Improvements in Button-hole Attachments for Sewing Machines.
Year: 1892

page_text: Date of Application, 2nd July, 1892-Accepted, 20th Aug., 1892
COMPLETE SPECIFICATION.
Improvements in Button-hole Attachments for Sewing Machines.
I, CARL AUGUST HAUPT of 5 Erlen Strasse, Dresden, N., Saxony, in the
German Empire, Mechanician, do hereby declare the nature of my said 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 my invention is to manufacture an apparatus suitable for sexing
and barring button holes, when attached to at Singer(preferably) sewing
machine; such apparatus being capable of being readily attached to, and removed
from the head of the bracket arm, as required, without interfering with the
effectiveness of the sewing machine for ordinary work. The only necessary
alterations in the sewing machine are dowel and screw holes in the bracket arm
head an additional needle groove, and a slot in the bed plate.
And in order that my said invention may be particularly described and ascer-
tained, reference is hereby made to the accompanying drawings, in which similar
figures of reference indicate corresponding parts.
Fig. 1 is a back view of the apparatus, partly in section.
Fig. 2 is a side view.
Fig. 3 is a view of the opposite side to that shown in Fig. 2.
Figs. 4 to 12 are detail views and sections.
1, is the head of the bracket arm of the sewing machine. 2, is the presser bar,
and 3 is the presser foot. 4 is the bed plate. is the needle bar and 6 is a
carrier plate secured to the head of the bracket, by one or more screw or screws."
and dowels.
The needle holder consists of a block 7, secured to the needle bar 5 by a
screw 8. as shown in Figs. 1, 4, and 5; and, in section on the line ab, in Figs. 6
and 7. 10 is a slide to which the needle 9 is clamped. 11 is a pin attached to
the slide 10 projecting through a slot in the block 7, by which pin the needle is
carried to and fro. Two countersunk holes are made in the slide 10 to receive the
point of the spring bolt 12.
The stitching and barring of the button hole is effected by the movements of
the needle laterally, the slide 10 being held stationary at the end of each movement,.
so as to obtain "dwell" while the needle bar descends and rises again. In one
position the needle penetrates the material, and in the other it enters the button
hole, as shown in Figs. 4 and 6 in one position, and in Figs. 5 and 7 in the other
position. 13, 13, are two levers pivoted at 14 to the plate 6. The upper ends of
these levers are linked together by a connecting rod 15 pivoted at 16. The lower
ends of the levers have segmental grooves or notches 17, whereby they seize and
control the movements of the pin il fitted to the slide 10, 18, 18, are a pair of
steel wire springs secured to the plate 6 by a screw 19. One end of each of these
springs is carried in a horizontal direction to a shoulder formed at the upper end
of each lever 13. The tendency of these springs is to return the levers 13 to the
position shown in Figs. 3, 10, and 11. 22 is a bolt fitted in a vertical sheath 23.
This bolt carries a horizontal fork 25, to which a handle 24 is attached. 21 is an
arm attached to the fork 25. 26 is a spring fitted in the sheath 23, pressing the
bolt 22 downwards. An opening is formed in the sheath 23 leaving a shoulder 27,
whereby the operator is enabled to raise the arm 21 off the work, that is to say,
from the position shown in Figs. 1, 3, 4 and 5, to that shewn in Fig. 2. 20 is a
thin guide plate fixed to the sheath 23, for guiding the pin 11 and needle 9 to the
two positions shown in Figs. 4 and 5.
The action of the apparatus will be understood from the drawings. The needle 9
is first placed in position in the button hole, the presser foot 3 and arm 21 being

page_text: down. The needle bar 5 then descends and rises again. The pin 11 then comes
in contact with one of the notches 17 in the levers 13. The lever is thereby
rotated upon its pivot, and at the same time, it pushes the pin li and block 10, and
carries the pin 11 to the other side of the guide plate 20. The needle bar then
descends and rises again, completing the stitch and bar. 29 is a grooved guide for
the needle, which enters the guide previously to its penetrating the material.
28 is a small projection which keeps the button hole open when working.
The movements of the material, while being sewn, are effected in the usual
manner, by means of a feed and presser foot 3.
In order to put the apparatus out of action a button 30 attached to a rod is
provided. On pressing this button inwards it places the levers 13 in the position
shown in Fig. 9. The needle is then free to move up and down on the side of the
plate 20 shewn in Fig. 9.
The various movements of the pin 11 will be understood on reference to Figs. 8,
9, 10, and 11'; and the partly finished button hole is shewn in Fig. 12.
Having now particularly described and ascertained the nature of my inven-
tion, and in what manner the same is to be performed declare that what I
claim is
-
1. In button-hole attachments for sewing machines as aforesaid the combination
with the needle bar 5 of the block 7, slide. 10 carrying the needle 9 and pin 11;
the reciprocating motions of the sliding needle holder 10 being regulated in lateral
extent by the spring bolt 12; levers 13, 13, and guide plate 20; all severally and
collectively operating substantially as hereinbefore described and illustrated by the
drawings.
2. In button-hole attachments for sewing machines as aforesaid, the combination
of the appliances mentioned in the first claim with a spring bolt 22 carrying the
arm 21, guide 29, and projection 28, all severally and collectively operating sub-
stantially as herein before described and illustrated by the drawings.
3. The general construction, arrangements, and combinations of the several and
respective parts together constituting my invention of improvements in button-hole
attachments for sewing machines, substantially as herein before described and
illustrated by the drawings.
Dated July 2nd 1892.