Movable guide for transmission device

A movable guide for a flexible transmission medium comprising an elongated synthetic resin guide body, said guide body including a shoe having a front surface arranged to contact a transmission medium and a back side, and a plate-receiving portion provided on said back side of the shoe and extending along the longitudinal direction of the guide body, said plate-receiving portion having a rearwardly facing surface facing away from said shoe and a plurality of slots also extending along the longitudinal direction of the guide body and having openings in said rearwardly facing surface, said openings also facing away from said shoe, said movable guide having a mounting hole adjacent one end thereof, said hole extending along a pivot axis transverse to the direction of elongation of the guide body, and said guide also including a reinforcing structure comprising a plurality of reinforcing plates respectively fitted into said slots and arranged in parallel to one another along the longitudinal direction of the guide, said reinforcing structure extending outwardly from said slots, beyond the rearwardly facing surface of the plate-receiving portion in said direction facing away from the shoe, at least at a location remote from said one end of the guide, whereby the reinforcing structure can contact the plunger of a tensioner cooperating with said guide at more than one location on said plunger, along a line substantially parallel to said pivot axis.