Improvements in Looms for the Manufacture of Tufted or Pile Fabrics.
Year: 1892

page_text: Date of Application, 30th Dec., 1892
Complete Specification Left, 28th Sept., 1893-Accepted, 28th Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements in Looms for the Manufacture of Tufted or Pile
Fabrics.
We BRINTONS LIMITED of Kidderminster in the County of Worcester, Carpet
Manufacturers and THOMAS GREENWOOD of The Shrubbery, Wolverley, near
Kidderminster aforesaid, Mechanic, do hereby declare the nature of this invention
to be as follows:-
Our invention has reference to looms for the mauufacture of tufted or pile fabrics
and more particularly of carpets or fabrics of the kind known as Royal Axminster
or Moquette, and the improvements specially relate to the mechanism or means for
severing or cutting the tuft yarns after a sufficient length of same has been given
off by the carriers to the grippers.
When the cutting mechanism comprises a pair of cutters of the horse clipper type
such as those described in Specification No. 15680 of 1890, the traversing cutter
which extends right across the machine requires considerable power to work; it
cannot be readily removed for attention or repairs or again readily replaced, it is
not easily adjusted to a suitable pressure or tension against the fixed cutter from
end to end, and it does not always cut keenly clear through the yarn and has
therefore a tendency to drag the fibre.
Now the object of this invention is to overcome these drawbacks. With this
object we employ in lieu of the traversing cutter having a number of teeth or
blades as in that described in the said former Specification a single sliding knife or
cutter which is caused to run along the whole length of the fixed cutter, that is to
say across the whole width of the set of yarns lying between the teeth or blades of
the fixed cutter.
According to one way in which the invention can be carried into effect the
sliding knife or cutter is preferably held by being let into a vertical groove in a
dovetail block which is movable to and fro, by any suitable device worked by the
loom, along a dovetail guide to which the fixed cutter is fixed. The dovetail
block is adjusted to the dovetail guide by means of an inclined piece which is
attached to the said block by screws and set up by other screws.
The sliding
cutter is kept pressed against the fixed cutter by a spring plate the pressure of
which is regulated by a screw.
Sometimes, more particularly when the loom is wide, we employ instead of one
sliding knife running along the whole length of the fixed cutter two or more sliding
knives each of which runs for only part of the length of the fixed cutter.
These
knives may both (or all) work in the same direction, or they may work in different
directions, and in the case of two being used they may meet in the middle.
The cutting edges of both the fixed and the sliding knife preferably form the
under edges instead of the upper edges as has hitherto been usual; any fluff or
small pieces of yarn that may become detached will therefore be less liable to
remain in the cutter teeth and so interfere with the cutting operation.
The cutting edge of the sliding knife should be inclined or rounded.
Dated this 30th day of December 1892.
J. C. MEWBURN,
55 & 56, Chancery Lane, London, Chartered Patent Agent.

page_text: :
Improvements in Looms for the Manufacture of Tufted or Pile
Fabrics.
We, BRINTONS LIMITED of Kidderminster in the County of Worcester, Carpet
Manufacturers, and THOMAS GREENWOOD of The Shrubbery Wolverley near
Kidderminster aforesaid, Mechanic, 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 :-
:
Our invention has reference to looms for the manufacture of tufted or pile fabrics
and more particularly of carpets or fabrics of the kind known as Royal Axminster
or Moquette, and the improvements specially relate to the mechanism or means for
severing or cutting the tuft yarns after a sufficient length of same has been given
off by the carriers to the grippers.
When the cutting mechanism comprises a pair of cutters of the horse clipper type
such as those described in Specification No. 15680 of 1890 the traversing cutter
which extends right across the machine requires considerable power to work, it
cannot be readily removed for attention or repairs or again readily replaced, it is
not easily adjusted to a suitable pressure or tension against the fixed cutter from
end to end and it does not always cut keenly clear through the yarn, and has
therefore a tendency to drag the fibre.
Now the object of this invention is to overcome these drawbacks. With this
object we employ in lieu of the traversing cutter having a number of teeth or
blades as in that described in the said former Specification a single sliding knife or
cutter which is caused to run or slide along the whole length of the fixed cutter,
that is to say across the whole width of the set of yarns lying between the teeth or
blades of the fixed cutter.
One way in which the invention can be carried into effect is illustrated in the
accompanying drawings
Figure 1 being a front elevation showing the sliding cutter and part of the fixed
cutter and Figure 2 being a section on the line x-x of Figure 1.
a is the fixed cutter having a number of teeth as shown between which teeth the
yarns lie. bis the sliding cutter; it is preferably held as shown by being let into
a vertical groove c in a dovetail block d which is movable to and fro, by any suitable
device worked by the loom, along a dovetail guide e to which the fixed cutter a is
fixed. The dovetail block d is adjusted to the dovetail guide e by means of an
inclined piece which is attached to the said block by screws g g and set up by
other screws hh. The sliding cutter is kept pressed against the fixed cutter by
. a spring plate i the pressure of which is regulated by a screw k.
Sometimes, more particularly when the loom is wide, we employ instead of
one sliding knife b running along the whole length of the fixed cutter two or more
sliding knives each of which runs for only part of the length of the fixed cutter.
These knives may both (or all) work in the same direction or they may work
in different directions, and in the case of two being used they may meet in the
middle.
The cutting edges of both the fixed cutter a and the sliding cutter 6 preferably
form the under edges as seen in the figures instead of forming the upper edges as
has hitherto been usual; any fluff or small pieces of yarn that may become
detached will therefore be less liable to remain in the cutter teeth and so interfere
with the cutting operation. But the cutting edges may form the upper edges if
desired.
The cutting edge of the sliding knife should be inclined as shown or rounded.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim in respect of looms for the manufacture of tufted or pile fabrics is :-
1. In tuft yarn cutting mechanism of the horse clipper type, the combination
with a fixed cutter having a number of teeth or blades and extending across the
whole width of the set of yarns, of a sliding cutter having only a single blade or
knife and made to traverse along the whole length of the fixed cutter, substantially
as and for the purpose hereinbefore described.
2. In tuft yarn cutting mechanism of the horse-clipper type, the combination
with a fixed cutter having a number of teeth or blades and extending across the
whole width of the set of yarns; of two or more sliding cutters each of which has
only a single blade or knife and is made to traverse along a portion of the fixed
cutter not traversed by the other sliding cutter or cutters substantially as and for
the purpose herein before described.
3. In tuft yarn cutting mechanism of the horse clipper type the particular mode
of mounting and adjusting the sliding cutter substantially as herein before described
and shown in the accompanying drawings.
DL:
1000
J. C. MEWBURN,
55 & 56, Chancery Lane, London, Chartered Patent Agent.