Patent GB-1265180-A (GB)
IPC: G03B21/00
Filed: 1969-12-04
Abstract: 1,265,180. Film editing tables. L. VAGHI. Dec. 4, 1969 [Dec. 5, 1968], No. 59156/69. Headings G2C and G2E. An editing table has means for feeding films having either of two alternative gauges, each at a different speed, and each having its lower edge spaced at the same constant distance from the table surface. As shown, the feed device comprises a hollow body member 3 mounted within another hollow body member 1 which is secured to the table 2, the device extending through an opening in the table. Two spokes 4 extend from member 3 through vertical slots 5 in member 1. Two similar spokes 9 extend from member 1, and the ends of the spokes are linked by pre-loaded C- springs 10. Member 3 can move vertically within member 1 between extreme upper and lower positions, limited by the movement of spokes 4 in slots 5, and the C-springs 10 urge member 3 into one or the other position as soon as spokes 4 pass the centre point of the slots, see Figs. 3 and 4 (not shown). A hollow shaft 11 is mounted within member 3, and supported therein by rotary bearings 12, 13. The upper part of the shaft 11 extends above member 3, and on this part is rotatably mounted, by means of bearings 14, 15, a sprocket 16. Sprocket 16 has outer sets of teeth 17, 18 for engaging in the perforations of 35 mm film (as seen in Fig. 1), and inner sets of teeth 20, 21 for engaging in the perforations of 16 mm film, as in Fig. (not shown). Above sprocket 16 is a ring 23 keyed to shaft 11, and above the ring a knob 26 threaded on to the end of shaft 11. When knob 26 is screwed downwards, ring 23 is pushed down, against a spring 24 resting on another ring 25 fixed to shaft 11, until the ring 23 locks frictionally with sprocket 16. This makes sprocket 16 fast with shaft 11, so that it rotates therewith (Fig. 1 position). When knob 26 is unscrewed, ring 23 is released to move upwards under the action of spring 24. This it no longer locks with sprocket 16, which in turn is therefore no longer fast with shaft 11. A rod 34 extends axially within shaft 11, and when knob 26 is screwed down, rod 34 is forced downwards against a spring-loaded piston pin 30. When the pressure is released by unscrewing knob 26, piston pin 30 is urged upwards by the spring 28, carrying with it a bearing 31 and a plate 32. As plate 32 moves upwards, it engages underneath a number of cylinders 33 seated in body member 3. (Only one cylinder 33 is seen in Fig. 1). As these cylinders are lifted, they engage against the under surface of sprocket 16, so locking it against movement, so that shaft 11 can now rotate independently of sprocket 16. The drive is transmitted to the device from an electric motor, connected by belts to pulleys 41 and 46. Pulley 41 is fast with a shaft 40 rotatably mounted within body member 1 by bearings 38, 39. When member 3 is in the raised position with respect to member 1, Fig. 1 position, teeth 42 on shaft 40 engage teeth 37 on a bushing 35 fast with shaft 11. The drive is thus transmitted to shaft 11 and hence sprocket 16, which drive the film strip 19 accordingly. The other pulley 46 is fast with a shaft 45 rotatably mounted within shaft 40, and having at its upper end a shaped head element 47. When member 3 is in the lowered position with respect to member 1, teeth 37 move downwards and hence are disengaged from teeth 42, and a seating 36 in bushing 35 fits over the head element 47. Thus the drive from pulley 46 is now transmitted to shaft 11 and hence sprocket 16. This time the inner sprocket teeth 20, 21 are used to transport a narrower gauge film strip (22), Fig. 2 (not shown), and the speed is different since pulleys 41, 46 are of different diameter, thus enabling either film strip to be transported at the same number of frames per second. Since in the second position sprocket 16 is lower than in the first position, it is arranged that the lower edge of the narrower gauge film (22) is at the same fixed distance from the top of table 2 as the lower edge of film 19 in the first position.