DE1006257B - Cinema camera with a change gear to change the frame rate - Google Patents

Description

GERMAN

The invention relates to a cinema camera with one connected between the power source and the camera mechanism Change gear for changing the frame rate.

There are cinema cameras known in which a power source and the camera work a. Change gear is switched on to change the frame rate. However, these known transmissions are only two-stage.

The invention differs in that a change gear is provided which according to the invention is designed so that the camera either continuously with any gear stage the power source can be coupled or only via a single structurally predetermined gear stage during a Exposure interval can be coupled with the power source and the frequency of the exposure intervals any gear stage can be set,

This means that the camera can either be driven at any selected speed: continuously driven, or individual images can be switched in the camera, the frequency of the exposure intervals being freely selectable.

The change gear is preferably designed according to the invention so that its wheels in two circles are arranged on a ring. The inner wheels run continuously with the same direction of rotation, but at different speeds. From. these inner wheels can be driven by a around the axis of the Ring's swiveling tapping gear each time the desired one The drive speed can be transferred to the camera unit for any length of time.

After uncoupling the camera from the permanent drive, this can be done with a ratchet wheel a low one. Gear stage of the gearbox can be coupled to intermittent operation. the Switching operations of the ratchet wheel are controlled by an electrical switch-on and switch-off mechanism any gear stage controlled. The switching mechanism for the intermittent drive of the The camera work contains two switches. One switch is used to switch on a relay, if necessary Magnet switched on, which moves the ratchet wheel, so that a connection between the low gear stage and the camera work is brought about. The second switch switches after one has been transported Image the magnet again, so that the ratchet wheel to interrupt the drive of the camera work in. the rest position goes back.

Finally, a manually operated cross switch can also be installed between the two switches, and by actuating it between the images automatically switched from the gearbox at arbitrarily selected intervals. Pictures switched on or after switching off the automatic cinema camera with a change gear
to change the frame rate

Applicant:

R. Winkel G. mb H. Optical Works,
Göttingen, Königsallee 17-21

Claimed priority:

Exhibition of April 26, 1952 on April 26, 1952

opened International Photo and Cinema Exhibition

PHOTOKINA 1952 in Cologne

Dr. Kurt Michel, Aalen (Württ),
has been named as the inventor

Switchers' pictures at arbitrarily chosen times can be included.

The subject matter of the invention is in one embodiment shown in the drawing. It shows Fig. 1 a schematic representation of the change gear with the camera as a time-lapse gear and

Fig ¹ . 2 shows a schematic representation of the switching device with intermittent operation of the camera system.

A change gear transmission l _a is used to drive the camera work to l _c which is installed between the power source 3 and the camera. This change gear transmission _le is arranged in a circle on a ring 2. The smaller intermediate wheels l _b sit on the axles of the inner wheels l _c . The drive wheel 3 cooperates with an inner wheel l _c . The smaller wheel Ij, meshes with your outer wheel l _a, and in turn this run to the next inner wheel l _c and so on. In this way, the wheels l _c · in the same direction of rotation, but with ever-smaller speed by.

The power can be passed on from the wheels 1 _{c via a gear 4.} The gear 4 is part of a pick-up gear with the further wheels 4 _a and 4 ₆ . This tapping gear can be pivoted about the axis 5 of the ring 2. A worm _{wheel 4 C} , which works together with a worm 7, sits on the axis of the gearwheel 4 _6. The worm 7 drives the shaft 6, which drives the shaft 10 of the Katnerawerkes via the bevel gears 8, 9. The film transport rollers 11 are driven by this via worms and worm wheels, 12 is an associated gripper system.

609 868/240

Depending on the setting of the gear 4 with respect to one of the inner gears l _c , the camera work can with different; Speeds can be driven continuously and for any length of time.

There is also the option of driving the camera system in sections. The connection between the worm wheel 4 _C and the worm 7 is interrupted in a manner known per se and not shown.

