US1800049A - Printing machine adapted for use with unimpressed films requiring a very long exposure - Google Patents

Description

A1111] 7, 1931. M. G. M. G. BIZOT 1,800,049 PRINTING MACHINE ADAPTED FOR USE WITH UNIMPRESSED FILMS REQUIRINGQA VERY LONG EXPOSURE Filed April 29, 1929 711.6. W2. 6. ggat Patented Apr. 7, 1931 umreo STATES PATENT OFFICE Mancini EORGES MARIE GASTON BIZOT, or CHAMPIGNY-SUR-MARNE, FRANCE PRINTING MACHINE ADAITED 10R USE WITH UNIMPRESSED FILMS REQUIRING A VERY LONG Application filed April 39, 1929, Serial No.

I have described in my co ending U. S. application No. 322,836, filed ovember 30, 1928, entitled Cinematographic film chiefly adapted for reproduction and apparatus for using same a film for printing which requires a very long exposure, say ten or twenty minutes or even more.

My presentinvention has for its object a printing machine adapted for use with unimpressed films of this or any other type requiring a very long exposure. It comprises a large glass drum round which are spirally wound one over the other first the negative and then the film to be impressed. This negative and the said'film are pressed down and shielded from light by a suitable dark band.

A light source disposed along the axis of the drum projects its light normally on to the negative and positive films.

The film to be impressed is not perforated before printing because due to the usual irregular distances between the perforations it would be absolutely impossible to make all the perforations in the two films coincide throughout their length as certain pictures printed on the positive film would in such a case be shifted with reference to their perforations. When the unimpressed non-perforated film has been impressed and the picture fixed, the pictures of the perforations in the negative appear. For a correct marking of these perforations, they should be provided at these pictures. The film is therefore passed through a perforating machine and thepitch of the machine is adjusted continuously so as to cause the perforations tobe constantly provided in the pictures of the negative in spite of the irregular intervals between the latter.

The printing lamp which is to illuminate, in a uniform manner and exclusively through beams perpendicular to the films, the whole length of the film wound over the glass drum, is preferably constituted by a tubular mercury vapor. lamp disposed along the axis of the glass drum. A large number of parallel screens are arranged very near one another round the lamp which screens consist in discs normal to the drum axis throughout the length thereof. These screens serve to cut up the beams of light into beams containing only EXPOSURE 859,142, and in France October 11, 1928.

rays perpendicular to the film. The discs are connected through bars so as to form a unit hanging from its upper end. In order that the illumination should be identical in all points of the film, the unit is rotated cont-inuousl whereby the detrimental effect of the sha ows of the connecting bars is avoided; a longitudinally reciprocating movement of small amplitude is also given to the unit so as to avoid the effect of the shadows of the discs themselves.

I use for winding and unwinding the negative film preferably with its celluloid face, turned inwards, the film to be printed also preferably with it celluloid face turned inwards and the outer band, a cage rotating round the glass drum and provided with a carriage bearing the feed and take-up reels and inclined by an angle corresponding to the .pitch of the films as wound on the glass drum. The carriage is borne by two nuts screwed over threaded rods parallel to the axis of the glass drum which .rods rotate round their axis whilst the cage rotates round the drum.

, I have described hereinbelow by way of example and shown on accompanying drawings a form of execution of my invention.

Fig. 1 is a side view of the glass drum with its, lamp and screens.

Figs. 2 and 3 are a side andva plan view of the outer cage with its film-winding carriage,

Referring to Fig. 1 the frame 1 carries the vertical glass drum 2, along the axis of which is disposed the tubular mercury vapor lamp 3. Bound this lamp are disposed a large number ofdiscs 4 very near to each other and connected by means of bars 5 secured at their upper end to a toothed wheel 6.

This wheel 6 rests through rollers 7 on a c lindrical cam 8; an electric motor '9 drives t rough a suitable gearwork 1O.1 1-12 the wheel 6 which rotates; thus slowly and constantly a complementary reciprocating vertical movement is given to the wheel 6, due to the presence of the cam 8,

Round the glass drum 2 may rotate a cage secured to the lower worm wheel 13 (Fig. 2). This wheel is controlled by a. worm 14 and carrie wo verti l h d r .5 a 1 mounted the corresponding nuts 17, 18 carrying the carriage 19." This carriage comprises two cheeks inclined to correspond with the V pitch of the filmswound over the glass drum and carries on its upper surface three reels 20, 21,22 feeding respectively to the glass drum the negative film, the unimpressed film and the outer protecting band. These three rewinding reels act as free wheels when the carriage moves downwards and allow the three strips to wind off them onto the drum wall with a slight braking action. When the carriage moves upwards'again, a clutch device dis posed in each reel causes them to rotate for the strips from the drum wall on to the reels.

Three other reels 23, 24, 25 disposed underneath the first reels and acting in a similar but reverse manner allow the machine to be used-in a continuous manner. Whilst the first three reels 20, 21, 22 are winding up their strips, the reels 23, 24 and 25 unwind the strips carried by them. The reels are controlled by a shaft 26 also carried by the outer cage formed by the wheel 13-and its rods 15 and 16. The shaft 26 ends with pinions 26, 26'. meshing with the stationary toothed Wheels 1, 1'. The shaft 26 passes through the carriage 19 and controls through a spher ical joint the pinion 27 which drives the sevlar mercury vapor lamp disposed inside and along the axis of the drum, a series of discshaped screens perpendicular to the said axis, disposed 'very near each other, bars for connecting the screens together, a toothed wheel secured to the said bars, means for rotating said wheel continuously, a stationary rollers interposed between the cam-shaped path and the toothed wheel.

In testimony whereof I have affixed my signature.

MARCEL csoscrs'mmr cAsrou VBIZOT.

The outer cage 131516 is closed by a protecting plate 28 (Fig. 3).

at I claim is:

1. A machine for printing. unimpressed 40 filmsrequiring a very long exposure from a negative comprising a large transparent drum for receiving the superposed negative, unimpressedfilm and protecting material, a printing lamp disposed inside and along the axis ofthe drum,and a series of screens perpendicular to said axis and disposed very near each other for allowing only normal rays' to fall on the drumvwall from the lamp.

2(A machine for printing unimpressed films requiring a very long exposure from'a negative comprising a large glass drum for receiving the superposed negative, unimpressed film and protecting material, a tubular mercury vapor lamp disposed inside and along the axis of the drum, a series-of discshaped screens perpendicular to the said axis disposed very near each other, bars for co11 V V necting 'thescreens together and means for givlng the screens and bars acontinuous ro-' t'ary motion round the axis and a small reclprocating motion along said axis. it

3. A machine for printing unimpressed films requiring a very long exposure from a negat ve comprising a large glass drum for recelvlng the superposed negative, unimpressed film and protecting material, a tubu-

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