Opening and closing the door leads to No. 1 moving No. 2 to the left and to the right. This again turn No. 3 90° to one direction and back. That was design intend. However, as a little bit of plastic, which would have restricted the 90° turn, had broken off (see last 2 pictures). No. 3 could now turn a bit more than 90°. No.3 "operates" the micro switch in the next picture, which is mounted on the other half of the mechanism.