Improvements in Saw-sharpening Machines.
Year: 1890

page_text: Date of Application, 7th Jan., 1890-Accepted, 15th Feb., 1890
COMPLETE SPECIFICATION.
Improvements in Saw-sharpening Machines.
I, WILLIAM H. HALLADAY, of 1007 Opera House Block, Chicago, Illinois, United
States of America, 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:-
My invention relates to machines for sharpening either crosscut or rip-saws auto-
matically by means of grinding wheels, and has for its objects, in general, to provide
sundry adjustments and parts whereby the machine is made to operate more easily,
and is less liable to get out of order than similar machines now in use. I attain these
objects by the means illustrated in the accompanying drawings, wherein―
Figure 1 is a plan view with parts broken away.
Figure 2 is a side view.
Figure 3 is a front view.
Figure 4 is a detail of the grinding-wheel table and its tilting mechanism.
Figure 5 is a detail vertical section of the finger-rocking bar.
Figure 6 is a detail of the crank which operates the finger-rocking bar.
Like parts are indicated by the same letter in all the figures.
A is the frame; B a shaft on the rear thereof, driven by any suitable power
E is a shaft
supplying device, carrying the pulley C and the worm-wheel D.
journaled in the frame at right angles to the shaft B, and carrying at one end the
gear F, which engages the worm-wheel, the pinion G and also the cam H, and at the
other end the crank K. The crank is secured to the shaft by a set screw L and
carries a block M adjustably secured to such crank with the screw N and having the
short shaft O on which rotates the roller P. This latter slides in the cavity R on
the finger-rocking bar S which is pivoted to the frame A by the bolt T.
U are sundry apertures to receive the bolt T at varying heights. Secured to said
rocking-bar above by means of the screw bolt V is the open box W. The screw bolt
is journaled in the ends of the box and passes through a screw threaded hole in the
end of the rocking bar S, so that by turning the bolt by the hand-wheel on the end
Pivoted
thereof the position of the box on the rocking-bar may be easily adjusted.
to the box is the finger X.
Y is a piuion which engages the pinion G and is secured on and thus drives the
short shaft Z which is journaled on the frame.
A' is a cam, shaped as shown, and having a groove around its periphery to receive
the pendent lug B' on the arm (which is pivoted at one end to the frame and at the
other end is provided with a series of apertures, whereby it may be pivoted to the
rod D. This rod is provided with the extension connecting device E' and pivoted to
the grinding-wheel arbor-frame G₁ at F¹. In this frame is journaled the grinding
wheel K¹, the arbor frame has an upward arm L' terminating in a short-shaft M
which is vertically journaled in the arm N'. This latter arm rises from the table O'
which is hinged to the frame at P¹ and provided with a roller R' which rides upon
the cam H.
Journaled on the arm N₁ are the pulleys S₁ T¹ and on the arbor back of the
grinding-wheel is secured the pully U¹. Over these pulleys and the pulley C passes
the band V1 which drives the arbor. In the arm N' there is a set screw W¹ which
can be driven in against the short shaft M' to keep the same from rotating.
✗' is the saw secured to the block Y¹ by means of the shaft Z' cone A and locking
key B. The block Y¹ is provided with a shoulder C2 above and the cam D2 below.
To the cam D2 is secured the hand-lever E' whereby the block is locked at any
suitable position to the cross-bar F2. This bar is adjustably secured at G² and H³ to
the frame pieces J' and K². The piece J' is secured to the frame A and the piece, K'

