Patent GB-714384-A (GB)
Title: Improvements in baking oven conveyor systems of the tiltable tray type
IPC: A21B1/46
Filed: 1952-07-08
Abstract: 714,384. Endless conveyers. BAKER PERKINS, Ltd. July 8, 1952 [July 14, 1951], No. 17135/52. Class 78 (1) In a conveyer of the type comprising trays pivoted to a .pair of endless chains and guided by means on the trays engaging a fixed track and rotary stabilizing means at the turning points, such that the trays remain horizontal throughout their path; means are provided for tilting the trays for discharge of goods therefrom comprising an opening in the track such that the means on the trays fall through this opening, and supplementary track means adjacent the openings which are engaged by the means on the trays to control the tilting of the trays. As shown, an endless baking oven conveyer consists of a pair of chains 17 between which are pivotally mounted at intervals trays 29, by means of a stub-shaft 39 carried at each side of a tray passing through a bearing 37 carried by a link of the respective chain. Each tray consists of lateral and longitudinal bars 31, 33 fer supporting baking trays. For maintaining the trays horizontal, each tray is provided with an arm 41 secured at one end to one of the stub-shafts 39 and provided at its outer end with a roller 45 engaging tracks 46, 47 running parallel With the straight runs of the conveyer. Adjacent the direction changing sprocket wheels 25 for the chain 17 at the side having the tracks 46, 47 are recessed ring wheels 105. Fig. 5, which engage the rollers passing off the end of one track 46 and transfer them to the following track 47 while maintaining them in the same horizontal plane as the stubshafts 39, and thus maintaining the trays horizontal. The wheels 105 are each driven in synchronism with the adjacent sprocket wheels 25 by an internal ring gear 103 on wheel 105 engaging a pinion 101 on a shaft 93 drive by a sprocket connection 95, 97. 99 from the shaft 59 of the adjacent sprocket wheel 25. Each ring wheel 105 is rotatably supported by its pinion 101 and two rollers 109, 111. Dumping &c. apparatus. As shown, the conveyer has an upper and a lower run, and trays may be selectively tipped at the forward run by means of a trap door 125 in the track 46 which may be opened when it is desdred to tip the trays. When open the roller 45 of each tray drops through but the tray does not swing freely since it has a second roller 51, Fig. 4, which engages a track 131, Fig. 5, to control the tipping movement. The baking pans slide off the tray backwards on to a delivery belt or other conveyer 133, after which the roller 45 is lifted by a track 135 up to a second trap door 141 in track 46 which opens upwardly upon contact with the roller to allow it to pass back on to the track 46 just prior to being engaged by the recessed wheel 105. Tensioning. At the tensioning end of the conveyer the sprocket wheels 27, Fig. 8, around which the chains are passed, the ring wheel 105, and the associated mechanism are supported in a pair of bearing blocks 77 slidable longitudinally of the conveyer by means of roller bearings 79, 81 at their top and bottom edges. The blocks 77 are connected by chains 82 to a drum 87 associated with a second drum 89 having a weight suspended therefrom.