Improvements in Sewing Machines.
Year: 1890

page_text: Date of Application, 10th June, 1890
Complete Specification Left, 10th Mar., 1891-Accepted, 9th May, 1891
PROVISIONAL SPECIFICATION.
Improvements in Sewing Machines.
THOMAS MARSDEN COCKROFT of 12 Commercial Street Leeds and ROGER
FARMER of 16 School Croft Sheffield in the County of York do hereby declare
the nature of this invention to be as follows :-
This invention relates to sewing machines, and has for its object the construc-
tion of an attachment to be secured to the needle bar of a sewing machine;
adapted to carry two needles in alignment, both or either of which may be
rendered operative or inoperative at the will of the operator, by means hereinafter
described.
In sewing two rows of stitches simultaneously with the needles in alignment, it
is impossible to turn the material at, or near a right angle to the first row of
stitches, without leaving a space unstitched by one needle or in the alternative,
there is a redundancy of stitches made by the other needle.
We obviate these difficulties without unthreading the needle by securing to the
needle bar of a sewing machine a right angled frame with guide checks. In the
angle of this frame, we insert two independent blocks, each carrying a needle;
both blocks have camways formed on the side next the frame, said camways are
engaged by bolts passing through the guide checks and frame, upon said bolts
being shot the respective needle blocks are lifted vertically, whereby the needles
are rendered inoperative, when the bolts are withdrawn the said blocks are locked.
in operative position.
Each needle block with its corresponding bolt can be actuated independently
of the other; that is to say, one needle block may be operative and the other
inoperative.
Either of the said needle blocks may be bored out to form a channel to guide
the thread to the needle eye.
Dated this Ninth day of June 1890.
THOMAS MARSDEN COCKROFT.
ROGER FARMER.
COMPLETE SPECIFICATION.
Improvements in Sewing Machines.
THOMAS MARSDEN COCKROFT of 12 Commercial Street Leeds and ROGER
FARMER of 16 School Croft Sheffield both in the County of York 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 sewing machines and has for its object the construction
of an attachment to be secured to the needle bar of a sewing machine, adapted to
carry two needles in alignment, both or either of which may be rendered operative
or inoperative at the will of the operator by means hereinafter described.
On sewing two rows of stitches simultaneously with the needles in alignment,
it is impossible to turn the material at, or near a right angle, to the first row of
stitches, without leaving a space unstitched by one needle, or in the alternative,
there is a redundancy of stitches made by the other needle.
We obviate these difficulties without unthreading the needle, by securing to the
needle bar of a sewing machine a right angled frame, with guide cheeks. In the

page_text: angle of this frame, we insert two independent blocks, each carrying a needle ;
both blocks have camways formed on the side next the frame; said camways are
engaged by bolts passing through the guide cheeks and frame; upon said bolts
being shot the respective needle blocks are lifted vertically, whereby the needles
are rendered inoperative; when the bolts are withdrawn the said blocks are locked 5
in operative position.
Each needle block with its corresponding bolt can be actuated independently
of the other that is to say-one needle block may be operative and the other
inoperative.
Either of the said needle blocks may be bored out to form a channel to guide 1
the threads to the needle eye.
We will now proceed to describe our invention with reference to the sheet of
drawings hereto annexed, in which corresponding letters denote corresponding
parts in all the figures.
Fig. 1. an elevation with both needles in stitching position.
Fig. II. an elevation with right hand needle inoperative.
Fig. III. an elevation with left hand needle inoperative.
Fig. IV. a plan.
Fig. V. views of rectangular frame.
Fig. VI. views of left hand needle block.
Fig. VII. views of right hand needle block.
Fig. VIII. views of bolts.
Figs. IX. & X. views of guide checks.
1
2
A, is the needle bar, the rectangular frame secured to same by screws c, to
each end of said frame b, we fix guide checks d and d', within the angle of said 2
frame and inside the guide cheeks d and d, we insert needle blocks e and el, said
needle block e is bored out to form a channel e, through which both threads pass
to the needles, said needle blocks e and e¹ are lifted vertically by shooting
bolts and said bolts engage camways 9 and g¹ formed on the blocks, upon
the side next the rectangular frame; said bolts pass through slots and h in 3
guide cheeks d and d¹ and through the openings i and in the frame b.
Flat springs and are fixed to the sides of bolts and f¹ and take into
recesses and in rectangular frame b.
Dotted line in Fig. 1. represent the normal position of the needles-when
the loops are formed and both needles stitching simultaneously.
In Fig. 1. the right hand needle, and on Fig. III. the left hand needle; are
shown inoperative, with their respective loops lifted above the dotted line xx.
3
The hereinbefore described attachment is operated in the following manner.
When a square corner to the right hand of the double line or stitching has to
be formed, the bolt is shot raising the needle block e; then two or more 4
stitches are made by the left hand needle, when this is accomplished, the material
is turned to the right hand, whilst the left hand needle is in the work and acting
as a pivot upon which to turn the work; two or more stitches are now made by
the operative needle, thereupon the bolt is withdrawn bringing the needle
block e into operative position for both needles to stitch simultaneously.
In forming a square corner to the left hand the bolt fis shot raising the left
hand needle, two or more stitches are now made by the right hand needle, the
material is thereupon turned to the left upon the pivot formed by the right hand
needle being in the material, two or more stitches are made until the two rows of
parallel stitching are opposite, then the bolt is withdrawn to bring needle block.e
into operative position and for both needles to stitch simultaneously.
Having now particularly described-and- ascertained_the_nature of our inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is-
In a sewing machine for stitching two parallel rows simultaneously.
Firstly An anuliance or attachment for the needle bar of a sewing machine.

page_text: carrying two needles in alignment, either of said needles being movable vertically
and independently of the other, whereby square or approximately square corners
are stitched, without breaking or unthreading the needle thread, substantially as
specified and illustrated in the drawings Fig. I. to X.
Secondly-The combination in an attachment for securing to the needle bar
of a sewing machine, of a rectangular frame b, having slots hand with guide
cheeks d and d, and needle blocks e and e', said blocks having camways 9 and gl
with bolts and f, said blocks being raised vertically by shooting bolts and fi
and locked by withdrawing said bolts as specified.
Dated this the Ninth day of March 1891.
THOMAS MARSDEN COCKROFT.
ROGER FARMER.