Year: 1895

page_text: Date of Application 4 h May 1895-Accepted, 8th June, 1895
S
I URBAN GUTHING of Wurzbung in the Empire of Germany, Master Cutter
do beicby 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
-
The device which forms the object of this invention and which may be applied
to any sewing machine and thrown into oi out of action at will, renders it possible
to cut off cleanly and with certainty the edges of the material simultaneously when
sewing The invention is also advantageously applicable for cutting out material
and several layers of material may be simultaneously cut with this improved
dev ce
The invention consists essentially of a circular knife et in rapid rotation by
the shaft of the machine which knife is arranged at a suitable distance from the
needle, and may be thrown into and out of action by means of a simple handle
In the accompanying drawings-
Figures 1 and 2 show respectively an elevation and plan of a sewing machine
fitted with the improved device
Figure 3 is a side view of the device
Figures 4 and 5
ale front views showing the device thrown into and out of
action respectively the cover plate being removed in Figure 4
Figure 6 is a side view of the knife together with the knife holder or canner
Figure 7 is a plan of the device and
Ꮀ igure 8 is a section on the line -c of Figure 4
The device is carried by a box or Cising a, which is held securely on the curved
arm of the sewing machine by means of a dovetailed piece b
The circulai
a
knife which is suitably carried by a semi-circula cheek dis mounted on
spindle e which rest in bearings in a frame a¹ a² Ihe circular knife is operated
by means of a gearing c¹ (2 c³ (Figure 2) from the main machine shaft by means of
a belt q which travels over the pulleys c¹ and,
The following arrangement is employed for enabling the cutting device to be
rapidly and safely thrown into or out of action,
A pin Figure 8 is arranged in the box or ca e a on which pin there is mounted
a toothed segment k and a curved cam m The pin carries outside the case a
crank, so that by means of the latter the pin and with it also the toothed
segment k and the curved cam m may be turned The segment k engages with a
rack travelling in a guide piece 12, and the cam m 18 in contact with a pin o
(Figures 4, 5 and 8) of the frame a¹ a²
On the crank being then turned in the duection indicated by the arrow in
Figure 1, the following takes place
The toothed segment k brings the rich into the desired position (Figure >) and
the connecting barn arranged on the end of the rack draws the spindle e and
simultaneously also the sliding bai g' (which is square in section and carries the
cheek d) in their bearings in the direction of the longitudinal axis of the spindle
On the rotation of the crank the cam m is also simultaneously revolved, and lifts
the pin o, so that the latter passes from the position shown in Figure 4 into that
shown in Figure ǝ
The pin o draw upwards with it the fiame a a³ and thus also
the circular knife c in the cheek d On the rotation of the crank h in the direction
of the arrow of Figure 1, the circular knife c is thus both moved to the right and

page_text: simultaneously raised, and is thereby brought into a position in which the needle
of the machine is entirely free, so that the machine may then be used as an ordinary
sewing machine The belt becomes loose on the frame a¹ a² being raised and
thus the circular knife c is brought to a standstill A spring p, Figure 4, is also
simultaneously compressed, and on the crank being turned back, that is to say,
on the device being thrown into gear, automatically presses down the frame a¹ a²
The throwing into and out of gear of the circular 1 nife c may thus be effected with
the greatest ease and rapidity
A regulating screw is connected with the rack so that the distance of the
circular knife from the needle may be exactly adjusted By revolving the screw r,
the thread of which engages in the upper part of the connecting bat n, and which
screw also engages by means of a grooved shoulder with a projection on the
1ack, the relative position between the connecting bar n and the rack is altered
and as the connecting bar moves the encula 1 nife c and the cheek d, an exact
adjustment of the distance between the needle and the circular knife is obtained
If the screw be turned so fu as to encounter the will of the case of the apparatus,
the rack is also moved and the frame a' a² 1 used, thus causing a raising also of
the circular knife
In order to secure the knife in position when thrown into gear (Iigure 1) two
Sciews are provided which when they are tightened, retain the sliding bar g' so
that no shifting of the frame a¹ a² as regards said bir can take place
By means of a screw the whole device which at its part is of a suitable
dovetail shape may be moved up and down It is thus quite possible to so regulate
the adjustment of the device that work may be performed by the same cleanly and
with safety
Having now particularly described and ascertained the nature of my said inven
tion and in what manner the same 13 to be performed, I declare that what I
claim is
-
1 An improved cutting device for sewing machines consisting of a rotatable
Circular knife (e), adapted to be thrown into and out of gear with the machine and
ali inged at a mit ble fistance from the needle whereby the material may be
cleanly and rapidly cut
1
wing machines consisting of a rotatable
and out of gear with th machine and
1 device (1) curved cum (m) anla
- Icht
2 An improved cutting device for
encular mad to be thrown into
having means compri in a crank (h)
Co nuttin ht (n) whereby on turning the crank the sand crcular 1 mfc (c) may be
raised and simult ineon ly moved sideway, tl archy tretching a spring (p) which
on the can' hon moved bacl ain, automatically pic es down the knife
holding frame (at a) with the object of enabling the device to be rapidly and
ea ily brought into such a position that scwin with the machine is not imipe led
substantially as described and illu trited
Dated this 3rd day of May 1895
WM P JHOMPSON & Co,
Of 6, Lord Street, Liverpool, Agents for the Applicant