IMPROVE- MENTS IN APPARATUS FOR SHARPENING THE KNIVES OF LOOMS EMPLOYED FOR DOUBLE WOVEN PILED FABRICS
Year: 1885

page_text: DELICATION.
I EDWARD GREAVES of 31 Kirkgate, Bradford in the County of York,
Commission Agent do hereby declare the nature of my invention for "IMPROVE-
MENTS IN APPARATUS FOR SHARPENING THE KNIVES OF LOOMS EMPLOYED FOR
DOUBLE WOVEN PILED FABRICS" and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement :-
My invention relates to improvements in the automatic apparatus employed for
maintaining a sharp edge upon the knife used in separating or cutting the pile of
fabrics woven in double looms.
In order to carry out my invention I employ for each sharpening apparatus two
conical rollers mounted upon spindles, which spindles are placed in the same
vertical plane but are at an angle to one another. The bases or widest parts of
these rollers revolve in close proximity to one another, in such manner that the
angle formed by the tapering sides of the cones corresponds with the bevilled
surface of the knife or with the two sides of the knife; one pair of rollers with each
side of the knife.
The rollers are caused to revolve by means of a cord passing over a pulley
attached to the spindle of one of the rollers, whereby motion is given to one of the
rollers, and such motion is communicated from one roller to another by means of
teeth formed round the bases of both conical rollers, or by mitre wheels attached to
the bases of the rollers, or each roller may be caused to revolve by means of a cord
passing over a pulley, which forms a part of, or is attached to the spindle of each
roller.
The spindles carrying the rollers are mounted upon a moveable carriage which
works horizontally upon a slide at right angles to the line in which the knife
travels for the purpose of cutting the pile.
One pair of sharpening rollers is placed at each side of the loom, and by means
of tappets, or levers, is caused to act upon the top or bottom surfaces of the knife,
as such knife reaches either side of the loom, the rollers upon one side of the loom
acting upon the upper surface of the knife, and the rollers upon the other side of
the loom acting upon the under surface of the knife, and after each such sharpening
process the carriage bearing the sharpening rollers is withdrawn or moved back by
Prica 6d1

page_text: means of the tappets or levers hereinbefore mentioned, in order to allow the knife
to travel across the loom.
. The sharpening process may be arranged to take place at every pick of the loom,
or as frequently as may be desired, by varying the adjustment of the tappets or
levers, which actuate the carriage of the rollers.
By placing the rollers at an angle to one another, which angle corresponds with
the bevilled sides of the knife, I am enabled to maintain a keen, cutting edge upon
that portion of the knife, which is more particularly required to come in contact
with, and sever the pile threads.
In order to enable my invention to be more fully understood, I will proceed to
describe the same with 'reference to the accompanying drawings, in which
Figure 1 represents an elevation of the carriage bearing the sharpening rollers
for acting upon or grinding the under surface of the knife.
Figure 2 an elevation of the carriage bearing the sharpening rollers for acting
upon or grinding the upper surface of the knife.
Figure 3 a plan of the front portion of a loom to which the improved apparatus
for sharpening the knife is applied.
Similar letter refer to similar parts in Figures 1 and 2.
The sharpening rollers are represented at A, and attached to these rollers, or
upon the same spindle are grooved pulleys C, over which the cords E run for the
purpose of driving them.
The ends of the spindles, upon which the rollers revolve have bearings D in the
arms and centre standard of the carriage B, which carriage works in or upon the
slide F which is represented in transverse section.
Where it is more convenient to drive only one of a pair of rollers by means of a
Icord, the bases or broader ends of the conical rollers have teeth formed round
them, and are geared together at G, whereby both rollers are caused to revolve at
the same speed.
The arrangement of rollers represented at Figure 1 is for the purpose of acting
upon the under surface of the knife. The arrangement represented at Figure 2
acts upon the upper side of the knife.
The rollers are by preference covered with leather, to the surface of which emery
or a suitable grinding powder is caused to adhere.
In Figure 3 the side frames of the loom are represented at H, and the cross
slide K, upon which the knife L travels. The guides F are supported by brackets
to the side frames H of the loom, and are for the purpose of receiving the
carriages B to which are attached the conical rollers A.
The bar J supports the fabric, and is immediately beneath that part of such
fabric over which the pile knife passes when severing the pile threads.
Upon the right hand side of Figure 3 the pile knife L is represented as being
ground at its under side, by the rollers A, for which purpose the carriage B,
upon which the rollers are supported, has been brought forward, so as to bring the
rollers under the knife, when such knife reaches the side of the loom.
The carriage receives motion from tappets or levers, and is moved back, along
the slide F, as soon as the sharpening operation has taken place, so as to be clear of
the knife, and allow it to move across the loom.
The carriage B bearing the rollers A is shown at the left hand side of Figure 3
as having been moved back along the slide F, out of the way of the knife.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
.I claim is
1 The employment of conical rollers, which have their spindles placed at an
angle to each other, in the manner described, for the purpose of sharpening the pile
knife employed in looms for double woven fabrics.
2 The employment of pairs of rollers, substantially as described, one pair of such
rollers being placed at each side of the loom.

page_text: 3 The employment of separate pairs of rollers, as described, the spindles of which
are placed at an angle to each other, and the sides of which are at an angle, near
the point of junction, corresponding with the angle of the bevilled sides of the.
knife, one pair of rollers to grind the top side of the knife and the other pair to
grind the bottom side, in the manner and for the purpose substantially as set forth,
or any mere modification thereof.