US1772774A - Cinema camera - Google Patents

Description

Aug. 12, 1930. E GOLDBERG 1,772,774

G INEMA CAMERA Filed Aug. 11, 1925 IN VENTOR' E/VHNUEL 6'01. 0 BERG mama Au 12, 1930 i o -S ATES, PATENT osncs GOLDBERG, OI DBESDEN, GERMANY, ASSIGNOR TO THE GISELLSCHAIT, OI DRESDEN, amm

MHICA,

exam CAMERA Application fled August 11, 1925, Serial No. 49,638, and in Germany September I, 1824.

It is known in hotographic apparatus to open the shutter 8y means of a time release after a period which can be set beforehand, so that the o erator can bring himself into the icture. ince cinematographic apparatus ave been ado ted also by amateurs, it is desirable also in t e case of these apparatus to take photographs by meansoftimereleases.

According to the invention, this can be 10 done by mounting in the interior of thecinematographic hotographing apparatus a time release. his arrangement has the advantage that the release cannot get lost and that no mani ulations are required, before In the photograp s are taken, for securing it, as

-.is the case in photographic apparatus. Moreover, the time release cannot get either damraged or forgottemduring the transportation of I e photographing cinematograph. The time release could be mounted in the apparatus independently of-the cinema driving gear, or also with a separate source of power, in such a manner, that it is driven by its driving gear. In this case, a separate sprmgwinding gear forthe time release is not necessary. The connection of the time release to the drivin gear of the cinematograph is then preferab y effected in such a manner that when required it can be disconnected from the cinematograph to driving gear. I

Inthedrawing: Figure 1 shows ingfront elevation the cinematograph drive with a built-in timerelease in its operating position, the casingbeing as: partly broken away p s .Figure 2 is an e arfied front elevation of therelease device of t e time release in the position; and 1 '40 the .tlme'release in'accord'ance with Figure 1,

parts being shown in section.

The toothed wheel a, which is driven by the source of. ppwerofthe] cinematogra h, is inengagement withthe teeth of a stop isk b with two;.diametrically opposite stop projec- .tions c 0,. The release lever d which'serves for exposure by hand, i. e. without the time release, an ages against the stop pro'ection c and can released by hand in wellown fashion and, if.p be held fast in this 1 ,8 is a fragmentary top plan view of .jection c, that is situated thereunder.

osition by a rotatable cam e. lhe operating nob f of the cam, which knob is located outside the casing, has a marking line 9 which indicates the position of the cam e at any particular time. The stop projection 0 of 66 the stop disk 6 is impeded by the nose h of the hinged lever 21, which is attached in such a. way as to be swung laterally to a rotatable toothed segment 7' (Fig.1) when exposures are to be made with the time release.

The teeth of the segment 7' engage with a gear wheel is (Fig. 3), to the shaftof which a ratchet l is attached. But on the same shaft there is also an additional disk m, loosely rotatable, on "which there is provided a pawl n which engages the teeth of the ratchet I when the latter turns in the counterclockwise direction. The disk m is likewise provided at its circumference with teeth 0 which engage with the ear wheel p on the shaft This shaft g furt er carries the esca ement wheel 1' of the esca ement a, with WhlCll there is connected the. alance t with the spiral spring u. This escapement resembles in general the quite well-known arrangement in clockworks with balances.

The hinged lever 1', under the influence of the spring '0 (Fig. 2 normally rests against a stop wand outside the range of the stop disk 6. If, however, the time release device is to be set in action, then, in order to prepare for this method, the shaft 3 which bears the milled disk-like knob a: and which is under. the influence of a. spring z,, and with it a in z, are turned by hand, counter to 'said spring 85 and in the clockwise direction'untilsaid' pin has pushed the nose h from engagement with the stop w. The shaft 3 thereupon, under the action of the spring, returns to itsnormal position. The spring 2', that is wound around the pivot of the toothed segment 7' throws the segment i upward atthe same moment;- and presses the nose It firmly against the r1?- escapement mechanism is shut ofi for this space of time by the awl n and ratchet Z 'which is driven by the gear wheel k and 'runs free in this direction of rotation.

