Chain tension monitoring device (40) is configured for monitoring a chain tension force (F.sub.C) of a drive chain (27) extending in a longitudinal direction forming closed loop between two sprockets (26, 28). The chain tension monitoring device (40) comprises a sensor device (41) configured for mechanically contacting the drive chain (27), detecting movement of the drive chain (27) transversely, in particular orthogonally, to the longitudinal direction of the drive chain (27), and providing a detection signal indicating the detected movement of the drive chain (27); and an evaluator (50) configured for receiving the detection signal provided by the sensor device (41) and determining a chain tension force (F.sub.C) of the drive chain (27) from said detection signal.

Chain tension monitoring device (40) is configured for monitoring a chain tension force (F.sub.C) of a drive chain (27) extending in a longitudinal direction forming closed loop between two sprockets (26, 28). The chain tension monitoring device (40) comprises a sensor device (41) configured for mechanically contacting the drive chain (27), detecting movement of the drive chain (27) transversely, in particular orthogonally, to the longitudinal direction of the drive chain (27), and providing a detection signal indicating the detected movement of the drive chain (27); and an evaluator (50) configured for receiving the detection signal provided by the sensor device (41) and determining a chain tension force (F.sub.C) of the drive chain (27) from said detection signal.

The current disclosure relates to a power system for feeding power into a vertical transportation arrangement. The power system comprises a first interface for connecting to a primary power source; a second interface for connecting to a secondary power source; and power controlling means for controlling feeding of power from the primary power source and/or the secondary power source to a motor for driving a vertical transportation device. The power system is characterized in that the power controlling means is configured to control feeding at least some of the power used by the motor during normal operation from the secondary power source. The current disclosure also relates to a method and vertical transportation arrangements.

The current disclosure relates to a power system for feeding power into a vertical transportation arrangement. The power system comprises a first interface for connecting to a primary power source; a second interface for connecting to a secondary power source; and power controlling means for controlling feeding of power from the primary power source and/or the secondary power source to a motor for driving a vertical transportation device. The power system is characterized in that the power controlling means is configured to control feeding at least some of the power used by the motor during normal operation from the secondary power source. The current disclosure also relates to a method and vertical transportation arrangements.

Provided is a guide rail cleaning device, including: a first cleaning portion including a first cleaning member configured to clean a driving-roller guide rail for a step; a second cleaning portion including a second cleaning member configured to clean a trailing-roller guide rail; and a mounting plate. The mounting plate is removably mounted to a step shaft having a driving roller fixed thereto. The first cleaning portion and the second cleaning portion are mounted to the mounting plate. The first cleaning member is brought into abutment against the driving-roller guide rail. The second cleaning member is brought into abutment against the trailing-roller guide rail. With this, the driving-roller guide rail and the trailing-roller guide rail are simultaneously cleaned through use of the first cleaning member and the second cleaning member.

An escalator includes movable step segments. Each step segment includes a rectangular step plate with a constant height, a tread, and four corners. The tread of each step segment is in a horizontal position during a front transport movement and in an oblique position during a rear return movement. Four wheels which include two front wheels and two rear wheels are assigned to each step segment, with one wheel being mounted at each of the four corners. Two endless transport chains transport the two front wheels at a front transport section. Two first tracks have the two rear wheels run thereon without being attached to any of the two endless transport chains. Two rear second transport tracks are arranged in a rear return transport section. The two rear second transport tracks transport each step segment back with the tread in an oblique position via the two endless transport chains.

Provided is a guide rail cleaning device, including: a first cleaning portion including a first cleaning member configured to clean a driving-roller guide rail for a step; a second cleaning portion including a second cleaning member configured to clean a trailing-roller guide rail; and a mounting plate. The mounting plate is removably mounted to a step shaft having a driving roller fixed thereto. The first cleaning portion and the second cleaning portion are mounted to the mounting plate. The first cleaning member is brought into abutment against the driving-roller guide rail. The second cleaning member is brought into abutment against the trailing-roller guide rail. With this, the driving-roller guide rail and the trailing-roller guide rail are simultaneously cleaned through use of the first cleaning member and the second cleaning member.

A rail cleaning device for a passenger conveyor includes: a main body; a cleaning body; and a fastening band. The main body has a through hole. The through hole is arranged so that lower ends of link plates are located at an intermediate position of the through hole in a height direction of the main body when the cleaning body is held in abutment against an upper surface of a drive rail. The fastening band has a ring shape passing through an inside of the through hole and over outer sides of the link plates and extending to an upper side of the main body. The fastening band is tightened so as to press the cleaning body onto the drive rail by bringing an upper end of the main body close to the lower ends of the link plates, thereby fastening the main body to the link plates.

A conveyance belt (12) for a conveyor (1) comprises a plurality of cavities (26a-26c). Each of the cavities (26a-26c) is configured for form-fittingly accommodating a corresponding insert (24a-24f) for connecting the conveyance belt (12) with a conveyance element (20) of the conveyor (1).

A speed monitoring device and a passenger conveying device. The speed monitoring device includes a transmission rotor disposed on a shaft side surface of a shaft of which the speed is to be measured and rotating with rotation of the shaft of which the speed is to be measured; an encoder having an input shaft, the input shaft of the encoder being connected to the transmission rotor and rotating with rotation of the transmission rotor; and a mounting bracket for securing the transmission rotor and the encoder to a position where they are to be mounted.