Improvements in and relating to Oircular Saws.
Year: 1896

page_text: Date of Application, 31st July, 1896-Accepted, 12th Sept., 1896
COMPLETE SPECIFICATION.
Improvements in and relating to Oircular Saws.
I, GUSTAV WAGNER of Reutlingen, Mechanical Engineer, 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 :-
The present invention relates to an improvement in circular saws, the chief
peculiarity of which consists in that the saw blade can be shifted in the most
simple manner, and at the same time with a continuous feed or advance of the saw
carriage. Furthermore in this machine, the parts which effect the continuous
yielding feed or advance are constructed in the most simple way whereby working
with a machine of this kind is still considerably facilitated.
In the accompanying drawings which illustrate a machine of this kind;
Figure 1 is a view in side elevation, partly in section.
Figure 2 is a cross section thereof.
Figure 3 is a view in end elevation of the head of the saw blade.
Figure 4 is a view in side elevation-partly in section-of a modification of the
continuous feed or advance mechanism and
Figure 5 is a view in end elevation of the reversing mechanism.
Throughout the views similar parts are marked with like letters of reference.
The framing or bed 1 of a machine of this kind is provided with a trough or
basin 2 which is usually filled with water so that the saw blade 3' may run wholly
in the water when the saw is making a vertical or slightly inclined cut, and will
thus be kept cooled, and therefore the circular saw can be capable of running at a
very high speed of revolution under ordinary conditions. The axle 4 which
serves to transmit the motion of the belt pulley 5 to the saw blade, is mounted in
a rectangular carriage 6 which is arranged so as to be capable of being shifted in
a horizontal direction in the casing 7. The carriage 6 is formed in front with a
head 8 which is mounted with a box or sleeve 9 in the carriage 6 in such a manner
as to be capable of rotating about the centre of the shaft 4.
With the help of a screw 10 which is guided in a concentric slot 11 in the
head 8 the head can be rotated about the centre of the axle 4 and can be fixed in
any position, so that therefore the saw blade 3 can be adjusted in any direction
because the saw blade 3 is mounted in the head 8 by means of the axle 12.
Motion is transmitted from the axle 4 to the saw blade by means of the worm 13
and wormwheel 14.
Thus in this manner the saw blade can be adjusted or set at any angle in the
simplest way by slacking the screw 10 and turning the head 8, the whole apparatus
being capable of being shifted along the bed 7 by means of the rectangular
carriage 6.
In the machine illustrated in Figure. 1, the continuous feed or advance is
effected by means of a toothed wheel 15 which is arranged in the frame 1 and
which engages with the lower part of the carriage, said lower part being con-
structed in the form of a toothed rack 16. Externally on the shaft of the toothed
wheel there is mounted a drum or pulley 17 round which is fixed and curled a rope
having on its free end a weight 18 so as to cause the pulley to have a constant
tendency to rotate the toothed wheel and thereby to draw the carriage forward.
The feed or advance is thus continuous and also yielding at the same time."
Figure 4 shows another modification of the continuous yielding feed or
advance.

page_text: The carriage 6 carries on its rear end an arm 19 which is provided with an eye
or bearing 20. This eye 20 is connected with a shaft 21 which is arranged above
the carriage. This shaft is screw-threaded on its forward portion and carries a
nut 22 which rests in a pedestal 23 that may be connected to the part 7 of the
frame 1. The nut 22 is formed on its upper side as a toothed rack into which
gears a toothed sector 24 which is also mounted in the pedestal. The toothed
sector 24 has an arm which carried a weight 25. The action of the weight 25 is
such as to cause the nut 22 to have a constant tendency to move forwards and
therefore to press with its shoulder or collar 22" constantly against the rear side
of the bearing, whilst yet being able to yield in case pressure should be applied
from the opposite direction.
As already stated, the spindle 21 is formed with a screwthread thereby enabling
the spindle to screw to and fro in the nut. The spindle 21 carries on its end, as
shown in Figure 5, a toothed wheel 26 with which engages a pawl 27 that is mounted
eccentrically on the prolonged driving shaft 4 of the machine. This pawl is
provided with a counterweight 28 whereby a continuous rotation of the toothed
wheel 26 and consequently an uninterrupted advance or feed of the shaft 21 is
effected. Since the spindle 21 is capable of rotation in the eye 20 of the arm 19
and is prevented by means of two set collars from moving in the direction of its
length, the arm is compelled to move forwards also and thus to impart a continuous
advance to the carriage 6 with the axle 4 and saw blade 3, whilst the arm
however always allows the saw blade to give way, because the spindle 21 permits
yielding to take place in the direction of its axis.
Having now particularly described and ascertained, in 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 improvements in circular saws, substantially as herein before described
and shown.
(2.) The improvement in circular saws, characterized by the fact that the saw
carriage is made divided or in two parts the rear part which is guided in the
frame being made of prism-shape, whilst the forward part which carries the saw-
blade, is arranged so as to be capable of rotating about the centre of a shaft for
driving the saw blade, said shaft passing through both parts of the carriage, as set
forth..
(3.) In circular saws as specified in Claim 2, the arrangement of a continuous
yielding advance or feed consisting in constructing the lower part of the prism-
shaped carriage in the form of a toothed rack whereby it can be moved forwards
by means of a toothed wheel 15 with the aid of a disc 17 that is weighted with a
weight 18, as hereinbefore described and shown.
(4.) In circular saws as specified in Claim 2, the apparatus for effecting a
continuous yielding advance, comprising a spindle 21, which serves to advance
the saw, the said spindle 21 being held with its nut 22 in a yielding manner by
means of a moving weight 25, whilst an arm 19 connected to the saw carriage 6 i
connected by means of an eye 20 with the spindle 21 and by this means transmit
its motion to the carriage 5, as hereinbefore described and shown.
Dated this 21st dow of July 1896
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Associate Agent.