The micro-filming apparatus comprises an object table, a camera head arranged above said table, a frame pivotally mounted on said table, a glass plate and mounting therefor mounted on said frame, said glass plate being capable of movement perpendicularly of the plane of the frame to adjust the distance between the object and the film, setting sliders mounted on said frame movable between first and second positions, a handle attached to said sliders by which movement between said two positions is effected, and coacting means arranged between said sliders and the plate to effect perpendicular movement of said glass plate on movement of said sliders, wherein on movement of said sliders into the first position the lower surface of the glass plate is brought into the picture-taking plane and on movement into the second position the upper surface of the plate is brought into the picture-taking plane. In this manner vertical displacement of the camera head or object table is avoided which occasional photographing of single flat sheets of different thicknesses previously demanded.

BACKGROUND OF THE DISCLOSURE 
The invention relates to a micro-filming apparatus with camera head and an 
object table which comprises a carrier surface pivotable glass plate and a 
lower carrier surface spring-loaded towards the glass plate, while a 
handle is provided which can be shifted according to choice into a first 
and a second position and is coupled with a device which varies the 
distance between film and glass plate, by which device when the handle is 
set in the first position the lower surface of the glass plate is 
bringable into the picture-taking plane and when the handle is set into 
the second position the upper surface of the glass plate is bringable into 
the picture-taking plane (see D.D.R. Patent Application no. WP G 03b/196 
529). USSR 862875). 
PRIOR ART STATEMENT 
In a known micro-filming apparatus the original to be photographed is 
pressed under a hinge-down glass plate against a resiliently yielding 
object table. This manner of holding the original flat in the 
picture-taking plane is indispensible especially in the case of books. In 
the case of the occasional photographing of single sheets which in any 
case are flat, the flat pressing by the hinge-down glass plate by 
alternate raising and lowering of the glass plate is likewise necessary in 
order to hold the single sheet correctly in the picture-taking plane by 
resting against the underside of the lowered glass plate. To avoid the 
time-consuming opening and closing of the glass plate even when 
photographing single sheets which in any case are flat, it has already 
been proposed to make the camera or the object table adjustable so that 
either the under side or the upper side of the glass plate is situated in 
the picture-taking plane. 
OBJECT OF THE INVENTION 
An object of the invention is to avoid the vertical displacement of camera 
or object table in the case of occasional photographing of single flat 
sheets. 
The object of the invention is the provision of a setting device directly 
for the glass plate, in order that the upper side or the under side of the 
latter may be brought according to choice into the picture-taking plane. 
SUMMARY OF THE INVENTION 
In accordance with the invention this is achieved in that the glass plate 
is mounted for movement perpendicularly of the plane of the frame in a 
pivot frame and is bringable according to choice into the said first 
position or the said second position by setting sliders which are movable 
parallel with the plane of the frame by means of the handle. The setting 
sliders are expediently mounted on the two side faces, lying 
perpendicularly of the axis, of the pivot frame in bolt-slot guides and 
possess setting cams which are in engagement with setting pegs of the 
mounting of the glass plate. Preferably it is sought to hold the mounting 
in the first position in abutment with adjusting screws of the pivot frame 
with the aid or return springs, and the mounting is raisable into the 
second position by the setting cams against the return springs of the 
adjusting screws. According to one advantageous embodiment the pivot frame 
can be retained firmly in the working position by a catch which can be 
brought out of engagement with the pivot frame by an electromagnet, and 
furthermore in the circuit of the electromagnet a switch is provided by 
which the said circuit is interrupted when the glass plate is in the 
second position. According to a further feature of the invention the 
setting sliders comprise further setting cams by which the glass plate is 
movable into a third position in which the glass plate is situated below 
the picture-taking plane by the dimension of thick flat originals. The 
setting sliders are advantageously fixable in every position defined by 
the setting cams, in relation to the pivot frame, by a detent spring 
engaging in detent notches.

DESCRIPTION OF PREFERRED EMBODIMENTS 
In a micro-filming apparatus (see FIG. 1) the object table 3 is mounted by 
means of columns 2 on the chassis 1. The carriers 6 for the lamps 7 are 
secured on the object table 3. The pedestal 8 on which the camera head 9 
is secured is rigidly connected with the chassis 1. The object lens 10 is 
directed towards the object table. 
The pivot frame 15 is mounted rotatably about the axis 5 in the object 
table 3 (see FIG. 2). The catch 26 holds the pivot frame 15 against the 
opening effect of spring 24. The catch 26 can be brought out of engagement 
with the pivot frame 15 by the electromagnet 27. The circuit for the 
energisation of the electromagnet 27 can be interrupted by the switch 28. 
The mounting 16 of the glass plate 4 is guided perpendicularly of the 
plane of the frame in the pivot frame 15 by means of pegs 14 and return 
springs 17 seek constantly to hold the mounting 15 of the glass plate 4 in 
abutment with the adjusting screws 19. 
On the two side walls of the pivot frame 15 which extend transversely of 
the axis 5 there are provided bolts 20 which extend into slots 21 of 
setting sliders 22 (see FIG. 3). The two setting sliders 22 are operable 
by means of the handle 18. Each of the two setting sliders 22 possesses 
setting cams 13u and 13o which cooperate with setting pins 23 on the 
mounting 16 of the glass plate 4 in such a way that the operation of the 
setting sliders 22 results in the raising or lowering of the mounting 15 
together with the glass plate 4. 
When the setting slider 22 is in the position as shown in FIG. 3 the 
setting pins 23 are situated opposite to the setting cams 13u, so that the 
mounting 15 as a result of the return springs 17 presses against the 
adjusting screws 19 and the lower surface 4u of the glass plate 4 is 
situated in the picture-taking plane 11 (see FIG. 5a). 
In order to locate the upper surface 4o of the glass plate 4 in the 
picture-taking plane 11 (see FIG. 5b), the setting sliders 22 are moved to 
the left by means of the handle 18 so that the setting cams 13o through 
the setting pins 23 move the mounting 15 with the glass plate 4 away from 
the adjusting screws 19 against the return springs 17. In this position 
the switch 28 is opened so that hinging up of the pivot frame 15 is 
precluded. When the switch 28 is closed the release of the catch 26 is 
possible by closure of the switch 29. 
According to the example of embodiment in FIG. 4 the setting sliders 24 
comprise further setting cams 13o' by which the glass plate 4 can be 
brought into the position according to FIG. 5c. This position of the glass 
plate 4 serves for the laying down of originals which are in any case flat 
but are thick. In order to fix the setting sliders 24 in the positions 
corresponding to the setting cams 13u, 13o and 13o', a detent spring 12 is 
provided which can engage in notches 25u, 25o and 25o' of the setting 
slider 24.