C&W P6
The P6 was introduced 1937
This one No. 1066, the lowest known P6 is numbered 484, is in black gloss exterior blue/gray interior
Stand alone projector heads and mechanism only for the Raycophone J3 models
Flywheel side of the P6 shows the main drive gear contex bracket, and intermittent flywheel
The J3 projector is fitted with a Cummings & Wilson P6 projector head No. 603.
Raycophone J3 from the 1941 manual
J3 Sound head type 1, with a spring loaded input roller shoe
J3 Sound head type 3, shows a second input roller and ball bearing feed
C&W P6 No. 6.3 fitted to Raycophone sound head type 1
P6 still being assembled
The plating on the sound plate on No. 603 has unfortunately worn through in many places
The sound plate is first screwed to the base plate. The exciter lamp holder, the scanning aperture and the optical magnifying barrel are next fixed to the backing plate. The optical barrel and lens assembly at its small end projects an enlarged image of the sound track from the scanning aperture to the scanning slit.
The dark coloured band covering observation port at the slit end of the tube can be slid away to enable accurate focusing of the sound track on the scanning slit.
The three screws at the top of the plate are the fixing position of the roller assembly
First we fix in place the exciter lamp base and lamp to the sound plate.
The scanning slit at the end of the optical barrel permits only a very narrow image of the sound track to reach the photo electric cell.
The photo electric cell and its mount.
The photo cell and its holder is inserted into upside down
The light path from exciter lamp passes through its condenser, aperture plate, film, optical tube and scanning slit to photo electric cell.
The system, when correctly adjusted, focuses the actual sound track’s emulsion grains, putting the film base out of focus. This much improves the frequency response of the sound track.
The angle bracket and projector main plate is now attached to the top of the sound head.
The sound track can be seen at the scanning aperture. The screw at the right locks the condenser lens in best focus of the exciter lamps output at the aperture.
The left and right sound tracks in this film clip are clearly seen
The sound roller shoe with its sound track position adjusting screw is now ready to be attached to the plate. The large screw in the centre of the holder locks the adjuster in place.
The upper sound track roller and shoe assembly. The lower sound roller is at right.
Viewed from above, the shoe and shoe release lever is shown
The sound roller shoe is now mounted followed by the lower roller
Both rollers are free wheeling and their movement is independent of the main drive shaft. They are driven by the film passing over them. The lower sprocket and shaft provides the driving movement for the film through the sound head. Add light oil to the roller oil cups and spin them to check for free movement. This picture shows the main sound shaft already installed and piece of film loaded to check the movement.