Patent GB-343363-A (GB)
Title: Braking arrangement for cinematographic reels
IPC: G03B21/43
Filed: 1930-03-27
Abstract: 343,363. Kinematograph apparatus. SOC. DES ETABLISSEMENTS GAUMONT, 57, Rue St.-Roch, Paris. March 27, 1930, No. 9816. Convention date, March 30, 1929. Addition to 311,411, [Class 97 (i), Optical systems &c.]. [Class 97 (i).] In apparatus according to the parent Specification, in which a clip engages a spiral slot in a disc driven with the take-up or pay-out spool to equalize the tension of the film, means is provided whereby a spring is compressed automatically with the shutting of the door of the spool box, and is freed, when the spool is removed from its spindle after the film run, to return the clip lever to its starting position so that it is again ready for use ; the means is such that the spring does not produce any action on the lever during the film run, and the starting position of the lever is determined by an adjustable stop. As shown, the lever 6, pivoted at 7, is connected by a rod 13 to a piston 12 within a cylinder 10 secured to the spool box, the piston being surrounded by a compression spring 17 extending between a flange at the end of the piston and a stop 18 slidable thereon. The spool 35, when placed in position on its spindle 24 and secured by turning the hinged end 36, presses on a sleeve 23 to turn a lever 19 about its pivot 20 against the action of a spring 21. The movement of the lever 19 permits, through a pin 34 and pivoted vane 30 pressed by a spring 32, a pin 8 on a spring strip 8a carried by the lever 6 to come into position to engage the groove in the disc 15, and also turns a pivoted arm 26. The arm 26 is provided with a slide, movable parallel to the axis of the cylinder, and carrying a pin 29 passing through the stop 18; the cylinder is provided with a slot parallel to the slide through which the pin projects. The stop 18 is connected by rods 48 to a slide 47, Fig. 3, carrying a spring- pressed lever 43 which may engage a slide 42 connected by a rod 41 to a lever 37 so that both slides move together to the right when an arm 55 on the door 53 of the spool box moves the lever 37 against the action of a spring 39 as the door is closed. During this movement the lever 6 comes into engagement with an adjustable stop 16 and the spring 17 is thereafter compressed until the pin 29 comes into register with a notch in the piston 12. The pin then enters the notch under the action of a spring 27 and locks together the piston, stop 18, and lever 6 so that they all subsequently move together as film-winding proceeds, the spring being in compression but inoperative. At the same time as the pin 29 enters the notch, the end 50 of the lever 43 rides up a slope 51 on the lever 6 to free the lever from the slide 42 so that the closing of the door 53 may be completed without further action on the slide 47. When, at the end of the film run, the spool 35 is removed from its spindle, the spring 21 operates to cause the removal of the pin 8 from the slot in the disc, and to withdraw the pin 29 from engagement with the notch in the piston, thereby.releasing the spring 17 so that it pushes the lever 6 into the starting position in engagement with the stop 16.