Improved Presser Clamp for Button Hole Sewing Machines.
Year: 1896

page_text: VISIONAL SP
TION.
Improved Presser Clamp for Button Hole Sewing Machines.
We, HOPE STREET FACTORY LIMITED of Hope Street Belfast and JOHN
LAIRD of 4 Hibernia Place, Lisburn Road, Belfast Engineer do hereby declare
the nature of this invention to be as follows:-
In order that the presser clamp of a button hole sewing machine may move
freely both lengthwise and laterally and bear with even pressure on material of
irregular thickness than has heretofore been the case it is provided on the upper
side with a small lug at each end and equidistant from either side. These lugs are
drilled to receive binge pins secured in corresponding lugs on the upper side of a
frame which carries and surrounds the presser clamp: sufficient clearance being
left between the sides of the presser clamp and the frame to allow the presser
clamp to vibrate on the hinge pins. On the upper side of the frame at the sides
and equidistant from either end are two other lugs. These lugs are drilled to
receive hinge pins, secured to the upper side of the clamp plate which is attached
to the machine in the ordinary way or in any convenient manner sufficient clearance
being left between the ends of the frame and the clamp plate to allow the frame to
vibrate on the hinge-pins on the clamp plate. Thus the presser clamp with the
frame is free to vibrate iu one direction within the clamp plate, while at the same
time the presser clamp is free to vibrate within the frame in a direction at right
angles to the vibration of the frame within the clomp plate.
The same result may be obtained by fitting the presser clamp with hinge pins at
each side instead of at each end within the frame while the frame is fitted with
hinge pins at each end instead of at each side within the clamp plate.
Dated this 20th day of Anvil 1896
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents.
COMPLETE SPECIFICATION.
Improved Presser Clamp for Button Hole Sewing Machines.
We, HOPE STREET FACTORY, LIMITED, of Hope Street, Belfast, and JOHN
LAIRD, of 4 Hibernia Place, Lisburn Road, Belfast, 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 :-
The object of our invention is to enable the presser clamp of a button hole
sewing machine to move more freely than has heretofore been the case, hoth
lengthwise and laterally and bear with even pressure on material of irregular
thickness as for instance in the case of shirt parts where there is an extra thickness
of material near the front collar button hole of a shirt front at the point where the
collar or collar band is attached to the front or similarly in a cuff where at the stud
holes the interlining is cut away and thus thinned to allow the stud to be more

page_text: easily inserted. With this view we hinge the presser clamp to a frame said frame
being hinged to the clamp plate in such a manner that the presser clamp with the
frame is free to vibrate in one direction or plane within the clamp plate, while at
the same time the presser clamp is free to vibrate within the frame in a direction
or plane at right angles to the vibration of the frame within the clamp plate.
We will now proceed to describe with reference to the accompanying drawings
the manner in which our invention is to be performed.
Fig. 1 is a plan of the clamp plate showing the presser clamp and frame in place
as applied, for example, to a button hole sewing machine described in Patent
Specification No. 11,876 dated the 19th of June 1894.
Fig. 2 is a section on the line 2-2 Fig. 1.
Fig. 3 is a section on the line 3-3 Fig. 1.
The presser clamp is provided on the upper side with a small lug u at each,
end and equidistant from either side. These lugs are drilled to receive hinge
pins u secured in corresponding lugs on the upper side of a frame u which
carries and surrounds the presser clamp u. Sufficient clearance is left between the
sides of the presser clamp u and the frame u to allow the presser clamp to vibrate
on the hinge pins u². On the upper side of the frame u at the sides of the same
and equidistant from either end are two other lugs which are drilled to receive
hinge pins secured to the upper side of the clamp plate U or the lugs u' thereon.
Sufficient clearance is left between the ends of the frame u and the clamp plate U
to allow the frame to vibrate on the hinge pins on the clamp plate.
The clamp plate may be attached to the machine in the ordinary way or in any
convenient manner.
The same result may be obtained by fitting the presser clamp u with hinge pins
at each side instead of at each end within the frame a while the frame u is fitted
with hinge pins at each end instead of at each side within the clamp plate U.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. The application and use in a button-hole sewing machine of a presser clamp
pivotted in a frame which is also pivotted in such inauner as to permit of the said
presser clamp moving in more than one plane substantially as aud for the purpose
set forth.
2. The construction of presser clamp shown on the drawing.
June 1890.
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents.