Link 1 rotates about fixed axis A and is connected by turning pair B to link 3 which has gear rack a meshing with pinion 4. Pinion 4 turns about fixed axis C and is rigidly attached to wiper blade 2. Rack a is held in engagement with pinion 4 by roller 5 which rotates about fixed axis D. When link 1 rotates, wiper blade 2 oscillates.
$2564$LrG,FD$