Nippon Kogaku's solution to the demands of the market at that time was this Nikomat ELW . Actually, there was already a plan to add automatic film winding mechanism to the Nikomat EL since the beginning of this project. But in order for the winding lever at the camera top not to rotate itself even when the film-advance lever is rotated from the camera bottom, it had to somehow link the two axles after separating the two. Also, there was a plan to provide a full-scale motor drive which releases from the outside, e.g., by rotating the shutter button axle from the camera bottom. But this idea was declined due to certain circumstance.
Different manufacturers make a distinction between a winder and motor drive one way or the other.
Nippon Kogaku distinguishes if it is possible to shoot the picture continuously or not. With this type of shutter, with reference to the charging, the film-advance axle cannot function by rotating in one direction only. It needs to be rotated both ways. Since the shutter of Nikomat FTN and Nikon F2 is mechanically controlled, the switch does not have to be turned ON at the time of shutter release. However, with the electronically controlled Nikomat EL , the shutter speed is not controlled if the power is ON, thus when the power switch is OFF, the shutter button is designed to be locked.