US935167A - Driving mechanism for kinematograph apparatus. - Google Patents

Description

0. E0881. DRIVING MECHANISM FOR KINEMATOGRAPH'APPARATUST APPLICATION FILED JUNE 5, 1908.

935,167, Patented Sept.28,1909,

Fig.1 I Fig.2

TES PATEN CARLO ROSSI, or TURIN, ITALY.

DRIVING MECHANISM FOR KINEMATOGRAPH APPARATUS.

"To all whom it may concern."

Be it known that 1, Clinic ROSSI, a sub-' jcct of the King of Italy, residing at Turin,

ltaly, have invented a certain new and useful improved Driving Mechanism for Kinematograph Apparatus, of which the following is a specification.

V It is well known that in kineinatograph and like apparatus, it is necessary to bring about an intermittent driving of the band. or film, and that this can be obtained by means of reciprocating movement of two claws or the like engaging, during their operative travel, perforations in the edges of the film. i

Tliis iniention relates to a mechanism for driving a band or a film, and is particularly applicable to use in connection with any kind of kinematograph apparatus used,

proyecting or for exposing the either for which has special advantages as regards the uniformity and precision of the movement as well .as the wear of the edges of the perforations;

ii. construction of mechanism according to this inyention'ls illustrated by way of example 'in' the accompanying drawing in which Figure 1 is a side elevation, Fig. 2 a front.

elevationand Fig. 3 aplan. Fig. 4 shows the path followed by the points of the claws.

On a plate 1 provided with a groove 2 of rectangular cross-section in which the band 'or the film moves is mounted by means of abracket 3, a spindle 4 driven in any suitable manner. to which is keyed the crank-disk 5 controlling the connecting rod 6. The other end of the connecting rod is pivoted on a frame T' which is horizontally movable be-; ftweein guides This frame is provided in the center with a slot 9 of the shape shown there-mgr) be two, three orfour pairs in stead of one, are also secured to the twoends of a cross-bar 18, secured to a part 19 having the. shape of'a bend, the spindle 20 of which Specification of Letters Patent.

helical spring 27, for the ducmg constant motion and allowing for the corresponding Patented Sept. 28, 1909'.

Application filed June 5,1908. Serial No. 436,947.

can slide in the bifurcated end 21 of a lever 22 pivoted to the support or bracket 3, the

other end of the said lever carrying ahead or roller 23 engaging in the cam groove 24 60 inthe rim of the cranl-z-disk 5 (Fig. 3). In line with the tail 1st ofthe part 12 is mounteda stop held raised in its guide 26 by a purpose of prowear of the difierent parts, when the end- 0f the tail ltcoines into contact with the stop. The working of the mechanism will loe readily understoodfrom the above descripfl The drawing shows the frame 7 and-the tion.

part 12 in their central positions. If thecrank-disk 5 is rotated in the direction of the arrow (Fig. 2), the frame 7 will be moved toward the right by the connecting rod 6,

and the slot 9 will bring about the lowering of the head 11 and consequently of the part 12. As the extensions 16 guiding the claws 17 are secured to the part- 12, the claws are thus moved. When the head His opposite the end of the inclined portion lof the-'slot- 9, the part 12 will withdraw a little un'de'rthe action of the projection 10 andfwliilefltlije head 11 slides in that portion of 'the'slot which is parallel to the axis of the movement.

of the frame 7 (and when consequently the part 12 remains stationary), thehead 23 of the lever 22 is opposite the inclined portions of the groove 24:; On further turning the crank-disk 5, the lever 22 will be oscillated,

and its bifurcated end will move back the spindle 20, and with the latter the part 19, the crossbar 1S and the claws 17 which in that way are withdrawn in theinterior from the groove in which they travel, thus releasing the film.

