Wiper device for cleaning a vehicle window and method for fastening a wiper arm on a wiper shaft

The invention relates to a wiper device (100; 100a) for cleaning a vehicle window (1), with a wiper blade (10) arranged on a wiper arm (20; 20a), wherein the wiper arm (20; 20a) is fastened in a torque-proof manner on a wiper shaft (5) by means of a clamping piece (22; 22a), wherein a toothing region (15) is formed between the clamping piece (22; 22a) and the wiper shaft (5), wherein to form a clamping connection the clamping piece (22; 22a) cooperates with a clamping screw (27) which is arranged in a direction perpendicularly to the axis (2) of the wiper shaft (5), and wherein the wiper arm (20; 20a) is able to be fixed by means of the clamping piece (22; 22a) at differing distances from the vehicle window (1).