For the. intermittent drive is provided on the shaft of the gear 4, an intermediate gear 22 _a . This meshes with another gear 23 _ß , which actuates a switch 13 via an eccentric 24 _a. 14 is an off switch. The two switches 13 and 14 actuate a magnet 15. This is switched on by the on / off switch 13 via a relay 17, if necessary. If the armature of the magnet 15 is attracted, the ratchet wheel 16 is displaced in the direction of arrow 26 against the action of a spring 25 _{via a linkage 15 fi.} The ratchet wheel 16 works constantly together with a gear wheel 23 ₆ , which actuates the eccentric 24 ₆ for the switch 14, and with another gear wheel 22 _& , which can set the shaft 6 to the camera work in rotation via a worm and a worm wheel 19, 21 is a transformer and 20 is a. Cross switch that can be operated by hand.

The mode of operation of this intermittent drive is as follows: After the aforementioned uncoupling of the worm 7 from the permanent drive, the gear 4 is again brought into engagement _{with one of the inner gears l c.} This sets the frequency of the exposure intervals.

On the gear 4 and the gears 22 _Ö and 23 _a as well as the eccentric 24 _a , the on switch 13 is actuated. If the circuit is closed by this, the ratchet wheel 16 is shifted via the magnet 15 so that it comes into engagement with a gear wheel 18. The gear 18 rotates continuously at the speed of the gear stage 1 /. As soon as the gear wheel 16 comes into engagement with the gear wheel 18, it is set in rotation and drives the gears 22 ₆ and 23 _& . The gear 22 ₆ acts on the worm 19 and via this on the shaft 6. The gear 23 _& actuates the eccentric 24 & and via this the off switch 14, so that the magnet is de-energized again after an image has been transported. Under the action of the spring 25, the ratchet wheel 16 returns to its rest position, and the drive of the shaft 6 via the worm 19 is stopped until the magnet 15 is again excited by switching on the switch 13. This switching process brings the film to a standstill between two shots and, after the interval set on the gearbox has elapsed, it advances by one frame.

The device according to the invention allows many possible uses in movie recordings. It is particularly suitable for scientific recordings,

Claims (5)

Patent claims: 1. Cinema camera with a change gear connected between the power source and the camera mechanism to change the frame rate, characterized in that the change _{gear (l a} to l _c ) is designed so that the camera is constantly connected to the power source _{either via any gear stage (l c)} 3) can be coupled or can only be coupled via a single structurally specified gear stage (1 /) during an exposure interval with the power source (3) and the frequency of the exposure intervals can be set using any gear stage (l _c ). 2. Cinema camera according to claim 1, characterized in that the wheels (l _a , I ₆ , l _c ) of the gearbox are arranged in two arcs on a ring (2), the inner wheels (l _c ) continuously with the same direction of rotation different speeds, of which the desired drive speed can be transmitted to the camera unit (6 to 10) as required _{by a pick-up gear (4 a} to 4 _C ) that can be pivoted about the axis (5) of the ring (2), 3. Cinema camera according to claim 1, characterized in that after uncoupling the camera from the permanent drive the work via a ratchet wheel (16) with a low gear stage (1 /) of the change gear can be coupled intermittently, the switching operations of the ratchet wheel (16) over an electrical switch-on and switch-off mechanism (13, 14) can be controlled by any gear stage (l _c). 4. Cinema camera according to claim 3, characterized in that the switching mechanism for the intermittent drive of the camera mechanism contains two switches (13, 19), one of which is a switch (13) if necessary, switches on a magnet via a relay (17), which moves the ratchet wheel (16), soi that there is a connection between the lower, gear stage (1 /) and the camera, while the second switch (14) after a picture has been transported, the magnet (15) switches off again, so that the ratchet wheel (16) returns to the rest position for the purpose of interrupting the drive of the camera system. 5. Cinema camera according to claim 4, characterized in that between the two switches (13, 14) a manually operated cross switch (20) is installed by actuating it between the pictures automatically switched from the gearbox according to arbitrarily selected Pictures switched on at intervals or pictures closed after switching off the automatic switch-on arbitrarily chosen times can be recorded. Publications considered: German Patent Specifications. No. 563 024, 841 266; U.S. Patent No. 1,898,675. 1 sheet of drawings © 609 868/240 4.57