Improvements in Consecutive View Apparatus.
Year: 1899

page_text: Date of Application, 31st Oct., 1899-Accepted, 16th Dec., 1899
COMPLETE SPECIFICATION.
Improvements in Consecutive View Apparatus.
7
I, ELIAS BERNARD KOOPMAN, of 18 and 19, Great Windmill Street, near
Piccadilly Circus, London, Manager, do hereby declare the nature of the said
invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:-
My invention relates generally to improvements in consecutive view apparatus,
such as employ a flexible picture strip oi film, and relates particularly to improve-
ments in mechanism employed for varying the rate of feeding of such picture
strip or film.
My invention consists in the novel means employed for varying the rate of feed-
ing of the picture strip or film.
The objects of my invention are, to improve the devices employed for vaiving
the rate of feeding of films or picture strips in consecutive view apparatus, and
to render the same as simple and inexpensive as possible
These objects ano attained in the invention heien described and illustrated
in the drawings which accompany and form a part of this specification, in which
the same reference numerals indicate the same o coresponding parts, and in
which
"
Figure 1 is a vertical longitudinal section of a consecutive view apparatus
constructed in accordance with my invention, the section being taken through the
optical axis; and Figure 2 is a detail horizontal section of the apparatus.
18 a
In the drawings, 1 18 the outer case of a consecutive view projecting apparatus,
2 the objective lens thereof, 3 a light opening in the rear of the case concentrie
with the optical axis, and 4 a shelf (the greater portion of which has been
broken away), upon which a suitable projecting lantern may be placed
5 18 a
supply reel, revolubly mounted, from which the film may be drawn, and
winding up ieel, likewise revolubly mounted. 7 is a guide pulley, 8 is a support
located tianaveisely of the path of the rays of light, but having an opening for
the passage of light, and 9 is a spring-pressed frame, surrounding the light open-
ing in the plate 8 and tending to press against said plate The fiame, therofoie,
serves to hold the film steady while being exposed, and to offer some slight
fiictional resistance to the passage of the film across the optical field.
10 and 11 are two segmental feeding rollers for feeding the film forward inter-
mittently The major portion of the face of each of these rollers is cut away, as
shown, leaving a working surface extending through only a portion of the cir-
cumference Roller 10 is mounted upon and keved to a shaft 12, and roller 11
18 mounted upon and keved to a shaft 13 Shaft 13 18 duven from shaft 12 bv
means of two spiral gears 14 and 15 Gear 14 18 fast upon shaft 12, but gear 15
18 laterally movable upon shaft 13, transmitting motion to said shaft by means of
a key 16 Gear 15 has a grooved hub engaged by a yoke 17 mounted upon a
rock shaft 18, which projects through the front of the case 1 and is provided
with an operating handle 19.
The shaft 12 18 the driving shaft of the apparatus
from shaft 13 by a shutter shaft 21 and suitable
A shutter 20 is driven
bevel gears
A bolt 22

page_text: runs over a pulley 23 on shaft 12 and over a pulley 24 loosely mounted upon
the shaft 25 upon which reel 6 18 mounted This shaft is driven from pulley 24 by
means of an adjustable frictional diving device 26, which permits pulley 24 to
slip upon shaft 25 when all slack in the hlm has been taken up.
In order to prevent the stiain upon the film produced by the tendency of the
reel to evolve, fiom causing motion of the film through the field of the
apparatus to occur during the intervals of exposure, when the film should be
absolutely stationary, the film is passed about a series of snubbing posts 27 which
suffice to prevent the strain of the winding up reel from reaching that portion of
the film which passes through the optical axis
The operation of the apparatus is as follows
When shaft 12 18 1evolved rollers 10 and 11 are also revolved, 1oller 11 being
driven from shaft 12 through geais 14 and 15
The film is drawn intermittently
from the reel 5 across the optical axis, and 19 wound up on the reel 6, which
slips whenever the film is drawn taut If it be desned to vary slightly the
feeding of the film so as to make the successive pictures on the film register
accurately with the exposure opening, the handle 19 may he moved m the one
direction or the other according as it is desned to make the film move more
apidly or more slowly The effect of such movement of the handle 19 18. to
move gear 15 laterally with respect to gear 14. thus moving the segmental
roller 11 backward or forward, as the case may be, with respect to its companion
1oller 12, that is to say, by moving the gear 15 upon its shaft, the roller 11 18
given a certain amount of angular advance (positive and negative) varying with
the position of the gear 15 The effect of varying this angular advance is to
var the length of the period in each revolution of the two rollers 10 and 11,
during which both are in contact with the film, thus varying the length of film
fed forward at each revolution of said rollers.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is.
1. In a consecutive view apparatus, the combination, with shaft provided
with segmental feeding rollers adapted to contact with a picture stup or film
passing between them, of means for giving one of said rollers angular advance
with respect to the other roller, thereby varying the duration of the period of
Joint contact of said rollers with the strip or film, substantially as desciibed
2 In a consecutive view apparatus, the combination, with shafts provided with
segmental feeding 1ollers, adapted to contact with a picture strip or film passing
between them, of intermeshing spial gears mounted upon said shafts, and means
for moving one of said gears laterally upon its shaft, thereby advancing one of
said rollers angularly with respect to the other, substantially as described
3 In a consecutive view apparatus, the combination, with parallel shafts pro-
vided with segmental feeding rollers, adapted to contact with a picture stip o
film passing between them, of intermeshing spiral geais mounted upon and con-
nected to said shafts, and adapted to transmit power from one shaft to the
other, and means for moving one of said gears laterally with respect to the
other, thereby advancing one or said 1ollers angularly with respect to the other,
substantially as described
1
1000