1. * GB780000 (A)
Description: GB780000 (A) ? 1957-07-24
Improvements in or relating to roll-film photographic cameras
Description of GB780000 (A)
PATENT SPECIFICATION
780,000 Date of Application and filing Complete Specification June 3,
1955.
/& % r M 9 No. 5462157.
Application made in Germany on May 6, 1955.
(Divided out of No. 77?,999).
Complete Specification Published July 24, 1957.
Index at acceptance -Ciass 98(1), A2C(8: 12).
International Classification 3GOb.
COMPLETE SPECIFICATION
Improvements in or relating to Roil-Film Photographic Cameras We,
KAMERABAU-ANSTALT, a Body Corporate organised under the laws of
Liechtenstein, of Haus Obera, Altebachstrasse 534, Vaduz,
Liechtenstein, do hereby declare the invention, for which we pray that
a patent may be granted to us, and the method by which it is to be
performed, to be particularly described in and by the following
statement:-
This invention relates to roll film photo:
graphic cameras in which an operating member serves in operation to
permit coupling or uncoupling of a shutter winding mechanism and a
film transport mechanism, thereby allowing double exposures to be
made.
In our Application No. 16013/55 (Serial No.
779,999) of which the present application is a divisional application,
there is described and claimed a roll film photographic camera having
a rotatable operating member coupled to a shutter winding mechanism,
and a film transport mechanism, said operating member serving in
operation in conjunction with a blocking means, to permit said
mechanisms to be - coupled or uncoupled, said blocking means being so
arranged as only to permit uncoupling when the operating member is in

2. a predetermined position with respect to the camera.
Double exposures may be made with such a camera by shifting the
position of the operating member to effect uncoupling of the
mechanisms. The predetermined position of the operating member is such
that uncoupling can only be carried out after a complete feed movement
or before starting one, thereby avoiding the possibility of partially
overlapping images on an exposed film.
When a strip of film has been fully exposed and it is necessary to
rewind the film, usually the film present in the camera is of such a
length as to prevent a complete final feed movement. In the camera
disclosed in Application No. 16013/55 (Serial No. 779,999) however,
uncoupling can only take place after a complete feed movement, so the
difficulty arises that the coupling cannot be released in order to
rewind the film after an incomplete final feed movement.
It is one object of the invention to provide a [Price 3s. 6d.] roll
film photographic camera in. which uncoupling of film feed and shutter
winding So mechanisms is possible even after an incomplete feed
movement.
According to the invention, therefore, there is provided a
photographic camera having a shutter winding mechanism and a film feed
55 mechanism, selective coupling of the film feed mechanism to the
shutter winding mechanism being effected in operation by means of an
operating member, and a locking device which serves when the film feed
mechanism is 60 uncoupled after an incomplete feed movement of the
operating member, to prevent movement of the shutter winding
mechanism.
There will -now be described by way of example only, one preferred
embodiment of 65 the invention with reference to the accompanying
drawings, in which:Figure 1 is a vertical section of a camera
according to the invention, the film feed and shutter winding
mechanism being shown 70 coupled; Figure 2 is a perspective view of a
component of the camera; Figure 3 is a horizontal section taken along
line III-HII of Figure 4, in which however, in 75 contrast to Figure
4, the operating member is locked, and.> Figure 4 is a vertical
section similar to Figure 1, the film feed and shutter winding
mechanisms being uncoupled. so An operating member 1 for a shutter
winding mechanism and film feed is rigidly connected to a rotatable
member 1', for example by means of screws (not shown), and is
rotatable and adjustable in height therewith. In 85 the position shown
in Figure 1, the film feed and shutter winding mechanisms may both be
operated by member 1. This is effected by the transmission of a torque
exerted on the operating member 1 through a pin 5 to disc 3 which 90
is secured to the shaft 2, and to a freely rotatable gear 6. The
shutter winding is effected by a coupling with further transmission

3. members, not shown, at the lower end of the shaft 2. The film feed is
effected partly by a 95 sprocket wheel, likewise not shown, which is
780,000 driven by means of gears 6 and 7, and partly by a slip
coupling mounted directly on the shaft 2 in known manner.
A ball 10 with a compression spring 9 is S disposed in a bore 8 of the
rotatable member 1', so that the ball is urged by the spring into
cooperation with notches 11 and 12 in the shaft 2 to locate- two
different positions of the operating member.
Figures 1 and 4 show the position of the operating member 1 after a
complete film feed or shutter winding movement. This position is
secured by stops, not shown, which are only removed again in known
manner after actuating a shutter release member.
If the operating member 1 is raised in this position, in order for
example to carry out a double exposure, then the pin 5 is withdrawn
from the bore 14 of the.gear 6, so that upon subsequent rotation of
the operating member 1 tonly the shutter will be wound by disc 3 and
shaft 2. Means for securing the film position which have been
described in our Application No. 16013/55 (Serial No. 779,999), can
also become operative at the same time.
Simultaneously, a retaining or locking spring 15 is raised by a
transverse pin 13 located in the rotatable member 1', which spring is
introduced into a slot 20 of a sleeve 19, as shown in Fig. 3, the
sleeve 19 being rigidly connected to the camera body 21. The spring 15
resiliently embraces the sleeve 19 from the inside and outside. After
a complete feed movement, the position of the operating member is such
that pin 13 is below an angular lug 16 of the spring 15. The raised
iposition of the spring 15 is shown in Figure 4.
Figure 2 illustrates the retaining spring 15 in detail.
If on the other hand the operating member l is raised to a position
other than that which tit occupies after a complete feed movement, the
pin 13 does not engage the underside of the lug 16 of the retaining
spring 15. Thus the latter remains in the position shown in Figure 1,
so that its radially inwardly curved inner end 17 engages in a ratchet
18 of the rotor 1' and prevent any further rotation of the operating
member (Figure 3), although the film feed shutter winding mechanism
are disconnected.
A return movement of the operating member 1 from this position into
the coupling position of Figure 1 causes the ratchet 18 to release the
operating member. If the retaining spring has been raised in an
uncoupling movement, on a return movement of the operating member the
spring will be pressed downward by projection l. This return movement
can be effected in any position of adjustment 60 nf the operating
member 1. If pin 5 is not aligned with bore 14, the pin 5 compresses
spring 15 which urges the bottom end of the pin against the upper

4. plane surface of the gear 6 by a spring 22, until it again snaps into
the 65 bore 14 when rotating the operating member.
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