Abstract: During a maintenance inspection, an optical rope diameter measuring device is provided at a predetermined position along a path of a wire rope, rope diameter is measured at multiple measuring points while the elevator is driven in test mode, and diameter reduction at each measuring point is determined and stored as a first diameter reduction (S2_S6). During a subsequent maintenance inspection, rope diameter is similarly measured at each measuring point to determine diameter reduction constituting a second diameter reduction (S7_S11). Based on these two diameter reductions, the time at which diameter reduction will reach a predetermined threshold value is predicted for each measuring point, and the earliest time is displayed as a rope replacement time (S12_S14).

Abstract: An elevator car (1) which moves vertically along the hoistway is provided with a roller guide assembly (3) guided by a guide rail (2). The roller guide assembly (3) is provided with a horizontal fixing shaft (8) which is fixed to a base member (6) and rollers (5a, 5b, 5c) which are supported by the horizontal fixing shaft (8). The rollers (5a, 5b, 5c) are each provided with a roller outer circumference section (10), a rolling bearing (9), an annular rubber (11), and an inner cylinder (12). The configuration eliminates the need for a conventional spring or a conventional damper mechanism because the rubber (11) deforms elastically.

Abstract: An elevator car (1) which moves vertically along the hoistway is provided with a roller guide assembly (3) guided by a guide rail (2). The roller guide assembly (3) is provided with a horizontal fixing shaft (8) which is fixed to a base member (6) and rollers (5a, 5b, 5c) which are supported by the horizontal fixing shaft (8). The rollers (5a, 5b, 5c) are each provided with a roller outer circumference section (10), a rolling bearing (9), an annular rubber (11), and an inner cylinder (12). The configuration eliminates the need for a conventional spring or a conventional damper mechanism because the rubber (11) deforms elastically.

Abstract: A control apparatus for an elevator system in which a rotation speed of a drive motor for driving said elevator system in controlled by supplying a deviation signal obtained by comparing a speed signal of said drive motor including an induction motor with a driving pattern setting signal; said control apparatus comprising a time function generating circuit operated by means of retarding instruction signal supplied from the elevator and for generating a speed instruction output signal which decreases lineally to zero when a elevator cage approaches to a stop position in a distance of the elevator travelling, a correcting instruction circuit for supplying a correcting signal depending on an error signal of a drive motor or a speed instruction signal of said time function generating circuit, with respect to a reference speed signal, to said time function generating circuit.

Abstract: A control apparatus for an elevator system in which a rotation speed of a drive motor for driving said elevator system is controlled by supplying a deviation signal obtained by comparing a speed signal of said drive motor including an induction motor with a driving pattern setting signal; said control apparatus comprising a speed control circuit which includes a control amplifier, and is characterized in that a time constant value of the control amplifier is set to different values in constant running operation and in retardation control of the elevator. Additionally, said control apparatus is characterized that the time constant value in retardation control is set so as to make low a transient gain of said control amplifier, and further that a preselected bias is supperimposed to a time constant circuit of said control amplifier at an alternating point from a constant speed running to a slowing down of the elevator, in order to prevent the decrement of the transient gain.