If the release lever d is now released'by the cam c, then the mechanism 21,6, c 'c,,;con-

trolled by the eseapement k to a, runs down slowly until, after half a minute, for example, the projection 0 of the stop disk 6 slides off from the nose h of the hinged lever 11 and the unimpeded running-off of the mechanism for the exposure takes place.

The parts 7*, s, t, u have to impede the running down of the toothed segment 7', namely in this way, that the balance If, in its oscillatory movements which are brought about by the spiral spring u as in the case of an alarm clock, allows the escapement wheel 1* to run down step by step by means of the armature s. This mechanism remains in motion until the nose h of the toothed segment j slides oil from the stop projection 0 From that moment the driving spring mechanism with the toothed disk (1 runs down freely, since the stop lever or latch lever d is held fast in the forcedback position by the cam e of the turn knob 7. The mechanism from h to u, namely the time release, requires for its running down,

according to the dimensions of the gear wheels, a space of time of about to 1 minutei. e. from the moment atwhich, in consequence of the turning of the knob 02, the nose h of the segment j remains upon the stop projection 0 until it slides oil from it again and, pressed sidewise by the spring 12, engages upon the rest stop w where it remains until the next actuation of the knob 00. It is clear, therefore, that during this time the operator can get to his position for the picture group that is to be taken, before the film run- \fi, which is likewise driven by the driving mechanism a, commences. This run-o5 must commence at that time, since the stop lever (13, crowded to the side by e, f, g, is stationary, so that it cannot come into engagement with 0 and 0 The film run-ofi' comes to a stop again as soon as the winding up has run down. In the case of time release exposures the latter is, of course, to amount to only a few turns. If exposures by means of the time release, 1. e. motion pictures of oneself, are to be made,

- the operator winds up'the spring mechanism to such an extent as the scene to be taken requires (three turns of the winding crank correspond to one meter of film), turns the milled disk :22 at the upper surface of the spring mechanism in the clockwise direction until it strikes a, stop, releases it again, and places the eccentrically shaped knob j with the line 9 upward. By means of the latter, as described, the release lever d is brought Zrom the position which locks the motion picture mechanism at 0 and the time release can begin to function. After half a minute, for example, the motion picture mechanism is actuated, and in the meantime one has ample time to assume the position intended in the picture.

I claim:

1. A time-controlled release mechanism for cinematographic cameras, including in combination power means for operating the camera, a rotatable stop member, a driven element, an escapement mechanism for operating said driven element, a hinged lever carried by said driven element, a stop with which said hinged member is normally engaged, means to disengage said member from said stop and cause its engagement with said rotatable stop member, and manually controlled means normally engageable with said stop member to permit of the operation of said escapement mechanism and subsequent actuation of said power means.

2. A time-controlled release mechanism for cinematographic cameras, including in combination power means for operating tl camera, a rotatable stop member, a driv n element, an escapement mechanism for ope; ating said driven element, a hinged lever carried by said driven element, a stop with which said hinged member is normally engaged, means to disengage said member from said stop and cause its engagement with said rotatable stop member, manually controlled means normally engageable with Said stop member to permit of the operation of said escapementmechanism, said hinged lever be ing disengaged from said stop member after a predetermined length of time, and means for thereupon restoring said lever to engagement with said step.

3. A time-controlled release mechanism for cinematographic cameras, including in combination a casing, power means for operating the camera within said casing, a rotatable stop member, a driven element, an escapement mechanism for operating said element, a hinged lever carried by said driven element, a stop with which said hinged lever is normally engaged, a spring-controlled shaft having a portion projecting exteriorly of said casing and operable to disengage said lever from said stop and thereby cause its engagement with said rotatable stop member, and a manually operable lever within said casing normally engageable with said stop member and operable to release the same to permit of the operation of said escapemeni mechanism and subsequent actuation of said power means.

In testimony whereof I afiix my signature.

Professor EMANUEL GULDBERS.

Images