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1. GB232064 - Improvements in or relating to recording apparatus for producing music records for use in player pianos

Office
United Kingdom
Application Number 1293024
Application Date 26.05.1924
Publication Number 232064
Publication Date 16.04.1925
Publication Kind A
IPC
G10G 3/04
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
GAIDS FOR MUSIC; SUPPORTS FOR MUSICAL INSTRUMENTS; OTHER AUXILIARY DEVICES OR ACCESSORIES FOR MUSIC OR MUSICAL INSTRUMENTS
3Recording music in notation form, e.g. recording the mechanical operation of a musical instrument
04using electrical means
CPC
G10G 3/04
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
GREPRESENTATION OF MUSIC; RECORDING MUSIC IN NOTATION FORM; ACCESSORIES FOR MUSIC OR MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR, e.g. SUPPORTS
3Recording music in notation form, e.g. recording the mechanical operation of a musical instrument
04using electrical means
Applicants JOSEF HOFMANN
Priority Data 1293024 26.05.1924 GB
Title
(EN) Improvements in or relating to recording apparatus for producing music records for use in player pianos
Abstract
(EN) 232,064. Hofmann, J. May 26, 1924. Recording m u s i c .- In electrical apparatus for recording the touch employed in playing the pianoforte, a rocking frame extends under some or all of the keys and rotates to various extents a contact drum which meets a gradually increasing spring resistance and is eventually stopped and returned thereby. Preferably one frame 4 extends under the treble, and another under the bass, key 5, the frames being pivoted as at 2 and each carrying an arm 6 which by a band 7 or toothed segment rotates a pulley 8 and the contact drum 12. In the path of a pin 14 on the drum are a number of spring-controlled arms a<1> - -- a<11>, which as thev successively come into action cause a gradually increasing resistance to the movement of the drum. In order to prevent, after a heavy blow, too rapid return of the drum under the spring action, the pin 14 is connected to the piston of a dash-pot 16, which has a tapered slot in its cylinder so that its effective braking-action is greater the greater the pistonstroke, thus ensuring closure of the electric contacts for a sufficient length of time to enable the recording elements to function. Each frame operates four recording devices, the contacts on the drum being arranged in various combinations.