Improvements in the Construction of Knives for Cutting the Pile of Velvets and other Pile Fabrics.
Year: 1891

page_text: Date of Application, 4th Aug., 1891
Complete Specification Left, 4th May, 1892-Accepted, 30th July, 1892
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Knives for Cutting the Pile
of Velvets and other Pile Fabrics.
I JAMES HOYLE SMITH of 8 Abbey Grove, Eccles in the County of Lancaster,
Fustian Cutter, do hereby declare the nature of this invention to be as follows:-
This invention relates especially to the knives, for cutting the pile of velvets
and other pile fabrics, for which Letters Patent No. 16996 were granted to myself,
Andrew Goddard, Lloyd Higginbottom and Thomas Mannock dated the 10th day
of December 1887.
My invention is also applicable to other fustian cutting knives of similar
construction.
'
In the first place I mount a small tail-piece at the end of the trigger or pusher
by which the knife is released in case the point passes through the back of the
cloth.
This tail-piece is pivotted to the trigger or pusher, and projects both in front of
and behind its pivot, preferably more at the front than behind, and it is so formed
that it fits in or on the guide and is pointed so that the cloth (if the point of the
said guide goes through it) cannot get between the trigger and the guide but will
run up the tail piece and move with it as it is pushed backwards to release the
trigger or pusher, and not move as is at present the case, upon the surface of the
guide.
As the tail piece is continued below and beyond its pivot there is no tendency
for its point to rise from the guide.
When the trigger or pusher has released the knife a spring causes the latter to
be withdrawn from the cloth as usual.
This spring is required to work instantaneously, but in so doing it is found that
the end of the knife is withdrawn upwards more quickly than the cloth travels, and
so enlarges the hole or slit in the back, or bends its point. I therefore provide a
buffer which will retard the action of the spring at this moment. I prefer to apply
this buffer in the form of a small air cushion contained in a cylinder the plunger of
which is provided with a rack in gear with a pinion mounted upon the pivot on
which the knife holder turns.
Thus although the knife commences to be withdrawn very rapidly and instantly
at a "fault" this action is gradually retarded by the air cushion and thus the end
of the knife is drawn upwards more slowly and does not increase the slit, or bend
its point.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for Applicant.
COMPLETE SPECIFICATION.
Improvements in the Construction of Knives for Cutting the Pile
of Velvets and other Pile Fabrics.
1 JAMES HOYLE SMITH of 8 Abbey Grove Eccles in the County of Lancaster,
Fustian Cutter, 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 especially to the knives, for cutting the pile of velvets
and other pile fabrics, for which Letters Patent No. 16996 were granted to myself,

page_text: Andrew Goddard, Lloyd Higginbottom and Thomas Mannock dated the 10th day
of December 1887.
My invention is also applicable to other fustian cutting knives of similar
construction.
And the same will he readily understood from the following explanation on
reference to the accompanying sheet of drawings, on which
Fig. 1 is a sectional elevation and Fig. 2 a plan view of so much of a knife of
the above description as is necessary to illustrate my invention as applied thereto.
In the first place I mount a small tail piece a at the end of the trigger or pusher b
by which the knife c is released in case the point passes through the back of the
cloth indicated by the dotted line d.
с
This tail-piece a is pivotted to the trigger or pusher b and projects both in front
and behind its pivot, preferably more at the front than behind as shewn, and it is
so formed that it fits in or on the guide cx and pointed so that the cloth (if the
point of the said guide ex goes through it) cannot get between the trigger and the
guide, but will run up the tail piece a, and move with it, as it is pushed backwards
to release the trigger or pusher b, and not move, as is at present the case, upon the
surface of the guide c*.
As the tail-piece a is continued below and beyond its pivot there is no tendency
for its point to rise from the guide c*.
When the trigger or pusher 6 has released the knife c a spring
latter to be withdrawn from the cloth as usual.
e causes the
This spring e is required to work instantaneously but in so doing it is found that
the end of the knife c is withdrawn upwards more quickly than the cloth travels,
and so enlarges the hole or slit in the back or bends its point. I therefore provide
a buffer which will retard the action of the spring e at this moment. I prefer to
apply this buffer in the form of a small air cushion contained in a cylinder f the
plunger g of which is provided with a rack h in gear with a pinion i, mounted upon
the pivot k, on which the knife holder / turns.
Thus although the knife commences to be withdrawn very rapidly and instantly
at a "fault," this action is gradually retarded by the air cushion, and thus the end
of the knife is drawn upwards more slowly and does not increase the slit or bend
its point.
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. The combination with the trigger or pusher of an automatically released
knife for cutting the pile of pile fabrics of a tail piece pivotted thereto and formed
substantially as and for the purpose herein before described.
2. In an automatically released knife for cutting the pile of pile fabrics the com-
bination with the knife holder and spring for actuating the same, of a buffer for
gradually retarding the withdrawal of the knife substantially as and for the
purpose herein before described.
3. In an automatically released knife for cutting the pile of pile fabrics the
combination of the knife holder l, pivot k, pinion is rack h plunger and air
cylinder and spring e substantially as hereinbefore described and illustrated by
the drawings annexed.
"
Dated this 3rd day of Max 1805
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.