Improvements in Straight Bar Knitting Frames for Tuck Stitch Work.
Year: 1891

page_text: Date of Application, 29th Apr., 1891-Accepted, 13th June, 1891
AMIDELE DT DUIFICATION.
Improvements in Straight Bar Knitting Frames for Tuck
Stitch Work.
I GOTTHARD LINDEMUTH of Hohenkirchen Saxony, Hosiery Manufacturer, 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:-
My said invention relates to improvements in the arrangement and operation of
the needles in straight bar knitting frames for producing tuck stitch work.
In order to more fully explain my said invention I have appended hereunto a
sheet of drawings to which reference is made in the following description.
In the production of knitted fabrics the hooks of the needles » Figs. 1- and 2 are
pressed down when the new loops are in and the previously formed loops.m Fig. 1
are pushed over the top of the hooks and away from the needle and hang like-m'
over the new loops s which thus form a mesh. If the hook of the needle is not
pressed down before the old loop m is pushed off the latter enters the loop and m
ands form together a double loop m's Figs. 2 and 7 referred to herein as a
tuck stitch and which has hitherto been produced in the manner just described.
For the production of tuck stitch work in accordance with my said invention
I use two needles n n¹ Figs. 3 to 10 one of which is somewhat longer than the
other. The hooks of the needles are also of different lengths so that the
beards or points of the needles all lie in line with each other while the extreme
end or bend of the needle n' projects a little beyond the corresponding part of the
needle n.
These needles are all pressed down and the old loops pushed on to the closed hooks
but are only stripped from the short needles and remain hanging on the long
needles.
The methods of carrying into practice this arrangement of needles will
depend on the particular construction of the knitting frame to which it is to be
applied.
Fig. 3 for instance shows its application to a machine having fixed needles. In
this case the sinkers p only push the old loops so far forwards that they fall from
the short needlen as shown at r and give rise to new meshes o while they remain
hanging on the long needle n¹ as shown at m' and form thereon tuck stitches_when
the nose pl of the sinker p carries the fabric back in the usual manner towards the
left taking with it both the old and the new loops m and s.
Fig. 4 shows the application of my said invention to a machine in which the
needles have a horizontal reciprocating motion. In this case the needles only go so
far towards the comb a which knocks over the loops as that the short needles n alone
enter and have their old loops 7 stripped off the hooks and form new loops o while
the long needles remain out of reach and the loops m remain hanging on
the hooks. On the needles being pushed forwards to the right and while the
fabric is held back both the loops m and s come together and form a tuck stitch.
Figs. 5 and 6 show the application of my said invention to upright needles. The
sequence of operations is exactly the same as in the case of the horizontal needles
described with reference to Fig. 4. The needles are depressed so far against the
dents a a of the knocking over comb as that the tuck stitches ms are formed in
the needle n' and plain loops in the needle n.
If it is required to form plain loops on all the needles it is only necessary to
knock over so far that the fabric is stripped from all the needles as shown in
Figs. 8 and where the needles n n' are depressed so deeply towards the dents a as
that all are stripped and the new loops e are formed. In this case the short needles n

page_text: pull out their loops rather long or draw up the old loops a little between the dents
of the knocking over comb. This is however found to be no detriment as the plain
loops which are thus produced are very uniform.
The long and short needles may be arranged at any desired intervals throughout
the machine.
In order to be able to produce plain or tuck stitch work at will means are provided
for enabling the traverse of the sinkers or the needles to be regulated. This may
be effected in various ways as is well understood. The means I prefer to adopt are
shown in Figs. 10 to 12 as applied to a straight bar knitting frame on Cotton's
principle.
The lever ghi pulls down the needle bar f carrying the needles n n' and is
provided with a double roller t t¹ on the peripheries of the cam u u. The cam is
so shaped and set that the needles are only depressed so far towards the
knocking over cam a as to produce tuck stitches in the manner hereinbefore
described when the roller t is bearing against the part of the cam u but will
depress the needles so far as to strip all the needles and produce plain fabric
when the part of the roller t¹ bears against the part of the cam u'.
The device for shifting the rollers is sufficiently indicated by Figs. 11 and 12
to 10-ire no further description.
To enable the change from plain stitch to tuck stitch or vice versa to take
place automatically various devices may be used as for example the chain 8 shown
in Fig. 12 provided with projections which operate through the levers 675
and 43 on the bar which is provided with projections which form a guide to
receive a stud on the shifting lever swinging in the direction of Fig. 10.
Springs are provided for pulling the bar into its normal position.
The lever i
Fig. 114 shows another arrangement of the alternating device.
in this example is provided with a roller t which may be slid so as to take against
either of the cams u u³ in order to produce plain or tuck stitch work as hereinbefore
described.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :
1. In a straight bar knitting frame the use combination and arrangement of
needles of unequal lengths for producing tuck stitch work substantially as herein-
before described and set forth.
2. In a straight bar knitting frame the use in combination of needles of different
lengths in such a manner that when the fabric is knocked over at one point tuck
stitch work is produced and when knocked over at a greater distance from the
shanks of the needles plain work is produced substantially as hereinbefore described
and set forth.
3. In a straight bar knitting frame the use of needles of unequal lengths provided
with means for varying the extent of the movement required for knocking over so
as to produce tuck stitch or plain work alternately substantially as hereinbefore
described and shown.
Dated this Twenty-eighth day of April 1891.
EDWARD TURNER WHITELOW,
70, Deansgate, Manchester, Agent for the Applicant.