IMPROVEMENTS IN SEWING MACHINES
Year: 1885

page_text: We FRIEDRICH QUENSTEDT and ROBERT GELLERT, Engineers, of the City of
Berlin, do hereby declare the nature of said invention for "IMPROVEMENTS IN
SEWING MACHINES" to be as follows:-
Our invention has reference to certain parts of a sewing machine for driving the
shuttle and the feeder for feeding the fabric to be sewn, and the object in view is
the production of a simple and easy working machine.
The motion for driving the shuttle and feeder is obtained from a double cranked
shaft mounted in the upper part of the machine, the crank pins of which are
respectively connected with the crank pins of two lower shafts by means of con-
necting rods. Upon the rotation of the upper shaft an oscillating motion is
communicated to the two lower shafts one of which is hollow and the other
carried through the same. One of the lower shafts carries an eccentric for lifting
the feeder and a shuttle carrier, the other lower shaft carries an eccentric for
pushing forward the feeder.
The shuttle guide in which the shuttle,-held in a carrier-oscillates consists of
a plate and a ring screwed thereto. The shuttle plate is provided with a channel
for the passage of the needle, and the shuttle as it comes with a flat surface against
this plate passes the needle channel like an ordinary shuttle. The shuttle ring is
adjustable on the shuttle plate by means of enlarged screw holes. The shuttle
carrier is provided with a spring socket so that it may be drawn back from the
shuttle guide to allow of the shuttle being readily withdrawn.
The needle rod is operated by the upper shaft through cam mechanism and the
needle after lifting of loop and return remains so long in the needle channel until
the shuttle shall have passed the loop. The drawing together of the loop thread
is effected by the thread lever upon the arrival of the shuttle at is end position.
Dated this and dex of Ontober 1885

page_text: We, FRIEDRICH QUENSTEDT and ROBERT GELLERT, Engineers, of the City of
Berlin, do hereby declare the nature of said invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement :-
Our invention has reference to certain parts of a sewing machine for driving the
shuttle, and the feeder for feeding, or pushing forward the fabric to be sewn, the
object in view being the production of a simple and easy working sewing machine.
Referring to the accompanying drawings:-
Fig. 1 is a part sectional side elevation of a sewing machine to which our
invention has been applied. Fig. 2 is a cross section of the needle plate taken
through the line A-B of Fig. 1, and shews the shuttle a the shuttle guide con-
sisting of the plate h, and ring i and also the arrangement of the shuttle in the
oscillating shuttle holder k. Fig. 3 is a cross section of the needle plate taken
through the line C D of Fig. 1 shewing the position and moving parts of the
feeder b behind the shuttle plate h. Fig. 4 is a section taken through the line E F
of Fig. 1 shewing the position of the shafts and their connection by means of
cranks and connecting rods. Fig. 5 is a section taken through line G H of Fig. 2
and shews the method of mounting and guiding the shuttle between the shuttle
plate adjustable ring i and shuttle holder k.
The motion for driving the shuttle a and feeder b is obtained from an upper
double cranked shaft c (Figs. 1 and 4) the crank pins of which are respectively
connected with the crank pins of two lower shafts ƒ and g by means of connecting
rods d, d. Upon the rotation of the shaft c an oscillating motion is communicated
to the two shafts f and g, and in order that the shock or vibration due to this
motion may be reduced to a minimum and the respective working parts may be
balanced the cranks and connecting rods between the upper shaft c and the lower
shafts and g are made of similar length and strength and the shafts ƒ and g are
carried in the same axial line for which latter purpose, the shaft f is made hollow
and the smaller portion of the shaft g carried through the same.
The shaft f.is
mounted in the shuttle plate h and bearing 1; at the left hand end behind the
shuttle plate it carries an eccentric m for lifting the feeder b and at the other side
of the shuttle plate h the shuttle holder k. The shaft g is carried by its ends in
bearings, on it is mounted the eccentric n, for pushing forward the feeder b
and effects this motion only of the eccentric n, being for this purpose connected
through connecting parts with the right hand crank pin of the shaft c which must
stand at an obtuse angle to the left hand crank pin of the same shaft. The
arrangement of the feeder b and stitch adjusting screw o is known and not novel.
The shuttle guide in which the shuttle a oscillates with the shuttle holder k
consists of the plate h and of the ring i screwed thereto. The shuttle plate is
provided with a channel for the passage of the needle; and the shuttle a as it lies
or bears with its flat side against this plate passes by, and over the needle channel
like an ordinary shuttle. The guidance of the shuttle a over the shuttle plate h
is effected by means of the ring i and shuttle holder k as shewn in Figs. 2 and 5.
The ring i is furnished with enlarged screw holes (Fig. 2) to allow of it being

page_text: adjusted on the shuttle plate so as to get the required distance between the shuttle
and shuttle holder for the motion of the shuttle and passage of the thread. The
shuttle holder k is provided with a spring socket (Fig. 1) so that when this is
pressed back on its spring the shuttle holder k may be drawn back and free access
be had to the shuttle for its removal or other purposes. The position and arrange-
ment of the shuttle way presents the particular advantage that it may be easily
overlooked and the motion of the shuttle observed by the operator upon opening
the cover plate when the shuttle itself is accessible to the hand.
To render the sewing operation clear it is to be observed that the needle rod is
operated by the upper shaft c through cam mechanism and the needle after lifting
of loop and return, remains so long in the needle channel until the shuttle shall
have passed the loop. The drawing to of the loop thread is effected by the thread
lever upon the arrival of the shuttle in the position shewn in dotted lines in Fig. 2,
being the end position of the same. The commencing position of the shuttle being
shewn in Fig. 2 in full lines.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:
1. The arrangement of the shuttle guide consisting of the plate hand adjustable
ring i in combination with the shuttle a lying flat thereon, on the right hand side
of the needle, as from the operator, substantially as described and illustrated.
2. The method of driving the shuttle between the shuttle plate h adjustable
ring i and shuttle holder k substantially as described and illustrated.
3. The arrangement of the shaft g within the hollow shaft f for driving the
shuttle and feeder substantially as described and illustrated.
4. The combination with the shafts ƒ and g of the shaft c by cranks o and c¹
and connecting rods d and substantially as described and illustrated.
5. The method of adjusting the engaging point of the eccentric rod n¹ with the
lever n by means of the knob r in combination with the screw q, nut tand
eccentric rod pin 8, for the purpose of allowing of a stitching plate over the machine
plate in the case of the feeder arrangement referred to in claim 5, substantially as
described and illustrated.