Improvements in Wood, Polishing Machines.
Year: 1889

page_text: Date of Application, 10th Dec., 1889-Accepted, 25th Jan., 1890
COMPLETE SPECIFICATION.
[Communicated from abroad by THE BERLIN MACHINE WORKS, of Belot, in the
· County of Rock, and State of Wisconsin, United States of America.]
Improvements in Wood, Polishing Machines.
I, HENRY HARRIS LAKE, of the firm of Haseltine Lake & Co., Patent Agents,
Southampton Buildings in the County of Middlesex 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 to the mechanism employed for attaching the sand paper to
the cylinder of an abrading or polishing machine.
In the accompaning drawings
Figure 1 is a plan or top view of the abrading cylinder with the improvements
attached.
Figure 2 is a transverse section of the cylinder on the line of Figure 1,
looking in, the direction of the arrow.
Figure 3 is an end view of the cylinder.
Figure 4 is a longitudinal section on the line y, y, Figure 3, looking in the
direction of the arrow; and.
Figure 5. is a partial section of the cylinder showing a modification in the clamping
device.
"
The same letters are employed in all the figures in the designation of identical
parts.
f:
1
The cylinder which carries the sand paper, is a hollow, shell with solid heads B, and
intermediate partition C, which are supported on the shaft D.
The sand paper is applied on the periphery of the cylinder, and in order that the ends.
of the sheet may be effectually, secured; a slot is cut in the periphery in the shell,
heads and partitions, to receive two parallel clamping rollers between which the
ends of the sheet are gripped. In order that sand paper of differing thicknesses may
be conveniently attached the gripping rolls must be adjustable, but it is sufficient if
one of them only is so adjustable. I use one roll journalled in fixed jaws F, and
one journalled in swinging jaws G. This swinging jaw is a lever and may be a lever
of the first order as in Figure 2, or it may be a lever of the second order, as shown
in Figure 5, I regard the arrangement shown in Figure 2, as preferable. This is a
lever of the first order with a pivot or fulcrum between the resistance which is the
movable clamping roller and the power which, in this instance, acts against the lever
at its lower end, the long arm being bent around the shaft and terminating on the
other side of it. These jaws are attached to the heads and partitions, and the movable
ones are simultaneously and equally actuated by mechanism acting upon the end of
the long arm. I prefer that shown in Figures 2 and 4.
H is a rod, having its bearings in the heads and partitions and free to move
longitudinally. This movement is communicated to it by an arm L, clamped or other-
wise fastened to the rods by bolts N, and having through the other end a threaded
hole forming a nut travelling on the parallel threaded rod K, having its journals, in
which it may revolve in bearings formed in one head and one partition. This
rod has exposed square ends to receive a socket wrench, by which it may be
rotated thus giving longitudinal movement to the rod H. The rod H, is provided
with wedge formed keys I, which move with the rod and are arranged to bear
one against the end of each jaw G, and force the movable jaw at the outer, end,
towards the stationary jaw.
Instead of this rod and wedge there may be used a rotating rod and cams ✗, as
shown in Figure 5, or springs may be mounted to press the movable jaw.constantly

page_text: towards the fixed jaw or any other known and convenient mode of simultaneously
applying force to the movable jaws.
In the outer ends of the fixed jaws F, and movable jaws G, I place two parallel
rolls E, geared together at R, having their journals in hearings in the said jaws so
that they may be turned therein. These rolls are made from two cylinders, of
equal diameter, which are cut away so as to leave on each a flat face E¹ extending
however, not quite the entire length of the roll but leaving a short cylindrical
portion of full diameter near the end of the roll at E2. This unreduced portion
forms a gauge to prevent the flattened faces, when placed opposite to one another,
from being brought nearer together than permitted by the full radius of the
cylinder, because if permitted so to approach within that limit the rolls could not
be turned so as to bring their convex surfaces in opposition, to clamp the ends of
the paper.
At that end of the roll the shaft S, is squared to receive a socket
wrench.
At the other end of the rolls I provide on each a spur pinion, the teeth of which
are long enough to permit the adjustment of the rolls to the thickness of the
paper be it thick or thin, the bottom of the teeth being at the radial distance from the
axis of the roll so that they may not approach any nearer at that end than they are
permitted to do at the other by the gauge collars. The collar E2 forms a gauge at one
end of the roll and the pinion one at the other. The rolls are set in the slot U in the
cylinder and they are placed in the line of the periphery of the cylinder at their outer
surfaces. They have grooves cut around them adjoining the heads and partitions
to receive the fixed and movable jaws F and G by which they are held in place
without the latter projecting beyond their surface and so interfering with the
smoothness of the paper.
The operation of the device is as follows:-The sand paper is cut into proper
lengths a little in excess of the circumference of the cylinder A. It is drawn neatly
around the cylinder, and the rolls so set that their flat faces shall be opposed to one
another. The ends of the paper are then passed down between the rolls the space
being sufficient to permit this to be done readily and the paper drawn so as to fit
snugly to the cylinder without wrinkles. Then the wrench on S, is turned and the
rolls revolved so that their convex surfaces are opposed, gripping the paper with a
force regulated by the adjusting wedges, or their equivalent mechanism, and carrying
the ends inward with the continued movement of the rolls, until it is drawn as tightly
as desired around the surface of the cylinder.
T, T, are wooden bars to which the cushioned surface of the cylinder is attached.
It will be observed that I place the rollers in the slot in the shell of the cylinder
which is wide enough to receive them whereby they are within the immediate
reach of the operator and draw the paper but little deflected from the curve of the
cylinder, whereas in prior machines where rollers have been used they have been
placed entirely inside of the cylinder, with a narrow slot in front of them, so that
they were not only out of reach, but, when they did grip the paper, they drew it over
a corner which formed an acute angle.
It will also be observed that both rolls are of the same size and are both flattened
along their entire extent, but the cylinders are not cut away at the ends and thereby
they can never approach so as to contract the open space left between their flattened
faces nearer than the full cylinder surfaces will permit, the latter acting as gauges
or stops to define the minimum approach of the rolls.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondents, I declare that what I claim is
First. The combination of a slotted abrading cylinder A, and a pair of clamping
rolls, arranged immediately within the slot, and near the periphery of the cylinder,
one of said rollers being adjustable to or from the other, substantially as and for the
purpose set forth.

page_text: Second. In combination with the slotted cylinder, rollers arranged in said slot,
bearings or jaws pivoted to the cylinder one of which is adjustable, and mechanism
for adjusting the jaw, substantially as set forth.
Third. The combination of the slotted cylinders, rolls carried on jaws, one of which
is adjustable, adjustable wedges acting on the movable jaws and attached to an
adjustable rod, substantially as set forth.
Fourth. The combination of the slotted cylinder, rolls carried on jaws, one of which
is adjustable, adjustable wedges acting on the movable jaws and attached to an
adjustable rod, substantially as set forth..
Fifth. The combination of the slotted cylinder, rolls carried on jaws, one of which
is adjustable, adjustable wedges attached to an adjustable rod and the arm or nut
attached to said rod and made to travel upon a parallel threaded and rotary rod;
substantially as set forth.
Sixth. In combination with the slotted abrading cylinder and clamping rollers
with flattened faces, mechanism for adjusting one of the rollers transversely to its
axis, and a stop which regulates the minimum approach of flattened surfaces, sub-
stantially as set forth.
Seventh. The gripping rollers formed with corresponding flattened convex surfaces,
along a part of their length only so as to have cylindrical portions at the ends to
prevent their approach to one another when their flattened surfaces are opposed,
substantially as set forth.
Dated thin 10th
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.