The Central (later Fuji Central), Tokiwa and CINEFORWARD standard projectors all are based on the Central F-1 system. In fact, the Central F-1 system was a partial copy of the AEG Euro-M2 system. They have added minor modifications by time.
1 – Vertical gear (connected to 4; having a key slot inside * not shown)
2 – Cam drive gear (connected to 4)
3 – Cam (locking)
4 – Intermediate gear (connected to 2)
5 – Fork driver (connected to 6)
6 – Fork rack (connected to 5)
7 – Fork (moving 1 up and down)
8 – Intermittent movement (mechanism housing)
9 – Follower
10 – Follower lever
11 – Sleeve
12 – Framing pinion gear
13 – Starwheel (aka Maltese cross)
14 – Starwheel shaft
15 – Cam shaft
16 – Gear train shaft (rotating 1 via a key attached outside * not shown)
17 – Bearing (starwheel)
18 – Flywheel
This central framing system enables to sync between the intermittent movement (8) and cam (3) position while the movement turns (in either direction) by the framing knob, thus keeping the position of the starwheel (13) and cam the same. For this reason, there is no need for compensating the shutter, too, e.g. eliminating the out-of-phase on screen (travel ghost/image smear).
In brief, all parts remain at the same time on the move, changing only the angular position of the individual parts. (see below for more)
The knob should be always in the middle position, so that, in case of need, it could quickly move up and down the framing mechanism.
The thrust washer 1 (O-ring) is unified with the starwheel and machined together with starwheel, as well as the diameter of the part 2 between that washer and wheel is rounded and made larger in later modification.
This system is based on keeping the starwheel and cam position exactly the same while framing, so no shutter out-of-phase occurs. The entire intermittent mechanism rotates around the center line of the starwheel.
When the framing knob is turned, the intermittent movement turns the same way, so the connected A gears move and the adjust rack (fork) goes up-and-down according to the direction, the adjust rack moves the connected B gears, by doing this, every movement, that the intermittent movement does, is transferred to the position of the starwheel and cam precisely in-sync.
The gear locating in the midst of the fork is an intermittent drive helical gear with keyway.
This is one of the central framing systems.
The cylindrical drum shutters were fitted in TSS and TSR series until 1985.
The cylindrical drum shutters were replaced with the conical ones in 1985.
For more detailed engineering information, please visit the Common Central Framing Mechanism Forms of Chinese Film Projectors.