AN IMPROVED MECHANICAL MOTION FOR IMPARTING INTERMITTENT ROTARY ACTION, PARTICULARLY APPLICABLE AS A FEEDING Cin BOD PROVISIONAL SP
Year: 1881

page_text: LETTERS PATENT to Maurice Gandy, of Liverpool, in the County of Lancaster,
for an Invention of "AN IMPROVED MECHANICAL MOTION FOR IMPARTING
INTERMITTENT ROTARY ACTION, PARTICULARLY APPLICABLE AS A FEEDING
Cin BOD
PROVISIONAL SPECIFICATION left by the said Maurice Gandy at the Office
of the Commissioners of Patents on the 25th January 1881.
MAURICE GANDY, of Liverpool, in the County of Lancaster. "AN IMPROVED
MECHANICAL MOTION FOR IMPARTING INTERMITTENT ROTARY ACTION, PARTICULARLY
APPLICABLE AS A FEEDING GEAR FOR SEWING MACHINES, ALSO APPLICABLE
OTHERWISE.'
"
My Invention has for its object the construction of a mechanical motion for
imparting intermittent rotary action (or a similar action to that caused by the
reciprocating movement of a pawl on a ratchet wheel), and consists of what may be
termed a cam-worm or screw, that is, a worm or screw the thread or threads of
which have only pitch on the worm barrel for a certain arc of the periphery
thereof, the pitch being equal to the intermittent movement required. The cam-
worm or screw works a wheel which has rollers or pins on its periphery, which
take into the thread of the cam-worm or screw. Thus the cam-worm or screw
having rotary motion it will impart to the "roller wheel" intermittent rotary
motion, as only that part of the cam-worm or screw which has a pitch acts on the
"roller wheel," and gives movement thereto.
A modification of my Invention may consist in forming cam grooves on the
periphery of a cam worm wheel, into which work pins or rollers pitched on a shaft
or barrel, and arranged to gear into and work the cam worm wheel.
Another modification consists in using a barrel with segments of a worm or
screw thereon, and also segments or projections without pitch. These are arranged
[Prins G71

page_text: to take into and work a worm wheel, the worm or screw segments imparting an
intermittent rotary motion, and the plain projections or segments breaking or
stopping the wheel.
My Invention is particularly applicable as a mechanical movement for imparting
intermittent rotary action to the feed rollers of sewing machines, particularly to
sewing machines used in the manufacture of cotton canvas machine belts, and is
used as a substitute for the ratchet motion.
By the use of my Invention sewing machines having mechanical feeding motion,
being rollers with intermittent rotary motion, can be driven at much greater speed
than heretofore, inasmuch as the mechanical motion of my Invention is a smooth
working motion as against the blow or strike motion of a ratchet gear.
It will be evident that the mechanical motion according to my Invention can be
applied as an intermittent rotary motion to machines other than sewing machines
where such a motion is required.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Maurice Gandy in the Great Seal Patent Office on the 23rd July
1881.
MAURICE GANDY, of Liverpool, in the County of Lancaster. "AN IMPROVED
MECHANICAL MOTION FOR IMPARTING INTERMITTENT ROTARY ACTION, PARTICULARLY
APPLICABLE AS A FEEDING GEAR FOR SEWING MACHINES, ALSO APPLICABLE
OTHERWISE.'
دو
My Invention has for its object the construction of a mechanical motion for
imparting intermittent rotary action (or a similar action to that caused by the
reciprocating movement of a pawl on a ratchet wheel), and consists of what
may be termed à cam-worm or screw, that is, a worm or screw the thread or
threads of which have only pitch on the worm barrel for a certain arc of the
periphery thereof, the pitch being equal to the intermittent movement required.
The cam-worm or screw works a wheel which has rollers or pins on its periphery,
which take into the thread of the cam-worm or screw. Thus the cam-worm or
screw having rotary motion it will impart to the roller wheel intermittent rotary
motion, as only that part of the cam-worm or screw which has a pitch acts on the
roller wheel and gives movement thereto.
The beforegoing being the nature and object of my Invention, I will now proceed
to more particularly describe the nature of the same, and for that purpose I have
hereunto attached two Sheets of Drawings, marked with letters and figures of
reference corresponding with those in the following explanation, like letters and
figures being used to denote the same or corresponding parts throughout the
various views.
In the Drawings,-
Figure 1 is an elevation of a cam-worm and wheel constituting the mechanical
motion according to my Invention.
Figure 2 is a flattened out plan of the cam-worm, Figure 1.
Figure 3 is a side elevation partly in section of a modification of my Invention.
Figure 4 is a side view partly in section of part of Figure 3.
Figure 5 is a plan of the cam wheel, Figure 4.
Figure 6 is a side view partly in section of part of Figure 3.
Figure 7 is a plan of the wheel, Figure 6.
Figure 8 is a modification of Figure 3.
Figure 9 is a side elevation of a sewing machine with my Invention applied
thereto.
Figure 10 is one end elevation of Figure 9.
Figure 11 is the other end elevation of Figure 9.
Figure 12 is a section at X, X, Figure 9.
Upon reference to Figures 1 and 2, my Invention consists of the cam-worm or
screw A, and the roller toothed wheel B, which together form a mechanical motion
for imparting intermittent rotary action. It will be seen that the thread C and
the groove D of the cam-worm have only a pitch E on the worm barrel A for a
certain arc of the periphery thereof, the pitch E being equal to the advance or
intermittent movement required. The cam-worm A works the wheel B which bas
rollers or pins F on its periphery, which take into the thread or groove D of the
cam worm A, as shown at Figure 1. Thus, the cam-worm A having rotary motion,
it imparts to the roller wheel B intermittent rotary motion, as only the pitch E of
the cam-worm A acts in advancing the roller wheel B. The straight portion of
the thread or groove D acts as a brake to the roller wheel B.
A modification of my Invention, as illustrated at Figures 3, 4, 5, 6, and 7 consists
in forming cam-grooves H with the required pitch on the periphery of the wheel J

