Patent GB-965263-A (GB)
Title: Improvements in or relating to conveyor systems
IPC: B65G47/50
Filed: 1961-06-21
Abstract: 965,263. Conveyer systems. BROOKHIRST IGRANIC Ltd. June 21, 1961 [June 21, 1960], No. 22425/61. Heading B8A. Articles such as letter trays for conveyance to selected sorting stations (not shown) may be selected from a desired one of a plurality of input conveyers 2, 4, 6, and delivered in a selected quantity to one of a desired number of output conveyers A, B, C ... Each conveyer A, B, C ... has a respective control panel CP1, CP2, CP3, on which the desired input conveyer may be selected by positioning a control D. The quantity of articles is selected by a control E. An add-subtract counter 14 (Fig. 2a) counts and registers the number of articles leaving an output conveyer 2, 4, 6 and recounts those articles as they enter one of the conveyers A, B, C. The delivery to the output conveyer in question is initiated by pressing a call button 10 (see also Fig. 2a). When a train of articles which has been released from an input conveyer, reaches a main conveyer section 38, a further order of articles may be initiated from one of the control panels. When articles are not available in a selected input conveyer, the order is registered and the articles are delivered to the desired output conveyer when they become available. When the number of articles in an input conveyer is insufficient to fulfil an order that is made for an output conveyer on a respective control panel, the articles that are available are delivered and the remainder of the order is cancelled and the system is conditioned for response to a further order. Means is provided for preventing erroneous delivery due to the effect of a power failure. In operation, if for example five articles are required to be delivered from conveyer 2 to conveyer A, the effect of pressing call button 10 (see also Fig. 2a) energizes a relay ICA from power lines L1, L2 and a call light ICL. Certain parts of the circuits of the control panels CC2 and CC3 which are identical to those of control panel CC1, are indicated merely by dotted lines in Fig. 2a. A stepping switch 46 rotates step-by-step until its moving contact closes on contact 1. For example if when power is switched on, the moving contact happens to be on contact 2 as shown, relay 52 is energized to close contacts 52a (via contact ICA4, closed by relay ICA). This energizes winding 46C of switch 46 and deflects switch operating member 46d against spring loading but without operating the switch. A switch 46e is disconnected by the energization of winding 46c and the consequent de-energization of winding 46c allows the spring loaded member 46d to move the switch members 46a, 46b one position. Relay 56 is now energized and the process repeats until the contact 46b arrives on contact 1. A number of spare contacts 46e are provided for the addition of further output conveyers and a contact L is provided for preventing contact 46b from recycling under certain conditions as described below. Switch 46 energizes through contact 1, a relay 48, a filling light 1FL on the panel CC1 and (since contacts ICA5 have been closed by relay ICA) relay 50. Relay 48 closes contacts 48a t energize coil 46c of the stepping switch 46 so   as to maintain a further stepping cycle of the latter. Contact 48b and previously closed contact ICA6 complete a circuit through the rotary contact of the lower ganged section of a type selector switch (see bottom right-hand corner of Fig. 2b) to energize the coil TS1 of an article stop TS1 (Fig. 1) to release the first article. The relay 50 closes contacts 50b which completes a circuit to the coil 14e of the add-subtract counter 14. This steps the counter 14 by one position from zero and a cam 14 of switch 14 acts to close switches 14a, 14b. Switch 14a energizes relay IDR which closes contacts IDR1 to energize the coil ID of a diverter DM1 (Fig. 1) which diverts articles on the conveyer 8 to the output conveyer A. Contact IDR2 energizes relay 44 to open contact 44a. This de-energizes the contact L of switch 46 to prevent re-cycling of the latter during delivery of the current order of articles to the conveyer A. When the first article engages a limit switch LS1 (Figs. 1 and 2a) contact 2 of the latter is closed to energize a relay 24 and a coil 26a of a counter 26). Contact 24a energizes coil 40e of a stepping switch 40 so as to step the latter one position. Similarly coil 26a causes stepping in an adding direction of counter 26. When the fifth article has energized switch LS1, the moving contact of switch 40 a circuit is established through the quantity selector switch (top left-hand corner of Fig. 2b) and contacts ICA2 and 50a (previously closed by relays 1CA and 50 mentioned above) to energize a coil 40f which deflects a holding pawl 40g to permit the switch 40 to return to position 0. As each article passes over a stop LS4 it energizes a coil 26b to rotate counter 26 in the " subtract " direction. As the first article passes over a switch LS5, a relay ICB is energized to in turn energize a relay IM which starts the motor M1 which drives the conveyer A. Relay ICB also closes relay maintaining contact ICB3. The article is diverted on to the conveyer A by DM1 (Fig. 1) and engages to temporarily close contacts 1 and 2 of switch LS8 (top right-hand part of Fig. 2a) to energize through the upper ganged section of the type selector switch, a counter 20 (this gives an indication of all articles delivered to the conveyer A from input conveyers 2 and 4). Contact 1 of switch LS8 also energizes the subtract coil of counter 14. When the fifth article has operated switch LS8, counter 14 has been rotated back to zero position thus (by its cam 14d) opening switches 14a, 14b. These de-energize relays ICA and IDR. Contact IDR1 de-energizes the coil 1D of the diverter DM1 (Fig. 1). Relay ICA interrupts energization of relay ICB and results in consequent shutting down of the driving motor M1 of the conveyer A. Contact 44a closes to reconnect contact L of switch 46 and permit the latter to commence recycling in anticipation of a further order. Delivery of a partial order.-If, for example, only four trays are available in conveyer 2 when the abovementioned order of 5 articles is placed. When the fourth article has disengaged switch LS1 relay 24 is de-energized and a circuit is completed through a relay 38. This opens a contact 38a (bottom right part of Fig. 2a) in a timing circuit. The latter maintains open, contact 38a. Since no further articles engage switch LS1 the timing circuit times out and contact 38a closes to complete a circuit for the resetting coil 40f of switch 40, and energization of a relay 42. The latter acts through its contact 42c to de-energize article stop TS1 (to stop further articles should they arrive on conveyer A). The articles are delivered to conveyer A and control circuit CC1 is restored to normal position as before. Storage of an order when no trays are available.-As no articles are released the timing circuit times out as described above and the system is restored to normal except that relay ICA and lamp ICL remain energized. This constitutes storage of the order. If a succeeding conveyer B or C has not placed a call following storage of the order switch 46 repeatedly rotates to contact 1 in order to attempt to deal with the order. Maintenance of correct count in event of power failure.-Presence of an article on switches LS1 -LS4 on the occurrence of power failure would result in a miscount on re-connection of the power. This is avoided by the arrangements of contacts 22a and 22b of relay 22 so that the article must move off the switch LS1-LS4 in question before relay 22 can again be energized. In a modification (Fig. 3, not shown) the counter 26 and switch LS4 and associated circuitry are replaced by a second timing circuit 70 similar to the timing circuit 27. The timing circuit 70 is set by further contacts of relay 42.