page_text: is provided with the eye I screw-threaded to receive the screw-bolt M which passes
through the screw-threaded eye N2 in the frame and is provided with the hand-
wheel O2 above.
i
In
The use and operation of my invention are as follows; As soon as the shaft B is
set in motion by connecting it with the line-shaft or power supplying device, the
pulley C rotates and drives the belt V₁. This operating upon the pulley U₁ imparts
a rapid rotation to the grinding-wheel K. At the same time the worm-wheel D
engaging the gear F, drives the shaft E thus turning the crank K and carrying the
roller O about in a circle. This roller O slides in a groove or aperture R and causes
the bar S to rock on its pivot T. The loosely-pivoted finger thus plays along the edge
of the saw in its forward motion, engages the tooth thereof and rotates the saw.
its rearward motion it slides over the tooth. The throw of the finger may be adjusted
by rotating the screw bolt V. The pinion G, as the shaft E rotates, engages the
pinion Y and rotates the shaft Z and grooved cam wheel A', thus rocking the
arm Cand reciprocating the rod D¹. The length and character of this latter move-
ment may be varied by adjusting the connection of the arm C¹ and rod D¹ and by
altering the length of the extensible connection E¹. The reciprocation of this bar
rocks the arbor frame in its supporting pivot, and this alternately places the rotating
grinding wheel in the position shown in Figure 1 and the opposite position whereby
the wheel may be used to grind a cross-cut saw.
Should it be desired to use the wheel for grinding a rip-saw, the swinging arbor-
frame is brought into proper position therefor and is then locked by means of the
set-screw W¹. As the shaft E rotates the cam H is carried about thus alternately
raising and lowering the table 0¹ and the arm N' on which the arbor-frame is secured.
Thus the grinding-wheel is alternately raised and lowered. The size of the various
pulleys is such, and the sizes and shapes of the various cams are such, and the several
parts are so adjusted as that the finger first engages a tooth and pushes it forward
until just beneath the grinding-wheel, and then returns to engage the next tooth.
The grinding-wheel then descends, sharpening the short side of the tooth, and as the
finger advances rides up the long side of the next tooth, sharpening the same, and
then, if as shown in. the figures, it is set to grind a crosscut saw, it changes its angle
and descends to sharpen the short side of the tooth.
The grinding-wheel is secured to its arbor at a point directly below the arbor-frame
pivot. The table which supports the arbor and frame is hinged at one side and
supported by the cam on the opposite side of the grinding-wheel. This arrangement
I find to be very important in securing a steady and easy action of the grinding
wheel.
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. In an automatic saw-sharpening machine, the combination of the main frame
with a table hinged on one side of the frame and supported on a rotating cam on the
opposite side and a grinding wheel arbor supported about midway of the frame on the
pivoted table.
2. In an automatic saw-sharpening machine, the combination of the main frame
with a table hinged at one side to the frame and supported toward the other end on a
rotating'cam and a grinding-wheel arbor supported on such table between the cam
and its pivot point by means of a vertical bolt so that the grinding-wheel arbor rises
and falls with the table and may be turned about on its pivot.
3. In an automatic saw-sharpening machine, the combination of the main frame
with a grinding-wheel arbor, a saw-support, and a vertical pivot from which the
grinding-wheel arbor is suspended, the whole being arranged so that the vertical
pivot is directly over the grinding-wheel and the saw when the latter is in position..
4. In an automatic saw-sharpening machine, the combination of the main frame
with a table hinged at one side to such frame and supported at the other on a
rotating cam-wheel, a grinding-wheel arbor supported, as shown, by a vertical pivot

page_text: on the pivoted table; a rod secured to one end of the arbor and attached to a rock-
shaft, and a cam-wheel which rocks said rock-shaft, the whole combined so that the
grinding-wheel is alternately raised and lowered by the motion of the table and is
turned about its vertical pivot by the motion of the rod and rock-shaft.
5. In an automatic saw-sharpening machine, the combination of a pivoted rocking
bar, a feed-finger pivoted to such bar, a rotating shaft provided with a crank, a groove
in the back of said rock-shaft to receive the crank, and a suitable main frame on
which the parts are mounted, so that by the rotating of the rod the shaft is rocked
back and forth on its pivot.
6. In an automatic saw-sharpening machine, the combination of the main frame, a
rocking bar pivoted thereon, a box secured to the upper end of said bar, a feed-finger
pivoted to such box, and a screw bolt which passes through said box on the upper end
of the bar, by turning which the position of the finger on the rock-shaft may be
changed to vary its throw.
7. In an automatic saw-sharpening machine, the combination of the main frame, a
rock bar provided with a series of holes, whereby it may be adjustably pivoted on the
frame, and a finger adjustably secured to the upper end of said rocking bar.
8. In an automatic saw-sharpening machine, the combination of the main frame, a
saw supporting piece thereon, and a block to which the saw is secured, said block
provided above with a groove and below with a cam lever, whereby said block,
together with the saw, may be secured at any desired position on the saw sup-
porting bar.
Dated this 7th day of January 1890.
FREDERIC PRINCE,
1, Quality Court, Chancery Lane, London, Agent for Applicant.