日本からの映写機 Motion Picture Projectors from Japan

All about the Japanese Sound Projectors by Erkan Umut (Istanbul, Turkey) 笑流感 有無人 (イスタンブール、トルコ)

Technical corner

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.

aeg-euro-m2-vs-central-f-1-heads
AEG Euro-M2 (1944) vs. Central F-1 (1948) head mechanisms without sound unit or soundhead attached
AEG-M Intermittent Mechanism
AEG-M intermittent mechanism

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)

AEG-M framing
The fork 7 is not seen (see above figure).

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.

Cam compensation

Tokiwa TSR head (mechanism)
Tokiwa TSR head mechanism with the one head design (originally designed in 1958 as separated projector and soundhead)
TSS-TSR starwheel difference
Tokiwa TSS/TSR starwheel difference
Tokiwa TSS-TSR intermittent ass'y
Tokiwa TSR intermittent ass’y

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.

Tokiwa TSR intermittent ass'y
Tokiwa TSR intermittent ass’y
Tokiwa TSS TSR Framing (Cam compansated)
Tokiwa TSS/TSR cam compensated system

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.

Some parts have made by the old South Korean agent VISION SYSTEM CO., LTD. for the VAVISION projectors. They are copied from the imported Tokiwa equipment used in the TSS and TSR heads. The VAVISION projector models are based on the Tokiwa TSR designs.
Tokiwa TSS TSR cylindrical drum shutter
Tokiwa TSS/TSR cylindrical (drum) shutter

The cylindrical drum shutters were fitted in TSS and TSR series until 1985.

Tokiwa TSR-FN
Tokiwa TSR conical shutter

The cylindrical drum shutters were replaced with the conical ones in 1985.

FC_logo

Fuji Central F-6 mechanism side
Fuji Central F-6 head mechanism (A heartfelt thanks goes out to my friend Mr. Jason Smith, Morioka, Iwate-pref.)
Fuji Central F-6 mechanism (intermittent mechanism & main gear removed)
Fuji Central F-6 head mechanism (intermittent mechanism and main gear removed)
Fuji Central F-6 series shutter
Fuji Central F-6 series cylindrical (drum) shutter
Fuji Central F-V300AR head (mechanism)
Fuji Central F-V300AR head mechanism (Photo courtesy of Mr. Makato Nara)
Fuji Central F-V300 Series Intermittent Ass'y
Fuji Central F-V300 Series intermittent ass’y

Fuji Central F-V300 Series cam assy difference

Fuji Central F-V300 Series Shutter
Fuji Central F-V300 Series single-blade conical shutter

CINEFORWARD FCT-10 Projector head mechanism side
CINEFORWARD FCT-10 head mechanism side
CINEFORWARD FCT-10 STARWHEEL
CINEFORWARD FCT-10 starwheel
CINEFORWARD FCT-10 CAM & PIN
CINEFORWARD FCT-10 cam & pin
CINEFORWARD FCT-10 SHUTTER
CINEFORWARD FCT-10 conical shutter

For more detailed engineering information, please visit the Common Central Framing Mechanism Forms of Chinese Film Projectors.

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