The Optical Magic Lantern Journal (January 1900)
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4 The Optical Magic Lantern Journal and Photographic Enlarger.
mechanism. Above the frames BB is arranged the spindle c, carried in the blocks p with adjusting screws F, attached to rods F sliding in standards a, fixed to side frames BB and provided with adjusting screws H. By this means the height of spindle c may be adjusted to accommodate the spools of film of varying diameter. Upon one end of the spindle c and
rotating freely thereon is placed the spool of |
film J, which is to be passed through the machine.
The film x passes from the spool 3 downwards through the gate L, which consists of a rectangular metal frame lined with plush; the gate closing over the film x in such a manner as to offer a slight frictional resistance to the downward motion of the film.
Behind the gate is arranged the shutter o,
consisting of a short metal tube with one end ;
closed and attached to the spindle r carried in
bearings in side frames BB. Openings are formed in the tube so as to retain preferably two equal segments opposite to one another. On rotating the shutter at a suitable speed the segments will intercept the passage of light through the apparatus for a short period, and twice during each revolution of said shutter. After leaving the gate the film, proceeding downwards, passes partly round the looping roller q, carried by the rocking arms R, which are mounted and move freely on the same spindle z that carries the drum x. The rocking arms R are actuated by the crank disc s, crank pin T, and connecting link vu. The crank disc s is attached to spindle v, revolving in bearings in frame w and side frame B, to which the frame w igs attached. From the looping roller q the film passes partly round the drum x, and is provided
with small holes y spaced at equal intervals | around circumferential lines on its periphery. —
The drum x is attached to spindle z carried in
bearings in side frames » and frame w. The film is held in contact with the drum x by means of a roller 1 driven by drum x, and provided with pins to work in the holes y of the drum x and engage with the perforations in the film.
The apparatus may be used for perforating films, as any unperforated film which is passed between drum x and roller 1 when they are revolving will be immediately perforated.
To perforate films, another roller is employed with projections specially made for the purpose, the said roller being arranged to take the place of roller r.
The roller 1 is mounted on the swinging arm 3, pivoted at 4, and kept against the drum x and film by a spring 5. A catch 6 is provided, which throws the roller 1 in and out of gear with the drum x. :
After leaving the roller 1 the film passes to a bobbin 7 which slides on and rotates with the spindle 8.
Motion is imparted to the apparatus through the driving spindle 9, revolving in bearings in side frame B and frame w. To this spindle 9 is attached the crank handle 10 and the toothed wheels 11 and 12. Wheel 11 drives toothed wheel 13, attached to drum spindle z, and wheel 12 drives the train of toothed wheels 14, 15 and 16.
Wheel 14 is attached to crank disc spindle v.
Wheel 16 is an idle wheel connecting wheels 14 and 16.
Wheel 16 is attached to shutter spindle r.
On the drum spindle « is fixed the groove pulley 17, driving the grooved pulley 18 by means of a suitable continuous spiral spring 19, stretched over both pulleys.
The grooved pulley 18 is attached to the spool core spindle 8.
On the shutter spindle p is fixed a grooved pulley 20 driving the grooved pulley 21 by means of a continuous spiral spring 22 stretched out over both pulleys.
The grooved pulley 21 is attached to a spindle 25 carried in brackets 24 fixed to side frames BA, spool core 25 slides on and rotates with spindle 23.
The spool of film 26 to be rewound slides on and rotates on the spindle 27, which is attached to the spindle c by means of the sleeve 28, and the rewinding is effected as hereinafter described.
The spool of film s is placed on spindle c, and passed through the apparatus to the spool core7,
On turning the handle 10 the various toothed wheels and spindles.on which they are fixed revolve.