Several machine screws 37 extend through holes in side 2 to mount lower section 33 to it. The worm assembly 25 rides in a cylindrical grooved guide way 31 formed in the lower housing section 33 which section receives the actuator link 27 in a right angled housing cutout 35. Beside the worm gear assembly an actuator link slide 27 is used to transmit linear motion from the push/pull solenoid 29 to the drive shaft to move the drive shaft left, right or center. Mounted on the drive shaft is a worm gear assembly 25.
The lower driven timing pulley 7 has a center hub which is set screwed to an hexagonal spline shaft 21 which engages with and extends to the end of rotatable drive shaft 23. Motor mounted bolt ends 17 extend through recessed holes in housing side 2 where nut and washers 19 fix them and their motor to the housing. An electrically operated gear motor 11 is connected by its engaging shaft 13 to the center hole 15 in upper timing pulley 5. 2 is a perspective exploded view showing the mentioned components and the internal components used in FIG. As the engaged piano tuning pins get closer together for a given note, the wrenches may be adjusted via a thumb wheel to spread or squeeze the worm gear bearing blocks. In this way each note in a piano has three strings tuned in unison simultaneously by the worm segments. Each segment of the worm can be driven separately and each is connected to tuning wrench heads. The drive unit has a motor driven timing belt used to control a 3-piece worm. The current piano tuning invention utilizes an electronic control unit having a condenser microphone, digital LED readout and buttons leading to a drive unit. With the advance of audio electronics tuning methods became more sophisticated resulting in a greater interplay between the tuner and the electronic and other instruments employed in the process. Initially, it depended almost entirely on the trained ear of the tuner using a tuning fork and perhaps a few adjustment tools. The tuning of pianos has been accomplished many ways over the years. G10C3/10- Tuning pins Tensioning devices.G10C- PIANOS, HARPSICHORDS, SPINETS OR SIMILAR STRINGED MUSICAL INSTRUMENTS WITH ONE OR MORE KEYBOARDS.conductors' batons or separate holders for resin or strings G10G7/00- Other auxiliary devices or accessories, e.g.G10G- REPRESENTATION OF MUSIC RECORDING MUSIC IN NOTATION FORM ACCESSORIES FOR MUSIC OR MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR, e.g.238000006011 modification reaction Methods 0.000 description 1.229910001369 Brass Inorganic materials 0.000 description 1.230000000875 corresponding Effects 0.000 claims description 4.Priority to US08/722,999 priority Critical patent/US5756913A/en Application granted granted Critical Publication of US5756913A publication Critical patent/US5756913A/en Anticipated expiration legal-status Critical Status Expired - Fee Related legal-status Critical Current Links Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Gilmore Don A. Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related Application number US08/722,999 Inventor Don A.
#ELECTRONIC PIANO TUNER PDF#
Google Patents US5756913A - Automatic piano tunerĭownload PDF Info Publication number US5756913A US5756913A US08/722,999 US72299996A US5756913A US 5756913 A US5756913 A US 5756913A US 72299996 A US72299996 A US 72299996A US 5756913 A US5756913 A US 5756913A Authority US United States Prior art keywords tuning piano worm drive shaft note Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
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