page_text: and grooves K, without pitch on the periphery of the wheel L. The advance
movement is obtained by the pin or roller M on the barrel N, working into the
cam grooves H, and the motion is arrested by the straight portion of the cam
groove H, and continued by the feather P, which takes into the groove K of
the wheel L, as shown at Figure 3. The wheels L, J, are coupled together and
keyed on the same shaft, and the shafts N' and P₁ are also geared together and
arranged so that when the pin N is leaving the straight part of the groove H the
feather P enters the groove K.
In the modification shown at Figure 8 the wheel L is placed above the wheel K,
and the pin M and the feather P are on the same shaft.
My Invention is particularly applicable as a mechanical movement for imparting
intermittent rotary action to the feed rollers of sewing machines, particularly to
sewing machines used in the manufacture of cotton canvas machine belts, and is
used as a substitute for the ratchet motion.
In the example of the application of my Invention shown at Figures 9 and 10,
it will be seen that the mechanical movement, namely, the worm A and wheel B is
used to impart intermittent rotary motion to the feed rollers R, S, of the sewing
machine. The wheel B is keyed to the lower feed roller S, and receives motion
from the shaft of the sewing machine through the bevel gear T.
By the use of my Invention, sewing machines having mechanical feeding motion,
being rollers with intermittent rotary motion, can be driven at much greater speed
than heretofore, inasmuch as the mechanical motion of my Invention is a smooth
working motion, as against the blow or strike motion of a ratchet gear.
It will be evident that the mechanical motion according to my Invention can be
applied as an intermittent rotary motion to machines other than sewing machines,
where such a motion is required.
Having now described and ascertained the nature, object, and purposes of my
Invention, what I claim as my Invention and secured to me by Letters Patent as
aforesaid is,
First. Effecting an intermittent rotary action from a continuous rotary action by
means of a cam-worm, such as A, and a roller toothed wheel, such as B, as herein
described and shown at Figures 1 and 2 of the Drawings hereto annexed.
Second. The mechanical motion for imparting intermittent rotary action from a
continuous rotary movement, as herein described and shown at Figures 1 and 2 of
the Drawings hereto annexed.
Third. The combination of the cam-worm, such as A, with a wheel having
rollers or pins for its teeth, as herein described and shown at Figures 1 and 2 of
the Drawings hereto annexed.
Fourth. The mechanical motion for imparting intermittent rotary action from a
continuous rotary movment, as herein described and shown at Figures 3, 4, 5, 6,
7, and 8 of the Drawings hereto annexed.
Fifth. In sewing machines of the type herein set forth, the use of the mechanical
movement herein described for imparting intermittent rotary action to the feed
rollers of the sewing machines, and arranged as herein described and shown at
Figures 9, 10, 11, and 12 of the Drawings hereto annexed.
In witness whereof, I, the said Maurice Gandy, have hereunto set my hand
and seal, this Twenty first day of July, in the year of our Lord One
thousand eight hundred and eighty one.
-זבוז-
AT17
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AGNVO (7) NO