A Glass Bevelling Machine.
Year: 1895

page_text: Date of Application, 24th Jan., 1895
Complete Specification Left, 23rd Oct., 1895-Accepted, 18th Jan., 1896
wance, ngineer.]
A Glass Bevelling Machine.
J, ERNEST DE PASS, of 78, Fleet Street, in the City of London, Fellow of the
Chartered Institute of Patent Agents, do hereby declare the nature of this
invention to be as follows:-
This invention relates to a new or improved arrangement or system of continuous.
working machine, for bevelling glass, whereby mechanical bevelling is substituted
for the long and costly process now employed.
+
The characteristic features of this machine are (1) that the roughing out of the
bevel is effected by a circular diamond saw, or cutter, cutting the glass parallel to
its edge, and the work being terminated by a series of grinding discs; and (2) that
an arrangement is provided for placing and fixing the glass upon a carriage in
such a position that the edge, which is being worked, is situated in a vertical
plane exactly parallel, to that of the circular saw.
pronounced might be the inequality of thickness of the glass at various points of
Thus, no matter how
the edge, a bevel of uniform width is sure to be obtained.
In carrying out the invention; I arrange the revolving diamond saw, or cutter,
and the grinding and polishing discs on spindles revolving in adjustable head-
stocks on a suitable bed or frame. The said discs are formed of corundum, or
other hard material, and are of gradually increasing fineness for polishing the
roughly bevelled surface left by the revolving cutter.
The glass carriage is mounted to slide on a bed, after the manner of the slide
of a lathe, so that the glass can be moved along with smoothness and certainty
while being acted on by the cutter and discs. The glass carrier or frame is inclined
more or less according to the angle at which the bevel is to be cut.
edge is provided to facilitate the adjustment of the carrier or frame to the proper
A straight
inclination, and is so mounted that it can be quickly raised into position for
effecting the necessary adjustment, and be lowered, or turned back, after, such
adjustment, out of the way, as required.
The adjustable headstocks in which the circular diamond saw and the grinding
discs have their spindles mounted, are secured to their bed or frame by bolts
passing through slots. The said spindles are arranged transversely of the bed,
and each is driven in the opposite direction to its neighbour, by a continuous belt
or band. For this purpose, pulleys are arranged on the spindles and a driving
drum extends longitudinally beneath the bed of the machine, the belt being
crossed for alternate pulleys so as to give the required direction to the discs.
The edges of these latter bear upwardly against the glass, when grinding and
polishing, and the last disc finally polishes the bevel by means of colcothar or
English rouge. By reason of the adjustability of their headstocks, the distance
between these discs can be varied, as required, and they can be readily adjusted
to the plane of the revolving cutter or saw.
The carriage is caused to traverse by means of a longitudinal screw and a half-
nut, the screw being so geared up with the shaft of the driving drum as to impart
the proper rate of movement to the carriage.
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page_text: The glass is supported on the carriage in a frame which can be moved trans-
versely to the bed, by any convenient means. The inclination of the frame is
varied by means of an extensible piece, connected at one end to the carriage and
at the other end to the frame. This extensible piece may conveniently be formed
after the manner of a screw jack, and arranged to be worked by a stationary nut,
rotated by a worm and hand wheel.
To set the glass in position, it is placed in the frame after the proper inclination
has been given thereto, and is allowed to slide gently down against the straight
edge, and is then secured by wedges. The said straight edge is so arranged that,
when raised, its face is exactly in line with those of the saw and grinding discs..
For operating the straight edge, it may be provided with heels or projections
resting on cams capable of being turned so as to move it into position, and to
withdraw it after the adjustment has been effected. The handles for operating
the cams are connected by means of a rod to ensure proper working. By
adjusting the glass with the straight edge the true cutting of the bevel can be
ensured.
.
Two or more machines may be arranged in succession, so that after the glass bas
been bevelled on one edge in the first machine, it can be passed on and bevelled
on its other edge, or edges, in the succeeding machine, or machines.
Dated this 24th day of January 1895.
A Glass Bevelling Machine.
I, ERNEST DE PASS, of 78, Fleet Street, in the City of London, Fellow of the
Chartered Institute of Patent Agents, 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, reference being had
to the accompanying drawings and to the letters and figures marked thereon,
that is to say :-
This invention relates to a new, or improved, arrangement or system of
continuous working machine for bevelling glass, whereby mechanical bevelling is
substituted for the long and costly process now employed.
The characteristics of this machine are, that:
1. The roughing out of the bevil is effected by a circular diamond saw, cutting
the glass parallel to its edge, and the work is finished by a series of grinding
discs.
.
2. That an arrangement is provided for placing and fixing the glass upon a
carriage in such a position that the edge which is being worked is situated in a
vertical plane exactly parallel to that of the circular saw. Thus no matter how
pronounced might be the inequalities of thickness of the glass at various points of
the edge, a bevel of uniform width is sure to be obtained.
The annexed drawings shew a glass bevelling machine constructed according to
the invention, and in which :
Fig. 1 is a longitudinal elevation,
Fig. 2 an end view, and
Fig. 3 a plan.
Figs. 4, 5 and 6 are respectively a longitudinal elevation, an end view, and a
plan of the frame carrying the bearings or headstocks.
This new bevelling machine consists of a frame or bed 1, on which is mounted
a series of bearings or headstocks 2, 2, carrying spindles 3, 3, on the first of
which is a circular saw 4, formed of a copper disc having diamonds on its
periphery, and on the others grinding discs 5, 5, of corundum, or other very hard

