Patent GB-649424-A (GB)
Title: Improvements in or relating to a device and method for extracting bread and the likefrom baking pans
IPC: B01D47/02
Filed: 1948-10-22
Abstract: 649,424. Endless-belt conveyers ; tipping apparatus. PURITY BAKERIES SERVICE CORPORATION. Oct. 22, 1948, No. 27515. Convention date, July 3. [Classes 78 (i) and 78 (iv)] [Also in Group VI] A device for extracting bread &c. from baking pans comprises a pan embracing frame mounted for rotation about a horizontal axis, means for rotating the frame and simultaneously jarring the pans to loosen the bread, and means for controlling the passage of pans into the frame in accordance with its position. The pans 12, Fig. 3, are delivered by a conveyer belt to a structure 15 on the top of which are mounted a frame 16 and a series of rollers 31, Fig. 4. The shaft 17 to which the frame is secured is connected by a crank-arm 54 to the piston rod 53 of a double-acting pneumatic cylinder 18. When this is actuated the frame moves from the position shown in Fig. 3 to that shown in Fig. 4 and back again. During the upward movement the pans rest on guides 23, 24 and are jarred to dislodge the loaves by falling from the bottom of the frame to the top. The loaves fall on to a bar 25 which directs them base downwards on to a shoot 22 leading to a delivery conveyer 13. During the passage of the pans from the conveyer on to the rollers 31, they are moved sidewise by an adjustable guide 33 to ensure that the front edge of the first pan comes into contact with a roller trip 34, Fig. 5, actuating the switch 19 controlling the operation of the cylinder 18. This switch is mounted adjustably on the structure and has a spring return actuated by a wedge and a lifting finger 65 on the crank-arm 54. This switch actuates a solenoid 55 which is connected by a bell-crank lever 56 to the slide valve 57 controlling the supply of fluid to the cylinder 18. The tongue 36 of a latch mechanism 21, Fig. 7, projects upwards into the path of the pans. The latch is pivoted to the structure 15 and one of its arms is acted on by a spring 39 anchored to the structure while the other is engaged by a cam 38 mounted on the shaft 17. The tongue 36 is bolted to the supporting arm in order that it can be replaced by others to suit various pans. The frame 16 consists of telescopic end sections 42, 43, which are adjusted to suit pans of different widths and are secured to the shaft 17 by shaft couplings 44, 45 rigidly attached to counterbalances 51, 52. The bar 25 is adjusted vertically by screws 66, 67 and horizontally by loosening the wing nuts 74, 75 and moving the bars 73 supporting the screw housings 68, 69. When the front edge of a pan strikes the roller 34, the switch 19 is opened, the solenoid 55 is de-energized and the slide valve 57 is moved to allow air to pass through the pipe 58 into the cylinder 18 to cause rotation of the shaft 17 to move the frame 16 from the position shown in Fig. 3 to that shown in Fig. 4. When the frame reaches its extreme position, Fig. 4, the finger 65 pushes the wedge upwards against the trip of the switch and the circuit is completed, valve 57 reversed and the shaft 17 turned back to its original position. During the movement of the frame, the empty pan slides outwardly, so that when the movement ends, it lies against the outer end of the frame and is clear of the roller 34 when it is pushed out of the frame by the incoming pan. As the frame moves upwards, the tongue 36 of the latch mechanism 21 moves to the position shown in dotted lines, Fig. 7, to prevent movement of subsequent pans. The tongue is withdrawn as the frame returns. In a modification for dumping simultaneously two pan sets, two rotating frames are employed and the latch controlling the entrance of the pans is lowered only when the light falling on two photo-electric cells is cut off by two different pans, one in each of the pan sets.