US 2305011 A
Description (OCR text may contain errors)
Patented Dec. 15, 1942 UNITED STATES PATENT CINEMATOGRAPHIC APPARATUS John F. Kienninger, Los Angeles, Calif., assigner to Technicolor Motion Picture Corporation, Los Angeles, Calif., a corporation of Maine Claims.
In subjecting cinematographic film to liquid treatments there is a tendency for liquid pelllcles to bridge the sprocket holes, thereby giving rise to subsequent dliliculties. For example, ii the pellicles break while the film is drying they tend to spatter the picture areas of the film, and in any event they tend to clog the sprocket wheels over which the film is subsequently run. These tendencies are particularly pronounced in forming relief pictures by etching oft part of the gelatine, including all the gelatine from the edges of the lm to the central row ci' picture areas, because the pellicles often comprise relatively thick patches of gelatine which float oilr the film during the etching process. While most of the patches may be rinsed oil after etching and before drying, some cling in the sprocket holes in the form of pellicles partly or completely bridging the holes.
Objects of the present invention are to avoid the aforesaid diiiiculties by removing the pellicles in such a way that they do not damage the picture areas.
For the purpose of illustration a typical embodiment of the invention is shown in the accompanying drawing in which:
Fig. 1 is a diagrammatic view of the apparatus, including means for etching the film; and
Fig. 2 is a section on line 2-2 oi Fig. 1.
The particular embodiment of the invention chosen for the purpose of illustration comprises etching means indicated generally by E and scrubbing means indicated generally by S. The etching means comprises a tank l having series of rollers 2 at the top and bottom for guiding the nlm F through the tank along a zigzag .path in the direction indicated by the arrows, together with nozzles at the top of the tank for ilowing warm water downwardly along the vertical stretches of film in the tank. 'Ihe particular nozzle arrangement shown in Fig. 1 comprises a manifold 2' to which Water is supplied through the pipe 3 and a series of nozzles l depending from the manifold 2 in alignment with the vertical stretches of the nlm F, each of the nozzles 4 being provided with an opening in its lower end to permit the water to flow by gravity to the film. In addition to the aforesaid nozzles other nozzles 5 are located between the rollers of each adjacent pair of rollers in the tank I, the nozzles i being provided with outlets 6 directed laterally and downwardly against the nlm on the rollers 2.
After the nlm leaves the etching means E it passes upwardly to the scrubbing means S which comprises a guide roller l, two scrubbing rollers 8 opposed to a nlm guide in the form of a backing roller 9, another guide roller i9, a rinsing tank il and another guide roller i2, a nozzle il being located immediately above the space between the rollers 8 and 9 to direct a stream of rinse water downwardly along the nim as the margins of the illm are scrubbed by the rollers il. The backing roller 9 is preferably formed of Bakelite or other molded material mounted on bali bearings lil which are adjustably mounted on the frame ifi through the medium of the eccentric i5. The rollers 8, which are preferably mounted on the same shaft IB, comprise two discs il integraily connected by a cylindrical portion it, each ci the discs Il being recessed at its outer periphery to receive a sponge-rubber ring i9 which serves brush. The sponge-rubber rings are held in their recesses by clamping rings 20 held in place by screws 2|. y
As shown in Fig. 2 the xponge-rubber ringe i9 are spaced apart a distance substantially equal to the distance between the two rows of sprocket holes in the film F and the rubber rings are Wide enough to extend to the outer edge of the film.. The shaft IG is driven by suitable means, not shown, to rotate the rollers t in a counterclock wise direction as indicated by the arrow in Fig. i, the frictional engagement of the film with the backing roller 9 also rotating this roller in a counterclockwise direction. Best results have been secured by advancing the nlm at the rate of approximately 36 feet per minute and rotating the rollers 8 with a peripheral linear velocity of approximately 1275 l'eet per minute. The scrubbing action oi' the sponge-rubber rings I9 loosens and removes the gelatin from the margins and sprocket holes of the lm and the rinsing jet it carries the loosened gelatin away.
It is to be understood that the present disclosure is for the purpose of illustration only and that this invention includes all modiiications and equivalents which fall within the scope of the appended claims.
i. In apparatus tor making motion pictures by etching oil a part of the gelatin with etching liquid to leave images in relief, involving a tend ency for gelatinom peilicles .to bridge the sprocket holes, the combination ci cleaning means for breaking said gelatincus pellicles out of the sprocket holes, said means acting upon the sprocket-hole zone of the film Without corre spending action on the picture zone, and means for rinsing away the gelatinous material cleaned out of the sprocket holes.
2. In apparatus for making motion pictures by a part of the gelatin with etching We images in relief, involving a tendlatinous pellicles to bridge the sprocke combination of means for scrubbing t-lnoles zone of the iilm without scrubture zone and means for rinsing .tinous material scrubbed out of the .v ...i sw.
nparatus for making motion pictures by c, part oi the gelatin with etching a images in relief, involving a tendlnous pellicles to bridge the sprockcombination of means for scrubbing elect-holes zone oi the film without scrub- -ieture zone and means for rinsing sway ons material scrubbed out of the 5 haies, said scrubbing means comprising ma scrubber rotating about an axis W 'angevin of the nlm and engaging only n the 111m.
part of the gelatin with etching o leave images in relief, involving a tendtinous pellicles to bridge the sprockcembination oi means for scrubbing bing the picture zone and means for rinsing away the gelatinous material scrubbed out of the sprocket holes, said scrubbing means comprising a narrow rotary scrubber rotating about an axis extending edgewise o! the iilm and engaging only the margin o! the nim, and a roller on the side of the nlm opposite the scrubber for holding the nlm against the scrubber.
5. In apparatus for making motion picture nlm by etching oi! a part oi the gelatin with etching liquid to leave images in relief, involving a tend-- ency for etched-oi! gelatinous peliicles to bridge the nlm perfor-ations, the combination or means for transporting the film, a scrubber mounted for rotary movement with its eiective surface engaging, and extending substantiallv only over the marginal zone including said periorations and adapted to loosen and remove the gelatin from the periorations o! the i'ilm as positioned in said transport means, means for rotating saidscrubber to provide relative scrubbing movement between said film engaging surface and the iiim moving in said transport means, and means for directing a rinsing jet towards said periorations for carrying away the loosened gelatin.
JOHN F, KIENNINGER,