Patent GB-1503891-A (GB)
Title: Floor controller for an elevator
IPC: B66B1/52
Filed: 1976-03-03
Abstract: 1503891 Controlling elevators HITACHI Ltd 3 March 1976 [5 March 1975] 08528/76 Heading B8L A floor controller 12 for an elevator car 2 serving a plurality of floors comprises a synchronizer 22 movable on a reduced scale in synchronism with the car 2, an advancer 30 movable in advance of the synchronizer for detecting a call and being stopped upon detection of a call and a differential system for moving a difference detector 36 in accordance with the relative distance between the synchronizer 22 and the advancer 30, the running speed of the car 2 being controlled in accordance with the position of the difference detector 36 which is driven in a selected direction at the time of generation of a call so that the advancer 30 is moved in advance of the synchronizer 22. The synchronizer 22 is driven along a guide 23 by a chain 20 passing over sprockets 16, 18, the sprocket 18 of which is driven from a pulley 8 around which a tape 6, driven by movement of the car 2, passes. The advancer 30 is driven along a guide 29, parallel to the guide 23, by a chain 33 passing over sprockets 31, 32 driven by associated sprockets 58, 60 driven by an endless chain 66 which extends from the sprockets 58, 60, over sprockets 62, 64, over sprockets 361, 362 on the difference detector 36 slidable along a guide 38 and around sprockets 26, 28 rotatable with the sprockets 16, 18. The difference detector 36 is driven between stops 42, 44 through a chain 56 attached thereto, from a sprocket 48 driven by a motor 46. In operation, when the elevator car 2 is signalled to travel up to the third floor, for example, from the first floor position shown the car 2 is moved upwardly and the motor 46 is thereafter energized to driven the difference detector 36 upwardly, whereby the advancer 30 is moved upwardly through the chain 66 by both the movement of the detector 36 and the movement of the synchronizer 22 through the sprockets 26, 28. The distance by which the advancer 30 is moved up by the motor 46 is the distance by which the advancer 30 leads the synchronizer 22. When the advancer reaches a position corresponding to the third floor an oscillator 301 thereon becomes opposite a third floor receiving unit 343 which is then actuated to de-energize the motor 46. By detecting at this point, the position of the difference detector 36, by means of a detector 40 and an oscillator 363 on the difference detector 36, the elevator speed deceleration is controlled and continues to drive the synchronizer 22 to the third floor where an oscillator 221 on the synchronizer 22 becomes opposite a third floor receiving unit 243 to de-energize the elevator car drive. During this decelerating movement of the car 2 and synchronizer 22, the difference detector 36 is moved back to its original position since the advancer 30 is locked together with the sprockets 31, 32, 58, 60. The stops 42, 44 limit movement of the difference detector 36 and cause the motor 46 to be blocked whereafter the distance between the advancer 30 and the synchronizer 22 is maintained constant until the desired floor is reached. In the embodiment of Fig. 3 (not shown) the differential system formed by the chains and sprockets of the above embodiment are replaced by a differential gear.