Patent GB-985572-A (GB)
Title: Cooking apparatus for fish in open cans
IPC: A23B4/005
Filed: 1961-09-26
Abstract: 985,572. Preserving food by heating in open cans. INTERNATIONAL MACHINERY CORPORATION S.A. Sept. 26, 1961 [Dec. 6, 1960], No. 34387/61. Heading A2D. [Also in Division B8] - A fish cooker has a plurality of consecutive fish processing chambers, means for receiving and continuously conveying open fish-filled cans in random formation through the chambers, means for selectively directing steam or a hot gas into the chambers whereby the order in which fish in the cans may be subjected to the steam and hot gas may be varied to conform to different cooking procedures, and means for inverting the cans during their passage through the cooker. Open fish-filled cans introduced by a feed conveyer 21, Fig. 1, are carried by a chain belt conveyer 22 through a hot air tunnel 23, are inverted on to a draper chain conveyer 28 by a wheel 26 within a hot air chamber 24, are carried inverted through a steam chamber 29 to a further hot air chamber 32 wherein they are restored to their former upright disposition, and are carried by a conveyer 34 through a further hot air tunnel 37 to a discharge conveyer 38. The cans are generally deflected on to the conveyer 22 by a spring deflecting arm 255, Fig. 10, but if the feeding is obstructed by cans already on the conveyer 22, then arm 255 rotates clockwise against the spring 257 enabling cans to be taken to the further, unoccupied part of the conveyer. Processed cans discharged off conveyer 34 pass in turn over three conveyers 266, 267 and 268 operating at progressively increasing speeds. The cans (particularly in the case of rectangular cans) are aligned on the fastest conveyer 268 by a singulating unit 291 consisting essentially of two mutuallyrotating wheels 304 and 306 having resilient can-contacting surfaces. The cans are inverted upon conveyer 28 by a wheel 26, Fig. 3, having sprockets in driving engagement with the roller chains 71, Fig. 5, of the conveyer, while the draper 72 rides along and is supported by the outer rings 202 of the wheel. The spaced links of the draper are resiliently connected to the adjacent chains 71 by pins 74 around which a compression spring 81 is positioned. The weighted take-up roller 47 pivoted about shaft 56 and springs 59, Fig. 3, permit the automatic movement of the conveyer 22 toward or away from the wheel 26 when handling cans of different sizes varying in length by, say, 2¢ inches. For greater variations, such as between ¢ inch and 5 inch cans, a further roller 47 is adjusted by raising angle members 351 normally held by bolts 352 in slots 353 and moving arcuate shoes 203, upon which the conveyer 22 rides, radially outward from the wheel and securing them in their slots 206. The baffles 129 and 134 disposed between the hot air chambers and the steam chamber are raised to accommodate the longer cans. The cans are preferably held upon the draper by a wiremesh conveyer 31, Figs. 1 and 3, whose shafts 104 and 105, Fig. 1, are adjustable relative to the draper by a pivoted lever 111, Fig. 6, having a spring-loaded detent 112 cooperating with an arcuate locking plate 114. On its return run the draper chain is cleaned of fish and oils by a rotary brush in a wash tank 211, Fig. 1. Normally, steam is admitted to the steam chamber 29 through an inlet 319a, Fig. 3, hot air heated by steam in heat exchangers 161 is circulated to twin blowers 167 and 171 (not shown in Fig. 3) down through the hot air chambers, smoke is introduced where required and adjustable baffles 141 and 146, Fig. 1, delimit the penetration of the hot air from the chambers into the hot air tunnels 23 and 37, respectively. However, in a modification described in detail with reference to Figs. 13 to 15 (not shown) the steam, hot gas and smoke are introduced selectively into the various chambers and tunnels or parts thereof according to requirements. In an operating example of the apparatus, fish in open fish-filled cans is pre-dried by hot air at 90F. being circulated at the rate of 3,000 cubic feet per minute, is cooked with steam at 200F. and is then pre-baked by hot air at 140F. being circulated at the rate of 3,000 cubic feet per minute. In this final stage oil may be added for frying the fish.