Improvements in and relating to Apparatus for Synchronising Automatic Musical Instruments and Kinematographs.

摘要

7694. Janssens, L. April 1. Combined with kinematographs; tune-sheets. -Relates to a method of synchronizing an automatic musical instrument with a kinematograph. A performer may improvise music on a recording-piano while a film is projected on the screen. A device on the toothed wheel driving the film intermittently actuates mechanism for punching additional holes in the tune-sheet and also, in one modification, in the film. In reproducing the music thus recorded to accompany the projection of a film, the additional holes in the tune-sheet may control means for rotating a frame carrying resistances for the player-piano and kinematograph motors. The holes in the film, or a contact-device actuated by the toothed wheel driving the film, control means for rotating insulated contacts bearing on the resistances. If the tune-sheet and film do not run synchronously, the contacts move relatively to the resistances, so cutting resistance out of the circuit of one motor and putting resistance into the circuit of the other motor. Pneumatic or hydraulic motors may be used to drive the film and tune-sheet. Several automatic musical instruments may be synchronized with a kinematograph by somewhat similar means. In the form shown in Fig. 4, the cam Y on the toothed wheel driving the kinematograph film M1 actuates contacts Z to energize intermittently magnets P, P1, which operate punches Q, Q' to perforate the tune-sheet M produced by the recording-piano and the film M1. The holes thus produced in the tune-sheet control an electro-magnet which operates ratchet-mechanism for rotating a shaft h, Fig. 1, carrying two frames i for resistances j, k, in the circuits of the motors a, b, driving the player-piano and kinematograph respectively. The frames i are spaced apart on the shaft h and the resistances are stretched between them. The perferations in the film, or the contact Z, Fig. 4, control an electro-magnet which operates ratchet-mechanism for rotating a shaft c carrying insulated arms d, c, which bear against the resistances j, k, and are connected to the motors a, b, respectively. If the tune-sheet and film do not run synchronously, the shafts c, h rotate at different speeds, causing the arms d, c to vary the resistances in the circuits of the motors a, b. Pointers q, r on the shafts c, h show when the tune-sheet and film are in synchronism. In synchronizing a kinematograph with several automatic musical instruments, such as a piano, organ, and harmonium, a rotary contact and resistance of the kind shown in Fig. 1 may be provided for each musical instrument, and the speed of the kinematograph may be kept constant by hand - regulation. Specification 27,911/11 is referred to.