Tension device for drive chain, method and escalator system using same

An escalator system, comprising

• a handrail band;
• and
• a handrail band drive system, comprising a drive chain mounted and rotated around a driving wheel and a driven wheel, a tension device for the drive chain and a handrail band driving wheel coaxially connected to the driven wheel,
• wherein the handrail band is pressed against the handrail band driving wheel and driven to circulate by a friction of the handrail band driving wheel, and
• wherein the tension device comprises a pair of pressing blocks, each of which is provided on one of outer sides of portions of the drive chain between the driving wheel and the driven wheel respectively, and the pressing blocks apply pressures to the portions so as to move them close to each other, and
• wherein the tension device further comprises a support assembly, secured on each of inner sides of the drive chain respectively on a bracket of the escalator so as to support the drive chain.