Wiper system

A wiper system for wiping off deposits deposited on a surface of a wiped member,

• the wiper system comprising:
• a pair of carriages attached to frame members holding the wiped member so as to face each other across the wiped member and moving back and forth over the frame members along two left and right facing sides of the wiped member;
• a pair of wiper arms respectively attached to the pair of carriages and extending from the frame member sides to the wiped member sides;
• a pair of wiper blades respectively attached to the pair of wiper arms, extending substantially parallel to the other two facing sides of the wiped member, and arranged at the surface of the wiped member;
• and
• an arm drive mechanism making the pair of wiper arms move in a direction away from the wiped member when the carriages move down to the lower side of the wiped member and making the pair of wiper arms which were made to move away from the wiped member move to the wiped member side when the carriages move up to the upper side of the wiped member,
• wherein the arm drive mechanism comprises:
• separation guide rails provided at the frame members at a lower side from the wiped member and mechanically guiding the pair of wiper arms in a direction away from the wiped member when the carriages have moved to the lower side of the wiped member,
• contact guide rails provided at the frame members at an upper side from the wiped member and mechanically pulling the pair of wiper arms which were made to move in a direction away from the wiped member to the wiped member side when the carriages have moved to the upper side of the wiped member, and
• variable arm angle mechanisms provided at the carriages for making the wiper arms rock about fastening shafts, provided for attaching end parts of the wiper arms at long direction frame member sides to the carriages, as centers of rotation within a predetermined angular range.