TECHNICAL SECTION
MAIN GENERATOR - GENERAL DESCRIPTION
Each Hammond Organ console has a main generator within it, and in
some cases, depending on the model, a chorus generator. This section
describes a main generator, illustrated (generically) below.
The main generator assembly consists of the generator proper, a shaded
pole induction motor for starting, a non self-starting synchronous motor
for driving the unit after it is started, and either a tremulant switch
mechanism or a Vibrato Scanner mounted on the synchronous motor. The
entire assembly is mounted on two long steel angles which also provide
the means of mounting the tone generator in the console. The method of
mounting is such as to minimize the transmission of vibration from the
tone generator to the console.
A drive shaft, resiliently coupled to the synchronous running motor, extends
the entire length of the generator. Twenty-four driving gears, two each of
twelve sizes, are mounted on this shaft, and the drive shaft itself is divided
into several sections connected by flexible couplings. The starting motor
is mounted at the end of this drive shaft, opposite the synchronous motor.
Section 7 (Console Power Wiring) describes the starting procedure.
The main generator proper is a long structure in which are mounted 48
rotating assemblies, each consisting of a shaft and two discs known as
tone or phonic wheels. These assemblies are coupled resiliently to the
drive shaft. Each of the driving gears engages two bakelite gears
associated with opposite rotating assemblies (See Figure 2). These
bakelite gears rotate freely on the shafts with the tone wheels, and are
coupled to their respective assemblies by a pair of coil springs. There
are 12 sizes of bakelite gears, corresponding to the 12 sizes of driving
gears. Thus 4 of the tone wheel assemblies, each with 2 tone wheels, run
at each of 12 speeds.
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