Round eccentric 1 with shaft 8 rotate about fixed axis A. Point B is the geometric centre of eccentric 1. Washer 3 encircles eccentric 1 and has four teeth b which mesh with pins 4. Pins 4 rotate freely about fixed axes E. Washer 6 is rigidly attached to driven shaft 2 which rotates about axis A. Washer 6 has pins 7 which rotate freely about axes D of washer 6 and roll around inside round holes 5 in washer 3 with their centres at points C.The dimensions of the links comply with the conditions: A͞B=D͞C and B͞C=A͞D, i.e. figure ABCD is a parallelogram. When eccentric 1 rotates about axis A, washer 3 meshes with pins 4 and thereby drives shaft 2. The transmission ratio from shaft 8 to shaft 2 is i=(z₄-z₃)/z₃ where z₄ is the number of pins 4 and z₃ is the number of teeth of washer 3.
$2593$PG,ML$