Improvements in Mechanism for Imparting Intermittent Motion to Machinery.
Year: 1892

page_text: Date of Application, 2nd Nov., 1892
Complete Specification Left, 2nd Aug., 1893-Accepted, 2nd Sept., 1893
PROVISIONAL SPECIFICATION.
Improvements in Mechanism for Imparting Intermittent Motion to
Machinery.
I, ALFRED PARTRIDGE of 5 Cannon Street, Manchester, in the County of
Lancaster Engineer do hereby declare the nature of this invention to be as
follows:-
This invention relates to a means of applying intermittently at such portions of
the work as may be required, and at the will of the operator, the power employed
for propelling machinery.
I attain this object by the means hereinafter described and as illustrated in the
accompanying sheet of drawings in which Fig. 1, is front view and Fig. 2 is side
view representing my invention.
In these views similar letters refer to similar parts.
In this invention I attach to any portion of a machine, of. which a may be part
of the side frame, a pulley b which I mount on one end of a shaft c, said shaft being
placed across and transmitting motion to the machine by means of cranks or by
eccentrics or the like. The power is communicated from the driving shaft to
aforesaid pulley preferably by a belt or strap d.
In order to apply the power at such times only as may be required, I form a
semicircular keyway e in the end of aforesaid shaft c, and in this keyway I insert
the keyf which is formed in the manner shown partly in section in Fig. 3, the part
of said key that is intended to be within the boss 6 of the pulley 6 having a part
thereof cut away so as to leave an edge fat each side of the cut portion of
the key, said cut portion being of the same radius as the circumference of the
shaft c.
I fit securely on the shaft c a disc wheel g, said disc wheel being formed on the
face thereof with a fixed stop 9', and an adjustable stop g. The herein before
described key is then slipped into the keyway e with the tail piece that is
attached to the key f resting in the recessed portion of the disc wheel g and
between the stops gl and g³.
I place the pulley 6 on the shaft c and secure said pulley in position on the shaft
by means of the collar h.
I attach a spindle ; to the frame a of the machine, and place thereon a bell
crank k; I also place a treadle at the opposite end of said spindle.
By these means when power is transmitted to the pulley from the driving shaft
by the belt or strap d, said pulley is caused to revolve and during the time the
keyfis in the position represented in Fig. 1 with the cut portion in a line with
the circumference of the shaft c said pulley will revolve without transmitting
motion to the machine.
When the power is required to be transmitted, the treadle I is pressed down ;
the tail piece attached to the key will then be caused to fall down on to the
stop by the spring f, and the edges will engage with the internal portions of
keyway both in the boss of the pulley b, and the shaft c thereby causing said shaft
to revolve until the treadle is released, when by the action of a spring such as m
on the spindle j the end of the bell crank k is returned to a vertical position as
shown in Fig. 1, and the tail piece f³ is arrested in its circular progress, thereby
freeing the aforesaid pulley b which will then continue to run as a loose pulley.
Dated this 1st day of November 1892.
THOMAS
PRESCOTT,
53, Arcade Chambers, St. Mary's Gate, Manchester,
Agent for Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Mechanism for Imparting Intermittent Motion to
Machinery.
C I; ALFRED PARTRIDGE of 5 Cannon Street Manchester, in the County of
Lancaster, Engineer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
This invention relates to a means of applying intermittently at such portions of
the work as may be required, and at the will of the operator, the power employed
for propelling machinery.
I attain this object by the means hereinafter described and as illustrated in the
drawings left with the Provisional Specification, in which Fig. 1 is front view and
Fig. 2 is side view representing my invention.
In these views similar letters refer to similar parts.
In this invention I attach to any portion of a machine, of which a may be part
of the side frame, a pulley b which I mount on one end of a shaft c, said shaft
being placed across and transmitting motion to the machine by means of cranks or
by eccentrics or the like.
The power is communicated from the driving shaft to aforesaid pulley preferably
by a belt or strap d.
In order to apply the power at such times only as may be required, I form a
semicircular keyway e in the end of aforesaid shaft c, and in this keyway I insert
the key f, which is formed in the manner shown partly in section in Fig. 3, the
part of said key that is intended to be within the boss 6 of the pulley bhaving a
part thereof cut away so as to leave an edge at each side of the cut portion
of the key, said cut portion being of the same radius as the circumference of the
shaft c.
* I fit securely on the shaft ca disc wheel g, said disc wheel being formed on the
face thereof with a fixed stop 9¹ and an adjustable stop g. The hereinbefore
described key is then slipped into the keyway e with the tail piece that is
attached to the key f resting in the recessed portion of the disc wheel g and
between the stops 91 and 9². I place the pulley 6 on the shaft c and secure said
pulley in position on the shaft by means of the collar h.
1 attach a spindle; to the frame a of the machine, and place thereon a bell
crank ; I also place a treadle at the opposite end of said spindle. By these
means when power is transmitted to the pulley 6 from the driving shaft by the belt
or straps d, said pulley is caused to revolve and during the time the key fis in the
position represented in Fig. 1, with the cut portion f¹ in a line with the circum-
ference of the shaft c, said pulley will revolve without transmitting motion to
the machine.
When the power is required to be transmitted, the treadle is pressed down';'
the tail piece attached to the key will then be caused to fall down on to the
stop g by the spring f, and the edges' will engage with the internal portions of
keyway both in the boss of the pulley b and the shaft c thereby causing said
shaft to revolve until the treadle is released, when by the action of a spring
such as m on the spindle j the end of the bell crank is returned to a vertical
position as shown in Fig. 1, and the tail piece f³ is arrested in its circular
progress, thereby freeing the aforesaid pulley b which will then continue to run
as a loose pulley.
Having now particularly described and ascertained the nature of this my said
invention, and in what manner the same is to be performed, I declare that what
I claim is :-
In machinery that is required to have intermittent motion, the employment of

page_text: mechanism for imparting said motion in the manner substantially as herein before
described and as shown on drawings.
Dated this 1st day of August 1893.
THOMAS PRESCOTT,
53, Arcade Chambers, St. Mary's Gate, Manchester,
Agent for Applicant.