Speed-Regulating Means. Page: 3 of 6
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UNITED STATES PATENT OFFICE
THEODORE FLETCHER, OF. SAN ANTONIO, TEXAS.,
SPEED-REGULATING MEANS.Specification of Letters Patent.
Patented July 9, 1918.
Application filed May 16, 1917. Serial No. 165,972.
To all whoat it may concern:
Be it known that I, TIIEoDORE FLETCHER,
a British subject, and a resident of San
Antonio, in the county of Bexar and State
5 of Texas, have invented an Improvement in
Speed-Regulating Means, of which the fol-
lowing is i specification.
In sound recording and reproducing ma-
chines utilizing disks for the records such
10 disks-so far as informed-are revolved at
a uniform ..speed; consequently no more
sound is recorded on the outside spiral than
on the innermost one, although the length
is much greater.
15. As a result of this practice, it is not possi-
ble to-record the whole of the surface of a
large disk, because of the difference in the
speed of the travel of. the disk under the
stylus or needle. If the speed were correct
20 for the outside spirals of the disk, then it'
would be too slow for the inside ones, and if
fast enough for the inner ones then it would
be too fast.-for the outside spirals; conse-
quently the present practice is to record. only
25 a comparatively small area of a disk, so that
the relative speed of travel between the out-
side and the inside spirals shall be within
certain bounds so that both can be played.
In the ideal instrument, the speed of
30 travel of the disk should be the same
throughout., that is the speed of that portion
of the disk traveling under the stylus should
be the same no niatter at what part of the
disk thO stylus is located, and that speed)
35 should be the speed at which the best re-
sults can be obtained. If the speed- is too
fast, there is unnecessary friction between
the stylus and disk, and as a result loud
scratching sounds are produced. If the
40 speed is too slow volume of sound is sacri-
ficed and the results are otherwise unsatis-
factory.
The present invention aims to overcome
these objectionable features by providing a
45 means for gradually increasing the speed of
the disk as the center is approached or re-
tarding the speed if the record is made from
- the center outward. In consequence of .this
method there' need be no reasonable limit.to
50 the size of the disk and practically the en-
tire surface may be utilized for receiving. a
record, with the exception of a small cen-
tral area.The -drawings illustrate an embodiment of
the invention, and- 55
Figure 1. is a top plan view of a sound
recording and reproducing machine ilhis-
trating the application of the invention,'the
cover of the 'case being thrown open.
Fig. 2 is-a sectional detail on the line 2-2 60
of Fig. 1, looking in the direction of the
arrows.
Fig. 3 is an elevation showing more
clearly the speed regulating means, the up-
per portion of the case being in section. 65
Fig. 4 is a top plan view of the friction
wheel which is in contact with the rotary
table showing the parts associated there-
with, the friction wheel and its supporting
shaft being in section. 70
Fig. 5 is a side view 'of the friction wheel,
with its supporting shaft, the latter being
* in section.
Corresponding and like parts are referred
to in the following description and indi- 75
coated in all the views of the drawings by
the same, reference characters.
The numeral 1 designates the rotary table
generally employed in sound recording and
reproducing machines for receiving the 80
disks containing the record. This table is
carried by the usual shaft or spindle 2,
which is driven from a suitable source of
power inclosed in the casing of the machine.
The disk 3 is. of ordinary foim generally 85
employed for receiving-the record, such disk
being supported uipon the table 1 and caused.
to rotate therewith by frictional contact in
the manner well understood. In the present
instance, the shaft 2 is provided with a gear 90
wheel 4 which is in mesh with a pinion 5
secured to a shaft 6, the latter receiving
'power from the' motor, not shown, in a
manner well understood.
A shaft 7 disposed parallel with the disk 95
carrying shaft 2 is provided with bevel gear
wheels 8 and 9. A longitudinal shaft 10
mounted in a bearing 11 is- provided at op-
posite ends with bevel gear wheels 12 and 13.
The bevel gear wheel 12 is in mesh with a 100
bevel gear wheel 14 secured to the shaft 2,
and the bevel gear wheel 13 is in mesh with
the bevel gear wheel 9.' As. a result of 'this
arrangement the shaft 7 is positively driven
from the shaft 2. A screw shaft 15 is ar- 105
ranged horizontally at- a point below the1,271,881.
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Reference the current page of this Patent.
Fletcher, Theodore. Speed-Regulating Means., patent, July 9, 1918; Washington D.C.. (https://texashistory.unt.edu/ark:/67531/metapth1257231/m1/3/?q=%22%22~1: accessed July 4, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.