Owing to the projection or boss 10 on the wall of the slot 9. and to the withdrawal of the part 12 resulting therefrom, when the claws 17 become withdrawn froni the ration of the film, they are not atthe endi of their stroke, the result of which is that all friction on the edges of the perforations: which is the chief cause of their wearing out;

is avoided. The further rotation of the 105 crank-disk 5 results in the moving of the frame 7 towardthe left and consequently in the raising of the part 12, the claws 17 held in the interior of the late being at the same -time raised owing to t e position of ahe lever 11 0 22. When the claws have reached the end of the return stroke, they are pushed forwa'rd perfoso as to project outside the plate, by means of the lever 22, the head 23 of'which' engages with another inclined portion of the groove 24. The claws 17 engage then with other perforations of the film and begin another driving motion. The movement of the point'ofthe claws 17 is shown for the sake of clearness, in dotted lines in Fig. 4. It descends from ato 1), moves back a littleto r, then rises to d and returns to a.

For-the purpose of doing away with the influence of play due to, the wearing of the parts, which would affect the, length of travel, there is arranged a' spring" controlled part .travel and consequently reduces the whole light, and thus to obtain clearer views. In v the construction shown. in the accompanying disk 5 makes a complete revolution,

stop 25 which pushes back the'tail 14 of the 12 as soon as it reaches the end of its play to one side. Such amechanism brings about a uniform driving of the film and. does away with any causes of injury toits perforations, for the, transmission of movement from the crank-disk?) to the frame 7 by means of' the connecting rod 6,.thespeed of travel of the'frame 7 as well as that of the part 12 and of the claws varies in accordance with a sinusoidal dia-" gram, so that the moment the claws have engaged with the perforations, they do not drive the film suddenly but first advance at a reduced speed" which gradually increases until it reaches the maximum atthe' center of the travel, after which it again decreases until it becomes zero at th end of the stroke.

The method of transmitting movement to the part-12 by'means of the slot 9 makes it possible to change, by changing the inclina-. tion of the slot, the time occupied by the travel of the claws relatively to the time .occupied by a complete movement, so that in an apparatus intended'for projecting photographs, it is possible, by reducing the inclination of the slot relatively to the vertical axis, to increase the duration of exposure to drawing, the descent-of the part12 takes'a quarter of the time during whichthe crankbut it will be understood that by reducing the inclination of the slot relatively to theaxis of the part 12, it is possible to make the travel of the part to last say only one-sixth,

one-seventh or one-eighth of thetime 'required by the disk 5 for making a complete revolution. In that case, itwill be naturally necessary .to modify the cam groove in the by the grooved rim of the crank-disk 5, sothat the claws should be brought into engagement with the perforations of the film, and withdrawn therefrom at the desired periods.

What I claim as my invention and desire to secure by Letters Patent is 1. An intermittent driving mechanism for a band or film, comprising a crank-disk and a transverse frame, a connecting'rod between the crank-disk and the frame, a plate intermittently. raised and lowered by the frame, claws carried by said plate for engaging the band and means for causing the" claws to periodically enga e with and move the band, and disengage t erefrom.

2. An intermittent driving mechanism for a band or film comprising a crank-disk, areciprocating frame having a central inclined slot therein, a connecting rod between the crank-disk and the frame, a plate'intermittently raised and lowered by the frame, and

claws carried by said plate for engaging theband.

.3. An intermittent driving mechanism for a band or film comprising a crank-disk and a transverse frame, a connecting rod between the cranledisk and the frame, aplatc intermittently raised and lowered by the frame, claws carried by said p gaging the claws to periodically engage with and move the band, and disengage therefrom, and a late for enspring-controlled stop, operating as described.

4. An intermittent driving mechanism for a band or filmcomprising a crank-disk having a cam groove therein, a rod connected to said crank-disk, a frame reciprocated by said rod and having a central inclined slottherein, a projection on that portion of the frame forming one wall of said slot and ad jacent one end of the latter, a head engaging said slot, a plate carrying said head and mounted to reciprocate in guides, claws mounted on the'plate, and'means controlled crank-disk for eii'ecting the band,means for causing the engagement and disengagement ofthe claws with and from the band periodically.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

, CARLO nossi.

' Witnesses: CARno ANTON IN G,

Lotus I\LBANI.

Images