Improvements in and connected with Knitting-machines.
Year: 1895

page_text: Date of Application, 11th Nov., 1895-Accepted, 14th Dec., 1895
COMPLETE SPECIFICATION.
Improvements in and connected with Knitting-machines.
I, HERMANN DONNER, of Chemnitz, in the Kingdom of Saxony, Germany,
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 :-
The needles of knitting-machines are, as is known, siugly movable in suitable
grooves of their beds, and are generally operated by triangular cams moving in a
direction rectangular to that of the needles, and acting upon, or pushing against,
upwardly projecting feet of the latter, such as designated by in Figs. 4, 5 & 7
of the accompanying drawing. In consequence of said manner of transmission of
motion, the feet of the needles are pressed alternately against one and the other of
the side-surfaces of the grooves, or against the bed-ribs forming said grooves
respectively, and there results from the friction thus caused' a great wear and tear
of said ribs.
To make said wear and tear as slight as possible, and to diminish the injurious
consequences of the same in the highest possible degree, the said ribs should
answer a number of requirements; these consist, first, in a highly uniform and
perfect polishing of the side-surfaces of the ribs; second, a great capacity of
resistance of said ribs against being bent or broken; and third, the possibility of
exchanging the said ribs after their wear and tear has finally become too great.
The needle-beds used up to now do not possess ribs of such properties, wherefrom
The
the drawback mentioned at the end of the foregoing paragraph results.
purpose of iny improvements is to do away with said drawback by furnishing the
needle-beds with ribs answering the aforesaid requirements.
'
I have shown my improved bed in the accompanying drawing, in which a
(Figs. 1, 4, 5 & 7) is the bed propor, which is provided with ribs b forming
grooves c. Said ribs are not the ribs proper for the guidance of the needles h;
their only purpose is to form said grooves c, which in their turn receive highly
polished steel-plates de (Figs. 2-7) representing the novel ribs. Each of the
latter does not consist of a single piece, but is composed of two, three or more
parallel pieces arranged side by side, as represented in Fig. 64, 68 and 6º, Fig. 64
showing the rib composed of five pieces, Fig. 6B of two, and Fig. 6c of three.
Eash of said pieces is at its upper end furnished with a downwardly projecting
book taking over the upper edge 2 of the bed a, and has at its lower end a
projection 3 taking into a horizontal groove 4 of said bed. The ribs de are
secured in place by a ledge (Fig. 4) screwed to the lower border of the bed, and
taking over, or pressing upon, said projections 3, 80 that said ribs are firmly pressed
down into the grooves c, or upon the bed a, respectively.
There are two sorts of pieces or plates de, the plates d having at their upper
ends upwardly extending projections d', the plates e, however, being without such
ones. The projections d' of the plates & form the jacks of the needle-bed. It is
generally preferred to let said jacka be smaller than the ribs, and I have therefore
furnished not each of said plates with such a projection d', but only a certain number
thereof. If each rib consists of more than two plates de, it by no means
necessary to arrange the plate d between two plates e, or between two pairs oe
equal groups of said plates; there may as well be used one group or series only for

page_text: each plate d, or, if two groups or series are employed the same may be unequal
ones, as shown as an example in Fig. 6. Owing to the composition of each rib
of two or more of the said plates de, I am enabled to vary the thickness of the
jacks, and yet to obtain a uniform distribution of the same, and I am further
enabled to exchange any rib or any part thereof.
Another improvement consists in arranging in a suitable recess m (Figure 1) of
the ribs ba steel ledge (Figs. 4 & 5), the purpose of which is to hinder the
needles from causing too great a wear and tear of said ribs. The upper surfaces
of these ribs form, as will now be known, the bottoms of the guide-grooves for the
needles, which latter are pressed upon said bottoms by the pull of the ware.
There is consequently a great friction between the needles and the ribs b, which
friction results in a great wear and tear. This drawback is overcome by the
arrangement of said steel-ledge g, which if worn out may be replaced, by
another one.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what. manner the same is to be performed, 1 declare that what I
claim is:
1. In a knitting-machine, a needle-bed having the ribs forming, the guide-
grooves for the needles. composed of two or more parallel plates arranged side by
side, for the purpose, as described.
2. In a knitting-machine, a needle-bed having the ribs forming the guide-
grooves for the needles composed of two or, more parallel plates arranged side by
side; a part of said plates being provided with projections forming the jacks; for
the purpose as described.
3. In a knitting-machine, a needle-bed having the ribs forming the guide-
grooves for, the needles, composed of two groups or series of parallel exchangeable
plates.arranged side by side; each of said groups or series having one of its plates
provided with an upwardly extending projection forming the jack, for the purpose
as described.
11
4. In a knitting-machine, a needle-bed having a steel-ledge or ledges inserted
into the bottoms of the guide-grooves for the needles; said ledge or ledges being
arranged rectangularly to said grooves, at or near the upper ends thereof, for the
purpose as described.
5. In a knitting-machine, a needle-bed having the ribs forming the guide-
grooves for the needles inserted into special grooves formed by special ribs, and
having a steel ledge or ledges inserted into recesses of the latter; said ledge or
ledges being arranged rectangularly to said latter ribs at or near the upper ends
thereof, for the purpose as described.
6. In a knitting-machine, a needle-bed having the ribs forming the guide-
grooves for the needles composed of two or more parallel plates arranged side! by
side, and inserted between special ribs forming the bottoms of said grooves; a
steel-ledge or ledges inserted into recesses of said latter ribs, and arranged
rectangularly to the said grooves at or
near the upper ends thereof, substantially
and for the purpose as described.
Dated this 9th day, of November 1895.
HERMANN DONNER,
By.Geo. H. Rayner,
Agent for the Applicant.