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142 Transactio7is of S.M.P.E., Vol. XIII, No. 37, 1929
indispensible attributes of perfect registration, forward and backward movement and an as complete as possible elimination of friction upon the surfaces of the film, in order to avoid the evils of scratches and abrasions.
The mechanism being described in this paper is the latest contribution of the Bell & Howell Company to the Motion Pictures Industry.
In order to simplify its description, we shall consider one after another its principal parts, namely: The Film Channel The Film-feeding fingers The Registration fingers and conclude with a brief description of features of general interest, such as the lubricating system and the general assembly of the mechanism.
THE FILM CHANNEL : The film channel can be divided into three main sections, an upper and lower curved sections each having a radius of I14 inch and a central plane section.
FILM CHANNEL FILM FEEDING FINGERS IN ic OUT CONTROLLING CAMS CAMS ROLLERS FEED FINGERS CONNECTING ROD INfcOUTCONTROLLINCr LEVERS g REGISTRATION FINGERS h "OPERATING LEVER
I LEVER CONNECTING ROD
j ROLLER & SPRING CONNECTION K REGISTRATION FINGERS SPRING L PIVOTING POINTS.
SCHEMATIC DRAWING
HIGH-SPEED SILENT INTERMITTENT MOVEMENT MECHANISM
Figure 5. Schematic drawing of the new B. & H. high sx^eecl speed intermittent movement mechanism.
Figure 5 shows a schematic drawing of the mechanism plainly illustrating the above mentioned essentials, Film channel, Film-feeding fingers and registration fingers.
The film-feeding fingers operate in the upper curved section,