Patent GB-191228484-A (GB)
Title: Improvements in Continuously Operating Baking Ovens.
Inventor: KUEHTZ FRIEDRICH
IPC: A21B3/00
Filed: 1912-12-10
Granted: 1913-06-19
Abstract: 28,484. K³htz, F. Dec. 11, 1911, [Convention date]. Bakers' ovens.-Loaves of bread &c. are carried through an oven by an endless conveyer which travels first in a substantially horizontal direction, then downwards at an angle, and finally vertically back to the charging point, the three directions corresponding respectively with a high-temperature steaming period, an intermediate period of gradually falling temperature, and a high.- temperature finishing period. Arrangements are also provided for automatically withdrawing the trays with the finished goods, and returning them to the oven after an interval sufficient for clearing and reloading. As shown in Fig. 1, the goods are carried on trays 17 loosely supported on side brackets 18 pivoted to the links of the conveyer 19. Steam is supplied through a conduit 5 near the charging - opening 1, and is withdrawn through one or other of dampered openings 6, 7, 8, according to the desired duration of the steaming, the exhaust steam either passing to atmosphere, or being returned to the oven by an exhauster 9 through the flue 10. Additional openings 11, 12 for the escape of steam may be provided. The oven shown is heated by Perkins' tubes fired from a side furnace, which may have a travelling grate, but electrical or any other suitable heating-means may be substituted. The setting and withdrawing apparatus comprises rods 20, Fig. 4, each having, for a length equal to the width of a tray, flattened surfaces 21, 22, Fig. 13, of which the latter is nearer the axis of the rod than the former. The rods are inserted beneath a tray 17 with the surfaces 22 uppermost, are then turned through an angle of 90 degrees to lift the trays clear of the supports 18, and are finally withdrawn from the oven with the trays resting on the surfaces 21. After a sufficient interval, the movements are reversed, and the tray with a new batch is returned to the conveyer. The whole of these movements and the corresponding intermittent movements of the conveyer are controlled by a gear - wheel 37, mounted on a shaft 38, and driven by any suitable motor, the arrangements being such that a complete cycle of operations is performed for each complete revolution of the controlling-wheel. The conveyer is operated by a roller 42, Figs. 5 and 6, engaging a star-wheel 40 on the shaft 36, which is locked during the intervals between the motions by the reduced portion 43 of the controlling-wheel. The rods 20 are formed with racks 23, 24, and are reciprocated by pinions 26 on a shaft 25, operated in one direction by an interrupted gear 50, Figs. 5 and 10, and a pinion 49, and in the other by a complementary gear 55, and pinions on a parallel shaft 53. The gears 50, 55 have teeth for operating the shaft 25, surfaces 58 for locking the pinions during the various periods in which the rods 20 are at rest, and recessed portions 61 for allowing movement by the other gear. The axial movement of the rods 20 is obtained by segments 27, Fig. 13, having feathers 28 engaging grooves in the rods, and suitable levers and connecting- rods operated by a cam-groove 48 in the controlling - wheel. The rods are turned in opposite directions to prevent lateral movement of the tray. The door 33 is opened to allow the withdrawal and return of the trays by cams 66 acting through a lever 65 and intermeshing quadrants 64, 62.