AUTOMATIC CHECK FOR MUSIC BOXES
Year: 1886

page_text: I ARTHUR PAILLARD of N° 62 Holborn Viaduct in the City of London Musical
Box Manufacturer trading as A. Paillard & Co do hereby declare the nature of my
invention for AUTOMATIC CHECK FOR MUSIC BOXES and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement:-
.
The object of my invention is to provide a new and improved check for auto-
matically locking the driving mechanism or the pin-cylinder of a music box in case
the flier mechanism is disconnected or the cylinder bearing loosened or the power
controlling mechanism is in any way disconnected from the spring, which check
prevents, a too rapid revolution of the pin-cylinder and thus prevents the con-
sequent breaking of the pins and the teeth of the comb.
The invention consists in the construction and combination of parts and details,
as will be fully described and set forth hereinafter and then pointed out in the
claims.
Reference is to be had to the accompanying drawings forming part of this
Specification in which similar letters of reference indicate corresponding parts in
all the figures.
Figure 1 is a plan view of the mechanism of a music box provided with my
improved automatic check.
Figures 2 and 3 are end views of the same, parts being broken out and the
locking dog being shown in different positions.
Figure 4 is an end view of the mechanism the check being arranged to lock the
cylinder at the end at which the wheel for driving the flier is located.
The cog wheel A, driven by a spring in the usual manner, engages with the
pinion B on the shaft C mounted to turn in the standard D on the base plate E, of
the music box mechanism.
In one side of the standard D the recess G is formed and in the same the ratchet
wheel H is mounted on the shaft C.
The pawl or dog J is pivoted on one side of the standard D in such a manner
that it can engage with the teeth of the ratchet wheel H, the end of said dog being
Doins G71

page_text: rounded slightly to form a cam edge K, the points of the teeth of the ratchet
wheel H acting on the cam edge K of the dog J.
The spring L is connected with one end of the dog and holds the other end in
such a position that the ends of the teeth of the ratchet wheel can act on it.
As shown in figure 4 the pinion B engages with the cog wheel M which operates
the flier mechanism.
The pin-cylinder N, the comb P, the flier S, and the driving gear are all of the
usual construction.
If desired the ratchet-wheel may be formed on the end of the pin-cylinder.
The operation is as follows:-
The ratchet wheel H is revolved in the direction of the arrow a¹ Figure 2, and
as each tooth of the said ratchet wheel strikes the cam edge K of the dog J and
presses the end of the cam in the direction from the edge of the wheel, then the
said tooth slides under the cam end of the dog, and the spring L swings the dog
towards the rim of the ratchet-wheel so far that the next tooth of the ratchet
wheel can act on it, and so on, the dog being swung outward by each tooth of the
wheel H.
In case the driving mechanism is in any manner disconnected from the flier or
the cylinder bearing is loosened, the cylinder is revolved very rapidly and the first
tooth of the ratchet wheel H that strikes the dog J, forces the dog down into the
recess between two teeth as shown in Figure 3, and thus locks the cylinder in
place and prevents the breaking of the cylinder pins or the teeth of the comb.
The teeth of the ratchet wheel can only raise the dog J, when the said wheel H
and the cylinder revolve slowly.
I am aware that it is not new in music boxes to provide a ratchet and pawl
check to automatically act to lock the device when the cylinder and gearing.
revolve too fast and I do not claim such broadly as of my invention.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
1. The combination with a music box mechanism, of a ratchet wheel connected
therewith and revolved thereby, a pawl adjacent to the ratchet wheel and having
a pawl end, and a spring acting on the pawl and holding its free end in the path
of the ends of the ratchet teeth to be raised slightly by said teeth; whereby when
the music box operating mechanism is rotated too fast the ratchet wheel will
revolve rapidly and force the pawl into locking engagement with a tooth thereof
and stop the said mechanism, substantially as set forth.
2. The combination with a music box mechanism of a ratchet wheel revolved
from the cylinder or the main driving wheel of the dog J having the cam edge K
on one end, substantially as herein shown and described.
Dated this.15th day of June 1886. ·