page_text: material. The spindles of the grinding discs are arranged in couples parallel to
each other, and are slightly inclined in contrary directions to the longitudinal axis
of the machine, so that only the edges of the grinding discs work and attack the
bevel upwardly, the successive tools (saw and grinding discs) revolving alternately
in contrary directions to each other, as indicated by the arrows in Fig. 1.
The bearings or headstocks are secured on the frame or bed by means of
bolts 6, 6, passing through openings 7, 7, formed in the required position so as to
give to the spindle 3 of the corresponding bearing or headstock, the necessary
obliquity and the oblong form of which allows the distance of each grinding disc
to be varied and suitably adjusted to the vertical plane of the saw.
The spindles 3, 3 receive their rotary motion from an endless band 8, which
passes, in the manner shewn in Fig. 1, round the drum 9 mounted on the shaft 10,
and the tension of which, thus rendered uniform upon all the pulleys, may be
regulated by means of two tension rollers 11 and 12, the former of which is
stationary while the other is capable of adjustment by means of a screw and set
nut. The shaft 10 is driven by the motor, by means of a belt passing over the
pulley 13. It actuates, by means of a worm, a worm wheel keyed upon the lower
end of an inclined transverse shaft 14, the other end of which carries an endless
screw 15 gearing with a worm-wheel 16, mounted upon the shaft 17. This latter
transmits motion to the screw shaft 18 by means of two pinions 20, 21, of equal
size, gearing together.
The various gearings are so proportioned that the angular velocities of the two
shafts 10 and 18 are relatively in the ratio recognised as the most convenient in
practice.
The glass carrying carriage 22 is moved longitudinally upon the two slides of a
bed 23, similar to a lathe bed, and connected to the frame 1 of the bearings_or
headstocks. The said carriage is furnished with any ordinary mechanism for
transverse movement. To effect the rapid return of the glass carrying carriage
when it arrives at the end of its travel, the driving strap of the pulley 13 is shifted
and the strap for rapid return is passed on to the fast pulley of the pair of 'fast
and loose pulleys, shewn to the left of Fig. 1, at the end of the shaft 17. This
fast pulley turns in a contrary direction to the pulley 13 and with a greater speed.
The inclination of the glass holding frame 24 is regulated by a kind of screw
jack 25 (Fig. 2) jointed at one of its ends to the carriage 22, and at the other end
to the glass holding frame 24. To effect this regulation, it is only necessary to
lengthen, or to shorten, the said screw jack by turning the hand-wheel 26 in one or
the other direction, and which, by means of the endless screw 27, actuates the
toothed wheel 28, so fitted as to turn always in the same plane, and the boss of
which serves as a nut to the screw 25 of the jack.
The glass carriage is moved along the bed 23, by the screw shaft 18, and by a
half nut 29 that can be disengaged by lifting it up by means of the cam and crank
arrangement shewn in dotted lines in Fig. 2.
The proper mounting of the glass 30 upon the glass holding frame 24, is ensured
by the employment, (constituting a very important new point) of a straight
edge 31, which is hinged upon a horizontal axis 32 parallel to the working plane
of the saw and grinding discs. This straight edge is provided with spurs or
heels 33, resting upon cams or eccentrics 34, which latter can be turned, by means
of the crank handles 35, 35, united by a connecting rod 36, (Fig. 1,) so as to bring
the straight edge 31 up into position, or to turn it down, and to hold it firmly in
one or other of these positions. This straight edge is so shaped that, when it is
raised, one of its faces, viz., that which is opposite the machine, is situated exactly
in a vertical plane parallel to the plane of working of the saw and the grinding
discs. To mount the glass 30 upon the frame (Fig. 2) it is leaned against it and
allowed to slide smoothly until its lower edge rests all along its length against the
straight edge 31. It is then fixed firmly in the frame 24; by means of bolts and
tightening wedges, and the straight edge 31 is turned back by means of the crank
handles 35 and the cams 34. In this way, one can be certain that when the

page_text: carriage is put in movement by bringing the half nut 29 into engagement with
the screw shaft 18, the plane of sawing of the glass will be exactly parallel to the
edge put into place by the straight edge 31, and hence the bevel will be of uniform
width throughout, the piece of glass taken off having the form of a very long
prism.
The glass is thus sawn in the first instance by the circular diamond saw or
cutter 4, and is then subjected to the action of the corundum grinding discs 5, 5,
which latter, as above stated, turn alternately in contrary directions to one another.
The successive grinding discs are, moreover, of a finer and finer grain, the last one
being sufficiently fine to give the final polish to the bevel by means of colcothar
and jewellers' rouge. In this way, the first grinding disc rough grinds the sawn
surface, the second goes over the lines of the first to improve its work, and so on
up to the last grinding disc which leaves the bevel completely finished.
The general arrangement of the frame or bed 23 of the machine has been devised
with a view to enable several machines to be placed one after the other, so that the
glass, after being bevelled upon one of its sides, can be readily conveyed on to the
succeeding machine which will perform the same operation upon one of the other
sides.
In order to diminish the risk of breaking the glass, it is advantageous to cause
one.half or edge only of the grinding disc to act.
grinding disc is a plane one, by inclining its axis to the longitudinal axis of the bed
This can be effected, when the
of the machine; or, without inclining the axis of the grinding disc so much, by
giving a re-entering conical or concave form to the working face of the grinding
disc; or, by inclining the axis very little, or not at all, and by giving a concave or
conical form to the working face.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I claim is :-
1. A glass bevelling machine, in which the bevel is roughed out by a circular
diamond saw, and finished by grinding discs, and the glass is supported on a
carriage so that the edge to be bevelled is parallel with the saw, a hinged straight
edge being provided to ensure such parallelism, substantially as described.
2. The improved glass bevelling machine having its parts arranged, combined,
and operating substantially as hereinbefore described and as shown in the annexed
drawings.
Dated this 23rd day of October 1895.