connected by a link 180 to the corresponding slide at the other side of the conveyer, and to a hand lever for actuating the slides to move the plugs into and out of aligned position with respect to the rods 168 and 174.