Patent GB-1374656-A (GB)
Title: Apparatus adapted for use in coveyor car control systems
Inventor: LUSTI J
IPC: B66B1/14
Filed: 1972-01-11
Abstract: 1374656 Conveyer car control OTIS ELEVATOR CO 11 Jan 1972 [21 Jan 1971] 1290/72 Heading B8L In a lift control system, control circuitry utilizing logic units, Figs. 3A-3H (not shown), having facility for extra input connections, is mounted on a plurality of interchangeable circuit boards, Fig. 16 (not shown), such that, upon omission of some circuit boards, such as GECL a, b, EGL, or GALC a, b, AGL, the cars may operate independently, or in a plurality of distinct grouped correlated modes. By interchanging circuit boards, a single car system may have its response to given conditions altered, or by rearrangement of circuitry on a given board, a car may respond differently to identical input signals to the board. Boards for each car, for individual car control functions, Figs. 1-4 (not shown), include boards for individual car switching in response to call registrations and the position of the car in the shaft which may be derived from a selector registering a position in advance of the actual position of a moving car, (Fig. 1); boards for car door control (Fig. 2); boards to establish and maintain a signal defining the derived travel direction, to develop start signals, to cancel hall and car calls, light hall lanterns and indicate the existence of upper or lower hall calls, (Fig. 3); circuitry to protect against undue delay at a landing, and to indicate failure of doors to open, (Fig. 4). Extra boards allowing change of door opening time (Fig. 5), or allowing a fully laden car to by-pass hall calls (Fig. 6) may be provided for each car. Boards of Figs. 7A-7C (not shown) enable door, and hall call by-passing, control directly by an attendant.  Circuit boards individual to each car, providing control signals enabling group operation of cars, Figs. 8, 9 (not shown), provide for a zoning arrangement, operating "call above" or "call below" switches of a car in response to the existence of an unoccupied zone. Any car responds to hall calls in its own, or contiguous unoccupied zones, cars answering hall calls only if assigned. Unassigned cars answer only car calls, or move to an unoccupied zone answering intercepted hall calls. For each car, one circuit board for each car is provided for each three zones, such cards being duplicated as needed. Circuit boards applicable to a group of cars, Figs. 10, 11 (not shown), include an assignment enabling circuit board (Fig. 10) which can operate with up to eight cars, each of which can be allocated to any zone, no two cars simultaneously being, under normal conditions, assigned to any one zone. Circuitry of (Fig. 10), may also enable all zones to be regarded as unoccupied, all cars hence responding to all hall calls. A circuit board for each three zones (Fig. 11), identifies cars assigned to each occupied zone, and hall calls registered in each zone. Mechanical, or electronic touch button, hall call registering devices, Figs. 12A-12C (not shown) include triacs as call registering devices. Circuitry for three landings is included on each circuit board. Similar circuitry is provided for electronic or mechanical car call registration, Figs. 13A-13D (not shown), with four landings per circuit board. Further group operation circuit boards, Figs. 14, 14A, 14B (not shown) enable a zone to be regarded as unoccupied, whether or not a car is in it, if the number of calls in the zone exceeds the average number of calls per zone by more than a predetermined amount, one board handling six zones, as does the board of Fig. 15 (not shown) indicating if a car located in a zone is assigned thereto.